JPH11280945A - Constant flow rate solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost constant flow rate solenoid valve to reduce a manufacturing cost of a constitution part, improve connection workability, improve maintainability, and be formed in a compact manner. SOLUTION: A diaphragm 13 is nipped between a valve body 1 and a cover body 5 and divided into first and second chambers A and B. An inflow passage 11 is opened to a first chamber A and the inflow passage 11 is opened and closed by a solenoid valve S. The first and second chambers A and B are intercoupled through a jet 16, and fluid flowing from the second chamber B containing the jet 16 toward a discharge passage 2 is controlled by a variable throttle part C moved synchronously with the diaphragm 13 moved responding to a pressure difference between the first and second chambers A and B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant flow solenoid valve for supplying a constant flow rate to the secondary flow path even when the pressure of the fluid flowing in the primary flow path fluctuates. For example, it is used for supplying or stopping water to a humidifier or the like in a fan coil unit.

[0002]

2. Description of the Related Art A conventional constant flow solenoid valve is a strainer for removing foreign substances contained in a fluid flowing in a flow passage. Pressure reducing valve for controlling the pressure of the fluid flowing in the flow path to a constant pressure.
Orifice nipple for reducing the flow rate to a constant flow rate. An electromagnetic valve that opens and closes the flow path to supply and stop fluid. The strainer, the pressure reducing valve, the orifice nipple, and the solenoid valve are specially prepared, and their respective components are connected by piping with nipples, elbows, etc., and have a constant flow rate solenoid valve function as a system configuration. In other words, foreign matter is removed from the fluid flowing into the strainer from the first pipe by the strainer, and the clean fluid is supplied to the pressure reducing valve via the second pipe. In the pressure reducing valve, the fluid pressure is controlled to be constant according to the fluid pressure flowing therein, and the fluid controlled to this constant pressure is supplied to the orifice nipple via the third pipe. In the orifice nipple, the flow rate is controlled to a constant flow rate by an internal orifice, and a constant flow rate fluid is supplied to the solenoid valve via the fourth pipe. On the other hand, in the case of the solenoid valve, the valve seat is opened when the fluid is supplied, the fluid is supplied to the consuming unit via the fifth pipe, and the valve seat is closed when the supply of the fluid is stopped. The supply of the incoming fluid is stopped.

[0003]

The conventional constant flow solenoid valve system has the following disadvantages. (1) In the case of the strainer, the pressure reducing valve, and the solenoid valve, a main body serving as a base member thereof is always required in each configuration, and the strainer body, the pressure reducing valve body, and the solenoid valve body may be shared. Have difficulty. According to the above, it is difficult to reduce the number of components in manufacturing each component, resulting in high component costs and high assembly costs, and it is impossible to supply an inexpensive system. (2) Each component is connected by piping with a plurality of connecting members such as nipples, elbows, and the like. According to this, a large number of man-hours are required for connection work, and it is necessary to check for leakage at the connection portion. Therefore, the connection work cost becomes expensive, which is not preferable. Also, according to the above connection, it is not possible to provide a compact constant flow solenoid valve system which is large in the connection direction in particular. (3) Further, when performing the maintenance of each of the above components, it is necessary to remove each of the components from the pipe and reattach the components, which greatly impairs the maintainability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and includes the above-described components in a single main body, thereby reducing the manufacturing cost of components, improving the connection workability, improving the maintainability, and the like. It is an object of the present invention to provide an inexpensive constant flow solenoid valve that can be made compact.

[0005]

In order to achieve the above object, a constant flow rate solenoid valve according to the present invention is sandwiched between a valve body and a cover body, and has a first opening having an inflow passage opening on the cover body side. A diaphragm, which is divided into a chamber and a second chamber connected to the discharge passage on the valve body side; a jet for controlling the fluid in the first chamber to flow into the second chamber; and a diaphragm for pressing the diaphragm toward the first chamber. A spring; a variable throttle section which synchronizes with a diaphragm which is displaced in accordance with a pressure difference between the first chamber and the second chamber, and controls a fluid flowing from the second chamber including the downstream of the jet to the discharge path; A solenoid valve for opening and closing control;
Is a first feature.

