JPH0341193Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial Application Field>> This invention relates to an improvement of the joint portion of a high-pressure hose used for connection between an LPG container and an automatic switching regulator.

《Prior art》 In liquefied gas supply equipment in which liquefied gas from multiple LPG containers is switched and supplied to gas appliances, conventionally, as shown in Figure 3a and b, multiple used and spare LPG containers are used. Piping is connected between the container 1 and a switching pipe unit 3 provided with an automatic switching regulator 2, or between each of the LPG containers 1 and the automatic switching regulator 2 via a high-pressure rubber hose 4 with a high degree of freedom in piping.

The automatic switching regulator 2 has two functions: reducing the temporary side (supply side) gas pressure appropriately and sending it to the secondary side, and switching between each LPG container that is a supply source.

<<Problems to be solved by the invention>> Therefore, in this gas supply equipment, the caulking part for the high pressure rubber hose 4 and its connection part, which is the joint part, is the part of greatest concern in terms of strength, and the arrangement of the LPG container Also, depending on the piping, the rubber layer may deteriorate due to the rubber hose being connected in a twisted state, the hose itself may be destroyed due to breakage, etc., it may come off from the joint, gas may blow out due to breakage of the joint, etc. There is. In the case of LPG container 1 alone with the corresponding high pressure rubber hose 4 connected,
An attached shutoff valve provided at the supply end of the container 1 senses the pressure and shuts off the valve, so that even if the hose 4 is damaged, a blowout can be prevented.

However, especially in gas supply equipment using the automatic switching regulator 2, gas ejected from other containers 1, including spare containers, other than the container 1 to which the high-pressure rubber hose 4 is connected may enter the damaged part of the container. The larger the number of facilities, the more likely they are to leak gas and cause a major accident.

In addition, the connection part of the high-pressure rubber hose 4 needs to be removed from the corresponding container when replacing the container.
If one forgets to close the stop valves, etc. of other containers before leaving the container, there is a risk that high-pressure gas will flow back into the removed section, causing a large amount of gas to be released.

This invention solves the above problems, and by incorporating a check valve mechanism inside the hose joint, it is possible to prevent a large amount of gas from being released in case of an emergency. The purpose is to

<Means for Solving the Problems> In order to achieve the above object, the high pressure hose joint with a built-in check valve of this invention has one end A that can be hermetically screwed onto the gas piping side, and the other end B that can be screwed onto the high pressure rubber hose. A joint body that can be inserted and caulked into the joint body, a ball that closes the flow hole by coming into contact with a valve seat having a tapered surface formed in the flow hole inside the joint body, and a ball that is biased in the opening direction. and an adjustment screw that is screwed into the opening at one end A of the joint and comes into contact with the back of the ball to prevent the ball from coming out and to adjust the contact pressure of the ball with the spring. It is something to do.

<<Operation>> Under normal conditions, the ball built into the joint holds the valve open by spring pressure. If high-pressure gas flows back into the joint for some reason, the ball moves against the spring pressure and comes into contact with the valve seat, closing the flow hole.

<<Example>> Hereinafter, an example of this invention will be described in detail using the drawings. Note that the same parts as in the conventional example will be described using the drawings and given common reference numerals.

Figures 1 and 2 show a hose joint connected to the end of a high-pressure rubber hose according to this invention.

In the figure, reference numeral 10 denotes a joint body which is connected to the high-pressure comb hose 4 and has a male threaded portion 14 at one end and a nipple portion 16 at the other end with the bolt portion 12 in between.

The inside of the communication hole 10a of the joint body 10 has a large diameter portion 10b that is expanded toward the male threaded portion 14 side.
is formed, and the tapered surface that separates the two is the valve seat surface 1.
0c, and a female threaded portion 10d is formed on the inner surface of the large diameter portion 10b on the exit side. Then, the large diameter portion 10
A spring 18 and a ball 20 which is biased by the spring 18 in a direction away from the valve seat surface 10c are mounted inside the valve seat b.

The back of this ball 20 has the female threaded portion 10d.
An adjustment screw 22 is screwed into and fixed to the ball 20 to support the back surface of the ball 20.

The adjustment screw 22 is hollow inside and also serves as a member for adjusting the spring pressure of the spring 18. By inserting a driver into a driver groove 22a formed at the end and deeply screwing the adjustment screw 22, By bending the spring 18, the resistance to the operating pressure of the ball 20 is increased, and by screwing it in shallowly, it can be set to have a weak resistance to the operating pressure of the ball 20.

In the above configuration. The male threaded portion 14 side of the joint body 10 is airtightly connected to the connecting end of the pipe unit 3 as shown in FIG. 3a, or to the connecting end of the automatic switching regulator 2 as shown in FIG. 3b. .

Further, the end portion of the high pressure rubber hose 4 is fitted onto the outer periphery of the nipple portion 16, and the high pressure rubber hose 4 is firmly connected by being caulked by a caulking plate 26.

Therefore, when the gas in the LPG container 1 is supplied in the forward direction, that is, from the high-pressure rubber hose 4 side, the ball 20 is placed in a floating state within the large diameter portion 10b by the spring pressure of the spring 18, and Side 1
It is in a state where it is separated from 0c and the communication hole is open.

Here, if the high pressure rubber hose 4 is destroyed for some reason or comes off the joint body 10, or if you forget to tighten the stop valve of another LPG container 1, please contact the supplier of the high pressure hose 4. be
Other than LPG container 1, including spare LPG container
There is a risk that gas will enter this area from the LPG container 1 and a large amount of gas will be released. However, due to this backflowing gas pressure, the ball 20 comes into contact with the valve seat surface 10c against the spring pressure of the spring 18, closing the communication hole 10a, thereby preventing a large amount of gas from being released. .

<<Effects>> As explained in detail using the embodiments above, in the case of the high pressure hose with a built-in check valve of this invention, in the normal state, the ball placed inside opens the valve by the spring pressure. Hold. If high-pressure gas flows back into the joint for some reason, the ball will move against the spring pressure and come into contact with the valve seat, closing the flow hole. Because of this, even in gas supply equipment that uses an automatic switching regulator, there is no possibility of a large amount of gas being released due to gas backflow caused by damage to a high-pressure hose, eliminating the fear of a major accident.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view of a joint connected to a high-pressure rubber hose according to this invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Figs. 3 a and b show gas supply equipment to which this invention is applied. It is an explanatory diagram. 2... Automatic switching regulator, 4... High pressure rubber hose, 10... Joint body, 10a... Distribution hole, 10
b...Large diameter part, 10c...Valve seat surface, 18...Spring, 20...Ball, 22...Adjustment screw.

Claims (1)

[Scope of utility model registration request] In a joint for joining a high-pressure hose connected to an LPG container to a gas pipe including an automatic switching regulator, one end A can be screwed into the gas pipe side airtightly,
A joint body whose other end B can be inserted into a high-pressure rubber hose and caulked; a ball that closes the flow hole by abutting against a valve seat having a tapered surface formed in the flow hole inside the joint body; a spring that biases the spring in the opening direction, and an adjustment screw that is screwed into the opening at one end A of the joint and comes into contact with the back of the ball to prevent the ball from coming out and to adjust the contact pressure of the ball with the spring. A high-pressure hose joint with a built-in check valve.