JPS5811330Y2 - Vacuum cleaner temperature rise prevention device - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a device for preventing excessive temperature rise in vacuum cleaners.
This is intended to make the device operate more reliably.

Vacuum cleaners generally have a temperature overheat prevention device as a safety device that sends cooling air to prevent burnout of the electric blower when the dust suction hose etc. is clogged with dust or when the dust box is full of dust. is installed, and structurally, as shown in Fig. 5, a valve structure that opens by the vacuum pressure of an electric blower using a compression coil spring 16' is often used, but due to the overall structure of the vacuum cleaner, It is installed in the position shown in the figure, and air is often taken in from the side of the valve.

Therefore, as mentioned above, when the vacuum pressure increases due to dust clogging, etc. and the valve opens, the vacuum pressure applied to the valve is uniform at all parts of the valve before it opens, but from the moment it opens, the intake air Since the direction side is closer to the intake passage than the opposite side, air is easily sucked in, so the dynamic pressure increases, causing the valve 15' to tilt and catch on the support 14', as shown in Figure 5. condition, the spring 16' also buckles, the operation is unstable, and the valve 1
Since 5' cannot be lowered completely, there have been problems such as not being able to secure the necessary amount of cooling air.

This invention attempts to solve the above conventional problems.
An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, a main body 1 of the vacuum cleaner is provided with a main body handle 2 on the upper surface, and has an electric blower 3 built therein via a front shock absorber 4 and a rear shock absorber 5.

A dust box 6 is provided with a dust box handle 7 on the top surface and has a filter device 8 built therein.

9 is a buckle device for attaching the dust box 6 to the main body 1, and 10 and 11 are casters and rollers for movement.

Reference numeral 12 denotes a temperature overrise prevention device, in which a support body 14 is fitted to a lid body 13, and a valve 15 for opening and closing a ventilation hole 13a provided in the lid body 13 and a spring 16 for biasing this valve 15 are housed inside the support body 14. It is being

Reference numeral 17 denotes a communication hole that communicates with the electric blower 3 provided in the main body 1, and is located on the side of the overtemperature rise prevention device 12.

A semi-cylindrical shielding portion 14a is formed on the side wall of the support body 14 at a portion facing the communication hole 17 and approximately half the circumference in the vicinity thereof.

In the above structure, due to the dust box 6 being filled with dust, etc.
When the intake air from the intake port 18 formed in the front part of the dust box 6 is cut off, air flows through the communication hole 17 provided in the main body 1.
The high vacuum pressure of the electric blower 3 reaches the overtemperature rise prevention device 12 and the valve 15 opens, but because the support 14 is formed with the semi-cylindrical shielding part 14a as described above, , air is not unilaterally sucked from the communication hole 17 side as in the conventional case, so the communication (L17 side) does not open at an angle, and the valve 1
5 becomes more susceptible to uniform dynamic pressure, lowering to a lower position and increasing the amount of intake air.

In the above embodiment, the shielding part is provided integrally with the support body 6, but it goes without saying that the same effect can be obtained even if the shielding part is provided on the lid body 13 or as a separate part. It is.

As described above, according to the present invention, by providing a shielding part on the side of the communication hole located on the side, the dynamic pressure applied to the valve can be made uniform, ensuring reliable operation of the valve and a relatively large amount of cooling air volume. This has a great practical value, as it has the additional effect of protecting movable parts such as springs and valves from the outside.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a vacuum cleaner incorporating an overtemperature rise prevention device according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the overtemperature rise prevention device, and Fig. 3 is a bottom view of the vacuum cleaner. Figure 4 is a perspective view of the support;
FIG. 5 is a sectional view of a conventional example. 3...Electric blower, 13a...Vent hole, 14...Support, 14a...Shielding part, 15...Valve, 16・・・・・・Spring, 17・
...Communication hole.

Claims (1)

[Scope of utility model registration request] A valve that opens and closes the vent, a support that slidably holds the valve, a spring that is held by the support and biases the valve toward the vent, and supports the airflow flowing in from the vent. a communication hole located on the side of the support body that leads through the body to the electric blower, and a semi-cylindrical shielding portion is provided on the side of the support body in a portion facing the communication hole and in the vicinity thereof; Vacuum cleaner overheat prevention device.