JP2021097754A - Washing machine - Google Patents

Abstract

To provide a washing machine which suppresses a valve of a liquid agent automatic input device becoming inoperable.SOLUTION: In a washing machine, a liquid agent automatic input device 11 includes a piston pump 22 comprising at least one piston 22b and a cylinder 22d, and check valves for holding airtightness in the cylinder 22d are provided on an intake side which is on an upstream of the pump and on a discharge side which is on a downstream respectively. Opening/closing of an intake side check valve 23 comes into an open state by a negative pressure of a liquid agent applied to the intake side check valve 23 by drag force of fluid flowing in a path resisting resilience of an intake side check valve spring 23d and the operation of the piston 22b, from the state where the same is maintained in a closed state by the resilience of the intake side check valve spring 23d. Opening/closing of a discharge side check valve 24 is forcibly brought into the open state by two kinds of force, which are a positive pressure of the liquid agent applied to the discharge side check valve 24 and mechanical force directly applied to the discharge side check valve 24, by the operation of the piston 22b, from the state where the same is maintained in a closed state by the resilience of a discharge side check valve spring 24d.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a washing machine that performs washing using a liquid agent such as a detergent or a fabric softener.

Patent Document 1 discloses a drum-type washing machine provided with an automatic liquid agent charging device.

The drum-type washing machine in Patent Document 1 includes a liquid agent tank for accommodating the liquid agent and an automatic liquid agent charging device for supplying the liquid agent from the liquid agent tank to the washing tub. The liquid agent automatic charging device has a structure of a piston pump including a cylinder formed in a tubular shape, a piston built in the cylinder and operating to suck and discharge liquid detergent, and a drive motor for driving the piston.

Special Table 2016-524995

The liquid agent automatic charging device for automatically charging liquid agents such as detergents and fabric softeners in washing machines is easily exposed to foreign substances generated from the living environment such as sand and dust. In particular, in the mechanism for sequentially delivering the liquid agent to the washing tub using the piston pump, there is a problem that the above-mentioned foreign matter is easily clogged in the valve mechanism for limiting the flow direction of the liquid agent, and the valve becomes inoperable.

The drum-type washing machine in the present disclosure includes a main body, a water tank unit elastically supported inside the main body, a washing tub rotatably provided inside the water tank unit, and one or more liquid agents for accommodating the liquid agent. The liquid agent automatic charging device includes a tank and an automatic liquid agent charging device for supplying the liquid agent from the liquid agent tank to the washing tub, and the liquid agent automatic charging device has a piston pump including at least one piston and a cylinder, and sucks the liquid agent into the cylinder. Check valves that maintain airtightness in the cylinder are provided on the suction side, which is upstream of the pump, and on the discharge side, which is downstream, respectively, to open and close the check valve on the suction side. Is maintained in the closed state by the restoring force of the suction-side check valve spring, and is changed to the suction side by the reaction force of the fluid flowing through the path against the restoring force of the suction-side check valve spring and the operation of the piston. The check valve is opened by the negative pressure of the liquid agent applied to the check valve, and the opening and closing of the check valve on the discharge side is maintained in the closed state by the restoring force of the check valve spring on the discharge side. The open state is forcibly opened by two forces, the positive pressure of the liquid agent applied to the side check valve and the mechanical force directly applied to the discharge side check valve.

Even if foreign matter is clogged in the valve mechanism by forcibly opening the check valve on the discharge side, the operation of the check valve is not lost and the reliability of the entire system can be maintained high.

Longitudinal sectional view of the washing machine according to the first embodiment Perspective view showing the appearance of the washing machine Top view of the automatic liquid injection device of the washing machine Cross-sectional view of the side surface of the liquid agent automatic injection device of the washing machine Cross-sectional view of the main part of the liquid agent automatic injection device of the washing machine Cross-sectional view of the main part of the piston pump of the automatic liquid injection device of the washing machine Detailed shape view of the main part of the piston pump of the automatic liquid injection device of the washing machine

Hereinafter, embodiments will be described in detail with reference to the drawings.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 7. In the present embodiment, a drum-type washing machine will be described as an example of the washing machine.

(1-1. Configuration)
The basic configuration of the washing machine will be described.

FIG. 1 is a vertical cross-sectional view of the washing machine according to the first embodiment.

