JPS6319009Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety valve/indicator device for a vacuum cleaner, which has a function of preventing burnout of the vacuum cleaner fan motor and an indicator function of displaying the degree of clogging of the filter.

A vacuum cleaner fan motor using a commutator motor is cooled by clean air that is sucked in as dust-containing air from the suction port and filtered by a filter. If sufficient clean air for cooling cannot be obtained due to clogging or blockage of the suction port of a dust suction brush or crevice, the differential pressure will cause a The normally closed safety valve is opened to cool the motor. In addition, the clogging condition of the filter is easily confirmed from the outside using an indicator, so the user can understand the clogging condition of the filter by looking at this indicator and adjust the filter as appropriate. By removing dust, the dust suction capacity of the vacuum cleaner can be maintained constant at all times.

However, in conventional vacuum cleaners of this kind, the safety valve and indicator described above are built into the vacuum cleaner as completely independent mechanisms, which complicates the configuration and increases costs, and the indicator indicates the limit pressure. It is very difficult to adjust the two so that the safety valve opens exactly when the safety valve is opened, and errors between the two can cause various inconveniences.

On the other hand, in the dust collection meter for a vacuum cleaner disclosed in Japanese Utility Model Application Publication No. 48-57572, a piston corresponding to the above-mentioned indicator directly pushes an outside air intake valve corresponding to the above-mentioned safety valve to open it. Because of this configuration, the various problems mentioned above can be solved.

However, in the above-mentioned conventional dust collection meter, outside air is introduced by pushing outward an outside air intake valve that opens and closes a through hole in a bush provided at the end of a transparent tube using a valve operating rod connected to a piston. Because of the structure, the piston loses its balance due to the weight of the valve operating rod,
Its movement is unstable and errors tend to occur in the meter display, and the outside air intake valve that is pushed open to the outside of the transparent tube often comes into contact with the mounting bracket or the vacuum cleaner itself. There are various problems such as not being able to take in sufficient outside air because the vacuum cleaner is incomplete, or requiring more installation space than necessary to prevent the above-mentioned contact, making it extremely troublesome to install it into the vacuum cleaner. The dot was hot.

Therefore, the present invention was proposed in order to improve the above-mentioned problems, and its purpose is to enable the safety valve and the indicator to operate in relation to each other without error, and to ensure that the safety valve opens. The purpose of this invention is to provide a safety valve/indicator device for a vacuum cleaner that is devised so that it can be easily integrated into a vacuum cleaner. A cylindrical indicator body is provided in the machine, and one end is connected to the suction side of the fan, and the other end is connected to the outside air. An outer cylindrical valve body receiving a traction action is fitted into the outside air port side, an inner valve body is attached to the other end of the outer cylindrical valve body, and the traction spring is installed inside the outer cylindrical valve body. By fitting a slide valve that constantly closes the outside air intake hole of the inner valve body with a stronger elastic spring, the outer cylinder valve body expands the traction spring due to negative pressure caused by a clogged filter, etc. At the same time, the indicator moves to one end of the indicator body and displays the limit pressure, and at the same time, the sliding valve slides against the elastic spring, opening the outside air intake hole in the inner valve body and letting in air for motor cooling. It is configured to allow

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front sectional view showing an example of a vacuum cleaner equipped with a safety valve/indicator device according to the present invention. The inner bottom of the container is a bucket 2 in which collected dust is stored. Reference numeral 3 denotes a top lid body configured to be detachably attached to the upper opening of the cleaner main body 1, and 4 denotes a lever for hanging. Reference numeral 5 denotes a bag-shaped filter housed in the vacuum cleaner body 1, and the filter 5 is attached by sandwiching the upper edge opening between the bottom edge of the upper cover body 3 and the upper edge of the vacuum cleaner body 1; Further, its shape is maintained by a support rod 6 vertically provided on the bottom surface of the upper lid body 3. 7 is a suction port to which a dust suction hose (not shown) can be freely connected;
indicates a rectifier plate installed inside this suction port 7,
The dust-containing air sucked into the vacuum cleaner body 1 from the suction port 7 hits this rectifying plate 8 and flows downward toward the bucket 2, where relatively large debris is dropped into the bucket 2. It is designed to be sucked towards the film 5.

