Electronic expansion valve

Abstract

The present invention provides an electronic expansion valve, comprising: a valve body, the valve body having a valve port; a valve head, movably arranged in the valve body, the valve head including a valve head and a compression sleeve, the valve head having a receiving cavity, the end of the receiving cavity close to the valve port having a bottom wall, the bottom wall having a through hole, the valve head being used to block the valve port; a guide sleeve, arranged in the valve body, the valve head being inserted in the guide sleeve; a driving part, movably arranged in the valve body, the end of the driving part passing through the compression sleeve, the end of the driving part and the compression sleeve having a channel, the channel, the receiving cavity and the through hole jointly forming a balancing channel passing through the valve head; an elastic member, arranged in the receiving cavity, one end of the elastic member cooperating with the bottom wall, the other end of the elastic member being able to be compressed by the end of the driving part; a sealing member, the sealing member being arranged between the valve head and the guide sleeve. The technical solution provided by the present invention can solve the problems of high manufacturing cost and large size of electronic expansion valves in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to an electronic expansion valve. Background Art

[0002] In the existing electronic expansion valve, the connection structure between the valve head and the screw is complex, so the processing process is cumbersome and the manufacturing cost is high; and the valve head and the screw are both relatively long, and in order to ensure the life and strength of the product, they cannot be made thinner and finer. Therefore, the overall size of the current electronic expansion valve cannot be further compressed, which does not conform to the miniaturization development trend of the product. Summary of the invention

[0003] The present invention provides an electronic expansion valve to solve the problems of high manufacturing cost and large size of the electronic expansion valve in the prior art.

[0004] In order to solve the above problems, the present invention provides an electronic expansion valve, comprising: a valve body, the valve body having a valve port; a valve head, movably arranged in the valve body, the valve head comprising a valve head and a pressing sleeve, the valve head having an accommodating cavity, the end of the accommodating cavity close to the valve port having a bottom wall, the bottom wall being provided with a through hole, the valve head being used to block the valve port; a guide sleeve, arranged in the valve body, the valve head being inserted into the guide sleeve; a driving part, movably arranged in the valve body, the end of the driving part passing through the pressing sleeve, the end of the driving part and the pressing sleeve being provided with a channel, the channel, the accommodating cavity and the through hole jointly forming a balancing channel passing through the valve head; an elastic member, arranged in the accommodating cavity, one end of the elastic member cooperating with the bottom wall, the other end of the elastic member being able to be compressed by the end of the driving part; a sealing member, the sealing member being arranged between the valve head and the guide sleeve.

[0005] Furthermore, the driving part includes a rod-shaped member and a valve sleeve. The rod-shaped member can move axially. The end of the rod-shaped member is connected to the valve sleeve. The valve sleeve cooperates with one end of the valve head away from the valve port. The other end of the elastic member abuts against the valve sleeve.

[0006] Furthermore, the valve sleeve is fixed to the end of the rod-shaped member, the outer peripheral surface of the valve sleeve has a first limiting step, and the other end of the elastic member abuts against the first limiting step.

[0007] Furthermore, one end of the valve head away from the valve port has an opening communicated with the accommodating cavity, the pressing sleeve is arranged at the opening, and the valve sleeve abuts against the pressing sleeve.

[0008] Furthermore, the rod-shaped member passes through the pressing sleeve, the outer peripheral surface of the pressing sleeve has a second limiting step, a part of the pressing sleeve is passed through the accommodating cavity, and the end surface of the valve head abuts against the second limiting step.

[0009] Furthermore, a first avoidance hole is provided between the inner wall of the valve sleeve and the rod-shaped member, a second avoidance hole is provided between the inner wall of the pressure sleeve and the rod-shaped member, the first avoidance hole and the second avoidance hole form a channel, and the through hole, the accommodating cavity, the first avoidance hole and the second avoidance hole are connected in sequence.

