JP2021185312A - High pressure air generator - Google Patents

Abstract

To provide a high pressure air generator which jets or sucks air and can suppress power consumption by reducing electric current flowing in a drive motor when driving a blower.SOLUTION: The high pressure air generator includes: a clutch which intermits power transmitted from an electric motor to a blower; and a control section which controls driving of the electric motor and intermitting of the clutch. The high pressure air generator further includes: operation detection means which detects a jetting or sucking operation when the electric motor is driven in a state of cutting the clutch while driving the blower in a state that driving of a drive motor is stopped and the clutch is cut and subsequently the clutch is connected and operated; and advance preparation detection means which detects advance preparation which is necessarily performed before the operation. The control section is configured to drive the electric motor when the advance preparation is detected and connect and operate the clutch when the jetting or sucking operation is detected.SELECTED DRAWING: Figure 7

Description

The present invention relates to a high-pressure air generator that ejects or sucks air.

A high-pressure air generator that ejects or sucks air and includes a blower and an electric motor for driving the blower is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-198004

The high-pressure air generator in the above document can generate high-pressure air without providing an air tank like a normal compressor, so that the configuration can be simplified, but driving and driving stop are frequently repeated. In this case, the power consumption increases due to the current (starting current) flowing through the drive motor when the electric motor is driven.

The present invention provides a high-voltage air generator that ejects or sucks air and can reduce the current flowing through the drive motor when the blower is driven to keep the power consumption low. Make it an issue.

In order to solve the above problems, it is a high-pressure air generator that ejects or sucks air, and is a blower, an electric motor, a clutch that interrupts the power transmitted from the electric motor to the blower, and a drive and clutch of the electric motor. The control unit includes a control unit for controlling the interruption and discontinuity, an operation detecting means for detecting the operation of ejection or suction, and a preparatory detection means for detecting the preparatory preparation inevitably performed prior to the operation. parts, when driving the blower, a condition that the driving motor is driven, is configured so that is operatively connected to the clutch, further, and the clutch the drive motor drives stopped is cut When the blower is driven in this state, the electric motor is driven with the clutch disengaged, and then the control unit is prepared by the preparation detecting means when the clutch is connected and operated. When is detected, the electric motor is driven, and when the operation of ejection or suction is detected by the operation detecting means, the clutch is connected and operated .

The preparatory detection means may be a power on / off detecting means for detecting the on / off of the power.

A high-pressure air generator that ejects or sucks air, and is a blower, an electric motor, a clutch that interrupts the power transmitted from the electric motor to the blower, and a control unit that controls the drive of the electric motor and the engagement and disengagement of the clutch. When driving the blower, the control unit is configured to connect and operate the clutch on condition that the drive motor is driven, and further, the drive motor is driven and stopped. When driving the blower with the clutch disengaged, the electric motor is driven with the clutch disengaged, and then when the clutch is connected and operated, the control unit is used with the blower. If it receives a command to be driven, the clutch in a state of being cut by driving the electric motor, which then on condition that checks a passage of a predetermined time by the timer, and configured to connect operating the clutch May be.

The blower may be a roots blower.

A cooling fan for cooling the electric motor, an air flow path to the cooling fan side, and a flow path for flowing high-temperature air blown from the cooling fan and after cooling the electric motor to the blower side. It may be provided.

When driving the blower, the clutch is connected and operated on condition that the drive motor is driven, so that it is prevented from starting the drive of the electric motor under a high load state, and the electric motor is operated when the blower is driven. The current flowing through the motor is reduced, and it becomes possible to keep the power consumption low.

It is a plan sectional view of the high pressure air generator to which this invention was applied. It is a side sectional view of the high pressure air generator to which this invention is applied. It is a circuit diagram which shows the flow control composition of the air of this high-voltage air generator. In the cross-sectional view of the roots blower, (A), (B) and (C) show the intake state, the compression state and the exhaust state of one rotor, respectively. (A) and (B) are a side view and a front view showing the switching structure between the retracted state and the used state of the injection nozzle. It is a block diagram which shows the structure of a control part. It is a processing flow diagram of a control part. It is a processing flow diagram of the control part which concerns on another Embodiment of this invention.

