JPS599173B2 - dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dishwasher, and the present invention simplifies the configuration of a washing centrifugal pump and a drainage centrifugal pump of the dishwasher, simplifies the piping connecting each pump, and simplifies the structure of the two pumps. The object of the present invention is to provide a pump that can selectively operate each pump independently using one common motor as a drive source.

Conventionally, small pumps with dedicated drive motors have been used for washing and draining pumps in dishwashers.

Therefore, two motors are required, one for washing and one for draining, and although the washing centrifugal pump and the drainage centrifugal pump each have the same various parts, they are each constructed separately. It is something that
Each pump bracket was separately fixed to the underframe beam.

Furthermore, the piping work was complicated because these two centrifugal pumps were piped with separate hoses.

As described above, dishwashers use centrifugal pumps each having an independent dedicated motor, making them expensive.

There was also a dishwasher with a washing pump and a drain pump stacked vertically in series, but this was designed to switch between washing and draining by reversing the motor in the forward and reverse directions. The Wesco pump is used, ■The impeller is horizontal, and the whirlpool chamber is horizontal, so air that has entered the whirlpool chamber along with water is difficult to escape, and the impeller often idles, resulting in residual water. As the amount increases, there is a drawback that the drainage performance is insufficient and the performance during rinsing is deteriorated.

This is because there was a risk that a large amount of cleaning liquid would remain and the remaining liquid would be mixed into the rinsing process, causing the dishes to be recontaminated with the rinsing water.

Furthermore, there was a model that used a magnet to switch between washing and draining operations using a single motor, but the timing of the magnet operation was not good, which led to operation accidents, and the suction force was insufficient and sometimes caused large vibrations. It was easy to use, and there were extremely many failures due to magnet operation.

Furthermore, if the cleaning process is switched to the draining process while the motor is still rotating in one direction, the cleaning liquid will continue to be ejected from the nozzle during the cleaning process, and the flow into the drain pump will be delayed, making it take a long time to drain the water. There will be more water left.

The present invention can eliminate all of these drawbacks, and embodiments thereof will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes the exterior of the dishwasher.A top plate 2 is provided on the upper surface of this exterior, and an interior 3 with a front opening is provided inside.A front cover 4 is provided in this opening. There is.

Inside the interior 3, tableware baskets 5 and 6 are disposed in two stages, upper and lower, and cleaning liquid can be sprayed from the bottom side of each tableware basket 5 and 6 by cleaning nozzles 7 and 8.

The spouted cleaning liquid is sprayed inside the interior 3, but the cleaning liquid is sprayed inside the interior 1 again.
It collects in a four part 13 provided at the bottom of the tank, is filtered by a filter 14 housed therein, and is sucked into the circulation pump 11 through a suction hose 12.

The cleaning liquid is pressurized by the circulation pump 11 and is again jetted out from the cleaning nozzles I and 8 described above.

10 is a motor that drives the circulation pump; this motor 10
is fixed to a frame 9 fixed to the bottom of the exterior 1 via vibration isolating rubber 15.

Reference numeral 16 indicates main body support legs provided at the lower part of the exterior.

Adjacent to the circulation pump 11 is a drainage pump (not shown) integrated with the circulation pump 11.

) is provided, and the bottom recess 1 of the interior 1 is provided during the drainage process.
3 Drain pipe 18 connected to 9 Suction hose 1
Drainage takes place through 9.

As shown in FIG. 3, inside the circulation pump 11, a vortex chamber 23 is formed by two left and right casings 21, 22, and these casings 21. In the center of 22 is an impeller (hereinafter referred to as runner).

) 24, and two hollow rotating shafts 26 and 27 are rotatably loosely fitted in a concentric series arrangement at the tip of the rotating shaft 25 of the motor 10.

One hollow rotating shaft 26 and the central boss portion 2 of the casing 21
A mechanical seal 29 is placed between the holes 8 and 8 to prevent water leakage.

A washing or rinsing liquid inlet 30 is provided at a position corresponding to the runner 24 in the casing 22 to guide the washing or rinsing liquid flowing from the suction hose 12 to the runner 24.

