Water purifier

Abstract

The utility model provides a water purifier. The water purifier comprises a booster pump, a filter device, a check valve, a pressure detection device and a concentrated water electromagnetic valve, a water inlet of the booster pump is connected to the raw water inlet, the filter device comprises a water inlet, a purified water outlet and a concentrated water outlet, a water outlet of the booster pump is connected to the water inlet of the filter device, and a concentrated water opening of the filter device is connected to the drainage opening. A water inlet of the check valve is connected to a purified water outlet of the filtering device, a water outlet of the check valve is connected to the water taking opening, the pressure detection device is arranged on a pipeline between the water outlet of the check valve and the water taking opening and used for detecting the pressure of the pipeline, and the booster pump stops working when the pressure is larger than a preset threshold value. The concentrated water electromagnetic valve is connected in series between the concentrated water outlet and the water outlet of the filtering device and is opened when meeting a preset condition, and the preset condition comprises that the pressure is greater than a preset threshold value. The booster pump of the water purifier can be prevented from being repeatedly started and stopped under the condition that the modification cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water purifier. Background Art

[0002] As people's quality of life continues to improve, water purifiers have become common household appliances. Water purifiers can usually be connected to municipal tap water and provide purified water to users. Water purifiers filter out harmful bacteria, viruses, heavy metals and other substances, which are more beneficial to health.

[0003] Some water purifiers on the market use traditional mechanical faucets, which are low-cost, easy to operate, and more convenient for children and the elderly to operate. Water purifiers using mechanical faucets are equipped with a high-pressure switch and a check valve downstream of the water-making component, and the high-pressure switch is set between the check valve and the faucet. When the faucet is closed, high pressure will accumulate between the check valve and the faucet until the high-pressure switch trips and stops the water-making component from working. When the user turns on the faucet, the pressure between the check valve and the faucet is released, so the high-pressure switch closes and the water-making component starts to make water. The check valve can prevent the pressure leakage in the downstream pipeline used to trigger the high-pressure switch. The function of the check valve to maintain the water pressure in the pipeline can be called pressure maintenance.

[0004] However, in actual applications, when the faucet is closed, it is still found that the water-making component will start and stop repeatedly, which not only causes a waste of water resources and affects the service life of the water purifier, but also generates noise and a poor user experience. Utility Model Content

[0005] In order to at least partially solve the problems existing in the prior art, the utility model provides a water purifier, having a raw water inlet, a water intake and a drain, including: a booster pump, the water inlet of the booster pump is connected to the raw water inlet; a filtering device, the filtering device includes a water inlet, a clean water outlet and a concentrated water outlet, the water outlet of the booster pump is connected to the water inlet of the filtering device, and the concentrated water outlet of the filtering device is connected to the drain; a check valve, the water inlet of the check valve is connected to the clean water outlet of the filtering device, and the water outlet of the check valve is connected to the water intake; a pressure detection device, the pressure detection device is arranged on the pipeline between the water outlet and the water intake of the check valve, the pressure detection device is used to detect the pressure of the pipeline, and the booster pump stops working when the pressure is greater than a preset threshold value; and a concentrated water solenoid valve, the concentrated water solenoid valve is arranged in series between the concentrated water outlet and the drain of the filtering device, and the concentrated water solenoid valve is opened when a preset condition is met, and the preset condition includes that the pressure is greater than a preset threshold value.

[0006] In the above technical scheme, the booster pump and the concentrated water solenoid valve are controlled simultaneously by the pressure detection device. The check valve can be reliably closed by quickly establishing a sufficiently large pressure difference on both sides of the check valve at a low modification cost. This can avoid the problem of repeated starting and stopping of the booster pump due to slow leakage of the check valve in the water purifier, thereby extending the service life of the water purifier (especially its components such as the booster pump), without generating noise or wasting water resources, and providing a good user experience.

[0007] Exemplarily, the water purifier includes: a control module, which is electrically connected to the pressure detection device and is used to start counting when the pressure is greater than a preset threshold; and to control the concentrated water solenoid valve to close when the accumulated time reaches a first preset time threshold.

[0008] To ensure that the concentrated water is drained, the first preset time threshold may be set to 3-5 seconds, after which the concentrated water solenoid valve is closed and will not continue to consume power or generate heat, thereby improving user experience.

[0009] Exemplarily, the control module is electrically connected to the concentrated water solenoid valve, and is configured to start accumulating time when the concentrated water solenoid valve is turned on; and control the concentrated water solenoid valve to be closed when the accumulated time reaches a first preset time threshold.

