CN102435403B - Integrated device applicable to differential pressure leakage detection of high/low pressures - Google Patents

Integrated device applicable to differential pressure leakage detection of high/low pressures Download PDF

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Publication number
CN102435403B
CN102435403B CN201110280997.7A CN201110280997A CN102435403B CN 102435403 B CN102435403 B CN 102435403B CN 201110280997 A CN201110280997 A CN 201110280997A CN 102435403 B CN102435403 B CN 102435403B
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subaisle
valve
channel
pneumatic
passage
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CN102435403A (en
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张美琴
陈俊华
林躜
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Ningbo Institute of Technology of ZJU
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Ningbo Institute of Technology of ZJU
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Abstract

The invention discloses an integrated device applicable to the differential pressure leakage detection of high/low pressures. The device comprises a valve plate, wherein a first channel communicated with a tested workpiece, a second channel communicated with a standard container and a detection air source inlet channel communicated with a detection air source are arranged in the valve plate. The integrated device also comprises a pneumatic charge valve, a pneumatic discharge valve, a differential pressure sensor and a pressure sensor, wherein the pneumatic charge valve is used for controlling the communication or cutoff between the detection air source inlet channel and the first channel and the second channel; the pneumatic discharge valve is used for controlling the communication or cutoff between the first channel and the second channel and the atmosphere; the differential pressure sensor is used for sensing the differential pressure between the first channel and the second channel; the pressure sensor is used for sensing the pressure of the first channel or the second channel; and the pneumatic charge valve, the pneumatic discharge valve, the differential pressure sensor and the pressure sensor are all mounted on the valve plate. The integrated device has relatively low cost; and a pneumatic system can be integrated on the valve plate, thus the mounting and use are convenient, and the air path is simplified.

Description

Be applicable to the integrating device of high-low pressure differential pressure Leak Detection
Technical field
The present invention relates to a kind of integrating device that is applicable to high-low pressure differential pressure Leak Detection, belong to leak detection technology field.
Background technology
In machinery manufacturing industry, often need to carry out impermeability detection to some parts, concerning some product, impermeability is an important index, the bad meeting of impermeability causes leakage, leak and directly affect mechanical reliability, economy and overall performance, cause occurring in actual use the problems such as malfunctioning machine, operation exception, Efficiency Decreasing, the lost of life, oil plant waste and environmental pollution.Therefore Leak Detection is very important in producing, and the height of leak detection technology level can directly affect the quality of production efficiency, operating personnel's labour intensity and product.
At present, differential pressure Leak Detection method is the detection method that leak detection technology is comparatively conventional, by the gas of passing into certain pressure to tested workpiece and volumetric standard, balance pressurize a period of time, thus the differential pressure between detection measured workpiece and volumetric standard obtains the leakage rate of measured workpiece.The whole testing process of the method has comprised inflation, balance pressurize, detection, venting four-stage, and therefore generally, the pneumatic system that forms differential pressure leak detection system has comprised gas filling valve, equalizing valve and three basic detection valves of air release.And because differential pressure leak detection system itself is used the singularity of function, sealing requirements for the pneumatic system that forms differential pressure leak detection system detection valve used is high, and any small leakage part of detection valve used can cause very large impact to testing result.In the market, most of Differential Pressure Leak Detector devices all directly adopt the external all kinds of solenoid valves of producing and pneumatic valve as direct accessory, and this way is convenient and simple, but exists a lot of deficiencies simultaneously:
1. the pneumatic ball valve price of selecting above-mentioned company to produce is very expensive, and this high cost will have a strong impact on the market competitiveness of Differential Pressure Leak Detector producer.
2. in use, need a lot of high-low pressure tracheaes that these pneumatic ball valves are coupled together, gas circuit more complicated, and the design of pneumatic circuit takies larger space.
3. while detecting, all need each parts to assemble at every turn, operate very loaded down with trivial details.
Summary of the invention
In view of above-mentioned factor, the object of this invention is to provide a kind of integrating device that is applicable to high-low pressure differential pressure Leak Detection, this integrating device passes through in conjunction with homemade pneumatic valve and valve plate, can realize the whole pneumatic system of differential pressure Leak Detection is integrated on a fixing valve plate, greatly reduce cost, and simplified the pneumatic circuit design of differential pressure Leak Detection, easy to operate and stable performance.
