CN107816816B

CN107816816B - Refrigerating device

Info

Publication number: CN107816816B
Application number: CN201711193080.7A
Authority: CN
Inventors: 廖四清; 冯利伟; 曾令华; 王小龙; 李傲寒; 杨宇飞
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2017-11-24
Filing date: 2017-11-24
Publication date: 2023-05-26
Anticipated expiration: 2037-11-24
Also published as: CN107816816A

Abstract

The invention discloses a refrigerating device, comprising: the compressor comprises a shell, a first cylinder, a second cylinder and a first bearing, wherein a plunger channel and a plunger are arranged on the first bearing, and a plunger hole at the first end of the plunger channel is opposite to a cylinder cavity of the second cylinder and is communicated with the second air suction port; a reversing assembly; an outdoor heat exchanger and an indoor heat exchanger; an air supplementing device; the first switching component comprises a first interface to a fourth interface; the second switching component comprises a first port to a fourth port. According to the refrigerating device, the first switching component and the second switching component can realize the switching of the compressor between single-stage compression and two-stage compression, and the plunger in the plunger channel can realize the variable capacity of the second cylinder, so that the refrigerating/heating capacity of the refrigerating device can be improved, and the energy consumption can be reduced. The refrigerating device has the advantages of simple structure, convenient operation, strong heating and refrigerating capacity, low energy consumption and strong practicality.

Description

Refrigerating device

Technical Field

The invention relates to the field of refrigeration, in particular to a refrigeration device.

Background

Generally, an air conditioner adopts a two-stage compression mode to improve its own low-temperature heating capacity, so that the air conditioner can normally perform heating operation under a low-temperature working condition. However, the compressor cylinder ratio of the high pressure side and the low pressure side of the two-stage compression of the conventional air conditioner is fixed, and switching between two operation modes of the two-stage compression and the single-stage compression cannot be achieved, thereby reducing the adaptability of the compressor to different working conditions.

In the related art, a refrigerating device is provided, which comprises a first cylinder and a second cylinder, wherein the second cylinder is an unloading cylinder, the back of a sliding vane of the unloading cylinder is not provided with a spring, and the working mode of the second cylinder is switched mainly by the pressure of a sliding vane cavity. However, the refrigerating device can only adopt two-stage compression when in heating operation, and can only adopt single-stage compression when in refrigerating operation, thereby limiting the refrigerating capacity of the refrigerating device.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the refrigerating device which has the advantages of convenient operation and capability of realizing free switching between single-stage compression and two-stage compression.

According to an embodiment of the present invention, a refrigeration apparatus includes: the compressor comprises a shell, a first cylinder, a second cylinder and a first bearing, wherein the shell is provided with an exhaust pipe, the first bearing is arranged on one side, far away from the first cylinder, of the second cylinder, the first cylinder is provided with a first air suction port and a first exhaust port communicated with the exhaust pipe, the second cylinder is provided with a second air suction port and a second exhaust port, the first bearing is provided with a plunger channel and a plunger movably arranged in the plunger channel, and a plunger hole at the first end of the plunger channel is opposite to a cylinder cavity of the second cylinder and is communicated with the second air suction port; the reversing assembly is provided with a first valve port to a fourth valve port, and the first valve port is connected with the exhaust pipe; the first end of the indoor heat exchanger is connected with the third valve port; the air supplementing device is provided with a first inlet and outlet, a second inlet and outlet and an air supplementing port, a first throttling element is connected in series between the first inlet and outlet and the second end of the outdoor heat exchanger, and a second throttling element is connected in series between the second inlet and outlet and the second end of the indoor heat exchanger; the first switching component comprises a first interface to a fourth interface, the first interface is connected with the air supplementing port, the second interface is connected with the first air suction port, the third interface is connected with the fourth valve port, and the fourth interface is connected with the second air suction port; the second switching assembly comprises a first port and a fourth port, the first port is connected with the second exhaust port, the second port is communicated with the exhaust pipe, the third port is communicated with the second end of the plunger channel, and the fourth port is communicated with the space in the air supplementing device through a refrigerant channel.

According to the refrigerating device provided by the embodiment of the invention, the first switching component, the second switching component and the plunger channel are arranged, the first switching component and the second switching component can switch the internal flow paths of the first switching component and the second switching component to realize the switching of the compressor between single-stage compression and two-stage compression, and the plunger in the plunger channel can realize the capacity change of the second cylinder. When the compressor performs two-stage compression, the working volume of the second cylinder is maximum, so that the flow of the refrigerant can be increased, and the refrigerating/heating capacity of the refrigerating device is improved. When the compressor performs single-stage compression, the working volume of the second cylinder is reduced, so that the energy consumption of the refrigerating device can be reduced and the energy efficiency of the refrigerating device can be improved while the working requirement is met. The refrigerating device has the advantages of simple structure, convenient operation, strong heating and refrigerating capacity, low energy consumption and strong practicality.

According to some embodiments of the invention, the exhaust volume of the first cylinder is V1, and the exhaust volume of the second cylinder is V2 when the plunger hole is plugged, wherein V2/v1=0.8-2.

In some embodiments of the invention, the first cylinder has an exhaust volume V1 and the second cylinder has an exhaust volume V2 'when the plunger bore is open, where v2'/v1=0.05-0.4.

According to some embodiments of the invention, the refrigeration device further comprises a reservoir comprising an inlet connected to the fourth valve port and an outlet connected to the third port.

According to some embodiments of the invention, the first switching assembly and the second switching assembly are switched in linkage.

