Electric valve

Abstract

To provide a motor-operated valve capable of coping with a high-pressure refrigerant by improving rigidity (pressure resistance) of a can without changing a shape and a height of a can top surface.SOLUTION: In a motor-operated valve including: a valve main body 12 having, in the inside, a valve chamber 13 and an orifice 16 and further having a first flow passage 14 and a second flow passage 15 communicated with the valve chamber; a valve element 17 moving forward and backward to the orifice for changing a flow rate of a fluid; a bottomed open-top can 19 communicated with the valve chamber and housing a rotor 27 of a motor 21 for driving the valve element; and a bearing member 29 disposed on an upper portion of the rotor inside the can and rotatably supporting the rotor, wherein the bearing member has a plurality of joint portions brought into contact with an inner surface of a top plate portion 19d of the can and joined to the inner surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electric valve, and more particularly to a reinforcement structure of a can (sealed container) that houses a rotor of an electric motor.

Background Art

[0002] An electric valve that adjusts the opening degree of a valve using an electric motor such as a stepping motor and controls the flow rate of a refrigerant has been conventionally used in a refrigeration cycle device equipped with a refrigerant circuit such as an air conditioner or a refrigerating / freezing device.

[0003] FIG. 7 shows an example of such an electric valve. As shown in the figure, the electric valve 41 includes a valve body 12 having a valve chamber 13 and an orifice 16 inside, and a first flow path pipe 14 and a second flow path pipe 15 connected to the valve chamber 13 and communicating therewith; a valve element 17 that moves forward and backward (vertically) with respect to the orifice 16 to change the flow rate of a fluid; a can 19 that forms a sealed space above the valve body 12; an electric motor 21 that drives the valve element 17; a speed reduction mechanism 31 that reduces the rotation of the electric motor 21; and a transmission mechanism 32 that converts the rotation reduced by the speed reduction mechanism 31 into a linear motion and transmits it to the valve element 17. The electric motor 21 has a rotor 27 and a stator 22. The rotor 27 is housed in the can 19 and is rotatably supported by a support shaft member 28 and a bearing member (upper bearing member) 42. The stator 22 is covered with a resin mold cover 26 and is disposed outside (outer circumference) of the can 19.

[0004] Further, the lower end of the can 19 is fixed by welding to a stepped portion 12c at the upper part of the valve body via a ring-shaped base plate 18. The internal space of the can 19 communicates with the valve chamber 13, and a refrigerant flows into the can 19.

[0005] In addition, the following patent documents disclose such electric valves.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-6577 [Patent Document 2] Japanese Patent Publication No. 2007-211814 [Patent Document 3] Japanese Patent Publication No. 2008-101633 [Patent Document 4] Japanese Patent Publication No. 2012-197849 [Overview of the project] [Problems that the invention aims to solve]

[0007] Incidentally, in recent years, the use of CO2 refrigerants has been promoted from the perspective of reducing environmental impact.

[0008] However, CO2 refrigerants have a higher operating pressure compared to conventional fluorocarbon refrigerants, and using high-pressure refrigerants like CO2 requires high strength (rigidity) in the can. For this reason, conventionally, as shown in Figure 8, the thickness of the lower end (welded part) 54b of the can 54 was increased, and the top surface 54a was made spherical to make it difficult to deform, thereby meeting the strength requirements. The reason for increasing the thickness of the lower end 54b is to reinforce this area, as the lower end (welded part) becomes a fulcrum during elastic deformation, causing stress concentration.

[0009] However, making the top surface 54a spherical increases the height of the can 54 (increases the length in the direction of axis A), which has the drawback of making the electric valve 51 larger (taller). Also, because the top surface 54a of the can 54 protrudes upward, the conventional stator 22 shown in Figure 7 cannot be used, and a dedicated stator 52 (equipped with a resin molded cover 53 of a different shape) must be prepared, which increases manufacturing costs.

[0010] Therefore, the objective of the present invention is to improve the rigidity (pressure resistance) of the can without changing the shape or height of the can top surface, and to enable it to handle high-pressure refrigerants. [Means for solving the problem]

[0011] To solve the aforementioned problems and achieve the objective, the electric valve according to the present invention comprises a valve body having a valve chamber and an orifice inside and connected to a first flow path and a second flow path communicating with the valve chamber; a valve element that moves back and forth relative to the orifice to change the flow rate of fluid passing through the orifice; a can that communicates with the valve chamber and houses the rotor of an electric motor that drives the valve element; and a bearing member that is positioned above the rotor inside the can and rotatably supports the rotor, wherein the bearing member has a plurality of joints that are in contact with and joined to the inner surface of the top plate portion of the can.

