CN207436196U - A kind of device on pipeline - Google Patents

A kind of device on pipeline Download PDF

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Publication number
CN207436196U
CN207436196U CN201721290603.5U CN201721290603U CN207436196U CN 207436196 U CN207436196 U CN 207436196U CN 201721290603 U CN201721290603 U CN 201721290603U CN 207436196 U CN207436196 U CN 207436196U
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China
Prior art keywords
liquid level
valve
measurement pipe
pipeline
level gauge
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CN201721290603.5U
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Chinese (zh)
Inventor
刘勇
余林波
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Wuhan Shengyu Drainage Systems Co Ltd
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Wuhan Shengyu Drainage Systems Co Ltd
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Abstract

The utility model discloses a kind of device on pipeline, described device a whole set of can configure and carry out prefabricated, simple in structure, saving construction and equipment cost, be greatly reduced the input of labour.Described device can also realize remote control and monitoring, by monitoring the liquid level difference of upstream water body and downstream water in real time come the folding size of control valve, it can be achieved that double liquid level flow control or reverse-filling.Described device can realize flow control, it is that the flow for flowing through the pipeline is calculated in the liquid level difference of the downstream water liquid level of the upper water body fluid position and second liquid level gauge monitoring monitored by first liquid level gauge, and the flow monitoring of water body can be realized without reusing flowmeter.

Description

A kind of device on pipeline
Technical field
The utility model belongs to flow control and technical field of drainage, and in particular to a kind of device on pipeline.
Background technology
Flow refers in the unit interval through the material quantity in a certain section, i.e. instantaneous delivery.In modern industrial production mistake Cheng Zhong, flow are one of important procedure parameters, are the efficiency of weighing device and the important indicator of economy, be production operation and The foundation of control because in most of industrial productions, commonly uses measurement and control flow to determine the proportioning of material and consumption, real Existing Automation of Manufacturing Process and optimized control;While in order to carry out business accounting, it is also necessary to know the medium total amount flowed through.Institute With measurement and the control of flow are to realize a vital task of industrial processes.
The species of flow-measuring method and instrument is various, and sorting technique is also very much, and for different application fields, it is right Also different in the requirement of used flow-measuring method and instrument, i.e., each flow-measuring method and instrument all have specific Applicability also has its limitation.
In water inlet and/or outlet pipeline system in the municipal sewerage engineering in China, for the discharge of sewage control into For an important field of research, by the control to the discharge of sewage in pipe-line system, regulate and control at any time each in pipe-line system Valve and associated component realize the smooth discharge of water body, avoid various flood and waterlogs caused by being discharged not in time due to rainwater is excessive Evil.
In current pipe-line system, common flow controller is installs all kinds of flowmeters in pipeline, but it is faced So complicated huge pipe-line system is, it is necessary to the quantity of the flowmeter of installation certainly will be quite a few, and the structure of most flowmeters Complexity, it is bulky, it installs and debugs more complicated, and be difficult to repair;Most of instrument and meter is only intended to clean list Phase liquid is not particularly suited for sewage and rainwater common in pipe-line system, may also have some solid suspensions etc.;Most pipes Need not be especially accurate for the control of flow in the system of road, if using to the more stringent flowmeter of required precision, it is also inevitable Cause procurement price high, the appearance for the various problems such as investment is larger, and operation and maintenance cost is higher.
Further more, the applicable surface of existing volume control device is relatively narrow, generally it is only capable of using as flow control, exploitation has More multi-functional volume control device is that existing drainage system is badly in need of.
Utility model content
In order to improve the deficiencies in the prior art, the utility model provides a kind of device on pipeline, described device It can be used for measurement and flow through the flow of the pipeline, described device can be also used for reverse-filling, dexterously by flow control and anti- Pour in down a chimney with reference within one device, be very suitable for the demand of existing drainage system.
The utility model provides following technical solution:
A kind of device on pipeline, described device include first liquid level gauge, second liquid level gauge and mounted on pipelines On the first measurement pipe, valve and the second measurement pipe;
First measurement pipe and the second measurement pipe are arranged on pipeline, and with the pipeline connection;
The valve is on the pipeline between first measurement pipe and the second measurement pipe;
First measurement pipe is located at the entrance side of the valve, and second measurement pipe is located at the outlet of the valve Side;
The first liquid level gauge, for detecting the liquid level of the upstream water body in first measurement pipe;
The second liquid level gauge, for detecting the liquid level of the downstream water in second measurement pipe.