[0010] To ensure that the concentrated water is drained, the first preset time threshold may be set to 3-5 seconds, after which the concentrated water solenoid valve is closed and will not continue to consume power or generate heat, thereby improving user experience.

[0011] Exemplarily, the water purifier includes: a control module for accumulating the usage time of the water purifier and controlling the concentrated water solenoid valve to open when a preset condition is met, wherein the preset condition also includes that the accumulated usage time reaches a second preset time threshold.

[0012] When the cumulative use time of the water purifier reaches the second preset time threshold, the failure risk of the check valve reaches a high level. The failure problem of the check valve can be prevented or alleviated by opening the concentrated water solenoid valve when the water intake is stopped, so as to avoid repeated start and stop of the water purifier. Of course, technicians in this field can set the function of opening the concentrated water solenoid valve immediately after the water purifier is stopped for the first use as needed, so that the reliability is higher.

[0013] Exemplarily, the concentrated water solenoid valve includes a normally-open wastewater ratio water passage hole, and the wastewater ratio water passage hole is used to limit the wastewater ratio of the filtering device.

[0014] The wastewater ratio valve and the concentrated water solenoid valve can also be integrated together. Such integrated wastewater ratio valve and concentrated water solenoid valve have a more compact structure and higher reliability.

[0015] Exemplarily, the water purifier further includes a waste water ratio valve connected in parallel with the concentrated water solenoid valve.

[0016] The wastewater ratio of the concentrate solenoid valve and the solenoid valve can be separated from each other. The wastewater ratio valve allows the concentrate to pass through at an appropriate flow rate, so that the pressure difference in the filter device can be maintained to ensure normal water production, and the impurities in the raw water can be discharged through the wastewater ratio valve in time to extend the service life of the filter device.

[0017] Exemplarily, the check valve is a pressure check valve.

[0018] The pressure check valve does not need to rely on other factors and can be placed in any posture. It does not require the pressure check valve and the water purifier installed with the pressure check valve to maintain a suitable posture like the gravity check valve. When there is a pressure difference between the upstream and downstream of the pressure check valve, the function of automatically preventing the backflow of purified water can be realized. It has a simple structure and low cost.

[0019] Exemplarily, the pressure check valve includes: a valve body, the water inlet and the water outlet of the check valve are both arranged on the valve body, and the valve body also includes a fluid channel connected between the water inlet and the water outlet of the check valve; a water stop member, the water stop member is arranged in the fluid channel and has a first position that makes the fluid channel conductive and a second position that blocks the fluid channel, the second position is farther away from the water inlet of the check valve than the first position; and an elastic member, the elastic member is used to apply an elastic force toward the second position to the water stop member.

[0020] The use of a water retaining member with an elastic member can extend the service life of the check valve. Under the same use environment, the time of failure will be much later than that of a check valve without an elastic member. Of course, a check valve with more reliable pressure maintenance can also be selected, but its cost may be higher. The use of the check valve in the above embodiment can achieve a balance between cost and pressure maintenance effect, and combined with the method of releasing pressure from the concentrated water solenoid valve at the beginning of this application, it may ensure the reliable operation of the water purifier.

[0021] Exemplarily, the concentrated water solenoid valve is a normally closed solenoid valve.

[0022] The normally closed solenoid valve opens when energized, allowing a larger water flow to pass through.

[0023] Exemplarily, the pressure detection device is a high-pressure switch, which trips when the pressure is greater than a preset threshold.

[0024] The high-voltage switch is low-cost and has simple control logic. It can be used in conjunction with the mechanical faucet described below to control the start and stop of the water purifier.

[0025] Exemplarily, the water purifier further comprises a mechanical faucet connected to the water inlet.

[0026] Water purifiers that use mechanical faucets are lower in cost and are compatible with sinks, dishwashing basins, washbasins, etc. on the market. They are easy to operate, friendly to the elderly and children, and conform to the usage habits of most users.

[0027] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the detailed implementation section. The utility model content section does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0028] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention. In the drawings,

[0030] Figure 1 A water circuit diagram of a water purifier according to an exemplary embodiment of the present application is shown;

[0031] Figure 2 A structural diagram of a check valve of a water purifier according to an exemplary embodiment of the present application is shown.

