CN108007005B - Flash evaporation refrigeration system, the refrigerator with the refrigeration system and its control method - Google Patents

Abstract

The invention discloses a flasher refrigeration system, a refrigerator with the refrigeration system and a control method thereof, wherein the flasher refrigeration system includes: a compressor, a condenser, a first throttling part, a flasher, a second section A closed circuit formed by connecting flow components, evaporators, check valves and return air heat exchangers in sequence; refrigerant circulates in the closed circuit for refrigeration; solenoid valves have two ports of inlet and outlet, and the inlet and flasher connection, the outlet is connected with the one-way valve and the return air heat exchanger; the control panel is connected with the solenoid valve, and is used to control the conduction and closing of the solenoid valve; in addition, a refrigerator with the refrigeration system and Its control method; the present invention controls the suction state of the gaseous refrigerant of the flasher to the suction port of the compressor through a solenoid valve, and adopts two times of throttling, which improves the gas-liquid separation effect of the flasher on the refrigerant, and not only realizes It improves the energy-saving operation of the refrigerator, and is conducive to the control of the overall cost of the product.

Description

Flasher refrigeration system, refrigerator with same and control method thereof

technical field

The invention relates to the technical field of refrigeration, in particular to a flasher refrigeration system, a refrigerator with the refrigeration system and a control method thereof.

Background technique

Refrigerator cooling requires energy. It is the relentless pursuit of refrigerator manufacturers to improve the power consumption of refrigerators by adopting various technical measures to make refrigerators more and more energy-efficient.

The refrigeration system of a conventional refrigerator is shown in FIG. When the refrigerator is refrigerated, the direction of the refrigerant in the refrigeration system is: compressor 10 → condenser 20 → return air heat exchanger 50 (first heat exchange tube) → throttling component 30 → evaporator 40 → return air heat exchanger 50 (second heat exchange tube)→compressor 10.

More specifically, during the refrigeration process of the refrigerator, the low-temperature and low-pressure refrigerant gas from the outlet of the evaporator 40 is compressed by the compressor 10 to become high-temperature and high-pressure refrigerant gas and enters the condenser 20. After being condensed by the condenser 20, The medium-temperature and high-pressure liquid refrigerant enters the evaporator 40 after being throttled and decompressed by the throttling part 30 (usually a capillary tube), and then evaporates and absorbs heat through the evaporator 40. The evaporated low-temperature and low-pressure refrigerant gas passes through the return After the air heat exchanger 50 exchanges heat further, it flows back to the compressor 10, and the above process repeats itself to achieve the continuous cooling effect of the refrigerator.

For the refrigeration system of traditional refrigerators, energy-saving measures are mainly carried out for the above-mentioned components, such as increasing the COP of the compressor, improving the efficiency of the condenser and evaporator, optimizing the design of throttling components, etc. Today, products and technologies are becoming more and more homogeneous. Conventional energy-saving technologies are gradually facing technical bottlenecks.

The research results show that the refrigerant that flows into the evaporator inlet through the outlet of the throttling component usually contains two states of liquid and gas. Since the gas refrigerant cannot achieve phase change refrigeration, the existence of the gas refrigerant is not conducive to the improvement of the efficiency of the refrigeration system. influences. Therefore, if the refrigerant liquid and gas can be separated at the inlet of the evaporator, the efficiency of the refrigeration system can be better improved, and the effect of energy-saving operation of the refrigerator can be achieved. However, the refrigeration system of the traditional refrigerator is limited by the inherent characteristics of the existing refrigeration system structure, and cannot realize the separation of refrigerant liquid and gas after throttling.

Therefore, it is necessary to provide an improved refrigerator refrigeration system to solve the above problems.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flasher refrigeration system, a refrigerator with the refrigeration system and its control method for the deficiencies of the prior art. Through the gas-liquid separation of the refrigerant by the flasher, The refrigerant liquid is supplied to the evaporator, and the refrigerant gas is directed to the suction port of the compressor, thereby realizing the high-efficiency operation of the refrigeration system and finally meeting the requirements of energy-saving operation of the refrigerator.

