Air conditioning system

Abstract

The invention provides an air conditioning system. The air conditioning system comprises two heat exchangers, a compressor assembly, a gas-liquid separator and a pipeline. The compressor assembly conveys refrigerants to one heat exchanger through a pipeline, the heat exchanger conveys refrigerants to the gas-liquid separator through a pipeline, the gas-liquid separator conveys gaseous refrigerants to the compressor assembly through a pipeline, and the gas-liquid separator conveys liquid refrigerants to the other heat exchanger through a pipeline. And the heat exchanger conveys a refrigerant to the compressor assembly through a pipeline. The refrigerant enters the evaporator in a full-liquid mode, the possibility of uneven liquid separation of two-phase flow can be remarkably reduced, the micro-channel heat exchanger is particularly suitable for an air-conditioning system using a micro-channel heat exchanger, the pressure drop of the evaporator can be reduced, the suction pressure is increased, the risk of negative pressure is reduced, the safety of the air-conditioning system is improved, and the service life of the air-conditioning system is prolonged. The R290 refrigerant is especially suitable for an air conditioning system using R290 as a refrigerant.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system. Background Art

[0002] Refrigerant, also known as refrigerant or snow seed, is a working fluid used to transfer heat energy and produce a refrigeration effect in systems such as refrigeration and air conditioning. With the advancement of environmental protection regulations, refrigerants with low ODP values ​​(ozone depletion potential) and low GWP values ​​(global warming potential) have gradually become mainstream to reduce damage to the ozone layer. R290 is commonly known as propane. The ozone depletion potential (ODP) of R290 refrigerant is zero, which means that R290 has no destructive effect on the ozone layer, so it is considered an environmentally friendly refrigerant. R290 has high thermal conductivity. At the same time, R290 is a by-product of the petrochemical process, so it is a relatively cheap and easily available refrigerant. R290 is being widely studied and is very likely to be vigorously promoted as a refrigerant for air-conditioning systems in the future.

[0003] However, the air conditioning system using R290 as refrigerant has low pressure, low density, high flow rate and high flow resistance, which causes a very large pressure loss in the heat exchanger, especially in the evaporator, which increases the compression ratio of the compressor and leads to increased energy consumption. In addition, the air conditioning system using R290 as refrigerant has low pressure, and it may even be lower than the atmospheric pressure on the suction side, which increases the risk of air leakage into the air conditioning system, and even causes an explosion in severe cases; at the same time, the pressure of the air conditioning system is low, and the suction pressure is also low. Too low suction pressure may also cause the lubricating oil in the suction pipe to solidify. Furthermore, due to the flammable and explosive characteristics of R290, the R290 refrigerant charge of the air conditioning system is restricted by corresponding regulations. Therefore, the air conditioning system is designed to keep the volume as small as possible. The microchannel heat exchanger is a good choice. However, for the evaporator, the inlet refrigerant state is usually two-phase (gas phase and liquid phase). At this time, the use of a microchannel heat exchanger often involves the problem of uneven liquid separation of the two-phase flow, and the uneven liquid separation of the two-phase flow will significantly reduce the performance of the microchannel heat exchanger. Summary of the invention

[0004] The object of the present invention is to provide an air-conditioning system, in which the refrigerant enters the evaporator in a fully liquid manner, which can significantly reduce the possibility of uneven liquid separation of the two-phase flow. The system is particularly suitable for air-conditioning systems using microchannel heat exchangers. In addition, the pressure drop of the evaporator can be reduced, so that the suction pressure is increased, the risk of negative pressure is reduced, and the safety of the air-conditioning system is improved. The system is particularly suitable for air-conditioning systems using R290 as the refrigerant.

[0005] In order to achieve the above-mentioned object, the present invention provides an air conditioning system, which comprises: two heat exchangers, a compressor assembly, a gas-liquid separator and a pipeline;

[0006] The compressor assembly transports refrigerant to one of the heat exchangers through a pipeline, and the heat exchanger transports refrigerant to the gas-liquid separator through the pipeline, the gas-liquid separator transports gaseous refrigerant to the compressor assembly through the pipeline, the gas-liquid separator transports liquid refrigerant to another heat exchanger through the pipeline, and the heat exchanger transports refrigerant to the compressor assembly through the pipeline.

