JP3961624B2 - 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 operation on the ground.
The lining operation in the buried pipe is an operation for forming a coating film on the inner surface of the pipe. For example, by applying positive or negative pressure from one end in the extension direction of the pipe, the other end from the other end in the extension direction is applied. The air flow in the pipe is generated, and the coating nozzle of the lining coating pig 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 performed by using a crusher having a crushing blade rotated by an air motor at the tip of a handle that can be gripped by an operator, and crushing the soil while rotating this crushing blade with compressed air. 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 drive source of the compressor, and the rotation speed is constant. Will increase. However, along with this, the intake air amount in the engine and the compressor shows a decreasing trend. 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]
Thus, it is conceivable to introduce the atmosphere by opening the intake portions of the engine and the compressor only when the intake air amount of the engine and the compressor is decreased. As a configuration used to execute such a system, a configuration is provided in which an on-off valve that sets the intake portion in two modes of opening or closing is uniquely provided, and the on-off valve is opened in response to a decrease in the intake air amount. There is.
However, if you try to open the open / close valve independently when the intake air amount in the engine or compressor decreases, chattering is likely to occur when switching the open / close valve due to intake air pulsation that occurs in the engine or compressor. This can lead to inadequate atmospheric uptake.
[0006]
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. In particular, the present invention provides a pump device having a configuration capable of optimizing an air supply state for maintaining a predetermined operation in an internal combustion engine or a compressor. There is.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the invention described in claim 1 includes 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. In the pump device configured to take in the intake air from the engine and the compressor into the internal combustion engine and the compressor, while taking in the air directly from the ejector side, the internal combustion engine and the compressor are connected to the internal combustion engine and the compressor. The internal combustion engine opening / closing means and the compressor opening / closing means are provided on the air intake side of the engine, and the internal combustion engine opening / closing means and the compressor opening / closing means are slidable by detecting the negative pressure generated in the ejector. An intake portion of the internal combustion engine and the compressor connected to the piston A valve body for changing the opening / closing amount in the intake portion of the engine, and changing the opening / closing amount following the change in the intake amount in the internal combustion engine and the compressor according to the suction pressure generated by the ejector. The intake air amount in the internal combustion engine and the compressor is configured to prevent the intake air amount from becoming a minimum intake air amount or less.
[0008]
According to a second aspect of the present invention, in the pump device according to the first aspect, the valve body provided in the opening / closing means for the internal combustion engine and the compressor always closes the intake portions of the internal combustion engine and the compressor. It is characterized by having a habit and changing the intake portion to increase in accordance with an increase in the negative pressure generated in the ejector.
[0009]
According to a third aspect of the present invention, in the pump device according to the first aspect, the opening / closing means for the internal combustion engine and the compressor has a cylinder that slidably supports the valve body, and the cylinder is It is characterized by communicating with the main communication path.
[0010]
According to a fourth aspect of the present invention, in the pump device according to the second or third aspect, the valve body is constituted by a shutter valve capable of opening and closing the intake portion.
[0011]
According to a fifth aspect of the present invention, in the pump device according to the second or third aspect, the valve body is configured by a butterfly valve that is rotatable in the intake portion.
[0012]
[Action]
According to the first to third aspects of the present invention, the valve body can change the opening amount of the intake portion of the internal combustion engine and the compressor in accordance with the amount of sliding of the piston by the negative pressure generated by the ejector. In particular, the valve body detects the magnitude of the negative pressure generated in the ejector, and changes the opening amount in the intake portion following the change in the sliding amount of the piston according to the magnitude of the negative pressure. Intake replenishment can be continuously performed following the decrease in the intake amount. Thereby, unlike the conventional case, it is possible to compensate for the reduction in the intake air amount according to the reduction degree of the intake air amount without being affected by the intake air pulsation.
[0013]
According to the fourth and fifth aspects of the present invention, the opening / closing operation of the intake section can be opened / closed with a simple configuration without using a special structure.
