Air conditioning system

Abstract

The present invention provides an air conditioning system, comprising a reversing assembly, an indoor heat exchanger and an outdoor heat exchanger, the air conditioning system further comprising: a compressor comprising an exhaust port, an intermediate jet port and an air intake port; a first throttling element is arranged between the indoor heat exchanger and the outdoor heat exchanger; a flash evaporator is arranged between the first throttling element and the outdoor heat exchanger, the flash evaporator comprises a refrigerant inlet, an air outlet and a liquid outlet, the refrigerant inlet is connected to the first throttling element, and the liquid outlet is connected to the outdoor heat exchanger; an economizer is arranged in parallel with the flash evaporator, the economizer comprises a first pipe port, a second pipe port, a third pipe port and a fourth pipe port, the first pipe port is connected to the first throttling element, the second pipe port and the air outlet are both connected to the intermediate jet port, and the third pipe port and the fourth pipe port are connected to the outdoor heat exchanger. In the cooling mode and the heating mode, the flash evaporator or the economizer can be selected respectively, so as to optimize the cooling efficiency and the heating efficiency of the air conditioning system respectively, thereby improving the energy utilization efficiency throughout the year.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and more particularly to an air conditioning system. Background Art

[0002] The existing air conditioning systems with flash evaporators or economizers often only use one of the flash evaporators or economizers. For air conditioning systems that only use flash evaporators, in order to take into account both cooling and heating working modes, a flash evaporator with a bidirectional structure is often used. The inlet and liquid outlet of the bidirectional flash evaporator are usually symmetrically arranged at the bottom of the flash evaporator, while the gas outlet is arranged at the top of the flash evaporator. This type of flash evaporator generally has the disadvantage of a high liquid level when working, which is easy to cause liquid to be entrained at the gaseous outlet, and it is easy to cause liquid hammer in the compressor after being sprayed into the compressor; at the same time, the flashed gas and liquid are not fully separated, which is easy to cause gas to mix into the liquid outlet, reducing the heat exchange efficiency of the evaporator. In addition, since the refrigerant flow direction of the bidirectional flash evaporator is different during cooling and heating, and the mass flow rate of the refrigerant required for cooling and heating is not completely consistent, it is easy to have inconsistent working liquid levels of the flash evaporator during cooling and heating. The flash evaporator with the best efficiency for cooling may not be the best efficiency for heating. A similar situation is true for economizer-only air conditioning systems; a particular economizer design may perform best for heating, but not necessarily for cooling. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] One aspect of the present invention provides an air conditioning system.

[0005] In view of the above, the present invention provides an air-conditioning system, which includes a reversing component, an indoor heat exchanger and an outdoor heat exchanger, and the air-conditioning system also includes: a compressor, including an exhaust port, an intermediate jet port and an air intake port; a first throttling element, arranged between the indoor heat exchanger and the outdoor heat exchanger; a flash evaporator, arranged between the first throttling element and the outdoor heat exchanger, the flash evaporator including a refrigerant inlet, an air outlet and a liquid outlet, the refrigerant inlet is connected to the first throttling element, and the liquid outlet is connected to the outdoor heat exchanger; an economizer is arranged in parallel with the flash evaporator, the economizer includes a first pipe port, a second pipe port, a third pipe port and a fourth pipe port, the first pipe port is connected to the first throttling element, the second pipe port and the air outlet are both connected to the intermediate jet port, and the third pipe port and the fourth pipe port are connected to the outdoor heat exchanger.

[0006] The air conditioning system provided by the present invention comprises a reversing component, an indoor heat exchanger, an outdoor heat exchanger, a compressor, a first throttling element, a flash evaporator and an economizer. The compressor comprises three ports, namely, an exhaust port, an intermediate jet port and an air intake port. The flash evaporator comprises three ports, namely, a refrigerant inlet, an air outlet and a liquid outlet. The economizer comprises a first pipe port, a second pipe port, a third pipe port and a fourth pipe port. The refrigerant inlet and the first pipe port are both connected to the first throttling element, the air outlet and the second pipe port are both connected to the intermediate jet port, and the liquid outlet, the third pipe port and the fourth pipe port are all connected to the outdoor heat exchanger, so that in the cooling mode and the heating mode, the flash evaporator or the economizer can be selected respectively, that is, the economizer is connected to the circuit during cooling, and the flash evaporator is connected to the circuit during heating, which is beneficial to optimize the cooling efficiency and heating efficiency of the air conditioning system respectively, thereby improving the energy utilization efficiency throughout the year.