As shown in FIG. 1, the water tank unit 2 is vibration-proof supported by a spring body (not shown) and a vibration-proof damper 5 provided between the water tank unit 2 and the main body 3. Inside the water tank unit 2, a rotating drum 1 for accommodating laundry is rotatably provided. The rotating drum 1 and the water tank unit 2 are arranged so that the rotating shaft of the rotating drum 1 is inclined from the front to the rear. The rotary drum 1 is rotationally driven by a motor 6 provided at the bottom of the water tank unit 2.

Next, the basic configuration of the liquid agent automatic charging device 11 will be described.

FIG. 2 is a perspective view showing the appearance of the washing machine according to the first embodiment, FIG. 3 is a plan view of the liquid agent automatic charging device of the washing machine, and FIG. 4 is a side view of the liquid agent automatic charging device of the washing machine. FIG. 5 is a cross-sectional view of a main part of the liquid agent automatic charging device of the washing machine.

As shown in FIG. 2, a detergent container 7 is arranged in the upper front part of the main body 3, and a storage portion 7a (see FIG. 4) is formed inside the detergent container 7. A detergent container 8 used for manually charging a detergent and a softener is detachably stored in front of the storage portion 7a.

Further, behind the storage portion 7a, a detergent tank 9 and a softener tank 10 filled with a liquid agent to be supplied to the liquid agent automatic charging device 11 (described later) are detachably stored.

As shown in FIGS. 3 and 4, an automatic liquid agent charging device 11 is arranged outside the rear of the detergent container 7. The liquid agent automatic charging device 11 sucks the liquid agent filled in the detergent tank 9 and the softener tank 10 by the piston pump 22, and sends the liquid agent to the water tank unit 2 via the discharge path 11a and the connecting hose 25.

Further, a water supply valve 16 for supplying water is provided behind the liquid agent automatic charging device 11. The water supply valve 16 is provided so as to be openable and closable, and the water supply path 11b connects the water supply valve 16 and the liquid agent automatic charging device 11.

Next, the detailed configuration of the liquid agent automatic charging device 11 will be described.

As shown in FIGS. 4 and 5, the bottoms of the detergent tank 9 and the softener tank 10 are provided with a detergent supply port 9a and a softener supply port 10a, respectively. The detergent supply port 9a and the softener supply port 10a are provided with a detergent side check valve 9b and a softener side check valve 10b, respectively, and the detergent side check valve 9b and the softener side check valve 10b are provided with a detergent side. A check valve rubber body 9c and a softener side check valve rubber body 10c are attached. When the detergent tank 9 and the softener tank 10 are removed, the detergent side check valve 9b and the detergent side check valve rubber body 9c, the softener side check valve 10b and the softener side check valve rubber body 10c are used. , The detergent and the softener are prevented from flowing out from the detergent tank 9 and the softener tank 10.

The detergent suction port 14 and the softener suction port 15 are formed so as to protrude from the liquid agent automatic charging device 11. The detergent suction port 14 and the softener suction port 15 are connected to the detergent supply port 9a and the softener supply port 10a in a state where the detergent tank 9 and the softener tank 10 are stored in the storage portion 7a. It is detachably provided with respect to the softener tank 10.

Detergent side ribs 14a and softener side ribs 15a are provided at the tips of the detergent suction port 14 and the softener suction port 15, and detergent side V-rings 14b are provided on the outer periphery of the detergent side ribs 14a and the softener side ribs 15a. The softener side V ring 15b is arranged. This improves the airtightness between the suction port and the supply port.

Further, the detergent suction port 14, the detergent side rib 14a at the tip of the softener suction port 15, the detergent side protruding rib 14e and the softener side protruding rib 15e are provided so as to protrude from the softener side rib 15a, and the detergent tank is provided. When the fabric softener tank 10 and the fabric softener tank 10 are connected to the detergent supply port 9a and the fabric softener supply port 10a in a state of being stored in the storage portion 7a, the detergent side protruding rib 14e and the softener side protruding rib 15e are the detergent side check valves. 9b, the softener side check valve 10b is pushed to open the path, and the detergent and the softener are configured to flow into the detergent inhalation path 14c and the softener inhalation path 15c.

The detergent suction port 14 and the softener suction port 15 are connected to the piston pump 22 via the detergent suction path 14c and the softener suction path 15c, respectively. The detergent suction path 14c and the softener suction path 15c are provided with a detergent side switching valve 20 and a softener side switching valve 21, respectively.

