CN214409215U - On-site density relay calibration device - Google Patents
On-site density relay calibration device Download PDFInfo
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- CN214409215U CN214409215U CN202120219397.9U CN202120219397U CN214409215U CN 214409215 U CN214409215 U CN 214409215U CN 202120219397 U CN202120219397 U CN 202120219397U CN 214409215 U CN214409215 U CN 214409215U
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Abstract
The utility model discloses an on-site density relay calibration device, which comprises a first cylinder, a first cavity and a second cavity, wherein a push rod is arranged in the first cylinder in a sliding way, and the on-site density relay calibration device also comprises a driving mechanism; a first piston and a second piston are arranged on the push rod, the space between the first piston and the second piston is a first closed space, and the space between the second piston and the inner wall of the first cavity is a second closed space; the first closed space is communicated with the second closed space through a first pipeline; the first closed space is communicated with the first pipeline, the temperature detection mechanism, the pressure detection mechanism and the first valve are arranged on the first pipeline, and the end part of the first pipeline is provided with an air passage interface. The utility model has the advantages that: the speed and the calibration precision can be considered during actual calibration, the overall structure is simple, the operation is convenient, and the cost is low.
Description
Technical Field
The utility model relates to a density relay check-up field, concretely relates to on-spot density relay calibration equipment.
Background
SF6The switch being a high-voltage electrical appliance, SF, widely used in electric power systems6Reliable operation of the switch has become one of the most interesting issues for the supply and consumption sector. SF6The gas density relay is used for monitoring SF in operation6SF in switch body6The important elements of the gas density variation, the performance of which directly affects the SF6The operation of the switch is safe. SF for field operation6Because the gas density relay does not act frequently, phenomena of inflexible action, poor contact of contacts and the like often occur after a period of time, the temperature compensation performance of the density relay is also deteriorated in some cases, and SF is often caused when the environmental temperature changes suddenly6The density relay malfunctions. Therefore, DL/T596-1996 "preventive test procedure for Power plants" stipulates that: each SF6Switch unit of use should regularly cope with SF6And checking the gas density relay.
However, if the density relay is disassembled from the electrical equipment for verification, part of SF is lost during the process of disassembling the density relay6Gas, and the sealing performance of the sealing gasket is reduced due to long-term disassembly, so that gas leakage is easily caused, and hidden danger is brought to the safe operation of the whole power grid; in addition, the time spent for disassembling the density relays is long, so that the scheduled inspection workload is large, the working efficiency is low, and the verification work of all the density relays is difficult to complete in the scheduled maintenance power failure period. Based on the situation, the problem can be solved on site by an apparatus for rapidly checking the density relay without disassembling the sulfur hexafluoride.
In the prior art, for example, chinese utility model patent with publication number CN210863965U discloses an electrical system with online sampling and checking functions, which includes: the device comprises electrical equipment, a gas density relay, a pressure sensor, a temperature sensor, a valve, a pressure adjusting mechanism, an online checking contact signal sampling unit, an intelligent control unit, a multi-way connector and an air supplementing interface. The pressure adjusting mechanism is a cavity with an opening at one end, a piston is arranged in the cavity and provided with a sealing ring, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in contact with the inner wall of the cavity, and the driving part drives the adjusting rod and then drives the piston to move in the cavity to control pressure change. The device can be used for high-voltage and medium-voltage electrical equipment and comprises electrical equipment, a gas density relay, a gas density detection sensor, a valve, a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit. Through the lift of pressure adjustment mechanism regulated pressure, make electrical equipment's gas density relay take place the contact action, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, density value when the intelligence is controlled the unit and is moved according to the contact, detect out warning and/or shutting contact signal action value and/or return value, need not the maintainer to the on-the-spot check-up work that just can accomplish gas density relay, the reliability of electric wire netting has been improved greatly, the efficiency is improved, the cost is reduced, realize the mutual self-checking between gas density relay and gas density detection sensor simultaneously, and then realize non-maintaining.
