Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat assembly and a guide seat. The valve seat assembly is provided with a valve cavity, and the valve cavity is provided with a first valve port. At least part of the guide seat is arranged in the valve cavity and is fixedly connected with the valve seat assembly; wherein one of the valve seat assembly and the guide seat, which is higher in material hardness, is provided with a positioning bulge, the positioning bulge is pressed against the other one of the valve seat assembly and the guide seat, and the material hardness of the positioning bulge is greater than that of the valve seat assembly or the guide seat which is propped against the positioning bulge, so that the valve seat assembly and the guide seat are positioned in the axial direction and the circumferential direction. Through the structural design, relative rotation of the guide seat and the valve seat assembly in the circumferential direction or relative displacement in the axial direction can be avoided, and reliable positioning of the guide seat is achieved.

Description

Technical Field

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

[0002] As a throttling element, an electronic expansion valve is used to regulate the on-off and flow rate of a fluid. In the existing design of an electronic expansion valve, the valve core assembly of the electronic expansion valve is arranged in the valve cavity of the valve seat to realize the opening and closing of the valve port. A guide seat is also arranged in the valve cavity, and another part of the valve core assembly passes through the guide seat, and the guide seat can guide the axial movement of the valve core assembly. Accordingly, as a key component for guiding the movement of the valve core assembly, how to position the guide seat in the valve cavity has become an important issue affecting the functional stability and reliability of the electronic expansion valve. Summary of the Utility Model

[0003] A main object of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and to provide an electronic expansion valve capable of stably positioning a guide seat.

[0004] To achieve the above object, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, there is provided an electronic expansion valve, wherein: the electronic expansion valve includes a valve seat assembly and a guide seat; the valve seat assembly is provided with a valve cavity, and the valve cavity is provided with a first valve port; at least a part of the guide seat is arranged in the valve cavity and fixedly connected to the valve seat assembly; wherein, a positioning protrusion is provided on the one with a greater material hardness among the valve seat assembly and the guide seat, the positioning protrusion presses against the other one, and the material hardness of the positioning protrusion is greater than the material hardness of the valve seat assembly or the guide seat it abuts against, so as to position the valve seat assembly and the guide seat axially and circumferentially.

[0006] According to one embodiment of the present disclosure, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and on the reference plane, the orthographic projection of the positioning protrusion is a closed ring.

[0007] According to one embodiment of the present disclosure, the cross section of the positioning protrusion is triangular, trapezoidal, rectangular or arc-shaped.

[0008] According to one embodiment of the present disclosure, the cavity wall of the valve cavity is provided with a first positioning surface facing the guide seat, and the guide seat has a second positioning surface facing the first positioning surface; and the positioning protrusion is located on one of the first positioning surface and the second positioning surface, and the positioning protrusion abuts against the other one.

[0009] According to one embodiment of the present disclosure, at least two of the positioning protrusions are provided on the first positioning surface or the second positioning surface; wherein, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and on the reference plane, the orthographic projections of at least two of the positioning protrusions are arranged at intervals along a closed annular path.

[0010] According to one embodiment of the present disclosure, the shapes of the positioning protrusions are the same, and they are arranged uniformly along the annular path.

[0011] According to one embodiment of the present disclosure, at least two of the positioning protrusions are provided on the first positioning surface or the second positioning surface, and at least two of the positioning protrusions are arranged at intervals in the radial direction.

[0012] According to one embodiment of the present disclosure, the valve seat assembly includes a valve core sleeve and a valve cover connected axially. The valve core sleeve is provided with a first cavity penetrating axially, and the valve cover is provided with a second cavity penetrating axially. The first valve port is provided at one end of the valve core sleeve facing away from the valve cover; wherein, an end face portion of the valve core sleeve facing the valve cover forms the first positioning surface.

[0013] According to one embodiment of the present disclosure, the positioning protrusions are provided on the first positioning surface. The valve core sleeve is provided with a first opening at one end facing the valve cover, and the first opening communicates with the first cavity, so that the end face of the valve core sleeve facing the valve cover is annular; wherein, the positioning protrusions are provided at the inner edge of the end face.

[0014] According to one embodiment of the present disclosure, the cavity wall of the first cavity at the first opening is provided with an inclined surface, and the inclined surface and the side surface of the positioning protrusion are connected as an integral guiding inclined surface.

[0015] According to one embodiment of the present disclosure, the cavity wall of the second cavity is provided with a third positioning surface, and the third positioning surface faces the first positioning surface and is arranged at intervals axially, so that a positioning chamber is formed in the valve chamber between the first positioning surface and the third positioning surface; a positioning boss is provided on the outer periphery of the guiding seat, and at least a part of the positioning boss is received in the positioning chamber. The positioning boss has a fourth positioning surface facing the valve cover, and the fourth positioning surface presses against the third positioning surface.

[0016] As can be seen from the above technical solutions, the advantages and positive effects of the electronic expansion valve proposed by the present disclosure are as follows:

[0017] The electronic expansion valve proposed by the present disclosure includes a valve seat assembly and a guide seat; the valve seat assembly is provided with a valve cavity, and the valve cavity is provided with a first valve port; at least a part of the guide seat is disposed in the valve cavity and fixedly connected to the valve seat assembly; wherein, a positioning protrusion is provided on the one with a greater material hardness among the valve seat assembly and the guide seat, the positioning protrusion presses against the other one, and the material hardness of the positioning protrusion is greater than the material hardness of the valve seat assembly or the guide seat against which it abuts, so as to position the valve seat assembly and the guide seat axially and circumferentially. Through the above structural design, the present disclosure can utilize the positioning protrusion to press against the valve seat assembly or the guide seat to cause it to deform, whereby the deformed guide seat and the valve seat assembly are in a circumferential limiting fit, avoiding relative rotation or relative displacement of the guide seat and the valve seat assembly along the circumferential direction, and realizing reliable positioning of the guide seat. Brief Description of the Drawings

