CN111828713A

CN111828713A - Electronic expansion valve

Info

Publication number: CN111828713A
Application number: CN201910329710.1A
Authority: CN
Inventors: 龙江军; 许学飞; 贺宇辰
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-10-27

Abstract

The invention provides an electronic expansion valve, comprising: the valve comprises a valve body, a rotor, a rotating sleeve, a transmission sleeve and a driving rod, wherein the rotor is sleeved on the outer peripheral surface of the rotating sleeve, the rotor can drive the rotating sleeve to rotate in the valve body, and the transmission sleeve is axially movably arranged in the rotating sleeve; the rotating sleeve is provided with a first internal thread, the transmission sleeve is provided with a first external thread and a second internal thread, and the driving rod is provided with a second external thread, wherein the first internal thread is connected with the first external thread in a matched mode, and the second internal thread is connected with the second external thread in a matched mode; the rotating sleeve can drive the transmission sleeve to axially move when rotating, and the transmission sleeve can drive the driving rod to axially move when axially moving. Through the technical scheme provided by the invention, the shaking of parts of the electronic expansion valve during the action can be reduced, the noise is reduced, and the service life is prolonged.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve.

Background

In the existing electronic expansion valve, a ceramic tile is welded with a screw rod into a whole through a connecting plate, the screw rod and a nut seat are in threaded fit transmission, and the threads are designed to be in clearance fit. The rotor drives the screw rod to rotate together in the rotating process, and because the rotor drives the in-process atress inequality and there is the clearance between screw rod and the nut, the rotor can have and rock, then can produce the collision noise this moment.

Disclosure of Invention

The invention provides an electronic expansion valve, which aims to solve the problem that the electronic expansion valve in the prior art is high in noise during action.

In order to solve the above problems, the present invention provides an electronic expansion valve, comprising: the valve comprises a valve body, a rotor, a rotating sleeve, a transmission sleeve and a driving rod, wherein the rotor is sleeved on the outer peripheral surface of the rotating sleeve, the rotor can drive the rotating sleeve to rotate in the valve body, and the transmission sleeve is axially movably arranged in the rotating sleeve; the rotating sleeve is provided with a first internal thread, the transmission sleeve is provided with a first external thread and a second internal thread, and the driving rod is provided with a second external thread, wherein the first internal thread is connected with the first external thread in a matched mode, and the second internal thread is connected with the second external thread in a matched mode; the rotating sleeve can drive the transmission sleeve to axially move when rotating, and the transmission sleeve can drive the driving rod to axially move when axially moving.

Further, the rotating sleeve comprises a cylindrical part and a limiting ring arranged on the outer peripheral surface of the cylindrical part, the rotor is sleeved on the cylindrical part, the end surface of the rotor is abutted to the limiting ring, and the first internal thread is located in the cylindrical part.

Further, the rotating sleeve further comprises: the first limiting block is arranged on the end face of the limiting ring and is used for being matched with the groove on the end face of the rotor so as to prevent the rotor and the rotating sleeve from rotating relatively; and/or the second limiting block is arranged in the cylindrical part and positioned on the moving path of the transmission sleeve, and the second limiting block is used for limiting the axial moving distance of the transmission sleeve.

Further, the electronic expansion valve further includes: and one end of the thrust bearing is abutted against the limiting ring, and the other end of the thrust bearing is abutted against the inner wall of the valve body.

Furthermore, the rotating sleeve is provided with a limiting hole, one end of the driving rod, which is far away from the valve port of the valve body, penetrates through the limiting hole in an axially movable manner, the limiting hole is used for preventing the driving rod and the rotating sleeve from rotating relatively, the rotating sleeve can drive the driving rod to rotate in the transmission sleeve, and the driving rod can axially move relative to the transmission sleeve through thread fit when rotating.

Further, the rotating sleeve comprises a cylindrical part and a sliding sleeve fixedly arranged in the cylindrical part, the limiting hole is located in the sliding sleeve, the rotor is fixedly arranged on the outer circumference of the cylindrical part, and the first internal thread is located in the cylindrical part.

