JPH0824643B2 - Vacuum cleaner dust collection display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dust collection amount display device for an electric vacuum cleaner.

2. Description of the Related Art Conventionally, a mechanical type display device of this type has been constructed as shown in FIG. That is, the display device 1
Is a pointer 2 and a pointer spring 3 that biases the pointer 2 backward,
From a pointer lid 5 which is located behind the pointer 2 and has a through hole 4, a transparent and cylindrical pointer tube 6 which holds these, and a communication tube 8 which connects the tip of the pointer tube 6 and the dust collection chamber 7 to each other. And covers the dust collection chamber 7 of the vacuum cleaner body 9 from above, and the recess of the front body 10.
Attached to 11, the communication pipe 8 communicates with the dust collection chamber 7, and the lid plate
The pointer 2 was configured so that it could be seen from the outside by the display unit 13 provided on the display 12.

When dust is accumulated in the dust collecting bag 14 using the electric vacuum cleaner body 9, the pressure in the dust collecting chamber 7 gradually decreases from atmospheric pressure, and acts on the pointer 2 when the pressure falls further below a predetermined pressure. Due to the vacuum pressure, the pointer 2 moves toward the communication tube 8 side against the spring biasing force of the pointer spring 3. At this time, the position of the pointer 2 visible from the display window 13 changes, and the user can recognize when dust is discarded.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the display device 1 described above, when the pointer 2 is displaced to the side of the communication pipe 8 even a little, the atmosphere flows into the dust collecting chamber 7 through the through hole 4, so that the original condition of the electric vacuum cleaner is reduced. The suction force from the suction port decreases. Therefore, the displacement start pressure of the pointer 2 must be set so that the pointer 2 is displaced when the dust is accumulated almost completely in the dust collecting bag 14, and the pointer 2
Had a drawback that it did not move in proportion to the amount of accumulated dust.

An object of the present invention is to solve this problem and to provide a user-friendly dust collecting amount display device for an electric vacuum cleaner at low cost.

Means for Solving the Problems The technical means of the present invention for solving the above problems are a substantially hat-shaped valve body that is deformed by the differential pressure between the vacuum pressure and the atmospheric pressure generated by the operation of the electric blower, and A pointer arranged on the vacuum pressure side with respect to the valve body and displaced by deformation of the valve body; a pointer spring biasing the pointer toward the atmospheric pressure side so as to start displacement under a predetermined vacuum pressure; A pointer tube that is a substantially transparent cylinder having a pointer inside, a communication tube that airtightly connects the vacuum pressure section and the pointer tube in the vacuum cleaner body, and a hollow, substantially frame-shaped cover that covers the valve body from the atmospheric pressure side. The valve body is provided with a pointer lid, and the valve body is sandwiched between the pointer cylinder and the pointer lid to shut off the vacuum pressure portion and the atmospheric pressure portion.

Action This action shuts off the vacuum pressure part and the atmospheric pressure part by the valve element sandwiched between the pointer cylinder and the pointer lid, so even if the pointer is displaced due to the deformation of the valve element, air leakage, that is, suction force Therefore, the deformation start pressure of the valve body can be brought closer to the atmospheric pressure than in the conventional case, and the pointer can be displaced substantially in proportion to the accumulated amount of dust.

Example Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3, the main body 21 of the electric vacuum cleaner has a dust collecting chamber 23 in the front, which accommodates a paper bag 22 for collecting and collecting dust sucked through a floor suction tool, an extension pipe, and a hose. An electric blower 24, a cord winding device, etc. are built in the rear. An upper lid 25 is attached above the dust collection chamber 23 and the dust collection chamber
It covers 23 freely. The upper lid 25 has a rear main body 26
The front portion is attached to the main body 21 by the action of the buckle 27, and the recessed portion 28 is formed in the center of the upper portion, and the dust collection amount display device 29 is attached.

