A two-dimensional temperature field measuring device for narrow space inside a heating rod

Abstract

The utility model provides a kind of two-dimensional temperature field measuring device for heating rod inner wall narrow space, comprising: solid stick, mounting block assembly, thermocouple, traction assembly, solid stick is inserted into heating rod shell, the upper end of solid stick protrudes from the top of heating rod shell, multiple mounting block assemblies are fixed on solid stick from top to bottom, thermocouple is multiple, and each group of thermocouple includes multiple thermocouple temperature measuring heads fixed on the same mounting block assembly in annular array distribution, thermocouple temperature measuring head is metal sheet, and each metal sheet is respectively connected with one thermocouple lead, and all thermocouple leads are led out from the top of heating rod shell and connected with terminal box, and traction assembly is connected with the upper end of solid stick.The measuring device of the utility model realizes the synchronous measurement of wall temperature in the axial and circumferential multiple points of heating rod shell.

Description

Technical Field

[0001] This utility model relates to the field of wall temperature measuring devices, specifically to a two-dimensional temperature field measuring device for a narrow space inside the inner wall of a heating rod. Background Technology

[0002] With the energy crisis worsening, finding alternative clean energy sources is imperative, and utilizing efficient and stable nuclear energy for power generation is one of the important directions people are choosing. Inherent safety is one of the important goals in nuclear reactor development, and higher requirements have been set after nuclear accidents. Accident safety analysis is an essential step in the reactor design and development process, and the predictive accuracy of the analytical programs used is crucial. The predictive accuracy of the analytical programs depends on the ability of their underlying models to describe relevant physical phenomena, while refined experimental data can provide strong support for the development and verification of the underlying models, thus playing a vital role in reactor design and safety analysis. Since the structure of the lattice rod bundle is geometrically similar to that of fuel assemblies, characteristic data is often obtained through rod bundle experiments for phenomenon analysis and model development. Among these, the heating rod wall temperature is a key physical parameter, crucial for obtaining fluid heat transfer capacity and establishing heat transfer models; therefore, precise and accurate measurement of the heating rod wall temperature is necessary.

[0003] Existing heating rod temperature measuring devices typically involve fixing multiple thermocouples to a solid rod inserted into the heating rod housing. During measurement, the solid rod is moved and withdrawn, positioning the thermocouple measuring ends at different preset positions along the axial direction of the heating rod housing, forming multiple axial measuring surfaces. Each measuring surface has multiple measuring points due to the presence of multiple thermocouples. In experimental operation, the bottom measuring surface of the heating rod is usually measured first, followed by the solid rod being gradually withdrawn to measure the measuring surfaces at the middle and upper parts of the heating rod. Due to the limited internal space of the heating tube and the limited number of thermocouples, this conventional heating rod temperature measuring device can typically only achieve axial multi-point measurements, and cannot simultaneously measure the wall temperature at multiple points along both the circumferential and axial directions. Therefore, existing devices of this type cannot adequately meet the requirements for refined measurements in rod bundle heat transfer experiments. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a two-dimensional temperature field measurement device for the narrow space inside the heating rod, which enables simultaneous measurement of the wall temperature at multiple points in the axial and circumferential directions of the heating rod shell.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This utility model provides a two-dimensional temperature field measurement device for a narrow space inside a heating rod, comprising: a solid rod, mounting block assemblies, thermocouples, and a traction assembly. The solid rod extends into the heating rod housing, with its upper end protruding from the top of the heating rod housing. Multiple mounting block assemblies are fixed to the solid rod from top to bottom. The thermocouples are in multiple groups, each group including multiple thermocouple temperature probes evenly distributed and fixed in a ring array on the same mounting block assembly. The thermocouple temperature probes are metal sheets, each metal sheet being connected to a thermocouple lead. All thermocouple leads are led out from the top of the heating rod housing and connected to a junction box. The traction assembly is connected to the upper end of the solid rod.

