CN207147587U - Purging system for nuclear power station differential pressure measurement - Google Patents
Purging system for nuclear power station differential pressure measurement Download PDFInfo
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- CN207147587U CN207147587U CN201721171711.0U CN201721171711U CN207147587U CN 207147587 U CN207147587 U CN 207147587U CN 201721171711 U CN201721171711 U CN 201721171711U CN 207147587 U CN207147587 U CN 207147587U
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Abstract
The utility model discloses the purging system for nuclear power station differential pressure measurement, when purging one of high-pressure side pressure guiding pipe, corresponding electromagnetism valve events are controlled by controller, by another high-pressure side pressure guiding pipe pressure is provided for differential pressure switch, ensure differential pressure transmitter normal work, controller control is connected on the electromagnetism valve events on the gassing pipe between air blowing type device source of the gas and high-pressure side pressure guiding pipe to be purged, purged, pass through purging, the data of differential pressure transmitter measurement are not in virtual height phenomenon, it is more accurate, meet a variety of demands at scene, it is practical, construction value is higher.
Description
Technical field
Purging control technology field is the utility model is related to, more particularly to the purging system for nuclear power station differential pressure measurement
System.
Background technology
Contain boric acid in caused waste liquid in nuclear power station, the liquid level of waste liquid, air blowing type gas are measured using differential pressure transmitter
Source is the source of the gas that must have when differential pressure transmitter works, when measuring the liquid level of waste liquid because positive pressure side gauge pipe is insertion boron
In acid waste liquid, it is easy to cause positive pressure side instrument blockage, after instrument blockage the increase of malleation lateral pressure cause liquid level virtual height, after
And cause the measurement to the liquid level of waste liquid not accurate enough.
In a word, boric acid liquid gasification in positive pressure side gauge pipe when being measured in the prior art for waste liquid in nuclear power station measurement tank
Caused by crystallization the problem of measurement data inaccuracy, still lack effective solution.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides the purging system for nuclear power station differential pressure measurement,
The utility model increases source purge gas newly on the basis of original blowning installation, and the control to source purge gas is realized using controller
System so that the measurement accuracy of differential pressure transmitter is high.
For the purging system of nuclear power station differential pressure measurement, including it is connected on air blowing type device source of the gas and three high-pressure side impulses
The 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve on gassing pipe between pipe, the 7th magnetic valve, the 8th electromagnetism
Valve, the 9th magnetic valve are connected by purging pipeline with source purge gas；
The 4th magnetic valve is in series with pipeline between first differential pressure switch and the 3rd high-pressure side pressure guiding pipe, the second differential pressure is opened
Close and be in series with the 5th magnetic valve, differential pressure transmitter and the first high-pressure side pressure guiding pipe on the pipeline between the second high-pressure side pressure guiding pipe
Between pipeline on be in series with the 6th magnetic valve, the 4th magnetic valve is additionally coupled to differential pressure transmitter and the first high-pressure side impulse
On pipeline between pipe, the 5th magnetic valve is additionally attached on the pipeline where the 6th magnetic valve, the 6th electromagnetism
Valve is additionally attached on the pipeline where the 5th magnetic valve；
Above-mentioned magnetic valve is connected with controller, when purging one of high-pressure side pressure guiding pipe, is controlled by controller
Corresponding electromagnetism valve events, pressure is provided by another high-pressure side pressure guiding pipe for differential pressure switch, it is ensured that differential pressure transmitter normal work,
Controller control is connected on the electromagnetism valve actuation on the gassing pipe between air blowing type device source of the gas and high-pressure side pressure guiding pipe to be purged
Make, purged.
Further, during the first high-pressure side pressure guiding pipe blowing, controller controls the 6th electromagnetism valve events, and differential pressure becomes
Device side impulse source of the gas is sent to switch to the first high-pressure side pressure guiding pipe side, after setting time, controller controls the 7th electromagnetism valve events, the
One high-pressure side pressure guiding pipe side supply source of the gas switches to source purge gas, is purged.
