Electronic Expansion Valve

Abstract

An electronic expansion valve comprising: a valve core assembly; and a valve seat (10) having a chamber, the valve core assembly being movably disposed within the chamber, the valve seat (10) being provided with a valve port (20), the valve port (20) including a first cylindrical segment (21) and a plurality of transition segments connected in sequence, the first cylindrical segment (21) being provided adjacent to the valve core assembly, each transition segment having an opposite leading end and an end, the leading end of the transition segment being provided adjacent to the valve core assembly, the leading end of the transition segment being provided adjacent to the valve core assembly, the leading end of the transition segment being connected to the first cylindrical segment (21) having a diameter equal to the diameter of the first cylindrical segment (21) and the leading end of each transition segment being smaller than the diameter of the end of the corresponding transition segment, and the leading end of the adjacent transition segment being adjacent to the valve core assembly having a diameter equal to the leading end of the transition segment separated from the valve core assembly. By adopting this technical aspect, the problem of fluid forming a vortex at the valve port in the prior art is solved.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the China National Intellectual Property Office on January 26, 2022, bearing application number 202220236777.8 and entitled "Electronic Expansion Valve."

[0002] TECHNICAL FIELD This application relates to the technical field of valves, and in particular to electronic expansion valves. [Background technology]

[0003] In the prior art, the valve port of the electronic expansion valve includes a number of flow segments connected to each other, and generally, the diameters at the connection points of adjacent flow segments are different, that is, the connection points of the flow segments have step surfaces. In actual use, when the fluid flows from the valve chamber to the valve port, vortices are easily formed at the valve port, which increases the noise of the flow, and the vortices increase the flow resistance of the fluid and reduce the flow speed of the fluid. Summary of the Invention

[0004] The present application provides an electronic expansion valve to solve the problem of fluid forming vortex at the valve port in the prior art.

[0005] The present application provides an electronic expansion valve, comprising: a valve core assembly; and a valve seat having an accommodation chamber, the valve core assembly being movably disposed within the accommodation chamber, the valve seat being provided with a valve port, the valve port including a first cylindrical segment and a plurality of transition segments which are connected in sequence, the first cylindrical segment being provided adjacent to the valve core assembly, each transition segment having an opposite leading end and an end, the leading end of the transition segment being provided adjacent to the valve core assembly, the leading end of the transition segment being connected to the first cylindrical segment among the plurality of transition segments has a diameter equal to the diameter of the first cylindrical segment and a diameter of the leading end of each transition segment being smaller than a diameter of the end of the corresponding transition segment, and the leading end of the adjacent transition segment being a diameter equal to a diameter of the leading end of the transition segment away from the valve core assembly.

[0006] When the technical aspects of the present application are applied, a plurality of transition segments are provided between the first cylindrical segment and the second cylindrical segment, the diameter of the tip of each transition segment is smaller than the diameter of the terminal end of the corresponding transition segment, and the diameters of the end portions of the connecting ends of two adjacent transition segments are the same, thereby eliminating the step surface and allowing the flow rate of the fluid to change gradually when flowing through the valve orifice, and further allowing the fluid to flow more gently, thereby reducing the noise of the fluid flowing.

[0007] Moreover, the valve orifice further includes a second cylindrical segment, the second cylindrical segment being connected to an end of the transition segment remote from the valve core assembly, and a diameter of an end of the transition segment connected to the second cylindrical segment among the plurality of transition segments is the same as a diameter of the second cylindrical segment.

[0008] Furthermore, each transition segment is a tapered segment, and the taper angle of the plurality of transition segments gradually decreases in a direction away from the valve core assembly. By making the transition segments tapered segments and making the side walls of the transition segments smooth, the flow velocity of the fluid passing through the transition segments can be gradually changed, and noise and flow resistance of the fluid flow can be further reduced.

[0009] Furthermore, the plurality of transition segments includes a first tapered segment, the first tapered segment is connected to the first cylindrical segment, and the first tapered segment has a taper angle α, where 180°>α>90°. By making 180°>α>90°, it is possible to prevent the fluid from forming a vortex at an end of the first cylindrical segment away from the valve core assembly, and also to reduce the overall length of the valve orifice.

