Liquid return impact experiment device of low-pressure cavity scroll compressor

Abstract

The utility model discloses a liquid return impact experiment device for a low-pressure cavity scroll compressor, and relates to the technical field of experiment equipment, in particular to the liquid return impact experiment device for the low-pressure cavity scroll compressor. One end of a first stop valve is connected with an exhaust pipeline of a tested compressor, and the other end of the first stop valve is connected with an inlet of a gas-liquid separator; an outlet of the gas-liquid separator is connected with a second stop valve; the second stop valve is connected with the electronic expansion valve through an electronic expansion valve pipeline; the electronic expansion valve pipeline is connected with a bypass pipeline in parallel, and a third stop valve is arranged on the bypass pipeline; an outlet of the electronic expansion valve is connected with a fourth stop valve; the fourth stop valve is connected with the liquid sight glass; and the liquid sight glass is connected with an air suction pipeline of the tested compressor. According to the technical scheme, the problems that an existing compressor glow test device in the prior art is complex, whether liquid returns or not is not easily judged, the experimental period is long, and the overall liquid impact resistance of the compressor cannot be rapidly and accurately evaluated are solved.

Description

TECHNICAL FIELD

[0001] The low-pressure cavity scroll compressor liquid return impact experimental device relates to the technical field of experimental equipment, and particularly relates to a low-pressure cavity scroll compressor liquid return impact experimental device. BACKGROUND

[0002] The low-pressure cavity scroll compressor is currently widely applied in the fields of refrigeration and heating such as heat pumps, direct expansion units, and water chillers, and the reliability thereof is crucial. In the unit, if gaseous refrigerant is returned to the suction pipeline, the compressor can compress the gaseous refrigerant into high-pressure gaseous refrigerant, and at this time, the reliability of the compressor is not affected. However, if liquid refrigerant is returned to the suction pipeline, since the liquid is not compressible, the compression of the liquid refrigerant will cause the scroll disc cross ring and other components of the compressor to bear a high load, and even the compressor may be damaged, so the unit is designed to avoid liquid return operation of the compressor as much as possible. However, under certain conditions, liquid return of the suction pipeline of the unit cannot be avoided, and the compressor will inevitably operate with liquid, such as the first start-up process of the unit after refrigerant charging, the compressor will suck in a large amount of liquid refrigerant in the first few seconds before operation; during the defrosting process of the heat pump unit, a large amount of liquid refrigerant is also sucked into the suction pipeline; after the unit is stopped for a long time, the refrigerant migrates back to the compressor due to temperature difference, and liquid refrigerant is sucked in during start-up.

[0003] In view of the above-mentioned use condition of the compressor that cannot avoid liquid return operation, the compressor manufacturer increases the design margin of the key components of the compressor to solve the reliability of the compressor, such as the strength of the scroll disc and the cross slide ring, and simulates the relevant working conditions on the water-cooled life experimental device of the compressor to reproduce the liquid return operation. However, the relevant working condition debugging does not have a unified standard, whether liquid return occurs is not easy to judge, the operation is complex, the experimental period is long, and the compressor does not have the characteristics of quickly and accurately evaluating whether the overall liquid impact resistance of the compressor is obviously improved.

[0004] In view of the problems in the prior art, it is necessary to design a new low-pressure cavity scroll compressor liquid return impact experimental device to overcome the problems in the prior art. SUMMARY

[0005] The existing compressor liquid return test device provided in the prior art is complex, it is not easy to judge whether liquid return occurs, the experimental period is long, and the compressor does not have the technical problems of quickly and accurately evaluating the overall liquid impact resistance. A low-pressure cavity scroll compressor liquid return impact experimental device is provided.

[0006] The technical means adopted by the utility model are as follows:

[0007] A low-pressure cavity scroll compressor liquid impact experimental device comprises a gas-liquid separator, an electronic expansion valve, a liquid sight glass, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, an electronic expansion valve pipeline and a bypass pipeline.

[0008] Further, one end of the first stop valve is connected with the exhaust pipeline of the tested compressor, and the other end is connected with the inlet of the gas-liquid separator.

