阅读说明：本技术 一种利用工质相变吸热的深井换热热泵系统 (Deep well heat exchange heat pump system utilizing working medium phase change heat absorption ) 是由 彭磊 陈高凯 于 2021-09-29 设计创作，主要内容包括：本发明涉及一种利用工质相变吸热的深井换热热泵系统,包括地埋管,所述地埋管的内部设置有内管组件和外管,所述内管组件包括有内管管道,所述内管管道的内部固定安装有内管,所述内管与外管之间设置有空腔管道,所述地埋管的外部设置有岩石层,所述岩石层与地埋管之间设置有回填层,所述内管管道的顶部固定连接有压缩机,所述地埋管的右侧固定连接有膨胀阀,膨胀阀与压缩机通过冷凝器固定连接。该利用工质相变吸热的深井换热热泵系统,通过在空腔内部设置有以R134a的循环工质,根据R134a蒸发温度低的特点,能够利用其汽化潜热所吸收的热量,提高循环工质的吸热量,能够有效提高热泵系统的效率。(The invention relates to a deep well heat exchange heat pump system utilizing working medium phase change heat absorption, which comprises a buried pipe, wherein an inner pipe assembly and an outer pipe are arranged inside the buried pipe, the inner pipe assembly comprises an inner pipe pipeline, an inner pipe is fixedly arranged inside the inner pipe pipeline, a cavity pipeline is arranged between the inner pipe and the outer pipe, a rock layer is arranged outside the buried pipe, a backfill layer is arranged between the rock layer and the buried pipe, the top of the inner pipe pipeline is fixedly connected with a compressor, the right side of the buried pipe is fixedly connected with an expansion valve, and the expansion valve is fixedly connected with the compressor through a condenser. According to the deep well heat exchange heat pump system utilizing the phase change of the working medium to absorb heat, the circulating working medium R134a is arranged in the cavity, and according to the characteristic of low evaporation temperature of R134a, the heat absorbed by latent heat of vaporization can be utilized, the heat absorption capacity of the circulating working medium is improved, and the efficiency of the heat pump system can be effectively improved.)

1. The utility model provides an utilize endothermic deep well heat transfer heat pump system of working medium phase transition, includes buried pipe (1), its characterized in that: an inner pipe assembly (5) and an outer pipe (6) are arranged inside the buried pipe (1);

the inner pipe assembly (5) comprises an inner pipe pipeline (51), an inner pipe (52) is fixedly installed inside the inner pipe pipeline (51), and a cavity pipeline (53) is arranged between the inner pipe (52) and the outer pipe (6).

2. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 1, characterized in that: the buried pipe is characterized in that a rock layer (8) is arranged outside the buried pipe (1), and a backfill layer (7) is arranged between the rock layer (8) and the buried pipe (1).

3. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 1, characterized in that: the top fixedly connected with compressor (2) of inner tube pipeline (51), the right side fixedly connected with expansion valve (4) of buried pipe (1), expansion valve (4) pass through condenser (3) fixed connection with compressor (2).

4. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 3, characterized in that: the buried pipe (1) is arranged underground, and the compressor (2), the expansion valve (4) and the condenser (3) are arranged on the ground.

5. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 4, characterized in that: the underground pipe (1) is arranged as a sleeve type heat exchanger, and the compressor (2) is arranged as a magnetic suspension compressor.

6. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium as claimed in claim 2, wherein: and the backfill layer (7) is internally provided with the property cement.

7. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 1, characterized in that: the cavity pipelines (53) are distributed in an annular shape.

8. The deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium according to claim 1, characterized in that: and a circulating working medium is arranged in the cavity pipeline (53), and the circulating working medium is R134 a.

Technical Field

The invention relates to the technical field of geothermal resource utilization, in particular to a deep well heat exchange heat pump system utilizing phase change of working media to absorb heat.

Background

With energy consumption, the traditional energy reserves are continuously reduced, the strategic goals of carbon peak reaching and carbon neutralization are realized by assistance, the development and the use of clean energy are imperative, geothermal energy is clean and environment-friendly renewable energy, the competitiveness in the field of clean energy utilization is stronger and stronger, the geothermal energy can be divided into two forms of hydrothermal geothermal energy (water source) and dry hot rock (ground source) in the utilization form at present, wherein the dry hot rock mining technology adopts a closed circulation system, the medium-deep geothermal energy resources can be fully utilized, the characteristics of heat taking and no water taking are realized, and the closed circulation system is one of the key research directions for the development and the utilization of the geothermal energy resources.

The dry and hot rock (ground source) adopts closed circulation, usually adopts the form of buried pipe and utilizes deep well heat exchange technology to exploit mid-deep geothermal resources, and by the form of coaxial sleeve, cold water flows in from the inlet of the outer sleeve, and the cold water is heated by the rock layer through heat conduction and heat transfer in the descending process, and then flows upwards to the well mouth from the inner pipe channel after reaching the bottom of the sleeve, and the heated water is lifted by the heat pump unit, so that the low-grade heat source is converted into the high-grade heat source for building heating, and the cooled circulating water enters the underground heat exchange system again for circulation.

However, the existing buried pipe heat exchange system has the problems of single structure, low heat exchange power and the like, and cannot achieve the expected effect, so that the deep well heat exchange heat pump system utilizing the phase change of the working medium to absorb heat is provided to solve the problems.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a deep well heat exchange heat pump system utilizing working medium phase change to absorb heat, which has the advantage of good heat exchange effect and solves the problems of single structure, low heat exchange power and the like of the existing buried pipe heat exchange system and can not achieve the expected effect.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a deep well heat exchange heat pump system utilizing working medium phase change to absorb heat comprises a buried pipe, wherein an inner pipe assembly and an outer pipe are arranged inside the buried pipe;

the inner pipe assembly comprises an inner pipe pipeline, an inner pipe is fixedly arranged inside the inner pipe pipeline, and a cavity pipeline is arranged between the inner pipe and the outer pipe.

