CN104120586A - Washing machine with liquid putting device and control method thereof - Google Patents

Abstract

The invention relates to a washing machine equipped with a liquid feeding device and a control method thereof. The liquid feeding device includes: a liquid storage device for storing detergent and/or softener, and an air pump connected with the liquid storage device. A control valve is provided between the liquid storage device and the communication pipeline of the washing tub, and the liquid delivery device also includes a pressure detection unit for detecting the internal pressure of the liquid storage device to send a signal to the washing machine control unit to open the control valve. The control method is as follows: when the pressure value in the liquid storage device rises to the set pressure value with the compressed air input by the air pump, start timing and open the control valve so that the washing liquid and/or softener in the liquid storage device Flow into the washing tub, and close the control valve and the air pump when the timing time T reaches the set delivery time T0. Through the above-mentioned device and method, the phenomenon of timing the feeding time before starting to feed the liquid is avoided, thereby realizing accurate feeding of the washing liquid and/or the softener.

Description

A washing machine equipped with a liquid feeding device and its control method

technical field

The invention relates to a washing machine equipped with a liquid feeding device and a control method thereof in the field of washing machines.

Background technique

The detergent used in the washing process of the existing washing machine is placed separately from the washing machine. There is no detergent adding device on the washing machine, and the detergent cannot be added automatically. This structure cannot realize the automatic washing control process of the washing machine. With the improvement of washing machine automation, most washing machines are set to connect the detergent box for placing detergent or/and softener with the water inlet pipeline, and flush the detergent or/and softener in the detergent box into the washing tub through the water inlet , but this structure must first put detergent or/and softener into the detergent box every time the laundry is done, and also does not realize a full-automatic laundry control process.

In order to realize the purpose of automatic injection of detergent in the washing machine, the commonly used method is to set a flow meter on the injection pipeline between the storage device containing detergent or/and softener and the washing tub to measure the amount of detergent or/and softener. delivery volume. However, there are different degrees of corrosion effects on the existing flowmeter elements due to the ingredients in the detergent or/and softener. Therefore, after a period of use, the flowmeter will fail.

In order to solve the above problems, some solutions that do not use flowmeters to achieve accurate detergent delivery are proposed, for example: Chinese patent application number CN201010243393.0, an automatic detergent delivery device for washing machines. The water inlet pipeline is connected to the water inlet control valve of the washing machine and the distributor box. The detergent container is located at the bottom of the washing machine and communicates with the distributor box through a catheter. The detergent container presses external air into the detergent container through an air pump. , the air pressure in the detergent container rises, and the detergent is lifted into the dispenser box along the catheter. In the above solution, by using the air pump to press the external air into the container, the air pressure in the container increases, and the detergent is lifted into the detergent box along the catheter, so as to realize the purpose of automatically adding detergent. However, in the above solution, the pressure in the detergent container will be at different values due to the different time points when the air pump inputs air into the container, resulting in different flow rates of the detergent in the catheter, thereby reducing the accuracy of the delivery device. Moreover, when the pump just starts to input air into the container, the liquid delivery rate is relatively slow, even before delivery, so the measured delivery time is very inaccurate, which leads to a low accuracy of the delivery amount of the washing machine.

Based on the above needs and shortcomings, the present invention is proposed.

Contents of the invention

The main purpose of the present invention is to provide a washing machine equipped with a liquid feeding device and its control method, so as to realize the purpose of accurately feeding detergent or/and softener during washing.

For realizing the above object, technical scheme of the present invention is:

A washing machine equipped with a liquid feeding device, the liquid feeding device includes: a liquid storage device for storing detergent and/or softener, and an air pump connected to the liquid storage device, the liquid storage device is connected to the washing tub A control valve is arranged between the communicating pipelines. The liquid injection device also includes a pressure detection unit for detecting the internal pressure of the liquid storage device to send a signal to the washing machine control unit to open the control valve.

