JP4121290B2 - Pump and dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention selects a water suction port and a discharge port in accordance with forward or reverse rotation of an impeller, absorbs and discharges a fluid, and circulates wash water using the pump in the apparatus to drain waste water. Related to the machine.
[0002]
[Prior art]
Conventionally, the pump used in the dishwasher is a single pump in order to satisfy the function of circulating the wash water in the apparatus to wash the dishes and rinsing the dishes, and the function of draining the sewage after washing to the outside. Two types of impellers and two water inlets and outlets are provided, and two types of impellers are used properly according to the forward or reverse rotation of the motor, and washing water or sewage is sucked into the pump from one water inlet. And the pump which discharges washing water or sewage from one discharge port following the water absorption port is used.
[0003]
One example of the above-described conventional pump will be described with reference to a pump longitudinal sectional view of FIG.
[0004]
A pump 100 shown in FIG. 3 includes a motor 111 disposed in a motor unit 110 covered with an outer shell 118, and the motor unit 110 and the pump unit 120 are connected in a horizontal shape with a packing 155 interposed therebetween to constitute a pump. The pump chamber 120 includes two types of impellers, two pump chambers, a water suction port that discharges and discharges fluid using the two types of impellers, and a flow path thereof.
[0005]
The motor 111 includes a stator 112 disposed on the inner periphery of the outer shell 118 and a rotor 113 disposed on the inner side of the outer shell 118. The rotor 113 has rotating shafts 114 disposed on both sides of the outer shell 118. Further, an AC induction motor is provided that is rotatably supported by the bearings 115 and 116 and includes a cooling fan 117 outside the outer shell 118.
[0006]
The pump unit 120 is formed by a casing (A) 151 and a casing (B) 152 sandwiching a partition wall 153 and partitioning a normal rotation pump chamber 121 and a reverse rotation pump chamber 122, and is coaxial with the rotation shaft 114 of the motor 111. The forward rotation impeller 122 and the reverse rotation impeller 132 are provided in the forward rotation pump chamber 121 and the reverse rotation pump chamber 131, respectively. The reversing discharge port 124 is provided, and the reversing pump chamber 131 is provided with a reversing water suction port 133 and a reversing discharge port 134.
[0007]
In the conventional pump 100, when the motor 111 is rotating forward, the fluid sucked from the forward water suction port 123 by the suction action of the forward rotation impeller 122 flows into the forward rotation pump chamber 121 through the flow path 125. A swirling flow is generated in the chamber 121 and is discharged out of the pump 100 from the forward discharge outlet 124.
[0008]
On the other hand, when the motor 111 rotates in the reverse direction, the fluid sucked from the reverse rotation water intake port 133 by the suction action of the reverse rotation impeller 132 flows into the reverse rotation pump chamber 132, and the water in the pump chamber passes through the impeller 132 due to its viscosity. Then, a vortex is generated and discharged from the reverse discharge port 134 to the outside of the pump.
[0009]
At the time of forward rotation and reverse rotation, the two types of impellers 122 and 132 rotate at the same time. Depending on the direction of rotation, suction and discharge operations are generated only on one impeller, and the two pump chambers are separated by a partition wall 153. Since it is partitioned, fluid does not mix between the pump chambers, and the water discharge operation is performed only by one impeller.
[0010]
A conventional pump 100 having a pump structure in which the motor unit 110 and the pump unit 120 are connected in a horizontal shape as described above is installed in a horizontal shape in the dishwasher, and the forward rotation impeller 122 functions and cleans the dishes. In general, water is circulated, and the reverse impeller 132 functions to discharge sewage out of the apparatus during drainage.
[0011]
In the conventional dishwasher using the pump 100, since the reverse suction port 133 is not located at the bottom of the reverse pump chamber 131, the air is pumped when the water flowing into the pump chamber 131 gradually decreases during the drainage operation. It mixes in the chamber 131 and generates a so-called “air biting”, which causes noise.
[0012]
Furthermore, the wastewater from the sewage becomes insufficient after washing, and a large amount of residual water remains in the dishwasher, which is unfavorable for hygiene and causes bad odor.
[0013]
Further, in the pump 100 having the above-described structure, the blade diameter of the reverse rotation impeller 132 is limited by the water suction port 133 and the discharge port 134 provided in the reverse rotation pump chamber 131, and it is necessary to increase the rotation of the impeller during drainage. The noise generation is further increased.
