CN113587492B - Ground source heat pump with redundant heat source selection and convenient maintenance - Google Patents

Abstract

The invention discloses a ground source heat pump with redundant heat source selection and convenient maintenance, which comprises a four-way reversing valve, a heat pump compressor, a user side heat exchanger, a throttle valve, a data acquisition module and a ground source side heat exchanger with a heat source selection function, wherein the four-way reversing valve is connected with the heat pump compressor; the data acquisition module acquires operation data; the four-way reversing valve is connected with two ends of the heat pump compressor, the user side heat exchanger and the ground source side heat exchanger, and the ground source side heat exchanger is connected with the user side heat exchanger through the throttle valve; the ground source side heat exchanger is composed of a plurality of heat exchange modules, each heat exchange module comprises a branched inner pipe and an outer cavity wrapping the inner pipe, the branched inner pipes can be used for circulating a circulating medium, and the space between the outer cavities and the inner pipes can be used for heat source liquid to flow. The ground source side heat exchanger is improved to be capable of being connected with the main heat source and the standby heat source at the same time, so that the purpose of selecting and switching the heat sources is achieved, and meanwhile, due to the relative independence of the heat exchange modules, the ground source side heat exchanger can be isolated from the heat exchanger to be maintained and replaced, and the ground source side heat exchanger is more convenient.

Description

A ground source heat pump with redundant heat source selection and easy maintenance

technical field

The invention relates to the field of ground source heat pumps, in particular to a ground source heat pump with redundant heat source selection and easy maintenance.

Background technique

The cold and heat of the ground source heat pump system comes from the rock and soil layer with relatively constant temperature conditions, and the energy efficiency ratio (COP) value of the unit is kept above 4, that is, the cooling or heat of about 4kW can be obtained by consuming 1kW of high-grade electric energy, and the operating efficiency Extremely high; under cooling conditions, compared with ordinary central air-conditioning systems, the ground source heat pump air-conditioning system can save energy by 30% to 40%; under heating conditions, compared with gas-fired boiler floor heating, it can save energy by 40% to 50%, saving energy and reducing emissions significantly.

A "ground source heat pump system" disclosed in Chinese patent literature, its publication number is CN112361658A, and the publication date is 2021-02-12, which includes a heat exchange tube group, a first circulation pump, a ground source heat pump unit, a water heater, a disc pipe and the second circulation pump, the heat exchange tube group is buried in the soil and connected to the first circulation pump through the first water pipe, the first circulation pump is connected to the ground source heat pump unit through the first branch pipe, and the ground source heat pump unit is connected to the ground source heat pump unit through the second water pipe It is connected to the water inlet end of the coil, and the coil is pre-buried in the building room. The water outlet of the coil is connected to the second circulation pump through the second branch pipe, and the second circulation pump is connected to the heat exchange tube group through the return pipe. This invention can effectively improve the effect of indoor heating, but its heat source is single. When the heat source is not conducive to the operation of the ground source heat pump, the heat source cannot be changed. At the same time, the operation status cannot be monitored in real time, which is not conducive to the detection of system pipeline failures.

Contents of the invention

The purpose of the present invention is to overcome the problem that the heat source selection of the ground source heat pump is too single in the prior art, which affects the working stability and efficiency, and the problem of inconvenient detection, maintenance and replacement of parts, and provides a ground source heat pump with redundant heat source selection and easy maintenance. Source heat pump, by optimizing and improving the heat exchanger on the ground source side, it is connected to the main heat source cycle and the backup heat source cycle at the same time, so that the heat source selection and switching of the ground source heat pump can be achieved; in addition, by adding data collection devices and solenoid valves And other configurations, real-time monitoring of the operating status and control of the ground source heat pump operation and heat source switching, to facilitate the maintenance and replacement of relevant personnel.

