JPS62297577A - Fluid control valve associated with closing function - Google Patents

Abstract

PURPOSE:To improve the assembling performance by separating into three components, i.e. a seal ring to be inserted over a valve body, a valve body and a ring holder for holding the seal ring in the valve body. CONSTITUTION:Valve construction members are separated into three components, i.e. a valve body 13 mounting a diaphragm 14, a seal ring 20 composed of a resilient member and a ring holder 22 contacting against a positioning section and holding the seal ring 20. It is assembled such that the seal ring 20 is first inserted over the valve body 13 then the ring holder 22 is fitted, thereby the assembling performance is improved and the individual part can be machined with high accuracy.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention is installed in gas combustion appliances,
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 a fluid control valve with an attached fluid control valve.

Conventional technology A fluid control valve with a closing function is a fluid control valve that adds a fluid shutoff function to omit a dedicated closing solenoid valve, with the aim of making the fluid control system more compact and lowering costs.
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
, and FIG. 5, 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 is repelled by the permanent magnet 1. It includes an electromagnetic coil 4 that generates magnetic force in the direction, and a diaphragm 6 that biases the valve body 2 in the valve closing direction in response to pressure from the fluid inlet 5.
By controlling the current applied to the electromagnetic coil 4, the electromagnetic repulsion force is controlled, and the valve body 2 is moved up and down freely.
The valve opening is controlled by the balance between the fluid pressure acting on the valve body 2 via the diaphragm 6 and the electromagnetic repulsive force, and the fluid pressure is proportionally controlled.

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, 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 a diaphragm made of a flexible material. As a result, since the contact surface of the elastic member 7 with the valve seat 8 is tapered, the shape of the contact of the elastic member 7 with the valve seat 8, which is machined into a perfect circle with high precision, is an ellipse as shown in FIG. Due to the shape of the valve, a small gap is formed between the valve seat 8 and the elastic member 7, causing the problem of fluid leakage, and in order to solve this problem, it is necessary to increase the valve closing force. In other words, it is necessary to increase the attractive force of the permanent magnet 1 to cope with the problem, resulting in a problem that the electromagnetic coil 4 becomes larger.

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

In other words, adhesive is used as a means for attaching the elastic member 7 to the valve body 2.
Integral molding or the like is used, but if adhesive is used, there is a risk that the elastic member 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 with a heat resistance temperature higher than the vulcanization temperature of rubber, and as a result, it is limited to metals, etc., and as a result, turning Processing is required and leads to added eco-stored lumps. Further, since the elastic member 7 contracts non-uniformly during cooling during integral molding, highly accurate roundness cannot be obtained, resulting in poor yield.

In the conventional example, the valve opening force becomes large, the driving part becomes large, and the workability and yield are poor, which leads to an increase in the cost of the fluid control valve.

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 between a fluid inlet and a fluid outlet. a seal ring that is fitted into a 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; and a force that operates the valve body against the force of the biasing element. The valve body is composed of a drive unit that generates a pressure, and a ring holder that holds the seal ring within the valve body.

With this configuration, after individually machining important parts with high precision, the seal ring is inserted into the valve body, and the seal ring is held by the ring holder with a predetermined amount of compression, so that the seal ring comes into contact with the valve seat. The surface is maintained with high precision, allowing stable closing with little valve closing force. Furthermore, it is possible to prepare individual parts in a separate process and then assemble them, which improves assembly efficiency.

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 in the darkness, 13 is a fluid inlet 10
A diaphragm 14 that operates in response to side pressure is fixedly mounted together with membrane plates 15a+1bb provided above and below by a bottle 16 and a bushing nut 17, and a sealing wall surface 18.
The valve body 20 has a spherical radius surface 21 having a center point Pe on the central axes C and L of the valve seat 12, has a uniform cross-sectional shape over the entire circumference, and has an elastic member. The seal ring 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 to form a radial seal.

