JP2005282376A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device which is advantageous in miniaturizing the pump device, excellent in waterproofness and chemical resistance, and capable of providing high torque with minimized variation in the gap between a stator and a rotor. <P>SOLUTION: The outer periphery part 29 of the rotor 23 is composed of plastic resin, a spiral groove 30 being formed on the outer periphery part 29. The inner side of the stator 22 is provided with a cylindrical cap 31 made of non-magnetic stainless material and covering the stator 22. Cleaning fluid sucked through a suction port part 27 is discharged through a draining port part 28 by means of the rotation of the rotor 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pump device that feeds liquid, and as an example, relates to a pump device that circulates water in a dishwasher in a sink for washing.

  Conventionally, a dishwasher 1 as shown in FIG. 6 is known as an example of a dishwasher. In the dishwasher 1, a sprinkling pipe 3 and a drain pipe 4 for a cleaning liquid are installed inside a washing tank 2, and the sprinkling pipe 3 and the drain pipe 4 are connected to a storage tank 6 of a mechanism unit 5. The storage tank 6 is provided with a water supply pipe 7 for supplying tap water and a drain pipe 8 for draining the cleaning liquid after cleaning.

  The water spray pipe 3 of the mechanism unit 5 is provided with a circulation pump device 9, and the circulation pump device 9 sends the cleaning liquid flowing from the drain pipe 4 into the storage tank 6 to the water spray pipe 3. The drainage pipe 8 is connected to the drainage pump part of the circulation pump device 9 and drains the cleaning liquid in the storage tank 6 after the cleaning process. 10 is a water supply pump provided in the water supply pipe 7, and 11 is tableware.

  FIG. 5 shows a configuration of a conventional circulation pump device 9. The circulation pump device 9 is divided into a pump main body 12 and a motor part 13, and a rotating shaft 15 of a rotor 14 of the motor part 13 extends inside the pump main body 12. The pump body 12 is provided with a suction port 16, a discharge port 17, and a drain port 18 for the cleaning liquid, and the suction port 16 is connected to the bottom of the storage tank 6. The discharge port 17 is connected to the water spray pipe 3, and the drain port 18 is connected to the drain pipe 8. A seal ring SL is provided in two stages at a root portion where the rotating shaft 15 protrudes into the pump main body portion 12, and prevents water from entering the motor portion 13.

  Centrifugal impellers 19 and 20 are attached to a portion of the rotary shaft 15 that protrudes into the pump body 12, and the impeller 19 sucks the cleaning liquid from the suction port 16 and supplies water to the discharge port 17. The impeller 20 sucks the cleaning liquid and drains it to the drain port 18. The sprinkling pipe 3 and the drain pipe 8 are provided with electromagnetic valves (not shown) so that the respective electromagnetic valves are opened and closed according to the time of cleaning and draining in the cleaning tank 2.

  However, in the above-described pump device, since the pump device 9 is divided into the pump main body 12 and the motor portion 13, it becomes longer in the axial direction of the rotary shaft 15, and the washing tank of the dishwasher within a predetermined size is large. It is disadvantageous to make it easier.

  Therefore, in order to provide a water supply function inside the motor casing, a water supply passage is formed in the rotor installation space in the stator, the periphery of the rotor is covered with resin, and a spiral groove for water supply is formed on the outer periphery of the rotor. On the other hand, the surfaces of the stator core, the stator coil, etc. are covered with resin, a water inlet is formed in the vicinity of one bearing part of the rotor in the motor casing, and the water in the vicinity of the other bearing part of the rotor in the motor casing is formed. There is also a pump device with a drain outlet.

In this pump device, when the rotor is rotated by energizing the stator coil, the spiral groove formed on the outer peripheral surface of the rotor rotates, so that water is introduced from the suction port and the water introduced from the drain port is drained. It has become so.
JP 2003-232291 A

  However, in the case of a pump device in which the stator is covered with resin, a spiral groove is formed on the outer peripheral surface of the rotor, and a suction port or a drain port is formed in the vicinity of the bearing portion of the casing, if the resin covering the stator becomes thicker, the rotor and stator When the gap is enlarged, the torque is reduced, and the resin covering the stator is thin, the gap is reduced, but there is a problem in strength. In other words, because dishwashers and other chemicals such as hot water and detergents are used, the gap may not be constant due to the expansion of the resin that covers the stator, and may break due to fatigue due to expansion and contraction. There were problems such as being.