According to some embodiments of the invention, the first switching assembly, the second switching assembly and the reversing assembly are switched in linkage.

According to some embodiments of the invention, the first switching element is a four-way valve.

According to some embodiments of the invention, the second switching element is a four-way valve.

According to some embodiments of the invention, the reversing assembly is a four-way valve.

According to some embodiments of the invention, the air make-up device is a flash or subcooled heat exchanger.

According to some embodiments of the invention, the refrigeration device further comprises a heat exchanger assembly connected in series on the refrigerant channel.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of the overall structure of a refrigeration apparatus according to an embodiment of the present invention;

FIG. 2 is a top view of a second cylinder according to an embodiment of the present invention;

fig. 3 is a schematic view of the internal structure of the second cylinder shown in fig. 2;

FIG. 4 is a schematic view of the overall structure of a refrigeration apparatus according to an embodiment of the present invention, wherein the refrigeration apparatus is in a two-stage compressed mode of operation;

FIG. 5 is a schematic view of the overall structure of a refrigeration unit according to an embodiment of the present invention, wherein the refrigeration unit is in a single stage compressed mode of operation;

FIG. 6 is a schematic view of an overall structure of a refrigeration device according to an embodiment of the present invention, wherein a heat exchanger assembly is disposed on a refrigerant flow passage of the refrigeration device;

fig. 7 is a schematic diagram of an overall structure of a refrigeration apparatus according to an embodiment of the present invention, wherein a gas supplementing device of the refrigeration apparatus is a supercooling heat exchanger.

Reference numerals:

the refrigerating apparatus 100 is provided with a refrigerating device,

the compressor(s) 10 are configured to provide a compressor,

the housing 110 is configured to be positioned over the opening,

the first cylinder 120, the first suction port 120A, the first exhaust port 120B,

the second cylinder 130, the second suction port 130A, the second discharge port 130B,

the first bearing 140, plunger channel 140A, plunger 140B, plunger bore 140C,

the second bearing 150, the crankshaft 160, the middle separator 170, the exhaust pipe 180,

reversing assembly 20, first port 210, second port 220, third port 230, fourth port 240,

the outdoor heat exchanger 30, the first throttling element 310,

the indoor heat exchanger 40, the second throttling element 410, the heat exchanger assembly 420,

the air supply device 50, the first inlet and outlet 510, the second inlet and outlet 520, the air supply port 530, the third inlet and outlet 540, the fourth inlet and outlet 550, the first connecting channel 560, the second connecting channel 570,

the first switching assembly 60, the first interface 610, the second interface 620, the third interface 630, the fourth interface 640,

the second switching element 70, the first port 710, the second port 720, the third port 730, the fourth port 740,

reservoir 80, inlet 810, outlet 820,

a refrigerant passage 90.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

A refrigerating apparatus 100 according to an embodiment of the present invention, which refrigerating apparatus 100 can be used for cooling and heating indoor air, will be described with reference to fig. 1 to 7.

A refrigeration apparatus 100 according to an embodiment of the present invention includes: the compressor 10, the reversing assembly 20, the outdoor heat exchanger 30, the indoor heat exchanger 40, the air make-up device 50, the first switching assembly 60, and the second switching assembly 70.

As shown in fig. 1, 4-6, the compressor 10 may include a housing 110, a first cylinder 120, a second cylinder 130, and a first bearing 140, the first bearing 140 being disposed on a side of the second cylinder 130 remote from the first cylinder 120. The casing 110 may be provided with an exhaust pipe 180 and an intake pipe, the intake pipe may suck low-pressure refrigerant into the compressor 10, the compressor 10 may compress the refrigerant, and the compressed refrigerant may be discharged through the exhaust pipe 180.

Specifically, as shown in FIG. 3, the compressor 10 may further include a second bearing 150, a crankshaft 160, and a middle barrier 170. A first cylinder 120 and a second cylinder 130 are provided between the first bearing 140 and the second bearing 150, the first cylinder 120 is located at an upper end of the second cylinder 130, and a middle partition 170 is provided between the first cylinder 120 and the second cylinder 130. The first bearing 140 is located at the lower end of the second cylinder 130, and the second bearing 150 is located at the upper end of the first cylinder 120. The crankshaft 160 is connected to the first bearing 140 and the second bearing 150, respectively, and when the compressor 10 is operated, the crankshaft 160 may rotate to drive the pistons in the first cylinder 120 and the second cylinder 130 to rotate, thereby compressing the refrigerant.

As shown in fig. 1 to 3, the first cylinder 120 may be provided with a first suction port 120A and a first exhaust port 120B communicating with the exhaust pipe 180, and the second cylinder 130 may be provided with a second suction port 130A and a second exhaust port 130B. The first bearing 140 may be provided with a plunger channel 140A and a plunger 140B movably disposed in the plunger channel 140A, and a plunger hole 140C at a first end of the plunger channel 140A is opposite to a cylinder chamber of the second cylinder 130 and communicates with the second suction port 130A, and the plunger 140B may realize a capacity variation of the second cylinder 130. Specifically, the upper portion of the plunger 140B is always in a low pressure state. When the compressor 10 is in the single-stage compression operation mode, the lower end of the plunger 140B is in a low-pressure state, the plunger 140B is positioned at the lower end of the plunger channel 140A, and the cylinder chamber of the second cylinder 130 is communicated with the plunger hole 140C, so that the second suction port 130A cannot normally suck air when the piston in the second cylinder 130 moves between the second suction port 130A and the plunger hole 140C, and the refrigerant compression volume of the second cylinder 130 can be reduced. When the compressor 10 performs two-stage compression, the lower end of the plunger 140B is in a high pressure state. Because there is a pressure difference between the two ends of the plunger 140B, the plunger 140B will move upwards under the action of pressure, so that the plunger 140B can seal the plunger hole 140C, and at this time, the working volume of the second cylinder 130 is the maximum volume, and the refrigerant flow in the compressor 10 is the maximum.

