JP4278947B2 - Pump and cleaning device and dishwasher using the pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump and a washing apparatus, and more particularly to a pump that achieves a reduction in size, thickness, weight, and cost, and a washing apparatus and dishwasher having a compact structure using the pump.
[0002]
[Prior art]
In devices using pumps such as household appliances such as dishwashers and washing machines, there are high market needs such as downsizing, downsizing, price reduction, and operability improvement as well as higher performance. In response to such demands, the pump used in the apparatus is also small and lightweight. In particular, a thin high-performance pump is desired from the viewpoint of saving space in the apparatus, assembling, or reducing the overall height of the product. In addition, a low price is required.
[0003]
The conventional pump has a thrust washer provided at a location facing the end face of the metal bearing that supports the impeller, and a resin casing in which the impeller is housed and a water channel is formed ( For example, see Patent Document 1.)
[0004]
An example of a canned pump used in a conventional dishwasher or the like will be described based on a longitudinal sectional view of the pump 100 shown in FIG.
[0005]
The pump 100 includes a stator 110 and a pump chamber 120 disposed on the inner peripheral side of the stator 110. In the pump chamber 120, an upper casing 141 made of resin and a lower casing 142 are formed with a rubber seal 143 interposed therebetween, and a suction pipe 146 having a fluid suction port 121 made of the upper casing 141 is formed in the upper portion of the pump chamber 120, and a side portion. discharge pipe 145 is provided, et al is also a flow path 125 extending from the pump chamber 120 to the discharge port 122 is formed with a discharge port 122 in.
[0006]
The stator 110 includes an iron core 111 arranged in a ring shape and a coil 112 wound around the stator. A driving circuit board 113 for driving the motor is arranged. The entire stator portion is molded by a mold resin 114. Molded.
[0007]
In the pump chamber 120, a rotor 123 having a magnetic body 124 arranged along the inner periphery of the stator 110 is rotatably arranged to constitute a brushless DC motor, and the rotor 123 performs fluid suction and discharge operations. An impeller 127 is generated, and the rotor 123 simultaneously constitutes the impeller.
[0008]
The fixed shaft 130 is fixed with its lower end embedded in the lower casing 142 and is erected at the center of the pump chamber 120, and the rotor 123 is fixed up and down via a bearing metal 133 having thrust washers 131 and 132. The shaft 130 is rotatably supported.
[0009]
In the pump 100 having the above configuration, the rotor 123 in the pump chamber 120 rotates by energizing the stator 110 and sucks fluid from the suction port 121, and the fluid is pumped into the pump chamber 120 by the centrifugal action generated by the impeller 127. Then, a swirling flow is generated in the flow path 125 and discharged from the discharge port 122 of the discharge pipe 145.
[0010]
The pump 100 has a structure in which the rotor 123 and the impeller 127 are integrated, the pump chamber 120 is disposed on the inner periphery of the stator 110, the suction port 121 is provided at the upper portion of the pump chamber 120, and the discharge port 122 is provided at the side portion. improvements such as shortening the passage Te is made, the pump of small, but those which attained thinning, yet the pumps small, was not to been fully satisfy the demand for thinning.
[0011]
In the pump 100, the rotor 123 rotates as a submerged bearing by sliding the bearing metal 133 and the upper and lower thrust washers 131, 132, but the fixed shaft 130 is embedded in the lower casing 142 made of a resin material. Therefore, the lower thrust washer 132 made of stainless steel, alumina ceramic, or the like cannot be omitted, and the cost is high.
[0012]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-343988 (page 2-3, FIG. 1)
[0013]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is a pump suitable for being built in and used in a dishwasher, a washing machine or the like, and a thin pump that realizes a reduction in size and weight of the pump and that can reduce costs, and a pump thereof. It is to provide a washing apparatus and a dishwasher used.
[0014]
[Means for Solving the Problems]
According to the first aspect of the present invention, a pump chamber is provided on the inner peripheral side of the ring-shaped stator, and the pump chamber has a fluid suction port that opens upward, a discharge port, and a flow path thereof. The pump chamber has a fixed shaft standing at the center of the bottom plate of the pump chamber, and in the pump chamber, a rotor having a magnetic body and an impeller arranged along the inner periphery of the stator has the fixed shaft. A pump that is rotatably supported by the impeller, sucks fluid from the suction port into the pump chamber by the rotation of the impeller, and discharges the fluid from the discharge port to the outside. The pump chamber includes a resin casing. A pump comprising a metal bottom plate, wherein the fixed shaft is fixed to the bottom plate at a lower end thereof.