[0018] By considering the following detailed description of the preferred embodiments of the present disclosure in conjunction with the drawings, various objectives, features, and advantages of the present disclosure will become more apparent. The drawings are only exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0019] Figure 1 is a perspective structural schematic diagram of an electronic expansion valve shown according to an exemplary embodiment;

[0020] Figure 2 is Figure 1 an axonometric sectional view of the electronic expansion valve shown;

[0021] Figure 3 is Figure 2 an enlarged schematic view of part C in;

[0022] Figure 4 is Figure 1 a perspective structural schematic diagram of some components of the electronic expansion valve shown;

[0023] Figure 5 is Figure 4 a three-dimensional exploded sectional view of;

[0024] Figure 6 is Figure 4 a perspective structural schematic diagram of a valve core sleeve shown;

[0025] Figure 7 is a perspective structural schematic diagram of a valve core sleeve of an electronic expansion valve shown according to another exemplary embodiment;

[0026] Figure 8 is a perspective structural schematic diagram of an electronic expansion valve shown according to another exemplary embodiment;

[0027] Figure 9 is a sectional view of the electronic expansion valve;

[0028] Figure 10 is a schematic structural view of a rotor assembly and a guide rod;

[0029] Figure 11 is a partial exploded view of an electronic expansion valve;

[0030] Figure 12 is a schematic structural view of a guide seat;

[0031] Figure 13 is a schematic view of the installation position of the guide seat;

[0032] Figure 14 is a schematic structural view of a first seat body;

[0033] Figure 15 is another schematic structural view of the guide seat. Specific Embodiments

[0034] Typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various variations in different embodiments, all of which do not depart from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes in essence and not for limiting the present disclosure.

[0035] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure and in which are shown, by way of example, different exemplary structures, systems, and steps that can implement various aspects of the present disclosure. It should be understood that other specific solutions of components, structures, exemplary devices, systems, and steps can be used and structural and functional modifications can be made without departing from the scope of the present disclosure. Moreover, although terms such as "above", "between", "inside", etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, for example, according to the directions of the examples shown in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present disclosure.

[0036] Refer to Figure 1 , which representatively shows a three-dimensional structural view of the electronic expansion valve proposed by the present disclosure. In this exemplary embodiment, the electronic expansion valve proposed by the present disclosure is described by taking the valve applied to a refrigeration system as an example. It is easily understood by those skilled in the art that, in order to apply the relevant designs of the present disclosure to other application scenarios, various modifications, additions, substitutions, deletions, or other changes are made to the following specific embodiments, and these changes are still within the scope of the principle of the electronic expansion valve proposed by the present disclosure.

[0037] Such as Figure 1As shown, in one embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure includes a valve seat assembly 100 and a guide seat 300. Referring in conjunction with Figures 2 to 6 , Figure 2 an axonometric sectional view of the electronic expansion valve is representatively shown; Figure 3 representatively shown in Figure 2 an enlarged schematic view of part C in Figure 4 a three-dimensional structural schematic view of some components of the electronic expansion valve is representatively shown, in which the combined structure of the valve seat assembly 100, the valve core assembly 200 and the guide seat 300 is specifically shown, and components such as the drive assembly 400 and the housing 500 are hidden; Figure 5 representatively shown in Figure 4 a three-dimensional exploded sectional view of Figure 6 a three-dimensional structural schematic view of the valve core sleeve 110 is representatively shown. The structures, connection methods and functional relationships of the main components of the electronic expansion valve proposed by the present disclosure will be described in detail below with reference to the above drawings.

[0038] As Figures 1 to 3 shown, in one embodiment of the present disclosure, the valve seat assembly 100 is provided with a valve cavity 101, and the valve cavity 101 is provided with a first valve port 1011. At least a part of the guide seat 300 is disposed in the valve cavity 101 of the valve seat assembly 100 and is fixedly connected to the valve seat assembly 100. On this basis, a positioning protrusion 1013 is provided on the first positioning surface 1012. Accordingly, the positioning protrusion 1013 presses against the guide seat 300 (such as the second positioning surface 3101), and the material hardness of the positioning protrusion 1013 is greater than the material hardness of the guide seat 300 it abuts against, so that the guide seat 300 with relatively small material hardness is deformed, thereby realizing the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. Through the above structural design, the present disclosure can use the positioning protrusion 1013 to press against the valve seat assembly 100 or the guide seat 300 to cause it to deform. Accordingly, the deformed guide seat 300 and the valve seat assembly 100 are in limit fit in the circumferential direction, avoiding relative rotation or relative displacement in the axial direction between the guide seat 300 and the valve seat assembly 100, and realizing reliable positioning of the guide seat 300.

[0039] As Figure 3 shown, in one embodiment of the present disclosure, the wall of the valve cavity 101 is provided with a first positioning surface 1012, the first positioning surface 1012 faces the guide seat 300, and the guide seat 300 has a second positioning surface 3101 facing the first positioning surface 1012. The positioning protrusion 1013 is located on one of the first positioning surface 1012 and the second positioning surface 3101, and the positioning protrusion 1013 abuts against the other.

[0040] It should be noted that in an embodiment not illustrated in the present disclosure, the material hardness of the guide seat 300 may also be greater than that of the valve seat assembly 100. On this basis, the positioning protrusion 1013 may be provided on the guide seat 300, that is, the positioning protrusion 1013 is located on the second positioning surface 3101. Accordingly, the positioning protrusion 1013 presses against the valve seat assembly 100 (for example, the first positioning surface 1012), causing the valve seat assembly 100 with relatively smaller material hardness to deform, thereby realizing the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. In other words, in various possible embodiments that conform to the design concept of the present disclosure, the positioning protrusion 1013 is provided on the one with greater material hardness among the guide seat 300 and the valve seat assembly 100, and the positioning protrusion 1013 presses against the other one (that is, the one with smaller material hardness) among the valve seat assembly 100 and the guide seat 300.

