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

Abstract

The utility model discloses a fan foundation pre -buried cable pipe arrangement with ground source heat pump temperature control system, will be used for wind driven generator bottom low voltage cable wiring pre -buried cable pipe arrangement in the extended fan foundation middle pier middle part and fan foundation below, cooling pipe and heat exchange pipe are connected in proper order, and cooling pipe is arranged around pre -buried cable pipe in spiral shape, and vertical heat exchange pipe is vertically arranged at a certain depth of underground. Cooling pipe and heat exchange pipe all access ground source heat pump control box, and its power and data are connected to the box type transformer of wind driven generator through the cable in power supply and communication cable pipe. The utility model can pass through condensate liquid circulation, and the heat quantity of low voltage cable is conducted to the earth, and the problem that the cable laying quantity and interval are limited because of the cable pipe because temperature control design condition does not satisfy is solved.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology and relates to a pre-embedded cable pipe arrangement structure for wind turbine foundation with a ground source heat pump temperature control system, which can be used for large-volume concrete pouring of wind turbine foundation and nacelle temperature control. Background Technology

[0002] Wind power is a clean energy source, characterized by its renewability, lack of pollution, high energy output, and promising future. Vigorously developing clean energy is a strategic choice for countries worldwide. Onshore wind turbines transmit electricity through cable conduits embedded in the turbine foundation. These conduits generate significant heat during operation; improper heat dissipation can lead to problems such as arcing, conductor overload, and increased conductor resistance, severely impacting the wind turbine's power generation performance and operational safety. With the continuous increase in the capacity of individual wind turbine units, the heat generation and quantity of cable conduits are constantly increasing, posing a significant challenge to cable conduit placement given the limited space within the turbine foundation. Utility Model Content

[0003] The purpose of this utility model is to provide a pre-embedded cable pipe arrangement for a wind turbine foundation with a ground source heat pump temperature control system, so as 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 as described in the background art.

[0004] To achieve the above objectives, according to the first aspect of this utility model, the present utility model provides the following technical solution:

[0005] A pre-embedded cable conduit arrangement structure for a wind turbine foundation equipped with a ground source heat pump temperature control system is disclosed. The pre-embedded cable conduits for low-voltage cable routing at the bottom of the wind turbine are sequentially arranged in the middle of the extended wind turbine foundation pier and below the wind turbine foundation. The structure is characterized by a cooling pipe located around the periphery of the pre-embedded cable conduit, also arranged in the middle of the extended wind turbine foundation pier and below the wind turbine foundation. The arrangement structure further includes a heat exchange pipe, with the downstream end of the cooling pipe connected to the upstream end of the heat exchange pipe. The cooling pipe is located underground, and a heat exchange medium flows through the cooling pipe and the heat exchange pipe, cooling the heat exchange medium through the cold air of the earth. The arrangement structure also includes 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, and the upstream end of the cooling pipe is connected to the outlet of the ground source heat pump control box. The power and data of the ground source heat pump control box are connected to the box-type transformer of the wind turbine through cables in the power and communication cable conduit.

[0006] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[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 in a layered laying manner, and are arranged in an overall L shape.

[0009] The cooling pipes are spirally wound around the outside of the embedded cable duct array, 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 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 arranged in 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 form an overall L shape. The vertical pipe bracket is a cubic frame structure. There is a steel pipe extending downward from the top along the vertical direction on the frame structure. There is a bracket cantilever on it, and there is a hanging groove on the bracket cantilever 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 connected by steel pipes. There are several bracket grooves on the horizontal structure of the "eye" - shaped frame for fixing the embedded cable duct and hanging buckles for fixing the cooling pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] (1) Based on the ground source heat pump technology, the present utility model sets a temperature control system in the fan foundation, conducts the heat generated by the low - voltage cable to the ground through the heat exchange medium to cool it, and realizes an energy - efficient cooling mode through power assistance.

[0015] (2) The present utility model can monitor the temperature of the low - voltage cable of the wind turbine, avoiding property losses and potential safety hazards caused by the cable being burned due to over - high temperature.

[0016] (3) By cooling the embedded cable ducts at the bottom of the fan foundation, the present utility model effectively increases the current - carrying capacity of the low - voltage cable, which is helpful for the practical application of wind turbines with larger single - unit capacity models.

