A refrigeration and heating integrated heat exchange system

Abstract

The present invention provides a refrigeration and heating integrated heat exchange system, which includes: a compressor and a first heat exchanger, the first heat exchanger can be connected to the exhaust port of the compressor so that the refrigerant releases heat in the first heat exchanger; the refrigerant includes a low boiling point refrigerant, a medium boiling point refrigerant and a high boiling point refrigerant; one end of the second heat exchanger can be connected to the air intake of the compressor and the other end can be connected to the first heat exchanger, and the high boiling point refrigerant can be refrigerated in the second heat exchanger; one end of the third heat exchanger can be connected to the air intake of the compressor and the other end can be connected to the first heat exchanger, and the low boiling point refrigerant can absorb heat in the third heat exchanger for refrigeration. The present invention can make the refrigerant effectively utilize heat or cold to produce required hot water, air cold, freezing cold, refrigerator cold, etc., effectively utilize waste heat, and make full use of the waste heat generated in the refrigeration process for the heating system, thereby improving the energy efficiency of the system.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a refrigeration and heating integrated heat exchange system. Background Art

[0002] Currently, large refrigeration systems such as refrigerators and freezers consume significant amounts of energy during the cooling process and release significant amounts of heat into the air, resulting in energy waste. Heating or cooling devices such as water heaters, air conditioners, and refrigerators all have separate external units, resulting in high overall costs and a large footprint (especially for commercial heating or cooling systems). With the development of society and the economy, energy conservation is becoming increasingly prominent, and integrated devices and systems have a broad market potential.

[0003] Since a large amount of heat is lost when the heating or cooling devices such as water heaters, air conditioners, and refrigerators in the prior art work alone, a considerable amount of waste heat is not utilized; and the separate outdoor units of the heating or cooling devices such as water heaters, air conditioners, and refrigerators each have a high overall cost and occupy a large area (especially commercial heating or cooling devices) and other technical problems, the present invention studies and designs a cooling and heating integrated heat exchange system. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that a large amount of heat loss occurs when heating or cooling devices such as water heaters, air conditioners, and refrigerators work alone, thereby providing an integrated cooling and heating heat exchange system.

[0005] In order to solve the above problems, the present invention provides an integrated cooling and heating heat exchange system, which includes:

[0006] A compressor and a first heat exchanger, wherein the first heat exchanger is communicable with an exhaust port of the compressor so that the refrigerant releases heat in the first heat exchanger;

[0007] The refrigerant is a mixed non-azeotropic refrigerant, including a low-boiling-point refrigerant, a medium-boiling-point refrigerant and a high-boiling-point refrigerant, wherein, from low to high boiling point, low-boiling-point refrigerant < medium-boiling-point refrigerant < high-boiling-point refrigerant;

[0008] The system further comprises a second heat exchanger, one end of which is connectable to the air intake port of the compressor and the other end of which is connectable to the first heat exchanger, and a first throttling device is provided between the first heat exchanger and the second heat exchanger, wherein the high-boiling-point refrigerant can absorb heat in the second heat exchanger to provide cooling;

[0009] It also includes a third heat exchanger, one end of which can be connected to the suction port of the compressor and the other end can be connected to the first heat exchanger, and a second throttling device is also provided between the first heat exchanger and the third heat exchanger. The low-boiling-point refrigerant can absorb heat in the third heat exchanger to cool.

[0010] Preferably, the device further comprises an outdoor heat exchanger, a first branch and a second branch, wherein one end of the first branch is connectable to the first heat exchanger and the other end is connectable to the first throttling device, the first branch passes through the outdoor heat exchanger so that the refrigerant passing through the first branch can release heat in the outdoor heat exchanger, and a third control valve is provided on the first branch;

[0011] One end of the second branch can be connected to the suction port of the compressor, and the other end can be connected to the second heat exchanger or the third heat exchanger. The second branch also passes through the outdoor heat exchanger so that the refrigerant passing through the second branch can absorb heat in the outdoor heat exchanger. A fourth control valve is provided on the second branch.

[0012] Preferably, it also includes a third branch and a fourth branch, the third branch is connected in parallel with the first branch, and a second control valve is provided on the third branch, the fourth branch is connected in parallel with the second branch, and a fifth control valve is provided on the fourth branch.