In order to achieve the above object, the present invention adopts the following technical solutions:

A ground source heat pump with redundant heat source selection and easy maintenance, characterized in that it includes a data acquisition module and a ground source side heat exchanger; the data acquisition module collects the operating data of the ground source heat pump; the ground side heat exchanger The heat exchanger has a heat source selection function, the ground-side heat exchanger is connected to a four-way reversing valve, and the four-way reversing valve is also connected to both ends of the heat pump compressor and the user-side heat exchanger; the ground-source side heat exchanger and The heat exchanger on the user side is connected through a throttling valve; the heat exchanger on the ground source side is composed of multiple heat exchange modules, each heat exchange module includes an inner tube and an outer cavity that wraps the inner tube, and the inner tube is branched The two ends of the inner tube are equipped with solenoid valves; the space between the outer cavity and the inner tube can be used for the flow of heat source liquid, and each input of the outer cavity The output interfaces are equipped with solenoid valves.

In the present invention, the four-way reversing valve is used to change the pipeline path so as to switch between the cooling and heating working states of the ground source heat pump; the heat pump compressor is used to compress the circulating medium, thereby increasing the circulating medium passing through the heat pump compressor. pressure and temperature, and provide circulation power for the medium; the user-side heat exchanger is used for the heat exchange between the circulating gas and the room, and the cooling or heating effect of the room can be achieved through the heat absorption or heat release of the circulating gas; the throttle valve is also called The expansion valve can play the role of throttling and reducing pressure and regulating flow. The data acquisition module can collect and organize the operation data of the ground source heat pump, and provide data support for inspection and maintenance and judgment of the operation status of the heat pump. The heat exchanger on the ground source side performs heat exchange between the circulating medium and the heat source liquid, and can also switch the heat source and select different heat sources for work.

As a preference, the branched inner pipe is a network pipe formed by criss-crossing several horizontal pipes and several vertical pipes; the input end of the network pipe is the circulating medium input pipe of the branched inner pipe, and the output end of the network pipe is a branch The circulating medium output pipe of the inner pipe.

As a preference, the outer cavity wraps the inner tube and leaves a space for the heat source liquid to flow; one end of the outer cavity is connected to the circulating medium input pipe of the inner tube in a waterproof and sealed manner, and the first output interface and the second output interface are distributed around it. Output interface; the other end of the outer cavity is connected with the circulating medium output pipe of the inner tube in a waterproof and sealed manner, and there are No. 3 input ports and No. 4 input ports around them.

A single heat exchange module consists of an inner tube with a branched structure and an outer cavity that wraps the inner tube. The inner tube adopts a branched structure, which can increase the heat exchange area between the circulating medium and the heat source liquid, and improve the heat exchange efficiency; The cavity wraps the inner tube according to the outline of the inner tube, and has the same distance as the gap between the inner tubes, so that the heat source liquid can completely cover the surface of the entire inner tube when flowing in the gap between the inner tube and the outer cavity, increasing the effective heat exchange area and improving heat exchange effect. In addition, the two ends of the outer chamber are respectively connected with the input pipe and the outlet pipe of the inner pipe in a waterproof seal, which can prevent the leakage of the heat source liquid, and also can fix the positions of the outer chamber and the inner pipe to form a complete heat exchange module. Regarding the layout of the output interface and the input interface, the No. 1 output interface and the No. 3 input interface can be located on the opposite side of the outer cavity, and the No. 2 output interface and No. 4 input interface can be located on the opposite side of the outer cavity, so that the circulation of the heat source liquid More fluid.

Preferably, the circulation medium input pipes of all the inner pipes in the ground-source side heat exchanger are connected in parallel to the total circulation medium inlet; the circulation medium output pipes of all the inner pipes are connected in parallel to the total circulation medium outlet.

