A heat extraction system device for enhancing the external water circulation of the heat extraction pipe in the well with a hollow pump

Abstract

The present invention relates to a heat extraction system device for enhancing the external water circulation of a heat extraction pipe in a hollow pump well, which is applied to heat extraction in a single well with a coaxial casing structure. It consists of a heat extraction inner pipe, a control cable section, a motor section, a liquid discharge pipe section, a hollow pump section, a liquid inlet pipe section, and a heat extraction pipe section. The motor section includes a motor upper cover, a motor housing, a motor lower cover, a motor rotor, a motor stator, and a motor hollow shaft. The liquid discharge pipe section includes a liquid discharge pipe upper flange, a liquid discharge pipe, a liquid discharge pipe lower flange, and an internal spline connecting sleeve. The hollow pump section includes a pump upper flange, a pump shaft, a connecting key, an impeller assembly, a pump housing, and a pump lower flange. The hollow pump is controlled by the motor to work, and the hollow pump lifts the high-temperature geothermal water at the bottom to the liquid discharge pipe section for discharge, forming a local circulation of the geothermal water outside the heat extraction pipe in the wellbore. Carbon dioxide can be used as the internal circulation medium to achieve heat extraction without water extraction. The combination of the hollow pump and the motor realizes the circulating flow of the geothermal water outside the heat extraction pipe in the wellbore, improves the heat exchange efficiency, and causes no environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal energy development, and particularly to a hollow pump enhanced external water circulation geothermal heat extraction system device for the heat extraction pipe in a well. Background Art

[0002] Geothermal resources refer to the geothermal energy, geothermal fluids and their useful components inside the earth that can be economically utilized. It is a renewable energy source with characteristics such as stability, cleanliness, environmental friendliness, and high utilization coefficient. In China, geothermal resources are mainly used directly, and the total utilization amount has ranked first in the world for many consecutive years, bringing a golden development opportunity for the development of the geothermal industry. Vigorously developing geothermal energy is of great significance for adjusting the energy structure and energy conservation and emission reduction. The high-quality and clean development of geothermal energy is of great benefit to China.

[0003] There are many ways to develop and utilize geothermal resources, such as direct use of groundwater, heat pump technology, dry hot rock geothermal utilization, etc. Among them, the deep well heat exchange technology with a coaxial casing structure can indirectly extract the heat of high-temperature groundwater / rock through the closed circulation of the circulating working fluid, realizing "heat extraction without water extraction", which has unique advantages in geothermal energy utilization. However, various factors such as sediments and microbial growth in the underground environment cause pipeline blockage, affecting the fluid flow and heat exchange effect in the pipeline. Moreover, the geothermal water outside the heat extraction pipe in the wellbore has uneven heat at different depths. After heat extraction, the geothermal water near the outer wall of the outer pipe of the heat extraction pipe forms a low-temperature water layer, and the high-temperature geothermal water at the far end outside the pipe cannot contact the outer wall of the heat extraction outer pipe in time, affecting the geothermal heat extraction efficiency. Therefore, it is necessary to design a device to solve problems such as uneven heat of geothermal water in the wellbore, large energy waste during heat extraction, and low heat extraction efficiency. Summary of the Invention

[0004] In order to solve problems such as uneven heat of geothermal water outside the heat extraction pipe in the well, the inability of low-temperature and high-temperature water to form convection in time after heat extraction, and low heat exchange efficiency between the outer pipe and geothermal water, the purpose of this patent is to provide a heat circulation device that can cause local circulation of geothermal water outside the heat extraction pipe, accelerate the contact between the high-temperature geothermal water at the far end of the heat extraction pipe section and the heat extraction pipe, enhance the heat exchange effect of geothermal heat at the heat extraction pipe section, and thus improve the heat utilization rate. The internal heat extraction inner pipe of the device can use carbon dioxide, etc. as the circulating medium, and liquid carbon dioxide vaporizes and absorbs heat in the annular space of the heat extraction section, realizing heat extraction without water extraction and being green and environmentally friendly.

