Indoor air temperature adjustment system

Abstract

An indoor air temperature adjustment system. The indoor air temperature adjustment system comprises a compressor (1), an outdoor unit (2), a gas-liquid separator (3) and an indoor unit assembly (4); the compressor (1) is provided with a first air inlet (11), a second air inlet (12) and an air outlet (13); and an inlet of the outdoor unit (2) is communicated with an air outlet (13) of the compressor (1); the gas-liquid separator (3) is provided with a gas-liquid phase inlet (31), a liquid phase outlet (32) and a gas phase outlet (33), the gas-liquid phase inlet (31) is communicated with an outlet of the outdoor unit (2), the liquid phase outlet (32) is communicated with an inlet of the indoor unit assembly (4), and the gas phase outlet (33) is communicated with the second gas inlet (12); and an outlet of the indoor unit assembly (4) is communicated with the first air inlet (11). The cooling performance of the indoor air temperature adjustment system can be greatly improved.

Description

Indoor air temperature control system

[0001] This application claims priority to Chinese patent application No. 202311733051.0, filed on December 14, 2023, entitled “Indoor Air Temperature Control System,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of electrical appliance technology, and in particular to an indoor air temperature control system. Background Art

[0003] New refrigerants (such as R290, i.e. propane) require strict control of the charge amount.

[0004] Currently, the condensing rate of the outdoor unit in a system is typically adjusted to an appropriate level so that the refrigerant flowing out of the outdoor unit consists of both liquid and vapor phases. This vapor phase refrigerant is then used to fill the system's piping, reducing the refrigerant charge. Furthermore, to ensure that the refrigerant's latent heat is fully utilized (i.e., the refrigerant flowing into the indoor unit is entirely liquid), a gas-liquid separator is installed at the outdoor unit's outlet, with the liquid phase outlet of the gas-liquid separator connected to the indoor unit's inlet.

[0005] In the above structure, the gas phase outlet of the gas-liquid separator is usually connected to the inlet of the outdoor unit, that is, the gas phase outlet of the gas-liquid separator is usually connected to the air outlet of the compressor. The pressure of the refrigerant will drop after passing through the gas-liquid separator, which causes a pressure difference between the air outlet and the gas phase outlet of the compressor. A part of the high-pressure gas phase refrigerant flowing out of the air outlet of the compressor will flow directly to the gas phase outlet of the gas-liquid separator, resulting in a significant reduction in the refrigeration performance of the system.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide an indoor air temperature control system that can solve the technical problems existing in the related art. The technical solution is as follows:

[0008] An embodiment of the present application provides an indoor air temperature regulation system, the indoor air temperature regulation system comprising a compressor, an outdoor unit, a gas-liquid separator, and an indoor unit assembly;

[0009] The compressor has a first air inlet, a second air inlet and an air outlet;

[0010] The inlet of the outdoor unit is connected to the air outlet of the compressor;

[0011] The gas-liquid separator has a gas-liquid phase inlet, a liquid phase outlet and a gas phase outlet, the gas-liquid phase inlet is connected to the outlet of the outdoor unit, the liquid phase outlet is connected to the inlet of the indoor unit assembly, and the gas phase outlet is connected to the second air inlet;

[0012] The outlet of the indoor unit assembly is communicated with the first air inlet.

[0013] In a possible implementation, the compressor includes a first cylinder and a second cylinder;

[0014] The first cylinder has the first air inlet and the first air outlet;

[0015] The second cylinder has the second air inlet and the second air outlet;

[0016] The inlet of the outdoor unit is communicated with the first air outlet and the second air outlet.

[0017] In a possible implementation, the indoor unit assembly includes a throttle valve and an indoor unit body;

[0018] The inlet of the throttle valve is connected to the liquid phase outlet, and the outlet of the throttle valve is connected to the inlet of the indoor unit body;

[0019] The outlet of the indoor unit body is communicated with the first air inlet.

[0020] In a possible implementation, the indoor air temperature control system further includes a first four-way valve and a second four-way valve;

[0021] The first four-way valve has a first port, a second port, a third port, and a fourth port, the first port being connected to the air outlet, the second port being connected to the inlet of the outdoor unit, the third port being connected to the first air inlet, and the fourth port being connected to the outlet of the indoor unit body;

[0022] The second four-way valve has a fifth interface, a sixth interface, a seventh interface and an eighth interface, the fifth interface is connected to the outlet of the outdoor unit, the sixth interface is connected to the gas-liquid phase inlet, the seventh interface is connected to the inlet of the indoor unit body, and the eighth interface is connected to the outlet of the throttle valve.

[0023] In a possible implementation, the indoor air temperature adjustment system further includes a controller;

[0024] The controller is electrically connected to the first four-way valve and the second four-way valve, and is used to:

[0025] In the cooling condition, the first interface is controlled to be connected to the second interface, the third interface is controlled to be connected to the fourth interface, the fifth interface is controlled to be connected to the sixth interface, and the seventh interface is controlled to be connected to the eighth interface;

[0026] In the heating condition, the first interface is controlled to be connected to the fourth interface, the second interface is controlled to be connected to the third interface, the fifth interface is controlled to be connected to the eighth interface, and the second interface is controlled to be connected to the third interface.

[0027] In a possible implementation, the throttle valve is an electrically controlled valve.

[0028] In a possible implementation, the indoor air temperature control system further includes a first connecting pipe, wherein the first connecting pipe includes a first connecting pipe body and an orifice plate;

[0029] The two ends of the first connecting pipe body are respectively connected to the liquid phase outlet and the inlet of the indoor unit assembly;

[0030] The orifice plate is located in the first connecting pipe body and is connected to the first connecting pipe body.

