CN114644382A - Water purifier and water purifier control method - Google Patents

Abstract

The invention provides a water purifier and a control method of the water purifier. The water purifier comprises a main water pipeline and a concentrated water pipeline, wherein a booster pump, a pressure detector and a reverse osmosis filter element are sequentially arranged on the main water pipeline along the water flow direction; a water discharge electromagnetic valve is arranged on the concentrated water pipeline. The water purifier also comprises a controller which is electrically connected with the booster pump, the pressure detector and the water discharge electromagnetic valve. The controller is used for controlling the drainage electromagnetic valve to be opened for a first time period when receiving an electric signal indicating that water taking is stopped; and when the pipeline pressure detected by the pressure detector is increased to be not lower than a first pressure preset value, controlling the booster pump to stop working. The purifier can control the booster pump stop work through pressure detector, and is more intelligent. Not only ideally ensures that a user can take water immediately, but also does not damage the reverse osmosis filter element.

Description

Water purifier and water purifier control method

technical field

The present invention relates to the technical field of water purification, in particular, to a water purifier and a control method thereof.

Background technique

With the public's pursuit of quality of life, the level of water quality has begun to attract attention. Water purifiers are becoming more and more popular because the purified water they produce is fresher, more hygienic, and safer.

Most of the water purifiers in the prior art filter the raw water through a reverse osmosis filter element. When the filtration of the water purifier ends, the booster pump stops working, and the water purifier enters the standby stage. Because the booster pump stops working, the pre-membrane pressure of the reverse osmosis filter element in the standby stage is significantly lower than the pre-membrane pressure when it is working. When the user takes water next time, the booster pump starts, and the pressure in the reverse osmosis filter element needs to be increased first to prepare pure water, so the user needs to wait for a while when taking water.

In order to avoid this phenomenon, some water purifiers control the booster pump to continue to work for a certain period of time at the end of filtration. During the time period when the booster pump stops working after a delay, the pressure in the reverse osmosis filter element increases. In this way, the user can save the time of waiting for the booster pump to increase the pressure in the reverse osmosis filter element when the user takes water next time, and can immediately take in the water. However, the method of controlling the booster pump to stop working based on time delay and increasing the pressure in the reverse osmosis filter element is difficult to achieve the expected effect, and sometimes the reverse osmosis filter element is damaged.

SUMMARY OF THE INVENTION

In order to at least partially solve the problems in the prior art, according to one aspect of the present invention, a water purifier is provided, comprising a main water pipeline connected between a water inlet and a water intake of the water purifier, and the main water pipeline A booster pump and a reverse osmosis filter element are arranged in sequence along the water flow direction on the road. The water purifier also includes a concentrated water pipeline connected between the concentrated water outlet of the reverse osmosis filter element and the water outlet of the water purifier. The water purifier also includes a pressure detector. , Drainage solenoid valve and controller, the pressure detector is arranged on the main water pipeline between the booster pump and the reverse osmosis filter element; the drainage solenoid valve is arranged on the concentrated water pipeline; the controller is electrically connected to the booster pump, the pressure detector and the drainage solenoid valve; the controller is used to control the drain solenoid valve to open for a first period of time when receiving an electrical signal indicating stop taking water; when the pipeline pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure, control The booster pump stops working.

The water purifier can flush the reverse osmosis filter element when the water is stopped, which not only ensures the cleanliness of the filter membrane, but also ensures that the TDS value of the first section of the water received by the user is low. A pressure detector is set between the booster pump and the reverse osmosis filter element, and the working time of the booster pump after water intake is controlled by the result of the pressure detection. Compared with the prior art that controls the stop of the booster pump based on time, this is more intelligent, and can ensure that the water purifier enters the standby stage after the pressure of the reverse osmosis filter element reaches the first predetermined pressure value. Thus, it is ensured that the user can take water immediately. Moreover, it is also avoided that the pressure in the reverse osmosis filter element has reached the first predetermined pressure value and the booster pump continues to work, which will cause damage to the reverse osmosis filter element.

Exemplarily, the controller is further configured to control the booster pump to start when the line pressure detected by the pressure detector drops below a predetermined value of the first pressure.

The controller not only controls the activation of the booster pump based on the electric signal from the water intake control device indicating the start of water intake, but also controls the activation of the booster pump based on the electric signal from the pressure detector. In the case of being in the standby stage for a long time, the pressure in the reverse osmosis filter element may gradually decrease, and even eventually cause the pressure in the reverse osmosis filter element to be equal to the pressure in the upstream water path of the booster pump. In this way, when the water is drawn next time, the water purifier still needs to raise the pressure of the reverse osmosis filter element and the pipeline where it is located before the water is discharged. The water purifier with this setting can start the booster pump after detecting that the pressure in the pipeline decreases, so that the downstream pipeline can be boosted to reach the first predetermined pressure value, which further ensures that the user can immediately access the water when taking water. water, improving the user experience.

Illustratively, the pressure detector is the first pressure switch. The first pressure switch is used to realize the pressure detector, so that the water purifier has low cost and stable operation.

Exemplarily, the main water pipeline is further provided with a first check valve, the water inlet of the first check valve is connected to the water outlet of the booster pump, and the water outlet of the first check valve is connected to the water inlet of the pressure detector.

