CN213272797U

CN213272797U - Low-temperature heating unit with energy recovery function

Info

Publication number: CN213272797U
Application number: CN202022144163.0U
Authority: CN
Inventors: 朱伯永; 凌拥军; 汪卫平; 周锦杨
Original assignee: Zhejiang Zhongguang Electric Appliances Co Ltd
Current assignee: Zhejiang Zhongguang Electric Appliance Group Co Ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-05-25
Anticipated expiration: 2030-09-25

Abstract

The utility model relates to a heating equipment technical field, concretely relates to low temperature heating unit with energy recuperation function. The system comprises a first heat exchanger, a throttling device, a second heat exchanger and a compressor which are sequentially communicated to form a refrigerant main loop, and further comprises a third heat exchanger, wherein the third heat exchanger is provided with a refrigerant flow path and a water flow path, and the refrigerant flow path is connected to a pipeline which is positioned between the first heat exchanger and the throttling device and/or between the throttling device and the second heat exchanger in the refrigerant main loop; the water circulation system is characterized in that two ends of the water flow path are respectively connected with the energy storage water tank to form a water circulation loop, and a water pump is arranged on the water circulation loop. The utility model discloses a low temperature heating unit carries out energy recuperation through cooling technology once more to supplementary when providing life hot water and defrosting.

Description

Low-temperature heating unit with energy recovery function

Technical Field

The utility model relates to a heating equipment technical field, concretely relates to low temperature heating unit with energy recuperation function.

Background

The state implements a policy of changing coal into electricity, the low-temperature air source heat pump heating unit is widely used in the north, and the low-temperature heat pump is energy-saving and environment-friendly and has been widely accepted to replace a coal boiler for heating. Because the ambient temperature is lower, heat pump set needs the hot water of heating higher temperature in order to satisfy northern resident's heating demand, consequently, heat pump set operation in-process, energy loss is higher, and the energy efficiency is lower, can be less than 1 even under the extreme condition.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a low temperature heating unit with energy recovery function, which can recover energy through recooling technology and provide hot water and defrosting assistance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a low-temperature heating unit with an energy recovery function comprises a first heat exchanger, a throttling device, a second heat exchanger and a compressor which are sequentially communicated to form a main refrigerant loop, and further comprises a third heat exchanger, wherein the third heat exchanger is provided with a refrigerant flow path and a water flow path, and the refrigerant flow path is connected to a pipeline which is positioned between the first heat exchanger and the throttling device and/or between the throttling device and the second heat exchanger in the main refrigerant loop; the water circulation system is characterized in that two ends of the water flow path are respectively connected with the energy storage water tank to form a water circulation loop, and a water pump is arranged on the water circulation loop.

And the four-way valve is used for switching the heating and defrosting of the refrigerant main loop and is respectively connected with the first heat exchanger, the second heat exchanger, the exhaust port of the compressor and the air return port through pipelines.

Further, when the refrigerant main loop enters a heating mode, the first heat exchanger and the third heat exchanger are condensers, the second heat exchanger is an evaporator, and the refrigerant main loop has the following connection relationship: the valve port C of the four-way valve, the first heat exchanger, the third heat exchanger, the throttling device and the refrigerant inlet of the second heat exchanger are sequentially connected through pipelines; the valve port E of the four-way valve is connected with a refrigerant outlet of the second heat exchanger through a pipeline; the valve port of the four-way valve D is connected with the exhaust port of the compressor through a pipeline; the valve port of the four-way valve S is connected with a return air port of the compressor through a pipeline.

Further, when the refrigerant main loop enters a defrosting mode, the first heat exchanger and the third heat exchanger are evaporators, the second heat exchanger is a condenser, and the refrigerant main loop has the following connection relationship: a valve port C of the four-way valve is connected with a refrigerant outlet of the first heat exchanger through a pipeline; the four-way valve E valve port, the second heat exchanger, the throttling device, the third heat exchanger and the first heat exchanger refrigerant inlet are sequentially connected through pipelines; the valve port of the four-way valve D is connected with the exhaust port of the compressor through a pipeline; the valve port of the four-way valve S is connected with a return air port of the compressor through a pipeline.

