JPH09108162A - dishwasher - Google Patents

Abstract

(57) Abstract: To maintain and improve the reliability of a water level detecting device for detecting a plurality of water levels in a dishwasher for washing dishes by accumulating washing water in a washing tank, and to reduce costs. SOLUTION: A water level detection device 31 detects a plurality of water levels in a cleaning tank that stores dishes and stores cleaning water. The water level detection device 31 includes a cleaning side switch 33 that detects the water level by moving the magnet 43 away from the cleaning side float 35 that moves up and down in conjunction with the water level in the cleaning tank, and an overflow side that detects the water level by approaching the magnet 44. It is composed of a switch 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes by storing washing water in a washing tank.

[0002]

2. Description of the Related Art Conventionally, this type of dishwasher has been constructed as shown in FIGS. Hereinafter, the configuration will be described.

As shown in FIG. 4, the washing tank 1 is provided with dishes 2
The basket 3 is stored through the basket 3 and the cleaning water is stored at the bottom.
The cleaning nozzle 4 is rotatably supported in the center of the bottom of the cleaning tank 1 and ejects the cleaning water sent from the cleaning pump 5 toward the tableware 2. The heater 6 is arranged at the bottom of the cleaning tank 1 to heat the cleaning water. The water supply valve 7 is attached to the back surface of the cleaning tank 1 and supplies tap water into the cleaning tank 1 via a water supply pipe 8. The underframe 9 supports the cleaning tank 1. Auxiliary water tank 10
Guides the cleaning water collected at the bottom of the cleaning tank 1 to the water level detection device 12 via the hose 11.

The water level detecting device 12 is, as shown in FIG.
It is composed of a wash water level detector 13 and an overflow water level detector 14,
The cleaning water level detection unit 13 detects the water level of the cleaning tank 1 in order to store a specified amount of cleaning water required for cleaning in the cleaning tank 1.
The overflow detection unit 14 detects an abnormality so that the water flowing into the cleaning tank 1 does not overflow, such as when the water supply valve 7 fails, and operates a drain pump (not shown).

The cleaning side float 15 moves up and down along with the water level in the auxiliary water tank 10 along the guide hole 17 of the mounting plate 16, and the cleaning side float 15 is hung on a lever 18 rotatably supported by the mounting plate 16. Has been done. The switch portion 20 of the micro switch 19 is held by the holding portion 21 of the lever 18. The overflow side float 22 is the auxiliary mounting plate 2
A magnet 26 is provided above the guide holes 24 and 25 of FIG. 3, and a reed switch 27 is molded and held in a case 28 so as to face the magnet 26.

To explain the operation of the above structure, when the user arranges the dishes 2 in the basket 3 and stores them in the washing tank 1 and puts the detergent and then starts the operation, the water supply valve 7 operates and the washing tank 1 Tap water is supplied inside. The tap water collects at the bottom of the cleaning tank 1 and the auxiliary water tank 10 via the hose 11.
It is led to. When the washing side float 15 is submerged in water as the water level rises, it floats up and pushes up the lever 18. As a result, the holding portion 21 that was pushing the switch portion 20 of the micro switch 19 separates, and the contact switches from on to off. The control device (not shown) detects that it has reached the cleaning water level and stops the water supply valve 7,
The washing pump 5 is operated to move to the washing step.

In the case of an abnormality in which foreign matter is caught in the water supply valve 7 and the inflow of water from the water supply valve 7 into the cleaning tank 1 is not stopped, the front surface of the cleaning tank 1 is exceeded by exceeding the cleaning water level. To prevent water from leaking out of the machine from 29, the overflow detection unit 14
It detects the overflow water level before it leaks and informs the user of the abnormality by notifying it and also operates a drain pump (not shown) to prevent leakage to the outside.

In this overflow detection, the magnet 26 provided on the overflow side float 22 approaches the reed switch 27 as the overflow side float 22 floats up due to the rise of the water level, and as a result, the contact is switched from off to on and the dishwasher main body is turned on. The controller determines that there is an overflow.

The reason why the switches on the cleaning side and the overflow side are different from each other is to prevent the failure in the same mode and to consider the reliability so that one of the worst functions.

[0010]

In such a conventional structure, separate switches are provided for the washing side and the overflow side, and accordingly, the shape and mechanism of the float must be separately provided according to the switches. The cost was high in terms of manufacturing parts management and economies of scale.

In particular, since the micro switch 19 is used, the pushing force of the switch portion 20 is required, and therefore, the mechanical consideration such as increasing the buoyancy of the overflow side float 22 through the lever 18 is required. At the same time as the cost increased, there was concern that the reliability would decrease due to the increase in the number of mechanical parts.