[0041] As Figure 2 shown, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure includes a valve core assembly 200. The valve core assembly 200 is disposed in the valve cavity 101 of the valve seat assembly 100. The valve core assembly 200 can move axially in the valve cavity 101, thereby realizing the opening or closing of the first valve port 1011 (specifically, it can be realized by the first valve needle of the valve core assembly 200). The valve core assembly 200 is provided with a sliding portion 250. The sliding portion 250 is in sliding fit with the guide seat 300. One end of the guide seat 300 facing away from the first valve port 1011 abuts against the end wall of the valve cavity 101 away from the first valve port 1011.

[0042] As Figure 6 shown, in an embodiment of the present disclosure, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined. On this reference plane, the orthographic projection of the positioning protrusion 1013 may be a closed ring. Through the above structural design, the present disclosure designs the positioning protrusion 1013 as a closed ring structure, thereby realizing the pressing and positioning of the guide seat 300 at various positions in the circumferential direction, and at the same time facilitating the simplification of the structural complexity when the positioning protrusion 1013 is provided on the valve seat assembly 100 and reducing the processing difficulty.

[0043] Refer to Figure 7 , Figure 7 which representatively shows a three-dimensional structural schematic diagram of the valve core sleeve 110 of the electronic expansion valve that can embody the principle of the present disclosure in another exemplary embodiment.

[0044] Different from Figure 6 the design in the embodiment shown where the positioning protrusion 1013 is a closed ring structure, as Figure 7As shown, in another embodiment of the present disclosure, the first positioning surface 1012 (or the second positioning surface 3101) may be provided with two positioning protrusions 1013. On this basis, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined. On this reference plane, the orthographic projections of these two positioning protrusions 1013 may be arranged at intervals along a closed annular path. Through the above structural design, the present disclosure adopts a plurality of discontinuous structural forms for the positioning protrusions 1013. Accordingly, the end portions of the positioning protrusions 1013 in the extending direction (such as the above-mentioned annular path, that is, the circumferential direction) can be used to further press against the guide seat 300, thereby further improving the positioning effect on the guide seat 300. In some embodiments, the first positioning surface 1012 may also be provided with three or more positioning protrusions 1013, and the orthographic projections of these positioning protrusions 1013 are arranged at intervals along a closed annular path, which is not limited to the above embodiments.

[0045] As Figure 7 shown, based on the structural design in which the first positioning surface 1012 is provided with at least two positioning protrusions 1013, in an embodiment of the present disclosure, the shapes of the positioning protrusions 1013 may be the same, and at least two positioning protrusions 1013 may be arranged evenly along the above-mentioned annular path. Through the above structural design, the present disclosure can make the positioning effects of the positioning protrusions 1013 on each position of the guide seat 300 more uniform.

[0046] In an embodiment not shown in the present disclosure, when the positioning protrusions 1013 are arranged along an annular path, the positioning protrusions 1013 arranged along one annular path may also be only one and in a non-closed shape, such as but not limited to a "C" shape, which is not limited to the above embodiments.

[0047] In an embodiment not shown in the present disclosure, the first positioning surface 1012 (or the second positioning surface 3101) may be provided with at least two positioning protrusions 1013, and at least two positioning protrusions 1013 may be arranged at intervals in the radial direction. For example, taking Figure 6 the positioning protrusions 1013 shown in a closed annular structure as an example, on this basis, the first positioning surface 1012 may be provided with two or more positioning protrusions 1013, and these positioning protrusions 1013 are arranged at intervals in the radial direction in a nested form. Another example is taking Figure 7 at least two annular protrusions shown arranged at intervals on an annular path as an example. On this basis, the first positioning surface 1012 may be provided with two or more groups of positioning protrusions 1013, and at least one group of positioning protrusions 1013 may adopt the above structural design such as Figure 7 , and the remaining groups of positioning protrusions 1013 may adopt a similar structural design, or may also adopt the above structural design such as Figure 6 . Another example is different from Figure 6 orFigure 7 In the illustrated embodiment, a structural design is adopted in which the positioning protrusions 1013 are arranged along an annular path. In other embodiments of the present disclosure, the positioning protrusions 1013 may not be arranged along an annular path (whether closed or not). On this basis, at least two positioning protrusions 1013 may be provided on the first positioning surface 1012, and the two positioning protrusions 1013 are arranged at intervals in the radial direction.

[0048] As Figure 3 shown, in an embodiment of the present disclosure, the cross-section of the positioning protrusion 1013 may be triangular. In other embodiments, the cross-section of the positioning protrusion 1013 may also be in other shapes, such as but not limited to trapezoidal, rectangular, arc-shaped, etc.

[0049] As Figures 1 to 5 shown, in an embodiment of the present disclosure, the valve seat assembly 100 may include a valve core sleeve 110 and a valve cover 120 connected axially. The valve core sleeve 110 is provided with a first cavity penetrating axially, and the valve cover 120 is provided with a second cavity penetrating axially. The first valve port 1011 is provided at one end of the valve core sleeve 110 facing away from the valve cover 120. On this basis, a part of the end face of the valve core sleeve 110 facing the valve cover 120 may form the first positioning surface 1012. Through the above structural design, the present disclosure uses the mutually assembled valve core sleeve 110 and valve cover 120 to clamp the guide seat 300, that is, a part of the end face of the valve core sleeve 110 facing the valve cover 120 is provided with the positioning protrusion 1013 to achieve the positioning function, and the other part directly participates in the fixed assembly of the guide seat 300. Accordingly, the present disclosure can machine the positioning protrusion 1013 when manufacturing the valve core sleeve 110, which is beneficial to reducing the assembly difficulty and the component processing difficulty.