[0007] In addition, in common air-source cold water (heat pump) air conditioning systems, since the environment-side heat exchanger is generally a fin-tube heat exchanger and the water-side heat exchanger is generally a plate heat exchanger, and the internal volume of the plate heat exchanger is much smaller than that of the fin-tube heat exchanger, it is necessary to set a liquid reservoir in the refrigerant flow path on the plate heat exchanger side to balance the contradiction that the refrigerant circulation volume during heating is smaller than the refrigerant circulation volume during cooling. For the same air conditioning system, since the internal volume of the flash evaporator is larger and the internal volume of the economizer is smaller, the present invention uses a flash evaporator during heating and an economizer during cooling, which just helps to balance the difference in refrigerant circulation volume between the two operating modes of cooling and heating. At the same time, since the refrigerant liquid at the bottom of the flash evaporator can be partially stored in the economizer during heating, the storage space for additional refrigerant is further increased. The air conditioning system provided by the present invention does not need to set up a separate liquid reservoir, which helps to reduce the cost of the air conditioning system.

[0008] During refrigeration, the flash evaporator can also store medium-pressure gas refrigerant, which is equivalent to a buffer. It can keep the gas pressure injected into the middle jet port of the compressor stable, which is beneficial to the stable operation of the compressor.

[0009] Preferably, the flash evaporator provided by the present invention is a one-way flash evaporator. Compared with the two-way flash evaporator, the one-way flash evaporator has the advantages of good flashing effect and good gas-liquid separation effect. The dryness of the gas at the outlet of the one-way flash evaporator is large, which ensures the safe and stable operation of the compressor in the intermediate jet state. At the same time, the gas entrained in the liquid at the outlet of the one-way flash evaporator is small, which helps to improve the heat exchange efficiency of the evaporator and the energy efficiency of the air-conditioning system.

[0010] Preferably, the present invention can be used in two-stage compression, injection enthalpy increase, independent compression or any other air conditioning system that requires injection of refrigerant gas at an intermediate pressure into the compressor.

[0011] Specifically, one flow path (tube side) is formed between the first pipe opening and the fourth pipe opening, and another flow path (shell side) is formed between the second pipe opening and the third pipe opening.

[0012] The flash evaporator is a container that can hold refrigerant, which usually has three interfaces: the refrigerant inlet for the refrigerant gas-liquid mixture to enter, the refrigerant gas outlet and the refrigerant liquid outlet. Its working principle is: the gas-liquid mixture of the refrigerant from the upstream throttling element flows into the refrigerant inlet of the flash evaporator. Due to the sudden expansion of the volume, a large amount of refrigerant flashes out of the liquid refrigerant and becomes a refrigerant gas with a lower temperature, which flows out from the gas outlet, while the liquid refrigerant that has not flashed flows out of the flash evaporator from the liquid outlet. For a flash evaporator with good performance, the dryness of the refrigerant at its gas outlet should be as high as possible, and the dryness of the refrigerant at its liquid outlet should be as low as possible. That is, there should be no droplets entrained at the gas outlet of the flash evaporator, and there should be no gas mixed at the liquid outlet.

[0013] The economizer is a container that can hold refrigerant, which usually has four interfaces: refrigerant gas-liquid mixture inlet, refrigerant gas outlet, refrigerant liquid inlet and refrigerant liquid outlet. The economizer is also a partition-type heat exchanger, in which the surface connecting the refrigerant gas-liquid mixture inlet and the refrigerant gas outlet constitutes one side of the heat exchanger, and the surface connecting the refrigerant liquid inlet and the refrigerant liquid outlet constitutes the other side of the heat exchanger. The gas-liquid mixture of the refrigerant from the upstream throttling element flows into the economizer from the gas-liquid mixture inlet, evaporates on one side of the economizer, absorbs the heat of the refrigerant liquid flowing in from the liquid inlet on the other side, and supercools the liquid. After evaporation, the refrigerant gas-liquid mixture turns into gas, flows out of the economizer from the gas outlet, and the supercooled liquid flows out of the economizer from the liquid outlet.

[0014] In addition, the air conditioning system provided by the above technical solution of the present invention also has the following additional technical features:

[0015] In any of the above technical solutions, preferably, the reversing assembly includes a first end to a fourth end, the first end of the reversing assembly is connected to the exhaust port, and the second end of the reversing assembly is connected to the intake port; one end of the indoor heat exchanger is connected to the third end of the reversing assembly, and one end of the indoor heat exchanger is connected to the fourth end of the reversing assembly.

[0016] In this technical solution, the reversing component includes a first end to a fourth end, that is, a first end, a second end, a third end and a fourth end. The first end of the reversing component is connected to the exhaust port, the second end of the reversing component is connected to the intake port, the third end of the reversing component is connected to one end of the indoor heat exchanger, and the fourth end of the reversing component is connected to one end of the indoor heat exchanger to achieve conversion during cooling and heating; specifically, in the cooling state, the first end and the third end of the reversing component are connected, and the second end and the fourth end of the reversing component are connected, and in the heating state, the first end and the fourth end of the reversing component are connected, and the second end and the third end of the reversing component are connected.

[0017] In any of the above technical solutions, preferably, the air conditioning system further includes: a first valve body, located between the refrigerant inlet and the first throttling element.