Further, the four-way valve is an electromagnetic valve.

The utility model adopts the above technical scheme, following beneficial effect has at least: the refrigerant passing through the third heat exchanger is secondarily cooled, the supercooling degree of the refrigerant is increased, and the unit energy efficiency is improved; meanwhile, the water temperature of the energy storage water tank is increased, the energy storage water tank can be used for providing domestic hot water, and all or part of heat required by defrosting can be provided through the third heat exchanger (serving as an evaporator during defrosting) when the unit defrosts, so that fluctuation of indoor water temperature is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural view of a low-temperature heating unit according to an embodiment of the present invention when used for heating;

fig. 2 is a schematic structural view of the low-temperature heating unit according to the embodiment of the present invention when used for defrosting.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, the following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings.

It should be noted that the terms "first" and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1, do the embodiment of the present invention provides a schematic structural diagram of a low temperature heating unit for heating, including a coolant main loop and a water circulation loop, the coolant main loop includes a first heat exchanger 1, a throttling device 2, a second heat exchanger 3, a compressor 4 and a four-way valve 5 which are sequentially connected, the water circulation loop includes a third heat exchanger 6, an energy storage water tank 7 and a water pump 8 which are sequentially connected, specifically, the water flow path of the third heat exchanger 6 is connected to the water circulation loop, and the coolant flow path of the third heat exchanger 6 is connected to the coolant main loop. Preferably, the third heat exchanger 6 is connected to a pipeline between the first heat exchanger 1 and the throttling device 2 and/or between the throttling device 2 and the second heat exchanger 3.

Specifically, the four-way valve 5 is an electromagnetic valve and has a valve port C, D, E, S, a valve port D, E of the four-way valve 5 is respectively connected with an air inlet and a return air port of the compressor 4, a valve port C of the four-way valve 5 is connected with the first heat exchanger 1, and a valve port E of the four-way valve 5 is connected with the second heat exchanger 3. The four-way valve 5 controls the opening and closing of each valve port to realize the switching between the heating mode and the defrosting mode of the heat pump unit under the condition that the positions of the first heat exchanger 1 and the second heat exchanger 3 are not changed.

When the heat pump unit is in a heating mode, the first heat exchanger 1 and the third heat exchanger 6 serve as condensers, the second heat exchanger 3 serves as an evaporator, a high-temperature and high-pressure refrigerant passing through the compressor 4 flows in from a valve port D of the four-way valve 5, flows out from a valve port C, firstly radiates heat through the first heat exchanger 1 to provide energy required by heating, a medium-temperature and low-pressure refrigerant after energy release enters the third heat exchanger 6 for secondary cooling and performs circulating heat exchange with low-temperature water flowing through the third heat exchanger 6, and the warm water after heat exchange is stored in the water tank 7 and can be used for providing domestic hot water; meanwhile, the low-temperature high-pressure refrigerant subjected to secondary refrigeration enters the throttling device 2, the low-temperature low-pressure refrigerant formed after throttling enters the second heat exchanger 3 to absorb low-grade heat energy in air and then flows in through a valve port E of the four-way valve, and the low-temperature low-pressure refrigerant flows out through a valve port S and then flows back to the compressor 4 through a return air port of the compressor.

