CN115771976A - Water purification equipment and control method thereof - Google Patents
Water purification equipment and control method thereof Download PDFInfo
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- CN115771976A CN115771976A CN202211656386.2A CN202211656386A CN115771976A CN 115771976 A CN115771976 A CN 115771976A CN 202211656386 A CN202211656386 A CN 202211656386A CN 115771976 A CN115771976 A CN 115771976A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 306
- 238000000746 purification Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 130
- 239000008213 purified water Substances 0.000 claims abstract description 81
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000001914 filtration Methods 0.000 claims abstract description 40
- 239000002351 wastewater Substances 0.000 claims description 61
- 239000012528 membrane Substances 0.000 claims description 42
- 239000007787 solid Substances 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 12
- 238000001728 nano-filtration Methods 0.000 claims description 3
- 238000001223 reverse osmosis Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011045 prefiltration Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
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Abstract
The application relates to a water purification device and a control method thereof, the water purification device comprises: a main liquid supply path; a water purification branch; the control unit controls the heating device to be opened or closed according to the purified water flow of the purified water branch and the water temperature of the main liquid supply path. A control method of a water purifying apparatus, comprising: filtering water flow in the main liquid supply path, and outputting purified water by the purified water branch; detecting the purified water flow of the purified water branch; comparing the flow of the purified water with a preset flow value; when the flow of the purified water is smaller than the preset flow, the water temperature of the liquid supply main circuit is detected, and the heating device is started when the water temperature of the liquid supply main circuit is smaller than the preset temperature. The water purifying equipment and the control method thereof are beneficial to improving the water yield of purified water and prolonging the service life of the water purifying equipment.
Description
Technical Field
The application relates to the technical field of water purification, in particular to a water purification device and a control method thereof.
Background
Because the filter membrane device is influenced by water temperature, water quality and water yield, the water yield of the filter membrane device can be unstable under the conditions of different water qualities and different seasons, so that the water outlet flow of the water purifying equipment is unstable, the use of a user is seriously influenced, and the user experience is poor.
Disclosure of Invention
Accordingly, it is necessary to provide a water purification apparatus and a control method thereof, which can solve the problem of unstable water flow rate of the water purification apparatus.
A water purification apparatus comprising:
a liquid supply main path for inputting raw water;
the water purification branch is communicated with the liquid supply main path;
the filter membrane device is arranged between the main liquid supply path and the water purification branch path and is used for filtering;
the first detection device is arranged on the water purification branch and used for detecting the purified water flow of the water purification branch;
the second detection device is arranged on the main liquid supply path and is used for detecting the water temperature of the main liquid supply path;
the heating device is arranged in the liquid supply main circuit and is used for heating;
the control unit is electrically connected with the first detection device, the second detection device and the heating device; the control unit controls the heating device to be opened and closed according to the purified water flow of the purified water branch and the water temperature of the liquid supply main path.
Foretell water purification unit, the water purification flow of the water purification branch road that will gather and the temperature of confession liquid main road export to the control unit, the control unit according to the water purification flow of water purification branch road and the opening and close of the temperature control heating device of confession liquid main road for the play water flow of filter membrane device keeps invariable, does benefit to and improves water production rate of water purification, prolongs the life of filter membrane device simultaneously.
In one embodiment, the water purifying apparatus further comprises a first control valve, the first control valve is arranged at the water inlet end of the main liquid supply path, and the control unit controls the operation of the first control valve according to the purified water flow of the purified water branch path.
In one embodiment, the water purifying apparatus further comprises a pre-filtering device, and the pre-filtering device is disposed between the first control valve and the heating device and is used for pre-filtering raw water in the main liquid supply path.
In one embodiment, the pre-filtering device includes a plurality of filter elements, the filter elements are different in type, and each filter element is connected in series with the main liquid supply path, and the filter membrane device is a reverse osmosis filter membrane or a nanofiltration membrane.
In one embodiment, the water purification apparatus further includes a pressure regulating device, the pressure regulating device is disposed in the main liquid supply path and located upstream of the filter membrane device, and the control unit controls whether the pressure regulating device is pressurized or not according to the purified water flow of the purified water branch path and the water temperature of the main liquid supply path.
