CN209947566U - Varistor with self-checking function and surge protector thereof - Google Patents
Varistor with self-checking function and surge protector thereof Download PDFInfo
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- CN209947566U CN209947566U CN201921151582.8U CN201921151582U CN209947566U CN 209947566 U CN209947566 U CN 209947566U CN 201921151582 U CN201921151582 U CN 201921151582U CN 209947566 U CN209947566 U CN 209947566U
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Abstract
The utility model relates to the technical field of protective electrical appliances, in particular to a piezoresistor with self-checking function and a surge protector thereof, wherein the piezoresistor with self-checking function comprises a piezoresistor body and at least one color-changing body, the color-changing body is connected with the piezoresistor body in a heat conduction way, the color-changing body changes color with temperature sensing and marks the temperature condition of the piezoresistor body, so that when the temperature of the piezoresistor changes, the color of the color-changing body changes, the self-checking function of the piezoresistor is realized, a worker can judge the thermal damage condition of the piezoresistor according to the color change condition of the color-changing body, the piezoresistor after thermal damage is timely replaced, the normal use of the surge protector adopting the piezoresistor with self-checking function is ensured, the circuit is timely cut off, the function of temperature control protection is achieved, and the defect that the prior art adopts machinery to realize fault indication is overcome, the fault rate is lower, has improved surge protector's safety in utilization.
Description
Technical Field
The utility model relates to a protection electrical apparatus technical field, in particular to take self-checking function's piezo-resistor and surge protector thereof.
Background
The piezoresistor is a resistor device with nonlinear volt-ampere characteristics, is often used as an overvoltage protection device, and when the piezoresistor bears overvoltage energy, the temperature of the piezoresistor continuously rises, and reaches the bearing limit of the piezoresistor, the piezoresistor is subjected to thermal damage failure, and can continue to play a role in protection after being replaced.
However, the existing piezoresistor itself cannot display the thermal damage condition, so that after the piezoresistor is thermally damaged, a user cannot find and replace the piezoresistor in time, and the protection of a sensitive device adopting the piezoresistor is affected.
The conventional surge protector is generally provided with a piezoresistor, and the conventional surge protector is generally used for indicating a fault signal through a heat release mechanism of a mechanical structure, wherein the heat release mechanism exerts pressure on a conductive plate and a heating chip which are welded through a welding flux, so that when the heating chip generates heat and the welding flux between the heating chip and the conductive plate is melted, the heating chip is separated from the conductive plate, and the fault signal is indicated through the movement of an elastic push rod assembly of the mechanical structure.
However, because the current-conducting plate and the heating chip lead-out pin are affected by factors such as soldering tin wire drawing adhesion, the situation of incomplete separation is easy to occur, so that the fault cannot be accurately and timely indicated by the elastic push rod assembly of the mechanical structure in the surge protector, and if the piezoresistor damaged by heat cannot be timely replaced, the surge protector is easy to damage and is easy to cause safety accidents such as fire disasters.
Therefore, a piezoresistor and a surge protector capable of accurately and timely displaying thermal damage conditions need to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior piezoresistor and the surge protector, the piezoresistor with the self-checking function and the surge protector thereof are provided.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a take piezo-resistor of self-checking function, includes piezo-resistor body and at least one discolour body, discolour body with piezo-resistor body heat conduction is connected, discolour body temperature sensing discolours, marks the temperature condition of piezo-resistor body.
The utility model discloses a take self-checking function's piezo-resistor has the discoloring body of temperature sensing discoloring function and is connected with piezo-resistor heat conduction through the setting for when piezo-resistor's temperature variation, the discoloring body colour changes, realizes piezo-resistor's self-checking function, makes the staff judge the condition that piezo-resistor thermal destruction according to the situation of change of discoloring body colour, realizes the timely change to the piezo-resistor after the thermal destruction, realizes the protection to the sensitive device of the piezo-resistor who adopts this structure.
