CN202792688U - Pipe pile annulus wall embedded type double U-shaped ground source heat pump buried pipe system - Google Patents

Abstract

A double U-shaped ground source heat pump buried pipe system embedded in the pipe pile ring wall, including a buried pipe heat exchanger, a ground source heat pump and pipe piles; each buried pipe heat exchanger is buried in a pipe pile In the ring wall; the medium inlet port and the medium outlet port of the buried pipe heat exchanger are respectively connected to the medium outlet port and the medium inlet port of the ground source heat pump; the buried pipe heat exchanger is axisymmetric around the pipe pile axis Two U-shaped pipes; the medium outlet end and the medium inlet end of the two U-shaped pipes are respectively connected. This system combines the burying of the buried tube heat exchanger of the ground source heat pump system with the pipe pile of the underground project, which can save the cost of drilling and burying the buried tube heat exchanger, reduce the cost, and solve the problem that the heat pump system occupies the underground The problem of large space, and it can effectively protect the buried tube heat exchanger, improve its durability and reliability, and at the same time make full use of the good thermal conductivity and heat capacity of concrete to improve the heat transfer effect.

Description

Pipe pile ring wall buried double U-shaped ground source heat pump buried pipe system

technical field

The utility model relates to a ground-source heat pump buried pipe system, in particular to a ground-source heat pump buried pipe system buried in the ring wall of pipe piles. the

Background technique

Ground source heat pump is a high-efficiency energy-saving air conditioning system that uses underground shallow geothermal resources (also known as geothermal energy) for both heating and cooling. The ground source heat pump realizes the transfer of low-temperature heat energy to high-temperature heat energy by inputting a small amount of high-grade energy (such as electric energy). The ground energy is used as the heat source of heat pump heating in winter and the cold source of air conditioning in summer, that is, in winter, the heat in the ground energy is "taken" out, and after raising the temperature, it is used for indoor heating; in summer, the heat in the room is taken out and released Go to the ground energy. Usually the ground source heat pump consumes 1kW of energy, and the user can get more than 4kW of heat or cold. Ground source heat pumps save more than two-thirds of the electric energy compared with electric boiler heating, and more than one-half of the energy compared with fuel boilers, and the operating cost is only 50-60% of that of ordinary central air-conditioning. Therefore, in the past ten years, the ground source heat pump air-conditioning system has achieved rapid development in North America such as the United States, Canada, and Central and Northern Europe such as Switzerland and Sweden. In terms of thermal energy, it is planned that in the next five years, the heating (cooling) area of ground source heat pumps will be 350 million square meters, and the total market size will be at least 70 billion yuan. It can be expected that my country's ground source heat pump market will set off a round of climax. the

The ground source heat pump system has the following problems: First, the burial of its underground heat exchange system (buried pipe system) will occupy a large amount of land, which will add more difficulties to urban areas where the land is already tight, and it is not easy to carry out large-scale promotion; The initial investment in the construction of the source heat pump system is large, of which the drilling construction cost of the buried pipe accounts for a considerable proportion; the third is that the construction quality of the buried pipe cannot be effectively guaranteed in the current traditional bored pipe. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a ground source heat pump buried pipe system which occupies less underground space, reduces construction costs, and has good heat transfer effect and is buried in the ring wall of pipe piles. the

In order to solve the above-mentioned technical problems existing in the prior art, the utility model proposes the following technical solutions:

A double U-shaped ground source heat pump buried pipe system embedded in the pipe pile ring wall, including a buried pipe heat exchanger, a ground source heat pump and pipe piles; there are one or more buried pipe heat exchangers, The number of pipe piles corresponds to the number of buried pipe heat exchangers; each buried pipe heat exchanger is buried in the ring wall of a pipe pile; the medium inlet port and medium outlet port of the buried pipe heat exchanger are respectively connected to the ground source The medium outlet port and the medium inlet port of the heat pump are connected correspondingly;

