CN112413939B

CN112413939B - Vibration-damping noise-reducing expansion valve of automobile air conditioner

Info

Publication number: CN112413939B
Application number: CN202011428962.9A
Authority: CN
Inventors: 王晖; 应伟军
Original assignee: Jiyang College of Zhejiang A&F University
Current assignee: ZHEJIANG JUNZHI AUTO PARTS CO.,LTD.
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-11-09
Anticipated expiration: 2040-12-07
Also published as: CN112413939A

Abstract

The invention belongs to the technical field of expansion valves, and particularly relates to a vibration and noise reduction automobile air conditioner expansion valve which comprises a valve body and a valve core, wherein a refrigerant inlet and a refrigerant outlet are respectively arranged on the valve body, and the top of the valve core is fixedly connected with a valve ball; a sliding cavity matched with the valve element is formed in the valve body, a push groove is formed in the top end of the valve body, a diaphragm is arranged in the valve body at the top end of the valve element, a push rod is mounted on the diaphragm, a through groove is formed in the valve element, a valve seat is connected to the inner wall of the refrigerant inlet in a threaded manner, a limiting column is fixedly connected to the middle of the top surface of the valve seat, a limiting groove is formed in the middle of the bottom surface of the valve element, and a spring is arranged between the valve element and the valve seat; the expansion valve has the advantages that the internal structure of the expansion valve is arranged, the radial rotation of the valve body in the up-and-down movement process is effectively prevented, the internal structure of the valve body is simpler and is easier to process, and the production cost of the expansion valve is greatly reduced.

Description

Vibration-damping noise-reducing expansion valve of automobile air conditioner

Technical Field

The invention belongs to the technical field of expansion valves, and particularly relates to a vibration and noise reduction automobile air conditioner expansion valve.

Background

The automobile air conditioning system takes a compressor as a power source, and the compressor does work to enable refrigerant to sequentially pass through the compressor, a condenser, an expansion valve and an evaporator and then return to the compressor. The expansion valve functions to establish system pressure differential and control flow throughout the refrigeration cycle. The valve core of the existing expansion valve is balanced by the spring force and the mandril force in the axial direction, but no constraint exists in the radial direction, when a refrigerant impacts the valve core and the small ball, the impact force borne by the valve core in the radial direction cannot be balanced, and therefore the small ball and the valve core vibrate. And the problem of noise and vibration of the expansion valve caused by lack of radial spacing between the valve core and the valve body of the conventional automobile air-conditioning expansion valve.

Some technical schemes related to an expansion valve of an automobile air conditioner also appear in the prior art, for example, a chinese patent with patent number 2013201516070, the invention provides a structure of an expansion valve of an automobile air conditioner with vibration and noise reduction, which has the following technical scheme: the refrigerant inlet and the refrigerant outlet are arranged on the valve body, the top of the valve core is fixedly connected with a small ball, and a spring is arranged in the valve core. The utility model can limit the valve core in radial and circumferential directions, and lead the refrigerant under the high-pressure turbulent flow state to be evenly distributed, reduce the vibration excited by the high-speed high-pressure flow of the refrigerant, prolong the service life of the pipeline and avoid the pipeline from being damaged by strong vibration; and sharp abnormal sound at the moment of opening the expansion valve can be eliminated, NVH index of the whole vehicle is improved, and the riding comfort of the vehicle is improved.

Although the expansion valve in the above-mentioned technique can realize carrying out radial spacing effect to the motion of case, still have the problem that case and valve body inner chamber structure are complicated simultaneously to make the manufacturing cost of expansion valve increase, the processing degree of difficulty grow.

In view of the above, the invention provides a vibration and noise reduction automobile air conditioner expansion valve, which effectively prevents the valve body from radially rotating in the up-and-down movement process by arranging the internal structure of the expansion valve, and simultaneously makes the internal structure of the valve body simpler and easier to process and produce, thereby greatly reducing the production cost of the expansion valve.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the vibration-damping noise-reducing automobile air-conditioning expansion valve, through arranging the structure in the expansion valve, the situation that the valve body rotates radially in the up-and-down movement process is effectively prevented, and meanwhile, the structure in the valve body is simpler and is easier to process and produce, so that the production cost of the expansion valve is greatly reduced.

