Motorised valve

Abstract

Provided is an electric valve having a higher waterproof property than conventional electric valves. A stator (52) of an electric valve (10A) according to the present application has a cylindrical shape with one end closed and the other end open. The stator (52) is fitted to the outside of a rotor housing (17) provided in a valve body (11), and a ring-shaped sealing member (58) is sandwiched between a stator facing portion (11D) provided in the valve body (11) and the stator (52) in the axial direction of the valve body (11), thereby restricting water from entering the inside of the stator (52).

Description

TECHNICAL FIELD

[0001] The present application relates to an electric valve in which a front end side is inserted into a valve mounting hole opened in an outer surface of a valve mounting object member and a motor as a driving source is provided at a base end side. BACKGROUND

[0002] Conventionally, as such an electric valve, there is known an electric valve having a rotor housing that houses a rotor of a motor and a cylindrical stator fitted to an outer side of the rotor housing (see, for example, Patent Literature 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2016-65595 Figure 1 , 3 ) SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] With the above-described conventional electric valve, it is required to enhance waterproofness of the motor.

[0008] SOLUTION TO THE PROBLEM

[0009] The application of Technical Solution 1, which is achieved in order to solve the above-described problem, is an electric valve in which a front end side is inserted into a valve mounting hole opened in an outer surface of a valve mounting object member having a flow path inside and a motor as a driving source is provided at a base end side, and the flow rate of a fluid flowing in the flow path can be changed, wherein the electric valve includes: a valve body having a rotor housing that extends in an axial direction of the valve mounting hole and houses a rotor of the motor at a base end side; a cylindrical stator having a bottom at one end and being open at the other end, which is fitted to an outer side of the rotor housing; a stator facing portion that is formed by expanding a position at a middle of the axial direction of the valve body and faces the stator in the axial direction; a cylindrical portion that is integrally provided to the stator and protrudes toward the stator facing portion; and a ring-shaped sealing member that is sandwiched between the stator facing portion and the cylindrical portion in the axial direction and restricts water immersion into an inner side of the stator, and in the valve body, there are included: a first body sleeve having a valve inner flow path that communicates with the flow path; and a second body sleeve that is assembled to an inner side of the first body sleeve, the rotor housing is fixed to a base end portion of the second body sleeve, and a fitting gap between an inner surface of the first body sleeve and an outer surface of the second body sleeve is opened at a facing surface of the stator facing portion that faces the stator and is covered by the sealing member. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1This is a perspective view of the electric valve according to the first embodiment.

[0011] Figure 2 This is a side sectional view of the electric valve.

[0012] Figure 3 It is a side sectional view obtained by enlarging a part of the electric valve.

[0013] Figure 4 This is a side sectional view of the sealing structure at the bottom of the stator.

[0014] Figure 5 This is a three-dimensional view of the stator taken from below.

[0015] Figure 6 This is a side sectional view of the sealing structure in the electric valve of the second embodiment.

[0016] Figure 7 This is a side sectional view of the sealing structure in the electric valve of the third embodiment.

[0017] Figure 8 This is a side sectional view of the sealing structure in the electric valve according to the fourth embodiment.

[0018] Figure 9 This is a side sectional view of the electric valve in variant example (1).

[0019] Figure 10 This is a side sectional view of the electric valve in variant example (2). Detailed Implementation

[0020] [First Implementation Method]

[0021] The following is for reference Figures 1-5 The electric valve 10A of the first embodiment of the present invention will be described. Figure 1 The electric valve 10A shown in this embodiment is an electric valve used by inserting the front end into the valve mounting hole 91 that opens on the outer surface 90A of the valve mounting member 90.

[0022] It should be noted that, in Figure 1 , Figure 2 In this configuration, the valve mounting hole 91 and the axial direction of the electric valve 10A are oriented vertically, but the electric valve 10A can also be used with its axial direction oriented in a direction other than vertically. Furthermore, in the following description, the axial direction of the valve mounting hole 91 will be referred to as "vertical direction J1". Figure 1 , Figure 2 The upper side in the equation is simply called the "upper side", and its opposite side is simply called the "lower side".

