JPH0765598B2 - Water supply / drainage pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water supply / drainage pump, such as a dishwasher, which normally rotates an impeller to supply cleaning water and reversely discharges the cleaning water.

(B) Conventional Technology An example of this type of water supply / drainage pump is disclosed in Japanese Utility Model Publication No. 50-15164. This product forms an annular flow path between the outer circumference of the impeller and the inner circumference of the casing, and provides a water inlet and a water outlet in the tangential direction during forward rotation and reverse rotation. A partition wall is specially projected between the mouth and the mouth. When the impeller rotates, a negative pressure is applied to one of the ports to prevent backflow.

As described above, the conventional example is configured to supply or drain water without switching the valves at the water supply port and the water discharge port during normal rotation and reverse rotation.

(C) Problems to be Solved by the Invention However, in the conventional example, the transmitted water causes turbulent flow near the partition wall as it tries to invade the annular flow path, and the partition wall narrows each port. The flow rate cannot be secured unless the size of is increased.

Further, since the pressure rises at the water supply port or the drainage port and the pressure inside the casing also rises, the negative pressure cannot be sufficiently applied at the other port, and there is a possibility that the switching performance will not be sufficient.

INDUSTRIAL APPLICABILITY The present invention improves the switching performance between the water supply port and the drainage port and ensures the flow rate in each work.

(D) Means for Solving the Problem The solution means according to the present invention is a centrifugal type impeller in which blades are erected radially on a substrate and selectively forward and reverse, and the impeller is housed and opposed in the axial direction. And a casing provided with a water supply port in a substantially tangential direction at the time of normal rotation, the outer edge of the impeller is inclined outward from the substrate, and the inner peripheral surface of the casing near the substrate. A projecting wall facing in the reverse direction is provided, and a drain port is provided in the projecting wall in a substantially tangential direction at the time of reverse direction.

(E) Action The slanted outer edge of the blade reduces the water supply pressure to the water supply port or drainage port. This pressure drop changes along the slope,
The lowest is near the substrate. Therefore, at the time of normal rotation (water supply work) near the drain port, negative pressure or a weak positive pressure that does not drain from the drain hose is used, and the water supply pressure is partially low, and it is almost never sent to the drain port. .

(F) Example An example in which the dish washer is incorporated into the dish washing machine will be described with reference to the drawings. A washing tank 2 is provided in the machine body 1 of the dish washing machine, and a front opening of the washing tank 2 is a front opening type door 3. Opens and closes. The tableware basket 4 is put in and taken out from this front opening, and the tableware is washed with the washing water sprayed from the arm nozzle 5 at the lower part of the washing tank 2.

The cleaning water is supplied through a water supply valve (not shown) and heated by the heater 6 if necessary.

The cleaning / drainage pump 7 is for rotating the impeller 8 in the normal direction for cleaning and reversing it so as to perform the drainage. The impeller 8 is rotated by a horizontal axis, and the circumference of the impeller 8 is formed into a horizontally cylindrical casing 9 Surrounded by.
The casing 9 has an upward water supply port 10 projecting on one side of the upper part, a lateral drainage port 11 projecting on the other side of the lower part at the lowest position, and a suction port 12 at a position facing the axis of the impeller 8. It is provided.

The upward water supply port 10 communicates with the arm nozzle 5. The horizontal drainage port 11 communicates with a drainage hose (drainage passage) 13 bent at a predetermined height. Suction port 12 is cleaning tank 2
The filter 14 communicates with the storage recess 14 and the circulation port 15.

Here, the impeller 8 and the casing 9 will be described. First, the impeller 8 is composed of a small-diameter substrate 16, a horizontal shaft 17, a plurality of blades 18, ..., And a large-diameter ring 19. A horizontal axis 17 is erected at the center of the substrate 16, and blades 18 that are connected to the substrate 16 and the horizontal axis 17 are radially provided, and a tip end portion of the blade 18 is a ring.
Connected at 19. A skirt-shaped enlarged diameter portion 20 is formed in the vicinity of the substrate 16 on the horizontal axis 17. Also, the outer edge 21 of the blade 18 ...
Are linearly inclined from the small-diameter substrate 16 to the large-diameter ring 19. That is, the water supply pressure is set to be small near the substrate 16.

On the other hand, the casing 9 has a projecting wall 22 facing the center of the casing formed on the inner peripheral surface on the other side of the lower portion where the horizontal drainage port 11 is provided. Then, the protruding surface of the protruding wall 22 is attached to the blade 18
It is slanted linearly so as to face the outer edges 21 of the above with a constant gap (about 1 mm). The drainage port 11 is provided near the substrate 16 of the protruding wall 22 and in a substantially tangential direction when the impeller 8 is reversed. The upward water supply port 10 on one side of the upper portion is located in a substantially tangential direction when the impeller 8 rotates in the normal direction.

The rotation center of the impeller 8 is deviated from the center of the casing 9.

