JPH09317637A - Pump device of internal combustion engine drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: Not to spoil transportation and workability even if adding a communicating conduit. SOLUTION: This pump device is furnished with an internal combustion engine 30, a pump 60 driven by this internal combustion engine 30 and a case body 100 to store these internal combustion engine 30 and pump 60, and it is constituted to generate vacuum suction force by air suction of this pump 30. In this case, communicating conduits 101, 102, 103 to communicate an air suction conduit 51 of the internal combustion engine 30 and an air suction conduit 52 of the pump 60 to each other are furnished, and these communicating conduits are arranged and provided in the inside of the case body 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device for driving a pump by an internal combustion engine, and more particularly to an internal combustion engine driven pump device for supplementing the intake air of the pump with the intake air of the internal combustion engine. Such a pump device is used as a source of a vacuum suction force generated by suction. For example, it is used for a soil excavating device that uses a vacuum suction force to excavate soil without damaging an existing underground embedding material when excavating earth and sand by installing or repairing an underground burial pipe.

[0002] Alternatively, in order to remove earth and sand and muddy water stored in the pipe due to an earthquake, etc.
Rubbing inside pipes when sucking dust inside pipes as a cleaning prior to sealing inside pipes, when sucking resin lining inside pipes, when recovering and cleaning sand after sanding of pipe fittings and valves, etc. The vacuum suction force should be applied when suctioning the pig in the pipe after shot blasting to remove silica sand and rust, and when suctioning the parachute and sponge pig in the pipe for cleaning such as draining water and removing foreign substances. Demonstrate.

The field of soil excavation in which a pump device driven by an internal combustion engine is used will be described in detail. To dig up or dig up asphalt pavement etc., a crusher that forcibly hits a hammer with compressed air,
Generally, a power shovel or the like that scoops up strongly with a large bucket is used. However, while they are strong and have good working efficiency, they have a disadvantage in that they make a large impact noise and noise. In addition, if the buried pipe or the like is already installed underground and is accidentally touched, it may cause inconvenience such as destruction or extreme deformation of the contacted portion. Therefore, when excavating in the ground so that it can be made in time even if it does not have that much excavation capacity, a crusher that can be operated by hand and a vacuum excavator are also used so that the buried pipe etc. will not be broken. ing.

As such a handy crusher, the one described in Japanese Utility Model Laid-Open No. 59-160174 is known. In this crusher, a chisel blade is provided at the tip of a cylindrical body extending downward from the handle portion, and a passage for sending compressed air supplied from a compressor to the tip of the chisel blade is provided, and a part of the compressed air is provided at the chisel blade portion. Is provided with an injection port for injecting. Then, in addition to mechanical crushing with a chisel blade, the crushing of the soil is also carried out by blowing off or subdividing the soil with compressed air injected from near the chisel blade.

As such a vacuum excavator, for example, the one described in Japanese Patent Application Laid-Open No. 58-222228 is known. This vacuum excavator is equipped with a suction port for earth and sand at the tip of a vacuum hose which is in communication with a suction blower. Then, when the worker brings the earth and sand suction port of the hose close to the soil surface of the excavation target,
The suction force from the blower sucks up the earth and sand there. As a result, the soil can be dug up without damaging or destroying the buried object in the soil.

The crusher and the vacuum suction device are often used at the same time. This is because, if the soil is first crushed by a crusher to make it suitable for suction, and then the soil is suction-transferred by a vacuum excavator, the advantages of both can be utilized and efficient work can be performed. Further, for example, there is a soil excavating device in which a crushing section and a suction transfer section are integrated as in the embodiment of Japanese Patent Application No. 3-123040. This is to excavate the soil by performing both supply of compressed air to the crushing section and vacuum suction from the suction transfer section with a pump device driven by an internal combustion engine.