[0023] The valve mounting component 90 is a part of a fluid machine and has an internal flow path 92. For example... Figure 2As shown, the valve mounting hole 91 has a stepped portion 91D near the lower end, a large diameter portion 91A is formed at a position above the stepped portion 91D, and a small diameter portion 91B is formed at a position below the stepped portion 91D. Further, the flow path 92 includes a first flow path 92A extending in a downward direction from the small diameter portion 91B and a second flow path 92B extending in a lateral direction from a position near the stepped portion 91D in the large diameter portion 91A. Moreover, a tapered lead-in surface 91G is formed in an opening edge of the valve mounting hole 91 for leading in an O-ring 13E described later into the valve mounting hole 91.

[0024] Note that the valve mounting target member 90 can be exemplified by an air conditioner, a gas stove, a hydraulic machine, or the like as a specific example, but can be any machine as long as it is a fluid machine. Further, the fluid flowing in the flow path 92 can be a gas, a liquid, or an intermediate body of a liquid and a gas like a refrigerant of an air conditioner.

[0025] The electric valve 10A has a valve body 11 extending in an up-down direction J1. The valve body 11 has a flange portion 12 protruding laterally from a position at the middle of the up-down direction J1, and an insertion portion 13 is formed at a position below the flange portion 12 to be inserted into the valve mounting hole 91. The insertion portion 13 has a large diameter portion 13A and a small diameter portion 13B corresponding to the large diameter portion 91A and the small diameter portion 91B of the valve mounting hole 91. Further, O-ring grooves 13C and 13D housing O-rings 13E and 13F are provided at a position near the flange portion 12 of the large diameter portion 13A and at a substantially central portion of the up-down direction J1 of the small diameter portion 13B. Moreover, the small diameter portion 13B of the insertion portion 13 is fitted into the small diameter portion 91B of the valve mounting hole 91, and the large diameter portion 13A of the insertion portion 13 is fitted into the large diameter portion 91A of the valve mounting hole 91.

[0026] Further, the valve body 11 has a valve inner flow path 14 communicating between the first flow path 92A and the second flow path 92B of the valve mounting hole 91 inside the valve body 11. Moreover, a valve spool 16 linearly moving in the up-down direction J1 protrudes to a middle position of the valve inner flow path 14, so that the flow rate of the fluid passing through the valve inner flow path 14 is controlled.

[0027] As a drive source for linearly moving the valve spool 16, a motor 50 is provided at an upper end portion of the electric valve 10A. A rotor 51 of the motor 50 is housed in a rotor housing 17 provided at a position above the flange portion 12 in the valve body 11, and a stator 52 of the motor 50 is fitted to the outside of the rotor housing 17.

[0028] Specifically, the rotor housing 17 is a thin-walled cylindrical structure extending in the up-down direction, and the upper end portion thereof is plugged by a cap 17A. The valve body 11 is formed by fixing the lower end portion of the rotor housing 17 to the upper end portion of a valve body main portion 18.

[0029] The valve body main body 18 is structured such that the second main sleeve 25 is assembled inside the first main sleeve 21, and the third main sleeve 26 is assembled inside the second main sleeve 25 thereof.

[0030] The first main sleeve 21 has the flange portion 12 and the insertion portion 13 described above. As shown in Figure 1 the flange portion 12 is, for example, in a circular plate shape and extends sideways from the upper end portion of the first main sleeve 21, and the outer diameter of the flange portion 12 is larger than the outer diameter of the stator 52. Further, in the range of the flange portion 12 that is outside the outer diameter of the stator 52, a plurality of mounting holes 12L that pass through in the up-down direction J1 are provided at positions that are circumferentially equally divided, and a threaded hole 12N for fixing the stator 52 to the valve body 11 is provided. Further, as shown in Figure 4 the upper surface of the flange portion 12, a step portion 12Z is provided such that the inner edge portion protrudes in a stepped manner, and the corner between the side surface of the step portion 12Z and the upper surface of the flange portion 12 that is outside the step portion 12Z is chamfered. Note that the flange portion 12 is not limited to a circular shape, and can be an elliptical shape, a polygonal shape, or the like. Further, the mounting holes 12L can be counterbores.