[0032] The above drawings include the following reference numerals:

[0033] 100. Water purifier; 101. Raw water inlet; 102. Water intake; 103. Drainage outlet; 104. First pipeline; 105. Second pipeline; 106. Third pipeline; 110. Booster pump; 120. Filter device; 130. Check valve; 131. Valve body; 1311. Fluid channel; 1312. First valve housing; 1313. Second valve housing; 132. Water retaining member; 133. Elastic member; 134. Sealing member; 140. Mechanical faucet; 150. Concentrated water solenoid valve; 160. Pressure detection device. DETAILED DESCRIPTION

[0034] In the following description, a large number of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only illustrates preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail.

[0035] Depending on the type, the water purifier may include or exclude a booster pump in its water making component. For a water purifier whose water making component does not include a booster pump, it relies on the water pressure (about 0.24MPa) of the municipal water to achieve filtration. The start and stop of the water making component does not need to be controlled, and it only relies on the pressure difference to work, so there is no need to set a pressure detection device and a check valve, and there will be no problem of repeated start and stop mentioned above. For a water purifier whose water making component includes a booster pump, the booster pump can increase the water pressure at the water inlet of the filter device to meet its rated working pressure. The pressure detection device and the check valve of the water purifier are mainly used to cooperate with the mechanical faucet to control the start and stop of the booster pump, so as to control whether the water purifier makes water. However, the inventor found that after the faucet is closed and the booster pump stops working, the check valve may not be reliably closed. Specifically, when the faucet is closed, the water in the downstream pipeline of the check valve used to trigger the pressure detection device will slowly leak through the check valve, causing the pressure maintenance function of the check valve to fail; the pressure in the pipeline will gradually decrease until the pressure detection device is activated, and the water purifier starts to make water again. The inability of the check valve to reliably maintain pressure in the pipeline is the fundamental reason why water purifiers with mechanical faucets repeatedly start and stop.

[0036] In order to at least partially solve the above problems, the present application provides a water purifier. Figure 1 As shown, the water purifier 100 has a raw water inlet 101, a water intake 102 and a drain 103, and also includes a booster pump 110 and a filter device 120. The water inlet of the booster pump 110 is connected to the raw water inlet 101, and the raw water can be pressurized. The filter device 120 includes a water inlet, a clean water outlet and a concentrated water outlet. The water outlet of the booster pump 110 is connected to the water inlet of the filter device 120, and the concentrated water outlet of the filter device 120 is connected to the drain 103 through a third pipeline 106. Thus, the pressurized raw water can be filtered by the filter device 120 to generate clean water and concentrated water, and the concentrated water can be discharged to the outside of the water purifier 100 through the drain 103. As described above, the water purifier 100 further includes a check valve 130 and a pressure detection device 160. The water inlet of the check valve 130 can be connected to the purified water outlet of the filter device 120 through the first pipeline 104, and the water outlet of the check valve 130 is connected to the water intake 102 through the second pipeline 105. The pressure detection device 160 is disposed on the second pipeline 105 between the water outlet of the check valve 130 and the water intake 102. The pressure detection device 160 is used to detect the pressure of the second pipeline 105. The booster pump 110 stops working when the pressure is greater than a preset threshold.

[0037] The filter device 120 adapted to the booster pump 110 may include a nanofiltration filter element, a reverse osmosis filter element, or a filter element composed of the two. These filter elements will produce a certain proportion of concentrated water when working, and the concentrated water can be discharged from the drain port 103. The booster pump 110 and the filter device 120 together can be referred to as a water production component. Figure 1, during the water production process of the water purifier 100, the booster pump 110 works, which will generate a large pressure in the first pipeline 104 of the rear section of the water production component. The pressure can act on the water retaining member in the check valve 130, and the generated pressure can cause the water retaining member to move to make the check valve 130 conductive. The purified water is provided to the user through the second pipeline 105, and the pressure in the second pipeline 105 is relatively small. When the user stops taking water, it may be by closing the faucet, etc. At this time, the pressure gradually accumulates in the second pipeline 105. When the pressure detected by the pressure detection device 160 is greater than the preset threshold, the booster pump 110 of the water purifier 100 stops working, and the water production component stops making water. Under normal circumstances, the water in the second pipeline 105 will not flow back under the action of the check valve 130, and the pressure in the second pipeline 105 will no longer decrease until the user takes water again, and the pressure in the second pipeline 105 is reduced by opening the faucet, etc., and the pressure of the pressure detection device 160 is less than the preset threshold, and the booster pump 110 works again.

