JPH10325480A - Refrigeration equipment, refrigerant flow compensation bypass valve and temperature expansion valve - Google Patents

Abstract

(57) [Problem] To provide a temperature expansion valve capable of appropriately performing refrigerant flow correction at a low condensing temperature without affecting valve opening characteristics when a condensing temperature is in a steady state. SOLUTION: An opening / closing operation is performed based on an equilibrium relationship between a valve opening direction pressure corresponding to an outlet temperature of an evaporator 9 and a spring load of an opposing spring acting in a valve closing direction to control a circulating refrigerant flow rate, and the evaporator outlet side. In the temperature expansion valve 7 that keeps the degree of superheat of the refrigerant at a predetermined value, the counter spring is set to a setting spring 39 that constantly generates a predetermined spring load, and is sensitive to the refrigerant temperature at the outlet of the condenser. A correction spring 61 made of a shape memory alloy for reducing the spring load is used. When the refrigerant temperature on the outlet side of the condenser decreases, the spring load of the correction spring 61 decreases, and the spring load of the opposing spring decreases accordingly, so that the valve opening amount increases and the amount of refrigerant supplied to the evaporator increases. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating / refrigeration apparatus, a bypass valve for correcting a refrigerant flow rate, and a temperature expansion valve, and more particularly, to controlling a flow rate of a circulating refrigerant in accordance with a temperature load of an evaporator to evaporate. Refrigeration apparatus including a temperature expansion valve of a type that maintains the degree of superheat of the refrigerant at the outlet of the vessel at a predetermined value, and a bypass valve for correcting the flow rate of refrigerant used in the refrigeration apparatus, and a temperature expansion valve, particularly the outlet side of a condenser The refrigerant flow correction when the refrigerant temperature (condensation temperature) is low.

[0002]

2. Description of the Related Art In general, in a refrigerating and refrigerating apparatus, a flow rate of a circulating refrigerant flowing from a condenser to an evaporator is controlled by a temperature expansion valve in accordance with a temperature load of the evaporator. Is maintained at a predetermined value.

[0003] The refrigerant flow rate by the temperature expansion valve is determined by the refrigerant pressure (temperature) on the outlet side of the condenser, which determines the refrigerant pressure difference before and after the temperature expansion valve, and the refrigerant pressure (temperature) on the evaporator inlet (expansion valve outlet) side. And the opening amount of the temperature expansion valve.

[0004] When the condensing temperature decreases, the refrigerant pressure difference before and after the expansion valve becomes small, and the refrigerant state at the inlet side of the expansion valve becomes a gas-liquid two-phase state. In addition, the refrigerant temperature (degree of superheat) at the evaporator outlet side becomes extremely high, and it becomes difficult to control the temperature. As a result, the degree of superheat of the refrigerant sucked into the compressor becomes extremely high, the temperature of the refrigerant discharged from the compressor increases accordingly, and insufficient return of the refrigerating machine oil to the compressor occurs. Destruction may occur.

[0005] Further, when the condensing temperature is lowered, the capacity of the evaporator cannot be secured, thereby reducing the cooling effect and the dehumidifying effect. In addition, since the heat exchange efficiency is reduced due to the freezing of the evaporator, the capacity of the evaporator is reduced. The cooling effect and the dehumidifying effect are also reduced.

[0006] The condensing pressure (temperature) in the refrigerator is basically determined by the heat exchange capacity of the condenser, the load temperature (outside air temperature) and the amount of heat exchanged (refrigerant circulation amount).
There is a refrigerating and refrigerating apparatus that keeps the condensing pressure at a predetermined value by controlling the condensing pressure.

When the condenser is of a water-cooled type, the condensing pressure is determined by the temperature and flow rate of the cooling water. By controlling the flow rate of the cooling water with respect to the pressure, the condensing pressure (temperature) is maintained at the set pressure.

When the condenser is of an air-cooled type, the condensation pressure is determined by the outside air temperature and the air volume of the cooling fan. Therefore, the refrigerant bypass type condensation pressure control valve (HPR) controls the refrigerant flowing through the condenser. The condensing pressure (temperature) is maintained at a set pressure by controlling the flow rate or by controlling the rotation speed of the cooling fan.

However, the above-mentioned condensing pressure control increases the load on the compressor and is a control against energy saving.
In addition, when the temperature is low in winter or the like, particularly at the time of startup, the condensing temperature is low, and a required condensing pressure may not be obtained.

In addition to this, immediately after stopping the compressor,
The condenser on the condenser side, that is, the downstream side of the compressor has high temperature and high pressure, and the refrigerant on the evaporator side, that is, the upstream side of the compressor has low temperature and low pressure. When the supply of the refrigerant from the side to the evaporator side is cut off and the compressor is driven again in the same state, a large load is applied to the compressor due to the pressure difference between the upstream and downstream sides of the compressor,
For example, when a compressor is driven by using the rotation of an engine such as a car air conditioner, there is a possibility that a failure occurs due to the load not only in the compressor but also in a power supply source such as an engine.

In view of the above problems, Japanese Patent Application Laid-Open
In the temperature expansion valve disclosed in Japanese Patent Publication No. 142175, a spring for setting the degree of superheat for urging the valve body in the valve closing direction is formed of a temperature-sensitive shape memory alloy, and the condensation temperature is made of a shape memory alloy. A direct sensing is performed by a spring. When the condensing temperature is low, the superheat degree setting spring pressure is lowered to increase the opening amount of the temperature expansion valve and secure the supply amount of the refrigerant to the evaporator as compared with when the condensing temperature is high. Like that.

As a temperature expansion valve using a shape memory alloy, Japanese Patent Application Laid-Open No. 58-184373 discloses a valve stem made of a shape memory alloy sensitive to a refrigerant temperature, or a shape memory alloy sensitive to a refrigerant temperature. There is shown a temperature expansion valve in which a valve seat member is movably supported by a spring member made of stainless steel and a refrigerant flow control region is expanded in accordance with a refrigerant temperature.

[0013]

Problems to be Solved by the Invention JP-A-60-1421
The temperature expansion valve disclosed in Japanese Patent Publication No. 75 can achieve the intended purpose of increasing the opening amount of the temperature expansion valve when the condensing temperature (pressure) is low, and ensuring the supply of the refrigerant to the evaporator. However, with this thermal expansion valve, it is difficult to design and adjust the shape memory alloy spring to the required characteristics, and this affects the valve opening characteristics of the thermal expansion valve in a steady state (when the condensing pressure is a steady pressure). There is a possibility that the performance of the freezer / refrigerator at all times is reduced. In addition, there is also a problem that the response is too fast because the shape memory alloy spring has a large load difference and the shape memory alloy spring directly contacts the refrigerant on the condenser side.

In the temperature expansion valve disclosed in Japanese Patent Application Laid-Open No. 58-184373, the control characteristics of the refrigerant temperature sensed by a valve stem and a spring member made of a shape memory alloy differ depending on the arrangement position thereof. The rod and the spring member are exclusively sensitive to the refrigerant temperature on the evaporator side, and cannot correct the refrigerant flow rate at low condensing pressure properly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and does not affect the valve opening characteristics of the temperature expansion valve when the condensing temperature is in a steady state. A refrigeration apparatus that appropriately performs flow rate correction and can prevent unnecessary load from being applied when the compressor is driven.
It is an object of the present invention to provide a refrigerant flow rate correction bypass valve and a temperature expansion valve.