[0050] As Figure 5 and Figure 6 shown, based on the structural design that the valve seat assembly 100 includes the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the positioning protrusion 1013 is provided on the valve seat assembly 100 and located on the first positioning surface 1012. One end of the valve core sleeve 110 facing the valve cover 120 may be provided with a first opening 1101, and the first opening 1101 communicates with the first cavity of the valve seat assembly 100. Accordingly, the end face of the valve core sleeve 110 facing the valve cover 120 is annular. On this basis, the positioning protrusion 1013 may be provided on the inner edge of the above end face, that is, in the radial direction, the positioning protrusion 1013 is arranged at intervals from the outer edge of the end face, thereby realizing that a part of the end face directly serves as the above-mentioned first positioning surface 1012. In other embodiments, the positioning protrusion 1013 may also be provided in the middle of the above end face, that is, in the radial direction, the positioning protrusion 1013 is arranged at intervals from both the inner edge and the outer edge of the end face, or the positioning protrusion 1013 may also be provided on the outer edge of the above end face, and all are not limited to the above embodiments.

[0051] As Figure 3 shown, based on the structural design that the positioning protrusion 1013 is arranged at the inner edge of the end face of the valve core sleeve 110, in an embodiment of the present disclosure, the chamber wall of the first chamber of the valve core sleeve 110 at its first opening 1101 can be provided with an inclined surface, and this inclined surface is connected to the side surface of the positioning protrusion 1013 (for example, if the cross section of the positioning protrusion 1013 can be triangular, trapezoidal, etc., then this side surface is also an inclined surface) to form an integrated guiding inclined surface 1102.

[0052] As Figure 3 shown, based on the structural design that the valve seat assembly 100 includes the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the chamber wall of the second chamber of the valve cover 120 can be provided with a third positioning surface 1201, and this third positioning surface 1201 faces the first positioning surface 1012 and is arranged at an axial interval, so that the valve chamber 101 forms a positioning chamber between the first positioning surface 1012 and the third positioning surface 1201. On this basis, the outer periphery of the guiding seat 300 can be provided with a positioning boss 310, at least part of this positioning boss 310 is accommodated in the positioning chamber, and the positioning boss 310 has a fourth positioning surface 3102 facing the valve cover 120, the fourth positioning surface 3102 presses against the third positioning surface 1201, and the positioning protrusion 1013 presses against the side surface of the positioning boss 310 facing the valve core sleeve 110, that is, the side surface of the positioning boss 310 facing the valve core sleeve 110 is the second positioning surface 3101.

[0053] In an embodiment of the present disclosure, the material hardness of the guiding seat 300 can be less than the material hardness of the valve core sleeve 110, and the material hardness of the guiding seat 300 can be greater than the material hardness of the sliding part 250. For example, the sliding part 250 can be a guiding nut, its material can be plastic, the material of the guiding seat 300 can be aluminum alloy or brass, and the material of the valve core sleeve 110 can be stainless steel.

[0054] Based on the structural design that the valve seat assembly 100 includes the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the guiding seat 300 can be press-fitted into the valve cover 120 (such as the second chamber) by an interference fit method. Accordingly, in a fluid hot and cold environment, the guiding seat 300 may expand and contract thermally, resulting in loosening of the connection between the guiding seat 300 and the valve cover 120. Therefore, it is necessary to increase the fixing strength of the guiding seat 300. The guiding seat 300 is pressed between the valve cover 120 and the valve core sleeve 110 and deforms, and is clamped by the valve cover 120 and the valve core sleeve 110. At the same time, the deformed guiding seat 300 is circumferentially limited with the valve core sleeve 110 to prevent the guiding seat 300 from rotating.

[0055] Refer to Figures 8 to 15 , Figure 8FIG. shows a perspective structural view of an electronic expansion valve that can embody the principles of the present disclosure in another exemplary embodiment; Figure 9 FIG. shows a cross-sectional view of the electronic expansion valve; Figure 10 FIG. shows a structural view of the rotor assembly and the guide rod; Figure 11 FIG. shows a partial exploded view of the electronic expansion valve; Figure 12 FIG. shows a structural view of the guide seat; Figure 13 FIG. shows a schematic view of the installation position of the guide seat; Figure 14 FIG. shows a structural view of the first seat body; Figure 15 FIG. shows other structural views of the guide seat.

[0056] As Figures 8 to 12 shown, the present disclosure proposes an electronic expansion valve, which includes a housing 6100, a stator assembly, a rotor assembly 6200, a lead screw 6300, a valve core assembly 6400, and a valve seat assembly 6500. The housing 6100 covers the outside of the rotor assembly 6200, part of the lead screw 6300, and part of the valve core assembly 6400 and is welded to the valve seat assembly 6500. The stator assembly is sleeved on the outside of the housing 6100, and the stator assembly can drive the rotor assembly 6200 to rotate. The valve seat assembly 6500 is provided with a valve port portion 6510, and the valve core assembly 6400 can move axially along the lead screw 6300 relative to the valve seat assembly 6500. One end of the lead screw 6300 is fixedly connected to the rotor assembly 6200, and the other end is threadedly connected to the valve core assembly 6400. The rotor assembly 6200 can drive the valve core assembly 6400 to move in a direction close to or away from the valve port portion 6510 through the lead screw 6300.

