JPH0350859Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a display device for a vacuum cleaner.

BACKGROUND ART Conventionally, a display device of this type of vacuum cleaner has a structure as shown in FIGS. 8 and 9, for example.

That is, 1 is a lid that removably covers the upper opening of the dust collection chamber, 1a is a window provided in the lid 1, and 2 is a transparent lid that communicates with the window 1a at one end and communicates with the dust collection chamber at the other end. The indicator pipe 2a is a sliding part that is formed integrally with the indicator pipe 2 and has a slightly larger diameter than the small diameter part 3a at the tip of the pointer 3;
4 is a spring that comes into contact with the pointer 3 sliding inside the pipe 2 and biases the pointer 3 toward the side where its small diameter portion 3a fits into the sliding portion 2a of the pipe 2; 5 receives the spring 4; A ring-shaped indicator lid 6 is a gasket for improving the tightness between the indicator pipe 2 and the lid 1.

The operation in the above configuration will be explained. The small diameter portion 3a of the pointer 3 moves in response to the pressure difference between the atmospheric pressure acting on one side of the pointer 3 through the window 1a and the negative pressure inside the dust collection chamber acting on the pointer 3 from the other side through the indicator lid 5. By sliding inside, it serves as an indicator. Furthermore, if the pressure difference becomes extremely large, the small-diameter portion 3a of the pointer 3 will come off the sliding portion 2a as shown in Fig. 9, and the small diameter portion 3a of the pointer 3 will be removed from the sliding portion 2a, acting as an air protector to draw outside air into the dust collection chamber through the window 1a. What they fulfilled was common.

Problems to be Solved by the Invention However, with such a structure, the fine dust entering through the window 1a may be damaged by the small diameter portion 3a of the pointer 3 and the pipe 2.
There was a problem in that the pointer became clogged with the sliding portion 2a, causing malfunction of the pointer.

In addition, in order to solve this problem, the small diameter portion 3 of the pointer 3
It is conceivable to increase the gap between a and the sliding part 2a, but this will increase the intrusion of outside air when acting as an indicator, that is, the leakage, which will lead to a decrease in the suction power. However, it was not a sufficient countermeasure.

Another possible measure is to add a filter such as urethane foam between the window 1a and the sliding part 2a to stop the fine dust there, but if the filter becomes clogged with fine dust, the pointer 3 will not work normally. Therefore, this cannot be a sufficient countermeasure, and an improvement has been desired.

The present invention solves the above-mentioned problems, and aims to provide a display device for a vacuum cleaner that can reduce the malfunction of the pointer due to dust clogging without deteriorating the performance.

Means for Solving the Problems In order to solve the above conventional problems, the present invention
A transparent pipe that communicates with the atmosphere on one side and a negative pressure section on the other side is equipped with a slidable pointer biased toward the atmosphere by a spring, etc., and the pressure difference between the atmosphere and the negative pressure section The above-mentioned pointer is a display device for a vacuum cleaner in which the above-mentioned pointer slides inside the above-mentioned pipe. A guide hole is provided that can move in and out, and the cross-sectional shape of the small diameter portion of the pointer gradually becomes smaller from the intermediate position toward the negative pressure side.

Effect With the above configuration, when the pressure difference between atmospheric pressure and the inside of the dust collection chamber is small, that is, when the pointer does not work or only works a little,
Since the cross-sectional shape of the small diameter part of the pointer becomes considerably smaller than the shape of the guide hole of the indicator pipe as it moves toward the negative pressure side, the possibility of leakage becoming large and clogging with fine dust can be minimized. As the difference increases, the pointer slides further toward the negative pressure side, and the difference in cross-sectional area between the small-diameter part of the pointer and the guide hole decreases.For example, when the suction power is at its maximum, for example, around an air volume of 1.0 m ³ /min, the pointer slides further toward the negative pressure side. The straight part at the tip of the small diameter part inscribed in the hole is no different from the indicator/air protector shown in the conventional example, and the suction power does not decrease. Also, at this point, the straight part of the small diameter part of the pointer is shorter than the conventional one, and the part where the small diameter part contacts the guide hole is also much shorter than the conventional pipe sliding part. Because it is short, the possibility of fine dust clogging is extremely small, improving the reliability of the indicator and air protector.

Embodiment An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention;
Figure 2 is a state diagram showing the state in which it is operating as an air protector, Figure 3 is an enlarged perspective view of the pointer, and Figure 4
The figure is an overall perspective view of the vacuum cleaner, FIG. 5 is an exploded perspective view of essential parts, and FIG. 6 is a sectional view.