In addition, the present invention, in addition to the first feature, further comprises a second inflow passage which opens directly into the first chamber bypassing a valve seat of the inflow passage opened and closed by the solenoid valve. A second feature is that the second inflow path is opened and closed by mechanical opening and closing means.

In addition to the first feature, the present invention further comprises a control rod slidably supported by a guide hole formed in the valve body and integrally slidably supported on the diaphragm. A jet for controlling the fluid in the first chamber to flow into the second chamber, a flow path communicating the second chamber with the lower chamber of the guide hole, and an opening area of the throttle passage opening to the lower chamber with respect to the lower chamber is controlled. A third characteristic is that a control valve portion is provided.

Further, the present invention has a fourth feature in that, in addition to the first feature, a strainer is disposed in an inflow passage upstream of a valve seat of the solenoid valve.

[0009]

According to the first feature of the present invention, the functions of the solenoid valve, the pressure reducing valve, and the constant flow valve which are the main components of the constant flow solenoid valve are provided in the housing formed by the valve body and the cover. It can be stored and arranged integrally.

According to the second feature, the fluid can be supplied from the second inflow passage to the first chamber by the mechanical opening / closing means even when the current cannot be supplied to the electromagnetic device. The function of the constant flow solenoid valve can be achieved even in a state where it is not supplied.

According to the third feature, since the control rod is formed with the jet and the control valve portion, the constant flow rate solenoid valve can be made compact.

According to the fourth feature, the strainer can be easily arranged in the housing formed by the valve body and the cover, and further, clean fluid can be supplied to the valve seat of the solenoid valve and the jet. Can be supplied.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a constant flow solenoid valve according to the present invention will be described below with reference to FIG. Reference numeral 1 denotes a valve main body having an upper end portion 1A at the top, which is composed of the following. The valve body recess 1B is recessed toward the upper end 1A, and the bottom 1 of the valve body recess 1B is formed.
A bottomed cylindrical guide hole 1D is drilled downward from C. A discharge path 2 opens at the right end 1E of the valve body 1, and an upstream side of the discharge path 2 opens near the bottom of the guide hole 1D with a throttle passage 3 having a small diameter. Reference numeral 4 denotes an inflow passage that opens at the left end 1F of the valve body 1, and the inflow passage 4 opens at the upper end 1A of the valve body 1.

Reference numeral 5 denotes a cover body having a lower end portion 5A at the bottom, which is constituted as follows. A cover main body concave portion 5B is recessed toward the lower end portion 5A, and an electromagnetic valve S is disposed at an upper end 5C of the cover main body 5. The solenoid valve S includes a fixed core 7 inside a cylindrical coil 6 and a movable core 8
And a plunger spring 9 for urging the movable core 8 away from the fixed core 7. The movable core 8 has a valve section 10 at its tip. The solenoid valve S is disposed at the upper end 5C of the cover body 5 as described above.
The lower part of the movable core 8 is movably disposed in a movable core storage hole 5D that opens toward the upper end 5C of the cover body 5. The inflow path 11 is opened in the movable core storage hole 5D, and the inflow path 11 is further opened from the bottom of the movable core storage hole 5D via the valve seat 12 toward the cover body recess 5B. Therefore, the valve seat 1 is provided in the cover main body concave portion 5B.
2, the inflow passage 11 is opened.
Is opened and closed by the valve unit 10 attached to the movable core 8 of the solenoid valve S.

Reference numeral 13 denotes a diaphragm formed of a flat rubber material, and a control rod 14 having a columnar shape is disposed at the center of the diaphragm at right angles to the diaphragm 13. In this example, the diaphragm 1 is located above the control rod 14 by a lower retainer 15A, an upper retainer 15B, and a nut 15C.
3 and a guide hole 1 is provided below the control rod 14.
D makes sliding contact. In addition, a jet 16 is drilled in the upper part of the control rod 14, and a first flow path 19 </ b> A is drilled through the jet 16 toward the lower end 14 </ b> A of the control rod 14.
Further, a second flow path 17B is formed so as to open outward from an intermediate portion of the first flow path 17A. Further, the control rod 1
A control valve portion 14B formed of a notch step portion is formed near the lower end 14A of 4.

