Oil separator and multi-connected air conditioning unit

Abstract

The utility model provides an oil separator and a multi-connected air conditioning unit, relates to the technical field of refrigerating systems, and aims to solve the problem that a one-way valve of an existing multi-connected air conditioning unit is communicated with an air outlet pipe of the oil separator through a pipeline, and a filter is communicated with an oil return pipe of the oil separator through the pipeline, so that the pipeline is long. The oil separator comprises an oil separator body, a one-way valve and a filter, the oil separator body is provided with an air outlet, an air inlet and an oil return opening, the air outlet is communicated with an air outlet pipe, and the one-way valve is located in the air outlet pipe and used for enabling the oil separator body to be in one-way conduction in the direction of the air outlet pipe; the oil return opening communicates with an oil return pipe, the filter is located in the oil return pipe, and the filter and the oil return opening are spaced by a set distance. According to the utility model, the use quantity of pipelines is reduced, and the problem that the pipelines are longer in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to an oil separator and a multi-connected air conditioning unit. Background Art

[0002] At present, in a multi-split air-conditioning unit with multiple compressors connected in parallel, the one-way valve is connected to the air outlet pipe of the oil separator through a pipeline, and the filter is connected to the oil return pipe of the oil separator through a pipeline. This setting has the problem of long pipelines, and the setting of the one-way valve and the filter will affect the direction of the original pipeline, and the pipeline often needs to be redesigned, which greatly increases time and cost. Utility Model Content

[0003] The first purpose of the utility model is to provide an oil separator to solve the technical problem that the one-way valve of the existing multi-split air-conditioning unit is connected to the air outlet pipe of the oil separator through a pipeline, and the filter is connected to the oil return pipe of the oil separator through a pipeline, which makes the pipeline long.

[0004] The utility model provides an oil separator, comprising an oil separator body, a one-way valve and a filter, wherein the oil separator body is provided with an air outlet, an air inlet and an oil return port, wherein the air outlet is connected with an air outlet pipe, the one-way valve is located inside the air outlet pipe, and is used to make the oil separator body unidirectionally conductive in the direction of the air outlet pipe; the oil return port is connected with an oil return pipe, the filter is located inside the oil return pipe, and the filter is spaced a set distance from the oil return port.

[0005] The use of the oil separator in a multi-split air-conditioning unit is used as an example for explanation, wherein the oil separator is separately provided at the output end of each compressor. By providing an oil separator mainly composed of an oil separator body, a one-way valve and a filter, the output end of each compressor in the multi-split air-conditioning unit is connected to the air inlet of the oil separator, so that the mixture of refrigerant and oil discharged by the compressor enters the oil separator body from the air inlet, and separation is achieved by the oil separator body. The separated refrigerant can flow to the one-way valve through the air outlet, and further flow out through the air outlet pipe; the separated oil flows to the filter through the oil return port, and returns to the oil through the oil return pipe after the filtering effect is completed.

[0006] The oil separator realizes the integration of the one-way valve, the filter and the oil separator body by arranging the one-way valve inside the exhaust pipe and the filter inside the oil return pipe. There is no need to set up additional pipelines for the one-way valve and the filter to be connected to the oil separator body, which reduces the number of pipelines used. This not only improves the problem of long pipelines in the prior art, but also does not affect the direction of the original pipeline. There is no need to redesign the pipeline, the degree of commonality is high, and the external connection time and cost are reduced. Moreover, this setting does not decompose an entire pipeline into the form of "pipeline→one-way valve (filter)→pipeline", which reduces the number of welding points and the risk of welding blockage and welding leakage.

[0007] In addition, by setting a set distance between the filter and the oil return port, on the one hand, during the oil return process, the oil flowing out of the oil return port will first flow in the oil return pipe for a set distance, and then be filtered through the filter. That is to say, the oil will not hit the filter at the moment it flows out of the oil return port, but will first flow along the wall of the oil return pipe and be guided to the filter by the wall. The filter will not form a barrier to the oil at the moment of oil return, thereby making the oil return process smoother. On the other hand, when there is a bend in the oil return pipe at the connection with the oil return port, this setting also allows the installation position of the filter to leave a certain distance from the bend in the oil return pipe, thereby ensuring the installation stability of the filter and preventing the installation reliability of the filter from being reduced due to the bending of the oil return pipe.

[0008] Furthermore, the one-way valve includes a valve seat and a valve core, wherein the valve seat is fixedly connected to the air outlet pipe, and the valve seat is provided with a flow passage; the valve core is movably arranged on the valve seat, and the valve core has a cut-off position for blocking the flow passage, and a conduction position for opening the flow passage. This method of opening or blocking the flow passage by relative movement between the valve core and the valve seat can not only ensure the reliability of the one-way conduction of the oil separator body toward the air outlet pipe, but also has a simple structure and low cost.

