Air conditioner

Abstract

The utility model provides an air conditioner which comprises a compressor, an oil separator, an oil return cooling device, an oil return system and an oil temperature detection device, the compressor is provided with an air suction port, and the compressor is configured to compress refrigerants. The oil separator is provided with an oil return opening. The oil return cooling device is configured to cool oil flowing out of the oil return opening through refrigerants. And the oil return system is communicated with the oil return port and the air suction port, and is configured to controllably enable oil flowing out of the oil separator to enter the air suction port after being cooled by the oil return cooling device or not passing through the oil return cooling device. The oil temperature detection device is arranged on the oil return system and is configured to detect the temperature of oil flowing out of the oil separator so as to control the oil return system at least according to the temperature detected by the oil temperature detection device. According to the air conditioner, the problems that the exhaust temperature of the compressor is high and the outdoor heat exchanger is frosted are solved, and the effect of reducing the exhaust temperature of the compressor is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner technical field especially is related to an air conditioner. BACKGROUND

[0002] Air conditioner is the device that utilizes artificial means to adjust and control the temperature and humidity of environment air in building or structure. Generally, air conditioner includes indoor unit, outdoor unit and the circulating loop for connecting indoor unit and outdoor unit, and the refrigerant in air conditioner is continuously heat exchanged between outdoor unit and indoor unit through circulating loop, so as to achieve the effect of changing room temperature. At the same time, the refrigerant needs the auxiliary action of compressor to realize in the process of gas-liquid change, and the existing part of compressor must use lubricating oil to stabilize work in the process of compressing refrigerant, and these lubricating oils will enter the refrigerant circulating pipeline along with the refrigerant. In order to send these lubricating oils back to the compressor, the oil separator is usually arranged downstream of the compressor to separate the lubricating oil in the refrigerant, and then the lubricating oil in the oil separator is introduced into the compressor again to ensure the normal work of the compressor.

[0003] However, since the temperature of the lubricating oil in the oil separator is the same as the refrigerant temperature on the exhaust side of the compressor, the lubricating oil flowing out of the oil separator has a high temperature, and directly introducing the high-temperature lubricating oil into the compressor will inevitably cause the suction temperature of the compressor to rise sharply, and in turn cause the exhaust temperature of the compressor to rise. And when the air conditioner is running in heating mode, the heat exchanger on the outdoor side will have frost, especially in areas with low temperature and high humidity, the heating capacity will be greatly attenuated, and during the defrosting process, the indoor unit cannot blow hot air flow, causing fluctuations in the indoor ambient temperature. SUMMARY

[0004] In view of the above problems, the utility model is proposed to provide an air conditioner that overcomes the above problems or at least partially solves the above problems.

[0005] One object of the utility model is to solve the problem of high exhaust temperature of the compressor and frost formation on the outdoor heat exchanger, and to achieve the effect of reducing the exhaust temperature of the compressor.

[0006] Another object of the utility model is to solve the problem of frost formation on the outdoor heat exchanger when the air conditioner is running in heating mode, and to achieve the effect of slowing down the frost formation on the outdoor heat exchanger.

[0007] Specifically, the utility model provides an air conditioner, comprising:

[0008] a compressor having a suction port, the compressor being configured to compress refrigerant;

[0009] an oil separator having an oil return port;

[0010] an oil return cooling device configured to cool the oil flowing out of the oil return port by using the refrigerant;

[0011] an oil return system communicating with the oil return port and the suction port, and configured to control the oil flowing out of the oil separator to enter the suction port with or without being cooled by the oil return cooling device;

[0012] an oil temperature detecting device arranged on the oil return system and configured to detect the temperature of the oil flowing out of the oil separator, so as to control the oil return system according to at least the temperature detected by the oil temperature detecting device.

[0013] Optionally, the air conditioner further comprises:

[0014] a first heat exchanger communicating with the refrigerant outlet of the oil separator;

[0015] a first throttling device, the inlet of which communicates with the outlet of the first heat exchanger;

[0016] the oil return cooling device is arranged between the first heat exchanger and the first throttling device, and is configured to cool the oil flowing out of the oil return port by using the refrigerant flowing out of the first heat exchanger, so as to increase the temperature of the refrigerant entering the first throttling device.

[0017] Optionally, the oil return cooling device comprises:

[0018] a refrigerant pipeline configured to circulate the refrigerant, the inlet of which communicates with the outlet of the first heat exchanger, and the outlet of which communicates with the inlet of the first throttling device;

[0019] a heat exchange oil pipeline connected to the oil return system; the heat exchange oil pipeline is configured to be in thermal connection with the refrigerant pipeline; and the oil temperature detecting device is arranged adjacent to the inlet of the heat exchange oil pipeline.

[0020] Optionally, the air conditioner further comprises:

[0021] a first refrigerant temperature detecting device arranged at the inlet of the refrigerant pipeline, so as to control the oil return system according to at least the temperatures detected by the oil temperature detecting device and the first refrigerant temperature detecting device.