[0038] The water purifier 100 also includes a concentrated water solenoid valve 150, which can be arranged on the third pipeline 106, that is, it is arranged in series between the concentrated water outlet and the drain outlet 103 of the filter device 120. During the water production process of the water purifier 100, the concentrated water solenoid valve 150 remains closed. Exemplarily, the water purifier 100 can also include a wastewater ratio valve connected in parallel with the concentrated water solenoid valve 150. The wastewater ratio valve can allow concentrated water to pass through at an appropriate flow rate, so that the pressure difference in the filter device 120 can be maintained to ensure normal water production, and the impurities in the raw water can be discharged in time through the wastewater ratio valve to extend the service life of the filter device 120. The wastewater ratio and the solenoid valve of the concentrated water solenoid valve 150 can be separate from each other. Optionally, the wastewater ratio valve and the concentrated water solenoid valve 150 can also be integrated together, and the integrated wastewater ratio valve and concentrated water solenoid valve 150 are more compact and more reliable. Exemplarily, the concentrated water solenoid valve 150 may include a normally open wastewater ratio water hole, which is used to limit the wastewater ratio of the filter device 120. In this way, when making water, the concentrated water solenoid valve 150 can be closed, and the concentrated water is discharged at an appropriate flow rate through the wastewater ratio water hole. When the filter device 120 needs to be rinsed, the concentrated water solenoid valve 150 can be opened, and the raw water can pass through the filter device 120 at a large flow rate and be discharged from the water purifier 100 from the opened concentrated water solenoid valve 150. At this time, the large flow of raw water can remove impurities deposited in the filter device 120, thereby extending the service life of the filter device 120. The inventor also understands and recognizes that when the boost pump 110 stops working, the pressure in the first pipeline 104 downstream of the filter device 120 gradually leaks through the concentrated water solenoid valve 150, but when the concentrated water solenoid valve 150 is in a closed state, the pressure release is relatively slow.

[0039] The inventor has analyzed the failure cause of the check valve 130. Taking a typical check valve 130 as an example, refer to Figure 1 and Figure 2 The check valve 130 may include a fluid channel 1311 and a water retaining member 132 movable in the fluid channel 1311. The fluid channel 1311 may be blocked by the water retaining member 132 being tightly fitted with any one or more parts of the fluid channel 1311, and the check valve 130 may be in a pressure-maintaining state. A sealing member 134 is usually provided at the position where the two are tightly fitted. The water retaining member 132 may usually compress the sealing member 134 in a natural state to maintain the position of blocking the fluid channel 1311. When the pressure of the first pipeline 104 (i.e., the water inlet side of the water retaining member 132) is greater than the pressure of the second pipeline 105 (i.e., the water outlet side of the water retaining member 132), so that the water retaining member 132 can leave the natural state, the water in the first pipeline 104 may flow through the check valve 130 and enter the second pipeline 105. On the contrary, when the pressure difference between the first pipeline 104 and the second pipeline 105 is not enough to cause the water retaining member 132 to leave the natural state, the check valve 130 is in the closed state. Within the maximum pressure range of the check valve 130, the greater the pressure on the water outlet side of the water retaining member 132 is than the pressure on the water inlet side, the more the water retaining member 132 can press the sealing member 134, and the more reliable the sealing performance is. The inventors realize that by increasing the pressure difference on both sides of the check valve 130, the failure of the check valve 130 can be effectively avoided, thereby solving the problem of repeated start and stop of the water purifier 100.

[0040] The inventors further understand and realize that during the production process, the check valve 130 has a probability of having some defects, which are usually difficult to find in the inspection at the time of leaving the factory. Even if there is no defect in the check valve 130, defects may occur during long-term use due to certain wear of the water retaining member 132 and / or the sealing member 134. These problems will cause the pressure difference on both sides of the water retaining member 132 to be small, which is insufficient to press the sealing member 134 to ensure the sealing performance. Therefore, when the faucet is just closed, the pressure on both sides of the check valve 130 is relatively close, and the water in the second pipeline 105 that originally needs to maintain pressure may slowly leak into the first pipeline 104 through the check valve 130, causing the water pressure in the second pipeline 105 to gradually decrease. Although as mentioned above, the pressure in the first pipeline 104 will slowly leak through the wastewater ratio water hole or the wastewater ratio valve, the speed of establishing a sufficient pressure difference on both sides of the water retaining member 132 through this slow leakage is slow. Because the pressure difference is established while the water in the second pipeline 105 leaks into the first pipeline 104, the pressure in the second pipeline 105 has dropped below the preset threshold before a sufficient pressure difference is established, which makes it difficult for the water retaining member 132 to reliably maintain a closed state, and the pressure of the water circuit that needs to maintain pressure continues to decrease, resulting in the problem of repeated start and stop of the booster pump 110. Therefore, the discharge speed of the water in the first pipeline 104 upstream of the check valve 130 can be accelerated to establish a sufficient pressure difference between the first pipeline 104 and the second pipeline 105 as soon as possible, so that the check valve 130 is reliably in a closed state, and the pressure leakage in the second pipeline 105 downstream thereof is prevented.

