CN217483697U - Thread type COT thermocouple - Google Patents

Abstract

The utility model provides a screw thread formula COT thermocouple, including interior protective case, arrange interior protective case intraductal armor thermocouple core in, wear-resisting head, outer protective case, sealed clamping ring, movable screw, go up the protection tube, the terminal box is connected with last protection tube upper end, wear-resisting overhead portion is prismatic structure, it personally submits the ladder conical surface with equipment connection, wear-resisting head rear side welding has interior protection tube sleeve pipe, and constitute the thermometer sleeve pipe as an organic whole with outer protective case connection and whole welding, sealed clamping ring and movable screw are put into in proper order to outer protective case department from bottom to top, it is fixed with the thermometer sleeve pipe to go up the protection tube lower extreme, the terminal box passes through armor thermocouple core through connection with the thermometer sleeve pipe. The utility model relates to a screw thread type thermocouple that can be used to measure ethylene cracking furnace exit temperature (COT) and adopt screwed connection.

Description

Thread type COT thermocouple

Technical Field

The utility model relates to a thermocouple, especially a can be used to measure ethylene cracking furnace exit temperature (COT) and adopt screwed connection's screw thread formula thermocouple.

Background

The COT thermocouple is an important instrument of an ethylene device, and according to the process requirements, the product requires high precision, the service life of the product is more than or equal to 4 years, and the product can be conveniently disassembled.

The temperature accuracy of the outlet temperature (COT) of the ethylene cracking furnace directly influences important indexes such as the operation quality, the ethylene yield, the productivity, the energy consumption and the like of the cracking furnace, so that the temperature control of the COT is very important.

Under the working conditions of site, the outlet temperature of the cracking furnace is about 850 ℃ during production and operation, liquid and solid particles exist in a medium, the medium has strong corrosivity, easy coking and high flow speed, and therefore, the used thermocouple has the following characteristics: sensitive reaction, high temperature resistance, corrosion resistance, wear resistance and easy disassembly.

Most of the current flange connections used in thermocouples for ethylene cracking furnace exit temperature (COT) are as described in patent application nos.: the patents ZL201620042001.7, ZL201920896087.3 and the like all adopt flange connection, but domestic a small amount of ethylene cracking furnace devices also exist and use trapezoidal threads as a fixing mode, the installation inner hole is small, the inclined plane is adopted for pressing and sealing, the thermometer sleeve pipe uses a conical integral drilling sleeve pipe, generally, hard alloy is overlaid or sprayed on the outer layer of the sleeve pipe to serve as a wear-resistant layer, but the contact area of the conical structure and a medium is too large when the conical structure is washed by solid particles, the wear-resistant layer is easily worn and exhausted, and the service life is not long.

SUMMERY OF THE UTILITY MODEL

In order to solve the prior technical problem, the utility model provides a screw thread formula COT thermocouple can be used for ethylene cracking furnace exit temperature (COT), and its wear-resisting head structure can reduce wearing and tearing, improves the sheathed tube life of thermometer.

The technical scheme of the utility model as follows:

the threaded COT thermocouple comprises an armored thermocouple core, an inner protective sleeve, a wear-resistant head, an outer protective sleeve, a sealing pressing ring, a movable screw, an upper protective tube and a junction box, wherein the armored thermocouple core is arranged inside the inner protective sleeve, the junction box is connected with the upper end of the upper protective tube, the top of the wear-resistant head is of a prismatic structure, the wear-resistant head is connected with equipment to form a stepped conical surface, the wear-resistant head is welded and fixed with the inner protective sleeve and then connected with the outer protective sleeve into a whole to form a thermometer sleeve, the outer protective sleeve is sequentially provided with the sealing pressing ring and the movable screw from bottom to top, the lower end of the upper protective tube is fixed with the thermometer sleeve, and the junction box is in penetrating connection with the thermometer sleeve through the armored thermocouple core.

Furthermore, the top prism surface of the wear-resistant head is welded with the wear-resistant hard alloy in a surfacing mode, and the prism surface is basically parallel to the flow direction of the medium.

Further, the inner protective sleeve is fixed to the rear side of the wear-resistant head.

Furthermore, the wear-resistant head and the inner protective sleeve are welded and fixed and then are fixed with the outer protective sleeve in a screw connection mode and are welded into a whole to form the thermometer sleeve.

Further, the junction box is connected with the upper end of the upper protection pipe through threads.