[0013] Preferably, the pipeline where the first heat exchanger is located is the fifth branch, a sixth control valve is provided on the fifth branch, and a sixth branch is further provided in parallel with the fifth branch, and the first control valve is provided on the sixth branch.

[0014] Preferably, a first flash evaporator is further provided between the first throttling device and the second heat exchanger, the input end of the first flash evaporator is connected to the first throttling device, the second heat exchanger is provided on the first liquid outlet pipeline of the first flash evaporator, the second throttling device is provided on the first gas outlet pipeline of the first flash evaporator, and a third throttling device is further provided on the pipe section of the first liquid outlet pipeline located between the first flash evaporator and the second heat exchanger.

[0015] Preferably, a second flash evaporator is further included, the first gas outlet pipeline is connected to the input end of the second flash evaporator, and the second throttling device is provided on the first gas outlet pipeline, and the second gas outlet pipeline of the second flash evaporator can be connected to the third heat exchanger;

[0016] A fourth throttling device is provided on the second liquid outlet pipeline of the second flash evaporator, and the liquid outlet pipeline of the second flash evaporator can also be connected to the suction port of the compressor.

[0017] Preferably, a first heat recovery device is also included, and the second gas outlet pipeline passes through the first heat recovery device, and at the same time, the pipe section of the second liquid outlet pipeline located between the fourth throttling device and the compressor passes through the first heat recovery device, so that the refrigerant in the second gas outlet pipeline and the refrigerant in the second liquid outlet pipeline exchange heat in the first heat recovery device, and the refrigerant in the second gas outlet pipeline is cooled.

[0018] Preferably, a second heat recovery device is further included, and the pipe section of the second gas outlet pipeline located between the first heat recovery device and the third heat exchanger passes through the second heat recovery device, and the pipe section between the third heat exchanger and the compressor passes through the second heat recovery device, so that the refrigerant in the second gas outlet pipeline and the refrigerant in the pipe section between the third heat exchanger and the compressor exchange heat in the second heat recovery device, and the refrigerant in the second gas outlet pipeline is cooled.

[0019] Preferably, a fifth throttling device is also provided on the pipe section of the second gas outlet pipeline located between the second heat regeneration device and the third heat exchanger, and the pipe section of the second liquid outlet pipeline located between the first heat regeneration device and the compressor is connected to the pipe section between the second heat regeneration device and the compressor.

[0020] Preferably, the first heat exchanger is an electric heating water tank; and / or, the second heat exchanger is a refrigerator or an air conditioner; and / or, the third heat exchanger is a freezer.

[0021] The integrated cooling and heating heat exchange system provided by the present invention has the following beneficial effects:

[0022] The present invention provides a first heat exchanger for releasing heat for heating, and a second heat exchanger and a third heat exchanger for absorbing heat for cooling, and adopts a mixed non-azeotropic refrigerant of three or more different boiling points, so that the mixed refrigerant can produce hot water or other in the first heat exchanger, and produce slightly lower temperature cold in the second heat exchanger for use in air conditioning refrigeration or refrigerator refrigeration, etc., and the low-boiling-point refrigerant can effectively produce lower temperature cold in the third heat exchanger for use in low-temperature freezing, etc., thereby effectively designing and manufacturing the single heating, refrigeration and other devices in the prior art into an integrated system, so that the refrigerant in the system can effectively utilize heat or cold to produce the required hot water, air cooling, freezing cooling, refrigerator cooling, etc., and effectively utilize waste heat, thereby avoiding the occurrence of large amounts of heat loss, making full use of the waste heat generated in the refrigeration process for the heating system, and improving the energy efficiency of the system. At the same time, the heating and cooling sections can work independently according to demand, with the beneficial effects of intelligent control and operation, and there is no need to equip water heaters, air conditioners, refrigeration and other heating or cooling devices with separate outdoor units, which effectively reduces the overall cost and greatly reduces the occupied area (especially commercial heating or cooling devices), realizing the effective integration of heating and cooling devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a system structure diagram of the integrated cooling and heating heat exchange system of the present invention when the water heater, refrigerator, and freezer are all working;

[0024] Figure 2 This is a system structure diagram of the integrated cooling and heating heat exchange system of the present invention when only the water heater works alone;

[0025] Figure 3 This is a system structure diagram of the integrated refrigeration and heating heat exchange system of the present invention when only refrigeration and freezing work in combination.