Next, reference numeral 9 denotes a partition plate attached to the bottom surface of the upper lid body 3, and a fan 11 that is operated to suck dust by a motor 10 is attached to the center of this plate 9. The clean air filtered by the filter 5 is sent from the filter chamber 5a through the hole 12a of the fan case 12 into the housing 3a of the top cover 3 which is partitioned by the partition plate 9, and then sent to the outside of the top cover 3. The air is discharged to the outside air through the exhaust port 3b opened on the side or through the gap provided between the top cover 3 and the cleaner body 1.

The safety/indicator device of the present invention used in the vacuum cleaner constructed as described above is incorporated into the housing 3a of the top cover 3 as shown in FIG. That is, in FIGS. 1 to 4, 20 is an indicator body attached to the ceiling side of the upper lid body 3;
This indicator body 2 has a cylindrical shape as a whole.
0 is fixed to the upper surface of the upper lid body 3, and the tip opening (lower end opening) of one end 20a hanging downward at a substantially right angle is located downstream of the filter 5 and on the suction side of the fan 11, specifically. The filter chamber 5a is
In addition, the other end 20b is opened upward to the outside air from the upper surface of the upper lid body 3, and a transparent portion 20c is formed so that the upper surface portion formed on the same plane as the upper surface of the upper lid body 3 can be seen from the outside. has been completed.

Inside the indicator body 20 configured in this way, an outer cylinder valve body 21, which is also formed in a cylindrical shape, is in a tight state, and stoppers 2 provided on both left and right sides are installed.
It is fitted so that it can slide freely within the range of 0A and 20B. The outer cylindrical valve body 21 has a plurality of valve holes 21b bored in an off-center portion of one end surface 21a provided on the one end 20a side of the indicator body 20,
Further, the other end side has an opening 21c toward the outside air, and the entire structure includes the inner wall on the other end 20b side of the indicator body 20 and the other end opening 21 of the outer cylinder valve body 21.
The indicator body 20 is constantly pulled in the direction of the other end 20b by the traction spring 22 stretched between the indicator body 1c and the filter 5 is not clogged to a predetermined set value, such as when the dust collector is stopped. or if the dust suction port is not closed, press the stopper 20B on the right side as shown in Figure 2.
It is stopped at the locked position. Reference numeral 23 denotes an inner valve body fixed to the inner opening 21c side of the outer cylinder valve body 21, and an outside air intake hole 2 is provided in the center surface of the inner valve body 23.
3a is bored. 24 is the outer cylinder valve body 21
A sliding valve fitted inside the valve groove 24a on the periphery...
This sliding valve 24, which has a notch, receives the pressing force of the elastic spring 25, which is stronger than the traction spring 22 and is interposed between the one end surface 21a of the outer cylinder valve body 21 and the sliding valve 24 shown in FIGS. 2 and 3. As such, the outside air intake hole 23a of the inner valve body 23 is always closed.

Incidentally, the scale 30 shown by imaginary lines in FIGS. 2 to 4 is the upper transparent part 20c of the indicator body 20 or the outer upper lid 3 of this transparent part 20c.
A mark (not shown) displayed on the outer cylinder valve body 21 or the upper surface of the outer cylinder valve body 21, which is displayed on the surface of the cylinder and can be seen through the transparent part 20c;
By turning off this scale 30, the clogging state of the filter 5 can be visually confirmed from the outside.More specifically, when the external cylinder valve body 21 reaches the limit pressure indicated by the scale 30, , the outside air intake hole 23a of the inner valve body 23 is configured to be open. Also, in Fig. 1, 40 is the motor 10.
This is a switch for use.

