CN218372007U

CN218372007U - Ultraviolet ray temperature compensation dechlorination device and water treatment equipment for hemodialysis

Info

Publication number: CN218372007U
Application number: CN202222205892.1U
Authority: CN
Inventors: 徐晓东; 赵会涛; 卢红敏
Original assignee: Kaineng Kangdewei Health Technology Beijing Co ltd
Current assignee: Kaineng Kangdewei Health Technology Beijing Co ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2023-01-24
Anticipated expiration: 2032-08-22

Abstract

The embodiment of the utility model provides an ultraviolet ray temperature compensation dechlorination device and hemodialysis water treatment facilities. The ultraviolet temperature compensation dechlorination device comprises: the water inlet and outlet device comprises a shell, wherein an accommodating cavity is formed in the shell, and a first mounting hole, a water inlet and a water outlet are formed in the shell; a three-way valve having a first conduction state in which the water outlet is conducted with the RO host and a second conduction state in which the water outlet is conducted with the water inlet; the ultraviolet lamp is positioned in the accommodating cavity and extends along the height direction of the shell, and the ultraviolet lamp is connected with the shell; the temperature sensor is connected with the shell through the first mounting hole; and the controller is electrically connected with the temperature sensor, the ultraviolet lamp and the three-way valve.

Description

Ultraviolet ray temperature compensation dechlorination device and water treatment equipment for hemodialysis

Technical Field

The utility model relates to the technical field of medical water, in particular to an ultraviolet temperature compensation dechlorination device and water treatment equipment for hemodialysis.

Background

The hemodialysis water treatment equipment is an application equipment for providing pure water for dialysis for a dialysis machine, generally comprises a water pretreatment device and an RO (Reverse Osmosis) host machine, can provide water for dialysis for the dialysis machine, and has the advantages of humanized operation, intelligence, high efficiency, convenience and the like. The quality of water for hemodialysis is the most important part for ensuring the effect of dialysis treatment.

The water quality of the water for hemodialysis needs to meet certain requirements. In the related art, the most important point of ensuring the quality of water for hemodialysis is maintenance of RO, in addition to regular sterilization and disinfection of water treatment equipment and subsequent lines. And the most important of the RO host is maintenance of the RO membrane. Most commonly, a filtration system in the pretreatment system is used to ensure that the RO main machine feed water meets the RO membrane feed water requirement. The water is usually subjected to dechlorination treatment by adopting an activated carbon adsorption mode, and the water can flow into the RO host machine after the dechlorination is finished so as to avoid damaging the RO membrane. However, the method may cause chlorine removal failure due to the failure of the activated carbon, the short-time maintenance and the like, so that water with excessive residual chlorine content enters the RO main machine. The excessive content of residual chlorine can generate oxidation effect on the RO membrane of the RO host machine, thereby obviously reducing the working efficiency of the RO host machine. Meanwhile, bacteria are easy to breed after the active carbon adsorbs organic matters, and secondary pollution is generated, so that the equipment is not easily maintained, and the water quality is not improved.

In addition, in the RO main unit, the water yield of the RO membrane also decreases as the temperature of the inlet water decreases due to the characteristics of the RO membrane. In order to maintain the stability of water yield, the heater is used for heating the water entering the RO host machine in the related technology, so as to ensure the stability of the water inlet temperature, thus being not beneficial to saving energy.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide an ultraviolet ray temperature compensation dechlorination device and hemodialysis water treatment facilities to when realizing dechlorinating water, the temperature of control entering RO host computer. The specific technical scheme is as follows:

the embodiment of the first aspect of the present application provides an ultraviolet ray temperature compensation dechlorination device, which is applied to a hemodialysis water treatment apparatus, wherein the hemodialysis water treatment apparatus comprises a water pretreatment device and an RO host. Ultraviolet ray temperature compensation dechlorination device includes:

the water pretreatment device comprises a shell, wherein an accommodating cavity is formed in the shell, a first mounting hole, a water inlet and a water outlet are formed in the shell, the water inlet is used for being communicated with the water pretreatment device, and the water outlet is used for being communicated with the RO host;

a three-way valve having a first conduction state that conducts the water outlet and the RO host and a second conduction state that conducts the water outlet and the water inlet;

the ultraviolet lamp is positioned in the accommodating cavity and extends along the height direction of the shell, and the ultraviolet lamp is connected with the shell;

the temperature sensor is connected with the shell through the first mounting hole and used for detecting the water temperature in the accommodating cavity and sending a temperature signal representing the water temperature; and

and the controller is electrically connected with the temperature sensor, the ultraviolet lamp and the three-way valve.

This application is through holding the mode that the intracavity set up ultraviolet lamp to realize the purpose that aquatic chlorine residue was eliminated. Compared with an activated carbon adsorption mode, the method has the advantages that the problem of adsorption saturation is solved, so that the possibility of chlorine removal failure is reduced, and the stability of chlorine removal is improved. On the other hand, the problem that bacteria are easy to breed does not exist, and the ultraviolet light can further inactivate microorganisms in the soft water, so that the probability of secondary pollution is favorably reduced, and the water quality of hemodialysis water is favorably improved. In addition, the ultraviolet temperature compensation dechlorination device of this application embodiment still is provided with the temperature compensation function to improve the water efficiency and the stability of RO host computer. After the controller receives a water temperature signal in the accommodating cavity, the three-way valve of the ultraviolet temperature compensation dechlorination device can be controlled to switch between a first conduction state and a second conduction state according to the water temperature, and the ultraviolet lamp can be controlled to switch between an on state and an off state. When the ultraviolet lamp is turned on, the water is heated, and when the ultraviolet lamp is turned off, the water is naturally cooled. Therefore, water at a proper water temperature can enter the RO host machine, and the water at an improper water temperature circulates at the water outlet, the water inlet and the accommodating cavity of the ultraviolet temperature compensation dechlorination device until the water temperature meets the optimal working temperature of the RO host machine. Therefore, through the mode of ultraviolet light dechlorination, need not additionally set up the heater, can carry out make full use of to ultraviolet lamp's heat to still be favorable to improving the play water efficiency of RO host computer, the energy saving.