[0007]

2. Description of the Related Art Such a pump device driven by an internal combustion engine includes an engine (internal combustion engine) and a compressor (pump).
Are housed in the same housing, and compressed air is supplied and vacuum suction is performed by an engine-driven compressor. At least a vacuum suction force (negative pressure suction force) is generated. That is, at least one compressor or blower is provided in order to function as a generation source of the vacuum suction force, and further, an engine, not a motor, is provided due to a restriction of received electric power, etc. It is designed to drive a compressor.

[0008]

However, in such a conventional pump device driven by an internal combustion engine, a built-in engine and a compressor having a larger size and a larger output are more expensive, so that there is a certain cost constraint. However, it is not possible to use a large one, and it is necessary to use a relatively small one. Therefore, the vacuum suction force is limited. Alternatively, not only the vacuum suction force but also the supply amount of the pressure gas is limited. Due to this, it has been difficult to raise the efficiency of the soil suction and transfer work and the pipe suction work to a certain level or higher.

Therefore, in order to solve the problem, the invention of Japanese Patent Application No. 7-82410 was made by the same applicant. This was devised and devised with a focus on the fact that the intake and exhaust of the engine are not effectively used.In short, the intake of the engine should be used in addition to the intake of the compressor as the source of the vacuum suction force. As a result, the vacuum suction power is enhanced. Specifically, a commercially available conventional pump device driven by an internal combustion engine is modified by adding a communication conduit or the like for communicating the intake air of the internal combustion engine with the intake air of the pump.

By the way, a flexible pipe containing a coiled wire or the like is generally used for such a communicating pipe, because in addition to easiness of piping, a resistance against crushing due to negative pressure is required. To be Then, the pipe end is fixed by welding or fastening with a hose band or the like so as not to fall off due to a vacuum suction force or vibration.

However, when the conventional pump device is modified into the pump device of the above invention by adding such a communication pipe, if the communication pipe is provided outside the housing of the pump device, it is necessary to transport the device. It is an inconvenience because it bothers you. Furthermore, the work may be an obstacle when setting the soil suction unit or the like, or during the work of excavating the soil. Therefore, when modifying a general-purpose pump device to increase the vacuum suction force,
The problem is to add a communication conduit so that it does not get in the way.

Further, since the pipe containing the wire is troublesome to cut, it takes a lot of man-hours when the conventional pump device is modified into the pump device of the invention. However, if the number of man-hours is too large, the cost will be substantially increased, and the meaning of inexpensively enhancing the vacuum suction force by modifying a small-sized device will be inconvenient. Therefore, it is also an issue to devise a device that can be easily and quickly modified without much effort.

Further, depending on the contents of the work using the pump device, it may be desired to use the conventional pump device for other purposes after the work requiring a large vacuum suction force by the pump device of the invention. is there. In such a case, it would be convenient if the conventional pump device could be modified to the pump device of the above invention, or conversely, the pump device of the above invention could be returned to the conventional pump device.
However, if the communication conduit is welded or band-tightened, the modification work is troublesome. Therefore, it is a further problem to improve the availability of the pump device driven by the internal combustion engine by devising a communication conduit that can be easily modified.

The present invention has been made in order to solve such a problem, and an object thereof is to realize a pump device of an internal combustion engine drive which does not impair transportation and workability even if a communication conduit is added. To do. Another object of the present invention is to realize a pump device driven by an internal combustion engine, which can be easily modified from a general-purpose product. Another object of the present invention is to realize a pump device driven by an internal combustion engine, which can be easily modified bidirectionally.

[0015]

Means for Solving the Problems First to third solving means invented to solve such problems are as follows.
The configuration and operation and effect will be described below.

[First Solution] An internal combustion engine driven pump device of the first solution (as described in claim 1 at the beginning of the application) includes an internal combustion engine and a pump driven by the internal combustion engine. In an internal combustion engine-driven pump device that includes an internal combustion engine and a housing that houses a pump, and that generates a vacuum suction force by intake air of the pump, the intake pipe line of the internal combustion engine and the intake pipe line of the pump are connected to each other. It is characterized in that it is provided with a communication conduit which is provided and disposed in the housing.

