JP2001321596A - Filter equipment and drain pump equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter equipment with highly effective in foreign matter catching and a drain pump equipment. SOLUTION: This filter equipment is equipped with a filter case 34 which comprises a cylindrical body with an inlet 38 for fluid to flow into on the periphery surface and an outlet 39 formed in the rear of the cylindrical body for the fluid to flow out to the end face 34 and a filter body 36 which is mounted inside the filter case 34, has a cylindrical inner passage with a rearward open end face 54 built in the filter case 34, and is equipped with a filter part 51 to filter foreign matter on the periphery face. The filter body 36 is closely attached to the periphery face of the outlet 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for catching foreign matter such as lint contained in waste water from a washing machine and a drain pump device having the filter device.

[0002]

2. Description of the Related Art In a conventional washing machine, washing water is supplied to a water tub, and after a washing step and a rinsing step are performed, the washing water is drained. The drainage contains impurities such as lint from clothes, and is filtered by a filter device having a mesh filter or the like. Further, when draining water to a position higher than the water level supplied to the water tank, washing water is pumped up by a drainage pump.

FIG. 11 shows a sectional view of a conventional filter device 17. A cap 35 is fastened to the cylindrical filter case 34 by a screw portion 37, and the front surface is closed. The filter body 36 is integrated with the cap 35 by the engagement of the engagement portions 35a, 36a, and is detachable from the filter case 34 so as to be able to dispose of impurities.

[0004] The filter body 36 is as shown in FIG. The box-shaped filter portion 51 integrated with the front portion 43 facing the cap 35 is made of a resin molded product.
It is formed in a net shape so as to have the opening 51a. A packing 42 is fixed to the front surface 43, and when the cap 35 is fastened to the filter case 34, it comes into contact with the wall surface of the step portion 34d of the filter case 34 to hermetically seal to prevent water leakage. .

[0005] An inlet 38 is provided on the peripheral surface of the filter case 34, and an outlet 39 is provided on the rear end surface. Accordingly, the washing water flowing into the filter device 17 from the inflow port 38 by the driving of the drainage pump (not shown) is filtered by the filter unit 51 for impurities such as lint. Then, the washing water that has flowed out of the outlet 39 and from which contaminants have been removed via a drain pump is drained from the rear of the washing machine.

[0006]

However, according to the above-mentioned conventional filter device 17, when the washing water flows out of the outlet 39 without passing through the filter portion 51 as shown by the arrow A, it is not possible to sufficiently capture foreign substances. was there. As a result, there is a problem that a failure of the drainage pump is caused.

[0007] In addition, it is necessary to remove the cap 35 from the inner wall of the filter case 34 and remove it by cleaning, which is inconvenient. In addition, the filter device 17 is disposed at the front of the washing machine to dispose of the removed contaminants, and the drain pump is connected to the filter device 17 by a long drain duct to drain from the rear of the washing machine. Is arranged behind.
Therefore, there is a problem that it is difficult to clean the drain pump.

[0008] An object of the present invention is to provide a filter device having a high contaminant capturing effect. Another object of the present invention is to provide a filter device that can easily remove the deposits attached to the inner wall. Also,
An object of the present invention is to provide a pump device that can easily clean a drain pump.

[0009]

In order to achieve the above object, a filter device according to the present invention comprises a tubular body having an inlet through which a fluid flows, and the fluid is provided on an end face behind the tubular body. A filter case with an outflow outlet formed,
A filter body formed in the filter case and having a cylindrical internal passage with a rear end face opened, and a filter portion formed on a peripheral surface of the filter portion for filtering impurities, around the outlet. It is characterized in that the filter body is closely attached.

According to this structure, the sewage containing impurities flows into the filter device from the inflow port, is filtered by the filter portion, passes through the inside of the cylindrical filter body, and flows out from the outflow port. Since the filter body is in contact with the periphery of the outlet, sewage passing outside the cylindrical filter body is prevented from flowing out of the outlet.

