Tool, method for assembling an electronic expansion valve, and electronic expansion valve

Abstract

This invention discloses a tooling, an assembly method for an electronic expansion valve, and the electronic expansion valve itself. The tooling includes: a guide seat with a through hole, the through hole having three segments, an upward-facing first stepped surface, and a downward-facing second stepped surface; the inner diameter of the first segment is adapted to the outer diameter of the first rod segment of a lead screw, and the inner diameter of the second segment is adapted to the outer diameter of the second rod segment of the lead screw; the length of the first segment is less than the length of the first rod segment; a tooling nut with an internal thread portion, the internal thread portion having a first tooth at the tip, the tooling nut being fixedly embedded in the third segment, and the tip of the tooling nut abutting against the second stepped surface; the internal thread portion being used for threaded connection with the external thread structure; and a marking structure for determining the relative position of the limiting boss and the first tooth at the tip in the circumferential direction when assembling the rotor component and the lead screw. The structural design of the tooling provides assurance for zero-position control of the electronic expansion valve and facilitates automated assembly of the electronic expansion valve.

Description

Technical Field

[0001] This invention relates to the field of valve assembly technology, and in particular to a tooling, an assembly method for an electronic expansion valve, and the electronic expansion valve itself. Background Technology

[0002] The operating principle of a direct-acting electronic expansion valve is as follows: the coil drives the rotor to rotate circumferentially, and the lead screw, which is fixed relative to the rotor, rotates accordingly. The lead screw and the nut, which is fixed relative to the valve body, are threaded together. Under the action of the threaded transmission, the lead screw also moves axially along the valve body to drive the valve needle to move closer to or away from the valve port, so as to realize the flow regulation of the refrigerant.

[0003] To ensure the consistency of the flow rate of the electronic expansion valve, it is necessary to reset it to zero. The zero position is generally determined by the limit of the mechanical structure. Specifically, there is a limit boss on the nut and a limit boss on the rotor fixed to the lead screw. The thread fit length between the lead screw and the nut is limited by the contact of the two limit bosses. The position where the two limit bosses contact is the flow control reference of the electronic expansion valve, that is, the aforementioned zero position.

[0004] At the zero position, the two limiting bosses need to have a certain mating length to ensure strength. This mating length also affects the valve opening stroke. Zero position control is generally achieved through assembly. Currently, there is no good assembly method that can achieve automated assembly while ensuring zero position control of the electronic expansion valve. Summary of the Invention

[0005] The purpose of this invention is to provide a tooling, an assembly method for an electronic expansion valve, and an electronic expansion valve. The tooling is used for assembling the electronic expansion valve. The structural design of the tooling can ensure the zero-position control of the electronic expansion valve and facilitate the automated assembly of the electronic expansion valve.

[0006] To solve the above-mentioned technical problems, the present invention provides a tooling for assembling an electronic expansion valve. The electronic expansion valve includes a lead screw and a rotor assembly, the lead screw and the rotor assembly being fixedly connected. The lower end of the rotor assembly has a downwardly extending limiting boss. The lead screw includes a first rod segment and a second rod segment. The connection between the first rod segment and the second rod segment has a downward-facing shoulder surface, and the second rod segment has an external thread structure.

[0007] The tooling includes:

[0008] A guide seat has a through hole, which has a first hole segment, a second hole segment, and a third hole segment. The connection between the first hole segment and the second hole segment has an upward-facing first stepped surface, and the connection between the second hole segment and the third hole segment has a downward-facing second stepped surface. The inner diameter of the first hole segment is adapted to the outer diameter of the first rod segment, and the inner diameter of the second hole segment is adapted to the outer diameter of the second rod segment. The length of the first hole segment is less than the length of the first rod segment.

[0009] A tool nut has an internal thread portion with a first tooth at the top. The tool nut is fixedly embedded in the third hole section, and the top of the tool nut abuts against the second stepped surface. The internal thread portion is used for threaded connection with the external thread structure.

[0010] The marking structure is used to determine the relative position of the limiting boss and the top first tooth in the circumferential direction when assembling the rotor component and the lead screw.