1 and 2 are a plan sectional view and a side sectional view of a high-voltage air generator to which the present invention is applied. The high-pressure air generator shown in these drawings includes a housing 1 that is formed into a rectangular parallelepiped shape and whose upper part is opened and closed. Various devices are installed in the housing 1 to form the device main body 2. By the way, here, high pressure means higher pressure than atmospheric pressure.

The apparatus main body 2 includes a base 4 which is a horizontal plate raised from the bottom surface of the housing 1 by a plurality of spacers 3, a roots blower (blower, air pump) 6 installed on the upper surface side of the base 4, and an air pump. Connected to the strainer (filter) 7 installed on the intake port 6a side of the roots blower 6, the intake pipe 8 for sucking air from the outside to the inside of the housing 1, and the inner end of the housing 1 in the intake pipe 8. The intake side muffler 9 is provided, the exhaust pipe 11 for exhausting air from the inside of the housing 1 to the outside, the exhaust side muffler 12 connected to the inner end of the housing 1 in the exhaust pipe 11, and the exhaust side. From the connection pipe 13 that connects the end of the muffler 12 opposite to the side to which the exhaust pipe 11 is connected and the exhaust port 6b of the roots blower 6, the DC or AC electric motor 14, and the electric motor 14. It is provided with a transmission mechanism 16 that transmits the output power to the roots blower 6.

The roots blower 6 is arranged on one side in the longitudinal direction (longitudinal direction) in the housing 1, and the intake side muffler 9 and the exhaust side muffler 12 are arranged on the other side. The intake pipe 8 and the intake side muffler 9 are arranged on one side in the short axis direction (lateral direction) of the housing 1, and the exhaust pipe 11 and the exhaust side muffler 12 are arranged on the other side in the lateral direction of the housing 1. Immediately below the intake side muffler 9 and the exhaust side muffler 12, the above-mentioned electric motor 14 is arranged sideways.

The roots blower 6 has a casing in which its intake port 6a faces the side closer to the air outflow portion 9a of the intake side muffler 9 and its own exhaust port 6b faces the side far from the intake side muffler 9 and the exhaust side muffler 12. It is installed in the body 1. The pair of strainers 7 formed in a columnar shape extending in the vertical direction are arranged on the front side of the air outflow portion 9a of the intake side muffler 9 in a state of protruding upward from the intake port 6a of the roots blower 6.

The transmission mechanism 16 includes a main pulley 18 that is directly connected to the output shaft 17 of the electric motor 14 and that rotates integrally with the output shaft 17, a driven pulley 19 that is rotatably supported on the roots blower 6 side, and a main pulley 18 and a driven pulley. The annular transmission belt 21 hung around the transmission belt 21, the tension pulley 22 that applies tension to the transmission belt 21, and the rotational power on the driven pulley 19 side are intermittently transmitted to the roots blower 6 to turn on / off the drive of the roots blower 6. It has a clutch 23 (see FIGS. 3 and 6) to perform.

The transmission belt 21 uses a polydrive belt in this example. In this example, the clutch 23 employs a dry single plate electromagnetic clutch. The clutch 23 is provided between the driven pulley 19 and the passive shaft 24 that inputs power to the roots blower 6, and intermittently switches the power transmission between the driven pulley 19 and the passive shaft 24. Incidentally, the intermittent switching of the power to the roots blower 6 by the clutch 23 can be executed even while the electric motor 14 is being driven. In other words, the clutch 23 is provided with a synchronization means for synchronizing the rotation speeds of the driven pulley 19 and the passive shaft 24.

FIG. 3 is a circuit diagram showing a flow control configuration of the air of the high-voltage air generator. The air taken into the housing 1 from the intake pipe 8 via the intake side muffler 9 is discharged into the housing 1 from the air outflow portion 9a of the intake side muffler 9. The outflowed air flows into the input side flow path P1 formed in the intake port 6a via the strainer 7.

The air in the intake side flow path P1 is increased in pressure by the roots blower 6 to become high pressure air, and is discharged to the output side flow path P2. By the way, the air flow following the intake pipe 8, the intake side muffler 9, the strainer 7 and the input side flow path P1 is generated by the suction force of the roots blower 6, but separately from the roots blower 6, the intake fan 26 is installed in the strainer. It may be provided in 7 or near the entrance thereof. Incidentally, the intake fan 26 may be driven by the power of the electric motor 14 described above, or may be driven by an actuator such as a separately provided electric motor.