[0014]
In addition, the motor unit 110 provided with the AC induction motor 111 in a horizontal shape takes up a space to increase the size of the pump, and the piping around the pump also takes up space, and the dishwasher is not compact. There are also problems of electric leakage and electric shock due to water leakage.
[0015]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, reduces the noise by improving the pump structure, and improves the water discharge capacity of the pump, in particular to improve drainage and noise generation during drainage, Another object of the present invention is to provide a low-noise and hygienic dishwasher that is suitable for a dishwasher that achieves a small size and light weight, and that is excellent in washing performance and drainage using the pump.
[0016]
[Means for Solving the Problems]
The invention of claim 1 includes a motor unit, and a pump unit having a discharge port and two water intake ports. In the motor unit, a rotor is rotatably arranged on an inner periphery of the stator, and the pump And an impeller having a forward rotation blade and a reverse rotation blade connected to a rotation shaft of the rotor, and the pump portion includes a forward pump chamber and a reverse pump chamber partitioned by a partition wall. The forward rotation impeller is disposed in the forward rotation pump chamber, the reverse rotation impeller is disposed in the reverse rotation pump chamber, and the forward rotation pump chamber is disposed on the rotation axis. The reverse pump chamber has a reverse water intake, and the partition wall has a forward pump chamber opening for allowing fluid to flow into the forward pump chamber, The reversing impeller includes the forward rotation water inlet and the forward rotation at the periphery of the rotating shaft. A passage hole through which fluid flows in communication with the pump chamber opening, and during normal rotation of the impeller, fluid from the forward suction port is allowed to flow through the forward hole and the forward pump chamber opening. The pump is characterized in that it is sucked into the diversion pump chamber and sent to the discharge port, and when the impeller is reversely rotated, the fluid from the reverse rotation water intake port is sucked into the reverse rotation pump chamber and sent to the discharge port.
[0017]
According to the pump of the present invention, the forward rotation pump chamber formed at the upper part of the pump portion is constituted by the motor portion and the pump portion provided with the two water intake ports. The fluid from the forward rotation pump chamber opening of the partition wall and the passage hole provided in the reverse rotation impeller communicating therewith is sent to the discharge port. In the reverse rotation pump chamber, the fluid from the reverse rotation water intake port is discharged from the discharge port. Therefore, the pump structure is made compact and lightweight, while improving the water absorption and discharge performance of the pump, reducing the amount of remaining water in the device where the pump is installed, and preventing noise from entering the pump. can do. Moreover, since the diameter of the impeller can be designed larger than that of the conventional structure, the pump performance can be maintained even at low speed rotation, and noise generation can be suppressed. Furthermore, since the motor part is located above the flow path, it is possible to prevent electric leakage and electric shock due to water leakage.
[0018]
According to a second aspect of the present invention, the forward rotation pump chamber has a forward rotation discharge port, the reverse rotation pump chamber has a reverse rotation discharge port, and the forward rotation of the impeller from the forward rotation water intake port. Is sucked into the forward pump chamber through the passage hole and sent to the forward discharge port, and when the impeller rotates in the reverse direction, the fluid from the reverse suction port is sucked into the reverse pump chamber. The pump according to claim 1, wherein the pump is sent to the reverse discharge port.
[0019]
In the pump according to the present invention, the forward rotation flow path and the reverse rotation flow path of the impeller are clearly separated, and the flowing water flows through the dedicated flow path, so that the two kinds of fluids are not mixed. Therefore, in the dishwasher using this pump, the washing water supply path is separated from the sewage drainage path, and the washing water washing ability is sufficiently reduced.
[0020]
According to a third aspect of the present invention, in the pump portion, the forward pump chamber partitioned by a partition wall is disposed at an upper portion, the reverse pump chamber is disposed at a lower portion, and the reverse impeller is connected to the reverse pump. The pump according to claim 1, wherein the pump is disposed in a chamber.
[0021]
In the pump of the present invention, since the reverse rotation impeller is arranged in the reverse rotation pump chamber at the lower part of the pump unit, the water absorption and discharge performance during the reverse rotation operation is further improved, and the remaining water amount in the apparatus in which the pump is installed is reduced. In addition, the noise can be reduced by preventing air from entering the pump.
[0022]
The invention according to claim 4 is the pump according to any one of claims 1 to 3, wherein the forward discharge outlet is opened upward of the pump.