[0009] Furthermore, the valve seat includes a cylinder and a mounting plate, the cylinder having a hollow cavity penetrating the cylinder along the flow direction of the refrigerant, the mounting plate being fixedly arranged in the hollow cavity, the mounting plate being provided with a flow hole communicating with the hollow cavity, the flow hole and the hollow cavity together forming the flow passage; the cavity wall of the hollow cavity forms a sealing surface for cooperating with the valve core. By setting the valve seat in the above-mentioned form, the valve seat has a certain extension length along the axial direction of the outlet pipe, so as to form an effective support for the outlet pipe, and prevent the outlet pipe from being deformed at the position of the one-way valve, which causes the valve core to be unable to cooperate with the valve seat, so that the one-way valve cannot be smoothly switched to the cut-off position. In addition, this setting makes the one-way valve a straight-through design, and the process is simple. And / or, in the conduction position, the distance between the valve core and the pipe mouth of the outlet pipe is greater than 4cm. This arrangement ensures that when the oil separator is connected to other pipelines, when other pipelines extend from the outlet pipe opening into the outlet pipe and are welded to the outlet pipe, they will not collide with the valve core, thus providing a certain degree of protection for the valve core.

[0010] Furthermore, the cylinder is provided with a mounting protrusion extending radially toward the hollow cavity, and the mounting plate is fixedly arranged on the mounting protrusion. This arrangement can realize the support and positioning of the mounting plate.

[0011] Furthermore, the one-way valve further includes an elastic element, which connects the valve core and the mounting plate, and is used to make the valve core always have a tendency to remain in the conduction position. This arrangement makes the valve core always have a tendency to remain in the conduction position, so as to ensure that the refrigerant separated by the oil separator body can be smoothly discharged through the outlet pipe. Moreover, the arrangement of the elastic element also realizes the connection between the valve core and the valve seat, preventing the valve core from detaching from the valve seat.

[0012] Furthermore, the valve core includes a connecting plate and a sphere, wherein the connecting plate is located between the elastic element and the sphere, and the valve core is connected to the elastic element via the connecting plate, wherein the outer diameter of the connecting plate is smaller than the inner diameter of the cylinder, and the valve core is sealed with the cavity wall of the hollow cavity via the sphere. The connecting plate is used as an intermediate transition component to achieve assembly connection between the sphere and the elastic element, which can improve the installation reliability of the sphere; in addition, by setting the outer diameter of the connecting plate to be smaller than the inner diameter of the cylinder, it can also prevent the friction between the connecting plate and the cylinder during the movement of the valve core.

[0013] Furthermore, the distance between the one-way valve and the air outlet is not less than 1 cm and not more than 2 cm. This arrangement can avoid the situation where the refrigerant collides with the one-way valve at the moment of air outlet and is blocked, resulting in an increase in the refrigerant flow resistance, due to the one-way valve being too close to the air outlet.

[0014] Furthermore, the filter includes a fixing seat and a filter screen, the fixing seat is fixedly connected to the oil return pipe, the filter screen is installed on the fixing seat, and the filter screen is used to filter the oil flowing out from the oil return port. The arrangement is simple in structure and low in cost. And / or, the set distance is not less than 2 cm and not more than 3 cm; and / or, the distance between the filter and the pipe mouth of the oil return pipe is greater than 4 cm. This arrangement ensures that when the oil separator is connected to other pipelines, when other pipelines extend from the pipe mouth of the oil return pipe into the oil return pipe and are welded to the oil return pipe, they will not collide with the filter screen, which provides a certain degree of protection for the filter screen.

[0015] Furthermore, the inner wall of the oil return pipe is provided with a plurality of limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the axial direction of the oil return pipe, and a slot is formed between any two adjacent limiting protrusions, and the fixing seat is clamped in the slot. This arrangement can realize reliable installation of the fixing seat, and has a simple structure. And / or, the filter screen is cup-shaped, the filter screen is fixedly connected to the fixing seat through the opening of the cup shape, and the filter screen is located on the side of the fixing seat away from the oil return port, wherein the cross section of the filter screen gradually decreases from the oil return port to the pipe mouth of the oil return pipe. This arrangement enables the oil flow rate to be increased by utilizing the change in the cross section of the filter screen during the movement of the oil from the oil return port to the pipe mouth of the oil return pipe, thereby ensuring the smoothness of the flow of the oil to the pipe mouth of the oil return pipe. And / or, the filter also includes a bracket, the bracket is fixedly connected to the fixing seat, and the bracket supports the filter screen. This arrangement allows the filter to have a certain degree of rigidity, thereby preventing the filter from being unable to filter the oil due to a large degree of deformation of the filter.

