JP3752325B2 - Pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump device, and more particularly, an intake air control in a structure that increases a vacuum suction force using an internal combustion engine, a compressor driven by the internal combustion engine, and an ejector that generates a vacuum suction force by exhalation from the compressor. About.
[0002]
[Prior art]
The pump device has various uses, and one of them is a lining operation in an underground underground pipe and a soil excavation work on the ground.
The lining operation in the pipe of the buried pipe is an operation for forming a coating film on the inner surface of the pipe. As an example, a positive pressure or a negative pressure is supplied from one end in the extension direction of the pipe, and one end from the other end in the extension direction. In this method, an air flow in the pipe toward the pipe is generated, and the coating nozzle of the pig for lining coating introduced and pulled in the pipe is rotated by the air flow in the pipe to centrifugally apply the lining resin liquid. In some cases, the pipe cleaning pig or the parachute is moved in the pipe by using the generation of the air flow in the pipe.
[0003]
The soil excavation work on the ground is provided with a crusher having a crushing blade driven by an air motor at the tip of a handle that can be gripped by an operator, and the crushing blade is rotated by compressed air while crushing the soil. It is intended to suck and remove the soil with a vacuum hose connected to a vacuum suction device.
The crusher and the vacuum suction device used for soil excavation work are often used at the same time. For this reason, the generation of compressed air by the compressor and the vacuum suction force are utilized. The vacuum suction force described above is used when generating the air flow in the pipe when the lining coating pig used for the lining operation in the pipe is moved to rotate the coating nozzle.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional pump apparatus as described above, it is desirable to increase the output of the compressor and the internal combustion engine that is the drive source thereof, in order to improve pump efficiency. However, if the internal combustion engine and the compressor are large-sized, The cost will increase accordingly.
Therefore, it has been proposed to use an intake operation in an internal combustion engine or a compressor in order to increase the vacuum suction force of the vacuum suction device (for example, Japanese Patent Application No. 7-82410 related to the prior application of the present applicant).
However, when the intake air of the internal combustion engine or the compressor is used for increasing the vacuum suction force, there are the following problems.
Suction pressure in the vacuum suction device when the vacuum suction force is increased when an engine that is an internal combustion engine instead of a motor is used as a compressor drive source due to restrictions on received power and the rotation speed is constant. As the value increases, the amount of intake air in the engine and compressor decreases. For this reason, the minimum intake amount for maintaining normal combustion of the engine and for maintaining normal compression operation in the compressor cannot be obtained.
[0005]
An object of the present invention is to provide a vacuum suction force while ensuring a predetermined operation state in an internal combustion engine and a compressor when intake air of the compressor or the internal combustion engine is used for increasing the vacuum suction force in view of the problems in the conventional pump device. An object of the present invention is to provide a pump device capable of increasing the number of the pumps.
[0006]
In order to achieve this object, an invention according to claim 1 is a pump comprising an internal combustion engine, a compressor driven by the internal combustion engine, and an ejector for generating a vacuum suction force using the air discharged from the compressor as an ejection source. An internal combustion engine sub-communicator capable of communicating between an intake portion of the internal combustion engine, an intake portion of the compressor, and an intake portion of the ejector, and an intake portion of the internal combustion engine and the atmosphere. A compressor, a compressor sub-communication passage capable of communicating with the air intake part of the compressor and the atmosphere, an internal combustion engine sub-communication passage, and an internal combustion engine opening / closing means and a compressor disposed in the compressor sub-communication passage, respectively. A first opening / closing mechanism disposed in the main communication path and configured to control communication between the intake portion of the ejector and the intake portion of the internal combustion engine; And an opening / closing means for the internal combustion engine and an opening / closing for the compressor, wherein the opening / closing means for the internal combustion engine and the opening / closing for the compressor are disposed in the main communication path and control communication between the intake portion of the ejector and the intake portion of the compressor. The means is set to a state in which air is introduced into the engine and the compressor when the intake pressure corresponding to the suction pressure generated by the ejector reaches a minimum intake amount required for the engine and the compressor. It is said.
[0007]
According to a second aspect of the present invention, in the pump device according to the first aspect, the opening / closing means for the internal combustion engine, the opening / closing means for the compressor, and the first and second opening / closing control means correspond to the suction pressure generated by the ejector. It is characterized by being opened and closed.