In the pump device driven by the internal combustion engine according to the first means as described above, since the intake air of the internal combustion engine is made to communicate with the intake air of the pump by the communication conduit, the vacuum suction force is generated. Not only is this done by the intake air of the internal combustion engine. As a result, the intake amount increases and the vacuum suction force is enhanced.

Moreover, this communication line is housed in the same housing together with the internal combustion engine and the pump. This makes it possible to avoid the inconvenience caused when the communication conduit is provided outside the casing of the pump device. That is, the communication conduit does not interfere with the transportation of the device, and the communication conduit does not interfere with the work when setting the soil suction unit or the like or during the soil excavation work.

Therefore, according to the present invention, even if a general-purpose pump device is modified to add a communication conduit for enhancing the vacuum suction force, the communication conduit does not impair the transportation and workability. It is possible to realize a pump device driven by an internal combustion engine having various configurations.

[Second Solving Means] The internal combustion engine driven pump device of the second solving means (as described in claim 2 at the beginning of the application) is the first internal combustion engine driven pump device,
The communication conduit includes a non-metallic curved pipe part having flexibility at all or at least an end portion, and a non-metal solid straight pipe part connected to the non-metallic curved pipe part. Is.

The term "non-metallic" as used herein means that it is made of a material such as plastic that is easier to cut and mold than metal such as steel, and even concrete that is difficult to process. Not included.

In the pump device driven by the internal combustion engine according to the second means, the communication pipe line is formed by connecting the solid straight pipe portion and the flexible curved pipe portion. Even in the case where there are many restrictions on piping, it is relatively easy to sew and arrange the gaps of the internal combustion engine, the pump, and its accessories. Further, in such a structure, the straight pipe portion that occupies most of the communication pipe line is solid, and the flexible curved pipe portion that is easily deformed by pressure or the like is required only locally. Even if a negative pressure suction force acts on the inside of the pipe, the communication pipe line is not crushed.

Moreover, since the communication conduit is made of non-metal and does not contain wire or the like, cutting work and the like during piping can be facilitated. As a result, even when the conventional pump device is modified to the pump device of the present invention, it can be performed easily and quickly with a small number of steps.

Therefore, according to the present invention, it is possible to realize an internal combustion engine driven pump device which is easily remodeled from a general-purpose product when the communication conduit is provided in the housing.

[Third Solving Means] An internal combustion engine driven pump device of the third solving means (as described in claim 3 at the beginning of the application) is a first internal combustion engine driven pump device,
The communication conduit includes a curved pipe portion having flexibility at least or at least in an end portion, and a solid straight pipe portion having an end portion fitted to the end portion thereof. The pipe portion is characterized in that it has means for abutting the fitting side end surface of the straight pipe portion to prevent further movement thereof.

In the pump device driven by the internal combustion engine according to the third means as described above, the communication pipe line is constituted by connecting the solid straight pipe portion and the flexible curved pipe portion. As described above, even in the case where there are many restrictions on piping, the arrangement is easy and the crushing does not occur.

Moreover, the connection is made by fitting the end portion of the curved pipe portion and the end portion of the straight pipe portion. When these are fitted together, the fitting side end surface of the straight pipe portion is bent pipe. Abutting means for blocking movement in the section. Then, the straight pipe portion is prevented from moving toward the curved pipe portion beyond it. Therefore, at the time of connecting work by fitting and during the subsequent operation of the device, a negative pressure suction force acts on the communication conduit to deepen the fitting between the straight pipe portion and the curved pipe portion. Even in such a case, the fitted state is maintained without change.

Thus, the connecting pipe can be provided and effectively functioned by simply fitting them without welding the connecting portion or tightening with the hose band. On the contrary, when disconnecting the communication pipe,
Since there is no fastening with a hose band, it can be performed simply by separating the curved pipe portion and the straight pipe portion.