[0011] The present invention also provides a method for assembling an electronic expansion valve, comprising assembling a rotor assembly and a lead screw, wherein the rotor assembly and the lead screw are assembled using the tooling described in any one of the above claims, comprising:

[0012] Insert the lead screw into the through hole of the guide seat, rotate the lead screw to engage with the tool nut, until the shoulder surface of the lead screw abuts against the first step surface, and the upper section of the lead screw extends out of the guide seat;

[0013] The rotor component is fitted onto the lead screw, and the marking structure is used to determine the relative position of the limiting boss of the rotor component and the top first tooth in the circumferential direction. Then the rotor component is pressed into place until it fits against the upper end face of the guide seat.

[0014] Fix the rotor component and the lead screw, and then unscrew the assembled rotor component and lead screw from the guide seat.

[0015] The present invention also provides an electronic expansion valve, wherein the electronic expansion valve is an electronic expansion valve assembled using the above-described assembly method.

[0016] The tooling provided by this invention is used for assembling electronic expansion valves. The tooling is used to assemble the rotor component and lead screw of the electronic expansion valve. The structural design of the tooling can determine the relative position of the first tooth of the tooling nut and the limiting boss of the rotor component in the circumferential direction during assembly, thus ensuring the zero-position control of the electronic expansion valve.

[0017] The assembly method of the electronic expansion valve provided by the present invention uses the above-mentioned tooling, which is conducive to realizing the automation of electronic expansion valve assembly. The electronic expansion valve obtained by this assembly method is conducive to ensuring the consistency of the zero position. Attached Figure Description

[0018] Figure 1 A partial cross-sectional schematic diagram of an electronic expansion valve provided in an embodiment of the present invention;

[0019] Figure 2 A cross-sectional schematic diagram of an electronic expansion valve provided in an embodiment of the present invention;

[0020] Figure 3 for Figure 1 Cross-sectional schematic diagram of the middle nut component;

[0021] Figure 4 for Figure 1 A cross-sectional view of the assembled rotor assembly and lead screw;

[0022] Figure 5 This is a schematic diagram of the first process of assembling the rotor component and the lead screw using the tooling of the first embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the second process of assembling the rotor component and the lead screw using the tooling of the first embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the third process of assembling the rotor component and the lead screw using the tooling of the first embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the fourth process of assembling the rotor component and the lead screw using the tooling of the first embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the tooling structure according to the second embodiment of the present invention;

[0027] Figure 10 This is a partial structural diagram of the tooling provided in the third embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the structure of the carrier of the tooling according to the third embodiment of the present invention;

[0029] Figure 12 for Figure 11 Top view of the carrier shown;

[0030] Figure 13 This is a partial structural diagram of the tooling according to the fourth embodiment of the present invention;

[0031] Figure 14 To and Figure 13 A cross-sectional schematic diagram of the rotor component of the electronic expansion valve corresponding to the tooling shown.

[0032] Explanation of reference numerals in the attached figures:

[0033] Valve body 11, valve port 111, nut assembly 12, internal thread structure 121, upper first tooth 1211, limiting protrusion 122, rotor assembly 13, magnet 131, limiting boss 1311, insert 132, lead screw 14, first rod section 141, second rod section 142, shaft shoulder surface 143, external thread structure 144, lower first tooth 1441, valve needle 15;

[0034] Guide seat 20, through hole 21, first hole section 211, second hole section 212, third hole section 213, first step surface 214, second step surface 215, first seat part 201, second seat part 202, insertion hole 221;

[0035] Tool nut 30, internal thread 31, top first tooth 311;

[0036] Top rod 40, handle 41, elastic element 42;

[0037] Base 50;

[0038] Carrier 60, limiting groove 61, groove end face 611, vision sensor 70;

[0039] Identification marker A1, first identification structure B1, second identification structure B2. Detailed Implementation

[0040] Please refer to Figures 1 to 4 , Figure 1 and Figure 2 Cross-sectional views of the electronic expansion valve at different locations are shown. Figure 3 and Figure 4 These are cross-sectional views of the nut component and rotor assembly of the electronic expansion valve, respectively. The rotor assembly here includes the rotor component and the lead screw.

