CN216053986U

CN216053986U - Temperature measuring cable device for geothermal monitoring

Info

Publication number: CN216053986U
Application number: CN202121008036.6U
Authority: CN
Inventors: 文兰; 宋海洋; 肖世强
Original assignee: Langfang Zhaosui Temperature Measurement Cable Co ltd
Current assignee: Langfang Zhaosui Temperature Measurement Cable Co ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2022-03-15
Anticipated expiration: 2031-05-12

Abstract

The utility model provides a temperature measurement cable device for geothermol power monitoring includes bus temperature measurement cable subassembly, PE sleeve pipe and geothermol power monitoring well, PE sleeve pipe internally mounted bus temperature measurement cable subassembly, and will the PE sleeve pipe install geothermol power monitoring well in, this utility model device has the advantage that the technique is reliable, simple structure and easy maintenance.

Description

Temperature measuring cable device for geothermal monitoring

Technical Field

The utility model relates to the field of temperature monitoring devices, in particular to a temperature measuring cable device for geothermal monitoring.

Background

During the development and utilization of geothermal energy, the underground rock-soil temperature needs to be monitored in an entrance way, the adopted geothermal monitoring temperature measuring cable supplies power for a long time, a single-bus temperature measuring chip is arranged, the requirement on the waterproof performance of the geothermal monitoring temperature measuring cable is strict, meanwhile, the geothermal monitoring temperature measuring cable is installed underground through a small-caliber drilling hole, and a single cable is long and needs to have certain tensile strength and wear resistance.

A temperature measuring cable (application number or patent number 201720131353.4) of a ground temperature detecting system adopts a mode that the temperature measuring cable comprises a cable conductor and a sensor component, the sensor component comprises a shell device, interfaces are arranged at two ends of the cable conductor, joints for connecting the cable conductor are arranged at two ends of the shell, and a connecting component is arranged between the cable conductor and the sensor component, the temperature measuring cable disclosed by the utility model has the following defects that: the mounting tightness of the sealing device of the connecting assembly cannot be verified during mounting; the temperature measuring cable is not formed in one step, the tensile capacity borne by the temperature measuring cable is low, the connecting assembly is easy to loosen after being subjected to external force, and the waterproof performance of the cable is not easy to guarantee; the rigid connecting component and the flexible cable are easy to have more serious friction with the hole wall in the installation process, so that the temperature measuring cable is easy to be pulled off; no sleeve is provided, and the maintenance cannot be carried out in the use process.

A cable for geological survey of coal field and geothermal logging (application or patent No. 201720131353.4) is composed of power cable core, video cable core, and data transmission cable core, which are distributed in the tear-resistant silicon rubber carrier layer, steel cable in the center of said tear-resistant silicon rubber carrier layer, nano-class semi-conducting diamond-like carbon film shielding aluminium alloy layer, low-smoke halogen-free polyolefine inner sheath layer, anticorrosion layer made of high-molecular material for resisting acid, alkali and oil, water-proof canvas tape wrapping water-proof layer, low-smoke halogen-free polyolefine outer sheath layer, asphalt anticorrosion layer, and fluorescent marker tape, meanwhile, the problems of complex structure and higher manufacturing cost exist.

In view of the above circumstances, there is an urgent need for a temperature measuring cable device for geothermal monitoring that is technically reliable, simple in structure and easy to maintain.

SUMMERY OF THE UTILITY MODEL

A temperature measurement cable assembly technical scheme for geothermol power monitoring: the intelligent geothermal monitoring system comprises a bus temperature measuring cable assembly, a PE sleeve and a geothermal monitoring well, wherein the bus temperature measuring cable assembly is installed inside the PE sleeve, and the PE sleeve is installed in the geothermal monitoring well.

Furthermore, the bus temperature measuring cable assembly comprises a plurality of digital temperature sensors, a bus cable, a tensile steel wire and a PE sheath layer, wherein the bus cable is connected with the digital temperature sensors in series and is wrapped in the PE sheath layer together with the tensile steel wire.

Furthermore, the PE casing comprises a PE casing ground lower end and a PE casing ground upper end, the PE casing ground lower end is installed to the bottom of the geothermal monitoring well, and the PE casing ground upper end is installed to a certain height outside the wellhead of the geothermal monitoring well.

Furthermore, the bus temperature measuring cable assembly extends outwards for a certain length from the ground end of the PE sleeve and is used for being connected with a temperature measuring instrument outwards.

Furthermore, the underground end of the PE sleeve is sealed by adopting a PE plug for hot melting, and a gap between the inner side of the pipe wall of the upper end of the PE sleeve and the bus cable is sealed by adopting a sealant.

Furthermore, liquid grease is filled in a gap between the inner side of the wall of the PE casing pipe and the bus temperature measuring cable assembly, and a gap between the outer side of the wall of the PE casing pipe and the wall of the geothermal monitoring well is filled with a backfill material.

The installation method of the device comprises the following steps: firstly, the bus temperature measuring cable assembly completes assembly work in a factory; secondly, finishing the work of installing the bus temperature measuring cable assembly in the PE sleeve; thirdly, hot melting and plugging the underground end of the PE sleeve by a PE plug; fourthly, installing the PE sleeve in a geothermal monitoring well; fifthly, filling a gap between the outer side of the wall of the PE casing pipe and the wall of the geothermal monitoring well by adopting a backfill material; a sixth part, filling liquid grease into the gap between the inner side of the PE sleeve pipe wall and the bus temperature measuring cable assembly; and seventhly, sealing gaps between the inner sides of the pipe walls of the upper ends of the PE sleeves and the bus cables by adopting sealant.