Therefore, according to the present invention, it is possible to realize a pump device driven by an internal combustion engine, which is easily changed in both directions from a general-purpose product to an invention product and from an invention product to a general-purpose product.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION With respect to the pump device for driving an internal combustion engine of the present invention achieved by the first to third solving means as described above, modes for carrying out this will be described.

[First Embodiment] In the first embodiment of the present invention, in order to implement the above-mentioned solving means, the curved pipe portion has an annular shape having a diameter corresponding to the diameter of the straight pipe portion. The bottom recess is
It is characterized in that it is formed on the end face. Thus, by simply inserting the end of the straight pipe portion into the annular recess of the curved pipe portion and contacting the bottom of the recess, both can be fitted together and the movement beyond that state can be prevented.

[Second Embodiment] In the second embodiment of the present invention, in order to implement the above-mentioned solving means, the curved pipe portion is made of a solid material having a diameter corresponding to the diameter of the straight pipe portion. It is characterized in that it is composed of an inner curved pipe and a flexible outer curved pipe, all of which are fitted and inserted into the inner cavity. With this, by inserting the end of the straight pipe portion into the protruding portion of the outer curved pipe in the curved pipe portion and contacting the inner curved pipe end surface,
It is possible to fit both and prevent movement beyond that state. Moreover, since the inner curved pipe is solid, it is particularly difficult to crush.

[0033]

【Example】

[First Embodiment] The specific configuration of the first embodiment of the pump apparatus for driving an internal combustion engine according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a soil excavating device using the same, and FIG. 2 is an overall schematic diagram thereof. Also, FIG.
[Fig. 4] is an external view of a communication conduit, and Fig. 4 is a cross-sectional view of a connecting portion of the communication conduit.

This soil excavating device comprises a soil crushing unit 1
0, the soil suction unit 20, and the soil crushing unit 10 housed in the housing 100 via the flexible hose 43.
And a pump device (100) driven by an internal combustion engine that supplies a vacuum suction force to the soil suction unit 20 via a pipe 53. First, the soil crushing unit 10 and the soil suction unit 20 will be described, and then the pump device driven by the internal combustion engine will be described in detail.

The soil crushing unit 10 is a portion of the soil crusher excluding the compressed air supply portion, and introduces pressurized gas through the flexible hose 43 to crush the soil by using this as a motor drive source and a fumarolic source. It is a thing. For this reason, this unit 10 is connected to the handle portion 11 for gripping with a hand, a tubular body 12 extending downward from this, and an upper portion of the tubular body 12 to introduce pressurized gas into the inner cavity of the tubular body 12. The introduction pipe 13 and the cylindrical body 12 fixed to the tip of the cylindrical body 1
2 receives the pressure gas from the rotary shaft 15 as a driving source.
It is composed of an air motor 14 for rotating the motor and a rotary plate 16 fixed to the rotary shaft 15 at the center position and rotating. Then, as the rotary plate 16 rotates, the crushing blade 17 provided on the lower surface of the rotary plate 16 orbits, and the drain port of the air motor 14 rotates the rotary shaft 15 and the rotary plate 16 together.
The pressure gas is jetted below the rotary plate 16 through a through hole provided so as to reach.

The soil suction unit 20 is a soil vacuum excavator from which a vacuum suction force generation / transmission unit is removed.
A vacuum suction force is introduced through the conduit 53, and the soil is suctioned and transferred by this force. For this reason, this unit 20
Is a suction pipe 2 having a soil inlet 21 at the lower end.
2 and the inner sediment collection chamber 25a and further the filter chamber 25
b is composed of the soil collecting and dust collecting section 25 communicating with the upper end of the suction pipe 22 through the vacuum duct 23. Then, when vacuum suction is performed through the vacuum suction force introduction port 25c provided in the upper part of the filter chamber 25b, a high-speed air flow that entrains a part of the soil 70 is introduced from the suction port portion 21 into the suction pipe 22. After passing through the cavity and the vacuum duct 23 to reach the sediment collecting chamber 25a, the speed is reduced, and the filter chamber 25
In b, fine dust is also removed to form a clean air flow, but when decelerated in the earth and sand collecting chamber 25a, the earth and sand are left there to collect the sucked and transferred soil.