For solving the problems of the technologies described above, the present invention adopts a kind of like this integrating device that is applicable to high-low pressure differential pressure Leak Detection, it comprises valve plate, is provided with first passage for being communicated with measured workpiece, for the second channel that is communicated with volumetric standard, for the detection air-source inflow passage with detecting source of the gas and being communicated with in described valve plate;
The integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention also comprise for controlling detect air-source inflow passage and first passage and second channel circulation or the pneumatic gas filling valve ending, for controlling the pneumatic air release of first passage and second channel and flow of ambient air or cut-off, for responding to the differential pressure pick-up of differential pressure between first passage and second channel, for responding to the pressure transducer of first passage or second channel pressure, described pneumatic gas filling valve, pneumatic air release, differential pressure pick-up, pressure transducer are installed on valve plate.
The endpiece of described first passage is provided with is convenient to the measured workpiece interface that is connected with measured workpiece; The endpiece of described second channel is provided with is convenient to the volumetric standard interface that is connected with volumetric standard; The inlet end of described detection air-source inflow passage is provided with to be convenient to and the detection gas source interface that detects source of the gas and be connected.
Described pneumatic gas filling valve comprises the valve body with axial stepped cavity, form with axial step cavity the ladder spool being sealed and matched, be arranged on the upper end cover at valve body top, be located at the holddown spring between upper end cover and ladder spool, be arranged on valve body bottom and be provided with the bottom end cover that forms the plunger rod being sealed and matched with the cavity of resorption of axial step cavity, the sidewall of described valve body is provided with the control air-source inflow passage being communicated with the epicoele of axial step cavity, described bottom end cover is provided with three gas channels that are communicated with the cavity of resorption of axial step cavity, the lower end of described ladder spool is provided with plunger rod sealing and offsets and then control the resilient seal sprue that three gas channels are communicated with or end with the cavity of resorption of axial step cavity.
The integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention also comprises the equalizing valve that mutually circulates or end for controlling first passage and second channel, and described equalizing valve is arranged on valve plate, and described equalizing valve is identical with the structure of pneumatic gas filling valve.
Described first passage is by the first main channel for being communicated with measured workpiece and be convenient to the first subaisle I, the first subaisle II, the first subaisle III, the first subaisle IV that pneumatic gas filling valve, pneumatic air release, differential pressure pick-up, pressure transducer be communicated with the first main channel respectively and form;
Described second channel is by the second main channel for being communicated with volumetric standard and be convenient to the second subaisle I, the second subaisle II, the second subaisle III, the second subaisle IV, the second subaisle V that pneumatic gas filling valve, pneumatic air release, differential pressure pick-up, pressure transducer be communicated with the second main channel respectively and form;
Described detection air-source inflow passage forms with the detection air-source inflow subaisle that detection air-source inflow main channel is communicated with by detecting air-source inflow main channel and being convenient to pneumatic gas filling valve.
In described valve plate, be also provided with the vertical bleed passage that extends and run through valve plate along valve plate short transverse, the exit of described vertical bleed passage is provided with sound suppressor.
On described first passage, be also provided with and be convenient to the first subaisle VI that equalizing valve is communicated with the first main channel, on described second channel, be also provided with and be convenient to the second subaisle VI that equalizing valve is communicated with the second main channel.
The port of three gas channels of described pneumatic gas filling valve is connected with the port of the first subaisle I, the second subaisle I, detection air-source inflow subaisle respectively.
Described pneumatic air release is identical with the structure of pneumatic gas filling valve, and the port of three gas channels of described pneumatic air release is connected with the port of the first subaisle II, the second subaisle II, vertical bleed passage respectively.
The port of a gas channel of described equalizing valve is provided with resilient seal and stops up, and the port of the two other gas channel of described equalizing valve is connected with the first subaisle VI, the second subaisle VI respectively.