[0031] In a possible implementation, the indoor air temperature control system further includes a second connecting pipe, wherein the second connecting pipe includes a second connecting pipe body and a plurality of baffles;

[0032] The two ends of the second connecting pipe body are respectively connected to the gas phase outlet and the second gas inlet;

[0033] The plurality of baffles are all located in the second connecting pipe body and connected to the second connecting pipe body.

[0034] In a possible implementation, the gas-liquid separator has a separation chamber;

[0035] The side wall of the separation chamber is connected to the gas-liquid phase inlet, the bottom of the separation chamber is connected to the liquid phase outlet, and the top of the separation chamber is connected to the gas phase outlet.

[0036] In a possible implementation, the separation chamber has a cylindrical structure.

[0037] In a possible implementation, the refrigerant used in the indoor air temperature control system is propane, and the refrigerant charge amount of the indoor air temperature control system is less than 700 g.

[0038] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0039] An embodiment of the present application provides an indoor air temperature control system, in which a compressor has a first air inlet, a second air inlet, and an air outlet, the inlet of an outdoor unit is connected to the air outlet of the compressor, and a gas-liquid separator has a gas-liquid phase inlet, a liquid phase outlet, and a gas phase outlet, the gas-liquid phase inlet is connected to the outlet of the outdoor unit, the liquid phase outlet is connected to the inlet of the indoor unit assembly, the gas phase outlet is connected to the second air inlet, and the outlet of the indoor unit assembly is connected to the first air inlet. In this way, the gas-phase refrigerant flowing out of the outlet of the indoor unit assembly and the gas-phase refrigerant flowing out of the gas-phase outlet of the gas-liquid separator will first enter the compressor, and after being compressed by the compressor, the pressures of the two gas-phase refrigerants are balanced and then enter the outdoor unit through the inlet of the outdoor unit for condensation. Then, all the gas-phase refrigerant can flow to the outdoor unit, and the latent heat of all the gas-phase refrigerants can be fully utilized, which can greatly improve the refrigeration performance of the indoor air temperature control system. At the same time, for this indoor air temperature control system, it is possible to achieve that the inlet of the outdoor unit is entirely gas-phase refrigerant, and the outlet of the outdoor unit is partially gas-phase refrigerant and partially liquid-phase refrigerant. Compared with the traditional indoor air temperature control system, this indoor air temperature control system greatly reduces the refrigerant density and refrigerant mass corresponding to the outlet of the outdoor unit. For the indoor air temperature control system, the refrigerant charge is mainly concentrated in the outdoor unit. Therefore, the indoor air temperature control system of the present application can significantly reduce the refrigerant charge. In addition, in this indoor air temperature control system, since part of the gas-phase refrigerant at the outlet of the outdoor unit is still high-pressure gas, this part of the gas-phase refrigerant returns to the suction port of the compressor through the gas-phase outlet of the gas-liquid separator. The compressor only needs to expend very little compression work to make this part of the gas-phase refrigerant return to the outdoor unit for heat exchange, thereby achieving energy-saving and efficiency-improving effects.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] FIG1 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0043] FIG2 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0044] FIG3 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0045] FIG4 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0046] FIG5 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0047] FIG6 is a schematic structural diagram of a gas-liquid separator shown in an embodiment of the present application;

[0048] FIG7 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application;

[0049] FIG8 is a schematic structural diagram of a gas-liquid separator shown in an embodiment of the present application;

[0050] FIG9 is a schematic structural diagram of an indoor air temperature control system according to an embodiment of the present application.

[0051] Legend

[0052] 1. Compressor; 1a. First compressor unit; 1b. Second compressor unit;

[0053] 11. First air inlet; 12. Second air inlet; 13. Air outlet;

[0054] 131. First air outlet; 132. Second air outlet;

[0055] 110, first cylinder; 120, second cylinder;

[0056] 2. Outdoor unit;

[0057] 3. Gas-liquid separator;

[0058] 31. Gas-liquid phase inlet; 32. Liquid phase outlet; 33. Gas phase outlet; 34. Separation chamber;

[0059] 4. Indoor unit components;

[0060] 41. Throttle valve; 42. Indoor unit body;

[0061] 5. First four-way valve;

[0062] 51, first interface; 52, second interface; 53, third interface; 54, fourth interface;

[0063] 6. Second four-way valve;

[0064] 61, fifth interface; 62, sixth interface; 63, seventh interface; 64, eighth interface;

[0065] 7. First connecting pipe;

[0066] 71. First connecting pipe body; 72. Orifice plate;

[0067] 8. Second connecting pipe;

[0068] 81. Second connecting pipe body; 82. Baffle;

[0069] 001. Controller. DETAILED DESCRIPTION

[0070] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0071] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which this application belongs. The terms "first", "second", "third" and similar words used in the patent disclosure specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0072] Nowadays, new refrigerants are gradually replacing traditional refrigerants because of their higher heat transfer efficiency and better environmental protection. Most new refrigerants are flammable (such as R290, etc.). Therefore, when using new refrigerants, the filling amount of the machine needs to be strictly controlled. For example, in the relevant standards, if R290 is applied to the home indoor air temperature control system, the filling amount needs to be controlled below 334 grams. At present, it is usually chosen to adjust the condensing rate of the outdoor unit in the indoor air temperature control system to a specific value. Under this value, two-phase refrigerant flows out of the outdoor unit outlet, that is, liquid refrigerant and gaseous refrigerant flow out of the outdoor unit outlet. The gaseous refrigerant is used to fill the pipes in the system to achieve the goal of reducing the filling amount of the indoor air temperature control system while ensuring the continuity of the refrigerant flow in the system. On this basis, in order to ensure that the latent heat of the refrigerant in the indoor unit is fully utilized, it is necessary to ensure that the refrigerant entering the indoor unit is in liquid phase (because the gas phase refrigerant cannot undergo phase change in the indoor unit, that is, it cannot absorb heat). To this end, it is necessary to set a gas-liquid separator at the outlet of the outdoor unit and connect the liquid phase outlet of the gas-liquid separator to the indoor unit.

