JP2000041931A - Pump for dish washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pump for a dish washer which achieves an accurate operation of a selector valve along with excellent sealability. SOLUTION: This pump is provided with a suction port 25, a washing water discharge port 26 and a filthy water discharge port 28 and has a selector valve 50 to discharge washing water or filthy water from either the washing water discharge port 26 or the filthy water discharge port 28 according to normal or opposite rotation of an impeller 10. The selector valve 50 is constituted of a valve body 51 with a spherical part 52 and a valve plate 56 with a rotating shaft integrally formed with the valve body 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes and the like, in which washing water is fed under pressure to a nozzle.
The present invention relates to a dishwasher pump for discharging dirty washing water to the outside.

[0002]

2. Description of the Related Art A dishwasher pump is provided with a discharge port for washing water and a washing water contaminated by washing (hereinafter, referred to as a single pump).
A discharge port for wastewater) and open the discharge port or discharge port according to the forward or reverse rotation of the motor. When the discharge port is opened, the cleaning water is pumped to the cleaning nozzle and the discharge port is opened. Is configured to discharge sewage to the outside from a drain port, and is provided with a switching valve device for this purpose.

FIGS. 13 to 15 show Japanese Patent Application Laid-Open No. H10-43121.
1 shows a dishwasher and a pump thereof described in Japanese Patent Application Publication (Prior Art 1). In FIG. 13, reference numeral 61 denotes a main body of a dishwasher, 62 denotes a water tank provided at a lower portion of the main body 61, 63 denotes a washing nozzle group, and 64 denotes a dish basket. 65
Is a pump, 66 is a suction port for washing water connected to the water tank 62, 67 is a discharge port for washing water connected to the washing nozzle group 63, 68 is a discharge port for sewage connected to a drain port 69, 70
Is a motor for driving the pump 55.

14 and 15, which show the structure of the pump 65, 71 is a substantially cylindrical casing body, 72 is a lid, 67 is a discharge port of washing water provided in the casing body 71, and 68 is adjacent to the discharge port 67. Sewage drains,
Reference numeral 66 denotes a suction port for cleaning water provided on the lid 72. Reference numeral 73 denotes an impeller housed in the casing body 71,
0 output shaft. Reference numeral 74 denotes the casing body 7 extending from the opening of the discharge port 67 to the opening of the discharge port 68.
A guide groove 75 provided on the inner wall of the valve member 1 is a valve plate slidably disposed along the guide groove 74, and has a forward flow receiving surface 77 and a reverse flow receiving surface 78 at one end. A pressure receiving rib 76 is provided.

In the above-described pump, when the impeller 73 is driven by the motor 70 and rotates in the normal rotation direction (the direction of arrow A in the figure), the valve plate 75 is rotated forward by the washing water sucked from the suction port 66. The water receiving pressure surface 77 receives the water pressure and moves in the direction of arrow A along the guide groove 74 to discharge the washing water 67.
Is opened, and the drain 68 of the wastewater is closed. This allows
The cleaning water is sent from the discharge port 67 to the cleaning nozzle group 63 under pressure. On the other hand, when the impeller 73 rotates in the reverse direction, the valve plate 75 receives water pressure on the reverse flow pressure receiving surface 78, moves in the direction opposite to the arrow along the guide groove 74, opens the discharge port 68, and closes the discharge port 67. I do. Thereby, the sewage is pumped from the discharge port 68 to the drain port 69 and discharged to the outside.

[0006] Further, the washing / drain switching valve of a dishwasher described in Japanese Patent Application Laid-Open No. 9-294703 (prior art 2) is formed of a flat plate having a rotating shaft, and turns in accordance with the rotating direction of the impeller. The opening and closing of the cleaning discharge port or the drain discharge port is performed.

[0007]

In the switching valve device of the prior art 1, since the valve plate 75 moves along the inner wall surface of the casing body 71 and the guide groove 74, the operability is poor due to its frictional resistance. When foreign matter such as residue enters between the valve plate 75 and the casing body 71, malfunction is likely to occur, and washing water flows out of the waste water discharge port 68 during washing,
Shortage of washing water may occur.

