CN210419582U

CN210419582U - Desk type water purifier

Info

Publication number: CN210419582U
Application number: CN201920775119.4U
Authority: CN
Inventors: 贺素平
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-04-28
Anticipated expiration: 2029-05-27

Abstract

The utility model provides a desk-top purifier, include: the filter device is provided with a purified water outlet which is communicated with a purified water pipeline; the flow control valve is arranged on the purified water pipeline and used for controlling the flow of the purified water; a heating device disposed on the purified water pipe downstream of the flow control valve; and the control device is electrically connected to the flow control valve and is used for controlling the flow control valve to adjust the purified water flow according to the set temperature so as to reduce the purified water flow when the set temperature is increased. The utility model provides an even this scheme is when the user settlement temperature is higher, also can be with temperature rapid heating to the settlement temperature to can accurate control water purification flow through flow control valve, and then accurately control water purification temperature. Like this, need not to install powerful heating device in desk-top purifier to reduce desk-top purifier's cost, and provide probably for desk-top purifier reduces the volume.

Description

Desk type water purifier

Technical Field

The utility model relates to a technical field of aqueous cleaning specifically, relates to a desk-top purifier.

Background

With the increasing demand of people for water quality, water purifiers have become essential living goods basically. Various manufacturers have proposed various water purifiers to suit different application places. Desktop water purifiers are popular as an installation-free water purifier.

Desk-top purifier need not to be connected to water supply pipeline, is equipped with former water tank in the desk-top purifier, and water pump in with former water tank through the booster pump sends filter equipment to carry out purification treatment and obtains the clean water storage in the water purification case, gives the user through the water purification pump in with the water purification case when using for the user. Desktop water purifiers are often provided with an instant electric heater to the user can set different water temperatures to meet different needs.

The current desktop water purifier controls the power of an instant electric heater to control the heating temperature. However, when the water temperature set by the user is high, the water flowing through the instantaneous electric heater may not be heated to the set temperature quickly, and thus the water temperature may not meet the user's demand. In order to meet the requirement of the highest water temperature, a high-power instant electric heater is usually selected and installed on a pipeline, so that the cost of the desktop water purifier is high. And a high-power instant electric heater occupies a large volume.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that exists among the prior art at least partially, the utility model provides a desk-top purifier includes: the filter device is provided with a purified water outlet which is communicated with a purified water pipeline; the flow control valve is arranged on the purified water pipeline and used for controlling the flow of the purified water; a heating device disposed on the purified water pipe downstream of the flow control valve; and the control device is electrically connected to the flow control valve and is used for controlling the flow control valve to adjust the purified water flow according to the set temperature so as to reduce the purified water flow when the set temperature is increased. The utility model provides an even this scheme is when the user sets for the temperature higher, also can be with temperature rapid heating to the settlement temperature. Like this, need not to install powerful heating device in desk-top purifier and satisfy the requirement of high temperature to desk-top purifier's cost has been reduced, and for desk-top purifier reduce the volume provide probably. In addition, the flow control valve can control the flow of the purified water relatively accurately, and further can control the temperature of the purified water relatively accurately to reach the temperature set by a user.

Illustratively, the filtering device further has a waste water outlet, the waste water outlet is communicated with a waste water pipeline, and the desktop water purifier further comprises: a waste water regulating valve disposed on the waste water pipeline for controlling a flow rate of waste water, wherein the control device is electrically connected to the waste water regulating valve for regulating the flow rate of waste water according to the set temperature to increase the flow rate of waste water when the set temperature is increased. Waste water flow can be accurately controlled through the waste water regulating valve, and then stable work of the desktop water purifier is ensured.

The water purifier also comprises a temperature sensor which is arranged on the purified water pipeline and is positioned at the downstream of the heating device, the temperature sensor is electrically connected to the control device, and the control device also controls the flow control valve and the waste water regulating valve to regulate the purified water flow rate and the waste water flow rate according to the water temperature detected by the temperature sensor. In this way, the flow rate of purified water and the flow rate of waste water can be more accurately controlled, so that the temperature of the obtained hot water can be more accurately controlled.

