JPH0744914B2 - Dishwasher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dishwasher that ejects washing water onto dishware stored in a washing cabinet to wash the dishware. More specifically, the invention relates to circulation of washing water. The present invention relates to a dishwasher equipped with a means for detecting a system abnormality.

[Prior Art] Conventionally, a washing water supply device such as a circulation pump is used to rotate a jet nozzle, and the washing water is jetted from the jet port provided in the jet nozzle to the dishes in the washing cabinet for washing. Washers are well known. An example thereof will be described with reference to FIG.

In the figure, (1) is a washing machine main body, (2) is a washing cabinet provided in the washing machine main body (1), a water supply port (3) is provided in the upper part, and the washing water is circulated in the bottom part. A concave drainage sump (4) having a water supply port (5) for discharging and a drainage port (6) for discharging drainage is provided. (7) is a filter detachably set in the upper opening of the drainage sump (4). Reference numeral (8) is a water supply hose whose one end is connected to the water supply opening (3) through an electromagnetic on-off valve (9), and the other end is extended to the outside of the main body of the washing machine (1) and is connected to a water tap or the like. ing. (10) is a circulation pump connected to the water supply port (5),
The output side is connected to the injection nozzle (12) via a pipe (11) made of rubber, for example. (13) is a plurality of injection ports provided in the injection nozzle (12). (14) is a drain pipe having one end connected to the drain port (6) of the drain pool (4) and is taken out of the washing machine body (1) via a drain pump (15). (16) is an opening provided in the main body of the washing machine (1), (17) is a door for opening and closing the opening (16), (1)
9) is a basket for storing dishes (20), which is designed to be stored in the washing cabinet (2) through the opening (16) along the rail (18) provided in the washing cabinet (2). . Reference numeral (21) is a control panel provided under the door (17) and provided with operation switches and display lamps.

The operation of the conventional dishwasher configured as described above will be described below. First, the electromagnetic opening / closing valve (9) is opened to supply a predetermined amount of cleaning water into the cleaning cabinet (2). The washing water accumulated above the filter (7) can be collected by the circulation pump (1
It is guided to the injection nozzle (12) by the operation of (0), and the injection nozzle (12) is rotated by the water supply from the circulation pump (10) and is rotated from the injection port (13) to the tableware (20) in the basket (19). Spray the wash water to wash the dishes (20). During cleaning, the circulating cleaning water is filtered by the filter (7) to prevent clogging of the circulation pump (10).

After washing for a predetermined time, the circulation pump (10) is stopped and the drainage pump (15) is operated to force the wash water in the drainage sump (4) outside the washer body (1), for example, in the kitchen. Discharge to sink. Then, fresh wash water is supplied again to drive the circulation pump (10) to perform rinsing and discharge the wash water. Finally, the heater (not shown) is energized or hot air is blown into the washing chamber (2) to dry the dishes (19). You may rinse with hot water before drying.

When the dishes (20) have been washed, open the door (17),
After pulling out the basket (19) containing the tableware (20) to the outside, take out the filter (7), discard and clean the residue accumulated in the filter (7), and set it again on the drainage sump (4). To do. In order to prevent the injection pressure of the circulation pump (10) from lowering due to clogging, the residue treatment of the filter (7) usually needs to be performed every cleaning.

[Problems to be Solved by the Invention] According to the conventional dishwasher configured as described above, when the next cleaning is performed without forgetting to clean the filter, the cleaning effect is deteriorated due to the clogging of the filter with the residue. In some cases, the necessary rotation and injection of the injection nozzle cannot be obtained, and the cleaning process may end without performing predetermined cleaning.

The present invention has been made to solve the above problems, and an object thereof is to obtain a dishwasher that can detect clogging of a filter.

[Means for Solving the Problems] A dishwasher according to the present invention includes a jet nozzle for jetting wash water, a filter for filtering wash water jetted from the jet nozzle, and wash water filtered by the filter. In a dishwasher having a drainage sump for storing the water, and a circulation pump for pumping the wash water stored in the drainage sump to the jet nozzle, the pressure of the wash water in the circulation path connecting the drainage sump and the jet nozzle And a notifying means for notifying the clogging of the filter based on the detection value of the pressure detecting means.

