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. A valve cavity is formed in the valve seat assembly, the valve seat assembly comprises a valve seat structure, and the valve seat structure 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 valve element assembly and the sealing structure are connected with the rod body, and the sealing structure can control opening and closing of the first valve port. When the first valve port is kept in a closed state, the rod body drives the valve element assembly to move, and the second valve port is opened or closed; and / or when the second valve port is kept in the closed state, the rod body drives the sealing structure to move, and opening or closing of the first valve port is achieved.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and more particularly to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves, as throttling elements, are used to regulate the flow and control of fluids. In existing designs, electronic expansion valves include a valve seat with two valve ports (upper and lower) inside the valve chamber. These two ports cannot be closed simultaneously, which fails to meet customer requirements.

[0003] Therefore, how to achieve simultaneous closure of the upper and lower valve ports of an electronic expansion valve has become an important issue that urgently needs to be addressed in related fields. Utility Model Content

[0004] A primary objective of this disclosure is to overcome at least one of the deficiencies of the prior art described above and to provide a solution.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0006] According to one aspect of this disclosure, an electronic expansion valve is provided, comprising a valve seat assembly, a valve core assembly, and a screw; the valve seat assembly has a valve cavity inside, and the valve seat assembly includes a valve seat structure having a first valve port and a second valve port; the valve core assembly is disposed within the valve cavity and is axially movable to control the opening and closing of the second valve port; the screw includes a rod body and a sealing structure; the valve core assembly and the sealing structure are respectively connected to the rod body, and the sealing structure controls the opening and closing of the first valve port; when the first valve port is kept closed, the rod body drives the valve core assembly to move, thereby opening or closing the second valve port; and / or, when the second valve port is kept closed, the rod body drives the sealing structure to move, thereby opening or closing the first valve port.

[0007] According to one embodiment of this disclosure, when the first valve port remains closed, the rod moves relative to the sealing structure to open or close the second valve port; and / or, when the second valve port remains closed, the rod moves relative to the valve core assembly to open or close the first valve port.

[0008] According to one embodiment of this disclosure, during the process of keeping the first valve port closed, the movement of the rod includes a first stroke. Within the first stroke range, the distance the sealing structure moves along the valve axis is zero, and the distance the rod rotates circumferentially and moves along the valve axis is greater than zero.

[0009] According to one embodiment of this disclosure, during the process of keeping the first valve port closed, the movement of the rod includes a second stroke. Within the range of the second stroke, the distance that the rod and the sealing structure move along the valve axis is zero. The circumferential rotation of the rod drives the valve core assembly to move up and down along the valve axis, thereby realizing the opening or closing of the second valve port.

[0010] According to one embodiment of this disclosure, during the process of keeping the second valve port closed, the valve core assembly moves zero distance along the valve axis, and the rod rotates circumferentially while driving the sealing structure to move up and down along the valve axis, thereby realizing the opening or closing of the first valve port.

[0011] According to one embodiment of this disclosure, the screw further includes a first stop portion, which is fixedly connected to the rod body; the sealing structure is sleeved on the rod body and located on the side of the first stop portion near the first valve port; the electronic expansion valve further includes a stop seat assembly, which is fixedly connected to the valve seat assembly on the first valve port side and sleeved on the outer periphery of the screw; the stop seat assembly includes a second stop portion that stops and cooperates with the first stop portion, the second stop portion being located on the side of the first stop portion near the first valve port; the maximum distance between the first stop portion and the second stop portion is a first gap; the maximum distance the rod body moves relative to the sealing structure is a second gap; the second gap is smaller than the first gap.

[0012] According to one embodiment of this disclosure, when the distance between the first stop and the second stop is a first gap, the rod drives the sealing structure to close the first valve port; after the first valve port is closed, the rod moves relative to the sealing structure to a distance where the first stop and the second stop abut against each other, which is a second gap; and / or, after the rod drives the valve core assembly to close the second valve port, the rod moves relative to the sealing structure to a distance where the rod abuts against the sealing structure, which is a second gap; after the rod abuts against the sealing structure, the rod continues to drive the sealing structure to a distance where the distance between the first stop and the second stop is the first gap.

