JPS61124785A - Fluid control valve with sealing function - Google Patents

Abstract

PURPOSE:To ensure stable sealing by forming a minute projection on at least any one surface out of a seal ring and either a ring holder or seal wall surface of valve body. CONSTITUTION:A seal ring 20 composed of an elastic material has a spherical surface 21 of which center P lies on the central axis C.L. of a valve seat 12, and a minute projection 29 is formed on it. This seal ring is in contact with the positioning part 19 of a ring holder 22 to maintain a prescribed amount of compression. Even if a valve body 13 should be slanted by the disturbance such as the repeat of the open/shut operation of valve, vibration, etc., the valve seat 12 keeps closely in contact with the spherical surface to ensure a secure sealing function. Further, by dint of the minute projection 29, reduced dimensional tolerance may be allowed for the machining accuracy of parts. The formation of this minute projection 29 on the side 18a or 18b of seal wall surfaces has also the same effect.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is installed in gas combustion appliances, etc.
In other words, regarding fluid control valves that continuously control outlet side gas pressure (flow rate) according to hot water temperature, room temperature, etc. to obtain a desired temperature, in particular, a closing function is added to the fluid control valve with a function to shut off the fluid. The present invention relates to the valve structure of the attached fluid control valve.

Conventional technology A fluid control valve with a closing function is designed to make the fluid control system more compact and cost-effective by omitting a dedicated closing solenoid valve by adding a fluid shutoff function to the fluid control valve.
Some fluid control valves include an elastic member in the valve portion to improve the close contact between the valve seat and the valve body. (For example, Utsukuri
No. 137) This conventional fluid control valve with a closing function is
As shown in the figure, it has a valve body 2 equipped with a permanent magnet 1 as a magnetic body, and a fixed iron core 3 disposed in a position close to the permanent magnet 1, and generates magnetic force in a direction repelling from the permanent magnet 1. A diaphragm 6 that biases the valve body 2 in the valve closing direction in response to the pressure of the fluid inlet 5o is provided, and the electromagnetic repulsion force is controlled by controlling the current applied to the electromagnetic coil 4. , so that the valve body 2 can freely move up and down, and the valve opening degree is controlled by the balance between the fluid pressure acting on the valve body 2 via the diaphragm 6 and the electromagnetic repulsion force, and the fluid pressure is proportionally controlled. has been done.

In the pressure control valve with a closing function configured as described above, when no current is applied, the valve body 2 is closed by the force of the permanent magnet 1 being attracted to the fixed iron core 3, which causes the elastic member 7 attached to the valve body 2 to be pressed against the valve seat 8. However, the fluid passage is blocked. It also has a well-known governor function.

Problems to be Solved by the Invention However, in this conventional example, when the valve is repeatedly opened and closed, or when vibrations, shocks, etc. are applied, the valve body 2 tilts as shown in FIG. This is because the valve body 2 is supported by the diaphragm 6 made of a flexible material.

As a result, the contact surface of the elastic member 7 with the valve seat 8 is in the shape of a circular shape, so that the elastic member 70
The abutting shape is an ellipse as shown in Figure 6,
A small gap is formed between the valve seat 8 and the elastic member 70, resulting in the inconvenience of fluid leakage.

Further, it is difficult to process the elastic member 7 to be integrated with the valve body 2.

In other words, as a means of attaching the elastic member 7 to the valve body 2, adhesive is used.
Integral molding or the like is used, but if adhesive is used, there is a concern that the elastic part 'tt 7 will deteriorate due to the adhesive, and workability is poor. On the other hand, in the case of integral molding, if the elastic member 7 is made of rubber as the material of the valve body 2, it is necessary to select a material having a heat resistance temperature higher than the vulcanization temperature of rubber, and is limited to metals. As a result, turning is required, leading to machining and eco-storing. Furthermore, since the elastic member 7 contracts non-uniformly due to cooling during integral molding, highly accurate roundness cannot be obtained, resulting in poor yield.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems of the prior art, and it provides stability even if the contact position between the elastic member and the valve seat changes due to repeated opening and closing of the valve. The purpose is to improve processability and assemblability as well as to allow for closing.

In order to achieve this object, the fluid control valve with a closing function according to the present invention includes a valve seat provided between a fluid inlet and a fluid outlet, a valve body provided with a sealing wall surface and a positioning part, and a valve seat provided on the central axis of the valve seat. It has a spherical radius surface with a center point at , and is made of an elastic member. a ring holder that contacts the positioning portion and holds the seal ring on the valve body; and a biasing element that biases the valve body to close, the surface of the seal ring facing the ring holder. or a minute protrusion is formed on at least one of the surfaces facing the valve body seal wall, or the sea! A minute protrusion is formed on the valve body seal wall surface facing the railing or on the ring holder, so that the ffI valve seat and the spherical radius surface contact and close.

Operation The present invention has the above-described structure, so that even if the valve body is tilted or the abutment position changes due to repeated valve opening and closing, vibration, impact, etc., the seal ring has a ball whose center point is on the central axis of the valve seat. Since the rounded surface is provided, the valve seat and the ball are always in close contact with each other to ensure stable closing.