In the patent, one motor is used for driving, and a direct current motor is difficult to commutate, can generate sparks, has short service life and high price, so that the motor is not suitable for the verification process of the density relay; the speed regulation performance of the alternating current motor is poor, and flexible speed change cannot be realized in the density relay calibration process. SF at or above 72.5kV rated voltage of standard GGDW 11921.36/N2Part 3 of the mixed gas insulated metal enclosed switchgear: the density relay technical specification specifies that the load change speed in the density relay verification process is not more than 1% of the measuring range per second, and the smaller the load change speed is, the smaller the error caused by the load change speed in the verification process is. Therefore, in the process of load change, when the load is close to the point to be detected, the smaller the load change speed, the better. However, if the whole verification process is performed at a very low load change speed, too much time is consumed, and therefore the motor is required to be capable of flexibly changing speed in the verification process of the density relay.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: the density relay calibration device in the prior art can not flexibly change speed and change direction.
The utility model discloses a realize solving above-mentioned technical problem through following technical means: an on-site density relay calibration device comprises a first air cylinder, wherein a first cavity and a second cavity which are communicated with each other are arranged in the first air cylinder, and the diameters of the first cavity and the second cavity are different;
the first cylinder is internally provided with a push rod in a sliding manner, and the first cylinder also comprises a driving mechanism capable of driving the push rod to reciprocate;
the push rod is provided with a first piston and a second piston, the first piston is in sliding fit with the side wall of the second cavity, the second piston is in sliding fit with the side wall of the first cavity, the space between the first piston and the second piston is a first closed space, and the space between the second piston and the inner wall of the first cavity is a second closed space;
the first closed space is communicated with the second closed space through a first pipeline, and a first valve is arranged on the first pipeline;
the first closed space is communicated with the first pipeline, the temperature detection mechanism, the pressure detection mechanism and the first valve are arranged on the first pipeline, and the end of the first pipeline is provided with a gas circuit interface.
The utility model provides an on-site density relay calibration equipment is when practical application, with first cavity, the second cavity sets the diameter different, simultaneously with first piston, the second piston is through same push rod and actuating mechanism drive, and be connected first airtight space and the airtight space of second through first pipeline, and utilize first valve control break-make, when checking up, can realize nimble variable speed through same actuating mechanism, the switching-over, in the load change in-process, stage load change speed is very fast at first, and when the load is close to treating the check point, load change speed diminishes, and then compromise speed and check-up precision when can satisfying actual check-up, and overall structure is simple, high durability and convenient operation, the cost is lower.
Preferably, the driving mechanism adopts an alternating current motor.
The alternating current motor is convenient to commutate, long in service life and relatively low in price, and can meet the checking requirement.
Preferably, the driving mechanism adopts an alternating current push rod motor, the axis of the alternating current push rod motor is parallel to the push rod, and the telescopic end of the alternating current push rod motor is connected to the push rod.
Preferably, the first end of the first pipeline is communicated with one end, far away from the first closed space, of the second closed space, and the second end of the first pipeline is communicated with a position, close to the variable diameter, of the second cavity;
the second pipeline leads to a position close to the reducing position in the second cavity.
Preferably, the first cavity and the second cavity are coaxial, and the first piston and the second piston are coaxial.
Optimally, the reducing parts of the first cavity and the second cavity are provided with clapboards, and the clapboards protrude inwards from the reducing parts.
In actual verification, the partition plate can reliably block the first piston or the second piston, and actual verification requirements are met.
Preferably, the partition plate is circular.
Preferably, the first valve and the second valve are electromagnetic valves.
Preferably, the temperature detection mechanism adopts a temperature sensor.
Preferably, the pressure detection mechanism adopts a pressure sensor.
The utility model has the advantages that:
1. the utility model provides an on-site density relay calibration equipment is when practical application, with first cavity, the second cavity sets the diameter different, simultaneously with first piston, the second piston is through same push rod and actuating mechanism drive, and be connected first airtight space and the airtight space of second through first pipeline, and utilize first valve control break-make, when checking up, can realize nimble variable speed through same actuating mechanism, the switching-over, in the load change in-process, stage load change speed is very fast at first, and when the load is close to treating the check point, load change speed diminishes, and then compromise speed and check-up precision when can satisfying actual check-up, and overall structure is simple, high durability and convenient operation, the cost is lower.