Further, when the first high-pressure side pressure guiding pipe blowing exits, controller controls the 7th electromagnetism valve events, the
One high-pressure side pressure guiding pipe side supply source of the gas switches to air blowing type device source of the gas, when the first high-pressure side impulse overpressure can be normally anti-
Answer in tank after hydraulic pressure, controller controls the 6th electromagnetism valve events, and differential pressure transmitter side impulse source of the gas switches to the first high-pressure side and drawn
Pressure pipe side.
Further, during the second high-pressure side pressure guiding pipe blowing, controller controls the 5th electromagnetism valve events, with second
Pressure guiding pipe connected differential pressure switch side impulse source of the gas in high-pressure side switches to the first high-pressure side pressure guiding pipe side, after setting time, control
Device controls the 8th electromagnetism valve events, and the second high-pressure side pressure guiding pipe side supply source of the gas switches to source purge gas, purged.
Further, when the second high-pressure side pressure guiding pipe blowing exits, controller controls the 8th electromagnetism valve events, the
Two high-pressure sides pressure guiding pipe side supply source of the gas switches to air blowing type device source of the gas, when the second high-pressure side impulse overpressure can be normally anti-
Answer in tank after hydraulic pressure, controller controls the 5th electromagnetism valve events, and differential pressure switch side impulse source of the gas switches to the second high-pressure side impulse
Pipe side.
Further, during the 3rd high-pressure side pressure guiding pipe blowing, controller controls the 4th electromagnetism valve events, with the 3rd
Pressure guiding pipe connected differential pressure switch side impulse source of the gas in high-pressure side switches to the first high-pressure side pressure guiding pipe side, after setting time, control
The electromagnetism valve events of device the 9th, the 3rd high-pressure side pressure guiding pipe side supply source of the gas switch to source purge gas, purged.
Further, when the 3rd high-pressure side pressure guiding pipe blowing exits, controller controls the 9th electromagnetism valve events, the
Three high-pressure sides pressure guiding pipe side supply source of the gas switches to air blowing type device source of the gas, when the 3rd high-pressure side impulse overpressure can be normally anti-
Answer in tank after hydraulic pressure, controller controls the 4th electromagnetism valve events, the differential pressure switch side impulse being connected with the 3rd high-pressure side pressure guiding pipe
Source of the gas switches to the 3rd high-pressure side pressure guiding pipe.
Further, the air blowing type device source of the gas is drawn by the high-pressure side of filtering pressure reducing valve group and differential pressure transmitter respectively
Pressure pipe and low-pressure side pressure guiding pipe are connected.
Further, the differential pressure transmitter first end is connected with the 3rd magnetic valve, the end of differential pressure transmitter second with
Second solenoid valve is connected, and the first electromagnetism is also associated between the pipeline where the 3rd magnetic valve and the pipeline where second solenoid valve
Valve.
