Electric valve

Abstract

The present invention provides an electric valve in which the reduction in fluid flow rate and the rectifying effect of the rectifier plate is suppressed. [Solution] The electric valve 100 comprises a valve body 20 having a main body portion 22A having a valve port 24 leading to a valve chamber 23 and a substantially cylindrical leg portion 22B; a valve element 30 disposed in the valve chamber 23 and capable of opening and closing the valve port 24; a pipe 40 brazed to the leg portion 22B of the valve body 20; and a flow straightening plate 50 disposed inside the pipe 40 and having a plurality of holes 51. A groove portion 22G extending in the circumferential direction into which solder can flow is provided on the outer circumferential surface of the leg portion 22B.

Description

Technical Field

[0001] The present disclosure relates to an electric valve.

Background Art

[0002] Patent Document 1 etc. disclose an electric valve having a structure in which a rectifying plate is brazed to a valve body having a valve seat in an internal space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the brazing process, due to capillary action, the brazing flows too much, blocking the flow path of the rectifying plate, reducing the flow rate of the fluid, and reducing the rectifying effect of the rectifying plate.

[0005] An object of the present disclosure is to provide an electric valve in which a reduction in the flow rate of a fluid and a rectifying effect of a rectifying plate are suppressed.

Means for Solving the Problems

[0006] An electric valve according to one aspect of the present disclosure includes a valve body including a main body portion having a valve port communicating with a valve chamber and a substantially cylindrical leg portion, a valve element disposed in the valve chamber and capable of opening and closing the valve port, a pipe brazed to the leg portion of the valve body, a rectifying plate disposed inside the pipe and having a plurality of holes, and is characterized in that a circumferentially extending groove portion into which brazing can flow is provided on an outer peripheral surface of the leg portion.

Effects of the Invention

[0007] According to this disclosure, it is possible to provide an electric valve in which the reduction in fluid flow rate and the rectifying effect of the rectifier plate is suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a partial cross-sectional view of an electric valve according to an embodiment of the present disclosure. [Figure 2] This is an enlarged view of the cross-sectional view of the electric valve shown in Figure 1. [Figure 3] This is an enlarged view of the cross-sectional view of the electric valve shown in Figure 1. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described below with reference to the drawings. For the sake of clarity, configurations having the same reference numerals as those already described in the description of the embodiments will be omitted from the description. Furthermore, the dimensions of the components shown in these drawings may differ from the actual dimensions of the components for the sake of clarity.

[0010] Figure 1 is a partial cross-sectional view of an electric valve 100 according to an embodiment of the present disclosure. The electric valve 100 comprises a motor 10, a can 13, a valve stem 14, a guide stem 15, a coupling mechanism 16, a valve body 20, a valve element 30, and a pipe 40.

[0011] The motor 10 is, for example, a stepping motor and has a stator 11 and a rotor 12. The stator 11 has multiple coils. The rotor 12 is rotatably arranged inside the stator 11. The rotor 12 is also covered by a can 13. The valve stem 14 is connected to the rotor 12 and is located inside the rotor 12. By supplying a drive current from the control board 17 to the stator 11, the valve stem 14 is rotated together with the rotor 12. As the valve stem 14 rotates, it is simultaneously driven in the central axis direction Y by the screw mechanism of the guide stem 15. When the valve stem 14 is driven in the central axis direction Y, the coupling mechanism 16 and the valve body 30 located below the valve stem 14 also move in conjunction in the central axis direction Y.

[0012] The valve body 20 comprises a main body member 21 and a valve seat member 22. The main body member 21 has a cylindrical shape. The valve seat member 22 has a cylindrical shape with a smaller diameter than the main body member 21. The valve seat member 22 is joined to the lower end of the main body member 21. The valve body 20 has a valve chamber 23 in its internal space. The valve body 20 is connected to an inlet passage 26 extending in the X direction perpendicular to the central axis direction Y, and an outlet passage 27 extending in the central axis direction Y. Both the inlet passage 26 and the outlet passage 27 communicate with the valve chamber 23.