[0005] To achieve the above object, the technical solution adopted in this patent is as follows: A heat extraction system device for enhancing the external water circulation of a heat extraction pipe in a well with a hollow pump, which is composed of a heat extraction inner pipe, a control cable section, a motor section, a drain pipe section, a hollow pump section, a liquid inlet pipe section, and a heat extraction pipe section, including: an injection mandrel, an outer pipe flange, a motor upper cover, a motor rotor, a motor stator, a motor housing, a motor lower cover, a drain pipe upper flange, a motor hollow shaft, an internal spline connecting sleeve, a drain pipe, a drain pipe lower flange, a pump upper flange, a pump shaft, a connecting key, an impeller assembly, a pump housing, a pump lower flange, a liquid inlet pipe upper flange, a liquid inlet outer pipe, a liquid inlet inner pipe, a dispersion head, a liquid inlet pipe lower flange, a heat extraction pipe flange, a heat extraction pipe, a guiding head, a cable fixer, a control cable, a cable seal, an end face seal A, a radial seal A, a connecting bolt group A, a bearing A, a radial seal B, a bearing B, a radial seal C, a radial seal D, a connecting bolt group B, a radial seal E, a radial seal F, a connecting bolt group C, a radial seal G, a flat gasket seal A, a bearing C, a bearing D, a radial seal H, a flat gasket seal B, a flat gasket seal C, a connecting bolt group D, an end face seal B, a connecting bolt group E, and an end face seal C;

[0006] It is characterized in that: the heat extraction inner pipe is composed of an injection mandrel at the bottom with a dispersion head welded thereon. Multiple groups of liquid outlet holes are arranged on the dispersion head, and the heat extraction inner pipe is located inside the heat extraction outer pipe system device;

[0007] The control cable section is composed of an outer pipe flange, a cable fixer, and a control cable. The control cable is fixed outside the outer pipe flange through the cable fixer. The cable seal of the control cable is arranged between the outer pipe flange and the motor upper cover. The outer pipe flange is connected to the lower motor section through a connecting bolt group A;

[0008] The outside of the motor section is composed of a motor upper cover, a motor housing, and a motor lower cover. The motor upper cover is connected to the motor housing through a connecting bolt group A, and the motor lower cover is connected to the motor housing through a connecting bolt group B. An end face seal A is arranged between the motor upper cover and the outer pipe flange, a radial seal B is arranged between the motor upper cover and the motor housing, a radial seal C is arranged between the motor lower cover and the motor housing. Inside the motor section, a motor stator, a motor rotor, and a motor hollow shaft are installed in sequence. A bearing A is installed between the motor upper cover and the motor hollow shaft, a radial seal A is arranged between the motor upper cover and the motor hollow shaft, a bearing B is installed between the motor lower cover and the motor hollow shaft, and a radial seal D is arranged between the motor lower cover and the motor hollow shaft. The lower end of the motor section is the drain pipe section;

[0009] The outer part of the liquid discharge pipe section consists of an upper flange of the liquid discharge pipe, the liquid discharge pipe, and a lower flange of the liquid discharge pipe. One end of the liquid discharge pipe is welded to the lower end face of the upper flange of the liquid discharge pipe, and the other end is welded to the upper end face of the lower flange of the liquid discharge pipe. Multiple groups of liquid discharge holes are provided on the wall of the liquid discharge pipe. The upper flange of the liquid discharge pipe is connected to the lower cover of the motor through a set of connecting bolts B. The inner part of the liquid discharge pipe section includes a hollow shaft of the motor, a pump shaft, and an internal spline connecting sleeve. The hollow shaft of the motor and the pump shaft are connected and fixed through the internal spline connecting sleeve. A radial seal E is provided at the connecting end of the internal spline connecting sleeve and the hollow shaft of the motor, and a radial seal F is provided at the bottom of the connection between the internal spline connecting sleeve and the pump shaft. The lower flange of the liquid discharge pipe is connected to the lower hollow pump section through a set of connecting bolts C;

