WO2020194578A1

WO2020194578A1 - Motor-driven valve

Info

Publication number: WO2020194578A1
Application number: PCT/JP2019/013195
Authority: WO
Inventors: 和宏金森; 輝聖見津
Original assignee: 太平洋工業株式会社
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-10-01
Also published as: JPWO2020194578A1; CN112005032B; CN112005032A; JP7025563B2

Abstract

[Problem] To provide a motor-driven valve which is less expensive than conventional ones. [Solution] A motor-driven valve 10A of this disclosure has the following operation and effect. That is, the motor-driven valve 10A of this embodiment is configured such that flow passages 71, 72 of a first system and a second system respectively are formed to include a part of a shaft accommodating hole 17 for accommodating a shaft 40 so that each valve port of the flow passages 71, 72 is opened and closed by first and second valve bodies 61, 62 connected to the shaft 40. With this configuration, a motor 30 which is a driving source of the first and second valve bodies 61, 62 is shared, and therefore the cost of the motor-driven valve 10A can be reduced.

Description

Motor drive valve

The present disclosure relates to a motor drive valve including a motor as a drive source.

Conventionally, as this type of motor drive valve, those used in a plurality of locations of fluid control devices such as air conditioners and robot hands are known (see, for example, Patent Document 1).

Japanese Patent No. 6019331 (Fig. 1, paragraphs [0040], [0044])

Manufacturers and users of the above-mentioned fluid control equipment are demanding cost reduction of motor drive valves.

The invention of claim 1 made to solve the above problems includes a valve body having a shaft accommodating hole extending linearly, a shaft accommodated in the shaft accommodating hole, a motor attached to the valve body, and the like. The first screw portion formed on the shaft, the engaging shaft portion having a non-circular cross section, the second screw portion formed on the rotor of the motor and screwed with the first screw portion, and the valve body are provided. A non-circular engaging hole through which the engaging shaft portion is non-rotatable and linearly movable, a plurality of valve seats having a reduced diameter at a plurality of axial positions of the shaft accommodating hole, and the inside of the valve seats. A plurality of valve openings, a plurality of valve bodies connected to the shaft and opening and closing the plurality of valve openings as the shaft moves linearly, and each valve port formed on the valve body. Between a plurality of flow paths having a part of the shaft accommodating hole including a mouth and a branch path intersecting the mouth, and both ends opening to the outer surface of the valve body, and the flow paths having different systems. It is a motor drive valve including a sliding contact seal portion that is arranged and slidably in contact with the outer surface of the shaft, and a plurality of short shafts that are formed by dividing the shaft into each valve body and screw-coupled to each other.

Side sectional view of the motor drive valve according to the first embodiment Enlarged side sectional view of the part of the motor drive valve including the flow path of the second system Enlarged side sectional view of the part of the motor drive valve including the flow path of the first system Perspective view of the first short shaft, partition member, and E-ring Side sectional view of the motor drive valve according to the second embodiment Side sectional view of a motor drive valve having three valve bodies

[First Embodiment]
Hereinafter, the motor drive valve 10A of the first embodiment will be described with reference to FIGS. 1 to 4. The posture of the motor drive valve 10A is not limited when used, but for convenience of explanation, the upper side in FIGS. 1 to 4 is referred to as the upper side in the motor drive valve 10A, and the opposite side is referred to as the lower side. ..

As shown in FIG. 1, the valve body 11 of the motor drive valve 10A is formed by assembling the first to

fourth body components

21, 22, 23, 24, etc. to the body body 12. The body body 12 has, for example, a rectangular parallelepiped shape, and a pilot hole 18 penetrates in the vertical direction. The prepared hole 18 has a minimum inner diameter portion 18A having the smallest inner diameter at an intermediate position in the vertical direction. Further, in the prepared hole 18, a first inner diameter portion 18B and a screw portion 18C are formed so as to gradually increase the diameter upward from the minimum inner diameter portion 18A, and gradually gradually increase downward from the minimum inner diameter portion 18A. The second inner diameter portion 18D, the third inner diameter portion 18F, and the fourth inner diameter portion 18G are formed so as to expand the diameter. Further, an intermediate screw portion 18E is formed at the lower end portion of the second inner diameter portion 18D, and the other end side screw portion 18H is formed at the lower end portion of the fourth inner diameter portion 18G.