[0007] Optionally, the refrigerant delivered by another heat exchanger to the compressor assembly and the gaseous refrigerant delivered by the gas-liquid separator to the compressor assembly first merge in the pipeline and then enter the compressor assembly.

[0008] Optionally, the air conditioning system includes a first reversing valve and a second reversing valve arranged on the pipeline.

[0009] Optionally, the first reversing valve and the second reversing valve are both four-way reversing valves.

[0010] Optionally, the pipeline includes an air outlet pipe, a liquid outlet pipe, a first input pipe, a first pipeline, a second pipeline, a third pipeline, an output pipe, a second input pipe, a fourth pipeline and a fifth pipeline, and the two heat exchangers are respectively a first heat exchanger and a second heat exchanger; the first heat exchanger is connected to the second reversing valve through the first pipeline, the gas-liquid separator is connected to the second reversing valve through the first input pipe, the gas-liquid separator is connected to the air outlet pipe, the gas-liquid separator is connected to the second reversing valve through the liquid outlet pipe, the second heat exchanger is connected to the second reversing valve through the second pipeline, the second heat exchanger is connected to the first reversing valve through the third pipeline, the compressor assembly is connected to the first reversing valve through the output pipe, the first reversing valve is connected to the fourth pipeline, the compressor assembly is connected to the second input pipe, the second input pipe, the fourth pipeline and the air outlet pipe are connected to each other, and the first heat exchanger is connected to the first reversing valve through the fifth pipeline.

[0011] Optionally, during refrigeration, the second reversing valve connects the first pipeline with the first input pipeline, and connects the liquid outlet pipeline with the second pipeline, and the first reversing valve connects the third pipeline and the fourth pipeline, and connects the output pipeline with the fifth pipeline.

[0012] Optionally, during heating, the second reversing valve connects the second pipeline with the first input pipeline, and connects the liquid outlet pipeline with the first pipeline, and the first reversing valve connects the output pipeline with the third pipeline, and connects the fifth pipeline with the fourth pipeline.

[0013] Optionally, the air-conditioning system includes a throttling device, and the throttling device is arranged on the first inlet pipe.

[0014] Optionally, the compressor assembly includes a compressor body and a liquid reservoir connected by a pipeline, an inlet end of the liquid reservoir is connected to the pipeline, and an outlet end of the compressor body is connected to the pipeline.

[0015] Optionally, when one of the heat exchangers functions as a condenser, the other heat exchanger functions as an evaporator; conversely, when one of the heat exchangers functions as an evaporator, the other heat exchanger functions as a condenser.

[0016] As configured above, a heat exchanger is used as a condenser, and the refrigerant output by the heat exchanger enters the gas-liquid separator in a two-phase state after being throttled by the throttling device for gas-liquid separation. The separated gaseous refrigerant enters the compressor assembly, and the separated liquid refrigerant enters another heat exchanger used as an evaporator. In this way, the refrigerant enters the evaporator in a fully liquid manner, which greatly reduces the possibility of uneven liquid separation of the two-phase flow, and is particularly suitable for air-conditioning systems using microchannel heat exchangers; and the separated gaseous refrigerant directly enters the compressor assembly without entering the evaporator, and only the liquid refrigerant flows in the evaporator, which can reduce the pressure loss in the evaporator, so that the suction pressure is increased, and the probability of solidification of the lubricating oil in the pipeline and the risk of negative pressure in the air-conditioning system can be reduced, and the safety of the air-conditioning system is improved, which is particularly suitable for air-conditioning systems using R290 as a refrigerant; in addition, the addition of the gas-liquid separator plays a role in buffering the suction state of the compressor assembly. Further, the heat exchanger of the present invention can be used as a condenser and an evaporator, and with the first reversing valve and the second reversing valve, both cooling and heating can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Those skilled in the art should understand that the drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0018] Figure 1 A schematic diagram of the refrigerant flow direction during cooling of an air-conditioning system according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of refrigerant flow during heating of an air-conditioning system according to an embodiment of the present invention.

[0020] The reference numerals are as follows:

[0021] 1-compressor assembly; 11-output pipe; 12-compressor body; 13-liquid reservoir; 14-second input pipe; 2-gas-liquid separator; 21-gas outlet pipe; 22-liquid outlet pipe; 23-first input pipe; 31-first reversing valve; 311-fourth pipeline; 32-second reversing valve; 41-first heat exchanger; 411-first pipeline; 412-fifth pipeline; 42-second heat exchanger; 421-third pipeline; 422-second pipeline; 5-throttling device. DETAILED DESCRIPTION

[0022] In this document, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "top", "bottom", etc. are used to indicate directions or positional relationships based on the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction and operation. Therefore, they cannot be understood as limiting the present invention.