The pump device (100) driven by the internal combustion engine is
An engine 30 as an internal combustion engine, a compressor 60 as a pump driven by the internal combustion engine, a high-pressure side pipe 41 connected to add exhaust gas of the engine 30 to the exhaust gas of the compressor 60 and supply it to the soil crushing unit 10,
42, 43, intake air of the compressor 60 and engine 30
Negative pressure side pipes 51, 52, 53 for supplying the vacuum suction force by the suction of the air to the soil suction unit 20 and the pipes for connecting the suction air of the engine 30 to the suction air of the compressor 60 to enhance the vacuum suction force. It is composed of communication conduits 101, 102 and 103 that are inserted and connected between 51 and 52.

The engine 30 operates to generate a rotational force, and the rotational force is driven by the rotational force to generate a compressor 60.
The output shaft is connected to the drive shaft of the compressor 60 via a coupling for this purpose. Further, the engine 30 is preferably a diesel engine that is relatively resistant to pressure fluctuations of intake air and exhaust gas, and is accompanied by intake air and exhaust gas for internal combustion during operation.

The compressor 60 is preferably a reciprocating type compressor, a screw type compressor or the like in order to generate a vacuum suction force by intake air and high pressure air by exhalation air. In order to bring out the crushing ability of the crushing unit 10 sufficiently, it is 5 to 7 kgf / cm ² (about 0.
This is because the pressure of about 5 to 0.7 MPa) is desired, but the discharge pressure of these types of compressors reaches that pressure or higher. Of course, even if the discharge pressure is lower than that, it can be driven accordingly, so long as it can suck air, compress the intake air, and discharge the compressed air, other types of compressors can be used. Alternatively, it may be a blower.

The pipes 41, 42 and 43 are provided with the compressor 6
In addition to the compressed air from 0, the exhaust gas from the engine 30 is also sent to the soil crushing unit 10 as a pressure gas. Therefore, these pipelines have a pipeline 41 having one end connected to the tip of the muffler 32 of the engine 30, that is, an exhaust port, a pipeline 42 having one end connected to the discharge port of the compressor 60, and a pipeline 42 having one end. And a flexible hose 43 connected to the other end of the. Then, the other end of the conduit 41 is extended and connected to the conduit 42,
Further, the other end of the flexible hose 43 is connected to the introduction pipe 13 of the soil crushing unit 10, and the exhaust gas of the compressor 60 as well as the exhaust gas of the engine 30 is discharged from the soil crushing unit 1.
It is supplied to 0. Note that a variable throttle valve is inserted in the atmosphere release portion of the pipeline 41, and the exhaust pressure of the engine 30 can be reduced by bypassing the flow rate according to the throttle amount from the pipeline 41 to the atmosphere. It is adjustable so as not to significantly affect the operation. This value is usually 4 to 7 for a diesel engine, for example.
It is about kgf / cm ² (about 0.4 to 0.7 MPa).

The pipelines 51, 52, 53 are the compressor 6
In addition to the intake air of 0, the intake air of the engine 30 is also circulated from the soil suction unit 20 as a source of the vacuum suction force. Therefore, these pipelines include a pipeline 51 (intake pipeline of the internal combustion engine) whose one end is connected to the tip of the air cleaner 31 in the engine 30, that is, the intake port.
Pipe line 52 whose one end is connected to the intake port of the compressor 60
(Pump suction pipe line) and a pipe line 53 (vacuum suction force supply pipe line), one end of which is connected to the vacuum suction force introducing port 25c of the soil dust collecting section 25. And the pipelines 51, 5
The other ends of the reference numerals 2, 53 are connected to each other via the extension path and the communication conduits 101, 102, 103 described below. As a result, the intake air of the engine 30 is compressed by the compressor 6
While communicating with the intake air of 0, the vacuum suction force that merges these intake air is collected dust collecting section 25 and vacuum duct 23.
After that, it is introduced into the soil suction unit 20.

In the communication pipes 101, 102, 103, a rubber pipe 101 as a curved pipe portion, a plastic pipe 102 as a straight pipe portion, and a rubber pipe 103 as a curved pipe portion are provided inside the housing 100. While being sewn and bent in the gap of 30, the compressor 60 or its accessories, they are sequentially connected in series (see FIG. 2).

The plastic pipe 102 is made of plastic containing no wire or the like, is cut into a proper length, and is a non-metal solid straight pipe (see FIG. 3). Each of the rubber tubes 101 and 103 is a bent hose made by mantle-molding rubber containing no wire or the like, and all are flexible non-metallic bent tubes (see FIG. 3). .

An annular groove is formed on the end surface of the rubber tube 101 to form a bottomed recess 101a. Recess 10
The diameter of 1a corresponds to the diameter of the plastic pipe 102,
The groove width corresponds to the thickness of the plastic tube 102. Thus, by inserting the end of the plastic tube 102 into the recess 101a of the rubber tube 101, the rubber tube 101
The end of the rubber tube 101 is closely fitted to the end of the. In addition, the end surface of the plastic tube 102 is attached to the rubber tube 1
When it is brought into contact with the bottom of the recessed portion 101a of No. 01, further movement is prevented. The rubber tube 103 is also the same.

Although illustration and detailed description are omitted, in order to realize stable operation of the engine 30 and the like with a simple mechanism, the communication pipes 101, 102 and 103 are provided with the engine 30.
It is also desirable to provide a check valve for blocking the flow from the side to the compressor 60 side and a pressure control valve for introducing the outside air to keep the intake pressure of the engine 30 at or above the minimum intake pressure.

The operation of the apparatus of this embodiment having such a structure will be described.

This soil excavating device comes into play when the asphalt or the like above the soil 70 is discharged by a power shovel or the like and the soil 70 covering the buried pipe 80 is exposed. Therefore, after evacuating the power shovel or the like, the soil excavation device is carried to the excavation site by a truck or the like (not shown), and the pump device (100) driven by the internal combustion engine is installed near the excavation hole.

At this time, when the rubber pipe 101, the plastic pipe 102, and the rubber pipe 103 are not attached, first, the extension pipes are connected to the pipe lines 51 and 52, and the end of the extension pipe line of the pipe line 51 is connected. The part is inserted into the recess at one end of the rubber tube 101.
Further, one end of the plastic pipe 102 is inserted into the other end recess 101a of the rubber pipe 101, the other end of the plastic pipe 102 is inserted into one end recess of the rubber pipe 103, and finally the conduit 52 is extended to the other end recess of the rubber pipe 103. Insert the end of the pipeline. This is performed by sewing a gap in the housing 100. Since the rubber tubes 101 and 103 have flexibility,
Deformation at the time of insertion work and dimensional error such as pipe length do not suffer. In this way, the preparation for adding the intake air of the engine 30 to the intake air of the compressor 60 is quickly completed.

Next, in order to perform soil excavation work, that is, to perform soil crushing and soil suction in parallel, one worker holds the handle portion 11 of the soil crushing unit 10 and uses the crushing blade 17 thereof. To the soil 70, the other worker holds the suction pipe 22 of the soil suction unit 20 and turns the soil suction port portion 21 toward the soil 70.

When the engine 30 is started to operate the compressor 60, compressed air is discharged from the compressor 60 and exhaust gas is discharged from the engine 30. Then, the crushing blade 17 of the soil crushing unit 10 makes a circular motion by using the compressed air and the exhaust as driving sources, and the compressed air and the exhaust are also used as the fumarolic sources toward the soil below the crushing blade 17 to blow the fumes. Is done. Therefore, when one worker manipulates the handle portion 11 to bring the crushing blade 17 into contact with the soil 70, the lump of soil in that portion is rapidly dried by the jet of gas containing high-temperature exhaust gas, and at the same time, the crushing blade. It is mechanically crushed by 17, or mechanically crushed by a crushing blade 17, and at the same time, it is atomized and blown off by injection of exhaust gas,
The soil is crushed efficiently. Thus, not only the compressed air from the compressor 60 but also the exhaust gas of the engine 30 is used as the drive source and the fumarolic source, so that the flow rate of the pressure gas is higher than in the conventional case, and the work efficiency of soil crushing is improved. .