In one embodiment, the water purifying apparatus further includes a water quality detecting device, a second control valve and a waste water branch, the waste water branch is connected to the main liquid supply path and is not connected to the water purifying branch, the second control valve is disposed in the waste water branch, the water quality detecting device is disposed in the main liquid supply path and is configured to detect a total solid value of solubility of raw water in the main liquid supply path, and the control unit controls an opening degree of the second control valve according to the total solid value of solubility of raw water in the main liquid supply path.
In one embodiment, the water purifying apparatus further comprises a post-filtering device, and the post-filtering device is disposed on the water purifying branch and is used for filtering purified water of the water purifying branch.
A control method of a water purifying apparatus, comprising:
filtering water flow in the main liquid supply path, and outputting purified water by the purified water branch;
detecting the purified water flow of the purified water branch;
comparing the purified water flow with a preset flow value;
when the flow of the purified water is greater than a preset flow value, controlling a heating device to be closed; when the flow of the purified water is smaller than a preset flow value, the water temperature in the liquid supply main circuit is detected, and the heating device is started when the water temperature of the liquid supply main circuit is smaller than a preset temperature value.
The control method of the water purifying equipment is beneficial to improving the water yield of purified water and prolonging the service life of the water purifying equipment.
In one embodiment, the step of filtering the flow of water in the main liquid supply path further comprises, before the step of: and determining whether the water flow in the main liquid supply path is pressurized or not according to the purified water flow of the purified water branch path and the water temperature of the main liquid supply path.
In one embodiment, the method comprises the following steps:
when the flow of the purified water is larger than a preset flow value, controlling the water flow pressure in the main liquid supply path to be in a standard condition and turning off the heating device;
when the flow of the purified water is smaller than a preset flow value and the water temperature of the main liquid supply path is more than or equal to 25 ℃, controlling the water flow in the main liquid supply path to be in a pressurization condition and closing the heating device;
when the flow of the purified water is smaller than a preset flow value and the water temperature of the main liquid supply path is 15-25 ℃, controlling the water flow pressure in the main liquid supply path to be in a standard condition and starting the heating device;
when the flow of the purified water is smaller than a preset flow value and the water temperature of the main liquid supply path is less than or equal to 15 ℃, controlling the water flow in the main liquid supply path to be in a pressurization condition and starting the heating device.
In one embodiment, the step of filtering the water flow in the main liquid supply path further comprises the following steps: communicating a waste water branch with a liquid supply main path, and outputting waste water by the waste water branch; and detecting the total dissolved solid value of the raw water in the main liquid supply path, and adjusting the wastewater flow of the wastewater branch path according to the total dissolved solid value.
In one embodiment, when the total dissolved solid value of raw water in the main liquid supply path is less than a fixed value, the flow rate of the waste water in the waste water branch path is increased; when the total dissolved solid value of raw water in the main liquid supply path is larger than a fixed value, reducing the waste water flow of the waste water branch path; and when the total dissolved solid value of the raw water in the main liquid supply path is less than or equal to a fixed value, maintaining the flow of the waste water in the waste water branch path unchanged.
In one embodiment, the adjustment of the waste water flow of the waste water branch is realized by adjusting the opening degree of a second control valve on the waste water branch.
Drawings
Fig. 1 is a schematic view of a water purification apparatus in an embodiment.
Reference numerals:
10. a main liquid supply path; 20. a waste water branch; 30. a water purification branch; 100. a first detection device; 200. a heating device; 300. a second detection device; 400. a membrane filtration device; 500. a first control valve; 600. a pre-filtration device; 700. a pressure regulating device; 800. a water quality detection device; 900. a second control valve; 901. and a post-filtering device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In this application, unless expressly stated or limited otherwise, the terms "initially", "connected", "secured", and the like are to be construed broadly and can include, for example, fixedly connected, releasably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, in an embodiment, the water purifying apparatus includes a main liquid supply path 10, a water purifying branch 30, a first detecting device 100, a heating device 200, a second detecting device 300, a filter membrane device 400, and a control unit, the main liquid supply path 10 is used for inputting raw water, the water purifying branch 30 is communicated with the main liquid supply path 10, the filter membrane device 400 is disposed between the main liquid supply path 10 and the water purifying branch 30 and is used for filtering, the first detecting device 100 is disposed on the water purifying branch 30 and is used for detecting a water purifying flow of the water purifying branch 30, the second detecting device 300 is disposed on the main liquid supply path 10 and is used for detecting a water temperature of the main liquid supply path 10, and the heating device 200 is disposed on the main liquid supply path 10 and is used for heating.