According to the utility model, first measurement pipe is arranged at the second measurement pipe on the pipeline parallel.
According to the utility model, described device further includes controller, the controller respectively with the first liquid level gauge, institute Second liquid level gauge is stated to connect with valve signal, for receiving the liquid level signal of the first liquid level gauge and second liquid level gauge monitoring, And the aperture of the valve is controlled according to the liquid level signal.
According to the utility model, the first liquid level gauge is arranged in the first measurement pipe, and the second liquid level gauge is arranged on In second measurement pipe.
According to the utility model, the setting height(from bottom) of the first liquid level gauge and the second liquid level gauge is not less than 0.5 meter.Institute Stating setting height(from bottom) refers to liquid level gauge to the vertical height of pipeline.
According to the utility model, first measurement pipe and second measurement pipe are each perpendicular to the pipeline and set.
According to the utility model, first measurement pipe and the distance between second measurement pipe and the valve are little In 10 meters.
According to the utility model, described device further includes a well body, and the valve is arranged in well body, it is easy to operation and Repair.
According to the utility model, first measurement pipe can be located in well body, can also be located at well body upstream end, preferably In well body, easy to operation and repair.
According to the utility model, second measurement pipe can be located in well body, can also be located at well body downstream, preferably In well body, easy to operation and repair.
According to the utility model, the valve is selected from gate valve, ball valve, butterfly valve, diamond valve, V-arrangement valve, rubber clack shut off non-return At least one of valve.
According to the utility model, the type of drive of the valve can be used it is electronic, surge or pneumatically.
The utility model also provides a kind of pipe-line system, and the pipe-line system includes the above-mentioned device being used in pipeline.
According to the utility model, the pipe-line system further includes pipeline, that is, installs first measurement pipe, the second measurement pipe And the pipeline of valve.
The utility model also provides the purposes of above device, the reverse-filling being used on pipeline.
Preferably, the reverse-filling on section dirty pipe.
Preferably, the reverse-filling in shunting well sections of dirty pipe.
The utility model also provides the purposes of above device, the flow control being used on pipeline.
Preferably, the flow control on section dirty pipe.
Preferably, the flow control in shunting well sections of dirty pipe.
The utility model also provides a kind of double liquid level flow control methods on pipeline, and the method is based on above-mentioned For the device on pipeline, described method includes following steps:
1) the liquid level H of upstream water body is monitored1With the liquid level H of downstream water2
2) liquid level difference (H of upstream water body and downstream water is determined1-H2) and the valve opening S and flow Q for flowing through pipeline Relational expression is as follows:
In formula,
S --- valve opening (discharge area in valve) (m2);
H1--- the liquid level (m) of the upstream water body of first liquid level gauge monitoring;
H2--- the liquid level (m) of the downstream water of second liquid level gauge monitoring;
σs--- flood coefficient;
G --- acceleration of gravity (m/s2);
M --- the discharge coefficient of free overflow, it is related with the boundary conditions such as pipeline;
σc--- side constriction coefficient reflects the cross-direction shrinkage due to pipeline, reduces effective overcurrent width and increased office Influence of portion's energy loss to discharge capacity;
Influence of the relative opening degree of μ --- the discharge coefficient of pipeline free discharge, reflection pipeline and valve to vent flow;
3) liquid level difference of upstream water body and downstream water based on monitoring and the relational expression, pass through controlling opening of valve To realize the control for the flow for flowing through pipeline.
According to the utility model, in the relational expression, σsTo flood coefficient, with liquid level difference (H1-H2) related, it can be direct It tables look-up to obtain.
According to the utility model, in the relational expression, K is set coefficient, as liquid level difference (H1-H2) determine after, K is also true Fixed value.
According to the utility model, in the relational expression, the parameter is by definite related coefficient of tabling look-up, and root when in use It is modified according to actual conditions;Alternatively, according to actual measured value, relational expression is directly utilized Middle proportionate relationship determines the set COEFFICIENT K of related coefficient, such as when front and rear liquid level difference determines, σsCan table look-up acquisition;Soil One timing of foundation structure and size, equipment installation dimension and position is built, K is definite value;Therefore, by monitor first liquid level gauge and Liquid level difference (the H of second liquid level gauge1-H2) and valve opening S, you can calculate the flow Q for flowing through pipeline.