The above components are assembled as follows. On the upper end 1A of the valve body 1, a control rod 1
The diaphragm 13 provided with 4 is arranged. At this time, the lower part of the control rod 14 is slidably disposed in the guide hole 1D of the valve body 1, and a diaphragm spring 18 is provided between the bottom 1C of the valve body recess 1B and the lower retainer 15A.
Is contracted.

Next, the lower end 5A of the cover main body 5 provided with the solenoid valve S is disposed on the diaphragm 13 disposed on the upper end 1A of the valve main body 1. In this state, the cover main body 5 and the valve main body 1 are connected to each other. Is fixed with fixing means such as screws. This state is shown in FIG. 1, in which the cover main body concave portion 5B of the cover main body 5 is closed by the upper side surface of the diaphragm 13 to form the first chamber A, and the valve main body concave portion 1B of the valve main body 1 is To form a second chamber B.

The control rod 14 integrally attached to the diaphragm 13 passes through the second chamber B, and the lower part thereof is guided by sliding contact with the guide hole 1D.
4A is a lower chamber 1 formed by the bottom of the guide hole 1D.
It is arranged facing E. At this time, the lower end 1 of the control rod 14
4A does not contact the bottom 1F of the lower chamber 1E.

The jet 1 provided above the control rod 14
6 is arranged so as to open into the first chamber A, and a first flow path 17A connected below the jet 16 is provided with the control rod 1.
4 and the lower chamber 1 of the guide hole 1D from the lower end 14A.
Open in E. Also, the second branch branched from the first flow path 17A.
The flow path 17B is opened from the outside of the control rod 14 toward the inside of the second chamber B.

On the other hand, the control valve portion 14B provided below the control rod 14 is disposed facing the throttle passage 3 opened in the guide hole 1D. A part C is formed. That is, the control valve unit 1
As the 4B moves up and down, the opening area of the aperture passage 3 into the guide hole 1D changes, thereby performing the function of a variable aperture.

The inflow passage 4 opening at the left end 1F of the valve main body 1 includes the inflow passage 4 of the valve main body 1 and the inflow passage 1 of the cover main body 5.
1. The movable core storage hole 5D, the valve seat 12, and the first chamber A are communicated via the inflow path 11 downstream of the valve seat 12.

Next, the operation will be described. Solenoid valve S
When the coil 6 is not energized, the movable core 8 is pressed downward by the spring force of the plunger spring 9, and the valve section 10 holds the valve seat 2 closed. According to the above, the inflow path 11 and the first chamber A are shut off and held, so that no fluid is supplied from the discharge path 2 and the valve closed state is maintained. In order to facilitate the following description, in such a closed state, the diaphragm 13 is urged upward by a diaphragm spring 18, whereby the control valve portion 14 B constituting the variable throttle portion C is connected to the throttle passage 3.
Was stabilized in the half-open state. The above state is shown in FIG.

Next, a case in which the fluid is supplied by energizing the coil 6 of the solenoid valve S will be described. When the coil 6 is energized, the movable core 8 moves toward the fixed core 7 against the spring force of the plunger spring 9 due to the magnetic force generated in the coil 6. 10 opens the valve seat 12. According to the above, the inflow channels 4, 11,
The fluid flowing into the movable core housing hole 5D flows into the first chamber A via the valve seat 12 and the inflow path 11A downstream of the valve seat 12, and the fluid filling the first chamber A is jetted. It flows into the first flow path 17 </ b> A in the control rod 14 through 16.
The fluid flowing in the first flow path 17A is
Flows into the second chamber B via the flow path 17B and flows into the lower chamber 1E, and the fluid in the lower chamber 1E flows through the control valve section 14B and the variable throttle section formed by the opening of the throttle passage 3. C flows into the discharge path 2 via C, and then is discharged from the discharge path 2. Although the flow of the fluid has been described above, the constant flow rate of the fluid is controlled by the following.

That is, when the pressure of the fluid flowing into the first chamber A through the valve seat 12 is higher than the set fluid pressure, the first chamber A and the second chamber B generated when passing through the jet 16 are formed. According to this, the diaphragm 13 moves downward against the spring force of the diaphragm spring 18. According to the downward movement of the diaphragm 13, the control rod 14 formed integrally with the diaphragm 13 also moves downward, whereby the control valve portion 14B moves downward and the throttle passage The aperture area of No. 3 is narrowed down. According to the above,
Since the opening area of the throttle passage 3 as the variable throttle portion C can be reduced in accordance with the increase in the pressure of the fluid applied to the first chamber A, the flow rate of the fluid discharged from the discharge passage 2 can be reduced in accordance with the pressure increase. It can be reduced, and can be controlled to a desired constant flow rate.

On the other hand, when the pressure of the fluid flowing into the first chamber A via the valve seat 12 is lower than the set fluid pressure, the first chamber A and the second chamber B generated when passing through the jet 16 are formed.
Is small, and according to this, the diaphragm 13 moves upward by the spring force of the diaphragm spring 18. According to the upward movement of the diaphragm 13, the control rod 14 integrally formed with the diaphragm 13 also moves upward, whereby the control valve portion 14B moves upward and the throttle passage The opening area of No. 3 is largely opened. According to the above, the opening area of the throttle passage 3 as the variable throttle portion C can be increased in accordance with the decrease in the pressure of the fluid applied to the first chamber A.
The flow rate of the fluid discharged from the discharge path 2 can be increased in accordance with the pressure drop, and can be controlled to a desired constant flow rate.

The inflow passage 4 provided in the cover body 5 is connected to the inflow passage 1 on the downstream side of the valve seat 12 without passing through the valve seat 12.
1A, via a second inflow path 20, and the second inflow path 20 may be opened and closed by mechanical opening and closing means 21. The mechanical opening / closing means 21 has a tapered valve portion 21B whose rear end is screwed to the cover main body 5 with a screw portion 21A and which opens and closes the second inflow path 20 at the front end. According to the above, there is a state in which current cannot be supplied to the coil 6 of the solenoid valve S, for example, a state in which the coil 6 is disconnected, a power outage, or a state in which power is not yet provided around the device. Even if the second inflow path 20 is opened by the mechanical opening / closing means 21, the function of the constant flow valve can be achieved.

According to the arrangement of the strainer 22 in the inflow passages 11 and 4 upstream of the valve seat 12 of the solenoid valve S, foreign matters are contained in the fluid flowing toward the valve seat 12, the jet 16 and the variable throttle portion C. It is not included and can always supply a clean fluid. Particularly, in the valve seat 12, the valve closing property can be stably maintained for a long period of time. There is no blockage, and moreover, in the variable throttle section C, the opening area can be accurately controlled.

The control rod 14 attached to the diaphragm 13 has the jet 16, the first flow path 17A, the second flow path 17B, and the control valve portion 14B. The above configuration can be arranged and formed intensively in the axial direction, which is preferable in reducing the size of the constant flow solenoid valve.

FIG. 2 shows another embodiment of the constant flow rate solenoid valve according to the present invention, which differs from the first embodiment in the variable throttle section C. That is, below the control rod 14, there is provided a flower-shaped portion 14G having a flower-shaped cross section constituting a flow path with respect to the guide hole 1D, and a tapered valve portion 14J extending from the flower-shaped portion 14G to the tip. On the other hand, the throttle passage 3 opens at the bottom 1F of the lower chamber 1E. And the flower-shaped part 1 of the control rod 14
4G is slidably guided and held in the guide hole 1D, and the tapered valve portion 14J is inserted and arranged in the throttle passage 3.
4J and the throttle passage 3 form a variable throttle portion C. According to this embodiment, the fluid in the second chamber B flows into the lower chamber 1E through the gap between the guide hole 1D and the flower-shaped portion 14G of the control rod 14, and flows from the lower chamber 1E to the discharge path 2. Is controlled to a constant flow rate by a variable throttle portion C constituted by the tapered valve portion 14J and the throttle passage 3.

