CN111370235A - Switch contact use frequency indicating device and switch contact element - Google Patents
Switch contact use frequency indicating device and switch contact element Download PDFInfo
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- CN111370235A CN111370235A CN201811602905.0A CN201811602905A CN111370235A CN 111370235 A CN111370235 A CN 111370235A CN 201811602905 A CN201811602905 A CN 201811602905A CN 111370235 A CN111370235 A CN 111370235A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator
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Abstract
The application relates to a switch contact number of use indicating device and switch contact component, wherein, this switch contact number of use indicating device includes: the transmission component is connected with the tested switch contact and used for generating a transmission signal when the tested switch contact acts; a fluid pump-out component connected to the transmission component for receiving the transmission signal and pumping out a predetermined volume of fluid upon receipt of the transmission signal; and the indicating part is connected with the fluid pumping-out part and is used for indicating the use times of the switch contact to be tested according to the accumulated fluid pumped out by the fluid pumping-out unit. Through the above method, the problem that the cost is too high due to the fact that the existing switch contact use frequency determining mode is too complex is solved, and the technical effect of monitoring the service life of the switch contact in real time at low cost is achieved.
Description
Technical Field
The application relates to the field of electrical equipment, in particular to a switch contact use frequency indicating device and a switch contact element.
Background
In the field of electrical systems and industrial automation, a large number of switching contact elements such as relays, contactors, and buttons are generally used to perform electrical on/off control and signal transmission. Under normal use conditions, when the number of uses exceeds its rated service life, this can lead to reduced reliability or functional failure of such components.
The service life of a switch contact element is generally divided into a mechanical life and an electrical life, the mechanical life and the electrical life are calculated by using the contact action times, and the electrical life is mainly used as a reference in the actual use process of the element. When the number of times of using the switch contact exceeds the design life, the reliability of the use is greatly reduced, thereby affecting the reliability of the system. However, the current number of times of use of the existing switch contact type element is often not visually seen, which results in that people cannot effectively judge the service life of the switch contact type element.
In an industrial automation system, a large number of switch contact elements are used, and due to the fact that the switch contact elements do not have a service life indicating function, the switch contact elements can be searched, found and replaced only when the switch contact elements fail to work and a system fails, but loss caused by failure is inevitable. At present, the service life of switch contact elements is judged and predicted mainly by methods such as contact resistance, abrasion condition, spectrum analysis or modeling analysis based on specific parameters, a set of complex detection system is needed to be added to monitor the contact working condition for a long time, the application cost is expensive, and the on-line real-time monitoring application value is not provided.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a switch contact usage number indicating device and a switch contact element.
In a first aspect, the present application provides a switch contact usage number indicating device, comprising:
the transmission component is connected with the tested switch contact and used for generating a transmission signal when the tested switch contact acts;
a fluid pump-out component connected to the transmission component for receiving the transmission signal and pumping out a predetermined volume of fluid upon receipt of the transmission signal;
and the indicating part is connected with the fluid pumping-out part and is used for indicating the use times of the switch contact to be tested according to the accumulated fluid pumped out by the fluid pumping-out unit.
In one embodiment, the indication means comprises: and the container is provided with scales, and the use times of the contact of the switch to be tested is indicated through the scales.
In one embodiment, the indication means further comprises: and the piston-shaped pointer indicates the number of times of using the switch contact to be tested through the scale indicated by the movement of the piston-shaped pointer.
In one embodiment, the above apparatus further comprises: and the warning output component is triggered to output warning information when the pointer moves to the position of the warning output component.
In one embodiment, the fluid is a gas or a liquid.
In one embodiment, the indicator member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicator member is connected to the input port of the fluid pump-out member, and the output port of the fluid pump-out member is connected to the input port of the indicator member.
In one embodiment, the indicator member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicator member is connected to air, the input port of the fluid pump-out member is connected to air, and the output port of the fluid pump-out member is connected to the input port of the indicator member.