[0016]

In order to achieve the above object, a thermal expansion valve according to the first aspect of the present invention operates in a valve opening direction and a valve closing direction corresponding to the outlet temperature of an evaporator. In a temperature expansion valve for controlling the circulating refrigerant flow rate by controlling the circulating refrigerant flow rate in accordance with the equilibrium relationship with the spring load of the opposing spring and maintaining the superheat degree of the refrigerant at the evaporator outlet side at a predetermined value, the opposing spring is always a predetermined spring. It comprises a setting spring that generates a load, and a correction spring made of a shape memory alloy that responds to the refrigerant temperature on the condenser outlet side and reduces the spring load by lowering the refrigerant temperature.

According to a second aspect of the present invention, there is provided a temperature expansion valve according to the first aspect, wherein the correction spring is disposed at a refrigerant inlet of the temperature expansion valve, and a refrigerant temperature at a condenser outlet side. It is responsive to

According to a third aspect of the present invention, in the thermal expansion valve according to the first or second aspect, the correction spring is disposed in a spring chamber formed in a main body housing of the thermal expansion valve. It responds to the refrigerant temperature on the condenser outlet side, which is moderated by the ambient temperature.

A refrigeration apparatus according to a fourth aspect of the present invention is a temperature expansion valve for controlling a circulating refrigerant flow in accordance with a temperature load of an evaporator to maintain a superheat degree of a refrigerant at an evaporator outlet side at a predetermined value. In a refrigeration apparatus having a refrigerant circulation path, a bypass valve for refrigerant flow rate correction is provided in the middle of a bypass passage that bypasses the temperature expansion valve, and the bypass valve for refrigerant flow rate correction is a valve body that opens and closes the bypass passage. And a temperature-sensitive element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the valve when the refrigerant temperature is equal to or lower than a predetermined value.

According to a fifth aspect of the present invention, there is provided the refrigeration apparatus according to the fourth aspect, wherein the temperature sensing element is disposed at a refrigerant inlet of a bypass valve for correcting a refrigerant flow rate, and is provided at a condenser outlet. It is sensitive to the refrigerant temperature on the side.

According to a sixth aspect of the present invention, there is provided a refrigeration apparatus according to the fourth or fifth aspect,
The temperature sensing element is disposed in a spring chamber formed in a main body housing of the bypass valve for refrigerant flow correction, and is responsive to the refrigerant temperature on the condenser outlet side, which is alleviated by the ambient temperature.

A refrigeration apparatus according to a seventh aspect of the present invention is the refrigeration apparatus according to the fourth, fifth or sixth aspect, wherein the temperature-sensitive element is made of a shape memory alloy.

According to the eighth aspect of the present invention, the bypass valve for correcting the refrigerant flow rate controls the circulating refrigerant flow rate in accordance with the temperature load of the evaporator, and maintains the superheat degree of the refrigerant at the evaporator outlet side at a predetermined value. A refrigerant flow rate correction bypass valve used in a refrigeration apparatus having a temperature expansion valve in a refrigerant circulation path, the refrigerant flow rate correction bypass valve is provided in the middle of a bypass passage that bypasses the temperature expansion valve, A valve element that opens and closes the bypass passage, and a temperature-sensitive element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the valve element when the refrigerant temperature is equal to or lower than a predetermined value. is there.

According to a ninth aspect of the present invention, there is provided a bypass valve for correcting a refrigerant flow rate according to the eighth aspect, wherein the temperature sensing element is provided at a refrigerant inlet of the bypass valve for correcting a refrigerant flow rate. And is responsive to the refrigerant temperature at the outlet of the condenser.

According to a tenth aspect of the present invention, there is provided a bypass valve for correcting a refrigerant flow rate according to the eighth or ninth aspect, wherein the temperature sensing element is a main body housing of the bypass valve for correcting a refrigerant flow rate. It is arranged in a spring chamber formed therein and is responsive to the refrigerant temperature at the condenser outlet side, which is alleviated by the ambient temperature.

The bypass valve for refrigerant flow correction according to the invention of claim 11 is the bypass valve for refrigerant flow correction of a refrigeration apparatus according to claim 8, 9 or 10, wherein the temperature-sensitive element is made of a shape memory alloy. Is what is being done.

According to a twelfth aspect of the present invention, there is provided a temperature expansion valve for controlling a flow rate of a circulating refrigerant in accordance with a temperature load of an evaporator to maintain a superheat degree of a refrigerant at an evaporator outlet side at a predetermined value. A temperature expansion valve for bypassing a main valve port for controlling a flow rate of a circulating refrigerant in accordance with a temperature load of an evaporator to connect an inlet port and an outlet port, and the bypass passage. And a temperature sensing element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the bypass valve when the refrigerant temperature is equal to or lower than a predetermined value. .

According to a thirteenth aspect of the present invention, there is provided a temperature expansion valve according to the twelfth aspect, wherein the temperature sensing element is disposed at a refrigerant inlet of the temperature expansion valve, and a refrigerant at a condenser outlet side. It is sensitive to temperature.

According to a fourteenth aspect of the present invention, there is provided a temperature expansion valve according to the twelfth or thirteenth aspect, wherein the temperature sensing element is disposed in a spring chamber formed in a main body housing of the temperature expansion valve. Responsive to the refrigerant temperature on the condenser outlet side, which is alleviated by the ambient temperature.

According to a fifteenth aspect of the present invention, there is provided a temperature expansion valve according to the twelfth, thirteenth, or fourteenth aspect, wherein the thermosensitive element is made of a shape memory alloy.

In the temperature expansion valve according to the first aspect of the invention, when the refrigerant temperature on the outlet side of the condenser decreases, the spring load of the correction spring made of the shape memory alloy decreases, and the spring load of the opposing spring decreases accordingly. By reducing, the amount of valve opening increases and the amount of refrigerant supplied to the evaporator increases.

In the temperature expansion valve according to the second aspect of the present invention, since the correction spring is disposed at the refrigerant inlet of the temperature expansion valve, the correction spring responds to the refrigerant temperature at the outlet of the condenser.

In the temperature expansion valve according to the third aspect of the present invention, since the correction spring is disposed in the spring chamber formed in the main body housing of the temperature expansion valve, the correction spring is condensed by the ambient temperature. Responds to the refrigerant temperature at the outlet of the vessel.

In the refrigeration apparatus according to the fourth aspect of the present invention, when the refrigerant temperature at the outlet of the condenser becomes lower than a predetermined value,
The valve element of the bypass valve for refrigerant flow correction is opened by the temperature sensing element of the bypass valve for refrigerant flow correction, and the refrigerant flows through the bypass passage. Thereby, the circulating refrigerant flow rate such as the refrigerant supply amount to the evaporator increases.

In the refrigeration apparatus according to the fifth aspect of the present invention, the temperature-sensitive element of the bypass valve for correcting the refrigerant flow rate is disposed at the refrigerant inlet of the bypass valve for correcting the refrigerant flow rate. Responds to the refrigerant temperature at the outlet of the condenser.

In the refrigeration apparatus according to the sixth aspect of the present invention, the temperature sensing element of the bypass valve for refrigerant flow correction is disposed in a spring chamber formed in the main body housing of the bypass valve for refrigerant flow correction. The temperature sensitive element responds to the refrigerant temperature at the condenser outlet side, which is alleviated by the ambient temperature.

In the refrigeration apparatus according to the present invention, the temperature sensing element is made of a shape memory alloy, and the refrigerant flow rate correction bypass valve is opened by the temperature sensing shape memory operation using the shape memory alloy.

[0038] In the refrigerant flow rate compensating bypass valve according to the eighth aspect and the temperature expansion valve according to the twelfth aspect, when the refrigerant temperature at the outlet side of the condenser becomes lower than a predetermined value, the temperature is increased. The element opens the valve body of the refrigerant flow correction bypass valve, and the refrigerant flows through the bypass passage. Thereby, the circulating refrigerant flow rate such as the refrigerant supply amount to the evaporator increases.

