Small ultrapure water machine

Abstract

The utility model provides a small ultrapure water machine, which comprises a shell and a water outlet valve arranged on the shell, and also comprises two filtering components with the same structure, the liquid inlet ends of the filtering components are connected with liquid inlet pipes, and the liquid outlet ends of the filtering components are connected with liquid outlet pipes; the liquid inlet pipe is connected with a backwashing pipe, and one end, far away from the liquid inlet pipe, of the backwashing pipe penetrates through the shell and extends out of the shell; a first water pump is mounted on the backwashing pipe, a first switch valve is mounted at the joint of each liquid inlet pipe and the backwashing pipe, and the first switch valves are used for controlling opening and closing of the liquid inlet pipes or the backwashing pipe; a second water pump is mounted at the liquid inlet end of the water outlet valve, and a first three-way valve is mounted at the liquid inlet end of the second water pump; according to the ultra-pure water purifier, the problem that the water production efficiency and the user experience are influenced as the continuity of water production cannot be realized when the filter column arranged in the ultra-pure water purifier needs to be cleaned or replaced in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, in particular to a small ultrapure water machine. Background Art

[0002] Ultrapure water machines use pretreatment, reverse osmosis technology, column filtration, and post-treatment to almost completely remove conductive media from water while also reducing undissociated colloids, gases, and organic matter to very low levels. Ultrapure water machines are also known as ultrapure water devices, ultrapure water equipment, ultrapure water meters, ultrapure water systems, and laboratory ultrapure water devices.

[0003] The water outlets of existing ultrapure water machines are all fixed. When purified water needs to flow into a container that is too high, the container that is too high can easily touch the water outlet. In order to solve the problems existing in the prior art, the utility model with publication number CN221153798U discloses an ultrapure water machine (hereinafter referred to as prior art 1), comprising an ultrapure water machine body and a first controller fixedly mounted on the upper surface of the ultrapure water machine body, the interior of the ultrapure water machine body is provided with a groove, a holding platform is provided on the bottom wall of the groove, the upper surface of the holding platform is provided with a fixing component, and a collection structure for collecting water is provided on the holding platform; the collection structure comprises a storage tank and a water storage tank provided inside the holding platform, a drainage hole connected to the water storage tank is provided in the storage tank, and a sealing cover for sealing the water storage tank is detachably mounted on the outside of the holding platform; the fixing component comprises a mounting seat fixedly mounted on the upper surface of the holding platform, and the internal thread of the mounting seat is connected with a screw.

[0004] The fixing assembly provided in the prior art 1 can clamp and fix the vessel so that it remains stable when it is raised or lowered or filled with water; however, the ultrapure machine in the prior art 1 cannot achieve continuous water production when the filter column provided in the ultrapure machine needs to be cleaned or replaced, thereby affecting the water production efficiency and user experience. Utility Model Content

[0005] The purpose of the present utility model is to provide a small ultrapure water machine, which, during actual use, can solve the problem in the prior art that when the filter column arranged in the ultrapure water machine needs to be cleaned or replaced, the continuity of water production cannot be achieved, thereby affecting the water production efficiency and user experience.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A small ultrapure water machine comprises a housing and a water outlet valve mounted on the housing, and also comprises two filter assemblies of identical structure, wherein the liquid inlet ends of the filter assemblies are connected to a liquid inlet pipe, and the liquid outlet ends of the filter assemblies are connected to a liquid outlet pipe;

[0008] The liquid inlet pipe is connected to a backwash pipe, and one end of the backwash pipe away from the liquid inlet pipe extends through the housing to the outside of the housing; a first water pump is installed on the backwash pipe, and a first switch valve is installed at the connection between each liquid inlet pipe and the backwash pipe, and the first switch valve is used to control the opening and closing of the liquid inlet pipe or the backwash pipe. The filter assembly 103 is connected to a cleaning pipe 123, and a second switch valve is installed on the cleaning pipe 123;

[0009] A second water pump is installed at the liquid inlet end of the water outlet valve, a first three-way valve is installed at the liquid inlet end of the second water pump, and the liquid outlet pipe of the filter assembly is connected to the water outlet valve through the first three-way valve.