Furthermore, the transmission sleeve comprises a sleeve body and a third limiting block arranged at one end of the sleeve body, the first external thread and the second internal thread are both located on the sleeve body, and the third limiting block is used for limiting the axial movement distance of the transmission sleeve.

Further, the electronic expansion valve further includes: the limiting part is arranged in the valve body and used for limiting the circumferential direction of the transmission sleeve so as to prevent the transmission sleeve from rotating.

Furthermore, a first limiting plane is arranged on the outer wall of the transmission sleeve, the limiting part is fixedly arranged in the valve body, the limiting part is provided with a second limiting plane, and the first limiting plane is matched with the second limiting plane.

Furthermore, the transmission sleeve comprises a sleeve body, the sleeve body comprises a first sleeve section and a second sleeve section which are connected with each other, the outer diameter of the first sleeve section is larger than that of the second sleeve section, the first external thread and the second internal thread are both positioned on the first sleeve section, and the first limiting plane is positioned on the outer walls of the first sleeve section and the second sleeve section; the limiting part comprises a ring-shaped part and a limiting plate connected with the ring-shaped part, the second limiting plane is located on the limiting plate, and the second sleeve section can penetrate through the ring-shaped part.

Further, an accommodating cavity is formed in one end, close to the valve port of the valve body, of the driving rod, and the electronic expansion valve further comprises: a resilient assembly at least partially disposed within the receiving cavity; the end of the valve needle is connected with the end of the driving rod, the valve needle can axially move relative to the driving rod within a limited range, and the elastic component is abutted to the end of the valve needle.

Further, the elastic component comprises a spring, a sliding block and a ball body which are connected in sequence, wherein the spring is abutted against the bottom of the cavity of the accommodating cavity, and the ball body is abutted against the valve needle.

Further, the slider includes interconnect's first shaft segment and second shaft segment, and the diameter of first shaft segment is less than the diameter of second shaft segment, and first shaft segment wears to establish in the spring, second shaft segment and spring butt, and the terminal surface of second shaft segment has with the first spacing groove of the spacing cooperation of spheroid, the terminal surface of needle have with the spacing complex second spacing groove of spheroid.

Further, the actuating lever includes interconnect's screw rod section and tube-shape section, and the second external screw thread is located the screw rod section, holds the chamber and is located the screw rod section, and the installation cavity of tube-shape section with hold the chamber intercommunication, the tip of needle is movably to be set up in the installation cavity, the terminal surface of screw rod section be used for with the terminal surface backstop cooperation of needle.

Further, the needle includes the needle body and sets up the backstop ring on the outer circumference of needle body, and the one end and the backstop ring of needle body are located the installation cavity, and electronic expansion valve still includes: the stop collar is fixedly arranged at one end, close to the valve port, of the cylindrical section, the needle body is arranged in the stop collar in a penetrating mode, and the end face of the stop collar is in limit fit with the stop ring.

Further, the external diameter of tube-shape section is greater than the external diameter of screw rod section, and the driving sleeve has first hole and the second hole of intercommunication each other, and the diameter of second hole is greater than the diameter of first hole, and the second internal thread is located first hole, and the second hole is used for dodging the tube-shape section.

By applying the technical scheme of the invention, the valve body, the rotor, the rotating sleeve, the transmission sleeve and the driving rod are arranged in the electronic expansion valve, the rotor can drive the rotating sleeve to rotate when rotating, the rotating sleeve is in threaded connection with the transmission sleeve, and the transmission sleeve is in threaded connection with the driving rod, so that the rotating sleeve can drive the transmission sleeve to axially move when rotating, the transmission sleeve can drive the driving rod to axially move when axially moving, and the driving rod can drive the valve needle to move to open or close the valve port. Through the arrangement, the rotor and the driving rod are not directly connected, the driving rod is not easy to be transmitted to the rotor even if the driving rod swings when moving, and the rotating sleeve limits the rotor, so that the swinging of the rotor can be reduced, the collision between the rotor and the valve body or other parts is reduced or lightened, and the noise is reduced. Through this technical scheme, can reduce the rocking of electronic expansion valve spare part when the action, the noise reduction to improve life.

