JP2006071075A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve capable of immediately opening and closing the valve fully when pressure reaches predetermined pressure and having high response property. <P>SOLUTION: This check valve 1 has a lid member 30 connected with a valve main body 10 in a screw part 20. The lid member 30 is provided with a flow-in passage 32 for water W<SB>1</SB>, a valve seat 36, and a valve chamber 34. A conical spring 50 is arranged in a supporting spring storage chamber 14 of the valve main body 10 to support an inversion plate 60. The inversion plate 60 is joined with a valve element 40. When force by pressure of flowing-in water exceeds total of force of the inversion plate and spring force of the conical spring, the inversion plate 60 is inverted downward, the valve is opened, and water flows downward from a flow-out passage 12. When flowing-in force is reduced, the conical spring 50 inverts the inversion plate 60 upward to close the valve. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a highly responsive check valve.

There is a need for a check valve that uses a check valve as an alternative to a solenoid valve and opens and closes completely when a predetermined pressure is reached.
For example, the following patent document discloses a check valve.
This type of valve is equipped with a coil spring, and the valve is opened and closed in proportion to the pressure and the number of springs of the coil spring.
Unlike air, the control of water has a problem that it takes time until the coil spring is fully closed because the coil spring opens minutely even at a constant pressure due to the resistance of flowing water.
JP 2002-81563 A

  An object of the present invention is to provide a highly responsive check valve capable of immediately opening and closing a valve when a predetermined pressure is reached.

  In order to achieve the above-described object, the check valve of the present invention includes, as basic means, a lid member including a water inflow passage, a valve seat, and a valve chamber, and a valve body that is slidably inserted into the valve chamber. A valve main body having a water outflow passage connected to the lid member and a support spring accommodating chamber, a support spring for biasing the valve element disposed in the valve main chamber toward the valve seat, and a valve A reversing plate abutted between the body and the support spring and sandwiched between the valve body and the lid member. The reversing plate generates a force in a direction for urging the valve body toward the valve seat when the valve is closed, and generates a force in a direction for compressing the support spring when the valve is opened.

  Further, when the force acting on the valve body from the inflow passage side becomes larger than the total force of the reversing plate force and the support spring force, the compressed support spring force is applied from the inflow passage side to the valve body. The valve is closed when the total force of the force acting on and the force of the reversing plate becomes larger.

  Furthermore, the force of the compressed support spring can be set larger than the force of the reversing plate.

  Since the check valve of the present invention assists the valve opening and closing operation by the reverse plate, a highly responsive check valve can be obtained. Moreover, reliable valve opening and closing are achieved, and water leakage and the like are reliably prevented.

FIG. 1 is an explanatory view showing a closed state of the check valve of the present invention.
The check valve generally indicated by reference numeral 1 has a valve body 10 and a lid member 30 that is screwed to the valve body 10 by a screw portion 20.
The lid member 30 includes a water inflow passage 32 and a valve chamber 34, and a valve seat 36 is formed at a connection portion between the inflow passage 32 and the valve chamber 34.

The valve body 10 includes a water outflow passage 12 and a support spring accommodating chamber 14. A conical spring 50 that is a support spring is accommodated in the accommodation chamber 14. The lower surface of the reversing plate 60 sandwiched between the valve body 10 and the lid member 30 is supported by a conical spring 50.
The valve body 40 inserted into the valve chamber 34 of the lid member 30 is supported by the reversing plate 60 and moves up and down in the valve chamber 34. A seal member 44 made of rubber or the like is attached to the tip of the valve body 40 and comes into contact with the valve seat 36.
A fluid W ₁ such as water flows into the inflow passage 32 of the lid member 30 of the check valve 1, but the closed state is maintained until a predetermined pressure is reached.

FIG. 2 is an explanatory view of members constituting the check valve of the present invention.
The lid member 30 is made by molding plastic and has a fluid inflow passage 32 and a valve chamber 34, and a valve seat 36 is formed. The valve element moves up and down along the inner peripheral wall surface of the valve chamber 34. A male screw portion 20a that is screwed into the valve body is formed on the outer peripheral portion.

  The valve body 40 is also made of a plastic material and has a cylindrical portion 41 and a tapered portion 46. A sliding portion 42 having a large outer peripheral dimension and a small outer peripheral portion 43 are formed on the flange portion. The sliding portion 42 slides against the inner peripheral wall surface of the lid member 30, and a fluid passage is formed between the sliding portion 42 and the outer peripheral portion 43 having a small diameter. A seal member 44 such as an O-ring is inserted into a groove provided in the tapered portion 46 to form an on-off valve with the valve seat.

