Water Purifier

Abstract

The present application provides a water purifier having a raw water inlet and a water outlet, including a filter device, a water inlet control device, a zero-pressure valve, a pressure detection device, a flow control pump and a heater. The raw water inlet of the filter device is connected to the raw water inlet through a first pipeline. The inlet of the zero-pressure valve is connected to the purified water outlet of the filter device through a second pipeline, the outlet of the zero-pressure valve is connected to the inlet of the flow control pump through a third pipeline, and the outlet of the flow control pump is connected to the inlet of the heater. The outlet of the heater is connected to the water outlet. The pressure detection device is connected to the third pipeline. The water inlet control device is arranged on the first pipeline or the second pipeline, and the water inlet control device blocks the water flow when the water pressure detected by the pressure detection device is greater than a preset water pressure threshold, and the preset water pressure threshold is greater than or equal to the rated water outlet pressure of the zero-pressure valve. The third pipeline and the water path elements on the third pipeline can be protected, and machine failures can also be reminded to a certain extent.

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. Purified water filters out harmful bacteria, viruses, heavy metals and other substances, making it more beneficial to health.

[0003] Many common water purifiers on the market are already equipped with an instant heating function, so that users can quickly obtain purified water of a preset temperature directly through the water purifier without the need for heating through additional electrical appliances such as electric kettles, which greatly simplifies the operation and provides a good user experience. The water purifier can control the water flow through the flow control pump, so that the temperature of the output hot water is stable to meet the needs of users. On this basis, the water purifier can also be provided with a zero-pressure valve, which can be set upstream of the flow control pump to provide the flow control pump with clean water without pressure to avoid water pressure fluctuations interfering with the flow of the flow control pump.

[0004] After a water purifier is used for a long time, the zero-pressure valve may age, causing the pressure in the downstream pipeline to rise. The aging of the zero-pressure valve will cause the water inlet pressure of the flow control pump to be unstable or unable to maintain the design pressure, thus causing the pumping flow of the flow control pump to be inaccurate, and thus unable to accurately control the water temperature of the hot water. 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, which has a raw water inlet and a water outlet. The water purifier includes a filter device, a water inlet control device, a zero pressure valve, a pressure detection device, a flow control pump and a heater, wherein the filter device includes a raw water inlet and a clean water outlet, and the raw water inlet of the filter device is connected to the raw water inlet through a first pipeline. The inlet of the zero pressure valve is connected to the clean water outlet of the filter device through a second pipeline, and the outlet of the zero pressure valve is connected to the inlet of the flow control pump through a third pipeline, and the outlet of the flow control pump is connected to the inlet of the heater. The outlet of the heater is connected to the water outlet, which is used to heat the water flowing through the heater. The pressure detection device is connected to the third pipeline. The water inlet control device is arranged on the first pipeline or the second pipeline, and the water inlet control device blocks the water flow when the water pressure detected by the pressure detection device is greater than the preset water pressure threshold, and the preset water pressure threshold is greater than or equal to the rated water outlet pressure of the zero pressure valve.

[0006] The present application detects the water pressure in the third pipeline by means of a pressure detection device disposed downstream of the zero-pressure valve. When the water pressure is greater than a preset water pressure threshold, the water inlet control device blocks the water flow, thereby preventing the water pressure in the third pipeline from continuing to increase, protecting the third pipeline and the water path components on the third pipeline, and extending the service life. In addition, when the water inlet control device blocks the water flow, the water purifier cannot normally discharge hot water because the water inlet control device blocks the water flow. Therefore, it can remind the machine failure to a certain extent. If the problem is with the zero-pressure valve, the zero-pressure valve can be repaired or replaced. In this way, it can be avoided that the aging and failed zero-pressure valve causes the flow control pump to be unable to accurately pump water to the heater, thereby causing the hot water heated by the heater to have an inaccurate temperature, and the user cannot obtain hot water of the required temperature from the water outlet.

[0007] Exemplarily, the water inlet control device further includes a booster pump. The booster pump is arranged on the first pipeline. When the filtering device is a reverse osmosis filter element, the municipal water pressure cannot meet the working water pressure of the reverse osmosis filter element. Therefore, the water needs to be pressurized before entering the reverse osmosis filter element. In this case, a booster pump can be arranged on the first pipeline to provide the required water pressure for the reverse osmosis filter element.