Through the technical scheme of the invention, the superposition of two motions is realized to enable the driving rod to axially move, namely, the driving rod can be driven to axially move by the axial motion of the transmission sleeve, and the axial motion of the driving rod can also be realized by the rotation between the driving rod and the transmission sleeve. Therefore, the axial movement speed and distance of the driving rod can be conveniently controlled, products with various strokes can be adjusted by changing the thread pitch and the screwing direction of the threads, the manufacturing is convenient, and the manufacturing cost is reduced; the elastic component is arranged in the accommodating cavity of the driving rod, so that the electronic expansion valve is compact in structure, the arrangement of the elastic component is also beneficial to reducing resistance and abrasion, and the arrangement of a transmission sleeve and other parts is convenient, so that the interference is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a cross-sectional view of an electronic expansion valve provided by an embodiment of the present invention;

fig. 2 shows another cross-sectional view of the electronic expansion valve of fig. 1;

FIG. 3 is a schematic view showing the construction of the rotating sleeve of FIG. 1;

FIG. 4 shows a cross-sectional view of the rotating sleeve of FIG. 3;

FIG. 5 shows a schematic structural view of the driving sleeve of FIG. 1;

fig. 6 shows a schematic structural diagram of the limiting member in fig. 1.

Wherein the figures include the following reference numerals:

10. a valve body; 11. a valve port; 20. a rotor; 30. rotating the sleeve; 31. a tubular member; 32. a limiting ring; 33. a first stopper; 34. a second limiting block; 35. a sliding sleeve; 40. a transmission sleeve; 41. a sleeve body; 411. a first jacket segment; 412. a second jacket segment; 42. a third limiting block; 43. a first limit plane; 44. a first inner bore; 45. a second inner bore; 50. a drive rod; 51. a screw section; 52. a barrel section; 61. a thrust bearing; 62. a limiting sleeve; 70. a limiting member; 71. a second limit plane; 72. an annular member; 73. a limiting plate; 80. an elastic component; 81. a spring; 82. a slider; 83. a sphere; 90. a valve needle; 91. a needle body; 92. a stop ring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, an embodiment of the present invention provides an electronic expansion valve, including: the valve comprises a valve body 10, a rotor 20, a rotating sleeve 30, a transmission sleeve 40 and a driving rod 50, wherein the rotor 20 is sleeved on the outer peripheral surface of the rotating sleeve 30, the rotor 20 can drive the rotating sleeve 30 to rotate in the valve body 10, and the transmission sleeve 40 is axially movably arranged in the rotating sleeve 30; the rotating sleeve 30 is provided with a first internal thread, the transmission sleeve 40 is provided with a first external thread and a second internal thread, and the driving rod 50 is provided with a second external thread, wherein the first internal thread is in fit connection with the first external thread, and the second internal thread is in fit connection with the second external thread; the rotating sleeve 30 can drive the driving sleeve 40 to move axially when rotating, and the driving sleeve 40 can drive the driving rod 50 to move axially when moving axially.

By applying the technical scheme of the embodiment, the valve body 10, the rotor 20, the rotating sleeve 30, the transmission sleeve 40 and the driving rod 50 are arranged in the electronic expansion valve, the rotor 20 can drive the rotating sleeve 30 to rotate when rotating, because the rotating sleeve 30 is in threaded connection with the transmission sleeve 40, and the transmission sleeve 40 is in threaded connection with the driving rod 50, the rotating sleeve 30 can drive the transmission sleeve 40 to axially move when rotating, the transmission sleeve 40 can drive the driving rod 50 to axially move when axially moving, and then the driving rod 50 can drive the valve needle 90 to move to open or close the valve port 11. Through the arrangement, the rotor 20 is not directly connected with the driving rod 50, and the driving rod 50 is not easy to be transmitted to the rotor 20 even if shaking is generated during moving, so that the shaking of the rotor 20 can be reduced, the collision between the rotor 20 and the valve body 10 or other parts is reduced or lightened, and the noise is reduced. Through this technical scheme, can reduce the rocking of electronic expansion valve spare part when the action, the noise reduction to improve life.

