CN215340841U - Water supply monitoring system - Google Patents
Water supply monitoring system Download PDFInfo
- Publication number
- CN215340841U CN215340841U CN202121481232.5U CN202121481232U CN215340841U CN 215340841 U CN215340841 U CN 215340841U CN 202121481232 U CN202121481232 U CN 202121481232U CN 215340841 U CN215340841 U CN 215340841U
- Authority
- CN
- China
- Prior art keywords
- switch
- water
- alternating current
- water level
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a water supply monitoring system, which comprises a PLC (programmable logic controller), a water level detection device, an alarm device and a communication module, wherein the water level detection device, the alarm device and the communication module are electrically connected with the PLC; the water level detection device is arranged on the inner wall of the water pool, is connected to a signal input port of the PLC, and transmits a water level reduction signal to the PLC; the alarm device is connected to an alarm signal output port of the PLC; the PLC receives the water level reduction signal, transmits the water level reduction signal to a remote monitoring platform through the communication module, generates a water level alarm signal and transmits the water level alarm signal to an alarm device; and the alarm device receives the water level alarm signal to alarm. The water supply monitoring system can monitor the water level of the water tank, and when the water level of the water tank is low, the alarm device can give an alarm, so that workers can manage the water supply system in time and store water in time, and the production water of the whole plant is prevented from being influenced due to less stored water.
Description
Technical Field
The utility model relates to the technical field of water supply monitoring, in particular to a water supply monitoring system.
Background
The water pump room of shipyard mainly used manages the life process water of whole factory, and the water pump room is provided with tank, a plurality of water pumps, switch board and automatic control system. Generally, the duty room is arranged at a position about several kilometers away from the water pump room, and a duty worker of the water pump room observes the water level of a water tank of the water pump room, the water inlet pressure, the current of a water pump motor and the running conditions of all water pumps in a patrol mode and controls the water storage capacity of the water tank by manually adjusting the opening of a water inlet valve according to the water level conditions of the water tank. However, when the ship rust removal operation is performed, the ultrahigh pressure water pump needs to be adopted for pumping water for rust removal, a large amount of tap water is needed, or when the water flow is lost due to reasons such as bursting of tap water pipes outside the field, if the person on duty cannot find the water flow in time, the person cannot go to the water pump room in time to manually adjust the water valve opening of the municipal water inlet pipe, the water level of the water tank is rapidly reduced, the water storage capacity in the water tank cannot meet the production water of the whole factory, and the shipyard is forced to stop water in serious cases, so that the production progress of the shipyard is greatly influenced.
It can be seen that the mode that the former pump house was managed is looked over through artifical patrol intelligent not enough, when the sudden increase of emergency water consumption, can't in time look over the pond water level, can't in time impound.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims to overcome the defects and shortcomings in the prior art, and provides a water supply monitoring system which can remotely monitor the water level of a water pool of a water pump room, is convenient for controlling each water pump and prevents the situation of insufficient water storage of the water pool.
The water supply monitoring system comprises a PLC controller, a water level detection device, an alarm device and a communication module, wherein the water level detection device, the alarm device and the communication module are electrically connected with the PLC controller; the water level detection device is arranged on the inner wall of the water pool, is connected to a signal input port of the PLC, and transmits a water level reduction signal to the PLC; the alarm device is connected to an alarm signal output port of the PLC; the PLC receives the water level reduction signal, transmits the water level reduction signal to a remote monitoring platform through the communication module, generates a water level alarm signal and transmits the water level alarm signal to an alarm device; and the alarm device receives the water level alarm signal to alarm.
The water supply monitoring system can monitor the water level of the water tank, when the water level of the water tank is low, the alarm device can give an alarm, and meanwhile, the water level reduction signal is sent to the remote monitoring platform through the communication module, so that workers can manage the water supply system in time, water is stored in time, and the production water of the whole plant is prevented from being influenced due to less water storage.