Referring to fig. 2, a schematic structural diagram of a low temperature heating unit for defrosting according to an embodiment of the present invention is shown, when the heat pump unit is in a defrosting mode, the first heat exchanger 1 and the third heat exchanger 6 are used as evaporators, the second heat exchanger 3 is used as a condenser, high-temperature and high-pressure refrigerant after passing through the compressor 4 flows in from a valve port D of the four-way valve 5, flows out from a valve port E, firstly, the refrigerant is radiated by the second heat exchanger 3 to defrost the unit, low-temperature and high-pressure refrigerant after releasing energy enters the throttling device 2, the throttled low-temperature and low-pressure refrigerant enters the third heat exchanger 6 to perform circulating heat exchange with warm water flowing through the energy storage water tank 7, and the energy is absorbed to provide part or all energy required by defrosting, the medium-temperature low-pressure refrigerant enters the first heat exchanger 1 for optional heat exchange and then flows in through a valve port C of the four-way valve, and flows out through a valve port S and then flows back to the compressor 4 through a return air port of the compressor.

The utility model adopts the secondary cooling technology to recover energy based on the current situation that the northern environmental temperature is low and the air energy heat pump type heating unit is gradually popularized, so as to overcome the defect that the energy efficiency of the low-temperature heating unit is low, and meanwhile, the energy of the recovery machine is stored in the energy storage water tank, so that the energy recovery machine is used for providing domestic hot water on one hand; on the other hand, the energy-saving heating and defrosting device is used for providing all or part of energy required by unit defrosting, integrates heating, defrosting and water supply, and is comprehensive in function and efficient in energy utilization.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A low-temperature heating unit with an energy recovery function comprises a first heat exchanger (1), a throttling device (2), a second heat exchanger (3) and a compressor (4) which are sequentially communicated to form a refrigerant main loop, and is characterized by also comprising a third heat exchanger (6),

the third heat exchanger (6) is provided with a refrigerant flow path and a water flow path, and the refrigerant flow path is connected to a pipeline positioned between the first heat exchanger (1) and the throttling device (2) and/or between the throttling device (2) and the second heat exchanger (3) in the refrigerant main loop; and two ends of the water flow path are respectively connected with an energy storage water tank (7) to form a water circulation loop, and a water pump (8) is arranged on the water circulation loop.

2. The low-temperature heating unit with the energy recovery function according to claim 1, further comprising a four-way valve (5) for switching between heating and defrosting of the main refrigerant loop, wherein the four-way valve (5) is respectively connected with the first heat exchanger (1), the second heat exchanger (3), the compressor exhaust port and the return air port through pipelines.

3. The low-temperature heating unit with the energy recovery function according to claim 2, wherein when the main refrigerant circuit enters the heating mode, the first heat exchanger (1) and the third heat exchanger (6) are condensers, the second heat exchanger (3) is an evaporator, and the main refrigerant circuit is connected in a relationship that: the valve port C of the four-way valve, the first heat exchanger (1), the third heat exchanger (6), the throttling device (2) and the refrigerant inlet of the second heat exchanger are sequentially connected through a pipeline; the valve port E of the four-way valve is connected with a refrigerant outlet of the second heat exchanger (3) through a pipeline; the valve port of the four-way valve D is connected with the exhaust port of the compressor through a pipeline; the valve port of the four-way valve S is connected with a return air port of the compressor through a pipeline.

4. The low-temperature heating unit with the energy recovery function according to claim 2, wherein when the primary refrigerant circuit enters the defrosting mode, the first heat exchanger (1) and the third heat exchanger (6) are evaporators, the second heat exchanger (3) is a condenser, and the primary refrigerant circuit is connected in a relationship that: the valve port C of the four-way valve is connected with a refrigerant outlet of the first heat exchanger (1) through a pipeline; the four-way valve E valve port, the second heat exchanger (3), the throttling device (2), the third heat exchanger (6) and the first heat exchanger refrigerant inlet are sequentially connected through a pipeline; the valve port of the four-way valve D is connected with the exhaust port of the compressor through a pipeline; the valve port of the four-way valve S is connected with a return air port of the compressor through a pipeline.

5. The low-temperature heating unit with the energy recovery function according to any one of claims 2 to 4, wherein the four-way valve (5) is an electromagnetic valve.