JPH0131155Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a safety valve device for a vacuum cleaner.

[Prior Art] Generally, in vacuum cleaners, the air passage on the suction side of the electric blower is closed due to clogging of the dust collection filter or other causes, and the air pressure on the suction side of the electric blower becomes a constant negative pressure. A safety valve device is installed that allows outside air to leak into the air passage on the suction side when the temperature reaches this temperature, thereby preventing the temperature of the electric blower from rising.

Conventionally, in such a safety valve device, as shown in FIG. 6, one end of a cylinder 31 is provided with a suction hole 32 that communicates with the outside air, and the other end is provided with a hole that communicates with the suction side of an electric blower. 33 is provided, and a suction valve 34 is arranged inside. This suction valve 3
A support part 35 is provided on the outside of the cylinder 31 to slidably support the suction valve 34 by contacting the inner wall of the cylinder 31, and is always biased by a spring body 36 in a direction to close the suction hole 32. There is.

Therefore, when the air pressure on the suction side of the electric blower becomes a constant negative pressure, the suction valve 34 slides along the inner wall of the cylinder 31 against the bias of the spring body 36.

At this time, since a gap is provided between the cylinder 31 and the suction valve 34 by the support part 35, the outside air introduced from the suction hole 32 is transferred between the cylinder 31 and the suction valve 34 as shown by the arrow. The air passes through the interior of the cylinder 31 through the gap, is exhausted from the hole 33, and leaks to the intake side of the electric blower.

Further, as shown in FIG. 7, a suction hole 42 communicating with the outside air is provided on the side of the cylinder 41.
A hole 43 communicating with the suction side of the electric blower is provided at the end. On the other hand, a suction valve 44 which is always biased in a direction to close the suction hole 42 by a spring body 46 is disposed inside the cylinder 41, and a hole corresponding to the hole 43 is provided on the side of the suction valve 44. 45 are provided.

Therefore, when the suction side of the electric blower reaches a certain negative pressure, the suction valve 44 is opened by the spring body 46 in the same way as above.
When the suction hole 43 and the hole 45 of the suction valve 44 communicate with each other by sliding along the inner wall of the cylinder 41 against the bias of the cylinder 41, the outside air introduced from the suction hole 43 of the cylinder 41 is As shown, the hole 4 passes through the inside of the cylinder 41 from the hole 45 of the suction valve 44
3 and leaks to the suction side of the electric blower.

[Problems to be solved by the invention] With the above configuration, in the former type, since the outside air passes through the gap between the cylinder 31 and the suction valve 34, the support part 35 of the suction valve 34 is There was a problem in that the suction valve 34 did not slide smoothly due to dust adhering to the vicinity, and the opening and closing timing of the suction valve 34 became irregular.

On the other hand, in the latter type, the hole 4 of the suction valve 44
5 and the suction hole 42 of the cylinder 41 is required, but since the suction valve 45 and the cylinder 41 are in surface contact, the friction between them is large, so the suction valve 44 cannot slide. There were problems such as the opening and closing timing of the safety valve device being irregular.

Therefore, in order to make the sliding movement of the suction valve 45 smooth, it is better to have a wide gap between the suction valve 44 and the cylinder 41, but if it is too wide, the gap between the cylinder 41 and the suction valve 45 will also be left when the safety valve device is closed. There were problems such as the possibility of outside air leaking into the suction side of the electric blower, making it difficult to design and manufacture a safety valve device.

[Means for solving the problem] This invention consists of a safety valve device consisting of a cylinder and a hollow suction valve, an opening communicating with the suction side of the electric blower at one end of the cylinder, and an opening communicating with the suction side of the electric blower at the other end. is provided with a suction port that communicates with the outside of the main body case, while the suction valve, which is slidably disposed inside the cylinder and is biased by a spring body in the direction of closing the suction port, has a suction port at its tip. A plurality of inlet ports for introducing outside air from the intake port of the cylinder into the inside of the suction valve are provided at a plurality of locations facing each other in the diametrical direction, and an outflow port is provided at the end portion for exhausting the outside air to the opening of the cylinder, A plurality of disc-shaped support parts are provided on the outer circumferential wall at positions spaced apart in the axial direction between the inlet port part and the outlet part that support the suction valve by slidingly contacting the inner wall of the cylinder. The outer wall of the tip of the cylinder and the inner wall of the tip of the cylinder,
By forming each part in a tapered shape that faces each other, outside air does not pass through the sliding part between the cylinder and the suction valve, and the opening and closing operation of the safety valve device is smooth. The object of the present invention is to provide a safety valve device for a vacuum cleaner.

[Operation] When the negative pressure on the suction side of the electric blower becomes large, the suction valve slides along the inner wall of the cylinder toward the opening against the bias of the spring body, and the tip of the cylinder and suction valve slides. A gap is formed between the parts. Then, outside air is introduced into the cylinder from the suction port, this outside air is further introduced into the interior of the suction valve via the inlet port of the suction valve, and is exhausted from the outflow port to the opening of the cylinder. At this time, since the inlet ports are provided in multiple locations facing each other in the diametrical direction,
When outside air is introduced from the inlet, the suction valve does not deviate within the cylinder, allowing smooth sliding movement.