The device of the utility model has the advantages that: the PE sleeve and the PE sheath layer are used for double-layer waterproofing, so that the device has excellent waterproofing performance; the built-in tensile steel wire enables the device to bear certain tensile capacity; the PE sleeve can be bent to a certain degree, the surface is smooth, and friction damage can be effectively avoided; the device has simple structure, and the key bus temperature measuring cable component can be drawn out from the PE sleeve and replaced, thereby being beneficial to the maintenance of the device; the device has no special requirements on the PE sleeve, the PE sheath and the liquid grease, and has lower manufacturing cost.

Drawings

Fig. 1 is a schematic structural diagram of the novel invention.

Fig. 2 is a schematic cross-sectional view of the novel invention.

In fig. 1: 1-bus temperature measuring cable assembly; 11-a digital temperature sensor; 2-PE casing pipe; 21-PE plug; 22-sealing glue; and 3, geothermal monitoring wells.

In fig. 2: 12-tensile steel wire; 13-bus cable; 14-PE sheath layer, 21-liquid grease; 22-PE casing pipe wall, 31-backfill material and 32-geothermal monitoring well wall.

Detailed Description

In order to make the technical solutions and advantages of the present invention more clearly understood, the following further description is made with reference to the accompanying drawings and specific embodiments, it should be understood that the specific embodiments described herein are only for understanding the present invention and are not intended to limit the present invention, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

The technical scheme of the embodiment of the temperature measuring cable device for geothermal monitoring is as follows: the intelligent geothermal monitoring system comprises a bus temperature measuring cable assembly, a PE sleeve and a geothermal monitoring well, wherein the bus temperature measuring cable assembly is installed inside the PE sleeve, and the PE sleeve is installed in the geothermal monitoring well.

Furthermore, the length of the bus temperature measuring cable assembly is 105m, the length of the PE casing is 101m, the depth of the geothermal monitoring well is 100m, and the caliber of the geothermal monitoring well is 133 mm.

Furthermore, the bus temperature measuring cable assembly comprises 9 digital temperature sensors, a bus cable, a tensile steel wire and a PE sheath layer, wherein the bus cable is connected with the digital temperature sensors in series and is wrapped in the PE sheath layer together with the tensile steel wire.

Furthermore, the digital temperature sensor adopts a DS18B20 model digital temperature sensor, a stainless steel protective sleeve is sleeved, a self-contained data converter and a field bus manager are provided, and the digital temperature sensor has a unique identification ID, so that a plurality of digital temperature sensors of the model can be directly connected to one bus cable to convert temperature parameters at different positions into digital signals suitable for long-distance transmission.

Furthermore, the bus cable adopts 3 x 0.75mm shielding wires, has the length of 105m, and is connected with one digital temperature sensor in series every 10 meters by taking one end as a starting point (including the starting point).

Furthermore, the specification of the tensile steel wire is 14, and the length of the tensile steel wire is the same as that of the bus cable.

Furthermore, the pipe diameter of the PE casing pipe is De32 and comprises an underground end and an underground end, the underground end of the PE casing pipe is installed at the bottom of the geothermal monitoring well, and the underground end of the PE casing pipe is installed at a position 1m away from the ground outside the wellhead of the geothermal monitoring well.

Furthermore, the bus temperature measuring cable assembly extends outwards for 4m from the ground end of the PE sleeve and is used for being connected with a temperature measuring instrument.

The device of the utility model has the following beneficial effects: the PE sleeve and the PE sheath are adopted for double-layer waterproofing, so that the device has excellent waterproofing performance; the built-in tensile steel wire enables the device to bear certain tensile capacity; the PE sleeve can be bent to a certain degree, the surface is smooth, and friction damage can be effectively avoided; the device has simple structure, and the key part of the bus temperature measuring cable assembly can be drawn out from the PE sleeve and replaced, thereby being beneficial to the maintenance of the device; the device has no special requirements on the PE sleeve, the PE sheath and the liquid grease, and has lower manufacturing cost.

Claims

1. A temperature measurement cable assembly for geothermal monitoring, comprising: the intelligent geothermal monitoring system comprises a bus temperature measuring cable assembly, a PE sleeve and a geothermal monitoring well, wherein the bus temperature measuring cable assembly is installed inside the PE sleeve, and the PE sleeve is installed in the geothermal monitoring well.

2. The thermometric cable apparatus of claim 1, wherein: the bus temperature measuring cable assembly comprises a plurality of digital temperature sensors, a bus cable, a tensile steel wire and a PE sheath layer, wherein the bus cable is connected with the digital temperature sensors in series and is wrapped in the PE sheath layer together with the tensile steel wire.

3. The thermometric cable apparatus of claim 1, wherein: the PE casing pipe comprises a PE casing pipe underground end and a PE casing pipe ground upper end, the PE casing pipe underground end is installed to the bottom of the geothermal monitoring well, and the PE casing pipe ground upper end is installed to a certain height outside the wellhead of the geothermal monitoring well.

4. The thermometric cable apparatus of claim 1, wherein: the bus temperature measuring cable component extends outwards for a certain length from the upper end of the PE sleeve.

5. The thermometric cable apparatus of claim 2, wherein: the underground end of the PE sleeve is plugged by a PE plug in a hot melting mode, and a gap between the inner side of the pipe wall of the upper end of the PE sleeve and the bus cable is plugged by sealant.

6. The thermometric cable apparatus of claim 1, wherein: a gap between the inner side of the wall of the PE sleeve and the bus temperature measuring cable assembly is filled with liquid grease, and a gap between the outer side of the wall of the PE sleeve and the wall of the geothermal monitoring well is filled with a backfill material.