JP3932520B2 - Constant flow solenoid valve - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a constant flow solenoid valve for supplying a constant flow rate into a secondary flow path even when the pressure of the fluid flowing in the primary flow path fluctuates. Used to supply or stop water to the humidifier in the unit.
[0002]
[Prior art]
The conventional constant flow solenoid valve is a strainer for removing foreign substances contained in the fluid flowing in the flow path. A pressure reducing valve for controlling the pressure of fluid flowing in the flow path to a constant pressure Orifice nipple for feeding the flow rate to a constant flow rate. A solenoid valve that opens and closes the flow path to supply and stop fluid. It consists of
The strainer, the pressure reducing valve, the orifice nipple, and the electromagnetic valve are specially prepared. Each of these components is connected by piping with a nipple, an elbow or the like, and has a constant flow rate electromagnetic valve function as a system configuration.
That is, foreign matter is removed from the fluid flowing into the strainer from the first pipe, and the clean fluid is supplied to the pressure reducing valve through the second pipe.
In the pressure reducing valve, the fluid pressure is controlled to be constant according to the inflowing fluid pressure, and the fluid controlled to the 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 the internal orifice, and a constant flow rate fluid is supplied to the solenoid valve via the fourth pipe.
On the other hand, in the solenoid valve, when the fluid is supplied, the valve seat is opened and the fluid is supplied to the consumption unit via the fifth pipe, and when the liquid supply is stopped, the valve seat is closed and the consumption unit is closed. The incoming fluid supply is stopped.
[0003]
[Problems to be solved by the invention]
Such conventional constant flow solenoid valve system has the following problems.
(1) Strainers, pressure reducing valves, and solenoid valves must have a main body that is a base member of each component, and the strainer body, pressure reducing valve body, and solenoid valve body can be shared. Have difficulty. According to the above, in manufacturing each component, it is difficult to reduce the number of parts, leading to high part costs and high assembly costs, and an inexpensive system cannot be supplied.
(2) Each component is connected by piping with connecting members such as a plurality of nipples, elbows, etc. According to this, it requires a lot of man-hours for connection work, and it is necessary to check for leaks in the connection part, Therefore, the connection work cost is expensive, which is not preferable. In addition, according to the connection, the size is increased particularly in the connection direction, and a compact constant flow solenoid valve system cannot be provided.
(3) Further, when performing maintenance of each component, it is necessary to remove each component from the piping and reattach it, which greatly impairs maintainability.
[0004]
The present invention has been made in view of such problems, and by providing each of the above components in a single main body, the manufacturing cost of the component parts is reduced, the connection workability is improved, the maintainability is improved, and further the size is reduced. An object of the present invention is to provide an inexpensive constant flow solenoid valve capable of achieving the above.
[0005]
[Means for solving the problems]
In order to achieve the above object, the constant flow solenoid valve according to the present invention has an inlet opening at the left end, an outlet opening at the right end, a movable core housing hole opening at the upper end, and a valve element opening at the lower end. A storage recess and a valve seat storage chamber recessed upward from the bottom of the valve body storage recess are formed, and the valve seat storage chamber and the movable core storage hole are communicated with each other through the first flow path. And the valve seat housing chamber are communicated with each other by a second flow path provided with a jet, and the inflow port is opened and communicated with the first core seat formed at the end of the third flow path. With the valve body being made;
A valve seat body including a first through hole that opens from the second valve seat that opens to the upper end toward the lower end, and a second through hole that opens outward from an intermediate portion of the first through hole;
The valve seat body is movably disposed in the first through hole, and has a second valve body that opens and closes the second valve seat at its upper end, and a reduced diameter portion having a smaller diameter than the first through hole in the middle portion. A control rod having;
In the movable core housing hole of the valve body, a movable core of a solenoid valve comprising a coil, a fixed core, and a plunger spring is disposed, and a valve portion at the tip of the movable core is disposed facing the first valve seat,
The valve seat body provided with the control rod is fixedly arranged in the valve seat housing chamber to connect the second through hole and the second flow path, and the control rod is disposed movably on the valve seat body. Two valve bodies are arranged opposite to the second valve seat, and an annular gap formed by the reduced diameter portion and the first through hole is arranged in communication with the second through hole,
Further, by sandwiching a diaphragm between the valve body recess and the cover covering it, a fluid pressure receiving chamber is formed on the valve body recess side and an air chamber is formed on the cover side, and the diaphragm is placed below the valve seat body. Place the protruding lower end of the control rod facing
A diaphragm spring having a spring force stronger than a control rod spring that is contracted in the valve seat housing chamber and biases the second valve body toward the second valve seat in the atmosphere chamber,
Further , the first feature is that the fluid passage is connected to the flow path between the downstream of the second valve seat and the upstream of the jet through the fluid pressure receiving chamber .