Furthermore, since the plurality of supporting parts provided on the outer circumferential wall of the cylinder are formed in a disc shape with a sealing function, the gap in the axial direction between the cylinder and the suction valve is labyrinth-sealed by the supporting parts. Therefore, all the outside air is introduced into the suction valve from the inlet, and there is no air path for the outside air containing dust to pass through the sliding part between the suction valve and the cylinder, so the sliding part will become dirty. Smooth sliding motion can be obtained without any friction.

[Example] An example of this invention will be described in detail based on FIGS. 1 to 5.

In FIGS. 1 to 3, reference numeral 1 denotes a main body case of a vacuum cleaner, in which an electric blower 2 is built and an air passage 3 communicating with the suction side of the electric blower 2 is formed. A safety valve device 4 is disposed in this air passage 3.

The safety valve device 4 is composed of a cylinder 5 and a suction valve 6, as shown in FIG. The tip of the cylinder 5 is provided with a suction port 7 that communicates with the outside of the main body case 1 and sucks in outside air, and the end of the cylinder 5 communicates with the suction side of the electric blower 2 via the air passage 3. It is connected to the air passage 3 via a rubber connecting part 9. The inner wall of the tip end of the cylinder 5 is formed into a tapered shape.

As shown in FIGS. 3 and 4, inlet portions 10 for introducing outside air from the suction port 7 of the cylinder 5 into the interior of the suction valve 6 are located on the side of the suction valve 6 and are positioned diametrically opposite each other. There are multiple locations,
An outflow port 11 is provided at the end, and the outside air sucked in from the suction port 7 of the cylinder 5 passes from the inflow port 10 through the inside of the suction valve 6 as shown by arrow Y. The air is exhausted from the outlet 11 and is configured to leak to the suction side of the electric blower 2 via the opening 8 of the cylinder 5, the connecting portion 9, and the air passage 3. On the outside of the suction valve 6, there are support parts 12, 12a between the inlet port part 10 and the outlet part 11, which slideably contact the inner wall of the cylinder 5 and accurately support the suction valve 6 within the cylinder 5. There are multiple locations spaced apart in the axial direction.

The support portions 12 and 12a are formed into a disk shape that abuts against the inner wall of the cylinder 5.

Therefore, the gap in the axial direction between the cylinder 5 and the suction valve 6 is labyrinth-sealed by the plurality of supporting parts 12 and 12a, so that all the outside air is introduced into the inside of the suction valve 6 from the inlet part 10. The sliding portions 5a and 6a between the cylinder 5 and the suction valve 6 are configured so that no air passage for outside air is formed therein.

The outer wall of the tip of the suction valve 6 that faces the inner wall of the tip of the cylinder 5 is tapered to correspond to the shape of the inner wall of the tip of the cylinder 5. The safety valve device 4 is configured to open and close when the tip outer wall is simply attached and detached, as shown by arrow x.

Note that similar effects can be obtained even if the support portion 12a is formed with a rib along the axial direction of the cylinder 5.

Reference numeral 13 denotes a spring body, one end of which is fixed to a stopper 14 having a cross-shaped cross section provided on the connecting portion 9, as shown in FIG. It is biased in the direction of

15 is a rear wheel, 16 is a dust collection side case, 17 is a clamp that detachably locks the main body case 1 and the dust collection side case 16, and 18 is a caster.

Next, the operation will be explained.

If the dust collection bag (not shown) housed in the dust collection side case 16 becomes clogged while using the vacuum cleaner, or if the outside air decreases due to other reasons, the suction side of the electric blower 2 Air pressure (negative pressure) becomes abnormally high. When this negative pressure reaches a certain value, the air pressure near the end of the suction valve 6 decreases via the connecting portion 9, so that the suction valve 6 resists the bias of the spring body 13 and presses against the inner wall of the cylinder 5. A gap 5b is formed between the cylinder 5 and the suction valve 6 at their distal ends. Then, outside air is introduced into the cylinder 5 from the suction port 7, and as shown by arrow Y, the outside air is introduced into the interior of the suction valve 6 from the gap 5b through the inflow port 10 of the suction valve 6. This outside air is exhausted from the outlet portion 11 to the opening 8 of the cylinder 5, passes through the connecting portion 9 and the air passage 3, and is leaked to the suction side of the electric blower 2.

At this time, since the support parts 12 and 12a are provided in plurality at positions spaced apart in the axial direction and are formed in a disc shape, the cylinder 5 and the suction valve 6
Since the axial gap between the cylinder 5 and the cylinder 5 is labyrinth-sealed by the supporting parts 12 and 12a, all the outside air is introduced into the suction valve 6 from the inlet part 10, and the sliding gap between the suction valve 6 and the cylinder 5 is moving part 5
Since no air passage through which outside air containing dust passes is formed in a, 6a, the sliding parts 5a, 6a are not contaminated, and smooth sliding operation can be obtained.

