CN103868281B - A kind of single/double stage compresses switchable tri-generation system of ground-source heat pump - Google Patents

Abstract

The invention relates to a single-stage and double-stage compression switchable ground source heat pump triple supply system, which includes a ground source side water unit, an air conditioning unit, a hot water unit and a heat exchange unit; stage compression cycle, the air conditioning unit provides saturated gaseous working fluid for the hot water unit, and the hot water unit provides throttled low-temperature liquid working fluid for the air conditioning unit, the whole system achieves double energy efficiency, and at the same time reduces the heat discharged into the soil; in winter, The hot water unit and the air conditioning unit form a parallel single-stage compression cycle, and the ground source side water unit provides low-temperature heat source for the hot water unit and the air conditioning unit at the same time; in spring and autumn, the hot water unit can also operate independently to produce hot water. The system combines the hot water unit and the air conditioning unit. The energy utilization rate of the whole system is greatly improved, and at the same time, the heat emission to the soil is reduced, which effectively solves the problem of heat accumulation in the underground soil, and makes the whole ground source heat pump system long-term efficient and Energy saving and stable operation.

Description

A Ground Source Heat Pump Triple Supply System with Switchable Single and Dual Stage Compression

technical field

The invention relates to a single-stage and double-stage compression switchable ground source heat pump triple supply system, which integrates ground source heat pump air conditioning, heating and hot water systems, and belongs to the technical field of ground source heat pump air conditioners and hot water devices.

Background technique

At present, most ground source heat pump systems in my country are independent air-conditioning systems, which are used for indoor cooling in summer and indoor heating in winter. The ground source heat pump system is idle in the spring and autumn transitional seasons, and the comprehensive utilization rate is low. The invention solves the above problems. The system can produce hot water while cooling the room in summer, and can produce hot water while heating the room in winter. It can also produce hot water in the transition season between spring and autumn.

After the ordinary ground source heat pump system has been in operation for several years, due to the unbalanced heat input/extraction from the system to the soil, heat accumulation will occur after a few years, and the operation effect will become worse and worse, and finally it will not even operate normally, especially in the Yangtze River Cold winter and hot summer areas in the south. The invention cleverly solves the above problems, ensures that the heat input/extracted from the ground source heat pump system to the soil tends to be balanced all year round, and enables the whole ground source heat pump system to operate stably, efficiently and energy-saving for a long time.

Contents of the invention

The technical problem to be solved by the present invention is: in order to overcome the problems in the prior art, provide a ground source heat pump system that can realize triple supply, realize indoor cooling in summer, heating in winter, and provide domestic hot water throughout the year, and can effectively To solve the problem of underground soil heat accumulation, a single-stage and double-stage compression switchable ground source heat pump triple supply system with long-term high efficiency, energy saving, and stable operation.

The technical solution adopted by the present invention to solve the technical problem is: a single-stage and double-stage compression switchable ground source heat pump triple supply system, which is characterized in that it includes:

A heat exchange unit, the heat exchange unit includes a multifunctional heat exchanger, a first heat exchange coil, a second heat exchange coil and a gas-liquid storage tank; the first heat exchange coil, the second heat exchange coil and the gas The liquid storage tank is placed inside the multifunctional heat exchanger, and the gas-liquid storage tank is placed in the upper space inside the multifunctional heat exchanger. The bottom of the gas-liquid storage tank is provided with holes a and e, and the top is Holes b, c, and d are respectively provided, hole a is connected to the second heat exchange coil, the other end of the second heat exchange coil protrudes from the outer wall of the multifunctional heat exchanger, hole b is connected to the second heat exchange coil The first heat exchange coil is connected, the other end of the first heat exchange coil protrudes from the outer wall of the multifunctional heat exchanger, holes c and e extend out of the multifunctional heat exchanger through copper tubes outer wall.

The ground source side water unit, the ground source side water unit includes an underground buried pipe, a water pump, a second controller and a second temperature sensing probe; the outlet of the underground buried pipe communicates with the upper part of the multifunctional heat exchanger through a water pump, The entrance of the underground buried pipe communicates with the lower part of the multifunctional heat exchanger, the second temperature sensing probe is placed in the heat preservation water tank, and the second temperature sensing probe is connected to the second controller through the insulated wire , the second controller is connected to the water pump through an insulated wire.