The high-pressure air exhausted to the output side flow path P2 passes through the heat storage device 27, stores heat in the heat storage device 27, and then reaches the branch flow path P3. The air in the branch flow path P3 is flowed to at least one of the exhaust side flow path P4 and the reduction flow path P5 via a switching valve 28 composed of an electromagnetic proportional control valve.

The air of the exhaust side flow path P4 is exhausted to the outside through the connection pipe 13 and the exhaust side muffler 12, while the air of the reduction flow path P5 is returned to the input side flow path P1.

The switching valve 28 has an "exhaust state" in which the air on the branch flow path P3 side flows only in the exhaust side flow path P4, and a "reduction state" in which the air on the branch flow path P3 side flows only in the reduction flow path P5. "Branch state" in which the air on the branch flow path P3 side flows into both the exhaust side flow path P4 and the reduction flow path P5.
To switch to either.

When switching to the exhaust state is performed, the high-pressure air discharged from the roots blower 6 is directly exhausted from the exhaust pipe 8.

When switching to the reduction state or the branch state, at least a part of the air is output side flow path P2 → reduction flow path P5 → input side flow path P1 → roots blower 6 → output side flow path P2 → ... Circulate. In the process of this circulation, the temperature is raised by increasing the pressure of the air, and by storing this heat in the heat storage device 27, the heating of the air can be realized in a heaterless state.

When switching to the branch state, the air can be exhausted in the same way as when switching to the exhaust state, but along with the exhaust, the air can be returned to the input side of the roots blower 6 by a predetermined amount. It will be possible. Incidentally, when the circulating air reaches a predetermined pressure and temperature, further circulation is unnecessary, so that the reduction state is switched to the exhaust state or the branch state, or the branch state is switched to the exhaust state.

Further, since the switching valve 28 is a proportional control valve, the opening degree to the exhaust side flow path P4 can be changed, and the amount of high-pressure air to be exhausted can be appropriately adjusted according to the configuration. The opening degree to the reduction flow path P5 side may also be adjustable.

Incidentally, the output side flow path P2, the heat storage device 27, the switching valve 28 and the exhaust side flow path P4 may be provided on the exhaust port 6b side of the roots blower 6, but due to space problems, the output side flow path P2 and the exhaust side are exhausted. A part of the side flow path P4, the heat storage device 27, and the switching valve 28 may be provided outside the exhaust port 6b of the roots blower 6.

According to such an air flow control, the air can be heated without a heater by using the heat storage device 27, and in addition to this, the heat generated from the electric motor 14 can be used.

Specifically, as shown in FIG. 2, the electric motor 14 has a plurality of heat radiating fins 29 protruding radially over the entire circumference on the peripheral surface, and air is allowed to flow between the adjacent heat radiating fins 29. A cooling fan 31 that takes heat from the heat radiating fins 29 is provided.

Then, as shown in FIG. 1, a part of the air flowing out from the air outflow portion 9a of the intake side muffler 9 passes between the pair of strainers 7 and 7 arranged in the horizontal direction and is on the wall surface side of the housing 1. Flows and reaches the electric motor 14 side. The air that has reached the electric motor 14 side is flowed from one end side to the other end side of the electric motor 14 by the cooling fan 31, and in this process, heat is taken from the heat radiation fins 29 and heated. The air heated in this way flows from the strainer 7 into the roots blower 6.

In other words, a flow path that allows air to flow from the air outflow portion 9a of the suction side muffler 9 to the cooling fan 31 side by adjusting the gap, adjusting the position of the strainer 7, and adjusting the air blowing direction and arrangement of the cooling fan 31. A C1 and a flow path C2 for flowing the air blown by the cooling fan 31 and heated by the electric motor 31 to the strainer 7 side (roots blower 6 side) are formed in the housing 1.

FIG. 4 is a cross-sectional view of a roots blower, and (A), (B) and (C) show an intake state, a compression state and an exhaust state of one rotor, respectively. As the roots blower 6, a two-leaf roots blower, a three-leaf roots blower, a vane-type roots blower, or the like can be used, but in this example, a two-leaf roots blower is used.