[0041] The electronic expansion valve includes a valve body 11, a nut component 12, a rotor component 13, a lead screw 14, and a valve needle 15. The nut component 12 is fixedly connected to the valve body 11. The rotor component 13 includes a magnet 131 and an insert 132. The rotor component 13 is fixedly connected to the lead screw 14 through its insert 132. Specifically, the insert 132 is fixedly sleeved on the lead screw 14. The lead screw 14 is connected to the valve needle 15 and is threadedly connected to the nut component 12.

[0042] During operation, the rotor component 13 is driven to rotate circumferentially by the coil (not shown in the figure), which in turn drives the lead screw 14 to rotate. Under the action of the threaded connection between the lead screw 14 and the nut component 12, the lead screw 14 drives the valve needle 15 to move closer to or away from the valve port 111 along the axial direction of the valve body 11, so as to realize the flow regulation of the refrigerant.

[0043] It is understandable that, since the lead screw 14 and the rotor component 13 are fixed, the rotor component 13 moves together with the lead screw 14 when moving axially. When both move axially downward (towards the valve port 111) to the lower limit, the valve needle 15 is in the state of closing the valve port 111. This position is also called the zero position. To ensure the flow consistency of the electronic expansion valve, this zero position control is crucial. Currently, this zero position is ensured by a limiting structure. Specifically, a limiting protrusion 122 is provided on the nut component 12, and a limiting boss 1311 is provided on the lower end face of the magnet 131 of the rotor component 13. The limiting boss 1311 protrudes downward from the lower end face of the magnet 131. When the rotor component 13 and the lead screw 14 move axially downward until the limiting boss 1311 and the limiting protrusion 122 abut circumferentially, the rotor component 13 and the lead screw 14 cannot continue to move downward, thereby achieving zero position control.

[0044] like Figure 1 As shown, the overlap length L of the limiting boss 1311 and the limiting protrusion 122 affects the strength of the two bosses at the zero position and also affects the precise control of the zero position. Therefore, in practice, for precise zero position control, it is necessary to ensure the overlap length L of the limiting boss 1311 and the limiting protrusion 122.

[0045] Combination Figure 2 It is understandable that the overlap length L of the limiting boss 1311 and the limiting protrusion 122 is related to the threaded length of the nut component 12 and the lead screw 14. Specifically, the nut component 12 has an internal thread structure 121, and the lead screw 14 has an external thread structure 144. The external thread structure 144 is threadedly engaged with the internal thread structure 121. The overlap length L of the limiting boss 1311 and the limiting protrusion 122 can be controlled by the relative position of the upper first tooth 1211 of the internal thread structure 121 and the limiting protrusion 122, and the relative position of the lower first tooth 1441 of the external thread structure 144 and the limiting boss 1311. The nut 12 is generally an injection molded part, and the relative position of its upper first tooth 1211 and the limiting protrusion 122 can be ensured by the injection mold.

[0046] The lead screw 14 and rotor assembly 13 of the electronic expansion valve are two relatively independent components. The relative position of the lower end first tooth 1441 and the limiting boss 1311 of the lead screw 14 needs to be controlled by assembly. The tooling provided in this paper is used for the assembly of the electronic expansion valve. Specifically, it is used for the assembly of the lead screw 14 and rotor assembly 13 of the electronic expansion valve, so as to control the relative position of the lower end first tooth 1441 and the limiting boss 1311 by assembly, and provide conditions for precise control of the zero position.

[0047] like Figure 4As shown, the lead screw 14 includes a first rod segment 141 and a second rod segment 142. The radial dimension of the first rod segment 141 is larger than that of the second rod segment 142. The connection between the two has a downward-facing shoulder surface 143. An external thread structure 144 is provided on the second rod segment 142. The lead screw 14 is specifically fixedly engaged with the insert 132 of the rotor component 13 through the first rod segment 141.

[0048] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Please refer to this as well. Figures 5 to 8 , Figures 5 to 8 A process diagram showing the assembly of the rotor assembly and the lead screw using the tooling of the first embodiment is shown.