[0014]
【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 (negative pressure) generated by the ejector 4 is used, for example, in the crushed soil suction device used in the soil excavation work described above, or the positive pressure / negative in the pipe described in the prior art. Used to generate air flow in pipes by pressure generation.
[0015]
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 in the intake portion of the engine 2 and an air cleaner 7 located in the intake portion of the compressor 3. The ejector 4 uses intake air in the engine 2 and the compressor 3. The vacuum suction force can be increased.
[0016]
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.
[0017]
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 have a configuration in which the opening / closing amount is controlled following the suction pressure (negative pressure) of the intake air from the ejector 4 introduced into the main communication passage 5.
[0018]
That is, the first and second opening / closing control means 8 and 9, the internal combustion engine opening / closing means 12, and the compressor opening / closing means 13 have the following operating characteristics.
(1) When the negative pressure generated in the ejector 4 reaches the upper limit (minimum vacuum pressure), only the internal combustion engine switching means 12 and the compressor switching means 13 are opened according to the suction pressure generated in the ejector 4. Thus, the atmosphere can be directly introduced into the engine 2 and the compressor 3. 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.
[0019]
(2) When the lower limit value (maximum vacuum pressure) of the negative 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.
[0020]
For this reason, the principle structure shown in FIG. 2 is adopted for the opening / closing means 12 for the internal combustion engine and the opening / closing means 13 for the compressor.
In FIG. 2, the opening / closing means A is a shutter valve that has swing ends at both ends, is provided with a fulcrum B between the swing ends and is swingably supported, and can reciprocate through the opening of the intake pipe Ps. It is configured.
One of the swing ends A1 is an end portion that opens and closes an intake pipe on the engine 2 side or the compressor 3 side (denoted by reference sign Ps for convenience), and the other end of the swing end is hooked with one end of a return spring C. Yes.
In addition to the return spring C, one end of a piston rod D1 for swinging the opening / closing means A in a direction opposite to the biasing direction by the return spring C is connected to the other end of the swing end.
The piston rod D1 is integrated with a piston D that is slidable in the cylinder E, and the suction pressure (P) of the ejector 4 acts on the cylinder E on the side opposite to the connecting position of the piston rod D1 in the piston. It is like that.
[0021]
At the other end of the swing end, the connecting position of the return spring C and the connecting position of the piston rod D1 are different from the fulcrum position. In particular, the distance from the fulcrum position to the connecting position of the return spring C is made larger than that of the connecting position of the piston rod D1 by increasing the moment at the position of the return spring C. This is to prevent the shape dimension, that is, the coil diameter and the winding diameter from increasing.
The return spring C is usually given an elastic force capable of closing the intake pipe Ps by one of the swinging ends of the opening / closing means A, and the suction of the ejector 4 acting in the cylinder E with respect to this elastic force. When the pressure is won, it expands according to the difference, thereby swinging the opening / closing means A and changing the opening amount of the intake pipe Ps by one of the swinging ends A1.
[0022]
The adjustment of the opening amount of the intake pipe Ps is based on the relationship between the suction pressure (negative pressure) generated by the ejector 4 shown in FIG. 3 and the intake amount.
FIG. 3 is a diagram showing a result of an experiment on the relationship between the suction pressure (negative pressure) generated by the ejector 4 and the intake air amount (suction flow rate). In FIG. The relationship between the suction pressure and the intake air amount is shown. The result indicated by reference numeral S2 indicates that the ejector 4 in the case where the suction pressure on the ejector 4 side is increased by replenishing the discharge air from the compressor 3 in addition to the ejector 4 is shown. In addition to the result indicated by reference sign S2, the result indicated by reference sign S3 indicates the relationship between the suction pressure and the intake amount when the suction force of the engine 2 is increased. Shows the relationship.