Illustratively, the system further comprises a raw water tank and a waste water tank, and the waste water pipeline is communicated to the waste water tank. The raw water is separated from the waste water, so that the service life of the filtering device can be prolonged.

Exemplarily, the method further comprises the following steps: the return pipeline is provided with a first end and a second end which are oppositely arranged, the first end is communicated to the waste water pipeline, and the second end is communicated to the raw water tank; and a return valve located on the return line, wherein the return valve is electrically connected to the control device, and the control device controls the return valve to be opened when the set temperature reaches a preset threshold value. Therefore, when the flow of the generated wastewater is large due to high temperature set by a user, at least one part of the wastewater can be recycled to the raw water tank for recycling, so as to save water.

Illustratively, the first end is in communication with the waste tank. After the return valve opened, waste water got into former water tank and waste water tank simultaneously to retrieve partly waste water and recycle, it is too fast to avoid the quality of water decline in the former water tank, avoid producing too big influence to filter equipment's life.

Exemplarily, the waste water treatment device comprises a tank body, wherein a barrier is arranged in the tank body and used for separating the tank body into the raw water tank and the waste water tank, and the top of the barrier is lower than the top of the tank body wall of the tank body. Like this, after the waste water tank water is full, can cross the separation piece and flow in raw water tank, avoid the water in the waste water tank to overflow.

The water heater further comprises a cold water pipeline, wherein one end of the cold water pipeline is communicated between the flow control valve and the heating device, so that a user can conveniently obtain water with a desired temperature according to needs.

The sterilizing device is arranged on the cold water pipeline and/or the purified water pipeline and is used for sterilizing the purified water flowing through the sterilizing device so as to improve the water quality.

Illustratively, the device further comprises a pre-filter device arranged upstream of the filter device. The raw water is primarily filtered by the pre-filter before entering the filter, so that the service life of the filter can be prolonged.

Illustratively, the filtration device is a high flux reverse osmosis membrane filtration device. After the large-flux reverse osmosis membrane filtering device is adopted, a user can take water along with the water, so that the freshness of the pure water quality can be guaranteed. In addition, because the pure water tank and the water pump are not needed to be reused, the secondary pollution of the intermediate link to the pure water is reduced, and the noise exists only when water is taken. In addition, because the pure water tank and the water suction pump are eliminated, the possibility of reducing the volume of the desktop water purifier is provided, and the cost is saved.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

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

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a water path diagram of a desktop water purifier according to an exemplary embodiment of the present invention;

fig. 2 is a water path diagram of a desktop water purifier according to another exemplary embodiment of the present invention; and

fig. 3 is an internal structural view according to an exemplary embodiment of the present invention.

Wherein the figures include the following reference numerals:

100. a desktop water purifier; 110. a water tank; 110A, a raw water tank; 110B, a waste water tank; 120. a booster pump; 130. a pre-filter device; 140. a filtration device; 150. a water purification pipeline; 160. a flow control valve; 170. a heating device; 180. a waste water line; 190. a waste water regulating valve; 200. a desktop water purifier; 210. a return line; 220. a reflux valve; 230. a cold water line; 240. a sterilizing device; 310. a water intake.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description illustrates only a preferred embodiment of the invention and that the invention may be practiced without one or more of these details. In addition, some technical features that are well known in the art are not described in detail in order to avoid obscuring the present invention.

The utility model provides a desk-top purifier. This desk-top purifier can exempt from the installation, and the electricity of plugging can use.

As shown in fig. 1 to 3, the water tank 110 of the desktop water purifier 100 is used to contain raw water to be filtered, such as tap water. Alternatively, the waste water produced during the water production process may be returned to the water tank 110. The booster pump 120 pumps the water in the water tank 110 to the filtering apparatus 140. The filter device 140 has a water inlet and a clean water outlet. The water inlet of the filter device 140 is communicated to the booster pump 120. The filter device 140 filters the raw water supplied from the booster pump 120.