The present invention also provides the filter device having the above-described configuration, wherein the diameter of the filter case is increased so as to have a stepped portion in the axial direction, and an enlarged portion having an open end face is provided at a front portion of the filter case. A detachable cap for closing the enlarged-diameter portion, and an annular packing made of an elastic body disposed on a wall surface of the step portion, wherein the cap is attached to sandwich the packing between the filter body. It is characterized in that the filter body is pressed against the periphery of the outlet at the same time as the protrusion projecting radially from the peripheral surface is pressed against the wall surface of the step portion.

According to this structure, the filter body is pressed by mounting the cap, and the gap between the step portion of the filter case and the filter body is sealed by the packing, thereby preventing water leakage. Further, the filter body can be brought into close contact with the rear end face of the filter case by the elastic force of the packing.

Further, the present invention is characterized in that in the filter device having the above structure, an annular projection is provided on a wall surface of the step portion. According to this configuration, the packing pressed by the mounting of the cap is locally pressed against the projection of the step portion.

Further, the present invention is characterized in that, in the filter device having the above structure, the diameter of the lower portion of the open end of the enlarged diameter portion is further increased. According to this configuration, the sewage collected in the filter case is guided to the further enlarged portion below the enlarged portion when the cap is detached, and is drained.

Further, the present invention is characterized in that in the filter device having the above structure, an elastic portion having elasticity is provided on a rear end face of the filter body. According to this configuration, by pressing the filter body backward, the elastic portion is securely brought into close contact with the rear end face of the filter case.

Further, the present invention is characterized in that, in the filter device having the above-mentioned structure, the cap is screwed and mounted on the enlarged-diameter portion, and a stopper for regulating a rotation amount of the cap is provided. According to this configuration,
When the cap is screwed into the filter case, it comes into contact with the stopper and stops at a certain position and is attached.

Further, according to the present invention, in the filter device having the above structure, a flange protruding in a radial direction from a peripheral surface of the filter body and having a diameter substantially equal to an inner diameter of the filter case is provided on the filter body. It is characterized by. According to this configuration, when the filter body is moved from the filter case in the axial direction and taken out, the collar portion slides on the inner peripheral wall surface of the filter case to remove the attached matter.

Further, the present invention is characterized in that, in the filter device having the above-mentioned configuration, the filter portion is formed by connecting a plurality of filter units formed in a lattice shape in the axial direction.

Further, the present invention is characterized in that in the filter device having the above structure, the inner diameter of the filter case is larger than the inner diameter of the inflow port.

Further, the pump device of the present invention includes the filter device having the above-described structure, and a pump having a pump chamber for sucking a fluid from a suction port by driving a motor, wherein the outlet of the filter device is connected to the pump chamber. The filter device and the pump are integrally formed so as to serve as the suction port.

According to this structure, when the impeller or the like is rotated by the driving of the pump, the fluid flows in from the inflow port of the filter device, passes through the inside of the filter body, and is sucked from the outflow port into the adjacent pump chamber. Then, the fluid is discharged through the pump chamber.

The present invention also provides the pump device having the above-mentioned structure, wherein a cylindrical portion whose peripheral surface is closed and whose inner peripheral wall is tapered rearward is provided behind the filter body. Features. According to this configuration, the fluid is rectified by the tubular portion, and the fluid efficiently flows out toward the pump chamber.

Further, the present invention is characterized in that, in the pump device having the above structure, a vent hole is provided in an upper portion of the filter case. According to this configuration, when air enters the filter case, the air is exhausted from the vent hole,
Pump air biting is prevented.

Further, the present invention is characterized in that, in the pump device having the above-mentioned structure, a backflow preventing means for preventing a backflow of the fluid is provided at a discharge portion provided upright in the pump chamber.
According to this configuration, when pulsation occurs in the fluid discharged from the pump, the backflow prevention unit prevents the backflow of the fluid, and drains efficiently.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same parts as those in FIGS. 11 and 12 of the conventional example are denoted by the same reference numerals.
FIG. 1 is a sectional view showing a drum type washing machine having the filter device of the first embodiment.

In the drum type washing machine, the outer box 1 is disposed on the bottom 41, and the upper surface of the outer box 1 is covered with the top plate 40. The outer box 1 is formed by sheet metal processing a decorative steel plate. Top plate 40
Is made of a compression board or the like and is screwed to the outer case 1. The outer box 1 has a front surface that can be opened and closed by an opening / closing door 3. An operation panel 11 having operation keys is provided on an upper front part of the outer box 1.

In the outer box 1, a bottomed cylindrical water tank 4 having an opening 4a on the front side is provided horizontally, and in the water tank 4, a bottomed cylindrical drum 5 is arranged. The drive mechanism 9 is integrated with the water tank 4. A shaft portion 5e fixed to the drum 5 is rotatably supported by a bearing 6, so that the driving mechanism 9 can rotate the drum 5.

A small hole 5a is provided in the peripheral wall of the drum 5. The small holes 5a allow the washing water to flow between the water tub 4 and the drum 5 during washing. A baffle 5b is provided to protrude from the inner wall surface of the drum 5, and the laundry is caught by the rotation of the drum 5, lifted up, and dropped into the washing water to perform washing.

A packing 10 made of an elastic material such as rubber or soft resin forms a passage for taking in and out the laundry at the periphery of the laundry loading opening 1a provided on the front surface of the outer box 1 and the opening 4a of the water tub 4. Attached to. The opening / closing door 3 has a window 3 made of a transparent member so that the inside of the drum 5 can be visually recognized.
a is protrudingly provided.

The packing 10 has a structure in which the inner peripheral edge 10a is in close contact with the peripheral edge of the window 3a to close the passage when the door 3 is closed. Thereby, waterproofing is performed during the washing operation. In addition, a bellows or the like is provided on the packing 10,
In accordance with the swing of the water tank 4, the water tank 4 is bent and follows.

A water supply pipe 12 communicating with a water pipe is provided in an upper portion of the outer box 1. When the water supply valve 13 provided in the middle of the water supply pipe 12 is opened, water is supplied into the water tank 4 from the water supply nozzle 15 attached to the door packing 10 via the detergent case 14.

The drain duct 1 led out from the lower part of the water tank 4
A filter device 17 for filtering washing water is connected to 6a, and is connected to a drain pump 18 via a drain duct 16b. The drain pump 18 is connected to a drain pipe 33 erected outside the outer box 1. By driving the motor 18c, the impeller 18b disposed in the pump chamber 18a is rotated to pump up the washing water flowing from the water tub 4 and drain the water to the outside.

Since the drain pump 18 cannot stop the water, the drain pipe 33 stands up to the level of the washing water supplied to the water tub 4. This prevents water leakage,
It can drain to the outside.

An air trap 22 is provided in the drain duct 16a.
, A water level sensor 23 is provided via a pressure guiding pipe 21. The water level sensor 23 moves the magnetic body in the coil according to the pressure change in the air trap 22. The resulting change in inductance of the coil is detected as a change in oscillation frequency, and the water level in the water tank 4 is detected.

The filter device 17 is configured as shown in the perspective view and the sectional view of FIGS. FIG. 4 is a sectional view of the filter case 34. An enlarged diameter portion 47 having a stepped portion 34d and having an enlarged diameter is provided at a front portion of the cylindrical filter case 34. Screw part 3 in the enlarged diameter part 47
7 is formed, and the cap 35 is fastened by the screw portion 37 to close the front surface of the filter case 34.

The filter body 36 is integrated with the cap 35 by the engagement of the engagement portions 35a, 36a with the compression spring 45 interposed therebetween. The cap 35 is detached by rotating the cap 35 with the handle 35b, and the filter body 36 can be taken out of the filter case 34.

The filter body 36 is configured as shown in FIG. A front surface portion 43 for closing the front surface is integrated with the cylindrical filter portion 51. The filter portion 51 is made of a resin molded product, and is formed in a net shape so as to have an opening 51a. 52 is a rib for securing the strength of the filter section 51. Further, the filter portion 51 may be formed by attaching fine fibers to the peripheral surface of the rib 52.