As a preferred embodiment of the present invention, the color-changing body includes a temperature-sensitive color-changing material coating. The temperature-sensitive color-changing material coating is formed in a printing or coating mode to serve as the color-changing body, so that the color-changing body is easy to set, the preparation of the piezoresistor with the structure is convenient, when the piezoresistor generates heat, the color of the temperature-sensitive color-changing material coating part connected or contacted with the piezoresistor in a heat conduction mode is changed, and the self-checking function of the piezoresistor is realized.
As the preferred scheme of the utility model, the temperature sensing color-changing material is irreversible temperature sensing color-changing material. The irreversible temperature-sensitive color-changing material is a temperature-sensitive color-changing material which is heated to a certain temperature, the color of the temperature-sensitive color-changing material is changed, the color of the temperature-sensitive color-changing material cannot be recovered and does not change in the cooling process, the irreversible temperature-sensitive color-changing material is subjected to irreversible physical change and chemical change in the heating process, a new substance is produced, the color of the temperature-sensitive color-changing material is irreversible, and the color change of the temperature-sensitive color-changing material is irreversible, so that the piezoresistor adopting the irreversible temperature-sensitive color-changing material can memorize the borne highest temperature through the color, the thermal damage condition of the piezoresistor can be further conveniently judged by a worker according to the color change, the irreversible temperature-sensitive color-changing material with proper temperature and proper color can be selected according to the thermal damage limit temperature of the piezoresistor.
As the preferable scheme of the utility model, the temperature sensing color-changing material coating is one or more of characters, patterns or figures. Can be according to piezo-resistor's in-service behavior, set up the colour-changing body of one or more temperature sensing color-changing material coating for same piezo-resistor, when setting up the colour-changing body of multiple temperature sensing color-changing material coating for same piezo-resistor, the discolour temperature or the colour that discolours of each temperature sensing color-changing coating can set up to the difference, also can be according to actual conditions, adopt the coating of temperature sensing color-changing material coating for characters, in pattern or the figure one or more, make not only realize piezo-resistor's self-checking function from the colour change, can also realize piezo-resistor's self-checking function from the shape of the coating after discolouring, make more striking provide the foundation of judging the thermal destruction condition of piezo-resistor for the staff.
As the preferred scheme of the utility model, be provided with the inoxidizing coating on the temperature sensing color-changing material coating. The protection layer plays a role in protection and heat insulation on the color change body of the temperature-sensitive color change material coating, so that the temperature-sensitive color change material coating is prevented from changing color under the influence of an external environment, and the authenticity and the accuracy of the self-checking function of the piezoresistor are ensured.
As the preferred scheme of the utility model, the temperature sensing color-changing material coating sets up on piezo-resistor body surface. The temperature sensing color changing material coating is directly contacted with the piezoresistor body and is tightly attached to the piezoresistor, so that the temperature sensing color changing material coating can change color in time after being heated, and the thermal damage condition of the piezoresistor is indicated.
As the preferred scheme of the utility model, the color-changing body still include with the conducting strip that piezo-resistor body heat conduction is connected, be provided with on the conducting strip the temperature sensing color-changing material coating. Through adopting the conducting strip conduction piezo-resistor heat that generates heat, realize the instruction of discolouing of temperature sensing color change material coating, avoid because piezo-resistor under extreme condition, because the condition of inside high power loss and unable self convection heat dissipation capacity makes on the direct heat exchange to the conducting strip of heat with heat from piezo-resistor is inside, realize the instruction of temperature sensing color change material coating on the conducting strip, further ensure the accuracy and the promptness of piezo-resistor's self-checking function.
As a preferable embodiment of the present invention, when the number of the color-changing bodies is two or more, the color-changing colors and/or the color-changing temperatures and/or the shapes of the two color-changing bodies are different. According to the actual situation, the specific structure, color, different color-changing temperatures and other related parameters of the color-changing body can be adjusted, so that the arrangement of the color-changing body is adaptive to the self structure, working environment and the like of the piezoresistor, and the accuracy and timeliness of the self-checking function of the piezoresistor are further ensured.