The ultraviolet temperature compensation dechlorination device according to the embodiment of the application can also have the following technical characteristics:

in some embodiments of the present application, the housing is further provided with a second mounting hole, and the second mounting hole is located at the top of the housing;

the ultraviolet temperature compensation dechlorination device further comprises a first liquid level sensor and a water inlet valve, the first liquid level sensor is connected with the shell through the second mounting hole, and the water inlet valve is used for being communicated with the water inlet;

the controller is electrically connected with the water inlet valve and the first liquid level sensor, and the first liquid level sensor is used for monitoring a first liquid level of the accommodating cavity.

In some embodiments of the present application, a third mounting hole is further disposed on the housing, and the third mounting hole is located at the bottom of the housing;

the ultraviolet temperature compensation dechlorination device further comprises a second liquid level sensor, and the second liquid level sensor is connected with the shell through the third mounting hole;

the controller is also electrically connected with the second liquid level sensor, and the second liquid level sensor is used for monitoring the second liquid level of the accommodating cavity.

In some embodiments of this application, the casing include the base, with the tube-shape curb plate that the base is connected and with the roof that the curb plate is connected, be provided with first ultraviolet lamp mount pad on the base, the roof is close to one side of base is provided with the second ultraviolet lamp mount pad, ultraviolet lamp's both ends respectively with first ultraviolet lamp mount pad and the second ultraviolet lamp mount pad is connected.

In some embodiments of the present application, the ultraviolet temperature compensation dechlorination device further comprises a quartz sleeve coated on the ultraviolet lamp.

In some embodiments of the present application, a through hole is provided on the top plate, the ultraviolet temperature compensation dechlorination device further comprises a cleaner, the cleaner comprises a first end for cleaning and a second end extending along the height direction of the housing, the first end is slidably sleeved on the quartz sleeve, and the second end extends out of the accommodating cavity through the through hole.

The embodiment of the second aspect of the present application provides a hemodialysis water treatment apparatus, which comprises a water pretreatment device, a residual chlorine detection element, an RO host machine and the ultraviolet temperature compensation dechlorination device of the first aspect;

the water pretreatment device is communicated with the water inlet of the ultraviolet temperature compensation dechlorination device and is used for converting raw water into soft water;

the three-way valve is provided with a first port, a second port and a third port, the first port is communicated with the water outlet, the second port is communicated with the RO host machine, and the third port is communicated with the water inlet;

the residual chlorine detection element is arranged between the first port and the water outlet and is configured to detect the residual chlorine content of the water flowing out of the water outlet and send out a concentration signal representing the residual chlorine content;

the controller is electrically connected with the residual chlorine detection element and the three-way valve.

In the hemodialysis water treatment apparatus of the present embodiment, in a first aspect, the hemodialysis water treatment apparatus has an ultraviolet dechlorination function. Through the mode that sets up ultraviolet lamp in holding the intracavity to realize the purpose that aquatic chlorine residue was eliminated. Compared with an activated carbon adsorption mode, the method has the advantages that the problem of adsorption saturation is solved, so that the possibility of chlorine removal failure is reduced, and the stability of chlorine removal is improved. On the other hand, the problem that bacteria are easy to breed does not exist, and the ultraviolet light can further inactivate microorganisms in the soft water, so that the probability of secondary pollution is favorably reduced, and the water quality of hemodialysis water is favorably improved. In the second aspect, the water treatment apparatus for hemodialysis further has a temperature compensation function. The controller is connected with ultraviolet lamp, temperature sensor and three-way valve electricity to the realization is to the control of the temperature that gets into the RO host computer, also realizes the temperature compensation function, thereby can carry out make full use of to ultraviolet lamp's heat, is favorable to improving hemodialysis water treatment facility's play water efficiency, the energy saving. In a third aspect, the water treatment apparatus for hemodialysis further has a chlorine content detection function. Through the chlorine content detection function, the possibility of the over-standard chlorine content condition is favorably reduced, the probability of oxidization of the RO membrane of the RO host machine due to the over-standard chlorine content is favorably reduced, the working efficiency and the service life of the RO host machine are improved, and the reliability and the service life of the hemodialysis water treatment equipment are favorably improved.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other embodiments can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic cross-sectional view of an ultraviolet thermal compensation dechlorination apparatus according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of another view of the UV temperature compensation dechlorination apparatus according to the embodiment of the present application;

FIG. 3 is a graph of wavelength as a function of molar absorption coefficient;

FIG. 4 is a schematic structural view of a water treatment apparatus for hemodialysis according to an embodiment of the present application;

fig. 5 is a flowchart of a driving method of the hemodialysis water treatment apparatus according to the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art based on the present application all belong to the protection scope of the present disclosure.

In the related art, the water for hemodialysis is usually subjected to dechlorination by means of activated carbon adsorption. However, this process may fail to remove chlorine due to failure of the activated carbon, lack of maintenance, etc. Bacteria are easy to breed after the active carbon adsorbs organic matters, and secondary pollution is generated, so that the maintenance of equipment and the improvement of water quality are not facilitated. In addition, in the RO (Reverse Osmosis) main unit, the water yield of the RO membrane also decreases as the temperature of the inlet water decreases. In order to maintain the stability of the water yield, the related art also uses a heater to heat the water, which is not beneficial to saving energy.

In view of the above problems, the embodiment of the first aspect of the present application provides an ultraviolet temperature compensation dechlorination device 10. The ultraviolet ray temperature compensation dechlorination device 10 is applied to the hemodialysis water treatment equipment 1, and the hemodialysis water treatment equipment 1 comprises a water pretreatment device and an RO host machine. As shown in fig. 1, 2 and 4, the ultraviolet temperature compensation dechlorination apparatus 10 includes a housing 20, a three-way valve 30, an ultraviolet lamp 40, a temperature sensor 50 and a controller 60. The housing 20 has an accommodating cavity 201 inside, and the housing 20 is provided with a first mounting hole 21, a water inlet 22 and a water outlet 23, wherein the water inlet 22 is used for communicating with the water pretreatment device 2, and the water outlet 23 is used for communicating with the RO host 3. The three-way valve 30 has a first conduction state in which the water outlet 23 is conducted to the RO host 3 and a second conduction state in which the water outlet 23 is conducted to the water inlet 22. The ultraviolet lamp 40 is located in the accommodating chamber 201 and extends along the height direction of the housing 20, and the ultraviolet lamp 40 is connected to the housing 20. The temperature sensor 50 is connected to the housing 20 through the first mounting hole 21, and the temperature sensor 50 is used for detecting the temperature of water in the accommodating chamber 201 and emitting a temperature signal representing the temperature of the water. The controller 60 is electrically connected to the temperature sensor 50, the ultraviolet lamp 40, and the three-way valve 30.