Further, the liquid storage device is configured to have at least one cavity for containing liquid, and the liquid storage device is respectively provided with a gas inlet connected to the air pump, a liquid outlet connected to the washing tub and a liquid outlet for feeding liquid. A liquid inlet that can be opened and closed. Thus, the user can store detergent and/or softener into the liquid storage device through the opened liquid injection port. When the washing machine needs to use the detergent and/or softener, the detergent and/or softener can flow into the washing tub through the liquid outlet. When the air pump is working, the liquid inlet is in a closed state, and the washing liquid and/or softener in the liquid storage device are submerged in the liquid outlet, so that the liquid storage device forms a closed space that is only connected to the air pump.

Further, the liquid inlet is set on the top of the liquid storage device, and the liquid outlet is set on the bottom of the liquid storage device. Preferably, the liquid inlet is arranged at the highest point on the top surface of the liquid storage device, and the liquid outlet is arranged at the lowest point on the bottom surface of the liquid storage device. Further preferably, the gas inlet is arranged on the top surface of the liquid storage device. Therefore, as long as there is detergent and/or softener stored in the storage device, it will not pass through the liquid outlet, so that the liquid storage device forms a closed space that is only connected to the air pump. By arranging the liquid inlet at the highest point on the top surface of the liquid storage device, the liquid storage device can be filled with detergent and/or softener to maximize the use of the space of the liquid storage device.

Further, the pressure detection unit is arranged at the liquid outlet to detect the pressure value at the liquid outlet. The pressure detection unit transmits the detected pressure value P at the liquid outlet to the control system. The washing tub is connected to the liquid injection port of the liquid storage device through a liquid injection pipe, and a control valve for controlling liquid flow is arranged on the liquid injection pipe. Under the action of the control system, the control valve can be switched between the open state and the closed state, realizing the purpose of using the control valve to control the detergent and/or softener in the liquid storage device to be injected into the washing tub.

A control method for a washing machine equipped with a liquid feeding device as described above, which includes the following steps: when the pressure in the liquid storage device rises to a set pressure value with the compressed air input by the air pump, the control valve is opened to Make the washing liquid and/or softener in the liquid storage device flow into the washing tub, and set the timing time T as the liquid feeding time.

Further, when the washing liquid and/or softening agent are put in, the air pump works first to compress the air in the atmosphere and transfer it into the liquid storage device filled with washing liquid and/or softener, so that the pressure in the liquid storage device increases , the control valve is closed at this time. When the pressure P at the liquid outlet reaches the set pressure value P0, the control valve is opened, the washing liquid and/or softener in the liquid storage device flows into the washing tub, and the timing starts. When the timing time T reaches the set delivery time T0, the air pump and the control valve are closed, and the washing liquid and/or softener are stopped.

Further, when the control valve is opened to allow the washing liquid and/or softener in the liquid storage device to flow into the washing tub, the air pump continues to press air into the liquid storage device.

Further, during the opening process of the control valve, the air pump continuously inputs compressed air corresponding to the flow rate into the liquid storage device, so that the pressure P at the liquid outlet is stabilized at the set pressure value P0.

Further, when the control valve is opened, the timing is started, and the liquid is started to be injected into the washing tub, and the timing time T is measured during this process; the washing liquid and/or Comparing the set delivery time T0 of the softener: when T reaches T0, the control valve is closed and the air pump stops working.

Further, the set delivery time T0 of washing liquid and/or softener is calculated according to the washing program selected by the user and/or different laundry, different washing volumes and the set pressure value P0 at the set liquid outlet . Since the washing liquid and/or softener are put into the washing tub through the liquid delivery pipe, if the inner diameter and length of the delivery pipe are constant, if the pressure at one end of the two ends of the delivery pipe is a certain value, the pressure at the other end will also be the same. If it is a certain value or changes in a certain curve, the flow rate of the fluid in it remains unchanged or changes in a corresponding trend, so that the amount of liquid injected in a fixed time is a certain value and the flow rate at the outlet is a certain value. Based on the above theory, after many experiments, it can be obtained that different washing procedures and/or different laundry items and different washing amounts correspond to the set feeding time T0 of washing liquid and/or softener.

Further, before the air pump starts to compress the air in the atmosphere into the liquid storage device, it is necessary to close the liquid inlet first, and make the washing liquid and/or softener in the liquid storage device not pass through the liquid outlet, so that the liquid storage The device forms a closed space that is only connected to the air pump.

