JPH0669434B2 - Dishwasher - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dishwasher that sprays warm water mixed with a detergent onto dishes to wash away stains, and then rinses with warm air to dry.

"Conventional technology" Conventionally, there was a technique for washing dishes by forming a water tank at the bottom of the washing chamber into which dishes are put, and forming a water storage tank at the bottom of the washing chamber, and blowing up water from the water tank from the fountain blade. .

[Problems to be Solved by the Invention] In the conventional technology, the pump for draining the cleaning chamber in which the fountain vanes are arranged is also used as a pump for supplying water to the fountain vanes, and a simple structure is provided to facilitate cost reduction at the bottom. However, the structure that prevents water from leaking from the drain side while supplying water to the fountain vanes is complicated and expensive, and it is not possible to simplify the water leakage prevention structure and reduce the manufacturing cost easily. was there.

"Means for Solving Problems" However, the present invention is provided with a water feed pump having a single water feed blade that is normally and reversely rotated by a motor, and a water storage tank formed at the bottom of a washing chamber for storing dishes via a water absorption pipe. In addition to communicating the water absorption side of the water pump, the forward rotation discharge port of the water pump is connected to the fountain blades installed inside the washing chamber, and the drainage pipe is connected to the reverse discharge port of the water pump. A drain valve that is closed by the water flow due to the forward rotation of the water supply blade and opened by the water flow due to the reverse rotation of the water supply blade is provided at the reverse discharge port of the water pump, and a check valve that constantly biases the closing direction spring is provided on the drain pipe. The drain pipe between the drain valve and the check valve is provided with a return pipe on the lower surface side of the drain pipe in the vicinity of the reverse discharge port that extends substantially horizontally from the reverse discharge port of the water pump. It is connected to a water pipe near the water inlet of the water pump.

Therefore, when water is being supplied from the water pump to the fountain blade,
The water suction force of the water pump acts on the drain pipe between the drain valve and the check valve to maintain negative pressure, so the closed drain valve and the check valve are further pressurized in the closing direction to prevent water leakage. In addition, even if water leaks, it is possible to easily reduce the water supply loss by returning from the drainage pipe to the water supply pump, and it is possible to simplify the water leakage prevention structure and easily reduce the manufacturing cost compared to the conventional case. .

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. First
The figure is a cross-sectional side view, and a synthetic resin main body case (2) integrally forming a cleaning tank (1), a side cover (3) that is continuously connected and fixed to the rear side and left and right sides of the main body case (2), A lid cover (5), which is an upper lid that forms a door with a single plate-shaped body having lattice-shaped protrusions (4) on the inner surface of the upper surface, is provided, and the lid cover (5) is extended to the upper surface and the front surface. Then, the washing box (1) and the covers (3) and (5) form a rectangular box-shaped washing chamber (6).
And the lid cover (5) that can be opened and closed centering on the spindle (7) at the rear edge of the upper surface, and put dishes in through the guide rails (8) on both sides of the washing tank (1). Install (9) so that it can be freely moved in and out.

Further, a water supply port (10) is opened at the bottom of the cleaning tank (1), a water supply valve (12) having a water supply solenoid (11) is provided at the water supply port (10), and a water supply hose (13) communicating with water supply is provided. The water supply port (10) is connected through the valve (12), and the valve (12) is opened and closed to supply an appropriate amount of water into the cleaning tank (1).

In addition, a water storage tank (14) is formed at the bottom of the cleaning tank (1),
The water intake case (15) is fixed to the bottom of the tank (14), the tank (14) and the water intake case (15) are communicated with each other through a lattice plate (16) for preventing swirl, and also to the tank (14). The heater (17) is installed inside, the drawer (19) that is retracted by the spring (18) is attached, the removable dust case (20) is placed on the drawer (19), and the tank (14) is placed.
A dust case (20) is attached to the top surface so that it can be freely inserted and removed to collect dust.