[0023]
In the pump of the present invention, fluid is discharged upward of the pump during forward rotation of the impeller. Therefore, in the dishwasher using this pump, the discharge port of the pump can be directly connected to the tower nozzle of the dishwasher, the pressure loss of the washing water can be prevented, and the washing water injection force to the dishes can be maintained at a high pressure. .
[0024]
According to a fifth aspect of the present invention, a substantially cylindrical guide for guiding fluid from the normal rotation water suction port to the forward rotation pump chamber opening is provided around the passage hole of the reverse rotation blade. The pump according to any one of claims 1 to 4, wherein the pump is provided toward the opening.
[0025]
In the pump according to the present invention, the fluid from the forward suction port can be allowed to flow into the forward pump chamber without waste through the forward pump chamber opening provided in the passage hole of the reverse impeller and the partition wall. .
[0026]
A sixth aspect of the present invention is the pump according to any one of the first to fifth aspects, wherein the partition wall has a stepped structure having steps on the periphery of the rotating shaft and on the outer periphery thereof.
[0027]
In the pump of the present invention, the two steps of the impellers arranged in the upper and lower pump chambers can prevent mutual interference caused by simultaneous rotation and ensure the water discharge performance by the step provided on the partition wall. it can. In addition, it is possible to secure a sufficient flow path for the reverse flow path.
[0028]
The invention of claim 7 is characterized in that a filling portion for preventing air accumulation is provided in a space between the upper part of the forward rotation blade and the forward rotation pump chamber. It is a pump of description.
[0029]
In the pump according to the present invention, the air reservoir in the forward rotation pump chamber can be eliminated, and the fluid flow in the pump chamber can be smoothed to improve the pump performance.
[0030]
The invention according to claim 8 is the pump according to any one of claims 1 to 7, wherein the motor section constitutes a brushless DC motor.
[0031]
In the pump of this invention, since the pump is driven and controlled by a brushless DC motor, it is easy to control the rotational speed and direction of the pump, and it is effective in reducing noise by low-speed operation. Miniaturization can be achieved. Furthermore, the motor part can be molded to improve water resistance and insulation.
[0032]
A ninth aspect of the present invention is the pump according to any one of the first to eighth aspects, wherein the forward rotation blade is a Hugal type, and the reverse rotation blade is a Wesco type.
[0033]
In the pump of the present invention, the fugal blade efficiently generates a swirl flow in the pump chamber, and the Wesco blade generates a vortex flow to send the fluid to the discharge port, thereby improving the pump water discharge and making the impeller compact. Can be
[0034]
A tenth aspect of the present invention is the pump according to the ninth aspect, wherein the forward rotation blade is a semi-open type.
[0035]
In the pump according to the present invention, the forward impeller has a more compact structure, and a swirling flow can be efficiently generated in the pump chamber, and the water discharge performance of the pump can be maintained.
[0036]
The invention of claim 11 is a dishwasher having a built-in pump for supplying washing water to a washing tank and sending washed wastewater to a drain outlet. The pump according to any one of claims 1 to 10. It is a dishwasher characterized by being.
[0037]
According to the dishwasher of the present invention, cleaning water can be effectively washed by supplying cleaning water to the washing tub when the pump is rotated forward, and dirty water can be efficiently drained during reverse rotation. It is possible to obtain a compact dishwasher that reduces the occurrence of water and is hygienic.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0039]
(First embodiment)
FIG. 1 is a longitudinal sectional view of a pump 1 according to an embodiment.
[0040]
In the pump 1, a motor unit 10 and a pump unit 20 having two water intake ports 25 and 35 and discharge ports 26 and 36 at a pump bottom portion are vertically integrated. That is, the motor unit 10 is disposed on the upper part of the pump unit 20.
[0041]
In the motor unit 10, a stator 11 including a stator core 12 arranged in a ring shape and a coil 13 wound around the stator core 12 is provided, and a circuit board 14 for driving and controlling the motor is arranged below the stator 12. The whole is molded by the mold resin 15.
[0042]
Further, the rotor 16 having the magnetic body 17 along the inner periphery of the stator 11 is supported by bearings 19a and 19b disposed on the upper and lower outer shells 54 and 56 of the motor unit 10 via the rotating shaft 18, and the motor It is rotatably arranged at the center of the part 10.
[0043]
Therefore, the motor unit 10 constitutes a brushless DC motor.
