Spindle and electronic expansion valve having the same
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO LTD
- Filing Date
- 2022-08-31
- Publication Date
- 2026-05-26
Smart Images
Figure 0007866036000001 
Figure 0007866036000002 
Figure 0007866036000003
Abstract
Description
Technical Field
[0001] This application claims the priority of a patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122114250.6 and the invention title "Spindle and Electronic Expansion Valve Having the Same".
[0002] This application relates to the technical field of valve control, and specifically to a spindle and an electronic expansion valve having the same.
Background Art
[0003] As an electronic control element, the electronic expansion valve is widely applied in the cooling system because of its high precision and the ability to realize the optimal control of the system. In an air-conditioning system, the electronic expansion valve is used to control the refrigerant flow rate. When multiple indoor units of a central air conditioner are not operating simultaneously, the electronic expansion valves of the non-operating indoor units need to maintain a small opening degree to prevent the refrigerant from accumulating at the valve port attachment due to the refrigerant maintaining a flowing state and clogging the valve port. In the prior art, the diameter of the opening segment of the spindle gradually decreases along the direction towards the head portion of the spindle. Generally, there are assembly errors when assembling the electronic expansion valve. Therefore, when the electronic expansion valve maintains a small opening degree, the refrigerant flow rate cannot be accurately controlled, and the refrigerant flow velocity becomes too fast or too slow, affecting the use of the air conditioner.
Summary of the Invention
[0004] This application provides a spindle and an electronic expansion valve having the same to solve the problem that the prior art electronic expansion valve cannot accurately control the refrigerant flow rate when maintaining a small opening degree.
[0005] )]] According to one aspect of this application, a spindle is provided having a connecting end and a sealing end provided opposite to each other, the sealing end including a sealing segment, a first opening segment and a second opening segment sequentially connected along the axial direction, the sealing segment engaging with the valve port to seal the valve port, the cross-sectional area of the sealing segment near the connecting end is larger than the cross-sectional area of the sealing segment away from the connecting end, the cross-sectional area of the second opening segment near the connecting end is larger than the cross-sectional area of the second opening segment away from the connecting end, and the cross-sectional area of the sealing segment away from the connecting end is equal to the cross-sectional area of the second opening segment, and the cross-sectional area of the first opening segment does not change. Since the cross-sectional area of the first opening segment does not change, i.e., the gap between the first opening segment and the valve port does not change, when the first opening segment is positioned at the valve port, the valve opening can be stabilized, i.e., the flow rate can be stabilized even if there is a certain assembly error.
[0006] In the technical aspects of this application, the sealing end includes a sealing segment, a first opening segment, and a second opening segment sequentially connected along the axial direction, the sealing segment being used to seal the valve opening, and the second opening segment being used to adjust the valve opening and further to adjust the flow rate, and the cross-sectional area of the first opening segment not changing, so that even if there are assembly errors when assembling the electronic expansion valve, it is possible to ensure that the gap between the first opening segment and the valve opening does not change, the electronic expansion valve can be stably maintained at a small opening, and furthermore, the flow rate of the refrigerant can be accurately controlled.
[0007] Furthermore, the first opening segment is a cylindrical segment, and the sealing segment is a conical segment. By providing the first opening segment as a cylindrical segment, the structure is simple, its cross-sectional area does not change, and the flow rate of the valve does not change when the first opening segment is at the valve opening.
[0008] Furthermore, the length of the first opening segment is between 0.1 mm and 0.6 mm. This configuration ensures that the length of the first opening segment does not affect the overall length of the valve body, and that the first opening segment remains in the valve opening even if there is an error in the positioning of the valve head.
[0009] Furthermore, the second opening segment includes a plurality of flow segments connected sequentially along the axial direction, wherein at least two of the flow segments have different cross-sectional areas, and the cross-sectional area of the flow segment further from the connection end is smaller than the cross-sectional area of the flow segment closer to the connection end. By providing at least two flow segments with different cross-sectional areas, it is possible to adjust the flow rate by making the valve opening different when different flow segments are at the valve opening.
[0010] Furthermore, the cross-sectional area of the multiple flow segments gradually decreases as you move away from the connection end. As you move away from the connection end, the valve opening increases sequentially when the multiple flow segments are in the valve opening, thereby regulating the flow rate.