[0010] Furthermore, the diameter of the first cylindrical segment is d, the diameter of the end of the first tapered segment is d1, and 4d ≧ d1 ≧ 1.1d is satisfied. By satisfying 4d ≧ d1 ≧ 1.1d, the flow speed of the fluid in the valve port can be made to change uniformly, the fluid can flow smoothly, and noise caused by the fluid can be reduced.

[0011] Furthermore, the plurality of transition segments includes a second tapered segment, the second tapered segment being disposed at one end of the first tapered segment remote from the valve core assembly, and the second tapered segment has a taper angle β, where 50°>β≧25°. By setting 50°>β≧25°, the overall length of the valve orifice can be reduced, and fluid noise can also be reduced.

[0012] Furthermore, the length of the first cylindrical segment is L, and 5 mm>L≧0.5 mm is satisfied. By satisfying 5 mm>L≧0.5 mm, the valve core assembly can seal the first cylindrical segment well, and the overall volume of the valve seat can be reduced.

[0013] Furthermore, a connecting protrusion is provided at the bottom of the valve seat, some of the valve ports pass through the connecting protrusion, and the difference between the inner diameter and the outer diameter of the end of the connecting protrusion remote from the valve port is A, which satisfies 0.8mm≧A≧0.3mm. By satisfying 0.8mm≧A≧0.3mm, the structural strength of the connecting protrusion can be improved, and vortexes can be prevented from being generated in the fluid at the end face of the connecting protrusion.

[0014] In addition, the electronic expansion valve further includes a connecting pipe, the connecting pipe is fitted to the outside of the connecting protrusion, and a welding gap is provided between the end of the connecting protrusion and the inner wall of the connecting pipe. By providing the welding gap, the inner wall of the connecting pipe and the outer wall of the connecting protrusion can be easily welded.

[0015] Furthermore, a fluid opening is provided on the side surface of the valve seat, and the fluid opening is in communication with the accommodation chamber. The fluid opening and the valve port serve as an inlet and an outlet for the fluid, respectively. [Brief description of the drawings]

[0016] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0017] [Figure 1] FIG. 1 shows a schematic diagram of an electronic expansion valve provided by the present application. [Diagram 2] FIG. 1 shows a schematic diagram of an electronic expansion valve provided by the present application. [Diagram 3] FIG. 2 shows a schematic diagram of the fluid flow direction of the electronic expansion valve provided by the present application.

[0018] Here, the above drawings include the following reference numbers: 10 valve seat, 11 fluid opening, 20 valve port, 21 first cylindrical segment, 22 second cylindrical segment, 23 first tapered segment, 24 second tapered segment, 30 protrusion, 40 connecting pipe, 50 weld gap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are merely some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is actually merely explanatory, and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0020] As shown in Fig. 1 to Fig. 3, an embodiment of the present application provides an electronic expansion valve including a valve core assembly and a valve seat 10. The valve seat 10 has a receiving chamber, the valve core assembly is movably disposed in the receiving chamber, and the valve seat 10 is provided with a valve port 20, and the valve port 20 includes a first cylindrical segment 21 and a plurality of transition segments connected in sequence, the first cylindrical segment 21 is disposed adjacent to the valve core assembly, each transition segment has a leading end and an end disposed opposite to each other, the leading end of the transition segment is disposed adjacent to the valve core assembly, the leading end of the transition segment connected to the first cylindrical segment 21 among the plurality of transition segments has the same diameter as the diameter of the first cylindrical segment 21, and the leading end of each transition segment is smaller than the leading end diameter of the corresponding transition segment, and the leading end of the transition segment adjacent to the valve core assembly among the adjacent transition segments has the same diameter as the leading end of the transition segment separated from the valve core assembly. The valve port 20 can be sealed or opened by installing the valve core assembly. The arrows in Fig. 3 are schematic diagrams showing the flow of fluid in the valve port 20. The electronic expansion valve further includes a valve housing connected to the valve seat 10 and having a receiving chamber between the valve seat 10 and the valve housing.

[0021] When the technical aspects of the present application are applied, the valve port 20 includes a first cylindrical segment 21 and a plurality of transition segments which are connected in sequence, the diameter of the tip of the transition segment connected to the first cylindrical segment 21 is the same as the diameter of the first cylindrical segment 21, the diameter of the tip of each transition segment is smaller than the diameter of the terminal end of this transition segment, and the diameters of the connecting ends of two adjacent transition segments are the same, thereby eliminating the step surface and allowing the flow speed of the fluid flowing through the valve port to change gradually, and further allowing the fluid to flow more gently, thereby reducing the noise of the fluid flowing.