[0044]
The pump unit 20 is formed by a casing (A) 51 and a casing (B) 52, and the pump unit 20 is partitioned up and down by a partition wall 40 to partition a forward pump chamber 21 and a reverse pump chamber 31. The oil seal 57 disposed in the casing (A) 51 is secured to the lower side of the motor unit 10 to secure the waterproof property of the rotary shaft 18 portion, and constitutes the pump 1.
[0045]
In the pump unit 20, a forward rotation impeller 22 having a Hugal-shaped blade 23 connected to the rotation shaft 18 of the rotor 16 is disposed in the forward rotation pump chamber 21, and is coaxially connected to the rotation shaft 18 with a partition wall 40 interposed therebetween. A reverse impeller 32 having the Wesco-shaped blade 33 is disposed in the reverse pump chamber 31.
[0046]
The forward rotation impeller 22 is formed in a semi-open type in which a fugal blade 23 is provided below the impeller base 24 connected to the rotary shaft 18.
[0047]
The normal rotation pump chamber 21 has a normal rotation water intake port 25 that opens downward at the bottom of the pump portion 20 on the rotation axis 18, and is provided in the passage hole 41 of running water provided in the partition wall 40 and the reverse rotation impeller 32. A flow path 45 communicating from the water suction port 25 to the forward rotation pump chamber 21 through the flowing water passage hole 34 is formed.
[0048]
In addition, a cylindrical shape for guiding fluid from the forward rotation water suction port 25 to the passage hole 34 and the forward rotation pump chamber opening 41 of the partition wall 40 is provided in the periphery of the reverse impeller 32 around the passage hole 34. A guide 38 is provided toward the opening of the forward rotation suction port 25 to prevent the fluid sucked from the forward rotation suction port 25 from flowing into the reverse rotation pump chamber 31, and the passage hole 34 and the forward rotation pump chamber opening 41 are formed. Then, it passes through the flow path 45 and flows into the forward pump chamber 21 without waste.
[0049]
The forward rotation pump chamber 21 is provided with a filling portion 53 for preventing air accumulation in a space generated between the forward rotation impeller 22 and the upper wall surface of the pump chamber 21.
[0050]
Further, the partition wall 40 has a stepped structure having a step 42 on the periphery of the rotating shaft 18 and on the outer periphery thereof.
[0051]
The forward discharge port 26 opens at the tip of the discharge pipe 28 following the discharge hole 27 from the forward pump chamber 21 toward the upper side of the pump, and bends approximately 90 degrees from the discharge hole 27 of the forward pump chamber 21. A flow path 46 toward the discharge port 26 is formed.
[0052]
The reversing pump chamber 31 has a reversing water suction port 35 that opens downward at the bottom of the pump unit 20, and the fluid from the water sucking port 35 is discharged from the reversing pump chamber 31 by the water feeding action of the reversing impeller 32. A flow path 47 is formed to be sent to the reverse discharge port 36 through 37.
[0053]
In the pump 1 having the above-described configuration, the motor unit 10 formed of a brushless DC motor and the pump unit 20 provided with two water inlets 25 and 35 at the bottom of the pump unit 20 are configured in a vertical shape. In the forward rotation pump chamber 21 formed in the forward flow, the fluid from the forward rotation water suction port 25 flows in through the passage hole 34 provided in the reverse rotation impeller 32 and the forward rotation pump chamber opening 41 of the partition wall 40 communicating therewith, The semi-open type fugal blade 23 is sent to the forward discharge port 26 by the centrifugal action. In the reverse pump chamber 31, the fluid from the reverse suction port 35 is sent to the reverse discharge port 36 by the water feeding action of the Wesco blade 33. As a result, the impeller becomes compact, the volume occupied by the pump unit 20 is reduced, and the motor connected to the conventional horizontal shape is no longer necessary. It is possible to quantify.
[0054]
In addition, since the two water inlets 25 and 35 are located at the bottom of the pump 1 and open downward, the water absorption of the pump 1 is improved, air mixing into the pump 1 is prevented, noise is reduced, And the amount of residual water in the apparatus using this pump 1 can be reduced. Further, since the diameter of the impeller, particularly the diameter of the reverse impeller 22 can be designed to be larger than that of the conventional structure, the pump performance can be maintained even at low speed rotation, and noise generation can be suppressed.
[0055]
Further, the filling portion 53 in the space portion of the forward pump chamber 21 eliminates air accumulation in the pump chamber 21 and smoothes the flow of fluid.
