JP2020159505A - Flow control valve device - Google Patents

Abstract

To provide a flow control valve device in which the sealing performance of a diaphragm valve is maintained and a main body part can be easily installed to a motor part in a predetermined direction.SOLUTION: A connecting part 30 is rotatably installed to a main body part 20 in which a diaphragm valve 22 is fixed to the upper surface of a valve box 21, and the connecting part 30 is installed to an elevating body 64 of a motor part 60. At the time of this installation, even if the connecting part 30 rotates when the connecting part 30 is screwedly engaged into the elevating body 64, the main body part 20 is rotatably installed to the connecting part 30 and does not rotate together. After the connecting part 30 is completely screwed into the elevating body 64 and the rotation is stopped, the main body part 20 is freely rotated with respect to the connecting part 30 so that an inflow port 23a and an outflow port 23b of the valve box 21 face a predetermined direction, and then, the motor part 60 is integrally secured.SELECTED DRAWING: Figure 4

Description

The present invention relates to a flow rate control valve device for adjusting the flow rate of a fluid flowing through a pipe.

As a conventional flow rate control valve device, for example, Patent Document 1 is known. In the flow rate control valve device of Patent Document 1, a stepping motor is mounted on the upper part of a valve box in which a flow path from the inflow port to the outflow port through the valve chamber is formed. A diaphragm valve whose opening degree is controlled by the vertical position of the elevating body of the stepping motor is arranged between the valve box and the stepping motor.

The elevating body and the diaphragm valve connected to the rotary drive shaft of such a stepping motor are integrated by screwing the threaded portion at the lower end of the elevating body and the threaded portion of the diaphragm valve. Further, since the diaphragm valve is only fixed between the valve box and the motor by the pressing force of the screw, the sealing property may be insufficient.

Therefore, in recent years, in order to improve the sealing property between the diaphragm valve and the valve chamber, the diaphragm valve is previously welded to the top surface of the valve chamber using, for example, a laser, or adhered with an adhesive. After that, a valve lid is attached to the valve chamber, and the shaft portion of the diaphragm valve is connected to the elevating body connected to the rotary drive shaft of the motor. By fixing the valve box composed of the valve lid and the valve chamber and the diaphragm valve in this way, the sealing property is improved.

Japanese Unexamined Patent Publication No. 2005-549954

However, when the diaphragm valve integrated with the valve box is screwed and attached to the elevating body as described above, the valve box also rotates together with the diaphragm valve. Therefore, since it is necessary to completely screw the shaft of the diaphragm into the elevating body until the rotation stops, the directions of the inlet and outlet of the valve box that have received the rotation depend on the direction of the rotation, and the predetermined direction is set with respect to the stepping motor. It becomes difficult to select.

Unless the valve box and the stepping motor are aligned in a predetermined direction, it becomes difficult to make the whole compact. In addition, when connecting the inflow port and outflow port to the piping of the fluid supply device, or when connecting the stepping motor to the electric cable, it becomes difficult to connect at the shortest distance, and it takes time for the connection work, so it is difficult to install. There is a problem that the required space also increases.

An object of the present invention is to provide a flow rate control valve device in which a diaphragm valve is fixed to a valve box to maintain the sealing property of a flow path, and a main body portion can be easily attached to a motor portion in a predetermined direction. is there.

The flow rate control valve device according to the present invention for achieving the above object includes a main body and a connecting portion of a motor portion that is rotatably attached to the main body and has an elevating body that moves up and down. A flow rate control valve device comprising a valve having a main body portion that connects a pair of pipe bodies serving as fluid inlets and outlets from the side and internally communicates the pipe bodies with each other. It is composed of a box and a diaphragm valve fixed to the valve box and pushing and pulling the valve body at the lower end of the shaft portion to change the cross-sectional area of the flow path portion and adjust the flow rate of the passing fluid. It is characterized by that.

According to the flow rate control valve device according to the present invention, it is possible to maintain a state in which the inflow port and the outflow port of the main body portion are directed in a predetermined direction with respect to the motor portion while maintaining the sealing property of the diaphragm valve. Therefore, it is possible to save space in the housing including the flow rate control valve device.

It is an exploded perspective view of the Example of the flow rate control valve device. It is a perspective view. It is a sectional view. It is sectional drawing which attached the motor part with the flow path part open. It is sectional drawing which attached the motor part in the state which closed the flow path part.