[0022] Optionally, the air conditioner further comprises:

[0023] a second refrigerant temperature detecting device arranged at the outlet of the refrigerant pipeline, so as to control the oil return system according to at least the temperatures detected by the oil temperature detecting device, the first refrigerant temperature detecting device and the second refrigerant temperature detecting device.

[0024] Optionally, the oil return system comprises:

[0025] a first oil return branch, one end of the first oil return branch being connected to the oil return port, and the other end being connected to the air inlet port;

[0026] a first valve provided on the first oil return branch;

[0027] a second oil return branch, the second oil return branch comprising a first pipe section and a second pipe section; one end of the first pipe section being connected to the oil return port, and the other end being connected to the inlet of the heat exchange oil pipe; one end of the second pipe section being connected to the outlet of the heat exchange oil pipe, and the other end being connected to the air inlet port;

[0028] a second valve provided on the first pipe section.

[0029] Optionally, a first oil return capillary tube is provided on the first oil return branch, the first oil return capillary tube being on the downstream side of the first valve;

[0030] a second oil return capillary tube is provided on the first pipe section of the second oil return branch, the second oil return capillary tube being on the downstream side of the second valve;

[0031] the oil temperature detection device is provided on the first pipe section and on the upstream side of the second valve; or,

[0032] the oil temperature detection device is provided on the first oil return branch and on the upstream side of the first valve; or,

[0033] the oil temperature detection device is provided on the first oil return branch and on the upstream side of the first valve; or,

[0034] Optionally, the oil return system comprises:

[0035] a bypass oil pipe;

[0036] a first oil return main pipe, one end of the first oil return main pipe being connected to the oil return port, and the other end of the first oil return main pipe being connected to the inlet of the heat exchange oil pipe and the inlet of the bypass oil pipe;

[0037] a third oil return capillary tube provided on the first oil return main pipe; the oil temperature detection device is provided on the first oil return main pipe and on the downstream side of the third oil return capillary tube;

[0038] a second oil return pipe, one end of the second oil return pipe being connected to the suction port, the other end of the second oil return pipe being connected to the outlet of the heat exchange oil pipe and the outlet of the bypass oil pipe;

[0039] a valve device configured to controllably enable the bypass oil pipe and the heat exchange oil pipe alternatively.

[0040] Optionally, the air conditioner further comprises:

[0041] a four-way valve, the first heat exchanger and the refrigerant outlet of the oil separator being communicated through the four-way valve;

[0042] a second heat exchanger, the inlet of the second heat exchanger being communicated with the outlet of the first throttling device, the outlet of the second heat exchanger being communicated with the suction port through the four-way valve;

[0043] a second throttling device, arranged between the first heat exchanger and the first throttling device.

[0044] Optionally, the air conditioner further comprises:

[0045] a gas-liquid separator, the four-way valve being communicated with the suction port through the gas-liquid separator;

[0046] an ejector cooling branch, one end of the ejector cooling branch being communicated with the gas-liquid separator, the other end of the ejector cooling branch being connected between the second throttling device and the first throttling device;

[0047] an ejector valve, arranged on the ejector cooling branch;

[0048] an ejector valve state detection device, configured to detect the opening information of the ejector valve, so as to control the oil return system according to the opening information of the ejector valve;

[0049] an exhaust temperature detection device, arranged on the exhaust pipeline of the compressor, so as to control the oil return system according to the detected temperature;

[0050] an exhaust pressure detection device, arranged on the exhaust pipeline of the compressor, so as to control the oil return system according to the detected pressure.

[0051] The utility model discloses a kind of air conditioners, because air conditioner includes compressor, oil separator, oil return cooling device and oil return system, compressor is compressed into high-temperature high-pressure refrigerant flow when working low-temperature low-pressure refrigerant, in this process, along with refrigerant together flow out. Oil and refrigerant enter oil separation and separate. After separation, oil flows out through oil return port, and oil temperature detection device detects the temperature of oil. If the temperature of oil meets preset condition, then control oil is cooled through oil return cooling device, and enters compressor through suction port. Otherwise, oil directly enters compressor from suction port, without passing through oil return cooling device. Wherein, preset condition can be that the temperature of oil exceeds first preset temperature, and first preset temperature can be determined according to oil temperature experience table. The air conditioner of the utility model judges whether the oil separated by oil separator needs to be cooled through oil temperature detection device, and enters compressor after cooling through oil return cooling device when needing to be cooled, directly enters compressor without needing to be cooled, effectively reduce the temperature of oil, prevent oil from entering compressor when temperature is higher, to avoid the problem that compressor exhaust temperature is high, and further guarantee that compressor is normally and stably operated.