[0050] The tooling provided in this embodiment is used for assembling an electronic expansion valve. The tooling includes a guide seat 20 and a tooling nut 30. The guide seat 20 has a through hole 21, which has a first hole segment 211, a second hole segment 212 and a third hole segment 213. The connection between the first hole segment 211 and the second hole segment 212 has an upward-facing first step surface 214, and the connection between the second hole segment 212 and the third hole segment 213 has a downward-facing second step surface 215. Obviously, the diameter of the second hole segment 212 is smaller than the diameter of the first hole segment 211 and also smaller than the diameter of the third hole segment 213. The first hole segment 211 is located above the second hole segment 212, and the third hole segment 213 is located below the second hole segment 212.

[0051] The inner diameter of the first hole section 211 is adapted to the outer diameter of the first rod section 141 of the lead screw 14, the inner diameter of the second hole section 212 is adapted to the outer diameter of the second rod section 142 of the lead screw 14, and the length of the first hole section 211 is less than the length of the first rod section 141 of the lead screw 14.

[0052] The tool nut 30 is fixedly embedded in the third hole section 213 of the guide seat 20, and its top end abuts against the second step surface 215. The tool nut 30 has an internal thread portion 31 for threaded connection with the external thread structure 144 of the lead screw 14. Obviously, after the tool nut 30 is assembled with the guide seat 20, the inner diameter of the tool nut 30 is equivalent to the inner diameter of the second hole section 212.

[0053] As set up above, the lead screw 14 can be inserted into the through hole 21 of the guide seat 20 and screwed into the tool nut 30.

[0054] The tooling also includes a marking structure for determining the relative position in the circumferential direction of the limiting boss 1311 and the top first tooth 311 of the internal thread portion 31 when assembling the rotor component 13 and the lead screw 14. Here, the circumferential direction can be understood as the circumferential direction of the through hole 21 of the guide seat 20 or the circumferential direction of the lead screw 14 after it has been assembled with the guide seat 20.

[0055] When assembling the tool guide seat 20 and the tool nut 30, it is necessary to determine the relative position of the top first tooth 311 of the tool nut 30 and the marking structure, so as to provide a basis for the circumferential position of the limiting boss 1311 when assembling the lead screw 14 and the rotor component 13 later.

[0056] Specifically, the relative position of the top first tooth 311 of the tooling nut 30 and the marking structure is determined based on the direction of the top first tooth 1211 of the nut 12 of the actual electronic expansion valve. It can be understood that the tooling nut 30 actually simulates the position of the nut 12. Therefore, after determining the position of the top first tooth 311 of the tooling nut 30, and assembling the lead screw 14 and rotor assembly 13 on the tooling, the relative positions of the lead screw 14, rotor assembly 13, and nut 12 after assembly are also determined, thus determining the zero-point position.

[0057] In this embodiment, the tooling marking structure includes a push rod 40, which is circumferentially limited to the guide seat 20. That is, the push rod 40 and the top first tooth 311 of the tooling nut 30 have a predetermined relative position in the circumferential direction. Furthermore, the push rod 40 can move relative to the guide seat 20 in the axial direction, where the axial direction can be understood as the length direction of the through hole 21 of the guide seat 20. The push rod 40 is used to abut against the limiting boss 1311 of the rotor component 13 in the circumferential direction.

[0058] After the lead screw 14 is engaged with the tooling, when assembling the rotor component 13 onto the lead screw 14, the assembly direction of the rotor component 13 is determined by the circumferential contact between the push rod 40 and the limiting boss 1311. That is, the circumferential position of the limiting boss 1311 is determined. To ensure that the push rod can abut against the limiting boss 1311 circumferentially, the axial insertion direction of the rotor component 13 will inevitably interfere with the push rod 40. Setting the push rod 40 to slide axially relative to the guide seat 20 solves this problem. In other words, during assembly, the limiting boss 1311 of the rotor component 13 abuts against the push rod 40 circumferentially, and the rotor component 13 presses the push rod 40 downward axially.

[0059] Specifically, the guide seat 20 includes a first seat portion 201 and a second seat portion 202. The first seat portion 201 is located above the second seat portion 202, and the radial dimension of the first seat portion 201 is smaller than the radial dimension of the second seat portion 202, and also smaller than the inner diameter of the rotor component 13, to facilitate the assembly of the rotor component 13 with the lead screw 14. The second seat portion 202 has an insertion hole 221, the extension direction of which is parallel to the axial direction of the through hole 21, and the push rod 40 is slidably inserted into the insertion hole 221. The structural design of this guide seat 20 facilitates both the assembly of the lead screw 14 and the rotor component 13 and the connection with the push rod 40.