Behind the filter 51, an opening 51 is provided.
a is formed, and a cylindrical portion 53 whose peripheral surface is closed is formed, and an opening 54a (see FIG. 3) is formed in an end surface of the cylindrical portion 53.
And a flange portion 54 that protrudes in the radial direction is formed.
A packing 42 made of an elastic material such as rubber is fixed to the front surface 43.

In FIG. 3, an inlet 38 through which washing water flows is provided on the peripheral surface of the filter case 34, and an outlet 39 through which washing water flows is provided at the rear. The inside diameter of the inflow port 38 is smaller than the inside diameter of the filter case 34. Thus, impurities that can pass through the inflow port 38 can flow into the filter case 34 without closing the entrance to the filter case 34. The flange 54 of the filter body 34 is connected to the outlet 39.
The opening 54a and the outlet 39 are substantially concentric.

When the cap 35 is fastened to the filter case 34, the packing 42 is pressed against the inner wall surface of the step 34d via the compression spring 45 and the front surface 43 of the filter body 36. Thereby, the filter case 34 is sealed, and water leakage from the filter case 34 is prevented.

An annular projection 47b is formed on the inner wall surface of the step 34d so as to project in the axial direction. This allows
Since the packing 42 is locally pressed, the water leakage prevention performance can be further improved.

At the same time, the compression spring 45 and the packing 4
The flange portion 54 of the filter body 36 is pressed around the outlet 39 by the elastic force of 2. Thereby, the collar 54
And the rear end face 34a of the filter case 34 are in close contact with each other so that contaminants cannot flow out between them.

When the drain pump 18 is driven, the inlet 3
The washing water flowing from 8 into the filter device 17 is filtered by the filter unit 51 to remove impurities such as lint. Then, the washing water flows out from the outlet 39 and is discharged from the drain pump 1.
8 (see FIG. 1). afterwards,
The washing water from which contaminants have been removed is drained from the rear of the washing machine via a drain pipe 33.

At this time, since the peripheral surface of the cylindrical portion 53 is closed, the washing water flowing out of the filter body 36 is rectified into a cylindrical shape, and the drainage efficiency of the drainage pump 18 is improved. . In addition, since the air remaining in the filter case 34 is exhausted from the ventilation holes 44, it is possible to prevent the drain pump 18 from being caught by air. The ventilation port 44 is provided on the upper part of the filter case 34, and is fixed in communication with the atmosphere by a hollow tube (not shown) made of a vinyl tube or the like.

According to the present embodiment, the outlet 39 of the washing water
The flange 54 of the filter body 36 is closely in contact with the surroundings, so that the washing water containing impurities does not flow out of the outlet 39, and only the washing water filtered by the filter 51 flows out of the outlet 39. I do. Therefore, the failure of the drain pump 18 can be prevented.

The flange 54 is formed to have substantially the same diameter as the inner diameter of the filter case 34. For this reason, the cap 35
Is removed and the filter body 36 is pulled out in the axial direction, so that the flange portion 54 slides on the inner peripheral wall 34b of the filter case 34, and it is possible to remove the deposit attached to the inner peripheral wall 34b. This makes it possible to easily clean the inside of the filter case 34, and to easily prevent the filter device 17 from being blocked by a substance adhering to the inner peripheral wall 34b.

At this time, the inner peripheral wall 3 of the filter case 34
Adhered matter removed from the filter case 4b and contaminants removed by the filter part 36 are filtered by the flange part 54 into the filter case 3.
4 together with the remaining washing water. Enlarged part 4
A guide portion 47c having a further enlarged diameter is formed at the lower portion of 7, and the scraped-out washing water and the like are guided to a narrow range by the guide portion 47c and stored in a tray T which is installed in advance. Thereby, when the cap 35 is opened, it is possible to prevent the washing water or the like from scattering and soiling the floor surface or the like.
Reference numerals 34e and 34f denote a plurality of ribs protruding in the filter case 34 in the axial direction.
Are held coaxially with the filter case 34.

