JPS5852655B2 - dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A conventional drain pump for a dishwasher has a dedicated small drain pump (equipped with a motor).

Therefore, two motors are required, one for cleaning and one for draining, and both pumps are separate pumps and are fixed to the underframe beam with individual pump brackets.

Also, for the cleaning pump and drainage pump, similar parts must be assembled separately to complete two centrifugal pumps, and the two completed centrifugal pumps are piped with separate hoses. This made the piping work complicated.

As described above, since each of the pumps is an independent centrifugal pump, the cost is also high.

There was also a dishwasher that had a washing pump and a drain pump stacked vertically in series, but this switched between washing and draining by rotating the motor in the forward and reverse directions, and these pumps used a Wesco pump. In addition, since the runner is placed horizontally in the vortex chamber, it is difficult for air that has entered the vortex chamber to escape together with the water, resulting in more idling of the impeller, and as a result, the remaining water after draining is reduced. The problem was that there were too many.

In addition, since a large amount of cleaning liquid remains, this cleaning liquid mixes with the dishes during the rinsing process and recontaminates the dishes.

There was also a model that used a magnet to switch between washing and draining operations using a single motor, but this could lead to accidents due to the timing of the magnet operation being incorrect, and the suction power was insufficient. This tends to cause large vibrations, and therefore failures due to magnet operation are extremely common.

Furthermore, if you switch to draining while the motor is still rotating in one direction, i.e. while jetting from the nozzle, there is a disadvantage that the flow into the drain pump will be delayed and draining will take a long time, and a large amount of residual water will remain. had.

The present invention has been made to solve the above-mentioned conventional problems, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a main body of the dishwasher.A top plate 2 is placed on the top surface of the main body 1, and an inner tank 3 with a front opening is provided inside.The front opening of the inner tank 3 has a front lid 4. has been set up.

The inner tank 3 with the front lid 4 opened has two upper and lower tableware hems 5 and 6, and cleaning liquid is sprayed from the cleaning nozzles γ and 8 from the bottom of each heel 5.6. It looks like this.

The sprayed cleaning liquid is then sprayed into the inner tank 3, but it collects again in the recess 13 on the bottom, is filtered by the filter 14 housed therein, and passes through the suction hose 12 to the cleaning pump. It gets sucked into 11.

Further, the cleaning liquid is pressurized by the cleaning pump 11 and is again jetted out from the cleaning nozzles 7 and 8 described above.

Reference numeral 10 denotes a motor that drives a cleaning pump 11, and this motor 10 is mounted on a frame 9 fixed to the bottom of the main body 1 with a vibration-proof rubber 15.
It is fixed through.

Reference numeral 16 is a main body support leg provided at the bottom of the main body 1.

Also, adjacent to the cleaning pump 11 is a drainage pump 1γ.
is provided, and during the drainage process, it is sucked into the drainage pump 11 through the suction hose 19 from the drainage pipe 18 provided in the bottom recess 13 of the inner tank 3, and then the drainage hose (not shown) is passed through the discharge port 20. and is ejected from the aircraft.

The interior of the cleaning pump 11 is as shown in FIG. 3, with two left and right pump casings 21 and 22 forming a vortex chamber 23, and a runner 24 arranged in the center of the pump casings 21 and 22. However, it is rotatably fixed to the tip of the shaft 25 of the motor 10 described above.

Further, a mechanical seal 2γ is provided between the motor shaft 25 and the central boss portion 26 of the casing 21 to prevent water leakage.

The casing 22 also has an inlet 28 at a position corresponding to the runner 24 to guide the cleaning liquid flowing in from the suction hose 12 to the runner 24.

Further, a motor pulley 29 for driving the drainage pump 1γ is loosely fitted in the middle part of the motor shaft 25,
It is also connected to a pulley 31 of the drainage pump 17 via a drive belt 30.

The motor pulley 29 is attached to the metal 32 with respect to the motor shaft 25.
The clutch boss 34 is fixed to the motor shaft 25 with a pin 33 and the boss part 35 of the motor pulley 29 is fitted onto the outside of each of the clutch boss 34 and the boss part 35 of the motor pulley 29. This is done by the clutch spring 36.

This clutch spring 36 is configured to switch between drive transmission and drive stop depending on the rotational direction of the motor shaft 25.

That is, when the rotation of the motor 10 during cleaning is set to clockwise, the winding direction of the clutch spring 36 is clockwise, and the spring 36 is loosened during cleaning, so that the power to the drain pump 17 is reduced. The transmission is cut off and the drain pump 17 is stopped.