[0013] The valve seat member 22 has a valve port 24 and a valve seat 25. The valve port 24 is a circular hole that penetrates the center of the valve seat member 22 in the central axis direction Y. The valve seat 25 is the upper end portion of the valve port 24 formed in the valve seat member 22. The valve seat 25 is surrounded by an annular rib 29. The rib 29 has the effect of restricting the flow of fluid into the valve port 24 and suppressing the generation of abnormal noise.

[0014] The valve body 30 is driven in the central axis direction Y to seat on or separate from the valve seat 25, thereby opening and closing the outflow passage 27. Therefore, when the valve body 30 is open, the fluid flowing in from the inflow passage 26 flows out to the outflow passage 27 via the valve chamber 23, and when the valve body 30 is closed, it remains in the valve chamber 23 without flowing out to the outflow passage 27.

[0015] Figure 2 is an enlarged cross-sectional view of the electric valve 100 shown in Figure 1. As shown in Figure 2, the valve seat member 22 of the valve body 20 has a main body portion 22A having a valve port 24 leading to the valve chamber 23, and a substantially cylindrical leg portion 22B. The leg portion 22B and the main body portion 22A are brazed together within the expanded section of a substantially cylindrical pipe 40. A flow straightening plate 50 is positioned inside the expanded section of the pipe 40, below the leg portion 22B. The flow straightening plate 50 is a disc having a diameter approximately the same as the outer diameter of the leg portion 22B and has a plurality of holes 51 penetrating in the central axis direction Y. The flow straightening plate 50 has a flow straightening effect that subdivides air bubbles in the fluid flowing from the valve chamber 23 to the outflow passage 27, thereby reducing flow noise. The valve body 30 is positioned in the valve chamber 23 and opens and closes the valve port 24 and the outflow passage 27 by seating on or separating from the valve seat 25.

[0016] In the brazing process of brazing the pipe 40 to the leg portion 22B and the main body portion 22A, the molten brazing in the furnace flows from the brazing inlet 28 into the gap between the pipe 40 and the main body portion 22A or the leg portion 22B.

[0017] In the present embodiment, a groove portion 22G extending in the circumferential direction is provided on the outer peripheral surface of the leg portion 22B. In the brazing process, a part of the brazing can flow into the groove portion 22G. In this way, by allowing a part of the brazing to flow into the groove portion 22G, the inflow of the brazing into the plurality of holes 51 of the flow rectifying plate 50 can be suppressed, and the reduction of the flow rate of the fluid and the rectifying effect of the flow rectifying plate 50 can be prevented.

[0018] That is, according to the present disclosure, it is possible to eliminate the occurrence of problems caused by the brazing overflowing from the gap at the lower end of the leg portion 22B through the upper surface of the flow rectifying plate 50 and entering the plurality of holes 51 and blocking the plurality of holes 51.

[0019] The valve body 20 and the flow rectifying plate 50 may be made of different materials. Also, the wettability of the flow rectifying plate 50 may be higher than the wettability of the valve body 20. For example, when the flowing brazing is formed of a material containing phosphorus bronze brazing, the valve body 20 may be formed of a material containing SUS (Steel Use Stainless), and the flow rectifying plate 50 may be formed of a material containing brass. Also, when the flowing brazing is formed of a material containing silver brazing, the valve body 20 may be formed of a material containing brass, and the flow rectifying plate 50 may be formed of a material containing SUS. Thereby, even when the brazing overflows from the gap at the lower end of the leg portion 22B, since the wettability of the flow rectifying plate 50 with respect to the brazing is low, the inflow of the brazing into the plurality of holes 51 of the flow rectifying plate 50 can be suppressed. Note that the wettability represents the magnitude of the contact angle, which is the angle formed between the surface of the flow rectifying plate 50 and the brazing flowing on the surface. A high wettability indicates a large contact angle, and a low wettability indicates a small contact angle.

[0020] The pipe 40 may have an enlarged pipe portion 41 where the upper end side of the pipe material is enlarged and processed, and a tapered portion T having a tapered shape with a smaller diameter below the enlarged pipe portion 41. With this configuration, the flow rectifying plate 50 abuts against the tapered portion T of the pipe 40 (see FIG. 3), the contact area between the flow rectifying plate 50 and the pipe 40 is small, and the contact pressure is large. Therefore, it is possible to suppress the rotation and rattling of the flow rectifying plate 50 due to the flow of the fluid and the differential pressure generated before and after the flow rectifying plate.