[0013] According to one embodiment of this disclosure, the rod body is provided with a limiting portion, which can restrict the movement of the sealing structure relative to the rod body toward the second valve port, and the second gap is the maximum distance between the limiting portion and the sealing structure.

[0014] According to one embodiment of this disclosure, the limiting portion has a trapezoidal cross-section, with the smaller end of the trapezoid facing the second valve port. The outer diameter of the smaller end of the trapezoid is smaller than the inner diameter of the first valve port, and the outer diameter of the larger end of the trapezoid is smaller than or equal to the outer diameter of the smaller end of the corresponding trapezoid in the cross-section of the sealing structure. When the first valve port is open, at least a portion of the limiting portion is located inside the first valve port, and the rod moves axially. By adjusting the distance between the peripheral wall of the limiting portion and the inner wall of the first valve port, the flow rate of the first valve port can be adjusted.

[0015] According to one embodiment of this disclosure, the electronic expansion valve further includes a first elastic element connected to the sealing structure and the rod; when the screw moves relative to the sealing structure from the first valve port to a direction closer to the second valve port, the compression of the first elastic element increases.

[0016] According to one embodiment of this disclosure, the electronic expansion valve further includes a second bearing located on the side of the sealing structure away from the first valve port, the outer ring of the second bearing being fixedly connected to the sealing structure, and the inner ring of the second bearing being sleeved on the outer periphery of the screw; wherein the first elastic element abuts against the inner ring of the second bearing.

[0017] According to one embodiment of this disclosure, the sealing structure includes a sealing gasket; the sealing gasket seals the first valve port; the sealing gasket is sleeved on the rod body.

[0018] According to one embodiment of this disclosure, an O-ring is provided between the sealing gasket and the rod body, the sealing gasket has a third end face, and the third end face is provided with an annular groove; the O-ring is located in the annular groove; and / or, the sealing structure further includes a mounting bracket, the mounting bracket is fixedly connected to the sealing gasket, and the O-ring is sandwiched between the mounting bracket and the sealing gasket.

[0019] According to one embodiment of this disclosure, at least a portion of the cross-section of the sealing structure is trapezoidal, with the smaller end of the trapezoid facing the second valve port, the width of the smaller end of the trapezoid being less than or equal to the inner diameter of the first valve port, and the width of the larger end of the trapezoid being greater than the inner diameter of the first valve port.

[0020] According to one embodiment of this disclosure, a second elastic element is further included, which is connected to the stop assembly and the screw; when the screw moves relative to the stop assembly from the second valve port to the first valve port, the compression of the second elastic element increases.

[0021] According to one embodiment of this disclosure, the valve seat structure includes a valve seat and a valve cover; the first valve port is located on the valve seat; the rod body is threadedly engaged with the valve core assembly, the valve core assembly is provided with a sliding portion, the valve seat is provided with a guide rail portion extending parallel to the axial direction, at least a portion of the sliding portion is located within the guide rail portion and moves along the extending direction of the guide rail portion.

[0022] According to one embodiment of this disclosure, the valve core includes a first valve needle and a second valve needle; one end of the first valve needle is sealed to a second valve port; a third valve port is provided inside the first valve needle; a portion of the second valve needle is inserted into the first valve needle, and the second valve needle is sealed to the third valve port; wherein, the second valve needle is provided with a sliding portion, and the rod body is threaded to the second valve needle to drive the second valve needle to move axially, and thereby drive the first valve needle to move axially via the second valve needle.

[0023] According to one embodiment of this disclosure, the electronic expansion valve further includes a sleeve connected to the valve cover and located on the side of the valve cover opposite to the valve seat.