Further, when the washing liquid and/or softener stored in the liquid storage device are fully dispensed, the liquid storage device is connected to the washing drum, and the pressure value P at the liquid outlet changes abruptly and decreases to a pressure value close to atmospheric pressure. At this time, the air pump is stopped, and a signal is sent to the user that the washing liquid and/or the softening agent need to be replenished. Therefore, when the washing liquid and/or the softening agent are consumed, the user is automatically reminded to replenish the washing liquid and/or the softening agent.

Further, the set pressure value P0 is set to different corresponding values according to the concentration and/or viscosity of the washing liquid and/or softener selected by the user. Preferably, different setting pressure values P0 are set according to the characteristics such as the concentration and viscosity of the washing liquid and/or softening agent, so that the washing liquid and/or softening agent in the liquid storage device press a certain pressure when the control valve is opened. The speed is put into the washing drum. Therefore, after many tests, it can be concluded that under different washing procedures and/or different washings and different washing quantities, the set delivery time T0 of washing liquid and/or softener corresponding to different concentrations and viscosities , and stored in the control unit, to be invoked when the washing machine puts washing liquid and/or softener. When the control valve of the washing machine is opened and the washing liquid and/or softener is put in, timing starts, so as to judge by the timing time T and the set throwing time T0, so that the washing machine can accurately inject the washing liquid and/or softener purpose of control.

The beneficial effects of the present invention are: when the pressure value at the liquid outlet of the liquid storage device is at P0, the control valve is opened to start timing when the washing liquid and/or softener are put into the washing tub, thereby avoiding the air pump When the compressed air is just started to be input into the container, the feeding rate of the liquid is relatively slow, and the phenomenon of timing the liquid feeding time even before the feeding starts occurs. Thus, the precise control of the injection time of the washing liquid and/or softening agent is realized, and the air pump is continuously pressed into the liquid storage device while the control valve is opened, so that the washing liquid and/or softening agent are injected according to the two ends of the injection pipe. The flow rate corresponding to the pressure change curve is injected into the washing tub. Then, by judging the measured timing time T with the set delivery time T0 corresponding to the washing program and/or different laundry items and different washing volumes, the purpose of accurately adding detergent and/or softener to the washing machine is achieved . More particularly, the air pump continuously inputs compressed air into the liquid storage device during the opening of the control valve, so that the pressure P at the liquid outlet is stabilized at the set pressure value P0, and the purpose of liquid delivery at a fixed flow rate is achieved. It is also possible to accurately measure the total liquid V of the washing liquid and/or the softener according to the opening time of the control valve, thereby achieving the purpose of accurately dosing the detergent or/and softener.

Instructions attached

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a block flow diagram of the present invention;

Fig. 3 is a preferred flow diagram of the present invention;

Fig. 4 is a further preferred flowchart of the present invention.

Notes in the figure: 1—washing drum, 2—air pump, 3—liquid storage device, 4—liquid inlet, 5—gas inlet, 6—liquid outlet, 7—detergent and/or softener, 8—pressure detection Unit, 9—control valve, 10—liquid delivery pipe.

Detailed ways

Example 1

As shown in Figure 1,

A washing machine equipped with a liquid feeding device, the liquid feeding device includes: a liquid storage device 3 for storing detergent and/or softener 7, and an air pump 2 connected to the liquid storage device 3, the liquid storage device A control valve 9 is provided between the 3 and the washing tub 1, and the liquid injection device also includes a pressure detection unit for detecting the internal pressure of the liquid storage device 3 to send a signal to the washing machine control unit to open the control valve 9 8.

In this embodiment, the liquid storage device 3 is configured to have at least one cavity for containing liquid, and the liquid storage device 3 is respectively provided with gas inlets 5 connected to the air pump 2 and connected to the washing tub 1 The liquid outlet 6 and the openable and closable liquid inlet 4 for injecting liquid. The user can store detergent and/or softener 7 into the liquid storage device 3 through the opened liquid injection port 4 . When the washing machine needs to use the detergent and/or softener 7 , the detergent and/or softener 7 can flow into the washing tub 1 through the liquid outlet 6 . When the air pump 2 is working, the liquid inlet 4 is in a closed state, and the washing liquid and/or softener 7 in the liquid storage device 3 are not passed through the liquid outlet 6, so that the liquid storage device 3 forms a connection only with the air pump 2. hermetic space.