The filtration device 140 may be a high flux reverse osmosis membrane formed filtration device. The membrane pore size of the reverse osmosis membrane is very small, even reaching the nanometer level, so that dissolved salts, colloids, microorganisms, organic matters and the like in water can be effectively removed, and thus, the purified water produced by filtering is generally called pure water. The high flux reverse osmosis membrane is a reverse osmosis membrane with water production of 300G or more per day. Wherein 1G is approximately equal to 3.785 liters. Taking 200mL of a cup of water as an example, the time for preparing a cup of water by using a 300G reverse osmosis membrane is about 15 seconds. After the large-flux reverse osmosis membrane filtering device is adopted, a user can take water along with the water, so that the freshness of the pure water quality can be guaranteed. In addition, because the pure water tank and the water pump are not needed to be reused, the secondary pollution of the intermediate link to the pure water is reduced, and the noise exists only when water is taken. In addition, because the pure water tank and the water suction pump are eliminated, the possibility of reducing the volume of the desktop water purifier is provided, and the cost is saved. Large flux reverse osmosis membrane filtration devices are well known in the art and are not modified and will not be described in detail. Of course, the filtering device 140 may be other filtering devices, such as an ultrafiltration membrane filtering device, etc., as long as it can filter raw water and obtain purified water with a quality meeting the requirement of the user on the water quality.

The clean water outlet of the filter 140 is connected to a clean water line 150. A flow control valve 160 is provided on the fresh water line 150 for controlling the flow of the fresh water. The flow control valve 160 may be any of various types of flow control valves known in the art. When the temperature of water set by the user is high, the flow control valve 160 allows a small flow of purified water to pass therethrough so that the water can be rapidly heated to the set temperature. When the water temperature set by the user is low, the flow control valve 160 allows a large flow of purified water to pass therethrough, so that a desired amount of water can be quickly obtained.

The heating device 170 is downstream of the flow control valve 160. A heating device 170 is provided on the purified water pipe 150 for heating the purified water flowing through the heating device 170. The heating device 170 may be an instantaneous electric heater. The heating element of the instant heating type electric heater is completely isolated from the water path, and the temperature of water is gradually increased in the flowing process of the water in the pipeline, so that the instant heating type electric heater has the advantage of high heating speed. The user can set the temperature to obtain water at a desired temperature. The set temperature may be any temperature in the range of normal temperature to 100 degrees. Alternatively, several set temperatures, for example, 25 degrees, 50 degrees, 75 degrees, and 100 degrees, may be provided on the operation panel of the desktop water purifier, and the user can only select among the provided set temperatures. Alternatively, the power of the heating device 170 may be constant. Alternatively, the power of the heating device 170 may be varied according to a set temperature. For example, when the water temperature set by the user is high, the power of the heating device 170 can be set to be high so as to reach the temperature requirement set by the user.

A control device (not shown) is electrically connected to flow control valve 160. The control means is used to control the flow control valve 160 according to the set temperature to adjust the flow rate of the purified water passing through the heating means 170. The control means controls the flow control valve 160 to decrease the flow rate of the purified water when the set temperature is increased. For example, for a reverse osmosis membrane of 400G, when the temperature is set to 100 ℃ by the user, the flow rate of the purified water can be controlled within the range of 350-500L/min by the flow control valve 160. When the temperature is set to 25 ℃, the flow control valve 160 can control the flow of purified water within the range of 600-700L/min. When the temperature set by the user is close to the normal temperature, the flow rate of the purified water can be controlled to be close to the water making capacity of the filtering device 140. For a filter device formed by the reverse osmosis membrane, reverse osmosis membranes with different specifications have different membrane fluxes, the membrane fluxes reflect the water production capacity of the filter device, and the larger the membrane flux is, the larger the water production capacity is. For example, a reverse osmosis membrane of 400G has a membrane flux of about 1.3 times that of a reverse osmosis membrane of 300G. Therefore, when the set temperature is the same, the net water flow can be controlled in different ranges for the filtering devices with different membrane fluxes. In addition, the flow rate of the purified water at different set temperatures is also related to the heating power of the heating device 170.