[0015]
According to the pump of the present invention, the resin casing that forms the bottom of the pump chamber is made of a metal bottom plate, so that the casing strength can be obtained and the thickness of the bottom of the pump chamber can be reduced. Figured. Further, slidability is obtained between the metal bottom plate and the bearing metal, and the lower thrust washer can be omitted.
[0016]
The invention according to claim 2 is the pump according to claim 1, wherein the metal bottom plate is a stainless steel plate.
[0017]
According to the pump of the present invention, since the stainless steel bottom plate is excellent in strength and corrosion resistance, it is possible to obtain a pump with excellent durability by reducing the thickness of the bottom plate, and it is possible to obtain a slidability with a bearing metal and a washer. It can be omitted.
[0018]
The invention of claim 3 has a washing tank for storing contaminants, a washing tank supplied to the washing tank or a washing tank for storing the washed dirty water, and supplying the washing water from the water tank to the washing tank. 3. A cleaning apparatus including a pump for cleaning the contaminants and draining the cleaned sewage from the water tank, wherein the pump is the pump according to claim 1 or 2. It is.
[0019]
According to the cleaning apparatus of the present invention, by reducing the flatness of the built-in pump, it is possible to save space in the apparatus and improve the incorporation, and to reduce the size and size of the apparatus, particularly the overall height. Alternatively, the storage space in the apparatus can be expanded to be a large storage type, so that the operability is improved and the cost can be reduced.
[0020]
According to a fourth aspect of the present invention, the water tank of the cleaning device has a connection pipe that opens downward, and the inner diameter side of the suction port of the pump and the outer diameter side of the connection pipe of the water tank are fitted and connected. The cleaning apparatus according to claim 3, wherein
[0021]
According to the cleaning apparatus of the present invention, the connection distance between the pump and the apparatus main body can be shortened, and the apparatus can be made more compact and smaller.
[0022]
A fifth aspect of the present invention is the cleaning apparatus according to the third or fourth aspect, wherein the cleaning apparatus is a dishwasher.
[0023]
According to the washing apparatus of the present invention, it is possible to provide a dishwasher that is small in size, low in overall height, and has a wide storage space for dishes, and is easy to use.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0025]
(First embodiment)
FIG. 1 is a longitudinal sectional view of a pump 1 according to the first embodiment.
[0026]
In the pump 1, a pump chamber 20 is provided on the inner peripheral side of the ring-shaped stator 10.
[0027]
The stator 10 includes an iron core 11 arranged in a ring shape and a coil 12 wound around the core. A drive circuit board 13 for driving a motor is arranged along the stator 10. The whole is molded with the mold resin 14 to improve the water resistance and insulation of the electrical component.
[0028]
The pump chamber 20 includes a resin casing 41 and a stainless steel bottom plate 42, and is formed by fastening a waterproof rubber seal 43 therebetween.
[0029]
The pump chamber 20 has a suction pipe 46 provided on the upper part of the pump chamber 20 formed by the casing 41 and has a fluid suction port 21 that opens upward, and a discharge pipe 45 provided on the side thereof. A discharge port 22 is opened, and a flow path 25 is formed through which fluid flows from the pump chamber 20 toward the discharge port 22.
[0030]
The fixed shaft 30 is erected at the center of the pump chamber 20 by inserting and fixing the projecting connection portion 34 at the lower end of the fixed shaft 30 into the connection hole 47 of the recessed portion 44 provided in the center of the bottom plate 42. The rubber ring 35 and the cover 36 prevent water leakage from the pump chamber 20.
[0031]
In the rotor 23, an impeller 27 is provided on a rotor base portion 26, and a magnetic body 24 disposed along the inner periphery of the stator 10 is connected to the impeller 27.
[0032]
The rotor 23 is rotatably supported on the fixed shaft 30 via a bearing metal 33 provided with a thrust washer 31 on the upper part thereof, and constitutes a brushless DC motor together with the stator 10.
