JPH045935A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent air from leaking in a contact part of a safety device and to stabilize the performance by installing a seal member formed by a soft material on the seal surface of an inner cover. CONSTITUTION:To the seal surface of an inner cover 17, a seal member 21 formed by high density urethane is fixed, and brought into contact with an edge part 17a of an air inflow port of a cover. Since an inner cover 18 is pressed toward a cover 16 through a spring holder 20 by a spring 19, the seal member 21 is pressed against the edge part 17a of the air inflow port, but since the seal member 21 is formed by high density urethane, adhesion of the seal member 21 and the edge part 17a of the air inflow port is satisfactory, and its seal becomes complete. As a result, in a standard use state, it does not occur that air flows in from the seal face. Also, even if there is variance of spring force in the spring 19, since the seal of the seal member 21 and the edge part 17a of the air inflow port is complete, there is no malfunctioning of the cleaner due to air leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a safety device for a vacuum cleaner.

[Prior Art] Vacuum cleaners have been around for several decades, and they have spread to almost every household in Japan, and have now become one of the essential electrical appliances in every household. For this reason, there are many types of vacuum cleaners, and their functions are becoming more sophisticated.

However, there is no limit to the development of functions, and the current situation is that each manufacturer develops and adds new functions every day, and new products that are more convenient and easier to use are introduced and put on the market.

Usually, the most popular type of vacuum cleaner is a main unit that has a built-in motor-driven fan for air suction, a paper bag that filters and stores dust from the sucked air, and a vacuum cleaner that moves on the floor and collects dust along with the air. It consists of a floor nozzle for suctioning water, and a hose that connects the floor nozzle to the main body.

Figure 3 is a side view showing the vacuum cleaner, in which (1) is the vacuum cleaner body, (2) is the floor brush, (3) is the hose, and (4) is the vacuum cleaner body.
) is the operation part, (5) is the switch, (6) is the cord, (6
a) is the plug, and (7) is the floor surface.

Figure 4 is a cross-sectional view of the main body 1 of the vacuum cleaner, (a) in the standard usage state and (b) in the safety device operation state.
is the main body, (1a) is the air inflow hole drilled in the main body casing, (3) is the hose, (8) is the intake port, (9) is the paper pack, (10) is the filter, (11) is the fan and Motor, (12) is filter, (13) is safety device, (14)
) are arrows indicating air flow.

To use the above vacuum cleaner, as shown in figure (a), insert the other end of the hose (3) with the floor nozzle (2) attached to the tip into the air intake port (8) of the main body (1), and then The motor (11) is operated. As a result, the air (14) sucked in from the floor nozzle (2) along with the dust is transferred to the paper pack (9).
) After the dust is collected by the filter (10), it passes through the fan (11), and is then blown into the outside air through the filter (12).

A vacuum cleaner is normally operated as described above, but if cleaning continues for a long time, the paper packs (9) will become jammed and the pressure on the intake side of the fan will drop, overloading the fan and causing paper The air inside the pack will be compressed and its temperature will rise, potentially causing the fan and motor to overheat. To avoid this,
A safety device (13) is attached to the main body (1).

Figure 5 shows a cross-sectional view of the safety device (13), in which (13) is the safety device, (15) is the casing, and (15a) is the safety device.
) is the air outlet formed at one end, (1B) is the lid of the casing, (17> is the air inlet formed in the lid, (1
7a) is the edge, (18) is the inner lid, (18a) is the sill surface, (19) is the spring, and (20) is the spring holder.

The air inlet (17) of the lid (16) of the safety device is open to the atmosphere through the air hole (1a) of the main body, and the air outlet (15a) formed in the casing (15) is open to the atmosphere through the air hole (1a) of the main body.
) is released to the intake side of the fan. The air inflow port (17) is closed by the sealing surface (18a) of the inner lid from the inside of the casing (15), and the inner lid (18>) is connected to the lid (18) via the spring holder (2o) by the spring (19). 1
6), and therefore the inner lid sealing surface (18
a) is pressed against the edge of the air inlet. The safety device (13) of the vacuum cleaner is constructed as described above.

In the vacuum cleaner equipped with the safety device (13), by appropriately selecting the force of the spring (19) of the safety device, if the pressure on the intake side of the fan is equal to or higher than a predetermined pressure, the inner lid (13)
7) is pressed against the edge (17a) of the air inlet (17) of the lid to close the air inlet (17) and prevent air from flowing in from the air inlet (17); Therefore, the only air that enters the main body 1 is the air that is sent along with the dirt via the floor nozzle and hose. In this standard usage state, the vacuum cleaner is configured to operate normally.

However, as mentioned above, if the paper pack (9) becomes clogged due to long-term use of the vacuum cleaner, and the pressure on the intake side of the fan (11) drops below a predetermined pressure, the safety device (1
3) Atmospheric pressure acting on the inner lid (18) and the internal fan (
11) and the intake side pressure becomes large, and the inner lid (18)
The fan moves against the force of the spring (19) toward the intake side of the fan, and air from outside the main body flows into the main body from the air inlet (17) in the lid, as shown in FIG. 4(b).

As a result, the intake of air through the floor nozzle (2) and the hose (3) almost stops, but instead, external air flows directly into the main body (1) via the safety device (13), and the fan intake As the side pressure increases, the overheated fan and motor (11) are cooled down by the inflow of outside air. In this way, the safety device (13) has an important meaning in the operation of the vacuum cleaner.

[Problem to be solved by the invention] By the way, in the safety device of the vacuum cleaner mentioned above, the safety device (1
3) is usually made of synthetic resin, etc., but for example, the edge of the air inlet (17) (
17a) and the sealing surface (18a) of the inner lid that comes into contact with the edge.
The machining accuracy, such as flatness, cannot be said to be sufficient. In addition, due to assembly precision issues, the seal at the contact area between the sealing surface (18a) of the inner lid and the air inlet edge (17a) of the lid is not perfect, and air leakage may occur.Therefore, standard Even when in use, external air flows into the main body (1) from the safety device (13), blocking the inflow of air and dirt through the floor nozzle (2) and hose (3), reducing the cleaning efficiency of the vacuum cleaner. may cause a significant decrease in

Also, due to variations in the spring force of the spring (18) in the safety device, the sealing surface (18a) and the edge (17) of the air inlet
The seal caused by contact with a) is unstable, and as mentioned above, the performance of the vacuum cleaner is degraded.

The present invention has been made to solve the above problems of conventional vacuum cleaners, and aims to provide a vacuum cleaner that prevents air leakage at the contact portion of the safety device and stabilizes its performance. It is something.

[Means for Solving the Problems] In order to achieve the above object, in the safety device for a vacuum cleaner according to the present invention, a sealing member made of a soft material is attached to the sealing surface of the inner lid.

[Function] By using a soft material for the sealing member of the inner lid of the above-mentioned safety device, the contact between the sealing member of the inner lid and the edge of the air inlet is complete, the adhesion is improved, and the processing of the parts is improved. Even if the accuracy decreases a little, even if the spring force of the spring varies,
Air leakage at the contact area between the sealing member of the inner lid and the edge of the air inlet is eliminated.

[Embodiment of the Invention] Figure 1 is a sectional view of a safety device for a vacuum cleaner showing an embodiment of the present invention, in which (13) to (2o) are the same or equivalent parts as in the conventional device, (21) is a sealing member.

As shown in the figure, a sealing member (21) made of high-density urethane is fixed to the sealing surface of the inner lid (17), and this sealing member (21) is attached to the edge (1) of the air inlet of the lid.
7a). Since the inner lid (18) is pressed toward the lid (16) by the spring (19) via the spring holder (20), the sealing member (21) is pressed against the edge (17a) of the air inlet. However, since the seal member (21) is made of high-density urethane, the seal member (21) is made of high-density urethane.
1) and the edge (17a) of the air inlet have good adhesion,
The seal will be complete. As a result, air will not flow in from the sealing surface in the standard operating condition, and the vacuum cleaner will be in perfect operating condition. Also spring (
Even if there is variation in the spring force of the sealing member (2)
1) and the air inlet edge (17a) are completely sealed, so air will not leak and the vacuum cleaner will not malfunction.

In this embodiment, the material of the sealing member is high-density urethane, but it is not limited to high-density urethane, and other soft materials may be used.

[Effects of the Invention] In the vacuum cleaner according to the present invention, since a soft material is used for the sealing member of the air inlet of the safety device of the vacuum cleaner, the seal at the air inlet is perfect. As a result, when the vacuum cleaner is in standard use, external air is no longer sucked into the main body by the safety device, which obstructs the suction of dirt from the floor nozzle and reduces the cleaning efficiency of the vacuum cleaner. In addition, because of the good adhesion on the sealing surface, even if the force of the spring used in the safety device varies, air will not leak from the sealing surface and the vacuum cleaner can be used efficiently. became.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a safety device of a vacuum cleaner which is an embodiment of the present invention, Fig. 2 is a sectional view of a safety device when drawing external air, Fig. 3 is a side view of the vacuum cleaner, and Fig. 4 is a sectional view of a safety device of a vacuum cleaner according to an embodiment of the present invention. Figure (a) is a cross-sectional view of the main body of a conventional vacuum cleaner in standard use, and figure (b)
5 is a sectional view of the main body when the safety device is in operation, and FIG. 5 is a sectional view of the conventional safety device. In the figure, (1> is the main body, (13) is the safety device, (15) is the casing, (16) is the lid, (17) is the air inlet, (1
7a) is the edge, (18> is the inner lid, (19) is the spring,
(20) is a spring holder, and (21) is a sealing member. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] When the suction pressure of the fan in the main body becomes less than a predetermined pressure,
In a vacuum cleaner configured to allow external air to flow into the main body through an air inlet of a safety device disposed inside the main body, the suction pressure of the fan comes into contact with the edge of the air inlet of the safety device. 1. A vacuum cleaner characterized in that a sealing member is formed of a soft material to seal the inflow of external air into the safety device when the pressure is higher than a predetermined pressure.