JPH0614861A - Dishwasher - Google Patents

Abstract

PURPOSE:To improve the activity of detergents in the washing tub of the dishwasher. CONSTITUTION:The detergents are stocked in a washing tub 38 installed downward a washing chamber 33, an opening part 41 to be freely opened/closed is provided at the bottom of the washing tub 38, and a filter 43 is provided in the duct of washing liquid flowing out of the opening part 41. Therefore, when the opening part 41 is opened, the washing liquid of low activity stocked at the bottom of the washing tub 38 is preferentially and automatically discharged, and the dregs of the washing liquid are filtered by the filter 43. On the other hand, since a detergent pump 67a is driven by the pressure of rinsing liquid supplied from a rise pump 65 through a branch 68, a driving source exclusive for a detergent supplier 67 is unnecessitated, and further, the detergents are heated by thermal exchange with the rising liquid in the detergent pump 67a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for business use, and more particularly to an improvement of a dishwasher in which the activity of detergent in a washing tank is improved.

[0002]

2. Description of the Related Art A dishwasher is a dishwasher for washing dishes by injecting a washing liquid and a rinse water pressurized by a pump in order from the vertical direction onto dirty dishes placed in a washing room.

FIG. 13 shows an example of a conventional dishwasher. The dishwasher 1 has a box shape, and a washing chamber 2 is formed in the center thereof. The cleaning chamber 2 is divided into upper and lower parts, and an upper part thereof is a lid 3 which can be moved up and down along the back surface. On the other hand, on the upper end of the lower part of the washing room 2 is a rack 5 on which the dishes 4 are mounted.
Can be installed, and guide rails 6 for defining the installation position of the rack 5 are provided at the front and rear ends thereof.

Tables 7 and 8 are installed on the sides of the dishwasher 1 in such a manner that their side surfaces are in parallel with and in close contact with the side surfaces of the dishwasher 1. These tables 7, 8
Among them, a water tank 9 for temporarily storing the used tableware 4 is formed especially on the table 7 on the left side in FIG. 13, and the rack 5 can be installed at the upper end of the water tank 9. The widths of the tables 7 and 8 in the front-rear direction and the heights of the upper ends are the same as those of the lower portion of the cleaning chamber 2.

The dishwasher 1 is constructed, for example, as shown in FIG. In FIG. 14, reference numeral 10 is a cleaning tank that is formed below the cleaning chamber 2 and stores the cleaning liquid.
Reference numeral 11 is a main cleaning nozzle that sprays the cleaning liquid onto the dishes, and reference numeral 12 is a main cleaning pump that supplies the cleaning liquid in the cleaning tank 10 to the main cleaning nozzle 11. Further, reference numeral 13 is a water heater that preheats raw water such as tap water. As the water heater 13, a commercially available domestic water heater installed outside the dishwasher 1 is used.

Reference numeral 14 is a booster for further heating the hot water supplied from the water heater 13 to obtain high-temperature rinse water, and reference numeral 15 is a rinse pump for supplying the rinse water supplied from the booster 14 to the rinse nozzle 16. . Here, the paths from the cleaning tank 10 to the main cleaning nozzle 11 and from the water heater 13 to the rinsing nozzle 16 are all connected by a pipe line 17.

On the other hand, reference numeral 18 is a detergent supply device comprising a detergent pump 18b for pumping the detergent in the detergent tank 18a and a hose 18c for supplying the pumped detergent to the cleaning tank 10, and the detergent pump 18b is operated. The time is synchronized with the operating time of the rinse pump 15.

Reference numeral 19 is a drainage channel for discharging the excess cleaning liquid and maintaining the water level of the cleaning tank 10 constant, and its upper end 19a is opened on the same plane as the proper water level in the cleaning tank 1. Further, reference numeral 20 is a filter installed at the upper part of the washing tank and used to filter and remove residues such as food residue attached to the dishes.

The washing operator installs the rack 5 on the table 7, transfers the dishes 4 in the water tank 9 to the rack 5, and then the lid 3
Is manually opened, the rack 5 is moved in parallel in the direction of the arrow in FIG. as a result,
Since the front and rear positions of the rack 5 in the cleaning chamber 2 are positioned, the lid 3 is closed after the left and right positions of the rack 5 are visually positioned.

Then, a limit switch (not shown) installed on the lid 3 is actuated, and the main cleaning pump 12 causes the cleaning liquid to be sprayed from the main cleaning nozzle 11 toward the dishes 4, and the rinse pump 15. The rinsing process in which the rinsing water is sprayed from the rinsing nozzle 16 toward the dishes by the action is repeated at regular intervals using a method such as timer control, and the dishes are automatically washed. The cleaning liquid and the rinsing water both flow into the cleaning tank 10, and at that time, the residue attached to the dishes is filtered out by the filter 20. Further, the excess cleaning liquid is drained from the upper end 19a of the drainage channel.
Drained from.

On the other hand, the detergent concentration in the cleaning liquid decreases due to the inflow of rinsing water sprayed from the rinsing nozzle 16 in the rinsing stroke, but as described above, the operating time of the detergent supplying device 18 and the operating time of the rinsing pump 15 are the same. Because they are in sync
By the action of the detergent supply device 18, a constant amount of detergent is supplied to the cleaning tank 10 for each rinsing stroke. As a result, cleaning tank 1
A decrease in detergent concentration at 0 is prevented.

After the washing is completed, the lid 3 is opened again, and the rack 5 on which the washed dishes 4 are mounted is moved in parallel in the direction of the arrow in FIG. The washing worker repeats this work according to the number of dishes 4 to be washed.

[0013]

Generally, in a dishwasher, both the cleaning liquid sprayed from the main cleaning nozzle 11 and the rinse water sprayed from the rinse nozzle 16 are collected in the cleaning tank 10, Since the dirt adhering to No. 4 is mixed with the cleaning liquid together with the cleaning, the cleaning liquid may gradually become dirty as the cleaning is repeated, and the activity (cleaning capacity) of the cleaning liquid may be reduced.