The technical scheme adopted by the invention for solving the technical problems is as follows: a vibration and noise reduction automobile air conditioner expansion valve comprises a valve body and a valve core positioned in the valve body, wherein a refrigerant inlet and a refrigerant outlet are respectively formed in the bottom end and the top end of the valve body, and the top of the valve core is fixedly connected with a valve ball; a sliding cavity is formed in the valve body, the valve core is matched with the sliding cavity in shape and is connected with the sliding cavity in a sliding mode, a push groove communicated with the sliding cavity is formed in the top end of the valve body, the side end of the push groove is communicated with a refrigerant outlet, a diaphragm is arranged in the valve body at the top end of the valve core, a push rod is installed on the diaphragm, the bottom end of the push rod penetrates through the push groove and is located at the top of a valve ball, a group of annular and uniformly distributed through grooves are formed in the valve core along the axial direction of the valve core, a valve seat is connected to the inner wall of the refrigerant inlet in a threaded mode, a limiting column with a polygonal cross section is fixedly connected to the middle of the top face of the valve seat, a limiting groove matched with the limiting column is formed in the middle of the bottom face of the valve core, a spring is movably arranged between the valve core and the valve seat, and a flow passage is formed in the valve seat; during operation, although the expansion valve in the prior art can realize the effect of radially limiting the movement of the valve core, the problem of complex structure of the valve core and the inner cavity of the valve body also exists, so that the production cost of the expansion valve is increased, and the processing difficulty is increased; when the vibration-damping noise-reducing automobile air-conditioning expansion valve is used, when the valve core is installed, the valve core is firstly inserted into the sliding cavity, then the limiting column on the valve seat is inserted into the limiting groove in advance, then the valve seat is twisted, so that the valve seat drives the valve core to synchronously rotate through the limiting column and is assembled on the valve body at the same time when rotating, meanwhile, the valve seat can apply pressure to the spring when being screwed into the valve body, so that the spring can extrude the valve core and drive the valve ball to plug the bottom end of the push groove, when the expansion valve works, the diaphragm overcomes the elastic force of the spring to drive the push rod to slide towards the bottom end of the push groove, the push rod can push the valve ball and the valve core downwards and enable the valve ball not to block the push groove any more, and then the refrigerant flows into the sliding cavity from the flow passage on the valve seat and flows out of the expansion valve from the refrigerant outlet through the through groove and the push groove; and at the in-process of valve body up-and-down motion, spacing groove on the valve body slides for spacing post, and spacing post can play effectual spacing effect to the spacing groove lateral wall this moment to prevent that the valve body from taking place radial pivoted condition at the in-process of up-and-down motion, spacing to the case through setting up spacing groove and spacing post matched with form simultaneously, make the inside structure of valve body simpler, and change in processing production, thereby greatly reduced the manufacturing cost of expansion valve.

Preferably, an arc-shaped groove communicated with the through groove is formed in the valve core, an arc-shaped plate is connected to the inside of the arc-shaped groove in a sliding mode, an elastic block is connected to one end of the arc-shaped plate and the end portion of the arc-shaped groove, communicating holes matched with the through grooves one by one are formed in the arc-shaped plate, a first magnetic block is arranged on the outer wall of the valve body, a second magnetic block is embedded in the position, close to the first magnetic block, of the arc-shaped plate, and magnetic poles of the ends, close to the second magnetic block, of the first magnetic block and the second magnetic block are the same; when the expansion valve works, when the expansion valve is in a non-working state, the arc-shaped plate seals the through groove under the action of the elastic block, the through groove is in a closed state at the moment, the condition that a refrigerant flows from the through groove to the push groove when the surface of the valve ball is abraded or poorly sealed is prevented, thereby the work of the expansion valve is more stable, when the expansion valve is in the working state, the valve core moves downwards under the action of the push rod, and the arc-shaped plate is gradually close to the first magnetic block, at the moment, the first magnetic block can gradually apply repulsive force to the second magnetic block, and the arc-shaped plate rotates in the arc-shaped groove, when one end of the arc-shaped plate far away from the elastic block is attached to the side wall of the arc-shaped groove, the communicating holes on the arc-shaped plate can be respectively aligned and communicated with the through grooves, the through groove is in an open state, so that the work of the expansion valve can be smoothly and effectively carried out.