[0018] In this technical solution, the air-conditioning system also includes a first valve body, which is arranged between the refrigerant inlet and the first throttling element to control the first valve body so that when the air-conditioning system is heating, the first valve body is opened to connect the flash evaporator to the circuit, and when the air-conditioning system is cooling, the first valve body is closed and the flash evaporator is not connected to the circuit.

[0019] In any of the above technical solutions, preferably, the air conditioning system further includes: a second valve body, located between the first pipe opening and the first throttling element, and the second valve body is connected in parallel with the first valve body.

[0020] In this technical solution, the air-conditioning system also includes a second valve body, which is located between the first pipe opening and the first throttling element, and is connected in parallel with the first valve body, and is located on the branch where the economizer is located. When the second valve body is controlled, the air-conditioning system opens the second valve body during cooling and connects the economizer to the circuit, and closes the second valve body during heating and does not connect the economizer to the circuit.

[0021] In any of the above technical solutions, preferably, the air-conditioning system also includes: a second throttling element, one end of the second throttling element is connected to the outdoor heat exchanger and the fourth pipe opening, and the other end of the second throttling element is connected to the liquid outlet and the third pipe opening.

[0022] In this technical solution, the air-conditioning system also includes a second throttling element, one end of which is connected to the outdoor heat exchanger and the fourth pipe opening, that is, the outdoor heat exchanger and the fourth pipe opening are connected to one end of the second throttling element through a pipeline; the other end of the second throttling element is connected to the liquid outlet and the third pipe opening, that is, the liquid outlet and the third pipe opening are connected to the other end of the second throttling element through a pipeline; when heating, the second throttling element throttles the refrigerant liquid sent by the flash evaporator for a second time and reduces the pressure, so that the refrigerant becomes a low-pressure gas-liquid mixture, so that it can subsequently enter the indoor side heat exchanger to evaporate and absorb heat; when cooling, a part of the high-pressure liquid refrigerant from the outdoor heat exchanger is throttled by the second throttling element to become a refrigerant of intermediate pressure, and finally sprayed into the compressor through the intermediate jet port to achieve the compressor enthalpy increase effect.

[0023] In any of the above technical solutions, preferably, the air conditioning system further includes: a third valve body, located between the liquid outlet and the second throttling element.

[0024] In this technical solution, the air-conditioning system also includes a third valve body, which is located between the liquid outlet and the second throttling element. When the third valve body is controlled, the third valve body is closed during cooling of the air-conditioning system, and the flash evaporator is not connected to the circuit. The third valve body is opened during heating, and the flash evaporator is connected to the circuit.

[0025] In any of the above technical solutions, preferably, the air conditioning system further comprises: a gas-liquid separator, the inlet of the gas-liquid separator is connected to the second end of the reversing assembly, and the outlet of the gas-liquid separator is connected to the air intake port.

[0026] In this technical solution, the air-conditioning system also includes a gas-liquid separator, the inlet of the gas-liquid separator is connected to the second end of the reversing assembly, and the outlet of the gas-liquid separator is connected to the air intake port, so that the refrigerant can be separated into gas and liquid when passing through the gas-liquid separator to protect the compressor.

[0027] In any of the above technical solutions, preferably, the first valve body is a solenoid valve.

[0028] In any of the above technical solutions, preferably, the second valve body is a one-way valve, and the conducting direction of the second valve body is from the economizer to the first throttling element.

[0029] In this technical solution, the second valve body is configured as a one-way valve, and the conduction direction of the second valve body is from the economizer to the first throttling element, so that the refrigerant can only be conducted from the economizer to the first throttling element, thereby avoiding the refrigerant from flowing into the economizer during heating.

[0030] It is conceivable that the second valve body can also be set as a solenoid valve, and the one-way conduction effect can be achieved by controlling it.

[0031] In any of the above technical solutions, preferably, the third valve body is a one-way valve, and the conducting direction of the third valve body is from the flash evaporator to the second throttling element.

[0032] In this technical solution, the third valve body is configured as a one-way valve, and the conduction direction of the third valve body is from the flash evaporator to the second throttling element, so that the refrigerant can only be conducted from the flash evaporator to the second throttling element, thereby avoiding the refrigerant from flowing into the flash evaporator during refrigeration.

[0033] In any of the above technical solutions, preferably, the first throttling element is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube.

[0034] In any of the above technical solutions, preferably, the second throttling element is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube.

[0035] In any of the above technical solutions, preferably, the flash evaporator and the economizer are both arranged vertically; and the installation heights of the flash evaporator and the economizer are the same.

[0036] In this technical solution, the flash evaporator and the economizer are both arranged vertically, and the installation heights of the flash evaporator and the economizer are set to be the same. In the heating mode, part of the liquid refrigerant flowing through the third valve body will enter the economizer through the third pipe opening of the economizer. Since the economizer and the flash evaporator are installed at the same height, and the air outlet of the flash evaporator is connected to the fourth pipe opening of the economizer, the space inside the shell of the economizer and the space on the shell side of the flash evaporator will be in a communicating vessel state with the same pressure, that is, the liquid level in the flash evaporator will be nearly equal to the shell side liquid level in the economizer. At this time, the economizer is equivalent to a liquid reservoir, which can store the refrigerant liquid that does not participate in the circulation in the system.