In one embodiment, the indicator member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicator member is connected to the input port of the fluid pump-out member, the output port of the fluid pump-out member is connected to air, and the input port of the indicator member is connected to air.
In one embodiment, the fluid pump-out component is a one-way pump.
In a second aspect, the present application provides a switch contact element comprising a switch contact usage number indication arrangement as described above.
The utility model provides a switch contact number of times indicating device and switch contact element use, through setting up transmission parts, fluid pump out parts and indicating part, utilize the mode of converting the switch contact action into fluid medium pump output, the simple efficient demonstration to switch contact number of times of use has been realized, it is lower to realize the cost, the problem that current switch contact number of times of use confirms that the mode is too complicated leads to the cost too high has been solved through above-mentioned mode, the technical effect of low-cost real-time supervision switch contact life-span has been reached.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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 description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram illustrating a structure of a device for indicating the number of times of use of a switch contact according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a switch contact life indicating mechanism according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method for indicating the service life of a switch contact according to an embodiment of the present disclosure;
FIG. 4 is a diagram of an example of a contact life detection apparatus according to an embodiment of the present application, FIG. 1;
FIG. 5 is a diagram of an example of a contact life detection apparatus according to an embodiment of the present application, FIG. 2;
FIG. 6 is a diagram of an example of a contact life detection apparatus according to an embodiment of the present application, FIG. 3;
FIG. 7 is a schematic diagram of a relay with contact life indication according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a button with a contact life indication according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The existing methods for detecting the use times of the contact type elements are complex and high in cost. Therefore, the simple device capable of visually indicating the current use times of the element and giving a warning is provided in the embodiment, so that the element can be replaced in time before the service life of the element is reached, and the reliability of the system can be effectively improved.
Specifically, considering that the service life of the switch contact type element is directly related to the contact action times, most application occasions do not need to accurately obtain the contact action times or accurately expect the contact failure time, but only need to obtain whether the current accumulated action times are close to a nominal life value, and the current accumulated action times can be visually presented outwards. The method for indicating the service life of the switch contact element can get rid of the dependence on electrical accurate measurement, record the contact action times on line in real time by a physical method, and can intuitively display the proportion of the relative rated service life, thereby realizing lower cost.
As shown in fig. 1, in this example, there is provided a switch contact use number indicating device, which may include:
the transmission component is connected with the tested switch contact and used for generating a transmission signal when the tested switch contact acts;
a fluid pump-out component connected to the transmission component for receiving the transmission signal and pumping out a predetermined volume of fluid upon receipt of the transmission signal;
and the indicating part is connected with the fluid pumping-out part and is used for indicating the use times of the switch contact to be tested according to the accumulated fluid pumped out by the fluid pumping-out unit.
In order to make it possible to make a simple observation of the service life, the above-mentioned indicating means may comprise: and the container is provided with scales, and the use times of the contact of the switch to be detected is indicated through the scales. That is, the user only needs to look at the scale on the container to know approximately the number of contact uses.
When the pointer is used, the scales are arranged, so that the pointer can be set for indication, the pointer can not be set for indication, and whether the pointer is set or not can be selected according to actual needs. For example, when the medium is in the form of a level change in the container, the pointer may not be provided. When the method is implemented, a piston-shaped pointer can be arranged, and the scales indicated by the movement of the piston-shaped pointer indicate the use times of the switch contact to be tested. That is, in the case of liquid force or air pressure force, the pointer can move, thereby achieving indication of the scale. The specific method can be selected according to actual needs, and the application does not limit the method.
The switch contact use frequency indicating device is used for indicating the use frequency of a switch contact component so as to give an early warning of the frequency or the service life, so that people can replace the switch contact in time. For this purpose, the switch contact use number indicating device may be further provided with a warning output unit that is triggered to output warning information when the pointer moves to a position of the warning output unit. Namely, when the early warning value is reached, the early warning of the number of times of use/service life is triggered.
The fluid may be a gas or a liquid, considering that gas and liquid are easy to realize volume deformation and measurement.
