Stop structure of electronic expansion valve

Abstract

The invention discloses an electronic expansion valve stop structure, and relates to the technical field of expansion valves, the electronic expansion valve stop structure comprises a rotor insert, the middle of the rotor insert is fixedly sleeved with a screw, the rotor insert is located at the top of the screw, the outer wall of the screw is in threaded connection with a nut assembly, the outer wall of the nut assembly is provided with a limiting groove, and the limiting groove is in threaded connection with the screw. The outer wall of the nut assembly is sleeved with a spring guide rail, and the bottom end of the spring guide rail is fixedly connected with a lower stop rod. Through the design of the rotor insert, the nut assembly, the spring guide rail and the sliding ring, the sliding ring cooperates with the lower stop rod and the upper stop rod at the position of the spring guide rail to limit the axial direction of the screw rod; the electronic expansion valve stop structure has the advantages that on the premise that the functional conditions of the electronic expansion valve stop structure are met, a stop rod component and a welding process between the stop rod and the rotor insert are omitted through the stop structure, and cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of expansion valves, and in particular to a stop structure of an electronic expansion valve. Background Art

[0002] Electronic expansion valves are widely used in refrigeration systems as throttling elements to adjust the flow of refrigerant. The basic principle of the electronic expansion valve is to control the rotation of the rotor through the stator coil, and convert the rotational motion of the rotor into the up and down displacement of the valve needle through the spiral feed mechanism, so that the valve needle head approaches or moves away from the valve port, thereby changing the flow area of ​​the valve port, thereby achieving the refrigerant flow regulation and switching functions. At the same time, the electronic expansion valves in the related art are all provided with a stop device to ensure that the up and down displacement of the valve needle is within a predetermined range.

[0003] The stop structure in the prior art includes a nut injection molded part, a rotor insert, a stop rod, a screw rod, a spring guide rail and a slip ring (see the attached drawings of the specification) Fig.11 ); The spring guide has an upper stopper, a lower stopper and a positioning part. In order to achieve axial limit, the lower end of the spring guide is bent multiple times, and the end is clamped in the limit slot of the nut injection molded part through deformation of an external mechanism. The stopper rod and the screw are welded and fixed to the rotor insert as a whole. The rotation of the stopper rod drives the slip ring to move up and down along the spring guide, and the axial limit of the screw is achieved through the upper and lower stoppers of the spring guide; However, the stopper structure in the prior art is complex, and two welding devices are required to weld the screw and the rotor insert respectively (see the attached figure of the specification). Fig.12 Point C), welding of the stopper rod and the rotor insert (see the attached figure in the specification Fig.12 Point D), high equipment and production costs and low production efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an electronic expansion valve stop structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An electronic expansion valve stop structure, comprising a rotor insert, a screw is fixedly sleeved in the middle of the rotor insert, the rotor insert is located at the top of the screw, a nut assembly is threadedly connected to the outer wall of the screw, a limiting groove is provided on the outer wall of the nut assembly, a spring guide is sleeved on the outer wall of the nut assembly, and a lower stop rod is fixedly connected to the bottom end of the spring guide; The outer wall of the rotor insert is fixedly connected with a clamping structure, the top of the spring guide rail is fixedly connected with an upper stop rod, and the upper stop rod is clamped with the rotor insert through the clamping structure; A slip ring is sleeved on the outer wall of the nut assembly, the spring guide rail is in contact with the slip ring, one end of the slip ring is fixedly connected to a limiting protrusion, and the limiting protrusion extends into the limiting groove.

[0006] Preferably, the clamping structure includes a first side protrusion and a second side protrusion, the first side protrusion and the second side protrusion are both fixedly connected to the bottom outer wall of the rotor insert, a first clamping groove is formed between the first side protrusion and the second side protrusion, and the upper stop rod extends into the first clamping groove.

[0007] Preferably, the first side protrusion and the second side protrusion are integrally formed with the rotor insert.

[0008] Preferably, the rotor insert is provided with a second slot at the second side protrusion, the second slot is located above the second side protrusion, the other end of the upper stop rod is fixedly connected with a card joint, the upper stop rod is vertically arranged to the card joint, and the other end of the card joint extends into the second slot.

[0009] Preferably, the lower stop rod, the upper stop rod and the clamping joint are all integrally formed with the spring guide rail, and the limiting protrusion is integrally formed with the slip ring.

[0010] Preferably, a convex ring is provided at the bottom of the screw, the screw and the convex ring are integrally formed, and the external thread of the screw is located at the convex ring.

[0011] Preferably, an inner groove is formed on the inner wall of the bottom of the nut assembly, the inner groove matches the convex ring, and the internal thread of the nut assembly is located at the inner groove.

[0012] Preferably, a nut insert is fixedly sleeved on the bottom outer wall of the nut assembly, the nut assembly and the nut insert are integrally formed, and a through hole is opened on the outer wall of the nut insert.

[0013] Preferably, the top end of the screw is fixedly connected with a connector matching the rotor insert, the rotor insert is fixedly sleeved with the screw via the connector, the connector and the screw are integrally formed, and the bottom end of the screw is a spherical surface.

[0014] The beneficial effects of the present invention are: 1. In the present invention, through the design of the rotor insert, the nut assembly, the spring guide rail and the slip ring, the slip ring cooperates with the lower stop rod and the upper stop rod at the spring guide rail to limit the axial position of the screw; the advantage of such a design is that under the premise of meeting the functional conditions of the electronic expansion valve stop structure, the design structure omits the stop rod component and a welding process between the stop rod and the rotor insert, saving costs.

[0015] 2. Due to the omission of the stop rod component, the present invention can be assembled more simply and quickly compared with the electronic expansion valve stop structure with a stop rod component in the existing design, and the production efficiency is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a front view of an electronic expansion valve stop structure of the present invention.

[0017] Figure 2 An electronic expansion valve stop structure of the present invention Figure 1 Cross-sectional view of AA.

[0018] Figure 3 An electronic expansion valve stop structure of the present invention Figure 1 Schematic diagram of the local structure at point A in the middle.

[0019] Figure 4 An electronic expansion valve stop structure of the present invention Figure 1 Schematic diagram of the local structure at B in the middle Figure 5 The present invention is a schematic structural diagram of a rotor insert of an electronic expansion valve stop structure.

[0020] Figure 6 The present invention is a schematic structural diagram of a screw rod of an electronic expansion valve stop structure.

[0021] Figure 7 The present invention is a schematic structural diagram of a nut assembly and a limiting groove of a stop structure of an electronic expansion valve.

[0022] Figure 8 The present invention is a schematic structural diagram of a nut assembly of an electronic expansion valve stop structure.

[0023] Fig. 9 The present invention is a schematic structural diagram of a spring guide rail of an electronic expansion valve stop structure.

[0024] Fig.10 The present invention is a schematic structural diagram of a slip ring of an electronic expansion valve stop structure.

[0025] Fig.11 It is a front view of the electronic expansion valve stop structure in the prior art.

[0026] Fig.12 It is a top view of the electronic expansion valve stop structure in the prior art.

