A lower case structure for improving reliability of a compressor

Abstract

A lower casing structure for improving compressor reliability includes a compressor and a lower casing. An annular oil guide groove is connected to the bottom of the inner wall of the lower casing. An oil storage tank is connected to the center of the annular oil guide groove. An annular oil guide groove outlet is provided on the inner wall surface near the oil storage tank, and an oil inlet is provided on the outer wall surface away from the oil storage tank. The compressor includes a core, an oil pump, and a motor rotor. The oil storage tank has an oil inlet and an oil outlet. The core is connected to the oil pump, and the oil pump is connected to an oil sump. The axis of the oil storage tank is vertical and intersects the lowest point of the inner wall of the lower casing. This invention improves the cooling effect of the refrigerant oil by adding an annular oil guide groove to the bottom of the inner wall of the compressor's lower casing, allowing the refrigerant oil to mix thoroughly within the groove and reducing the temperature of the refrigerant oil drawn in by the oil pump. The addition of an oil storage tank below the oil pump increases the oil level in the tank, improving the working environment of the oil pump during compressor operation.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a lower casing structure for improving compressor reliability. Background Technology

[0002] Small reciprocating piston compressors are commonly used in household appliances such as refrigerators and freezers, requiring long-term continuous operation and frequent starts, thus placing certain demands on compressor reliability and heat dissipation. During compressor operation, the internal temperature of the casing is high. The primary cooling method involves delivering refrigerant oil to the friction pairs and the inner surface of the casing for cooling, and finally dissipating heat through the casing surface. After being pumped to the upper part of the compressor core and casing by the oil pump, the refrigerant oil flows back to the oil sump at the bottom of the casing by gravity, carrying the absorbed heat into the sump. Optimizing the casing design can effectively reduce the oil sump temperature, improve the cooling effect of the refrigerant oil, and thus improve the reliability of the compressor. A common method is to add a baffle plate to the lower casing, but the effect of a simple baffle plate structure is limited. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a lower shell structure that improves the reliability of the compressor, solves the problem that the cooling effect of the refrigeration oil is limited after the compressor has been running for a long time and the shell surface has reached thermal equilibrium, and solves the problem that the uneven temperature of the oil sump inside the compressor causes the oil pump to draw in high-temperature refrigeration oil and the cooling effect is poor.

[0004] The technical solution adopted by this invention to solve its technical problem is: a lower housing structure for improving the reliability of a compressor, comprising a compressor and a lower housing, wherein an annular oil guide groove is connected to the bottom of the inner wall of the lower housing, an oil storage tank is connected to the center of the annular oil guide groove, an annular oil guide groove outlet hole is provided on the inner wall surface of the annular oil guide groove near the oil storage tank, an annular oil guide groove inlet hole is provided on the outer wall surface of the annular oil guide groove away from the oil storage tank, guide rings are respectively connected to the outer wall and the inner wall, the oil storage tank is provided with an oil storage tank inlet hole and an oil storage tank outlet hole, the compressor comprises a core, an oil pump and a motor rotor, the core is connected to the oil pump, the oil pump is connected to an oil sump, and the axis of the oil storage tank is vertical and intersects with the lowest point of the inner wall of the lower housing.

[0005] As a further improvement of the present invention, the oil storage tank is a circular hollow cylinder.

[0006] As a further improvement of the present invention: the annular oil guide groove is composed of one-way valves connected end to end.

[0007] As a further improvement of the present invention: the distance between the top plane of the annular oil guide groove and the bottom of the inner wall of the lower shell is greater than or equal to 14 mm and less than or equal to 18 mm.

[0008] As a further improvement of the present invention: the oil inlet and oil outlet of the oil storage tank are located at the contact end between the wall of the oil storage tank and the inner wall of the lower shell.

[0009] As a further improvement of the present invention: the cross-sectional area of ​​the oil inlet hole and the oil outlet hole of the annular oil guide groove are the same.

[0010] As a further improvement of the present invention: the cross-sectional area of ​​the oil inlet hole and the oil outlet hole of the annular oil guide groove is greater than or equal to 3 mm² and less than or equal to 10 mm².

[0011] As a further improvement of the present invention: the distance between the top surface of the oil storage tank and the lowest point of the inner wall of the lower shell is greater than or equal to 6 mm and less than or equal to 17 mm.

[0012] As a further improvement of the present invention, the inner diameter of the oil storage tank is larger than the diameter of the oil pump.

[0013] As a further improvement of the present invention, the outer wall diameter of the oil storage tank is 60mm-85mm.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention adds an annular oil guide groove to the bottom of the inner wall of the compressor's lower casing, allowing the refrigerant oil to mix thoroughly within the groove and resulting in a more uniform heat and cold distribution within the oil sump. This reduces the temperature of the refrigerant oil drawn in by the oil pump, thereby improving the cooling effect of the refrigerant oil.

[0016] 2. This invention improves the working environment of the oil pump by adding an oil storage tank below the oil pump, thereby increasing the oil level in the tank. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the working of the annular oil guide groove of the present invention;

[0019] Figure 3 This is a schematic diagram showing the height of the annular oil guide groove of the present invention;

[0020] Figure 4 This is a schematic diagram of the cross-section of the oil inlet and outlet holes on the annular oil guide groove of the present invention;

[0021] Figure 5 This is a cross-sectional view of the entire machine of the present invention;

[0022] In the diagram: 1. Lower shell; 2. Annular oil guide groove; 3. Oil storage tank; 4. Oil outlet of the annular oil guide groove; 5. Oil inlet of the annular oil guide groove; 6. Guide ring; 7. Outer wall; 8. Inner wall; 9. Oil inlet of the oil storage tank; 10. Oil outlet of the oil storage tank; 11. Oil pump; 12. Oil sump. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and embodiments: such as Figure 1-5 The diagram illustrates a lower housing structure for improving compressor reliability, comprising a compressor and a lower housing 1. An annular oil guide groove 2 is connected to the bottom of the inner wall of the lower housing 1. An oil storage tank 3 is connected to the center of the annular oil guide groove 2. An annular oil guide groove outlet hole 4 is provided on the inner wall 7 of the annular oil guide groove 2 near the oil storage tank 3. An annular oil guide groove inlet hole 5 is provided on the outer wall 8 of the annular oil guide groove 2 away from the oil storage tank 3. A guide ring 6 is connected to the outer wall 7 and inner wall 8 of the annular oil guide groove. The oil storage tank 3 has an oil storage tank inlet hole 9 and an oil storage tank outlet hole 10. The compressor includes a core, an oil pump 11, and a motor rotor. The core is connected to the oil pump 11, and the oil pump 11 is connected to an oil sump 12. The axis of the oil storage tank 3 is vertical and intersects with the lowest point of the inner wall of the lower housing.

[0027] In a preferred embodiment, the oil storage tank 3 is a circular hollow cylinder.

[0028] In a preferred embodiment, the annular oil guide groove 2 is composed of one-way valves connected end to end.

[0029] In a preferred embodiment, the distance between the top plane of the annular oil guide groove 2 and the bottom of the inner wall of the lower shell 1 is greater than or equal to 14 mm and less than or equal to 18 mm.

[0030] In a preferred embodiment, the oil inlet hole 9 and the oil outlet hole 10 of the oil storage tank are located at the contact end between the wall of the oil storage tank 3 and the inner wall of the lower shell 1.

[0031] In a preferred embodiment, the cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is the same.

[0032] In a preferred embodiment, the cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is greater than or equal to 3 mm² and less than or equal to 10 mm².

[0033] In a preferred embodiment, the distance between the top surface of the oil storage tank 3 and the lowest point of the inner wall of the lower shell 1 is greater than or equal to 6 mm and less than or equal to 17 mm.

[0034] In a preferred embodiment, the inner diameter of the oil storage tank 3 is larger than the diameter of the oil pump 11.

[0035] In a preferred embodiment, the outer wall diameter of the oil storage tank 3 is 60mm-85mm.

