JPH0824658B2 - Vacuum cleaner for automobiles - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to an on-vehicle automobile electric vacuum cleaner for cleaning dust inside an automobile, and more particularly to an electric circuit for controlling an electric blower. .

(Prior Art) As a conventional electric vacuum cleaner for automobiles, a handheld rechargeable small electric vacuum cleaner called a car cleaner has been generally used. In this conventional electric vacuum cleaner for automobiles, a storage battery as a power source, an electric blower, and a dust collection chamber are provided in a cleaner body having a handle, and a suction port for directly sucking dust is formed on a lower surface of the cleaner body. It had a structure that However, such a handheld compact rechargeable vacuum cleaner uses a battery built into the cleaner body as its power source, so its suction power is weak,
Although small pieces of paper dust and the like could be sucked, almost no soil that was caught on the floor mats in the automobile, that is, the carpet, could be sucked. Further, since the storage battery is small and its capacity is small, the usable time, that is, the operable time is short.

On the other hand, a household electric vacuum cleaner that uses a commercial AC power source as a power source has a large power, that is, a suction work rate, but a vacuum cleaner main body is too large to be used as an electric vacuum cleaner for an automobile, and it is difficult to clean the inside of the automobile. Further, it is very inconvenient because a large vacuum cleaner body and a suction hose have to be carried to the car, and a commercial AC power supply has to be pulled to the car with a long cord. Furthermore, the inside of a car cannot be cleaned in a place where there is no commercial AC power supply, such as when going out.

Therefore, in a small hand-held vacuum cleaner, connect the connector part for connecting to the storage battery mounted on the car to the tip of the cord drawn from the cleaner body, and place this connector part on the handle etc. The structure electrically connected to the electric blower through the installed power switch was also adopted. This automobile vacuum cleaner uses an on-vehicle battery of about 12V DC as a power source. However, even with this conventional structure, since the vacuum cleaner body is small, the electric blower is also limited to a small size, and it has drawbacks such as low power. Further, if the power switch is forgotten to be turned off and the electric blower is left in the operating state, the vehicle battery may be over-discharged, and the engine of the vehicle may not be started. Along with this, while the electric blower is left in the vehicle in a continuous operation state, the temperature of the coil of the electric blower abnormally rises, for example, up to 80 to 90 ° C., due to the ambient temperature inside the vehicle, thereby, The main body of the vacuum cleaner may be deformed, and eventually smoke or ignition may occur.

(Problems to be Solved by the Invention) As described above, in the conventional electric vacuum cleaner for an automobile powered by the on-vehicle battery, forgetting to turn off the power switch causes over-discharge of the on-vehicle battery and excessive temperature rise of the electric blower. There was an easy problem. Also, the power of the electric blower is small,
There was also a problem that the suction work rate was small.

In order to solve the latter problem and increase the suction power, the electric blower may have a high power.
However, in such a high-output electric blower, in the above-described conventional structure in which the power switch is directly inserted in the circuit between the connector section and the electric blower, a large-capacity power switch must be used. However, the large-capacity switch is large in size, limited in variety, and expensive. Since the operated power switch is arranged on the outer surface of the cleaner body, the large size of the switch impairs the design and also makes the cleaner body larger.
For example, when trying to increase the drive current of an electric blower from about 10 A in the past to about 30 A, a rocker switch generally used in an electric vacuum cleaner has a maximum of about 25 A, so a Torg switch or the like must be used.

The present invention is intended to solve such problems, and an object thereof is to provide an electric vacuum cleaner for an automobile, which does not adversely affect the on-vehicle battery, can be inexpensive, has good design, and is compact. It is what

Further, it is an object of the present invention to further improve safety in the electric vacuum cleaner for an automobile.

