Heat storage oil separator and air conditioning system

Abstract

The utility model provides a heat storage oil separator and an air-conditioning system, which comprises a tank body, a heat storage oil separator, a heat storage oil separator, a heat storage oil separator and a heat storage oil separator, and the tank body is internally provided with a separation cavity, an oil separation inlet pipe and oil separation outlet pipes; the oil separation inlet pipe and the oil separation outlet pipe are both communicated with the separation cavity; a separation structure for separating oil is arranged in the separation cavity; the heat storage structure is arranged outside the separation cavity, and the heat storage structure is connected with the tank body; a heat storage medium for exchanging heat with the tank body is arranged in the heat storage structure; the heat storage pipeline comprises a heat storage inlet pipe used for introducing a heat storage medium into the heat storage structure and a heat storage outlet pipe used for enabling the heat storage medium in the heat storage structure to flow out. The heat storage oil separator solves the technical problem that a compressor in an air conditioning system in the prior art lacks oil.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a thermal storage oil separator and an air conditioning system. Background Art

[0002] In a multi-split system, the oil circuit design of the system is essential. When designing the oil circuit of the existing air-conditioning system, the oil in the oil separator will return to the steam separator through the pipeline and then enter the compressor, or directly return to the compressor.

[0003] However, when heating in winter, especially in the north, the temperature usually drops to minus 20 to 30 degrees Celsius. At this time, the lubricating oil cannot return to the compressor in time because of the low temperature, high viscosity and high circulation resistance. The low temperature will also cause the exhaust superheat of the oil to be low, and the oil discharge rate of the compressor will increase, resulting in oil shortage in the compressor. Although the situation is less severe during low-temperature cooling, it is also possible to face the situation of compressor wear due to untimely oil return.

[0004] In addition, the unit is prone to frequent start and stop in winter, but the unit load rate is generally low. During this process, the compressor will produce a large amount of high-temperature refrigerant gas, resulting in heat waste.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the utility model is to overcome the above technical deficiencies and provide a thermal storage oil separator and an air conditioning system to solve the technical problem of oil shortage in the compressor of the air conditioning system in the related art.

[0007] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: a heat storage oil separator is provided, comprising: a tank body, the tank body having a separation chamber, an oil separation inlet pipe and an oil separation outlet pipe; the oil separation inlet pipe and the oil separation outlet pipe are both connected to the separation chamber; a separation structure for separating oil is arranged in the separation chamber; a heat storage structure is arranged outside the separation chamber, and the heat storage structure is connected to the tank body; a heat storage medium for exchanging heat with the tank body is arranged in the heat storage structure; a heat storage pipeline, the heat storage pipeline comprising a heat storage inlet pipe for introducing the heat storage medium into the heat storage structure and a heat storage outlet pipe for allowing the heat storage medium in the heat storage structure to flow out.

[0008] Furthermore, the heat storage structure is arranged around the tank body, and a heat exchange cavity for accommodating the tank body is arranged in the heat storage structure, and the inner wall of the heat exchange cavity is attached to the tank body.

[0009] Furthermore, the heat storage oil separator also includes: a diverter, which is connected to the heat storage inlet pipe; a diverter branch pipe, one end of which is connected to the diverter, and the other end of which is connected to the heat storage structure, and there are multiple diverter branches, which are arranged at intervals.

[0010] Furthermore, a plurality of heat exchange pipelines for circulating heat exchange medium are arranged in the heat storage structure, and the plurality of heat exchange pipelines are connected to the plurality of branch pipes in a one-to-one correspondence. The heat storage oil separator also includes: a collector, which is connected to the heat storage outlet pipe; a collecting branch pipe, one end of which is connected to the collector, and the other end of which is connected to the heat exchange pipeline. There are a plurality of collecting branches, and the plurality of collecting branches are arranged at intervals.

[0011] The air conditioning system of this embodiment includes the above-mentioned thermal storage oil separator, and the air conditioning system includes: a compressor, the steam outlet of the compressor is connected to the heat storage inlet pipe of the thermal storage oil separator; the steam inlet of the compressor is connected to the heat storage outlet pipe of the thermal storage oil separator.

[0012] Furthermore, the air conditioning system also includes: a first heat storage expansion valve, which is arranged on the heat storage inlet pipe to control the opening of the heat storage inlet pipe; and a second heat storage expansion valve, which is arranged on the heat storage outlet pipe to control the opening of the heat storage outlet pipe.

[0013] Furthermore, the air conditioning system also includes a gas-liquid separator, and the heat storage outlet pipe is connected to the gas-liquid separator.

