Air energy ultralow-temperature heat pump

Abstract

The utility model discloses an air energy ultralow-temperature heat pump, which belongs to the technical field of air energy heat pumps and comprises a water tank (a condenser is arranged in the water tank), an external unit (comprising an evaporator, a compressor and an electronic expansion valve) and an intelligent defrosting system. During working, the outdoor unit evaporator absorbs heat of external low-temperature air through the air blower, so that a refrigerant is evaporated and is compressed into high-temperature and high-pressure gas through the compressor, and then the high-temperature and high-pressure gas releases heat to water in the water tank condenser. And the condensed refrigerant liquid returns to the evaporator for circulation through throttling and pressure reduction. During operation, the infrared frosting detection sensor on the surface of the evaporator monitors frosting, and data are transmitted to the controller. When frosting reaches the set thickness, the controller starts the hot gas bypass electromagnetic valve, part of high-temperature refrigerant gas directly enters the evaporator to be defrosted, and meanwhile the electric heating fan is started for assisting. The heat pump can stably and efficiently heat in an ultralow-temperature environment, the defrosting period is prolonged, and reliable operation is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air energy heat pump technical field especially relates to an air energy ultralow temperature heat pump. BACKGROUND

[0002] Air energy heat pump unit is a kind of equipment using air energy as heat source and temperature is increased for water heating after being compressed by compressor, it usually includes main machine and water tank, the circulation pipeline is communicated between the two, water flow is circulated using water pump, water flow is heated after heat exchanger and absorbs heat to form hot water.

[0003] But when the working environment temperature is lower, condenser is very easy to frost, reduce thermal efficiency, increase energy consumption.The structure of the existing ultralow temperature air energy heat pump unit is complex, the defrosting effect of frost on condenser is not good, cannot frost well, quickly, thereby affecting efficiency, waste resources, not conducive to long-term development.

[0004] Therefore, an air energy ultralow temperature heat pump is provided. Utility model content

[0005] To solve the above technical problems, the utility model provides an air energy ultralow temperature heat pump.

[0006] To achieve the above object, the utility model provides an air energy ultralow temperature heat pump, comprising:

[0007] Water tank, the condenser is arranged in the water tank;

[0008] Outdoor unit, the evaporator is arranged in the outdoor unit, the evaporator is communicated with the condenser by refrigerant pipeline, the air blower is arranged on the outdoor unit and corresponds to the evaporator;

[0009] Compressor, set up in the outdoor unit, the suction port of the compressor is connected with the outlet of the evaporator by the refrigerant pipeline, the exhaust port of the compressor is connected with the air inlet of the condenser by the refrigerant pipeline;

[0010] Electronic expansion valve, is installed on the refrigerant pipeline between the outlet of the condenser and the air inlet of the evaporator;

[0011] Intelligent defrosting system, including hot gas bypass solenoid valve, electric heater fan, infrared frost detection sensor and controller;The infrared frost detection sensor is installed on the evaporator surface by mounting bracket, the infrared frost detection sensor is electrically connected with the controller, and the controller controls the hot gas bypass solenoid valve and the electric heater fan to defrost the evaporator.

[0012] Preferably, one end of the hot gas bypass electromagnetic valve is connected to the refrigerant pipeline between the compressor exhaust port and the condenser, and the other end is connected to the refrigerant pipeline between the evaporator inlet and the electronic expansion valve.

[0013] Preferably, the air outlet of the electric heating fan is directed towards the evaporator, the electric heating fan is electrically connected with the controller, and the controller is fixed to the outdoor unit.

[0014] Preferably, a liquid collecting basin is fixed to the bottom of the outdoor unit, the liquid collecting basin is correspondingly arranged at the bottom of the evaporator, a liquid outlet pipe is arranged at the bottom of the liquid collecting basin, and the liquid outlet pipe is communicated with the outside.

[0015] Preferably, a capillary tube is connected in parallel with the electronic expansion valve.

[0016] Preferably, a plurality of fins are fixed to the outside of the pipeline in the evaporator.

[0017] Preferably, an economizer is arranged in the outdoor unit, a gas supplement port of the economizer is connected with the condenser pipeline at the outlet of the condenser through an intermediate pressure pipeline, a pressure reducing valve is arranged on the intermediate pressure pipeline, and a gas outlet port of the economizer is communicated with the compression chamber of the compressor.