In FIG. 2, a stopper 34c, which projects forward in the axial direction, is provided on the end face of the front surface of the filter case 34.
34d are formed. The cap 35 is formed with a protrusion 35c protruding rearward in the axial direction. The stopper 34d is formed slightly lower than the stopper 34c, and when the cap 35 is tightened, the projection 35c rides over the stopper 34d and comes into contact with the stopper 34c so that the cap 35 is locked.

Thus, the cap 35 can be moved to a certain position.
Can be tightened, the packing 42 can be prevented from being damaged due to excessive tightening, and water leakage due to insufficient tightening can be prevented. In addition, the loosening of the cap 35 due to the vibration of the washing machine or the like is stopped by the projection 35c abutting on the stopper 34d, and water leakage can be prevented.

FIG. 6 is a sectional view showing a filter device 17 according to the second embodiment. For convenience of description, the same portions as those in the first embodiment shown in FIG. 3 are denoted by the same reference numerals. The structure of the filter body 36 is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment.

The filter body 36 of the present embodiment has a
The periphery of 4 is formed to have elasticity in the axial direction. As a result, the flange portion 54 abuts on the end portion 34a of the filter case 34 with elasticity, so that the filter case 34 can be tightened by the cap 35 without using the compression spring 45 (see FIG. 3) as in the first embodiment. The flange 54 can be closely attached to the periphery of the outflow port 39 without gaps, and the outflow of impurities can be prevented.

Next, FIG. 7 is a sectional view showing a filter device 17 according to a third embodiment, and FIG. 8 is a perspective view showing a filter body 36. The same parts as those in the first and second embodiments shown in FIGS. 3 and 6 are denoted by the same reference numerals. The structure of the filter body 36 is different from those of the first and second embodiments, and the other configuration is the same.

The filter portion 51 of the filter body 36 made of a resin molded product has a plurality of radially arranged ribs 56.
And a plurality of filter units 60 each comprising a plurality of annular ribs 57 and 58 connecting the respective ribs 56. Thereby, the length of the filter body 36 can be changed according to the model of the filter device 17. Even with such a configuration, the same effects as those of the first and second embodiments can be obtained.

Next, FIG. 9 is a sectional view showing a drum type washing machine having a pump device according to a fourth embodiment. First to third
The same parts as those of the embodiment are denoted by the same reference numerals. The difference from the first to third embodiments is that a pump device 19 in which a drainage pump 18 is integrated with a filter device 17 is provided. Other points are the same as the first to third embodiments.

The drainage duct 1 led out from the bottom of the water tank 4
A pump device 19 including a filter device 17 for filtering washing water and a drainage pump 18 is connected to 6a. The drain pump 18 is connected to a drain pipe 33 erected outside the outer box 1, and the impeller 18b arranged in the pump chamber 18a rotates by the drive of the motor 18c to pump up the washing water and drain to the outside. It is supposed to do.

As shown in FIG. 10, the pump device 19 has the same filter device 17 as the third embodiment shown in FIG. The outer wall of the pump chamber 18a is the filter device 1
7 and is integrally formed with the filter case 34. A motor 18c is attached to the pump chamber 18a by screws 18d.

By the rotation of the impeller 18b, the washing water is sucked from the drain port 39 of the filter device 17 into the pump chamber 18a. Therefore, the drain port 39 is a suction port of the drain pump 18. The discharge port 18e of the pump chamber 18a
And discharged through a drain pipe 33 connected to the discharge port 18e.

The discharge port 18e is provided with a valve 61. The valve 61 is opened by the water pressure when the washing water is discharged from the discharge port 18e, and is closed when the washing water is not discharged. Accordingly, when the washing water discharged by the drain pump 18 pulsates and the water pressure decreases, the backflow from the discharge port 18e can be prevented, and the drainage efficiency can be improved.

According to this embodiment, since the filter device 17 and the drainage pump 18 are integrally formed in the pump device 19, the drainage pump 18 can be disposed in front of the drum type washing machine. Therefore, by increasing the opening area of the outlet 39, the pump chamber 18a can be easily cleaned from the front when the cap 35 and the filter unit 51 are detached.

