JPH0222667Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a high-pressure piping section installed in an LPG automobile from an LPG container to a vaporizer in front of the engine.

[Prior art] The high-pressure piping section of LPG vehicles is required by law to
An airtightness test is performed by applying Kgf/cm ² of air or nonflammable gas into the pipe, and it is mandatory for the pipe to pass the test.

One of the conventional airtightness inspection methods for a high pressure piping section will be explained with reference to FIG. 10. An LPG container 1 to a vaporizer 2 are connected by a high pressure piping section 3. The high-pressure piping section 3 connects a take-out valve 4 of the LPG container 1, a filter 5, and a shutoff valve 6 with pipes in order to reach the vaporizer 2. Note that the vaporizer 2 and the engine 16 are connected through a pipe 17.

In the illustrated example, the pipes 7 and 13 of the high-pressure piping section 3, particularly the mounting end 8 between the take-out valve 4 and the pipe 7, the mounting end 9 between the filter 5 and the pipe 7, the filter 5 and the cutoff valve 6, and the short pipes. The mounting ends 11 and 12 between the valve 10, the mounting end 14 between the shutoff valve 6 and the pipe 13, and the mounting end 15 between the vaporizer 2 and the pipe 13 are subject to airtightness inspection.

One of the conventional airtightness inspection methods was as follows. First, the take-out valve 4 is closed and the filling valve 51 is opened to fill the LPG container 1 with gas for airtightness testing at a predetermined pressure, and after the gas filling is completed, the filling valve 51 is closed. Next, when the take-out valve 4 is opened with the shut-off valve 6 and the vaporizer 2 closed, high-pressure airtightness test gas flows from the LPG container into the pipe 7, passes through the pipe 7, the filter 5, the short pipe 10, and the shut-off valve 6. and mounting ends 8, 9, 11, 12
An airtight inspection will be conducted. Next, when the shutoff valve 6 is opened, the airtightness test gas flows into the pipe 13.
3 and the mounting ends 14, 15 are tested for airtightness. If the shutoff valve 6 is opened in advance, the high pressure piping section 3
The entire airtightness test is carried out at once. In the above-mentioned inspection method, it is necessary to fill the large LPG container 1 with airtightness inspection gas at a predetermined pressure every time the inspection is carried out.
This required a large amount of airtightness testing gas and was extremely uneconomical.

In order to avoid the uneconomical nature of the above-mentioned airtightness testing method, an airtightness testing method as shown in FIG. 11 was devised.
In FIG. 11, the same parts as in FIG. 10 are indicated by the same numbers. This airtightness inspection method involves removing the high pressure piping section 3 from the vaporizer 2 at the mounting end 15,
As shown in the figure, the airtightness test gas is connected to the airtightness test gas pipe 52, the cutoff valve 6 is opened, the take-out valve 4 is closed, and the airtightness test gas is supplied under pressure from the airtightness test gas pipe 52 to the high pressure piping section 3, and the test is performed. Mounting end 1 after completion
5 is removed from the airtightness test gas pipe 52 and reattached to the vaporizer 2. Although this testing method requires only a small amount of gas for airtightness testing, it has the disadvantage that it is not possible to check the airtightness at the mounting end 15.

[Problems to be solved by the invention] The present invention solves the above-mentioned drawbacks of the conventional airtightness testing method, such as the use of a large amount of airtightness testing gas and the inability to confirm the airtightness of the installation end. This problem was solved by having a structure installed in the high-pressure piping section, and it is easy to install without requiring special space at the desired location of the high-pressure piping section.
A valve for piping airtightness inspection is installed that allows for easy airtightness inspection, does not cause the airtightness of the valve to be destroyed after the inspection, and can be used as a high-pressure piping part while being attached to the high-pressure piping part. The objective is to provide a high-pressure piping section with high pressure.

[Means for solving the problem] In order to solve the above-mentioned problem, the present invention uses LPG
A valve for airtightness inspection is connected in a series in a conduit of a high-pressure piping section between an LPG container and an engine in an automobile at piping connection ports at both ends of a flow hole penetrated through the valve body, The valve body is provided with a hose connection port for supplying airtightness test gas that communicates with the communication hole through the communication hole, and the valve body inserted into the communication hole is placed in the communication position when pressurizing the airtightness test gas. The valve structure is such that it can be in the shutoff position except during airtightness inspections.

[Function] Since the present invention has the above-mentioned configuration, the airtightness inspection valve (hereinafter abbreviated as inspection valve)
A gas pipe for airtightness testing is connected to the hose connection port of. First, the take-out valve and the vaporizer are closed, the shutoff valve is opened, the inspection valve is opened, and pressurized gas for airtightness testing is injected into the high-pressure piping section, and the high-pressure piping section is pressurized to perform the airtightness inspection. After the airtightness test is completed, the pressure is maintained inside the high pressure piping.
Close the inspection valve and remove the gas pipe for airtightness inspection from the hose connection port of the inspection valve.

If the pressure inside the high-pressure piping is maintained in this state, the airtightness of the inspection valve, hose connection port, etc. can be confirmed. After confirming the airtightness of the hose connection port, etc. of the inspection valve, for further safety, a blind plug is screwed into the hose connection port, etc. of the test valve to seal it.

Through the above-mentioned inspection process, the airtightness of the high-pressure piping section 3 can be completely and easily performed, and the airtightness of the high-pressure piping section 3 can be ensured. Therefore, the drawbacks of conventional inspection methods can be overcome.

[Example] Fig. 9 shows an example of implementation, in which the LPG container 1 installed on the body of an LPG car (not shown) is shown.
and the engine 16 are communicated through a high-pressure piping section 3, and the pipeline of the high-pressure piping section 3 reaches the filter 5 through a pipe 7 from the take-off valve 4 of the LPG container 1.
It passes through the valve 18 for airtightness inspection and reaches the shutoff valve 6.
A pipe 13 leads to the vaporizer 2, and a pipe 17 leads to the engine 16.

The first example of the above-mentioned airtightness inspection valve 18 is as follows:
It is of the needle type shown in Figure 1,
As shown in the figure, the valve body 53 is provided with L-shaped pipe connection ports 21 and 22.
The communication hole 23 that communicates between the valve body 5 and the valve body 5
3 and is bored in an L shape. Further, a hose connection port 24 for supplying gas for airtightness testing, which communicates with the communication hole 23 via a communication hole 29, is provided in the valve body 53, and can further communicate with the communication hole 29 when pressurizing gas for airtightness testing. A needle valve 25 is provided so as to be movable back and forth via a set screw 26, and can be shut off during and after the airtight inspection. Gas leakage from the needle valve 25 to the set screw 26 side is prevented by an O-ring 27 attached to the needle valve 25. The piping connection port 21,
A male thread 28 for connecting to the high-pressure piping section 3 is formed on the outer periphery of the pipe 22, and a female thread 30 for connecting a hose for supplying airtightness test gas is formed at the hose connection port 24. Each of the screws 28 and 30 is formed of a pipe connection screw such as a taper screw or a flare screw.

The needle valve 25 is moved forward and backward by being rotated by a driver 31 from outside the valve body 53 during an airtight inspection. After the air tightness test, the blind plug 32 is screwed to keep the needle valve 25 closed. Further, after the airtightness test is completed, a blind plug 33 is also screwed onto the hose connection port 24 from which the hose for airtightness test gas has been removed to ensure leakage prevention.

The above-mentioned airtightness inspection valve 18 is connected to the high pressure piping section 3.
By adopting an airtight inspection structure for the high pressure piping section installed in any of the locations, the legally required airtightness inspection of the high pressure piping section 3 can be carried out extremely easily. There is no leakage from the valve 18, and the valve 18
It can be used without any problem as a high-pressure piping part of an LPG vehicle with the product installed.

A second example of the valve 18 for airtightness inspection shown in FIG. 2 is of the seat packing type. In this example, pipe connection ports 21, 22, gas flow hole 23, hose connection port 24, pipe connection male thread 28, communication hole 29, hose connection female thread 30, driver 31, blind plug 3
Each structure of 2 and 33 is the same as that of the first example. The difference is that a spindle 34 that can move forward and backward is provided in place of the needle valve 25 of the previous example. A seat gasket 35 for blocking the communication hole 29 is attached to the tip of the spindle 34, and the communication hole 29 is blocked or opened by rotating the spindle 34 back and forth using a driver 31. Note that gas leakage from the side surface of the spindle 34 is prevented by the O-ring 36.

A third example of the valve 18 for airtightness inspection shown in FIG.
Instead of the piping connection ports 21 and 22 arranged in a letter shape,
A straight type valve is shown in which pipe connection ports 37 and 38 are disposed on the same axis on the valve body 54. Therefore, the communication hole 39 formed in the valve body 54 is also formed in a straight line, and the hose connection port 40 and the valve body 41 made of the needle valve 25 or spindle 34 of the above example are provided in a direction perpendicular to the communication hole 39. It is something that

In the fourth example of the airtight test valve 18 shown in FIG. 4, a ball valve type airtight test valve is shown. Piping connection ports 21, 22,
Communication hole 23, piping connection male thread 28, communication hole 29
is the same as the first example. In this example, a ball valve 42 is used to open and close the communication hole 29. The ball valve 42 can be opened and closed via a spindle 43. The spindle 43 is rotatable by a driver 31 at its outer end. The ball valve 42 is mounted and held by an insert 44, and a hose connection port 45 is provided on the outside of the insert 44. Further, an insert 46 is attached to attach and hold the spindle 43. Note that a seat gasket 47 is installed to prevent leakage at the ball valve 42, and an O-ring 48 is installed to prevent leakage at the spindle 43. After the airtightness test is completed, connect the hose connection port 4.
Similarly to the first example, the blind plug 49 is screwed onto the hole 5.

In this example, a blind cap 60 is attached to the spindle attachment port 50. The blind cap 6
A packing 61 is attached to the contact surface of the spindle mounting port 50 to further prevent leakage from the spindle 43.

A fifth example of the air tightness check valve 18 shown in FIG. 5 is a back check valve type. A valve body 63 is installed to open and close a communication hole 62 that communicates with a communication hole 39 formed between straight type piping connection ports 37 and 38 similar to the third example. The valve body 63 is attached to the bottom of the hose connection port 64, and is normally closed by a spring 65.
The valve seat 66 on the fourth side is urged to come into contact with the valve seat 66 to prevent gas leakage from the flow hole 39.

The valve body 63 is supplied with pressurized airtightness testing gas from the airtightness testing gas pipe 19 connected to the hose connection port 64, and the pressure inside the flow hole 39 is within a limit lower than the supply pressure by a predetermined pressure difference. Then, the valve body 63 is pushed in from the valve seat 66 by the supply pressure, the airtightness test gas continues to flow in, and when the airtightness test gas pipe 19 is removed, the pressure inside the flow hole 39 and the attachment of the spring 65 are reduced. The force presses the valve element 63 against the valve seat 66 like a check valve, thereby preventing gas leakage. Even when the valve body 63 is used as the high-pressure piping section 3, the urging force of the spring 65 keeps the valve body 63 in contact with the valve seat 66 at all times.

In the sixth example of the valve 18 for airtightness inspection shown in FIG. 6, the valve body 67 and valve seat 68 of the check valve pipe are different in shape from the valve body 63 and valve seat 66 of the fifth example. The airtightness check valve provided is shown. The valve body 67 is always urged by a spring 69 in a direction to come into contact with the valve seat 68.

The spring 69 urges the valve body 67 via a washer 70, and the valve seat 68 is integrally formed with a hose connection port 71, which is connected to the valve body 76 via a packing 75. It is screwed tightly to the The operation of the valve body 67 is based on the fifth
It is similar to the example in .

A seventh example of the airtight inspection valve 18 shown in FIG. 7 is a ball check valve pipe. A ball 72 is installed in place of the valve body 63 of the fifth example, and the ball 72 is always supported by a spring 73.
The valve seat 66 is urged to come into contact with the valve seat 66 by the valve seat 66.

Note that the fifth to fifth valves 18 for airtightness inspection mentioned above
In each of the seventh examples, after the airtightness test is completed, a blind plug 74 is screwed onto the hose connection port 64 or 71 to prevent gas leakage and to prevent external contact with the valve body 63, 67 or ball 72 of the check valve type. We are trying to prevent contact from people.

The eighth example of the valve for checking the airtightness of piping shown in FIG. This is the type that is used.

The airtightness testing gas inlet 78 is covered with the rubber tube valve 77 and is formed integrally with the hose connection port 79 and protrudes into the communication hole 80 . 8
2 is screwed tightly.

Note that a blind plug 83 is screwed into the hose connection port 79 after the inspection is completed.

A ninth example of the valve 18 for airtightness inspection shown in FIGS. 12 and 13 has a structure in which an O-ring 85 is fitted to a valve body 84 in place of the valve body 67 of the sixth example. The other configurations are the same as in the sixth example. The right half of FIG. 13 shows the open state of the valve body 84 when airtightness testing gas is introduced into the flow hole 39, and the left half of the figure shows the valve body that maintains the airtightness of the flow hole 39 when the gas stops flowing. 84 is shown in the closed state.

A tenth example of a valve for airtightness inspection shown in FIGS. 14 to 20 uses a three-way connector 86 as shown in FIG. , as shown in FIGS. 14, 15, and 19, the three-way connector 8
6 and a well-known one-touch coupling main body 88 for connecting a pressurized hose for supplying airtightness testing gas as shown in FIG. 18. However, it is necessary to slightly enlarge the end surface of the connection portion of the coupling body 88 with the plug 87 and to appropriately change the set load of the spring attached to the coupling body 88.

In addition, for the plug 87, FIG.
As shown in FIG. 17, by threading a plug cap 90 containing an O-ring 89, the airtightness of the plug 87 after the airtightness test can be maintained doubly.

In this example, since the pressurized hose for airtightness inspection is connected with a one-touch coupling, the hose can be easily attached to and detached from the plug 87.
Workability is improved, and there is no need for a stop valve on the hose side for supplying and disconnecting airtightness testing gas.

In this example, by using the three-way connector 86, it is possible to connect to the middle of the high pressure piping section 3 as shown in FIG. 9, but as shown in FIG. By using LPG other than high pressure piping section 3
Can be attached directly to equipment.

The valve 18 for airtightness inspection in the embodiment shown in FIG. 9 may be installed at any point in the pipeline of the high-pressure piping section 3 or in the LPG equipment such as the take-out valve 4 and the vaporizer 2.

The airtightness testing method of the airtightness testing structure of the high pressure piping section 3 equipped with the airtightness testing valve 18 is carried out as follows. The airtightness inspection gas pipe 1 is connected to the inlet 20 of the airtightness inspection valve 18.
9 are connected. First, the take-out valve 4 and the vaporizer 2 are closed, the cutoff valve 6 is opened, the airtightness test valve 18 is opened, and the pressurized airtightness test gas is injected into the high-pressure piping section 3. Pressurize and check for airtightness.

After the airtightness test is completed, the airtightness test valve 18 is closed while the pressure is maintained in the high pressure piping section 3, and the airtightness test gas pipe 19 is removed from the inlet 20 of the airtightness test valve 18.

If the pressure inside the high-pressure piping section 3 is maintained in this state, the airtightness of the injection port 20 of the airtight inspection valve 18, etc. can be confirmed. After confirming the airtightness of the inlet 20, etc. of the airtightness inspection valve 18, for further safety, the airtightness inspection valve 1 is
A blind plug is screwed into the injection port 20 etc. of No. 8 to seal it.

[Effect] The present invention has the above-mentioned structure and operation,
The airtightness inspection valve that is always attached to the high-pressure piping section of an LPG vehicle makes it possible to easily pressurize and seal the piping airtightness inspection gas into the high-pressure piping section during an airtightness inspection, making it easy to perform airtightness inspections of the high-pressure piping section. After the airtightness test, there is no problem in operating the LPG vehicle with the airtightness test valve installed, and the fact that no leakage occurs from the high pressure piping section indicates that the airtightness test of the high pressure piping section has been completed. After that, with the airtightness test gas pressurized in the piping section, close the valve body of the airtightness test valve, and remove the airtightness test gas pipe from the hose connection port of the valve to confirm. In addition, since the valve for airtightness inspection is lightweight and small, it can be installed at any position from the installation end of the take-out valve of the high-pressure piping section to the installation end of the vaporizer.
It can be installed directly on equipment such as LPG containers and vaporizers, and can be used whenever re-inspection is necessary. Only a small amount of airtight gas is used during airtightness inspections, and high-pressure piping parts can be airtightly inspected. Therefore, there is no need to remove it at all, and various excellent effects can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a first example of a valve for airtightness inspection, Fig. 2 is a sectional view of the second example of the same as above, Fig. 3 is a perspective view of the third example of the same as above, and Fig. 4 is a sectional view of the same as above. A cross-sectional view of the fourth example; FIG. 5 is a cross-sectional view of the fifth example;
The figure is a partial cross-sectional view of the sixth example of the same as above, FIG. 7 is a cross-sectional view of the seventh example of the same as above, FIG. 8 is a cross-sectional view of the eighth example of same as above, and FIG. Fig. 10 is an explanatory diagram of piping showing a conventional inspection method, Fig. 11 is an explanatory diagram of piping showing another conventional inspection method, and Fig. 12 is a front view of a ninth example of a valve for airtightness inspection. 1st
Figure 3 is a sectional view taken along the line in Figure 12, Figure 14 is a side view of the plug used in the tenth example of the valve for airtightness inspection, Figure 15 is a top bottom view of the same, and Figure 16 is a diagram of the same plug cap. Plan view, Figure 17 is the first
Figure 6 is a cross-sectional view of the bending line, Figure 18 is a perspective view of the coupling used in the above example, and Figure 19 is a cross-sectional view of the bending line.
20A and 20B are diagrams showing the connection relationship between the plug and the connector of the same example. 1: LPG container, 3: High pressure piping section, 16: Engine, 18: Valve for airtightness inspection, 21, 22,
37, 38: Piping connection port, 23, 39: Distribution hole,
24, 40, 45, 64, 71, 79: Hose connection port, 25: Needle valve, 29, 62, 80: Communication hole, 34: Spindle, 41, 63, 67: Valve body, 42: Ball valve, 53, 54,76,8
2: Valve body, 72: Ball, 77: Rubber tube.

Claims (1)

[Scope of utility model registration request] In an LPG vehicle, a valve for airtightness inspection is connected in a series in the high-pressure piping line between the LPG container and the engine at the piping connection ports at both ends of the flow hole penetrated through the valve body. The valve body is provided with a hose connection port for supplying airtightness test gas that communicates with the communication hole through the communication hole, and the valve body inserted into the communication hole is placed in the communication position when the airtightness test gas is pressurized. , The high-pressure piping section of an LPG vehicle has a valve structure that can occupy the shutoff position except during airtightness inspections.