[0016] Furthermore, the limiting protrusion is annular, and the clamping groove is an annular groove. This arrangement can fix the fixing seat at various positions of the fixing seat along its circumference, thereby improving the installation reliability of the fixing seat.

[0017] The second purpose of the utility model is to provide a multi-split air-conditioning unit to solve the technical problem that the one-way valve of the existing multi-split air-conditioning unit is connected to the air outlet pipe of the oil separator through a pipeline, and the filter is connected to the oil return pipe of the oil separator through a pipeline, which makes the pipeline long.

[0018] The multi-connected air-conditioning unit provided by the utility model comprises a plurality of compressors operating in parallel, and the output end of each compressor is provided with the above-mentioned oil separator, wherein the output end of the compressor is connected to the air inlet of the oil separator.

[0019] By arranging the above-mentioned oil separator in the multi-split air-conditioning unit, accordingly, the multi-split air-conditioning unit has all the advantages of the above-mentioned oil separator, which will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of an oil separator provided by the prior art;

[0022] Figure 2 A schematic diagram of the connection between an oil separator, a one-way valve and a filter provided in the prior art;

[0023] Figure 3 A schematic diagram of the structure of an oil separator provided in an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the internal structure of the air outlet pipe of the oil separator provided by the embodiment of the utility model when the one-way valve is in the conducting position;

[0025] Figure 5 A schematic diagram of the internal structure of the air outlet pipe of the oil separator provided in an embodiment of the utility model when the one-way valve is in the cut-off position;

[0026] Figure 6 A schematic diagram of the top view of the mounting plate of the oil separator provided in the embodiment of the utility model;

[0027] Figure 7 A schematic diagram of the internal structure of the oil return pipe of the oil separator provided in an embodiment of the utility model;

[0028] Figure 8 A schematic structural diagram of a filter of an oil separator provided in an embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 100'-oil separator; 110'-exhaust pipe; 120'-intake pipe; 130'-oil return pipe; 200'-check valve; 300'-filter;

[0031] 100-oil separator body; 200-check valve; 300-filter; 400-exhaust pipe; 500-return oil pipe; 510-limiting protrusion; 520-slot; 600-intake pipe;

[0032] 110-air outlet; 120-air inlet; 130-oil return port;

[0033] 210-valve seat; 211-cylinder; 2111-hollow cavity; 2112-mounting protrusion; 212-mounting plate; 2121-flow hole; 2122-connecting beam; 2123-base; 220-valve core; 221-connecting plate; 222-sphere; 230-flow channel; 240-elastic element;

[0034] 310-fixing seat; 320-filter; 330-bracket. DETAILED DESCRIPTION

[0035] Current air conditioning units are classified according to the number of compressors in the refrigeration system, including single-split air conditioning units with one compressor and multi-split air conditioning units with multiple compressors. In a multi-split air conditioning unit with multiple compressors in parallel, a one-way valve is usually installed on the pipeline to prevent the refrigerant from entering the compressor and damaging it due to pressure difference when some of them are turned on and some are turned off. In addition, the oil separated by the oil separator contains impurities when returning the oil, and a filter needs to be installed on the pipeline to filter it to prevent the oil with impurities from entering the compressor and causing compressor failure.

[0036] Figure 1 The structure diagram of the oil separator 100' provided by the prior art. Figure 1 As shown, the oil separator 100' comprises an air outlet pipe 110', an air inlet pipe 120' and an oil return pipe 130'. Figure 2 The schematic diagram of the oil separator 100' provided by the prior art is connected with the one-way valve 200' and the filter 300'. Figure 2 As shown, in the existing multi-connected air conditioning unit, the one-way valve 200' is connected to the outlet pipe 110' of the oil separator 100' through a pipeline, and the filter 300' is connected to the oil return pipe 130' of the oil separator 100' through a pipeline. This setting inevitably requires the setting of connecting pipelines at the positions of the outlet pipe 110' and the oil return pipe 130', thereby lengthening the pipeline. In addition, the setting of the one-way valve 200' and the filter 300' will affect the original pipeline direction. In order to ensure the reliable connection between the one-way valve 200' and the filter 300' and the corresponding pipeline of the oil separator 100', the pipeline often needs to be redesigned, and the degree of commonality is high, which greatly increases time and cost.

[0037] In addition, the provision of the one-way valve 200' and the filter 300' requires decomposing a complete pipeline into the form of "pipeline → one-way valve 200' (filter 300') → pipeline", which not only increases the number of welding points, but also increases the risk of welding blockage and welding leakage.

