CN2299307Y - throwing static pressure liquid level transmitter - Google Patents
throwing static pressure liquid level transmitter Download PDFInfo
- Publication number
- CN2299307Y CN2299307Y CN 97202578 CN97202578U CN2299307Y CN 2299307 Y CN2299307 Y CN 2299307Y CN 97202578 CN97202578 CN 97202578 CN 97202578 U CN97202578 U CN 97202578U CN 2299307 Y CN2299307 Y CN 2299307Y
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- China
- Prior art keywords
- static pressure
- sealing
- sensor
- type static
- level transmitter
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- Expired - Fee Related
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to a throwing type static pressure liquid level transmitter which detects and measures liquid level. The utility model is characterized in that the scheme of dew condensation is that a sealing fork head is adopted, one end of the fork head is connected with a connecting pipe, the other end connects in a water guide pipe which is arranged on the lower part of a shell body, the upper end of the connecting pipe is inserted in a back pressure air guiding short pipe, and the other end of the connection pipe is communicated with an atmospheric back pressure air guiding pipe. A sensor is hidden in the middle part of the shell body, and is assembled with an entrance pressure hole through a vertical position, and a circuit is additionally provided with a potentiometer which is used for adjusting the zero point and the full range of a transmitter. The shell body is divided into an upper shell, a middle shell and a lower shell, and multiple sealing and fixation of the components among shell bodies and in shell cavities can proceed through the adoption of a conventional technology. The utility model has the advantages that the throwing type static pressure liquid level transmitter is free from the effect of dew condensation, performance is stable and reliable, precision is high, the zero point and the full range are adjustable, the utility model is not easy to plug by silt, etc.
Description
The utility model is a kind of electronic device series products that can detect and measure liquid level, can be widely used in places such as dam, power station, reservoir, chemical industry.
This series products cardinal principle is by liquid this non electrical quantity of pressure size variation (depth of liquid level changes) to its sensor diaphragm impression, it is converted to according to certain rules be convenient to the electric weight that transmits and handle, by gathering the variation of electric weight, realize detection and metering again to liquid level.According to this principle, the commercial like product mainly is by sensor at present, sensor control circuit, and open to atmosphere sensor back pressure wireway and encapsulating housing constitute.The wiring board that sensor control circuit wherein is housed places the middle part of housing, and sensor places lower part of frame, and housing is provided with an entrance pressure hole that connects.The dewfall in the wireway that sensor back pressure wireway causes because of variation of ambient temperature is got rid of in this design owing to fail, moisture after the dewfall and water droplet influence precision or output drift, make that this product mean lifetime is very short, cause sensor and wiring board to make moist and can't operate as normal.Sensor is arranged on the bottom of complete machine in addition, when turning on bottom, very easily damages the diaphragm of sensor.The entire product housing adopts one-piece construction simultaneously, overlaps on its upper end cover one rubber, and an entrance pressure head is adorned in the lower end, only establishes the sealing defence line one, and sealing effectiveness is relatively poor.Secondly entrance pressure Kongzui major diameter is φ 3.6mm, is easily stopped up by silt.Moreover do not take to adjust the setting of transmitter zero point and full scale in the silicon sensor control circuit of this series products, can't guarantee the adjustment of transmitter precision.Therefore although this product is with convenient easy, cost is low, and precision is high to attract numerous users, in rugged surroundings or require in the application of long-term reliability, almost seldom uses.
The purpose of this utility model is to provide a kind of good seal performance, not influenced by back pressure wireway dewfall, the transmitter precision can be adjusted, the entrance pressure hole is difficult for being stopped up, being convenient to clean by silt, stable and reliable working performance and have the throw-in type static pressure fluid level transmitter of condensation detecting function.
Principle of work of the present utility model is similar with existing like product, promptly
P＝ρgh+Pe (1)
Wherein, ρ is a fluid to be measured density, and g is a local gravitational acceleration, and h is the depth distance of this liquid level to liquid level.Pe is the atmospheric pressure that liquid level top pressure deducts an environment of living in, when Pe=0, proves that liquid level top and atmosphere communicate.So in measuring reservoir, pond and industrial open-top receptacle, h=P/0.0989 ρ.
In the container that the utility model input is filled with liquid or reservoir, well, oil tank etc. locate, and by after the installation of tram, liquid increases, its liquid level will change when subtracting, pressure P effect is promptly arranged, this effect can be passed through sensor interior diaphragm deformation-sensing, pressure is changed being delivered on the silicon chip of Wheatstone bridge I in the sensor control circuit, and strain resistor changes in the bridge circuit at this moment, thereby destroyed the equilibrium state of electric bridge, sensor is exported a voltage differential signal
Δ V=K
1P (2) wherein, K
1Be scale-up factor.