[0052] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of some embodiments thereof, when considered in conjunction with the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0053] Some embodiments of the present application will now be described in detail with reference to the drawings, which are by way of illustration only and in which:

[0054] Figure 1 is a system diagram of air conditioner according to one embodiment of the utility model;

[0055] Figure 2 is a system diagram of air conditioner according to another embodiment of the utility model;

[0056] Figure 3 is a system diagram of oil return system according to another embodiment of the utility model. DETAILED DESCRIPTION

[0057] Reference will now be made to Figures 1 to 3An air conditioner according to an embodiment of the present application is described. In the description of the embodiments, it will be understood that the terms "first", "second", "third" and the like, do not imply a relative importance or a specific order of precedence but are used to distinguish one element from another. Thus, a feature specified as "first" can imply the presence of at least one such feature, i.e. one or more such features. In the description of the embodiments, the term "plurality" means at least two, e.g. two, three, etc., unless explicitly specified otherwise. When a certain feature "comprises" or "includes" a certain element or elements, this indicates that the feature can further include other elements, unless specifically stated otherwise.

[0058] Unless specifically stated otherwise, the terms "set", "mounted", "connected", "coupled", "fixed", "coupling" and the like, are to be construed broadly, e.g. as in a fixed connection, or as in a detachable connection, or as in one piece; as in a mechanical connection, or as in an electrical connection; as in a direct connection, or as in an indirect connection via an intermediate medium; as in a communication between the internal parts of two elements, or as in an interaction between two elements, unless specifically stated otherwise. A person of ordinary skill in the art should be able to understand the specific meaning of the above terms in the context of the present application according to the specific circumstances.

[0059] In addition, in the description of the embodiments, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. That is, in the description of the embodiments, the first feature "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" or "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0060] In the description of the embodiments, the description of the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the embodiments, the illustrative description 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.

[0061] Figure 1 is a system diagram of an air conditioner according to an embodiment of the present application, as Figure 1As shown, and with reference to Figure 2 and Figure 3 The dashed box in which the first heat exchanger 610 is located is the indoor side, and the dashed box in which the second heat exchanger 620 is located is the outdoor side. The air conditioner 100 according to the embodiments of the present application comprises a compressor 10, an oil separator 20, an oil return cooling device 30, an oil return system, and an oil temperature detection device 510. The compressor 10 has a suction port 110, and is configured to compress refrigerant. The oil separator 20 has an oil return port 210. The oil return cooling device 30 is configured to cool the oil flowing out of the oil return port 210 using the refrigerant. The oil return system is in communication with the oil return port 210 and the suction port 110, and is configured to allow the oil flowing out of the oil separator 20 to enter the suction port 110 after being cooled by the oil return cooling device 30 or without passing through the oil return cooling device 30. The oil temperature detection device 510 is arranged on the oil return system and is configured to detect the temperature of the oil flowing out of the oil separator 20, so as to control the oil return system according to at least the temperature detected by the oil temperature detection device 510.

[0062] In the embodiments, the air conditioner 100 comprises the compressor 10, the oil separator 20, the oil return cooling device 30, and the oil return system. The compressor 10 compresses low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant during operation, and the oil flows out together with the refrigerant in the process. The oil and the refrigerant enter the oil separator 20 for separation. The separated oil flows out through the oil return port 210, and the oil temperature detection device 510 detects the temperature of the oil. If the temperature of the oil meets a preset condition, the oil is cooled by the oil return cooling device 30 and enters the compressor 10 through the suction port 110. Otherwise, the oil directly enters the compressor 10 without passing through the oil return cooling device 30. The preset condition can be that the temperature of the oil exceeds a first preset temperature, which can be determined according to an oil temperature experience table. The air conditioner 100 according to the present application judges whether the oil separated by the oil separator 20 needs to be cooled by the oil temperature detection device 510. When the oil needs to be cooled, the oil is cooled by the oil return cooling device 30 before entering the compressor 10. When the oil does not need to be cooled, the oil directly enters the compressor 10. The temperature of the oil is effectively reduced, and the problem of high exhaust temperature of the compressor 10 is avoided, thereby ensuring the normal and stable operation of the compressor 10.

[0063] In some embodiments of the present application, as shown in Figure 1 The air conditioner 100 further comprises a first heat exchanger 610 and a first throttling device 630. The first heat exchanger 610 is in communication with the refrigerant outlet of the oil separator 20. The inlet of the first throttling device 630 is in communication with the outlet of the first heat exchanger 610. The oil return cooling device 30 is arranged between the first heat exchanger 610 and the first throttling device 630, and is configured to cool the oil flowing out of the oil return port 210 using the refrigerant flowing out of the first heat exchanger 610, so as to increase the temperature of the refrigerant entering the first throttling device 630.

[0064] In the embodiment, the air conditioner 100 further comprises a first heat exchanger 610 and a first throttling device 630. When the air conditioner 100 is running, the refrigerant exchanges heat with the air flow through the first heat exchanger 610, the air flow absorbs heat and blows out hot air flow, the refrigerant releases heat and the temperature is lowered, and the refrigerant flows from the first heat exchanger 610 to the first throttling device 630. The oil return and temperature reduction device 30 is arranged between the first heat exchanger 610 and the first throttling device 630. The high-temperature oil separated from the oil separator 20 exchanges heat with the refrigerant, the temperature of the oil is lowered after heat exchange, and then the oil enters the compressor 10. The temperature of the refrigerant is raised, and then the refrigerant flows to the first throttling device 630. The high-temperature oil is used to heat the refrigerant, the temperature of the oil is effectively lowered, the temperature of the oil entering the compressor 10 is prevented from being too high, the problem of high exhaust temperature of the compressor 10 is avoided, and the stable operation of the compressor 10 is ensured. At the same time, the heat of the oil is used to raise the temperature of the refrigerant, the oil return system is always returning oil, the temperature of the refrigerant is raised, the problem of frost caused by low-temperature refrigerant flowing through other devices is alleviated, waste heat is reasonably utilized, energy utilization efficiency is improved, and the cost of the air conditioner 100 is saved.