[0010] Furthermore, the rod-shaped member includes a first rod segment and a second rod segment which are connected to each other, the cross-sectional area of ​​the second rod segment is smaller than the cross-sectional area of ​​the first rod segment, the second rod segment is inserted into the pressing sleeve and the valve sleeve, a first avoidance hole is provided between the inner wall of the valve sleeve and the second rod segment, and a second avoidance hole is provided between the inner wall of the pressing sleeve and the second rod segment.

[0011] Furthermore, the radial cross section of the second rod segment is arcuate.

[0012] Furthermore, the driving part has an external thread, and the electronic expansion valve also includes: a nut assembly, the nut assembly has an internal thread, and the external thread matches the internal thread.

[0013] Furthermore, the length of the end of the driving portion penetrating into the valve head portion is less than or equal to half the length of the valve head portion.

[0014] By applying the technical solution of the present invention, the valve head can be driven to move by the driving part to block or open the valve port through the valve head, and the elastic member can apply a force to the valve head to improve the sealing when blocking the valve port. Since the end of the driving part cooperates with the end of the valve head away from the valve port, and the elastic member is located between the end of the driving part and the bottom wall of the accommodating cavity of the valve head, the length of the valve head and the driving part can be reduced, and the structure can be simplified, thereby simplifying the processing steps, reducing the processing difficulty, and reducing the manufacturing cost of the electronic expansion valve. Moreover, a balancing channel running through the valve head is formed by the channel formed by the end of the driving part and the cavity in the compression sleeve, the accommodating cavity, and the through hole of the valve head, so that the pressure balance can be maintained in the areas at both ends of the valve head, and the product size can be made smaller. The valve head can be guided by the guide sleeve, and the sealing can be improved by the sealing member to avoid internal leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A cross-sectional view of an electronic expansion valve provided by an embodiment of the present invention is shown;

[0017] Figure 2 Shows Figure 1 A three-dimensional diagram of an electronic expansion valve;

[0018] Figure 3 Shows Figure 1Schematic diagram of the structure of some parts.

[0019] The above drawings include the following reference numerals:

[0020] 10. Valve body; 11. Valve port; 21. Valve head; 211. Through hole; 22. Press sleeve; 221. Second avoidance hole; 31. Rod-shaped member; 311. First rod segment; 312. Second rod segment; 32. Valve sleeve; 321. First avoidance hole; 40. Elastic member; 50. Nut assembly; 60. Guide sleeve; 71. First cavity; 72. Second cavity; 80. Sealing member. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention provides an electronic expansion valve, including: a valve body 10, the valve body 10 has a valve port 11; a valve head, movably arranged in the valve body 10, the valve head includes a valve head 21 and a pressing sleeve 22, the valve head 21 has a accommodating cavity, the end of the accommodating cavity close to the valve port 11 has a bottom wall, the bottom wall is provided with a through hole 211, and the valve head 21 is used to block the valve port 11; a driving part, movably arranged in the valve body 10, the end of the driving part passes through the pressing sleeve 22, the end of the driving part and the pressing sleeve 22 are provided with a channel, the channel, the accommodating cavity and the through hole 211 together form a balancing channel passing through the valve head; an elastic member 40, arranged in the accommodating cavity, one end of the elastic member 40 cooperates with the bottom wall, and the other end of the elastic member 40 can be compressed by the end of the driving part.

[0023] By applying the technical solution of this embodiment, the valve head can be driven to move by the driving part, so as to block or open the valve port 11 of the valve body 10 through the valve head 21, and the elastic member 40 can apply a force to the valve head to improve the sealing performance when blocking the valve port. Since the end of the driving part cooperates with the end of the valve head away from the valve port 11, and the elastic member 40 is located between the end of the driving part and the bottom wall of the accommodating cavity of the valve head, the length of the valve head and the driving part can be reduced, and the structure can be simplified, thereby simplifying the processing steps, reducing the processing difficulty, and reducing the manufacturing cost of the electronic expansion valve. Moreover, a balancing channel is formed through the end of the driving part and the cavity in the compression sleeve 22, the accommodating cavity of the valve head 21, and the through hole 211 of the valve head 21, so that the pressure balance can be maintained in the areas at both ends of the valve head, and the product size can be made smaller. By setting the balancing channel, the fluid pressure in the areas at both ends of the valve head can be consistent, so that when the valve head blocks the valve port 11, the poor sealing caused by the pressure difference on both sides of the valve head can be avoided. Moreover, this facilitates opening of the valve port 11 .