After the circulation medium flows in from the total circulation medium inlet, it can be distributed to the circulation medium input pipe of each heat exchange module, so that heat exchange can be performed simultaneously in multiple heat exchange modules, and the speed of heat exchange can be increased, and then output from each circulation medium The pipes are collected to the outlet of the total circulating medium to continue the circulation. At the same time, since electromagnetic valves are installed at the input and output interfaces of the heat exchange modules, it is possible to close the electromagnetic valves at the interfaces of some heat exchange modules, so that some heat exchange modules do not work, and the rest continue to perform heat exchange work. In this way, the ground source heat pump can still perform indoor cooling or heating operations when relevant personnel are performing inspection and maintenance work on the ground source heat pump. At the same time, the relative independence of the heat exchange module can also facilitate relevant personnel to perform maintenance on specific parts. And replacement, more convenient.

As a preference, the No. 1 output interfaces of all external chambers in the ground source side heat exchanger are connected in parallel to the No. 1 heat source liquid general interface; the No. 2 output interfaces of all external chambers are connected in parallel to the No. 2 heat source liquid general interface; The No. 3 input interface of the cavity is connected in parallel to the No. 3 heat source liquid main interface; the No. 4 input interface of all external chambers is connected in parallel to the No. 4 heat source liquid main interface.

In all the heat exchange modules of the ground source side heat exchanger, the connection mode of all the input and output interfaces of the outer chamber is the same as that of the inner tube, and they are connected in parallel to the No. 1 heat source liquid general interface, the No. 2 heat source liquid general No. heat source liquid general interface and No. 4 heat source liquid general interface. When you want to stop the work of a certain part of the heat exchange module, while closing the electronic valve at the input and output ports of the inner tube, you can continue to close the solenoid valve between the input and output ports of the outer cavity and the general inlet and outlet of the heat source liquid, so as to replace this part. The thermal module is isolated from the entire ground-source side heat exchanger, and subsequent operations on this part of the heat exchange module will not affect the entire ground-source side heat exchanger. This enables the ground source side heat exchanger to be repaired and replaced while it is working.

As a preference, in the ground source side heat exchanger, the No. 1 heat source liquid main interface and the No. 3 heat source liquid main interface are connected to the main heat source for circulation; the No. 2 heat source liquid main interface and the No. 4 heat source liquid main interface are connected to the backup heat source for circulation .

When switching the heat source, turn on the solenoid valves of No. 1 and No. 3 heat source liquid main interfaces, and close the solenoid valves of No. 2 and No. 4 heat source liquid main interfaces to make the heat exchanger connect to the main heat source for circulation; close No. 1 and No. 3 The solenoid valve of the heat source liquid main interface, and the solenoid valve of the No. 2 and No. 4 heat source liquid main interface can make the heat exchanger communicate with the standby heat source for circulation.

Preferably, the data acquisition module includes a temperature sensor, a flow sensor and an electric energy meter. A temperature sensor and a flow sensor form a temperature and flow detection component, which are respectively connected to the input port and output port of the heat exchanger on the user side and the input port and output port of the heat exchanger on the ground source side to detect circulating medium and heat source liquid Input and output temperature and flow, judge the working status of the heat pump and the parts that may have problems according to the data changes; the electric energy meter is connected to the heat pump compressor, the main heat source water pump and the backup heat source water pump respectively, and measures the power consumed by them as a calculation of energy efficiency ratio basis for judgment.

Preferably, the ground source heat pump further includes a control center, which automatically analyzes working data, controls the switching of cooling and heating modes, controls the selection of heat sources, and can also isolate the heat exchange module by controlling the on and off of the solenoid valve.

The control center controls the on-off of the solenoid valve, and through the on-off of the solenoid valve, the heat exchanger on the ground source side is connected to the main heat source or connected to the backup heat source to achieve the purpose of heat source selection. In addition, the control center compares and analyzes the data of the data acquisition module with the preset standard threshold to judge the working status of the ground source heat pump and the operation of each part, so as to facilitate the maintenance and repair of the ground source heat pump by relevant personnel.