The buried pipe heat exchanger is composed of two U-shaped pipes that are axisymmetric around the pile axis; the medium outlet ends of the two U-shaped pipes are connected as the medium outlet end of the local buried pipe heat exchanger, and the two U-shaped pipes The medium inlet port of the local borehole heat exchanger is connected as the medium inlet port of the local borehole heat exchanger. the

There are multiple buried tube heat exchangers, and the number of pipe piles corresponds to the number of buried tube heat exchangers; the medium outlet and medium inlet of each buried tube heat exchanger are connected in parallel, and then connected to the ground source heat pump Corresponding connection between the media inlet port and the media outlet port. the

Preferably, two straight pipes of each U-shaped pipe are buried in the ring wall of the pipe pile, and the end connecting sections of the two straight pipes are arranged along the ring wall of the pipe pile; the connecting sections of two adjacent U-shaped pipes are arranged along the The ring wall of the pipe pile is arranged in a circumferential direction. the

The medium inlet end and the medium outlet end of the buried pipe heat exchanger are exposed outside the top of the pipe pile. the

The pipe pile is a steel pipe pile, a prefabricated reinforced concrete pipe pile or a steel pipe concrete pipe pile. the

Solution 1. The pipe pile is a steel pipe pile, and the two straight pipe parts of each U-shaped pipe are welded on the inner wall of the ring wall of the steel pipe pile. the

Scheme 2. The pipe piles are prefabricated reinforced concrete pipe piles, and the two straight pipe parts of each U-shaped pipe are bound on the reinforcement cage of the prefabricated reinforced concrete pipe piles. the

Scheme 3. The pipe pile is a concrete-filled steel pipe pile, and the two straight pipe parts of each U-shaped pipe are welded on the steel pipe wall of the concrete-filled steel pipe pile and wrapped by concrete. the

During engineering construction, the two ends of the top of the buried pipe heat exchanger must be exposed 1m outside the top of the pipe pile, and there is a certain gap between the bottom connecting section of the buried pipe heat exchanger and the bottom of the pipe pile, for example, 0.5-2m . the

As the engineering implementation of this technical solution, the buried tube heat exchanger can be selected from one or any combination of single U-type, W-type, parallel double U-type and spiral tubular heat exchangers. the

The utility model combines the burying of the buried pipe heat exchanger of the ground source heat pump system with the pipe pile of the underground engineering, which can save the cost of drilling and burying the buried pipe heat exchanger, reduce the cost, and can also solve the problem that the heat pump system occupies The problem of large underground space can effectively protect the buried pipe heat exchanger, improve its durability and reliability, and at the same time make full use of the good thermal conductivity and heat capacity of concrete to improve the heat transfer effect. the

Description of drawings

Fig. 1 is a schematic diagram of an axial section of the utility model. the

Fig. 2 is a schematic diagram of the horizontal deployment of the single pipe pile in Fig. 1 . the

FIG. 3 is a schematic top view of FIG. 1 . the

In the figure, 1. Pipe pile, 11. Concrete, 2. Buried pipe heat exchanger, 21. End connecting section of two straight pipes of U-shaped pipe, 22. Connection main pipe (the medium of each buried pipe heat exchanger The inlet port and the medium outlet port are respectively connected to it correspondingly), 3. Ground source heat pump. the

Detailed ways

A double U-shaped ground source heat pump buried pipe system embedded in the pipe pile ring wall, including a buried pipe heat exchanger, a ground source heat pump and pipe piles; there are one or more buried pipe heat exchangers, The number of pipe piles corresponds to the number of buried pipe heat exchangers; each buried pipe heat exchanger is buried in the ring wall of a pipe pile; the medium inlet port and medium outlet port of the buried pipe heat exchanger are respectively connected to the ground source The medium outlet port and the medium inlet port of the heat pump are connected correspondingly; the buried pipe heat exchanger forms two axisymmetric U-shaped pipes around the pipe pile axis; The medium outlet end of the heater and the medium inlet end of the two U-shaped tubes are connected to serve as the medium inlet end of the local buried tube heat exchanger. the