[0012] Furthermore, the bearing member described above is ,B The bearing has a main body portion into which a support shaft member that rotatably supports the data is fitted, a flange portion that protrudes outward from the main body portion, and a rib that rises from the upper surface of the flange portion toward the top plate portion of the can, with the flange portion in contact with the inner circumferential surface of the can and the aforementioned joint portion formed on the rib.

[0013] In the electric valve of the present invention, the can is reinforced by utilizing a bearing member provided in the upper part (ceiling) of the inside of the can. Specifically, the bearing member is configured to contact the inner surface of the top plate of the can, and multiple points of the bearing member that are in contact with the inner surface are joined to the inner surface of the top plate of the can, thereby suppressing deformation of the can and improving the pressure resistance strength of the can.

[0014] Here, the "top panel" of a can refers to the part that covers the top of a can that is bottomless and lidded (i.e., the bottom is open and the top is closed), but to be more precise, it is as follows:

[0015] The can has a cylindrical portion with a constant diameter, including the portion interposed between the rotor and the stator, and a reduced-diameter portion whose diameter gradually decreases to close the top surface. The reduced-diameter portion may include curved plate portions with curved inner and outer surfaces, and may include multiple curved plate portions with different curvatures. In addition to curved plate portions, the reduced-diameter portion may also include flat plate portions with flat inner and outer surfaces.

[0016] On the other hand, deformation of the can top surface due to high-pressure refrigerant occurs when the top surface bulges upward, with the boundary between the cylindrical part and the reduced-diameter part (the ring-shaped outer edge portion of the reduced-diameter part that extends upward and inward following the upper end of the cylindrical part), or in other words, the ring-shaped corner portion that forms the outer edge of the can top surface, acting as a fulcrum. Therefore, in this invention, the portion inside and above the boundary portion (corner portion) is referred to as the "top plate portion," and by joining a bearing member to this top plate portion, deformation of the can (top plate portion) is suppressed, and the pressure resistance strength of the can is improved.

[0017] In addition, the terms "inside" and "inner" above refer to the side closer to the central axis of the can. Furthermore, in this application, the axial direction of the electric valve (valve body) and the can is defined as the "up and down direction," with one side of this up and down direction (the direction from the valve body toward the can) being defined as "up," and the other side of this up and down direction (the direction from the can toward the valve body) being defined as "down." Based on this concept of "up" and "down," terms related to up and down, such as "upward," "downward," "upper part," "lower part," "upper side," and "lower side," are used in this application. In addition, since the electric valve of the present invention can be used in various orientations, "down" is not necessarily the direction of gravity and "up" is not necessarily the direction opposite to gravity.

[0018] The bearing member and the inner surface of the can top plate are joined by welding, and in particular, electric resistance welding is preferred because it provides a joint strength that can be maintained even by repeated elastic deformation due to temperature changes and pressure fluctuations. However, this joining is not limited to welding, and other methods (e.g., brazing) are also possible.

[0019] Furthermore, it is preferable that the joints in the present invention be formed in a rotationally symmetrical position. This is to ensure that a uniform load is applied to the can top plate (each joint) when the inside of the can becomes high pressure.

[0020] Furthermore, it is preferable that the flange portion has an opening that penetrates axially. This is to prevent differential pressure from occurring between the upper and lower sides of the bearing member.

[0021] The advantages of the present invention are as follows.

[0022] While maintaining the conventional shape (for example, the shape shown in FIG. 7), it is possible to improve the strength (rigidity) of the cam. Therefore, it is possible to cope with high-pressure refrigerants without causing an increase in the size of the electric valve (elongation of the cam). In addition, the stator can be shared between an electric valve using a conventional refrigerant such as a fluorocarbon refrigerant and an electric valve corresponding to a high-pressure refrigerant such as CO2 refrigerant, and an increase in cost for coping with high-pressure refrigerants can be suppressed.

Effect of the Invention

[0023] According to the present invention, it is possible to improve the pressure resistance of the cam without changing the shape and height of the top plate portion of the cam, and it is possible to cope with high-pressure refrigerants.

