JPS59144873A - Overflow preventing valve - Google Patents

Abstract

PURPOSE:To allow a valve to be installed even in a gas pasage with a small diameter by forming a valve seat in the gas passage and mounting a ball valve on the opening of a valve receiving member so as to be supported by the opening edge. CONSTITUTION:Under a normal gas usage condition, a ball valve 26 is stationarily supported by a valve receiving member 19a, and the gas flowing from a gas pipe connection port 11a flows through a gas passage 17b a hole 21a a side opening 25a a gas path 27 a valve port 18a a gas passage 17a a gas passage in that order. On the other hand, when an abnormal condition occurs, the ball valve 26 is pushed up and floated by the gas stream from openings 21a and 24a due to the dynamic pressure caused by an abrupt increase of the gas flow, and it is coupled with a valve seat 18 in close contact by pressure to cut off the gas stream. This valve closing operability can be adjusted with individual areas of the valve port 18a, round hole 21a, upper opening 24a, side opening 25a, and gas path 27; the diameter and weight of the ball valve 26; distance between the valve seat 18 and ball valve 26 under an inoperative condition; etc. Since the ball valve is merely mounted on the round opening of the valve receiving member, the diameter of a fitting portion of the valve receiving member is not required to be made too large with respect to that of the ball valve, and its height can be made low, thus the whole body can be designed in a small shape.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The invention relates to an overflow prevention valve, which is installed in a gas flow path and is used to prevent the separation of a rubber pipe that connects a gas pipe and a gas appliance, for example. It is used as a safety device that automatically operates to cut off the gas flow in the event of an abnormal situation such as damage or malfunction of a gas appliance, preventing a gas leak or gas explosion.

(Prior art) As shown in Fig. 10, this type of overflow prevention valve is as follows.
The inner surface of the two cylindrical portions 1a constitutes the valve seat 2, and the upper cylindrical portion lb
A generally cylindrical valve box 1, which houses a ball valve 3 therein, is screwed from below into a receiving part 5 in a gas flow path 4 extending from below to above. 6 is a pin that supports the ball valve 3;
Reference numeral 7 designates an opening 1-shaped opening I opened near the boundary between the upper cylinder part 1a and the upper cylinder part 1b.

In such an overflow prevention valve, under normal gas usage conditions, the ball valve 3 is caused by its own weight to collapse into the upper cylinder portion 1b as shown by the solid line in the figure.
The gas jJIJ! is located at the lower part of the upper cylinder part 1b from introduction example 4a. l! It flows into the upper cylinder part 1a from the open lower part 7 through 84b, and flows to the outlet side 4c. When an abnormal situation occurs, the ball valve 3 floats up due to the dynamic pressure caused by the sudden increase in the gas flow rate, and presses into the valve seat 2 as shown by the dashed line in the figure, cutting off the gas flow. .

However, in the conventional overflow prevention valve described above, the upper cylinder part 1b needs to have a diameter that does not interfere with the floating operation of the ball valve 3, and the gas passage 4b is formed around the upper cylinder part 1b. Therefore, there is an inconvenience that the installation part must be limited to the gas flow path 4 having a large inner diameter.

In addition, in order to smoothly perform the floating operation of the body valve 3, the gap caused by the formation of the open lower part 7 is removed, and the lower joint part 1b is removed.
Precision finishing is required to smooth the inner surface, which increases the size of the valve body 8 and increases production costs.

(Object of the Invention) This invention was made to eliminate the above-mentioned conventional drawbacks, and it is easy to downsize and can be installed in a gas flow path with a small diameter. It is an object of the present invention to provide a gas overflow prevention valve that can be installed inside the vehicle, has a simple structure, and is easy to manufacture.

(Structure of the Invention) This invention forms a valve seat in a gas flow path going upward from the lower blade, and includes a circular opening that communicates vertically at a position directly below the valve opening, and a gas passage around the valve seat. The valve receiver relates to an overflow prevention valve in which a member is mounted below the valve seat, and a body valve having a larger diameter is placed on the opening of the member and supported by the edge of the opening.

(Function) In the above configuration, when the poultry is using gas, the body valve is fitted into the circular opening, and the gas is guided out through the valve holder through the gas passage around the member. Do you reach the side?
When an abnormal situation occurs, the valve body receives the accompanying dynamic pressure from the lower side of the circular opening, floats up, comes into pressure contact with the valve seat, and reduces the gas flow.
a.

(Example) In Fig. 1, reference numeral 11 denotes a gas valve cock main body equipped with a gas pipe connection port If at the lower end, llb indicates a rubber pipe connection port protruding laterally from the main body 11, and 12 indicates an inner side of the upper part of the main body 11. An opening/closing tab for rotating the fitted closure 12 in the circumferential direction via the cylindrical portion 13a that engages the protruding shaft @ 12a; 14;
15 is a coil spring interposed between the end face of the lower end flange portion of the cylindrical portion 13a and the annular recess 12b on the upper surface of the closure 12 to press the closure 12 downward; This is a snap ring that prevents it from being pulled out. Thus, the closure 12 has a gas flow path 17a bent at 90 degrees extending from the lower end surface to the side surface, and in its open position, one gas pipe connection is made, and a gas flow path 17b and a rubber pipe are connected to the l a side. Connection] While communicating with the gas flow path 17c in the Llb, the connection with the gas flow path 17c is cut off in the closed position.

