CN-122015339-A - Heat pump unit with heat recovery system and control method

CN122015339ACN 122015339 ACN122015339 ACN 122015339ACN-122015339-A

Abstract

The invention relates to the technical field of heat pumps, in particular to a heat pump unit with a heat recovery system and a control method thereof, wherein the heat pump unit comprises a compressor, a four-way valve, a main heat exchanger, an evaporator and a gas-liquid separator, and further comprises an auxiliary heat exchanger and a defrosting coil, wherein a refrigerant inlet and a refrigerant outlet of the auxiliary heat exchanger are connected to a pipeline connected between the outlet of the compressor and the four-way valve through pipelines, and electromagnetic valves are arranged at the refrigerant inlet and the refrigerant outlet of the auxiliary heat exchanger; the defrosting coil is arranged on one side of the evaporator, two ends of the defrosting coil are respectively connected with the water inlet and the water outlet of the auxiliary heat exchanger through hoses, and the defrosting coil comprises a plurality of heat conduction sections distributed along the length direction of the evaporator and a transition section used for connecting the heat conduction sections end to end. The auxiliary heat exchanger is arranged at the outlet of the compressor in parallel, and the auxiliary heat exchanger has the function of heating by using the redundant heat of the high-temperature refrigerant, so that the aim of heat recovery is fulfilled, and the energy utilization rate of the heat pump unit is improved.

Inventors

JING HUI
WU YINGWU
ZHONG HUIAN

Assignees

广东纽恩泰新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (10)

1. The utility model provides a heat pump set with heat recovery system, includes compressor, cross valve, main heat exchanger, evaporimeter and vapour and liquid separator, its characterized in that still includes: The refrigerant inlet and the refrigerant outlet of the auxiliary heat exchanger are connected to a pipeline connected between the outlet of the compressor and the four-way valve through pipelines, and electromagnetic valves are arranged at the refrigerant inlet and the refrigerant outlet of the auxiliary heat exchanger; The defrosting coil is arranged on one side of the evaporator, two ends of the defrosting coil are respectively connected with the water inlet and the water outlet of the auxiliary heat exchanger through hoses, and the defrosting coil comprises a plurality of heat conduction sections distributed along the length direction of the evaporator and transition sections used for connecting the heat conduction sections end to end; The driving mechanism is arranged on the evaporator and used for driving the defrosting coil to translate along the height direction and the width direction of the evaporator; The evaporator comprises a plurality of fins which are uniformly arranged at intervals along the length direction of the evaporator, a plurality of rows of through holes which are used for a heat conduction copper pipe to pass through are formed in the fins at intervals along the height direction of the fins, a plurality of heat conduction gaps are further formed in one side of the fins, which faces the defrosting coil, of each fin, the plurality of heat conduction gaps are respectively in one-to-one correspondence with the plurality of heat conduction sections in the defrosting coil, the heat conduction gaps are located between two adjacent rows of through holes, and the driving mechanism can drive the heat conduction sections of the defrosting coil to enter or leave the heat conduction gaps.
2. The heat pump unit with the heat recovery system of claim 1, wherein the driving mechanism comprises two extending tables arranged on the left side and the right side of the evaporator, sliding rails are arranged on the surfaces of the extending tables, displacement blocks are arranged on the sliding rails in a sliding mode, the inner sides of the displacement blocks are provided with sliding blocks in a sliding mode along the width direction of the evaporator, and the left side and the right side of the defrosting coil are fixedly connected with the two sliding blocks respectively.
3. A heat pump unit having a heat recovery system according to claim 2, wherein the number of displacement blocks on the extension deck matches the number of thermally conductive sections of the defrost coil.
4. The heat pump unit with the heat recovery system of claim 1, wherein the defrosting coil is made of red copper, and a heat insulation sleeve is wrapped outside a transition section of the defrosting coil.
5. The heat pump unit with the heat recovery system according to claim 2, wherein a driving electric cylinder is arranged on the outer side of the extension bedplate, the movable end of the driving electric cylinder is fixedly connected with a displacement block through a connecting piece, an electromagnet is arranged at the inner end of the displacement block, a permanent magnet block is fixedly embedded at one end of the sliding block, which is opposite to the electromagnet, and when the electromagnet is electrified, the magnetic poles of the opposite ends of the electromagnet and the permanent magnet block are the same.
6. The heat pump unit with heat recovery system according to claim 1, wherein the width of the heat conducting notch is matched with the diameter of the defrosting coil, the inner end of the heat conducting notch is in an arc shape matched with the outline of the defrosting coil, and the inner end of the heat conducting notch is positioned at one half of the width of the fin.
7. The heat pump unit with the heat recovery system of claim 1, wherein the inner sides of the heat conducting gaps are respectively provided with heat conducting fins in a sliding manner along the height direction, the heat conducting fins and the fins are in a sliding fit manner along the height direction, and the outer sides of the opposite ends of the two heat conducting fins in the same heat conducting gap are in an inward concave arc shape; the outer side of the fin is provided with a plurality of thin rods distributed along the horizontal direction, the number of the thin rods corresponds to the number of the heat conducting fins on the same fin, and the heat conducting fins at the same height are fixedly connected with the same thin rod.
8. The heat pump unit with the heat recovery system of claim 7, wherein the heat conducting fin is a double-layer red copper sheet, two sides of the heat conducting fin are respectively attached to two sides of the fin, protruding edges distributed along the height direction are arranged on the surface of the fin and positioned on two sides of the heat conducting notch, grooves matched with the protruding edges are formed in the heat conducting fin, and the protruding edges are embedded in the grooves.
9. The heat pump unit with the heat recovery system according to claim 7, wherein retaining pieces are fixedly arranged on two sides of the evaporator, a plurality of waist-shaped grooves which are in one-to-one correspondence with the thin rods are formed in the retaining pieces along the height direction, the end parts of the thin rods penetrate through the waist-shaped grooves, elastic ropes are connected between the two thin rods which are connected with the two heat conducting pieces in the same heat conducting notch, and the elastic ropes are in a tightening state in a natural state.
10. A control method of a heat pump unit with a heat recovery system, applicable to a heat pump unit according to any one of claims 1 to 9, characterized by comprising the steps of: When redundant heat is generated in the unit system, solenoid valves at the inlet and the outlet of the auxiliary heat exchanger are opened, so that high-temperature refrigerant enters the auxiliary heat exchanger, and the water body in the auxiliary heat exchanger is heated; when the surface of the evaporator is frosted, enabling hot water to enter the defrosting coil; Then the driving mechanism is used for controlling the movement of the defrosting coil, so that the heat conduction section of the defrosting coil is contacted with the fins of the evaporator; after the defrosting operation is finished, the driving mechanism is used for controlling the separation of the defrosting coil pipe and the fins.

