CN202305149U - Seal performance tester with temperature compensation function - Google Patents

Abstract

The utility model discloses a seal performance tester with a temperature compensation function, which comprises a seal tank, a first collecting end, a second collecting end and a processing unit; the seal tank is arranged in a tested body, and is made of a material with good heat conduction property; the first collecting end comprises a first temperature sensor, a first direct voltage sensor and a first pressure data source; the seal tank is connected with the first temperature sensor and the first direct voltage sensor, the first temperature sensor is connected with the processing unit, and the first direct voltage sensor is connected with the processing unit; the second collecting end comprises a second temperature sensor, a second direct voltage sensor and a second pressure data source; and the tested object is connected with the second temperature sensor and the second direct voltage sensor, the second temperature sensor is connected with the processing unit, and the second direct voltage sensor is connected with the processing unit. According to the utility model, the tested body is internally provided with the seal tank, the voltage of the tested body and the voltage of the seal tank are increased to be same, the temperature of the tested body and the temperature of the seal tank are same, and the problem of greater error caused by the greater environment temperature difference when the temperature of the tested object is read is avoided.

Description

A kind of sealing property tester with temperature compensation function

Technical field

The present invention relates to a kind of sealing property tester with temperature compensation function.

Background technology

At present, the sealing property testing apparatus majority of domestic use is from external introduction, and fetch long price and apparatus guarantee are safeguarded has sizable dependence.These equipment overwhelming majority adopts 51 series monolithics or AVR single-chip microcomputer as core processor in addition, receives the restriction of the hardware condition of processor own, and accuracy of detection can not be very high, systemic-function expansion difficulty.And also there is following deficiency in present sealing property testing apparatus: 1, sealing property testing tool equipment added value is not high, and technology content is on the low side, the core technology capability of independent innovation of industry and product a little less than.2, can not carry out multiplex's part synchronous detection, testing efficiency is not high.3, it is few to have a detecting instrument of temperature compensation function, receives the influence of environment temperature to cause testing result fluid, and the acceptance or rejection that is difficult to make testing result is judged.4, can't realize the management and the remote monitoring inquiry of powerful test result data and parameter configuration data.5, human-computer interaction interface and the not enough hommization of operation that provides.Therefore, exploitation a kind of can be simultaneously to a plurality of measured pieces detect, have temperature self-compensation strategy, data statistic analysis powerful, satisfy remote data management and mutual novel embedded sealing property detector is trend of the times.

Summary of the invention

The present invention is directed to the problem that efficient is low, cost is high that sealing detection instrument list workpiece sensing is brought; And the problems such as test out of true that caused by factor affecting such as environment temperature, a kind of sealing property tester and a kind of sealing property method of testing that a plurality of workpiece detect simultaneously that once can drive is provided, it has the accuracy of detection height; Good stability; Reliability and highly versatile, with low cost, the concrete scheme of the present invention is following:

A kind of sealing property tester with temperature compensation function comprises sealable tank, first collection terminal, second collection terminal and processing unit; Said sealable tank is positioned at measured body, and said sealable tank is processed by the good material of heat conductivility; Said first collection terminal comprises first temperature sensor, the first vertical compression sensor, the first pressure data source; Said sealable tank is connected with said first temperature sensor and the said first vertical compression sensor electrical, and said first temperature sensor is electrically connected with said processing unit, and the said first vertical compression sensor is electrically connected with said processing unit;

Said second collection terminal comprises second temperature sensor, the second vertical compression sensor, the second pressure data source; Said measured body is connected with said second temperature sensor and the said second vertical compression sensor electrical, and said second temperature sensor is electrically connected with said processing unit, and the said second vertical compression sensor is electrically connected with said processing unit.

Optional, said first collection terminal comprises first standard component of first temperature sensor, the first vertical compression sensor, first differential pressure pick-up and a constant pressure; The said first differential pressure sensing is electrically connected between said first standard component and the sealable tank;

Said second collection terminal comprises second standard component of second temperature sensor, the second vertical compression sensor, second differential pressure pick-up and a constant pressure; The said second differential pressure sensing is electrically connected between said second standard component and the measured body.

Optional, said processing unit comprises the ARM9 microprocessor.

Optional, said ARM9 microprocessor is provided with Ethernet interface.

Optional, said processing unit is electrically connected with the SC16C652B extended chip, and said SC16C652B extended chip comprises at least one RS485 mouth.

Optional, said first collection terminal comprises the AVR core processor, the said first vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter;

Said second collection terminal comprises the AVR core processor, and the said second vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter.

