Electronic expansion valve

Abstract

The present invention provides an electronic expansion valve, comprising: a valve seat assembly having a first connection port and a second connection port communicating with an external pipeline; a valve core assembly, a part of which is disposed through the valve seat assembly and can extend into the valve seat assembly to control the on-off state between the first connection port and the second connection port; a screw rod connected to the valve seat assembly, the valve core assembly passing through the screw rod, the screw rod having a first small-diameter section and a large-diameter section connected in sequence, the first small-diameter section extending into the valve core assembly, and an end face outer edge of the large-diameter section close to the first small-diameter section having a stop projection, and a gap is provided between the stop projection and the first small-diameter section, and when the electronic expansion valve is fully closed, the valve core assembly abuts against the stop projection. The present invention solves the problem of a large number of components in the electronic expansion valve in the prior art.

Description

Technical Field

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

[0002] In the existing electronic expansion valve, the sleeve seat is usually press-fitted onto the valve seat with an interference fit. Then, after furnace welding and screw machining, it is necessary to first injection mold a stop block (made of plastic), and then press-fit it into the inner hole of the valve seat with an interference fit. Although this process has relatively simple parts and is easy to process, it has a large number of parts, many assembly processes, and high costs, and is not suitable for mass production. Summary of the Invention

[0003] The main object of the present invention is to provide an electronic expansion valve to solve the problem of a large number of components in the existing electronic expansion valve.

[0004] To achieve the above object, the present invention provides an electronic expansion valve, comprising: a valve seat assembly having a first connection port and a second connection port communicating with an external pipeline; a valve core assembly, a part of which is inserted through the valve seat assembly and can extend into the valve seat assembly to control the on-off state between the first connection port and the second connection port; a screw, which is connected to the valve seat assembly, the valve core assembly passes through the screw, the screw has a first small-diameter section and a large-diameter section connected in sequence, the first small-diameter section extends into the valve core assembly, and the outer edge of the end face of the large-diameter section close to the first small-diameter section has a stop projection, and there is a gap between the stop projection and the first small-diameter section, and when the electronic expansion valve is fully closed, the valve core assembly abuts against the stop projection.

[0005] Further, the screw and the valve seat assembly are formed by separate machining. The screw further includes a second small-diameter section, the second small-diameter section is connected to the end of the large-diameter section away from the first small-diameter section, the second small-diameter section extends into the valve seat assembly, and the positioning step formed by the large-diameter section abuts against the valve seat assembly.

[0006] Further, the screw and the valve seat assembly are integrally formed.

[0007] Further, the first small-diameter section includes: a threaded section, which is threadedly connected to the valve core assembly; a guiding section, both ends of which are respectively connected to the threaded section and the large-diameter section, the guiding section extends into the valve core assembly, and the valve core assembly moves along the guiding direction of the guiding section.

[0008] Further, the valve core assembly includes: a rotor, which is rotatably arranged; a nut, which is located inside the rotor and rotates synchronously with the rotor, the nut is sleeved on the outside of the first small-diameter section and is threadedly connected to the threaded section; a valve needle, which passes through the screw and abuts against the nut, and the valve needle moves axially away from the valve seat assembly under the drive of the nut to open the channel between the first connection port and the second connection port.

[0009] Further, the nut axially extends with a predetermined length, and the nut covers the outer sides of the threaded section and the guiding section.

[0010] Further, one end of the nut close to the stop projection has a radially extending protrusion, and the protrusion abuts against the stop projection.

[0011] Further, one end of the valve needle away from the valve seat assembly has a radially protruding bump, and the nut abuts against and presses the bump to drive the valve needle to move away from the valve seat assembly.

[0012] Further, the valve core assembly further includes a reset member, and two ends of the reset member respectively abut against the nut and the valve needle, and drive the valve needle to move towards the valve seat assembly when the nut moves towards the valve seat assembly.

[0013] Further, the electronic expansion valve further includes a sleeve, the sleeve is connected to the valve seat assembly, and an accommodation cavity is formed with the valve seat assembly. Both the first connection port and the second connection port are located outside the accommodation cavity, and the valve core assembly and the screw rod are located inside the accommodation cavity.

