JP7612538B2 - Treatment agent supply device and dishwasher - Google Patents

Description

The present invention relates to a treatment agent supplying device capable of supplying a predetermined amount of treatment agent, such as detergent, sucked from a storage tank of the treatment agent to a supply part together with water, and a dishwasher equipped with this treatment agent supplying device.

Conventionally, this type of treatment agent supplying device is equipped with a main passageway with a water supply valve at its upstream end that supplies water to the supply portion, and a side passageway that introduces the treatment agent stored in a storage tank into the main passageway. The side passageway is provided with a suction unit consisting of a positive displacement pump, a first check valve on the upstream side that allows only the flow to be sucked into the pump, and a second check valve on the downstream side that allows only the flow to be pushed out from the pump. By opening the water supply valve and driving the pump, a predetermined amount of treatment agent is sucked out from the storage tank and sent to the main passageway, and this treatment agent is supplied to the supply portion via the main passageway together with water (see, for example, Patent Document 1). However, in this device, the treatment agent in the pump or the check valve cannot be washed away with water, and the treatment agent remaining in the pump or the check valve may harden, causing the suction unit to malfunction.

Considering this, conventionally, there have been considered a first type of treatment agent supplying device in which a switching means is disposed at the junction of the main passage and the secondary passage, a suction unit is interposed in the part of the main passage downstream of the switching means, and a bypass path is provided connecting the part of the main passage upstream of the switching means with the part of the main passage downstream of the suction unit, and a second type of treatment agent supplying device in which a suction unit is interposed in a bypass path provided to connect the part of the main passage upstream of the switching means disposed at the junction of the main passage and the secondary passage with the part of the main passage downstream of the switching means.

Here, in the first type of treatment agent supplying device, the switching means can be switched between a first state in which the communication between the portion of the mainstream passage upstream of the switching means and the portion of the mainstream passage downstream of the switching means is blocked and the by-flow passage is connected to the portion of the mainstream passage downstream of the switching means, and a second state in which the communication between the portion of the mainstream passage upstream of the switching means and the portion of the mainstream passage downstream of the switching means is connected and the communication between the by-flow passage and the portion of the mainstream passage downstream of the switching means is blocked. The control means of the treatment agent supplying device is configured to perform a suction operation in which the water supply valve is closed and the switching means is switched to the first state, and the pump is driven to suction a predetermined amount of treatment agent from the storage tank toward the portion of the mainstream passage downstream of the switching means, and a delivery operation in which the water supply valve is opened and the switching means is switched to the second state, and the predetermined amount of treatment agent sucked out in the suction operation is delivered to the supply portion together with water via the mainstream passage. With this system, the treatment agent inside the pump and check valve is washed away by water passing through the main passage during discharge operation, preventing malfunction of the suction unit caused by treatment agent remaining inside the pump or check valve.

In the second type of treatment agent supplying device, the switching means can be switched between a first state in which the communication between the portion of the mainstream passage upstream of the switching means and the portion of the mainstream passage downstream of the switching means is blocked and the by-flow passage is connected to the portion of the mainstream passage upstream of the switching means, and a second state in which the communication between the portion of the mainstream passage upstream of the switching means and the portion of the mainstream passage downstream of the switching means is connected and the communication between the by-flow passage and the portion of the mainstream passage upstream of the switching means is blocked. The control means of the treatment agent supplying device is configured to perform a suction operation in which the water supply valve is closed and the switching means is switched to the first state to drive the pump to suck out a predetermined amount of treatment agent from the storage tank toward the portion of the mainstream passage upstream of the switching means, and a delivery operation in which the water supply valve is opened and the switching means is switched to the second state to deliver the predetermined amount of treatment agent sucked out in the suction operation to the supply portion together with water through the mainstream passage. In this device, by setting the volume of the main passage upstream of the switching means to the above-mentioned specified amount or more, the treatment agent will not reach the suction unit during suction operation. Therefore, the treatment agent will not enter the pump or the check valve, and malfunctions of the suction unit due to treatment agent remaining inside the pump or the check valve can be prevented. Even if the treatment agent reaches the suction unit during suction operation, the treatment agent inside the pump and the check valve is washed away by water passing through the bypass during delivery operation, preventing malfunctions of the suction unit.

However, in both the first and second types of treatment agent supplying device, water tends to flow into the bypass passage during the discharge operation, and even if the amount of water supplied through the main passage and the bypass passage during the discharge operation reaches a predetermined specified amount of water, the amount of water flowing through the main passage is insufficient, and some of the specified amount of treatment agent sucked out during the suction operation may remain in the main passage.