Further, the cleaning and drainage switching valve of the prior art 2 is
Since the flat plate is in contact with the opening of the washing water discharge port or the drain discharge port and is closed, there is a problem in the sealing property, and in particular, foreign matter such as residue enters between the flat plate and the pump casing. It is easy, unstable, and may cause the same problem as in the prior art 1.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a pump for a dishwasher in which the operation of a switching valve is reliable and which has excellent sealing properties. .

[0010]

(1) A dish dryer pump according to the present invention includes a suction port, a washing water discharge port, and a sewage discharge port, and the washing water is supplied in accordance with forward or reverse rotation of an impeller. A switching valve for discharging the washing water or the sewage from one of the discharge port and the sewage discharge port, and the switching valve is integrally formed with the valve body having a spherical portion and the valve body having a rotating shaft; And a valve plate formed in the same. (2) The valve body of the switching valve of (1) is formed of an elastic material.

(3) The valve body of the switching valve of the above (1) or (2) is formed in a substantially U-shape, air is sealed inside, and the opening is sealed with a lid. (4) The switching valve of (1) or (2) was formed by blow molding. (5) The switching valve of the above (1) or (2) is formed solid from a material having a specific gravity smaller than 1.

(6) A primary dynamic pressure receiving pressure for cutting off a part of the valve body to receive the water pressure when the impeller rotates forward, on the side of the flush water channel of any of the above-mentioned switching valves (1) to (5). Surface was formed. (7) The valve plate of any one of the above (1) to (5) is formed in a frame shape that substantially surrounds the center of the outer periphery of the valve body, and the impeller is rotated forward by the frame-shaped valve plate. A primary dynamic pressure receiving surface and a secondary dynamic pressure receiving surface for receiving the water pressure at the time of rotation or reverse rotation are formed. (8) The switching valve of any of the above (1) to (7) was constantly urged toward the sewage discharge port by a spring.

(9) The cleaning water discharge port and the sewage discharge port of the dishwasher pump of (1) are formed in circular shapes,
The valve body of the switching valve is configured to make linear contact with the opening. (10) A plate-shaped or ring-shaped elastic seat having a circular opening was attached to the opening of the sewage discharge port of (9). (11) The inner diameter of the opening of the elastic seat of (10) is 70 to 90% of the inner diameter of the opening of the sewage discharge port. (12) A lip is provided on the periphery of the opening of the elastic seat of (10) or (11) on the sewage flow channel side.

(13) A substantially triangular rectifying table is provided between the impeller and the switching valve of the above (1), and an impeller side wall surface corresponding to a rotation locus of the impeller is provided on the impeller side of the rectifying table. The cleaning water side wall surface was formed on the side of the cleaning water flow channel, and the switching valve side wall surface corresponding to the rotation locus of the switching valve was formed on the switching valve side.

(14) A substantially triangular rectifying stand is provided between the impeller of (1) or (13) and the switching valve, and the rectifying stand corresponds to the rotation locus of the impeller from the top of the sewage flow channel side. And a rectifying plate is extended to form a sewage flow water inlet between the tip of the rectifying plate and the inner surface of the peripheral wall. A washing water inlet was formed in between, and the sewage inlet was formed smaller than the washing water inlet.

(15) The primary dynamic pressure when the switching valve closes the opening of the washing water discharge port at the intersection of the washing water side wall surface and the switching valve side wall surface of the rectifying table of (13) or (14). In addition to being located on the side of the washing water flow passage from the pressure receiving surface, the top of the switching valve side wall surface was located on the side of the dirty water flow passage from the primary dynamic pressure receiving surface when the switching valve closed the waste water discharge port.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a front view of a dishwasher pump according to a first embodiment of the present invention, partly in section, FIG. 2 is a plan view of FIG. 3 is a right side view of the casing of FIG. 2, FIG. 4 is an exploded perspective view of FIG. 1, and FIG. 5 is a sectional view taken along line AA of FIG.
It comprises a pump body 1 and a motor 15. Hereinafter, the present embodiment will be described in detail with reference to the drawings.

