JPH03297430A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent surrounding dust caused by air through an air jetting opening from being scattered by providing a means which inspects a suck-in opening port having been separated from a floor, and a changeover valve which moves into a suck-in passage the flow of the air of an air outflow passage at the above inspection. CONSTITUTION:A flow passage changeover valve body 16 penetrates through a partition 17 partitioning an air suck-in passage 12 and an air outflow passage 14, and is retained between both so as to be displaceable. A spring 18 is for the purpose of energizing the valve body 16 in the direction of the bottom plate 19 of a suck-in tool 2, and a detection rod 20 provided at the valve body 16 penetrates the lower side wall plate 21 at the air suck-in passage 12 and a bottom plate 19, and its tip portion 20a is made to be projectable toward a floor surface part. When the suck-in tool 2 is lifted from the floor surface while a motor- driven suck-in device 8 is in motion, the valve body 16 descends on the lower side due to the reaction force of the spring 18, and a blocking portion 22 blocks an air outflow passage 14, and at the same time an opening/closing portion 23 opens the through-hole of the partition 17. Air delivered from the motor-driven suck-in device 8 does not jet out through an air jetting out port 10, but flows into the air suck-in passage 12 through the through-hole of the partition 17, and is to be returned to the motor-driven suck-in device 8.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a vacuum cleaner.

Conventional technology A typical vacuum cleaner uses an electric suction machine to draw in air from a suction port, passes the airflow through a filter, removes dust carried by the airflow, and removes the air that has passed through the filter. It is constructed so that all of the water is discharged to the outside.

By the way, some devices have a configuration in which a portion of the air after passing through the filter is returned to the intake port. In other words, by installing an air outlet near the air intake port and discharging all or part of the air that has passed through the filter from this outlet, dust adhering to the floor surface is lifted up before being released into the surrounding air. It is designed so that it can be inhaled together with the water. With this configuration, the dust collection effect can be further enhanced compared to the former one.

Problems to be Solved by the Invention However, the above configuration has the following problems. In other words, with the former configuration that uses only suction power, it is not possible to satisfactorily suck up dust mites and fine dust hidden in the depths of the hair of the carpet, that is, at the base of the carpet.

In addition, in the latter configuration, an air outlet is provided that faces the floor surface, and air is blown out from this air outlet while the electric suction machine is operating. If you lift the vacuum cleaner without stopping the operation and move the suction port (in the case of a type where the main body and suction device are separate, this is the suction device) from the floor, air will flow out from the air outlet. will blow out to the outside.

When the air blows outward in this way, it scatters any remaining dust on the floor around it.

The invention was made in view of the above problems, and in a structure in which an air outlet is provided facing the floor,
To provide a vacuum cleaner that does not scatter surrounding dust with air from an air outlet when a suction port is separated from a floor surface.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms a flow path so that when the suction port is in contact with the floor surface, the air flowing through the air outflow passage blows out from the jet port. A detection means for detecting that the mouth portion has left the floor surface and a flow path switching valve for switching the flow path so that the air flowing through the air outflow path is transferred from the middle to the air suction path are provided.

Effect With the above configuration, when the suction port is in contact with the floor surface, air will blow out from the outlet, and when the suction port is removed from the floor surface, even if it is an electric air suction device. Even if the unit continues to operate, the air that escapes from the air outflow passage will move to the air suction passage and return to the electric air suction device before being blown out from the nozzle, so air will be blown out from the nozzle. Things will go away.

Embodiments Hereinafter, embodiments of a vacuum cleaner according to the present invention will be described based on FIGS. 1, 2, and 3. FIG. 1 shows a schematic configuration of a vacuum cleaner in this embodiment. In Fig. 1, 1 is a vacuum cleaner body with a built-in electric air suction device, 2 is a floor suction device, 3 is a handle attached to the top of the vacuum cleaner body l, and 4 is a vacuum cleaner body 1 and a suction device 2. This is a connecting pipe installed between the The vacuum cleaner in this example is
The suction tool 2 is used by being moved back and forth on the floor by the user holding the handle 3 and moving the suction tool 2 back and forth while keeping it on the floor. 5 is the motor, 6 is the motor 5
This is a fan casing with a built-in fan that rotates by the electric suction device 8. 7 is a dust collection bag made of a filter material that does not allow dust to pass through. 9 is an air inlet, and 10 is an air outlet. 11 and 12 are air suction passages through which the air sucked by the electric suction device 8 passes, and 13, 14, and 15 are air outflow passages through which the air pumped by the electric suction device 8 passes. An air suction passage 12 and an air outflow passage 14 are formed in the suction tool 2, and the end of the air suction passage 12 serves as an air suction port 9, and the end of the air outflow passage 14 serves as an air outlet 10. A part of the air suction passage 11 and a part of the air outflow passage 13 pass through the connecting pipe 4. Also, the air outflow passage 15
is formed in the cleaner body 1 and guides the air pumped by the electric suction device 8 to the air outflow passage 13. With this configuration, by operating the electric suction device 8, external air is sucked in from the air suction port 9, passes through the dust collection bag 7 and the fan casing 6, and passes through each air outlet passage. It will blow out from the spout 10.

16 is a valve body provided in the suction tool 2 for switching the flow path. A through hole is formed in the partition wall 17 that partitions the air suction passage 12 and the air outflow passage 14, and the valve body 16 penetrates the partition wall 17 by this through hole, and the air suction passage 12
and the air outflow passage 14 so as to be displaceable.

18 is a spring for biasing the valve body 16 toward the bottom plate 19 of the suction tool 2. 20 is a detection rod provided on the valve body 16, and this detection rod 2o passes through the lower wall plate 21 and the bottom plate 19 of the air suction passage 12, and its tip 20a
can protrude toward the floor. FIG. 2 shows the suction device 2 in a lifted state, and FIG. 3 shows the suction device 2 in a state lowered onto the floor as in normal use. Since the valve body 16 is biased by the spring 18 as described above, when the suction tool 2 is lifted from the floor as shown in FIG. , and the detection rod 20 is in a largely protruding state.

On the other hand, when the suction tool 2 is lowered onto the floor as shown in FIG. 3, the detection rod 20 is pushed against the floor and the valve body 16 is raised.

In the valve body 16, reference numeral 22 represents a closing portion provided to open and close the air outflow passage 14, and 23 represents an opening/closing portion provided to open and close the through hole of the partition wall 17.

When the suction tool 2 is lifted from the floor as shown in FIG.
At the same time, the opening/closing part 23 opens the through hole of the partition wall 17. The incoming air passes through the through hole of the partition wall 17 and enters the air suction passage 1 without being blown out from the air outlet 10.
2, and directly returns to electric suction bag #8.

Further, as shown in FIG. 3, when the suction device 2 is lowered onto the floor, the valve body 16 is in an elevated state. In this state, the closing part 22 is retracted and air can flow through the air outflow passage 14, and at the same time the opening/closing part 23 is closed to the partition wall 1.
Close the through hole 7. When the suction tool 2 is lowered onto the floor in this way, the air sent from the electric suction device 8 will be ejected from the air outlet 10, and the ejection force will blow up dust on the floor. It can be absorbed well.

Effects of the Invention As described above, the present invention forms a flow path such that when the suction port is in contact with the floor surface, the air flowing through the air outflow passage blows out from the jet port, and the suction port is separated from the floor surface. By providing a detection means for detecting the air flow, and a flow path switching valve for switching the flow path so that the air flowing through the air outflow passage is transferred to the air suction passage from the middle according to the detection means, it is possible to place the suction port against the floor. In this state, air blows out from the nozzle, and the blowing force blows up dust on the floor, making it possible to suck it up well. When the suction port is removed from the floor, the flow path switching valve switches the air to the air suction path before blowing out from the jet port and returns to the electric air suction device. Even if the electric air suction device continues to operate, air will not blow out from the nozzle. Therefore, when the suction port is removed from the floor, there is no possibility of scattering surrounding dust. Moreover, since most of the air ejected from the electric suction device is sucked in again through the suction port, there is no possibility of scattering a large amount of fine dust to the outside.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the schematic configuration of the vacuum cleaner in this embodiment, Fig. 2 is a longitudinal cross-sectional view of the main part of the vacuum cleaner with the suction tool lifted, and Fig. 3 is a longitudinal cross-sectional view of the main part of the vacuum cleaner with the suction tool lifted. FIG. 2 is a vertical cross-sectional view of the main part of the suction device in a state where it is lowered onto the floor. 1: Vacuum cleaner body 2: Suction tool 3: Handle
4: Connecting pipe 5: Motor
6: Fan casing 7: Dust collection bag 9:
Air suction port 10: Air jet port 11.12: Air suction passage

Claims (1)

[Scope of Claims] An electric suction device; an air outlet and an air suction port formed in a suction portion that contacts a floor surface in normal use; an air suction passage for guiding the air to the electric suction device; and an air outflow passage for guiding the air pressurized from the electric suction device to the air outlet and ejecting it from the air outlet; and the electric suction device. a dust collection filter provided on the inlet side of the inlet; a detection means for detecting when the bottom of the inlet has left the floor surface; A flow path switching valve is provided, which forms a flow path so as to blow out from the jet port, and switches the flow path so that the air flowing through the air outflow path is transferred to the air suction path from the middle according to the detection means. vacuum cleaner.