A motor pulley 31 for driving the drain pump 17 is inserted into the middle of the motor rotating shaft 25 .

The boss portion of this motor pulley 31 also serves as the other hollow rotating shaft 27 mentioned above.

32 is a drive belt, and this drive belt 32 is connected to a pulley 42 of a drainage pump, which will be described later.

The motor pulley 31 is connected to the metal 3 with respect to the motor rotation shaft 25.
3, and the power is transmitted from the rotary shaft 25 through a clutch boss 34 interposed between the two hollow rotary shafts 26 and 27 and a clutch boss 34 that fixes the post 34 to the rotary shaft 25. This is done via the pin 35 of.

That is, the clutch spring 36 is wound around the outer periphery of each of the clutch boss 34, the motor pulley boss portion (hollow rotating shaft) 2T, and the hollow rotating shaft 26.

The clutch spring 36 can selectively transmit an output to either of the two hollow rotating shafts 26 and 27 depending on the rotational direction of the motor rotating shaft 25.

In other words, when the clutch spring 360 is wound clockwise and the motor 10 is set to rotate clockwise during cleaning, the outer periphery of the clutch boss 34 will rotate in the axial direction of the clutch spring 36. During cleaning, the spring on the motor pulley boss 27 side that slides in sliding contact with the motor pulley boss section 27 loosens and power transmission to the drainage pump is cut off, while the spring 36 on the hollow rotating shaft 26 side tightens. is driven.

Conversely, when the motor 10 is rotated to the left during drainage, the clutch spring 36 tightens on the clutch boss 34 and motor pulley boss 27, rotates the motor pulley 31, rotates the belt 32 and pump pulley 42, and supplies power to the drainage pump. Communication takes place.

The hollow rotating shaft 26 has a metal 38 press-fitted into one end thereof, a ball bearing 37 press-fitted into the other end thereof, and is rotatably supported with respect to the motor rotating shaft 25.

The pole bearing 37 is fitted into a step provided at the tip of the motor rotating shaft 25 and is held and fixed by a stop ring 39.

Both ends of the hollow rotating shaft 26 are configured to have a slightly smaller diameter.
The clutch spring 36 is fitted and positioned on one outer diameter 40, and the runner holding fitting 41 and the runner 24 are fitted on the other side, and a runner mounting cap nut 43 is screwed into the threaded portion provided at the tip of the runner. 24 and a hollow rotating shaft 26 are fixed.

An O-ring 44 is interposed between the runner 24 and the cap nut 43 to prevent liquid from flowing into the gap between the runner 24 and the cap nut 43.

Next, the internal structure of the drain pump 17 will be explained.

The vortex chamber 45 of the pump is integrally formed by combining the two casings 21 and 22 that form the vortex chamber 23 of the circulation pump 11 described above.

A runner 46 is provided inside, and this runner 46 is connected to two metal parts 4 fitted into the casing boss part 47.
It is fixed to the tip of a runner shaft 49 which is rotatably supported using a bearing 8 as a bearing.

Further, the pump pulley 42 is fixed to the base end of the runner shaft 49 with a set screw.

An oil seal 50 is installed between the metal 48 and the runner 46.
is provided to prevent water in the vortex chamber 45 from leaking to the outside from the bearing.

An inlet 51 is formed in the casing 22 at a position corresponding to the runner 46, and the drainage liquid flows from the interior bottom recess 13 through the suction hose 19 to the runner 4.
It flows into the 6th side.

By overlapping the casings 21 and 22, the vortex chamber 23 of the circulation pump 11 and the drainage pump 17 are separated as described above.
A vortex chamber 45 is formed integrally with both vortex chambers 23, 45.
A separation wall 52 is simultaneously formed between them.

Also, as shown in Fig. 2, both swirl chambers 23, 450 runners 24,
The height of the center of 46 is slightly lower on the drain pump 17 side (in the figure, it is lowered by H).

) so that the remaining water in the circulation pump 11 flows into the drainage pump 17 side.

