CN2440204Y - Probe of level transducer - Google Patents
Probe of level transducer Download PDFInfo
- Publication number
- CN2440204Y CN2440204Y CN 00254932 CN00254932U CN2440204Y CN 2440204 Y CN2440204 Y CN 2440204Y CN 00254932 CN00254932 CN 00254932 CN 00254932 U CN00254932 U CN 00254932U CN 2440204 Y CN2440204 Y CN 2440204Y
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- Prior art keywords
- probe
- nut
- center
- weight
- layer
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- Expired - Fee Related
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Abstract
The utility model relates to a capacitance type probe of a level transducer, wherein a central probe and a probe connector can be connected detachably, and joint part of the central probe and the probe connector and the whole probe connector are covered with a central insulating layer, a metal shielding layer, a shielding insulation layer and a metal ground layer from inside to outside in turn. The utility model can be connected with a transmitting module of a transmitter through a conventional shielding cable to realize split type installation with modules of the transmitter, and moreover, the distributed capacitances of the cable and the probe of the utility model is not affected by changes of the temperature. The utility model is broadly applicable to being used for level gauging of various surroundings and various material media.
Description
The utility model relates to a kind of probe of level transmitter, specially refers to a kind of probe of capacitance object position transmitter.
In existing capacitance object position transmitter probe, for the measuring height height, or existence is harmful to and application scenario inflammable, explosion hazard gases around the transmitter, the transmitter transmitting module can adopt partial installation with probe, just need the probe with transmitting module between be connected with cable, and the distributed capacitance of this stube cable is very big, and its distributed capacitance is subject to influence of temperature change, and the cable distribution electric capacity of this variation and material dielectric capacitance are superimposed and can cause very big output signal error.Specific inductive capacity smaller applications occasion for the material medium, the electric capacity that forms between medium and probe and the canister is less, relatively very big from the output terminal of transmitting module to the electric capacity that distributes the measurement upper limit of probe, the electric capacity that distributes on this section is vulnerable to influence of temperature change, and the distributed capacitance of this variation and material dielectric capacitance are superimposed also can produce very big output signal error.
When being used to measure some media with thickness, easily fouling, working time one is long, the progressively thickening of bridging, fouling will pop one's head in the upper end and the whole covering of container upper wall, bridging will be popped one's head in to fuse with the container upper wall, form full bridging state, the ground plane of probe will extend to whole bridging layer this moment, make effective capacitance expand to the bridging top, thereby oscillating voltage in the transmitting module in the transmitter is worn down, make output signal produce very mistake.
The purpose of this utility model can be eliminated the probe of the level transmitter of full bridging state capacitive effect simultaneously for providing a kind of temperature difference of eliminating to measuring capacitive effect.
The utility model is achieved in that and includes: probe joint, center probe, realize removably connecting between probe joint and the center probe, the other end of probe joint is provided with securing member, be coated with central insulation layer and metal ground plane from the inside to the outside successively in center probe and probe joint linkage section part and whole probe joint, between above-mentioned central insulation layer and metal ground plane, also be provided with metal screen layer and shield dielectric layer, the described two-layer central insulation layer that also coats successively from the inside to the outside.
The metal screen layer end of center probe is provided with the screen layer closing means, its structure is as follows: the sealing nut is located on the probe of center, the head of sealing nut is connected with metal screen layer, the thread segment of sealing nut is threaded with closed nut, between sealing nut, closed nut and center probe nonmetal sealing separation layer is set.
Not end at the center probe also is provided with weight mechanism, one weight is attached thereto, the structure of weight mechanism is as follows: the weight nut is located on the probe of center, the not end of weight nut blocked center probe also is threaded with the weight nut, and weight nut, weight nut are provided with nonmetal weight separation layer between popping one's head in the center.
Because this kind probe is provided with metal screen layer between original central insulation layer and metal ground plane, and between metal screen layer and metal ground plane, be provided with shield dielectric layer, so, all have the signal shielding effect from measuring the upper limit to being screen layer closing means position between the transmitter module output terminal till the joint of popping one's head in.As drawing an amplifier in the bridge diagram in transmitter module, the output terminal of this amplifier is connected by cable shield with the probe metal screen layer, the center probe connects amp.in by cable tracer, metal ground plane is connected with ground wire, this Amplifier Gain is " 1 ", output signal and input signal equipotential, equiphase, same frequency, but isolate mutually.So no matter be between metal screen layer on the probe is popped one's head in the center, still all there is above-mentioned relation between the screen layer of cable and the cable tracer, and do not have electric current to flow through between the two, promptly do not have electric current to spill, be equivalent to not have electric capacity or electric capacity to equal zero between the two from the center probe.Though metal screen layer and metal ground plane have electric current to flow through, this electric current is not measured, and therefore: the temperature effect of probe and cable just can not exert an influence.
In like manner, owing to introduce an amplifier, make center probe and metal screen layer have above-mentioned relation, therefore will pop one's head in and the container upper wall fuses that forming expires under the bridging state when measuring media, though have the bridging layer to exist between center probe and the metal screen layer, but do not have electric current to flow through between them, and metal screen layer and chamber wall (ground plane) be though there is electric current to flow through, this electric current is not measured, so under full bridging state, can not exert an influence to the transmitter output signal yet.
The screen layer closing means is the endcapped with metal screen layer, and to prevent the material medium, the material medium that has certain pressure especially enters probe inside.The existing sealing probe of the effect of weight mechanism end effect has the effect of the weight of connection again.
Fig. 1 is the structural representation of a kind of embodiment of the present utility model.
Fig. 2 is the structural representation of another kind of embodiment of the present utility model.
Below in conjunction with embodiment the utility model is further described.
Figure 1 shows that a rigid probe.Probe joint 2 is popped one's head in the center and is threaded between 11.The center probe is coated with central insulation layer 1, metal screen layer 3, shield dielectric layer 4, metal ground plane 5 from the inside to the outside successively with the linkage section part and the whole probe joint of probe joint.In the joint of above-mentioned center probe with the probe joint, between the peripheral metal screen layer of this joint and central insulation layer, joint sealing cover 6 and joint sealing lid 7 are set, both dock and are nonmetallic materials.The metal screen layer end of center probe is provided with the screen layer closing means, its structure is as follows: sealing nut 8 is located on the probe of center, the head of sealing nut is connected with metal screen layer, the thread segment of sealing nut is threaded with closed nut 10, between sealing nut, closed nut and center probe nonmetal sealing separation layer 9 is set.
Figure 2 shows that a flexible probe, because of flexible probe must hang a weight 16 at its end, so the not end of popping one's head at the center also is provided with weight mechanism and links to each other with weight 16, the structure of weight mechanism is as follows: weight nut 14 is located on the probe of center, the not end of weight nut 15 blocked centers probes also is threaded with the weight nut, the other end of weight nut is provided with threaded hole, weight is threaded with it by this hole, the weight nut, be provided with nonmetal weight separation layer 12 between weight nut and the center probe, also be provided with becket 13 between weight separation layer and the probe, this becket is welded in the center probe and goes up and coated by weight separation layer 12.
Claims (3)
1. the probe of a level transmitter, include: probe joint (2), center probe (11), realize removably connecting between probe joint and the center probe, the other end of probe joint is provided with securing member, be coated with central insulation layer (1) and metal ground plane (5) from the inside to the outside successively in center probe and probe joint linkage section part and whole probe joint, it is characterized in that: between above-mentioned central insulation layer (1) and metal ground plane (5), also be provided with metal screen layer (3) and shield dielectric layer (4), the described two-layer central insulation layer (1) that also coats successively from the inside to the outside.
2. the probe of level transmitter as claimed in claim 1, it is characterized in that: metal screen layer (3) end of center probe is provided with the screen layer closing means, its structure is as follows: sealing nut (8) is located on the probe of center, the head of sealing nut is connected with metal screen layer, the thread segment of sealing nut is threaded with closed nut (10), between sealing nut, closed nut and center probe nonmetal sealing separation layer (9) is set.
3. the probe of level transmitter as claimed in claim 1 or 2, it is characterized in that: the not end at center probe (11) also is provided with weight mechanism, one weight (16) is attached thereto, the structure of weight mechanism is as follows: weight nut (14) is located on the probe of center, the not end of weight nut (15) blocked center probe also is threaded with the weight nut, and weight nut, weight nut are provided with nonmetal weight separation layer (12) between popping one's head in the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00254932 CN2440204Y (en) | 2000-09-14 | 2000-09-14 | Probe of level transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00254932 CN2440204Y (en) | 2000-09-14 | 2000-09-14 | Probe of level transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2440204Y true CN2440204Y (en) | 2001-07-25 |
Family
ID=33612066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00254932 Expired - Fee Related CN2440204Y (en) | 2000-09-14 | 2000-09-14 | Probe of level transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2440204Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401677A (en) * | 2010-09-08 | 2012-04-04 | 成都泛华航空仪表电器有限公司 | Compound oil level sensor |
| CN104406657A (en) * | 2014-12-12 | 2015-03-11 | 天津市诺华自控技术有限公司 | Anti-hitting probing rod of level switch |
-
2000
- 2000-09-14 CN CN 00254932 patent/CN2440204Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401677A (en) * | 2010-09-08 | 2012-04-04 | 成都泛华航空仪表电器有限公司 | Compound oil level sensor |
| CN104406657A (en) * | 2014-12-12 | 2015-03-11 | 天津市诺华自控技术有限公司 | Anti-hitting probing rod of level switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG LIANDA METER CO., LTD. Free format text: FORMER NAME OR ADDRESS: INTELLIGENT INSTRUMENT CO., LTD., RUIAN CITY |
|
| CP03 | Change of name, title or address |
Address after: No. 131 middle Lian Road, Ting Tian Town, Zhejiang City, Ruian Province, China: 325206 Patentee after: Zhejiang General Assembly Instrument Co Ltd Address before: Yu Jianpeng, No. 5 middle Lian Road, Ting Tian Town, Zhejiang City, Ruian Province, China: 325206 Patentee before: Ruian Intelligent Meters Co., Ltd. |
|
| 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 |