As shown in fig. 1, 4-6, the reversing assembly 20 may include a first port 210, a second port 220, a third port 230, and a fourth port 240, the first port 210 may be connected to the exhaust pipe 180, a first end of the outdoor heat exchanger 30 may be connected to the second port 220, and a first end of the indoor heat exchanger 40 may be connected to the third port 230. The reversing assembly 20 can switch the flow direction of the refrigerant in the refrigeration device 100. Specifically, when the refrigeration device 100 performs a refrigeration operation, the first valve port 210 is connected to the second valve port 220, the third valve port 230 is connected to the fourth valve port 240, the compressed refrigerant may flow into the outdoor heat exchanger 30 through the reversing assembly 20, the refrigerant may exchange heat with outdoor air first, and then the refrigerant may flow into the throttling device (such as the first throttling element 310 shown in fig. 1), where the throttling device throttles and depressurizes the refrigerant, and the refrigerant is converted from a gaseous state to a gas-liquid mixed state. After the refrigerant in the gas-liquid mixed state enters the indoor heat exchanger 40, the indoor heat exchanger 40 is an evaporator, and the liquid refrigerant evaporates and absorbs heat of indoor air, so that the aim of reducing indoor temperature can be fulfilled, and the refrigerant subjected to indoor heat exchange flows back to the compressor 10 through the reversing assembly 20.

When the refrigerating apparatus 100 performs a heating operation, the first valve port 210 is connected to the third valve port 230, the second valve port 220 is connected to the fourth valve port 240, and a high-temperature and high-pressure refrigerant can flow into the indoor heat exchanger 40 through the reversing assembly 20, and exchange heat with indoor air in the indoor heat exchanger 40, so that the purpose of increasing the indoor temperature can be achieved. The refrigerant after heat exchange can flow into a throttling device (a second throttling element 410 shown in fig. 1) to throttle and decompress the refrigerant, then the refrigerant flows into the outdoor heat exchanger 30 to exchange heat with outdoor air, and finally flows back into the compressor 10 through the reversing assembly 20.

As shown in fig. 1, 4-6, the air compensating device 50 may include a first inlet 510, a second inlet 520, and an air compensating port 530, a first throttling element 310 may be connected in series between the first inlet 510 and the second end of the outdoor heat exchanger 30, and a second throttling element 410 may be connected in series between the second inlet 520 and the second end of the indoor heat exchanger 40. Specifically, the first throttling element 310 and the second throttling element 410 can throttle and depressurize the refrigerant in the refrigerant flow path, so that the normal circulation of the refrigerant can be ensured. When the air supplementing device 50 can separate the gaseous refrigerant from the liquid refrigerant, the separated gaseous refrigerant can enter the compressor 10 through the air supplementing opening 530, so that air can be supplemented to the air cylinder in the compressor 10, and further the working efficiency of the compressor 10 can be improved.

As shown in fig. 1, 4-6, the first switching assembly 60 may include a first interface 610, a second interface 620, a third interface 630, and a fourth interface 640. The first port 610 may be connected to the supply port 530, the second port 620 may be connected to the first suction port 120A, the third port 630 may be connected to the fourth valve port 240, and the fourth port 640 may be connected to the second suction port 130A.

As shown in fig. 1 and 4-6, the second switching assembly 70 may include a first port 710, a second port 720, a third port 730, and a fourth port 740, the first port 710 may be connected to the second exhaust port 130B, the second port 720 may be in communication with the exhaust pipe 180, the third port 730 may be in communication with the second end of the plunger channel 140A, and the fourth port 740 may be in communication with the inner space of the air compensating device 50 through the refrigerant channel 90.

Specifically, one end of the refrigerant passage 90 is connected to the fourth port 740, and the other end of the refrigerant passage 90 may be connected to a connection line between the air supply device 50 and the first switching unit 60, or may be directly connected to the air supply device 50. The first switching assembly 60 and the second switching assembly 70 may enable switching between two modes of operation, single stage compression and two stage compression, of the refrigeration unit 100. As shown in fig. 4, when the compressor 10 performs two-stage compression, the first interface 610 may be in communication with the second interface 620, the third interface 630 may be in communication with the fourth interface 640, the first port 710 may be in communication with the fourth port 740, and the second port 720 may be in communication with the third port 730. Since the second port 720 communicates with the exhaust pipe 180, the second end of the plunger passage 140A is in a high pressure state, and the plunger 140B moves upward and closes the plunger hole 140C, at which time the working volume of the second cylinder 130 is its maximum volume. The low pressure refrigerant from the reversing assembly 20 enters the first switching assembly 60 through the third port 630 and then flows into the second cylinder 130 through the fourth port 640. The second cylinder 130 may compress the refrigerant, and the refrigerant is converted from a low pressure state to a medium pressure state. The medium pressure refrigerant enters the second switching element 70 through the second discharge port 130B, and then enters the first switching element 60 through the fourth port 740 and the first port 610 in sequence. Then, the medium-pressure refrigerant sequentially enters the first cylinder 120 through the second interface 620 and the first air suction port 120A, the first cylinder 120 compresses the medium-pressure refrigerant again, and the medium-pressure refrigerant is converted into a high-pressure state, so that two-stage compression of the refrigerant is realized. Finally, the high-pressure refrigerant is discharged into the inner space of the case 110 through the second discharge port 130B.

