KR0140597B1 - Water level detector for dish washer - Google Patents

Abstract

The present invention relates to a water level sensing device for sensing at least two levels of water, comprising: a floater capable of moving up and down by buoyancy according to the level of a reservoir to be measured, a guide for guiding the shangdong of the plotter, and a connection to the plotter And a lifting body which moves up and down integrally, a rod-shaped link fixedly rotatable to the free end of the lifting body, a slider provided at the free end of the link, a slider rail for guiding the slider in a substantially horizontal direction, and a slider rail. And a plurality of sensing switches which are sequentially installed along the moving direction of the slider and are in contact with each other by the slider. As a result, a water level sensing device capable of high-level step-level control with a simple structure is provided.

Description

Water level detector for dish washer

1 is a cross-sectional view of an example of a conventional water level sensor,

2 is a cross-sectional view of another example of a conventional water level sensor,

3 is a schematic cross-sectional view of the dishwasher,

4 is a cross-sectional view showing a state before the operation of the water level sensor according to the present invention,

5 is a cross-sectional view showing the proper level detection state,

6 is a cross-sectional view showing an abnormal water level detection state.

* Explanation of symbols for main parts of the drawings

1: housing 2: cleaning bath

3: lower basket 4: upper basket

5, 6: upper and lower nozzles 7: washing water pump

8: water line 9: drain pump

10: casing 11: guide

12: guide hole 13: slider rails

15: micro switch 16: button

18: micro switch 19: button

20: plotter 21: air chamber

23: lifting bar 24: rotating pin

25: Link 26: Roller Pin

27: sliding roller

The present invention relates to a level washing device for a dish washer for sensing the level of the washing tank at least two stages.

The water level detection device, especially the water level detection device for a dishwasher, has a water level detection switch which operates in conjunction with the water level in order to control the amount of water supplied to the water reservoir, that is, the washing tank.

1 is a cross-sectional view showing an example of a conventional water level detecting device (Japanese Patent Application No. 51-145764). The conventional water level sensor is a floater 102 installed in the lower region inside the washing tank 101, and a lifting body 103 and a lifting body 103 which are lifted by the plotter 102 and protrude outside the washing tank 101. The micro switch 104 is operated on and off through the operation lever 105 by the lifting and lowering of the 103. As a result, the floater 102 moves up and down in accordance with the water level in the washing tank 101, so that the micro switch 104 is turned on and off to adjust the water level.

However, this conventional example has a problem that only a suitable level can be sensed by a single switch, so that in case of failure or malfunction of the single switch, proper level control is impossible. Since the switch is operated by the weight of the floater and the lifting body, the weight must be relatively large.

2 is a cross-sectional view showing another example of a conventional water level sensor. As can be seen in this figure, the conventional water level sensing device has a water level sensing chamber 50 that is connected to the bottom of the washing tank 2 through the conduit 53, the water supply of the washing tank 2 can be introduced. The water level detection chamber 50 is connected to an air chamber (not shown) through the air conduit 51 at the top thereof, and the inflow and outflow of air is possible, and the air conduit 51 has an extension portion 52 of the water level detection chamber 50. It is down to a considerable length inside. In the upper part of the water level detection chamber 50, a pair of sensing switches 55 and 57 are also provided which are respectively connected via the air tubes 56 and 58, respectively. One of these sensing switches 55 is an appropriate level sensing switch operating at a relatively low pressure, and the other 57 is an abnormal level sensing switch operating at a relatively high pressure.

In the conventional water level sensing device, when water is supplied into the washing tank 2, the washing water flows into the water level sensing chamber 50 through the conduit 53, and the air in the air chamber is compressed by the introduced water. The air in the water level detection chamber 50 is also compressed. When the water introduced into the water level detection chamber 50 reaches the appropriate water level (A), the proper water level detection switch 55 is operated to correspond to the pressure to block the water supply to the washing tank (2). Here, when the proper level detection switch 55 does not operate normally due to a failure or the like, water continues to flow in to further compress the air in the water level sensing chamber 50. When the pressure of the air reaches a pressure corresponding to the preset abnormal level, the abnormal level detecting switch 57 operates to stop the water supply.

However, such a conventional water level detection device has a large range of detection errors because the detection switches operate based on the pressure of air, which is a pressurized fluid, so that they may operate simultaneously within an error range. In order to prevent this, there is a problem in that the range between the proper level and the abnormal level is unnecessarily wide. In addition, since the water level sensing chamber has a relatively large air pressure forming space, there is a disadvantage that the overall volume of the apparatus is large.

Accordingly, an object of the present invention is to provide a miniaturized water level sensing device capable of appropriately utilizing the free space of the dishwasher while minimizing the error range between each step in detecting the water level in a plurality of stages. To provide.

The object of the present invention is to have a floater capable of lifting and lowering by buoyancy according to the water level in the washing tank, a guide for guiding the lifting movement of the plotter, and a lifting body connected to the plotter and moving up and down integrally, at least A water level detecting device for a dish washer for sensing the level of a washing tank in two stages, comprising: a bar link fixed to a free end of the lifting body rotatably, a slider provided at the free end of the link, and the slider almost horizontally And a plurality of sensing switches which are sequentially installed along the moving direction of the slider adjacent to the slider rail and are in contact with the slider rail. .