[0041] After comprehensively analyzing the application scenarios of the check valve 130 and the failure reasons of the check valve 130, the water purifier 100 of the present application can open the concentrated water solenoid valve 150 when the preset conditions are met, and the preset conditions include that the pressure detected by the pressure detection device 160 is greater than the preset threshold. In other words, when the pressure detected by the pressure detection device 160 is less than the preset threshold (i.e., the faucet is turned on), the booster pump 110 of the water purifier 100 works and the concentrated water solenoid valve 150 is closed; when the pressure detection device 160 detects that the pressure is greater than the preset threshold (i.e., the faucet is closed), the booster pump 110 of the water purifier 100 stops working and the concentrated water solenoid valve 150 is opened.

[0042] After the concentrated water solenoid valve 150 is opened, the concentrated water can be quickly discharged from the drain port 103, so that the pressure in the third pipeline 106 is quickly reduced. The pressure difference between the clean water port and the concentrated water port of the filter device 120 increases rapidly, so that the clean water in the first pipeline 104 permeates at a faster speed and is discharged from the drain port 103, thereby causing the pressure in the first pipeline 104 to drop rapidly, and the pressure difference between the pressure in the second pipeline 105 and the pressure in the first pipeline 104 increases rapidly, so that the pressure acting on the check valve 130 increases rapidly, so that the sealing effect of the check valve 130 is enhanced, and the pressure leakage in the downstream second pipeline 105 is prevented. In this way, the pressure-maintaining effect of the check valve 130 is enhanced, and the problem of repeated start and stop of the water purifier 100 is solved.

[0043] In the above technical scheme, the boost pump 110 and the concentrated water solenoid valve 150 are simultaneously controlled by the pressure detection device 160. By quickly establishing a sufficiently large pressure difference on both sides of the check valve 130 with low modification cost, the check valve 130 can be reliably closed. This can avoid the problem of repeated start and stop of the boost pump 110 due to slow water leakage of the check valve 130 in the water purifier 100, thereby extending the service life of the water purifier 100 (especially the boost pump 110 and other components therein), without generating noise or wasting water resources, and providing a good user experience.

[0044] Exemplarily, the water purifier 100 may include a control module, which may be electrically connected to the pressure detection device 160 to start timing when the pressure is greater than a preset threshold, and control the concentrated water solenoid valve 150 to close when the accumulated time reaches a first preset time threshold. The control module may be constructed using electronic components such as a timer, a comparator, a register, and a digital logic circuit, or may be implemented using a processor chip such as a single chip microcomputer, a microprocessor, a programmable logic controller (PLC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic array (PLA), an application specific integrated circuit (ASIC), and its peripheral circuits.

[0045] The concentrated water solenoid valve 150 can be a normally closed solenoid valve, which opens when powered on to allow a larger water flow to pass through. The control module can determine that the user stops taking water based on the pressure being greater than the preset threshold. At this time, the concentrated water solenoid valve 150 can be controlled to open, and the pressure of the concentrated water can be quickly released, thereby causing the pressure difference on both sides of the check valve 130 to increase rapidly, and the check valve 130 can be reliably closed to prevent the water purifier 100 from repeatedly starting and stopping. The concentrated water solenoid valve 150 will continue to consume electrical energy when it is open, and the coil will heat up. In order to extend the service life of the concentrated water solenoid valve 150 and the circuit that controls its opening, and reduce energy consumption at the same time, the controller can start timing when the user stops taking water, and control the concentrated water solenoid valve 150 to close when the accumulated time reaches the first preset time threshold. The first preset time threshold can be reasonably set according to actual needs, for example, according to the filter device 120 of the water purifier 100. Taking the water purifier 100 with a flux of 400G (400 gallons of water per day) as an example, the flow rate when the concentrated water solenoid valve 150 is closed is generally 400ml / min. There may be 200-400ml of concentrated water in the filter device 120 (depending on the filter element, the difference is large). At this time, it takes 30-60s to stop the flow. When the concentrated water solenoid valve 150 is opened, the flow rate can reach 3L / min. To ensure that the concentrated water is drained, the concentrated water solenoid valve 150 can be opened for 3-5 seconds. In other words, the above-mentioned first preset time threshold can be set to 3-5 seconds. After that, the concentrated water solenoid valve 150 is closed and will not continue to consume electricity or generate heat, thereby improving the user experience.