[0060] Furthermore, the bottom of the push rod 40 is provided with an elastic element 42. When the elastic element 42 is in its natural state, the push rod 40 extends out of the top surface of the second seat 202. The elastic element 42 facilitates the reset of the push rod 40 after the rotor component 13 and the lead screw 14 are removed after assembly. The elastic element 42 can be specifically a spring.

[0061] Specifically, the push rod 40 can also be fixed with a handle 42, which extends out of the second seat 202. The handle 42 is designed to facilitate manual control of the position of the push rod 40.

[0062] Specifically, to facilitate the installation of the elastic element 42 and related components, the tooling can also be equipped with a base 50, with the guide seat 20 embedded in the base 50. The insertion hole 221 of the guide seat 20 penetrates its bottom wall. One end of the elastic element 42 abuts against the base 50, and the other end abuts against the top rod 40. The base 50 can serve as a support for the elastic element 42, and at the same time integrates the guide seat 20, tooling nut 30, and top rod 40 together for easy management.

[0063] The assembly method for assembling the rotor component 13 and the lead screw 14 of the electronic expansion valve using this tooling includes the following steps:

[0064] like Figure 5 As shown, insert the lead screw 14 into the through hole 21 of the guide seat 20, rotate the lead screw 14 so that the lead screw 14 engages with the tool nut 30 in the guide seat 20 until the shoulder surface 143 of the lead screw 14 abuts against the first step surface 214 of the guide seat 20. At this time, the upper section of the lead screw 14 extends out of the guide seat 20.

[0065] To reiterate, before assembly, the relative positions of the top first tooth 311 of the tooling nut 30 and the push rod 40 in the circumferential direction have been determined according to the electronic expansion valve to be assembled.

[0066] After the relative positions of the lead screw 14 and the tooling are determined, as follows: Figure 6 As shown, the rotor component 13 is assembled. Specifically, the insert 132 of the rotor component 13 is fixed to the magnet 131. The magnet 131 of the rotor component 13 is fitted onto the first seat 201 of the guide seat 20, and the insert 132 is fitted onto the outer circle of the upper section of the lead screw 14. The rotor component 13 is rotated so that its limiting boss 1311 abuts against the top rod 40 in the circumferential direction. Depending on the length of the limiting boss 1311 extending from the lower end face of the rotor component 13 and the height of the top rod 40, the lower end face of the rotor component 13 may contact the top of the top rod 40, or there may be a certain gap.

[0067] After adjusting the circumferential position of rotor component 13, as follows: Figure 7As shown, the rotor component 13 is press-fitted so that the lower end face of its magnet 131 is in contact with the upper end face of the guide seat 20 to determine the relative position of the rotor component 13 and the lead screw 14 in the axial direction. During this process, the rotor component 13 presses against the top rod 40 and moves downward, and the elastic element 42 is compressed.

[0068] After determining the relative positions (including axial and circumferential) of the rotor assembly 13 and the lead screw 14, the insert 132 and the lead screw 14 are fixed, for example, by welding or by using an interference fit. Thus, the rotor assembly 13 and the lead screw 14 are assembled. Then, as... Figure 8 As shown, the assembled rotor component 13 and lead screw 14 can be unscrewed from the guide seat 20.

[0069] It is understood that the upper end face of the guide seat 20 is used to define the press-fit position of the rotor component 13 during assembly, that is, to define the relative position of the rotor component 13 and the lead screw 14 in the axial direction. This position is also related to the length of the lead screw 14 extending out of the guide seat 20, specifically related to the length of the first rod section 141 of the lead screw 14 and the length of the first hole section 211 of the guide seat 20, which can be set according to actual needs.

[0070] It should be noted that when unscrewing the rotor component 13 and the lead screw 14, the position of the push rod 40 can be controlled by pressing the handle 41 to avoid the push rod 40 interfering with the unscrewing of the rotor component 13 and the lead screw 14. After the rotor component 13 and the lead screw 14 are completely removed from the fixture, the control of the handle 41 can be canceled, and the push rod 40 will be reset under the action of the elastic element 42.