As the preferred scheme of the utility model, the thermal-conduction of piezo-resistor body is connected with temperature sensitive component. The temperature-sensitive element is used for sending a fault signal when the temperature of the piezoresistor body rises to the action temperature of the temperature-sensitive element, when the temperature-sensitive element is connected with the control circuit, the temperature-sensitive element sends the fault signal to the control circuit adopting the piezoresistor in time to prompt the thermal damage condition of the piezoresistor, and when the corresponding control circuit acts according to the fault signal, the protection of a sensitive device can be realized, so that the piezoresistor with the structure not only has the function of displaying the thermal damage condition in time, but also has the function of prompting the protection of the sensitive device.
The surge protector comprises a shell, wherein at least one piezoresistor with the self-checking function is arranged in the shell.
The surge protector of the utility model, by adopting the piezoresistor with the self-checking function, can realize the real-time self-checking monitoring of the piezoresistor through the color change of the color-changing body of the piezoresistor in time, is beneficial to the timely replacement of the piezoresistor after thermal destruction, ensures the normal use of the surge protector, simultaneously, when the piezoresistor connected with the temperature-sensitive element is adopted in the surge protector, the temperature-sensitive element is connected with the heat conducting sheet in a heat conduction way and is connected with the temperature control switch in the shell, so that the temperature control switch in the surge protector sends an action signal through the temperature-sensitive element, when the piezoresistor is thermally destroyed, the temperature control switch breaks the contact in time and cuts off the circuit, thereby achieving the effect of temperature control protection, overcoming the defect that the prior art adopts machinery to realize fault indication, the fault rate is lower, and the use safety of the surge protector is, in addition, the temperature-sensitive element can be connected with the self-locking circuit according to actual conditions, so that after the voltage-sensitive resistor is thermally damaged, the temperature-sensitive element is triggered to generate an action signal for disconnecting the circuit of the surge protector in a heat conduction mode, the circuit disconnection state is locked and maintained after the temperature-sensitive element is recovered through the self-locking circuit, and the safe use of the surge protector is further ensured.
To sum up, owing to adopted above-mentioned technical scheme, the utility model discloses a take piezo-resistor of self-checking function's beneficial effect is:
1. the color-changing body with the temperature sensing color-changing function is connected with the piezoresistor in a heat conduction mode, so that when the temperature of the piezoresistor changes, the color of the color-changing body changes, the self-checking function of the piezoresistor is realized, a worker can judge the thermal damage condition of the piezoresistor according to the color change condition of the color-changing body, the piezoresistor after thermal damage can be replaced in time, and the sensitive device of the piezoresistor with the structure can be protected.
The utility model discloses a surge protector's beneficial effect is:
1. by adopting the piezoresistor with the self-checking function, the real-time self-checking monitoring of the piezoresistor can be realized in time through the color change of the color-changing body of the piezoresistor, the timely replacement of the piezoresistor after thermal damage is facilitated, and the normal use of the surge protector is ensured;
2. when the piezoresistor connected with the temperature-sensitive element is adopted in the surge protector, the temperature-sensitive element is in heat conduction connection with the heat conducting sheet and is connected with the temperature control switch in the shell, so that the temperature-sensitive element sends an action signal to the temperature control switch in the surge protector, and when the piezoresistor is thermally damaged, the temperature control switch timely disconnects a contact and cuts off a circuit, thereby achieving the effect of temperature control protection, overcoming the defect that the prior art adopts machinery to realize fault indication, having lower fault rate and improving the use safety of the surge protector;
3. according to the practical situation, the temperature-sensitive element is connected with the self-locking circuit, so that after the voltage-sensitive resistor is thermally damaged, the temperature-sensitive element is triggered in a heat conduction mode to generate an action signal for disconnecting the circuit of the surge protector, the self-locking circuit is used for locking and maintaining the disconnected state of the circuit after the temperature-sensitive element is recovered, and the safe use of the surge protector is further ensured.
Drawings
FIG. 1 is a schematic structural diagram of a varistor with self-test function according to example 1;
FIG. 2 is a schematic structural diagram of a varistor with self-test function according to example 2;
FIG. 3 is a schematic structural diagram of a varistor with self-test function according to example 3;
fig. 4 is a schematic structural view of a surge protector of embodiment 4.