[0010] The outer part of the hollow pump section consists of an upper flange of the pump, a pump housing, and a lower flange of the pump. The upper flange of the pump is connected to the pump housing through a set of connecting bolts C, and the lower flange of the pump is connected to the pump housing through a set of connecting bolts D. Multiple groups of cylindrical through holes are provided on both the upper flange of the pump and the lower flange of the pump. A flat gasket seal A is provided between the connecting plane of the upper flange of the pump and the pump housing, and a flat gasket seal B is provided between the connecting plane of the lower flange of the pump and the pump housing. A flat gasket seal C and an end face seal B are provided between the lower flange of the pump and the upper flange of the inlet pipe. The inner part of the hollow pump includes a pump shaft, a connecting key, and an impeller assembly. The impeller assembly is installed on the pump shaft through the connecting key. A bearing C is installed between the pump shaft and the upper flange of the pump, and a radial seal G is provided between the pump shaft and the upper flange of the pump. A bearing D is installed between the pump shaft and the lower flange of the pump, and a radial seal H is provided between the pump shaft and the lower flange of the pump. The lower end of the hollow pump section is an inlet pipe section;

[0011] The outer part of the inlet pipe section consists of an upper flange of the inlet pipe, an outer inlet pipe, and a lower flange of the inlet pipe. One end of the outer inlet pipe is welded to the lower end face of the upper flange of the inlet pipe, and the other end is welded to the upper end face of the lower flange of the inlet pipe. One end of the inner inlet pipe inside the inlet pipe section is welded to the lower end face of the upper flange of the inlet pipe, and the other end is welded to the upper end face of the lower flange of the inlet pipe. Multiple groups of cylindrical through holes are provided on both the upper flange of the inlet pipe and the lower flange of the inlet pipe. An end face seal C is provided between the connecting surface of the lower flange of the inlet pipe and the flange of the heat extraction pipe. The upper flange of the inlet pipe is connected to the lower flange of the pump through a set of connecting bolts D, and the lower flange of the inlet pipe is connected to the flange of the heat extraction pipe through a set of connecting bolts E;

[0012] The heat extraction pipe section consists of a flange of the heat extraction pipe, a heat extraction pipe, and a guide head. One end of the heat extraction pipe is welded to the lower end face of the flange of the heat extraction pipe, and the other end is welded to the guide head. A spherical guide surface is provided at the front end of the guide head. Multiple groups of cylindrical through holes are provided on the flange of the heat extraction pipe. Description of the Drawings

[0013] Figure 1 It is the overall two-dimensional plane front view cross-sectional view of this patent;

[0014] Figure 2 It is the two-dimensional plane front view cross-sectional view of the heat extraction inner pipe of this patent;

[0015] Figure 3 This is the front elevation cross-sectional view of the two-dimensional plane of the control cable section of this patent;

[0016] Figure 4 This is the front elevation cross-sectional view of the two-dimensional plane of the motor section of this patent;

[0017] Figure 5 This is the front elevation cross-sectional view of the two-dimensional plane of the drain pipe section of this patent;

[0018] Figure 6 This is the front elevation cross-sectional view of the two-dimensional plane of the hollow pump section of this patent;

[0019] Figure 7 This is the front elevation cross-sectional view of the two-dimensional plane of the inlet pipe section of this patent;

[0020] Figure 8 This is the front elevation cross-sectional view of the two-dimensional plane of the heat extraction pipe section of this patent;