[0023] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] Figure 1 is a schematic diagram of the refrigerant flow direction during cooling of an air-conditioning system according to an embodiment of the present invention, Figure 2 This is a schematic diagram of the refrigerant flow direction of the air conditioning system during heating according to an embodiment of the present invention. Figure 1 and Figure 2 , an embodiment of the present invention provides an air conditioning system, which includes two heat exchangers, a compressor assembly 1, a gas-liquid separator 2 and a pipeline.

[0025] The compressor assembly 1 delivers refrigerant to a heat exchanger through a pipeline, and the heat exchanger delivers refrigerant to the gas-liquid separator 2 through a pipeline, the gas-liquid separator 2 delivers gaseous refrigerant to the compressor assembly 1 through a pipeline, the gas-liquid separator 2 delivers liquid refrigerant to another heat exchanger through a pipeline, and the heat exchanger delivers refrigerant to the compressor assembly 1 through a pipeline. Furthermore, the refrigerant delivered by another heat exchanger to the compressor assembly 1 and the gaseous refrigerant delivered by the gas-liquid separator 2 to the compressor assembly 1 first merge in the pipeline and then enter the compressor assembly 1.

[0026] Preferably, the air conditioning system includes a first reversing valve 31 and a second reversing valve 32 arranged on the pipeline. The first reversing valve 31 and the second reversing valve 32 can both be four-way reversing valves. The introduction of the four-way reversing valve enables both cooling and heating to be achieved in the air conditioning system of the present invention. It is understandable that when one heat exchanger acts as a condenser, the other heat exchanger acts as an evaporator; conversely, when one heat exchanger acts as an evaporator, the other heat exchanger acts as a condenser. In this way, with the reversing valve, cooling and heating can be achieved.

[0027] For example, the pipeline includes an air outlet pipe 21, a liquid outlet pipe 22, a first input pipe 23, a first pipeline 411, a second pipeline 422, a third pipeline 421, an output pipe 11, a second input pipe 14, a fourth pipeline 311 and a fifth pipeline 412, and the two heat exchangers are a first heat exchanger 41 and a second heat exchanger 42 respectively; the first heat exchanger 41 is connected to the second reversing valve 32 through the first pipeline 411, the gas-liquid separator 2 is connected to the second reversing valve 32 through the first input pipe 23, the gas-liquid separator 2 is connected to the air outlet pipe 21, and the gas-liquid separator 2 is connected to the gas outlet pipe 21 through the first input pipe 23. The liquid outlet pipe 22 is connected to the second reversing valve 32, the second heat exchanger 42 is connected to the second reversing valve 32 through the second pipe 422, the second heat exchanger 42 is connected to the first reversing valve 31 through the third pipe 421, the compressor assembly 1 is connected to the first reversing valve 31 through the output pipe 11, the first reversing valve 31 is connected to the fourth pipe 311, the compressor assembly 1 is connected to the second input pipe 14, the second input pipe 14, the fourth pipe 311 and the air outlet pipe 21 are connected, and the first heat exchanger 41 is connected to the first reversing valve 31 through the fifth pipe 412. Further, the air conditioning system includes a throttling device 5, which is arranged on the first input pipe 23.

