阅读说明：本技术 一种用于冷库冷风机的蓄热除霜系统和冷库 (Heat accumulation defrosting system for cold storage air cooler and cold storage ) 是由 谭海辉 潘巨华 刘展 于 2019-12-09 设计创作，主要内容包括：本发明涉及一种用于冷库冷风机的蓄热除霜系统,包括制冷装置、蓄热装置、释热装置；制冷装置包括依次设置的压缩机、蓄热换热器、冷凝器、节流装置、蒸发器,蒸发器再接入压缩机,形成制冷循环回路；蓄热装置包括依次设置的蓄热罐、蓄热泵、蓄热换热器、蓄热阀,蓄热阀再接入蓄热罐,形成蓄热循环回路；释热装置包括依次设置的蓄热罐、释热泵、释热换热器、释热阀,释热阀再接入蓄热罐,形成释热循环回路；制冷装置与蓄热装置在蓄热换热器进行热交换,制冷装置与释热装置通过蒸发器和释热换热器进行热交换。还涉及一种冷库。本发明可降低能耗,运行更平稳,减少库内温度波动,属于制冷与速冻技术领域。(The invention relates to a heat storage defrosting system for a refrigeration house air cooler, which comprises a refrigerating device, a heat storage device and a heat release device, wherein the refrigerating device is connected with the heat storage device; the refrigerating device comprises a compressor, a heat storage heat exchanger, a condenser, a throttling device and an evaporator which are sequentially arranged, and the evaporator is connected with the compressor to form a refrigerating circulation loop; the heat storage device comprises a heat storage tank, a heat storage pump, a heat storage heat exchanger and a heat storage valve which are sequentially arranged, and the heat storage valve is connected into the heat storage tank to form a heat storage circulation loop; the heat release device comprises a heat storage tank, a heat release pump, a heat release heat exchanger and a heat release valve which are arranged in sequence, and the heat release valve is connected into the heat storage tank to form a heat release circulation loop; the refrigerating device and the heat storage device exchange heat in the heat storage heat exchanger, and the refrigerating device and the heat release device exchange heat through the evaporator and the heat release heat exchanger. Still relate to a freezer. The invention can reduce energy consumption, operate more stably and reduce temperature fluctuation in the warehouse, and belongs to the technical field of refrigeration and quick freezing.)

1. The utility model provides a heat accumulation defrost system for freezer air-cooler which characterized in that: comprises a refrigerating device, a heat storage device and a heat release device; the refrigerating device comprises a compressor, a heat storage heat exchanger, a condenser, a throttling device and an evaporator which are sequentially arranged, and the evaporator is connected with the compressor to form a refrigerating circulation loop; the heat storage device comprises a heat storage tank, a heat storage pump, a heat storage heat exchanger and a heat storage valve which are sequentially arranged, and the heat storage valve is connected into the heat storage tank to form a heat storage circulation loop; the heat release device comprises a heat storage tank, a heat release pump, a heat release heat exchanger and a heat release valve which are arranged in sequence, and the heat release valve is connected into the heat storage tank to form a heat release circulation loop; the refrigerating device and the heat storage device exchange heat in the heat storage heat exchanger, and the refrigerating device and the heat release device exchange heat through the evaporator and the heat release heat exchanger.

2. A heat storage defrost system for a cold storage air cooler according to claim 1 further comprising: the heat storage heat exchanger is a plate heat exchanger, a tubular heat exchanger or a sleeve type heat exchanger; the heat storage tank is filled with a heat storage agent which is liquid at 0-100 ℃ and has larger specific heat capacity; the heat exchange form of the heat storage heat exchanger is countercurrent heat exchange.

3. A heat storage defrost system for a cold storage air cooler according to claim 1 further comprising: the heat release heat exchanger is a finned tube heat exchanger or a microchannel heat exchanger; the heat release heat exchanger is provided with a fan, frost is removed from the inner side and the outer side of the evaporator by utilizing the exhaust of the compressor and the heat storage of the heat storage agent, and residual liquid drops on the surface of the evaporator are evaporated to dryness, so that the defrosting time is shortened.

4. A heat storage defrost system for a cold storage air cooler according to claim 1 further comprising: the inlet of the heat storage pump and the outlet of the heat release valve are both communicated with the bottom of the heat storage tank, and the inlet of the heat release pump and the outlet of the heat storage valve are both inserted into the top of the heat storage agent in the heat storage tank through pipelines.

