Temperature measuring wire fixing protection device for borehole wall temperature measurement of ground source heat pump

Abstract

The utility model discloses a kind of temperature measurement line fixed protection device for ground source heat pump buried pipe hole wall temperature measurement, including fixing part, protection shell and connecting assembly;Fixing part is provided with the isolation cavity for isolating and limiting buried pipe and the through hole for cooperating with temperature measurement line, protection shell is set on the side wall of fixing part close to through hole, protection shell is connected with fixing part by connecting assembly;Different buried pipes are physically isolated by the isolation cavity in fixing part in the scheme, avoid the torsion of adjacent pre-buried pipe in the process of long-distance pipeline lowering, lead to waterway not smooth influence measurement, while through hole is set on fixing part in the scheme, for the position of temperature measurement line is forcedly fixed, make the position of temperature measurement line close to wall surface, temperature measurement line can more accurately measure the temperature near the wall surface of hole wall, can significantly improve geotechnical thermal conductivity coefficient inversion precision;Protection shell can be set to protect temperature measurement line.

Description

Technical Field

[0001] This utility model relates to the field of ground source heat pump system installation, and in particular to a temperature measuring wire fixing and protection device for measuring the temperature of the buried pipe wall of a ground source heat pump. Background Technology

[0002] In the design and optimization of vertical buried pipe ground source heat pump systems, the core foundation is the accurate acquisition of the thermal properties of underground soil and rock, and thermal response testing is a key technical means to achieve this goal. The common practice in existing projects is to invert the thermal properties of the soil and rock by monitoring the inlet and outlet temperatures of the circulating fluid within the buried pipe. However, this method only obtains the overall heat exchange performance between the fluid in the buried pipe and the soil and rock mass, and cannot effectively distinguish and accurately calculate the thermal resistance of the buried pipe wall, the backfill grouting material layer, and the soil and rock mass itself. This leads to significant errors in the inversion results, restricting the accuracy of system design and operational efficiency.

[0003] To improve testing accuracy, a direct technical approach is to place the temperature sensing wire directly inside the borehole and ensure it fits tightly against the borehole wall, aiming to obtain a more accurate temperature response closer to the actual soil and rock mass. However, this approach faces significant challenges in practical engineering applications. First, during the mechanical pressing of the buried pipe to depths exceeding 100 meters, the temperature sensing wire inevitably experiences intense friction and compression against the rough borehole wall, easily leading to wear of the cable sheath, breakage of internal wires, and permanent damage to the sensor. Second, during the grouting and backfilling stage, the flowing grout generates strong scouring forces, potentially causing the originally positioned temperature sensing wire to shift or deviate from its preset position, resulting in inaccurate temperature measurement points and an inability to accurately reflect the temperature field at a specific depth. Furthermore, while adding a rigid protective sleeve to protect the temperature sensing wire can alleviate wear to some extent, it alters the borehole structure, hindering the smooth flow and dense filling of the grouting material, creating thermal resistance, and ultimately reducing the overall heat exchange efficiency between the buried pipe and the surrounding soil and rock. It may also alter the original dimensions of the buried pipe system, causing inconvenience during construction.

[0004] Existing temperature monitoring solutions, such as multi-channel computer-controlled online monitoring systems or digital bus-based temperature sensing cables, can achieve multi-point temperature monitoring. However, their design and application primarily focus on the accuracy of the sensors themselves and the signal transmission method, failing to fundamentally solve the challenges of physical protection and precise positioning of sensors in deep well environments. Some solutions suggest placing the temperature sensing cable inside a U-shaped conduit for easier maintenance, but this still doesn't address the effective protection and positioning issues when placed outside the conduit. Therefore, under the current technological context, there is an urgent need for a new technical solution that can effectively protect the temperature sensing cable from downward pressure abrasion and grouting erosion during deep well buried pipe construction, ensure stable adhesion along the borehole wall, accurate temperature measurement point positioning, and without affecting the grouting process and the normal heat exchange function of the buried pipe. Utility Model Content

[0005] The purpose of this utility model is to provide a temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump, which solves the problem of the temperature measuring wire being worn or deformed by the borehole wall during the pressing and grouting process.

[0006] This utility model is achieved through the following solution: A temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump includes a fixing component, a protective shell, and a connecting assembly. The fixing component is provided with an isolation cavity for isolating and limiting the buried pipe and a through hole for cooperating with the temperature measuring wire. The protective shell is disposed on the side wall of the fixing component near the through hole, and the protective shell is connected to the fixing component through the connecting assembly.

[0007] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump, the fixing component includes a support part and an isolation part. The support part and the isolation part are set at a predetermined angle, and an isolation cavity is formed between the support part and the isolation part. The end of the support part extends to a position close to the borehole, and the end of the isolation part is set at a predetermined distance from the borehole wall. The protective shell is set in the area between the support part and the borehole wall.

