CN114543388B - Refrigerating device waste heat recovery device and refrigerating device waste heat recovery system - Google Patents

Abstract

The present invention relates to the field of heat recovery, in particular to a waste heat recovery device of a refrigeration device and a waste heat recovery system of a refrigeration device. The waste heat recovery system of a refrigeration device includes a refrigeration device, and the refrigeration device includes a main compressor, a condenser, a liquid receiver and an evaporator. Between the main compressor and the condenser, there is a main condensing pipeline and a main heat recovery branch, and a main heat exchanger is set on the main heat recovery branch; an auxiliary heat recovery branch is connected downstream of the main compressor, and the auxiliary heat recovery An auxiliary heat exchanger is set on the recovery branch road; the waste heat recovery system of the refrigeration unit also includes a heat exchange pipeline, and both the main heat exchanger and the auxiliary heat exchanger are set on the heat exchange pipeline; the waste heat recovery system of the refrigeration unit has a single refrigeration mode, The first heat recovery mode, the second heat recovery mode and the third heat recovery mode, the settings of the four modes enable the waste heat recovery system of the refrigeration device to adapt to the heat demand under various conditions, and solve the existing working mode of the existing heat recovery system Fewer, narrower issues.

Description

A refrigeration device waste heat recovery device and a refrigeration device waste heat recovery system

technical field

The invention relates to the field of heat recovery, in particular to a waste heat recovery device of a refrigeration device and a waste heat recovery system of a refrigeration device.

Background technique

Frozen food usually refers to being cooled to a central temperature of not higher than -15°C in a freezer, and then placed in a low-temperature storehouse (also known as a low-temperature freezer, a freezer for frozen objects) at -18°C for long-term storage in order to keep the food fresh. quality. If frozen food is used for reprocessing, it needs to be thawed. At present, the commonly used thawing methods for large quantities of frozen food include air thawing, water thawing, vacuum low-temperature thawing, etc., and the former two methods are the most common.

Air thawing includes low-temperature and high-humidity air thawing (thawing room temperature is about 15°C, relative humidity is 95%-98%, wind speed is about 2m/s), high-temperature and high-humidity air thawing (thawing room temperature is 25-37°C, relatively The humidity is 95% to 98%, and the wind speed is about 2m/s). When the central temperature of the frozen food rises to 4°C, the thawing is completed. The heat required for the thawing of frozen food by the air thawing method is usually provided by burning natural gas to generate high-temperature water vapor or hot water. Although outside air can be used as a heat source to provide heat for the thawing chamber in summer, the most economical method is to directly introduce the air outside the thawing chamber into the thawing chamber, but in this case the hygienic conditions of the food are more difficult to guarantee. If measures such as filtering and sterilizing the outside air are used to meet the requirements of safety and hygiene, the cost of thawing will increase. Furthermore, in the transitional season and winter, the ambient temperature is low, and it is difficult or impossible for the outdoor air in the Central Plains and northern regions of my country to provide the heat needed for thawing. Water thawing includes static water thawing and running water thawing. The temperature of the water is about 10°C. When the central temperature of the frozen food rises to 4°C, the thawing is complete. Similar to air thawing, whether it is static water thawing or flowing water thawing, heat should also be provided for the heat transfer medium (air is the heat transfer medium for air thawing, water is the heat transfer medium for water thawing). At present, the heat required for food thawing is often provided by hot water or hot steam produced by gas-fired boilers. Although burning natural gas to provide heat is simple and practical, there is almost no environmental pollution, but the cost is relatively high.

The Chinese utility model patent with the authorized announcement number CN202993717U discloses a cold storage condensation heat recovery system, which includes a cycle circuit in which a compressor, a condenser, an expansion valve, and an evaporator are connected end to end in sequence. The compressor and the condenser are connected through two Two three-way valves are connected in parallel to a pipeline, which is connected with a condensation heat recovery heat exchanger, and the water outlet of the condensation heat recovery heat exchanger is connected with the air thawing chamber or the forced convection radiator of the forced or heating unit. The compressor, condenser, expansion valve, and evaporator of the condensation heat recovery system of the cold storage are connected end to end in sequence to form a circulation circuit of the refrigeration device, and the pipeline connected in parallel through the three-way valve between the compressor and the condenser constitutes the main heat exchanger. Recovery branch, the original pipeline between the compressor and the condenser is the main condensation pipeline, the system can use the heat of condensation of the refrigeration device to thaw the frozen products through the heat exchanger on the main heat recovery branch, and can make full use of The condensing heat waste heat resources of the refrigerating device save energy, but this system does not consider the transitional season and winter, because the refrigerating device load is small, and the condensing heat of the refrigerating device is often less at this time, and the heat recovered by the condensing heat usually cannot meet the requirements. Heat required for thawing. Moreover, when the peak season of cold storage (that is, when the thawing amount of frozen food is large) is just in the transition season or winter, the heat required for thawing is large, and the contradiction between the low condensation heat that can be recovered by the cold storage refrigeration device will be more prominent. . To sum up, the existing heat recovery system has few working modes, cannot meet the thawing needs under various conditions, and has the problem of narrow application range.

