Four-way pressing and plugging pipe fitting of ground source heat pump

Abstract

The utility model discloses a ground source heat pump four-way pressurizing and plugging pipe fitting, which relates to the technical field of terrestrial heat and comprises a shell, a connecting component, a pressure measuring component, a plugging component and a pressurizing component. One end of the shell is connected with the connecting assembly, and the other end is provided with an injection channel; the plugging assembly is arranged at the end, away from the connecting assembly, of the shell and used for controlling opening and closing of the inner end of the injection channel. The connecting assembly is of a four-way structure and used for being communicated with the double-U-shaped buried pipes. The single pressure test device can be connected with the double-U-shaped buried pipe for pressure test, repeated operation is not needed, operation steps can be greatly reduced, and operation efficiency is improved. The end of the double-U-shaped buried pipe can be conveniently connected with the connecting pipe in a sealed mode, and therefore the buried pipe has the technical advantages that assembling and disassembling are convenient and fast, the hot melting frequency of the buried pipe is reduced, the hot melting position is effectively prevented from being broken, and pressure relief accidents are avoided.

Description

Technical Field

[0001] This utility model relates to the field of geothermal technology, specifically to a four-way pressure sealing pipe fitting for a ground source heat pump. Background Technology

[0002] A ground source heat pump, also known as a geothermal heat pump, is a system that uses geothermal energy for air conditioning and hot water supply. Geothermal energy includes soil, surface water, and groundwater, and it mainly utilizes the stable temperature in the underground soil for heat exchange, thereby achieving functions such as heating, cooling, and hot water supply.

[0003] Before being installed in pump wells or trenches, buried pipes need to undergo a pressure test for quality inspection. The pressure test requires holding the buried pipe under pressure for at least one hour. Traditional techniques mostly use pressure testing products designed for single U-shaped buried pipes, then use two of these products to test double U-shaped buried pipes. This process is cumbersome and reduces work efficiency. Summary of the Invention

[0004] In order to overcome the problem of "lack of pressure testing products for double U-shaped buried pipes, resulting in cumbersome testing operations and reduced work efficiency" in the above-mentioned background technology, this utility model provides a four-way pressure sealing pipe fitting for ground source heat pumps.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a four-way pressure-sealing pipe fitting for a ground source heat pump, including a shell, a connecting component, a pressure measuring component, a sealing component, and a pressurizing component; one end of the shell is connected to the connecting component, and the other end is provided with an injection channel; the sealing component is located at the end of the shell away from the connecting component and is used to control the opening and closing of the inner end of the injection channel; the pressurizing component is detachably connected to the outer end of the injection channel; the pressure measuring component is located on the side wall of the shell; the connecting component is a four-way structure for connecting a double U-shaped buried pipe.

[0006] As a further optimization of this utility model, the housing includes a straight cylindrical portion, an expansion portion, a first sealing plate, and a second sealing plate; the straight cylindrical portion and the expansion portion are coaxially arranged and their ends are sealed to each other; the inner cavity of the straight cylindrical portion and the inner cavity of the expansion portion are in communication with each other; the first sealing plate is disposed at the end of the straight cylindrical portion away from the expansion portion; the second sealing plate is disposed at the end of the expansion portion away from the straight cylindrical portion; the injection channel is disposed inside the first sealing plate, and the sealing assembly is connected to the first sealing plate.

[0007] As a further optimization of this utility model, the four-way structure includes four connecting pipes that are inserted into the second sealing plate.

[0008] As a further optimization of this utility model, the connecting pipes are arranged in parallel to each other; the inner cavity of the connecting pipe is in communication with the inner cavity of the shell.

[0009] As a further optimization of this utility model, the injection channel is arranged in an L-shape.

[0010] As a further optimization of this utility model, the sealing assembly includes a bolt, a nut, and a first sealing ring for sealing the inner end of the injection channel; the bolt includes a stud and a bolt that is perpendicularly and fixedly connected to the stud; the first sealing plate has an insertion hole, and the bolt is inserted into the insertion hole; the first sealing ring is sleeved on the outer surface of the bolt and pressed against the stud, the stud is located at the end of the inner cavity of the housing away from the connecting assembly, and the nut is located at the outer end face of the first sealing plate.

