An electronic expansion valve stop structure

Abstract

The invention discloses an electronic expansion valve stop structure, which relates to the technical field of expansion valves and comprises a rotor insert, wherein a screw is fixedly sleeved on the middle part of the rotor insert, the rotor insert is located at the top of the screw, the outer wall of the screw is threadedly connected with a nut assembly, the outer wall of the nut assembly is provided with a limiting groove, the outer wall of the nut assembly is sleeved with a spring guide rail, the bottom end of the spring guide rail is fixedly connected with a lower stop rod; the outer wall of the rotor insert is fixedly connected with a clamping structure, and the invention designs the rotor insert, the nut assembly, the spring guide rail and the slip ring, and the slip ring cooperates with the lower stop rod and the upper stop rod at the spring guide rail to limit the axial direction of the screw; the advantage of such a design is that, on the premise of meeting the functional conditions of the electronic expansion valve stop structure, the stop structure omits the stop rod component and a welding process between the stop rod and the rotor insert, thereby saving costs.

Description

Technical Field

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

[0002] As a throttling element, an electronic expansion valve is widely used in a refrigeration system to regulate the flow rate of refrigerant. The basic principle of the electronic expansion valve is to control the rotation of a rotor through a stator coil, and through a spiral feed mechanism conversion, convert the rotational motion of the rotor into the up and down displacement of a valve needle, so that the head of the valve needle approaches or moves away from the valve port part, thereby changing the flow area of the valve port, so as to achieve the functions of regulating the refrigerant flow rate and switching. At the same time, stop devices are provided in the related art electronic expansion valves to ensure that the up and down displacement of the valve needle is within a predetermined range.

[0003] The existing stop structure includes a nut injection molding 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 Figure 11 ); the spring guide rail has an upper stop part, a lower stop part and a positioning part. In order to achieve axial limit, after the lower end of the spring guide rail is bent multiple times, the end is clamped in the limit card slot of the nut injection molding part through the deformation of an external mechanism. The stop rod and the screw rod are both welded and fixed to the rotor insert as a whole. The rotational motion of the stop rod drives the slip ring to move up and down along the spring guide rail, and the axial limit of the screw rod is realized through the upper and lower stop parts of the spring guide rail;

[0004] However, the existing stop structure is complex, and two welding devices need to be invested to separately weld the screw rod and the rotor insert (see point C in the attached drawings of the specification Figure 12 ), and the welding of the stop rod and the rotor insert (see point D in the attached drawings of the specification Figure 12 ). The equipment and production costs are high, and the production efficiency is low. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a stop structure for an electronic expansion valve.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A stop structure for an electronic expansion valve, including a rotor insert, a screw rod is fixedly sleeved in the middle of the rotor insert, the rotor insert is located at the top of the screw rod, a nut assembly is threadedly connected to the outer wall of the screw rod, a limit groove is opened on the outer wall of the nut assembly, a spring guide rail 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 rail;

[0008] A clamping structure is fixedly connected to the outer wall of the rotor insert, an upper stop rod is fixedly connected to the top of the spring guide rail, and the upper stop rod is clamped with the rotor insert through the clamping structure;

[0009] A sliding ring is sleeved on the outer wall of the nut assembly. The spring guide rail is in contact with the sliding ring. One end of the sliding ring is fixedly connected with a limiting protrusion, and the limiting protrusion extends into the limiting groove.

[0010] Preferably, the clamping structure includes a first side protrusion and a second side protrusion. Both the first side protrusion and the second side protrusion are 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.

[0011] Preferably, both the first side protrusion and the second side protrusion are integrally formed with the rotor insert.

[0012] Preferably, the rotor insert is provided with a second clamping groove at the position of the second side protrusion. The second clamping groove is located above the second side protrusion. The other end of the upper stop rod is fixedly connected with a clamping head. The upper stop rod is perpendicular to the clamping head, and the other end of the clamping head extends into the second clamping groove.

[0013] Preferably, the lower stop rod, the upper stop rod, and the clamping head are all integrally formed with the spring guide rail, and the limiting protrusion is integrally formed with the sliding ring.

[0014] Preferably, a convex ring is provided at the bottom of the screw rod. The screw rod and the convex ring are integrally formed. The external thread of the screw rod is located at the convex ring.

[0015] Preferably, an inner groove is formed in the bottom inner wall of the nut assembly. The inner groove is matched with the convex ring. The internal thread of the nut assembly is located at the inner groove.

[0016] 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. Through holes are formed in the outer wall of the nut insert.