Contents of the invention

The object of the present invention is to provide a waste heat recovery device of a refrigeration device, which is used to solve the technical problems of the existing heat recovery system with fewer working modes and narrow application range. The present invention also provides a waste heat recovery system of a refrigeration device comprising the above-mentioned waste heat recovery device of a refrigeration device.

The technical scheme of the waste heat recovery system of the refrigeration unit of the present invention is:

Refrigeration unit The waste heat recovery system includes a refrigeration unit. The refrigeration unit includes a main compressor, a condenser, a liquid receiver and an evaporator. The main compressor, condenser, liquid receiver and evaporator are connected in series. There is a main condensation circuit and a main heat recovery branch circuit, the main condensation circuit and the main heat recovery branch circuit are connected in parallel, and a main heat exchanger is installed on the main heat recovery branch circuit; Pipeline valve, the main heat recovery branch is equipped with a heat recovery valve that controls the on-off of the main heat recovery branch, or a reversing valve is provided downstream of the main compressor, and the reversing valve is used to make the main condensing pipeline and the main heat return One of the inlet and branch paths is connected with the main compressor; the downstream of the main compressor is connected with an auxiliary heat recovery branch, and the auxiliary heat recovery branch is equipped with an auxiliary compressor, an auxiliary heat exchanger and a control auxiliary heat recovery branch On-off branch valve; the auxiliary heat recovery branch is connected in parallel with the main heat recovery branch, and the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the liquid receiver or the auxiliary heat recovery branch The downstream end is connected to the liquid receiver; the waste heat recovery system of the refrigeration device also includes a heat exchange pipeline, which is equipped with a heat dissipation device to transfer heat to the heat-using area. On the heat pipeline; the waste heat recovery system of the refrigeration device has a single cooling mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode;

When the waste heat recovery system of the refrigeration unit is in the cooling-only mode, the main compressor is connected to the condenser and disconnected from the main heat exchanger and the auxiliary heat exchanger, and neither the main heat exchanger nor the auxiliary heat exchanger works;

When the waste heat recovery system of the refrigeration device is in the first heat recovery mode, the main compressor is connected to the main heat exchanger, and is disconnected from the condenser and auxiliary heat exchanger, and the main heat exchanger works;

When the waste heat recovery system of the refrigeration device is in the second heat recovery mode, the main compressor communicates with the condenser and communicates with the auxiliary heat exchanger, and is disconnected from the main heat exchanger, and the auxiliary heat exchanger works;

When the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the main compressor communicates with the main heat exchanger, communicates with the auxiliary heat exchanger, and is disconnected from the condenser, and both the auxiliary heat exchanger and the main heat exchanger work.