[0014] Furthermore, the oil outlet pipe includes: an oil outlet pipe for circulating oil, one end of the oil outlet pipe is connected to the tank body, and the other end of the oil outlet pipe is connected to the gas-liquid separator; and a gas outlet pipe for circulating gas.

[0015] Furthermore, the air conditioning system also includes: a four-way valve; an air pipe; a liquid pipe; a heat exchanger and a liquid pipe expansion valve for controlling the opening of the liquid pipe are arranged on the liquid pipe; and the air outlet pipe can be selectively connected to the air pipe and the liquid pipe through the four-way valve.

[0016] Furthermore, the air-conditioning system also includes: a return pipe, one end of which is connected to the four-way valve, the other end of which is connected to the gas-liquid separator, a low-pressure pipe is provided on the return pipe, and a low-pressure measuring valve is provided on the low-pressure pipe; and / or an environmental temperature sensing package is provided on the gas-liquid separator.

[0017] Beneficial effects:

[0018] 1. When the ambient temperature is too low, resulting in too low oil temperature, and the exhaust superheat is relatively large, the thermal storage electronic expansion valve is opened to allow part of the high-temperature refrigerant vapor to heat the thermal storage oil separator to increase the oil temperature. At the same time, the high-temperature gas is allowed to return to the compressor through the steam separator to accelerate the establishment of exhaust superheat.

[0019] 2. When the system detects that the compressor exhaust temperature is too high, the high pressure is too high or the low pressure is too low, it can also open the thermal storage electronic expansion valve to divert the gas discharged from the compressor to the steam part, thereby reducing the exhaust temperature, lowering the high pressure or raising the low pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the thermal storage oil separator used in the embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the air conditioning system adopted in the embodiment of the utility model.

[0022] The above drawings include the following reference numerals:

[0023] 1. Tank body; 11. Oil distribution inlet pipe; 12. Oil distribution outlet pipe; 121. Oil outlet pipe; 122. Air outlet pipe; 21. Heat storage inlet pipe; 211. First heat storage expansion valve; 221. Second heat storage expansion valve; 22. Heat storage outlet pipe; 3. Diverter; 31. Diverter branch pipe; 4. Collector; 41. Collector branch pipe; 5. Heat storage structure; 6. Compressor; 7. First heat storage expansion valve; 8. Gas-liquid separator; 91. Four-way valve; 92. Air pipe; 93. Liquid pipe; 94. Heat exchanger; 95. Liquid pipe expansion valve; 96. Return pipe; 97. Low-pressure pipe; 971. Low-pressure measuring valve; 98. Ambient temperature sensing package. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] See also Figure 1 to Figure 2 According to an embodiment of the utility model, a heat storage oil separator is provided, comprising: a tank body 1, wherein the tank body 1 has a separation chamber, an oil separation inlet pipe 11 and an oil separation outlet pipe 12; the oil separation inlet pipe 11 and the oil separation outlet pipe 12 are both connected to the separation chamber; a separation structure for separating oil is arranged in the separation chamber; a heat storage structure 5 is arranged outside the separation chamber, and the heat storage structure 5 is connected to the tank body 1; a heat storage medium for exchanging heat with the tank body 1 is arranged in the heat storage structure 5; a heat storage pipeline, wherein the heat storage pipeline comprises a heat storage inlet pipe 21 for introducing the heat storage medium into the heat storage structure 5 and a heat storage outlet pipe 22 for allowing the heat storage medium in the heat storage structure 5 to flow out.

[0026] Specifically, in a low-temperature environment, the temperature of the oil will also decrease, which will cause the oil to become more viscous, leaving a large amount of oil in the pipeline and unable to return to the compressor. In addition, the exhaust superheat will be relatively low during low-temperature startup, resulting in an increase in the compressor oil discharge rate, more oil discharged, and aggravated compressor oil shortage. In addition, the unit will start and stop frequently in winter, and the internal machine load rate is low, so the compressor will produce a large amount of high-temperature refrigerant gas that cannot be used in time.

[0027] By adopting the above arrangement, the unit can be controlled to enter a part of the high-temperature and high-pressure gas discharged from the compressor into the thermal oil separator when the exhaust temperature is high under low-temperature conditions, and use its heat to heat the oil in the thermal oil separator to improve the lubricity of the oil. Since this part of the gas does not pass through the thermal oil separator, it will carry a part of the oil, so this part of the gas is introduced into the steam separator for separation. At the same time, the high-temperature gas under low-temperature conditions enters the steam separator and then returns to the compressor 6, which is also conducive to the establishment of exhaust superheat, thereby solving the technical problem of compressor oil shortage in the air-conditioning system.