[00 06 ]
According to the present invention, in addition to the first feature, the upper end of the diaphragm spring is locked to the diaphragm via the lower retainer, and the lower end of the diaphragm spring is locked to a screw member screwed to the cover. This is the second feature.
[00 07 ]
The present invention, in addition to the first feature, the valve seat body, one end opening to the second through hole and the other end in that a fluid introduction path which is open to the fluid pressure chamber a third Features.
[00 08 ]
[Action]
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 integrated in a housing formed by the valve body and the cover. Can be stored. In addition , since the pressure adjusting portion (corresponding to the pressure reducing valve) is formed by the valve seat body and the control rod disposed inside the valve seat body, the constant flow valves can be compactly assembled.
[00 09 ]
Further, according to the second feature, the spring force of the diaphragm spring can be adjusted by screwing the screw member, and the pressure control action by the second valve body can be variably adjusted.
[00 10 ]
According to the third feature, since the fluid introduction path is formed in the valve seat body, the fluid introduction path can be formed very easily.
[00 11 ]
【Example】
An embodiment of a constant flow solenoid valve according to the present invention will be described below with reference to FIG.
1 is a valve body in which an inlet 1A is opened at the left end, an outlet 1B is opened at the right end, a movable core housing hole 1C is opened at the upper end, and a valve body recess 1D is opened at the lower end.
Further, a valve seat housing chamber 1F is formed on the bottom 1E of the valve body recess 1D, and the upper portion of the valve seat housing chamber 1F is connected to the movable core housing hole 1C via the first flow path 1G. The second flow path 1H connected to the outlet 1B is opened to the side of the valve seat housing chamber 1F.
The first valve seat 2 is opened in the movable core housing hole 1C, and the upstream of the first valve seat 2 is communicated with the inflow port 1A via the third flow path 1J.
According to the above, the inflow port 1A and the outflow port 1B formed in the valve body 1 have the third flow path 1J—the first valve seat 2—the movable core housing hole 1C—the first flow path from the upstream to the downstream. 1G—the valve seat housing chamber 1F—the second flow path 1H.
[00 12 ]
An electromagnetic valve S is disposed at the upper end of the valve body 1.
The electromagnetic valve S includes a fixed core 4 inside the cylindrical coil 3, a movable core 5 that is in contact with and away from the fixed core 4, and a plunger spring that urges the movable core 5 to move away from the fixed core 4. 6 and has a valve portion 7 at the tip of the movable core 5.
The solenoid valve S is disposed at the upper end of the valve body 1 as described above, and the lower portion of the movable core 5 is movably disposed in a movable core housing hole 1C that opens toward the upper end of the valve body 1. The
And the valve part 7 provided in the front-end | tip of the movable core 5 is arrange | positioned corresponding to the 1st valve seat 2 which faces and opens in the movable core accommodation hole 1C, and the 1st valve seat 2 is the valve part 7. Is opened and closed by.