[0056]
In addition, the partition wall 40 having a stepped structure can exhibit the pump performance by avoiding mutual interference between two impellers that are arranged in the upper and lower pump chambers by the step 42 and rotate at the same time. Thus, a sufficient flow path for reversing can be secured to effectively generate vortex flow.
[0057]
Since the forward discharge port 26 is opened upward from the pump, fluid is discharged toward the upper side of the pump 1 during forward operation, and the discharge port 26 is directly connected to the tower nozzle of the dishwasher. It is possible to prevent the pressure loss of the washing water and maintain the washing water injection force to the dishes. Of course, the direction of the discharge port can be changed depending on the structure of the dishwasher and the use of the pump.
[0058]
In addition, since the pump 1 is driven and controlled by a brushless DC motor, the rotation speed and direction of the pump 1 can be easily controlled, and the noise can be reduced by low-speed operation, and the motor unit can be made compact. In addition, the pump can be reduced in size, and the motor unit 10 can be molded to improve water resistance and insulation, and the life of the pump can be extended. Moreover, since the motor part 10 is located above the pump part 20, it is also possible to prevent electric leakage and electric shock due to water leakage from the flow path.
[0059]
In the pump 1, rotating magnetism is generated by energization of the motor unit 10, the rotor 20 is driven, and the rotation of the impeller connected to the rotating shaft 18 selects a water inlet according to the rotation direction of the pump 1. Suction is performed and water discharge operation is performed.
[0060]
During normal rotation of the rotor 16, the forward rotation impeller 22 works, and the fluid sucked from the forward rotation water intake port 25 passes through the passage hole 34 of the reverse rotation impeller 32 and the forward rotation pump chamber opening 41 of the partition wall 40. Then, it flows into the pump chamber for normal rotation, and a swirling flow is generated in the pump chamber 21 by the centrifugal action of the Hughal blades 23. Discharged.
[0061]
During the forward rotation, the fluid sucked from the water suction port 25 flows through the flow path 45 by the suction action of the forward rotation impeller 23, and therefore hardly flows into the reverse rotation pump chamber 31 due to the water force.
[0062]
Further, the Wesco blade 33 of the reverse rotation impeller 32 also rotates at the same time. However, since the suction action to the reverse rotation pump chamber 31 is weak, the flow rate is small and no vortex is generated by the Wesco blade 33, and the forward rotation impeller 22 is generated. Only the water discharge action of the works.
[0063]
When the rotor 16 rotates in reverse, the reversing impeller 32 works, sucks the fluid from the reversing water suction port 35 into the reversing pump chamber 31, and causes the fluid vortex to flow after the Wesco-shaped blade 33 passes through the pump chamber 31. It is generated and discharged from the discharge hole 37 to the outside of the pump chamber 31, and the fluid is discharged from the discharge port 36.
[0064]
At the time of the reverse rotation, the fluid sucked from the water suction port 35 mainly flows in the outer peripheral portion of the pump chamber 31 in accordance with the vortex generated by the Wesco-shaped blade 33 provided on the outer peripheral portion of the reverse rotation impeller 32. The normal rotation pump chamber opening 41 of the partition wall provided at the center of 31 does not flow into the normal rotation pump chamber 21.
[0065]
Further, during the reverse rotation, the forward rotation impeller 22 also rotates in the same manner as described above. However, the forward rotation of the fugal blade 23 does not generate suction or centrifugal action, so that no fluid flows in from the forward rotation water inlet 25. .
[0066]
Therefore, in the pump 1, the forward flow path and the reverse rotation flow path of the impeller are separated from each other. Therefore, the flowing water flows through the dedicated flow path during the forward rotation and reverse rotation, so that the two kinds of fluids are discharged without mixing. Sent to the exit. Therefore, in the dishwasher using this pump, the washing water supply channel is clearly separated from the dirty water channel, and the washing water cleaning ability is sufficiently reduced without being deteriorated.
[0067]
In addition, during both the forward and reverse rotations, the pump water inlet is located at the bottom of the pump and opens downward, improving water absorption, reducing the amount of residual fluid and efficiently sucking and discharging fluid. Since it is sent to the outlet, the intrusion of air into the pump 1 can be prevented, the occurrence of so-called “air biting” due to the mixing of fluid and air can be prevented, and the noise of the pump can be greatly reduced.