[0008] Exemplarily, the water inlet control device further includes a water inlet solenoid valve, which is arranged on the first pipeline. The reverse osmosis filter element will produce a certain proportion of concentrated water during the filtration process, and the concentrated water produced can be discharged through the concentrated water outlet and the concentrated water solenoid valve in sequence. Therefore, a water inlet solenoid valve can be arranged on the first pipeline to avoid the waste of resources caused by the raw water flowing out of the concentrated water outlet when the water purifier is not working.

[0009] Exemplarily, the water purifier further includes a reflux pipeline, the inlet of the reflux pipeline is connected to the purified water outlet, the outlet of the reflux pipeline is connected to the inlet of the booster pump, and a check valve is arranged on the reflux pipeline. Thus, when the water flow at the purified water outlet of the filter device is greater than the water output pumped by the flow control pump, the excess purified water is returned to the upstream of the booster pump to participate in water production again. By releasing the excess purified water, the pipeline and the water channel components thereon can be protected and their service life can be extended.

[0010] Exemplarily, the water purifier also includes a controller, which is electrically connected to the pressure detection device and the water inlet control device. The controller is used to control the water inlet control device to close when the water pressure is greater than a preset water pressure threshold. The control logic can be additionally set through the controller. In addition, the controller can also be used to eliminate circuit faults, promptly detect abnormal conditions during the operation of the water purifier, and improve the reliability and safety of the equipment. Specifically, the controller can control the panel of the water purifier to display fault information after determining that the zero-pressure valve has failed based on the water pressure information detected by the pressure detection device. It is convenient for users and maintenance personnel to eliminate and solve the faults of the water purifier.

[0011] Exemplarily, the pressure detection device is a low pressure switch, which is configured to disconnect when the water pressure is higher than a preset water pressure threshold, and the water inlet control device is powered off when the low pressure switch is disconnected. Pressure switches are usually low in cost and relatively simple to install and maintain.

[0012] For example, the third pipeline itself has a first bearing pressure, the joint of the third pipeline has a second bearing pressure, and the preset water pressure threshold is not greater than any one of the first bearing pressure and the second bearing pressure. Thus, when the third pipeline itself and the joint of the third pipeline have not reached the maximum bearing pressure, the water flow is blocked by the water inlet control device to prevent the third pipeline from rupturing and leaking, and / or the joint of the third pipeline from falling off.

[0013] For example, the joint of the third pipeline is fixed by a cable tie, so that the second bearing pressure can be greater than the first bearing pressure, so that the pressure that the third pipeline can withstand can be further increased, and the joint of the third pipeline is prevented from falling off when the pressure in the third pipeline is very low.

[0014] Exemplarily, the water purifier also includes a flow meter and a controller. The flow meter is connected to the third pipeline for detecting the water flow in the third pipeline. The controller is electrically connected to the flow meter and the flow control pump. Among them, the controller is used to control the water inlet control device to block the water flow when the water flow is greater than the current flow of the flow control pump. When the silicone tube is used for a long time, it may age, so that the silicone tube or the joint of the silicone tube can withstand a pressure lower than the rated water outlet pressure of the zero-pressure valve. At this time, even if the zero-pressure valve does not fail, the silicone tube may still leak or seep water. At this time, by comparing the water flow detected by the flow meter and the current flow of the flow control pump, it can be determined whether there is a leak in the third pipeline, which further prevents the impact caused by the leakage of the third pipeline.

[0015] Exemplarily, the flow control pump is configured to prevent water from flowing through when it stops working. In this way, the water flow can be stopped to prevent water leakage when the water outlet of the water purifier is connected to the smart faucet.

[0016] Exemplarily, the water purifier further includes a normal temperature water pipeline, which is connected between the purified water outlet and the water outlet of the filter device, and a water outlet solenoid valve is provided on the normal temperature water pipeline. The normal temperature water pipeline directly uses the pressure in the filter device to transport the normal temperature water to the water outlet, which makes the water path simpler and more efficient, and saves energy. The water outlet solenoid valve can be closed when the booster pump stops working. This prevents the user from continuing to leak water from the water outlet due to the pressure in the filter device after taking the normal temperature water.

[0017] Exemplarily, the water purifier also includes a smart faucet, which is connected to the water outlet. The smart faucet can accurately control the water output, avoid unnecessary waste, and improve water efficiency. The smart faucet can also reduce the number of times the hand touches the faucet through sensing technology, thereby avoiding the spread of bacteria and viruses, and is more hygienic and convenient. In addition, in a water purifier with a hot water making function, reducing the number of times the hand touches the faucet can also reduce the risk of being scalded by hot water.