[0024] Other objects, features, and advantages of the present invention will be clarified by the following description of the embodiments of the present invention based on the drawings. Note that the present invention is not limited to the following embodiments, and it is obvious to those skilled in the art that various changes can be made within the scope described in the claims. Also, in each figure, the same reference numerals indicate the same or corresponding parts.

Brief Description of the Drawings

[0025] [Figure 1] FIG. 1 is a longitudinal sectional view showing an electric valve (closed state) according to an embodiment of the present invention. [Figure 2] FIG. 2 is a longitudinal sectional view showing the electric valve (open state) according to the embodiment. [Figure 3] FIG. 3 is a plan view showing a bearing member provided in the electric valve according to the embodiment. [Figure 4] FIG. 4 is a longitudinal sectional view (section B-B in FIG. 3) showing a bearing member provided in the electric valve according to the embodiment. [Figure 5] FIG. 5 is a plan view showing another bearing member provided in the electric valve according to the embodiment. [Figure 6]Figure 6 is a longitudinal cross-sectional view (CC section in Figure 5) showing another bearing member provided in the electric valve according to the above embodiment. [Figure 7] Figure 7 is a longitudinal cross-sectional view showing an example of a conventional electric valve. [Figure 8] Figure 8 is a longitudinal cross-sectional view showing another example of a conventional electric valve. [Modes for carrying out the invention]

[0026] [First Embodiment] As shown in Figures 1 to 6, an electric valve 11 according to one embodiment of the present invention can be used to adjust the flow rate of refrigerant in a refrigeration cycle device such as a heat pump type heating and cooling system, and comprises a valve body 12 having a valve chamber 13 and an orifice (valve opening with a valve seat at its upper end) 16 inside, a valve element 17 that is mounted to move back and forth (up and down) relative to the orifice 16, an electric motor 21 that drives the valve element 17, a reduction mechanism 31 that reduces the rotation of the electric motor 21, a transmission mechanism 32 that converts the rotation reduced by the reduction mechanism 31 into linear motion and transmits it to the valve element 17, and a can (sealed container) 19 that forms a sealed space at the top of the valve body 12.

[0027] The valve body 12 has a main body portion 12a that forms a valve chamber 13, and a cylindrical connecting portion 12b that extends upward from the upper end of the main body portion 12a and allows connection of the electric motor 21 (can 19). An orifice 16 is formed on the bottom upper surface of the main body portion 12a, and a first flow path pipe 14 is connected to the bottom surface of the main body portion 12a so as to communicate with the valve chamber 13 via the orifice 16. In addition, a second flow path pipe 15 is connected to the side surface of the main body portion 12a so as to communicate with the valve chamber 13. In this embodiment, the first flow path pipe 14 is used as the inlet passage for the refrigerant and the second flow path pipe 15 is used as the outlet passage for the refrigerant, but it is also possible to use the second flow path pipe 15 as the inlet passage and the first flow path pipe 14 as the outlet passage.

[0028] The connecting portion 12b has a smaller outer diameter than the main body portion 12a. Therefore, a stepped portion 12c is formed at the boundary between the main body portion 12a and the connecting portion 12b on the outer circumferential surface of the valve body 12. The lower end of the can 19 is joined (welded) to this stepped portion 12c via a ring-shaped base plate 18, integrating the can 19 and the valve body 12. The lower end of the can 19, which is the joining portion, is made into a thickened portion 19e to increase its pressure resistance.

[0029] The can 19 is a cylindrical member with no bottom and a lid (open bottom and closed top) formed by press-forming a conductive metal plate (e.g., stainless steel plate), and has a cylindrical portion 19a with a constant inner diameter and a reduced-diameter portion 19b whose inner diameter gradually decreases to close the top. The reduced-diameter portion 19b has a corner portion 19c which is a ring-shaped part that extends upward and inward from the upper end of the cylindrical portion 19a, and a disc-shaped top plate portion 19d (can ceiling portion 19d) which extends inside the corner portion 19c and completely closes the top of the can 19. The corner portion 19c, which is the part connecting the cylindrical portion 19a and the top plate portion 19d, has a larger curvature (smaller radius of curvature) than the top plate portion 19d in order to keep the height of the can 19 low.