Meanwhile, the air supplementing device 50 separates the refrigerant in the gas-liquid mixed state, and the gaseous refrigerant in the medium-pressure state enters the first switching assembly 60 through the air supplementing port 530 and then enters the first cylinder 120 through the second interface 620 and the first air suction port 120A in sequence, so that the purpose of supplementing air to the first cylinder 120 can be achieved, the refrigerant flow of the compressor 10 can be increased, and the working efficiency of the compressor 10 is improved.

As shown in fig. 5, when the compressor 10 performs single stage compression, the first interface 610 may be in communication with the fourth interface 640, the second interface 620 may be in communication with the third interface 630, the first port 710 may be in communication with the second port 720, and the third port 730 may be in communication with the fourth port 740. Since the third port 730 communicates with the exhaust pipe 180, the lower end of the plunger passage 140A is in a low pressure state, the plunger 140B is positioned at the lower end of the plunger passage 140A, and the cylinder chamber of the second cylinder 130 communicates with the plunger hole 140C, at which time the working volume of the second cylinder 130 is reduced. The low-pressure refrigerant from the reversing assembly 20 enters the first switching assembly 60 through the third port 630, and then flows into the first cylinder 120 through the second port 620, and the first cylinder 120 can compress the refrigerant, so that the refrigerant is converted from a low-pressure state to a high-pressure state. The refrigerant in the high pressure state is discharged into the inner space of the case 110 through the first exhaust port 120B. At the same time, the air compensating device 50 separates the refrigerant in the gas-liquid mixture state, and the gaseous refrigerant in the medium pressure state enters the first switching assembly 60 through the air compensating port 530, then sequentially enters the second cylinder 130 through the fourth interface 640 and the second air suction port 130A, compresses the refrigerant in the medium pressure state in the second cylinder 130, and then discharges the refrigerant into the inner space of the housing 110 through the second air discharge port 130B.

Thus, with the above-described design, switching of the compressor 10 between single-stage compression and two-stage compression can be achieved by switching the internal flow paths of the first switching assembly 60 and the second switching assembly 70. Under normal conditions, the load of the refrigeration device 100 is low, and the first switching assembly 60 and the second switching assembly 70 can be adjusted to enable the compressor 10 to enter a single-stage compression working mode, so that the energy consumption of the refrigeration device 100 can be reduced, and the energy efficiency can be improved. Under the working condition of extremely low temperature or high temperature, the load of the refrigeration device 100 is higher, the pressure ratio of the compressor 10 is increased and the refrigerant leakage amount is increased due to the high load, and the first switching component 60 and the second switching component 70 can be adjusted to enable the compressor 10 to enter a two-stage compression working mode, so that the pressure ratio of the compressor 10 can be reduced, the refrigerant leakage amount is reduced, the refrigerant flow of the compressor 10 can be increased, the refrigeration/heating capacity of the refrigeration device 100 can be improved, and the energy efficiency of the refrigeration device 100 can be improved.

According to the refrigerating apparatus 100 of the embodiment of the present invention, by providing the first switching assembly 60, the second switching assembly 70 and the plunger channel 140A, the first switching assembly 60 and the second switching assembly 70 can switch their internal flow paths to switch the compressor 10 between the single-stage compression and the two-stage compression, and the plunger 140B in the plunger channel 140A can realize the capacity change of the second cylinder 130. When the compressor 10 performs two-stage compression, the working volume of the second cylinder 130 is maximized, thereby increasing the flow rate of the refrigerant and enhancing the cooling/heating capacity of the refrigerating apparatus 100. When the compressor 10 performs single-stage compression, the working volume of the second cylinder 130 is reduced, thereby reducing the energy consumption of the refrigerating apparatus 100 and improving the energy efficiency of the refrigerating apparatus 100 while satisfying the working demand. The refrigerating device 100 has the advantages of simple structure, convenient operation, strong heating and refrigerating capacity, low energy consumption and strong practicability.

According to some embodiments of the present invention, the discharge volume of the first cylinder 120 is V1, and the discharge volume of the second cylinder 130 is V2 when the plunger hole 140C is blocked, wherein V2/v1=0.8 to 2, whereby the refrigerant flow rate of the compressor 10 can be increased. Specifically, when the plunger 140B blocks the plunger hole 140C, there is no communication between the cylinder chamber of the second cylinder 130 and the plunger hole 140C, and the exhaust volume of the second cylinder 130 is maximized, wherein 0.8 < V2/V1 < 2. The overall exhaust volume of the compressor 10 can be flexibly adjusted by adjusting the size of V2/V1, and the medium-pressure refrigerant compressed by the second cylinder 130 and the medium-pressure refrigerant in the air supplementing device 50 can enter the first cylinder 120 again for compression, so that the refrigerant flow in the compressor 10 can be improved, and the refrigerating/heating capacity of the refrigerating device 100 can be improved.

In some embodiments of the present invention, the discharge volume of the first cylinder 120 is V1, and the discharge volume of the second cylinder 130 is V2 'when the plunger hole 140C is opened, wherein V2'/v1=0.05 to 0.4, whereby the power consumption of the compressor 10 can be reduced. Specifically, when the plunger hole 140C is in an open state, the second suction port 130A is not normally suctioned while the piston in the second cylinder 130 moves between the second suction port 130A and the plunger hole 140C, and the exhaust volume of the second cylinder 130 is minimum, wherein 0.05 < V2'/V1 < 0.4. Therefore, the energy consumption of the compressor 10 can be reduced while the refrigerant flow requirement of the compressor 10 is met, so that the use flexibility and the practical performance of the refrigerating device 100 can be improved.

As shown in fig. 1, 4-6, according to some embodiments of the invention, the refrigeration device 100 may further include an accumulator 80, the accumulator 80 may include an inlet 810 and an outlet 820, the inlet 810 may be connected to the fourth valve port 240, and the outlet 820 may be connected to the third port 630, so that normal operation of the compressor 10 may be ensured. Specifically, when the refrigeration apparatus 100 is operated, the refrigerant after the heat exchange is returned to the compressor 10 through the fourth valve port 240, and the refrigerant at this time is in a gas-liquid mixed state, and if the liquid refrigerant directly enters the compressor 10 to be compressed, damage to compression components of the compressor 10 occurs. The liquid reservoir 80 can separate the gaseous refrigerant and the liquid refrigerant, and the liquid refrigerant can be stored in the lower portion of the liquid reservoir 80 by utilizing the gravity, and the gaseous refrigerant enters the compressor 10 through the air outlet in the upper portion of the liquid reservoir 80. In addition, impurities in the refrigerant pipeline can be brought into the compressor 10 in the circulating process of the refrigerant, and the impurities in the refrigerant can be filtered out by the filter device in the liquid reservoir 80, so that the compressor 10 can be protected.

According to some embodiments of the present invention, the first switching assembly 60 and the second switching assembly 70 may be switched in linkage, so that the operation flow of the refrigeration apparatus 100 may be optimized, which is convenient for the user to use practically. Specifically, when the refrigeration apparatus 100 switches between the two operation modes of single-stage compression and two-stage compression, the first switching assembly 60 and the second switching assembly 70 can simultaneously switch the flow paths inside thereof, thereby realizing the non-stop switching of the operation modes and further improving the operation efficiency of the refrigeration apparatus 100. It will be appreciated that the first switching assembly 60 and the second switching assembly 70 may be switched separately, and the operation may be selected according to the actual requirement. For example, when the refrigeration unit 100 switches modes of operation, a shutdown switch may be selected, with the flow path in the first switching assembly 60 switching first, and then the flow path in the second flow path switching again.

According to some embodiments of the present invention, the first switching assembly 60, the second switching assembly 70 and the reversing assembly 20 may be switched in a linkage manner, so that the operation flow of the refrigerating apparatus 100 may be optimized, and the actual use of the user may be facilitated. For example, a ganged trigger may be provided within the reversing assembly 20 in communication with the first switching assembly 60 and the second switching assembly 70. Under the extremely low temperature working condition, the refrigerating device 100 selects heating operation, and when the reversing component 20 reverses, the linkage trigger works, so that the first switching component 60 and the second switching component 70 can be driven to switch simultaneously, the working mode of the refrigerating device 100 can be adjusted in the shortest time, and the use comfort of a user can be improved.

According to some embodiments of the present invention, the first switching assembly 60 may be a four-way valve, so that installation and practical operation can be facilitated. Specifically, a solenoid valve coil may be provided in the four-way valve. When the refrigeration unit 100 performs single-stage compression, the four-way valve is powered off, the first interface 610 and the fourth interface 640 are turned on, and the second interface 620 and the third interface 630 are turned on. When the refrigeration device 100 performs two-stage compression, the four-way valve is powered on, the piston in the four-way valve moves, the first port 610 and the second port 620 are turned on, and the third port 630 and the fourth port 640 are turned on. Thus, the switching of the flow path in the first switching assembly 60 can be achieved by simple power-up and power-down, and the operation is convenient.

According to some embodiments of the present invention, the second switching assembly 70 may be a four-way valve, so that installation and practical operation can be facilitated. Specifically, a solenoid valve coil is provided in the four-way valve. When the refrigeration unit 100 performs single stage compression, the four-way valve is de-energized, the first port 710 and the second port 720 are conductive, and the third port 730 and the fourth port 740 are conductive. When the refrigeration device 100 performs two-stage compression, the four-way valve is powered on, the piston in the four-way valve moves, the first port 710 and the fourth port 740 are turned on, and the second port 720 and the third port 730 are turned on. Thus, switching of the flow path in the second switching assembly 70 can be achieved by simple power-up and power-down, and the operation is convenient.

According to some embodiments of the present invention, the reversing assembly 20 may be a four-way valve, so that installation and practical operation may be facilitated. Specifically, a solenoid valve coil is provided in the four-way valve. When the refrigerating apparatus 100 performs a refrigerating operation, the four-way valve is turned off, the first port 210 and the second port 220 are turned on, and the third port 230 and the fourth port 240 are turned on. When the refrigerating apparatus 100 performs a heating operation, the four-way valve is powered on, the piston in the four-way valve moves, the first port 210 is conducted with the third port 230, and the second port 220 is conducted with the fourth port 240.

As shown in fig. 1 and 4-7, according to some embodiments of the present invention, the air supplementing device 50 may be a flash evaporator or a supercooling heat exchanger, so that the working efficiency of the refrigeration device 100 may be improved. Specifically, when the air supplementing device 50 is a flash device, the air supplementing device 50 can supplement air to the compressor 10, so that the working efficiency of the compressor 10 can be improved. When the air supplementing device 50 is a supercooling heat exchanger, the air supplementing device 50 can realize heat exchange of the refrigerant, so that heat exchange efficiency of the indoor heat exchanger 40 and the outdoor heat exchanger 30 can be improved. It is to be understood that the design form of the air compensating device 50 is not limited thereto, and may be selected according to practical requirements, so long as the working efficiency of the refrigerating device 100 can be improved, which is not particularly limited in the present invention.

As shown in fig. 7, in an embodiment of the present invention, the air compensating device 50 is a supercooling heat exchanger, and the air compensating device 50 may include a first inlet 510, a second inlet 520, an air compensating port 530, and a fourth inlet 550, and a first connection channel 560 and a second connection channel 570 are provided in the air compensating device 50. Wherein one end of the first connection channel 560 is connected to the second inlet/outlet 520, and the other end of the first connection channel 560 is connected to the second end of the outdoor heat exchanger 30 through the fourth inlet/outlet 550. One end of the second connection channel 570 is connected to the first inlet/outlet 510, and the other end of the second connection channel 570 is connected to the air supply port 530.

When the refrigeration device 100 performs a refrigeration operation, a part of the refrigerant after the outdoor heat exchange flows into the first throttling element 310, the first throttling element 310 throttles and reduces the pressure of the refrigerant, and the refrigerant is converted from a medium-temperature and high-pressure state to a low-temperature and medium-pressure state and then enters the second connecting channel 570. Another portion of the refrigerant completing the outdoor heat exchange flows into the first connection passage 560. The low-temperature medium-pressure refrigerant in the second connection channel 570 exchanges heat with the medium-temperature high-pressure refrigerant in the first connection channel 560, the refrigerant in the first connection channel 560 is cooled and converted into a low-temperature state, and then flows into the second throttling element 410, the second throttling element 410 throttles and depressurizes the refrigerant again, and finally flows into the indoor heat exchanger 40. Thereby, the supercooling degree of the refrigerant entering the indoor heat exchanger 40 can be increased, and thus the cooling efficiency of the indoor heat exchanger 40 can be improved. After the heat exchange of the refrigerant in the second connection passage 570 is completed, the refrigerant flows into the compressor 10 through the first switching assembly 60.

When the refrigerating apparatus 100 performs a heating operation, the refrigerant after indoor heat exchange enters the first connection channel 560 after being throttled and depressurized by the second throttling element 410, and is in a medium-temperature and medium-pressure state. A part of the refrigerant in the first connection passage 560 enters the outdoor heat exchanger 30, another part of the refrigerant in the first connection passage 560 flows into the first throttling element 310, the first throttling element 310 throttles and depressurizes the refrigerant again, and the refrigerant is converted into a low-temperature and low-pressure state and enters the second connection passage 570. The refrigerant in the second connection channel 570 can exchange heat with the refrigerant in the first connection channel 560, so that the temperature of the refrigerant entering the outdoor heat exchanger 30 can be reduced, the heat exchange efficiency of the outdoor heat exchanger 30 can be improved, and the heating efficiency of the refrigerating device 100 can be improved. After the heat exchange of the refrigerant in the second connection passage 570 is completed, the refrigerant flows into the compressor 10 through the first switching assembly 60.

As shown in fig. 6, according to some embodiments of the present invention, the refrigeration apparatus 100 may further include a heat exchanger assembly 420, and the heat exchanger assembly 420 is connected in series to the refrigerant channel 90, thereby improving the energy utilization rate of the refrigerant. Specifically, the air supply device 50 may further be provided with a third inlet/outlet 540, one end of the refrigerant channel 90 is connected to the fourth port 740, and the other end of the refrigerant channel 90 is connected to the third inlet/outlet 540. When the refrigeration device 100 performs two-stage compression, the second cylinder 130 can discharge the medium-pressure refrigerant into the refrigerant channel 90 through the second switching assembly 70, and the medium-pressure refrigerant enters the heat exchanger assembly 420 when flowing in the refrigerant channel 90, and the heat exchanger assembly 420 can exchange heat with some specific devices. For example, the specific device may be an electronic component or the like in the refrigeration apparatus 100.

A refrigerating apparatus 100 according to an embodiment of the present invention, which can be used for cooling and heating indoor air, will be described in detail with reference to fig. 1 to 6. It is to be understood that the following description is exemplary only and is not intended to limit the invention in any way.

As shown in fig. 4 to 6, the refrigeration apparatus 100 includes: the compressor 10, the reversing assembly 20, the indoor heat exchanger 40, the outdoor heat exchanger 30, the air make-up device 50, the first switching assembly 60, the second switching assembly 70, and the accumulator 80.

As shown in fig. 2 to 3, the compressor 10 includes: the engine comprises a housing 110, a first cylinder 120, a second cylinder 130, a first bearing 140, a second bearing 150, a crankshaft 160 and a middle partition 170. The housing 110 is provided with an exhaust pipe 180 and an air suction pipe. The first cylinder 120 and the second cylinder 130 are disposed between the first bearing 140 and the second bearing 150, the first cylinder 120 is located at an upper end of the second cylinder 130, and a middle partition 170 is disposed between the first cylinder 120 and the second cylinder 130. The first bearing 140 is located at the lower end of the second cylinder 130, and the second bearing 150 is located at the upper end of the first cylinder 120. The crankshaft 160 is connected to the first and

second bearings

140 and 150, respectively, and the crankshaft 160 may rotate to drive pistons in the first and

second cylinders

120 and 130.