[0024] As can be seen from the above technical solution, the advantages and positive effects of the electronic expansion valve proposed in this disclosure are as follows:

[0025] The electronic expansion valve disclosed herein includes a valve seat assembly, a valve core assembly, and a screw. The valve seat assembly includes a valve seat structure with first and second valve ports. The valve core assembly is disposed within a valve cavity and is axially movable to control the opening and closing of the second valve port. The screw includes a rod body and a sealing structure. The valve core assembly and the sealing structure are respectively connected to the rod body, and the sealing structure controls the opening and closing of the first valve port. When the first valve port is closed, the rod body drives the valve core assembly to move, thereby opening or closing the second valve port. And / or, when the second valve port is closed, the rod body drives the sealing structure to move, thereby opening or closing the first valve port. Through the above design, this disclosure can achieve simultaneous closing of the first and second valve ports. Attached Figure Description

[0026] The various objectives, features, and advantages of this disclosure will become more apparent from the following detailed description of preferred embodiments of the disclosure taken in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0027] Figure 1 This is a three-dimensional structural schematic diagram of an electronic expansion valve according to an exemplary embodiment;

[0028] Figure 2 yes Figure 1A perspective sectional view of the electronic expansion valve is shown.

[0029] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the diagram;

[0030] Figure 4 yes Figure 1 A three-dimensional structural schematic diagram of a portion of the electronic expansion valve is shown.

[0031] Figure 5 yes Figure 4 An enlarged schematic diagram of part B in the diagram;

[0032] Figure 6 yes Figure 5 An enlarged schematic diagram of part of the structure is shown;

[0033] Figures 7 to 11 They are Figure 1 Cross-sectional views of the electronic expansion valve in several different states are shown;

[0034] Figure 12 yes Figure 7 An enlarged schematic diagram of part C in the diagram;

[0035] Figure 13 yes Figure 8 An enlarged schematic diagram of part D in the diagram;

[0036] Figure 14 yes Figure 9 An enlarged diagram of part E in the diagram.

[0037] The annotations in the attached figures are explained as follows:

[0038] 100. Valve seat assembly; 312. Limiting part;

[0039] 101. Valve chamber; 320. First stop section;

[0040] 102. First flow port; 330. Sealing structure;

[0041] 103. Second flow port; 331. Sealing gasket;

[0042] 104. Third flow outlet; 3311. Annular groove;

[0043] 1011. First valve port; 332. O-ring;

[0044] 1012. Second valve port; 333. Mounting bracket;

[0045] 110. Valve seat; 340. First elastic element;

[0046] 120. Valve cover; 350. Second bearing;

[0047] 200. Valve core assembly; 351. Outer ring;

[0048] 210. First valve needle; 352. Inner ring;

[0049] 2101. Flow cavity; 360. Second elastic element;

[0050] 2102. Lateral channel; 400. Stop seat assembly;

[0051] 2103. Third valve port; 410. Seat body;

[0052] 220. Second valve needle; 420. First bearing;

[0053] 221. Transmission unit; 421. Outer ring;

[0054] 230. Sliding part; 422. Inner ring;

[0055] 240. Third elastic element; 500. Guide seat;

[0056] 310. Rod body; 600. Sleeve;

[0057] 311. Throttling section; G1. First clearance;

[0058] G2. Second gap. Detailed Implementation

[0059] Typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can have various variations in different embodiments without departing from the scope of this disclosure, and the descriptions and drawings therein are illustrative in nature and not intended to limit this disclosure.

[0060] In the following description of various exemplary embodiments of this disclosure, reference is made to the accompanying drawings, which form part of this disclosure, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of this disclosure. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of this disclosure. Furthermore, while the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of this disclosure, these terms are used herein only for convenience, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this disclosure.

[0061] See Figure 1The illustration shows a three-dimensional structural diagram of the electronic expansion valve proposed in this disclosure. In this exemplary embodiment, the electronic expansion valve proposed in this disclosure is described using a valve applied to a refrigeration system as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of this disclosure to other application scenarios, and these changes are still within the scope of the principle of the electronic expansion valve proposed in this disclosure.