[0030] The top plate portion 19d is the part that extends in a perfect circle when viewed from a plane, centered on the central axis A of the can 19, that is, at the center of the can's top surface. If we express this range (size of the top plate portion 19d) numerically, with the inner diameter of the can 19 (cylindrical portion 19a) being r (see Figure 1), in this embodiment, the part within a range of 0.95r centered on the central axis A of the can 19 is defined as the "top plate portion". The upper bearing member 29 (described in detail later) is then joined to the inner surface of this range (top plate portion 19d).

[0031] In this embodiment, the electric motor 21 that drives the valve body 17 is a stepping motor. This stepping motor 21 consists of a stator 22 installed on the outside (outer circumference) of the can 19 and a rotor 27 rotatably installed on the inside (inner circumference) of the can 19.

[0032] The stator 22 includes a yoke 23, a coil 25 with windings wound on a bobbin 24, and a resin molded cover 26 that covers the yoke 23 and the coil 25.

[0033] Meanwhile, the rotor 27 is rotatably supported by a round rod-shaped support shaft member 28 that extends vertically through the center of the can 19 along the central axis A. The lower end of the support shaft member 28 is fitted to the upper part of the output shaft 33 (described later), which outputs the rotation of the rotor 27, so as to be able to rotate relative to it, and the upper end is supported by an upper bearing member 29. This upper bearing member 29 corresponds to the bearing member as referred to in the present invention.

[0034] The upper bearing member 29 (see also Figures 3 and 4) has a cylindrical bearing body portion 29a into which the upper end of the support shaft member 28 is fitted and fixed, a disc-shaped flange portion 29b that extends horizontally outward from the lower end of the bearing body portion 29a, and four ribs 29c that rise vertically upward from the upper surface of the flange portion 29b and extend radially in all directions from the outer circumferential surface of the bearing body portion 29a, and is made of a conductive metal material (for example, stainless steel). In addition, an opening 29e that penetrates axially is provided in the flange portion 29b between the ribs 29c, so that differential pressure does not occur on the upper and lower sides of the upper bearing member 29.

[0035] Here, the flange portion 29b has an outer diameter approximately the same as the inner diameter of the can 19 (cylindrical portion 19a), and the outer circumferential surface of the flange portion 29b abuts against the upper inner circumferential surface of the cylindrical portion 19a of the can 19. Each rib 29c has a projection 29d with a hemispherical cross-sectional shape that protrudes upward at the outer end of its upper surface, and these projections 29d abut against the inner surface of the can top plate portion 19d. These projections 29d are joined to the inner surface of the can top plate portion 19d. This joining is performed by resistance welding, in which an electric current is passed through the contact area between the two base materials (the can top plate portion 19d and the projection 29d of the upper bearing member 29) while pressing the projections 29d against the inner surface of the can top plate portion 19d. Furthermore, this resistance welding is performed by pulse welding, which supplies a pulsed current as the welding current. This is to obtain strong joint strength through deep penetration.

[0036] In this embodiment, by firmly joining the projection 29d of the upper bearing member 29 to the top plate portion 19d, the structure becomes such that the top portion 19d is less likely to deform even when the inside of the can becomes under high pressure, thereby improving the strength of the can. Furthermore, by joining the projection 29d and the top plate portion 19d with the outer circumferential surface of the flange portion 29b in contact with the upper inner circumferential surface of the cylindrical portion 19a, the function of suppressing axial runout and tilting of the support shaft member 28 is improved. In other words, horizontal displacement of the rotor 27 and contact between the rotor 27 and the inner wall of the can can be suppressed.

[0037] Inside the rotor 27, the reduction mechanism 31 is equipped with a unique planetary gear mechanism that has a high reduction ratio and is advantageous for miniaturization. The rotation of the rotor 27 is reduced by the reduction mechanism 31 and transmitted to an output shaft 33 located at the center of the lower surface of the rotor 27, from which output is produced.

[0038] A cylindrical lower bearing member 34 is positioned at the bottom of the rotor 27, and this lower bearing member 34 rotatably supports the output shaft 33. The lower bearing member 34 is fitted and fixed within the connection portion 12b of the valve body 12.