Description

Heat pump unit with heat recovery system and control method Technical Field The invention relates to the technical field of heat pumps, in particular to a heat pump unit with a heat recovery system and a control method. Background In the actual operation process of the existing heat pump unit, a plurality of technical pain points of unreasonable energy utilization and high energy consumption exist, the full play of the energy-saving efficiency is limited, and the development requirements of the current energy conservation, emission reduction and carbon neutralization are not met. Specifically, under the heating working condition, when the heat demand of the heat source side of a user is lower, the heating quantity of the existing heat pump unit can be reduced only through a compressor frequency-reducing mode, and the adjusting mode not only can influence the running stability of the unit, but also can cause the problem of insufficient energy utilization. When the cooling mode is switched to in summer, a large amount of waste heat is generated on the condensing side of the unit, the part of waste heat is not effectively recycled in the prior art, the waste heat is directly discharged into the air, serious energy waste is caused by daily heat loss, and the whole energy utilization efficiency of the unit is reduced. In addition, under the low-temperature heating working condition in winter, when the external environment humidity is higher, the surface of the fins of the evaporator of the heat pump unit is extremely easy to frost, and the frost layer can obstruct the heat exchange process and reduce the heating efficiency. In order to ensure the normal operation of the heat pump unit, the compressor needs to separate out a part of heat for defrosting operation at intervals, and the process not only interrupts the normal heating supply, but also additionally consumes a large amount of energy of the heat pump unit, thereby further increasing the operation energy consumption of the heat pump unit. Therefore, the existing household heating and commercial heat pump units have the defects of heat recovery deficiency and high energy consumption of frosting and defrosting, and therefore, the heat pump unit with a heat recovery system and a control method are provided to well solve the defects. Disclosure of Invention The invention aims to provide a heat pump unit with a heat recovery system and a control method thereof, which are used for solving the problems in the background technology. The invention is realized by the following technical scheme that the heat pump unit with the heat recovery system comprises a compressor, a four-way valve, a main heat exchanger, an evaporator and a gas-liquid separator, and further comprises: The refrigerant inlet and the refrigerant outlet of the auxiliary heat exchanger are connected to a pipeline connected between the outlet of the compressor and the four-way valve through pipelines, and electromagnetic valves are arranged at the refrigerant inlet and the refrigerant outlet of the auxiliary heat exchanger; The defrosting coil is arranged on one side of the evaporator, two ends of the defrosting coil are respectively connected with the water inlet and the water outlet of the auxiliary heat exchanger through hoses, and the defrosting coil comprises a plurality of heat conduction sections distributed along the length direction of the evaporator and transition sections used for connecting the heat conduction sections end to end; The driving mechanism is arranged on the evaporator and used for driving the defrosting coil to translate along the height direction and the width direction of the evaporator; The evaporator comprises a plurality of fins which are uniformly arranged at intervals along the length direction of the evaporator, a plurality of rows of through holes which are used for a heat conduction copper pipe to pass through are formed in the fins at intervals along the height direction of the fins, a plurality of heat conduction gaps are further formed in one side of the fins, which faces the defrosting coil, of each fin, the plurality of heat conduction gaps are respectively in one-to-one correspondence with the plurality of heat conduction sections in the defrosting coil, the heat conduction gaps are located between two adjacent rows of through holes, and the driving mechanism can drive the heat conduction sections of the defrosting coil to enter or leave the heat conduction gaps. Optionally, the driving mechanism comprises two extending bedplate arranged at the left side and the right side of the evaporator, a sliding rail is arranged on the surface of the extending bedplate, a displacement block is arranged on the sliding rail in a sliding manner, the inner side of the displacement block is provided with a sliding block in a sliding manner along the width direction of the evaporator, and the left side and the right side of the defrosting coil are fixedly connected with the