The body body 12 has a branch path 71A extending from the first side surface 12A to the lower end of the first inner diameter portion 18B, a branch path 72A extending from the first side surface 12A to the intermediate portion of the third inner diameter portion 18F, and a first side surface 12A. A branch path 71B extending from the second side surface 12B on the opposite side or the adjacent side to the intermediate portion of the minimum inner diameter portion 18A is provided. Then, the flow path 71 of the first system is formed from the

branch paths

71A and 71B and a part of the pilot holes 18 connecting between them, and the branch paths 72A and the third inner diameter portion 18F of the pilot holes 18 are formed. The flow path 72 of the second system is formed by the central hole 22A of the second body component 22 described later.

The body body 12 is not limited to a rectangular parallelepiped shape, and may be, for example, a columnar shape, an elliptical columnar shape, a hexagonal columnar shape, or a polygonal columnar shape. Further, the opening angle between the pair of branch paths included in the same flow path as in the pair of

branch paths

71A and 71B included in the flow path 71 is not 180 degrees as in the example shown in FIG. It may be any angle.

Hereinafter, the structure of the portion below the minimum inner diameter portion 18A of the motor drive valve 10A will be described in detail with reference to FIG. The above-mentioned second body component 22 has a sleeve shape in which the outer diameter is gradually reduced upward, and on the outer surface thereof, the large outer diameter portion 22G1 and the middle outer diameter are sequentially arranged from the bottom to the top. A portion 22G2 and a small outer diameter portion 22G3 are provided, and on the inner surface, a small inner diameter portion 22N2 continuous inside the middle outer diameter portion 22G2 and the small outer diameter portion 22G3, and a large inner diameter located inside the large outer diameter portion 22G1. A unit 22N1 is provided. Further, a screw portion 22M is formed at the lower end portion of the large outer diameter portion 22G1, and an O-ring groove is formed at the upper end portion of the large outer diameter portion 22G1, and the O-ring 22S is housed therein.

Then, the stepped surface between the inner and outer diameter portions 22G2 and the small outer diameter portion 22G3 of the second body component 22 and the stepped surface between the third inner diameter portion 18F and the fourth inner diameter portion 18G of the prepared hole 18 are brought into contact with each other. The two body component 22 is positioned on the body body 12, and the second body component 22 is fixed to the body body 12 by screwing the screw portion 22M and the screw portion 18H on the other end side.

Further, the portion of the second body component 22 sandwiched between the small outer diameter portion 22G3 and the small inner diameter portion 22N2 forms a second valve seat 52 located in the middle of the flow path 72 of the second system, and the second valve seat 52 thereof is formed. The inside of the 2 valve seat 52 is the second valve port 52A. The cross-sectional shape of the second valve seat 52 is a semicircle that bulges upward, but it does not have to be, and it is a cross-sectional shape that has a triangular shape that is pointed upward and a flat upper surface. You may.

The third and

fourth body components

23 and 24 are fixed to the minimum inner diameter portion 18A side of the second body component 22 in the prepared hole 18. The third body component 23 has a tubular shape with an open lower end and an end wall 23G at the upper end. The end wall 23G has a through hole 23H in the center, and has a concentric recessed portion 23J on the upper surface thereof. Further, a screw portion 23N is formed at the lower end of the outer surface of the third body component 23, and an O-ring groove is formed at a position near the upper end of the outer surface of the third body component 23, and the O-ring 23S is accommodated therein. Has been done.