The control unit is electrically connected to the first detecting device 100, the second detecting device 300, and the heating device 200, and controls the heating device 200 to open or close according to the purified water flow rate of the purified water branch 30 and the water temperature of the main liquid supply path 10.
It should be noted that, when the water purifying apparatus is in the water purifying mode, the raw water in the main liquid supply path 10 is filtered and purified by the membrane device 400, and both the flow rate and the temperature of the water input into the membrane device 400 affect the flow rate of the water output from the membrane device 40.
According to the water purifying equipment, the collected purified water flow of the purified water branch 30 and the water temperature of the main liquid supply path 10 are output to the control unit, and the control unit controls the heating device 200 to be opened and closed according to the purified water flow of the purified water branch 30 and the water temperature of the main liquid supply path 10, so that the water outlet flow of the filter membrane device 400 is kept constant, the purified water production rate is favorably improved, and meanwhile, the service life of the filter membrane device 400 is prolonged.
In the above embodiment, the on-state of the main liquid supply path 10 is not affected no matter whether the first detecting device 100, the heating device 200, the second detecting device 300, and the filter membrane device 400 are turned on, that is, the on-state of the main liquid supply path 10 is unrelated to the on-off states of the first detecting device 100, the heating device 200, the second detecting device 300, and the filter membrane device 400.
In this embodiment, the first detecting device 100 is a flow meter, the second detecting device 300 is a temperature probe, the control unit is a controller, and the heating device 200 is a tube heater or other type of heating device. In other embodiments, the first detecting device 100, the second detecting device 300, and the heating device 200 may be other types of components.
Referring to fig. 1, the water purifying apparatus further includes a first control valve 500, the first control valve 500 is disposed at a water inlet end of the main liquid supply path 10, and the control unit controls an opening degree of the first control valve 500 according to a purified water flow of the purified water branch 30.
It should be noted that the opening and closing of the main liquid supply path 10 is controlled by the first control valve 500. For example, when the water purifying device is in a water purifying mode, the main liquid supply path 10 is controlled to be opened; when the water purifying device is in the cleaning mode, the main liquid supply passage 10 is controlled to be closed and then opened.
Further, the flow rate of the main liquid supply path 10 can be controlled by the first control valve 500.
In the present embodiment, the first control valve 500 is a solenoid valve. In other embodiments, the first control valve 500 may also be other types of automatic control valves or manually controlled mechanical valves.
Referring to fig. 1, the water purifying apparatus further includes a pre-filtering device 600, the pre-filtering device 600 is disposed between the first control valve 500 and the heating device 200, and is used for pre-filtering the raw water in the main liquid supply path 10.
Specifically, the pre-filtering device 600 includes a plurality of filter elements, the filter elements are different in type and are connected in series to the main liquid supply path 10, and the filter membrane device 400 is a reverse osmosis filter membrane or a nanofiltration membrane.
Here, each filter element can be a PP cotton filter element, a granular activated carbon filter element and a compressed activated carbon filter element which are connected in series in sequence. After filtering the impurity in the former aquatic through prefilter 600 at first step, rethread filtration membrane device 400 filters the purification to former water, prevents effectively that large granule impurity from blockking up filtration membrane device 400 and can improve filtration membrane device 400's life.
Referring to fig. 1, the water purifying apparatus further includes a pressure regulating device 700, the pressure regulating device 700 is disposed in the main liquid supply path 10 and located at an upstream of the membrane unit 400, and the control unit controls whether the pressure regulating device 700 is pressurized or not according to a purified water flow of the purified water branch 30 and a water temperature of the main liquid supply path 10.