[0009] Further, the outlet of the gas-liquid separator is connected with the second stop valve.

[0010] Further, the second stop valve is connected with the electronic expansion valve through the electronic expansion valve pipeline.

[0011] Further, the electronic expansion valve pipeline has a bypass pipeline connected in parallel, and the bypass pipeline is provided with the third stop valve.

[0012] Further, the outlet of the electronic expansion valve is connected with the fourth stop valve.

[0013] Further, the fourth stop valve is connected with the liquid sight glass.

[0014] Further, the liquid sight glass is connected with the suction pipeline of the tested compressor.

[0015] Further, a temperature sensor is arranged at the upper cover of the tested compressor.

[0016] Further, only a high-pressure pressure sensor is arranged between the exhaust pipeline of the tested compressor and the first stop valve.

[0017] Further, a needle valve A of a refrigerant pre-reserved charging port is arranged on the front pipeline of the high-pressure pressure sensor.

[0018] Further, a filter is arranged at the front end of the electronic expansion valve.

[0019] Further, a low-pressure pressure sensor is arranged between the fourth stop valve and the liquid sight glass.

[0020] Further, a needle valve B of a refrigerant pre-reserved charging port is arranged on the front pipeline of the low-pressure pressure sensor.

[0021] The experimental process of the utility model is as follows:

[0022] The process of the liquid return impact experiment using the experimental device is briefly described as follows: the first stop valve and the fourth stop valve are closed in a vacuum state (the remaining valves are in a fully open state), the needle valve B is used to inject a proper amount of refrigerant into the system, after standing, the first stop valve and the fourth stop valve are opened, the electronic expansion valve is in a certain step opening, the third stop valve is closed, the compressor is started for a certain time, then the compressor is closed, after a certain interval, the compressor is started again, the interval is determined by the temperature and pressure values, the experiment is repeated, and the number of compressor operation times is recorded.

[0023] The above is one use mode of the device, and other use modes are not exemplified.

[0024] Compared with the prior art, the low-pressure cavity scroll compressor liquid return impact experiment device has the following advantages:

[0025] The low-pressure cavity scroll compressor liquid return impact experiment device provided by the utility model provides a judgment basis for verifying the reliability of the compressor against liquid impact, compared with other experiment devices, the application has the advantages of simple structure, short experiment period, high experiment effectiveness, good stability, and can simulate various liquid return operation conditions, and can be used as a standard experiment device for the design allowance of compressor parts.

[0026] In summary, the technical scheme of the utility model solves the problems in the prior art, such as the existing compressor test device being complex, difficult to judge whether liquid return occurs, long experiment period, and not having the function of quickly and accurately evaluating the overall liquid impact resistance of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is a system schematic diagram of the utility model.

[0029] In the figure: 10, the tested compressor 20, the gas-liquid separator 30, the electronic expansion valve 31, the filter 40, the liquid sight glass 51, the temperature sensor 52, the high-pressure pressure sensor 53, the needle valve A 54, the low-pressure pressure sensor 55, the needle valve B 61, the first stop valve 62, the second stop valve 63, the third stop valve 64, the fourth stop valve 621, the electronic expansion valve pipeline 631, the bypass pipeline DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely below in combination with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0032] It should be noted that the terms used herein are only for describing specific embodiments, not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or their combination.

[0033] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the utility model. At the same time, it should be clear that the size of each part shown in the drawings is not drawn in proportion to the actual proportion. The technology, method and equipment known to those skilled in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the utility model, it needs to understand that the orientation words such as " front, rear, upper, lower, left, right " " horizontal, vertical, perpendicular, horizontal " and " top, bottom " and the orientation or positional relationship indicated by the drawings are usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, under the circumstances without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the protection scope of the utility model: the orientation words " inner, outer " refer to the inner and outer of the contour of each component itself.

