JP2000161592A - Gas purge device and gas purge device mounting vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas purge device and a gas pure device mounting vehicle extremely efficiently performing a purge work for a gas pipe. SOLUTION: This gas purge device which is provided with a gas introduction passage 2 connected to a purge pipe 6, a suction device K connected to the gas introduction passage 2, and a gas exhaust passage 3 connected to the suction device K, and a bypass passage 4 branched from the gas introduction passage 2, joined with the gas exhaust passage, and giving an opening/closing valve in the midway; a reel 8 for winding up and storing the purge pipe 6, and the purge device body are divided and arranged in the front/rear and the left/right directions, and various operation parts related to the purge device body are arranged in such a state as faced in the opposite direction to the dividing of the purge device body in the left/right direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas purge device for discharging gas present in a predetermined space, and a vehicle equipped with the gas purge device provided with the gas purge device.

[0002]

2. Description of the Related Art Conventionally, when discharging a gas having a pressure slightly higher than the atmospheric pressure, for example, in a gas pipe buried underground or in a gas tank, two types of devices are used. The discharge work was being performed sequentially. That is, a large-sized purge device that performs gas purging by using gas pressure inside a gas pipe buried underground (hereinafter referred to as “existing pipe”) or the like, and after purging gas to some extent, The gas purging operation of the gas pipe has been performed using two types of suction purge devices for forcibly sucking the gas remaining in the gas pipe. Specifically, first, the purge pipe of the large-sized purge device is connected to the existing pipe to perform gas pressure purging. At the beginning of the gas purge, the gas tries to spout out by itself because the gas pressure in the existing pipe is high. For this reason, the gas pressure purging operation is performed while limiting the outflow amount of the gas. When the gas purge proceeds and the pressure in the existing pipe becomes substantially equal to the atmospheric pressure, the gas in the existing pipe is not discharged at its own pressure. Therefore, the purge pipe of the large-sized purge device is removed, and the purge pipe of the suction purge device is connected instead. Then, the gas remaining in the existing pipe is forcibly sucked by the suction device.

[0003]

However, in order to perform the gas purging operation by the above-mentioned conventional method, it is necessary to carry a large-sized purge device and a suction purge device to the work site. In such a case, it is not only time-consuming to carry in these devices, but also it is necessary to reconnect these two devices in sequence, which makes the work complicated and limits the reduction of the manpower required for the work. Work cost was high. An object of the present invention is to solve the above-mentioned conventional problems and to provide a gas purge device and a vehicle equipped with the gas purge device, which can perform a gas pipe purging operation extremely efficiently.

[0004]

The features, functions and effects of the gas purge device and the vehicle equipped with the gas purge device according to the present invention will be described with reference to FIGS.

[0005] [Structure 1] In the gas purging apparatus of the present invention, the gas introduction path 2 connected to the purge pipe 6, the suction apparatus K connected to the gas introduction path 2, the suction apparatus K And a gas discharge path 3 connected to the gas supply path 2. The gas discharge path 3 is branched from the gas introduction path 2 to join the gas discharge path 3, and a bypass path 4 having an on-off valve in the middle is provided. [Effects] If a suction device and a bypass are provided as in this configuration, for example, when purging a space filled with high-pressure gas, the pressure of the high-pressure gas is initially used via the bypass. Gas purging. When the gas pressure in the space to be purged decreases and the gas in the space stops being released depending on the internal gas pressure, the on-off valve of the bypass passage is closed and the suction device is operated. Thus, the gas in the space can be suction-purged. That is, according to this configuration, the purging operation, which has been conventionally performed twice, can be continuously performed only by operating the on-off valve.
Work efficiency can be greatly improved. In addition, the entire purging device is made compact, and transportation and maintenance are facilitated.

[Structure 2] The gas purging apparatus of the present invention can be constructed by providing an activated carbon adsorption tower 13 in the gas introduction passage 2 in the gas introduction path 2. [Effects] If an activated carbon adsorption tower is provided as in the present configuration, if the gas to be purged has an odor, the odor can be removed, and the working environment can be favorably maintained.