[0026] The reference numerals indicate:

[0027] 1. Compressor; 2. First heat exchanger; 30. First heat regeneration device; 31. Second heat regeneration device; 40. First throttling device; 41. Second throttling device; 42. Third throttling device; 43. Fourth throttling device; 44. Fifth throttling device; 50. First flash evaporator; 51. Second flash evaporator; 6. Second heat exchanger; 7. Third heat exchanger; 8. Outdoor heat exchanger; 91. First control valve; 92. Second control valve; 93. Third control valve; 94. Fourth control valve; 95. Fifth control valve; 90. Sixth control valve; 101. First branch; 102. Second branch; 103. Third branch; 104. Fourth branch; 105. Fifth branch; 106. Sixth branch; 201. First liquid outlet pipeline; 202. First gas outlet pipeline; 203. Second liquid outlet pipeline; 204. Second gas outlet pipeline. DETAILED DESCRIPTION

[0028] like Figure 1-3 As shown, the present invention provides a cooling and heating integrated heat exchange system, which includes:

[0029] A compressor 1 and a first heat exchanger 2, wherein the first heat exchanger 2 can be communicated with the exhaust port of the compressor 1 so that the refrigerant releases heat in the first heat exchanger 2;

[0030] The refrigerant is a mixed non-azeotropic refrigerant, including a low-boiling-point refrigerant, a medium-boiling-point refrigerant and a high-boiling-point refrigerant, wherein, from low to high boiling point, low-boiling-point refrigerant < medium-boiling-point refrigerant < high-boiling-point refrigerant;

[0031] The second heat exchanger 6 is further provided. One end of the second heat exchanger 6 is connectable to the air intake of the compressor 1, and the other end is connectable to the first heat exchanger 2. A first throttling device 40 is provided between the first heat exchanger 2 and the second heat exchanger 6. The high-boiling-point refrigerant can absorb heat in the second heat exchanger 6 to provide cooling.

[0032] It also includes a third heat exchanger 7, one end of which can be connected to the intake port of the compressor 1, and the other end can be connected to the first heat exchanger 2, and a second throttling device 41 is also provided between the first heat exchanger 2 and the third heat exchanger 7. The low-boiling-point refrigerant can absorb heat in the third heat exchanger 7 to cool.

[0033] The present invention provides a first heat exchanger for releasing heat for heating, and a second heat exchanger and a third heat exchanger for absorbing heat for cooling, and adopts a mixed non-azeotropic refrigerant of three or more different boiling points, so that the mixed refrigerant can produce hot water or other in the first heat exchanger, and produce slightly lower temperature cold in the second heat exchanger for use in air conditioning refrigeration or refrigerator refrigeration, etc., and the low-boiling-point refrigerant can effectively produce lower temperature cold in the third heat exchanger for use in low-temperature freezing, etc., thereby effectively designing and manufacturing the single heating, refrigeration and other devices in the prior art into an integrated system, so that the refrigerant in the system can effectively utilize heat or cold to produce the required hot water, air cooling, freezing cooling, refrigerator cooling, etc., and effectively utilize waste heat, thereby avoiding the occurrence of large amounts of heat loss, making full use of the waste heat generated in the refrigeration process for the heating system, and improving the energy efficiency of the system. At the same time, the heating and cooling sections can work independently according to demand, with the beneficial effects of intelligent control and operation, and there is no need to equip water heaters, air conditioners, refrigeration and other heating or cooling devices with separate outdoor units, which effectively reduces the overall cost and greatly reduces the occupied area (especially commercial heating or cooling devices), realizing the effective integration of heating and cooling devices.