Adopt after above structure, the present invention compared with prior art, have the following advantages: the integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention is easy to make, production cost is low, greatly improved the market competitiveness of Differential Pressure Leak Detector producer, and pneumatic gas filling valve and pneumatic air release are all suitable for the in the situation that of high-low pressure, therefore the scope of application is quite extensive.Moreover the integrating device volume that is applicable to high-low pressure differential pressure Leak Detection of the present invention is little, pipeline connects simple, can greatly simplify the pneumatic circuit design of differential pressure Leak Detection, is applicable to modularization Integrated Development, without in use each parts being assembled, operate simple, convenient.
As improvement, because being provided with, the endpiece of described first passage is convenient to the measured workpiece interface that is connected with measured workpiece, when utilizing pipeline communication valve plate and measured workpiece, become so very simple, convenient; Because the endpiece of described second channel is provided with, be convenient to the volumetric standard interface that is connected with volumetric standard, when utilizing pipeline communication valve plate and volumetric standard, become so very simple, convenient; The inlet end of described detection air-source inflow passage is provided with to be convenient to and the detection gas source interface that detects source of the gas and is connected, becomes so very simple, conveniently when utilizing pipeline communication valve plate and detecting source of the gas.
As further improvement, described pneumatic gas filling valve comprises the valve body with axial stepped cavity, form with axial step cavity the ladder spool being sealed and matched, be arranged on the upper end cover at valve body top, be located at the holddown spring between upper end cover and ladder spool, be arranged on valve body bottom and be provided with the bottom end cover that forms the plunger rod being sealed and matched with the cavity of resorption of axial step cavity, the sidewall of described valve body is provided with the control air-source inflow passage being communicated with the epicoele of axial step cavity, described bottom end cover is provided with three gas channels that are communicated with the cavity of resorption of axial step cavity, the lower end of described ladder spool is provided with plunger rod sealing and offsets and then control the resilient seal sprue that three gas channels are communicated with or end with the cavity of resorption of axial step cavity, adopt the pneumatic gas charging valve structure of above structure simple, production cost is low, low cost, and be all suitable for the in the situation that of high-low pressure.
As further improvement, the integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention also comprises the equalizing valve that mutually circulates or end for controlling first passage and second channel, described equalizing valve is arranged on valve plate, described equalizing valve is identical with the structure of pneumatic gas filling valve, when the inner first passage of valve plate and second channel length are when longer, after closing pneumatic gas filling valve and pneumatic abandon valve in the situation that, opening equalizing valve, just can make the detection gas in first passage and second channel reach as early as possible balance.
As further improvement, because first passage is by the first main channel for being communicated with measured workpiece be convenient to the first subaisle I, the first subaisle II, the first subaisle III, the first subaisle IV that pneumatic gas filling valve, pneumatic air release, differential pressure pick-up, pressure transducer be communicated with the first main channel respectively and form, the setting of such the first main channel and many first subaisles, has facilitated each parts to be communicated with the first main channel by corresponding the first subaisle.Because described second channel is by the second main channel for being communicated with volumetric standard be convenient to the second subaisle I, the second subaisle II, the second subaisle III that pneumatic gas filling valve, pneumatic air release, differential pressure pick-up be communicated with the second main channel respectively and form, the setting of such the second main channel and many second subaisles, has facilitated each parts to be communicated with the second main channel by corresponding the second subaisle.Because described detection air-source inflow passage forms with the detection air-source inflow subaisle that detection air-source inflow main channel is communicated with by detecting air-source inflow main channel and being convenient to pneumatic gas filling valve, detect like this setting of air-source inflow main channel and detection air-source inflow subaisle, facilitated pneumatic gas filling valve to be communicated with detection air-source inflow main channel by detecting air-source inflow subaisle.
As further improvement, owing to being also provided with the vertical bleed passage that extends and run through valve plate along valve plate short transverse in described valve plate, the exit of described vertical bleed passage is provided with sound suppressor, after to be detected like this, after pneumatic air release is communicated with vertical bleed passage, detection gas after detection just can, in pneumatic air release enters vertical bleed passage, just can finally flow in atmosphere in the exit of vertical bleed passage and detect gas after sound suppressor noise reduction.
As further improvement, on described first passage, be also provided with and be convenient to the first subaisle V that equalizing valve is communicated with the first main channel, on described second channel, be also provided with and be convenient to the second subaisle IV that equalizing valve is communicated with the second main channel, the setting of the first subaisle V and the second subaisle IV, has facilitated being communicated with of equalizing valve and the first main channel and the second main channel.
As further improvement, the port of three gas channels of described pneumatic gas filling valve is connected with the port of the first subaisle I, the second subaisle I, detection air-source inflow subaisle respectively, simple in structure, easy to connect.
As further improvement, described pneumatic air release is identical with the structure of pneumatic gas filling valve, the port of three gas channels of described pneumatic air release is connected with the port of the first subaisle II, the second subaisle II, vertical bleed passage respectively, pneumatic air release is identical with the structure of pneumatic gas filling valve, equally also simple in structure, production cost is low, low cost, and be all suitable for the in the situation that of high-low pressure.
As further improvement, the port of a gas channel of described equalizing valve is provided with resilient seal and stops up, the port of the two other gas channel of described equalizing valve is connected with the first subaisle V, the second subaisle IV respectively, and the setting that resilient seal stops up can realize the equilibrium activity of equalizing valve.
Accompanying drawing explanation
Fig. 1 is the plan structure schematic diagram that the present invention is applicable to the integrating device of high-low pressure differential pressure Leak Detection.
Fig. 2 is the amplification sectional structure schematic diagram of the valve plate of the present invention's integrating device of being applicable to high-low pressure differential pressure Leak Detection.
Fig. 3 is the amplification sectional structure schematic diagram of the pneumatic gas filling valve of the present invention's integrating device of being applicable to high-low pressure differential pressure Leak Detection.
As shown in the figure: 1, valve plate, 2, pneumatic gas filling valve, 3, pneumatic air release, 4, differential pressure pick-up, 5, pressure transducer, 11, measured workpiece interface, 12, volumetric standard interface, 13, detect gas source interface, 14, equalizing valve, 15, valve body, 16, ladder spool, 17, upper end cover, 18, holddown spring, 19, bottom end cover, 191, plunger rod, 192, gas channel, 20, control air-source inflow passage, 21, resilient seal sprue, 22, vertical bleed passage, 23, resilient seal stops up, and 24, groove, a, first passage, a1, the first main channel, a21, the first subaisle I, a22, the first subaisle II, a23, the first subaisle III, a24, the first subaisle IV, a25, the first subaisle V, b, second channel, b1, the second main channel, b21, the second subaisle I, b22, the second subaisle II, b23, the second subaisle III, b24, the second subaisle IV, c, detect air-source inflow passage, c1, detect air-source inflow main channel, c2, detect air-source inflow subaisle.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1 to Figure 3, the integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention, it comprises valve plate 1, in described valve plate 1, be provided with first passage a for being communicated with measured workpiece (not shown), for the second channel b that is communicated with volumetric standard (the reference workpiece not leaking, this does not show with reference to workpiece in the present embodiment), for the detection air-source inflow passage c with detecting source of the gas and being communicated with.
The integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention also comprise for controlling detect air-source inflow passage c and first passage a and second channel b circulation or the pneumatic gas filling valve 2 ending, for controlling the pneumatic air release 3 of first passage a and second channel b and flow of ambient air or cut-off, for responding to the differential pressure pick-up 4 of differential pressure between first passage a and second channel b, for responding to the pressure transducer 5 of first passage a or second channel b pressure.Described pneumatic gas filling valve 2, pneumatic air release 3, differential pressure pick-up 4, pressure transducer 5 are installed on valve plate 1.
Described first passage a by the first main channel a1 for being communicated with measured workpiece, be convenient to the first subaisle Ia21 that pneumatic gas filling valve 2 is communicated with the first main channel a1, be convenient to the first subaisle IIa22 that pneumatic air release 3 is communicated with the first main channel a1, be convenient to the first subaisle IIIa23 that differential pressure pick-up 4 is communicated with the first main channel a1, be convenient to the first subaisle IVa24 that pressure transducer 5 is communicated with the first main channel a1 and form.Wherein said the first main channel a1 is along the length direction setting of valve plate 1, and in the present embodiment, described the first main channel a1 is a through hole, and the end of this through hole is provided with the plug (not shown) that prevents from detecting gas overflowing.Certainly described the first main channel a1 can also be a blind hole.Described the first subaisle Ia21, the first subaisle IIa22 and the first subaisle IIIa23 form with the horizontal cross passage (unmarked) of the first main channel a1 vertical connection with the Vertical Channel (unmarked) of the end vertical connection of horizontal cross passage by one in addition, described horizontal cross passage is all along the Width setting of valve plate 1, and described Vertical Channel is all along the short transverse setting of valve plate 1.And in the present embodiment, described the first subaisle IVa24 be one directly with the Vertical Channel of the head end vertical connection of the horizontal cross passage of the first subaisle IIa22, this Vertical Channel is along the short transverse setting of valve plate 1.
Described second channel b by the second main channel b1 for being communicated with volumetric standard, be convenient to the second subaisle Ib21 that pneumatic gas filling valve 2 is communicated with the second main channel b1, be convenient to the second subaisle IIb22 that pneumatic air release 3 is communicated with the second main channel b1, be convenient to the second subaisle IIIb23 that differential pressure pick-up 4 is communicated with the second main channel b1 and form.Described the second main channel b1 is also along the length direction setting of valve plate 1, and it is identical with the first main channel a1 that it arranges form.Described the second subaisle Ib21, the second subaisle IIb22 and the second subaisle IIIb23 form with the horizontal cross passage (unmarked) of the second main channel b1 vertical connection with the Vertical Channel (unmarked) of the end vertical connection of horizontal cross passage by one, described horizontal cross passage is all along the Width setting of valve plate 1, and described Vertical Channel is all along the short transverse setting of valve plate 1.
Described detection air-source inflow passage c forms with the detection air-source inflow subaisle c2 that detection air-source inflow main channel c1 is communicated with by detecting air-source inflow main channel c1 and being convenient to pneumatic gas filling valve 2.Described detection air-source inflow main channel c1 is arranged on the inflation end of valve plate, i.e. right-hand member as shown in Figure 2, and detect air-source inflow main channel c1 along the length direction setting of valve plate.Described detection air-source inflow subaisle c2 with detect air-source inflow main channel c1 vertical connection, and vertically arrange along the short transverse of valve plate 1.
As shown in Figure 1, the endpiece of described first passage a is provided with is convenient to the measured workpiece interface 11 that is connected with measured workpiece, the endpiece of described second channel b is provided with is convenient to the volumetric standard interface 12 that is connected with volumetric standard, the inlet end of described detection air-source inflow passage c is provided with to be convenient to and the detection gas source interface 13 that detects source of the gas and be connected, further say so, the endpiece of the first main channel a1 of described first passage a is provided with is convenient to the measured workpiece interface 11 that is connected with measured workpiece, the endpiece of the second main channel b1 of described second channel b is provided with is convenient to the volumetric standard interface 12 that is connected with volumetric standard, the inlet end of the detection air-source inflow main channel c1 of described detection air-source inflow passage c is provided with to be convenient to and the detection gas source interface 13 that detects source of the gas and be connected.
As shown in Figure 2, described pneumatic gas filling valve 2 comprises with the valve body 15 of axial stepped cavity (unmarked), in axial step cavity and and the ladder spool 16, the upper end cover 17 that is arranged on valve body 15 tops that match of axial step cavity shape, be located at holddown spring 18 between upper end cover 17 and ladder spool 16, be arranged on the bottom end cover 19 of valve body 15 bottoms.The lateral wall of the top and the bottom of described ladder spool 16 is provided with annular groove (unmarked), O-ring seals (unmarked) is housed in described annular groove, described O-ring seals is close to the inside surface of axial step cavity all the time, thereby realize ladder spool 16, forms and is sealed and matched with axial step cavity.The middle part of the upper end of described bottom end cover 19 is provided with upwardly extending plunger rod 191, described plunger rod 191 is one-body molded with bottom end cover 19, the lateral wall of described plunger rod 191 is also provided with annular groove (unmarked), O-ring seals (unmarked) is also housed in described annular groove, described O-ring seals is close to the inside surface of the cavity of resorption of axial step cavity all the time, thereby realize plunger rod 191, is sealed and matched with the cavity of resorption formation of axial step cavity.The middle part of the upper end of described ladder spool 16 is provided with groove 24, and 18 of described holddown springs are placed in this groove 24.The sidewall of described valve body 15 is provided with the control air-source inflow passage 20 being communicated with the epicoele of axial step cavity.Described bottom end cover 19 is provided with three gas channels 192 that are communicated with the cavity of resorption of axial step cavity.The lower end of described ladder spool 16 is provided with plunger rod 191 sealings and offsets and then control the resilient seal sprue 21 that three gas channels 192 are communicated with or end with the cavity of resorption of axial step cavity.
The port of three gas channels 192 of described pneumatic gas filling valve 2 is connected with the port of the first subaisle Ia21, the second subaisle Ib21, detection air-source inflow subaisle c2 respectively, further say so, the port of three gas channels 192 of described pneumatic gas filling valve 2 respectively with the port of Vertical Channel of the first subaisle Ia21, the port of the Vertical Channel of the second subaisle Ib21, the port that detects air-source inflow subaisle c2 be connected.
In described valve plate 1, be also provided with the vertical bleed passage 22 that extends and run through valve plate 1 along valve plate 1 short transverse, the exit of described vertical bleed passage 22 is provided with sound suppressor (not shown).Described pneumatic air release 3 is identical with the structure of pneumatic gas filling valve 2.The port of three gas channels 192 of described pneumatic air release 3 is connected with the port of the first subaisle IIa22, the second subaisle IIb22, vertical bleed passage 22 respectively, further say so, the port of three gas channels 192 of described pneumatic air release 3 respectively with the port of Vertical Channel of the first subaisle IIa22, the port of the Vertical Channel of the second subaisle IIb22, vertically the port of bleed passage 22 is connected.
As improvement project of the present invention, the integrating device that is applicable to high-low pressure differential pressure Leak Detection of the present invention also comprises the equalizing valve 14 that mutually circulates or end for controlling first passage a and second channel b, and described equalizing valve 14 is arranged on valve plate 1.
As improvement project of the present invention, on described first passage a, be also provided with and be convenient to the first subaisle Va25 that equalizing valve 14 is communicated with the first main channel a1, this first subaisle Va25 forms with the horizontal cross passage (unmarked) of the first main channel a1 vertical connection with the Vertical Channel (unmarked) of the end vertical connection of horizontal cross passage by one, described horizontal cross passage is along the Width setting of valve plate 1, and described Vertical Channel is along the short transverse setting of valve plate 1.On described second channel b, be also provided with and be convenient to the second subaisle IVb24 that equalizing valve 14 is communicated with the second main channel b1, this second subaisle IVb24 forms with the horizontal cross passage (unmarked) of the second main channel b1 vertical connection with the Vertical Channel (unmarked) of the end vertical connection of horizontal cross passage by one, described horizontal cross passage is also along the Width setting of valve plate 1, and described Vertical Channel is also along the short transverse setting of valve plate 1.
Described equalizing valve 14 is identical with the structure of pneumatic gas filling valve 2.The port of a gas channel 192 of described equalizing valve 14 is provided with resilient seal and stops up 23, that is to say that this gas channel 192 is cut off not circulate.The port of the two other gas channel 192 of described equalizing valve 14 is connected with the first subaisle Va25, the second subaisle IVb24 respectively, further say so, the port of the two other gas channel 192 of described equalizing valve 14 is connected with the port of Vertical Channel of the first subaisle Va25, the port of the Vertical Channel of the second subaisle IVb24 respectively.
In the present embodiment, the control gas of the detection gas of detection source of the gas and control source of the gas is two kinds of gases that pressure is different.
The specific works principle of pneumatic gas filling valve 2 that the present invention is applicable to the integrating device of high-low pressure differential pressure Leak Detection is: the control gas of controlling source of the gas enters into from the control air-source inflow passage 20 of valve body 15 in the epicoele of axial step cavity of valve body 15, now thereby the gaseous tension of epicoele inside increases promotion ladder spool 16 upward slidings, ladder spool 16 upward slidings drive resilient seal sprue 21 and then to move up, resilient seal sprue 21 departs from three gas channels 192 of bottom end cover 19, 192 whiles of three gas channels are communicated with the cavity of resorption of the axial step cavity of valve body 15, now three gas channels 192 are also interconnected, the detection gas that detects source of the gas so all can be given vent to anger from two other gas channel 192 gas outlets from the air intake opening air inlet of any gas channel 192 of pneumatic gas filling valve 2.And when the control gas of cutting-off controlling source of the gas, ladder spool 16 is down sliding under the acting force of holddown spring 18, drive resilient seal sprue 21 to compress three gas channels 192 of bottom end cover 19, make three gas channels 192 recover each other initial obstructed state, now the detection gas gas circuit of pneumatic gas filling valve 2 is cut off, and so far completes a course of work.
Described pneumatic air release 3 is identical with the principle of work of pneumatic gas filling valve 2 with equalizing valve 14, therefore be not described in detail in this.
The testing process of integrating device that the present invention is applicable to high-low pressure differential pressure Leak Detection is as follows:
1, measured workpiece is connected with the measured workpiece interface 11 on valve plate 1, volumetric standard is connected with the volumetric standard interface 12 on valve plate 1.
2, the detection gas that detects source of the gas is passed in valve plate 1 from the detection air-source inflow passage c of valve plate 1, open pneumatic gas filling valve 2, detect gas and by pneumatic gas filling valve 2, enter first passage a and the second channel b of valve plate 1, so the first passage a of valve plate 1 and second channel b are connected with detection gas.Pressure transducer 5 is responded to the detection gaseous tension being filled with in demonstration valve plate 1, in case pressure is excessive.
3, close gas filling valve, open and be positioned at the middle equalizing valve 14 of valve plate 1, make the pressure of measured workpiece and volumetric standard reach fast consistent.
4, after equilibration time finishes, close equalizing valve 14, now first passage a and second channel b are not interconnected, and differential pressure pick-up 4 inductions detect the pressure difference value between first passage a and second channel b, thereby obtain leakage rate.
5, after detection finishes, open pneumatic air release 3, all detection gas enters vertical bleed passage 22 by pneumatic air release 3 and realizes venting, so far completes the detection that a differential pressure is leaked.

Claims (9)

1. an integrating device that is applicable to high-low pressure differential pressure Leak Detection, it is characterized in that: it comprises valve plate (1), in described valve plate (1), be provided with first passage (a) for being communicated with measured workpiece, for the second channel (b) that is communicated with volumetric standard, for the detection air-source inflow passage (c) with detecting source of the gas and being communicated with;
It also comprises the pneumatic gas filling valve (2) that detects air-source inflow passage (c) and first passage (a) and second channel (b) circulation or cut-off for controlling, be used for controlling the pneumatic air release (3) of first passage (a) and second channel (b) and flow of ambient air or cut-off, be used for responding to the differential pressure pick-up (4) of differential pressure between first passage (a) and second channel (b), be used for responding to the pressure transducer (5) of first passage (a) or second channel (b) pressure, described pneumatic gas filling valve (2), pneumatic air release (3), differential pressure pick-up (4), pressure transducer (5) is installed on valve plate (1),
Described first passage (a) is by the first main channel (a1) for being communicated with measured workpiece and be convenient to the first subaisle I (a21), the first subaisle II (a22), the first subaisle III (a23), the first subaisle IV (a24) formation that pneumatic gas filling valve (2), pneumatic air release (3), differential pressure pick-up (4), pressure transducer (5) are communicated with the first main channel (a1) respectively;
Described second channel (b) is by the second main channel (b1) for being communicated with volumetric standard and be convenient to the second subaisle I (b21), the second subaisle II (b22) and the second subaisle III (b23) formation that pneumatic gas filling valve (2), pneumatic air release (3), differential pressure pick-up (4) are communicated with the second main channel (b1) respectively;
Described detection air-source inflow passage (c) is by detecting air-source inflow main channel (c1) and being convenient to detection air-source inflow subaisle (c2) formation that pneumatic gas filling valve (2) is communicated with detection air-source inflow main channel (c1).
2. the integrating device that is applicable to high-low pressure differential pressure Leak Detection according to claim 1, is characterized in that: the endpiece of described first passage (a) is provided with is convenient to the measured workpiece interface (11) that is connected with measured workpiece; The endpiece of described second channel (b) is provided with is convenient to the volumetric standard interface (12) that is connected with volumetric standard; The inlet end of described detection air-source inflow passage (c) is provided with to be convenient to and the detection gas source interface (13) that detects source of the gas and be connected.
3. the integrating device that is applicable to high-low pressure differential pressure Leak Detection according to claim 1, it is characterized in that: described pneumatic gas filling valve (2) comprises the valve body (15) with axial stepped cavity, form with axial step cavity the ladder spool (16) being sealed and matched, be arranged on the upper end cover (17) at valve body (15) top, be located at the holddown spring (18) between upper end cover (17) and ladder spool (16), be arranged on valve body (15) bottom and be provided with the bottom end cover (19) that forms the plunger rod (191) being sealed and matched with the cavity of resorption of axial step cavity, the sidewall of described valve body (15) is provided with the control air-source inflow passage (20) being communicated with the epicoele of axial step cavity, described bottom end cover (19) is provided with three gas channels (192) that are communicated with the cavity of resorption of axial step cavity, the lower end of described ladder spool (16) is provided with plunger rod (191) sealing and offsets and then control the resilient seal sprue (21) that three gas channels (192) are communicated with or end with the cavity of resorption of axial step cavity.
4. the integrating device that is applicable to high-low pressure differential pressure Leak Detection according to claim 3, it is characterized in that: it also comprises the equalizing valve (14) that mutually circulates or end for controlling first passage (a) and second channel (b), it is upper that described equalizing valve (14) is arranged on valve plate (1), and described equalizing valve (14) is identical with the structure of pneumatic gas filling valve (2).
5. the integrating device that is applicable to high-low pressure differential pressure Leak Detection according to claim 1, it is characterized in that: in described valve plate (1), be also provided with the vertical bleed passage (22) that extends and run through valve plate (1) along valve plate (1) short transverse, the exit of described vertical bleed passage (22) is provided with sound suppressor.
6. according to the integrating device that is applicable to high-low pressure differential pressure Leak Detection described in claim 1 or 4, it is characterized in that: on described first passage (a), be also provided with and be convenient to the first subaisle V (a25) that equalizing valve (14) is communicated with the first main channel (a1), on described second channel (b), be also provided with and be convenient to the second subaisle IV (b24) that equalizing valve (14) is communicated with the second main channel (b1).
7. according to the integrating device that is applicable to high-low pressure differential pressure Leak Detection described in claim 1 or 3, it is characterized in that: the port of three gas channels (192) of described pneumatic gas filling valve (2) is connected with the port of the first subaisle I (a21), the second subaisle I (b21), detection air-source inflow subaisle (c2) respectively.
8. according to the integrating device that is applicable to high-low pressure differential pressure Leak Detection described in claim 1 or 3 or 5, it is characterized in that: described pneumatic air release (3) is identical with the structure of pneumatic gas filling valve (2), the port of three gas channels (192) of described pneumatic air release (3) is respectively with the first subaisle II (a22), the second subaisle II (b22), vertically the port of bleed passage (22) is connected.
9. the integrating device that is applicable to high-low pressure differential pressure Leak Detection according to claim 6, it is characterized in that: the port of a gas channel (192) of described equalizing valve (14) is provided with resilient seal and stops up (23), and the port of the two other gas channel (192) of described equalizing valve (14) is connected with the first subaisle V (a25), the second subaisle IV (b24) respectively.
CN201110280997.7A 2011-09-21 2011-09-21 Integrated device applicable to differential pressure leakage detection of high/low pressures Expired - Fee Related CN102435403B (en)

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