[0057] The electronic expansion valve further includes a stop ring 6600, a guide rod 6700, and a stop seat 6800. The stop seat 6800 is sleeved on the outside of the lead screw 6300 and fixedly connected to the valve seat assembly 6500. The outer circumferential side of the stop seat 6800 facing away from the lead screw 6300 is further provided with an outer guide rail portion 6810 (an external thread guide rail in this embodiment). The stop ring 6600 is sleeved on the outside of the stop seat 6800 and is movably matched with the outer guide rail portion 6810. The guide rod 6700 is fixedly connected to the rotor assembly 6200 or the lead screw 6300. The rotor assembly 6200 can drive the guide rod 6700 to push the stop ring 6600 to move spirally along the outer guide rail portion 6810.

[0058] The valve core assembly 6400 includes a sliding nut 6410, a first valve needle 6420, and a second valve needle 6430. One end of the lead screw 6300 away from the rotor assembly 6200 is in threaded cooperation with the sliding nut 6410. The lead screw 6300 can drive the sliding nut 6410 to drive the second valve needle 6430 to open or close the valve port 6510 through the first valve needle 6420. The second valve needle 6430 is provided with an adjustment passage 6431 that can communicate with the valve port 6510. The flow area of the adjustment passage 6431 is smaller than the flow area of the valve port 6510. The lead screw 6300 can drive the sliding nut 6410 to drive the first valve needle 6420 to movably cooperate with the adjustment passage 6431 to control the liquid inflow of the adjustment passage 6431.

[0059] In this way, the lead screw 6300 can be rotated along a preset direction first to drive the sliding nut 6410 to drive the first valve needle 6420 and the second valve needle 6430 to close the valve port 6510. Then, the lead screw 6300 is rotated in a direction opposite to the preset direction to drive the sliding nut 6410 to drive the first valve needle 6420 to move away from the adjustment passage 6431, so as to realize fine adjustment of the liquid inflow at the adjustment passage 6431.

[0060] In an embodiment of the present disclosure, the electronic expansion valve further includes a first elastic member 6910. One end of the first elastic member 6910 is connected to the lead screw 6300, and the other end is connected to the stop seat 6800 or the valve seat assembly 6500. The connection here includes abutment. The first elastic member 6910 is a compression elastic member, so that the lead screw 6300 and the stop seat 6800 (or the valve seat assembly 6500) can be movably cooperated along the axial direction of the lead screw 6300 through the first elastic member 6910.

[0061] When the valve core assembly 6400 moves to the position of closing the valve port 6510 and the rotor assembly 6200 continues to rotate, both the first valve needle 6420 and the second valve needle 6430 cannot continue to move closer to the valve port 6510. Since the lead screw 6300 and the valve seat assembly 6500 can be movably cooperated along the axial direction of the lead screw 6300 through the first elastic member 6910, the lead screw 6300 and the rotor assembly 6200 move away from the valve port 6510. And during the movement of the lead screw 6300, the first elastic member 6910 is compressed. Under the push of the reaction force, the first elastic member 6910 generates an elastic force on the lead screw 6300. This elastic force can drive the lead screw 6300 to drive the valve core assembly 6400 to further press the valve port 6510 to generate a pre-tightening force on the valve port 6510 and improve the sealing performance between the valve port 6510 and the second valve needle 6430.

[0062] Specifically, in an embodiment of the present disclosure, the first elastic member 6910 is a compression spring or a metal shrapnel.

[0063] In an embodiment of the present disclosure, the electronic expansion valve further includes a second elastic member 6920. One end of the second elastic member 6920 abuts against the second valve needle 6430, and the other end abuts against the valve seat assembly 6500. The second elastic member 6920 is a compression elastic member, so that the second valve needle 6430 has a tendency to move in a direction approaching the valve port 6510.

[0064] In this way, the second valve needle 6430 is continuously subjected to the driving force of the second elastic member 6920, which can prevent the second valve needle 6430 from shaking left and right, thus facilitating the centering of the first valve needle 6420 and the adjustment passage 6431.

[0065] Specifically, in an embodiment of the present disclosure, the second elastic member 6920 is a compression spring, and the second elastic member 6920 is sleeved outside a part of the second valve needle 6430 and a part of the sliding nut 6410.

[0066] In this way, it is beneficial to control the magnitude of the driving force of the second elastic member 6920 on the second valve needle 6430.

[0067] In an embodiment of the present disclosure, as Figure 9 , Figure 11 and Figure 12 shown, the electronic expansion valve further includes a guide seat 6820. The guide seat 6820 is disposed at one end of the stop seat 6800 close to the valve port 6510 and is connected to the valve seat assembly 6500, and the sliding nut 6410 is movably matched with the guide seat 6820 along a preset axial direction. The valve core assembly 6400 and the guide seat 6820 are limitedly matched along the circumferential direction around the preset axial direction. Therefore, there is no need to process a chute on the stop seat 6800 for limited matching with the valve core assembly 6400, and only a single guide seat 6820 needs to be processed, which reduces the difficulty of the design for restricting the rotation of the valve core assembly 6400.

[0068] Specifically, the guide seat 6820 is connected to the valve seat assembly 6500 by interference fit, and the top of the guide seat 6820 extends into the stop seat 6800.

[0069] It should be noted that the preset axial direction, the axial direction of the lead screw 6300, the axial direction of the stop seat 6800, the axial direction of the valve core assembly 6400, the axial direction of the rotor assembly 6200, and the axial direction of the electronic expansion valve, etc. are all in the same direction. That is, in the electronic expansion valve, components such as the lead screw 6300, the stop seat 6800, and the valve core assembly 6400 are all coaxially arranged.

[0070] Since the guide seat 6820 and the stop seat 6800 are respectively connected to the valve seat assembly 6500, and the guide seat 6820 and the stop seat 6800 are independent components, the guide seat 6820 can be independently processed, greatly reducing the processing difficulty of the guide seat 6820 and the stop seat 6800.