Therefore, in the conventional dishwasher described above, the rinse water is caused to flow into the cleaning tank 10 in accordance with the rinse process as described above, and the detergent is supplied in synchronization with the rinse process. The cleaning liquid was purified and renewed by overflowing and discharging the cleaning liquid from the upper end 19a of the drainage channel.

From the viewpoint of purifying and renewing the cleaning liquid, it is desirable that the wastewater discharged from the cleaning tank 10 with the inflow of rinsing water is a cleaning liquid which becomes dirty and its activity is reduced with the use for several times. In the case of the conventional dishwasher described above, both the rinse water and the detergent are supplied to the cleaning tank 10 from above. Therefore, the cleaning liquid closer to the liquid surface in the cleaning tank 10 has a lower frequency of use and thus has a higher activity and becomes dirty and active. The cleaning liquid having a reduced value tends to accumulate at the bottom. Therefore,
When the cleaning liquid is discharged due to overflow from the drainage channel upper end 19a, the cleaning liquid with the highest activity near the liquid surface is directly discharged, while the cleaning liquid with low activity accumulated at the bottom is difficult to be discharged, and cleaning and renewal of the cleaning liquid is not always sufficient. There was a problem that it was not done.

Further, the residue mixed in the cleaning liquid during the main cleaning process is accumulated in the filter 20 installed in the upper part of the cleaning tank 10, but since the filter 20 is installed in the upper part of the cleaning tank 1, the main cleaning is performed. When the cleaning liquid is circulated in the process, the cleaning liquid always circulates through the layer of the residue accumulated in the filter 20, and as a result, the activity (alkali activity) of the cleaning liquid is lowered by the chemical reaction with the residue. There was also a problem.

On the other hand, it is generally known that the activity of detergents increases as the liquid temperature rises. However, in the case of the conventional dishwasher 1, since the detergent tank 18a is normally installed outside the dishwasher 1 for the purpose of facilitating the replenishment of the detergent, the detergent in the detergent tank 18a is usually at room temperature. Has become. As a result, especially in winter and the like, the liquid temperature of the detergent decreases as the temperature decreases, and it may be difficult to obtain a highly active detergent.

In this case, in order to prevent the activity of the detergent from decreasing, a method may be considered in which a preheating device is attached to the detergent tank 18a and the detergent in the detergent tank 18a is heated or kept warm. However, since a new preheating device is naturally attached to the detergent tank 18a, it causes a rise in manufacturing cost. Ignored and washed with a room temperature detergent.

Further, in the case of the dishwasher 1 described above, since a dedicated motor is used to drive the detergent pump 18b, not only the manufacturing cost and running cost of the detergent supply device 18 increase, but also the detergent supply device. There was a problem that the whole 18 became large and could not sufficiently cope with the miniaturization of the dishwasher. In addition, it has been necessary to take great care in waterproofing and preventing electric leakage in the motor.

[0020]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, in which a rack containing a cleaning object is installed in a cleaning chamber opened and closed by a lid that moves up and down, and below the cleaning chamber. The main cleaning process in which the cleaning liquid in the cleaning tank formed in the above is circulated by the main cleaning pump while being sprayed from the main cleaning nozzle toward the object to be cleaned, and the raw water supplied from the water supply source is heated by the heating means. In a dishwasher that performs a rinsing step of spraying rinsing water from the rinsing nozzle toward the object to be cleaned by the pressure of the rinsing pump,

An opening is formed at the bottom of the cleaning tank, and a detergent tank for containing detergent in a space isolated from the cleaning tank, and a detergent pump for supplying the detergent from the detergent tank to the cleaning tank. Is provided, and the supply of the detergent to the cleaning tank in the detergent pump is performed by a member that is deformed according to the pressure supplied from the piping system of the rinse pump, and the flow of the cleaning liquid flowing out from the opening is provided. A filter is provided in the passage for filtering out the residue in the cleaning liquid, and an opening / closing control means for opening the opening is provided between the main cleaning process and the rinsing process. Is.

[0022]

In the dishwasher of the present invention, since the opening is provided at the bottom of the cleaning tank, when the excess cleaning solution is discharged out of the circulation system of the cleaning solution, the cleaning solution having low activity accumulated at the bottom of the cleaning tank. Are discharged preferentially and automatically. Moreover,
Since the filter for filtering the residue in the cleaning liquid is provided in the flow path of the cleaning liquid flowing out from the opening, the contact between the cleaning liquid in the cleaning tank and the residue accumulated in the filter is prevented.

Further, since the detergent pump is driven by the pressure of the rinse liquid fed from the piping system of the rinse pump,
A drive source dedicated to the detergent pump is unnecessary, and the detergent is heated by heat exchange between the detergent and the rinse liquid in the detergent pump. Further, since the detergent pump does not use electricity, it is not necessary to waterproof the detergent pump.

Further, since the opening is opened by the action of the opening / closing control means between the main cleaning process and the rinsing process, after the used cleaning liquid is discharged by opening the opening. Detergent is supplied by the detergent pump.

[0025]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 shows an example of a dishwasher 30 according to the present invention. In FIG. 1, reference numeral 31
Is the dishwasher container. The container 31 has a box-like shape, and an upper portion thereof is a lid 32 that is vertically movable with its front surface and both side surfaces integrated with each other. Inside the lid 32, a cleaning chamber 33 is formed.

A rack 34 for mounting dishes in the washing room 33
Can be installed, and a pair of guide rails 35 that define the installation position of the rack 34 are provided at the front and rear ends thereof.
It is provided parallel to the front surface of 0. Further, a pair of main cleaning nozzles 36, 36 and rinsing nozzles 37, 37 are installed downward or upward at both the upper end and the lower end of the cleaning chamber 33, respectively.