Since the flow rate of the purified water is reduced by the flow control valve 160 when the set temperature is increased, so that the flow rate of the water flowing through the heating device 170 is reduced, the temperature of the water can be heated to the set temperature when the purified water flows through the heating device 170. Thus, a high-power heating device 170 does not need to be installed in the desktop water purifier 100 to meet the requirement of high water temperature, so that the cost of the desktop water purifier is reduced, and the volume of the desktop water purifier is reduced. In addition, the flow control valve 160 can control the flow of purified water relatively accurately, so that the temperature of purified water can be controlled relatively accurately to reach the temperature set by the user.

In the case of a reverse osmosis membrane filtration unit that produces pure water and also produces wastewater in a certain proportion, in this embodiment, the filtration unit 140 also has a wastewater outlet that communicates with a wastewater line 180. The other end of the waste water pipeline 180 may be connected to the water tank 110, the waste water and the raw water are mixed and then filtered by the filtering device 140, and the above-mentioned operation is repeated until the water quality in the water tank 110 is lower than the requirement of the filtering device 140 for the water quality, so as to remind the user to replace the water in the water tank 110.

Recycling the waste water saves water, but shortens the life of the filter apparatus 140. In case that the life span of the filtering device 140 needs to be considered, the waste water may be placed separately from the raw water. In this case, the desktop water purifier 100 may include a raw water tank 110A and a waste water tank 110B. The raw water tank 110A communicates with the water inlet of the booster pump 120. Waste tank 110B communicates with waste line 180. In this way, the wastewater generated by the filtering device 140 may be collected in the wastewater tank 110B via the wastewater line 180.

As described above, when the set temperature is high, the flow control valve 160 controls the flow rate of the clean water to be decreased, but since the rotation speed of the booster pump 120 is not limited by the flow rate of the generated clean water, the flow rate of the generated waste water is increased. The waste water pipeline 180 is provided with a waste water regulating valve 190 for controlling the flow of waste water. The control means is electrically connected to the waste water regulating valve 190 for regulating the flow of waste water according to a set temperature to increase the flow of waste water when the temperature of water rises. The waste water control valve 190 may be any of various types of waste water control valves, such as "waste water ratio" and the like. The waste water ratio is actually a throttling device to control the waste water to be discharged according to a certain proportion. For example, for a reverse osmosis membrane of 400G, when the temperature is set to 100 ℃ by the user, the wastewater flow can be controlled within the range of 1650-2000L/min by the wastewater control valve 190. When the temperature is set to 25 ℃ by the user, the wastewater flow can be controlled within the range of 1300-1400L/min by the wastewater control valve 190.

The above-described control of the flow rate of the purified water and the flow rate of the wastewater by controlling the flow rate control valve 160 and the wastewater adjustment valve 190 according to the user-set temperature enables the water temperature to be adjusted substantially in conformity with the user-set temperature. However, since the heating speed of the heating device 170 is affected by the water flow speed and also relates to the ambient temperature, it is easier to heat to the set temperature in summer than in winter, for example. Therefore, in order to precisely adjust the temperature of the hot water obtained from the water intake 310 (shown in fig. 3), it is preferable that the desktop water purifier further includes a temperature sensor (not shown). A temperature sensor may be provided on the clean water line 150 downstream of the heating device 170, for example near the intake. The temperature sensor is used for detecting the water flow temperature of the water intake, particularly the temperature of hot water. The temperature sensor is electrically connected to the control device. Thus, the control unit may also control the flow control valve 160 and the waste water regulating valve 190 to adjust the flow rate of the purified water and the flow rate of the waste water according to the temperature of the water detected by the temperature sensor. For example, when the user-set temperature is 75 degrees, the control device first controls the flow control valve 160 and the waste water regulating valve 190 according to the user-set temperature. After the purified water flow rate and the waste water flow rate are adjusted, the temperature sensor detects that the water flow temperature of the water intake port 310 is lower than 75 ℃, and the control device further controls the flow control valve 160 and the waste water regulating valve 190 to reduce the purified water flow rate and increase the waste water flow rate until the water flow temperature of the water intake port 310 reaches 75 ℃. On the contrary, when the temperature sensor detects that the water temperature of the water intake port 310 is higher than 75 degrees, the control device further controls the flow control valve 160 and the waste water regulating valve 190 to increase the flow rate of the purified water and decrease the flow rate of the waste water until the water temperature of the water intake port 310 reaches 75 degrees. Thereby, an accurate adjustment of the water temperature taken at the intake 310 can be achieved.