[0018] Preferably, the fins are arranged at equal intervals.

[0019] Compared with the prior art, the air energy ultra-low temperature heat pump has the following advantages and technical effects:

[0020] When the air energy ultra-low temperature heat pump is working, the evaporator in the outdoor unit absorbs the heat of the low-temperature air outside under the action of the air blower, so that the refrigerant is evaporated, the low-temperature and low-pressure refrigerant gas is sucked into the compressor through the refrigerant pipeline, is compressed into high-temperature and high-pressure gas, and is then sent to the condenser in the water tank through the refrigerant pipeline to release heat to the water in the water tank to realize heating. The refrigerant liquid condensed by the condenser is returned to the evaporator through the electronic expansion valve and the capillary tube compound throttling structure after pressure reduction. During operation, the infrared frost detection sensor arranged on the surface of the evaporator monitors the frost condition in real time, and transmits the data to the controller. When the frost thickness reaches the set value, the controller starts the hot gas bypass electromagnetic valve to make part of the high-temperature and high-pressure refrigerant gas directly enter the evaporator without passing through the condenser to melt the frost, and simultaneously starts the electric heating fan to assist in quickly and completely removing the frost layer, so as to restore the heat exchange efficiency of the evaporator, realize stable and efficient heating in the ultra-low temperature environment, prolong the defrosting period, improve the heating continuity and stability of the system, and ensure the reliable operation of the heat pump. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings, and their description, are presented to explain the application and not to limit or define it. In the drawings:

[0022] Fig. 1 It is air energy ultra-low temperature heat pump structure schematic view of the utility model.

[0023] Fig. 2 It is intelligent defrosting system part structure schematic view of the utility model.

[0024] In the figure: 1, water tank;2, condenser;3, outdoor unit;4, evaporator;5, refrigerant pipeline;6, air blower;7, compressor;8, electronic expansion valve;9, hot gas bypass solenoid valve;10, electric heating fan;11, infrared frost detection sensor;12, controller;13, liquid receiving hopper;14, liquid outlet pipe;15, capillary tube;16, fin;17, economizer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, clear and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0027] Refer to Figs. 1-2 The embodiment provides an air energy ultra-low temperature heat pump, which comprises:

[0028] A water tank 1 is internally provided with a condenser 2.

[0029] An outdoor unit 3 is internally provided with an evaporator 4, the evaporator 4 is communicated with the condenser 2 through a refrigerant pipeline 5, and the outdoor unit 3 is provided with an air blower 6 corresponding to the evaporator 4.

[0030] A compressor 7 is arranged in the outdoor unit 3, the suction port of the compressor 7 is connected with the outlet of the evaporator 4 through the refrigerant pipeline 5, and the exhaust port of the compressor 7 is connected with the air inlet of the condenser 2 through the refrigerant pipeline 5.

[0031] An electronic expansion valve 8 is installed on the refrigerant pipeline 5 between the outlet of the condenser 2 and the air inlet of the evaporator 4.

[0032] The intelligent defrosting system comprises a hot gas bypass electromagnetic valve 9, an electric heating fan 10, an infrared frost detection sensor 11 and a controller 12; the infrared frost detection sensor 11 is installed on the surface of the evaporator 4 through a mounting bracket, the infrared frost detection sensor 11 is electrically connected with the controller 12, and the controller 12 controls the hot gas bypass electromagnetic valve 9 and the electric heating fan 10 to defrost the evaporator 4.

[0033] When the air energy ultra-low temperature heat pump works, the evaporator 4 in the outdoor unit 3 absorbs the heat of the low-temperature air outside under the action of the air blower 6, so that the refrigerant evaporates; the low-temperature and low-pressure refrigerant gas is sucked into the compressor 7 through the refrigerant pipeline 5, compressed into high-temperature and high-pressure gas, and then sent to the condenser 2 in the water tank 1 through the refrigerant pipeline 5 to release heat to the water in the water tank 1 to realize heating; the refrigerant liquid condensed through the condenser 2 returns to the evaporator 4 after being decompressed by the electronic expansion valve 8 and the capillary tube 15 composite throttling structure to circulate. During operation, the infrared frost detection sensor 11 installed on the surface of the evaporator 4 monitors the frost in real time and transmits the data to the controller 12; when the frost thickness reaches the set value, the controller 12 starts the hot gas bypass electromagnetic valve 9 to let part of the high-temperature and high-pressure refrigerant gas not pass through the condenser 2 and directly enter the evaporator 4 to melt frost, and at the same time, the electric heating fan 10 is started to assist, so that the frost layer is quickly and completely removed, the heat exchange efficiency of the evaporator 4 is restored, and the whole realizes stable and efficient heating in an ultra-low temperature environment, prolongs the defrosting period, improves the heating continuity and stability of the system, and guarantees the reliable operation of the heat pump.