An air-conditioning unit, the air-conditioning unit includes a four-way reversing valve, a second compressor, an air-conditioning fan coil, a second electronic expansion valve, a second heat exchange coil, a gas-liquid storage tank, and a three-way reversing valve; The c hole on the top of the gas-liquid storage tank and the bottom e hole are respectively connected to two of the interface ports of the three-way reversing valve, and the third interface port of the three-way reversing valve is connected to the four-way reversing valve. connected to one end of the four-way reversing valve, and the other three interface ends of the four-way reversing valve are respectively connected to the suction and exhaust ends of the second compressor and the air-conditioning fan coil unit, and the other end of the air-conditioning fan coil unit is connected to the air-conditioning fan coil unit. The second electronic expansion valve is connected, the other end of the second electronic expansion valve is connected to the second heat exchange coil, the other end of the second heat exchange coil is connected to the bottom of the gas-liquid storage tank a hole connection.

A hot water unit, the hot water unit includes a first compressor, a condenser, an insulated water tank, a first electronic expansion valve, a first heat exchange coil, a gas-liquid storage tank, a first controller, and a first temperature-sensing probe; The exhaust end of the first compressor is connected to the condenser, the condenser is placed inside the heat preservation water tank, the other end of the condenser is connected to the first electronic expansion valve, and the first The other end of the electronic expansion valve is connected to the first heat exchange coil, the other end of the first heat exchange coil is connected to the hole b on the top of the gas-liquid storage tank, and the hole d on the top of the gas-liquid storage tank is The hole is connected to the suction end of the first compressor, the first temperature sensing probe is placed in the heat preservation water tank, the first temperature sensing probe is connected to the first controller through the insulated wire, The first controller is connected with the first compressor through an insulated wire.

Further, the first controller controls the opening and closing of the first compressor according to the temperature signal of the first temperature-sensing probe; °C), the first compressor works normally, and when the water temperature in the thermal insulation tank of the hot water unit is higher than the preset temperature (60 °C), the first compressor stops working.

Furthermore, the second controller controls the operation of the water pump according to the temperature signal of the second temperature-sensing probe; The "winter" gear is a constant flow high-power gear; the "summer" gear is a temperature-controlled variable flow gear. When the water temperature in the insulation water tank is lower than the preset temperature (60°C), the water pump runs at low power. When the heat preservation water tank When the water temperature is higher than the preset temperature (60°C), the water pump runs at high power; the "spring and autumn" gear is a constant flow high-power automatic start/stop gear, and when the water temperature in the heat preservation water tank is lower than the preset temperature (60°C), the pump runs Power operation, when the water temperature in the heat preservation water tank is higher than the preset temperature (60°C), the water pump will stop running. When running in winter, the second controller is adjusted to the "winter" gear; when running in summer, the second controller is switched to "summer" gear; "Spring and Autumn" file.

The beneficial effect of the present invention is that the present invention is a ground source heat pump triple supply system that can realize single-stage and double-stage compression switching, can realize air-conditioning refrigeration, heat supply, and provide domestic water throughout the year, and is especially suitable for cold winter and summer south of the Yangtze River It is used in hot areas; when the air conditioner is cooling in summer, the circulating working medium of the air conditioning unit evaporates the absorbed heat in the air conditioner fan coil, part of it is provided to the hot water unit for making hot water, and the other part is discharged into the ground through the ground source side water unit Soil, the energy utilization rate reaches the highest, the system obtains double energy efficiency, the COP reaches the maximum, and reduces excessive heat discharge into the underground soil, effectively solving the problem of underground soil heat accumulation, so that the entire ground source heat pump system can be long-term efficient, energy-saving and stable running.

Description of drawings

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

Fig. 1 is a schematic diagram of a ground source heat pump system capable of realizing triple supply according to the present invention.

In the figure: 1. Underground buried pipe; 2. Water pump; 3. The first compressor; 4. Condenser; 5. The first electronic expansion valve; 6. Insulated water tank; 7. Multifunctional heat exchanger; 8. Four-way Reversing valve; 9. Second compressor; 10. Air conditioner fan coil; 11. Second electronic expansion valve; 12. First temperature probe; 13. Second temperature probe; 14. Second heat exchange coil ; 15, the first heat exchange coil; 16, gas-liquid storage tank; 17, insulated wires; 18, the first controller; 19, the second controller; 20, three-way reversing valve.

detailed description

The present invention will be further described below in conjunction with specific examples. It should be understood that the cited examples are only used to illustrate the present invention, and are not intended to limit the scope of the present invention.