[0018] 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.

[0019] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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,

[0021] Figure 1 A water circuit diagram of a water purifier according to an exemplary embodiment of the present application is shown.

[0022] The above drawings include the following reference numerals:

[0023] 100. Water purifier; 101. Raw water inlet; 102. Water outlet; 103. Concentrated water solenoid valve; 1041. First pipeline; 1042. Second pipeline; 1043. Third pipeline; 105. Normal temperature water pipeline; 106. Return pipeline; 110. Booster pump; 120. Filter device; 121. Raw water inlet; 122. Purified water outlet; 123. Concentrated water outlet; 130. Check valve; 140. Pressure detection device; 150. Water inlet solenoid valve; 160. Water outlet solenoid valve; 170. Zero pressure valve; 180. Flow meter; 190. Pre-filter element; 210. Flow control pump; 220. Heater; 230. Smart faucet. DETAILED DESCRIPTION

[0024] 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.

[0025] According to an embodiment of the present utility model, a water purifier 100 is provided. Figure 1 As shown, the water purifier 100 has a raw water inlet 101 and a water outlet 102, and the raw water inlet 101 can obtain raw water from a municipal water supply or other suitable water source. The water purifier 100 may also include a filter 120, and the filter 120 may include a raw water inlet 121 and a clean water outlet 122. The raw water inlet 121 of the filter 120 may be connected to the raw water inlet 101 through a first pipeline 1041, and the clean water outlet 122 of the filter 120 may be connected to the water outlet 102. Exemplarily, the filter 120 may include, for example, one or more of a reverse osmosis filter element, a nanofiltration filter element, an activated carbon filter element, a PP filter element, and a ceramic filter element. The water purifier 100 may also include a zero pressure valve 170, a flow control pump 210, and a heater 220. The inlet of the zero-pressure valve 170 is connected to the clean water outlet 122 of the filter device 120 through the second pipeline 1042, and the outlet of the zero-pressure valve 170 is connected to the inlet of the flow control pump 210 through the third pipeline 1043, and the outlet of the flow control pump 210 is connected to the inlet of the heater 220, and the outlet of the heater 220 is connected to the water outlet 102. The water pump of the desired flow rate can be delivered to the heater 220 by the flow control pump 210, so that the outlet water temperature can be accurately controlled. However, the flow control pump 210 has certain requirements for the pressure at its inlet to achieve precise flow control, so a zero-pressure valve 170 is set upstream of the flow control pump 210, and the downstream flow of the zero-pressure valve 170 will not be affected by the upstream pressure fluctuation, and the pipeline does not need to be pressurized. When the water purifier 100 is required to provide hot water, clean water can be extracted from the outlet of the zero-pressure valve 170 by the flow control pump 210 and pumped to the water outlet 102. However, the zero-pressure valve 170 may fail and lose its water-locking function, causing the water pressure downstream of the zero-pressure valve 170 to increase sharply.

[0026] The water purifier 100 may further include a pressure detection device 140, which is connected to the third pipeline 1043. The pressure detection device 140 can detect the water pressure in the third pipeline 1043. The "detection" mentioned above includes that the pressure detection device 140 can detect the specific size of the water pressure in the third pipeline 1043, or detect whether the water pressure in the third pipeline 1043 is within a preset range (for example, whether it is greater than a certain value).

[0027] Exemplarily, the water purifier 100 may further include a water inlet control device, which is arranged on the first pipeline 1041 or the second pipeline 1042, and the water inlet control device is used to control the on-off of the water circuit inside the water purifier. The water inlet control device blocks the water flow when the water pressure detected by the pressure detection device 140 is greater than the preset water pressure threshold. The preset water pressure threshold is greater than or equal to the rated water outlet pressure of the zero-pressure valve 170. When the zero-pressure valve 170 fails, the water pressure in the second pipeline 1042 enters the third pipeline 1043, causing the water pressure in the third pipeline 1043 to increase. When the water pressure in the third pipeline 1043 is greater than the preset water pressure threshold, the water inlet control device blocks the water flow. When the water inlet control device is located in the first pipeline 1041, the water inlet control device blocks the water flow from entering the filter device 120, so that the water pressure in the third pipeline 1043 stops increasing. When the water inlet control device is located in the second pipeline 1042, the water inlet control device can directly prevent the water pressure in the second pipeline 1042 from entering the third pipeline 1043, thereby preventing the water pressure in the third pipeline 1043 from increasing. In any of the above situations, the water purifier 100 will stop discharging hot water, so the user can be prompted that the machine is faulty so that the zero pressure valve 170 can be repaired.