In the refrigerant flow rate compensating bypass valve according to the ninth aspect of the present invention, the temperature sensitive element is disposed at the refrigerant inlet of the refrigerant flow rate compensating bypass valve. Responds to the refrigerant temperature on the side.

In the refrigerant flow rate compensating bypass valve according to the tenth aspect of the present invention, the temperature sensitive element is disposed in a spring chamber formed in the main body housing of the refrigerant flow rate compensating bypass valve, so that the temperature sensitive element is provided. Responds to the refrigerant temperature on the condenser outlet side, which is moderated by the ambient temperature.

In the refrigerant flow rate compensating bypass valve according to the eleventh aspect and the temperature expansion valve according to the fifteenth aspect, the temperature sensing element is formed of a shape memory alloy, and the temperature sensing shape memory is formed by the shape memory alloy. The valve is opened by the operation.

In the temperature expansion valve according to the thirteenth aspect of the present invention, since the temperature sensing element is disposed at the refrigerant inlet of the temperature expansion valve, the temperature sensing element is sensitive to the refrigerant temperature at the outlet of the condenser. I do.

In the temperature expansion valve according to the fourteenth aspect of the present invention, since the temperature sensing element is disposed in the spring chamber formed in the main body housing of the temperature expansion valve, the temperature sensing element is moderated by the ambient temperature. To the refrigerant temperature at the outlet of the condenser.

[0044]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 shows an embodiment of a refrigeration system including a temperature expansion valve according to the present invention. The refrigeration system has a compressor 1, a condenser (condenser) 3, a receiver 5, a temperature expansion valve 7, and an evaporator (evaporator) 9, like the ordinary refrigeration system. , 15, 17, and 19 are connected in a loop.

The temperature expansion valve 7 has a housing body 21 made of an aluminum alloy or the like. The housing body 21 has an inlet port 23 and an outlet port (expansion chamber) 25, and has a valve port 27 and a valve chamber 29 between the inlet port 23 and the outlet port 25.

The valve chamber 29 is provided with a ball-shaped valve element 31. The valve element 31 is seated on the valve seat 33 to close the valve port 27, and is separated from the valve seat 33 (lift amount). ) Quantitatively controls the valve opening amount (refrigerant flow rate).

In the valve chamber 29, an adjustable spring retainer 35 which is adjustably screwed to the housing body 21.
, A valve body-side spring retainer 37, and a setting spring 39 provided between the adjustable spring retainer 35 and the valve body-side spring retainer 37.

The setting spring 39 is made of a normal spring material and constantly generates a predetermined spring load. Setting spring 39
Is a spring load in the valve-closing direction upward in FIG. 1, and bears a part of the opposing spring load.

Diaphragm cases 41 and 43 are attached to the housing body 21. A diaphragm 45 is stretched in the diaphragm cases 41 and 43,
Pressure chambers 47 and 49 are defined on both upper and lower sides of the diaphragm 45.

The pressure chamber 49 is provided with a piston 51 supported by the housing body 21 so as to be vertically movable and driven by the diaphragm 45. Further, the housing body 21 supports the connecting rod 53 so as to be able to move up and down. The connecting rod 53 transmits the movement of the piston 51 to the valve element 31 and pushes down the valve element 31 against the spring force of the setting spring 39. Thus, the valve element 31 is driven to open.

The pressure chamber 49 communicates with the outlet port 25 through a gap between the piston 51 and the housing body 21, a spring chamber 59, and a hole 22, which will be described later, and receives a refrigerant pressure on the evaporator input side. In order to prevent the inlet port side refrigerant from flowing into the pressure chamber 49 and the spring chamber 59, the sliding portion of the connecting rod 53 is provided with a packing member 20 pre-loaded by the spring 18 attached by the fixed retainer 16. .

The pressure chamber 47 is connected to a temperature-sensitive cylinder 57 attached to the refrigerant pipe 19 by a capillary tube 55. Gas is sealed in the pressure chamber 47, the capillary tube 55, and the temperature-sensitive cylinder 57, and the temperature-sensitive cylinder 57 responds to the temperature of the refrigerant flowing through the refrigerant pipe 19, that is, the temperature on the outlet side of the evaporator 9, and A sealed gas pressure corresponding to the temperature sensed by the temperature sensing cylinder 57 is applied to the pressure chamber 47. The sealing gas pressure applied to the pressure chamber 47 acts on the upper surface of the diaphragm 45, and the diaphragm 45, the piston 51
Acts to push down. The sealing characteristic of the sealing gas pressure is linearly and uniquely determined by the sealing specification.

The housing body 21 has a spring chamber 59 at the inlet port 23 side of the valve port 27, that is, at the refrigerant inlet.
have. The spring chamber 59 has a shape memory alloy (SMA)
Is disposed.

The correction spring 61 acts between the housing body 21 and the piston 51, and acts in a direction to lift the diaphragm 45 via the piston 51. Spring chamber 59
The refrigerant temperature (condensation temperature) Tc at the inlet of the expansion valve, in other words, the refrigerant temperature at the condenser outlet side is transmitted through the housing body 21 by conduction, and the correction spring 61 is sensitive to this temperature. As a result, the correction spring 61 is sensitive to a temperature Tc ′ that is mainly based on the condensing temperature Tc and that takes into account the ambient temperature, from its disposition position.

The correction spring 61 reduces the spring load when the condensing temperature Tc decreases due to the temperature-sensitive shape memory operation of the shape memory alloy.

As a result, as shown in FIG.
Against the spring force (against the spring load), the constant condensing temperature range correction spring 61 acts effectively (e.g., 20 ° C. or higher), the the spring force W ₀ of setting spring 39 and the spring force W ₁ of the correction spring 61 The combined spring force W ₀ + W ₁ , and the degree of superheat in the steady condensation temperature range (at high condensation temperature) is determined by the relationship between the combined spring force W ₀ + W ₁ and the gas pressure corresponding to the temperature of the temperature sensing cylinder 57. Is set to, for example, 4 deg.

The condensing temperature Tc decreases, and accordingly, the temperature Tc 'which is based on the condensing temperature Tc and which takes into account the ambient temperature.
When but decreases, the spring force W ₁ is reduced in the shape memory alloy compensation springs 61, 'the spring force W ₁ of the correction spring 61 by the lowering of progresses W _1' temperature Tc drops to. Against the spring force at this time, the spring force W ₀ of setting spring 39, the combined spring force W ₀ + W of the spring force W ₁ after reduction of the correction spring 61 '
₁ ′, and the reduced load of the opposing spring force acts as a decrease in the set superheat, and the flow rate of the refrigerant supplied to the evaporator 9 of the temperature expansion valve 7 increases.

FIG. 3 shows the relationship between the condensation temperature and the degree of superheat of the refrigerant at the outlet of the evaporator. At low condensing temperature (pressure), the difference in refrigerant pressure before and after the temperature expansion valve 7 is reduced, so that the flow rate of the refrigerant supplied from the temperature expansion valve 7 to the evaporator 9 is insufficient, and the degree of superheat is significantly larger than the set superheat degree. However, as in the case of the temperature expansion valve 7 according to the present invention, when the condensing temperature is low, the flow rate of the refrigerant supplied to the evaporator 9 of the temperature expansion valve 7 increases due to the reduction correction of the opposing spring force by the correction spring 61 made of a shape memory alloy. By doing so, the shortage of the refrigerant flow rate at the time of the low condensation temperature is resolved.

