CN214273913U - Air compressor machine monitoring system and air compressor machine that can remote monitoring - Google Patents
Air compressor machine monitoring system and air compressor machine that can remote monitoring Download PDFInfo
- Publication number
- CN214273913U CN214273913U CN202023332245.4U CN202023332245U CN214273913U CN 214273913 U CN214273913 U CN 214273913U CN 202023332245 U CN202023332245 U CN 202023332245U CN 214273913 U CN214273913 U CN 214273913U
- Authority
- CN
- China
- Prior art keywords
- air compressor
- signal
- sends
- monitoring unit
- module
- 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 discloses an air compressor machine monitoring system and air compressor machine that can remote monitoring, including air compressor machine monitoring unit and remote monitoring unit, three-phase voltage detection module is arranged in the three-phase voltage signal of detection circuit and sends to master control IC, and master control IC is used for judging each phase voltage signal whether unusual, if, master control IC produces first shut-off signal and sends to air compressor machine control circuit, and air compressor machine control circuit closes the controlled air compressor machine according to first shut-off signal; the main control IC is also used for judging whether the difference between any two-phase voltage signals is abnormal, if so, the main control IC generates a second closing signal and sends the second closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the second closing signal. The utility model discloses whether accessible three-phase voltage detection module detects three-phase voltage unusual, if unusual, then in time close by accuse air compressor machine, reduced the risk of air compressor machine motor damage, improved the security.
Description
Technical Field
The utility model relates to an air compressor machine monitoring technology field, concretely relates to but air compressor machine monitoring system and air compressor machine of remote monitoring.
Background
The three-phase three-wire air compressor on the existing market can not detect the conditions such as whether mains voltage is open-phase, whether voltage is on the low side, whether interphase voltage is unbalanced, and these conditions may cause the air compressor motor to damage, produce bigger loss even.
The existing air compressor only comprises a mechanical switch to control the on and off of the air compressor, and cannot be remotely opened and closed, and after a lessee rents the equipment, even if the lessee does not return the air compressor for an extended period, the lessee cannot remotely close the air compressor, so that the benefits of the lessee are damaged. In addition, the maintenance interval time of the conventional three-phase three-wire air compressor is mainly determined according to manual observation, so that the efficiency is low, and the head of the air compressor is damaged or the service life of the air compressor is shortened due to human judgment errors; in addition, the lessor cannot know the position of the renting equipment, and the equipment is lost.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a but air compressor machine monitoring system and air compressor machine of remote monitoring, accessible three-phase voltage detection module detect voltage signal whether unusual, if unusual, then close by accuse air compressor machine, avoid the air compressor machine to receive the damage, improved the security.
In a first aspect, the utility model provides an air compressor monitoring system capable of being remotely monitored, which comprises an air compressor monitoring unit and a remote monitoring unit, wherein the air compressor monitoring unit comprises a three-phase voltage detection module, a master control IC, an air compressor control circuit and an internet of things module, and the internet of things module comprises a communication module; the three-phase voltage detection module is used for detecting three-phase voltage signals in the circuit and sending the three-phase voltage signals to the master control IC, and the master control IC sends the three-phase voltage signals to the remote monitoring unit through the communication module;
the main control IC is also used for judging whether each phase voltage signal is greater than a first preset threshold and smaller than a second preset threshold, if not, the main control IC generates a first closing signal and sends the first closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the first closing signal;
the master control IC is also used for judging whether the difference between any two-phase voltage signals is greater than a third preset threshold and smaller than a fourth preset threshold, if not, the master control IC generates a second closing signal and sends the second closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the second closing signal.
Preferably, the remote monitoring unit comprises a remote control switch, the remote control switch generates a remote control signal according to a monitor instruction and sends the remote control signal to the air compressor control circuit through the communication module and the master control IC in sequence, and the air compressor control circuit block controls the controlled air compressor to be turned on or turned off according to the remote control signal.
Preferably, the air compressor monitoring unit further comprises a working duration detection module for detecting the continuous working duration of the controlled air compressor and sending the continuous working duration to the master control IC, the master control IC sends the continuous working duration to the remote monitoring unit through the communication module, the remote monitoring unit is used for judging whether the continuous working duration is less than a preset working duration, and if not, the remote monitoring unit generates a maintenance signal and sends the maintenance signal to the user terminal of the controlled air compressor.