The invention has the following beneficial effects: through the optimization and improvement of the heat exchange module in the ground source side heat exchanger, the inner tube with a branched structure and the outer cavity connecting the main heat source and the backup heat source at the same time make the ground source side heat exchanger It has the function of heat source selection; through the solenoid valve set at the input and output interface of the heat exchange module, the switching of the heat source can be flexibly controlled by the opening and closing of the solenoid valve; thermometers, flow meters and electric energy meters are installed in the system to collect real-time system operation The data can be used to judge the working status, which is conducive to equipment maintenance; the ground source side heat exchanger is composed of multiple relatively independent heat exchange modules connected in parallel, and some modules are isolated from the heat exchanger by closing the solenoid valve, which can not only work in the heat pump It is also convenient to perform maintenance and other operations on this part of the modules, and it is also convenient to replace the heat exchange modules.

Description of drawings

Fig. 1 is a schematic diagram of the heat exchange unit of the ground source side heat exchanger in the present invention;

Fig. 2 is a side view of the heat exchange unit of the ground source side heat exchanger in the present invention;

Fig. 3 is the schematic diagram of ground source side heat exchanger in the present invention;

Fig. 4 is a schematic diagram of the ground source heat pump cooling mode of the present invention;

Fig. 5 is a schematic diagram of the heating mode of the ground source heat pump of the present invention;

In the figure: 1. User side heat exchanger; 2. Four-way reversing valve; 3. Heat pump compressor; 4. Ground source side heat exchanger; 5. Throttle valve; 6. Temperature flow detection component; 7. Electric energy Table; 8. Solenoid valve; 9. Heat exchange module; 10. Water pump; 41. Inlet of total circulating medium; 42. Outlet of total circulating medium; 43. General interface of No. 1 heat source liquid; 44. General interface of No. 4 heat source liquid; 45 , No. 2 heat source liquid main interface; 46, No. 3 heat source liquid main interface; 91, circulating medium input pipe; 92, circulating medium output pipe; 93, No. 1 output interface; 94, No. 2 output interface; 95, No. 4 output Interface; 96, No. 3 output interface; 97, outer chamber; 98, inner pipe; 981, horizontal pipe; 982, vertical pipe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 3, a ground source heat pump with redundant heat source selection and easy maintenance includes a four-way reversing valve, a heat pump compressor, a user-side heat exchanger and a throttle valve, and also includes a data acquisition module and a heat source The ground source side heat exchanger with optional function; the data acquisition module collects the operation data of the ground source heat pump; the four-way reversing valve is respectively connected to both ends of the heat pump compressor, the user side heat exchanger and the ground source side heat The heat exchanger and the heat exchanger on the user side are connected through a throttling valve; the heat exchanger on the ground source side is composed of multiple heat exchange modules, and each heat exchange module contains a branched inner tube and an outer cavity that wraps the inner tube. The inner tube can be circulated by the circulating medium, and the two ends of the inner tube are equipped with electromagnetic valves; the space between the cavity and the inner tube can be used for the flow of heat source liquid, and each input and output interface of the outer cavity is equipped with electromagnetic valves. valve.

As shown in Figure 1, the branched inner pipe is a network pipe formed by crisscrossing six horizontal pipes and six vertical pipes; the input end of the network pipe is the circulating medium input pipe of the branched inner pipe, and the output end of the network pipe is a branched pipe. Circulating medium output pipe of the inner pipe. The outer chamber wraps the inner pipe and the distance between the two is the same, leaving space for the heat source liquid to flow. One end of the outer chamber is connected with the circulating medium input pipe of the inner pipe in a waterproof and sealed manner. Output interface; the other end is connected with the circulating medium output pipe of the inner pipe in a waterproof and sealed manner, and there are No. 3 input ports and No. 4 input ports distributed on the left and right sides.

