Energy-saving air source heat pump refrigerating and heating system

Abstract

The utility model relates to the technical field of heat pumps, in particular to an energy-saving type air source heat pump refrigerating and heating system, which aims to solve the technical problems of lack of linkage and poor energy-saving effect between an air source heat pump and air disc equipment at the tail end in the prior art, and specifically comprises a temperature changing unit, an output unit, a control unit and a connecting pipeline, the connecting pipeline is arranged between the temperature changing unit and the output unit, the temperature changing unit comprises a plurality of heat pumps, a water outlet main pipe and a water return main pipe, the water outlet main pipe is connected with a water outlet pipe of each heat pump, and the water return main pipe is connected with a water return pipe of each heat pump; according to the utility model, through real-time communication between the central controller and the wind disc controller as well as the heat pump controller, the system can accurately sense the use state and the number of the wind discs at the tail end, so that the start-stop and refrigeration / heating modes of the heat pump are intelligently adjusted, the heat pump is effectively prevented from running under low-efficiency or invalid working conditions, and the overall energy efficiency of the system is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to an energy-saving air-source heat pump refrigeration and heating system. Background Technique

[0002] An air-source heat pump (hereinafter referred to as a heat pump for short) is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source (i.e., air) to a high-level heat source, and belongs to a form of heat pump. This technology uses the reverse Carnot principle to absorb the low-temperature heat energy in the air with very little electric energy, compress it into high-temperature heat energy through a compressor, and then transmit it to the medium to be heated (such as water in a water tank), so as to achieve energy-saving, efficient, fast, safe and environmentally friendly heating or refrigeration effects.

[0003] However, in the current market applications, there is often a lack of a linkage mechanism between the heat pump and the terminal air handling unit. Even if there is a linkage, it is only limited to simple start-stop control and cannot flexibly adjust the working mode according to actual needs, bringing unnecessary complexity to the operation. Moreover, since the system cannot perceive the usage status of the terminal equipment in real time, the overall energy efficiency is difficult to optimize, and the energy-saving effect is greatly reduced.

[0004] Specifically, when an indoor user attempts to switch the working mode to heating through the air handling unit controller, due to the lack of communication between the air handling unit controller and the heat pump controller, the heat pump host may still maintain the refrigeration mode operation, which not only affects the comfort of use, but also forces the user to go out of the room and go to the heat pump controller to switch the mode, greatly reducing the user experience.

[0005] In addition, when the actual usage demand decreases and the number of activated terminal air handling units decreases, the existing air-source heat pump system often cannot respond to this change in time and continues to operate according to the preset temperature setting, resulting in unnecessary energy waste. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide an energy-saving air-source heat pump refrigeration and heating system in view of the deficiencies of the prior art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An energy-saving air-source heat pump refrigeration and heating system includes a temperature-changing unit, an output unit, a control unit and a connecting pipeline. The connecting pipeline is arranged between the temperature-changing unit and the output unit, and its characteristics are:

[0009] The temperature-changing unit includes a heat pump, a total water outlet pipe and a total water return pipe. There are several heat pumps. The total water outlet pipe is connected to the water outlet pipe of each heat pump, and the total water return pipe is connected to the water return pipe of each heat pump;

[0010] The output unit includes a fan coil unit, a first water distributor, and a first water collector. There are several fan coil units. The water distribution ports of the first water distributor are connected to the water inlet pipes of each fan coil unit, and the water collection ports of the first water collector are connected to the water outlet pipes of each fan coil unit;

[0011] The connecting pipeline includes a water supply connecting pipe and a return water connecting pipe. The two ends of the water supply connecting pipe are respectively connected to the water outlet main pipe and the first water distributor, and the two ends of the return water connecting pipe are respectively connected to the return water main pipe and the first water collector;

[0012] The control unit includes a heat pump controller, a fan coil unit controller, and a central controller. The heat pump controller is correspondingly arranged on each heat pump, the fan coil unit controller is correspondingly arranged on each fan coil unit, the central controller is communicatively connected to the heat pump controller and the fan coil unit controller respectively, and the central controller can respectively control the start-stop and refrigeration / heating mode switching of each heat pump according to the number of started fan coil units.

[0013] The technical problem to be solved by the present utility model can also be further realized through the following steps. A water supply stop valve is provided at one end of the water supply connecting pipe close to the water outlet main pipe, and a buffer water tank is provided on the water supply connecting pipe; a return water stop valve is provided at one end of the return water connecting pipe close to the return water main pipe, and a circulating water pump is provided on the return water connecting pipe.

[0014] The technical problem to be solved by the present utility model can also be further realized through the following steps. Check valves for preventing water flow back are installed on the water outlet pipe and the return water pipe of each heat pump.

[0015] The technical problem to be solved by the present utility model can also be further realized through the following steps. There are three heat pumps. The water outlet main pipe is connected to the water outlet pipes of each heat pump, and the return water main pipe is connected to the return water pipes of each heat pump.

[0016] The technical problem to be solved by the present utility model can also be further realized through the following steps. The heat pump includes a box body. An air compressor, a first heat exchanger, and a second heat exchanger are arranged in the box body. The air compressor, the first heat exchanger, and the second heat exchanger are connected by pipelines and form a loop. A mode switching valve is provided between the air compressor and the first heat exchanger, and an expansion valve is provided between the first heat exchanger and the second heat exchanger.

[0017] The technical problem to be solved by the present utility model can also be further realized through the following steps. A water supply branch pipe is connected to the water supply connecting pipe. The other end of the water supply branch pipe is provided with a second water distributor. The water distribution ports of the second water distributor are connected to a floor heating coil. The other end of the floor heating coil is connected to a second water collector. A three-way valve is provided on the return water connecting pipe. The second water collector and the three-way valve are connected for water supply through a return water branch pipe.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through the real-time communication between the central controller and the air handling unit controller and the heat pump controller, the system can accurately perceive the usage status and quantity of the terminal air handling units, thereby intelligently adjusting the start / stop and cooling / heating modes of the heat pump; users can switch the heating or cooling mode of the heat pump only through the air handling unit controller, without having to go to the heat pump controller for operation, which improves the convenience and comfort of use; at the same time, this on-demand adjustment method effectively avoids the operation of the heat pump under inefficient or ineffective working conditions, significantly improves the overall energy efficiency of the system, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present utility model;

[0021] Figure 1-2 In the figure, the arrow indicates the water flow direction;

[0022] In the figure: 1 - heat pump; 2 - main outlet pipe; 3 - main return pipe; 4 - air handling unit; 5 - first water distributor; 6 - first water collector; 7 - water supply connecting pipe; 8 - return water connecting pipe; 9 - heat pump controller; 10 - air handling unit controller; 11 - central controller; 12 - water supply stop valve; 13 - buffer water tank; 14 - return water stop valve; 15 - circulation water pump; 16 - check valve; 17 - heat pump circuit control valve; 18 - filter; 19 - box body; 20 - air compressor; 21 - first heat exchanger; 22 - second heat exchanger; 23 - four-way reversing valve; 24 - expansion valve; 25 - water supply branch pipe; 26 - second water distributor; 27 - floor heating coil; 28 - second water collector; 29 - three-way valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes the specific technical solutions of the present utility model so that those skilled in the art can further understand the present utility model without restricting its rights.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

[0025]

Embodiment 1

[0026] Please refer to Figure 1, An energy-saving air source heat pump refrigeration and heating system, including a temperature-changing unit, an output unit, a control unit and connecting pipelines, and the connecting pipelines are arranged between the temperature-changing unit and the output unit.

[0027] The temperature-changing unit includes a heat pump 1, a total water outlet pipe 2 and a total water return pipe 3. There are several heat pumps 1. The total water outlet pipe 2 is connected to the water outlet pipe of each heat pump 1, and the total water return pipe 3 is connected to the water return pipe of each heat pump 1;

[0028] The output unit includes a fan coil 4, a first water distributor 5 and a first water collector 6. There are several fan coils 4. The water distribution ports of the first water distributor 5 are connected to the water inlet pipes of each fan coil 4, and the water collection ports of the first water collector 6 are connected to the water outlet pipes of each fan coil 4;

[0029] The connecting pipelines include a water supply connecting pipe 7 and a water return connecting pipe 8. The two ends of the water supply connecting pipe 7 are respectively connected to the total water outlet pipe 2 and the first water distributor 5, and the two ends of the water return connecting pipe 8 are respectively connected to the total water return pipe 3 and the first water collector 6;

[0030] The control unit includes a heat pump 1 controller, a fan coil controller 10 and a central controller 11. There are multiple heat pump 1 controllers corresponding to each heat pump 1 respectively, and multiple fan coil controllers 10 corresponding to each fan coil 4 respectively. The central controller 11 is communicatively connected to each heat pump 1 controller and each fan coil controller 10 respectively, and the central controller 11 can respectively control the start / stop and refrigeration / heating mode switching of each heat pump 1 according to the number of started fan coils 4.