5. A heat storage defrost system for a cold storage air cooler according to claim 4 further comprising: during the refrigeration cycle, the heat storage pump and the heat storage valve are opened, and the heat release pump and the heat release valve are closed; during the defrosting cycle, the heat storage pump and the heat storage valve are closed, and the heat release pump and the heat release valve are opened.

6. A heat storage defrost system for a cold storage air cooler according to claim 1 further comprising: the condenser is a finned tube type heat exchanger, a micro-channel heat exchanger, a shell-and-tube type heat exchanger or a plate type heat exchanger; the throttling device is a capillary tube, a thermal expansion valve or an electromagnetic expansion valve; the evaporator is a finned tube evaporator or a micro-channel evaporator.

7. A heat storage defrost system for a cold storage air cooler according to claim 1 further comprising: the heat storage agent is a solid phase change heat storage material or a fluid heat storage material; the heat storage mode is direct heat storage or indirect heat storage of a heat-carrying agent.

8. A freezer, its characterized in that: the heat accumulation defrosting system comprises a refrigeration house body, a refrigeration house machine room and the heat accumulation defrosting system for the refrigeration house air cooler, wherein the heat accumulation defrosting system is as claimed in any one of claims 1 to 7; the compressor, the heat storage heat exchanger, the condenser, the throttling device, the heat storage tank, the heat storage pump, the heat storage valve, the heat release pump and the heat release valve are arranged in the machine room of the refrigeration house, and the heat release heat exchanger and the evaporator are arranged in the cold house.

9. A cold store according to claim 8, wherein: the device also comprises an airflow channel, a first hydraulic door, a second hydraulic door, a third hydraulic door and a fourth hydraulic door; the air flow channel is U-shaped, is horizontally arranged and comprises a first air flow section, a second air flow section and a third air flow section which are sequentially connected; the end part of the first air flow section and the end part of the second air flow section extend out of the wall body of the cold storage body, so that the air flow channel is communicated with the outside of the cold storage body; the heat release heat exchanger and the evaporator are both arranged in the first airflow section, the heat release heat exchanger is close to one side of the first hydraulic door, and the evaporator is close to one side of the fourth hydraulic door; a hydraulic door III is arranged on the lower side wall of the first airflow section and is positioned between the heat release heat exchanger and the evaporator;

during refrigeration circulation, the first hydraulic door and the second hydraulic door are closed, the third hydraulic door and the fourth hydraulic door are opened, and the airflow channel is isolated from the outside of the cold storage body and communicated with the inside of the cold storage body;

during the defrosting cycle, the first hydraulic door and the second hydraulic door are opened, the third hydraulic door and the fourth hydraulic door are closed, and the airflow channel is communicated with the outside of the cold storage body and isolated from the inside of the cold storage body.

10. A cold store according to claim 9, wherein: the device also comprises a water collecting tray, a guide pipe and a water collecting pipe; the water collecting tray is arranged at the bottom of the evaporator and is connected with the water collecting pipe through a guide pipe, and the water collecting pipe extends out of the cold storage body.

Technical Field

The invention relates to the technical field of refrigeration and quick freezing, in particular to a heat storage defrosting system for an air cooler of a refrigeration house, and the refrigeration house with the heat storage defrosting system.

Background

In the fields of food preservation and quick freezing, the frosting phenomenon is easy to occur on the surface of the air cooler due to the working conditions of low temperature and high humidity. The growth of the frost layer increases the heat exchange thermal resistance and the flow resistance between the evaporator and the low-temperature environment, the required low-temperature environment is difficult to maintain, the storage quality and the preservation of food are influenced, and in order to maintain the low-temperature working condition of the storage space, the surface of the evaporator needs to be periodically defrosted, so that the heat exchange thermal resistance and the flow resistance are reduced.

At present, the defrosting modes in the cold storage are mainly hot ammonia defrosting, hot water defrosting, manual defrosting and the like, so that the storage temperature is easy to fluctuate, the storage quality of food is influenced, and the spoilage of goods can be caused in serious cases. In addition, after defrosting is finished, liquid drops remained on the fin surface are quickly frozen when the unit recovers refrigeration, and a compact ice layer is formed on the fin surface (called as a fin surface refreezing phenomenon), so that the unit performance is quickly reduced. In the defrosting process, the defrosting heat mainly comes from the power consumption of the compressor, so the defrosting energy consumption is large, the high-low pressure switching of the system causes thermal shock to all parts of the system, and the reliability and the service life of the refrigeration system are reduced.

