JP4081592B2 - 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]
A conventional constant flow solenoid valve is disclosed in Japanese Patent Application Laid-Open No. 11-280937, which is filed by the present applicant.
An inflow port and an outflow port from the upstream side to the downstream side of the valve body communicated by the first flow path, the valve seat, the second flow path, and the flow path including the jet; A diaphragm sandwiched between a valve body recess and a cover covering the valve body, and divided into a fluid pressure receiving chamber and an atmosphere chamber; a diaphragm spring in the atmosphere chamber for pressing the diaphragm toward the fluid pressure receiving chamber; A valve portion that opens and closes the valve seat in the vicinity of the upper end, and is disposed so as to be movable through the second flow path including the seat, with its upper end facing the lower end of the movable core of the electromagnetic device, A control rod whose lower end is locked to the diaphragm;
A control rod spring that urges the valve portion of the control rod to close the valve seat; and a fluid introduction path for introducing the fluid flowing through the second flow path between the valve seat and the jet into the fluid pressure receiving chamber; When the electromagnetic device is de-energized, the valve seat of the control rod is closed and held by the spring force of the movable core spring, and when the electromagnetic device is energized, the spring force of the movable core spring against the control rod Is released.
[0003]
[Problems to be solved by the invention]
Such a conventional constant flow solenoid valve has the following problems.
First, the fluid flowing in from the inflow port flows into the bottom of one side of the movable core housing hole via the first flow path, and then flows into the valve seat.
According to the above, since the fluid pressure acts on the side wall of the valve portion arranged in the movable core housing hole, the lateral load acts on the control rod formed integrally with the valve portion. .
When a lateral load acts on the control rod, a frictional force is generated between the control rod and the control rod that is slidably supported in the second flow path, and the sliding resistance increases. This will interfere with the operation of the control rod.
On the other hand, the control rod has a balance between the spring force of the control rod spring that presses the control rod downward and the spring force of the diaphragm spring that presses the control rod upward when the electromagnetic device is energized. Although the position is set, as described above, if the sliding resistance of the control rod increases, it becomes difficult to adjust the fluid pressure flowing in the second flow path to a predetermined constant pressure. As a result, accurate constant flow control of the fluid cannot be performed.
Secondly, the control rod spring is contracted between the upper end of the valve portion and the lower end of the movable core. According to this, the assembly workability cannot be improved.
That is, in the control rod provided with the valve portion, the lower portion of the control rod is inserted and disposed in the second flow path, and then the valve portion is disposed in the movable core storage port.
Next, a control rod spring is disposed at the upper end of the valve portion, and a lower end of the movable core of the electromagnetic device is disposed at the upper end of the control rod spring. In this state, the electromagnetic device is attached to the valve body.
According to the above, it is not possible to improve the workability of assembling the control rod spring.
[0004]
The constant flow solenoid valve according to the present invention is made in view of such a problem, and provides a constant flow solenoid valve capable of improving the dynamic characteristics of a conventional control rod and achieving accurate constant flow control. The other purpose is to achieve the improvement of assembly workability.
[0005]
[Means for achieving the object]
In order to achieve the above object, the constant flow solenoid valve according to the present invention is configured such that the valve body has a first flow path having an inlet at the left end;
A second flow path opening with an outlet at the right end;
A valve body storage chamber having a valve hole formed in a valve seat having an upper end opening formed separately and opening the first flow path, and a lower end having an opening and opening the second flow path;
A diaphragm that is below the valve body and is divided into a fluid pressure receiving chamber that communicates with the second flow path through the fluid introduction path and an atmosphere chamber, and is urged toward the fluid pressure receiving chamber by a diaphragm spring;
An electromagnetic device that is above the valve body and includes a valve portion that opens and closes the valve hole of the valve seat, and
On the other hand, a needle valve having a tapered valve portion for opening and closing the opening of the second flow path is disposed in the valve body storage chamber, and the needle valve is contracted in the valve body storage chamber, one end of which is a valve. The valve body spring that is locked to the seat is urged toward the opening side and its lower end is placed in contact with the diaphragm,
Further, the longitudinal axis of the valve hole, the valve body storage chamber, the needle valve, and the opening of the second flow path is arranged on the same axis .