In this embodiment, the liquid inlet 4 is set on the top of the liquid storage device 3 , and the liquid outlet 6 is set on the bottom of the liquid storage device 3 . Preferably, the liquid inlet 4 is set at the highest point on the top surface of the liquid storage device 3 , and the liquid outlet 6 is set at the lowest point on the bottom surface of the liquid storage device 3 . Further preferably, the gas inlet 5 is arranged on the top surface of the liquid storage device 3 . Thereby, as long as the detergent and/or softener 7 are also stored in the storage device 3, the detergent and/or softener 7 will not pass through the liquid outlet 6, so that the liquid storage device 3 is formed only with the air pump 2. Connected confined spaces. By arranging the liquid inlet 4 at the highest point on the top surface of the liquid storage device 3 , the liquid storage device 3 can be filled with detergent and/or softener 7 to maximize the use of the space of the liquid storage device 3 .

In this embodiment, the pressure detection unit 8 is arranged at the liquid outlet 6 to detect the pressure value at the liquid outlet 6 . The pressure detection unit 8 transmits the detected pressure value P at the liquid outlet 6 to the control system, and the control system analyzes and judges to control the opening and closing state of the valve 9 . The control valve 9 is connected with the timing device provided in the control system to detect the timing T. The control system compares the timing time T with the preset feeding time T0 corresponding to each washing program preset in the control system: when T reaches T0, the control valve 9 is closed, and the air pump 2 stops working. Therefore, the washing machine realizes the purpose of precisely controlling the time of adding detergent and/or softener.

In this embodiment, the washing tub 1 is connected to the liquid outlet 6 of the liquid storage device 3 through a liquid delivery pipe 10, and the liquid delivery pipe 10 is provided with a control valve 9 for controlling the liquid flow. Under the action of the control system, when the pressure P at the liquid outlet 6 is the set value P0, the detergent and/or softener 7 in the liquid storage device 3 will be controlled to be put into the washing tub through the opening and closing of the control valve 9 1, to achieve precise dosing of washing liquid and/or softener.

Example 2

as shown in picture 2,

A control method for a washing machine equipped with a liquid feeding device as described in Embodiment 1 above, which includes the following steps: When the pressure value in the liquid storage device 3 rises to a set pressure value with the compressed air input by the air pump 2, start timing And the control valve 9 is opened, so that the washing liquid and/or softener 7 in the liquid storage device 3 flows into the washing tub 1, and the control valve 9 and the air pump 2 are closed when the timing time T reaches the set delivery time T0.

In this embodiment, before starting the feeding, the control unit calls the corresponding set feeding time T0 according to the washing program and the material and quality of the laundry put into the washing tub. When throwing washing liquid and/or softening agent 7, air pump 2 works earlier, the air in the atmosphere is compressed, and pass in the liquid storage device 3 that fills washing liquid and/or softening agent 7, make in the liquid storage device 3 The pressure increases, and the control valve 9 is closed at this time. When the pressure P at the liquid outlet 6 reaches the set pressure value P0, the control valve 9 is opened, the washing liquid and/or softener 7 in the liquid storage device 3 flows into the washing tub 1, and the timing starts. When the timing time T reaches the set delivery time T0, the air pump 2 and the control valve 9 are closed, and the washing liquid and/or the softener 7 are stopped.

In this embodiment, since the washing liquid and/or the softener 7 are put into the washing tub 1 through the liquid feeding pipe 10 . When the inner diameter and length of the delivery tube 10 are constant, if the air pump 2 continues to compress air into the liquid storage device 3 with a certain power, the pressure at both ends of the delivery tube 10 will change according to the set curve, and the fluid will change according to the pressure of the delivery tube 10. The flow rate corresponding to the pressure change curve at the end is injected into the washing drum. Thus, after multiple tests, different washing programs and/or different laundry items, different washing amounts corresponding to the set time T0 of washing liquid and/or softener can be obtained, and stored in the control unit , which is called when the washing machine dispenses detergent and/or softener.