For a specific setting, it can be realized according to, but not limited to, one of the following connection modes:
1) the indicating component is provided with an output port and an input port, and the fluid pumping-out component is provided with an input port and an output port, wherein the output port of the indicating component is connected with the input port of the fluid pumping-out component, and the output port of the fluid pumping-out component is connected with the input port of the indicating component; that is, the fluid pumping-out member pumps out the fluid in the indicating member and into the indicating member.
2) The indicating component is provided with an output port and an input port, and the fluid pumping-out component is provided with an input port and an output port, wherein the output port of the indicating component is connected with air, the input port of the fluid pumping-out component is connected with air, and the output port of the fluid pumping-out component is connected with the input port of the indicating component; that is, the fluid pumping-out part pumps the externally introduced fluid into the indicating part.
3) The indicating component is provided with an output port and an input port, the fluid pumping-out component is provided with an input port and an output port, the output port of the indicating component is connected with the input port of the fluid pumping-out component, the output port of the fluid pumping-out component is connected with air, and the input port of the indicating component is connected with the air. That is, the fluid pumping-out member pumps the fluid out of the indicating member.
The fluid pumping-out part may be, but is not limited to, a one-way pump.
The switch contact use number indicating means may be built into the switch contact member, i.e. the switch contact use number indicating means may be part of the switch contact member.
The above-mentioned device structure is described below with reference to a specific embodiment, however, it should be noted that this specific embodiment is only for better describing the present application and should not be construed as limiting the present application.
In order to solve the problem that the service life of the switch contact type element is invisible, a simple and low-cost contact action time recording and indicating device and method are provided in the embodiment.
Specifically, in this example, the switch contact type element has the characteristic of an action executing mechanism, the transmission mechanism directly or indirectly utilizes the power generated by the action executing mechanism to drive the one-way pump structure in the life indicating device, and the one-way pump structure in the life indicating device pumps out a fixed volume of fluid medium in each action under the driving of the power. The fluid medium pumped by the one-way pump structure is accumulated in the fluid collecting container, and the action times of the switch contact are indirectly recorded.
Furthermore, the accumulation of the fluid medium in the fluid collection container can cause the change of the volume, thereby pushing the piston-shaped indicating pointer in the fluid collection container to move, and realizing the function of indicating the accumulated action times. The collecting container can be provided with a display window and a scale outwards, and the position of the indicating pointer can be visually displayed through the display window and the scale, so that whether the product is close to or reaches the service life of the product can be visually acquired. An external alarm output signal is triggered when the pointer in the fluid collection container reaches the end-of-life alarm position. The external monitoring device prompts after detecting the alarm signal and requires to replace the corresponding switch contact element in time, thereby ensuring the reliable and stable operation of the system.
In order to achieve the above purpose, in this embodiment, a device with a switch contact use number recording and indicating function is provided, as shown in fig. 2, in this implementation, the switch contact life indicating device 11 includes three parts, namely a transmission unit 111, a fluid pumping-out unit 112 and a use action number recording and indicating unit 113. The transmission unit 111 is connected with the fluid pumping-out unit 112, the fluid pumping-out unit 112 is connected with the action frequency recording and indicating unit 113, the action executing mechanism 10 of the switch contact element is connected with the transmission unit 111 in the switch contact service life indicating device 11, and the energy of the contact action or control signal is transmitted to the transmission unit 111 and converted into the working power source of the switch contact service life indicating device 11. The alarm contact output of the action number recording indication unit 113 is connected with the monitoring device 12.
1) The transmission unit 111, which is connected to the fluid pumping unit, may directly or indirectly implement power transmission by using an operation actuator of a switch contact element, or by adding an auxiliary contact. And the external contact action or the control action of the contact is converted into the driving power for the operation of the whole device.
2) And a fluid pumping-out unit 112 connected with the transmission unit and used for converting the single action of the transmission unit into the fluid medium pumping-out quantity with fixed capacity, and establishing a linear relation between the contact action times and the fluid medium pumping-out quantity.