Preferably, the air compressor monitoring unit further comprises a positioning module, the positioning module is used for detecting the position information of the controlled air compressor and sending the position information to the main control IC, and the main control IC sends the position information to the remote monitoring unit through the communication module.
Preferably, the air compressor monitoring unit further comprises an uncovering detection module, the uncovering detection module is used for detecting uncovering information of the controlled air compressor control box cover and sending the uncovering information to the main control IC, and the main control IC sends the uncovering information to the remote monitoring unit through the communication module.
Preferably, the air compressor monitoring unit further comprises a test button and a status indicator light, the test button generates a test signal according to a user instruction and sends the test signal to the main control IC,
the master control IC generates a first starting signal according to the test signal and sends the first starting signal to the air compressor control circuit, and the air compressor control circuit opens the controlled air compressor according to the first starting signal; after the preset time, the master control IC generates a third closing signal and sends the third closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the third closing signal;
the master control IC generates an indicator light starting signal according to the test signal and sends the indicator light starting signal to the state indicator light; after the preset time, the master control IC generates an indicator light closing signal and sends the indicator light closing signal to the status indicator light.
Preferably, the remote monitoring unit further comprises a timing module and a processor module, the timing module is used for recording the actual rental time of the controlled air compressor and sending the actual rental time to the processor module, the processor module is used for judging whether the actual rental time is less than the preset rental time, if not, the processor module generates a fourth closing signal and sends the fourth closing signal to the air compressor control circuit through the communication module and the main control IC in sequence, and the air compressor control circuit closes the controlled air compressor according to the fourth closing signal.
Preferably, the emergency shutdown module is directly connected with the controlled air compressor and used for shutting down the controlled air compressor.
In a second aspect, an air compressor includes the air compressor monitoring system capable of being remotely monitored according to the first aspect.
The utility model discloses a but air compressor machine monitoring system and air compressor machine of remote monitoring who realizes, accessible three-phase voltage detection module detect three-phase voltage whether unusual, if unusual, then in time close by accuse air compressor machine, reduced the risk of air compressor machine motor damage, improved the security. The taxi service life monitoring system is also provided with a remote control switch and a taxi duration timing module, if the tenant does not return the air compressor in an overdue mode, the taxi can remotely close the controlled air compressor, and benefits of the taxi are guaranteed. The air compressor maintenance control system is further provided with an operating time detection module, when the operating time reaches a fixed period, a user can be prompted to maintain the controlled air compressor, and the service life of the controlled air compressor is effectively prolonged. Still be equipped with orientation module and stand-by battery, make things convenient for remote monitoring controlled air compressor's geographical position. The design of the uncovering detection module can prevent malicious opening or mistaken opening of the control box cover of the controlled air compressor, and improves safety. The test button and the test operation are used for checking whether the air compressor monitoring unit mainboard normally works when the air compressor is delivered, and are also used for a tester to judge whether the controlled air compressor can normally work. The design of the emergency shutdown module can prevent the remote monitoring unit from being incapable of shutting down the controlled air compressor in time through the remote control switch when the controlled air compressor fails, so that the safety is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is the embodiment of the utility model provides an air compressor machine monitoring unit's schematic structure diagram.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
As shown in fig. 1, the utility model provides a but air compressor machine monitoring system of remote monitoring, including air compressor machine monitoring unit and remote monitoring unit, air compressor machine monitoring unit includes three-phase voltage detection module, master control IC, air compressor machine control circuit and thing allies oneself with the module, and the thing allies oneself with the module and adopts NB-IOT CAT.1.
The internet of things module comprises a communication module, the three-phase voltage detection module is used for detecting three-phase voltage signals in the circuit and sending the three-phase voltage signals to the main control IC, and the main control IC sends the three-phase voltage signals to the remote monitoring unit through the communication module; the main control IC is also used for judging whether each phase voltage signal is greater than a first preset threshold and smaller than a second preset threshold, if not, the main control IC generates a first closing signal and sends the first closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the first closing signal; the master control IC is also used for judging whether the difference between any two-phase voltage signals is greater than a third preset threshold and smaller than a fourth preset threshold, if not, the master control IC generates a second closing signal and sends the second closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the second closing signal. The main control IC three-phase voltage signal is compared with the first, second, third and fourth preset threshold values to judge whether the power voltage has abnormal conditions such as phase loss, low voltage, unbalanced phase voltage and the like, and if the abnormal conditions exist, the main control IC closes the controlled air compressor through the air compressor control circuit, so that the risk of damage of the air compressor motor is reduced, and the safety is improved.