Considering that the flow rate of the waste water generated when the temperature set by the user is high is large, and the quality of the waste water is relatively low, at least a part of the waste water can be recycled to the raw water tank 110A for recycling. Based on this, the present invention provides a desktop water purifier 200, as shown in fig. 2. The desktop water purifier 200 is substantially identical to the desktop water purifier 100, except that the desktop water purifier 200 includes a return line 210 and a return valve 220. The same reference numerals will be used in fig. 2 showing the desktop water purifier 200 for the same or similar parts as the desktop water purifier 100, and further details of these same or similar parts will not be provided.

The return line 210 has first and second ends disposed opposite one another. The first end is connected to the waste water pipe 180, and the second end is connected to the raw water tank 110A. A return valve 220 is located on return line 210. Return valve 220 is electrically connected to a control device. The control means controls the return valve 220 to open when the user-set temperature reaches a preset threshold. The preset threshold value can be selected according to the proportion of the waste water flow to the purified water flow at the water temperature set by a user. For example, the water temperature corresponding to the wastewater flow rate reaching two, three or four times the purified water flow rate may be set as the preset threshold. When the set temperature is higher than the preset threshold, the control device controls the return valve 220 to open.

In the illustrated embodiment, a first end of the return line 210 is connected between the waste tank 110B and the waste regulator valve 190. Equivalently, a first end of the return line 210 communicates with the waste tank 110B. After the return valve 220 is opened, the waste water enters the raw water tank 110A and the waste water tank 110B at the same time, so that a part of the waste water is recycled, the water quality in the raw water tank 110A is prevented from being reduced too fast, and the service life of the filtering device 140 is prevented from being greatly influenced.

Optionally, the first end of the return line 210 may also be connected between the waste water regulating valve 190 and the filtering device. Thus, it is possible to control whether the wastewater is completely recovered or partially recovered by controlling the wastewater adjustment valve 190 and the return valve 220. Further, by controlling the amount of water flow allowed through the waste water regulating valve 190 and the return valve 220, the ratio of entering the waste water tank 110B and returning to the raw water tank 110A can also be controlled.

After a period of use, the amount of water in the waste tank 110B is gradually increased and the amount of water in the raw water tank 110A is gradually decreased, so that the raw water tank 110A and the waste tank 110B may be formed by installing a blocking member 110C in the tank body 110 in order to prevent the water in the waste tank 110B from overflowing. The top of the barrier 110C is lower than the top of the wall of the tank 110 so that the waste tank 110B can flow into the raw water tank 110A over the barrier 110C when it is full.

Further, the desktop water purifier 200 further includes a cold water pipeline 230. One end of the cold water line 230 is communicated between the flow control valve 160 and the heating device 170. The other end of the cold water pipe 230 is connected to a water intake 310, as shown in fig. 3. One end of the clean-water line 150 downstream of the heater 170 is also connected to the intake 310. Intake port 310 may have cold and hot water outlets. Alternatively, the intake port 310 may have only one outlet, and both the cold water and the hot water flow out of the same outlet.

Referring back to fig. 2, the desktop water purifier 200 may further include a sterilization device 240, which may be disposed on the cold water line 230. In other embodiments, not shown, a sterilization device may also be provided on the clean water line 150. The sterilization device may be disposed upstream of the heating device 170, or may be disposed downstream of the heating device 170. Alternatively, a sterilization device may be provided on both the cold water line 230 and the clean water line 150. The sterilization device 240 is used to sterilize the purified water flowing through the sterilization device 240. The sterilization device 240 may be an Ultraviolet (UV) sterilization device.