[0071] In addition to the top rod 40 form mentioned above, the tooling marking structure can also be in other forms.

[0072] Please refer to Figure 9 , Figure 9 A schematic diagram of the tooling structure of the second embodiment is shown.

[0073] To clearly illustrate the differences and connections between this solution and the first embodiment, the same functional components or structures in the figures are indicated by the same labels.

[0074] The tooling in this embodiment also includes a guide seat 20 and a tooling nut 30. The structure and mating relationship between the two are similar to those in the first embodiment described above, and will not be repeated here.

[0075] Compared with the first embodiment, the tooling in this embodiment does not have a base, a push rod, or a structure related to the push rod. The identification structure includes an identification mark A1 on the guide seat 20. The identification mark A1 and the top first tooth 311 of the tooling nut 30 have a set relative position in the circumferential direction. Similarly, the set relative position is determined according to the direction of the upper first tooth 1211 of the nut 12 of the electronic expansion valve.

[0076] Based on this, the tooling includes a vision sensor 70. During assembly, the rotor component 13 and the lead screw 14 use the vision sensor 70 to identify the relative positions of the limiting boss 1311 and the identification mark A1 in the circumferential direction to determine the assembly direction of the rotor component 13 (i.e., the position of the limiting boss 1311 in the circumferential direction during assembly).

[0077] In this way, the identification mark A1 of the guide seat 20 can be set in various ways, as long as it can be recognized by the vision sensor 70. In the figure, the identification mark A1 is in the form of a through hole. In actual application, it can be a blind hole structure or a boss, etc.

[0078] It should be noted that during assembly, since the visual sensor 70 is used to identify the identification mark A1 and the limiting boss 1311, the circumferential position of the identification mark A1 is not necessarily set to the circumferential position of the limiting boss 1311. In other words, the position of the identification mark A1 is not necessarily the position of the limiting boss 1311 during assembly.

[0079] Specifically, the relative circumferential positions of the identification mark A1 and the top first tooth 311 of the tool nut 30 are determined. During assembly, the relative circumferential positions of the limiting boss 1311 and the top first tooth 311 can be determined in advance. Therefore, the relative circumferential positions of the identification mark A1 and the limiting boss 1311 can be obtained through conversion. During assembly, ensuring the circumferential positions of the identification mark A and the limiting boss 1311 determines the circumferential positions of the limiting boss 1311 and the top first tooth 311.

[0080] However, it is understandable that if the position of the identification mark A1 is the same as the position of the limit boss 1311 during assembly, the conversion of relative position can be eliminated, the control accuracy is relatively high, and it is also convenient to operate. The vision sensor 70 only needs to ensure that the position of the limit boss 1311 corresponds to the position of the identification mark A1 during assembly.

[0081] It should be noted that, since the tooling in this scheme does not have a push rod or its related structure, the rotor component 13 and the lead screw 14 will not be interfered with after assembly.

[0082] It should also be noted that, without hindering the setting of the identification mark A1, in this scheme, the guide seat 20 does not have to be set as two parts with different outer diameters, but can be a structure with equal outer diameters.

[0083] The design of this tooling facilitates the automated assembly of electronic expansion valves, thereby improving assembly efficiency. The method for assembling the electronic expansion valve using this tooling is similar to that described in the first embodiment above, and can be understood by reference; it will not be repeated here.

[0084] Please refer to Figures 10 to 12 , Figure 10This is a partial structural diagram of the tooling provided in the third embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the carrier of the tooling according to the third embodiment of the present invention; Figure 12 for Figure 11 The top view of the carrier shown.

[0085] To clearly illustrate the differences and connections between this solution and the first embodiment, the same functional components or structures in the figures are indicated by the same labels.

[0086] The tooling in this embodiment also includes a guide seat 20 and a tooling nut 30. The structure and mating relationship between the two are similar to those in the first embodiment described above, and will not be repeated here.

[0087] Unlike the first embodiment, the tooling in this embodiment does not include a base, a push rod, or a structure related to the push rod. The tooling in this embodiment also includes a carrier 60, which is used to place the rotor component 13. The carrier 60 has a limiting groove 61 that matches the limiting boss 1311 of the rotor component 13. After the rotor component 13 is placed on the carrier 60, its limiting boss is inserted into the limiting groove 61.