In order to achieve the above object, the present invention adopts following technical scheme:

A flasher refrigeration system comprising:

Compressor, condenser, first throttling part, flasher, second throttling part, evaporator, one-way valve and return air heat exchanger are connected in sequence to form a closed loop;

Refrigerant circulating refrigeration in said closed circuit;

The solenoid valve has two ports of inlet and outlet, the inlet is connected with the flasher, and the outlet is connected with the one-way valve and the return air heat exchanger;

The control board is connected with the solenoid valve and is used to control the conduction and closing of the solenoid valve;

The flasher has first to third ports, the first port of the flasher is connected to the first throttling part, the second port is connected to the second throttling part, and the third port is connected to the The solenoid valve is connected; the one-way valve has two ports of inlet and outlet, the inlet of the one-way valve is connected with the evaporator, and the outlet is connected with the solenoid valve.

There are two evaporators, including a first evaporator and a second evaporator, the first evaporator and the second evaporator are connected in series, the first evaporator is placed in the first room, and the second evaporator is placed in the The second room.

The first compartment temperature sensor is connected to the control board and is used to detect the temperature of the interior space of the first compartment of the refrigerator;

The second compartment temperature sensor is connected to the control board and is used to detect the temperature of the inner space of the second compartment of the refrigerator;

The ambient temperature sensor is connected with the control board and is used to detect the ambient temperature of the refrigerator, and the control board controls the conduction and closing of the electromagnetic valve according to the ambient temperature.

The return air heat exchanger has a first heat exchange tube and a second heat exchange tube;

The first heat exchange tube and the second heat exchange tube of the return air heat exchanger are in contact with each other to realize heat exchange; the inlet of the first heat exchange tube is connected to the condenser, and the outlet is connected to the first throttling component; The inlet of the second heat exchange tube is respectively connected with the electromagnetic valve and the one-way valve, and the outlet is connected with the suction port of the compressor.

The flasher is composed of a cylinder body and an oblique insertion tube arranged on the cylinder body, and the oblique insertion tube and the cylinder body are arranged at an angle of 45°.

The first throttling component and the second throttling component are capillary tubes or throttle valves.

It also includes: a temperature control controller, connected to the compressor through the control board, located inside the refrigerator, and used to control the operation and shutdown of the compressor.

A refrigerator, comprising the flasher refrigeration system, wherein the flasher is arranged in the freezing chamber of the refrigerator.

The control method of the refrigerator,

The compressor, condenser, first throttling part, flasher, second throttling part, evaporator, one-way valve and return air heat exchanger are connected in series to form a closed loop, and the refrigerant flows in the closed loop through The throttling part converts the high-pressure liquid refrigerant into a low-pressure liquid refrigerant and enters the evaporator to realize cycle refrigeration, and a solenoid valve controlled by the control board is connected in parallel between the third port of the flasher and the outlet of the one-way valve , so that the refrigeration system has two working modes and states. For example, when the system works at a higher ambient temperature, the heat load of the refrigerator is at a larger value, the heat dissipation effect is poor, and the subcooling degree of the refrigerant is reduced. As a result, the amount of gaseous refrigerant at the outlet end of the throttling component increases. At this time, the solenoid valve controlled by the control panel is in a conduction state, increasing the suction speed of the gaseous refrigerant to the suction port of the compressor, and preventing the gaseous refrigerant from flowing into the evaporator; When the system works at a lower ambient temperature, the heat load of the refrigerator is at a smaller value, the heat dissipation effect is better, and the subcooling degree of the refrigerant is good, so the amount of gaseous refrigerant at the outlet end of the throttling part is reduced, and at the same time, the inside of the flasher The refrigerant liquid increases, and the liquid level rises. At this time, the solenoid valve controlled by the control board is closed to reduce the suction speed of the gaseous refrigerant to the suction port of the compressor, so as to avoid high liquid level in the flasher. The liquid refrigerant flows into the suction port of the compressor through the solenoid valve, causing the liquid hammer problem of the compressor cylinder or valve plate.