[0033]
The rotor 23 is obtained by welding a magnetic body 24 formed of a plastic magnet and an impeller 27 to the rotor base 26 at the impeller 27 portion. Alternatively, the magnetic base 24 may be welded to the integrally formed rotor base 26 and impeller 27.
[0034]
In the pump 1 configured as described above, the rotor 23 in the pump chamber 20 is rotated by energization of the stator 10, fluid is sucked into the pump chamber 20 from the suction port 21, and the fluid is caused by centrifugal action generated by the impeller 27. A swirling flow is generated in the pump chamber 20, flows through the flow path 25, and is discharged out of the pump 1 from the discharge port 22 at the tip of the discharge pipe 45.
[0035]
The pump 1 employs a bottom plate 42 made of a stainless steel plate instead of the conventional resin lower casing made of nylon resin or the like that forms the pump casing. Even if the thickness is made thinner than before, the thickness can be reduced because it can withstand the internal pressure of the pump chamber 20, and the pump size corresponding to the reduced thickness can be shortened, making the pump smaller, thinner and lighter. It becomes.
[0036]
As the bottom plate 42, various metal materials such as a rolled steel plate and an aluminum alloy such as duralumin can be used in addition to the stainless steel plate.
[0037]
Further, by using a metal plate such as the stainless steel plate as the bottom plate 42, the slidability between the metal plate and the bearing metal 33 can be obtained, and the conventional lower thrust washer can be omitted. The washer consisting of
[0038]
In particular, if a stainless steel plate is used for the bottom plate 42, it is superior in strength and corrosion resistance to other metal materials such as an aluminum alloy, and slidability with the bearing metal is surely obtained, thereby improving the durability of the pump. Therefore, it is preferable because it can realize small size, thinning and cost reduction.
[0039]
Accordingly, the dishwasher and the washing machine using the pump 1 are small and light, especially the height of the product can be reduced, and the storage space for the tableware and the like inside the apparatus can be widened. It becomes possible to obtain an easy-to-use product with excellent operability.
[0040]
(Second Embodiment)
FIG. 2 is a dishwasher 2 incorporating the pump 1 according to the second embodiment, and is a schematic longitudinal sectional view showing a connection portion between the pump 1 and a water tank 50 in the dishwasher. FIG. 3 is a dishwasher 3 of a comparative example that incorporates the pump 1, and is a schematic longitudinal sectional view showing a connection portion between the pump 1 and the water tank 50.
[0041]
The dishwashers 2 and 3 are provided with a washing tank (not shown) for storing dishes and a water tank 50 for storing washing water 61 supplied to the washing tank or sewage 62 after washing, below the washing tank. As a pump for sucking wash water 61 for washing the water from the water tank 50 and pumping it to the wash tank to wash the dishes, and discharging the washed sewage 62 collected in the water tank 50 to the outside of the machine A dishwasher incorporating the pump 1.
[0042]
In the dishwashers 2 and 3, the suction port 21 of the pump 1 and the connection port 53 or 55 provided at the bottom of the water tank 50 are fitted and connected. Further, in the water tank 50, a net for collecting garbage such as leftovers is provided above the suction port 21 of the pump 1.
[0043]
Further, the discharge port 22 of the pump 1 is connected to a water supply pipe having an injection nozzle for sending the cleaning water 61 to the cleaning tank and a drain pipe for draining the sewage to the outside of the machine (all are shown in the figure). Not shown). The structure and driving method of the dishwashers 2 and 3 have a general structure and driving method of a dishwasher, and the description thereof is omitted.
[0044]
In the dishwasher 2 of the embodiment, as shown in FIG. 2, the water tank 50 has a connection port 53 provided at the bottom and opening downward, and has an outer diameter side of the connection port 53 and the suction pipe of the pump 1. The inner diameter side of 46 is fitted and connected with a waterproof rubber ring 57 interposed therebetween.
[0045]
As a result, the bottom surface portion 54 of the connection pipe 52 of the water tank 50 is connected to the top surface portion 15 of the mold resin 14 molding the stator 10 of the pump 1.
