Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve. The electronic expansion valve comprises a valve body, a coil electric control assembly, a valve element assembly, a waterproof ring and a screw assembly. The valve element assembly comprises a sleeve, a rotor assembly, a valve needle component, a nut assembly and a valve seat assembly. The nut assembly comprises a nut body, a stop ring and a stop block. The nut main body is provided with a guide slide rail groove and a lower stop part, and can be matched with the stop ring to freely rotate; the stop block is matched with the top of the nut body and is fixed to the top of the nut body through a buckle structure or in a welding mode. The stop block is also provided with an upper stop part; and the up-and-down operation interval of the stop ring can be limited through the up-and-down stop part. The integrated injection molding of the guide slide rail reduces the influence of poor control precision caused by deformation of a spring guide rail in the original design, and the split structural design of the stop block can avoid the ring jumping problem caused by deformation of the stop ring, so that the moving reliability of the stop ring on the guide slide rail groove is ensured, and the reliability of the nut structure is ensured.

Description

Technical Field

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

[0002] The electronic expansion valve is used in air conditioning and refrigeration systems. The electronic expansion valve includes a sleeve, a rotor assembly, a valve needle component, a nut assembly and a valve seat assembly. The stop structure of the nut assembly cooperates with the stop rod of the rotor assembly to achieve throttling control of the electronic expansion valve. Therefore, designing a reliable stop structure to ensure the operating accuracy of the electronic expansion valve is a technical issue.

[0003] However, the accuracy and stability of the nut assembly stopping the rotor assembly are determined by the stop ring and the spring guide rail, and the stop ring and the spring guide rail are easily deformed by external influences, which further affects the movement accuracy of the electronic expansion valve.

[0004] Therefore, it is necessary to optimize the design of the stop structure of the existing electronic expansion valve to solve the above technical problems. Summary of the invention

[0005] The purpose of the embodiment of the present application is to provide an electronic expansion valve, which uses a new nut assembly solution. The nut structure has a guide rail groove, which reduces the impact of the deterioration of control accuracy caused by the deformation of the spring guide rail; the spiral portion of the stop ring limits the number of turns, the size of the tail cone angle and the range of the interval, which is beneficial to the installation and screwing of the stop ring, and can also ensure that the stop ring runs stably in the guide rail groove, avoiding the problem of ring jumping due to too few turns, and has little effect on the total stroke, avoiding further restrictions on the valve opening interval by the mechanical structure, ensuring the reliability of the movement of the stop ring on the guide rail groove, and ensuring the reliability of the nut structure.

[0006] The embodiment of the present application provides an electronic expansion valve, including a coil electronic control assembly, a valve core assembly, a valve body, a waterproof ring and a screw assembly; the valve core assembly is directly connected to the valve body through threads, the coil electronic control assembly is fixed to the valve body through a connecting pressure plate and connected through a screw assembly, and the waterproof ring is arranged between the coil electronic control assembly and the valve core assembly through a groove below the coil electronic control assembly; the coil electronic control assembly includes a coil injection molded part, a circuit board assembly, a cover plate and a connecting pressure plate; the connecting pressure plate and the coil injection molded part are fixed together by welding, the circuit board assembly is electrically connected to the coil injection molded part through a pin, and the cover plate and the coil injection molded part are welded to protect the circuit board assembly in the coil sealing cavity; the valve core assembly includes a metal sleeve, a rotor assembly, a valve needle component, a nut assembly and a valve seat assembly; the nut assembly and the valve needle The components are threaded together and then welded to the valve seat assembly, the rotor assembly is fixedly connected to the valve needle component by welding, the metal sleeve is welded to the valve seat assembly and the rotor assembly, the valve needle component and the nut assembly are sleeved therein; the rotor assembly includes a permanent magnet rotor and a stop rod; the nut assembly includes a nut body, a stop ring and a stop block, the nut body includes a guide slide rail groove, a lower stop portion and a stop block mounting portion; the stop ring is provided with a stop portion and a spiral portion; the stop block is provided with a nut mating mounting portion and an upper stop portion; the stop ring is sleeved in the guide slide rail groove and can rotate freely therein, and the stop ring is stopped by the lower stop portion; the stop block is matched with the top of the nut body and fixed on the nut body, and the upper stop portion is used to stop the stop ring.