During operation of the engine 30 and the like, air is taken in by the compressor 60 and the engine 30
But intake is done. Then, part of the air taken in via the pipe 53 is taken into the compressor 60 via the pipe 52, while the rest is taken into the engine 30 via the pipe 51. Then, a vacuum suction force is introduced into the soil suction unit 20 by using these suction air as a source, and the outside air is sucked from the soil suction port portion 21. Therefore, when the other worker manipulates the suction pipe 22 of the soil suction unit 20 to bring the soil suction port portion 21 close to the soil crushed by the soil crushing unit 10, the soil is sucked and transferred by the soil suction unit 20. It is collected and collected in the sediment collection chamber 25a one after another. Since not only the intake air of the compressor 60 but also the intake air of the engine 30 is used as the source of the vacuum suction force in this way, the vacuum suction force is higher than in the past, and the work efficiency of soil suction transfer is improved.

In this way, a sufficient vacuum suction force is constantly supplied to the soil suction unit 20. Therefore, by appropriately moving the soil crushing unit 10 and the soil suction unit 20 and further digging the soil 70 that appears from below after crushing / suctioning, the presence of the buried pipe 80 can be confirmed in due time. Further, the surroundings of the buried pipe 80 may be dug down. As a result, the buried pipe 80 can be exposed without being damaged, and the function of the soil excavating device is completed.

Finally, after stopping the engine 30, the engine 30, the units 20, 30 and the like are mounted on a truck or the like and removed from the excavation site. This completes all the work performed by the soil excavator using the pump device driven by the internal combustion engine. When it is desired to return the pump device (100) driven by the internal combustion engine to the original state, the rubber pipe 101 and the rubber pipe 103 may be pulled out, and then the ends of the pipe lines 51, 52 or their extended road ends may be plugged. . With just this, it is easily restored.

[Second Embodiment] With respect to the second embodiment of the pump device for driving the internal combustion engine of the present invention, another example of the construction of the communication conduit which is the characteristic part of the pump device will be described. FIG. 5 is a structural diagram thereof, and FIG. 6 is an explanatory diagram of how to assemble it.

The plastic tube 102 is the same as that described above. On the other hand, the curved pipe portion corresponding to the rubber pipe 101 has an inner curved pipe 1 of the same material and the same diameter as the plastic pipe 102.
01b, the inner diameter of the plastic pipe 102 and the inner curved pipe 1
The inner curved pipe 101b has a length slightly smaller than the outer diameter of 01b.
The outer curved pipe 101c is longer than that. Outer curved pipe 10
1c is made of a relatively soft rubber, has flexibility, and the inner curved pipe 101b is pushed into the center,
All of the inner curved tubes 101b are closely fitted and inserted into the inner cavity. Similarly, the curved tube portion corresponding to the rubber tube 103
It is composed of an inner curved pipe 103b made of plastic and an outer curved pipe 103c made of rubber (see FIG. 5). As a result, the curved pipe portion is a non-metallic curved pipe having flexibility at least at its end portion.

To connect the curved pipe portion and the straight pipe portion as described above, the jig 104 or the like divided into the following two parts is used (see FIG. 6). The jig 104 has a slightly thin tip so that it can be inserted into the outer curved pipe 101c, has a thick rear end and is formed with a pulling handle, and has a tapered inner cavity and a plastic end portion. The tube 102 can be inserted. The tip of the jig 104 is inserted into the outer curved pipe 101c, and the plastic pipe 102 is further inserted into the inner cavity from the rear end of the jig 104, and the plastic pipe 102 is inserted into the outer curved pipe 1c.
Push in until it touches 01c. Then, the jig 104 is pulled out. With this alone, the end portion of the curved pipe portion and the end portion of the straight pipe portion can be closely fitted easily without being fastened with a hose band or the like. Further, even if the plastic pipe 102 whose end face is in contact with the end face of the outer curved pipe 101c cannot be moved further even if it is pulled in by a vacuum suction force, the connection does not come off.