[0065] In some embodiments of the utility model, as shown in Figure 1 The oil return and temperature reduction device 30 comprises a refrigerant pipeline 310 and a heat exchange oil pipeline 320. The refrigerant pipeline 310 is configured to circulate refrigerant. The inlet of the refrigerant pipeline 310 is in communication with the outlet of the first heat exchanger 610, and the outlet of the refrigerant pipeline 310 is in communication with the inlet of the first throttling device 630. The heat exchange oil pipeline 320 is connected to the oil return system, and is configured to be in thermal connection with the refrigerant pipeline 310. The oil temperature detection device 510 is arranged adjacent to the inlet of the heat exchange oil pipeline 320.

[0066] In the embodiment, the oil return and temperature reduction device 30 comprises a refrigerant pipeline 310 and a heat exchange oil pipeline 320. The inlet side of the refrigerant pipeline 310 is connected to the first heat exchanger 610, and the outlet side is connected to the first throttling device 630. The heat exchange oil pipeline 320 is connected to the oil return system, and the oil temperature detection device 510 is arranged at the inlet of the heat exchange oil pipeline 320. The refrigerant flows out of the first heat exchanger 610, flows to the first throttling device 630 through the refrigerant pipeline 310, and the temperature of the refrigerant in the refrigerant pipeline 310 is relatively low. The oil flows out of the oil separator 20 and enters the heat exchange oil pipeline 320, and the temperature of the oil in the heat exchange oil pipeline 320 is relatively high. The heat exchange oil pipeline 320 is in thermal connection with the refrigerant pipeline 310. The oil in the heat exchange oil pipeline 320 is used to heat the refrigerant in the refrigerant pipeline 310, so that the temperature of the oil is lowered and the temperature of the refrigerant is raised. The structure of the oil return and temperature reduction device 30 is simple, and the processing and installation of the air conditioner 100 are facilitated, and the cost is reduced.

[0067] In some embodiments of the utility model, as shown in Figure 1As shown, the air conditioner 100 further comprises a first refrigerant temperature detection device 520, which is arranged at the inlet of the refrigerant pipeline 310, so as to control the oil return system according to at least the temperatures detected by the oil temperature detection device 510 and the first refrigerant temperature detection device 520.

[0068] In this embodiment, the air conditioner 100 comprises a first refrigerant temperature detection device 520, which is used to detect the temperature of the refrigerant at the inlet of the refrigerant pipeline 310. When determining whether the oil flowing out of the oil separator 20 needs to be cooled, the temperature of the refrigerant at the inlet of the refrigerant pipeline is compared with the temperature of the oil at the inlet of the heat exchange oil pipeline 320. When the temperature of the oil at the inlet of the heat exchange oil pipeline 320 is higher than the temperature of the refrigerant at the inlet of the refrigerant pipeline, the oil is controlled to pass through the oil return cooling device 30 for cooling. Otherwise, the oil directly enters the compressor 10 from the suction port 110 without passing through the oil return cooling device 30. The oil return system is controlled by comparing the temperature of the refrigerant at the inlet of the refrigerant pipeline with the temperature of the oil at the inlet of the heat exchange oil pipeline, so that the control of the oil return system is more accurate, the heat exchange efficiency of the oil and the refrigerant is improved, and the working efficiency of the air conditioner 100 is further improved.

[0069] In some embodiments of the present application, Figure 1 As shown, the air conditioner 100 further comprises a second refrigerant temperature detection device 530, which is arranged at the outlet of the refrigerant pipeline 310, so as to control the oil return system according to at least the temperatures detected by the oil temperature detection device 510, the first refrigerant temperature detection device 520 and the second refrigerant temperature detection device 530.

[0070] In this embodiment, the air conditioner 100 further comprises a second refrigerant temperature detection device 530 arranged at the outlet of the refrigerant pipeline 310. When determining whether the oil flowing out of the oil separator 20 needs to be cooled, the temperature at the inlet of the refrigerant pipeline 310 is compared with the temperature at the outlet of the refrigerant pipeline 310. When the temperature difference between the two temperatures is small, the oil directly enters the compressor 10 from the suction port 110 without passing through the oil return cooling device 30. Otherwise, the oil is controlled to pass through the oil return cooling device 30 for cooling. The oil return system is controlled according to the temperatures of the refrigerant at the inlet and outlet of the refrigerant pipeline 310. When the temperature difference between the refrigerant at the inlet and outlet of the refrigerant pipeline 310 is small, the heating effect of the oil on the refrigerant is not obvious at this time, that is, the temperature of the oil is close to the temperature of the refrigerant, so that the oil does not need to be cooled, and the control process of the oil return system is further more accurate, the heat exchange efficiency of the oil and the refrigerant is improved, and the working efficiency of the air conditioner 100 is further improved.