As shown in fig. 4, the water treatment apparatus for hemodialysis 1 is used to supply pure water to a dialysis machine, and thus has a high demand for water quality. The water pretreatment device 2 is used for performing primary treatment on raw water, so that larger particles, suspended matters, calcium and magnesium ions in the raw water and the like can be removed. Raw water means water without any treatment. The RO main unit 3 is a unit for performing water treatment by using the reverse osmosis principle. The core element of the reverse osmosis host is an RO membrane in the reverse osmosis host. Reverse osmosis is a membrane separation technique that uses pressure as a driving force by virtue of the function of a permselective (semi-permeable) membrane. When the pressure applied in the system is larger than the osmotic pressure of the water inlet solution, water molecules can continuously permeate the RO membrane and flow out from the water outlet end of the RO membrane, thereby achieving the purpose of purifying water. The water from the RO main machine 3 is pure water.

In order to pretreat raw water, various chemical or physical adsorbents are generally added to the water pretreatment device 2. Among them, chlorine disinfectant is a commonly used chemical agent. Chlorine disinfectant can generate chlorine with oxidizing ability when added into water, and when the chlorine contacts with the water for a certain time, microorganisms, organic matters, inorganic matters and the like in the water can consume a part of the chlorine. Among them, the residual chlorine is referred to as residual chlorine. The residual chlorine is mainly hypochlorous acid (HOCl) and hypochlorite (OCl) ^- ) Etc. are present free in water. The water coming out after passing through the water pretreatment device 2 is called soft water.

The ultraviolet temperature compensation dechlorination device 10 of the embodiment of the application can dechlorination the soft water coming out of the water pretreatment device 2. Specifically, the ultraviolet temperature compensation dechlorination apparatus 10 includes a housing 20 and an ultraviolet lamp 40. The housing 20 has a hollow structure and an accommodating chamber 201 therein. The housing 20 is provided with a water inlet 22 and a water outlet 23. As shown in fig. 4, the water inlet 22 is used to communicate with the water pretreatment device 2, so that the water in the water pretreatment device 2 enters the accommodating chamber 201 through the inlet port 2. The ultraviolet lamp 40 is disposed in the accommodation chamber 201 and extends in a height direction of the housing 20, that is, the ultraviolet lamp 40 is located inside the housing 40 and is disposed vertically. It is understood that in other embodiments, the ultraviolet lamp 40 may be disposed horizontally or obliquely, as long as it is located in the accommodating chamber 201 and fixedly connected to the housing 20, and the present application is not limited thereto.

The ultraviolet radiation light emitted from the ultraviolet lamp 40 may undergo a photolytic reaction with residual chlorine in the soft water, thereby eliminating chlorine in the soft water. The photolysis reaction formula of residual chlorine is as follows:

2(HOCl)+2H ⁺ +4e ^- ——2Cl ^- +O ₂

2(HOCl)——2H ⁺ +2Cl ^- +O ₂

2OCl ^- ——2Cl ^- +O ₂

⁰ Cl+HOCl——HCl+ ⁰ OCl

⁰ Cl+OCl ^- ——Cl ^- + ⁰ OCl

from the above reaction formula, residual chlorine can be photolyzed by ultraviolet light into chlorine ions having no oxidizing ability and oxygen. Therefore, this application utilizes the radiation of ultraviolet ray light through the mode that sets up ultraviolet lamp in holding chamber 201 to realize the purpose that the aquatic residual chlorine was eliminated. When the ultraviolet lamp 40 is operated for about 10S, the state of disinfection and dechlorination is entered. Compared with an activated carbon adsorption mode, the method has the advantages that the problem of adsorption saturation is solved, so that the possibility of chlorine removal failure is reduced, and the stability of chlorine removal is improved. On the other hand, the problem that bacteria are easy to breed does not exist, and the ultraviolet light can further inactivate microorganisms in the soft water, so that the probability of secondary pollution is favorably reduced, and the water quality of hemodialysis water is favorably improved.

In addition, when the RO host machine performs reverse osmosis, the water yield of the RO membrane is reduced along with the reduction of the temperature of the inlet water. Generally, suitable operating temperatures for RO membranes are approximately 20 ℃ to 30 ℃. Therefore, the ultraviolet temperature compensation dechlorination device 10 of the embodiment of the present application is further provided with a temperature compensation function to improve the water outlet efficiency and stability of the RO host machine. The ultraviolet temperature compensation dechlorination device 10 realizes a temperature compensation function by arranging the temperature sensor 50, the three-way valve 30 and the controller 60. Specifically, the temperature sensor 50 is connected to the housing 20 through the first mounting hole 21, and the temperature sensor 50 can detect the temperature of the water in the accommodating cavity 201 and emit a temperature signal representing the temperature of the water. The controller 60 is electrically connected to the ultraviolet lamp 40, the temperature sensor 50 and the three-way valve 30, and the controller 60 is configured to receive the temperature signal and control the conduction state of the three-way valve 30 and the working state of the ultraviolet lamp 40 according to the magnitude relationship between the temperature signal and a preset first threshold and a preset second threshold, where the first threshold is smaller than the second threshold. The three-way valve 30 is a control member having three water inlets and outlets, and is switchable between a conducting state and a non-conducting state under the control of the controller 60. The three-way valve 30 has a first port 31, a second port 32, and a third port 33. As shown in fig. 4, the first port 31 is used for communicating with the water outlet 23 of the ultraviolet temperature compensation dechlorination device 10, the second port 32 is used for communicating with the RO mainframe 3, and the third port 33 is used for communicating with the water inlet 22 of the ultraviolet temperature compensation dechlorination device 10. Thereby, the three-way valve 30 has two conduction states of the first conduction state and the second conduction state. When the three-way valve 30 is in the first conduction state, it means that the water outlet of the ultraviolet temperature compensation dechlorination device 10 is conducted with the RO main machine, and the water of the ultraviolet temperature compensation dechlorination device 10 can enter the RO main machine 3. When the three-way valve 30 is in the second conduction state, it means that the water outlet 23 of the ultraviolet temperature compensation dechlorination device 10 is conducted with the water inlet 22 of the ultraviolet temperature compensation dechlorination device 10, and the water of the ultraviolet temperature compensation dechlorination device 10 flows into the water inlet 22 from the water outlet 23 to form a circulation.