Beneficial effects: when the waste heat recovery system of the refrigeration device is in the single refrigeration mode, the condensing line valve is opened, the heat recovery valve and the branch valve are closed, or the reversing valve is connected to the main compressor and the condenser, and the branch valve is closed. The device is operating normally, and neither the main heat exchanger nor the auxiliary heat exchanger is working; when it is necessary to transfer heat to the heat-using area and the heat transferred by the refrigerant can meet the requirements of the heat-using area when the refrigeration device is in normal operation, the waste heat recovery system of the refrigeration device In the first heat recovery mode, the condensing line valve and branch valve are closed, the heat recovery valve is opened, or the reversing valve is connected to the main compressor and the main heat exchanger, and the branch valve is closed to ensure the normal operation of the refrigeration device while , the main heat exchanger is also in the working state, the medium in the heat exchange pipeline will be heated, and when the medium in the heat exchange pipeline flows through the heat sink, it will transfer heat to the heat-using area through the heat-dissipating device to heat the heat-using area ; When it is necessary to transfer heat to the heat-using area, and the heat transferred by the refrigerant cannot meet the requirements of the heat-using area when the refrigeration device is in normal operation, and the condensation pressure of the refrigeration device is low, the waste heat recovery system of the refrigeration device is in the second heat recovery mode, The condensing line valve and branch valve are opened, the heat recovery valve is closed, or the reversing valve is connected to the main compressor and the condenser, the branch valve is opened, and part of the refrigerant in the refrigeration unit flows to the main condensation line to ensure the normal operation of the refrigeration unit. The other part flows to the auxiliary heat recovery branch. The refrigerant flowing to the auxiliary heat recovery branch is further compressed by the auxiliary compressor and then flows to the auxiliary heat exchanger. After being compressed by the auxiliary compressor, the refrigerant passes through the auxiliary heat exchanger. When the medium in the heat exchange pipeline is heated, it will transfer heat to the heat-using area through the heat-dissipating device when the medium in the heat-exchanging pipeline is heated, so as to heat the heat-using area; For heat transfer in the heat-using area, when the refrigeration device is in normal operation, the heat transferred by the refrigerant cannot meet the requirements of the heat-using area, and when the condensation pressure of the refrigeration device is normal, the waste heat recovery system of the refrigeration device is in the third heat recovery mode, and the heat recovery valve, The branch valve is opened, the condensing pipeline valve is closed, or the reversing valve is connected to the main compressor and the main heat exchanger, the branch valve is opened, and part of the refrigerant in the refrigeration unit flows to the condenser through the main heat recovery branch to ensure During the normal operation of the refrigeration device, the other part flows to the auxiliary heat recovery branch, and the refrigerant flowing to the auxiliary heat recovery branch will be further compressed by the auxiliary compressor. The medium in the pipeline is heated after flowing through the main heat exchanger and the auxiliary heat exchanger. After the medium in the heat exchange pipeline is heated, it will transfer heat to the heat-using area through the heat sink to heat the heat-using area. The waste heat recovery system of the refrigeration device of the present invention enables the waste heat recovery system of the refrigeration device to adapt to the heat demand under various conditions through the setting of the above four modes, and solves the problem that the existing heat recovery system has fewer working modes and a wider scope of application. narrow question.

Further, the heat exchange pipeline includes a main heat exchange pipeline and an auxiliary heat exchange branch circuit, the main heat exchanger is arranged on the main heat exchange pipeline, the main heat exchange pipeline includes a control section downstream of the main heat exchanger, and a useful The main heat exchange valve used to control the on-off of the control section, and the auxiliary heat exchange branch are connected in parallel with the control section.

Beneficial effects: the arrangement of the heat exchange pipeline makes it possible to choose to connect the auxiliary heat exchange branch in series with the main heat exchange pipeline according to the needs, which simplifies the layout of the pipeline and makes the working mode more flexible.

Further, an auxiliary heat exchange valve for controlling on-off of the auxiliary heat exchange branch is arranged on the auxiliary heat exchange branch.

Beneficial effects: the setting of the auxiliary heat exchange valve enables more flexible control of the heat exchange pipeline.

Further, an auxiliary branch throttling mechanism is provided downstream of the auxiliary heat exchanger on the auxiliary heat recovery branch road.

Beneficial effects: the setting of the throttling mechanism of the auxiliary branch can control the condensation pressure of the refrigerant in the auxiliary heat recovery branch to the condensation pressure of the refrigeration device in normal operation, so as to reduce the refrigerant flowing through the auxiliary heat recovery branch. The effect of the refrigerant on the operation of the refrigeration unit.

Further, the heat exchange pipeline is a waterway, and an expansion tank is arranged on the heat exchange pipeline.

Beneficial effects: the expansion water tank can accommodate the volume change of water caused by the temperature change, effectively reducing the probability of heat exchange pipeline rupture due to excessive water pressure in the heat exchange pipeline.

Further, the waste heat recovery system of the refrigerating device includes a temperature controller for monitoring the temperature of the hot area, and a temperature control valve is installed on the heat exchange pipeline, and the temperature control valve is used to control the on-off of the heat exchange pipeline. The temperature to control the opening and closing of the temperature control valve.

Beneficial effects: the setting of the temperature controller and the temperature control valve can monitor the temperature of the heat-using area in real time, and can control the opening or closing of the temperature control valve according to the temperature of the heat-using area to control the on-off of the heat exchange pipeline, so as to Real-time adjustment of the temperature of the hot area can realize precise control of the temperature of the hot area.