[0028] Exemplarily, the water purifier 100 may further include a heater 220, the inlet of the heater 220 is connected to the outlet of the flow control pump 210, and the outlet of the heater 220 is connected to the water outlet 102. The heater 220 is used to heat the water flowing through the heater 220. Exemplarily, the heater 220 may be one or more of a resistance heater, a carbon fiber heater, a quartz tube heater, a ceramic heater, a thick film heater, and the like.

[0029] Exemplarily, when the filter device 120 is a reverse osmosis filter element, the municipal water pressure cannot meet the working water pressure of the reverse osmosis filter element. Therefore, the water needs to be pressurized before entering the reverse osmosis filter element. In this case, a booster pump 110 can be set on the first pipeline 1041 to provide the required water pressure for the reverse osmosis filter element. The pressure before the booster pump 110 is generally about equal to the tap water pressure (0.24Mpa), and the pressure after the booster pump 110 can reach 0.7-0.8Mpa. If there is no other outlet flow after the membrane, the pressure will slowly approach 0.7-0.8Mpa. The maximum water flow rate of the heater 220 is about 0.8L / min, and the water production efficiency of the reverse osmosis filter element is 1.6L / min, taking 600G as an example. At this time, a return line 106 can be added to return the surplus water flow to the front of the booster pump 110, so that the water inlet pressure of the zero-pressure valve 170 can be maintained at about 0.4Mpa. Normally, the maximum water-locking pressure of the zero-pressure valve 170 is about 0.6 MPa. For example, the rated water outlet pressure of the zero-pressure valve 170 is 0.02 MPa. If the zero-pressure valve 170 fails, the water inlet pressure of the flow control pump 210 is about 0.4 MPa. This may cause the pumping flow of the flow control pump 210 to be inaccurate.

[0030] The water pressure of municipal tap water is about 0.24Mpa. The water pressure of tap water varies according to the region and floor. For the filter device 120 that does not require the booster pump 110 to increase pressure, the water pressure after the filter device 120 is reduced pressure may be different for the filter device 120 in the same condition due to the different use regions and floors. Moreover, as the filter device 120 is used for a longer time, its pressure reduction effect becomes more and more obvious, so the water pressure of the clean water outlet 122 of the filter device 120 may change, and therefore, it may affect the flow rate of the flow control pump 210, making it impossible to accurately adjust the hot water temperature.

[0031] As described above, when the rated outlet water pressure of the zero-pressure valve 170 is 0.02Mpa, the water pressure of the third pipeline 1043 is less than or equal to 0.02Mpa under the action of the zero-pressure valve 170 when the zero-pressure valve 170 is working normally (the zero-pressure valve 170 is not invalid). Exemplarily, the preset water pressure threshold can be set to any value greater than 0.02Mpa. It is understood that it is better to have a smaller difference between the preset water pressure threshold and the rated outlet water pressure of the zero-pressure valve 170, so as to be able to timely and accurately determine whether the zero-pressure valve 170 is faulty. However, due to manufacturing tolerances and other reasons, if the difference between the two is small, it may affect the normal use of the zero-pressure valve 170. Those skilled in the art can select a suitable value for the preset water pressure threshold as needed. It is understood that when the zero-pressure valve 170 fails, the water pressure in the third pipeline 1043 increases, which may have an impact on the downstream pipeline, which will be further described later. Therefore, the preset water pressure threshold should not be set too large.

[0032] The present application detects the water pressure in the third pipeline 1043 by means of a pressure detection device 140 disposed downstream of the zero-pressure valve 170. When the water pressure is greater than a preset water pressure threshold, the water inlet control device blocks the water flow, thereby preventing the water pressure in the third pipeline 1043 from continuing to increase, protecting the third pipeline 1043 and the water path components on the third pipeline 1043, and extending the service life. In addition, when the water inlet control device blocks the water flow, the water purifier 100 cannot normally discharge hot water because the water inlet control device blocks the water flow, so it can remind the machine failure to a certain extent. If it is a problem with the zero-pressure valve 170, the zero-pressure valve 170 can be repaired or replaced. In this way, it can be avoided that the aging and failed zero-pressure valve 170 causes the flow control pump 210 to be unable to accurately pump water for the heater 220, thereby causing the hot water heated by the heater 220 to be inaccurate in temperature, and the user cannot obtain hot water of the required temperature from the water outlet 102.