[0071] In some embodiments of the present application, Figure 1As shown, the oil return system comprises a first oil return branch 410, a first valve 471, a second oil return branch 420 and a second valve 472. One end of the first oil return branch 410 is connected to the oil return port 210, and the other end is connected to the suction port 110. The first valve 471 is arranged on the first oil return branch 410. The second oil return branch 420 comprises a first pipe section 421 and a second pipe section 422. One end of the first pipe section 421 is connected to the oil return port 210, and the other end is connected to the inlet of the heat exchange oil pipe 320. One end of the second pipe section 422 is connected to the outlet of the heat exchange oil pipe 320, and the other end is connected to the suction port 110. The second valve 472 is arranged on the first pipe section 421.

[0072] In this embodiment, the oil return system comprises a first oil return branch 410 and a second oil return branch 420. The first valve 471 is arranged on the first oil return branch 410 to control the opening and closing of the first oil return branch 410. The second oil return branch 420 comprises a first pipe section 421 and a second pipe section 422. The second valve 472 is arranged on the first pipe section 421 to control the opening and closing of the second oil return branch 420. When the oil is not cooled, the second valve 472 is closed, and the first valve 471 is opened. The oil flows from the oil return port 210 of the oil separator 20, passes through the first oil return branch 410, and enters the compressor 10 from the suction port 110. When the oil is cooled, the first valve 471 is closed, and the second valve 472 is opened. The oil flows from the oil return port 210 of the oil separator 20, passes through the first pipe section 421, enters the heat exchange oil pipe 320, exchanges heat in the heat exchange oil pipe 320, flows out from the second pipe section 422, and enters the compressor 10 from the suction port 110. The structure of the oil return system is simple, and the control of the first oil return branch 410 and the second oil return branch 420 is convenient

[0073] In some embodiments of the utility model, as shown in the drawings, Figure 1 As shown, the first oil return branch 410 is provided with a first oil return capillary tube 461, and the first oil return capillary tube 461 is located on the downstream side of the first valve 471. The first pipe section 421 of the second oil return branch 420 is provided with a second oil return capillary tube 462, and the second oil return capillary tube 462 is located on the downstream side of the second valve 472.

[0074] In the embodiment, the first oil return branch 410 is provided with a first oil return capillary tube 461, and the second oil return branch 420 is provided with a second oil return capillary tube 462. When the first oil return branch 410 is conducted, the oil separated by the oil separator 20 passes through the first oil return capillary tube 461, and at this time, the pressure of the oil is high, the first oil return capillary tube 461 plays a role of throttling and reducing pressure, reduces the pressure of the oil, and controls the flow of the oil. When the second oil return branch 420 is conducted, the second oil return capillary tube 462 plays a role of throttling and reducing pressure, reduces the pressure of the oil, and controls the flow of the oil. Through the first oil return capillary tube 461 and the second oil return capillary tube 462, the pressure of the oil is reduced, the flow of the oil is controlled, the pressure and the flow of the oil entering the compressor 10 are prevented from being too large, the performance of the compressor 10 is prevented from being affected, and the operation of the compressor 10 is more stable.

[0075] In some embodiments of the utility model, as shown in Figure 2 The oil temperature detection device 510 is arranged on the first pipe section 421 and is located on the upstream side of the second valve 472.

[0076] In the embodiment, the oil temperature detection device 510 is arranged on the first pipe section 421, that is, the temperature detected by the oil temperature detection device 510 is the temperature of the oil separated by the oil separator 20. When the second oil return branch 420 is conducted, the oil return system is controlled according to the temperature of the oil at the inlet side of the heat exchange oil pipe 320.

[0077] In some embodiments of the utility model, the oil temperature detection device 510 is arranged on the first oil return branch 410 and is located on the upstream side of the first valve 471.

[0078] In the embodiment, the first oil return branch 410 is provided with a temperature detection device, and the oil temperature detection device 510 is located on the upstream side of the first valve 471, that is, the temperature detected by the oil temperature detection device 510 is the temperature of the oil separated by the oil separator 20.

[0079] In some embodiments of the utility model, as shown in Figure 1 The oil temperature detection device 510 is two, one is arranged on the first pipe section 421 and is located on the downstream side of the second valve 472 or the second oil return capillary tube 462, and the other is arranged on the first oil return branch 410 and is located on the downstream side of the first valve 471 or the first oil return capillary tube 461.

[0080] In the embodiment, the operation of the first valve 471 and the second valve 472 can cause the change of the flow state of the oil, thereby affecting the reading of the oil temperature detection device 510. The first return oil capillary 461 and the second return oil capillary 462 have the functions of throttling and pressure reduction, and also have the influence on the temperature of the oil. Therefore, one oil temperature detection device 510 is installed on the downstream side of the second valve 472 or the second return oil capillary 462, and another oil temperature detection device 510 is installed on the downstream side of the first valve 471 or the first return oil capillary 461, and the temperature detected by the oil temperature detection device 510 is the temperature after the adjustment of the first valve 471, the first return oil capillary 461, the second valve 472 or the second return oil capillary 462, so that the temperature detected by the oil temperature detection device 510 is more accurate, and the return oil system is more accurately controlled.