[00 13 ]
Reference numeral 8 denotes a valve seat body fixedly arranged in the valve seat body storage chamber 1F. A male screw provided on the outer periphery of the lower end of the valve seat body 8 is screwed to a female screw provided below the valve seat body storage chamber 1F. Fixed.
The valve seat body 8 has a second valve seat 20 at an upper end thereof, and a first through hole 8A is formed through the second valve seat 20 from the lower end toward the lower end, and is intermediate between the first through holes 8A. A second through hole 8B is bored outward from the portion, and the second through hole 8B communicates with the second flow path 1H of the valve body 1.
[00 14 ]
A control rod 9 is movably disposed in the first through hole 8A of the valve seat body 8. A second valve body 21 for opening and closing the second valve seat 20 is disposed at the upper end of the control rod. The lower end 9A protrudes downward from the valve seat body 8 while being slidably supported by the through hole 8A.
Further, a reduced diameter portion 9B having a diameter smaller than that of the first through hole 8A is provided at an intermediate portion of the control rod 9, and the fluid flowing down the second valve seat 20 is provided with the first through hole 8A and the reduced diameter portion 9B. Flows through the annular gap P formed by the first and second holes 8B.
[00 15 ]
Reference numeral 10 denotes a diaphragm made of a rubber plate material disposed at the lower end of the valve body 1 so as to cover the opening of the valve body recess 1D. The diaphragm 10 is sandwiched between the lower end of the valve body 1 and the bottomed cup-shaped cover 11. The
According to the above, the valve body recess 1D of the valve body 1 is closed by the diaphragm 10 to form the fluid pressure receiving chamber A, and the cover 11 and the diaphragm 10 form the atmosphere chamber B.
The diaphragm 11 is sandwiched between an upper retainer 12A and a lower retainer 12B, and a screw member 13 is screwed to the cover 11.
Reference numeral 14 denotes a diaphragm spring that is contracted in the atmosphere chamber B. The upper end of the diaphragm spring is locked to the diaphragm 10 via the lower retainer 12B, and the lower end is locked to the screw member 13 via the retainer 15.
[00 16 ]
Reference numeral 16 denotes a jet disposed in the second flow path 1H of the valve body 1.
Reference numeral 17 denotes a fluid introduction path that communicates the passage between the downstream of the second valve seat 9 and the upstream of the jet 16 and the fluid pressure receiving chamber A.
The fluid introduction path 17 in this example connects the second flow path 1H and the fluid pressure receiving chamber A.
Reference numeral 18 denotes a control rod spring that presses the control rod 9 toward the atmosphere chamber B, and the spring force of the diaphragm spring 14 is set to be stronger than the spring force of the control rod spring 18. Furthermore, 19 is a strainer, which is disposed at the inlet 1A.
[00 17 ]
According to the above, the inlet 1A and the outlet 1B are connected by the following.
Inlet 1A—third flow path 1J—first valve seat 2—movable core storage hole 1C—first flow path 1G—valve seat body storage chamber 1F—second valve seat 20—first through hole 8A and reduced diameter portion 9B, the gap P, the second through hole 8B, the second flow path 1H, the jet 16, and the outlet 1B. The control rod 9 is pressed upward by the diaphragm spring 14 and pressed downward by the control rod spring 18, and the vertical position of the control rod 9 is determined in a state where both springs are balanced. At this time, the lower end 9A of the control rod 9 abuts on the upper retainer 12A, and the second valve body 21 opens the second valve seat 20 at a constant opening.
[00 18 ]
Next, the operation will be described.
In a state where the coil 3 of the electromagnetic valve S is not energized, the movable core 5 is pressed downward by the spring force of the plunger spring 6, and the valve portion 7 holds the first valve seat 2 closed.
According to the above, the inflow port 1A, the movable core housing hole 1C, and the first flow path 1G are blocked and held, and the fluid is not discharged from the discharge path 1B and the valve closed state is maintained.
In order to facilitate the following description, the control rod 9 is biased upward by the diaphragm spring 14 in the closed state, whereby the second valve body 21 opens the second valve seat 20 at a constant opening. Stabilized in condition.
[00 19 ]
Next, a description will be given of supplying fluid by energizing the coil 3 of the electromagnetic valve S. When the coil 3 is energized, the movable core 5 moves to the fixed core 4 side against the spring force of the plunger spring 6 due to the magnetic force generated in the coil 3, and the valve portion attached to the movable core 6 7 opens the first valve seat 2.
According to the above, the fluid in the third flow path 1J includes the first valve seat 2, the movable core storage hole 1C, the first flow path 1G, the valve seat body storage chamber 1F, the second valve seat 20, the gap P, the second It flows into the outflow port 1B through the through hole 8B, the second flow path 1H, and the jet 16.
Although the flow of the fluid has been described above, the constant flow control of the fluid is performed as follows.
[00 20 ]
That is, the pressure of the fluid flowing through the second valve seat 20 into the flow path upstream of the jet 16 (in other words, the gap P, the second through hole 8B, and the second flow path 1H correspond to this flow path). When the fluid pressure is higher than the set fluid pressure, the fluid pressure is introduced into the fluid pressure receiving chamber A through the fluid introduction path 17, and according to this, the diaphragm 10 moves downward against the spring force of the diaphragm spring 14. Move to.
According to downward movement of the diaphragm 10, the control rod 9 is moved downward following the diaphragm 10 by a control rod spring 18, the second valve body 21 is squeezed reducing the opening area of the second valve seat 20 Will be included.
According to the above, the fluid pressure on the upstream side of the jet 16 can be immediately controlled to be lowered to a predetermined constant pressure, and the fluid having a constant pressure passes through the jet 16 having a constant throttle so that the fluid has a constant flow rate. Control can be performed.
[00 21 ]
On the other hand, when the pressure of the fluid flowing into the flow path upstream of the jet 16 via the second valve seat 20 is lower than the set fluid pressure, the fluid pressure is fluidized via the fluid introduction path 17 as described above. The diaphragm 10 is introduced into the pressure receiving chamber A. According to this, the diaphragm 10 moves upward by the spring force of the diaphragm spring 14 against the spring force of the control rod spring 18.
According to the upward movement of the diaphragm 10, the control rod 9 follows the diaphragm 10 and moves upward, so that the second valve body 21 greatly opens the opening area of the second valve seat 20.
According to the above, the fluid pressure on the upstream side of the jet 16 can be immediately increased to a predetermined constant pressure and controlled, and a fluid having a constant pressure passes through the jet 16 having a constant throttle so that the fluid has a constant flow rate. Control can be performed.
[00 22 ]
The spring force of the diaphragm spring 14 can be set by screwing the screw member 13.
That is, the set spring force of the diaphragm spring 14 can be increased by tightening the screw member 13, and the spring force of the diaphragm spring can be decreased by loosening the screw member 13.
As described above, the pressure of the fluid in the flow path upstream of the jet 16 can be appropriately set and adjusted, and the versatility of a single constant flow solenoid valve can be enhanced.
Further, the diaphragm spring 14 has a load variation at the time of manufacture, but the load variation can be completely suppressed by adjusting the screw member 13, and a highly accurate constant flow rate control can be performed.
[00 23 ]
In addition, the valve body 1 is provided with a valve seat housing chamber 1F, and the valve seat body 8 having a function of controlling pressure is fixedly disposed in the valve seat body housing chamber 1F, and the control rod 9 is movable to the valve seat body 8. The first through hole 8A opening from the second valve seat 20 at the upper end toward the lower end, and the second through hole 8A and the second flow path 1H are communicated with the valve seat body 8. The first control rod 9 is provided with a second valve body 21 that opens and closes the second valve seat 20, and the lower end abuts against the diaphragm 10 via the upper retainer 12A. Since the reduced diameter portion 9B for forming the annular gap P is provided, the pressure control function can be arranged on the same axial center line, which is effective for making the constant flow solenoid valve compact.
[00 24 ]
Furthermore, when the fluid introduction path 17 is drilled from the lower end of the valve seat body 8 toward the second through hole 8B (this fluid introduction path 17 is indicated by a dotted line in FIG. 1). Since the valve seat body 8 can be processed and formed at the same time, the manufacturing cost can be reduced as compared with the case where the valve body 1 is provided with the fluid introduction path 17.
[00 25 ]
Further, when the strainer 19 is disposed in the third flow path 1J or the inlet 1A upstream of the first valve seat 2 of the electromagnetic valve S, the first valve seat 2, the second valve seat 20, and the jet 16 are arranged. Foreign fluid is not contained in the fluid to be directed, and a clean fluid can always be supplied. Especially in the first valve seat 2, the valve closing property can be stably maintained over a long period of time, and the second valve In the seat 20 and the jet 16, the throttle portion is not blocked by the foreign matter, and the opening area can be accurately controlled.
[00 26 ]
【The invention's effect】
As described above, according to the constant flow solenoid valve of the present invention, the inflow opening that opens to the left end, the outflow opening that opens to the right end, the movable core storage hole that opens to the upper end, and the valve body storage recess that opens to the lower end A valve seat housing chamber recessed upward from the bottom of the valve body housing recess, and the valve seat housing chamber and the movable core housing hole are connected through a first flow path, and the outlet and the valve seat The body storage chamber is communicated with the second flow path provided with the jet, and the inflow port has a first valve seat formed at the end of the third flow path and is opened to communicate with the movable core accommodation hole. With the body;
A valve seat body including a first through hole that opens from the second valve seat that opens to the upper end toward the lower end, and a second through hole that opens outward from an intermediate portion of the first through hole;
The valve seat body is movably disposed in the first through hole, and has a second valve body that opens and closes the second valve seat at its upper end, and a reduced diameter portion having a smaller diameter than the first through hole in the middle portion. A control rod having;
In the movable core housing hole of the valve body, a movable core of a solenoid valve comprising a coil, a fixed core, and a plunger spring is disposed, and a valve portion at the tip of the movable core is disposed facing the first valve seat,
The valve seat body provided with the control rod is fixedly arranged in the valve seat housing chamber to connect the second through hole and the second flow path, and the control rod is disposed movably on the valve seat body. Two valve bodies are arranged opposite to the second valve seat, and an annular gap formed by the reduced diameter portion and the first through hole is arranged in communication with the second through hole,
Further, by sandwiching a diaphragm between the valve body recess and the cover covering it, a fluid pressure receiving chamber A is formed on the valve body recess side, and an air chamber is formed on the cover side, and the diaphragm is below the valve seat body. The lower end of the control rod protruding to
A diaphragm spring having a spring force stronger than a control rod spring that is contracted in the valve seat housing chamber and biases the second valve body toward the second valve seat in the atmosphere chamber,
Furthermore, since the flow path between the downstream of the second valve seat and the upstream of the jet and the fluid pressure receiving chamber are communicated by the fluid introduction path, the number of parts can be greatly reduced, and a compact and inexpensive constant flow solenoid valve can be provided.
Further, since all the functions are arranged in a single housing, the number of connecting pipes can be reduced. According to this, the number of pipes can be reduced and the pipe connecting work can be reduced.
Furthermore, 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 the maintenance workability can be greatly improved. .
[00 27 ]
In addition, according to the fact that the lower end of the diaphragm spring is locked to the screw member screwed to the cover, the pressure of the fluid upstream of the jet can be appropriately set and adjusted, and its versatility can be enhanced. The set spring force of the diaphragm spring can be adjusted accurately and high-precision constant flow control can be performed.