[0011] Furthermore, the flow segment is a conical segment, and the taper angle of the flow segment gradually increases in the direction away from the connection end. With this configuration, the electronic expansion valve can achieve the following flow characteristic curve. At small openings, the change in the flow characteristic curve is gradual, satisfying the user's requirement for stable adjustment under low flow rate working conditions, and at large openings, the change in flow rate is relatively large, that is, at large openings, the requirement for a rapid increase in flow rate is met.
[0012] Furthermore, the surface roughness of the first and second opening segments is 1.6 μm or less. In this way, relatively high accuracy in flow rate control can be ensured when the first and second opening segments are in the valve opening.
[0013] Furthermore, the roundness of the first and second opening segments is 0.005 mm or less. This ensures relatively high accuracy in flow rate adjustment when the first and second opening segments are in the valve opening.
[0014] Furthermore, the sealing end further includes a flow guide segment, the flow guide segment is provided on one side adjacent to the connection end of the sealing segment, the sealing segment is connected to the flow guide segment, and the cross-sectional area adjacent to the connection end of the flow guide segment is larger than the cross-sectional area away from the connection end of the flow guide segment.
[0015] According to another aspect of this application, an electronic expansion valve is provided, the electronic expansion valve comprising a spindle as described in the above technical embodiments, the electronic expansion valve having a valve port, the spindle being movably mounted on the valve port, the electronic expansion valve having an operating state and a stopped state, when the electronic expansion valve is in the operating state, the second opening segment of the spindle is located at the valve port, and when the electronic expansion valve is in the stopped state, the sealing segment of the spindle is located at the valve port.
[0016] Furthermore, the gap between the valve opening and the first opening segment is between 0.01 mm and 0.06 mm. This ensures a relatively small flow rate when the first opening segment is at the valve opening. [Brief explanation of the drawing]
[0017] The drawings in the specification, which constitute part of this application, are provided for further understanding of this application, and the schematic embodiments and descriptions thereof are for interpretation purposes only and do not improperly limit this application.
[0018] [Figure 1] A schematic diagram of the spindle structure provided in this application is shown. [Figure 2] The flow characteristic curve diagram corresponding to the spindle provided in this application is shown. [Figure 3] The flow characteristic curve diagram corresponding to a conventional spindle is shown. [Figure 4]A schematic diagram of the structure of the electronic expansion valve provided in this application is shown.
[0019] The above drawing includes the following reference numerals: 10 Spindle, 11 Connecting end, 12 Sealing end, 121 Sealing segment, 122 First opening segment, 123 Second opening segment, 1231 Flow segment, 124 Flow guide segment, 21 Valve port. [Modes for carrying out the invention]
[0020] The technical aspects of the embodiments of this application will be described clearly and completely below with reference to the drawings of the embodiments of this application, although it is clear that the embodiments described are only a selection of embodiments of this application and not all embodiments. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of this application shall all fall within the scope of protection of this application.
[0021] As shown in Figures 1 and 4, embodiments of the present application provide a spindle 10 having opposing connection end 11 and sealing end 12, the sealing end 12 including a sealing segment 121, a first opening segment 122 and a second opening segment 123 connected sequentially along the axial direction, the sealing segment 121 engaging with the valve opening 21 to seal the valve opening 21, the cross-sectional area of the sealing segment 121 near the connection end 11 being greater than the cross-sectional area of the sealing segment 121 away from the connection end 11, the cross-sectional area of the second opening segment 123 near the connection end 11 being greater than the cross-sectional area of the second opening segment 123 away from the connection end 11, and the cross-sectional area of the sealing segment 121 away from the connection end 11 being equal to the cross-sectional area of the second opening segment 123 near the connection end 11, and the cross-sectional area of the first opening segment 122 remaining unchanged. The connecting end 11 is connected to the screw of the electronic expansion valve, which, under the drive of the rotor assembly, engages the spindle 10 to either seal or disengage the valve port 21. When the electronic expansion valve is to be stopped, the coolant inside the electronic expansion valve must be removed and the valve port 21 sealed by the sealing segment 121.