By arranging the first check valve between the booster pump and the pressure detector, the pressure-holding time can be prolonged and the pressure-holding effect can be improved. This ensures that users can always access pure water at the first time.

Exemplarily, the water purifier further includes: a water intake control device disposed on the main water pipeline downstream of the reverse osmosis filter element, the water intake control device is electrically connected to the controller, and the water intake control device is used to generate and send to the controller electricity indicating that water intake is stopped. Signal.

The water purifier with the water intake control device can independently send an electrical signal to the controller indicating that water intake is stopped, so that the control of the water purifier can be more flexible, the control methods can be more diverse, and the use range of the water purifier can be improved.

Exemplarily, the water intake control device includes a second pressure switch, and the second predetermined pressure value of the second pressure switch is smaller than the first predetermined pressure value; the main water pipeline is further provided with a second check valve, and the water inlet of the second check valve is The pure water port of the reverse osmosis filter element is communicated, and the water outlet of the second check valve is communicated with the water inlet of the second pressure switch.

During the flushing process, due to the existence of the second check valve, the pressure in the pipeline where the second pressure switch is located will not decrease due to the opening of the drain solenoid valve, but maintain the original pressure; and the pressure of the second pressure switch The second predetermined pressure value is smaller than the first predetermined pressure value, which can ensure clear control logic of the water purifier and ensure stable operation of the water purifier.

Exemplarily, the first predetermined pressure value is greater than or equal to 0.4 MPa and less than or equal to 0.5 MPa, and the second predetermined pressure value is greater than or equal to 0.2 MPa and less than or equal to 0.3 MPa.

The setting of the above-mentioned first pressure preset value can ensure that the water purifier maintains a certain high pressure in the pipeline during the standby stage. . In addition, the predetermined value of the first pressure will not exceed the maximum pressure of the pipeline and the seal, which can reduce the risk of water leakage. The setting of the second pressure preset value can ensure that the booster pump can continue to work after the water purifier stops taking water, so that there is room for the pressure in the pipeline to continue to rise. At the same time, the second pressure preset value can also ensure that It is higher than the maximum pressure in the tap water pipeline, so that when the user opens the water outlet device, the booster pump can be started normally.

Exemplarily, the water intake control device is an electronically controlled faucet, and the electronically controlled faucet is provided at the water intake.

The electronic control faucet can be regarded as a collection of the water device and the water intake control device, which can improve the integration of the water intake control device and the water outlet device, and only set the electronic control faucet separately at the water intake, which can also reduce the water leakage. , reduce the risk of water leakage.

Exemplarily, the water purifier further includes a water inlet solenoid valve, the water inlet solenoid valve is arranged on the main water pipeline between the water inlet and the booster pump, the water inlet solenoid valve is electrically connected to the controller, and the controller is also used to control the booster pump. When the pressure pump is started, the water inlet solenoid valve is controlled to open, and when the booster pump is controlled to stop working, the water inlet solenoid valve is controlled to be closed.

The water inlet solenoid valve can cut off the main water pipeline upstream of the booster pump when the water purifier is in standby, so as to avoid the phenomenon of ion diffusion in the water during long-term standby, and prevent the unfiltered raw water from moving to the reverse osmosis filter element , causing the water in the reverse osmosis filter element and its downstream waterways to be polluted.

Exemplarily, the water purifier further includes a concentrated water combination valve, the concentrated water combination valve is arranged on the concentrated water pipeline, and the concentrated water combination valve includes a waste water ratio device and a concentrated water solenoid valve in parallel, and the concentrated water solenoid valve is electrically connected to the controller to control the concentrated water. The device is also used to: control the concentrated water solenoid valve to open when receiving the electrical signal indicating stop taking water; when receiving the electrical signal indicating starting to take water or when the pipeline pressure detected by the pressure detector rises to not lower than the first When the pressure is at a predetermined value, the concentrated water solenoid valve is controlled to close.

The water purifier with the concentrated water combination valve can freely switch the water production and flushing of the reverse osmosis filter element, and the control method is simple and easy to realize.

Illustratively, the first period of time is greater than or equal to 10 seconds and less than or equal to 30 seconds.

The setting of the first time period above can make the booster pump continue to work for a certain period of time after the controller receives the signal to stop taking water and electricity. Under the premise of ensuring the water quality of the next water intake, it not only saves water resources, but also ensures reverse osmosis. Filter cleaning.

Exemplarily, the predetermined value of the first pressure is greater than or equal to 0.4 MPa and less than or equal to 0.5 MPa.

The above-mentioned predetermined first pressure value is higher than the filtration pressure value of the reverse osmosis filter element, so that the water purifier can maintain a certain high pressure in the pipeline in the standby stage. Flows out quickly without waiting. In addition, the predetermined value of the first pressure will not exceed the maximum pressure of the pipeline and the seal, which can reduce the risk of water leakage.

According to another aspect of the present invention, a method for controlling a water purifier is provided. The water purifier includes a main water pipeline connected between a water inlet and a water intake of the water purifier, and the main water pipeline is sequentially arranged along the water flow direction. There is a booster pump and a reverse osmosis filter element. The water purifier also includes a concentrated water pipeline connected between the concentrated water outlet of the reverse osmosis filter element and the drain port of the water purifier. The water purifier also includes a pressure detector and a drain solenoid valve. The detector is arranged on the main water pipeline between the booster pump and the reverse osmosis filter element; the drain solenoid valve is arranged on the concentrated water pipeline; the control method includes: when receiving an electrical signal indicating that water intake is stopped, controlling the drain solenoid valve to open for the first time and control the booster pump to stop working when the pipeline pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure.