[0039] An insertion hole 34a is formed in the center of the upper surface of the lower bearing member 34, and the output shaft 33 is rotatably inserted into this insertion hole 34a. On the other hand, a female threaded portion 34b is formed in the lower center of the lower bearing member 34, and a male threaded portion 35a formed on the outer circumferential surface of the screw drive member 35 is screwed into this female threaded portion 34b. These lower bearing member 34 (female threaded portion 34b) and screw drive member 35 (male threaded portion 35a) form a feed screw mechanism and constitute the transmission mechanism 32 that converts the rotational motion supplied from the stepping motor 21 via the reduction mechanism 31 into vertical linear motion and transmits it to the valve body 17.

[0040] Here, the rotor 27 and output shaft 33 rotate without moving up or down at a fixed position in the vertical direction. The rotational motion of the rotor 27 (output shaft 33) is transmitted to the screw drive member 35 by inserting the flat screwdriver-shaped plate portion 35b provided at the upper end of the screw drive member 35 into the slit-shaped fitting groove 33a provided at the lower end of the output shaft 33. As the plate portion 35b provided on the screw drive member 35 slides vertically within the fitting groove 33a of the output shaft 33, the screw drive member 35 moves linearly vertically due to the screw feed mechanism 32, even though the output shaft 33 does not move vertically when the rotor 27 rotates.

[0041] The linear motion of the screw drive member 35 is transmitted to the valve body 17 via a ball-shaped joint 36 consisting of a ball 36a and a ball seat 36b. The valve body 17 is a cylindrical member having a needle-shaped (inverted cone-shaped) tip at its lower end that moves toward and toward the orifice (valve seat) 16, and has a flange portion 17a that protrudes horizontally outward at its upper end. A fitting hole 17b is formed on the upper surface of the valve body 17, and the ball seat 36b is fitted into this fitting hole 17b.

[0042] Furthermore, the valve chamber 13 is provided with a stepped cylindrical valve body guide member 37. This valve body guide member 37 consists of a guide portion 37a with a small diameter (inner and outer diameter) formed at its lower end, a ring-shaped flange portion 37c that extends horizontally outward from its upper end, and a large-diameter portion 37b with a large diameter (inner and outer diameter) formed in the middle portion (between the guide portion 37a and the flange portion 37c). The guide portion 37a supports the valve body 17 so that it can slide up and down. The large-diameter portion 37b has an outer diameter approximately equal to the inner diameter of the main body portion 12a (valve chamber 13) of the valve body 12, and is fitted into the valve chamber 13 in a nested manner and fixed so as to be in close contact with the inner circumferential surface of the valve chamber 13. The flange portion 37c is positioned to rest on a stepped portion 12d formed at the lower end of the inner circumferential surface of the connection portion 12b of the valve body 12, and is sandwiched between the stepped portion 12d and the lower bearing member 34, thereby preventing vertical displacement of the valve body guide member 37. In addition, a stepped portion 37d is formed on the inner circumferential surface of the valve body guide member 37 between the large diameter portion 37b and the guide portion 37a.

[0043] Furthermore, a compression coil spring 38 is provided inside the large-diameter portion 37b, or more specifically, in the gap between the outer circumferential surface of the valve body 17 and the inner circumferential surface of the large-diameter portion 37b. This compression coil spring 38 is installed in a compressed state between the flange portion 17a of the valve body 17 and the stepped portion 37d of the valve body guide member 37, thereby biasing the valve body 17 upward (in the valve opening direction). By applying the biasing force of the compression coil spring 38 to the valve body 17 in addition to the driving force of the electric motor 21 during the valve opening operation, the valve opening operation is made more reliable.

[0044] In this embodiment, the central axis A of the valve body 12 (body portion 12a and connecting portion 12b), can 19, orifice 16, valve element 17, ball joint 36, support shaft member 28, upper bearing member 29 and lower bearing member 34, as well as the central axis (rotation axis) A of the rotor 27, output shaft 33 and screw drive member 35, coincide with each other.

[0045] Figures 5 and 6 show another example of the configuration of the upper bearing member. This upper bearing member 39 has a bearing body portion 39a and a flange portion 39b similar to the upper bearing member 29, but instead of the ribs 29c that extend radially in all four directions, it is equipped with a ring-shaped rib 39c that extends in a perfect circle around the central axis A. The ring-shaped rib 39c rises vertically upward from the upper surface of the flange portion 39b, and its upper end abuts against the inner surface of the can top plate portion 19d. When using this upper bearing member 39, multiple points of the rib 39c can be joined to the inner surface of the can top plate portion 19d by welding, similar to the upper bearing member 29. Although Figure 5 shows four joining points 39d, the number of joining points 39d can be, for example, three or five or more. It is desirable that the multiple joining points 39d be in rotationally symmetrical positions.

[0046] The operation of the electric valve 11 according to this embodiment will be described.

[0047] When current is supplied to the stator 22 (coil 25) so that the rotor 27 rotates in one direction from the closed valve state shown in Figure 1, the rotation of the rotor 27 is reduced by the reduction mechanism 31, then converted into linear motion by the lead screw mechanism 32, and the screw drive member 35 is pulled upward. Accordingly, the valve body 17, which is pressed against the lower surface of the screw drive member 35 via the ball joint 36 by the biasing force of the compression coil spring 38, is pulled upward and the valve body 17 separates from the orifice (valve seat) 16, resulting in an open valve state where the refrigerant that has flowed in through the first flow path pipe 14 flows out through the valve chamber 13 and out from the second flow path pipe 15 (see arrow F in Figure 2). The amount of refrigerant that passes through in this open valve state (refrigerant flow rate) can be adjusted by the amount of rotation of the rotor 27 (distance between the orifice 16 and the valve body 17).

[0048] On the other hand, when current is supplied to the stator 22 (coil 25) so that the rotor 27 rotates in the opposite direction to the one direction described above from the open valve state, the rotation of the rotor 27 is converted into linear motion by the lead screw mechanism 32, and the screw drive member 35 moves downward. Along with this downward movement, the valve body 17 moves downward, and when the valve body 17 comes into contact with the orifice 16, the flow path between the first flow path pipe 14 and the second flow path pipe 15 is blocked, resulting in a closed valve state (see Figure 1). [Explanation of symbols]

[0049] A Center axis 11,41,51 Electric valve 12 Valve body 12a Main body of the valve body 12b Connection part of the valve body 12c Stepped portion on the outer surface of the valve body 12d Stepped portion on the inner surface of the valve body 13 valve chambers 14. First flow channel pipe (inflow channel) 15. Second flow channel (outlet channel) 16. Orifice (valve opening with valve seat) 17 Valve body 17a Flange portion of the valve body 17b Fitting hole 18 Base Plate 19,54 Can 19a Cylindrical part of the can 19b Reduced diameter section of the can 19c Corner of the can 19d Can top panel 19e, 54b Lower end of the can (thickened section) 19f Can top surface 21. Electric motor (stepping motor) 22.52 status 23 York 24 bobbins 25 coils 26,53 Resin molded cover 27 Rotors 28 Support shaft member 29,39,42 Upper bearing member 29a, 39a Bearing body 29b, 39b Flange portion of upper bearing member 29cm, 39cm rib 29d Protrusion 29e,39e opening 31. Reduction mechanism (mysterious planetary gear mechanism) 32 Transmission mechanism (feed screw mechanism) 33 Output shaft 33a Fitting groove 34 Lower bearing member 34a Insertion hole 34b Female thread section 35 Screw drive member 35a Male threaded section 35b Plate-like part 36 Ball joint 36a Ball 36b Ball seat 37 Valve body guide member 37a Guide section 37b Large diameter section 37c Flange portion of valve body guide member 37d Step portion on the inner circumferential surface of the valve body guide member 38 Compression coil spring 39d Joint 54a Top surface of the can

Claims

1. A valve body having a valve chamber and an orifice inside, and connected to a first flow path and a second flow path communicating with the valve chamber, A valve body moves back and forth relative to the orifice, thereby changing the flow rate of the fluid passing through the orifice. A bottomed, open can that communicates with the valve chamber and houses the rotor of the electric motor that drives the valve body, A bearing member is positioned at the top of the rotor inside the can and rotatably supports the rotor, Equipped with, The bearing member has multiple joints that contact and are joined to the inner surface of the top plate portion of the can. It is an electric valve, The bearing member is A bearing body portion into which a support shaft member that rotatably supports the rotor is fitted, The flange portion that protrudes from the bearing body and A rib that rises from the upper surface of the flange portion toward the top plate portion of the can, It has, The flange portion abuts against the inner circumferential surface of the can, The joint portion is formed on the rib. An electric valve characterized by the following features.

2. The joint is formed in a rotationally symmetrical position. The electric valve according to claim 1.

3. The flange portion has an opening that penetrates it in the axial direction. The electric valve according to claim 1.

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