Large-diameter geothermal well closing valve

Abstract

The utility model provides a sealing valve for a large-diameter geothermal well. The sealing valve comprises a top pressure plate, a middle pressure plate, an elastic sealing ring and a bottom pressure plate which are coaxially arranged from top to bottom, the top pressure disc is a concave elastic metal disc, and a plurality of radial notches are uniformly formed in a disc body of the top pressure disc; the middle pressure plate and the bottom pressure plate are planar metal discs; the elastic sealing ring is a planar high-temperature-resistant rubber sealing ring; the middle positions of the top pressure plate, the middle pressure plate, the elastic sealing ring and the bottom pressure plate are respectively provided with a central hole for the heat-conducting medium pipe to pass through; a plurality of studs are symmetrically and fixedly arranged on a plate body of the bottom pressure plate, and each stud sequentially penetrates through a small hole in the elastic sealing ring, a small hole in the middle pressure plate and a strip-shaped hole in the top pressure plate and then is in threaded connection with a nut; through nut spinning, the top pressure plate is pressed and deformed to clamp the well wall of the geothermal well, and meanwhile, the middle pressure plate and the bottom pressure plate extrude the elastic seal. The closing valve can isolate the low-temperature part in the large-diameter geothermal well, and the influence of the low-temperature part of the geothermal well on heat collection is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal well heating, in particular to a large-caliber geothermal well closing valve. Background Art

[0002] As an efficient, environmentally friendly, and sustainable method for utilizing geothermal energy, geothermal wells offer broad application prospects and development potential. A characteristic of geothermal wells is that the temperature increases with depth. During operation, if the cooler areas of the well are not isolated, the heat exchange medium will lose some heat as it passes through the cooler well walls, even causing some material to precipitate, which will inevitably affect heat extraction efficiency. Therefore, it is necessary to isolate the cooler areas of the well and adjust the temperature accordingly.

[0003] Installing a shut-off valve at a certain depth within a geothermal well can reduce the impact of low well temperatures on heat extraction, ensuring optimal heating temperatures. If a well malfunction occurs, the shut-off valve will need to be removed and the well repaired.

[0004] Therefore, we designed a large-diameter geothermal well shut-off valve with adjustable position. Utility Model Content

[0005] The utility model aims to provide a large-diameter geothermal well closing valve, which is suitable for fully enclosed U-shaped geothermal wells with a diameter of more than 200 mm and can adjust its position in the geothermal well according to temperature changes in the geothermal well.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a large-caliber geothermal well closing valve, comprising a top pressure plate, a middle pressure plate, an elastic sealing ring, and a bottom pressure plate coaxially arranged from top to bottom;

[0008] The top pressure plate is a concave elastic metal disc with multiple radial notches evenly arranged on its body;

[0009] The middle pressure plate and the bottom pressure plate are both flat metal discs;

[0010] The elastic sealing ring is a flat high-temperature resistant rubber sealing ring;

[0011] The middle positions of the top pressure plate, the middle pressure plate, the elastic sealing ring and the bottom pressure plate are all provided with a central hole for the heat transfer medium pipe to pass through;

[0012] A plurality of studs are symmetrically fixed on the plate body of the bottom pressure plate, and each stud passes through the small hole on the elastic sealing ring, the small hole on the middle pressure plate, and the strip hole on the top pressure plate in turn and is threadedly connected to a nut; when the nut is turned, the top pressure plate is compressed and deformed to clamp the geothermal well wall, and at the same time, the elastic sealing ring is squeezed and deformed by the middle pressure plate and the bottom pressure plate to seal the geothermal well wall and the heat transfer medium pipe.

[0013] Furthermore, the initial diameters of the top pressure plate, middle pressure plate, elastic sealing ring and bottom pressure plate are all smaller than the diameter of the geothermal well, and the pressure-bearing diameters of the top pressure plate and elastic sealing ring are all larger than the diameter of the geothermal well.

[0014] Furthermore, an anti-falling washer is sleeved on the stud, and the anti-falling washer is located between the nut and the top pressure plate.

[0015] Furthermore, the large-diameter geothermal well closing valve also includes a temperature detection device, which is located above the top pressure plate and is fixed to the middle pressure plate via a column passing through one of the radial notches.

[0016] Preferably, the temperature detection device includes a housing and a microprocessor, a temperature sensor, a power module, and a communication module arranged in the housing, and the microprocessor is electrically connected to the temperature sensor, the power module, and the communication module respectively.

[0017] Preferably, the microprocessor adopts the STM32 series, the temperature sensor adopts PT100, the communication module adopts a 4G / 5G communication module, and the power module adopts a sealed battery.

[0018] Beneficial technical effects of the utility model:

[0019] The large-diameter geothermal well closing valve of the utility model is suitable for fully enclosed U-shaped geothermal wells with a diameter of more than 200 mm. By installing the closing valve of the utility model in a large-diameter geothermal well, the lower-temperature part in the well can be isolated, reducing the impact of the excessively low-temperature part of the geothermal well on heat extraction, and realizing timely adjustment of its position in the geothermal well according to the temperature change of the excessively low-temperature part in the geothermal well. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional diagram of a large-diameter geothermal well closing valve of the utility model;

[0021] Figure 2 This is a top view of a large-diameter geothermal well closing valve of the utility model;

[0022] Figure 3 This is a front view of a large-diameter geothermal well closing valve according to the present utility model;

[0023] Figure 4 for Figure 1A three-dimensional view of the middle top pressure plate;

[0024] Figure 5 for Figure 1 Top view of the middle pressure plate;

[0025] Figure 6 for Figure 1 A top view of the middle elastic sealing ring;

[0026] Figure 7 for Figure 1 Side view of the midsole pressure plate;

[0027] Figure 8 for Figure 1 Control principle diagram of the medium temperature detection device;

[0028] Figure 9 for Figure 1 Installation diagram of a large-diameter geothermal well shut-off valve;

[0029] Figure markings: 1-top pressure plate, 2-middle pressure plate, 3-elastic sealing ring, 4-bottom pressure plate, 401-stud, 5-nut, 6-anti-falling gasket, 7-temperature detection device, 701-microprocessor, 702-temperature sensor, 703-power module, 704-communication module. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] like Figure 1-8 As shown, the utility model provides a large-caliber geothermal well closing valve, comprising a top pressure plate 1, an intermediate pressure plate 2, an elastic sealing ring 3, and a bottom pressure plate 4 coaxially arranged from top to bottom; the top pressure plate 1 is a concave elastic metal disc, and a plurality of radial notches are evenly provided on its disc body; the intermediate pressure plate 2 and the bottom pressure plate 4 are both flat metal discs; the elastic sealing ring 3 is a flat high-temperature resistant rubber sealing ring; a center hole for the heat transfer medium pipe to pass through is provided in the middle positions of the top pressure plate 1, the intermediate pressure plate 2, the elastic sealing ring 3, and the bottom pressure plate 4; a plurality of studs 401 are symmetrically fixed on the disc body of the bottom pressure plate 4, and each stud 401 passes through the small hole on the elastic sealing ring 3, the small hole on the intermediate pressure plate 2, and the strip hole on the top pressure plate 1 in sequence and is then threadedly connected to a nut 5; through the spinning of the nut 5, the top pressure plate 1 is compressed and deformed to clamp the geothermal well wall, and at the same time, the intermediate pressure plate 2 and the bottom pressure plate 4 squeeze the elastic sealing ring 3 to deform it, thereby sealing the geothermal well wall and the heat transfer medium pipe.

[0032] Specifically, the top pressure plate 1 has an initial diameter smaller than the geothermal well diameter, but a diameter larger than the well diameter. When the nut 5 is screwed in, the top pressure plate 1 deforms under pressure, increasing its diameter and becoming lodged against the well wall. The diameters of the intermediate pressure plate 2, elastic sealing ring 3, and bottom pressure plate 4 are all smaller than the well diameter. When the nut 5 is screwed in, the intermediate pressure plate 2 and bottom pressure plate 4 squeeze the elastic sealing ring 3, thinning it and increasing its diameter, ensuring a seal between the well wall and the heat transfer medium pipe.

[0033] Specifically, the stud 401 is also fitted with an anti-dropout washer 6, located between the nut 5 and the top pressure plate 1. In this embodiment, the anti-dropout washer 6 can be a washer with a threaded inner hole. Once the anti-dropout washer 6 is assembled on the stud 401, it remains in place without the nut 5 installed, thus securing the top pressure plate 1, middle pressure plate 2, elastic sealing ring 3, and bottom pressure plate 4 together and preventing them from falling during disassembly.

[0034] Specifically, the temperature detection device 7 is located above the top pressure plate 1 and is fixed to the middle pressure plate 2 via a column passing through one of the radial notches. The temperature detection device 7 includes a housing and a microprocessor 701, a temperature sensor 702, a power module 703, and a communication module 704 disposed therein. The microprocessor 701 is electrically connected to the temperature sensor 702, the power module 703, and the communication module 704, respectively.

[0035] In this embodiment, microprocessor 701 uses the STM32 series, such as STM32F103 or STM32F407; temperature sensor 702 uses a PT100; communication module 704 uses a 4G / 5G communication module; and power module 703 uses a sealed battery. Power module 703 provides power. Temperature sensor 702 collects temperature data above top platen 1 in the geothermal well and uploads it to microprocessor 701, which then uploads it to the ground control center via communication module 704.

[0036] The working principle and method of a large-diameter geothermal well closing valve of the present embodiment are as follows: when the nut 5 is screwed, the top pressure plate 1 is deformed by pressure, the diameter of the top pressure plate 1 increases, and it is stuck on the wall of the geothermal well; at the same time, the middle pressure plate 2 and the bottom pressure plate 4 squeeze the elastic sealing ring 3 to make it thinner and the diameter increases, ensuring that the well wall and the heat transfer medium pipe are sealed. When it is necessary to move the closing valve, first release the pressure in the well, then use special equipment to enter the well, loosen the nut 5, so that the top pressure plate 1 releases the pressure on the well wall, and the entire closing valve becomes movable. The closing valve is then driven by special equipment to move to the specified position, and the nut 5 is re-tightened to complete the closing. In this way, the position of the closing valve in the well can be adjusted in time to achieve the purpose of controlling the temperature in the well and improving the heat extraction efficiency.

[0037] In the traditional ESG geothermal collection system, the closing valve can be installed in the recovery well; in the U-shaped well, it can be installed in the input and output wells respectively, or only in the output well.

[0038] The utility model of large-diameter geothermal well closing valve is particularly suitable for fully enclosed U-shaped geothermal wells with a diameter of more than 200mm. The closing valve can be installed as needed, and the number is not limited.

[0039] Method for releasing pressure in geothermal wells: By releasing the heat-conducting medium in the geothermal wells, the pressure is gradually released.

[0040] The closing valve of the utility model can isolate the lower temperature part in the well, reduce the influence of the excessively low temperature part of the geothermal well on heat extraction, and can timely adjust its position in the geothermal well according to the temperature change of the excessively low temperature part in the geothermal well.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the technical solution and conceptual design of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A large-caliber geothermal well closing valve, characterized by: It includes a top pressure plate, a middle pressure plate, an elastic sealing ring and a bottom pressure plate which are arranged coaxially from top to bottom; The top pressure plate is a concave elastic metal disc with multiple radial notches evenly arranged on its body; The middle pressure plate and the bottom pressure plate are both flat metal discs; The elastic sealing ring is a flat high-temperature resistant rubber sealing ring; The middle positions of the top pressure plate, the middle pressure plate, the elastic sealing ring and the bottom pressure plate are all provided with a central hole for the heat transfer medium pipe to pass through; A plurality of studs are symmetrically fixed on the plate body of the bottom pressure plate, and each stud passes through the small hole on the elastic sealing ring, the small hole on the middle pressure plate, and the strip hole on the top pressure plate in turn and is threadedly connected to a nut; when the nut is turned, the top pressure plate is compressed and deformed to clamp the geothermal well wall, and at the same time, the elastic sealing ring is squeezed and deformed by the middle pressure plate and the bottom pressure plate to seal the geothermal well wall and the heat transfer medium pipe.

2. A large-diameter geothermal well closing valve according to claim 1, characterized in that: The initial diameters of the top pressure plate, the middle pressure plate, the elastic sealing ring and the bottom pressure plate are all smaller than the diameter of the geothermal well, and the pressure-bearing diameters of the top pressure plate and the elastic sealing ring are all larger than the diameter of the geothermal well.

3. A large-diameter geothermal well closing valve according to claim 1, characterized in that: The stud is also sleeved with an anti-falling washer, which is located between the nut and the top pressure plate.

4. A large-diameter geothermal well closing valve according to claim 1, characterized in that: The large-diameter geothermal well closing valve further comprises a temperature detection device, which is located above the top pressure plate and is fixed to the middle pressure plate via a column passing through one of the radial notches.

5. A large-diameter geothermal well closing valve according to claim 4, characterized in that: The temperature detection device includes a shell and a microprocessor, a temperature sensor, a power module, and a communication module arranged in the shell. The microprocessor is electrically connected to the temperature sensor, the power module, and the communication module respectively.

6. A large-diameter geothermal well closing valve according to claim 5, characterized in that: The microprocessor adopts the STM32 series, the temperature sensor adopts PT100, the communication module adopts a 4G / 5G communication module, and the power module adopts a sealed battery.

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