Heat pump system based on low-temperature heating radiator

Abstract

The utility model discloses a heat pump system based on a low-temperature heat supply heating radiator, which comprises a heating radiator heat collecting system and a heat pump circulating system, the heating radiator heat collecting system comprises a heating radiator, a second three-way valve, a third three-way valve, a water source evaporator, a water pump, a water temperature sensor and a bypass valve; the heat pump circulating system comprises a compressor, a four-way reversing valve, an indoor heat exchanger, a first electromagnetic valve, a second electromagnetic valve, a throttling valve, a first three-way valve, an outdoor heat exchanger and a five-way valve. The heating effect is obviously improved, the temperature of the living environment is kept stable, better comfort is obtained, system operation is stable, energy is saved, one machine has multiple purposes, purchase and operation cost of user equipment is effectively reduced, maintenance and replacement of all components are more convenient, use cost and maintenance difficulty are reduced, complexity of user operation is reduced, and the energy-saving and environment-friendly effects are achieved. And the operation efficiency and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of heat pump system based on low-temperature heating radiator, belong to heat pump technical field. BACKGROUND

[0002] The existing central heating often appears the problem of indoor temperature not reaching the standard. The central heating system usually takes hot water as medium, and supplies heat to indoor through radiator or floor heating pipe network. In the traditional central heating mode, in the area far from heat source, the top floor of a building, the initial stage of heating or the case of insufficient indoor radiator heat transfer area, the problem of insufficient heating temperature usually occurs. The existing central heating supplies hot water with low temperature to family, usually about 40℃, which can meet the room heat demand for steel radiator due to good heat transfer performance, but for cast iron radiator, the problem of insufficient heat and too low temperature in the house of the user occurs. The existing radiator design is small, and the cost of transformation is large. The problem of low indoor temperature in winter heating season and low user satisfaction is also a common problem in current heating.

[0003] The existing central heating mode also has the problem of poor load regulation ability. When outdoor temperature changes, the heating capacity cannot be adjusted in time, and the problem of too high temperature in the house of the user when outdoor temperature is high and too low temperature in the house of the user when environmental temperature is low often occurs, and the thermal comfort is poor.

[0004] The heat pump system can use low-grade heat source (such as air, water or geothermal heat) to provide stable high-temperature heat source for users, which is especially suitable for the area with insufficient central heating temperature. However, the heat pump heating is significantly affected by heat source temperature. When the environment is heat source, lower environmental temperature will cause frost on the surface of heat exchanger, and the heat pump heating capacity will decrease greatly, so as to fail to meet the heat demand of users.

[0005] The existing heat pump system is independent of the central heating system, and cannot fully utilize the low-temperature waste heat resource in the central heating. When the central heating cannot meet the demand, the user can start the heat pump to supplement the heating. However, due to the low temperature of the environmental heat source, the evaporation temperature is low, the heating capacity is reduced, the operation efficiency is greatly reduced, and the user's thermal comfort is poor. Since the heat source temperature directly affects the evaporation temperature and then affects the overall performance of the heat pump, and the low environmental temperature in winter contains a low-grade heat source with low utilization value, the heating gas can be considered as the heat source of the heat pump system at this time. This heat pump that takes heat from the heating gas hot water is different from the ordinary water source heat pump. At this time, the temperature of the water source is higher, and in order to ensure the overall economy, the heating gas heating needs to be well matched, and the central heating is fully utilized, and the heat pump heating is only used for supplement. The ordinary water source heat pump can utilize the heat of 15-35℃ ground or underground water. When the heat source temperature is higher than 35℃, the problem of rising suction temperature of the compressor and reducing efficiency will occur. How to organically combine the central heating system and the heat pump system, utilize the heat pump technology to effectively compensate for the low-temperature heating and guarantee the comfort of the user has become an important research direction to solve the problem of the heating terminal. At the same time, the existing heat pump system is mostly single-function designed, and cannot meet the demand of winter heating and summer cooling at the same time. In the dual-function system, due to the complex system structure, multiple three-way valves and reversing valves are configured, which increases the maintenance difficulty and cost of the system. Therefore, a new type of heat pump system is needed to solve the shortcomings of the existing heating system, improve the indoor heating effect and energy utilization efficiency. Practical new type content

[0006] The utility model discloses a kind of heat pump systems based on low-temperature heating radiator to overcome the deficiencies of the prior art.

[0007] The technical scheme provided by the utility model is as follows: a kind of heat pump systems based on low-temperature heating radiator, it includes heat pump circulation system, it is characterized in that it further includes radiator heat collection system, radiator heat collection system includes radiator, water source evaporator, water pump, water temperature sensor and valve;Heat pump circulation system includes compressor, indoor heat exchanger, outdoor heat exchanger and valve;

[0008] The outlet of the compressor is connected with the second valve port II of the four-way reversing valve, the third valve port III of the four-way reversing valve is connected with the inlet of the indoor heat exchanger, the inlet of the indoor heat exchanger is provided with an indoor temperature sensor in front of the inlet, the outlet of the indoor heat exchanger is connected with the left valve port of the first three-way valve through a first electromagnetic valve and a throttling valve, the upper valve port of the first three-way valve is connected with the first valve port a of the five-way valve, the right valve port of the first three-way valve is connected with the inlet of the outdoor heat exchanger through a second electromagnetic valve, the outlet of the outdoor heat exchanger is connected with the second valve port b of the five-way valve, the third valve port c of the five-way valve is connected with the inlet of one path of the water source evaporator, the outlet of one path of the water source evaporator is connected with the fourth valve port d of the five-way valve, the fifth valve port e of the five-way valve is connected with the first valve port I of the four-way reversing valve, and the fourth valve port IV of the four-way reversing valve is connected with the inlet of the compressor;

[0009] The heating radiator is connected with the left valve port of the second three-way valve, the second three-way valve is connected with a return water temperature sensor, the right valve port of the second three-way valve is connected with the left valve port of the third three-way valve, the upper valve port of the second three-way valve is connected with the inlet of the water pump, the outlet of the water pump is connected with the inlet of the second path of the water source evaporator, the outlet of the second path of the water source evaporator is connected with the upper valve port of the third three-way valve, the right valve port of the third three-way valve is connected with the water outlet of the heating radiator, the upper valve port of the second three-way valve is connected with the inlet of the bypass valve, and the outlet of the bypass valve is connected with the upper valve port of the third three-way valve.

[0010] The heating radiator heat collection system and the heat pump circulation system are combined, and waste heat resources in central heating are effectively utilized.

[0011] The heat pump circulation system has excellent variable load characteristics, and the heating capacity output can be flexibly changed, so that the heating capacity output can be adjusted in real time according to the outdoor environment temperature, the indoor environment temperature is stable, and better comfort is obtained.

[0012] The water source evaporator is connected with the radiator through a water source evaporator, a four-way reversing valve, an outdoor evaporator, a three-way valve and the like, and the heat of the radiator is fully recycled, so that the water inlet temperature of the radiator and the heat dissipation to the room are not affected, and the purpose of recycling heat of the central heat source and the heat pump circulation system for heat supply is achieved.

[0013] The water source evaporator is connected with the radiator through a water source evaporator, a four-way reversing valve, an outdoor evaporator, a three-way valve and the like, and the heat of the radiator is fully recycled, so that the water inlet temperature of the radiator and the heat dissipation to the room are not affected, and the purpose of recycling heat of the central heat source and the heat pump circulation system for heat supply is achieved.

[0014] The utility model discloses not only be applicable to winter heating, through the flexible adjustment of four -way reversing valve and five -way valve, support summer refrigeration function. When summer operation, outdoor heat exchanger as condenser, indoor heat exchanger as evaporator, realize high -efficient refrigeration. Meanwhile, radiator is switched to non -working state in summer mode, ensure that system operation is stable and energy -saving. One machine multi -use, effectively reduce user equipment purchase and operating cost.

[0015] The utility model discloses cancel multiple three -way valve parts with five -way valve connecting water source evaporator, four -way reversing valve, outdoor evaporator, three -way valve and the like parts. Its compact structure is convenient for installation in existing heat supply system, and simultaneously makes the maintenance and replacement of each part more convenient, and reduces use cost and maintenance difficulty.

[0016] The utility model discloses cancel multiple three -way valve parts with five -way valve connecting water source evaporator, four -way reversing valve, outdoor evaporator, three -way valve and the like parts. Its compact structure is convenient for installation in existing heat supply system, and simultaneously makes the maintenance and replacement of each part more convenient, and reduces use cost and maintenance difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic drawing of the utility model;

[0018] Figure 2 It is the winter operation structure schematic drawing of the utility model;

[0019] Figure 3 It is the summer operation structure schematic drawing of the utility model;

[0020] Note: thick solid line represents refrigerant circulation path;

[0021] Thin solid line represents water circulation path;

[0022] The dotted line in indicates in the room, and the dotted line outside indicates in the outdoor.

[0023] In the figure: 1, compressor; 2, four-way reversing valve; 3, indoor heat exchanger; 4-1, first electromagnetic valve; 4-2, second electromagnetic valve; 5, throttling valve; 6-1, first three-way valve; 6-2, second three-way valve; 6-3, third three-way valve; 7, outdoor heat exchanger; 8, five-way valve; 9, water source evaporator; 10, water pump; 11-1, return water temperature sensor; 11-2, indoor temperature sensor; 12, radiator; 13, bypass valve. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model will be further described in detail below in combination with the drawings:

[0025] As Figure 1 shown, a heat pump system based on low-temperature heating radiator includes a radiator heat collection system and a heat pump circulation system, the radiator heat collection system includes a radiator 12, a second three-way valve 6-2, a third three-way valve 6-3, a water source evaporator 9, a water pump 10, a water temperature sensor 11, and a bypass valve 13; the heat pump circulation system includes a compressor 1, a four-way reversing valve 2, an indoor heat exchanger 3, a first electromagnetic valve 4-1, a second electromagnetic valve 4-2, a throttling valve 5, a first three-way valve 6-1, an outdoor heat exchanger 7, and a five-way valve 8.

[0026] The four-way reversing valve 2 includes four valve ports, namely a first valve port I, a second valve port II, a third valve port III, and a fourth valve port IV.

[0027] The five-way valve 8 includes five valve ports, namely a first valve port a, a second valve port b, a third valve port c, a fourth valve port d, and a fifth valve port e.

[0028] The three-way valve is indicated by "up", "down", "left", and "right" to represent the direction of the valve port, and is indicated by "left up", "left right", "right left", "up right", and "right up" to represent the communication and flow direction of two valve ports in the direction.

[0029] "Left up" indicates that the fluid medium flows into the three-way valve from the left valve port and flows out from the upper valve port.

[0030] "Left right" indicates that the fluid medium flows into the three-way valve from the left valve port and flows out from the right valve port.

[0031] "Right left" indicates that the fluid medium flows into the three-way valve from the right valve port and flows out from the left valve port.

[0032] "Up right" indicates that the fluid medium flows into the three-way valve from the upper valve port and flows out from the right valve port.

[0033] The outlet of compressor 1 is connected to the second valve port II of four-way reversing valve 2, and the third valve port III of four-way reversing valve 2 is connected to the inlet of indoor heat exchanger 3. An indoor temperature sensor 11-2 is installed before the inlet of indoor heat exchanger 3. The outlet of indoor heat exchanger 3 is connected to the inlet of first solenoid valve 4-1, the outlet of first solenoid valve 4-1 is connected to the inlet of throttle valve 5, the outlet of throttle valve 5 is connected to the left valve port of first three-way valve 6-1, and the upper valve port of first three-way valve 6-1 is connected to the first valve port a of five-way valve 8. The right valve port of the three-way valve 6-1 is connected to the inlet of the second solenoid valve 4-2. The outlet of the second solenoid valve 4-2 is connected to the inlet of the outdoor heat exchanger 7. The outlet of the outdoor heat exchanger 7 is connected to the second valve port b of the five-way valve 8. The third valve port c of the five-way valve 8 is connected to one inlet of the water source evaporator 9. One outlet of the water source evaporator 9 is connected to the fourth valve port d of the five-way valve 8. The fifth valve port e of the five-way valve 8 is connected to the first valve port I of the four-way reversing valve 2. The fourth valve port IV of the four-way reversing valve 2 is connected to the inlet of the compressor 1.

[0034] The second three-way valve 6-2 is connected to the return water temperature sensor 11-1. The right valve port of the second three-way valve 6-2 is connected to the left valve port of the third three-way valve 6-3. The left valve port of the second three-way valve 6-2 is connected to the radiator 12. The upper valve port of the second three-way valve 6-2 is connected to the inlet of the water pump 12. The outlet of the water pump 12 is connected to the two inlets of the water source evaporator 9. The two outlets of the water source evaporator 9 are connected to the upper valve port of the third three-way valve 6-3. The right valve port of the third three-way valve 6-3 is connected to the outlet of the radiator 12. The upper valve port of the second three-way valve 6-2 is connected to the inlet of the bypass valve 13. The outlet of the bypass valve 13 is connected to the upper valve port of the third three-way valve 6-3.

[0035] The specific operating method is as follows:

[0036] The operation of this utility model's heat pump system based on low-temperature heating radiators is divided into two modes: winter heating mode and summer cooling mode.

[0037] Winter Operation and Control Mode

[0038] like Figure 2 As shown, when the indoor temperature sensor 11-2 detects that the indoor temperature is higher than 20°C, the heat pump system does not operate. At this time, the upper valve of the second three-way valve 6-2 is closed, and the left and right valves of the second three-way valve 6-2 are open. The upper valve of the third three-way valve 6-3 is closed, and the left and right valves of the third three-way valve 6-3 are open. Hot water dissipates heat through the radiators, and the room is heated entirely by the radiators 12. The heat pump circulation system does not operate.

[0039] When the indoor temperature sensor 11-2 detects that the indoor temperature is lower than 20C, the heat pump cycle system runs. At this time, it is winter, and the heat pump cycle system needs to supply heat to the room. At this time, the first valve port I of the four-way reversing valve 2 is communicated with the second valve port II, and the third valve port III is communicated with the fourth valve port IV. The first valve port a of the five-way valve 8 is communicated with the third valve port c, and the fourth valve port d is communicated with the fifth valve port e. The first valve port I, the second valve port II, the third valve port III, the fourth valve port IV of the four-way reversing valve 2, the first electromagnetic valve 4-1, the throttling valve 5, the left valve of the first three-way valve 6-1, the upper valve of the first three-way valve 6-1, the first valve port a, the third valve port c, the fourth valve port d, the fifth valve port e of the five-way valve 8, the water pump 10, the left valve of the second three-way valve 6-2, the upper valve of the second three-way valve 6-2, the upper valve of the third three-way valve 6-3, and the right valve of the third three-way valve 6-3 are opened. The right valve of the first three-way valve 6-1, the second valve port b of the five-way valve 8, the right valve of the second three-way valve 6-2, and the left valve of the third three-way valve 6-3 are closed.

[0040] The opening and closing of the bypass valve 13 is determined by the return water temperature of the radiator 12. When the return water temperature sensor 11-1 detects that the radiator return water temperature is higher than 35°C, the bypass valve 13 is opened to reduce the water flow into the water source evaporator 9, thereby improving the operating efficiency of the heat pump system. When the return water temperature sensor 11-1 detects that the radiator return water temperature is lower than 35°C, the bypass valve 13 is closed.

[0041] Water circuit when the heat pump system is heating:

[0042] Hot water enters the radiator 12 inlet, after heat exchange between the radiator 12 and the room air, enters the water pump 10 through the left upper valve of the second three-way valve 6-2, enters the water source evaporator 9 through the two-way inlet of the water source evaporator 9 from the water pump 10, and exchanges heat with the refrigerant. After heat exchange, the water temperature is lowered, and the water enters the radiator 12 outlet through the upper right valve of the second three-way valve 6-3.

[0043] Refrigerant circuit when the heat pump system is heating:

[0044] Compressor 1 outputs high-temperature, high-pressure refrigerant vapor, which enters the indoor heat exchanger 3 through the fourth port IV and the third port III of the four-way reversing valve 2. At this time, the indoor heat exchanger 3 acts as a condenser. The high-temperature, high-pressure refrigerant vapor exchanges heat with the indoor air through the indoor heat exchanger 3, becoming a high-pressure, low-temperature vapor-liquid mixture. This mixture then passes through the first solenoid valve 4-1 and the throttle valve 5. Under the action of the throttle valve 5, the high-pressure, low-temperature refrigerant vapor-liquid mixture is cooled and depressurized, becoming a low-temperature, low-pressure liquid. It then enters the first port a of the five-way valve 8 through the upper left valve of the first three-way valve 6-1. The first port a of the five-way valve 8 and... The third valve port c is connected. The low-temperature, low-pressure liquid refrigerant coming out of the third valve port c of the five-way valve 8 enters the water source evaporator 9 through one inlet. After exchanging heat with the hot water, the temperature of the low-temperature, low-pressure liquid refrigerant rises and becomes high-temperature, low-pressure refrigerant vapor. The high-temperature, low-pressure refrigerant vapor enters the fourth valve port d of the five-way valve 8 through one outlet of the water source evaporator 9. The fourth valve port d of the five-way valve 8 is connected to the fifth valve port e. The high-temperature, low-pressure refrigerant vapor coming out of the fifth valve port e of the five-way valve 8 enters the first valve port I of the four-way reversing valve 2. The first valve port I of the four-way reversing valve 2 is connected to the second valve port II. The high-temperature, low-pressure refrigerant vapor coming out of the second valve port II flows into the compressor 1, and the above cycle is repeated.

[0045] Summer Operation and Control Mode

[0046] like Figure 3 As shown, it is summer, and the heat pump system needs to supply cooling to the room. During heat pump cooling, the outdoor heat exchanger 7 acts as the condenser, and the indoor heat exchanger 3 acts as the evaporator. At this time, the first valve port I of the four-way reversing valve 2 is connected to the fourth valve port IV, and the third valve port III is connected to the second valve port II. The fifth valve port e of the five-way valve 8 is connected to the second valve port b. The first valve port I, the second valve port II, the third valve port III, the fourth valve port IV of the four-way reversing valve 2, the first solenoid valve 4-1, the second solenoid valve 4-2, the throttle valve 5, the right valve of the first three-way valve 6-1, the left valve of the first three-way valve 6-1, the second valve port b of the five-way valve 8, and the fifth valve port e are open. The upper valve of the first three-way valve 6-1, the first valve port a, the third valve port c, the fourth valve port d of the five-way valve 8, the water pump 10, all valves of the second three-way valve 6-2, and all valves of the third three-way valve 6-3 are closed.

[0047] Refrigerant circuit during heat pump refrigeration:

[0048] The compressor 1 outputs high-temperature and high-pressure refrigerant steam, which enters the fourth valve port IV of the four-way reversing valve 2, and the fourth valve port IV of the four-way reversing valve 2 is communicated with the first valve port I. The high-temperature and high-pressure refrigerant steam from the first valve port I of the four-way reversing valve 2 enters the fifth valve port e of the five-way valve 8, and the fifth valve port e of the five-way valve 8 is communicated with the second valve port b. The high-temperature and high-pressure refrigerant steam from the second valve port b of the five-way valve 8 enters the outdoor heat exchanger 7, which is a condenser at this time. The high-temperature and high-pressure refrigerant steam exchanges heat with outdoor air through the outdoor heat exchanger 7 and becomes a high-pressure and low-temperature vapor-liquid mixture. The high-pressure and low-temperature vapor-liquid mixture passes through the second electromagnetic valve 4-2, the right-left valve of the first three-way valve 6-1, the throttling valve 5, and the first electromagnetic valve 4-1. Under the action of the throttling valve 5, the high-pressure and low-temperature refrigerant vapor-liquid mixture is reduced in temperature and pressure through throttling and becomes low-temperature and low-pressure liquid. The low-temperature and low-pressure liquid refrigerant enters the indoor heat exchanger 3, which is an evaporator at this time. The low-temperature and low-pressure refrigerant steam exchanges heat with indoor air through the indoor heat exchanger 3 and becomes high-temperature and low-pressure refrigerant steam. The high-temperature and low-pressure refrigerant steam enters the third valve port III of the four-way reversing valve 2, which is communicated with the second valve port II of the four-way reversing valve 2. The high-temperature and high-pressure refrigerant steam from the second valve port II of the four-way reversing valve 2 flows into the compressor 1, and the above cycle is repeated.

[0049] It should be understood that parts not described in detail in the specification are part of the prior art. The above examples only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by ordinary engineering and technical personnel in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A heat pump system based on low temperature heat supply radiators, comprising a heat pump circulation system, characterized in that It also includes a radiator heat collection system, radiator heat collection system includes radiator, water source evaporator, water pump, water temperature sensor and valve; heat pump circulation system includes compressor, indoor heat exchanger, outdoor heat exchanger and valve; The outlet of the compressor is connected with the second valve port II of the four-way reversing valve, the third valve port III of the four-way reversing valve is connected with the inlet of the indoor heat exchanger, the inlet of the indoor heat exchanger is provided with an indoor temperature sensor, the outlet of the indoor heat exchanger is connected with the left valve port of the first three-way valve through a first electromagnetic valve and a throttling valve, the upper valve port of the first three-way valve is connected with the first valve port a of the five-way valve, the right valve port of the first three-way valve is connected with the inlet of the outdoor heat exchanger through a second electromagnetic valve, the outlet of the outdoor heat exchanger is connected with the second valve port b of the five-way valve, the third valve port c of the five-way valve is connected with a one-way inlet of the water source evaporator, the one-way outlet of the water source evaporator is connected with the fourth valve port d of the five-way valve, the fifth valve port e of the five-way valve is connected with the first valve port I of the four-way reversing valve, and the fourth valve port IV of the four-way reversing valve is connected with the inlet of the compressor; The radiator is connected with the left valve port of the second three-way valve, the second three-way valve is connected with a return water temperature sensor, the right valve port of the second three-way valve is connected with the left valve port of the third three-way valve, the upper valve port of the second three-way valve is connected with the inlet of the water pump, the outlet of the water pump is connected with a two-way inlet of the water source evaporator, the two-way outlet of the water source evaporator is connected with the upper valve port of the third three-way valve, the right valve port of the third three-way valve is connected with the water outlet of the radiator, the upper valve port of the second three-way valve is connected with the inlet of a bypass valve, and the outlet of the bypass valve is connected with the upper valve port of the third three-way valve.

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