[0007] Further, the stop ring is provided with a stop part and a spiral part, the spiral part spirally moves up and down in the guide rail groove in the nut body, the stop ring diameter is recorded as D, the stop ring line diameter is d, the tail end outward expansion size is a, the tail end of the spiral part in the stop ring is provided with an outward expansion protrusion, the protrusion distance is recorded as a, D / 2<(D / 2+a)≤(D / 2+2 / d)the number of turns in the outward expansion interval of the tail end of the spiral part is recorded as b, the total number of turns is n, 0 turns<b≤n / 2 turns; 1<n<2. The stop part cooperates with the stop rod in the rotor assembly.

[0008] Furthermore, the outer peripheral surface of the nut body has two oppositely arranged demolding planes, and the demolding planes are parallel to the axis of the nut body. The guide slide rail groove is arranged on the outer peripheral surface of the nut body between the two demolding planes. The maximum distance between the two demolding planes is L, and the minimum diameter of the spiral guide slide rail groove is d1, L>(d1-0.3)mm.

[0009] Furthermore, the nut body and the stop block cooperate in the following manner:

[0010] The nut body is provided with a protruding truncated cone, and the stop block cooperates with the protruding truncated cone;

[0011] Or the nut body is provided with an inner concave circular hole, and the stop block is provided with a protruding truncated cone to cooperate with the inner concave circular hole;

[0012] Or the nut body is provided with a fan-shaped installation groove, and the stop block is provided with a fan-shaped protruding block to cooperate with the fan-shaped protruding block.

[0013] Furthermore, the stop block is provided with a nut matching installation portion in the form of a straight groove, and the nut body is provided with a stop block matching installation portion in the form of a straight protrusion that matches therewith.

[0014] Furthermore, a snap-fit ​​mounting portion is provided on both the stop block matching mounting portion of the nut body and the nut matching mounting portion of the stop block, and the stop block and the nut body are fixed together by snap-fitting or welding.

[0015] Furthermore, in the nut assembly, the stop ring is sleeved in the guide slide groove of the nut body and stopped by the lower stop part at the bottom of the guide slide groove, and then the stop block is fixed to the stop block mounting part at the upper end of the nut body by welding, and the stop block is provided with an upper stop part and a stopping ring.

[0016] Furthermore, in the valve core assembly, the rotor assembly and the valve needle component are connected by welding, and the stop rod of the rotor assembly cooperates with the stop portion of the stop ring in the nut assembly to control the up and down movement of the valve needle component; the valve needle component cooperates with the valve seat assembly to form a refrigerant circulation portion, and the cross-sectional area of ​​the refrigerant circulation portion is changed by the up and down movement of the valve needle component.

[0017] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0018] It can be seen from the above embodiments that the new type of nut assembly solution used in the present application, the nut structure has its own guide slide groove, which reduces the impact of the control accuracy deterioration caused by the deformation of the spring guide rail; the spiral portion of the retaining ring limits its number of turns, the size of the tail cone angle and its interval range, which is beneficial to the installation and screwing of the retaining ring, and can also ensure that the retaining ring runs stably in the guide slide groove, avoiding the problem of ring jumping due to too few turns, and has little impact on the total stroke, avoiding further restrictions on the valve opening range by the mechanical structure, ensuring the reliability of the movement of the retaining ring on the guide slide groove, and ensuring the reliability of the nut structure.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an electronic expansion valve according to the present invention;

[0022] Figure 2 This is a front view of an electronic expansion valve according to the present invention;

[0023] Figure 3 The three-dimensional front views of three assembly modes of a nut assembly in an electronic expansion valve according to the present invention, wherein (a) is an assembly mode in which a protruding truncated cone is provided on the nut body, (b) is an assembly mode in which a concave circular hole is provided on the nut body, and (c) is an assembly mode in which a fan-shaped mounting groove is provided on the nut body;

[0024] Figure 4 A schematic diagram of two oppositely disposed demoulding planes on the outer peripheral surface of a nut body in an electronic expansion valve according to the present invention;

[0025] Figure 5 A three-dimensional front view of a stop ring in an electronic expansion valve according to the present invention;

[0026] Figure 6 A schematic diagram of the dimensions of a stop ring in an electronic expansion valve according to the present invention;

[0027] Figure 7 The three-dimensional front views of the stopper blocks in different assembly modes in the electronic expansion valve of the present invention, wherein (a) is a stopper block assembled by welding, and (b) is a stopper block assembled by snap-fitting;

[0028] Figure 8 It is a three-dimensional schematic diagram of the cooperation of a valve needle component, a nut assembly and a stop rod in an electronic expansion valve described in the present invention.