In this embodiment, the circulation pump vortex chamber 2 of the casing 22
A drain groove 53 is provided at the lowest part of the drain groove 53, which allows the vortex chambers 23 and 45 of each pump 11 and 17 to communicate with each other, and the drain pump pressurizes and discharges the water to reduce residual water. can.

In this case, the vortex chamber 45 of the drainage pump 17 is
must be configured so that they are at the same position or at a slightly lower position.

The above-described embodiment device is as follows: i) The circulation pump 11 and the drainage pump 17 are composed of an integrated pump casing, and each pump has two pump casings 21 and 22.
Since it is completed by overlapping the parts, assembly can be significantly streamlined.

11) There is no need to attach the drainage pump 17 to a beam such as an underframe as in the past, and only the circulation pump 11 can be attached.

111) Switching between both pumps is completed by simply reversing one motor 10 in the forward and reverse directions via the clutch spring 36, and there is no need for any external operation, similar to the one described at the beginning that uses magnets for switching. Since no extra parts are required, there is no need to worry about breakdowns.

iV) When the cleaning pump is operating, clutch boss 34
Since the clutch spring 36 wound around the belt loosens and the motor pulley 31 comes to a complete stop, the belt 32 also stops accordingly, greatly increasing the durability of the belt 32.

(2) Also, during drainage, the rotation of the runner 24 of the circulation pump 11 stops, and the water in the vortex chamber 23 of the circulation pump 11 is no longer stirred. Since the stirring noise is suppressed, the operation becomes extremely quiet.

Vj) Since the vortex chamber 45 of the drainage pump 17 is located at a position not higher than that of the circulation pump 11, the residual water in the circulation pump vortex chamber 23 smoothly flows to the drainage pump through the groove 53, and the amount of residual water is extremely reduced.

As described above, the dishwasher according to the present invention can selectively drive the circulation pump that circulates the cleaning liquid and rinsing liquid and the drain pump that discharges these liquids to the outside of the machine using a single motor. One drive is performed by switching between forward and reverse rotation of the motor using a switching clutch, which not only greatly simplifies the configuration but also facilitates assembly.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway overall configuration diagram of the dishwasher, Fig. 2 is an external perspective view showing an integral structure of the circulation pump 1 and the drain pump 1T, Fig. 3 is a detailed cross-sectional view of the circulation pump 11, and Fig. 4 is 3 is a detailed cross-sectional view of the drainage pump 17. FIG. DESCRIPTION OF SYMBOLS 10... Drive motor of circulation pump 11, 11... Circulation pump, 17... Drainage pump, 21... Casing, 22... Casing, 23... Vortex chamber, 24...
- Runner (impeller), 25... Rotating shaft of motor 10, 26... Hollow rotating shaft, 2T... Hollow rotating shaft, 31
...Motor pulley, 32...Drive belt, 34...
・Clutch boss, 36...Clutch spring, 42
...Drain pump size 45...vortex chamber, 46...
Runner, 52... bulkhead, 53... drain groove.

Claims (1)

[Claims] 1. A circulation pump that circulates washing liquid and rinsing liquid in a dishwasher, a drain pump that discharges these liquids to the outside of the machine, and a single motor that selectively drives these two pumps. two independent hollow rotating shafts are loosely fitted concentrically in series to the rotating shaft of the motor, and between these two hollow rotating shafts and the rotating shaft of the motor, A dishwasher characterized by interposing a switching clutch that selectively interlocks the output of the two hollow rotating shafts by reverse rotation. 2. Claims characterized in that the vortex chamber that accommodates the impeller of the circulation pump and the vortex chamber that accommodates the impeller of the drainage pump are configured by a common casing, and the vortex chambers are partitioned by a partition wall. The dishwasher according to paragraph 1. 3. A passage is provided that communicates the bottom of the vortex chamber of the circulation pump with the bottom of the vortex chamber of the drainage pump, and the vortex chamber of the cleaning vortex pump is provided at a position not lower than that of the vortex chamber of the drainage pump. A dishwasher according to claim 1 or 2.