[0033] Exemplarily, in the case where a booster pump 110 is provided on the first pipeline 1041, the water inlet control device may include the booster pump 110. When the water pressure in the third pipeline 1043 is greater than the preset water pressure threshold (i.e., the zero pressure valve 170 fails), the booster pump 110 may be turned off, and the water pressure no longer enters the filter device 120, the second pipeline 1042, and the third pipeline 1043 from the booster pump 110 in sequence, and the pressure in the third pipeline 1043 stops increasing. Optionally, a pre-filter element 190 may also be provided upstream of the filter device 120 for pre-filtering the water entering the filter device 120 to extend the service life of the filter device 120. The reverse osmosis filter element will produce a certain proportion of concentrated water during the filtration process, and the concentrated water produced may be discharged through the concentrated water outlet 123 and the concentrated water solenoid valve 103 in sequence. Therefore, a water inlet solenoid valve 150 may be provided on the first pipeline 1041 to avoid the waste of resources caused by the raw water flowing out of the concentrated water outlet 123 when the water purifier 100 is not working. In this case, the water inlet control device may include the water inlet solenoid valve 150 .

[0034] When the filter device 120 uses a filter element that does not require pressurization by the booster pump 110, the filter device 120 can filter the raw water by the water pressure of the municipal tap water. The water inlet control device may include a water inlet solenoid valve 150. When the zero pressure valve 170 fails, the water inlet solenoid valve 150 is closed, and the water pressure no longer enters the filter device 120, the second pipeline 1042 and the third pipeline 1043 from the water inlet solenoid valve 150 in sequence, and the pressure in the third pipeline 1043 stops increasing.

[0035] Exemplarily, the water purifier 100 may also include a reflux line 106, the inlet of the reflux line 106 is connected to the clean water outlet 122, the outlet of the reflux line 106 is connected to the inlet of the booster pump 110, and a check valve 130 is provided on the reflux line 106. For the water purifier 100 in which the heater 220 is an instant hot type, due to the power limitation of the heater 220, when the user needs to take hot water at a higher temperature, the heater 220 needs to control the water flow rate pumped by the flow pump 210 to heat the water to the temperature required by the user. The water production capacity of the filter device 120 is usually determined by the pumping water pressure of the booster pump 110 and the performance of the filter device 120 itself. In order to meet the working pressure of the filter device 120, the pumping water pressure of the booster pump 110 will not usually change. Therefore, the water production capacity of the filter device 120 will not usually change. Therefore, when the water flow required by the heater 220 is small, high pressure may accumulate between the clean water outlet 122 of the filter device 120 and the zero pressure valve 170 (if any) or between the clean water outlet 122 and the flow control pump 210. Continuous high pressure may cause the pipeline to rupture and damage the water path components on the pipeline. Figure 1 For this purpose, a reflux pipeline 106 can be provided between the clean water outlet 122 of the filter device 120 and the inlet of the booster pump 110, and a check valve 130 is provided on the reflux pipeline 106, so that when the water flow rate at the clean water outlet 122 of the filter device 120 is greater than the water output pumped by the flow control pump 210, the excess clean water is returned to the upstream of the booster pump 110 to participate in water production again. By releasing the excess clean water, the pipeline and the water channel components thereon can be protected and the service life can be extended. Preferably, when the water purifier 100 includes a reflux pipeline 106 and the water inlet control device is provided on the second pipeline 1042, the water inlet control device can be placed downstream of the inlet of the reflux pipeline 106. The water inlet control device can be a solenoid valve. When the water inlet control device is closed, the water pressure in the second pipeline 1042 can flow back to the upstream of the clean water outlet 122 through the reflux pipeline 106.

[0036] Exemplarily, the water purifier 100 also includes a controller. Exemplarily, the water purifier 100 may also include a controller. The controller may be constructed using electronic components such as a timer, a comparator, a register, 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. The controller may be electrically connected to the pressure detection device 140 and the water inlet control device. The controller is used to control the water inlet control device to close when the water pressure detected by the pressure detection device 140 is greater than the preset water pressure threshold. The control logic may be additionally set by the controller. In addition, the circuit fault may be eliminated by the controller, and abnormal conditions during the operation of the water purifier 100 may be discovered in time to improve the reliability and safety of the equipment. Specifically, the controller may determine that the zero pressure valve 170 fails according to the water pressure information detected by the pressure detection device 140, and control the panel of the water purifier 100 to display the fault information. It is convenient for users and maintenance personnel to eliminate and solve the faults of the water purifier 100.