[Structure of Invention]

(Means for Solving the Problem) An electric vacuum cleaner for an automobile according to the present invention includes a cleaner main body having a dust collecting chamber formed therein in order to achieve the former object.
The cleaner body includes an electric blower built in communication with the dust collecting chamber and a connector portion electrically connected to the electric blower and a vehicle battery, and the connector portion built in the cleaner body. And a relay having a switch inserted in the power supply circuit of the electric blower and a coil for closing the switch when energized, and for a small current inserted in the circuit between the connector section and the coil of the relay. An operation switch including a small rocker switch, a voltage detection circuit that detects a voltage between both electrodes of the connector section and outputs an output according to this voltage, and an output terminal of the voltage detection circuit that is connected in series with the operation switch. Is connected to the input terminal and has a switching element that is closed only when the voltage between the electrodes of the connector section is greater than or equal to a predetermined value. That.

Further, in order to achieve the latter purpose, the automobile electric vacuum cleaner according to claim 2 further includes a timer circuit whose output changes after a lapse of a predetermined time from closing of the operation switch, and an output end of the timer circuit. The output terminal of the voltage detection circuit is connected to the input terminal of the switching element via a logic circuit such as an AND circuit, and this switching element has a voltage between both electrodes of the connector portion within a predetermined time after the closing of the operation switch. The closed state is set only when the value is a predetermined value or more.

(Operation) In the automobile vacuum cleaner of the present invention, when the inside of the automobile is cleaned, the operation switch is operated to be closed, but the voltage detection circuit detects the voltage between both electrodes of the connector portion electrically connected to the on-vehicle battery. It is detected and the result is output to the switching element. If the voltage across the connector section is above a certain value, the switching element connected in series with the operation switch will be in the closed state, and the on-board battery will pass through the connector section, operation switch and switching element to the relay coil. An electric current flows, the switch of the relay is closed,
The power supply circuit between the connector and the electric blower is closed,
Electric power is supplied to the electric blower, and the electric blower operates. As a result, the dust is sucked from the outside into the dust collecting chamber in the cleaner body and captured. On the other hand, when the voltage between the two poles of the connector corresponding to the battery voltage of the on-vehicle battery becomes lower than the predetermined value, the switching element between the connector and the coil is opened, and the coil is de-energized and the relay The switch is opened, the power supply to the electric blower is cut off, and the electric blower stops. Thus
The electric blower cannot be operated before the on-board battery is over-discharged. When the operation switch is in the open state, the coil is in the non-energized state and the electric blower is not operated.

Further, in the automobile electric vacuum cleaner according to the present invention, for example, a logical product of the logical product of the output of the timer circuit and the output of the voltage detection circuit whose output changes after the elapse of a predetermined time from the closing of the operation switch is used. The result is output to the switching element. As a result, if the voltage between the electrodes of the connector is greater than or equal to the predetermined value within a predetermined time after the operation switch is closed, the switching element will be closed and the electric blower will operate. When a predetermined time or more elapses or when the voltage between both electrodes of the connector portion becomes lower than a predetermined value, the switching element is opened and power supply from the vehicle-mounted battery to the electric blower is cut off.

(Embodiment) The first embodiment of the electric vacuum cleaner of the present invention will be described below.
A description will be given with reference to FIGS.

In FIG. 3, 11 is a cleaner body, and this cleaner body is
Reference numeral 11 denotes a pair of main body case members formed of synthetic resin or the like and joined and fixed in the left-right direction by screws or the like. In addition, 12 is a screwing part. And, the external side surface shape of the cleaner body 11, that is, the shape viewed from the side,
The lower surface and the rear surface are orthogonal to each other in a substantially right-angled triangular shape, more precisely in a fan shape, and the front surface is an inclined surface that descends in an arc shape toward the front. The cleaner body 11
A recess 13 is formed in the center of the front surface of the. Further, a recess 14 is formed at the rear portion of the upper surface connected to the front surface of the cleaner body 11.

Further, in the vacuum cleaner body 11, an electric blower chamber 17 is defined by a partition wall 16 on the front side, and a breathable lattice plate 18 formed behind the partition wall 16 allows the electric blower chamber 17 to move up and down. A dust collection chamber 19 extending in the direction is defined along the rear surface of the cleaner body 11. The electric blower chamber 17 and the dust collection chamber 19 are communicated with each other by the communication port 20 formed in the partition wall 16 and the lattice plate 18, but between the partition wall 16 and the lattice plate 18. Is the rectifying space 21. In addition, the recess 14 of the cleaner body 11 is formed with an insertion / removal opening 22 that communicates with the dust collection chamber 19 from above. Further, exhaust ports (not shown) are formed on both side surfaces of the cleaner body 11 so as to face the electric blower 17. Further, a connector opening 23 is formed in the lowermost front part of the cleaner main body 11 across both body case members, and a switch opening 24 is formed in the recess 13. There is.