[0021] Figure 1 In the figure: 1 - injection mandrel; 2 - outer pipe flange; 3 - motor upper cover; 4 - motor rotor; 5 - motor stator; 6 - motor housing; 7 - motor lower cover; 8 - drain pipe upper flange; 9 - motor hollow shaft; 10 - internal spline connecting sleeve; 11 - drain pipe; 12 - drain pipe lower flange; 13 - pump upper flange; 14 - pump shaft; 15 - connecting key; 16 - impeller assembly; 17 - pump housing; 18 - pump lower flange; 19 - inlet pipe upper flange; 20 - inlet outer pipe; 21 - inlet inner pipe; 22 - dispersion head; 23 - inlet pipe lower flange; 24 - heat extraction pipe flange; 25 - heat extraction pipe; 26 - guiding head; 27 - cable fixator; 28 - control cable; 29 - cable seal; 30 - end face seal A; 31 - radial seal A; 32 - connecting bolt group A; 33 - bearing A; 34 - radial seal B; 35 - bearing B; 36 - radial seal C; 37 - radial seal D; 38 - connecting bolt group B; 39 - radial seal E; 40 - radial seal F; 41 - connecting bolt group C; 42 - radial seal G; 43 - flat gasket seal A; 44 - bearing C; 45 - bearing D; 46 - radial seal H; 47 - flat gasket seal B; 48 - flat gasket seal C; 49 - connecting bolt group D; 50 - end face seal B; 51 - connecting bolt group E; 52 - end face seal C; Detailed implementation manners

[0022] The overall schematic diagram of the specific structure of this patent is as shown in Figure 1As shown in the figure, it includes: injection mandrel 1, outer pipe flange 2, motor upper cover 3, motor rotor 4, motor stator 5, motor housing 6, motor lower cover 7, upper flange of drain pipe 8, hollow motor shaft 9, internal spline connecting sleeve 10, drain pipe 11, lower flange of drain pipe 12, upper flange of pump 13, pump shaft 14, connecting key 15, impeller assembly 16, pump housing 17, lower flange of pump 18, upper flange of inlet pipe 19, outer inlet pipe 20, inner inlet pipe 21, dispersion head 22, lower flange of inlet pipe 23, heat extraction pipe flange 24, heat extraction pipe 25, guide head 26, cable fixator 27, control cable 28, cable seal 29, end face seal A 30, radial seal A 31, connecting bolt group A 32, bearing A 33, radial seal B 34, bearing B 35, radial seal C 36, radial seal D 37, connecting bolt group B 38, radial seal E 39, radial seal F 40, connecting bolt group C 41, radial seal G 42, flat gasket seal A 43, bearing C 44, bearing D 45, radial seal H 46, flat gasket seal B 47, flat gasket seal C 48, connecting bolt group D 49, end face seal B 50, connecting bolt group E 51, end face seal C 52;

[0023] Refer to Figure 1 , Figure 2 ; The bottom of the injection mandrel 1 is welded with a dispersion head 22 to form a heat extraction inner pipe. Multiple groups of liquid outlet holes are arranged on the dispersion head 22. The heat extraction inner pipe is located inside the heat extraction outer pipe system device. Liquid carbon dioxide is injected from the port of the injection mandrel 1 and then sprayed out through the liquid outlet holes in the dispersion head 22 into the annular space inside the coaxial sleeve;

[0024] Refer to Figure 1 , Figure 3 ; The control cable section is composed of an outer pipe flange 2, a cable fixator 27, and a control cable 28. The control cable 28 is fixed outside the outer pipe flange 2 through the cable fixator 27. The cable seal 29 of the control cable 28 is arranged between the outer pipe flange 2 and the motor upper cover 3 to ensure the normal operation of the control cable 28, and then the motor section below is controlled through the control cable 28. The outer pipe flange 2 is connected to the motor section through the connecting bolt group A 32;