Advantageous effects

The utility model discloses a wear-resisting first top in the thermo well pipe sets up to prismatic structure, and the prism face becomes the parallel direction basically with the medium flow direction, compares the conical surface of wear-resisting first of well pipe in the prior art, can effectual change fluid form, alleviates the degree of erosion and wear of solid particle to wear-resisting head; meanwhile, the conical sealing surface of the wear-resistant head is in a stepped shape, when the wear-resistant head is installed, the conical surface of a product is in multi-layer contact with the conical surface of equipment, the sealing performance is better after the product is compressed, and in the process of replacing a new thermometer, a small number of conical surfaces in multi-layer contact can enable the thermometer sleeve to be pulled out more easily; in addition, interior protective case independent setting is in wear-resisting head rear side, and the temperature measurement point of armoured thermocouple core is located the top of inner protection pipe, with interior protective case top surface laminating, the thinner thick wall of interior protective case and with the characteristics of the inseparable laminating of armoured thermocouple, can greatly provide the thermal response time and the measurement accuracy of thermocouple, the design behind the off-centre can make inner protection pipe can not receive the washing away of medium again and lead to damaging.

Drawings

Fig. 1 is a schematic structural view of a threaded COT thermocouple according to the present invention;

FIG. 2 is a schematic view of the direction A in FIG. 1;

fig. 3 is a schematic view of the on-site installation of a threaded COT thermocouple according to the present invention;

fig. 4 is an enlarged schematic view of B in fig. 3.

In the figure

1. An armored thermocouple core; 2. an inner protective sleeve; 3. a wear-resistant head; 4. an outer protective sleeve; 5. sealing the pressing ring; 6. a movable screw; 7. an upper protection tube; 8. a junction box.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected or indirectly connected to the other element. It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention, and are not intended to indicate that a device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

The utility model provides a screw thread formula COT thermocouple, as shown in fig. 1 ~ 4, include: the thermocouple comprises an inner protective sleeve 2, an armored thermocouple core 1 arranged in the inner protective sleeve 2, a wear-resistant head 3, an outer protective sleeve 4, a sealing pressing ring 5, a movable screw 6, an upper protective tube 7 and a junction box 8; the terminal box 8 with 7 upper ends of upper protection pipe are connected, and 3 tops of wear-resisting head are prismatic structure, and it personally submits the ladder conical surface with equipment connection, and wear-resisting head 3 rear side welded has interior protection pipe sleeve pipe 2 to be connected and wholly weld as an organic whole with outer protective case 4 and constitute thermometer sleeve pipe, and sealed clamping ring 5 and movable screw 6 are put into in proper order from bottom to top to outer protective case 4 department, and 7 lower extremes of upper protection pipe are fixed with the thermometer sleeve pipe, and terminal box 8 passes through connection through armor thermocouple core 1 with the thermometer sleeve pipe.

In an embodiment of the threaded COT thermocouple provided in the present invention, the wear-resistant hard alloy is deposited on the top prism surface of the wear-resistant head 3, and the prism surface is substantially parallel to the medium flow direction.

In an embodiment of the threaded COT thermocouple, the wear-resistant head 3 is fixed to the inner protective sleeve 2 by screws and welded to the outer protective sleeve 4 to form a thermo-well tube.

In an embodiment of the threaded COT thermocouple provided in the present invention, the terminal box 8 is connected to the upper end of the upper protection tube 7 by a thread.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A threaded COT thermocouple comprises an armored thermocouple core (1), an inner protective sleeve (2), a wear-resistant head (3), an outer protective sleeve (4), a sealing pressing ring (5), a movable screw (6), an upper protective tube (7) and a junction box (8), wherein the armored thermocouple core (1) is arranged inside the inner protective sleeve (2), the junction box (8) is connected with the upper end of the upper protective tube (7), the threaded COT thermocouple is characterized in that the top of the wear-resistant head (3) is of a prismatic structure and is connected with equipment to form a stepped conical surface, the wear-resistant head (3) and the inner protective sleeve (2) are connected with the outer protective sleeve (4) after being welded and fixed, the outer protective sleeve (4) is provided with the sealing pressing ring (5) and the movable screw (6) in sequence from bottom to top, the lower end of the upper protective tube (7) is fixed with the thermometer sleeve, the junction box (8) is connected with the thermometer sleeve in a penetrating way through the armored thermocouple core (1).

2. Threaded COT thermocouple according to claim 1, characterised in that the wear resistant head (3) has a wear resistant cemented carbide with a top prismatic surface, which is essentially parallel to the medium flow direction.

3. Threaded COT thermocouple according to claim 2, characterized in that the inner protective sleeve (2) is fixed to the rear side of the wear-resistant head (3).

4. The threaded COT thermocouple according to claim 3, wherein the wear-resistant head (3) is fixed to the inner protective sleeve (2) by welding and then fixed to the outer protective sleeve (4) by screwing to form a thermo-well tube.

5. The threaded COT thermocouple according to claim 4, characterized in that the terminal box (8) is screwed to the upper end of the upper protection tube (7).

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