The water inlet pipeline is provided with a first water pressure detection device; the first water pressure detection device is electrically connected with the PLC and transmits a water inlet pressure signal to the PLC.
The system further comprises a plurality of water pumps, and a soft starter and an alternating current contactor which are arranged in one-to-one correspondence with the water pumps; the alternating current contactor comprises an alternating current coil and a contactor switch; the soft starter comprises a first starting switch; the water pump is arranged between the water inlet pipeline and the water inlet of the water pool, and a power supply end of a motor of the water pump is connected to an alternating current power supply through a corresponding contactor switch of the alternating current contactor; and an alternating current coil of the alternating current contactor is connected to an alternating current power supply through a first starting switch of the soft starter.
Further, the device also comprises a breaker; the circuit breaker is connected between the live wire of the alternating current power supply and the contactor switch of the alternating current contactor.
Further, the system also comprises a main switch and a first relay; the first relay comprises a first coil and a first switch; one end of the first coil is connected with a zero line of an alternating current power supply, and the other end of the first coil is connected to a live wire of the alternating current power supply through the main switch; the first starting switch of the soft starter is connected to a live wire of an alternating current power supply through the first switch of the first relay and the main switch.
Further, the device also comprises a thermal protection relay; the thermal protection relay comprises a thermal protection coil and a thermal protection switch FR 1-1; a power supply end of a motor of the water pump is connected to a contactor switch of the alternating current contactor through a thermal protection coil of the thermal protection relay; one end of a thermal protection switch FR1-1 of the thermal protection relay is connected to a zero line of an alternating current power supply, and the other end of the thermal protection relay is connected to a live line of the alternating current power supply through an alternating current coil of the alternating current contactor, a first starting switch of the soft starter, a first switch of the first relay and the main switch.
Further, a second relay is also included; the second relay comprises a second coil, a second switch and a third switch; the second coil is connected between the first switch and a zero line of an alternating current power supply; the second switch is connected between a signal input port of the soft starter and an auxiliary power supply; the third switch is connected between a signal input port of the PLC controller and an auxiliary power supply.
Further, a third relay is also included, the third relay including a third coil and a fourth switch; the soft starter comprises a second starting switch; and the third coil of the third relay is connected to a live wire of an alternating current power supply through the second starting switch of the soft starter, and the fourth switch is connected between the first starting switch and the first switch of the soft starter.
For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a block diagram of a feedwater monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the connections of the control module according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of a water pump according to an embodiment of the present invention;
fig. 4 is a schematic connection diagram of a water pump driving circuit according to an embodiment of the utility model.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if/if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
This water supply monitoring system can monitor the pond water level, and when the pond water level was lower, accessible alarm device sent the warning, and accessible communication module reduces signal transmission to remote monitoring platform with the water level to the staff in time manages water supply system, and the production water of whole factory is prevented to influence because the water storage is less. In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a block diagram of a water supply monitoring system according to an embodiment of the present invention; fig. 2 is a schematic connection diagram of the control module according to an embodiment of the present invention.
The water supply monitoring system comprises a control module 1, and a water level detection device 2 and an alarm device 3 which are electrically connected with the control module 1; the control module 1 comprises a PLC (programmable logic controller) 11 and a communication module 12; the water level detection device 2 is arranged on the inner wall of the water pool, the water level detection device 2 is connected to a signal input port of the PLC controller 11, and a water level reduction signal is transmitted to the PLC controller 11; the alarm device 3 is arranged in a management duty room of the water supply system, and the alarm device 3 is connected to an alarm signal output port of the PLC 11; the PLC 11 receives the water level lowering signal, generates a water level alarm signal and transmits the water level alarm signal to the alarm device 3, and the alarm device 3 receives the water level alarm signal and gives an alarm. The PLC controller 11 receives the water level reduction signal and then transmits the water level reduction signal to a remote monitoring platform through a communication module 12, so that an operator on duty can check the water level reduction signal through terminal equipment such as a smart phone conveniently. The communication module 12 may be a wireless communication module or a wired communication module.