[0035] For the convenience of description, spatial relative terms such as " above ", " above ", " upper surface ", " upper " and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as " above " or " above " other devices or structures will be positioned " below " or " below " other devices or structures. Thus, the exemplary term " above " can include both " above " and " below " orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0036] In addition, it should be noted that the use of " first ", " second " and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it can not be understood as the limitation of the protection scope of the utility model.

[0037] As shown in Figure 1 The utility model provides a kind of low-pressure cavity scroll compressor liquid impact experimental device, it includes: gas-liquid separator 20, electronic expansion valve 30, liquid mirror 40, first stop valve 61, second stop valve 62, third stop valve 63, fourth stop valve 64, electronic expansion valve pipeline 621 and bypass pipeline 631;First stop valve 61 one end is connected with the exhaust line of the compressor 10 to be tested, the other end is connected with the inlet of gas-liquid separator 20;The outlet of gas-liquid separator 20 is connected with second stop valve 62;Second stop valve 62 is connected with electronic expansion valve 30 by electronic expansion valve pipeline 621;Electronic expansion valve pipeline 621 has bypass pipeline 631 in parallel, and third stop valve 63 is provided on bypass pipeline 631;Electronic expansion valve 30 outlet connects fourth stop valve 64;Fourth stop valve 64 connects liquid mirror 40;Liquid mirror 40 is connected with the suction line of the compressor 10 to be tested.

[0038] A temperature sensor 51 is arranged at the upper cover of the compressor 10 under test.

[0039] Only a high-pressure pressure sensor 52 is arranged between the exhaust pipeline of the compressor 10 under test and the first stop valve 61.

[0040] A needle valve A 53 of a refrigerant pre-reserve charging port is arranged on the pipeline in front of the high-pressure pressure sensor 52.

[0041] A filter 31 is arranged at the front end of the electronic expansion valve 30.

[0042] A low-pressure pressure sensor 54 is further arranged between the fourth stop valve 64 and the sight glass 40.

[0043] A needle valve B 55 of a refrigerant pre-reserve charging port is arranged on the pipeline in front of the low-pressure pressure sensor 54.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-pressure cavity scroll compressor back-liquid impact experimental device, characterized in that: the low-pressure cavity scroll compressor back-liquid impact experimental device comprises a gas-liquid separator (20), an electronic expansion valve (30), a visual liquid mirror (40), a first stop valve (61), a second stop valve (62), a third stop valve (63), a fourth stop valve (64), an electronic expansion valve pipeline (621), and a bypass pipeline (631); one end of the first stop valve (61) is connected with an exhaust pipeline of a tested compressor (10), and the other end is connected with an inlet of the gas-liquid separator (20); an outlet of the gas-liquid separator (20) is connected with the second stop valve (62); the second stop valve (62) is connected with the electronic expansion valve (30) through the electronic expansion valve pipeline (621); the electronic expansion valve pipeline (621) is connected with the bypass pipeline (631) in parallel, and the bypass pipeline (631) is provided with the third stop valve (63); an outlet of the electronic expansion valve (30) is connected with the fourth stop valve (64); the fourth stop valve (64) is connected with the visual liquid mirror (40); and the visual liquid mirror (40) is connected with a suction pipeline of the tested compressor (10).

2. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 1, characterized in that: a temperature sensor (51) is arranged at an upper cover of the tested compressor (10).

3. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 1, characterized in that: only a high-pressure pressure sensor (52) is arranged between an exhaust pipeline of the tested compressor (10) and the first stop valve (61).

4. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 3, characterized in that: a needle valve A (53) of a refrigerant pre-reserved charging port is arranged on a front pipeline of the high-pressure pressure sensor (52).

5. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 1, characterized in that: a filter (31) is arranged at a front end of the electronic expansion valve (30).

6. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 1, characterized in that: a low-pressure pressure sensor (54) is further arranged between the fourth stop valve (64) and the visual liquid mirror (40).

7. The low-pressure cavity scroll compressor back-liquid impact experimental device according to claim 6, characterized in that: a needle valve B (55) of a refrigerant pre-reserved charging port is arranged on a front pipeline of the low-pressure pressure sensor (54). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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