[0024] The electronic expansion valve further comprises: a guide sleeve 60, which is arranged in the valve body 10, and the valve head is inserted into the guide sleeve 60. The valve head 21 can be guided by the guide sleeve 60.

[0025] In this embodiment, the electronic expansion valve further includes a sealing member 80, which is disposed between the valve head and the guide sleeve 60. The sealing member 80 can improve the sealing performance and prevent internal leakage. Specifically, an annular groove is provided on the inner wall of the guide sleeve 60, and an annular sealing member 80 is provided in the annular groove. The outer wall of the valve head 21 can be sealed by the annular sealing member 80 to ensure the sealing performance of the electronic expansion valve.

[0026] In this embodiment, the length of the end of the driving part inserted into the valve head portion is less than or equal to half the length of the valve head portion, which can reduce the length of the driving part and facilitate processing.

[0027] In this embodiment, the valve head 21 is cylindrical and the accommodating cavity is in the shape of a circular hole, which makes the valve head 21 simple in structure and convenient for processing and assembly with related parts.

[0028] In this embodiment, the driving part includes a rod-shaped member 31 and a valve sleeve 32. The rod-shaped member 31 can move axially. The end of the rod-shaped member 31 is connected to the valve sleeve 32. The valve sleeve 32 cooperates with one end of the valve head away from the valve port 11. The other end of the elastic member 40 abuts against the valve sleeve 32. In this way, the movement of the rod-shaped member 31 can drive the movement of the valve sleeve 32. When the valve sleeve 32 moves toward the direction close to the valve port 11, it can drive the valve head to move to block the valve port 11. When the valve sleeve 32 moves away from the valve port 11, it can drive the valve head to move to open the valve port 11.

[0029] like Figure 1 As shown, the valve sleeve 32 is fixed to the end of the rod-shaped member 31, and the outer peripheral surface of the valve sleeve 32 has a first limiting step, and the other end of the elastic member 40 abuts against the first limiting step. The elastic member 40 can be positioned and limited by the first limiting step. Moreover, the valve sleeve 32 can avoid direct contact between the rod-shaped member 31 and the elastic member 40, thereby reducing the wear of the rod-shaped member 31. Specifically, the valve sleeve 32 can be connected to the end of the rod-shaped member 31 by laser welding, which is easy to process and has a firm connection. In this embodiment, the elastic member 40 can be set as a spring.

[0030] The adoption of the above technical solution can not only simplify the structure of the electronic expansion valve, but also reduce the axial size of the driving part and the overall length of the electronic expansion valve, thereby making the structure of the electronic expansion valve more compact and miniaturized.

[0031] In this embodiment, one end of the valve head 21 away from the valve port 11 has an opening communicating with the accommodating cavity, the pressing sleeve 22 is arranged at the opening, and the valve sleeve 32 abuts against the pressing sleeve 22. In this way, the valve sleeve 32 can be limited by the pressing sleeve 22, so that when the valve sleeve 32 moves away from the valve port 11 under the drive of the rod-shaped member 31, the valve head is driven to move.

[0032] Specifically, the front end of the rod-shaped member 31 is passed through the pressing sleeve 22, the outer peripheral surface of the pressing sleeve 22 has a second limiting step, a part of the pressing sleeve 22 is passed through the accommodating cavity, and the end face of the valve head 21 abuts against the second limiting step. In this way, the pressing sleeve 22 and the valve head 21 can be limitedly assembled through the second limiting step, which is convenient for positioning and assembling the pressing sleeve 22 and the valve head 21. Preferably, the pressing sleeve 22 and the valve head 21 can be connected by laser welding, which is convenient for operation and has a firm connection. Specifically, the second limiting step includes a narrow portion that passes through the accommodating cavity and a wide portion that abuts against the upper end face of the valve head 21.

