JPH04152921A - Safety device for vacuum cleaner - Google Patents

Abstract

PURPOSE:To lower the exhaust heat temperature, and to prevent the generation of thermal deformation of a cleaner main body and the burning out of a motor-driven blower by opening an auxiliary suction port, and allowing the open air to flow in, when a temperature in an air blower built-in chamber reaches a prescribed temperature by an operation of the air blower. CONSTITUTION:When dust is accumulated in a paper bag 2 by using a vacuum cleaner main body 1, an air flow rate for flowing into a motor-driven blower 4 through a path of a floor sucker a hose a suction port the paper bag 2 a dust collecting chamber 3 is lowered, and an exhaust temperature which passes through the blower 4, passes through the inside of a driving chamber 5 and is discharged to the outside of the main body 1 of the vacuum cleaner from an exhaust port 18 rises. In connection therewith, a temperature in the driving chamber 5 rises, and a heat transmission part 17 of a bimetal valve 13 placed in the driving chamber 5 is also subjected to temperature rise in the same way. When a temperature in the driving chamber 5 goes to about 80 deg.C, a cover part 16 is inverted to the dust collecting chamber 3 side due to a difference of thermal expansion of a metallic plate B 15 and a metallic plate A 14, an auxiliary suction port 12 is opened and the air flows into the blower 4 from the inside of the dust collecting chamber, an exhaust temperature is lowered and a temperature in the driving chamber 5 is lowered. In such a way, abnormality such as burning of the motor-driven blower, etc., can be prevented.

Description

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

Conventional technology Conventionally, there have been two methods for this type of device.

The first method, as shown in Japanese Utility Model Application Publication No. 52-42574, detects the vacuum pressure on the intake side of the electric blower, which decreases due to the accumulation of dust inhaled during operation of the electric blower, and reaches a predetermined vacuum pressure. Sometimes, a bypass passage provided separately from the dust suction passage is opened, and air flows in through the bypass passage to cool the electric blower, thereby preventing the electric blower from overheating and deforming the vacuum cleaner body due to heat. It is.

The second method is to incorporate a thermostat in series with the power supply circuit of the electric blower, and when the temperature of the vacuum cleaner body rises above a predetermined temperature due to exhaust heat from the electric blower, the circuit is opened and the electric blower is operated. This method prevents the electric blower from overheating and the vacuum cleaner itself from deforming due to heat.

Problems to be Solved by the Invention However, in recent years, it is possible to solve the problem by changing the number of revolutions of the electric blower by changing the power supplied to the electric blower through manual adjustment by the person using the vacuum cleaner. Products that adjust the suction power according to the type of vacuum cleaner or cleaning surface have become popular.With this product, the degree of vacuum on the intake side of the electric blower changes depending on the power supply status, even if dust has accumulated inside the vacuum cleaner itself. Therefore, in the first method, for example, in a state where the strongest suction force can be exerted, when a predetermined vacuum pressure is reached, air is introduced to prevent the electric blower from overheating. In the operating state, even when the amount of accumulated dust is nearly full, the bypass passage does not open due to the low degree of vacuum, which has the drawback that the purpose of preventing the electric blower from overheating cannot be achieved.

Furthermore, the second method has the disadvantage that if the circuit is opened by the operation of the thermostat, the operation of the electric blower will naturally stop, making it impossible to use the vacuum cleaner until the thermostat returns to normal operation. .

The present invention aims to solve these problems and provide a safety device for a vacuum cleaner that is easy to use.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to sense the temperature inside the vacuum cleaner's electric blower built-in room, which rises due to the operation of the electric blower, and to increase the temperature to a predetermined temperature. Then, a deformable bimetal valve and an auxiliary intake port are provided on the intake side of the electric blower, and the auxiliary intake port is normally closed by the bimetal valve, and is opened when the bimetal valve is deformed.

Function: When the electric blower is operated and the temperature inside the electric blower built-in room reaches a predetermined temperature, the bimetal valve deforms and opens the auxiliary intake port, which allows air to flow into the electric blower and exhaust air from the electric blower. It lowers the thermal temperature and prevents thermal deformation of the vacuum cleaner body and burnout of the electric blower.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 to 3, the main body 1 of the vacuum cleaner has a dust collection chamber 3 in the front that houses a paper bag 2 that filters and collects dust sucked in through a floor suction tool, an extension pipe, and a hose. At the rear, there is a drive chamber 6 that houses an electric blower 4, a cord winding device, and the like. An upper lid 6 is attached above the dust collection chamber 3 to cover the dust collection chamber 3 so as to be openable and closable. The rear part of the upper cover 6 engages with the upper main body 7, and the latter is attached to the main body 1 by means of a buckle 8.