According to the utility model, the double liquid level flow control methods are used for the flow control of pipeline.
According to the utility model, the double liquid level flow control methods are for a section flow control for dirty pipe.
According to the utility model, the double liquid level flow control methods are used in shunting well cut the flow control of dirty pipe.
According to the utility model, the double liquid level flow control methods further include following steps:
According to cutting the downstream line treatable maximum stream flow of institute that dirty pipe is connected or managing the downstream wastewater being connected with cutting a dirt The treatable maximum stream flow setting flow Q1 of institute for the treatment of plant;
A) during fine day, when flowing through the flow for cutting dirty pipe less than setting flow Q1, valve is shown in a fully open operation, and dry flow sewage is complete Portion, which flows into, to be cut in dirty pipe;
B) during the rainy day, judge that rainfall at this time is initial rainwater or middle and later periods rainwater;If initial rainwater, following steps are performed Rapid b-1);If middle and later periods rainwater, following step b-2 is performed);
B-1) during initial rainwater, when flowing through the flow for cutting dirty pipe less than setting flow Q1, valve is shown in a fully open operation;
When flowing through the flow for cutting dirty pipe higher than setting flow Q1, the aperture of control valve is realized to flow into and cuts dirt Guan Zhongshui The accurate control of body;
B-2) during middle and later periods rainwater, valve is in full off state, and water body is all flowed into natural water.
In the utility model, the initial rainwater refers to that, containing a large amount of pollutants, water quality is not reaching to discharge standard Water body, to the rainwater to rain in lasting 5-30min when generally beginning to rain;The middle and later periods rainwater refers to that water quality reaches row Put the water body of standard.
The utility model also provides a kind of method of reverse-filling, and the method is for the dress on pipeline based on above-mentioned It puts;The anti-down irrigation method includes the following steps:
1) the water body level value of valve inlet side and outlet side is monitored respectively by first liquid level gauge and second liquid level gauge, point H is not denoted as it1And H2
2) the water body level value H monitored by first liquid level gauge1With the water body level value H of second liquid level gauge monitoring2Size Judged:
Work as H1-H2More than zero or H2-H1During less than zero, valve is shown in a fully open operation, and the water body of valve inlet side flows to valve Outlet side;
Work as H1-H2Equal to zero or H2-H1During equal to zero, the aperture of control valve to H1-H2More than zero or H2-H1Equal to zero, keep away The water body for exempting from valve export side pours in down a chimney;And
Work as H1-H2Less than zero or H2-H1During more than zero, valve is in full off state, and the water body of valve export side is avoided to occur Pour in down a chimney.
Preferably, the method is the reverse-filling for cutting on dirty pipe.
Preferably, the method is the reverse-filling for cutting on dirty pipe in shunting well.
The beneficial effects of the utility model:
(1) control that piping flow can be realized for the device on pipeline of the utility model, can also realize pipeline The monitoring of reverse-filling, a whole set of can configure and carry out it is prefabricated, it is simple in structure, save and build and equipment cost, also drop significantly The input of low labour.
(2) device being used on pipeline of the utility model can also realize remote control and monitoring, by monitoring in real time The liquid level difference of upstream water body and downstream water carrys out the folding size of control valve, it can be achieved that double liquid level flow control or anti-down It fills.
(3) the utility model for the double liquid level flow control on pipeline is based on parallel arrangement of first in pipeline Measurement pipe and the second measurement pipe and be installed on first liquid level gauge and second liquid level gauge therein, pass through first liquid level gauge monitor it is upper The flow for flowing through the pipeline is calculated in the liquid level difference of the downstream water liquid level of swimming body fluid position and second liquid level gauge monitoring, without It needs to reuse the flow monitoring that water body can be realized in flowmeter.
(4) the utility model is simple, easily operated for the double liquid level flow control methods on pipeline, can also realize Remote control and monitoring control the folding size of flow control valve, realization pair by monitoring the liquid level difference of double liquid level in real time The control of water body in pipeline.