In addition, a hollow water-conducting shaft (21) is located approximately in the center of the bottom of the cleaning tank (1).
Is fixed, a fountain vane (23) having a plurality of jet nozzles (22) is rotatably attached to the upper end of the water guide shaft (21), and a water feed pump (25) with a built-in water feed vane (24) is installed in a cleaning tank. (1) Installed on the bottom side of the bottom part, the forward rotation discharge port (26) of the pump (25) is connected to the lower end of the water guide shaft (21), and the reverse rotation discharge port (27) of the pump (25) is drained. Pipe (2
Drain hose (29) that connects 8) and communicates with the sewer
The drain pipe (28) is connected to the water intake pipe (32) via the check valve body (30) and the secondary side drain pipe (31), while the water suction pipe (32) communicating with the water intake case (15) is connected to the water pump (25). ) The water pump (2
5) Forward rotation of water from the tank (14) forward rotation (2)
6) to the washing room (6) while the water pump (2
5) Reverse the water in the tank (14) by reversing the outlet (2
It is configured to discharge from 7) to the sewer.

A control box (33) is attached to the front side of the main body case (2), and a start switch (34), a stop switch (35), a door open switch (36), etc. are arranged.

Furthermore, as is clear from FIG. 2, the drain pipe (28)
A check valve (38) is provided in the check valve body (30) to close the outlet side of the valve with the pressure of a spring (37), and the drain valve (38) is closed by the forward rotation of the water supply blade (24) and opened by the reverse rotation ( 39) is installed in the reverse outlet (27), and the drain pipe (2
8) The middle and the water absorption pipe (32)
8) It is connected by a return pipe (40) having a diameter smaller than (32), and the forward rotation discharge port (26) of the water pump (25) capable of forward and reverse rotation is communicated with the fountain blade (23). The reverse rotation discharge port (27) of the water supply pump (25) is connected to the drainage pipe (28) through the drainage valve (39), and the drainage pipe (28) is provided with a check valve body (30). Valve (39)
The drain pipe (28) between the check valve body (30) and the check valve body (30) is connected to the water suction side of the water pump (25).

Furthermore, as is clear from FIG. 3, the dust case (2
A plurality of water leakage holes (41) are opened in the dust receiver of (0), and the dust case (20) is attached against the notch (42) of the dust case (20) against the spring (18). The water pump (25) includes a dust extraction mechanism (45) having a lock arm (43) supported at a position and a dust extraction solenoid (44) for ejecting the lock arm (43) from the notch (42). In association therewith, the solenoid (44) is controlled, and a dust case (20) for receiving the washed dust is provided in the cleaning chamber (6) so that it can be freely moved in and out, and after the cleaning operation and before the rinsing operation is finished. The dust case (20) is automatically moved to the outside of the cleaning chamber (6).

Further, a magnet (46) is embedded and fixed in the dust case (20), and a reed switch or the like is operated by the magnet (46) at a mounting position where the lock arm (43) is engaged with the notch (42). The dust receiving sensor (47) is fixedly supported on the body case (2), and the dust case (2
0) When mounting is detected, based on the detection result of this sensor (47), the water supply valve (12) and the water pump (25)
The cleaning chamber (6) is equipped with a sensor (47) for performing a water supply and cleaning operation only when the dust case (20) is mounted inside the cleaning chamber (6), and is separated from the cleaning tank (1). The sensor (47) is attached to the body case (2) side.

Further, as is clear from FIG. 4, a plurality of hooks (4) are provided at the upper opening edge of the water guide shaft (21) made of synthetic resin.
8) is integrally formed, and the hook (4) is attached to the inner end surface of the boss (49) of the fountain blade (23) fitted to the outer circumference of the water guide shaft (21).
8) ... is locked, the boss portion (49) is rotatably fitted and supported on the water guide shaft (21), and the thin wall groove (50) is provided on the upper surface side of the fountain blade (23) facing the boss portion (49). ) Is formed and a detachable injection nozzle (22) is provided at a substantially central position of the fountain blade (23) facing the boss (49), and when the fountain blade (23) is removed, A notch is formed to form an opening, or a central nozzle (22) is removed to form an opening, and a jig is inserted from the opening to detach the hook (48). The discharge port (26) of the water pump (25) ) Is attached by a hook (48) as an engaging means so as to be freely rotatable.

Further, as is clear from FIGS. 4 and 5, the washing motor (51) for rotating the water supply pump (25) in the forward and reverse directions is provided, and the blade portion (24a) and the disk portion integrally bonded and fixed. A shaft hole (53) is formed in the shaft part (52) of the water supply blade (24) consisting of (24b), and a retaining ring (54) and a key (55) for retaining are placed inside the shaft hole (53). It is provided.