The specific process for realizing the temperature compensation function is as follows: when the ultraviolet lamp 40 is operated to emit light, it generates heat, and the generated heat heats the water in the accommodating chamber 201. The temperature sensor 50 monitors the water temperature in the accommodating chamber 201 in real time and sends a water temperature signal. The controller 60 receives the temperature signal from the temperature sensor 50, and controls the on state of the three-way valve 30 and the operating state of the ultraviolet lamp 40 according to the magnitude relationship between the temperature signal and the preset first threshold and second threshold. Wherein the first threshold is less than the second threshold. That is, the controller 60 receives the water temperature signal in the receiving chamber 201, and then controls the three-way valve 30 of the ultraviolet temperature chlorine removal device 10 to switch between the first on state and the second on state according to the water temperature, and also controls the ultraviolet lamp 40 to switch between the on state and the off state. The water is heated when the ultraviolet lamp 40 is turned on, and the water is naturally cooled when the ultraviolet lamp 40 is turned off. Therefore, water with proper water temperature can enter the RO main machine, and water with improper water temperature can circulate in the water outlet 23, the water inlet 22 and the accommodating cavity 201 of the ultraviolet temperature compensation dechlorination device 10 until the water temperature meets the optimal working temperature of the RO main machine. Therefore, through the mode of ultraviolet light dechlorination, need not additionally set up the heater, can carry out make full use of to ultraviolet lamp's heat to still be favorable to improving the play water efficiency of RO host computer, the energy saving.

In the present application, the first threshold value and the second threshold value may be a lower limit value and an upper limit value of a suitable operating temperature of the RO membrane; alternatively, the controller 60 may be adapted to select two temperature thresholds having appropriate operating states for the RO main unit as the first threshold and the second threshold when the ultraviolet temperature compensation chlorine removal device 10 is operated. Those skilled in the art can flexibly decide according to the needs.

In some embodiments of the present application, when the temperature signal is smaller than the first threshold, the controller 60 controls the three-way valve 30 to be in the second conduction state, and controls the ultraviolet lamp 40 to be in the on state; when the temperature signal is greater than or equal to the first threshold and less than the second threshold, the controller 60 controls the three-way valve 30 to be in the first conduction state and controls the ultraviolet lamp 40 to be in the open state; when the temperature signal is greater than or equal to the second threshold, the controller 60 controls the three-way valve 30 to be in the second conduction state, and controls the ultraviolet lamp 40 to be in the off state.

The embodiment of the present application specifically describes the operation mode of the controller 60 of the ultraviolet temperature compensation dechlorination apparatus 10. In a specific embodiment, after tuning, the first threshold value may be set to 25 ℃ for one suitable operating temperature of the RO membrane and the second threshold value may be set to 30 ℃ for another suitable operating temperature of the RO membrane. When the detected temperature signal is smaller than the first threshold value, the controller 60 controls the three-way valve 30 to be in the second conduction state, at this time, the water with the temperature smaller than the first threshold value flows into the water inlet 22 through the water outlet 23 and the three-way valve 30, and the water circulates in the ultraviolet temperature compensation dechlorination device 10. The controller 60 also controls the ultraviolet lamp 40 to be in an on state at this time, so that the circulating water can be continuously heated and dechlorinated. After heating for a period of time, when the temperature signal detected by the temperature sensor 50 is greater than or equal to the first threshold value and less than or equal to the second threshold value, the controller 60 controls the three-way valve 30 to be in the first conduction state, at this time, the water with the temperature of 25 ℃ to 30 ℃ flows into the RO host machine through the water outlet 23 and the three-way valve 30 to make water, and the ultraviolet lamp 40 is still in the working state to continuously remove chlorine from the water. When the ultraviolet lamp 40 continues to work and the water temperature is greater than or equal to the second threshold value, the controller 60 controls the three-way valve 30 to be in the second conduction state again, and at this time, the ultraviolet lamp 40 is also closed by the controller 60, so that the water is cooled in the circulation until the water temperature is between the preset first threshold value and the second threshold value or the water temperature is less than the first threshold value. In one embodiment, when the apparatus is just started in winter, if the temperature of the raw water is too low, for example, below 15 ℃, the temperature compensation function of the ultraviolet temperature compensation dechlorination device 10 is turned on. The ultraviolet lamp 40 is turned on to remove chlorine and heat. At this time, the three-way valve 30 is opened in the second conduction state, and the water in the ultraviolet ray temperature compensation dechlorination apparatus 10 is circulated and heated. After the equipment is started for a period of time, because the ultraviolet lamp 40 works for a period of time, the heat emitted is stable and more, and part of water produced by the water treatment equipment flows back to the ultraviolet temperature compensation dechlorination device 10 in a circulating manner, the initial temperature of the water temperature is relatively higher, a first threshold value can be reached in a short time, the first conduction state of the three-way valve 30 is opened, the equipment is in a normal water making mode, and the first conduction state of the three-way valve 30 is in a normally open state. When the water temperature becomes higher and higher due to the increasing heat of the ultraviolet lamp 40, for example, the second threshold value is reached, the ultraviolet lamp 40 is turned off. At this time, the three-way valve 30 returns to the second conduction state. Then, the water temperature is returned to between the preset first threshold value and the second threshold value or is smaller than the first threshold value through natural cooling, water supplement into the ultraviolet temperature compensation dechlorination device 10 and the like. At this time, the ultraviolet lamp 40 is operated again, and the three-way valve 30 selects normal water production or circulates water in the ultraviolet temperature compensation dechlorination apparatus 10 according to the magnitude of the temperature signal.