[0014] Further, the valve seat assembly includes: a valve seat having a first connection port and a second connection port; a sleeve seat disposed outside the valve seat and connected to the valve seat, and the sleeve is connected to the sleeve seat.

[0015] Further, the screw rod is first made into a blank by a cold heading process and then processed by a special machine for metal processing.

[0016] Applying the technical solution of the present invention, by providing a positioning step and a stop projection on the screw rod, it is not necessary to additionally provide parts for positioning and stopping, reducing the number of parts of the electronic expansion valve, thereby reducing the injection molding process, improving efficiency, and the structure of the screw rod becomes complex, so it cannot be processed with a bar stock, so it is necessary to use the "blank + special machine" method for processing, which is beneficial to further improving the processing efficiency. Compared with the existing assembly method, the number of parts is reduced, the assembly process is simplified, the cost is reduced, and it is suitable for mass production. The positioning step on the screw rod can assist in the installation of the screw rod. When the positioning step abuts against the valve seat assembly, it indicates that the screw rod is installed in place, thereby controlling the position of the screw rod on the valve seat assembly. The stop projection can control the movement range of the valve core assembly. When the valve core assembly completely blocks the channel between the first connection port and the second connection port, that is, when the electronic expansion valve is completely closed, the valve core assembly abuts against the stop projection and thus cannot continue to move, avoiding over-positioning of the valve core assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 The structural schematic diagram of the electronic expansion valve according to the first embodiment of the present invention is shown;

[0019] Figure 2 shown Figure 1 the structural schematic diagram of the valve seat assembly and the screw of the electronic expansion valve in

[0020] Figure 3 shown Figure 1 the structural schematic diagram of the screw of the electronic expansion valve in

[0021] Figure 4 The structural schematic diagram of the electronic expansion valve according to the second embodiment of the present invention is shown;

[0022] Figure 5 shown Figure 4 the structural schematic diagram of the valve seat assembly and the screw of the electronic expansion valve in; and

[0023] Figure 6 shown Figure 4 the structural schematic diagram of the screw of the electronic expansion valve in.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 10, valve seat assembly; 11, first connection port; 12, second connection port; 13, valve seat; 14, sleeve seat; 20, valve core assembly; 21, rotor; 22, nut; 23, valve needle; 231, convex block; 24, reset member; 30, screw; 31, first small diameter section; 311, thread section; 312, guiding section; 32, large diameter section; 33, second small diameter section; 34, stop projection; 40, sleeve; 50, integral part. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0028] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation words do not limit the present invention.

[0029] To solve the problem of a large number of components in the existing electronic expansion valve, the present invention provides an electronic expansion valve.

[0030] Embodiment 1

[0031] As Figures 1 to 3 shown, an electronic expansion valve includes a valve seat assembly 10, a valve core assembly 20, and a screw 30. The valve seat assembly 10 has a first connection port 11 and a second connection port 12 that communicate with an external pipeline. A part of the valve core assembly 20 is inserted through the valve seat assembly 10 and can extend into the valve seat assembly 10 to control the on-off state between the first connection port 11 and the second connection port 12. The screw 30 is connected to the valve seat assembly 10. The valve core assembly 20 passes through the screw 30. The screw 30 has a first small-diameter section 31 and a large-diameter section 32 connected in sequence. The first small-diameter section 31 extends into the valve core assembly 20. The outer edge of the end face of the large-diameter section 32 close to the first small-diameter section 31 has a stop projection 34, and there is a gap between the stop projection 34 and the first small-diameter section 31. When the electronic expansion valve is fully closed, the valve core assembly 20 abuts against the stop projection 34.