In addition, when a valve body trap positioning part is provided and the ring holder is brought into contact with the positioning part, and the seal ring is inserted into the valve body in order to hold the seal ring with a predetermined amount of compression by minute protrusions, the seal ring Stable closing performance can be obtained without changing the sphericity of the rounded surface.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a sectional structural view of a fluid control valve with a closing function according to the present invention, and FIG. 2 shows an enlarged sectional view of the main part of the valve portion. In FIGS. 1 and 2, 9 indicates a fluid population 10 and a fluid outlet 11.
A valve body 13 is provided with a valve seat 12 between the flow 1. A membrane plate 15a is provided above and below with a diaphragm 14 that operates in response to pressure from the entrance 10 side.

The valve body is fixed together with 15b by a pin 16 and a bushing nut 17, and is provided with knoll walls 18a, 18b and a positioning portion 19. 20 is a central axis C of the valve seat 12.
, is a seal ring made of an elastic member that has a ball-I face 21 with a center point PL on L, and has minute protrusions 29 formed thereon, and has an inner diameter smaller than the outer diameter of the sealing wall face 18a. , the seal wall surface 18a is mounted so as to be compressed to form a radial seal.

22 is a ring holder that comes into contact with the positioning part 19 and holds the Schiffle ring 20 by a predetermined amount of compression;
The diaphragm 14 and the membrane plate 15a are fitted into the diaphragm 14 and the membrane plate 15a.

15b and is fixedly attached by a bottle 16.

23 is a biasing element that biases the valve body 13 in the valve closing direction; 24 is a yoke 25, a yoke plate 26, and a coil? 27 and coil 27
This is a drive unit having an fc plunger 28 which is installed in the center of the FC plunger 28 so as to be movable up and down, and when the coil 27 is energized, an electromagnetic force is generated, and the plunger 28 is displaced downward to displace the valve body 13 and close the fluid outlet 11 side. Control pressure (flow rate).

In the above configuration, when the current is not energized, the valve body 13 receives a valve closing force by the biasing element 23, and the spherical rounded surface 21 is pressed against the valve seat 12 to close the valve and cut off the flow of fluid. Next, when the coil 27 is energized, the electromagnetic force acts on the plunger 2e, displacing the valve body 13''f: downward, and the pressure on the fluid outlet 11 side is controlled according to the amount of energization to the coil 27. serves as a banner.

And carp again! When the energization to 27 is stopped, the valve body 13
is closed by the force of the biasing element 23. At this time, valve seat 1
2, the contact position of the seal ring 20 does not necessarily match the initial state. This is due to the inclination of the valve closing force by the biasing element 23 and the diaphragm 14 made of a flexible material.
This is due to the fact that the valve body 13 is supported by the valve body 13, and due to external disturbances such as vibration, but because the ball-I curved surface 21 with the center point P is provided, the valve body 13 is slightly tilted. The valve seat 12 and the spherical rounded surface 21 are in close contact with each other and can be stably closed. Important points for closing are the roundness of the valve seat 12 and the roundness of the abutting portion of the seal ring 20, that is, the rounded surface 21. Since the valve seat 12 can be machined, it is easy to secure it, but since the seat ring 20 is an elastic member, its roundness deteriorates depending on the amount of compression, creating a gap between the valve seat 12 and the seal ring 2o, resulting in incomplete closure. As a result, so-called valve leakage may occur. FIG. 3 shows compression of the Schiff ring 20 by the ring holder 22 when the radial seal ratio δS of the difference between the outer diameter of the seal wall surface 18a and the inner diameter of the Schiff ring 20 to the inner diameter of the Schiff ring 20 is used as a parameter. This figure shows the relationship between the axial compression rate δr and the valve seat leakage amount Or. At this time, the material of Sea Relling 20 is NBR! rubber) and valve closing cover 150 f
g'), the applied fluid pressure is 500 mm H2O.

It can be seen from FIG. 3 that the valve sort leakage Qr increases as the compression ratio increases. The radial seal ratio δ satisfies the JIS internal leakage standard of 0.55//hr for solenoid valves.
The S ratio is within 4%, and the axial compression ratio δr is within 10%, and the seat railing 20 must be installed within this range. However, in order to ensure the above-mentioned appropriate compression ratios δS and δr, the dimensions of each component, such as the diameter D1 of the valve body 13, the inner diameter of the seal ring 20, the thickness of the seal ring 20, and the height dimension of the ring holder 22, must be adjusted fairly accurately. It will have to be processed. For example, if the thickness of the sealing ring 20 is 3 mm, the pressing margin must be within 0.3 mm. Therefore, by forming minute protrusions 29 on the seal ring 20, in this embodiment so-called circumferential thread beads, the radial compression ratio is divided into the same 4% as shown by curve C in FIG. The apparent allowable axial compression rate δr of 10 inches can be expanded to about 17 inches, which has the effect of increasing parts processing accuracy and increasing the stability of closure.