This water supply monitoring system detects the water storage in the pond through water level detection device, when the water storage is less, send the lower signal of water level to control module, output alarm signal to alarm device through control module, send out the police dispatch newspaper through the warning bagging, and send the water level reduction signal to remote monitoring platform through communication module, the staff of the room on duty of being convenient for can in time discover the pond water level decline, and open the water pump in time and to the quick water injection in the pond, compare in the method that the staff on duty patrolled and look over the pond water level, water supply monitoring system is comparatively intelligent in this application, high durability and convenient use.
In this embodiment, the PLC controller 11 and the communication module 12 are integrated on the same control module 1, so as to reduce the connections between the modules and also reduce the cost. In addition, the PLC controller 11 and the communication module 12 may be independent modules or devices. In this embodiment, the water level detecting device 2 is connected to a signal input port of the PLC controller 11, and transmits a water level lowering signal to the PLC controller 11; PLC controller 11 receives the water level reduction signal generates water level alarm signal and passes through wireless communication module 12 transmits to remote monitoring platform, and the person on duty of being convenient for looks over the pond water level condition through remote intelligent terminal, anytime and anywhere like monitoring platform, smart mobile phone etc..
Specifically, water level detection device 2 can be water level sensor, and water level sensor connects between auxiliary power supply and the signal input port of PLC controller, and when water level sensor detected that the pond water level dropped to a take the altitude, with auxiliary power supply's voltage signal transmission to PLC controller 11, PLC controller 11 of being convenient for sent alarm signal to alarm device 3's water level alarm. The auxiliary power supply may be a +24V dc power supply.
In order to be able to check whether the water inlet pipe is normally filled with water or not, a water pressure detection device 4 is further arranged on the water inlet pipe, and the water pressure detection device 4 is electrically connected with the PLC controller 11 and transmits a water inlet pressure signal to the PLC controller 11.
Specifically, water pressure detection device 4 can be water level sensor, and water pressure sensor connects between auxiliary power supply and PLC controller 11's signal input port, and when water pressure sensor detected water pressure on the inlet channel and was less than the preset pressure value, with auxiliary power supply's voltage signal transmission to PLC controller 11, PLC controller 11 of being convenient for sent alarm signal to alarm device 3's the water pressure alarm of intaking.
In order to timely store water in the water tank, a plurality of water pumps and related control circuits are further arranged in the water storage tank. Referring to fig. 3 and 4, fig. 3 is a schematic connection diagram of a water pump according to an embodiment of the present invention; fig. 4 is a schematic connection diagram of a water pump driving circuit according to an embodiment of the utility model.
Specifically, the water supply monitoring system further comprises a plurality of water pumps 5, and a soft starter 6 and an alternating current contactor 9 which are arranged in one-to-one correspondence with the water pumps 5; the alternating current contactor 9 comprises an alternating current coil KM1 and a contactor switch KM1-1, wherein the contactor switch KM1-1 is controlled by the linkage of an alternating current coil KM 1; the soft-starter 6 comprises a first start switch (R2A-R2C); the water pump 5 is arranged between the water inlet pipeline and the water inlet of the pool, and a power supply end of a motor of the water pump 5 is connected to a live wire of an alternating current power supply through a corresponding contactor switch KM1-1 of the alternating current contactor 9; the ac coil KM1 of the ac contactor 9 is connected to the line of the ac power source through the first start switch (R2A-R2C) of the soft starter 6.
In this embodiment, can control the motor of water pump 5 through soft starter 6 and ac contactor 9, when soft starter 6 got the electricity and normally starts, first starting switch (R2A-R2C) were closed, made ac coil KM1 get the electricity and triggered contactor switch KM1-1 and closed to the live wire that makes the power end of the motor of water pump 5 be connected to ac power supply gets the electricity and starts, and pump water impounds in the pond, prevents that the pond water level from descending. In this embodiment, the specific types of the soft starter 6 and the ac contactor 9 are not limited.