The dust collection amount display device 29 includes a transparent pointer cylinder 30,
Green pointer A31 and red pointer B32 that slide together in the pointer cylinder 30, communication pipe 33 that connects the dust collection chamber 23 and the pointer cylinder 30, communication pipe 3
It is arranged between 3 and the pointer A31, and connects the pointer A31 and the pointer B32 to the communication pipe 33
And a pointer valve 36 that is sandwiched between the pointer cylinder 30 and the pointer lid 35 to hermetically shut off the pointer B32 side and the pointer lid 35 side.

Inside the attachment side of the pointer cover 35 of the pointer cylinder 30, the inner wall has a double cylinder shape.
37 is formed, and the position of the pointer B32 is regulated by the tip of the inner wall 37 on the communication pipe 33 side. The pointer A31 and the pointer B32 are coupled to each other by a concave-convex fit. The pointer B32 is composed of a substantially cylindrical outer peripheral wall 38 and an inner peripheral wall 39, and a substantially hat-shaped pointer valve 36 made of a thin film having rubber elasticity covers the inner peripheral cylinder 39, and a pointer lid 35 is substantially cylindrical and substantially hat-shaped. The pointer valve 36 is covered from the outer peripheral side. Pointer lid
The center of 35 is open and communicates with the outside of the main body 21, and the communication pipe 33
Since one end of the guide valve 36 is inserted into a through hole 40 provided in the lower surface of the recess 28 and communicates with the dust collection chamber 23, the atmospheric pressure is on the pointer lid 35 side of the pointer valve 36 and the electric blower is on the pointer B32 side. The vacuum pressure generated by the operation of 24 acts respectively.

The pointer valve 36 has a suction force in the inward direction of the dust collection chamber 23 due to the pressure difference acting on the inside of the inner wall 37 of the pointer cylinder 30, and a pointer spring 34.
The needle B32 is deformed by receiving the spring biasing force of the above and displaces the pointer B32 toward the communication pipe 33 side.

Reference numeral 41 denotes a lid plate having a display window hole 42 above the pointer cylinder 30, which is fitted in the recess 28. When the electric blower 24 is not operating, the pointer A31 can be seen through the display window hole 42.

Next, the operation and action of the above configuration will be described.
When dust accumulates in the paper bag 22 using the electric vacuum cleaner body 21, the flow rate of air flowing into the electric blower 24 decreases, and the pressure in the dust collection chamber 23 gradually decreases below atmospheric pressure. When the amount of dust accumulated increases and this vacuum pressure becomes lower than a predetermined pressure, the pointer valve 36 is provided due to the differential pressure from the atmospheric pressure acting on the inner wall 37 of the pointer cylinder 30.
The suction force that draws toward the communication pipe 33 becomes larger than the spring biasing force of the pointer spring 34. At this time, in the pointer valve 36, a portion of the pointer B32 that comes into contact with the inner peripheral cylinder 39 is connected to the communication pipe 33 between the inner peripheral cylinder 39 and the inner wall 37.
Side, it is inverted and deformed into a U-shaped cross section, and at the same time pointer A31 and pointer B
32 is slightly displaced toward the communication pipe 33 side.

When the suction force increases as the accumulation of dust increases, the approximately U-shaped reverse deformation amount of the pointer valve 36 gradually increases, and the pointer A3
1. Gradually move the pointer B32 to the communication pipe 33 side. This time,
From the display window hole 42, the green pointer A31 and the red pointer B32 can be seen at the same time. If the amount of dust exceeds the specified amount, pointer A31 and pointer B
The displacement amount of 32 becomes the maximum, and the red pointer is displayed from the display window hole 42.
Only B32 can be seen, the user is notified of the dust disposal time, the paper bag 22 is replaced with a new one, and the bag is started to be reused with a strong suction state.

By the way, since the pointer valve 36 is sandwiched between the pointer cylinder 30 and the pointer lid 35 to completely shut off the vacuum pressure portion on the pointer B32 side and the atmospheric pressure portion on the pointer lid 35 side, the pointer valve 36 and the pointer A31 or Even if the pointer B32 is displaced, the atmospheric air does not flow into the dust collecting chamber 23 through the pointer cylinder 30, so that the unnecessary suction force does not decrease. Further, since the above-described decrease in suction force does not occur, the spring biasing force of the pointer spring 34 in the initial state can be reduced, and the pointer valve 36 can be gradually deformed from the state where the vacuum pressure is low, and the display window hole 42 The displacement movement of the pointers A31 and B32 in the inside can be gradually performed almost in proportion to the decrease in pressure, and the user can recognize the dust accumulation amount more accurately than before. As a result, even when the dust mainly composed of the fibrous dust is sucked in, the pointers A31 and B32 can be reliably displaced within the displacement range that catches the user's exchange of the paper bag 22, and the pointer becomes full of dust. It is possible to prevent problems such as rupture due to continuous use of the paper bag 22.

By the way, the pointer valve 36 is sandwiched between both parts by fitting the pointer lid 35 of the pointer cylinder 30, and at the same time obtains airtightness and shuts off the vacuum pressure side and the atmospheric pressure side. The unit parts can be in the vacuum cleaner body
It can be assembled separately from the assembly of 21.

Further, since the pointer lid 35 covers the pointer valve 36 from the atmospheric pressure side, it is possible to prevent the thin film pointer valve 36 from being damaged during the transportation of the dust collection amount display device 29 assembled as a unit part.

EFFECTS OF THE INVENTION As described above, the present invention has a substantially cap-shaped valve body that is deformed by the pressure difference between the vacuum pressure and the atmospheric pressure generated by the operation of the electric blower, and is arranged on the vacuum pressure side with respect to the valve body. , A pointer that is displaced by the deformation of the valve body, a pointer spring that biases the pointer toward the atmospheric pressure side so as to start displacing the pointer under a predetermined vacuum pressure, and a pointer of a substantially transparent cylindrical body having the pointer inside A cylinder,
The vacuum cleaner body is provided with a communication pipe for air-tightly connecting the vacuum pressure portion and the pointer cylinder, and a hollow, substantially frame-shaped pointer lid that covers the valve body from the atmospheric pressure side. By sandwiching the needle with the pointer lid to shut off the vacuum pressure part and the atmospheric pressure part, even if the pointer is displaced according to the deformation of the valve body, air leakage, that is, the suction force does not decrease, and therefore the valve body The deformation starting pressure can be brought closer to the atmospheric pressure than in the conventional case, and the pointer can be displaced substantially in proportion to the accumulated amount of dust.

Further, the valve body is sandwiched between the pointer cylinder and the pointer lid, and at the same time, airtightness is obtained to shut off the vacuum pressure side and the atmospheric pressure side, so that the dust collection amount display device can be easily made into a unit part, and the electric vacuum cleaner It is possible to provide a dust collection amount display device at low cost by enabling assembly separately from the assembly of the main body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a dust collection amount display device showing an embodiment of the present invention, FIG. 2 is a central cross-sectional view of the same vacuum cleaner, and FIG. 3 is a state of the dust collection amount display device in operation. FIG. 4 is a cross-sectional view showing the center of a conventional electric vacuum cleaner. 23: Dust collection chamber, 29: Dust collection amount display device, 30: Pointer tube,
31 ……… Indicator A, 32 …… Indicator B, 33 …… Communication pipe, 34 ……
Pointer spring, 35 ... Pointer lid, 36 ... Pointer valve.

Claims (1)

[Claims] 1. A substantially cap-shaped valve body that is deformed by a pressure difference between a vacuum pressure and an atmospheric pressure generated by the operation of an electric blower, and a vacuum pressure side with respect to the valve body, the deformation of the valve body A pointer that receives and displaces, a pointer spring that biases the pointer toward the atmospheric pressure side so as to start displacing the pointer under a predetermined vacuum pressure, a pointer cylinder of a substantially transparent cylinder having the pointer therein, and a vacuum cleaner body. It is equipped with a communication pipe that airtightly connects the internal vacuum pressure section and the pointer cylinder, and a hollow, substantially frame-shaped pointer lid that covers the valve body from the atmospheric pressure side. The valve body is sandwiched between the pointer cylinder and the pointer lid. The dust collection amount display device of the electric vacuum cleaner which is formed by cutting off the vacuum pressure portion and the atmospheric pressure portion.