[0062] In one embodiment of this disclosure, the electronic expansion valve includes a valve seat assembly 100, a valve core assembly 200, and a screw. (See also...) Figures 2 to 14 , Figure 2 A representative three-dimensional sectional view of the electronic expansion valve is shown in the figure. Figure 3 China representatively shows Figure 2 An enlarged schematic diagram of part A in the diagram;

[0063] Figure 4 The diagram shows a three-dimensional structural schematic of a portion of the electronic expansion valve. Figure 5 China representatively shows Figure 4 An enlarged schematic diagram of part B in the diagram; Figure 6 China representatively shows Figure 5 An enlarged schematic diagram of part of the structure 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.

[0064] like Figures 1 to 14As 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 the opening and closing control of the second valve port 1012. The screw includes a rod body 310 and a sealing structure 330. The valve core assembly 200 and the sealing structure 330 are respectively connected to the rod body 310, and the sealing structure 330 enables the opening and closing control of the first valve port 1011. When the first valve port 1011 is kept closed, the rod body 310 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 body 310 drives the sealing structure 330 to move, thereby opening or closing the first valve port 1011. Through the above design, this disclosure can achieve simultaneous closure of the first valve port 1011 and 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 to open or close 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 to open or close 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 one embodiment of this disclosure, during the process of keeping the first valve port 1011 closed, the movement of the rod 310 includes a second stroke. Within the range of the second stroke, the distance that the rod 310 and the sealing structure 330 move along the valve axis is zero. The circumferential rotation of the rod 310 drives 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.

[0068] In one embodiment of this disclosure, while the second valve port 1012 is kept closed, the valve core assembly 200 moves zero distance along the valve axis, and the rod 310 rotates circumferentially while driving the sealing structure 330 to move up and down along the valve axis, thereby opening or closing the first valve port 1011.

[0069] In one embodiment of this disclosure, the rod 310 passes through the first valve port 1011 and is threadedly engaged with the valve core assembly 200 to drive the valve core assembly 200 to move axially. The screw also includes a first stop portion 320, which is fixedly connected to the rod 310. A sealing structure 330 is sleeved on the rod 310 and located on the side of the first stop portion 320 near the first valve port 1011. The electronic expansion valve proposed in this disclosure also includes a stop seat assembly 400, which is fixedly connected to the valve seat assembly 100 on the side of the first valve port 1011 and sleeved on the outer periphery of the screw. The stop seat assembly 400 includes a second stop portion that engages with the first stop portion 320 and is located on the side of the first stop portion 320 near the first valve port 1011. In the second state, the electronic expansion valve has the first stop 320 in contact with the second stop, the sealing structure 330 closing the first valve port 1011, and the valve core assembly 200 closing the second valve port 1012. In the first state, the maximum distance between the first stop 320 and the second stop is a first gap G1. The maximum distance the rod 310 moves relative to the sealing structure 330 is a second gap G2, and this second gap G2 is smaller than the first gap G1. Through the above design, this disclosure enables control of the closing of the second valve port 1012 when the first stop 320 and the second stop are in contact.

[0070] In one embodiment of this disclosure, when the distance between the first stop portion 320 and the second stop portion is a first gap G1, the rod 310 drives the sealing structure 330 to close the first valve port 1011. After the first valve port 1011 is closed, the rod 310 moves relative to the sealing structure 330 by a second gap G2 until the first stop portion 320 abuts against the second stop portion.

[0071] In one embodiment of this disclosure, after the rod 310 drives the valve core assembly 200 to close the second valve port 1012, the rod 310 moves relative to the sealing structure 330 until the distance between the rod 310 and the sealing structure 330 is the second gap G2. After the rod 310 abuts against the sealing structure 330, the rod 310 continues to drive the sealing structure 330 to move until the distance between the first stop portion 320 and the second stop portion is the first gap G1.

[0072] like Figures 3 to 6 , Figure 13 As shown, in one embodiment of this disclosure, the rod 310 may also have a limiting portion 312, which can limit the movement of the sealing structure 330 relative to the rod 310 toward the second valve port 1012, and the second gap G2 is the maximum distance between the limiting portion 312 and the sealing structure 330.