[0022] When the technical solution of the present application is applied, the sealing end 12 includes a sealing segment 121, a first opening segment 122, and a second opening segment 123 that are sequentially connected along the axial direction. The sealing segment 121 is used to seal the valve port 21. The second opening segment 123 is used to adjust the opening degree of the valve and further adjust the flow rate. The cross-sectional area of the first opening segment 122 does not change, that is, the gap between the first opening segment 122 and the valve port 21 is provided so as not to change. When assembling the electronic expansion valve, even if there is an assembly error, it can be ensured that the gap between the first opening segment 122 and the valve port 21 does not change, so that the electronic expansion valve can be stably maintained at a small opening degree, and further the flow rate of the refrigerant can be accurately controlled.
[0023] Specifically, the first opening segment 122 is a cylindrical segment, and the sealing segment 121 is a conical segment. By providing the first opening segment 122 as a cylindrical segment, the structure is simple and its cross-sectional area does not change, and further the opening degree of the valve when the first opening segment 122 is at the valve port 21 can be made not to change. The sealing segment 121 is a conical segment and can be closed in close contact with the valve port 21.
[0024] Specifically, the length of the first opening segment 122 is 0.1 mm or more and 0.6 mm or less. With this arrangement, since the length of the first opening segment 122 is greater than the positioning error of the valve head, even if there is an error in the positioning of the valve head, it can be ensured that the first opening segment 122 is at the valve port 21, and further the stability of the flow rate can be ensured. And since the length of the first opening segment 122 is relatively small, it does not affect the overall length of the valve body. Specifically, the length of the first opening segment 122 may be 0.1 mm, 0.3 mm, 0.45 mm or 0.6 mm.
[0025] In this embodiment, the second opening segment 123 includes a plurality of flow segments 1231 connected in sequence along the axial direction. Among the plurality of flow segments 1231, the cross-sectional areas of at least two flow segments 1231 are different, and the cross-sectional area of the flow segment 1231 far from the connection end 11 is smaller than the cross-sectional area of the flow segment 1231 close to the connection end 11. By providing at least two flow segments 1231 with different cross-sectional areas, that is, different gaps between the flow segment 1231 and the valve port 21, the opening degrees of the valve when different flow segments 1231 are at the valve port 21 can be made different, so that the function of flow rate adjustment can be achieved.
[0026] Specifically, the cross-sectional areas of the plurality of flow segments 1231 gradually decrease in the direction away from the connection end 11. That is, in the direction away from the connection end 11, the opening degrees of the valve when the plurality of flow segments 1231 are at the valve port 21 increase in sequence, and the flow rate is adjusted. When the spindle moves along the direction from the sealing end 12 towards the connection end 11, the flow rate gradually increases.
[0027] Specifically, the plurality of flow segments 1231 are conical segments, and the taper angles of the plurality of flow segments 1231 gradually increase in the direction away from the connection end 11. In the prior art, one end of the spindle that seals the valve port is generally tapered. FIG. 2 shows the flow rate characteristic curve of the spindle provided in this technical aspect, and FIG. 3 shows the flow rate characteristic curve of the conventional spindle. Comparing FIG. 2 and FIG. 3, it can be understood that the spindle provided in this technical aspect enables the electronic expansion valve to achieve the following flow rate characteristic curve. When the opening degree is small, the change in the flow rate characteristic curve is gentle, meeting the user's requirement for stable adjustment under small flow rate working conditions. At the same time, when the opening degree is large, the change in the flow rate characteristic curve is relatively large, and at the same time, when the opening degree is large, the requirement that the flow rate rapidly increases can be achieved. In FIGS. 2 and 3, the abscissa P represents the opening degree of the valve, and the ordinate Q represents the flow rate.
[0028] Specifically, the surface roughness of the first opening segment 122 and the second opening segment 123 is 1.6 μm or less. In this way, relatively high accuracy in flow rate adjustment can be ensured when the first opening segment 122 and the second opening segment 123 are in the valve opening 21. Specifically, the surface roughness of the first opening segment 122 and the second opening segment 123 may be 1 μm, 1.2 μm, or 1.6 μm.
[0029] Specifically, the roundness of the first opening segment 122 and the second opening segment 123 is 0.005 mm or less. Since each flow segment 1231 is a conical segment, the roundness of each flow segment 1231 is 0.005 mm or less. By setting it in this way, it is possible to ensure relatively high accuracy in flow rate adjustment when the first opening segment 122 and the second opening segment 123 are in the valve opening 21. Specifically, the roundness of the first opening segment 122 and the second opening segment 123 may be 0.002 mm, 0.004 mm, or 0.005 mm.
