Oil return assembly and horizontal compressor

Abstract

The utility model provides an oil return assembly and a horizontal compressor, the oil return assembly comprises: a heat sleeve, the inner wall of which forms a pipeline; the spiral plug is arranged in the pipeline, the spiral plug is provided with a first end facing the oil inlet end of the pipeline and a second end facing the oil outlet end of the pipeline, threads are arranged on the periphery of the spiral plug, a thread groove is formed between the threads, and a thread oil way is defined by the thread groove and the inner wall of the heat sleeve; and the filter screen piece is arranged in the pipeline and connected to the first end of the screw plug, and the filter screen is arranged on the upstream of the threaded oil way. According to the utility model, the risk of aluminum scrap generation can be reduced, the function of filtering impurities is also considered, the oil return of the whole compressor is realized, and the operation reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of vehicle-mounted refrigeration equipment, and specifically to an oil return assembly and a horizontal compressor. Background Art

[0002] Due to the characteristics of compact structure and small volume of vehicle-mounted scroll compressors, and generally designed with a horizontal structure, the oil storage capacity of lubricating oil inside the compressor is insufficient. To meet the characteristics of low noise, low vibration and high life of the compressor, oil return of the compressor is particularly important. Based on the high-pressure characteristics of CO2 refrigerant, the requirement for low leakage is higher. The oil return screw plug is realized by interference press-fitting. If a material with low hardness (such as PA66) is used, press-fitting deformation will occur and processing is difficult. If a material with high hardness (such as 1215) is used, aluminum chips will be pressed out.

[0003] Patent CN105452664A discloses a spiral oil return mechanism, which performs high-pressure throttling through a spiral oil path formed by the cooperation of a spiral rod-shaped component and an oil return channel. The spiral throttling oil path utilizes both the axial and circumferential spaces, and greatly creates a throttling oil path with sufficient throttling capacity in a limited space. The rod-shaped oil return mechanism with a spiral in Patent CN105452664A has a significant improvement in space utilization. However, when dealing with higher requirements for throttling capacity, the number of turns of the spiral increases, resulting in a higher probability of extruding impurities at the assembly part when pressing the oil return device. The accumulation of impurities in the oil path will cause the oil path to be blocked, and when entering the rotating parts, it will damage the operation of the compressor, increasing the failure risk of the compressor.

[0004] In view of this, the utility model provides an oil return assembly and a horizontal compressor. Summary of the Utility Model

[0005] Aiming at the problems in the prior art, the oil return assembly and the horizontal compressor of the utility model overcome the difficulties of the prior art, can reduce the risk of aluminum chip generation, and also take into account the function of filtering impurities, realize the oil return of the whole compressor, and improve the operation reliability.

[0006] An embodiment of the utility model provides an oil return assembly, including:

[0007] A thermal sleeve, the inner wall of the thermal sleeve forms a pipe;

[0008] A screw plug is arranged in the pipe. The screw plug has a first end facing the oil inlet end of the pipe and a second end facing the oil outlet end. Threads are provided on the outer periphery of the screw plug, and thread grooves are formed between the threads. The thread grooves and the inner wall of the thermal sleeve enclose a threaded oil path;

[0009] A filter element is disposed within the pipeline, connected to the first end of the screw plug, and the filter is disposed upstream of the threaded oil passage.

[0010] Preferably, an outwardly expanding guiding groove is provided on the end face of the first end of the screw plug, the outwardly expanding guiding groove is disposed between the filter and the threaded oil passage, and the threaded oil passage and the outwardly expanding guiding groove form a combined oil return passage.

[0011] Preferably, the filter element has an end face oil inlet filtering portion facing the oil inlet end and a positioning ring facing the oil outlet end, the diameter of the positioning ring is larger than the diameter of the end face oil inlet filtering portion, an inwardly shrinking side net portion is formed by inward shrinkage between the positioning ring and the end face oil inlet filtering portion, and an annular oil inlet filtering portion is formed between the inwardly shrinking side net portion and the heat sleeve.

[0012] Preferably, an oil inlet cavity is formed between the inner wall of the filter and the first end of the screw plug.

[0013] Preferably, the positioning ring is sleeved within the heat sleeve, and the positioning ring abuts against the first end of the screw plug.

[0014] Preferably, a cylindrical portion is provided at the second end of the screw plug, which is exposed outside the oil outlet end of the pipeline.

[0015] Preferably, the heat sleeve is heat-shrunk onto the outer periphery of the screw plug.