[0029] 1. Coil electronic control assembly; 2. Valve core assembly; 3. Valve body; 4. Waterproof ring; 5. Screw assembly; 11. Coil injection molding; 12. Circuit board assembly; 13. Cover plate; 14. Connecting plate; 21. Refrigerant circulation part; 31. Metal sleeve; 32. Rotor assembly; 33. Valve needle component; 34. Nut assembly; 35. Valve seat assembly; 41. Nut body; 42. Stop ring; 43. Stop block; 51. Guide slide groove; 52. Demolding plane; 53. Lower stop part; 54. Stop block matching installation part; 55. Stop block snap-on installation part; 61. Stop part; 62. Spiral part; 63. Nut matching installation part; 64. Upper stop part; 65. Stop block welding rib; 66. Nut snap-on installation part; 71. Permanent magnet rotor; 72. Stop rod. DETAILED DESCRIPTION

[0030] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0031] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0032] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0033] like Figure 1 , Figure 2 and Figure 3As shown, the electronic expansion valve provided in the present application includes a coil electronic control assembly 1, a valve core assembly 2, a valve body 3, a waterproof ring 4 and a screw assembly 5; the valve core assembly 2 is directly connected to the valve body 3 through threads, the coil electronic control assembly 1 is fixed to the valve body 3 through a connecting pressure plate 14 and connected through the screw assembly 5, and the waterproof ring 4 is arranged between the coil electronic control assembly 1 and the valve core assembly 2 through a groove below the coil electronic control assembly 1; the coil electronic control assembly 1 includes a coil injection molded part 11, a circuit board assembly 12, a cover plate 13 and a connecting pressure plate 14; the connecting pressure plate 14 and the coil injection molded part 11 are fixed together by welding, the circuit board assembly 12 and the coil injection molded part 11 are electrically connected together, and the cover plate 13 and the coil injection molded part 11 are welded to protect the circuit board assembly 12 in the coil sealing cavity; the valve core assembly 2 includes a metal sleeve 31, a rotor assembly 32, a valve needle component 33, and a nut assembly 34 and a valve seat assembly 35; the valve needle component 33 and the nut assembly 34 are threadedly connected together and then welded to the valve seat assembly 35, the rotor assembly 32 and the valve needle component 33 are fixedly connected by welding, the metal sleeve 31 is welded to the valve seat assembly 35 and the rotor assembly 32, the valve needle component 33 and the nut assembly 34 are sleeved therein; the rotor assembly 32 includes a permanent magnet rotor 71 and a stop rod 72; the nut assembly 34 includes a nut body 41, a stop ring 42 and a stop block 43, the nut body 41 includes a guide slide groove 51, a demoulding plane 52, a lower stop portion 53, a stop block matching mounting portion 54 (and a stop block snap mounting portion 55); the stop ring 42 is provided with a stop portion 61 and a spiral portion 62; the stop block 43 is provided with a nut matching mounting portion 63, an upper stop portion 64 and a stop block welding rib 65 (or a nut snap mounting portion 66). The stop ring 42 is sleeved in the guide rail groove 51 on the nut body 41 and can rotate freely therein, and the stop ring 42 is stopped by the lower stop portion 53. The stop block 43 is assembled with the nut matching mounting portion 63 on the top of the nut body 41 and fixed on the nut body 41, and the upper stop portion 64 is used to stop the stop ring 42.

[0034] Furthermore, in the nut assembly 34 , the stop ring 42 fixes the stop block 43 to the stop block matching mounting portion 54 at the upper end of the nut body 41 by snap-fitting or welding.

[0035] The above-mentioned nut structure has its own guide slide groove 51, which reduces the impact of the deterioration of control accuracy caused by the deformation of the spring guide rail in the existing design, and the split structural design of the stop block can avoid the problem of ring jumping caused by deformation of the stop ring, ensure the reliability of the movement of the stop ring on the guide slide groove, and ensure the reliability of the nut structure.

[0036] It should be noted that, in the actual installation process, a waterproof ring 4 may be mounted on the valve core assembly 2 , and then the coil electronic control assembly 1 may be fixed to the valve body 3 via the connecting pressure plate 14 and connected via the screw assembly 5 .

