Filter element flushing device

Abstract

The utility model relates to a filter element flushing device, which comprises a flushing tank, a first medium flushing loop and a second medium flushing loop, the first medium flushing loop and the second medium flushing loop are connected with the flushing tank, and the first medium flushing loop and the second medium flushing loop are jointly connected with a purified water pipeline. The double-loop design is carried out on the filter element flushing device, cold and hot water alternate flushing can be carried out, hot water or cold water flushing can also be independently carried out, and dissolved substances are reduced to the maximum extent. And meanwhile, the filter element flushing device is also provided with a manual and automatic dual-function module, so that the production efficiency is greatly improved while the labor cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of liquid filtering and separation equipment, in particular to a filter element flushing device. Background Art

[0002] In the daily production process, liquid filter elements will inevitably bring in some particulate matter or fibrous impurities. These particulate matter and fibrous impurities may come from the influence of many factors such as the production environment, equipment wear, and filter medium shedding. These components will form a pollution source when the liquid filter element is used, causing pollution to the liquid to be filtered. Under the current production and technical environment conditions, these pollutions cannot be avoided and can only be removed by post-filtration. At the same time, when the liquid to be filtered is filtered, some dissolutions will also be produced during the contact between the filter medium and the liquid to be filtered. In order to reduce the impact of the dissolution on the filtered liquid, the dissolution should be brought into the cleaning liquid as much as possible during the flushing stage. Especially for liquid drug filtration, reducing the level of dissolution is extremely important for improving the safety of drugs. The existing filter element flushing device has the following problems in use:

[0003] (1) The single flushing volume of the filter element is small. On the one hand, the number of filter elements flushed at one time is small, and on the other hand, the amount of flushing water is small. It takes multiple reciprocating flushing to achieve a good effect.

[0004] (2) The degree of automation of filter element flushing is low, and it needs to be flushed through manual control. Although some liquids to be filtered with special requirements need to be properly controlled through manual control, the flushing process is time-consuming and labor-intensive in the overall standardized process. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide a filter element flushing device to solve one or more problems in the prior art.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A filter element flushing device comprises a flushing tank, the filter element flushing device also comprises a first medium flushing circuit and a second medium flushing circuit connected to the flushing tank, the first medium flushing circuit and the second medium flushing circuit are connected to a purified water pipeline.

[0008] Furthermore, the first medium flushing circuit includes a first water tank, which includes a first water inlet end, a second water inlet end, a first water outlet end, and a second water outlet end; the purified water pipeline is connected to the first water inlet end through a first branch, and a first valve is arranged on the first branch.

[0009] Furthermore, the first water outlet is connected to the inlet of the first water pump through the second valve, the outlet of the first water pump is connected to the inlet of the first filter through a manual valve, and the outlet of the first filter is connected to the inlet of the flushing tank through a manual valve and a third valve; the outlet of the flushing tank is connected to the second water inlet through a second branch, and a fourth valve is also arranged on the second branch; a manual valve is also arranged between the first water outlet and the second valve, and the second water outlet is connected to a fifth valve.

[0010] Furthermore, the second medium flushing circuit includes a second water tank, the second water tank includes a third water inlet end, a fourth water inlet end, a third water outlet end and a fourth water outlet end; the above-mentioned purified water pipeline is connected to the third water inlet end through a third branch, and a sixth valve is arranged on the third branch.

[0011] Furthermore, the third water outlet is connected to the inlet of the second water pump through the seventh valve, the outlet of the second water pump is connected to the inlet of the second filter through a manual valve, the outlet of the second filter is connected to the inlet of the flushing tank through a manual valve and an eighth valve, the outlet of the flushing tank is connected to the fourth water inlet through a fourth branch, and a ninth valve is also arranged on the fourth branch; a manual valve is also arranged between the third water outlet and the seventh valve, and the fourth water outlet is connected to the tenth valve.