The fourth body component 24 has a disk shape having a central hole 24A, and its outer surface is divided into a large outer diameter portion 24G1 and a small outer diameter portion 24G2, and a stepped surface 24G3 is provided between them. The large outer diameter portion 24G1 is fitted into the depressed portion 23J of the third body component 23, and the stepped surface 24G3 is flush with the upper surface of the third body component 23. Then, the small outer diameter portion 24G2 of the fourth body component 24 is fitted to the lower end portion of the minimum inner diameter portion 18A, and the upper surfaces of the third and

fourth body components

23 and 24 and the minimum inner diameter of the prepared hole 18 are formed. The third and

fourth body components

23 and 24 are positioned on the body body 12 by the contact between the stepped surface of the portion 18A and the second inner diameter portion 18D, and the screw portion 23N and the intermediate screw portion 18E of the prepared hole 18 are positioned. The second body component 22 is fixed to the body body 12 by screwing.

On the lower surface of the fourth body component 24, a recessed portion 24K1 is formed in which the inner portion is slightly recessed upward from the outer edge portion. Further, in the central hole 24A of the fourth body component 24, a diameter-expanded portion 24K2 is formed in which the lower portion is slightly expanded in a stepped shape. Then, the disk-shaped seal member 24S having a central hole (corresponding to the “sliding seal portion” in the claims) is received by the recessed portion 24K1 and becomes the third and

fourth body components

23 and 24. It is sandwiched. Further, the inner edge portion of the seal member 24S projects into the central hole 24A, is pushed by the second short shaft 42 inserted into the central hole 24A from below, and adheres to the enlarged diameter portion 24K2 in a tubular shape. It has been accepted. The sealing member 24S and the O-ring 23S described above seal the flow path 71 of the first system and the flow path 72 of the second system.

The inner portion of the third body component 23 is a second valve body support portion 23B in which the second valve body 62 is fitted so as to be linearly movable, and the opening area inside the second valve body support portion 23B. The opening area inside the contact portion between the second valve body 62 and the second valve seat 52 is substantially the same. The second valve body 62 has a tubular shape with an open upper end and a bottom wall 62G at the lower end. Further, at the upper end portion of the second valve body 62, a press-fitting portion 62K1 having an enlarged diameter inside and a diameter expanding portion 62K2 having a slightly reduced diameter outside are formed. Then, the seal holding cylinder 62Z having the flange 62X at the upper end is press-fitted into the press-fitting portion 62K1, and the inner edge portion of the disc-shaped sealing member 62S is sandwiched between the upper end surface of the second valve body 62 and the flange 62X. ing. Further, the outer edge portion of the seal member 62S projects laterally to the second valve body 62, and the second valve body 62 is fitted into the second valve body support portion 23B from below to be deformed into a tubular shape and adhere to the seal member 62S. The fitting seal portion 62U is received by the enlarged diameter portion 62K2.

A flange portion 62F is provided at the lower end portion of the second valve body 62, and the lower surface of the second valve body 62 is extended laterally. Further, a pair of tubular walls 62W are formed concentrically on the outer edge of the lower surface of the second valve body 62, and an annular sealing member 62P is accommodated and fixed by caulking between them. The second valve body 62 has a valve closing position in which the seal member 62P abuts on the second valve seat 52 and the second valve port 52A is closed, and the seal member 62P is separated from the second valve seat 52. 2 The valve port 52A moves between the open valve position and the valve opening position. Further, a compression coil spring 29 is received between the bottom wall 62G of the second valve body 62 and the end wall 23G of the third body component 23, and the second valve body 62 is urged toward the valve closing position. Has been done.

A through hole 62H is formed in the center of the bottom wall 62G, through which the above-mentioned second short shaft 42 penetrates. Further, the bottom wall 62G is formed with a plurality of ventilation holes 62J around the through holes 62H. As a result, the second valve body 62 receives the same fluid pressure from above and below at the valve closed position. Then, as described above, the opening area inside the second valve body support portion 23B and the opening area inside the contact portion between the second valve body 62 and the second valve seat 52 are substantially the same, and the valve closing position. Since the pressure receiving area where the second valve body 62 receives the fluid pressure from above and the pressure receiving area where the fluid pressure is received from below are the same, the second valve body 62 in the valve closed position is moved upward and downward by the fluid pressure. The force received from is substantially offset, and the power when opening the second valve body 62 is reduced.

