JP2014108177A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by eliminating malfunction of water level sensors.SOLUTION: In a dust collector, a body 5 storing an air intake unit and having filters on the upstream side is placed on a tank having a suction port so as to suck outer air or water from the suction port by the operation of the air intake unit, and also a pair of electrodes 70, 70 for detecting the level of water stored in the tank are arranged by projection on the lower surface of the body 5. A guard plate 67 for performing partitioning between the suction port and filter units is arranged on the lower surface of the body 5. The electrodes 70, 70 are arranged on a surface on the opposite side of the suction port in the guard plate 67.

Description

  The present invention relates to a dust collector provided with a water level sensor.

The dust collector has a built-in air intake unit equipped with a motor and a suction fan on the top of a tank with a suction port. The intake fan can be sucked in from the suction port by the rotation of the suction fan driven by the motor. It is said. A filter is interposed between the suction port and the intake unit, and the dust sucked together with the outside air can be captured by the filter.
Some of these dust collectors can also suck in water containing dust. In this case, the water level sensor is provided and the operation is stopped when the water in the tank reaches a certain level. I am doing so. As this water level sensor, as disclosed in Patent Document 1, for example, a pair of electrodes electrically connected to the water level detection circuit of the control circuit is provided in the tank, and when the water level reaches the electrodes and the electrodes are energized, the water level detection A control circuit that detects this in a circuit is known to stop driving the motor.

JP 2009-165749 A

  However, in the above conventional dust collector, water sucked from the suction port before reaching a certain water level comes into contact with the electrodes, so that there is a possibility that the electrodes are accidentally energized and the water level sensor malfunctions.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a dust collector having high reliability by eliminating malfunction of a water level sensor.

In order to achieve the above object, according to the first aspect of the present invention, an air intake unit is accommodated in an upper part of a tank having a suction port, and a main body provided with a filter is placed on the upstream side of the air intake unit. The dust collector is provided with a pair of electrodes protruding from the lower surface of the main body to detect the water level stored in the tank, and the suction port and the lower surface of the main body. A guard plate for partitioning the filter is provided, and at least one of the electrodes is provided on the surface of the guard plate opposite to the suction port.
According to a second aspect of the present invention, in the configuration of the first aspect, the electrode is a sheet metal.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the electrode provided on the guard plate is supported while being floated from the surface of the guard plate.
The invention according to claim 4 is characterized in that, in the structure according to any one of claims 1 to 3, a pair of electrodes are provided on the guard plate, and a notch or a slit is provided on the guard plate between the electrodes. It is.

According to invention of Claim 1, while providing the guard board which partitions off between a suction inlet and a filter in the lower surface of a main body, at least one of the electrodes was provided in the surface on the opposite side to the suction inlet in a guard board. Thus, the malfunction of the water level sensor can be eliminated and the reliability can be improved. Further, since the guard plate that protects the filter is also used as the electrode mounting member, the number of parts can be reduced, leading to space saving and cost reduction.
According to the second aspect of the invention, in addition to the effect of the first aspect, since the electrode is a sheet metal, a special terminal is not required and the water level sensor can be configured at low cost.
According to the third and fourth aspects of the invention, in addition to the above effects, it is possible to more reliably eliminate the possibility that the water level sensor malfunctions before the electrodes are submerged by water droplets attached to the guard plate.

It is a longitudinal cross-sectional view of the front-back direction of a dust collector. It is a longitudinal cross-sectional view of the left-right direction of a dust collector. It is an enlarged view of the filter unit part in FIG. It is the perspective view which looked at the filter unit from the upper part. It is the perspective view which looked at the filter unit from the lower part. It is the perspective view which looked at the main body from the lower part (lever standing state). It is a side view of a main body (lever standing state). It is an enlarged view of the clamp plate and lever part in FIG. It is a rear view of the main body which shows the state before clamp of a filter unit. It is a rear view of the main body which shows the clamp state of a filter unit. It is the perspective view which looked at the main body from the lower part. It is a perspective view of a guard plate. It is explanatory drawing of a guard board, (A) shows the longitudinal cross-section of an electrode part, (B) shows a front, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view in the front-rear direction showing an example of a dust collector, and FIG. 2 is a longitudinal sectional view in the left-right direction. The dust collector 1 includes a tank 4 having an upper surface opened on a traveling platform 2 having wheels 3 and 3, and a main body 5 having an intake unit 6 placed on the tank 4. A suction port 7 to which a dust collecting hose can be connected is formed on the front side (left side in FIG. 1) of the tank 4.
The main body 5 is configured such that the tank 4 can be closed by disposing the intake unit 6 substantially at the center and locking the partition plate 8 provided at the lower part to the opening of the tank 4. The central portion of the partition plate 8 is a projecting portion 9 projecting downward in a bottomed cylindrical shape, and an air inlet 10 is formed at the center of the lower surface of the projecting portion 9.