[0012] Furthermore, the first filter is also connected to the fifth branch, and the fifth branch is provided with an eleventh valve and a manual valve; the second filter is also connected to the sixth branch, and the sixth branch is provided with a twelfth valve and a manual valve.

[0013] Furthermore, the inlet end of the flushing tank is connected to the purified water pipeline through the seventh branch, and a pressure sensor and a thirteenth valve are also arranged on the seventh branch. The flushing tank is also connected to the eighth branch, and a fourteenth valve and a manual valve are also arranged on the eighth branch.

[0014] Furthermore, the first filter, the second filter and the flushing tank each include a pressure gauge, a housing, a flange, a valve body and a filter element. The filter element is disposed in the housing, and the pressure gauge is connected to the top of the housing.

[0015] Furthermore, a filter element cover plate and a filter element mounting hole plate are also arranged inside the shell, and the filter element mounting hole plate is provided with at least one clamping hole, and the filter element can be clamped and matched with the clamping hole; the filtering accuracy of the filter element is not less than 0.45um.

[0016] Furthermore, the first water tank and the second water tank both include a liquid level sensor, a temperature sensor and a float, the float cooperates with the liquid level sensor, and the liquid level sensor cooperates with the first valve and the sixth valve respectively; the liquid level sensor also cooperates with the fifth valve and the tenth valve respectively; a heating resistor is also arranged inside the second water tank, and the heating resistor is connected to the temperature sensor.

[0017] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0018] (i) By providing a honeycomb-type snap-in interface on the filter element mounting plate and increasing the capacity of the filter element flushing tank, a large number of filter elements can be flushed simultaneously, thereby improving production efficiency.

[0019] (II) The filter element flushing device is designed with a dual circuit, which can perform alternating hot and cold water flushing, or hot water or cold water flushing alone, which minimizes the dissolution. At the same time, the filter element flushing device also has manual and automatic dual-function modules, which reduces labor costs and greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a filter of a filter element flushing device according to an embodiment of the utility model is shown.

[0021] Figure 2 A schematic structural diagram of a filter element mounting orifice plate of a filter element flushing device according to an embodiment of the utility model is shown.

[0022] Figure 3 A schematic diagram of the flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0023] Figure 4 A schematic diagram of the cold water circulation flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0024] Figure 5 A schematic diagram of the hot water circulation flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0025] Figure 6 A schematic diagram of the rinsing and flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0026] Figure 7 A schematic diagram of the cold water flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0027] Figure 8 A schematic diagram of the hot water flushing principle of a filter element flushing device according to an embodiment of the utility model is shown.

[0028] Markings in the attached drawings: 1, pressure gauge; 2, housing; 3, flange; 4, filter cover; 5, valve body; 6, filter; 7, filter mounting hole; 701, clamp hole; 8, liquid level sensor; 9, temperature sensor; 10, pressure sensor; 11, manual valve; 1201, first valve; 1202, second valve; 1203, third valve; 1204, fourth valve; 1205, fifth valve; 1206, sixth valve; 1207, seventh valve; 1208, eighth valve; 1209, ninth valve; 1210, tenth valve; 1211, eleventh valve; 1212, twelfth valve; 1213, thirteenth valve; 1214, fourteenth valve; 13, Float; 14. First filter; 15. Second filter; 16. Flushing tank; 17. First water tank; 1701. First water inlet; 1702. Second water inlet; 1703. First water outlet; 1704. Second water outlet; 18. Second water tank; 1801. Third water inlet; 1802. Fourth water inlet; 1803. Third water outlet; 1804. Fourth water outlet; 19. Heating resistor; 20. First water pump; 21. Second water pump; 22. First branch; 23. Second branch; 24. Third branch; 25. Fourth branch; 26. Fifth branch; 27. Sixth branch; 28. Seventh branch; 29. ​​Eighth branch. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following is a further detailed description of a filter element flushing device proposed in the utility model in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so it has no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model.

