Fan foundation embedded cable pipe arrangement structure with ground source heat pump temperature control system

Abstract

The invention discloses a fan foundation embedded cable pipe arrangement and construction method with a ground source heat pump temperature control system, which is characterized in that an embedded cable pipe for low-voltage cable routing at the bottom of a wind driven generator is arranged in the middle of a middle pier of an extended fan foundation and below the fan foundation, and a cooling pipe and a heat exchange pipe are sequentially connected; the cooling pipe is spirally arranged around the pre-buried cable pipe, and the vertical heat exchange pipe is vertically arranged underground at a certain depth. The cooling pipe and the heat exchange pipe are both connected into a ground source heat pump control box, and a power source and data of the ground source heat pump control box are connected into a box-type transformer of the wind driven generator through cables in the power source and communication cable pipe. Heat generated by the low-voltage cable can be conducted to the ground through condensate circulation, and the problem that the cable laying number and distance are limited due to the fact that the temperature control design condition of the cable pipe is not met is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and relates to a pre-buried cable pipe arrangement structure for a wind turbine foundation equipped with a ground-source heat pump temperature control system, which can be used for large-volume concrete pouring of the wind turbine foundation and cabin temperature control. The present invention also relates to a construction method of the structure. Background Art

[0002] Wind power is a clean energy source characterized by its renewable, pollution-free nature, high energy yield, and broad prospects. Vigorously developing clean energy is a strategic choice for countries around the world. Onshore wind turbines transmit power through cable conduits embedded within the turbine foundation. This heat is generated by these conduits during operation. Improper heat dissipation can lead to arcing, wire overload, and increased conductor resistance, seriously impacting the turbine's power generation performance and operational safety. As wind turbine capacity continues to increase, the heat generated and the number of cable conduits continue to rise. This, combined with the limited space within the turbine foundation, poses significant challenges to their placement. Summary of the Invention

[0003] The purpose of the present invention is to provide a fan foundation pre-buried cable pipe arrangement and construction method with a ground source heat pump temperature control system to solve the problem caused by the large number and high heat generation of low-voltage cable pipes at the bottom of the wind turbine described in the above background technology.

[0004] To achieve the above object, according to a first aspect of the present invention, the present invention provides the following technical solutions:

[0005] A fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system, the pre-buried cable pipe for the low-voltage cable routing at the bottom of the wind turbine is sequentially arranged in the middle of the middle pier of the extended fan foundation and below the fan foundation, characterized in that a cooling pipe is provided on the outer periphery of the pre-buried cable pipe, and the cooling pipe is also arranged in the middle of the middle pier of the extended fan foundation and below the fan foundation, the arrangement structure is also provided with a heat exchange pipe, the downstream end of the cooling pipe is connected to the upstream end of the heat exchange pipe, the cooling pipe is arranged underground, and a heat exchange medium flows through the cooling pipe and the heat exchange pipe, and the heat exchange medium is cooled by the coldness of the earth; the arrangement structure is also provided with a ground source heat pump control box, the downstream end of the heat exchange pipe is connected to the inlet of the ground source heat pump control box, the upstream end of the cooling pipe is connected to the outlet end of the ground source heat pump control box, and the power supply and data of the ground source heat pump control box are connected to the box-type transformer of the wind turbine through the cables in the power supply and communication cable pipe.

[0006] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0007] The heat exchange tubes are vertically arranged underground.

[0008] The embedded cable ducts are embedded in the middle of the middle pier of the extended fan foundation and under the fan foundation by means of layered laying, and are arranged in an overall L shape.

[0009] The cooling pipes are spirally wound around the outside of the array of embedded cable ducts, which can greatly improve the cooling efficiency of the embedded cable ducts and prevent the core overload caused by overheating of the embedded cable ducts.

[0010] An electronic thermometer is set at the top of the embedded cable duct, and the temperature signal is transmitted to the temperature monitoring system in the ground source heat pump control box through the shielded twisted pair in the data cable duct.

[0011] The ground source heat pump control box is erected on the ground beside the wind turbine tower by means of a support frame. A circulating water pump, a ground source heat pump main unit and an internal diversion pipe are arranged in the box. The ground source heat pump main unit includes a compressor and a temperature monitoring system. The outlet end of the heat exchange pipe is connected to the inlet of the circulating water pump through the internal diversion pipe at the inlet end. Among them, the heat exchange medium enters the compressor from the circulating water pump, and with the cooperation of the temperature monitoring system, after the temperature of the heat exchange medium drops below 8°C, it circulates through the internal diversion pipe at the outlet end and flows into the cooling pipe to cool the embedded cable duct.

[0012] Fixed brackets are provided for the layout structure. The fixed brackets include a vertical pipe bracket and several horizontal pipe brackets. The horizontal pipe brackets are arranged in parallel in sequence on one side of the vertical pipe bracket. The vertical pipe bracket and the horizontal pipe brackets as a whole form an L shape. The vertical pipe bracket is a cubic frame structure. On this frame structure, there is a steel pipe extending downward from the top along the vertical direction, and there is a bracket cantilever on it. The bracket cantilever has a suspension groove for erecting and fixing the cooling pipe. The horizontal pipe bracket is two parallel "eye" - shaped frames. The bottoms of the two "eye" - shaped frames are fixedly connected by steel pipes. On the transverse structure of the "eye" - shaped frame, there are several bracket grooves for fixing the embedded cable ducts and suspension buckles for fixing the cooling pipes.

[0013] According to the second aspect of the present invention, the present invention also provides a construction method for the layout structure of the embedded cable ducts of the fan foundation with the ground source heat pump temperature control system. The construction method includes the following steps:

[0014] Step 1: Preparation work for pipe embedding

[0015] Confirm the quantity and laying path of all embedded pipes, and use an excavator to excavate the foundation pit;

[0016] Step 2: Install the embedded cable ducts and data cable ducts:

[0017] Preset fixed brackets and lay the pre-buried cable conduits in layers in the middle of the extended fan foundation pier and below the fan foundation according to the layout plan of the low-voltage cables. Install an electronic thermometer on the top of the pre-buried cable conduit and connect it to the data cable conduit. The direction of the data cable conduit should be consistent with that of the pre-buried cable conduit.

[0018] Step 3: Install cooling pipes and heat exchange pipes:

[0019] Install the cooling pipe in a spiral shape around the pre-buried cable pipe, and install the heat exchange pipe by drilling. The heat exchange pipe is buried at a depth of 20-60m. Connect one end of the cooling pipe to the heat exchange pipe. Connect the heat exchange pipe, cooling pipe, and data cable pipe to the ground source heat pump control box on the ground, ensuring that the connectors are firm and sealed.

[0020] Step 4: After the installation of the above-mentioned embedded pipes is completed, fill the area around them with soil or fine sand, backfill the upper layer of the foundation pit with soil, and make safety marks at a certain depth underground.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention is based on ground source heat pump technology. A temperature control system is set in the fan foundation. The heat generated by the low-voltage cable is transferred to the ground through a heat exchange medium to cool it down. With the assistance of electricity, an efficient and energy-saving cooling mode is achieved.

[0023] (2) The present invention can monitor the temperature of the low-voltage cable of the wind turbine generator to avoid property losses and safety hazards caused by the cable being burned due to excessive temperature.

[0024] (3) The present invention reduces the temperature of the pre-buried cable pipe at the bottom of the wind turbine foundation, effectively increasing the current carrying capacity of the low-voltage cable, which is conducive to the practical application of wind turbines with larger single-unit capacity.

[0025] (4) The present invention can realize the positioning of the embedded cable pipe and the arrangement of the spiral cooling pipe by pre-setting the fixing bracket, and can cast or backfill at one time, thereby solving the problem that the cooling pipe is difficult to install and fix when the cables are laid in layers. Compared with the construction method of "laying one layer and filling one layer" when laying the cables in layers, the construction difficulty is greatly reduced and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of a specific embodiment of the present invention;

[0027] Figure 2 This is a detailed diagram of the upper part of the embedded cable pipe and cooling pipe in a specific embodiment of the present invention;

[0028] Figure 3 This is a detailed view of the lower part of the embedded cable pipe and cooling pipe in a specific embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of a pre-buried cable pipe and a cooling pipe in a specific embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of a vertical heat exchange tube in a specific embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the interior of a ground source heat pump control box in a specific embodiment of the present invention;

[0032] Figure 7 It is an overall schematic diagram of a specific embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the fixing bracket structure of a specific embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of a vertical pipe support structure according to a specific embodiment of the present invention;

[0035] Figure 10 The figure is a schematic diagram of a horizontal pipe support structure according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] See also Figure 1-7 , which is a specific embodiment of the pre-buried cable pipe arrangement structure for a fan foundation with a ground-source heat pump temperature control system according to the present invention. This solution is provided with a pre-buried cable pipe 1, a cooling pipe 2, a heat exchange pipe 3, a ground-source heat pump control box 4, and a power and communication cable pipe 5. The pre-buried cable pipe 1 is used for routing low-voltage cables at the bottom of the wind turbine and is arranged in the middle of the fan foundation pier 6 and below the fan foundation. The cooling pipe 2 and the heat exchange pipe 3 are pipes connected in sequence. The heat exchange pipe 3 is located downstream of the cooling pipe 2. The cooling pipe 2 is arranged in the middle of the extended fan foundation pier 6 and below the fan foundation, and is located on the periphery of the pre-buried cable pipe 1. The heat exchange pipe 3 extends to a certain depth underground, utilizing the earth's cooling capacity to pre-cool the heat exchange medium, and can be arranged vertically. The ground-source heat pump control box 4 is provided with a circulating water pump 401 and a ground-source heat pump host 402. Its power and data are connected to the box-type transformer of the wind turbine through cables in the power and communication cable pipe 5.

[0038] The pre-buried cable conduits 1 are laid in layers in an L-shaped arrangement, located in the center of the expanded fan foundation's center pier 6 and beneath the fan foundation. The cooling pipes 2 spirally wrap around the outer edges of the pre-buried cable conduits 1. The downstream ends of the cooling pipes 2 are connected to the heat exchange tubes, while the upstream ends are connected to the ground-source heat pump unit. This spiral arrangement significantly improves the cooling efficiency of the pre-buried cable conduits 1 and prevents overheating and cable core overload.

[0039] Heat exchange tube 3 is buried underground via drilling. A heat exchange medium circulates through it, exchanging some of the heat absorbed from the area where the pre-buried cable conduit 1 is located with the subsurface soil before being transferred underground for cooling. Considering the cooling effect, heat exchange tube 3 can be a single U-shaped tube or several U-shaped tubes connected in series. The heat exchange medium flowing through both cooling tube 2 and heat exchange tube 3 must meet freezing resistance requirements.

[0040] The ground source heat pump control box 4 is erected on the ground next to the tower of the wind turbine using a support frame 404. A circulating water pump 401, a ground source heat pump main unit 402 and an internal guide pipe 403 are arranged in the box. The inlet of the circulating water pump 401 is connected to the internal guide pipe 403 at the inlet end serving as the inlet of the ground source heat pump control box 4, the inlet of the ground source heat pump main unit 402 is connected to the outlet of the circulating water pump 401, and the outlet of the ground source heat pump main unit 402 is connected to the internal guide pipe 403 at the outlet end serving as the outlet of the ground source heat pump control box 4. The ground source heat pump main unit 402 includes a compressor and a temperature monitoring system, and its working principle is as follows: During the operation of the fan, the pre-buried cable pipe 1 will release a large amount of heat and become a heat source. The underground soil can maintain a constant temperature of 10-20°C all year round, which is an ideal cold source. When the equipment is in operation, driven by the circulating water pump 401, the heat exchange medium (heat source) in the heat exchange tube 3 flows through the underground and introduces heat energy into the underground to achieve cooling; then it flows into the compressor of the ground source heat pump main unit 402 through the internal guide tube 403 and the circulating water pump 401, and the compressor achieves secondary cooling, and with the cooperation of the temperature monitoring system, the temperature of the heat exchange medium is reduced to below 8°C; the cooled heat exchange medium (cold source) circulates through the internal guide tube 403 into the cooling tube 2, and absorbs the heat of the pre-buried cable pipe 1, thereby cooling the buried cable pipe 1; the heated heat exchange medium flows back into the underground for cooling, and the above cycle is repeated continuously.

[0041] An electronic thermometer 201 is provided on the top of the pre-buried cable tube 1 , and transmits the temperature signal to the temperature monitoring system in the ground source heat pump control box 4 through the shielded twisted pair cable in the data cable tube 203 .

[0042] In addition, the present invention also provides a fixing bracket that can effectively reduce the construction difficulty and improve the construction efficiency; the fixing bracket includes a vertical pipe bracket 11 and a horizontal pipe bracket 12. The vertical pipe bracket 11 is a cubic frame structure. In this embodiment, Figure 9 As shown, it is constructed from 12 stainless steel tubes 1101. A vertical stainless steel tube is arranged perpendicular to the four stainless steel tubes 1101 at the top. Along these stainless steel tubes are several cantilever arms 1102 protruding into the cubic frame structure. These cantilever arms 1102 are provided with hanging grooves 1103 for mounting and securing the upper cooling tube 2.

[0043] In this embodiment, if Figure 10 As shown, the horizontal pipe support 12 includes two "mesh"-shaped frames 1201, each composed of eight stainless steel tubes 1101, and two stainless steel tubes 1101 at the bottom for connecting two adjacent "mesh"-shaped frames 1201. In this embodiment, each "mesh"-shaped frame 1201 is composed of a horizontal stainless steel tube at the top and bottom, four horizontal stainless steel tubes in the middle, and two longitudinal stainless steel tubes. The middle horizontal stainless steel tubes are arranged with four layers of cable supports 1202, and each layer of cable supports 1202 is provided with five bracket grooves 1203 for securing pre-buried cable pipes. A hanging clip 1204 is arranged in the middle of the stainless steel tube 1101 at the top of the "mesh"-shaped frame 1201 to secure the cooling pipe corresponding to the cable running below the fan foundation. The hanging clip 1204 can take any shape suitable for securing the cooling pipe, such as a hook or a clamp.

[0044] According to a specific embodiment of the present invention, the construction of the pre-buried cable pipe 1, cooling pipe 2, heat exchange pipe 3, data cable pipe 203, power supply and communication cable pipe 5 includes the following steps:

[0045] Step 1: Preparation for laying pipes

[0046] Confirm the quantity and laying paths of all pre-buried pipes and use excavators to excavate the foundation pit;

[0047] Step 2: Install the pre-buried cable tube 1 and data cable tube 203:

[0048] Preset fixed brackets, vertically set the vertical pipe bracket 11 in the middle of the expanded fan foundation pier 6 and below the fan foundation, set several horizontal pipe brackets 12 in parallel below the fan foundation, and lay the above-mentioned pre-buried cable pipe 1 in layers according to the layout plan of the low-voltage cable in the middle of the expanded fan foundation pier 6 and below the fan foundation. Figure 8 As shown, the pre-buried cable pipe 1 is installed in the vertical pipe support 11 and passes through the lower section thereof and then passes through the horizontal pipe support 12, and is fixed in the horizontal pipe support 12; an electronic thermometer is set on the top of the pre-buried cable pipe and connected to the data cable pipe 203. The direction of the data cable pipe 203 is consistent with that of the pre-buried cable pipe and can also be fixed with the same fixing bracket;

[0049] Step 3: Install cooling tube 2 and vertical heat exchange tube 3:

[0050] The cooling pipe 2 is installed in a spiral shape around the pre-buried cable pipe 1. The upper section of the cooling pipe 2, i.e., the vertical section for cooling the cables passing through the vertical pipe support 11, can be fixed through the hanging groove in the vertical pipe support 11. The lower section, i.e., the horizontal section for cooling the cables running under the fan foundation, can be fixed through the hanging buckle 1204 in the horizontal pipe support 12, and the heat exchange pipe 3 can be installed vertically by drilling. The buried depth of the heat exchange pipe 3 is determined according to the local hydrogeological conditions and is generally 20-60m. Use tools such as elbows, pipe clamps, and pipe joints to connect one end of the cooling pipe to the vertical heat exchange pipe, and connect the heat exchange pipe 3, cooling pipe 2, and data cable pipe to the ground source heat pump control box 4 on the ground to ensure that the connectors are firm and sealed.

[0051] Step 4: After the above-mentioned pre-buried pipe is installed, fill it with soil or fine sand 9 around it, and backfill the upper layer of the foundation pit with soil 8. At the same time, make a safety mark 7 40 cm underground to identify the underground pre-buried cable pipe 1.

[0052] The specific implementation methods described in this invention are merely illustrative of the spirit of the invention. Persons skilled in the art may make various modifications, additions, or substitute similar methods for the specific implementation methods described herein without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A pre-buried cable pipe arrangement structure for a fan foundation with a ground source heat pump temperature control system, wherein the pre-buried cable pipe (1) for the low-voltage cable routing at the bottom of the wind turbine is sequentially arranged in the middle of the expanded fan foundation pier (6) and below the fan foundation, characterized in that: A cooling pipe (2) is provided on the periphery of the pre-buried cable pipe (1). The cooling pipe (2) is also arranged in the middle of the middle pier (6) of the expanded fan foundation and below the fan foundation. The arrangement structure is also provided with a heat exchange pipe. The downstream end of the cooling pipe is connected to the upstream end of the heat exchange pipe (3). The cooling pipe (2) is arranged underground. A heat exchange medium flows through the cooling pipe (2) and the heat exchange pipe (3). The heat exchange medium is cooled by the coldness of the earth. The arrangement structure is also provided with a ground source heat pump control box (4). The downstream end of the heat exchange pipe (3) is connected to the inlet of the ground source heat pump control box (4). The upstream end of the cooling pipe (2) is connected to the outlet of the ground source heat pump control box (4). The power supply and data of the ground source heat pump control box (4) are connected to the box-type transformer of the wind turbine through the cables in the power supply and communication cable pipe (5).

2. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: The heat exchange tubes (3) are arranged vertically underground.

3. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: The pre-buried cable pipe (1) is pre-buried in the middle of the expanded fan foundation pier (6) and below the fan foundation in a layered manner, and is arranged in an L-shape as a whole.

4. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: The cooling pipe (2) is spirally wound around the outside of the pre-buried cable pipe (1) array.

5. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: An electronic thermometer (201) is provided on the top of the pre-buried cable pipe (1), and transmits a temperature signal to a temperature monitoring system in a ground source heat pump control box (4) via a shielded twisted pair in a data cable pipe (203).

6. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: The ground source heat pump control box (4) is erected on the ground next to the wind turbine tower using a support frame (404). A circulating water pump (401), a ground source heat pump main unit (402) and an internal guide pipe (403) are arranged in the box. The ground source heat pump main unit (402) includes a compressor and a temperature monitoring system. The outlet end of the heat exchange pipe (3) is connected to the inlet of the circulating water pump (401) through the internal guide pipe at the inlet end. The heat exchange medium (202) enters the compressor from the circulating water pump (401) and, with the cooperation of the temperature monitoring system, the temperature of the heat exchange medium (202) is reduced to below 8°C. The heat exchange medium then circulates through the internal guide pipe (403) at the outlet end and flows into the cooling pipe (2) to cool the pre-buried cable pipe.

7. The fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1 is characterized in that: The arrangement structure is provided with a fixed bracket, the fixed bracket comprising a vertical pipe bracket (11) and a plurality of horizontal pipe brackets (12), the horizontal pipe brackets (12) being sequentially arranged in parallel on one side of the vertical pipe bracket (11), and the vertical pipe bracket (11) and the horizontal pipe bracket (12) forming an L-shape as a whole; the vertical pipe bracket (11) is a cubic frame structure, a steel pipe extending downward from the top in a vertical direction is provided on the frame structure, a bracket cantilever (1102) is provided on the bracket cantilever (1102), and a hanging groove (1103) is provided on the bracket cantilever (1102) for erecting and fixing the cooling pipe (2); the horizontal pipe bracket (12) is two parallel "mesh"-shaped frames (1201), the bottoms of the two "mesh"-shaped frames (1201) are fixedly connected by a steel pipe, and a plurality of bracket grooves (1203) are provided on the transverse structure of the "mesh"-shaped frame (1201) for fixing the pre-buried cable pipe (1) and a hanging buckle (1204) for fixing the cooling pipe (2).

8. The construction method of the fan foundation pre-buried cable pipe arrangement structure with a ground source heat pump temperature control system according to claim 1, characterized in that: The construction method comprises the following steps: Step 1: Preparation for laying pipes Confirm the quantity and laying paths of all pre-buried pipes and use excavators to excavate the foundation pit; Step 2: Install the pre-buried cable tube (1) and data cable tube (203): A fixed bracket is preset, and the pre-buried cable pipe (1) is laid in layers in the middle of the expanded fan foundation pier (6) and below the fan foundation according to the layout plan of the low-voltage cable; an electronic thermometer is set on the top of the pre-buried cable pipe, and connected to the data cable pipe (203), and the direction of the data cable pipe (203) is consistent with that of the pre-buried cable pipe; Step 3: Install the cooling tube (2) and heat exchange tube (3): The cooling pipe (2) is installed in a spiral shape around the pre-buried cable pipe (1), and the heat exchange pipe (3) is installed by drilling. The buried depth of the heat exchange pipe is 20-60m. One end of the cooling pipe is connected to the heat exchange pipe through a pipe. The heat exchange pipe, cooling pipe, data cable pipe and ground source heat pump control box (4) on the ground are connected to ensure that the connection parts are firm and sealed. Step 4: After the above-mentioned pre-buried pipes are installed, fill the area around them with soil or fine sand (9), and backfill the upper layer of the foundation pit with soil (8), while making a safety mark (7) at a certain depth underground.

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