JP 2020-74823 A

In view of the above, the present invention has as its first objective the provision of a treatment agent supplying device of the above first or second type that prevents a portion of the predetermined amount of treatment agent sucked out during the suction operation from remaining in the main passage during the discharge operation, and as its second objective the provision of a dishwasher equipped with this treatment agent supplying device.

In order to solve the first problem, the first invention of the present application is characterized in that in the first and second types of treatment agent supplying devices, a throttling means is provided in the bypass passage to throttle the flow rate of water flowing through the bypass passage, so that the proportion of the amount of water supplied to the supplying part through the mainstream passage out of the predetermined amount of water supplied to the supplying part through the mainstream passage and the bypass passage during the delivery operation is equal to or greater than the value required to deliver all of the predetermined amount of treatment agent.

In order to solve the first problem, the second invention of the present application provides a treatment agent supplying device of the first type, in which a second switching means is provided in either the bypass passage, the branch between the bypass passage and a portion of the main passage upstream of the switching means, or the junction between the bypass passage and a portion of the main passage downstream of the suction unit, and the bypass passage, and is switchable between an open state that allows water to pass through the bypass passage and a blocked state that prevents water from passing through the bypass passage, and the control means switches the second switching means to an open state during operation to supply only water to the supply section, but switches the second switching means to a blocked state at least during discharge operation.

In order to solve the second problem, the third invention of the present application is a dishwasher equipped with a washing tub for storing tableware, and is equipped with a treatment agent supplying device capable of supplying a predetermined amount of detergent, which is a treatment agent, sucked out from a storage tank for the detergent together with water to the washing tub, which is a supply receiving part, characterized in that the treatment agent supplying device is configured as the treatment agent supplying device of the first or second invention.

According to the first invention, the throttle means interposed in the bypass passage increases the flow rate of water flowing through the mainstream passage, and when a specified amount of water is supplied to the supply portion through the mainstream passage and the bypass passage during the discharge operation, the specified amount of treatment agent sucked into the mainstream passage during the suction operation can be discharged from the mainstream passage in its entirety. Also, according to the second invention, the second switching means is switched to a cut-off state during the discharge operation, and water does not flow through the bypass passage, so that the specified amount of water supplied to the supply portion flows only through the mainstream passage, and the specified amount of treatment agent sucked into the mainstream passage during the suction operation can be discharged from the mainstream passage in its entirety. Therefore, it is possible to prevent a portion of the specified amount of treatment agent sucked out during the suction operation from remaining in the mainstream passage during the discharge operation.

1 is a schematic cross-sectional side view of a dishwasher equipped with a treatment agent supplying device according to an embodiment of the present invention. 1 is a circuit diagram of a treatment agent supplying device according to a first embodiment of the present invention. FIG. 5 is a circuit diagram of a treatment agent supplying device according to a second embodiment of the present invention. FIG. 11 is a circuit diagram of a treatment agent supplying device according to a third embodiment of the present invention.

The dishwasher shown in FIG. 1 comprises an exterior case 1 and a washing tank 2 for storing tableware W, which is provided inside the exterior case 1 so as to be freely inserted and removed at the front. Water is supplied to the washing tank 2 via a water supply line 3 and a treatment agent supply device 4, which will be described in detail later. Inside the washing tank 2, there are a dish basket 21 for placing the tableware W, a washing nozzle 22 for spraying washing water toward the dish basket 21, and a heater 23. A stop valve 31 is provided in the water supply line 3, and a drain plug 32 is connected to the part of the water supply line 3 downstream of the stop valve 31.

A water reservoir 24 is recessed in the bottom of the cleaning tank 2. A cleaning/drainage pump 5 is provided in communication with the water reservoir 24, and a water level detector 6 is also provided in communication with the water reservoir 24 to detect the water level in the cleaning tank 2. When the cleaning/drainage pump 5 is rotated forward, cleaning water is circulated into the cleaning tank 2 via the cleaning nozzle 22, and when the cleaning/drainage pump 5 is rotated reversely, the cleaning water in the cleaning tank 2 is drained through the drainage channel 7. The drainage channel 7 is provided with an inverted U-shaped riser 71 to prevent backflow, an air vent 72, a drainage trap 73, and a check valve 74.

A drying fan 8 is provided inside the exterior case 1 to blow drying air into the cleaning tank 2. In addition, a processing agent supply device 4 and a controller 9 that controls the cleaning/drainage pump 5, heater 23, and drying fan 8 and also serves as a control means for the processing agent supply device 4 are provided inside the hollow front door section 25 at the front of the cleaning tank 2, and an operation section 26 on which various switches such as a power switch and an operation switch are arranged is provided at the top end of the front door section 25.

When the operation switch of the operation unit 26 is turned on, first, the detergent as the treatment agent is supplied to the washing tank 2 as the supply destination together with water by the treatment agent supply device 4, and when the water level in the washing tank 2 reaches a predetermined water level and is detected by the water level detection device 6, the supply of detergent and water is stopped. Next, the heater 23 is energized and the washing/drainage pump 5 is rotated forward to heat the washing water (water mixed with detergent) and spray it from the washing nozzle 22, performing a washing operation for a predetermined time. After the washing operation is completed, the washing/drainage pump 5 is reversed to drain the washing water in the washing tank 2, and then water is supplied to the washing tank 2 through the treatment agent supply device 4 until the water level reaches a predetermined level, and then the washing/drainage pump 5 is rotated forward to spray water from the washing nozzle 22, performing a rinsing operation for a predetermined time. After the rinsing operation is completed, the washing/drainage pump 5 is reversed to drain the water in the washing tank 2, and then the heater 23 is energized and the drying fan 8 is driven to perform a drying operation for a predetermined time.

The treatment agent supplying device 4 will be described below with reference to FIG. 2. The treatment agent supplying device 4 can supply a predetermined amount of detergent sucked out from a detergent storage tank 40 to the cleaning tank 2 together with water. The treatment agent supplying device 4 has a main passage 42 with a water supply valve 41 at its upstream end that supplies water to the cleaning tank 2, and the downstream end of the water supply line 3 is connected to the water supply valve 41. The treatment agent supplying device 4 further has a side flow passage 43 that introduces the detergent stored in the storage tank 40 into the main flow passage 42, a switching valve 44 as a switching means arranged at the junction of the main flow passage 42 and the side flow passage 43, and a detergent suction unit 45.

The suction unit 45 is composed of a positive displacement pump 451 having an operating member 451c consisting of a piston, a plunger, a diaphragm, etc. that reciprocates via a crank mechanism 451b by a motor 451a, a first check valve 452 on the upstream side that allows only the flow sucked into the pump 451, and a second check valve 453 on the downstream side that allows only the flow pushed out from the pump 451. The suction unit 45 is interposed in the part 42b of the main passage 42 downstream of the changeover valve 44. In addition, a bypass passage 46 is provided that connects the part 42a of the main passage 42 upstream of the changeover valve 44 to the part of the main passage 42 downstream of the suction unit 45, and a negative pressure intake passage 47 that sucks air in the cleaning tank 2 into the upstream part of the main passage 42 when the water supply passage 3 side becomes negative pressure for some reason. The negative pressure intake passage 47 is composed of a very thin pipe, and the pipe resistance is quite high, so that almost no water flows. Also, instead of constructing the negative pressure intake passage 47 with a very thin pipe, it is possible to take measures to prevent backflow, such as arranging a backflow prevention device such as a vacuum breaker or a pressure reducing backflow preventer at the branch point from the main passage 42.

The switching valve 44 can be switched between a first state in which the portion 42a of the main passage 42 upstream of the switching valve 44 is disconnected from the portion 42b of the main passage 42 downstream of the switching valve 44 and the side flow passage 43 is connected to the portion 42b of the main passage 42 downstream of the switching valve 44, and a second state in which the portion 42a of the main passage 42 upstream of the switching valve 44 is connected to the portion 42b of the main passage 42 downstream of the switching valve 44 and the side flow passage 43 is disconnected from the portion 42b of the main passage 42 downstream of the switching valve 44. The switching valve 44 is normally in the second state and is switched to the first state when energized.

Before the above-mentioned cleaning operation, the controller 9, which is the control means of the treatment agent supply device 4, closes the water supply valve 41 and switches the switching valve 44 to the first state, and drives the pump 451 to perform a suction operation in which a predetermined amount of detergent is sucked out from the storage tank 40 toward the portion 42b of the main passage 42 downstream of the switching valve 44, and then opens the water supply valve 41 and switches the switching valve 44 to the second state, and sends out the predetermined amount of detergent sucked out in the suction operation together with water through the main passage 42 to the cleaning tank 2.

