Installation structure of temperature sensing element for boiler heating surface metal wall

Abstract

This application relates to the field of instrument measurement and installation technology, specifically to an installation structure for a temperature measuring element of the metal wall of a boiler heating surface. It includes a temperature mounting base, one end of which is fixed to the outer wall of the boiler heating surface pipe, and an axially penetrating first mounting hole inside the temperature mounting base; a movable clamping bolt assembly, fixed to the other end of the temperature mounting base, and having an axially penetrating second mounting hole inside, the first and second mounting holes being coaxial; and a temperature measuring element, inserted into the mounting hole of the movable clamping bolt assembly and the temperature mounting base, with the measuring end of the temperature measuring element abutting against the outer wall of the heating surface pipe, and the temperature measuring element being pressed and fixed by the movable clamping bolt assembly. This reduces the workload and material waste during temperature measuring element replacement and calibration, thus lowering maintenance costs.

Description

Technical Field

[0001] This application relates to the field of instrument measurement and installation technology, specifically to an installation structure for a temperature measuring element of the metal wall of a boiler heating surface. Background Technology

[0002] In power plant boiler operation, it is necessary to monitor the temperature of numerous heating surface metal walls in real time to assess the heating status and guide combustion adjustments, preventing boiler shutdowns and economic losses due to pipe overheating and rupture. Large coal-fired boilers have numerous temperature measurement points on their heating surface metal walls, sometimes reaching thousands. The installation method directly impacts the workload and ease of operation and maintenance. Conventional techniques typically involve welding an arc-shaped metal heat collector block to the outer wall of the heating surface pipes, inserting a sheathed thermocouple temperature sensing element into the inner hole of the heat collector block, and then tightening it with screws through pre-drilled holes in the block to secure the sensing element. After installation, an external insulation layer is laid on the boiler's heating surface pipes, with the metal heat collector block and screws all inside the insulation layer. However, this traditional installation method has its drawbacks: since the screws and heat collector block are located inside the pipe insulation layer, prolonged exposure to heat can cause the screws and heat collector block to deform and seize, making normal disassembly impossible. If the temperature sensing element needs to be replaced or calibrated during unit maintenance, and the screws cannot be loosened, the entire collector block must be cut off from the pipe wall. However, the collector block is usually fixed to the outer wall of the pipe by spot welding at the four corners; cutting it off may damage the pipe. According to regulations, the boiler must then undergo a hydrostatic test again, which is highly impractical in actual operation. Even if the screws can be loosened, since all fasteners are embedded in the insulation layer, each maintenance requires extensive removal of the insulation material. After removing the temperature sensing element for calibration or replacement, the insulation must be restored, resulting in a huge workload and significant waste of insulation material.

[0003] Therefore, the installation structure of the traditional boiler heating surface metal wall temperature measuring element brings many difficulties to the maintenance of boiler heating surface wall temperature monitoring, and urgently needs to be improved. Utility Model Content

[0004] In view of this, the embodiments of this application provide an installation structure for a temperature measuring element of the metal wall of a boiler heating surface, which effectively solves the problem of difficult maintenance of traditional boiler heating surface wall temperature measuring points.

[0005] The first aspect of this application provides an installation structure for a temperature measuring element of the metal wall of a boiler heating surface, comprising: A temperature mounting base is fixed at one end to the outer wall of the heating surface pipe of the boiler, and the temperature mounting base has an axially penetrating first mounting hole inside. The movable ferrule bolt assembly is fixed to the other end of the temperature mounting base, and has an axially penetrating second mounting hole inside, with the first mounting hole and the second mounting hole being coaxial. The temperature sensing element is inserted into the mounting hole of the movable ferrule bolt assembly and the temperature mounting base. The measuring end of the temperature sensing element abuts against the outer wall of the heated surface pipe. The temperature sensing element can be pressed and fixed by the movable ferrule bolt assembly.

[0006] In one embodiment, the end face of the other end of the temperature mounting base protrudes from the surface of the insulation layer of the heated surface pipe.

[0007] In one embodiment, the movable ferrule bolt assembly includes: The lower bolt assembly is provided with a second mounting hole, one end of which is threadedly connected to the other end of the temperature mounting base; A retainer is provided at the other end of the lower bolt assembly; The upper nut is used to engage with the threaded end of the lower bolt assembly and can apply a radial force to the ferrule when tightened, causing the ferrule to tighten inward to clamp the temperature sensing element.

[0008] In one embodiment, the ferrule has a clamping end that is embedded in the second mounting hole and used to clamp the temperature measuring element, and a force-receiving end located outside the second mounting hole, which, under the radial force applied by the upper nut, causes the clamping end to form a clamping engagement with the temperature measuring element.

[0009] In one embodiment, one end of the temperature mounting base is fixed to the outer wall of the heated surface pipe by welding.