A washing tank 38 for storing a washing liquid is formed below the washing chamber 33, and a main washing pump 39 is installed below the washing tank 38, and a main washing nozzle is provided from the washing tank 38 via the main washing pump 39. The paths leading to 36, 36 are connected by a cleaning pipe 40. Here, in the dishwasher of the present invention, the opening 41 is formed at the bottom of the cleaning tank 38,
The opening 41 can be opened and closed by an automatic opening / closing valve 42. As the automatic opening / closing valve 42, for example, a solenoid valve or the like is used. The opening / closing of the automatic opening / closing valve 42 is controlled by an opening / closing control means (not shown). Further, below the automatic opening / closing valve 42, a filter 43 for filtering the residue in the cleaning liquid is provided. The filter 43 is a removable basket-like member made of, for example, stainless steel or the like, and has a structure capable of passing a liquid but not a solid substance. Reference numeral 44 is a waste water tank that supports the filter 43.

Reference numeral 45 is a water supply source such as water supply, and reference numeral 4
6 is a water heater. The hot water heater 46 heats the raw water supplied from the water supply source 45 to generate high-temperature rinse water.
It is housed in a container 47.

The structure of the hot water heater 46 is shown in FIG. In FIG. 2, reference numeral 48 is a water supply valve for controlling the inflow of the raw water into the hot water heater 46, reference numeral 49 is a flow sensor for measuring the inflow amount of the raw water, and reference numeral 50 is a thermistor for measuring the temperature of the raw water. Here, the flow rate sensor 49 also functions as an empty heating prevention device. That is, when the flow rate of the raw water becomes equal to or lower than the set flow rate of, the heating of the raw water in the water heater 46 is automatically stopped by the action of the flow rate sensor 49, and the empty heating is prevented.

Reference numeral 51 is a combustion chamber. Inside the combustion chamber 51,
A burner 53 is installed which uses gas as fuel and discharges the frame upward from the ceramic blade 52 formed at the upper end. Further, reference numeral 54 is an extinguishing safety device (frame rod) for detecting the presence or absence of the frame, reference numeral 5
Reference numeral 5 is a pressure equalizing valve that supplies gas to the burner 53 and adjusts the supply amount thereof, and reference numeral 56 is a fan motor that supplies and exhausts the combustion chamber.

A heating chamber 57 is formed above the combustion chamber 51, and a water supply valve 48 is provided around and inside the heating chamber 57.
A heating pipe 58 connected to the heating pipe 58 is arranged in a meandering manner.
Reference numeral 59 is a thermal fuse for preventing overheating of the heating chamber 57, reference numeral 60 is a freeze prevention heater for preventing freezing in the heating tube 58 at low temperatures, and reference numeral 61 is the heating tube 5.
A boiling prevention device for preventing boiling of rinse water in
Reference numeral 62 is a thermistor for measuring the temperature of the rinse water after heating.

A tank 63 is arranged near the heating chamber 57. This tank 63 is for storing high-temperature rinse water heated by the water heater 46, and its capacity is
It is set according to the inflow speed of the rinse water into the tank 63, the operating time of the hot water heater 46, and the required time for the rinsing stroke (described later). Further, reference numeral 64 is a float switch. This is to prevent excessive supply of rinse water by detecting when the amount of stored water in the tank 63 exceeds a certain value and automatically closing the water supply valve 48. Furthermore,
A rinsing pump 65 is installed in the vicinity of the bottom of the tank 63, and routes from the water supply source 45 to the hot water heater 46 and from the tank 63 to the rinsing nozzles 37, 37 via the rinsing pump 65 are all connected via a water supply pipe 66. .

On the other hand, reference numeral 67 is a detergent supply device. The detergent supply device 67 includes a detergent tank 67a, a detergent pump 67b installed at the bottom of the detergent tank 67a, and the detergent pump 67b.
Hose 67c connected to the hose 67c.
The end of c is opened on the surface of the cleaning liquid in the cleaning tank 38.
Further, a branch 68 is formed at an arbitrary position in the water supply pipe 66 that connects the rinse pump 65 and the rinse nozzles 37, 37, and the end of the pipe 69 extending from this branch 68 is connected to the detergent pump 67b. .

The structure of the detergent pump 67b is shown in FIG. In FIG. 3, reference numeral 100 denotes a cylindrical outer container, the upper end of which is sealed by a disc-shaped upper lid 101. A screw hole 101a is formed in the center of the upper lid 101 along its axis, and a detergent supply amount adjusting screw 102 is screwed into the screw hole 101a from the outside. The tip of the detergent supply amount adjusting screw 102 projects into the external container 100 through the screw hole 101a. The top lid 101 further has a rinse water inlet 1
03 is formed and the tip of the pipe 69 is connected to the nozzle 104 screwed into the rinse water inlet 103.
Then, rinsing water can be injected into the outer container 100 via the pipe 69.

The inner circumference of the outer container 100 is reduced in diameter at the lower end into a mortar shape, and a through hole 105 is formed on the axis of the lower end. Further, a cylindrical inner container 107 with a bottom, in which a bellows 106 that can be expanded and contracted in the axial direction is formed on the side surface of the outer container 100, is inserted with its bottom portion facing upward. The inner container 107 has a tip portion 10
7a, it becomes thicker and has a reduced diameter, and is inserted and supported in the through hole 105 from above.

An annular support plate 108 is abutted and fixed to the lower end surface of the outer container 100 with screws or the like.
A through hole 108a is provided at the center of 08,
It is formed to have the same diameter as the inner diameter of a and to be coaxial.
Further, the lower end surface of the outer container 100 and the support plate 108 are
-Closed by a ring 109.

