Electronic expansion valve

Abstract

The application relates to the technical field of valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a supporting nut assembly, a guide vane and a stop ring, the supporting nut assembly is provided with a spiral guide groove, and the supporting nut assembly is provided with a first stop position and a second stop position. The stop ring comprises a spiral body, a first matching part and a second matching part, and the spiral body is slidably installed in the spiral guide groove. A plane perpendicular to the axial direction of the stop ring is defined as a projection plane, the projections of the first matching part and the second matching part on the projection plane are misaligned, in the opening process, the guide vane is in contact with the second matching part and can push the first matching part to stop cooperating with the first stop position, and in the closing process, the guide vane is in contact with the first matching part and can push the second matching part to stop cooperating with the second stop position. The electronic expansion valve provided by the application solves the problem that the existing stop ring produces a large impact noise when impacting the first stop position or the second stop position.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an electronic expansion valve. Background Technology

[0002] Currently, electronic expansion valves include a nut seat, a screw, a valve core, and a rotor assembly. One end of the screw passes through the nut seat and is threaded into it, while the other end connects to the rotor assembly. The valve core is connected to the screw, allowing the rotor assembly to rotate and drive the screw and valve core to move axially. To control the stroke of the screw and valve core, electronic expansion valves often use a stop ring and a guide plate for stopping. The stop ring is fitted onto the helical guide groove of the nut seat, and the guide plate is installed on the rotor assembly and rotates synchronously with the rotor assembly. During rotation, the guide plate contacts the stop ring and drives it to move along the helical guide groove until the stop ring contacts the stop position at the end of the helical guide groove, thus limiting the valve's on / off position.

[0003] In related technologies, the stop ring includes a spiral body, a first mating part connected to the upper end of the spiral body, and a second mating part connected to the lower end of the spiral body. The spiral body is adapted to a spiral guide groove. The first and second mating parts are used to cooperate with a guide plate to drive the stop ring. Currently, the guide plate directly drives the first mating part, causing the first mating part to directly impact the first stop position above the spiral guide groove, thus achieving a stop engagement between the first mating part and the first stop position. Alternatively, the guide plate directly drives the second mating part, causing the second mating part to directly impact the second stop position below the spiral guide groove, thus achieving a stop engagement between the second mating part and the second stop position. This results in significant impact noise. Utility Model Content

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem that existing stop rings generate large impact noise when they strike the first or second stop position.

[0005] This application provides an electronic expansion valve, which includes a support nut assembly, a guide plate, and a stop ring. The support nut assembly is provided with a helical guide rail, and has a first stop position and a second stop position. The first stop position is located near the top of the support nut assembly, and the second stop position is located near the bottom of the support nut assembly. The stop ring includes a helical body, a first mating portion protruding from one end of the helical body, and a second mating portion protruding from the other end of the helical body. The helical body is slidably mounted in the helical guide rail. The guide plate rotates around the support nut assembly circumferentially, so that the guide plate can engage with the first mating portion. Alternatively, the second mating part can drive the stop ring to rotate; wherein, a plane perpendicular to the axial direction of the stop ring is defined as a projection plane, and the projections of the first mating part and the second mating part on the projection plane are misaligned; during valve opening, the stop ring moves from the bottom to the top of the support nut assembly, and the guide plate contacts the second mating part and can push the first mating part to engage with the first stop position; during valve closing, the stop ring moves from the top to the bottom of the support nut assembly, and the guide plate contacts the first mating part and can push the second mating part to engage with the second stop position.

[0006] In one embodiment, the angle formed by the projections of the first mating part and the second mating part on the projection surface is M, where 5°≤M≤30°.

[0007] In one embodiment, the electronic expansion valve has a fully open state and a fully closed state. In the fully open state, the guide plate does not contact the first mating part, and the guide plate contacts the second mating part; in the fully closed state, the guide plate does not contact the second mating part, and the guide plate contacts the first mating part.

[0008] In one embodiment, when the second mating part engages with the second stop position, the bottom end of the guide plate and the second mating part are spaced apart along the axial direction of the electronic expansion valve; the electronic expansion valve has a first state and a second state during the valve opening process; in the first state, the guide plate contacts the first mating part; in the second state, the guide plate contacts the second mating part until the first mating part engages with the first stop position.

[0009] In one embodiment, the guide plate includes a first sidewall, a second sidewall, and a third sidewall; the first sidewall and the second sidewall are disposed opposite to each other; the third sidewall is located at the end of the guide plate away from the top of the support nut assembly, one end of the third sidewall is connected to the first sidewall, and the other end extends downward toward the second sidewall; the electronic expansion valve has a first state and a fourth state during the valve opening process; in the first state, the first sidewall contacts the first mating part, and in the fourth state, the third sidewall contacts the second mating part.

[0010] In one embodiment, the electronic expansion valve also has a second state during the valve opening process, in which the first sidewall contacts the second mating part.

[0011] In one embodiment, the angle formed by the plane containing the third sidewall and the first sidewall is N, where 15°≤N≤45°.