[0071] Specifically, in an embodiment of the present disclosure, the guiding seat 6820 is a metal part. Specifically, the guiding seat 6820 is made of aluminum alloy, stainless steel, copper alloy, etc., and will not be listed one by one here.

[0072] In this way, the wear resistance of the guiding seat 6820 axially cooperating with the sliding nut 6410 is increased, and the processing cost of the guiding seat 6820 is reduced.

[0073] Furthermore, in an embodiment of the present disclosure, as Figure 9 and Figure 11 shown, the sliding nut 6410 includes a nut body 6411 and an anti-rotation protrusion 6412. The anti-rotation protrusion 6412 is fixedly arranged on the outer peripheral side of the nut body 6411. The guiding seat 6820 is provided with a main body hole 6821 and a limiting hole 6822 communicating with the main body hole 6821. The nut body 6411 and the main body hole 6821 are movably matched along a preset axial direction, and the anti-rotation protrusion 6412 and the limiting hole 6822 are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction.

[0074] That is to say, the anti-rotation protrusion 6412 does not affect the axial movement cooperation between the sliding nut 6410 and the guiding seat 6820. However, under the limiting action of the limiting hole 6822, the anti-rotation protrusion 6412 cannot rotate around the preset axial direction, that is, the sliding nut 6410 cannot rotate relative to the guiding seat 6820.

[0075] In an embodiment of the present disclosure, both the main body hole 6821 and the limiting hole 6822 axially penetrate through the guiding seat 6820.

[0076] Specifically, the number of the anti-rotation protrusions 6412 can be one or multiple. For example, when the number of the anti-rotation protrusions 6412 is two, the two anti-rotation protrusions 6412 are arranged at opposite ends of the nut body 6411. For the convenience of processing, multiple anti-rotation protrusions 6412 are evenly spaced along the direction around the preset axial direction.

[0077] In an embodiment of the present disclosure, as Figure 9 , Figure 11 and Figure 12 shown, the guiding seat 6820 is in a cylindrical shape, the main body hole 6821 and the guiding seat 6820 are coaxially arranged, and the limiting hole 6822 axially penetrates through the side wall of the guiding seat 6820. Of course, the limiting hole 6822 may not penetrate through the side wall of the guiding seat 6820.

[0078] It should be noted that when a limiting hole 6822 radially penetrates through the side wall of the guiding seat 6820, the guiding seat 6820 is in a C shape with a notch on one side.

[0079] When the radial length of the rotation stopping protrusion 6412 along the guide seat 6820 is greater than or equal to the thickness of the side wall of the guide seat 6820, the limiting hole 6822 penetrates through the side wall of the guide seat 6820 along the radial direction of the guide seat 6820. Thus, the guide seat 6820 is separated by the limiting hole 6822. In order to improve the structural strength of the guide seat 6820, in the present embodiment, as Figure 9 , Figure 11 and Figure 12 shown, a first connecting member 6823 is fixedly sleeved on the outer peripheral side of the guide seat 6820. Specifically, the first connecting member 6823 is sleeved in the middle of the guide seat 6820, and the first connecting member 6823 and the guide seat 6820 are integrally formed.

[0080] Furthermore, when the length of the rotation stopping protrusion 6412 continues to extend, in an embodiment of the present disclosure, as Figure 9 , Figure 11 and Figure 12 shown, the first connecting member 6823 is provided with a through hole 6824 penetrating through itself along a preset axial direction, and the through hole 6824 communicates with one end of the limiting hole 6822 away from the main body hole 6821.

[0081] In an embodiment of the present disclosure, as Figure 11 and Figure 12 shown, one end of the guide seat 6820 close to the valve port portion 6510 is provided with a ring of ribs 6825, and the valve seat assembly 6500 is correspondingly provided with a clamping protrusion 6520 for the ribs 6825. The clamping protrusion 6520 can be axially clamped into the ribs 6825 along the preset axial direction to prevent the guide seat 6820 from rotating relative to the valve seat assembly 6500.

[0082] Thus, during assembly, the guide seat 6820 can be axially extruded so that the clamping protrusion 6520 is clamped into the ribs 6825, thereby preventing the guide seat 6820 from rotating relative to the valve seat assembly 6500.

[0083] Specifically, the number of the clamping protrusions 6520 can be one or more. When the number of the clamping protrusions 6520 is more than one, the plurality of clamping protrusions 6520 are arranged on the valve seat assembly 6500 along the direction around the preset axial direction.

[0084] However, it is not limited thereto. In another embodiment, the ribs 6825 can also be provided on the valve seat assembly 6500, and the guide seat 6820 is correspondingly provided with a clamping protrusion 6520 for the ribs 6825.

[0085] In an embodiment of the present disclosure, as Figure 11As shown, at one end of the valve seat assembly 6500 close to the guide seat 6820, there are relatively arranged first limit bumps 6530 and second limit bumps 6540, and the guide seat 6820 is clamped between the first limit bump 6530 and the second limit bump 6540.

[0086] In this way, the guide seat 6820 can be limited, preventing the guide seat 6820 from tilting when the rib 6825 deforms.

[0087] As Figures 13 to 15 As shown, in an embodiment of the present disclosure, in addition to the first connecting member 6823, the guide seat 6820 further has a second connecting member 1-2. Specifically, the first seat body 1-5 has a first installation groove 1-1, and the end of the second seat body 1-6 is located in the first installation groove 1-1. A second connecting member 1-2 is provided on the outermost periphery of the guide seat 6820, and the second connecting member 1-2 is clamped between the bottom wall of the first installation groove 1-1 and the end of the second seat body 1-6. The bottom wall of the first installation groove 1-1 has a through hole, and the first installation groove 1-1 makes the inner wall of the first seat body 1-5 in an L shape. The two end faces of the second connecting member 1-2 along the valve axis are respectively in contact with the first seat body 1-5 and the second seat body 1-6, and the second connecting member 1-2 is firmly clamped by the first seat body 1-5 and the second seat body 1-6, avoiding the rotation of the guide seat 6820.