Reference numeral 110 is a tip member. The tip member 110 has a cylindrical shape, one end side of which is reduced in diameter and the periphery thereof is threaded to form a male screw portion 110a, and the other end side of which is enlarged to form a flange portion 110b. ing. On the other hand, reference numeral 111 is a liquid feed port that penetrates the tip member 110 in the axial direction, and the liquid feed port 111 is gradually reduced in diameter toward the end face side of the flange portion 110b.
It opens from the end face of 10b. And this liquid delivery port 1
A steel ball 112 movably installed inside the steel ball 11 and the steel ball 11
The check valve 114 that prevents the liquid from flowing toward the end surface of the flange portion 110b in the liquid supply port 111 is formed by the screw 113 that restricts the excessive movement of the second portion.

Check valve 114 on the side surface of flange 110b
A detergent supply port 110c is formed at a position that is not affected by, and the tip of the hose 67c extending to the cleaning tank 38 is connected to the nozzle 115 screwed into the detergent supply port 110c. Then, by screwing the male screw portion 110a into the female screw formed on the inner peripheral surface of the tip portion 107a, the tip member 110 is connected to the outside while the inside of the inner container 107 and the liquid supply port 111 are connected. It is fixed to the container 100. As the material of the inner container 107, a resin having excellent durability under high temperature conditions, such as polypropylene, is used.

On the other hand, reference numeral 75 designates a shaft which is rotatably supported on the back surface 31a of the container 31 about its own axis.
A first arm 74 is fixed to the. The first arm 74 is disposed around the lid 32 as shown in FIG. 4, and is connected to the lid 32 via a second arm 76 rotatably supported at the center of both side surfaces of the lid 32. In addition, the side of the first arm 74 located on the front side of the dishwasher 30 is used as a handle for opening and closing the lid 32. Further, the lower end of the back surface 31a and the shaft 75 are connected by a pair of springs 77, 77. In addition, a lid opening / closing device 78 is installed between the upper end of the back surface 31a and the shaft 75, and the back surface 31a and the shaft 75 allow the dishwasher 30 to be installed.
Supported by.

The structure of the lid opening / closing device 78 is shown in FIGS. Reference numeral 201 is a frame that supports the drive mechanism of the lid opening / closing device 78, and the frame 201 is fixed to the back surface 31a via a mounting portion 201a formed on the side of the upper end portion thereof.

An electric motor 202 capable of rotating in the forward and reverse directions is fixed to the frame 201. The drive shaft 203 of the electric motor 202 is parallel to the back surface of the dishwasher and is connected to the frame 2
01, and a spur gear (gear on the electric motor side) 204 is attached to the tip end thereof so as to be coaxial with the drive shaft 203.

Further, as shown in FIGS. 5 and 7, a pair of bearing members 205 are fixed to the lower surface of the frame 201 by a method such as screwing, and each has a semicircular shape formed on the lower surface of the bearing member 205. The shaft 75 is in contact with the recess 206 so as to be rotatable about its axis. As a result, the frame 201 is fixed to the back surface 31a via the mounting portion 201a and is also supported by the shaft 75. Here, for the bearing member 205, a metal having a small friction coefficient, such as brass, is used.

On the other hand, on the shaft 75, as shown in FIGS. 5 and 6, a semicircular gear (a gear on the shaft side) 207 is coaxial with the shaft 75 and meshes with the spur gear 204.
It is removably fixed by a method such as screwing via a mounting member 208. In this case, the position of the gear 207 on the shaft 75 is such that when the lid 32 reaches the lower limit point and the upper limit point by rotating the shaft 75, one end and the other end (reference numeral in FIG. 6) of the gear 207 in the width direction. The positions A and B) are in mesh with the spur gear 204. Also,
Since the diameter of the gear 207 is larger than that of the spur gear 204, the rotation amount of the gear 207 with respect to the rotation of the spur gear 204 is small.

Numerals 209a and 209b are microswitches, which detect the lower limit point and the upper limit point of the lid 32 by the interaction with the disk-shaped member 210 attached to the outer peripheral surface of the shaft 75, and detect the electric motor. ON of 202
/ OFF is performed.

Further, in the case of the dishwasher 30 of this embodiment,
A rack stopper 79 for fixing the right and left positions of the rack 17 to an appropriate position is fixed inside the back surface 31a. The structure of this rack stopper 79 is shown in FIG.

In FIG. 8, reference numeral 301 is a frame of the rack stopper 79, and the frame 301 is the rear surface 31.
It is fixed to the inside of a with screws or the like. Also, reference numeral 302
Is an axis that penetrates the frame 301 in parallel and horizontally to the back surface 31 a, and the axis 302 is a side surface 3 of the frame 301.
The holes 01a and 301b are inserted rotatably and movable along the shaft washing.

One end of the shaft 302 is the side surface 3 of the frame 301.
01a protrudes from the table and has a shaft 30 at its tip.
A stopper (regulating member) 303 that regulates the movement of the 2 toward the other end is provided. On the other hand, the other end of the shaft 302 protrudes from the side surface 301b of the frame 301, and the rear dishwasher 3
The first lever 304 that bends to the front side of 0 and protrudes to the front side beyond the guide rail 35 on the back side 31a side.
Has become. Here, the movement amount C of the first lever 304 in the direction of the other end is determined by the side surface 301a and the stopper 303.
The surface on the other end side of the first lever 304 when the rack 34 contacts the rack 34 at an appropriate position in the cleaning chamber 33.
Is adjusted so as to overlap with the position of the rack side surface 34a when installed.

Reference numeral 305 is the first lever 304.
The front side of the dishwasher 30, the rear side 3
A second lever 306, which is attached to the shaft 302 so as to face the 1a side, is a stopper that is provided on the table 20 side of the second lever 305 and that restricts the movement of the shaft 302 in the one end direction.

Reference numeral 307 is a magnet, and this magnet 307 is
Like the second lever 305, when the first lever 304 is directed to the front surface side of the dishwasher 30, the magnetic lines of force are attached to the shaft 302 so as to face the back surface 31a side.
Further, when the shaft 302 is moved toward the other end outside the rear surface 31a until the frame side surface 301a and the stopper 303 come into contact with each other, the magnet 307 is sandwiched by the rear surface 31a.
A magnetic sensor (magnetism detection means) 308 for detecting the magnetism of the magnet 307 is installed at a position facing the magnet 307.