As a result, the superheat degree is prevented from becoming larger than the set superheat degree, a required cooling effect is obtained even at a low condensing temperature, and the compressor 1 is reduced due to a decrease in the amount of circulating refrigerant.
Insufficient return of the refrigerator oil to the compressor 1 is also avoided, and the life of the compressor 1 is ensured.

Moreover, the refrigerant temperature (pressure) on the evaporator 9 side, that is, on the upstream side of the compressor 1, is on the condenser 3 side, that is, on the compressor 1 side.
Even when the compressor 1 is stopped in a state where the temperature is very lower than the refrigerant temperature (pressure) on the downstream side, the flow rate of the refrigerant supplied to the evaporator 9 of the temperature expansion valve 7 is increased by the correction correction of the opposing spring force by the correction spring 61. By doing so, the difference between the refrigerant pressure on the upstream side and the refrigerant pressure on the downstream side of the compressor 1 is reduced, so that a large load is not applied to the compressor 1 at the time of subsequent re-driving, and the life of the compressor 1 is also reduced. Is secured.

[0062] In the temperature expansion valve 7 by the above-described configuration, individually designed spring force W ₁ of the spring force W ₀ and the correction spring 61 of setting spring 39, it is possible to set, with a large degree of freedom, the temperature The function and performance of the expansion valve can be reliably ensured.

The correction value at the time of low condensation temperature can be set and selected as the correction spring 61 alone, and can be designed as a normal temperature expansion valve at the time of steady condensation temperature (at the time of high condensation temperature). Since the performance and characteristics of the valve work as a normal configuration and function, the function of the temperature expansion valve can be exhibited accurately and properly, and there is no special design method and usage method.

In the temperature expansion valve 7 having the above-described structure, the correction spring 61 is mainly composed of the condensing temperature Tc and is sensitive to the temperature Tc 'in consideration of the ambient temperature. In response to the refrigerant temperature Tc, even if the condensing temperature Tc changes abruptly, the temperature Tc 'sensed by the correction spring 61 changes relatively slowly, and the stability of the system is secured.

(Embodiment 2) FIG. 4 shows one embodiment of a refrigerant flow compensation bypass valve and a refrigeration apparatus including the refrigerant flow compensation bypass valve according to the present invention. In FIG. 4, the parts corresponding to FIG.
The same reference numerals are given to the same reference numerals, and the description is omitted.

In the refrigerator according to this embodiment,
A bypass pipe 69 that connects the refrigerant pipes 15 and 17 by bypassing the temperature expansion valve 7 is provided, and a refrigerant flow rate correction bypass valve 71 that opens and closes the bypass pipe 69 is provided in the middle of the bypass pipe 69. Have been.

The refrigerant flow rate compensating bypass valve 71 has a housing body 73 made of an aluminum alloy or the like.

The housing body 73 has an inlet port 75 on the condenser 3 side, an outlet port 77 on the evaporator 9 side, and a valve chamber 79 and a valve port 81 between the inlet port 75 and the outlet port 77. I have.

The valve chamber 79 is provided with a ball-shaped valve element 83. The valve element 83 closes the valve port 81 by sitting on the valve seat 85, and opens the valve port 81 by separating from the valve seat 85.

The housing body 73 includes a sealing member 87.
The spring ring plug 91 is sandwiched by the snap ring 89.
Is mounted airtight. The housing body 73 movably supports the valve stem 93. Spring chamber plug 91 and valve stem 9
3, a bias spring 95 is provided, and the bias spring 95 urges the valve body 83 in a valve closing direction with a weak spring force.

A spring chamber 97 closed by a spring chamber plug 91 is formed on the inlet port 75 side of the housing body 73, that is, on the refrigerant inlet portion. Spring chamber 9
A temperature-sensitive spring (temperature-sensitive element) 99 made of a shape memory alloy (SMA) is arranged at 7. Temperature sensing spring 99
Has its lower end locked to the bottom of the spring chamber 97 and its upper end set to the valve stem 9.
3 is received by the spring retainer 101 and contracts at a high temperature to close the valve element 83, whereas it expands at a low temperature to lift the valve rod 93, and the valve element 83 is lifted.
Is opened.

The temperature-sensitive spring 99 is located in the spring chamber 97. The spring chamber 97 has a refrigerant temperature (condensation temperature) T at the inlet of the expansion valve.
c, in other words, the temperature of the refrigerant at the outlet of the condenser is transmitted through the housing main body 71 by conduction, and the temperature-sensitive spring 99 responds to this temperature.
And is responsive to the temperature Tc 'in consideration of the ambient temperature.

With the above configuration, at the time of high condensation temperature (at a steady state), the temperature sensing spring 99 is in the contracted state and the valve element 83 is closed, so that the refrigerant flow rate in the bypass pipe 69 becomes zero. The flow rate of the circulating refrigerant in the refrigerating and refrigerating apparatus is normally determined by the opening amount of the temperature expansion valve 7.

At the low condensing temperature when the condensing temperature is lowered, the temperature sensing spring 99 is extended and the valve body 83 is opened, so that the refrigerant flows through the bypass pipe 69, and the flow rate of the refrigerant by the amount of the bypass refrigerant at the steady state is reduced. As a result, the flow rate of the circulating refrigerant in the refrigeration apparatus increases.

As a result, the flow rate of the refrigerant supplied to the evaporator 9 increases at a low condensing temperature (pressure), and does not affect the valve opening characteristics of the temperature expansion valve 7 in a steady state. Shortage of the refrigerant flow rate is eliminated.

Even when the valve element 83 opens and the refrigerant flows through the bypass pipe 69 when the condensation temperature is low, the temperature expansion valve 7 controls the superheat degree to a predetermined value by a feedback control method. The superheat degree is maintained at a predetermined value even at the time of the condensing temperature, and the performance of the refrigeration apparatus is maintained throughout the year.

The temperature sensing spring 99 is mainly based on the condensation temperature Tc and is sensitive to the temperature Tc 'in consideration of the ambient temperature. Therefore, the temperature sensitive spring 99 is sensitive to the refrigerant temperature Tc at the outlet of the condenser, which is alleviated by the ambient temperature. Even if the condensing temperature Tc changes suddenly, the temperature Tc 'sensed by the temperature-sensitive spring 99 changes relatively slowly, and the stability of the system is secured.

The opening and closing characteristics of the bypass valve 71 for correcting the refrigerant flow rate can be set and selected as a single spring by the temperature characteristic of the temperature-sensitive spring 99 made of a shape memory alloy. The setting of the correction characteristic can be easily, accurately and appropriately performed independently of the function and the characteristic setting of the temperature expansion valve 7.

The temperature expansion valve 7 can be designed as a normal temperature expansion valve, and the performance and characteristics of the temperature expansion valve work as a normal configuration and function. There is no need for simple design and usage.

(Embodiment 3) FIG. 5 shows another embodiment of the refrigeration apparatus including the refrigerant flow rate correcting bypass valve and the refrigerant flow rate correcting bypass valve according to the present invention. In FIG. 5, portions corresponding to those in FIG. 4 are denoted by the same reference numerals as those in FIG. 4, and description thereof will be omitted.

In the refrigeration apparatus according to this embodiment,
A bypass pipe 69 that connects the refrigerant pipes 15 and 17 by bypassing the temperature expansion valve 7 is provided. In the middle of the bypass pipe 69, a refrigerant flow rate correction bypass valve 71A that opens and closes the bypass pipe 69 is provided. Have been.

The refrigerant flow rate compensating bypass valve 71A has a housing body 73A made of an aluminum alloy or the like.