[0022] In this embodiment, the valve orifice further includes a second cylindrical segment 22, which is connected to one end of the transition segment remote from the valve core assembly, and the end of the transition segment connected to the second cylindrical segment 22 among the plurality of transition segments has the same diameter as the diameter of the second cylindrical segment 22. By providing the second cylindrical segment 22, the length of the valve orifice can be extended, which makes it easier to connect other structures to the valve orifice.

[0023] Specifically, by making the diameter of the tip of the transition segment connected to the first cylindrical segment 21 the same as the diameter of the first cylindrical segment 21, it is possible to avoid a step surface between the first cylindrical segment 21 and the transition segment, and to prevent the fluid from forming an eddy at the connection between the first cylindrical segment 21 and the transition segment, thereby further reducing the flow resistance of the fluid and reducing noise. By making the diameter of the end of the transition segment connected to the second cylindrical segment 22 the same as the diameter of the second cylindrical segment 22, it is possible to avoid a step surface between the transition segment and the second cylindrical segment 22, and to prevent the fluid from forming an eddy at the connection between the transition segment and the second cylindrical segment 22, thereby further reducing the flow resistance of the fluid and reducing noise. By making the diameter of the end of the transition segment close to the valve core assembly and the diameter of the tip of the transition segment away from the valve core assembly the same among the adjacent transition segments, it is possible to avoid the fluid from forming an eddy at the connection between the adjacent transition segments, thereby reducing the flow resistance of the fluid and reducing noise.

[0024] Here, the sidewall of the transition segment may be an inclined surface or a circular arc surface. In this embodiment, each transition segment is a tapered segment, and the taper angle of the transition segments gradually decreases in the direction away from the valve core assembly. The transition segments are provided as tapered segments, and the sidewalls of the transition segments are smooth, so that the flow speed of the fluid changes gradually when the fluid flows through the transition segments, and the noise and flow resistance of the fluid flow are further reduced. The taper angles of the transition segments gradually decrease in the direction away from the valve core assembly, so that the rate at which the cross-sectional area of ​​the inner walls of the transition segments increases gradually slows in the direction away from the valve core assembly, so that the fluid flows gently in the valve orifice, and the noise of the fluid flow is further reduced.

[0025] As shown in Fig. 2, the plurality of transition segments includes a first taper segment 23, which is connected to a first cylindrical segment 21, and the taper angle of the first taper segment 23 is α, which is 180°>α>90°. If α is 180°, the first taper segment 23 is not conical, and the fluid will form a vortex at the end of the first cylindrical segment 21 away from the valve core assembly, which will increase the fluid noise and flow resistance. If α≦90°, the change rate of the cross-sectional area from the tip to the end of the first taper segment 23 is slow, and the taper angle of the transition segment at the end of the first taper segment 23 away from the valve core assembly is too small, so the length of each transition segment needs to be increased to meet the structural design of the valve orifice 20, which will increase the overall length of the valve orifice 20. Therefore, by making 180°>α>90°, it is possible to prevent the fluid from forming a vortex at the end of the first cylindrical segment 21 away from the valve core assembly, and to reduce the overall length of the valve orifice 20. In this embodiment, α may be set to 100°, 120°, 140°, or 170°.

[0026] In this embodiment, the diameter of the first cylindrical segment 21 is d, the diameter of the end of the first tapered segment 23 is d1, and 4d≧d1≧1.1d. If d1<1.1d, the difference between the diameter of the end of the first tapered segment 23 and the diameter of the first cylindrical segment 21 is small, and the length of the first tapered segment 23 is short, so the length of the other transition segments needs to be long, which leads to a non-uniform increase rate of the cross-sectional area of ​​the transition segments in the direction away from the valve core assembly, and furthermore, the change in the flow rate of the fluid is non-uniform. If d1>4d, the difference between the diameter of the end of the first tapered segment 23 and the diameter of the second cylindrical segment 22 is small, so the length of the second tapered segment 24 and the other transition segments is short, which leads to a non-uniform increase rate of the cross-sectional area of ​​the transition segments in the direction away from the valve core assembly, and furthermore, the change in the flow rate of the fluid is non-uniform. Therefore, by making 4d≧d1≧1.1d, the flow speed of the fluid in the valve port 20 can be made to change uniformly, the fluid can flow gently, and noise caused by the fluid can be reduced. Specifically, in this embodiment, d1=1.1d, d1=2d, or d1=4d may be satisfied.