[0011] As a further optimization of this utility model, the first sealing ring is disposed between the column head and the first sealing plate.

[0012] As a further optimization of this utility model, the projection of the first sealing ring on the inner wall of the first sealing plate is the first projection, and the inner end of the injection channel is located within the first projection range.

[0013] As a further optimization of this utility model, the cross-section of the inner cavity of the straight cylinder is hexagonal, the inner wall of the straight cylinder is adapted to and clearance fits the outer wall of the column head; the inner wall of the straight cylinder is provided with a flow channel.

[0014] As a further optimization of this utility model, the pressure measuring component includes an extension tube and a pressure gauge; the pressure gauge is fixedly connected to the outer end of the extension tube, and the extension tube is inserted into the straight cylinder; the inner end of the extension tube is provided with an inner extension, which is used to abut against the column head to prevent the bolt from coming out of the insertion hole.

[0015] In summary, this utility model has at least one of the following advantages:

[0016] (1) A single utility model can be connected to a double U-shaped underground pipe and pressure tested without repeated operation, which can greatly reduce operation steps and improve work efficiency.

[0017] (2) The double U-shaped underground pipe can be conveniently sealed and connected to the connecting pipe, thus giving the underground pipe the technical advantages of convenient loading and unloading, reducing the number of times the underground pipe is hot-melted, effectively preventing the breakage at the hot-melt position, and avoiding pressure relief accidents.

[0018] (3) The sealing component can simultaneously control the opening and closing states of the injection channel and the exhaust port. It has a simple structure, low cost and small size.

[0019] (4) The inner wall of the straight section is provided with a flow channel, which is concave. When the fluid flows through the flow channel, it can bypass the column head and the first sealing ring, thereby avoiding the problem of sudden reduction in flow velocity, shortening the overall time of the pressure test, and improving work efficiency.

[0020] (5) The inner end of the extension tube is provided with an inner extension part. The inner extension part is set in an inward protrusion shape based on the inner wall of the straight cylinder part. The inner extension part is used to abut the column head to prevent the bolt from coming out of the insertion hole, that is, to prevent the bolt from falling into the inner cavity of the shell.

[0021] (6) Since the pressure holding time is usually more than one hour, after the pressure holding of the underground pipe at this construction node is completed, the user can remove the pressure boosting component and then transfer the pressure boosting component to other construction nodes for pressure boosting of their underground pipes. Attached Figure Description

[0022] The present application will be further explained below with reference to the accompanying drawings:

[0023] Figure 1 This is a front view of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0025] Figure 3 A front view structural diagram of the sealing component;

[0026] Figure 4 This is a schematic diagram of the injection channel structure;

[0027] Figure 5 This is a schematic diagram of the cross-sectional top view of the flow channel;

[0028] Figure 6 This is a schematic diagram of the position of the inner extension and the front view of the structural elevation section;

[0029] Figure 7 This is a schematic diagram showing the height position of the inner extension.

[0030] Explanation of reference numerals in the attached figures:

[0031] In the picture,

[0032] 1. Shell; 11. Straight cylindrical section; 1101. First cylindrical body; 1102. Second cylindrical body; 1103. Second sealing ring; 111. Flow channel; 12. Expansion section; 13. First sealing plate; 131. Insertion hole; 132. Injection channel; 1321. Outer end; 1322. Inner end; 133. Exhaust hole; 14. Second sealing plate;

[0033] 2. Connecting components; 21. Connecting pipes;

[0034] 3. Pressure measuring assembly; 31. Extension tube; 311. Inner extension; 32. Pressure gauge;

[0035] 4. Sealing assembly; 41. Bolt; 411. Column head; 42. Nut; 43. First sealing ring;