[0081] In some embodiments of the utility model, as shown in Figure 3 The oil return system includes a bypass oil pipe 430, a first return oil main pipe 440, a third return oil capillary 463, a second return oil main pipe 450 and a valve device. One end of the first return oil main pipe 440 is connected to the oil return port 210, and the other end of the first return oil main pipe 440 is connected to the inlet of the heat exchange oil pipe 320 and the inlet of the bypass oil pipe 430. The third return oil capillary 463 is arranged on the first return oil main pipe 440. The oil temperature detection device 510 is arranged on the first return oil main pipe 440 and located on the downstream side of the third return oil capillary 463. One end of the second return oil main pipe 450 is connected to the air suction port 110, and the other end of the first return oil main pipe 440 is connected to the outlet of the heat exchange oil pipe 320 and the outlet of the bypass oil pipe 430. The valve device is configured to selectively conduct the bypass oil pipe 430 and the heat exchange oil pipe 320 under control.

[0082] In the embodiment, the inlet of the first oil return pipe 440 is connected to the oil return port 210, the outlet of the first oil return pipe 440 is connected to the inlet of the heat exchange oil pipe 320, the outlet of the heat exchange oil pipe 320 is connected to the inlet of the second oil return pipe 450, and the outlet of the second oil return pipe 450 is connected to the suction port 110. The inlet of the bypass oil pipe 430 is connected to the outlet of the first oil return pipe 440, and the outlet of the bypass oil pipe 430 is connected to the inlet of the second oil return pipe 450. When the oil is cooled, the heat exchange oil pipe 320 is made to be in conduction by the valve device, the oil flows out from the oil return port 210, enters the heat exchange oil pipe 320 through the first oil return pipe 440, and then enters the compressor 10 through the second oil return pipe 450 after heat exchange. When the oil is not cooled, the oil enters the compressor 10 through the bypass oil pipe 430 after flowing out from the oil return port 210. The oil temperature detection device 510 and the third oil return capillary tube 463 are arranged on the first oil return pipe 440 to detect the temperature of the oil and throttle the oil to reduce the pressure, thereby reducing the use of the oil temperature detection device 510 and the capillary tube and saving the cost of the air conditioner 100.

[0083] Further, in some embodiments of the utility model, the valve device includes two valves, one valve is arranged on the bypass oil pipe 430, and the first valve is arranged at the inlet of the heat exchange oil pipe 320. Alternatively, the valve device includes a three-way valve, and the three-way valve is arranged at the connection between the first oil return pipe 440 and the bypass oil pipe 430 to adjust the flow direction of the oil.

[0084] In some embodiments of the utility model, as shown in Figure 1 The air conditioner 100 further includes a four-way valve 70, a second heat exchanger 620 and a second throttling device 640, and the refrigerant outlet of the oil separator 20 is communicated with the first heat exchanger 610 through the four-way valve 70. The inlet of the second heat exchanger 620 is communicated with the outlet of the first throttling device 630, and the outlet of the second heat exchanger 620 is communicated with the suction port 110 through the four-way valve 70. The second throttling device 640 is arranged between the first heat exchanger 610 and the first throttling device 630.

[0085] In the embodiment, the air conditioner 100 further comprises a four-way valve 70, a second heat exchanger 620 and a second throttling device 640. When the air conditioner 100 is heating, the four-way valve 70 connects the refrigerant outlet of the compressor 10 and the inlet of the first heat exchanger 610, and the four-way valve 70 connects the outlet of the second heat exchanger 620 and the suction port 110. The refrigerant in a high-temperature and high-pressure gaseous state flows out of the compressor 10, is separated by the oil separator 20, enters the first heat exchanger 610 to exchange heat with the air flow, and the refrigerant after heat exchange becomes a normal-temperature and low-pressure liquid, and the temperature of the air flow is increased, which is blown into the indoor to increase the indoor temperature. The normal-temperature and high-pressure liquid refrigerant is decompressed by the second throttling device 640 to become low-temperature and low-pressure steam, and enters the second heat exchanger 620. After evaporating and gasifying and absorbing heat in the second heat exchanger 620, the refrigerant becomes low-temperature and low-pressure gas, and enters the compressor 10 through the suction port 110 to start the next cycle. When the air conditioner 100 is cooling, the four-way valve 70 connects the refrigerant outlet of the compressor 10 and the inlet of the second heat exchanger 620, and the four-way valve 70 connects the outlet of the first heat exchanger 610 and the suction port 110. The refrigerant in a high-temperature and high-pressure gaseous state flows out of the compressor 10, is separated by the oil separator 20, enters the second heat exchanger 620 to exchange heat with the air flow, and the refrigerant after heat exchange becomes a normal-temperature and high-pressure liquid. The normal-temperature and low-pressure liquid refrigerant is decompressed by the first throttling device 630 to become low-temperature and low-pressure steam, and enters the first heat exchanger 610. In the first heat exchanger 610, the refrigerant exchanges heat with the air flow, evaporates and gasifies, absorbs heat, becomes a normal-temperature and low-pressure gas, and the temperature of the air flow is decreased, which is blown into the indoor to decrease the indoor temperature. Then the refrigerant enters the compressor 10 through the suction port 110 to start the next cycle.