[0010] Preferably, a water storage barrel is provided in the outer shell, a second three-way valve is installed on the water storage barrel, the liquid outlet pipe of the filter assembly is connected to the water storage barrel through the second three-way valve, the liquid outlet end of the water storage barrel is connected to a delivery pipe, and the delivery pipe is connected to the liquid inlet end of the second water pump.

[0011] Preferably, a liquid level detector is installed on the water storage barrel.

[0012] Preferably, the filtration component includes a pretreatment component and an ultrafiltration component connected in sequence, the liquid inlet pipe is connected to the liquid inlet end of the pretreatment component, the liquid outlet pipe of the ultrafiltration component is connected to the liquid inlet end of the first three-way valve, and the cleaning pipe is connected to the pretreatment component.

[0013] Preferably, the pretreatment component includes a first shell and a first filter element, the first filter element is detachably installed in the first shell, and a first liquid cavity is formed between the first shell and the first filter element; the ultrafiltration component includes a second shell and a second filter element detachably installed in the second shell, a second liquid cavity is formed between the second shell and the second filter element, and an infusion tube is connected between the second filter element and the first liquid cavity; the liquid inlet pipe and the cleaning pipe 123 are both connected to the first shell.

[0014] Preferably, a filter plate may be installed in the liquid inlet pipe.

[0015] Preferably, a door is hinged on the shell.

[0016] Preferably, a flow guide pipe is installed on the water outlet valve.

[0017] Preferably, a telescopic tube is installed at the liquid outlet end of the flow guide tube.

[0018] Preferably, the telescopic tube is detachably connected to the flow guide tube.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the present invention, the first on-off valve is used to control the opening or closing of the liquid inlet pipe and the backwash pipe connected to the filter assembly; the first three-way valve is used to control the opening or closing of the liquid outlet pipe on the filter assembly; the second on-off valve is used to control the opening or closing of the cleaning pipe, and the end of the cleaning pipe away from the filter assembly is used to be connected to the cleaning liquid source;

[0021] When the filter assembly needs to be opened to filter the liquid to be purified, the first switch valve and the first three-way valve can be adjusted to open the liquid inlet pipe and the liquid outlet pipe connected to the filter assembly, and the backwash pipe connected to the liquid inlet pipe is closed. The second switch valve can be used to control the closure of the cleaning pipe. At this time, under the action of the second water pump, the liquid can be purified by the filter assembly and then discharged from the water outlet valve to realize water supply;

[0022] When it is necessary to backwash one of the filter components to ensure the filtering effect and filtering efficiency of the filter component; first, the liquid outlet pipe connected to the filter component to be cleaned is closed by adjusting the first three-way valve, and then the first switch valve connected to the filter component to be cleaned is adjusted to close the liquid inlet pipe connected to the filter component to be cleaned and the backwash pipe connected to the liquid inlet pipe is opened. Then, after opening the cleaning pipe by adjusting the second switch valve, the cleaning liquid input into the filter component through the cleaning pipe under the action of the first water pump connected to the backwash pipe can backwash the filter component to be cleaned, and the waste water generated by the flushing is discharged through the backwash pipe; when the filter component to be cleaned is backwashed under the action of the first water pump, the other filter component can still be continuously supplied with water under the action of the second water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a three-dimensional diagram of the present utility model.

[0025] Figure 2 This is a structural diagram of Example 1 of the present utility model.