For the blowing method of nuclear power station differential pressure measurement, comprise the following steps：
Step 1：First high-pressure side pressure guiding pipe side is that HP1 blowings start：Controller controls the 6th electromagnetism valve events,
3051C sides impulse source of the gas switches to the second high-pressure side pressure guiding pipe side, and after setting time, controller controls the 7th electromagnetism valve events,
HP1 sides supply source of the gas switches to source purge gas；
Step 2：HP1 blowings exit：Controller controls the 7th electromagnetism valve events, and HP1 sides supply source of the gas switches to air blowing
Formula device source of the gas, after hydraulic pressure in pressure energy normal reaction tank in HP1, controller controls the 6th electromagnetism valve events, differential pressure transporting
Device side impulse source of the gas switches to HP1 sides, and HP1 blowings are performed and exited；
Step 3：Second high-pressure side pressure guiding pipe side is that HP2 blowings start：Controller controls the 5th electromagnetism valve events：The
Differential pressure switch side impulse source of the gas corresponding to two high-pressure side pressure guiding pipes switches to HP1 sides, after setting time, the electricity of controller control the 8th
Magnet valve acts, and HP2 sides supply source of the gas switches to source purge gas；
Step 4：HP2 blowings exit：8th electromagnetism valve events, HP2 sides supply source of the gas switch to air blowing type device gas
Source, after hydraulic pressure in pressure energy normal reaction tank in HP2, controller controls the 5th electromagnetism valve events, corresponding differential pressure switch side
Impulse source of the gas switches to HP2 sides, and HP2 blowings are performed and exited；
Step 5：3rd high-pressure side pressure guiding pipe side is that HP3 blowings start：Controller controls the 4th electromagnetism valve events：It is right
The differential pressure switch side impulse source of the gas answered switches to HP1 sides, the 9th electromagnetism valve events after setting time, the supply source of the gas switching of HP3 sides
To source purge gas；
Step 6：HP3 blowings exit：9th electromagnetism valve events, HP3 sides supply source of the gas switch to air blowing type device gas
Source, after hydraulic pressure in pressure energy normal reaction tank in HP3, the 4th electromagnetism valve events, corresponding differential pressure switch side impulse source of the gas is cut
HP3 sides are shifted to, HP3 blowings are performed and exited.
Further, purge keeps setting time when the HP1 blowings, HP2 blowings and HP3 blowings.
Further, the above-mentioned blowing method for nuclear power station differential pressure measurement can periodically be blown automatically by the control of controller
Sweep.
Further, the above-mentioned blowing method for nuclear power station differential pressure measurement can self-test fluctuation purging, i.e., by differential pressure transporting
Device isolates all the way that signal is to controller, when liquid level amount of increase then performs purging automatically more than setting value in the unit interval.
Further, the above-mentioned blowing method for nuclear power station differential pressure measurement can realize hand-operated forced purging, on cabinet
Reserved switching push button, after switching, press the first purging Action Button on control cabinet：Then HP1 sides purge for a long time, until pressing
Dynamic ESC Escape, the second purging Action Button on control cabinet is pressed, then HP2 sides purge for a long time, until pressing ESC Escape, press
3rd purging Action Button, then HP3 sides purge for a long time, until pressing ESC Escape.
Compared with prior art, the beneficial effects of the utility model are：
1st, newly-increased source purge gas is realized on the premise of the work of air blowing type device source of the gas is not influenceed, when purging differential pressure transmitter
The road high-pressure side (such as HP1) when, the high-pressure side of differential pressure transmitter can be by another way high-pressure side (HP2) impulse, so as to not shadow
Ring differential pressure transmitter measurement.
2nd, the purging system has a variety of purging schemes, and by purging, the data of differential pressure transmitter measurement are not in void
High phenomenon, more accurately, meet a variety of demands at scene, practical, construction value is higher.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the sub- electrical connection diagram of the utility model first embodiment；
In figure, the 1, first magnetic valve, 2, second solenoid valve, the 3, the 3rd magnetic valve, the 4, the 4th magnetic valve, the 5, the 5th electromagnetism
Valve, the 6, the 6th magnetic valve, the 7, the 7th magnetic valve, the 8, the 8th magnetic valve, the 9, the 9th magnetic valve, HP1, HP2, HP3 draw for high-pressure side
Pressure pipe high-pressure side, LP1, LP23 are low-pressure side pressure guiding pipe low-pressure side.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, positive pressure side instrument when waste liquid measurement in nuclear power station measurement tank in the prior art be present
The inaccurate deficiency of measurement data caused by the crystallization of boric acid liquid gasification in pipe, in order to solve technical problem as above, the application
Propose the purging system for nuclear power station differential pressure measurement.
When the waste liquid of nuclear power station discharge carries out level gauging, it is necessary to differential pressure transmitter, in the present embodiment, differential pressure transporting
The model 3051C of device, be measurement liquid level, also two differential pressure switch model DMABV96.Air blowing type device source of the gas is poor
Must have source of the gas during pressure transmitter work, not have blow device when differential pressure transmitter works at present, it is necessary to manually carry out
Boric acid liquid gasification crystallization in positive pressure side gauge pipe is cleared up, normal work and the manual cleaning for influenceing differential pressure transmitter are relatively more tired
It is difficult.