The intake unit 6 is disposed so as to protrude into the protruding portion 9 at the center of the main body 5. The intake unit 6 includes an upper case 11, a lower case 12, and an intermediate case 13 interposed between the upper case 11 and the lower case 12. Between the upper case 11 and the intermediate case 13, the motor 14 is held in a posture with the output shaft 15 facing downward, and is supported on the lower end of the output shaft 15 that is pivotally supported by the intermediate case 13 and protrudes into the lower case 12. The suction fan 16 is fixed. Further, an air inlet 17 facing the air inlet 10 is formed on the lower surface of the lower case 12, and a plurality of air outlets 18, 18.
Further, a support plate 19 fixed to the upper surface of the partition plate 8 is connected to the lower portion of the upper case 11, and a cowling 20 having a handle 21 on the upper surface is attached to the upper portion of the support plate 19. ing. On the front surface of the cowling 20, there is provided an operation unit 22 that includes an operation switch, an outlet, and the like and is electrically connected to a controller (not shown).

An intake case 23 is screwed to the lower surface of the partition plate 8. As shown in FIG. 2, a pair of openings 24, 24 positioned on the left and right sides of the intake unit 6 are formed on the lower surface of the intake case 23, and the openings 24, 24 are formed inside the intake case 23. A pair of intake passages 25, 25 are formed in communication with each other. Further, a bulging portion 26 projects in the front-rear direction between the openings 24, 24 on the lower surface of the intake case 23, and a central passage communicating with the intake port 10 of the protruding portion 9 in the bulging portion 26. 27 is formed. The central passage 27 is connected to the intake passages 25, 25 behind the intake unit 6.
Further, an exhaust passage 28 communicating with the air outlet 18 of the lower case 12 is formed in the main body 5 above the partition plate 8 and communicates with an exhaust port 29 provided in the support plate 19.

  However, the partition plate 8 is formed with a pair of communication passages (not shown) that communicates the downstream side of the exhaust passage 28 with the intake passages 25, 25. In each communication passage, the exhaust passage 28 and the communication passage are normally connected. An opening / closing member 30 is provided to close the space between the central passage 27 and the intake passage 25. A cam 32 that rotates by a DC motor 31 is provided between the opening and closing members 30. The opening / closing member 30 is operated by the turning motion of the cam 32 accompanying the driving of the DC motor 31, thereby opening the space between the exhaust passage 28 and the communication passage and closing the space between the central passage 27 and the intake passage 25. The exhaust gas from the exhaust passage 28 can be led back from the communication passage to the intake passage 25.

  On the other hand, a pair of filter units 33 and 33 are attached to the positions of the openings 24 on the lower surface of the intake case 23. As shown in FIGS. 3 to 5, the filter unit 33 has an opening of a primary filter 35 made of a bottomed cylindrical cloth attached to a trapezoidal attachment plate 34 larger than the opening 24, and the primary filter 35. A secondary filter 36 made of polyurethane sponge is accommodated in a cylindrical shape inside, and a paper-made tertiary filter 37 folded and folded is accommodated inside the secondary filter 36. An oval outlet 38 communicating with the inside of the tertiary filter 37 is formed at the center of the mounting plate 34. On the outer surface of the mounting plate 34, an oval inner rib 39 smaller than the opening 24 and an oval outer rib 40 larger than the opening 24 protrude from the periphery of the outlet 38, and both ribs 39, A sealing material 41 is provided between 40.