Further, a rotary shaft (56) fitted into the shaft hole (53) is provided in the motor (51), and a key (55) is engaged with a wheel groove (57) into which the protrusion wheel (54) is engaged. A key groove (58) is formed on the rotary shaft (56), and a spring (59) is elastically wound around the outer circumference of the shaft portion (52). The water supply blade (24) is built into the water supply pump (25). A spring (59) is wound around the outer periphery of the shaft part (52) of the water supply blade (24) with respect to the rotating shaft (56) to be inserted.
The shaft part (52) is elastically fixed, and the water supply blade (24) is fixedly supported by the rotating shaft (56).

In addition, it is configured such that by operating the water supply pump (25), compressed air is discharged from the fountain blades (23) into the washing chamber (6) to dry the dishes.

Further, as is apparent from FIG. 6, the lock body (67) which slides through the pin (64) and the long hole (65) to move in and out of the notch (66) of the lid cover (5), and the output gear. (68
a) and an automatic lock motor (68) for reciprocally sliding the lock body (67) via the rack gear (68b), and an advance / retreat switch (69) for controlling the motor (68) in the forward and reverse directions.
An interlock mechanism (71) provided with (70) is provided, and the lock body (67) is engaged with the notch (66) to fix and support the lid cover (5) in the closed position. A lock body (67) that is a locking means for restricting the opening operation of the lid cover (5) that is a door is provided, and the lock body (67) is released by operating the door open switch (36) or turning off the power. Is configured.

Further, as is apparent from FIG. 7, a washing circuit (72) including a microcomputer is provided, and the switches (34) to (36) (69) (70) and the dust receiving sensor (47) are provided in the circuit. The solenoid (11) (44) (60) is connected to the circuit (72) while being connected to the circuit (72). The sensor (47) may be attached at a position where the operation of the solenoid (44) is detected.

In addition, the heater (17) is connected to the circuit (72) through the AC circuit (73) and the half-wave rectification circuit (74) so that the heater (17) installed in the cleaning chamber (6) can be used as a power source for the AC. The cleaning motor (51) is configured to selectively use the output and the half-wave rectification output, and the forward rotation and reverse rotation circuits (75) (76) are used, and the forward rotation and reverse rotation circuits (77) (78) are also provided. The auto lock motor (68) is connected to the circuit (72) through the output of the automatic lock motor (68) to continuously and automatically wash, rinse and dry the dishes.

This embodiment is configured as described above. The lid cover (5) is opened and closed to put the shelves (14) in which dishes are arranged in the washing chamber (6) and the dust case (17) is set to the main body case ( The water supply cleaning operation is started as shown in the flow chart of FIG. 8 by mounting the water supply valve (12) at the predetermined position of 2) and operating the start switch (34). The water is opened, a predetermined amount of water is put into the water storage tank (14), and the water in the tank (14) is heated by a heater (17) which is continuously operated through an AC circuit (73).

Then, the forward rotation of the water pump (25) causes the tank (1
The water of 4) is sent to the fountain vane (23), and the jet nozzle (22)
Water is jetted upward from the washing chamber (6), the blade (23) is rotated by the jetting force of the water, and the jetted water hits the dishes to wash away the dirt, while reaching the ceiling of the washing chamber (6). The scattered water falls from the surface of the ridge (4) almost directly below, and the stains on the dishes are washed off from the upper surface side.

In addition, dirty water that has dropped to the bottom of the cleaning tank (1) is
After returning to the tank (14) through (0), dust is collected, only water is circulated, and dishes are washed for a certain period of time.

Further, when the washing time has elapsed, the water supply pump (25) rotates in the reverse direction to discharge the dirty water in the tank (14), and the water supply valve (12) is opened to newly supply water, and the water supply pump (25) is turned on. The first rinsing is performed by rotating in the forward direction. When the first rinsing operation is completed after a certain period of time, the dust removal solenoid (44) is activated and the spring (18) moves the dust case (20) to the outside of the wash water circulation path as shown in FIG. While waiting, the water in the tank (14) is replaced to perform the second rinsing operation and the third rinsing operation as in the first rinsing operation.

Further, when the rinsing operation is completed, all the water in the tank (14) is discharged, the heater (17) is intermittently operated via the half-wave rectifier circuit (74), and the intake solenoid valve (60) operates the intake valve ( 61) open operation, water pump (25)
To dry the dishes with the air heated by the heater (17) by injecting compressed air into the cleaning chamber (6) through the normal rotation discharge port (26) and the fountain vane (23). .