[0036] 5. Buried pipes. Detailed Implementation

[0037] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0038] Reference Figure 1 This embodiment provides a four-way pressure-sealing fitting for a ground source heat pump, including a housing 1, a connecting assembly 2, a pressure measuring assembly 3, a sealing assembly 4, and a pressurizing assembly. The housing 1 provides structural support; the connecting assembly 2 connects the fitting to the buried pipe 5; the pressure measuring assembly 3 detects the pressure inside the housing 1, which is the pressure inside the buried pipe 5; the sealing assembly 4 maintains pressure inside the housing 1, which is the pressure inside the buried pipe 5; and the pressurizing assembly injects fluid (e.g., gas, liquid, or a gas-liquid mixture) into the housing 1 and the buried pipe 5, thereby increasing the pressure inside the housing 1 and the buried pipe 5.

[0039] Reference Figure 1 and Figure 3 One end of the housing 1 is connected to the connecting assembly 2, and the other end is provided with an injection channel 132. The pressurization assembly injects fluid into the inner cavity of the housing 1 through the injection channel 132.

[0040] Reference Figure 1 and Figure 4 The sealing component 4 is located at the end of the housing 1 away from the connecting component 2 and is used to control the opening and closing of the inner end 1322 (i.e., the inner end) of the injection channel 132; the pressurizing component is detachably connected to the outer end 1321 of the injection channel 132. The pressurizing component includes a pump body (e.g., an air pump or a liquid pump) and a pipe body. One end of the pipe body is connected and communicates with the pump body, and the other end is detachably connected to the outer end 1321 (i.e., the outer end) of the injection channel 132 via a quick-connect fitting. An extension tube is fixedly installed at the outer end 1321 of the inner cavity of the injection channel 132. One end of the extension tube is fixedly installed in the injection channel 132 via threads and a sealing ring, and the other end extends from the outer edge of the first sealing plate 13; the outer surface of the extension tube is provided with annular fins (e.g., through an integral fixed connection). The quick-connect fitting is sleeved with the extension tube and detachably snapped into the annular fins (e.g., through a rotary snap-fit ​​or a spring snap-fit, both of which are conventional existing technologies in the industry and will not be described in detail here). The outer surface of the end of the extension tube is sealed and fixed to the inner wall of the injection channel 132 through threads and a sealing ring.

[0041] Reference Figure 1The pressure measuring component 3 is located on the side wall of the housing 1.

[0042] Reference Figure 1 and Figure 2 The connecting assembly 2 is a four-way structure for connecting the double-U-shaped underground pipe 5. The four-way structure includes four connecting pipes 21 that are inserted into the second sealing plate 14. The outer wall of the connecting pipe 21 is sealed to the second sealing plate 14 (e.g., by welding or sealing with a sealing ring). The connecting pipes 21 are arranged parallel to each other; the inner cavity of the connecting pipe 21 is in communication with the inner cavity of the housing 1. Before installation into the heat pump well, the double-U-shaped underground pipe 5 consists of two unassembled U-shaped pipes. The ends of the two U-shaped pipes can be easily sealed to the connecting pipes 21 (e.g., by heat fusion), thus providing technical advantages such as convenient installation and removal, reduced heat fusion times for the underground pipe 5, effective prevention of breakage at the heat fusion location, and avoidance of pressure leakage accidents.

[0043] Reference Figure 1 and Figure 3 The housing 1 includes a straight cylindrical portion 11, an expansion portion 12, a first sealing plate 13, and a second sealing plate 14. The straight cylindrical portion 11 and the expansion portion 12 are coaxially arranged and their ends are sealed to each other (e.g., by welding, integral fixing, or by a flange and sealing ring). The inner cavity of the straight cylindrical portion 11 is in communication with the inner cavity of the expansion portion 12. The first sealing plate 13 is located at the end of the straight cylindrical portion 11 away from the expansion portion 12, and its outer edge is sealed to the end of the side wall of the straight cylindrical portion 11 (e.g., by welding, integral fixing, or by a flange and sealing ring). The second sealing plate 14 is located at the end of the expansion portion 12 away from the straight cylindrical portion 11, and its outer edge is sealed to the end of the side wall of the expansion portion 12 (e.g., by welding, integral fixing, or by a flange and sealing ring). An injection channel 132 is located inside the first sealing plate 13, and a sealing assembly 4 is connected to the first sealing plate 13.