Description of the drawings
Fig. 1 is the front view of the device described in one preferred embodiment of the utility model;
Wherein, 1- upstreams, the first measurement pipes of 2-, 3- first liquid level gauges, 4- well bodies, 5- second liquid level gauges, 6- second Measurement pipe, 7- downstream pipes, 8- valves.
Specific embodiment
With reference to specific embodiment, the utility model is expanded on further.It is to be understood that these embodiments are merely to illustrate this Utility model rather than limitation the scope of the utility model.Furthermore, it is to be understood that it is reading in recorded in the utility model After appearance, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Utility model limited range.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of device on pipeline, described device includes first liquid level gauge, the Two liquid level gauges and the first measurement pipe, valve and the second measurement pipe on pipeline;
First measurement pipe and the second measurement pipe are arranged on pipeline, and with the pipeline connection;
The valve is on the pipeline between first measurement pipe and the second measurement pipe;
First measurement pipe is located at the entrance side of the valve, and second measurement pipe is located at the outlet of the valve Side;
The first liquid level gauge, for detecting the liquid level of the upstream water body in first measurement pipe;
The second liquid level gauge, for detecting the liquid level of the downstream water in second measurement pipe.
In a preferred embodiment of the utility model, first measurement pipe is arranged at parallel with the second measurement pipe On the pipeline.
In a preferred embodiment of the utility model, described device further includes controller, the controller difference It is connected with the first liquid level gauge, the second liquid level gauge and valve signal, for receiving the first liquid level gauge and the second liquid The liquid level signal of position meter monitoring, and according to the aperture of the liquid level signal control valve.
In a preferred embodiment of the utility model, the first liquid level gauge is arranged in the first measurement pipe, institute Second liquid level gauge is stated to be arranged in the second measurement pipe.
In a preferred embodiment of the utility model, the installation of the first liquid level gauge and the second liquid level gauge Highly it is not less than 0.5 meter.The setting height(from bottom) refers to liquid level gauge to the vertical height of pipeline.
In a preferred embodiment of the utility model, first measurement pipe and second measurement pipe are vertical It is set in the pipeline.
In a preferred embodiment of the utility model, first measurement pipe and second measurement pipe with it is described The distance between valve is not more than 10 meters.
In a preferred embodiment of the utility model, described device further includes a well body, and the valve is set In well body, easy to operation and repair.
In a preferred embodiment of the utility model, first measurement pipe can be located in well body, can also It positioned at well body upstream end, is preferably placed in well body, easy to operation and repair.Second measurement pipe can be located in well body, Well body downstream can be located at, be preferably placed in well body, easy to operation and repair.
In a preferred embodiment of the utility model, the valve is selected from gate valve, ball valve, butterfly valve, diamond valve, V Shape valve, rubber clack shut off at least one of check-valves.The type of drive of the valve can be used it is electronic, surge or pneumatically.
Device described in the present embodiment can be used for the reverse-filling on pipeline.Preferably, the reverse-filling on section dirty pipe. It is further preferred that for cutting the reverse-filling on dirty pipe in shunting well.
Device described in the present embodiment can be used for the flow control on pipeline.Preferably, the flow on section dirty pipe Control.It is further preferred that for cutting the flow control on dirty pipe in shunting well.
Embodiment 2
The present embodiment provides a kind of pipe-line system, the pipe-line system includes the dress being used in pipeline described in embodiment 1 It puts.
In a preferred embodiment of the utility model, the pipe-line system further includes pipeline, that is, sets described The pipeline of one measurement pipe, the second measurement pipe and valve.
Embodiment 3
The present embodiment provides a kind of double liquid level flow control methods on pipeline, the method is based on embodiment 1 The device being used on pipeline, described method includes following steps:
1) the liquid level H of upstream water body is monitored1With the liquid level H of downstream water2
2) liquid level difference (H of upstream water body and downstream water is determined1-H2) and the valve opening S and flow Q for flowing through pipeline Relational expression is as follows:
In formula,
S --- valve opening (discharge area in valve) (m2);
H1--- the liquid level (m) of the upstream water body of first liquid level gauge monitoring;
H2--- the liquid level (m) of the downstream water of second liquid level gauge monitoring;
σs--- flood coefficient;
G --- acceleration of gravity (m/s2);
M --- the discharge coefficient of free overflow, it is related with the boundary conditions such as pipeline;
σc--- side constriction coefficient reflects the cross-direction shrinkage due to pipeline, reduces effective overcurrent width and increased office Influence of portion's energy loss to discharge capacity;
Influence of the relative opening degree of μ --- the discharge coefficient of pipeline free discharge, reflection pipeline and valve to vent flow;
3) liquid level difference of upstream water body and downstream water based on monitoring and the relational expression, pass through controlling opening of valve To realize the control for the flow for flowing through pipeline.