[0017] Preferably, a connecting head matching the rotor insert is fixedly connected to the top end of the screw rod. The rotor insert is fixedly sleeved on the screw rod through the connecting head. The connecting head and the screw rod are integrally formed. The bottom end of the screw rod is spherical.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, through the designs of the rotor insert, the nut assembly, the spring guide rail, and the sliding ring, the lower stop rod and the upper stop rod at the sliding ring and the spring guide rail cooperate to work, thereby limiting the axial direction of the screw rod. The advantage of such a design is that on the premise of meeting the functional conditions of the stop structure of the electronic expansion valve, this design structure eliminates the stop rod component and a welding process between the stop rod and the rotor insert, saving costs.

[0020] 2. Due to the omission of the stop rod component in the present invention, compared with the stop structure of the electronic expansion valve with a stop rod component in the existing design, this stop structure can be assembled more simply and quickly, and at the same time, the production efficiency is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The front view of a stop structure of an electronic expansion valve according to the present invention.

[0022] Figure 2 A stop structure of an electronic expansion valve according to the present invention Figure 1 The sectional view taken along line A-A.

[0023] Figure 3 A stop structure of an electronic expansion valve according to the present invention Figure 1 The partial structural schematic diagram at position A.

[0024] Figure 4 A stop structure of an electronic expansion valve according to the present invention Figure 1 The partial structural schematic diagram at position B

[0025] Figure 5 The structural schematic diagram of the rotor insert of a stop structure of an electronic expansion valve according to the present invention.

[0026] Figure 6 The structural schematic diagram of the screw of a stop structure of an electronic expansion valve according to the present invention.

[0027] Figure 7 The structural schematic diagram of the nut assembly and the limit groove of a stop structure of an electronic expansion valve according to the present invention.

[0028] Figure 8 The structural schematic diagram of the nut assembly of a stop structure of an electronic expansion valve according to the present invention.

[0029] Figure 9 The structural schematic diagram of the spring guide rail of a stop structure of an electronic expansion valve according to the present invention.

[0030] Figure 10 The structural schematic diagram of the slip ring of a stop structure of an electronic expansion valve according to the present invention.

[0031] Figure 11 The front view of the stop structure of the electronic expansion valve in the prior art.

[0032] Figure 12 The top view of the stop structure of the electronic expansion valve in the prior art.

[0033] Reference numerals in the figure: 1, rotor insert; 101, first side bump; 102, second side bump; 103, first card slot; 104, second card 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, card joint; 5, slip ring; 501, limiting projection; 6, nut insert. Detailed implementation

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] As shown in the attached Figure 1 to the attached Figure 10 figure:

[0036] A stop structure for an electronic expansion valve includes a rotor insert 1. A screw 2 is fixedly sleeved in the middle of the rotor insert 1. The rotor insert 1 is located at the top of the screw 2. The outer wall of the screw 2 is threadedly connected with a nut assembly 3. A limiting groove 301 is provided on the outer wall of the nut assembly 3. A spring guide 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 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 4. The upper stop rod 402 is 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 4 is in contact with the slip ring 5. A limiting projection 501 is fixedly connected to one end of the slip ring 5. The limiting projection 501 extends into the limiting groove 301.

[0037] In the above technical solution, when the rotor insert 1 rotates clockwise, the rotor insert 1 drives the screw 2 to rise. The rotor insert 1 drives the spring guide 4 to rotate clockwise through the clamping structure. Since the limiting projection 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 restricts 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 4. The slip ring 5 rises. When the limiting projection 501 at the slip ring 5 moves to the upper stop rod 402, the limiting projection 501 is blocked and limited by the upper stop rod 402, and the axial movement stops;

[0038] When the rotor insert 1 rotates counterclockwise, the rotor insert 1 drives the screw rod 2 to descend. 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 restricts the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will perform axial movement 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 terminates.

[0039] Therefore, through the design of the rotor insert 1, the nut assembly 3, the spring guide rail 4, and the slip ring 5, the lower stop rod 401 and the upper stop rod 402 at the slip ring 5 and the spring guide rail 4 cooperate to work, thereby limiting the axial direction of the screw rod 2. The advantage of such a design is that on the premise of meeting the function conditions of the stop structure of the electronic expansion valve, this design structure eliminates the stop rod component and a welding process between the stop rod and the rotor insert 1, saving costs.