The embodiment also comprises a power management module, wherein the power management module comprises an EMC circuit, an AC-DC circuit, a power input detection circuit, a charging and discharging management IC, a DC-DC circuit and a standby battery. The three-phase power input end is connected with the EMC circuit and the power input end of the controlled air compressor, and the power signals supply power to the main control IC after passing through the EMC circuit, the AC-DC circuit and the DC-DC circuit. The power input detection circuit is used for detecting whether the AC-DC circuit has a power signal, if so, the mainboard module is started to work, and if not, the main control IC enters an intermittent sleep mode.
In this embodiment, the remote monitoring unit includes a remote control switch, and the remote control switch is disposed at the mobile phone end of the monitor or at the server background. The remote control switch generates a remote control signal according to an instruction of a monitor and sends the remote control signal to the air compressor control circuit through the communication module and the master control IC, and the air compressor control circuit block controls the controlled air compressor to be turned on or turned off according to the remote control signal. After the air compressor monitoring unit is connected with a three-phase power supply, the master control IC starts to work and establishes a connection relation with the remote monitoring unit through the communication module, communication is started, under the condition that three-phase voltage signals detected by the three-phase voltage detection module are normal, the remote control switch generates remote control signals according to instructions of a monitor and sends the remote control signals to the air compressor control circuit through the communication module and the master control IC in sequence, and the air compressor control circuit block controls the controlled air compressor to be started or closed according to the remote control signals.
The air compressor monitoring unit further comprises a working time length detection module for detecting the continuous working time length of the controlled air compressor and sending the continuous working time length to the master control IC, the master control IC sends the continuous working time length to the remote monitoring unit through the communication module, the remote monitoring unit is used for judging whether the continuous working time length is less than the preset working time length, if not, the remote monitoring unit generates a maintenance signal and sends the maintenance signal to a user terminal of the controlled air compressor, a user is prompted to maintain the controlled air compressor, and the service life of the controlled air compressor is effectively prolonged.
The system comprises a power input detection circuit, a remote monitoring unit, a power supply input detection circuit, a main control IC and a communication module, wherein the power input detection circuit is used for detecting the position information of a controlled air compressor and sending the position information to the main control IC; if the power input detection circuit detects no power signal, the master control IC uploads the position information of the controlled air compressor to the remote monitoring unit through the communication module at regular time. The design of the positioning module facilitates remote monitoring of the geographical position of the controlled air compressor, and loss is prevented. This embodiment has set up backup battery, even under the circumstances of being controlled the air compressor machine outage, also can ensure that air compressor machine monitoring unit constantly uploads the positional information of being controlled the air compressor machine in 15 days. Even if the electric quantity of the standby battery is consumed up, the remote monitoring unit can also judge the geographical position of the controlled air compressor through the position information uploaded at the last time. The standby battery is internally provided with a charging circuit, and the standby battery can start to be charged as long as the air compressor monitoring unit is powered on, so that the standby battery is ensured to be in a full-power state all the time.
The air compressor machine monitoring unit still includes the detection module that uncaps, and the detection module that uncaps is used for detecting the information of uncapping of controlled air compressor machine control lid and sends to master control IC, and master control IC sends the information of uncapping to the remote monitoring unit through communication module, and the remote monitoring unit record time of uncapping can prevent to open maliciously or the mistake opens the control lid of controlled air compressor machine, has improved the security.
The air compressor monitoring unit further comprises a test button and a state indicator light, the test button generates a test signal according to a user instruction and sends the test signal to the master control IC, the master control IC generates a first starting signal according to the test signal and sends the first starting signal to the air compressor control circuit, and the air compressor control circuit opens the controlled air compressor according to the first starting signal; after the preset time, the master control IC generates a third closing signal and sends the third closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the third closing signal; the master control IC generates an indicator light starting signal according to the test signal and sends the indicator light starting signal to the state indicator light; after the preset time, the master control IC generates an indicator light closing signal and sends the indicator light closing signal to the status indicator light. In this embodiment, the preset time is 3 seconds, and after pressing the test button, the air compressor machine becomes the on-state by the off-state, and the status indicator light shines and shows simultaneously, and 3 seconds later, the air compressor machine becomes off-state status indicator light by the on-state and extinguishes. The test button and the test operation are used for checking whether the air compressor monitoring unit mainboard normally works when the air compressor is delivered, and are also used for a tester to judge whether the controlled air compressor can normally work.
The remote monitoring unit further comprises a timing module and a processor module, the timing module is used for recording the renting time of the controlled air compressor and sending the renting time to the processor module, the processor module is used for judging whether the renting time is less than the preset renting time, if not, the processor module generates a fourth closing signal and sends the fourth closing signal to the air compressor control circuit through the communication module and the main control IC, and the air compressor control circuit closes the controlled air compressor according to the fourth closing signal. After the lessor rents the equipment, if the tenant does not return the air compressor for the time being, the lessor can remotely close the controlled air compressor, and the benefits of the lessor are guaranteed.
In this implementation, still include the emergency shutdown module, with controlled air compressor machine lug connection for close by the accuse air compressor machine, when can preventing by the trouble of accuse air compressor machine, remote monitoring unit can not in time close by the remote control switch by the accuse air compressor machine, has improved the security.
Based on the same inventive concept, the embodiment of the utility model provides a still provides an air compressor machine, but including the above air compressor machine monitoring system of remote monitoring.
The embodiment of the utility model provides a but air compressor machine monitoring system and air compressor machine of remote monitoring who realizes, accessible three-phase voltage detection module detect three-phase voltage whether unusual, if unusual, then in time close by the accuse air compressor machine, reduced the risk of air compressor machine motor damage, improved the security. The embodiment is also provided with a remote control switch and a leasing time timing module, if the tenant does not return the air compressor in an overdue mode, the lessor can remotely close the controlled air compressor, and benefits of the lessor are guaranteed. This embodiment still is equipped with operating duration detection module, and when operating duration reached a regular time limit, can indicate the user to maintain by accuse air compressor machine, effectively prolongs the life of by accuse air compressor machine. This embodiment still is equipped with orientation module and stand-by battery, makes things convenient for the geographical position of remote monitoring controlled air compressor machine. The design of the uncovering detection module can prevent malicious opening or mistaken opening of the control box cover of the controlled air compressor, and improves safety. The test button and the test operation are used for checking whether the air compressor monitoring unit mainboard normally works when the air compressor is delivered, and are also used for a tester to judge whether the controlled air compressor can normally work. The design of the emergency shutdown module can prevent the remote monitoring unit from being incapable of shutting down the controlled air compressor in time through the remote control switch when the controlled air compressor fails, so that the safety is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (9)
1. The utility model provides a but remote monitoring's air compressor machine monitoring system, includes air compressor machine monitoring unit and remote monitoring unit, its characterized in that: the air compressor monitoring unit comprises a three-phase voltage detection module, a master control IC, an air compressor control circuit and an internet of things module, and the internet of things module comprises a communication module; the three-phase voltage detection module is used for detecting three-phase voltage signals in the circuit and sending the three-phase voltage signals to the master control IC, and the master control IC sends the three-phase voltage signals to the remote monitoring unit through the communication module;
the main control IC is also used for judging whether each phase voltage signal is greater than a first preset threshold and smaller than a second preset threshold, if not, the main control IC generates a first closing signal and sends the first closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the first closing signal;
the master control IC is also used for judging whether the difference between any two-phase voltage signals is greater than a third preset threshold and smaller than a fourth preset threshold, if not, the master control IC generates a second closing signal and sends the second closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the second closing signal.
2. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the remote monitoring unit comprises a remote control switch, the remote control switch generates a remote control signal according to a monitor instruction and sends the remote control signal to the air compressor control circuit through the communication module and the master control IC in sequence, and the air compressor control circuit block controls the controlled air compressor to be turned on or turned off according to the remote control signal.
3. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the air compressor monitoring unit further comprises a working time length detection module for detecting the continuous working time length of the controlled air compressor and sending the continuous working time length to the master control IC, the master control IC sends the continuous working time length to the remote monitoring unit through the communication module, the remote monitoring unit is used for judging whether the continuous working time length is less than the preset working time length, and if not, the remote monitoring unit generates a maintenance signal and sends the maintenance signal to a user terminal of the controlled air compressor.
4. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the Internet of things module further comprises a positioning module, the positioning module is used for detecting the position information of the controlled air compressor and sending the position information to the master control IC, and the master control IC sends the position information to the remote monitoring unit through the communication module.
5. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the air compressor monitoring unit further comprises an uncovering detection module, the uncovering detection module is used for detecting uncovering information of the controlled air compressor control box cover and sending the uncovering information to the main control IC, and the main control IC sends the uncovering information to the remote monitoring unit through the communication module.
6. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the air compressor monitoring unit also comprises a test button and a status indicator light, the test button generates a test signal according to a user instruction and sends the test signal to the main control IC,
the master control IC generates a first starting signal according to the test signal and sends the first starting signal to the air compressor control circuit, and the air compressor control circuit opens the controlled air compressor according to the first starting signal; after the preset time, the master control IC generates a third closing signal and sends the third closing signal to the air compressor control circuit, and the air compressor control circuit closes the controlled air compressor according to the third closing signal;
the master control IC generates an indicator light starting signal according to the test signal and sends the indicator light starting signal to the state indicator light; after the preset time, the master control IC generates an indicator light closing signal and sends the indicator light closing signal to the status indicator light.
7. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: the remote monitoring unit further comprises a timing module and a processor module, the timing module is used for recording the actual renting time of the controlled air compressor and sending the actual renting time to the processor module, the processor module is used for judging whether the actual renting time is less than the preset renting time, if not, the processor module generates a fourth closing signal and sends the fourth closing signal to the air compressor control circuit through the communication module and the main control IC, and the air compressor control circuit closes the controlled air compressor according to the fourth closing signal.
8. The air compressor monitoring system capable of being remotely monitored according to claim 1, is characterized in that: still include the emergency shutdown module, with being controlled air compressor direct connection for close by the accuse air compressor machine.
9. The utility model provides an air compressor machine which characterized in that: the remotely monitorable air compressor monitoring system including any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023332245.4U CN214273913U (en) | 2020-12-30 | 2020-12-30 | Air compressor machine monitoring system and air compressor machine that can remote monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023332245.4U CN214273913U (en) | 2020-12-30 | 2020-12-30 | Air compressor machine monitoring system and air compressor machine that can remote monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214273913U true CN214273913U (en) | 2021-09-24 |
Family
ID=77786933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023332245.4U Active CN214273913U (en) | 2020-12-30 | 2020-12-30 | Air compressor machine monitoring system and air compressor machine that can remote monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214273913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112447A (en) * | 2021-11-24 | 2022-03-01 | 中车大连机车车辆有限公司 | Method for testing functions of locomotive before departure |
-
2020
- 2020-12-30 CN CN202023332245.4U patent/CN214273913U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112447A (en) * | 2021-11-24 | 2022-03-01 | 中车大连机车车辆有限公司 | Method for testing functions of locomotive before departure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102156679B (en) | PCIE interface-based solid state disk power-down protection method and device | |
| RU2627735C2 (en) | System and device for providing power supply of network peripheral device and work method of such system and device | |
| CN211208607U (en) | Monitoring device for battery management system and battery management system | |
| CN205450758U (en) | Novel generator set controller suitable for long -range failure diagnosis | |
| CN105468127A (en) | Real-time data acquisition system and power failure data saving circuit and method thereof | |
| CN202013570U (en) | Power down protecting device for solid state disk based on PCIE (Peripheral Component Interface Express) interface | |
| CN116011993B (en) | Storage battery health management system based on CPS architecture | |
| CN110571884A (en) | direct-current charger with online monitoring function of discharge loop and online monitoring method of discharge loop | |
| CN214273913U (en) | Air compressor machine monitoring system and air compressor machine that can remote monitoring | |
| CN101587972B (en) | Double cell control method | |
| CN210570872U (en) | Gas meter with power-on self-checking function | |
| CN106877442A (en) | Battery management method and system | |
| CN110837062A (en) | Power failure and network failure detection reporting system | |
| CN110611353A (en) | Charging control method and device of intelligent door lock and intelligent door lock | |
| JP5570897B2 (en) | Terminal network control device and telemeter system | |
| CN101895138A (en) | Method and system for storage battery management | |
| CN112610460A (en) | Air compressor machine monitoring system and air compressor machine that can remote monitoring | |
| CN111682600A (en) | Internet of things charging cabinet capable of detecting abnormity of electric bicycle lithium battery | |
| CN111525644A (en) | Battery management system and battery management method | |
| CN111061200A (en) | Power environment monitoring device with storage battery management | |
| CN107104506A (en) | A kind of emergency power generation automatic switching system | |
| CN206922500U (en) | A kind of emergency power generation automatic switching system | |
| CN207530860U (en) | 5T acquisition station condition monitoring early warning and maintenance auxiliary system | |
| CN107274521B (en) | Safety control device for security | |
| CN206903920U (en) | Water pump protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |