A ground heat exchanger, a heat exchange system and a method for using the ground heat exchanger

Abstract

The present application relates to the technical field of renewable energy, in particular to a buried pipe, a heat exchange system and a use method of the buried pipe. The buried pipe comprises: a water inlet pipe provided with a water inlet; a water outlet pipe arranged at intervals from the water inlet pipe, and provided with a water outlet; a horizontal pipe structure comprising a shallow horizontal pipe and a deep horizontal pipe, the shallow horizontal pipe and the deep horizontal pipe being respectively communicated with the water inlet pipe and the water outlet pipe; a first opening and closing structure arranged in the water inlet pipe, the height of the first opening and closing structure being lower than the shallow horizontal pipe; and a second opening and closing structure arranged in the shallow horizontal pipe. The present application solves the problems of the geothermal heat exchange system, such as the need for multiple equipment cooperation, large investment and complex structure, thereby providing a buried pipe, a heat exchange system and a use method of the buried pipe.

Description

Technical Field

[0001] This invention relates to the field of renewable energy technology, specifically to a buried pipe, a heat exchange system, and a method for using the buried pipe. Background Technology

[0002] A ground source heat pump with buried pipes is a cooling and heating system that uses a relatively constant underground temperature field as a cold or heat source. The buried pipes use circulating water as a heat exchange medium to extract heat or cold from underground to the surface and exchange heat with the evaporator or condenser of the heat pump.

[0003] In existing geothermal heat exchange systems, technicians combine medium-deep geothermal buried pipe units, shallow buried pipe units, and cooling tower units, relying on model calculations to achieve a balance between heating and cooling demands. However, the system requires the cooperation of multiple devices, resulting in problems such as large investment and complex structure. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of existing geothermal heat exchange systems, which require the cooperation of multiple devices, have large investment and complex structure, and thus provide a buried pipe, a heat exchange system and a method for using the buried pipe.

[0005] To address the above problems, the present invention provides a buried pipe, comprising:

[0006] Water inlet pipe, wherein the water inlet pipe is provided with a water inlet;

[0007] A water outlet pipe is provided at an interval from the water inlet pipe, and the water outlet pipe is provided with a water outlet.

[0008] The horizontal pipe structure includes a shallow horizontal pipe and a deep horizontal pipe, wherein the shallow horizontal pipe and the deep horizontal pipe are respectively connected to an inlet pipe and an outlet pipe;

[0009] A first opening and closing structure is provided inside the water inlet pipe, and the height of the first opening and closing structure is lower than that of the shallow horizontal pipe.

[0010] The second opening and closing structure is located inside the shallow horizontal pipe.

[0011] Optionally, the first opening and closing structure includes a first constrictor, a floating ball, and a first bending combination plate. The first constrictor is fixedly disposed on the inner wall of the water inlet pipe, the first bending combination plate is disposed below the first constrictor, and the floating ball is disposed between the first bending combination plate and the first constrictor.

[0012] Optionally, the second opening and closing structure includes a second necker, a second bending combination plate, a connecting rod, and a connecting ball. The second necker is fixedly disposed on the inner wall of the shallow horizontal pipe, and the two ends of the connecting rod are respectively fixedly connected to the second bending combination plate and the connecting ball.

[0013] Optionally, the second opening and closing structure further includes a third bending combination plate, wherein the second bending combination plate and the third bending combination plate are respectively disposed on the left and right sides of the second necker.

[0014] Optionally, the cross-sectional area of ​​the first and second neckers in the direction of water flow first increases and then decreases.

[0015] Optionally, the first bending composite plate, the second bending composite plate, and the third bending composite plate are all composed of a first metal deformation sheet and a second metal deformation sheet, and the first metal deformation sheet and the second metal deformation sheet have different coefficients of thermal expansion.

[0016] Optionally, the water inlet pipe includes a shallow water inlet pipe and a deep water inlet pipe, and the first opening and closing structure is disposed in the deep water inlet pipe; the water outlet pipe includes a shallow water outlet pipe and a deep water outlet pipe, and the deep water outlet pipe is provided with an anti-backflow rod.

[0017] Optionally, the inlet pipe and the outlet pipe are arranged in parallel.

[0018] A heat exchange system comprising the aforementioned underground pipe.

[0019] A method for using a buried pipe includes the following steps:

[0020] When in cooling mode, the first opening and closing structure is closed and the second opening and closing structure is open, so that water flows through the shallow horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet.

[0021] When heating is in operation, the first opening and closing structure is in the open state and the second opening and closing structure is in the closed state, so that water flows through the deep horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet.

[0022] The technical solution of this invention has the following advantages:

[0023] 1. The buried pipe provided by this invention includes: an inlet pipe with an inlet; an outlet pipe spaced apart from the inlet pipe with an outlet; a horizontal pipe structure including a shallow horizontal pipe and a deep horizontal pipe, the shallow horizontal pipe and the deep horizontal pipe being connected to the inlet pipe and the outlet pipe respectively; a first opening and closing structure disposed inside the inlet pipe, the height of the first opening and closing structure being lower than that of the shallow horizontal pipe; and a second opening and closing structure disposed inside the shallow horizontal pipe. By setting the first and second opening and closing structures, the switching between cold extraction and hot extraction can be realized, eliminating the need to install other switching control equipment outside the buried pipe, thus having the advantage of simple structure.

[0024] 2. The buried pipe provided by the present invention includes a first opening and closing structure comprising a first necking device, a floating ball, and a first bending combination plate. The first necking device is fixedly disposed on the inner wall of the inlet pipe, the first bending combination plate is disposed below the first necking device, and the floating ball is disposed between the first bending combination plate and the first necking device. The opening and closing states of the first opening and closing structure are controlled by the position change of the floating ball. When the fluid temperature in the inlet pipe is higher than a certain threshold, the first bending combination plate bends due to heat, causing the floating ball to float upward and block the flow channel in the first necking device, thus automatically closing the first opening and closing structure. When the fluid temperature in the inlet pipe is lower than a certain threshold, the first opening and closing structure automatically opens, the first bending combination plate remains horizontal, the floating ball cannot block the flow channel of the first necking device, and water flows smoothly through the first opening and closing structure.

[0025] 3. The buried pipe provided by this invention includes a second opening and closing structure comprising a second necker, a second bending combination plate, a connecting rod, and a connecting ball. The second necker is fixedly installed on the inner wall of the shallow horizontal pipe. The two ends of the connecting rod are respectively fixedly connected to the second bending combination plate and the connecting ball, so that the deformation of the second bending combination plate drives the position change of the connecting ball, thereby controlling the opening and closing of the second opening and closing structure. When the fluid temperature in the inlet pipe is lower than a certain threshold, the second opening and closing structure needs to be closed. The second bending combination plate does not bend, causing the connecting ball to block the flow channel of the second necker. When the fluid temperature in the inlet pipe is higher than a certain threshold, the second opening and closing structure needs to be opened. The second bending combination plate automatically bends, pushing the connecting ball to move. The connecting ball cannot block the flow channel of the second necker, allowing the water to flow smoothly through the second opening and closing structure.

[0026] 4. The buried pipe provided by the present invention further includes a third bending combination plate in the second opening and closing structure. The second and third bending combination plates are respectively disposed on the left and right sides of the second necker. The position of the connecting ball is defined by the combination of the second and third bending combination plates. When the second opening and closing structure needs to be closed, the second bending combination plate does not bend, and the third bending combination plate bends to push the connecting ball and block the flow channel of the second necker. When the second opening and closing structure needs to be opened, the second bending combination plate bends to push the connecting ball to move, and the third bending combination plate does not bend. The connecting ball cannot block the flow channel of the second necker, allowing water to flow smoothly through the second opening and closing structure.

[0027] 5. In the buried pipe provided by the present invention, the cross-sectional area of ​​the first and second neckers in the direction of water flow first increases and then decreases. By changing the cross-sectional area, the floating ball and the connecting ball can block the flow channel of the necker at the point where the cross-sectional area is the smallest.

[0028] 6. The buried pipe provided by the present invention comprises a first bending combined plate, a second bending combined plate, and a third bending combined plate, all of which are composed of a first metal deformation sheet and a second metal deformation sheet. The first metal deformation sheet and the second metal deformation sheet have different coefficients of thermal expansion. By determining the positions of the first metal deformation sheet and the second metal deformation sheet, the bending direction of the bending combined plate satisfies the working conditions described in points 2, 3, and 4 above.

[0029] 7. The buried pipe provided by the present invention includes a shallow water inlet pipe and a deep water inlet pipe, and a first opening and closing structure is provided in the deep water inlet pipe; the outlet pipe includes a shallow water outlet pipe and a deep water outlet pipe, and an anti-backflow rod is provided in the deep water outlet pipe to prevent water backflow.

[0030] 8. The underground pipe provided by the present invention has an inlet pipe and an outlet pipe arranged in parallel to facilitate water flow.

[0031] 9. The heat exchange system provided by the present invention has the advantages described in any of the above-mentioned items because it uses the buried pipe described in any of the above-mentioned items.

[0032] 10. The method of using the buried pipe provided by this invention, when in cooling mode, the first opening and closing structure is in a closed state and the second opening and closing structure is in an open state, so that water flows through the shallow horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet; when in heating mode, the first opening and closing structure is in an open state and the second opening and closing structure is in a closed state, so that water flows through the deep horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet. The first and second opening and closing structures of this application realize automatic temperature sensing and switching action without manual switching; the shallow pipe and deep pipe of this application are a single pipe, so that only the upper half is used in summer and the entire pipe length is used for heat exchange in winter, which has the advantage of simple overall structure. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the buried pipe in a heating state according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the underground pipe in a cooling state provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of a first curved composite plate and a floating ball provided in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached drawings: 101, shallow water inlet pipe; 102, deep water inlet pipe; 103, deep horizontal pipe; 104, deep water outlet pipe; 105, shallow water outlet pipe; 106, shallow horizontal pipe; 201, first necker; 202, floating ball; 203, first bending combination plate; 301, second necker; 302, connecting ball; 303, third bending combination plate; 304, second bending combination plate; 305, connecting rod; 401, anti-backflow rod. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] The buried pipe provided by this invention includes: an inlet pipe with an inlet; an outlet pipe spaced apart from the inlet pipe and having an outlet; a horizontal pipe structure including a shallow horizontal pipe 106 and a deep horizontal pipe 103, the shallow horizontal pipe 106 and the deep horizontal pipe 103 being connected to the inlet pipe and the outlet pipe, respectively; a first opening and closing structure disposed inside the inlet pipe, the height of the first opening and closing structure being lower than that of the shallow horizontal pipe 106; and a second opening and closing structure disposed inside the shallow horizontal pipe 106. With the first and second opening and closing structures, there is no need to install multiple devices outside the buried pipe, resulting in a simple structure.

[0044] Example 2

[0045] like Figures 1-3 One specific embodiment of the buried pipe shown includes: a parallel and spaced-apart inlet pipe and an outlet pipe, and a horizontal pipe structure located between the inlet pipe and the outlet pipe, wherein both the inlet pipe and the outlet pipe are perpendicular to the ground, the inlet pipe is provided with an inlet, and the outlet pipe is provided with an outlet.

[0046] like Figure 1 , Figure 2 As shown, the inlet pipe is divided into a shallow inlet pipe 101 and a deep inlet pipe 102, and the outlet pipes are a shallow outlet pipe 105 and a deep outlet pipe 104. The horizontal pipe structure includes a shallow horizontal pipe 106 and a deep horizontal pipe 103. The shallow horizontal pipe 106 is connected to the shallow inlet pipe 101 and the shallow outlet pipe 105, respectively, and the deep horizontal pipe 103 is connected to the deep inlet pipe 102 and the deep outlet pipe 104, respectively.

[0047] like Figure 1 , Figure 2 and Figure 3 As shown, to control the water flow from the inlet into the deep inlet pipe 102, a first opening and closing structure is fixedly installed inside the deep inlet pipe 102, and the height of the first opening and closing structure is lower than that of the shallow horizontal pipe 106. Figure 1, Figure 2 As shown, the first opening and closing structure includes a first constrictor 201, a floating ball 202, and a first bending combination plate 203. The first constrictor 201 is fixedly installed on the inner wall of the deep water inlet pipe 102. The first bending combination plate 203 is located below the first constrictor 201, and the floating ball 202 is located inside the first constrictor 201 and above the first bending combination plate 203. Figure 3 As shown, the first curved composite plate 203 is long and narrow, and its edges are adapted to the inner wall of the deep water inlet pipe 102.

[0048] like Figure 1 , Figure 2 As shown, to control the water flow entering the shallow horizontal pipe 106 from the inlet, a second opening and closing structure is provided inside the shallow horizontal pipe 106. The second opening and closing structure includes a second necker 301. A second curved combination plate 304 is provided on the left side of the second necker 301, and a third curved combination plate 303 is provided on the right side. A connecting rod 305 is fixed on the surface of the second curved combination plate 304 facing the third curved combination plate 303. A connecting ball 302 is fixed on the connecting rod 305, and the connecting ball 302 is in point contact with the third curved combination plate 303. To facilitate the floating ball 202 or the connecting ball 302 blocking the flow channel of the necker, the cross-sectional area of ​​the first necker 201 and the second necker 301 increases first and then decreases from the outside to the inside. To ensure the deformation of the first bending composite plate 203, the second bending composite plate 304, and the third bending composite plate 303, all three are composed of a first metal deformation sheet and a second metal deformation sheet. The first metal deformation sheet and the second metal deformation sheet have different coefficients of thermal expansion, and all three are provided with water passage holes. To prevent backflow, an anti-backflow rod 401 is provided inside the deep water outlet pipe 104.

[0049] Of course, this embodiment does not specifically limit the structure of the first opening and closing structure and the second opening and closing structure. In other embodiments, the above-mentioned first opening and closing structure and the second opening and closing structure can also be an electronically controlled invention controlled by a sensor.

[0050] A heat exchange system comprising the aforementioned underground pipe.