In a preferred embodiment of the utility model, in the relational expression, σsTo flood coefficient, with liquid level difference (H1-H2) related, it can be obtained with table look-at.
In a preferred embodiment of the utility model, in the relational expression, K is set coefficient, works as liquid level difference (H1-H2) determine after, K is also definite value.
In a preferred embodiment of the utility model, in the relational expression, the parameter passes through definite phase of tabling look-up Relation number, and be modified when in use according to actual conditions;Alternatively, according to actual measured value, relational expression is directly utilizedMiddle proportionate relationship determines the set COEFFICIENT K of related coefficient, such as when front and rear liquid level difference determines When, σsCan table look-up acquisition;One timing of foundation of civil work structure snd size, equipment installation dimension and position, K is definite value;Therefore, By the liquid level difference (H for monitoring first liquid level gauge and second liquid level gauge1-H2) and valve opening S, you can it calculates and flows through pipeline Flow Q.
In a preferred embodiment of the utility model, the double liquid level flow control methods are used for the flow of pipeline Control.
In a preferred embodiment of the utility model, the double liquid level flow control methods are for a section stream for dirty pipe Amount control.
In a preferred embodiment of the utility model, the double liquid level flow control methods are used to cut in shunting well The flow control of dirty pipe.
Embodiment 4
The present embodiment also provides a kind of double liquid level flow control methods, and the double liquid level flow control methods further include as follows Step:
According to cutting the downstream line treatable maximum stream flow of institute that dirty pipe is connected or managing the downstream wastewater being connected with cutting a dirt The treatable maximum stream flow setting flow Q1 of institute for the treatment of plant;
A) during fine day, when flowing through the flow for cutting dirty pipe less than setting flow Q1, valve is shown in a fully open operation, and dry flow sewage is complete Portion, which flows into, to be cut in dirty pipe;
B) during the rainy day, judge that rainfall at this time is initial rainwater or middle and later periods rainwater;If initial rainwater, following steps are performed Rapid b-1);If middle and later periods rainwater, following step b-2 is performed);
B-1) during initial rainwater, when flowing through the flow for cutting dirty pipe less than setting flow Q1, valve is shown in a fully open operation;
When flowing through the flow for cutting dirty pipe higher than setting flow Q1, the aperture of control valve is realized to flow into and cuts dirt Guan Zhongshui The accurate control of body;
B-2) during middle and later periods rainwater, valve is in full off state, and water body is all flowed into natural water.
In the utility model, the initial rainwater refers to that, containing a large amount of pollutants, water quality is not reaching to discharge standard Water body, to the rainwater to rain in lasting 5-30min when generally beginning to rain;The middle and later periods rainwater refers to that water quality reaches row Put the water body of standard.
Embodiment 5
The present embodiment provides a kind of method of reverse-filling, the method be based on described in embodiment 1 on pipeline Device;The anti-down irrigation method includes the following steps:
1) the water body level value of valve inlet side and outlet side is monitored respectively by first liquid level gauge and second liquid level gauge, point H is not denoted as it1And H2
2) the water body level value H monitored by first liquid level gauge1With the water body level value H of second liquid level gauge monitoring2Size Judged:
Work as H1-H2More than zero or H2-H1During less than zero, valve is shown in a fully open operation, and the water body of valve inlet side flows to valve Outlet side;
Work as H1-H2Equal to zero or H2-H1During equal to zero, the aperture of control valve to H1-H2More than zero or H2-H1Equal to zero, keep away The water body for exempting from valve export side pours in down a chimney;And
Work as H1-H2Less than zero or H2-H1During more than zero, valve is in full off state, and the water body of valve export side is avoided to occur Pour in down a chimney.
Preferably, the method is the reverse-filling for cutting on dirty pipe.