Further, the heat exchange pipeline is provided with a manual control valve for controlling the on-off of the heat exchange pipeline.

Beneficial effects: after the temperature control valve fails, the heat exchange pipeline can be manually controlled through the manual control valve, and the safety factor is high.

Further, when the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the auxiliary heat exchanger is located downstream of the main heat exchanger on the heat exchange pipeline.

Beneficial effects: the temperature of the refrigerant is higher after secondary compression by the auxiliary compressor, and the heat can be quickly transferred to the medium passing through the main heat exchanger in the heat exchange pipeline after passing through the auxiliary heat exchanger, thereby improving the heat transfer efficiency, Ensure the supply of heat required by the heat-using area.

The technical scheme of the refrigeration unit waste heat recovery device of the present invention is:

The waste heat recovery device of the refrigerating device includes a refrigerating device, which includes a main compressor, a condenser, a liquid receiver and an evaporator. The main compressor, condenser, liquid receiver and evaporator are connected in series, and the main compressor and the condenser are set There is a main condensation circuit and a main heat recovery branch circuit, the main condensation circuit and the main heat recovery branch circuit are connected in parallel, and a main heat exchanger is installed on the main heat recovery branch circuit; Pipeline valve, the main heat recovery branch is equipped with a heat recovery valve that controls the on-off of the main heat recovery branch, or a reversing valve is provided downstream of the main compressor, and the reversing valve is used to make the main condensing pipeline and the main heat return One of the inlet and branch paths is connected with the main compressor; the downstream of the main compressor is connected with an auxiliary heat recovery branch, and the auxiliary heat recovery branch is equipped with an auxiliary compressor, an auxiliary heat exchanger and a control auxiliary heat recovery branch On-off branch valve; the auxiliary heat recovery branch is connected in parallel with the main heat recovery branch, and the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the liquid receiver or the auxiliary heat recovery branch The downstream end is connected to the liquid receiver; the waste heat recovery device of the refrigeration device has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode;

When the waste heat recovery device of the refrigeration device is in the single cooling mode, the main compressor is connected to the condenser, and is disconnected from the main heat exchanger and the auxiliary heat exchanger, and neither the main heat exchanger nor the auxiliary heat exchanger work;

When the waste heat recovery device of the refrigeration device is in the first heat recovery mode, the main compressor is connected to the main heat exchanger, and is disconnected from the condenser and the auxiliary heat exchanger, and the main heat exchanger works;

When the waste heat recovery device of the refrigeration device is in the second heat recovery mode, the main compressor communicates with the condenser and communicates with the auxiliary heat exchanger, and is disconnected from the main heat exchanger, and the auxiliary heat exchanger works;

When the waste heat recovery device of the refrigeration device is in the third heat recovery mode, the main compressor communicates with the main heat exchanger, communicates with the auxiliary heat exchanger, and is disconnected from the condenser, and both the auxiliary heat exchanger and the main heat exchanger work.