[0031] Specifically, the communication protocol specifications of the heat pump 1 controller and the fan coil controller 10 are the same. The central controller 11 is communicatively connected to the heat pump 1 controller and the fan coil controller 10 through an RS458 bus and a communication gateway. The communication gateway has a multi-serial port to TCP self-routing function; the central controller 11 is equipped with preset algorithms (1) and (2).

[0032] Preset algorithm (1): It includes five intervals. The first interval: when the number of started air handling units 4 < 20% of the total number of air handling units 4, the number of started heat pumps 1 is set to 20% of the total number (if less than 1 unit, it is counted as 1 unit); the second interval: 20% ≤ the number of started air handling units 4 < 40% of the total number of air handling units 4, the number of started heat pumps 1 is set to 40% of the total number (if less than 1 unit, it is counted as 1 unit); the third interval: 40% ≤ the number of started air handling units 4 < 60% of the total number of air handling units 4, the number of started heat pumps 1 is set to 60% of the total number (if less than 1 unit, it is counted as 1 unit); the fourth interval: 60% ≤ the number of started air handling units 4 < 80% of the total number of air handling units 4, the number of started heat pumps 1 is set to 80% of the total number (if less than 1 unit, it is counted as 1 unit); the fifth interval: when the number of started air handling units 4 ≥ 80% of the total number of air handling units 4, the number of started heat pumps 1 is set to full open. In this way, the central controller 11 can calculate the number of started heat pumps 1 that matches the system demand according to the preset algorithm based on the usage quantity of the air handling units 4.

[0033] Preset algorithm (2): When more than 50% (including 50%) of the control panels of the air handling unit controllers 10 in the room are adjusted to the cooling mode, the central controller 11 reads the cooling mode signal and sends a cooling mode instruction to the air source heat pump 1, so that all the main units of the air source heat pump 1 operate in the cooling mode; when more than 50% (including 50%) of the control panels of the air handling unit controllers 10 in the room are adjusted to the heating mode, the central controller 11 reads the heating mode signal and sends a heating mode instruction to the air source heat pump 1, so that all the main units of the air source heat pump 1 operate in the heating mode. In this way, the central controller 11 can automatically change the operating mode of the air source heat pump 1 according to the mode ratio of the started air handling units 4.

[0034] For the first change of the cooling and heating mode, more than 50% (including 50%) of the number of air handling units 4 in the room need to be adjusted to the same mode simultaneously to change the mode of the main units of the air source heat pump 1. This control can also prevent the situation of frequent mode switching caused by a few units accidentally touching the mode.

[0035] For example, in this embodiment, there are seven air handling units 4 in the room and three heat pumps 1 outdoors. When three of the air handling units 4 are simultaneously adjusted to cooling, one air handling unit 4 maintains heating, and the remaining three air handling units 4 are not started, the total number of started air handling units 4 is about 57% at this time, that is, in the third interval of the preset algorithm (1). Therefore, two heat pumps 1 are started at this time. At the same time, since three of the four started air handling units 4 are simultaneously adjusted to cooling, exceeding half (50%), the central controller 11 controls the two started heat pumps 1 to switch to the cooling mode.

[0036] Further, a water supply stop valve 12 is provided at one end of the water supply connecting pipe 7 close to the water outlet main pipe 2, and a buffer water tank 13 is provided on the water supply connecting pipe 7; a water return stop valve 14 is provided at one end of the water return connecting pipe 8 close to the water return main pipe 3, and a circulating water pump 15 is provided on the water return connecting pipe 8. A Y-shaped filter 18 is also provided between the circulating water pump 15 and the first water collector 6. The water supply stop valve 12 and the water return stop valve 14 can quickly cut off the water supply connecting pipe 7 and the water return connecting pipe 8; the buffer water tank 13 is used to balance the water pressure in the water supply system and ensure the stability of the water flow.

[0037] Further, check valves 16 for preventing water flow back are installed on the water outlet pipe and the water return pipe of each heat pump 1; the check valves 16 are used to prevent water flow back and ensure the stable operation of the system. Heat pump circuit control valves 17 for controlling their opening and closing are also provided on the water outlet pipe and the water return pipe of each heat pump 1. When the heat pump is turned off, the corresponding heat pump circuit control valve 17 is also closed.

[0038] Further, there are three heat pumps 1 and seven air handling units 4. The water outlet main pipe 2 is connected to the water outlet pipe of each heat pump 1 through a first four-way valve, and the water return main pipe 3 is connected to the water return pipe of each heat pump 1 through a second four-way valve.