Wherein, the fluid pumping-out unit can adopt a one-way pump structure, such as: a diaphragm pump structure, a pumping structure using piezoelectric ceramics, or other simpler one-way pump structures to achieve the suction and pumping of the fluid medium. The fluid medium may be liquid or gas, and the fluid medium may be made of a material that is not easily volatilized and has high thermal stability, such as: methyl silicone oil and the like are used as recording materials.
3) The operation number recording indication unit 113, connected to the fluid pumping-out unit, may include: the container, the indicating pointer and the scale convert the fluid medium sent by the fluid pumping unit into the movement of the position of the indicating pointer, so that the position of the accumulated working times of the switch contact in the rated working life is visually displayed.
The container can be a cavity with a certain volume and a regular shape, a piston-shaped indicating pointer is arranged in the cavity and can move in the container, the container is used for containing fluid media pumped by the fluid pumping-out unit, and the total volume of the container is determined by the single pumping quantity and the rated service life of the fluid pumping-out unit.
The device with the functions of recording and indicating the use times of the switch contact provides a driving power input interface and an external indication interface for the outside, and can realize the visual display of the external contact action power input and the contact accumulated action times and the output of a service life ending alarm signal. The device with the functions of recording and indicating the number of times of use of the switch contact (which may be simply referred to as a life indicating device) may be directly disposed on the body structure of the switch contact element, for example, may be directly designed on the housing of the element to become a part of the element, thereby realizing the functions of recording and indicating the life of the element.
Compared with the prior art, the method has the advantages that the action times of the switch contact are recorded by converting the action of the switch contact into the fluid medium, the visual indication of the service life is realized, the traditional thought of electrical measurement is broken away, and a simple thought and a low-cost method are provided.
Specifically, the device having the functions of recording and indicating the number of times of use of the switch contact shown in fig. 2 may further include: the actuating mechanism 10 of the switch contact element may be a contact action itself or a contact control signal, which is a contact action signal to be detected, wherein the contact control signal may be a mechanical force signal or an electrical signal, or an electrical signal converted from a mechanical force signal, and the signal transmission is performed once for each action of the external contact.
As shown in fig. 3, a mechanical force or an electrical signal generated by the motion actuator 10 of the switching contact element is transmitted to the transmission unit 111, and the contact motion signal is converted into a driving force by the transmission unit 111 to drive the fluid pumping unit 112.
The fluid pumping-out unit 112 completes one squeezing movement under the driving force, and outputs a fixed volume of fluid medium to the use action number recording indication unit 113. The fluid pumping-out unit 112 has two ports, one end is used for inputting the fluid medium, and the other end outputs the fluid medium, and specifically, the one-way movement of the fluid when driven by the external force can be realized through the two one-way valves 1121. The volume of the output fluid medium is constant in each action and is determined by the design of the fluid pumping unit.
Three specific examples are described below:
example 1
As shown in fig. 4, the operation number recording instruction unit 113 includes: the fluid collection container 1131, the indication pointer 1132, the scale 1133 and the fluid medium 1134 filled in the fluid collection container are formed, and an alarm contact 1135 for outputting the alarm is arranged.
The fluid collection container 1131 has two ports, which are respectively connected to two ends of the fluid pumping unit 111 to form a closed annular connector structure, the indication pointer 1132 is disposed in the fluid collection container 1131, and may be designed in a piston shape, so as to separate the fluid collection container 1131 into two parts, and can move in the fluid collection container 1131 under the action of force, and the fluid medium 1134 fills the fluid pumping unit 111 and the life indication unit 113.
The fluid collection container 1131 has a certain volume, and can accumulate the fluid medium 1134 sent by the fluid pumping unit 113 each time. As the fluid pumping-out unit 111 moves, fluid medium 1134 is continuously sucked in from one side of the flow collection container 1131 and pumped in from the other side, and the change of the volume of the fluid medium 1134 on both sides of the indicating needle 1132 generates a pressure difference, thereby pushing the indicating needle 1132 to move.