Preferably, the bottom end of the valve core is provided with an annular block, the top surface of the annular block is provided with a convex ring, the bottom surface of the valve core is provided with a concave ring in threaded connection with the convex ring, and the top end of the spring is abutted and attached to the bottom surface of the annular block; during operation, when the pretightening force of the spring to the valve core needs to be adjusted, the annular block is screwed at the moment, the depth of the convex ring in the concave ring is controlled, the total length of the valve core and the annular block can be effectively adjusted, the compression length of the spring is controlled, the pretightening force of the spring to the valve ball can be reasonably adjusted according to the working condition of the expansion valve, and the expansion valve can work more effectively and stably.

Preferably, the side walls of the limiting columns are respectively and rotatably connected with a group of uniformly distributed rolling balls along the height direction of the side walls, and the side walls of the rolling balls are respectively attached to the side walls of the corresponding limiting grooves; during operation, through set up the spin of laminating mutually with spacing groove on spacing post for relative motion can take place through roll and spacing post on the spin in the spacing groove, reduces the lateral wall of spacing groove and spacing post and leads to the too big or the condition of wearing and tearing of friction because of laminating completely, thereby has further improved the operating mass with life of expansion valve.

Preferably, the bottom end of the spring is connected with an annular bottom plate, and the bottom surface of the bottom plate is rotatably connected with a group of annularly and uniformly distributed balls; the during operation, when moving the disk seat and making it install when the valve body is inside through twisting, the disk seat can exert certain torque force to extruded spring bottom rotating this moment to make the spring take place to warp easily and influence its effective use, through setting up the bottom plate in the spring bottom this moment, when the disk seat rotated, the bottom plate can be through the rotation of ball change the disk seat and to the applied torque force of spring this moment, thereby make the spring can more stabilize effectual carry out work.

Preferably, a gap is formed between the side wall of the valve core and the side wall of the sliding cavity, a sealing ring is fixedly connected to the side wall of the valve core, and the sealing ring is in interference fit with the sliding cavity; during operation, the clearance that sets up between case and the sliding cavity can effectual reduction friction between the two and wearing and tearing, and the sealing washer that lies in between the two simultaneously can carry out effectual sealing to the clearance between case and the sliding cavity, prevents that the valve ball from leading to the condition that refrigerant flowed into from the clearance and pushes away the groove because of wearing and tearing or work badly appear, has further improved expansion valve stability and validity at the during operation.

Preferably, the bottom end of the valve ball is fixedly connected with a threaded rod, and the middle part of the top surface of the valve core is fixedly connected with a threaded sleeve in threaded fit with the threaded rod; during operation, through screwing up the threaded rod inside the thread bush for the valve ball can be stable link firmly on case top, when wearing and tearing appear or during bad work as the valve ball simultaneously, only need with the threaded rod this moment from the thread bush inside screw out and more renew the valve ball can, make things convenient for the maintenance of expansion valve, reduced the use cost of expansion valve simultaneously.

Preferably, the side walls of the openings at the bottom ends of the limit grooves are respectively provided with an inclined guide surface; during operation, the bottom opening of the limiting groove is gradually enlarged from inside to outside through the arranged guide surface, so that the limiting column can be clamped with the limiting groove easily and rapidly, and the rapidness of the expansion valve during installation is further improved.

