CN2872061Y

CN2872061Y - Liquid-phase leakage detector

Info

Publication number: CN2872061Y
Application number: CN 200520133102
Authority: CN
Inventors: 蒋坚毅; 郭红晓; 徐森; 李安明; 周建为; 周文权
Original assignee: BEIJING YEHE TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: BEIJING YEHE TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2005-11-17
Filing date: 2005-11-17
Publication date: 2007-02-21
Anticipated expiration: 2015-11-17

Abstract

The utility model relates to a liquid chromatography leakage detector, which comprises 2-3 rotator flow meters, a pressure gauge, a thermometer, a three-way valve to control liquid channel, a globe valve and multiple pipe; the flow meter is arranged between two jointers with mutually coupled and converted/ the leak checker is fixed with a simple device to determine a container with liquid, piping and valve, especially the leak amount for isolating valves of nuclear valve. The device has a large measurement range, thus guaranteeing accurate measurement to any leakage even a momentary value to judge steadiness of the system. The utility model is able to prevent a floater of a rotator flow meter from being attached with bubbles and impurities during measurement to guarantee the accuracy of measurement result.

Description

The liquid phase leak detector

Technical field

The utility model relates to the leakage that detects the container, pipe-line system and the valve that are filled with liquid, particularly detects the instrument and equipment of nuclear power plant's separating valve sealability.

Background technique

Nuclear power plant prevents to be water filling system more than 60% in the isolated system that nuclear leakage designs.Water filling system is all respectively established a separating valve usually and is carried out two the isolation inside and outside containment.Must carry out sealability one by one to these separating valves measures.

In known technology, nuclear safety shell local leakage rate test method has water collecting method, flow replenishment, pressure damped method, vacuum maintenance method etc.In the document of relevant liquid phase leak detection, Japan Patent JP2002106800-A discloses a kind of detection system that is used for high-temperature pipe escape of liquid in the nuclear safety shell, its principle is the insulation layer surface that the wire of leak sensor is wrapped in high-temperature pipe, when high-temp liquid leaks to insulation layer surface and contacts with sensor, can produce preset signal.It can be to leakage alarm but can not measure leakage rate." the containment system leakage test requires ANSI/ANS-56-8-2002 " (u.s. norm) and " seal tightness test of containment and strength test RCC-G88 " (French standard), disclose the flow replenishment and the water collecting method that use a flowmeter respectively and carried out the separating valve leakage test, and the formula that the leakage rate of the water measured is converted into gas volume.

The water collecting method is fairly simple, but because of the isolated system more complicated, is difficult to sometimes find the water receiving position, even find water inlet, does not then also receive water when leakage rate is very little for a long time.Leakage rate changes, and is only real leakage rate when only being stabilized in a certain value.And the cumulant of a period of time can only be collected and measure to this method, can not measure the instantaneous flow value, therefore is difficult to judge the steady state of leakage.

So-called flow replenishment is exactly to replenish the fluid identical with measured medium with certain pressure to equipment under test or system, and adjusts its flow, and when the pressure stability in the system under test (SUT), this flow value promptly is a leakage rate.Flowmeter is aided with one can provide the dress of the fluid identical with measured medium with certain pressure and pressure stability can implement the leak detection of flow replenishment.But because the leakage rate difference of distinct device is very big, if only use a flowmeter then range is limited, general maximum range is 10: 1 with the ratio of minimum range, often will change the flowmeter of several different ranges when therefore detecting, and wastes time and energy, very trouble.Simultaneously during the spinner survey tiny flow quantity, often adhere to bubble or impurity on its float, influence the accuracy of measurement result, particularly like this when particularly measuring the flow less than 100ml/h.

Summary of the invention

The utility model aims to provide a kind of liquid phase leak detector, it is aided with a device that the fluid identical with measured medium with certain pressure and pressure stability can be provided in use, can measure the container that is filled with liquid, pipe-line system and valve, the particularly leakage rate of nuclear power plant's separating valve.Its range of measurement is big, can both measure fast and accurately to minute leakage with than gross leak; The momentary value that the energy measurement leakage rate changes is convenient to judge the steady state of system; Adhere to bubble or impurity in the time of preventing to measure tiny flow quantity on the rotameter, can get rid of easily even adhere to once in a while also, thus the accuracy of guarantee measurement result.

For achieving the above object, the technological scheme of liquid phase leak detector is: by the assembling of casing with lower member: 2～5 rotameters, pressure gauge, thermometer: the three-way valve on control liquid road, stop valve, with the flowmeter number adapt how logical; The flexible pipe and the FERRULETYPE that are communicated with the liquid road connect mouth; The power supply of pressure gauge and thermometer.The range of said flowmeter is connected mutual switching mutually, and flowmeter is installed in parallel side by side on same vertical surface, and its import is connected with the many logical imports of the outlet of leading to and another respectively with outlet more; How logical being obliquely installed that is connected with the flowmeter import, small flowmeter one end is lower, and large capacity meter one end is higher; The how logical import that is connected with the flowmeter import connects mouth with the import on the casing and is connected, the how logical outlet that is connected with the flowmeter outlet is connected with the mensuration mouth of a three-way valve, second mouthful of import with a four-way of this three-way valve is connected, and the 3rd mouthful of how logical import that is connected with the import with flowmeter communicates.The outlet that an outlet of said four-way valve on stop valve and casing can be connected system under test (SUT) connects mouth and connects, and another outlet connects mouth by Decompression valves and pressure relief opening on the casing and is connected.For measuring the pressure and temperature of measured medium, the sensor of pressure gauge and thermometer is received the flowmeter outlet port.Because measured medium is a liquid, pressure gauge and thermometer all adopt the LCD instrument of dry cell power supply to ensure safety.The installation of flowmeter, pressure gauge, thermometer and relevant switch valve should make can read data and operation easily outside casing.

The flowmeter that range is connected mutually is many more, and measuring range is big more, but then increases the instrument volume and weight too much, and the mensuration of big flow does not belong to the leak detection category.Therefore between 2～5, select usually according to the leakage scope of system under test (SUT) expection, get final product with 4 as the leakage of measuring nuclear power plant's separating valve.

Quick for easy switching, generally use the rotameter of being with needle-valve, the most handy DK-800 rotameter, its error is that part fiducial error and part relative error sum define, and the degree of accuracy of lower range part is further improved.

Rotameter records is volume flowrate but not mass flow rate, and the pressure and temperature of the fluid of flowmeter makes measurement result more meaningful but pressure gauge, thermometer actual response are flowed through.

Measured medium can be other liquid such as water, oils.

On the cabinet panel charging jack can be installed, when power voltage insufficient, charge.

Advantage of the present utility model and good effect are tangible.The first, background technique does not have the special instrument of liquid phase leak detection; The second, from structure characteristics,, enlarged measuring range undoubtedly owing to adopt a plurality of rotameters and range to be connected mutually, 4 ranges that are connected mutually are from 0.002L/h～25L/h, and range ratio reaches 1: 12500; Switch mutually between the flowmeter, need not to change flowmeter midway, thus fast convenient; What be obliquely installed how has logically constituted multistage moisture trap.The separated wide range flowmeter lower end that is trapped in of bubble in the fluid, flowing to the timing of a small amount of range of flow has not had, thereby can not influence the measurement accuracy of tiny flow quantity, and bubble can not disturb the mensuration to big flow; When leakage rate changed, flowmeter promptly showed the instantaneous flow value under certain pressure and the temperature, when indicating value is constant, showed to leak to have reached steady state that the flowmeter indicating value promptly is real leakage rate.

Embodiment

Concrete structure of the present utility model and using method will further be provided by following drawings and Examples.

Description of drawings

Fig. 1 is the organigram of liquid phase leak detector

Fig. 2 is to use the liquid phase leak detector to measure the schematic representation of nuclear power plant's separating valve leakage (separating valve and test mouth thereof do not draw among the figure)

Left side dotted portion is a leak detector among Fig. 2, and the right is an auxiliary device that belongs to prior art, and it is a liquid storage tank that water source, source of the gas and pressure regulator valve are arranged, and can provide the water with certain pressure and pressure stability to leak detector.

Reference character: Q1, Q2, Q3, Q4-DK-800 rotameter; P1, P2-pressure gauge; The T-thermometer; The 1-import connects mouth; 2,5,6,8-connects flexible pipe; 3,4-five-way; The 7-four-way; 9-is connected with system under test (SUT) connects mouth; The 10-pressure relief opening; The 11-bypass tube; The 12-liquid storage tank; The 13-source of the gas; The 14-water source; The K1-three-way valve; The K2-stop valve; The K3-Decompression valves; K4, K5, K6, K7, K8-valve; The K9-pressure regulator valve;

Embodiment 1: liquid-phase leakage detector (seeing Fig. 1) with a casing assembling, has 4 DK-800 rotors Flowmeter Q1, Q2, Q3, Q4, range (L/h) is respectively 0.002～0.025,0.025～0.25, and 0.25～2.5, 2.5～25, be installed in parallel side by side on same vertical plane, its import and outlet respectively with the outlet of five-way 3 and The import of five-way 4 connects; Five-way 3 is obliquely installed, and Q1 one end is lower, and Q4 one end is higher; Five-way 3 Import connects mouth 1 with flexible pipe 2 and import on the casing and is connected, and the outlet of five-way 4 is by tube connector 5 and threeway The mensuration mouth of valve K1 connects, and second mouthful of import with four-way 7 of this triple valve is connected, the 3rd mouthful and five-way 3 Import communicate. An outlet of cross valve 7 connects mouth 9 on stop valve K2 and tube connector 8 and casing Connect, another outlet is by the pressure relief opening 10 of relief valve K3 to the casing; Pressure gauge P1 and thermometer T Sensor receive the outlet that four-way 7 is flowmeter. Pressure gauge P1 and thermometer T adopt liquid crystal digital aobvious Show device. Pressure gauge P1 is connected into 12v supply pressure sensor and electricity consumption with the Ni-MH battery of 10 joint 1.2v The resistance dividing potential drop 5v give display, and thermometer T saves 1.2v battery series-feds with 2. Casing is with two 0.8mm ∏ type sheet metal snapping form, appearance and size (mm) is 280 * 200 * 400, heavy 7kg. 4 flows Take into account the display screen of Pressure gauge, thermometer and console switch all in front on the plate, have import to connect mouth on the rear board 1, outlet connects mouth 9 and pressure relief opening connects mouth 10, sensor and the company of all the other parts and Pressure gauge, thermometer Take over line all in casing. Connecting

hose

2,5,6,8 is all used Φ 6 nylon tubes.

Embodiment 2: be aided with existing apparatus with liquid-phase leakage detector shown in Figure 1 and detect the nuclear power plant isolating valve Leak (seeing Fig. 2).

Auxiliary device is one has the water storage of water source 14 and source of the gas 13 and pressure regulator valve K9 to irritate 12, by valve K5, K6 water filling in jar.During test, with the bypass tube 11 of φ 10 water source is connect mouth 1 with instrument inlet port respectively and be connected with system under test (SUT), the instrument outlet connects the test mouth that mouth 9 also is connected to separating valve, opens the power switch of pressure gauge P1, thermometer T.

Look into bleed pressure: open valve K8, K6, K1 (sensing way system), pressure regulator valve K9 reaches maximum, all the other valve closings, and the indicating value of pressure gauge P1, P2 promptly is a bleed pressure.

Look into source pressure: open valve K5, K1 (sensing way system), all the other valves cut out.Pressure gauge P1 indicating value is source pressure.

Look into system under test (SUT) pressure: open valve K2, all the other valves close, and pressure gauge P1 indicating value is system under test (SUT) pressure.When if this pressure is lower than the required pressure of test, then open valve K5, K4, K2 to system under test (SUT) water-filling (all the other valves close).When the system for the treatment of is full of water and reaches test pressure, stop water-filling, close valve K5, K4.If the system under test (SUT) volume is less, also can pass through the instrument water-filling, promptly by connecing mouth 1, connecting tube 2, three-way valve K1 (sensing way system), four-way 7, valve K2, connecting tube 8 and connecing mouth 9 to system under test (SUT).The former is thicker because of bypass tube 11, and the throttle resistance of liquid road is little, and water-filling is faster than the latter.

The separating valve leakage measuring: open valve K1 (point to and measure), K6, K8, all the other valves close.By pressure regulator valve K9 bleed pressure is transferred to a little more than test pressure, open the needle-valve of flowmeter Q4, if outrange is then pointed to way system with valve K1, be filled to test pressure to system again, afterwards valve K1 is pointed to and measure, if flowmeter Q4 is outrange still, the leakage rate that this separating valve is described is greater than more than the 25L/h; Reach steady state if float is stabilized in the indicating value of a certain value and pressure gauge P1 when also constant, the indicating value of flowmeter Q4 is the leakage rate of this separating valve.If float be cannot get up, illustrate that leakage rate is little, need switch to little shelves flowmeter survey one by one, when float was stabilized in a certain flowmeter, its indicating value promptly was the leakage rate of being surveyed.If when the float of flowmeter Q1 does not rise yet, illustrate that leakage rate is less than below the 2ml/h.When having bubble or impurity once in a while on the float of flowmeter, its needle-valve and valve K2 are closed in the measurement, open valve K3, slowly open the needle-valve of just having closed again, can be with bubble or Impurity removal.

Detection finishes, and will can carry separately after leak detector and water source and the system under test (SUT) disconnection.

Claims

1. the liquid phase leak detector is characterized in that being assembled with lower member by a casing: 2～5 rotameters, pressure gauge, thermometer; The three-way valve on control liquid road, stop valve, with the flowmeter number be complementary how logical; The flexible pipe on connection liquid road and FERRULETYPE connect chews; The power supply of pressure gauge and thermometer; The range of said flowmeter is connected mutual switching mutually, and flowmeter is installed on the same vertical surface side by side, and its import is connected with the many logical imports of the outlet of leading to and another respectively with outlet more; How logical being obliquely installed that is connected with the flowmeter import, range of flow meter one end is on the low side in a small amount, and wide range flowmeter one end is higher; The how logical import that is connected with the flowmeter import connects to chew with the import on the casing and is connected, the how logical outlet that is connected with the flowmeter outlet is connected with the mensuration mouth of a three-way valve, second mouthful of import with a four-way of this three-way valve is connected, and the 3rd mouthful of how logical import that is connected with the import with flowmeter communicates; An outlet of said four-way outlet that can be connected system under test (SUT) on stop valve and casing connects chews connection, and another outlet is by the pressure relief opening of Decompression valves to the casing; The sensor of pressure gauge and thermometer is received the outlet port of flowmeter; Pressure gauge and thermometer all adopt the LCD instrument of dry cell power supply; The installation of flowmeter, pressure gauge, thermometer and relevant switch valve should make and can read data and operation easily from the casing outside.

2. according to the said leak detector of claim 1, it is characterized in that having 4 DK-800 rotameter Q1, Q2, Q3, Q4, its range is respectively 0.002～0.025, and 0.025～0.25,0.25～2.5,2.5～25, range unit is L/h; What is connected is respectively five-way (3) and five-way (4) with flowmeter import and outlet, all connection flexible pipes usefulness φ 6 nylon tubes.