[0025] Refer to Figure 1 , Figure 4; The exterior of the motor section is composed of the motor upper cover 3, the motor housing 6, and the motor lower cover 7. The motor upper cover 3 is connected to the motor housing 6 through the connecting bolt group A 32, and the motor lower cover 7 is connected to the motor housing 6 through the connecting bolt group B 38 to form a complete motor housing. An end face seal A 30 is provided in the connection plane between the motor upper cover 3 and the outer pipe flange 2 to ensure that the carbon dioxide in the annular space does not leak from this end face. A radial seal B 34 is provided between the motor upper cover 3 and the motor housing 6 to prevent the geothermal water outside the heat extraction outer pipe from entering the interior of the motor through the gap between the motor housing 6 and the motor upper cover 3. A radial seal C 36 is provided between the motor lower cover 7 and the motor housing 6 to prevent the geothermal water outside the heat extraction outer pipe from entering the interior of the motor through the gap between the motor housing 6 and the motor lower cover 7. Inside the motor section, the motor stator 5, the motor rotor 4, and the motor hollow shaft 9 are installed in sequence. The bearing A 33 is installed between the motor upper cover 3 and the motor hollow shaft 9. A radial seal A 31 is provided between the motor upper cover 3 and the motor hollow shaft 9 to prevent the carbon dioxide in the annular space from entering the interior of the motor through the gap between the motor hollow shaft 9 and the motor upper cover 3. The bearing B 35 is installed between the motor lower cover 7 and the motor hollow shaft 9 and forms a pair of matching bearings with the bearing A 33. A radial seal D 37 is provided between the motor lower cover 7 and the motor hollow shaft 9 to prevent the geothermal water from entering the interior of the motor through the gap between the motor hollow shaft 9 and the motor lower cover 7. Inside the motor section, the motor rotor 4 rotates to drive the motor hollow shaft 9 to rotate;

[0026] Refer to Figure 1 , Figure 5; The exterior of the drain pipe section consists of the upper flange 8 of the drain pipe, the drain pipe 11, and the lower flange 12 of the drain pipe. One end of the drain pipe 11 is welded to the lower end face of the upper flange 8 of the drain pipe, and the other end is welded to the upper end face of the lower flange 12 of the drain pipe to form the outer wall of the drain pipe section. Multiple drain holes are provided on the outer wall of the drain pipe 11. The upper flange 8 of the drain pipe is connected to the lower cover 7 of the motor through the connecting bolt group B 38, and the lower flange 12 of the drain pipe is connected to the upper flange 13 of the pump through the connecting bolt group C 41 to connect the three sections of the motor section, the drain pipe section, and the hollow pump section. The pump shaft 14 inside the drain pipe section is connected and fixed to the hollow shaft 9 of the motor through the internal spline connecting sleeve 10. When the motor starts, the hollow shaft 9 of the motor drives the pump shaft 14 to rotate in this section. The radial seal E 39 is arranged at the connecting end of the internal spline connecting sleeve 10 and the hollow shaft 9 of the motor to prevent the geothermal water in the inner cavity of the drain pipe section from entering the annular space through the connecting gap between the internal spline connecting sleeve 10 and the hollow shaft 9 of the motor, and the carbon dioxide in the annular space will not leak into the inner cavity of the drain pipe section through the connecting gap between the internal spline connecting sleeve 10 and the hollow shaft 9 of the motor. The radial seal F 40 is arranged at the bottom of the connection between the internal spline connecting sleeve 10 and the pump shaft 14 to prevent the geothermal water in the inner cavity of the drain pipe section from entering the annular space through the connecting gap between the internal spline connecting sleeve 10 and the pump shaft 14, and the carbon dioxide in the annular space will not leak into the inner cavity of the drain pipe section through the connecting gap between the internal spline connecting sleeve 10 and the pump shaft 14;