There are multiple buried tube heat exchangers, and the number of pipe piles corresponds to the number of buried tube heat exchangers; the medium outlet and medium inlet of each buried tube heat exchanger are connected in parallel, and then connected to the ground source heat pump Corresponding connection between the media inlet port and the media outlet port. the

Preferably, two straight pipes of each U-shaped pipe are buried in the ring wall of the pipe pile, and the end connecting sections of the two straight pipes are arranged circumferentially along the ring wall of the pipe pile; the connecting sections of two adjacent U-shaped pipes Arranged circumferentially along the ring wall of the pipe pile. the

The medium inlet end and the medium outlet end of the buried pipe heat exchanger are exposed outside the top of the pipe pile. the

The pipe pile is a steel pipe pile, a prefabricated reinforced concrete pipe pile or a steel pipe concrete pipe pile. the

Solution 1. The pipe pile is a steel pipe pile, and the two straight pipe parts of each U-shaped pipe are welded on the inner wall of the ring wall of the steel pipe pile. the

Scheme 2. The pipe piles are prefabricated reinforced concrete pipe piles, and the two straight pipe parts of each U-shaped pipe are bound on the reinforcement cage of the prefabricated reinforced concrete pipe piles. the

Scheme 3. The pipe pile is a concrete-filled steel pipe pile, and the two straight pipe parts of each U-shaped pipe are welded on the steel pipe wall of the concrete-filled steel pipe pile and wrapped by concrete. the

The ground source heat pump buried pipe system of the present invention buried in the pipe pile ring wall will be described in detail below with reference to the accompanying drawings. the

The pipe piles are prefabricated in the factory, and the manufacturing process is as follows: making steel cages; connecting the steel cages with metal connectors at the pile head, and placing various embedded parts; putting the steel cages into steel molds, pouring concrete into the steel molds, and completing the pile The prototype of the pile body; the above-mentioned steel form equipped with the prototype of the pile body rotates around the pile axis, and the concrete is centrifugally compacted and formed; curing and demoulding. Pipe piles can be divided into prestressed high-strength concrete pipe piles (codenamed PHC), prestressed concrete pipe piles (codenamed PC) and prestressed concrete thin-walled pipe piles (codenamed PTC) according to the concrete grade and wall thickness. the

The utility model combines the buried pipe heat exchanger of the ground source heat pump system with the pipe pile 1 in the underground engineering, which can save the cost of drilling and embedding, reduce the cost, and can also solve the problem that the ground source heat pump system occupies underground space It is a big problem, and it can effectively protect the buried tube heat exchanger 2, improve its durability and reliability, and at the same time make full use of the good thermal conductivity and heat capacity of concrete to improve the heat transfer effect. Therefore, combining the buried pipe heat exchanger 2 of the ground source heat pump system with the pipe pile 1 in the underground engineering will become a new direction for further popularization and application of the ground source heat pump system. the

As shown in FIG. 1 , the buried pipe system of the ground source heat pump includes a buried pipe heat exchanger 2 and a pipe pile 1 , and the buried pipe heat exchanger 2 is pre-buried in the ring wall of the pipe pile 1 . The buried pipe heat exchanger 2 is arranged circumferentially along the ring wall of the pipe pile 1 . The buried pipe heat exchanger 2 is bound to the steel cage in the pipe pile 1 . A heat transfer medium is arranged in the buried pipe heat exchanger 2 , and both ends of the buried pipe heat exchanger 2 are connected in groups and parallel to the ground source heat pump 3 . the

