Mechanical seal for automobile air conditioner compressor

Abstract

The utility model provides a mechanical seal for an automobile air conditioner compressor, which comprises a moving ring seat and a flange plate, a static ring is assembled in a first mounting groove at one end of the flange plate, a moving ring is assembled at one end of the moving ring seat, one end of the moving ring is rotatably attached to one end of the static ring, and an elastic compensation part is arranged between the other end of the moving ring and the moving ring seat; a second mounting groove is concavely formed in the bottom of the first mounting groove, the diameter of the second mounting groove is smaller than that of the first mounting groove, a lip seal is assembled at the bottom of the second mounting groove, the inner wall of the lip seal is attached to the outer wall of the rotating shaft in a sealed mode, and a leakage cavity is formed between the lip seal and the static ring; the outer end of the connecting hole is connected with a leakage collecting pipe, and an exhaust through hole communicated with the leakage cavity is formed in the side wall of the upper end of the flange plate. The mechanical seal for the automobile air conditioner compressor is simple in structure, convenient to install, capable of being suitable for high-power and high-linear-speed working conditions, stable in sealing performance and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, specifically, relate to a kind of mechanical seal for automobile air conditioner compressor. BACKGROUND

[0002] Automobile air conditioner is indispensable part of car, in order to make air conditioner reach practical effect, according to air conditioner principle, there will be a compressor in it necessarily.Automobile air conditioner compressor is divided into crankshaft connecting rod type compressor, axial piston type compressor, rotary vane compressor and scroll compressor according to different structures.

[0003] Among them, the axial piston type compressor is widely used, which can be further divided into one-way rocker plate type and two-way inclined plate type.The advantages of this type of compressor are: mature manufacturing technology, compact structure, certain requirements for manufacturing, and lower manufacturing cost.The one-way rocker plate type compressor has higher reliability and obvious advantages in harsh working conditions, and is widely used in trucks and engineering vehicles.

[0004] In the prior art, the common sealing forms for one-way rocker plate type compressor include lip seal, packing seal and simple mechanical seal with rubber bellows.These sealing forms can effectively cope with traditional working conditions, but have their own application limitations.Lip seal can be well handled in low-power compressors, but in high-power, high-pressure and high linear speed conditions, the lip wear often does not meet the service life.The mechanical seal structure with rubber bellows can handle higher speed and higher pressure, and can well handle most field working conditions, but the rubber bellows of higher power compressors often cannot withstand pressure, thereby reducing the service life of the mechanical seal.Packing seal often consumes shaft power, has short service life, high leakage rate and other factors, and is used less and less.

[0005] In the air conditioner compressor of large bus and truck, the working conditions are usually high power and high linear speed, and the existing sealing structure is usually difficult to meet the requirements, and the existing mechanical seal cannot realize leakage collection, so a high-performance mechanical seal structure needs to be developed. INVENTION CONTENTS

[0006] To overcome at least one defect in the above prior art, the utility model provides a kind of mechanical seal for automobile air conditioner compressor, simple structure, easy to install, can be suitable for high power, high linear speed working condition, and sealing performance is stable, and service life is long.

[0007] The utility model provides a kind of mechanical seal for automobile air conditioner compressor: including the dynamic ring seat and flange plate of being sleeved in the outer portion of rotating shaft, first installation slot is provided on the inner wall of the one end of dynamic ring seat near flange plate, static ring is fitted in first installation slot, the dynamic ring of being slidably along its axial direction is fitted in the one end of dynamic ring seat near flange plate, the one end of dynamic ring and the one end of static ring can be relatively rotated and abut to form sealing surface along circumference, and elastic compensation piece is arranged between the other end of dynamic ring and dynamic ring seat;The bottom of first installation slot is recessed to form second installation slot towards the side away from static ring, and the diameter of second installation slot is less than the diameter of first installation slot, lip seal is fitted in the bottom of second installation slot, the inner wall of lip seal is sealed and fitted with the outer wall of rotating shaft, and gap is left between lip seal and static ring to form leakage cavity, and the connecting hole that is communicated to leakage cavity is formed on the lower end side wall of flange plate, leakage collection pipe is detachably connected to the outer end of connecting hole, and the exhaust through-hole that is communicated to leakage cavity is formed on the side wall of flange plate upper end.

[0008] The mechanical seal for automobile air conditioner compressor of the utility model has the following advantages compared with prior art.