[0027] Numbers in the figure: 1. rotor insert; 101. first side protrusion; 102. second side protrusion; 103. first slot; 104. second slot; 2. screw; 201. convex ring; 202. connector; 3. nut assembly; 301. limiting groove; 302. inner groove; 4. spring guide; 401. lower stop rod; 402. upper stop rod; 403. clamping joint; 5. slip ring; 501. limiting protrusion; 6. nut insert. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] As attached Figure 1 To Attachment Fig.10 As shown: A stop structure for an electronic expansion valve comprises a rotor insert 1, a screw rod 2 is fixedly sleeved in the middle of the rotor insert 1, the rotor insert 1 is located at the top of the screw rod 2, a nut assembly 3 is threadedly connected to the outer wall of the screw rod 2, a limiting groove 301 is provided on the outer wall of the nut assembly 3, a spring guide rail 4 is sleeved on the outer wall of the nut assembly 3, a lower stop rod 401 is fixedly connected to the bottom end of the spring guide rail 4; a clamping structure is fixedly connected to the outer wall of the rotor insert 1, an upper stop rod 402 is fixedly connected to the top of the spring guide rail 4, and the upper stop rod 402 is mutually clamped with the rotor insert 1 through the clamping structure; a slip ring 5 is sleeved on the outer wall of the nut assembly 3, the spring guide rail 4 contacts the slip ring 5, one end of the slip ring 5 is fixedly connected to a limiting protrusion 501, and the limiting protrusion 501 extends into the limiting groove 301.

[0030] In the above technical solution, when the rotor insert 1 rotates clockwise, the rotor insert 1 drives the screw rod 2 to rise, and the rotor insert 1 drives the spring guide rail 4 to rotate clockwise through the clamping structure. Since the limiting protrusion 501 of the slip ring 5 is inserted into the limiting groove 301, the limiting groove 301 on the outer wall of the nut assembly 3 limits the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will move axially along the direction of the limiting groove 301 and the spring guide rail 4, and the slip ring 5 rises. When the limiting protrusion 501 at the slip ring 5 moves to the upper stop rod 402, the limiting protrusion 501 is blocked and limited by the upper stop rod 402, and the axial movement stops. When the rotor insert 1 rotates counterclockwise, the rotor insert 1 drives the screw rod 2 to descend, and the rotor insert 1 drives the spring guide rail 4 to rotate counterclockwise through the clamping structure. Since the limiting protrusion 501 of the slip ring 5 is inserted into the limiting groove 301, the limiting groove 301 on the outer wall of the nut assembly 3 limits the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will move axially along the direction of the limiting groove 301 and the spring guide rail 4, and the slip ring 5 descends. When the limiting protrusion 501 at the slip ring 5 moves to the lower stop rod 401, the limiting protrusion 501 is blocked and limited by the lower stop rod 401, and the axial movement stops. Therefore, through the design of the rotor insert 1, the nut assembly 3, the spring guide rail 4, and the slip ring 5, the slip ring 5 cooperates with the lower stop rod 401 and the upper stop rod 402 at the spring guide rail 4 to limit the axial position of the screw 2; the advantage of such a design is that under the premise of meeting the functional conditions of the electronic expansion valve stop structure, the design structure omits the stop rod component and a welding process between the stop rod and the rotor insert 1, thereby saving costs.

[0031] As attached Figure 4 To Attachment Figure 5 As shown, the clamping structure includes a first side protrusion 101 and a second side protrusion 102, and the first side protrusion 101 and the second side protrusion 102 are both fixedly connected to the bottom outer wall of the rotor insert 1, and a first clamping groove 103 is formed between the first side protrusion 101 and the second side protrusion 102, and the upper stop rod 402 extends into the first clamping groove 103, and the first side protrusion 101 and the second side protrusion 102 are both integrally formed with the rotor insert 1.

[0032] In the above technical solution, when the rotor insert 1 rotates, the rotor insert 1 can drive the spring guide rail 4 to rotate through the clamping structure.

[0033] As attached Figure 4 To Attachment Figure 5 As shown, the rotor insert 1 is provided with a second slot 104 at the second side protrusion 102, and the second slot 104 is located above the second side protrusion 102. The other end of the upper stop rod 402 is fixedly connected with a clamping joint 403. The upper stop rod 402 and the clamping joint 403 are vertically arranged, and the other end of the clamping joint 403 extends into the second slot 104. The lower stop rod 401, the upper stop rod 402, and the clamping joint 403 are all integrally formed with the spring guide rail 4, and the limiting protrusion 501 is integrally formed with the slip ring 5.