[0012] In one embodiment, the electronic expansion valve has a third state during the valve closing process, in which the second sidewall contacts the first mating part.

[0013] In one embodiment, the guide plate is provided with a fourth sidewall at one end away from the top of the support nut assembly, and the fourth sidewall is connected to the second sidewall and the third sidewall respectively; wherein, when the second mating part is engaged with the second stop, the fourth sidewall and the second mating part are spaced apart along the axial direction of the electronic expansion valve.

[0014] In one embodiment, the fourth sidewall extends radially along the support nut assembly, with an extension dimension of L, 0.5mm≤L≤1mm.

[0015] In one embodiment, during the valve opening process, when the stop ring moves to its highest point, the point where the second mating part contacts the guide plate is the abutment point. The straight line formed by connecting the abutment point and any point on the surface of the first mating part is the first straight line. The minimum included angle between the first straight line and the axis of the support nut assembly is A. The end of the first sidewall near the top of the support nut assembly is defined as the abutment section. The included angle between the abutment section and the axis of the support nut assembly is B, where A > B.

[0016] In one embodiment, the pitch of the spiral body is P, and 1.35mm≤P≤1.45mm.

[0017] In one embodiment, the support nut assembly includes a support nut, the outer wall of which has the spiral guide rail, the first stop, and the second stop, and the spiral guide rail, the first stop, and the second stop are integrally formed; or, the support nut assembly includes a support nut and a spring guide rail sleeved on the outer wall of the support nut, the spring guide rail forming the spiral guide rail, the top of the spring guide rail having the first stop and the bottom of the support nut having the second stop.

[0018] In one embodiment, the electronic expansion valve further includes a screw and a rotor assembly. The rotor assembly is disposed on top of the support nut assembly. One end of the screw is connected to the rotor assembly, and at least a portion of the screw is located within the support nut assembly. The guide plate is connected to the rotor assembly and / or the screw. The electronic expansion valve further includes a valve body assembly and a valve core assembly. The valve body assembly has a valve port. The valve core assembly is disposed within the valve body assembly and connected to the end of the screw away from the rotor assembly. The valve core assembly is movable towards or away from the valve port under the drive of the screw. The support nut assembly is fixedly mounted on the valve body assembly. The valve body assembly includes a first valve body and a second valve body. The first valve body has a mounting hole, and the inner wall of the mounting hole has a first step. The support nut assembly is partially inserted into the mounting hole, and the outer wall of the support nut assembly has a second step. The first step and the second step abut against each other along the axial direction of the support nut assembly. The second valve body is disposed at the bottom of the support nut assembly. The second valve body is partially inserted into the mounting hole and abuts against the support nut assembly to cooperate with the first step in limiting the support nut assembly; the second valve body is at least partially inserted into the support nut assembly, and the second valve body forms a guide hole, in which the valve core assembly is installed; the valve core assembly includes a valve needle, a spring sleeve, a friction-reducing component, a spring seat, and an elastic element; the outer wall of the spring sleeve slides against the inner wall of the guide hole; one end of the spring sleeve has a limiting portion; the friction-reducing component is movably installed within the spring sleeve, and... The screw is capable of abutting against the limiting part along the axial direction. One end of the screw passes through the limiting part and is connected to the anti-friction member. The valve needle is connected to the end of the spring sleeve away from the limiting part. The spring seat and the elastic member are disposed between the anti-friction member and the valve needle, and both ends of the elastic member abut against the spring seat and the valve needle respectively, so that the spring seat can abut against the anti-friction member, and a preset gap can be formed between the spring seat and the valve needle. The valve port is opened in the second valve body and communicates with the guide hole.

[0019] Compared with the prior art, the electronic expansion valve provided in this application sets the projections of the first mating part and the second mating part on the projection plane in a staggered manner, and controls the guide plate to drive the stop ring mainly by contacting the second mating part during the valve opening process. In this way, the entire valve opening action is completed when the first mating part of the stop ring engages with the first stop position. Furthermore, the force applied by the guide plate to the second mating part is transmitted sequentially through the spiral body and the first mating part to the first stop position. The entire force transmission path is relatively long, and the spiral body can store some impact energy, effectively prolonging the impact time and reducing the peak force. This avoids a large impact when the first mating part engages with the first stop position, achieving a buffering effect and reducing the probability of the first stop position being damaged due to excessive impact force. At the same time, it also solves the problem of large noise caused by large impact force. Similarly, during the valve closing process, the guide plate mainly relies on contact with the first mating part to drive the stop ring, and completes the entire valve closing action when the second mating part of the stop ring stops at the second stop position. In this way, the force generated when the valve is stopped has a long transmission path and can be buffered by the spiral body, thereby reducing the probability of damage to the second stop position and further reducing the generation of noise. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment provided in this application;

[0022] Figure 2 A schematic diagram of an electronic expansion valve in the closed state according to an embodiment of this application;

[0023] Figure 3 A schematic diagram of an electronic expansion valve in the fully open state according to an embodiment of this application;

[0024] Figure 4 A schematic diagram of the opening process of an electronic expansion valve according to an embodiment of this application;

[0025] Figure 5 A top view of a stop ring according to an embodiment provided in this application;

[0026] Figure 6 A front view of a stop ring according to an embodiment provided in this application;

[0027] Figure 7A front view of a guide plate according to an embodiment provided in this application.