[0030] See also Figure 1 and Figure 2The filter element flushing device and the use method thereof of the present embodiment include a flushing tank 16, and the flushing tank 16 includes a pressure gauge 1, a shell 2, a flange 3, a filter element cover plate 4 and a valve body 5. The opening of the flange 3 is located at the upper part of the flushing tank 16, and a filter element mounting hole plate 7 is also arranged inside the shell 2. The mounting position of the filter element mounting hole plate 7 is located at the bottom of the flushing tank 16, and the filter element mounting hole plate 7 is provided with at least one clamping hole 701. Preferably, the filter element mounting hole plate 7 in the present embodiment has twenty mounting holes, and in other embodiments, it can also be other numbers besides twenty. The filter element 6 can be clamped to cooperate with the clamping hole 701. When the number of the filter element 6 to be flushed is less than the number of mounting holes of the filter element mounting hole plate 7, it is preferred to use a snap-in blind plate to block the remaining holes. The filtration accuracy of the filter element 6 is not less than 0.45um.

[0031] Please continue reading Figure 3 , the filter element flushing device also includes a first water tank 17, a second water tank 18, a first filter 14, a second filter 15, a first water pump 20 and a second water pump 21. Preferably, in this embodiment, the first water tank 17 is a cold water tank, the second water tank 18 is a hot water tank, the first filter 14 is a cold water filter, the second filter 15 is a hot water filter, the first water pump 20 is a cold water pump, and the second water pump 21 is a hot water pump. In this embodiment, the first filter 14 and the second filter 15 are the same as the above-mentioned flushing tank 16 except that the position of the flange 3 is different. When the pressure of the pressure gauge 1 of the first filter 14, the second filter 15 and the flushing tank 16 is lower than the set value, it is assumed that the system pipeline is in an open circuit state, the startup conditions are not met, any flushing process cannot be started, and an alarm is triggered. Preferably, the method of use described in this embodiment includes two modes: manual and automatic. In the manual mode, there is an interlocking relationship between the various components.

[0032] The filter element flushing device also includes a manual valve 11, a first valve 1201, a second valve 1202, a third valve 1203, a fourth valve 1204, a fifth valve 1205, a sixth valve 1206, a seventh valve 1207, an eighth valve 1208, a ninth valve 1209, a tenth valve 1210, an eleventh valve 1211, a twelfth valve 1212, a thirteenth valve 1213 and a fourteenth valve 1214, and each component is connected by a pipeline.

[0033] Please continue reading Figures 3 to 5, the first water tank 17 and the second water tank 18 both include a liquid level sensor 8, a temperature sensor 9, and a float 13. The liquid level sensor 8 and the temperature sensor 9 are used to detect the liquid level and temperature parameters in the first water tank 17 and the second water tank 18, respectively. A heating resistor 19 is also provided inside the second water tank 18. The heating resistor 19 is used to heat the water in the second water tank 18, and the heating resistor 19 is connected to the temperature sensor 9. The float 13 cooperates with the liquid level sensor 8. The liquid level sensor 8 cooperates with the first valve 1201 and the sixth valve 1206, respectively, and the liquid level sensor 8 also cooperates with the fifth valve 1205 and the tenth valve 1210, respectively. The filter element flushing device also includes a first medium flushing circuit and a second medium flushing circuit connected to the flushing tank 16, and the first medium flushing circuit and the second medium flushing circuit are connected to the purified water pipeline together. The first medium flushing circuit includes a first water tank 17, and the first water tank 17 includes a first water inlet end 1701, a second water inlet end 1702, a first water outlet end 1703, and a second water outlet end 1704. The purified water pipeline is connected to the first water inlet end 1701 through a first branch 22 for water replenishment, and a first valve 1201 is provided on the first branch 22. The first water outlet end 1703 is connected to the inlet of the first water pump 20 through a second valve 1202, and the outlet of the first water pump 20 is connected to the inlet of the first filter 14 through a manual valve 11, and the outlet of the first filter 14 is connected to the inlet of the flushing tank 16 through the manual valve 11 and the third valve 1203. The outlet of the flushing tank 16 is connected to the second water inlet end 1702 through a second branch 23, and a fourth valve 1204 is also provided on the second branch 23. A manual valve 11 is also provided between the first water outlet 1703 and the second valve 1202. After the elution content in the first water tank 17 accumulates after the flushing procedure, the water source in the first water tank 17 is removed and replaced through the manual valve 11. The second water outlet 1704 is connected to the fifth valve 1205. Preferably, in this embodiment, the first medium flushing circuit is a cold water circulation flushing procedure.