In the pump body 1, reference numeral 2 denotes a base, which comprises a substantially circular impeller mounting portion 3 and a substantially trapezoidal water passage portion 4 continuous therewith. Is provided with a cylindrical portion 5 protruding downward. A partition 6 having a through hole 7 in the center is provided slightly above the center of the cylindrical portion 5, and a recess 8 into which a boss of an impeller described later is inserted is formed in the upper portion of the partition 6. The concave portion 8 is provided with a mechanical seal 8a. Reference numeral 9 denotes a round hole provided at one corner of the water channel portion 4 and into which a rotating shaft of a switching valve described later is rotatably inserted. 2a is a plurality of screw holes provided on the outer periphery of the base 2, and 2b is a screw hole.

Reference numeral 10 denotes an impeller having a plurality of blades 12 provided on a disk 11, and a boss 13 is provided at the center of the lower surface of the disk 11, and the boss 13 is a concave portion provided on the base 2. 8
Is loosely fitted into a central hole of a mechanical seal 8a disposed in the partition wall 6 and protrudes downward from a through hole 7 provided in the partition wall 6. Fifteen
The output shaft 16 of the motor rotates in the forward and reverse directions.
Of the boss 13. Reference numeral 17 denotes a bearing cover, and reference numeral 18 denotes a screw hole provided corresponding to the screw insertion hole 2a provided in the base 2.

Reference numeral 20 denotes a casing formed in substantially the same planar shape as the base 2 and integrally connected to the base 2 by screws, comprising a top plate 21 and a peripheral wall 22, and an impeller mounting portion 3 of the base 2. Above is formed an impeller accommodating portion 23, and a switching valve accommodating portion 24 is provided continuously therewith. Reference numeral 25 denotes a suction port for washing water, which is provided just above the concave portion 8 of the base 2 from the top plate 21.

Reference numeral 26 denotes a washing water discharge port which protrudes outward from the peripheral wall 22 of the switching valve housing 24 and communicates with the switching valve housing 24 through a circular opening 27 provided in the peripheral wall 22.
Reference numeral 28 denotes a sewage discharge port protruding outward from the peripheral wall 22 in the vicinity of the wash water discharge port 26 and communicates with the switching valve accommodating section 24 through a circular opening 29 provided in the peripheral wall 22. 29a
Is a U-shaped groove provided below and on both sides of the opening 29.

Numeral 30 denotes a square elastic seating body mounted on the switching valve storage section 24 side of the opening 29 of the sewage discharge port 28, and has an opening 31 at the center. For example, a tulip-shaped lip 32 protruding toward the switching valve housing portion 24 is provided. The diameter of the opening 31 is set at a value corresponding to the sewage discharge port 28 in order to reduce the return of drainage due to static pressure.
(For example, 70 to 90%). The shape of the elastic seat 30 is not limited to a square shape, but may be another shape such as a donut shape or a ring shape. In some cases, the elastic valve body 30 may be omitted.

Reference numeral 35 denotes the impeller housing 2 of the switching valve housing 24.
On the third side, a plane triangular rectifying table formed at substantially the same height as the peripheral wall 22, and on the impeller 10 side, an arc-shaped impeller side wall surface 36 corresponding to the rotation locus of the impeller 10 is formed. A cleaning water side wall surface 37 is formed on the cleaning water flowing channel 40 side along the peripheral wall 22 and at a predetermined interval. In addition, a switching valve side wall surface 38 is formed on the switching valve housing portion 24 side along a rotation locus of a switching valve described later. In this case, it is desirable that the gap between the switching valve and the switching portion side wall surface 38 be about 1 to 3 mm in order to prevent intrusion of residues and the like.

Reference numeral 39 denotes a round hole provided opposite to the round hole 9 of the base 2, and reference numeral 40 denotes a peripheral wall 22 and a cleaning water side wall surface 3 of the rectifying table 35.
7 is a flush water flow passage formed between the peripheral wall 22 and the switching valve side wall surface 38 of the rectification stand 35. Reference numeral 20a denotes a plurality of screw insertion holes provided on the outer periphery of the casing 20.

Numeral 50 denotes a switching valve having a substantially U-shaped cross section accommodated in the switching valve accommodating portion 24. As shown in FIG. 6, for example, a hollow spherical valve element 5 made of an elastic material having a Shore hardness of 60 to 80 is provided.
Flat surfaces 51a, 51b,
51c and 51d (51d is not shown) and the flat surface 5
A spherical part 52 on the side orthogonal to 1a to 51d;
And a square frame-shaped valve plate integrally formed with the valve body 51 so as to surround the substantially central portion of the outer periphery of the valve body 51 and to form an opening portion 54 which is cut and opened by leaving the spherical portion 53 around the other side. 56,
A rotation shaft 57 is provided on one side of the valve plate 56. Note that the valve plate 56 may be formed separately from the valve body 51 and attached to the valve body 51 with an adhesive or the like. And the rotating shaft 5
A primary dynamic pressure receiving surface 58 is formed by the valve plate 56 on the side opposite to the side 7, and a secondary dynamic pressure receiving surface 59 is formed by the upper and lower valve plates 56. In this case, a part of the valve element 51 may be cut off to form a primary dynamic pressure receiving surface, or the valve element 51 may be formed of an inelastic body. The opening 54 is closed by a lid 55 in a state where air is sealed therein, and is provided with buoyancy.

The switching valve 50 is disposed in the switching valve accommodating portion 24 with the spherical portion 52 positioned on the sewage flow channel 41 side,
The rotating shaft 57 is rotatably fitted into and supported by the round holes 9 and 39 provided in the base 2 and the casing 20. The round holes 9 and 39 have different depths in order to facilitate the mounting of the rotary shaft 57, and have an inner diameter that allows the rotary shaft 57 to rotate freely. In this case, the intersection 35a between the cleaning water side wall surface 37 and the switching valve side wall surface 38 of the above-described rectification table 35 is provided.
Is located closer to the washing water flow channel 40 than the primary dynamic pressure receiving surface 58 when the switching valve 50 closes the opening 27 of the washing water discharge port 26, and the top 35b of the switching valve side wall surface 38 is 50 is located closer to the sewage flow channel 41 than the primary dynamic pressure receiving surface 58 when the opening 29 of the sewage discharge port 28 is closed.

Next, an example of an assembling procedure of the dishwasher pump configured as described above will be described. First, the motor 15
The cylindrical portion 5 of the base 2 is fitted into the bearing cover 17 of the motor 15, and the screw inserted into the screw insertion hole 2a is inserted into the screw hole 18 of the motor 15.
And screw them together. Next, the mechanical seal 8 a is press-fitted into the concave portion 8 of the base 2. Then, the boss 13 of the impeller 10 is loosely fitted into the hole of the mechanical seal 8a,
The tip is connected to the output shaft 16 of the motor 15. Thereby, the impeller 10 is rotatably connected to the motor 15.

Next, the elastic seat body 30 with its lip 32 facing the switching valve accommodating section 24 side, and
9 into U grooves 29a provided below and on both sides. Thereby, the elastic seat body 30 is fixed to the opening 29 of the drain discharge port 28 by being pressed against the peripheral wall. In addition, instead of press-fitting into the U groove 29a, it may be fixed by a screw or the like. Next, the switching valve 50 is accommodated in the switching valve accommodating portion 24, and the lower portion of the rotary shaft 57 is loosely fitted in the round hole 9 provided in the base 2.

Next, the casing 20 is fitted on the upper surface of the base 2, and the screws inserted into the screw insertion holes 20 a are screwed into the screw holes 2 b of the base 2, and the two are integrally connected. At this time,
The upper part of the rotary shaft 57 of the switching valve 50 is fitted into the round hole 39 provided in the casing 20, and the switching valve 50 is
It is rotatably supported inside.

Next, the operation of this embodiment will be described mainly with reference to FIGS. When the motor 15 is energized and driven in the state shown in FIG. 5 to rotate the impeller 10 in the direction of arrow A (hereinafter referred to as forward rotation), the washing water sucked from the suction port 25 causes the rotational energy of the impeller 10 to increase. The washing water is sent from the washing water discharge port 26 by a jet, and is sent to an injection nozzle to inject washing water to wash dishes and the like.