[0028] The symbols in the diagram represent the following meanings:

[0029] 100. Electronic expansion valve; 10. Support nut assembly; 101. Helical guide rail; 102. First stop; 103. Second stop; 11. Support nut; 111. Second step; 20. Screw; 30. Rotor assembly; 40. Guide plate; 41. First sidewall; 411. Abutment section; 412. Connecting section; 42. Second sidewall; 43. Third sidewall; 44. Fourth sidewall; 50. Stop ring; 51. Spiral body; 52. First mating part; 53. Second mating part; 60. Valve body assembly; 601. Valve port; 602. Guide hole; 61. First valve body; 6101. Mounting hole; 611. First step; 62. Second valve body; 70. Valve core assembly; 701. Preset gap; 71. Valve needle; 72. Spring sleeve; 721. Limiting part; 73. Anti-friction component; 74. Spring seat; 75. Elastic component. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figures 1-7 To address the problem of significant impact noise generated by existing stop rings when impacting the first or second stop position, this application provides an electronic expansion valve 100. The electronic expansion valve 100 includes a valve body assembly 60, a valve core assembly 70, a support nut assembly 10, a screw 20, and a rotor assembly 30. The valve body assembly 60 has a valve port 601. The support nut assembly 10 is fixedly installed on the valve body assembly 60. The rotor assembly 30 is located on top of the support nut assembly 10. One end of the screw 20 is connected to the rotor assembly, and at least a portion of the screw 20 is located within the support nut assembly 10. The valve core assembly 70 is located within the valve body assembly 60 and connected to the end of the screw 20 away from the rotor assembly 30. The valve core assembly 70 can move towards or away from the valve port 601 under the drive of the screw 20, thereby achieving flow control at the valve port 601.

[0036] Specifically, the support nut assembly 10 in this embodiment includes a support nut 11, and the screw 20 is threadedly engaged with the support nut 11. This allows the rotor assembly 30 to drive the screw 20 to rotate synchronously when rotating, and the screw 20, through its threaded engagement with the support nut 11, converts rotation into axial movement, thereby enabling the valve core assembly 70 to regulate the flow rate at the valve port 601. Alternatively, the threaded structure on the support nut assembly 10 can be omitted, and a separate component can be threadedly engaged with the screw 20, as long as the same function is achieved. The support nut assembly 10 has a first stop 102 and a second stop 103. The first stop 102 is located near the top of the support nut assembly 10, and the second stop 103 is located near the bottom of the support nut assembly 10. It is easy to understand that the first stop 102 controls the upper limit of the screw 20's movement, and the second stop 103 controls the lower limit of the screw 20's movement. It should be noted that in this application, "above" or "top" refers to the direction away from the valve port 601, and "below" or "bottom" refers to the direction close to the valve port 601.

[0037] The outer wall of the support nut 11 has a spiral guide rail 101, a first stop 102, and a second stop 103. The spiral guide rail 101, the first stop 102, and the second stop 103 are integrally formed; that is, the spiral guide rail 101 is a groove structure formed by the recess in the outer wall of the support nut 11. Alternatively, in other embodiments, the support nut assembly 10 further includes a spring guide rail sleeved on the outer wall of the support nut 11. The spring guide rail forms the spiral guide rail 101, with the first stop 102 at the top and the second stop 103 at the bottom; that is, the spiral guide rail 101 is a separate slide rail component. This application uses a groove-shaped spiral guide rail 101 as an example for explanation.

[0038] Furthermore, the electronic expansion valve 100 also includes a guide plate 40 and a stop ring 50. The stop ring 50 includes a spiral body 51, a first mating part 52 protruding from one end of the spiral body 51, and a second mating part 53 protruding from the other end of the spiral body 51. The spiral body 51 is slidably mounted in the spiral guide rail 101. The guide plate 40 rotates around the support nut assembly 10 circumferentially, so that the guide plate 40 can drive the first mating part 52 or the second mating part 53 to rotate the stop ring 50. A plane perpendicular to the axial direction of the stop ring 50 is defined as the projection plane. The projections of the first mating part 52 and the second mating part 53 on the projection plane are misaligned. During valve opening, if... Figure 3 As shown, the stop ring 50 moves from the bottom to the top of the support nut assembly 10, and the guide plate 40 contacts the second mating part 53 and can push the first mating part 52 to engage with the first stop position 102. During the valve closing process, as... Figure 2 As shown, the stop ring 50 moves from the top of the support nut assembly 10 to the bottom of the support nut assembly 10, and the guide plate 40 contacts the first mating part 52 and can push the second mating part 53 to stop and engage with the second stop position 103.