  The present invention has been made paying attention to such problems, is advantageous for downsizing of the pump device, is excellent in water resistance and chemical resistance, and has little fluctuation in the gap between the stator and the rotor. An object of the present invention is to provide a pump device that can obtain a high torque.

  In order to solve the above-described problem, the pump device of the present application is configured such that a rotor is installed inside a stator in a casing, and a rotating shaft of the rotor is supported by the upper and lower portions of the casing, and the upper or lower portion of the casing is supported. A suction port for sucking liquid into the installation space of the rotor is formed in either one of the two, and a discharge port for the liquid is formed in either the upper or lower part of the casing or the outer peripheral surface of the casing. Is a pump device in which a spiral groove is formed in order to suck from the suction port and discharge from the discharge port, and is formed of a non-magnetic material inside the stator and covers the stator with a liquid transport path. A cover material is provided.

  According to the pump device of the present invention, the cover material that is installed inside the stator and covers the stator to form the liquid conveyance path is formed of a non-magnetic material. Even if chemicals or the like are contained, the rupture due to expansion and contraction and the fluctuation of the gap between the rotor and the stator are reduced, and the reliability is improved.

  Hereinafter, the best mode for carrying out the pump device of the present invention will be described based on examples.

  FIG. 1 shows a pump device according to an embodiment of the present invention. As an example, the pump device P is used in a household dishwasher (see the dishwasher 1 in FIG. 6), and corresponds to the pump device 9 in FIG. Since this pump device P can improve the pumping capacity of the rotor 23 installed in the stator 52, when used in the dishwasher 1, the pump device P itself is downsized and a washing tank for washing dishes. This is advantageous in increasing the size of the.

  The main configuration of the pump device P will be described in brief. The pump device P has a rotor 23 installed inside a stator 52 in the casing 21, and the rotating shaft 24 of the rotor 23 has bearing portions 25 on the upper and lower sides of the casing 21. 26. In the upper part of the casing 21, a suction port portion 27 is formed for sucking liquid into the space R <b> 1 where the rotor 23 is installed. A drain port 28 for cleaning liquid, which is a liquid, is formed at the lower part of the outer peripheral surface of the casing 21.

  The rotor 23 is an impeller made of plastic resin, and a spiral groove 30 is formed in the outer peripheral portion 29 of the rotor 23 so as to be sucked from the suction port portion 27 and discharged from the drain port portion 28. A cylindrical cap 31 is provided on the inner side of the stator 52. The cylindrical cap 31 is made of a non-magnetic metal and covers the stator 52 and forms a cleaning liquid conveyance path.

  As shown in FIG. 2, the cylindrical cap 31 is formed of a cylindrical cap, and is formed of a nonmagnetic material (paramagnetic material) that is not magnetized in a magnetic field or that does not attract a magnet. The cylindrical cap 31 is desirably formed of a metal in terms of strength in consideration of deformation due to a temperature difference of the liquid flowing in the water channel. Examples of the non-magnetic metal include aluminum, aluminum alloy, titanium, titanium alloy, Duralumin, copper, copper alloy, non-magnetic stainless steel (for example, austenitic stainless steel) and the like can be raised. The cylindrical cap 31 is not limited to a metal as long as strength is ensured, and may be formed of a non-metal such as ceramic, for example. Further, the cylindrical cap 31 may be a rust preventive treatment by coating the surface of the non-magnetic material with a plastic (PET or the like) film.

  Below, the pump apparatus P is demonstrated in detail. The casing 21 is composed of an upper casing 21A and a lower casing 21B, and the upper casing 21A and the lower casing 21B are coupled by screwing in a bolt B1.

  A concave portion 27B into which the base portion 27A of the suction port portion 27 is fitted is formed in the upper portion of the upper casing 21A. A groove is formed in the base portion 27A of the suction port 27, and a seal ring S1 is installed in the groove. The base 27A and the bottom of the recess 27B are joined together by screwing a bolt B2. The suction port 27 is connected directly or indirectly to the drain pipe 4 extending from the washing tub 6 of the dishwasher in FIG. 6 so that the washing liquid enters the casing 21.

  An opening 32 that communicates with the suction port 27 is formed on the upper surface of the upper casing 21A. The opening 32 has a fan-like planar shape, and a plurality of openings are formed. A plate-like rib 32A is formed between the adjacent openings 32, and the inner wall surface 32B of the opening 32 and the inner bearing 25 are connected by the rib 32A. A rotating shaft 24 of the rotor 23 is supported by a bearing portion 25.

  The bearing portion 25 is formed in a substantially cylindrical shape, and the rotating shaft 24 is rotatably held by the sealing material 25A. Between the bearing portion 25 and the inner wall surface 32A, there is an opening 32 through which the cleaning liquid passes. The suction port 27 communicates with the space R1 in which the rotor 23 is accommodated through the opening 32, and the cleaning liquid can enter the space R1 in which the rotor 23 is installed through the opening 32. .

  A stator core 22 for forming a plurality of magnetic poles is fixed inside the upper casing 21 </ b> A, and a space facing each stator core 22 is a space R <b> 1 that houses the rotor 23. The stator coil 34 is wound around the outer peripheral portion of each stator core 22 with an insulator 33 interposed therebetween to form a stator 52.

  The cylindrical cap 31 defines a space R2 in which the stator 52 is installed and a space R1 in which the rotor 23 is installed. As shown in FIG. 2, a flange 35 that protrudes to the inside of the cylindrical body is formed at the top of the cylindrical cap 31, and a flange 36 that protrudes to the outside of the cylindrical body is formed at the bottom of the cylindrical cap 31. . The opening 35A on the inner side of the flange 35 is fitted with the rib 32A. A seal ring 32C is attached to the outer periphery of the rib 32A. The collar portion 35 can be inserted outside the rib 32A, and the seal ring 32C seals the outside of the rib 32A.

  The flange portion 36 formed at the lower portion of the cylindrical cap 31 is supported in close contact with an attachment surface 37 formed at the upper portion of the lower casing 21B. A plurality of hole portions 36 </ b> A (see FIG. 2) are opened in the flange portion 36. The flange 36 is fixed to the lower casing 21B by passing the bolt B3 through the hole 36A and screwing the bolt B3 into the bolt hole of the lower casing 21B. A ring-shaped groove 38 surrounding the rotor installation hole 37A (see FIG. 1) is formed in the mounting surface 37 of the lower casing 21B, and a seal ring 39 is held in the groove 38. The flange portion 36 is in close contact with the mounting surface 37 via a seal ring 39, and the inside and outside of the cylindrical cap 31 are blocked.

  As shown in FIG. 4, permanent magnets 40 and 41 protruding in a direction orthogonal to the rotation shaft 24 are attached to the rotation shaft 24 of the rotor 23, and the rotor 23 can be rotated by energization control of the stator coil 34. ing. The periphery of the rotor 23 is covered with plastic, and a spiral groove 30 is dug on the peripheral surface of a cylindrical outer peripheral portion 29 formed of this plastic. The spiral groove 30 sucks the cleaning liquid from the suction port 27 and discharges it from the drain port 28 by the rotation of the rotor 23. The lower portion of the outer peripheral portion 29 is enlarged, and the enlarged portion 42 increases the drainage capacity of the rotor 23. The spiral groove 30 is formed up to the end of the enlarged portion 42. The gap between the outer peripheral portion 29 of the rotor 23 and the cylindrical cap 31 is set so that the gap between the permanent magnets 40 and 41 of the rotor 23 and the stator 22 is as small as possible.

  A bearing attachment plate 43 is attached to the lower portion of the lower casing 21B with bolts B4. The lower portion of the lower casing 21 </ b> B and the bearing mounting plate 43 form a water supply passage 44 for sending the cleaning liquid conveyed by the spiral groove 30 to the drain port portion 28. The water supply passage 44 has a substantially flat donut shape. The water supply passage 44 is connected to the drain outlet portion 28, and the cleaning liquid sent into the water supply passage 44 is conveyed to the drain outlet portion 28. A lower bearing portion 26 is provided at the center of the bearing mounting plate 43, and the rotating shaft 24 is held by the bearing portion 26.

  A drainage channel forming plate 45 is further attached to the lower surface portion of the lower casing 21 </ b> B and the lower side of the bearing mounting plate 43. The drainage channel forming plate 45 is fixed to the lower surface of the lower casing 21B by a bolt B5. A seal ring 46 seals between the drainage channel forming plate 45 and the lower casing 21B.

  A circular recess 48 that forms the drainage channel 47 is formed at the center of the drainage channel forming plate 45, and the upper part of the recess 48 is closed by a cover 49. The rotation shaft 24 passes through the center portion of the cover 49, and the lower end portion of the rotation shaft 24 projects into the recess 48. A drain plate 50 is attached to the lower end of the rotating shaft 24. The plane shape of the drainage plate 50 has a substantially cross shape, is supported by the rotary shaft 24 in a state of being prevented from rotating, and is fixed by a nut 51. The drainage channel 47 is connected to the drainage pipe 8 shown in FIG. 6 so that the cleaning liquid can be drained.

  In this pump device P, a suction port 27 and an opening 32 are formed in the upper part of the casing 21, a drain port 28 is formed in the lower part of the casing 21, and a cylindrical cap is installed in a space R 1 in which the rotor 23 in the casing 21 is installed. 31, the inside of the cylindrical cap 31 is used as a passage for the cleaning liquid, the spiral groove 30 is formed in the outer peripheral portion 29 of the rotor 23, and the permanent magnets 40 and 41 driven by the energization of the stator coil 34 are provided in the rotor 23. When the rotor 23 is rotated by energization control of the stator coil 34, the cleaning liquid enters the cylindrical cap 31 from the suction port 27 through the opening 32 and is drained by the rotation of the spiral groove 30 of the rotor 23. It is sent out to the mouth portion 28. The cleaning liquid conveyed to the drain port portion 28 is sent to the cleaning tank 2 (see FIG. 6) via the water spray pipe 3 (see FIG. 6), and the dishes are cleaned.

  In this case, since the cylindrical cap 31 that partitions and seals the space R1 and R2 is formed of nonmagnetic stainless steel, the gap between the rotor 23 and the stator 52 can be reduced, and the rotation of the rotor 23 can be reduced. There is no fear of securing, rusting or scratching.

  Further, the lower casing 21B and the upper casing 21A can be separated by removing the bolt B1, and the cylindrical cap 31 can be removed by removing the bolt B3, so that the bearings 25 and 26 or the rotor 23 and the cylindrical cap 31 can be easily cleaned and replaced. is there.

  In this embodiment, the pump device 1 is used for the dishwasher 1, but the use of the pump device P is not limited to this, and may be used for other things.

Sectional drawing which shows the structure of the pump apparatus concerning the Example of this invention. The perspective view of the cylindrical cap installed in a pump apparatus inside. The perspective view of the rotor which formed the spiral groove in the outer peripheral part. The partial cross section figure of a rotor. Sectional drawing of the conventional pump apparatus provided in the dishwasher. Explanatory drawing which shows an example of a structure of a dishwasher.

Explanation of symbols

P Pump device 21 Casing 22 Stator 23 Rotor 25 Bearing portion 25A Sealing material 26 Bearing portion 27 Suction port portion 28 Drain port portion 29 Outer peripheral portion 30 Spiral groove 31 Stainless steel cylindrical cap 44 Water supply path R1 Rotor installation space R2 Stator installation space

Claims (1)

  A rotor is installed inside the stator in the casing, the rotating shaft of the rotor is supported by the upper and lower portions of the casing, and suction is performed to suck liquid into the rotor installation space in either the upper or lower portion of the casing. Forming a mouth, forming the liquid discharge port on either the upper or lower part of the casing or the outer peripheral surface of the casing, and sucking from the suction port into the outer peripheral surface of the rotor; A pump device in which a spiral groove is formed for discharging, and is provided with a cover material that is formed of a non-magnetic material inside the stator and covers the stator to form a liquid transport passage. .

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