[0016] Preferably, the outwardly expanding guiding groove is a cross groove, and the edges of the cross groove are respectively communicated with the threaded oil passages on the outer periphery of the screw plug.

[0017] An embodiment of the present invention further provides a horizontal compressor, characterized in that it includes the above-mentioned oil return assembly, the compressor is provided with an oil return pipeline, and the oil return assembly is disposed within the oil return pipeline.

[0018] Preferably, the oil return assembly is press-fitted into the oil return pipeline with interference fit, an oil inlet pipeline communicating with the oil inlet end of the pipeline is provided at the bottom of the oil storage tank of the compressor, and an oil outlet passage is formed by the gap between the oil outlet end of the pipeline and the compressor housing.

[0019] The oil return assembly and the horizontal compressor of the present invention can reduce the risk of aluminum chip generation, and at the same time take into account the function of filtering impurities, realize the oil return of the whole compressor, and improve the operation reliability. Description of the Drawings

[0020] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious.

[0021] Figure 1It is a sectional view of the oil return assembly of the present utility model.

[0022] Figure 2 It is a three-dimensional view of the screw plug in the oil return assembly of the present utility model.

[0023] Figure 3 It is a side view of the screw plug in the oil return assembly of the present utility model.

[0024] Figure 4 It is a three-dimensional view of the filter element in the oil return assembly of the present utility model.

[0025] Figures 5 to 7 It is a schematic diagram of the assembly process of the oil return assembly of the present utility model.

[0026] Figure 8 It is a partial sectional view of the horizontal compressor of the oil return assembly of the present utility model.

[0027] Figure 9 It is Figure 8 An enlarged view of area C in

[0028] Reference numerals

[0029] 1 Compressor

[0030] 11 Oil storage tank

[0031] 12 Oil inlet pipeline

[0032] 13 Oil outlet channel

[0033] 14 Compressor housing

[0034] 2 Filter element

[0035] 21 End face oil inlet filtering part

[0036] 22 Inner retracted side net part

[0037] 23 Positioning ring

[0038] 24 Oil inlet cavity

[0039] 3 Screw plug

[0040] 31 Threaded oil passage

[0041] 32 Threaded groove

[0042] 33 Thread

[0043] 34 Outer expanded guiding groove

[0044] 35 Cylindrical part

[0045] 4 Thermal sleeve

[0046] 5 Assembly tool Detailed implementation manners

[0047] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation manners. Various details in the present application can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0048] The following takes the accompanying drawings as a reference and details the embodiments of the present application so that those skilled in the technical field to which the present application belongs can easily implement it. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0049] In the description of the present application, the reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples.

[0050] In addition, the terms "first" and "second" are only used for illustrative purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0051] In order to clearly illustrate the present application, devices irrelevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0052] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed therebetween. In addition, when it is said that a certain device "includes" a certain component, unless there is a particularly contrary record, it does not exclude other components, but means that other components can also be included.

[0053] When it is said that a device is "above" another device, this can be directly above the other device, but there can also be other devices in between. When it is said, in contrast, that a device is "directly" "above" another device, there are no other devices in between.

[0054] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to also include the plural forms unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition only occurs when the combination of elements, functions, steps, or operations are mutually exclusive in some manner.

[0055] The technical terms used herein are only for referring to specific embodiments and are not intended to limit the present application. The singular forms used herein also include the plural forms as long as the statements do not clearly indicate the contrary meaning. The meaning of "including" used in the specification is to embody specific characteristics, regions, integers, steps, operations, elements, and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0056] Although not defined differently, including the technical terms and scientific terms used herein, all terms have the same meaning as generally understood by those skilled in the technical field to which the present application pertains. Terms defined in commonly used dictionaries are additionally interpreted to have a meaning consistent with the relevant technical literature and the content currently presented. As long as they are not defined, they should not be over-interpreted as ideal or overly formulaic meanings.

[0057] Figure 1 is a sectional view of the oil return assembly of the present utility model. Figure 2 is a perspective view of the screw plug in the oil return assembly of the present utility model. Figure 3 is a side view of the screw plug in the oil return assembly of the present utility model. Figure 4 is a perspective view of the filter element in the oil return assembly of the present utility model. As Figures 1 to 4As shown in the figure, a kind of oil return assembly of the utility model includes: a filter element 2, a screw plug 3 and a heat sleeve 4. Among them, the inner wall of the heat sleeve 4 forms a pipeline. The screw plug 3 is arranged in the pipeline. The screw plug 3 has a first end facing the oil inlet end of the pipeline and a second end facing the oil outlet end. Threads 33 are arranged on the outer periphery of the screw plug 3, and thread grooves 32 are formed between the threads 33. The thread grooves 32 and the inner wall of the heat sleeve 4 enclose a threaded oil passage 31. The filter element 2 is arranged in the pipeline and connected to the first end of the screw plug 3. The filter element 2 is arranged upstream of the threaded oil passage 31.