In Figures 1 to 6, 10 is the outside of the main body housing the fan motor 11, and 12 is the dust collection chamber 13.
15 is a removable dust collection chamber lid for taking in and taking out the dust collection bag 14, and 15 is an air intake port 16 for maintaining tightness with the hose and the dust collection bag 14.
17 is an intake filter made of urethane foam to prevent fine dust from entering the fan motor 11, 18 is an exhaust filter attached to the exhaust port 19, 20 is a switch petal, and 21 is a dust collection chamber. An indicator window provided in the lid 12; 22 is a transparent indicator pipe that communicates one end with the indicator window 21 and the other end with the dust collection chamber 13; 22a is a guide hole provided at the end of the pipe 22; Consists of the same pointer sliding part,
The diameter is slightly larger than the small diameter part of the pointer described later,
The small diameter portion is provided at the atmospheric side end of the indicator pipe 22 so as to be able to move in and out. Reference numeral 23 denotes an indicator pointer that slides inside the indicator pipe 22, and has a straight part 23a at its atmospheric side end that is almost inscribed with the guide hole 22a provided in the indicator pipe 22, and then a straight part 23a whose cross-sectional shape gradually changes toward the root part. A small diameter portion consisting of a reduced leakage portion 23b is formed,
A rib 23c is provided on the outer periphery of the draining portion 23b, and is substantially inscribed with the guide hole 22a to prevent the pointer 23 from wobbling.
The contact with the guide hole 2 is almost a line contact, and the contact with the guide hole 2 is almost a line contact.
2a's leaking part 23b and straight part 23a
The contact area is extremely short. 2
Reference numeral 4 denotes an indicator spring for sliding the indicator pointer 23 due to the pressure difference between the atmospheric pressure and the inside of the dust collection chamber 13, and urges the pointer 23 toward the side where its small diameter portion fits into the guide hole 22a. ing. 25 is a ring-shaped indicator lid that fixes one end of the indicator spring 24; 26 is a fixing claw protruding from one end of the indicator pipe 22; 27 is a screw seat formed at a position opposite to the fixing claw 26; 28 is a screw seat formed at a position opposite to the fixing claw 26; Receiving part of the fixing claw 26 provided on the dust collection chamber lid 12, 2
9 is a screw hole also provided in the dust collection chamber lid 12;
0 is a set screw, and 31 is an indicator gasket provided between the dust collection chamber cover 12 and the indicator pipe 22 to improve air tightness.

The operation in the above configuration will be explained. Intake port 16
The dust-containing air sucked in is filtered by a dust collection bag 14, passes through an intake filter 17 and a fan motor 11, and is then passed through an exhaust port 19 and an exhaust filter 18.
It is then released to the outside. When dust accumulates in the dust collection bag 14, the flow path resistance increases and the pressure inside the dust collection chamber 13 decreases, so the indicator pointer 23 slides according to the pressure difference with the atmosphere, The pressure drop within the dust collection bag 14, that is, the amount of dust in the dust collection bag 14 can be displayed through the indicator window 21. Further, when the pressure difference between the atmospheric pressure and the dust collection chamber 13 becomes extremely large, the small diameter portion of the indicator pointer 23 comes off from the guide hole 22a, thereby acting as an air protector that takes in outside air.

Now, when the leaking part 23b is located in the guide hole 22a, that is, when the pressure difference between the atmospheric pressure and the inside of the dust collecting chamber 13 is small, the leakage is large and the clogging of fine dust becomes extremely small. The pressure difference further increases and the suction power reaches its maximum air volume of 1.0
In the vicinity of m ³ /min, by setting the load of the indicator spring 24 so that the straight portion 23a comes to the guide hole 22a, it is possible to minimize the reduction in suction power due to leakage. Further, since the length of the straight portion 23a is short and the contact with the pointer sliding portion 22a is almost a line contact, the possibility of fine dust becoming clogged here is extremely small.

The P-Q curve in the characteristic diagram shown in Figure 7 shows the change in air volume Q and suction power P of a general household vacuum cleaner, and the air volume is approximately 1.0 m ³ /
The maximum value is reached near min. Further, the L-Q curve shows the degree of leakage from the indicator pointer 23 as the air volume changes, and the leakage is kept to a minimum at the portion where the suction power is maximum.

Effects of the device As described above, according to the present invention, the sliding area between the indicator pointer and the indicator pipe is made extremely small, and the indicator pointer is actively drained within the operating range of the indicator pointer that does not affect the suction power. This reduces indicator malfunctions caused by fine dust clogging. Furthermore, the reliability of the indicator/air protector can be improved, and the safety of the product can be improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
Fig. 2 is a cross-sectional view of the essential parts showing the state in which it operates as an air protector, Fig. 3 is an enlarged perspective view of the indicator pointer, Fig. 4 is an overall view of the vacuum cleaner with a built-in display device, and Fig. 5 The figure is an exploded perspective view of the main part, Fig. 6 is a sectional view thereof, Fig. 7 is a characteristic diagram showing the effect of this embodiment, Fig. 8 is a sectional view of the main part showing the conventional example, and Fig. 9 is the main part. FIG. 3 is a state diagram showing a state in which the air protector is operated in a partial sectional view. 22... Indicator pipe, 22a... Guide hole, 23... Indicator pointer, 23a...
Straight part, 23b... Squirting part, 23c...
Rib, 24...Indicator spring.

Claims (1)

[Scope of utility model registration request] A transparent pipe that communicates with the atmosphere on one side and a negative pressure section on the other side is equipped with a slidable pointer biased toward the atmosphere by a spring, etc., and the pressure difference between the atmosphere and the negative pressure section The above-mentioned pointer is a display device for a vacuum cleaner in which the above-mentioned pointer slides inside the above-mentioned pipe. A display device for a vacuum cleaner, wherein a guide hole is provided that can be freely moved in and out, and the cross-sectional shape of the small-diameter portion of the pointer gradually becomes smaller from an intermediate position to a negative pressure side.