In an alternative embodiment, a better control of the water pump 5 is achieved. The water supply monitoring system also comprises a main switch SA1 and a first relay; the first relay comprises a first coil KA1 and a first switch KA1-1, and the first switch KA1-1 is under the linkage control of the first coil KA 1; one end of the first coil KA1 is connected with a zero line of an alternating current power supply, and the other end of the first coil KA1 is connected with a live line of the alternating current power supply through the main switch SA 1; the first starting switch (R2A-R2C) of the soft starter 6 is connected to the live wire of the alternating current power supply through the first switch KA1-1 of the first relay and the main switch SA 1. When the main switch SA1 is closed, the first coil KA1 of the first relay is electrified to trigger the first switch KA1-1 to be closed, at the moment, the first starting switch (R2A-R2C) of the soft starter 6 is also electrified to enable the alternating current coil KM1 of the alternating current contactor 9 to be electrified, and the trigger contactor switch KM1-1 is electrified to be closed, so that the power end of the motor of the water pump is connected to the live wire of the alternating current power supply.
In an alternative embodiment, a circuit breaker 7 is also provided in the feedwater monitoring system in order to protect the motor of the water pump 5, as well as the pump control circuit. The circuit breaker 7 is connected between a live wire of an alternating current power supply and a contactor switch KM1-1 of the alternating current contactor 9, when the motor of the water pump 5 is abnormal, or when a water pump control circuit is abnormal, the soft starter 6, the alternating current contactor 9 and the power supply of the motor of the water pump 5 can be disconnected through the circuit breaker 7 to realize corresponding protection.
In an optional embodiment, in order to prevent the motor of the water pump from generating excessive heat to cause damage, the water supply monitoring system further comprises a thermal protection relay 8; the thermal protection relay 8 comprises a thermal protection coil FR1 and a thermal protection switch FR1-1, and the thermal protection switch FR1-1 is controlled by the linkage of a thermal protection coil FR 1; the power supply end of the motor of the water pump is connected to a contactor switch KM1-1 of the alternating current contactor 9 through a thermal protection coil FR1 of the thermal protection relay 8; one end of a thermal protection switch FR1-1 of the thermal protection relay 8 is connected to a zero line of an alternating current power supply, and the other end is connected to a live line of the alternating current power supply through an alternating current coil KM1 of the alternating current contactor 9, a first starting switch (R2A-R2C) of the soft starter 6, a first switch KA1-1 of the first relay, and the main switch SA 1. When the motor of the water pump is overheated, the thermal protection coil FR1 continuously heats until deforming, and triggers the thermal protection switch FR1-1 to be switched off, so that the alternating current coil of the alternating current contactor 9 loses power, and the power supply of the motor of the water pump is switched off to realize overheating protection.
In an optional embodiment, in order to feed back the operation condition of the water pump to the PLC controller, which is convenient for the PLC controller to send the operation condition of the water pump to the remote monitoring platform, the water pump control circuit further includes a second relay; the second relay comprises a second coil KA2, a second switch KA2-1 and a third switch KA2-2, and all the switches of the second relay are controlled by the linkage of the second coil; the second coil KA2 is connected between the first switch KA1-1 and a zero line of an alternating current power supply; the second switch KA2-1 is connected between a signal input port L0+ of the soft starter 6 and an auxiliary power supply; the third switch KA2-2 is connected between the signal input port a1 of the PLC controller 11 and an auxiliary power supply. When the motor of the water pump 5 is connected to a live wire of an alternating current power supply, the second coil KA2 is electrified to trigger the second switch KA2-1 to be closed, the third switch KA2-2 is triggered to be closed, the auxiliary power supply is input into the signal input port A1 of the PLC 11, and therefore the PLC 11 can conveniently transmit a water pump operation signal to the remote monitoring platform through the wireless communication module 12.