Moreover, the magnetic sensor 308 is automatically closed by the motor 202 of the lid opening / closing device 78 with a certain time lag from the time when the magnetic sensor 308 detects magnetism by a sequencer or the like. Are linked together. A spring 309 is wound around the shaft 302 corresponding to the first lever 304 side of the magnet 307, and the action of this spring 309 causes the shaft 302 to be constantly pressed to the one end side.

Next, a process of washing dishes (objects to be washed) by the dishwasher having the above structure will be described below with reference to the timing chart shown in FIG.

When the dish washer is operated, the automatic opening / closing valve 42 is closed to store a predetermined amount of washing liquid in the washing tank 38 in advance, and as shown in FIG. On the other hand, the tables 80 and 81 are installed in parallel with the dishwasher 30 with their side surfaces parallel and in close contact with the side surfaces of the dishwasher 30, respectively. Here, a water tank 82 for temporarily storing used tableware is formed on the table 80, and a pair of rails 83 for installing the rack 34 are provided at the front and rear ends of the upper surfaces of the tables 80, 81.
It is provided parallel to the front surface of 81. The widths of the tables 20 and 23 in the front-rear direction and the heights of the upper ends are the same as the upper ends of the cleaning chamber 33.

When the lid 32 of the dishwasher 30 is closed, the gear 207 of the lid opening / closing device 78 meshes with the spur gear 204 at the position A in FIG.
09a is pressed by the disk-shaped member 210 outward in the radial direction of the shaft 75 and is in an ON state. In this state, when the electric motor 202 is normally rotated by the operator's judgment, sequence control, or the like, the gear 207 rotates in the direction B in FIG. 6 via the drive shaft 203 and the spur gear 204.

Therefore, the shaft 75 to which the gear 207 is fixed rotates in the X direction in FIG. 7, but the first arm 74 has the shaft 75.
Since the shaft 32 is pivotally supported and is connected to the lid 32 via the second arm 76, the lid 32 is lifted and the lid 32 is opened when the shaft 75 is rotated.

When the lid 32 is fully opened, the micro switch 209b is pushed outward by the disc member 210 in the radial direction of the shaft 75 to be turned ON, and the upper limit point of the first arm 74 is detected to detect the electric motor. The rotation of 202 stops,
The lid 32 stops when it is fully opened. Therefore, the washing operator installs the rack 34 on the rail 83 of the table 80, moves the dishes in the water tank 82 into the rack 34, and then moves the rack 34 in parallel along the rail 83 in the arrow direction in FIG. Let As a result, the rack 34 moves between the guide rails 35, and the front and rear position of the rack 34 in the cleaning chamber 33 is automatically defined as an appropriate position.

When the rack 34 is further translated along the guide rail 35 in the direction of the arrow as it is, the rack side surface 34a presses the surface of the first lever 304 on the table 80 side, and the first lever 304. Moves in the direction of the table 81 together with the rack 34 from the state shown in FIG.

When the side surface 301a of the frame 301 and the stopper 303 come into contact with each other, the movement of the first lever 304 is restricted by the stopper 303, and the movement of the rack 34 is stopped accordingly. This state is shown in FIG.
In this case, as described above, the table 8 of the first lever 304
Since the surface on the 0 side overlaps with the proper position of the rack side surface 34a in the washing chamber 33, the left and right positions of the rack 34 in the washing chamber 33 are automatically defined as the proper positions, and as a result, the rack 34 is placed in the washing chamber. It is installed at an appropriate position within 33.

Further, since the magnetic sensor 308 is provided outside the rear surface 31a at a position facing the magnet 307 when the shaft 302 is moved toward the table 81 until it is stopped by the stopper 303, the rack 34 is washed. When installed in the proper position in the chamber 33, the magnetism of the magnet 307 is detected by the magnetic sensor 308 via the back surface 31a. Here, the magnetic sensor 308 includes a lid opening / closing device 7
Since the motor 202 of No. 8 is interlocked to close the lid 32, the electric motor 202 reverses after a certain time lag, and the gear 2 is rotated via the drive shaft 203 and the spur gear 204.
07 rotates in the direction of symbol A in FIG. As a result, the axis 75
7 rotates in the Y direction in FIG. 7, and as the shaft 75 rotates, the lid 32
Automatically starts descending.

When the lid 32 is completely lowered and the cleaning chamber 33 is closed, the reverse rotation of the electric motor 202 is automatically stopped by the action of the micro switch 209a, and the upper end of the second lever 34 is placed on the lower end surface of the lid 32. Is pressed from above and the shaft 302 rotates in the direction of arrow D in FIG. As a result, the first lever 304 changes its direction from the front side of the dishwasher 30 to the upper side, and the first lever 304 moves toward the back side 31a and is removed from the rack side surface 34a. However, since the shaft 302 is pressed toward the table 80 by the action of the spring 309, the first lever 304
When the shaft 302 is removed from the rack side surface 34a, the shaft 302 is fixed to the frame side surface 301b and the stopper 306 as shown in FIG.
Are pulled back toward the table 80 until they come into contact with each other.

When the cleaning chamber 33 is completely closed, the main cleaning pump 39 is operated in response to a signal from a limit switch (not shown) installed on the lid 32, and as a result, the cleaning liquid in the cleaning tank 39 passes through the cleaning pipe 40. The main washing nozzles 36, 36 are sprayed toward the dishes in the rack 34 to wash the dishes. This is the main cleaning process.

In the dishwasher of this embodiment, the power of the hot water heater 46 is turned on at the same time when the main washing process is started.
And the water supply valve 48 is opened, and the water supply source 45
Due to the water pressure in the room, raw water at room temperature is supplied from the water supply source 45 to the water supply pipe 66.
And flows into the hot water heater 47. The inflow of raw water is detected by the flow rate sensor 49, and as a result, the burner 53 can be used.