[0027] In this embodiment, the plurality of transition segments includes a second taper segment 24, which is disposed at one end of the first taper segment 23 away from the valve core assembly, and the taper angle of the second taper segment 24 is β, and 50°>β≧25°. If β is smaller than 25°, the length of the second taper segment 24 is long, so that the overall length of the valve orifice 20 is increased, and the volume of the valve seat 10 is increased. If β≧50°, the taper angles of the other transition segments are all large, so that the lengths of the transition segments are all short, which causes the rate of change of the cross-sectional area of ​​the plurality of transition segments to increase, and further the change in the flow rate of the fluid to increase, and the noise of the fluid to increase. Therefore, by making 50°>β≧25°, the overall length of the valve orifice 20 can be reduced, and the noise of the fluid can also be reduced. Specifically, in this embodiment, β may be 25°, 35°, or 45°.

[0028] Specifically, the length of the first cylindrical segment 21 is L, and 5mm>L≧0.5mm. If L<0.5mm, the area of ​​engagement between the inner wall of the first cylindrical segment 21 and the valve core assembly is small, so that the effect of the valve core assembly sealing the first cylindrical segment 21 is reduced. If L≧5mm, the length of the first cylindrical segment 21 is long, so that the overall length of the valve port 20 is long, and the overall volume of the valve seat 10 is also large, so that the space occupied by the electronic expansion valve is increased. Therefore, by making 5mm>L≧0.5mm, the valve core assembly can effectively seal the first cylindrical segment 21, and the overall volume of the valve seat 10 can also be reduced. Specifically, in this embodiment, L may be 0.5mm, 2mm, or 4.5mm.

[0029] In this embodiment, the connection protrusion 30 is provided at the bottom of the valve seat 10, and some of the valve ports 20 penetrate the connection protrusion 30, and the difference between the inner diameter and the outer diameter of the end of the connection protrusion 30 away from the valve port 20 is A, which is 0.8 mm ≧ A ≧ 0.3 mm. If A < 0.3 mm, the thickness of the end of the connection protrusion 30 away from the valve port 20 is too small, so the strength of the connection protrusion 30 is low. If A is larger than 0.8 mm, the structural dimensions of the end face of the connection protrusion 30 away from the valve port 20 are large, so that vortexes are easily generated in the fluid at the end face of the connection protrusion 30, which increases the flow resistance of the fluid and increases the noise. Therefore, by making 0.8 mm ≧ A ≧ 0.3 mm, the structural strength of the connection protrusion 30 can be improved and vortexes can be avoided from being generated in the fluid at the end face of the connection protrusion 30. Specifically, in this embodiment, A may be 0.3 mm, 0.5 mm, or 0.8 mm.

[0030] In this embodiment, the electronic expansion valve further includes a connecting pipe 40, which is fitted onto the outside of the connecting protrusion 30, and has a welding gap 50 between the end of the connecting protrusion 30 and the inner wall of the connecting pipe 40. After the fluid flows through the valve port 20, it enters the connecting pipe 40. By providing the welding gap 50, the inner wall of the connecting pipe 40 and the outer wall of the connecting protrusion 30 can be easily welded together.

[0031] Specifically, a fluid opening 11 is provided on the side surface of the valve seat 10, and the fluid opening 11 is connected to the storage chamber. The fluid opening 11 and the valve port 20 serve as an inlet and an outlet for the fluid, respectively.

[0032] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and further, when the terms "comprise" and / or "comprise" are used herein, it is to be understood that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0033] Unless otherwise specifically described, the relative arrangement of the components and steps, the formulas and values ​​described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for convenience of description, the dimensions of each part shown in the drawings are not drawn in actual proportion. Detailed descriptions of techniques, methods and equipment already known to those skilled in the art may be omitted, but the techniques, methods and equipment should be considered as part of the approved specification, as necessary. In all examples shown and described herein, any specific values ​​should be interpreted as being merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, there is no need to further describe it in the subsequent drawings.