[0037] Exemplarily, the pressure detection device 140 can be a low-pressure switch, which is configured to disconnect when the water pressure is higher than a preset water pressure threshold, and the water inlet control device is powered off when the low-pressure switch is disconnected. The low-pressure switch can be connected in series with the water inlet control device in the circuit. When the low-pressure switch detects that the water pressure in the third pipeline 1043 is higher than the preset water pressure threshold, the low-pressure switch is disconnected, the water inlet control device is closed, and the water flow is blocked. The low-pressure switch can also be electrically connected to the controller, and the low-pressure switch is disconnected when the water pressure is higher than the preset water pressure threshold. After receiving the electrical signal of the low-pressure switch disconnecting, the controller controls the water inlet control device to block the water flow. Pressure switches are usually low in cost and relatively simple to install and maintain.

[0038] At present, the heater 220 of the common water purifier 100 is usually made of stainless steel. The stainless steel heater 220 cannot match the pressure-bearing quick-connect joint structure, but uses a connecting pipe such as a silicone tube to directly cover the water inlet and outlet 102 of the heater 220. In other words, the joint of the connecting pipe is connected to the heater 220 by its own elasticity or the joint of the connecting pipe is fixed to the heater 220 by simple bundling. The silicone tube has the advantages of high temperature resistance, no pollution to the purified water, easy bending to reduce the occupied space, easy to sleeve on the joint, and low cost. In addition, the flow control pump 210 of the water purifier 100 can be a standard part, and the joint of the flow control pump 210 can be a trapezoidal joint. This joint can only be connected relatively simply under the premise of ensuring sealing when a silicone tube is used. The heater 220 is similar to it, so it is currently a common method to connect the waterway components in the heating module through a silicone tube. Under normal circumstances, the pipeline downstream of the zero-pressure valve 170 will hardly bear pressure, so the use of a silicone tube as a connecting pipe can meet current needs and is relatively low in cost.

[0039] Taking the complete failure of the zero-pressure valve 170 as an example, the pressure upstream of the zero-pressure valve 170 will directly enter its downstream, causing the silicone tube to be subjected to great pressure. Usually, the joint of the silicone tube and the flow control pump 210, or the joint of the silicone tube and the heater 220 will be disconnected first. In addition, the flow meter 180 and the like may also be included downstream of the zero-pressure valve 170, and the flow meter 180 is also usually connected through a silicone tube. Therefore, after the pressure upstream of the zero-pressure valve 170 enters the heating module, each silicone tube may fall off at the joint. In some cases, the silicone tube may not fall off from the joint, but the silicone tube itself may rupture. In either case, it may cause serious water leakage in the water purifier 100, or even an internal short circuit, leading to fire and electric shock.

[0040] Exemplarily, the third pipeline 1043 itself has a first bearing pressure, and the joint of the third pipeline 1043 has a second bearing pressure. Normally, the silicone tube and its joint can withstand a pressure of about 0.1Mpa. The joint of the third pipeline 1043 refers to the joint where the waterway components (including flow meter 180, flow control pump 210 and zero pressure valve 170, etc.) are connected to the third pipeline 1043. As mentioned above, the third pipeline 1043 usually adopts a silicone tube. Of course, in an embodiment not shown, the third pipeline 1043 can also adopt a pipeline of any suitable material such as PP pipe, PE pipe, etc. On the basis that the third pipeline 1043 is sleeved on the joint, in order to prevent loosening and water leakage, a tie or clamp can also be provided at the joint of the third pipeline 1043 at the joint, and the joint of the third pipeline 1043 is more reliably fixed to various waterway components.