As shown in fig. 1 to 3, the first cylinder 120 is provided with a first intake port 120A and a first exhaust port 120B communicating with the exhaust pipe 180, and the second cylinder 130 is provided with a second intake port 130A and a second exhaust port 130B. The first bearing 140 is provided with a plunger passage 140A and a plunger 140B movably disposed in the plunger passage 140A, and a plunger hole 140C at an upper end of the plunger passage 140A is opposed to a cylinder chamber of the second cylinder 130 and communicates with the second suction port 130A. Wherein the upper portion of the plunger 140B is always in a low pressure state. The first cylinder 120 has a discharge volume V1, the second cylinder 130 has a discharge volume V2 when the plunger hole 140C is closed, and the second cylinder 130 has a discharge volume V2', v2/v1=1.5, v2'/v1=0.05 when the plunger hole 140C is open.

As shown in fig. 1 and 4-6, the reversing assembly 20 is a four-way valve, the reversing assembly 20 includes a first valve port 210, a second valve port 220, a third valve port 230 and a fourth valve port 240, the first valve port 210 is connected to the exhaust pipe 180, a first end of the outdoor heat exchanger 30 is connected to the second valve port 220, and a first end of the indoor heat exchanger 40 is connected to the third valve port 230.

As shown in fig. 1 and fig. 4 to fig. 6, the air compensating device 50 is a flash evaporator, the air compensating device 50 includes a first inlet and outlet 510, a second inlet and outlet 520 and an air compensating port 530, a first throttling element 310 is connected in series between the first inlet and outlet 510 and the second end of the outdoor heat exchanger 30, a second throttling element 410 is connected in series between the second inlet and outlet 520 and the second end of the indoor heat exchanger 40, and the first throttling element 310 and the second throttling element 410 can both throttle and reduce the pressure of the refrigerant in the refrigerant flow path. The reservoir 80 includes an inlet 810 and an outlet 820, the inlet 810 being coupled to the fourth valve port 240 and the outlet 820 being coupled to the third port 630.

As shown in fig. 1, 4-6, the first switching assembly 60 and the second switching assembly 70 are four-way valves. The first switching assembly 60 includes a first interface 610, a second interface 620, a third interface 630, and a fourth interface 640. The first port 610 is connected to the air supply port 530, the second port 620 is connected to the first air intake port 120A, the third port 630 is connected to the reservoir 80, and the fourth port 640 is connected to the second air intake port 130A. The second switching assembly 70 includes a first port 710, a second port 720, a third port 730, and a fourth port 740, the first port 710 is connected to the second exhaust port 130B, the second port 720 is in communication with the exhaust pipe 180, the third port 730 is in communication with the second end of the plunger channel 140A, and the fourth port 740 is in communication with the interior space of the air compensating device 50 through the refrigerant channel 90.

Specifically, under the low temperature condition, the refrigeration device 100 heats by adopting a two-stage compression mode, the reversing assembly 20, the first switching assembly 60 and the second switching assembly 70 are powered on simultaneously, the first valve port 210 is conducted with the third valve port 230, the second valve port 220 is conducted with the fourth valve port 240, the first interface 610 is conducted with the second interface 620, the third interface 630 is conducted with the fourth interface 640, the first port 710 is conducted with the fourth port 740, and the second port 720 is conducted with the third port 730. Since the second port 720 communicates with the exhaust pipe 180, the second end of the plunger passage 140A is in a high pressure state, and the plunger 140B moves upward and closes the plunger hole 140C, at which time the working volume of the second cylinder 130 is its maximum volume. The low pressure refrigerant from the reversing assembly 20 enters the first switching assembly 60 through the third port 630 and then flows into the second cylinder 130 through the fourth port 640. The second cylinder 130 compresses the refrigerant, and the refrigerant is converted from a low pressure state to a medium pressure state. The medium pressure refrigerant enters the second switching element 70 through the second discharge port 130B, and then enters the first switching element 60 through the fourth port 740 and the first port 610 in sequence. Then, the medium-pressure refrigerant sequentially passes through the second port 620 and the first suction port 120A to enter the first cylinder 120, the first cylinder 120 compresses the medium-pressure refrigerant again, the medium-pressure refrigerant is converted into a high-pressure state, and finally the medium-pressure refrigerant is discharged into the inner space of the housing 110 through the second discharge port 130B.

The high-temperature and high-pressure refrigerant enters the reversing assembly 20 through the exhaust pipe 180, and then sequentially passes through the first valve port 210 and the third valve port 230 to enter the indoor heat exchanger 40. The indoor heat exchanger 40 is a condenser, and the high-temperature and high-pressure refrigerant can exchange heat with the indoor air, thereby achieving the purpose of increasing the indoor temperature. The refrigerant with the indoor heat exchange is flowed into the second throttling element 410, the second throttling element 410 throttles and reduces the pressure of the refrigerant, and the refrigerant is converted into a gas-liquid two-phase state. The gas-liquid two-phase refrigerant flows into the air supplementing device 50, the air supplementing device 50 can separate the gaseous refrigerant from the liquid refrigerant, and the separated gaseous refrigerant enters the first cylinder 120 through the air supplementing port 530 and the refrigerant channel 90, so that the first cylinder 120 can be supplemented with air, and the working efficiency of the compressor 10 can be improved. The separated liquid refrigerant flows into the first throttling element 310 from the first inlet/outlet 510, and the refrigerant is throttled and depressurized again by the first throttling element 310. The refrigerant then enters the outdoor heat exchanger 30, and exchanges heat with the outdoor air. The refrigerant after outdoor heat exchange enters the liquid storage device 80 through the reversing assembly 20, the liquid storage device 80 can store the liquid refrigerant at the lower part of the liquid storage device 80 by utilizing the action of gravity, and the gaseous refrigerant enters the second cylinder 130 through the exhaust port at the upper part of the liquid storage device 80, so that a heating cycle is completed.