As shown in Figure 2, the circulation medium input pipes of all inner pipes in the ground source side heat exchanger are connected in parallel to the total circulation medium inlet; the circulation medium output pipes of all inner pipes are connected in parallel to the total circulation medium outlet. The No. 1 output ports of all external chambers in the ground source side heat exchanger are connected in parallel to the No. 1 heat source liquid general port; the No. 2 output ports of all external chambers are connected in parallel to the No. 2 heat source liquid general port; The interfaces are all connected in parallel to the general interface of No. 3 heat source liquid; the No. 4 input interfaces of all external chambers are connected in parallel to the general interface of No. 4 heat source liquid. In the heat exchanger on the ground source side, the No. 1 heat source liquid main interface and No. 3 heat source liquid main interface are connected to the main heat source for circulation; the No. 2 heat source liquid main interface and No. 4 heat source liquid main interface are connected to the backup heat source for circulation.

The data acquisition module also includes a temperature sensor, a flow sensor and a power meter. A temperature sensor and a flow sensor form a temperature and flow detection component, which are respectively connected to the input port and output port of the heat exchanger on the user side and the input port and output port of the heat exchanger on the ground source side to detect circulating medium and heat source liquid Input and output temperature and flow, judge the working status of the heat pump and the parts that may have problems according to the data changes; the electric energy meter is connected to the heat pump compressor, the main heat source water pump and the backup heat source water pump respectively, and measures the power consumed by them as a calculation of energy efficiency ratio basis for judgment.

The ground source heat pump also includes a control center, which automatically analyzes working data, controls the switching of cooling and heating modes, controls the selection of heat sources, and can also isolate the heat exchange module by controlling the on and off of the solenoid valve, which is convenient for maintenance and replacement. The control center controls the on-off of the solenoid valve, and through the on-off of the solenoid valve, the heat exchanger on the ground source side is connected to the main heat source or connected to the backup heat source to achieve the purpose of heat source selection. In addition, the control center compares and analyzes the data of the data acquisition module with the preset standard threshold to judge the working status of the ground source heat pump and the operation of each part, so as to facilitate the maintenance and repair of the ground source heat pump by relevant personnel.

In the present invention, the four-way reversing valve is used to change the pipeline path so as to switch between the cooling and heating working states of the ground source heat pump; the heat pump compressor is used to compress the circulating medium, thereby increasing the circulating medium passing through the heat pump compressor. pressure and temperature, and provide circulation power for the medium; the user-side heat exchanger is used for the heat exchange between the circulating gas and the room, and the cooling or heating effect of the room can be achieved through the heat absorption or heat release of the circulating gas; the throttle valve is also called The expansion valve can play the role of throttling and reducing pressure and regulating flow. The data acquisition module collects and organizes the operation data of the ground source heat pump, and provides data support for inspection and maintenance and judgment of the operation status of the heat pump.

The ground source side heat exchanger with heat source selection function is an important part of the present invention, which can control the heat exchange of the main heat source liquid circulation or the backup heat source liquid circulation heat exchange through the on-off of the solenoid valve installed at each interface . At the same time, because the ground-source side heat exchanger is composed of multiple heat exchange modules, some of the heat exchange modules can be operated by switching on and off the solenoid valve, and the rest of the heat exchange modules can not work or be maintained; The heat module performs the main heat source circulation, and some heat exchange modules perform the backup heat source circulation; this makes the heat source selection of the heat exchanger more flexible, and will not affect the performance of the ground source heat pump due to a single heat source problem, and can also adjust two heat sources when necessary. The circulation ratio of the heat source improves the working efficiency of the ground source heat pump.

A single heat exchange module is composed of an inner tube with a branched structure and an outer cavity that wraps the inner tube. The inner tube adopts a branched structure, which can increase the heat exchange area between the circulating medium and the heat source liquid, and improve the heat exchange efficiency; The cavity wraps the inner tube according to the outline of the inner tube, and has the same distance as the gap between the inner tubes, so that the heat source liquid can completely cover the surface of the entire inner tube when flowing in the gap between the inner tube and the outer cavity, increasing the effective heat exchange area and improving heat exchange effect. In addition, the two ends of the outer chamber are respectively connected with the input pipe and the outlet pipe of the inner pipe in a waterproof seal, which not only prevents the leakage of the heat source liquid, but also fixes the positions of the outer chamber and the inner pipe to form a complete heat exchange module. Regarding the layout of the output interface and the input interface, the No. 1 output interface and the No. 3 input interface can be located on the opposite side of the outer cavity, and the No. 2 output interface and No. 4 input interface can be located on the opposite side of the outer cavity, so that the circulation of the heat source liquid More fluid.