  Further, a belt-like outer frame 42 is formed on the outer periphery of the mounting plate 34, and a large outer rib 43 having the same height as the inner rib 39 and the outer rib 40 on the outer surface of the mounting plate 34 inside the outer frame 42. Projectingly, and the outer rib 40 and the large outer rib 43 are connected by wall ribs 44, 44,. In the outer frame 42, quadrangular insertion pieces 45, 45 project in the opposite direction to the mounting side of the primary filter 35 at the peripheral edges facing the outlet 38 in the longitudinal direction. Furthermore, a locking piece 46 and a clamp rail 47 are provided on the outer periphery of the outer frame 42 that are opposed to each other across the outlet 38 in the short direction. The locking piece 46 is L-shaped with the tip protruding in the same direction as the insertion piece 45 on the short side of the outer frame 42, and a through hole 48 is formed at the tip. The clamp rail 47 is formed in a U-shaped cross section toward the attachment side of the primary filter 35 along the long side of the outer frame 42.

  On the other hand, as shown in FIG. 6, in the intake case 23, holes 49 and 49 into which the insertion pieces 45 and 45 can be inserted in the attached state of the filter unit 33, and the filter unit 33, as shown in FIG. The protrusions 50 and 50 that can be fitted inside the large outer rib 43 in the attached state are formed. Further, as shown in FIG. 7, a cutout portion 51 into which the locking piece 46 can enter is formed on the outer edge of the intake case 23, and a through hole 48 of the locking piece 46 is formed in the cutout portion 51. A locking projection 52 that can be fitted to the projection is provided.

  A clamp plate 53 and a lever 54 for fixing the filter units 33 and 33 are provided between the openings 24 and 24 on the lower surface of the intake case 23. First, the clamp plate 53 is a U-shaped plate body that straddles the bulging portion 26. As shown in FIG. 8, the clamp plate 53 protrudes downward in front of the bulging portion 26 and has a base portion with a large diameter. 55 is inserted into the bottomed hole 57 at the center of the circular protrusion 56 formed on the front back surface of the clamp plate 53, and the rear protrusion 58 protruding on the bulging portion 26 is inserted into the rear side of the clamp plate 53. It is made to insert in the bottomed hole part 59 formed in the back surface. Accordingly, the clamp plate 53 is supported below the bulging portion 26 so as to be movable in the vertical direction in parallel with the lower surface of the intake case 23. However, the front coil spring 60 that is sheathed by the front projection 55 and interposed between the front projection 55 and the circular projection 56, the bottom surface of the bulging portion 26 that is sheathed by the rear projection 58, and the back surface of the clamp plate 53 The clamp plate 53 is urged downward from the bulging portion 26 by the rear coil spring 61 interposed therebetween.

  A support rod 62 is provided on the bulging portion 26 between the front projection 55 and the rear projection 58 and protrudes downward through the clamp plate 53. A lever is provided at the tip of the support rod 62. 54 are connected. The lever 54 is a U-shaped plate having a narrower left-right width than the clamp plate 53, and one end of the lever 54 is rotatably connected to the tip of the support bar 62 by a left-right shaft 63. 64 and 64 are brought into contact with the lower surface of the clamp plate 53. The front ends of the pressing plates 64, 64 have a cam shape in which the distance from the peripheral edge to the shaft 63 changes. That is, here, as shown in FIGS. 6 and 7, the distance between the shaft 63 and the periphery of the pressing plate 64 in the vertical direction is the shortest with the lever 54 standing downward, and the lever 54 is moved to the clamp plate 53 side from there. The distance between the shaft 63 and the peripheral edge of the pressing plate 64 is gradually increased as the pressure is gradually lowered. A groove 65 into which the pressing plates 64 and 64 are fitted is formed in the lower surface of the clamp plate 53.

  Therefore, when the lever 54 is erected downward, the clamp plate 53 urged downward by the front and rear coil springs 60 and 61 is at a lower position farthest from the bulging portion 26 as shown in FIGS. . On the other hand, in a state where the lever 54 is laid down along the clamp plate 53, the clamp plate 53 is shown in FIGS. 3 and 8 against the urging of the front and rear coil springs 60 and 61 by the pressing of the press plates 64 and 64. In the upper position closest to the bulging portion 26. Here, the clamp rails 47 and 47 of the left and right filter units 33 and 33 set on the lower surface of the intake case 23 are positioned above the left and right side plate portions 66 and 66 of the clamp plate 53, respectively. In the position, the left and right side plate portions 66, 66 are fitted to the left and right clamp rails 47, 47, respectively.