If the relative humidity of the environment in the warehouse is higher, the frosting speed on the surface of the air cooler is correspondingly increased, so that the defrosting interval time is shortened. Frequent temperature fluctuations will seriously affect the storage quality of the food product, resulting in increased defrost power consumption.

The existing defrosting structure has the problem of high energy consumption, and the existing refrigeration house has the problems of large temperature fluctuation of the refrigeration house, low system reliability and the like besides the problem of high energy consumption.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to: the heat storage defrosting system for the cold storage air cooler reduces energy consumption.

Another object of the invention is: provided is a refrigerator which reduces energy consumption and reduces temperature fluctuation in the refrigerator.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat accumulation defrosting system for a refrigeration house air cooler comprises a refrigerating device, a heat accumulation device and a heat release device; the refrigerating device comprises a compressor, a heat storage heat exchanger, a condenser, a throttling device and an evaporator which are sequentially arranged, and the evaporator is connected with the compressor to form a refrigerating circulation loop; the heat storage device comprises a heat storage tank, a heat storage pump, a heat storage heat exchanger and a heat storage valve which are sequentially arranged, and the heat storage valve is connected into the heat storage tank to form a heat storage circulation loop; the heat release device comprises a heat storage tank, a heat release pump, a heat release heat exchanger and a heat release valve which are arranged in sequence, and the heat release valve is connected into the heat storage tank to form a heat release circulation loop; the refrigerating device and the heat storage device exchange heat in the heat storage heat exchanger, and the refrigerating device and the heat release device exchange heat through the evaporator and the heat release heat exchanger.

Preferably, the heat storage heat exchanger is a plate heat exchanger, a tubular heat exchanger or a double-pipe heat exchanger; the heat storage tank is filled with a heat storage agent which is liquid at 0-100 ℃ and has larger specific heat capacity (such as water); the heat exchange form of the heat storage heat exchanger is countercurrent heat exchange.

Preferably, the heat release heat exchanger is a finned tube heat exchanger or a microchannel heat exchanger; the heat release heat exchanger is provided with a fan, frost is removed from the inner side and the outer side of the evaporator by utilizing the exhaust of the compressor and the heat storage of the heat storage agent, and residual liquid drops on the surface of the evaporator are evaporated to dryness, so that the defrosting time is shortened.

Preferably, the inlet of the heat storage pump and the outlet of the heat release valve are both communicated with the bottom of the heat storage tank, and the inlet of the heat release pump and the outlet of the heat storage valve are both inserted into the top of the heat storage agent in the heat storage tank through pipelines.

Preferably, during the refrigeration cycle, the heat storage pump and the heat storage valve are opened, and the heat release pump and the heat release valve are closed; during the defrosting cycle, the heat storage pump and the heat storage valve are closed, and the heat release pump and the heat release valve are opened.

Preferably, the condenser is a finned tube heat exchanger, a microchannel heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger; the throttling device is a capillary tube, a thermal expansion valve or an electromagnetic expansion valve; the evaporator is a finned tube evaporator or a micro-channel evaporator.

Preferably, the heat storage agent is a solid phase change heat storage material or a fluid heat storage material; the heat storage mode is direct heat storage or indirect heat storage of a heat-carrying agent.

A refrigeration house comprises a refrigeration house body, a refrigeration house machine room and a heat accumulation defrosting system for an air cooler of the refrigeration house; the compressor, the heat storage heat exchanger, the condenser, the throttling device, the heat storage tank, the heat storage pump, the heat storage valve, the heat release pump and the heat release valve are arranged in the machine room of the refrigeration house, and the heat release heat exchanger and the evaporator are arranged in the cold house.

Preferably, the refrigeration house further comprises an airflow channel, a first hydraulic door, a second hydraulic door, a third hydraulic door and a fourth hydraulic door; the air flow channel is U-shaped, is horizontally arranged and comprises a first air flow section, a second air flow section and a third air flow section which are sequentially connected; the end part of the first air flow section and the end part of the second air flow section extend out of the wall body of the cold storage body, so that the air flow channel is communicated with the outside of the cold storage body; the heat release heat exchanger and the evaporator are both arranged in the first airflow section, the heat release heat exchanger is close to one side of the first hydraulic door, and the evaporator is close to one side of the fourth hydraulic door; a hydraulic door III is arranged on the lower side wall of the first airflow section and is positioned between the heat release heat exchanger and the evaporator; during refrigeration circulation, the first hydraulic door and the second hydraulic door are closed, the third hydraulic door and the fourth hydraulic door are opened, and the airflow channel is isolated from the outside of the cold storage body and communicated with the inside of the cold storage body; during the defrosting cycle, the first hydraulic door and the second hydraulic door are opened, the third hydraulic door and the fourth hydraulic door are closed, and the airflow channel is communicated with the outside of the cold storage body and isolated from the inside of the cold storage body.