[0038] Therefore, the purpose of the utility model is to provide an oil separator and a multi-split air-conditioning unit to solve the technical problem that the one-way valve of the existing multi-split air-conditioning unit is connected to the air outlet pipe of the oil separator through a pipeline, and the filter is connected to the oil return pipe of the oil separator through a pipeline, which makes the pipeline long.

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0040] Figure 3 The schematic diagram of the structure of the oil separator provided in this embodiment. Figure 3 As shown, this embodiment provides an oil separator, including an oil separator body 100, a one-way valve 200 and a filter 300. The oil separator body 100 is provided with an air outlet 110, an air inlet 120 and an oil return port 130, wherein the air outlet 110 is connected to an air outlet pipe 400, and the one-way valve 200 is located inside the air outlet pipe 400, and is used to make the oil separator body 100 unidirectionally conductive in the direction of the air outlet pipe 400; the oil return port 130 is connected to an oil return pipe 500, and the filter 300 is located inside the oil return pipe 500, and the filter 300 is spaced apart from the oil return port 130 by a set distance.

[0041] The use of the oil separator in a multi-connected air-conditioning unit is used as an example for explanation, wherein the output end of each compressor is separately provided with the oil separator. By providing an oil separator mainly composed of an oil separator body 100, a one-way valve 200 and a filter 300, the output end of each compressor in the multi-connected air-conditioning unit is connected to the air inlet 120 of the oil separator, so that the mixture of the refrigerant and the oil discharged by the compressor enters the oil separator body 100 from the air inlet 120, and separation is achieved by using the oil separator body 100. The separated refrigerant can flow to the one-way valve 200 through the air outlet 110, and further flow out through the air outlet pipe 400; the separated oil flows to the filter 300 through the oil return port 130, and returns to the oil through the oil return pipe 500 after the filtering effect is completed.

[0042] The oil separator realizes the integration of the one-way valve 200, the filter 300 and the oil separator body 100 by arranging the one-way valve 200 inside the air outlet pipe 400 and the filter 300 inside the oil return pipe 500. There is no need to set up additional pipelines for the one-way valve 200 and the filter 300 to be connected to the oil separator body 100, thereby reducing the number of pipelines used. This not only improves the problem of long pipelines in the prior art, but also does not affect the direction of the original pipeline. There is no need to redesign the pipeline, which reduces the external connection time and cost. Moreover, this setting does not decompose an entire pipeline into the form of "pipeline→one-way valve (filter)→pipeline", which reduces the number of welding points and reduces the risks of welding blockage and welding leakage.

[0043] In addition, by setting the filter 300 and the oil return port 130 at a set distance, during the oil return process, the oil flowing out from the oil return port 130 will first flow in the oil return pipe 500 for a set distance, and then be filtered by the filter 300. In other words, the oil will not hit the filter 300 at the moment it flows out from the oil return port 130, but will first flow along the wall of the oil return pipe 500, and will be guided to the filter 300 by the guiding effect of the wall. The filter 300 will not form a barrier to the oil at the moment of oil return, thereby making the oil return process smoother.

[0044] Please continue to refer to Figure 3 In this embodiment, the distance can be set by Figure 3 a in , that is, the distance between the filter 300 and the oil return port 130 refers to the distance between the bottom of the filter 300 and the bottom of the oil return port 130. The set distance is not less than 2 cm and not more than 3 cm, that is, 2 cm ≤ a ≤ 3 cm.

[0045] Please continue to refer to Figure 3 In this embodiment, the oil return pipe 500 has a bent section at the portion connected to the oil return port 130 .

[0046] By setting a distance between the filter 300 and the oil return port 130, a certain distance is left between the installation position of the filter 300 and the curved section of the oil return pipe 500, thereby ensuring the installation stability of the filter 300 and preventing the installation reliability of the filter 300 from being reduced due to the bending of the oil return pipe 500.

[0047] It should be noted that, in this embodiment, the internal structure of the oil separator body 100 and the principle of separating the refrigerant and the oil can be obtained by those skilled in the art based on the prior art, and this embodiment does not make any improvements thereto, so they will not be described in detail.

[0048] Figure 4The schematic diagram of the internal structure of the air outlet pipe 400 of the oil separator provided in this embodiment when the one-way valve 200 is in the conducting position, Figure 5 The internal structure diagram of the outlet pipe 400 of the oil separator provided in this embodiment when the one-way valve 200 is in the cut-off position. Figure 4 and Figure 5 As shown, in this embodiment, the one-way valve 200 may include a valve seat 210 and a valve core 220. Specifically, the valve seat 210 is fixedly connected to the outlet pipe 400, and the valve seat 210 is provided with a flow channel 230; the valve core 220 is movably arranged on the valve seat 210, and the valve core 220 has a cut-off position for blocking the flow channel 230, and a conducting position for opening the flow channel 230.