Compared with the prior art, the present invention has the following advantages: the suction state of the gaseous refrigerant of the flasher to the suction port of the compressor is controlled by a solenoid valve, and compared with the adjustment scheme using an electric flow regulating valve, the control is simpler and has It is conducive to the control of the overall cost of the product; at the same time, two throttling parts are used to realize two throttling, which better improves the gas-liquid separation effect of the flasher on the refrigerant.

The invention uses the gas-liquid separation of the refrigerant by the flasher to supply the refrigerant liquid to the evaporator and guide the refrigerant gas to the suction port of the compressor, thereby realizing the high-efficiency operation of the refrigeration system and finally meeting the requirements of energy-saving operation of the refrigerator. Require. In addition, by installing a one-way valve at the outlet of the evaporator, gaseous refrigerant can be prevented from flowing into the evaporator from the outlet of the evaporator, thus improving the working stability of the refrigeration system; The reasonable angle between the two intubation tubes improves the separation effect of refrigerant gas and liquid, avoids the liquid refrigerant flowing into the compressor suction port, and causes the liquid hammer problem of the compressor cylinder or valve plate, thereby improving the working reliability of the refrigeration system; Through two throttling processes, the subcooling degree of the refrigerant liquid in the flasher is improved, and the gas-liquid separation effect of the flasher on the refrigerant is improved; the gaseous refrigerant in the flasher is controlled by using a low-cost solenoid valve The suction state to the suction port of the compressor replaces the high-cost electric flow regulating valve, so the structure is simple, which is conducive to the control of the overall cost of the product.

Description of drawings

Fig. 1 is a refrigeration system in the prior art.

Fig. 2 is the refrigeration system in Embodiment 1 provided by the present invention.

Fig. 3 is the refrigeration system in the second embodiment provided by the present invention.

Fig. 4 is a schematic structural view of the flasher in the refrigeration system shown in Fig. 2 and Fig. 3 .

Fig. 5 is a schematic diagram of the connection between the main control board and the temperature sensor of the refrigerating chamber, the sensor of the freezing chamber, the solenoid valve and the ambient temperature sensor in the refrigeration system shown in Fig. 2 and Fig. 3 .

Fig. 6 is a control flowchart of the solenoid valve in the refrigeration system shown in Fig. 2 and Fig. 3 .

Wherein, the corresponding relationship between reference numerals and component names in Fig. 2 and Fig. 3 is:

10 compressor, 20 condenser, 30 throttling parts, 40 evaporator, 401 first evaporator, 402 second evaporator, 50 return air heat exchanger, 60 flasher.

Detailed ways

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

Embodiment one:

As shown in Figure 2, a flasher refrigeration system includes: a compressor 10, a condenser 20, a first throttling component 30, a second throttling component 90, an evaporator 40, a return air heat exchanger 50, a flash The closed circuit that the generator 60 and the one-way valve 80 are connected in sequence;

Refrigerant, which circulates refrigeration in a closed circuit;

The compressor 10 has a suction port 11 and an exhaust port 12;

The flasher 60 has a first port 61, a second port 62 and a third port 63;

The return air heat exchanger 50 in the refrigeration system has a first heat exchange tube 51 and a second heat exchange tube 52 .

The first port 61 of the flasher 60 is connected to the outlet 32 of the throttling component 30 , the second port 62 is connected to the inlet 41 of the evaporator 40 , and the third port 63 is connected to the inlet 71 of the solenoid valve 70 .

The first heat exchange tube 51 and the second heat exchange tube 52 of the return air heat exchanger 50 are in contact with each other to realize heat exchange; the inlet 511 of the first heat exchange tube 51 is connected to the outlet 22 of the condenser 20, and the outlet 512 is connected to the outlet 22 of the condenser 20. The inlet 31 of the throttling component 30 is connected; the inlet 522 of the second heat exchange pipe 52 is connected with the outlet 72 of the solenoid valve 70 and the outlet 82 of the one-way valve 80 respectively, and the outlet 521 is connected with the suction port 11 of the compressor 10;

The first throttling component 30 and the second throttling component 90 may be in any form such as a capillary tube or a throttle valve.