[0037] In the valve core assembly 2, the rotor assembly 32 and the valve needle component 33 are connected by welding, and the stop rod 72 of the rotor assembly 32 cooperates with the stop portion 61 of the stop ring 42 in the nut assembly 34, thereby controlling the up and down movement of the valve needle component 33. The valve needle component 33 cooperates with the valve seat assembly 35 to form a refrigerant flow portion 21, and the cross-sectional area of ​​the refrigerant flow portion 21 is changed by the up and down movement of the valve needle component 33, thereby accurately controlling the flow of the electronic expansion valve and achieving the precise throttling purpose of the electronic expansion valve.

[0038] Figure 3 The nut assembly 34 is shown, and the cooperation between the nut body 41 and the stop block 43 can be any of the following:

[0039] ① Such as Figure 3 In (a), the nut body 41 is provided with a protruding truncated cone, and the stop block 43 cooperates therewith;

[0040] ② If Figure 3 In (b), the nut body 41 is provided with an inner concave circular hole, and the stop block 43 is provided with a protruding truncated cone to cooperate therewith;

[0041] ③If Figure 3 In (c), the nut body 41 is provided with a fan-shaped mounting groove, and the stop block 43 is provided with a fan-shaped protruding block to cooperate therewith.

[0042] Figure 4 As shown, the nut body 41 in the nut assembly 34 has two oppositely arranged demoulding planes 52 on its outer peripheral surface, and the demoulding planes are parallel to the axis of the nut body. The nut body also has a guide slide groove 51, and the guide slide groove 51 is arranged on the outer peripheral surface of the nut body between the two demoulding planes 52. The maximum distance between the two demoulding planes 52 is L, and the minimum diameter of the spiral guide slide groove 51 is d1, L>(d1-0.3)mm.

[0043] Figure 5 , Figure 6 The stop ring 42 in the electronic expansion valve is shown. The stop ring 42 is provided with a stop portion 61 and a spiral portion 62. The spiral portion 62 can spirally move up and down in the guide rail groove 51 in the nut body 41. The diameter of the stop ring 42 is D, the diameter of the stop ring is d, and the tail end expansion size is a. The tail end of the spiral portion in the stop ring 42 is provided with an expansion protrusion, and the protrusion distance is a. D / 2<(D / 2+a)≤(D / 2+2 / d)The number of turns in the spiral tail end expansion interval is b, and the total number of turns is n, 0 turns<b≤n / 2 turns; 1<n<2. The stop portion 61 of the stop ring 42 cooperates with the stop rod 72 in the rotor assembly 32.

[0044] Figure 7 The figure shows a stopper 43 in an electronic expansion valve. The stopper 43 is provided with a nut matching mounting portion 63 in the form of a straight groove, and the nut body 41 is provided with a stopper matching mounting portion 54 in the form of a straight protrusion matching therewith, so as to ensure that the stopper 43 and the nut body 41 will not rotate relative to each other after assembly; the stopper matching mounting portion 54 of the nut body 41 and the nut matching mounting portion 63 of the stopper 43 can both be provided with buckle mounting portions 55 and 66, and the stopper 43 and the nut body 41 can be connected by buckles ( Figure 5 (a)) or welding ( Figure 5 The stopper 43 is fixed together in the manner (b) to ensure that the stopper 43 will not fall off after assembly. The stopper 43 is also provided with an upper stopper 64 to cooperate with the stopper 61 of the stopper ring 42.

[0045] Figure 8 It is a matching structure of a valve needle component 33, a nut assembly 34, and a stop rod 72 in an electronic expansion valve, wherein the valve needle component 33 cooperates with the nut assembly 34 to perform an up and down rotational movement; the stop ring 42 rotates on the guide slide groove 51 on the nut assembly 34, and the stop ring 42 rotates within the range between the upper stop portion 64 in the stop block 43 and the lower stop portion 53 in the nut body 41; the valve needle component 33 is welded to the rotor assembly 32, and the rotor assembly 32 and the stop rod 72 are welded together. When the rotor assembly 32 rotates under the influence of the magnetic field force, the valve needle component 33 is driven to move together; the stop portion 61 in the stop ring 42 cooperates with the stop rod 72 welded on the rotor assembly 32, thereby indirectly limiting the up and down rotational movement of the rotor assembly 32, so as to realize the control of the entire electronic expansion valve opening range.