[0073] like Figure 13As shown, in one embodiment of this disclosure, the cross-section of the limiting part 312 can be trapezoidal, with the small end of the trapezoid facing 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 part 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 a portion of the limiting part 312 is located inside the first valve port 1011, and the rod 310 moves axially. 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 rate of the first valve port 1011 can be adjusted. Through the above design, this disclosure can ensure that the outer diameter of the limiting part 312 is not greater than the outer diameter of the sealing structure 330. Accordingly, when the sealing structure 330 moves toward the second valve port 1012 with the screw, this disclosure can provide a guiding function for the sealing structure 330 to close the first valve port 1011.

[0074] like Figures 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.

[0075] like Figure 3 and Figure 5As 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.

[0076] like Figure 3 , Figure 5 , Figure 6 and Figure 13 As shown, in one embodiment of this disclosure, the sealing structure 330 may include a sealing gasket 331. Specifically, the sealing gasket 331 seals the first valve port 1011. The sealing gasket 331 is fitted onto the rod body 310.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] like Figure 2 , Figure 4 and Figure 12 As shown, in one embodiment of this disclosure, the electronic expansion valve may further include a second elastic element 360, which is connected to the stop seat assembly 400 and the screw. When the screw moves relative to the stop seat assembly 400 from the second valve port 1012 towards the first valve port 1011, the compression of the second elastic element 360 increases. Specifically, after the first valve port 1011 is closed, the rod 310 moves relative to the sealing structure 330 toward the first valve port 1011, thereby increasing the compression of the first elastic element 340. The elastic force applied by the first elastic element 340 to the sealing structure 330 is directed toward the first valve port 1011, enhancing the sealing performance of the first valve port 1011.

[0081] like Figure 2 As shown, in one embodiment of this disclosure, the valve seat structure includes a valve seat 110 and a valve cover 120. The valve seat 110 is fixedly connected to the stop seat assembly 400. The first valve port 1011 is located on the valve seat 110. 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 110 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 extending direction of the guide rail portion. For example, the valve seat 110 may include a guide seat 500, the first valve port 1011 may be located on the guide seat 500, and the aforementioned guide rail portion may be provided on the guide seat 500. It should be noted that the valve seat assembly 100 in this embodiment adopts a combination design of multiple valve seat portions. In other embodiments of this disclosure, the valve seat assembly 100 may also adopt an integral valve seat structure, and is not limited to this embodiment.

[0082] like Figure 2 As shown, in one embodiment of this disclosure, the electronic expansion valve further includes a sleeve 600, which is connected to the valve cover 120 and is located on the side of the valve cover 120 facing away from the valve seat 110.

[0083] like Figure 2 As shown, in one embodiment of this disclosure, the valve cover 120 may also be provided with a first flow port 102, and other locations on the valve seat assembly 100 may also be provided with a second flow port 103 and a third flow port 104. Accordingly, when the first valve port 1011 is closed, the second flow port 102 and the third flow port 103 are connected. After the second valve port 1012 is closed, the first flow port 102 and the second flow port 103 are connected.

[0084] In one embodiment of this 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 sealed to a second valve port 1012. A third valve port 2103 is provided inside the first valve needle 210. The second valve needle 220 is partially inserted into the first valve needle 210, and the second valve needle 220 is sealed to the third valve port 2103. The second valve needle 220 is provided with a sliding portion, and a rod 310 is threadedly engaged with the second valve needle 220 to drive the second valve needle 220 to move axially, and via the second valve needle 220, drive the first valve needle 210 to move axially.