Exemplarily, the control method further includes: when the line pressure detected by the pressure detector drops below a predetermined value of the first pressure, controlling the booster pump to start.

Exemplarily, the water purifier further includes a water inlet solenoid valve, and the water inlet solenoid valve is arranged on the main water pipeline between the water inlet and the booster pump; the control method further includes: while controlling the booster pump to start, controlling the water inlet The solenoid valve is opened; and at the same time that the booster pump is controlled to stop working, the water inlet solenoid valve is controlled to be closed.

Exemplarily, the water purifier further includes: a water intake control device disposed on the main water pipeline downstream of the reverse osmosis filter element, the water intake control device is electrically connected to the controller, and the control method further includes: receiving electricity from the water intake control device indicating that water intake is stopped; Signal.

Exemplarily, the control method further includes: receiving an electric signal indicating the start of water intake from the water intake control device, and when receiving the electric signal indicating the start of water intake, controlling the booster pump to start.

A series of concepts in simplified form have been introduced in this Summary, which are described in further detail in the Detailed Description. The summary of the present invention is not intended to attempt to limit the key features and necessary technical features of the claimed technical solution, much less to determine the protection scope of the claimed technical solution.

The advantages and features of the present invention will be described in detail below with reference to the accompanying drawings.

Description of drawings

The following drawings of the present invention are incorporated herein as a part of the present invention for understanding of the present invention. The accompanying drawings illustrate the embodiments of the present invention and their description, which serve to explain the principles of the present invention. In the attached drawings,

1 is a schematic diagram of a water circuit of a water purifier according to an exemplary embodiment of the present invention; and

FIG. 2 is a block diagram of a work flow of a water purifier according to an exemplary embodiment of the present invention.

Wherein, the above-mentioned drawings include the following reference signs:

100, water purifier; 101, water inlet; 102, water intake; 103, water outlet; 200, main water pipeline; 210, booster pump; 220, reverse osmosis filter element; 221, raw water inlet; 222, pure water outlet; 223, concentrated water outlet; 230, water inlet solenoid valve; 240, pre-filter; 300, concentrated water pipeline; 310, drain solenoid valve; 320, concentrated water combination valve; 321, waste water ratio device; 322, concentrated water solenoid valve; 410, the first pressure switch; 420, the second pressure switch; 510, the first check valve; 520, the second check valve.

Detailed ways

In the following description, numerous details are provided in order to enable a thorough understanding of the present invention. It will be appreciated by those skilled in the art, however, that the following description is merely illustrative of preferred embodiments of the invention and that the invention may be practiced without one or more of these details. Furthermore, some technical features known in the art are not described in detail in order to avoid confusion with the present invention.

As mentioned above, in the existing water purifier, the time-based control of the booster pump to delay the stop of operation reduces the waiting time for the user to receive water. However, in different application scenarios, the water pressure of the pipeline where the water purifier is located is different; even for the same water purifier, the pipeline pressure in which it is located may be unstable, that is, it changes over time. . Therefore, for the above-mentioned existing water purifiers, sometimes, the booster pump stops working when the pressure in the reverse osmosis filter element does not reach the desired pressure predetermined value, which makes the user still need to wait for a period of time when receiving water next time. It can achieve the expected effect; sometimes, the pressure in the reverse osmosis filter element has reached the desired pressure predetermined value, but because the predetermined time period has not arrived, the booster pump continues to work, but instead causes damage to the reverse osmosis filter element, reducing reverse osmosis The working life of the filter element.

FIG. 1 shows a water purifier 100 according to one embodiment of the present invention. The water purifier 100 has a water inlet 101 and a water intake 102 . Usually, the water inlet 101 can be used to connect water sources such as municipal water pipes. The water intake 102 can be used to communicate with the water outlet. The water outlet device may include faucets, pipeline machines and other equipment. The main water pipeline 200 is connected to the water inlet 101 and the water intake 102 of the water purifier. The main water pipeline 200 is provided with a booster pump 210 and a reverse osmosis filter element 220 in sequence along the water flow direction from the water inlet 101 to the water intake 102 . The booster pump 210 is used to supply water to the reverse osmosis filter element 220 . The reverse osmosis filter element 220 is used to filter the passing water flow.

The water purifier 100 further includes a concentrated water pipeline 300 . The concentrated water pipeline 300 is communicated between the concentrated water port 223 of the reverse osmosis filter element 220 and the drain port 103 of the water purifier 100 . The concentrated water pipeline 300 is used to discharge the concentrated water that is not filtered by the reverse osmosis filter element 220 out of the water purifier 100 .