Simultaneously with the start of the main cleaning process, the fan motor 56 starts blowing air to replace the air in the combustion chamber 51 and the heating chamber 57 with the outside air (pre-purge), and at the same time, the burner 53 ignites a sparkler. Works,
Immediately after the operation of the sparker, the pressure equalizing valve 55 opens and the burner 53
Gas is supplied to the burner 53 and the burner 53 is ignited. The ignition of the burner 53 is detected by the extinguishing safety device 54.

In this case, the amount of air blown by the fan motor 56 is once weakened to about half of that during the pre-purge when the burner 53 is ignited, and thereafter gradually returns to the maximum. This is because by reducing the air flow rate of the fan motor 56,
This is to prevent the wind from the fan motor 56 from interfering with the ignition when the burner 53 is ignited by the sparker. Further, the sparker continues to operate for several seconds after the burner 53 is ignited. This is because the burner 53 may not be reliably ignited if the sparker is operated for a short time. The raw water thus flowing into the heating pipe 58 is heated by the burner 53 in the heating chamber 57 and becomes rinse water of about 85 ° C., which is the tank 63.
Stored in. As a result, the water level in the tank 64 is shown in FIG.
It gradually increases as shown in.

Further, when the main washing process is completed, the water supply valve 48 is closed and the flow of raw water from the water supply source 45 to the hot water heater 46 is stopped. As a result, the flow rate of the raw water in the hot water heater 46 becomes 0, the pressure equalizing valve 55 is closed by the action of the flow rate sensor 49, the gas supply to the burner 53 is stopped, the burner 53 is extinguished, and the heating pipe 58 to the tank 63. The inflow of rinsing water is also stopped.

The amount of air blown by the fan motor 56 decreases to about half of that when the burner 53 burns as the burner 53 extinguishes, and after maintaining that state for a while, reaches 0.
Becomes This is post-purging, and post-purging
The air in the combustion chamber 51 and the heating chamber 57 is exchanged with the outside air.

On the other hand, by the operation of the opening / closing control means, the automatic opening / closing valve 42 is opened corresponding to the rest time after the end of the main cleaning process. As a result, in particular, the cleaning liquid around the bottom of the cleaning tank 38 is discharged from the opening 41 to the filter 43 by gravity, and only the residue is filtered off in the filter 43. When the rest time ends, the automatic opening / closing valve 42 is returned to the closed state by the action of the opening / closing control means, and the discharge of the cleaning liquid from the cleaning tank 38 to the filter 43 is stopped. The discharge amount of the cleaning liquid through the opening of the opening 41 is equal to the inflow amount of rinse water accompanying the rinsing process, which will be described later, so that the water level in the cleaning tank 38 is always kept constant. Also, the filter 43
Discard the residue that has been filtered in.

Next, the rinsing pump 66 is operated and the high temperature rinsing water stored in the tank 63 is rinsed by the rinsing pump 65.
The pressure is applied to rinse the dishes from the rinsing nozzles 37, 37 to rinse the dishes. This is the rinsing process. As a result of the rinsing process, the rinsing water in the tank 63 rapidly decreases, and the water level of the rinsing water in the tank 63 drops to the same level as before the start of the main cleaning process at the end of the rinsing process.

Then, the tableware is automatically washed by repeating the main washing process and the rinsing process at regular intervals with a rest period. The main cleaning nozzles 36, 3
6 and the rinsing nozzle 37, 37
All of the rinse water sprayed from the tank flows into the cleaning tank 38 and is used again in the main cleaning process by the action of the main cleaning pump 39.

On the other hand, in the rinsing stroke, the rinsing pump 6
A part of the rinse water discharged from 5 flows from the branch 68 through the pipe 69 into the outer container 100 of the detergent pump 67b from the nozzle 104. Then, the pressure in the outer container 100 increases due to the inflow of rinse water into the outer container 100, and accordingly, the bellows 106 of the inner container 107 contracts in its axial direction, so that the inner container 107 is returned to its original position (see FIG. 3).
3) to the position indicated by reference numeral E in FIG. 3, for example.

In the main cleaning process, the flow of rinse water from the pipe 69 into the outer container 100 is stopped, and the pressure in the outer container 100 is reduced. As a result, bellows 1
06 extends in the axial direction, and the inner container 107 expands from the contracted position to the original position. Then, the inner container 107
When the check valve 114 is opened, the detergent in the detergent tank 67a causes the detergent in the detergent pump 67b to be opened. And then flows into the inner container 107.

When the rinsing process is restarted, a part of the rinsing water discharged from the rinsing pump 65 again flows into the outer container 100 via the pipe 69, and the pressure in the outer container 100 increases accordingly. The bellows 106 contracts again in its axial direction, and the inner container 107 contracts. As a result, the check valve 114 is closed, and the detergent in the inner container 107 is sent from the solution sending port 111 through the nozzle 115 to the hose 67c. Since the end of the hose 67c opens on the surface of the cleaning liquid in the cleaning tank 38, the detergent is supplied to the cleaning tank 38.

In this case, the amount of detergent supplied by contraction of the inner container 107 can be arbitrarily determined according to the amount of protrusion of the tip of the detergent supply amount adjusting screw 102 into the outer container 100. That is, the detergent supply amount adjusting screw 102 is rotated,
When the amount of protrusion of the tip of the screw 102 for adjusting the detergent supply amount into the outer container 100 is increased, the contraction amount of the inner container 107 is reduced, and as a result, the supply amount of the detergent is reduced.

The series of operations described above are continuously performed during the operation of the dishwasher 30, so that a certain amount of detergent is supplied from the detergent supply device 67 to the cleaning tank 38 for each rinsing stroke. As a result, the concentration of the detergent in the cleaning tank 38 is prevented from being lowered due to the inflow of the rinse water, and the concentration of the detergent in the cleaning tank 38 is always kept constant.