As apparent from FIG. 3, the intake air amount tends to decrease as the suction pressure (negative pressure) is applied. In particular, when trying to increase the vacuum suction force by the ejector 4 using the intake air of the compressor 3, the intake air amount decreases when the suction 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 other devices, particularly in this case, if the suction pressure at the ejector 4 is increased by using the intake air from the compressor, the compressor 3 It is necessary to correct the reduction of the intake air amount so that the rotation of the compressor 3 and the engine 2 that drives the compressor 3 is maintained normally and the increase in the suction pressure at the ejector 4 is maintained.
[0023]
Therefore, in this embodiment, as shown in FIG. 4, the intake pipe (in FIG. 2, in FIG. 2) follows the change in the suction pressure by the ejector 4 for the case where the intake air in the compressor 3 is used in addition to the ejector 4. The opening amount of the pipe indicated by the symbol Ps is changed. In FIG. 4, in addition to the case where the intake air in the compressor 3 is used in addition to the ejector 4, the relationship between the suction pressure (negative pressure) and the intake air amount when only the ejector 4 is used, and the compressor 3 and the engine The relationship between the suction pressure (negative pressure) at the ejector 4 and the intake air amount when the intake air of 2 is used is also shown. In FIG. 4, it is clear that in the state indicated by reference signs α2 and α3, the amount of intake air is reduced as the number of devices related to intake air decreases in comparison with the state indicated by reference sign α1.
In FIG. 2, the piston rod D <b> 1 corresponds to a change in the balance between the suction pressure from the ejector 4 acting on the cylinder E and the elastic force of the return spring C, in particular, according to the magnitude of the suction pressure with respect to the elastic force of the return spring C. The opening amount with respect to the intake pipe P is changed by changing the swinging amount of the opening / closing means A. In this embodiment, as the elastic force of the return spring C, the engine 2 side is given a characteristic of fully opening the intake pipe Ps at a lower pressure than the compressor 3 side. By making the full opening pressure on the engine 2 side low, the operating state of the engine 2 for improving the discharge efficiency of high-pressure air from the compressor 3 can be maintained.
Of course, the return spring C can be adjusted to change the elastic force so as to secure a minimum amount of intake air.
[0024]
Based on the above principle, the configuration of the pump device according to the present embodiment is shown in FIG.
FIG. 5 is a partial cross-sectional view for explaining the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13, in which an engine (a member denoted by reference numeral 2 in FIG. 1) and a compressor (FIG. 1). The valve bodies 20 and 20 'serving as the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 are disposed at the air opening portions of the intake pipes 2A and 3A.
Since the valve bodies 20 and 20 ′ have substantially the same configuration, the valve body on the engine 2 side will be described as follows. In addition, regarding the valve body 20 ′ of the compressor opening / closing means 13, a dash is added to the reference numeral.
As shown in FIG. 5, the valve body 20 includes a support bracket 23 fixed to the soundproof housing 1 </ b> A portion of the pump device 1, a valve body 24, a return spring 25, and a cylinder 26 having a piston 26 </ b> A as main parts. ing.
As shown in FIG. 6, the support bracket 23 is fixed to the soundproof housing 1 </ b> A of the pump device 1 with the intake pipe 2 </ b> A partially inserted therein, and supports a fulcrum shaft 28 of the valve body 24 described later. A protrusion 23A is provided at a position having a predetermined distance with respect to the fulcrum shaft 28, and one end of a return spring 25 is hooked on the protrusion 23A. The fulcrum shaft 28 is supported by a pair of bearings 28A in a region having a certain length in the axial direction. As a result, the valve body 24 is prevented from being tilted by the negative pressure generated at the atmospheric opening of the intake pipe 2A, and the operation of the valve main body 24 is prevented from being parallel to the atmospheric opening.
When the valve body 24 is tilted without being parallel to the atmosphere opening, the valve body 24 rubs against the edge of the atmosphere opening, and the atmosphere opening cannot be smoothly opened. Trouble is solved.