The invention has the following beneficial effects:

1. the expansion valve has the advantages that the internal structure of the expansion valve is arranged, the radial rotation of the valve body in the up-and-down movement process is effectively prevented, the internal structure of the valve body is simpler, the processing and the production are easier, and the production cost of the expansion valve is greatly reduced.

2. According to the invention, the rolling ball which is attached to the limiting groove is arranged on the limiting column, so that the limiting groove can move relative to the limiting column by rolling on the rolling ball, and the condition of excessive friction or abrasion caused by complete attachment of the limiting groove and the side wall of the limiting column is reduced, thereby further improving the working quality and prolonging the service life of the expansion valve.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 2;

in the figure: the valve comprises a valve body 1, a valve core 2, a refrigerant inlet 3, a refrigerant outlet 4, a valve ball 5, a sliding cavity 6, a pushing groove 7, a diaphragm 8, a push rod 9, a through groove 10, a valve seat 11, a limiting column 12, a limiting groove 13, a spring 14, a flow channel 15, an arc-shaped groove 16, an arc-shaped plate 17, an elastic block 18, a communication hole 19, a first magnetic block 20, a second magnetic block 21, an annular block 22, a convex ring 23, a concave ring 24, a rolling ball 25, a bottom plate 26, a rolling ball 27, a sealing ring 28, a threaded rod 29, a threaded sleeve 30 and a guide surface 31.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the following embodiments.

As shown in fig. 1-4, the vibration-damping noise-reducing expansion valve for the air conditioner of the automobile comprises a valve body 1 and a valve core 2 positioned inside the valve body 1, wherein a refrigerant inlet 3 and a refrigerant outlet 4 are respectively arranged at the bottom end and the top end of the valve body 1, and the top of the valve core 2 is fixedly connected with a valve ball 5; a sliding cavity 6 is arranged inside the valve body 1, the shape of the valve core 2 is matched with the sliding cavity 6 and is connected with the sliding cavity in a sliding way, a push groove 7 communicated with the sliding cavity 6 is arranged in the top end of the valve body 1, the side end of the push groove 7 is communicated with the refrigerant outlet 4, a diaphragm 8 is arranged in the valve body 1 at the top end of the valve core 2, a push rod 9 is arranged on the diaphragm 8, the bottom end of the push rod 9 penetrates through the push groove 7 and is positioned at the top of the valve ball 5, a group of through grooves 10 which are annularly and uniformly distributed are arranged in the valve core 2 along the axial direction, the inner wall of the refrigerant inlet 3 is in threaded connection with a valve seat 11, the middle part of the top surface of the valve seat 11 is fixedly connected with a limit column 12 with a polygonal cross section, a limiting groove 13 matched with the limiting column 12 is formed in the middle of the bottom surface of the valve core 2, a spring 14 is movably arranged between the valve core 2 and the valve seat 11, and a flow channel 15 is formed in the valve seat 11; during operation, although the expansion valve in the prior art can realize the effect of radially limiting the movement of the valve core 2, the problem of complex structure of the valve core 2 and the inner cavity of the valve body 1 also exists, so that the production cost of the expansion valve is increased, and the processing difficulty is increased; when the vibration-damping noise-reducing automobile air-conditioning expansion valve is used, when the valve core 2 is installed, the valve core 2 is firstly inserted into the sliding cavity 6, then the limiting column 12 on the valve seat 11 is inserted into the limiting groove 13 in advance, then the valve seat 11 is screwed, so that the valve seat 11 drives the valve core 2 to synchronously rotate through the limiting column 12 and is assembled on the valve body 1 when rotating, meanwhile, the valve seat 11 is screwed into the valve body 1 and can apply pressure on the spring 14, so that the spring 14 can extrude the valve core 2 and drive the valve ball 5 to block the bottom end of the push groove 7, when the expansion valve works, the diaphragm 8 overcomes the elasticity of the spring 14 to drive the push rod 9 to slide towards the bottom end of the push groove 7, so that the push rod 9 can push the valve ball 5 and the valve core 2 downwards and the valve ball 5 can not block the push groove 7 any more, and then refrigerant flows into the sliding cavity 6 through the flow passage 15 on the valve seat 11, and flows out of the expansion valve from the refrigerant outlet 4 through the through groove 10 and the push groove 7; and at the in-process of valve body 1 up-and-down motion, spacing groove 13 on the valve body 1 slides for spacing post 12, spacing post 12 can play effectual spacing effect to spacing groove 13 lateral wall this moment, thereby prevent that valve body 1 from taking place radial pivoted condition at the in-process of up-and-down motion, it is spacing to case 2 through setting up spacing groove 13 and spacing post 12 matched with form simultaneously, make the inside structure of valve body 1 simpler, and change in processing production, thereby greatly reduced the manufacturing cost of expansion valve.