Reference numerals
1-a piezoresistor body, 2-a color-changing body, 3-a temperature-sensitive color-changing material coating, 4-a protective layer, 5-a heat-conducting sheet, 6-a temperature-sensitive element, 7-a shell, 8-an indicating window and 9-a temperature control switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1, a varistor with self-checking function includes a varistor body 1 and at least one color-changing body 2, the color-changing body 2 includes a temperature-sensitive color-changing material coating 3, the temperature-sensitive color-changing material is an irreversible temperature-sensitive color-changing material, the temperature-sensitive color-changing material coating 3 is disposed on the surface of the varistor body 1, and is connected to the varistor body 1 through heat conduction, the color-changing body 2 changes color with temperature sensing, and marks the temperature condition of the varistor body 1.
The varistor with the self-checking function of this embodiment preferably employs a method in which an irreversible thermochromic material is coated on a varistor body 1 and directly contacts the varistor body 1 to form a thermochromic material coating 3, when the varistor body 1 continuously generates heat to reach a discoloration temperature of the irreversible thermochromic material, the thermochromic material coating 3 generates a color change to indicate a thermal destruction of the varistor, thereby implementing the self-checking function of the varistor, and indicates a worker to replace the varistor according to the color change to protect a sensitive device of the varistor with the structure, the irreversible thermochromic material is of various types, commonly used phosphates, sulfates, nitrates, oxides, sulfides, methyl violet, and phenol compounds of lead, manganese, chromium, zinc, iron, cobalt, nickel, cadmium, strontium, magnesium, barium, molybdenum, and the like, acid clay, azo pigment, arylmethane pigment, etc., and the thermochromic range is generally between 30 and 1200 deg.C, such as NiNH4PO4·6H2O changes from light green to grey blue when heated to 120 ℃, NH 4. VO3 changes from white to brown when heated to 150 ℃, Cd (OH)2When heated to 200 ℃, the color changes from white to yellow, Fe4［Fe( CN)6］2When heated to 250 ℃, the color changes from brown to brown, and Pb CO3When heated to 290 ℃ the color changes from white to yellow, Co C2O4When the varistor is heated to 300 ℃, the color is changed from powder to black, and the irreversible thermochromic material with proper temperature and color can be selected according to the thermal damage limit temperature of the varistor, so that the self-checking function of the varistors with different models and different working environments can be adapted.
Further, this embodiment is with adopting the mode of screen printing, the irreversible temperature sensing color change material that the temperature variation value is 300 ℃ is printed on piezo-resistor body 1, form the discoloring 2 structure for example, the initial condition of this coating is colorless, when the temperature reaches 300 ℃, irreversible temperature sensing color change material discolours to black, make when piezo-resistor because reasons such as thunderbolt temperature surpass 300 ℃, irreversible temperature sensing color change material coating 3 on piezo-resistor body 1 surface takes place the chemical reaction and becomes black, indicate piezo-resistor damage, realize piezo-resistor's self-checking function, the suggestion staff carries out timely change.
Preferably, the thermochromic material coating 3 is one or more of characters, patterns or figures. In the embodiment, the thermosensitive color-changing material coating 3 is preferably formed by printing characters such as 'failure' on the varistor body 1 in a printing mode, so that after the varistor is thermally damaged, the thermal damage condition of the varistor is indicated from the color change, and workers are more obviously indicated in the form of characters to replace the varistor, so that the varistor is more timely replaced.
Further, in this embodiment, it is preferable that the same varistor body 1 is provided with a plurality of mutually independent irreversible thermochromic material coatings 3 having different color change temperatures, different color change colors, and different shapes and structures. Make the setting of irreversible temperature sensing color change material coating 3 and piezo-resistor's self structure, adaptation such as operational environment, adaptability is better, and can realize the periodic self-checking control to piezo-resistor temperature variation through the discoloring temperature that different temperature sensing color change materials correspond and the colour that discolours, further guarantee piezo-resistor's self-checking function's accuracy and timeliness, it is concrete, preferably set up four rings of colour or typewriter ribbon of 150 ℃, 200 ℃, 250 ℃, 300 ℃ on the piezo-resistor body, make when piezo-resistor body 1's temperature variation, the color ring or the typewriter ribbon that correspond the temperature can show, make the maximum temperature value that obtains piezo-resistor body 1 and reach through the change in proper order of ring of colour or typewriter ribbon.