Embodiment two:

The difference from Embodiment 1 is that in this embodiment, the evaporator is composed of a plurality of evaporators, including a first evaporator 401 and a second evaporator 402, and the first evaporator 401 is placed in the first room, with For cooling in the first room, the second evaporator 402 is placed in the second room for cooling in the second room. The first and second evaporators are connected in series, as shown in FIG. 3 .

The present invention provides a refrigerator comprising: the flasher refrigeration system as described in any one of the above embodiments.

Since the refrigerator provided by the present invention includes the refrigeration system described in any of the above embodiments, it has all the beneficial effects of the refrigeration system described in any of the above embodiments, and will not describe them here.

Further, the flasher 60 is composed of a cylinder body 601 and an oblique insertion tube 602, and the oblique insertion tube 602 and the cylinder body 601 are arranged at an angle of 45° to obtain a better refrigerant gas-liquid separation effect, as shown in FIG. 4 .

Further, the first compartment temperature sensor 120 is connected to the control board 100 for detecting the temperature of the interior space of the first compartment of the refrigerator; the second compartment temperature sensor 130 is connected to the control board 100 , It is used to detect the temperature of the inner space of the second compartment of the refrigerator; the ambient temperature sensor 110 is connected to the control board 100 and is used to detect the ambient temperature of the refrigerator. The ambient temperature value controls the opening degree of the solenoid valve 70 , as shown in FIG. 5 .

Figure 6 shows the control method of the electromagnetic valve 70 in the refrigeration system: after the refrigerator is powered on, the electromagnetic valve 70 is reset to the minimum opening (or completely closed) state, and the temperature value detected by the temperature sensor in any room of the refrigerator The temperature difference △T of the set temperature value determines whether the refrigerator enters a stable operation state. In a stable running state, when the ambient temperature value Ta detected by the ambient temperature sensor 110 is greater than or equal to the set value (for example, 16°C) ° C, the control board 100 controls the solenoid valve 70 to be in a conduction state; when the ambient temperature sensor 110 detects When the ambient temperature value Ta is lower than the set value (for example, 16° C.), the control board 100 controls the solenoid valve 70 to be in a closed state;

To sum up, in the refrigerator and its refrigeration system provided by the present invention, the refrigerant flows through the compressor 10, the condenser 20, the first throttling component 30, the second throttling component 90, the evaporator 40, and the return air heat exchanger 50. and the flasher 60 are connected in series in sequence, and the outlet 42 of the evaporator 40 is circulated and refrigerated in the closed loop formed by the one-way valve 80, the return air heat exchanger 50 and the suction port 11 of the compressor 10, and the present invention Through the function of the flasher 60, the refrigerant liquid is supplied to the evaporator, and the refrigerant gas is guided to the suction port of the compressor 10, which not only realizes the energy-saving operation of the refrigerator, but also facilitates the control of the overall cost of the product.