[0034] For further information, please refer to Figure 3 and Figure 4 , the cold water circulation and rinsing combined with flushing procedure, i.e., the first water tank 17, the first water pump 20, the first filter 14 and the flushing tank 16 are also connected to each other via the manual valve 11, the second valve 1202, the third valve 1203 and the fourteenth valve 1214. At this time, the eighth valve 1208, the ninth valve 1209, the thirteenth valve 1213 and the fourteenth valve 1214 are closed, the second valve 1202 and the third valve 1203 are opened, the second water pump 21 is stopped, and the first water pump 20 is running.

[0035] Please continue reading Figures 3 to 5The second medium flushing circuit includes a second water tank 18, and the second water tank 18 includes a third water inlet end 1801, a fourth water inlet end 1802, a third water outlet end 1803 and a fourth water outlet end 1804. The purified water pipeline is connected to the third water inlet end 1801 through a third branch 24, and a sixth valve 1206 is arranged on the third branch 24. The third water outlet end 1803 is connected to the inlet of the second water pump 21 through a seventh valve 1207, and the outlet of the second water pump 21 is connected to the inlet of the second filter 15 through a manual valve 11, and the outlet of the second filter 15 is connected to the inlet of the flushing tank 16 through the manual valve 11 and the eighth valve 1208, and the outlet of the flushing tank 16 is connected to the fourth water inlet end 1802 through a fourth branch 25, and a ninth valve 1209 is also arranged on the fourth branch 25. A manual valve 11 is also provided between the third water outlet 1803 and the seventh valve 1207. After the elution content in the second water tank 18 accumulates after the flushing procedure, the water source in the second water tank 18 is removed and replaced through the manual valve 11. The fourth water outlet 1804 is connected to the tenth valve 1210. Preferably, in this embodiment, the second medium flushing circuit is a hot water circulation flushing procedure.

[0036] For further information, please refer to Figure 3 and Figure 5 , the hot water circulation and rinsing combined with the flushing procedure, that is, the second water tank 18, the second water pump 21, the second filter 15 and the flushing tank 16 are connected to each other via the manual valve 11, the seventh valve 1207, the eighth valve 1208 and the ninth valve 1209. At this time, the third valve 1203, the fourth valve 1204, the thirteenth valve 1213 and the fourteenth valve 1214 are closed, the seventh valve 1207 and the eighth valve 1208 are opened, the second water pump 21 is running, and the first water pump 20 is stopped.

[0037] Furthermore, the liquid level sensors of the first water tank 17 and the second water tank 18 have high liquid level and low liquid level alarms. After the low liquid level alarm is triggered, the first valve 1201 and the sixth valve 1206 corresponding to the first water tank 17 and the second water tank 18 are replenished with water. When the water is replenished to trigger the high liquid level alarm, the first valve 1201 and the sixth valve 1206 are closed, and the water replenishment is stopped. The excess water is discharged through the second water outlet 1704 and / or the fourth water outlet 1804. Preferably, in this embodiment, the lower edge of the second water outlet 1704 and the fourth water outlet 1804 is consistent with the horizontal height of the high liquid level alarm trigger point of the hydraulic sensor 8, and a one-way valve is installed on the second water outlet 1704 and the fourth water outlet 1804, so that the water can only flow out, which can prevent back suction and microbial contamination. The second water tank 18 also has a heating function, which can be electric heating or steam heating, preferably electric heating. The second water tank 18 can be temperature-set, and different hot flushing temperatures can be selected according to the material of the filter element to be flushed, and the temperature range can be set to 30-80°C. The second water tank 18 has high and low water temperature alarms in the control program, and the alarm range can be selected from ±2°C of the set temperature or other acceptable temperature ranges. The second water tank 18 can automatically stop heating and replenish water after triggering the high water temperature alarm, and continue heating after triggering the low water temperature alarm. After the water temperature alarm, the flushing program operated by the first water pump 20 and / or the second water pump 21 involved stops running, and the system can automatically execute the unfinished flushing program after the water temperature alarm is released.