Preferably, a protective layer 4 is disposed on the thermochromic material coating 3. The one deck protection oil is preferably smeared on temperature sensing color-changing material coating 3 to this embodiment, avoid the coating to drop, play the guard action to temperature sensing color-changing material coating 3, and simultaneously, inoxidizing coating 4 has certain thermal-insulated effect, avoid external environment temperature's change to influence temperature sensing color-changing material coating 3's colour change on the one hand, on the other hand also with the heat restriction that piezo-resistor body 1 gived off within inoxidizing coating 4, it is better with 3 heat-conduction effects of temperature sensing color-changing material coating, further ensure authenticity and the accuracy of piezo-resistor's self-checking function.
Example 2
As shown in fig. 1-2, the structure of the varistor with self-test function of this embodiment is the same as that of embodiment 1, except that: the color-changing body 2 further comprises a heat conducting sheet 5 in heat conducting connection with the pressure sensitive resistor body 1, and the temperature sensing color-changing material coating 3 is arranged on the heat conducting sheet 5.
The utility model provides a take piezo-resistor of self-checking function of this embodiment, through 5 and the 1 heat exchange of piezo-resistor body with the conducting strip that 1 direct links to each other of piezo-resistor body, the heat conduction that produces piezo-resistor body 1 comes out, and adopt screen printing's mode to form temperature sensing color-changing material coating 3 on conducting strip 5, the realization instructs piezo-resistor's thermal destruction condition on conducting strip 5, avoid piezo-resistor body 1 because inside high power loss can't be through self heat dissipation capacity, further ensure the accuracy and the timeliness of piezo-resistor's self-checking function.
Example 3
As shown in fig. 1 to 3, the structure of the varistor with self-test function of this embodiment is the same as that of embodiment 2, except that: the piezoresistor body 1 is connected with a temperature-sensitive element 6 in a heat conduction mode.
In the present embodiment, the varistor with the self-checking function is preferably a varistor connected with the thermal conductive sheet 5, so that the thermal conductive sheet 5 is in thermal conduction connection with the temperature-sensitive element 6, the temperature-sensitive element 6 includes one or more of a temperature-sensitive switch, a thermal-sensitive semiconductor device, a thermal resistor, and a thermocouple, in this embodiment, the normally-closed temperature-sensitive switch is taken as an example, the normally-closed temperature-sensitive switch adopts a bimetallic sheet as a temperature-sensitive component, a temperature-sensitive metal sheet of the normally-closed temperature-sensitive switch is tightly attached to the thermal conductive sheet 5, so as to achieve the thermal conduction connection between the thermal conductive sheet 5 and the normally-closed temperature-sensitive switch, in order to ensure the temperature-sensing effect, in this embodiment, it is further preferred that a contact surface between the thermal conductive sheet 5 and the normally-closed temperature-sensitive switch is coated with a thermal conductive silicone grease or other thermal conductive media with similar performance, so that when the varistor normally, when the temperature of the piezoresistor rises to reach the thermal destruction limit, the irreversible temperature-sensitive color-changing material coating 3 arranged on the piezoresistor body 1 and/or the heat conducting sheet 5 changes color to indicate a worker to replace the piezoresistor and conduct the temperature to the normally-closed temperature-controlled switch, the bimetallic sheet is heated to generate internal stress to act rapidly, the contact is disconnected, and the circuit is cut off, so that the temperature control protection effect is achieved, and the piezoresistor with the structure not only has the function of displaying the thermal destruction condition in time, but also has the function of protecting sensitive devices.
Further, in this embodiment, preferably, the temperature-sensitive element 6 is electrically connected to the self-locking circuit, so that after the temperature-sensitive element 6 is turned back on, the cut-off circuit is maintained to be in a cut-off state, and after the piezoresistor is replaced, the circuit needs to be manually restored to work, thereby further realizing the protection function of the piezoresistor with the structure on the sensitive device.