[0034] Preferably, the heat exchanger further includes an outdoor heat exchanger 8, a first branch 101 and a second branch 102, wherein one end of the first branch 101 can be connected to the first heat exchanger 2 and the other end can be connected to the first throttling device 40, and the first branch 101 passes through the outdoor heat exchanger 8 so that the refrigerant passing through the first branch 101 can release heat in the outdoor heat exchanger 8, and a third control valve 93 is provided on the first branch 101;

[0035] One end of the second branch 102 can be connected to the intake port of the compressor 1, and the other end can be connected to the second heat exchanger 6 or the third heat exchanger 7. The second branch 102 also passes through the outdoor heat exchanger 8 so that the refrigerant passing through the second branch 102 can absorb heat in the outdoor heat exchanger 8. A fourth control valve 94 is provided on the second branch 102.

[0036] This is a further preferred structural form of the integrated cooling and heating heat exchange system of the present invention, that is, by setting up an outdoor heat exchanger, the refrigerant can effectively exchange heat with the outdoor air, and the first heat exchanger for heating, the second heat exchanger for cooling and the third heat exchanger can be effectively supplemented with cold / heat, so that the heat release / heat absorption of the entire system is balanced, effectively ensuring the heat release of the first heat exchanger and the cooling of the second and third heat exchangers normally, and the outdoor heat exchanger can work in conjunction with the first heat exchanger, and the heat absorption of the first heat exchanger can be achieved through the heat absorption of the outdoor heat exchanger. The outdoor heat exchanger can realize the function of producing heat (such as hot water) by the heat exchanger alone, and can work in conjunction with the second heat exchanger and / or the third heat exchanger through the outdoor heat exchanger, can realize the function of the second heat exchanger producing cold energy (such as refrigerator refrigeration) by the heat release of the outdoor heat exchanger, can realize the function of the third heat exchanger producing cold energy (such as low-temperature freezing or low-temperature cold storage) by the heat release of the outdoor heat exchanger, or can realize the function of the third heat exchanger producing cold energy (such as low-temperature freezing or low-temperature cold storage) by the heat release of the outdoor heat exchanger and realize the function of the second heat exchanger producing cold energy (such as refrigerator refrigeration) at the same time.

[0037] Preferably, it also includes a third branch 103 and a fourth branch 104, the third branch 103 is connected in parallel with the first branch 101, and a second control valve 92 is provided on the third branch 103, the fourth branch 104 is connected in parallel with the second branch 102, and a fifth control valve 95 is provided on the fourth branch 104. By setting the third branch and the second control valve in parallel with the first branch, the heat release branch of the outdoor heat exchanger can be effectively controlled to be short-circuited in parallel, so that when the outdoor heat exchanger needs to release heat, the control valve of the first branch where the outdoor heat exchanger is located is opened and the second control valve on the third branch is closed; when the outdoor heat exchanger needs to be closed to release heat, the control valve of the branch where the outdoor heat exchanger is located is closed, the second control valve on the third branch is opened, and a short circuit of the first branch is formed; by setting the fourth branch and the fifth control valve in parallel with the second branch, the heat absorption branch of the outdoor heat exchanger can be effectively controlled to be short-circuited in parallel, so that when the outdoor heat exchanger needs to absorb heat, the control valve of the second branch where the outdoor heat exchanger is located is opened and the fifth control valve on the fourth branch is closed; when the outdoor heat exchanger needs to be closed to absorb heat, the control valve of the second branch where the outdoor heat exchanger is located is closed, the fifth control valve on the fourth branch is opened, and a short circuit of the second branch is formed; thereby, the outdoor heat exchanger can be intelligently controlled to release heat, absorb heat, or be completely closed according to the needs of heating and cooling, thereby realizing intelligent control of the integrated heat exchange system.

[0038] Preferably, the pipeline where the first heat exchanger 2 is located is a fifth branch 105, on which a sixth control valve 90 is provided. A sixth branch 106 is also provided in parallel with the fifth branch 105, and the sixth branch 106 is provided with a first control valve 91. By means of the sixth branch provided in parallel with the fifth branch, as well as the first and sixth control valves, the first heat exchanger can be effectively controlled to operate for heating when required. When the first heat exchanger is not required to operate, the sixth control valve is closed and the first control valve is opened, effectively short-circuiting the first heat exchanger and realizing multiple cooling and heating switching functions.