22 is a ring holder that abuts against the positioning portion 19 and holds the seal ring 20 at a predetermined compression amount, and is inserted into the valve body 13 to connect the diaphragm 14 and the membrane plates 15 a and 15 b.
It is also 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 drive unit that includes a yoke 25, a yoke plate 26, a coil 27, and a plunger 28 that is movable up and down in the center of the coil 27; By energizing 27, an electromagnetic force is generated, and the plunger 28 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 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, electromagnetic force acts on the plunger 28 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 27. It also performs the well-known governor function.

Then, when the current supply to the coil 27 is stopped again, the valve body 13 is closed by the force of the biasing element 23.

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 inclination of the valve closing force by the biasing element 23, the support of the valve body 13 by the diaphragm 14 made of a flexible material, and disturbances such as vibration. Since the rounded surface 21 is provided, even if the valve body 18 is slightly disposed, the valve seat 12 and the spherical rounded surface 21 come into close contact with each other and can perform 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.

Figure 3 shows the radial sealing ratio δs of the seal ring 20 to the outer diameter of the seal wall surface 18a (where d is the inner diameter of the seal ring 20, δ5=((D d)/D~X100(χ)). The ratio at which the seal ring 20 is compressed by the ring holder 22 when taken as a parameter, that is, the axial compression rate δr (here, the axial gap formed between the seal wall surface 18b and the lower end surface of the ring holder 22 is t1) If the height in the direction 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. The JIS internal leakage standard for solenoid valves #I0, 55 (1/hr) is satisfied when the radial seal ratio δs is within 4% and the axial compression ratio δr is 1.
It is within 0%, and the seal ring 20 must be installed within this range.

As described above, according to this embodiment, since the seal ring 20 is provided with the spherical radius surface 21 having the center point P on the central axis of the valve seat 12, it is not affected by external disturbances such as repeated opening and closing of the valve and vibration. Even if the valve bodies 13 are slightly different, the valve seat 12 and the spherical radius surface 21 are in complete contact with each other, and the seal ring 20 is constructed as a single unit and is inserted into the seal wall surfaces 18a+18b, and the positioning portion 19 and ring holder 22 Since it is attached to the valve body 13 with a predetermined amount of compression, the spherical radius surface 21 is maintained at high precision both during and after assembly, and the valve seat 12 and the spherical radius surface 21 are in complete contact with each other, resulting in stable closing performance. . Therefore, it is possible to reduce the valve-closing force exerted by the biasing element 23, and the coil 27 can be made smaller.

In addition, assembly is possible by fitting the seal ring 20 into the valve body 13 and then fitting the ring holder 22, improving assembly efficiency.Also, the important seal ring 20 has a uniform cross section over the entire circumference, resulting in high precision. It can be molded and processability is also improved.

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 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 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 three elements: the seal ring, the valve body, and the ring holder, the individual parts can be assembled after being processed with high precision using processing means that are highly suitable for mass production. Therefore, ease of assembly and mass production are improved.

(2) Since the seal ring is held in the valve body by the ring holder with a predetermined amount of compression, the contact surface with the valve seat is maintained with high precision both during and after assembly.

Therefore, reliable closing can be performed with a small valve closing force, making it possible to reduce the size and cost of the drive unit. Additionally, durability is improved because the amount of deformation of the seal ring (the amount of digging into the valve seat) when the valve is closed can be reduced.

(3) 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.

(4) Since the seal ring is inserted into the structure, deformation of the seal portion, 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.
The practical temperature range can be expanded.

[Brief Description of the Drawings] 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 compressibility of the seal ring. Characteristic diagram showing the relationship between and valve seat leakage,
FIG. 4 is a cross-sectional view of a conventional fluid control valve with a closing function, FIG. 5 is a cross-sectional view of the main part thereof, 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, 20... Seal ring, 22
...Ring holder, 23...Biasing element, 24...
Drive part. Name of agent: Patent attorney Toshio Nakao (If one person) -
111a, I&M - L wall surface 19- position, i7 joint Fig. 3 Radial displacement pressure MI rp (phantom figure 4)

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, a drive unit that generates a force that operates the valve body against the force of the bias element, and a ring that clamps the seal ring within the valve body. A fluid control valve with a closing function consisting of a holder and a holder. (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.