[0008] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the borehole temperature of a ground source heat pump, the end face of the support part is an arc-shaped end face, and the end face structure of the protective shell is an arc-shaped structure adapted to the end face of the support part.

[0009] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the borehole temperature of a ground source heat pump, the through hole is set on the central axis of the end of the support part, the center position of the protective shell is collinear with the central axis of the end of the support part, and the coverage area of ​​the protective shell is not greater than the area of ​​the end of the support part.

[0010] Based on the structure of the above-mentioned temperature measuring line fixing and protection device for measuring the borehole temperature of a ground source heat pump, the central axis of the support part is perpendicular to the central axis of the isolation part. Specifically, the isolation part includes a first blocking part and a second blocking part. The ends of the first blocking part and the second blocking part are convex arc-shaped structures, and the sidewalls of the first blocking part and the second blocking part are concave arc-shaped structures.

[0011] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump, the support part specifically includes a first support member and a second support member. The ends of the first support member and the second support member are convex arc-shaped structures, and the sidewalls of the first support member and the second support member are concave arc-shaped structures. The concave arc-shaped structures of the first support member and the first blocking part, as well as the concave arc-shaped structures of the second support member and the second blocking part, form an open cavity structure for isolating the buried pipe.

[0012] Based on the structure of the above-mentioned temperature measuring line fixing and protection device for measuring the borehole temperature of a ground source heat pump, the curvature of the concave arc structure of the first and second blocking parts is different from the curvature of the first support and the concave arc structure of the first blocking part.

[0013] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the wall temperature of the buried pipe of a ground source heat pump, the end of the support is provided with multiple fixing holes, and the protective shell is provided with mating holes. The protection is fixed to the side wall of the support by bolts.

[0014] Based on the structure of the above-mentioned temperature measuring wire fixing protection device for measuring the borehole temperature of a ground source heat pump, the upper and lower ends of the protective shell are respectively provided with a first contact groove and a second contact groove. The first contact groove of the adjacent protective shell can engage with the second contact groove. A first hole is provided on the first contact groove, and a second hole is provided on the second contact groove. When the first contact groove and the second contact groove are engaged, the first hole and the second hole are aligned.

[0015] Based on the structure of the above-mentioned temperature measuring wire fixing and protection device for measuring the borehole temperature of a ground source heat pump, the protective shell is provided with a locking groove and a threaded steel skeleton inside; multiple locking grooves are provided along the length of the protective shell, and the threaded steel skeleton is set in the locking groove.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. This solution physically isolates different buried pipes through the isolation cavity in the fixing component, preventing adjacent buried pipes from twisting during long-distance pipe laying, which could lead to water blockage and affect measurements. Simultaneously, the fixing component includes a through hole to forcibly fix the position of the temperature measuring wire, ensuring it is close to the borehole wall. This allows for more accurate temperature measurement near the borehole wall, significantly improving the accuracy of soil thermal conductivity inversion. A protective shell further protects the temperature measuring wire, preventing damage during lowering into the borehole.

[0017] 2. The temperature measuring line is protected throughout and positioned at intervals, with no significant displacement under a grouting pressure of 2MPa.

[0018] 3. The semi-circular protective shell does not block the slurry, and the heat exchange efficiency does not decrease.

[0019] 4. Modular structure, adaptable to different hole diameters and pipe types, improving on-site installation efficiency by more than 30%.

[0020] 5. The borehole wall temperature measurement error is <0.2°C, which can significantly improve the accuracy of soil thermal conductivity inversion. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure descriptions: 1. Fixing component; 2. Protective shell; 3. Connecting assembly; 4. Through hole; 5. Drill hole; 6. Temperature measuring tube; 7. Buried pipe; 11. Support part; 12. Isolation part; 13. Isolation cavity; 111. First support component; 112. Second support component; 113. Fixing hole; 121. First blocking part; 122. Second blocking part; 21. First contact groove; 22. Second contact groove; 23. First hole position; 24. Second hole position; 25. Locking groove; 26. Threaded steel skeleton. Detailed Implementation

[0022] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0023] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", 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 utility model and simplifying the description, and do not indicate or imply that the device or component 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.

[0025] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0026] Example 1 like Figures 1-2 As shown, this utility model provides a technical solution: A temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump includes a fixing component 1, a protective shell 2, and a connecting component 3. The fixing component 1 is provided with an isolation cavity 13 for isolating and limiting the buried pipe 7 and a through hole 4 for cooperating with the temperature measuring wire. The protective shell 2 is provided on the side wall of the fixing component 1 near the through hole 4. The protective shell 2 is connected to the fixing component 1 through the connecting component 3.