As shown in FIG. 6, the valve main body 24 is supported by a fulcrum shaft 28 so as to be swingable. One of the swing ends is a lid that can block the intake pipes 2A and 3A. On the other side, the other end of the return spring 25 is hooked. A guide hole 24A is formed at one of the swing ends of the valve body 24 in accordance with a swing locus with respect to the fulcrum shaft 28. The guide hole 24A is fixed to the soundproof housing 1A of the pump device 1. The guide rod 29 is inserted.
The valve body 24 is connected to a rod of a piston 26 </ b> A constituting a negative pressure piston closer to the fulcrum shaft 28 than the return spring 25 located at the other end of the swing end, and the piston 26 </ b> A is taken into the main communication passage 5. A suction passage 26B having a mouth is slidably disposed in a cylinder 26 that is in communication with the opposite side of the rod of the piston 26A. The suction passage 26B is provided for detecting the suction pressure (negative pressure) generated in the ejector 4 and setting the sliding amount of the piston 26A. In FIG. 5, symbol PA indicates the flow direction of the suction air by the ejector 4.
[0025]
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 that uses these compressed air and exhaust as driving 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.
[0026]
Further, when the engine 2 is in operation, only the first and second opening / closing control means 8 and 9 are opened when the suction pressure generated in the ejector 4 corresponds to the lower limit value. 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. Thus, in addition to the vacuum suction force generated in the ejector 4, the intake air is used in the engine 2 and the compressor 3, so that the vacuum suction force in the ejector 4 is increased and 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.
[0027]
When the suction pressure (negative pressure) generated in the ejector 4 reaches the upper limit value, that is, the suction pressure by the intake air of the engine 2 and the compressor 3 in addition to the original suction pressure of the ejector 4 is set to be higher than the suction pressure of the ejector 4 When the value is reached, only the opening / closing means 12 for the internal combustion engine and the opening / closing means 13 for the compressor are opened following the suction pressure in the ejector 4. In other words, the valve body 24 urged by the return spring 25 so as to close the atmospheric opening is the ejector 4 in a balanced state with the suction pressure (negative pressure) at the ejector 4 acting on the cylinder 27 side with respect to the return spring 25. When the suction pressure (negative pressure) exceeds the elastic force of the return spring 25, it swings in a direction to continuously open the atmospheric opening according to the difference. 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.
[0028]
According to the above embodiment, since the fulcrum shaft 28 of the valve body 24 is supported by the single bearing 28A arranged in parallel in the axial direction, tilting due to the negative pressure generated in the atmospheric opening is prevented. The valve body 24 can oscillate in parallel with the atmospheric opening, thereby preventing the occurrence of sliding resistance when opened.
[0029]
Next, a modified example of the internal combustion engine opening / closing means 12 and the compressor opening / closing means 13 will be described with reference to FIG.
FIG. 7 is a schematic view corresponding to FIG. 2 for explaining the principle configuration of the opening / closing means. In FIG. 7, the opening / closing means includes a butterfly valve G which is disposed in the intake pipe Ps ′ and is rotatable. .
An operating member L for rotating the butterfly valve G extends in a direction perpendicular to the extending direction of the intake pipe Ps ′, and a part thereof is fixed to the rotation center of the butterfly valve G. The actuating member L has one end connected to the piston rod D1 for rotating the butterfly valve G and the other end connected to the return spring C ′, as in the case shown in FIG. .
The butterfly valve G changes the rotation angle according to the movement amount of the piston rod D1, and changes the opening / closing amount of the intake passage Ps.
In such a configuration, when the suction pressure of the ejector 4 acting in the cylinder E ′ wins against the elastic force of the return spring C, the rotation angle of the butterfly valve G is increased by pulling the operating member L. The opening amount of the intake pipe Ps is increased.
[0030]
【The invention's effect】
As described above, according to the first to third aspects of the present invention, the negative pressure generated in the ejector is detected, and the valve body is arranged in the intake portion of the internal combustion engine and the compressor in accordance with the amount of sliding of the piston by the negative pressure. The amount of opening can be changed. In particular, since the valve body changes the opening amount at the intake portion following the change in the sliding amount of the piston according to the magnitude of the negative pressure generated in the ejector, it continuously follows the decrease in the intake amount. The intake can be supplemented. Unlike conventional cases, this makes it possible to supplement the intake amount continuously according to the degree of decrease in intake amount without being affected by intake pulsation. It is possible to promote the increase in the vacuum suction force by the vacuum suction device by eliminating the defect and the shortage of intake air in the compressor.
[0031]
According to the fourth and fifth aspects of the present invention, a shutter valve or a butterfly valve is used as a configuration for securing an intake air amount for performing normal operation in an internal combustion engine and a compressor without using a special structure. The normal operation of the internal combustion engine and the compressor can be maintained only by using a simple configuration.
[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.
2 is a schematic diagram for explaining the principle structure of an opening / closing means for an internal combustion engine and a compressor used in the pump device shown in FIG. 1. FIG.
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;
4 is a diagram showing the relationship between the suction pressure and the intake air amount for explaining the use state of the opening / closing means described in FIG. 2;
FIG. 5 is a partial cross-sectional view for explaining a main configuration of the pump device shown in FIG.
6 is a partial perspective view for explaining a configuration of a valve body used in the main configuration shown in FIG. 5. FIG.
7 is a schematic view for explaining the principle structure of a modification of the internal combustion engine and compressor opening / closing means used in the pump device shown in FIG. 1; FIG.
[Explanation of symbols]
1 Pumping device
1A Soundproof housing
2 Engine as an internal combustion engine
3 Compressor
4 Ejecta
5 main passages
8 First opening / closing control means
9 Second opening / closing control means
10 Internal combustion engine required auxiliary communication passage
11 Compressor secondary communication passage
12 Opening / closing means for internal combustion engine
13 Compressor opening and closing means
20, 20 'valve
24, 24 'valve body
25, 25 'Return spring
26A, 26A 'piston
26, 26 'cylinder
A Shutter valve
G Butterfly valve

Claims (5)

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, and taking in intake air from the ejector into the internal combustion engine and the compressor, For the internal combustion engine and the compressor, a pump device configured to directly take in air separately from the ejector side,
An internal combustion engine opening / closing means and a compressor opening / closing means disposed on the air intake side of the internal combustion engine and the compressor;
The opening / closing means for the internal combustion engine and the opening / closing means for the compressor are connected to a slidable piston by detecting a negative pressure generated in the ejector, and change an opening / closing amount in the intake portion of the internal combustion engine and the intake portion of the compressor. A valve body for changing the opening and closing amount in accordance with the intake air amount in the internal combustion engine and the compressor that changes according to the suction pressure generated by the ejector, and the intake air in the internal combustion engine and the compressor A pump device configured to prevent an amount from becoming less than a minimum intake amount. The pump device according to claim 1, wherein
The valve element provided in the opening / closing means for the internal combustion engine and the compressor always has a habit of closing the intake portions of the internal combustion engine and the compressor, and the negative pressure generated in the ejector with respect to the habit The pump device is characterized in that the opening amount of the intake section is increased as the air pressure increases. The pump device according to claim 1, wherein
The opening / closing means for the internal combustion engine and the compressor has a cylinder that slidably supports the valve body, and the cylinder communicates with the main communication passage. The pump device according to claim 2 or 3,
The said valve body is comprised with the shutter valve which can open and close the said intake part, The pump apparatus characterized by the above-mentioned. The pump device according to claim 2 or 3,
The said valve body is comprised with the butterfly valve which can rotate within the said intake part, The pump apparatus characterized by the above-mentioned.

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