Of course, the first threshold value and the second threshold value may have other values as long as the first threshold value and the second threshold value can satisfy stable operation of the water treatment apparatus for hemodialysis.

In some embodiments of the present application, to further enhance the photolytic effect of the uv light on the residual chlorine, the uv lamp 40 may be a medium-pressure uv lamp, the inside of which is filled with an inert gas with a pressure equal to the atmospheric pressure, and the internal pressure of which is: 0.2-0.4 MPa. Medium-pressure uv lamps can emit radiation in the wavelength range between 200nm and 400 nm. In the related art, the low-pressure ultraviolet lamp is activated by using lower mercury vapor pressure (less than 10 < -2 > Pa) to emit ultraviolet light, and the emission lines of the low-pressure ultraviolet lamp mainly have two wavelengths of 253.7nm and 185nm, so that the low-pressure ultraviolet lamp is not beneficial to absorbing residual chlorine. Therefore, this application uses medium pressure ultraviolet lamp to be favorable to improving the dechlorination effect.

As shown in FIG. 3, the wavelength and residual chlorine of HOCl and OCl ^- A graph showing a relationship between molar absorptivities of (a) and (b). The molar absorption coefficient of HOCl is shown in the dark color and the OCl is shown in the light color ^- Is plotted as a function of wavelength. As can be seen from the figure, the radiation light in the wavelength range of 200nm-400nm is more easily absorbed by the residual chlorine in the soft water and is photolyzed, thereby being beneficial to improving the reliability and efficiency of chlorine removal.

Typically, medium pressure ultraviolet lamps operate at temperatures of from 5 ℃ to 40 ℃. Therefore, it is also advantageous to maintain the ultraviolet lamp 40 at a good working environment temperature by the temperature compensation function, thereby contributing to the improvement of the life of the ultraviolet lamp 40.

As shown in fig. 1, in some embodiments of the present application, a second mounting hole 24 is further disposed on the housing 20, and the second mounting hole 24 is located at the top of the housing 20. The ultraviolet temperature compensation dechlorination device 10 further comprises a first liquid level sensor 70 and a water inlet valve 80, wherein the first liquid level sensor 70 is connected with the shell 20 through the second mounting hole 24, and the water inlet valve 80 is used for being communicated with the water inlet 22. The controller 60 is electrically connected to the inlet valve 80 and the first level sensor 70. The first level sensor 70 is used to monitor a first liquid level of the receiving chamber 201. It should be noted that the first liquid level is the highest limit water level in the accommodating chamber 201, and if water is continuously added into the accommodating chamber 201, the accommodating chamber 201 is in danger of overflowing water.

The chlorine removal device 10 of the embodiment of the present application further includes a first liquid level sensor 70 and a water inlet valve 80. The first level sensor 70 is used to detect a first liquid level in the accommodating chamber 201, that is, when the water in the accommodating chamber 201 passes through the detection point of the first level sensor 70, it indicates that the water in the accommodating chamber 201 is at the first liquid level at this time, that is, at the highest limit water level. At this time, after the controller 60 receives the maximum limit water level signal, the water inlet valve 80 is controlled to close, so that the water inlet 22 does not continue to feed water. When the water in the accommodating chamber 201 does not pass the detection point of the first level sensor 70, it indicates that the water in the accommodating chamber 201 has not reached the maximum limit water level at this time. At this time, the controller 60 does not receive the maximum limit water level signal, and the water inlet valve 80 is continuously opened to continuously add water into the accommodating chamber 201 through the water inlet 22. By arranging the first liquid level sensor 70 and the water inlet valve 80, the embodiment of the application is favorable for controlling the water level in the accommodating cavity 201, the probability of overflow and other conditions caused by the fact that the accommodating cavity 201 is full of water is reduced, and further the water source is favorably saved.

Further, in some embodiments, a third mounting hole 25 is further disposed on the housing 20, and the third mounting hole 25 is located at the bottom of the housing 20. The ultraviolet temperature compensation dechlorination device 10 further comprises a second liquid level sensor 71, the second liquid level sensor 71 is connected with the housing 20 through a third mounting hole 25, and the controller 60 is further electrically connected with the second liquid level sensor 71. The second liquid level sensor 71 is used for monitoring the second liquid level of the accommodating cavity 201. The second liquid level is the lowest limit water level in the accommodating cavity 201, and if water is not added into the accommodating cavity 201, the water in the accommodating cavity 201 may run dry.

In order to avoid the occurrence of the dry condition, the second liquid level sensor 71 is further disposed on the ultraviolet temperature compensation dechlorination device 10 in the present embodiment. The second liquid level sensor 71 is located at the bottom of the housing. When the water in the accommodating chamber 201 does not exceed the detection point of the second liquid level sensor 71, and the second liquid level sensor 71 cannot monitor the second liquid level of the accommodating chamber 201, it indicates that the water level in the accommodating chamber 201 is below the lowest limit water level at this time. At this time, the second liquid level sensor 71 will send out a minimum limit water level signal to remind personnel to replenish water to the ultraviolet temperature compensation dechlorination device 10 in time. Thus, the intelligent and automatic device is improved. Meanwhile, due to the fact that the water amount in the accommodating cavity 201 is insufficient, the controller 60 can also control the ultraviolet lamp 40 to be turned off, invalid light emission of the ultraviolet lamp 40 is avoided, source energy saving is facilitated, and the service life of the ultraviolet lamp 40 is prolonged.

In some embodiments, in order to more accurately detect the water level in the accommodating chamber 201, as shown in fig. 1, a fourth mounting hole 26 and a third liquid level sensor 72 may be further provided, the fourth mounting hole 26 is located in the middle of the housing 20, and the third liquid level sensor 72 sends a middle liquid level signal. Of course, it is understood that the position and number of the liquid level sensors may be more, and the application is not limited thereto.