[0008]
According to a third aspect of the present invention, in the pump device according to the first or second aspect, when the suction pressure generated by the ejector is at the upper limit (at the minimum vacuum pressure), only the first and second opening / closing control means are provided. It is characterized by being opened.
[0009]
According to a fourth aspect of the present invention, in the pump device according to the first or second aspect, the opening / closing means for the internal combustion engine and the opening / closing means for the compressor when the suction pressure generated in the ejector is at the lower limit (at the time of the maximum vacuum pressure). It is characterized by only being opened.
[0010]
According to a fifth aspect of the present invention, in the pump device according to the first or second aspect, when the suction pressure generated in the ejector is between an upper limit and a lower limit, the opening / closing means for the internal combustion engine and the second Only the opening / closing control means is opened.
[0011]
According to a sixth aspect of the present invention, in the pump device according to any one of the first to fifth aspects, the internal combustion engine opening / closing means, the compressor opening / closing means, and the first and second opening / closing control means have a predetermined pressure. It is characterized by comprising a check valve that can be opened and closed with.
[0012]
[Action]
In the first, second, and sixth aspects of the invention, since the intake path to the internal combustion engine and the compressor is switched according to the suction pressure obtained by the vacuum suction force generated by the ejector, the minimum intake air amount in the internal combustion engine and the compressor is reduced. It is ensured and it is possible to prevent the operation state from being deteriorated due to insufficient intake.
[0013]
According to the third aspect of the present invention, when the intake air amount to the internal combustion engine and the compressor is secured so as not to deteriorate the operation state of each of these devices, the vacuum suction force of the ejector using the intake air of the normal internal combustion engine and compressor is used. Can be increased.
[0014]
According to the fourth and fifth aspects of the present invention, when the intake air amount to the internal combustion engine and the compressor is not optimized by the vacuum suction force of the ejector, the communication with the suction portion of the ejector is interrupted and the internal combustion engine and the compressor are Thus, the intake state is directly taken from the atmosphere, so that the operating state of the internal combustion engine and the compressor can be optimized.
[0015]
【Example】
The details of the present invention will be described below with reference to the illustrated embodiments.
FIG. 1 is a schematic diagram showing a configuration of a main part of a pump device according to an embodiment of the present invention. In FIG. 1, an intake system in the pump device is shown.
In FIG. 1, a pump device 1 includes an engine 2 and a compressor 3 as an internal combustion engine provided in a soundproof housing 1A, and further includes an externally attached ejector 4 on the outer wall of the soundproof housing 1A.
The engine 2 is provided for rotationally driving the compressor 3, and is coupled to the compressor 3 by a coupling provided on the output shaft.
As the engine 2, a diesel engine that is relatively resistant to intake and exhaust pressure fluctuations is used.
The compressor 3 employs a reciprocating type and a screw type in order to generate a vacuum suction force by the intake air and to generate a high-pressure air by the exhalation, and to supply to the ejector 4 which will be described later and to a work machine using the high-pressure air Supply the working pressure gas.
As a working machine using high-pressure air, there is an air motor for rotating a crushing blade for soil excavation described in the prior art.
Although details of the ejector 4 are not shown, for example, as shown in the specification of Japanese Patent Application No. 8-127502, which is a prior application of the applicant of the present application, a vacuum is generated by the high-pressure air injection nozzle and the high-pressure air. A combination with a diffuser that generates a suction force is used. The vacuum suction force generated by the ejector 4 is used, for example, in the crushed soil suction device used in the above-described soil excavation work, or in the pipe due to the generation of positive / negative pressure in the pipe described in the prior art. Used to generate airflow.
[0016]
The air sucked from the outside by the vacuum suction force generated by the ejector 4 is introduced into the intake portions of the engine 2 and the compressor 3 through the main communication passage 5 described later.
The main communication path 5 is connected to and communicates with an air cleaner 6 located at the intake portion of the engine 2 and an air cleaner 7 located at the intake portion of the compressor 3. The ejector 4 utilizes intake air in the engine 2 and the compressor 3. The vacuum suction force can be increased.
[0017]
In the main communication path 5, first and second opening / closing control means 8 and 9 for controlling the opening and closing of the communication path are arranged.
Each of the first and second opening / closing control means 8 and 9 is composed of a check valve whose opening / closing amount is controlled according to the suction pressure obtained by the vacuum suction force generated by the ejector 4. The opening / closing control means 8 is disposed between the ejector 4 and the air cleaner 7 on the compressor 3 side, and the second opening / closing control means 9 is disposed closer to the air cleaner 6 on the engine 2 side than the first opening / closing means 8. Has been.