[0034] In the above technical solution, through the design of the second slot 104 and the clamping joint 403, the clamping joint 403 is clamped into the second slot 104, and when the spring guide rail 4 moves up and down, it can drive the spring guide rail 4 to move upward.

[0035] As attached Figure 2As shown, a convex ring 201 is provided at the bottom of the screw 2, and the screw 2 and the convex ring 201 are integrally formed. The external thread of the screw 2 is located at the convex ring 201, and an inner groove 302 is provided on the bottom inner wall of the nut assembly 3, and the inner groove 302 matches the convex ring 201. The internal thread of the nut assembly 3 is located at the inner groove 302.

[0036] In the above technical solution, when the screw rod 2 moves upward, the convex ring 201 cooperates with the inner groove 302 to limit the axial direction of the screw rod 2.

[0037] As attached Figure 2 As shown, a nut insert 6 is fixedly sleeved on the bottom outer wall of the nut assembly 3 , the nut assembly 3 and the nut insert 6 are integrally formed, and a through hole is opened on the outer wall of the nut insert 6 .

[0038] As attached Figure 2 To Attachment Figure 6 As shown, the top end of the screw rod 2 is fixedly connected with a connector 202 matching the rotor insert 1, the rotor insert 1 is fixedly sleeved with the screw rod 2 via the connector 202, the connector 202 and the screw rod 2 are integrally formed, and the bottom end of the screw rod 2 is a spherical surface.

[0039] The specific usage and function of this embodiment are as follows: When the present invention is used, when the rotor insert 1 rotates clockwise, the rotor insert 1 drives the screw rod 2 to rise, and the rotor insert 1 drives the spring guide rail 4 to rotate clockwise through the clamping structure. Since the limiting protrusion 501 of the slip ring 5 is inserted into the limiting groove 301, the limiting groove 301 on the outer wall of the nut assembly 3 limits the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will move axially along the direction of the limiting groove 301 and the spring guide rail 4, and the slip ring 5 rises. When the limiting protrusion 501 at the slip ring 5 moves to the upper stop rod 402, the limiting protrusion 501 is blocked and limited by the upper stop rod 402, and the axial movement stops. When the rotor insert 1 rotates counterclockwise, the rotor insert 1 drives the screw rod 2 to descend, and the rotor insert 1 drives the spring guide rail 4 to rotate counterclockwise through the clamping structure. Since the limiting protrusion 501 of the slip ring 5 is inserted into the limiting groove 301, the limiting groove 301 on the outer wall of the nut assembly 3 limits the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will move axially along the direction of the limiting groove 301 and the spring guide rail 4, and the slip ring 5 descends. When the limiting protrusion 501 at the slip ring 5 moves to the lower stop rod 401, the limiting protrusion 501 is blocked and limited by the lower stop rod 401, and the axial movement stops. Therefore, through the design of the rotor insert 1, the nut assembly 3, the spring guide rail 4, and the slip ring 5, the slip ring 5 cooperates with the lower stop rod 401 and the upper stop rod 402 at the spring guide rail 4 to limit the axial position of the screw rod 2; the advantage of such a design is that under the premise of meeting the functional conditions of the electronic expansion valve stop structure, the design structure omits the stop rod component and a welding process between the stop rod and the rotor insert 1, saving costs; For the above structure and process, please refer to Figure 1-10 .

[0040] The assembly method of the present invention is as follows: first, screw the screw rod 2 into the nut assembly 3; second, the spring guide rail 4 and the slip ring 5 are sleeved outside the nut assembly 3, and the left side of the limiting protrusion 501 at the slip ring 5 is fitted with the right side of the lower stop rod 401 at the spring guide rail 4; finally, the rotor insert 1 and the top fixing sleeve of the screw rod 2 are combined and fixedly welded using welding equipment, and then rotated counterclockwise, and the screw rod 2 drives the rotor insert 1 to descend until the rotor insert 1 moves to the upper stop rod 402 at the top of the spring guide rail 4, and the upper stop rod 402 is clamped into the first clamping groove 103, and the clamping joint 403 is clamped into the second clamping groove 104; Furthermore, due to the omission of the stop rod component, compared with the electronic expansion valve stop structure with a stop rod component in the existing design, the stop structure can be assembled more simply and quickly, and the production efficiency is also improved.