[0044] Reference Figure 3 and Figure 4 The injection channel 132 is arranged in an L-shape, so that the inner end 1322 of the injection channel 132 is located on the inner end face of the first sealing plate 13 and the outer end 1321 is located on the outer side wall of the first sealing plate 13, which further facilitates the installation and removal of the sealing component 4 and the pressurizing component.

[0045] Reference Figure 1 and Figure 3The sealing assembly 4 includes a bolt 41, a nut 42, and a first sealing ring 43 for sealing the inner end 1322 of the injection channel 132. The bolt 41 includes a stud head 411 and a stud that is vertically and fixedly connected to the stud head 411 (through an integral fixed connection). The first sealing plate 13 is provided with an insertion hole 131, which is coaxially arranged with the straight cylindrical part 11. The stud is inserted into the insertion hole 131. The first sealing ring 43 is sleeved on the outer surface of the stud and pressed against the stud head 411. The stud head 411 is located at the end of the inner cavity of the housing 1 away from the connecting assembly 2. The nut 42 is located at the outer end face of the first sealing plate 13. When a user tightens nut 42, the column head 411 pushes the first sealing ring 43 to press against the inner end face of the first sealing plate 13 to block the injection channel 132, thereby maintaining pressure in the inner cavity of the housing 1 and the inner cavity of the buried pipe 5. When a user loosens nut 42, the fluid from the pressurization component can flow into the inner cavity of the housing 1 and the inner cavity of the buried pipe 5 through the injection channel 132, thus simulating the pressure environment of the buried pipe 5.

[0046] Reference Figure 3 The first sealing ring 43 is disposed between the stud 411 and the first sealing plate 13. When the stud 411 and the nut 42 approach each other, they can squeeze the first sealing plate 13 from both sides, thereby sealing the injection channel 132 and the gap between the stud and the insertion hole 131, thus achieving pressure holding.

[0047] Reference Figure 3 The vertical projection of the first sealing ring 43 on the inner wall of the first sealing plate 13 is the first projection, and the inner end 1322 of the injection channel 132 is set within the range of the first projection. The stud is set perpendicular to the first sealing plate 13, so that after the first sealing ring 43 presses against the first sealing plate 13, it can completely cover the inner end 1322 of the injection channel 132.

[0048] Reference Figure 3 and Figure 5 The cross-section of the inner cavity of the straight cylindrical part 11 is hexagonal. The inner wall of the straight cylindrical part 11 is adapted to and clearance fits the outer wall of the stud head 411, thereby limiting the stud head 411. The stud head 411 can only slide and cannot rotate (with the stud as the center), avoiding the problem that the bolt 41 rotates with the nut 42 under the action of friction when the user rotates the nut 42.

[0049] Reference Figure 3 and Figure 5 The inner wall of the straight section 11 is provided with a flow channel 111. The flow channel 111 is concave. Due to the clearance fit between the inner wall of the straight section 11 and the outer wall of the column head 411, the fluid velocity drops sharply when it flows through this point; after setting the flow channel 111, the fluid can avoid the problem of sudden velocity reduction, shorten the overall time of the pressure test, and improve work efficiency.

[0050] Reference Figure 1The pressure measuring component 3 includes an extension tube 31 and a pressure gauge 32. The pressure gauge 32 is fixedly connected to the outer end of the extension tube 31 (e.g., by welding or by bolts 41 and a sealing ring). The pressure gauge 32 communicates with the inner cavity of the extension tube 31. The extension tube 31 is perpendicularly inserted into the straight cylinder 11. The extension tube 31 and the straight cylinder 11 are sealed and fixedly connected (e.g., by welding or by a sealing ring).