[0038] Please continue reading Figure 6 The inlet end of the flushing tank 16 is also connected to the purified water pipeline through the seventh branch 28, and the seventh branch 28 is also provided with a pressure sensor 10 and a thirteenth valve 1213. The flushing tank 16 is also connected to the eighth branch 29, and the eight branch 29 is also provided with a fourteenth valve 1214 and a manual valve 11. The pressure sensor 10 is used to monitor the water pressure in the pipeline to ensure the safety of the operation. Preferably, the illustrated path is the path of the separate rinsing and flushing procedure.

[0039] For further information, please refer to Figure 3 and Figure 6 , the single rinsing procedure, i.e., the flushing tank 16 is connected to the purified water pipeline via the fifth valve 1205, the sixth valve 1206, the manual valve 11 and the pressure sensor 10. At this time, the third valve 1203, the fourth valve 1204, the eighth valve 1208 and the ninth valve 1209 are closed, the thirteenth valve 1213 and the fourteenth valve 1214 are opened, and the first water pump 20 and the second water pump 21 are stopped.

[0040] Please continue reading Figure 7 The first filter 14 is also connected to the fifth branch 26, and the fifth branch 26 is provided with an eleventh valve 1211 and a manual valve 11. Preferably, the illustrated path is the path of the separate cold water flushing program. Figure 8 The second filter 15 is also connected to the sixth branch 27, and the sixth branch 27 is provided with a twelfth valve 1212 and a manual valve 11. Preferably, the illustrated path is the path of the separate hot water flushing program.

[0041] Please continue reading Figures 6 to 8 The fourteenth valve 1214, the eleventh valve 1211 and the twelfth valve 1212 are respectively connected to the flushing tank 16, the first water tank 17 and the second water tank 18 to discharge the residual water in the flushing tank 16, the first water tank 17 and the second water tank 18 after flushing is completed.

[0042] Furthermore, when the manual mode is switched to the automatic mode, all valves except the first valve 1201 and the sixth valve 1206 are closed, the first water pump 20 and the second water pump 21 are stopped, and the system automatically flushes according to the set program.

[0043] In particular, please continue to see Figure 3 In this embodiment, there is an automatic hot and cold water alternating flushing program, which is composed of the first medium flushing circuit and the second medium flushing circuit. Preferably, the automatic hot and cold water alternating flushing program in this embodiment is to rinse, hot water circulation wash, rinse, cold water circulation wash for 5 minutes, rinse and rinse in sequence, and the running time of each program is set according to needs.

[0044] In particular, in this embodiment, different procedures are selected for testing. The flushing tank 16 is designed as a flushing system according to a 50-core 10-inch standard filter element. Taking the flushing of the PES filter element as an example, the hot water flushing temperature is selected to be 50°C, and the filter element is flushed in the automatic mode according to the procedure of 30 seconds of rinsing - 10 minutes of hot water circulation - 15 seconds of rinsing - 5 minutes of cold water circulation - 1 minute of rinsing. In the cold water comparison test, the 10-minute hot water circulation is replaced with 10 minutes of cold water circulation. In the rinsing comparison test, the 10-minute hot water circulation and the 5-minute cold water circulation are both replaced with rinsing, that is, 16 minutes and 45 seconds of rinsing. The filter element cleaned by various procedures is tested for dissolution. The dissolution levels after cold water rinsing, hot water rinsing, rinsing, and alternating cold and hot water rinsing are 72.1ppm, 29.0ppm, 35.7ppm, and 20.8ppm, respectively.