[0032] In this embodiment, by providing a positioning step and a stop projection 34 on the screw 30, there is no need to additionally provide parts for positioning and stopping, reducing the number of components of the electronic expansion valve, thereby reducing the injection molding process and improving efficiency. Moreover, the structure of the screw 30 becomes more complex, so it cannot be processed with bar stock. Therefore, the "blank + special machine" method needs to be used for processing, which is conducive to further improving the processing efficiency. Compared with the existing assembly method, the number of parts is reduced, the assembly process is simplified, the cost is reduced, and it is suitable for mass production. The positioning step on the screw 30 can assist in the installation of the screw 30. When the positioning step abuts against the valve seat assembly 10, it indicates that the screw 30 is installed in place, thereby controlling the position of the screw 30 on the valve seat assembly 10. The stop projection 34 can control the movement range of the valve core assembly 20. When the valve core assembly 20 completely blocks the channel between the first connection port 11 and the second connection port 12, that is, when the electronic expansion valve is completely closed, the valve core assembly 20 abuts against the stop projection 34 and thus cannot continue to move, avoiding over-positioning of the valve core assembly 20.

[0033] In this embodiment, the screw 30 and the valve seat assembly 10 are formed by separate machining. The screw 30 further includes a second small-diameter section 33. The second small-diameter section 33 is connected to the end of the large-diameter section away from the first small-diameter section 31. The second small-diameter section 33 extends into the valve seat assembly 10, and there is an interference fit between them. The fixed connection is achieved by the pre-tightening force between them. The positioning step formed by the large-diameter section 32 abuts against the valve seat assembly 10, thereby ensuring the installation accuracy of the screw 30.

[0034] In this embodiment, the first small-diameter section 31 includes a threaded section 311 and a guiding section 312. The threaded section 311 is threadedly connected to the valve core assembly 20. The threaded section 311 is used to control the circumferential movement of the valve core assembly 20. When the valve core assembly 20 rotates, due to the effect of the thread, the valve core assembly 20 moves axially while rotating, thereby changing the distance extending into the valve seat assembly 10, and thus changing the on-off state between the first connection port 11 and the second connection port 12, realizing the function of the valve. The guiding section 312 mainly plays a guiding role. The two ends of the guiding section 312 are respectively connected to the threaded section 311 and the large-diameter section 32, that is, the guiding section 312 is arranged between the threaded section 311 and the large-diameter section 32. The guiding section 312 extends into the valve core assembly 20. When the valve core assembly 20 moves, the valve core assembly 20 moves along the guiding direction of the guiding section 312, that is, the axial direction of the guiding section 312, to avoid the shaking of the valve core assembly 20.

[0035] In this embodiment, the valve core assembly 20 includes a rotor 21, a nut 22, and a valve needle 23. The rotor 21 is rotatably arranged; the nut 22 is located inside the rotor 21 and rotates synchronously with the rotor 21. The nut 22 is sleeved on the outside of the first small-diameter section 31 and is threadedly connected to the threaded section 311; the valve needle 23 penetrates through the screw 30 and abuts against the nut 22. The first small-diameter section 31 is located between the nut 22 and the valve needle 23. The valve needle 23 moves axially away from the valve seat assembly 10 under the drive of the nut 22 to open the channel between the first connection port 11 and the second connection port 12. When the rotor 21 rotates under the drive of the energized coil, the rotor 21 drives the nut 22 to rotate together. Due to the threaded fit between the nut 22 and the screw 30, the nut 22 will also move axially while rotating. The movement of the nut 22 abuts against the valve needle 23, so that the valve core moves away from the valve seat assembly 10 under the extrusion of the nut 22, thereby switching the electronic expansion valve from fully closed to fully open.

[0036] In this embodiment, the nut 22 extends axially by a predetermined length, and the specific size can be determined according to the actual situation. Moreover, the nut 22 covers the outside of the threaded section 311 and the guiding section 312, that is, the nut 22 not only cooperates with the threaded section 311 to realize axial movement, but also cooperates with the guiding section 312 to realize the guiding function. In this way, only by lengthening the length of the nut 22 can it be achieved, without adding additional components, further reducing the number of components of the electronic expansion valve, which is beneficial to improving the processing efficiency.

[0037] Optionally, since there is a gap between the stop projection 34 and the first small-diameter section 31 in this embodiment, and the nut 22 usually abuts closely against the first small-diameter section 31, a radially extending protrusion is provided at one end of the nut 22 close to the stop projection 34. The protrusion abuts against the stop projection 34, so as to ensure that the stop projection 34 can effectively and reliably stop the movement of the nut 22, that is, stop the valve core assembly 20.