[0007] As a preferred technical solution, each mounting block assembly includes a fastener and a stainless steel block. The fastener is composed of two semi-ring structures joined together. The surface of the solid rod has a groove area for mounting the fastener. Horizontal bolt holes are opened on the semi-ring structures. A first bolt is installed in the horizontal bolt holes and connects the solid rod. The stainless steel block is composed of two stainless steel semi-rings joined together. The surface of the fastener has a groove area for mounting the stainless steel block. Bolt holes are opened on the stainless steel semi-rings and corresponding bolt holes are opened on the fastener. A second bolt is inserted into the bolt holes of the fastener and the stainless steel semi-rings and bolted together for fixation. A metal sheet is welded and fixed to the outer circumference of the stainless steel block.

[0008] As a preferred technical solution, the fixing component and the stainless steel block are respectively provided with lead channels for thermocouple leads to pass through. The lead channels of the fixing component are connected to the lead channels of the stainless steel block, and the outlet of the lead channel of the stainless steel block corresponds to the position of the metal sheet.

[0009] As a preferred technical solution, the metal sheet has an upper end and a lower end. The upper end of the metal sheet has a planar structure and is welded to the outer peripheral surface of the stainless steel block. The lower end of the metal sheet has a curved structure and is in contact with the inner wall of the heating rod shell.

[0010] As a preferred technical solution, the outer periphery of the thermocouple lead is covered with an insulating sleeve layer, and the outer periphery of the insulating sleeve is also covered with a protective sleeve layer.

[0011] As a preferred technical solution, the traction assembly includes: a positioning bolt, a traction head, and a traction rope. The upper end of the traction head is provided with a solid conical structure and has a traction rope hole, and the lower end is provided with a hollow structure and has a first positioning bolt hole. The upper end of the solid rod has a second positioning bolt hole in the radial direction. The lower end of the traction head is covered on the solid rod. The positioning bolt is inserted into the first positioning bolt hole and the second positioning bolt hole for connection and fixation. The traction rope is tied and connected to the traction rope hole.

[0012] As a preferred technical solution, the number of mounting block components is three to eight.

[0013] As a preferred technical solution, the number of thermocouple temperature probes in each group of thermocouples is three to six.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The two-dimensional temperature field measuring device for the narrow space inside the heating rod of this invention achieves stable clamping of thermocouples through the mounting block assembly. Multiple sets of thermocouple temperature measuring heads arranged along the axial direction of the solid rod can realize the synchronous measurement of wall temperature at multiple temperature measuring sections distributed along the axial direction. Multiple thermocouple temperature measuring heads arranged in a ring array can realize the synchronous measurement of wall temperature at multiple points in the circumferential direction. Therefore, the measuring device of this invention can realize the synchronous measurement of wall temperature at multiple points in the axial and circumferential directions of the heating rod shell. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the two-dimensional temperature field measuring device in the narrow space inside the heating rod in this embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at section AA;

[0018] Figure 3 This is a schematic diagram of the structure of the mounting block assembly and thermocouple temperature measuring head in an embodiment of this utility model;

[0019] Figure 4 This is a cross-sectional view of the mounting block assembly and thermocouple temperature sensor in an embodiment of this utility model. The cross-sectional view corresponds to... Figure 2 Middle BB section;

[0020] Figure 5 This is a cross-sectional view of the mounting block assembly and thermocouple temperature sensor in an embodiment of this utility model. The cross-sectional view corresponds to... Figure 2 The middle CC section;

[0021] Figure 6 This is a schematic diagram of the traction component in an embodiment of the present invention. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to specific embodiments.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model 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 utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] See Figures 1 to 6 This embodiment provides a two-dimensional temperature field measurement device for a narrow space inside a heating rod, including a solid rod 4, a mounting block assembly, a thermocouple, and a traction assembly.

[0026] A solid rod 4 extends into the heating rod housing 5, with its upper end protruding from the top of the heating rod housing 5. The solid rod 4 is made of insulating material, such as high-temperature resistant plastic or ceramic. The top of the heating rod housing 5 is configured as a cover structure, with corresponding through holes for the solid rod 4 and thermocouple leads to pass through.

[0027] Multiple mounting block assemblies are distributed and fixed on the solid rod 4 from top to bottom, with three to eight mounting block assemblies in total. In this embodiment, as shown... Figure 1 As shown, three sets of mounting block assemblies are arranged from top to bottom on the solid rod 4, located at the bottom, middle, and top of the solid rod 4 respectively, and the three sets of mounting block assemblies are arranged at equal intervals. However, this is not a limitation. In other embodiments, the number of mounting block assemblies can be set to other quantities according to experimental requirements, and the distance can also be set to unequal intervals according to experimental requirements.