[0051] In practice, when cold water is needed in summer, hot water with a higher temperature enters the shallow inlet pipe 101 through the inlet. Because the water temperature in the shallow inlet pipe 101 is higher than that in the deep inlet pipe 102, the first bending combination plate 203 bends upward, causing the floating ball 202 to move upward until the floating ball 202 blocks the flow channel of the first constrictor 201. At the same time, the second bending combination plate 304 bends and, through the connecting rod 305, causes the connecting ball 302 to move to the right. The connecting ball 302 moves away from the second constrictor 301, allowing the hot water to flow through the shallow horizontal pipe 106 and into the shallow outlet pipe 105. After sufficient heat exchange, the cooler water flows out from the outlet. When hot water is needed in winter, the cooler water flows into the shallow inlet pipe 101 through the inlet. Because the temperature inside the shallow inlet pipe 101 is lower than that inside the deep inlet pipe 102, the first bending combination plate 203 will not bend, and the floating ball 202 will not block the flow channel of the first constrictor 201. The water with lower temperature flows out of the outlet after passing through the shallow inlet pipe 101, the deep inlet pipe 102, the deep horizontal pipe 103, the deep outlet pipe 104, and the shallow outlet pipe 105. At the same time, after sufficient heat exchange, the temperature of the shallow outlet pipe 105 is higher than that of the shallow inlet pipe 101. That is, the water temperature at the end of the shallow horizontal pipe 106 near the shallow outlet pipe 105 is higher than the water temperature at the end near the shallow inlet pipe 101. The third bending combination plate 303 moves toward the second constrictor 301, causing the connecting ball 302 to block the flow channel of the second constrictor 301.

[0052] As an alternative implementation, the number of metal deformation plates in the first bending composite plate 203, the second bending composite plate 304, and the third bending composite plate 303 may be 3, 4, or even more.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A buried pipe, characterized in that, include: Water inlet pipe, wherein the water inlet pipe is provided with a water inlet; A water outlet pipe is provided at an interval from the water inlet pipe, and the water outlet pipe is provided with a water outlet. The horizontal pipe structure includes a shallow horizontal pipe (106) and a deep horizontal pipe (103), wherein the shallow horizontal pipe (106) and the deep horizontal pipe (103) are respectively connected to the inlet pipe and the outlet pipe; The first opening and closing structure is located inside the water inlet pipe, and the height of the first opening and closing structure is lower than that of the shallow horizontal pipe (106). The second opening and closing structure is disposed inside the shallow horizontal pipe (106); The first opening and closing structure includes a first constrictor (201), a floating ball (202), and a first bending combination plate (203). The first constrictor (201) is fixed on the inner wall of the water inlet pipe, the first bending combination plate (203) is located below the first constrictor (201), and the floating ball (202) is located between the first bending combination plate (203) and the first constrictor (201). The second opening and closing structure includes a second necker (301), which is fixedly disposed on the inner wall of the shallow horizontal pipe (106). The second necker (301) has a second bending combination plate (304) on the left side and a third bending combination plate (303) on the right side. A connecting rod (305) is fixed on the surface of the second bending combination plate (304) facing the third bending combination plate (303). A connecting ball (302) is fixed on the connecting rod (305). The connecting ball (302) is in point contact with the third bending combination plate (303). The first bending composite plate (203), the second bending composite plate (304) and the third bending composite plate (303) are all composed of a first metal deformation sheet and a second metal deformation sheet, and the first metal deformation sheet and the second metal deformation sheet have different coefficients of thermal expansion.

2. The underground pipe according to claim 1, characterized in that, The cross-sectional area of ​​the first constrictor (201) and the second constrictor (301) in the direction of water flow first increases and then decreases.

3. The buried pipe according to claim 2, characterized in that, The water inlet pipe includes a shallow water inlet pipe (101) and a deep water inlet pipe (102), and the first opening and closing structure is located inside the deep water inlet pipe (102); the water outlet pipe includes a shallow water outlet pipe (105) and a deep water outlet pipe (104), and the deep water outlet pipe (104) is provided with an anti-backflow rod (401).

4. The underground pipe according to any one of claims 1-3, characterized in that, The inlet and outlet pipes are arranged in parallel.

5. A heat exchange system, characterized in that, Includes the underground pipe as described in any one of claims 1-4.

6. A method of using a buried pipe, for using the buried pipe according to claim 1, characterized in that, Includes the following steps: When in cooling mode, the first opening and closing structure is closed and the second opening and closing structure is open, so that water flows through the shallow horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet. When heating is in operation, the first opening and closing structure is in the open state and the second opening and closing structure is in the closed state, so that water flows through the deep horizontal pipe for heat exchange and then enters the outlet pipe, and then flows out from the outlet.

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