Furthermore, since the inlet portions 10 are provided at a plurality of locations facing each other in the diametrical direction of the cylinder 5, the outside air flows from the inlet portions 10 into the suction valve 6 on average, so that the suction valve 6 is Smooth sliding motion can be obtained without deviation within the cylinder 5.

Further, since the outer wall of the tip of the suction valve 6 and the inner wall of the tip of the cylinder 5 are tapered to face each other, the cylinder 5 and the suction valve 6
There is no sliding part at the tip of the suction valve 6, and the suction port 7 is opened and closed simply by being attached to and detached from the cylinder 5, as shown by the arrow x, so the opening and closing operations of the suction valve 6 are smooth. .

Further, the stopper 14 is connected to the outlet portion 1 of the suction valve 6.
It secures an air path for the outside air exhausted from the spring body 1 and maintains the position of the spring body 13.

Next, when the negative pressure on the suction side of the electric blower 2 reaches a predetermined value, the suction valve 6 is biased by the spring body 13 to close the suction port 7.

[Effect of the invention] This invention uses a hollow suction valve and a cylinder to create a safety valve device that connects the air passage on the suction side of the electric blower to the outside air when the negative pressure on the suction side of the electric blower reaches a certain value. At the same time, one end of the cylinder is provided with an opening that communicates with the suction side of the electric blower, and the other end is provided with a suction port that communicates with the outside of the main body case. At the tip of the suction valve, which is freely arranged, there are multiple inlet ports that introduce outside air from the cylinder's suction port into the interior, diametrically opposed to each other, and at the end of the cylinder. An outflow port for exhausting air is provided at the opening, and a plurality of disc-shaped supports that slide against the inner wall of the cylinder and support the suction valve are provided on the outer peripheral wall in the axial direction between the inflow port and the outflow port. The outer wall of the tip of the suction valve and the inner wall of the tip of the cylinder are tapered to face each other, so that the gap in the axial direction between the cylinder and the suction valve is labyrinth-sealed by the support. Since there is no outside air passage formed in the sliding portion between the suction valve and the cylinder, the sliding portion will not be contaminated by dust or the like. Therefore, the opening/closing operation of the safety valve device becomes smooth and the opening/closing timing becomes accurate.

Furthermore, since the inlet ports provided on the suction valve are provided in multiple locations facing each other in the diametrical direction, the suction valve will not be deviated within the cylinder, so there will be no seal leakage. Smooth sliding action can be obtained.

Furthermore, since the inner wall at the tip of the cylinder and the outer wall at the tip of the suction valve are tapered to face each other, there is no sliding part at the tip of the cylinder and the suction valve, and the suction valve simply Since the suction port is opened and closed while attached to and removed from the cylinder, the opening and closing operations of the suction valve become smooth.

[Brief explanation of the drawing]

Figures 1 to 5 show examples of this invention.
The figure is a sectional view of the main part of the safety valve device, and Figure 4 is the suction valve 6.
FIG. 5 is a perspective view of the stopper 14, and FIGS. 6 to 7 are sectional views of main parts showing a conventional example. 1... Main body case, 2... Electric blower, 3...
Air passage on the suction side of the electric blower 2, 4... safety valve device, 5... cylinder, 6... suction valve, 7... suction port of cylinder 5, 8... opening of cylinder 5, 10... suction An inlet portion of the valve 6, 11... an outlet portion of the suction valve 6, 12... a support portion of the suction valve 6,
13...Spring body.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body case containing an electric blower is provided, and when the air pressure on the suction side of the electric blower reaches a certain negative pressure, the air passage on the suction side of the electric blower is communicated with the outside air. In a safety valve device for a vacuum cleaner equipped with a safety valve device, the safety valve device consists of a cylinder and a hollow suction valve, an opening communicating with the suction side of the electric blower is provided at one end of the cylinder, and an opening communicating with the suction side of the electric blower is provided at the other end. is provided with a suction port that communicates with the outside of the main body case, and is slidably disposed inside the cylinder;
An inflow port for introducing outside air from the suction port of the cylinder into the suction valve is diametrically connected to the tip of the suction valve, which is always biased by a spring in the direction of closing the suction port. A plurality of locations are provided facing each other, an outflow port is provided at the end portion for exhausting the outside air to the opening of the cylinder, and an inflow port is provided on the outer peripheral wall to slide against the inner wall of the cylinder to support the suction valve. A plurality of disc-shaped supports are provided at positions spaced apart in the axial direction from the outflow port, and the outer wall of the tip end of the suction valve and the inner wall of the tip end of the cylinder are each provided with a tapered shape facing each other. A safety valve device for a vacuum cleaner, characterized in that it is formed as follows.