[0039] Preferably, a first flash evaporator 50 is further disposed between the first throttling device 40 and the second heat exchanger 6. The input end of the first flash evaporator 50 is connected to the first throttling device 40. The second heat exchanger 6 is disposed on the first liquid outlet pipeline 201 of the first flash evaporator 50, and the second throttling device 41 is disposed on the first gas outlet pipeline 202 of the first flash evaporator 50. Furthermore, a third throttling device 42 is further disposed on the section of the first liquid outlet pipeline 201 between the first flash evaporator 50 and the second heat exchanger 6. This is a further preferred structural form of the present invention, whereby the first flash evaporator effectively separates the high-boiling-point refrigerant from the low-boiling-point refrigerant and the medium-boiling-point refrigerant, allowing the high-boiling-point refrigerant to be separated first and then enter the second heat exchanger for effective cooling and heat absorption, thereby generating a corresponding amount of cooling energy. Due to the high boiling point of this refrigerant, the cooling energy generated is at a slightly higher temperature and is typically used for refrigerator refrigeration or indoor air conditioning.

[0040] Preferably, a second flash evaporator 51 is further included, the first gas outlet pipeline 202 is connected to the input end of the second flash evaporator 51, and the second throttling device 41 is provided on the first gas outlet pipeline 202, and the second gas outlet pipeline 204 of the second flash evaporator 51 can be connected to the third heat exchanger 7;

[0041] A fourth throttling device 43 is provided on the second liquid outlet pipeline 203 of the second flash evaporator 51 , and the liquid outlet pipeline of the second flash evaporator 51 can also be connected to the air intake of the compressor 1 .

[0042] This is a further preferred structural form of the present invention. Through the arrangement of the second flash evaporator, the medium-boiling point refrigerant and the low-boiling point refrigerant entering the first gas outlet pipeline can be further separated. The medium-boiling point refrigerant is first condensed into liquid and precipitated and enters the second liquid outlet pipeline, and the low-boiling point refrigerant enters the second gas outlet pipeline. The low-boiling point refrigerant then enters the third heat exchanger for cooling and heat absorption. Since this refrigerant has the highest boiling point, the temperature of the cooling capacity produced is the lowest, and it is usually used in low-temperature cold storage or low-temperature freezer, etc. The separated medium-boiling point refrigerant can be returned to the compressor intake port after cooling and heat absorption through the outdoor heat exchanger to complete the entire cycle process of the system.

[0043] Preferably, the system further includes a first reheat device 30. The second gas outlet pipeline 204 extends through the first reheat device 30, and the section of the second liquid outlet pipeline 203 located between the fourth throttling device 43 and the compressor 1 extends through the first reheat device 30. This allows the refrigerant in the second gas outlet pipeline 204 and the refrigerant in the second liquid outlet pipeline 203 to exchange heat in the first reheat device 30, cooling the refrigerant in the second gas outlet pipeline 204. The provision of the first reheat device effectively reduces the temperature of the low-boiling-point refrigerant in the second gas outlet pipeline, further lowering the temperature of the refrigerant entering the third heat exchanger and increasing the cooling capacity of the third heat exchanger.

[0044] Preferably, a second reheat device 31 is further included. The section of the second gas outlet pipeline 204 between the first reheat device 30 and the third heat exchanger 7 passes through the second reheat device 31, and the section between the third heat exchanger 7 and the compressor 1 passes through the second reheat device 31. This allows the refrigerant in the second gas outlet pipeline 204 to exchange heat with the refrigerant in the section between the third heat exchanger 7 and the compressor 1 in the second reheat device 31, cooling the refrigerant in the second gas outlet pipeline 204. The second reheat device can further reduce the temperature of the low-boiling-point refrigerant in the second gas outlet pipeline, further lowering the temperature of the refrigerant entering the third heat exchanger, thereby increasing the cooling capacity of the third heat exchanger and the temperature of the refrigerant exiting the third heat exchanger. This increases the compressor's inlet temperature and prevents liquid hammer.