In this embodiment, the rotating sleeve 30 includes a cylindrical member 31 and a stopper ring 32 provided on an outer peripheral surface of the cylindrical member 31, the rotor 20 is fitted over the cylindrical member 31, an end surface of the rotor 20 abuts against the stopper ring 32, and the first internal thread is located inside the cylindrical member 31. The axial direction of the rotor 20 can be restricted by the stopper ring 32. Specifically, the retainer rings 32 may be provided in two, with the rotor 20 being located between the two retainer rings 32. In production, the rotor 20 can be manufactured by magnetic powder injection molding and connected to the cylinder 31.

As shown in fig. 3 and 4, the rotating sleeve 30 further includes: the first limiting block 33 is arranged on the end face of the limiting ring 32, and the first limiting block 33 is used for being matched with the groove on the end face of the rotor 20 so as to prevent the rotor 20 and the rotating sleeve 30 from rotating relatively; and/or the second stopper 34 is arranged in the barrel-shaped member 31 and located on a moving path of the transmission sleeve 40, and the second stopper 34 is used for limiting the axial moving distance of the transmission sleeve 40. The first limit block 33 is matched with the groove on the rotor 20 to limit the circumferential direction of the rotating sleeve 30, so that the rotor 20 drives the rotating sleeve 30 to rotate. The second stopper 34 can limit the axial moving distance of the driving sleeve 40 and can also control the moving distance of the driving rod 50.

In this embodiment, the electronic expansion valve further includes: and one end of the thrust bearing 61 is abutted against the limit ring 32, and the other end of the thrust bearing 61 is abutted against the inner wall of the valve body 10. The thrust bearing 61 can reduce the resistance of the rotor 20 and the rotating sleeve 30 during rotation, avoid abrasion, enable the rotor 20 and the rotating sleeve 30 to rotate smoothly and reduce noise.

In this embodiment, the rotating sleeve 30 has a limiting hole, one end of the driving rod 50, which is far away from the valve port 11 of the valve body 10, penetrates through the limiting hole in an axially movable manner, the limiting hole is used for preventing the driving rod 50 and the rotating sleeve 30 from rotating relatively, the rotating sleeve 30 can drive the driving rod 50 to rotate in the transmission sleeve 40, and the driving rod 50 can axially move relative to the transmission sleeve 40 through a threaded fit when rotating. So configured, rotation of the rotating sleeve 30 causes rotation of the drive rod 50 within the drive sleeve 40, and axial movement of the drive rod 50 is likewise caused by the threaded engagement of the drive rod 50 with the drive sleeve 40.

With the above arrangement, the two motions can be superimposed to axially move the driving rod 50, that is, the axial motion of the transmission sleeve 40 can drive the driving rod 50 to axially move, and the rotation between the driving rod 50 and the transmission sleeve 40 can also realize the axial motion of the driving rod 50. This facilitates control of the axial speed and distance of movement of the drive rod 50.

Specifically, when the first external thread of the transmission sleeve 40 and the second external thread of the driving rod 50 are opposite in rotation direction, the axial movement direction of the transmission sleeve 40 and the axial movement direction of the driving rod 50 relative to the transmission sleeve 40 are the same, so that the movement speed of the driving rod 50 can be increased; when the first external thread of the driving sleeve 40 and the second external thread of the driving rod 50 are rotated in the same direction, the axial movement direction of the driving sleeve 40 and the axial movement direction of the driving rod 50 relative to the driving sleeve 40 are opposite, so that the movement speed of the driving rod 50 can be reduced. For example, the pitch of the first external thread is 0.6mm, the pitch of the second external thread is 0.5mm, when the two are rotated in opposite directions, the stroke of the driving rod 50 and the needle 90 is 1.1mm, and when the two are rotated in the same direction, the stroke of the driving rod 50 and the needle 90 is 0.1 mm.