At this time, the switching valve 50 receives the dynamic pressure of the washing water on the primary dynamic pressure receiving surface 58 and the secondary dynamic pressure receiving surface 59 in addition to the buoyancy from itself, and the sewage flow path around the rotary shaft 57. 41
And the spherical portion 52 is pressed against the elastic seat body 30 so as to be in close contact with the lip 32 and the opening portion 29 of the sewage discharge portion 28 is rotated.
Close. Thereby, the leakage of the cleaning water from the sewage discharge port 28 during the cleaning is reliably prevented, and the cleaning water can be pumped only from the cleaning water discharge port 26. The switching valve 5
Since 0 has buoyancy, there is almost no resistance when rotating.

Next, when the motor 15 is rotated in the opposite direction, the impeller 10 rotates in the direction of arrow B (hereinafter, referred to as reverse rotation) as shown in FIG. The rotation energy of the impeller 10 violently collides with the switching valve 50 through the sewage flow passage 41, receives the hydraulic pressure on the primary dynamic pressure receiving surface 58 and the secondary dynamic pressure receiving surface 59, and receives the switching valve 50.
Is rotated around the rotating shaft 57 toward the washing water flow channel 40. Thus, the spherical portion 53 around the opening 54 of the switching valve 50 is pressed against the outer periphery of the opening 27 of the washing water discharge port 26 to close the opening 27. At the same time, the opening 31 of the elastic seat 30 provided at the opening 29 of the wastewater discharge port 28 is opened, and the wastewater flows out of the wastewater discharge port 28 and is discharged to the outside.

As described above, in the present embodiment, the switching valve 50 has no sliding portion and utilizes the buoyancy to make the impeller 50
The cleaning water is rotated around the rotation shaft 57 by the water pressure, and the opening 27 of the cleaning water discharge port 26 or the sewage discharge port 28
The opening 31 or 31 of the elastic seat 30 is line-contacted and closed, so that the opening and closing of the openings 27 and 31 are not obstructed by residues or the like, and the opening 27 or 31 is securely closed. For this reason, it is possible to prevent the washing water such as tableware from leaking from the sewage discharge port 28.

[Second Embodiment] FIG. 8 is a plan sectional view of a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, a rectifying plate 35 d is extended from the top of the rectifying table 35 on the sewage flow channel 41 side in accordance with the rotation locus of the impeller 10, and the sewage flow An inlet 41a is formed. Reference numeral 40a denotes a cleaning water inlet formed between an intersection 35c of the impeller side wall surface 36 of the rectifying table 35 and the cleaning water side wall surface 37 and the inner surface of the peripheral wall 22.
The opening area 1a is formed to be about 10% of the opening area of the washing water inlet 40a.

In the first embodiment, the rectifying table 3
5 is large, the opening formed by the top of the wall surface on the side of the sewage flow channel 41 and the inner surface of the peripheral wall 22 is large. 1
There is a possibility that the washing water from 0 leaks from the opening to the sewage flow passage 41 side to push and move the switching valve 50 to flow from the sewage discharge port 28. In the present embodiment, since the sewage inlet 41a is formed narrow by providing the rectifier plate 35d on the rectifier base 35, the sewage inlet 41a when the impeller 10 rotates forward.
The switching valve 50 does not move because there is very little water leakage from the water, and there is no possibility that the washing water flows out of the sewage discharge port 28.

[Third Embodiment] In the dishwasher pump as in the first and second embodiments, the motor 1
When the rotation of the cleaning water 5 is stopped, the flushing water that once flows out of the flushing water discharge port 26 may flow backward, so that the switching valve 50 is shaken and the sealing property of the switching valve 50 is impaired. Water may temporarily leak from the sewage discharge port 28. In this embodiment, in order to cope with such a problem, the switching valve 50 is always set by the spring to the sewage discharge port 28.
Of the elastic seat 30.

That is, as shown in FIG.
A spring 60 such as a torsion spring is mounted on the rotating shaft 57, one end of which is engaged with the valve plate 56 of the switching valve 50, and the other end is engaged with the inner wall of the casing 20, for example.
The switching valve 50 is always biased toward the elastic seat 30 of the sewage discharge port 28. Thereby, the spherical portion 5 of the switching valve 50
2 is always pressed against the lip 32 of the elastic seat 30 to close the opening 31 thereof.

In the present embodiment configured as described above, the switching valve 50 is normally urged by the spring 60 to close the opening 31 of the elastic seat 30 of the sewage discharge port 28, so that the cleaning is performed. The opening 27 of the water discharge port 26 is open.
Therefore, when the impeller 10 rotates in the forward direction, all of the washing water sucked in from the suction port 25 is pressure-fed from the washing water discharge port 26 to the injection nozzle, and is not drained from the sewage discharge port 28.

When the impeller 10 rotates in the reverse direction, as shown in FIG. 10, the switching valve 50 rotates against the spring 60 by the water pressure of the sewage, and closes the opening 27 of the washing water discharge port 26. The opening 31 of the elastic seat 30 of the sewage discharge port 28 is opened to discharge sewage from the sewage discharge port 28. When the motor 15 stops, the switching valve 50 closes the opening 31 of the elastic seat 30 again by the urging force of the spring 60.

As described above, in this embodiment, when the motor 15 stops, the switching valve 50 automatically closes the opening 31 of the elastic seat 30 of the sewage discharge port 28. Even if the washing water flows backward, the switching valve 50 does not swing, the sealing performance is ensured, and the washing water does not flow out of the dirty water discharge port 28. This embodiment can also be carried out in embodiments 4 and 5 described later.

[Fourth Embodiment] FIG. 11 is a sectional view of a fourth embodiment of the present invention. In this embodiment, the switching valve 50a
Is formed hollow by blow molding with substantially the same outer shape as that of the above-described switching valve 50, and has buoyancy. The operation and effect of the switching valve 50a according to the present embodiment are the same as those of the first embodiment.

[Fifth Embodiment] FIG. 12 is a sectional view of a fifth embodiment of the present invention. In this embodiment, the switching valve 50b
Is made of a material having a specific gravity smaller than 1 and has a solid shape substantially the same as that of the above-described switching valve 50 and has buoyancy. The operation and effect of the switching valve 50b according to the present embodiment are almost the same as those of the first embodiment, but the switching valve 50b can be manufactured by injection molding, so that the cost can be reduced.

[0043]

(1) The dishwasher pump according to the present invention comprises a suction port, a washing water discharge port and a sewage discharge port, and the washing water discharge port or the sewage discharge port according to the forward or reverse rotation of the impeller. A switching valve for discharging washing water or sewage from one of the outlets, the switching valve comprising a valve body having a spherical portion, and a valve plate having a rotary shaft and integrally formed with the valve body. Since the cleaning water or the sewage pumped by the impeller rotates the switching valve, the spherical portion thereof is pressed against the opening of the cleaning water discharge port or the sewage discharge port, and is in line contact with the opening. Because of the blockage, a large sealing effect can be obtained, and the washing water does not leak from the sewage discharge port during washing of tableware and the like.

(2) Since the valve body of the switching valve of the above (1) is formed of an elastic material, the contact with the opening of the washing water discharge port or the sewage discharge port becomes better, and the effect of preventing water leakage increases.

(3) The valve body of the switching valve of (1) or (2) is formed in a substantially U-shape, air is enclosed therein, and the opening is sealed with a lid. The valve is formed by blow molding. (5) Alternatively, since the switching valve is made of a material having a specific gravity of less than 1 to give buoyancy to the switching valve, sewage discharge is performed by washing water pressure during washing of dishes and the like. Since it is pressed against the opening of the outlet, the washing water does not flow out of the wastewater discharge port.

(6) A primary dynamic pressure receiving pressure for receiving a hydraulic pressure when the impeller rotates forward is provided by cutting off a part of the valve body on the side of the washing water flow channel of any one of the above-mentioned switching valves (1) to (5). (7) Alternatively, the valve plate of the switching valve is formed in a frame shape surrounding substantially the center of the outer periphery of the valve body, and the water pressure is generated by the frame-shaped valve plate during forward or reverse rotation of the impeller. Since the primary dynamic pressure receiving surface and the secondary dynamic pressure receiving surface for receiving the pressure are formed, the switching of the switching valve can be reliably performed.

(8) Since the switching valve of any of the above (1) to (7) is constantly biased in the direction of the sewage discharge port by a spring,
During washing of dishes, etc., the switching valve is securely pressed against the wastewater discharge port by the water pressure of the washing water and the urging force of the spring.
It is possible to prevent unstable operation of the switching valve even if the washing water fluctuates when the impeller stops.