2. The alternating current motor is convenient to commutate, long in service life and relatively low in price, and can meet the checking requirement.
3. In actual verification, the partition plate can reliably block the first piston or the second piston, and actual verification requirements are met.
Drawings
Fig. 1 is a schematic diagram of an on-site density relay calibration apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view of a first cylinder in an embodiment of the present invention;
wherein,
a drive mechanism-1;
a push rod-2, a first piston-201 and a second piston-202;
a first cylinder-3;
a first enclosed space-4;
a first valve-5;
a second enclosed space-6;
a first quick-connect port-7;
a temperature detection mechanism-8;
a pressure detection mechanism-9;
a second valve-10;
a gas path interface-11;
a second cylinder-12;
a second quick-connect interface-13.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the field density relay calibration device includes a driving mechanism 1, a push rod 2, a first cylinder 3, a first sealed space 4, a first valve 5, a second sealed space 6, a first quick-plugging port 7, a temperature detection mechanism 8, a pressure detection mechanism 9, a second valve 10, an air path interface 11, a second cylinder 12, a second quick-plugging port 13, and a control unit.
For convenience of description and understanding, the perspective of fig. 1 is taken as a front view perspective, and the directions such as up, down, left and right are analogized based on this perspective, and it should be understood that this orientation is set merely for convenience of description and understanding, and should not be construed as limiting the present invention.
As shown in fig. 1, a first cavity and a second cavity which are communicated with each other are arranged in the first cylinder 3, and the diameters of the first cavity and the second cavity are different; the first cavity is arranged above the second cavity, the first cavity and the second cavity are coaxial, the diameter of the first cavity is smaller than that of the second cavity, the reducing parts of the first cavity and the second cavity are provided with clapboards, the clapboards protrude inwards from the reducing parts, and specifically, the clapboards are circular, namely, the clapboards protrude inwards along the reducing part in the circumferential direction.
As shown in fig. 1, a push rod 2 is slidably arranged in the first cylinder 3, and the axis of the push rod 2 is coaxial with the axis of the first cylinder 3. The device also comprises a driving mechanism 1 which can drive the push rod 2 to reciprocate; the driving mechanism 1 is an alternating current motor, such as an alternating current push rod motor, the alternating current push rod motor is vertically arranged, a telescopic end of the alternating current push rod motor is connected to the lower end of the push rod 2, the alternating current push rod motor can be used for driving the push rod 2 to move, the alternating current push rod motor is controlled by the control unit, in the embodiment, the control unit adopts a PLC, the PLC is the prior art, and a person skilled in the art programs the alternating current push rod motor according to actual requirements, so that the control function in the embodiment can be realized.
As shown in fig. 1, a first piston 201 and a second piston 202 are arranged on the push rod 2, the first piston 201 is in sliding fit with a side wall of a second cavity, the second piston 202 is in sliding fit with a side wall of the first cavity, a space between the first piston 201 and the second piston 202 is a first closed space 4, and a space between the second piston 202 and an inner wall of the first cavity is a second closed space 6; the first piston 201 and the second piston 202 are coaxial.
As shown in fig. 1, the first enclosed space 4 is communicated with the second enclosed space 6 through a first pipeline, a first valve 5 is arranged on the first pipeline, and the first valve 5 is an electromagnetic valve and is controlled by a control unit. The first end of the first pipeline is communicated with one end, far away from the first closed space 4, in the second closed space 6, and the second end of the first pipeline is communicated with a position, close to the variable diameter, in the second cavity;
as shown in fig. 1, the device further comprises a second pipeline communicated to the first closed space 4, the second pipeline is provided with a temperature detection mechanism 8, a pressure detection mechanism 9 and a second valve 10, and the second valve 10 adopts an electromagnetic valve and is controlled by the control unit. The end part of the second pipeline is provided with a gas circuit interface 11; the second pipeline leads to a position close to the reducing position in the second cavity. The temperature detection mechanism 8 adopts a temperature sensor. The pressure detection mechanism 9 adopts a pressure sensor. The temperature sensor and the pressure sensor are both connected to the control unit.