[0045] It is known from the above experimental data that after the filter element 6 is flushed alternately with cold and hot water, the content of dissolved matter is the least and the effect is the best.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A filter element flushing device, comprising a flushing tank, characterized in that: The filter element flushing device further comprises a first medium flushing circuit and a second medium flushing circuit connected to the flushing tank, and the first medium flushing circuit and the second medium flushing circuit are connected to a purified water pipeline.

2. A filter element flushing device according to claim 1, characterized in that: The first medium flushing circuit includes a first water tank, which includes a first water inlet end, a second water inlet end, a first water outlet end and a second water outlet end; the purified water pipeline is connected to the first water inlet end through a first branch, and a first valve is arranged on the first branch.

3. A filter element flushing device as claimed in claim 2, characterized in that: The first water outlet is connected to the inlet of the first water pump through the second valve, the outlet of the first water pump is connected to the inlet of the first filter through a manual valve, and the outlet of the first filter is connected to the inlet of the flushing tank through a manual valve and a third valve; the outlet of the flushing tank is connected to the second water inlet through a second branch, and a fourth valve is also arranged on the second branch; a manual valve is also arranged between the first water outlet and the second valve, and the second water outlet is connected to a fifth valve.

4. A filter element flushing device as claimed in claim 3, characterized in that: The second medium flushing circuit includes a second water tank, which includes a third water inlet, a fourth water inlet, a third water outlet and a fourth water outlet; the purified water pipeline is connected to the third water inlet through a third branch, and a sixth valve is arranged on the third branch.

5. A filter element flushing device as claimed in claim 4, characterized in that: The third water outlet is connected to the inlet of the second water pump through the seventh valve, the outlet of the second water pump is connected to the inlet of the second filter through a manual valve, the outlet of the second filter is connected to the inlet of the flushing tank through a manual valve and an eighth valve, the outlet of the flushing tank is connected to the fourth water inlet through a fourth branch, and a ninth valve is also arranged on the fourth branch; a manual valve is also arranged between the third water outlet and the seventh valve, and the fourth water outlet is connected to the tenth valve.

6. A filter element flushing device as claimed in claim 5, characterized in that: The first filter is also connected to the fifth branch, on which an eleventh valve and a manual valve are arranged; the second filter is also connected to the sixth branch, on which a twelfth valve and a manual valve are arranged.

7. A filter element flushing device according to claim 1, characterized in that: The inlet end of the flushing tank is also connected to the purified water pipeline through the seventh branch, and a pressure sensor and a thirteenth valve are also arranged on the seventh branch. The flushing tank is also connected to the eighth branch, and a fourteenth valve and a manual valve are also arranged on the eighth branch.

8. A filter element flushing device as claimed in claim 6, characterized in that: The first filter, the second filter and the flushing tank all include a pressure gauge, a shell, a flange, a valve body and a filter element. The filter element is arranged in the shell, and the pressure gauge is connected to the top of the shell.

9. A filter element flushing device as claimed in claim 8, characterized in that: A filter element cover plate and a filter element mounting hole plate are also arranged inside the shell. The filter element mounting hole plate is provided with at least one clamping hole, and the filter element can be clamped and matched with the clamping hole. The filtering accuracy of the filter element is not less than 0.45um.

10. A filter element flushing device according to claim 9, characterized in that: The first water tank and the second water tank both include a liquid level sensor, a temperature sensor and a float, the float cooperates with the liquid level sensor, and the liquid level sensor cooperates with the first valve and the sixth valve respectively; the liquid level sensor also cooperates with the fifth valve and the tenth valve respectively; a heating resistor is also arranged inside the second water tank, and the heating resistor is connected to the temperature sensor.

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