Beneficial effects: when the waste heat recovery device of the refrigeration device is in the single refrigeration mode, the condensing line valve is opened, the heat recovery valve and the branch valve are closed, or the reversing valve is connected to the main compressor and the condenser, and the branch valve is closed. The device is running normally, and neither the main heat exchanger nor the auxiliary heat exchanger is working; when it is necessary to transfer heat to the heat-using area and the heat transferred by the refrigerant can meet the requirements of the heat-using area when the refrigeration device is in normal operation, the waste heat recovery device of the refrigeration device In the first heat recovery mode, the condensing line valve and branch valve are closed, the heat recovery valve is opened, or the reversing valve is connected to the main compressor and the main heat exchanger, and the branch valve is closed to ensure the normal operation of the refrigeration device while , the main heat exchanger is also in working condition, and the waste heat recovery device of the refrigeration device can transfer heat to the place where heat is needed through the main heat exchanger; when heat needs to be transferred to the heat-using area, the heat transferred by the refrigerant cannot When the requirements of the heat-using area are met, and the condensing pressure of the refrigeration unit is low, the waste heat recovery device of the refrigeration unit is in the second heat recovery mode, the condensing line valve and branch valve are opened, the heat recovery valve is closed, or the reversing valve is turned on The main compressor and condenser, the branch valve is opened, part of the refrigerant in the refrigeration unit flows to the main condensing line to ensure the normal operation of the refrigeration unit, and the other part flows to the auxiliary heat recovery branch, and flows to the refrigeration of the auxiliary heat recovery branch After being further compressed by the auxiliary compressor, the refrigerant will flow to the auxiliary heat exchanger. After being compressed by the auxiliary compressor, the refrigerant can transfer more heat to the place where heat is needed. The waste heat recovery device of the refrigeration device can pass through the auxiliary heat exchanger. The auxiliary heat exchanger transfers heat to the place where heat is needed; when it is necessary to transfer heat to the heat-using area, the heat transferred by the refrigerant cannot meet the requirements of the heat-using area when the refrigeration device is operating normally, and when the condensing pressure of the refrigeration device is normal, the refrigeration The waste heat recovery device of the device is in the third heat recovery mode, the heat recovery valve and branch valve are opened, the condensing line valve is closed, or the reversing valve is connected to the main compressor and the main heat exchanger, the branch valve is opened, and the Part of the refrigerant flows to the condenser through the main heat recovery branch to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch. The refrigerant flowing to the auxiliary heat recovery branch will be further compressed by the auxiliary compressor. Both the heat exchanger and the auxiliary heat exchanger are in working condition, and the waste heat recovery device of the refrigeration device can transfer heat to the place where heat is needed through the main heat exchanger and the auxiliary heat exchanger. The waste heat recovery device of the refrigeration device of the present invention enables the waste heat recovery device of the refrigeration device to adapt to the heat demand under various conditions through the setting of the above four modes, and solves the problem that the existing heat recovery system has fewer working modes and a wider scope of application. narrow question.

Further, an auxiliary branch throttling mechanism is provided downstream of the auxiliary heat exchanger on the auxiliary heat recovery branch road.

Beneficial effects: the setting of the throttling mechanism of the auxiliary branch can control the condensation pressure of the refrigerant in the auxiliary heat recovery branch to the condensation pressure of the refrigeration device in normal operation, so as to reduce the refrigerant flowing through the auxiliary heat recovery branch. The effect of the refrigerant on the operation of the refrigeration unit.

Description of drawings

Fig. 1 is the schematic diagram when the frozen food is thawed by the air thawing method in Embodiment 1 of the waste heat recovery system of the refrigeration device of the present invention;

Fig. 2 is a schematic diagram of the embodiment 7 of the waste heat recovery system of the refrigeration device of the present invention when the frozen food is thawed by the flowing water thawing method.

Explanation of reference signs: 1. heat exchange pipeline; 2. thawing chamber; 3. main compressor; 4. condenser; 5. liquid receiver; 6. evaporator; 7. throttling mechanism of refrigeration device; Food; 9. Condensation main line; 10. Condensation line valve; 11. Main heat recovery branch; 12. Main heat exchanger; 13. Heat recovery valve; 14. Auxiliary heat recovery branch; 15. Branch Valve; 16. Auxiliary compressor; 17. Auxiliary heat exchanger; 18. Auxiliary branch throttling mechanism; 19. Main heat exchange circuit; 20. Auxiliary heat exchange branch; 21. Control section; 22. Main heat exchange valve 23. Auxiliary heat exchange valve; 24. Cooling device; 25. Humidifier; 26. Temperature control valve; 27. Expansion water tank; 28. Manual control valve;

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that in the specific embodiments of the present invention, possible terms such as "first" and "second" and other relative terms are only used to distinguish one entity or operation from another entity or operation , without necessarily requiring or implying that an actual relationship or order exists between these entities or operations. Furthermore, the possible occurrences of terms such as "comprises", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, article, or apparatus are also included. Without further limitations, the phrase "comprising a ..." and other qualified elements that may appear does not exclude the presence of additional identical elements in the process, method, article, or device that includes said elements.

In the description of the present invention, unless otherwise clearly specified and limited, terms that may appear such as "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; may be mechanically connected, may also be electrically connected; may be directly connected, may also be indirectly connected through an intermediary, or may be internal communication between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

In the description of the present invention, unless otherwise clearly specified and limited, the term "has to be" that may appear should be understood in a broad sense, for example, the object of "has to be" can be a part of the body, or it can be separated from the body Arranged and connected on the body, the connection can be detachable or non-detachable. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

The present invention will be further described in detail below in conjunction with the examples.