As shown in fig. 1, a second cylinder 12 is further included, and the second cylinder 12 is communicated to the second sealed space 6. The first cylinder 3 is provided with a first quick-plugging port 7 leading to the second closed space 6, the second cylinder 12 is provided with a second quick-plugging port 13, and the first quick-plugging port 7 is connected with the second quick-plugging port 13 through a pipeline.
Example two:
the utility model discloses the process that the check-up was carried out to well adoption above-mentioned on-the-spot density relay calibration equipment does:
A. vacuumizing:
connecting the gas path interface 11 to an external vacuum pumping device, opening the first valve 5 and the second valve 10, starting the vacuum pumping device, controlling the driving mechanism 1 to push the push rod 2, pushing the first piston 201 to the diameter-variable positions of the first cavity and the second cavity, discharging residual gas in the first cylinder 3 from the gas path interface 11, and closing the first valve 5 and the second valve 10;
B. and (3) an air release stage:
closing a valve between a density relay to be checked and an air chamber, connecting an air path interface 11 to an inflation inlet on one side of the density relay to be checked, opening a first valve 5 and a second valve 10, enabling air on one side of the density relay to be checked to flow through the air path interface 11 and the second valve 10 to enter a first closed space 4, then flowing through the first valve 5 to enter a second closed space 6, simultaneously controlling a driving mechanism 1 to drive a push rod 2, and driving a second piston 202 to the reducing positions of a first cavity and a second cavity, wherein the value of the air pressure on one side of the density relay to be checked reaches the minimum value;
C. a boosting stage:
opening a first valve 5 and a second valve 10, communicating a first closed space 4 with a second closed space 6, namely regarding the first closed space 4, the second closed space 6 and a space on one side of the density relay to be checked as a whole, controlling a driving mechanism 1 to drive a push rod 2 to drive a first piston 201 to drive towards the reducing positions of a first cavity and a second cavity, and pressing gas in a first cylinder 3 into the space on one side of the density relay to be checked;
according to the temperature value detected by the temperature detection mechanism 8 and the pressure value detected by the pressure detection mechanism 9, converting the temperature value into a density value, namely a pressure value at 20 ℃, closing the first valve 5 and opening the second valve 10 when the density value rises to be close to the value to be detected, continuously controlling the driving mechanism 1 to drive the push rod 2 to drive the first piston 201 to drive the reducing positions of the first cavity and the second cavity, isolating the second closed space 6 in the process, regarding the first closed space 4 and the space on one side of the density relay to be verified as a whole, and pressing the gas in the first closed space 4 into the space on one side of the density relay to be verified;
after the first valve 5 is closed, the pressure change rate of one side of the density relay to be checked is smaller than that of one side of the density relay to be checked before the first valve 5 is closed;
when the density value reaches the value to be detected, comparing the value displayed by the density relay to be checked with the value to be detected, if the error is within a reasonable range, the density relay is qualified, otherwise, the density relay is not qualified;
during the pressure-increasing stage, the second cylinder 12 and the second closed space 6 are connected during the verification, so that the purpose of adjusting the switching rate of the gas pressure change rate of the space at one side of the density relay to be verified can be achieved;
D. a pressure reduction stage:
opening a first valve 5 and a second valve 10, communicating a first closed space 4 with a second closed space 6, namely regarding the first closed space 4, the second closed space 6 and a space on one side of a density relay to be checked as a whole, and controlling a driving mechanism 1 to drive a push rod 2 to drive a second piston 202 to drive towards the reducing positions of a first cavity and a second cavity;
converting the temperature value detected by the temperature detection mechanism 8 and the pressure value detected by the pressure detection mechanism 9 into a density value, namely a pressure value at 20 ℃, closing the first valve 5 and opening the second valve 10 when the density value is reduced to be close to the value to be detected, continuously controlling the driving mechanism 1 to drive the push rod 2 to drive the second piston 202 to drive the reducing positions of the first cavity and the second cavity, isolating the second closed space 6 in the process, and regarding the first closed space 4 and the space on one side of the density relay to be verified as a whole;
after the first valve 5 is closed, the pressure change rate of one side of the density relay to be checked is smaller than that of one side of the density relay to be checked before the first valve 5 is closed;
when the density value reaches the value to be detected, comparing the value displayed by the density relay to be checked with the value to be detected, if the error is within a reasonable range, the density relay is qualified, otherwise, the density relay is not qualified;
and in the step-down stage, the second cylinder 12 and the second closed space 6 are connected during verification, so that the aim of adjusting the switching rate of the gas pressure change rate of the space at one side of the density relay to be verified can be fulfilled.