[0039] Understandably, this application achieves this by misaligning the projections of the first mating part 52 and the second mating part 53 on the projection surface, and by controlling the guide plate 40 to drive the stop ring 50 primarily through contact with the second mating part 53 during the valve opening process. Thus, the entire valve opening action is completed when the first mating part 52 of the stop ring 50 engages with the first stop position 102. Furthermore, the force applied by the guide plate 40 to the second mating part 53 is sequentially transmitted through the spiral body 51 and the first mating part 52 to the first stop position 102. The entire force transmission path is relatively long, and the spiral body 51 can store some impact energy, effectively extending the impact time and reducing the peak force. This avoids a large impact when the first mating part 52 engages with the first stop position 102, achieving a buffering effect and reducing the probability of damage to the first stop position 102 due to excessive impact force. It also solves the problem of excessive noise caused by large impact force. Similarly, during the valve closing process, the guide plate 40 mainly relies on contact with the first mating part 52 to drive the stop ring 50, and completes the entire valve closing action when the second mating part 53 of the stop ring 50 stops with the second stop position 103. In this way, the force generated when the valve is stopped has a longer transmission path and can be buffered by the spiral body 51, thereby reducing the probability of damage to the second stop position 103 and further reducing the generation of noise.

[0040] In one embodiment, the electronic expansion valve 100 has a fully open state and a fully closed state. In the fully open state, the guide plate 40 is not in contact with the first mating part 52, but is in contact with the second mating part 53. In the fully closed state, the guide plate 40 is not in contact with the second mating part 53, but is in contact with the first mating part 52. Here, the fully open state refers to the extreme position where the guide plate 40 moves upward during the valve opening process of the electronic expansion valve 100, at which time the first mating part 52 and the first stop position 102 form a stop engagement. The fully closed state refers to the extreme position where the guide plate 40 moves downward during the valve closing process of the electronic expansion valve 100, at which time the second mating part 53 and the second stop position 103 form a stop engagement. That is, during the valve opening process, the guide plate 40 contacts the second mating part 53 and pushes the first mating part 52 to engage with the first stop position 102, ensuring that the second mating part 53 and the first stop position 102 do not directly contact each other. At the same time, during the valve closing process, the guide plate 40 contacts the first mating part 52 and pushes the second mating part 53 to engage with the second stop position 103, ensuring that the first mating part 52 and the second stop position 103 do not directly contact each other. In this way, it is ensured that the spiral body 51 can provide buffering in both the fully open and fully closed states, avoiding the problem of excessive noise caused by direct impact.

[0041] Specifically, the guide plate 40 provided in this application can be connected to the rotor assembly 30 or the screw 20, or it can be connected to both the rotor assembly 30 and the screw 20 at the same time to improve the connection reliability.

[0042] In one embodiment, the spiral body 51, the first mating part 52, and the second mating part 53 are integrally formed to facilitate processing and improve the overall structural strength and stability of the stop ring 50. The first mating part 52 and the second mating part 53 can be formed by bending the two ends of the spiral body 51 outwards. Of course, in other embodiments, the first mating part 52 and the second mating part 53 can also be welded to the spiral body 51; the specific configuration can be determined according to actual needs.

[0043] In one embodiment, the pitch of the helical body 51 is P, and 1.35mm ≤ P ≤ 1.45mm. Typically, the pitch of the helical guide rail 101 is matched with the pitch of the helical body 51. By controlling the pitch P of the helical body 51 within the range of 1.35mm to 1.45mm, the linear distance the helical body 51 moves axially in one revolution within the helical guide rail 101 is greater than the linear distance the threaded engagement at the screw 20 moves axially in one revolution. That is, the overall axial travel of the screw 20 is less than the travel of the stop ring 50, thereby reducing the size of the valve body assembly 60 and lowering costs. It is easy to understand that when P > 1.45mm, the linear distance the stop ring 50 moves in one revolution is large. This may result in the valve core assembly 70 being restricted in its movement by the stop ring 50 before it can fully open or close the valve port 601, thus affecting the normal operation of the electronic expansion valve 100. When P < 1.35 mm, the linear distance that the stop ring 50 moves in one revolution is small. The rotor assembly 30 and the screw 20 need a large displacement space to achieve the smooth stopping of the stop ring 50, which will lead to an increase in the overall structure. Alternatively, if the stop ring is not successfully stopped at the predetermined position, the valve core assembly 70 will continue to be driven by the rotor assembly 30 and interfere with the valve body assembly 60, resulting in structural damage due to excessive force.

[0044] For example, the pitch P of the spiral body 51 can be set to 1.35mm, 1.4mm or 1.45mm, etc.

[0045] To facilitate the engagement between the stop ring 50 and the guide plate 40, in one embodiment, the first mating portion 52 and / or the second mating portion 53 extend radially along the stop ring 50. This effectively reduces design complexity.