As an embodiment of the invention, an arc-shaped groove 16 communicated with a through groove 10 is arranged in the valve core 2, an arc-shaped plate 17 is connected in the arc-shaped groove 16 in a sliding manner, an elastic block 18 is connected between one end of the arc-shaped plate 17 and the end part of the arc-shaped groove 16, communication holes 19 matched with the through grooves 10 one by one are arranged on the arc-shaped plate 17, a first magnetic block 20 is arranged on the outer wall of the valve body 1, a second magnetic block 21 is embedded at the position of the arc-shaped plate 17 close to the first magnetic block 20, and the magnetic poles of the ends of the first magnetic block 20 and the second magnetic block 21 close to each other are the same; when the expansion valve works, when the expansion valve is in a non-working state, the arc-shaped plate 17 seals the through groove 10 under the action of the elastic block 18, the through groove 10 is in a closed state at the moment, and the condition that a refrigerant flows from the through groove 10 to the push groove 7 when the surface of the valve ball 5 is worn or poorly sealed is prevented, so that the expansion valve works more stably, when the expansion valve is in a working state, the valve core 2 moves downwards under the action of the push rod 9 at the moment, the arc-shaped plate 17 gradually approaches the first magnetic block 20, the first magnetic block 20 can gradually apply repulsive force to the second magnetic block 21, the arc-shaped plate 17 rotates in the arc-shaped groove 16, when one end of the arc-shaped plate 17 far away from the elastic block 18 is attached to the side wall of the arc-shaped groove 16, the communication hole 19 on the arc-shaped plate 17 can be respectively aligned and communicated with the through groove 10 at the moment, so that the through groove 10 is in an open state, thereby the work of the expansion valve can be smoothly and effectively carried out.

As an embodiment of the invention, the bottom end of the valve core 2 is provided with an annular block 22, the top surface of the annular block 22 is provided with a convex ring 23, the bottom surface of the valve core 2 is provided with a concave ring 24 in threaded connection with the convex ring 23, and the top end of the spring 14 is abutted against and attached to the bottom surface of the annular block 22; during operation, when the pretightening force of the spring 14 on the valve core 2 needs to be adjusted, the annular block 22 is screwed at the moment, and the depth of the convex ring 23 in the concave ring 24 is controlled, so that the total length of the valve core 2 and the annular block 22 can be effectively adjusted, the compression length of the spring 14 is controlled, the pretightening force of the spring 14 on the valve ball 5 can be reasonably adjusted according to the working condition of the expansion valve, and the expansion valve can work more effectively and stably.

As an embodiment of the present invention, a set of uniformly distributed rolling balls 25 are respectively rotatably connected to the side walls of the limiting posts 12 along the height direction thereof, and the side walls of the rolling balls 25 are respectively attached to the side walls of the corresponding limiting grooves 13; during operation, through set up the spin 25 of laminating mutually with spacing groove 13 on spacing post 12 for spacing groove 13 can take place relative motion through roll and spacing post 12 on spin 25, reduces the lateral wall of spacing groove 13 and spacing post 12 and leads to the condition of friction too big or wearing and tearing because of laminating completely, thereby has further improved the operating mass with life of expansion valve.