Further, by forming the inner wall of the cylindrical portion 53 of the filter body 36 into a tapered shape so as to increase in diameter toward the outlet 39, the outlet 3 having a large opening area can be efficiently formed.
The washing water can be led to 9. Thereby, the drainage efficiency of the drainage pump 18 can be improved.

Further, the ventilation port 44 is provided just before entering the pump chamber 18a, and is communicated with the atmosphere by the hollow pipe 82, so that the air in the filter case 34 can be released into the atmosphere, and the air enters the pump chamber 18a. It is possible to prevent a decrease in pump performance due to air mixing due to air mixing.

[0062]

According to the present invention, since the filter body is in close contact with the outlet of the washing water, the washing water containing impurities does not flow out of the outlet, and the washing is filtered by the filter portion. Only water can flow out of the outlet. Accordingly, it is possible to prevent a failure of the drain pump connected to the filter device.

Further, according to the present invention, since the filter body is pressed against the inner wall surface of the stepped portion forming the enlarged diameter portion with the packing interposed therebetween by attaching the cap, water leakage from the front portion of the filter device can be prevented. At the same time, since the filter body is pressed around the outlet, the elasticity of the packing makes it possible to ensure that the filter body is in close contact with the periphery of the outlet, so that impurities can be prevented from easily flowing out.

Further, according to the present invention, since the annular projection is provided on the inner wall surface of the enlarged diameter portion, the packing is locally press-contacted, and the water leakage prevention performance can be further improved.

Further, according to the present invention, since the diameter of the lower portion of the open end of the enlarged diameter portion is further increased, impurities and washing water scraped out when the cap is opened are guided to a narrow area and discharged. Thus, it is possible to prevent the washing water or the like from being scattered when the cap is opened and soiling the floor surface or the like.

Further, according to the present invention, since the elastic portion having elasticity is provided on the rear end face of the filter body, the flange can be brought into close contact with the periphery of the outlet of the filter case without any gap, and the outflow of impurities can be achieved. Can be easily prevented.

Further, according to the present invention, the cap is screwed into the enlarged diameter portion and mounted, and the stopper for restricting the rotation amount of the cap is provided. The packing can be prevented from being damaged, and water leakage due to insufficient tightening can be prevented.

Further, according to the present invention, since a flange portion having substantially the same diameter as the inner diameter of the filter case is provided on the filter body,
When the filter body is pulled out in the axial direction, the flange slides on the inner peripheral wall of the filter case, and it is possible to remove the deposit attached to the inner peripheral wall. This makes it possible to easily clean the inside of the filter case, and it is possible to easily prevent the filter device from being clogged by a substance attached to the inner peripheral wall.

Further, according to the present invention, since the filter portion is formed by connecting a plurality of filter units formed in a lattice shape in the axial direction, the length of the filter body can be changed according to the type of the filter device. it can.

Further, according to the present invention, since the inner diameter of the filter case is made larger than the inner diameter of the inflow port, it is possible to prevent the inside of the filter case from being blocked by impurities passing through the inflow port.

Further, according to the present invention, since the filter device and the pump are integrally formed such that the outlet of the filter device serves as the suction port of the pump chamber, the drainage pump can be disposed forward. Therefore, by increasing the opening area of the outlet, the pump chamber can be easily cleaned from the front when the cap and the filter unit are detached.

Further, according to the present invention, since the inner peripheral surface of the filter body is tapered toward the outlet, the washing water can be efficiently guided to the outlet by increasing the opening area of the outlet. . Thereby, the drainage efficiency of the drainage pump can be improved.

Further, according to the present invention, since the ventilation hole is provided in the upper part of the filter case, the air remaining in the filter case can be exhausted, and the drain pump can be prevented from being caught by the air.

Further, according to the present invention, since the discharge portion provided upright in the pump chamber is provided with the backflow preventing means for preventing the backflow of the fluid, the washing water discharged by the drain pump pulsates and the water pressure drops. In this case, backflow from the discharge port can be prevented, and drainage efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a washing machine including a filter device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a filter device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating the filter device according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a filter case of the filter device according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a filter body and a cap of the filter device according to the first embodiment of the present invention.