In this embodiment, when the control valve 9 is opened to allow the washing liquid and/or softener 7 in the liquid storage device 3 to flow into the washing tub 1, the air pump 2 continues to compress air into the liquid storage device 3 at a certain power, so that the storage device 3 The air pressure in the liquid device 3 changes according to the set rule.

In this embodiment, during the liquid delivery process, the timing time T is measured; the timing time T is compared with the set delivery time T0 of the washing liquid and/or softener corresponding to the washing program selected by the user: when T reaches T0 When the control valve is closed, the air pump stops working.

In this embodiment, before the air pump 2 compresses the air in the atmosphere into the liquid storage device 3, the liquid injection port 4 needs to be closed first, and the washing liquid and/or softener 7 in the liquid storage device 3 are submerged in the liquid outlet 6, so that the liquid storage device 3 forms a closed space that is only communicated with the air pump 2.

In this embodiment, when the washing liquid and/or softener 7 stored in the liquid storage device 3 are put in completely, the liquid storage device 3 is connected with the washing tub 1, and the pressure value P at the outlet of the liquid changes abruptly and decreases to Pressure values approaching atmospheric pressure. Now the air pump 2 stops working, and sends a signal to the user that the washing liquid and/or softener needs to be replenished, and automatically reminds the user to replenish the washing liquid and/or softener.

By arranging a pressure detection unit at the outlet of the liquid, the control valve can put the stored washing liquid and/or softener into the washing tub when the pressure P at the liquid outlet is the set value P0, thereby realizing the control of the washing liquid. And/or precise control of softener delivery time. At the same time, make the air pump continuously press air into the liquid storage device while the control valve is open, so that the washing liquid and/or softener are injected into the washing tub according to the flow rate corresponding to the pressure change curve at both ends of the injection tube.

When the washing machine injects washing liquid and/or softener, by judging the timing time T and the set input time T0, the effect of accurately injecting detergent and/or softener into the washing machine is achieved.

Example 3

As shown in Figure 3,

A control method for a washing machine equipped with a liquid feeding device as described in Embodiment 1 above, which includes the following steps: When the pressure value in the liquid storage device 3 rises to a set pressure value with the compressed air input by the air pump 2, start timing And the control valve 9 is opened, so that the washing liquid and/or softener 7 in the liquid storage device 3 flows into the washing tub 1, and the control valve 9 and the air pump 2 are closed when the timing time T reaches the set delivery time T0.

In this embodiment, before starting the washing, the control unit invokes the corresponding set feeding time T0 according to the washing program and the material and quality of the laundry put into the washing tub. When the described washing liquid and/or softening agent 7 are put in, the air pump 2 works first, compresses the air in the atmosphere, and passes it into the liquid storage device 3 filled with the washing liquid and/or softening agent 7, so that the liquid storage device The pressure in 3 increases, and the control valve 9 is closed at this time. When the pressure P at the liquid outlet 6 reaches the set pressure value P0, the control valve 9 is opened, the washing liquid and/or softener 7 in the liquid storage device 3 flows into the washing tub 1, and the counting time T is started. When the timing time T reaches the set delivery time T0, the air pump 2 and the control valve 9 are closed, and the washing liquid and/or the softener 7 are stopped.

In this embodiment, when the control valve 9 is opened to allow the washing liquid and/or softener 7 in the liquid storage device 3 to flow into the washing tub 1, the pressure value P at the liquid outlet 6 measured by the pressure detection unit 8 and the set The power of the air pump 2 is generated according to the difference between the pressure value P and the set pressure value P0, so that the amount of compressed air input by the air pump 2 to the liquid storage device is constantly changing, ensuring the pressure The pressure value P at the liquid outlet 6 measured by the detection unit 8 is always maintained at the set pressure value P0. Because when the pressure at both ends of the delivery pipe 10 is a certain value, the flow rate of the washing liquid and/or the softening agent 7 in the pipeline is also a physical characteristic of a certain value, thereby realizing the washing liquid and/or the softening agent 7 at a fixed flow rate. The purpose of feeding into the washing drum.