[0045] Preferably, a fifth throttling device 44 is further provided on the section of the second gas outlet pipeline 204 between the second reheat device 31 and the third heat exchanger 7. The section of the second liquid outlet pipeline 203 between the first reheat device 30 and the compressor 1 is connected to the section of the pipeline between the second reheat device 31 and the compressor 1. This is a further preferred structural form of the present invention. The fifth throttling device can throttle and reduce the pressure of the low-boiling-point refrigerant before entering the third heat exchanger, converting it into a liquid state, thereby completing heat absorption and phase change heat transfer in the third heat exchanger. The medium-boiling-point refrigerant exiting the second liquid outlet pipeline can be mixed with the low-boiling-point refrigerant exiting the second reheat device before returning to the compressor.

[0046] Preferably, the first heat exchanger 2 is an electrically heated water tank; and / or the second heat exchanger 6 is a refrigerator or air conditioner; and / or the third heat exchanger 7 is a freezer. The first heat exchanger is an electrically heated water tank, capable of producing hot water through the heat release of the refrigerant. The second heat exchanger flows through a high-boiling-point refrigerant, capable of producing slightly higher-temperature cooling, typically for refrigerator refrigeration or indoor air conditioning. The third heat exchanger flows through a low-boiling-point refrigerant, capable of producing very low-temperature cooling for freezing.

[0047] The system of the present invention adopts three refrigerants with different boiling points, namely high, medium and low boiling point refrigerants.

[0048] 1. The water heater, refrigerator and freezer are working at the same time

[0049] like Figure 1 As shown, the first control valve 91, the third control valve 93 and the fifth control valve 95 are closed, and the sixth control valve 90, the second control valve 92 and the fourth control valve 94 are opened (the above control valves are preferably electric valves). The three mixed non-azeotropic refrigerants are converted into high-temperature and high-pressure gases in the compressor and then enter the water tank (first heat exchanger 2). They condense in the water tank and release heat to heat the low-temperature water in the water tank. The high-temperature and high-pressure liquid mixed refrigerant flowing out of the water tank passes through the first throttling device 40 (preferably an electronic expansion valve). The function of the first throttling device 40 is to reduce the temperature of the mixed refrigerant to a reasonable range by reasonably controlling the number of steps of the electronic expansion valve, so that the high-boiling-point refrigerant precipitates in liquid form, and then the gas-liquid mixed refrigerant flows into the first flash evaporator 50, and the high-boiling-point refrigerant is stored in liquid form at the bottom of the first flash evaporator 50. The high-boiling-point refrigerant flows through a third throttling device 42 (preferably an electronic expansion valve) into the evaporator (second heat exchanger 6). This throttling device 42 regulates the flow of the high-boiling-point refrigerant to accommodate changes in the refrigeration load. The high-boiling-point refrigerant evaporates within the refrigerator (second heat exchanger 6), absorbing heat and generating refrigeration, thereby achieving refrigeration within the refrigerator.

[0050] The mixture of medium- and low-temperature refrigerants flows in a gaseous state through the second throttling device 41 (preferably an electronic expansion valve). The second throttling device 41 functions similarly to the first throttling device 40: by controlling the number of steps of the electromagnetic expansion valve, it lowers the temperature to an appropriate range, separating the medium- and low-temperature refrigerants into a gaseous liquid. The medium-temperature refrigerant is stored in liquid form at the bottom of the second flash evaporator 51 and then flows through the fourth throttling device 43 (preferably an electronic expansion valve) to the first regenerator 30. The low-temperature refrigerant condenses and releases heat in the first regenerator 30, while the medium-temperature refrigerant evaporates and absorbs heat in the first regenerator 30, returning to a gaseous state. After flowing through the second regenerator 31, the low-temperature refrigerant passes through the fifth throttling device (preferably an electronic expansion valve) and is throttled again to a low-temperature, low-pressure liquid refrigerant. It then flows into the evaporator, absorbing heat and cooling the space required for refrigeration (the third heat exchanger 7), achieving the desired refrigeration goal. Finally, all refrigerants are combined into a single flow path, passing through the outdoor heat exchanger 8 and into the compressor.

[0051] The first heat recovery device 30 provides a cooling source for the low-temperature refrigerant. Since low-temperature refrigerants are difficult to condense into a liquid using cooling water or ambient air, artificial energy is required. However, the evaporation of medium- and high-boiling-point refrigerants provides a cooling source for the condensation of the low-boiling-point refrigerant, improving energy efficiency.