The cold water line 230 and the sterilizer 240 may be attached to the desktop water purifier 100 shown in fig. 1.

Preferably, a pre-filter 130 is also provided before the filter 140, as shown in fig. 1-2. The pre-filter device 130 is disposed upstream of the filter device 140 for primary filtering of the water entering the filter device 140. The pre-filter device 130 may have therein a PP filter element, an activated carbon filter element, a carbon fiber filter element, or a composite filter element of a plurality of these elements. The PP filter element can effectively remove impurities such as suspended matters, particles, iron rust and the like in liquid. The active carbon filter element can effectively remove organic matters, residual chlorine and other radioactive substances in water. The carbon fiber filter element can effectively remove particles, residual chlorine and chemical substances (trichloromethane, tetrachloromethane and the like) in water. The booster pump 120 first pumps the raw water to the pre-filter device 130, and the water primarily filtered by the pre-filter device 130 is transferred to the filter device 140 for secondary filtration.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front", "rear", "upper", "lower", "left", "right", "horizontal", "vertical", "horizontal" and "top", "bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features shown in the figures to other components or features. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A desktop water purifier (100, 200), comprising:

a filter device (140) having a purified water outlet communicating with a purified water line (150);

a flow control valve (160) provided on the purified water pipe for controlling a flow rate of the purified water;

a heating device (170) disposed on the purified water line downstream of the flow control valve; and

and the control device is electrically connected to the flow control valve and is used for controlling the flow control valve to adjust the purified water flow according to the set temperature so as to reduce the purified water flow when the set temperature is increased.

2. The desktop water purifier (100, 200) according to claim 1, wherein said filtering device further has a waste water outlet, said waste water outlet being in communication with a waste water line (180), said desktop water purifier further comprising:

a waste water regulating valve (190) arranged on the waste water pipeline and used for controlling the flow of waste water,

wherein the control device is electrically connected to the waste water regulating valve for regulating the flow of waste water in accordance with the set temperature to increase the flow of waste water when the set temperature increases.

3. The desktop water purifier (100, 200) according to claim 2, further comprising a temperature sensor disposed on the purified water pipeline (150) and downstream of the heating device (170), the temperature sensor being electrically connected to the control device, the control device further controlling the flow control valve (160) and the waste water regulating valve (190) to adjust the purified water flow rate and the waste water flow rate according to the water temperature detected by the temperature sensor.

4. A desktop water purifier (100, 200) according to claim 2, further comprising a raw water tank (110A) and a waste water tank (110B), said waste water line (180) being connected to said waste water tank.

5. The desktop water purifier (200) according to claim 4, further comprising:

a return line (210) having a first end and a second end disposed opposite to each other, the first end being communicated to the waste water line (180), and the second end being communicated to the raw water tank (110A); and

a return valve (220) located on the return line (210),

wherein the return valve is electrically connected to the control device, which controls the return valve to be opened when the set temperature reaches a preset threshold value.

6. The desktop water purifier (200) according to claim 5, wherein said first end is in communication with said waste water tank (110B).

7. A desktop water purifier (100, 200) according to claim 4, comprising a tank (110) having a barrier (110C) arranged therein for separating the tank into the raw water tank (110A) and the waste water tank (110B), the barrier having a top lower than the top of the tank wall of the tank.

8. A desktop water purifier (100, 200) according to claim 1, further comprising a cold water line (230) having one end connected to between said flow control valve (160) and said heating means (170).

9. The desktop water purifier (100, 200) according to claim 8, further comprising a sterilizing device (240) disposed on the cold water line (230) and/or the purified water line (150) for sterilizing the purified water flowing through the sterilizing device.

10. A desktop water purifier (100, 200) according to claim 1, further comprising a pre-filter (130) arranged upstream of said filter (140).

11. A desktop water purifier (100, 200) according to claim 1, wherein said filtration device is a high flux reverse osmosis membrane filtration device.