CN219141179U - Oil separator and air conditioning unit equipped with same - Google Patents

Abstract

The application relates to the technical field of air conditioners and provides an oil separator and an air conditioning unit with the same. The oil separator comprises a separation container and at least two oil return pipes; at least two oil outlet connecting holes are arranged on the separating container at intervals along the circumferential direction of the separating container, and each oil outlet connecting hole is connected with an oil return pipe; the height of the pipe orifice of the at least two oil return pipes positioned outside the separation container is larger than the height of the pipe orifice of the respective oil return pipe extending into the separation container along the axial direction of the separation container, and the heights of the pipe orifices of the at least two oil return pipes extending into the separation container are different. The oil separator provided by the application corresponds to at least two oil return pipes through the arrangement of the at least two oil outlet connecting holes, so that at least two oil return oil paths are corresponding to each other, and oil is fully returned; and at least two oil return pipes extend into the pipe orifices in the separation container to be different in height, so that oil return at different positions is met. Therefore, the normal oil return amount of the compressor can be met, and the oil return safety is improved.

Description

Oil separator and air conditioning unit equipped with same

Technical Field

The application relates to the technical field of air conditioners, in particular to an oil separator and an air conditioning unit provided with the oil separator.

Background

With the wide application of the electric low-temperature unit, the operating environment range of the air conditioning unit is gradually increased, and the operating environment range can be from-25 ℃ to 48 ℃. Therefore, due to the increase of the range of the operation environment, the performance requirement of the air conditioning unit is higher, and particularly, the oil return reliability of the compressor in the air conditioning unit is higher. Although the oil return amount of the compressor is ensured by adding the oil separator in the air conditioning unit used at present, the oil return safety during the wide-range operation cannot be met.

Based on this, it is desirable to provide a structure capable of improving the oil return capability when the air conditioning unit is operated in a wide range.

Disclosure of Invention

Based on this, it is necessary to provide an oil separator capable of improving oil return capability when the air conditioning unit is used for a wide range of operation.

An oil separator comprises a separation container and at least two oil return pipes; at least two oil outlet connecting holes are arranged on the separation container at intervals along the circumferential direction of the separation container, and each oil outlet connecting hole is connected with an oil return pipe; and the heights of the pipe orifices of the at least two oil return pipes, which are positioned outside the separation container, are larger than the heights of the pipe orifices of the oil return pipes, which extend into the separation container, along the axial direction of the separation container, and the heights of the pipe orifices of the at least two oil return pipes, which extend into the separation container, are different.

That is, the oil separator provided by the application corresponds to at least two oil return pipes through the arrangement of at least two oil outlet connecting holes, and the pipe orifice height of the oil return pipes outside the separation container is larger than the pipe orifice height of the respective oil return pipes extending into the separation container, so that at least two oil return oil paths are corresponding to fully return oil. And because the pipe orifices that at least two oil return pipes stretch into in the separating vessel are high different, can be along the back flow pipe backward flow that corresponds with it when being located different liquid level height to the compressor, for example, the higher oil of part being located the liquid level flows back to the compressor along the oil return pipe that corresponds of pipe orifice height that is located the eminence, and the lower oil of part being located the liquid level flows back to the compressor along the oil return pipe that corresponds of pipe orifice height that is located the eminence to satisfy the oil return of different positions. Therefore, the oil separated by the separating container is enabled to fully flow back to the compressor, so that the normal oil return quantity of the compressor is met, and the oil return safety is improved.

In one embodiment, the number of the oil outlet connecting holes is two, and the two oil return pipes correspond to each other; the oil return pipe with the pipe orifice positioned at the lower part is taken as a main oil return pipe, and the oil return pipe with the pipe orifice positioned at the higher part is taken as an auxiliary oil return pipe along the axial direction of the separation container; the height of the pipe orifice of the first end of the main oil return pipe is smaller than that of the pipe orifice of the second end of the main oil return pipe, and the height of the pipe orifice of the first end of the auxiliary oil return pipe is smaller than that of the pipe orifice of the second end of the auxiliary oil return pipe.