[0073] In the related art, as shown in FIG7 , the liquid refrigerant and gas refrigerant flowing out of the outdoor unit outlet enter the gas-liquid separator and are separated into independent gas and liquid phases. The gas phase outlet of the gas-liquid separator is connected to the outdoor unit, and the liquid phase outlet of the gas-liquid separator is connected to the indoor unit. The liquid refrigerant flows directly from the liquid phase outlet to the indoor unit, while the gas phase refrigerant flows directly from the gas phase outlet to the outdoor unit. However, due to the diversion effect of the gas-liquid separator, the corresponding pressure of the refrigerant will decrease after passing through the gas-liquid separator. That is, there is a pressure difference between the pressure at the gas phase outlet of the gas-liquid separator and the pressure at the air outlet of the compressor. The pressure at the gas phase outlet of the gas-liquid separator is lower than the pressure at the air outlet of the compressor. This causes a portion of the high-pressure gas phase refrigerant flowing out of the air outlet of the compressor to flow directly to the gas phase outlet of the gas-liquid separator. The high-temperature and high-pressure gas phase refrigerant cannot all flow to the outdoor unit, and the latent heat of some gas phase refrigerant cannot be fully utilized, which greatly reduces the cooling performance of the system.

[0074] An embodiment of the present application provides an indoor air temperature regulation system, which includes a compressor 1 , an outdoor unit 2 , a gas-liquid separator 3 and an indoor unit assembly 4 .

[0075] Among them, the compressor 1 has a first air inlet 11, a second air inlet 12 and an air outlet 13, the inlet of the outdoor unit 2 is connected to the air outlet 13 of the compressor 1, the gas-liquid separator 3 has a gas-liquid phase inlet 31, a liquid phase outlet 32 ​​and a gas phase outlet 33, the gas-liquid phase inlet 31 is connected to the outlet of the outdoor unit 2, the liquid phase outlet 32 ​​is connected to the inlet of the indoor unit component 4, the gas phase outlet 33 is connected to the second air inlet 12, and the outlet of the indoor unit component 4 is connected to the first air inlet 11.

[0076] In this way, the gas-phase refrigerant flowing out of the outlet of the indoor unit assembly 4 and the gas-phase refrigerant flowing out of the gas-phase outlet 33 of the gas-liquid separator 3 will first enter the compressor 1. After being compressed by the compressor 1, the pressures of the two gas-phase refrigerants are balanced and then enter the outdoor unit 2 through the inlet of the outdoor unit 2 for condensation. Then, all the gas-phase refrigerant can flow into the outdoor unit, and the latent heat of all the gas-phase refrigerant can be fully utilized, which can greatly improve the refrigeration performance of the indoor air temperature control system. At the same time, for this indoor air temperature control system, it can be achieved that the inlet of the outdoor unit 2 is all gas-phase refrigerant, and the outlet of the outdoor unit 2 is partially gas-phase refrigerant and the other partially liquid-phase refrigerant. Compared with the traditional indoor air temperature control system, this indoor air temperature control system greatly reduces the refrigerant density and refrigerant mass corresponding to the outlet of the outdoor unit 2. For the indoor air temperature control system, the refrigerant charge is mainly concentrated in the outdoor unit. Therefore, the indoor air temperature control system of the present application can significantly reduce the refrigerant charge. In addition, in the indoor air temperature control system, since part of the gas-phase refrigerant at the outlet of the outdoor unit 2 is still a high-pressure gas, this part of the gas-phase refrigerant returns to the air intake 12 of the compressor 1 through the gas-phase outlet 33 of the gas-liquid separator 3. The compressor 1 only needs to spend very little compression work to make this part of the gas-phase refrigerant return to the outdoor unit 2 for heat exchange, so it has the effect of energy saving and efficiency improvement.

[0077] Below, taking the cooling condition as an example, the various components of the indoor air temperature control system are introduced separately:

[0078] 1. Compressor 1

[0079] The compressor 1 is a component in the indoor air temperature control system that compresses the gas-phase refrigerant to increase the temperature and pressure of the gas-phase refrigerant.

[0080] As shown in FIG. 1 , the compressor 1 has a first air inlet 11 , a second air inlet 12 , and an air outlet 13 .

[0081] The first air inlet 11 of the compressor 1 is connected to the outlet of the indoor unit assembly 4 , the second air inlet 12 is connected to the gas phase outlet 33 of the gas-liquid separator 3 , and the air outlet 13 is connected to the inlet of the outdoor unit 2 .

[0082] In practice, the first air inlet 11 of the compressor 1 can be connected to the outlet of the indoor unit assembly 4 via a pipe, the second air inlet 12 can be connected to the gas phase outlet 33 of the gas-liquid separator 3 via a pipe, and the air outlet 13 can be connected to the inlet of the outdoor unit 2 via a pipe. The inner diameters of the above-mentioned pipes can be the same or different, and the embodiments of the present application do not limit the inner diameters of the pipes.

[0083] Under refrigeration conditions, the refrigerant flow direction in the system is: the refrigerant flows from the compressor 1 to the outdoor unit 2, flows through the outdoor unit 2 to the gas-liquid separator 3, and is divided into two paths in the gas-liquid separator 3, one of which passes through the indoor unit component 4 and enters the first air inlet 11 of the compressor 1, and the other flows directly to the second air inlet 12 of the compressor 1.

[0084] Compressor 1 comprises a cylinder and a piston. The cylinder defines a piston chamber (not shown). The piston is slidably connected to the piston chamber. As the piston moves, it compresses the low-temperature, low-pressure gaseous refrigerant entering the piston chamber. The compressed gaseous refrigerant heats up and flows from the compressor's outlet into the outdoor unit. During the process of compressing the gaseous refrigerant, energy is converted into electrical energy, which is then converted into mechanical energy of the piston and subsequently into the internal energy of the refrigerant.

[0085] In one example, the compressor 1 is a single-cylinder compressor.

[0086] As shown in FIG. 1 , the compressor 1 is a single-cylinder compressor having a first air intake port 11 and a second air intake port 12 .

[0087] During implementation, when the piston does not compress the gas-phase refrigerant in the piston chamber, the air pressure inside the compressor 1 is lower than the pressure at the gas-phase outlet 33, and is also lower than the pressure at the outlet of the indoor unit assembly 4. The gas-phase refrigerant flows to the compressor 1 from the gas-phase outlet 33 and the outlet of the indoor unit assembly 4 respectively, and one-way baffles are provided at the position of the first air inlet 11 and the position of the second air inlet 12. The one-way baffle can prevent the gas-phase refrigerant from flowing back to the gas-phase outlet 33 and the outlet of the indoor unit assembly 4 when the pressure inside the compressor 1 increases, thereby maintaining the stable flow direction of the refrigerant in the system.

[0088] In one example, the compressor 1 is a two-cylinder compressor.

[0089] As shown in Figure 2, the compressor 1 includes a first cylinder 110 and a second cylinder 120. The first cylinder 110 has a first air inlet 11 and a first air outlet 131, and the second cylinder 120 has a second air inlet 12 and a second air outlet 132. The first air outlet 131 and the second air outlet 132 are respectively connected to the inlet of the outdoor unit 2.

[0090] The compression stroke corresponding to the first air outlet 131 is greater than the compression stroke corresponding to the second air outlet 132 .

[0091] During implementation, the pressure of the liquid refrigerant decreases after flowing through the indoor unit assembly 4, that is, the pressure at the outlet of the indoor unit assembly 4 is less than the pressure at the gas outlet 33. The compression stroke corresponding to the first air outlet 131 is greater than the compression stroke corresponding to the second air outlet 132, so that the pressure increment of the gas-phase refrigerant compressed by the first cylinder 110 is greater than the pressure increment of the gas-phase refrigerant compressed by the second cylinder 120, so that the pressure at the first air outlet 131 and the second air outlet 132 are equal, ensuring the stable flow of refrigerant in the system.

[0092] Optionally, the compressor 1 may be a scroll compressor.

[0093] The scroll compressor has the characteristics of smaller axial size and lower noise. Compared with the piston compressor, the scroll compressor can reduce the size of the outdoor unit after the integrated compressor 1, and at the same time reduce the working noise of the outdoor unit when the indoor air temperature control system is working.

[0094] In a possible implementation, the compressor 1 includes a first compressor unit 1 a and a second compressor unit 1 b that are independent of each other.

[0095] As shown in FIG9 , the first compressor unit 1a has a first air inlet 11 and a first air outlet 131. The first air inlet 11 is connected to the outlet of the indoor unit assembly 4, and the first air outlet 131 is connected to the inlet of the outdoor unit 2. The second compressor unit 1b has a second air inlet 12 and a second air outlet 132. The second air inlet 12 is connected to the gas phase outlet 33 of the gas-liquid separator 3, and the second air outlet 132 is connected to the inlet of the outdoor unit 2.

[0096] In this way, since the first compressor unit 1a and the second compressor unit 1b are independent of each other, their arrangement positions in the indoor air temperature control system are more flexible, thereby improving the flexibility of arrangement positions of various components in the indoor air temperature control system.

[0097] In practice, the pressure at the first gas outlet 131 is equal to the pressure at the second gas outlet 132 .

[0098] In this way, it can be ensured that the gas-phase refrigerant flowing out of the first gas outlet 131 and the gas-phase refrigerant flowing out of the second gas outlet 132 will not flow in parallel, thereby ensuring that the refrigerant flow in the system is stable.

[0099] 2. Outdoor unit 2

[0100] In the cooling condition, the outdoor unit 2 is a component in the indoor air temperature control system that condenses the gas-phase refrigerant, that is, the outdoor unit 2 is a condenser.

[0101] As shown in FIG1 , the outdoor unit 2 has an inlet and an outlet.

[0102] The inlet of the outdoor unit 2 is connected to the air outlet of the compressor 1 , and the outlet of the outdoor unit 2 is connected to the gas-liquid phase inlet 31 of the gas-liquid separator 3 .

[0103] In practice, the condensation rate of the outdoor unit 2 can be controlled according to actual needs. When the condensation rate is 100%, the gas-phase refrigerant completely changes phase to liquid-phase refrigerant after condensation in the outdoor unit 2. In scenarios where new refrigerants are used, since it is necessary to reduce the refrigerant charge, the condensation rate can be adjusted to an appropriate level by adjusting the speed of the fan in the outdoor unit to adjust the air volume for heat exchange with the condenser, or by controlling the heat exchange area of ​​the heat exchanger in the outdoor unit, or by controlling the corresponding opening of the electronically controlled valve in the outdoor unit. This allows the gas-phase refrigerant to partially change phase to liquid-phase refrigerant after condensation in the outdoor unit 2, while the remaining portion remains gas-phase refrigerant. This portion of gas-phase refrigerant can fill the pipes in the outdoor unit 2, thereby reducing the charge of the indoor air temperature control system while ensuring the continuity of refrigerant flow within the system.

[0104] The inlet of the outdoor unit 2 can be connected to the air outlet of the compressor 1 via a pipe, and the outlet of the outdoor unit 2 can be connected to the gas-liquid phase inlet 31 of the gas-liquid separator 3 via a pipe. The inner diameters of the above-mentioned pipes can be the same or different, and the embodiments of the present application do not limit the inner diameters of the pipes.

[0105] The gas-phase refrigerant is compressed by the compressor 1 and flows to the outdoor unit 2. In the outdoor unit 2, the high-temperature and high-pressure gas-phase refrigerant exchanges heat with the outside world. Then the gas-phase refrigerant undergoes a phase change, partially changing into a liquid-phase refrigerant. During this process, the refrigerant releases heat.

[0106] In practice, taking cooling operation as an example, the outdoor unit 2 can be integrated into the outdoor unit housing. The gas-phase refrigerant in the outdoor unit 2 liquefies into a liquid-phase refrigerant, releasing heat externally during this process. Furthermore, a fan can be integrated into the outdoor unit housing, with the fan's airflow facing the outdoor unit 2. This fan can be used to quickly dissipate the heat released during the liquefaction of the gas-phase refrigerant into a liquid-phase refrigerant.

[0107] In one example, as shown in FIG2 , the compressor 1 in the system is a two-cylinder compressor. In this case, the outdoor unit 2 may be provided with two or only one inlet. When the outdoor unit 2 is provided with two inlets, one of the inlets may be connected to the first air outlet 131 via a pipe, and the other inlet may be connected to the second air outlet 132 via a pipe. When the outdoor unit 2 is provided with only one inlet, the inlet may be connected to one end of the pipe, and the first air outlet 131 and the second air outlet 132 may both be connected to the other end of the pipe.

[0108] In this way, the connection convenience between the compressor 1 and the outdoor unit 2 can be improved.

[0109] In some possible embodiments, the refrigerant used in the indoor air temperature control system is propane (ie, R290), and the refrigerant charge amount of the indoor air temperature control system is less than 700 g.

[0110] This improves the overall heat transfer efficiency and environmental performance of indoor air temperature control systems due to R290's higher heat transfer efficiency and improved environmental performance. Furthermore, due to its flammability, limiting the R290 charge in indoor air temperature control systems to less than 700g ensures good safety performance.

[0111] 3. Gas-liquid separator 3

[0112] The gas-liquid separator 3 is a component for separating gas-phase refrigerant and liquid-phase refrigerant in the indoor air temperature control system.

[0113] As shown in FIG. 1 , the gas-liquid separator 3 has a gas-liquid phase inlet 31 , a liquid phase outlet 32 ​​, and a gas phase outlet 33 .

[0114] The gas-liquid phase inlet 31 of the gas-liquid separator 3 is connected to the outlet of the outdoor unit 2 , the liquid phase outlet 32 ​​is connected to the inlet of the indoor unit assembly 4 , and the gas phase outlet 33 is connected to the second air inlet 12 of the compressor 1 .

[0115] In practice, the gas-liquid phase inlet 31 can be connected to the outlet of the outdoor unit 2 via a pipe, the liquid phase outlet 32 ​​can be connected to the inlet of the indoor unit assembly 4 via a pipe, and the gas phase outlet 33 can be connected to the second air inlet 12 of the compressor 1 via a pipe. The inner diameters of the aforementioned pipes can be the same or different, and the embodiments of the present application do not limit the inner diameters of the pipes.

[0116] As shown in FIG6 , the gas-liquid separator 3 has a separation chamber 34 . The sidewall of the separation chamber 34 is connected to the gas-liquid phase inlet 31 , the bottom of the separation chamber 34 is connected to the liquid phase outlet 32 ​​, and the top of the separation chamber 34 is connected to the gas phase outlet 33 .

[0117] During implementation, the gas-liquid two-phase refrigerant flows out from the outlet of the outdoor unit 2, and enters the separation chamber 34 through the pipeline and the gas-liquid phase inlet 31 of the gas-liquid separator 3 in turn. The gas-liquid two-phase refrigerant flows along the side wall of the separation chamber 34 in the separation chamber 34, and the gas-phase refrigerant and the liquid-phase refrigerant are separated. Then the gas-phase refrigerant flows to the top of the chamber and leaves the gas-liquid separator 3 through the gas-phase outlet 33. Correspondingly, the liquid-phase refrigerant flows to the bottom of the chamber and leaves the gas-liquid separator 3 through the liquid-phase outlet 32.

[0118] In one example, the separation chamber 34 has a cylindrical structure.

[0119] In this way, when the gas-liquid two-phase refrigerant flows on the side wall of the separation chamber 34, the flow field of the refrigerant can be stabilized, thereby improving the separation efficiency of the gas-phase refrigerant and the liquid-phase refrigerant.

[0120] Optionally, as shown in FIG6 , the bottom of the separation chamber 34 and the liquid phase outlet 32 ​​are in an inclined transition.

[0121] In this way, it is possible to avoid excessive liquid-phase refrigerant from being retained in the gas-liquid separator 3, thereby further reducing the refrigerant charge amount.

[0122] Optionally, as shown in FIG8 , the axis of the gas-liquid phase inlet 31 is perpendicular to the axis of the cylindrical structure and extends along a tangent line of the side wall of the cylindrical structure.

[0123] In this way, splashing of the gas-liquid two-phase refrigerant when it contacts the side wall of the separation chamber 34 can be avoided, thereby improving the separation efficiency of the gas-phase refrigerant and the liquid-phase refrigerant.

[0124] 4. Indoor unit components 4

[0125] In the cooling mode, the indoor unit assembly 4 is a component in the indoor air temperature control system that performs throttling and evaporating on the liquid refrigerant, that is, the indoor unit assembly 4 is an evaporator with an integrated throttling function.

[0126] As shown in FIG1 , the indoor unit assembly 4 has an inlet and an outlet.

[0127] The inlet of the indoor unit assembly 4 is connected to the liquid phase outlet 32 ​​of the gas-liquid separator 3 , and the outlet of the indoor unit assembly 4 is connected to the first air inlet 11 of the compressor 1 .

[0128] The inlet of the indoor unit assembly 4 can be connected to the liquid phase outlet 32 ​​of the gas-liquid separator 3 via a pipe, and the outlet of the indoor unit assembly 4 can be connected to the first air inlet 11 of the compressor 1 via a pipe. The inner diameters of the above-mentioned pipes can be the same or different, and the embodiments of the present application do not limit the inner diameters of the pipes.

[0129] After the gas-liquid two-phase refrigerant passes through the gas-liquid separator 3, the gas-phase refrigerant and the liquid-phase refrigerant are separated from each other, and the low-temperature liquid-phase refrigerant flows to the indoor unit component 4 through the liquid-phase outlet 32. In the indoor unit component 4, the low-temperature and low-pressure liquid-phase refrigerant exchanges heat with the outside world, and then the liquid-phase refrigerant undergoes a phase change, and all the liquid-phase refrigerant changes into a gas-phase refrigerant. During this process, the refrigerant absorbs heat.

[0130] In practice, taking cooling operation as an example, the indoor unit assembly 4 is integrated into the indoor unit. The indoor unit assembly 4 throttles the liquid refrigerant flowing from the liquid outlet 32. This throttling reduces the temperature and pressure of the liquid refrigerant. Furthermore, within the indoor unit assembly 4, the liquid refrigerant evaporates into a gaseous refrigerant. This process absorbs heat from the outside world, lowering the temperature of the ambient air. Therefore, a fan can be integrated into the indoor unit, with the fan's airflow direction set to face the indoor unit assembly 4. The fan blows the cooled gas out of the indoor unit, thereby cooling the room.

[0131] In one example, the indoor unit assembly 4 includes a throttle valve 41 and an indoor unit body 42 .

[0132] As shown in FIG3 , the inlet of the throttle valve 41 is connected to the liquid phase outlet 32 ​​through a pipe, and the outlet of the throttle valve 41 is connected to the inlet of the indoor unit body 42 through a pipe.

[0133] During implementation, the liquid refrigerant flows from the liquid outlet 32 ​​to the throttle valve 41. After the throttling action of the throttle valve 41, the temperature and pressure of the liquid refrigerant are reduced, and the low-temperature and low-pressure liquid refrigerant flows to the indoor unit body 42 and evaporates in the indoor unit body 42 to complete the heat exchange with the outdoor unit.

[0134] Optionally, the throttle valve 41 is an electrically controlled valve.

[0135] In this way, the opening of the throttle valve 41 can be adjusted according to the actual operating conditions of each component, so that the evaporator always has a high superheat.

[0136] The throttle valve 41 can be a needle-type throttle valve, a groove-type throttle valve, or a window-type throttle valve. The embodiment of the present application does not limit the type of the throttle valve 41.

[0137] Below, some optional structural features of the air temperature control system are introduced:

[0138] Structural Features 1. The indoor air temperature control system further includes a first four-way valve 5 and a second four-way valve 6.

[0139] As shown in Figure 4, the first four-way valve 5 has a first port 51, a second port 52, a third port 53, and a fourth port 54. The first port 51 is connected to the air outlet 13, the second port 52 is connected to the inlet of the outdoor unit 2, the third port 53 is connected to the first air inlet 11, and the fourth port 54 is connected to the outlet of the indoor unit body 42. The second four-way valve 6 has a fifth port 61, a sixth port 62, a seventh port 63, and an eighth port 64. The fifth port 61 is connected to the outlet of the outdoor unit 2, the sixth port 62 is connected to the gas-liquid phase inlet 31, the seventh port 63 is connected to the inlet of the indoor unit body 42, and the eighth port 64 is connected to the outlet of the throttle valve 41.

[0140] The interfaces of the first four-way valve 5 and the second four-way valve 6 can be connected to the interfaces of various components in the system through pipelines. The embodiment of the present application does not limit the inner diameter and length of each pipeline.

[0141] As shown in FIG. 4 and FIG. 5 , the indoor air temperature adjustment system further includes a controller 001 .

[0142] 4 and 5 , the controller 001 is electrically connected to the first four-way valve 5 and the second four-way valve 6. The controller 001 is used to control the first interface 51 to be connected to the second interface 52, the third interface 53 to be connected to the fourth interface 54, the fifth interface 61 to be connected to the sixth interface 62, and the seventh interface 63 to be connected to the eighth interface 64 under the cooling condition; and to control the first interface 51 to be connected to the fourth interface 54, the second interface 52 to be connected to the third interface 53, the fifth interface 61 to be connected to the eighth interface 64, and the second interface 52 to the third interface 53 under the heating condition.

[0143] In implementation, referring to FIG4 , under the refrigeration condition, the controller 001 controls the first four-way valve 5 and the second four-way valve 6. The connection state refers to the above. The flow direction of the refrigerant in the system is as follows: the compressor 1 compresses the low-pressure gas-phase refrigerant, and the high-pressure and high-temperature gas-phase refrigerant flows to the outdoor unit 2 through the first interface 51 and the second interface 52 in turn. The outdoor unit 2 acts as a condenser to condense the gas-phase refrigerant to obtain a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows to the gas-liquid separator 3 through the outlet of the outdoor unit 2, the fifth interface 61 and the sixth interface 62 in turn. The gas-liquid two-phase refrigerant is separated after passing through the gas-liquid separator 3. The gas-phase refrigerant flows to the second air inlet 12 of the compressor 1 through the gas-phase outlet 33, and the liquid-phase refrigerant flows to the throttle valve 41 through the liquid-phase outlet 32. After passing through the throttle valve 41, the temperature and pressure of the liquid-phase refrigerant decrease. Then, the liquid-phase refrigerant flows to the indoor unit body 42 through the eighth interface 64 and the seventh interface 63 in sequence. The indoor unit body 42 acts as an evaporator to evaporate the liquid-phase refrigerant. The liquid-phase refrigerant is completely evaporated into gas-phase refrigerant in the indoor unit body 42. The gas-phase refrigerant flows to the first air inlet 11 of the compressor 1 through the outlet of the indoor unit body 42, the fourth interface 54 and the third interface 53 in sequence, completing the cycle.

[0144] In implementation, referring to Figure 5, under the heating condition, the controller 001 controls the first four-way valve 5 and the second four-way valve 6. The connection state refers to the above. The flow direction of the refrigerant in the system is as follows: the compressor 1 compresses the low-pressure gas-phase refrigerant, and the high-pressure and high-temperature gas-phase refrigerant flows to the indoor unit body 42 through the first interface 51 and the fourth interface 54 in turn. The indoor unit body 42 acts as a condenser to condense the gas-phase refrigerant to obtain a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows to the gas-liquid separator 3 through the outlet, the seventh interface 63 and the sixth interface 62 in turn. The gas-liquid two-phase refrigerant is separated after passing through the gas-liquid separator 3, wherein the gas-phase refrigerant flows to the second air inlet 12 of the compressor 1 through the gas-phase outlet 33, and the liquid-phase refrigerant flows to the throttle valve 41 through the liquid-phase outlet 32. After passing through the throttle valve 41, the temperature and pressure of the liquid-phase refrigerant are reduced. Then it flows to the outdoor unit 2 through the eighth interface 64 and the fifth interface 61 in turn. The outdoor unit 2 acts as an evaporator to evaporate the liquid refrigerant. The liquid refrigerant is completely evaporated into gaseous refrigerant in the indoor unit body 42. The gaseous refrigerant passes through the outlet of the indoor unit body 42, the second interface 52 and the third interface 53 in turn and flows to the first air inlet 11 of the compressor 1 to complete the cycle.

[0145] In this way, no matter in the cooling condition or the heating condition, the gas-phase refrigerant flowing out of the gas-phase outlet 33 of the gas-liquid separator 3 will flow directly into the second air inlet 12 of the compressor 1, and the gas-phase refrigerant flowing out of the gas-phase outlet 33 can all enter the condenser (the cooling condition is the outdoor unit 2, and the heating condition is the indoor unit body 42), and the latent heat of all the gas-phase refrigerant can be fully utilized, which can greatly improve the cooling performance and heating performance of the indoor air temperature control system.

[0146] Structural feature 2: The indoor air temperature regulation system further includes a first connecting pipe 7 .

[0147] As shown in FIG6 , the first connecting pipe 7 includes a first connecting pipe body 71 and an orifice plate 72 . The orifice plate 72 is located inside the first connecting pipe body 71 and is connected to the first connecting pipe body 71 .

[0148] 6 , the orifice plate 72 has a throttle hole. The shape and size of the throttle hole can be set according to actual needs, and this embodiment of the present application does not limit this.

[0149] In practice, both ends of the first connecting pipe body 71 are connected to the liquid phase outlet 32 ​​and the inlet of the indoor unit assembly 4 respectively.

[0150] In this way, by setting the first connecting pipe 7, the liquid refrigerant flowing out of the liquid outlet 32 ​​can be throttled. When a small amount of gas refrigerant is mixed in the liquid refrigerant, the gas refrigerant in the liquid refrigerant can be precipitated, thereby ensuring that the refrigerant flowing to the indoor unit assembly 4 is all liquid, thereby improving the cooling performance and heating performance of the indoor air temperature control system.

[0151] Structural feature three: The indoor air temperature regulation system further includes a second connecting pipe 8 .

[0152] As shown in FIG. 6 , the second connecting pipe 8 includes a second connecting pipe body 81 and a plurality of baffles 82 . The plurality of baffles 82 are all located in the second connecting pipe body 81 and connected to the second connecting pipe body 81 .

[0153] In practice, both ends of the second connecting pipe body 81 are connected to the gas phase outlet 33 and the second gas inlet 12 respectively.

[0154] In this way, when a small amount of liquid refrigerant is mixed in the gas refrigerant, the baffle 82 can block the liquid refrigerant, causing the liquid refrigerant to flow back into the separation chamber 34, ensuring that the refrigerant flowing to the second air inlet 12 of the compressor 1 is all in the gas phase, thereby improving the service life of the compressor 1.

[0155] Optionally, the second connecting pipe body 81 can be a circular tube body, the baffle 82 can have a semicircular structure, the radius of the baffle 82 is equal to the inner diameter of the second connecting pipe body 81, and multiple baffles 82 are alternately distributed on both sides of the axis of the second connecting pipe body 81.

[0156] In this way, the reflux efficiency of the liquid-phase refrigerant can be improved.

[0157] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0158] The embodiment of the present application provides an indoor air temperature control system, in which a compressor 1 has a first air inlet 11, a second air inlet 12, and an air outlet 13. The inlet of an outdoor unit 2 is connected to the air outlet 13 of the compressor 1. A gas-liquid separator 3 has a gas-liquid inlet 31, a liquid-phase outlet 32, and a gas-phase outlet 33. The gas-liquid inlet 31 is connected to the outlet of the outdoor unit 2, the liquid-phase outlet 32 ​​is connected to the inlet of the indoor unit assembly 4, the gas-phase outlet 33 is connected to the second air inlet 12, and the outlet of the indoor unit assembly 4 is connected to the first air inlet 11. In this way, the gas-phase refrigerant flowing out of the outlet of the indoor unit assembly 4 and the gas-phase refrigerant flowing out of the gas-phase outlet 33 of the gas-liquid separator 3 both first enter the compressor 1. After being compressed by the compressor 1, the pressures of the two gas-phase refrigerants are balanced and then both enter the outdoor unit 2 through the inlet of the outdoor unit 2 for condensation. As a result, all the gas-phase refrigerant can flow into the outdoor unit, and the latent heat of all the gas-phase refrigerant can be fully utilized, which can significantly improve the refrigeration performance of the indoor air temperature control system. At the same time, for this indoor air temperature control system, the inlet of the outdoor unit 2 can be entirely filled with gas-phase refrigerant, and the outlet of the outdoor unit 2 can be partially filled with gas-phase refrigerant and partially filled with liquid-phase refrigerant. Compared with the traditional indoor air temperature control system, this indoor air temperature control system greatly reduces the refrigerant density and refrigerant mass corresponding to the outlet of the outdoor unit 2. For indoor air temperature control systems, the refrigerant charge is mainly concentrated in the outdoor unit. Therefore, the indoor air temperature control system of the present application can significantly reduce the refrigerant charge. In addition, in this indoor air temperature control system, since part of the gas-phase refrigerant at the outlet of the outdoor unit 2 is still high-pressure gas, this part of the gas-phase refrigerant returns to the suction port 12 of the compressor 1 through the gas-phase outlet 33 of the gas-liquid separator 3. The compressor 1 only needs to expend very little compression work to allow this part of the gas-phase refrigerant to return to the outdoor unit 2 for heat exchange, thereby achieving energy saving and efficiency improvement.

[0159] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An indoor air temperature control system, characterized in that: The indoor air temperature adjustment system comprises a compressor (1), an outdoor unit (2), a gas-liquid separator (3) and an indoor unit component (4); The compressor (1) has a first air inlet (11), a second air inlet (12) and an air outlet (13); The inlet of the outdoor unit (2) is connected to the air outlet (13) of the compressor (1); The gas-liquid separator (3) has a gas-liquid phase inlet (31), a liquid phase outlet (32) and a gas phase outlet (33); the gas-liquid phase inlet (31) is connected to the outlet of the outdoor unit (2); the liquid phase outlet (32) is connected to the inlet of the indoor unit component (4); and the gas phase outlet (33) is connected to the second air inlet (12); The outlet of the indoor unit assembly (4) is in communication with the first air inlet (11).

2. The indoor air temperature control system according to claim 1, characterized in that: The compressor (1) comprises a first cylinder block (110) and a second cylinder block (120); The first cylinder (110) has the first air inlet (11) and a first air outlet (131); The second cylinder (120) has the second air inlet (12) and a second air outlet (132); The inlet of the outdoor unit (2) is in communication with the first air outlet (131) and the second air outlet (132).

3. The indoor air temperature control system according to claim 1, characterized in that: The indoor unit assembly (4) comprises a throttle valve (41) and an indoor unit body (42); The inlet of the throttle valve (41) is connected to the liquid phase outlet (32), and the outlet of the throttle valve (41) is connected to the inlet of the indoor unit body (42); The outlet of the indoor unit body (42) is in communication with the first air inlet (11).

4. The indoor air temperature control system according to claim 3, characterized in that: The indoor air temperature adjustment system further comprises a first four-way valve (5) and a second four-way valve (6); The first four-way valve (5) has a first interface (51), a second interface (52), a third interface (53) and a fourth interface (54); the first interface (51) is connected to the air outlet (13); the second interface (52) is connected to the inlet of the outdoor unit (2); the third interface (53) is connected to the first air inlet (11); and the fourth interface (54) is connected to the outlet of the indoor unit body (42). Connectivity; The second four-way valve (6) has a fifth interface (61), a sixth interface (62), a seventh interface (63) and an eighth interface (64); the fifth interface (61) is connected to the outlet of the outdoor unit (2); the sixth interface (62) is connected to the gas-liquid phase inlet (31); the seventh interface (63) is connected to the inlet of the indoor unit body (42); and the eighth interface (64) is connected to the outlet of the throttle valve (41).

5. The indoor air temperature control system according to claim 4, characterized in that: The indoor air temperature adjustment system further comprises a controller (001); The controller (001) is electrically connected to the first four-way valve (5) and the second four-way valve (6) and is used to: In a refrigeration condition, the first interface (51) is controlled to be connected to the second interface (52), the third interface (53) is controlled to be connected to the fourth interface (54), the fifth interface (61) is controlled to be connected to the sixth interface (62), and the seventh interface (63) is controlled to be connected to the eighth interface (64); Under the heating condition, the first interface (51) is controlled to be connected to the fourth interface (54), the second interface (52) is controlled to be connected to the third interface (53), the fifth interface (61) is controlled to be connected to the eighth interface (64), and the second interface (52) is controlled to be connected to the third interface (53).

6. The indoor air temperature control system according to claim 3, characterized in that: The throttle valve (41) is an electrically controlled valve.

7. The indoor air temperature control system according to claim 1, characterized in that: The indoor air temperature adjustment system further comprises a first connecting pipe (7), wherein the first connecting pipe (7) comprises a first connecting pipe body (71) and an orifice plate (72); The two ends of the first connecting pipe body (71) are respectively connected to the liquid phase outlet (32) and the inlet of the indoor unit assembly (4); The orifice plate (72) is located inside the first connecting pipe body (71) and is connected to the first connecting pipe body (71).

8. The indoor air temperature control system according to claim 1, characterized in that: The indoor air temperature adjustment system further comprises a second connecting pipe (8), wherein the second connecting pipe (8) comprises a second connecting pipe body (81) and a plurality of baffles (82); Two ends of the second connecting pipe body (81) are respectively connected to the gas phase outlet (33) and the second gas inlet (12); The plurality of baffles (82) are all located inside the second connecting pipe body (81) and are connected to the second connecting pipe body (81).

9. The indoor air temperature control system according to claim 1, characterized in that: The gas-liquid separator (3) has a separation chamber (34); The side wall of the separation chamber (34) is connected to the gas-liquid phase inlet (31), the bottom of the separation chamber (34) is connected to the liquid phase outlet (32), and the top of the separation chamber (34) is connected to the gas phase outlet (33).

10. The indoor air temperature control system according to claim 9, characterized in that: The separation chamber (34) has a cylindrical structure.

11. The indoor air temperature control system according to any one of claims 1 to 10, characterized in that: The refrigerant used in the indoor air temperature regulation system is propane, and the refrigerant filling amount of the indoor air temperature regulation system is less than 700g.

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