[0088] There is a gap between the circumferential outer wall of the second connecting member 1-2 and the circumferential inner wall of the first installation groove 1-1, which can avoid the difficulty of installing the second connecting member 1-2 in the first seat body 1-5 due to the oversize of the dimension of the second connecting member 1-2 along the valve radius. The circumferential outer wall of the second connecting member 1-2 specifically refers to the annular side wall located between the two end faces of the second connecting member 1-2. The circumferential inner wall of the first installation groove 1-1 specifically refers to the annular inner wall along the valve axis.

[0089] The second connecting member 1-2 is located on the outer periphery of the first connecting member 6823. The first seat body 1-5 has a second installation groove 1-3, and the bottom wall of the second installation groove 1-3 has a through hole, and the second installation groove 1-3 makes the inner wall of the first seat body 1-5 in an L shape. The bottom wall of the first installation groove 1-1 is recessed away from the valve port to form the second installation groove 1-3. The circumferential outer wall of the first connecting member 6823 is fixedly connected to the circumferential inner wall of the second installation groove 1-3, which can further avoid the rotation of the guide seat 6820, where the fixed connection includes a detachable movable connection. The circumferential outer wall of the first connecting member 6823 specifically refers to the annular wall roughly along the valve axis. The circumferential inner wall of the second installation groove 1-3 specifically refers to the annular inner wall along the valve axis.

[0090] The circumferential outer wall of the first connecting member 6823 and the circumferential inner wall of the second mounting groove 1-3 can be fixedly connected by means of a threaded connection. To prevent the end of the first connecting member 6823 away from the second connecting member 1-2 from squeezing against the bottom wall of the second mounting groove 1-3 during the threaded connection process, which may cause deformation of the guide seat 6820, there is a gap between the end of the first connecting member 6823 away from the second connecting member 1-2 and the bottom wall of the second mounting groove 1-3 after the first connecting member is installed.

[0091] The specific installation process of the guide seat 6820 is as follows: threadedly connect the guide seat 6820 with the first seat body 1-5 until the second connecting member 1-2 fits against the first seat body 1-5. At this time, the installation between the guide seat 6820 and the first seat body 1-5 is in place; then, install the second seat body 1-6. Specifically, after the second seat body 1-6 fits against the side of the second connecting member 1-2 away from the first seat body 1-5, fixedly connect the second seat body 1-6 with the first seat body 1-5. At this time, the guide seat 6820 is pressed between the first seat body 1-5 and the second seat body 1-6, and the installation of the guide seat 6820 is completed.

[0092] As Figure 13 shown, the electronic expansion valve further includes a mounting seat 1-7. The interior of the mounting seat 1-7 is a mounting cavity. The second seat body 1-6 is located in the mounting cavity, and at least part of the first seat body 1-5 is located in the mounting cavity and is connected to the mounting seat 1-7. The mounting seat 1-7 has a fluid inlet and a fluid outlet. The fluid inlet is in communication with the interior of the second seat body 1-6, and the valve port portion 6510 is in communication with the fluid outlet.

[0093] As Figure 13 shown, in an embodiment of the present disclosure, the valve port portion 6510 can be made of metal. To avoid the problem of poor sealing performance between the second valve needle 6430 made of metal and the valve port portion 6510 made of metal, the second valve needle 6430 can be provided with a seal 1-4. The hardness of the seal 1-4 is less than the hardness of the valve port portion 6510. The material of the seal 1-4 can be rubber or plastic. The seal 1-4 is in sealing cooperation with the valve port portion 6510 to ensure that there is no leakage when the valve port portion 6510 is closed.

[0094] As described above, according to Figures 8 to 15 the above-described embodiment shown, the present disclosure provides an electronic expansion valve, including a valve core assembly and a valve seat assembly. The valve seat assembly is provided with a valve port portion, and the valve core assembly can open or close the valve port portion; the electronic expansion valve further includes a guide seat, which is arranged at one end of the valve seat assembly away from the valve port portion, and the valve core assembly and the guide seat are movably matched along a preset axial direction; the valve core assembly and the guide seat are limitedly matched along the circumferential direction around the preset axial direction.

[0095] In an embodiment of the present disclosure, the guide seat is connected to the valve seat assembly by interference fit.

[0096] In an embodiment of the present disclosure, a stop seat is further included, and the top of the guide seat extends into the stop seat.

[0097] In an embodiment of the present disclosure, the valve core assembly includes a sliding nut, the sliding nut includes a nut body and an anti-rotation protrusion, the anti-rotation protrusion is fixedly arranged on the outer peripheral side of the nut body, the guide seat is provided with a main body hole and a limiting hole communicating with the main body hole, the main body hole and the nut body are movably matched along a preset axial direction, and the anti-rotation protrusion and the limiting hole are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction.

[0098] In an embodiment of the present disclosure, the guide seat is in a cylindrical shape, the main body hole and the guide seat are coaxially arranged, and the limiting hole is arranged on the side wall of the guide seat along the preset axial direction.

[0099] In an embodiment of the present disclosure, a first connecting piece is fixedly sleeved on the outer peripheral side of the guide seat.

[0100] In an embodiment of the present disclosure, the first connecting piece is provided with a through hole penetrating through itself along the preset axial direction, and the through hole communicates with one end of the limiting hole far away from the main body hole.

[0101] It should be noted here that the electronic expansion valves shown in the drawings and described in this specification are only several examples of many electronic expansion valves that can adopt 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 valves shown in the drawings or described in this specification.

