CN115682438B - Water tank water leakage detection device, heat pump system and control method - Google Patents
Water tank water leakage detection device, heat pump system and control method Download PDFInfo
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- 238000002347 injection Methods 0.000 claims abstract description 47
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- 239000007788 liquid Substances 0.000 claims abstract description 41
- 230000001502 supplementing effect Effects 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims abstract description 8
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- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a water tank water leakage detection device, a heat pump system and a control method, which belong to the design field of water tank leakage detection devices, wherein the water tank water leakage detection device comprises: the water injection assembly is controllably communicated with the water cavity of the water tank through a first pipeline, and water in the water tank can exchange heat with the refrigerant in the first heat exchanger in the heat pump system; the water replenishing tank is controllably communicated with the first pipeline through a second pipeline, a liquid level detection part is arranged in the water replenishing tank, and the water replenishing tank is further provided with an exhaust pipe which can be selectively cut off. According to the invention, whether the water level changes and the water level changes are detected by the liquid level detection component in the water supplementing tank, so that whether the water tank has water leakage phenomenon and whether the water leakage phenomenon is serious or not in the water injection deformation process is judged, other high-precision sensors are not needed for detecting water leakage of the water tank, the water leakage detection cost is effectively controlled, and the water leakage detection efficiency is higher.
Description
Technical Field
The invention belongs to the field of design of water tank leakage detection devices, and particularly relates to a water tank leakage detection device, a heat pump system and a control method.
Background
The ground source heat pump system has the advantages of energy conservation, environmental protection, safe and stable operation and the like, so that the ground source heat pump system is rapidly developed, has the basic functions of refrigeration and heating, can reduce or raise the environmental temperature at the use side, and can heat domestic water by using the double-pipe heat exchanger to provide domestic hot water for users. Because of the large difference of local water supply and different water quality of the water supply, heat exchanger corrosion water leakage occurs in some areas, the earlier stage water leakage amount of water leakage is usually small, the water leakage flow rate can not reach the minimum precision of the flow sensor, serious waste of water resources can be caused for a long time, and water leakage faults are not found all the time, so that the heat exchange efficiency can be influenced and the energy is wasted during use.
The water leakage detection can effectively avoid the occurrence of the above situations, but the existing water leakage detection sensor and other additional detection devices are used for detecting the water leakage situation inside the water tank. In a related aspect, the detection device has components such as a positive electrode probe and a negative electrode probe independent of the housing, which is relatively costly. The patent number CN210648408U discloses a water heater with a water leakage detection mechanism, and a loop is formed by an electric conduction part, water in a water leakage collecting tank, a metal shell and an alarm, so that the alarm outputs a water leakage signal, but the detection device has more parts and high cost.
Disclosure of Invention
Therefore, the invention provides the water tank water leakage detection device, the heat pump system and the control method, which can solve the technical problems that the water tank water leakage detection device with lower detection sensitivity in the prior art is difficult to find in time, so that the heat exchange efficiency is affected, the energy is wasted, and the detection device with higher detection sensitivity has higher cost.
In order to solve the above problems, the present invention provides a water leakage detection device for a water tank, comprising:
the water injection assembly is controllably communicated with the water cavity of the water tank through a first pipeline, and water in the water tank can exchange heat with the refrigerant in the first heat exchanger in the heat pump system;
The water replenishing tank is controllably communicated with the first pipeline through a second pipeline, a liquid level detection part is arranged in the water replenishing tank, and the water replenishing tank is further provided with an exhaust pipe which can be selectively cut off.
In some embodiments of the present invention, in some embodiments,
The water injection assembly comprises a liquid pipe and a water injection piston inserted in the liquid pipe.
In some embodiments of the present invention, in some embodiments,
The reciprocating driving component is provided with a permanent magnet at the tail end of the water injection piston and an electromagnetic component which is arranged opposite to the permanent magnet, and the electromagnetic component can realize the repulsion or adsorption of the permanent magnet.
In some embodiments of the present invention, in some embodiments,
And a pressure detection element is arranged between the permanent magnet and the electromagnetic component, and when the real-time pressure detected by the pressure detection element reaches a preset pressure value, the current of the electromagnetic component is kept unchanged.