31 is an electric blower, and this electric blower 31 is composed of an electric motor 32 and a fan (not shown) rotationally driven by the electric motor 32. The fan has a diameter larger than that of the outer frame 32a of the electric motor 32. It is covered by a large fan cover 33. The fan cover 33 has the communication port.
An intake port 34 located inside 20 is formed. On the other hand, a discharge port (not shown) is formed in the side portion of the frame 32a of the electric motor 32. Furthermore, the electric motor
Carbon terminals 36 and 37 are provided on the upper and lower portions of the 32 frame 32a, respectively. The electric blower 31 has its fan side facing rearward, that is, adjacent to the dust collection chamber 19, and the front and rear portions of the electric blower chamber 17 are made of rubber.
It is fixedly supported via 38 and 39. More specifically, the electric blower 31 is held by electric blower support ribs 40 formed on the inner surfaces of both body case members of the cleaner body 11, and is also supported by the partition wall 16 and the like. The dust collection chamber 19 is communicated with the intake port 34 and the exhaust port is communicated with the discharge port.

Further, a connector portion 41 for supplying power from a vehicle-mounted battery to the electric blower 31 is provided in the connector opening 23 adjacent to the front of the electric motor 32. This connector 41
As shown in FIG. 2, a board 42 fixedly held by both body case members, and a pair of connector terminals 45 and 46 penetrating the board 42 and fixed by nuts 43 and 44, respectively. Has become.

Also, the cleaner body is located in the switch opening 24.
An operation switch 47, which is located in the vicinity of the electric blower 31 and controls the electric blower 31, is fixedly held in the eleventh. The operation switch 47 is composed of, for example, a small rocker switch for a small current, and an operator 48 exposed outside the cleaner body 11.
And a pair of terminals 49 and 50 located inside the cleaner body 11.

A relay 51 is fixedly supported inside the cleaner body 11 at a position below the electric motor 32 behind the connector portion 41 by support ribs 52 formed on both body case members.

Further, in the cleaner body 11, a circuit board 53 is fixedly supported at a position near a lower portion of the operation switch 47 by a support rib 54 formed on both body case members.

Then, one end of the electric wire 56 is connected to the one + pole connector terminal 45 through a connecting tool 57, and the other end of the electric wire 56 is connected to the relay 51. Further, one end of the electric wires 58, 59 is connected to the other-pole connector terminal 46 via the connecting tool 60, and the other end of the one electric wire 58 is connected to the other carbon terminal 38 of the electric motor 32 by the connecting tool 61. The other end of the electric wire 59 is connected to the relay 51. Further, the relay 51 and one terminal 49 of the operation switch 47 are electrically connected via an electric wire 62. Further, the other terminal 50 of the operation switch 47 and the circuit board 53 are electrically connected via the electric wire 63. Further, the circuit board 53 and the relay 51 are electrically connected via an electric wire 64. Further, one end of an electric wire 65 is connected to the relay 51, and the other end of the electric wire is connected to one carbon terminal 37 of the electric motor 32 via a connector 66.

71 is a dust collecting filter, and this dust collecting filter 71 is detachably attached to the dust collecting chamber 19. The dust collecting filter 71 is provided with a breathable bag body 72 that is inserted and removed through the insertion and removal opening 22 of the cleaner body 11 and means such as adhesive or integral molding in the opening 73 of the bag body 72. It is composed of an annular filter packing 74 which is formed. The top of the filter packing 74 is
A flange portion 75 is formed on the outer edge portion of the insertion / removal opening 22 so as to be press-contacted from above so as to be freely detachable.

Further, in the position above the electric blower chamber 17 and below the concave portion 14 in the cleaner body 11, the electric blower 31 is provided.
A dust meter 76 for detecting the pressure between the fan side and the dust collecting filter 71 and displaying the amount of dust accumulated in the filter 71 is provided.