This discharge operation ends when the amount of water supplied to the washing tank 2 reaches a predetermined amount, the water level in the washing tank 2 reaches the above-mentioned predetermined water level, and the water level detection device 6 detects this. Here, the main passage 42 has a high pipe resistance due to the switching valve 44, so water is more likely to flow into the bypass passage 46 during the discharge operation. As a result, even if the total amount of water supplied to the washing tank 2 through the main passage 42 and the bypass passage 46 reaches the above-mentioned specified amount of water, there is a risk that the amount of water flowing through the main passage 42 is insufficient, and a portion of the specified amount of detergent sucked out during the suction operation remains in the main passage 42. Therefore, the bypass passage 46 is provided with an orifice 461 as a throttling means for throttling the flow rate of water flowing through the bypass passage 46. The proportion of the amount of water supplied to the washing tank 2 through the main passage 42 out of the above-mentioned specified amount of water supplied to the washing tank 2 through the main passage 42 and the bypass passage 46 during the discharge operation is set to be equal to or greater than the value required to discharge all of the specified amount of detergent.

Next, a second embodiment of the treatment agent supplying device 4 of the present invention will be described with reference to Fig. 3. The same members and parts as those of the treatment agent supplying device 4 of the first embodiment shown in Fig. 2 are designated by the same reference numerals as above. The difference between the second embodiment of the treatment agent supplying device 4 and the first embodiment is that the suction unit 45 is interposed in a bypass passage 46 that is provided to connect the portion 42a of the mainstream passage 42 upstream of the switching valve 44 and the portion 42b of the mainstream passage 42 downstream of the switching valve 44, and the switching valve 44 is switchable between a first state in which the portion 42a of the mainstream passage 42 upstream of the switching valve 44 is disconnected from the portion 42b of the mainstream passage 42 downstream of the switching valve 44 and the side flow passage 43 is connected to the portion 42a of the mainstream passage 42 upstream of the switching valve 44, and a second state in which the portion 42a of the mainstream passage 42 upstream of the switching valve 44 is connected to the portion 42b of the mainstream passage 42 downstream of the switching valve 44 and the side flow passage 43 is disconnected from the portion 42a of the mainstream passage 42 upstream of the switching valve 44.

In the second embodiment, the pump 451 is driven with the water supply valve 41 closed and the switching valve 44 switched to the first state to perform a suction operation in which a predetermined amount of detergent is sucked from the storage tank 40 toward the portion 42a of the main passage 42 upstream of the switching valve 44, and the water supply valve 41 is opened and the switching valve 44 is switched to the second state to perform a delivery operation in which the predetermined amount of detergent sucked out during the suction operation is delivered together with water via the main passage 42 to the washing tank 2.

The portion 42a of the main passage 42 upstream of the switching valve 44 is provided with a storage section 421 for storing the detergent sucked out during the suction operation. This prevents the detergent from reaching the suction unit 45 during the suction operation. However, instead of providing the storage section 421, it is also possible to lengthen the portion 42a of the main passage 42 upstream of the switching valve 44 so that the detergent does not reach the suction unit 45.

In addition, an orifice 461 serving as a throttle means is provided in the bypass passage 46 downstream of the suction unit 45. The ratio of the amount of water supplied to the washing tank 2 via the main passage 42 to the amount of water supplied to the washing tank 2 via the main passage 42 and the bypass passage 46 during the discharge operation is set to be equal to or greater than the value required to discharge all of the specified amount of detergent sucked out during the suction operation.

Next, a treatment agent supplying device 4 according to a third embodiment of the present invention, shown in FIG. 4, will be described. The same members and parts as those of the treatment agent supplying device 4 according to the first embodiment shown in FIG. 2 are given the same reference numerals. The difference between the treatment agent supplying device 4 according to the fourth embodiment and that according to the first embodiment is that, instead of the orifice 461 according to the first embodiment, an on-off valve 48 is provided in the bypass passage 46 as a second switching means that can be switched between an open state that allows water to pass through the bypass passage 46 and a blocked state that prevents water from passing through the bypass passage 46. The on-off valve 48 is normally in an open state, and is switched to a blocked state when electricity is applied.

During the rinsing operation in which only water is supplied to the cleaning tank 2, the controller 9 (see FIG. 1), which is the control means of the treatment agent supply device 4, switches the on-off valve 48 to an open state, and supplies water to the cleaning tank 2 through the bypass passage 46 as well. This makes it possible to shorten the time required for a specified amount of water to be supplied to the cleaning tank 2. On the other hand, during the discharge operation, the on-off valve 48 is switched to a closed state. As a result, water does not flow through the bypass passage 46, so that the specified amount of water supplied to the cleaning tank 2 flows only through the main passage 42, and all of the specified amount of treatment agent sucked into the main passage 42 during the suction operation can be discharged from the main passage 42. This makes it possible to prevent a portion of the specified amount of treatment agent sucked out during the suction operation from remaining in the main passage 42 during the discharge operation. The on-off valve 48 may be kept open except during the discharge operation, including the rinsing operation, and may be kept closed except during the rinsing operation.

In the third embodiment, the bypass passage 46 is provided with an on-off valve 48 as a second switching means. Alternatively, a three-way valve may be provided as a second switching means at the branch point between the part 42a of the main passage 42 upstream of the switching valve 44 and the bypass passage 46, or at the junction between the part of the main passage 42 downstream of the suction unit 45 and the bypass passage 46. This three-way valve always connects the upstream and downstream parts of the main passage 42 from the three-way valve, and is configured to be freely switched between a state in which the bypass passage 46 is connected to the main passage 42 and a state in which this connection is blocked. By connecting the bypass passage 46 to the main passage 42, the bypass passage 46 is opened to allow water to pass through the bypass passage 46, and by blocking this connection, the bypass passage 46 is blocked to prevent water from passing through the bypass passage 46.

Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, the dishwasher in the above embodiment is a dishwasher with a drying function equipped with a drying fan 8, but may be a dishwasher without a drying function. Furthermore, the treatment agent supplying device 4 in the above embodiment supplies detergent as a treatment agent to the washing tub 2, which is the supplying part of the dishwasher, but may also supply rinse as a treatment agent. The present invention can also be applied to other uses, for example, a treatment agent supplying device that supplies detergent or fabric softener as a treatment agent to the washing tub, which is the supplying part of a washing machine.

2... cleaning tank (supplied part), 4... treatment agent supply device, 40... storage tank, 41... water supply valve, 42... main flow passage, 42a... part of the main flow passage upstream of the switching means, 42b... part of the main flow passage downstream of the switching means, 43... side flow passage, 44... switching valve (switching means), 45... suction unit, 451... pump, 452... first check valve, 453... second check valve, 46... bypass passage, 461... orifice (throttling means), 48... opening/closing valve (second switching means), 9... controller (controlling means).

Claims (4)