After the circulating medium flows in from the total circulating medium inlet, it can be distributed to the circulating medium input pipe of each heat exchange module, so that heat exchange can be performed in multiple heat exchange modules at the same time, and the speed of heat exchange can be increased, and then output from each circulating medium The pipes are collected to the outlet of the total circulating medium to continue the circulation. At the same time, since electromagnetic valves are installed at the input and output interfaces of the heat exchange modules, it is possible to close the electromagnetic valves at the interfaces of some heat exchange modules, so that some heat exchange modules do not work, and the rest continue to perform heat exchange work. This method enables the relevant personnel to perform maintenance work on the ground source heat pump, while the ground source heat pump can still perform indoor cooling or heating operations. At the same time, the relative independence of the heat exchange module can also facilitate relevant personnel to perform maintenance on specific parts. And replacement, more convenient.

In all the heat exchange modules of the ground source side heat exchanger, the connection mode of all the input and output interfaces of the outer chamber is the same as that of the inner tube, and they are connected in parallel to the No. 1 heat source liquid general interface, the No. 2 heat source liquid general No. heat source liquid general interface and No. 4 heat source liquid general interface. When you want to stop the work of a certain part of the heat exchange module, while closing the electronic valve at the input and output ports of the inner tube, you can continue to close the solenoid valve between the input and output ports of the outer cavity and the general inlet and outlet of the heat source liquid, so as to replace this part. The thermal module is isolated from the entire ground-source side heat exchanger, and subsequent operations on this part of the heat exchange module will not affect the entire ground-source side heat exchanger. This enables the ground source side heat exchanger to be repaired and replaced while it is working.

When the main heat source is used for heat exchange work, the heat source liquid flows into and out of the heat exchanger on the ground source side through the No. 1 heat source liquid main interface and No. 3 heat source liquid main interface after the main heat source releases heat or absorbs heat, and then returns to the main heat source; When the standby heat source is used for heat exchange, the heat source liquid flows into and out of the heat exchanger on the ground source side through the No. 2 heat source liquid main interface and the No. 4 heat source liquid main interface after the standby heat source releases or absorbs heat, and then returns to the standby heat source. When switching the heat source, turn on the solenoid valves of the No. 1 and No. 3 heat source liquid main interfaces, close the solenoid valves of the No. 2 and No. 4 heat source liquid main interfaces to make the heat exchanger connect to the main heat source for circulation; turn off No. 1 and No. 3 heat sources The solenoid valve of the main liquid interface is connected to the solenoid valve of the liquid main interface of No. 2 and No. 4 heat sources, so that the heat exchanger is connected to the backup heat source for circulation.

The refrigeration mode of the ground source heat pump in the present invention is shown in Figure 3, and its process is: user-side heat exchanger (the circulating medium evaporates and absorbs heat in the room) - four-way reversing valve - heat pump compressor (compresses to increase the temperature and pressure of the circulating medium )—four-way reversing valve—ground source side heat exchanger (the circulating medium and the heat source liquid conduct sufficient heat exchange, the circulating medium releases heat, and the heat source liquid absorbs heat)—throttle valve (throttling and reducing pressure)—user side heat exchange device (the circulating medium continues to absorb heat).