[0037] Additional aspects and advantages according to the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 A schematic structural diagram of an air conditioning system provided by an embodiment of the present invention is shown;

[0040] Figure 2 Another structural schematic diagram of an air conditioning system provided by an embodiment of the present invention is shown;

[0041] Figure 3 Another structural schematic diagram of an air conditioning system provided by an embodiment of the present invention is shown;

[0042] Figure 4 Another structural schematic diagram of an air conditioning system provided by an embodiment of the present invention is shown.

[0043] Reference numerals:

[0044] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0045] 10 reversing assembly, 10a first end, 10b second end, 10c third end, 10d fourth end, 12 compressor, 12d exhaust port, 12g intermediate jet port, 12s intake port, 14 indoor heat exchanger, 16 outdoor heat exchanger, 18 first throttling element, 20 flash evaporator, 20a refrigerant inlet, 20b gas outlet, 20c liquid outlet, 22 economizer, 22a first pipe port, 22b second pipe port, 22c third pipe port, 22d fourth pipe port, 24 first valve body, 26 second valve body, 28 second throttling element, 30 third valve body, 32 gas-liquid separator. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0048] Refer to the following Figures 1 to 4 An air conditioning system according to an embodiment of the present invention is described.

[0049] like Figures 1 to 4As shown, the present invention provides an air conditioning system, the air conditioning system includes a reversing assembly 10, an indoor heat exchanger 14 and an outdoor heat exchanger 16, and the air conditioning system also includes: a compressor 12, including an exhaust port 12d, an intermediate jet port 12g and an air intake port 12s; a first throttling element 18, arranged between the indoor heat exchanger 14 and the outdoor heat exchanger 16; a flash evaporator 20, arranged between the first throttling element 18 and the outdoor heat exchanger 16, and the flash evaporator 20 includes a refrigerant inlet 20a, an air outlet 20b and a liquid outlet 20c, the refrigerant inlet 20a is connected to the first throttling element 18, and the liquid outlet 20c is connected to the outdoor heat exchanger 16; the economizer 22 is arranged in parallel with the flash evaporator 20, and the economizer 22 includes a first pipe port 22a, a second pipe port 22b, a third pipe port 22c and a fourth pipe port 22d, the first pipe port 22a is connected to the first throttling element 18, the second pipe port 22b and the air outlet 20b are both connected to the intermediate jet port 12g, and the third pipe port 22c and the fourth pipe port 22d are connected to the outdoor heat exchanger 16.

[0050] The air conditioning system provided by the present invention comprises a reversing assembly 10, an indoor heat exchanger 14, an outdoor heat exchanger 16, a compressor 12, a first throttling element 18, a flash evaporator 20 and an economizer 22, wherein the compressor 12 comprises an exhaust port 12d, an intermediate jet port 12g and an air intake port 12s, the flash evaporator 20 comprises a refrigerant inlet 20a, an air outlet 20b and a liquid outlet 20c, the economizer 22 comprises a first pipe port 22a, a second pipe port 22b, a third pipe port 22c and a fourth pipe port 22d, and the refrigerant inlet 20a and the first pipe port 22d are connected to each other. The air outlet 20b and the second pipe port 22b are connected to the middle jet port 12g, and the liquid outlet 20c, the third pipe port 22c, and the fourth pipe port 22d are connected to the outdoor heat exchanger 16, so that in the cooling mode and the heating mode, the flash evaporator 20 or the economizer 22 can be selected respectively, that is, the economizer 22 is connected to the loop during cooling, and the flash evaporator 20 is connected to the loop during heating, which is beneficial to optimize the cooling efficiency and heating efficiency of the air-conditioning system, thereby improving the energy utilization efficiency throughout the year.

[0051] In addition, in common air-source cold water (heat pump) air conditioning systems, since the environment-side heat exchanger is generally a fin-tube heat exchanger and the water-side heat exchanger is generally a plate heat exchanger, and the internal volume of the plate heat exchanger is much smaller than that of the fin-tube heat exchanger, it is necessary to set a liquid reservoir in the refrigerant flow path on the plate heat exchanger side to balance the contradiction that the refrigerant circulation volume during heating is smaller than the refrigerant circulation volume during cooling. For the same air conditioning system, since the internal volume of the flash evaporator 20 is larger and the internal volume of the economizer 22 is smaller, the present invention uses the flash evaporator 20 during heating and the economizer 22 during cooling, which just helps to balance the difference in the refrigerant circulation volume between the cooling and heating operating modes. At the same time, since the refrigerant liquid at the bottom of the flash evaporator 20 can be partially stored in the economizer 22 during heating, the storage space for additional refrigerant is further increased, and the air conditioning system provided by the present invention does not need to set up a separate liquid reservoir, which helps to reduce the cost of the air conditioning system.