[0046] Exemplarily, the control module is electrically connected to the concentrated water solenoid valve 150, and is used to start accumulating time when the concentrated water solenoid valve 150 is opened, and control the concentrated water solenoid valve 150 to close when the accumulated time reaches a first preset time threshold. Compared with the detection pressure being greater than the preset threshold, by timing when the concentrated water solenoid valve 150 starts to work, the working time of the concentrated water solenoid valve 150 can be more directly controlled, thereby ensuring that all the concentrated water is discharged, and preventing the concentrated water solenoid valve 150 from working for too long, resulting in heat and energy waste.

[0047] Normally, the check valve 130 in a newer water purifier 100 may not have serious leakage, but after a period of use, due to aging and wear of the check valve 130, the water retaining member 132 is not sealed tightly, and then obvious failure occurs, causing the booster pump 110 to start and stop repeatedly. Before the check valve 130 shows the above obvious failure, there is no need to use the above action of opening the concentrated water solenoid valve 150.

[0048] On the one hand, when the water purifier 100 produces water, the booster pump 110 needs to first accumulate pressure in the filter device 120 and the pipeline, and it takes a certain amount of time for the water pressure provided by the booster pump 110 to increase. When the user takes water, the purified water may not be obtained immediately, and the user experience is poor. Therefore, the concentrated water solenoid valve 150 can adopt a normally closed solenoid valve. When the concentrated water solenoid valve 150 is not opened, the pressure in the filter device 120 and the pipeline may be maintained to reduce the waiting time for the next user to take water. On the other hand, opening the concentrated water solenoid valve 150 to quickly discharge the concentrated water causes the pressure difference between the purified water in the first pipeline 104 and the concentrated water in the third pipeline 106 to increase rapidly, which may cause an impact on the filter device 120, resulting in a reduction in the service life of the filter device 120, or noise during drainage. Therefore, before the check valve 130 fails, opening the concentrated water solenoid valve 150 after the user stops taking water may have certain side effects.

[0049] Exemplarily, the control module can also be used to accumulate the usage time of the water purifier 100, and control the concentrated water solenoid valve 150 to open when the preset conditions are met, wherein the preset conditions can also include that the accumulated usage time reaches a second preset time threshold. As described above, the use of the concentrated water solenoid valve 150 on the new water purifier 100 to prevent the failure of the check valve 130 may not be of great significance, and may bring certain side effects. In order to ensure user experience, the failure time of the check valve 130 can be counted, and the second preset time threshold is set based on the failure time. When the cumulative usage time of the water purifier 100 reaches the second preset time threshold, the failure risk of the check valve 130 reaches a high level, and the concentrated water solenoid valve 150 can be opened when the water is stopped to prevent or alleviate the failure problem of the check valve 130, so as to avoid repeated start and stop of the water purifier 100. Of course, those skilled in the art can set the function of opening the concentrated water solenoid valve 150 immediately after the water purifier 100 is just started to be used as needed, so that the reliability is higher.

[0050] Exemplarily, the check valve 130 may be a pressure check valve. Specifically, for example, the water retaining member of the pressure check valve may include a small ball movable in a fluid channel, and the movement of the small ball is completely driven by the fluid flowing through the pressure check valve. In this case, the pressure check valve does not need to rely on other factors and can be placed in any posture. It does not require the pressure check valve and the water purifier 100 installed with the pressure check valve to maintain a suitable posture like a gravity check valve. In the case of a pressure difference between the upstream and downstream of the pressure check valve, the function of automatically preventing the backflow of purified water can be achieved, with a simple structure and low cost.