[0030]

As described above, according to the constant flow rate solenoid valve according to the present invention, the solenoid valve having the function of opening and closing the flow path and the inside of the flow path are provided in the housing formed by the valve body and the cover body. A pressure response function (diaphragm) that displaces according to the pressure of the flowing fluid and a variable restrictor (control valve and restrictor passage) that controls the flow rate to a fixed amount are provided. Inexpensive constant flow solenoid valve can be provided. Further, since all the functions are arranged in a single housing, the number of connection pipes can be reduced, thereby reducing the number of pipes and the number of pipe connection operations. Further, when performing maintenance work, the constant flow solenoid valve can be taken out by removing the pipe connected to the inflow path and the pipe connected to the discharge path, so that maintenance workability can be greatly improved. .

Further, according to the provision of the second inflow path bypassing the valve seat and the opening and closing of the second inflow path by the mechanical opening / closing means, even when the current cannot be supplied to the solenoid valve. It can function as a constant flow valve.

The control rod attached to the diaphragm includes a jet, a first flow path, a second flow path, a control valve,
Is particularly preferable in that the constant flow solenoid valve is compactly assembled.

According to the arrangement of the strainer in the inflow passage on the upstream side of the valve seat, the housing (valve body, cover body)
The strainer is stored and arranged inside, and it does not require special members and connection piping for arranging the strainer,
Furthermore, the fluid containing foreign matter does not flow toward the valve portion, the jet, and the variable throttle portion of the electromagnetic valve disposed downstream thereof, and the reliability of the configuration can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a constant flow solenoid valve of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the constant flow solenoid valve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 1D Guide hole 1E Lower chamber 2 Discharge path 3 Restriction passage 5 Cover main body 11 Inflow path 12 Valve seat 13 Diaphragm 14 Control rod 16 Jet 20 Second inflow path 21 Mechanical opening / closing means 22 Strainer

Claims (4)

[Claims] 1. A first chamber (A) sandwiched between a valve body (1) and a cover body (5) and having an inflow passage (11) open to the cover body (5).
A diaphragm 13 divided into a second chamber B connected to the discharge passage 2 on the valve body 1 side; and a fluid in the first chamber A to the second chamber B.
A jet 16 which is controlled to flow into the inside; and a diaphragm spring 1 which presses the diaphragm 13 toward the first chamber A side.
8; a variable throttle unit that controls the fluid flowing from the second chamber B including the downstream of the jet 16 to the discharge path 2 in synchronization with the diaphragm 13 that is displaced in accordance with the pressure difference between the first chamber A and the second chamber B. C and a solenoid valve S for electrically controlling opening and closing of the inflow passage 11
And a constant flow solenoid valve comprising: 2. A second valve which opens directly into a first chamber A bypassing a valve seat 12 of an inflow path 11 opened and closed by the solenoid valve.
The constant flow rate solenoid valve according to claim 1, wherein an inflow path (20) is provided, and the second inflow path (20) is opened and closed by a mechanical opening / closing means (21). 3. A control rod 14 slidably supported by a guide hole 1D formed in the valve body 1 is integrally attached to the diaphragm, and the fluid in the first chamber A is applied to the control rod. A jet 16 that is controlled to flow into the second chamber B, a flow path 17A that communicates the second chamber B with the lower chamber 1E of the guide hole 1D,
The constant flow rate solenoid valve according to claim 1, further comprising a control valve portion (14B) for controlling an opening area of the throttle passage (3) opening to the lower chamber (1E) with respect to the lower chamber (1E). 4. The constant flow solenoid valve according to claim 1, wherein a strainer 22 is disposed in the inflow passage 11 upstream of the valve seat 12 of the solenoid valve.