[0052] During refrigeration, the flash evaporator 20 can also store medium-pressure gas refrigerant, which is equivalent to a buffer, and can keep the pressure of the gas injected into the middle injection port 12g of the compressor 12 stable, which is beneficial to the stable operation of the compressor 12.

[0053] Preferably, the flash evaporator 20 provided by the present invention is a one-way flash evaporator. Compared with the two-way flash evaporator, the one-way flash evaporator has the advantages of good flashing effect and good gas-liquid separation effect. The dryness of the gas at the outlet of the one-way flash evaporator is large, which ensures the safe and stable operation of the compressor 12 in the intermediate jet state. At the same time, the gas entrained in the liquid at the outlet of the one-way flash evaporator is small, which helps to improve the heat exchange efficiency of the evaporator and the energy efficiency of the air-conditioning system.

[0054] The refrigerant after throttling always enters the flash evaporator 20 from the refrigerant inlet 20a. At this time, due to the sudden increase in volume, the refrigerant liquid flashes, the temperature drops, and becomes a gas-liquid mixture. The liquid falls to the bottom of the flash evaporator 20 under the action of gravity, and flows out of the flash evaporator 20 from the liquid outlet 20c at the bottom, while the refrigerant gas after flashing in the upper part flows out of the flash evaporator 20 from the gas outlet 20b.

[0055] The throttled refrigerant enters the economizer 22 from the third pipe port 22c, the evaporated refrigerant gas flows out of the economizer 22 from the second pipe port 22b, the refrigerant liquid enters the economizer 22 from the fourth pipe port 22d, and the supercooled refrigerant liquid flows out of the economizer 22 from the first pipe port 22a.

[0056] Preferably, the present invention can be used in two-stage compression, injection enthalpy increase, independent compression or any other air conditioning system that requires injection of refrigerant gas at an intermediate pressure into the compressor 12.

[0057] Specifically, one flow path (tube side) is formed between the first tube port 22a and the fourth tube port 22d, and another flow path (shell side) is formed between the second tube port 22b and the third tube port 22c.

[0058] Preferably, the compressor 12 may be a compressor 12 with a single cylinder and a middle injection hole on the cylinder, or may be a compressor 12 with two cylinders.

[0059] In an embodiment provided by the present invention, preferably, the reversing assembly 10 includes a first end 10a to a fourth end 10d, the first end 10a of the reversing assembly 10 is connected to the exhaust port 12d, and the second end 10b of the reversing assembly 10 is connected to the intake port 12s; one end of the indoor heat exchanger 14 is connected to the third end 10c of the reversing assembly 10, and one end of the indoor heat exchanger 14 is connected to the fourth end 10d of the reversing assembly 10.

[0060] In this embodiment, the reversing component 10 includes a first end 10a to a fourth end 10d, that is, a first end 10a, a second end 10b, a third end 10c and a fourth end 10d. The first end 10a of the reversing component 10 is connected to the exhaust port 12d, the second end 10b of the reversing component 10 is connected to the intake port 12s, the third end 10c of the reversing component 10 is connected to one end of the indoor heat exchanger 14, and the fourth end 10d of the reversing component 10 is connected to one end of the indoor heat exchanger 14 to achieve conversion during cooling and heating; specifically, in the cooling state, the first end 10a and the third end 10c of the reversing component 10 are communicated, the second end 10b and the fourth end 10d of the reversing component 10 are communicated, and in the heating state, the first end 10a and the fourth end 10d of the reversing component 10 are communicated, and the second end 10b and the third end 10c of the reversing component 10 are communicated.

[0061] In an embodiment provided by the present invention, preferably, the air conditioning system further includes: a first valve body 24 located between the refrigerant inlet 20 a and the first throttling element 18 .

[0062] In this embodiment, the air-conditioning system also includes a first valve body 24, which is arranged between the refrigerant inlet 20a and the first throttling element 18, so that the first valve body 24 can be controlled to achieve that when the air-conditioning system is heating, the first valve body 24 is opened and the flash evaporator 20 is connected to the circuit, and when the air-conditioning system is cooling, the first valve body 24 is closed and the flash evaporator 20 is not connected to the circuit.

[0063] In an embodiment provided by the present invention, preferably, the air conditioning system further includes: a second valve body 26 located between the first pipe opening 22 a and the first throttling element 18 , and the second valve body 26 is connected in parallel with the first valve body 24 .

[0064] In this embodiment, the air-conditioning system further includes a second valve body 26, which is located between the first pipe opening 22a and the first throttling element 18, and the second valve body 26 is connected in parallel with the first valve body 24, and the second valve body 26 is located on the branch where the economizer 22 is located. When the second valve body 26 is controlled, the air-conditioning system opens the second valve body 26 during cooling and connects the economizer 22 to the circuit, and closes the second valve body 26 during heating and does not connect the economizer 22 to the circuit.

