Electronic expansion valve

Abstract

The present invention discloses a valve housing (10) having a receiving chamber (11) and a valve port (12), the receiving chamber (11) being in communication with the valve port (12), a spindle (20) having a first end (21) and a second end (22) provided opposite to each other, the second end (22) sealing or opening the valve port (12), and including a first guide segment (23), a threaded segment (24) and a second guide segment (25) provided in that order, the first guide segment (23) being provided adjacent to the first end (21) of the spindle (20) and the second guide segment (25) being provided adjacent to the second end (22) of the spindle (20), and a valve housing (10) provided within the receiving chamber (11) and connected to the valve port (12). The electronic expansion valve includes a nut seat (30) fixedly connected to a spring (10) and including a first through hole (31) including a first guide hole segment (311), a threaded hole segment (312) and a second guide hole segment (313) arranged in that order, the spindle (20) is inserted into the first through hole (31), the first guide hole segment (311) is engaged with and guided by the first guide segment (23), the threaded hole segment (312) is screwed into the threaded segment (24), and the second guide hole segment (313) is engaged with and guided by the second guide segment (25), thereby solving the problem of poor concentricity between the spindle and the valve port in the prior art.

Description

Technical Field

[0001] This application claims the priority of a patent application with the application number 202122862189.3 and the invention title "Electronic Expansion Valve", which was filed with the China National Intellectual Property Administration on November 19, 2021.

[0002] This application relates to the technical field of expansion valves, and specifically to electronic expansion valves.

Background Art

[0003] In the prior art, a male thread is provided on the spindle of the electronic expansion valve, and this male thread is screwed into the female thread of the nut seat. By rotating the spindle relative to the nut seat, the valve port is sealed or opened. However, due to the simple structure of the conventional device, the coaxiality between the spindle and the valve port is relatively poor, and furthermore, it reduces the control accuracy of the entire electronic expansion valve.

Summary of the Invention

[0004] This application provides an electronic expansion valve for solving the problem of poor coaxiality between the spindle and the valve port in the prior art.

[0005] This application provides an electronic expansion valve including a valve housing having a receiving chamber and a valve port, with the receiving chamber communicating with the valve port, a spindle having oppositely provided first and second ends, where the second end seals or opens the valve port, including a first guide segment, a threaded segment, and a second guide segment provided in sequence, the first guide segment being provided close to the first end of the spindle, the second guide segment being provided close to the second end of the spindle, and a nut seat provided in the receiving chamber and fixedly connected to the valve housing, having a first through hole including a first guide hole segment, a threaded hole segment, and a second guide hole segment provided in sequence, the spindle being inserted into the first through hole, the first guide hole segment being engaged with and guided by the first guide segment, the threaded hole segment being screwed with the threaded segment, and the second guide hole segment being engaged with and guided by the second guide segment.

[0006] Applying the technical aspect of this application, by engaging and guiding the first guide hole segment with the first guide segment and providing the first guide segment close to the first end of the spindle, the spindle, especially the part close to the first end of the spindle, can be guided. And by engaging and guiding the second guide hole segment with the second guide segment and providing the second guide segment close to the second end of the spindle, the part of the spindle close to the second end of the spindle can be guided. By the engagement of the guide structures at both ends of the spindle, the coaxiality between the spindle and the valve port can be maintained relatively high, thereby improving the control accuracy of the entire electronic expansion valve.

[0007] Furthermore, the first guide hole segment and the first guide segment are in a clearance fit, and the second guide hole segment and the second guide segment are in a clearance fit. In this way, the stable movement of the spindle can be ensured, and the guiding effect on the spindle can be ensured.

[0008] Furthermore, the diameter of the first guide segment is larger than the diameter of the screw segment, and the diameter of the screw segment is larger than the diameter of the second guide segment. With such a design, it becomes easy to install the spindle into the first through hole from above the first through hole, improving the installation efficiency.

[0009] Furthermore, the nut seat is provided with a vent hole communicating with the first through hole. The vent hole is used to equalize the air pressure in the first through hole and the accommodation chamber, enabling the spindle to move smoothly.