[0038] In this embodiment, one end of the valve needle 23 away from the valve seat assembly 10 has a radially protruding bump 231. One end of the nut 22 abuts against the bump 231. When the nut 22 moves axially, the nut 22 will squeeze the bump 231, thereby driving the valve needle 23 to move away from the valve seat assembly 10.

[0039] Optionally, the nut 22 of this embodiment only abuts against one side of the bump 231, and the nut 22 can only drive the valve needle 23 to move away from the valve seat assembly 10. Therefore, the valve core assembly 20 further includes a reset member 24. The reset member 24 is a reset spring. The reset member 24 is sleeved on the valve needle 23, and its two ends respectively abut against the nut 22 and the valve needle 23, and drive the valve needle 23 to move towards the valve seat assembly 10 when the nut 22 moves towards the valve seat assembly 10, and at the same time keep the bump 231 tightly attached to the nut 22, so that the nut 22 and the valve needle 23 achieve synchronous movement. Of course, the nut 22 can also be abutted against both sides of the bump 231. In this way, the reset member 24 does not have to be provided. The movement of the nut 22 in two directions can respectively squeeze different surfaces of the bump 231 to realize the driving of the valve needle 23 in two directions.

[0040] In this embodiment, the electronic expansion valve further includes a sleeve 40. The sleeve 40 is connected to the valve seat assembly 10 and forms a receiving cavity with the valve seat assembly 10. Both the first connection port 11 and the second connection port 12 are located outside the receiving cavity. The valve core assembly 20 and the screw 30 are located inside the receiving cavity. The sleeve 40 protects the non-exposed structure of the electronic expansion valve without affecting the normal use of the electronic expansion valve. At the same time, the energized coil can be wound around the outside of the sleeve 40 to realize the driving of the rotor 21.

[0041] In this embodiment, the valve seat assembly 10 includes a valve seat 13 and a sleeve seat 14. The valve seat 13 has a first connection port 11 and a second connection port 12. The second small-diameter section 33 extends into the valve seat 13 and is in interference fit with the valve seat 13. When the second small-diameter section 33 is inserted into the valve seat 13 by means of press-fitting or the like, the positioning step abuts against the valve seat 13, indicating that the installation is in place. The valve seat 13 provides basic support as the basic component of the electronic expansion valve. The sleeve seat 14 is arranged outside the valve seat 13 and is connected to the valve seat 13. The sleeve 40 is connected to the sleeve seat 14. The sleeve seat 14 is used for the installation of the sleeve 40, and a coil disc can also be arranged on the sleeve seat 14 for combing and winding the coil.

[0042] Optionally, the screw 30 is first made into a blank by cold heading process and then processed by a special metal processing machine.

[0043] Embodiment Two

[0044] The difference from Embodiment One is that the screw 30 and the valve seat assembly 10 are integrally processed.

[0045] As Figures 4 to 6 shown, the screw 30 and the valve seat assembly 10 are integrally processed to form an integral part 50, that is, the screw 30, the valve seat 13, and the sleeve seat 14 are integrally processed to form the integral part 50, thereby further reducing the number of parts of the electronic expansion valve, reducing the injection molding process, improving efficiency, and being conducive to mass production.

[0046] It should be noted that the multiple in the above embodiments refers to at least two.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0048] 1. Solve the problem of many parts of the electronic expansion valve in the prior art;

[0049] 2. Reduce the number of parts of the electronic expansion valve, thereby reducing the injection molding process and improving efficiency;

[0050] 3. The screw and the valve seat assembly are integrally processed, thereby further reducing the number of parts of the electronic expansion valve;

[0051] 4. The "blank + special machine" method is used for processing, which is conducive to further improving the processing efficiency and is suitable for mass production;

[0052] 5. The positioning step controls the position of the screw on the valve seat assembly;

[0053] 6. The stop protrusion can control the movement range of the valve core assembly and prevent the valve core assembly from moving over-position.

[0054] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0055] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that, Comprising: A valve seat assembly (10), the valve seat assembly (10) having a first connection port (11) and a second connection port (12) communicating with an external pipeline; A valve core assembly (20), a part of the valve core assembly (20) being inserted through the valve seat assembly (10) and capable of extending into the valve seat assembly (10) to control the on-off state between the first connection port (11) and the second connection port (12); A screw (30), the screw (30) being connected to the valve seat assembly (10), the valve core assembly (20) passing through the screw (30), the screw (30) having a first small-diameter section (31) and a large-diameter section (32) connected in sequence, the first small-diameter section (31) extending into the valve core assembly (20), an outer edge of an end face of the large-diameter section (32) close to the first small-diameter section (31) having a stop projection (34), the stop projection (34) being integrally provided on the screw (30), and a gap being provided between the stop projection (34) and the first small-diameter section (31), when the electronic expansion valve is fully closed, the valve core assembly (20) abuts against the stop projection (34); A positioning step is provided on the screw (30), when the screw (30) is installed in place, the positioning step abuts against the valve seat assembly (10); The first small-diameter section (31) includes: a threaded section (311), the threaded section (311) being threadedly connected to the valve core assembly (20); The valve core assembly (20) includes: A rotor (21), the rotor (21) being rotatably provided; A nut (22), the nut (22) being located inside the rotor (21) and rotating synchronously with the rotor (21), the nut (22) being sleeved outside the first small-diameter section (31) and threadedly connected to the threaded section (311); A valve needle (23), the valve needle (23) passing through the screw (30) and abutting against the nut (22), the valve needle (23) moving axially in a direction away from the valve seat assembly (10) under the drive of the nut (22) to open a channel between the first connection port (11) and the second connection port (12).

2. The electronic expansion valve according to claim 1, characterized in that, The screw (30) and the valve seat assembly (10) are formed by separate machining, the screw (30) further includes a second small-diameter section (33), the second small-diameter section (33) being connected to an end of the large-diameter section away from the first small-diameter section (31), the second small-diameter section (33) extending into the valve seat assembly (10), and a positioning step formed by the large-diameter section (32) abuts against the valve seat assembly (10).

3. The electronic expansion valve according to claim 1, characterized in that, The screw (30) and the valve seat assembly (10) are integrally machined.

4. The electronic expansion valve according to claim 1, characterized in that, The first small-diameter section (31) further includes: A guiding section (312), both ends of the guiding section (312) being connected to the threaded section (311) and the large-diameter section (32) respectively, the guiding section (312) extending into the valve core assembly (20), and the valve core assembly (20) moving along the guiding direction of the guiding section (312).

5. The electronic expansion valve according to claim 4, characterized in that, The nut (22) extends axially by a predetermined length, and the nut (22) covers the outer sides of the threaded section (311) and the guiding section (312).

6. The electronic expansion valve according to claim 4, characterized in that, One end of the nut (22) close to the stop projection (34) has a radially extending protrusion which abuts against the stop projection (34).

7. The electronic expansion valve according to claim 4, characterized in that, One end of the valve needle (23) away from the valve seat assembly (10) has a radially protruding bump (231), and the nut (22) abuts against and presses the bump (231) to drive the valve needle (23) to move away from the valve seat assembly (10).

8. The electronic expansion valve according to claim 7, characterized in that, The valve core assembly (20) further includes a reset member (24). Both ends of the reset member (24) abut against the nut (22) and the valve needle (23) respectively, and drive the valve needle (23) to move towards the valve seat assembly (10) when the nut (22) moves towards the valve seat assembly (10).

9. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a sleeve (40). The sleeve (40) is connected to the valve seat assembly (10) and forms a receiving cavity with the valve seat assembly (10). Both the first connection port (11) and the second connection port (12) are located outside the receiving cavity, and the valve core assembly (20) and the screw (30) are located inside the receiving cavity.

10. The electronic expansion valve according to claim 9, characterized in that, The valve seat assembly (10) includes: A valve seat (13) which has the first connection port (11) and the second connection port (12); A sleeve seat (14) which is arranged outside the valve seat (13) and connected to the valve seat (13), and the sleeve (40) is connected to the sleeve seat (14).

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