Further, a flow rate detecting means for detecting a flow rate of washing water in a circulation path connecting the drainage sump and the injection nozzle, and an informing means for notifying a clogging of the filter based on a detection value of the flow rate detecting means. Is.

[Operation] When the circulating water amount of wash water due to filter clogging decreases, the detected value of the wash water pressure detection means or flow rate detection means changes, and the notification means operates in response to this change, resulting in filter clogging. Let me know.

Therefore, the filter can always be kept clean without clogging, and it is possible to prevent deterioration of the cleaning effect and occurrence of an uncleanable state.

[Embodiment of the Invention] FIG. 1 is a front view showing an essential part of an embodiment of the present invention. Note that the same or corresponding parts as those in the conventional example of FIG. (22) is a magnet provided in a part of a pipe (11) made of, for example, rubber, which connects the circulation pump (10) and the injection nozzle (12), and (23) is near the magnet (22). It is a Hall element provided.

FIG. 2 is an enlarged perspective view of a main part of FIG. (11a) is a pressure reaction part integrally formed with a part of a pipe (11) made of rubber, for example, and a magnet (22) is attached to the upper part of the pipe (11a). ), So that it can respond to the change in pressure of the wash water circulating inside. (twenty three
a) is a lead wire for taking out the signal of the hall element (23),
The magnet (22), the hall element (23), the pressure reaction section (11a), the lead wire (23a), etc. constitute a pressure detecting means for washing water.

FIG. 3 is an electrical block diagram showing an embodiment of the present invention. (24) is a control circuit, (25) is an indicator lamp for notifying the change in pressure of washing water, and (26) is a buzzer for notifying as well.
The hall element (23), the display lamp (25), and the buzzer (26) are connected to the control circuit (24), respectively. The display lamp (25) and the buzzer (26) are provided on the control panel (21).

The operation of the present invention configured as described above will be described below. When cleaning is started, the circulation pump (10) first operates to send cleaning water to the injection nozzle (12). For this reason, the water pressure in the pipe (11) rises, and the pressure reaction part (11a) of the pipe (11) expands with the pressure and the magnet (2
2) approaches the hall element (23) and changes the impedance of the hall element (23). The control circuit (24) is provided with a delay time from the start of cleaning until the impedance of the hall element (23) changes, and after the delay time elapses, the impedance of the hall element (23) is restored during cleaning. Watch as you do.

When a large amount of debris is collected in the filter (7) during cleaning and the filter (7) is clogged, the circulation amount of cleaning water is reduced and the pressure in the pipe (11) is reduced. Therefore, the pressure reaction part (11a) contracts, the magnet (22) separates from the hall element (23), and the impedance of the hall element (23) is restored. As a result, the control circuit (24) causes the indicator lamp (2
5) blinks and sounds the buzzer (26) to notify the decrease in the circulating amount of wash water.

FIG. 4 is a front view showing another embodiment of the present invention. (3
5) is a pressure switch provided outside the washing chamber (2) in the washing machine body (1). Reference numeral (11b) is a branch pipe branched from a pipe (11) connecting between the output side of the circulation pump (10) and the injection nozzle (12) and transmitting a change in water pressure to the pressure switch (35). . The pressure switch (35) and the branch pipe (11b) constitute a pressure detecting means.

FIG. 5 is an electrical block diagram of this embodiment. (24a)
Is a control circuit, (25) is a notification display lamp, and (26) is a notification buzzer. The contact of the pressure switch (35) is connected to the control circuit (24a), and the display lamp (25) and the buzzer (26) are also connected to the control circuit (24a). The display lamp (25) and the buzzer (26) are attached to the control panel (21).

In the present embodiment configured as described above, when the cleaning is started, the circulation pump (10) first operates to send the cleaning water to the injection nozzle (12). Therefore, the water pressure in the pipe (11) and the branch pipe (11b) rises, and the pressure switch (3
The pressure is transmitted to 5) and the contact of the pressure switch (35) is activated. Therefore, after the control circuit (24a) has passed an arbitrary delay time from the start of washing until the contact of the pressure switch (35) operates, the water pressure in the pipe (11) decreases and the pressure switch (35) ) Watch for the contact to come back.

