Wellhead device of middle-deep layer heat exchange well

Abstract

The utility model relates to the technical field of middle-deep layer heat exchange well mouth devices, in particular to a middle-deep layer heat exchange well mouth device which comprises a waterproof sleeve, a water outlet pipe is arranged at the top end of the waterproof sleeve, one side of the waterproof sleeve is connected with a water inlet pipe, and the other side of the waterproof sleeve is connected with an exhaust pipe. The top end of the waterproof sleeve is connected with the water outlet pipe through a connecting piece, and the bottom end of the waterproof sleeve is connected with a wellhead of a heat exchange well. The connecting piece is a wellhead cover plate, a central pipe joint is nested on the wellhead cover plate in a penetrating manner, a heat exchange well central pipe is arranged in the heat exchange well, the top end of the heat exchange well central pipe is communicated with the bottom end of the water outlet pipe through the central pipe joint, and the bottom end of the heat exchange well central pipe is positioned in the heat exchange well; the wellhead device facilitates installation of the heat exchange well center pipe and maintenance of a heat exchange well system, and reduces the failure rate and heat loss of the middle-deep layer heat exchange well system.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead devices for medium-deep heat exchange wells, in particular to a wellhead device for medium-deep heat exchange wells. Background Art

[0002] Medium-deep heat exchange wells use fluid media to bring heat from geothermal reservoirs to the ground for use. In the prior art, the central tube of the medium-deep heat exchange well is suspended on the wellhead device by a ring and screws. However, the screws will loosen after being fixed for a period of time, resulting in the central tube not being firmly fixed and leaking, causing the cold and hot water to flow, and even the central tube to fall off. In the prior art, the connection between the central tube and the wellhead device is hidden inside the wellhead device, which is not convenient for troubleshooting and maintenance after the above problems occur. At the same time, when hot water enters the outlet, it has more contact with the iron accessories in the existing wellhead device, thereby increasing heat loss.

[0003] Therefore, it is necessary to design a wellhead device for medium-deep heat exchange wells to improve the above problems. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provide a wellhead device for a medium-deep heat exchange well.

[0005] The utility model provides a wellhead device for a medium-deep heat exchange well, comprising a watertight casing, a water outlet pipe is arranged at the top of the watertight casing, a water inlet pipe is connected to one side of the watertight casing, and an exhaust pipe is connected to the other side of the watertight casing;

[0006] The top end of the watertight casing is connected to the water outlet pipe through a connector, and the bottom end of the watertight casing is connected to the wellhead of the heat exchange well;

[0007] The connecting piece is a wellhead cover plate, a central pipe joint is inserted and nested on the wellhead cover plate, a heat exchange well central pipe is arranged in the heat exchange well, the top end of the heat exchange well central pipe is connected with the bottom end of the water outlet pipe through the central pipe joint, and the bottom end of the heat exchange well central pipe is located in the heat exchange well;

[0008] Furthermore, the wellhead cover plate comprises an upper annular plate and a lower annular plate which are arranged in sequence, and the central pipe joint is nested in the middle of the two annular plates.

[0009] Further, the central pipe joint is a cross-shaped structure, an annular protrusion is provided on the central pipe joint, a sealing gasket is provided below the annular protrusion, the lower annular plate is connected to the central pipe joint via the sealing gasket, the lower annular plate is suspended and supported on the central pipe joint, the upper annular plate and the lower annular plate are both provided with screw holes, and the upper annular plate and the lower annular plate are connected to the central pipe joint by screws;

[0010] Furthermore, the wellhead cover plate is provided with a flange, and the two ends of the watertight casing are respectively connected to the wellhead cover plate and the heat exchange well through the flange;

[0011] Furthermore, a temperature gauge, a pressure gauge and a gate are installed on the water inlet pipe and the water outlet pipe respectively;

[0012] Furthermore, a gate is installed on the exhaust pipe;

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

[0014] After the wellhead device of the utility model is applied to the medium-deep heat exchange well system, it can facilitate the installation of the central pipe of the heat exchange well and the maintenance of the heat exchange well system, and reduce the failure rate and heat loss of the medium-deep heat exchange well system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are only used to illustrate and explain the present invention, and are not intended to limit the scope of the present invention, wherein:

[0016] Figure 1 : A schematic diagram of the structure of a wellhead device for a medium-deep heat exchange well according to the utility model;

