CN205300795U - Whole wear -resisting COT thermocouple - Google Patents

Abstract

The utility model relates to a whole wear -resisting COT thermocouple, including whole wear -resisting head, little sleeve pipe, stand pipe, thermocouple core, outer tube and flange, whole wear -resisting head becomes integrative with little sleeve pipe, and leaves the gap between whole wear -resisting head and the little sleeve pipe, and the relative outer tube eccentric settings of little sleeve pipe is and be located wholly wear -resisting first back, and the point for measuring temperature of thermocouple core is located little sheathed tube tip, with the clearance of little sleeve pipe terminal surface <= 0.2 millimeter. The utility model discloses a wear -resisting head and little sleeve pipe adopt whole shaping mode, long service life, the difficult leakage, the flange has had more four screw holes than standard specification, and when the coking, when flange and outer tube can not be extracted easily, four screw holes addding on the available flange withstood flange of the equipment with four pieces of bolt tightening, just enable the outer tube and extract easily, wear -resisting top of the head portion is the prism structure, the wear -resisting carbide of wear -resisting first prism face build -up welding, and the prism face becomes the parallel direction with the medium flow direction basically, and reducible medium improves wear -resisting first life to the wearing and tearing of wear -resisting head.

Description

Overall wear-resisting COT thermocouple

Technical field

This utility model relates to a kind of thermocouple, and especially one is used for measuring the thermocouple of cracking of ethylene heater outlet temperature (COT).

Background technology

The temperature accuracy of cracking of ethylene heater outlet temperature (COT), directly influences the important indicators such as the quality of pyrolysis furnace operation, yield of ethene, production capacity and energy consumption, and therefore the temperature of COT controls most important.

On-the-spot operating mode, during production run, pyrolysis furnace outlet temperature is about 850 DEG C, having liquid and solid particle in medium, corrosivity coking strong, easy, flow velocity are fast, the thermocouple therefore used should have the feature that be quick on the draw, high temperature resistant, corrosion-resistant, wear-resistant, quick detachable.

Such as number of patent application: the taper COT thermocouple of 201020049691.1 mainly includes wear-resisting head, small casing, thermocouple core, trocar sheath and flange, wear-resisting head and small casing adopt welding manner to fix, owing to gap is less herein, weld seam is typically small, when, after life-time service, commissure occurs crack and causes the risk of leakage.

Summary of the invention

Technical problem to be solved in the utility model is to provide the cracking furnace COT thermocouple of a kind of long service life, with the problem overcoming existing cracking of ethylene heater outlet temperature (COT) to use thermocouple wear-resisting head part to have risk of leakage.

For solving above-mentioned technical problem, the technical solution of the utility model is: a kind of overall wear-resisting COT thermocouple, including overall wear-resisting head, small casing, guide pipe, thermocouple core, trocar sheath and flange, described overall wear-resisting head is integral with small casing, and leave gap between entirety wear-resisting head and small casing, the relative trocar sheath eccentric setting of small casing and be positioned at overall wear-resisting head back, the point for measuring temperature of described thermocouple core is positioned at the end of small casing, with gap��0.2 millimeter of small casing end face.

Described flange has additional four screws. Described overall wear-resisting head is positioned at trocar sheath one side position, and overall wear-resisting head top is prismatic structure, and its prismatic surface build-up welding wearable hard alloy, prismatic face flows to substantially parallel with medium.Described thermocouple core inserts small casing by guide pipe, filling ceramic fibre between guide pipe and trocar sheath.