[0068]
(Second Embodiment)
FIG. 2 is a schematic diagram illustrating the structure of the dishwasher 2 according to the second embodiment.
[0069]
The dishwasher 2 is a dishwasher that incorporates the pump 1 as a pump that supplies washing water for washing dishes to the washing tank and sends the washed dirty water to a drain outlet.
[0070]
As shown in the figure, the dishwasher 2 includes a sealable washing tub 61 having an openable / closable door 60 for putting in and out the dishes 63 as washing objects on the front surface, and a table 62 in the washing tub 61. A rack 64 for setting tableware 63 to be installed, a water tank 67 for collecting and storing the washing water 65 and the washed dirty water 66 arranged at the bottom of the apparatus, and a lower central part of the washing tank 61 are provided. A rotary tower nozzle 68 provided with a plurality of injection holes 69 for the cleaning water 65, a pump 1 for supplying the cleaning water 65 to the tower nozzle 68 and discharging the cleaned sewage 66 to the outside of the machine, and a tableware 63 after the cleaning A hot air fan for drying 71, an exhaust duct 72 for discharging the hot air to the outside of the machine, and a microcomputer for controlling the entire dishwasher 2 such as washing, rinsing, drying, and operation of the pump 1 In The control circuit 73 is built in the main body of the dishwasher 2, and an operation panel 74 having a switch for selecting a washing course and manual operation by the automatic operation of the dishwasher 3 and a display lamp is provided on the outer front surface of the apparatus. It has been.
[0071]
The pump 1 is installed in the upper part of the water tank 67, the normal rotation water inlet 25 and the reverse water inlet 35 are extended to the vicinity of the bottom of the water tank 67, and the forward discharge outlet 36 opened upward is a supply pipe to the tower nozzle 68. 77, the reverse discharge port 36 is connected to a drain pipe 76 for draining the sewage after washing. In addition, a water supply pipe 75 from a tap water or a water heater for supplying the cleaning water 65 to the water tank 67 is disposed in the water tank 67. In the dishwasher 2 configured as described above, after a rack 64 storing the dishes 63 is arranged at a predetermined position on the table 62, a predetermined amount of washing water 65 is supplied from the water supply pipe 75 to the water tank 67 in which the detergent for tableware is introduced. After being accumulated, the operation of the pump 1 is started.
[0072]
The washing water 65 sucked from the water suction port 25 by the forward rotation operation of the pump 1 becomes pressurized water by the discharge action of the pump 1, is discharged from the discharge port 36, is pumped through the supply pipe 77, and is a rotatable tower nozzle. The tableware 63 is washed by being randomly injected from the plurality of injection holes 69 provided in the table 68 to the tableware 63.
[0073]
Subsequently, the rinsing step is the same operation as the washing step, and tap water is used as the washing water. The tap water stored in the water tank 67 by the normal rotation operation of the pump 1 is sucked into the pump 1 and the tower. Rinse water is sprayed to the tableware 63 from the injection hole 69 of the nozzle 68 to wash away the detergent and food residues adhering to the tableware 63 in the washing step, and then the rinse collected in the water tank 67 by the reverse operation of the pump 1 The sewage after completion is discharged from the drain pipe 76 to the outside of the apparatus.
[0074]
When the washing and rinsing steps are completed, the drying fan 71 provided on the side wall of the washing tub 61 is activated, the hot air circulates in the washing tub 61, the dishes 63 are dried, and a series of dishwashing steps is completed. .
[0075]
In the dishwasher 2, the two water inlets 25 and 35 of the pump 1 are opened at the bottom of the water tank 67, and the water absorption and water discharge are improved by the improvement of the pump structure described in the first embodiment. Therefore, it is possible to improve the washing performance and drainage of the dishwasher, and to prevent the occurrence of “air biting” in which air enters the pump 1 and mixes with water, thereby reducing the noise of the apparatus. Can be achieved. In particular, drainage is greatly improved over conventional pumps, and is effective in reducing noise during sewage drainage.
[0076]
Further, the impeller diameter of the pump 1 can be designed to be larger than that of the prior art, so that low speed operation is possible, and driving of the pump by a brushless DC motor has an effect of reducing noise.
[0077]
Moreover, since the drainage property of the pump is improved, the amount of residual water in the apparatus is reduced, the hygiene is improved, and the problem of bad odor generation is also improved.