[0026] Figure 3 This is a structural diagram of the second embodiment of the present utility model.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 101-housing, 102-outlet valve, 103-filter assembly, 104-liquid inlet pipe, 105-liquid outlet pipe, 106-first water pump, 107-first switch valve, 108-second water pump, 109-first three-way valve, 110-water storage tank, 111-second three-way valve, 112-delivery pipe, 113-pretreatment assembly, 114-ultrafiltration assembly, 115-first housing, 116-first filter element, 117-liquid delivery pipe, 118-door, 119-diversion pipe, 120-telescopic pipe, 121-second housing, 122-second filter element, 123-cleaning pipe, 124-backwash pipe. DETAILED DESCRIPTION

[0029] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0030] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0033] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] See Figure 1-Figure 2 This embodiment discloses a filtering device, specifically a small ultrapure water machine, including a housing 101 and a water outlet valve 102 mounted on the housing 101, and also includes two filter assemblies 103 of identical structure, wherein the liquid inlet ends of the filter assemblies 103 are connected to a liquid inlet pipe 104, and the liquid outlet ends of the filter assemblies 103 are connected to a liquid outlet pipe 105;

[0038] The liquid inlet pipe 104 is connected to a backwash pipe 124, and one end of the backwash pipe 124 away from the liquid inlet pipe 104 passes through the housing 101 and extends outside the housing 101; a first water pump 106 is installed on the backwash pipe 124, and a first switch valve 107 is installed at the connection between each liquid inlet pipe 104 and the backwash pipe 124. The first switch valve 107 is used to control the opening and closing of the liquid inlet pipe 104 or the backwash pipe 124. The filter assembly is connected to a cleaning pipe, and a second switch valve is installed on the cleaning pipe;

[0039] A second water pump 108 is installed at the liquid inlet end of the water outlet valve 102 , and a first three-way valve 109 is installed at the liquid inlet end of the second water pump 108 . The liquid outlet pipe 105 of the filter assembly 103 is connected to the water outlet valve 102 through the first three-way valve 109 .

[0040] In this embodiment, the second switch valve is used to control the opening or closing of the cleaning pipe, and the end of the cleaning pipe away from the filter assembly is used to be connected to the cleaning liquid source; the first switch valve 107 is used to control the opening or closing of the liquid inlet pipe 104 and the backwash pipe 124 connected to the filter assembly 103; the first three-way valve 109 is used to control the opening or closing of the liquid outlet pipe 105 on the filter assembly 103; when it is necessary to open the filter assembly 103 to filter the liquid to be purified, the first switch valve 107 and the first three-way valve 109 can be adjusted to open the liquid inlet pipe 104 and the liquid outlet pipe 105 connected to the filter assembly 103, and the backwash pipe 124 connected to the liquid inlet pipe 104 is closed, and the cleaning pipe 123 can be closed by the second switch valve; at this time, under the action of the second water pump 108, the liquid can be purified by the filter assembly 103 and then discharged from the water outlet valve 102 to realize water supply; in this embodiment, two filter assemblies 103 are used for alternating filtration, and when one filter assembly 103 is filtering, the other filter assembly 103 is filtering. Backwashing is performed to ensure continuous water supply; when one of the filter components 103 needs to be backwashed to ensure the filtering effect and filtering efficiency of the filter component 103; first, the liquid outlet pipe 105 connected to the filter component 103 to be cleaned is closed by adjusting the first three-way valve 109, and then the first switch valve 107 connected to the filter component 103 to be cleaned is adjusted to close the liquid inlet pipe 104 connected to the filter component 103 to be cleaned and open the backwashing pipe 124 connected to the liquid inlet pipe 104, and then After adjusting the second switch valve to open the cleaning pipe 123, the cleaning liquid input into the filter component 103 through the cleaning pipe 123 under the action of the first water pump 106 connected to the backwash pipe 124 can backwash the filter component 103 to be cleaned, and the wastewater generated by the flushing is discharged through the backwash pipe 124; when the filter component 103 to be cleaned is backwashed under the action of the first water pump 106, the other filter component 103 can still be continuously supplied with water under the action of the second water pump 108, ensuring water production efficiency and user experience.