In some embodiments of the present invention, in some embodiments,
The liquid level detection component is a liquid level sensor; and/or a first electromagnetic stop valve is connected in series on the first pipeline, the connection point of the second pipeline and the first pipeline is a first connection point, and the first electromagnetic stop valve is positioned between the first connection point and the water tank; and a second electromagnetic stop valve is connected in series on the second pipeline, and a third electromagnetic stop valve is connected in series on the exhaust pipe.
The invention also provides a heat pump system, which comprises the water tank water leakage detection device.
In some embodiments, the heat pump system further comprises a first heat exchanger and a compressor, wherein an exhaust port of the compressor is communicated with the first heat exchanger, and heat exchange is realized between the refrigerant in the first heat exchanger and water in the water tank through a water circulation system.
The invention also provides a control method of the heat pump system, which comprises the following steps:
Acquiring a control instruction;
when the acquired control instruction is a water leakage detection instruction, a water outlet valve of the water tank is controlled to be closed and full of water;
Controlling the water tank, the water supplementing tank and the liquid pipe to be communicated, and controlling the second pipeline to be cut off after the water pressures of the water tank, the water supplementing tank and the liquid pipe are balanced;
controlling the water injection piston to move a preset distance from an initial position towards one side of the water tank so as to enable water in the liquid pipe to enter the water tank;
after the water injection piston is located at the preset distance for a first preset time, controlling the water injection piston to retract to the initial position;
Controlling the second pipeline to be communicated and waiting for a second preset time;
Acquiring water level values corresponding to the initial position in the water supplementing tank for two times, namely a first water level and a second water level;
and obtaining the water leakage state of the water tank according to the difference value between the first water level and the second water level.
In some embodiments, obtaining the water leakage state of the water tank according to the difference between the first water level and the second water level includes:
Obtaining the descending volume of water in the water supplementing tank as V B according to the first water level and the second water level, closing a water inlet valve of the water tank and sending an alarm message of severe water leakage when b is more than or equal to V B and less than or equal to a; when a is more than V B and less than or equal to b, sending out an alarm message of moderate water leakage; when V B is more than 0 and less than or equal to a, an alarm message of slight water leakage is sent out.
In some embodiments of the present invention, in some embodiments,
The water injection piston moves back and forth for a plurality of times, the first water level corresponds to the water level in the water supplementing tank corresponding to the first initial position of the water injection piston, and the second water level corresponds to the water level in the water supplementing tank corresponding to the last initial position of the water injection piston; and/or the preset position is a position corresponding to the water pressure in the water tank reaching the maximum allowable pressure.
In some embodiments of the present invention, in some embodiments,
Acquiring a habit of a user for taking hot water so as to acquire a use intermittent interval of the water tank, and sending out a water leakage detection instruction when the water tank is positioned in the use intermittent interval; and/or controlling the exhaust pipe to be communicated with the outside in the water pressure balancing process of the water tank, the water supplementing tank and the liquid pipe.
According to the water tank water leakage detection device, the heat pump system and the control method, water in the water tank water leakage detection device can be filled in the water tank in a full water state through the water injection assembly, the water tank shell can be pressed outwards to generate moderate elastic deformation, whether the water level changes and the water level changes are detected through the liquid level detection component in the water supplementing tank or not, whether the water tank is water leakage or not and whether the water leakage phenomenon is serious or not are judged in the water injection deformation process or not further, other high-precision sensors are not needed to detect water leakage of the water tank, water leakage detection cost is effectively controlled, and water leakage of a water leakage point can be exposed due to the fact that the water injection assembly exerts pressure on the water tank in the water injection process, further the water leakage is fed back clearly in the water supplementing tank, and the water leakage detection efficiency is higher.
Drawings
Fig. 1 is a schematic diagram of a water leakage detection device of a water tank according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a heat pump system according to another embodiment of the present invention;
fig. 3 is a schematic flow chart of control logic of a heat pump system according to still another embodiment of the present invention.
