Shaft seal sealing structure without shaft seal check ring and automobile air conditioner compressor thereof

Abstract

The shaft seal sealing structure without the shaft seal check ring comprises a front cover, a shaft seal, a main shaft, a cylinder body and a rear cover, the main shaft penetrates through the front cover, the shaft seal, the cylinder body and the rear cover, the front cover and the rear cover are installed on the front portion and the rear portion of the cylinder body respectively, and the rear end of the main shaft is connected with the rear cover. The front end of the main shaft is fixed in a shaft diameter end hole of the front cover; three hole sections with different inner diameters exist in a shaft diameter end hole of the front cover, a third hole section, a second hole section and a first hole section are arranged from the opening portion of the shaft diameter end hole to the inner side, the inner diameter of the first hole section is equal to the inner diameter of the second hole section, the inner diameter of the third hole section is equal to the inner diameter of the first hole section, and the shaft seal is assembled in the first hole section. The utility model solves the problem of how to reduce the cost of the two-way compressor in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive air conditioning compressors, and in particular to a shaft seal sealing structure without a shaft seal retaining ring and its automotive air conditioning compressor. Background Technology

[0002] Currently, with the development of my country's economy and society and the improvement of people's living standards, the number of cars on the road is increasing nationwide, making cost control in the automotive market increasingly challenging, and leading to a downward trend in car prices. As a core component of the automotive air conditioning system, the compressor is an essential part of the vehicle, and the requirements for cost control are increasingly stringent while ensuring compressor reliability.

[0003] Existing bidirectional compressors have a mature structure, making cost reduction difficult. Current compressors all use compressors with shaft seal retaining rings (see...). Figure 1 and Figure 2 From the opening of the shaft diameter end hole 1-7 of the front cover 1 to the inner side, it includes a third hole section, a second hole section, and a first hole section. The inner diameter of the first hole section is... The inner diameter of the second hole section is The inner diameter of the third section is The shaft seal 2 is assembled in the second bore section. At this time, the protrusion 2-1 of the shaft seal 2 is embedded in the first bore section, which is called "positive pressure assembly," that is, the protrusion 2-1 of the shaft seal 2 faces the cylinder body 5. When the shaft seal 2 is under pressure, if there is no shaft seal retaining ring 8, the shaft seal 2 will be forced out by the air pressure in the low-pressure chamber 1-4. Therefore, the front cover 1 has a front cover retaining ring groove 1-1 for assembling the shaft seal retaining ring 8. Existing bidirectional compressors can effectively reduce costs by reducing the number of parts. Therefore, how to reduce the cost of bidirectional compressors has become a technical problem that needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a shaft seal sealing structure without a shaft seal retaining ring and its automotive air conditioning compressor, mainly to solve the problem of how to reduce the cost of bidirectional compressors in the above-mentioned prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a shaft seal sealing structure without a shaft seal retainer ring, characterized in that: the shaft seal sealing structure without a shaft seal retainer ring includes a front cover, a shaft seal, a main shaft, a cylinder body, and a rear cover; the main shaft passes through the front cover, the shaft seal, the cylinder body, and the rear cover; the front cover and the rear cover are respectively installed at the front and rear of the cylinder body; the rear end of the main shaft is connected to the rear cover; the front end of the main shaft is fixed in the shaft diameter end hole of the front cover;

[0006] The front cover has three sections with different inner diameters within the shaft diameter end hole. From the opening of the shaft diameter end hole to the inside, there are a third section, a second section, and a first section. The inner diameter of the first section is... The inner diameter of the second hole section is The inner diameter of the third section is The shaft is fitted into the first hole section.

[0007] Furthermore, the shaft seal is back-pressed into the first bore section, and the protrusion of the shaft seal is embedded into the second bore section.

[0008] An automotive air conditioning compressor, characterized in that: the automotive air conditioning compressor includes the above-mentioned shaft seal sealing structure without shaft seal retaining ring, and there is a front sealing gasket and valve plate component between the front cover and the cylinder; there is a rear sealing gasket and valve plate component between the rear cover and the cylinder.

[0009] Furthermore, a first low-pressure chamber, an oil hole, and a second low-pressure chamber are provided inside the front cover. The first low-pressure chamber is connected to the second low-pressure chamber through the oil hole, and the shaft seal is located inside the second low-pressure chamber.

[0010] In view of the above technical features, the present invention has the following beneficial effects:

[0011] 1. This utility model discloses a shaft seal sealing structure without a shaft seal retaining ring and its automotive air conditioning compressor. The shaft seal sealing structure contains three sections with different inner diameters within the front cover shaft diameter end hole. From the opening of the front cover shaft diameter end hole to the inner side, these are respectively the third section, the second section, and the first section. The inner diameter of the first section is... The inner diameter of the second hole section is The inner diameter of the third section is The shaft seal is fitted into the first hole section, and the shaft seal is assembled under reverse pressure. The conventional shaft seal retaining ring is eliminated, and the reverse of the shaft seal press-fit is changed. By eliminating the machining of the shaft retaining ring and the front cover retaining ring groove, the production cost of the compressor is reduced. It is a shaft seal sealing structure that does not affect the reliability of the shaft seal and can reduce costs. Attached Figure Description

[0012] Figure 1 It is the shaft seal sealing structure of the existing automotive air conditioning compressor (with a shaft seal retaining ring).

[0013] Figure 2 yes Figure 1 Enlarged view of a specific area.

[0014] Figure 3 It is the shaft seal sealing structure of the automotive air conditioning compressor in specific embodiment 1 (without a shaft seal retaining ring).

[0015] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0016] Figure 5 This is a schematic diagram of the structure of the automotive air conditioning compressor in specific embodiment 2;

[0017] Figure 6This is a schematic diagram of the front cover and shaft seal of the automotive air conditioning compressor in specific embodiment 2;

[0018] Figure 7 This is a schematic diagram of the working principle of the automotive air conditioning compressor in specific embodiment 2.

[0019] In the figure: 1. Front cover; 1-1. Front cover retaining ring groove in the prior art; 1-2. High pressure chamber; 1-3. First low pressure chamber; 1-4. Second low pressure chamber; 1-5. Oil hole; 1-6. Step formed between the first hole section and the second hole section;

[0020] 2. Shaft seal; 2-1. Protrusion;

[0021] 3. Front sealing gasket and valve plate components;

[0022] 4. Spindle;

[0023] 5. Cylinder block;

[0024] 6. Rear sealing gasket and valve plate assembly;

[0025] 7. Back cover;

[0026] 8. Shaft seal retaining ring in the prior art.

[0027] 9. Piston;

[0028] 10. Inclined plate;

[0029] 11. Intake valve plate;

[0030] 12. Exhaust valve plate. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0032] See Figures 3 to 4 In specific embodiment 1, this embodiment 1 provides a shaft seal 2 sealing structure without shaft seal retaining ring 8, including front cover 1, shaft seal 2, main shaft 4, cylinder body 5 and rear cover 7. The main shaft 4 passes through the front cover 1, shaft seal 2, cylinder body 5 and rear cover 7. The front cover 1 and rear cover 7 are respectively installed at the front and rear of the cylinder body 5. The rear end of the main shaft 4 is connected to the rear cover 7. The front end of the main shaft 4 is fixed in the shaft diameter end hole 1-7 of the front cover 1.

[0033] The front cover 1 has three sections with different inner diameters within its shaft diameter end hole 1-7. From the opening of the shaft diameter end hole 1-7 to the inside, it includes a third section, a second section, and a first section. The inner diameter of the first section is... The inner diameter of the second hole section is The inner diameter of the third section is Shaft seal 2 is assembled in the first hole section, at which time the first hole section is the assembly section of shaft seal 2.

[0034] The shaft seal 2 is back-pressed into the first hole section, and the protrusion 2-1 of the shaft seal 2 is embedded into the second hole section. Compared with the shaft seal 2 installation method in the prior art, the shaft seal 2 installation method in this embodiment 1 is "back-press assembly", which is opposite to the press-fitting direction of the shaft seal 2 in the prior art, that is, changing the positioning contact surface between the shaft seal 2 and the front cover 1. For example, the second low-pressure chamber 1-4 contains pressure from the normal operation of the compressor. When the shaft seal 2 is subjected to pressure in the second low-pressure chamber 1-4, because the inner diameter of the front section is smaller than the inner diameter of the shaft seal 2 assembly section (that is, the inner diameter of the second hole section is smaller than the inner diameter of the first hole section), the shaft seal 2 will not be pushed out. Moreover, under the action of pressure, the shaft seal 2 fits more closely to the front cover 11. That is, the step portion 1-6 formed between the first hole section and the second hole section fits more tightly with the shaft seal 2, which can more effectively play a sealing role.

[0035] The shaft seal 2 sealing structure without shaft seal retaining ring 8 in this embodiment 1 eliminates the conventionally used shaft seal retaining ring 8 and changes the reverse of the shaft seal 2 press-fitting. By eliminating the machining of shaft seal retaining ring 8 and front cover retaining ring groove 1-1, the production cost of the sealing structure is reduced. It is a shaft seal 2 sealing structure that does not affect the sealing reliability of shaft seal 2 and can reduce costs.

[0036] See Figures 3 to 7 In specific embodiment 2, an automotive air conditioning compressor is provided, including the aforementioned shaft seal 2 sealing structure without shaft seal retaining ring 8. A front sealing gasket and valve plate component 3 are located between the front cover 1 and the cylinder body 5; a rear sealing gasket and valve plate component 6 are located between the rear cover 7 and the cylinder body 5. The front sealing gasket and valve plate component 3 and the rear sealing gasket and valve plate component 6 are prior art and will not be described further here.

[0037] The front cover 1 contains a first low-pressure chamber 1-3, an oil hole 1-5, and a second low-pressure chamber 1-4. Specifically, the first low-pressure chamber 1-3, oil hole 1-5, and second low-pressure chamber 1-4 are located inside the front cover 1. The first low-pressure chamber 1-3 is connected to the second low-pressure chamber 1-4 through the oil hole 1-5. The shaft seal 2 is located within the second low-pressure chamber 1-4. The second low-pressure chamber 1-4 contains pressure from the normal operation of the compressor.

[0038] In this embodiment 2, the automotive air conditioning compressor eliminates the conventionally used shaft seal retaining ring 8 and reverses the press-fitting direction of the shaft seal 2. This is achieved by eliminating the machining of the shaft seal retaining ring 8 and the front cover retaining ring groove 1-1. When the compressor reciprocates, it is subjected to pressure from the low-pressure chamber. By improving the inner diameter of the shaft diameter section of the front cover 1, the shaft seal 2 sealing structure without the shaft seal retaining ring 8 can effectively reduce the production cost of the compressor. This is a shaft seal 2 sealing structure that does not affect the sealing reliability of the shaft seal 2 while reducing costs.

[0039] In this embodiment 2, the automotive air conditioning compressor, taking a double-sided swashplate piston compressor as an example, works as follows (as is the prior art): First, low-pressure gas enters the compressor body from the intake port ①, passes through the low-pressure chamber and enters the front and rear cover low-pressure chambers ② (for example, through the first low-pressure chamber 1-3 and through the oil hole 1-5 into the second low-pressure chamber 1-4). As the piston 9 moves, the intake valve 11 opens and enters the piston hole ③. Second, the clutch drives the main shaft swashplate component (for example, swashplate 10) to make the piston perform axial compression movement, compressing the low-pressure gas. When a certain pressure is reached, the exhaust valve 12 opens, and the high-pressure gas enters the front and rear cover high-pressure chambers ④ (for example, the high-pressure chamber 1-2 of the front cover 1), and is discharged from the compressor through the high-pressure chamber of the body and the high-pressure interface ⑤.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A shaft seal sealing structure without a shaft seal retaining ring, characterized in that: The shaft seal sealing structure without a shaft seal retainer ring includes a front cover (1), a shaft seal (2), a main shaft (4), a cylinder body (5), and a rear cover (7). The main shaft (4) passes through the front cover (1), the shaft seal (2), the cylinder body (5), and the rear cover (7). The front cover (1) and the rear cover (7) are installed at the front and rear of the cylinder body (5), respectively. The rear end of the main shaft (4) is connected to the rear cover (7). The front end of the main shaft (4) is fixed in the shaft diameter end hole (1-7) of the front cover (1). The front cover (1) has three sections with different inner diameters in the shaft diameter end hole (1-7). From the opening of the shaft diameter end hole (1-7) to the inside, there are three sections: the third section, the second section and the first section. The inner diameter of the first section is ∅a, the inner diameter of the second section is ∅b, and the inner diameter of the third section is ∅c. ∅b < ∅c < ∅a. The shaft seal (2) is assembled in the first section.

2. The shaft seal sealing structure without a shaft seal retaining ring according to claim 1, characterized in that: The shaft seal (2) is back-pressed into the first hole section, and the protrusion (2-1) of the shaft seal (2) is embedded into the second hole section.

3. An automotive air conditioning compressor, characterized in that: The automotive air conditioning compressor includes a shaft seal sealing structure without a shaft seal retaining ring as described in claim 1 or 2 above, with a front sealing gasket and valve plate component (3) between the front cover (1) and the cylinder (5); and a rear sealing gasket and valve plate component (6) between the rear cover (7) and the cylinder (5).

4. The automotive air conditioning compressor according to claim 3, characterized in that: The front cover (1) is provided with a first low-pressure chamber (1-3), an oil hole (1-5), and a second low-pressure chamber (1-4). The first low-pressure chamber (1-3) is connected to the second low-pressure chamber (1-4) through the oil hole (1-5). The shaft seal (2) is located in the second low-pressure chamber (1-4).

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