[0018]
In addition to the main communication passage 5, an internal combustion engine sub-communication passage 10 and a compressor sub-communication passage 11 are connected to the intake passage on the engine 2 side and the intake passage on the compressor 3 side.
The internal combustion engine sub-communication passage 10 and the compressor sub-communication passage 11 are respectively provided with an internal combustion engine opening / closing means 12 and a compressor opening / closing means 13 for controlling the communication state with the atmosphere. The means 12 and 13 are constituted by check valves whose opening / closing amounts are controlled in accordance with the suction pressure of air from the ejector 4 introduced into the main communication passage 5.
[0019]
FIG. 2 is a circuit diagram for explaining the configuration of the intake system including the above-described open / close control means 8 and 9, the internal combustion engine open / close means 12 and the compressor open / close means 13. In FIG. The two opening / closing control means 8 and 9 are normally kept open, and the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 are kept normally closed. In FIG. 2, reference numeral (1) means that exhaust and exhaust from the engine 2 and the compressor 3 are supplied to the ejector 4.
[0020]
Each of the above open / close control means 8, 9 and the internal combustion engine open / close means 12 and the compressor open / close means 13 are controlled to open / close based on the conditions shown in FIG.
FIG. 3 is a diagram showing the results of an experiment on the relationship between the suction pressure and the intake air amount according to the vacuum suction force generated by the ejector 4, in which the result indicated by the symbol A indicates the suction pressure by the ejector 4 alone. And the result indicated by the symbol B shows the relationship between the suction pressure and the intake amount when the vacuum suction force is increased by the intake air of the compressor 3 in addition to the ejector 4. Further, the result indicated by reference sign C indicates the relationship between the suction pressure and the intake air amount when the vacuum suction force is increased by the intake air of the engine 2 in addition to the result indicated by reference sign B.
As apparent from FIG. 3, the intake air amount tends to decrease as the suction pressure increases. In particular, when the vacuum suction force of the ejector 4 is increased by using the intake air of the compressor 3, the intake air amount decreases when the intake pressure reaches a certain suction pressure in the ejector 4, and the intake air when only the ejector 4 is used. Since the compressor 3 is used, the effect of increasing the suction force cannot be obtained. Therefore, not only the vacuum suction force by the ejector 4 but also the intake air of the other device is used to increase the suction pressure of the other device, and accordingly, the intake air amount in the other device decreases. Therefore, it is necessary to secure an increase in the suction pressure due to the vacuum suction force in the ejector 4 by securing an intake air amount for other devices.
In the present embodiment, as the suction pressure due to the vacuum suction force generated in the ejector 4 increases, the communication state between the ejector 4 and the intake portions of the engine 2 and the compressor 3 is changed to the first and second opening / closing control means 8, 9 and Control is performed by switching the operation of the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 so that the minimum intake air amount of the engine 2 and the compressor 3 is maintained and the operating state of the engine 2 and the compressor 3 is not deteriorated. . As a result, the intake air of the engine 2 and the compressor 3 contributes to an increase in the vacuum suction force of the ejector 4, and the exhaust and exhaust air of the engine 2 and the compressor 3 are used for supplying high-pressure air to the ejector 4. The vacuum suction force can be further increased to obtain an increase in suction pressure.
[0021]
That is, the open / close control of each open / close control means 8, 9, internal combustion engine open / close means 12, and compressor open / close means 13 is executed in the following mode according to the suction pressure generated in the ejector 4.
(1) When the upper limit (minimum vacuum pressure) of the suction pressure generated in the ejector 4 is reached, only the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 are opened, and the engine 2 and the compressor 3 are opened. Allow direct introduction of air. As a result, the intake air amount to the engine 2 and the compressor 3 is prevented from being insufficient, the drive of the compressor 3 by the engine 2 is maintained in a normal state, and the discharge of high-pressure air from the compressor 3 is also maintained normally. Therefore, it can be maintained that the vacuum suction force of the ejector 4 is increased by these devices.