[0034] In the description of this application, orientations or positional relationships expressed by orientation terms such as "front, back, up, down, left, right", "lateral, longitudinal, vertical, horizontal", "top, bottom", etc. are generally based on the orientations or positional relationships shown in the drawings, but this is merely for the ease and simplicity of the description of this application, and unless otherwise stated, these orientation terms do not indicate or imply that the devices or elements shown necessarily have a specific orientation or are constructed and operated in a specific orientation, and should not be understood as limiting the scope of protection of this application, and orientation terms such as "inside, outside" are inside and outside with respect to the contour of each member itself.

[0035] For ease of description, spatially relative terms such as "above," "upper," "on top of," "above," and the like may be used herein to describe the spatial location of one device or feature relative to another device or feature as depicted in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figures of the device. For example, if a device in the figures is turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can include two orientations: "above" and "below." The device can also be positioned in other different ways (rotated 90 degrees or positioned in other orientations) and a corresponding interpretation made of the spatially relative descriptions used herein.

[0036] It should be further explained that the use of terms such as "first", "second", etc. to define parts is merely intended to distinguish corresponding parts, and unless otherwise specified, the above terms have no special meaning and should not be understood as limiting the scope of protection of the present application.

[0037] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. a valve core assembly; 1. An electronic expansion valve comprising: a valve seat (10) having a chamber, the valve core assembly being movably disposed within the chamber, the valve seat (10) being provided with a valve port (20), the valve port (20) including a first cylindrical segment (21) and a plurality of transition segments connected in series, the first cylindrical segment (21) being provided adjacent to the valve core assembly, each of the transition segments having an opposite leading end and an end, the leading end of the transition segment being provided adjacent to the valve core assembly, a leading end diameter of the transition segment connected to the first cylindrical segment (21) among the plurality of transition segments is the same as a leading end diameter of the first cylindrical segment (21), and a leading end diameter of each of the transition segments is smaller than a leading end diameter of the corresponding transition segment, and a leading end diameter of the adjacent transition segment among the adjacent transition segments is the same as a leading end diameter of the transition segment separated from the valve core assembly.

2. 2. The electronic expansion valve according to claim 1, wherein the valve port further comprises a second cylindrical segment (22), the second cylindrical segment (22) is connected to one end of the transition segment remote from the valve core assembly, and a diameter of an end of the transition segment connected to the second cylindrical segment (22) among the plurality of transition segments is the same as a diameter of the second cylindrical segment (22).

3. 2. The electronic expansion valve of claim 1, wherein the transition segments are tapered segments, and a taper angle of the transition segments gradually decreases in a direction away from the valve core assembly.

4. 2. The electronic expansion valve of claim 1, wherein the plurality of transition segments includes a first tapered segment (23), the first tapered segment (23) is connected to the first cylindrical segment (21), and the first tapered segment (23) has a taper angle α, where 180°>α>90°.

5. 5. The electronic expansion valve of claim 4, wherein the first cylindrical segment (21) has a diameter d and the first tapered segment (23) has an end diameter d1, where 4d>d1>1.1d.

6. 2. The electronic expansion valve of claim 1, wherein the plurality of transition segments includes a second tapered segment (24), the second tapered segment (24) being provided at one end of the first tapered segment (23) away from the valve core assembly, and the second tapered segment (24) has a taper angle β, where 50°>β≧25°.

7. 2. The electronic expansion valve of claim 1, wherein the first cylindrical segment (21) has a length L, and 5 mm>L≧0.5 mm.

8. 2. The electronic expansion valve according to claim 1, wherein a connecting protrusion (30) is provided on a bottom of the valve seat (10), a part of the valve port (20) penetrates the connecting protrusion (30), and a difference between an inner diameter and an outer diameter of an end of the connecting protrusion (30) remote from the valve port (20) is A, and 0.8 mm≧A≧0.3 mm.

9. 9. The electronic expansion valve according to claim 8, further comprising a connecting pipe (40), the connecting pipe (40) being fitted onto the outside of the connecting protrusion (30) and having a weld gap (50) between an end of the connecting protrusion (30) and an inner wall of the connecting pipe (40).

10. 2. The electronic expansion valve according to claim 1, wherein a fluid opening (11) is provided on a side surface of the valve seat (10), and the fluid opening (11) is connected to the storage chamber.

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