[0057]

As is apparent from the above description, in the pump device driven by the internal combustion engine according to the first solution of the present invention, the communication conduit is housed in the same housing as the internal combustion engine and the like. As a result, there is an advantageous effect that it is possible to realize an internal combustion engine-driven pump device having a configuration in which the communication conduit does not impair the transportation and workability even if the communication conduit is added.

Further, in the pump device for driving the internal combustion engine according to the second solving means of the present invention, the communication pipe is prevented from being crushed even if there is no wire or the like, so that the communication pipe is provided in the housing. This has an advantageous effect that a general-purpose product can be easily modified when the path is provided.

Further, in the pump device driven by the internal combustion engine according to the third means of solving the problems of the present invention, by adopting a structure which does not require fastening of the communication conduit with a hose band, general-purpose products can be invented. There is an advantageous effect that bidirectional modification such as modification to a product and modification from an invention product to a general-purpose product is facilitated.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a soil excavator using the pump device driven by an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is an overall schematic diagram thereof.

FIG. 3 is an external view of the communication conduit.

FIG. 4 is a sectional view of a connecting portion of the communication conduit.

FIG. 5 is an example of another communication conduit.

FIG. 6 is an explanatory view of the assembling method.

[Explanation of symbols]

 10 Soil Crushing Unit 20 Soil Suction Unit 30 Engine (Motor; Internal Combustion Engine) 31 Air Cleaner (Intake Port) 32 Muffler (Exhaust Port) 41 High Pressure Side Pipeline 42 High Pressure Side Pipeline 43 Flexible Hose Pipeline 51 Negative Pressure Side Pipeline (intake line of internal combustion engine) 52 Negative pressure side line (pump intake line) 53 Negative pressure side line (vacuum suction power supply line) 60 Compressor (compression blower; pump) 70 Soil 80 Buried pipe 100 Housing 101 Rubber Pipe (Flexible Curved Pipe; Communication Pipeline) 102 Plastic Pipe (Non-Metal Direct Pipe; Communication Pipeline) 103 Rubber Pipe (Flexible Curved Pipe; Communication Pipeline) 101b Inner Curved Pipe 101c Outside Curved tube 103b Inner curved tube 103c Outer curved tube 104 Connection jig

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Nagata 3-18-3 Daiwa City, Kanagawa Prefectural Government, Hakko Technology Development Center Co., Ltd. (72) Inventor Koichi Moriya 3-18-3 Daiwa City, Kanagawa Prefecture Hakko Technology Development Center Co., Ltd.

Claims (3)

[Claims] 1. A pump device for driving an internal combustion engine, comprising: an internal combustion engine; a pump driven by the internal combustion engine; and a housing for housing the internal combustion engine and the pump, and generating a vacuum suction force by intake air of the pump. An internal combustion engine is provided, which is provided with a communication pipeline that communicates an intake pipeline of the internal combustion engine with an intake pipeline of the pump, and the communication pipeline is disposed inside the housing. Engine driven pump device. 2. The communication conduit includes a non-metallic curved pipe portion having flexibility at all or at least an end portion, and a non-metal solid straight pipe portion connected to the curved pipe portion. The pump device driven by an internal combustion engine according to claim 1. 3. The communication conduit includes a curved pipe part having flexibility at all or at least an end, and a solid straight pipe part having an end fitted to the end thereof. 2. The pump device for driving an internal combustion engine according to claim 1, wherein the curved pipe portion has means for abutting the fitting side end surface of the straight pipe portion to prevent movement.