[0022]
(2) When the lower limit value (maximum vacuum pressure) of the suction pressure generated in the ejector 4 is reached, only the first and second opening / closing control means 8 and 9 are opened, and the intake air from the ejector 4 is sent to the engine 2 And introduced into the intake portion of the compressor 3. Thus, when the intake air amount does not adversely affect the combustion state of the engine 2 and the compression operation of the compressor 3, the air sucked by the vacuum suction force generated by the ejector 4 is in a normal state. Therefore, the intake air of the engine 2 and the compressor 3 is added, and the vacuum suction force of the ejector 4 is increased.
[0023]
(3) When the suction pressure generated in the ejector 4 is between the upper limit value and the lower limit value, the first opening / closing control means 8 and the internal combustion engine opening / closing means 12 are opened so that the intake air from the ejector 4 is sucked. While being introduced into the compressor 3, the atmosphere is directly introduced into the engine 2. As a result, the operation of the engine 2 is maintained normally, whereby the drive of the compressor 3 is normalized, so that the vacuum suction force at the ejector 4 is increased by the intake air of the compressor 3 in addition to the intake air of the ejector 4.
Further, when the operations of the engine 2 and the compressor 3 are maintained in a normal state, the exhaust pressure from the engine 2 and the exhaust air from the compressor 3 are used as the high-pressure air of the ejector 4 so that the suction pressure generated in the ejector 4 is obtained. As a result, the changes in the intake air amount of the engine 2 and the compressor 3 are corrected, and the vacuum suction force in the ejector 4 is further increased.
[0024]
Since the present embodiment is configured as described above, when the engine 2 is started to operate the compressor 3, compressed air is discharged from the compressor 3 and exhaust gas is also discharged from the engine 2. Then, high-pressure air using these compressed air and exhaust as drive sources is introduced into the ejector 4, and a vacuum suction force is generated in the ejector 4. Thus, the vacuum suction force in the ejector 4 can be increased by using not only the compressed air from the compressor 3 but also the exhaust of the engine 2 as a drive source and an air source, so that the working efficiency in the apparatus using high-pressure air is increased. Can be improved.
[0025]
Further, when the engine 2 is operating, when the suction pressure generated in the ejector 4 corresponds to the lower limit value, only the first and second opening / closing control means 8 and 9 are opened. As a result, air is sucked in by the compressor 3 and air is also sucked in by the engine 2. Then, a part of the air sucked into the ejector 4 by the vacuum suction force generated in the ejector 4 is sucked into the compressor 3 connected to the main communication path 5, and the rest is sent to the engine 2. Inhaled. As described above, by using the intake air in the engine 2 and the compressor 3 in addition to the vacuum suction force generated in the ejector 4, the vacuum suction force in the ejector 4 is increased and is necessary for the operation of the engine 2 and the compressor 3. Since the intake air amount can be obtained, the vacuum suction force of the ejector 4 is further increased by utilizing the exhaust and exhaust air from the engine 2 and the compressor 3.
[0026]
When the suction pressure generated in the ejector 4 reaches the upper limit value, that is, when the suction pressure due to the intake air of the engine 2 and the compressor 3 reaches the set value equal to or higher than the suction pressure of the ejector 4 in addition to the original suction pressure of the ejector 4. Only the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 are opened. As a result, even if the amount of air sucked from the ejector 4 is reduced, the air is directly sucked into the engine 2 and the compressor 3, so that the minimum intake amount in the engine 2 and the compressor 3 is guaranteed. The operating state is maintained normally. Therefore, the compressor 3 driven by the engine 2 enables the supply of high-pressure air to increase the vacuum suction force of the ejector 4.
[0027]
On the other hand, when the suction pressure generated in the ejector 4 is between the upper limit value and the lower limit value, only the first opening / closing control means 8 and the internal combustion engine opening / closing means 12 are opened. Thereby, a part of the air sucked into the ejector 4 is sucked only by the compressor 3, and the atmosphere is sucked into the engine 2 regardless of the air sucked into the main communication passage 5. Therefore, since the amount of air sucked into the main communication passage 5 decreases due to the increase of the suction pressure and the minimum intake amount for the engine 2 cannot be maintained, the operation in the engine 2 is maintained. 3 is maintained, and the vacuum suction force by the ejector 4 can be increased.
[0028]
According to the embodiment as described above, it is possible to increase the vacuum suction force of the ejector 4 by using the suction of the engine 2 and the compressor 3 in addition to the original suction pressure of the ejector 4, so that the suction pressure is temporarily increased. If an unexpected situation occurs, if only the first and second opening / closing control means 8 and 9 are opened, the suction pressure can be changed to the desired pressure by switching to the suction operation by the normal ejector 4. it can.
[0029]
Further, according to the present embodiment, the ejector 4 that generates the vacuum suction force is used, and the vacuum suction force can be increased by using the intake air from the engine 2 and the compressor 3 in addition to the vacuum suction force at the ejector 4. Therefore, the compressor 3 can be downsized as compared with the case where the suction force is obtained only by the compressor 3.
[0030]
【The invention's effect】
As described above, according to the first, second, and sixth aspects of the invention, the intake path to the internal combustion engine and the compressor is switched according to the suction pressure obtained by the vacuum suction force generated by the ejector. In addition, the minimum intake amount in the compressor is ensured, and it becomes possible to increase the suction pressure by preventing the deterioration of the operation state due to insufficient intake.
[0031]
According to the third aspect of the present invention, when the intake air amount to the internal combustion engine and the compressor is secured so as not to deteriorate the operating state of each of these devices, the intake air of the normal internal combustion engine and the compressor is used to vacuum the ejector. The suction force can be increased.
[0032]
According to the fourth and fifth aspects of the present invention, when the intake air amount to the internal combustion engine and the compressor is not optimized by the vacuum suction force of the ejector, the communication with the suction portion of the ejector is blocked and the internal combustion engine and the compressor On the other hand, since the intake state is directly taken from the atmosphere, the operating state of the internal combustion engine and the compressor can be made appropriate, so that the intake air of the compressor driven by the internal combustion engine can be used to increase the vacuum suction force of the ejector.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining a main configuration of a pump device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram for explaining an intake system used in the pump device shown in FIG. 1;
FIG. 3 is a diagram for explaining the relationship between the suction pressure and the intake air amount in the pump device shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump apparatus 1A Soundproof housing 2 Engine as an internal combustion engine 3 Compressor 4 Ejector 5 Main communication path 8 First opening / closing control means 9 Second opening / closing control means 10 Internal combustion engine required auxiliary communication path 11 Compressor auxiliary communication path 12 Internal combustion engine Open / close means 13 Compressor open / close means

Claims (6)

A pump device comprising an internal combustion engine, a compressor driven by the internal combustion engine, and an ejector that generates a vacuum suction force using the exhaled air from the compressor as an ejection source,
A main communication passage communicating the intake portion of the internal combustion engine, the intake portion of the compressor, and the intake portion of the ejector;
A sub-communication passage for an internal combustion engine capable of communicating the intake portion of the internal combustion engine and the atmosphere;
A compressor sub-communication passage capable of communicating between the compressor intake and the atmosphere;
An internal combustion engine opening / closing means and a compressor opening / closing means respectively disposed in the internal combustion engine sub-communication passage and the compressor sub-communication passage;
A first opening / closing control means arranged in the main communication path for controlling communication between the intake portion of the ejector and the intake portion of the internal combustion engine;
A second opening / closing means that is disposed in the main communication path and controls communication between the intake portion of the ejector and the intake portion of the compressor;
The opening / closing means for the internal combustion engine and the opening / closing means for the compressor introduce air into the engine and the compressor when the intake pressure corresponding to the suction pressure generated by the ejector is less than the minimum intake amount required for the engine and the compressor. A pump device characterized by being set to a position to perform. The pump device according to claim 1, wherein
The pump device according to claim 1, wherein the opening / closing means for the internal combustion engine, the opening / closing means for the compressor, and the first and second opening / closing control means are opened / closed according to a suction pressure generated by the ejector. The pump device according to claim 1 or 2,
A pump device characterized in that only the first and second opening / closing control means are opened when the suction pressure generated in the ejector is at the upper limit (at the time of the minimum vacuum pressure). The pump device according to claim 1 or 2,
Pump means characterized in that only the opening / closing means for the internal combustion engine and the opening / closing means for the compressor are opened when the suction pressure generated in the ejector is at the lower limit (at the maximum vacuum pressure). The pump device according to claim 1 or 2,
The pump device according to claim 1, wherein when the suction pressure generated in the ejector is between an upper limit and a lower limit, only the opening / closing means for the internal combustion engine and the second opening / closing control means are opened. The pump device according to one of claims 1 to 5,
The pump device according to claim 1, wherein the opening / closing means for the internal combustion engine, the opening / closing means for the compressor, and the first and second opening / closing control means are constituted by check valves that can be opened / closed at a predetermined pressure.

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