JP2018122296A - Dust collecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove an adhered matter adhering to a surface of an object to be cleaned.SOLUTION: In an adhered matter removing device, an accelerating device 73 comprises: a pressure accumulating part 71 in which pressurized gas is filled; a throttle part 73B for throttling an air flow discharged from the pressure accumulating part 71; an inflation part 73D for inflating an air flow jetting from a throat part 73C where a cross section of a flow channel is most contracted in the throttle part 73B; a valve part 73E for opening and closing the throat part 73C; and the like. The accelerating device accelerates the air flow to sonic velocity or more or to a subsonic velocity and jets the accelerated air flow toward a filter 3 object to be cleaned.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a deposit removing device that removes deposits attached to an object to be cleaned such as a filter.

  For example, the dust collector described in Patent Document 1 includes a substantially cylindrical filter. Dust and the like in the air (atmosphere) are removed by the filter and are accumulated while adhering to the surface of the filter.

  And in the dust collector of patent document 1, while providing a protruding piece in the inner side of a filter, and hitting the inner peripheral side of a filter with the said protruding piece, the dust etc. which adhered to the surface of the filter The deposit is removed.

JP 2010-89027 A

  An object of the present invention is to remove deposits by a novel method and configuration different from the deposit removal method described in Patent Document 1.

  The dust collector is, for example, a substantially cylindrical filter that removes dust from the taken-in atmosphere, and a filter that is closed at one end in the axial direction and an attached matter that removes dust adhering to the surface of the filter. A deposit removing device, and the deposit removing device is an accelerating device having a livestock pressure section filled with pressurized gas and an injection port for blowing gas toward the other end in the axial direction of the filter. And an accelerating device for accelerating the airflow to a sound speed or higher.

  The adhering matter removing device injects an airflow accelerated to an acoustic velocity or higher by an accelerating device from the other end in the axial direction of the filter into the filter, generates a shock wave by the airflow, and beats the filter by the shock wave. Thus, the acceleration device removes the adhering matter adhering to the filter, and the accelerating device restricts the airflow discharged from the stock pressure part, and the airflow ejected from the throat part where the channel cross-sectional area is reduced most among the constriction parts. An inflatable part to be inflated, a cylindrical part having a radius larger than the inner diameter dimension of the cylindrical part having an injection port at one end in the axial direction and a throat part at the other end in the axial direction And a valve portion that opens and closes the throat portion by being moved away from the other axial end of the cylindrical portion.

  The valve portion is disposed in the housing in a freely displaceable manner according to the difference between the pressure acting on the surface on the cylindrical portion side and the pressure acting on the surface opposite to the cylindrical portion across the valve portion. The space provided at the outer periphery of the cylindrical portion is moved away from and in contact with the pressure accumulating portion at all times.

  In a state where the valve portion is in contact with the other axial end of the cylindrical portion and the throat portion is closed, the same pressure as the pressure accumulating portion acts on the non-contact portion of the valve portion with the cylindrical portion. Furthermore, the valve part is provided with a valve for opening the throat part by separating the valve part from the other axial direction end of the cylindrical part while opening the opposite side of the cylindrical part to the atmosphere.

  Thereby, in the said dust collector, the deposit | attachment adhering to the surface of the cleaning target object can be removed.