[00 28 ]
Also, the second valve seat, the first through hole and the second through hole are provided in the valve seat body fixedly arranged in the valve seat housing chamber, and the second valve is provided in the control rod movably arranged in the valve seat body. When the body and the reduced diameter portion are provided and the lower end of the control rod is brought into contact with the diaphragm, it is preferable to make the constant flow solenoid valve compact.
[00 29 ]
Furthermore, when the fluid introduction path is provided in the valve seat body, the manufacturing cost of the fluid introduction path can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a constant flow solenoid valve of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 1A Inflow port 1B Outlet 1D Valve body recessed part 1E Bottom part of fluid pressure receiving chamber 1F Valve seat body storage chamber 1G 1st flow path 1H 2nd flow path 2 1st valve seat 8 Valve seat body 8A 1st through-hole 8B Second through hole 9 Control rod 9B Reduced diameter portion 10 Diaphragm 11 Cover 14 Diaphragm spring 16 Jet 20 Second valve seat 21 Second valve body

Claims (3)

An inflow port 1A that opens to the left end, an outflow port 1B that opens to the right end, a movable core storage hole 1C that opens to the upper end, a valve body storage recess 1D that opens to the lower end, and a bottom 1E of the valve body storage recess 1D The valve seat body storage chamber 1F is formed in a recess, the valve seat body storage chamber 1F and the movable core storage hole 1C are connected to each other through the first flow path 1G, and the outlet 1B and the valve seat body storage chamber 1F. Are connected to each other by the second flow path 1H including the jet 16, and the inflow port 1A has a first valve seat 2 formed at an end of the third flow path 1J and opens to the movable core housing hole 1C. A valve body 1 to be operated;
A valve having a first through hole 8A that opens from the second valve seat 20 that opens to the upper end toward the lower end, and a second through hole 8B that opens outward from the middle portion of the first through hole 8A. Sitting body 8;
The valve seat body 8 is movably disposed in the first through hole 8A, and has a second valve body 21 that opens and closes the second valve seat 20 at the upper end thereof, and has a smaller diameter than the first through hole 8A in the middle portion. A control rod 9 having a reduced diameter portion 9B;
The movable core 5 of the electromagnetic valve S including the coil 3, the fixed core 4, and the plunger spring 6 is disposed in the movable core housing hole 1C of the valve body, and the valve portion 7 at the tip of the movable core 5 is disposed as the first valve. Place it facing the seat 2,
The valve seat body 8 having the control rod 9 is fixedly disposed in the valve seat body storage chamber so that the second through hole 8B and the second flow path 1H are connected to each other and the valve seat body 8 is movably disposed. The second valve body 21 of the control rod 9 is disposed opposite to the second valve seat 20, and an annular gap P formed by the reduced diameter portion 9B and the first through hole 8A is connected to the second through hole 8B. Place and
Further, by sandwiching a diaphragm 10 between the valve body recess and the cover 11 covering it, a fluid pressure receiving chamber A is formed on the valve body recess 10 side, and an air chamber B is formed on the cover 11 side, and the diaphragm is formed in the diaphragm. The lower end 9A of the control rod 9 projecting downward from the valve seat body 8 is disposed oppositely,
A diaphragm spring 14 having a spring force stronger than that of the control rod spring 18, which is contracted in the valve seat housing chamber 1 </ b> F and biases the second valve element 21 toward the second valve seat 20, is contracted in the atmosphere chamber. And
Further, the constant flow solenoid valve characterized in that the fluid pressure receiving chamber 17 communicates the flow path between the downstream of the second valve seat 20 and the upstream of the jet 16 with the fluid pressure receiving chamber A.   The constant flow rate according to claim 1, wherein the upper end of the diaphragm spring is locked to the diaphragm 10 via the lower retainer 12B, and the lower end of the diaphragm spring 14 is locked to a screw member 13 screwed to the cover 11. solenoid valve. The valve seat body, one end opening to the second through hole 8B, the constant flow valve according to claim 1, wherein the other end provided with a fluid introduction path 17 that is open to the fluid pressure chamber A.

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