In a kind of typical embodiment of the application, as shown in figure 1, the purging system for nuclear power station differential pressure measurement,
Including source purge gas, be in series with respectively in the blowing pipe being connected with the high-pressure side pressure guiding pipe of differential pressure transmitter the 7th magnetic valve 7,
8th magnetic valve 8, the 9th magnetic valve 9, the 7th magnetic valve 7, the 8th magnetic valve 8, the 9th magnetic valve 9 are connected to purge gass
Source；
Air blowing type device source of the gas is respectively connecting to the high-pressure side pressure guiding pipe and low-pressure side of differential pressure transmitter by blowing pipe
Pressure guiding pipe, high-pressure side pressure guiding pipe three, low-pressure side pressure guiding pipe two.
Differential pressure transmitter first end is connected to the first low-pressure side pressure guiding pipe, and the end of differential pressure transmitter second is connected to the first high pressure
Side pressure guiding pipe, is connected with the 6th magnetic valve 6 on the pipeline where the end of differential pressure transmitter second and the first high-pressure side pressure guiding pipe, and second
Low-pressure side pressure guiding pipe is connected with two differential pressure switch one end, and the other end of two differential pressure switches is respectively connecting to the second high-pressure side and drawn
Pressure pipe and the second high-pressure side pressure guiding pipe.
The 5th magnetic valve 5, the 3rd high-pressure side pressure guiding pipe are in series between second high-pressure side pressure guiding pipe and place differential pressure switch
Be in series with the 4th magnetic valve 4 between side and place differential pressure switch side, the 4th magnetic valve 4 be additionally coupled to the end of differential pressure transmitter second with
On pipeline between first high-pressure side pressure guiding pipe, the 5th magnetic valve 5 is additionally attached on the pipeline at the place of the 6th magnetic valve 6,
6th magnetic valve 6 is additionally attached on the pipeline at the place of the 5th magnetic valve 5；
Above-mentioned magnetic valve is connected with controller, and the switching of magnetic valve is realized by the control of controller.
Air blowing type device source of the gas passes through filtering pressure reducing valve group and the high-pressure side pressure guiding pipe and low-pressure side of differential pressure transmitter respectively
Pressure guiding pipe is connected.
Differential pressure transmitter first end is connected with the 3rd magnetic valve, the end of differential pressure transmitter second and the phase of second solenoid valve 2
Even, it is also associated with the first magnetic valve 1 between the pipeline where the 3rd magnetic valve 3 and the pipeline where second solenoid valve.
The application increases the effect of valve newly：
The high-pressure side pressure guiding pipe induction pathway of differential pressure switch where the control of 4th magnetic valve 4, right side UNICOM HP1 all the way, one
Road UNICOM HP3, is not crystallized under i.e. normal operating conditions, from HP1 sides impulse from HP3 impulses, purge.
The high-pressure side pressure guiding pipe induction pathway of differential pressure switch where the control of 5th magnetic valve 5, right side UNICOM HP1 all the way, one
Road UNICOM HP2, under normal operating conditions, from HP1 sides impulse from HP2 impulses, purge.
6th magnetic valve 6 control differential pressure transmitter 3051C high-pressure side pressure guiding pipe induction pathway, right side UNICOM HP1 all the way,
UNICOM HP2 all the way, under normal operating conditions, from HP2 sides impulse from HP1 impulses, purge.
7th magnetic valve 7, the source of the gas that control enters in HP1 pipelines, right side UNICOM's air blowing type device source of the gas all the way, join all the way
Lead to source purge gas, entering row line from air blowing type device source of the gas under normal operating conditions supplies.
8th magnetic valve 8, the source of the gas that control enters in HP2 pipelines, right side UNICOM's air blowing type device source of the gas all the way, join all the way
Lead to source purge gas, entering row line from air blowing type device source of the gas under normal operating conditions supplies.
9th magnetic valve 9, the source of the gas that control enters in HP3 pipelines, right side UNICOM's air blowing type device source of the gas all the way, join all the way
Lead to source purge gas, entering row line from air blowing type device source of the gas under normal operating conditions supplies.
Disclosed herein as well is another examples of implementation, for the purging system for nuclear power station differential pressure measurement, including following step
Suddenly：
HP1 blowings start：6th electromagnetism valve events, 3051C sides impulse source of the gas switch to HP2 sides, and it is differential pressure to have HP2 sides
Transmitter provides high pressure, does not influence the work of differential pressure transmitter, and after 2s, the 7th electromagnetism valve events, HP1 sides supply source of the gas switches to
Source purge gas；Purge keeps 30S (set, live can adjust according to the actual requirements, open regulation window on control panel)；
HP1 blowings exit：7th electromagnetism valve events, HP1 sides supply source of the gas switch to air blowing type device source of the gas, and 5S (is needed
Consider grace time, hydraulic pressure in pressure energy normal reaction tank in HP1) after, the 6th electromagnetism valve events, 3051C sides impulse source of the gas
Switch to HP1 sides；
HP1 blowings are performed and exited；
HP2 blowings start:5th electromagnetism valve events：DMABV96 sides impulse source of the gas switches to HP1 sides, and the 8th is electric after 2S
Magnet valve acts, and HP2 sides supply source of the gas switches to source purge gas；Purge holding 30S (set according to the actual requirements, can scene
Adjust, open regulation window on control panel)；
HP2 blowings exit：8th electromagnetism valve events, HP2 sides supply source of the gas switch to air blowing type device source of the gas, and 5S (is needed
Consider grace time, hydraulic pressure in pressure energy normal reaction tank in HP2) after, the 5th electromagnetism valve events, differential pressure switch DMABV96
Side impulse source of the gas switches to HP2 sides；
HP2 blowings are performed and exited；
HP3 blowings start:4th electromagnetism valve events：DMABV96 sides impulse source of the gas switches to HP1 sides, and the 9th is electric after 2S
Magnet valve acts, and HP3 sides supply source of the gas switches to source purge gas；Purge holding 30S (set according to the actual requirements, can scene
Adjust, open regulation window on control panel)；
HP3 blowings exit：9th electromagnetism valve events, HP3 sides supply source of the gas switch to air blowing type device source of the gas, and 5S (is needed
Consider grace time, hydraulic pressure in pressure energy normal reaction tank in HP3) after, the 4th electromagnetism valve events, differential pressure switch DMABV96
Side impulse source of the gas switches to HP3 sides；
HP3 blowings are performed and exited.
Flowed to and switched by control valve in above-mentioned purge；Switching is exactly to work as the high-pressure side on the purging road (such as
When HP1), the high-pressure side of differential pressure transmitter can be by another way high-pressure side (HP2) impulse, so as to not influence differential pressure transmitter measurement；
Magnetic valve has two flow directions, acts and becomes to flow to B by A to flow to C by A, and using two-bit triplet magnetic valve, simply two flow directions are cut
Change.
In the application another embodiment, purging strategy：Regular automatic blowing：(set at regular intervals according to field demand
Put, can site setup, it is open that window is set) the automatic sweeping process performed above.
In the application another embodiment, purging strategy：Self-test fluctuation purging：By differential pressure transmitter isolate all the way signal to
Processor is analyzed, when liquid level amount of increase then performs more than Xcm sweeping process above automatically in the unit interval.
In the application another embodiment, purging strategy：Hand-operated forced purging, switching push button is reserved on cabinet, after switching,
Two above purging program is no longer performed, presses the first purging Action Button on control cabinet：Then HP1 sides purge for a long time,
Until pressing ESC Escape, the second purging Action Button on control cabinet is pressed, then HP2 sides purge for a long time, are moved back until pressing
Go out key, by the 3rd Action Button of purging, then HP3 sides purge for a long time, until ESC Escape is pressed, three circuits, while can only
Execution purges all the way.