Preferably, the refrigeration house further comprises a water collecting disc, a guide pipe and a water collecting pipe; the water collecting tray is arranged at the bottom of the evaporator and is connected with the water collecting pipe through a guide pipe, and the water collecting pipe extends out of the cold storage body.

The principle of the invention is as follows:

the invention uses the exhaust of the compressor to heat the heat storage agent during the refrigeration cycle, and the exhaust heat of the compressor is stored in the heat storage tank for use during the defrosting cycle; the method does not need a compressor to operate during the defrosting cycle, avoids thermal shock caused by switching between high pressure and low pressure of the system, stops the compressor during the defrosting cycle, reduces the defrosting power consumption of the unit, improves the reliability of the system and prolongs the service life of the unit. Meanwhile, the opening and closing of the hydraulic door are matched, so that the damp and hot steam flowing through the evaporator in the defrosting cycle is discharged out of the warehouse, and the warehouse temperature fluctuation caused by the defrosting cycle is avoided.

In summary, the present invention has the following advantages:

1. the system accumulates the exhaust heat of the compressor in the refrigeration cycle in the heat accumulation tank through the heat accumulation agent, releases the heat accumulation in the refrigeration cycle in the heat release heat exchanger by the heat release pump during the defrosting cycle, and heats the incoming air to remove the frost on the surface of the air cooler. Compared with the traditional hot gas defrosting method, the defrosting heat is derived from the exhaust heat of the compressor during the refrigeration cycle, the heat is accumulated through the heat storage material in the heat storage tank, the precooling of the high-temperature and high-pressure refrigerant is realized, and the heat load of the condenser is reduced; the compressor does not need work and power consumption in the defrosting process, and the energy consumption is reduced while the refrigerating efficiency of the refrigerating system is improved. Secondly, the impact of the traditional high-low pressure switching of the hot defrosting to the unit is avoided, and the service life of the unit is prolonged.

2. The defrosting energy consumption is reduced, meanwhile, the large fluctuation of the warehouse temperature is avoided, and the operation efficiency of the system is improved.

3. A heat storage agent which is liquid at 0-100 ℃ and has large specific heat capacity, such as ethylene glycol, water and the like, is adopted to facilitate fluid management.

4. The heat exchange mode of the heat storage heat exchanger is countercurrent heat exchange, and the heat storage temperature of the heat storage agent can be increased.

5. During defrosting, the high-temperature heat storage agent is pumped out from the upper part of the heat storage tank, so that quick defrosting is facilitated; during heat storage, the low-temperature heat storage agent is pumped out from the bottom of the tank, so that more heat can be stored and collected.

6. For the heat storage defrosting system of the large-scale refrigeration house, the cascaded air cooler set can collect the defrosted gas to be discharged to the outside through the air exhaust port through the air inlet and exhaust gas collection flow channel and the auxiliary hydraulic equipment of each air cooler; the bottom of each air cooler evaporator is provided with a water collecting tray and a guide pipe, and the defrosting water flows into the water collecting pipe through the guide pipe and then is discharged out of the warehouse.

Drawings

Fig. 1 is a schematic structural view of a heat accumulation defrosting system for a cold storage air cooler.

Fig. 2 is a layout view of a heat accumulation defrosting system for an air cooler of a cold storage in the cold storage.

Fig. 3 is a front view of an air flow passage in the case of a refrigeration cycle.

Fig. 4 is a top view of the airflow path during a defrost cycle.

The system comprises a compressor 1, a heat storage heat exchanger 2, a condenser 3, a throttling device 4, an evaporator 5, a heat storage tank 6, a heat storage pump 7, a heat storage valve 8, a heat release pump 9, a heat release heat exchanger 10, a heat release valve 11, a cold storage body 12, a cold storage machine room 13, an air flow channel 14, a water collecting tray 15, a wall body 16, a hydraulic door I17, a hydraulic door II 18, a hydraulic door III 19 and a hydraulic door IV 20.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.