[0031] As shown in Figure 3 the inside of the first main sleeve 21 is sequentially the first inner diameter portion 22A, the internally threaded portion 22B, the second inner diameter portion 22C, and the tapered portion 22D from the upper side. Further, the diameter of the first inner diameter portion 22A is gradually reduced toward the second inner diameter portion 22C, and the diameter of the tapered portion 22D is gradually increased away from the second inner diameter portion 22C. Further, the valve seat member 23 is fitted and fixed to the end portion of the tapered portion 22D side in the second inner diameter portion 22C, and a tapered through-hole 23A that is continuous with the tapered portion 22D is formed in the valve seat member 23. Further, the branch hole 22E extends sideways from the second inner diameter portion 22C. Further, the valve inner flow path 14 described above is formed by the tapered portion 22D, the second inner diameter portion 22C, the through-hole 23A, and the branch hole 22E, the upper end of the through-hole 23A of the valve seat member 23 forms the valve port 15, and the spool 16 described above protrudes into the valve port 15 from the second inner diameter portion 22C side.

[0032] The outer surface of the second main sleeve 25 is sequentially the first outer diameter portion 25A, the second outer diameter portion 25B, and the externally threaded portion 25C from the upper side. As shown in Figure 4 the outer diameter of the second outer diameter portion 25B is slightly larger than the outer diameter of the first outer diameter portion 25A, and a step face 25D is formed between the first outer diameter portion 25A and the second outer diameter portion 25B. Further, an O-ring groove 25M that accommodates an O-ring 25N is provided in the second outer diameter portion 25B. In order to introduce the O-ring 25N into the first main sleeve 21, the corner where the inner surface of the first inner diameter portion 22A and the upper surface of the flange portion 12 (specifically, the upper surface of the step portion 12Z) intersect is chamfered to form an introduction face 22G. Further, asFigure 3 As shown, the outer threaded portion 25C of the second body sleeve 25 is screwed to the inner threaded portion 22B of the first body sleeve 21, and the second outer diameter portion 25B of the second body sleeve 25 is sealed by the O-ring 25N from the peripheral surface of the first inner diameter portion 22A of the first body sleeve 21. In addition, in a state where the second body sleeve 25 is assembled to the first body sleeve 21, as shown in FIG. 2, the stepped surface 25D of the second body sleeve 25 and the upper surface of the seating portion 12Z of the flange portion 12 of the first body sleeve 21 become substantially coplanar. Figure 4 As shown, the stepped surface 25D of the second body sleeve 25 and the upper surface of the seating portion 12Z of the flange portion 12 of the first body sleeve 21 become substantially coplanar.

[0033] For the inner side of the second body sleeve 25, the inner side of the first outer diameter portion 25A becomes a large diameter portion 25E, and the portion on the lower side than the first outer diameter portion 25A becomes a small diameter portion 25F. Further, the rotor housing 17 is fitted to the inner side of the large diameter portion 25E, and the rotor housing 17 abuts against the stepped surface 25G of the large diameter portion 25E and the small diameter portion 25F. In addition, the third body sleeve 26 is fixed to the small diameter portion 25F in a fitted state. As shown in FIG. 2, the lower end portion of the third body sleeve 26 protrudes into the second inner diameter portion 22C from the lower surface of the second body sleeve 25, and the upper end portion of the third body sleeve 26 protrudes upward from the stepped surface 25G of the second body sleeve 25. In addition, the first inner diameter portion 26A, the inner threaded portion 26B, and the second inner diameter portion 26C are sequentially provided in the central portion of the third body sleeve 26 from the upper side, and the diameter is gradually reduced from the upper side to the lower side. The above is a description regarding the valve body 11. Figure 3 As shown, the stepped surface 25D of the second body sleeve 25 and the upper surface of the seating portion 12Z of the flange portion 12 of the first body sleeve 21 become substantially coplanar.