[0046] In one embodiment, when the second mating part 53 engages with the second stop 103, the bottom end of the guide plate 40 and the second mating part 53 are spaced apart along the axial direction of the electronic expansion valve 100. The electronic expansion valve 100 exists in a first state and a second state during the valve opening process. In the first state, the guide plate 40 contacts the first mating part 52; in the second state, the guide plate 40 contacts the second mating part 53 until the first mating part 52 engages with the first stop 102. Specifically, during the valve opening process, the guide plate 40 first contacts the first mating part 52, and after the stop ring 50 moves upward a certain distance, the guide plate 40 contacts the second mating part 53. The bottom end of the guide plate 40 does not need to be in contact with the second mating part 53, which reduces the overall axial length of the guide plate 40 and lowers the probability of interference with the support nut assembly 10. Simultaneously, it also enables the switching of the driving mating parts, allowing for buffering using the spiral body 51. Specifically, the guide plate 40 includes a first sidewall 41 and a second sidewall 42, with the first sidewall 41 and the second sidewall 42 arranged opposite to each other. During the opening process of the electronic expansion valve 100, the first sidewall 41 can drive the stop ring 50 to slide along the spiral guide rail 101, while during the closing process of the electronic expansion valve 100, the second sidewall 42 can drive the stop ring 50 to slide along the spiral guide rail 101.

[0047] During the valve closing process of the electronic expansion valve 100 provided in this application, the guide plate 40 drives the stop ring 50 to slide along the spiral guide rail 101 through contact with the first mating part 52 until the second mating part 53 contacts the second stop position 103 to achieve a limit. During this period, since the linear distance that the guide plate 40 descends in one revolution is less than the linear distance that the stop ring 50 descends in one revolution, the first mating part 52 has a gradually downward movement trend on the second side wall 42.

[0048] During the opening process of the electronic expansion valve 100 provided in this application, the first sidewall 41 first contacts the first mating part 52, while the end of the guide plate 40 away from the rotor assembly 30 and the second mating part 53 are spaced apart axially in the support nut assembly 10. Subsequently, as the guide plate 40 continues to rotate, the guide plate 40, through contact with the first mating part 52, causes the stop ring 50 to begin sliding along the spiral guide rail 101. Since the linear distance the guide plate 40 rises in one rotation is less than the linear distance the stop ring 50 rises in one rotation, the second mating part 53 gradually approaches the end of the guide plate 40. If the second mating part 53 contacts the end of the guide plate 40, there is a risk of jamming.

[0049] If the bottom end face of the guide plate 40 is too long along the radial direction of the electronic expansion valve 100, during the valve opening process, the second mating part 53 may move to abut against the bottom end face of the guide plate 40, causing the stop ring 50 to jam. Therefore, to avoid the stop ring 50 jamming during the valve opening process when the first mating part 52 and the second mating part 53 are misaligned, in one embodiment, such as... Figure 4 As shown, the guide plate 40 also includes a third sidewall 43, which is located at the end of the guide plate 40 away from the top of the support nut assembly 10. One end of the third sidewall 43 is connected to the first sidewall 41, and the other end extends downward toward the second sidewall 42. The third sidewall 43 can push the second mating part 53. In the first state, the first sidewall 41 contacts the first mating part 52. In the second state, the first sidewall 41 contacts the second mating part 53. The electronic expansion valve 100 also has a fourth state during the valve opening process. In the fourth state, the third sidewall 43 contacts the second mating part 53. It is easy to understand that the fourth state is a transitional state between the first and second states during the valve opening process. During this period, the contact between the first sidewall 41 and the second mating part 53 is achieved through the transition of the third sidewall 43.

[0050] Specifically, in this embodiment, the third sidewall 43 has a chamfered structure. In this way, during the valve opening process, the first sidewall 41 contacts the first mating part 52 first, and then the second mating part 53 can be guided by the third sidewall 43. Since the straight-line distance of the guide plate 40 rotating one revolution is less than the straight-line distance of the stop ring 50 rotating one revolution, the second mating part 53 gradually approaches the third sidewall 43 during the upward movement of the stop ring 50. After the second mating part 53 contacts the third sidewall 43, the second mating part 53 can gradually move along the third sidewall 43 to contact the first sidewall 41. During this period, the first mating part 52 gradually moves away from the first sidewall 41. This not only effectively avoids the problem of the stop ring 50 getting stuck during valve opening, but also ensures that during subsequent upward movement, the contact position between the stop ring 50 and the guide plate 40 can be transformed into the second mating part 53. This allows the spiral body 51 to buffer the contact between the first mating part 52 and the first stop position 102, reducing the probability of damage to the first stop position 102 and preventing noise generation. Furthermore, the bottom end of the third sidewall 43 represents the shortest distance between the guide plate 40 and the valve port 601 along the axial direction of the electronic expansion valve 100. The bottom end of the third sidewall 43 and the second mating part 53 are spaced apart along the axial direction of the electronic expansion valve 100. The third sidewall 43 not only reduces the overall axial length of the guide plate 40 but also prevents the stop ring 50 from getting stuck during valve opening.

[0051] Specifically, such as Figure 7As shown, the angle formed by the plane containing the third sidewall 43 and the first sidewall 41 is N, where 15°≤N≤45°. This facilitates the sliding of the second mating part 53 along the third sidewall 43 during valve opening, reducing the difficulty of sliding.