Specifically, in a state where one branch path 72A side of the flow path 72 of the second system is the upstream side and the other branch path 72B side is the downstream side, the second valve body 62 at the valve closing position is on the downstream side. Due to the low fluid pressure of, the force received from above and below is the same. Further, the forces received by the second valve body 62 from above and below due to the high fluid pressure on the upstream side are substantially the same, and even if there is a difference between them, the contact of the second valve seat 52 with respect to the second valve body 62. Only the difference in contact area is a slight difference. Therefore, as described above, the forces received by the second valve body 62 at the valve closing position from above and below due to the fluid pressure are substantially offset. As a result, the elastic force of the compression coil spring 29 for holding the second valve body 62 in the valve closed position can be reduced, and as a result, the second valve body 62 is moved from the valve closed position to the valve open position. The power required at that time can be suppressed.

It should be noted that the opening area inside the second valve body support portion 23B and the opening area inside the contact portion between the second valve body 62 and the second valve seat 52 may not be the same. However, since a part of the force received from above and below by the fluid pressure of the second valve body 62 in the valve closed position is canceled out, the power when opening the second valve body 62 is reduced. The same applies to the first valve body 61.

The power to the second valve body 62 is transmitted from the motor 30 described later to the second valve body 62 via the second short shaft 42, so that the contact flange 42F projects from the position near the lower end of the second short shaft 42. There is. Then, when the second short shaft 42 is driven upward by the motor 30, the second valve body 62 is pushed by the contact flange 42F and moves to the valve opening position side. The contact flange 42F of the second short shaft 42 will be described together with the contact flange 41F of the first short shaft 41, which will be described later.

The structure of the portion below the minimum inner diameter portion 18A of the motor drive valve 10A has been described above. Next, the structure of the portion above the minimum inner diameter portion 18A of the motor drive valve 10A will be described in detail with reference to FIGS. 3 and 4. As shown in FIG. 3, a cylindrical first valve seat 51 projects upward from the opening edge of the stepped surface between the minimum inner diameter portion 18A and the first inner diameter portion 18B. Then, the inside of the first valve seat 51 forms the first valve port 51A, and the first valve body 61 that opens and closes the first valve port 51A is arranged above the first valve seat 51, and the first body component component. It is supported by 21 so as to be linearly movable.

Here, since the first valve body 61 has the same structure as the second valve body 62 described above, the second valve has the same structure as the second valve body 62 among the first valve bodies 61. Duplicate description will be omitted by describing in FIGS. 1 and 3 the reference numerals in which "62" included in the reference numerals of the respective parts of the body 62 is replaced with "61".

The first body component 21 has a sleeve shape whose diameter is gradually reduced downward, and on the outer surface thereof, the first outer diameter portion 21G1 and the second outer diameter portion 21G2 are sequentially formed from the lower end to the upper end. , A third outer diameter portion 21G3 is provided. An O-ring groove is formed in the axially intermediate portion of the first outer diameter portion 21G1 to accommodate the O-ring 21S, and a screw portion is formed in the axially intermediate portion of the second outer diameter portion 21G2. 21M is formed. Then, the first body component 21 is formed by contacting the stepped surface between the first outer diameter portion 21G1 and the second outer diameter portion 21G2 and the stepped surface between the first inner diameter portion 18B of the prepared hole 18 and the screw portion 18C. Is positioned with respect to the body body 12, and the first body component 21 is fixed to the body body 12 by screwing the screw portion 21M and the screw portion 18H on the other end side of the prepared hole 18.