The reference numerals are expressed as:
11. A liquid pipe; 12. a water injection piston; 2. a water supplementing tank; 21. an exhaust pipe; 22. a liquid level detection part; 3. a pressure detecting element; 41. a first electromagnetic shut-off valve; 42. a second electromagnetic shut-off valve; 43. a third electromagnetic shut-off valve; 100. a water tank; 1001. a water inlet valve; 1002. a water outlet valve; 1003. a water pump; 101. a first heat exchanger; 102. a compressor; 103. a second heat exchanger; 104. a third heat exchanger; 105. a four-way valve; 106. a throttle element; 200. a water leakage detection device of the water tank; 201. and a controller.
Detailed Description
Referring to fig. 1 to 3 in combination, according to an embodiment of the present invention, there is provided a water leakage detection device for a water tank, including: the water injection assembly is controllably communicated with the water cavity of the water tank 100 through a first pipeline, and water in the water tank 100 can exchange heat with the refrigerant in the first heat exchanger 101 in the heat pump system, so that the requirement of a user for taking hot water from the water tank 100 is met; the water replenishing tank 2 is controllably communicated with the first pipeline through the second pipeline, a liquid level detection component 22 (such as a liquid level sensor) is arranged in the water replenishing tank 2, and the water replenishing tank 2 is further provided with an exhaust pipe 21 which can be cut off selectively, so that smooth water injection in the water replenishing tank 2 and even in the water tank 100 is facilitated. According to the technical scheme, water in the water tank 100 in a full water state can be filled into the water tank 100 through the water injection assembly, the characteristic that the shell of the water tank 100 can be pressed outwards to generate moderate elastic deformation can be utilized, whether the water level changes and the water level changes are detected through the liquid level detection component 22 in the water supplementing tank 2, whether the water tank leaks or not and whether the water leakage phenomenon is serious or not are judged in the water injection deformation process, other high-precision sensors are not needed for detecting water leakage of the water tank, the water leakage detection cost is effectively controlled, and water leakage of a water leakage point can be exposed due to the fact that the water injection assembly applies pressure on the water tank 100 in the water injection process, further the water leakage is fed back more definitely in the water supplementing tank 2, and the water leakage detection efficiency is higher. It will be appreciated that in order to more clearly detect the level change in the tank 2, the tank 2 may preferably be an elongate cylinder with a cross-sectional area S B as small as possible to ensure that very small leaks are also able to have a more pronounced level change (H B).
As a specific implementation manner of the water injection assembly, the water injection assembly comprises a liquid pipe 11 and a water injection piston 12 inserted in the liquid pipe 11, and the water in the liquid pipe 11 is injected into the water tank 100 in a full water state by controlling the linear movement of the water injection piston 12 towards one side of the water tank 100, so that the water injection assembly is simple in structure and convenient to implement. The linear displacement of the water injection piston 12 may be generated by manual force application or by automatic force application, that is, a reciprocating driving component may be provided, so that the water injection piston 12 can be forced to move linearly towards or away from the water tank 100 by mechanically and automatically applying force to the water injection piston 12, and in a preferred embodiment, the reciprocating driving component has a permanent magnet (that is, the magnetism and magnetic force thereof are determined, not shown in the figure) at the end of the water injection piston 12 and an electromagnetic component (not shown in the figure) disposed opposite to the permanent magnet, and the electromagnetic component is specifically an energized coil with an iron core, and the magnetism and magnetic force of the electromagnetic component can be controlled by passing current and direction in the energized coil, so that the permanent magnet is repelled or absorbed, and the control is simple and reliable.
In some embodiments, a pressure detecting element 3 is provided between the permanent magnet and the electromagnetic component, and when the real-time pressure detected by the pressure detecting element 3 reaches a preset pressure value, the current magnitude of the electromagnetic component is kept unchanged, and the pressure detecting element 3 may specifically be a pressure sensor for detecting the repulsive force applied by the electromagnetic component to the permanent magnet, that is, the magnitude of the axial thrust force finally applied to the water injection piston 12, so that the repulsive force is within a preset range, and the preset pressure value is specifically determined according to the maximum allowable pressure of the water tank 100, so as to ensure that the water tank 100 can expand outwards to generate proper elastic deformation without causing substantial damage to the water tank 100. It will be appreciated that when the force applied to the water filling piston 12 reaches the preset pressure value, the water filling piston 12 at this time will move from the initial position to the preset position, i.e. the final position of the water filling piston 12, i.e. the position of the water filling piston 12 can no longer be controlled towards the water tank 100 to prevent damage to the water tank 100, i.e. the preset position is the position corresponding to when the water pressure in the water tank 100 reaches the maximum allowable pressure (i.e. P A).