The paper bag 2 is installed in the dust collection chamber 3 with a mouth frame 1o attached to the side of the electric blower 4 of the inlet 9 to which the hose is connected. An auxiliary intake port 12 is formed in the front upper part of the electric blower 4 and is closed with a bimetal valve 13, with a balagin 11 attached to the dust collection chamber 3 side. The bimetal valve 13 includes a substantially circular lid portion 16 that faces and closes the auxiliary intake port 12 and is made by pasting together a metal plate A14 with a large coefficient of linear expansion and a metal plate E1s with a coefficient of linear expansion smaller than that of the metal plate A14. , and is fixed to the upper body 7. The heat transfer section 17 transmits the temperature inside the drive chamber 5, which increases due to the exhaust heat of the electric blower 4, to the lid section 16.

The atmosphere containing grave dust is filtered and purified by a paper bag 2, passes through an electric blower 4, passes through a drive chamber 5, and is then sent to an exhaust port 1.
8 to the outside of the main body 1.

Next, the operation and effects of the above configuration will be explained. When the vacuum cleaner body 1 is used and dust accumulates in the paper bag 2, the flow rate of air flowing into the electric blower 4 through the floor suction device - Honu air intake 9 - paper bag 2 - dust collection chamber 3 is reduced. decreases,
Passes through the electric blower 4, passes through the drive chamber 5, and exits at the exhaust port 18.
The temperature of the exhaust gas discharged outside the main body 1 of the stain removal cleaner increases.

Along with this, the temperature inside the drive chamber 5 rises, and the drive chamber 6
The temperature of the heat transfer portion 17 of the bimetallic valve 13 disposed therein similarly rises. When the temperature inside the drive chamber ε reaches approximately 8oC, the lid part 16 is turned over to the dust collection chamber 3 side due to the difference in thermal expansion between the metal plate E15 and the metal plate A14, and the auxiliary intake port 12 is opened to collect the atmosphere. Electric air blower I% from inside dust chamber 3! flowing into 4,
The temperature inside the drive chamber 6 is lowered by lowering the exhaust gas temperature. When the temperature inside the drive chamber 5 reaches approximately 75° C., the lid portion 16 is turned back to its original state to close the auxiliary intake port 12 again, returning to the initial state of use.

As a result, by keeping the temperature inside the drive chamber 5 below the thermal deformation temperature of the synthetic resin forming the main body 1, the main body 1 can be maintained in good working condition, and furthermore, the electric This can prevent abnormalities such as burnout of the blower.

In addition, since the above actions and effects depend only on the temperature inside the drive chamber ε, in any suction force state used in a vacuum cleaner that adjusts the suction force by changing the rotation speed of the electric blower 4, As a result of the bimetal valve 13 operating as a safety device as described above, the operating range of the device is expanded and the usability is significantly improved compared to the conventional safety device that operates based on pressure changes in the collection chamber.

Furthermore, the suction force that sucks dust from the tip of the floor suction tool through the suction port 9 is reduced by the fact that the cover 1e is inverted and the auxiliary suction port 12
Although it decreases slightly when the airflow is closed, it does not interfere with normal use, and it is far more user-friendly than the conventional safety device that uses a thermostat to stop the operation of the electric blower.

Effects of the Invention As described above, the present invention includes a bimetallic valve that senses the temperature inside the room where the electric blower of a vacuum cleaner is built-in and deforms at a predetermined temperature when the electric blower is operated, and an auxiliary intake port on the intake side of the electric blower. The auxiliary intake port is normally closed by a bimetallic valve, and is opened when the bimetallic valve is deformed, thereby obtaining the following effects.

(1) When the room with built-in electric blower reaches the specified temperature,
The bimetal valve deforms and the auxiliary air intake opens, allowing air to flow into the electric blower, lowering the exhaust heat of the electric blower, and maintaining the temperature of the electric blower built-in room below the heat distortion temperature to prevent heat distortion. . It also prevents burnout of the electric blower that occurs at temperatures above the above range.

(1) The opening and closing of the auxiliary intake port by the bimetal valve depends only on the temperature inside the room with the built-in electric blower. Therefore, it can continue to be used as a vacuum cleaner even when the bimetal valve is in operation, greatly increasing usability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the vicinity of the safety device showing an embodiment of the present invention, Fig. 2 is a sectional view of the center of the same electric sword vacuum cleaner, and Fig. 3 is a sectional view showing the state of the safety device when it is in operation. be. 1...Main body, 3...Dust collection chamber, 4...
Electric blower, 5... Drive chamber, 12... Auxiliary intake port, 13... Bimetal valve, 14...
・Metal plate A, 15...Metal plate B, 16...
- Lid part, 17...Heat transfer part. Name of agent: Patent attorney Akira Okaji and 2 other names

Claims (1)

[Claims] It is equipped with a bimetallic valve that senses the temperature in the room with a built-in electric blower that increases when the electric blower is operated, and deforms when the temperature reaches a predetermined temperature, and an auxiliary intake port formed on the intake side of the electric blower. A safety device for a vacuum cleaner in which the intake port is normally closed by the bimetal valve and is opened when the bimetal valve is deformed.