The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to maintain the reliability of a water level detection device for detecting a plurality of water levels and to reduce the cost.

[0013]

In the dishwasher of the present invention, a water level detecting device for detecting a plurality of water levels in a cleaning tank for storing dishes and storing cleaning water is interlocked with the water level of the cleaning tank. A plurality of floats that move up and down, a first detection unit that detects the water level by the distance of the driver due to the rise of the float, and a second detector that detects the water level by the approach of the driver
And a detection means of.

As a result, the reliability of the water level detecting device for detecting a plurality of water levels can be maintained and the cost can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a cleaning tank for storing dishes and storing cleaning water, and a water level detecting device for detecting a plurality of water levels in the cleaning tank. The water level detection device includes a plurality of floats that move up and down in conjunction with the water level of the cleaning tank, a first detection unit that detects the water level by the distance of the driver due to the rise of the float, and the approach of the driver. The first detecting means is configured by a second detecting means for detecting the water level, and the output of the first detecting means changes from on to off or from high to low due to the rise of the float, and the second detecting means is A rise changes its output from off to on or from low to high. Therefore, since the first detection means and the second detection means have the same configuration and different detection modes, it is possible to maintain reliability and reduce cost.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the driver element is composed of a magnet held on a float, and the first and second detecting means are arranged close to the magnet. A reed switch whose contacts are closed by means of a reed switch, each of which has a switch case that supports the reed switch. The first detection means attaches the switch case to face the float, and the second detection means attaches the switch case. Is attached upside down and is attached so as to face the float. Using the same reed switch, the first detection means is normally used in the ON state and used in the OFF state during operation, and the second detection means is used. Can be used in the off state at normal times and on at the time of operation, and since it will be used in different modes, reliability can be maintained and levers etc. Without the use of 構部 component, the cost can be reduced by only by a simple structure vertical movement of the float.

According to a third aspect of the present invention, in the invention according to the second aspect, the switch case includes a connector for extracting a contact signal of the reed switch, and the second detecting means detects a high water level. By providing the connector in the switch case, the reliability can be improved, and the switch case is turned upside down to detect the high water level by the second detecting means attached facing the float. Therefore, the mounting position of the second detecting means is high, and the lead wire can be easily connected even if the connector is located below the switch case.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment) As shown in FIG. 1 and FIG. 2, an auxiliary water tank 30 guides water accumulated in the cleaning tank 1 from the cleaning tank 1 through a hose 11, and a water level detecting device above the water. 31 is attached. The mounting plate 32 is the auxiliary water tank 3
It is provided so as to cover 0, holds the washing side switch (first detecting means) 33 and the overflow side switch 34 (second detecting means), and moves the washing side float 35 and the overflow side float 36 up and down. Guide portions 37, 38, 39, 40 for guiding are provided.

Washing side float 35 and overflow side float 36
Magnets (drivers) 43, 4 above the guide rods 41, 42 of
4, the washing side switch 33 and the overflow side switch 34 are provided inside the switch cases 45 and 46, respectively.
7, 48 are molded and held. Further, the washing side switch 33 and the overflow side switch 34 are connected to the connectors 49, 50.
And the cleaning side switch 33 is the reed switch 4
7 is held on the mounting plate 32 so that the reed switch 48 is on the mounting plate 32 so that the reed switch 48 is on the lower side.

The operation of the above configuration will be described. The state of FIG. 1 shows a state in which there is no water in the auxiliary water tank 30, and the magnet 43 of the cleaning side float 35 is in contact with the reed switch 47. 47 is on. Further, since the magnet 44 of the overflow side float 36 is in contact with the stopper portion 51 of the mounting plate 32, and the reed switch 48 is separated from the magnet 44, it is in an off state.

The reed switches 47 and 48 are magnets 43 and 4,
When 4 comes closer and the distance is 4 mm, the contact changes from the off state to the on state. On the contrary, due to the hysteresis, the contact is changed from the ON state to the OFF state when the distance from the reed switch is 4.5 mm in the direction in which the magnets 43 and 44 move away from each other.

When the operation of the dishwasher is started, tap water is supplied from the water supply valve 7 into the washing tank 1 and the auxiliary water tank 30 also begins to collect water. Float 3 on the washing side due to rising water level
5 soaks in water and begins to float. As shown in FIG. 3, when the water level reaches the cleaning water level P1, the reed switch 47 and the magnet 4 are released.
The distance a to 3 becomes 4.5 mm, and the reed switch 47
Changes from the on state to the off state, and the control device (not shown) of the dishwasher body detects this and determines that the water level has reached the wash water level and moves to the next wash step.