Since the present invention has the above-described configuration, when dust is sucked by rotating the fan 11, the dust adheres to the filter 5 and gradually causes clogging, and the pressure (negative pressure) at the suction port changes. do. When the negative pressure reaches the set value due to this clogging, the outer cylinder valve body 21 is sucked and moved to the left in the drawing while stretching the traction spring 22. The clogging state of the filter 5 can be easily confirmed by reading the indicator. Generally, when the indicator indicates that the clogging of the filter 5 reaches a predetermined limit as shown in FIG. 3, the upper lid 3 is usually opened to remove dust from the filter 5. If the filter 5 is completely clogged due to continued dust suction operation without performing this dust removal for some reason, or if the suction port of the brush attached to the tip of the vacuum cleaner or crevice etc. is blocked. , since the suction of clean air (cooling air) from the filter 5 side is zero, the motor 1
0 is heated and burnt out. However, in the present invention, when the filter 5 or the suction port is completely closed, the outer cylinder valve body 21 is locked to the left stopper 20A and its movement is stopped, and if the dust suction operation is continued as it is, This time, as shown in FIG. 4, the sliding valve 24 is suctioned and moved to the left in the drawing while compressing the elastic spring 25 to open the outside air intake hole 23a of the inner valve body 23, so that the outside air is transferred to the other end of the indicator body 20. 2
From the 0b side, enter the filter chamber 5 through the outside air intake hole 23a, the valve groove 24b, and the valve hole 21b as shown by the arrow in FIG.
This can prevent the motor 10 from burning out due to heating.

As described above, according to the safety valve/indicator device of the present invention, which is constructed by combining an indicator body, an outer cylinder valve body with an inner valve body, two springs, and a sliding valve, it is possible to detect the clogging state of the filter. It is possible to prevent motor burnout when the filter or suction port side is completely blocked, but this invention especially includes a safety valve device to prevent burnout and to check for filter clogging or suction port blockage. The indicator device is constructed by the above-mentioned outer cylindrical valve body and a sliding valve that slides inside the outer cylindrical valve body to open and close the outside air intake hole of the inner valve body. Because of the structure, the indicator function and outside air intake function can be performed accurately without being affected by other parts, and manufacturing and integration into the vacuum cleaner body are easy, which reduces costs. In addition, it has the advantage that the safety valve device and the indicator device can be operated in conjunction with each other without error, and its practical value is enormous.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an example of a vacuum cleaner incorporating the present invention, and Figs. 2, 3, and 4 are enlarged front sectional views showing main parts of the invention in the order of operation. . 1...Vacuum cleaner body, 2...Bucket, 3...Top lid, 5...Filter, 7...Suction port, 10...
Motor, 11... Fan, 20... Indicator body, 20a... One end, 20b... Other end, 20c
...transparent part, 21 ... outer cylinder valve body, 21a ... end face, 21b ... valve hole, 22 ... traction spring,
23...Inner valve body, 23a...Outside air intake hole, 24...
...Sliding valve, 24a... Valve groove, 25... Resilience spring.

Claims (1)

[Scope of utility model registration request] A fan 11 operated to suck dust by a motor 10
A transparent part 20c is formed on the upper surface of the dust collector main body 1, which is equipped with a filter 5 for collecting dust, and at least the upper surface thereof is transparent from the outside. communicates with the suction side,
A cylindrical indicator body 20 with the other end 20b open to the outside air is attached, and a valve hole 21b is bored in one end surface 21a inside the indicator body 20.
The outer cylindrical valve body 21, which has an inner valve body 23 with an outside air intake hole 23a bored in the other end port 21c, is slidably fitted so that it can be confirmed from the transparent part 20c. The body 21 is always held at the other end 20b of the indicator body 20 by the traction spring 22.
At the same time, the outer cylinder valve body 21 is pressed by an elastic spring 25 stronger than the pulling force of the traction spring 22 to constantly close the outside air intake hole 23a of the inner valve body 23. Also,
When the negative pressure on the downstream side of the filter 5 exceeds a set value, this negative pressure causes the elastic spring 2 to
A safety valve/indicator device for a vacuum cleaner, characterized in that a sliding valve 24 is fitted therein to open the outside air intake hole 23a by suction movement against the pressing force of 5.