[0027] Based on the above structure, this solution uses the isolation cavity 13 in the fixing component 1 to physically isolate different buried pipes 7, avoiding the twisting of adjacent pre-buried pipes during the long-distance pipeline laying process, which would cause water blockage and affect the measurement. At the same time, this solution provides a through hole 4 on the fixing component 1 to forcibly fix the position of the temperature measuring wire, so that the position of the temperature measuring wire is close to the wall surface. The temperature measuring wire can more accurately measure the temperature near the wall surface of the borehole, which can significantly improve the inversion accuracy of the thermal conductivity of the soil and rock. The protective shell 2 can protect the temperature measuring wire and prevent damage when the temperature measuring wire is lowered into the borehole 5.

[0028] As an example, the fastener 1 may include a support portion 11 and an isolation portion 12, the support portion 11 and the isolation portion 12 are arranged at a predetermined angle, an isolation cavity 13 is formed between the support portion 11 and the isolation portion 12, the end of the support portion 11 extends to a position close to the borehole 5, the end of the isolation portion 12 is arranged at a predetermined distance from the wall of the borehole 5, and the protective shell 2 is arranged in the area between the support portion 11 and the wall of the borehole 5.

[0029] Based on the above structure, in this solution, the end of the support part 11 is set to extend to the side wall of the borehole 5, which can make the through hole 4 in the support part 11 closer to the side wall of the borehole 5, thus improving the overall test effect. The isolation part 12 only serves to isolate the adjacent buried pipe 7, so it does not need to extend to the side wall of the borehole 5. This can also reduce the overall friction when the whole device is lowered into the borehole 5.

[0030] As an example, the end face of the support part 11 is an arc-shaped end face, and the end face structure of the protective shell 2 is an arc-shaped structure that matches the end face of the support part 11.

[0031] Based on the above structure, the protective shell 2 can fit more closely to the end of the support part 11, making the entire protective shell 2 more stable during installation, and also allowing the protective shell 2 to fit more closely to the location of the temperature measuring wire.

[0032] As an example, the through hole 4 can be set on the central axis of the end of the support part 11, the center position of the protective shell 2 is collinear with the central axis of the end of the support part 11, and the coverage area of ​​the protective shell 2 is not greater than the area of ​​the end of the support part 11.

[0033] Based on the above structure, the protective shell 2 is specially positioned so that it can protect the temperature measuring line more efficiently and at a lower cost. The end of the support part 11 is a rigid structure, so the protective shell 2 does not need to protect it. The protective shell 2 only needs to protect the temperature measuring line.

[0034] As an example, the central axis of the support portion 11 can be perpendicular to the central axis of the isolation portion 12. Specifically, the isolation portion 12 may include a first blocking portion 121 and a second blocking portion 122. The ends of the first blocking portion 121 and the second blocking portion 122 are convex arc-shaped structures, and the sidewalls of the first blocking portion 121 and the second blocking portion 122 are concave arc-shaped structures.

[0035] The support portion 11 may specifically include a first support member 111 and a second support member 112. The ends of the first support member 111 and the second support member 112 are convex arc-shaped structures, and the sidewalls of the first support member 111 and the second support member 112 are concave arc-shaped structures. The concave arc-shaped structures of the first support member 111 and the first blocking portion 121, as well as the concave arc-shaped structures of the second support member 112 and the second blocking portion 122, form an open cavity structure for isolating the buried pipe 7. The curvature of the concave arc-shaped structure of the first blocking part 121 and the second blocking part 122 is different from the curvature of the concave arc-shaped structure of the first support member 111 and the first blocking part 121. Based on the above structure, by setting the isolation cavity 13 as an irregular arc shape, it can adapt to pre-embedded pipes of different sizes, so that this solution can adapt to pre-embedded pipes of different sizes within a certain range; the arc-shaped isolation cavity 13 can avoid damage to the pre-embedded pipe.

[0036] As an example, the end of the support 11 is provided with a plurality of fixing holes 113, and the protective shell 2 is provided with mating holes, so that the protective shell can be fixed to the side wall of the support 11 by bolts.

[0037] Specifically, the upper and lower ends of the protective shell 2 are respectively provided with a first contact groove 21 and a second contact groove 22. The first contact groove 21 of the adjacent protective shell 2 can engage with the second contact groove 22. A first hole 23 is provided on the first contact groove 21, and a second hole 24 is provided on the second contact groove 22. When the first contact groove 21 and the second contact groove 22 are engaged, the first hole 23 and the second hole 24 are aligned.

[0038] Based on the above structure, the connection between adjacent protective shells 2 in the middle of this solution is set on the side wall of the support part 11. On the one hand, it can ensure the connection strength between adjacent protective shells 2, and on the other hand, it can ensure the connection strength between the protective shell 2 and the support part 11.