The utility model discloses can realize adopting same motor drive, change and treat check-up density relay one side pressure change rate, and then satisfy the required requirement of check-up, its variable speed principle as follows:
a boosting stage:
deriving the gas state equation for time t from the gas state equation PV ═ nRT:
in the formula:
representing that the density relay to be checked detects the numerical value change rate;
representing the change rate of the sum of the volumes of the closed space communicated with the cylinder and the space at one side of the density relay to be verified.
When the first valve 5 and the second valve 10 are opened, the first closed space 4 is communicated with the second closed space 6, that is, the first closed space 4, the second closed space 6 and the space on one side of the density relay to be checked are regarded as a whole, and the driving mechanism 1 is controlled to push the push rod 2 to move upwards at the speed v 1. At the moment, the gas in the first air cylinder 3 is pressed into the space at one side of the density relay to be verified, and the volume V is0The rate of change is the pushrod velocity v1 times the first piston area s 1:
at the moment, the density relay to be verified detects that the pressure value rises at a higher speed. The temperature detection mechanism 8 and the pressure detection mechanism 9 are used for detecting the gas temperature and pressure values in the space at one side of the density relay to be checked, which is communicated with the first closed space 4, and converting the detected pressure values into density values (pressure values at 20 ℃) according to the temperature values, wherein the conversion method is a method known by persons skilled in the art, and when the density values rise to be close to the values to be detected, the first valve 5 is closed, and the second valve 10 is opened.
Continuously controlling the driving mechanism 1 to push the push rod 2 to move upwards at the speed v1, isolating the second closed space 6 in the process, regarding the first closed space 4 and the space on one side of the density relay to be checked as a whole, and pressing the gas in the first closed space 4 into the density to be checked at the momentVolume V in one side space of relay1The rate of change is the push rod velocity v1 multiplied by the difference between the first piston area s1 and the second piston area s 2:
according to formula (1):
the temperature before and after the electromagnetic valve is switched is consistent, and the equations (2) and (3) are divided:
when the pressure and the temperature are consistent with the gas state equation PV ═ nRT, V is in direct proportion to n, and the following results are obtained:
referring to fig. 2, the height h1 of the lower part and the height h2 of the upper part of the first cylinder 3 are respectively, the area of the first piston is s1, the area of the second piston is s2, the push rod has been advanced by a distance c, and the volume of the space on one side of the density relay to be verified is V3. It is known that the total volume V of the space to be communicated is obtained before the first valve 5 is closed0：
V0＝h2×s2+s1×(h1-c)+V3
The total volume V of the connected space after closing the first valve 51：
V1＝c×s2+s1×(h1-c)+V3
In this example, h1 is 5cm, h2 is 10cm, and s1 is 100cm2，s2＝80cm2Then, it can be known that:
it is known that 0. ltoreq. c.ltoreq.5, V3>0, obtaining:
obtaining:
it can be seen that after the first valve 5 is closed, the rate of change of the pressure on the side of the density relay to be verified is smaller than the rate of change of the pressure on the side of the density relay to be verified before the first valve 5 is closed.
Similarly, in the descending process of the push rod 2 pulled by the control driving mechanism 1, the change rate of the gas pressure in the space at one side of the density relay to be checked when the first valve 5 is opened is greater than the change rate of the gas pressure in the space at one side of the density relay to be checked when the first valve 5 is closed.
The first quick-plugging port 7 and the second quick-plugging port 13 are communicated through a pipeline, namely the second cylinder 12 is communicated with the second closed space 6, and then V is formed0Increase of V1The method is not changed, and the purpose of adjusting the switching rate of the gas pressure change rate of the space at one side of the density relay to be verified is achieved.