In an alternative embodiment, in order to be able to cut off the power supply of soft-starter 6 in case of a failure of soft-starter 6. The water pump control circuit further comprises a third relay, the third relay comprises a third coil KA3 and a fourth switch KA3-1, and each switch of the third relay is controlled by the linkage of the third coil; the soft starter comprises a second starting switch (R1A-R1C); the third coil KA3 of the third relay is connected to the live wire of the AC power supply through the second starting switch (R1A-R1C) of the soft starter 6, and the fourth switch KA3-1 is connected between the first starting switch (R2A-R2C) and the first switch KA1-1 of the soft starter 6. When the soft starter 6 has a fault, the second starting switch (R1A-R1C) is switched off, so that the third coil KA3 is de-energized, and the fourth switch KA3-1 is triggered to be switched off, so that the power supply of the motor of the water pump 5 is cut off, and the protection effect is achieved.
In an alternative embodiment, the second relay further comprises a fifth switch KA2-3, the fifth switch KA2-3 is controlled by the linkage of a second coil KA2 of the second relay, wherein the first switch KA1-1 is connected to the live wire of the alternating current power supply through a water pump start button SB2, a water pump stop button SB1, and the fifth switch KA2-3 is connected to the two ends of the water pump start button SB2 in parallel. When the second coil KA2 of the second relay is powered up at the moment when the water pump starting button SB2 is pressed down, the fifth switch KA2-3 continuously supplies power to the water pump 5, and the water pump starting button SB2 can be released.
The water supply monitoring system can monitor the water level of the water tank, and when the water level of the water tank is low, the alarm device can give an alarm, so that workers can manage the water supply system in time and store water in time, and the production water of the whole plant is prevented from being influenced due to less stored water. Furthermore, the pressure of the water inlet pipeline and the running condition of the water pump can be detected, and a water level descending signal, a water pipe pressure signal and a water pump running signal are sent to the remote monitoring platform, so that the operator on duty can remotely check the running condition of the water supply system, and the management is facilitated.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. A feedwater monitoring system characterized by: the water level detection device comprises a PLC controller, and a water level detection device, an alarm device and a communication module which are electrically connected with the PLC controller; the water level detection device is arranged on the inner wall of the water pool, is connected to a signal input port of the PLC, and transmits a water level reduction signal to the PLC; the alarm device is connected to an alarm signal output port of the PLC; the PLC receives the water level reduction signal, transmits the water level reduction signal to a remote monitoring platform through the communication module, generates a water level alarm signal and transmits the water level alarm signal to an alarm device; and the alarm device receives the water level alarm signal to alarm.
2. The feedwater monitoring system of claim 1 wherein: the water pressure detection device is arranged on the water inlet pipeline; the water pressure detection device is electrically connected with the PLC and transmits a water inlet pressure signal to the PLC.
3. The feedwater monitoring system of claim 1 wherein: the system also comprises a plurality of water pumps, and a soft starter and an alternating current contactor which are arranged in one-to-one correspondence with the water pumps; the alternating current contactor comprises an alternating current coil and a contactor switch; the soft starter comprises a first starting switch; the water pump is arranged between the water inlet pipeline and the water inlet of the water pool, and a power supply end of a motor of the water pump is connected to an alternating current power supply through a corresponding contactor switch of the alternating current contactor; and an alternating current coil of the alternating current contactor is connected to an alternating current power supply through a first starting switch of the soft starter.
4. The feedwater monitoring system of claim 3 wherein: the circuit breaker is also included; the circuit breaker is connected between the live wire of the alternating current power supply and the contactor switch of the alternating current contactor.
5. The feedwater monitoring system of claim 3 wherein: the system also comprises a main switch and a first relay; the first relay comprises a first coil and a first switch; one end of the first coil is connected with a zero line of an alternating current power supply, and the other end of the first coil is connected to a live wire of the alternating current power supply through the main switch; the first starting switch of the soft starter is connected to a live wire of an alternating current power supply through the first switch of the first relay and the main switch.