[0051] Reference Figure 1 and Figure 6 The inner end 1322 of the extension tube 31 is provided with an inner extension 311, which is interconnected with and fixedly connected to the extension tube 31 (e.g., by integral fixed connection or by welding fixed connection); the inner extension 311 is coaxially arranged with the extension tube 31. The inner extension 311 is provided inwardly protruding with reference to the inner wall of the straight cylindrical part 11, and the inner extension 311 is used to abut against the column head 411 to prevent the bolt 41 from coming out of the insertion hole 131 (i.e., to prevent the bolt 41 from falling into the inner cavity of the housing 1).

[0052] Reference Figure 1 and Figure 7 The minimum distance between the inner tube and the first sealing plate 13 is a, and the sum of the thicknesses of the column head 411 and the first sealing ring 43 is b, where a > b and ab ≥ 10 mm, thereby ensuring that there is a sufficiently wide gap between the first sealing ring 43 and the first sealing plate 13 to improve the fluid injection speed.

[0053] Reference Figure 3 The first sealing plate 13 has an exhaust hole 133, and the opening of the exhaust hole 133 on the inner end face of the first sealing plate 13 is within the first projection range; therefore, when the first sealing ring 43 presses against the first sealing plate 13, it can simultaneously block the exhaust hole 133 and the injection channel 132, thereby achieving pressure maintenance in the inner cavity of the shell 1 and the inner cavity of the buried pipe 5. (Refer to...) Figure 1 When this utility model is used, it can be placed vertically or at an angle. This ensures that the original gas in the inner cavity of the shell 1 and the inner cavity of the buried pipe 5 can be discharged through the exhaust hole 133 when fluid is injected.

[0054] Reference Figure 6The straight cylindrical section 11 includes a first cylindrical body 1101, a second cylindrical body 1102, and a second sealing ring 1103. The first cylindrical body 1101 and the second cylindrical body 1102 are coaxially arranged and detachably connected. The first cylindrical body 1101 and the second cylindrical body 1102 are connected by threads, and the second sealing ring 1103 is pressed between the first cylindrical body 1101 and the second cylindrical body 1102. During the production and assembly of this utility model, the bolt 41 is first inserted into the insertion hole 131 (and the nut 42 is tightened so that the post head 411 is pressed against the first sealing plate 13), and then the extension tube 31 is installed. The purpose of the detachable connection between the first cylindrical body 1101 and the second cylindrical body 1102 is to enable the bolt 41 to be inserted into the insertion hole 131 from the inside out.

[0055] The first cylinder 1101 is fixedly connected to the first sealing plate 13, and the extension tube 31 is inserted into the first cylinder 1101; the second cylinder 1102 is fixedly connected to the expansion part 12.

[0056] The flow channel 111 is located on the inner wall of the first cylinder 1101; the flow channel 111 is arranged along the axial direction of the first cylinder 1101.

[0057] The test steps include: ① Connecting the double U-shaped buried pipe 5 to the connecting pipe 21; ② Loosening the nut 42; ③ Activating the pressurization component, and the user reads the reading of the pressure gauge 32 in real time; ④ Tightening the nut 42 after the reading of the pressure gauge 32 reaches the target value; ⑤ Removing the pressurization component and transferring it to the next construction node.

[0058] This utility model has a simple structure and reliable function. A single utility model can be connected to the double U-shaped buried pipe 5 for pressure testing without repeated operations, which can significantly reduce operation steps and improve work efficiency. The sealing component 4 simultaneously controls the opening and closing states of the injection channel 132 and the exhaust port, resulting in a simple structure, low cost, and compact size. Since the pressure holding time is usually more than one hour, after the buried pipe 5 at this construction node is pressure-held, the user can remove the pressurizing component and then transfer it to other construction nodes for pressurizing their buried pipes 5.

[0059] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0060] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this utility model based on its guidance, without departing from its principles and spirit, shall still fall within the protection scope of this utility model.