[0041] In some embodiments, the filter assembly 103 includes a pretreatment assembly 113 and an ultrafiltration assembly 114 connected in sequence, the liquid inlet pipe 104 is connected to the liquid inlet end of the pretreatment assembly 113, the liquid outlet pipe 105 of the ultrafiltration assembly 114 is connected to the liquid inlet end of the first three-way valve 109, and the cleaning pipe 123 is connected to the pretreatment assembly 113. The pretreatment assembly 113 is used to remove large particle impurities, large molecular organic matter, residual chlorine and odor in the liquid to be purified. After being processed by the pretreatment assembly 113, the liquid to be purified enters the ultrafiltration assembly 114 connected to the pretreatment assembly 113. The ultrafiltration assembly 114 is used to intercept solutes dissolved in the water, thereby achieving deep treatment of the water quality and ensuring the purity of the output water quality; during the backwashing process of the filter assembly 103, the cleaning pipe 123 is opened to input cleaning liquid into the pretreatment assembly 113 to achieve backwashing of the pretreatment assembly 113.

[0042] In some embodiments, the pretreatment component 113 includes a first shell 115 and a first filter element 116, the first filter element 116 is detachably installed in the first shell 115, and a first liquid cavity is formed between the first shell 115 and the first filter element 116; the ultrafiltration component 114 includes a second shell 121 and a second filter element 122 detachably installed in the second shell 121, a second liquid cavity is formed between the second shell 121 and the second filter element 122, and an infusion tube 117 is connected between the second filter element 122 and the first liquid cavity; the liquid inlet pipe 104 and the cleaning pipe 123 are both connected to the first shell 115. After the liquid to be purified enters the first filter element 116 through the liquid inlet pipe 104, the first filter element 116 can remove large particles of impurities, large molecular organic matter, residual chlorine and odor in the liquid to be purified. The water filtered by the first filter element 116 enters the first liquid cavity and then enters the second filter element 122 through the liquid infusion pipe 117 under the action of the second water pump 108. The second filter element 122 intercepts the solutes dissolved in the water and the pure water obtained enters the second liquid cavity and passes through the liquid outlet pipe 105 and the first three-way valve 109 in sequence under the action of the second water pump 108 and is discharged from the water outlet valve 102; in this embodiment, the first filter element 116 is detachably connected to the first shell 115 by bolts, and the second filter element 122 is detachably connected to the second shell 121 by bolts; when the first filter element 116 is backwashed, the first three-way valve 109 is adjusted to reliably connect the liquid outlet pipe connected to the first shell 115 to be cleaned. 105 is closed, and then by adjusting the first on-off valve 107 connected to the first housing 115 to be cleaned, the liquid inlet pipe 104 connected to the first housing 115 to be cleaned is closed and the backwash pipe 124 connected to the liquid inlet pipe 104 is opened. Then, after the cleaning pipe 123 is opened by adjusting the second on-off valve, the cleaning liquid input into the first liquid chamber through the cleaning pipe 123 under the action of the first water pump 106 connected to the backwash pipe 124 can backwash the filter assembly 103 to be cleaned. After the cleaning liquid enters the first liquid chamber and enters the first filter element 116 under the action of the first water pump 106, it can cause large particles of impurities and macromolecular organic matter attached to the inner wall of the first filter element 116 to fall off from the first filter element 116, and the wastewater generated by the flushing is discharged through the backwash pipe 124. The second filter element 122 has a higher filtration accuracy and a poorer backwashing effect. When the second filter element 122 is blocked, it can be directly replaced to ensure the filtration effect. In some embodiments, a filter plate can be installed in the liquid inlet pipe 104.By providing the filter plate, it is possible to facilitate preliminary filtration of larger impurities and particulate matter in the liquid to be purified entering the liquid inlet pipe 104, thereby reducing the subsequent filtering burden of the first filter element 116 and the second filter element 122. The liquid inlet end of the inlet pipe in this embodiment is used to be detachably connected to the liquid source by bolts, and the filter plate is threadedly connected to the liquid inlet end of the liquid inlet pipe 104, thereby facilitating cleaning and replacement of the filter plate.