[0046]
On the other hand, in the dishwasher 3 of the comparative example, the conventional general connection method between the pump and the water tank is adopted. As shown in FIG. 3, the water tank 50 has a connection port that opens downwardly on the connection pipe 52 provided at the bottom. 55, the inner diameter side of the connection port 55 and the outer diameter side of the suction pipe 46 of the pump 1 are fitted with the waterproof rubber ring 57 interposed therebetween, and both are connected.
[0047]
In this case, a gap D is generated between the bottom surface portion 56 of the connecting pipe 52 of the water tank 50 and the upper surface portion 16 of the mold resin 14 molding the stator 10 of the pump 1. Increases the overall dimensions of the device.
[0048]
Accordingly, in the dishwasher 2, the connection distance between the pump 1 and the water tank 50 can be made shorter than the dishwasher 3, and the dimensions of the dishwasher, particularly the height of the apparatus, can be reduced by the gap D. Designed to be low and compact.
[0049]
Further, since the dishwasher 2 is connected with the pump 1 and the bottom surface portion 54 of the water tank 50 in contact with each other, a stable connection portion can be obtained without generating the gap D as in the dishwasher 3, and vibration and noise can be obtained. It is also possible to suppress the occurrence of.
[0050]
As described above, according to the present invention, in addition to the use of the pump 1 that has been reduced in size and thickness, by improving the method of incorporating the pump into the dishwasher, the apparatus can be made more compact and smaller. Furthermore, the cost can be reduced.
[0051]
In the above embodiment, the present invention has been described by exemplifying a dishwasher, but the pump of the present invention is a washing device using water such as a washing machine, a water heater, an electric pot, a bath water circulation device, various fluid circulations, Needless to say, it can be used in a supply device and can contribute to reduction in size, weight and cost.
[0052]
【The invention's effect】
As described above, according to the pump of the present invention, a pump that is small and thin and has excellent durability can be obtained at low cost.
[0053]
And the washing device and dishwasher using this pump are compact and downsized, especially the overall height of the device can be suppressed, and the storage space in the device can be widened, and it has excellent operability. It is possible to provide cost-effective products that are easy to use.
[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 longitudinal sectional view of a pump connection part of the dishwasher according to the second embodiment.
FIG. 3 is a schematic longitudinal sectional view of a pump connection portion of a dishwasher according to a comparative example.
FIG. 4 is a longitudinal sectional view of a conventional pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pump 2 ... Dishwasher 10 ... Stator 20 ... Pump chamber 21 ... Inlet 23 ... Rotor 24 ... Magnetic body 25 ... Flow path 27 ... Impeller 30 ... Fixed shaft 31 …… Thrust washer 33 …… Bearing metal 41 …… Case 42 …… Bottom plate 46 …… Suction pipe 50 …… Water tank 52 …… Connection pipe 53 …… Connection port

Claims (5)

A pump chamber is provided on the inner peripheral side of the ring-shaped stator,
The pump chamber has a fluid suction port that opens upward, a discharge port, and a flow path thereof.
In addition, it has a fixed shaft erected in the center of the bottom plate of the pump chamber,
In the pump chamber, a rotor having a magnetic body and an impeller disposed along the inner periphery of the stator is rotatably supported by the fixed shaft to constitute a motor,
In the pump that sucks fluid from the suction port into the pump chamber by the rotation of the impeller and discharges the fluid from the discharge port to the outside.
The pump chamber consists of a resin casing and a metal bottom plate,
The said fixed shaft is being fixed to the said baseplate by the lower end part. The pump characterized by the above-mentioned. The pump according to claim 1, wherein the metal bottom plate is a stainless steel plate. A washing tank for storing contaminants, a washing tank supplied to the washing tank or a washing tank for storing the washed dirty water,
In the cleaning apparatus incorporating the pump for supplying the cleaning water from the water tank to the cleaning tank to clean the contaminants, and draining the cleaned dirty water from the water tank,
The said pump is a pump of Claim 1 or 2. The washing | cleaning apparatus characterized by the above-mentioned. The water tank of the cleaning device has a connecting pipe that opens downward;
The cleaning apparatus according to claim 3, wherein an inner diameter side of the suction port of the pump and an outer diameter side of a connection pipe of the water tank are fitted and connected. The washing apparatus according to claim 3 or 4 , wherein the washing apparatus is a dishwasher.