It will be appreciated that the flow rate and temperature of the water fed to the filter membrane unit 400 will affect the flow rate of the water out of the filter membrane unit 40. Before the water flow is input into the filter membrane device 400, the water flow can be pressurized through the pressure regulating device 700, so that the water outlet flow of the filter membrane device 400 is improved. For example, when the flow rate of the water flow is too small and the temperature is too low, the flow rate of the water flowing out of the filter membrane device 400 is reduced, and at this time, the pressure of the water flow can be increased by the pressure adjusting device 700, so that the flow rate of the water flowing out of the filter membrane device 400 is increased.
Optionally, the pressure regulating device 700 is an adjustable booster pump.
Referring to fig. 1, the water purifying apparatus further includes a water quality detecting device 800, a second control valve 900 and a waste water branch 20, the waste water branch 20 is connected to the liquid supply main path 10, the second control valve 900 is disposed in the waste water branch 20, the water quality detecting device 800 is disposed in the liquid supply main path 10 and is configured to detect a total dissolved solid value of raw water in the liquid supply main path 10, and the control unit controls an opening degree of the second control valve 900 according to the total dissolved solid value of raw water in the liquid supply main path 10.
It should be noted that after the raw water in the main liquid supply path 10 is filtered by the membrane device 400, waste water is discharged through the waste water branch path 20. The water quality detection device 800 detects the total dissolved solids of the raw water in the main liquid supply path 10, determines the quality of the raw water, and controls the opening of the second control valve 900 according to the quality of the raw water.
For example, when the total soluble solid value of the raw water is low, which indicates that the water quality is good, the opening degree of the second control valve 900 is increased, and the water purification apparatus is in the high wastewater recovery rate mode; when the total dissolved solid value of the raw water is high, which indicates that the water quality is poor, the opening degree of the second control valve 900 may be reduced, and the water purification apparatus is in the low wastewater recovery rate mode.
Alternatively, the water quality detecting device 800 is a TDS probe and the second control valve 900 is a solenoid valve or a mechanical valve.
Further, please refer to fig. 1, the water purifying apparatus further includes a post-filtering device 901, the post-filtering device 901 is disposed on the water purifying branch 30 and used for filtering the purified water of the water purifying branch 30.
Specifically, the post-filtering device 901 is an ultrafiltration composite filter element or a granular activated carbon filter element. After the water in the main liquid supply path 10 is filtered by the membrane unit 400, purified water is outputted through the purified water branch 30 for users to use. The taste of water purification can further be improved through after filter 901, improve user experience and feel.
Referring to fig. 1, a control method of a water purifying apparatus in an embodiment includes the following steps:
filtering the water flow in the main liquid supply path 10 and outputting purified water through the purified water branch 30;
detecting the purified water flow of the purified water branch 30;
comparing the flow of the purified water with a preset flow value;
when the flow rate of the purified water is greater than the preset flow rate value, controlling the heating device 200 to be closed; when the flow rate of the purified water is smaller than the preset flow rate, the water temperature of the main liquid supply path 10 is detected, and the heating device 200 is turned on when the water temperature of the main liquid supply path 10 is smaller than the preset temperature value.
In the control method of the water purifying device, the control unit controls the heating device 200 to be turned on or off according to the purified water flow of the purified water branch 30 and the water temperature of the main liquid supply path 10, so that the water outlet flow of the water purifying device is kept constant, the purified water production rate is improved, and the service life of the water purifying device is prolonged.
Referring to fig. 1, the step of filtering the water flow in the main liquid supply path 10 further includes: and determining whether the water flow in the main liquid supply path 10 is pressurized or not according to the purified water flow of the purified water branch 30 and the water temperature of the main liquid supply path 10.
It can be understood that the flow rate and temperature of the water in the main liquid supply path 10 affect the flow rate of the water out of the filter membrane device 400. Before the water flow is input into the filter membrane device 400, the water flow can be pressurized through the pressure regulating device 700, so that the water outlet flow of the filter membrane device 400 is improved.
