CN203083792U - Detector for leakage rate of part - Google Patents

Abstract

The utility model relates to a detector for leakage rate of a part. The detector for the leakage rate of the part comprises a detection case body, an atmospheric pressure gage and a display instrument. The detection case body comprises a case body, a wiring terminal cover plate, an inlet valve, a vent valve, a pressure gage, a temperature sensor and a to-be-detected part joint. The upper part of the case body is provided with the inlet valve; the lower part of the case body is provided with the vent valve; the pressure gage is used for measuring pressure of gas in the case body; the temperature sensor is arranged in the case body; the temperature sensor is used for measuring the temperature of the gas in the case body; the temperature sensor in the case body is connected together with the display instrument by wiring terminals on the wiring terminal cover plate; the display instrument is used for displaying a temperature value; the atmospheric pressure gage is used for displaying atmospheric pressure; the case body and all connecting pieces are hermetically connected; and a to-be-detected part and the to-be-detected part joint are hermetically connected together. The detector for the leakage rate of the part is convenient to install, disassemble and operate, is high in consistency, high in reliability and good in economic practicality, and moreover, can be used for obtaining the specific leakage rate of a detected part.

Description

A kind of pick-up unit of parts slip

Technical field

The utility model relates to a kind of pick-up unit, relates in particular to a kind of pick-up unit of parts slip.

Background technology

For the demanding parts of slip, existing leakage rate detection method is a lot, as supercritical ultrasonics technology, bubble method, halogen leak detection, radioisotope method etc.Wherein use supercritical ultrasonics technology, foam-forming method detection method simple to operate, but accuracy of detection is lower, and can not obtains concrete slip; Halogen leak detection, radioisotope method accuracy of detection height, but cost is higher, and higher to operating personnel's technical requirement simultaneously.

The utility model content

The purpose of this utility model provides a kind of pick-up unit of easy to operate, economical and practical good parts slip.

The technical solution of the utility model is: a kind of pick-up unit of parts slip, it comprises the detection casing, barometer, display instrument, described detection casing comprises casing, the binding post cover plate, gas admittance valve, vent valve, tensimeter, temperature sensor, parts interface to be detected, top at casing is provided with gas admittance valve, bottom at casing is provided with vent valve, tensimeter is used to measure the pressure of gas in the casing, temperature sensor places in the casing, temperature sensor is used to measure the gas temperature in the casing, temperature sensor in the casing links together by binding post on the binding post cover plate and display instrument, display instrument displays temperature value, barometer shows atmospheric pressure, for being tightly connected, band detects parts and parts sealing joint to be detected links together between casing and each web member.

Described casing internal pressure value and atmospheric pressure value also show by display instrument.

For more accurate measurement slip, be provided with two or more temperature sensors in the described casing.

Measure for the slip that adapts to different parts, on described casing, be provided with two or more parts interfaces to be detected.

Be provided with three temperature sensors in the described casing, place the upper, middle and lower in the casing respectively.

The utility model installation, dismounting, easy to operate, high conformity, the reliability height, economic and practical is good, can draw the concrete slip of tested parts.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A cut-open view of Fig. 1.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As depicted in figs. 1 and 2, this parts slip quantizes pick-up unit and comprises the detection casing, barometer 5, display instrument 4, detect casing and comprise casing 1, binding post cover plate 8, gas admittance valve 2, vent valve 7, tensimeter 3, temperature sensor I9-1, temperature sensor II9-2, temperature sensor III9-3, parts interface I6-1 to be detected, parts interface II6-2 to be detected, wherein gas admittance valve 2, tensimeter 3, display instrument 4, barometer 5 and parts interface I6-1 to be detected are located at the top of casing 1 successively, vent valve 7 is located at casing 1 bottom, parts interface II6-2 to be detected and binding post cover plate 8 are located at casing 1 one sides, temperature sensor I9-1, temperature sensor II9-2 and temperature sensor III9-3 place in the casing 1, and be connected with display instrument 4 by the binding post on the binding post cover plate 8,3 temperature sensors be provided for gas temperature in the more accurate measurement casing 1, tensimeter 3 is used to measure the pressure of gas in the casing 1, barometer 5 shows atmospheric pressure, casing 1 is tightly connected with each web member, and band detection parts and parts interface I6-1 to be detected are tightly connected with parts interface II6-2 to be detected and are in the same place.

The detection step of concrete parts slip is:

At first will clean out in the leak test device, removing volatile liquid etc. are to the influential material of pressure;

Feeding purity by gas admittance valve 2 toward casing 1 then is 99.99% drying nitrogen and rises to certain pressure P _N, close gas admittance valve 2, leave standstill a period of time, treat pressure stability and record data, related data all can be shown by display instrument 4, atmospheric pressure P before and after the detection of record barometer 5 feedbacks _Air0, P _Air1, temperature sensor I9-1, temperature sensor II9-2, temperature-averaging value θ before and after detecting in the casing 1 of temperature sensor III9-3 feedback ₀, θ ₁, pressure value P before and after the detection in the casing 1 of tensimeter 3 feedbacks ₀, p ₁,

At last, the nitrogen that measurement is finished is discharged casing 1 by vent valve 7.

The calculation procedure of concrete parts slip is:

By above measurement data,, and leak rate data is handled with least square method according to following formula.

$L_{\mathrm{FlaN}}=\frac{L}{\frac{P_0}{P_N}\×\sqrt{\frac{M_{\mathrm{rLla}}}{M_{\mathrm{ra}}}}}=V(\frac{P_{\mathrm{air}0}+p_0}{273.15+{\mathrm{\θ}}_0}-\frac{P_{\mathrm{air}1}+p_1}{273.15+{\mathrm{\θ}}_1})\×\frac{{\mathrm{\θ}}_a}{p_a}\×\frac{24}{\mathrm{\Δt}}\×(\frac{p_N}{p_0}\×\sqrt{\frac{M_{r}a}{M_{\mathrm{rLla}}}})$

Wherein: L _FlaN: slip

V: casing charging volume (m ³);

P _N: the pressure (Mpa) when detecting in the casing

P _Air0, P _Air1: detect forward and backward atmospheric pressure (Mpa)

P ₀, p ₁: the endoceliac pressure of case (Mpa) before and after detecting

θ ₀, θ ₁: detect the endoceliac medial temperature of forward and backward case (℃)

p _a, θ _a: standard atmospheric pressure (Mpa) and the corresponding absolute temperature (K) of 20 degree Celsius

Δ t: test period (h)

M _Ra, M _Rfla: the molal weight of nitrogen and sealing medium to be measured (g/mol)

The slip L of leak test device own ₀Calibration: parts slip L to be measured, the slip L of leak test device own ₀, L ₀＜0.1L.Concrete steps are: cleaning plant inside, before being connected into parts to be measured, seal parts interface I6-1 to be measured by technology cover plate I, technology cover plate II seals parts interface II6-2 to be measured, guarantee whole device sealing, detect and calculate the slip L of leak test device itself ₀Insert parts at parts interface I6-1 to be measured or parts interface II6-2 to be measured then, detect and calculate the leakage rate L of parts, as L ₀Surpass 0.1L and then find out leakage point and adopt corresponding measure to detect again, until L ₀＜0.1L.After the slip calibration of leak test device own, dismantle processes cover plate I or technology cover plate II(need detection case to remove according to reality), all the other each parts remain unchanged.

Again parts to be measured are inserted parts interface I6-1 to be detected or parts interface II6-2 to be detected, do not connect the parts interface and seal, detect and calculate slip L, also have slip L because of installing itself ₀, so the final leakage rate L of parts _{Actual leakage rate}=L-L ₀

Claims (8)

1. the pick-up unit of a parts slip, it comprises the detection casing, barometer, display instrument, it is characterized in that, described detection casing comprises casing, the binding post cover plate, gas admittance valve, vent valve, tensimeter, temperature sensor, parts interface to be detected, top at casing is provided with gas admittance valve, bottom at casing is provided with vent valve, tensimeter is used to measure the pressure of gas in the casing, temperature sensor places in the casing, temperature sensor is used to measure the gas temperature in the casing, temperature sensor in the casing links together by binding post on the binding post cover plate and display instrument, display instrument displays temperature value, barometer shows atmospheric pressure, and for being tightly connected, parts to be detected and parts sealing joint to be detected link together between casing and each web member.

2. the pick-up unit of a kind of parts slip according to claim 1 is characterized in that, described casing internal pressure value and atmospheric pressure value also show by display instrument.

3. according to the pick-up unit of claim 1 or the described a kind of parts slip of claim 2, it is characterized in that, be provided with two or more temperature sensors in the described casing.

4. according to the pick-up unit of claim 1 or the described a kind of parts slip of claim 2, it is characterized in that described casing is provided with two or more parts interfaces to be detected.

5. the pick-up unit of a kind of parts slip according to claim 3 is characterized in that, described casing is provided with two or more parts interfaces to be detected.

6. according to the pick-up unit of claim 1 or claim 2 or the described a kind of parts slip of claim 5, it is characterized in that, be provided with three temperature sensors in the described casing, place the upper, middle and lower in the casing respectively.

7. the pick-up unit of a kind of parts slip according to claim 3 is characterized in that, is provided with three temperature sensors in the described casing, places the upper, middle and lower in the casing respectively.

8. the pick-up unit of a kind of parts slip according to claim 4 is characterized in that, is provided with three temperature sensors in the described casing, places the upper, middle and lower in the casing respectively.

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