[Structure 3] In the gas purging apparatus of the present invention, as described in claim 3, the suction device K can be constituted by an ejector type device. [Effects] The ejector type suction device of this configuration
In general, compressed air is injected from a thin tube at a high speed, and the gas inside the gas tube is sucked using the flow of the air. In this apparatus, no spark is generated because electricity is not used. For example, even when purging a combustible gas, there is no risk of ignition and the apparatus is safe.

[Structure 4] The gas purge device of the present invention can be formed by installing the suction device K inside the storage container 21, as described in claim 4. [Effects] By installing the suction device inside the storage container as in this configuration, for example, when the suction device is configured by an ejector, noise generated by the ejector can be reduced.

[Structure 5] The gas purge device of the present invention can be formed by mounting the activated carbon adsorption tower 13 on the upper part of the storage container 21, as described in claim 5. [Function and Effect] As in the present configuration, by mounting the activated carbon adsorption tower on the upper portion of the storage container, the gas purge device can be made compact. Further, by placing the activated carbon adsorption tower on the storage container, an effect of shielding noise generated by the ejector can be expected. That is, by covering the upper surface of the storage container with the activated carbon adsorption tower, the degree of vibration of the upper member of the storage container is suppressed, and even when the upper member vibrates, the activated carbon filled in the activated carbon adsorption tower reduces the vibration. This is because an absorbing effect can be expected.

[Structure 6] In a vehicle equipped with a gas purge device according to the present invention, a reel 8 for winding and storing the purge pipe 6 and a first on-off valve B1 connected to the purge pipe 6 are provided. And a suction device K connected to the gas introduction passage 2, a gas discharge passage 3 connected to the suction device K, and a branch from the gas introduction passage 2 to the gas discharge passage 3. A purge device main body S having a bypass passage 4 having a second opening / closing valve B2 in the middle thereof is provided, and the reel 8 and the purge device main body S are separately arranged in the front-rear direction X and the left-right direction Y. In addition, the first operation unit 27 related to the first opening / closing valve B1 and the second operation unit 28 related to the second opening / closing valve B2 are arranged in the left-right direction Y in a direction opposite to the direction in which the purge device main body S is distributed. Distribute for It can be configured.

[Operation and Effect] With this configuration, it is possible to balance the weight of the vehicle in front, rear, left and right,
Since the first operation unit, the second operation unit, and the like are all arranged toward one side of the vehicle, the operability of the purge device can be significantly improved.

[Structure 7] In a vehicle equipped with a gas purging apparatus according to the present invention, a tool storage 24 for storing tools required for purging a gas pipe is provided with the reel 8 and the purging apparatus main body. It can be configured to be mounted further behind S. [Effects] By mounting the tool storage behind the reel and the purging device main body as in the present configuration, the tool storage can be opened in, for example, three directions on both sides and the rear.・ Storage becomes easy. Further, since a driver's seat is present in front of the purging device main body and the tool storage is present in the rear of the purging device main body, the noise generated by the purging device is included in the front-rear direction X of the vehicle.
The noise which spreads to the surrounding work site can be reduced, and the adverse effect on the surrounding work site can be reduced.

[0013] As described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions.

(Outline) FIGS. 1 to 3 show the outline of the gas purge apparatus of the present invention. The gas purge device is a device used to discharge various gases existing in a specific space from the space and to replace the space with air, for example. That is, the gas purging apparatus of the present invention includes a gas introduction path 2 for introducing gas flowing out of the existing pipe 1, a suction device K connected to the gas introduction path 2, and a gas discharge path connected to the suction device K. And a bypass path 4 that branches off from the gas introduction path 2 and joins the gas discharge path 3. In the middle of the bypass 4, the second
An on-off valve B2 is provided. The gas introduction path 2, the gas discharge path 3, and the bypass path 4 are usually formed using a pipe member.