The heating mode of the ground source heat pump in the present invention is shown in Figure 4, and the process is: ground source side heat exchanger (circulation medium and heat source liquid heat exchange, circulation medium absorbs heat, heat source liquid releases heat) - four-way reversing valve —Heat pump compressor (compression increases the temperature and pressure of the circulating medium)—Four-way reversing valve—User-side heat exchanger (circulating medium dissipates heat to increase indoor temperature)—Throttle valve (throttling and reducing pressure)—Ground source side heat exchanger (The circulating medium continues to absorb heat).

In the embodiment of the present invention, a closed circulation method is adopted, and water is used as the main heat source and the heat source liquid in the backup heat source carries heat to circulate between the heat source and the ground source side heat exchanger. Among them, the main heat source adopts the direct buried type, which occupies a small area, and the position of the heat source is relatively deep from the ground, and the surrounding of the heat source is stable; the backup heat source adopts the method of horizontal buried pipe, which is relatively close to the ground, and it is more convenient to carry out follow-up operations after installation. It is conducive to the adoption and replacement of other backup heat sources; the backup heat source can also use surface water such as flowing river water, lake water, groundwater, etc., which is suitable for users with abundant water resources as the choice of backup heat source.

The following is a further description of how the ground source heat pump in the present invention can be overhauled while working and running. Taking the ground source heat pump refrigeration mode as an example, it performs user-side heat exchanger-four-way reversing valve-heat pump compressor-four-way switching Direction valve-ground source side heat exchanger-throttle valve-user side heat exchanger cycle.

When the part of the heat exchanger on the ground source side is analyzed to be faulty or when maintenance personnel want to maintain and replace the heat exchanger on the ground source side, since the heat exchanger on the ground source side is composed of multiple heat exchange modules, the heat exchange modules can be divided into The first group, the second group and the third group take turns to detect. In the initial state, the first group, the second group and the third group of heat exchange modules are all in working state. Firstly, by closing the solenoid valves of all interfaces of the first group of heat exchange modules, the first group of heat exchange modules is removed from the heat exchanger. Isolate and repair or replace the heat exchange modules of the first group. At the same time, the second and third heat exchange modules are still working to cool the ground source heat pump; the maintenance of the first group of heat exchange modules is completed Finally, turn on the solenoid valve again to connect the first group of heat exchange modules into the heat exchanger, isolate the second group of heat exchange modules from the heat exchanger, and repair and replace the second group of heat exchange modules; the same as before , turn on the solenoid valves of the second group of heat exchange modules, close the solenoid valves of the third group of heat exchange modules, and perform maintenance and replacement of the third group of heat exchange modules. After the whole process, the repair and replacement of the ground source side heat exchanger is completed.

When there is no problem with the heat exchanger on the ground source side, maintenance personnel can carry a cabinet with the same functions as the heat exchanger on the user side, four-way reversing valve, heat pump compressor and throttle valve, and replace the user's ground source heat pump system The inlet and outlet of the total circulation medium of the heat exchanger on the ground source side are isolated from the system through a solenoid valve, and then connected to the cabinet carried by the maintenance personnel, so that the cabinet and the heat exchanger on the ground source side form a temporary ground source heat pump to cool the room. At the same time, maintenance personnel can repair and replace the original problematic ground source heat pump system.

During the initial cooling mode, the ground source heat pump uses the directly buried main heat source as the heat release object, and the standby heat pump is in a standby state. When a problem is detected in the direct buried pipeline in the main heat source or the maintenance personnel have to repair When the heat source pipeline is overhauled, close all the solenoid valves between the main heat source and the heat exchanger on the ground source side (that is, all the solenoid valves on the No. The road is isolated from the ground source heat pump system, and at the same time, the solenoid valve between the backup heat source and the ground source side heat exchanger (that is, all the solenoid valves on the second heat source liquid general interface and the third heat source liquid general interface) is turned on, and the standby heat source The pipeline is connected to the ground source heat pump system. In the cooling mode at this time, the ground source heat pump uses the backup heat source as the heat release object and can still work. The maintenance personnel can also overhaul the main heat source pipeline at the same time, which will not affect the refrigeration working state of the ground source heat pump.