[0085] Specifically, the first valve needle 210 also has a flow cavity 2101 and a transverse channel 2102 inside. The flow cavity 2101 is located on the side of the transverse channel 2102 facing away from the second valve port 1012. At least one end of the transverse channel 2102 opens into the side of the first valve needle 210. One end of the third valve port 2103 is connected to the flow cavity 2101, and the other end of the third valve port 2103 is connected to the transverse channel 2102. The second valve needle 220 is partially inserted into the flow chamber 2101. Accordingly, the description of the electronic expansion valve in the second and first states as "valve core assembly 200 closing the second valve port 1012" specifically refers to the first valve needle 210 closing the second valve port 1012 and the second valve needle 220 closing the third valve port 2103. It should be noted that this embodiment is illustrated using the valve core assembly 200 including the first valve needle 210 and the second valve needle 220 as an example, meaning the electronic expansion valve proposed in this disclosure can be applied to a dual-valve needle structure. It should be understood that in some embodiments, the electronic expansion valve proposed in this disclosure can also be applied to a single-valve needle structure, meaning the valve core assembly 200 includes only one valve needle, and is not limited to the above embodiments.

[0086] like Figure 2 , Figures 7 to 11 As shown, based on the design of the valve core assembly 200 including a first valve needle 210 and a second valve needle 220, in one embodiment of this disclosure, a transmission part 221 may be provided on the outer periphery of the second valve needle 220. The transmission part 221 is integrally disposed with the second valve needle 220 (or it can be a separate structure). The transmission part 221 is located within the flow cavity 2101 of the first valve needle 210, and along the axial direction, the thickness of the transmission part 221 is less than the height of the flow cavity 2101. Based on this, the screw drives the second valve needle 220 to move away from the second valve port 1012, causing the transmission part 221 to abut against the side wall of the flow cavity 2101 away from the second valve port 1012, thereby driving the first valve needle 210 to move away from the second valve port 1012.

[0087] like Figure 2 and Figure 7As shown, in one embodiment of this disclosure, the electronic expansion valve may further include a third elastic member 240. The third elastic member 240 is located within the valve cavity 101, with one end abutting against the valve cover 120 and the other end abutting against the valve core assembly 200, so that the valve core assembly 200 tends to move toward the second valve port 1012.

[0088] like Figure 2 and Figure 7 As shown, in one embodiment of this disclosure, the valve core assembly may further include a sliding portion 230, and the electronic expansion valve proposed in this disclosure may further include a guide seat 500. Specifically, at least a portion of the guide seat 500 is disposed in the valve cavity 101 of the valve seat assembly 100 and is fixedly connected to the valve seat assembly 100. The sliding portion 230 is fixedly connected to the second valve needle 220, and the sliding portion 230 is slidably engaged with the guide seat 500. For example, the sliding portion 230 may be a guide nut. Based on this, the rod body 310 of the screw is threadedly engaged with the sliding portion 230. When the screw rotates, since the sliding portion 230 cannot rotate relative to the guide seat 500 but can move axially relative to the guide seat 500, rotating the screw can drive the sliding portion 230 to move axially, and thus drive the second valve needle 220 to move axially. Furthermore, when the second valve needle 220 moves toward the second valve port 1012 with the sliding part 230 until the third valve port 2103 is closed, continuing to rotate the screw to drive the second valve needle 220 toward the second valve port 1012 will cause the first valve needle 210 to move toward the second valve port 1012 together, until the first valve needle 210 moves to close the second valve port 1012. Moreover, when the second valve needle 220 moves away from the second valve port 1012 with the sliding part 230 until the transmission part 221 abuts against the side wall of the flow cavity 2101 away from the second valve port 1012, continuing to rotate the screw to drive the second valve needle 220 away from the second valve port 1012 will cause the first valve needle 210 to move away from the second valve port 1012 together. Furthermore, 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 wall of the flow chamber 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 and remains in the state of closing the second valve port 1012.

[0089] See Figures 7 to 11 As shown, Figure 7 A cross-sectional view of the electronic expansion valve in its first state is shown in detail. Figure 9 Specifically, a cross-sectional view of the electronic expansion valve in its second state is shown. Figure 8 The diagram shows a cross-sectional view of the electronic expansion valve transitioning from its first state to its second state. Figure 10 and Figure 11 Cross-sectional views are shown in detail for two different states when the electronic expansion valve transitions from the second state to the first state. The following will combine... Figures 7 to 11 The present disclosure explains the switching process and principle of the electronic expansion valve between the first state and the second state.