The water purifier also includes a pressure detector, a drain solenoid valve 310 and a controller. A pressure detector can send an electrical signal based on the pressure in the line where it is located. The pressure detector is arranged on the main water pipeline 200 between the booster pump 210 and the reverse osmosis filter element 220 . The drain solenoid valve 310 is arranged on the concentrated water pipeline 300 . The drain solenoid valve 310 can have two states: open and closed. When it is in the closed state, the pipeline where it is located is completely blocked. The controller is electrically connected to the booster pump 210 , the pressure detector and the drain solenoid valve 310 for controlling operable devices such as the booster pump 210 and various solenoid valves such as the drain solenoid valve 310 according to electrical signals from such as the pressure detector. The controller can be built with electronic components such as timers, comparators, registers, and digital logic circuits, or it can be built with single-chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), and field programmable controllers. Gate Array (FPGA), Programmable Logic Array (PLA), Application Specific Integrated Circuit (ASIC) and other processor chips and their peripheral circuits are implemented.

Exemplarily, the water purifier may include an electronically controlled faucet, which is provided at the water intake 102 . When the electronically controlled faucet is turned on, the controller will receive an electrical signal from the electronically controlled faucet indicating the start of water intake, and then control the booster pump 210 to start. The booster pump 210 supplies water to the reverse osmosis filter element 220, and the reverse osmosis filter element 220 filters the water flowing therethrough. The drain solenoid valve 310 is in a closed state to ensure that the pressure in the reverse osmosis filter element 220 is at a high level, thereby ensuring that the reverse osmosis filter element 220 can perform the filtering operation smoothly. Users can access filtered pure water through the water outlet. During this process, the water purifier is in the state of making water. When the electronically controlled faucet is closed, the controller will receive an electrical signal from the electronically controlled faucet indicating stop taking water, and then control the drain solenoid valve 310 to open for the first time period T1. During the first time period T1 when the drain solenoid valve 310 is opened, the concentrated water port 223 of the reverse osmosis filter element 220 is completely communicated with the drain port 103 . Therefore, the water discharged from the booster pump 210 will enter through the raw water port 221 of the reverse osmosis filter element 220, and will be completely discharged from the water outlet 103 through the concentrated water port 223 thereof. During the first time period T1 , the filter membrane of the reverse osmosis filter element 220 will be flushed by the water flow pressed by the booster pump 210 . On the one hand, it avoids the deposition of microorganisms and other impurities on the filter membrane and reduces the life of the reverse osmosis filter; high. After the first time period T1 is reached, the drain solenoid valve 310 is closed by receiving the control signal from the controller.

The first time period T1 may be greater than or equal to 10 seconds and less than or equal to 30 seconds. The above-mentioned setting of the first time period T1 can make the booster pump 210 continue to work for a certain period of time after the controller receives the signal to stop taking water and electricity. On the premise of ensuring the water quality of the next water intake, it not only saves water resources, but also guarantees Cleaning of the reverse osmosis filter element 220.

The booster pump 210 continues to work. Since the main water pipeline 200 is blocked by the water outlet device and the concentrated water pipeline 300 is blocked by the drain solenoid valve 310, the pressure in the reverse osmosis filter element 220 and its pipeline will rise rapidly. When the pressure detector detects that the pressure of the pipeline in which it is located has risen to not lower than the first predetermined pressure value P1, the controller controls the booster pump 210 to stop working according to the electrical signal sent by the pressure detector, and the water purifier 100 enters. Standby phase. Preferably, the first predetermined pressure value P1 may be greater than or equal to 0.4 MPa and less than or equal to 0.5 MPa. The above-mentioned first predetermined pressure value P1 is higher than the filtration pressure value of the reverse osmosis filter element 220, which can make the water purifier 100 maintain a certain high pressure in the pipeline in the standby stage, and this high pressure can ensure that the next time it enters the water intake stage, the water outlet device is turned on. , the water flow out quickly, no need to wait. In addition, the predetermined first pressure value P1 will not exceed the maximum pressure of the pipeline and the seal, which can reduce the risk of water leakage.

In the standby stage, since the concentrated water pipeline 300 is still blocked by the drain solenoid valve 310, the reverse osmosis filter element 220 will always maintain the first predetermined pressure value P1.

In the above water purifier 100, the reverse osmosis filter element 220 can be flushed when the water intake is stopped, which not only ensures the cleanliness of the filter membrane, but also ensures that the TDS value of the first stage water received by the user is low. A pressure detector is arranged between the booster pump 210 and the reverse osmosis filter element 220, and the working time of the booster pump 210 after water intake is controlled by the result of the pressure detection. Compared with the prior art that controls the stop of the booster pump 210 based on time, this is more intelligent, and can ensure that the water purifier 100 enters the standby stage after the pressure of the reverse osmosis filter element 220 reaches the first predetermined pressure value P1 . Thus, it is ensured that the user can take water immediately. Moreover, it is also avoided that the pressure in the reverse osmosis filter element 220 has reached the first predetermined pressure value P1 and the booster pump 210 continues to work, thereby causing damage to the reverse osmosis filter element 220 .

Exemplarily, the water purifier further includes a water intake control device disposed on the main water pipeline 200 downstream of the reverse osmosis filter element 220 . The water intake control device is electrically connected with the controller. The water intake control device is used for generating and sending the above-mentioned electrical signal to the controller indicating that the water intake is stopped. In the above embodiment, the electronically controlled faucet can be regarded as an aggregate of the water outlet device and the water intake control device, that is, the electronically controlled faucet is used to realize both the water outlet device and the water intake control device. When the electric faucet is turned off, an electrical signal will be sent to the controller indicating that water withdrawal is stopped.