By adopting the scheme, products with various strokes can be adjusted by changing the thread pitch and the screwing direction of the threads, so that the manufacturing is convenient, and the manufacturing cost is reduced. For example, it can be used to design a conventional 500-step direct-acting expansion valve, and also can be used to design a 2000-step deceleration expansion valve.

In the present embodiment, the rotating sleeve 30 includes a cylinder 31 and a sliding sleeve 35 fixedly disposed in the cylinder 31, the limiting hole is located in the sliding sleeve 35, the rotor 20 is fixedly disposed on the outer circumference of the cylinder 31, and the first internal thread is located in the cylinder 31. The abrasion of the driving rod 50 can be reduced through the sliding sleeve 35, and the service life is prolonged. The limiting hole can be a square hole or other holes with limiting surfaces.

As shown in fig. 5, the transmission sleeve 40 includes a sleeve body 41 and a third limiting block 42 disposed at one end of the sleeve body 41, the first external thread and the second internal thread are both located on the sleeve body 41, and the third limiting block 42 is used for limiting an axial moving distance of the transmission sleeve 40. The third limiting block 42 is used for limiting the axial moving distance of the transmission sleeve 40 and the driving rod 50.

In this embodiment, the electronic expansion valve further includes: the limiting member 70, the limiting member 70 is disposed in the valve body 10, and the limiting member 70 is used for limiting the circumferential direction of the transmission sleeve 40 to prevent the transmission sleeve 40 from rotating. The stop member 70 prevents the driving sleeve 40 from rotating in the valve body 10 to achieve linear movement.

Specifically, the outer wall of the transmission sleeve 40 has a first limiting plane 43, the limiting member 70 is fixedly disposed in the valve body 10, the limiting member 70 has a second limiting plane 71, and the first limiting plane 43 is matched with the second limiting plane 71. Therefore, the transmission sleeve 40 can be limited and guided by matching the first limiting plane 43 with the second limiting plane 71, so that the transmission sleeve 40 can move stably, and the shaking is reduced.

As shown in fig. 6, the driving sleeve 40 includes a sleeve body 41, the sleeve body 41 includes a first sleeve section 411 and a second sleeve section 412 connected to each other, an outer diameter of the first sleeve section 411 is larger than an outer diameter of the second sleeve section 412, both the first external thread and the second internal thread are located on the first sleeve section 411, and the first limit plane 43 is located on an outer wall of the first sleeve section 411 and the second sleeve section 412; the limiting member 70 comprises a ring-shaped member 72 and a limiting plate 73 connected with the ring-shaped member 72, the second limiting plane 71 is located on the limiting plate 73, and the second sleeve section 412 can penetrate into the ring-shaped member 72. With the above arrangement, when the driving sleeve 40 moves towards the direction close to the position-limiting member 70, the second sleeve section 412 can be inserted into the annular member 72, so that the length of the electronic expansion valve can be reduced while the axial movement distance of the driving sleeve 40 is ensured, the structure of the electronic expansion valve is compact, and the material consumption can be reduced. The number of the limiting plates 73 may be two, and the transmission sleeve 40 is sandwiched between the two limiting plates 73.

As shown in fig. 1 and 2, an end of the driving rod 50 adjacent to the valve port 11 of the valve body 10 has a receiving cavity therein, and the electronic expansion valve further includes: a resilient member 80 disposed at least partially within the receiving cavity; a needle 90, an end portion of the needle 90 being connected with an end portion of the driving rod 50, the needle 90 being axially movable within a limited range with respect to the driving rod 50, the resilient member 80 abutting against the end portion of the needle 90. The elastic component 80 can apply a force to the valve needle 90 to improve the sealing performance when the valve port 11 is blocked. The elastic member 80 is disposed in the receiving cavity of the driving rod 50, so that the electronic expansion valve can be made compact. And, the arrangement of the driving sleeve 40 is convenient, and the interference is avoided.