[0049] When the multi-split air-conditioning unit is operating normally, the valve core 220 is in the conduction position, the flow channel 230 is opened, and the refrigerant separated by the oil separator body 100 can be discharged from the air outlet pipe 400 through the flow channel 230 to flow to the condenser; when one of the multiple parallel compressors of the multi-split air-conditioning unit is shut down, the refrigerant of the remaining compressors may flow to the shut-down compressor due to the pressure difference. At this time, the valve core 220 of the oil separator corresponding to the shut-down compressor will be pushed to the cut-off position, the flow channel 230 will be blocked, and the air outlet 110 will be closed, so that the refrigerant cannot enter the oil separator body 100 from the air outlet pipe 400, let alone flow to the compressor, thereby ensuring the safety of the multi-split air-conditioning unit and protecting the compressor.

[0050] This method of opening or blocking the flow passage 230 by relative movement between the valve core 220 and the valve seat 210 can not only ensure the reliability of the one-way conduction of the oil separator body 100 toward the air outlet pipe 400, but also has a simple structure and low cost.

[0051] Figure 6 This is a top view of the mounting plate 212 of the oil separator provided in this embodiment. Figure 4 and Figure 5 , and combined with Figure 6 In this embodiment, the valve seat 210 may include a cylinder 211 and a mounting plate 212. Specifically, the cylinder 211 has a hollow cavity 2111 that penetrates the cylinder 211 along the flow direction of the refrigerant. The mounting plate 212 is fixedly arranged in the hollow cavity 2111. The mounting plate 212 is provided with a flow hole 2121 that is connected to the hollow cavity 2111. The flow hole 2121 and the hollow cavity 2111 together form a flow channel 230; the cavity wall of the hollow cavity 2111 forms a sealing surface for cooperating with the valve core 220.

[0052] When the valve core 220 is in the cut-off position, the outer peripheral surface of the valve core 220 cooperates with the cavity wall of the hollow cavity 2111, so that the flow channel 230 is in a blocked state; when the valve core 220 is in the conduction position, the outer peripheral surface of the valve core 220 is not in contact with the cavity wall of the hollow cavity 2111. At this time, the flow channel 230 is in an open state, and the refrigerant can flow to the condenser through the surrounding of the valve core 220.

[0053] By setting the valve seat 210 in the above-mentioned form, the valve seat 210 has a certain extension length along the axial direction of the outlet pipe 400, so as to form an effective support for the outlet pipe 400, and prevent the outlet pipe 400 from deforming at the position of the one-way valve 200, which causes the valve core 220 to fail to cooperate with the valve seat 210 and causes the one-way valve 200 to fail to switch to the cut-off position smoothly. In addition, this setting makes the one-way valve 200 a straight-through design, and the process is simple.

[0054] In this embodiment, the cylinder 211 can be fixed to the air outlet pipe 400 by welding.

[0055] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the cylinder 211 is provided with a mounting protrusion 2112 extending radially toward the hollow cavity 2111 , wherein the mounting plate 212 is fixedly disposed on the mounting protrusion 2112 .

[0056] By providing a mounting protrusion 2112 extending toward the hollow cavity 2111 on the cylinder 211, on the one hand, the mounting protrusion 2112 can be used to support the mounting plate 212, and on the other hand, the mounting protrusion 2112 can also be used to position the mounting plate 212 during the assembly process.

[0057] In this embodiment, the mounting plate 212 can be fixedly connected to the mounting protrusion 2112 by welding.

[0058] In this embodiment, the mounting protrusion 2112 may be an annular structure, that is, the mounting protrusion 2112 supports and positions the mounting plate 212 at each position along the circumference of the cylinder 211 .

[0059] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the mounting protrusion 2112 is arranged at the lowermost end of the cylinder 211, that is, the mounting plate 212 is fixed to the bottom of the cylinder 211. This arrangement is convenient for processing and manufacturing the mounting protrusion 2112, and at the same time, it is also convenient for fixing the mounting plate 212.

[0060] Please continue to refer to Figure 6In this embodiment, the mounting plate 212 is provided with three flow holes 2121. Specifically, the mounting plate 212 has a hollow structure, and the hollow structure is provided with three connecting beams 2122. The three connecting beams 2122 divide the hollow structure into three flow holes 2121. This arrangement can not only ensure the smoothness of the refrigerant flowing from the mounting plate 212 to the hollow cavity 2111, but also can realize the reinforcement of the mounting plate 212 structure and suppress the structural deformation of the mounting plate 212.

[0061] Please continue to refer to Figure 4 In this embodiment, in the conduction position, the distance between the valve core 220 and the outlet of the gas outlet pipe 400 is greater than 4 cm. Figure 4 The b in it means, that is: b>4cm.