The present invention will be described in detail with reference to the illustrated examples.
FIG. 1 is an exploded perspective view of the flow rate control valve device 10 of the embodiment, FIG. 2 is a perspective view, and FIG. 3 is a sectional view. The flow rate control valve device 10 adjusts the flow rate of a fluid which is a chemical solution having strong chemical activity such as an aqueous solution of hydrogen fluoride and hydrochloric acid, and rotates on a main body 20 through which the fluid flows and an upper part of the main body 20. It is composed of a connecting portion 30 that is freely attached. At the time of use, the main body portion 20 is integrated with the motor portion described later via the connecting portion 30.

The main body 20 is composed of a valve box 21 that adjusts the flow rate inside, and a diaphragm valve 22 that is fixed to the upper surface of the valve box 21 by welding or adhesion and inserted inside the valve box 21. A pair of inflow ports 23a and outlets 23b made of a tubular body are projected on both sides of the valve box 21. For the valve box 21, the inflow port 23a, and the outflow port 23b, a resin suitable for the characteristics of the flowing fluid, for example, a fluororesin such as PFA having heat resistance and chemical resistance is used, and resin molding such as injection or extrusion is used. Made by.

Inside the valve box 21, a flow path portion 24 for communicating the inflow port 23a and the outflow port 23b is formed, and in the center of the upper surface of the valve box 21, a circle formed of a circular recess for fixing the diaphragm valve 22. The shaped recess 25 and the through holes 26 are formed at the four corners in the vertical direction.

The resin or rubber diaphragm valve 22 includes a columnar shaft portion 22a formed on the central shaft, a substantially inverted conical valve body 22b formed at the lower end of the shaft portion 22a, and the periphery of the shaft portion 22a. It has a thin diaphragm film 22c formed concentrically.

A protrusion 22d is formed in an annular shape downward on the outer peripheral portion of the diaphragm film 22c, and the peripheral edge portion which is the outer surface of the protrusion 22d and the inner edge of the circular recess 25 are fixed by welding or adhesion. Has been done. Further, an annular recess 22e is formed on the upper side surface of the shaft portion 22a, and the head portion 22f above the annular recess 22e has a disk shape.

The flow path portion 24 reaches the outflow port 23b from the inflow port 23a via the inner surface of the circular recess 25 of the valve box 21 and the diaphragm film 22c and the inside of the valve box 21. A valve seat 24a having a substantially inverted conical inner surface is formed in the flow path portion 24 of the valve box 21 so as to face the substantially inverted conical outer surface of the valve body 22b. By pushing and pulling the diaphragm valve 22 in the vertical direction by the motor portion, the valve body 22b is brought into close contact with or separated from the valve seat 24a, and the flow rate can be adjusted by changing the cross-sectional area of the flow path portion 24 between them. Has been made.

The connecting portion 30 includes semi-cylindrical coupling halves 31a and 31b in which a cylindrical member is equally divided into two in the vertical direction in order to rotatably attach to the annular recess 22e of the shaft portion 22a, and these couplings. The halves 31a and 31b are fixed and integrated by screwing, and are composed of a connecting portion 32 that is connected to the motor portion and pushes and pulls the diaphragm valve 22 in the vertical direction. The coupling halves 31a and 31b and the connecting portion 32 are made of resin, and are manufactured by grinding a fluororesin member such as POM.

A semi-flange-shaped annular convex portion 33 for rotatably fitting into the annular concave portion 22e of the diaphragm valve 22 is provided at the lower portion of each of the coupling halves 31a and 31b, and the coupling halves 31a and 31b are combined with each other. A first external threaded portion 34 for screwing into the connecting portion 32 is formed on the upper outer peripheral surface of the state. The connecting portion 32 has a substantially cylindrical shape, and an internal screw portion 35 for screwing the first external screw portion 34 is formed in the lower portion, and a second external screw for connecting to the motor portion is formed on the upper outer peripheral surface. The portion 36 is formed.

By inserting the annular convex portions 33 of the coupling half portions 31a and 31b into the annular concave portion 22e of the shaft portion 22a so as to sandwich them from both sides, the two annular convex portions 33 are combined to form an annular shape, and the shaft portion 22a It is attached to the annular recess 22e of. By screwing the internal threaded portion 35 of the connecting portion 32 into the first external threaded portion 34 of the coupling half portions 31a and 31b, the two coupling half portions 31a and 31b are integrated, and the connecting portion 30 is integrated. The annular convex portion 33 of the coupling half portions 31a and 31b is rotatably attached to the main body portion 20, that is, the annular concave portion 22e of the diaphragm valve 22.

As shown in FIG. 3, the flow rate control valve device 10 configured in this way is pushed downward by the initial shape of the diaphragm valve 22 in a state where the motor unit is not attached, and a part of the valve body 22b is valved. It is in contact with the seat 24a.

FIG. 4 is a cross-sectional view of the flow rate control valve device 10 integrated with the motor unit via a connecting portion 30 rotatably attached to the main body 20 of the flow rate control valve device 10. The upper surface of the valve box 21 and the diaphragm valve 22 of the flow control valve device 10 and the periphery of the coupling halves 31a and 31b are covered with the upper lid 40. The upper lid 40 is manufactured by grinding a fluororesin member such as PTFE, and has a circular hole 41 in the central portion through which the coupling halves 31a and 31b of the connecting portion 30 are inserted.

The four corners of the upper lid 40 are provided with through holes 42 that communicate with the through holes 26 at the four corners of the valve box 21. A metal or resin fixing screw 50 is inserted through the through hole 26 and the through hole 42 from the lower surface side of the valve box 21, and the motor portion 60 is placed on the upper part of the upper lid 40. Is used for screwing and fixing to the motor unit 60 after adjusting the rotation.

The motor unit 60 is screwed with the stepping motor 61, the casing 62 covering the stepping motor 61, the rotary drive shaft 63 driven by the stepping motor 61, and the rotary drive shaft 63, and the second external screw of the connecting portion 32. An elevating body 64 that is screwed with the portion 36, a bottom plate portion 65 that is fixed to the bottom of the casing 62, and a pair of guide rods 66 that are fixed to the bottom plate portion 65 and guide the elevating body 64 in the vertical direction are provided. There is.

The elevating body 64 may omit the connecting portion 32 of the connecting portion 30 and be directly screwed with the first external screw portion 34 of the coupling half portions 31a and 31b. Further, screw holes 67 communicating with the through holes 26 and the through holes 42 are provided at the four corners of the bottom plate portion 65, and the tip of the fixing screw 50 can be screwed into the screw holes 67.

In the embodiment, the casing 62 is provided so as to cover the stepping motor 61, but the casing 62 may simply fix the stepping motor 61 on the upper lid 40.

An external threaded portion 63a is formed on the outer peripheral portion of the rotary drive shaft 63, a central vertical hole 64a is formed on the central shaft of the elevating body 64, and an internal threaded portion is formed inside the upper and lower ends of the central vertical hole 64a. 64b and 64c are provided, respectively. The internal threaded portion 64b on the upper end side of the elevating body 64 is screwed into the external threaded portion 63a of the rotary drive shaft 63, and the internal threaded portion 64c on the lower end side is screwed with the second external threaded portion 36 of the connecting portion 32. The elevating body 64 is slidable in the vertical direction along the guide rod 66. Then, the elevating body 64 is driven in the vertical direction along the guide rod 66 with the forward / reverse rotation drive of the rotation drive shaft 63.

Explaining the procedure for attaching the motor unit 60 to the flow rate control valve device 10, the upper part of the valve box 21 is covered with the upper lid 40, and the shaft portion 22a of the diaphragm valve 22 and the connecting portion 30 rotatably attached to the valve box 21 Is rotatably inserted into the circular hole 41 provided in the center of the upper lid 40.

Next, the motor portion 60 is placed on the upper lid 40, and the elevating body 64 is screwed onto the rotary drive shaft 63, and the internal thread portion 64c of the elevating body 64 projects upward from the circular hole 41. The second external threaded portion 36 of the connecting portion 32 of the connecting portion 30 is screwed and screwed. In this way, the rotary drive shaft 63 is connected to the connecting portion 30 via the elevating body 64.

Since the connecting portion 30 is rotatably attached to the main body portion 20, the inflow port 23a and the outflow port 23b are predetermined after the second external thread portion 36 is completely screwed into the internal thread portion 64c until the rotation stops. The main body 20 can be rotated in any direction with respect to the connecting portion 30 so as to face the direction.

Then, according to the wiring direction of the connector portion (not shown) of the motor portion 60, the main body portion 20 is set in 90 degree units according to the piping direction of the fluid supply device to which the inflow port 23a and the outflow port 23b should be connected by the fixing screw 50. After rotating in a predetermined direction with, the main body 20 and the motor 60 are screwed and fixed by the fixing screws 50.

A fixing screw 50 is communicated from the lower surface side of the valve box 21 through the through hole 26 of the valve box 21, the through hole 42 of the upper lid 40, and the screw hole 67, and the valve box 21 and the motor portion 60 are screwed to each other so as not to rotate. Stop and fix. In this way, with the inflow port 23a and the outflow port 23b of the valve box 21 of the main body 20 facing in a predetermined direction, the flow rate control valve device 10 and the motor unit 60 are integrated, and the motor of the flow rate control valve device 10 is integrated. The attachment work to the part 60 is completed.

Explaining the operation of the flow control valve device 10 to which the motor unit 60 is attached, the rotational movement of the rotary drive shaft 63 of the stepping motor 61 is converted into the vertical movement of the elevating body 64 by interposing a screw. In this case, the elevating body 64 is restricted from moving in the rotational direction by the guide rod 66, and is allowed to move only in the vertical direction. The vertical movement of the elevating body 64 is transmitted to the connecting portion 30, and the connecting portion 30 moves in the vertical direction. The coupling half portions 31a and 31b pull up and down the diaphragm valve 22 via the shaft portion 22a by this vertical movement.

That is, when the valve body 22b of the diaphragm valve 22 is pulled up, the flow path portion 24 is in an open state as shown in FIG. 4, and when the valve body 22b is pushed down, the flow path portion 24 is opened as shown in FIG. It becomes a blocked state. At that time, the diaphragm film 22c is greatly deformed, but since the peripheral edge of the diaphragm film 22c is fixed to the valve box 21, high sealing performance can be maintained.

In the embodiment, the connecting portion 30 and the elevating body 64 are separate members, but the connecting portion 30 may be provided with the function of the elevating body 64.

As described above, according to the flow rate control valve device 10 according to the present invention, the inflow port 23a and the outflow port 23b of the main body 20 are directed in a predetermined direction with respect to the motor unit 60 while maintaining the sealing property of the diaphragm valve 22. It is possible to keep the state. Therefore, it is possible to save space in the housing including the flow rate control valve device 10 in consideration of the wiring direction of the motor unit 60 and the like.

10 Flow control valve device 20 Main body 21 Valve box 22 Diaphragm valve 22a Shaft 22b Valve body 22e Ring recess 23a Inlet 23b Outlet 24 Flow path 30 Connection 31a, 31b Coupling half 32 Connection 33 Ring convex 40 Top lid 50 Fixing screw 60 Motor part 61 Stepping motor 63 Rotation drive shaft 64 Elevator

Claims (6)

A flow rate control valve device comprising a main body and a connecting portion of a motor portion that is rotatably attached to the main body and has an elevating body that moves up and down and is integrated with the elevating body.
The main body is fixed to a valve box having a flow path portion that connects a pair of pipe bodies serving as fluid inlets and outlets from the side and communicates with each other inside, and the valve box. A flow rate control valve device comprising a diaphragm valve that changes the cross-sectional area of the flow path portion by pushing and pulling the valve body at the lower end of the shaft portion to adjust the flow rate of the passing fluid. The flow rate control valve device according to claim 1, wherein the diaphragm valve has an annular recess above the shaft portion, and the connecting portion has an annular convex portion that rotatably connects the annular recess. .. The connecting portion has a coupling half portion divided into two, and the coupling half portion is integrated to form the annular convex portion at the lower portion and has a first external thread portion on the upper outer peripheral surface. The flow rate control valve device according to claim 2, further comprising a connection portion. The connecting portion further has a connecting portion, and the connecting portion is formed with an internal threaded portion screwing with the first external threaded portion at the lower portion, and a second external threaded portion is formed on the upper outer peripheral surface. The flow rate control valve device according to claim 3, wherein the flow control valve device is formed. The flow rate adjustment according to claim 3 or 4, wherein the external screw portion is screwed with an internal screw portion provided inside the lower end of the central shaft of the elevating body to be connected to the motor portion. Valve device. The valve box is provided with through holes that penetrate vertically, and by communicating a fixing screw through the through holes and the fixing holes of the motor portion, the valve box cannot rotate with respect to the motor portion. The flow rate control valve device according to any one of claims 1 to 5, wherein the flow control valve device is fixed to.

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