Further, as shown in the flow chart of FIG. 9, when the stop switch (35) is operated or the power is turned off, like the door open switch (36) operation, the exit switch (70)
The auto lock motor (68) is operated so that the lock is turned on, and the notch (66) of the lid cover (5) moves from the lock body (67).
When the above cleaning operation is performed by operating the start switch (34) while escaping the
The auto lock motor (68) is operated so that the lock is turned on, the lock body (67) is retained in the notch (66) of the lid cover (5), and the lid cover (5) is fixedly supported at the closed position. ,
It prevents the lid cover (5) from opening during cleaning.

"Effects of the Invention" As is apparent from the above embodiments, the present invention is directed to the motor (51).
Water supply pump (25) with a single water supply vane (24) that reverses forward and backward by means of water supply pipe (32) to the water storage tank (14) formed at the bottom of the washing room (6) for storing dishes The water suction side of the pump (25) is communicated, the forward rotation discharge port (26) of the water pump (25) is communicated with the fountain blade (23) installed inside the cleaning chamber (6), and the water pump (25) In the dishwasher, the drain pipe (28) is communicated with the reverse rotation discharge port (27) of the No. 1, and the closing operation is performed by the water flow due to the forward rotation of the water supply blade (24), and the opening is performed due to the water flow due to the reverse rotation of the water supply blade (24). The drain valve (39) is provided at the reverse rotation outlet (27) of the water pump (25), and the check valve (38) for constantly urging the closing direction spring (37) is provided at the drain pipe (2).
8), the drain pipe (28) between the drain valve (39) and the check valve (38), the reverse rotation outlet (27) of the water pump (25)
The lower surface of the drainage pipe (28) near the reverse discharge port (27) that is extended substantially horizontally from is connected to the water supply pipe (32) near the water intake port of the water pump (25) by the return pipe (40). When water is being supplied from the water pump (25) to the fountain vane (23), the suction force of the water pump (25) is applied to the drain pipe (28) between the drain valve (39) and the check valve (38). Since it acts and is maintained at a negative pressure, the drain valve (39) and the check valve (38) in the closed state are further pressurized in the closing direction to prevent water leakage, and even if water leaks, the drain pipe ( By returning to the water pump (25) from 28), it is possible to easily reduce the water supply loss, and to achieve a practical effect such that the water leakage prevention structure can be simplified and the manufacturing cost can be easily reduced compared to the conventional case. It is a thing.

[Brief description of drawings]

1 is a sectional side view showing an embodiment of the present invention, FIG. 2 is an explanatory view of a water pump, FIG. 3 is an explanatory view of a dust case, and FIG.
The figure is an illustration of the fountain blade and the water supply pump, FIG. 5 is an exploded view of the water supply blade, FIG. 6 is an illustration of the interlock mechanism, FIG. 7 is a control circuit diagram, and FIGS. 8 and 9 are flowcharts. is there. (6)… Washing chamber (23)… Fountain blade (25)… Water pump (26)… Normal discharge port (27)… Reverse discharge port (28)… Drainage pipe (30)… Check valve body (39) … Drain valve

Claims (1)

[Claims] 1. A water storage tank (14) which is provided at the bottom of a washing chamber (6) for storing dishes, comprising a water feed pump (25) having a single water feed vane (24) which is normally and reversely rotated by a motor (51).
A water fountain blade (23) that connects the water absorption side of the water pump (25) to the water absorption pipe (32) through the water absorption pipe (32) and installs the forward rotation discharge port (26) of the water pump (25) inside the cleaning chamber (6). In the dishwasher in which the drain pipe (28) is connected to the reverse rotation outlet (27) of the water supply pump (25), the dishwasher is closed by the water flow due to the forward rotation of the water supply blade (24), and the water supply blade ( The drain valve (39) that opens and operates by the water flow due to the reverse rotation of (24) is provided in the reverse discharge port (27) of the water pump (25), and the check valve (38) that constantly biases the closing direction spring (37) is provided. The water supply pump (2) is installed in the drain pipe (28), and the drain pipe (28) between the drain valve (39) and the check valve (38) is used.
5) The reverse side of the drainage pipe (28) in the vicinity of the reverse discharge port (27) extending substantially horizontally from the reverse discharge port (27) is connected to the return pipe (40) near the water intake port of the water supply pump (25). A dishwasher characterized by being connected to a water supply pipe (32).