The roots blower 6 has a pair of rotors 32, 33 and a casing 34 that houses the pair of rotors 32, 33.

The rotors 32 and 33 are made of a lightweight and hard heat-resistant synthetic resin material, and hollow portions 32a and 33a are formed inside the rotors 32 and 33 for the purpose of further weight reduction. The pair of rotors 32 and 33 are rotationally driven in opposite directions so that their phases are always shifted by a quarter cycle from each other.

The casing 34 is made of a metallic member. An intake port 34a and an exhaust port 34b are formed in the casing 34 so as to face each other.

While the rotors 32, 33 are rotationally driven, the gap between the pair of rotors 32, 33 is always kept minute, and the gap between the pair of rotors 32, 33 and the inner wall surface of the casing 34 is maintained. Is always kept minute.

Then, one rotor 32 takes in air from the intake port 34a every quarter cycle (see FIG. 4 (A)) and a compressed state in which the sucked air is compressed (FIG. 4 (B)). (See) and the exhaust state for exhausting the compressed air (see FIG. 4C) are repeated in this order. Further, the other rotor 33 is shifted from the one rotor 32 by a quarter cycle, and the intake state, the compression state, and the exhaust state are repeated in the same order.

A filter 36 for removing impurities and the like may be provided in the intake port 34a and the exhaust port 34b. In the example shown in FIG. 4, the filter 36 is provided in the intake port 34a of the casing 34 as shown by a virtual line. There is.

5 (A) and 5 (B) are a side view and a front view showing a switching configuration between a retracted state and a used state of the injection nozzle. In the illustrated example, an injection nozzle (vent) 37 for injecting air is connected to the tip of the exhaust pipe 11. The injection nozzle 37 is formed from the device main body 38 formed into a cylindrical shape, the nozzle 39 protruding from the tip end portion of the device main body 38 so as to extend further beyond the device main body 38, and the middle portion of the device main body 38. It has a grip portion 41 projecting in a direction intersecting (specifically, orthogonal to) the device main body 3. Incidentally, the tip end portion of the exhaust pipe 11 described above is connected to the end portion (base end portion) side opposite to the tip end portion where the nozzle 39 of the exhaust pipe 11 is projected.

The grip portion 41 is provided with a momentary type operation button (operation detecting means) 42 that can be pushed and operated. When the operator grips the grip portion 41, points the nozzle 39 toward the target portion, and presses the operation button 42, the air pressure increased by the roots blower 6 is ejected from the tip side of the nozzle 39 to the target portion, and the target portion is sprayed. Blow off foreign matter such as dust in the part.

While the injection nozzle 37 is used by the operator in this way, it is in a stored state (stored state) in an unused state. To specifically explain this stored state, the fixture 44 is externally fixed to the support column 43 extending in the vertical direction so as to be adjustable in the axial direction, and the tubular support 46 extending in the vertical direction is attached and fixed to the fixture 44. Has been done. When the injection nozzle 37 is in the retracted state, the outer peripheral surface of the injection nozzle 37 (more specifically, the apparatus main body 38) in which the grip portion 41 is inserted on the inner peripheral surface side of the support 46 is a pair of holding plates 47, 47. It is elastically pinched and locked from below.

When the direction in which the injection nozzle 37 in the retracted state faces is the front-rear direction, the lower halves of the pair of holding plates 47 and 47 are fixed to the left and right side surfaces of the support 46, respectively, and the upper part of each holding body 47. Is in a state of protruding upward from the support 46.

The support 46 is provided with a detection switch (retracted state detecting means) 48 for detecting the presence or absence of the retracted state of the injection nozzle 37. Specifically, in the outer peripheral surface of the support 46, either the surface near the tip of the injection nozzle 37 in the retracted state (front surface) or the surface near the base end (rear surface) (in the illustrated example). The above-mentioned detection switch 48 is installed on the front) side.

The detection switch 48 has a detection body 48a and a switch body 48b that swingably supports the detection body 48a. The detector 48a is elastically urged to a swing position (initial position) overlapping with the injection nozzle 37 (device main body 38) in the axial direction (front view) of the injection nozzle 37 in the retracted state, and the injection nozzle 37 is moved. In the retracted state, the detection body 48a is swung to a position (detection position) that does not wrap with the injection nozzle 37 in front view due to contact with the outer peripheral surface of the apparatus main body 38.