[0090] like Figure 7 As 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.

[0091] like Figures 9 to 11As 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.

[0092] like Figure 11 and Figure 7 As shown, after the electronic expansion valve is in the third state, with the first valve port 1011 kept closed, the screw rotates in the valve closing direction. 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.

[0093] like Figure 7 As shown, when the first valve needle 210 and the second valve needle 220 can no longer 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. The second elastic element 360 is compressed, thereby providing a preload force on the second valve port 1012 and the third valve port 2103, and the electronic expansion valve returns to the first state.

[0094] As described above, when the first valve port 1011 is not closed, 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. When the sealing structure 330 closes the first valve port 1011 and is pre-tightened, the sealing structure 330 neither rotates with the screw nor moves axially.

[0095] It should be noted that the electronic expansion valves shown in the accompanying drawings and described in this specification are merely a few examples among many electronic expansion valves capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the electronic expansion valves shown in the accompanying drawings or described in this specification.

[0096] In summary, the electronic expansion valve proposed in this 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 with first and second valve ports 1012. The valve core assembly 200 is disposed within the valve cavity 101 and can move axially to control the opening and closing of the second valve port 1012. The screw includes a rod body 310 and a sealing structure 330. The valve core assembly 200 and the sealing structure 330 are respectively connected to the rod body 310, and the sealing structure 330 can control the opening and closing of the first valve port 1011. When the first valve port 1011 is kept closed, the rod body 310 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 body 310 drives the sealing structure 330 to move, thereby opening or closing the first valve port 1011. Through the above design, this disclosure can achieve simultaneous closure of the first valve port 1011 and the second valve port 1012.

[0097] 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.

[0098] 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 in that, include: A valve seat assembly (100) has a valve chamber (101) inside. The valve seat assembly (100) includes a valve seat structure, which is provided with a first valve port (1011) and a second valve port (1012). A valve core assembly (200) is disposed in the valve cavity (101) and can move axially to realize the opening and closing control of the second valve port (1012); The screw includes a rod body (310) and a sealing structure (330); the valve core assembly (200) and the sealing structure (330) are respectively connected to the rod body (310), and the sealing structure (330) can realize the opening and closing control of the first valve port (1011); When the first valve port (1011) remains closed, the rod (310) 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) remains closed, the rod (310) drives the sealing structure (330) to move, thereby opening or closing the first valve port (1011).

2. The electronic expansion valve according to claim 1, characterized in that, When the first valve port (1011) remains closed, the rod (310) moves relative to the sealing structure (330) to open or close the second valve port (1012); and / or, when the second valve port (1012) remains closed, the rod (310) moves relative to the valve core assembly (200) to open or close the first valve port (1011).

3. The electronic expansion valve according to claim 2, characterized in that, During the process of keeping the first valve port (1011) closed, the movement 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.

4. The electronic expansion valve according to claim 2, characterized in that, During the process of keeping the first valve port (1011) closed, the movement of the rod (310) includes a second stroke. Within the second stroke range, the distance that the rod (310) and the sealing structure (330) move along the valve axis is zero. The circumferential rotation of the rod (310) drives 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).

5. The electronic expansion valve according to claim 2, characterized in that, While the second valve port (1012) remains closed, the valve core assembly (200) moves zero distance along the valve axis. The rod (310) rotates circumferentially and drives the sealing structure (330) to move up and down along the valve axis, thereby opening or closing the first valve port (1011).

6. The electronic expansion valve according to claim 1 or 2, characterized in that, The screw also includes a first stop (320), which is 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 (320) near the first valve port (1011); the electronic expansion valve also includes a stop seat assembly (400), which is fixedly connected to the valve seat assembly (100) on the side of the first valve port (1011) and sleeved on the outer periphery of the screw. The stop seat assembly (400) includes a second stop that cooperates with the first stop (320), the second stop being located on the side of the first stop (320) near the first valve port (1011); the maximum distance between the first stop (320) and the second stop is a first gap (G1); the maximum distance the rod (310) moves relative to the sealing structure (330) is a second gap (G2); the second gap (G2) is smaller than the first gap (G1).