In this embodiment, the washing liquid and/or softener 7 is put into the washing tub 1 through the liquid feeding pipe 10 . When the inner diameter and length of the delivery tube 10 are constant, if the pressure at both ends of the delivery tube 10 remains constant, the flow velocity of the fluid therein remains constant. The liquid flow rate Q is the liquid flow rate of the washing liquid and/or softener 7 in the delivery tube 10 measured through multiple tests when the pressure at one end is the set pressure P0 and the other end is at atmospheric pressure. Thus, after many tests, different washing programs and/or different laundry items, different washing amounts corresponding to the set delivery time T0 of washing liquid and/or softener can be obtained, and stored in the control unit for Called when the washing machine dispenses detergent and/or softener. When the washing machine injects washing liquid and/or softener, the purpose of accurately controlling the amount of washing liquid and/or softener injected by the washing machine is achieved by judging the input time and the set input time T0.

In this embodiment, during the liquid feeding process, the timing time T is measured; the timing time T is compared with the set feeding time T0 of the washing liquid and/or softener corresponding to the washing program selected by the user: when T=T0 When the control valve is closed, the air pump stops working.

When the pressure value at the liquid outlet of the liquid storage device is at P0, the control valve 9 is opened, so that the washing liquid and/or softener are put into the washing tub at a fixed flow rate, and the detergent is accurately measured according to the timing time T Or/and the delivery time of the softener. Then, by judging the feeding time and the set feeding time T0, the effect of accurately feeding the detergent and/or softener into the washing machine is achieved.

Example 4

As shown in Figure 4,

A control method for a washing machine equipped with a liquid feeding device as described in Embodiment 1 above, which includes the following steps: when the pressure value in the liquid storage device 3 rises to a set pressure value with the compressed air input by the air pump 2, start Time and open the control valve 9 so that the washing liquid and/or softener 7 in the liquid storage device 3 flow into the washing tub 1, and close the control valve 9 and the air pump 2 when the timing T reaches the set delivery time T0.

In this embodiment, the set pressure value P0 is set to different corresponding values according to the concentration and/or viscosity of the washing liquid and/or softener 7 selected by the user. Preferably, different set pressure values P0 are set according to the characteristics such as the concentration and viscosity of the washing liquid and/or the softening agent 7, so that the washing liquid and/or the softening agent in the liquid storage device press A certain feeding speed is put into the washing drum. Therefore, after many tests, it can be obtained that the set delivery time T0 of washing liquid and/or softener corresponding to different concentrations and viscosities corresponding to different washing programs and/or different washings and different washing amounts, and Stored in the control unit for recall when the washing machine dispenses washing liquid and/or softener. When the washing machine injects washing liquid and/or softener, it is judged by timing time T and set input time T0, so that the washing machine can precisely control the amount of washing liquid and/or softener.

In this embodiment, before starting the washing, the control unit invokes the corresponding setting delivery according to the concentration and/or viscosity of the washing liquid and/or the softener 7, the washing program, and the material and quality of the laundry put into the washing tub. Time T0 and set pressure value P0. When throwing washing liquid and/or softening agent 7, air pump 2 works earlier, the air in the atmosphere is compressed, and pass in the liquid storage device 3 that fills washing liquid and/or softening agent 7, make in the liquid storage device 3 The pressure increases, and the control valve 9 is closed at this time. When the pressure P at the liquid outlet 6 reaches the set pressure value P0, the control valve 9 is opened, the washing liquid and/or softener 7 in the liquid storage device 3 flows into the washing tub 1, and the timing starts. When the timing time T reaches the set delivery time T0, the air pump 2 and the control valve 9 are closed, and the washing liquid and/or the softener 7 are stopped. Thus, comparing the timing time T with the corresponding feeding time T0, the purpose of precisely controlling the feeding can be achieved when washing liquids and/or softeners of different concentrations and viscosities are used in the washing machine.