As an embodiment of the present invention, the bottom end of the spring 14 is connected with an annular bottom plate 26, and a group of balls 27 which are uniformly distributed in an annular shape is rotatably connected to the bottom surface of the bottom plate 26; during operation, when the valve seat 11 is screwed and installed inside the valve body 1, the valve seat 11 can apply a certain torque force to the bottom end of the extruded spring 14 during rotation, so that the spring 14 is easy to deform and the effective use of the spring is affected, at the moment, the bottom plate 26 is arranged at the bottom of the spring 14, when the valve seat 11 rotates, the bottom plate 26 can change the torque force applied to the spring 14 by the valve seat 11 through the rotation of the ball 27, and therefore the spring 14 can work more stably and effectively.

As an embodiment of the present invention, a gap is provided between the side wall of the valve core 2 and the side wall of the sliding cavity 6, and the side wall of the valve core 2 is fixedly connected with a sealing ring 28, and the sealing ring 28 is in interference fit with the sliding cavity 6; during operation, the clearance that sets up between case 2 and the sliding cavity 6 can effectual reduction friction and the wearing and tearing between the two, and the sealing washer 28 that lies in between the two simultaneously can carry out effectual sealing to the clearance between case 2 and the sliding cavity 6, prevents that valve ball 5 from leading to the condition that refrigerant flows into thrust groove 7 from the clearance because of wearing and tearing or work badly appear, has further improved expansion valve stability and validity at the during operation.

As an embodiment of the invention, the bottom end of the valve ball 5 is fixedly connected with a threaded rod 29, and the middle part of the top surface of the valve core 2 is fixedly connected with a threaded sleeve 30 which is in threaded fit with the threaded rod 29; during operation, through screwing up threaded rod 29 inside thread bush 30 for valve ball 5 can be stable link firmly on 2 tops of case, when wearing and tearing appear or during bad work in valve ball 5 simultaneously, only need at this moment with threaded rod 29 from the inside screw bush 30 screw out and change new valve ball 5 can, make things convenient for the maintenance of expansion valve, reduced the use cost of expansion valve simultaneously.

As an embodiment of the present invention, the side walls of the bottom opening of the limiting groove 13 are respectively provided with an inclined guiding surface 31; during operation, the bottom opening of the limiting groove 13 is gradually enlarged from inside to outside by the arranged guide surface 31, so that the limiting column 12 can be clamped with the limiting groove 13 easily and quickly, and the rapidity of installing the expansion valve is further improved.