[0034] As described above, the rotor 51 of the motor 50 is housed in the inner side of the rotor housing 17 provided in the valve body 11. The rotor 51 is a magnet in a cylindrical shape with a bottom at the lower end, and is magnetized in a manner that the N pole and the S pole are alternately arranged in the circumferential direction.

[0035] The rotation sleeve 30 is fixed to the central portion of the bottom wall 51A of the rotor 51. The rotation sleeve 30 has a structure in which the small diameter cylindrical portion 30B is extended downward from the large diameter cylindrical portion 30A. Further, the upper end portion of the large diameter cylindrical portion 30A is fixed in a state of penetrating the bottom wall 51A of the rotor 51, the lower portion of the large diameter cylindrical portion 30A on the lower side than the rotor 51 is supported to the first inner diameter portion 26A of the third body sleeve 26 in a rotatable manner, and the outer threaded portion 30N formed on the outer surface of the small diameter cylindrical portion 30B is screwed to the inner threaded portion 26B of the third body sleeve 26. Thus, the rotor 51 and the rotation sleeve 30 can rotate while moving linearly with respect to the valve body 11.

[0036] The upper end of the rotating sleeve 30 is sealed by a filling plug 27. Additionally, a support post 27A rises upwards from the filling plug 27. Furthermore, a known limiting mechanism is used to limit the range of rotation of the rotor 51, consisting of a spiral guide 27B formed by winding wire on the support post 27A, an abutment rod 17B hanging from a position offset from the center of the cover 17A, and a screw-in member 17D screwed into the spiral guide 27B and abutting against the abutment rod 17B.

[0037] A central shaft 31 passes through the inner side of the small-diameter cylindrical portion 30B of the rotating sleeve 30. A valve core 16 is provided at the lower end of the central shaft 31, while a head 31H is provided at the upper end of the central shaft 31, which is housed in the large-diameter cylindrical portion 30A. Furthermore, a ball bearing 32 is disposed on the head 31H, and a compression coil spring 33 provided between the ball bearing 32 and the filling plug 27 presses the head 31H against the stepped surface between the inner surface of the large-diameter cylindrical portion 30A and the inner surface of the small-diameter cylindrical portion 30B.

[0038] The valve core 16 has a structure in which a cylindrical base 16A, with an outer diameter larger than that of the central shaft 31, protrudes downwards to form a smaller diameter protrusion 16B. Furthermore, the protrusion 16B is tapered, gradually narrowing in diameter as it descends. The lower end of the base 16A abuts against the opening edge of the valve port 15, fully closing the valve port 15. When the lower end of the base 16A moves away from the opening edge of the valve port 15, the opening area of ​​the valve port 15 changes according to the amount of protrusion of the protrusion 16B into the valve port 15, thereby changing the flow rate through the valve port 15. The position of the valve core 16 in the vertical direction J1 is controlled by the motor 50, thereby controlling the flow rate through the valve port 15.

[0039] It should be noted that the valve core 16 is not limited to the shape described above. Furthermore, the valve core 16 may, for example, not control the flow rate through the valve port 15, but simply open and close the valve port 15. Moreover, the valve core 16 may be configured to allow fluid to pass slightly through the valve port 15 even when it is closed.

[0040] like Figure 2 As shown, the stator 52 of the motor 50 is structured to cover the outside of the armature 53 using a waterproof cover 54. The armature 53 includes multiple electromagnetic coils 53A and a magnetic yoke 53B forming a magnetic circuit, and is generally cylindrical. Additionally, a connector portion 53C for supplying power to the armature 53 protrudes from the outer peripheral surface of the armature 53. Figure 1 As shown, the connector portion 53C has a structure in which a terminal accessory 53K is located inside a resin cap 53D. It should be noted that the armature 53 may also be without a yoke 53B.