The scale 1133 is used to indicate the cumulative number of contact movements, and to visually correspond the cumulative number of contact operations to the nominal life. When the pointer 1132 reaches the alarm position, the alarm contact 1135 is triggered to output an alarm signal to the outside for the external monitoring device 12 to detect.
After the contact action passes through the transmission unit 110 and the flow conversion unit 111, the contact single action is converted into the fixed fluid medium 1134 to be output, and the fluid collection container 1131 has a large volume, so that the input fluid medium 1134 can be accumulated, and the contact action times can be recorded.
Wherein the output of fluid medium from the fluid pumping unit 112 is constant, and thus the contact action is linearly proportional to the fluid medium 1134 entering the fluid collection vessel 1131. A more intuitive indication of contact life may be achieved by indicating the number of contact strokes the pointer 1132 makes linear with the scale 1133. And an alarm contact 1135 is provided to output an alarm contact signal to the outside.
Example 2
As shown in fig. 5, the operation number recording instruction unit 113 includes: fluid collection vessel 1131, scale 1133, and indicator material 1134 filled therein. The fluid collection vessel 1131 has two ports, one of which is connected to the output of the fluid pump-out unit 121 and the other of which is a one-way valve that only allows the medium to flow out of the cavity. The input of the fluid pump-out unit 112 is directly connected to the atmosphere.
The fluid collection container 1131 is filled with an indicating material 1134, the indicating material 1134 may be a color-changeable substance, for example, may be a color-changeable deoxidizer or other material, when the fluid pumping unit 111 performs a contact action, air in the atmosphere is squeezed into the fluid collection container 1131 as a fluid medium, the indicating material 1134 in the fluid collection container reacts after encountering air to generate a color change and a functional failure, and as the air entering the cavity accumulates, the filled indicating material 1134 changes color in a layer-by-layer failure manner, and an indication indicating the number of times of the contact accumulation action performed by the pointer 1132 is automatically formed.
Example 3
As shown in fig. 6, the operation number recording instruction unit 113 includes: fluid collection vessel 1131, scale 1133, and indicator material 1134 filled therein. The fluid collection container 1131 has two ports, one of which is connected to the fluid medium input of the fluid pump-out unit 121 and the other of which is connected to the outside atmosphere. The output of the fluid pump-out unit 112 is also directly connected to the atmosphere.
The indicating material 1134 is filled in the fluid collection container 1131, the indicating material 1134 may be a lubricating or volatile material, when the fluid pumping unit 111 performs a contact action, the indicating material in the fluid collection container 1131 is sucked out from the fluid collection container 1131, the indicating material 1134 in the fluid collection container 1131 is discharged to the external environment after passing through the fluid pumping unit 121, and the mechanical component is lubricated or directly volatilized into the air, and the indicating material 1134 filled in the fluid collection container 1131 is sucked out in an accumulated manner to drive the indicating pointer 1132 to move, so as to visually display the indication of the number of times of the contact accumulation action. When the pointer 1132 reaches the end-of-life alarm position, an external alarm output signal 1135 is triggered, and detection and alarm are performed by the external monitoring device 12.
Fig. 7 is an exemplary schematic diagram of a relay with contact life indication, and fig. 8 is an exemplary schematic diagram of a button with contact life indication.
In the above example, the method of converting the switch contact action into the fluid medium pumping quantity, recording the action times of the switch contact by adopting a physical passive recording mode, and visually indicating the service life is adopted, and the service life indicating device of the switch contact type element can be used as a function of the switch contact type element to appear on a product.
The utility model provides a switch contact number of times indicating device and switch contact element use, through setting up transmission parts, fluid pump out parts and indicating part, utilize the mode of converting the switch contact action into fluid medium pump output, the simple efficient demonstration to switch contact number of times of use has been realized, it is lower to realize the cost, the problem that current switch contact number of times of use confirms that the mode is too complicated leads to the cost too high has been solved through above-mentioned mode, the technical effect of low-cost real-time supervision switch contact life-span has been reached.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A switch contact use number indicating device, comprising:
the transmission component is connected with the tested switch contact and used for generating a transmission signal when the tested switch contact acts;
a fluid pump-out component connected to the transmission component for receiving the transmission signal and pumping out a predetermined volume of fluid upon receipt of the transmission signal;
and the indicating part is connected with the fluid pumping-out part and is used for indicating the use times of the switch contact to be tested according to the accumulated fluid pumped out by the fluid pumping-out unit.