In the present invention, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection ; "Connected" can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the present invention In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A control method for a refrigerator, the refrigerator comprising a flasher refrigeration system, the flasher refrigeration system comprising: Compressor, condenser, first throttling part, flasher, second throttling part, evaporator, one-way valve and return air heat exchanger are connected in sequence to form a closed circuit; Refrigerant circulating refrigeration in said closed circuit; The solenoid valve has two ports of inlet and outlet, the inlet is connected with the flasher, and the outlet is connected with the one-way valve and the return air heat exchanger; The control board is connected with the solenoid valve and is used to control the conduction and closing of the solenoid valve; The flasher has first to third ports, the first port of the flasher is connected to the first throttling part, the second port is connected to the second throttling part, and the third port is connected to the The solenoid valve is connected; the one-way valve has two ports of inlet and outlet, the inlet of the one-way valve is connected with the evaporator, and the outlet is connected with the solenoid valve; It is characterized in that: the control method is as follows: The compressor, condenser, first throttling part, flasher, second throttling part, evaporator, one-way valve and return air heat exchanger are connected in series to form a closed loop, and the refrigerant flows in the closed loop through The throttling part converts the high-pressure liquid refrigerant into a low-pressure liquid refrigerant and enters the evaporator to realize cycle refrigeration, and a solenoid valve controlled by the control board is connected in parallel between the third port of the flasher and the outlet of the one-way valve , so that the refrigeration system has two working modes and states. When the system works at a higher ambient temperature, the heat load of the refrigerator is at a larger value, the heat dissipation effect is poor, and the subcooling degree of the refrigerant is reduced, resulting in energy saving. The amount of gaseous refrigerant at the outlet of the flow part increases. At this time, the solenoid valve controlled by the control board is in a conducting state, which increases the suction speed of the gaseous refrigerant to the suction port of the compressor and prevents the gaseous refrigerant from flowing into the evaporator; When working in a low ambient temperature state, the heat load of the refrigerator is at a small value, the heat dissipation effect is better, and the subcooling degree of the refrigerant is good, so the amount of gaseous refrigerant at the outlet end of the throttling part is reduced, and the refrigerant inside the flasher As the liquid increases, the liquid level rises. At this time, the solenoid valve controlled by the control board is in a closed state, which reduces the suction speed of the gaseous refrigerant to the suction port of the compressor, and prevents the liquid refrigerant from passing through when the liquid level in the flasher is high. The solenoid valve flows into the suction port of the compressor, causing the liquid hammer problem of the compressor cylinder or valve plate. 2. The control method of the refrigerator according to claim 1, wherein the flasher refrigeration system further comprises: The first compartment temperature sensor is connected to the control board and is used to detect the temperature of the interior space of the first compartment of the refrigerator; The second compartment temperature sensor is connected to the control board and is used to detect the temperature of the inner space of the second compartment of the refrigerator; The ambient temperature sensor is connected with the control board and is used to detect the ambient temperature of the refrigerator, and the control board controls the conduction and closing of the electromagnetic valve according to the ambient temperature. 3. The control method of the refrigerator according to claim 1, characterized in that: After the refrigerator is powered on and running, the solenoid valve resets to the minimum opening degree or completely closed state. By monitoring the temperature sensor in any compartment of the refrigerator, the temperature difference ΔT between the temperature value and the set temperature value is detected. When the temperature difference ΔT is less than 1.0 ℃, it indicates that the refrigerator has entered a stable operation state; in a stable operation state, when the ambient temperature value Ta detected by the ambient temperature sensor is greater than or equal to the set value, the control board controls the solenoid valve to be in a conduction state; When the ambient temperature value Ta is lower than the set value, the control panel controls the solenoid valve to be closed. 4. The control method of the refrigerator according to claim 1, characterized in that: There are two evaporators, including a first evaporator and a second evaporator, the first evaporator and the second evaporator are connected in series, the first evaporator is placed in the first room, and the second evaporator is placed in the The second room. 5. The control method of the refrigerator according to claim 1, characterized in that: The return air heat exchanger has a first heat exchange tube and a second heat exchange tube; The first heat exchange tube and the second heat exchange tube of the return air heat exchanger are in contact with each other to realize heat exchange; the inlet of the first heat exchange tube is connected to the condenser, and the outlet is connected to the first throttling component; The inlet of the second heat exchange tube is respectively connected with the electromagnetic valve and the one-way valve, and the outlet is connected with the suction port of the compressor. 6. The control method of the refrigerator according to claim 1, characterized in that: The flasher is composed of a cylinder body and an oblique insertion tube arranged on the cylinder body, and the oblique insertion tube and the cylinder body are arranged at an angle of 45°. 7. The control method of the refrigerator according to claim 1, characterized in that: The first throttling component and the second throttling component are capillary tubes or throttle valves. 8. The control method of the refrigerator according to claim 1, wherein the flash refrigeration system further comprises: The temperature control controller is connected with the compressor through the control board and is located inside the refrigerator, and is used to control the operation and shutdown of the compressor.