[0088] In practical applications, the carrier 60 and the guide seat 20 have a fixed relative position, and the axis of the carrier 60 is parallel to the axis of the guide seat 20. The marking structure includes a limiting groove 61.

[0089] The relative position between the carrier 60 and the guide seat 20 is used to define the relative position between the limiting groove 61 and the guide seat 20, thereby defining the relative position between the limiting groove 61 and the top first tooth 311 of the internal thread structure 31 of the tool nut 30. Specifically, the position is determined by the groove end face 611 of the limiting groove 61.

[0090] During assembly, the rotor component 13 is removed from the carrier 60 without changing its circumferential orientation, and then assembled with the lead screw 14 mounted on the guide seat 20 and the tooling nut 30. This defines the circumferential position of the limiting boss 1311 and the top first tooth 311 of the rotor component 13.

[0091] Compared with the two schemes mentioned above, this scheme sets the marking structure and the top first tooth 311 on two relatively independent components. The assembly direction of the rotor component 13 during assembly is achieved by the relative positions of these two relatively independent components, namely the guide seat 20 and the carrier 60.

[0092] It is understandable that, since the marking structure is not located on the guide seat 20, in this solution, the guide seat 20 may not have a first seat portion 201 and a second seat portion 202 with different radial dimensions, and it may have a structure with the same outer diameter.

[0093] Please refer to Figure 13 and Figure 14, Figure 13 This is a partial structural diagram of the tooling according to the fourth embodiment of the present invention; Figure 14 To and Figure 13 A cross-sectional schematic diagram of the rotor component of the electronic expansion valve corresponding to the tooling shown.

[0094] To clearly illustrate the differences and connections between this solution and the first embodiment, the same functional components or structures in the figures are indicated by the same labels.

[0095] The tooling in this embodiment also includes a guide seat 20 and a tooling nut 30. The structure and mating relationship between the two are similar to those in the first embodiment described above, and will not be repeated here.

[0096] Unlike the first embodiment, the tooling in this embodiment does not include a base, a push rod, or any structures related to the push rod. In this embodiment, the marking structure includes a first identification structure B1 and a second identification structure B2, wherein the first identification structure B1 is disposed on the guide seat 20, and the second identification structure B2 is disposed on the rotor component 13. During assembly, the insertion direction of the rotor component 13 is determined by the relative position of the first identification structure B1 and the second identification structure B2.

[0097] Based on this, the tooling also includes a vision sensor, which is used during assembly to determine the relative circumferential positions of the first identification structure B1 and the second identification structure B2. Specifically, the first identification structure B1 of the guide seat 20 has a defined relative circumferential position with the top first tooth 311 of the tooling nut 30, and the second identification structure B2 and the limiting boss 1311 on the rotor component 13 also have defined relative circumferential positions. By conversion, the required relative circumferential positions of the first identification structure B1 and the second identification structure B2 can be obtained, thereby determining the assembly direction of the rotor component 13.

[0098] In the figure, the first identification structure B1 is still shown as a through hole formed in the guide seat 20. In actual application, the specific form of the first identification structure B1 can be diversified, such as a blind hole or a boss.

[0099] In the figure, the second identification structure B2 is shown as a blind hole formed on the top surface of the magnet 131. In actual applications, the second identification structure B2 can also be in other forms, such as a boss, or it can have a structure with multiple blind holes.

[0100] In this scheme, without affecting the setting of the first identification structure B1, the guide seat 20 can also be set to a structure with the same outer diameter.

[0101] The tooling designs of the aforementioned third and fourth embodiments are also conducive to the automated operation of electronic expansion valve assembly. Their assembly methods are similar to those of the first embodiment and can be understood by reference, without further explanation.

[0102] In addition to the tooling and assembly methods described above, this invention also provides an electronic expansion valve, the structure of which is as described above. Figures 1 to 4 As shown, the electronic expansion valve is specifically an electronic expansion valve obtained by the aforementioned assembly method, which can better control the zero-position reference and has good flow consistency.