[0086] In some embodiments of the utility model, as shown in Figure 1 The air conditioner 100 further comprises a gas-liquid separator 80, an ejector cooling branch 910 and an ejector valve 920, and the four-way valve 70 is connected with the suction port 110 through the gas-liquid separator 80. One end of the ejector cooling branch 910 is connected with the gas-liquid separator 80, and the other end is connected between the second throttling device 640 and the first throttling device 630. The ejector valve 920 is arranged on the ejector cooling branch 910.

[0087] In the embodiment, the air conditioner 100 further comprises a gas-liquid separator 80, an ejector cooling branch 910 and an ejector valve 920. After the refrigerant flows out from the four-way valve 70, the refrigerant is separated by the gas-liquid separator 80, and then the gaseous refrigerant enters the compressor 10 again through the suction port 110 to start the next cycle. The outlet of the ejector cooling branch 910 is connected to the inlet of the gas-liquid separator 80, and the inlet of the ejector cooling branch 910 is between the second throttling device 640 and the first throttling device 630. When the outlet refrigerant temperature of the compressor 10 is high, the ejector valve 920 is opened to make the ejector cooling branch 910 conductive, and the refrigerant between the first throttling device 630 and the second throttling device 640 is in a low-temperature and low-pressure vapor state. After the refrigerant enters the gas-liquid separator 80 and is separated, the refrigerant enters the compressor 10 through the suction port 110. The low-temperature and low-pressure refrigerant reduces the temperature of the refrigerant in the compressor 10, avoids the problem that the oil separated in the oil separator 20 directly enters the compressor 10 to cause the exhaust temperature of the compressor 10 to be too high, and further ensures the normal and stable operation of the compressor 10.

[0088] In some embodiments of the utility model, the air conditioner 100 further comprises an ejector valve state detection device, an exhaust temperature detection device 550 and an exhaust pressure detection device 560. The ejector valve state detection device is configured to detect the opening information of the ejector valve 920 to control the oil return system according to the opening information of the ejector valve 920.

[0089] In the embodiment, the air conditioner 100 further comprises an ejector valve state detection device. When the ejector valve 920 detects that the ejector valve 920 is opened, the oil return system is controlled to make the oil flowing out of the oil separator 20 directly enter the compressor 10 through the suction port 110 without passing through the oil return cooling device 30, reduce the temperature of the refrigerant in the compressor 10 through the ejector cooling branch 910, prevent the problem that the exhaust temperature of the compressor 10 is too high, and further ensure the normal and stable operation of the compressor 10.

[0090] In some embodiments of the utility model, as shown in Figure 1 The air conditioner 100 further comprises an exhaust temperature detection device 550. The exhaust temperature detection device 550 is arranged on the exhaust pipeline of the compressor 10 to control the oil return system according to the detected temperature.

[0091] In the embodiment, the air conditioner 100 further comprises an exhaust temperature detection device 550, when the exhaust refrigerant temperature of the compressor 10 detected by the exhaust temperature detection device 550 exceeds a second preset temperature, the oil return system controls the oil flowing out of the oil separator 20 to pass through the oil return cooling device 30 to cool down and then enter the compressor 10 through the suction port 110, thereby reducing the temperature of the refrigerant in the compressor 10, preventing the problem of too high exhaust temperature of the compressor 10, and further ensuring the normal and stable operation of the compressor 10. The exhaust refrigerant temperature of the compressor 10 is more intuitive, the oil return system is controlled through the exhaust refrigerant temperature of the compressor 10, the oil return system is more accurately controlled, the heat exchange efficiency of the oil and the refrigerant is improved, and the working efficiency of the air conditioner 100 is further improved.

[0092] In some embodiments of the present application, as shown in Figure 1 The air conditioner 100 further comprises an exhaust pressure detection device 560, which is arranged on the exhaust pipeline of the compressor 10 to control the oil return system according to the detected pressure.

[0093] In the embodiment, the air conditioner 100 further comprises an exhaust pressure detection device 560, when the exhaust refrigerant pressure of the compressor 10 detected by the exhaust temperature detection device 550 exceeds a second preset temperature, the oil return system controls the oil flowing out of the oil separator 20 to pass through the oil return cooling device 30 to cool down and then enter the compressor 10 through the suction port 110, thereby reducing the temperature of the refrigerant in the compressor 10, preventing the problem of too high exhaust temperature of the compressor 10, and further ensuring the normal and stable operation of the compressor 10. The exhaust refrigerant pressure of the compressor 10 is more intuitive, the oil return system is controlled through the exhaust refrigerant temperature of the compressor 10, the oil return system is more accurately controlled, the heat exchange efficiency of the oil and the refrigerant is improved, and the working efficiency of the air conditioner 100 is further improved.