[0039] Further, the heat pump 1 includes a box body 19. An air compressor 20, a first heat exchanger 21, and a second heat exchanger 22 are provided inside the box body 19. The air compressor 20, the first heat exchanger 21, and the second heat exchanger 22 are connected by pipelines and form a loop. A four-way reversing valve 23 is provided between the air compressor 20 and the first heat exchanger 21, and an expansion valve 24 is provided between the first heat exchanger 21 and the second heat exchanger 22; by switching the working state of the four-way reversing valve 23, the flow direction of the coolant can be changed, and the working mode of the heat pump 1 can be switched (refer to Figure 1 , heat pumps a and c are in the refrigeration mode, and heat pump b is in the heating mode).

[0040]

Embodiment 2

[0041] This embodiment makes further improvements on the basis of Embodiment 1. By adding designs such as the floor heating coil 27, the flexible switching and combined use of floor heating and the air handling unit 4 for heating are realized. Specifically, a water supply branch pipe 25 is connected to the water supply connecting pipe 7. The other end of the water supply branch pipe 25 is provided with a second water distributor 26. The water distribution ports of the second water distributor 26 are connected to the floor heating coil 27. The other end of the floor heating coil 27 is connected to a second water collector 28. A three-way valve 29 is provided on the water return connecting pipe 8. The second water collector 28 and the three-way valve 29 are connected by a water return branch pipe to supply water. When it is necessary to enhance the heating effect, the user can open the water supply branch pipe 25 to guide the water flow to flow through the floor heating coil 27 additionally, realizing the dual functions of floor heating and the air handling unit 4 for heating, ensuring that the heat covers comprehensively from the ground to the air, and significantly improving the heating efficiency and comfort.

[0042] Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

Claims

1. An energy-saving air source heat pump refrigeration and heating system, comprising a temperature-changing unit, an output unit, a control unit and connecting pipelines. The connecting pipelines are arranged between the temperature-changing unit and the output unit, and are characterized in that: The temperature-changing unit includes a heat pump, a total water outlet pipe and a total water return pipe. There are several heat pumps. The total water outlet pipe is connected to the water outlet pipe of each heat pump, and the total water return pipe is connected to the water return pipe of each heat pump; The output unit includes air handling units, a first water distributor and a first water collector. There are several air handling units. The water distribution ports of the first water distributor are connected to the water inlet pipes of each air handling unit, and the water collection ports of the first water collector are connected to the water outlet pipes of each air handling unit; The connecting pipelines include a water supply connecting pipe and a water return connecting pipe. The two ends of the water supply connecting pipe are respectively connected to the total water outlet pipe and the first water distributor, and the two ends of the water return connecting pipe are respectively connected to the total water return pipe and the first water collector; The control unit includes a heat pump controller, an air handling unit controller and a central controller. The heat pump controller is correspondingly arranged on each heat pump, the air handling unit controller is correspondingly arranged on each air handling unit, the central controller is communicatively connected to the heat pump controller and the air handling unit controller respectively, and the central controller can respectively control the start-stop and refrigeration / heating mode switching of each heat pump according to the number of started air handling units.

2. The energy-saving air source heat pump refrigeration and heating system according to claim 1, characterized in that: A water supply stop valve is provided at one end of the water supply connecting pipe close to the total water outlet pipe, and a buffer water tank is provided on the water supply connecting pipe; a water return stop valve is provided at one end of the water return connecting pipe close to the total water return pipe, and a circulating water pump is provided on the water return connecting pipe.

3. The energy-saving air source heat pump refrigeration and heating system according to claim 1, wherein: One-way valves for preventing water flow back are installed on the water outlet pipe and the water return pipe of each heat pump.

4. The energy-saving air source heat pump refrigeration and heating system according to claim 1, wherein: There are three heat pumps. The total water outlet pipe is connected to the water outlet pipe of each heat pump, and the total water return pipe is connected to the water return pipe of each heat pump.

5. The energy-saving air source heat pump refrigeration and heating system according to claim 1, characterized in that: The heat pump includes a box body. An air compressor, a first heat exchanger and a second heat exchanger are arranged in the box body. The air compressor, the first heat exchanger and the second heat exchanger are connected by pipelines and form a loop. A mode switching valve is arranged between the air compressor and the first heat exchanger, and an expansion valve is arranged between the first heat exchanger and the second heat exchanger.

6. The energy-saving air source heat pump refrigeration and heating system according to claim 1, characterized in that: A water supply branch pipe is connected to the water supply connecting pipe. The other end of the water supply branch pipe is provided with a second water distributor. The water distribution port of the second water distributor is connected to a floor heating coil. The other end of the floor heating coil is connected to a second water collector. A three-way valve is arranged on the water return connecting pipe. The second water collector and the three-way valve are connected by a water return branch pipe for water supply.

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