Furthermore, the outside of buried pipe is provided with the rock layer, be provided with the backfill layer between rock layer and the buried pipe.

Further, the top of the inner pipe pipeline is fixedly connected with a compressor, the right side of the buried pipe is fixedly connected with an expansion valve, and the expansion valve is fixedly connected with the compressor through a condenser.

Further, the buried pipe is located underground, and the compressor, the expansion valve and the condenser are located on the ground.

Further, the ground pipe is arranged to be a sleeve type heat exchanger, and the compressor is arranged to be a magnetic suspension compressor.

Further, the backfill layer is internally provided with the property cement.

Further, the cavity pipelines are distributed in an annular shape.

Further, a circulating working medium is arranged inside the cavity pipeline, and the circulating working medium is R134 a.

(III) advantageous effects

Compared with the prior art, the invention provides a deep well heat exchange heat pump system utilizing phase change of working media to absorb heat, which has the following beneficial effects:

1. according to the deep well heat exchange heat pump system utilizing the phase change of the working medium to absorb heat, the circulating working medium R134a is arranged in the cavity, and according to the characteristic of low evaporation temperature of R134a, the heat absorbed by latent heat of vaporization can be utilized, the heat absorption capacity of the circulating working medium is improved, and the efficiency of the heat pump system can be effectively improved.

2. According to the deep well heat exchange heat pump system utilizing the phase change of the working medium to absorb heat, the adopted circulating working medium is R134a, and R134a has good comprehensive performance, is non-toxic and non-combustible, has good safety performance, low evaporation temperature and good gas and liquid heat conductivity.

Drawings

FIG. 1 is a schematic structural diagram of a deep well heat exchange heat pump system utilizing phase change heat absorption of a working medium according to the present invention;

in the figure: 1 ground buried pipe, 2 compressor, 3 condenser, 4 expansion valve, 5 inner pipe assembly, 51 inner pipe pipeline, 52 inner pipe, 53 cavity pipeline, 6 outer pipe, 7 backfill layer and 8 rock layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a deep well heat exchange heat pump system using phase change of working medium for absorbing heat comprises a buried pipe 1, wherein the buried pipe 1 is located underground, an inner pipe assembly 5 and an outer pipe 6 are arranged inside the buried pipe 1, a rock layer 8 is arranged outside the buried pipe 1, the rock layer 8 is located underground, a backfill layer 7 is arranged between the rock layer 8 and the buried pipe 1, and characteristic cement is arranged inside the backfill layer 7, so that the backfill layer 7 has good heat conductivity.

The buried pipe 1 is a sleeve type heat exchanger, plays a role of an evaporator in a heat pump system, can fully utilize the heat of the stratum to evaporate and absorb heat of a circulating working medium in the cavity pipeline 53, and simultaneously reduces the heat loss of the working medium in the inner pipe assembly 5.

Specifically, through setting up buried pipe 1 into double pipe heat exchanger, reached the purpose that reduces the inside heat loss of buried pipe 1, through being provided with backfill layer 7 and rock layer, play heat transfer's effect.

In this embodiment, the inner pipe assembly 5 includes an inner pipe 51, an inner pipe 52 is fixedly installed inside the inner pipe 51, a cavity 53 is disposed between the inner pipe 52 and the outer pipe 6, a circulation medium is disposed inside the cavity 53, the circulation medium is R134a, and the cavity 53 is annularly distributed, so as to facilitate circulation.

The compressor 2 is fixedly connected to the top of the inner pipe 51, the compressor 2 is a magnetic suspension compressor, an oil system is not needed for the magnetic suspension compressor, and the magnetic suspension compressor is simple and convenient to maintain, high in unit efficiency and high in efficiency and energy saving.

The right side of the buried pipe 1 is fixedly connected with an expansion valve 4, the expansion valve 4 can play a role in throttling and depressurizing a circulating working medium and adjust the flow of the circulating working medium entering an evaporator, the expansion valve 4 is fixedly connected with the compressor 2 through a condenser 3, and the compressor 2, the expansion valve 4 and the condenser 3 are all located on the ground.

The condenser 3 exchanges heat with the cooling medium, and transfers the heat absorbed by the evaporator and the heat converted by the work of the compressor to the cooling medium, thereby achieving the purpose of heating.

Specifically, the cavity pipeline 53 is arranged to achieve the purpose of heat circulation, and the circulating working medium in the cavity pipeline 53 flows.

The working principle of the above embodiment is as follows:

the deep well heat exchange heat pump system utilizing the phase change heat absorption of the working medium is characterized in that the buried pipe 1 is arranged underground, heat in a rock layer 8 is transferred to a circulating working medium arranged in a cavity pipeline 53 through a backfill layer 7 and an outer pipe 6, the temperature of the heat absorbed by the circulating working medium is increased, the heat is absorbed through phase change to form high-temperature steam after reaching a critical point, the high-temperature steam is circulated to a well head through an inner pipe pipeline 52 after reaching the well bottom, the high-temperature and high-pressure steam is converted under the action of a compressor 2, the steam then enters a condenser 3 to exchange heat with a cooling medium to provide heat for a heat supply loop, and the cooled circulating working medium is cooled, liquefied and then enters the underground buried pipe 1 again to circulate after being acted by an expansion valve 4.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.