6. The feedwater monitoring system of claim 5 wherein: the thermal protection relay is also included; the thermal protection relay comprises a thermal protection coil and a thermal protection switch; a power supply end of a motor of the water pump is connected to a contactor switch of the alternating current contactor through a thermal protection coil of the thermal protection relay; one end of a thermal protection switch of the thermal protection relay is connected to a zero line of an alternating current power supply, and the other end of the thermal protection relay is connected to a live wire of the alternating current power supply through an alternating current coil of the alternating current contactor, a first starting switch of the soft starter, a first switch of the first relay and the main switch.
7. The feedwater monitoring system of claim 5 wherein: the device also comprises a second relay; the second relay comprises a second coil, a second switch and a third switch; the second coil is connected between the first switch and a zero line of an alternating current power supply; the second switch is connected between a signal input port of the soft starter and an auxiliary power supply; the third switch is connected between a signal input port of the PLC controller and an auxiliary power supply.
8. The feedwater monitoring system of claim 5 wherein: the third relay comprises a third coil and a fourth switch; the soft starter comprises a second starting switch; and the third coil of the third relay is connected to a live wire of an alternating current power supply through the second starting switch of the soft starter, and the fourth switch is connected between the first starting switch and the first switch of the soft starter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481232.5U CN215340841U (en) | 2021-06-30 | 2021-06-30 | Water supply monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481232.5U CN215340841U (en) | 2021-06-30 | 2021-06-30 | Water supply monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215340841U true CN215340841U (en) | 2021-12-28 |
Family
ID=79563776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121481232.5U Active CN215340841U (en) | 2021-06-30 | 2021-06-30 | Water supply monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215340841U (en) |
-
2021
- 2021-06-30 CN CN202121481232.5U patent/CN215340841U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2011137853A1 (en) | System and method for supplying hydrogen and hydrogen fuel cell system | |
| CN104846934A (en) | Intelligent emergency water supply system | |
| CN102591314B (en) | Centralized oxygen supply system and control method | |
| CN206422556U (en) | A kind of unmanned boat intelligent power | |
| CN215340841U (en) | Water supply monitoring system | |
| CN207315344U (en) | A kind of intelligent start-stop well control systems based on oil well indicator card | |
| CN207019210U (en) | The emergent refrigerating plant of air-conditioning system and air-conditioning system | |
| CN105544646B (en) | A kind of flexible switching system of indoor multi-water resources and method based on water pressure conditions | |
| CN215952706U (en) | Automatic ponding monitoring regular inspection system based on Internet of things | |
| CN114396097B (en) | Intelligent water supply system | |
| CN203783935U (en) | Automatic early warning device for pump station | |
| CN2521262Y (en) | Automatic adding air & supplying water apparatus for bag type expansion water tank | |
| CN206001242U (en) | A kind of control system of Lubricating-oil Station | |
| CN204959876U (en) | A water supply installation for supply room disinfection pot | |
| CN113653133B (en) | Water supply monitoring system | |
| CN201421213Y (en) | Pipeline evacuating and water saving system of solar water heater | |
| CN114253188A (en) | Control system and method for rural sewage treatment equipment | |
| CN103486099B (en) | Grate cooler standby pump interlock and controlling method thereof | |
| KR200206236Y1 (en) | Remote water level regulator and circuit thereby | |
| CN105288912A (en) | Water injection device and water injection method used for fire fighting truck | |
| CN218761732U (en) | Pneumatic actuator for controlling gas through 4G network | |
| CN204219665U (en) | A kind of water filling device for fire fighting truck | |
| CN219829072U (en) | Hydraulic alarm response device of air conditioning system | |
| CN211577748U (en) | Automatic water-replenishing alarm protection device for environmental experiment box | |
| CN215292787U (en) | Emergency starting device of diesel oil water supply pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |