Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-pressure leakage flow rate measuring device and measuring method of shaft sealing pump for nuclear power plant

A flow measurement device and technology of leakage flow, applied in pump control, non-variable-capacity pump, machine/engine, etc., can solve the problems of inability to measure, damage, inaccurate measurement results, etc., to achieve simplified structure, improved reliability, Guaranteed response time effect

Active Publication Date: 2020-06-09
NUCLEAR POWER INSTITUTE OF CHINA
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-pressure leakage flow measurement device and measurement method for shaft seal pumps in nuclear power plants to solve the problem of damage to precision electronic components and processing modules after long-term measurement in an irradiation environment in the prior art The resulting measurement results are inaccurate or even impossible to measure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-pressure leakage flow rate measuring device and measuring method of shaft sealing pump for nuclear power plant
  • Low-pressure leakage flow rate measuring device and measuring method of shaft sealing pump for nuclear power plant
  • Low-pressure leakage flow rate measuring device and measuring method of shaft sealing pump for nuclear power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 In the shown low-pressure leakage flow measuring device of a shaft-sealed pump used in a nuclear power plant, a flow-measuring device 1 is installed on the low-pressure leakage pipeline of the shaft-sealed pump. The leakage gap 9 of the flow measurement device 1 is connected, and the leakage gap 9 is connected with the liquid inlet pipe 3; the measurement chamber 2 is provided with a throttle hole (8), and the throttle hole 8 communicates with the measurement chamber 2 and the flow measurement device 1 Inner space; also includes discharge pipe 4 and liquid level gauge 6, and described liquid discharge pipe 4 communicates flow measuring device 1 inside, and described liquid level gauge 6 is installed on the flow measuring device 1, and described liquid level gauge (6 ) is used to measure the height H of the fluid in the measuring chamber 2.

[0044] In some embodiments, the orifice 8 is located on the side wall of the measuring chamber 2 .

[0045] In ...

Embodiment 2

[0050] Adopt the measuring method of any measuring device in the above-mentioned embodiment, this method comprises the following steps:

[0051] Step 1: Install the measuring device on the low-pressure flow leakage pipeline;

[0052] Step 2: Measure the height H of the leakage fluid in the measurement chamber 2 by using the liquid level gauge 6;

[0053] Step 3: Calculate the flow Q of the leakage fluid according to the height H;

[0054] Wherein, the calculation formula of leakage flow Q described in step 3 is:

[0055]

[0056] Among them, r is the radius of the orifice, g is the acceleration of gravity, and H is the height of the leakage fluid in the measurement chamber.

[0057] This embodiment uses a pure hardware circuit to realize the measurement function, which not only ensures the response time and measurement accuracy, improves the reliability, but also can realize the measurement of the leakage flow without an additional processing unit, avoiding the radiation ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a low-pressure leakage flow rate measuring device and method of a shaft sealing pump for a nuclear power plant. A measuring cavity is formed inside the measuring device; the measuring cavity communicates with a leakage gap of the measuring device; the leakage gap is connected with a liquid inlet pipe; a throttle hole is formed in the measuring cavity, and communicates with the measuring cavity and the inside space of the measuring device; the measuring device also comprises a liquid discharging pipe and a liquid level meter; the liquid discharging pipe communicates withthe inside of the measuring device; and the liquid level meter is arranged on the measuring device, and is used for measuring the height H of fluid in the measuring cavity. The measuring method comprises the following steps of 1, installing the measuring device on a low-pressure flow rate leakage pipeline; 2, measuring the height H of leaked fluid in the measuring cavity by using the liquid levelmeter; and 3, calculating the flow rate Q of the leaked fluid according to the height H. The intermittent and discontinuous leaked fluid can be converted into stable and continuous fluid flowing through the throttle hole; a pure hardware circuit is used for realizing the measuring function; the response time and the measuring precision are ensured; and the reliability is improved.

Description

technical field [0001] The invention relates to the field of process measurement of a reactor coolant system in a nuclear power plant, in particular to a low-pressure leakage flow measuring device and a measuring method of a shaft seal pump used in a nuclear power plant. Background technique [0002] In nuclear power plants, shaft-sealed pumps are widely used as the main pump in the reactor coolant system, and the low-pressure leakage flow of the main pump is an important parameter to monitor whether the main pump is running normally. When the leakage flow exceeds the warning value, it means that the seal of the main pump has been worn or damaged, and a corresponding alarm will be triggered, which will eventually lead to the shutdown of the main pump. [0003] When the main pump is in normal operation, the low-pressure leakage flow is very small, about 3-10L / h. The flow value cannot be accurately measured by traditional flow measuring instruments, which cannot meet the measu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F04D15/00
CPCF04D15/0088F04D15/0077Y02E30/30
Inventor 徐涛朱加良何正熙青先国王华金李小芬苟拓李文平何鹏陈学坤陈静李红霞徐思捷王雪梅邓志光
Owner NUCLEAR POWER INSTITUTE OF CHINA