[0062] By setting the distance between the valve core 220 and the pipe mouth of the air outlet pipe 400 to be greater than 4 cm, when the oil separator is connected to other pipelines, when other pipelines extend from the pipe mouth of the air outlet pipe 400 into the air outlet pipe 400 and are welded to the air outlet pipe 400, they will not collide with the valve core 220, which provides a certain degree of protection for the valve core 220 and facilitates the implementation of the welding operation.

[0063] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the one-way valve 200 may further include an elastic element 240. Specifically, the elastic element 240 connects the valve core 220 and the mounting plate 212. The elastic element 240 is used to ensure that the valve core 220 always has a tendency to remain in the conducting position.

[0064] By providing the elastic element 240, the valve core 220 always has a tendency to remain in the conducting position, so as to ensure that the refrigerant separated by the oil separator body 100 can be smoothly discharged through the outlet pipe 400. Moreover, the provision of the elastic element 240 also realizes the connection between the valve core 220 and the valve seat 210, and prevents the valve core 220 from being separated from the valve seat 210.

[0065] In this embodiment, the elastic element 240 may be a coil spring. Specifically, the number of the elastic elements 240 is three, and the three elastic elements 240 are arranged at intervals in the circumferential direction. By setting the elastic element 240 as a coil spring, the cost of the elastic element 240 can be reduced; by setting the number of the elastic elements 240 to three, the elastic element 240 has sufficient support stiffness for the valve core 220, thereby ensuring the stability of the valve core 220 in the conduction position.

[0066] In other embodiments, the number of elastic elements 240 may be other numbers, such as one, two, or four.

[0067] Please continue to refer to Figure 6 In this embodiment, a base 2123 is provided in the middle of each connecting beam 2122, and three elastic elements 240 are respectively connected to the three bases 2123 in a one-to-one correspondence, thereby achieving the fixation of the elastic element 240 and the mounting plate 212. Specifically, the elastic element 240 can be fixedly connected to the corresponding base 2123 by welding.

[0068] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the valve core 220 may include a connecting plate 221 and a sphere 222. Specifically, the connecting plate 221 is located between the elastic element 240 and the sphere 222. The valve core 220 is connected to the elastic element 240 through the connecting plate 221, wherein the outer diameter of the connecting plate 221 is smaller than the inner diameter of the cylinder 211, and the valve core 220 is sealed with the cavity wall of the hollow cavity 2111 through the sphere 222.

[0069] By configuring the valve core 220 to include a connecting plate 221 and a sphere 222, on the one hand, the sphere 222 is sealed with the cavity wall of the hollow cavity 2111, so that a line-surface fit seal is achieved between the valve core 220 and the valve seat 210, the seal is reliable, and the processing cost of the valve core 220 and the valve seat 210 can be reduced, and the sphere 222 has a simple structure. On the other hand, the connecting plate 221 is used as an intermediate transition component to realize the assembly connection between the sphere 222 and the elastic element 240, which can improve the installation reliability of the sphere 222. At the same time, the elastic element 240 has the same installation height at the end close to the valve core 220, thereby ensuring that multiple elastic elements 240 have the same length specification, which is convenient for the connection and setting of the elastic element 240.

[0070] In addition, by setting the outer diameter of the connecting plate 221 to be smaller than the inner diameter of the cylinder 211, it is also possible to prevent friction between the connecting plate 221 and the cylinder 211 during the movement of the valve core 220. While reducing the movement resistance of the valve core 220, it also provides a certain degree of protection for the cylinder 211, preventing the cavity wall of the hollow cavity 2111 from being worn and unable to reliably seal with the valve core 220.

[0071] In this embodiment, the elastic element 240 can be connected to the connecting plate 221 by welding; the sphere 222 can also be connected to the connecting plate 221 by welding.

[0072] In this embodiment, the sphere 222 may be a steel ball, and the diameter of the sphere 222 is not less than the inner diameter of the cylinder 211 .

[0073] Please continue to refer to Figure 4 In this embodiment, the distance between the one-way valve 200 and the gas outlet 110 is not less than 1 cm and not more than 2 cm. Specifically, the distance between the one-way valve 200 and the gas outlet 110 can be Figure 4 The c in it represents, that is: 1cm≤c≤2cm.

[0074] By limiting the distance between the one-way valve 200 and the air outlet 110 within the above range, on the one hand, it is possible to avoid the situation where the refrigerant collides with the one-way valve 200 at the moment of air outlet and is blocked, thereby increasing the refrigerant flow resistance, due to the one-way valve 200 being too close to the air outlet 110. On the other hand, it is also possible to avoid the situation where the air outlet path is extended due to the one-way valve 200 being too far from the air outlet 110.