[0033] Specifically, in this embodiment, there is a first avoidance hole 321 between the inner wall of the valve sleeve 32 and the rod-shaped member 31, and there is a second avoidance hole 221 between the inner wall of the pressure sleeve 22 and the rod-shaped member 31, and the first avoidance hole 321 and the second avoidance hole 221 together form the above-mentioned channel. The through hole 211, the accommodating cavity, the first avoidance hole 321 and the second avoidance hole 221 are connected in sequence. In this way, a balanced channel can be formed by the through hole 211, the accommodating cavity, the first avoidance hole 321 and the second avoidance hole 221, so that the areas at both ends of the valve head are connected. In the above manner, the holes on the valve sleeve 32 and the pressure sleeve 22 can be used, which is convenient for processing. In this embodiment, the valve head 21 is cylindrical, and there is a stepped hole in the valve head 21, wherein the hole with a larger diameter forms the accommodating cavity, and the hole with a smaller diameter forms the through hole 211. In this way, the structure of the valve head 21 can be simplified, and the valve sleeve 32 and the pressure sleeve 22 are also convenient for processing and assembly.

[0034] In this embodiment, the rod-shaped member 31 includes a first rod segment 311 and a second rod segment 312 connected to each other. In the axial direction, the cross-sectional area of ​​the second rod segment 312 is smaller than the cross-sectional area of ​​the first rod segment 311. In this embodiment, the cross-sectional area of ​​the first rod segment 311 in the axial direction is circular, and the second rod segment 312 is a part of the first rod segment 311 cut off, and the cross-sectional area in the axial direction is arched. The second rod segment 312 is inserted into the pressing sleeve 22 and the valve sleeve 32, and the first avoidance hole 321 is provided between the inner wall of the valve sleeve 32 and the second rod segment 312, and the second avoidance hole 221 is provided between the inner wall of the pressing sleeve 22 and the second rod segment 312. During processing, an integrally formed rod can be used as the rod-shaped member 31, and a part is cut off from one end of the rod-shaped member 31 in the axial direction to produce the second rod segment 312, which is convenient for processing and has low manufacturing cost.

[0035] In other embodiments not shown, the cross section of the second rod segment 312 may also be a sector of any area or other irregular shapes, and preferably the cross section is smaller than the first rod segment 311. Of course, the cross section of the second rod segment 312 may also be larger than the cross section of the first rod segment 311, as long as a gap is formed between the second rod segment 312 and the pressing sleeve 22 and the valve sleeve 32, the purpose of this solution can be achieved.

[0036] In this embodiment, the lower end of the second rod section 312 has a third limiting step, the end surface of the third limiting step is flush with the end surface of the pressing sleeve 22, and the end surface of the valve sleeve 32 abuts against the end surface of the third limiting step. This facilitates the positioning and assembly of the second rod section 312, the pressing sleeve 22 and the valve sleeve 32. The valve sleeve 32 is fixedly mounted on the third limiting step and moves with the movement of the rod-shaped member 31. When the valve sleeve 32 moves upward to the position of the pressing sleeve 22, it can drive the valve head 21 fixed to the pressing sleeve 22 to move upward to open the valve port 11.

[0037] Furthermore, in this embodiment, the radial cross section of the second rod segment 312 is arc-shaped, which facilitates the processing of the second rod segment 312. In order to ensure the structural strength of the second rod segment 312, the radial cross section of the second rod segment 312 can be set to a major arc.

[0038] In this embodiment, the driving part has an external thread, and the electronic expansion valve further includes: a nut assembly 50, the nut assembly 50 has an internal thread, and the external thread cooperates with the internal thread. In this embodiment, the electronic expansion valve further includes a magnetic rotor, which can drive the driving part to rotate, and the driving part can move axially through the thread cooperation between the driving part and the nut assembly 50, thereby driving the valve head to move. Specifically, the external thread is located on the rod-shaped member 31.

[0039] like Figure 3As shown, the area between the guide sleeve 60, the rod-shaped member 31, the pressing sleeve 22 and the nut assembly 50 is the first cavity 71, and the part where the hole where the valve port 11 is located below the valve head 21 is the second cavity 72. The first cavity 71 and the second cavity 72 can be connected through the through hole 211, the accommodating cavity, the first avoidance hole 321 and the second avoidance hole 221.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body (10), wherein the valve body (10) has a valve port (11); a valve head portion, movably arranged in the valve body (10), the valve head portion comprising a valve head (21) and a pressing sleeve (22), the valve head (21) having an accommodating cavity, an end of the accommodating cavity close to the valve port (11) having a bottom wall, the bottom wall being provided with a through hole (211), the valve head (21) being used for blocking the valve port (11); A guide sleeve (60) is arranged in the valve body (10), and the valve head is inserted into the guide sleeve (60); A driving part is movably arranged in the valve body (10), an end of the driving part passes through the pressing sleeve (22), a channel is provided on the end of the driving part and the pressing sleeve (22), and the channel, the accommodating cavity and the through hole (211) together form a balancing channel that passes through the valve head; An elastic member (40) is arranged in the accommodating cavity, one end of the elastic member (40) cooperates with the bottom wall, and the other end of the elastic member (40) can be compressed by the end of the driving part; A sealing member (80), wherein the sealing member (80) is disposed between the valve head and the guide sleeve (60); A magnetic rotor drives the driving part to rotate.

2. The electronic expansion valve according to claim 1, characterized in that: The driving part comprises a rod-shaped member (31) and a valve sleeve (32); the rod-shaped member (31) is capable of axial movement; an end of the rod-shaped member (31) is connected to the valve sleeve (32); the valve sleeve (32) cooperates with an end of the valve head portion away from the valve port (11); and the other end of the elastic member (40) abuts against the valve sleeve (32).

3. The electronic expansion valve according to claim 2, characterized in that: The valve sleeve (32) is fixed to the end of the rod-shaped member (31); the outer peripheral surface of the valve sleeve (32) has a first limiting step, and the other end of the elastic member (40) abuts against the first limiting step.

4. The electronic expansion valve according to claim 2, characterized in that: One end of the valve head (21) away from the valve port (11) has an opening communicating with the accommodating cavity, the pressing sleeve (22) is arranged at the opening, and the valve sleeve (32) abuts against the pressing sleeve (22).

5. The electronic expansion valve according to claim 4, characterized in that: The rod-shaped member (31) passes through the pressing sleeve (22), the outer peripheral surface of the pressing sleeve (22) has a second limiting step, a part of the pressing sleeve (22) passes through the accommodating cavity, and the end surface of the valve head (21) abuts against the second limiting step.

6. The electronic expansion valve according to claim 2, characterized in that: A first avoidance hole (321) is provided between the inner wall of the valve sleeve (32) and the rod-shaped member (31), and a second avoidance hole (221) is provided between the inner wall of the pressing sleeve (22) and the rod-shaped member (31). The first avoidance hole (321) and the second avoidance hole (221) form the passage, and the through hole (211), the accommodating cavity, the first avoidance hole (321) and the second avoidance hole (221) are connected in sequence.

7. The electronic expansion valve according to claim 6, characterized in that: The rod-shaped member (31) comprises a first rod segment (311) and a second rod segment (312) which are connected to each other, the cross-sectional area of ​​the second rod segment (312) is smaller than the cross-sectional area of ​​the first rod segment (311), the second rod segment (312) is inserted into the pressing sleeve (22) and the valve sleeve (32), the first avoidance hole (321) is provided between the inner wall of the valve sleeve (32) and the second rod segment (312), and the second avoidance hole (221) is provided between the inner wall of the pressing sleeve (22) and the second rod segment (312).

8. The electronic expansion valve according to claim 7, characterized in that: The radial cross section of the second rod segment (312) is arcuate.

9. The electronic expansion valve according to claim 1, characterized in that: The driving part has an external thread, and the electronic expansion valve further includes: A nut assembly (50) having an internal thread, wherein the external thread cooperates with the internal thread.

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: The length of the end of the driving portion inserted into the valve head portion is less than or equal to half of the length of the valve head portion.

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