Specifically, the elastic assembly 80 includes a spring 81, a slider 82 and a ball 83 connected in sequence, wherein the spring 81 abuts against the bottom of the accommodating cavity, and the ball 83 abuts against the valve needle 90. The slide block 82 and the ball 83 are arranged to prevent the spring 81 from directly contacting the valve needle 90, thereby reducing resistance. In use, the drive rod 50 and the valve needle 90 are relatively rotatable, and resistance and wear to relative rotation is reduced by the ball 83.

Specifically, the slider 82 includes interconnect's first shaft segment and second shaft segment, and the diameter of first shaft segment is less than the diameter of second shaft segment, and first shaft segment wears to establish in spring 81, second shaft segment and spring 81 butt, and the terminal surface of second shaft segment has the first spacing groove of spacing cooperation with spheroid 83, and the terminal surface of needle 90 has the second spacing groove of spacing cooperation with spheroid 83. With the above arrangement, contact of the spring 81 with the side wall of the accommodation chamber can be avoided or reduced, thereby reducing resistance and wear. The first and second limiting grooves limit the position of the ball 83, facilitate positioning and assembly, and reduce wear between the ball 83 and the slider 82 or the needle 90.

As shown in fig. 1 and 2, the driving rod 50 includes a screw section 51 and a barrel section 52 connected to each other, the second external thread is located on the screw section 51, the accommodating cavity is located in the screw section 51, the mounting cavity of the barrel section 52 is communicated with the accommodating cavity, the end of the needle 90 is movably disposed in the mounting cavity, and the end face of the screw section 51 is used for being in stop fit with the end face of the needle 90. Through the above-mentioned structural arrangement, the connection of the valve needle 90 and the driving rod 50 is facilitated, and the end surface of the screw section 51 can also limit the moving distance of the valve needle 90.

Further, the valve needle 90 includes a needle body 91 and a stop ring 92 disposed on an outer circumference of the needle body 91, one end of the needle body 91 and the stop ring 92 are located in the installation cavity, and the electronic expansion valve further includes: the limiting sleeve 62 is fixedly arranged at one end of the cylindrical section 52 close to the valve port 11, the needle body 91 is arranged in the limiting sleeve 62 in a penetrating manner, and the end surface of the limiting sleeve 62 is in limiting fit with the stop ring 92. In this way, the end surface of the stop sleeve 62 cooperates with the stop ring 92 to limit the movement direction of the valve needle 90 away from the drive rod 50. Specifically, the stop collar 62 has a stepped structure on its outer peripheral surface, and the stepped structure is in limit fit with the end surface of the cylindrical section 52, so that the assembly and position limitation are facilitated.

In this embodiment, the cylindrical section 52 has an outer diameter larger than that of the screw section 51, the driving sleeve 40 has a first inner hole 44 and a second inner hole 45 which are communicated with each other, the diameter of the second inner hole 45 is larger than that of the first inner hole 44, the second inner thread is located in the first inner hole 44, and the second inner hole 45 is used for avoiding the cylindrical section 52. Through the arrangement, when the transmission sleeve 40 and the driving rod 50 move relatively, the cylindrical section 52 can penetrate into the second inner hole 45 of the transmission sleeve 40, so that the electronic expansion valve is compact in structure and the overall length is reduced on the premise of ensuring the moving distance.