[0028] In the thermal oil separator of this embodiment, see Figure 1 The heat storage structure 5 is arranged around the tank body 1, and a heat exchange cavity for accommodating the tank body 1 is arranged in the heat storage structure 5, and the inner wall of the heat exchange cavity is attached to the tank body 1. In this way, the contact area between the heat storage structure 5 and the tank body 1 can be increased, thereby improving the heat exchange efficiency.

[0029] See also Figure 1 In the thermal storage oil separator of this embodiment, the thermal storage oil separator further includes: a flow divider 3, which is connected to the thermal storage inlet pipe 21; a flow branch pipe 31, one end of which is connected to the flow divider 3, and the other end of which is connected to the thermal storage structure 5, and there are multiple flow branch pipes 31, which are arranged at intervals. In this way, the oil can be dispersed to various positions of the thermal storage structure 5, thereby improving the heat exchange efficiency of the oil.

[0030] See also Figure 1 In the thermal storage oil separator of this embodiment, a plurality of heat exchange pipelines for heat exchange medium circulation are arranged in the thermal storage structure 5, and the plurality of heat exchange pipelines are connected to the plurality of branch pipes 31 in a one-to-one correspondence. The thermal storage oil separator also includes: a collector 4, which is connected to the thermal storage outlet pipe 22; a collecting branch pipe 41, one end of which is connected to the collector 4, and the other end of which is connected to the heat exchange pipeline. There are a plurality of collecting branch pipes 41, and the plurality of collecting branch pipes 41 are arranged at intervals. In this way, the oil can be dispersed to various positions of the thermal storage structure 5, thereby improving the heat exchange efficiency of the oil.

[0031] See also Figure 1 , Figure 2 The air conditioning system of this embodiment includes the above-mentioned thermal storage oil separator, and the air conditioning system includes: a compressor 6, the steam outlet of the compressor 6 is connected to the heat storage inlet pipe 21 of the thermal storage oil separator; the steam inlet of the compressor 6 is connected to the heat storage outlet pipe 22 of the thermal storage oil separator.

[0032] By adopting the above arrangement, the heat is used to heat the oil in the thermal oil separator to improve the lubricity of the oil. Since this part of the gas does not pass through the thermal oil separator, it will carry a part of the oil, so this part of the gas is introduced into the steam separator for separation. At the same time, the high-temperature gas under low-temperature conditions enters the steam separator and then returns to the compressor 6, which is also conducive to the establishment of exhaust superheat.

[0033] In the air conditioning system of this embodiment, see Figure 2 The air conditioning system further includes: a first heat storage expansion valve 211, which is arranged on the heat storage inlet pipe 21 to control the opening of the heat storage inlet pipe 21; a second heat storage expansion valve 221, which is arranged on the heat storage outlet pipe 22 to control the opening of the heat storage outlet pipe 22. In this way, the unit can be controlled to open the heat storage electronic expansion valve when the unit is in a low temperature condition and the exhaust temperature is high, so that a part of the high temperature and high pressure gas discharged by the compressor enters the heat storage oil separator, thereby better adjusting the working mode of the air conditioning system.

[0034] See also Figure 2 In the air conditioning system of this embodiment, the air conditioning system further comprises a gas-liquid separator 8, and the heat storage outlet pipe 22 is connected to the gas-liquid separator 8. In this way, the filtered oil is passed into the compressor 6, thereby replenishing the oil for the compressor 6.

[0035] In the air conditioning system of this embodiment, see Figure 2 The oil outlet pipe 12 includes: an oil outlet pipe 121 for circulating oil, one end of which is connected to the tank 1, and the other end of which is connected to the gas-liquid separator 8; and a gas outlet pipe 122 for circulating gas. In this way, the separated oil is returned to the compressor 6, and the separated gas is used for work.

[0036] See also Figure 2 In the air conditioning system of this embodiment, the air conditioning system further includes: a four-way valve 91; an air pipe 92; a liquid pipe 93; a heat exchanger 94 and a liquid pipe expansion valve 95 for controlling the opening of the liquid pipe 93 are arranged on the liquid pipe 93; and the air outlet pipe 122 can be selectively connected to the air pipe 92 and the liquid pipe 93 through the four-way valve 91. In this way, it is convenient for the air conditioning system to switch the working mode and simplifies the structure of the pipeline.