[00 06 ]
[Action]
According to the constant flow solenoid valve of the present invention, the fluid flowing from the first flow path through the valve hole of the valve seat into the valve body storage chamber flows toward the center of the valve body storage chamber, and this fluid flows all over the valve body. It enters into the opening of the second flow path while uniformly encircling the circumference.
Therefore, the lateral fluid pressure that is offset from the valve body in the valve body storage chamber does not act, and the sliding resistance with respect to the needle valve can be maintained uniformly and is not increased.
The valve body spring is disposed on the valve body portion in the valve body storage chamber, and the valve body spring is closed between the valve seat and the valve body portion by closing the upper opening of the valve body storage chamber with the valve seat. It can be arranged in a contracted manner.
[00 07 ]
【Example】
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 body in which an inlet 1A is opened at the left end and an outlet 1B is opened at the right end. The first flow path 2 connected to the inlet 1A reaches the vicinity of the center of the side of the valve body 1 and faces upward. Further, a valve body recess 1 </ b> C is provided below the valve body 1.
A valve body storage chamber 3 that opens upward toward the upper first flow path 2 is recessed at a substantially central portion on the side of the valve body 1, and further, from the bottom of the valve body storage chamber 3. A second flow path 4 is drilled toward the valve body recess 1C. That is, the second flow path 4 opens into the valve body storage chamber 3 with the opening 4A.
The longitudinal axis of the second flow path 4 that opens to the valve body storage chamber 3 and the valve body storage chamber 3 is formed on the same line and in the vertical direction.
The second flow path 4 is branched from the lower side of the opening 4A toward the right side, and a jet 5 is arranged at the downstream end of the second flow path 4 to the side. 5 opens to the outflow port 1B.
[00 08 ]
Reference numeral 6 denotes a diaphragm made of a rubber plate material disposed at the lower end of the valve main body 1 so as to cover the opening of the valve main body concave portion 1C. The diaphragm 6 is sandwiched between the lower end of the valve main body 1 and the bottomed cup-shaped cover 7. The According to the above, the valve body recess 1C of the valve body is closed by the diaphragm 6 to form the fluid pressure receiving chamber A, and the cover 7 and the diaphragm 6 form the atmosphere chamber B. The diaphragm 6 is sandwiched between an upper retainer and a lower retainer, and a screw member 8 is screwed to the cover 7.
9 is a diaphragm spring which is mounted under compression inside the air chamber B, the upper end is locked to the diaphragm 6 via the lower retainer, its lower end is locked to the screw member 8 through a lower retainer.
Further, the fluid pressure receiving chamber A and the second flow path 4 are connected by a fluid introduction path 10, and the fluid pressure in the second flow path 4 is introduced into the fluid pressure receiving chamber A.
[00 09 ]
Reference numeral 11 denotes a needle valve, which includes a valve body portion 11B having a tapered valve portion 11A, a small-diameter relief portion 11C and a sliding portion 11D that are continuously provided downward from the valve body portion 11B.
Reference numeral 12 denotes a valve seat disposed in an upper opening of the valve body storage chamber 4 toward the first flow path 2, and a valve hole 12 </ b> A is formed in the valve seat 12.
[00 10 ]
S is an electromagnetic device, and a movable core 15 that urges the movable core 15 to move away from the fixed core 14, the fixed core 14 inside the cylindrical coil 13, the movable core 15 that contacts and separates from the fixed core 14, and the movable core 15. A core spring 16.
[00 11 ]
Next, assembly of the constant flow solenoid valve will be described.
The electromagnetic device S is subassembled in advance. Further, the diaphragm 6 is screwed and fixed onto the valve body recess 1C of the valve body 1 by the cover 7, whereby the fluid pressure receiving chamber A and the atmosphere chamber B are formed in advance.