As shown in Figure 1, a ground-source heat pump combined power supply system with single and double-stage compression switchable includes:

A heat exchange unit, the heat exchange unit includes a multifunctional heat exchanger 7, a second heat exchange coil 14, a first heat exchange coil 15 and a gas-liquid storage tank 16; the second heat exchange coil 14, the first heat exchange coil 15 and the gas-liquid storage tank 16 are placed inside the multifunctional heat exchanger 7, and the gas-liquid storage tank 16 is placed in the upper space inside the multifunctional heat exchanger 7, the bottom of the gas-liquid storage tank 16 is provided with holes a and e, and the top Holes b, c, and d are respectively provided, and hole a is connected to the second heat exchange coil 14, and the other end of the second heat exchange coil 14 protrudes from the outer wall of the multifunctional heat exchanger 7, and hole b is connected to the first heat exchange coil 14. The coil pipes 15 are connected, and the other end of the first heat exchange coil pipe 15 protrudes from the outer wall of the multifunctional heat exchanger 7 , holes c and e respectively protrude from the outer wall of the multifunctional heat exchanger 7 through copper pipes.

The ground source side water unit, the ground source side water unit includes an underground buried pipe 1, a water pump 2, a second controller 19 and a second temperature sensing probe 13; the outlet of the underground buried pipe 1 passes through the upper part of the water pump 2 and the multifunctional heat exchanger 7 connected, the entrance of the underground buried pipe 1 communicates with the bottom of the multifunctional heat exchanger 7, the second temperature sensing probe 13 is placed in the heat preservation water tank 6, the second temperature sensing probe 13 is connected with the second controller 19 through an insulated wire 17, and the second temperature sensing probe 13 is connected with the second controller 19 through an insulated wire 17. The second controller 19 is connected with the water pump 2 through an insulated wire 17 .

Air conditioning unit, the air conditioning unit includes a four-way reversing valve 8, a second compressor 9, an air-conditioning fan coil 10, a second electronic expansion valve 11, a second heat exchange coil 14, a gas-liquid storage tank 16 and a three-way reversing Valve 20; the hole c on the top of the gas-liquid storage tank 16 and the hole e on the bottom are respectively connected to the ports I and III of the three-way reversing valve 20, and the port II of the three-way reversing valve 20 is connected to the port of the four-way reversing valve 8 One end is connected, the other three interface ends of the four-way reversing valve 8 are respectively connected with the suction and exhaust ends of the second compressor 9, and the air conditioner fan coil unit 10, and the other end of the air conditioner fan coil unit 10 is connected with the second electronic expansion valve 11, the other end of the second electronic expansion valve 11 is connected to the second heat exchange coil 14, and the other end of the second heat exchange coil 14 is connected to hole a at the bottom of the gas-liquid storage tank 16.

A hot water unit, the hot water unit includes a first compressor 3, a condenser 4, a heat preservation water tank 6, a first electronic expansion valve 5, a first heat exchange coil 15, a gas-liquid storage tank 16, a first controller 18 and a second A temperature-sensing probe 12; the exhaust end of the first compressor 3 is connected to the condenser 4, the condenser 4 is placed inside the heat preservation water tank 6, the other end of the condenser 4 is connected to the first electronic expansion valve 5, and the first electronic expansion valve The other end of the valve 5 is connected to the first heat exchange coil 15, the other end of the first heat exchange coil 15 is connected to the b hole on the top of the gas-liquid storage tank 16, and the d hole on the top of the gas-liquid storage tank 16 is connected to the first compressor The suction end of machine 3 is connected, and the first temperature sensing probe 12 is placed in the heat preservation water tank 6. The first temperature sensing probe 12 is connected with the first controller 18 through the insulated wire 17, and the first controller 18 is connected with the first controller 18 through the insulated wire 17. The first compressor 3 is connected.

The heat exchange unit combines the ground source side water unit, air conditioning unit and hot water unit together for heat exchange, forming a ground source heat pump triple supply system with single and double-stage compression switchable.