The housing body 73A has an inlet port 75A on the condenser 3 side, an outlet port 77A on the evaporator 9 side,
A valve chamber 79 is provided between the inlet port 75A and the outlet port 77A.
A and a valve port 81A.

The valve chamber 79A is provided with a ball-shaped valve element 83A. The valve element 83A closes the valve port 81A by sitting on the valve seat 85A, and opens the valve port 81A by separating from the valve seat 85A.

A spring chamber cap 91A is hermetically screwed to the housing body 73A with a seal member 87A interposed therebetween. The housing body 73A movably supports the valve rod 93A.

Input port 75A of housing body 73A
On the side, that is, at the refrigerant inlet, the spring chamber cap 9
A spring chamber 97A closed by 1A is formed. A bias spring 95A is disposed in the spring chamber 97A. The bias spring 95A has a lower end locked to the bottom of the spring chamber 97A, an upper end received by a spring retainer 101A fixed to the valve rod 93A, and urges the valve body 83A in a valve opening direction with a weak spring force.

The spring chamber cap 91A and the valve rod 93
A temperature-sensitive spring (temperature-sensitive element) made of a shape memory alloy (SMA) is provided between the retainer 103A and the retainer 103A.
99A is arranged. The temperature sensing spring 99A has its lower end locked by a retainer 103A extending to the bottom side of the spring chamber 97, and has its upper end received by the spring chamber cap 91A, and extends at high temperatures to close the valve body 83A. On the other hand, at the time of low temperature, the valve rod 93A is contracted, the valve rod 93A is lifted by the urging force of the bias spring 95A, and the valve element 83A is opened.

The spring chamber 97A communicates with the valve chamber 79A through a communication hole 98A. The spring chamber 97A has a refrigerant temperature (condensation temperature) Tc at the inlet of the expansion valve, in other words, a condenser outlet side. Since the temperature of the refrigerant flows in and the temperature-sensitive spring 99A responds to this temperature, the temperature-sensitive spring 99A mainly responds to the temperature Tc 'including the condensation temperature Tc and the ambient temperature.

With the above configuration, at the time of high condensation temperature (at a steady state), the temperature-sensitive spring 99A is in the extended state and the valve element 83
Since A is closed, the flow rate of the refrigerant in the bypass pipe 69 becomes zero, and the flow rate of the circulating refrigerant in the refrigeration unit is determined as usual by the opening amount of the temperature expansion valve 7.

When the condensation temperature is low and the condensation temperature is low, the temperature-sensitive spring 99A is contracted and the valve element 83A is opened, so that the refrigerant flows through the bypass pipe 69. As a result, the flow rate of the circulating refrigerant in the refrigeration apparatus increases.

As a result, the flow rate of the refrigerant supplied to the evaporator 9 increases at a low condensing temperature (pressure), and does not affect the valve opening characteristics of the temperature expansion valve 7 in a steady state. Shortage of the refrigerant flow rate is eliminated.

Even if the valve element 83A opens and the refrigerant flows through the bypass pipe 69 when the condensation temperature is low, the temperature expansion valve 7 controls the superheat degree to a predetermined value by the feedback control method. The superheat degree is maintained at a predetermined value even at the time of the condensing temperature, and the performance of the refrigeration apparatus is maintained throughout the year.

The temperature-sensitive spring 99A is mainly based on the condensing temperature Tc, and is sensitive to the temperature Tc 'in consideration of the ambient temperature. Therefore, the temperature-sensitive spring 99A is sensitive to the refrigerant temperature Tc at the condenser outlet side which is moderated by the ambient temperature. Even if the condensing temperature Tc suddenly changes, the temperature Tc 'sensed by the temperature sensing spring 99A changes relatively slowly, and the stability of the system is secured.

The open / close characteristics of the bypass valve 71A for correcting the refrigerant flow rate can be set and selected as a single spring by the temperature characteristic of the temperature-sensitive spring 99A made of a shape memory alloy. The setting of the correction characteristic can be easily, accurately and appropriately performed independently of the function and the characteristic setting of the temperature expansion valve 7.

The temperature expansion valve 7 can be designed as a normal temperature expansion valve, and the performance and characteristics of the temperature expansion valve work as a normal configuration and function. There is no need for simple design and usage.

In the second and third embodiments, the connection on the outlet side of the bypass pipe 69 is made according to the required characteristics and the like, as shown by reference numeral 69a in FIGS.
The design can be easily changed to an intermediate portion of the evaporator 9 and an outlet portion of the evaporator 9 as shown by reference numeral 69b in FIGS.

In the refrigeration systems of the first to third embodiments, the bypass valve for correcting the refrigerant flow rate is provided inside the single temperature expansion valve, or the bypass valve itself is formed as a single unit. , There are no restrictions on their size, and the correction spring 61 and the temperature-sensitive springs 99, 99 are correspondingly limited.
A can be increased to improve the reproducibility of temperature deformation,
For this reason, it can be said that it is relatively suitable to be used when high refrigeration capacity is required, such as a large prefabricated refrigerator or a large ship refrigerator.

(Embodiment 4) FIGS. 6 to 8 show another embodiment of a refrigeration apparatus including a temperature expansion valve according to the present invention. 6 to 8, the portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description thereof is omitted.

The temperature expansion valve 7 is mounted on the housing body 21.
It has a through refrigerant passage 24 which forms a part of a refrigerant passage from the evaporator 9 to the compressor 1, and refrigerant pipes 19 a and 19 b are connected to both sides of the through refrigerant passage 24.

In the diaphragm case 43, a gas that is the same as the refrigerant flowing through the refrigerant circuit of the freezing and refrigeration apparatus or that corresponds to the refrigerant flowing through the refrigerant circuit is used to fill the pressure chamber 47 above the diaphragm 45. The sealing tube 57 'is attached to the pressure chamber 47 of the refrigerant.
Sealed after encapsulation. The internal pressure of the pressure chamber 47 is increased by the valve rod 53 extending across the through refrigerant passage 24 and the evaporator 9 flowing through the through refrigerant passage 24, as in the conventional case.
And transmitted to the pressure chamber 47 through the retainer 51 ′ and the diaphragm 45 from the valve rod 53.
It changes according to the refrigerant temperature at the outlet side of the evaporator 9.

The pressure chamber 49 below the diaphragm 45 is
The hole 54 communicates with the through refrigerant passage 24, and exerts a refrigerant pressure on the outlet side of the evaporator 9.

With the above-described structure (normal configuration), the valve element 31
Is the valve opening force due to the differential pressure between the pressure chamber 47 and the pressure chamber 49,
The valve opening amount is set based on an equilibrium relationship with the valve closing force by the setting spring 39. Accordingly, the temperature expansion valve 7 is set to the valve opening amount corresponding to the temperature load of the evaporator 9 and controls the flow rate of the circulating refrigerant according to the temperature load of the evaporator 9 as in the conventional case. And maintain the superheat at the specified value.

The housing main body 21 is formed with a bypass passage 111 which connects the inlet port 23 and the outlet port 25 by bypassing the valve port 27. The bypass passage 111 is connected to the inlet port 23 by the bypass passage inlet 111a. It is open to the outlet port 25 by the bypass passage outlet 111b.

The housing body 21 has a bypass passage 1
A bypass chamber 113 is formed at a position corresponding to the middle of 11. The bypass chamber 113 is sealed by a cover 119 airtightly attached to the housing body 21 by a snap ring 117 with the seal member 115 interposed therebetween.

A ball-shaped bypass valve body 121 is provided on the bypass passage inlet 111a side. The bypass valve element 121 closes the bypass valve port 125 formed between the bypass passage inlet 111a and the bypass passage outlet 111b by seating on the valve seat 123, and separates from the valve seat 123 to bypass the valve. Port 125
open.