[0009] In the mechanical seal structure for automobile air conditioner compressor of the utility model, compared with the traditional mechanical seal structure, static ring is fitted on flange plate, and lip seal is also fitted, and leakage cavity is arranged between lip seal and static ring, once sealing surface leaks, liquid leakage will not directly overflow to outer wall environment, but accumulate in leakage cavity, and corresponding leakage collection pipe is connected to the lower end side wall of flange plate, to realize liquid leakage collection, more importantly, exhaust through-hole that is communicated to leakage cavity is formed on flange plate in this structure, to realize internal and external pressure environment communication, avoid that liquid leakage cannot flow to leakage collection pipe position in time due to sealing environment in leakage cavity, and fine leakage can be collected through leakage collection pipe, without maintenance and replacement, reduce maintenance frequency, and prolong service life.

[0010] As improvement, annular process groove is formed on the end face of static ring away from dynamic ring side, process groove is used to divide the end face of static ring into radially distributed first end face and second end face, and second end face is abutted with the bottom of first installation slot.

[0011] Further improved, the inner wall of one end of the dynamic ring seat is recessed and provided with an annular mounting channel, one end of the dynamic ring is slidably fitted in the mounting channel, and the elastic compensation member is located between the tail end of the dynamic ring and the bottom of the mounting channel; the inner wall of the other end of the dynamic ring seat is provided with an annular embedding groove, and a rubber profile ring is fitted in the embedding groove, and the inner wall of the rubber profile ring is tightly matched with the outer wall of the rotating shaft to realize the transmission connection between the dynamic ring seat and the rotating shaft.

[0012] Further improved, the elastic compensation member comprises a plurality of cylindrical springs, the bottom of the mounting channel is provided with a plurality of spring holes distributed in the circumferential direction, one end of each of the cylindrical springs is respectively fitted and positioned in the corresponding spring hole, and the other end abuts against the tail end of the dynamic ring.

[0013] Further improved, the outer wall of the dynamic ring seat is provided with a plurality of liquid inlet channels communicated with the mounting channel, and a communication hole is formed in the center of the bottom of each spring hole.

[0014] Further improved, the outer peripheral wall of the dynamic ring away from one end of the static ring is outwardly convex and formed with a positioning boss, the outer peripheral wall of the positioning boss is provided with a plurality of guide grooves distributed in the circumferential direction and penetrating through the axial two ends, and the inner wall of the mounting channel is outwardly convex and formed with a plurality of guide protrusions slidably matched with the guide grooves.

[0015] Further improved, the inner wall of the opening end of the mounting channel is provided with a fitting groove, a snap spring is fitted in the fitting groove, and one end of the snap spring abuts against the outer end of the positioning boss, so that the dynamic ring, the elastic compensation member and the dynamic ring seat are preassembled into an integrated structure.

[0016] Preferably, the dynamic ring is made of silicon carbide, and the static ring is made of carbonized silicon carbide.

[0017] The above-mentioned improvements of the utility model will be specifically described in the following specific embodiments, and some of them will become apparent from the description or be understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure diagram of the mechanical seal for the automobile air conditioner compressor of the utility model;

[0019] Figure 2 It is a semi-section structure diagram of the mechanical seal for the automobile air conditioner compressor of the utility model;

[0020] Figure 3 It is a local section view of the static ring in the utility model;

[0021] Figure 4 is a structure diagram of the dynamic ring in the utility model;

[0022] Figure 5 is a structure diagram of the dynamic ring seat in the utility model.

[0023] Explanation of reference signs:

[0024] 1, dynamic ring seat; 2, flange plate; 3, first installation groove; 4, static ring; 5, dynamic ring; 6, second installation groove; 7, lip seal; 8, leakage cavity; 9, connecting hole; 10, leakage collection pipe; 11, exhaust through hole; 12, process groove; 13, first end face; 14, second end face; 15, installation channel; 16, embedded groove; 17, rubber profiled ring; 18, cylindrical spring; 19, spring hole; 20, liquid inlet channel; 21, communication hole; 22, positioning boss; 23, guide groove; 24, guide protrusion; 25, matching groove; 26, snap spring. DETAILED DESCRIPTION