In a specific implementation, the first temperature-sensing probe 12 transmits the temperature signal in the thermal insulation water tank 6 to the first controller 18 through the insulated wire 17, and the first controller 18 conducts logic analysis on the received temperature signal and passes the insulation The wire 17 sends a control command to the first compressor 3; when the water temperature in the thermal insulation water tank 6 is lower than the preset temperature (60°C), the first compressor 3 works normally; when the water temperature in the thermal insulation water tank 6 is higher than the preset temperature (60°C °C), the first compressor 3 stops working.

Further, the second temperature-sensing probe 13 transmits the temperature signal in the insulated water tank 6 to the second controller 19 through the insulated wire 17, and the second controller 19 transmits the temperature signal to the water pump 2 through the insulated wire 17 after logically analyzing the received temperature signal. Issue a control command; the second controller 19 is provided with three gears of "winter", "summer" and "spring and autumn", the "winter" gear is a constant flow high-power gear; the "summer" gear is a temperature-controlled variable flow gear, when When the water temperature in the insulation water tank 6 is lower than the preset temperature (60°C), the water pump 2 runs at low power; when the water temperature in the insulation water tank 6 is higher than the preset temperature (60°C), the water pump 2 runs at high power; Constant flow and high power automatic start/stop gear, when the water temperature in the thermal insulation water tank 6 is lower than the preset temperature (60°C), the water pump 2 runs at high power, and when the water temperature in the thermal insulation water tank 6 is higher than the preset temperature (60°C), Pump 2 stops running. When running in winter, the second controller 19 is transferred to the "winter" gear; when running in summer, the second controller 19 is transferred to the "summer" gear; files.

Specific implementation methods include:

In summer use mode, the air conditioner refrigerates and produces domestic hot water at the same time; the second controller 19 is adjusted to the "summer" gear, and when the water temperature in the insulation water tank 6 is lower than the preset temperature (60°C), the first sense The temperature probe 12 transmits the temperature signal to the first controller 18 through the insulated wire 17, and the first controller 18 sends a control command to the first compressor 3 through the insulated wire 17 after logically analyzing the received temperature signal: the first compressor 3 is turned on, the second temperature sensing probe 13 in the heat preservation water tank 6 transmits the temperature signal to the second controller 19 through the insulated wire 17, and the second controller 19 performs logic analysis on the received temperature signal to the water pump 2 through the insulated wire 17. Issue a control command: the water pump 2 runs at a low power; at this time, the first compressor 3 is turned on, and the water pump 2 runs at a low power; the working process of the hot water unit: the gas working medium in the gas-liquid storage tank 16 enters the first compressor through the hole d at the top Machine 3 is compressed into superheated steam with high temperature and high pressure. The superheated steam with high temperature and high pressure enters condenser 4 to condense into liquid working fluid. The heat of condensation is used to heat the water in the thermal insulation water tank 6. The liquid working medium passes through the first electronic expansion valve section 5. After flowing into the gas-liquid two-phase working medium, the gas-liquid two-phase working medium enters the first heat exchange coil 15 and is condensed by the low-temperature water in the multifunctional heat exchanger 7 to become a supercooled liquid working medium, and the supercooled liquid working medium passes through Hole b enters the gas-liquid storage tank 16 and mixes with the original working medium in the tank, and the hot water unit works in such a reciprocating cycle; the working process of the air-conditioning unit: the saturated liquid working medium in the gas-liquid storage tank 16 enters the second replacement through the hole a at the bottom In the heat coil 14, the saturated liquid working medium is condensed by the low-temperature water in the multifunctional heat exchanger 7 to become a supercooled liquid working medium, and the supercooled liquid working medium enters the second electronic expansion valve 11, and becomes a low-temperature and low-pressure gas after throttling. Liquid two-phase working medium, the low-temperature and low-pressure gas-liquid two-phase working medium enters the air-conditioning fan coil 10 to absorb the heat of the indoor air and becomes a gaseous working medium, and the gaseous working medium is compressed by the second compressor 9 and becomes Relatively high superheated steam, the superheated steam enters the three-way reversing valve 20 (Ⅱ→Ⅲ) through the four-way reversing valve 8 to hole e, and then enters the gas-liquid storage tank 16 to fully exchange heat with the liquid working medium in the tank After the heat exchange, both the gas and liquid working medium become saturated, and the saturated liquid working medium in the gas-liquid storage tank 16 enters the second heat exchange coil 14 through the hole a at the bottom, and the air conditioning unit operates in such a reciprocating cycle; this operation mode Below, the system is a two-stage compression ground source heat pump system. The circulating working medium of the air conditioning unit evaporates in the air conditioning fan coil to absorb the heat of the indoor air. The side water unit discharges into the underground soil; at this time, the system obtains double energy efficiency, the COP reaches the maximum, and effectively reduces excessive heat discharge to the underground soil. When the water temperature in the heat preservation water tank 6 is higher than the preset temperature (60°C), the first controller 18 sends an instruction to the first compressor 3 according to the temperature signal of the first temperature sensing probe 12: the first compressor 3 stops running, The second controller 19 sends instructions to the water pump 2 according to the temperature signal of the second temperature probe 13: the water pump 2 switches from low power to high power operation; at this time, the hot water unit stops running, and the air conditioning unit continues to work normally for indoor cooling.