[0017] In the figure: 1-heat exchange well; 2-center pipe of heat exchange well; 3-watertight casing; 4-water inlet pipe; 5-water outlet pipe; 6-exhaust pipe; 7-flange; 8-center pipe joint; 9-wellhead cover; 10-temperature gauge; 11-pressure gauge; 12-gate. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution, design method and advantages of the utility model clearer, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] like Figure 1 As shown, the utility model provides a wellhead device for a medium-deep heat exchange well, including a watertight casing 3, a water outlet pipe 5 is arranged at the top of the watertight casing 3, a water inlet pipe 4 is connected to one side of the watertight casing 3, and an exhaust pipe 6 is connected to the other side of the watertight casing 3;

[0020] The top end of the watertight casing 3 is connected to the water outlet pipe 5 through a connector, and the bottom end of the watertight casing 3 is connected to the wellhead of the heat exchange well 1;

[0021] The connecting piece is a wellhead cover plate 9, and a central pipe joint 8 is inserted and nested on the wellhead cover plate 9. A heat exchange well central pipe 2 is arranged in the heat exchange well 1. The top end of the heat exchange well central pipe 2 is connected with the bottom end of the water outlet pipe 5 through the central pipe joint 8, and the bottom end of the heat exchange well central pipe 2 is located in the heat exchange well 1;

[0022] It should be noted that the central pipe 2 of the heat exchange well is suspended on the wellhead cover plate 9 at the top of the watertight casing 3 through the central pipe joint 8, which is not easy to fall off, thereby reducing the failure rate of the medium-deep heat exchange well; the outlet pipe 5 is installed on the outside of the heat exchange well 1 through the central pipe joint 8. If there is a water leak in the wellhead device, the leak position can be visually observed to avoid the situation where cold and hot water are connected without knowing it, which is convenient for troubleshooting and maintenance. The hot water is directly connected to the outlet pipe 5 through the central pipe joint 8 of the heat exchange well central pipe 2, and does not directly contact the iron accessories in the wellhead device, thereby reducing heat loss;

[0023] Further, the wellhead cover plate 9 includes an upper annular plate and a lower annular plate which are arranged in sequence, the central pipe joint 8 is nested in the middle of the two annular plates, and the central pipe joint 8 is a cross-shaped structure; an annular protrusion is arranged on the central pipe joint 8, a sealing gasket is arranged below the annular protrusion, the lower annular plate is connected to the central pipe joint 8 via the sealing gasket, and the lower annular plate is suspended and supported on the central pipe joint 8; the lower annular plate is used to suspend and support the central pipe joint 8, and the upper annular plate is used to fix and seal the central pipe joint 8, the upper annular plate and the lower annular plate are both provided with screw holes, and the upper annular plate and the lower annular plate are connected to the central pipe joint 8 by screws;

[0024] It should be noted that the outer diameter of the annular protrusion on the central pipe joint 8 is 40-60 mm larger than the central pipe of the heat exchange well, and a sealing gasket is provided on the lower side of the annular protrusion; the central pipe joint 8 is in a "cross" shape, with an annular protrusion in the middle, the top end of the central pipe joint 8 is connected to the outlet pipe 5, and the bottom end of the central pipe joint 8 is connected to the top end of the central pipe 2 of the heat exchange well; the central pipe joint 8 is nested in the middle of the upper annular plate and the lower annular plate, and the lower annular plate is sealed and connected to the central pipe joint 8 via a sealing gasket, which plays a role in fixing the central pipe 2 of the heat exchange well and sealing the watertight casing 3.

[0025] Furthermore, the wellhead cover plate 9 is provided with a flange 7, and both ends of the watertight casing 3 are respectively connected to the wellhead cover plate 9 and the heat exchange well 1 through the flange 7;

[0026] Furthermore, a temperature gauge 10, a pressure gauge 11 and a gate 12 are installed on the water inlet pipe 4 and the water outlet pipe 5 respectively;

[0027] It should be noted that the water inlet pipe 4 is an important component of the medium-deep heat exchange well system, and is used to transport low-temperature heat-carrying media, such as water, to the underground heat exchange well 1 to absorb geothermal energy in the heat reservoir. A temperature gauge 10, a pressure gauge 11 and a gate 12 are installed on the water inlet pipe 4, and parameters such as the flow rate, pressure and temperature of the medium are considered to ensure that it can meet the operation requirements of the system;

[0028] The outlet pipe 5 is used to transport the heated heat medium from underground to the ground, and then transport it to the indoor radiator or other heat-using equipment through the pipeline to release heat for heating or other thermal energy utilization. The outlet pipe 5 is usually equipped with accessories such as a thermometer 10, a pressure gauge 11 and a gate 12 to monitor the temperature and pressure of the medium in real time and adjust or cut off the flow of the medium when necessary.