Through the technical scheme of the invention, the following technical effects can be realized: the rotor 20 and the driving rod 50 are not directly connected, and even if the driving rod 50 shakes during movement, the shaking of the rotor 20 is not easy to transfer to, so that the shaking of the rotor 20 can be reduced, the collision between the rotor 20 and the valve body 10 or other parts is reduced or lightened, the noise is reduced, and the service life can be prolonged; a superposition of the two movements is achieved to axially move the driving rod 50, i.e. an axial movement of the driving sleeve 40 can bring about an axial movement of the driving rod 50, and a rotation between the driving rod 50 and the driving sleeve 40 can also achieve an axial movement of the driving rod 50. Therefore, the axial movement speed and distance of the driving rod 50 can be conveniently controlled, products with various strokes can be adjusted by changing the thread pitch and the screwing direction of the threads, the manufacturing is convenient, and the manufacturing cost is reduced; the elastic assembly 80 is disposed in the accommodating cavity of the driving rod 50, so that the electronic expansion valve is compact in structure, the arrangement of the elastic assembly 80 is also beneficial to reducing resistance and abrasion, and the arrangement of the transmission sleeve 40 and other parts is convenient, so that interference is avoided.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

the valve comprises a valve body (10), a rotor (20), a rotating sleeve (30), a transmission sleeve (40) and a driving rod (50), wherein the rotor (20) is sleeved on the outer peripheral surface of the rotating sleeve (30), the rotor (20) can drive the rotating sleeve (30) to rotate in the valve body (10), and the transmission sleeve (40) is axially movably arranged in the rotating sleeve (30);

the rotating sleeve (30) is provided with a first internal thread, the transmission sleeve (40) is provided with a first external thread and a second internal thread, and the driving rod (50) is provided with a second external thread, wherein the first internal thread is in fit connection with the first external thread, and the second internal thread is in fit connection with the second external thread;

the rotating sleeve (30) can drive the transmission sleeve (40) to axially move when rotating, and the transmission sleeve (40) can drive the driving rod (50) to axially move when axially moving.

2. An electronic expansion valve according to claim 1, wherein the rotary sleeve (30) comprises a cylindrical member (31) and a stopper ring (32) provided on an outer peripheral surface of the cylindrical member (31), the rotor (20) is fitted over the cylindrical member (31), an end surface of the rotor (20) abuts against the stopper ring (32), and the first internal thread is located in the cylindrical member (31).

3. An electronic expansion valve according to claim 2, wherein the rotating sleeve (30) further comprises:

the first limiting block (33) is arranged on the end face of the limiting ring (32), and the first limiting block (33) is used for being matched with a groove on the end face of the rotor (20) so as to prevent the rotor (20) and the rotating sleeve (30) from rotating relatively; and/or the presence of a gas in the gas,

the second limiting block (34) is arranged in the cylindrical part (31) and located on a moving path of the transmission sleeve (40), and the second limiting block (34) is used for limiting the axial moving distance of the transmission sleeve (40).

4. The electronic expansion valve of claim 2, further comprising:

and one end of the thrust bearing (61) is abutted to the limit ring (32), and the other end of the thrust bearing (61) is abutted to the inner wall of the valve body (10).

5. The electronic expansion valve according to claim 1, wherein the rotating sleeve (30) has a limiting hole, an end of the driving rod (50) away from the valve port (11) of the valve body (10) is axially movably inserted into the limiting hole, the limiting hole is used for preventing the driving rod (50) and the rotating sleeve (30) from rotating relatively, the rotating sleeve (30) can drive the driving rod (50) to rotate in the transmission sleeve (40), and the driving rod (50) can axially move relative to the transmission sleeve (40) through a threaded fit when rotating.

6. An electronic expansion valve according to claim 5, wherein the rotary sleeve (30) comprises a cylindrical member (31) and a sliding sleeve (35) fixedly arranged within the cylindrical member (31), the limiting hole is located within the sliding sleeve (35), the rotor (20) is fixedly arranged on the outer circumference of the cylindrical member (31), and the first internal thread is located within the cylindrical member (31).

7. The electronic expansion valve according to claim 1, wherein the driving sleeve (40) comprises a sleeve body (41) and a third limiting block (42) disposed at one end of the sleeve body (41), the first external thread and the second internal thread are both located on the sleeve body (41), and the third limiting block (42) is configured to limit an axial moving distance of the driving sleeve (40).

