JPS6114808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention simplifies the structure of a washing centrifugal pump and a drain centrifugal pump in a dishwasher, and uses a single motor as the driving source for both pumps, simplifying the structure and facilitating assembly work. The purpose is to prevent the noise generated by the operation of the circulation pump during drainage.

Dishwashers generally require a circulation pump and a drainage pump, but conventionally, the drainage pump has been provided independently of the circulation pump and has a dedicated motor. Therefore, two motors were required, and both pumps were each fixed to the underframe beam with a pump bracket. Therefore, the circulation (cleaning) pump and the drainage pump each had to be assembled from similar parts separately, and the piping work was also complicated. It is also possible to drive both pumps with one motor, but in this case,
As shown in Publication No. 50-45977, a switching clutch is provided on the drainage pump side, and during cleaning, the clutch cuts off the rotational drive of the motor to the drainage pump side, drives only the circulation pump, and drains the water. It is known that the rotational drive of the motor is sometimes transmitted to the drainage pump by switching the clutch. However, this configuration has a problem in that the motor also drives the circulation pump at the same time when draining water, and the circulation pump agitates the water and generates noise.

The present invention eliminates the drawbacks of the conventional example, and embodiments thereof will be described below with reference to the drawings.

In FIG. 1, 1 is an outer casing, 2 is an inner tank, 3 is a door, 4 is a tableware basket provided in the inner tank 2, 5 is an injection nozzle, 6 is a strainer device provided at the bottom of the inner tank 2, and 7 is a circulation pump, and 8 is a motor. The cleaning liquid ejected from the injection nozzle 5 passes through a strainer device 6, is sucked into a circulation pump 7, is pressurized again, and is supplied into the injection nozzle 5. Although not shown in FIG. 1, a drainage pump is provided in parallel with the circulation pump 7, and when the motor 8 is reversed, a hose 9 is connected to the drainage port at the bottom of the strainer device 6.
The cleaning liquid is sucked through the cleaning liquid, and is discharged from the discharge port to the outside of the machine through a drainage hose (not shown).

The appearance of the pump part is as shown in Figure 2.
A drainage pump 10 is installed in parallel with the circulation pump 7.
is provided. One embodiment of this pump section will be explained based on Figs. 3 and 4. Fig. 3 shows details of the circulation pump 7, in which a vortex chamber 13 is formed by two left and right casings 11, 12, and A runner 14 is arranged in the center of the casings 11 and 12, and has a runner shaft 16 coaxially arranged with a motor shaft 15 of the motor 8. A mechanical seal 18 is arranged between the runner shaft 16 and the central boss portion 17 of the casing 11 to prevent water leakage, and at the same time an alignment metal 19 is interposed so that the runner shaft 16 is located at the center of the casing 11. . The casing 12 is provided with an inlet 20 at a position corresponding to the runner 14 to guide the cleaning liquid and the runner 14. The tip of the motor shaft 15 has a connecting part 21 that connects the runner shaft 16 and a pulley 22 that drives the drainage pump 10.
2 is integrally formed. The motor shaft 15 side of the connecting portion 21 is fixed with a set screw 23, and the runner shaft 16 side is connected to the runner shaft 16 via a one-way transmission clutch 24 installed inside. Reference numeral 25 denotes a holding fitting for the one-way transmission clutch 24, which is fixed to the connecting portion 21 with screws. A belt 26 is wound around the pulley 22 and transmits rotation to the drainage pump 10. A retaining washer 27 is screwed to the end of the runner shaft 16 on the motor shaft 15 side. A thrust rim 28 and a metal 29 are inserted between the washer 27 and the side surface of the one-way transmission clutch 24 to ease thrust sliding. The one-way transmission clutch 24 mounted within the connecting portion 21 is provided so that when viewed from the motor shaft 15 side, the transmission is transmitted when the motor rotates to the right, and it rotates idly when the motor rotates to the left. That is, when the motor 8 rotates to the left, the runner 14 stops.