[0058] In a preferred embodiment, an outwardly expanding guiding groove 34 is arranged on the end face of the first end of the screw plug 3. The outwardly expanding guiding groove 34 is arranged between the filter element 2 and the threaded oil passage 31. The threaded oil passage 31 and the outwardly expanding guiding groove 34 form a combined oil return channel, but it is not limited thereto.

[0059] In a preferred embodiment, the filter element 2 has an end face oil inlet filtering part 21 facing the oil inlet end and a positioning ring 23 facing the oil outlet end. The diameter of the positioning ring 23 is larger than that of the end face oil inlet filtering part 21. An inwardly shrinking side net part 22 is formed by inward shrinkage between the positioning ring 23 and the end face oil inlet filtering part 21. An annular oil inlet filtering part is formed between the inwardly shrinking side net part 22 and the heat sleeve 4, but it is not limited thereto.

[0060] In a preferred embodiment, an oil inlet cavity 24 is formed between the inner wall of the filter element 2 and the first end of the screw plug 3, but it is not limited thereto.

[0061] In a preferred embodiment, the positioning ring 23 is sleeved in the heat sleeve 4, and the positioning ring 23 abuts against the first end of the screw plug 3, but it is not limited thereto.

[0062] In a preferred embodiment, a columnar part 35 is arranged at the second end of the screw plug 3 and exposed outside the oil outlet end of the pipeline, but it is not limited thereto.

[0063] In a preferred embodiment, the heat sleeve 4 is heat-sleeved on the outer periphery of the screw plug 3, but it is not limited thereto.

[0064] In a preferred embodiment, the outwardly expanding guiding groove 34 is a cross groove, and the edges of the cross groove are respectively communicated with the threaded oil passage 31 on the outer periphery of the screw plug 3, but it is not limited thereto.

[0065] The integrated oil return mechanism of the utility model is composed of a screw plug, a heat sleeve and a filter. To ensure smooth oil return, a cross groove is machined on the top surface of the screw plug. In the utility model, the material of the screw plug is metal or plastic; the material of the heat sleeve is metal, preferably aluminum alloy; the material of the filter is metal, preferably stainless steel, but it is not limited thereto.

[0066] Based on the high-pressure characteristics of CO2 refrigerant, a spiral oil return mechanism is selected in the limited space of the compressor oil circuit. Since spiral oil return involves machining spiral grooves on the cylindrical surface, sharp edges are likely to be generated on its surface, and burrs are easily produced during the press-fitting process, blocking the oil circuit. Therefore, to avoid the generation of aluminum chips during pressing, this utility model solves the problem through the method of heat-sleeving a spiral plug with a heat sleeve and then press-fitting it with interference. By using the fact that the heat sleeve and the housing have a complete cylindrical surface contact with the mating hole, the risk of impurity generation is reduced. At the same time, by borrowing the aluminum ring structure, the filter screen is pressed onto the aluminum ring together, which serves the purpose of filtering impurities at the same time, making the oil return not easily blocked and ensuring the smoothness of the oil circuit.

[0067] Continue to refer to Figures 1 to 4 , the specific implementation manner of this utility model is as follows:

[0068] In a kind of oil return assembly of this utility model, an inner wall of a heat sleeve 4 forms a pipeline. A spiral plug 3 is arranged in the pipeline. The spiral plug 3 has a first end facing the oil inlet end of the pipeline and a second end facing the oil outlet end. An outer periphery of the spiral plug 3 is provided with threads 33, and thread grooves 32 are formed between the threads 33. The thread grooves 32 and the inner wall of the heat sleeve 4 enclose a threaded oil circuit 31. A filter screen member 2 is arranged in the pipeline and is connected to the first end of the spiral plug 3. The filter screen member 2 is arranged upstream of the threaded oil circuit 31. An end face of the first end of the spiral plug 3 is provided with an outward-expanding guiding groove 34. The outward-expanding guiding groove 34 is arranged between the filter screen member 2 and the threaded oil circuit 31. The threaded oil circuit 31 and the outward-expanding guiding groove 34 form a combined oil return channel. The filter screen member 2 has an end face oil inlet filtering part 21 facing the oil inlet end and a positioning ring 23 facing the oil outlet end. An inner retracted side net part 22 is formed by inner retraction between the positioning ring 23 and the end face oil inlet filtering part 21. An annular oil inlet filtering part is formed between the inner retracted side net part 22 and the heat sleeve 4, further increasing the oil inlet volume. An oil inlet cavity 24 is formed between an inner wall of the filter screen member 2 and the first end of the spiral plug 3. The positioning ring 23 is sleeved in the heat sleeve 4, and the positioning ring 23 abuts against the first end of the spiral plug 3. A columnar part 35 is provided at the second end of the spiral plug 3 and is exposed outside the oil outlet end of the pipeline. The heat sleeve 4 is heat-sleeved on the outer periphery of the spiral plug 3. The outward-expanding guiding groove 34 is a cross groove, and four edges of the cross groove are respectively communicated with the threaded oil circuit 31 on the outer periphery of the spiral plug 3, forming four vertically bent flow channels. A first flow direction of the high-pressure oil guided by the outward-expanding guiding groove 34 is perpendicular to a second flow direction of the high-pressure oil guided by the threaded oil circuit 31, realizing a three-dimensional combined oil return channel with multiple sub-flow channels, which is beneficial to increasing the flow rate. The integrated oil return mechanism of this utility model is composed of a spiral plug 3, a heat sleeve 4, and a filter screen member 2, and its oil return direction is as Figure 1 shown. The material of the spiral plug 3 is metal or plastic, the material of the heat sleeve 4 is aluminum alloy, and the material of the filter screen member 2 is stainless steel. As Figure 2As shown, the main element of the screw plug 3 is a columnar component, and spiral grooves 32 are machined on its cylindrical surface. The cross-sectional shape of the grooves can be rectangular, V-shaped or semi-circular. The axial grooves are chamfered near the ends, so that a complete oil passage is formed on the surface of the entire oil return device. Since the filter element 2 will block part of the oil return passage after being pressed in, a cross groove is machined on the top surface of the screw plug to ensure smooth oil return. The connection between the end face and the cylindrical surface of the screw plug is chamfered. To prevent the direct connection between the inlet and outlet oil passages, there is a sufficient safety distance in the axial direction between the inlet and outlet oil passages, and the safety distance should be greater than 1 times the groove width.

[0069] Figures 5 to 7 is a schematic diagram of the assembly process of the oil return assembly of the present utility model. As Figures 5 to 7 shown, the assembly process of the integrated oil return mechanism of the present utility model is as follows:

[0070] The first step: Refer to Figure 5 , and use the assembly tooling 5 to position the screw plug 3.

[0071] The second step: Refer to Figure 6 , heat the heat sleeve 4, and then use the assembly tooling 5 to thermally sleeve the heat sleeve 4 on the screw plug 3 to ensure that the end face of the heat sleeve 4 is in contact with the end face of the assembly tooling 5.

[0072] The third step: Refer to Figure 7 , press in the filter element 2 to ensure that the end face of the filter element 2 is in contact with the end face of the screw plug 3.

[0073] Figure 8 is a partial cross-sectional view of a horizontal compressor of the oil return assembly of the present utility model. Figure 9 is Figure 8 The enlarged view of area C in Figure 8 and 9 shown, a horizontal compressor of the present utility model includes the above-mentioned oil return assembly, and the compressor is provided with an oil return pipeline, and the oil return assembly is arranged in the oil return pipeline.

[0074] In a preferred embodiment, the oil return assembly is pressed into the oil return pipeline by interference fit, and an oil inlet pipeline 12 connected to the oil inlet end of the pipeline is provided at the bottom of the oil storage tank 11 of the compressor, and the gap between the oil outlet end of the pipeline and the compressor housing 14 forms an oil outlet channel 13, but it is not limited thereto. Since the thermal sleeve 4 in the oil return assembly is a tubular structure, it is not easy to deform during the interference fit process, and it is also less likely to produce aluminum chips pressed out. Moreover, since the thermal sleeve 4 isolates the oil return pipeline and the combined oil return channel (threaded oil channel 31 + outward expansion guide groove 34), even if aluminum chips are generated between the thermal sleeve 4 and the oil return pipeline, they will not be flushed into the combined oil return channel, especially the aluminum chips can be prevented from entering the threaded oil channel 31, thereby effectively preventing the risk of impurities accumulating in the oil channel in the prior art, which will cause the oil channel to be blocked, and the risk of damaging the operation of the compressor when entering the operating parts, thereby reducing the risk of failure of the compressor.