After the washing is completed, the operator lifts the first arm 74 to open the lid 32 again, and again moves the rack 34 on which the washed dishes are mounted in the arrow direction in FIG. Move to 83. Then, the first lever 304, which was previously supported by the back surface of the rack 34 in the state of facing upward, faces the front surface side of the dishwasher 30 due to the weight of the first lever 304. As a result, the rack stopper 79 returns to the state shown in FIG. 8 again, and a new rack 34 can be installed in the cleaning chamber 33.

On the other hand, when the electric motor 202 is turned off and the first arm 74 is moved up and down, the shaft 75 rotates, and its rotation passes through the gear 207 and the spur gear 204 and the drive shaft 20.
3 is transmitted to the drive shaft 203, the drive shaft 203 spins idle, and the lid 3
2 opens and closes. Therefore, in this lid opening / closing device 78, the lid 3
It is possible to open and close 2 manually. Drive shaft 203
A clutch is interposed between the spur gear 204 and the spur gear 204, and when the lid 32 is opened and closed manually, the clutch is disengaged in advance to remove the load caused by the idling of the drive shaft 203, and to open and close the lid 32 manually. It can also be easy.

The main cleaning pump 39 and the rinsing pump 6
5 and the operating time of the hot water heater 46 are both controlled by a control means (not shown) using, for example, a sequencer. In addition, in the case of this embodiment, the main cleaning process, the rest time, and the rinsing process required time of 50 seconds and 5 respectively.
Seconds and 10 seconds.

By the way, generally, in the cleaning tank 38,
The closer the cleaning liquid is to the liquid surface, the higher the activity is, and the cleaning liquid that has become dirty and has decreased activity tends to accumulate at the bottom. However, in the dishwasher 30 shown in this embodiment, the cleaning liquid has an opening provided at the bottom of the cleaning tank 38. Since it is discharged from the portion 41, the discharged cleaning liquid is mainly a cleaning liquid with reduced activity. Therefore,
In the cleaning tank 38, a clean and highly active cleaning liquid is supplied from above, and a cleaning liquid which has become dirty and has reduced activity is discharged from the bottom, and as a result, the cleaning liquid is sufficiently purified and renewed, and the cleaning liquid Activity decline is prevented.

Moreover, the strainer 4 for filtering out the residue in the cleaning liquid
Since 3 is provided at the end of the automatic opening / closing valve 42, the residue accumulated in the filter 43 is separated from the cleaning solution in the cleaning tank 38, and as a result, the activity of the cleaning solution is lowered due to a chemical reaction caused by contact with the residue. Is prevented.

Further, since the detergent pump 67b is driven by the pressure of the rinsing water, the drive source dedicated to the detergent pump 67b is unnecessary. Therefore, the manufacturing cost and running cost of the detergent supply device 67 are reduced, and the detergent pump 6
It is possible to significantly reduce the size of 7b. As a result, the amount of materials used for the parts of the detergent pump 67b is reduced, and since the resin is used as the material of the internal container 107 which is a main part of the detergent pump 67b, the above manufacturing cost is further reduced. . Moreover, since the detergent supply device 67 does not use electricity, it is not necessary to waterproof the detergent supply device 67.

Further, since the high-temperature rinse water constantly flows in and out in the outer container 100, the detergent that has flowed into the inner container 107 at the end of the rinsing process is the wall surface of the inner container 107 during the main cleaning process. Heat is automatically exchanged with the rinsing water via the water, and in the next rinsing step, the rinsing water is preheated to almost the same temperature as the rinsing water and supplied to the cleaning tank 38. Therefore, regardless of whether the room temperature is high or low, the detergent is always supplied to the cleaning tank 38 while maintaining a high activity.

Moreover, since the opening 41 is opened only during the rest time provided between the main cleaning process and the rinsing process by the action of the opening / closing control means, the detergent supply device 6
The supply of the detergent by 7 is always performed after the used cleaning liquid in the previous main cleaning process is discharged by opening the opening 41. As a result, in the next main cleaning process, the highly active detergent newly supplied from the detergent supply device 67 is mainly used after the rest time, and more effective cleaning becomes possible.

The detergent pump 67b has a support plate 108.
For example, it may be fixed to the bottom of the detergent tank 67a, or may be thrown into the detergent tank 67a with the pipe 69 and the hose 67c connected.

On the other hand, since the dish washer 30 of the above embodiment is provided with the rack stopper 79, the left and right positions of the rack 34 in the washing chamber 33 can be extremely easily and reliably positioned. As a result, damage to the rack 34 or tableware in the rack 34 due to a defective installation position of the rack 34 in the cleaning chamber 33 is prevented.

Further, by installing the lid opening / closing device 78, the lid 32
Since the opening / closing of the first arm 74 is automated and the lowering stroke of the lid 32 is interlocked with the rack stopper 79, it is not necessary to lower the first arm 74, and the operation of the dishwasher 30 is saved. Moreover, the magnet 307 and the magnetic sensor 30
8, the descending stroke control is performed via the back surface 31a, so that it is not necessary to directly install the sensor in the cleaning chamber 33 where a large amount of water is used, and leakage of electricity or failure due to adhesion of water to the sensor, etc. No worries.

Moreover, the lid opening / closing device 78 installed in the dishwasher 30 of the above-described embodiment allows the lid 32 to be opened / closed manually even when the lid opening / closing device 78 is installed, and the installation space is small. It can be small. It also has an effect that it can be easily attached to and detached from the dishwasher 30.

[0086]

As described above, in the dishwasher of the present invention, since the opening portion is provided at the bottom of the washing tank, when the excess washing liquid is discharged out of the circulation system of the washing liquid, the washing tank is washed. The less active cleaning liquid that collects at the bottom of the tank is discharged preferentially and automatically. Therefore, it is possible to surely carry out the cleaning and renewal of the cleaning liquid by the inflow of the rinse liquid into the cleaning tank during the rinsing process. Further, since the filter for filtering the residue in the cleaning solution is provided in the flow path of the cleaning solution flowing out from the opening, the activity of the cleaning solution is prevented from being lowered due to the contact with the residue.