Thus, at the time of water supply, water leakage is prevented by bending the drain hose 13, and here the pump 7 impeller 8
When the water is normally rotated, the cleaning water sucked from the circulation port 15 is supplied to the arm nozzle 5 in the order of the suction port 12, the blades 18 ... And the water supply port 10, is sprayed, and is used for cleaning.

In the normal casing 9, the water supply pressure is applied to various places due to the resistance of the water supply channel, and a positive pressure may be applied to the drainage port 11 which should not generate a negative pressure due to the ejector effect. That is,
May be drained. However, in this embodiment, the ejector effect is exerted on the entire area of the protruding wall 22, and especially the blade 18 ...
The water supply pressure in the vicinity of the substrate 16 was reduced, and a portion where a negative pressure was generated on the protruding wall 22 close to this or a weak positive pressure was generated to the extent that the bent drainage hose 13 did not drain it. Further, since the drainage port 11 is provided at this location, there is almost no drainage during normal rotation.

During drainage, the impeller 8 is reversed by the pump 7. Then, since the resistance in the direction of the water supply port 10 is large due to gravity or the like, the water is not supplied and the cleaning water is reliably discharged from the drain port 11 to the drain hose 13 and discharged. Since the drainage port 11 is located near the substrate 16 of the inclined protruding wall 22, the diameter can be secured and the casing 9 can be prevented from becoming large.

FIG. 5 shows a sectional side view of the main part in another embodiment, in which the protruding wall 22 of the casing 9 is provided only at one corner near the substrate 16 and is not particularly inclined. The drain port 11 is provided on the protruding wall 22. Even in such a projecting wall 22, it was possible to make it a place where a negative pressure or a weak positive pressure is generated due to the ejector effect and the drop in the water supply pressure. Therefore, there is almost no drainage from the drainage port 11 during water supply (normal rotation).

In this way, during the water supply by the normal rotation of the impeller 8,
At 11, an appropriate negative pressure or a weak positive pressure should be generated, but if the filter is clogged with residual food or the like, and the negative pressure increases here, on the contrary, air will be supplied through the drain hose 13. As a result, the impeller 8 bites in the air and the water supply capacity is reduced. Therefore, as shown in FIGS. 6 (a) and 6 (b), the drain hose 13 has the intake / valve element 24 disposed in the rising portion 23. The intake / valve body 24 is formed by inserting a tubular upper body 25 and a lower body 26 into each other so as to sandwich a rubber valve seat 27. In the upper body 25, a stopper 28 is integrally formed, and a horizontal intake cylinder 29 is integrally provided on the upper portion of the upper body 25 to block the siphon phenomenon, and a ball valve 30 is provided between the valve seat 27 and the stopper 28. is doing.

Thus, the ball valve 30 normally rides on the valve seat 27 when the impeller 8 is rotating normally and closes the valve (see FIG. 6 (a)). Then, the valve rises and opens the valve (see FIG. 6 (b)). When the impeller 8 rotates forward for water supply and a negative pressure is generated at the drainage port 11, a force in the direction of further closing the valve is received, and the valve is kept closed and the drainage port 11 does not suck.

FIGS. 7A and 7B show another embodiment of the intake / valve body 24. Explaining the differences, the lower body 26 also serves as a valve seat, the stopper 28 and the valve seat 27 are omitted, and the ball valve
The flap valve 31 of the upward rotation type is provided in the valve chamber 29 instead of 30, and the operation is the same as that of the previous embodiment.

The valve configuration is not limited to the ball valve 30 and the flap valve 31.

(G) Effect of the Invention According to the present invention, it is possible to improve the switching function at the time of water supply and drainage with an extremely simple structure, to secure a flow rate, and to provide a high-performance dual-purpose pump. .

[Brief description of drawings]

FIG. 1 is a side sectional view of a dishwasher incorporating a water supply / drainage pump according to the present invention, FIG. 2 is a front sectional view of a main portion, FIG. 3 is a side sectional view of the main portion, and FIG. 4 is a perspective view of an impeller. FIG. 5 is a side sectional view of a main part in another embodiment, and FIG. 6 (a).
(B) is a sectional view of the drainage hose in another embodiment during water supply and drainage, and FIG. 7 (a) (b) is a view corresponding to FIG. 6 (a) (b) in a further embodiment. Is. 7 ... Pump, 8 ... Impeller, 9 ... Casing,
10 …… water supply port, 11 …… drain port, 12 …… suction port, 16 …… substrate, 18 …… blade, 21 …… outer edge, 22 …… protruding wall.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hajime Hajime 2-18, Keihan Hon-dori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References -42421 (JP, B1)

Claims (1)

[Claims] 1. A centrifugal impeller in which blades are erected vertically on a substrate and selectively forward and reverse, and a suction port which accommodates the impeller and opposes in the axial direction are provided.
A casing provided with a water supply port in a substantially tangential direction at the time of normal rotation, the outer edge of the impeller is inclined outward from the base plate, and a protruding wall facing the base plate toward the inner peripheral surface of the casing in the reverse direction. The water supply / drainage pump is characterized in that a drainage port is provided on the protruding wall in a substantially tangential direction at the time of reverse rotation.