It is sectional drawing which shows schematic structure of the dust collector 1 which concerns on embodiment of this invention. It is a figure which shows the structure of the filter 3 used for the dust collector 1 which concerns on embodiment of this invention. (A) is sectional drawing which shows schematic structure of the acceleration apparatus 73 used for the dust collector 1 which concerns on embodiment of this invention. (B) is AA sectional drawing of Fig.3 (a). It is operation | movement explanatory drawing of the acceleration apparatus 73 used for the dust collector 1 which concerns on embodiment of this invention. It is operation | movement explanatory drawing of the acceleration apparatus 73 used for the dust collector 1 which concerns on embodiment of this invention. It is operation | movement explanatory drawing of the acceleration apparatus 73 used for the dust collector 1 which concerns on embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  In the present embodiment, the deposit removing device according to the present invention is applied to a dust collector. The arrows and the like indicating the directions given to the drawings are described for easy understanding of the relationship between the drawings. The present invention is not limited to the directions given in the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “plurality”, “two or more”, and the like are omitted. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1. Outline of Dust Collection Device As shown in FIG. 1, the dust collection device 1 includes a filter 3, a dust collection casing 5, a deposit removing device 7, and the like. In addition, the dust collector 1 which concerns on this embodiment is an apparatus which capture | acquires the fine particle (henceforth dust etc.) which the metal vapor which generate | occur | produces at the time of laser processing or welding operation aggregated.

  The filter 3 filters dust in the air (atmosphere) in the dust collecting casing 5 to remove dust in the air. The filter 3 includes a cylindrical core material 3A made of punch metal, a filter paper material 3B folded in a bellows shape (see FIG. 2), and the like, and has a substantially cylindrical shape.

  Air containing dust or the like flows from the outer peripheral surface of the filter 3 toward the core member 3A. And when the said air passes the filter paper material 3B, dust etc. are capture | acquired by the filter paper material 3B. For this reason, in the filter 3 according to the present embodiment, the captured dust or the like is accumulated on the outer peripheral surface side of the filter 3.

  As shown in FIG. 1, the dust collection casing 5 constitutes a filter chamber 5 </ b> A that houses the filter 3. Air containing dust or the like is guided into the filter chamber 5A by an intake fan (not shown). The air filtered by the filter 3 (filter paper material 3B) flows through the core material 3A and is discharged out of the dust collector 1.

  In addition, the axial direction one end side (lower end side in this embodiment) of the filter 3 (core material 3A) is obstruct | occluded by the obstruction | occlusion body 3C. For this reason, the filtered air circulates in the filter 3 (core material 3A) from the axial direction one end side to the other end side, that is, from the lower end side to the upper end side.

2. 2. Adhering substance removing device 2.1 Outline of adhering substance removing device The adhering substance removing device 7 removes dust and the like adhering to the surface of the filter 3 (filter paper material 3B) which is an object to be cleaned. In other words, the deposit removing device 7 removes dust and the like, which are deposits, from the filter 3 by accelerating the air flow to a speed equal to or higher than the sound speed or to the subsonic speed and ejecting the accelerated air flow toward the filter 3.

2.2 Structure of the deposit removing device The deposit removing device 7 has at least a stock pressure section 71 and an acceleration device 73 as shown in FIG. The animal pressure part 71 is filled with pressurized gas. In the present embodiment, the animal pressure section 71 is filled with air pressurized to approximately 0.5 MPa by the pump P1.

  The acceleration device 73 accelerates the gas filled in the animal pressure part 71 and sprays it toward the filter 3. Specifically, as shown in FIG. 3A, the acceleration device 73 includes an injection port 73A, a throttle portion 73B, an expansion portion 73D, a valve portion 73E, and the like.

  The injection port 73A blows out the accelerated gas toward the filter 3. The injection port 73A according to the present embodiment is an opening that opens toward the other end side in the axial direction of the filter 3 (the upper end side in the present embodiment).

  The throttle unit 73B throttles the airflow released from the animal pressure unit 71 and accelerates the airflow. The throttle part 73B according to the present embodiment is an air passage configured on the outer peripheral side of the cylindrical part 73F, and is always in communication with the animal pressure part 71. The constricted portion 73B is configured by an air passage that guides air from the animal pressure portion 71 to the throat portion 73C and whose passage cross-sectional area decreases as it approaches the throat portion 73C.

  The cylindrical portion 73F is a cylindrical portion, and has an injection port 73A at one end in the axial direction (lower end in FIG. 3A) and a throat portion at the other end in the axial direction (upper end in FIG. 3A). 73C is provided.

  The throat portion 73C is a portion where the flow path cross-sectional area is reduced most in the throttle portion 73B. The throat portion 73C according to the present embodiment includes a plurality of small holes 73G (see FIG. 3B). The inflating portion 73D further accelerates the airflow by inflating the airflow ejected from the throat portion 73C.

  The valve portion 73E opens and closes the throat portion 73C. The valve portion 73E is configured by a disk-shaped diaphragm that is elastically deformed like a disc spring. The valve portion 73E has a larger radius than the inner diameter of the cylindrical portion 73F.

  And the said valve part 73E respond | corresponds to the difference of the pressure which acts on one surface (upper surface in Fig.3 (a)) and the pressure which acts on the other surface (lower surface in Fig.3 (a)) of the valve part 73E. Open and close the throat portion 73C.

2.2 Valve Unit Open / Close Operation As shown in FIG. 1, the upper surface side of the valve portion 73E can communicate with the pump P1 and the discharge side via the three-way valve V1. The three-way valve V1 includes (a) a case where the upper surface side space C1 of the valve portion 73E communicates with the pump P1, and a discharge side, (b) a case where the upper surface side space C1 is opened to the atmosphere, and (c) an upper surface side space C1. This is a switching valve for selecting one of the cases in which the is closed.

<When filling the animal pressure part with air>
When the three-way valve V1 is operated so that the upper surface side space C1, the pump P1, and the discharge side communicate with each other in a state where the pressure of the slaughter pressure portion 71 is lower than the discharge pressure of the pump P1, it acts on the upper surface side of the valve portion 73E. The force due to the pressure to exceed the force due to the pressure acting on the lower surface side of the valve portion 73E. For this reason, as shown in FIG. 4, the air supplied from the pump P1 flows through the clearance between the outer peripheral edge of the valve portion 73E and the housing 73H and flows into the animal pressure portion 71.

  The force due to the pressure acting on the upper surface side of the valve portion 73E is “pressure × the upper surface side area of the valve portion 73E”. The force due to the pressure acting on the lower surface side of the valve portion 73E is “atmospheric pressure × cross-sectional area of the throat portion 73C + pressure in the animal pressure portion 71 × (lower surface area of the valve portion 73E−cross-sectional area of the throat portion 73C)” It is.

<Animal pressure state>
When the pressure in the animal pressure part 71 becomes the same pressure as the discharge pressure of the pump P1, the three-way valve V1 is operated so that the upper surface side space C1 is sealed (see FIG. 5). As a result, the pressurized pressure portion 71 and the throttle portion 73B are filled with pressurized air, and the filled state is maintained.

  In the present embodiment, there is no pressure sensor or the like that detects whether or not the pressure in the animal pressure section 71 is the same as the discharge pressure of the pump P1. When a predetermined time (for example, 2 to 3 seconds) elapses from when the three-way valve V1 is operated so that the upper surface side space C1, the pump P1, and the discharge side communicate with each other, the pressure in the animal pressure unit 71 is increased. The three-way valve V1 is operated assuming that the pressure is the same as the discharge pressure of P1.

<When air is blown from the injection port>
The three-way valve V1 is operated so that the upper surface side space C1 is opened to the atmosphere. Thereby, since the force due to the pressure acting on the upper surface side of the valve portion 73E is less than the force due to the pressure acting on the lower surface side of the valve portion 73E, the valve portion 73E is separated from the throat portion 73C as shown in FIG. As the throat portion 73C opens, the valve portion 73E closes the air passage connected to the pump P1 side.

  And the airflow which ejected from the stock pressure part 71 flows into the valve part 73E side along the outer periphery of the cylindrical part 73F, and then flows into the expansion part 73D from the throat part 73C. The airflow that has flowed into the expansion portion 73D is blown out toward the filter 3 from the injection port 73A.

3. Features of the dust collector (particularly, the deposit removal device) according to the present embodiment In the acceleration device 73 according to the present embodiment, the airflow flowing out from the animal pressure unit 71 is throttled by the throttle unit 73B to increase the flow velocity. However, the throat portion 73C is reached. Since the airflow ejected from the throat portion 73C to the inflating portion 73D expands in the inflating portion 73D, it can be accelerated to a sound speed or higher or a subsonic speed.

  Therefore, a shock wave or an airflow having energy close to the shockwave (hereinafter referred to as “shockwave” including the airflow) is radiated from the injection port 73A to the filter 3. Therefore, since the filter 3 is struck by the shock wave, the adhering matter adhering to the cleaning object by the impact is dropped and removed from the cleaning object.

(Other embodiments)
In the above-described embodiment, the deposit removing device 7 according to the present invention is applied to the dust collecting device 1, but the application of the invention described in the present specification is not limited to this. For example, a deposit removing device for removing deposits adhering to the surface of a machine structure or a building, or a dust collector that collects dust such as metal powder or polishing dust generated during machining. Applicable.

  In other words, in the invention described in the present specification, the cleaning object is not limited to a so-called “filter”, and the deposit is also “fine particles in which metal vapor is agglomerated as exemplified in the above embodiment. It is not limited to.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Dust collector 3 ... Filter 3A ... Core material 3B ... Filter paper material 3C ... Closure body 5 ... Dust collection casing 5A ... Filter chamber 7 ... Adherent removal device 71 ... Accumulation pressure unit 73 ... Accelerator 73A ... Injection port 73B ... Restriction part 73C ... Throat part 73D ... Expansion part 73E ... Valve part

Claims (3)

In a dust collector that removes dust in the atmosphere,
A substantially cylindrical filter that removes dust from the taken-in atmosphere, the filter having one axial end closed;
A deposit removing device for removing deposits including dust adhered to the surface of the filter;
The deposit removing device is
An animal pressure section filled with pressurized gas;
An acceleration device having an injection port for blowing out the gas toward the other end side in the axial direction of the filter, comprising an acceleration device for accelerating the airflow to a sound speed or higher,
The adhering matter removing apparatus jets an airflow accelerated to a sound speed or higher by the acceleration device from the other axial end of the filter into the filter to generate a shock wave by the airflow, and the shock wave generates the shock wave. Remove the deposits attached to the filter by hitting it.
The accelerator is
A throttle part for restricting the airflow discharged from the animal pressure part,
An inflating portion for inflating an airflow ejected from a throat portion having a reduced flow path cross-sectional area among the throttle portions;
A cylindrical part having a larger radius than an inner diameter dimension of the cylindrical part, wherein the injection port is provided at one axial end and the throat part is provided at the other axial end. And having a valve portion that opens and closes the throat portion by separating and moving with respect to the other axial end of the cylindrical portion,
In a state where the valve portion is displaceably disposed in the housing, the difference between the pressure acting on the surface on the cylindrical portion side and the pressure acting on the surface opposite to the cylindrical portion across the valve portion is determined. In accordance with the displacement
The space provided on the outer periphery of the cylindrical portion is always in communication with the pressure accumulating portion,
In a state where the valve portion is in contact with the other axial end of the cylindrical portion and the throat portion is closed, the same pressure as the pressure accumulating portion acts on a non-contact portion of the valve portion with the cylindrical portion. And
Furthermore, a dust collector comprising a valve for opening the throat portion by opening the valve portion away from the other axial end of the cylindrical portion, with the valve portion opposite to the cylindrical portion being open to the atmosphere.   2. The dust collector according to claim 1, wherein, in a state where the throat portion of the acceleration device is closed, the other axial end of the cylindrical portion is in contact with a central portion of the valve portion. A pump for filling the pressure accumulating part with pressurized air, the discharge side comprising a pump capable of communicating with the side opposite to the cylindrical part of the valve part;
The dust collector according to claim 2, wherein the air supplied from the pump flows through the clearance between the outer peripheral edge of the valve portion and the housing, and then flows into the livestock pressure portion via the throttle portion.

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