[0052] Optionally, the value of N can be 15°, 20°, 25°, 30°, 35°, 40°, or 45°, etc.

[0053] Furthermore, the electronic expansion valve 100 has a third state during the valve closing process. In the third state, the second sidewall 42 contacts the first mating part 52 so as to drive the stop ring 50 to rotate.

[0054] Specifically, in one embodiment, such as Figure 7 As shown, the end of the guide plate 40 away from the top of the support nut assembly 10 is provided with a fourth sidewall 44, which is connected to the second sidewall 42 and the third sidewall 43 respectively. This ensures the structural strength of the end of the guide plate 40 away from the top of the support nut assembly 10 and reduces the probability of deformation of the guide plate 40. When the second mating part 53 engages with the second stop position 103, the fourth sidewall 44 and the second mating part 53 are spaced apart along the axial direction of the electronic expansion valve 100 to avoid interference between the structure of the guide plate 40 and the support nut assembly 10, thus improving safety.

[0055] The fourth sidewall 44 extends radially along the support nut assembly 10, with an extension dimension of L, where 0.5mm ≤ L ≤ 1mm. This facilitates the machining of the guide plate 40 and ensures the structural strength of the guide plate 40. Optionally, the value of L can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, etc.

[0056] In one embodiment, such as Figure 5 As shown, the angle formed by the projections of the first mating part 52 and the second mating part 53 on the projection plane is M, where 5° ≤ M ≤ 30°. This further facilitates the mating of the stop ring 50 and the guide plate 40, reducing the risk of jamming caused by interference between the stop ring 50 and the guide plate 40. It is easy to understand that if M > 30°, the distance between the projections of the first mating part 52 and the second mating part 53 is relatively large. During the valve opening process, the second mating part 53 is prone to moving and abutting against the bottom surface of the guide plate 40 along the valve axial direction, causing the stop ring 50 to jam. Specifically, when the first mating part 52 contacts the guide plate 40, the second mating part 53 does not contact the third side wall 43, but abuts against the fourth side wall 44, which easily leads to the stop ring 50 jamming. If M < 5°, the distance between the projections of the first mating part 52 and the second mating part 53 is relatively close. During the valve opening process, when the stop ring 50 moves to the highest point, there is a risk that the guide plate 40 will come into contact with the first mating part 52, which will result in the inability to achieve buffering through the spiral body 51.

[0057] Optionally, the value of M can be 5°, 10°, 15°, 20°, 25°, or 30°, etc.

[0058] It should be noted that M here is the angle formed by the intersection of the projection of the axis of the first mating part 52 on the projection plane and the projection of the axis of the second mating part 53 on the projection plane.

[0059] Furthermore, in one embodiment, as Figure 6 and Figure 7 As shown, during the valve opening process, when the stop ring 50 moves to its highest point, the point where the second mating part 53 contacts the guide plate 40 is the contact point. The straight line formed by connecting the contact point and any point on the surface of the first mating part 52 is the first straight line. The minimum angle between the first straight line and the axis of the support nut assembly 10 is A. The end of the first sidewall 41 near the top of the support nut assembly 10 is defined as the contact section 411, and the angle between the contact section 411 and the axis of the support nut assembly 10 is B, where A > B. In this way, it can be ensured that in the fully open state, the guide plate 40 will not contact the first mating part 52, so that the stop ring 50 can rely on the spiral body 51 to provide a buffering effect. It should be noted that the first sidewall 41 also includes a connecting section 412. The two ends of the connecting section 412 are connected to the abutting section 411 and the third sidewall 43. The connecting section 412 can be set parallel to the axis of the support nut assembly 10 and at a certain angle to the abutting section 411. Thus, the plane where the connecting section 412 is located and the third sidewall 43 form an angle N.

[0060] In one embodiment, such as Figure 1 As shown, the valve body assembly 60 includes a first valve body 61 and a second valve body 62. The first valve body 61 has a mounting hole 6101, and the inner wall of the mounting hole 6101 has a first step 611. A support nut assembly 10 is partially inserted into the mounting hole 6101, and the outer wall of the support nut assembly 10 has a second step 111. The first step 611 and the second step 111 abut against each other along the axial direction of the support nut assembly 10. The second valve body 62 is located at the bottom of the support nut assembly 10, and a portion of the second valve body 62 is inserted into the mounting hole 6101 and abuts against the support nut assembly 10 to cooperate with the first step 611 to limit the axial movement of the support nut assembly 10. In this way, the second valve body 62 and the first step 611 can limit the axial movement of the support nut assembly 10, ensuring reliable installation of the support nut assembly 10.