[0010] In one embodiment, the central axes of the first mounting hole and the second mounting hole are perpendicular to the outer wall of the heated surface pipe.

[0011] In one embodiment, the temperature sensing element is an armored thermocouple wire, which is a flexible, bendable structure.

[0012] The installation structure of the boiler heating surface metal wall temperature measuring element according to this application embodiment includes: a temperature mounting base, one end of which is fixed to the outer wall of the boiler heating surface pipe, and the temperature mounting base has an axially penetrating first mounting hole inside; a movable clamping bolt assembly, fixed to the other end of the temperature mounting base, and having an axially penetrating second mounting hole inside, the first mounting hole and the second mounting hole being coaxial; and a temperature measuring element, inserted into the mounting hole of the movable clamping bolt assembly and the temperature mounting base, the measuring end of the temperature measuring element abutting against the outer wall of the heating surface pipe, and the temperature measuring element being pressed and fixed by the movable clamping bolt assembly. By changing the fixing structure of the temperature measuring element from the traditional fixed installation of a metal heat collector block and built-in screws to the installation of an external movable clamping bolt assembly, the temperature measuring element can be directly calibrated or replaced by loosening and tightening the movable clamping bolt assembly structure. Therefore, when replacing or calibrating the temperature measuring element, it is not necessary to disassemble the insulation layer, and there is no problem of fastener jamming due to high temperature deformation, which greatly simplifies the maintenance operation process. This reduces the workload and material waste associated with replacing and calibrating temperature sensing elements, thereby lowering maintenance costs. Each maintenance check saves significant manpower and insulation material costs, significantly improving the reliability and economy of boiler heating surface wall temperature monitoring. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of this application. Detailed Implementation

[0015] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0016] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0017] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0019] like Figure 1 As shown in the embodiment of this application, an installation structure for a boiler heating surface metal wall temperature measuring element includes: Temperature mounting base 1, one end of which is fixed to the outer wall of the heating surface pipe 2 of the boiler, and the temperature mounting base 1 has an axially penetrating first mounting hole inside. The movable ferrule bolt assembly 4 is fixed to the other end of the temperature mounting base 1, and has an axially penetrating second mounting hole inside. The first mounting hole and the second mounting hole are coaxial. Temperature sensing element 3 is inserted into the mounting hole of movable ferrule bolt assembly 4 and temperature mounting base 1. The measuring end of temperature sensing element 3 abuts against the outer wall of heated surface pipe 2. Temperature sensing element 3 can be pressed and fixed by movable ferrule bolt assembly 4.

[0020] In one embodiment, the end face of the other end of the temperature mounting base 1 protrudes from the surface of the insulation layer of the heated surface pipe 2.

[0021] In one embodiment, the movable ferrule bolt assembly 4 includes: The lower bolt assembly 6 is provided with a second mounting hole, one end of which is threaded to the other end of the temperature mounting base 1; A retainer is provided at the other end of the lower bolt assembly 6; The upper nut 5 is used to engage with the threaded end of the lower bolt assembly 6, and can apply radial force to the ferrule when tightened, so that the ferrule is tightened inward to clamp the temperature sensing element 3.

[0022] In one embodiment, the ferrule has a clamping end that is embedded in the second mounting hole and used to clamp the temperature measuring element 3, and a force-receiving end located outside the second mounting hole that, under the radial force applied by the upper nut 5, causes the clamping end to form a clamping engagement with the temperature measuring element 3.

[0023] In applications, the ferrule can be an elastic structural component, such as a C-type washer, which can reduce its inner diameter under radial force to achieve the clamping function.

[0024] In one embodiment, one end of the temperature mounting base 1 is fixed to the outer wall of the heated surface pipe 2 by welding.

[0025] In one embodiment, the central axis of the first mounting hole and the second mounting hole is perpendicular to the outer wall of the heated surface pipe 2.

[0026] In one embodiment, the temperature sensing element 3 is an armored thermocouple wire, which is a flexible, bendable structure.

[0027] In application, the temperature mounting base 1 is a short cylindrical tube, wider at the top and narrower at the bottom, with its bottom welded and fixed to the outer wall of the boiler heating surface pipe 2 (either full-circumferential welding or intermittent spot welding can be used to ensure the mounting base is firm and does not loosen). The temperature mounting base 1 has an axially penetrating mounting hole inside, the bottom of which directly contacts the outer wall of the heating surface pipe 2. The temperature sensing element is an armored thermocouple, with its measuring end (lower end) inserted into the mounting hole from the top of the temperature mounting base 1, extending to the bottom and abutting against the outer wall of the heating surface pipe 2. The inner hole at the top of the mounting base 1 is machined with internal threads for connecting the movable ferrule bolt assembly 4. The movable ferrule bolt assembly 4 includes an upper nut 5 and a lower bolt assembly 6. The lower bolt assembly 6 is a metal structure with external threads on both the top and bottom, and the external threads of the lower bolt assembly mate with the internal threads at the top of the mounting base 1. The upper nut 5 is movable, with internal threads, and is fitted onto the upper part of the lower bolt assembly. A ferrule (not shown in the figure, such as a C-type or O-type ferrule) is provided between the upper nut and the lower bolt assembly. The thermocouple wire passes through the center hole of the movable ferrule bolt assembly. First, the lower bolt assembly is assembled, and the lower external thread of the lower bolt assembly is screwed into the mounting base. Then, the ferrule is fitted onto the upper part of the lower bolt assembly. When the upper nut 5 is screwed into the upper external thread of the lower bolt assembly 6, the ferrule is compressed, tightly clamping the thermocouple and ensuring that the measuring end of the thermocouple wire is pressed firmly against the outer wall of the heated surface pipe 2. In this way, the thermocouple wire can promptly and accurately sense the actual temperature of the heated metal wall and transmit the temperature signal to the DCS control system for monitoring and alarm purposes.