The first pipeline is connected with a first electromagnetic stop valve 41 in series, the connection point of the second pipeline and the first pipeline is a first connection point, and the first electromagnetic stop valve 41 is positioned between the first connection point and the water tank 100; a second electromagnetic stop valve 42 is connected in series with the second pipeline, and a third electromagnetic stop valve 43 is connected in series with the exhaust pipe 21. The water leakage detection device for a water tank is further provided with a controller 201, wherein the controller 201 is configured to automatically control the on/off of the first electromagnetic cut-off valve 41, the second electromagnetic cut-off valve 42, and the third electromagnetic cut-off valve 43, and is also configured to control the magnitude and direction of the current in the energized coil, receive and determine the parameter signals detected by the liquid level detection member 22 and the pressure detection element 3, perform necessary operations, and issue corresponding control instructions based on the respective operation results.
According to an embodiment of the present invention, referring to fig. 2, there is further provided a heat pump system including a water tank leakage detection device 200, wherein the water tank leakage detection device 200 is the water tank leakage detection device described above. Specifically, the heat pump system further includes a first heat exchanger 101, a compressor 102, a second heat exchanger 103, a third heat exchanger 104, a four-way valve 105, and a throttling element 106, wherein the above components form a refrigerant cycle, an exhaust port of the compressor 102 is communicated with the first heat exchanger 101, and a high-temperature and high-pressure refrigerant discharged by the compressor 102 enters the first heat exchanger 101 and exchanges heat with water in the water tank 100 through a water circulation system. When the aforementioned heat pump system is a ground source heat pump, it serves as an outdoor side heat exchanger, specifically, for example, the second heat exchanger 103 is buried in the ground.
According to an embodiment of the present invention, referring to fig. 3, there is also provided a control method of the heat pump system as described above, including the steps of:
Acquiring a control instruction;
When the acquired control instruction is a water leakage detection instruction, the water outlet valve of the water tank 100 is controlled to be closed and filled with water, so that the water filled in the liquid pipe 11 can generate preset pressure, and the compression of the gas in the water tank 100 is prevented from reducing the accuracy of a water leakage detection result;
The water tank 100, the water replenishing tank 2 and the liquid pipe 11 are controlled to be communicated (the first electromagnetic stop valve 41, the second electromagnetic stop valve 42 and the third electromagnetic stop valve 43 are all in a communicated state), after the water pressure of the water tank 100, the water replenishing tank 2 and the liquid pipe 11 is balanced, the second pipe is controlled to be cut off, the state is taken as an initial state of water leakage detection, and it is noted that in the initial state, the water pipe 11, the water replenishing tank 2 and the liquid pipe 11 are filled with water, the water replenishing tank 2 is filled with water, the position where the water filling piston 12 is located is the initial position, and the water level in the water replenishing tank 2 is the first water level;
After the second pipe is cut off (i.e., the second electromagnetic cut-off valve 42 is in a cut-off state), the water injection piston 12 is controlled to move from the initial position toward one side of the water tank 100 by a preset distance (i.e., at a preset position, lmax) so that water in the liquid pipe 11 enters the water tank 100, the water entering the water tank 100 forces the housing of the water tank 100 to undergo a slight elastic deformation, and after the water injection piston 12 is at the preset distance for a first preset time (ta), the water injection piston 12 is controlled to retract to the initial position; controlling the second pipeline to be communicated and waiting for a second preset time (tb) to stabilize the water level in the water supplementing tank 2, and at the moment, closing the first electromagnetic stop valve 41 and the second electromagnetic stop valve 42 again; the first preset time and the second preset time can be reasonably selected according to actual needs; acquiring water level values corresponding to an initial position in the water supplementing tank 2 for two times, namely a first water level and a second water level; the water leakage state of the water tank 100 is obtained according to the difference between the first water level and the second water level.