[0043] In some embodiments, a door 118 is hingedly connected to the housing 101. The door 118 facilitates inspection and replacement of components installed in the housing 101.

[0044] In some embodiments, a guide pipe 119 is installed on the water outlet valve 102. The guide pipe 119 can guide the purified water, making it more convenient for users to take water and ensuring stable water injection.

[0045] In some embodiments, a telescopic tube 120 is installed at the liquid outlet end of the guide tube 119. By providing the telescopic tube 120, the height of the water outlet can be adjusted according to actual needs to avoid the problem of water splashing due to the container being too high touching the water outlet or the container being too low.

[0046] In some embodiments, the telescopic tube 120 is detachably connected to the flow guide tube 119. The telescopic tube 120 is threadedly connected to the flow guide tube 119 to facilitate cleaning and replacement of the telescopic tube 120.

[0047] In some embodiments, a first control device for controlling the opening and closing of the first three-way valve 109, the first on-off valve 107, and the second on-off valve is installed within the housing 101. Each of the first three-way valve 109, the first on-off valve 107, and the second on-off valve is equipped with a first controller, which is electrically connected to the first control device. The first control device, through the first controller, can control the opening or closing of the first three-way valve 109, the first on-off valve 107, and the second on-off valve as needed. In this embodiment, the first controller and the first control device are conventional control devices in the prior art, and their structures, connections, and functions are not further elaborated herein.

[0048] Example 2

[0049] See Figure 3This embodiment is a further optimization of the first embodiment; a water storage barrel 110 is provided in the housing 101, and a second three-way valve 111 is installed on the water storage barrel 110. The liquid outlet pipe 105 of the filter assembly 103 is connected to the water storage barrel 110 through the second three-way valve 111. The liquid outlet end of the water storage barrel 110 is connected to a delivery pipe 112, and the delivery pipe 112 is connected to the liquid inlet end of the second water pump 108. In this embodiment, the end of the cleaning pipe 123 away from the first shell 115 is connected to the water storage barrel 110. After the second water pump 108 is started, the liquid purified by the filter assembly 103 first enters the water storage barrel 110 for storage and then passes through the delivery pipe 112 and the second water pump 108 in sequence and is discharged from the drain valve; the second three-way valve 111 is used to control the opening or closing of the two liquid inlet pipes 104 to ensure that when any filter assembly 103 is filtering and making water, the other filter assembly 103 is backwashing to ensure the filtration efficiency and filtered water quality. By setting the The water storage barrel 110 can further ensure the continuity of water production; during the backwashing process, after the second switch valve controls the cleaning pipe 123 to open, under the action of the first water pump 106, part of the liquid in the water storage barrel 110 is input into the first filter element 116 to backwash the first filter element 116 from the outside to the inside, so that impurities attached to the inner wall of the first filter element 116 can be discharged through the backwashing pipe 124. The flow rate of the cleaning pipe 123 is less than the flow rate of the liquid outlet pipe 105, thereby avoiding the liquid input into the first shell 115 during the backwashing process affecting the continuous water output.

[0050] In some embodiments, a liquid level detector is installed on the water storage tank 110. The liquid level detector is used to detect the water level in the water storage tank 110. When the liquid level in the water storage tank 110 is too low, the liquid level detector will issue an alarm to the user. The liquid level detector in this embodiment is a conventional detection and alarm device in the prior art, and its structure and function will not be elaborated here.