[0061] Furthermore, the second valve body 62 is at least partially inserted into the support nut assembly 10, and the second valve body 62 forms a guide hole 602, within which the valve core assembly 70 is installed. The valve core assembly 70 includes a valve needle 71, a spring sleeve 72, a friction-reducing element 73, a spring seat 74, and an elastic element 75. The friction-reducing element 73 can be a bearing or bushing, etc., to reduce friction with the spring sleeve 72. The outer wall of the spring sleeve 72 slides against the inner wall of the guide hole 602. One end of the spring sleeve 72 is provided with a limiting part 721. The friction-reducing element 73 is movably installed within the spring sleeve 72 and can abut against the limiting part 721 axially. One end of the screw 20 passes through the limiting part 721 and is connected to the friction-reducing element 73. The valve needle 71 is connected to the end of the spring sleeve 72 away from the limiting part 721. The spring seat 74 and the elastic member 75 are disposed between the anti-friction member 73 and the valve needle 71, and the two ends of the elastic member 75 respectively abut against the spring seat 74 and the valve needle 71, so that the spring seat 74 can abut against the anti-friction member 73, and a preset gap 701 can be formed between the spring seat 74 and the valve needle 71. The valve port 601 is opened in the second valve body 62 and communicates with the guide hole 602.

[0062] Understandably, with this configuration, during the closing process of the electronic expansion valve 100, when the valve needle 71 just abuts against the valve port 601, a preset gap still exists between the spring seat 74 and the valve needle 71 under the elastic force of the elastic element 75. Subsequently, the rotor assembly 30 continues to drive the screw 20 to rotate, causing the screw 20 to move downwards to overcome the elastic force of the elastic element 75 and eliminate the preset gap, ensuring a reliable seal between the valve needle 71 and the valve port 601. Later, during the opening process of the electronic expansion valve 100, the rotor assembly 30 drives the screw 20 to rise. Due to the presence of the elastic element 75, before a preset gap of the size is formed between the spring seat 74 and the valve needle 71, the valve needle 71 can maintain its engagement with the valve port 601. Then, as the rotor assembly 30 continues to rotate, the screw 20, through the engagement of the anti-friction element 73 and the limiting part 721, drives the entire valve core assembly 70 to move, thus opening the valve. Thus, the electronic expansion valve 100 does not require a constant pulse process during assembly, which facilitates installation and adjustment and helps improve the flow consistency of the electronic expansion valve 100.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, The assembly includes a support nut assembly (10), a guide plate (40), and a stop ring (50). The support nut assembly (10) is provided with a spiral guide rail (101). The support nut assembly (10) is provided with a first stop position (102) and a second stop position (103). The first stop position (102) is located near the top of the support nut assembly (10), and the second stop position (103) is located near the bottom of the support nut assembly (10). The stop ring (50) includes a spiral body (51), a first mating part (52) protruding from one end of the spiral body (51) and a second mating part (53) protruding from the other end of the spiral body (51). The spiral body (51) is slidably installed in the spiral guide rail (101). The guide plate (40) rotates around the support nut assembly (10) in the circumferential direction so that the guide plate (40) can drive the first mating part (52) or the second mating part (53) to drive the stop ring (50) to rotate. Wherein, a plane perpendicular to the axial direction of the stop ring (50) is defined as the projection plane, and the first mating part (52) and the second mating part (53) are projected and misaligned on the projection plane; during the valve opening process, the stop ring (50) moves from the bottom of the support nut assembly (10) to the top of the support nut assembly (10), and the guide plate (40) contacts the second mating part (53) and can push the first mating part (52) to stop and engage with the first stop position (102); during the valve closing process, the stop ring (50) moves from the top of the support nut assembly (10) to the bottom of the support nut assembly (10), and the guide plate (40) contacts the first mating part (52) and can push the second mating part (53) to stop and engage with the second stop position (103).

2. The electronic expansion valve according to claim 1, characterized in that, The angle formed by the projections of the first mating part (52) and the second mating part (53) on the projection surface is M, where 5°≤M≤30°.

3. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve has a fully open state and a fully closed state. In the fully open state, the guide plate (40) does not contact the first mating part (52), and the guide plate (40) contacts the second mating part (53). In the fully closed state, the guide plate (40) does not contact the second mating part (53), and the guide plate (40) contacts the first mating part (52).

4. The electronic expansion valve according to any one of claims 1-3, characterized in that, When the second mating part (53) is mated with the second stop (103), the bottom end of the guide plate (40) and the second mating part (53) are spaced apart along the axial direction of the electronic expansion valve. The electronic expansion valve has a first state and a second state during the valve opening process; in the first state, the guide plate (40) contacts the first mating part (52); in the second state, the guide plate (40) contacts the second mating part (53) until the first mating part (52) stops and engages with the first stop position (102).

5. The electronic expansion valve according to any one of claims 1-3, characterized in that, The guide plate (40) includes a first sidewall (41), a second sidewall (42), and a third sidewall (43); the first sidewall (41) and the second sidewall (42) are disposed opposite to each other; the third sidewall (43) is located at one end of the guide plate (40) away from the top of the support nut assembly (10), one end of the third sidewall (43) is connected to the first sidewall (41), and the other end extends downward toward the second sidewall (42); The electronic expansion valve has a first state and a fourth state during the valve opening process; in the first state, the first sidewall (41) contacts the first mating part (52), and in the fourth state, the third sidewall (43) contacts the second mating part (53).