[0046] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0047] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. An electronic expansion valve, characterized in that: It includes a coil electronic control assembly, a valve core assembly, a valve body, a waterproof ring and a screw assembly; the valve core assembly is directly connected to the valve body through threads, the coil electronic control assembly is fixed to the valve body through a connecting pressure plate and connected through a screw assembly, and the waterproof ring is arranged between the coil electronic control assembly and the valve core assembly through a groove below the coil electronic control assembly; the coil electronic control assembly includes a coil injection molded part, a circuit board assembly, a cover plate and a connecting pressure plate; the connecting pressure plate and the coil injection molded part are fixed together by welding, the circuit board assembly is electrically connected to the coil injection molded part through a pin, and the cover plate is welded to the coil injection molded part to protect the circuit board assembly in the coil sealing cavity; the valve core assembly includes a metal sleeve, a rotor assembly, a valve needle component, a nut assembly and a valve seat assembly; the nut assembly and the valve needle component are connected together by threads and then welded to the valve seat assembly, the rotor assembly and the valve needle component are fixedly connected by welding, the metal sleeve and the valve seat assembly are welded and the rotor assembly, the valve needle component and the nut assembly are sleeved therein; The rotor assembly includes a permanent magnet rotor and a stop rod; the nut assembly includes a nut body, a stop ring and a stop block, the nut body includes a guide slide groove, a lower stop portion and a stop block mounting portion; the stop ring is provided with a stop portion and a spiral portion; the stop block is provided with a nut matching mounting portion and an upper stop portion; the stop ring is sleeved in the guide slide groove and can rotate freely therein, and the stop ring is stopped by the lower stop portion; the stop block cooperates with the top of the nut body and is fixed on the nut body, and the upper stop portion is used to stop the stop ring.

2. The electronic expansion valve according to claim 1, characterized in that: The stop ring is provided with a stop portion and a spiral portion, and the spiral portion spirally moves up and down in the guide slide groove in the nut body. The diameter of the stop ring is D, the line diameter of the stop ring is d, and the outward expansion size of the tail end is a. An outward expansion protrusion is arranged at the tail end of the spiral portion in the stop ring, and the protruding distance is a, D / 2<(D / 2+a)≤(D / 2+2 / d), the number of turns in the outward expansion interval of the tail end of the spiral portion is b, and the total number of turns is n, 0<b≤n / 2; 1<n<2, and the stop portion cooperates with the stop rod in the rotor assembly.

3. The electronic expansion valve according to claim 1, characterized in that: The outer peripheral surface of the nut body is provided with two oppositely arranged demoulding planes, and the demoulding planes are parallel to the axis of the nut body. The guide slide rail groove is arranged on the outer peripheral surface of the nut body between the two demoulding planes. The maximum distance between the two demoulding planes is L, and the minimum diameter of the guide slide rail groove is d1, L>(d1-0.3)mm.

4. The electronic expansion valve according to claim 1, characterized in that: The cooperation form between the nut body and the stop block is: The nut body is provided with a protruding truncated cone, and the stop block cooperates with the protruding truncated cone; or, The nut body is provided with an inner concave circular hole, and the stop block is provided with a protruding truncated cone to cooperate with the inner concave circular hole; or, The nut body is provided with a fan-shaped installation groove, and the stop block is provided with a fan-shaped protruding block to cooperate with the fan-shaped protruding block.

5. The electronic expansion valve according to claim 4, characterized in that: The stop block is provided with a nut matching installation portion in the form of a straight groove, and the nut body is provided with a stop block matching installation portion in the form of a straight protrusion that matches with the nut body.

6. The electronic expansion valve according to claim 4, characterized in that: A buckle mounting portion is provided on the stop block matching mounting portion of the nut body and the nut matching mounting portion of the stop block, and the stop block and the nut body are fixed together by buckling or welding.

7. The electronic expansion valve according to claim 1, characterized in that: In the nut assembly, the stop ring is sleeved in the guide slide groove of the nut body and stopped by the lower stop part at the bottom of the guide slide groove, and then the stop block is fixed to the stop block mounting part at the upper end of the nut body by welding, and the stop block is provided with an upper stop part and a stop ring.

8. The electronic expansion valve according to claim 1, characterized in that: In the valve core assembly, the rotor assembly and the valve needle component are connected by welding, and the stop rod of the rotor assembly cooperates with the stop part of the stop ring in the nut assembly to control the up and down movement of the valve needle component; the valve needle component cooperates with the valve seat assembly to form a refrigerant circulation part, and the cross-sectional area of ​​the refrigerant circulation part is changed by the up and down movement of the valve needle component.

Images