[0034] Further optimization scheme, one end of the hot gas bypass electromagnetic valve 9 is connected to the refrigerant pipeline between the exhaust port of the compressor 7 and the condenser 2, and the other end is connected to the refrigerant pipeline between the inlet of the evaporator 4 and the electronic expansion valve 8.

[0035] When the hot gas bypass electromagnetic valve 9 is opened, part of the high-temperature and high-pressure refrigerant gas does not pass through the condenser 2 and directly enters the evaporator 4, and the heat of the high-temperature refrigerant is used to defrost the evaporator 4.

[0036] Further optimization scheme, the air outlet of the electric heating fan 10 faces the evaporator 4, the electric heating fan 10 is electrically connected with the controller 12, and the controller 12 is fixedly connected to the outdoor unit 3.

[0037] The electric heating fan 10 is started when the frost thickness is large, which can further speed up the defrosting speed and ensure that the frost layer on the surface of the evaporator 4 can be quickly and completely removed to restore the heat exchange efficiency of the evaporator 4.

[0038] Further, when the frost thickness is greater than or equal to 1.5 mm, the hot gas bypass electromagnetic valve 9 is started, and when the thickness is greater than or equal to 2 mm, the electric heating fan 10 is added, so as to ensure the balance between energy consumption and efficiency.

[0039] Further optimization scheme, the bottom of the outdoor unit 3 is fixedly connected with a liquid receiving hopper 13, the liquid receiving hopper 13 is correspondingly arranged at the bottom of the evaporator 4, a liquid outlet pipe 14 is arranged at the bottom of the liquid receiving hopper 13, and the liquid outlet pipe 14 is communicated with the outside.

[0040] The liquid melted from snow and frost is collected through the liquid receiving hopper 13 and discharged from the liquid outlet pipe 14, so that the liquid is prevented from accumulating in the outdoor unit 3.

[0041] Further optimization scheme, the electronic expansion valve 8 is connected with a capillary tube 15 in parallel.

[0042] The high-temperature and high-pressure refrigerant liquid from the condenser 2 is firstly subjected to preliminary throttling and pressure reduction through the electronic expansion valve 8, and then is mixed with the refrigerant subjected to throttling and pressure reduction through the capillary tube 15, so that the pressure and temperature are further reduced, and the refrigerant enters the evaporator 4 in a suitable state to be evaporated and absorb heat. The electronic expansion valve 8 can accurately adjust the refrigerant flow according to the system operating condition, and the capillary tube 15 plays an auxiliary throttling role in the low-temperature condition, and the two cooperate to ensure the stable operation of the system in the ultra-low-temperature environment. Specifically, when the environmental temperature is greater than or equal to -20 DEG C, the electronic expansion valve 8 independently adjusts the refrigerant flow; when the temperature is less than -20 DEG C, the capillary tube 15 works in parallel with the electronic expansion valve 8, and the flow is dynamically distributed through a PID algorithm, and the capillary tube 15 bears 30%-50% of the throttling load.

[0043] Further optimization scheme, a plurality of fins 16 are fixedly connected outside the pipeline in the evaporator 4.

[0044] The fins 16 effectively increase the heat exchange area and improve the heat exchange efficiency of the evaporator 4 in the low-temperature environment.

[0045] Further optimization scheme, an economizer 17 is arranged in the outdoor unit 3, a gas supplementing port of the economizer 17 is connected with a condensing pipeline at the outlet of the condenser 2 through an intermediate pressure pipeline, a pressure reducing valve is arranged on the intermediate pressure pipeline, and a gas outlet of the economizer 17 is communicated with a compression chamber of the compressor 7.