[0065] In an embodiment provided by the present invention, preferably, the air-conditioning system also includes: a second throttling element 28, one end of the second throttling element 28 is respectively connected to the outdoor heat exchanger 16 and the fourth pipe opening 22d, and the other end of the second throttling element 28 is respectively connected to the liquid outlet 20c and the third pipe opening 22c.

[0066] In this embodiment, the air conditioning system further includes a second throttling element 28, one end of which is connected to the outdoor heat exchanger 16 and the fourth pipe port 22d, that is, the outdoor heat exchanger 16 and the fourth pipe port 22d are collected to one end of the second throttling element 28 through a pipeline; the other end of the second throttling element 28 is connected to the liquid outlet 20c and the third pipe port 22c, that is, the liquid outlet 20c and the third pipe port 22c are collected to the other end of the second throttling element 28 through a pipeline; when heating, the second throttling element 28 throttles the refrigerant liquid sent by the flash evaporator 20 for a second time and then reduces the pressure, so that the refrigerant becomes a low-pressure gas-liquid mixture, so that it can subsequently enter the indoor side heat exchanger for evaporation and heat absorption; when cooling, a part of the high-pressure liquid refrigerant from the outdoor heat exchanger 16 is throttled by the second throttling element 28 to become a refrigerant of intermediate pressure, and finally sprayed into the compressor 12 through the intermediate injection port 12g, so as to achieve the enthalpy increase effect of the compressor 12.

[0067] In an embodiment provided by the present invention, preferably, the air conditioning system further includes: a third valve body 30 located between the liquid outlet 20 c and the second throttling element 28 .

[0068] In this embodiment, the air-conditioning system further includes a third valve body 30, which is located between the liquid outlet 20c and the second throttling element 28. When the third valve body 30 is controlled, the third valve body 30 is closed during cooling of the air-conditioning system, and the flash evaporator 20 is not connected to the circuit. The third valve body 30 is opened during heating, and the flash evaporator 20 is connected to the circuit.

[0069] In an embodiment provided by the present invention, preferably, the air conditioning system further comprises: a gas-liquid separator 32, the inlet of the gas-liquid separator 32 is connected to the second end 10b of the reversing assembly 10, and the outlet of the gas-liquid separator 32 is connected to the air intake port 12s.

[0070] In this embodiment, the air-conditioning system also includes a gas-liquid separator 32, the inlet of the gas-liquid separator 32 is connected to the second end 10b of the reversing assembly 10, and the outlet of the gas-liquid separator 32 is connected to the air intake port 12s, so that the refrigerant can be separated into gas and liquid when passing through the gas-liquid separator 32, thereby protecting the compressor 12.

[0071] In an embodiment provided by the present invention, preferably, the first valve body 24 is a solenoid valve.

[0072] In an embodiment provided by the present invention, preferably, the second valve body 26 is a one-way valve, and the conducting direction of the second valve body 26 is from the economizer 22 to the first throttling element 18 .

[0073] In this embodiment, the second valve body 26 is configured as a one-way valve, and the conduction direction of the second valve body 26 is from the economizer 22 to the first throttling element 18, so that the refrigerant can only be conducted from the economizer 22 to the first throttling element 18, thereby preventing the refrigerant from flowing into the economizer 22 during heating.

[0074] It is conceivable that the second valve body 26 can also be set as a solenoid valve, and the one-way conduction effect can be achieved by controlling it.

[0075] In an embodiment provided by the present invention, preferably, the third valve body 30 is a one-way valve, and the conducting direction of the third valve body 30 is from the flash evaporator 20 to the second throttling element 28 .

[0076] In this embodiment, the third valve body 30 is configured as a one-way valve, and the conduction direction of the third valve body 30 is from the flash evaporator 20 to the second throttling element 28, so that the refrigerant can only be conducted from the flash evaporator 20 to the second throttling element 28, thereby preventing the refrigerant from flowing into the flash evaporator 20 during refrigeration.

[0077] In an embodiment provided by the present invention, preferably, the first throttling element 18 is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube.

[0078] In an embodiment provided by the present invention, preferably, the second throttling element 28 is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube.

[0079] In one embodiment provided by the present invention, preferably, the flash evaporator 20 and the economizer 22 are both arranged vertically; and the installation heights of the flash evaporator 20 and the economizer 22 are the same.

[0080] In this embodiment, the flash evaporator 20 and the economizer 22 are both arranged vertically, and the installation heights of the flash evaporator 20 and the economizer 22 are set to be the same. In the heating mode, a part of the liquid refrigerant flowing through the third valve body 30 will enter the economizer 22 through the third pipe opening 22c of the economizer 22. Since the economizer 22 and the flash evaporator 20 are installed at the same height, and the gas outlet 20b of the flash evaporator 20 is connected to the fourth pipe opening 22d of the economizer 22, the space inside the shell of the economizer 22 and the shell side space of the flash evaporator 20 will be in a communicating vessel state with the same pressure, that is, the liquid level in the flash evaporator 20 will be nearly equal to the shell side liquid level in the economizer 22. At this time, the economizer 22 is equivalent to a liquid storage tank, which can store the refrigerant liquid that does not participate in the circulation in the system.

