JPH0832253B2 - 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 through a display window 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 bag 14, and the pointer 2 is displaced in proportion to the accumulated amount of dust. It had the drawback of not doing it.

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 is a thin-walled, substantially hat-shaped atmospheric pressure side 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 valve having a protruding portion on the vacuum pressure side with respect to the pointer valve,
Pointer A and Pointer B that are displaced by the deformation of the above-mentioned pointer valve and Pointer A and Pointer A so that the pointers A and B begin to displace under a predetermined vacuum pressure.
Of the pointer spring for urging the pointer to the atmospheric pressure side, a substantially transparent cylindrical body that slidably holds the pointer spring, the pointer A and the pointer B inside, and the vacuum pressure section and the inside of the pointer cylinder are hermetically connected. The guide tube is a thin wall of the pointer valve and the communication tube and the pointer valve are covered from the atmospheric pressure side and at the same time a hollow and substantially frame-shaped pointer lid that is fitted into the pointer cylinder and holds the pointer valve in an airtight manner is provided. It has a convex portion along the substantially hat-shaped portion, is arranged between the pointer and the pointer valve, and the pointer A and the pointer B are color-coded.

Action This action is to make the convex portion of the pointer B along the thin, substantially hat-shaped projection of the pointer valve, so that as the differential pressure of the atmospheric pressure increases, the pointer valve projection from the pointer A side has a cross section of approximately U. The deformation that inverts into a letter shape is generated smoothly, and the amount of inversion is gradually increased to change the displacement of the tip of the protrusion into the displacement of the pointer B. The pointer A and the pointer B are almost proportional to the accumulated amount of dust. In addition, the area of the pointer valve that receives the differential pressure directly and independently is minimized, and while maintaining the durability of the pointer valve sufficiently, the pressure fluctuation is accurately identified by the color coding of the pointer A and the pointer B. To convey to.

Embodiment An embodiment of the present invention will be described below 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 fitting so as not to shift in the radial direction of the pointer cylinder 30. The pointer B32 has a substantially cylindrical outer peripheral wall 38 and an inner peripheral convex portion 39. The inner peripheral convex portion 39 projects in the direction of the pointer lid 35, has a thin rubber elasticity of the pointer valve 36, and sticks closely to the projection 40 of the pointer valve 36 that projects in a hat shape in the direction opposite to the direction of the pointer A31. Have been inserted. Further, the pointer lid 35 has a substantially cylindrical shape and covers the protrusion 40 of the pointer valve 36 from the outer peripheral side. This central portion is open and communicates with the outside of the main body 21, and one end of the communication pipe 33 is inserted into a through hole 41 provided in the lower surface of the recess 28 to be attached to the dust collecting chamber 23.
Since it is communicated with, the atmospheric pressure acts on the pointer lid 35 side of the pointer valve 36, and the vacuum pressure generated by the operation of the electric blower 24 acts on the pointer B32 side.

Reference numeral 42 is a lid plate having a display window hole 43 above the pointer cylinder 30, and is fitted into the recess 28. When the electric blower 24 is not operating,
The pointer A31 can be seen through the display window hole 43.

 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, since the inner peripheral convex portion 39 of the pointer B32 is fitted into the protruding portion 40 of the pointer valve 36, the pointer A31 side portion is inverted between the inner peripheral convex portion 39 and the inner wall 37 to the communication pipe 33 side in a substantially U-shaped cross section. Then, the tip end position of the protrusion 40 moves to the communication pipe 33 side, and at the same time, the pointers A31 and B32 are displaced to the communication pipe 33 side.

When the suction force increases as the accumulation of dust increases, the substantially U-shaped inversion amount of the protrusion 40 of the pointer valve 36 gradually increases, and the pointers A31 and B32 gradually move to the communication pipe 33 side. . At this time, the green pointer A31 and the red pointer B32 are simultaneously visible from the display window hole 43. When the amount of dust exceeds a certain amount, the amount of displacement of the pointer A31 and the pointer B32 becomes maximum, and only the red pointer B32 can be seen from the display window hole 43, informing the user of the dust disposal time, and replacing the paper bag 22 with a new one. It will be exchanged with and will 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 protrusion 40 of the pointer valve 36 Even if the pointer A31 and the pointer B32 are displaced, the atmosphere does not flow into the dust collection chamber 23 through the pointer cylinder 30, and therefore the useless suction force is not reduced. Further, since the above-mentioned 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 inverted and deformed from the state where the vacuum pressure is low. The displacement movement of the pointer A31 and the pointer B32 within the area 43 can be gradually performed substantially in proportion to the decrease in pressure, and the user can recognize the dust accumulation amount more accurately than before.

In addition, the reverse deformation of the pointer valve 36 is caused by the inner convex portion 39 of the pointer B32.
Is aligned with the thin, generally hat-shaped protrusion 40 of the pointer valve 36, so that as the differential pressure between the atmospheric pressure and the vacuum pressure generated by the operation of the electric blower 24 increases, the pointer valve 36 The protrusion 40 is smoothly deformed so as to be inverted in a U-shaped cross section, and the amount of the inversion is gradually increased to change the displacement of the tip of the protrusion 40 into the displacement of the pointer B32. The pointers A31 and B32 can be displaced substantially in proportion to the magnitude of pressure.

In addition, the portion of the pointer valve 36 that directly receives the differential pressure only is the portion that is not in contact with the inner wall 37 and the inner peripheral convex portion 39, so that the strength and durability of the pointer valve 36 can be sufficiently secured and maintained. .

Further, since the pointers A31 and B32 are loaded by the pointer spring 34 and the pointer valve 36 so as to be in close contact with each other, the pointers A31 and B32 do not come off during displacement even if they are not particularly strongly coupled,
It can slide well in the pointer cylinder 30.

Effect of the Invention As described above, the present invention is a thin-walled, substantially hat-shaped indicator valve having a protrusion protruding toward the atmospheric pressure side that is deformed by the differential pressure between the vacuum pressure and the atmospheric pressure generated by the operation of an electric blower. , The pointer A and the pointer B, which are arranged on the vacuum pressure side with respect to the pointer valve and are displaced by the deformation of the pointer valve, and the pointer A and the pointer B are displaced under the predetermined vacuum pressure so that the pointer A is at the atmospheric pressure. A pointer spring that biases the spring toward the side, a substantially transparent cylindrical body that slidably holds the pointer spring, the pointer A, and the pointer B inside, and a communication pipe that hermetically connects the vacuum pressure portion and the inside of the pointer cylinder. And a hollow, substantially frame-shaped pointer lid which is fitted on the pointer cylinder at the same time as covering the pointer valve from the atmospheric pressure side and air-tightly holds the pointer valve.
Is a thin wall of the pointer valve and has a convex portion along the substantially hat-shaped portion, is arranged between the pointer A and the pointer valve, and the above-mentioned pointers A and B are color-coded so that the atmospheric pressure and the vacuum pressure are Along with the increase of the differential pressure, the pointer valve protrusion is smoothly deformed from the pointer A side to be inverted into a substantially U-shaped cross section, and gradually the amount of the inversion is increased to displace the tip of the protrusion to the displacement of the pointer B. The pointer A and the pointer B are displaced substantially in proportion to the amount of accumulated dust, and the area of the pointer valve that directly receives the differential pressure is minimized to ensure the durability of the pointer valve. It is something to maintain.

[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 ...... Pointer A, 32 ...... Pointer B, 33 ...... Communication pipe, 34 ...... Pointer spring, 35 ...... Pointer lid, 36 ...... Pointer valve, 37 ...... Inner wall, 39
…… Inner circumference convex part, 40 …… projection part.

Claims (1)

[Claims] 1. A pointer valve having a thin, substantially hat-shaped protrusion protruding toward the atmospheric pressure side, which deforms due to a pressure difference between a vacuum pressure and an atmospheric pressure generated by the operation of an electric blower, and the pointer valve. A pointer that is placed on the vacuum side and that is displaced by the deformation of the pointer valve
A, pointer B, and a pointer spring that biases the pointer A toward the atmospheric pressure side so that the pointer A and the pointer B start to be displaced under a predetermined vacuum pressure.
It is intended to cover the substantially transparent cylindrical body that slidably holds the pointer spring, the pointer A, and the pointer B inside, the communication pipe that airtightly connects the vacuum pressure portion and the inside of the pointer cylinder, and the pointer valve from the atmospheric pressure side. At the same time, it is provided with a hollow and substantially frame-shaped pointer lid which is fitted into the pointer cylinder and air-tightly holds the pointer valve, and the pointer B has a thin wall of the pointer valve and a convex portion along the substantially hat-shaped portion, A dust collection amount display device for an electric vacuum cleaner, which is disposed between the pointer A and the pointer valve, and the pointer A and the pointer B are color-coded.