JPS62297578A - Fluid control valve associated with closing function - Google Patents

Abstract

PURPOSE:To improve the assembling performance by separating into four components, i.e. a seal ring to be inserted over a valve body, a valve body, a ring holder for holding the seal ring in the valve body and a resilient member for energizing the seal ring in the compressing direction. CONSTITUTION:Valve construction members are separated into a valve body 13 mounting a diaphragm 14, a seal ring 20 composed of a resilient member, a ring holder 22 and a resilient member 23 for holding the seal ring 20 with a constant pressing force. It can be assembled by first inserting the seal ring 20 over the valve body 13 then mounting the ring holder 22 and the resilient member 23 thus improving the assembling performance.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention゛Industrial Application Field The present invention is installed in a gas combustion appliance, etc., and is used to generate combustion load signals,
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. and a diaphragm 6 that biases the valve body 2 in the valve closing direction in response to pressure from the fluid inlet 5.
The electromagnetic repulsion force is controlled by controlling the current applied to the valve body, allowing the valve body 2 to move up and down freely, and the valve being opened by the balance between the fluid pressure acting on the valve body 2 via the diaphragm 6 and the electromagnetic repulsion force. and is configured to proportionally control fluid pressure.

In the fluid control valve with a closing function configured as described above, when the current is not energized, the elastic member 7 attached to the valve body 2 is pressed against the valve seat 8 by the force of the permanent magnet 1 being attracted to the fixed iron core 3, and the valve is closed. It blocks the passage.

However, in this conventional example, it is difficult to provide the elastic member 7 integrally with the valve body 2. That is, adhesion, integral molding, etc. are used as a means for attaching the elastic member 7 to the valve body 2, but when adhesive is used, there is a risk that the elastic member 7 will deteriorate due to the adhesive, and the 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. Further, since the elastic member 7 contracts non-uniformly during cooling during integral molding, highly accurate roundness cannot be obtained, resulting in poor yield.

The problem to be solved by the invention is that in the conventional example, when the elastic member is integrated with the valve body, complicated machining is required, and reliability and yield are poor. This led to an increase in costs.

Means for Solving the Problems The present invention solves the above problems, and includes a valve seat provided between a fluid inlet and a fluid outlet, a valve body provided opposite to the valve seat, and a valve seat provided opposite to the valve seat. a seal ring that is fitted into the valve body and is made of an elastic member; a biasing element that acts in a direction to press the seal ring against the valve seat; a ring holder that holds the seal ring within the valve body; and the ring holder. An elastic body is provided that acts in a direction to compress the seal ring with a predetermined pressing force.

Function: With this configuration, after the important parts are individually machined with high precision, the seal ring is inserted into the valve body, and the seal ring is further held between the ring holders, which improves workability and assemblability. In addition, since the seal ring is held by an elastic body through a ring holder, the seal ring made of an elastic member is always held within the valve body with a constant pressing force, and the contact area with the valve seat, which is important for closing, is The roundness (sphericity) of the tube does not deteriorate and stable closing performance can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described based on 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 a main part of the valve portion. In FIGS. 1 and 2, 9 indicates a fluid inlet 10 and a fluid outlet 11.
A valve body with a valve seat 12 provided therebetween, 13 a fluid inlet 10;
A diaphragm 14 that operates in response to side pressure is fixedly attached to the upper and lower membrane plates 15a and 15b by a bottle 16 and a bushing nut 17, and a seal wall surface 18a.
, 18b and a valve body provided with a positioning part 19, 20 is a valve seat 1
A spherical radius surface 2 having a center point P on the central axes C and L of 2.
1 and has a uniform cross-sectional shape over the entire circumference, is a seal ring made of an elastic member, has an inner diameter smaller than the outer diameter of the seal wall surface 18a, and is mounted so as to compress the seal wall surface 18a. A radial seal is created.

22 is in contact with the positioning portion 19 and the seal ring 20t!
: A ring holder for holding, which is inserted into the valve body 13,
Elastic body 2 interposed between membrane plate 15b and ring holder 22
3 holds the seal ring 20 within the valve body with a constant pressing force.

24 is a biasing element that biases the valve body 13 in the valve closing direction; 25 is a drive unit that includes a yoke 26, a yoke plate 27, a coil 28, and a plunger 29 that is movable up and down in the center of the coil 28; By energizing 28, an electromagnetic force is generated, and the plunger 29 is displaced downward to operate the valve body 13 and control the pressure (flow rate) on the fluid outlet 11 side.

In the above configuration, when the current is not energized, the valve body 13 receives a valve closing force by the biasing element 24, and the spherical round surface 21 is pressed against the valve seat 12 to close the valve and cut off the flow of fluid. Next, when the coil 28 is energized, electromagnetic force acts on the plunger 29 to displace the valve body 13 downward, and the pressure on the fluid outlet 11 side is controlled according to the amount of energization to the coil 28. It also performs the well-known governor function.

Then, when the current supply to the coil 28 is stopped again, the valve body 13 is closed by the force of the biasing element 24.

At this time, the contact position of the seal ring 20 with respect to the valve seat 12 does not necessarily match the initial state. This is due to the slope of the valve closing force by the biasing element 24 and the diaphragm 14 made of a flexible material. This is due to the support and disturbances such as vibrations, but since the spherical radius surface 21 centered at point P is provided, the valve seat 12 and the spherical radius surface 21 are in close contact even if the valve body 13 is slightly disposed. It is possible to make abutting contact and stable closing. Important points for closing are the roundness of the valve seat 12 and the roundness of the contact portion of the seal ring, that is, the rounded surface 21. Since the valve seat 12 can be machined, it is easy to secure it, but since the seal ring 20 is made of an elastic member, the roundness may deteriorate depending on the amount of compression.

FIG. 3 shows the radial seal ratio δs of the seal ring 20 to the outer diameter of the seal wall 18a (here, if the inner diameter of the seal ring 20 is d, δ5=((D-d)/D))X
Ring holder 2 when 100 (%)) is used as a parameter
2, that is, the axial compression rate δr (here, t is the axial gap formed between the seal wall surface 18b and the lower end surface of the ring holder 22, and the axial height of the seal ring 20 is T). Then, Qr = ((T - t )/T )) X 100(
%)) and the valve seat leakage amount Qr. At this time, the material of the seal ring 20 was NBR (trill rubber), the valve closing force was 150 (g), and the applied fluid pressure was 50 g.
0 mmH2O.

From Fig. 3, as the compression ratio δr increases, the valve seat leakage Qr increases.
It can be seen that the amount increases. JIS internal leakage regulations for solenoid valves #! t 0 , 55 (1/hr) is satisfied when the radial seal ratio δs is within 4% and the axial compression ratio δr
is within 10%, and the seal ring 20 must be installed within this range.

As described above, according to this embodiment, the seal ring 20 having the spherical rounded surface 21 having the center point P on the central axis of the valve seat 12 is constructed as a single unit, and is inserted into the seal wall surfaces 18a+18b, and the ring Since it is attached to the valve body 13 with a constant pressing force by the elastic body 23 via the holder 22, the sphericity of the spherical radius surface 21, which is important for closing, does not change, and the valve can be repeatedly opened and closed. Even if the valve body 13 is slightly distorted due to disturbances such as vibration, the valve seat 12 and the spherical radius surface 21 are in complete contact with each other to provide stable closing performance, and the seal ring 20 can be inserted into the valve body 13. After that, assembly can be performed by attaching the ring holder 22 and the elastic body 23, which improves the ease of assembly. Furthermore, since the important seal ring 20 has a uniform cross section over the entire circumference, it can be molded with high precision and improves workability.

Furthermore, if the seal ring 20 deteriorates, it can be replaced by removing the bushing nut 17, improving maintainability. In addition, in this embodiment, a driving part of the type in which the plunger 29 slides is used, and a spring that acts in the direction of lifting the valve body 13 upward is used as the biasing element N23, so that the valve body 18 is less likely to tilt compared to the conventional example, and the closing is reliable. It has effects such as high performance.

Effects of the Invention As described in detail above, according to the present invention, the following effects can be obtained.

(1) Since it is separated into four elements: the seal ring, the valve body, the ring holder, and the elastic body, each individual component can be assembled after being processed with high precision using a processing method that is highly suitable for mass production. Therefore, ease of assembly and mass production are improved.

(2) Since the seal ring can be manufactured as a single unit, the important contact surface with the valve seat can be obtained with high precision, improving closing reliability and yield.

(3) The seal ring is held in the valve body by an elastic body through the ring holder with a constant pressing force, making it easy to manage the pressing force of the seal ring and ensuring that it does not come into contact with the valve seat both during and after assembly. The surface remains highly accurate. Therefore, reliable closing can be performed with less valve closing force, the valve can be operated with less driving force, and the amount of deformation of the seal ring (the amount of digging into the valve seat) when the valve is closed can be reduced, improving durability. .

<4) Since the seal ring is inserted into the structure, the deformation of the seal part, that is, the contact surface of the seal ring with the valve seat, due to temperature changes can be reduced compared to a method in which the elastic member is integrally molded, and the practical temperature range can be expanded. .

[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 shows the relationship between seal ring compression ratio and valve seat leakage. Characteristic diagram shown,
FIG. 4 is a sectional view of a conventional fluid control valve with a closing function. 10...Fluid inlet, 11...Fluid outlet, 12...
Valve seat, 13... Valve body, 20... Seal ring, 21
... Spherical radius surface, 22 ... Ring holder, 23 ...
- Biasing element, 24... elastic body. Agent's name: Patent attorney Toshio Nakao One idiot, 3 illustrations of foil, 9M, I'm a prisoner (G/,) 4th illustration, 9 Misami also present

Claims (2)

[Claims] (1) A valve seat provided between a fluid inlet and a fluid outlet, a valve body provided opposite to the valve seat, a seal ring made of an elastic member fitted into the valve body, and the valve seat. a biasing element that acts in a direction to press the seal ring against the valve body; a ring holder that holds the seal ring within the valve body;
A fluid control valve with a closing function, which has an elastic body that acts on the ring holder in a direction to compress the seal ring with a predetermined pressing force. (2) The radial sealing ratio δr of the seal ring fitted into the valve body is within 4%, and the axial compression ratio δs of the seal ring by the ring holder is within 10%, as claimed in claim 1. Fluid control valve with closing function as described.