A guard plate 67 is provided between the clamp plate 53 and the suction port 7 on the lower surface of the intake case 23. The guard plate 67 is a plate body that partitions the gap between the clamp plate 53 and the suction port 7 at substantially the same height as the filter unit 33, and as shown in FIG. By screwing to the bottom of the intake case 23, it protrudes downward in a direction orthogonal to the lower surface of the intake case 23. A blowing cylinder 69 that protrudes into the tank 4 and curves downward is attached to the suction port 7, and the center of the guard plate 67 has a shape that bulges backward to prevent interference with the blowing cylinder 69. Yes.
Electrodes 70 are provided on both the left and right sides of the guard plate 67 on the clamp plate 53 side. The electrode 70 is a belt-like sheet metal that is electrically connected to a water surface detection circuit provided in the controller. When the water stored in the tank 4 reaches the electrodes 70 and 70 and is energized between the electrodes 70 and 70, the electrode 70 Operation is stopped (water level sensor).

As shown in FIGS. 12 and 13, the electrode 70 is supported in parallel with the guard plate 67 while being slightly lifted from the surface of the guard plate 67 by a boss 71 protruding from the guard plate 67. On the surface of the guard plate 67, a plurality of protrusions 72, 72,...
In addition, a notch 73 extending upward beyond a line connecting the tips of the electrodes 70 is formed at the center of the tip of the guard plate 67.

  In the dust collector 1 configured as described above, when the filter unit 33 is attached to the main body 5, as shown in FIG. 9, the filter unit 33 is placed on the intake case 23 of the main body 5 turned upside down with the lever 54 raised. 33 and 33 are set. That is, the insertion piece 45 is inserted into the hole 49 while the engagement piece 46 of the filter unit 33 enters the notch 51 of the intake case 23 and the engagement projection 52 is fitted into the through hole 48. The protrusion 50 is fitted inside the rib 43. Then, the filter unit 33 is positioned on the intake case 23 and the outlet 38 faces the opening 24. A rib 24a is provided on the periphery of the opening 24 so as to be pressed by the sealing material 41 on the outlet 38 side (FIG. 3). At this time, the left and right clamp rails 47 and 47 are positioned below the side plate portions 66 and 66 of the clamp plate 53, respectively.

  In this state, when the lever 54 is tilted toward the clamp plate 53, the clamp plate 53 pressed by the press plates 64 and 64 of the lever 54 resists the bias of the front and rear coil springs 60 and 61 as shown in FIG. The side plate portions 66 and 66 are pressed by the clamp rails 47 and 47. That is, the clamp rails 47 and 47 of the left and right filter units 33 and 33 are simultaneously clamped, and the filter units 33 and 33 are fixed at a time. As shown in FIG. 8, a cylindrical portion 74 holding a nut 75 is formed at the rear end of the clamp plate 53, and the lever 54 has a boss portion 76 that coaxially overlaps the cylindrical portion 74 in a lying state. Is formed. Therefore, if a screw is inserted from the boss portion 76 and screwed into the nut 75, the lying lever 54 is fixed to the clamp plate 53, and the lever 54 is prevented from accidentally rotating to the standing side. It has become.

  When the main body 5 to which the filter units 33 and 33 are fixed is placed on the tank 4 and the operation switch is turned on, the motor 14 is driven and the suction fan 16 rotates. Then, outside air is sucked into the tank 4 from the suction port 7 through the dust collecting hose, passes through both filter units 33 and 33, enters the main body 5 from the openings 24 and 24, and the intake passages 25 and 25. Passes through the intake passage 6 through the central passage 27 and is discharged from the exhaust port 29 through the exhaust passage 28. Due to the air flow, the dust sucked together with the air is captured by the filter units 33 and 33 and stored in the tank 4.

  Here, when the DC motor 31 is driven by the operation of the operation unit 22, the cam 32 pivots as described above, and the opening / closing member 30 operates alternately, whereby the exhaust from the exhaust passage 28 is alternately passed from the communication passage. Then, the air can be led back to the intake passage 25 and backflowed. The exhaust gas that has flowed backward passes through the filter unit 33, so that dust attached to the filter unit 33 can be blown away to clean the filter unit 33. The exhaust gas that has flowed back passes through the filter unit 33 on the opposite side and enters the main body 5 and is discharged.