[0036] Working principle of the invention:

[0037] This invention adds an annular oil guide groove to the bottom of the inner wall of the compressor's lower casing, allowing the refrigerant oil to mix thoroughly within the groove and resulting in a more uniform heat and cold distribution within the oil sump. This reduces the temperature of the refrigerant oil drawn into the oil pump, thereby improving the cooling effect of the refrigerant oil. Furthermore, by adding an oil reservoir below the oil pump, this invention increases the oil level within the reservoir, improving the working environment of the oil pump during compressor operation.

[0038] Implementation Case 1:

[0039] like Figure 1-5The diagram illustrates a lower housing structure for improving compressor reliability, comprising a compressor and a lower housing 1. An annular oil guide groove 2 is connected to the bottom of the inner wall of the lower housing 1. An oil storage tank 3 is connected to the center of the annular oil guide groove 2. An annular oil guide groove outlet hole 4 is provided on the inner wall 7 of the annular oil guide groove 2 near the oil storage tank 3. An annular oil guide groove inlet hole 5 is provided on the outer wall 8 of the annular oil guide groove 2 away from the oil storage tank 3. A guide ring 6 is connected to the outer wall 7 and inner wall 8 of the annular oil guide groove. The oil storage tank 3 has an oil storage tank inlet hole 9 and an oil storage tank outlet hole 10. The compressor includes a core, an oil pump 11, and a motor rotor. The core is connected to the oil pump 11, and the oil pump 11 is connected to an oil sump 12. The axis of the oil storage tank 3 is vertical and intersects with the lowest point of the inner wall of the lower housing.

[0040] The oil storage tank 3 is a circular hollow cylinder. The annular oil guide groove 2 is composed of one-way valves connected end to end. The distance between the top plane of the annular oil guide groove 2 and the bottom of the inner wall of the lower shell 1 is greater than or equal to 14 mm and less than or equal to 18 mm. The oil inlet hole 9 and the oil outlet hole 10 of the oil storage tank are located at the contact end between the wall of the oil storage tank 3 and the inner wall of the lower shell 1. The cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is the same. The cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is greater than or equal to 3 mm² and less than or equal to 10 mm². The distance between the top surface of the oil storage tank 3 and the lowest point of the inner wall of the lower shell 1 is greater than or equal to 6 mm and less than or equal to 17 mm. The inner wall diameter of the oil storage tank 3 is greater than the diameter of the oil pump 11. The outer wall diameter of the oil storage tank 3 is 60 mm to 85 mm.

[0041] In this embodiment, an annular oil guide groove 2 and an oil reservoir 3 are added to the conventional lower casing 1 of the piston compressor. By cooling the refrigerant oil by flowing in the annular oil guide groove 2 and raising the oil level in the oil reservoir 3 when the oil volume is low, the requirements for improving the cooling capacity of the refrigerant oil and improving the reliability of the compressor are met.

[0042] During operation of a conventional hermetic reciprocating compressor, the piston reciprocates at high speed within the cylinder bore, generating a significant amount of heat through friction. Simultaneously, the refrigerant is rapidly compressed within the cylinder bore, and the work done by the motor on the piston is converted into the internal energy of the refrigerant within the cylinder. The combination of these two factors results in compressor exhaust temperatures that can reach over 100°C. The internal operating conditions of the compressor are quite harsh, necessitating stringent cooling requirements.

[0043] The primary cooling method for piston compressors is convective heat transfer between the casing surface and the air. In addition to lubrication, the refrigerant oil also carries away heat generated by friction pairs such as the cylinder bores, thus cooling the compressor core.

[0044] After cooling the mechanism, the refrigerant oil eventually flows back to the oil sump 12 in the lower casing due to gravity, and is then drawn back into the oil pump 11, completing one flow cycle. The refrigerant oil is relatively hot after cooling the mechanism; if it is rapidly drawn into the oil sump 12 by the oil pump 11, its cooling capacity will deteriorate. Furthermore, some refrigerant oil is pumped onto the inner wall of the casing and flows back to the oil sump 12. At this point, the refrigerant oil has absorbed heat from the mechanism and the inner wall of the casing, resulting in an even higher temperature and requiring a longer cooling time.