[0027] Refer to Figure 1 , Figure 6; The outside of the hollow pump section is composed of the upper pump flange 13, the pump housing 17, and the lower pump flange 18. The upper pump flange 13 is connected to the pump housing 17 through the connecting bolt group C 41, and the lower pump flange 18 is connected to the pump housing 17 through the connecting bolt group D 49 to form a hollow pump body. Both the upper pump flange 13 and the lower pump flange 18 are provided with through holes, and the through holes are connected to the inner cavity of the hollow pump to form a closed flow channel for geothermal water. A flat gasket seal A 43 is arranged in the connecting plane between the upper pump flange 13 and the pump housing 17, which can prevent geothermal water from leaking through the gap between the upper pump flange 13 and the pump housing 17. A flat gasket seal B 47 is arranged between the connecting plane of the lower pump flange 18 and the pump housing 17. After sealing, geothermal water will not leak from the gap between the lower pump flange 18 and the pump housing 17. A flat gasket seal C 48 and an end face seal B 50 are arranged in the connecting surface between the lower pump flange 18 and the upper flange 19 of the liquid inlet pipe. After sealing, the geothermal water pumped up by the hollow pump will only enter the inner cavity along the closed flow channel and will not leak through the gap between the lower pump flange 18 and the upper flange 19 of the liquid inlet pipe. At the same time, it also prevents carbon dioxide in the annular space and geothermal water outside the heat extraction outer pipe from entering the hollow pump. The inside of the hollow pump includes a pump shaft 14, an impeller assembly 16, and a connecting key 15. The impeller assembly 16 is installed on the pump shaft 14 through the connecting key 15. A bearing C 44 is installed between the pump shaft 14 and the upper pump flange 13. A radial seal G 42 is arranged between the pump shaft 14 and the upper pump flange 13 to prevent the geothermal water that has been pumped up from re-entering the hollow pump through the gap between the upper pump flange 13 and the pump shaft 14. A bearing D 45 is installed between the pump shaft 14 and the lower pump flange 18 and forms a pair of matching bearings with the bearing C 44. The bearing C 44 and the bearing D 45 are made of materials suitable for aqueous solutions to ensure normal operation in the environment of this hollow pump. A radial seal H 46 is arranged between the pump shaft 14 and the lower pump flange 18. After sealing, carbon dioxide in the annular space will not enter the hollow pump through the gap between the lower pump flange 18 and the pump shaft 14;

[0028] Refer to Figure 1 , Figure 7; The liquid inlet pipe section includes the upper flange 19 of the liquid inlet pipe, the outer liquid inlet pipe 20, the inner liquid inlet pipe 21, and the lower flange 23 of the liquid inlet pipe. One end of the outer liquid inlet pipe 20 is welded to the lower end face of the upper flange 19 of the liquid inlet pipe, and the other end is welded to the upper end face of the lower flange 23 of the liquid inlet pipe to form the outer wall of the liquid inlet section. One end of the inner liquid inlet pipe 21 is welded to the lower end face of the upper flange 19 of the liquid inlet pipe, and the other end is welded to the upper end face of the lower flange 23 of the liquid inlet pipe to form the inner wall of the liquid inlet section. Through holes are provided on both the upper flange 19 of the liquid inlet pipe and the lower flange 23 of the liquid inlet pipe. The through holes and the inner cavity of the liquid inlet pipe section form a closed flow channel. The upper flange 19 of the liquid inlet pipe is connected to the lower flange 18 of the pump through the connecting bolt group D 49. The lower flange 23 of the liquid inlet pipe is connected to the heat extraction pipe flange 24 through the connecting bolt group E 51, connecting the three sections of the hollow pump section, the liquid inlet pipe section, and the heat extraction pipe section. A face seal C 52 is provided between the lower flange 23 of the liquid inlet pipe and the heat extraction pipe flange 24 to prevent carbon dioxide in the annular space from leaking through the gap between the lower flange 23 of the liquid inlet pipe and the heat extraction pipe flange 24;

[0029] Refer to Figure 1 , Figure 8 ; The heat extraction pipe section consists of the heat extraction pipe flange 24, the heat extraction pipe 25, and the guide head 26. One end of the heat extraction pipe 25 is welded to the lower end face of the heat extraction pipe flange 24, and the other end is welded to the guide head 26. A spherical guide surface is provided at the front end of the guide head 26 for guiding in the well;

[0030] During operation, the control cable 28 controls the rotation of the motor rotor 4 in the motor section. The motor rotor 4 then drives the rotation of the motor hollow shaft 9. In the drain pipe section, the motor hollow shaft 9 further drives the rotation of the pump shaft 14, realizing the control of the hollow pump's operation outside the well by the motor. When the hollow pump is operating, the high-temperature geothermal water at the bottom is pumped up and exchanges heat with the low-temperature heat extraction medium in the annular space at the heat extraction pipe 25. The heat-exchanged low-temperature geothermal water enters the closed flow channel composed of the inner liquid inlet pipe 21 and the outer liquid inlet pipe 20 through the through hole of the heat extraction pipe flange 24, and then is pumped to the drain pipe section through the closed flow channel composed of the through hole of the lower flange 18 of the pump, the through hole of the upper flange 13 of the pump, and the inner cavity of the hollow pump, and then discharged back into the well through the through hole of the drain pipe 11, forming a local external circulation of the geothermal water outside the heat extraction pipe. The low-temperature heat extraction medium, liquid carbon dioxide, enters from the inlet of the injection mandrel 1 and enters the annular space through multiple liquid outlet holes in the dispersion head 22, exchanges heat with the high-temperature geothermal water outside the heat extraction pipe 25, vaporizes after absorbing heat and rises to the wellhead for heat recovery and utilization. After heat utilization, it is cooled and liquefied and then injected into the well again to form an internal heat extraction cycle.