Further, since the detergent pump for supplying the detergent to the cleaning tank is driven by the pressure of the rinsing liquid fed from the rinsing pump piping system, the drive source dedicated to the detergent pump is unnecessary and the manufacturing cost is reduced. And running costs are reduced. Moreover, since the detergent pump can be significantly downsized, the amount of materials used as parts is reduced, and the manufacturing cost is further reduced. On the other hand, since the detergent is heated by heat exchange between the detergent and the rinse liquid in the detergent pump, the activity of the cleaning liquid is always maintained at a high level.

Furthermore, since the opening is opened between the main cleaning process and the rinsing process, the detergent pump is always used to supply the detergent so that the used cleaning liquid is always used. Only after being discharged. as a result,
In the next main cleaning step, the highly active detergent newly supplied from the detergent supply device is mainly used, and more effective cleaning can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a dishwasher according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of the structure of a hot water heater used in the first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a detergent pump showing an example of the structure of the detergent pump used in the first embodiment of the present invention.

FIG. 4 is a top perspective view showing an example of mounting the lid opening / closing device used in the first embodiment of the present invention on a dishwasher.

FIG. 5 is a side view showing an example of the structure of the lid opening / closing device used in the first embodiment of the present invention.

FIG. 6 is an arrow view from the VI direction showing an example of the structure of the lid opening / closing device used in the first embodiment of the present invention.

FIG. 7 is a view from the VII direction showing an example of the structure of the lid opening / closing device used in the first embodiment of the present invention.

FIG. 8 is a view showing a structure of a rack stopper used in the first embodiment of the present invention.

FIG. 9 is a diagram showing a usage state of the dishwasher according to the first embodiment of the present invention.

FIG. 10 is a diagram showing an operating state of the rack stopper used in the first embodiment of the present invention.

FIG. 11 is a view showing an operating state of the rack stopper used in the first embodiment of the present invention.

FIG. 12 is a timing chart showing the operating conditions of the dishwasher according to the first embodiment of the present invention over time.

FIG. 13 is a diagram showing a usage state of a conventional dishwasher.

FIG. 14 is a diagram showing an example of the structure of a conventional dishwasher.

[Explanation of symbols]

 1,30 Dishwasher 2,33 Washing room 3,32 Lid 4 Dish 5,34 Rack 6,35 Guide rail 7,8,80,81 Table 9,82 Water tank 10,38 Wash tank 11,36 Main washing nozzle 12 , 39 Main washing pump 13 Water heater 14 Booster 15,65 Rinse pump 16,37 Rinse nozzle 17,69 Pipe line 18,67 Detergent supply device 18a, 67a Detergent tank 18b, 67b Detergent pump 18c, 67c Hose 19 Drainage channel 19a Upper end of drainage channel 20,43 Filter 31,47 Container 31a Rear of container 34a Side of rack 40 Cleaning pipe 41 Opening 42 Automatic opening / closing valve 44 Waste water tank 45 Water supply source 46 Hot water heater 48 Water supply valve 49 Flow rate sensor 50,62 Thermistor 51 Combustion chamber 52 Ceramic blade 53 Burner 54 Disappearance safety device 55 rod equalizer valve 56 fan motor 57 heating chamber 58 heating tube 59 temperature fuse 60 antifreeze heater 61 boiling prevention device 63 tank 64 float switch 66 water supply pipe 68 branch 74 first arm 75, 302 shaft 76 second arm 77 , 309 Spring 78 Lid opening / closing device 79 Rack stopper 83 Rail 100 External container 101 Upper lid 102 Supply amount adjusting screw 103 Rinsing water supply port 104, 115 Nozzle 105, 108a Through hole 106 Bellows 107 Inner container 107a Tip of inner container 108 Support plate 109 O-ring 110 Tip member 110a Male screw part 110b Flange part 110c Detergent supply port 111 Liquid delivery port 112 Steel ball 113 Screw 114 Check valve 201, 301 Frame 201a Mounting part 202 Electric motor 203 drive shaft 204 spur gear 205 bearing member 206 recess 207 gear 208 mounting member 209a, 209b micro switch 210 disk-shaped member 301a, 301b frame side surface 303, 306 stopper 304 first lever 305 second lever 307 magnet 308 magnetic sensor A One end of the gear of the lid opening / closing device B Another end of the gear of the lid opening / closing device C Moving amount of the shaft of the rack stopper D Rotating direction of the shaft of the rack stopper E Position when the internal container of the detergent pump is contracted

Claims (4)

[Claims] 1. A rack containing a cleaning object is installed in a cleaning chamber that is opened and closed by a lid that moves up and down, and a cleaning liquid in a cleaning tank formed below the cleaning chamber is circulated by a main cleaning pump. The main cleaning process of spraying from the cleaning nozzle toward the cleaning target, and the rinse water obtained by heating the raw water supplied from the water supply source by the heating means is directed from the rinse nozzle toward the cleaning target by the pressure of the rinse pump. In a dishwasher that performs a rinsing process of spraying, an opening / closing opening is formed at the bottom of the cleaning tank, and a detergent tank containing a detergent and the detergent in a space isolated from the cleaning tank. A detergent pump for supplying detergent from a tank to the cleaning tank is provided, and the detergent pump is a member that is deformed by a pressure supplied from a piping system of the rinse pump. Dishwasher and supplying the detergent tank into the cleaning tank. 2. The dishwasher according to claim 1, wherein a filter for filtering the residue in the cleaning liquid is provided in the flow path of the cleaning liquid flowing out from the opening. 3. The dishwasher according to claim 1, further comprising opening / closing control means provided between the main washing process and the rinsing process to open the opening. 4. The dishwasher according to claim 1, wherein the detergent pump is a variable discharge type pump.