[0094] At this point, those skilled in the art should recognize that although the present application has been shown and described in detail in the above embodiments, many other variations or modifications can be directly determined or deduced according to the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variations or modifications.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises: a compressor having a suction port, the compressor being configured to compress refrigerant; an oil separator having an oil return port; an oil return cooling device configured to cool oil flowing out of the oil return port using refrigerant; an oil return system in communication with the oil return port and the suction port, and configured to allow oil flowing out of the oil separator to enter the suction port either after being cooled by the oil return cooling device or without passing through the oil return cooling device; an oil temperature detection device provided on the oil return system and configured to detect the temperature of oil flowing out of the oil separator, so as to control the oil return system based on at least the temperature detected by the oil temperature detection device.

2. The air conditioner of claim 1, wherein Further comprising: a first heat exchanger in communication with a refrigerant outlet of the oil separator; a first throttling device, an inlet of the first throttling device being in communication with an outlet of the first heat exchanger; the oil return cooling device is provided between the first heat exchanger and the first throttling device, and is configured to cool oil flowing out of the oil return port using refrigerant flowing out of the first heat exchanger, so as to increase the temperature of refrigerant entering the first throttling device.

3. The air conditioner of claim 2, wherein The oil return cooling device comprises: a refrigerant pipeline configured to flow refrigerant, an inlet of the refrigerant pipeline being in communication with an outlet of the first heat exchanger, and an outlet of the refrigerant pipeline being in communication with an inlet of the first throttling device; a heat exchange oil pipeline connected to the oil return system; the heat exchange oil pipeline is configured to be in thermal connection with the refrigerant pipeline; the oil temperature detection device is provided adjacent to an inlet of the heat exchange oil pipeline.

4. The air conditioner of claim 3, wherein Further comprising: a first refrigerant temperature detection device provided at the inlet of the refrigerant pipeline, so as to control the oil return system based on at least the temperatures detected by the oil temperature detection device and the first refrigerant temperature detection device.

5. The air conditioner of claim 4, wherein Further comprising: a second refrigerant temperature detection device provided at the outlet of the refrigerant pipeline, so as to control the oil return system based on at least the temperatures detected by the oil temperature detection device, the first refrigerant temperature detection device and the second refrigerant temperature detection device.

6. The air conditioner of claim 3, wherein The oil return system comprises: a first oil return branch, one end of the first oil return branch being connected to the oil return port, and the other end being connected to the suction port; a first valve provided on the first oil return branch; a second oil return branch, the second oil return branch comprising a first pipe segment and a second pipe segment; one end of the first pipe segment being connected to the oil return port, and the other end being connected to an inlet of the heat exchange oil pipeline; one end of the second pipe segment being connected to an outlet of the heat exchange oil pipeline, and the other end being connected to the suction port; a second valve provided on the first pipe segment.

7. The air conditioner according to claim 6, wherein: a first oil return capillary tube is provided on the first oil return branch, the first oil return capillary tube being on a downstream side of the first valve; a second oil return capillary tube is provided on the first pipe segment of the second oil return branch, the second oil return capillary tube being on a downstream side of the second valve; the oil temperature detection device is provided on the first pipe segment and on an upstream side of the second valve; or The oil temperature detection device is arranged on the first oil return branch and is located on the upstream side of the first valve. The oil temperature detection device is arranged on the first oil return branch and is located on the upstream side of the first valve.

8. The air conditioner of claim 3, wherein The oil return system comprises: a bypass oil pipe; a first oil return main pipe, one end of which is connected to the oil return port, and the other end of which is connected to the inlet of the heat exchange oil pipe and the inlet of the bypass oil pipe; a third oil return capillary pipe arranged on the first oil return main pipe; and a second oil return main pipe, one end of which is connected to the suction port, and the other end of which is connected to the outlet of the heat exchange oil pipe and the outlet of the bypass oil pipe; a valve device configured to selectively connect the bypass oil pipe and the heat exchange oil pipe.

9. The air conditioner of claim 3, wherein Further comprising: a four-way valve through which the first heat exchanger and the refrigerant outlet of the oil separator are communicated; a second heat exchanger, the inlet of which is communicated with the outlet of the first throttling device, and the outlet of which is communicated with the suction port through the four-way valve; a second throttling device arranged between the first heat exchanger and the first throttling device.

10. The air conditioner of claim 9, wherein Further comprising: a gas-liquid separator through which the four-way valve is communicated with the suction port; a jet cooling branch, one end of which is communicated with the gas-liquid separator, and the other end of which is connected between the second throttling device and the first throttling device; a jet valve arranged on the jet cooling branch; a jet valve state detection device configured to detect the opening information of the jet valve, so as to control the oil return system according to the opening information of the jet valve; an exhaust temperature detection device arranged on the exhaust pipeline of the compressor, so as to control the oil return system according to the detected temperature; an exhaust pressure detection device arranged on the exhaust pipeline of the compressor, so as to control the oil return system according to the detected pressure.

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