JPH0556704U - Safety device in vacuum cleaner - Google Patents

Abstract

(57) [Abstract] [Purpose] A vacuum cleaner used at a gas station, etc. Even if a combustible gas such as gasoline vapor is sucked into the vacuum cleaner, the combustible gas is released into the atmosphere and diluted before being vacuumed. Stop the operation of the vacuum cleaner to prevent combustible gas from remaining in the vacuum cleaner and prevent the risk of ignition. [Structure] Nozzle holder 2 in which a suction nozzle 21 connected to the tip of a suction system V is detachably housed in a cleaner body 1.
5, the suction nozzle 21 of the nozzle holder 25,
Control means 2 for stopping and controlling the operation of the driving motor 9 of the vacuum cleaner after a certain time has passed immediately after being housed in the nozzle holder 25.
8 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a safety device for a vacuum cleaner used in a place where flammable gas may be emitted such as a gas station.

[0002]

[Prior Art]

 Conventionally, a gas station is equipped with a vacuum cleaner to clean the passenger compartment of a vehicle that has been refueled.However, this vacuum cleaner is operated by turning on the start switch and stopping it like the general vacuum cleaner. It is configured to stop instantly when the switch is turned off.

[0003]

[Problems to be solved by the device]

 However, at gas stations, flammable gas diffuses into the air during refueling of gasoline, etc., and if the vacuum sweeper is stopped while this gas still remains around the gas station, flammable gas Remained in the dust collection tank, blower, and suction system of the vacuum cleaner, and there was the problem that this could ignite.

The present invention has been made in view of such circumstances, and the vacuum cleaner is designed to keep the combustible gas sucked into the vacuum cleaner so that the vacuum cleaner can continue to operate for a certain period of time after completion of the cleaning work. It is an object of the present invention to provide a safety device for a vacuum cleaner that can prevent the risk of ignition by being released and diluted in the atmosphere.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention is characterized in that a cleaner body, a dust collecting tank provided in the cleaner body, and an intake port for keeping the inside of the dust collecting tank at a negative pressure. In addition, a vacuum cleaner equipped with a blower whose exhaust port communicates with the atmosphere, a prime mover for driving this blower, and a suction system in which the base end communicates with the dust collection tank and a suction nozzle is connected to the outer end. In the machine, a nozzle holder for housing the suction nozzle is provided in the cleaner body, and the operation of the prime mover is controlled to stop after a certain time has passed immediately after the suction nozzle is housed in the nozzle holder. There is a control means.

[0006]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a vertical sectional front view of essential parts of a vacuum cleaner equipped with the device of the present invention, FIG. 2 is a partially cutaway side view taken along line 2-2 of FIG. 1, and FIG. 3 is a part of a suction system. FIG. 4 is an enlarged sectional view of FIG. 4, and FIG. 4 is an air system diagram showing the flow of suction air in the suction system.

In FIGS. 1 and 2, a box-shaped cleaner body 1 is installed at an appropriate place of a gas station. The main body 1 of the vacuum cleaner is provided with upper and lower lids 2 and 3 for opening and closing a front door and a leg portion 4 thereof is fixed to the ground with anchor bolts 5.

A dust collection tank 6 is accommodated in the lower portion of the cleaner body 1, and a filter 7 is stretched in the tank 6, whereby the dust collection tank 6 has a lower dust collection chamber. It is divided into 6 ₁ and an upper air chamber 6 ₂ .

A blower 8 and a prime mover 9 for driving the blower 8 are provided in an upper portion of the cleaner body 1. The intake port 8 ₁ of the blower 8 is communicated with the air chamber 6 ₂ of the dust collecting tank 6 through the suction pipe 12, and the exhaust port 8 ₂ thereof is opened to the atmosphere.

Further, a control box 10 is provided near the front of the upper part of the cleaner body 1, and a start switch 11 is provided on the front of the control box 10.

The cleaner body 1 is provided with a suction system V for sucking air into the dust collecting tank 6. The structure of the suction system V will be described below. As shown in FIG. 3, a bearing member 13 provided with a negative pressure air extraction pipe 14 is rotatably supported on the upper wall of the cleaner body 1 about a vertical axis. The lower end of the negative pressure air take-out pipe 14 that opens inside the cleaner body 1 is provided with a flexible negative pressure hose 15 and a dust collection chamber 6 of the dust collection tank 6.₁The upper end of the negative pressure air extraction pipe 14 that opens to the outside of the cleaner body 1 is connected to a boom 17 via a flexible connection hose 16. The connection portion between the negative pressure air extraction pipe 14 and the boom 17 is covered by a swivel cylinder 18 provided on the bearing member 13. This swivel cylinder 18 has a base portion 18₁And a tip portion 18 pivotally supported therewith by a pivot 19. ₂ It consists of the tip part 18₂Can be raised toward the front of the cleaner body 1 together with the boom 17. An upper end of the boom 17 is curved in an elbow shape, a flexible air hose 20 is connected to an open end of the boom 17, and a suction nozzle 21 is detachably connected to a free end of the air hose 20.

A nozzle holder 25 is fixed to the outer surface of one side wall of the cleaner body 1 by inclining forward and upward toward the front surface of the cleaner body 1, and the nozzle insertion port 26 is provided at the upper end of the nozzle holder 25. Is opened, and the air suction port 27 is opened at the lower end thereof. Then, as shown in FIG. 2, the suction nozzle 21 can be detachably accommodated in the nozzle holder 25 through the insertion port 26 thereof.

A normally-closed type limit switch 28 having a timer is provided in the nozzle holder 25, and the limit switch 28 is connected to the drive circuit of the prime mover 9. The limit switch 28 is turned on when the suction nozzle 21 is removed from the nozzle holder 25, and when the suction nozzle 21 is stored in the nozzle holder 25 as shown in FIG. It turns off after a certain period of time.

Reference numeral 29 in the figure denotes an emergency stop switch.

Next, the operation of the first embodiment shown in FIGS. 1 to 4 will be described.

At the gas station, in order to operate the vacuum cleaner to clean the interior of the vehicle, the suction nozzle 21 is taken out from the nozzle holder 25 and the normally closed limit switch 28 is turned on. When the start switch 11 is turned on, the prime mover 9 is started and the blower 8 is driven. As a result, the air in the dust collection tank 6 is sucked. As a result, the inside of the tank 6 is in a negative pressure state, and this negative pressure acts on the suction nozzle 21 through the negative pressure hose 15, the boom 17 and the air hose 20, so that the suction nozzle 21 removes dust in the vehicle interior or the like. Can be suctioned and cleaned. The dust sucked into the suction nozzle 21 together with the air is collected and accumulated in the dust collecting chamber 6 ₁ of the dust collecting tank 6. Then, the air that has passed through the filter 7 is discharged from the blower 8 to the atmosphere through the exhaust port 8 ₂ .

When the suction nozzle 21 is inserted into the nozzle holder 25 and housed after the cleaning work is completed, the limit switch 28 detects this and the limit switch 28 is turned off after a lapse of a predetermined time to stop the operation of the prime mover 9. To do.

By the way, since the limit switch 28 is kept in the ON state until the timer times out after the suction nozzle 21 is housed, the prime mover 9 continues to operate during that time and the vacuum sweeper is in the operating state. Even if the combustible gas is sucked into the vacuum cleaner, the suction nozzle 21 sucks the clean air around the nozzle holder 25 by the continuous continuous operation of the vacuum cleaner. Therefore, the combustible gas collects the dust collection tank 6, the blower 8, and the suction system. It is released into the atmosphere without remaining in V etc. and is diluted to prevent the risk of ignition and explosion.

A second embodiment of the present invention is shown in FIGS. In this embodiment, the same members as those in the first embodiment are designated by the same reference numerals. FIG. 5 is a front view of a vacuum cleaner equipped with the device of the present invention, and FIG. 6 is an air system diagram showing the flow of suction air in the suction system.

In this embodiment, a pair of suction systems V, V are arranged side by side on the left and right of the cleaner body 1, and the structure of each suction system V is the same as that of the first embodiment. Detailed description is omitted.

A pair of nozzle holders 25, 25 are symmetrically provided on the outer surfaces of the left and right side walls of the cleaner body 1, and these nozzle holders 25, 25 have a suction nozzle 21, a suction nozzle 21 of the left and right suction systems V, V. 21 can be freely inserted and removed.

Thus, this second embodiment also has the same effect as that of the first embodiment.

In the first and second embodiments, the case where the vacuum cleaner equipped with the device of the present invention is installed in a gasoline stand has been described. However, this is a place where combustible gas is emitted, for example, another gas station. Of course, it can also be installed.

In addition to an electric motor, a hydraulic motor, an internal combustion engine, or the like can be used as the prime mover.

In addition to the limit switch, another switch such as a proximity switch may be used as the control means.

[0027]

[Effect of the device]

 As described above, according to the present invention, in the vacuum cleaner, the cleaner body is provided with the nozzle holder for storing the suction nozzle, and the nozzle holder is provided with a nozzle holder for a predetermined period of time immediately after the suction nozzle is stored. Since the control means for controlling the stop of operation is provided, even if the vacuum cleaner sucks in the combustible gas, it can be released to the atmosphere and diluted, and the risk of ignition can be prevented. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a first embodiment of the device of the present invention.

FIG. 2 is a partially cutaway side view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view of a part of the suction system.

FIG. 4 is an air system diagram showing the flow of suction air in the suction system.

FIG. 5 is a front view of a second embodiment of the device of the present invention.

FIG. 6 is an air system diagram showing the flow of suction air in the suction system.

[Explanation of symbols]

1 Vacuum cleaner body 6 Dust collection tank 8 Blower 8 ₁ Intake port 8 ₂ Exhaust port 9 Motor 21 Suction nozzle 25 Nozzle holder 28 Limit switch as control means V Suction system

Claims (2)

[Scope of utility model registration request] 1. A cleaner body (1) and a dust collecting tank (6) provided in the cleaner body (1).
In order to keep the inside of the dust collection tank (6) at a negative pressure, the intake port (8
A blower (8) in which ( ₁ ) is connected to the tank (6) and an exhaust port (8 ₂ ) is connected to the atmosphere, a prime mover (9) for driving the blower (8), and a base end of the dust collection unit. A vacuum cleaner having a suction system (V) communicating with a tank (6) and having a suction nozzle (21) connected to an outer end thereof, wherein the suction nozzle (21) is housed in the cleaner body (1). A nozzle holder (25) for controlling the operation of the prime mover (9) after a certain period of time has passed immediately after the suction nozzle (21) is housed in the nozzle holder (25). A safety device in a vacuum cleaner, characterized in that a control means (28) for controlling is provided. 2. A safety device in a vacuum cleaner according to claim 1, wherein said control means (28) is a limit switch equipped with a timer.