The utility model provides an on-site density relay calibration equipment is when practical application, with first cavity, the second cavity sets the diameter different, simultaneously with first piston 201, second piston 202 is through same push rod 2 and the drive of actuating mechanism 1, and be connected first airtight space 4 and second airtight space 6 through first pipeline, and utilize first valve 5 control break-make, when carrying out the check-up, can realize nimble variable speed through same actuating mechanism 1, the switching-over, in the load change process, stage load change speed is very fast at first, and when the load is close to treating the check point, load change speed diminishes, and then compromise speed and check-up precision when can satisfying actual check-up, and overall structure is simple, high durability and convenient operation, the cost is lower. The second cylinder 12 can flexibly change the volume proportion of the closed space to adjust the slowing degree of the pressure lifting speed, and can meet the requirements of different sites due to different sizes of the space on one side of the density relay to be verified.
The alternating current motor is convenient to commutate, long in service life and relatively low in price, and can meet the checking requirement. In the actual verification, the partition plate can reliably block the first piston 201 or the second piston 202, so that the actual verification requirement is met. The first quick-plugging port 7 and the second quick-plugging port 13 can be quickly connected and disconnected through pipelines and can be self-sealed when not connected, and actual verification requirements can be well met.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; 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 technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The utility model provides an on-spot density relay calibration equipment which characterized in that: the cylinder comprises a first cylinder (3), wherein a first cavity and a second cavity which are communicated with each other are arranged in the first cylinder (3), and the diameters of the first cavity and the second cavity are different;
the first cylinder (3) is internally provided with a push rod (2) in a sliding manner, and the first cylinder also comprises a driving mechanism (1) capable of driving the push rod (2) to reciprocate;
a first piston (201) and a second piston (202) are arranged on the push rod (2), the first piston (201) is in sliding fit with the side wall of the second cavity, the second piston (202) is in sliding fit with the side wall of the first cavity, the space between the first piston (201) and the second piston (202) is a first closed space (4), and the space between the second piston (202) and the inner wall of the first cavity is a second closed space (6);
the first closed space (4) is communicated with the second closed space (6) through a first pipeline, and a first valve (5) is arranged on the first pipeline;
the device also comprises a second pipeline communicated to the first closed space (4), wherein the second pipeline is provided with a temperature detection mechanism (8), a pressure detection mechanism (9) and a second valve (10), and the end part of the second pipeline is provided with an air passage interface (11).
2. The field density relay calibration device of claim 1, wherein: the driving mechanism (1) adopts an alternating current motor.
3. The field density relay verification device of claim 2, wherein: the driving mechanism (1) adopts an alternating current push rod motor, the axis of the alternating current push rod motor is parallel to the push rod (2), and the telescopic end of the alternating current push rod motor is connected to the push rod (2).
4. The field density relay calibration device of claim 1, wherein: the first end of the first pipeline is communicated with one end, far away from the first closed space (4), in the second closed space (6), and the second end of the first pipeline is communicated with a position, close to the variable diameter, in the second cavity;
the second pipeline leads to a position close to the reducing position in the second cavity.
5. The field density relay calibration device of claim 1, wherein: the first cavity and the second cavity are coaxial, and the first piston (201) and the second piston (202) are coaxial.
6. The field density relay calibration device of claim 1, wherein: the reducing parts of the first cavity and the second cavity are provided with clapboards, and the clapboards protrude inwards from the reducing parts.
7. The field density relay verification device of claim 6, wherein: the baffle is ring-shaped.
8. The field density relay calibration device of claim 1, wherein: the first valve (5) and the second valve (10) both adopt electromagnetic valves.
9. The field density relay calibration device of claim 1, wherein: the temperature detection mechanism (8) adopts a temperature sensor.
10. The field density relay calibration device of claim 1, wherein: the pressure detection mechanism (9) adopts a pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120219397.9U CN214409215U (en) | 2021-01-26 | 2021-01-26 | On-site density relay calibration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120219397.9U CN214409215U (en) | 2021-01-26 | 2021-01-26 | On-site density relay calibration device |
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| CN214409215U true CN214409215U (en) | 2021-10-15 |
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| CN202120219397.9U Active CN214409215U (en) | 2021-01-26 | 2021-01-26 | On-site density relay calibration device |
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- 2021-01-26 CN CN202120219397.9U patent/CN214409215U/en active Active
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