[0030] In this embodiment, the sealing end 12 further includes a flow guide segment 124, the flow guide segment 124 being provided on one side adjacent to the connection end 11 of the sealing segment 121, the sealing segment 121 being connected to the flow guide segment 124, and the cross-sectional area of the flow guide segment 124 adjacent to the connection end 11 being larger than the cross-sectional area of the flow guide segment 124 away from the connection end 11. Selectively, the flow guide segment 124 may be a tapered segment. The flow guide segment 124 is used to guide fluid so that the fluid flows along the spindle 10 to the valve opening 21.
[0031] As shown in Figures 1 and 4, embodiments of the present application further provide an electronic expansion valve comprising a spindle 10 as described in the above technical embodiments, the electronic expansion valve having a valve port 21, the spindle 10 being movably mounted on the valve port 21, the electronic expansion valve having an operating state and a stopped state, when the electronic expansion valve is in the operating state, the second opening segment 123 of the spindle 10 is located on the valve port 21, and when the electronic expansion valve is in the stopped state, the sealing segment 121 or the first opening segment 122 of the spindle is located on the valve port 21. If the electronic expansion valve needs to be stopped for a long period of time and the refrigerant inside it has been discharged, the sealing segment 121 may be configured to seal the valve port 21. When the electronic expansion valve has stopped operating and refrigerant remains inside it, the first opening segment 122 is located on the valve port 21 to ensure that the refrigerant flows and at a very low flow rate, thereby preventing refrigerant from accumulating inside the electronic expansion valve. When the electronic expansion valve is operating, the flow rate is adjusted by ensuring that the second opening segment 123 is at the valve port 21 and by adjusting the position of each flow segment 1231.
[0032] Specifically, the gap between the valve opening 21 and the first opening segment 122 is 0.01 mm or more and 0.06 mm or less. This ensures that there is a relatively small flow rate when the first opening segment 122 is in the valve opening 21.
[0033] In this embodiment of technology, the sealing end 12 includes a sealing segment 121, a first opening segment 122, and a second opening segment 123 connected sequentially along the axial direction. The sealing segment 121 is used to seal the valve port 21, and the second opening segment 123 is used to adjust the valve opening and further adjust the flow rate. The cross-sectional area of the first opening segment 122 does not change, i.e., the gap between the first opening segment 122 and the valve port 21 does not change, thereby stabilizing the valve opening when the first opening segment 122 is in the valve port 21, and further stabilizing the flow rate of the liquid. The flow segments 1231 are conical segments, and the taper angles of the multiple flow segments 1231 gradually increase in the direction away from the connection end 11. This allows the flow characteristic curve to change gradually when the electronic expansion valve is at a small opening, satisfying the requirement for stable adjustment under low flow rate working conditions, while simultaneously satisfying the requirement for a relatively large change in flow rate and a rapid increase in flow rate when the opening is large. The spindle 10 has a simple structure and is easy to manufacture.
[0034] It should be noted that the terminology used herein is solely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments provided herein. Unless otherwise clearly indicated in the context, the singular form is intended to include the plural form, and furthermore, where the terms “include” and / or “contain” are used herein, it should be understood that they also indicate the presence of features, steps, operations, devices, assemblies and / or combinations thereof.
[0035] Unless otherwise specifically stated, the relative arrangements, formulas, and numerical values of the components and steps described in these embodiments do not limit the scope of this application. At the same time, for the sake of descriptive convenience, it should be understood that the dimensions of the parts shown in the drawings are not drawn according to actual proportional relationships. While we do not discuss in detail the art, methods, and equipment known to those skilled in the art, where appropriate, the art, methods, and equipment described should be considered part of the permitted specification. In all the examples shown and discussed herein, any specific values are merely illustrative and should not be interpreted as limiting. Accordingly, other examples in the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar elements in subsequent drawings, and therefore, once an element is defined in one drawing, no further explanation is required for it in subsequent drawings.