[0045] Therefore, an annular oil guide groove 2 is added inside the lower casing 1, mainly responsible for cooling the high-temperature refrigerant oil flowing through the casing back to the oil sump 12. The compressor's oil pump 11 continuously draws in refrigerant oil, causing the refrigerant oil in the oil sump 12 to continuously flow from the edge to the center. The refrigerant oil flows into the annular oil guide groove 2 through the oil inlet hole 5 and then flows out through the oil outlet hole 4. The annular oil guide groove 2 is composed of a series of one-way valves. A protrusion on the outer wall 7 or inner wall 8 and a guide ring 6 surrounded by the protrusion form a one-way valve. The characteristic of this structure is that the fluid flowing in it can accelerate the fluid flowing in the direction pointed by the tip of the guide ring 6, while blocking the fluid flowing in the opposite direction. Therefore, the refrigerant oil is changed in direction by the guide ring in the annular oil guide groove and flows counterclockwise along the oil groove.

[0046] Implementation Case 2:

[0047] like Figure 1-5 The diagram illustrates a lower housing structure for improving compressor reliability, comprising a compressor and a lower housing 1. An annular oil guide groove 2 is connected to the bottom of the inner wall of the lower housing 1. An oil storage tank 3 is connected to the center of the annular oil guide groove 2. An annular oil guide groove outlet hole 4 is provided on the inner wall 7 of the annular oil guide groove 2 near the oil storage tank 3. An annular oil guide groove inlet hole 5 is provided on the outer wall 8 of the annular oil guide groove 2 away from the oil storage tank 3. A guide ring 6 is connected to the outer wall 7 and inner wall 8 of the annular oil guide groove. The oil storage tank 3 has an oil storage tank inlet hole 9 and an oil storage tank outlet hole 10. The compressor includes a core, an oil pump 11, and a motor rotor. The core is connected to the oil pump 11, and the oil pump 11 is connected to an oil sump 12. The axis of the oil storage tank 3 is vertical and intersects with the lowest point of the inner wall of the lower housing.

[0048] The oil storage tank 3 is a circular hollow cylinder. The annular oil guide groove 2 is composed of one-way valves connected end to end. The distance between the top plane of the annular oil guide groove 2 and the bottom of the inner wall of the lower shell 1 is greater than or equal to 14 mm and less than or equal to 18 mm. The oil inlet hole 9 and the oil outlet hole 10 of the oil storage tank are located at the contact end between the wall of the oil storage tank 3 and the inner wall of the lower shell 1. The cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is the same. The cross-sectional area of ​​the annular oil guide groove inlet hole 5 and the annular oil guide groove outlet hole 4 is greater than or equal to 3 mm² and less than or equal to 10 mm². The distance between the top surface of the oil storage tank 3 and the lowest point of the inner wall of the lower shell 1 is greater than or equal to 6 mm and less than or equal to 17 mm. The inner wall diameter of the oil storage tank 3 is greater than the diameter of the oil pump 11. The outer wall diameter of the oil storage tank 3 is 60 mm to 85 mm.

[0049] When the refrigeration oil flows within the annular oil guide groove 2, due to the presence of the one-way valve, the refrigeration oil flows counterclockwise in a unidirectional direction, and then flows out of the annular oil guide groove 2 through the oil outlet 4. During the flow process within the annular oil guide groove 2, the refrigeration oil is essentially forced to flow along the annular groove, prolonging the flow time within the oil sump 12. Simultaneously, the high-temperature refrigeration oil undergoes convective heat exchange with the wall of the annular oil guide groove 2 within the annular groove. The heat is conducted to the shell surface by the annular groove, and then carried away by the air outside the shell, thus completing heat dissipation.