[0051] For example, Figure 2As shown, the pressure check valve may include: a valve body 131, a water stopper 132 and an elastic member 133. The water inlet (on the left side in the illustrated embodiment) and the water outlet (on the right side in the illustrated embodiment) of the check valve 130 are both arranged on the valve body 131, and the valve body 131 also includes a fluid channel 1311 connected between the water inlet and the water outlet of the check valve 130. The water stopper 132 is arranged in the fluid channel 1311 and has a first station for conducting the fluid channel 1311 and a second station for cutting off the fluid channel 1311, and the second station is farther away from the water inlet of the check valve 130 than the first station. The elastic member 133 is used to apply an elastic force toward the second station to the water stopper 132.

[0052] As mentioned above, some water purifiers use a check valve whose water retaining member can move only by water pressure. In the case of a small pressure difference between the upstream and downstream of the check valve 130, the sealing effect will be significantly reduced. Therefore, it can be used Figure 2The pressure check valve 130 shown includes an elastic member 133. The direction indicated by the arrow in the figure is the direction of water flow. The valve body 131 can be integrally formed, or it can be assembled from multiple discrete parts as shown in the figure to reduce the difficulty and cost of processing. The elastic member 133 can include a spring, a spring sheet, etc., to apply a certain elastic force to the water retaining member 132. A sealing member 134 such as a sealing ring or a sealing pad can be provided on the water retaining member 132 and / or the valve body 131. When the water retaining member 132 reaches the second station, the water retaining member 132 can be tightly pressed against the sealing member 134 to achieve sealing. For the convenience of processing, the valve body 131 can include a first valve housing 1312 and a second valve housing 1313. The elastic member 133, the water retaining member 132 and the sealing member 134 can be assembled into the second valve housing 1313 before the second valve housing 1313 is installed in the first valve housing 1312, and formed into an integral part. Then the integral part is assembled into the first valve housing 1312. In this case, the fluid channel 1311 is formed by the first valve housing 1312 and the second valve housing 1313. The pressure difference between the upstream and downstream of the check valve 130 acts on the water retaining member 132. Under the combined force of the pressure generated by the pressure difference and the elastic force generated by the elastic member 133, the water retaining member 132 moves in the fluid channel 1311, so that the check valve 130 is opened and closed. The elastic force direction of the elastic member 133 is opposite to the water flow direction. When the upstream pressure of the check valve 130 is greater than the downstream pressure, the combined force of the pressure can counteract the elastic force of the elastic member 133, so that the elastic member 133 is compressed until it reaches the first opening position of the check valve 130, and the clean water passes through the check valve 130 and reaches the second pipeline 105 downstream thereof. Thus, the check valve 130 can make the clean water flow in one direction. When the pressures at both ends of the water retaining member 132 are close, the resultant pressure force acting on the water retaining member 132 is close to 0, and the water retaining member 132 is maintained in the second position where the check valve 130 is closed only by the elastic force of the elastic member 133. The use of a water retaining member 132 with an elastic member 133 can extend the service life of the check valve 130. Under the same use environment, the time of failure will be much later than that of the check valve 130 without the elastic member 133. Of course, a check valve with more reliable pressure maintenance can also be selected, but its cost may be higher. The use of the check valve 130 in the above embodiment can achieve a balance between cost and pressure maintenance effect, and combined with the method of releasing pressure from the concentrated water solenoid valve 150 at the beginning of this application, it is possible to ensure the reliable operation of the water purifier 100.

[0053] Exemplarily, the pressure detection device 160 may be a high-pressure switch, which trips when the pressure is greater than a preset threshold. Exemplarily and not restrictively, the high-pressure switch may be a single-pole single-throw switch having two pins, which are connected or disconnected in different states. In this case, a normally closed high-pressure switch may be used, the booster pump 110 is connected to the power supply in series with the high-pressure switch, and the concentrated water solenoid valve 150 is a normally open solenoid valve, which is connected in parallel with the booster pump 110. When the pressure acting on the high-pressure switch is small, the circuit is connected, the booster pump 110 works, the water purifier 100 produces water, and the concentrated water solenoid valve 150 is closed to maintain the pressure of the raw water. After the high-pressure switch trips, the circuit is disconnected, the booster pump 110 stops working, and the concentrated water solenoid valve 150 is opened to release the pressure of the raw water and the concentrated water, thereby ensuring the reliable closure of the check valve 130. In another embodiment, the high-pressure switch may be a single-pole double-throw switch, including three pins, and before and after the high-pressure switch trips, one of the three pins is connected to one of the other two pins. The power supply is connected to the booster pump 110 and the concentrated water solenoid valve 150 through the high-voltage switch. The concentrated water solenoid valve 150 can be a normally closed solenoid valve. Before the high-voltage switch is tripped, the booster pump 110 is connected to the power supply, the concentrated water solenoid valve 150 is not powered, and the water purifier 100 produces water. After the high-voltage switch is tripped, the concentrated water solenoid valve 150 is connected to the power supply, the booster pump 110 is powered off, and the pressure of the raw water and concentrated water is released to ensure the reliable closure of the check valve 130. The high-voltage switch is low in cost and simple in control logic. It can cooperate with the mechanical faucet 140 described below to control the start and stop of the water purifier 100.