As shown in fig. 2, in some embodiments of the present application, the housing 20 includes a base 202, a cylindrical side plate 203 connected to the base 202, and a top plate 204 connected to the side plate 203. The base 202 is provided with a first ultraviolet lamp mounting seat 2021, one side of the top plate 204 close to the base 202 is provided with a second ultraviolet lamp mounting seat 2041, and two ends of the ultraviolet lamp 40 are respectively connected with the first ultraviolet lamp mounting seat 2021 and the second ultraviolet lamp mounting seat 2041. In the present embodiment, the housing 20 is a cylindrical housing, and the height thereof is larger than the diameter of the cylinder. The housing 20 may be made of a stainless steel material, such as 316L, to facilitate reducing the likelihood of scale formation. The housing 20 has a three-stage structure, and specifically includes a base 202, a cylindrical side plate 203, and a top plate 204. Both ends of the ultraviolet lamp 40 are respectively connected to the first ultraviolet lamp mounting seat 2021 of the base 202 and the second ultraviolet lamp mounting seat 2041 of the top plate 204, thereby being beneficial to improving the mounting firmness of the ultraviolet lamp 40. In other embodiments, the housing 20 may also be in other shapes such as a cube and a rectangular parallelepiped, and may also be assembled by using a three-section structure, which is not limited in this application.

As shown in fig. 2, in some embodiments, the second uv lamp mounting seat 2041 of the bottom plate 204 has a wire passing hole in the middle, and after the uv lamp 40 is mounted on the base, the power wire 400 of the uv lamp 40 can extend through the wire passing hole 2043 to be connected with an external power source.

In some embodiments, an air filter 300 is further mounted on a side surface of the top plate 204 facing away from the receiving cavity 201. Through setting up air cleaner 300, be favorable to keeping holding the equilibrium of the atmospheric pressure in the chamber 201 and outside atmospheric pressure, still be favorable to reducing the probability that the impurity of outside air pollutes water and takes place.

As shown in fig. 1, in some embodiments of the present application, an ultraviolet intensity detecting sensor 100 is further disposed on the housing 20 in order to further control the operating state of the ultraviolet lamp 40. The detection end of the ultraviolet intensity detection sensor 100 extends into the accommodation cavity 201 to detect the light intensity of the ultraviolet lamp 40. When the detected intensity of the ultraviolet light is reduced or even eliminated, it indicates that the ultraviolet lamp 40 needs to be replaced. This is also advantageous in improving the convenience and reliability of maintenance of the ultraviolet temperature compensation dechlorination apparatus 10.

As shown in fig. 1, in some embodiments of the present application, a conductivity sensor 200 is further disposed on the housing 20, and a detection end of the conductivity sensor 200 extends into the accommodating cavity 201 for detecting the conductivity of the water in the accommodating cavity 201 in real time. The less pure the water, the higher its conductivity at the same temperature. Through setting up conductivity sensor 200, be favorable to improving the reliability of controlling to the purity of holding the water in the chamber 201, and then be favorable to improving the reliability of ultraviolet temperature compensation dechlorination device 10.

In some embodiments of the present application, the ultraviolet temperature compensation dechlorination apparatus 10 further comprises a quartz sleeve 90 coated on the ultraviolet lamp 40. By providing a quartz sleeve 90, physical protection of the ultraviolet lamp 40 is facilitated.

As shown in fig. 2, in some embodiments of the present application, a through hole 2042 is provided on the top plate 204, the ultraviolet thermal compensation chlorine removal device 10 further includes a cleaner 91, the cleaner 91 includes a first end 911 for cleaning and a second end 912 extending along the height direction of the housing 20, the first end 911 is slidably sleeved on the quartz sleeve 90, and the second end 912 extends out of the accommodating cavity 201 through the through hole 2042. The present embodiment is also provided with a cleaner 91. When the ultraviolet ray temperature compensation dechlorination apparatus 10 is operated for a long time, scale may be generated on the outer wall of the quartz sleeve 90. Therefore, the scale can be cleaned by providing the cleaner 91. Specifically, the first end 911 of the cleaner 91 is slidably disposed on the quartz sleeve 90, and the second end 912 extends out of the accommodating cavity 201 through the through hole 2042. At this time, the cleaner can push and pull the second end 912 back and forth in the height direction, i.e. in the vertical direction, so as to drive the first end 911 to slide on the quartz sleeve 90, thereby cleaning the scale on the outer wall of the quartz sleeve 90. The provision of the cleaner 91 is advantageous for improving the convenience of maintenance of the ultraviolet temperature compensation dechlorination apparatus 10.

As shown in fig. 4, the embodiment of the second aspect of the present application provides a water treatment apparatus 1 for hemodialysis, which includes a water pretreatment device 2, a residual chlorine detection element 4, an RO main unit 3, and the ultraviolet temperature compensation dechlorination device 10 of the first aspect. The water pretreatment device 2 is communicated with the water inlet 22 of the ultraviolet temperature compensation dechlorination device 10, and the water pretreatment device 2 is used for converting raw water into soft water. The three-way valve 30 has a first port 31, a second port 32, and a third port 33, the first port 31 being in communication with the water outlet 23, the second port 32 being in communication with the RO host 3, and the third port 33 being in communication with the water inlet 22. The residual chlorine detecting element 4 is arranged between the first port 31 and the water outlet 23, and the residual chlorine detecting element 4 is configured to detect the residual chlorine content of the water flowing out of the water outlet 23 and to emit a concentration signal representing the residual chlorine content. The controller 60 is electrically connected to the residual chlorine detecting element 4 and the three-way valve 30, and the controller 60 is configured to receive a concentration signal.