[0081] like Figure 1 and Figure 3 As shown, in the heating mode, the four-way valve is in the first conduction state, and the first valve body 24 is in the conduction state. At this time, the circulation path of the refrigerant outside the compressor 12 is: the high-pressure refrigerant gas passes through the exhaust port 12d of the compressor 12, the first end 10a of the four-way valve, and the third end 10c of the four-way valve in sequence, and enters the indoor heat exchanger 14. In the indoor heat exchanger 14, the refrigerant is condensed into a high-pressure liquid, and heat is released at the same time to heat the indoor air (i.e., to produce a heating effect). After the high-pressure refrigerant liquid passes through the first throttling element 18 in sequence, the pressure is reduced and becomes a refrigerant of a certain intermediate pressure. This intermediate pressure refrigerant enters the flash evaporator 20 through the first valve body 24 and the refrigerant inlet 20a of the flash evaporator 20. In the flash evaporator 20, the medium-pressure refrigerant flashes and separates, wherein the separated medium-pressure refrigerant liquid enters the second throttling element 28 through the liquid outlet 20c and the third valve body 30, and the pressure is further reduced after the second throttling of the second throttling element 28, and becomes a low-pressure gas-liquid mixture. This low-pressure gas-liquid mixture enters the outdoor heat exchanger 16, where the refrigerant evaporates and absorbs heat to become a low-pressure gas, and finally returns to the compressor 12 through the fourth end 10d of the four-way valve, the second end 10b of the four-way valve, and the air intake 12s of the compressor 12. The intermediate-pressure refrigerant gas flashed and separated in the flash evaporator 20 flows out of the flash evaporator 20 through the air outlet 20b of the flash evaporator 20, and then returns to the compressor 12 through the intermediate air injection port 12g of the compressor 12, thereby forming a complete heating cycle.

[0082] In the heating mode, since the outlet end of the second valve body 26 is in an intermediate pressure state and the inlet end of the second valve body 26 is in a low pressure state, the second valve body 26 will be in a cut-off state.

[0083] In the heating mode, part of the liquid refrigerant flowing through the third valve body 30 will enter the economizer 22 through the third pipe port 22c of the economizer 22. Since the economizer 22 and the flash evaporator 20 are installed at the same height, and the gas outlet 20b of the flash evaporator 20 is connected to the fourth pipe port 22d of the economizer 22, the space inside the shell of the economizer 22 and the shell side space of the flash evaporator 20 will be in a communicating vessel state with the same pressure, that is, the liquid level in the flash evaporator 20 will be nearly equal to the shell side liquid level in the economizer 22. At this time, the economizer 22 is equivalent to a liquid storage tank, which can store the refrigerant liquid that does not participate in the circulation in the system.

[0084] like Figure 2 and Figure 4 As shown, in the cooling mode, the four-way valve is in the second conduction state, and the first valve body 24 is in the closed state. At this time, the circulation path of the refrigerant outside the compressor 12 is: the high-pressure refrigerant gas passes through the exhaust port 12d of the compressor 12, the first end 10a of the four-way valve, and the fourth end 10d of the four-way valve in sequence, and enters the outdoor heat exchanger 16, where the refrigerant is condensed into high-pressure liquid. The high-pressure liquid flowing out of the outdoor heat exchanger 16 is divided into two paths:

[0085] After being throttled by the second throttling element 28, the first refrigerant liquid becomes a refrigerant of a certain intermediate pressure. This intermediate pressure refrigerant enters the shell side of the economizer 22 through the third pipe port 22c of the economizer 22. On the shell side of the economizer 22, the medium pressure refrigerant evaporates and cools the refrigerant on the pipe side of the economizer 22. The evaporated medium pressure refrigerant gas is sprayed into the compressor 12 through the intermediate jet port 12g of the compressor 12. Part of the medium pressure refrigerant gas will enter the upper part of the flash evaporator 20, but because the pressures of the gas outlet 20b and the liquid outlet 20c of the flash evaporator 20 are equal, the third valve body 30 is closed. At this time, the flash evaporator 20 plays the role of storing the medium pressure gas refrigerant, which is equivalent to a buffer, and can keep the gas pressure sprayed into the intermediate jet port 12g of the compressor 12 stable.

[0086] The second refrigerant liquid passes through the fourth pipe port 22d of the economizer 22, the tube side of the economizer 22, the first pipe port 22a of the economizer 22, the second valve body 26, and the first throttling element 18 in sequence to enter the indoor heat exchanger 14. On the tube side of the economizer 22, the refrigerant is cooled by the refrigerant evaporated on the shell side, and the degree of supercooling increases. When the supercooled refrigerant liquid passes through the first throttling element 18, it is throttled and depressurized to become a low-pressure gas-liquid mixture. This low-pressure gas-liquid mixture evaporates and absorbs heat in the indoor heat exchanger 14, cooling the indoor air (i.e., producing a refrigeration effect). The evaporated refrigerant becomes a low-pressure gas, and finally returns to the compressor 12 through the third end 10c, the second end 10b, and the air intake 12s of the compressor 12 of the four-way valve. This constitutes a complete heating cycle.