Claims

1. A four-way pressure-sealing fitting for a ground source heat pump, characterized in that: It includes a housing (1), a connecting assembly (2), a pressure measuring assembly (3), a sealing assembly (4), and a pressurizing assembly; One end of the housing (1) is connected to the connecting assembly (2), and the other end is provided with an injection channel (132). The sealing component (4) is disposed at one end of the housing (1) away from the connecting component (2) and is used to control the opening and closing of the inner end (1322) of the injection channel (132); the pressurizing component is detachably connected to the outer end (1321) of the injection channel (132); The pressure measuring component (3) is located on the side wall of the housing (1); The connecting component (2) is a four-way structure for connecting the double U-shaped underground pipe (5).

2. The four-way pressure-sealing fitting for a ground source heat pump according to claim 1, characterized in that: The housing (1) includes a straight cylindrical part (11), an expansion part (12), a first sealing plate (13), and a second sealing plate (14); the straight cylindrical part (11) and the expansion part (12) are coaxially arranged and their ends are sealed to each other; the inner cavity of the straight cylindrical part (11) is in communication with the inner cavity of the expansion part (12); the first sealing plate (13) is disposed at one end of the straight cylindrical part (11) away from the expansion part (12); the second sealing plate (14) is disposed at one end of the expansion part (12) away from the straight cylindrical part (11); the injection channel (132) is disposed inside the first sealing plate (13), and the sealing assembly (4) is connected to the first sealing plate (13).

3. The four-way pressure-sealing fitting for a ground source heat pump according to claim 2, characterized in that: The four-way structure includes four connecting pipes (21) that are inserted into the second sealing plate (14).

4. The four-way pressure-sealing fitting for a ground source heat pump according to claim 3, characterized in that: The connecting pipes (21) are arranged in parallel to each other; the inner cavity of the connecting pipe (21) is in communication with the inner cavity of the shell (1).

5. The four-way pressure-sealing fitting for a ground source heat pump according to claim 4, characterized in that: The injection channel (132) is arranged in an L-shape.

6. The four-way pressure-sealing fitting for a ground source heat pump according to claim 5, characterized in that: The sealing assembly (4) includes a bolt (41), a nut (42), and a first sealing ring (43) for sealing the inner end (1322) of the injection channel (132); the bolt (41) includes a stud (411) and a stud that is vertically fixedly connected to the stud (411); the first sealing plate (13) is provided with an insertion hole (131), and the stud is inserted into the insertion hole (131); the first sealing ring (43) is sleeved on the outer surface of the stud and pressed against the stud (411), the stud (411) is located at the end of the inner cavity of the housing (1) away from the connecting assembly (2), and the nut (42) is located at the outer end face of the first sealing plate (13).

7. The four-way pressure-sealing fitting for a ground source heat pump according to claim 6, characterized in that: The first sealing ring (43) is disposed between the column head (411) and the first sealing plate (13).

8. The four-way pressure-sealing fitting for a ground source heat pump according to claim 7, characterized in that: The projection of the first sealing ring (43) on the inner wall of the first sealing plate (13) is the first projection, and the inner end (1322) of the injection channel (132) is located within the first projection range.

9. The four-way pressure-sealing fitting for a ground source heat pump according to claim 8, characterized in that: The cross-section of the inner cavity of the straight cylindrical part (11) is hexagonal, and the inner wall of the straight cylindrical part (11) is adapted to and clearance fits the outer wall of the column head (411); the inner wall of the straight cylindrical part (11) is provided with a flow channel (111).

10. The four-way pressure-sealing fitting for a ground source heat pump according to claim 9, characterized in that: The pressure measuring assembly (3) includes an extension tube (31) and a pressure gauge (32); the pressure gauge (32) is fixedly connected to the outer end of the extension tube (31), and the extension tube (31) is inserted into the straight cylinder (11); the inner end (1322) of the extension tube (31) is provided with an inner extension (311), and the inner extension (311) is used to abut against the head (411) to prevent the bolt (41) from coming out of the insertion hole (131).

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