[0041] For the above structure and process, please refer to Figure 1-10 .

[0042] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electronic expansion valve stop structure, comprising a rotor insert (1), characterized in that: A screw rod (2) is fixedly sleeved at the middle of the rotor insert (1), the rotor insert (1) is located at the top of the screw rod (2), a nut assembly (3) is threadedly connected to the outer wall of the screw rod (2), a limiting groove (301) is provided on the outer wall of the nut assembly (3), a spring guide rail (4) is sleeved on the outer wall of the nut assembly (3), and a lower stop rod (401) is fixedly connected to the bottom end of the spring guide rail (4); The outer wall of the rotor insert (1) is fixedly connected with a clamping structure, the top of the spring guide rail (4) is fixedly connected with an upper stop rod (402), and the upper stop rod (402) is clamped with the rotor insert (1) via the clamping structure; A slip ring (5) is sleeved on the outer wall of the nut assembly (3), the spring guide rail (4) is in contact with the slip ring (5), one end of the slip ring (5) is fixedly connected to a limiting protrusion (501), and the limiting protrusion (501) extends into the limiting groove (301).

2. The electronic expansion valve stop structure according to claim 1, characterized in that: The clamping structure comprises a first side protrusion (101) and a second side protrusion (102), the first side protrusion (101) and the second side protrusion (102) are both fixedly connected to the bottom outer wall of the rotor insert (1), a first clamping groove (103) is formed between the first side protrusion (101) and the second side protrusion (102), and the upper stop rod (402) extends into the first clamping groove (103).

3. The electronic expansion valve stop structure according to claim 2, characterized in that: The first side protrusion (101) and the second side protrusion (102) are both integrally formed with the rotor insert (1).

4. The electronic expansion valve stop structure according to claim 2, characterized in that: The rotor insert (1) is provided with a second slot (104) at the second side protrusion (102), the second slot (104) being located above the second side protrusion (102), the other end of the upper stop rod (402) being fixedly connected to a card joint (403), the upper stop rod (402) and the card joint (403) being arranged vertically, and the other end of the card joint (403) extending into the second slot (104).

5. The electronic expansion valve stop structure according to claim 4, characterized in that: The lower stop rod (401), the upper stop rod (402), and the clamping joint (403) are all integrally formed with the spring guide rail (4), and the limiting protrusion (501) is integrally formed with the slip ring (5).

6. The electronic expansion valve stop structure according to claim 1, characterized in that: A convex ring (201) is provided at the bottom of the screw rod (2); the screw rod (2) and the convex ring (201) are integrally formed; and the external thread of the screw rod (2) is located at the convex ring (201).

7. The electronic expansion valve stop structure according to claim 6, characterized in that: An inner groove (302) is provided on the inner wall of the bottom of the nut assembly (3), the inner groove (302) matches the convex ring (201), and the internal thread of the nut assembly (3) is located at the inner groove (302).

8. The electronic expansion valve stop structure according to claim 1, characterized in that: A nut insert (6) is fixedly sleeved on the bottom outer wall of the nut assembly (3); the nut assembly (3) and the nut insert (6) are integrally formed; and a through hole is provided on the outer wall of the nut insert (6).

9. The electronic expansion valve stop structure according to claim 1, characterized in that: The top end of the screw rod (2) is fixedly connected to a connecting head (202) that matches the rotor insert (1); the rotor insert (1) is fixedly sleeved with the screw rod (2) via the connecting head (202); the connecting head (202) and the screw rod (2) are integrally formed; and the bottom end of the screw rod (2) is a spherical surface.

Images