[0028] During cooling, the second reversing valve 32 connects the first pipe 411 with the first input pipe 23 , and connects the liquid outlet pipe 22 with the second pipe 422 ; the first reversing valve 31 connects the third pipe 421 with the fourth pipe 311 , and connects the output pipe 11 with the fifth pipe 412 . It can be understood that the compressor assembly 1 outputs the refrigerant through the output pipe 11, and the refrigerant then enters the first heat exchanger 41 through the fifth pipe 412. At this time, the first heat exchanger 41 is used as a condenser. The refrigerant output by the first heat exchanger 41 enters the first input pipe 23 after passing through the second reversing valve 32, and then is throttled by the throttling device 5, and then enters the gas-liquid separator 2. After gas-liquid separation, the gaseous refrigerant in the gas-liquid separator 2 enters the outlet pipe 21, and the liquid refrigerant in the gas-liquid separator 2 enters the liquid outlet pipe 22, and then enters the second pipe 422 after passing through the second reversing valve 32, and then enters the second heat exchanger 42. At this time, the second heat exchanger 42 is used as an evaporator. The refrigerant output by the second heat exchanger 42 enters the third pipe 421, and then enters the fourth pipe 311 after passing through the first reversing valve 31. The refrigerant in the fourth pipe 311 merges with the refrigerant in the outlet pipe 21 and enters the second input pipe 14, thereby entering the compressor assembly 1. When the outlet superheat of the evaporator (the second heat exchanger 42 is used as the evaporator at this time) is too large, the gaseous refrigerant in the outlet pipe 21 (which should be saturated gas at this time) merges with the refrigerant in the fourth pipe 311, which can reduce the suction superheat of the compressor assembly to a certain extent and increase the flow rate; when the outlet dryness of the evaporator is too small, the gaseous refrigerant in the outlet pipe 21 (which should be saturated gas at this time) merges with the refrigerant in the fourth pipe 311, which can reduce the suction liquid of the compressor assembly to a certain extent and improve the efficiency of the compressor assembly.

[0029] During heating, the second reversing valve 32 connects the second pipe 422 with the first input pipe 23 , and connects the liquid outlet pipe 22 with the first pipe 411 ; the first reversing valve 31 connects the output pipe 11 with the third pipe 421 , and connects the fifth pipe 412 with the fourth pipe 311 . It can be understood that the compressor assembly 1 outputs the refrigerant through the output pipe 11. After passing through the first reversing valve 31, the refrigerant enters the second heat exchanger 42 through the third pipe 421. At this time, the second heat exchanger 42 is used as a condenser. The refrigerant output by the second heat exchanger 42 enters the first input pipe 23 after passing through the second reversing valve 32, and then is throttled by the throttling device 5, and then enters the gas-liquid separator 2. After gas-liquid separation, the gaseous refrigerant in the gas-liquid separator 2 enters the outlet pipe 21, and the liquid refrigerant in the gas-liquid separator 2 enters the liquid outlet pipe 22, and then enters the first pipe 411 after passing through the second reversing valve 32, thereby entering the first heat exchanger 41. At this time, the first heat exchanger 41 is used as an evaporator. The refrigerant output by the first heat exchanger 41 enters the fifth pipe 412, and then enters the fourth pipe 311 after passing through the first reversing valve 31. The refrigerant in the fourth pipe 311 merges with the refrigerant in the outlet pipe 21 and enters the second input pipe 14, thereby entering the compressor assembly 1. When the outlet superheat of the evaporator (the first heat exchanger 41 is used as the evaporator at this time) is too high, the gaseous refrigerant in the outlet pipe 21 (should be saturated gas at this time) merges with the refrigerant in the fourth pipe 311, which can reduce the suction superheat of the compressor assembly to a certain extent and increase the flow rate; when the outlet dryness of the evaporator is too low, the gaseous refrigerant in the outlet pipe 21 (should be saturated gas at this time) merges with the refrigerant in the fourth pipe 311, which can reduce the suction liquid of the compressor assembly to a certain extent and improve the efficiency of the compressor assembly. In this way, the setting of the gas-liquid separator plays a role in buffering the suction state of the compressor assembly.

[0030] The compressor assembly 1 includes a compressor body 12 and a liquid reservoir 13 connected by a pipeline. The inlet end of the liquid reservoir 13 is connected to the pipeline for receiving the refrigerant, and the outlet end of the compressor body 12 is connected to the pipeline for outputting the refrigerant.

[0031] Optionally, as configured above, a heat exchanger is used as a condenser, and the refrigerant output by the heat exchanger first enters the gas-liquid separator 2 for gas-liquid separation, and the separated gaseous refrigerant enters the compressor assembly 1, and the separated liquid refrigerant enters another heat exchanger used as an evaporator. In this way, the refrigerant enters the evaporator in a fully liquid manner, which greatly reduces the possibility of uneven liquid separation of the two-phase flow, and is particularly suitable for air-conditioning systems using microchannel heat exchangers; and the separated gaseous refrigerant directly enters the compressor assembly 1 without entering the evaporator, and only the liquid refrigerant flows in the evaporator, which can reduce the pressure drop of the evaporator, reduce the pressure loss in the evaporator, and increase the suction pressure, which can reduce the probability of solidification of the lubricating oil in the pipeline and the risk of negative pressure in the air-conditioning system, and improve the safety of the air-conditioning system, and is particularly suitable for air-conditioning systems using R290 as a refrigerant; further, the heat exchanger of the present invention can be used as a condenser and an evaporator, and with the first reversing valve 31 and the second reversing valve 32, both cooling and heating can be achieved.