As shown in Figure 1 and Figure 3, the pipe piles 1 are provided in multiples, and a set of buried pipe heat exchangers 2 is arranged in each pipe pile 1, and each set of buried pipe heat exchangers 2 The two ends are respectively connected in parallel through the connecting main pipe 22, and the connecting main pipe 22 is then connected to the ground source heat pump 3. the

This utility model is mainly designed for the buried position and method of the buried tube heat exchanger 2 in the ground source heat pump system, as shown in Figure 1, Figure 2 and Figure 3, the production and construction steps are as follows:

1. Prefabricate the pipe piles, firstly make the steel cage, bind the buried pipe heat exchanger 2 of the ground source heat pump system on the inside of the steel cage, and the two ends of the top of the buried pipe heat exchanger 2 in the single pile The head must be exposed 1m outside the top of the pile. There is a certain gap between the end connecting section 21 of the two straight pipes of the U-shaped pipe and the bottom of the pipe pile 1, such as 0.5-2m (as shown in Figures 1 and 2). The end connection section 21 of two straight pipes is arranged along steel cage ring direction (shown in dotted line among Fig. 3);

2. Put the reinforced cage of the buried pipe heat exchanger 2 bound into the steel mold, pour concrete 11 into the steel mold, pour the buried pipe heat exchanger 2 and the reinforced cage into the pipe pile 1 together, and complete Pile prototype;

3. The above-mentioned steel mold equipped with the prototype of the pile body rotates around the pile axis, the concrete is centrifugally compacted, cured after forming, and demoulded;

4. Use a static pile driver or a hammer pile driver to press or drive the prefabricated pipe pile 1 into the soil layer to the design elevation, and the position and number of piles are determined according to the design requirements. the

A heat transfer medium is arranged in the buried pipe heat exchanger 2, and the heat transfer medium circulates in the loop system of the buried pipe heat exchanger 2, and exchanges heat with the concrete in the pipe pile 1 and the surrounding soil layer. The two ends at the top of the buried tube heat exchanger 2 are exposed 1m away from the top of the tube pile 1, and are connected in parallel to the connecting main pipe 22 in groups, and then connected to the ground source heat pump 3 . the

In general underground engineering, multiple pipe piles 1 need to be installed, and a group of buried pipe heat exchangers 2 are arranged in each pile, and the two ends at the top of each group of buried pipe heat exchangers 2 are exposed outside the pile top 1m, and connected in parallel to the main pipe 22 by grouping to form a loop, and then connected to the ground source heat pump 3. The parallel connection mode of the buried tube heat exchanger 2 means that each group of buried tube heat exchangers 2 can be directly connected to the connecting main pipe 22 without passing through other groups of buried tube heat exchangers 2, and then connected to the ground source heat pump 3 Connected, similar to parallel connection in circuit connection. the

The working principle of the utility model is as follows: the rock and soil layer with a certain depth underground has a constant ground temperature all year round, and most of the underground projects are located in such a soil layer, which provides favorable conditions for the ground source heat pump system utilizing the ground temperature energy. A buried pipe heat exchanger 2 is buried in the pipe pile 1 to form a loop. When the heat transfer medium circulates in the buried pipe heat exchanger 2 loop system, it exchanges heat with the concrete in the pipe pile 1 and the surrounding soil layer. Absorb (or release) heat, according to energy conservation, this part of energy can be used to heat (or cool) the room, thereby reducing the energy consumption of the air conditioning system during operation. the

Combining the construction of the ground source heat pump system with the production and construction of underground engineering pipe piles has the following advantages:

In terms of space layout, since the buried tube heat exchanger 2 is buried in the underground engineering structure, the land occupation of the traditional buried tube heat exchanger 2 and the drilling for the buried tube heat exchanger 2 can be omitted. Holes and other construction costs;

In terms of construction quality control, since the buried pipe heat exchanger 2 is bound to the main reinforcement of the steel cage and then lowered to the design elevation, the construction quality of the buried pipe can be well guaranteed, which can well prevent the traditional In the way of drilling and burying, if the buried pipe heat exchanger 2 deviates during the lowering process or the pipeline is damaged, the durability and reliability of the buried pipe heat exchanger 2 will be greatly improved under the protection of the concrete 11;