The water purifier with the water intake control device can independently send an electrical signal to the controller indicating that water intake is stopped, so that the control of the water purifier can be more flexible, the control methods can be more diverse, and the use range of the water purifier can be improved.

Exemplarily, the water withdrawal control device may also be used to generate and send to the controller an electrical signal indicative of the start of water withdrawal. In the aforementioned embodiment in which the water intake control device is implemented by using an electronically controlled faucet, when the electronically controlled faucet is turned on, it can send an electrical signal to the controller indicating that water intake is started. The controller can also be used to control the booster pump 210 to start when the self-water intake control device receives an electrical signal indicating the start of water intake. It can be understood that the use of the electrical signal from the water intake control device indicating the start of water intake to control the activation of the booster pump 210 is only an example. The booster pump 210 can also be activated under the triggering of other control devices or sensors, which is not limited in the present invention.

Exemplarily, the controller is further configured to control the booster pump 210 to start when the line pressure detected by the pressure detector drops below the first predetermined pressure value P1. In other words, in this example, the controller may control the booster pump 210 to activate based on the electrical signal from the pressure detector. During the normal use of the water purifier, affected by the processing accuracy of each device on the pipeline and the properties of the device itself, the pressure in the reverse osmosis filter element 220 may gradually decrease when it is in the standby stage for a long time, and even eventually As a result, the pressure in the reverse osmosis filter element 220 is equal to the pressure in the upstream water channel of the booster pump 210 . In this way, when the water is drawn next time, the water purifier 100 still needs to increase the pressure of the reverse osmosis filter element 220 and the pipeline where it is located before water is discharged. In this example, once the pressure detector detects that the pressure of the pipeline where it is located is lower than the first predetermined pressure value P1, the controller starts the booster pump 210. After the pressure rises to the first predetermined pressure value P1, the booster pump 210 is controlled again to stop, and the water purifier enters the standby stage again. Therefore, even if the user has not drawn water for a long time, the water purifier 100 can still ensure that the user can immediately receive water when drawing water, which improves user experience.

Illustratively, the pressure detector may be the first pressure switch 410 . The working principle of the first pressure switch 410 is to turn off when the pressure of the pipeline in which it is located reaches its predetermined pressure value, and to conduct when the pressure is lower than its predetermined pressure value. The disconnection and conduction of the first pressure switch 410 both send electrical signals to the controller, and the controller then controls other devices accordingly according to the received electrical signals. The first pressure switch 410 is used to realize the pressure detector, so that the water purifier 100 has low cost and stable operation.

Exemplarily, the main water pipeline 200 is further provided with a first check valve 510 . The water inlet of the first check valve 510 is connected to the water outlet of the booster pump 210, and the water outlet of the first check valve 510 is connected to the water inlet of the pressure detector. If the first check valve 510 is not provided, in the standby stage, the water inlet of the pressure detector will directly communicate with the booster pump 210. The booster pump 210 is affected by its own structure, although in the startup state, it may affect the downstream pipes. However, when the booster pump 210 stops working, the sealing effect is poor, and the pressure maintaining effect is not good, and the pressure in the pipeline where the pressure detector is located is likely to be lost. By arranging the first check valve 510 between the booster pump 210 and the pressure detector, the pressure maintaining time can be prolonged and the pressure maintaining effect can be improved. This ensures that users can always access pure water at the first time.

Exemplarily, the aforementioned water intake control device includes the second pressure switch 420 . The working principle of the second pressure switch 420 is the same as that of the first pressure switch 410 , which will not be repeated here. The main water pipeline 200 is also provided with a second check valve 520 . The water inlet of the second check valve 520 is connected to the pure water port 222 of the reverse osmosis filter element 220 , and the water outlet of the second check valve 520 is connected to the water inlet of the second pressure switch 420 . Similar to the first pressure switch 410 having the first predetermined pressure value P1, the second pressure switch 420 has the second predetermined pressure value P2. Wherein, the second predetermined pressure value P2 of the second pressure switch 420 is smaller than the first predetermined pressure value P1. Optionally, when the first predetermined pressure value P1 is 0.4-0.5 Mpa, the second predetermined pressure value P2 may be 0.2 MPa-0.3 MPa. The setting of the second predetermined pressure value P2 can ensure that the booster pump 210 can continue to work after the water purifier 100 stops taking water, so that there is room for the pressure in the pipeline to continue to rise. P2 can also be guaranteed to be higher than the highest pressure in the tap water pipeline, so that when the user opens the water outlet device, the booster pump 210 can be started normally.

When the user stops taking water, the pressure of the pipeline where the second pressure switch 420 is located increases, the pressure first reaches the second predetermined pressure value P2, and the second pressure switch 420 is turned off. The controller receives an electrical signal from the second pressure switch 420 indicating stop taking water, and then controls the drain solenoid valve 310 to open, and makes the concentrated water pipeline conduct for the first time period T1. The same as the above process, the reverse osmosis filter element 220 is flushed by the booster pump 210 . It can be understood that during the flushing process, due to the existence of the second check valve 520, the pressure in the pipeline where the second pressure switch 420 is located will not decrease due to the opening of the drain solenoid valve 310, but maintain the original pressure. After the first time period T1 is reached, the drain solenoid valve 310 is closed by receiving a control signal from the controller, and the concentrated water pipeline 300 is cut off. The booster pump 210 continues to work, and the pressure of the pipeline downstream of the booster pump 210 gradually rises to the first predetermined pressure value P1. When the pressure reaches the first predetermined pressure value P1, the first pressure switch 410 is turned off. After receiving the electrical signal from the first pressure switch 410, the controller controls the booster pump 210 to stop working, and the water purifier enters the standby stage.