Claims

1. A heat extraction system device for enhancing the external water circulation of a heat extraction pipe in a well with a hollow pump, which is composed of a heat extraction inner pipe, a control cable section, a motor section, a liquid discharge pipe section, a hollow pump section, a liquid inlet pipe section, and a heat extraction pipe section, including: Injection mandrel (1), outer pipe flange (2), motor upper cover (3), motor rotor (4), motor stator (5), motor housing (6), motor lower cover (7), upper flange of drain pipe (8), hollow motor shaft (9), internal spline coupling sleeve (10), drain pipe (11), lower flange of drain pipe (12), upper flange of pump (13), pump shaft (14), connecting key (15), impeller assembly (16), pump housing (17), lower flange of pump (18), upper flange of inlet pipe (19), outer inlet pipe (20), inner inlet pipe (21), dispersion head (22), lower flange of inlet pipe (23), heat extraction pipe flange (24), heat extraction pipe (25), guiding head (26), cable fixator (27), control cable (28), cable seal (29), end face seal A (30), radial seal A (31), connecting bolt group A (32), bearing A (33), radial seal B (34), bearing B (35), radial seal C (36), radial seal D (37), connecting bolt group B (38), radial seal E (39), radial seal F (40), connecting bolt group C (41), radial seal G (42), flat gasket seal A (43), bearing C (44), bearing D (45), radial seal H (46), flat gasket seal B (47), flat gasket seal C (48), connecting bolt group D (49), end face seal B (50), connecting bolt group E (51), end face seal C (52); It is characterized in that: the heat extraction inner pipe is composed of a dispersion head (22) arranged at the bottom of the injection mandrel (1) by welding, multiple groups of liquid outlet holes are arranged on the dispersion head (22), and the heat extraction inner pipe is located inside the heat extraction outer pipe system device; The control cable section includes an outer pipe flange (2), a cable fixator (27), and a control cable (28). The control cable (28) is fixed outside the outer pipe flange (2) through the cable fixator (27). The cable seal (29) of the control cable (28) is arranged inside the outer pipe flange (2) and the motor upper cover (3). The outer pipe flange (2) is connected to the lower motor section through a connecting bolt group A (32); The exterior of the motor section consists of a motor upper cover (3), a motor housing (6), and a motor lower cover (7). The motor upper cover (3) is connected to the motor housing (6) by a set of connecting bolts A (32), and the motor lower cover (7) is connected to the motor housing (6) by a set of connecting bolts B (38). An end face seal A (30) is provided between the motor upper cover (3) and the outer pipe flange (2), a radial seal B (34) is provided between the motor upper cover (3) and the motor housing (6), and a radial seal C (36) is provided between the motor lower cover (7) and the motor housing (6). Inside the motor section, a motor stator (5), a motor rotor (4), and a motor hollow shaft (9) are installed in sequence. A bearing A (33) is installed between the motor upper cover (3) and the motor hollow shaft (9), and a radial seal A (31) is provided between the motor upper cover (3) and the motor hollow shaft (9). A bearing B (35) is installed between the motor lower cover (7) and the motor hollow shaft (9), and a radial seal D (37) is provided between the motor lower cover (7) and the motor hollow shaft (9). The lower end of the motor section is a drain pipe section; The exterior of the drain pipe section consists of a drain pipe upper flange (8), a drain pipe (11), and a drain pipe lower flange (12). One end of the drain pipe (11) is welded to the lower end face of the drain pipe upper flange (8), and the other end is welded to the upper end face of the drain pipe lower flange (12). Multiple sets of drain holes are provided on the wall of the drain pipe (11). The drain pipe upper flange (8) is connected to the motor lower cover (7) by a set of connecting bolts B (38). The interior of the drain pipe section includes a motor hollow shaft (9), a pump shaft (14), and an internal spline connecting sleeve (10). The motor hollow shaft (9) and the pump shaft (14) are connected and fixed by the internal spline connecting sleeve (10). A radial seal E (39) is provided at the connecting end of the internal spline connecting sleeve (10) and the motor hollow shaft (9), and a radial seal F (40) is provided at the connecting bottom of the internal spline connecting sleeve (10) and the pump shaft (14). The drain pipe lower flange (12) is connected to the lower hollow pump section by a set of connecting bolts C (41); The outer part of the hollow pump section consists of an upper pump flange (13), a pump housing (17), and a lower pump flange (18). The upper pump flange (13) is connected to the pump housing (17) through a set of connecting bolts C (41), and the lower pump flange (18) is connected to the pump housing (17) through a set of connecting bolts D (49). Both the upper pump flange (13) and the lower pump flange (18) are provided with multiple groups of cylindrical through holes. A flat gasket seal A (43) is arranged between the connecting plane of the upper pump flange (13) and the pump housing (17), and a flat gasket seal B (47) is arranged between the connecting plane of the lower pump flange (18) and the pump housing (17). A flat gasket seal C (48) and an end face seal B (50) are arranged between the lower pump flange (18) and the upper flange of the liquid inlet pipe (19). The inside of the hollow pump includes a pump shaft (14), a connecting key (15), and an impeller assembly (16). The impeller assembly (16) is installed on the pump shaft (14) through the connecting key (15). A bearing C (44) is installed between the pump shaft (14) and the upper pump flange (13), and a radial seal G (42) is arranged between the pump shaft (14) and the upper pump flange (13). A bearing D (45) is installed between the pump shaft (14) and the lower pump flange (18), and a radial seal H (46) is arranged between the pump shaft (14) and the lower pump flange (18). The lower end of the hollow pump section is a liquid inlet pipe section; The outer part of the said liquid inlet pipe section consists of an upper flange of the liquid inlet pipe (19), an outer liquid inlet pipe (20), and a lower flange of the liquid inlet pipe (23). One end of the outer liquid inlet pipe (20) is welded to the lower end face of the upper flange of the liquid inlet pipe (19), and the other end is welded to the upper end face of the lower flange of the liquid inlet pipe (23). One end of the inner liquid inlet pipe (21) inside the liquid inlet pipe section is welded to the lower end face of the upper flange of the liquid inlet pipe (19), and the other end is welded to the upper end face of the lower flange of the liquid inlet pipe (23). Both the upper flange of the liquid inlet pipe (19) and the lower flange of the liquid inlet pipe (23) are provided with multiple groups of cylindrical through holes. An end face seal C (52) is arranged on the connecting surface between the lower flange of the liquid inlet pipe (23) and the flange of the heat extraction pipe (24). The upper flange of the liquid inlet pipe (19) is connected to the lower pump flange (18) through a set of connecting bolts D (49), and the lower flange of the liquid inlet pipe (23) is connected to the flange of the heat extraction pipe (24) through a set of connecting bolts E (51); The said heat extraction pipe section consists of a flange of the heat extraction pipe (24), a heat extraction pipe (25), and a guide head (26). One end of the heat extraction pipe (25) is welded to the lower end face of the flange of the heat extraction pipe (24), and the other end is welded to the guide head (26). The front end of the guide head (26) is provided with a spherical guide surface. The flange of the heat extraction pipe (24) is provided with multiple groups of cylindrical through holes.

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