The beneficial effects of the utility model are:

1, wear-resisting head and small casing adopt global formation mode, long service life, not easily leak;

2, flange than standard specifications many four screwed holes, when coking, when flange and trocar sheath can not be extracted easily, four screwed holes that available flange is set up, tighten with four pieces of bolts and withstand vessel flange, trocar sheath just can be made to extract easily;

3, wear-resisting head top is prismatic structure, wear-resisting head prismatic surface build-up welding wearable hard alloy, and prismatic face and medium flow to and substantially become parallel direction, can reduce the medium abrasion to wear-resisting head, improves wear-resisting head service life;

4, small casing stretches out trocar sheath, relative trocar sheath eccentric setting and be positioned at wear-resisting head back, the point for measuring temperature of described thermocouple core is positioned at the end of small casing, with the gap of small casing end face less than or equal to 0.2 millimeter, thermocouple response speed and certainty of measurement can be improved, can be unlikely to again to be washed into by medium, cause damaging;

5, filling ceramic fibre between guide pipe and trocar sheath, it is possible to improve the heat-insulating property of thermocouple.

Accompanying drawing explanation

Fig. 1 is the overall structure schematic diagram of the embodiment of the wear-resisting COT thermocouple of entirety of the present utility model;

Fig. 2 is along A A sectional view in Fig. 1;

Fig. 3 is the B direction view of Fig. 1;

Fig. 4 is the 3-D view of wear-resisting head;

Fig. 5 is the wear-resisting COT the installation of TC figure of entirety of the present utility model.

Detailed description of the invention

Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail.

As shown in Figures 1 to 5, a kind of overall wear-resisting COT thermocouple, including overall wear-resisting head 1, thermocouple core 2, ceramic fibre 3, guide pipe 4, trocar sheath 5, flange 6, flange-interface 7, lower pipe joint 8, loose joint 9, upper pipe joint 10, rosette 11, small casing 12.

Overall wear-resisting head 1 and small casing 12 part are overall bar, one-body molded by the processing of chip processing mode, leave gap, medium can be extended there through between overall wear-resisting head 1 and small casing 12; Relative trocar sheath 5 eccentric setting of small casing 12 and be positioned at overall wear-resisting head 1 back, the point for measuring temperature of thermocouple core 2 is positioned at the end of small casing 12, with the gap of small casing 12 end face less than or equal to 0.2 millimeter.

Flange 6 has additional four screws. When not extracting easily due to coking, flange 6 and sleeve pipe, four screwed holes that available flange 6 is set up, tighten with four pieces of bolts and withstand vessel flange 6, sleeve pipe just can be made to extract. Overall wear-resisting head 1 is positioned at trocar sheath 5 one side position, and overall wear-resisting head 1 top is prismatic structure, and its prismatic surface build-up welding wearable hard alloy, prismatic face flows to substantially parallel with medium. Thermocouple core 2 inserts small casing 12 by guide pipe 4,5 filling ceramic fibre 3 between guide pipe 4 and trocar sheath.

Claims (4)

1. the wear-resisting COT thermocouple of entirety, including overall wear-resisting head (1), small casing (12), guide pipe (4), thermocouple core (2), trocar sheath (5), flange (6), it is characterized in that: described overall wear-resisting head (1) is integral with small casing (12), and leave gap between entirety wear-resisting head (1) and small casing (12), small casing (12) relatively trocar sheath (5) eccentric setting and be positioned at overall wear-resisting head (1) back, the point for measuring temperature of described thermocouple core (2) is positioned at the end of small casing (12), gap��0.2 millimeter with small casing (12) end face.

2. the wear-resisting COT thermocouple of entirety according to claim 1, it is characterised in that: described flange (6) has additional four screws.

3. the wear-resisting COT thermocouple of entirety according to claim 1, it is characterized in that: described overall wear-resisting head (1) is positioned at trocar sheath one side position, overall wear-resisting head (1) top is prismatic structure, its prismatic surface build-up welding wearable hard alloy, prismatic face flows to substantially parallel with medium.

4. the wear-resisting COT thermocouple of entirety according to claim 1, it is characterized in that: described thermocouple core (2) inserts small casing (12), filling ceramic fibre (3) between guide pipe (4) and trocar sheath (5) by lead (4).