[0075] Figure 7 The internal structure diagram of the oil return pipe 500 of the oil separator provided in this embodiment. Figure 7 As shown, in this embodiment, the filter 300 may include a fixing seat 310 and a filter net 320 . Specifically, the fixing seat 310 is fixedly connected to the oil return pipe 500 , and the filter net 320 is installed on the fixing seat 310 , wherein the filter net 320 is used to filter the oil flowing out from the oil return port 130 .

[0076] This form of filtering the return oil using the filter 320 not only has a simple structure but also can reduce the filtering cost.

[0077] Please continue to refer to Figure 7 In this embodiment, the distance between the filter 300 and the nozzle of the oil return pipe 500 is greater than 4 cm. Specifically, the distance between the filter 300 and the nozzle of the oil return pipe 500 can be Figure 7 The d in it means, that is: d>4cm.

[0078] By setting the distance between the filter 300 and the pipe opening of the oil return pipe 500 to be greater than 4 cm, when the oil separator is connected to other pipelines, when other pipelines extend from the pipe opening of the oil return pipe 500 into the oil return pipe 500 and are welded to the oil return pipe 500, they will not collide with the filter screen 320, which plays a certain protective role on the filter screen 320 and facilitates the implementation of the welding operation.

[0079] Please continue to refer to Figure 7 In this embodiment, a plurality of limiting protrusions 510 are provided on the inner wall of the oil return pipe 500. Specifically, the plurality of limiting protrusions 510 are arranged at intervals along the axial direction of the oil return pipe 500. A slot 520 is formed between any two adjacent limiting protrusions 510, and the fixing seat 310 is clamped in the slot 520.

[0080] This arrangement can achieve reliable installation of the fixing base 310 and has a simple structure.

[0081] In this embodiment, the fixing seat 310 may be a copper cap.

[0082] In this embodiment, the limiting protrusion 510 is annular, and the clamping groove 520 can be an annular groove. This arrangement can fix the fixing base 310 at various positions of the fixing base 310 along its circumference, thereby improving the installation reliability of the fixing base 310.

[0083] Please continue to refer to Figure 7 In this embodiment, the filter screen 320 can be cup-shaped. Specifically, the filter screen 320 is fixedly connected to the fixing base 310 through the cup-shaped opening, and the filter screen 320 is located on the side of the fixing base 310 away from the oil return port 130, wherein the cross-section of the filter screen 320 gradually decreases from the oil return port 130 toward the pipe mouth of the oil return pipe 500.

[0084] The above-mentioned structure and installation design of the filter 320 enable the oil flow rate to be increased by utilizing the change in the cross-section of the filter 320 during the process of the oil moving from the oil return port 130 to the nozzle of the oil return pipe 500, thereby ensuring the smooth flow of the oil to the nozzle of the oil return pipe 500.

[0085] In this embodiment, the filter screen 320 may be made of stainless steel.

[0086] Figure 8 The structure diagram of the filter 300 of the oil separator provided in this embodiment. Figure 8 As shown, the filter 300 may further include a bracket 330 . Specifically, the bracket 330 is fixedly connected to the fixing seat 310 , and the bracket 330 supports the filter screen 320 .

[0087] By providing a bracket 330 for supporting the filter screen 320 , the filter screen 320 has a certain rigidity, thereby preventing the filter screen 320 from being deformed to a large extent and thus failing to filter the oil.

[0088] In this embodiment, the material of the bracket 330 may be stainless steel, and the bracket 330 may be a cup-shaped structure matching the inner cavity of the filter screen 320 .

[0089] It should be noted that, in the present embodiment, the oil separator can be specially matched to multiple compressors arranged in parallel in a multi-split air-conditioning unit. The oil separator can be directly distinguished from aspects such as the number of components and the style of piping. At the same time, words such as "specially for multi-split modules in parallel" can be added to the oil separator to increase its recognition and make it easy to distinguish it from traditional oil separators.

[0090] It should also be noted that, in this embodiment, the "pipelines" mentioned above can all be copper pipes.

[0091] Please continue to refer to Figure 3In this embodiment, the air inlet 120 is connected to the air inlet pipe 600 to facilitate the connection of the oil separator with the output end of the compressor.

[0092] In addition, this embodiment also provides a multi-split air-conditioning unit, including a plurality of compressors operating in parallel, and the above-mentioned oil separator is provided at the output end of each compressor, wherein the output end of the compressor is connected to the air inlet 120 of the oil separator.

[0093] By arranging the above-mentioned oil separator in the multi-split air-conditioning unit, accordingly, the multi-split air-conditioning unit has all the advantages of the above-mentioned oil separator, which will not be described one by one here.

[0094] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

[0095] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0096] In the above embodiments, the descriptions of directions such as “upper”, “lower”, “side”, etc. are all based on the drawings.