[0025] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0026] In the description of the embodiments of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "fixed", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0027] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0028] Reference should be made to Figures 1-5As shown, the automobile air conditioner compressor mechanical seal disclosed by the embodiment of the application comprises a dynamic ring seat 1 and a flange plate 2, the dynamic ring seat 1 is sleeved on the outside of the rotating shaft of the compressor and is in transmission connection with the rotating shaft of the compressor, that is, the dynamic ring seat 1 can rotate synchronously with the rotating shaft, the radial outer end of the flange plate 2 is connected to the shell of the compressor, that is, the flange plate 2 is static, a first installation groove 3 is arranged on the inner wall of the end of the flange plate 2 close to the dynamic ring seat 1, a static ring 4 is arranged in the first installation groove 3, a sealing groove is arranged in the inner recess of the outer wall of the first installation groove 3, a sealing ring is arranged in the sealing groove, and the inner ring of the sealing ring is sealingly fitted on the outer wall of the static ring 4; a dynamic ring 5 which can slide along the axial direction of the dynamic ring seat 1 is arranged at the end of the dynamic ring seat 1 close to the flange plate 2, one end of the dynamic ring 5 is in circumferential relative rotation abutment with one end of the static ring 4 to form a sealing surface, and an elastic compensation member is arranged between the other end of the dynamic ring 5 and the dynamic ring seat 1, under the action of the elastic compensation member, the dynamic ring 5 is always in close sealing contact with the static ring 4, and after the sealing surface is worn, the dynamic ring 5 can move forward to compensate for the wear amount under the action of the elastic compensation member, so that the sealing performance is stable.

[0029] In addition, in the above structure, the bottom of the first installation groove 3 is recessed towards the side away from the static ring 4 to form a second installation groove 6, and the diameter of the second installation groove 6 is smaller than that of the first installation groove 3, specifically, there is still an annular step surface at the bottom of the first installation groove 3; a lip seal 7 is arranged at the bottom of the second installation groove 6, the inner wall of the lip seal 7 is sealingly in contact with the outer wall of the rotating shaft, a gap is left between the lip seal 7 and the static ring 4 to form a leakage cavity 8, a connecting hole 9 which is communicated with the leakage cavity 8 is formed in the side wall of the lower end of the flange plate 2, a leakage collection pipe 10 is detachably connected to the outer end of the connecting hole 9, and an exhaust through hole 11 which is communicated with the leakage cavity 8 is formed in the side wall of the upper end of the flange plate 2. In this structure, when the sealing surface leaks slightly, the medium will enter the leakage cavity 8, and as the leakage increases, the leakage collection is realized through the leakage collection pipe 10. In addition, in this structure, the exhaust hole can accelerate the leakage into the leakage collection pipe 10, if the exhaust hole is not opened, the leakage cavity 8 is in a closed cavity, and the medium leaked from the sealing surface is not easy to flow and is difficult to flow quickly to the leakage collection pipe 10.

[0030] Referring to the drawings Figure 2 , 3In the embodiment, a process groove 12 is arranged on the end face of the static ring 4 away from the dynamic ring 5, the process groove 12 is used to divide the end face of the static ring 4 into a first end face 13 and a second end face 14 distributed inside and outside in the radial direction, and the second end face 14 abuts against the bottom of the first mounting groove 3. In the structure, the cross section of the process groove 12 is V-shaped structure, which is convenient for processing, and after being arranged in this way, only a small contact area exists between the static ring 4 seat and the back of the static ring 4, the contact face width is about 1.5-2mm, the tail end of the static ring 4 is divided into two parts, so from the processing technology, it can be better ensured that the second end face 14 part in contact with the bottom of the first mounting groove 3 is flat, and at the same time, the metal deformation under pressure will not cause excessive deformation of the static ring 4, so as to ensure the stability of the sealing performance.

[0031] In another aspect, referring to the accompanying drawings Figure 5 In the embodiment, an annular mounting channel 15 is arranged in the recess of one end of the dynamic ring seat 1 close to the flange plate 2, one end of the dynamic ring 5 is slidably fitted in the mounting channel 15, and a sealing ring is fitted between the inner wall of the dynamic ring 5 and the outer wall of the rotating shaft; the elastic compensation member is located between the tail end of the dynamic ring 5 and the bottom of the mounting channel 15; an annular embedding groove 16 is arranged on the inner wall of the other end of the dynamic ring seat 1, a rubber profile ring 17 is fitted in the embedding groove 16, and the inner wall of the rubber profile ring 17 is tightly fitted with the outer wall of the rotating shaft to realize the transmission connection between the dynamic ring seat 1 and the rotating shaft. The rubber profile ring 17 in the structure plays a sealing and tight holding role on the rotating shaft, compared with the traditional driving connection structure, the driving structure of the locking screw and the transmission pin is omitted, which is convenient for installation and maintenance and reduces the cost. In the structure, preferably, the cross section of the rubber profile ring 17 is L-shaped structure, the inner wall of the end of the dynamic ring seat 1 away from the mounting channel 15 is provided with a notch connected to the embedding groove 16, so that when the rubber profile ring 17 is fitted, the outer side of the vertical section part is fitted in the embedding groove 16, the outer side of the horizontal end part is fitted in the notch part, the stable cooperation between the rubber profile ring 17 and the dynamic ring seat 1 is realized, and the inner wall of the rubber profile ring 17 is a complete horizontal surface, which is used to tightly fit on the outer wall of the rotating shaft to ensure the stability of the tight transmission force. In addition, in order to facilitate the sleeving of the dynamic ring seat 1 and the rotating shaft, a guide inclined surface is arranged on the inner side of the end of the rubber profile ring 17 away from the dynamic ring 5.

[0032] More specifically, referring to the accompanying drawings Figure 2 and 5The elastic compensation member in the embodiment comprises a plurality of cylindrical springs 18. The bottom of the mounting channel 15 is provided with a plurality of spring holes 19 distributed in the circumferential direction. One end of each cylindrical spring 18 is respectively fitted in the corresponding spring hole 19, and the one end of the cylindrical spring 18 abuts against the bottom of the spring hole 19. The other end of the cylindrical spring 18 abuts against the tail end of the movable ring 5. The elastic compensation member composed of the plurality of cylindrical springs 18 makes the compensation performance more uniform, and the setting of the spring holes 19 ensures the compression stability of the plurality of cylindrical springs 18, thereby ensuring the stability of the compensation performance.

[0033] In the embodiment, a plurality of liquid inlet channels 20 are formed in the outer wall of the movable ring seat 1 and communicated with the mounting channel 15. A communication hole 21 is formed in the center of the bottom of each spring hole 19. In this way, during the operation of the equipment, the medium can flow into or out of the mounting channel 15 more quickly. In addition, the communication hole 21 formed in the bottom of each spring hole 19 also facilitates the inflow and outflow of the medium, and the flowing medium can also flush the cylindrical springs 18, avoiding the accumulation of particles in the gap of the cylindrical springs 18 and affecting the elastic compensation performance.

[0034] Continuing to refer to the drawings, Figure 2 , 4 and 5, in another aspect, the outer circumferential wall of the end of the movable ring 5 away from the stationary ring 4 is outwardly protruding and formed with a positioning boss 22. A plurality of guide grooves 23 are formed in the outer circumferential wall of the positioning boss 22 and communicated between the two axial ends. A plurality of guide protrusions 24 are outwardly protruding and formed on the inner wall of the mounting channel 15 and respectively slidably matched with the guide grooves 23. The guide structure makes the axial movement of the movable ring 5 in the mounting channel 15 more stable and prevents circumferential deflection. In this structure, the guide protrusions 24 are integrally stamped from the outside to the inside on the outer circumferential wall of the movable ring seat 1, which is convenient. More specifically, a fitting groove 25 is formed in the inner wall of the opening end of the mounting channel 15. A snap spring 26 is fitted in the fitting groove 25, and one end of the snap spring 26 abuts against the outer end of the positioning boss 22, so that the movable ring 5, the elastic compensation member, and the movable ring seat 1 are preassembled as an integral structure. In this structure, the movable ring 5 can be preassembled as a component in the factory, which facilitates the integral installation of the movable ring 5 on the shaft during on-site installation, reduces the installation difficulty, and avoids the loss caused by the large number of parts during on-site assembly.

[0035] In the embodiment, the dynamic ring 5 is made of silicon carbide, and the static ring 4 is made of carbonized silicon carbide. In the working condition of various oils of the automobile air conditioner compressor, the sealing surface of the sealing ring made of different types of silicon carbide materials can improve the PV value while ensuring wear resistance, and can resist higher pressure and speed. In addition, the sealing ring and the rubber special-shaped ring 17 are made of hydrogenated butyronitrile rubber, which is more difficult to withstand high temperature than traditional butyronitrile rubber, more resistant to oil than fluororubber, and cheaper in price, thereby reducing the cost of the whole mechanical seal.

[0036] In other embodiments, the dynamic ring material can also be graphite according to different working conditions.