Therefore, by setting the first pressure switch 410 and the second pressure switch 420 at the same time, an electrical signal for controlling the booster pump 210 to stop working and an electrical signal for stopping water intake can be respectively sent to the controller. The second predetermined pressure value P2 of the second pressure switch is smaller than the first predetermined pressure value P1, which can ensure that the control logic of the water purifier 100 is clear and the water purifier works stably.

Exemplarily, the water purifier 100 further includes a water inlet solenoid valve 230 . The water inlet solenoid valve 230 is arranged on the main water pipeline 200 between the water inlet 101 and the booster pump 210 . The water inlet solenoid valve 201 is electrically connected to the controller, and the controller is also used to control the water inlet solenoid valve 230 to open while controlling the booster pump 210 to start, and control the water inlet solenoid valve while controlling the booster pump 210 to stop working. 230 closes. That is, the water inlet solenoid valve 230 and the booster pump 210 can act synchronously. The water inlet solenoid valve 230 can cut off the main water pipeline 200 upstream of the booster pump 210 when the water purifier 100 is in standby, so as to avoid the phenomenon of ion diffusion in the water during long-term standby, and prevent the unfiltered raw water from being reversed. The movement of the osmosis filter element 220 causes the water in the reverse osmosis filter element 220 and its downstream water channels to be polluted.

Exemplarily, the water purifier 100 further includes a pre-filter 240 . The pre-filter element 240 is arranged on the main water pipeline 200 between the water inlet solenoid valve 230 and the booster pump 210 . The pre-filter 240 can preliminarily filter the raw water entering the booster pump 210, and can block the sediment, iron filings, organisms, etc. in the raw water upstream of the pre-filter 240 to prevent impurities from reacting to the downstream booster pump 210. The permeate filter element 220 caused damage.

Exemplarily, the water purifier 100 further includes a concentrated water combination valve 320 . The concentrated water combination valve 320 is disposed on the concentrated water pipeline 300 , and the concentrated water combination valve 320 includes a waste water ratio device 321 and a concentrated water solenoid valve 322 . In one embodiment, the waste water ratio device 321 and the concentrated water solenoid valve 322 are connected in parallel in the concentrated water combination valve 320 . The concentrated water combination valve 320 may be in a shut-off state and a fully-on state. During the normal water production stage of the water purifier 100, the concentrated water combination valve 320 is in a shut-off state. At this time, the concentrated water solenoid valve 322 is closed, and the reverse osmosis filter element 220 discharges the concentrated water through the waste water ratio device 321 . Due to the interception of the waste water ratio device 321, the pressure in the reverse osmosis filter element 220 can be increased to filter the raw water. It can be understood that the concentrated water solenoid valve 322 can be electrically connected to the controller. Optionally, the controller can also be used to control the concentrated water solenoid valve 322 to close when receiving an electrical signal indicating that water is stopped and started to draw water, so as to ensure that the concentrated water solenoid valve 322 is closed during the water production process of the water purifier 100 this time. . Alternatively, the controller may also be configured to control the concentrated water solenoid valve 322 to close when the pipeline pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure. When the pipeline pressure detected by the pressure detector rises to not lower than the first predetermined pressure value, it indicates that both the water production stage and the flushing stage have ended. In the process of making water, the waste water ratio device 321 is used to intercept the concentrated water. During the flushing stage of the water purifier 100, the concentrated water combination valve 320 is in a fully conducting state. At this time, the concentrated water solenoid valve 322 is opened, and the water entering the reverse osmosis filter element 220 will be quickly discharged through the concentrated water solenoid valve 322 , thereby cleaning the reverse osmosis filter element 220 . Optionally, the controller may also be configured to control the concentrated water solenoid valve 322 to open when receiving an electrical signal indicating that water withdrawal is stopped. When the controller receives an electrical signal indicating stop taking water, indicating that the water production stage has ended and is about to enter the flushing stage, the controller can control the concentrated water solenoid valve 322 to open to ensure the smooth completion of flushing.

Therefore, the water purifier with the concentrated water combination valve 320 can freely switch between water production and flushing of the reverse osmosis filter element 220, and the control method is simple and easy to implement.

According to another aspect of the present invention, there is provided a control method for the above water purifier. The water purifier includes a main water pipeline connected between the water inlet and the water intake of the water purifier, and a booster pump and a reverse osmosis filter element are arranged in sequence along the water flow direction on the main water pipeline. The water purifier also includes a reverse osmosis filter element connected to the water purifier. The concentrated water pipeline between the concentrated water outlet of the water purifier and the drainage outlet of the water purifier, the water purifier also includes a pressure detector and a drainage solenoid valve, and the pressure detector is arranged on the main water pipeline between the booster pump and the reverse osmosis filter element; The solenoid valve is arranged on the concentrated water pipeline.