A kind of sealing property method of testing comprises the steps:

Set the numerical value in the first pressure data source, the numerical value in the second pressure data source in advance respectively;

In measured body, establish the good sealable tank of a heat conductivility;

The vertical compression pressure value P of record sealable tank ₀And thermodynamic temperature value T ₀, then measured body and sealable tank are inflated to same pressure and read force value Δ P ₁, the second pressure data source and sealable tank differential pressure value Δ P ₂, in the sealable tank gas in the vertical compression pressure P that detects the finish time ₁And thermodynamic temperature T ₁,, calculate the thermodynamic temperature variable quantity of sealable tank according to perfect gas equation

$\mathrm{\Δt}=\frac{-(T+273)\mathrm{\Δ}{P}_1}{P_0};$

The vertical compression pressure value P of the gas between record measured body and the seal ₂And the aerothermodynami temperature value T between measured body and the seal ₂, then measured body and sealable tank are inflated to same pressure P ₁, then read the vertical compression pressure value P of the gas between measured body and the seal ₃And the aerothermodynami temperature value T between measured body and the seal ₃, suppose that measured body seals fully, then according to perfect gas equation, calculate measured body and seal between the air pressure change amount ${\mathrm{\&Delta;\; <figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2^{\&prime;}=\frac{-{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2\mathrm{\&Delta;\; t}}{T+273};$

Suppose measured body and seal between gas do not having to leak last pressure P later under the situation of temperature effect _l, P then ₂-(P _l+ Δ P ₂')=Δ P ₂

Calculate measured body and seal between the true leakage rate of air pressure $P_2-P_l=\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2+\frac{{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2\mathrm{\&Delta;}{P}_1}{P_0}.$

Optional, the numerical value in the said first pressure data source is provided by first standard component of a constant voltage;

The numerical value in the said second pressure data source is provided by second standard component of a constant voltage.

Optional, measured body and sealable tank are inflated to same pressure P ₁Afterwards, read Δ P ₁, Δ P ₂, T ₁, P ₃, T ₃Before the data, also include the isobaric stage.

Optional, measured body and sealable tank are inflated to same pressure P ₁Afterwards, read Δ P ₁, Δ P ₂, T ₁, P ₃, T ₃Before the data, also include equilibrium stage.

Sealing property tester that the present invention program provides and sealing property method of testing; In measured body, establish the good sealable tank of a heat conductivility,, make measured body and sealable tank reach uniform temp through measured body and sealable tank being increased to the mode of same pressure; And through reading the temperature acquisition precise dose value of sealable tank; Because the error that circumstance of temperature difference causes greatly is bigger than normal, be to be " temperature compensation " when having avoided directly reading the measured body temperature, and the associated ideal gas equation; Sealing property to measured body detects and calculates, but is by the above scheme knowledge capital beneficial effect of the invention:

1, the present invention uses a processing unit, drives a plurality of detection collection terminals and carries out the sealing detection simultaneously, and this will promote testing efficiency greatly, shorten the test duration, thereby reduce production costs.

2, " temperature compensation " of the present invention strategy can more effective elimination environment temperature etc. the factor harmful effect of adding for the Leak Detection result, this is enhancing detection result's reliability, stability also has the versatility of instrument.

3, remote data monitoring query function of the present invention promptly provides Ethernet interface through ARM, and distance host can be put easily by means of the internet whole instrument controlled and information inquiry very much.

In addition, leak-testing of the present invention front and back end provides the modular design functional part, improves opening, maintainability and the quick customization capability of equipment, has satisfied the market demand in the present and following long duration on the whole, has improved product competitiveness.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute to improper qualification of the present invention, in the accompanying drawings:

Fig. 1 is a complete machine structure block scheme of the present invention;

Fig. 2 is the block diagram of processing unit among Fig. 1;

Fig. 3 is the block diagram of first collection terminal among Fig. 1;

Fig. 4 is that first collection terminal is connected synoptic diagram with second collection terminal with measured body.

Embodiment

To combine accompanying drawing and specific embodiment to specify the present invention below, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as to qualification of the present invention.

Embodiment

Like Fig. 1～shown in Figure 4, a kind of sealing property tester with temperature compensation function comprises sealable tank, first collection terminal, second collection terminal and processing unit; The block diagram of processing unit 1 is as shown in Figure 2 among Fig. 1, and the ARM9 core board is by ARM9 microprocessor, power circuit; The Flash 18 of 64M, the SDRAM 19 of 64M, GPIO outlet; Based on the LCD chip of row-field scanning, the LCD chip picks out the LCD display slot, the USB mouth; Real-time clock RTC 121, DM9000 network card chip 120, DM9000 network card chip 120 pick out Ethernet RJ45 socket; Serial port chip MAX3232SOP picks out two RS485 mouths, and serial ports expansion chip SC16C652B outwards expands two RS485 mouths and forms, and processing unit is outside to be connected with keyboard with display screen.

Processing unit 1 comprises the ARM9S3C2440 microprocessor 11 that is used for deal with data and each hardware module of control in the present embodiment, and those skilled in the art also can increase the display screen that is used to export human-computer interaction interface as required; The keyboard 13 that is used for the man-machine interaction input; Be used for the USB mouth 14 that significant data imports and exports; The RJ45 network interface 15 that is used for remote monitoring; Be used for the RS485 mouth 16 with 4 collection terminal communications, wherein two RS485 mouths 16 can be come out by 17 expansions of SC16C652B extended chip;

First collection terminal, 2 block diagram are as shown in Figure 3; Comprise the AVR core processor; The vertical compression force transducer 22 and the differential pressure pick-up 23 that join with A/D modular converter integrated on the ARM9 microprocessor sheet; IIC data static store chip 24, the solenoid valve 25 that joins with processor and link to each other with gas filling valve, equalizing valve, vent valve is with processor D/A conversion chip that join and that link to each other with electronic pressure regulating valve 26; The external control keyboard, power circuit is formed with processor serial port chip MAX3232SOP that join and that link to each other with the RS485 communication port.

As shown in Figure 4, said sealable tank 3 is positioned at measured body 4, and said sealable tank 3 is processed by the good material of heat conductivility; Said first collection terminal 2 comprises first temperature sensor, the first vertical compression sensor, the first pressure data source, and wherein the pressure source data can be pre-stored in first collection terminal 2; Said sealable tank 3 is connected with said first temperature sensor and the said first vertical compression sensor electrical, and said first temperature sensor is electrically connected with said processing unit 1, and the said first vertical compression sensor is electrically connected with said processing unit 1;

Shown in the second collection terminal organization plan identical with first collection terminal 2, said second collection terminal comprises second temperature sensor, the second vertical compression sensor, the second pressure data source, wherein the second pressure data source can be pre-stored in second collection terminal; Said measured body 4 is connected with said second temperature sensor and the said second vertical compression sensor electrical, and said second temperature sensor is electrically connected with said processing unit 1, and the said second vertical compression sensor is electrically connected with said processing unit 1.

As the part alternative of the foregoing description scheme, said first collection terminal 2 comprises first standard component 41 of first temperature sensor, the first vertical compression sensor, first differential pressure pick-up and a constant pressure; The said first differential pressure sensing is electrically connected between said first standard component and the sealable tank 3;

Said second collection terminal comprises second standard component 31 of second temperature sensor, the second vertical compression sensor, second differential pressure pick-up and a constant pressure; The said second differential pressure sensing is electrically connected between said second standard component and the measured body 4.

As the preferred version of the foregoing description scheme, said processing unit 1 comprises the ARM9 microprocessor.

As the preferred version of the foregoing description scheme, said ARM9 microprocessor is provided with Ethernet interface.

As the preferred version of the foregoing description scheme, said processing unit 1 is electrically connected with the SC16C652B extended chip, and said SC16C652B extended chip comprises at least one RS485 mouth.

As the preferred version of the foregoing description scheme, said first collection terminal 2 comprises the AVR core processor, and the said first vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter;

Said second collection terminal comprises the AVR core processor, and the said second vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter.

Also comprise a kind of sealing property method of testing, comprise the steps:

Set the numerical value in the first pressure data source, the numerical value in the second pressure data source in advance respectively;

In measured body 4, establish the good sealable tank of a heat conductivility 3;

The vertical compression pressure value P of record sealable tank 3 ₀And thermodynamic temperature value T ₀, then measured body 4 and sealable tank 3 are inflated to same pressure and read force value Δ P ₁, the second pressure data source and sealable tank 3 differential pressure value Δ P ₂, in the sealable tank 3 gases in the vertical compression pressure P that detects the finish time ₁And thermodynamic temperature T ₁, according to perfect gas equation PV=GRT=＞PV=CT (under constant molar weight gas situation, GR is a constant, regards constant C as).Measured body 4 is put in the constant temperature oven heating or is cooled to the temperature more high or low than environment temperature, can know

Calculate the thermodynamic temperature variable quantity of sealable tank 3 $\mathrm{\&Delta;\; t}=\frac{-(T+273)\mathrm{\&Delta;}{P}_1}{P_0};$

The vertical compression pressure value P of the gas between record measured body 4 and the seal ₂And the aerothermodynami temperature value T between measured body 4 and the seal ₂, then measured body 4 and sealable tank 3 are inflated to same pressure P ₁, then read the vertical compression pressure value P of the gas between measured body 4 and the seal ₃And the aerothermodynami temperature value T between measured body 4 and the seal ₃, suppose that measured body 4 seals fully, then can know according to perfect gas equation

Calculate measured body 4 and seal between the air pressure change amount ${\mathrm{\&Delta;\; <figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2^{\&prime;}=\frac{-{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2\mathrm{\&Delta;\; t}}{T+273};$

Suppose measured body 4 and seal between gas do not having to leak last pressure P later under the situation of temperature effect _l, P then ₂-(P _l+ Δ P ₂')=Δ P ₂... ... (5);

The true leakage rate of air pressure is between that can calculate measured body 4 by (2) (4) (5) formula and the seal:

$P_2-P_l=\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2+\frac{{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000101310170000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_2\mathrm{\&Delta;}{P}_1}{P_0}.$

As the improvement of the foregoing description scheme, the numerical value in the said first pressure data source is provided by first standard component of a constant voltage; The numerical value in the said second pressure data source is provided by second standard component of a constant voltage.

As the improvement of the foregoing description scheme, measured body 4 and sealable tank 3 are inflated to same pressure P ₁Afterwards, read Δ P ₁, Δ P ₂, T ₁, P ₃, T ₃Before the data; Also include the isobaric stage, the isobaric stage is used to calm down vibratility that has just charged into the detection loop gas and the local unevenness of eliminating gas, and purpose is to improve the degree of accuracy of detection; If measured piece out-of-shape or volume are excessive, then should consider to increase this stage.

As the improvement of the foregoing description scheme, measured body 4 and sealable tank 3 are inflated to same pressure P ₁Afterwards, read Δ P ₁, Δ P ₂, T ₁, P ₃, T ₃Before the data, also include equilibrium stage, equilibrium stage is used to stablize, the gas of tension metrics body and measured body 4 both sides, thereby improves the accuracy of test result.

More than the technical scheme that the embodiment of the invention provided has been carried out detailed introduction; Used concrete example among this paper the principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (6)

1. sealing property tester with temperature compensation function is characterized in that:

Comprise sealable tank, first collection terminal, second collection terminal and processing unit;

Said sealable tank is positioned at measured body, and said sealable tank is processed by the good material of heat conductivility;

Said first collection terminal comprises first temperature sensor, the first vertical compression sensor, the first pressure data source; Said sealable tank is connected with said first temperature sensor and the said first vertical compression sensor electrical, and said first temperature sensor is electrically connected with said processing unit, and the said first vertical compression sensor is electrically connected with said processing unit;

Said second collection terminal comprises second temperature sensor, the second vertical compression sensor, the second pressure data source; Said measured body is connected with said second temperature sensor and the said second vertical compression sensor electrical, and said second temperature sensor is electrically connected with said processing unit, and the said second vertical compression sensor is electrically connected with said processing unit.

2. the sealing property tester of band temperature compensation function as claimed in claim 1 is characterized in that:

Said first collection terminal comprises first standard component of first temperature sensor, the first vertical compression sensor, first differential pressure pick-up and a constant pressure; The said first differential pressure sensing is electrically connected between said first standard component and the sealable tank;

Said second collection terminal comprises second standard component of second temperature sensor, the second vertical compression sensor, second differential pressure pick-up and a constant pressure; The said second differential pressure sensing is electrically connected between said second standard component and the measured body.

3. the sealing property tester of band temperature compensation function as claimed in claim 1 is characterized in that:

Said processing unit comprises the ARM9 microprocessor.

4. the sealing property tester of band temperature compensation function as claimed in claim 3 is characterized in that:

Said ARM9 microprocessor is provided with Ethernet interface.

5. the sealing property tester of band temperature compensation function as claimed in claim 1 is characterized in that:

Said processing unit is electrically connected with the SC16C652B extended chip, and said SC16C652B extended chip comprises at least one RS485 mouth.

6. the sealing property tester of band temperature compensation function as claimed in claim 1 is characterized in that:

Said first collection terminal comprises the AVR core processor, and the said first vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter;

Said second collection terminal comprises the AVR core processor, and the said second vertical compression sensor is electrically connected with said AVR core processor through the A/D modular converter.

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