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (3)
1. for the purging system of nuclear power station differential pressure measurement, it is characterized in that, including it is connected on air blowing type device source of the gas and three height
The 7th magnetic valve on gassing pipe, the 8th magnetic valve, the 9th magnetic valve between pressure side pressure guiding pipe, the 7th magnetic valve,
8th magnetic valve, the 9th magnetic valve are connected by purging pipeline with source purge gas；
Be in series with the 4th magnetic valve on pipeline between first differential pressure switch and the 3rd high-pressure side pressure guiding pipe, the second differential pressure switch with
The 5th magnetic valve is in series with pipeline between second high-pressure side pressure guiding pipe, between differential pressure transmitter and the first high-pressure side pressure guiding pipe
Pipeline on be in series with the 6th magnetic valve, the 4th magnetic valve be additionally coupled to differential pressure transmitter and the first high-pressure side pressure guiding pipe it
Between pipeline on, the 5th magnetic valve is additionally attached on the pipeline where the 6th magnetic valve, and the 6th magnetic valve is also
It is connected on the pipeline where the 5th magnetic valve；
Above-mentioned magnetic valve is connected with controller.
2. it is used for the purging system of nuclear power station differential pressure measurement as claimed in claim 1, it is characterized in that, the air blowing type device gas
Source is connected by filtering pressure reducing valve group with the high-pressure side pressure guiding pipe and low-pressure side pressure guiding pipe of differential pressure transmitter respectively.
3. it is used for the purging system of nuclear power station differential pressure measurement as claimed in claim 1 or 2, it is characterized in that, the differential pressure transporting
Device first end is connected with the 3rd magnetic valve, and the end of differential pressure transmitter second is connected with second solenoid valve, where the 3rd magnetic valve
Pipeline and second solenoid valve where pipeline between be also associated with the first magnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721171711.0U CN207147587U (en) | 2017-09-13 | 2017-09-13 | Purging system for nuclear power station differential pressure measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721171711.0U CN207147587U (en) | 2017-09-13 | 2017-09-13 | Purging system for nuclear power station differential pressure measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207147587U true CN207147587U (en) | 2018-03-27 |
Family
ID=61667283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721171711.0U Active CN207147587U (en) | 2017-09-13 | 2017-09-13 | Purging system for nuclear power station differential pressure measurement |
Country Status (1)
| Country | Link |
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| CN (1) | CN207147587U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764361A (en) * | 2017-09-13 | 2018-03-06 | 美核电气（济南）股份有限公司 | Purging system and method for nuclear power station differential pressure measurement |
| CN111693107A (en) * | 2019-03-12 | 2020-09-22 | 上海梅山钢铁股份有限公司 | Multifunctional probe combination device of power bar flowmeter |
-
2017
- 2017-09-13 CN CN201721171711.0U patent/CN207147587U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764361A (en) * | 2017-09-13 | 2018-03-06 | 美核电气（济南）股份有限公司 | Purging system and method for nuclear power station differential pressure measurement |
| CN107764361B (en) * | 2017-09-13 | 2024-04-30 | 美核电气（济南）股份有限公司 | Purging system and method for differential pressure measurement of nuclear power station |
| CN111693107A (en) * | 2019-03-12 | 2020-09-22 | 上海梅山钢铁股份有限公司 | Multifunctional probe combination device of power bar flowmeter |
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| CP02 | Change in the address of a patent holder |
Address after: 250101 1610, room sixteen, 5 building, Qisheng mansion 1666, Ji'nan new high tech Zone, Shandong. Patentee after: US nuclear electric (Ji'nan) Limited by Share Ltd Address before: 250101 building 3, Orson mansion 1166, Xinjie street, Ji'nan high tech Zone, Shandong, China. Patentee before: US nuclear electric (Ji'nan) Limited by Share Ltd |
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| CP02 | Change in the address of a patent holder |