[0028] In this embodiment, the height of the temperature mounting base 1 is determined based on the thickness of the insulation layer of the boiler's heating surface pipe. It should be slightly greater than the sum of the insulation layer thickness and the thickness of the upper nut of the movable bolt assembly 4, to ensure that the upper nut of the movable ferrule bolt assembly 4 is completely exposed outside the insulation layer. For example, for a heating surface pipe with an outer diameter of approximately 50mm, the insulation layer thickness is typically about 20mm, and the nut thickness is about 10mm. Therefore, a mounting base height of approximately 40mm is sufficient. The advantage of this design is that during normal boiler operation, the lower part of the temperature mounting base 1 and the heating surface pipe 2 are encased in the insulation layer, while the upper nut of the movable ferrule bolt assembly 4 is exposed outside the insulation layer, facilitating operation. When it is necessary to replace the temperature sensing element or calibrate the thermocouple, maintenance personnel only need to loosen the upper nut of the movable ferrule bolt outside the insulation layer to pull the thermocouple wire from the temperature mounting base, without having to remove a large area of ​​insulation material or even cut the mounting base as in traditional methods. Since the movable ferrule bolt assembly is kept at room temperature, there is no risk of high-temperature deformation or jamming, making the maintenance process safe and smooth. After replacement or calibration, insert the new or calibrated armored thermocouple wire into the mounting base and retighten the nut of the movable ferrule bolt to secure it. The entire process is simple and quick.

[0029] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An installation structure for a temperature measuring element of the metal wall of a boiler heating surface, characterized in that, include: Temperature mounting base (1), one end of which is fixed to the outer wall of the heating surface pipe (2) of the boiler, and the temperature mounting base (1) has an axially penetrating first mounting hole inside; The movable ferrule bolt assembly (4) is fixed to the other end of the temperature mounting base (1), and has an axially penetrating second mounting hole inside. The first mounting hole and the second mounting hole are coaxial. The temperature measuring element (3) is inserted into the mounting hole of the movable ferrule bolt assembly (4) and the temperature mounting base (1). The measuring end of the temperature measuring element (3) abuts against the outer wall of the heated surface pipe (2). The temperature measuring element (3) can be pressed and fixed by the movable ferrule bolt assembly (4).

2. The installation structure of the boiler heating surface metal wall temperature measuring element according to claim 1, wherein The end face of the other end of the temperature mounting base (1) protrudes from the surface of the insulation layer of the heated surface pipe (2).

3. The installation structure of the boiler heating surface metal wall temperature measuring element according to claim 1, wherein The movable ferrule bolt assembly (4) includes: The lower bolt assembly (6) is provided with a second mounting hole, one end of which is threaded to the other end of the temperature mounting seat (1); A retainer is provided at the other end of the lower bolt assembly (6); The upper nut (5) is used to engage with the other end of the lower bolt assembly (6) and can apply radial force to the ferrule in the tightened state to tighten the ferrule inward to clamp the temperature measuring element (3).

4. The installation structure of the boiler heating surface metal wall temperature measuring element as described in claim 3, characterized in that, The ferrule has a clamping end that is embedded in the second mounting hole and used to clamp the temperature measuring element (3), and a force-receiving end located outside the second mounting hole, which, under the radial force applied by the upper nut (5), causes the clamping end to form a clamping fit with the temperature measuring element (3).

5. The installation structure of the boiler heating surface metal wall temperature measuring element according to claim 1, wherein One end of the temperature mounting base (1) is fixed to the outer wall of the heated surface pipe (2) by welding.

6. The installation structure of the boiler heating surface metal wall temperature measuring element according to claim 1, wherein The central axes of the first mounting hole and the second mounting hole are perpendicular to the outer wall of the heated surface pipe (2).

7. The installation structure of the boiler heating surface metal wall temperature measuring element according to claim 1, wherein The temperature measuring element (3) is an armored thermocouple wire, which is a flexible structure that can be bent.

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