Preferably, the method is the reverse-filling for cutting on dirty pipe in shunting well.
In the utility model, in drainage procedure, when the liquid level of downstream pipe is higher than the liquid level of upstream When, water body can pour in down a chimney phenomenon in the pipeline, i.e. downstream water pours in upstream end, causes upstream water body that cannot drain in time And waterlogging occurs;And the utility model is the control method using double liquid level, is installed respectively in the entrance side and outlet side of valve Liquid level gauge monitors the entrance side of valve and the height of water level of outlet side whether to judge to flow through the water body of the pipeline by liquid level gauge Phenomenon can be poured in down a chimney.When the height of water level of entrance side is higher than the height of water level of outlet side, water body relies on gravity, to going out Drain mouth side;When the height of water level of entrance side is less than the height of water level of outlet side, water body relies on gravity, is arranged to entrance side It walks, needs to close valve in time at this time, effectively prevent downstream water pours in down a chimney phenomenon.
More than, the embodiment of the utility model is illustrated.But the utility model is not limited to above-mentioned implementation Mode.Within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done, should be included in Within the scope of protection of the utility model.

Claims (14)

1. a kind of device on pipeline, which is characterized in that described device includes first liquid level gauge, second liquid level gauge and peace The first measurement pipe, valve and the second measurement pipe on pipeline;
First measurement pipe and the second measurement pipe are arranged on pipeline, and with the pipeline connection;
The valve is on the pipeline between first measurement pipe and the second measurement pipe;
First measurement pipe is located at the entrance side of the valve, and second measurement pipe is located at the outlet side of the valve;
The first liquid level gauge, for detecting the liquid level of the upstream water body in first measurement pipe;
The second liquid level gauge, for detecting the liquid level of the downstream water in second measurement pipe.
2. the apparatus according to claim 1, which is characterized in that first measurement pipe is arranged at parallel with the second measurement pipe On the pipeline.
3. device according to claim 1 or 2, which is characterized in that the first liquid level gauge is arranged in the first measurement pipe, The second liquid level gauge is arranged in the second measurement pipe.
4. device according to claim 1 or 2, which is characterized in that the first liquid level gauge and the second liquid level gauge Setting height(from bottom) is not less than 0.5 meter.
5. device according to claim 1 or 2, which is characterized in that first measurement pipe and second measurement pipe are equal It is set perpendicular to the pipeline.
6. device according to claim 1 or 2, which is characterized in that first measurement pipe and second measurement pipe with The distance between described valve is not more than 10 meters.
7. device according to claim 1 or 2, which is characterized in that described device further includes a well body, and the valve is set It is placed in well body.
8. device according to claim 7, which is characterized in that first measurement pipe is located in well body, alternatively, described One measurement pipe is located at well body upstream end.
9. device according to claim 7, which is characterized in that second measurement pipe is located in well body, alternatively, described Two measurement pipes are located at well body downstream.
10. device according to claim 1 or 2, which is characterized in that the valve is selected from gate valve, ball valve, butterfly valve, diamond shape Valve, V-arrangement valve, rubber clack shut off at least one of check-valves.
11. device according to claim 1 or 2, which is characterized in that the type of drive of the valve using it is electronic, surge It is or pneumatic.
12. device according to claim 1 or 2, which is characterized in that described device further includes controller, the controller It is connected respectively with the first liquid level gauge, the second liquid level gauge and valve signal, for receiving the first liquid level gauge and The liquid level signal of two liquid level gauges monitoring, and according to the aperture of the liquid level signal control valve.
13. a kind of pipe-line system, which is characterized in that the pipe-line system includes being used for any one of claim 1-12 Device in pipeline.
14. pipe-line system according to claim 13, which is characterized in that the pipe-line system further includes pipeline, that is, installs The pipeline of first measurement pipe, the second measurement pipe and valve.
CN201721290603.5U 2017-09-30 2017-09-30 A kind of device on pipeline Active CN207436196U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107894263A (en) * 2017-11-15 2018-04-10 中广核工程有限公司 The apparatus and method of the upstream and downstream liquid level difference of nuclear power station measurement filter screen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107894263A (en) * 2017-11-15 2018-04-10 中广核工程有限公司 The apparatus and method of the upstream and downstream liquid level difference of nuclear power station measurement filter screen

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