[0050] The oil reservoir 3, located below the oil pump 11, serves two purposes: first, to separate debris from the oil sump 12, preventing it from entering the oil circuit and damaging the pump body; and second, to prevent the high-temperature refrigerant oil at the top of the oil sump 12 from being drawn into the oil pump 11. Since the density of the high-temperature refrigerant oil is slightly lower than that of the relatively cooler refrigerant oil in the oil sump 12, the temperature at the top of the oil sump 12 is higher than the temperature of the portion of the oil sump 12 closer to the casing. The height of the oil reservoir 3, exceeding the liquid level in the oil sump 12, effectively isolates the high-temperature refrigerant oil at the top of the oil sump 12. At this time, the oil pump 11 draws in the low-temperature refrigerant oil flowing into the oil reservoir 3 through the oil inlet 9 at the bottom, resulting in higher viscosity and better cooling. This improves the reliability of the compressor.

[0051] The main functions of this invention are:

[0052] This invention adds an annular oil guide groove to the bottom of the inner wall of the compressor's lower casing, allowing the refrigerant oil to mix thoroughly within the groove and resulting in a more uniform heat and cold distribution within the oil sump. This reduces the temperature of the refrigerant oil drawn into the oil pump, thereby improving the cooling effect of the refrigerant oil. Furthermore, by adding an oil reservoir below the oil pump, this invention increases the oil level within the reservoir, improving the working environment of the oil pump during compressor operation.

[0053] In summary, after reading this invention document, those skilled in the art can make various other corresponding modifications to the technical solutions and concepts based on this invention without creative mental effort, and all of these modifications fall within the scope of protection of this invention.

[0054] In the description of this utility model, it should be understood that the terms "upper end face", "lower end face", "top", "bottom", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model. Therefore, they should not be construed as limiting the actual direction of use of this utility model.

[0055] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A lower case structure for improving reliability of a compressor, characterized by, The system includes a compressor and a lower housing. The bottom of the inner wall of the lower housing is connected to an annular oil guide groove, and the center of the annular oil guide groove is connected to an oil storage tank. An annular oil guide groove outlet hole is provided on the inner wall surface of the annular oil guide groove near the oil storage tank, and an annular oil guide groove inlet hole is provided on the outer wall surface of the annular oil guide groove away from the oil storage tank. Multiple protrusions are formed on the outer wall and inner wall of the annular oil guide groove, and each protrusion surrounds a guide ring to form a one-way valve. The one-way valves are connected end to end. The oil storage tank is provided with an oil storage tank inlet hole and an oil storage tank outlet hole. The compressor includes a core, an oil pump, and a motor rotor. The core is connected to the oil pump, and the oil pump is connected to the oil sump of the lower housing. The axis of the oil storage tank is vertical and intersects with the lowest point of the inner wall of the lower housing.

2. The lower case structure for improving reliability of a compressor according to claim 1, wherein The oil storage tank is a circular hollow cylinder.

3. The lower case structure for improving reliability of a compressor according to claim 1, wherein The distance between the top plane of the annular oil guide groove and the bottom of the inner wall of the lower shell is greater than or equal to 14 mm and less than or equal to 18 mm.

4. The lower case structure for improving reliability of a compressor according to claim 1, wherein The oil inlet and outlet of the oil storage tank are located at the contact end between the wall of the oil storage tank and the inner wall of the lower shell.

5. The lower case structure for improving reliability of a compressor according to claim 1, wherein The cross-sectional area of ​​the oil inlet hole and the oil outlet hole of the annular oil guide groove are the same.

6. The lower case structure for improving reliability of a compressor according to claim 5, wherein The cross-sectional area of ​​the oil inlet and outlet of the annular oil guide groove is greater than or equal to 3 mm² and less than or equal to 10 mm².

7. The lower case structure for improving reliability of a compressor according to claim 1, wherein The distance between the top surface of the oil storage tank and the lowest point of the inner wall of the lower shell is greater than or equal to 6 mm and less than or equal to 17 mm.

8. The lower case structure for improving reliability of a compressor according to claim 1, wherein The inner diameter of the oil storage tank is larger than the diameter of the oil pump.

9. The lower case structure for improving reliability of a compressor according to claim 1, wherein The outer diameter of the oil storage tank is 60mm-85mm.

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