[0041] The waterproof cover 54 is molded on the outside of the armature 53 and is cylindrical with a bottom at the top and an open bottom. Specifically, the waterproof cover 54 has: a cylindrical large-diameter portion 55 that covers the upper and lower surfaces and side surfaces of the armature 53, except for the connector portion 53C mentioned above; and a cylindrical small-diameter portion 56 with a bottom at the top that protrudes from the center of the upper surface of the large-diameter portion 55 and has an inner circumferential surface coplanar with the inner circumferential surface of the armature 53. Furthermore, the connector portion 53C penetrates the side wall 55A of the large-diameter portion 55 and protrudes outwards.

[0042] An opening slightly larger than the inner diameter of the armature 53 is formed in the center of the bottom wall 55B of the large-diameter portion 55 that covers the lower surface of the armature 53, and a cylindrical portion 57 hangs down from the edge of the opening. The cylindrical portion 57 is cylindrical, and its inner diameter is approximately the same as the inner diameter of the first inner diameter portion 22A in the first main body sleeve 21, and its outer diameter is smaller than the outer diameter of the pedestal portion 12Z.

[0043] The stator 52 is fitted onto the outside of the rotor housing 17. Specifically, when the rotor housing 17 is fitted into the stator 52 from the lower end opening of the cylindrical portion 57 and reaches the proper fitting position, such as... Figure 2 As shown, the upper end of the rotor housing 17 is in contact with or adjacent to the upper surface inside the stator 52. Thus, the lower surface of the cylinder portion 57 is located slightly above the upper surface of the pedestal portion 12Z.

[0044] like Figure 4 As shown, a sealing member 58 is sandwiched between the stator 52 and the stator opposing portion 11D in the vertical direction J1, which is opposite to the stator 52. Here, in this embodiment, the portion of the first main sleeve 21 and the second main sleeve 25 in the valve body 11 located laterally to the outer side of the rotor housing 17 corresponds to the stator opposing portion 11D. Furthermore, the sealing member 58 is in the shape of a circular plate and is laid across the upper surface of the pedestal portion 12Z in the stator opposing portion 11D and the stepped surface 25D coplanar with the upper surface of the pedestal portion 12Z. In addition, the outer diameter of the sealing member 58 is larger than the outer diameter of the cylinder portion 57 of the stator 52, and the inner diameter of the sealing member 58 is slightly smaller than the inner diameter of the cylinder portion 57. Moreover, the thickness of the sealing member 58 is approximately 2 to 4 times the distance between the lower surface of the cylinder portion 57 and the upper surface of the pedestal portion 12Z when the cylinder portion 57 is positioned in its proper fitting position against the rotor housing 17.

[0045] In detail, the sealing member 58 is formed by punching a sheet of polyurethane foam. This polyurethane foam has a semi-continuous bubble structure and can be compressed to a compression ratio of 50-75%. Furthermore, because the polyurethane foam has a semi-continuous bubble structure, it can be compressed with low stress, resulting in an independent bubble structure that prevents air and water from passing through. Therefore, when the stator 52 is fitted into the rotor housing 17, it can be fitted into the correct fitting position without requiring a large force to flatten the sealing member 58. Moreover, the flattened sealing member 58 seals the space between the cylinder portion 57 and the flange portion 12, and also seals the fitting gap 21Z between the first main body sleeve 21 and the second main body sleeve 25. Additionally, the upper end of the fitting gap 21Z is extended by the guide surface 22G, thus allowing the sealing member 58 to enter the upper end of the fitting gap 21Z, achieving high sealing performance.

[0046] It should be noted that the sealing member 58 is a polyurethane foam with a semi-continuous bubble structure, but it is not limited to this. As long as it is a member that is flattened between the cylindrical part 57 and the flange part 12, it can be any member. For example, it can be a foam of an elastomer other than a polyurethane with a semi-continuous bubble structure, a polyurethane with an independent bubble structure, a foam of other members, or a non-foamed elastomer.

[0047] In order to fix the stator 52 to the valve body 11, such as Figure 5 As shown, a connecting member 60 is fixed to the stator 52. Specifically, the connecting member 60 is formed by punching and bending sheet metal and has a ring portion 61 that overlaps with the outer portion of the lower surface of the stator 52, which is further outward than the outer portion of the cylindrical portion 57. In addition, a plurality of fixing protrusions 55T protrude from the lower surface of the stator 52. These fixing protrusions 55T pass through and are heat-riveted to the through holes 61A formed in the ring portion 61, thereby fixing the ring portion 61 to the large-diameter portion 55. Furthermore, a connecting piece 63 hangs down from the portion of the ring portion 61 that overlaps with the outer edge of the lower surface of the stator 52. In addition, the lower end of the connecting piece 63 is bent at a right angle so as to extend outward from the stator 52, and a through mounting hole 63A is provided there. Furthermore, when the stator 52 is fitted into the proper fitting position, the lower surface of the connecting piece 63 can overlap with the upper surface of the flange portion 12, and the mounting hole 63A and the threaded hole 12N of the flange portion 12 (see reference) can be aligned. Figure 1 The stator 52 is fixed to the valve body 11 by fastening the bolt through the mounting hole 63A to the threaded hole 12N in this state. It should be noted that in this embodiment, the connecting member 60 has only one connecting piece 63, but it may also have multiple connecting pieces 63.

[0048] The above is a description of the structure of the electric valve 10A according to the present embodiment. Next, the effects of the electric valve 10A will be described. In order to install the electric valve 10A to the valve mounting object member 90, for example, the electric valve 10A is separated into the valve body 11 and the stator 52, and the valve body 11 is inserted into the valve fitting hole 91. At this time, the rotational position is aligned in such a manner that the branch hole 22E of the valve body 11 communicates with the second flow path 92B of the valve mounting object member 90, and the valve body 11 is pressed into the valve fitting hole 91. In addition, if the flange portion 12 is pressed to press the valve body 11 into the valve fitting hole 91, the valve body 11 can be pressed into the valve fitting hole 91 with a strong force without applying a load to the rotor housing 17. Furthermore, a bolt that passes through the mounting hole 12L of the flange portion 12 is fastened to the threaded hole 93 formed around the valve fitting hole 91 of the valve mounting object member 90, and thus the valve body 11 is fixed to the valve mounting object member 90.

[0049] Next, the stator 52 is fitted to the rotor housing 17 of the valve body 11. Then, the cylinder portion 57 is crushed at the seal member 58, and thus the flange portion 12 and the cylinder portion 57 are sealed. Here, the seal member 58 is a foamed body of a semi-continuous bubble structure, and thus is easily crushed. Crushing the seal member 58 does not become an obstacle to the fitting operation of the stator 52. Furthermore, a bolt is passed through the mounting hole 63A of the link piece 63 provided to the link member 60 of the stator 52 (refer to FIG. 6) and fastened to the threaded hole 12N of the flange portion 12, and thus the stator 52 is fixed to the valve body 11. Figure 5

[0050] Note that, instead of the above sequence, the valve body 11 can be inserted into the valve fitting hole 91 to fix the valve body 11 to the valve mounting object member 90 after the stator 52 is assembled to the valve body 11.