FIG. 6 is a sectional view showing a filter case of a filter device according to a second embodiment of the present invention.

FIG. 7 is a sectional view showing a filter case of a filter device according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a filter body of a filter device according to a third embodiment of the present invention.

FIG. 9 is a sectional view showing a washing machine including a pump device according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing a pump device according to a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a conventional filter device.

FIG. 12 is a perspective view showing a filter body of a conventional filter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer box 3 Opening / closing door 4 Water tank 5 Drum 9 Driving device 16a, 16b Drain duct 17 Filter device 18 Drain pump 18a Pump room 18b Impeller 18c Motor 19 Pump device 33 Drain pipe 34 Filter case 35 Cap 36 Filter body 38 Inlet 39 Outflow port 42 Packing 44 Vent hole 45 Compression spring 47 Large diameter part 47a Inner wall 47b Projection part 51 Filter part 53 Cylindrical part 54 Flange part 60 Filter unit 61 Valve

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) D06F 39/08 321 B01D 29/10 510E F04B 53/20 510G 530A 35/02 P F04B 21/06 BF Term (Reference) 3B155 AA18 CA02 CB43 CB56 FC06 FE02 FE14 MA01 MA02 3H071 AA01 CC35 CC41 DD32 DD62 4D064 AA13 BG14 BG18

Claims (13)

[Claims] 1. A filter case comprising a cylindrical body having an inflow port into which a fluid flows, and an outflow port through which the fluid flows out at a rear end face of the cylindrical body; And a filter body having a cylindrical internal passage with an open rear end face, and a filter portion formed on a peripheral surface for filtering a foreign substance, and the filter body is closely contacted around the outlet. A filter device, characterized in that: 2. An enlarged diameter portion having a stepped portion on an inner peripheral surface of the filter case and an enlarged diameter portion having an open end face is provided at a front portion of the filter case, and is detachable to close the enlarged diameter portion. A cap, and an annular packing made of an elastic body disposed to face a wall surface of the stepped portion, wherein the cap is fitted to project radially from a peripheral surface of the filter body with the packing interposed therebetween. The filter device according to claim 1, wherein the filter body is pressed around the outlet at the same time as the part is pressed against the wall surface of the step part. 3. The filter device according to claim 2, wherein an annular projection is provided on a wall surface of the step portion. 4. The filter device according to claim 2, wherein a diameter of a lower portion of an open end of the enlarged diameter portion is further enlarged. 5. The filter device according to claim 2, wherein an elastic portion having elasticity is provided on a rear end surface of the filter body. 6. The cap according to claim 2, wherein the cap is screwed onto the enlarged diameter portion and mounted, and a stopper for regulating a rotation amount of the cap is provided. Filter device. 7. The filter body according to claim 1, further comprising a flange protruding in a radial direction from a peripheral surface of the filter body, and a flange having a diameter substantially equal to an inner diameter of the filter case. 7. The filter device according to any one of 6. 8. The filter device according to claim 1, wherein the filter unit is formed by connecting a plurality of filter units formed in a lattice shape in an axial direction. 9. The filter case according to claim 1, wherein an inner diameter of the filter case is larger than an inner diameter of the inflow port.
A filter device according to claim 8. 10. A filter device according to claim 1, further comprising a pump having a pump chamber for sucking a fluid from a suction port by driving a motor, wherein the outlet of the filter device is provided. The pump device, wherein the filter device and the pump are integrally formed so as to be the suction port of the pump chamber. 11. The pump according to claim 10, wherein a cylindrical portion whose peripheral surface is closed and whose inner peripheral wall is tapered toward the rear is provided behind the filter body. apparatus. 12. The air filter according to claim 10, wherein a ventilation hole is provided in an upper portion of the filter case.
A pump device according to claim 1. 13. The pump device according to claim 10, wherein a backflow preventing means for preventing a backflow of the fluid is provided at a discharge portion provided upright in the pump chamber.