Next, the needle valve 11 is inserted and arranged from the upper opening of the valve body storage chamber 3, and at this time, the small-diameter escape portion 11 </ b> C and the sliding portion 11 </ b> D are opened in the valve body storage chamber 3 with the opening 4 </ b> A. The valve body portion 11B is disposed in the valve body storage chamber 3, and the tapered valve portion 11A of the valve body portion 11B faces the opening portion 4A of the second flow path 4 at this time. It is arranged with.
Next, a valve body spring 17 is arranged toward the valve body portion 11B in the valve body storage chamber 3, and then the upper opening of the valve body storage chamber 3 is closed by a valve seat 12 having a valve hole 12A.
According to the above, the lower end of the valve body spring 17 is locked to the valve body portion 11B, the upper end of the valve body spring 17 is locked to the lower end of the valve seat 12, and the needle is pressed downward in the figure to slide. The lower end 11E of the portion 11D is disposed facing the diaphragm 6.
What should be particularly noted here is the second flow path 4 including the longitudinal axis of the valve hole 12A formed in the valve seat 12, the longitudinal axis of the valve body storage chamber 3, and the opening 4A. The longitudinal axis of the needle valve 11 and the longitudinal axis of the needle valve 11 are arranged on the same axial line XX in the vertical direction.
Next, the electromagnetic device S is arranged in the upper opening of the valve body 1 to fix the screw, and according to this, the valve portion 15A provided at the tip of the movable core 15 faces the valve hole 12A of the valve seat 12. Be placed.
This completes the assembly of the constant flow solenoid valve. In the valve main body 1, the inlet 1A-first flow path 2-valve hole 12A-valve element storage chamber 3-opening 4A-second flow path is provided. A flow path of 4-jet 5-outlet 1B is formed.
[00 12 ]
Next, the operation will be described. In a state where the coil 13 of the electromagnetic device S is not energized, the movable core 15 is pressed downward by the spring force of the movable core spring 16, and the valve portion 15A of the movable core 15 closes and holds the valve hole 12A.
According to the above, the fluid supplied from the inlet 1A into the first flow path 2 is blocked by the valve hole 12A, the fluid is not discharged from the outlet 1B, and the valve closed state is maintained.
Next, a description will be given of supplying a fluid by energizing the coil 13 of the electromagnetic device S. When the coil 13 is energized, the movable core 15 moves to the fixed core 14 side against the spring force of the movable core spring 16 due to the magnetic force generated in the coil 13. The hole 12A is held open.
According to the above, the fluid supplied into the first flow path 2 flows to the outlet 1B through the valve hole 12A, the valve body storage chamber 3, the opening 4A, the second flow path 4, and the jet 5.
[00 13 ]
The constant flow control of the fluid is performed as follows.
When the pressure of the fluid flowing into the second flow path 4 is higher than the set fluid pressure, the fluid pressure is introduced into the fluid pressure receiving chamber A through the fluid introduction path 10, and according to this, the diaphragm 6 moves downward against the spring force of the diaphragm spring 9.
According to the downward movement of the diaphragm 9, the needle valve 11 is moved downward by following the diaphragm 6 by the valve spring 17, and the tapered valve portion 11 </ b> A retracts the opening area of the opening portion 4 </ b> A to a small extent. Become. According to the above, the fluid pressure on the upstream side of the jet 5 can be immediately controlled to be lowered to a predetermined constant pressure, and the fluid having a constant pressure passes through the jet 5 having a constant throttle so that the fluid has a constant flow rate. Control can be performed.
[00 14 ]
On the other hand, when the pressure of the fluid flowing into the second flow path 4 is lower than the set fluid pressure, the fluid pressure is introduced into the fluid pressure receiving chamber A through the fluid introduction path 10, thereby The diaphragm 6 moves upward by the spring force of the diaphragm spring 9.
According to the upward movement of the diaphragm 9, the needle valve 11 moves upward following the diaphragm 6, and the tapered valve portion 11A opens a large opening area of the opening 4A. According to the above, the fluid pressure on the upstream side of the jet 5 can be controlled by immediately increasing the fluid pressure to a predetermined constant pressure, and the fluid having a constant pressure passes through the jet 5 having a constant throttle so that the fluid has a constant flow rate. Control can be performed.
[00 15 ]
In the constant flow solenoid valve according to the present invention, attention should be paid to the following.