[0010] Furthermore, a first hole segment is provided between the screw hole segment and the second guide hole segment. The inner diameter of the first hole segment is larger than the inner diameter of the second guide hole segment and smaller than the inner diameter of the screw hole segment. The vent hole is provided on the side wall of the first hole segment. In this way, the air pressure in the first through hole and the accommodation chamber can be well equalized.

[0011] Furthermore, the spindle further includes a third guide segment provided on the side of the first guide segment away from the screw segment. The electronic expansion valve is provided in the accommodation chamber and further includes a magnetic rotor fixedly connected to the third guide segment. When the magnetic rotor rotates, the third guide segment and the spindle are rotated in conjunction, rotating the spindle relative to the nut seat and moving it along the axial direction.

[0012] Furthermore, the diameter of the third guide segment is smaller than the diameter of the first guide segment. With such a design, the structure of the electronic expansion valve becomes compact, and the volume can be reduced.

[0013] Furthermore, the electronic expansion valve further includes a connection plate provided in the magnetic rotor and fixedly connected to the magnetic rotor at its outer peripheral edge. A second through hole is provided in the connection plate. The second through hole and the first through hole are coaxially provided. The third guide segment is inserted into the second through hole and fixedly connected to the inner wall of the second through hole. By providing the connection plate, the connection stability between the third guide segment and the magnetic rotor is enhanced.

[0014] Furthermore, the electronic expansion valve further includes a stopper, and a fixing structure is provided between the stopper and the nut seat. The upper surface of the stopper is fixedly connected to the bottom surface of the connection plate, and a third through hole is provided in the stopper. The third through hole includes a second hole segment and a third hole segment that communicate with each other. The inner diameter of the second hole segment is smaller than the inner diameter of the third hole segment. A third guide segment is inserted into the third through hole, and the third guide segment and the second hole segment are in transitional fit. Since the third guide segment and the second hole segment are in transitional fit, the second hole segment can guide the third guide segment.

[0015] Furthermore, the fixing structure includes a first stopping protrusion and a second stopping protrusion provided on the inner wall of the third hole segment at intervals along the axial direction of the first through hole, and a stopping portion provided on the outer wall of the nut seat and located between the first stopping protrusion and the second stopping protrusion. The spindle has a maximum opening position for opening the valve port and a closing position for sealing the valve port. When the spindle moves to the closing position, the first stopping protrusion abuts against the stopping portion. When the spindle moves to the maximum opening position, the second stopping protrusion abuts against the stopping portion. With such a design, the range of the up and down movement of the spindle is determined, avoiding the situation that the ascending displacement of the spindle is too high and the volume of the valve body becomes too large, and also avoiding the impact on the valve port when the spindle descends and damaging the spindle or the valve port, thereby improving the service life of the electronic expansion valve.

Brief Description of the Drawings

[0016] The drawings in the specification forming a part of this application are for providing a further understanding of this application. The schematic embodiments and their descriptions of this application are for interpreting this application and do not inappropriately limit this application.

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0018] Here, the above drawings include the following reference numerals. 10 Valve housing, 11 Accommodation chamber, 12 Valve port, 20 Spindle, 21 First end of the spindle, 22 Second end of the spindle, 23 First guide segment, 24 Thread segment, 25 Second guide segment, 26 Third guide segment, 30 Nut seat, 31 First through hole, 311 First guide hole segment, 312 Thread hole segment, 313 Second guide hole segment, 314 First hole segment, 32 Vent hole, 40 Magnetic rotor, 50 Connection plate, 60 Stopper, 61 Third through hole, 611 Second hole segment, 612 Third hole segment, 71 First stop projection, 72 Second stop projection, 73 Stop portion.

Mode for Carrying Out the Invention

[0019] Hereinafter, with reference to the drawings in the embodiments of this application, the technical aspects in the embodiments of this application will be described clearly and completely. However, it is obvious that the described embodiments are only some of the embodiments of this application, not all of them. Hereinafter, the description of at least one exemplary embodiment is actually only illustrative and does not impose any limitation on this application and its application or use. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of this application.

[0020] As shown in FIGS. 1 to 4, an embodiment of the present application provides an electronic expansion valve including a valve housing 10, a spindle 20, and a nut seat 30. The valve housing 10 has a receiving chamber 11 and a valve port 12, and the receiving chamber 11 communicates with the valve port 12. The spindle 20 has a first end and a second end provided opposite to each other. By sealing or opening the second end 22 of the spindle, the flow rate of the fluid flowing through the valve port 12 can be controlled. The spindle 20 includes a first guide segment 23, a threaded segment 24, and a second guide segment 25 provided in sequence. The first guide segment 23 is provided close to the first end 21 of the spindle, and the second guide segment 25 is provided close to the second end 22 of the spindle. The nut seat 30 is provided in the receiving chamber 11 and fixedly connected to the valve housing 10. A first through hole 31 including a first guide hole segment 311, a threaded hole segment 312, and a second guide hole segment 313 provided in sequence in the nut seat 30 is provided. The spindle 20 is inserted into the first through hole 31. The first guide hole segment 311 is engaged with and guided by the first guide segment 23, the threaded hole segment 312 is screwed with the threaded segment 24, and the second guide hole segment 313 is engaged with and guided by the second guide segment 25. The threaded hole segment 312 is screwed with the threaded segment 24 to rotate the spindle 20 around the nut seat 30 and move the spindle 20 axially along the nut seat 30. The first guide hole segment 311 is engaged with and guided by the first guide segment 23, and the second guide hole segment 313 is engaged with and guided by the second guide segment 25, so that the spindle 20 is maintained to be coaxially provided with the valve port 12 during the movement process.

[0021] When the technical aspect of the present application is applied, by engaging the first guide hole segment 311 with the first guide segment 23 to guide it and providing the first guide segment 23 close to the first end 21 of the spindle, the spindle 20, particularly the part close to the first end 21 of the spindle, can be guided. And by engaging the second guide hole segment 313 with the second guide segment 25 to guide it and providing the second guide segment 25 close to the second end 22 of the spindle, the part of the spindle 20 close to the second end 22 of the spindle can be guided. By engaging the guide structures at both ends of the spindle, a relatively high coaxiality between the spindle 20 and the valve port 12 can be maintained, thereby improving the control accuracy of the entire electronic expansion valve.

[0022] Specifically, the first guide hole segment 311 is clearance - fitted to the first guide segment 23, and the second guide hole segment 313 is clearance - fitted to the second guide segment 25. In this way, the stable movement of the spindle 20 is ensured, the guiding effect on the spindle 20 is ensured, and the coaxiality between the spindle 20 and the valve port 12 can be further improved. Optionally, the range of the possible value of the gap between the first guide hole segment 311 and the first guide segment 23 is 0.05 mm to 0.1 mm, so that the first guide hole segment 311 is engaged with the first guide segment 23 to exert a relatively good guiding action on the spindle 20, and when the spindle 20 moves, the movement resistance between the first guide segment 23 and the first guide hole segment 311 is relatively small. Optionally, the range of the possible value of the gap between the second guide hole segment 313 and the second guide segment 25 is 0.01 mm to 0.09 mm, so that a relatively good guiding action is exerted on the spindle 20, and when the spindle 20 moves, the movement resistance between the second guide hole segment 313 and the second guide segment 25 is relatively small.

[0023] Specifically, the diameter of the first guide segment 23 is larger than the diameter of the threaded segment 24, and the diameter of the threaded segment 24 is larger than the diameter of the second guide segment 25. Further, the diameter of the second guide segment 25 is larger than the diameter of the end portion of the second end 22 of the spindle. With such a design, it becomes easy to attach the spindle 20 into the first through hole 31 from above the first through hole 31. Thus, after fixing the nut seat 30 to the valve housing 10, the spindle 20 can be attached, facilitating the assembly of the electronic expansion valve and improving the attachment efficiency. In other embodiments, the diameter of the first guide segment 23 may be smaller than the diameter of the threaded segment 24, the diameter of the threaded segment 24 may be smaller than the diameter of the second guide segment 25, and the spindle 20 may be attached into the first through hole 31 from below the first through hole 31.

[0024] In this embodiment, the nut seat 30 is provided with a vent hole 32 communicating with the first through hole 31. By providing the vent hole 32, the air pressure inside the first through hole 31 and inside the accommodation chamber 11 can be equalized. Further, the resistance to the spindle 20 caused by the pressure difference can be removed or reduced, so that the spindle 20 can move smoothly within the nut seat 30.

[0025] In this embodiment, a first hole segment 314 is provided between the threaded hole segment 312 and the second guide hole segment 313. The inner diameter of the first hole segment 314 is larger than the inner diameter of the second guide hole segment 313 and smaller than the inner diameter of the threaded hole segment 312. The vent hole 32 is provided on the side wall of the first hole segment 314. With the above structure, the second guide segment 25 of the valve core 20 is provided within the first hole segment 314, and there is a relatively large gap between the first hole segment 314 and the second guide segment 25. Therefore, the ventilation effect of the vent hole 32 is relatively good, and furthermore, the air pressure inside the first through hole 31 and inside the accommodation chamber 11 can be equalized relatively well. In other embodiments, the vent hole 32 may be provided on the side wall of the second guide hole segment 313 or the threaded hole segment 312.

[0026] In this embodiment, the spindle 20 further includes a third guide segment 26 provided on a side away from the screw segment 24 of the first guide segment 23. The electronic expansion valve further includes a magnetic rotor 40 provided in the accommodation chamber 11 and fixedly connected to the third guide segment 26. When the magnetic rotor 40 rotates, the third guide segment 26 and the spindle 20 are rotated in conjunction, so that the spindle 20 is rotated relative to the nut seat 30 and moved along the axial direction.

[0027] Specifically, the diameter of the third guide segment 26 is smaller than the diameter of the first guide segment 23. By doing so, not only can other structures be avoided and interference between the third guide segment 26 and other structures of the electronic expansion valve be prevented, but also the structure of the electronic expansion valve can be made compact and the volume can be reduced.

[0028] In this embodiment, the electronic expansion valve further includes a connection plate 50. The connection plate 50 is provided in the magnetic rotor 40, and the outer peripheral edge is fixedly connected to the magnetic rotor 40. A second through hole is provided in the connection plate 50. The second through hole and the first through hole 31 are coaxially provided. The third guide segment 26 is inserted into the second through hole and fixedly connected to the inner wall of the second through hole. By providing the connection plate 50, the connection stability between the third guide segment 26 and the magnetic rotor 40 is enhanced. The connection plate 50 may be provided integrally with the magnetic rotor 40 or may be fixedly connected to the third guide segment 26 by welding.

[0029] As shown in FIG. 5, in this embodiment, the electronic expansion valve further includes a stopper 60, and a fixing structure is provided between the stopper 60 and the nut seat 30. The upper surface of the stopper 60 is fixedly connected to the bottom surface of the connection plate 50. A third through hole 61 is provided in the stopper 60. The third through hole 61 includes a second hole segment 611 and a third hole segment 612 that communicate with each other. The inner diameter of the second hole segment 611 is smaller than the inner diameter of the third hole segment 612. A third guide segment 26 is inserted into the third through hole 61, and the third guide segment 26 and the second hole segment 611 are in transitional fit. The third through hole 61 of the stopper 60 and the second through hole are coaxially provided. Since the third guide segment 26 and the second hole segment 611 are in transitional fit, the second hole segment 611 can guide the third guide segment 26 to further improve the coaxiality between the spindle 20 and the valve port 12.

[0030] Specifically, the stopping structure includes a first stopping protrusion 71, a second stopping protrusion 72, and a stopping portion 73. The first stopping protrusion 71 and the second stopping protrusion 72 are provided on the inner wall of the third hole segment 612 at intervals along the axial direction of the first through hole 31. The stopping portion 73 is provided on the outer wall of the nut seat 30 and is located between the first stopping protrusion 71 and the second stopping protrusion 72. The spindle 20 has a maximum opening position for opening the valve port 12 and a closed position for sealing the valve port 12. When the spindle 20 moves to the closed position, the first stopping protrusion 71 abuts against the stopping portion 73. When the spindle 20 moves to the maximum opening position, the second stopping protrusion 72 abuts against the stopping portion 73. In this embodiment, the first stopping protrusion 71 is located above the second stopping protrusion 72, and the stopping portion 73 is provided on the outer wall of the nut seat 30. When the stopping portion 73 abuts against the first stopping protrusion 71, the spindle 20 moves to the lowest position to seal the valve port 12 and prevent fluid from passing through. When the stopping portion 73 abuts against the second stopping protrusion 72, the spindle 20 moves to the highest position, and the opening degree between the spindle 20 and the valve port 12 becomes the largest. With such a design, the range of the up and down movement of the spindle 20 is determined, avoiding the situation where the ascending displacement of the spindle 20 is too high and the volume of the valve body becomes excessive, and also avoiding the impact on the valve port 12 when the spindle 20 descends and damaging the spindle 20 or the valve port 12, thereby improving the service life of the electronic expansion valve.

[0031] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless clearly indicated otherwise in the context, the singular form is also intended to include the plural form. Further, in this specification, when the terms "comprising" and / or "including" are used, it should also be understood that they mean the presence of features, steps, operations, devices, assemblies, and / or combinations thereof.

[0032] Unless otherwise specifically described, the relative arrangements, mathematical formulas, and numerical values of the members and steps described in these embodiments do not limit the scope of this application. At the same time, for the convenience of description, it should be understood that the dimensions of each part shown in the drawings are not drawn in actual proportional relationships. Although detailed descriptions of technologies, methods, and devices already known to those skilled in the art may be omitted, if necessary, the said technologies, methods, and devices should be regarded as part of the approved specification. In all the examples shown and described herein, any specific values are merely illustrative and should not be construed as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that for similar reference signs and characters, in order to represent similar ones in the following drawings, once a certain one is defined in one drawing, there is no need to further explain it in subsequent drawings.

[0033] In the description of this application, the orientation or positional relationship expressed by orientation terms such as "front, rear, upper, lower, left, right", "lateral direction, longitudinal direction, vertical, horizontal", and "top, bottom" generally is based on the orientation or positional relationship shown in the drawings. However, they are only for facilitating and simplifying the description of this application. In the absence of a contrary description, these orientation terms do not indicate and imply that the indicated device or element necessarily has a specific orientation or is configured and operated in a specific orientation. Therefore, they should not be understood as limiting the protection scope of this application. The orientation term "inside, outside" refers to the inside and outside with respect to the contour of each member itself.

[0034] For the sake of convenience in description, here, spatial relative terms such as "above...", "above...", "on the upper surface of...", "upper" etc. are used to describe the spatial positional relationship between one device or feature and another device or feature as shown in the figure. It should be understood that the spatial relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figure of the device. For example, if the device in the drawing is turned upside down, a device described as "above another device or structure" or "on another device or structure" will then be positioned as "below another device or structure" or "under another device or structure". Thus, the exemplary term "above..." can include two orientations, namely "above..." and "below...". This device can also be positioned in other different ways (rotated 90 degrees or positioned in other orientations), and corresponding interpretations can be made for the spatial relative descriptions used here.

[0035] Furthermore, it should be noted that the use of terms such as "first", "second" etc. to limit components is only for distinguishing the corresponding components, and unless otherwise specified, these terms have no special meaning and should not be understood as limiting the protection scope of this application.

[0036] What is described above is only a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, various modifications and changes are possible to this application. Any modifications, equivalent replacements, improvements, etc. made within the scope of the spirit and principle of this application should be included within the protection scope of this application.

Claims

1. A valve housing (10) having a receiving chamber (11) and a valve port (12), wherein the receiving chamber (11) communicates with the valve port (12); A spindle (20) having a first end and a second end provided opposite to each other, wherein the second end (22) seals or opens the valve port (12), and includes a first guide segment (23), a screw segment (24), and a second guide segment (25) provided in sequence. The first guide segment (23) is provided close to the first end (21) of the spindle, and the second guide segment (25) is provided close to the second end (22) of the spindle. The spindle (20); A first through hole (31) provided in the receiving chamber (11) and fixedly connected to the valve housing (10), and including a first guide hole segment (311), a screw hole segment (312), and a second guide hole segment (313) provided in sequence. The spindle (20) is inserted into the first through hole (31), the first guide hole segment (311) is engaged with and guided by the first guide segment (23), the screw hole segment (312) is screwed with the screw segment (24), and the second guide hole segment (313) is engaged with and guided by the second guide segment (25). A nut seat (30); The nut seat (30) is provided with a vent hole (32) communicating with the first through hole (31); A first hole segment (314) is provided between the screw hole segment (312) and the second guide hole segment (313). The inner diameter of the first hole segment (314) is larger than the inner diameter of the second guide hole segment (313) and smaller than the inner diameter of the screw hole segment (312). The vent hole (32) is provided on the side wall of the first hole segment (314). An electronic expansion valve.

2. The electronic expansion valve according to claim 1, wherein the first guide hole segment (311) and the first guide segment (23) are clearance-fitted, and the second guide hole segment (313) and the second guide segment (25) are clearance-fitted.

3. The electronic expansion valve according to claim 1, wherein the diameter of the first guide segment (23) is larger than the diameter of the screw segment (24), and the diameter of the screw segment (24) is larger than the diameter of the second guide segment (25).

4. A valve housing (10) having a receiving chamber (11) and a valve port (12), wherein the receiving chamber (11) communicates with the valve port (12), A spindle (20) having a first end and a second end provided opposite to each other, wherein the second end (22) seals or opens the valve port (12), and includes a first guide segment (23), a thread segment (24), and a second guide segment (25) provided in sequence, the first guide segment (23) is provided close to the first end (21) of the spindle, and the second guide segment (25) is provided close to the second end (22) of the spindle, the spindle (20); A first through hole (31) provided in the receiving chamber (11) and fixedly connected to the valve housing (10), and including a first guide hole segment (311), a thread hole segment (312), and a second guide hole segment (313) provided in sequence, the spindle (20) is inserted into the first through hole (31), the first guide hole segment (311) is engaged with and guided by the first guide segment (23), the thread hole segment (312) is screwed with the thread segment (24), and the second guide hole segment (313) is engaged with and guided by the second guide segment (25), a nut seat (30); The spindle (20) further includes a third guide segment (26) provided on a side of the first guide segment (23) away from the thread segment (24); Further including a magnetic rotor (40) provided in the receiving chamber (11) and fixedly connected to the third guide segment (26); Further including a connection plate (50), the connection plate (50) is provided in the magnetic rotor (40), an outer peripheral edge thereof is fixedly connected to the magnetic rotor (40), a second through hole is provided in the connection plate (50), the second through hole and the first through hole (31) are coaxially provided, the third guide segment (26) is inserted into the second through hole and fixedly connected to an inner wall of the second through hole, Further comprising a stopper (60), a fixing structure is provided between the stopper (60) and the nut seat (30), the upper surface of the stopper (60) is fixedly connected to the bottom surface of the connection plate (50), and a third through hole (61) is provided in the stopper (60). The third through hole (61) includes a second hole segment (611) and a third hole segment (612) that communicate with each other. The inner diameter of the second hole segment (611) is smaller than the inner diameter of the third hole segment (612). The third guide segment (26) is inserted into the third through hole (61), and the third guide segment (26) and the second hole segment (611) are in transitional fit. Electronic expansion valve.

5. The electronic expansion valve according to claim 4, wherein the diameter of the third guide segment is smaller than the diameter of the first guide segment.

6. The fixing structure includes a first stopper protrusion (71) and a second stopper protrusion (72) provided on the inner wall of the third hole segment (612) at intervals along the axial direction of the first through hole (31), a stopper portion (73) provided on the outer wall of the nut seat (30) and located between the first stopper protrusion (71) and the second stopper protrusion (72), The spindle (20) has a maximum opening position for opening the valve port (12) and a closed position for closing the valve port (12). When the spindle (20) moves to the closed position, the first stopper protrusion (71) abuts against the stopper portion (73). When the spindle (20) moves to the maximum opening position, the second stopper protrusion (72) abuts against the stopper portion (73). The electronic expansion valve according to claim 4.

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