Reference numeral 81 denotes an inner lid body, and the inner lid body 81 is held in the recess 14 by both body case members so as to be rotatable by a predetermined angle with the left-right direction as a rotation axis direction. That is, the inner lid 81 is pivotally attached to the cleaner body 11 by a support shaft (not shown) at the front edge portion thereof, and is press-contacted to the flange portion 75 of the filter packing 74 from above so that the inner lid body 81 can be freely attached and detached. It is a thing. Also, an inner lid 81 for the cleaner body 11
As a locking means of the inner lid 81, a locking projection 82
Is formed so as to project downward, and a locking receiving portion 83 with which the locking projection 82 is releasably engaged is formed in the rear portion of the recess 14. A suction port 84 having a short cylindrical shape is formed in the center of the inner lid 81 so as to face the insertion / removal port 22 of the cleaner body 11.

A handle 86 is rotatably supported coaxially with the inner lid 81. The handle 86 is a foldable type and is housed on the inner lid 81.

91 is a suction port lid body, and this suction port lid body 91 is rotatably supported on the inner lid body 81 by a support shaft 92 located at a rear edge thereof so as to be rotatable by a predetermined angle with a left-right direction as a rotation axis direction.
The suction port 84 of the inner lid 81 is closed so as to be openable and closable. That is, on the lower surface side of the suction port lid body 91, a suction port packing 93 which is press-contacted to the upper end surface of the suction port 84 so as to be freely separable is attached by being held by a holding rib 94. Further, as a means for locking the suction port cover body 91 to the inner lid body 81, a clamp 95 is pivotally attached to the front portion of the suction port lid body 91, and the front portion of the inner lid body 81 has the above-mentioned structure. A lock receiving portion 96 is formed with which the clamp 95 is detachably engaged.

In addition, in a state where both the lids 81 and 91 are closed and the handle 86 is housed, the inclined front surface of the cleaner body 11 and the upper surfaces of the suction port lid 91, the handle 86 and the inner lid 81 are smoothly continuous. It is like this.

Next, the configuration of the electric circuit will be described with reference to FIG.

Between the + pole connector terminal 45 and the − pole connector terminal 46 of the connector portion 41 electrically connected to the vehicle-mounted battery, the operation switch 47, the coil 101 of the relay 51, and the npn-type transistor 102 as a switching element. Are connected in series in this order. A diode 103 is connected in parallel to the coil 101.

Further, a voltage detection circuit 104 composed of an IC or the like is connected between the operation switch 47 and the negative electrode connector terminal 46. This voltage detection circuit 104 has both connector terminals 45 and 46.
That is, the voltage between both electrodes of the connector section 41 is detected, and when this voltage is equal to or higher than a predetermined value, the output becomes HIGH, and when it is lower than the predetermined value, the output becomes LOW. The output terminal of the voltage detection circuit 104 is connected to the base which is the input terminal of the transistor 102. It should be noted that the predetermined value is set to a value that the engine of the automobile is applied by the voltage of the vehicle-mounted battery corresponding to the voltage between both electrodes of the connector portion 41.

Further, as a power supply circuit from the on-vehicle battery to the electric motor 32, the + pole connector terminal 45 is connected to one carbon terminal 37 of the electric motor 32 via the switch 105 of the relay 51, and the − pole connector terminal 46. Are electrically connected directly to the other carbon terminal 36. The switch 105
Is a closed state (ON) when the coil 101 is energized and an open state (OFF) when the coil 101 is not energized.

The transistor 102 and the voltage detection circuit 104
The various circuit elements forming the above are mounted on the circuit board 53.

 Next, the operation of the above embodiment will be described.

4 and 5 are schematic views of the interior of a vehicle,
Is a pair of front seats at the front, 112 is a rear seat at the rear, 113 is a floor tunnel, and 114 is a cover of a console box.