The internal structure of the drainage pump 10 is as shown in FIG.
1 and 12 at the same time. A runner 31 is provided inside, and this runner 31 has a runner shaft 3 fitted into the boss portion 32 of the casing 11.
Fixed to 3. The pulley 34 is loosely fitted on the runner shaft 33 and is connected via a one-way transmission clutch 35. An inlet 36 is provided in the casing 12 at a position corresponding to the runner 31 to guide the drainage liquid to the runner 31. 37 is a partition provided between the vortex chambers 13 and 30. Said one-way transmission clutch 35
has a directionality opposite to that of the one-way transmission clutch 24 installed in the circulation pump 7, and when the pump 7 is driven, rotation is not transmitted, and the motor 8 is reversed and the pump 7 is
The pump 10 is connected to drive the pump 10 when the pump 10 is stopped.

Various types of clutches can be used as the one-way transmission clutches 24 and 35, but in this embodiment, a roller clutch is used. In this case, the runner shafts 16 and 33 serve as the inner rings necessary for the roller clutch. A spring clutch can be used in place of such a roller clutch, but there are many problems where the clutch spring gets caught between the bosses on the driving side and the driven side. Therefore, it is important to manage the gap between the bosses, and adjustment is necessary. The work is complex and requires a large amount of man-hours. Furthermore, the number of parts is large, and as a result, the dimensional tolerances of each part accumulate, making it difficult to achieve a certain degree of accuracy. Therefore, it is desirable to employ a roller clutch as in the embodiment. According to this roller clutch, the inner ring can also be used as the runner shaft 16 by simply press-fitting it into the connecting portion 21 without requiring precision parts or assembly.

FIG. 5 shows another embodiment of a circulation pump, in which a runner shaft 1 is attached to the central boss portion of the casing 11.
Aligning ball bearing 3 so that 6 is positioned
8 was interposed. A stopper 39 is provided at the end of the ball bearing 38 on the side opposite to the runner so that the thrust load is received by the stopper 39. A feature of this embodiment is that reassembly work is easy. That is, when the set screw is loosened and the runner shaft is removed from the drive member, the runner shaft can be prevented from being drawn into the casing. This is convenient for replacing the drive belt 26. Note that other rotation transmitting bodies may be used in place of the belt 26.

As described above, according to the present invention, the circulation pump and the drainage pump are configured with a common pump casing, and the pair of casings 11 and 12 may be overlapped. Therefore, the number of assembly steps can be greatly rationalized. Further, both pumps can be switched by simply rotating one motor in the forward and reverse directions, and no external operating means is required. Furthermore, since the circulation pump stops during draining, it is possible to eliminate the drawbacks of conventional systems in which the rotation of the circulation runner stirs water and generates noise during draining. In addition, the motor shaft and runner shaft are separate, making it easy to replace the belt, resulting in a simple structure that improves assembly workability and greatly contributes to streamlining dishwashers.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of the pump section of the embodiment, Fig. 3 is a sectional view of the circulation pump, and Fig. 4 is the drainage pump. FIG. 5 is a sectional view of another embodiment of the circulation pump. 7... Circulation pump, 8... Motor, 10...
...Drainage pump, 11, 12...Casing,
14, 31...Runner, 15...Motor shaft, 1
6, 33...Runner shaft, 21...Connection part, 2
2, 34... Pulley, 24, 35... One-way transmission clutch, 26... Belt, 37... Bulkhead, 38
...Ball bearing, 39...Stopper.

Claims (1)

[Scope of Claims] 1. One pump for circulation and the other pump for drainage are arranged side by side, and the casings of both pumps are integrally formed, and the casings of the two pumps are connected to the runner shaft of either pump. A motor shaft of a reversible motor is arranged coaxially with the motor shaft, and the two shafts are connected by a connecting part,
A one-way transmission clutch is provided between the outside of the runner shaft and the inside of the connecting portion, the motor shaft and the runner shaft of the other pump are connected by a rotation transmitting body, and the runner shaft of the other pump and the A pump drive device for a dishwasher, comprising a one-way transmission clutch provided on the runner shaft of the one pump and a one-way transmission clutch having an opposite direction between the rotation transmission body and the rotation transmission body. 2. The runner shaft of the one pump is supported by a ball bearing fitted into the central boss portion of the pump casing, and a stopper is provided at the end of the ball bearing on the side opposite to the runner.
Dishwasher pump drive device as described in section. 3. The pump drive device for a dishwasher according to claim 1, wherein the one-way transmission clutch is constituted by a roller clutch, and the inner ring of the roller clutch is also used as the runner shaft.