As described above, according to the present embodiment, the sealing ring 20, which is provided with the spherical radius surface 21 having the center point P on the central axis of the valve seat 12, is constructed as a single unit, and is fitted into the sealing wall surfaces 18a and 18b for positioning. Since the valve body 13 is attached to the valve body 13 with a predetermined amount of compression via the small protrusion 29 by the part 19 and the ring holder 22, the valve body 13 may be slightly compressed due to external disturbances such as repeated opening and closing of the valve or vibrations. Even if the valve seat 12 is tilted,
The spherical and rounded surfaces are in close contact with each other to provide reliable closing performance, and the small protrusions 29 allow the parts to be processed with loose dimensional tolerances, which is advantageous in terms of processability and cost. Microprotrusion 2
In this embodiment, a thread bead with an RO of about 15 is formed on the surface of the seal ring 20 facing the ring holder 22 to press it inward in the axial direction. Press the ball round surface 21
This has the effect of ensuring reliable closing by preventing the seal ring 20 from slipping up to the top of the valve body 13 with almost no distortion. is not necessarily limited to yarn beads, and the same effect can be obtained by forming a large number of point-like protrusions. Further, the location where the microprotrusions are formed is not limited to the upper surface of the seal ring 20 as in this embodiment, but may be formed on the lower end surface of the seal ring 20, that is, the surface opposite the valve body seal tube surface 18b. In the radial direction as well, if it is formed on the radially inner surface of the seal ring 20, that is, on the surface facing the valve body seal wall surface 18a, the permissible width of the radial pressing can be increased.

Furthermore, instead of forming minute protrusions on the sealing ring 20, the sealing wall surface 18a of the valve body 13.

Even if it is formed on the 18b side, it is possible to obtain the effect of stabilizing the closing performance in the same manner as described above, expand the holding margin, loosen the dimensional accuracy of the parts, and obtain the effects in terms of workability and cost.

Furthermore, if the seal ring 20 deteriorates, it can be replaced by removing the bushing nut 17, and the main six-way performance is also improved. In addition, in this embodiment, a driving part on which the plunger 28 slides is used, and a spring that acts in the direction of lifting the valve body 13 upward is used as the biasing element 23, so that the valve body 13 is tilted compared to the conventional example. It has the effects of being difficult to peel and having high closure reliability.

Effects of the Invention As described above, the fluid control valve with a closing function of the present invention provides the following effects.

(1) A seal ring made of an elastic member is provided with a spherical radius surface having a center point on the central axis of the valve seat, and
Since the structure is such that minute protrusions are formed on at least one of the seal ring or the valve body seal wall surface facing the seal ring, the ball arc? The valve body and seal ring can maintain close contact without distorting the sphericity of the surface.
In particular, when the valve is closed, the seal ring ball and the valve seat come into close contact with each other without any gaps around the entire circumference, ensuring reliable closure.

This means that even when the valve body is tilted due to disturbances such as vibrations, the spherical radius surface is in close contact with the entire circumference of the valve seat, and stable closing performance can be obtained.

(Since it has a structure in which minute protrusions are formed on either the 2-sea seal ring or the wall surface of the valve body facing the seal ring, the permissible width of the press against the seal ring is expanded, and the part processing The accuracy can be reduced, the workability of parts is high and the cost can be made low, and the stability of closing can also be improved.

(3) The microprotrusions absorb changes in the pressure of the seal ring due to expansion and contraction due to temperature changes, so the sphericity of the seal ring's rounded surface is maintained and the closure stability against temperature changes can be improved. effective.

(4) Assembled by fitting the elastic member into the valve body, unlike conventional adhesive or integral molding, it is easy to assemble and process, and has a high yield.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a fluid control valve with a closing function showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the valve section, and Fig. 3 is the relationship between the compression ratio of the seal ring and valve seat leakage. The characteristic diagram shown in Fig. 4 shows the conventional closure 1! Cross-sectional view of equipped fluid control valve, @
FIG. 5 is a cross-sectional view of the main part, and FIG. 6 is a diagram showing the shape of contact between the valve seat and the elastic member. 10...Fluid inlet, 11...Fluid outlet, 12...
... Valve seat, 13... Valve body, 18a, 18b...
Seal wall surface, 19... Positioning part, 20... Seal ring, 21... Ball arch, 22...
-Ring holder, 23-... biasing element, 29...
microprotrusions. Name of agent: Patent attorney Toshio Nakao and 1 other person10
...Arrest, #Entrance No. 211A No. 311 No. 411! il Figure 5 Figure 6/'

Claims (2)

[Claims] (1) A valve seat provided between a fluid inlet and a fluid outlet, a valve body provided with a seal wall surface and a positioning portion, a spherical radius surface having a center point on the central axis of the valve seat, and an elastic member. a ring holder that contacts the positioning portion and holds the seal ring on the valve body; and a biasing element that biases the valve body to close. A minute protrusion is formed on at least one surface of the ring holder facing surface or the valve body seal wall surface, or a minute protrusion is formed on the valve body seal wall surface facing the seal ring or the ring holder, and a minute protrusion is formed on the ring holder and the valve seat. A fluid control valve with a closing function that closes when the rounded surface comes into contact with it. (2) The fluid control valve with a closing function according to claim 1, wherein the minute protrusion is constituted by a thread bead formed in a circumferential shape on the upper end surface of the seal ring.