The detergent side switching valve 20 and the softener side switching valve 21 are switching valves that selectively discharge the liquid detergent in the detergent tank 9 and the liquid softener in the softener tank 10 to the piston pump 22.

The detergent side switching valve 20 and the softener side switching valve 21 are composed of a detergent side valve body 20a, a detergent side coil 20b, a detergent side switching valve spring 20c, and a detergent side switching valve body 20e, and are composed of a detergent side switching valve body 20e. The switching valve 21 is composed of a softener side valve body 21a, a softener side coil 21b, a softener side switching valve spring 21c, and a softener side switching valve body 21e.

At the tips of the detergent side valve body 20a and the softener side valve body 21a, the detergent side switching valve body 20e and the detergent side rubber body 20d are flexible at positions protruding from the softener side switching valve body 21e, respectively. The agent side rubber body 21d is attached. When the detergent side coil 20b and the softener side coil 21b are not energized, the detergent side switching valve spring 20c and the softener side switching valve spring 21c form the detergent side valve body 20a and the softener side valve body 21a. , Detergent suction port 14, softener suction port 15 side is urged, and at the tip of the detergent suction path 14c, the substantially cylindrical detergent discharge port 14d, which is the discharge port of the softener suction path 15c, and the softener discharge port 15d. , The detergent side rubber body 20d and the softener side rubber body 21d are pressed against each other. This prevents the detergent and the softener in the detergent suction path 14c and the softener suction path 15c from flowing out from the detergent discharge port 14d and the softener discharge port 15d.

When the detergent side coil 20b is energized, the detergent side valve body 20a is pulled away from the detergent suction port 14 against the detergent side switching valve spring 20c, and is between the detergent side rubber body 20d and the detergent discharge port 14d. A gap is generated in the detergent tank 9, and the liquid detergent in the detergent tank 9 is discharged.

Similarly, when the softener side coil 21b is energized, the softener side valve body 21a is pulled away from the softener suction port 15 against the softener side switching valve spring 21c, and the softener side rubber body A gap is generated between 21d and the softener discharge port 15d, and the liquid softener in the softener tank 10 is discharged.

The water supply path 11b connected to the water supply valve 16 is connected to the detergent side switching valve 20 and the softener side switching valve 21 in this order. When the detergent side switching valve 20 is in the open state, the water supplied from the water supply valve 16 reaches the piston pump 22 together with the discharged liquid detergent via the water supply path 11b. Further, when the softener side switching valve 21 is in the open state, the water supplied from the water supply valve 16 reaches the piston pump 22 together with the released liquid softener via the water supply path 11b.

Next, the piston pump 22 will be described.

FIG. 6 is a cross-sectional view of a main part of the piston pump of the liquid agent automatic charging device of the washing machine according to the first embodiment, and FIG. 7 is a detailed shape view of the main part of the piston pump of the liquid agent automatic charging device of the washing machine.

As shown in FIG. 6, the piston pump 22 includes a drive motor 22a, a cam 22c, a piston 22b, and a cylinder 22d. The cam 22c converts the rotational driving force of the drive motor 22a into vertical linear motion. A part of the piston 22b is included in the cylinder 22d. The piston 22b is driven by the cam 22c and slides inside the cylinder 22d while linearly moving up and down.

On the discharge side, a power transmission mechanism that converts the rotary motion of the cam 22c into a reciprocating motion of the piston 22b is used, and a protruding rib 28 provided at the lower end of the piston 22b is used to move the discharge side check valve 24a of the discharge side check valve 24. It is equipped with a mechanism that forcibly opens the valve by pushing out.

A packing 22e is arranged between the piston 22b and the cylinder 22d, and has a structure in which liquid or air does not leak to the outside of the cylinder from between the piston 22b and the cylinder 22d.

The lower portion of the cylinder 22d is formed with a pouring portion 22f so as to form an inverted U-shaped pipe from the suction side to the discharge side. A suction-side check valve 23 is provided on the upstream suction side, and a discharge-side check valve 24 is provided on the downstream discharge side, limiting the direction in which the liquid is delivered in one direction.

The suction side check valve 23 and the discharge side check valve 24 on the injection tube portion 22f, which is the cylindrical flow path of the cylinder 22d, have the suction side check valve movable portion 23a and the discharge side check valve movable portion. It is composed of 24a, a suction-side check valve fixing portion 23b, and a discharge-side check valve fixing portion 24b, respectively.