[0051] ​As described above, the stator 52 of the electric valve 10A of the present embodiment is a cylindrical shape having a bottom at one end and being open at the other end. Also, the stator 52 is fitted to the outside of the rotor housing 17 provided in the valve body 11, and the annular seal member 58 is sandwiched between the stator-opposing portion 11D provided in the valve body 11 and the stator 52 in the axial direction of the valve body 11, thereby restricting the intrusion of water into the inside of the stator 52. Thus, the waterproofness of the motor 50 is improved compared to the past. Here, in order to restrict the intrusion of water into the stator 52, a seal structure is considered in which the seal member is sandwiched by the inner surface of the stator 52 and the outer surface of the valve body 11 in the radial direction, but compared to such a seal structure, if the seal structure is provided in which the seal member 58 is sandwiched in the axial direction of the valve body 11 as in the present embodiment, the increase in the fitting resistance of the stator 52 is suppressed, the waterproofness of the motor 50 can be improved, the assembly of the stator 52 can be easily performed, and miniaturization is also achieved. Also, in the present embodiment, the cylindrical portion 57 having an outer diameter smaller than the seal member 58 is provided in the stator 52, and the cylindrical portion 57 abuts on and is sunk into the seal member 58, so that high sealability can be obtained.

[0052] [Second Embodiment]

[0053] The electric valve 10B of the present embodiment is provided with a cylindrical intermediate sleeve 57X sandwiched between the stator 52 and the stator-opposing portion 11D, instead of the cylindrical portion 57 of the stator 52 of the electric valve 10A of the first embodiment, as Figure 6 described above. Also, a recessed portion 54Z is formed in the inner edge portion of the lower surface of the stator 52, and a circular plate-shaped seal member 58X made of the same material (for example, semi-continuous bubble structure polyurethane foam) as the seal member 58 on the seat portion 12Z is housed therein. Also, the seal member 58 is flattened between the intermediate sleeve 57X and the stator-opposing portion 11D, and the seal member 58X is flattened between the intermediate sleeve 57X and the stator 52, so that each is sealed. According to the structure of the present embodiment, the intermediate sleeve 57X is provided independently from the stator 52, so that the internal stress generated due to the difference in the thermal expansion rate of the armature 53 and the waterproof cover 54 when the armature 53 is heated can be alleviated.

[0054] [Third Embodiment]

[0055] In the electric valve 10A of the first embodiment, the cylindrical portion 57 abutting on the seal member 58 is provided in the stator 52, but the electric valve 10C of the present embodiment is provided with a cylindrical portion 57X having a smaller outer diameter than the seal member 58, instead of the cylindrical portion 57 of the stator 52 of the electric valve 10A of the first embodiment, as Figure 7Thus, the cylindrical portion 57Y is provided in the stator opposing portion 11D. Specifically, the cylindrical portion 57Y is cylindrical and protrudes upward from the pedestal portion 12Z in the stator opposing portion 11D. Furthermore, a recess 54Z, identical to that in the second embodiment, is formed on the lower surface of the stator 52, and a sealing member 58X is housed there. The sealing member 58X is flattened between the cylindrical portion 57Y and the armature 53 of the stator 52, thereby sealing them together. The structure of this embodiment achieves the same effect as the second embodiment. Additionally, the sealing member 58X is protected by being housed in the recess 54Z of the stator 52.

[0056] [Fourth Implementation Method]

[0057] The electric valve 10D in this embodiment is as follows: Figure 8 Thus, the structure is as follows: a cylindrical portion 57Z is formed by equipping the inner surface of the cylindrical portion 57 of the electric valve 10A in the first embodiment with a plurality of engaging recesses 57K, and engaging protrusions 25T that engage with these engaging recesses 57K protrude from the valve body 11. Furthermore, when the stator 52 is fitted into the proper position of the valve body 11, the plurality of engaging protrusions 25T engage with the engaging recesses 57K, thereby fixing the stator 52 to the valve body 11.

[0058] [Other Implementation Methods]

[0059] (1) As Figure 9 As shown in the electric valve 10E, the flange portion 12 may also have multiple mounting holes 12L arranged in the flange portion 12 at a position covered from above by the stator 52. Alternatively, it may have a structure where the connecting piece 62 of the connecting member 60 shown in the figure overlaps with the outer peripheral surface of the flange portion 12 and is threadedly fixed.