[0021] In addition, in the present embodiment, the upper end of the pipe 40 does not abut against the bottom surface of the main body portion 22A of the valve seat member 22, and the pipe 40 and the valve seat member 22 are fixed with a gap therebetween, thereby ensuring the abutment between the flow rectifying plate 50 and the tapered portion T.

[0022] The groove portion 22G may be provided on the lower end side of the outer peripheral surface of the leg portion 22B. Further, the radial depth D of the groove portion 22G perpendicular to the central axis direction Y may be larger than the width L parallel to the central axis direction Y. With this configuration, the fixing strength of the pipe 40 brazed to the leg portion 22B or the main body portion 22A can be improved.

[0023] FIG. 3 is an enlarged view of the cross-sectional view of the electric valve 100 shown in FIG. 1 and is a further enlarged view of the cross-sectional view shown in FIG. 2. As shown in FIG. 3, the electric valve 100 includes a brazing arrangement portion 6 at the periphery outside the brazing inlet 28. A brazing ring is placed on the brazing arrangement portion 6 at the initial stage of the brazing process. The brazing ring is a brazing material having a ring shape.

[0024] In the brazing process, by melting the brazing ring, the brazing flows into the gap (first clearance C1) between the pipe 40 and the main body portion 22A, the gap (second clearance C2) between the pipe 40 and the leg portion 22B, and reaches the lower end of the leg portion 22B. Also, a part of the flowing brazing enters the groove portion 22G.

[0025] Here, the volume of the solder flow path from the solder placement section 60 to the groove section 22G is defined as the first volume V1, the volume of the groove section 22G as the second volume V2, and the volume of the solder ring placed in the solder placement section 60 as the third volume V3. The sum of the first volume V1 and the second volume V2 may be greater than the third volume V3. Also, the second volume V2 may be greater than the third volume V3. This prevents molten solder from flowing below the groove section 22G and suppresses the inflow of solder into the holes 51 of the straightening plate 50.

[0026] While embodiments of this disclosure have been described above, it goes without saying that the technical scope of this disclosure should not be interpreted restrictively by the description of these embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications to the embodiments are possible within the scope of the invention described in the claims. The technical scope of this disclosure should be determined based on the scope of the invention described in the claims and the scope of its equivalents. [Explanation of Symbols]

[0027] 10: Motor 11: Status 12: Rotor 13: Can 14: Valve stem 15: Guide stem 16:Connection mechanism 17: Control board 20: Valve body 21: Main body components 22: Valve seat member 22A: Main body 22B: Legs 22G:Groove 23: Valve chamber 24: Valve opening 25: Alveolar seat 26:Inflow channel 27:Outflow channel 28: Wax inlet 29: Rib 30: Valve body 40: Pipe 41: Pipe expansion section 50: Rectifier plate 51: Hole 60: Wax arrangement section 100: Electric valve

Claims

1. A valve body comprising a main body having a valve opening leading to a valve chamber, and a substantially cylindrical leg portion, A valve body is disposed in the valve chamber and capable of opening and closing the valve port, A pipe brazed to the leg portion of the valve body, A flow straightening plate having multiple holes is placed inside the aforementioned pipe, Equipped with, An electric valve characterized in that a groove extending in the circumferential direction is provided on the outer circumferential surface of the leg portion, into which wax can flow.

2. The electric valve according to claim 1, wherein the valve body and the rectifier plate are made of different materials.

3. The electric valve according to claim 1, wherein the wettability of the rectifier plate is higher than that of the valve body.

4. The electric valve according to claim 1, wherein the pipe has a tapered shape on the outlet side of the rectifier plate.

5. The electric valve further comprises a wax ring arrangement section, A clearance is provided between the valve body and the pipe through which the wax flows. The electric valve according to claim 1, wherein the sum of the first volume of the flow path of the solder from the solder ring arrangement portion to the groove portion and the second volume of the groove portion is greater than the third volume of the solder ring arranged in the solder ring arrangement portion.

6. The electric valve according to claim 5, wherein the second volume is larger than the third volume.

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