The suction-side check valve movable portion 23a and the discharge-side check valve movable portion 24a have spring constants such that the suction-side check valve spring 23d ≤ the discharge-side check valve spring 24d. A discharge-side check valve spring 24d is provided. Then, the suction-side check valve movable portion 23a and the discharge-side check valve movable portion 24a are pressed against the suction-side check valve fixing portion 23b and the discharge-side check valve fixing portion 24b, and seal between them. The suction side check valve rubber body 23c and the discharge side check valve rubber body 24c are mounted so as to do so.

When the piston 22b moves upward while the corresponding check valve of the suction-side check valve movable portion 23a and the discharge-side check valve movable portion 24a is open, the liquid agent is discharged from the detergent suction port 14 and the softener suction port 15. When the piston 22b is introduced and moves downward, the liquid agent is discharged from the discharge port.

The mechanism by which the check valve opens is as follows.

The suction-side check valve 23 urges the suction-side check valve movable portion 23a to be constantly closed by the suction-side check valve spring 23d, and the piston 22b moves upward to resist the fluid flowing through the pipeline. When the suction side check valve movable part 23a is opened against the suction side check valve spring 23d and the fluid resistance decreases and stops, the suction side check valve spring 23d restores the suction side check valve. It is a mechanism for closing the valve movable portion 23a.

Further, in the discharge-side check valve 24, the discharge-side check valve movable portion 24a is always urged to close the valve by the discharge-side check valve spring 24d, and the piston 22b moves downward to cause a fluid flowing through the pipeline. The check valve spring 24d on the discharge side is opened against the check valve spring 24d on the discharge side, and when the reaction force of the fluid is reduced and stopped, the restoring force of the check valve spring 24d on the discharge side is used on the discharge side. This is a mechanism for closing the check valve movable portion 24a.

(1-2. Operation)
The operation of the liquid agent automatic charging device 11 in the washing machine configured as described above will be described below.

The user fills the detergent tank 9 and the softener tank 10 with the liquid detergent and the liquid softener in advance. When the user puts the laundry in the rotating drum 1 and starts the washing operation, the washing machine carries out a series of washing operations such as a washing process, a rinsing process, and a dehydration process. The liquid agent automatic charging device 11 executes the liquid agent automatic charging operation at the optimum timing of each step in the washing operation.

Hereinafter, the operation when the detergent is automatically added will be described as an example.

The liquid agent automatic charging device 11 opens the detergent suction path 14c, sucks out the liquid detergent in the detergent tank 9 by the piston pump 22, and discharges it to the path leading to the water tank unit 2. At this time, the liquid detergent flows through the discharge path 11a in the detergent suction path 14c and the detergent side switching valve 20 that continue from the detergent tank 9 to the water tank unit 2.

As shown in FIG. 7, the dimensions of the protruding rib 28 are such that the protruding rib width 28a> the protruding rib thickness 28b so as not to obstruct the flow of the detergent, and the arc-shaped protruding rib protruding portion 28c on the surface of the protruding rib width 28a. Has a streamlined structure in which the flow path resistance does not increase with respect to the flow of the liquid agent.

In addition, there is a living of sand, dust, etc. between the suction side check valve movable portion 23a and the suction side check valve fixing portion 23b, and the discharge side check valve movable portion 24a and the discharge side check valve fixing portion 24b. When foreign matter generated from the environment flows in, it becomes a bitten state and the opening / closing operation of the valve is hindered. Therefore, the biting state of the foreign matter causes a problem such as the suction and the discharge becoming impossible due to the operation of the piston pump 22.

Therefore, the check valve movable part is made more movable to expand the valve opening / closing gap (the reaction force of the fluid flowing through the suction side path + the negative pressure of the liquid agent applied to the suction side check valve 23 due to the operation of the piston 22b). > The restoring force of the suction side check valve spring 23d, and (the positive pressure of the liquid agent applied to the valve due to the operation of the piston 22b + the mechanical force applied by the protruding rib 28 to the discharge side check valve 24)> the discharge side check valve The restoring force of the spring 24d is used. Further, the spring constants of the suction-side check valve spring 23d and the discharge-side check valve spring 24d are set to the relationship of the suction-side check valve spring 23d ≤ the discharge-side check valve spring 24d, and suction is not directly applied with mechanical force. By reducing the spring constant of the side check valve spring 23d, the suction side check valve movable portion 23a can be easily moved, and the stroke of the valve can be increased against the resistance of the fluid flowing through the conduit to the valve portion. Suppresses foreign matter biting.

As described above, the drum-type washing machine according to the first embodiment includes a main body 3, a water tank unit 2 elastically supported inside the main body 3, and a rotary drum 1 rotatably provided inside the water tank unit 2. The detergent tank 9 and the softener tank 10 for accommodating the liquid agent, and the liquid agent automatic charging device 11 for supplying the liquid agent from the detergent tank 9 and the softener tank 10 to the rotary drum 1 include a cylinder 22d formed in a tubular shape and at least. It has a piston 22b which is partially penetrated into the cylinder 22d and slidably provided with the cylinder 22d, and a piston pump 22 including a cam 22c for linearly moving the piston 22b in the longitudinal direction and a drive motor 22a.

From the above, the piston 22b reciprocates in the cylinder 22d by the mechanical force of the drive motor. Since the protruding rib 28 is provided at the lower end of the piston 22b, the movement of the piston and the operation of opening and closing the valve are synchronized.

As a result, even if a foreign substance is clogged in the valve mechanism portion, the valve can be forcibly opened by mechanical force, so that it is possible to prevent the valve from becoming inoperable.

(1-3. Effects, etc.)
As described above, in the present embodiment, the washing machine includes the main body 3, the water tank unit 2 elastically supported inside the main body 3, and the rotary drum 1 rotatably provided inside the water tank unit 2. One or more detergent tanks 9 for accommodating the liquid agent and an automatic liquid agent charging device 11 for supplying the liquid agent from the detergent tank 9 to the rotary drum 1 are provided, and the liquid agent automatic charging device 11 includes at least one piston 22b and a cylinder 22d. Check valves that have a piston pump 22 and maintain airtightness in the cylinder 22d for sucking the liquid into the cylinder 22d or discharging it to the path leading to the rotary drum 1 are upstream and downstream of the pump. The opening and closing of the suction side check valve 23 is countered by the restoring force of the suction side check valve spring 23d from the state of being maintained in the closed state by the restoring force of the suction side check valve spring 23d. Due to the reaction force of the fluid flowing through the path and the operation of the piston 22b, the negative pressure of the liquid agent applied to the suction side check valve 23 opens the open state, and the discharge side check valve 24 is opened and closed by the restoring force of the discharge side check valve spring 24d. From the state maintained in the closed state by the operation of the piston 22b, it is forcibly opened by two forces, the positive pressure of the liquid agent applied to the discharge side check valve 24 and the mechanical force directly applied to the discharge side check valve 24. Make it a state.

As a result, even if foreign matter is clogged in the valve mechanism by forcibly opening the discharge side check valve 24, the operation of the discharge side check valve is not lost and the reliability of the entire system is maintained high. be able to.

Further, the mechanical force directly applied to the discharge side check valve 24 is configured to be synchronized with the operation of the piston 22b.

As a result, the discharge side check valve 24 can be reliably pushed.

Further, the piston 22b is integrally provided with a protruding rib 28 that directly pushes the discharge side check valve 24.

As a result, the discharge side check valve 24 can be reliably pushed with a simple configuration.

Further, the protruding rib 28 has a streamlined structure in which the flow path resistance does not increase.

As a result, the protruding rib 28 can be provided without interfering with the flow of the liquid agent.

Further, the spring constants of the suction-side check valve spring 23d and the discharge-side check valve spring 24d are configured such that the suction-side check valve spring 23d ≤ the discharge-side check valve spring 24d.

As a result, the negative pressure applied to the suction side check valve 23 due to the operation of the piston and the reaction force of the fluid flowing through the pipeline (suction side), and the positive pressure applied to the discharge side check valve 24 due to the operation of the piston and the reverse of the discharge side. The mechanism that opens and closes the valve by the mechanical force (discharge side) directly applied to the stop valve 24 and the restoring force of the spring reduces the spring constant on the suction side from the discharge side to reduce the stroke of the check valve on the suction side. Since it can be made large, it is possible to prevent foreign matter from getting caught in the valve portion.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technology disclosed in the present application. However, the techniques in the present disclosure are not limited to this.

Therefore, other embodiments will be illustrated below.