[0054] For example, the water purifier 100 may further include a mechanical faucet 140, which is connected to the water inlet 102. The user can change the pressure in the second pipeline 105 by opening and closing the mechanical faucet 140, so that the pressure detected by the pressure detection device 160 changes, thereby controlling the start and stop of the water purifier 100 and the opening of the concentrated water solenoid valve 150. The water purifier 100 using the mechanical faucet 140 has a low cost, is compatible with sinks, dishwashing pools, wash basins, etc. on the market, and is simple to operate, friendly to the elderly and children, and conforms to the usage habits of most users.

[0055] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, regional relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0059] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A water purifier having a raw water inlet, a water intake and a drain outlet, characterized in that: include: A booster pump, wherein the water inlet of the booster pump is connected to the raw water inlet; A filter device, the filter device comprising a water inlet, a clean water outlet and a concentrated water outlet, the water outlet of the booster pump is connected to the water inlet of the filter device, and the concentrated water outlet of the filter device is connected to the drain outlet; a check valve, wherein the water inlet of the check valve is connected to the clean water outlet of the filtering device, and the water outlet of the check valve is connected to the water intake; A pressure detection device, the pressure detection device is arranged on the pipeline between the water outlet of the check valve and the water intake, the pressure detection device is used to detect the pressure of the pipeline, and the booster pump stops working when the pressure is greater than a preset threshold; and A concentrated water solenoid valve is provided in series between the concentrated water outlet and the drain outlet of the filter device, and the concentrated water solenoid valve is opened when a preset condition is met, wherein the preset condition includes that the pressure is greater than the preset threshold.

2. The water purifier according to claim 1, characterized in that: The water purifier comprises: A control module, wherein the control module is electrically connected to the pressure detection device, and is used to start timing when the pressure is greater than the preset threshold value, and / or the control module is electrically connected to the concentrated water solenoid valve, and is used to start accumulating time when the concentrated water solenoid valve is opened; and control the concentrated water solenoid valve to close when the accumulated time reaches a first preset time threshold.

3. The water purifier according to claim 1, characterized in that: The water purifier comprises: The control module is used to accumulate the usage time of the water purifier and control the concentrated water solenoid valve to open when the preset condition is met, wherein the preset condition also includes that the accumulated usage time reaches a second preset time threshold.

4. The water purifier according to any one of claims 1 to 3, characterized in that: The concentrated water solenoid valve comprises a normally-open wastewater ratio water passage hole, and the wastewater ratio water passage hole is used to limit the wastewater ratio of the filtering device.

5. The water purifier according to any one of claims 1 to 3, characterized in that: The water purifier also includes a waste water ratio valve connected in parallel with the concentrated water solenoid valve.

6. The water purifier according to any one of claims 1 to 3, characterized in that: The check valve is a pressure check valve.

7. The water purifier according to claim 6, characterized in that: The pressure check valve comprises: A valve body, on which the water inlet and the water outlet of the check valve are both arranged, and the valve body further comprises a fluid channel connected between the water inlet and the water outlet of the check valve; a water retaining member, the water retaining member being arranged in the fluid channel and having a first position for conducting the fluid channel and a second position for blocking the fluid channel, the second position being farther from the water inlet of the check valve than the first position; and An elastic member is used to apply an elastic force to the water retaining member toward the second station.

8. The water purifier according to any one of claims 1 to 3, characterized in that: The concentrated water solenoid valve is a normally closed solenoid valve.

9. The water purifier according to any one of claims 1 to 3, characterized in that: The pressure detection device is a high-pressure switch, and the high-pressure switch trips when the pressure is greater than the preset threshold.

10. The water purifier according to any one of claims 1 to 3, characterized in that: The water purifier further comprises a mechanical faucet connected to the water inlet.

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