The control method includes the following steps. When receiving the electrical signal indicating stop taking water, control the drain solenoid valve 310 to open for a first period of time T1; and when the pipeline pressure detected by the pressure detector rises to not lower than the first predetermined pressure value P1, control the pressurization Pump 210 stops working.

Exemplarily, the control method may further include: controlling the booster pump 210 to start when the line pressure detected by the pressure detector drops below the first predetermined pressure value P1.

As mentioned above, the water purifier 100 may further include the water inlet solenoid valve 230 . The water inlet solenoid valve 230 is arranged on the main water pipeline 200 between the water inlet 101 and the booster pump 210 . Exemplarily, the control method may further include: controlling the booster pump 210 to start, controlling the water inlet solenoid valve 230 to open; and controlling the booster pump 210 to stop working, controlling the water inlet solenoid valve 230 to close.

Exemplarily, the water purifier 100 further includes a water intake control device disposed on the main water pipeline 200 downstream of the reverse osmosis filter element 220, the water intake control device is electrically connected to the controller, and the control method further includes: receiving a stop signal from the water intake control device. The electric signal of taking water is used to control the drain solenoid valve according to the electric signal.

Exemplarily, the control method further includes receiving an electrical signal indicating the start of taking water from the water taking control device, and controlling the booster pump 210 to start when receiving the electrical signal indicating the beginning of taking water.

Those of ordinary skill in the art can understand the implementation process of each step of the above control method and the corresponding technical effects by reading the above description of the water purifier 100 in conjunction with FIG. 1 , which will not be repeated here for brevity.

FIG. 2 shows a flowchart of a control method of a water purifier according to a specific embodiment of the present invention. A complete and detailed description of the control method is given below with reference to FIG. 2 .

The user first turns on the water outlet device of the water purifier, such as turning on the electronically controlled faucet. The water purifier enters the water intake stage S1, and the controller receives an electrical signal from the water intake control device indicating the start of water intake. After receiving the electrical signal, the controller controls the booster pump 210 to start, and also controls the water inlet solenoid valve 230 to open. The water purifier 100 starts to produce water.

When the user closes the water outlet device, for example, turns off the electronically controlled faucet, the controller receives an electrical signal from the water intake control device indicating that water intake is stopped. After receiving the electrical signal, the controller controls the concentrated water solenoid valve 322 and the drain solenoid valve 310 to open, the booster pump 210 continues to work, and the water purifier enters the flushing stage S2. The duration of the flushing phase S2 is the first time period T1. After the flushing stage S2 ends, the controller controls the concentrated water solenoid valve 322 and the drain solenoid valve 310 to close, the booster pump 210 continues to work, and the water purifier enters the boosting stage S3. The end time of the boosting stage S3 is determined by the detection result of the pressure detector on the pipeline. If the pressure P0 of the pipeline where the pressure detector is located reaches the first predetermined pressure value P1, the controller controls the booster pump 210 to stop working, the water purifier 100 enters the standby stage S4, the booster pump 210 stops working, and the water inlet solenoid valve 230 stops working. closure.

Wherein, when the water purifier is in any stage, that is, at any time, when the controller receives an electrical signal from the water intake control device indicating the start of water intake, the water purifier can stop the current stage and preferentially enter the water intake stage S1.

In the standby stage S4, if the pressure detector detects that the pressure P0 of the pipeline is lower than the first predetermined pressure value P1, the booster pump 210 and the water inlet solenoid valve 230 are activated, and the booster stage S3 is entered.

It can be understood that the flowchart of the control method shown in FIG. 2 is for illustration only, and does not constitute a limitation to the present invention.

In the description of the present invention, it should be understood that orientation words such as "front", "rear", "upper", "lower", "left", "right", "horizontal", "vertical", "vertical" "," "horizontal" and "top", "bottom" and so on indicate the orientation or positional relationship is usually based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, in the absence of the opposite description Under the circumstance, these orientation words do not indicate and imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be construed as a limitation on the protection scope of the present invention; the orientation words “in”, “in” Outside" means inside and outside relative to the contours of the components themselves.

For ease of description, spatially relative terms, such as "on", "over", "on top of", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one or more components or features to other components or features. It should be understood that spatially relative terms encompass not only the orientation of components as depicted in the figures, but also different orientations in use or operation. For example, if a component in the figures is turned upside down in its entirety, reference to the component "above" or "above" other components or features would include the components "below" or "above the other components or features" under the structure". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." In addition, these components or features may also be oriented at other different angles (eg, rotated 90 degrees or at other angles), all of which are intended to be encompassed herein.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, parts, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein.