The detection switch 48 detects that the detection body 48a is switched from ON to OFF (or from OFF to ON) by swinging from the initial position to the detection position, and is in the retracted state. On the other hand, the detection switch 48 detects that the detection body 48a is switched from OFF to ON (or ON to FF) by the swing from the detection position to the initial position, and is no longer in the retracted state.

In the high-voltage air generator having the above mechanical configuration, the control unit 49 (see FIG. 6) composed of a microcomputer, a control circuit, etc. detects the presence or absence of operation by the operation button 42 and the stored state by the detection switch 48. Based on the presence / absence detection and the like, the on / off control of the drive of the electric motor 14, the engagement / disengagement control of the clutch 23, and the switching control of the switching valve 28 are performed.

FIG. 6 is a block diagram showing the configuration of the control unit. On the input side of the control unit 49, the above-mentioned operation button 42 and detection switch 48, a power on / off detection means 51 for detecting ON / OFF (on / off) of the power of the high voltage air generator, and the inside of the high voltage air generator. The pressure detecting means 52 for detecting the pressure of the predetermined portion of the above is connected to the temperature detecting means 53 for detecting the temperature of the predetermined portion in the high pressure air generator. On the other hand, the electric motor 14, the clutch 23, and the switching valve 28 described above are connected to the output side of the control unit 49.

The control unit 49 switches the state by the switching valve 28 according to the pressure and temperature in the high-pressure air generator.

For example, when the temperature detecting means 53 detects that the temperature of the heat storage device 27 has risen to a predetermined value or more, the control unit 49 determines that the heat storage in the heat storage device 27 is sufficient, and the switching valve 28 Depending on the method, switching from the reduction state to the branch state or the exhaust state, or switching from the branch state to the exhaust state is performed.

Further, the control unit 49 determines by the pressure detecting means 52 that the pressure in the input side flow path P1, the output side flow path P2, the heat storage device 27, or the branch flow path P3 has risen to a predetermined value or more. When it is detected, in order to lower the pressure, the switching valve 28 switches from the reduction state to the branch state or the exhaust state, or from the branch state to the exhaust state.

By the way, when switching (starting) from the OFF state to the ON state of the electric motor 14, the current (starting current) flowing through the electric motor 14 is one of the major factors for the increase in power consumption.

In order to reduce the starting current, when driving the roots blower 6, the control unit 49 disengages the clutch 23 and cuts off the power transmission from the electric motor 14 to the roots blower 6 to the electric motor 14. By starting the power supply, the electric motor 14 is started in the idle state (low load state or no load state), and then the clutch 23 is connected.

Specifically, the control unit 49 drives the electric motor 14 when it detects the preparation that is inevitably performed prior to the pressing operation of the operation button 42, which is an operation for injecting by the injection nozzle 37. When (started) and the pressing operation of the operation button 42 is detected, the clutch 23 is switched from the disengaged state to the connected state.

Incidentally, in this example, the work of changing the injection nozzle 37 from the stored state to the non-stored state and the work of turning on the power of the high-voltage air generator are the above-mentioned preparations. That is, the power on / off detecting means 51 and the stored state detecting means 48 described above each function as preparatory detection means for detecting preparatory work.

The contents of the control unit 49 as described above will be described below along with the processing procedure.

FIG. 7 is a processing flow diagram of the control unit. When the control unit 49 starts the process, the control unit 49 proceeds to the process in step S101. In step S101, the presence or absence of pre-preparation is confirmed by the pre-preparation detecting means 48 and 51 described above, and if it is confirmed that pre-preparation has been performed, the process proceeds to step S102.

In step S101, the preparation may be confirmed only when the power ON / OFF detection means 51 confirms that the power is turned on, and the preparation may be confirmed only when the detection switch 48 confirms that the power is not in the retracted state. It may be confirmed, or the preparation may be confirmed only when both the confirmation of the power ON and the confirmation of the non-retracted state are confirmed.