Under normal working conditions, the refrigeration device 100 performs refrigeration by adopting a single-stage compression mode, the reversing assembly 20, the first switching assembly 60 and the second switching assembly 70 are simultaneously powered off, the first valve port 210 is communicated with the second valve port 220, the third valve port 230 is communicated with the fourth valve port 240, the first interface 610 is communicated with the fourth interface 640, the second interface 620 is communicated with the third interface 630, the first port 710 is communicated with the second port 720, and the third port 730 is communicated with the fourth port 740. Since the third port 730 communicates with the exhaust pipe 180, the second end of the plunger passage 140A is in a low pressure state, and the plunger 140B is positioned at the lower end of the plunger passage 140A, at which time the working volume of the second cylinder 130 is minimized. The low-pressure refrigerant from the reversing assembly 20 enters the first switching assembly 60 through the third port 630, and then flows into the first cylinder 120 through the second port 620, and the first cylinder 120 can compress the refrigerant, so that the refrigerant is converted from a low-pressure state to a high-pressure state. The refrigerant in the high pressure state is discharged into the inner space of the case 110 through the first exhaust port 120B.

The high-temperature and high-pressure refrigerant enters the reversing assembly 20 through the exhaust pipe 180, sequentially enters the outdoor heat exchanger 30 through the first valve port 210 and the second valve port 220, and can exchange heat with outdoor air. The refrigerant having completed the outdoor heat exchange flows into the first throttling element 310, the first throttling element 310 throttles and depressurizes the refrigerant, and then the refrigerant flows into the air supplementing device 50. The air compensating device 50 can separate the gaseous refrigerant from the liquid refrigerant, and the separated gaseous refrigerant is in a medium pressure state and enters the second cylinder 130 through the air compensating port 530 and the refrigerant channel 90. The second cylinder 130 compresses the refrigerant in a medium pressure state, and then discharges the refrigerant into the inner space of the case 110 through the second discharge port 130B. The separated liquid refrigerant enters the second throttling element 410 through the second inlet and outlet 520, the second throttling element 410 throttles and depressurizes the refrigerant again, and then the refrigerant flows into the indoor heat exchanger 40. The indoor heat exchanger 40 is an evaporator, and the liquid refrigerant evaporates and absorbs the temperature of the indoor air, thereby achieving the purpose of lowering the room temperature. The refrigerant after indoor heat exchange enters the liquid storage device 80 through the reversing assembly 20, the liquid storage device 80 can store the liquid refrigerant at the lower part of the liquid storage device 80 by utilizing the action of gravity, and the gaseous refrigerant enters the first cylinder 120 through the exhaust port at the upper part of the liquid storage device 80, so that one refrigeration cycle is completed.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration device, comprising:

the compressor comprises a shell, a first cylinder, a second cylinder and a first bearing, wherein the shell is provided with an exhaust pipe, the first bearing is arranged on one side, far away from the first cylinder, of the second cylinder, the first cylinder is provided with a first air suction port and a first exhaust port communicated with the exhaust pipe, the second cylinder is provided with a second air suction port and a second exhaust port, the first bearing is provided with a plunger channel and a plunger movably arranged in the plunger channel, and a plunger hole at the first end of the plunger channel is opposite to a cylinder cavity of the second cylinder and is communicated with the second air suction port;

the reversing assembly is provided with a first valve port to a fourth valve port, and the first valve port is connected with the exhaust pipe;

the first end of the indoor heat exchanger is connected with the third valve port;

the air supplementing device is provided with a first inlet and outlet, a second inlet and outlet and an air supplementing port, a first throttling element is connected in series between the first inlet and outlet and the second end of the outdoor heat exchanger, and a second throttling element is connected in series between the second inlet and outlet and the second end of the indoor heat exchanger;

the first switching component comprises a first interface to a fourth interface, the first interface is connected with the air supplementing port, the second interface is connected with the first air suction port, the third interface is connected with the fourth valve port, and the fourth interface is connected with the second air suction port;

the second switching assembly comprises a first port and a fourth port, the first port is connected with the second exhaust port, the second port is communicated with the exhaust pipe, the third port is communicated with the second end of the plunger channel, and the fourth port is communicated with the space in the air supplementing device through a refrigerant channel.

2. The refrigeration unit of claim 1 wherein the first cylinder has an exhaust volume V1 and the second cylinder has an exhaust volume V2 when the plunger bore is blocked, wherein V2/v1 = 0.8-2.

3. The refrigeration unit of claim 2 wherein the first cylinder has a discharge volume V1 and the second cylinder has a discharge volume V2 'when the plunger bore is open, wherein v2'/v1=0.05-0.4.

4. A refrigeration device as recited in claim 1 further comprising a reservoir including an inlet and an outlet, the inlet being connected to the fourth port and the outlet being connected to the third port.

5. The refrigeration unit of claim 1 wherein said first switching assembly and said second switching assembly are ganged.

6. The refrigeration unit of claim 1 wherein said first switching assembly, said second switching assembly and said reversing assembly are ganged in a switching manner.

7. The refrigeration unit of claim 1 wherein said first switching assembly is a four-way valve.

8. The refrigeration unit of claim 1 wherein the second switching assembly is a four-way valve.

9. The refrigeration unit of claim 1 wherein said reversing assembly is a four-way valve.

10. The refrigeration unit of claim 1, wherein the air make-up device is a flash or subcooled heat exchanger.

11. The refrigeration unit as recited in any one of claims 1 to 10 further comprising a heat exchanger assembly connected in series with said refrigerant passage.