[0040] As shown in the attached Figure 4 to the attached Figure 5 As shown, the clamping structure includes a first side convex block 101 and a second side convex block 102. Both the first side convex block 101 and the second side convex block 102 are fixedly connected to the bottom outer wall of the rotor insert 1. A first clamping groove 103 is formed between the first side convex block 101 and the second side convex block 102. The upper stop rod 402 extends into the first clamping groove 103. Both the first side convex block 101 and the second side convex block 102 are integrally formed with the rotor insert 1.

[0041] 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.

[0042] As shown in the attached Figure 4 to the attached Figure 5 As shown, the rotor insert 1 is provided with a second clamping groove 104 at the second side convex block 102. The second clamping groove 104 is located above the second side convex block 102. The other end of the upper stop rod 402 is fixedly connected with a clamping head 403. The upper stop rod 402 and the clamping head 403 are perpendicularly arranged. The other end of the clamping head 403 extends into the second clamping groove 104. The lower stop rod 401, the upper stop rod 402, and the clamping head 403 are all integrally formed with the spring guide rail 4. The limiting protrusion 501 is integrally formed with the slip ring 5.

[0043] In the above technical solution, through the design of the second clamping groove 104 and the clamping head 403, the clamping head 403 is clamped into the second clamping groove 104. When the spring guide rail 4 moves up and down, it can drive the spring guide rail 4 to move upward.

[0044] As shown in the attached Figure 2As shown, 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. The external thread of the screw rod 2 is located at the convex ring 201. An inner groove 302 is formed in the inner wall of the bottom of the nut assembly 3. The inner groove 302 is matched with the convex ring 201. The internal thread of the nut assembly 3 is located at the inner groove 302.

[0045] In the above technical solution, when the screw rod 2 moves upward, the cooperation between the convex ring 201 and the inner groove 302 can limit the axial direction of the screw rod 2.

[0046] As shown in the attached Figure 2 As shown, a nut insert 6 is fixedly sleeved on the outer wall of the bottom of the nut assembly 3. The nut assembly 3 and the nut insert 6 are integrally formed. A through hole is formed in the outer wall of the nut insert 6.

[0047] As shown in the attached Figure 2 to the attached Figure 6 As shown, a connection head 202 matching the rotor insert 1 is fixedly connected to the top end of the screw rod 2. The rotor insert 1 is fixedly sleeved on the screw rod 2 through the connection head 202. The connection head 202 and the screw rod 2 are integrally formed. The bottom end of the screw rod 2 is spherical.

[0048] Specific usage and functions of this embodiment:

[0049] When the present invention is in use, when the rotor insert 1 rotates clockwise, the rotor insert 1 drives the screw rod 2 to rise. 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 restricts the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will perform axial movement along the direction of the limiting groove 301 and the spring guide rail 4. 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 terminates;

[0050] When the rotor insert 1 rotates counterclockwise, the rotor insert 1 drives the screw rod 2 to descend. 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 restricts the radial rotation of the slip ring 5. Therefore, at this time, the slip ring 5 will perform axial movement along the direction of the limiting groove 301 and the spring guide rail 4. 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 terminates;

[0051] Therefore, through the design of the rotor insert 1, nut assembly 3, spring guide 4, and slip ring 5, the slip ring 5 cooperates with the lower stop rod 401 and upper stop rod 402 at the spring guide 4 to limit the axial direction of the screw rod 2. The advantage of this design is that on the premise of meeting the functional conditions of the stop structure of the electronic expansion valve, this design structure eliminates the stop rod component and a welding process between the stop rod and the rotor insert 1, saving costs.

[0052] Please refer to the above structure and process Figures 1 - 10 .

[0053] The assembly method of the present invention: First, screw the screw rod 2 into the nut assembly 3. Secondly, the spring guide 4 and the slip ring 5 are sleeved outside the nut assembly 3, and the left side of the limit protrusion 501 at the slip ring 5 fits with the right side of the lower stop rod 401 at the spring guide 4. Finally, fix and weld the rotor insert 1 and the top end of the screw rod 2 by using a welding device, and then rotate counterclockwise. 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 4, snap the upper stop rod 402 into the first card slot 103, and snap the card joint 403 into the second card slot 104.

[0054] Moreover, due to the omission of the stop rod component, compared with the stop structure of the electronic expansion valve with a stop rod component in the existing design, this stop structure can be assembled more simply and quickly, and at the same time, the production efficiency is also improved.

[0055] Please refer to the above structure and process Figures 1 - 10 .

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within 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; The outer wall of the nut assembly (3) is sleeved with a slip ring (5), 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); 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); 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); 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.

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

3. The electronic expansion valve stop structure according to claim 1, 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).

4. 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).

5. The electronic expansion valve stop structure according to claim 4, 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).

6. 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).

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