[0060] (2) Figure 10 As shown in the electric valve 10F, the mounting hole 63A of the connecting piece 63 of the connecting member 60 described in the first embodiment can be set to a size that allows the bolt B1, which passes through the mounting hole 12L of the flange portion 12, to pass through. The bolt B1 passes through the mounting hole 63A and the mounting hole 12L and is fastened to the threaded hole 93 of the valve mounting member 90.

[0061] (3) Alternatively, an internal thread may be formed on the inner surface of the valve mounting hole 91 in the valve mounting member 90, and an external thread formed on the outer surface of the insertion part 13 may be screwed in there, thereby fixing the valve body 11 to the valve mounting member 90.

[0062] (4) In the electric valve 10A of the first embodiment described above, the connecting member 60 of the waterproof cover 54 fixed to the stator 52 may have a connecting piece 63, which is integrally formed on the waterproof cover 54.

[0063] Note that specific examples of technologies included in the technical solutions are disclosed in the present specification and the drawings, but the technologies described in the technical solutions are not limited to these specific examples, and include solutions obtained by various modifications, changes, and the like of the specific examples, and also include solutions obtained by extracting a part from the specific examples alone.

Claims

1. An electric valve having its front end inserted into a valve mounting hole that opens on the outer surface of a valve mounting member having an internal flow path, and having a motor as a drive source on its base end, and being capable of changing the flow rate of fluid flowing in the flow path, wherein, The electric valve includes: A valve body having a rotor housing that extends axially along the valve mounting hole and houses the rotor of the motor at its base end; A cylindrical stator with a bottom at one end and an open end at the other end is fitted into the outside of the rotor housing; The stator opposing portion is formed by expanding the diameter of the valve body at the midpoint of its axial direction and is opposite to the stator in the axial direction; The cylindrical portion is integrally formed on the stator and protrudes toward the opposing portion of the stator; as well as An annular sealing member is clamped in the axial direction between the opposing stator portion and the cylindrical portion, and restricts water immersion into the inside of the stator. The valve body includes: The first main sleeve has an internal valve flow path communicating with the flow path; as well as The second main sleeve is assembled inside the first main sleeve, and the rotor housing is fixed to the base end of the second main sleeve. The fitting gap between the inner surface of the first main sleeve and the outer surface of the second main sleeve opens at the opposing surface of the stator opposite part and is covered by the sealing member.

2. The electric valve according to claim 1, wherein, The sealing member is a circular plate with an outer diameter larger than that of the cylindrical part and an inner diameter that is approximately the same as or smaller than that of the cylindrical part.

3. The electric valve according to claim 1, wherein, An O-ring groove is formed on the outer surface of the second main sleeve to accommodate an O-ring that is in close contact with the inner surface of the first main sleeve. A tapered guide surface is formed on the inner edge of the first main sleeve to guide the O-ring, and the end of the fitting gap on the sealing member side is extended.

4. The electric valve according to claim 2, wherein, An O-ring groove is formed on the outer surface of the second main sleeve to accommodate an O-ring that is in close contact with the inner surface of the first main sleeve. A tapered guide surface is formed on the inner edge of the first main sleeve to guide the O-ring, and the end of the fitting gap on the sealing member side is extended.

5. The electric valve according to claim 1, wherein, The sealing component is made of polyurethane foam.

6. The electric valve according to claim 2, wherein, The sealing component is made of polyurethane foam.

7. The electric valve according to claim 3, wherein, The sealing component is made of polyurethane foam.

8. The electric valve according to claim 4, wherein, The sealing component is made of polyurethane foam.

9. The electric valve according to claim 5, wherein, The sealing component has a semi-continuous bubble structure.

10. The electric valve according to any one of claims 1 to 9, wherein, The electric valve includes a connecting piece that extends from the stator toward the stator opposite portion and is fixed to the valve body.

Images