In operation, when the valve core 2 is installed, the valve core 2 is firstly inserted into the sliding cavity 6, then the limiting post 12 on the valve seat 11 is inserted into the limiting groove 13 in advance, then the valve seat 11 is screwed, so that the valve seat 11 is assembled on the valve body 1 when the valve core 2 is driven by the limit post 12 to synchronously rotate during rotation, meanwhile, the valve seat 11 is screwed into the valve body 1 and can apply pressure to the spring 14, so that the spring 14 can extrude the valve core 2 and drive the valve ball 5 to block the bottom end of the push groove 7, when the expansion valve works, the diaphragm 8 overcomes the elasticity of the spring 14 at the moment to drive the push rod 9 to slide towards the bottom end of the push groove 7, the push rod 9 can push the valve ball 5 and the valve core 2 downwards and make the valve ball 5 not block the push groove 7 any more, and then the refrigerant flows into the sliding cavity 6 from the flow passage 15 on the valve seat 11 and flows out of the expansion valve from the refrigerant outlet 4 through the through groove 10 and the push groove 7; and at the in-process of valve body 1 up-and-down motion, spacing groove 13 on the valve body 1 slides for spacing post 12, spacing post 12 can play effectual spacing effect to spacing groove 13 lateral wall this moment, thereby prevent that valve body 1 from taking place radial pivoted condition at the in-process of up-and-down motion, it is spacing to case 2 through setting up spacing groove 13 and spacing post 12 matched with form simultaneously, make the inside structure of valve body 1 simpler, and change in processing production, thereby greatly reduced the manufacturing cost of expansion valve.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A vibration and noise reduction automobile air conditioner expansion valve comprises a valve body (1) and a valve core (2) positioned inside the valve body (1), wherein a refrigerant inlet (3) and a refrigerant outlet (4) are respectively arranged at the bottom end and the top end of the valve body (1); the method is characterized in that: the top of the valve core (2) is fixedly connected with a valve ball (5); a sliding cavity (6) is formed in the valve body (1), the valve core (2) is matched with the sliding cavity (6) in shape and is connected with the sliding cavity in a sliding mode, a pushing groove (7) communicated with the sliding cavity (6) is formed in the top end of the valve body (1), the side end of the pushing groove (7) is communicated with a refrigerant outlet (4), a diaphragm (8) is arranged in the valve body (1) at the top end of the valve core (2), a push rod (9) is installed on the diaphragm (8), the bottom end of the push rod (9) penetrates through the pushing groove (7) and is located at the top of a valve ball (5), a group of through grooves (10) which are uniformly distributed in an annular mode are formed in the valve core (2) along the axial direction of the valve core, a valve seat (11) is connected to the inner wall of the refrigerant inlet (3) in a threaded mode, a limiting column (12) with a polygonal cross section is fixedly connected to the middle of the top face of the valve seat (11), a limiting groove (13) matched with the limiting column (12) is formed in the middle of the bottom face of the valve core (2), a spring (14) is movably arranged between the valve core (2) and the valve seat (11), and a flow channel (15) is formed in the valve seat (11); an arc-shaped groove (16) communicated with the through groove (10) is formed in the valve core (2), an arc-shaped plate (17) is connected to the inside of the arc-shaped groove (16) in a sliding mode, an elastic block (18) is connected to one end of the arc-shaped plate (17) and the end portion of the arc-shaped groove (16), communication holes (19) matched with the through grooves (10) one by one are formed in the arc-shaped plate (17), a first magnetic block (20) is arranged on the outer wall of the valve body (1), a second magnetic block (21) is embedded in the position, close to the first magnetic block (20), of the arc-shaped plate (17), and the magnetic poles of one ends, close to each other, of the first magnetic block (20) and the second magnetic block (21) are the same; the bottom end of the valve core (2) is provided with an annular block (22), a convex ring (23) is arranged on the top surface of the annular block (22), a concave ring (24) connected with the convex ring (23) in a threaded manner is arranged on the bottom surface of the valve core (2), and the top end of the spring (14) is abutted and attached to the bottom surface of the annular block (22).

2. A vibration and noise reducing automotive air conditioning expansion valve according to claim 1; the method is characterized in that: the side wall of the limiting column (12) is respectively and rotatably connected with a group of rolling balls (25) which are uniformly distributed along the height direction of the side wall, and the side walls of the rolling balls (25) are respectively attached to the side walls of the corresponding limiting grooves (13).

3. A vibration and noise reducing automotive air conditioning expansion valve according to claim 1; the method is characterized in that: the bottom end of the spring (14) is connected with an annular bottom plate (26), and a group of annular uniformly distributed balls (27) are rotatably connected to the bottom surface of the bottom plate (26).

4. A vibration and noise reducing automotive air conditioning expansion valve according to claim 1; the method is characterized in that: a gap is formed between the side wall of the valve core (2) and the side wall of the sliding cavity (6), a sealing ring (28) is fixedly connected to the side wall of the valve core (2), and the sealing ring (28) is in interference fit with the sliding cavity (6).

5. A vibration and noise reducing automotive air conditioning expansion valve according to claim 1; the method is characterized in that: the bottom end of the valve ball (5) is fixedly connected with a threaded rod (29), and the middle of the top surface of the valve core (2) is fixedly connected with a threaded sleeve (30) in threaded fit with the threaded rod (29).

6. A vibration and noise reduction automotive air conditioning expansion valve according to claim 2; the method is characterized in that: the side walls of the bottom end openings of the limiting grooves (13) are respectively provided with an inclined guide surface (31).