[0017] (4) In this utility model, the pre-embedded cable pipe positioning and spiral cooling pipe arrangement can be realized by pre-setting fixed brackets, and can be poured or backfilled at one time. This solves the problem that the cooling pipe is difficult to install and fix when laying cables in layers. Compared with the construction method of "laying one layer and filling one layer" when laying cables in layers, it greatly reduces the construction difficulty and improves the construction efficiency. Attached Figure Description

[0018] Figure 1 This is a front view of a specific embodiment of the present utility model;

[0019] Figure 2 This is a detailed view of the upper part of the pre-embedded cable pipe and cooling pipe in a specific embodiment of this utility model;

[0020] Figure 3 This is a detailed view of the lower part of the pre-embedded cable pipe and cooling pipe in a specific embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the pre-embedded cable pipe and cooling pipe in a specific embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of a vertical heat exchange tube in a specific embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the interior of the ground source heat pump control box in a specific embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of an overall embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of a fixed bracket structure according to a specific embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of a vertical pipe support structure according to a specific embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of a horizontal pipe support structure according to a specific embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] Please see Figure 1-7This is a specific embodiment of the pre-embedded cable conduit arrangement structure for a wind turbine foundation equipped with a ground source heat pump temperature control system according to this utility model. The scheme includes a pre-embedded cable conduit 1, a cooling pipe 2, a heat exchange pipe 3, a ground source heat pump control box 4, and a power and communication cable conduit 5. The pre-embedded cable conduit 1 is used for the low-voltage cable routing at the bottom of the wind turbine generator, and is arranged in the middle of the central pier 6 of the wind turbine foundation and below the wind turbine foundation. The cooling pipe 2 and the heat exchange pipe 3 are connected in sequence, with the heat exchange pipe 3 located downstream of the cooling pipe 2. The cooling pipe 2 is arranged in the middle of the central pier 6 of the extended wind turbine foundation and below the wind turbine foundation, located around the pre-embedded cable conduit 1. The heat exchange pipe 3 extends to a certain depth underground, utilizing the geothermal cooling capacity to pre-cool the heat exchange medium; it can be arranged vertically. The ground source heat pump control box 4 contains a circulating water pump 401 and a ground source heat pump main unit 402. Its power and data are connected to the box-type transformer of the wind turbine generator through cables in the power and communication cable conduit 5.

[0030] The pre-embedded cable conduit 1 is pre-embedded in the middle of the pier 6 and below the wind turbine foundation in a layered manner, arranged in an L-shape. The cooling pipe 2 is spirally wrapped around the outside of the pre-embedded cable conduit 1 array. The downstream end of the cooling pipe 2 is connected to the heat exchange pipe, and the upstream end is connected to the ground source heat pump unit. The spiral arrangement of the cooling pipe 2 can greatly improve the cooling efficiency of the pre-embedded cable conduit 1 and prevent overheating of the pre-embedded cable conduit 1 from causing overload of the wire core.

[0031] The heat exchange tube 3 is buried underground through drilling. A heat exchange medium circulates within it, allowing some of the heat absorbed from the area where the pre-buried cable conduit 1 is laid to exchange with the underground soil before being transferred underground for cooling. Considering the cooling effect, the heat exchange tube 3 can be a single U-shaped tube or several U-shaped tubes connected in series. The heat exchange medium flowing in both the cooling tube 2 and the heat exchange tube 3 must meet anti-freezing requirements.

[0032] The ground source heat pump control box 4 is mounted on the ground next to the wind turbine tower using a support frame 404. Inside the box, a circulating water pump 401, a ground source heat pump main unit 402, and an internal guide pipe 403 are arranged. The inlet of the circulating water pump 401 is connected to the inlet end of the internal guide pipe 403, which serves 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. The outlet of the ground source heat pump main unit 402 is connected to the outlet end of the internal guide pipe 403, which serves 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. Its working principle is as follows: During the operation of the wind turbine, 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℃ all year round, which is an ideal cold source. When the equipment is running, the heat exchange medium (heat source) in the heat exchange tube 3 is driven by the circulating water pump 401 to flow underground and introduce heat energy into the ground to achieve cooling. Then, it flows into the compressor of the ground source heat pump host 402 through the internal guide pipe 403 and the circulating water pump 401, and achieves secondary cooling through the compressor. 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) flows into the cooling pipe 2 through the internal guide pipe 403 and absorbs the heat of the pre-buried cable pipe 1 to cool the buried cable pipe 1. The heated heat exchange medium flows back into the ground to cool down, and the above cycle is repeated continuously.

[0033] An electronic thermometer 201 is installed at the top of the pre-buried cable conduit 1, and the temperature signal is transmitted to the temperature monitoring system in the ground source heat pump control box 4 through the shielded twisted pair cable in the data cable conduit 203.

[0034] Furthermore, this utility model also provides a fixed support that can effectively reduce construction difficulty and improve construction efficiency; the fixed support includes a vertical pipe support 11 and a horizontal pipe support 12. The vertical pipe support 11 is a cubic frame structure, as shown in this embodiment. Figure 9 As shown, it is constructed from 12 stainless steel pipes 1101. Vertical stainless steel pipes perpendicular to the middle of the top 4 stainless steel pipes 1101 are respectively arranged, and several support cantilever arms 1102 protruding into the cubic frame structure are provided along the stainless steel pipes. The support cantilever arms 1102 are provided with hanging grooves 1103 for supporting and fixing the upper cooling pipe 2.

[0035] In this embodiment, as Figure 10As shown in the figure, the horizontal pipe support 12 includes two "eye" - shaped frames 1201 each composed of 8 stainless - steel pipes 1101, and 2 stainless - steel pipes 1101 at the bottom for connecting two adjacent "eye" - shaped frames 1201. In this embodiment, each "eye" - shaped frame 1201 is composed of one horizontal stainless - steel pipe at the top and bottom, 4 horizontal stainless - steel pipes in the middle, and 2 vertical stainless - steel pipes. The horizontal stainless - steel pipes in the middle are provided with 4 layers of cable supports 1202, and 5 support grooves 1203 are arranged on each layer of cable support 1202 for fixing the embedded cable pipes. A suspension buckle 1204 is arranged in the middle of the stainless - steel pipe 1101 at the top of the "eye" - shaped frame 1201 for fixing the cooling pipe corresponding to the cable running under the fan foundation; the suspension buckle 1204 can adopt any form such as hook - shaped or clamp - shaped that can fix the cooling pipe.

[0036] According to a specific embodiment of the present utility model, the construction of the embedded cable pipe 1, cooling pipe 2, heat - exchange pipe 3, data - cable pipe 203, and power - and - communication cable pipe 5 includes the following steps:

[0037] Step 1: Preparation work for pipe embedding

[0038] Confirm the quantity and laying path of all embedded pipes, and use an excavator to excavate the foundation pit;

[0039] Step 2: Install the embedded cable pipe 1 and data - cable pipe 203:

[0040] Preset fixed supports, vertically set the vertical pipe support 11 in the middle of the middle pier 6 of the extended fan foundation and under the fan foundation, set several horizontal pipe supports 12 parallel to each other in sequence under the fan foundation, and lay the above - mentioned embedded cable pipe 1 in layers in the middle of the middle pier 6 of the extended fan foundation and under the fan foundation according to the layout plan of the low - voltage cables. Specifically, as Figure 8 shown, the embedded cable pipe 1 passes through the vertical pipe support 11 and exits from its lower section and then passes through the horizontal pipe support 12, and is fixed within the horizontal pipe support 12; an electronic thermometer is set at the top of the embedded cable pipe, and the data - cable pipe 203 is connected. The data - cable pipe 203 has the same running direction as the embedded cable pipe and can also be fixed with the same fixed support;

[0041] Step 3: Install the cooling pipe 2 and vertical heat - exchange pipe 3:

[0042] Cooling pipe 2 is installed spirally around the pre-buried cable conduit 1. The upper section of cooling pipe 2, the vertical part that cools the cable running through the vertical pipe support 11, is fixed by the suspension groove in the vertical pipe support 11. The lower section, the horizontal part that cools the cable running below the fan foundation, is fixed by the suspension clip 1204 in the horizontal pipe support 12. Heat exchange pipe 3 is then installed vertically by drilling. The burial depth of heat exchange pipe 3 depends on the local hydrogeological conditions, generally 20-60m. One end of the cooling pipe is connected to the vertical heat exchange pipe using elbows, pipe clamps, pipe fittings, etc. Heat exchange pipe 3, cooling pipe 2, and data cable conduit are then connected to the ground source heat pump control box 4, ensuring the connections are secure and sealed.

[0043] 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. At the same time, make a safety mark 7 at 40cm underground to mark the underground pre-buried cable pipe 1.

[0044] The specific embodiments described in this utility model are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A fan foundation pre-embedded cable pipe arrangement structure with a ground source heat pump temperature control system, a pre-embedded cable pipe (1) of a low-voltage cable wiring at the bottom of a wind turbine is arranged in the middle of an extended fan foundation pier (6) and below the fan foundation in sequence, characterized in that, A cooling pipe (2) is provided around the pre-buried cable pipe (1). The cooling pipe (2) is also arranged in the middle of the pier (6) of the extended wind turbine foundation and below the wind turbine 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 located underground. The heat exchange medium flows in the cooling pipe (2) and the heat exchange pipe (3). The heat exchange medium is cooled by the cold energy 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 end 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 transformer of the wind turbine generator through the cable in the power supply and communication cable pipe (5).

2. The fan powered base pre-embedded cable tube arrangement structure with a ground source heat pump temperature control system according to claim 1, characterized in that, The heat exchange tubes (3) are vertically arranged underground.

3. The fan powered base pre-embedded cable tube arrangement with a ground source heat pump temperature control system according to claim 1, wherein, The pre-embedded cable pipe (1) is pre-embedded in the middle of the pier (6) of the extended wind turbine foundation and below the wind turbine foundation in a layered manner, and the whole is arranged in an L-shape.

4. The fan powered base pre-embedded cable tube arrangement with a ground source heat pump temperature control system according to claim 1, wherein, The cooling pipe (2) is spirally wrapped around the outside of the pre-embedded cable pipe (1) array.

5. The fan powered base pre-embedded cable tube arrangement with a ground source heat pump temperature control system according to claim 1, wherein: An electronic thermometer (201) is installed on the top of the pre-embedded cable conduit (1), and the temperature signal is transmitted to the temperature monitoring system in the ground source heat pump control box (4) through the shielded twisted pair in the data cable conduit (203).

6. The fan powered base pre-embedded cable tube arrangement with a ground source heat pump temperature control system according to claim 1, wherein: The ground source heat pump control box (4) is mounted on the ground next to the wind turbine tower using a support frame (404). The box contains a circulating water pump (401), a ground source heat pump host (402), and an internal guide pipe (403). The ground source heat pump host (402) includes a compressor and a temperature monitoring system. The outlet end of the heat exchange tube (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). With the cooperation of the temperature monitoring system, the temperature of the heat exchange medium (202) is reduced to below 8°C. Then, it flows into the cooling pipe (2) through the internal guide pipe (403) at the outlet end to cool the pre-buried cable pipe.

7. The fan powered base pre-embedded cable tube arrangement with a ground source heat pump temperature control system according to claim 1, wherein: The described layout structure is provided with a fixed support, and the fixed support includes a vertical pipe support (11) and a plurality of horizontal pipe supports (12). The horizontal pipe supports (12) are arranged in parallel in sequence on one side of the vertical pipe support (11), and the vertical pipe support (11) and the horizontal pipe supports (12) as a whole form an L shape; the vertical pipe support (11) is a cubic frame structure, on which there is a steel pipe extending downward from the top along the vertical direction, and there is a support cantilever (1102) on it. The support cantilever (1102) has a hanging groove (1103) for erecting and fixing the cooling pipe (2). The horizontal pipe support (12) is two parallel "eye" - shaped frames (1201). The bottoms of the two "eye" - shaped frames (1201) are fixedly connected by steel pipes. On the transverse structure of the "eye" - shaped frame (1201), there are a number of support grooves (1203) for fixing the embedded cable pipe (1) and hanging buckles (1204) for fixing the cooling pipe (2).

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