[0028] The thermocouples are in multiple groups, each group including multiple thermocouple sensing heads 3 and thermocouple leads 6 connected to the thermocouple sensing heads 3. The multiple thermocouple sensing heads 3 in each group are evenly distributed in a ring array and fixed on the same mounting block assembly. The number of thermocouple sensing heads 3 in each group is three to six. In this embodiment, as... Figure 2 As shown, the number of thermocouple temperature measuring heads 3 is set to six.

[0029] The thermocouple temperature sensor 3 is a metal strip made of conventional thermocouple metal materials. The thermocouple temperature sensor 3 is used to detect the temperature of its location. Each metal strip 3 is connected to a thermocouple lead 6 by welding. The axial direction of the thermocouple lead 6 is covered by an insulating sleeve layer, and the outer periphery of the insulating sleeve is also covered by a protective sleeve layer. All thermocouple leads 6 are led out from the top of the heating rod housing 5 and connected to a junction box (not shown in the figure). The thermocouple junction box is connected to a data acquisition unit (not shown in the figure), and the operator views the temperature measurement data through the display screen of the data acquisition unit. Both the junction box and the data acquisition unit are commercially available products using existing technology, and their installation and connection methods are conventional methods of existing technology.

[0030] See Figures 2 to 5 Each mounting block assembly includes a fastener 2 and a stainless steel block 1.

[0031] Fastener 2 is made of insulating material, such as high-temperature resistant plastic or ceramic. Fastener 2 consists of two semi-ring structures joined together to form a circular structure. Figure 2 The diagram illustrates the assembled annular structure of the fastener 2. The surface of the solid rod 4 has a recessed area for mounting the fastener 2, and the semi-annular structure of the fastener 2 is correspondingly inserted into this recessed area. The semi-annular structure of the fastener 2 also has horizontal bolt holes; the number and position of these holes can be adjusted according to the dimensions of the fastener, see [reference needed]. Figure 4 In this embodiment, horizontal bolt holes 13 and 14 are provided. The first bolt 7 is installed in each of the horizontal bolt holes (see...). Figure 1 The first bolt connects to the corresponding bolt hole on the solid rod 4, which serves to lock and fix it.

[0032] Stainless steel block 1 is composed of two stainless steel semi-rings joined together to form a circular structure. See also Figure 5 The surface of the fastener 2 has a recessed area for mounting the stainless steel block 1, and the stainless steel semi-ring is correspondingly inserted and mounted in this recessed area. See also Figure 5 No. 12, the stainless steel half-ring has bolt holes on its lower end face, and the fastener 2 has corresponding bolt holes, which are connected. The second bolt (not shown in the figure) is inserted into the bolt holes of the fastener 2 and the stainless steel half-ring for bolt connection and fixation.

[0033] Metal sheets 3 (i.e., thermocouple temperature probes) are welded and fixed to the outer circumference of the stainless steel block 1. In this embodiment, there are six metal sheets 3, with three metal sheets 3 welded to each stainless steel semi-ring. Each metal sheet 3 has an upper end and a lower end. The upper end of the metal sheet 3 has a planar structure and is welded to the outer circumference of the stainless steel block 1. The lower end of the metal sheet 3 has a curved structure and contacts the inner wall of the heating rod housing 5. The curved metal sheet has a certain degree of elasticity, which allows it to better contact the inner wall of the heating rod housing 5.

[0034] See Figure 5 In the reference numeral 11, the fixing part 2 and the stainless steel block 1 are respectively provided with lead channels for the thermocouple lead 6 to pass through. The lead channel of the fixing part 2 is connected to the lead channel of the stainless steel block 1. The outlet of the lead channel of the stainless steel block 1 corresponds to the position of the metal plate 3.

[0035] The traction assembly connects to the upper end of solid bar 4 and is used to pull the solid bar. See also Figure 6 The traction assembly includes a positioning bolt 8, a traction head 9, and a traction rope 10. The upper end of the traction head 9 has a solid conical structure and a traction rope hole, while the lower end of the traction head 9 has a hollow structure and a first positioning bolt hole. The upper end of the solid rod 4 has a second positioning bolt hole in the radial direction. The lower end of the traction head 9 covers the solid rod 4, and the positioning bolt 8 is inserted into the first and second positioning bolt holes for connection and fixation. The traction rope 10 is threaded through and connected to the traction rope hole. In specific implementations, the traction rope 10 can be manually pulled to move the rod, or it can be tied to an experimental device with a pulling function for pulling. Pulling the traction rope 10 causes the solid rod to move within the heating rod housing 5, allowing adjustment of the temperature measuring surface position.

[0036] The two-dimensional temperature field measuring device for the confined space inside the heating rod provided in this embodiment, because the solid rod 4 is equipped with three sets of mounting block assemblies and three sets of thermocouple temperature measuring heads 3, can simultaneously and synchronously measure the wall temperature of three temperature measuring sections distributed along the axial direction. Since each set has six thermocouple temperature measuring heads, it can simultaneously and synchronously measure the wall temperature at six temperature measuring points circumferentially distributed on one temperature measuring section. Therefore, the measuring device of this invention can achieve simultaneous multi-point axial and circumferential multi-point measurement of the wall temperature of the heating rod shell.

[0037] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make non-inventive modifications to this embodiment as needed, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A heating rod inner wall narrow space two-dimensional temperature field measuring device, characterized in that, include: Solid rod, mounting block assembly, thermocouple, traction assembly, The solid rod extends into the heating rod housing, and the upper end of the solid rod protrudes from the top of the heating rod housing. Multiple mounting block assemblies are fixed to the solid rod from top to bottom. The thermocouples are in multiple groups, each group comprising multiple thermocouple temperature probes evenly distributed and fixed in a ring array on the same mounting block assembly. Each thermocouple temperature probe is a metal plate, and each metal plate is connected to a thermocouple lead. All thermocouple leads extend from the top of the heating rod housing and connect to a junction box. The traction assembly is connected to the upper end of the solid rod.

2. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 1, characterized in that: Each mounting block assembly includes a fastener and a stainless steel block. The fastener is composed of two semi-ring structures joined together. The surface of the solid rod has a groove area for installing the fastener. Horizontal bolt holes are provided on the semi-ring structures, and a first bolt is installed in the horizontal bolt holes. The first bolt connects to the solid rod. The stainless steel block is composed of two stainless steel semi-rings joined together. The surface of the fixing component has a groove area for mounting the stainless steel block. Bolt holes are opened on the stainless steel semi-rings, and corresponding bolt holes are opened on the fixing component. A second bolt is inserted into the bolt holes of the fixing component and the stainless steel semi-rings for bolt connection and fixation. The metal sheet is welded and fixed to the outer circumferential surface of the stainless steel block.

3. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 2, characterized in that: The fixing component and the stainless steel block are respectively provided with lead channels for thermocouple leads to pass through. The lead channel of the fixing component is connected to the lead channel of the stainless steel block, and the outlet of the lead channel of the stainless steel block corresponds to the position of the metal sheet.

4. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 2, characterized in that: The metal sheet has an upper end and a lower end. The upper end of the metal sheet has a planar structure and is welded to the outer peripheral surface of the stainless steel block. The lower end of the metal sheet has a curved structure and is in contact with the inner wall of the heating rod housing.

5. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 1, characterized in that: The thermocouple lead is covered with an insulating sleeve layer, and the insulating sleeve is further covered with a protective sleeve layer.

6. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 1, characterized in that: The traction assembly includes: a positioning bolt, a traction head, and a traction rope. The upper end of the traction head is provided with a solid conical structure and has a traction rope hole, while the lower end is provided with a hollow structure and has a first positioning bolt hole. The upper end of the solid rod has a second positioning bolt hole in the radial direction. The lower end of the traction head is covered on the solid rod. The positioning bolt is inserted into the first positioning bolt hole and the second positioning bolt hole for connection and fixation. The traction rope is tied and connected to the traction rope hole.

7. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 1, characterized in that: The number of mounting block components is three to eight.

8. The two-dimensional temperature field measuring device for the narrow space inside the heating rod as described in claim 1, characterized in that: The number of thermocouple probes in each thermocouple group is three to six.

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