The housing body 21 includes the seal member 12
7, the spring chamber plug 131 is airtightly mounted by a snap ring 129. Housing body 2
1 movably supports the valve stem 133.

A spring chamber 135 closed by a spring chamber plug 131 is formed on the input port 23 side of the housing body 21, that is, on the refrigerant inlet. A temperature-sensitive spring (temperature-sensitive element) 137 made of a shape memory alloy (SMA) is arranged in the spring chamber 135. The temperature-sensitive spring 137 has a lower end locked to the bottom of the spring chamber 135 and an upper end received by a spring retainer 139 fixed to the valve rod 133.
1 is closed, while the valve stem 1
33 is pulled to open the bypass valve body 123.

The temperature sensing spring 137 is located in the spring chamber 135,
The refrigerant temperature (condensation temperature) Tc at the inlet of the expansion valve, in other words, the refrigerant temperature at the condenser outlet side is transmitted to the spring chamber 135 through the housing body 21 by conduction, and the temperature-sensitive spring 1
37 responds to this temperature, the temperature-sensitive spring 137 is mainly composed of the condensing temperature Tc and the temperature T taking into consideration the ambient temperature.
Responds to c '.

With the above configuration, at the time of high condensation temperature (at a steady state), the temperature sensing spring 137 is in a contracted state and the bypass valve body 121 is closed, so that the refrigerant flow rate in the bypass passage 111 is zero. The flow rate of the circulating refrigerant in the refrigerating and refrigerating apparatus is normally determined by the opening amount of the temperature expansion valve 7.

When the condensation temperature is low and the condensation temperature is low, the temperature-sensitive spring 137 expands and the bypass valve body 121 opens, so that the refrigerant flows through the bypass passage 111,
The amount of the circulating refrigerant in the refrigerating / refrigerating apparatus is increased by the amount of the bypass refrigerant (see FIG. 9).

As a result, the flow rate of the refrigerant supplied to the evaporator 9 increases at a low condensing temperature (pressure), and does not affect the valve opening characteristics of the temperature expansion valve 7 in a steady state. Shortage of the refrigerant flow rate is eliminated.

The temperature-sensitive spring 137 is mainly made of the condensing temperature Tc, and is sensitive to the temperature Tc 'in consideration of the ambient temperature. Therefore, the temperature-sensitive spring 137 is sensitive to the refrigerant temperature Tc on the condenser outlet side which is moderated by the ambient temperature. Even if the condensing temperature Tc suddenly changes, the temperature Tc 'sensed by the temperature sensing spring 137 changes relatively slowly, and the stability of the system is secured.

Even when the bypass valve body 121 opens and the refrigerant flows through the bypass passage 111 when the condensation temperature is low, the temperature expansion valve 7 controls the superheat degree shown in FIG. Therefore, the superheat degree is maintained at a predetermined value even at the time of low condensing temperature, and the performance of the refrigerator is maintained throughout the year.

The opening and closing characteristics of the bypass valve element 121 can be set and selected as a single spring by the temperature characteristics of the temperature-sensitive spring 137 made of a shape memory alloy.
The setting of the refrigerant flow correction characteristic at the time of the low condensation temperature can be easily, accurately, and appropriately performed independently of the function and the characteristic setting of the temperature expansion valve 7.

Also in this case, the temperature expansion valve 7 can be designed as a normal temperature expansion valve, and the performance and characteristics of the temperature expansion valve function as a normal configuration and function. It can be used without any special design or usage.

Further, the bypass valve structure including the bypass passage 111, the bypass valve body 121, the valve rod 133, the temperature sensing spring 137 and the like is incorporated in the housing 21 together with the through refrigerant passage 24 and the temperature expansion valve 7, so that the mounting is possible. sex,
It can be said that the refrigerating / refrigerating system of this embodiment has a good space, and is relatively suitable for use when there is a restriction in a mounting space such as a car air conditioner.

The temperature-sensitive springs 99 and 137 in the second and fourth embodiments can be made of a material that is reversibly deformed by temperature, such as a bimetal, and the shape is limited to a coil spring. Instead, it may be a leaf spring or the like.

[0118]

As will be understood from the above description, according to the thermal expansion valve according to the first aspect of the present invention, the pressure in the valve opening direction corresponding to the outlet temperature of the evaporator and the opposition in the valve closing direction act. In a temperature expansion valve that controls the circulating refrigerant flow rate by controlling the circulation refrigerant flow rate by controlling the balance of the spring load of the spring and the evaporator outlet side refrigerant at a predetermined value, the counter spring always applies a predetermined spring load. The configuration spring includes a setting spring that is generated and a correction spring made of a shape memory alloy that is sensitive to the refrigerant temperature on the condenser outlet side and reduces the spring load by lowering the refrigerant temperature.

Therefore, when the refrigerant temperature on the outlet side of the condenser decreases, the spring load of the correction spring made of a shape memory alloy decreases, and the spring load of the opposing spring decreases accordingly. Since the amount of refrigerant supplied to the evaporator increases, the flow rate of the circulating refrigerant increases at low condensing temperature without affecting the valve opening characteristics of the temperature expansion valve when the condensing temperature is in a steady state. Insufficient refrigerant supply is resolved, required cooling and dehumidifying effects are obtained even at low condensing pressure, and shortage of refrigerator oil return to the compressor is also avoided, ensuring the life of the compressor. it can.

Further, when the compressor is stopped in a state where the refrigerant temperature (pressure) on the evaporator side, that is, on the upstream side of the compressor, is much lower than the refrigerant temperature (pressure) on the condenser side, that is, on the downstream side of the compressor. However, since the flow rate of the refrigerant supplied to the evaporator of the temperature expansion valve increases due to the reduction correction of the opposing spring force by the correction spring, the difference between the refrigerant pressure on the upstream side and the downstream side of the compressor is alleviated. It is also possible to prevent a large load from being applied to the compressor at the time of re-driving, whereby the life of the compressor can be ensured.

According to the temperature expansion valve according to the second aspect of the present invention, in the temperature expansion valve according to the first aspect, the correction spring is disposed at a refrigerant inlet of the temperature expansion valve, and is provided at a condenser outlet side. Responsive to the refrigerant temperature.

For this reason, since the correction spring is arranged at the refrigerant inlet of the temperature expansion valve, the correction spring is always sensitive to the refrigerant temperature at the outlet of the condenser, and the supply refrigerant amount correction at the time of low condensation temperature is surely performed. Done in

According to a third aspect of the present invention, in the thermal expansion valve according to the first or second aspect, the correction spring is disposed in a spring chamber formed in a main body housing of the thermal expansion valve. Thus, it is made to respond to the refrigerant temperature on the condenser outlet side, which is alleviated by the ambient temperature.

For this reason, since the correction spring is disposed in the spring chamber formed in the main body housing of the temperature expansion valve, the correction spring is sensitive to the refrigerant temperature on the condenser outlet side which is moderated by the ambient temperature. Even if the condensing temperature changes suddenly, the temperature sensed by the correction spring changes relatively slowly, and the stability of the system can be ensured.

According to the refrigeration apparatus of the present invention, when the refrigerant temperature on the outlet side of the condenser becomes equal to or lower than the predetermined value, the temperature-sensitive element of the bypass valve for correcting the flow rate of the refrigerant causes the bypass valve for the refrigerant flow rate to be corrected. Since the valve element opens and the refrigerant flows through the bypass passage, the circulating refrigerant flow rate increases at a low condensing temperature without affecting the valve opening characteristics of the temperature expansion valve when the condensing temperature is in a steady state. In addition, the shortage of refrigerant supply to the evaporator is eliminated, the required cooling and dehumidifying effects are obtained even at low condensing pressure, and the shortage of the refrigerator oil returned to the compressor is also avoided. Can be secured.