The cleaner body 11 is installed so as not to interfere as much as possible, for example, on the floor tunnel 113, on the rear side of the console box, and with the rear surface hitting the front surface of the seat of the rear seat 112. Also, one front seat 111
You may install it next to the. Further, the connector portion 41 is detachably connected to the connector portion at the tip of the external cord 115 extending rearward from the storage battery in the hood of the automobile, that is, the vehicle-mounted battery. The external cord 115 is passed under the seat 111 or near the floor tunnel 113.

At the time of cleaning the inside of the automobile, the suction port cover 91 is rotated to open it, and one end of a suction hose (not shown) is inserted into the opened suction port 84 for connection. Further, a suction inlet such as a nozzle is connected to the other end of this hose. Of course, the inner lid body 81 is closed, but the flange portion 75 of the filter packing 74 is covered by the inner lid body 81.
By being pressed against the outer edge of the insertion / removal port 22, the airtightness between the outside air and the inside of the dust collection chamber 19 is maintained.

When the operation switch 47 is operated to close (ON), the voltage detection circuit 104 detects the voltage between both electrodes of the connector section 41. If this voltage is a predetermined value or more, the voltage detection circuit 104 causes the transistor 102 to pass. Output to the base of HIGH
And the transistor 102 in series with the operation switch 47
Turns on. As a result, a current flows from the positive terminal of the on-vehicle battery to the negative terminal of the on-vehicle battery via the connector terminal 45, the operation switch 47 that is turned on, the coil 101 of the relay 5, the transistor 102, and the connector terminal 46. Therefore, the switch 105 of the relay 51 is turned on, and the connector section 4
The power supply circuit between 1 and the motor 32 is closed,
Current flows from the pole to the negative pole of the on-vehicle battery through the connector terminal 45, the switch 105, the electric motor 32, and the connector terminal 46. In this way, the voltage of the vehicle-mounted battery is applied to the electric motor 32, and the electric power is supplied to the electric motor 32.

Then, the fan is rotationally driven by the electric motor 32 that is operating. Due to the rotation of the fan, dust is sucked into the suction port body from the outside together with the suction wind, is guided into the dust collecting chamber 19 of the cleaner body 11 via the hose, and is trapped in the dust collecting filter 71. Further, the air filtered by the dust collecting filter 71 passes through the lattice plate 18 and the rectifying space 21 and is then taken into the intake port.
After being sucked into the electric blower 31 from 34 and discharged from the discharge port of the electric blower 31, it is further discharged from the discharge port of the cleaner body 11 to the outside.

If necessary, the handle 86 that has been turned upright can be gripped to hold the cleaner body 11 by hand for cleaning.

After cleaning, operate the operation switch 47 to turn it off.
Then, the coil 101 of the relay 51 inserted between the connector portion 41 and the operation switch 47 is de-energized, so that the switch 105 of the relay 51 is turned off, and the electric power to the electric motor 32 is cut off. 31 stops.

If necessary, the hose is removed from the suction port 84 and removed, and the suction port cover 91 is rotated to close it. In this state, the suction port 84 is closed by the suction port packing 93 of the suction port lid body 91, so that the dust accumulated in the dust collecting filter 71 is prevented from jumping out due to vibrations during traveling of the automobile. Note that the hose may be left connected to the suction port 84, but in this case, the suction port 84
Dust will not leak out of it. However, the suction lid 91
It's better to close it.

Further, even when the operation switch 47 is turned on, if the voltage of the on-vehicle battery becomes low and the voltage between both electrodes of the connector section 41 becomes lower than a predetermined value, the electric blower 31 stops.
That is, since the output from the voltage detection circuit 104 to the base of the transistor 102 becomes LOW, the transistor 102 is turned off and the coil 101 is de-energized, which turns off the switch 105. The electric power to the electric motor 32 is cut off, and the electric blower 31 automatically stops.

In this way, forgetting to turn off the operation switch 47, the electric blower
Even if the 31 is left in an operating state,
The voltage of the on-vehicle battery is prevented from dropping below a limit value at which the engine of the vehicle does not run over, and over-discharge of the on-vehicle battery is prevented. Therefore, cleaning does not adversely affect the on-vehicle battery. Further, particularly when the electric blower 31 is stopped during use as described above, the user can clearly know that the voltage of the on-vehicle battery has dropped, and take appropriate measures such as charging the on-vehicle battery. You can take it immediately.

When the dust is collected in the dust collecting filter 71 to some extent, the inner lid 81 is rotated and opened, the dust collecting filter 71 is removed from the dust collecting chamber 19, and the dust inside is discarded. Then, after reattaching the dust collecting filter 71, the inner lid 81 is closed again.

According to the above configuration, outside the power supply circuit to the electric blower 31,
Since the operation switch 47 for manually starting and stopping the electric blower 31 is provided, the electric blower 31 has high power and the driving current of the electric blower 32 is, for example, 30 A.
Even if only to some extent, it is not necessary to pass a large current through the operation switch 47, and therefore, as the operation switch 47, it is possible to use a small switch for small current that is general and inexpensive in the market. Therefore, the cleaner body
It is also possible to prevent the designability of the cleaner body 11 from being impaired by the operation switch 47 that has to be located on the outer surface portion such as 11.

The power supply circuit to the electric blower 31 is the switch of the relay 51.
Although the relay 51 is opened and closed by 105, the relay 51 has generality in the market and is inexpensive, even if the allowable current of the switch 105 is about 40 A, and it is easy to assemble a control circuit, which is advantageous in manufacturing. Moreover, since the relay 51 is built in the cleaner body 11, it does not adversely affect the external appearance and design.

In this way, it is possible to provide an inexpensive electric vacuum cleaner for automobiles having a high suction work rate and a good design. Further, the components arranged on the outer surface of the cleaner main body 11 hinder the downsizing of the cleaner main body 11 rather than the components built in the cleaner main body 11, so that a compact electric vacuum cleaner can be obtained.

Next, another embodiment of the present invention will be described with reference to FIG.

In this embodiment, a voltage detection circuit 10 similar to the previous embodiment is used.
A timer circuit 106 and an AND circuit 107, which is a logic circuit, are connected in parallel to 4. The output of the timer circuit 106 is HIGH after a voltage is applied to itself, that is, within a predetermined time after the operation switch 47 is turned ON, and thereafter the output is LOW. The predetermined time, that is, the timer time is usually set to 5 to 10 minutes. The output end of the voltage detection circuit 104 and the output end of the timer circuit 106 are connected to the AND gate.
This AND circuit 107 is connected to both input terminals of the circuit 107.
The output terminal of the npn-type transistor 102 is the same as that of the previous embodiment.
Connected to the base of.

Then, if the voltage between both electrodes of the connector portion 41 is equal to or more than a predetermined value within the timer time from turning on the operation switch 47,
Since the output of the voltage detection circuit 104 and the output of the timer circuit 106 are both HIGH, an AND of the logical product of these two outputs is output.
The output from the circuit 107 to the transistor 102 is HIGH,
This transistor 102 is turned on. Therefore, the electric blower 31 operates in the same manner as in the previous embodiment.

On the other hand, if more than the timer time elapses after the operation switch 47 is turned on, or if the voltage between the electrodes of the connector section 41 becomes lower than a predetermined value, then at least one of the output of the voltage detection circuit 104 and the output of the timer circuit 106. Either one is L
Since it becomes OW, the output from the AND circuit 107 to the transistor 102 becomes LOW and this transistor 102 becomes OFF. As a result, the switch 105 of the relay 51 is turned off, the power supply from the on-vehicle battery to the electric motor 32 is cut off, and the electric blower 31
Stops automatically.

Therefore, not only can the over-discharge of the on-vehicle battery be prevented as in the previous embodiment, but also when the door of the vehicle is accidentally closed during use and the electric blower 31 is left in the operating state. Since the operation of the electric blower 31 is automatically terminated at least after the elapse of the timer time, it is possible to prevent wasteful power consumption and it is safe. That is, overheating of the electric blower 31 due to continuous operation for a long time can be prevented, and deformation of the cleaner body 11 due to heat, smoking, ignition, etc. can be prevented.

In the voltage detection circuit and the timer circuit, HIGH and LOW of the outputs corresponding to the conditions to be inspected may be reversed from those in the above embodiment, and the AND circuit 107 may be replaced with the NOR circuit. Furthermore, while replacing the AND circuit 107 with a NAND circuit,
The npn-type transistor 102 may be replaced with a pnp-type transistor.