Specifically, as shown in fig. 1, when the flow rate of the purified water is greater than the preset flow rate value, the water flow pressure in the main liquid supply path 10 is controlled to be in the standard working condition and the heating device 200 is turned off; when the flow of the purified water is smaller than the preset flow value and the water temperature of the main liquid supply path 10 is more than or equal to 25 ℃, controlling the water flow in the main liquid supply path 10 to be under a pressurization working condition and closing the heating device 200; when the flow rate of the purified water is smaller than the preset flow rate value and the water temperature of the main liquid supply path 10 is 15-25 ℃, controlling the water flow pressure in the main liquid supply path 10 to be in a standard working condition and starting the heating device 200; when the flow rate of the purified water is less than the preset flow rate and the water temperature of the main liquid supply path 10 is less than or equal to 15 ℃, controlling the water flow in the main liquid supply path 10 to be under a pressurization working condition and starting the heating device 200.
It should be noted that the standard operating condition is different from the pressurization operating condition in that the pressure to the water flow is different, and the pressure to the water flow is realized by adjusting the input voltage of the pressure regulating device 700.
Referring to fig. 1, the step of filtering the raw water in the main liquid supply path 10 further includes: the waste water branch 20 is communicated with the main liquid supply path 10, and waste water is output by the waste water branch 20; and detecting the total soluble solid value of the raw water in the main liquid supply path 10, and adjusting the wastewater flow of the wastewater branch path 20 according to the total soluble solid value.
It should be noted that after the raw water in the main liquid supply path 10 is filtered by the membrane device 400, waste water is discharged through the waste water branch path 20. The quality of the raw water can be judged by detecting the total soluble solid value of the raw water in the main liquid supply path 10, and the flow of the waste water in the waste water branch path 20 can be adjusted according to the quality of the water.
Specifically, as shown in fig. 1, when the total dissolved solid value of the raw water in the main liquid supply path 10 is less than a fixed value, the wastewater flow of the wastewater branch path 20 is increased; when the total dissolved solid value of the raw water in the main liquid supply path 10 is larger than a fixed value, the waste water flow of the waste water branch path 20 is reduced; when the total dissolved solid value of the raw water in the main liquid supply path 10 is less than or equal to a fixed value, the flow rate of the waste water in the waste water branch path 20 is kept unchanged.
In the present embodiment, the adjustment of the waste water flow rate of the waste water branch 20 is realized by adjusting the opening of the second control valve 900 on the waste water branch 20.
For example, when the opening degree of the second control valve 900 is increased, the flow rate of the wastewater branch 20 becomes large; when the opening degree of the second control valve 900 is decreased, the waste water flow of the waste water branch 20 becomes small.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A water purification apparatus, comprising:
a main liquid supply path (10) for inputting raw water;
a water purification branch (30) communicated with the main liquid supply path (10);
the filter membrane device (400) is arranged between the main liquid supply path (10) and the water purification branch path (30) and is used for filtering;
the first detection device (100) is arranged on the water purification branch (30) and is used for detecting the water purification flow of the water purification branch (30);
the second detection device (300) is arranged on the liquid supply main circuit (10) and is used for detecting the water temperature of the liquid supply main circuit (10);
the heating device (200) is arranged in the liquid supply main path (10) and is used for heating;
a control unit electrically connected to the first detection device (100), the second detection device (300), and the heating device (200); the control unit controls the heating device (200) to be opened or closed according to the purified water flow of the purified water branch (30) and the water temperature of the liquid supply main path (10).
2. The water purification apparatus according to claim 1, further comprising a first control valve (500), wherein the first control valve (500) is disposed at a water inlet end of the main liquid supply path (10), and the control unit controls an opening degree of the first control valve (500) according to a purified water flow of the purified water branch path (30).
3. The water purification apparatus according to claim 2, further comprising a pre-filtering device (600), wherein the pre-filtering device (600) is disposed between the first control valve (500) and the heating device (200) and is used for pre-filtering raw water of the main liquid supply path (10).
4. The water purification apparatus of claim 3, wherein the pre-filtering device (600) comprises a plurality of filter elements, the filter elements are different in type and are connected in series with the main liquid supply path (10), and the filter membrane device (400) is a reverse osmosis filter membrane or a nanofiltration membrane.