According to the fifth aspect of the present invention, the flow rate of the circulating refrigerant is controlled in accordance with the temperature load of the evaporator, and the temperature at which the superheat degree of the refrigerant at the evaporator outlet side is maintained at a predetermined value. In a refrigeration apparatus having an expansion valve in a refrigerant circulation path, a refrigerant flow rate correction bypass valve is provided in the middle of a bypass passage that bypasses the temperature expansion valve, and the refrigerant flow rate correction bypass valve opens and closes the bypass passage. It has a valve element and a temperature-sensitive element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the valve element when the refrigerant temperature is equal to or lower than a predetermined value.

For this reason, the temperature sensing element of the refrigerant flow rate correction bypass valve is disposed at the refrigerant inlet of the refrigerant flow rate correction bypass valve, so that the temperature sensing element always responds to the refrigerant temperature at the condenser outlet side. In addition, the supply refrigerant amount correction at the time of the low condensation temperature is reliably performed.

According to the refrigeration apparatus of the present invention, in the refrigeration apparatus of the fourth or fifth aspect, the temperature sensing element is formed in a main body housing of a bypass valve for correcting a refrigerant flow rate. In the spring chamber, and responds to the refrigerant temperature on the condenser outlet side, which is alleviated by the ambient temperature.

For this reason, the temperature sensing element of the bypass valve for refrigerant flow compensation is arranged in the spring chamber formed in the main housing of the bypass valve for refrigerant flow compensation, so that the temperature sensing element is alleviated by the ambient temperature. Because it responds to the refrigerant temperature at the condenser outlet side, even if the condensing temperature changes suddenly,
The temperature sensed by the correction spring changes relatively slowly, and the stability of the system can be ensured.

According to the refrigeration apparatus according to the seventh aspect of the present invention, in the refrigeration apparatus according to the fourth, fifth or sixth aspect, the temperature sensitive element is made of a shape memory alloy.

For this reason, the temperature sensing element is made of a shape memory alloy, and the bypass valve for correcting the refrigerant flow rate is opened by the temperature sensing shape memory operation using the shape memory alloy. Correction of the supply refrigerant amount at the time of the low condensation temperature is reliably performed.

According to the refrigerant flow rate compensating bypass valve according to the eighth aspect of the invention, the circulating refrigerant flow rate is controlled in accordance with the temperature load of the evaporator, and the superheat degree of the refrigerant at the evaporator outlet side is set to a predetermined value. A refrigerant flow rate correction bypass valve used in a refrigeration apparatus having a temperature expansion valve in the refrigerant circulation path, wherein the refrigerant flow rate correction bypass valve is provided in the middle of a bypass passage that bypasses the temperature expansion valve. A valve element for opening and closing the bypass passage, and a temperature sensing element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the valve element when the refrigerant temperature is equal to or lower than a predetermined value. It was taken.

When the temperature of the refrigerant at the outlet of the condenser becomes equal to or lower than a predetermined value, the valve element of the bypass valve for correcting the refrigerant flow rate is opened by the temperature sensing element, and the refrigerant flows through the bypass passage. Without affecting the valve opening characteristics of the temperature expansion valve when the temperature is in a steady state, the flow rate of the circulating refrigerant increases at low condensing temperatures, eliminating the shortage of refrigerant supply to the evaporator. Cooling and dehumidifying effects,
In addition, it is possible to prevent the refrigerating machine oil from being insufficiently returned to the compressor, thereby ensuring the life of the compressor.

According to the refrigerant flow rate correcting bypass valve of the ninth aspect, in the refrigerant flow rate correcting bypass valve of the eighth aspect, the temperature sensing element is provided at a refrigerant inlet of the refrigerant flow rate correcting bypass valve. And was responsive to the refrigerant temperature on the condenser outlet side.

For this reason, since the temperature sensing element is arranged at the refrigerant inlet of the bypass valve for correcting the refrigerant flow rate, the temperature sensing element always responds to the refrigerant temperature at the condenser outlet side, and the supply at the time of the low condensation temperature is performed. Refrigerant amount correction is performed reliably.

According to the bypass valve for correcting a refrigerant flow according to the invention of claim 10, in the bypass valve for correcting the refrigerant flow according to claim 8 or 9, the temperature-sensitive element is the same as that of the bypass valve for correcting the refrigerant flow. It is arranged in a spring chamber formed in the main body housing, and is responsive to the refrigerant temperature on the condenser outlet side which is moderated by the ambient temperature.

For this reason, since the temperature-sensitive element is disposed in the spring chamber formed in the main body housing of the bypass valve for refrigerant flow correction, the temperature-sensitive element is cooled at the outlet of the condenser by the ambient temperature. Because it responds to temperature,
Even if the condensing temperature changes suddenly, the temperature sensed by the correction spring changes relatively slowly, and the stability of the system can be ensured.

According to the refrigerant flow rate correcting bypass valve according to the eleventh aspect of the present invention, in the refrigeration apparatus refrigerant flow rate correcting bypass valve according to the eighth, ninth or tenth aspect,
The temperature sensing element was made of a shape memory alloy.

For this reason, the temperature sensing element is made of a shape memory alloy, and the valve is opened by the temperature sensing shape memory operation by the shape memory alloy. The amount correction is performed reliably.

According to the temperature expansion valve of the twelfth aspect, the refrigeration system controls the circulating refrigerant flow rate in accordance with the temperature load of the evaporator, and maintains the superheat degree of the refrigerant at the evaporator outlet side at a predetermined value. In a temperature expansion valve for a refrigeration device, a bypass passage for communicating and connecting an inlet port and an outlet port by bypassing a main valve port portion for controlling a circulating refrigerant flow rate in accordance with a temperature load of an evaporator, A bypass valve that opens and closes a bypass passage, and a temperature-sensitive element that is responsive to the refrigerant temperature on the outlet side of the condenser and opens the bypass valve when the refrigerant temperature is equal to or lower than a predetermined value. And

Therefore, when the temperature of the refrigerant at the outlet side of the condenser is equal to or lower than a predetermined value, the valve element of the refrigerant flow rate correction bypass valve is opened by the temperature sensing element, and the refrigerant flows through the bypass passage. Therefore, at low condensing temperature, the circulating refrigerant flow rate increases and the shortage of refrigerant supply to the evaporator is eliminated without affecting the valve opening characteristics of the temperature expansion valve when the condensing temperature is in a steady state. Even at the time, required cooling and dehumidifying effects can be obtained, and insufficient return of the refrigerator oil to the compressor can be avoided, and the life of the compressor can be ensured.

According to a thirteenth aspect of the present invention, in the temperature expansion valve according to the twelfth aspect, the temperature sensing element is disposed at a refrigerant inlet of the temperature expansion valve, and is provided at a condenser outlet side. Responsive to the refrigerant temperature.

For this reason, since the temperature sensing element is arranged at the refrigerant inlet of the temperature expansion valve, the temperature sensing element always responds to the refrigerant temperature at the condenser outlet side, and the supply refrigerant amount correction at the time of low condensation temperature. Is performed reliably.

According to the temperature expansion valve of the invention described in claim 14, in the temperature expansion valve according to claim 12 or 13, the temperature sensing element is provided in a spring chamber formed in a main body housing of the temperature expansion valve. It is arranged to respond to the refrigerant temperature on the condenser outlet side, which is moderated by the ambient temperature.

For this reason, the temperature sensing element of the bypass valve for refrigerant flow rate correction is arranged in the spring chamber formed in the main body housing of the bypass valve for refrigerant flow rate correction, so that the temperature sensitive element is alleviated by the ambient temperature. Because it responds to the refrigerant temperature at the condenser outlet side, even if the condensing temperature changes suddenly,
The temperature sensed by the correction spring changes relatively slowly, and the stability of the system can be ensured.

According to the thermal expansion valve of the present invention described in claim 15, in the thermal expansion valve of claim 12, 13, or 14, the temperature sensing element is made of a shape memory alloy.

Therefore, the temperature-sensitive element is formed of a shape memory alloy, and the bypass valve for refrigerant flow rate correction is opened by the temperature-sensitive shape memory operation by the shape memory alloy. Correction of the supply refrigerant amount at the time of the low condensation temperature is reliably performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing one embodiment of a temperature expansion valve and a refrigeration apparatus including the temperature expansion valve according to the present invention.

FIG. 2 shows the condensation temperature in the thermal expansion valve according to the present invention.
It is a graph which shows an opposing spring characteristic.

FIG. 3 is a graph showing a relationship between a condensing temperature of a refrigerant and an operation superheat degree.

FIG. 4 is a system configuration diagram showing one embodiment of a refrigeration apparatus including a refrigerant flow rate correction bypass valve and a refrigerant flow rate correction bypass valve temperature expansion valve according to the present invention.

FIG. 5 is a system configuration diagram showing another embodiment of the refrigeration apparatus including the refrigerant flow rate correction bypass valve and the refrigerant flow rate correction bypass valve temperature expansion valve according to the present invention.

FIG. 6 is a system configuration diagram showing another embodiment of the temperature expansion valve and the refrigeration apparatus including the temperature expansion valve according to the present invention.

FIG. 7 is a side view of the temperature expansion valve shown in FIG. 6;

FIG. 8 is a sectional view taken along line AA of FIG. 6;

FIG. 9 is a graph showing a relationship between a refrigerant condensing temperature and a degree of superheating, and a relationship between a refrigerant condensing temperature and a bypass refrigerant flow rate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Condenser 5 Condenser 7 Temperature expansion valve 9 Evaporator 21, 73, 73A Housing main body 23, 75, 75A Inlet port 24 Through refrigerant passage 25, 77, 77A Outlet port 27, 79, 79A Valve chamber 29, 81 , 81A Valve port 31, 83, 83A Valve body 39 Setting spring 45 Diaphragm 47, 49 Pressure chamber 57 Temperature sensing cylinder 59, 97, 135 Spring chamber 61 Correction spring 69 Bypass pipe 71, 71A Refrigerant flow rate bypass valve 93, 93A Valve stem 99, 99A, 137 Temperature sensitive spring 111 Bypass passage 121 Bypass valve body 125 Bypass valve port

Claims (15)

[Claims] An opening / closing operation is performed based on an equilibrium relationship between a pressure in an opening direction corresponding to an outlet temperature of an evaporator and a spring load of an opposing spring acting in a valve closing direction to control a circulating refrigerant flow rate. In the temperature expansion valve for maintaining the degree of superheat of the refrigerant at a predetermined value, the counter spring is a setting spring which constantly generates a predetermined spring load, and a spring load which is responsive to the refrigerant temperature on the condenser outlet side and decreases in the refrigerant temperature. And a compensating spring made of a shape memory alloy for reducing the temperature. 2. The temperature expansion valve according to claim 1, wherein the correction spring is disposed at a refrigerant inlet of the temperature expansion valve, and is responsive to a refrigerant temperature at a condenser outlet side. 3. The condenser spring according to claim 1, wherein the compensating spring is disposed in a spring chamber formed in a main body housing of the thermal expansion valve, and is responsive to a refrigerant temperature at a condenser outlet side, which is alleviated by an ambient temperature. Or the temperature expansion valve according to 2. 4. A refrigerating and refrigerating apparatus having a temperature expansion valve in a refrigerant circulation path for controlling a circulating refrigerant flow rate in accordance with a temperature load of an evaporator and maintaining a superheat degree of a refrigerant at an evaporator outlet side at a predetermined value. A refrigerant flow correction bypass valve is provided in the middle of a bypass passage that bypasses the temperature expansion valve, and the refrigerant flow correction bypass valve includes a valve body that opens and closes the bypass passage.
A refrigerating device comprising: a temperature-sensitive element that is responsive to a refrigerant temperature at an outlet side of the condenser and opens the valve when the refrigerant temperature is equal to or lower than a predetermined value. 5. The refrigeration apparatus according to claim 4, wherein the temperature sensing element is disposed at a refrigerant inlet of the refrigerant flow rate correction bypass valve, and is responsive to a refrigerant temperature at a condenser outlet side. 6. The temperature sensing element is disposed in a spring chamber formed in a main body housing of a bypass valve for correcting a refrigerant flow rate, and is responsive to a refrigerant temperature on a condenser outlet side, which is alleviated by an ambient temperature. The refrigeration apparatus according to claim 4 or 5, wherein 7. The refrigeration apparatus according to claim 4, wherein the temperature sensing element is made of a shape memory alloy. 8. A refrigeration apparatus having a temperature expansion valve in a refrigerant circulation path for controlling a circulating refrigerant flow rate in accordance with a temperature load of an evaporator and maintaining a superheat degree of a refrigerant at an evaporator outlet side at a predetermined value. A refrigerant flow rate correction bypass valve, wherein the refrigerant flow rate correction bypass valve is provided in the middle of a bypass passage that bypasses the temperature expansion valve, and a valve body that opens and closes the bypass passage, and an outlet of a condenser. And a temperature sensing element that is responsive to the temperature of the refrigerant on the side and opens the valve element when the refrigerant temperature is equal to or lower than a predetermined value. 9. The refrigerant flow correction device according to claim 8, wherein the temperature sensing element is disposed at a refrigerant inlet of the refrigerant flow correction bypass valve and is responsive to a refrigerant temperature at a condenser outlet side. Bypass valve. 10. The cooling device according to claim 1, wherein the temperature sensing element is disposed in a spring chamber formed in a main body housing of the refrigerant flow rate correction bypass valve, and is responsive to the refrigerant temperature on the condenser outlet side, which is alleviated by the ambient temperature. The bypass valve for refrigerant flow correction according to claim 8 or 9, wherein 11. The temperature sensing element is made of a shape memory alloy.
4. The bypass valve for refrigerant flow correction according to claim 1. 12. A temperature expansion valve for a refrigerating and refrigerating apparatus for controlling a flow rate of a circulating refrigerant in accordance with a temperature load of an evaporator to maintain a superheat degree of a refrigerant at an evaporator outlet side at a predetermined value. A bypass passage that bypasses the main valve port for controlling the circulating refrigerant flow rate in accordance with the load amount and connects and connects the inlet port and the outlet port; a bypass valve body that opens and closes the bypass passage; A temperature expansion valve, comprising: a temperature sensing element that is responsive to a refrigerant temperature on an outlet side and opens the bypass valve body when the refrigerant temperature is equal to or lower than a predetermined value. 13. The temperature expansion valve according to claim 12, wherein the temperature sensing element is arranged at a refrigerant inlet of the temperature expansion valve, and is responsive to a refrigerant temperature at a condenser outlet side. 14. The temperature sensing element is disposed in a spring chamber formed in a main body housing of the temperature expansion valve, and is responsive to a refrigerant temperature at a condenser outlet side, which is alleviated by an ambient temperature. 14. The temperature expansion valve according to 12 or 13. 15. The temperature expansion valve according to claim 12, wherein the temperature sensing element is made of a shape memory alloy.