[0052] The function of the second regenerator 31 is to increase the superheat of the refrigerant flowing into the compressor.

[0053] In order to adapt to load changes and meet the heating capacity under different conditions, air-energy water heaters should use electric-assisted hot water tanks.

[0054] 2. When the water heater only needs to work alone

[0055] like Figure 2 As shown, the first control valve 91, the third control valve 93, and the fifth control valve 95 are closed, the sixth control valve 90, the second control valve 92, and the fourth control valve 94 are open (the above control valves are preferably electric valves), and the third throttling device 42 and the fifth throttling device 44 are closed. At this time, the integrated system is a heat pump independent circulation system, and the refrigerant circuit is represented by a solid line in the figure. The high-boiling point refrigerant is stored in liquid form at the bottom of the first flash evaporator 50. The outdoor heat exchanger 8 acts as an outdoor evaporator, absorbing heat from the external environment. After being compressed into a high-temperature, high-pressure gas by the compressor, the refrigerant condenses and releases heat in the first heat exchanger 2 (preferably a water heater). It is then throttled by the electronic expansion valve (the first throttling device 40 and the second throttling device 41) to form a low-temperature, low-pressure gas-liquid two-phase mixture. After absorbing heat in the evaporator, the refrigerant returns to a gaseous state and finally flows into the compressor 1 for further compression before the next cycle begins.

[0056] 3. When only refrigeration and freezing chambers need to work together

[0057] like Figure 3 As shown, the first control valve 91, the third control valve 93, and the fifth control valve 95 are open, and the sixth control valve 90, the second control valve 92, and the fourth control valve 94 are closed (these control valves are preferably electric valves). The refrigerant circuit is represented by solid lines in the figure. At this time, the outdoor heat exchanger 8 acts as an outdoor condenser. After being compressed into a high-temperature, high-pressure gas by the compressor, the refrigerant condenses and releases heat in the outdoor heat exchanger 8. It is then throttled by the electronic expansion valve to a low-temperature, low-pressure liquid. It then absorbs heat and cools into a gaseous state in the cooling and freezing chambers. Finally, it flows into the compressor 1 for further compression, starting the next cycle.

[0058] In the above optimal implementation scheme, any conventional refrigeration (refrigerator, air conditioner, etc.) can be achieved through the refrigeration space (second heat exchanger 6), and any ultra-low temperature refrigeration (freezing, refrigeration, etc.) can be achieved through the freezer (third heat exchanger 7).

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A refrigeration and heating integrated heat exchange system, characterized in that: include: A compressor (1) and a first heat exchanger (2), wherein the first heat exchanger (2) can be communicated with an exhaust port of the compressor (1) so that the refrigerant releases heat in the first heat exchanger (2); The refrigerant is a mixed non-azeotropic refrigerant, including a low boiling point refrigerant, a medium boiling point refrigerant and a high boiling point refrigerant, wherein from low to high boiling point, low boiling point refrigerant < medium boiling point refrigerant < high boiling point refrigerant; The invention also comprises a second heat exchanger (6), one end of which can be connected to the air intake port of the compressor (1), and the other end of which can be connected to the first heat exchanger (2), and a first throttling device (40) is provided between the first heat exchanger (2) and the second heat exchanger (6), and the high-boiling-point refrigerant can absorb heat in the second heat exchanger (6) to cool the air; The invention also comprises a third heat exchanger (7), one end of the third heat exchanger (7) being connectable to the air intake port of the compressor (1), and the other end of the third heat exchanger (7) being connectable to the first heat exchanger (2), and a second throttling device (41) being arranged between the first heat exchanger (2) and the third heat exchanger (7), and the low boiling point refrigerant being able to absorb heat in the third heat exchanger (7) to provide cooling; It also comprises an outdoor heat exchanger (8), a first branch (101) and a second branch (102); one end of the first branch (101) is connectable to the first heat exchanger (2), and the other end is connectable to the first throttling device (40); the first branch (101) passes through the outdoor heat exchanger (8) so that the refrigerant passing through the first branch (101) can release heat in the outdoor heat exchanger (8); and a third control valve (93) is provided on the first branch (101); One end of the second branch (102) can be connected to the air intake port of the compressor (1), and the other end can be connected to the second heat exchanger (6) or the third heat exchanger (7); the second branch (102) also passes through the outdoor heat exchanger (8), so that the refrigerant passing through the second branch (102) can absorb heat in the outdoor heat exchanger (8); and a fourth control valve (94) is provided on the second branch (102); A first flash evaporator (50) is also provided between the first throttling device (40) and the second heat exchanger (6), and also includes a second flash evaporator (51), wherein the input end of the second flash evaporator (51) is connected to the first gas outlet pipeline (202) of the first flash evaporator (50) through the second throttling device (41), and the second gas outlet pipeline (204) of the second flash evaporator (51) is connected to the third heat exchanger (7).