2. The apparatus of claim 1, wherein the indicating means comprises: and the container is provided with scales, and the use times of the contact of the switch to be tested is indicated through the scales.
3. The apparatus of claim 2, wherein the indicating means further comprises: and the piston-shaped pointer indicates the number of times of using the switch contact to be tested through the scale indicated by the movement of the piston-shaped pointer.
4. The apparatus of claim 3, further comprising: and the warning output component is triggered to output warning information when the pointer moves to the position of the warning output component.
5. The device of claim 1, wherein the fluid is a gas or a liquid.
6. The apparatus of claim 1, wherein the indicator member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicator member is connected to the input port of the fluid pump-out member, and the output port of the fluid pump-out member is connected to the input port of the indicator member.
7. The apparatus of claim 1, wherein the indicating member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicating member is connected to air, the input port of the fluid pump-out member is connected to air, and the output port of the fluid pump-out member is connected to the input port of the indicating member.
8. The apparatus of claim 1, wherein the indicating member is provided with an output port and an input port, and the fluid pump-out member is provided with an input port and an output port, wherein the output port of the indicating member is connected to the input port of the fluid pump-out member, the output port of the fluid pump-out member is connected to air, and the input port of the indicating member is connected to air.
9. The device of any one of claims 1 to 8, wherein the fluid pumping-out component is a one-way pump.
10. A switch contact element, characterized in that it comprises a switch contact use number indication device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811602905.0A CN111370235B (en) | 2018-12-26 | 2018-12-26 | Switch contact use frequency indicating device and switch contact element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811602905.0A CN111370235B (en) | 2018-12-26 | 2018-12-26 | Switch contact use frequency indicating device and switch contact element |
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| CN111370235A true CN111370235A (en) | 2020-07-03 |
| CN111370235B CN111370235B (en) | 2022-11-22 |
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| DE20103940U1 (en) * | 2001-03-07 | 2001-08-02 | Woelfel Bernhard | Mechanical rain gauge |
| CN2454831Y (en) * | 2000-12-15 | 2001-10-17 | 游图明 | Memory assisting device |
| CN103354800A (en) * | 2011-01-05 | 2013-10-16 | N·莱文 | A fluid flow meter |
| CN203502561U (en) * | 2013-10-22 | 2014-03-26 | 珠海格力电器股份有限公司 | Service life detection system of contact switch |
| CN108508355A (en) * | 2018-04-12 | 2018-09-07 | 浙江众合科技股份有限公司 | A kind of relay life test device |
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2018
- 2018-12-26 CN CN201811602905.0A patent/CN111370235B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1584839A (en) * | 1977-09-01 | 1981-02-18 | Atlantic Richfield Co | Flow responsive counting apparatus |
| CN1061651A (en) * | 1991-05-21 | 1992-06-03 | 孙寅贵 | Contactless liquid obtains the apparatus and method of flow parameter |
| CN2454831Y (en) * | 2000-12-15 | 2001-10-17 | 游图明 | Memory assisting device |
| DE20103940U1 (en) * | 2001-03-07 | 2001-08-02 | Woelfel Bernhard | Mechanical rain gauge |
| CN103354800A (en) * | 2011-01-05 | 2013-10-16 | N·莱文 | A fluid flow meter |
| CN203502561U (en) * | 2013-10-22 | 2014-03-26 | 珠海格力电器股份有限公司 | Service life detection system of contact switch |
| CN108508355A (en) * | 2018-04-12 | 2018-09-07 | 浙江众合科技股份有限公司 | A kind of relay life test device |
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| Publication number | Publication date |
|---|---|
| CN111370235B (en) | 2022-11-22 |
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