With the gas purging device, the existing pipe 1 is
It discharges, that is, purges the city gas existing inside the
The purging operation mainly includes two operations. That is, in a state in which the existing pipe 1 is filled with a high-pressure gas, the gas is supplied to the gas discharge opening 5, which is a gas outlet.
And try to squirt vigorously. That is, as a first stage operation, the internal gas is discharged using the high pressure of the gas. The purging operation is hereinafter referred to as gas pressure purging. When a certain amount of gas is discharged, the internal pressure of the existing pipe 1 decreases and becomes equal to the atmospheric pressure. In this state, the gas inside the existing pipe 1 cannot be discharged simply by opening the gas discharge opening 5. Therefore, as the operation of the second stage, the gas remaining in the existing pipe 1 is forcibly sucked using the suction device K. The purging operation is hereinafter referred to as a suction purge. The operation procedure of the gas pressure purge and the suction purge is as follows.

(Gas Pressure Purge) FIGS. 1 and 2 show the working conditions related to the gas pressure purge. First, the purge pipe 6 is connected to the existing pipe 1 to be gas-purged. Specifically, the distal end side connection portion 7 of the purge pipe 6 is connected to the gas discharge opening 5 of the existing pipe 1. Thereby, the gas in the existing pipe 1 is led to the gas purge device. The purge pipe 6 is formed of, for example, a pressure-resistant hose. In the present embodiment, the purge pipe 6 is a reel 8
When connecting to the existing pipe 1, the tip of the purge pipe 6 is extended to the gas discharge opening 5 of the existing pipe 1. On the other hand, a base end side connection portion 9 of the purge pipe 6 is connected to a purge pipe connection portion 10 provided at a distal end portion of the gas introduction path 2 according to the gas purge device. In FIG.
An example is shown in which two gas introduction paths 2 to be connected to the purge pipe 6 are provided. However, normally, only one of the gas introduction paths 2 is connected to the purge pipe 6. That is,
The other gas introduction path 2 not connected to the purge pipe 6
For example, when the amount of gas purge from the existing pipe 1 is large, the pipe is used by directly connecting to the distal end side connection portion 7 of the purge pipe 6. These two gas introduction paths 2
In the case of using either or both of them, the first opening / closing valve B1 provided in each gas introduction path 2 is operated.

The two gas introduction paths 2 are connected to the first on-off valve B
1 once merges, but immediately branches into a first introduction path 2a and a second introduction path 2b. The first introduction path 2
a is used for gas purging immediately after starting gas purging from the existing pipe 1, that is, in a state where the gas ejection pressure is high.
On the other hand, the second introduction path 2b is used for gas purging in a state in which gas purging has progressed to some extent and the momentum of gas ejection from the existing pipe 1 has been reduced. FIG. 1 shows a state in which the first introduction path 2a is used immediately after the start of gas purge.
FIG. 2 shows a state in which the second introduction path 2b is used in the latter half of the gas pressure purging operation.

As shown in FIG. 1, the first introduction path 2a includes:
High pressure release valve Bk and strainer 11, first silencer 1
2 is provided. In the state of FIG. 1, only the high-pressure release valve Bk is in the “open” state, and the low-pressure release valve Bt is “closed”.
There is a state. The strainer 11 is used for removing foreign matter in the purge gas. Immediately after the start of the gas pressure purge, foreign substances such as rust and dust accumulated inside the existing pipe 1 are likely to flow out with the force of the high pressure gas squirting. The first silencer 12 is for reducing noise when expanding the high-pressure gas. The purge gas reduced in pressure by the first silencer 12 is supplied to the activated carbon adsorption tower 1 further downstream.
It is led to 3.