In step S102, the electric motor 14 is driven and the process proceeds to step S103. In step S103, if the operation button 42 detects an operation for ejecting the high-voltage air (pressing operation of the operation button 42), the process proceeds to step S104, but if not detected, the process returns to step S101. In step S104, the clutch 23 is connected, the roots blower 6 is driven, and the process is returned to step S101.

If the preparation is not confirmed in step S101, the process proceeds to step S105. In step S105, the clutch 23 is disengaged and the process is returned to step S101.

By the above processing procedure, the starting current of the electric motor 14 is reduced, so that the total current consumption can be reduced, and it becomes easy to perform intermittent drive in which the high-voltage air is repeatedly ejected and stopped.

It is also possible to reduce the voltage and the starting current by the soft starter at the start of power supply of the electric motor 14. Further, the electric motor 14 is connected in parallel with a magnet conductor equipped with a thermal protector (overheat protection device) to protect the electric motor 14 having reached the rated rotation speed.

Further, in this high pressure air generator, an intake nozzle (ventilator) (not shown) may be connected to the intake pipe 8 side and used for a vacuum cleaner or the like. In this case, the configuration for detecting the stored state can be the same as that for the injection nozzle 37.

Further, the state switched by the above-mentioned switching valve 28 may be limited to only two states, a reduction state and a branch state, or only two states, a reduction state and an exhaust state, or a branch state, for the purpose of simplifying the structure. There may be only two states, a state and an exhaust state. In addition, the switching valve 28 may be changed from a proportional control valve to a directional switching valve to simplify the configuration.

Further, in the above-mentioned example, as the clutch 23, an electromagnetic type clutch that can be directly controlled by an electric control signal from the control unit 49 is used, but as the clutch 23, the presence or absence of tension of the transmission belt 21 is switched. A tension pulley that interrupts the power transmission to the roots blower 6 may be used. In this case, the clutch 23 is intermittently operated by an electric motor (not shown) that can be directly controlled from the control unit 49.

Next, with reference to FIG. 8, a portion different from the above-described embodiment of the present invention will be described.

FIG. 8 is a processing flow diagram of the control unit according to another embodiment of the present invention. The control unit 49 starts processing from step S201. In step S201, the presence or absence of a command signal for ejecting or sucking air is confirmed, and if there is a command, the process proceeds to step S202, while if there is no command, the process of step S201 is repeated.

In step S202, the electric motor 14 is driven, and the process proceeds to step S203. In step S203, the counter built in the control unit 49 is used to start counting, and the process proceeds to step S204. In step S204, it is confirmed whether or not the count started in step S203 has been completed, and if it has not been completed, the process of step S204 is performed again, and if the count has been completed, the process proceeds to step S205.

In step S205, the clutch 23 is connected, the roots blower 6 is driven, and the process is returned to step S201. According to such a processing procedure, the processing of step S204 is repeated until a predetermined predetermined time (about 2 to 3 seconds in this example) elapses after the electric motor 14 is driven, and the clutch is clutched. Since the 23 is held in the disconnected state and the electric motor 14 is rotated with a low load or no load, the starting current can be reduced.

According to this configuration, it is not necessary to detect the preparation, and it is possible to reduce the starting current by waiting for the lapse of a predetermined time. By the way, since the waiting time is only a few seconds, it does not affect the usability so much.

Such a high-pressure air generator can also be used for supplying air to an incinerator, generating bubbles in water, supplying oxygen to a fishpond, a jet bath, or the like. In addition, this high-pressure air generator can also be used for holding an object by suction. In this case, an intake port is opened in the holding portion of the object formed on the tip end side of the movable arm, and the tip end portion of the intake pipe 8 is connected to this intake port.

Next, a part different from the above-described embodiment will be described with respect to another embodiment of the present invention.

In the above-described embodiment, the control content for driving the roots blower 6 in a state where the electric motor 14 is stopped and the clutch 23 is disengaged has been described. However, in the present embodiment, the roots blower 6 is intermittently driven. The control contents will be described.

Specifically, the roots blower 6 is switched from the drive state to the drive stop state, and then switched from the drive stop state to the drive state again.

First, when switching the roots blower 6 from the drive state to the drive stop state, the electric motor 14 is held in the drive state, and the clutch 23 is switched from the connected state to the disconnected state.