In winter use mode, the air conditioner supplies heat and produces hot water at the same time; the second controller 19 is adjusted to the "winter" gear, the four-way reversing valve 8 of the air-conditioning unit changes direction, and the three-way reversing valve 20 also changes direction (Ⅰ→Ⅱ) ; When the temperature of the water in the heat preservation water tank 6 is lower than the preset temperature (60°C), the first controller 18 sends an instruction to the first compressor 3 according to the temperature signal of the first temperature sensing probe 12: the first compressor 3 is turned on, The second controller 19 sends instructions to the water pump 2 according to the temperature signal of the second temperature sensing probe 13: the water pump 2 runs at high power; at this time, the first compressor 3 is turned on, and the water pump 2 runs at high power; The gas working medium in the liquid storage tank 16 enters the first compressor 3 through the hole d on the top, and is compressed into high-temperature and high-pressure superheated steam. The high-temperature and high-pressure superheated steam enters the condenser 4 to condense into a liquid working medium, and the condensation heat is used for heating and heat preservation The water and liquid working medium in the water tank 6 become a low-temperature and low-pressure gas-liquid two-phase working medium after being throttled by the first electronic expansion valve 5, and the low-temperature and low-pressure gas-liquid two-phase working medium enters the first heat exchange coil 15 to absorb more The heat of the water in the functional heat exchanger 7 turns into a gaseous working medium, and the gaseous working medium enters the gas-liquid storage tank 16 through hole b, and mixes with the gas working medium in the tank, and the hot water unit works in such a reciprocating cycle; the working process of the air conditioning unit: The gas working medium in the gas-liquid storage tank 16 enters the three-way reversing valve 20 (Ⅰ→II) through the c hole, and then enters the second compressor 9 through the four-way reversing valve 8, and is compressed into superheated steam with high temperature and high pressure. The high-pressure superheated steam enters the fan coil unit 10 of the air conditioner and condenses into a liquid working medium. The condensation heat is used for indoor heating. The low-pressure gas-liquid two-phase working medium enters the second heat exchange coil 14 to absorb the heat of the water in the multi-functional heat exchanger 7 and then becomes a gaseous working medium, and then enters the gas-liquid storage tank 16 through hole a, and is connected with the gas-liquid storage tank 16 The internal working medium is mixed, and the air conditioning unit works in such a reciprocating cycle; at this time, the hot water unit and the air conditioning unit are two parallel single-stage compression ground source heat pump systems, and the low temperature heat sources of the hot water unit and the air conditioning unit come from the ground source side Heat gained by the water unit from the subsoil. When the water temperature in the heat preservation water tank 6 is higher than the preset temperature (60°C), the first controller 18 sends an instruction to the first compressor 3 according to the temperature signal of the first temperature sensing probe 12: the first compressor 3 stops running, At this time, the hot water unit stops running, and the air conditioning unit continues to work normally to heat the room.

In the spring and autumn use mode, only hot water needs to be prepared; the second controller 19 is adjusted to the "spring and autumn" gear, and when the water temperature in the thermal insulation water tank 6 is lower than the preset temperature (60°C), the first controller 18 The temperature signal of a temperature sensing probe 12 sends an instruction to the first compressor 3: the first compressor 3 is turned on, and the second controller 19 sends an instruction to the water pump 2 according to the temperature signal of the second temperature sensing probe 13: the water pump 2 runs at high power ; At this time, the hot water unit works normally, the air conditioning unit does not work, and the working process of the hot water unit is basically the same as that of the winter hot water unit; when the water temperature in the thermal insulation water tank 6 is higher than the preset temperature (60°C), the A controller 18 sends an instruction to the first compressor 3 according to the temperature signal of the first temperature-sensing probe 12: the first compressor 3 stops running, and the second controller 19 sends an instruction to the water pump 2 according to the temperature signal of the second temperature-sensing probe 13. Command: Water pump 2 stops running.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (3)