When a large amount of debris is collected in the filter (7) during cleaning and the filter (7) is clogged and the circulation amount of cleaning water is reduced, the pressure in the pipe (11) is reduced and the injection nozzle (12) ) Reduces the injection amount of wash water from the injection port (13) attached to (1). Therefore, by setting the contact return pressure of the pressure switch (35) to an arbitrary pressure, it is possible to detect this decrease in the circulation amount.

When the contact of the pressure switch (35) returns, the control circuit (24
a) causes the indicator lamp (25) to blink or the buzzer (2
6) Sounds to notify that the circulation amount of wash water has decreased.

FIG. 6 is a front view showing another embodiment of the present invention, in which (40) is a flow meter and (11c) and (11d) are pipes. Flow meter (4
Circulation pump (10) on the inlet side of 0) via pipe (11c)
The outlet side is connected to the injection nozzle (12) through the pipe (11d).

FIG. 7 is a sectional view of the flowmeter (22) shown in FIG.
(27) is a lid having a guide post in the center, (28) is a reed switch housed in the guide post of the lid (27),
Reference numeral (29) is a lead wire attached to the reed switch (28) for taking out a signal. (30) is a float with a specific gravity of 1.0 or more inserted in the guide post of the lid (27), and its diameter is set smaller than the inner diameter of the case of the flowmeter (40).
Water is flowing around. (31) is a stopper of the float (30), and (32) is a magnet which is embedded in the float (30) and operates the reed switch (25). In addition, (40a) is the inlet of the flow meter (40) and the float (3
It is directly below (0) and is connected to the pipe (11c). Further, (40b) is an outlet of the flowmeter (40), which is provided above the stop position (solid line portion) of the float (30) when there is no water flow, and is connected to the pipe (11d).

FIG. 8 is an electrical block diagram of this embodiment. (24b)
Is a control circuit, (25) is a notification display lamp, and (26) is a notification buzzer. The contact point of the reed switch (28) is connected to the control circuit (24b), and the display lamp (25) and the buzzer (26) are also connected to the control circuit (24b). The display lamp (25) and the buzzer (26) are attached to the control panel (21).

The operation of the present embodiment configured as described above will be described below. First, in the normal state where the equipment is stopped, the float (30) of the flowmeter (40) is in the lower position (solid line position in FIG. 7), and the reed switch (28) is turned on by the magnet (32). is there. Next, when the cleaning is started, the circulation pump (10) is operated, and the cleaning water is sent to the injection nozzle (12) via the flow meter (40). When the flow rate of the flow meter (40) exceeds a predetermined flow rate, the float (30) rises and moves to the position shown by the broken line in FIG. As a result, the reed switch (28) is separated from the magnet (32) and is turned off. The control circuit (24b) provides a delay time from when cleaning starts until the reed switch (28) turns off, and after this time elapses, the reed switch (28) turns on again during cleaning. To monitor. When a large amount of debris is collected in the filter (7) during washing and the filter (7) is clogged and the circulation amount of the wash water drops to a predetermined level, the float (30) moves from the broken line position to the solid line position. Move down and turn on the reed switch (28) with the magnet (32). Therefore, the control circuit (24
In b), the indicator lamp (25) blinks and the buzzer (26) sounds to notify the decrease in circulation amount of wash water.

FIG. 9 is a vertical sectional view of still another embodiment of the present invention.
In the figure, (32) is a magnet attached to one end of the injection nozzle (12), and (28) is a reed switch arranged in the vicinity of the magnet (32), for example, provided on the outer wall of the washing chamber (2). It is housed in a room (36). The magnet (32) may be provided on the lower surface of the injection nozzle (12).

FIG. 10 is an electrical block diagram of this embodiment. (24c)
Is a control circuit having a function of detecting the operation of the reed switch (28) and a means of detecting the rotation speed of the injection nozzle (12) by the operation of the reed switch (28) and notifying that the rotation speed decreases. , (25) is an indicator lamp for information,
(26) is a notification buzzer. Reed switch (28)
Is connected to the control circuit (24c), and the display lamp (25) and the buzzer (26) are also connected to the control circuit (24c). The display lamp (25) and the buzzer (26) are attached to the control panel (21).