In this technical solution, when the water tank 100 is in a full state, the water in the liquid pipe 11 is forced to be injected into the water tank 100 by the water injection piston 12, so that the water tank 100 is elastically deformed appropriately, if the water tank 100 has a water leakage defect, the liquid level difference in the water tank 100 is finally detected by the liquid level detecting part 22 in the water replenishing tank 2, and then whether the water tank 100 has water leakage or the degree of water leakage can be clearly judged by the size of the liquid level difference. The technical scheme adopts an active pressurization mode to detect tiny leakage (namely slow leakage) of the water tank 100, improves water leakage detection efficiency and heat exchange efficiency, prevents accelerated corrosion of equipment caused by water leakage, ensures the service life of the equipment and saves resources.
Specifically, obtaining the water leakage state of the water tank 100 according to the difference between the first water level and the second water level includes:
Obtaining the descending volume of water in the water supplementing tank 2 as V B according to the first water level and the second water level, closing the water inlet valve of the water tank 100 and sending an alarm message of severe water leakage when b is less than V B and less than or equal to a; when a is more than V B and less than or equal to b, sending out an alarm message of moderate water leakage, and needing to be maintained in time; when V B is more than 0 and less than or equal to a, an alarm message of slight water leakage is sent, and the user side can continue to use. Slight water leakage does not affect normal use, but needs to be overhauled in time, and the possibility of misjudgment of the system needs to be eliminated. Therefore, slight water leakage can be used continuously, and the user experience is not affected. The a and the b are corresponding comparison values of preset water leakage degrees respectively, and the corresponding comparison values can be reasonably selected according to requirements. The calculation of V B is based on the product of the water level drop height H B (i.e. the difference between the first water level and the second water level) in the water compensating tank 2 and the cross-sectional area S B of the water compensating tank 2. Based on this principle, the water compensating tank 2 of the present invention is preferably an elongated standpipe with a smaller diameter, so that when the water leakage amount is smaller, a larger water level difference can be obtained, and the water leakage detection is more sensitive. The alarm message can be the alarm action of the alarm, and the alarm can be arranged on the user side, so that the alarm can be found out in time.
In a specific embodiment, the water filling piston 12 reciprocates a plurality of times, the first water level corresponds to the water level in the water filling tank 2 corresponding to the first initial position of the water filling piston 12, and the second water level corresponds to the water level in the water filling tank 2 corresponding to the last initial position of the water filling piston 12, so that the difference of the water level change in the water filling tank 2 is more obvious, and the maximum value of each pressing can be reduced by repeated pressing, which is beneficial to protecting the water tank 100.
In some embodiments, the habit of taking hot water by the user is obtained to obtain the use intermittent interval of the water tank 100 (specifically, the habit of using hot water by the user is automatically recorded and learned according to the control module), when the water tank 100 is in the use intermittent interval, a water leakage detection instruction is sent out, so that the disadvantage of taking hot water by the user is prevented, that is, the normal use of hot water by the user is not influenced.
In the process of balancing the water pressure of the water tank 100, the water replenishing tank 2 and the liquid pipe 11, the exhaust pipe 21 is controlled to communicate with the outside to ensure the communicating balancing effect.
Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. A control method of a heat pump system is characterized in that,
The heat pump system includes a water tank leakage detection device (200), the water tank leakage detection device (200) includes:
The water injection assembly is controllably communicated with the water cavity of the water tank (100) through a first pipeline, and water in the water tank (100) can exchange heat with a refrigerant in the first heat exchanger (101) in the heat pump system;
The water supplementing tank (2) is controllably communicated with the first pipeline through a second pipeline, a liquid level detection part (22) is arranged in the water supplementing tank (2), and the water supplementing tank (2) is also provided with an exhaust pipe (21) which can be selectively cut off; the water injection assembly comprises a liquid pipe (11) and a water injection piston (12) inserted into the liquid pipe (11);
The method comprises the following steps:
Acquiring a control instruction;
When the acquired control instruction is a water leakage detection instruction, a water outlet valve of the water tank (100) is controlled to be closed and full of water;
Controlling the water tank (100), the water supplementing tank (2) and the liquid pipe (11) to be communicated, and controlling the second pipeline to be cut off after the water pressure of the water tank (100), the water supplementing tank (2) and the liquid pipe (11) is balanced, wherein the state is used as an initial state of water leakage detection, and in the initial state, the water supplementing tank (2) and the liquid pipe (11) are filled with water, and the water supplementing tank (2) is filled with water;
Controlling the water injection piston (12) to move from an initial position to one side of the water tank (100) by a preset distance so as to enable water in the liquid pipe (11) to enter the water tank (100);
After the water injection piston (12) is located at the preset distance for a first preset time, controlling the water injection piston (12) to retract to the initial position;
Controlling the second pipeline to be communicated and waiting for a second preset time to stabilize the water level in the water supplementing tank (2), and closing the first electromagnetic stop valve (41) and the second electromagnetic stop valve (42) at the moment;
Acquiring water level values corresponding to the initial position in the water supplementing tank (2) for two times, namely a first water level and a second water level;
And obtaining the water leakage state of the water tank (100) according to the difference value between the first water level and the second water level.
2. The control method according to claim 1, wherein obtaining the water leakage state of the water tank (100) from the difference between the first water level and the second water level includes:
Obtaining the descending volume of water in the water supplementing tank (2) as V B according to the first water level and the second water level, closing a water inlet valve of the water tank (100) and sending an alarm message of severe water leakage when b is less than V B and less than or equal to a; when a is more than V B and less than or equal to b, sending out an alarm message of moderate water leakage; when V B is more than 0 and less than or equal to a, an alarm message of slight water leakage is sent out.
3. The control method according to claim 1, wherein,
The water injection piston (12) moves repeatedly, the first water level corresponds to the water level in the water supplementing tank (2) corresponding to the first initial position of the water injection piston (12), and the second water level corresponds to the water level in the water supplementing tank (2) corresponding to the last initial position of the water injection piston (12); and/or the preset distance is the position corresponding to the water pressure in the water tank (100) reaching the maximum allowable pressure.
4. The control method according to claim 1, wherein,
Acquiring a habit of a user for taking hot water so as to acquire a use intermittent interval of the water tank (100), and sending out a water leakage detection instruction when the water tank (100) is positioned in the use intermittent interval; and/or controlling the exhaust pipe (21) to be communicated with the outside in the water pressure balancing process of the water tank (100), the water supplementing tank (2) and the liquid pipe (11).
5. The control method according to claim 1, characterized in that the heat pump system further comprises a first heat exchanger (101) and a compressor (102), wherein an exhaust port of the compressor (102) is communicated with the first heat exchanger (101), and heat exchange is realized between a refrigerant in the first heat exchanger (101) and water in the water tank (100) through a water circulation system.
6. The control method according to claim 1, wherein,
The water leakage detection device of the water tank further comprises a reciprocating driving part, wherein the reciprocating driving part is provided with a permanent magnet at the tail end of the water injection piston (12) and an electromagnetic part which is arranged opposite to the permanent magnet, and the electromagnetic part can repel or adsorb the permanent magnet.
7. The control method according to claim 6, wherein,
And a pressure detection element (3) is arranged between the permanent magnet and the electromagnetic component, and when the real-time pressure detected by the pressure detection element (3) reaches a preset pressure value, the current of the electromagnetic component is kept unchanged.
8. The control method according to any one of claims 1 to 7,
The liquid level detection component (22) is a liquid level sensor; and/or a first electromagnetic stop valve (41) is connected in series on the first pipeline, the connection point of the second pipeline and the first pipeline is a first connection point, and the first electromagnetic stop valve (41) is positioned between the first connection point and the water tank (100); a second electromagnetic stop valve (42) is connected in series on the second pipeline, and a third electromagnetic stop valve (43) is connected in series on the exhaust pipe (21).
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| CN108801562A (en) * | 2018-03-31 | 2018-11-13 | 特变电工新疆新能源股份有限公司 | A kind of flexible direct current transmission converter valve valve tower leakage inspector and method |
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