Example 4
As shown in fig. 1 to 4, a surge protector comprises a housing 7, and at least one varistor with a self-checking function as described in embodiment 3 is arranged in the housing 7.
A surge protector of this embodiment, adopt the varistor with self-checking function of embodiment 3, there are temperature control switch 9 and corresponding self-locking circuit or self-locking mechanism in the casing 7, set up the indicating window 8 on the casing 7 corresponding to the position of the color-changing body 2, enable the staff to monitor the thermal destruction condition of the varistor in the indicating window 8 according to the color change in time, realize the timely replacement of the varistor after thermal destruction, guarantee the normal use of the surge protector, meanwhile, the temperature sensitive component 6 set up in the casing 7 is connected with temperature control switch 9 in the casing 7, the temperature control switch 9 is connected with corresponding self-locking circuit, when the varistor is thermally destroyed, the temperature control switch 9 breaks the contact in time, the circuit is cut off, the self-locking circuit realizes the locking and maintaining of the circuit breaking state after the temperature sensitive component 6 recovers, achieve the effect of temperature control protection, the defect that fault indication is realized by adopting machinery in the prior art is overcome, the fault rate is lower, and the use safety of the surge protector is improved.
The above embodiments are only used to illustrate the present invention and not to limit the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above embodiments, therefore, any modifications or equivalent replacements of the present invention can be made, and all technical solutions and modifications without departing from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a take piezo-resistor of self-checking function which characterized in that: the temperature-sensing color-changing resistor comprises a piezoresistor body and at least one color-changing body, wherein the color-changing body is in heat conduction connection with the piezoresistor body, and the color-changing body changes color under the temperature sensing condition to mark the temperature condition of the piezoresistor body.
2. The varistor with self-test function as claimed in claim 1, wherein: the color-changing body comprises a temperature-sensitive color-changing material coating.
3. The varistor with self-checking function as claimed in claim 2, characterized in that: the temperature sensing color changing material is an irreversible temperature sensing color changing material.
4. The varistor with self-checking function as claimed in claim 2, characterized in that: the temperature-sensitive color-changing material coating is one or more of characters, patterns or figures.
5. The varistor with self-checking function as claimed in claim 2, characterized in that: and a protective layer is arranged on the temperature sensing color changing material coating.
6. The varistor with self-checking function as claimed in claim 2, characterized in that: the temperature sensing color changing material coating is arranged on the surface of the piezoresistor body.
7. The varistor with self-checking function as claimed in claim 2, characterized in that: the color-changing body further comprises a heat conducting sheet in heat conducting connection with the piezoresistor body, and the temperature sensing color-changing material coating is arranged on the heat conducting sheet.
8. The varistor with self-test function as claimed in claim 1, wherein: when the number of the color-changing bodies is more than two, the color-changing colors and/or the color-changing temperatures and/or the shapes of the two color-changing bodies are different.
9. The varistor with self-test function according to any of claims 1-8, characterized in that: the piezoresistor body is connected with a temperature-sensitive element in a heat conduction mode.
10. A surge protector comprises a shell, and is characterized in that: at least one piezoresistor with self-checking function as claimed in claim 9 is arranged in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921151582.8U CN209947566U (en) | 2019-07-22 | 2019-07-22 | Varistor with self-checking function and surge protector thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921151582.8U CN209947566U (en) | 2019-07-22 | 2019-07-22 | Varistor with self-checking function and surge protector thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209947566U true CN209947566U (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921151582.8U Active CN209947566U (en) | 2019-07-22 | 2019-07-22 | Varistor with self-checking function and surge protector thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209947566U (en) |
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2019
- 2019-07-22 CN CN201921151582.8U patent/CN209947566U/en active Active
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Address after: 618000, No.19 Tumenjiang Road, Deyang City, Sichuan Province Patentee after: Sichuan Yingjie New Energy Co.,Ltd. Address before: 618000 northeast corner of Minshan road and Tumenjiang Road, economic development zone, Deyang City, Sichuan Province Patentee before: SICHUAN WEIYU ELECTRIC Co.,Ltd. |
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