[0078]
And since the pump structure is constructed vertically and is small and light, and the durability of the motor part is improved, the dishwasher can be made compact and the durability can be improved.
[0079]
【The invention's effect】
As described above, according to the present invention, a compact, lightweight, and highly durable pump that can improve the water absorption and discharge performance of the pump and reduce noise generation due to the intrusion of air into the pump. Is obtained.
[0080]
The dishwasher using this pump is a compact and long-life dishwasher that has quiet operation noise, is particularly excellent in sound reduction during drainage, and is hygienic.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a pump according to a first embodiment.
FIG. 2 is a schematic structural view of a dishwasher according to a second embodiment.
FIG. 3 is a longitudinal sectional view of a conventional pump.
[Explanation of symbols]
1 …… Pump
2 ... Dishwasher
10 …… Motor section
11 ... Stator
16 …… Rotor
17 …… Magnetic material
18 …… Rotation axis
20 …… Pump part
21 …… Forward rotation pump room
22 …… Forward rotation impeller
23 …… Forward rotation blade
25 …… Forward rotation inlet
26 …… Fork for normal rotation
31 …… Pump chamber for reverse rotation
32 …… Reverse impeller
33 …… Reverse blade
34 …… Passing hole
35 …… Reverse water intake
36 …… Reverse outlet
40 …… Partition wall
41 …… Forward rotation pump chamber opening

Claims (11)

Including a motor unit and a pump unit having a discharge port and two water intake ports,
In the motor unit, a rotor is rotatably arranged on the inner periphery of the stator,
In the pump unit, an impeller having a forward rotation blade and a reverse rotation blade connected to a rotation shaft of the rotor is provided,
The pump part has a forward pump chamber and a reverse pump chamber partitioned by a partition wall,
The forward impeller is disposed in the forward pump chamber,
The reverse rotation impeller is disposed in the reverse rotation pump chamber,
The normal rotation pump chamber has a normal rotation water suction port on the rotation axis,
The reversing pump chamber has a reversing water inlet,
Further, the partition wall has a forward pump chamber opening for allowing fluid to flow into the forward pump chamber,
Further, the reversing impeller has a passage hole through which the fluid flows in communication with the forward rotation water suction port and the forward rotation pump chamber opening at the periphery of the rotating shaft,
During forward rotation of the impeller, fluid from the forward rotation suction port is sucked into the forward rotation pump chamber from the passage hole and the forward rotation pump chamber opening and sent to the discharge port,
A pump characterized in that when the impeller rotates in the reverse direction, the fluid from the reverse rotation water intake port is sucked into the reverse rotation pump chamber and sent to the discharge port. The forward pump chamber has a forward outlet;
The reversing pump chamber has a reversing outlet;
During forward rotation of the impeller, the fluid from the forward suction port is sucked into the forward pump chamber from the passage hole and sent to the forward discharge port,
2. The pump according to claim 1, wherein when the impeller is reversely rotated, fluid from the reverse rotation water intake port is sucked into the reverse rotation pump chamber and sent to the reverse rotation discharge port. In the pump part,
The forward pump chamber partitioned by the partition wall is disposed at the upper part, and the reverse pump chamber is disposed at the lower part,
The pump according to claim 1 or 2, wherein the reversing impeller is arranged in the reversing pump chamber. The pump according to any one of claims 1 to 3, wherein the forward discharge outlet is opened upward of the pump. A substantially cylindrical guide for guiding the fluid from the normal rotation water suction port to the forward rotation pump chamber opening is provided around the passage hole of the reverse rotation blade toward the opening of the normal rotation water suction port. The pump according to any one of claims 1 to 4. The pump according to any one of claims 1 to 5, wherein the partition wall has a stepped structure having steps on the periphery of the rotating shaft and on the outer periphery thereof. The pump according to any one of claims 1 to 6, wherein a filling portion for preventing air accumulation is provided in a space portion between the upper portion of the forward rotation blade and the forward rotation pump chamber. The pump according to claim 1, wherein the motor unit constitutes a brushless DC motor. The pump according to any one of claims 1 to 8, wherein the forward rotation blade is a Hugal type, and the reverse rotation blade is a Wesco type. The pump according to claim 9, wherein the forward rotation blade is a semi-open type. In a dishwasher with a built-in pump that supplies washing water to the washing tank and sends the washed wastewater to the drain,
A dishwasher, wherein the pump is the pump according to any one of claims 1 to 10.

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