The water treatment apparatus for hemodialysis 1 according to the present application uses the ultraviolet ray temperature compensation dechlorination device 10 to dechlorinate water discharged from the water pretreatment device 2. Wherein the water treatment apparatus for hemodialysis 1 further comprises a residual chlorine detecting element 4. The residual chlorine detecting element 4 can detect the residual chlorine content of the water flowing out of the water outlet 23 and send out a concentration signal representing the residual chlorine content. That is, the water treatment apparatus for hemodialysis 1 has a chlorine content detection function in addition to an ultraviolet light dechlorination function and a temperature compensation function. Specifically, the controller 60 is also electrically connected to the residual chlorine detecting element 4 and the three-way valve 30. The three-way valve 30 has a first port 31, a second port 32, and a third port 33. The first port 31 is communicated with the water outlet 23 of the ultraviolet temperature compensation dechlorination device 10, the second port 32 is communicated with the RO host machine 3, and the third port 33 is communicated with the water inlet 22 of the ultraviolet temperature compensation dechlorination device 10. Thereby, the three-way valve 30 has two conduction states of the first conduction state and the second conduction state. When the water in the accommodating cavity 201 is subjected to the dechlorination action of the ultraviolet light, the water flows out of the accommodating cavity 201 through the water outlet 23. The residual chlorine detecting element 4 detects the chlorine content of the water at the water outlet 23 and sends a concentration signal. After receiving the concentration signal of the residual chlorine in the water at the water outlet 23, the controller 60 controls the conduction state of the three-way valve 30 according to the magnitude relation between the concentration signal and the preset third threshold, and can control the three-way valve 30 of the ultraviolet temperature compensation dechlorination device 10 to switch between the first conduction state and the second conduction state according to the level of the residual chlorine content. Therefore, the water meeting the requirement of the residual chlorine content after chlorine removal can enter the RO host machine, and the water not meeting the requirement of the residual chlorine content circulates at the water outlet 23 and the water inlet 22 of the ultraviolet temperature compensation chlorine removal device 10 and the accommodating cavity 201 until the requirement of the residual chlorine content of the water entering the RO host machine is met. Generally, the residual chlorine content of the water entering the RO main unit is required to be 0.1ppm or less.

Therefore, in the present embodiment, in the first aspect, the water treatment apparatus for hemodialysis 1 has an ultraviolet light dechlorination function. The ultraviolet lamp 40 is arranged in the accommodating cavity 201, so that the purpose of eliminating residual chlorine in water is achieved. Compared with an activated carbon adsorption mode, the method has the advantages that the problem of adsorption saturation is solved, so that the possibility of chlorine removal failure is reduced, and the stability of chlorine removal is improved. On the other hand, the problem that bacteria are easy to breed does not exist, and the ultraviolet light can further inactivate microorganisms in the soft water, so that the probability of secondary pollution is favorably reduced, and the water quality of hemodialysis water is favorably improved. In the second aspect, the water treatment apparatus for hemodialysis 1 further has a temperature compensation function. The controller 60 is electrically connected with the ultraviolet lamp 40, the temperature sensor 50 and the three-way valve 30, so that the control of the water temperature entering the RO host machine is realized, the temperature compensation function is realized, the heat of the ultraviolet lamp can be fully utilized, the water outlet efficiency of the hemodialysis water treatment equipment 1 is improved, and the energy is saved. In the third aspect, the water treatment apparatus for hemodialysis 1 further has a chlorine content detecting function. Through the chlorine content detection function, the possibility of the over-standard chlorine content condition is favorably reduced, the probability of oxidization of the RO membrane of the RO host machine due to the over-standard chlorine content is favorably reduced, the working efficiency and the service life of the RO host machine are improved, and the reliability and the service life of the hemodialysis water treatment equipment 1 are favorably improved.

In some embodiments of the present application, when the concentration signal is greater than the third threshold, the controller 60 controls the three-way valve 30 to be in the second conduction state; when the concentration signal is equal to or less than the third threshold value, the controller 60 controls the three-way valve 30 to be in the first conduction state.

The application specifically describes the mode of operation of the chlorine content detection function. In a specific embodiment, the third threshold may be set to a concentration level of 0.01ppm. When the concentration signal is greater than the third threshold value, the controller 60 controls the three-way valve 30 to be in the second conduction state. At this time, the water circulates through the ultraviolet temperature compensation dechlorination apparatus 10 and does not enter the RO main unit. When the concentration signal detected at the water outlet is less than or equal to the third threshold, the controller 60 controls the three-way valve 30 to be in the first conduction state, and at this time, the water at the water outlet 23 can flow into the RO host. Of course, the third threshold may also be other values, and may be flexibly adjusted according to the device requirements, and the application is not limited in this application.

As shown in fig. 5, the driving method of the hemodialysis water treatment apparatus 1 of the present embodiment includes the steps of:

s1, detecting the water temperature in a containing cavity and sending a temperature signal representing the water temperature;

s2, detecting the chlorine content of water at a water outlet, and sending a concentration signal representing the chlorine content;

s3, when the temperature signal is smaller than the first threshold or the concentration signal is larger than a third threshold, the controller controls the three-way valve to be in a second conduction state;

and S4, when the temperature signal is greater than or equal to the first threshold and smaller than the second threshold and the concentration signal is smaller than or equal to the third threshold, the controller controls the three-way valve to be in a first conduction state.

The driving method of the hemodialysis water treatment apparatus 1 in the embodiment of the present application can realize the ultraviolet dechlorination function, the temperature compensation function and the chlorine content detection function of the hemodialysis water treatment apparatus 1. It is easily understood that, in the present application, the conduction state of the three-way valve 30 is controlled by two conditions, i.e., the temperature signal and the concentration signal. The temperature signal is a condition for controlling the on and off states of the ultraviolet lamp 40, and the concentration signal is independent of the on and off states of the ultraviolet lamp 40 and is related to only the state of the three-way valve 30. Specifically, the controller controls the three-way valve 30 to be in the second conduction state when the temperature signal is smaller than the first threshold value or when the concentration signal is larger than the third threshold value. At this time, the water temperature and the concentration do not meet the requirements, the three-way valve 30 is in the second conduction state, the ultraviolet lamp 40 is controlled by the temperature signal to be in the opening state, and the ultraviolet lamp 40 circularly heats the water to raise the temperature and remove chlorine. When the temperature signal is equal to or greater than the first threshold value and less than the second threshold value, and when the concentration signal is equal to or less than the third threshold value, the controller controls the three-way valve 30 to be in the first conduction state. That is, only when the two conditions of "the water temperature is between the first threshold and the second threshold" and "the chlorine content of the water is less than or equal to the third threshold" are satisfied at the same time, the three-way valve 30 is in the first conducting state, and the water at the water outlet 23 can enter the RO host. At this time, the ultraviolet lamp 40 satisfies a condition of "the water temperature is between the first threshold value and the second threshold value", and is in an on state, regardless of the concentration signal. When the temperature signal is equal to or greater than the second threshold, the ultraviolet lamp 40 is controlled by the temperature signal and is turned off by the controller 60, regardless of the concentration signal.