2. The integrated refrigeration and heating heat exchange system according to claim 1, characterized in that: The invention also comprises a third branch (103) and a fourth branch (104), wherein the third branch (103) is connected in parallel with the first branch (101), and a second control valve (92) is arranged on the third branch (103), and the fourth branch (104) is connected in parallel with the second branch (102), and a fifth control valve (95) is arranged on the fourth branch (104).

3. The integrated refrigeration and heating heat exchange system according to claim 1, characterized in that: The pipeline where the first heat exchanger (2) is located is a fifth branch (105), a sixth control valve (90) is provided on the fifth branch (105), and a sixth branch (106) is further provided in parallel with the fifth branch (105), and a first control valve (91) is provided on the sixth branch (106).

4. The integrated refrigeration and heating heat exchange system according to claim 1, characterized in that: The input end of the first flash evaporator (50) is connected to the first throttling device (40); the second heat exchanger (6) is arranged on the first liquid outlet pipeline (201) of the first flash evaporator (50); the second throttling device (41) is arranged on the first gas outlet pipeline (202) of the first flash evaporator (50); and a third throttling device (42) is also arranged on the pipe section of the first liquid outlet pipeline (201) between the first flash evaporator (50) and the second heat exchanger (6).

5. The integrated refrigeration and heating heat exchange system according to claim 4, characterized in that: A fourth throttling device (43) is provided on the second liquid outlet pipeline (203) of the second flash evaporator (51), and the liquid outlet pipeline of the second flash evaporator (51) can also be connected to the air intake port of the compressor (1).

6. The integrated refrigeration and heating heat exchange system according to claim 5, characterized in that: The invention also comprises a first heat recovery device (30), wherein the second gas outlet pipeline (204) passes through the first heat recovery device (30), and the pipe section of the second liquid outlet pipeline (203) located between the fourth throttling device (43) and the compressor (1) passes through the first heat recovery device (30), so that the refrigerant in the second gas outlet pipeline (204) and the refrigerant in the second liquid outlet pipeline (203) exchange heat in the first heat recovery device (30), and the refrigerant in the second gas outlet pipeline (204) is cooled.

7. The integrated refrigeration and heating heat exchange system according to claim 6, characterized in that: The system further comprises a second heat recovery device (31), wherein the pipe section of the second gas outlet pipeline (204) located between the first heat recovery device (30) and the third heat exchanger (7) passes through the second heat recovery device (31), and the pipe section between the third heat exchanger (7) and the compressor (1) passes through the second heat recovery device (31), so that the refrigerant in the second gas outlet pipeline (204) and the refrigerant in the pipe section between the third heat exchanger (7) and the compressor (1) exchange heat in the second heat recovery device (31), and the refrigerant in the second gas outlet pipeline (204) is cooled down.

8. The integrated cooling and heating heat exchange system according to claim 7, characterized in that: A fifth throttling device (44) is also provided on the pipe section of the second gas outlet pipeline (204) located between the second heat regeneration device (31) and the third heat exchanger (7), and the pipe section of the second liquid outlet pipeline (203) located between the first heat regeneration device (30) and the compressor (1) is connected to the pipe section between the second heat regeneration device (31) and the compressor (1).

9. The integrated refrigeration and heating heat exchange system according to any one of claims 1 to 8, characterized in that: The first heat exchanger (2) is an electric heating water tank; and / or the second heat exchanger (6) is a refrigerator or an air conditioner; and / or the third heat exchanger (7) is a freezer.

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