[0051] In some embodiments, a second control device for controlling the opening and closing of the second three-way valve 111, the first on-off valve 107, and the second on-off valve is installed within the housing 101. A second controller is installed on each of the second three-way valve 111, the first on-off valve 107, and the second on-off valve. The second controller is electrically connected to the second control device. The second control device, through the second controller, can control the opening or closing of the second three-way valve 111, the first on-off valve 107, and the second on-off valve as needed. In this embodiment, the second controller and the second control device are conventional control devices in the prior art, and their structures, connections, and functions are not further elaborated herein.

[0052] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A small ultrapure water machine, comprising a housing (101) and a water outlet valve (102) mounted on the housing (101), characterized in that: It also includes two filter assemblies (103) with the same structure, wherein the liquid inlet ends of the filter assemblies (103) are connected to the liquid inlet pipe (104), and the liquid outlet ends of the filter assemblies (103) are connected to the liquid outlet pipe (105); The liquid inlet pipe (104) is connected to a backwash pipe (124), and one end of the backwash pipe (124) away from the liquid inlet pipe (104) passes through the housing (101) and extends to the outside of the housing (101); a first water pump (106) is installed on the backwash pipe (124); a first switch valve (107) is installed at the connection between each liquid inlet pipe (104) and the backwash pipe (124), and the first switch valve (107) is used to control the opening and closing of the liquid inlet pipe (104) or the backwash pipe (124); a cleaning pipe (123) is connected to the filter assembly (103), and a second switch valve is installed on the cleaning pipe (123); A second water pump (108) is installed at the liquid inlet end of the water outlet valve (102), a first three-way valve (109) is installed at the liquid inlet end of the second water pump (108), and the liquid outlet pipe (105) of the filter assembly (103) is connected to the water outlet valve (102) via the first three-way valve (109).

2. A small ultrapure water machine according to claim 1, characterized in that: A water storage barrel (110) is provided in the housing (101), and a second three-way valve (111) is installed on the water storage barrel (110). The liquid outlet pipe (105) of the filter assembly (103) is connected to the water storage barrel (110) via the second three-way valve (111). The liquid outlet end of the water storage barrel (110) is connected to a delivery pipe (112), and the delivery pipe (112) is connected to the liquid inlet end of the second water pump (108).

3. A small ultrapure water machine according to claim 2, characterized in that: A liquid level detector is installed on the water storage barrel (110).

4. A small ultrapure water machine according to claim 1, characterized in that: The filtration component (103) includes a pretreatment component (113) and an ultrafiltration component (114) connected in sequence, the liquid inlet pipe (104) is connected to the liquid inlet end of the pretreatment component (113), the liquid outlet pipe (105) of the ultrafiltration component (114) is connected to the liquid inlet end of the first three-way valve (109), and the cleaning pipe (123) is connected to the pretreatment component (113).

5. A small ultrapure water machine according to claim 4, characterized in that: The pretreatment component (113) includes a first housing (115) and a first filter element (116), wherein the first filter element (116) is detachably mounted in the first housing (115), and a first liquid cavity is formed between the first housing (115) and the first filter element (116); the ultrafiltration component (114) includes a second housing (121) and a second filter element (122) detachably mounted in the second housing (121), and a second liquid cavity is formed between the second housing (121) and the second filter element (122), and a liquid infusion tube (117) is connected between the second filter element (122) and the first liquid cavity; the liquid inlet tube (104) and the cleaning tube (123) are both connected to the first housing (115).

6. A small ultrapure water machine according to claim 1, characterized in that: A filter plate may be installed in the liquid inlet pipe (104).

7. A small ultrapure water machine according to claim 1, characterized in that: A door (118) is hingedly connected to the housing (101).

8. The small ultrapure water machine according to claim 1, characterized in that: A flow guide pipe (119) is installed on the water outlet valve (102).

9. A small ultrapure water machine according to claim 8, characterized in that: A telescopic tube (120) is installed at the liquid outlet end of the flow guide tube (119).

10. A small ultrapure water machine according to claim 9, characterized in that: The telescopic tube (120) is detachably connected to the flow guide tube (119).

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