6. The electronic expansion valve according to claim 5, characterized in that, The electronic expansion valve also exists in a second state during the valve opening process. In the second state, the first sidewall (41) contacts the second mating part (53).

7. The electronic expansion valve according to claim 5, characterized in that, The angle formed by the plane containing the third sidewall (43) and the first sidewall (41) is N, where 15°≤N≤45°.

8. The electronic expansion valve according to claim 5, characterized in that, The electronic expansion valve has a third state during the valve closing process, in which the second sidewall (42) contacts the first mating part (52).

9. The electronic expansion valve according to claim 5, characterized in that, The guide plate (40) is provided with a fourth sidewall (44) at one end away from the top of the support nut assembly (10), and the fourth sidewall (44) is connected to the second sidewall (42) and the third sidewall (43) respectively; When the second mating part (53) is mated with the second stop (103), the fourth side wall (44) and the second mating part (53) are spaced apart along the axial direction of the electronic expansion valve.

10. The electronic expansion valve according to claim 9, characterized in that, The fourth sidewall (44) extends radially along the support nut assembly (10) with an extension dimension of L, 0.5mm≤L≤1mm.

11. The electronic expansion valve according to claim 5, characterized in that, During the valve opening process, when the stop ring (50) moves to the highest point, the point where the second mating part (53) contacts the guide plate (40) is the contact point. The straight line formed by connecting the contact point with any point on the surface of the first mating part (52) is the first straight line. The minimum included angle formed between the first straight line and the axis of the support nut assembly (10) is A. The end of the first sidewall (41) near the top of the support nut assembly (10) is defined as the abutment section (411), and the angle formed between the abutment section (411) and the axis of the support nut assembly (10) is B, where A > B.

12. The electronic expansion valve according to claim 1, characterized in that, The pitch of the spiral body (51) is P, and 1.35mm≤P≤1.45mm.

13. The electronic expansion valve according to claim 1, characterized in that, The support nut assembly (10) includes a support nut (11), the outer wall of which has the spiral guide rail (101), the first stop (102) and the second stop (103), and the spiral guide rail (101), the first stop (102) and the second stop (103) are integrally formed structures; Alternatively, the support nut assembly (10) includes a support nut (11) and a spring guide rail sleeved on the outer wall of the support nut (11). The spring guide rail forms the spiral guide rail (101), and the top of the spring guide rail is provided with the first stop position (102), and the bottom of the spring guide rail is provided with the second stop position (103).

14. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a screw (20) and a rotor assembly (30), the rotor assembly (30) being disposed on top of the support nut assembly (10), one end of the screw (20) being connected to the rotor assembly (30), and at least a portion of the screw (20) being located within the support nut assembly (10); wherein, the guide plate (40) is connected to the rotor assembly (30) and / or the screw (20). The electronic expansion valve further includes a valve body assembly (60) and a valve core assembly (70). The valve body assembly (60) has a valve port (601). The valve core assembly (70) is located inside the valve body assembly (60) and is connected to the end of the screw (20) away from the rotor assembly (30). The valve core assembly (70) can move towards or away from the valve port (601) under the drive of the screw (20). The support nut assembly (10) is fixedly installed on the valve body assembly (60). The valve body assembly (60) includes a first valve body (61) and a second valve body (62). The first valve body (61) has a mounting hole (6101), and the inner wall of the mounting hole (6101) has a first step (611). The support nut assembly (10) is partially inserted into the mounting hole (6101), and the outer wall of the support nut assembly (10) has a second step (111). The first step (611) and the second step (111) abut against each other along the axial direction of the support nut assembly (10). The second valve body (62) is disposed at the bottom of the support nut assembly (10), and the second valve body (62) is partially inserted into the mounting hole (6101) and abuts against the support nut assembly (10) to cooperate with the first step (611) to limit the support nut assembly (10); the second valve body (62) is at least partially inserted into the support nut assembly (10), and the second valve body (62) forms a guide hole (602), and the valve core assembly (70) is installed in the guide hole (602); The valve core assembly (70) includes a valve needle (71), a spring sleeve (72), a wear-reducing component (73), a spring seat (74), and an elastic component (75). The outer wall of the spring sleeve (72) is slidably fitted with the inner wall of the guide hole (602). One end of the spring sleeve (72) is provided with a limiting part (721). The wear-reducing component (73) is movably installed in the spring sleeve (72) and can abut against the limiting part (721) along the axial direction. One end of the screw (20) passes through the limiting part (721) and is connected to the wear-reducing component (73). The valve needle (71) is connected to the end of the spring sleeve (72) away from the limiting part (721). The spring seat (74) and the elastic member (75) are disposed between the anti-friction member (73) and the valve needle (71). The two ends of the elastic member (75) respectively abut against the spring seat (74) and the valve needle (71) so that the spring seat (74) can abut against the anti-friction member (73) and a preset gap (701) can be formed between the spring seat (74) and the valve needle (71). The valve port (601) is located in the second valve body (62) and is connected to the guide hole (602).

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