[0037] In the description of the present application, the description of the terms "the embodiment", "some embodiments", and the like means that the specific features, mechanisms, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0038] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A mechanical seal for an automotive air conditioning compressor, characterized in that: The application relates to a rotating shaft sealing device, which comprises a rotating ring seat (1) sleeved on the outside of a rotating shaft and a flange plate (2), wherein a first mounting groove (3) is arranged on the inner wall of the end of the rotating ring seat (1) close to the flange plate (2), a static ring (4) is arranged in the first mounting groove (3), a rotating ring (5) which can slide along the axial direction of the rotating ring seat (1) is arranged on the end of the rotating ring seat (1) close to the flange plate (2), the end of the rotating ring (5) is in contact with the end of the static ring (4) and can rotate relative to the end of the static ring (4) in the circumferential direction to form a sealing surface, and an elastic compensation member is arranged between the other end of the rotating ring (5) and the rotating ring seat (1); the bottom of the first mounting groove (3) is concave towards the side away from the static ring (4) to form a second mounting groove (6), the diameter of the second mounting groove (6) is smaller than that of the first mounting groove (3), a lip seal (7) is arranged on the bottom of the second mounting groove (6), the inner wall of the lip seal (7) is in sealing contact with the outer wall of the rotating shaft, a gap is left between the lip seal (7) and the static ring (4) to form a leakage cavity (8), a connecting hole (9) which is connected to the leakage cavity (8) is arranged on the side wall of the lower end of the flange plate (2), a leakage collection pipe (10) is detachably connected to the outer end of the connecting hole (9), and an exhaust through hole (11) which is connected to the leakage cavity (8) is arranged on the side wall of the upper end of the flange plate (2).

2. The mechanical seal for an automobile air conditioner compressor according to claim 1, characterized by: An annular process groove (12) is arranged on the end face of the side of the static ring (4) away from the rotating ring (5), the process groove (12) is used for dividing the end face of the static ring (4) into a first end face (13) and a second end face (14) which are distributed inside and outside in the radial direction, and the second end face (14) is in contact with the bottom of the first mounting groove (3).

3. The mechanical seal for an automotive air conditioner compressor according to claim 1, characterized by: The end of the rotating ring seat (1) close to the flange plate (2) is concave and provided with an annular mounting channel (15), one end of the rotating ring (5) is slidably arranged in the mounting channel (15), and the elastic compensation member is located between the tail end of the rotating ring (5) and the bottom of the mounting channel (15); an annular embedding groove (16) is arranged on the inner wall of the other end of the rotating ring seat (1), a rubber profile ring (17) is arranged in the embedding groove (16), and the inner wall of the rubber profile ring (17) is in close contact with the outer wall of the rotating shaft to realize the transmission connection between the rotating ring seat (1) and the rotating shaft.

4. The mechanical seal for an automotive air conditioner compressor according to claim 3, characterized by: The elastic compensation member comprises a plurality of cylindrical springs (18), the bottom of the mounting channel (15) is provided with a plurality of spring holes (19) which are distributed in the circumferential direction, one end of each cylindrical spring (18) is arranged and positioned in the corresponding spring hole (19), and the other end is in contact with the tail end of the rotating ring (5).

5. The mechanical seal for an automotive air conditioner compressor according to claim 4, characterized by: A plurality of liquid inlet channels (20) which are connected to the mounting channel (15) are arranged on the outer wall of the rotating ring seat (1), and a communication hole (21) is arranged at the center position of the bottom of each spring hole (19).

6. The mechanical seal for an automotive air-conditioning compressor according to any one of claims 3 to 5, characterized by: The outer circumferential wall of the positioning boss (22) at one end away from the static ring (4) is outwardly convexly formed, and a plurality of guide grooves (23) are arranged on the outer circumferential wall of the positioning boss (22) and distributed in a circumferential direction and penetrating through both axial ends, and a plurality of guide protrusions (24) are outwardly convexly formed on the inner wall of the mounting channel (15) and respectively slide-fitted with the guide grooves (23).

7. The mechanical seal for an automotive air conditioner compressor according to claim 6, characterized by: A fitting groove (25) is arranged on the inner wall of the opening end of the mounting channel (15), a snap spring (26) is fitted in the fitting groove (25), and one end of the snap spring (26) abuts against the outer end of the positioning boss (22), so that the dynamic ring (5), the elastic compensation member and the dynamic ring seat (1) are pre-assembled into an integrated structure.

8. The mechanical seal for an automotive air conditioner compressor according to claim 6, characterized by: The dynamic ring (5) is made of silicon carbide, and the static ring (4) is made of carbon-added silicon carbide.

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