5. The water purification apparatus according to claim 1, further comprising a pressure regulating device (700), wherein the pressure regulating device (700) is disposed in the main liquid supply path (10) and located upstream of the membrane device (400), and the control unit controls whether the pressure regulating device (700) is pressurized or not according to the purified water flow rate of the purified water branch (30) and the water temperature of the main liquid supply path (10).
6. The water purifying apparatus according to claim 1, further comprising a water quality detecting device (800), a second control valve (900) and a waste water branch (20), wherein the waste water branch (20) is connected to the main liquid supply path (10) and is not connected to the water purifying branch (30), the second control valve (900) is disposed in the waste water branch (20), the water quality detecting device (800) is disposed in the main liquid supply path (10) and is configured to detect a total solid value of raw water solubility of the main liquid supply path (10), and the control unit controls an opening degree of the second control valve (900) according to the total solid value of raw water solubility of the main liquid supply path (10).
7. The water purifying apparatus of claim 6, further comprising a post-filtering device (901), wherein the post-filtering device (901) is disposed on the water purifying branch (30) and is used for filtering purified water of the water purifying branch (30).
8. A control method of a water purifying apparatus, comprising:
filtering the water flow in the main liquid supply path (10), and outputting purified water by the purified water branch path (30);
detecting the purified water flow of the purified water branch (30);
comparing the purified water flow with a preset flow value;
when the flow of the purified water is greater than a preset flow value, controlling the heating device (200) to be closed; when the flow of the purified water is smaller than a preset flow value, the water temperature of the main liquid supply path (10) is detected, and the heating device (200) is started when the water temperature of the main liquid supply path (10) is smaller than a preset temperature value.
9. The control method of water purification apparatus according to claim 8, wherein the step of filtering the water flow in the main liquid supply path (10) is preceded by the steps of:
and determining whether the water flow in the main liquid supply path (10) is pressurized or not according to the purified water flow of the purified water branch (30) and the water temperature of the main liquid supply path (10).
10. The control method of a water purifying apparatus as claimed in claim 9, comprising:
when the flow rate of the purified water is greater than a preset flow rate value, controlling the water flow pressure in the main liquid supply path (10) to be in a standard condition and turning off the heating device (200);
when the flow of the purified water is smaller than a preset flow value and the water temperature of the main liquid supply path (10) is more than or equal to 25 ℃, controlling the water flow in the main liquid supply path (10) to be in a pressurization condition and turning off the heating device (200);
when the flow rate of the purified water is smaller than the preset flow rate value and the water temperature of the main liquid supply path (10) is 15-25 ℃, controlling the water flow pressure in the main liquid supply path (10) to be in a standard working condition and starting the heating device (200);
when the flow rate of the purified water is smaller than the preset flow rate and the water temperature of the main liquid supply path (10) is less than or equal to 15 ℃, controlling the water flow in the main liquid supply path (10) to be in a pressurization condition and starting the heating device (200).
11. The control method of water purification apparatus according to claim 10, wherein the step of filtering the water flow in the main liquid supply path (10) is followed by the steps of:
communicating a waste water branch (20) with the main liquid supply path (10), and outputting waste water by the waste water branch (20);
and detecting the total soluble solid value of raw water in the main liquid supply path (10), and adjusting the wastewater flow of the wastewater branch path (20) according to the total soluble solid value.
12. The control method of water purification apparatus as claimed in claim 11, wherein when the total solid value of solubility of raw water in the main liquid supply path (10) is less than a fixed value, the flow rate of the waste water in the waste water branch path (20) is increased; when the total dissolved solid value of raw water in the main liquid supply path (10) is larger than a fixed value, the flow of the waste water branch path (20) is reduced; when the total dissolved solid value of raw water in the main liquid supply path (10) is less than or equal to a fixed value, the flow rate of the waste water branch path (20) is kept unchanged.
13. The control method of a water purification apparatus according to claim 11, wherein the adjustment of the wastewater flow rate of the wastewater branch (20) is performed by adjusting the opening degree of a second control valve (900) on the wastewater branch (20).
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