Subsequently, when switching the roots blower 6 from the drive stop state to the drive state, the electric motor 14 is held in the drive state, and the clutch 23 is switched from the disengaged state to the disengaged state.

According to such control contents, when the roots blower 6 is intermittently driven, the electric motor 14 is started to be driven in a state where the clutch 23 is connected and the load is high, and a large amount of current flows through the electric motor 14 to generate electric power. Can be efficiently prevented from being consumed in large quantities. Therefore, it is possible to significantly reduce the power consumption during intermittent driving of the roots blower 6.

Next, a high-pressure air generator with a clutch 23 to which the present invention is applied (hereinafter, “high-pressure air generator A”) and a high-pressure air generator of a comparative example without the clutch 23 (hereinafter, “high-pressure air generator A”). B ”) and the comparative experiment will be explained.

The measuring device used was the "PA400 Power Analyzer" of "Tektronix", and the current value of the electric motor in each state was measured at the Department of Electrical and Electrical Engineering of Shimane Prefectural Industrial Technology Center. The results are as shown below.

According to the above results, the current value at the start of driving of the electric motor 14 in the no-load (low load) state in the high-voltage air generator A, and the subsequent switching from the disengaged state of the clutch 23 to the connected state (load). It was confirmed that the current value at the start of action) was reduced as compared with the current value at the start of driving in the load state of the high-voltage air generator B.

Further, the current value during the intermittent drive of the high-voltage air generator A (roots blower 6) due to the engagement and disengagement of the clutch 23 is the current value during the intermittent drive of the high-voltage air generator B (roots blower) due to the on / off drive of the electric motor 14 in the load state. Compared to the current value of, it is significantly reduced. It is considered that this is because the high voltage air generator A can efficiently utilize the inertia of the electric motor 14.

6 Roots blower (blower, air pump)
14 Electric motor 23 Clutch 37 Injection nozzle (ventilator)
42 Operation buttons (operation detection means)
48 Detection switch (preparation detection means, stored state detection means)
49 Control unit 51 Power on / off detection means (preparation detection means)
C1 flow path C2 flow path

Claims (5)

A high-pressure air generator that ejects or sucks air.
With a blower
With an electric motor
A clutch that interrupts the power transmitted from the electric motor to the blower,
A control unit that controls the drive of the electric motor and the engagement and disengagement of the clutch ,
An operation detecting means for detecting the operation of ejection or suction, and
It is provided with a preparatory detection means for detecting the preparatory steps that are inevitably performed prior to the operation.
Wherein, when driving the blower, a condition that the driving motor is driven, is configured so that is operatively connected to the clutch,
Further, when the blower is driven in a state where the drive motor is stopped and the clutch is disengaged, the electric motor is driven in the state where the clutch is disengaged, and then the clutch is connected and operated. Hits the,
When the preparation is detected by the preparation detection means, the control unit drives the electric motor, and when the operation detection means detects the ejection or suction operation, the clutch is connected and operated. A high-pressure air generator characterized by being configured in the above manner. The high-voltage air generator according to claim 1, wherein the preparatory detection means is a power on / off detecting means for detecting the on / off of the power. A high-pressure air generator that ejects or sucks air.
With a blower
With an electric motor
A clutch that interrupts the power transmitted from the electric motor to the blower,
It is equipped with a control unit that controls the drive of the electric motor and the engagement and disengagement of the clutch.
When driving the blower, the control unit is configured to connect and operate the clutch on condition that the drive motor is driven.
Further, when the blower is driven in a state where the drive motor is stopped and the clutch is disengaged, the electric motor is driven in the state where the clutch is disengaged, and then the clutch is connected and operated. Hits the,
Said control unit, when having received an instruction for driving the blower, the clutch in a state of being cut by driving the electric motor, then, the condition that it has confirmed the elapse of a predetermined time by the timer, the clutch Configured to activate the connection
A high-pressure air generator characterized by this. The high-pressure air generator according to any one of claims 1 to 3 , wherein the blower is a roots blower. A cooling fan that cools the electric motor,
The air flow path to the cooling fan side and
The high-pressure air generator according to any one of claims 1 to 4 , further comprising a flow path for flowing high-temperature air blown from the cooling fan and after cooling the electric motor to the blower side.

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