In one embodiment, the separation vessel has an inner diameter d; in the axial direction of the separation container, the volume below a pipe orifice communicated with the separation container by the main oil return pipe is taken as a main oil return volume in the separation container, and the height of the main oil return volume in the axial direction of the separation container is h; wherein,

in one embodiment, the height of the bottom wall of the pipe orifice, which is communicated with the separation container, of the main oil return pipe is not less than 5mm along the axial direction of the separation container.

In one embodiment, the height of the bottom wall of the pipe orifice, which is communicated with the separation container, of the main oil return pipe is not more than 40mm along the axial direction of the separation container.

In one embodiment, the volume of an oil cavity of the compressor is B; in the axial direction of the separation container, the volume below a pipe orifice communicated with the separation container by the auxiliary oil return pipe is taken as an auxiliary oil return volume in the separation container, and the axial height of the auxiliary oil return volume in the separation container is D; wherein D is more than or equal to 0.88B and less than or equal to 1.3B.

In one embodiment, the axial direction of the separation container is the same or tends to be the same in the axial direction of at least two of the oil outlet connection holes.

In one embodiment, the diameter of the oil return pipe is between 1.5mm and 2.5 mm; and/or the length of the oil return pipe is between 200mm and 400 mm; and/or the oil return pipe adopts a capillary tube.

In one embodiment, the main oil return pipe is in an L-shaped arrangement, and the auxiliary oil return pipe is in a U-shaped arrangement.

The application also provides an air conditioning unit, which can improve the oil return safety of the compressor while meeting the requirements of refrigeration and heating.

An air conditioning unit comprises the oil separator, a compressor, a heat exchanger and an indoor unit; one end of at least two oil return pipes, which are positioned outside the separation container, is directly connected with the first feed inlet of the compressor, and the other part of at least two oil return pipes is connected with the first feed inlet of the compressor after participating in a refrigerant circulation loop.

In one embodiment, the air conditioning unit further comprises an economizer having a first flow line and a second flow line, the first flow line being in communication between the heat exchanger and the throttle assembly, a heat exchanger, a throttle assembly, and a throttle valve, the second flow line being in communication with the throttle valve and the compressor; the throttle valve is arranged in parallel with the throttle assembly; wherein the second flow conduit is configured to exchange heat with the first flow conduit.

In one embodiment, the throttle assembly includes a primary throttle and a secondary throttle, the primary throttle and the secondary throttle being disposed in parallel.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a front view of an oil separator provided herein;

FIG. 2 is a cross-sectional view of A-A of FIG. 1;

FIG. 3 is a top view of an oil separator provided herein;

FIG. 4 is a cross-sectional view of B-B in FIG. 3;

fig. 5 is a schematic diagram of an air conditioning unit provided in the present application.

Reference numerals: 10. a separation vessel; 20. an oil return pipe; 21. a main oil return pipe; 22. an auxiliary oil return pipe; 100. an oil separator; 101. a main oil return volume; 102. an auxiliary oil return volume; 200. a compressor; 300. a heat exchanger; 400. an indoor unit; 500. an economizer; 510. a first flow line; 520. a second flow line; 511. a filter; 521. a throttle valve; 600. a throttle assembly; 610. a main throttle; 620. an auxiliary throttling element; 700. a reservoir; 800. a gas-liquid separator; 900. a four-way reversing valve; 1001. a second feed inlet; 1002. a second discharge port; 1100. a first one-way valve; 1200. a second one-way valve; 1300. a third one-way valve; 1400. and a fourth one-way valve.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 5, an embodiment of the present application provides an air conditioning unit including the above-described oil separator 100, compressor 200, heat exchanger 300, and indoor unit 400; the compressor 200 has a first inlet and a first outlet, the oil separator 100 is connected between the first outlet of the compressor 200 and the heat exchanger 300, and the indoor unit 400 is connected between the heat exchanger 300 and the first inlet of the compressor 200. The refrigerant flowing out of the compressor 200 is separated by the oil separator 100 and then flows to the heat exchanger 300, exchanges heat by the heat exchanger 300 and then flows to the indoor unit 400 and then flows to the compressor 200; alternatively, the refrigerant flowing out of the compressor 200 is separated by the oil separator 100, flows into the indoor unit 400, exchanges heat with the indoor unit 400, flows into the heat exchanger 300, and flows into the compressor 200. The oil separator 100 can separate oil mixed in the refrigerant and return the oil to the compressor 200. It should be noted that: the connection or communication described herein may be a direct connection or communication or an indirect connection or communication.