When the water supply valve 7 fails and an abnormality occurs in which the inflow of water into the cleaning tank 1 does not stop, the water level in the auxiliary water tank 30 reaches the overflow water level P2 and the overflow side float 36 Is lifted and the distance b between the reed switch 48 and the magnet 44 becomes 4 mm, and the contact of the reed switch 48 changes from the off state to the on state. This can be notified and a drain pump (not shown) can be operated to prevent water leakage from the cleaning tank 1 to the outside of the machine.

Cleaning side switch 33 and overflow side switch 34
Uses the same switch, but the operating mode of the contacts is reversed, so the probability that both switches will malfunction in the same failure mode is low, improving reliability and at the same time the float is the same. Since it is possible to use one, it is possible to provide an extremely inexpensive water level detection device.

Further, the detection of the cleaning side float 35 is performed by the magnet 4
3 is separated, and the overflow-side float 36 is detected by the approach of the magnet 44. Therefore, the connector 50 of the overflow-side switch 34 faces downward, but the distance from the mounting plate 32 is large, so The connection workability can be improved.

[0027]

As described above, according to the invention described in claim 1 of the present invention, a cleaning tank for storing dishes and storing cleaning water, and a water level detecting device for detecting a plurality of water levels in the cleaning tank The water level detection device includes a plurality of floats that move up and down in conjunction with the water level of the cleaning tank, a first detection unit that detects the water level by the distance of the driver caused by the rise of the float, and the drive. Since the second detection means for detecting the water level by the approach of the child is used, the first detection means and the second detection means have the same configuration and different detection modes.
The reliability can be maintained and the cost can be reduced.

According to the second aspect of the invention, the driver element is composed of a magnet held in a float, and the first and second detecting means are composed of reed switches whose contacts are closed by the approach of the magnet. And a switch case supporting each of the reed switches, and the first detection means attaches the switch case so as to face the float,
Since the second detecting means is constructed by turning the switch case upside down and attaching it so as to face the float, the same detecting means is used, and the first detecting means is used in the ON state in the normal state and in the OFF state in the operation. However, since the second detecting means can be used in an off state in a normal state and in an on state during operation, and is used in different modes, reliability can be maintained and a mechanical portion such as a lever can be maintained. The cost can be reduced by a simple structure that only the float moves up and down without using it.

According to the third aspect of the present invention, the switch case is provided with the connector for taking out the contact signal of the reed switch, and the second detecting means detects the high water level. By providing the case, the reliability can be improved, the mounting position of the second detecting means is high, and the lead wire can be easily connected even when the connector is below the switch case.

[Brief description of the drawings]

FIG. 1 is a sectional view of a water level detection device for a dishwasher according to an embodiment of the present invention.

FIG. 2 is a sectional view of a dishwasher equipped with the same water level detection device.

FIG. 3 is a cross-sectional view showing the position of the water level detection device of the dishwasher when detecting the water level.

FIG. 4 is a cross-sectional view of a conventional dishwasher

FIG. 5 is a sectional view of the water level detection device of the dishwasher.

[Explanation of symbols]

 1 Cleaning Tank 2 Tableware 30 Auxiliary Water Tank 31 Water Level Detection Device 33 Cleaning Side Switch (First Detection Means) 34 Overflow Side Switch (Second Detection Means) 35 Cleaning Side Float (Float) 36 Overflow Side Float (Float) 43 Magnet (driver) 44 Magnet (driver)

Claims (3)

[Claims] 1. A cleaning tank for accommodating dishes and storing cleaning water, and a water level detecting device for detecting a plurality of water levels in the cleaning tank, wherein the water level detecting device is interlocked with the water level of the cleaning tank. Dishwasher composed of a plurality of floats that vertically move up and down, first detecting means for detecting the water level by the distance of the driver due to the rise of the float, and second detecting means for detecting the water level by the approach of the driver. Machine. 2. A switch case for supporting the reed switch, wherein the driver is composed of a magnet held in a float, and the first and second detection means are composed of reed switches whose contacts are closed when the magnets approach each other. The first detection means is configured to attach the switch case so as to face the float, and the second detection means is configured to turn the switch case upside down and be attached so as to face the float. The listed dishwasher. 3. The dishwasher according to claim 2, wherein the switch case has a connector for taking out a contact signal of the reed switch, and the second detection means detects a high water level.