8. The electronic expansion valve of claim 1, further comprising:

the limiting piece (70), the limiting piece (70) sets up in valve body (10), limiting piece (70) are used for carrying on spacingly in order to prevent the rotation of drive sleeve (40) to the circumference of drive sleeve (40).

9. An electronic expansion valve according to claim 8, wherein the driving sleeve (40) has a first position-limiting plane (43) on its outer wall, the position-limiting member (70) is fixedly disposed in the valve body (10), the position-limiting member (70) has a second position-limiting plane (71), and the first position-limiting plane (43) is engaged with the second position-limiting plane (71).

10. The electronic expansion valve of claim 9,

the transmission sleeve (40) comprises a sleeve body (41), the sleeve body (41) comprises a first sleeve section (411) and a second sleeve section (412) which are connected with each other, the outer diameter of the first sleeve section (411) is larger than that of the second sleeve section (412), the first external thread and the second internal thread are both positioned on the first sleeve section (411), and the first limiting plane (43) is positioned on the outer walls of the first sleeve section (411) and the second sleeve section (412);

the limiting member (70) comprises a ring-shaped member (72) and a limiting plate (73) connected with the ring-shaped member (72), the second limiting plane (71) is located on the limiting plate (73), and the second sleeve section (412) can penetrate into the ring-shaped member (72).

11. The electronic expansion valve according to claim 1, wherein an end of the driving rod (50) adjacent to the valve port (11) of the valve body (10) has a receiving cavity therein, the electronic expansion valve further comprising:

a resilient assembly (80) disposed at least partially within the receiving cavity;

a valve needle (90), wherein the end part of the valve needle (90) is connected with the end part of the driving rod (50), the valve needle (90) can axially move relative to the driving rod (50) within a limited range, and the elastic component (80) is abutted with the end part of the valve needle (90).

12. An electronic expansion valve according to claim 11, wherein the resilient member (80) comprises a spring (81), a slider (82) and a ball (83) connected in sequence, wherein the spring (81) abuts the bottom of the receiving chamber and the ball (83) abuts the valve needle (90).

13. An electronic expansion valve according to claim 12, wherein the slider (82) comprises a first shaft section and a second shaft section which are connected with each other, the diameter of the first shaft section is smaller than that of the second shaft section, the first shaft section is arranged in the spring (81) in a penetrating manner, the second shaft section is abutted against the spring (81), the end surface of the second shaft section is provided with a first limit groove which is in limit fit with the ball (83), and the end surface of the valve needle (90) is provided with a second limit groove which is in limit fit with the ball (83).

14. An electronic expansion valve according to claim 11, wherein the driving rod (50) comprises a screw section (51) and a barrel section (52) connected to each other, the second external thread is located on the screw section (51), the accommodating chamber is located in the screw section (51), a mounting chamber of the barrel section (52) communicates with the accommodating chamber, an end portion of the valve needle (90) is movably disposed in the mounting chamber, and an end face of the screw section (51) is adapted to cooperate with an end face stop of the valve needle (90).

15. The electronic expansion valve of claim 14, wherein the valve needle (90) comprises a needle body (91) and a stop ring (92) disposed on an outer circumference of the needle body (91), wherein one end of the needle body (91) and the stop ring (92) are located in the mounting cavity, the electronic expansion valve further comprising:

the limiting sleeve (62) is fixedly arranged at one end, close to the valve port (11), of the cylindrical section (52), the needle body (91) penetrates through the limiting sleeve (62), and the end face of the limiting sleeve (62) is in limiting fit with the stop ring (92).

16. An electronic expansion valve according to claim 14, wherein the cylindrical section (52) has an outer diameter larger than that of the screw section (51), the driving sleeve (40) has a first inner hole (44) and a second inner hole (45) which are communicated with each other, the diameter of the second inner hole (45) is larger than that of the first inner hole (44), the second inner thread is located in the first inner hole (44), and the second inner hole (45) is used for avoiding the cylindrical section (52).