[0103] The tooling, assembly method of electronic expansion valve, and electronic expansion valve provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. Tooling for assembling electronic expansion valves, characterized in that, The electronic expansion valve includes a lead screw and a rotor assembly, which are fixedly connected. The lower end of the rotor assembly has a downwardly extending limiting boss. The lead screw includes a first rod segment and a second rod segment. The connection between the first rod segment and the second rod segment has a downward-facing shoulder surface, and the second rod segment has an external thread structure. The tooling includes: A guide seat has a through hole, which has a first hole segment, a second hole segment, and a third hole segment. The connection between the first hole segment and the second hole segment has an upward-facing first stepped surface, and the connection between the second hole segment and the third hole segment has a downward-facing second stepped surface. The inner diameter of the first hole segment is adapted to the outer diameter of the first rod segment, and the inner diameter of the second hole segment is adapted to the outer diameter of the second rod segment. The length of the first hole segment is less than the length of the first rod segment. A tool nut has an internal thread portion with a first tooth at the top. The tool nut is fixedly embedded in the third hole section, and the top of the tool nut abuts against the second stepped surface. The internal thread portion is used for threaded connection with the external thread structure. The marking structure is used to determine the relative position of the limiting boss and the top first tooth in the circumferential direction when assembling the rotor component and the lead screw.

2. The tooling according to claim 1, characterized in that, The marking structure includes a top rod, which is circumferentially limited to the guide seat, and the top rod is axially movable relative to the guide seat. The top rod is used to abut against the limiting boss in the circumferential direction.

3. The tooling according to claim 2, characterized in that, The guide seat includes a first seat portion and a second seat portion. The first seat portion is located above the second seat portion, and the radial dimension of the first seat portion is smaller than the radial dimension of the second seat portion. The radial dimension of the first seat portion is also smaller than the inner diameter of the rotor component. The second seat portion has an insertion hole, the extension direction of which is parallel to the axial direction of the through hole, and the push rod is slidably inserted into the insertion hole.

4. The tooling according to claim 3, characterized in that, The bottom of the push rod is provided with an elastic element. When the elastic element is in its natural state, the push rod extends out of the top surface of the second seat.

5. The tooling according to claim 4, characterized in that, The tooling includes a handle, which is fixedly connected to the top rod and extends beyond the second seat.

6. The tooling according to claim 4, characterized in that, The tooling includes a base, a guide seat is embedded in the base, the insertion hole penetrates the bottom wall of the guide seat, one end of the elastic member abuts against the base, and the other end abuts against the top rod.

7. The tooling according to claim 1, characterized in that, The marking structure includes an identification mark disposed on the guide seat, the identification mark having a predetermined relative position with the top first tooth in the circumferential direction, and the tooling including a vision sensor for determining the relative position of the limiting boss and the identification mark in the circumferential direction when assembling the rotor component.

8. The tooling according to claim 1, characterized in that, The tooling includes a carrier for placing the rotor component. The carrier has a limiting groove that matches the limiting boss. The carrier and the guide seat have a fixed relative position, and the axis of the carrier is parallel to the axis of the guide seat. The marking structure includes the limiting groove.

9. The tooling according to claim 1, characterized in that, The identification structure includes a first identification structure and a second identification structure, one of which is disposed on the rotor component and the other is disposed on the guide seat.

10. The tooling according to claim 9, characterized in that, The tooling includes a vision sensor used to determine the relative positions of the first identification structure and the second identification structure in the circumferential direction when assembling the rotor component.

11. A method for assembling an electronic expansion valve, comprising assembling a rotor assembly and a lead screw, characterized in that, The rotor assembly and the lead screw are assembled using the tooling described in any one of claims 1-10, including: Insert the lead screw into the through hole of the guide seat, rotate the lead screw to engage with the tool nut, until the shoulder surface of the lead screw abuts against the first step surface, and the upper section of the lead screw extends out of the guide seat; The rotor component is fitted onto the lead screw, and the marking structure is used to determine the relative position of the limiting boss of the rotor component and the top first tooth in the circumferential direction. Then the rotor component is pressed into place until it fits against the upper end face of the guide seat. Fix the rotor component and the lead screw, and then unscrew the assembled rotor component and lead screw from the guide seat.

12. An electronic expansion valve, characterized in that, The electronic expansion valve is an electronic expansion valve assembled using the assembly method described in claim 11.

Images