In actual use, the oil separator 100 has a second feed port 1001 and a second discharge port 1002, the second feed port 1001 of the oil separator 100 being connected to the first discharge port of the compressor 200, the second discharge port 1002 of the oil separator 100 being in fluid communication with the heat exchanger 300. Meanwhile, the oil separator 100 further has an oil return port to communicate with the first feed port of the compressor 200 to satisfy oil return of the compressor 200. Therefore, if the compressor 200 can sufficiently return oil, the compressor 200 can be more advantageously oriented in use. And how much the oil returns to the compressor 200 depends on the performance of the oil separator 100.

Accordingly, an oil separator capable of ensuring sufficient oil return of the compressor 200 is also provided in an embodiment of the present application. The oil separator will be described in detail first.

As shown in fig. 1, 2 and 4, the oil separator 100 includes a separation vessel 10 and at least two oil return pipes 20 by way of example; at least two oil outlet connecting holes are arranged on the separating container 10 at intervals along the circumferential direction of the separating container, and each oil outlet connecting hole is connected with an oil return pipe 20; wherein, along the axial direction of the separation container 10, the height of the pipe orifice of each oil return pipe 20 positioned outside the separation container 10 is larger than the height of the pipe orifice of each oil return pipe 20 extending into the separation container 10, and the heights of the pipe orifices of at least two oil return pipes 20 extending into the separation container 10 are different.

As shown in fig. 1 to 4, further, the second inlet 1001 and the second outlet 1002 of the oil separator 100 are provided on the separation vessel 10, and are spaced apart from at least two oil outlet connection holes. Since the high-temperature and high-pressure gaseous refrigerant is generally sent from the compressor 200, the gas is floated upward, and the second discharge port 1002 of the oil separator 100 is provided at the upper portion of the separation vessel 10; meanwhile, the separated oil flows downward, so that an oil outlet connection hole is provided at the lower portion of the separation vessel 10. Therefore, the oil return pipe connected to the oil outlet connection hole is used for oil return, and the pipe orifice of the oil return pipe 20 extending into the separation vessel 10 serves as the oil return port of the oil separator 100. In actual use, the separation vessel 10 is placed vertically, with the axis of the separation vessel 10 being oriented vertically. Therefore, based on such a placement position, the above-mentioned nozzle height, i.e., the height from bottom to top in the vertical direction, is referred to. One end of each oil return pipe 20 penetrates through the corresponding oil outlet connecting hole and extends into the separating container 10 so as to be fully contacted with oil liquid, and full oil return is achieved.

The heights referred to below are all based on the height from bottom to top in the vertical direction. Of course, the height of the spout may be determined based on the second outlet 1002 of the oil separator 100, and based on the direction from the second outlet 1002 toward the side closer to the second outlet 1002 in the axial direction of the separation vessel 10.

As can be seen from the above, the oil separator 100 corresponds to at least two oil return pipes 20 through the arrangement of at least two oil outlet connection holes, so as to correspond to at least two oil return passages, so as to fully return oil. Moreover, since the heights of the nozzles of the at least two oil return pipes 20 extending into the separation vessel 10 are different, when the oil at different liquid levels can flow back to the compressor 200 along the corresponding return pipes, for example, in this embodiment, part of the oil at higher liquid levels flows back to the compressor 200 along the oil return pipes 20 corresponding to the nozzle heights at higher liquid levels, and part of the oil at lower liquid levels flows back to the compressor 200 along the oil return pipes 20 corresponding to the nozzle heights at lower liquid levels, so as to meet the oil return requirements of the oil return at different positions. Thus, the oil separated by the separation vessel 10 is caused to sufficiently flow back to the compressor 200, so that the normal oil return amount of the compressor 200 is satisfied, and the oil return safety is improved.

As shown in fig. 1 and 4, in some embodiments, the axes of at least two oil outlet connection holes are the same or tend to be the same in height along the axial direction of the separation vessel 10. That is, the installation height of each oil return pipe 20 with respect to the separation vessel 10 is the same. This arrangement not only facilitates the formation of the oil outlet connection hole in the separation vessel 10, but also allows the height of the nozzle of the oil return pipe 20 to be adjusted with reference to the installation height so that oil return is sufficient. The nozzle height herein includes the height of the nozzle at the end of the return pipe 20 extending into the separation vessel 10 and the height of the nozzle at the end of the return pipe 20 located outside the separation vessel 10. For convenience of description, the end of the oil return pipe 20 extending into the separation vessel 10 is taken as a first end, and the end of the oil return pipe 20 located outside the separation vessel 10 is taken as a second end.

In actual use, a flange is provided at one end of each oil outlet connection hole facing the outside of the separation container 10, and the flange can be wrapped on the outside of the corresponding oil return pipe 20 to increase the contact area with the oil return pipe 20. In this way, not only the effect of the welding stress on the separation vessel 10 is reduced while the welding fixation is satisfied, but also the reliability of fixation of the oil return pipe 20 to the separation vessel 10 is improved.

As shown in fig. 1 to 4, the number of the oil outlet connection holes is exemplified by two, and two oil return pipes 20 are correspondingly provided. At this time, in the axial direction of the separation vessel 10, the oil return pipe 20 extending into the inner end of the separation vessel 10 and having the pipe orifice height at the lower position is used as the main oil return pipe 21, and the oil return pipe 20 extending into the inner end of the separation vessel 10 and having the pipe orifice height at the higher position is used as the auxiliary oil return pipe 22; the height of the pipe orifice of the first end of the main oil return pipe 21 is smaller than that of the pipe orifice of the second end of the main oil return pipe 21, and the height of the pipe orifice of the first end of the auxiliary oil return pipe 22 is smaller than that of the pipe orifice of the second end of the auxiliary oil return pipe 22. Specifically, the height of the nozzle at the first end of the main oil return pipe 21 is lower than that of the nozzle at the first end of the auxiliary oil return pipe 22. The second end of the main return line is in fluid communication with the first inlet of the compressor 200 and the second end of the auxiliary return line 22 is in fluid communication with the first inlet of the compressor 200 after participating in the refrigerant cycle to facilitate delivery of separated oil into the compressor 200. Wherein the main return line is for a normal return state, in direct fluid communication with the first inlet port of the compressor 200; the auxiliary oil return pipe 22 mainly plays an auxiliary role, is suitable for special working conditions, and the auxiliary oil return pipe 22 is communicated with a circulation loop of the refrigerant in the air conditioning unit so as to flow to the heat exchanger 300 along with the gaseous refrigerant flowing out through the oil separator 100, flow to the indoor unit 400 after heat exchange through the heat exchanger 300, and then flow back to the compressor 200 through the first feed inlet of the compressor 200.

As shown in fig. 2 and 4, if the volume of the separation vessel 10 below the height of the nozzle at the first end of the return pipe is taken as the return oil volume, the volume of the separation vessel 10 below the height of the nozzle at the first end of the main return pipe 21 is taken as the main return oil volume 101, and the volume of the separation vessel 10 below the height of the nozzle at the first end of the auxiliary return pipe 22 is taken as the auxiliary return oil volume 102. Because the height of the orifice at the first end of the main oil return pipe 21 is smaller than the height of the orifice at the first end of the auxiliary oil return pipe 22, the volume of the main oil return volume 101 is smaller than the volume of the auxiliary oil return volume 102, and the height of the main oil return volume 101 is smaller than the volume of the auxiliary oil return volume 102.

In actual use, the high-temperature and high-pressure gaseous refrigerant flowing from the first discharge port of the compressor 200 to the oil separator 100 is separated by the separation vessel 10, and the oil is collected in a position below the separation vessel 10. Therefore, when the liquid level of the oil reaches the height of the nozzle of the main oil return pipe 21, the oil can directly flow to the first feed inlet of the compressor 200 along the main oil return pipe 21, and oil return is realized. However, under some conditions, when the level of the oil reaches the height of the orifice of the auxiliary oil return pipe 22, the oil flows out along the auxiliary oil return pipe 22 onto a pipeline for conveying the refrigerant in the air conditioning unit, for example, a pipeline between the second discharge port 1002 of the oil separator 100 and the heat exchanger 300, and flows along a refrigerant circulation loop of the air conditioning unit along with the refrigerant, so as to finally flow back into the compressor 200; thus, the oil liquid reflux can be realized. Thus, the main oil return pipe 21 ensures the oil return amount of the compressor, and the auxiliary oil return pipe 22 does not cause the oil return amount of the compressor to be too large, so that the oil running of the compressor is caused, and the stability of oil return is ensured.

The specific construction of the main oil return pipe 21 will be described in detail.

As shown in fig. 1, 2 and 4, in actual use, although the height of the nozzle at the first end of the main oil return pipe 21 is smaller than that of the nozzle at the first end of the auxiliary oil return pipe 22, the height of the nozzle at the first end of the main oil return pipe 21 is not too small (to ensure sufficient oil return). In addition, if the height of the nozzle at the first end of the main return pipe 21 is small, impurities deposited at the bottom in the separation vessel 10 may be introduced into the compressor 200 through the main return pipe 21, thereby causing damage to the compressor 200. At the same time, the height of the nozzle at the first end of the main oil return pipe 21 is not too high. If the oil pressure is too high, an oil storage area may be formed at the bottom of the separation vessel 10, which may affect the oil return performance of the compressor 200, resulting in poor oil return.

Meanwhile, the volume of the main oil return volume 101 is combined with the height relation of the nozzle at the first end of the main oil return pipe 21, so that the main oil return volume 101 is not too large or too small. Furthermore, the main oil return volume 101 is still based on the separation vessel 10, so the volume of the main oil return volume 101 is also related to the inner diameter of the separation vessel 10. In some specific embodiments, the main oil return volume 101 must not be greater than 1L.

Therefore, based on this, it is necessary to define the nozzle height of the first end of the main return pipe 21 in detail. Illustratively, with an inner diameter d of the separation vessel 10, the main scavenge volume 101 has a height h along the axial direction of the separation vessel 10; wherein,

when the value of d is obtained, the height h of the main oil return volume 101 in the axial direction of the separation vessel 10 is obtained, and thus the nozzle height of the first end of the main oil return pipe 21.

The above-described method of determining h does not consider the oil density.

Further, as some of the preferred embodiments, h must not be less than 5mm and h must not be greater than 40mm. For example, h is 6mm, 20mm, 35mm or 40mm.

Still further, as shown in fig. 4, if the main oil return pipe 21 is L-shaped, i.e. the transverse section of the main oil return pipe 21 passes through the corresponding oil outlet connecting hole, and extends into the separating container 10 along the radial direction of the separating container 10, the vertical section of the main oil return pipe 21 is located outside the separating container 10 and extends towards the side close to the second discharge port 1002 along the axial direction of the separating container 10, so that the height of the nozzle at the second end of the main oil return pipe 21 is greater than that of the nozzle at the first end of the main oil return pipe 21. The arrangement meets the foundation of oil return based on the siphon principle. Moreover, since the first end of the main oil return pipe 21 extends in the radial direction of the separation vessel 10, and the tubular structure of the main oil return pipe 21 is combined at this time, the position of the bottom wall of the orifice of the first end of the main oil return pipe 21 is the height of the orifice of the first end of the main oil return pipe 21, that is, the height h of the main oil return volume 101 in the axial direction of the separation vessel 10. Therefore, the height of the nozzle bottom wall of the main return pipe 21 extending into the separation vessel 10 must not be less than 5mm, and the height of the nozzle bottom wall of the main return pipe 21 extending into the separation vessel 10 must not be more than 40mm.

The specific configuration of the auxiliary oil return pipe 22 is described in detail below.

As yet another example, as shown in fig. 2, with the oil chamber volume of the compressor 200 being B, the auxiliary oil return volume 102 has a height D along the axial direction of the separation vessel 10; wherein D is more than or equal to 0.88B and less than or equal to 1.3B. Specifically, during operation of the air conditioning unit, if the air conditioning unit is in an optimal condition for oil return of the compressor 200, a portion of oil may be accumulated in the oil separator 100. At this time, in order to prevent the oil return amount of the compressor 200 from being excessive as much as possible, a part of the oil flows into the circulation circuit of the refrigerant through the auxiliary oil return pipe 22, and then flows into the compressor 200 again after participating in the circulation circuit with the refrigerant. Accordingly, the height of the auxiliary oil return volume 102, and thus the height of the orifice of the auxiliary oil return pipe 22 extending into the separation vessel 10, is determined based on the oil chamber volume of the compressor 200.

In a particular embodiment, the secondary return volume 102 has a height D of 0.88B, 0.98B, or 1.3B along the axial direction of the separation vessel 10.

Note that, the relationship between the height of the nozzle at the first end of the auxiliary oil return pipe 22 and the auxiliary oil return volume 102 is similar to that of the main oil return pipe 21, and thus will not be described again.

With continued reference to fig. 2, further, the auxiliary oil return pipe 22 is disposed in a U-shape. The auxiliary return line 22 also employs a siphon action to satisfy the return operation. Wherein the height of the nozzle at the first end of the auxiliary oil return pipe 22 is smaller than that of the nozzle at the second end of the auxiliary oil return pipe 22.

In addition, in addition to the above oil return arrangement using the main oil return pipe 21 and the auxiliary oil return pipe 22, the oil supplement amount of the compressor 200 itself may be set to ensure that the compressor 200 can normally operate. When in actual use, the refrigerant flushing quantity A is determined by determining the internal volume of the air conditioning unit, and the oil quantity of the compressor 200 is F, so that the oil supplementing quantity E= (20% -40% A) -F of the compressor 200 is achieved. For example, e=20% a-F, or e=30% a-F, or e=40% a-F

Further, the diameters and the extension lengths of the main oil return pipe 21 and the auxiliary oil return pipe 22 also affect the oil return effect. In practical use, the extension length of the oil return pipe 20 should not be too large, otherwise the siphon effect is weakened, and the oil return into the compressor 200 is not facilitated; moreover, the inner diameter of the oil return pipe 20 is not too large, and the siphon effect is weakened due to the too large inner diameter, so that the oil return performance is reduced. Illustratively, the diameter of the return tube 20 is between 1.5mm and 2.5 mm; the length of the oil return pipe 20 is between 200mm and 400mm. Thus, the smooth oil return can be ensured, thereby ensuring the oil return performance of the compressor 200 and reducing the energy consumption. In a specific embodiment, the diameter of the return tube 20 is 1.5mm, 2mm or 2.5mm, and the length of the return tube 20 is 200mm, 300mm or 400mm.

Still further, the oil return pipe 20 employs a capillary tube. The capillary tube is simple in structure, low in cost, stable in flow, and not prone to failure or leakage, so that better oil return is achieved.

The above is a detailed description of the oil separator 100, and the overall structure of the air conditioning unit will be described in detail.

As shown in fig. 5, in some embodiments, the air conditioning unit further includes an economizer 500, the economizer 500 having a first flow path 510 and a second flow path 520, the first flow path 510 being communicated between the heat exchanger 300 and the indoor unit 400, the second flow path 520 being communicated between the first flow path 510 and the compressor 200; the second flow line 520 is used to exchange heat with the first flow line 510. By such arrangement, the refrigerant on the first flow path 510 can be subjected to heat exchange by the second flow path 520, so that the supercooling degree of the refrigerant in the air conditioning unit can be improved, and the heat exchange effect can be improved. In actual use, the outlet of the first flow passage 510 is also connected with a filter 511 to facilitate the filtration of the refrigerant; a throttle valve 521 is provided at an inlet of the second flow line 520 to throttle-expand the refrigerant into a low-temperature low-pressure refrigerant to exchange heat with the refrigerant in the first flow line 510.

As shown in fig. 5, in some embodiments, the air conditioning unit further includes a throttle assembly 600, where the throttle assembly 600 is connected between the heat exchanger 300 and the indoor unit 400, and the throttle assembly 600 includes a main throttle 610 and an auxiliary throttle 620, and the main throttle 610 and the auxiliary throttle 620 are disposed in parallel and may be selected according to the needs of practical applications. The auxiliary throttling element 620 adopts two capillaries, and is arranged in parallel with the main throttling element 610, and the two capillaries are also arranged in parallel. The main throttle 610 adopts an electronic expansion valve, and the electronic expansion valve controls the voltage or current applied to the valve by using an electric signal generated by the refrigerant, thereby adjusting the flow rate of the refrigerant; the capillary tube controls the flow rate of the refrigerant by means of a pressure drop generated in the longitudinal direction by its own flow resistance.

Further, a solenoid valve is arranged on the pipeline where one capillary tube is located so as to control the on-off of the capillary tube. For example, when a large circulation amount of refrigerant is required, the solenoid valve is opened; when a small circulation amount of refrigerant is required, the solenoid valve is closed.

As shown in fig. 5, in actual use, the throttle assembly 600 is connected between the indoor unit 400 and the economizer 500. Wherein the heat exchanger 300 has a first delivery port and a second delivery port. The first delivery port of the heat exchanger 300 communicates with the first flow path 510 of the economizer 500, and a first check valve 1100 is provided on the communicated line to direct the refrigerant flow from the first delivery port of the heat exchanger 300 to the first flow path 510 of the economizer 500. The second delivery port of the heat exchanger 300 communicates with an end of the throttling assembly 600 facing away from the economizer 500 and a second check valve 1200 is provided in the communicating line to direct the refrigerant flow from the throttling assembly 600 to the second delivery port of the heat exchanger 300. The end of the throttle assembly 600 facing away from the economizer 500 is fitted with a tee such that the throttle assembly 600 communicates with the indoor unit 400 and a third check valve 1300 is provided on the communicating pipe.

In still another embodiment, as shown in fig. 5, the air conditioning unit further includes a reservoir 700, the reservoir 700 is connected to the heat exchanger 300 and the economizer 500 through a tee, and a fourth check valve 1400 is provided between the reservoir 700 and the tee. By the arrangement of the liquid storage device 700, excessive refrigerant is stored for subsequent use, and the energy saving effect is improved. Meanwhile, the air conditioning unit further comprises a gas-liquid separator 800 to perform gas-liquid separation on the refrigerant, which is advantageous in preventing liquid return of the compressor. The gas-liquid separator 800 can be in fluid communication between the compressor 200 and the indoor unit 400, and the gas-liquid separator 800 can also be in fluid communication between the compressor 200 and the heat exchanger 300. In order to realize different working modes, a four-way reversing valve 900 is also needed to adjust and reverse the flow direction of the refrigerant.

To sum up, as shown in fig. 5, the air conditioning unit has a cooling condition and a heating condition:

in the refrigeration working condition, the high-temperature and high-pressure gaseous refrigerant output by the compressor 200 flows into the oil separator 100 for oil-gas separation, and then flows to the heat exchanger 300 for heat exchange through the four-way reversing valve 900; the medium-temperature high-pressure liquid refrigerant changed after heat exchange flows to the first flow path 510 of the economizer 500 through the first check valve 1100, and flows to the filter 511; the filtered liquid refrigerant flows to the indoor unit 400 through the throttling assembly 600 and the third one-way valve 1300, and becomes a gaseous refrigerant after absorbing heat by the indoor unit 400; the gaseous refrigerant flows to the gas-liquid separator 800 through the four-way reversing valve 900 to be gas-liquid separated, and the separated gaseous refrigerant flows to the compressor 200 to enter the cycle.

During heating working conditions, high-temperature and high-pressure gaseous refrigerant output by the compressor 200 flows into the oil separator 100 to be subjected to oil-gas separation, and then flows to the indoor unit 400 for heat exchange through the four-way reversing valve 900; the liquid refrigerant is changed into liquid refrigerant after heat exchange and flows to the liquid reservoir 700; from the reservoir 700, through the fourth check valve 1400 to the first flow line 510 of the economizer 500, and then through the filter 511, the restriction assembly 600 and the second check valve 1200 to the heat exchanger 300 for heat exchange; the refrigerant turns into gaseous refrigerant after heat exchange of the heat exchanger 300, and flows to the four-way reversing valve 900, so that the refrigerant enters the gas-liquid separator 800 for gas-liquid separation; the separated gaseous refrigerant is sent to the compressor 200 to enter the cycle.

The second flow line 520 in the economizer 500 may be used to cool the first flow line 510, either during a cooling mode or during a heating mode, to increase the subcooling of the refrigerant.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. -an oil separator, characterized in that the oil separator (100) comprises a separation vessel (10) and at least two oil return pipes (20);

at least two oil outlet connecting holes are arranged on the separation container (10) at intervals along the circumferential direction of the separation container, each oil outlet connecting hole is connected with an oil return pipe (20), wherein the height of a pipe orifice of the oil return pipe (20) positioned outside the separation container (10) is larger than the height of a pipe orifice of the oil return pipe (20) stretching into the separation container (10), and the heights of the pipe orifices of the oil return pipes (20) stretching into the separation container (10) are different.

2. -oil separator according to claim 1, characterised in that the number of oil outlet connection holes is two, corresponding to two oil return pipes (20);

the oil return pipe (20) with the pipe orifice positioned at the low position is taken as a main oil return pipe (21) along the axial direction of the separation container (10), and the oil return pipe (20) with the pipe orifice positioned at the high position is taken as an auxiliary oil return pipe (22);

the height of the pipe orifice of the first end of the main oil return pipe (21) is smaller than that of the pipe orifice of the second end of the main oil return pipe (21), and the height of the pipe orifice of the first end of the auxiliary oil return pipe (22) is smaller than that of the pipe orifice of the second end of the auxiliary oil return pipe (22).

3. -oil separator according to claim 2, characterised in that the inner diameter of the separation vessel (10) is d;

in the axial direction of the separation container (10), the volume below a pipe orifice communicated with the separation container (10) by the main oil return pipe (21) is taken as a main oil return volume (101) in the separation container (10), and the axial height of the main oil return volume (101) along the separation container (10) is h;

wherein ,

4. -oil separator according to claim 3, characterised in that the height of the nozzle bottom wall, in the axial direction of the separation vessel (10), of the main return pipe (21) communicating with the separation vessel (10) is not less than 5mm; and/or

The height of the bottom wall of the pipe orifice communicated with the separation container (10) by the main oil return pipe (21) is not more than 40mm.

5. -oil separator according to any one of claims 2 to 4, characterised in that the volume of the oil chamber of the compressor (200) is B;

along the axial direction of the separation container (10), taking the volume below a pipe orifice communicated with the separation container (10) by the auxiliary oil return pipe (22) in the separation container (10) as an auxiliary oil return volume (102), wherein the axial height of the auxiliary oil return volume (102) along the separation container (10) is D;

wherein D is more than or equal to 0.88B and less than or equal to 1.3B.

6. -oil separator according to claim 1, characterised in that the axial height of at least two of the oil outlet connection holes is or tends to be the same in the axial direction of the separation vessel (10).

7. -oil separator according to claim 1, characterised in that the diameter of the oil return pipe (20) is between 1.5mm-2.5 mm; and/or

The length of the oil return pipe (20) is 200mm-400 mm; and/or

The oil return pipe (20) adopts a capillary tube.

8. An air conditioning unit comprising an oil separator according to any one of claims 1 to 7, a compressor (200);

one end of at least two oil return pipes (20) positioned outside the separation container (10) is directly connected with a first feed inlet of the compressor (200), and the other parts of at least two oil return pipes (20) are connected with the first feed inlet of the compressor (200) after participating in a refrigerant circulation loop.

9. The air conditioning unit according to claim 8, further comprising an economizer (500), a heat exchanger (300), a throttle assembly (600), a throttle valve (521), the economizer (500) having a first flow line (510) and a second flow line (520), the first flow line (510) being in communication between the heat exchanger (300) and the throttle assembly (600), the second flow line (520) being in communication with the throttle valve (521) and the compressor (200); -the throttle valve (521) is arranged in parallel with the throttle assembly (600);

wherein the second flow line (520) is configured to exchange heat with the first flow line (510).

10. The air conditioning unit according to claim 9, wherein the throttle assembly (600) comprises a primary throttle (610) and a secondary throttle (620), the primary throttle (610) and the secondary throttle (620) being arranged in parallel.

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