[0036] In the description of this application, directions or positional relationships indicated by directional terms such as "front," "back," "up," "down," "left," "right," "lateral," "vertical," "horizontal," and "top" and "bottom" are usually directions or positional relationships based on the illustrations and are merely for the convenience and simplification of the description in this application. Unless otherwise stated, these directional terms do not indicate or imply that the specified device or element has a particular direction or must be configured and operated in a particular direction, and should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" should be understood as meaning inside and outside with respect to the contour of each component itself.
[0037] For convenience of description, spatially relative terms such as "on top of," "above," "on the top surface," and "on the top surface" may be used here to describe the spatial positional relationship between one illustrated device or feature and another device or feature. Spatially relative terms should be understood as intended to include different orientations of the device in use or operation, in addition to the orientation described in the drawing. For example, if the device in the drawing is reversed, a device described as "above another device or structure" or "on top of another device or structure" will subsequently be positioned as "below another device or structure" or "below another device or structure." Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here may be interpreted accordingly.
[0038] Furthermore, it should be explained that the use of words such as "first," "second," etc., to specify parts is simply to easily distinguish corresponding parts, and unless otherwise stated, the aforementioned words do not have any special meaning and should not be understood as limiting the scope of protection of this application.
[0039] The foregoing describes preferred embodiments of this application and is not intended to limit it. Those skilled in the art will know that this application is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the intent and principles of this application should be included within the scope of protection of this application.
Claims
1. A spindle (10) having a connecting end (11) and a sealing end (12) provided opposite to each other, The sealing end (12) includes a sealing segment (121), a first opening segment (122), and a second opening segment (123) that are sequentially connected along the axial direction. The sealing segment (121) engages with the valve opening (21) to seal the valve opening (21), The cross-sectional area of the sealing segment (121) adjacent to the connection end (11) is larger than the cross-sectional area of the sealing segment (121) further away from the connection end (11). The cross-sectional area of the second opening segment (123) adjacent to the connection end (11) is larger than the cross-sectional area of the second opening segment (123) further away from the connection end (11), and The cross-sectional area of the sealing segment (121) away from the connection end (11) is equal to the cross-sectional area of the second opening segment (123) close to the connection end (11). The cross-sectional area of the first opening segment (122) does not change. The gap between the first opening segment (122) and the valve opening (21) does not change. The second opening segment (123) includes three flow segments (1231) connected sequentially along the axial direction. The cross-sectional area of the three distribution segments (1231) gradually decreases in the direction away from the connection end (11). The taper angles of the three distribution segments (1231) gradually increase in the direction away from the connecting end (11). The sealing end (12) further includes a flow guide segment (124), The flow guide segment (124) is provided on one side of the sealing segment (121) that is close to the connection end (11). The sealing segment (121) is connected to the flow guide segment (124), The cross-sectional area of the guide segment (124) adjacent to the connection end (11) is larger than the cross-sectional area of the guide segment (124) further away from the connection end (11), and The cross-sectional area of the flow guide segment (124) away from the connection end (11) is equal to the cross-sectional area of the sealing segment (121) close to the connection end (11). A spindle in which the taper angle of the flow guide segment (124) is different from the taper angle of the sealing segment (121).
2. The first opening segment (122) is a cylindrical segment, The spindle according to claim 1, wherein the sealing segment (121) is a conical segment.
3. The spindle according to claim 1, wherein the length of the first opening segment (122) is 0.1 mm or more and 0.6 mm or less.
4. The spindle according to claim 1, wherein the distribution segment (1231) is a conical segment.
5. The spindle according to claim 1, wherein the surface roughness of the first opening segment (122) and the second opening segment (123) is 1.6 μm or less.
6. The spindle according to claim 1, wherein the roundness of the first opening segment (122) and the second opening segment (123) is 0.005 mm or less.
7. An electronic expansion valve comprising a spindle (10) according to any one of claims 1 to 6 and the valve port (21), and having an operating state and a stopped state, The spindle (10) is movably mounted in the valve opening (21), When the electronic expansion valve is in the operating state, the second opening segment (123) of the spindle (10) is located at the valve port (21). When the electronic expansion valve is in the stopped state, the sealing segment (121) or the first opening segment (122) of the spindle is located at the valve port (21), the electronic expansion valve.
8. The electronic expansion valve according to claim 7, wherein the gap between the valve port (21) and the first opening segment (122) is 0.01 mm or more and 0.06 mm or less.