The driving method drives the hemodialysis water treatment equipment 1 to operate, so that the ultraviolet dechlorination function, the temperature compensation function and the chlorine content detection function of the hemodialysis water treatment equipment 1 are realized. The ultraviolet dechlorination function means dechlorination by ultraviolet light. Compared with an activated carbon adsorption mode, on one hand, the problem of adsorption saturation does not exist, so that the possibility of chlorine removal failure is reduced, and the stability of chlorine removal is improved. On the other hand, the problem that bacteria are easy to breed does not exist, and the ultraviolet light can further inactivate microorganisms in the soft water, so that the probability of secondary pollution is favorably reduced, and the water quality of hemodialysis water is favorably improved. The temperature compensation function can realize the control to the temperature that gets into the RO host computer to can carry out make full use of to ultraviolet lamp's heat, be favorable to improving hemodialysis water treatment facility 1's play water efficiency, the energy saving. The chlorine content detection function is favorable for reducing the possibility of the over-standard chlorine content condition, reducing the probability of oxidization of the RO membrane of the RO host machine due to the over-standard chlorine content, improving the working efficiency and the service life of the RO host machine, and further being favorable for improving the reliability and the service life of the hemodialysis water treatment equipment 1.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. An ultraviolet temperature compensation dechlorination device (10) applied to a hemodialysis water treatment apparatus (1), wherein the hemodialysis water treatment apparatus (1) comprises a water pretreatment device (2) and an RO host (3), and is characterized by comprising:

the water pretreatment device comprises a shell (20), wherein a containing cavity (201) is formed in the shell (20), a first mounting hole (21), a water inlet (22) and a water outlet (23) are formed in the shell (20), the water inlet (22) is used for being communicated with the water pretreatment device (2), and the water outlet (23) is used for being communicated with the RO host (3);

a three-way valve (30), wherein the three-way valve (30) has a first conduction state for conducting the water outlet (23) and the RO host machine (3) and a second conduction state for conducting the water outlet (23) and the water inlet (22);

an ultraviolet lamp (40) located in the accommodating chamber (201) and extending along the height direction of the housing (20), wherein the ultraviolet lamp (40) is connected with the housing (20);

a temperature sensor (50), wherein the temperature sensor (50) is connected with the shell (20) through the first mounting hole (21), and the temperature sensor (50) is used for detecting the water temperature in the accommodating cavity (201) and sending a temperature signal representing the water temperature; and

a controller (60), the controller (60) being electrically connected with the temperature sensor (50), the ultraviolet lamp (40), and the three-way valve (30).

2. The ultraviolet temperature-compensated chlorine removal device (10) as claimed in claim 1, wherein a second mounting hole (24) is further formed on the housing (20), and the second mounting hole (24) is located at the top of the housing (20);

the ultraviolet temperature compensation dechlorination device (10) further comprises a first liquid level sensor (70) and a water inlet valve (80), the first liquid level sensor (70) is connected with the shell (20) through the second mounting hole (24), and the water inlet valve (80) is used for being communicated with the water inlet (22);

the controller (60) is electrically connected with the water inlet valve (80) and the first liquid level sensor (70), and the first liquid level sensor (70) is used for monitoring a first liquid level of the accommodating cavity (201).

3. The ultraviolet temperature compensation dechlorination device (10) according to claim 2, wherein the housing (20) is further provided with a third mounting hole (25), and the third mounting hole (25) is located at the bottom of the housing (20);

the ultraviolet temperature compensation dechlorination device (10) further comprises a second liquid level sensor (71), and the second liquid level sensor (71) is connected with the shell (20) through the third mounting hole (25);

the controller (60) is also electrically connected to the second liquid level sensor (71), and the second liquid level sensor (71) is used for monitoring a second liquid level of the accommodating cavity (201).

4. The ultraviolet temperature compensation dechlorination device (10) of claim 1, wherein the housing (20) comprises a base (202), a cylindrical side plate (203) connected to the base (202), and a top plate (204) connected to the side plate (203), the base (202) is provided with a first ultraviolet lamp mounting seat (2021), one side of the top plate (204) close to the base (202) is provided with a second ultraviolet lamp mounting seat (2041), and two ends of the ultraviolet lamp (40) are respectively connected to the first ultraviolet lamp mounting seat (2021) and the second ultraviolet lamp mounting seat (2041).

5. The ultraviolet temperature compensation dechlorination device (10) of claim 4, characterised in that the ultraviolet temperature compensation dechlorination device (10) further comprises a quartz sleeve (90) coated on the ultraviolet lamp (40).

6. The ultraviolet temperature-compensated chlorine removal device (10) as claimed in claim 5, wherein a through hole (2042) is provided on the top plate (204), the ultraviolet temperature-compensated chlorine removal device (10) further comprises a cleaner (91), the cleaner (91) comprises a first end (911) for cleaning and a second end (912) extending along the height direction of the housing (20), the first end (911) is slidably sleeved on the quartz sleeve (90), and the second end (912) extends out of the accommodating cavity (201) through the through hole (2042).

7. A water treatment apparatus (1) for hemodialysis, comprising a water pretreatment device (2), a residual chlorine detection element (4), an RO main unit (3), and an ultraviolet ray temperature compensation dechlorination device (10) according to any one of claims 1 to 6;

the water pretreatment device (2) is communicated with the water inlet (22) of the ultraviolet temperature compensation dechlorination device (10), and the water pretreatment device (2) is used for converting raw water into soft water;

the three-way valve (30) is provided with a first port (31), a second port (32) and a third port (33), wherein the first port (31) is communicated with the water outlet (23), the second port (32) is communicated with the RO host machine (3), and the third port (33) is communicated with the water inlet (22);

the residual chlorine detection element (4) is arranged between the first port (31) and the water outlet (23), and the residual chlorine detection element (4) is configured to detect the residual chlorine content of the water flowing out of the water outlet (23) and send out a concentration signal representing the residual chlorine content;

the controller (60) is electrically connected with the residual chlorine detection element (4) and the three-way valve (30).