[0087] The indoor heat exchanger 14 of the present invention is not limited in type, and can be a refrigerant-air heat exchanger or a refrigerant-water heat exchanger. Similarly, the outdoor heat exchanger 16 is not limited in type, and can be a refrigerant-air heat exchanger or a refrigerant-water heat exchanger.

[0088] In the air-conditioning system of the present invention, when heating, the refrigerant enters the flash evaporator 20 from the same inlet and flows out of the flash evaporator 20 from the same outlet. Therefore, the flash evaporator 20 works stably and the liquid level in the flash evaporator 20 will not be unstable, thereby avoiding the entry of liquid droplets from the middle jet port 12g of the compressor 12 and the mixing of gas into the outlet of the flash evaporator 20, thereby ensuring the safe operation of the compressor 12 and improving the heat exchange efficiency. At the same time, the economizer 22 plays the role of a liquid reservoir when heating, which is conducive to solving the contradiction of different refrigerant circulation amounts during heating and cooling. There is no need to set up a separate liquid reservoir in the system, thereby reducing the system cost.

[0089] During refrigeration, the flash evaporator 20 plays the role of storing medium-pressure gas refrigerant, which is equivalent to a buffer, and can keep the pressure of the gas injected into the middle injection port 12g of the compressor 12 stable, which is beneficial to the stable operation of the compressor 12.

[0090] In the description of this specification, the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "connect", "install", "fixed", etc. should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises a reversing assembly, an indoor heat exchanger and an outdoor heat exchanger, and the air conditioning system further comprises: A compressor, including an exhaust port, an intermediate jet port and an intake port; a first throttling element, disposed between the indoor heat exchanger and the outdoor heat exchanger; a flash evaporator, arranged between the first throttling element and the outdoor heat exchanger, the flash evaporator comprising a refrigerant inlet, a gas outlet and a liquid outlet, the refrigerant inlet is connected to the first throttling element, and the liquid outlet is connected to the outdoor heat exchanger; an economizer, arranged in parallel with the flash evaporator, the economizer comprising a first pipe opening, a second pipe opening, a third pipe opening and a fourth pipe opening, the first pipe opening being connected to the first throttling element, the second pipe opening and the air outlet being connected to the intermediate air jet, the third pipe opening and the fourth pipe opening being connected to the outdoor heat exchanger; The air conditioning system further includes a first valve body located between the refrigerant inlet and the first throttling element; The air conditioning system further comprises a second valve body, which is located between the first pipe opening and the first throttling element, and the second valve body is connected in parallel with the first valve body, and the second valve body is located on the branch where the economizer is located. When the second valve body is controlled, when the air conditioning system is in cooling mode, the second valve body is opened to connect the economizer to the circuit, and when the air conditioning system is in heating mode, the second valve body is closed to not connect the economizer to the circuit. The air conditioning system further comprises a second throttling element, one end of which is connected to the outdoor heat exchanger and the fourth pipe opening, and the other end of which is connected to the liquid outlet and the third pipe opening; The air conditioning system further comprises a third valve body, which is located between the liquid outlet and the second throttling element. When the air conditioning system is in cooling mode, the third valve body is closed and the flash evaporator is not connected to the circuit. When the air conditioning system is in heating mode, the third valve body is opened and the flash evaporator is connected to the circuit.

2. The air conditioning system according to claim 1, characterized in that: The reversing assembly includes a first end to a fourth end, the first end of the reversing assembly is connected to the exhaust port, and the second end of the reversing assembly is connected to the intake port; One end of the indoor heat exchanger is connected to the third end of the reversing assembly, and one end of the indoor heat exchanger is connected to the fourth end of the reversing assembly.

3. The air conditioning system according to claim 2, characterized in that: The air conditioning system further comprises: A gas-liquid separator, wherein the inlet of the gas-liquid separator is connected to the second end of the reversing component, and the outlet of the gas-liquid separator is connected to the air intake port.

4. The air conditioning system according to claim 1, characterized in that: The first valve body is a solenoid valve; and / or The second valve body is a one-way valve, and the conducting direction of the second valve body is from the economizer to the first throttling element.

5. The air conditioning system according to claim 1, characterized in that: The third valve body is a one-way valve, and the conducting direction of the third valve body is from the flash evaporator to the second throttling element.

6. The air conditioning system according to claim 1, characterized in that: The first throttling element is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube; and / or The second throttling element is any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, and a throttling short tube.

7. The air conditioning system according to any one of claims 1 to 6, characterized in that: The flash evaporator and the economizer are both arranged vertically; The flash evaporator and the economizer are installed at the same height.

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