[0046] The built-in economizer 17 structure sucks part of the refrigerant gas to supplement the gas through the intermediate pressure refrigerant pipeline, increases the gas conveying amount of the compressor 7, improves the refrigerating and heating capacity of the compressor 7 in the low-temperature environment, and enables the compressor 7 to still operate efficiently and stably in the ultra-low-temperature condition.

[0047] Further optimization scheme, the fins 16 are arranged at equal intervals.

[0048] Further, the interval of the fins 16 is preferably 1.5-2.5 mm, and in this range, the interval of the fins 16 can ensure sufficient heat exchange area while avoiding the problems of poor air flow and frosting caused by too small interval.

[0049] The non-exhaustive parts of the utility model are conventional technical means known by those skilled in the art.

[0050] In the description of the utility model, need understanding is, the orientation or position relation that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate is based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model, and is not indicate or imply the device or element that the indicated must have a particular orientation, constructs and operates with a particular orientation, therefore can not be understood as the limitation to the utility model.

[0051] The above-described embodiments are only preferred modes of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical scheme of the utility model made by the ordinary skill in the art without departing from the design spirit of the utility model should fall within the protection scope determined by the utility model claims.

Claims

1. An air-to-air ultra-low temperature heat pump, characterized in that, Include: Water tank (1), the water tank (1) is equipped with condenser (2) in; The outer machine (3) is equipped with evaporator (4) in, the evaporator (4) is communicated with the condenser (2) through the refrigerant pipeline (5), the outer machine (3) is provided with the air blower (6) on the evaporator (4) corresponding; Compressor (7) is arranged in the outer machine (3), the suction port of the compressor (7) is connected with the outlet of the evaporator (4) through the refrigerant pipeline (5), and the exhaust port of the compressor (7) is connected with the inlet of the condenser (2) through the refrigerant pipeline (5); Electronic expansion valve (8) is installed on the refrigerant pipeline (5) between the outlet of the condenser (2) and the inlet of the evaporator (4); Intelligent defrosting system, including hot gas bypass solenoid valve (9), electric heating fan (10), infrared frost detection sensor (11) and controller (12);The infrared frost detection sensor (11) is installed on the surface of the evaporator (4) through the mounting bracket, and the infrared frost detection sensor (11) is electrically connected with the controller (12), and the controller (12) controls the hot gas bypass solenoid valve (9) and the electric heating fan (10) to defrost the evaporator (4).

2. An air-to-energy ultra-low temperature heat pump according to claim 1, characterized in that: One end of the hot gas bypass solenoid valve (9) is connected on the refrigerant pipeline between the exhaust port of the compressor (7) and the condenser (2), and the other end is connected on the refrigerant pipeline between the inlet of the evaporator (4) and the electronic expansion valve (8).

3. An air-to-energy sub-ambient heat pump as claimed in claim 2, characterised in that: The air outlet of the electric heating fan (10) faces the evaporator (4), and the electric heating fan (10) is electrically connected with the controller (12), and the controller (12) is fixedly connected on the outer machine (3).

4. The air-to-energy subcritical heat pump of claim 1, wherein: The bottom of the outer machine (3) is fixedly connected with a liquid receiving hopper (13), and the liquid receiving hopper (13) is correspondingly arranged at the bottom of the evaporator (4). A liquid outlet pipe (14) is arranged at the bottom of the liquid receiving hopper (13), and the liquid outlet pipe (14) is communicated with the outside.

5. The air-to-energy subcritical heat pump of claim 1, wherein: The electronic expansion valve (8) is connected with a capillary tube (15) in parallel.

6. The air-to-energy subcritical heat pump of claim 1, wherein: A plurality of fins (16) are fixedly connected outside the pipeline in the evaporator (4).

7. The air-to-energy subcritical heat pump of claim 1, wherein: The outer machine (3) is provided with an economizer (17), the air inlet of the economizer (17) is connected with the condensing pipeline at the outlet of the condenser (2) through an intermediate pressure pipeline, a pressure reducing valve is arranged on the intermediate pressure pipeline, and the air outlet of the economizer (17) is communicated with the compression chamber of the compressor (7).

8. The air-to-energy subcritical heat pump of claim 6, wherein: The fins (16) are arranged at equal intervals.

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