JPH04327815A - vacuum cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Industrial Application Field] The present invention relates to a vacuum cleaner.
In particular, the present invention relates to a leak valve that is a device for preventing excessive temperature rise in an electric blower when a dust collection filter is clogged.

0003

[Prior Art] For example, when the dust collection filter in the dust collection chamber of a vacuum cleaner becomes clogged, the cooling of the electric blower becomes insufficient due to a decrease in air volume, and the temperature of this electric blower rises excessively. There is a risk of burning out the electric blower or thermal deformation of the vacuum cleaner body made of synthetic resin.

[0004] Therefore, in order to prevent such burnout of the electric blower and thermal deformation of the vacuum cleaner body, the vacuum cleaner is equipped with the following:
As a safety device, a leak valve is provided to let outside air into the electric blower in case the dust filter becomes clogged.

Conventionally, this type of leak valve is composed of a pipe body, a valve body, a spring body, and the like. The pipe body has one open end side communicating with the suction side of the electric blower and the dust collection filter, and a leak hole formed in the center of the other end side of the planar shape to allow outside air to flow through the pipe body. A valve body, such as a disk-shaped valve body with a planar contact surface, is slidably fitted into the pipe body, and the valve body is connected to the leak hole by a spring body. The structure is such that the inner surface of the leak hole and the abutting surface of the valve body come into close contact with each other, thereby closing the leak hole.

[0006] When the dust filter is not clogged, the pressure difference between the air pressure in the space between the dust filter and the electric blower and the outside air pressure is small, so the spring body Due to the biasing force, the valve body is pressed toward the leak hole and closes the leak hole. On the other hand, if the dust filter becomes clogged and the air pressure in the space between the dust filter and the electric blower decreases, and the pressure difference with the outside pressure exceeds a certain value, the valve body will spring up due to the atmospheric pressure. The leak hole is opened by moving toward the suction side against the biasing force of the body, and as a result, outside air flows from the leak hole into the gap between the inner peripheral surface of the pipe and the outer peripheral surface of the valve body, inside the pipe, etc. The air flows into the electric blower through the air blower and cools the electric blower.

[0007]

[Problems to be Solved by the Invention] The biasing force of the spring body of the leak valve is such that a pressure difference between the space between the dust collection filter and the electric blower and the outside air that causes an excessive temperature rise in the electric blower is generated. The leak hole is set to be released before it occurs.

However, in the above-mentioned conventional vacuum cleaner, since both the inner surface of the leak hole and the contact surface of the valve body that comes into contact with and separate from the leak hole are planar, the pressure difference becomes a predetermined value and the valve is closed. If the pressure difference increases to a certain extent even before the body is completely separated from the leak hole, the eccentricity of the load on the spring body and the rotational force of the spring body itself will cause the valve body to tilt and create a gap between the leak hole and the valve body. This causes outside air to flow in through this gap. In other words, the operation of the leak valve becomes unstable,
There is a problem in that a small amount of outside air flows in even though there is no need to take outside air into the electric blower from the leak valve, and the suction performance (suction power) during normal cleaning decreases.

[0009] The present invention was made in view of the above points, and can prevent burnout of the electric blower and thermal deformation of the vacuum cleaner body when the dust collection filter becomes clogged, and can reduce the suction work during normal cleaning. An object of the present invention is to provide a vacuum cleaner that can prevent a decrease in efficiency.

[Configuration of the invention]

[0011]

[Means for Solving the Problems] The vacuum cleaner of the present invention includes:
A vacuum cleaner body having an electric blower chamber and a dust collection chamber therein, an electric blower built in the electric blower chamber with a suction side communicating with the dust collection chamber, and a dust collection filter built in the dust collection chamber. The vacuum cleaner body includes a leak hole that communicates the suction side of the electric blower with the outside of the vacuum cleaner body, and a spherical contact surface provided on the suction side of the electric blower of the leak hole. The valve body is provided with a valve body that opens and closes the leak hole by bringing it into contact with and away from the inner edge opening of the leak hole, and a biasing means that brings the valve body into close contact with the inner edge opening of the leak hole.

0012

[Function] In the vacuum cleaner of the present invention, during cleaning, the electric blower is driven, and the dust that is sucked into the dust collection chamber along with the air is captured by the dust collection filter.

[0013] At this time, when the dust filter is not so clogged, the difference in pressure between the air pressure in the space on the suction side of the electric blower and the outside air pressure is small because the ventilation resistance is small. While this pressure difference is below a predetermined value that does not cause an excessive temperature rise in the electric blower, the urging force of the urging means causes the abutment surface of the valve body to move toward the inner edge opening of the leak hole. The leak hole is kept tightly closed.

[0014] Then, as the amount of trapped dust gradually increases, the ventilation resistance of the dust filter begins to increase, and the pressure difference between the air pressure in the space on the suction side of the electric blower and the outside air pressure increases. The valve body may tilt due to eccentricity of the load applied by the biasing means, but since the contact surface of the valve body is spherical, any part of the contact surface of the valve body and the leak The inner edge opening of the hole is held in close contact with the hole,
The leak hole is reliably kept closed.

On the other hand, when the dust filter becomes clogged, when the pressure difference reaches the set value due to increased ventilation resistance, the valve body moves against the urging force due to atmospheric pressure. The abutting surface of the valve body is separated from the inner edge opening of the leak hole, the leak hole is opened, and outside air flows into the electric blower.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the vacuum cleaner of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a vacuum cleaner body, and this vacuum cleaner body 11 includes a lower body case 12, an upper body case 13, and a lid body 1 that is freely openable and closable.
It consists of 4 etc. The inside of the vacuum cleaner main body 11 is divided into the front and back by a partition wall 17 having a ventilation hole 16, and the rear side of the partition wall 17 is an electric blower room 1.
8, and the front side of the partition wall 17 is the dust collection chamber 1.
It's 9.

In the electric blower chamber 18, an electric blower 21 is mounted on support walls 22a, 23a, 22b, 23b, 22c formed on both main body cases 12, 13.
, 23c via annular rubber supports 24 and 25. The electric blower 21 has annular front support walls 22a and 23a and a rubber support 24, so that the suction side, which has a negative pressure when the electric blower 21 is activated, and the outlet side, which has a positive pressure when it is activated, are airtight. The suction side connects to the dust collection chamber 19 through the ventilation port 16.
is connected to. Further, the blowing side of the electric blower 21 communicates with an exhaust port 26 formed in the rear surface of both the main body cases 12 and 13.

Further, the dust collection chamber 19 has an opening on its upper surface that is closed by the lid 14 so as to be openable and closable. Note that a seal packing 31 is provided at the periphery of this opening to maintain airtightness by interposing it with the closed lid 14.
is provided. A paper bag filter 32 serving as a dust collecting filter is removably mounted in the dust collecting chamber 19 with a clamp 33 or the like, and is replaced as needed through an opening on the top surface of the dust collecting chamber 19.

[0020] Also, facing the dust collection chamber 19, the lid body 1
4 has a suction port 3 that communicates the dust collection chamber 19 with the outside.
8 is formed with an opening.

One end of a suction hose (not shown) is removably inserted into the suction port 38, and a suction port body is connected to the other end of the hose via an extension pipe. It is designed to be freely connected.

The lid body 14 also has a device housing section 4 which has an open top surface and whose top surface opening is covered by an upper cover 41.
2 is formed, and the inside of this device housing part 42 communicates with the outside air outside the cleaner main body 11 through a gap formed between the lid body 14 and the upper cover 41. The lower surface of the device storage section 42 faces the negative pressure space 44 between the paper bag filter 32 and the partition wall 17 of the dust collection chamber 19 provided on the suction side of the electric blower 21. A suction portion 48 is formed. This suction part 4
8 is formed with a protrusion 49 facing upward in the center, and a plurality of openings 50 are formed around this protrusion 49 to communicate the inside of the device housing section 42 and the negative pressure space 44, and furthermore, these openings An annular flange portion 51 is provided to surround the portion 50 and protrude in the vertical direction.

A leak valve 55 (as an overtemperature rise prevention device) is installed above the suction section 48 in the device storage section 42.
air protector) is installed.

This leak valve 55, as shown in FIG.
It is composed of a cylinder body 56, a valve body 57, a spring body 58 as a biasing means, and a seal body 59.

The seal body 59 has a cylindrical shape with an annular flange 61 protruding near the lower end of the inner peripheral surface, and the lower surface of the flange 61 and the inner peripheral surface below the flange 61. is fitted into the upper part of the flange part 51 of the suction part 48, and the upper surface of this flange part 61 and the inner circumferential surface above this flange part 61 are fitted into the cylinder body 56, and this seal body 59 As a result, the cylinder body 56 is attached to the suction portion 48 in close contact.

The cylinder body 56 has a substantially cylindrical shape, and its open lower end side communicates with the negative pressure space 44 through the opening 50 of the suction portion 48 . On the other hand, a circular leak hole 63 is formed in the center of the upper end surface of the cylinder body 56 and communicates with the outside air via the device housing section 42 .

Furthermore, the inner edge opening 64 of this leak hole 63
An annular flange portion 66 is provided to protrude downward, and the lower end of this flange portion 66 serves as a planar seal portion 67 . Note that by attaching a seal member made of rubber or the like to this seal portion 67, airtightness can be further improved.

The valve body 57 is shown in FIGS. 2 and 3.
As shown in the figure, a plurality of vertical guide protrusions 70 are provided on the outer peripheral surface.
It is fitted concentrically into the cylinder body 56, and maintains a constant gap between the inner surface of the cylinder body 56 and the outer peripheral surface of the valve body 57 by the guide protrusion 70. It is designed to be able to freely slide up and down. Further, on the upper surface portion 72 of the valve body 57 that contacts the seal portion 67, an annular contact surface 73 in the shape of a part of a sphere cut out with two parallel planes is provided concentrically with the leak hole 63. A spring body 58 is formed on the lower surface.
An annular recess 74 is formed in which the upper end of the recess 74 engages.

The spring body 58 is mounted such that its upper end is engaged with the recess 74 of the valve body 57 and its lower end is fitted into the protrusion 49 provided at the center of the suction section 48. There is. When the paper bag filter 32 is not clogged, the pressure difference between the atmospheric pressure in the negative pressure space 44 between the paper bag filter 32 and the electric blower 21 and the outside atmospheric pressure is small. Due to the biasing force of the body 58, the valve body 57 is positioned upward, and the contact surface 73 of the valve body 57 comes into close contact with the seal portion 67, thereby closing the leak hole 63. On the other hand, if the paper bag filter 32 or the like becomes clogged and the pressure difference between the atmospheric pressure in this negative pressure space 44 and the external atmospheric pressure increases and exceeds a certain value, the external pressure causes the valve body 57 to
moves downward, the leak hole 63 is opened, and the outside air
From the leak hole 63, the inner peripheral surface of the cylinder body 56 and the valve body 5
The air flows into the electric blower 21 through the gap between the air blower 7 and the outer circumferential surface of the air blower 7, the inside of the cylinder body 56, the opening 50 of the suction part 48, and the like.

Next, the operation of the above embodiment will be explained.

During cleaning, by driving the electric blower 21, for example, dust is sucked in together with air from the suction port body.
Dust collection chamber 1 of vacuum cleaner main body 11 via extension pipe and hose
9 and captured within the paper bag filter 32. Moreover, the air filtered by this paper bag filter 32 is
The air passes through the negative pressure space 44, the ventilation port 16, the inside of the electric blower 21, and the inside of the electric blower chamber 18 in this order, and is discharged to the outside of the cleaner body 11 from the exhaust port 26.

At this time, the amount of dust trapped and stored in the paper bag filter 32, that is, the amount of dust collected, is still small.
When the paper bag filter 32 is not so clogged, the negative pressure space 44 has little ventilation resistance.
The pressure difference between the internal pressure and the external pressure is small. While this pressure difference is below a predetermined value that does not cause an excessive temperature rise in the electric blower 21, the contact surface 73 of the valve body 57 is pressed against the seal portion 67 by the biasing force of the spring body 58. The valve body 57 keeps the leak hole 45 reliably closed.

Then, as the amount of trapped dust gradually increases, the ventilation resistance of the paper bag filter 32 begins to increase, and as a result, when the pressure difference between the atmospheric pressure inside the negative pressure space 44 and the outside atmospheric pressure increases to a certain extent, The urging force of the spring body 58 is reduced by the atmospheric pressure. In this case, the valve body 57 may be tilted due to the eccentricity of the load on the spring body 58 due to atmospheric pressure or the rotational force of the spring body 58 itself, but since the contact surface of the valve body 57 is spherical, Contact surface 7 of valve body 57
3 and the seal portion 67 are kept in close contact with each other, and the leak hole 45 is kept reliably closed by the valve body 57. Therefore, at the stage where the leak valve 55 should still be closed, the inflow of outside air can be prevented and the suction performance (suction power) during normal cleaning can be maintained.

On the other hand, when the amount of dust collected increases and the paper bag filter 32 becomes clogged, or when the suction port or the end of the hose is clogged with large objects, the suction port or the end of the hose becomes clogged. When the pressure difference between the air pressure inside the negative pressure space 44 and the outside air pressure increases due to an increase in ventilation resistance, and reaches the set value, the valve body 57 is forced downward due to the outside air pressure. , the leak hole 63 is opened, and outside air flows from the leak hole 63 into the gap between the inner peripheral surface of the cylinder body 56 and the outer peripheral surface of the valve body 57, and into the cylinder body 56.
The air flows into the electric blower 21 through the inside and the opening 50 of the suction section 48 . This prevents an excessive temperature rise in the electric blower 21 due to a decrease in air volume, and prevents burnout of the electric blower 21 and thermal deformation of the main body cases 12 and 13 made of synthetic resin.

[0035] While the negative pressure is above the set value,
The valve body 57 is held in this open state.

In addition, the suction port body, the end of the hose, etc. are temporarily blocked, and the valve body 57 moves downward, causing the leak hole 63 to close.
When the suction port body, the end of the hose, etc. are opened, the pressure difference between the atmospheric pressure inside the negative pressure space 44 and the outside atmospheric pressure decreases, but when this pressure difference reaches the set value, The valve body 57 moves upward due to the urging force of the spring body 58,
The leak hole 45 is closed.

According to the above structure, even if the valve body 57 is tilted due to eccentricity of the spring body 58, the leak valve 55 operates stably, and the leak valve 55 is operated stably, and the leak valve 55 is operated stably, and the leak valve 55 is operated stably, and the leak valve 55 is operated stably. While the pressure difference between the atmospheric pressure inside the negative pressure space 44 and the outside atmospheric pressure is below the set value, the leak hole 45 is reliably kept closed, and the electric blower 21 is released from the leak hole 45.
No outside air will flow inside. That is, unlike conventional leak valves, outside air does not flow into the electric blower 21 before the pressure difference reaches a set value and the leak hole 45 is completely opened, and the suction work during normal cleaning is reduced. This will not cause a decrease in the rate.

[0038]

[Effects of the Invention] According to the vacuum cleaner of the present invention, when cleaning,
By driving the electric blower, the dust sucked into the dust collection chamber together with the air is captured by the dust collection filter.

[0039] At this time, as long as the pressure difference between the air pressure in the space on the suction side of the electric blower and the outside air pressure is below a set value determined to prevent the electric blower from causing an excessive temperature rise,
The contact surface of the valve body is held in close contact with the inner edge opening of the leak hole, and the leak hole is held in a reliably closed state.

[0040] Even if the valve body is tilted, since the contact surface of the valve body is spherical, any part of the contact surface of the valve body and the inner edge opening of the leak hole will not come into close contact. This state is maintained, the leak hole is reliably closed, and high suction performance (suction power) can be maintained.

On the other hand, when the dust filter becomes clogged, the pressure difference between the air pressure in the space on the suction side of the electric blower and the outside air pressure increases, and when this pressure difference reaches a predetermined value,
The valve body is separated from the inner edge opening of the leak hole due to the external pressure, the leak hole is opened, and outside air flows into the electric blower. This prevents an excessive temperature rise in the electric blower due to a decrease in air volume, and prevents burnout of the electric blower and thermal deformation of the main body case made of synthetic resin.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a vacuum cleaner of the present invention.

FIG. 2 is a longitudinal sectional view showing the leak valve same as above.

FIG. 3 is a perspective view showing the same valve body.

[Explanation of symbols]

11 Vacuum cleaner body 18 Electric blower chamber 19 Dust collection chamber 21 Electric blower 32 Paper bag filter 5 as a dust collection filter
7 Valve body 58 Spring body 63 as biasing means
Leak hole 64 Inner edge opening 73 Contact surface

Claims (1)

[Claims] 1. A vacuum cleaner body having an electric blower chamber and a dust collection chamber therein, an electric blower built in the electric blower chamber with a suction side communicating with the dust collection chamber, and an electric blower built in the dust collection chamber. The vacuum cleaner body includes a leak hole that communicates the suction side of the electric blower with the outside of the vacuum cleaner body, and a spherical surface provided on the suction side of the electric blower of the leak hole. A valve body that opens and closes the leak hole by bringing a shaped contact surface into contact with and away from the inner edge opening of the leak hole, and a biasing means that brings the valve body into close contact with the inner edge opening of the leak hole. A vacuum cleaner with special features.