[0097] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil separator, characterized in that: The oil separator comprises an oil separator body (100), a one-way valve (200) and a filter (300); the oil separator body (100) is provided with an air outlet (110), an air inlet (120) and an oil return port (130); the air outlet (110) is connected to an air outlet pipe (400); the one-way valve (200) is located inside the air outlet pipe (400) and is used to make the oil separator body (100) unidirectionally conductive in the direction of the air outlet pipe (400); the oil return port (130) is connected to an oil return pipe (500); the filter (300) is located inside the oil return pipe (500), and the filter (300) is spaced a set distance from the oil return port (130).

2. The oil separator according to claim 1, characterized in that: The one-way valve (200) comprises a valve seat (210) and a valve core (220), wherein the valve seat (210) is fixedly connected to the air outlet pipe (400), and the valve seat (210) is provided with a flow passage (230); the valve core (220) is movably arranged on the valve seat (210), and the valve core (220) has a cut-off position for blocking the flow passage (230), and a conducting position for opening the flow passage (230).

3. The oil separator according to claim 2, characterized in that: The valve seat (210) includes a cylinder (211) and a mounting plate (212), the cylinder (211) having a hollow cavity (2111) penetrating the cylinder (211) along the flow direction of the refrigerant, the mounting plate (212) being fixedly arranged on the hollow cavity (2111), the mounting plate (212) being provided with a flow hole (2121) communicating with the hollow cavity (2111), the flow hole (2121) and the hollow cavity (2111) together forming the flow channel (230); the cavity wall of the hollow cavity (2111) forming a sealing surface for cooperating with the valve core (220); and / or, in the conduction position, the distance between the valve core (220) and the pipe mouth of the outlet pipe (400) is greater than 4 cm.

4. The oil separator according to claim 3, characterized in that: The cylinder (211) is provided with a mounting protrusion (2112) extending radially toward the hollow cavity (2111), and the mounting plate (212) is fixedly arranged on the mounting protrusion (2112).

5. The oil separator according to claim 3, characterized in that: The one-way valve (200) further comprises an elastic element (240), wherein the elastic element (240) connects the valve core (220) and the mounting plate (212), and the elastic element (240) is used to ensure that the valve core (220) always has a tendency to remain in the conducting position.

6. The oil separator according to claim 5, characterized in that: The valve core (220) includes a connecting plate (221) and a sphere (222), wherein the connecting plate (221) is located between the elastic element (240) and the sphere (222), and the valve core (220) is connected to the elastic element (240) via the connecting plate (221), wherein the outer diameter of the connecting plate (221) is smaller than the inner diameter of the cylinder (211), and the valve core (220) is sealed with the cavity wall of the hollow cavity (2111) via the sphere (222).

7. The oil separator according to claim 1, characterized in that: The distance between the one-way valve (200) and the air outlet (110) is not less than 1 cm and not more than 2 cm.

8. The oil separator according to any one of claims 1 to 7, characterized in that: The filter (300) comprises a fixing seat (310) and a filter screen (320), wherein the fixing seat (310) is fixedly connected to the oil return pipe (500), and the filter screen (320) is installed on the fixing seat (310), and the filter screen (320) is used to filter the oil flowing out from the oil return port (130); and / or, the set distance is not less than 2 cm and not more than 3 cm; and / or, the distance between the filter (300) and the pipe opening of the oil return pipe (500) is greater than 4 cm.

9. The oil separator according to claim 8, characterized in that: The inner wall of the oil return pipe (500) is provided with a plurality of limiting protrusions (510), the plurality of limiting protrusions (510) are arranged at intervals along the axial direction of the oil return pipe (500), a slot (520) is formed between any two adjacent limiting protrusions (510), and the fixing seat (310) is fixed in the slot (520); and / or the filter screen (320) is cup-shaped, and the filter screen (320) is fixedly connected to the fixing seat (310) through an opening of the cup shape. , and the filter (320) is located on a side of the fixing seat (310) away from the oil return port (130), wherein the cross-section of the filter (320) gradually decreases from the oil return port (130) toward the pipe mouth of the oil return pipe (500); and / or the filter (300) further comprises a bracket (330), the bracket (330) is fixedly connected to the fixing seat (310), and the bracket (330) supports the filter (320).

10. The oil separator according to claim 9, characterized in that The limiting protrusion (510) is ring-shaped, and the clamping groove (520) is an annular groove.

11. A multi-connected air conditioning unit, characterized in that: It comprises a plurality of compressors operating in parallel, and the output end of each compressor is provided with the oil separator according to any one of claims 1 to 10, wherein the output end of the compressor is connected to the air inlet (120) of the oil separator.

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