[0041] When the water flowing through the third pipeline 1043 has a certain pressure, the third pipeline 1043 may expand under the pressure until it ruptures. The pressure that the third pipeline 1043 can withstand is the first bearing pressure. When the pressure that the third pipeline 1043 can withstand is less than the first bearing pressure, the third pipeline 1043 will not be damaged. When the pressure in the third pipeline 1043 is relatively high, it may also cause the joint of the third pipeline 1043 to expand, resulting in a reduction in the friction between the joint of the third pipeline 1043 and various waterway components, and the third pipeline 1043 falls off at the joint. The pressure that the joint of the third pipeline 1043 can withstand is called the second bearing pressure. Normally, the second bearing pressure is less than the first bearing pressure. During the process of pressure rise, when the pressure in the third pipeline 1043 is equal to or greater than the second bearing pressure, the joint of the third pipeline 1043 may fall off; and when the joint is fixed by a clamp, a cable tie or other structure, the second bearing pressure can be greater than the first bearing pressure, so the pressure that the third pipeline 1043 can withstand can be further increased, avoiding the joint of the third pipeline 1043 from falling off when the pressure in the third pipeline 1043 is very small. When the pressure in the third pipeline 1043 is greater than or equal to the first bearing pressure, the third pipeline 1043 will rupture due to the material being unable to withstand the pressure. Therefore, the preset water pressure threshold can be set to be no greater than any one of the first bearing pressure and the second bearing pressure, so that when the third pipeline 1043 itself and the joint of the third pipeline 1043 have not reached the maximum bearing pressure, the water flow is blocked by the water inlet control device to prevent the third pipeline 1043 from rupturing and leaking, and / or the joint of the third pipeline 1043 from falling off.

[0042] Exemplarily, the water purifier 100 may also include a flow meter 180, which is connected to the third pipeline 1043 and is used to detect the water flow in the third pipeline 1043. The controller is electrically connected to the flow meter 180 and the flow control pump 210. The controller can be used to control the water inlet control device to block the water flow when the water flow is greater than the current flow of the flow control pump 210. When the silicone tube is used for a long time, aging may occur, so that the silicone tube or the joint of the silicone tube can withstand a pressure lower than the rated water outlet pressure of the zero-pressure valve 170. At this time, even if the zero-pressure valve 170 does not fail, the silicone tube may still leak or seep water. At this time, by comparing the water flow detected by the flow meter 180 and the current flow of the flow control pump 210, it can be determined whether there is a leak in the third pipeline 1043. Specifically, when the water flow detected by the flow meter 180 is greater than the current flow of the flow control pump 210, it means that water flows out between the flow meter 180 and the flow control pump 210. At this time, the controller can control the water inlet control device to block the water flow, further preventing the influence caused by the water leakage of the third pipeline 1043. Preferably, the controller can control the water inlet control device to block the water flow after the water flow detected by the flow meter 180 is greater than the current flow of the flow control pump 210 for a period of time, so as to prevent the fluctuation of the flow in the pipeline from interfering with the judgment of whether there is a water leakage.

[0043] Exemplarily, in any embodiment including a controller, the controller can be electrically connected to the flow control pump 210 and the heater 220. The controller can also control the pumping flow of the flow control pump 210 and / or the power of the heater 220 based on the flow information, so that the water temperature at the water outlet 102 reaches the target water intake temperature. Specifically, when the power of the heater 220 is determined, the greater the water flow through the heater 220, the lower the water outlet temperature of the heater 220; when the water flow through the heater 220 is determined, the greater the power of the heater 220, the lower the water outlet temperature of the heater 220. The flow control pump 210 controls the flow of the clean water to be heated and the power of the heater 220 to ensure that the output water temperature reaches the target water intake temperature.

[0044] Exemplarily, the flow control pump 210 can be configured to stop water flow when it stops working. In this way, the water flow can be stopped to prevent water leakage when the water outlet 102 of the water purifier 100 is connected to the smart faucet 230.

[0045] For example, reference Figure 1, the water purifier 100 may also include a normal temperature water pipeline 105 connected between the clean water outlet 122 of the filter 120 and the water outlet 102. The water purifier 100 may be provided with a hot water pipeline formed by the second pipeline 1042 and the third pipeline 1043 in series. Therefore, the hot water pipeline is connected between the clean water outlet 122 of the filter 120 and the water outlet 102. The normal temperature water pipeline 105 can be connected in parallel with the hot water pipeline, so that the normal temperature water pipeline 105 is used to transport the normal temperature water to the water outlet 102 for users to use. Exemplarily, the normal temperature water pipeline 105 may not be connected in parallel with the hot water pipeline, and the water purifier 100 may have two water outlets 102, the normal temperature water outlet 102 and the hot water outlet 102. The normal temperature water pipeline 105 directly uses the pressure in the filter 120 to transport the normal temperature water to the water outlet 102, and the waterway is simpler and more efficient, while saving energy. Preferably, a water outlet solenoid valve 160 may be provided on the normal temperature water pipeline 105, and the water outlet solenoid valve 160 may be closed when the booster pump 110 stops working. This prevents the user from continuously leaking water from the water outlet 102 due to the pressure still in the filter device 120 after the normal temperature water is taken. Of course, the unheated purified water may also be directly delivered to the water outlet 102 using a hot water pipeline. Specifically, when the user needs normal temperature water, the controller may control the heater 220 not to work, and deliver the water to the water outlet 102 via the flow control pump 210 using the flow control pump 210. Using a hot water pipeline to provide users with normal temperature water makes the structure of the water purifier 100 simpler and more compact.