Conversely, when draining water, the motor 10 rotates to the left, the clutch spring 36 wraps around the clutch boss 34 and the boss 35 of the motor pulley 29, and the motor pulley 2
9, and belt 30 and drainage pump 17.
Boo IJ-31 is also rotated to rotationally drive the drainage pump 17.

Next, the internal structure of the drainage pump 17 will be explained.
The vortex chamber 37 of this drainage pump is also formed by combining two pump casings 21 and 22, as shown in FIG.

A runner 38 is provided inside the vortex chamber 3γ, and this runner S8 is fixed to the tip of the runner shaft 41.

The runner shaft 41 is rotatably supported by two metal pieces 40 fitted into the casing boss 39 as bearings.

The pump pulley 31 is fixed to the runner shaft 41 with a set screw 31'.

An oil seal 4 is provided between the medal 40 and the runner 38.
2 is arranged to prevent water in the vortex chamber 3γ from leaking to the outside from the bearing portion.

Further, the casing 22 has an inlet 43 at a position corresponding to the runner 38, and this inlet 43 guides the drainage liquid flowing from the bottom recess 13 of the inner tank 3 through the suction hose 19 to the runner 38. be.

By overlapping the pump casings 21 and 22 as described above, the vortex chamber 23 of the cleaning pump 11 and
A vortex chamber 37 of the drainage pump 1γ is formed, and a partition wall 43 for separation is provided between the two vortex chambers 23, 37 to form an integral structure.

Also, the height of the centers of the runners 24.38 of both swirl chambers 23.37 is set so that the drain pump 17 side is lower by H as shown in FIG. Care is taken so that the water flows into the drainage pump 17 side.

For example, as shown in FIG. 2, a drain pipe 44 is made to protrude from the lowest part of the cleaning pump vortex chamber 23 of the casing 22,
This pipe 44 is connected to the drainage suction hose 19 through a drain hose 45 to reduce residual water.

In this case, the bottom of the vortex chamber 23 and the inlet 4 of the drain pump 17
3 must be configured so that the inlet 43 is at the same position or at a slightly lower position.

With this configuration, the remaining water in the whirlpool chamber 23 in the washing pump 11 can also flow quickly into the draining pump 17, so that the remaining water can be used to recycle dishes during the rinsing process as in the conventional method. Contamination can also be prevented.

As is clear from the above embodiments, according to the present invention, a cleaning pump that circulates cleaning liquid and rinsing liquid and a drainage pump that discharges cleaning liquid and rinsing liquid to the outside of the machine are integrally constructed with two pump casings. As a result, the assembly work has been greatly streamlined compared to the conventional method of assembling each pump individually, and when incorporating it into the aircraft, it is no longer necessary to use a dedicated drainage pump as in the past. There is no need to attach it to the underframe beam, etc., and production can be streamlined.

In addition, the operation of the drainage pump can be switched by simply rotating one motor in the forward and reverse directions, so there is no need to operate it from outside. Since these items are not required at all, there is no need to worry about malfunctions.

Also, during drainage, the runner of the cleaning pump is rotating, but since the spiral direction of the cleaning pump's vortex chamber is reversed, the discharge pressure that occurs during cleaning is not generated, which has a negative effect on the drainage work by the drainage pump. It is also possible to prevent this from occurring.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a dishwasher showing an embodiment of the present invention;
FIG. 2 is a sectional view of the pump in the same dishwasher, FIG. 3 is a sectional view of the washing pump, and FIG. 4 is a sectional view of the drain pump. 11... Washing pump, 10... Motor, 17... Drainage pump, 21, 22...
... Pump casing, 23.37 ... Vortex chamber, 24.38 ... Runner 25,41 ...
...Runner axis, 43...Bulkhead.

Claims (1)

[Scope of Claims] 1. A cleaning pump that circulates cleaning liquid and rinsing liquid, and a drainage pump that discharges the cleaning liquid and rinsing liquid to the outside of the machine, and both pumps are integrally constructed with a two-plate pump casing. Furthermore, both pumps are driven by one motor, each having an independent vortex chamber, runner, and runner shaft, and the operation of the drainage pump can be stopped via a one-way transmission clutch by forward and reverse rotation of the motor. A dishwasher characterized by switching. 2. The vortex chamber of the cleaning pump and the vortex chamber of the drainage pump are placed close to each other and separated by a single partition, and the vortex chamber of the drainage pump is arranged below the vortex chamber of the cleaning pump. A dishwasher according to claim 1.