1. single/double stage compresses a switchable tri-generation system of ground-source heat pump, it is characterized in that comprising:

Heat exchange unit, described heat exchange unit comprises multifunctional heat exchanger (7), the first heat exchange coil (15), the second heat exchange coil (14) gentle liquid storage tank (16), first heat exchange coil (15), second heat exchange coil (14) gentle liquid storage tank (16) is placed in the inside of multifunctional heat exchanger (7), and gas-liquid storage tank (16) is placed on the inner upper space of multifunctional heat exchanger (7), gas-liquid storage tank (16) bottom is provided with a and e hole, top is respectively equipped with b, c, d hole, a hole is connected with the second heat exchange coil (14), the other end of the second heat exchange coil (14) stretches out the outer wall of multifunctional heat exchanger (7), b hole is connected with the first heat exchange coil (15), the other end of the first heat exchange coil (15) stretches out the outer wall of multifunctional heat exchanger (7), the outer wall of multifunctional heat exchanger (7) is stretched out respectively by copper pipe in c and e hole,

Ground source water unit, described ground source water unit comprises underground buried tube (1), water pump (2), second controller (19) and the second temperature-sensing probe (13); Underground buried tube (1) outlet is communicated with by the top of water pump (2) with multifunctional heat exchanger (7), underground buried tube (1) entrance is communicated with the bottom of multifunctional heat exchanger (7), second temperature-sensing probe (13) is placed in attemperater (6), second temperature-sensing probe (13) is connected with second controller (19) by insulated electric conductor (17), second controller (19) is connected with water pump (2) by insulated electric conductor (17)

Air-conditioning unit, described air-conditioning unit comprises four-way change-over valve (8), the second compressor (9), coil pipe of air-conditioner blower (10), the second electric expansion valve (11), the second heat exchange coil (14), gas-liquid storage tank (16) and three-way diverter valve (20), the c hole at gas-liquid storage tank (16) top and e hole, bottom respectively with I of three-way diverter valve (20), III interface end connects, II interface end of three-way diverter valve (20) is connected with one end of four-way change-over valve (8), other three interface end of four-way change-over valve (8) respectively with the suction of the second compressor (9), exhaust end, coil pipe of air-conditioner blower (10) connects, the other end of coil pipe of air-conditioner blower (10) is connected with the second electric expansion valve (11), the other end of the second electric expansion valve (11) is connected with the second heat exchange coil (14), the other end of the second heat exchange coil (14) is connected with a hole of gas-liquid storage tank (16) bottom,

Hot water unit, described hot water unit comprises the first compressor (3), condenser (4), attemperater (6), the first electric expansion valve (5), the first heat exchange coil (15), gas-liquid storage tank (16), the first controller (18) and the first temperature-sensing probe (12), the exhaust end of the first compressor (3) is connected with condenser (4), it is inner that condenser (4) is placed in attemperater (6), the other end of condenser (4) is connected with the first electric expansion valve (5), the other end of the first electric expansion valve (5) is connected with the first heat exchange coil (15), the other end of the first heat exchange coil (15) is connected with the b hole at gas-liquid storage tank (16) top, the d hole at gas-liquid storage tank (16) top is connected with the suction end of the first compressor (3), first temperature-sensing probe (12) is placed in attemperater (6), first temperature-sensing probe (12) is connected with the first controller (18) by insulated electric conductor (17), first controller (18) is connected with the first compressor (3) by insulated electric conductor (17) again.

2. a kind of single/double stage as claimed in claim 1 compresses switchable tri-generation system of ground-source heat pump, it is characterized in that: described second controller (19) controls the operation of described water pump (2) according to the temperature signal of described second temperature-sensing probe (13), described second controller (19) is provided with " winter ", " summer ", control " spring and autumn " three gear.

3. a kind of single/double stage as claimed in claim 1 compresses switchable tri-generation system of ground-source heat pump, it is characterized in that: described first controller (18) controls the operation of described first compressor (3) according to the temperature signal of described first temperature-sensing probe (12).