7. The electronic expansion valve according to claim 6, characterized in that: When the distance between the first stop (320) and the second stop is the first gap (G1), the rod (310) drives the sealing structure (330) to close the first valve port (1011); after the first valve port (1011) is closed, the rod (310) moves relative to the sealing structure (330) until the distance between the first stop (320) and the second stop is the second gap (G2). And / or, after the rod (310) drives the valve core assembly (200) to close the second valve port (1012), the rod (310) moves relative to the sealing structure (330) to the distance where the rod (310) abuts against the sealing structure (330) is the second gap (G2); after the rod (310) abuts against the sealing structure (330), the rod (310) continues to drive the sealing structure (330) to the distance between the first stop (320) and the second stop is the first gap (G1).

8. The electronic expansion valve according to claim 6, characterized in that, The rod (310) is provided with a limiting part (312), which can restrict the movement of the sealing structure (330) relative to the rod (310) toward the second valve port (1012), and the second gap (G2) is the maximum distance between the limiting part (312) and the sealing structure (330).

9. The electronic expansion valve according to claim 8, characterized in that, The limiting part (312) has a trapezoidal cross-section, with the small end of the trapezoid facing 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 is smaller than or equal to the outer diameter of the small end of the corresponding trapezoid in 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 part (312) is located inside the first valve port (1011), and the rod (310) moves axially. 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 rate of the first valve port (1011) can be adjusted.

10. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a first elastic element (340), which is connected to the sealing structure (330) and the rod (310); 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.

11. The electronic expansion valve according to claim 10, characterized in that, The electronic expansion valve further includes 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. The first elastic element (340) abuts against the inner ring (352) of the second bearing (350).

12. The electronic expansion valve according to claim 1, characterized in that, The sealing structure (330) includes a sealing gasket (331); the sealing gasket (331) seals the first valve port (1011); the sealing gasket (331) is sleeved on the rod body (310).

13. The electronic expansion valve according to claim 12, characterized in that: An O-ring (332) is provided between the sealing gasket (331) and the rod body (310). The sealing gasket (331) has a third end face, and the third end face is provided with an annular groove (3311). The O-ring (332) is located within the annular groove (3311). The sealing structure (330) further includes a mounting bracket (333), which is fixedly connected to the sealing gasket (331), and the O-ring (332) is sandwiched between the mounting bracket (333) and the sealing gasket (331).

14. The electronic expansion valve according to claim 1, characterized in that, 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).

15. The electronic expansion valve according to claim 6, characterized in that, It also includes a second elastic element (360), which is connected to the stop seat assembly (400) and the screw; when the screw moves relative to the stop seat assembly (400) from the second valve port (1012) to the first valve port (1011), the compression of the second elastic element (360) increases.

16. The electronic expansion valve according to claim 1, characterized in that, The valve seat structure includes a valve seat (110) and a valve cover (120); the first valve port (1011) is located on the valve seat (110); the rod body (310) is threadedly engaged with the valve core assembly (200), the valve core assembly (200) is provided with a sliding part (230), the valve seat (110) is provided with a guide rail part extending parallel to the axial direction, 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.

17. The electronic expansion valve according to claim 16, characterized in that, 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 sealed to the second valve port (1012); a third valve port (2103) is provided inside the first valve needle (210); the second valve needle (220) is partially inserted into the first valve needle (210), and the second valve needle (220) is sealed to the third valve port (2103); wherein, the second valve needle (220) is provided with a sliding part, and the rod body (310) is threaded to the second valve needle (220) to drive the second valve needle (220) to move axially, and drive the first valve needle (210) to move axially via the second valve needle (220).

18. The electronic expansion valve according to claim 16, characterized in that, The electronic expansion valve also includes a sleeve (600) connected to the valve cover (120) and located on the side of the valve cover (120) facing away from the valve seat (110).

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