A treatment agent supplying device capable of supplying a predetermined amount of treatment agent sucked out from a storage tank of the treatment agent together with water to a supply target portion,
the system comprises a main passage having a water supply valve at an upstream end for supplying water to a supply portion, a side passage for introducing a treatment agent stored in a storage tank into the main passage, a switching means disposed at a junction of the main passage and the side passage, a treatment agent suction unit, and a control means;
The suction unit is composed of a positive displacement pump, a first check valve on the upstream side that allows only a flow to be sucked into the pump, and a second check valve on the downstream side that allows only a flow to be pushed out from the pump, and the suction unit is interposed in a portion of the mainstream passage on the downstream side of the switching means, and a bypass path is provided that connects the portion of the mainstream passage on the upstream side of the switching means and the portion of the mainstream passage on the downstream side of the suction unit,
the switching means is switchable between a first state in which the switching means interrupts communication between a portion of the mainstream passage upstream of the switching means and a portion of the mainstream passage downstream of the switching means and connects the byflow passage with the portion of the mainstream passage downstream of the switching means, and a second state in which the switching means connects the portion of the mainstream passage upstream of the switching means and a portion of the mainstream passage downstream of the switching means and disconnects communication between the byflow passage and the portion of the mainstream passage downstream of the switching means,
the control means is configured to execute a suction operation in which the control means closes the water supply valve and switches the switching means to a first state to drive the pump to suction a predetermined amount of the treatment agent from the storage tank toward a portion of the mainstream passage downstream of the switching means, and a delivery operation in which the control means opens the water supply valve and switches the switching means to a second state to deliver the predetermined amount of the treatment agent sucked out in the suction operation to a supply portion together with water through the mainstream passage,
a throttling means for throttling the flow rate of water flowing through the bypass passage, so that the ratio of the amount of water supplied to the supply destination through the mainstream passage to the amount of water supplied to the supply destination through the mainstream passage and the bypass passage during a discharge operation is equal to or greater than the value required to discharge all of a predetermined amount of the treatment agent. A treatment agent supplying device capable of supplying a predetermined amount of treatment agent sucked out from a storage tank of the treatment agent together with water to a supply target portion,
the system comprises a main passage having a water supply valve at an upstream end for supplying water to a supply portion, a side passage for introducing a treatment agent stored in a storage tank into the main passage, a switching means disposed at a junction of the main passage and the side passage, a treatment agent suction unit, and a control means;
The suction unit is composed of a positive displacement pump, a first check valve on the upstream side that allows only a flow to be sucked into the pump, and a second check valve on the downstream side that allows only a flow to be pushed out from the pump, and the suction unit is interposed in a bypass path provided to connect a portion of the mainstream passage on the upstream side of the switching means to a portion of the mainstream passage on the downstream side of the switching means,
the switching means is switchable between a first state in which the switching means interrupts communication between a portion of the main passage upstream of the switching means and a portion of the main passage downstream of the switching means and connects the byflow passage with the portion of the main passage upstream of the switching means and a second state in which the switching means connects the portion of the main passage upstream of the switching means and a portion of the main passage downstream of the switching means and interrupts communication between the byflow passage and the portion of the main passage upstream of the switching means,
the control means is configured to execute a suction operation in which the control means closes the water supply valve and switches the switching means to a first state to drive the pump to suction a predetermined amount of the treatment agent from the storage tank toward a portion of the mainstream passage upstream of the switching means, and a delivery operation in which the control means opens the water supply valve and switches the switching means to a second state to deliver the predetermined amount of the treatment agent sucked out in the suction operation to a supply portion together with water through the mainstream passage,
A treatment agent supplying device characterized in that a throttling means for throttling the flow rate of water flowing through the bypass passage is provided in a portion of the bypass passage downstream of the suction unit, so that the proportion of the amount of water supplied to the supplying part through the mainstream passage out of a predetermined specified amount of water supplied to the supplying part through the mainstream passage and the bypass passage during a discharge operation is equal to or greater than the value required to discharge all of a predetermined amount of treatment agent. A treatment agent supplying device capable of supplying a predetermined amount of treatment agent sucked out from a storage tank of the treatment agent together with water to a supply target portion,
the system comprises a main passage having a water supply valve at an upstream end for supplying water to a supply portion, a side passage for introducing a treatment agent stored in a storage tank into the main passage, a switching means disposed at a junction of the main passage and the side passage, a treatment agent suction unit, and a control means;
The suction unit is composed of a positive displacement pump, a first check valve on the upstream side that allows only a flow to be sucked into the pump, and a second check valve on the downstream side that allows only a flow to be pushed out from the pump, and the suction unit is interposed in a portion of the mainstream passage on the downstream side of the switching means, and a bypass path is provided that connects the portion of the mainstream passage on the upstream side of the switching means and the portion of the mainstream passage on the downstream side of the suction unit,
the switching means is switchable between a first state in which the switching means interrupts communication between a portion of the mainstream passage upstream of the switching means and a portion of the mainstream passage downstream of the switching means and connects the byflow passage with the portion of the mainstream passage downstream of the switching means, and a second state in which the switching means connects the portion of the mainstream passage upstream of the switching means and a portion of the mainstream passage downstream of the switching means and disconnects communication between the byflow passage and the portion of the mainstream passage downstream of the switching means,
the control means is configured to execute a suction operation in which the control means closes the water supply valve and switches the switching means to a first state to drive the pump to suction a predetermined amount of the treatment agent from the storage tank toward a portion of the mainstream passage downstream of the switching means, and a delivery operation in which the control means opens the water supply valve and switches the switching means to a second state to deliver the predetermined amount of the treatment agent sucked out in the suction operation to a supply portion together with water through the mainstream passage,
a second switching means is provided in either the bypass passage, a branching portion between the bypass passage and a portion of the main passage upstream of the switching means, or a joining portion between the bypass passage and a portion of the main passage downstream of the suction unit; the second switching means is switchable between an open state that allows water to pass through the bypass passage and a blocked state that prevents water from passing through the bypass passage;
A treatment agent supplying device characterized in that the control means switches the second switching means to an open state during operation in which only water is supplied to the supply part, but switches the second switching means to a blocked state at least during a discharge operation. A dishwasher equipped with a washing tank for storing tableware, the washing tank being equipped with a treatment agent supplying device capable of supplying a predetermined amount of detergent, which is a treatment agent, sucked out from a storage tank for the detergent together with water to the washing tank being a receiving part, the treatment agent supplying device being configured as described in any one of claims 1 to 3.

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