[0037] In the air conditioning system of this embodiment, see Figure 2 The air conditioning system further includes: a return pipe 96, one end of which is connected to the four-way valve 91, and the other end of which is connected to the gas-liquid separator 8, a low-pressure pipe 97 is provided on the return pipe 96, and a low-pressure measuring valve 971 is provided on the low-pressure pipe 97; and / or an environmental temperature sensing package 98 is provided on the gas-liquid separator 8. In this way, the fluid after heat exchange passes through the return pipe 96 to reach the gas-liquid separator 8, thereby circulating and doing work.

[0038] Specifically, during heating operation, the high-temperature and high-pressure gas discharged from the compressor 6 passes through the condenser (indoor side) and is condensed into high-pressure liquid, and is adiabatically throttled through the throttling device and enters the evaporator (outdoor side). It then evaporates into low-pressure gaseous refrigerant in the evaporator and enters the gas-liquid separator 8. The separated gas continues to enter the compressor 6 for adiabatic compression and becomes high-pressure gas to continue circulating. The system detects the exhaust temperature and the temperature of the ambient temperature sensing package 98, opens the thermal storage electronic expansion valve, allows part of the high-temperature gas to pass through the thermal storage oil separator, heats the oil, and returns to the vapor fraction, thereby utilizing the heat.

[0039] Specifically, in the air conditioning system of this embodiment, during refrigeration operation, after the high-temperature and high-pressure gas discharged by the compressor 6 passes through the thermal storage oil separator, the oil will return to the gas-liquid separator 8 through the oil circuit, and the refrigerant gas will enter the condenser (outdoor side) to condense into a high-pressure liquid, and enter the evaporator through adiabatic throttling of the throttling device. Subsequently, it evaporates into a low-pressure gaseous refrigerant in the evaporator and enters the gas-liquid separator 8. The separated gas continues to enter the compressor 6 for adiabatic compression and becomes a high-pressure gas to continue circulating. When the feedback temperature of the ambient temperature sensing package 98 is too low, the thermal storage electronic expansion valve is opened to allow part of the high-temperature gas to pass through the thermal storage oil separator to heat the oil and return to the vapor fraction, thereby utilizing the heat.

[0040] In addition, when the exhaust temperature is too high, the high pressure is too high or the low pressure is too low, the thermal storage electronic expansion valve can also be opened to divert the high-temperature refrigerant gas to the steam separator, acting as a bypass to protect the normal operation of the system.

[0041] Specifically, in the air conditioning system of this embodiment, it is mainly controlled by the temperature of the ambient temperature sensing package 98 arranged on the thermal oil separator and the exhaust temperature of the compressor. Generally, Tx1 is set to 20° C., Tx2 is set to 40° C., and Tc is set to 50° C. The values ​​can be set by the on-site commissioning personnel according to the actual environment.

[0042] During heating operation, when the temperature of the ambient temperature sensing package 98 is less than Tx1, the exhaust temperature is detected;

[0043] When the exhaust temperature is ≥Tc, the opening of the thermal storage electronic expansion valve is 300PLS;

[0044] When the exhaust temperature is less than Tc, close the thermal storage electronic expansion valve;

[0045] When the temperature of the ambient temperature sensing package 98 is ≥Tx1 and <Tx2, the last control is maintained, and the thermal storage electronic expansion valve is closed when entering for the first time;

[0046] When the temperature of the ambient temperature sensing package 98 is ≥Tx2, the thermal storage electronic expansion valve is closed.

[0047] During refrigeration operation, when the startup time is less than 30 minutes;

[0048] When the temperature of the ambient temperature sensing package 98 is less than Tx1, the exhaust temperature is detected;

[0049] When the exhaust temperature is ≥Tc, the opening of the thermal storage electronic expansion valve is 300PLS;

[0050] When the exhaust temperature is less than Tc, close the thermal storage electronic expansion valve;

[0051] When the temperature of the ambient temperature sensing package 98 is ≥Tx1 and the temperature of the ambient temperature sensing package 98 is <Tx2, the last control is maintained, and the thermal storage electronic expansion valve is closed when entering for the first time;

[0052] When the temperature of the ambient temperature sensing package 98 is ≥Tx2, the thermal storage electronic expansion valve is closed.

[0053] When the startup time is ≥30min, close the thermal storage electronic expansion valve.