In terms of heat transfer performance, since concrete has good thermal conductivity and high heat capacity, embedding the buried pipe heat exchanger 2 in the concrete 11 of the pipe pile can improve the heat transfer capacity of the buried pipe heat exchanger 2 and heat transfer effects;

In terms of economy, this technology can greatly reduce the initial investment of the ground source heat pump system because it saves the land occupation of the buried tube heat exchanger 2 and the cost of additional drilling construction. the

Pipe piles are divided into steel pipe piles, prefabricated reinforced concrete pipe piles and steel pipe concrete pipe piles. As a form of foundation treatment and pile foundation, pipe piles have been greatly developed since they were produced at the beginning of the last century. They have been widely used in various building foundations and played a huge role. It is developing in the direction of replacing traditional solid piles in an all-round way. the

This technical solution closely combines the heat exchange components with the pipe pile structure, which can not only ensure the stability and durability of the underground heat exchange system; the cost is lower than other energy-saving technologies; it is also versatile and does not take up extra space; and through The energy it obtains is renewable, stable and reliable, clean and durable, and has significant economic and environmental benefits. Therefore, the energy-saving technology that combines heat exchange components with pipe pile structures has great development potential and broad applications in my country. prospect. the

Claims (8)

1. the double-U-shaped ground buried pipe of ground source heat pump system of a pile tube ring wall built-in type is characterized in that comprising ground heat exchanger, earth source heat pump and pile tube; Described ground heat exchanger has one or more, and the quantity of pile tube is corresponding with ground heat exchanger quantity; Each ground heat exchanger is embedded in the pile tube; The medium inlet end of ground heat exchanger is connected the corresponding connection with the medium inlet end of media outlet end with earth source heat pump with the media outlet end;

Described ground heat exchanger becomes axisymmetric two U-shaped pipes around the pile tube axis; The media outlet end of two U-shaped pipes connects rear media outlet end as this ground heat exchanger, the continuous rear medium inlet end as this ground heat exchanger of the medium inlet end of two U-shaped pipes.

2. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 1 is characterized in that described pile tube is steel-pipe pile, prefabricated reinforced concrete pile tube or steel pipe concrete pipe pile.

3. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 1 is characterized in that the medium inlet end of described ground heat exchanger and media outlet end are exposed at outside the pile tube top.

4. according to claim 1, the double-U-shaped ground buried pipe of ground source heat pump system of 2 or 3 described pile tube ring wall built-in types, it is characterized in that two straight tubes of every U-shaped pipe all are embedded in the pile tube ring wall, the terminal linkage section of two straight tubes is arranged along the ring wall hoop of pile tube.

5. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 4 is characterized in that described pile tube is steel-pipe pile, and two straight-tube portions of described every U-shaped pipe are welded on the inwall of ring wall of steel-pipe pile.

6. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 4, it is characterized in that described pile tube is the prefabricated reinforced concrete pile tube, two straight-tube portion colligations of described every U-shaped pipe are on the steel reinforcement cage of prefabricated reinforced concrete pile tube.

7. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 4, it is characterized in that described pile tube is steel pipe concrete pipe pile, two straight-tube portions of described every U-shaped pipe are welded on the steel pipe walls of steel pipe concrete pipe pile, and are wrapped up by concrete.

8. the double-U-shaped ground buried pipe of ground source heat pump system of pile tube ring wall built-in type according to claim 1, it is a plurality of to it is characterized in that described ground heat exchanger has, and the quantity of pile tube is corresponding with ground heat exchanger quantity; The media outlet end of each ground heat exchanger and medium inlet end be respectively after the parallel connection, again with the corresponding connection with the media outlet end of medium inlet end of earth source heat pump.

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