  Then, water containing dust is sucked in from the suction port 7 through the dust collecting hose and stored in the tank 4, and when the raised water level reaches the electrodes 70, 70, the water level sensor described above works to stop the operation. Will do. Here, since the electrodes 70 and 70 are provided on the surface of the guard plate 67 opposite to the suction port 7, the sucked water contacts the electrodes 70 and 70 and accidentally energizes the electrodes 70 and 70. There is no fear and malfunction of the water level sensor can be prevented. In particular, since the electrodes 70 and 70 are supported in a state of floating from the guard plate 67 and a notch 73 is formed at the tip of the guard plate 67 between the electrodes 70 and 70, the electrodes 70 and 70 are attached to the guard plate 67. There is no risk of accidental energization between the electrodes 70 due to the water droplets. Further, the protrusions 72 around the electrode 70 make it difficult for water droplets on the guard plate 67 to adhere to the electrode 70.

  When removing the filter units 33, 33, the lever 54 is raised from the lying state. Then, the clamp plate 53 released from the pressing by the pressing plates 64 and 64 is separated from the clamp rails 47 and 47 by the urging of the front and rear coil springs 60 and 61, so that each filter unit 33 can be removed from the intake case 23.

  Thus, according to the dust collector 1 of the said form, while providing the guard board 67 which partitions between the suction inlet 7 and the filter unit 33 in the lower surface of the main body 5, the surface on the opposite side to the suction inlet 7 in the guard board 67 is provided. Further, by providing the electrodes 70, the malfunction of the water level sensor can be eliminated and the reliability can be improved. In addition, since the guard plate 67 that protects the filter unit 33 is also used as an attachment member for the electrode 70, the number of components can be reduced, leading to space saving and cost reduction.

Particularly, since the electrode 70 is a sheet metal, a special terminal is not required and the water level sensor can be configured at low cost.
Further, since the electrode 70 provided on the guard plate 67 is supported while being floated from the surface of the guard plate 67, or the notch 73 is provided in the guard plate 67 between the electrodes 70, 70, the guard plate 67 is provided. It is possible to more reliably eliminate the possibility that the water level sensor malfunctions before the electrode 70 is submerged due to water droplets attached to the surface.

In the above embodiment, both the pair of electrodes are provided on the guard plate, but only one of them may be provided on the guard plate.
Moreover, the attachment form of the electrode to the guard plate can be attached so as not to float from the guard plate, and the protrusions can be omitted.
Further, a slit may be provided in place of the notch, and the notch and the slit may be omitted.
In addition, the configuration of the dust collector excluding the guard plate is not limited to the above form. For example, in the above embodiment, a pair of filter units are provided and the filter units are automatically cleaned by the backflow of exhaust gas. However, the present invention is not limited to this, and a dust collector equipped with a single filter unit without having an automatic cleaning function. However, the present invention is applicable.

  1 .... Dust collector, 4 .... Tank, 5 .... Main body, 6 .... Air intake unit, 7 .... Suction port, 8 .... Partition plate, 14 .... Motor, 15 .... Output shaft, 16 .... Suction fan, 23 ..Intake case, 24 ..Opening part, 26 ..Expanded part, 33 ..Filter unit, 34 ..Mounting plate, 38 ..Outlet, 45 .. Insert piece, 46. 47 .. Clamp rail, 48.. Through hole, 49 ... Hole part, 51 ... Notch, 52 ... Locking projection, 53 ... Clamp plate, 54 ... Lever, 60 ... Front coil spring, 61 ... · Rear coil spring, 63 · · shaft, 64 · · pressing plate, 66 · · side plate portion, 67 · · guard plate, 70 · · electrode, 71 · · boss, 72 · · ridge, 73 · · notch.

Claims (4)

On the upper part of the tank having the suction port, a main body with a suction unit and a filter provided on the upstream side of the tank is placed, and the operation of the suction unit makes it possible to suck outside air or water from the suction port. A dust collector in which a pair of electrodes for detecting the water level stored in the tank is provided on the lower surface of the main body,
A guard plate for partitioning the suction port and the filter is provided on the lower surface of the main body, and at least one of the electrodes is provided on a surface of the guard plate opposite to the suction port. Dust collector.   The dust collector according to claim 1, wherein the electrode is a sheet metal.   The dust collector according to claim 1 or 2, wherein the electrode provided on the guard plate is supported in a state of being floated from a surface of the guard plate.   The dust collector according to any one of claims 1 to 3, wherein the pair of electrodes are provided on the guard plate, and a notch or a slit is provided on the guard plate between the electrodes.

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