Thereby, by setting corresponding pressure values P0 for washing liquids and/or softening agents of different concentrations and viscosities, it is avoided that different washing liquids and/or softening agents are injected into the washing tub at a slower rate due to too small pressure difference. Slow, or even the occurrence of no delivery. Thus, the accurate measurement of the time T0 of the washing machine for washing liquid and/or softener with different concentrations and viscosities is realized.

It should be noted that the above-mentioned specific embodiments are only exemplary, and under the above-mentioned teaching of the present invention, those skilled in the art can make various improvements and modifications on the basis of the above-mentioned embodiments, and these improvements or modifications fall within the scope of this disclosure. within the scope of protection of the invention.

Those skilled in the art should understand that the above specific description is only for the purpose of explaining the present invention, and is not intended to limit the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A washing machine equipped with a liquid feeding device, the liquid feeding device includes: a liquid storage device (3) for storing detergent and/or softener (7), and a liquid storage device (3) connected An air pump (2), a control valve (9) is provided between the liquid storage device (3) and the communication pipeline of the washing drum (1), It is characterized in that the liquid dispensing device further includes a pressure detection unit (8) for detecting the internal pressure of the liquid storage device (3) to send a signal to the washing machine control unit so as to open the control valve (9). 2. A washing machine equipped with a liquid feeding device according to claim 1, characterized in that: said liquid storage device (3) has at least one cavity for containing liquid; said liquid storage device (3) The gas inlet (5) connected to the air pump (2), the liquid outlet (6) connected to the washing drum (1) and the openable and closed liquid injection port (4) for injecting liquid are respectively arranged on the top . 3. A washing machine equipped with a liquid injection device according to claim 2, characterized in that the pressure detection unit (8) is arranged at the liquid outlet (6) of the liquid storage device (3). 4. A control method for a washing machine equipped with a liquid feeding device according to any one of claims 1-3, characterized in that the pressure value in the liquid storage device (3) rises with the compressed air input by the air pump (2) When the set pressure value is reached, start timing and open the control valve (9) to allow the washing liquid and/or softener (7) in the liquid storage device (3) to flow into the washing tub (1). When the set feeding time T0 is reached, the control valve (9) and the air pump (2) are closed. 5. The control method according to claim 4, characterized in that: when the washing liquid and/or softener (7) is put in, the air pump (2) works first to compress the air in the atmosphere and transfer it into the washing liquid. and/or the liquid storage device (3) of the softener (7), the pressure in the liquid storage device (3) is increased, and the control valve (9) is closed at this time; When the pressure P at the liquid outlet (6) reaches the set pressure value P0, the control valve (9) opens and starts timing, allowing the washing liquid and/or softener (7) in the liquid storage device (3) to flow into the washing drum (1); When the timing time T reaches the set delivery time T0, the air pump (2) and the control valve (9) are closed, and the washing liquid and/or softener (7) is stopped. 6. The control method according to claim 4, characterized in that: when the control valve (9) is opened to allow the washing liquid and/or softener (7) in the liquid storage device (3) to flow into the washing tub (1) , the air pump (2) continuously presses air into the liquid storage device (3). 7. The control method according to claim 6, characterized in that: during the opening process of the control valve (9), the air pump (2) continuously inputs compressed air corresponding to the flow rate into the liquid storage device (3), so that the liquid exits The pressure P at (6) is stable at the set pressure value P0. 8. The control method according to claim 4, characterized in that: start timing when the control valve (9) is opened, so that the liquid starts to be poured into the washing tub, and the timing time T is measured during this process; the timing time T is compared with the set time T0 of washing liquid and/or softener (7) corresponding to the washing program selected by the user: when T reaches T0, the control valve (9) is closed and the air pump (2) stops working. 9. The control method according to claim 5, characterized in that: the set time T0 of washing liquid and/or softener (7) is set according to the washing program selected by the user and/or different laundry, different washing The volume and the set pressure value P0 at the set liquid outlet are calculated. 10. The control method according to claim 5, characterized in that: the set pressure value P0 is set to correspond to the concentration and/or viscosity of the washing liquid and/or softener (7) selected by the user different values of .