That is, the fluid that flows into the valve body storage chamber 3 from the valve hole 12A flows from the upper part of the valve body storage chamber 3 along the center direction, and this fluid is directed uniformly downward on the outer periphery of the valve body portion 11B. And flows into the second flow path 4 from the opening 4A.
According to the above, the lateral load in one direction which is offset by the fluid pressure does not act on the needle valve 11, and the sliding resistance against the needle valve 11 can be increased or the sliding resistance can be varied. Absent.
Accordingly, the position of the needle valve 11 is uniquely determined by the downward pressing force of the valve spring 17 and the upward pressing force of the diaphragm spring 9 by the diaphragm spring 9, and the opening of the tapered valve portion 11A is determined. Since the opening area of the portion 4A is controlled, stable and accurate constant flow rate control can be performed.
Further, according to the present invention, the needle valve 11 having the valve body spring 17 can be disposed in advance by fixing the valve seat 12 to the upper opening of the valve body portion storage chamber 3 of the valve body 1. In particular, the assembling workability of the valve spring 17 including the needle valve 11 can be greatly improved.
Further, the valve body spring 17 and the diaphragm 6 including the needle valve 11 can be subassembled in advance in the valve body 1, and an electromagnetic device to be subassembled in advance can be assembled to the valve body 1. According to this, the subassembly is in advance. What is necessary is just to assemble things mutually and this also contributes to the improvement of assembling workability | operativity.
[00 16 ]
【The invention's effect】
As described above, according to the constant flow solenoid valve of the present invention, the longitudinal axis of the second flow channel facing the valve hole, the valve body storage chamber, the needle valve, and the valve body storage chamber is arranged on the same axis. By this, the fluid can flow uniformly on the outer periphery of the valve body portion disposed in the valve body storage chamber in the upper part of the needle, thereby preventing the one-way lateral load from acting on the needle from acting on the needle. As a result, it is possible to provide a constant flow solenoid valve that can suppress an increase in sliding resistance against the needle and obtain uniform sliding resistance, and can control a stable constant flow rate accurately and stably.
Further, according to the fact that the valve body spring is disposed in the valve body storage chamber, the lower end thereof is locked to the valve body portion, and the upper end thereof is locked to the valve seat, the valve body spring including the needle is preliminarily attached to the valve body. Assembling can be performed, which greatly improves the assembly workability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a constant flow solenoid valve according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 2 1st flow path 3 Valve body storage chamber 4 2nd flow path 4A Opening part 5 Jet 6 Diaphragm 11 Needle valve 11A Taper valve part 11B Valve body part 11C Small diameter escape part 11D Sliding part 12 Valve seat 12A Valve hole 17 Valve spring

Claims (1)

The valve body (1) has a first flow path (2) opened with an inlet (1A) at the left end;
A second flow path (4) opening at the right end with an outlet (1B);
A valve hole (12A) drilled in a valve seat (12) whose upper end opening is separately formed opens to the first flow path (2), and a lower end opens to the second flow path (4A) ( 4) a valve body storage chamber (3) that opens to;
It is divided into a fluid pressure receiving chamber (A) that is below the valve body (1) and communicates with the second flow path (4) through the fluid introduction passage (10), and an air chamber (B), and a diaphragm spring ( 9) a diaphragm (6) biased toward the fluid pressure receiving chamber (A) by
An electromagnetic device (S) above the valve body (1) and comprising a valve portion (15A) for opening and closing the valve hole (12A) of the valve seat,
On the other hand, a needle valve (11) having a tapered valve portion (11A) for opening and closing the opening (4A) of the second flow path is disposed in the valve body storage chamber, and the needle valve is placed in the valve body storage chamber. (3) The valve body spring (17), one end of which is contracted in the valve seat (12) and urged toward the opening (4A) side, and its lower end (11E) is diaphragmed ( 6)
Further, the longitudinal axis of the valve hole, the valve body storage chamber (3), the needle valve (11), and the opening (4A) of the second flow path (4) is the same axis (X)-(X) A constant flow solenoid valve characterized by being arranged above .

Images