The above-mentioned embodiments are specific illustrations and descriptions of the present invention, which are easy to understand and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the present invention. within the scope of protection.

Claims (5)

1. A ground source heat pump with redundant heat source selection and convenient maintenance is characterized by comprising a data acquisition module and a ground source side heat exchanger; the data acquisition module acquires the operation data of the ground source heat pump; the ground source side heat exchanger has a heat source selection function, is connected with a four-way reversing valve, and is also connected with two ends of a heat pump compressor and a user side heat exchanger; the ground source side heat exchanger is connected with the user side heat exchanger through a throttle valve;

in the ground source side heat exchanger, a first heat source liquid main interface and a third heat source liquid main interface are connected with a main heat source for circulation; the second heat source liquid main interface and the fourth heat source liquid main interface are connected with a standby heat source for circulation; the ground source side heat exchanger consists of a plurality of heat exchange modules, and each heat exchange module comprises an inner pipe and an outer cavity wrapping the inner pipe;

the first output interfaces of all the outer cavities are connected in parallel to the first heat source liquid main interface; all the second output interfaces of the outer cavities are connected in parallel to the second heat source liquid main interface; all the third input interfaces of the outer cavities are connected in parallel to the third heat source liquid main interface; all the fourth input interfaces of the outer cavity are connected in parallel to the fourth heat source liquid main interface;

the inner pipe is branched and can be used for circulating a medium, and the interfaces at the two ends of the inner pipe are provided with electromagnetic valves; the space between the outer cavity and the inner tube can be used for heat source liquid to flow, and each input/output interface of the outer cavity is provided with an electromagnetic valve; by switching on and off the electromagnetic valve, part of the heat exchange modules work, and the rest of the heat exchange modules do not work or are maintained; meanwhile, a part of heat exchange modules can perform main heat source circulation, and a part of heat exchange modules perform standby heat source circulation, so that the circulation ratio of the two heat sources is adjusted to improve the working efficiency of the ground source heat pump;

the branched inner pipe is a net pipe formed by a plurality of transverse pipes and a plurality of vertical pipes in a criss-cross manner; the input end of the mesh pipe is a branched circulating medium input pipe of the inner pipe, and the output end of the mesh pipe is a branched circulating medium output pipe of the inner pipe; the outer cavity covers the inner pipe and a space for heat source liquid to flow is reserved;

in the ground source side heat exchanger, each heat exchange module is relatively independent, and the input and output interfaces of the heat exchange modules are provided with electromagnetic valves.

2. The ground source heat pump with redundant heat source selection and convenient maintenance as claimed in claim 1, wherein one end of the outer cavity is connected with the circulating medium input pipe of the inner pipe in a waterproof and sealed manner, and a first output interface and a second output interface are distributed around the outer cavity; the other end of the outer cavity is connected with a circulating medium output pipe of the inner pipe in a waterproof and sealed mode, and a third input interface and a fourth input interface are distributed on the periphery of the outer cavity.

3. The ground source heat pump with redundant heat source selection and convenient maintenance as claimed in claim 1, characterized in that the circulating medium input pipes of all inner pipes in the ground source side heat exchanger are connected in parallel to the total circulating medium inlet; the circulating medium output pipes of all the inner pipes are connected in parallel to the total circulating medium outlet.

4. The ground source heat pump with redundant heat source selection and convenient maintenance as claimed in claim 1, wherein the data acquisition module comprises temperature sensors for measuring the working temperature everywhere; the flow sensor is used for measuring the flow of the circulating medium and the heat source liquid; and the electric energy meter is used for measuring the power consumption of the ground source heat pump.

5. The ground source heat pump with redundant heat source selection and convenient maintenance as claimed in claim 1, further comprising a control center, wherein the control center automatically analyzes the working data, controls the switching of the cooling and heating modes, controls the selection of the heat source, and can also isolate the heat exchange module by controlling the on/off of the solenoid valve.

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