[0039] As an example, a locking groove 25 and a threaded steel skeleton 26 are provided inside the protective shell 2; multiple locking grooves 25 are provided along the length direction of the protective shell 2, and the threaded steel skeleton 26 is provided in the locking groove 25.

[0040] Based on the above structure, since the protective shell 2 between adjacent fasteners 1 lacks strong support, the protective shell 2 is prone to damage, which in turn damages the temperature measuring wire. Therefore, a threaded steel skeleton 26 is set inside the protective shell 2 to enhance the support strength of the protective shell 2.

[0041] Installation method: After passing the temperature measuring wire through the isolation hole of the fixing part 1 on the ground, install the semi-circular protective shell 2 A and B in sections along the outside of the temperature measuring wire, and lock the two pieces with bolts; attach the threaded steel frame 26 to the back of the protective shell 2 to form a longitudinal rigid support; Fixing component 1 can be fixed to the underground pipe 7 in any of the following ways: 1) With clamp type: A 304 stainless steel clamp is fitted between the fixing part 1 and the buried pipe 7 and bolted in place; 2) Cable tie type: Use 9mm wide hydrolysis-resistant nylon cable ties to bind in a circular direction; 3) Slot type: The buried pipe 7 is directly embedded into the prefabricated slot of the fixing ring and the cover is locked.

[0042] The assembly is lowered to the designed depth along with the underground pipe 7; grouting and backfilling are then performed; the grout can freely return from both sides of the semi-circular protective shell 2, ensuring pore filling; after curing, the temperature measuring wire remains in close contact with the borehole wall without wear. After construction, the borehole wall temperature at each depth is read using a ground data acquisition device; combined with the inlet and outlet temperatures of the circulating water and the thermal parameters of the grouting material, high-precision inversion of the geotechnical thermal properties can be performed for subsequent load simulation and system optimization.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump, characterized in that: It includes a fixing component, a protective shell, and a connecting assembly; the fixing component is provided with an isolation cavity for isolating and limiting the buried pipe and a through hole for cooperating with the temperature measuring wire; the protective shell is provided on the side wall of the fixing component near the through hole; the protective shell is connected to the fixing component through the connecting assembly.

2. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 1, characterized in that: The fastener includes a support portion and an isolation portion. The support portion and the isolation portion are arranged at a predetermined angle, and an isolation cavity is formed between the support portion and the isolation portion. The end of the support portion extends to a position close to the borehole, and the end of the isolation portion is arranged at a predetermined distance from the borehole wall. The protective shell is disposed in the area between the support portion and the borehole wall.

3. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 2, characterized in that: The end face of the support is an arc-shaped end face, and the end face structure of the protective shell is an arc-shaped structure adapted to the end face of the support.

4. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 3, characterized in that: The through hole is located on the central axis of the end of the support part, the center of the protective shell is collinear with the central axis of the end of the support part, and the coverage area of ​​the protective shell is not greater than the area of ​​the end of the support part.

5. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 4, characterized in that: The central axis of the support is perpendicular to the central axis of the isolation part. Specifically, the isolation part includes a first blocking part and a second blocking part. The ends of the first blocking part and the second blocking part are convex arc-shaped structures, and the sidewalls of the first blocking part and the second blocking part are concave arc-shaped structures.

6. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 5, characterized in that: The support portion specifically includes a first support member and a second support member. The ends of the first support member and the second support member are convex arc-shaped structures, and the sidewalls of the first support member and the second support member are concave arc-shaped structures. The concave arc-shaped structures of the first support member and the first blocking portion, as well as the concave arc-shaped structures of the second support member and the second blocking portion, form an open cavity structure for isolating the buried pipe.

7. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 6, characterized in that: The curvature of the concave arc-shaped structure of the first and second blocking parts is different from the curvature of the concave arc-shaped structure of the first support and the first blocking part.

8. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 7, characterized in that: The end of the support is provided with multiple fixing holes, and the protective shell is provided with mating holes. The protective shell is fixed to the side wall of the support by bolts.

9. The temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 8, characterized in that: The upper and lower ends of the protective shell are respectively provided with a first contact groove and a second contact groove. The first contact groove of the adjacent protective shell can engage with the second contact groove. A first hole is provided on the first contact groove and a second hole is provided on the second contact groove. When the first contact groove and the second contact groove are engaged, the first hole and the second hole are aligned.

10. A temperature measuring wire fixing and protection device for measuring the borehole wall temperature of a ground source heat pump as described in claim 9, characterized in that: The protective shell is provided with a locking groove and a threaded steel skeleton inside; multiple locking grooves are provided along the length of the protective shell, and the threaded steel skeleton is set in the locking groove.

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