The upper part of the gas flow path 17b has a diameter reduced upward to form a ζ valve seat 18, and a valve receiving member 19a is provided below the valve seat 18.
is attached via a snap ring 2o. As shown in FIG. 2, the valve receiver member 19a has a disk-shaped support portion 22a with a circular hole 21a in the center whose diameter increases toward the bottom surface.
The upper end opening 24a of the cylindrical part 23a communicates downward with the circular hole 21a, and the lower part of the cylindrical part 23a has a side opening 25a.

25a has been opened. In addition, the upper end opening 24a is located directly below the valve port 18a when the valve receiver shown in the first figure is attached to the member 19a, and a body valve 26 having a diameter larger than the inner diameter is placed on the opening 24a. and is supported by the open L'' edge 24'a of the opening 24a. The outer periphery of the cylindrical portion 23a forms a gas passage 27 extending from the circular hole 2La through the side openings 25a and 25a to the valve port 18a.

In the above configuration, under normal gas usage conditions, the body valve 26 is supported by the valve receiving member 1.9a and does not move, as shown by the solid line in the first diagram, and the gas flows from the gas pipe connection 1.9a. The gas flows through the gas flow path L7b, the hole 21a, and the side opening 25a.

25a→Gas passage 27→Valve 18a→Gas passage 17a→
The gas flows in the order of gas flow path 17c. On the other hand, when an abnormal situation occurs, the body valve 26
is pushed up and floated by the gas flow from the openings 2]a and 24a, and is fitted into the valve seat 18 under pressure as shown by the dashed line in the first figure, thereby blocking the gas flow. This valve closing operability is
18a, circular hole 21a 3. It can be adjusted by the area of each part of the J two-end opening 24a, the side openings 25a, 25a, the gas passage 27, the diameter and weight of the body valve 26, the distance between the valve seat 18 and the body valve 26 in the non-operating state, etc. . In addition, the body valve 26 is
Materials made of synthetic resin such as nylon can also be used, but for miniaturization, metal materials such as steel balls with high specific gravity are preferred, and steel holes are particularly advantageous in terms of cost since they are inexpensive. .

In the valve receiver shown in FIGS. 1 and 2, the support portion 22b is composed of a plurality of radial legs 28, for example, as shown in FIG. 3, instead of the member 19a. The receiver is member 1911, or the receiver is member 19, which has a plurality of openings 29 formed in the disk-shaped support portion 22c as shown in FIG.
c may also be used. These valve holders are part +A19b, 19c
In this case, a primary passage that directly communicates with the gas passage 27 from below is formed through the gap 28a between the leg pieces 28, 28 or the opening 29, so that the cylindrical parts 23b, 23
Although the side openings 25b and 25c bored at the bottom of each hole c are not essential, these side openings 25b and 25c are connected to the circular hole 21b.
, 21c constitute a secondary passage communicating with the gas passage 27, and the operational performance of the body valve 26 placed on the opening edges 24°b, 24'c of the upper end openings 24b, 24c can be adjusted depending on the size thereof. Further, as a member, the valve holder may be used, for example, as shown in FIG. 5 and FIG.
Even if it is a structure that is placed directly on 1d, G'1゜30・
... is a guide protrusion provided as necessary. In this case, although the support portion 22d is shown to have the same configuration as that in FIG. 4, instead of this, a leg piece 28 similar to that in FIG.
There is no problem even if the structure is equipped with... In addition to using the snap knob ring shown in FIG. 1, the valve receiver 31 members may be attached to the gas flow path by means such as screwing or press-fitting.

FIG. 7 shows an embodiment in which an overflow prevention valve is installed inside the closure of the gas valve cock. In the figure, reference numeral 31 denotes a gas valve main body, 32 having a gas pipe connection port 31a projecting to one side at the lower part and a rubber pipe connection port 31b projecting to the other side at the second part. 33 is an opening/closing knob that engages with the protrusion 32a of the closure 32; 34 is a coil spring that presses and biases the closure 32 downward; 35 is a snap ring 36; The spring holder that is prevented from being removed is a plate. 1, the closure 32 is provided with a gas flow path 37 bent at 90 degrees from the lower end surface to the side surface, and a vertical flow path portion 37a of this flow path 37 is provided.
The upper part of the valve member 18 is reduced in diameter upward to form a valve seat 18, and a valve receiver member 19a similar to that shown in FIGS. 1 and 2 is mounted below the valve seat 18. In addition, this valve receiver is member 19a.
Instead, valve receivers having other configurations as shown in FIGS. 3 to 5 may be used. In the above configuration, when an abnormal situation occurs, the body valve 26 operates inside the closure 32 in the same manner as in the case shown in FIG. 1, and closes the gas flow path 37. In this embodiment, an overflow prevention valve can be installed inside the closure 32, so assembly is easy.

FIG. 8 shows an embodiment in which an overflow prevention valve is installed in a high-pressure gas flow path of a standardized full appliance 38 for an LPG (liquefied petroleum gas) cylinder (not shown). The cap device 38 includes a vertical gas flow path 41 that communicates the cylinder connection port 39 and the outlet side gas flow path 40, and a safety valve gas flow path 42 is connected to the side of the vertical gas flow path 41. A regulator gas flow path 43 is connected to the side of the gas flow path 40 . Therefore, the upper end opening edge 41a of the vertical gas flow path 41
A ring member 44 having a valve seat 43 formed therein is fitted into the ring member 44, and the valve receiver is screwed into the flow passage 41 at a position directly below the ring member 44 with the member 19e supporting the body valve 26.

As shown in FIG. 9, this valve receiving part 'FA' l 9 e has a support part 22e having three leg pieces 44 with grooves 44a formed on the circumferential side, and an opening at the upper end through which the inside is vertically transparent. Vertical cylindrical part 23 supporting body valve 26 at the opening edge of 24c
e, and a side opening 25e at the bottom of the cylindrical portion 23e.
, 25e, and a gas passage 27 is formed around the outer periphery of the cylindrical portion 23e in the attached state.

It should be noted that, in addition to the valve receiver shown in the drawings, other structures such as those shown in FIGS. 2 to 5 may be used as the valve receiver. It is also possible to use a snap ring or press fit.

According to the above configuration, when a field lightning situation occurs, the body valve 26 operates in the same manner as in the case of the two-length embodiment described above, floats up from the solid line position shown in the figure, and presses into the valve seat 43 as shown by the dashed line in the figure. to cut off the gas flow.

(Specific Effects of the Invention) In the overflow prevention valve according to the present invention, since the valve receiver has a configuration in which the body valve is simply placed on the circular opening of the member, the valve receiver member has a large diameter with respect to the diameter of the body valve. There is no need to make the diameter of the attachment part very large, and the height can be made low, allowing the overall design to be compact.

Therefore, the overflow prevention valve can be installed in a narrow gas flow path, and can also be installed in the closure of a gas valve cock. In addition, since the structure is extremely simple and can be miniaturized, it can be easily installed in various existing instruments such as standard products that are generally used in large quantities without changing the basic design. Furthermore, in this invention, since the valve seat itself only supports the body valve on the vehicle, it can be formed from a synthetic resin molded product like the conventional product (no precision finishing is required, and the valve seat is Since only one part needs to be precisely finished, manufacturing is easy and costs are reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a first embodiment of the invention, FIGS. 2 to 5 are perspective views showing modified examples of valve receiver members, and FIG. 6 is a number of valve receiver members shown in FIG. 5. Longitudinal cross-sectional view of main parts showing phrase state, No. 7
The figure is a longitudinal sectional view of the second embodiment of the invention, FIG. 8 is a longitudinal sectional view of the third embodiment, FIG. 9 is a plan view of the valve receiving member used in the third embodiment, and FIG. 10 is a vertical cross-sectional view of a conventional overflow prevention valve. 17b, 37a, 41-gas flow path, 18.43-=valve seat, ]-8a...valve port, 19a, 19b, 19c,
19d, 19e-Valve receiver is a member, 2F, 21b, 21
c, 21d = circular hole (circular opening), 24a, 24b
, 24c... upper end opening (circular opening), 24'a,
24'b, 24'c...Opening edge, 26...Body valve, 27...Gas passage. Applicant: Gust Sob Industries Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Heat 5 Figures 2 to 6 Arch procedure amendment (method) (Patent Office Examiner) 1. Indication of the case 1988 Patent Application No. 19356 No. 2, Title of the invention: Excessive outflow prevention valve 3, Relationship with each case of pressure compensation 11g1ri Address (residence) Name: Gastop Kogyo Co., Ltd. 4, Agent
Address: 1-1 Nagasu Nishi-dori, Amagasaki, Kyoko Prefecture, 660 May 11, 1980 (Date of dispatch: May 31) 6. Jotada of details subject to amendment (no change in content). 7. Details of the supplement as shown in the attached sheet.

Claims (1)

[Claims] A valve seat is formed in a gas flow path going from below to above, and a valve seat is provided with a circular opening that communicates with the upper and lower Q at a position directly below the valve opening, and a gas passage is formed around the valve seat. At the same time, this valve receiver is made by placing a ball valve with a larger diameter on the circular opening of the member and supporting it by the edge of the opening. The overflow prevention valve is configured such that the ball valve floats up and comes into pressure contact with the valve seat, thereby blocking the gas flow.