[0102] In summary, the electronic expansion valve proposed by the present disclosure includes a valve seat assembly 100 and a guide seat 300; the valve seat assembly 100 is provided with a valve cavity 101, and the valve cavity 101 is provided with a first valve port 1011; at least a part of the guide seat 300 is arranged in the valve cavity 101 and is fixedly connected to the valve seat assembly 100; wherein, a positioning protrusion 1013 is arranged on the one with a greater material hardness among the valve seat assembly 100 and the guide seat 300, the positioning protrusion 1013 presses against the other one, the material hardness of the positioning protrusion 1013 is greater than the material hardness of the valve seat assembly 100 or the guide seat 300 it abuts against, and the positioning protrusion 1013 is used for positioning the valve seat assembly 100 and the guide seat 300 axially and circumferentially. Through the above structural design, the present disclosure can use the positioning protrusion 1013 to press against the valve seat assembly 100 or the guide seat 300 to cause it to deform, thereby enabling the deformed guide seat 300 to be limitedly matched with the valve seat assembly 100 in the circumferential direction, avoiding relative rotation of the guide seat 300 and the valve seat assembly 100 along the circumferential direction or relative displacement along the axial direction, and realizing reliable positioning of the guide seat 300.

[0103] Exemplary embodiments of the electronic expansion valve proposed by the present disclosure have been described and / or illustrated in detail above. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from the other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with the other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an" and "the above" etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. Furthermore, the terms "first" and "second" etc. in the claims and the specification are only used as labels and are not numerical limitations on their objects.

[0104] Although the electronic expansion valve proposed by the present disclosure has been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the embodiments of the present disclosure within the spirit and scope of the claims.

Claims

1. An electronic expansion valve, characterized in that: It includes a valve seat assembly (100) and a guide seat (300); The valve seat assembly (100) is provided with a valve cavity (101), and the valve cavity (101) is provided with a first valve port (1011); At least part of the guide seat (300) is disposed in the valve cavity (101) and fixedly connected to the valve seat assembly (100); Wherein, a positioning protrusion (1013) is provided on the one with a greater material hardness among the valve seat assembly (100) and the guide seat (300), the positioning protrusion (1013) presses against the other one, and the material hardness of the positioning protrusion (1013) is greater than the material hardness of the valve seat assembly (100) or the guide seat (300) it abuts against, so as to position the valve seat assembly (100) and the guide seat (300) axially and circumferentially.

2. The electronic expansion valve according to claim 1, wherein Define a reference plane perpendicular to the axial direction and parallel to the radial direction. On the reference plane, the orthographic projection of the positioning protrusion (1013) is a closed ring.

3. The electronic expansion valve according to claim 1, wherein The cross section of the positioning protrusion (1013) is triangular, trapezoidal, rectangular or arc-shaped.

4. The electronic expansion valve according to claim 1, wherein, The cavity wall of the valve cavity (101) is provided with a first positioning surface (1012), the first positioning surface (1012) faces the guide seat (300), and the guide seat (300) has a second positioning surface (3101) facing the first positioning surface (1012); and the positioning protrusion (1013) is located on one of the first positioning surface (1012) and the second positioning surface (3101), and the positioning protrusion (1013) abuts against the other one.

5. The electronic expansion valve according to claim 4, characterized in that, At least two of the positioning protrusions (1013) are provided on the first positioning surface (1012) or the second positioning surface (3101); wherein, define a reference plane perpendicular to the axial direction and parallel to the radial direction. On the reference plane, the orthographic projections of at least two of the positioning protrusions (1013) are arranged at intervals along a closed ring path.

6. The electronic expansion valve according to claim 5, characterized in that, The shapes of the positioning protrusions (1013) are the same and are arranged uniformly along the ring path.

7. The electronic expansion valve according to claim 4, characterized in that At least two of the positioning protrusions (1013) are provided on the first positioning surface (1012) or the second positioning surface (3101), and at least two of the positioning protrusions (1013) are arranged at intervals in the radial direction.

8. The electronic expansion valve according to any one of claims 4 to 7, characterized in that, The valve seat assembly (100) includes a valve core sleeve (110) and a valve cover (120) connected axially. The valve core sleeve (110) is provided with a first cavity penetrating axially, the valve cover (120) is provided with a second cavity penetrating axially, and the first valve port (1011) is provided at one end of the valve core sleeve (110) facing away from the valve cover (120); wherein, an end face portion of the valve core sleeve (110) facing the valve cover (120) forms the first positioning surface (1012).

9. The electronic expansion valve according to claim 8, wherein The positioning projection (1013) is arranged on the first positioning surface (1012). One end of the valve core sleeve (110) facing the valve cover (120) is provided with a first opening (1101), and the first opening (1101) communicates with the first cavity, so that the end surface of the valve core sleeve (110) facing the valve cover (120) is annular; wherein, the positioning projection (1013) is arranged on the inner edge of the end surface.

10. The electronic expansion valve according to claim 9, characterized in that, The cavity wall of the first cavity at the first opening (1101) is provided with an inclined surface, and the inclined surface and the side surface of the positioning projection (1013) are connected as an integral guiding inclined surface (1102).

11. The electronic expansion valve according to claim 8, characterized in that, The cavity wall of the second cavity is provided with a third positioning surface (1201), and the third positioning surface (1201) faces the first positioning surface (1012) and is arranged at intervals in the axial direction, so that a positioning chamber is formed in the valve cavity (101) between the first positioning surface (1012) and the third positioning surface (1201); a positioning boss (310) is arranged on the outer periphery of the guiding seat (300), at least part of the positioning boss (310) is accommodated in the positioning chamber, and the positioning boss (310) has a fourth positioning surface (3102) facing the valve cover (120), and the fourth positioning surface (3102) presses against the third positioning surface (1201).

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