When Δ V signal output 4～20mA current signal after electronic circuit is handled,
I
0=4+K
2Δ V (3) wherein, K
2Be scale-up factor,
Formula (1), formula (2) substitution formula (3) can be got:
I
0＝4+K
1K
2ρghmA
Be constant when being in certain place g, when ρ is constant, output current I
0Will be with following formula and liquid level h relation in direct ratio, the utility model just is liquid level to be detected and calculates after converting by the variation of gathering electric weight.
The utility model still mainly is made of sensor, sensor control circuit, open to atmosphere sensor back pressure wireway and encapsulating housing, also is provided with an entrance pressure hole that connects on the housing.But be characterised in that the water conservancy diversion setting of having implemented the back pressure wireway in the housing, this setting includes takes over 14, back pressure air guide short tube 26, rubber seal jaw 27 and aqueduct 28.It is connected to, one end of adapter 14 is connected with the back pressure wireway 15 in the cable 18, the other end is connected with sealing jaw 27, the lower end of sealing jaw 27 is connected with the upper end of aqueduct 28, the lower end of aqueduct 28 is led in the shell volume sap cavity, and the upper end of sealing jaw 27 also connects an open to atmosphere back pressure air guide short tube 26.
Structural design features of the present utility model is that it is a upper casing 16 with case design, mesochite 7 and lower casing 1 three parts, and other comprises the upward cover 17 supporting with upper casing, this four part all adopts routine techniques to be connected and sealed each other.Wherein upward a hole is opened at cover 17 tops, passes the cable 18 that contains sensor back pressure wireway 15, seals the sensor 10 of packing in the mesochite 7 in the cavities, and disposes with the 9 one-tenth vertical direction of tracting pressuring hole that run through the housing middle part.The aperture in entrance pressure hole 9 can be selected between φ 10～20mm.Also be provided with transmitter control circuit and the used circuit board module 29 of dewfall detection circuit in the mesochite 7 lower end cavitys, be provided with hydrops box 34 in the lower casing.
All adopt routine techniques sealing and fixing in the utility model enclosure interior chamber between each critical piece.As: adopt routine techniques to handle to go up the cable that passes in the cover 17 18 sealing and the fixation problem mutual with it; Sealing and fixation problem that the cable that adopts conventional Sealing Technology to handle to pass in the upper casing 15 18 is mutual with it; Adopt the circuit board module 29 of routine techniques sealing and fixing in mesochite 7 lower chamber, and adopt routine techniques fixedly to pass aqueduct 28 in mesochite cavity, the insertion cavity of resorption chamber, and make between itself and miscellaneous part and seal.
The utility model has been set up the potentiometer W that the zero point and the full scale of transmitter are adjusted in the converter control circuit of transmitter
1And W
2W wherein
1Be connected W with 1,2 terminals of the medium and small signal converter V of circuit
114 terminals of movable termination V.W
26 terminals of a termination V, W
2The other end be connected 5 terminals that V is inserted in the back with movable end.When this product when in use some parameter changes, adjust potentiometer W
1, W
2, guarantee user's service precision.
The utility model also addition the condensation sniffer, it is by the condensation probe node C, the C ' that are arranged in the hydrops box removably 34, the lead 35 of coupled knot, and constitute through the dewfall detection circuit that lead connects.The condensation probe node disconnects at ordinary times, and when the full box of hydrops, two probe node conductings are also reported to the police through the detection circuit that is communicated with device taking alarm, treats to recover normal during dew emptying in the hydrops box.
The utility model has adopted the multiplication technique for temperature compensation for preventing because of the sensor temperature drift influences accuracy of detection, is specially and has selected a kind of sensor with the low high resistant heat-sensitive electronic component of temperature coefficient.
Design of the present utility model has reached aforementioned purpose, has provided a kind of good seal performance that has, and temperature stability reaches sensor well and not influenced by dewfall, detects and the measuring accuracy height, has the practical product of performances such as condensation detection and transmitter precision be adjustable.
Because employing places housing middle part and built-in configuration, avoided the mechanical damage of sensor diaphragm in the utility model sensor installation and design.In addition owing to adopt the large aperture tracting pressuring hole and, guaranteed that High-Pressure Water can vertically not act on the diaphragm, has prevented the distortion of diaphragm with itself and sensor arranged perpendicular.
Description of drawings:
Fig. 1: the utility model structural drawing; 13 is the electric wire card extender, and 19 for protecting the line plastic tube, and B, B ' are the jaw of lead 35 devices taking alarm, and A, A ' are for connecing the 24V supply lines jaw of sensor control circuit.
The A of Fig. 2: Fig. 1 is to sectional view;
Fig. 3: commercially available like product structural drawing; 39 is the rubber foundry goods, and 40 is shell, and 41 is wiring board, and 42 is transition piece, and 43 is stopper ring, and 44 is the entrance pressure head, and 45 is stainless-steel tube;
Fig. 4: the utility model sensor control circuit schematic diagram.I is a Wheatstone bridge.
Embodiment:
The utility model primary structure design and assembling as previously mentioned, its each several part specific embodiments is: the sealing between the housing each several part is routine techniques, on overlap 17 and be rubber parts, its endoporus has the ring-type O type circle R of projection
1With upper casing 16 middle concave groove R
2Closely connect; For cable 18 is drawn, on overlap 17 tops and open a hole close-fitting with it; Upper casing 16 and mesochite 7 also adopt electro-beam welding method to live from the outside weldering except that with being threaded; Mesochite 7 lower ends put O type ring 33 and tighten with lower casing 1.
The embodiment of sealing and fixing is between each structure of enclosure interior: use first compressing tablet 23, sealing rubber ring 24, pad 25 lockings that locknut 22 will set gradually from top to down in upper casing 16 upper chambers, with the cable 18 that seals and fixedly pass; Impaired for preventing diaphragm, ensconce the mesochite middle part in sensor 10 usefulness, one circlip for hole 12 and 11 sealings of O type ring, and become arranged perpendicular with the tracting pressuring hole of a φ 14mm; For sealing and fix the circuit board module 29 that is configured in the mesochite lower cavity, with locknut 2 is with bowl type circle 6 down, sealing bush 3 is locked herein; Have 3 holes on the sealing bush 3, wherein two holes 37 are configuration potentiometer W
1, W
2The adjustment hole, tighten sealing with sealed screw 4 and little O type circle 5, another hole 38 is used O-ring seal 30 and little locknut 31 sealing and fixing herein for inserting and the fixing lower end of aqueduct 28.
The dewfall processing scheme is will take over an end of 14 to be connected with wireway 15 in the cable 18, the other end is connected with rubber seal jaw 27, after the lower end of sealing jaw puts aqueduct 28, sealing in the hole 8 of insertion φ 5mm, aqueduct 28 lower ends are by aforementioned sealing and fixing and insert in the lower casing hydrops box, and a back pressure air guide short tube 26 straight-through atmosphere are injected in sealing jaw 27 upper ends.Change with operating ambient temperature, in case dewfall is arranged, water droplet flows in the hydrops box 34 along aqueduct, when the liquid overfill, condensation probe node C, the closed conducting of C ', signal is carried out warning function through lead 35 logical detection circuits device taking alarm, after the maintenance personal backs out lower casing 1 and discharges water, report to the police and finish.Lead 35 is sealed by sealing-plug 36 jam-packs.
The utility model is selected a kind of diffusion silicon pressure sensor that adopts the constant current power supply, and sensor control circuit is seen Fig. 4, and this is a kind of custom circuit, and it is XRT101 that the medium and small signal converter V of the utility model selects model for use, wherein adjusts potentiometer W zero point
1Two ends connect 1,2 terminals of XRT101, W respectively
1Adjustable end connects 14 terminals; Full scale is adjusted potentiometer W
2Connect 5 terminals of XRT101 after adjusting end and wherein an end being connected, 6 terminals of another termination XRT101.Triode BG
1Model is BT458; Sensor relies on circuit working, and the complete machine marking current is 4～20mA, and signal wire and supply lines are public in the sensor control circuit, claims two-wire system.When product when in use circuit parameter changes, lower casing and the sealed screw 4 convenient potentiometer W that adjust at any time can back-out
1And W
2, guarantee accuracy of detection.
Claims (8)
1. throw-in type static pressure fluid level transmitter that liquid level is detected and measures, comprise silicon sensor, sensor control circuit, open to atmosphere sensor back pressure wireway and encapsulating housing, housing is provided with an entrance pressure hole that connects, of the present utility model being characterised in that: be provided with back pressure wireway guiding device, it includes adapter (14), back pressure air guide short tube (26), sealing jaw (27) and aqueduct (28), an end of taking over (14) is connected with back pressure wireway (15), the other end is connected with sealing jaw (27), the lower end of sealing jaw (27) is connected with aqueduct (28) upper end, insert in the lower housing portion fluid collection chamber aqueduct (28) lower end, and the upper end of sealing jaw (27) also connects an open to atmosphere back pressure air guide short tube (26).
2. throw-in type static pressure fluid level transmitter according to claim 1, it is characterized in that: described housing is the upward cover (17) that is tightly connected by routine techniques, upper casing (16), mesochite (7) and lower casing (1) constitute, wherein, a hole is opened at last cover top, pass the cable (18) that contains sensor back pressure wireway (15), seal the sensor (10) of packing in the mesochite (7) in the cavities, and become vertical direction to dispose with the entrance pressure hole (9) of running through housing middle part, be provided with the used circuit board module (29) of sensor control circuit and dewfall detection circuit in mesochite (7) lower cavity, be provided with hydrops box (34) in the lower cavity.
3. throw-in type static pressure fluid level transmitter according to claim 1 and 2, it is characterized in that: adopt the routine techniques sealing and fixedly cooperatively interact go up cover (17) and cable (18), and upper casing (16) and cable (18), adopt routine techniques sealing and the circuit board module (29) that fixedly is provided with in mesochite (7) lower chamber and pass aqueduct (28) in the mesochite insertion lower casing chamber.
4. throw-in type static pressure fluid level transmitter according to claim 1 and 2 is characterized in that: the aperture that is located at the entrance pressure hole (9) at transmitter middle part is φ 10～20mm.
5. throw-in type static pressure fluid level transmitter according to claim 1 and 2 is characterized in that: adopting model in the transmitter control circuit is the small-signal transducer V of XTR101, and 1,2,14 terminals of V insert the potentiometer W of an adjustment transmitter current potential at zero point
1, 5,6 terminals of V insert the potentiometer W of an adjustment transmitter full scale
2
6. throw-in type static pressure fluid level transmitter according to claim 1 and 2 is characterized in that: have configuration and adjust potentiometer W on sealing bush (3)
1, W
2Adjustment hole (37), W
1, W
2With sealed screw (4) and little O type circle (5) sealing and fixing.
7. throw-in type static pressure fluid level transmitter according to claim 1 and 2 is characterized in that: the utility model has been selected a kind of sensor with the low high resistant heat-sensitive electronic component of temperature coefficient.
8. throw-in type static pressure fluid level transmitter according to claim 1 and 2 is characterized in that: be provided with two condensation probe node C, C ' in the described hydrops box (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202578 CN2299307Y (en) | 1997-03-27 | 1997-03-27 | throwing static pressure liquid level transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202578 CN2299307Y (en) | 1997-03-27 | 1997-03-27 | throwing static pressure liquid level transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2299307Y true CN2299307Y (en) | 1998-12-02 |
Family
ID=33923698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97202578 Expired - Fee Related CN2299307Y (en) | 1997-03-27 | 1997-03-27 | throwing static pressure liquid level transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2299307Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312462C (en) * | 2004-12-31 | 2007-04-25 | 北京塞尔瑟斯仪表科技有限公司 | Two-wire system multiple sensors liquid level transmitting instrument |
| CN102506959A (en) * | 2011-10-18 | 2012-06-20 | 中环天仪股份有限公司 | Sensor assembly |
| CN105509838A (en) * | 2016-01-18 | 2016-04-20 | 广东伟创科技开发有限公司 | Throw-in type sensor |
| CN106353026A (en) * | 2016-08-12 | 2017-01-25 | 山东佰测传感科技股份有限公司 | Pressure instrument with excellent damp-proof function |
| CN112710583A (en) * | 2020-12-28 | 2021-04-27 | 中国人民解放军92493部队计量测试研究所 | Electrolyte density measuring device |
-
1997
- 1997-03-27 CN CN 97202578 patent/CN2299307Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312462C (en) * | 2004-12-31 | 2007-04-25 | 北京塞尔瑟斯仪表科技有限公司 | Two-wire system multiple sensors liquid level transmitting instrument |
| CN102506959A (en) * | 2011-10-18 | 2012-06-20 | 中环天仪股份有限公司 | Sensor assembly |
| CN102506959B (en) * | 2011-10-18 | 2013-05-29 | 中环天仪股份有限公司 | Sensor assembly |
| CN105509838A (en) * | 2016-01-18 | 2016-04-20 | 广东伟创科技开发有限公司 | Throw-in type sensor |
| CN106353026A (en) * | 2016-08-12 | 2017-01-25 | 山东佰测传感科技股份有限公司 | Pressure instrument with excellent damp-proof function |
| CN112710583A (en) * | 2020-12-28 | 2021-04-27 | 中国人民解放军92493部队计量测试研究所 | Electrolyte density measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| MM1K | Cease caused by non payment of annual fee |