  The reversing plate 60 is made of an elastic metal plate, and the reversing portion 60a having the reversing portion 60a and the peripheral mounting portion 60b is provided with an opening 62 serving as a fluid passage. In the illustrated embodiment, four round holes are provided, but the shape and number of openings can be designed appropriately.

The conical spring 50 is made of an elastic material such as spring steel, the lower end portion 50 a abuts on the valve body 10, and the upper end portion 50 b abuts on the reversing plate 60.
The valve body 10 is made of plastic and has a fluid outflow passage 12 and a storage chamber 14 for a conical spring 50.
A groove 16 for receiving the lower end portion 50a of the conical spring is formed in the bottom surface of the conical spring accommodating chamber 14, and a female screw portion 20b is formed in the inner peripheral portion of the upper portion.

Next, the operation of the check valve of the present invention will be described.
In FIG. 3, when the pressure of the water W ₁ flowing from the inlet 32 of the check valve 1 is P, and the pressure receiving area of the valve body 40 in the closed state is A, the force F in the valve opening direction applied to the valve body 40 _A is
F _A = P × A
It becomes.

Then, the force to push up the valve body 40 of the reversing plate 60 and _{F B,}
If the force generated by the spring length of the conical spring 50 in the closed state is F _C ,
_{F A} ≦ F B + F _C
During this period, the valve is kept closed.

The pressure P of the water W ₁ flowing rises,
F _A > F _B + F _C
Then, valve opening is started. Immediately after the opening of the valve, the reversing plate 60 reverses downward and opens to the state shown in FIG.
The inflowing water W ₁ passes through the opening of the outer peripheral portion of the valve body 40 and the opening of the reversing plate 60 and flows out from the outflow passage 12 as the water flow W ₂ .

When the valve is opened, the pressure receiving area on the inlet side changes. If this pressure receiving area is A ′,
F ′ _A = P × _A ′
It becomes.
Force F _B which reversing plate 60 is generated will vary upwards vector from the downward force is not changed.

The conical spring 50 is compressed and its spring force increases. When the force of the conical spring 50 in the compressed state is F ′ _C ,
F ′ _A + F _B ≧ F ′ _C
During this period, the valve is kept open.
The pressure P of the water flowing into the check valve decreases,
F ′ _A + F _B <F ′ _C
The reversing plate 60 is reversed upward by the spring force of the conical spring 50, and pushes up the valve body 40. The seal member 44 of the valve body 40 is pressed by the valve seat 36 and immediately closes.

In the check valve of the present invention,
F _B <F ' _C
If set to
F ′ _A = 0
That is, P = 0
But it can be closed.

As described above, in the check valve of the present invention, the operation time between the fully closed state and the fully opened state is short, and the responsiveness is excellent.
In addition, the sealing performance in the closed state is high, and problems such as leakage can be prevented.

Explanatory drawing which shows the valve opening state of the non-return valve of this invention. Explanatory drawing of the member which comprises the non-return valve of this invention. Explanatory drawing which shows the effect | action of the check valve of this invention. Explanatory drawing which shows the effect | action of the check valve of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Check valve 10 Valve main body 20 Screw part 30 Lid member 40 Valve body 50 Conical spring 60 Inversion plate

Claims (4)

A valve body comprising a water inflow passage, a valve member having a valve seat and a valve chamber, a valve body slidably inserted into the valve chamber, a water outflow passage connected to the lid member, and a housing chamber for a support spring And a support spring that urges the valve body disposed in the storage chamber of the valve body toward the valve seat, and a reverse that is abutted between the valve body and the support spring and sandwiched between the valve body and the lid member With a board,
The reversing plate is a check valve that generates a force in a direction to urge the valve body toward the valve seat when the valve is closed, and generates a force in a direction to compress the support spring when the valve is opened.   The valve opens when the force acting on the valve body from the inflow passage side becomes greater than the total force of the reversing plate and the support spring, and the compressed support spring force acts on the valve body from the inflow passage side. 2. The check valve according to claim 1, wherein the check valve is closed when the total force of the force to be applied and the force of the reversing plate becomes larger.   The check valve according to claim 1, wherein the force of the compressed support spring is set larger than the force of the reversing plate. The check valve according to claim 1, wherein the support spring is a conical spring.

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