Next, the operation of this embodiment will be described. When a predetermined amount of washing water is supplied into the washing cabinet (2) and washing is started, the washing nozzle (12) rotates and the washing water is jetted from the jet port (13) as in the conventional dishwasher. Then, wash the tableware (20) with washing water. At this time, the magnet (28) of the injection nozzle is reed switch (32) every time (12) rotates.
Close to and activate the reed switch (32). on the other hand,
The control circuit (24c) detects whether or not the reed switch (32) is activated within the time set therein.

When a large amount of debris is accumulated in the filter (7) and causes clogging, the circulation amount of cleaning water is reduced, and the rotation number of the injection nozzle (12) and the injection amount of cleaning water from the injection port (13) are correspondingly reduced. Is reduced. When the time required for the injection nozzle (12) to make one revolution becomes longer than the time set in the control circuit (24c), a signal is output from the control circuit (24c), the display lamp (25) blinks, and the buzzer sounds. Sound (26) to report that normal cleaning has not been performed.

The embodiment of FIG. 6 shows the case where the magnet and the reed switch are used as the flow rate detecting means and the rotation detecting means of the injection nozzle is shown in the embodiment of FIG. 9, but other means are used. May be. Further, in each of the above-described embodiments, the case where both the notification display lamp and the buzzer are provided is shown, but either one may be omitted.

[Effects of the Invention] As is apparent from the above description, according to the present invention, it is possible to easily know a decrease in the circulation amount of cleaning water due to clogging of a filter or the like, and therefore, a predetermined cleaning is not performed. With this, the washing process is not completed, and the dishes can always be sufficiently washed.

[Brief description of drawings]

1, 2, and 3 are a front view, a perspective view, an electrical block diagram, and a fourth view, respectively, showing the essential parts of an embodiment of the present invention.
FIG. 5 and FIG. 5 are a front view and an electrical block diagram respectively showing the main part of another embodiment of the present invention, and FIGS. 6, 7, and 8 are the main parts of another embodiment of the present invention. FIG. 9 is a vertical sectional view and an electrical block diagram showing another embodiment of the present invention, and FIG. 11 is a conventional dishwasher. It is a longitudinal cross-sectional view showing an example. In the figure, (1) is the main body of the washing machine, (2) is the washing cabinet,
(4) is a drainage sump, (5) is a water supply port, (6) is a drainage port,
(7) is a filter, (10) is a circulation pump, (11), (11
c), (11d) are pipes, (11a) are pressure reaction parts, (11d)
Is a branch pipe, (12) is an injection nozzle, (13) is an injection port,
(14) drain pipe, (15) drain pump, (16) opening, (17) door, (19) basket, (20) tableware, (2
1) is the control panel, (22) is the magnet, (2
3) is a hall element, (24), (24a), (24b) is a control circuit, (25) is a notification display lamp, (26) is a notification buzzer, (27) is a lid, and (28) is Reed switch, (29) lead wire, (30) float, (31) stopper, (3
2) is a magnet, (35) is a pressure switch, and (40) is a flow meter. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-100859 (JP, A) JP-A-62-148633 (JP, A) Actually opened 63-107666 (JP, U)

Claims (2)

[Claims] 1. A jet nozzle for jetting wash water, a filter for filtering the wash water jetted from the jet nozzle, a drainage pool for storing the wash water filtered by the filter, and a drainage pool for storing the wash water. In a dishwasher having a circulation pump for sending cleaning water to the jet nozzle under pressure, pressure detection means for detecting the pressure of the wash water in a circulation path connecting the drainage reservoir and the jet nozzle, and the pressure detection means A dishwasher comprising: a notification unit that notifies the pressure drop of the wash water based on a detected value. 2. A flow rate detecting means for detecting the flow rate of wash water in a circulation path connecting the drainage reservoir and the injection nozzle, in place of the pressure detecting means and the informing means, and a detection value of the flow rate detecting means. The dishwasher according to claim 1, further comprising: an informing unit that notifies a decrease in the flow rate of the wash water based on the above.