Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat assembly, a valve element assembly and a screw. The valve seat assembly comprises a valve seat structure which is provided with a first valve port and a second valve port. The valve element assembly is arranged in the valve cavity and can move in the axial direction so that opening and closing control over the second valve port can be achieved. The screw rod comprises a rod body and a sealing structure; the rod body is in threaded fit with the valve element assembly, the valve element assembly is provided with a sliding part, the valve seat structure is provided with a guide rail part extending parallel to the axial direction, and at least part of the sliding part is located in the guide rail part and moves in the extending direction of the guide rail part. The sealing structure comprises a sealing gasket, and the sealing gasket is arranged on the rod body in a sleeving mode and can control opening and closing of the first valve port. Through the design, on the basis that opening and closing control over the second valve port is achieved through the valve element assembly, opening and closing control over the first valve port is achieved through the sealing structure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of valves, in particular to an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is used as a throttling element to regulate the on-off and flow rate of fluid. In the existing design of the electronic expansion valve, the valve stem is threadedly connected with the valve core assembly, so that the valve core assembly can move axially in the valve seat when the valve stem rotates, thereby realizing the opening and closing control of the lower valve port. On this basis, if the above design is applied to the electronic expansion valve scheme with multiple valve ports, it is the main technical problem to be solved by the present disclosure. SUMMARY

[0003] One of the main purposes of the present disclosure is to overcome at least one of the defects of the prior art, and to provide an electronic expansion valve.

[0004] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, an electronic expansion valve is provided, which comprises a valve seat assembly, a valve core assembly, and a screw rod. The valve seat assembly is internally provided with a valve cavity, and comprises a valve seat structure provided with a first valve port and a second valve port. The valve core assembly is arranged in the valve cavity and can move axially to realize the opening and closing control of the second valve port. The screw rod comprises a rod body and a sealing structure. The rod body is threadedly connected with the valve core assembly. The valve core assembly is provided with a sliding part, and the valve seat structure is provided with a guide rail part extending in parallel to the axial direction. At least part of the sliding part is located in the guide rail part and moves along the extension direction of the guide rail part. The sealing structure comprises a sealing gasket, which is sleeved on the rod body and can realize the opening and closing control of the first valve port.

[0006] According to one of the embodiments of the present disclosure, an O-ring is arranged between the sealing gasket and the rod body. The sealing gasket is provided with a third end face, and the third end face is provided with an annular groove. The O-ring is located in the annular groove.

[0007] According to one of the embodiments of the present disclosure, the sealing structure further comprises a mounting bracket, which is fixedly connected with the sealing gasket. The O-ring is clamped between the mounting bracket and the sealing gasket.

[0008] According to one of the embodiments of the present disclosure, at least part of the cross section of the sealing structure is trapezoidal. The small end of the trapezoid faces the second valve port, and the width of the small end of the trapezoid is less than or equal to the inner diameter of the first valve port. The width of the large end of the trapezoid is greater than the inner diameter of the first valve port.

[0009] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a first elastic member connected between the sealing structure and the rod body; when the screw rod moves relative to the sealing structure from the first valve port to the second valve port, the compression amount of the first elastic member increases.

[0010] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a second bearing located on the side of the sealing structure away from the first valve port, the outer ring of the second bearing is fixedly connected to the sealing structure, and the inner ring of the second bearing is sleeved on the outer periphery of the screw rod; wherein the first elastic member abuts against the inner ring of the second bearing.

[0011] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a first elastic member connected between the sealing structure and the rod body; when the screw rod moves relative to the sealing structure from the first valve port to the second valve port, the compression amount of the first elastic member increases.

[0012] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a second bearing located on the side of the sealing structure away from the first valve port, the outer ring of the second bearing is fixedly connected to the sealing structure, and the inner ring of the second bearing is sleeved on the outer periphery of the screw rod; wherein the first elastic member abuts against the inner ring of the second bearing.

[0013] According to one of the embodiments of the present disclosure, when the first valve port remains in a closed state, the rod body moves relative to the sealing structure and drives the valve core assembly to move, thereby realizing the opening or closing of the second valve port; and / or, when the second valve port remains in a closed state, the rod body moves relative to the valve core assembly and drives the sealing structure to move, thereby realizing the opening or closing of the first valve port.

[0014] According to one of the embodiments of the present disclosure, during the process that the first valve port remains in a closed state, the movement process of the rod body includes a first stroke, and in the first stroke range, the distance of the sealing structure moving along the valve axis is zero, and the distance of the rod body moving along the valve axis and rotating circumferentially is greater than zero; and / or, during the process that the first valve port remains in a closed state, the movement process of the rod body includes a second stroke, and in the second stroke range, the distances of the rod body and the sealing structure moving along the valve axis are both zero, the rod body rotates circumferentially to drive the valve core assembly to move up and down along the valve axis, thereby realizing the opening or closing of the second valve port; and / or, during the process that the second valve port remains in a closed state, the distance of the valve core assembly moving along the valve axis is zero, and the rod body can drive the sealing structure to move up and down along the valve axis while rotating circumferentially, thereby realizing the opening or closing of the first valve port.

[0015] According to one of the embodiments of the present disclosure, the screw rod further comprises a first stopper fixedly connected to the rod body; the sealing structure is sleeved on the rod body and located on the side of the first stopper close to the first valve port; the electronic expansion valve further comprises a stop seat assembly fixedly connected to the side of the valve seat assembly close to the first valve port and sleeved on the outer periphery of the screw rod; the stop seat assembly comprises a second stopper in stop cooperation with the first stopper, and the second stopper is located on the side of the first stopper close to the first valve port; the maximum distance between the first stopper and the second stopper is a first gap; the maximum distance of the movement of the rod body relative to the sealing structure is a second gap; and the second gap is smaller than the first gap.

[0016] According to one of the embodiments of the present disclosure, when the distance between the first stopper and the second stopper is the first gap, the rod body drives the sealing structure to close the first valve port; after the first valve port is closed, the rod body moves relative to the sealing structure to a distance at which the first stopper and the second stopper abut, and the distance is the second gap; and / or, after the rod body drives the valve core assembly to close the second valve port, the rod body moves relative to the sealing structure to a distance at which the rod body and the sealing structure abut, and the distance is the second gap; after the rod body and the sealing structure abut, the rod body continues to drive the sealing structure to move to a distance between the first stopper and the second stopper, and the distance is the first gap.

[0017] According to one of the embodiments of the present disclosure, the rod body is provided with a limiting portion capable of limiting the movement of the sealing structure relative to the rod body towards the second valve port, and the second gap is the maximum distance between the limiting portion and the sealing structure.

[0018] According to one of the embodiments of the present disclosure, the cross section of the limiting portion is trapezoidal, the small end of the trapezoid faces the second valve port, the outer diameter of the small end of the trapezoid is smaller than the inner diameter of the first valve port, the outer diameter of the large end of the trapezoid is smaller than or equal to the outer diameter of the corresponding small end of the trapezoid of the cross section of the sealing structure; when the first valve port is in the open state, at least part of the limiting portion is located in the first valve port, the rod body moves along the axial direction, and by adjusting the distance between the peripheral wall of the limiting portion and the inner wall of the first valve port, the flow regulation of the first valve port can be realized.

[0019] From the above technical solutions, the electronic expansion valve provided by the present disclosure has the following advantages and positive effects:

[0020] The electronic expansion valve provided by the present disclosure comprises a valve seat assembly, a valve core assembly and a screw rod; the valve seat assembly comprises a valve seat structure provided with a first valve port and a second valve port; the valve core assembly is arranged in a valve cavity and can move in the axial direction to realize the opening and closing control of the second valve port; the screw rod comprises a rod body and a sealing structure; the rod body is threadedly connected with the valve core assembly; the valve core assembly is provided with a sliding part; the valve seat structure is provided with a guide rail part extending in parallel to the axial direction; at least part of the sliding part is arranged in the guide rail part and moves along the extension direction of the guide rail part; the sealing structure comprises a sealing gasket, which is sleeved on the rod body and can realize the opening and closing control of the first valve port. Through the above design, the present disclosure can realize the opening and closing control of the first valve port by the sealing structure on the basis of realizing the opening and closing control of the second valve port by the valve core assembly. BRIEF DESCRIPTION OF DRAWINGS

[0021] The various objects, features and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments of the present disclosure considered in conjunction with the drawings. The drawings are not necessarily to scale, with emphasis generally being placed upon illustrating the principles of the present disclosure. In the drawings, like numerals identify like elements throughout the several views. Among other things:

[0022] Figure 1 is a perspective structural schematic diagram of an electronic expansion valve according to an exemplary embodiment;

[0023] Figure 2 is Figure 1 a perspective sectional view of an electronic expansion valve shown in FIG. 1;

[0024] Figure 3 is Figure 2 an enlarged schematic diagram of part A in FIG. 1;

[0025] Figure 4 is Figure 1 a perspective structural schematic diagram of part structure of an electronic expansion valve shown in FIG. 1;

[0026] Figure 5 is Figure 4 an enlarged schematic diagram of part B in FIG. 1;

[0027] Figure 6 is Figure 5 an enlarged schematic diagram of part structure shown in FIG. 1;

[0028] Figures 7 to 11 are Figure 1 perspective sectional views of an electronic expansion valve in several different states shown in FIG. 1;

[0029] Figure 12 is Figure 7 an enlarged schematic diagram of part C in FIG. 1;

[0030] Figure 13 is Figure 8an enlarged schematic view of part D in FIG. 1;

[0031] Figure 14 is Figure 9 an enlarged schematic view of part E in FIG. 1.

[0032] Reference signs are explained as follows:

[0033] 100. valve seat assembly; 312. limiting portion;

[0034] 101. valve cavity; 320. first stop portion;

[0035] 102. first flow passage; 330. sealing structure;

[0036] 103. second flow passage; 331. sealing gasket;

[0037] 104. third flow passage; 3311. annular groove;

[0038] 1011. first valve port; 332. O-ring;

[0039] 1012. second valve port; 333. mounting bracket;

[0040] 110. valve seat; 340. first elastic member;

[0041] 120. valve cover; 350. second bearing;

[0042] 200. valve core assembly; 351. outer ring;

[0043] 210. first valve needle; 352. inner ring;

[0044] 2101. flow passage cavity; 360. second elastic member;

[0045] 2102. transverse passage; 400. stop seat assembly;

[0046] 2103. third valve port; 410. seat body;

[0047] 220. second valve needle; 420. first bearing;

[0048] 221. transmission portion; 421. outer ring;

[0049] 230. sliding portion; 422. inner ring;

[0050] 240. third elastic member; 500. guide seat;

[0051] 310. rod body; 600. sleeve;

[0052] 311. throttling portion; G1. first gap;

[0053] G2. Second gap. DETAILED DESCRIPTION

[0054] Embodiments embodying the features and advantages of the present disclosure will be described in detail hereinafter. It should be understood that the present disclosure can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.

[0055] In the following description of various example embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various example structures, systems, and steps in which aspects of the present disclosure can be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps can be utilized and that structural and functional modifications can be made without departing from the scope of the present disclosure. Also, while the terms "over," "between," "inside," "on," "under," "to" and the like can be used in the description herein to describe the relative positioning of particular structures as illustrated in the accompanying drawings, these terms are used here for convenience only and is not to be construed as limiting the present disclosure in any way. Nothing in this specification should be interpreted as a requirement to practice any aspect of the present disclosure in a particular spatial orientation.

[0056] Referring to Figure 1 , a perspective view of an electronic expansion valve according to the present disclosure is shown. In this example embodiment, the electronic expansion valve according to the present disclosure is described in the context of being used in a refrigeration system. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes can be made to the specific embodiments described below without departing from the principles of the electronic expansion valve according to the present disclosure.

[0057] In one embodiment of the present disclosure, the electronic expansion valve according to the present disclosure includes a valve seat assembly 100, a valve core assembly 200, and a screw rod. Referring to Figures 2 to 14 , Figure 2 , a perspective view of the electronic expansion valve is shown; Figure 3 , a perspective view of Figure 2 , an enlarged view of portion A in

[0058] Figure 4 , a perspective view of a portion of the electronic expansion valve is shown; Figure 5 , a perspective view of Figure 4 , an enlarged view of portion B in Figure 6 , a perspective view of Figure 5 , an enlarged view of the portion of the electronic expansion valve is shown;Figures 7 to 11 The cross-sectional views of the electronic expansion valve in several different states are shown in the figure. Figure 12 China representatively shows Figure 7 An enlarged schematic diagram of part C in the diagram; Figure 13 China representatively shows Figure 8 An enlarged schematic diagram of part D in the diagram; Figure 14 China representatively shows Figure 9 An enlarged schematic diagram of part E in the figure. The structure, connection method, and functional relationship of the main components of the electronic expansion valve proposed in this disclosure will be described in detail below with reference to the above figures.

[0059] like Figures 1 to 14 As shown, in one embodiment of this disclosure, the valve seat assembly 100 has a valve cavity 101 inside. The valve seat assembly 100 includes a valve seat structure with a first valve port 1011 and a second valve port 1012 arranged axially at intervals. The valve core assembly 200 is disposed in the valve cavity 101 and is axially movable, thereby enabling opening and closing control of the second valve port 1012. The screw includes a rod body 310 and a sealing structure 330. The rod body 310 is threadedly engaged with the valve core assembly 200. The valve core assembly 200 is provided with a sliding portion 230, and the valve seat structure is provided with a guide rail portion extending parallel to the axial direction. At least a portion of the sliding portion 230 is located within the guide rail portion and moves along the extension direction of the guide rail portion. The sealing structure 330 includes a sealing washer 331, which is sleeved on the rod body 310 and enables opening and closing control of the first valve port 1011. Through the above design, this disclosure can achieve the opening and closing control of the first valve port 1011 by using the sealing structure 330, based on the valve core assembly to achieve the opening and closing control of the second valve port 1012.

[0060] In one embodiment of this disclosure, an O-ring 332 is provided between the sealing gasket and the rod body 310. The sealing gasket 331 has a third end face, and an annular groove 3311 is provided on the third end face. The O-ring 332 is located within the annular groove 3311.

[0061] like Figure 3 As shown, in one embodiment of this disclosure, the sealing structure 330 further includes a mounting bracket 333, which is fixedly connected to the sealing gasket 331, and an O-ring 332 is sandwiched between the mounting bracket 333 and the sealing gasket 331.

[0062] In one embodiment of this disclosure, at least a portion of the sealing structure 330 has a trapezoidal cross-section, with the smaller end of the trapezoid facing the second valve port 1012. The width of the smaller end of the trapezoid is less than or equal to the inner diameter of the first valve port 1011, and the width of the larger end of the trapezoid is greater than the inner diameter of the first valve port 1011.

[0063] likeFigures 3 to 6 , Figure 13 As shown, in one embodiment of this disclosure, the electronic expansion valve may further include a first elastic element 340, which is connected to the sealing structure 330 and the rod 310, so that the sealing structure 330 tends to move toward the second valve port 1012. When the screw moves relative to the sealing structure 330 from the first valve port 1011 toward the direction closer to the second valve port 1012, the compression of the first elastic element 340 increases.

[0064] like Figure 3 and Figure 5 As shown, in one embodiment of this disclosure, the electronic expansion valve may further include a second bearing 350, which is located on the side of the sealing structure 330 away from the first valve port 1011. The outer ring 351 of the second bearing 350 is fixedly connected to the sealing structure 330, and the inner ring 352 of the second bearing 350 is sleeved on the outer periphery of the screw. Based on this, the first elastic member 340 can abut against the inner ring 352 of the second bearing 350 and the rod body 310. That is, the end of the first elastic member 340 near the second valve port 1012 is indirectly connected to the sealing structure 330 via the second bearing 350, and the second bearing 350 can realize relative rotation between the first elastic member 340 and the sealing structure 330. For example, when the sealing structure 330 closes the first valve port 1011 and the screw continues to rotate in the valve closing direction, the first elastic element 340 continues to rotate with the screw. The sealing structure 330 presses against the first valve port 1011 and does not rotate with the screw. The second bearing 350 can realize the relative rotation and connection between the sealing structure 330 and the first elastic element 340, avoiding the phenomenon that one end of the first elastic element 340 rotates while the other end cannot rotate, avoiding the torsional deformation or even breakage of the first elastic element 340 caused by this, and ensuring that the first elastic element 340 applies force to the sealing structure 330 so that it maintains the tendency to move towards the second valve port 1012.

[0065] In one embodiment of this disclosure, when the first valve port 1011 is kept closed, the rod 310 moves relative to the sealing structure 330 and drives the valve core assembly 200 to move, thereby opening or closing the second valve port 1012; and / or, when the second valve port 1012 is kept closed, the rod 310 moves relative to the valve core assembly 200 and drives the sealing structure 330 to move, thereby opening or closing the first valve port 1011.

[0066] In one embodiment of this disclosure, during the process of the first valve port 1011 being kept closed, the movement process of the rod 310 includes a first stroke. Within the first stroke range, the distance that the sealing structure 330 moves along the valve axis is zero, and the distance that the rod 310 rotates circumferentially and moves along the valve axis is greater than zero.

[0067] In an embodiment of the present disclosure, during the process that the first valve port 1011 remains in the closed state, the movement of the rod body 310 includes a second stroke, in which the rod body 310 and the sealing structure 330 are both axially stationary, and the rotation of the rod body 310 drives the valve core assembly 200 to move up and down along the valve axis, thereby opening or closing the second valve port 1012.

[0068] In an embodiment of the present disclosure, during the process that the second valve port 1012 remains in the closed state, the valve core assembly 200 is axially stationary, and the rotation of the rod body 310 drives the sealing structure 330 to move up and down along the valve axis, thereby opening or closing the first valve port 1011.

[0069] In an embodiment of the present disclosure, the rod body 310 passes through the first valve port 1011 and is threadedly connected with the valve core assembly 200 to drive the valve core assembly 200 to move axially. The screw rod further includes a first stop portion 320 fixedly connected to the rod body 310. The sealing structure 330 is sleeved on the rod body 310 and located on the side of the first stop portion 320 close to the first valve port 1011. The electronic expansion valve further includes a stop seat assembly 400 fixedly connected to the side of the valve seat assembly 100 close to the first valve port 1011 and sleeved on the outer periphery of the screw rod. The stop seat assembly 400 includes a second stop portion in stop cooperation with the first stop portion 320, which is located on the side of the first stop portion 320 close to the first valve port 1011. In the second state of the electronic expansion valve, the first stop portion 320 is in contact with the second stop portion, the sealing structure 330 closes the first valve port 1011, and the valve core assembly 200 closes the second valve port 1012. In the first state of the electronic expansion valve, the maximum distance between the first stop portion 320 and the second stop portion is a first gap G1. The maximum distance of the movement of the rod body 310 relative to the sealing structure 330 is a second gap G2, which is smaller than the first gap G1. Through the above design, the present disclosure can control the closing of the second valve port 1012 when the first stop portion 320 and the second stop portion are in abutment.

[0070] In an embodiment of the present disclosure, when the distance between the first stop portion 320 and the second stop portion is the first gap G1, the rod body 310 drives the sealing structure 330 to close the first valve port 1011. After the first valve port 1011 is closed, the rod body 310 moves relative to the sealing structure 330 by the second gap G2 until the first stop portion 320 and the second stop portion are in abutment.

[0071] In an embodiment of the present disclosure, after the stem 310 drives the valve core assembly 200 to close the second valve port 1012, the stem 310 moves relative to the sealing structure 330 to a distance at which the stem 310 abuts against the sealing structure 330, which is the second gap G2. After the stem 310 abuts against the sealing structure 330, the stem 310 continues to drive the sealing structure 330 to move to a distance between the first stop 320 and the second stop, which is the first gap G1.

[0072] As shown in Figures 3 to 6 , Figure 13 In an embodiment of the present disclosure, the stem 310 can further have a limiting portion 312, which can limit the movement of the sealing structure 330 relative to the stem 310 towards the second valve port 1012. The second gap G2 is the maximum distance between the limiting portion 312 and the sealing structure 330.

[0073] As shown in Figure 13 In an embodiment of the present disclosure, the cross section of the limiting portion 312 can be trapezoidal, the small end of the trapezoid faces the second valve port 1012, the outer diameter of the small end of the trapezoid is smaller than the inner diameter of the first valve port 1011, and the outer diameter of the large end of the trapezoid corresponding to the cross section of the limiting portion 312 is smaller than or equal to the outer diameter of the small end of the trapezoid corresponding to the cross section of the sealing structure 330. When the first valve port 1011 is in the open state, at least part of the limiting portion 312 is located in the first valve port 1011, and the stem 310 moves in the axial direction. By adjusting the distance between the peripheral wall of the limiting portion 312 and the inner wall of the first valve port 1011, the flow rate of the first valve port 1011 can be adjusted. Through the above design, the present disclosure can ensure that the outer diameter of the limiting portion 312 is not greater than the outer diameter of the sealing structure 330. Accordingly, when the sealing structure 330 moves towards the second valve port 1012 along the screw, the present disclosure can provide a guiding function for the sealing of the sealing structure 330 to the first valve port 1011.

[0074] As shown in Figure 2 , Figure 4 and Figure 12 In an embodiment of the present disclosure, the electronic expansion valve provided by the present disclosure can further include a second elastic member 360 connected to the stop seat assembly 400 and the screw. When the screw moves relative to the stop seat assembly 400 in the direction from the second valve port 1012 to the first valve port 1011, the compression amount of the second elastic member 360 increases. Specifically, after the first valve port 1011 is closed, the stem 310 moves relative to the sealing structure 330 towards the first valve port 1011, so that the compression degree of the first elastic member 340 increases, and the elastic force exerted by the first elastic member 340 on the sealing structure 330 is directed towards the first valve port 1011, thereby enhancing the sealing performance of the first valve port 1011.

[0075] As shown in Figure 2As shown in the embodiment of the present disclosure, the valve seat structure includes a valve seat 110 and a valve cover 120. The valve seat 110 is fixedly connected with the stop seat assembly 400. The first valve port 1011 is located on the valve seat 110. The stem 310 is threadedly connected with the valve core assembly 200, and the valve core assembly 200 is provided with a sliding part 230. The valve seat 110 is provided with a guide rail part extending in parallel to the axial direction, and at least part of the sliding part 230 is located in the guide rail part and moves along the extension direction of the guide rail part. For example, the valve seat 110 can include a guide seat 500, the first valve port 1011 can be located on the guide seat 500, and the guide rail part can be arranged on the guide seat 500. It should be noted that the valve seat assembly 100 in the embodiment is designed in a combined manner of multiple valve seat parts. In other embodiments of the present disclosure, the valve seat assembly 100 can also adopt an integrated valve seat structure, and is not limited to the embodiment.

[0076] As shown in the embodiment of the present disclosure, the valve seat structure includes a valve seat 110 and a valve cover 120. The valve seat 110 is fixedly connected with the stop seat assembly 400. The first valve port 1011 is located on the valve seat 110. The stem 310 is threadedly connected with the valve core assembly 200, and the valve core assembly 200 is provided with a sliding part 230. The valve seat 110 is provided with a guide rail part extending in parallel to the axial direction, and at least part of the sliding part 230 is located in the guide rail part and moves along the extension direction of the guide rail part. For example, the valve seat 110 can include a guide seat 500, the first valve port 1011 can be located on the guide seat 500, and the guide rail part can be arranged on the guide seat 500. It should be noted that the valve seat assembly 100 in the embodiment is designed in a combined manner of multiple valve seat parts. In other embodiments of the present disclosure, the valve seat assembly 100 can also adopt an integrated valve seat structure, and is not limited to the embodiment. Figure 2 As shown in the embodiment of the present disclosure, the valve seat structure includes a valve seat 110 and a valve cover 120. The valve seat 110 is fixedly connected with the stop seat assembly 400. The first valve port 1011 is located on the valve seat 110. The stem 310 is threadedly connected with the valve core assembly 200, and the valve core assembly 200 is provided with a sliding part 230. The valve seat 110 is provided with a guide rail part extending in parallel to the axial direction, and at least part of the sliding part 230 is located in the guide rail part and moves along the extension direction of the guide rail part. For example, the valve seat 110 can include a guide seat 500, the first valve port 1011 can be located on the guide seat 500, and the guide rail part can be arranged on the guide seat 500. It should be noted that the valve seat assembly 100 in the embodiment is designed in a combined manner of multiple valve seat parts. In other embodiments of the present disclosure, the valve seat assembly 100 can also adopt an integrated valve seat structure, and is not limited to the embodiment.

[0077] As shown in the embodiment of the present disclosure, the valve seat structure includes a valve seat 110 and a valve cover 120. The valve seat 110 is fixedly connected with the stop seat assembly 400. The first valve port 1011 is located on the valve seat 110. The stem 310 is threadedly connected with the valve core assembly 200, and the valve core assembly 200 is provided with a sliding part 230. The valve seat 110 is provided with a guide rail part extending in parallel to the axial direction, and at least part of the sliding part 230 is located in the guide rail part and moves along the extension direction of the guide rail part. For example, the valve seat 110 can include a guide seat 500, the first valve port 1011 can be located on the guide seat 500, and the guide rail part can be arranged on the guide seat 500. It should be noted that the valve seat assembly 100 in the embodiment is designed in a combined manner of multiple valve seat parts. In other embodiments of the present disclosure, the valve seat assembly 100 can also adopt an integrated valve seat structure, and is not limited to the embodiment. Figure 2

[0078] In the embodiment of the present disclosure, the valve core assembly 200 includes a first valve needle 210 and a second valve needle 220. One end of the first valve needle 210 is sealingly connected with the second valve port 1012. The first valve needle 210 is internally provided with a third valve port 2103. The second valve needle 220 is partially inserted into the first valve needle 210, and the second valve needle 220 is sealingly connected with the third valve port 2103. The second valve needle 220 is provided with a sliding part, and the stem 310 is threadedly connected with the second valve needle 220 to drive the second valve needle 220 to move in the axial direction, and drive the first valve needle 210 to move in the axial direction through the second valve needle 220.

[0079] ​Specifically, the first valve needle 210 is further provided with a flow cavity 2101 and a transverse channel 2102. The flow cavity 2101 is located on the side of the transverse channel 2102 away from the second valve port 1012. At least one end of the transverse channel 2102 is open to the side of the first valve needle 210. One end of the third valve port 2103 is communicated with the flow cavity 2101, and the other end of the third valve port 2103 is communicated with the transverse channel 2102. The second valve needle 220 is partially inserted into the flow cavity 2101. Accordingly, the so-called "valve core assembly 200 closes the second valve port 1012" state description of the electronic expansion valve in the second state and the first state, specifically refers to that the first valve needle 210 closes the second valve port 1012, and the second valve needle 220 closes the third valve port 2103. It should be noted that in the embodiment, the valve core assembly 200 includes the first valve needle 210 and the second valve needle 220, that is, the electronic expansion valve provided by the present disclosure can be applied to a double-valve needle structure. It should be understood that in some embodiments, the electronic expansion valve provided by the present disclosure can also be applied to a single-valve needle structure, that is, the valve core assembly 200 only includes one valve needle, and is not limited to the above-mentioned embodiment.

[0080] As shown in Figure 2 , Figures 7 to 11 , based on the design that the valve core assembly 200 includes the first valve needle 210 and the second valve needle 220, in an embodiment of the present disclosure, the outer periphery of the second valve needle 220 can be provided with a transmission part 221, which is integrally arranged with the second valve needle 220 (which can also be a separate structure). Wherein, the transmission part 221 is located in the flow cavity 2101 of the first valve needle 210, and in the axial direction, the thickness of the transmission part 221 is less than the height of the flow cavity 2101. On this basis, the screw drives the second valve needle 220 to move away from the second valve port 1012, so that the transmission part 221 abuts against the cavity wall of the flow cavity 2101 away from the second valve port 1012, to drive the first valve needle 210 to move away from the second valve port 1012.

[0081] As shown in Figure 2 and Figure 7 , in an embodiment of the present disclosure, the electronic expansion valve provided by the present disclosure can further include a third elastic member 240. The third elastic member 240 is located in the valve cavity 101, one end of the third elastic member 240 abuts against the valve cover 120, and the other end of the third elastic member 240 abuts against the valve core assembly 200, so that the valve core assembly 200 has a tendency to move towards the second valve port 1012.

[0082] As shown in Figure 2 and Figure 7As shown, in an embodiment of the present disclosure, the valve core assembly can further include a sliding part 230, and the electronic expansion valve proposed by the present disclosure can further include a guide part. Specifically, at least part of the guide seat 500 is arranged in the valve cavity 101 of the valve seat assembly 100 and fixedly connected with the valve seat assembly 100. The sliding part 230 is fixedly connected with the second valve needle 220, and the sliding part 230 is in sliding fit with the guide seat 500. For example, the sliding part 230 can be a guide nut. On this basis, the rod body 310 of the screw rod is in threaded fit with the sliding part 230. When the screw rod is rotated, the sliding part 230 cannot rotate relative to the guide seat 500 but can move axially relative to the guide seat 500, so that the sliding part 230 can be driven to move axially by rotating the screw rod, and the second valve needle 220 is driven to move axially. In addition, when the second valve needle 220 moves with the sliding part 230 towards the second valve port 1012 until the third valve port 2103 is closed, if the screw rod is continuously rotated to drive the second valve needle 220 to move towards the second valve port 1012, the first valve needle 210 can be driven to move towards the second valve port 1012 together with the second valve needle 220 until the first valve needle 210 moves to close the second valve port 1012. Furthermore, when the second valve needle 220 moves with the sliding part 230 away from the second valve port 1012 until the transmission part 221 abuts against the side cavity wall of the flow-through cavity 2101 away from the second valve port 1012, if the screw rod is continuously rotated to drive the second valve needle 220 to move away from the second valve port 1012, the first valve needle 210 can be driven to move away from the second valve port 1012 together with the second valve needle 220. In addition, when the second valve needle 220 does not move to the third valve port 2103 and the transmission part 221 does not abut against the side cavity wall of the flow-through cavity 2101 away from the second valve port 1012, the second valve needle 220 moves axially with the sliding part 230, but the first valve needle 210 is not driven by the second valve needle 220 to keep closing the second valve port 1012.

[0083] Referring to Figures 7 to 11 As shown, Figure 7 Specifically shown is a cross-sectional view of the electronic expansion valve in the first state, Figure 9 Specifically shown is a cross-sectional view of the electronic expansion valve in the second state, Figure 8 Specifically shown is a cross-sectional view of the electronic expansion valve in the first state, Figure 10 and Figure 11 Specifically shown are cross-sectional views of the electronic expansion valve in two different states when the electronic expansion valve is converted from the second state to the first state. The conversion process and principle of the electronic expansion valve proposed by the present disclosure between the first state and the second state will be described below Figures 7 to 11 Specifically shown is a cross-sectional view of the electronic expansion valve in the first state,

[0084] As Figure 7As shown, the electronic expansion valve is in its first state. In this state, the first stop portion 320 and the second stop portion of the screw (i.e., between the end face of the first stop portion 320 facing the first valve port 1011 and the first end face of the first bearing 420) are axially separated by a certain distance, namely, a first gap G1. At this time, the first valve port 1011 is open, and the second valve port 1012 and the third valve port 2103 are both closed. Figures 7 to 9 As shown, after the electronic expansion valve is in the first state, the screw rotates in the valve opening direction and moves axially toward the second valve port 1012. During this movement, the sealing structure 330 (including, for example, a sealing gasket 331 and an O-ring 332) and the second bearing 350 move axially with the screw until the sealing structure 330 moves to the first valve port 1011 and closes the first valve port 1011. At this time, the first valve port 1011 is not pre-tightened by the sealing structure 330. When the screw rotates, since the screw can still move axially, the valve core assembly 200 remains stationary. Specifically, the screw continues to move axially toward the second valve port 1012 (the sealing structure 330 and the second bearing 350 no longer move axially with the screw) until the first stop 320 abuts against the second stop, and the first elastic member 340 is in a compressed state. Thus, the first elastic member 340 can be used to apply a pre-tightening force to the first valve port 1011 via the second bearing 350 and the sealing structure 330. At this time, the first valve port 1011, the second valve port 1012 and the third valve port 2103 are all closed.

[0085] like Figures 9 to 11 As shown, after the electronic expansion valve is in the second state, both the second valve port 1012 and the third valve port 2103 are closed. The first stop part 320 abuts against the second stop part, preventing the screw from moving further toward the second valve port 1012. Simultaneously, as the screw rotates, the sliding part 230 drives the second valve needle 220 to move away from the second valve port 1012 until the third valve port 2103 opens. During this process, the first valve needle 210 does not move with the second valve needle 220 and remains closed to the second valve port 1012. Afterwards, the second valve needle 220 continues to move away from the second valve port 1012 until the transmission part 221 abuts against the side wall of the flow chamber 2101 away from the second valve port 1012, thereby driving the first valve needle 210 to move away from the second valve port 1012 and disengage from it, opening the second valve port 1012. The above process can also be understood as the third state of the electronic expansion valve, that is, the electronic expansion valve in the third state can include two states: one is "the first valve port 1011 is closed, the second valve port 1012 is closed, and the third valve port 2103 is open", that is Figure 10 The first state shown indicates that flow regulation can be performed; the second state is "first valve port 1011 is closed, second valve port 1012 and third valve port 2103 are both open", meaning... Figure 11 The state shown.

[0086] likeFigure 11 and Figure 7 As shown in FIG. 10, after the electronic expansion valve is in the third state, the screw rotates in the closing direction of the valve in the state that the first valve port 1011 remains closed, and the second valve needle 220 first closes the third valve port 2103, and then the second valve needle 220 drives the first valve needle 210 to close the second valve port 1012.

[0087] As shown in FIG. 11, when the first valve needle 210 and the second valve needle 220 cannot continue to move toward the second valve port 1012, the screw moves axially away from the second valve port 1012 and drives the sealing structure 330 to disengage from the first valve port 1011, and the second elastic member 360 is compressed to provide a pre-tightening force to the second valve port 1012 and the third valve port 2103, and the electronic expansion valve returns to the first state again. Figure 7 As described above, when the sealing structure 330 does not close the first valve port 1011, the sealing structure 330 rotates with the screw and moves axially, when the first valve port 1011 is closed by the sealing structure 330 but not pre-tightened, the sealing structure 330 still rotates with the screw but does not move axially, and when the sealing structure 330 closes the first valve port 1011 and is pre-tightened, the sealing structure 330 does not rotate with the screw and does not move axially.

[0088] It should be noted that the electronic expansion valve shown in the drawings and described in the specification is only a few examples of many electronic expansion valves that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the electronic expansion valve shown in the drawings or described in the specification.

[0089] In summary, the electronic expansion valve disclosed in the present disclosure includes a valve seat assembly 100, a valve core assembly 200, and a screw; the valve seat assembly 100 includes a valve seat structure provided with a first valve port 1011 and a second valve port 1012; the valve core assembly 200 is arranged in the valve cavity 101 and can move axially to achieve opening and closing control of the second valve port 1012; the screw includes a rod body 310 and a sealing structure 330; the rod body 310 is threadedly connected with the valve core assembly 200, the valve core assembly 200 is provided with a sliding portion 230, the valve seat structure is provided with a guide rail portion extending parallel to the axial direction, and at least part of the sliding portion 230 is located in the guide rail portion and moves along the extension direction of the guide rail portion; the sealing structure 330 includes a sealing gasket 331, the sealing gasket 331 is sleeved on the rod body 310, and the sealing gasket 331 can achieve opening and closing control of the first valve port 1011. Through the above design, the present disclosure can achieve opening and closing control of the first valve port 1011 by using the sealing structure 330 on the basis of achieving opening and closing control of the second valve port 1012 by using the valve core assembly 200.

[0090]

[0091] ​The exemplary embodiments of the electronic expansion valve proposed in this disclosure have been described and / or illustrated in detail above. However, the embodiments of this disclosure are not limited to the specific embodiments described herein; rather, components and / or steps of each embodiment may be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment may also be used in combination with other components and / or steps of other embodiments. In describing the elements / components / etc. described and / or illustrated herein, the terms “a,” “an,” and “the above” are used to indicate the presence of one or more elements / components / etc. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to those listed. Furthermore, the terms “first” and “second” in the claims and description are used only as illustrative marks and are not intended to limit the numerical scope of the object.

[0092] Although the electronic expansion valve proposed in this disclosure has been described according to different specific embodiments, those skilled in the art will recognize that modifications may be made to the implementation of this disclosure within the spirit and scope of the claims.

Claims

1. An electronic expansion valve characterized by, The utility model relates to an electronic expansion valve, including: Valve seat assembly (100) internally provided with valve cavity (101), the valve seat assembly (100) includes valve seat structure, the valve seat structure is provided with first valve port (1011) and second valve port (1012); Valve core assembly (200) is arranged in the valve cavity (101) and can move along the axial direction to realize the open-close control to the second valve port (1012); Screw rod, including the rod body (310) and sealing structure (330), the rod body (310) is screwed with the valve core assembly (200), the valve core assembly (200) is provided with sliding part (230), the valve seat structure is provided with the guide rail part extending in parallel to the axial direction, at least part sliding part (230) is located in the guide rail part and along the extension direction of the guide rail part is active, the sealing structure (330) includes sealing washer (331), the sealing washer (331) is set in the rod body (310), the sealing washer (331) can realize the open-close control to the first valve port (1011).

2. The electronic expansion valve according to claim 1, characterized in that O ring (332) is arranged between the sealing washer (331) and the rod body (310), the sealing washer (331) has third end face, the third end face is provided with annular groove (3311), the O ring (332) is located in the annular groove (3311).

3. The electronic expansion valve according to claim 2, characterized in that The sealing structure (330) further includes mounting bracket (333), the mounting bracket (333) is fixedly connected with the sealing washer (331), and the O ring (332) is clamped between the mounting bracket (333) and the sealing washer (331).

4. The electronic expansion valve according to claim 1, wherein At least part of the cross section of the sealing structure (330) is trapezoidal, the small end of the trapezoidal is towards the second valve port (1012), the width of the small end of the trapezoidal is less than or equal to the inner diameter of the first valve port (1011), and the width of the large end of the trapezoidal is greater than the inner diameter of the first valve port (1011).

5. The electronic expansion valve according to claim 1, wherein The electronic expansion valve further includes a first elastic member (340) connected to the sealing structure (330) and the rod body (310), and when the screw rod moves relative to the sealing structure (330) from the first valve port (1011) to the direction close to the second valve port (1012), the compression amount of the first elastic member (340) increases.

6. The electronic expansion valve according to claim 5, wherein The electronic expansion valve further includes a second bearing (350) located on the side of the sealing structure (330) away from the first valve port (1011), the outer ring (351) of the second bearing (350) is fixedly connected to the sealing structure (330), and the inner ring (352) of the second bearing (350) is sleeved on the outer periphery of the screw rod, wherein the first elastic member (340) abuts against the inner ring (352) of the second bearing (350).

7. The electronic expansion valve according to claim 1, wherein The electronic expansion valve further comprises a first elastic member (340) connected to the sealing structure (330) and the rod body (310); when the screw rod moves relative to the sealing structure (330) in a direction from the first valve port (1011) to the second valve port (1012), the compression amount of the first elastic member (340) increases.

8. The electronic expansion valve according to claim 7, characterized in that The electronic expansion valve further comprises a second bearing (350) located on a side of the sealing structure (330) away from the first valve port (1011), wherein an outer ring (351) of the second bearing (350) is fixedly connected to the sealing structure (330), and an inner ring (352) of the second bearing (350) is sleeved on the outer periphery of the screw rod; and the first elastic member (340) abuts against the inner ring (352) of the second bearing (350).

9. The electronic expansion valve according to any one of claims 1 to 8, characterized in that When the first valve port (1011) remains in a closed state, the rod body (310) moves relative to the sealing structure (330) and drives the valve core assembly (200) to move, thereby realizing the opening or closing of the second valve port (1012); and / or when the second valve port (1012) remains in a closed state, the rod body (310) moves relative to the valve core assembly (200) and drives the sealing structure (330) to move, thereby realizing the opening or closing of the first valve port (1011).

10. The electronic expansion valve according to claim 9, wherein: During the process in which the first valve port (1011) remains in a closed state, the movement process of the rod body (310) includes a first stroke, and in the first stroke range, the distance of the sealing structure (330) moving along the valve axis is zero, and the distance of the rod body (310) moving along the valve axis and rotating circumferentially is greater than zero; and / or During the process in which the first valve port (1011) remains in a closed state, the movement process of the rod body (310) includes a second stroke, and in the second stroke range, the distance of the rod body (310) and the sealing structure (330) moving along the valve axis is zero, the rod body (310) rotates circumferentially to drive the valve core assembly (200) to move up and down along the valve axis, thereby realizing the opening or closing of the second valve port (1012); and / or During the process in which the second valve port (1012) remains in a closed state, the distance of the valve core assembly (200) moving along the valve axis is zero, and the rod body (310) rotates circumferentially while driving the sealing structure (330) to move up and down along the valve axis, thereby realizing the opening or closing of the first valve port (1011).

11. The electronic expansion valve according to claim 9, wherein The screw further comprises a first stop portion (320) fixedly connected to the rod body (310); the sealing structure (330) is sleeved on the rod body (310) and located on the side of the first stop portion (320) close to the first valve port (1011); the electronic expansion valve further comprises a stop seat assembly (400) fixedly connected to the side of the first valve port (1011) of the valve seat assembly (100) and sleeved on the outer periphery of the screw; the stop seat assembly (400) comprises a second stop portion in abutting cooperation with the first stop portion (320), and the second stop portion is located on the side of the first stop portion (320) close to the first valve port (1011); the maximum distance between the first stop portion (320) and the second stop portion is a first gap (G1); the maximum distance of the movement of the rod body (310) relative to the sealing structure (330) is a second gap (G2); the second gap (G2) is smaller than the first gap (G1).

12. The electronic expansion valve according to claim 11, characterized in that: When the distance between the first stop portion (320) and the second stop portion is the first gap (G1), the rod body (310) drives the sealing structure (330) to close the first valve port (1011); after the first valve port (1011) is closed, the rod body (310) moves relative to the sealing structure (330) to the distance at which the first stop portion (320) and the second stop portion abut, which is the second gap (G2); And / or, after the rod body (310) drives the valve core assembly (200) to close the second valve port (1012), the rod body (310) moves relative to the sealing structure (330) to the distance at which the rod body (310) and the sealing structure (330) abut, which is the second gap (G2); after the rod body (310) and the sealing structure (330) abut, the rod body (310) continues to drive the sealing structure (330) to move to the distance between the first stop portion (320) and the second stop portion, which is the first gap (G1).

13. The electronic expansion valve of claim 11, wherein, The rod body (310) is provided with a limiting portion (312) capable of limiting the movement of the sealing structure (330) relative to the rod body (310) towards the second valve port (1012), and the second gap (G2) is the maximum distance between the limiting portion (312) and the sealing structure (330).

14. The electronic expansion valve according to claim 13, wherein The cross section of the limiting part (312) is trapezoidal, the small end of the trapezoidal shape faces the second valve port (1012), the outer diameter of the small end of the trapezoidal shape is smaller than the inner diameter of the first valve port (1011), the outer diameter of the large end of the trapezoidal shape is smaller than or equal to the outer diameter of the corresponding small end of the trapezoidal shape of the cross section of the sealing structure (330); when the first valve port (1011) is in an open state, at least part of the limiting part (312) is located in the first valve port (1011), the rod body (310) moves along the axial direction, and by adjusting the distance between the peripheral wall of the limiting part (312) and the inner wall of the first valve port (1011), the flow regulation of the first valve port (1011) can be realized.

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