Here, the slider may be composed of a roller rotatably installed at the free end of the link to obtain a smooth operation, the sensing switch can be simply configured as a button-actuated micro switch. The space can be reduced by placing the plotter inside the washing tank.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic cross-sectional view of the dishwasher. The dishwasher has an outer housing (1) and a washing tank (2) installed therein, and the washing tank (2) is provided with a lower basket (3) and an upper basket (4) for supporting the dishes, and at the same time The lower nozzle 5 and the upper nozzle 6 for injection, and the washing pump 7 for supplying washing water to these nozzles 5 and 6 are provided. The washing pump 7 pumps the washing water when the washing water is supplied into the washing tank 2 through the water supply pipe 8 and feeds the washing water to the water spray nozzles 5 and 6. After washing, the washing water is drained by a drain pump.

4 is a cross-sectional view of the level sensor according to the present invention. As can be seen from this figure, the water level sensing device has a plotter 20 mounted to the guide 11 protruding upward from the casing 10 forming a region of the bottom of the washing tank. . Plotter 20 is located in the washing tank is guided by the guide 11 in accordance with the amount of washing in the washing tank to move. The inside of the plotter 2 is empty to form an air chamber 21 for buoyancy.

The plotter 20 is integrally connected to a lifting bar 23 which can be lifted and lowered in a guide hole 12 formed in the guide 11 in a vertical direction. Accordingly, the lifting bar 23 is lifted in conjunction with the lifting movement of the plotter 20. A link 25 on the rod is inclined with respect to the moving direction of the lifting bar 23 so as to be able to rotate relative to the free end of the lifting bar 23 via the rotation pin 24. In addition, sliding rollers 27 are provided at the free ends of the links 25 via roller pins 26, respectively, and the sliding rollers 27 are placed horizontally in the lifting direction of the lifting bar 23, that is, in the horizontal direction. A slider rail 13 for guiding linear movement is fixed. Accordingly, in conjunction with the lifting motion of the lifting bar 23 together with the plotter 20, the sliding roller 27 is in the horizontal direction by the action of the link 25 and the slider rail 13, respectively. .

The slider rails 13 are also provided with microswitches 15 and 18 side by side in the longitudinal direction thereof, that is, along the moving direction of each sliding roller 27. The operation buttons 16 and 19 of each of the micro switches 15 and 18 protrude toward the movement path of the sliding roller 27, so that each switch is selectively operated according to the movement degree of the roller 27.

By this configuration, before the washing water is supplied into the washing tank 2, as shown in FIG. 4, the plotter 20 is positioned at the bottom and thus each roller 27 is left on the drawing of the slider rail 13. Neither switch 15 nor 18 shall be actuated.

As the washing water is supplied into the washing tank 2 and the amount of water increases, the plotter 20 rises, and the roller 27 moves along the slider rails 13. When the amount of the washing water in the washing tank 2 reaches the proper level, as shown in FIG. 5, the button 16 of the first appropriate level microswitch 15 provided at the corresponding position is slid to the sliding roller ( 27) is pressed to activate. In accordance with the operation of the switch 15, the control unit not shown cuts off the water supply into the washing tank 2.

If the water supply is not blocked by the failure of the micro switch 15 for proper water level, the washing water in the washing tank 2 continues to increase, so that the rise of the plotter 20 and the movement of the sliding roller 27 also continue. do. When the amount of the washing water in the washing tank 2 reaches the abnormal level, the button 19 of the second abnormal level microswitch 18 provided at the position corresponding thereto is moved as shown in FIG. 27) is pressed to activate. According to the operation of the switch 18, the control unit (not shown) recognizes that the abnormal water level and cuts off the water supply into the washing tank (2).

In the above-described and illustrated embodiments, the case where the water level detecting device according to the present invention is applied to the dishwasher to detect the proper water level and the abnormal water level has been described. However, the water level detecting device is not limited thereto, but a plurality of sensing switches may be used. Of course, it can be applied to all equipment and equipment that need to be installed to detect the multi-level water level.

As described above, according to the present invention, there is provided a level sensing device capable of high-level step-level control with a simple structure.

Claims (2)

A floater capable of lifting and lowering by buoyancy according to the level of the washing tank, a guide for guiding the lifting movement of the plotter, and a lifting body connected to the plotter and lifting and lowering integrally, for detecting at least two levels of the washing tank. A water level detecting device for a dishwasher, comprising: a rod-shaped link rotatably fixed to a free end of the lifting body, sliders provided at the free end of each link, and a slider rail for guiding each slider in a substantially horizontal direction. And a plurality of sensing switches which are sequentially installed along the moving direction of the slider and adjacent to the slider rails to be in contact with each other by the slider. The water level detecting apparatus according to claim 1, wherein the water level detecting apparatus is a roller rotatably installed at a free end of the link.