The present invention has been described by the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of illustration and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can also be made according to the teachings of the present invention, and these variations and modifications all fall within the protection claimed in the present invention. within the range. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (17)

1. A water purifier, comprising a main water pipeline connected between a water inlet and a water intake of the water purifier, and a booster pump and a reverse osmosis filter element are sequentially arranged along the water flow direction on the main water pipeline, and the The water machine also includes a concentrated water pipeline connected between the concentrated water outlet of the reverse osmosis filter element and the water outlet of the water purifier, characterized in that the water purifier also includes a pressure detector, a drain solenoid valve and a control The pressure detector is arranged on the main water pipeline between the booster pump and the reverse osmosis filter element; the drain solenoid valve is arranged on the concentrated water pipeline; the controller is electrically connected to the booster a pump, the pressure detector and the drain solenoid valve; The controller is configured to control the drain solenoid valve to open for a first period of time when receiving an electrical signal indicating that water withdrawal is stopped; When the line pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure, the booster pump is controlled to stop working. 2. The water purifier of claim 1, wherein The controller is further configured to control the booster pump to start when the line pressure detected by the pressure detector decreases to a predetermined value lower than the first pressure. 3. The water purifier according to claim 1 or 2, wherein the pressure detector is a first pressure switch. 4. The water purifier according to claim 1 or 2, wherein the main water pipeline is further provided with a first check valve, and the water inlet of the first check valve communicates with the booster pump. A water outlet, the water outlet of the first check valve communicates with the water inlet of the pressure detector. 5. The water purifier according to claim 1 or 2, wherein the water purifier further comprises: a water intake control device arranged on the main water pipeline downstream of the reverse osmosis filter element, the water intake control device being connected to the controller is electrically connected, The water intake control device is configured to generate and transmit the electrical signal indicating stop of water intake to the controller. 6. The water purifier of claim 5, wherein The water intake control device includes a second pressure switch, and the second predetermined pressure value of the second pressure switch is smaller than the first predetermined pressure value; The main water pipeline is also provided with a second check valve, the water inlet of the second check valve is connected to the pure water port of the reverse osmosis filter element, and the water outlet of the second check valve is connected to the second check valve. Water inlet for pressure switch. 7. The water purifier according to claim 6, wherein the first predetermined pressure value is greater than or equal to 0.4 MPa and less than or equal to 0.5 MPa, and the second predetermined pressure value is greater than or equal to 0.2 MPa and less than or equal to 0.3MPa. 8. The water purifier according to claim 5, wherein the water intake control device is an electronically controlled faucet, and the electronically controlled faucet is arranged at the water intake. 9. The water purifier according to claim 1 or 2, wherein the water purifier further comprises a water inlet solenoid valve, and the water inlet solenoid valve is arranged between the water inlet and the booster pump. On the main water pipeline between the two, the water inlet solenoid valve is electrically connected to the controller, and the controller is also used to control the water inlet solenoid valve to open while controlling the booster pump to start, and to control the When the booster pump stops working, the water inlet solenoid valve is controlled to be closed. 10. The water purifier according to claim 1 or 2, wherein the water purifier further comprises a concentrated water combination valve, the concentrated water combination valve is arranged on the concentrated water pipeline, and the concentrated water combination valve The valve includes a waste water ratio device and a concentrated water solenoid valve connected in parallel, the concentrated water solenoid valve is electrically connected to the controller, and the controller is further used for: when receiving the electrical signal indicating that water withdrawal is stopped, control the The concentrated water solenoid valve is opened; the concentrated water solenoid valve is controlled to be closed when an electrical signal indicating the start of water intake is received or when the pipeline pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure. 11. The water purifier according to claim 1 or 2, wherein the first time period is greater than or equal to 10 seconds and less than or equal to 30 seconds. 12. The water purifier according to claim 1 or 2, wherein the predetermined value of the first pressure is greater than or equal to 0.4 MPa and less than or equal to 0.5 MPa. 13. A control method for a water purifier, the water purifier comprising a main water pipeline connected between a water inlet and a water intake of the water purifier, and a booster pump is sequentially arranged on the main water pipeline along the water flow direction and a reverse osmosis filter element, the water purifier also includes a concentrated water pipeline connected between the concentrated water outlet of the reverse osmosis filter element and the water outlet of the water purifier, characterized in that the water purifier also includes a pressure a detector and a drain solenoid valve, the pressure detector is arranged on the main water pipeline between the booster pump and the reverse osmosis filter element; the drain solenoid valve is arranged on the concentrated water pipeline; the control method includes : Controlling the drain solenoid valve to open for a first period of time when receiving an electrical signal indicating that water withdrawal is stopped; and When the line pressure detected by the pressure detector rises to a predetermined value not lower than the first pressure, the booster pump is controlled to stop working. 14. The control method according to claim 13, wherein the control method further comprises: When the line pressure detected by the pressure detector drops below the predetermined value of the first pressure, the booster pump is controlled to start. 15. The control method according to claim 13 or 14, wherein the water purifier further comprises a water inlet solenoid valve, and the water inlet solenoid valve is arranged between the water inlet and the booster pump on the main water pipeline; the control method further includes: When the booster pump is controlled to start, the water inlet solenoid valve is controlled to open; and when the booster pump is controlled to stop working, the water inlet solenoid valve is controlled to be closed. 16. The control method according to claim 13 or 14, wherein the water purifier further comprises: a water intake control device arranged on the main water pipeline downstream of the reverse osmosis filter element, and the water intake control device is connected to the water intake control device. the controller is electrically connected, The control method also includes: The electrical signal indicating stop of water intake is received from the water intake control device. 17. The control method according to claim 16, wherein the control method further comprises: An electric signal indicating the start of water intake is received from the water intake control device, and when the electric signal indicating the start of water intake is received, the booster pump is controlled to start.

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