[0046] Exemplarily, the water purifier 100 may further include an intelligent faucet 230 connected to the water outlet 102. The intelligent faucet 230 may accurately control the water output, avoid unnecessary waste, and improve water efficiency. The intelligent faucet 230 may also reduce the number of times the hand touches the faucet through sensing technology, thereby avoiding the spread of bacteria and viruses, and is more hygienic and convenient. In addition, in the water purifier 100 with a hot water making function, reducing the number of times the hand touches the faucet may also reduce the risk of being scalded by hot water.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 and a water outlet, characterized in that: It includes a filtering device, a water inlet control device, a zero pressure valve, a pressure detection device, a flow control pump and a heater, wherein: The filter device comprises a raw water inlet and a purified water outlet, and the raw water inlet of the filter device is connected to the raw water inlet through a first pipeline; The inlet of the zero-pressure valve is connected to the purified water outlet of the filter device through a second pipeline, the outlet of the zero-pressure valve is connected to the inlet of the flow control pump through a third pipeline, the outlet of the flow control pump is connected to the inlet of the heater, and the outlet of the heater is connected to the water outlet, so as to heat the water flowing through the heater, and the pressure detection device is connected to the third pipeline; The water inlet control device is arranged on the first pipeline or the second pipeline, and the water inlet control device blocks the water flow when the water pressure detected by the pressure detection device is greater than a preset water pressure threshold, and the preset water pressure threshold is greater than or equal to the rated water outlet pressure of the zero-pressure valve.

2. The water purifier according to claim 1, characterized in that: The water inlet control device also includes: a booster pump, the booster pump being arranged on the first pipeline; and / or A water inlet solenoid valve is arranged on the first pipeline.

3. The water purifier according to claim 1, characterized in that: The water inlet control device further comprises a booster pump, and the booster pump is arranged on the first pipeline; The water purifier further comprises a reflux pipeline, the inlet of the reflux pipeline is connected to the purified water outlet, the outlet of the reflux pipeline is connected to the inlet of the booster pump, and a check valve is arranged on the reflux pipeline.

4. The water purifier according to claim 1, characterized in that: The water purifier also includes a controller, which is electrically connected to the pressure detection device and the water inlet control device, and is used to control the water inlet control device to close when the water pressure is greater than the preset water pressure threshold.

5. The water purifier according to claim 1, characterized in that: The pressure detection device is a low-pressure switch, and the low-pressure switch is configured to be disconnected when the water pressure is higher than a preset water pressure threshold, and the water inlet control device is powered off when the low-pressure switch is disconnected.

6. The water purifier according to claim 1, characterized in that: The third pipeline itself has a first bearing pressure, the joint of the third pipeline has a second bearing pressure, and the preset water pressure threshold is not greater than any one of the first bearing pressure and the second bearing pressure.

7. The water purifier according to claim 6, characterized in that: The joint of the third pipeline is fixed by a cable tie.

8. The water purifier according to claim 1, characterized in that: The water purifier also includes: a flow meter connected to the third pipeline and used to detect the water flow in the third pipeline; and a controller, the controller being electrically connected to the flow meter and the flow control pump; Wherein, the controller is used to control the water inlet control device to block the water flow when the water flow rate is greater than the current flow rate of the flow control pump.

9. The water purifier according to claim 1, characterized in that: The flow control pump is configured to prevent water from flowing through when the pump stops working; and / or The water purifier further comprises a normal temperature water pipeline, the normal temperature water pipeline is connected between the purified water outlet and the water outlet of the filtering device, and a water outlet solenoid valve is arranged on the normal temperature water pipeline.

10. The water purifier according to claim 1, characterized in that: The water purifier also includes an intelligent faucet connected to the water outlet.

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