[0032] It should be noted that references to "one embodiment", "an embodiment", "a specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiment may include a particular feature, structure or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it is within the knowledge of a person skilled in the relevant art to implement such feature, structure or characteristic in conjunction with other embodiments.

[0033] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0034] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0035] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0036] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not intended to limit the scope of the invention. It should be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have the definition of a logical "or", rather than a logical "exclusive or", unless the context clearly indicates otherwise. In addition, the implementation of the method and / or device in the embodiments of the present invention may include performing the selected task manually, automatically, or in combination.

Claims

1. An air conditioning system, characterized in that: include: two heat exchangers, compressor assembly, gas-liquid separator and piping; The compressor assembly transports refrigerant to one of the heat exchangers through a pipeline, and the heat exchanger transports refrigerant to the gas-liquid separator through the pipeline, the gas-liquid separator transports gaseous refrigerant to the compressor assembly through the pipeline, the gas-liquid separator transports liquid refrigerant to another heat exchanger through the pipeline, and the heat exchanger transports refrigerant to the compressor assembly through the pipeline.

2. The air conditioning system according to claim 1, characterized in that: The refrigerant delivered by the other heat exchanger to the compressor assembly and the gaseous refrigerant delivered by the gas-liquid separator to the compressor assembly first merge in the pipeline and then enter the compressor assembly.

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system includes a first reversing valve and a second reversing valve arranged on the pipeline.

4. The air conditioning system according to claim 3, characterized in that: The first reversing valve and the second reversing valve are both four-way reversing valves.

5. The air conditioning system according to claim 3, characterized in that: The pipeline includes an air outlet pipe, a liquid outlet pipe, a first input pipe, a first pipeline, a second pipeline, a third pipeline, an output pipe, a second input pipe, a fourth pipeline and a fifth pipeline. The two heat exchangers are respectively a first heat exchanger and a second heat exchanger; the first heat exchanger is communicated with the second reversing valve through the first pipeline, the gas-liquid separator is communicated with the second reversing valve through the first input pipe, the gas-liquid separator is communicated with the air outlet pipe, the gas-liquid separator is communicated with the second reversing valve through the liquid outlet pipe, the second heat exchanger is communicated with the second reversing valve through the second pipeline, the second heat exchanger is communicated with the first reversing valve through the third pipeline, the compressor assembly is communicated with the first reversing valve through the output pipe, the first reversing valve is communicated with the fourth pipeline, the compressor assembly is communicated with the second input pipe, the second input pipe, the fourth pipeline and the air outlet pipe are connected and connected, and the first heat exchanger is communicated with the first reversing valve through the fifth pipeline.

6. The air conditioning system according to claim 5, characterized in that: During refrigeration, the second reversing valve connects the first pipeline with the first input pipeline, and connects the liquid outlet pipeline with the second pipeline. The first reversing valve connects the third pipeline with the fourth pipeline, and connects the output pipeline with the fifth pipeline.

7. The air conditioning system according to claim 5, characterized in that: During heating, the second reversing valve connects the second pipeline with the first input pipeline, and connects the liquid outlet pipeline with the first pipeline, and the first reversing valve connects the output pipeline with the third pipeline, and connects the fifth pipeline with the fourth pipeline.

8. The air conditioning system according to claim 5, characterized in that: The air conditioning system comprises a throttling device, which is arranged on the first inlet pipe.

9. The air conditioning system according to claim 1, characterized in that: The compressor assembly includes a compressor body and a liquid reservoir connected through a pipeline, an inlet end of the liquid reservoir is connected to the pipeline, and an outlet end of the compressor body is connected to the pipeline.

10. The air conditioning system according to claim 1, characterized in that: When one of the heat exchangers functions as a condenser, the other heat exchanger functions as an evaporator; conversely, when one of the heat exchangers functions as an evaporator, the other heat exchanger functions as a condenser.

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