[0054] When the system reports that the exhaust temperature of compressor 6 is higher than the set protection value of -3°C, the high pressure is higher than the set protection value of -0.2MPa, or the low pressure is lower than the set protection value of +0.2MPa, the thermal storage electronic expansion valve opens 300PLS until normal parameters are restored, and then the thermal storage electronic expansion valve is closed.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0057] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0058] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0059] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A thermal storage oil separator, characterized in that: include: A tank body (1), wherein the tank body (1) has a separation chamber, an oil separation inlet pipe (11) and an oil separation outlet pipe (12); the oil separation inlet pipe (11) and the oil separation outlet pipe (12) are both connected to the separation chamber; and a separation structure for separating oil is provided in the separation chamber; A heat storage structure (5) is arranged outside the separation chamber, and the heat storage structure (5) is connected to the tank body (1); a heat storage medium for exchanging heat with the tank body (1) is arranged in the heat storage structure (5); A heat storage pipeline, the heat storage pipeline comprising a heat storage inlet pipe (21) for introducing the heat storage medium into the heat storage structure (5) and a heat storage outlet pipe (22) for allowing the heat storage medium in the heat storage structure (5) to flow out.

2. The thermal storage oil separator according to claim 1, characterized in that: The heat storage structure (5) is arranged around the tank body (1), and a heat exchange cavity for accommodating the tank body (1) is arranged inside the heat storage structure (5), and the inner wall of the heat exchange cavity is attached to the tank body (1).

3. The thermal storage oil separator according to claim 1, characterized in that: The thermal storage oil separator also includes: A flow divider (3), the flow divider (3) being connected to the heat storage inlet pipe (21); A flow branch pipe (31), one end of the flow branch pipe (31) is connected to the flow diverter (3), and the other end of the flow branch pipe (31) is connected to the heat storage structure (5), and there are a plurality of flow branch pipes (31), and the plurality of flow branch pipes (31) are arranged at intervals.

4. The thermal storage oil separator according to claim 3, characterized in that: The heat storage structure (5) is provided with a plurality of heat exchange pipelines for circulating heat exchange medium, the plurality of heat exchange pipelines are connected to the plurality of branch pipes (31) in a one-to-one correspondence, and the heat storage oil separator further comprises: A current collector (4), the current collector (4) being connected to the heat storage outlet pipe (22); A collecting branch pipe (41), one end of the collecting branch pipe (41) is connected to the collector (4), and the other end of the collecting branch pipe (41) is connected to the heat exchange pipeline. There are a plurality of collecting branch pipes (41), and the plurality of collecting branch pipes (41) are arranged at intervals.

5. An air conditioning system, comprising the thermal storage oil separator according to any one of claims 1 to 4, characterized in that: The air conditioning system comprises: A compressor (6), wherein a steam outlet of the compressor (6) is in communication with a heat storage inlet pipe (21) of the heat storage oil separator; and a steam inlet of the compressor (6) is in communication with a heat storage outlet pipe (22) of the heat storage oil separator.

6. The air conditioning system according to claim 5, characterized in that: The air conditioning system further comprises: A first heat storage expansion valve (211) is arranged on the heat storage inlet pipe (21) to control the opening degree of the heat storage inlet pipe (21); The second heat storage expansion valve (221) is arranged on the heat storage outlet pipe (22) to control the opening degree of the heat storage outlet pipe (22).

7. The air conditioning system according to claim 5, characterized in that: The air conditioning system further comprises a gas-liquid separator (8), and the heat storage outlet pipe (22) is connected to the gas-liquid separator (8).

8. The air conditioning system according to claim 7, characterized in that: The oil outlet pipe (12) comprises: an oil outlet pipe (121) for circulating oil, one end of the oil outlet pipe (121) being connected to the tank body (1), and the other end of the oil outlet pipe (121) being connected to the gas-liquid separator (8); An outlet pipe (122) for circulating gas.

9. The air conditioning system according to claim 8, characterized in that: The air conditioning system further comprises: Four-way valve (91); trachea (92); A liquid pipe (93); the liquid pipe (93) is provided with a heat exchanger (94) and a liquid pipe expansion valve (95) for controlling the opening of the liquid pipe (93); The air outlet pipe (122) is selectively connected to the air pipe (92) and the liquid pipe (93) via the four-way valve (91).

10. The air conditioning system according to claim 9, characterized in that: The air conditioning system further comprises: a return pipe (96), one end of the return pipe (96) being connected to the four-way valve (91), the other end of the return pipe (96) being connected to the gas-liquid separator (8), the return pipe (96) being provided with a low-pressure pipe (97), the low-pressure pipe (97) being provided with a low-pressure measuring valve (971); and / or, The environmental temperature sensing package (98) is arranged on the gas-liquid separator (8).

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