(9) Since the openings of the washing water discharge port and the sewage discharge port of the above (1) are formed in a circular shape, and the valve body of the switching valve is brought into linear contact with the openings, the washing water discharge port is formed. And the sealing effect of the sewage discharge port can be improved. (10) In addition, since a plate-like or annular elastic seat having a circular opening is attached to the opening of the sewage discharge port of (9), the switching valve further improves the sealing effect of the sewage discharge port. be able to.

(11) Since the inner diameter of the opening of the elastic seat in (10) is 70 to 90% of the inner diameter of the opening of the sewage discharge port, the static pressure between the sewage flow channel side and the sewage discharge side is set. Due to the difference, the force for pressing the switching valve against the elastic seat body increases, and the sealing effect can be further enhanced. (12) Since the lip is provided on the periphery of the opening of the elastic seat of the above (10) or (11) on the side of the sewage flow channel, the adhesion of the switching valve to the opening of the elastic seat is improved.

(13) A substantially triangular rectifying stage is provided between the impeller of (1) and the switching valve, and an impeller side wall surface corresponding to the rotation locus of the impeller is provided on the impeller side of the rectifying stage. The washing water side wall surface is formed on the side of the washing water flow channel, and the switching valve side wall surface corresponding to the rotation trajectory of the switching valve is formed on the switching valve side, so that tableware with high water supply efficiency and reliable operation of the switching valve is provided. A pump for a washer can be obtained.

(14) A substantially triangular rectifying table is provided between the impeller of (1) or (13) and the switching valve, and the rectifying table corresponds to the rotation locus of the impeller from the top of the sewage flow channel side. A rectifying plate is extended to form a sewage flow water inlet between the tip of the rectifying plate and the inner surface of the peripheral wall, and between the intersection of the impeller side wall surface and the washing water side surface of the rectifying plate and the inner surface of the peripheral wall. The washing water inlet is formed in the cleaning water inlet, and the sewage inlet is formed smaller than the washing water inlet, so that it is possible to prevent the washing water from flowing out of the sewage discharge outlet when the impeller rotates normally.

(15) The primary dynamic pressure when the switching valve closes the opening of the washing water discharge port is defined by the intersection of the washing water side wall surface and the switching valve side wall surface of the flow straightening table of (13) or (14). Since it was located on the side of the washing water flow channel from the pressure receiving surface and the top of the switching valve side wall surface was located on the dirty water flow channel side of the primary dynamic pressure pressure receiving surface when the switching valve closed the waste water discharge port,
During washing of tableware or the like or drainage of sewage, the water pressure of the wash water or sewage effectively acts on the dynamic pressure receiving surface or the valve body, so that the switching valve can be reliably sealed and switched.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention, a part of which is shown in cross section.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of the casing of FIG. 2;

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is a plan sectional view showing a main part of the present embodiment.

FIG. 6 is a front perspective view and a rear perspective view of the switching valve of FIG. 4;

FIG. 7 is an operation explanatory view of the present embodiment.

FIG. 8 is a plan view of a main part of the second embodiment.

FIG. 9 is a plan sectional view of the third embodiment.

FIG. 10 is an operation explanatory view of the present embodiment.

FIG. 11 is a plan sectional view showing a main part of a fourth embodiment.

FIG. 12 is a plan sectional view showing a main part of a fifth embodiment.

FIG. 13 is an explanatory diagram of an example of a conventional dishwasher.

FIG. 14 is a longitudinal sectional view of the pump of FIG.

FIG. 15 is a plan sectional view of FIG.

[Explanation of symbols]

1 pump main body, 2 bases, 5 cylinders, 10 impellers, 15 motors, 20 casings, 23 impeller housings, 24 switching valve housings, 25 inlet for washing water, 26
Wash water outlet, 27, 29 opening, 28 sewage outlet, 30 elastic seat, 31 opening, 32 lip, 3
5 Rectifier board, 35d rectifier plate, 36 impeller side wall surface, 3
7 cleaning water side wall surface, 38 switching valve side wall surface, 40 cleaning water flowing water channel, 41 sewage flowing water channel, 50, 50a, 50b switching valve, 51 valve body, 52, 53 spherical portion, 54 opening,
55 lid, 56 valve plate, 57 rotating shaft, 58 primary dynamic pressure receiving surface, 59 secondary dynamic pressure receiving surface, 60 spring.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takehiko Hara 1728-1 Koeda, Hanazono-cho, Osato-gun, Saitama Prefecture Inside Mitsubishi Electric Home Equipment Co., Ltd. Mitsubishi Electric Home Equipment Co., Ltd. F-term (reference) 3B082 BF00 BF05

Claims (15)

[Claims] 1. A cleaning apparatus comprising a suction port, a cleaning water discharge port, and a sewage discharge port, and discharges cleaning water or sewage from one of the cleaning water discharge port and the sewage discharge port in accordance with forward or reverse rotation of an impeller. Dishwasher, characterized in that the switching valve is constituted by a valve body having a spherical portion, and a valve plate having a rotating shaft and integrally formed with the valve body. For pumps. 2. The dishwasher pump according to claim 1, wherein the valve body of the switching valve is formed of an elastic material. 3. The dishwasher for a dishwasher according to claim 1, wherein the valve body of the switching valve is formed in a substantially U-shape, air is enclosed therein, and an opening thereof is sealed with a lid. pump. 4. The dishwasher pump according to claim 1, wherein the switching valve is formed by blow molding. 5. The dishwasher pump according to claim 1, wherein the switching valve is made of a material having a specific gravity smaller than 1. 6. A primary dynamic pressure receiving surface for receiving a hydraulic pressure when the impeller rotates forward is formed on a side of the switching water valve on a side of a flush water flow channel. 5. The dishwasher pump according to any one of 5. 7. The valve plate of the switching valve is formed in a frame shape surrounding substantially the center of the outer periphery of the valve body, and the primary valve receiving the water pressure when the impeller rotates normally or reversely by the frame-shaped valve plate. A pressure receiving surface and a secondary dynamic pressure receiving surface are formed.
5. The dishwasher pump according to any one of 5. 8. The dishwashing pump according to claim 1, wherein the switching valve is constantly biased toward the sewage discharge port by a spring. 9. The tableware according to claim 1, wherein the openings of the washing water discharge port and the sewage discharge port are formed in a circular shape, and the valve body of the switching valve is brought into linear contact with the openings. Pump for washing machine. 10. The dishwasher pump according to claim 9, wherein a plate-like or annular elastic seat having a circular opening is attached to the opening of the wastewater discharge port. 11. The dishwasher pump according to claim 10, wherein the inner diameter of the opening of the elastic seat is 70 to 90% of the inner diameter of the opening of the sewage discharge port. 12. The dishwasher pump according to claim 10, wherein a lip is provided on the periphery of the opening of the elastic seat body on the switching valve side. 13. A rectifying table having a substantially triangular shape is provided between the impeller and the switching valve, and a side wall surface of the impeller corresponding to a rotation locus of the impeller is provided on the impeller side of the rectifying table. 2. A switching valve side wall surface corresponding to the rotation locus of the switching valve is formed on the side of the washing water, and the switching valve is formed on the switching valve side.
A dishwasher pump as described. 14. A rectifying plate having a substantially triangular shape is provided between the impeller and the switching valve, and a rectifying plate is extended from the top of the rectifying plate on the side of the sewage flow channel corresponding to the rotation locus of the impeller. A sewage water inlet is formed between the tip of the rectifier plate and the inner surface of the peripheral wall, and a rinsing water inlet is formed between the intersection of the impeller side wall surface and the rinsing water side surface of the rectifier and the inner surface of the peripheral wall, 14. The dishwasher pump according to claim 1, wherein the sewage inlet is formed smaller than the washing water inlet. 15. The flush water side wall surface and the switching valve side wall surface of the rectifying table are located closer to the washing water flow channel than the primary dynamic pressure receiving surface when the switching valve closes the opening of the washing water discharge port. The dishwasher according to claim 13 or 14, wherein the top of the side wall surface of the switching valve is located closer to a sewage flow channel than a primary dynamic pressure receiving surface when the switching valve closes a sewage discharge port. Machine pump.