[0029] Furthermore, a gate 12 is installed on the exhaust pipe 6; it is used to regulate the emission of gas. The exhaust pipe 6 is used to remove air or other non-condensable gases in the system to prevent them from causing adverse effects on the system, such as reducing thermal efficiency, aggravating corrosion, etc.;

[0030] It is worth mentioning that the wellhead device of the medium-deep heat exchange well has 1) more reliable performance: the central tube 2 of the heat exchange well is suspended on the wellhead cover 9 at the top of the watertight casing 3 through the central tube joint 8, and is not easy to fall off, which reduces the failure rate of the medium-deep heat exchange well; the outlet pipe 5 is installed on the outside of the heat exchange well 1 through the central tube joint 8. If there is a leak in the wellhead device, the leak location can be visually observed to avoid the situation where cold and hot water are connected without knowing it, which is convenient for troubleshooting and maintenance, and 2) reduces heat loss: hot water is directly connected to the outlet pipe 5 through the central tube joint 8 of the central tube 2 of the heat exchange well, and does not directly contact the iron accessories in the wellhead device, reducing heat loss. 3) The structure is simple and easy to use. Before installing the central tube 2 of the heat exchange well, install the watertight casing 3 on the medium-deep heat exchange well. After the installation of the central tube 2 of the heat exchange well is completed, fix the wellhead cover 9 on the watertight casing 3 with screws;

[0031] After the wellhead device of the present application is applied to the medium-deep heat exchange well system, it can facilitate the installation of the central pipe of the heat exchange well and the maintenance of the heat exchange well system, and reduce the failure rate and heat loss of the medium-deep heat exchange well system.

[0032] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A wellhead device for a medium-deep heat exchange well, characterized in that: It comprises a watertight casing (3), a water outlet pipe (5) is arranged at the top of the watertight casing (3), a water inlet pipe (4) is connected to one side of the watertight casing (3), and an exhaust pipe (6) is connected to the other side of the watertight casing (3); The top end of the water-tight casing (3) is connected to the water outlet pipe (5) via a connecting piece, and the bottom end of the water-tight casing (3) is connected to the wellhead of the heat exchange well (1); The connecting piece is a wellhead cover plate (9), a central pipe joint (8) is inserted and nested on the wellhead cover plate (9), a heat exchange well central pipe (2) is arranged in the heat exchange well (1), the top end of the heat exchange well central pipe (2) is connected to the bottom end of the water outlet pipe (5) through the central pipe joint (8), and the bottom end of the heat exchange well central pipe (2) is located in the heat exchange well (1).

2. A wellhead device for a medium-deep heat exchange well according to claim 1, characterized in that: The wellhead cover plate (9) comprises an upper annular plate and a lower annular plate which are arranged in sequence, and the central pipe joint (8) is nested in the middle of the two annular plates.

3. A wellhead device for a medium-deep heat exchange well according to claim 2, characterized in that: The central pipe joint (8) is a cross-shaped structure. An annular protrusion is provided on the central pipe joint (8). A sealing gasket is provided below the annular protrusion. The lower annular plate is connected to the central pipe joint (8) via the sealing gasket. The lower annular plate is suspended and supported on the central pipe joint (8). Screw holes are provided on the upper annular plate and the lower annular plate. The upper annular plate and the lower annular plate are connected to the central pipe joint (8) via screws.

4. The wellhead device for a medium-deep heat exchange well according to claim 1, characterized in that: A flange (7) is provided at the bottom end of the wellhead cover plate (9), and the two ends of the watertight casing (3) are respectively connected to the wellhead cover plate (9) and the heat exchange well (1) through the flange (7).

5. The wellhead device for a medium-deep heat exchange well according to claim 1, characterized in that: The water inlet pipe (4) and the water outlet pipe (5) are respectively installed with a temperature gauge (10), a pressure gauge (11) and a gate (12).

6. The wellhead device for a medium-deep heat exchange well according to claim 1, characterized in that: The exhaust pipe (6) is also provided with a gate (12).

Images