[0075] Continue to refer Figure 8 and 9 , the oil return mechanism body of the utility model and the oil return oil circuit formed by cooperation with the compressor housing. When the compressor is running, the lubricating oil inside the compressor moves from the suction side to the exhaust side along with the refrigerant, and the high-pressure oil on the exhaust side is introduced into the integrated oil return mechanism through the oil inlet channel. The high-pressure oil enters the oil inlet chamber 24 after being filtered from the end face oil inlet filter portion 21 and the annular oil inlet filter portion of the filter element 2, and then flows from the outward expansion guide groove 34 to the threaded oil circuit 31 on the outer periphery of the spiral plug 3, and spirally moves along the threaded oil circuit 31 until it flows out from the oil outlet end of the pipeline. Finally, the high-pressure oil moves to the position in the compressor that needs lubrication after throttling and reducing the pressure along the channel formed by the oil return mechanism and the inner wall of the compressor housing 14, and then enters the compression chamber again along the refrigerant to start the next cycle.

[0076] The utility model provides an integrated oil return mechanism in a limited axial space. Impurities are not easily generated during the assembly process, and the reliability is higher; moreover, the shrink sleeve is matched with the spiral groove structure, and the refrigerant leakage is small, which is suitable for high-pressure differential refrigerants.

[0077] In summary, the oil return assembly and the horizontal compressor of the utility model can reduce the risk of aluminum chips generation, and also take into account the function of filtering impurities, thereby realizing the oil return of the entire compressor and improving the reliability of operation.

[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An oil return assembly, characterized in that: include: A thermal sleeve (4), the inner wall of which forms a pipe; a screw plug (3) disposed in the pipeline, the screw plug (3) having a first end facing the oil inlet end of the pipeline and a second end facing the oil outlet end, a screw thread (33) being disposed on the outer periphery of the screw plug (3), a screw thread groove (32) being formed between the screw threads (33), and the screw thread groove (32) and the inner wall of the thermal sleeve (4) forming a screw thread oil passage (31); A filter element (2) is arranged in the pipeline and connected to the first end of the screw plug (3). The filter element (2) is arranged upstream of the threaded oil passage (31).

2. The oil return assembly according to claim 1, characterized in that: An outwardly expanding guide groove (34) is provided on the end surface of the first end of the screw plug (3); the outwardly expanding guide groove (34) is arranged between the filter element (2) and the threaded oil passage (31); the threaded oil passage (31) and the outwardly expanding guide groove (34) form a combined oil return passage.

3. The oil return assembly according to claim 2, characterized in that: The filter element (2) comprises an end face oil inlet filter portion (21) facing the oil inlet end and a positioning ring (23) facing the oil outlet end, the positioning ring (23) and the end face oil inlet filter portion (21) are indented to form an indented side mesh portion (22), and an annular oil inlet filter portion is formed between the indented side mesh portion (22) and the thermal sleeve (4).

4. The oil return assembly according to claim 3, characterized in that: An oil inlet chamber (24) is formed between the inner wall of the filter element (2) and the first end of the screw plug (3).

5. The oil return assembly according to claim 3, characterized in that: The positioning ring (23) is sleeved in the thermal sleeve (4), and the positioning ring (23) abuts against the first end of the screw plug (3).

6. The oil return assembly according to claim 1, characterized in that: The second end of the screw plug (3) is provided with a column portion (35) exposed at the oil outlet end of the pipeline.

7. The oil return assembly according to claim 1, characterized in that: The thermal sleeve (4) is thermally sleeved on the outer circumference of the screw plug (3).

8. The oil return assembly according to claim 2, characterized in that: The outwardly expanded guide groove (34) is a cross groove, and the edges of the cross groove are respectively connected to the threaded oil path (31) on the outer periphery of the screw plug (3).

9. A horizontal compressor, characterized in that: It comprises the oil return assembly as claimed in claim 1, wherein the compressor is provided with an oil return pipeline, and the oil return assembly is arranged in the oil return pipeline.

10. The horizontal compressor according to claim 9, characterized in that: The oil return assembly is pressed into the oil return pipeline by interference fit, and an oil inlet pipeline (12) connected to the oil inlet end of the pipeline is provided at the bottom of the oil storage tank (11) of the compressor, and the gap between the oil outlet end of the pipeline and the compressor housing (14) forms an oil outlet channel (13).

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