〔The invention's effect〕

 According to the present invention, the following effects can be obtained.

According to another aspect of the present invention, there is provided an electric vacuum cleaner for a vehicle having a connector part for electrical connection to a vehicle-mounted battery and a switch inserted in a power supply circuit between the electric blower and a coil for closing the switch when energized. A relay, an operation switch inserted between the connector section and the coil, a voltage detection circuit for detecting a voltage between both electrodes of the connector section, and a series connection with the operation switch and connected to the voltage detection circuit to keep the voltage at a predetermined level. Since it is equipped with a switching element that closes only when the value is greater than or equal to the value, it is possible to automatically cut off the power supply to the electric blower before the on-vehicle battery is over-discharged until the vehicle engine runs out. It is possible to prevent the battery-powered cleaning from adversely affecting the on-vehicle battery. In addition, even if the electric blower has high power and a large current flows, there is an operation switch outside the power supply circuit to the electric blower, so this operation switch that must be located on the outer surface of the cleaner body etc. A small and inexpensive switch for small current can be used, while a relay having a switch that opens and closes the power supply circuit is built in the cleaner body, and one for large current is generally used. It is possible to provide a compact and inexpensive electric vacuum cleaner for automobiles, which has a high suction work rate, good design, and is compact.

Further, in the electric vacuum cleaner according to claim 2, a timer circuit is added, and the output ends of the timer circuit and the voltage detection circuit are connected to the input end of the switching element via a logic circuit,
Since this switching element is set to the closed state only within a predetermined time after the closing of the operation switch and when the voltage between the electrodes of the connector section is equal to or more than the predetermined value, not only can the over-discharge of the on-vehicle battery be prevented. Even if you forget to turn off the operation switch and leave it for a while, the electric blower automatically stops after a predetermined time, preventing unnecessary power consumption and overheating of this electric blower due to excessive continuous operation of the electric blower. Therefore, the cleaner body can be prevented from being deformed or ignited by heat, which is safe.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an electric vacuum cleaner for an automobile according to the present invention, FIG. 2 is an actual wiring diagram of the same as above, FIG. 3 is a vertical sectional view of the main body of the same as above, and FIG. FIG. 5 is a schematic plan view in a state of being installed in the apparatus, FIG. 5 is a schematic side view of the same as above, and FIG. 6 is a circuit diagram showing another embodiment of the present invention. 11 …… Vacuum cleaner body, 19 …… Dust collection chamber, 31 …… Electric blower,
41 ...... connector part, 47 ... operation switch, 51 ... relay, 101 ... relay coil, 102 ... npn type transistor as a switching element, 104 ... voltage detection circuit,
105 …… Relay switch, 106 …… Timer circuit, 107…
... AND circuit that is a logic circuit.

Claims (2)

[Claims] Claim: What is claimed is: 1. A cleaner main body having a dust collecting chamber formed therein, an electric blower built in the cleaner main body so as to communicate with the dust collecting chamber, and electrically connected to the electric blower and an on-vehicle battery. A connector section that is built in the cleaner body, a switch that is inserted into the power supply circuit of the connector section and the electric blower, and a coil that closes the switch when the power is turned on, and the connector section and An operation switch inserted in the circuit between the coils of the relay, a voltage detection circuit that detects a voltage between both electrodes of the connector section and outputs an output according to this voltage, and is connected in series with the operation switch and A voltage detecting circuit and a switching element that is connected to the input terminal and is closed only when the voltage between both electrodes of the connector section is a predetermined value or more. Vacuum cleaner for an automobile to be. 2. A timer circuit, the output of which changes after a lapse of a predetermined time from the closing of the operation switch, is added, and the output end of the timer circuit and the output end of the voltage detection circuit are connected to the input end of the switching element via a logic circuit. 2. The automotive device according to claim 1, wherein the switching element is connected and the switching element is closed only within a predetermined time after the operation switch is closed and when the voltage between both electrodes of the connector portion is a predetermined value or more. Vacuum cleaner.