On the other hand, in the second introduction path 2b,
Only the low pressure release valve Bt is provided. In the latter half of the gas pressure purge operation, the gas pressure gradually decreases and approaches the atmospheric pressure. Therefore, there is no gas momentum enough to cause foreign matter to be ejected from the existing pipe 1, and even if the ejected gas in this state is expanded to approach the atmospheric pressure, the noise is extremely small. Therefore, it is sufficient to provide only the low-pressure release valve Bt in the second introduction path 2b. The low pressure release valve B
When opening t, it is not necessary to dare close the high-pressure release valve Bk. Rather, as shown in FIG. 2, both the high-pressure release valve Bk and the low-pressure release valve Bt are set to the “open” state, and the gas is purged using both the first introduction path 2a and the second introduction path 2b. Thus, the purging operation can be further promoted.

The first introduction path 2a and the second introduction path 2b
Merge at an upstream position of the activated carbon adsorption tower 13. That is, the gas that has passed through both the first introduction path 2a and the second introduction path 2b passes through the activated carbon adsorption tower 13. Here, for example, odorous components contained in the gas, such as various hydrocarbons and sulfur components, are adsorbed.

The activated carbon adsorption tower 13 is filled with, for example, granular activated carbon or fibrous activated carbon. These granular activated carbon or fibrous activated carbon may be provided by mixing a plurality of types, respectively, or a mixture of granular activated carbon and fibrous activated carbon may be used. Hereinafter, these are collectively referred to as activated carbon 13a. It is convenient to form these activated carbons 13a in a cartridge type so that they can be easily attached and detached.
By using several types of activated carbon 13a in this way,
The activated carbon adsorption tower 13 capable of exhibiting the optimum performance according to the target gas to be deodorized can be configured. In addition, the gas purge capacity when using the amount of the activated carbon 13a is about 1
000 m3 / hour. With such a capability, the gas purging apparatus can be applied to gas purging of most city gas pipes. The activated carbon adsorption tower 1
The purge gas from which the odor has been removed after passing through 3 is discharged into the atmosphere via the bypass 4 and the diffusion tube 14.

(Suction Purging) As described above, after the internal pressure of the existing pipe 1 becomes substantially equal to the atmospheric pressure, the suction device K
A so-called suction purge for forcibly discharging gas remaining in the existing pipe 1 is performed by using the above method. FIG. 3 shows this state.

In the suction purge, the gas in the existing pipe 1 is sucked by a suction device K provided on the lower side of the activated carbon adsorption tower 13. As the suction device K, for example, an ejector-type device that ejects high-pressure air (hereinafter, simply referred to as “ejector 15”) is used. That is, the compressor 16 is connected to the suction device K, high-pressure air from the compressor 16 is injected in the ejector 15, and the gas inside the activated carbon adsorption tower 13 is caused to flow out by the high-speed airflow.

The compressor 16 is connected to a compressor connection 18 provided at an end of a high-pressure air supply pipe 17 of the suction device K. Two high-pressure air supply pipes 17 are provided similarly to the gas introduction path 2. That is, it is possible to select a case where only one high-pressure air supply pipe 17 is used or a case where both high-pressure air supply pipes 17 are used, according to the amount of gas to be sucked. Each of the high-pressure air supply pipes 17 is provided with a third on-off valve B3 for adjusting the amount of air injected by the ejector 15.

When using the suction device K, the second on-off valve B2 is set to a "closed" state. If the second on-off valve B2 is set to the "open" state, the internal pressures of the portions from the activated carbon adsorption tower 13 to the diffusion tube 14 are all equal through the bypass 4, so that the function of the ejector 15 is reduced. Because it is not demonstrated.

The air injected from the ejector 15 is
It is configured to reach the inside of the collecting container 19 after being expanded. Each ejector 15 is provided with a second silencer 20 for silencing. That is, these second silencers 20 are provided inside the collecting container 19. The bypass path 4 is connected to the collecting container 19. As described above, by using the collecting container 19, the bypass passage 4 for the gas pressure purge and the suction device K for the suction purge can be easily connected, which contributes to downsizing both devices. I have. Discharge of gas to the diffusion tube 14 also
This is performed via the collecting container 19. In addition,
The ejector 15 is also disposed inside the steel container 21 in order to ensure the noise reduction effect.
In the present embodiment, the storage container 21 is formed integrally with the collecting container 19. That is, a partition is provided inside the integrated container to separate them. By configuring the storage container 21 and the like using the steel plate having a certain weight, it is possible to suppress the noise of the ejector 15 from leaking to the outside. As a result, for example, it is possible to reduce the adverse effect of noise caused by the purging operation in a densely populated house or the purging operation at night.

Although the gas inside the existing pipe 1 can be sucked by the suction purge, it is necessary to replenish the inside of the existing pipe 1 with air or the like separately in order to smoothly perform the suction. As shown in FIG. 3, at the time of the suction purging operation, the suction opening 22 provided in the existing pipe 1 is opened. The suction opening 22 is provided at a position apart from the gas discharge opening 5 of the existing pipe 1. With this configuration, the residual gas inside the existing pipe 1 can be reliably sucked and discharged. Incidentally, the inner diameter of the air injection port provided in each ejector 15 is about 40 mm, and the gas discharge ability by the suction purge is smaller than that by the gas pressure purge.

In the collecting container 19, water generated when the air is expanded by the ejector 15 may accumulate. For this reason, a drain cock 23 for discharging the water is provided at the bottom of the collecting container 19.

(Car with Gas Purge Device) The gas purge device can be mounted, for example, on the bed of a vehicle. One example is shown in FIGS. As is apparent from these figures, the reel 8 in which the purge tube 6 is wound and housed, and the purge device main body S in which other devices are assembled are dispersed and arranged on the carrier 23.
In addition to the purging apparatus main body S, a tool storage 24 for storing various tools used for purging is installed at the rear end of the loading platform 23.

More specifically, the reel 8 and the purging apparatus main body S are mounted separately in the front-rear direction X and the left-right direction Y. That is, in the present embodiment, the reel 8 is disposed immediately behind the driver's seat 25 and
It was installed close to the left side of the car body. In particular, it is located on the left side when purging work while parking the vehicle on the roadway,
Normally, when assuming that the work is performed on the left side of the vehicle body and that the purge pipe 6 is pulled out from the reel 8, it is considered that the work closer to the edge 26 of the carrier 23 is easier to perform.

On the other hand, the purging device main body S is disposed behind the reel 8 and is also disposed close to the right side of the vehicle body. The reason for shifting to the right side is to firstly balance the weight with the reel 8 in the left-right direction Y. And
The purging apparatus main body S is provided with a first operating section 27 related to the first opening / closing valve B1 or a second operating section 28 related to the second opening / closing valve B2. That is, this is based on the reason that in the present embodiment, it is necessary to be able to operate from the left side of the vehicle body, and further, that it is necessary to prevent these operation parts from protruding to the side of the vehicle body. . In addition, the gas purge device main body S is provided with a flow meter and the like indicating the gas flow rate in addition to the operation section. Of course, these instruments are also configured to be visible from the left side of the vehicle body.

In order to ensure the running stability of the vehicle, it is necessary to consider the weight distribution of the vehicle in the vertical direction. In this embodiment, in particular, the activated carbon adsorption tower 13 is mounted on the upper part of the storage container 21 in the portion related to the purge device main body S. As in this configuration, the storage container 21 is the largest member and is made of steel and has the largest weight. Therefore, the activated carbon adsorption tower 13 having the next largest volume and weight is placed on the storage container 21. As shown in FIGS. 4 and 5, the first silencer 12 having a relatively large capacity and weight is also mounted on the storage container 21.

As described above, the activated carbon adsorption tower 13 is mounted on the storage container 21 so that the ejector 15
The effect of shielding the noise generated in the area can also be expected. That is,
By covering the upper surface of the storage container 21 with the activated carbon adsorption tower 13,
The degree of vibration of the upper surface member of the storage container 21 is suppressed, and even when the upper surface member vibrates, the activated carbon adsorption tower 1
The vibrations are absorbed by the activated carbon 13a filled in 3.

The tool storage 24 is provided at the rearmost part of the vehicle body as described above. The tool storage 24 is configured to open at least rearward and leftward to enhance workability. Of course, if the opening is provided on the right side, the workability is further improved. The tool storage 24 also has the effect of reducing the noise. That is, since the purge device main body S is disposed between the driver's seat 25 and the tool storage 24, an effect of shielding noise that tends to diffuse in the front-rear direction X of the vehicle body is exhibited. As a result, it is possible to reduce the effect of noise on the periphery of the work site. In addition, construction signs and lights are provided on the rear surface of the tool storage 24 to ensure safety during a purge operation.

(Effect) According to the present invention, the suction device K for performing the suction purge is provided with the bypass passage 4 for performing the gas pressure purge. Since the suction purge operation can be performed continuously, the efficiency of the gas purge operation can be significantly improved. Further, since the two types of purging devices are mounted on a single vehicle in a combined state, the purging device can be easily transported, handled, maintained and inspected.

[Alternative Embodiment] In the above embodiment, an example was shown in which gas was purged from the existing pipe 1 for city gas buried underground, but the present invention is not limited to this embodiment.
For example, it can be used for gas purging of the inside of a gas tank or for manholes for various operations, and the target gas is also various flammable gases such as natural gas, methane gas, propane gas, coke oven gas, city gas, etc. The present invention is applicable to various gases such as gas, sulfur gas, and vapor gas generated in an oil refining plant.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a purge operation state using a gas purge device of the present invention.

FIG. 2 is an explanatory view showing a purge operation situation using the gas purge device of the present invention.

FIG. 3 is an explanatory view showing a purging operation using the gas purging apparatus of the present invention.

FIG. 4 is a side view showing a vehicle equipped with the gas purge device of the present invention.

FIG. 5 is a plan view showing a vehicle equipped with a gas purge device of the present invention.

[Explanation of symbols]

 2 Gas introduction path 3 Gas discharge path 4 Bypass path 6 Purge pipe 8 Reel 13 Activated carbon adsorption tower 21 Storage container 24 Tool storehouse 27 First operation unit 28 Second operation unit B1 First on-off valve B2 Second on-off valve K Suction device S Purge device body X front-back direction Y left-right direction

Claims (7)

[Claims] 1. A gas introduction path connected to a purge pipe, a suction device connected to the gas introduction path, and a gas discharge path connected to the suction device, wherein the gas discharge path branches off from the gas introduction path. A gas purge device that joins a passage and has a bypass passage having an on-off valve on the way. 2. The gas purging apparatus according to claim 1, wherein an activated carbon adsorption tower is provided in the gas introduction path. 3. The gas purging device according to claim 1, wherein the suction device is an ejector type device. 4. The gas purge device according to claim 3, wherein the suction device is provided inside a storage container. 5. The gas purging apparatus according to claim 4, wherein the activated carbon adsorption tower is mounted on an upper portion of the storage container. 6. A vehicle equipped with a gas purge device equipped with a gas purge device, comprising: a reel for winding and storing a purge tube; and a gas introduction passage connected to the purge tube via a first on-off valve. A suction device connected to the gas introduction passage, a gas discharge passage connected to the suction device, and a bypass passage branching from the gas introduction passage and joining the gas discharge passage, and having a second on-off valve in the middle thereof. A purging device main body, wherein the reel and the purging device main body are arranged and mounted in the front-rear direction X and the left-right direction Y, and a first operation unit and the second opening / closing unit related to the first on-off valve A vehicle equipped with a gas purge device, wherein a second operation unit related to a valve is arranged in the left-right direction Y in a direction opposite to the direction in which the purge device main body is sorted. 7. The vehicle according to claim 6, wherein a tool storage for storing a tool necessary for purging a gas pipe is mounted further rearward with respect to the reel and the purge device main body. .