Inside the first body component 21, a partition member 25 is provided at an intermediate position in the vertical direction. Of the inner portions of the first body component 21, the lower side of the partition member 25 forms the first valve body support portion 21B, and the upper end portion of the first valve body 61 is fitted therein so as to be linearly movable. Then, the first valve body 61 is urged to the valve closing position by the compression coil spring 28 housed between the partition member 25 and the first valve body 61. Further, the inner diameter of the first valve body support portion 21B and the inner diameter of the first valve port 51A are the same.

As shown in FIG. 4, the partition member 25 is formed separately from the main body of the first body component 21 for convenience of processing, and as shown in FIG. 3, is formed on the inner surface of the main body of the first body component 21. It is press-fitted and fixed to the formed press-fitting portion 21N1 to become a part of the first body component 21. Further, as shown in FIG. 4, the partition member 25 is formed with an engaging hole 25A in the central portion and a plurality of ventilation holes 25C are formed around the engaging hole 25A. The engagement hole 25A has a D shape with a part of the circle cut flat. Then, the first short shaft 41 penetrates the through hole 61H of the first valve body 61 and the engagement hole 25A of the partition member 25. The portion of the first short shaft 41 that penetrates the engaging hole 25A is an engaging shaft portion 41E having a D-shaped cross-sectional shape corresponding to the engaging hole 25A. That is, the first short shaft 41 is supported in a state in which rotation is restricted and linear movement is permitted by the engagement hole 25A of the first body component 21 (specifically, the partition member 25).

As shown in FIG. 3, the contact flange 41F projects from the position near the lower end of the first short shaft 41 and faces the opening edge of the through hole 61H of the first valve body 61 from below. Specifically, as shown in FIG. 4, an engaging groove 41G is formed at a position near the lower end of the first short shaft 41, and an E-ring 91 is press-fitted into the engaging groove 41G from the side to form the above-mentioned contact flange 41F. Has been done. The contact flange 42F of the second short shaft 42 has the same structure. Then, when the first short shaft 41 moves upward, the first valve body 61 is pushed by the contact flange 41F from below, and the first valve seat 51 moves to the valve opening position side.

As shown in FIG. 3, a screw hole 41B that opens on the lower surface is formed at the lower end of the first short shaft 41. On the other hand, as shown in FIG. 1, the upper end portion of the second short shaft 42 has a stepped diameter reduction, and a male screw 42A is formed on the outer surface thereof. A male screw 42A is screwed into the screw hole 41B, and the shaft 40 is composed of a first short shaft 41 and a second short shaft 42. As a result, the first valve body 61 and the second valve body 62 move between the valve closing position and the valve opening position due to the linear movement of the shaft 40.

A groove-shaped tool engaging portion 42C (corresponding to the "tool engaging portion" in the claims) is provided on the lower surface of the second short shaft 42. Then, a flat-blade screwdriver or the like can be engaged there to easily screw the second short shaft 42. Further, in the present embodiment, the shaft 40 moves upward from the state where both the first valve body 61 and the second valve body 62 are arranged in the valve closed position, so that the first valve body 61 and the second valve body 62 and the second valve body 62 are moved upward. Although the 62s are opened substantially at the same time, one of the first valve body 61 and the second valve body 62 may be opened later than the other.

As shown in FIG. 3, the first body component 21 is a part of the stator 32 of the motor 30. Specifically, inside the first body component 21, a first fitting portion 21N2 and a second fitting portion 21N3 are formed so as to gradually increase the diameter toward the upper side of the partition member 25. .. Then, the cylindrical body 31 is fitted to the second fitting portion 21N3 and sealed and fixed by brazing or the like. Further, a lid 31A is fitted to the upper end of the cylindrical body 31 and sealed and fixed by brazing or the like. The rotor 35 of the motor 30 is rotatably supported by the bearing 30B fitted to the protrusion on the lower surface of the lid 31A and the bearing 30B fitted to the first fitting portion 21N2. A plurality of magnets 35G are embedded in the outer peripheral surface of the rotor 35. An annular armature 36 containing a plurality of electromagnetic coils 36G is fitted on the outside of the cylindrical body 31. As described above, in the present embodiment, the stator 32 of the motor 30 is composed of the first body component 21, the cylindrical body 31, the lid 31A, the armature 36, and the like fixed directly or indirectly to the first body component 21. ..

Further, a second screw portion 35N is formed in the central portion of the rotor 35. Then, the first screw portion 41N formed at the upper end portion of the first short shaft 41 is screwed into the second screw portion 35N. As a result, when the rotor 35 rotates, the shaft 40 moves linearly. That is, in the present embodiment, the power conversion mechanism 90 that converts the rotation of the rotor 35 into the linear movement of the shaft 40 is engaged with the first and

second screw portions

35N and 41N, the engagement holes 25A, and the engagement shaft portion 41E. It includes the joint part. Then, the linear movement of the shaft 40 causes the first valve body 61 and the second valve body 62 to move between the valve closing position and the valve opening position.

Although the motor 30 of the present embodiment is a stepping motor, it may be a motor other than the stepping motor, for example, a brush motor, a brushless motor, or an air motor.

This concludes the description of the configuration of the motor drive valve 10A of this embodiment. The motor drive valve 10A is manufactured as follows. The shaft 40 is prepared in a state of being divided into a first short shaft 41 and a second short shaft 42. Then, all the components to be assembled to the body body 12 from above are assembled as the motor unit 30U separately from the body body 12. Further, all the components other than the second short shaft 42 among the components to be assembled from the lower side are assembled to the body body 12. Then, the motor unit 30U is assembled to the body body 12 from above. As a result, the valve body 11 is formed by the body body 12 and the first to fourth body components 21 to 24. Further, a shaft accommodating hole 17 is formed from the prepared hole 18 and the central holes of the first to fourth body components 21 to 24. Then, the second short shaft 42 is inserted into the shaft accommodating hole 17 from below and screwed and connected to the first short shaft 41 to complete the motor drive valve 10A.

The motor drive valve 10A of the present embodiment has the following effects. That is, in the motor drive valve 10A of the present embodiment, the

flow paths

71 and 72 of the first system and the second system are formed so as to include a part of the shaft accommodating holes 17 accommodating the shaft 40, respectively. The first and

second valve bodies

61 and 62 connected to the above are configured to open and close the valve openings of the

flow paths

71 and 72, so that the drive sources of the first and

second valve bodies

61 and 62 are driven. The motor 30 is shared, and the cost of the motor drive valve 10A can be reduced.

Further, as described above, all the components to be assembled to the body body 12 from above are made into the motor unit 30U, then assembled to the body body 12 from above, and the second short shaft 42 is assembled from the opposite side to the motor unit 30U. Since the assembly is completed by screwing and connecting with the first short shaft 41 which is a part of the above, the assembly work can be easily performed. Moreover, since the first short shaft 41 is prevented from rotating by the power conversion mechanism 90 included in the motor unit 30U, the first and second

short shafts

41 and 42 can be easily screwed together.

Further, the power conversion mechanism 90 may have a rack and pinion structure, but in the present embodiment, since the structure is such that the rotation of the shaft 40 is restricted and screwed into the rotor 35 of the motor 30, it is coaxial with the shaft 40. The motor 30 is arranged in the motor 30 to make it compact.

[Second Embodiment]
Hereinafter, the motor drive valves 10B and 10C of the second embodiment will be described with reference to FIGS. 5 and 6. The valve bodies 11V of the motor drive valves 10B and 10C of the present embodiment are formed by connecting a plurality of small bodies 11X having the same shape.

As shown in FIG. 5, in the small body 11X, for example, the valve body 11 (see FIG. 1) of the first embodiment is horizontally cut at a position near the upper end of the second inner diameter portion 18D of the prepared hole 18, and the cutting thereof is performed. The inner diameter of the second inner diameter portion 18D remaining on the upper portion of the surface is a lower surface recess 18X larger than the outer diameter of the third outer diameter portion 21G3 of the first body component 21. Then, the motor unit 30U of the first embodiment is assembled to the first small body 11X among the plurality of small bodies 11X constituting each of the motor drive valves 10B and 10C.

The fifth body component 75 is assembled to the second small body 11X. The fifth body component 75 cuts the first body component 21 of the first embodiment horizontally at the boundary portion between the second and third outer diameter portions 21G2 and G3, and instead of the partition member 25, the partition wall It is equipped with 75A integrally. Further, the fifth body component 75 and the first body component 21 are in a state where the valve body 61B having the same shape as the first valve body 61 (see FIG. 3) is fitted inside and the compression coil spring 28 is received. Similarly, it is assembled to the pilot hole 18 of the second small body 11X. Then, the upper part of the fifth body component 75 is in a state of protruding from the upper surface of the small body 11X.

On the upper surface of the fifth body component 75, a recess 75B having the same shape as the recess 23J of the third body component 23 of the first embodiment is formed, and the bottom of the recess 75B serves as a partition wall 75A. There is. Further, the large outer diameter portion 24G1 of the fourth body component 24 of the first embodiment is fitted to the recessed portion 75B, and the seal member 24S is inserted between the fourth and

fifth body components

24 and 75. Be pinched. Further, an O-ring groove is formed around the recessed portion 75B on the upper surface of the fifth body component 75, and the O-ring 75S is housed therein.

The second small body 11X to which the fourth and

fifth body components

24, 75 and the like are assembled is superposed on the lower surface of the first small body 11X, and the small outer diameter of the fourth body component 24 is small. The portion 24G2 is fitted into the minimum inner diameter portion 18A of the prepared hole 18 of the first small body 11X. Then, in this state, the first and second small bodies 11X are fixed to each other with bolts, and the second short shaft 42 is inserted below the small body 11X. Then, the male screw 42A of the second short shaft 42 is screwed and connected to the first small body 11X into the screw hole 41B of the first short shaft 41 of the motor unit 30U. Then, if the lid 76 is attached to the lower surface recess 18X of the second small body 11X together with the O-ring 76S and fixed with bolts, the motor drive valve 10B having the

flow paths

71 and 72 of two systems is obtained as shown in FIG. Complete.

Further, at the lower end of the second short shaft 42 of the present embodiment, the same screw hole 42B as the screw hole 41B of the first short shaft 41 is formed. Therefore, without attaching the lid 76 to the lower surface recess 18X of the second small body 11X, the third small body 11X having the same structure as the second small body 11X is superposed on the lower surface of the second small body 11X. If the lid 76 is attached to the lower surface recess 18X of the third small body 11X and fixed with bolts, the

flow paths

71, 72, 73 of three systems are provided as shown in FIG. The motor drive valve 10C is completed.

In this case, the bolts penetrating the second and third small bodies 11X may be screwed into the screw holes of the first small body 11X to fix the three small bodies 11X.
As described above, in the motor drive valves 10B and 10C of the present embodiment, the number of connected small bodies 11X can be changed to arbitrarily change the number of systems of the

flow paths

71, 72, 73.

[Other Embodiments]
(1) In the above embodiment, the fluid pressure and the pressure receiving area received from the upstream side and the downstream side are the same when the first and

second valve bodies

61 and 62 are closed, but any one of them or Both may be different.

(2) The shapes of the first and

second valve bodies

61 and 62 are not limited to the shapes of the above-described embodiment, and as an example of other shapes, a cone shape (for example, a cone, a polygonal cone, a truncated cone) is used. , Pyramid cone), spherical, hemispherical, cylindrical, etc. Further, in the above-described embodiment, the first and

second valve bodies

61 and 62 are provided with the sealing

members

61P and 62P, but the valve seats 51 and 52 may be provided with the sealing members. Further, the valve body and the valve seat may be made of metal, and one of them may bite into the other metal, so-called metal touch. Further, the flow rate of the fluid may be controlled by controlling the positions of the first and second valve bodies with a motor.

(3) In the above embodiment, the shaft 40 is divided into the first and second

short shafts

41 and 42, but the shaft 40 may not be divided.

(4) The valve body 11 of the above embodiment has a plurality of component assembly structure in which the first to

fourth body components

21, 22, 23, 24 and the like are assembled to the body body 12, but the valve body Reference numeral 11 denotes a completely integral structure that cannot be disassembled, instead of an assy structure. Further, the first body component 21, which is one of the components of the valve body 11, has an assembly structure in which the partition member 25 is press-fitted and fixed to the press-fit portion 21N1 of the main body of the first body component 21. The first body component 21 may also have a completely integrated structure that cannot be disassembled into the main body and the partition member 25.

10A, 10B, 10C

Motor drive valve

11, 11V Valve body 11X Small body 12 Body body 17 Shaft accommodating hole 18

Pilot hole

21, 22, 23, 24, 75 1st to 5th body components 21B 1st valve

body support Part

22A, 24A Center hole 23B Second valve body support part 24S Seal member (sliding contact seal part)
25A Engagement hole 30 Motor 32 Stator 35 Rotor 35N 2nd screw part 40 Shaft 41 1st short shaft 41E Engagement shaft part 41N 1st screw part 42 2nd short shaft 42C Tool engagement part 51 1st valve seat 51A 1st Valve port 52 2nd valve seat 52A 2nd valve port 61 1st valve body

61B Valve body

61U, 62U Fitting seal part 62

2nd valve body

71, 72

Flow path

71A, 71B, 72A, 72B Branch path 90 Power conversion mechanism

Claims

A valve body with a shaft accommodating hole that extends linearly,
The shaft accommodated in the shaft accommodating hole and
The motor attached to the valve body and
A first screw portion formed on the shaft, an engaging shaft portion having a non-circular cross section, and
A second screw portion formed on the rotor of the motor and screwed with the first screw portion,
An engaging hole provided in the valve body and having a non-circular cross section through which the engaging shaft portion rotatably and linearly moves.
A plurality of valve seats formed by reducing the diameters of a plurality of positions of the shaft accommodating holes in the axial direction, and a plurality of valve openings inside the valve seats.
A plurality of valve bodies connected to the shaft and opening and closing the plurality of valve openings as the shaft moves linearly.
A plurality of systems formed in the valve body for each valve port, having a part of the shaft accommodating hole including each valve port and a branch path intersecting the same, and both ends open to the outer surface of the valve body. Flow path and
A sliding contact seal portion that is arranged between the flow paths having different systems and is in sliding contact with the outer surface of the shaft.
A motor drive valve including a plurality of short shafts in which the shaft is divided into valve bodies and screwed to each other.
The motor drive valve according to claim 1, wherein a tool engaging portion for engaging a tool for screwing operation is provided at an end portion of the short shaft.
The valve body has a plurality of body components fixed inside a pilot hole penetrating the body body, and the shaft accommodating hole is a part of the pilot hole and a part or all of the plurality of body components. Consists of a central hole that penetrates
The plurality of body components, the plurality of short shafts, and the plurality of valve bodies include a first body component, a first short shaft, a first valve body, and the lower portion, which are assembled into the prepared holes from one end side thereof. The hole includes a second body component, a second short shaft, and a second valve body that are assembled from the other end side, and the first valve body is connected to the first short shaft, while the second short shaft. The second valve body is connected to the first body component, and the first body component constitutes a part of the stator of the motor and has the engaging hole to support the first short shaft. Or the motor drive valve according to 2.
A plurality of valve body support portions provided on the valve body and fitted with the plurality of valve bodies so as to be linearly movable,
A fitting seal portion that seals between each of the valve bodies and each of the valve body support portions,
The motor drive valve according to any one of claims 1 to 3, further comprising a vent hole that penetrates a position closer to the center than a portion of each valve body that comes into contact with the valve seat.
The motor drive valve according to claim 4, wherein the opening area inside the contact portion between each of the valve bodies and each of the valve seats and the opening area inside of each of the valve body support portions are substantially the same.