In the first embodiment, a vertical washing machine has been described as an example of the washing machine. The washing machine may be one that can wash the laundry using the liquid agent. Therefore, the washing machine is not limited to the vertical washing machine, and may be a drum type washing machine or a two-tank type washing machine.

In the first embodiment, a piston that moves up and down has been described as an example of a piston pump. Since the piston may move linearly, it is not limited to vertical movement, and may move linearly in the horizontal direction.

In the first embodiment, the structure is described in which the water supply route, the liquid detergent route, and the softener route are merged into one route. The same effect can be obtained by constructing a route in combination. Similarly, it is not necessary to pass water through the liquid detergent and fabric softener pathways.

The present disclosure is applicable to a washing machine equipped with a liquid agent charging device. Specifically, the present disclosure is applicable to vertical washing machines, drum-type washing machines, two-tank washing machines, and the like.

1 rotating drum (washing tub)
2 Water tank unit 3 Main body 6 Motor 7 Detergent container 7a Storage 8 Detergent container 9 Detergent tank (liquid agent tank)
9a Detergent supply port 9b Detergent side check valve 9c Detergent side check valve Rubber body 10 Softener tank (liquid agent tank)
10a Softener supply port 10b Softener side check valve 10c Softener side check valve Rubber body 11 Liquid agent automatic injection device 11a Discharge route 11b Water supply route 14 Detergent suction port 14a Detergent side rib 14b Detergent side V ring 14c Detergent suction route 14d Detergent discharge port 14e Detergent side protruding rib 15 Softener side protruding rib 15a Softener side rib 15b Softener side V ring 15c Softener suction route 15d Softener side protruding rib 20 Detergent side switching valve 20a Detergent side valve body 20b Detergent side coil 20c Detergent side switching valve spring 20d Detergent side rubber body 20e Detergent side switching valve body 21 Softener side switching valve 21a Softener side valve body 21b Softener side coil 21c Softener side switching valve spring 21d Softener side rubber Body 21e Softener side switching valve body 22 Piston pump 22a Drive motor 22b Piston 22c Cam 22d Cylinder 22e Packing 22f Injection cylinder part 23 Suction side check valve 23a Suction side check valve Movable part 23b Suction side check valve fixing part 23c Suction Side check valve rubber body 23d Suction side check valve spring 24 Discharge side check valve 24a Discharge side check valve movable part 24b Discharge side check valve fixing part 24c Discharge side check valve rubber body 24d Discharge side check valve spring 25 Connecting hose 28 Extruded rib 28a Extruded rib width 28b Extruded rib thickness 28c Extruded rib protruding part

Claims (5)

With the main body
A water tank unit elastically supported inside the main body,
A washing tub rotatably provided inside the water tub unit and
One or more liquid agent tanks to hold the liquid agent,
A liquid agent automatic charging device for supplying a liquid agent from the liquid agent tank to the washing tub is provided.
The liquid agent automatic charging device has a piston pump including at least one piston and a cylinder, and maintains airtightness in the cylinder for sucking the liquid agent into the cylinder or discharging the liquid agent to a path leading to the washing tub. Check valves are provided on the suction side, which is upstream of the pump, and on the discharge side, which is downstream, respectively, and the opening and closing of the check valve on the suction side is maintained in the closed state by the restoring force of the check valve spring on the suction side. The check valve on the suction side opens and closes due to the negative pressure of the liquid agent applied to the check valve on the suction side due to the reaction force of the fluid flowing through the path against the restoring force of the check valve spring on the suction side and the operation of the piston. Is maintained in the closed state by the restoring force of the discharge side check valve spring, and is directly applied to the positive pressure of the liquid agent applied to the discharge side check valve and the discharge side check valve by the operation of the piston. A washing machine that is forcibly opened by two mechanical forces. The washing machine according to claim 1, wherein the mechanical force directly applied to the discharge side check valve has a structure that synchronizes with the operation of the piston. The washing machine according to claim 2, wherein the piston is integrally provided with a protruding rib that directly pushes the discharge side check valve. The washing machine according to claim 3, wherein the protruding rib has a streamlined structure in which the flow path resistance does not increase. Any of claims 1 to 4 configured such that the spring constants of the suction-side check valve spring and the discharge-side check valve spring are such that the suction-side check valve spring ≤ the discharge-side check valve spring. Or the washing machine described in item 1.

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