Embodiment 1 of the waste heat recovery system of the refrigeration device provided in the present invention:

As shown in Figure 1, the waste heat recovery system of the refrigeration device includes a waste heat recovery device of the refrigeration device, a heat exchange pipeline 1, and a thawing chamber 2. The food can be frozen in the warehouse to maintain the quality of the food. The refrigerating device includes a circulation loop connected in series by the main compressor 3, the condenser 4, the liquid receiver 5, and the evaporator 6. There are four main compressors 3 and they are connected in parallel to form a compressor parallel unit. 5 and the evaporator 6 are provided with a refrigeration device throttling mechanism 7, and the refrigerant circulates in the circulation circuit of the refrigeration device, and the refrigerant will be converted into a high-temperature and high-pressure gas under the action of the main compressor 3. After passing through the condenser 4, the heat is released and turned into a low-temperature liquid. The refrigerant in a low-temperature liquid state will enter the evaporator 6 after passing through the liquid receiver 5 and the throttling mechanism 7 of the refrigeration device. When the refrigerant is in the evaporator 6, it will absorb The heat is converted into gas, and the refrigerant in the gas state enters the main compressor 3 again, and is converted into a high-temperature and high-pressure gas under the action of the main compressor 3, and the refrigerant circulates in the circulation circuit of the refrigeration device, thereby Realize the refrigeration function of the refrigeration device. The structure and working principle of the refrigeration device are existing technologies. Under the premise that the basic working principle remains unchanged, the structure of the refrigeration device can be adjusted appropriately. refrigeration unit.

The waste heat recovery system of the refrigeration device of the present invention is to make full use of the heat of the refrigerant in the state of high-temperature and high-pressure gas to heat the medium in the heat exchange pipeline 1, and then use the heat exchange pipeline 1 to transfer heat to the heat-using area. In this embodiment, the thawing chamber 2 is a heat utilization area, and the heat exchange pipeline 1 transfers heat to the thawing chamber 2 to thaw the frozen food 8 in the thawing chamber 2 .

The pipeline between the compressor parallel unit of the refrigeration device and the condenser 4 is the main condensing pipeline 9, on which the main condensing pipeline 9 is connected in series with a condensing pipeline valve 10 for turning on and off the condensing pipeline, and on the main condensing pipeline 9, a main heat return circuit is connected in parallel. The main heat recovery branch 11 and the main heat recovery branch 11 are connected in series with a main heat exchanger 12 and a heat recovery valve 13 for controlling the on-off of the main heat recovery branch 11 . In addition, an auxiliary heat recovery branch 14 is connected downstream of the main compressor 3, the upstream end of the auxiliary heat recovery branch 14 is connected to the compressor parallel unit, and the downstream end of the auxiliary heat recovery branch 14 is connected to the liquid accumulator. 5 connections. A branch valve 15 , an auxiliary compressor 16 , an auxiliary heat exchanger 17 and an auxiliary branch throttling mechanism 18 are sequentially connected in series on the auxiliary heat recovery branch 14 . The main heat exchanger 12 and the auxiliary heat exchanger 17 are common structures in the prior art, and the specific structures will not be repeated. When the refrigerant in the state of high-temperature and high-pressure gas flows through the main heat recovery branch 11, the main heat exchanger 12 It is used to transfer the heat of the refrigerant to the medium in the heat exchange pipeline 1. When the refrigerant in the state of high-temperature and high-pressure gas flows through the auxiliary heat recovery branch 14, the auxiliary heat exchanger 17 is used to transfer the heat of the refrigerant Transfer to the medium in the heat exchange line 1.

The heat exchange pipeline 1 includes a main heat exchange pipeline 19, the main heat exchanger 12 is connected in series on the main heat exchange pipeline 19, and the main heat exchange pipeline 19 is connected with an auxiliary heat exchange branch 20 in parallel with the pipeline downstream of the main heat exchanger 12. The auxiliary heat exchanger 17 is connected in series to the auxiliary heat exchange branch 20, and the auxiliary heat exchange valve 23 for controlling the on-off of the auxiliary heat exchange branch 20 is also connected in series on the auxiliary heat exchange branch 20. The parallel pipeline section of the thermal branch 20 is the control section 21 , and the main heat exchange valve 22 is connected in series on the control section 21 , and the main heat exchange valve 22 is used to control the on-off of the control section 21 . In this embodiment, the heat exchange pipeline 1 is a water circuit, and the medium flowing in the heat exchange loop is water. In other embodiments, the heat exchange pipeline can also be a gas circuit, and the medium flowing in the heat exchange pipeline is gas.

A radiator 24 is connected in series on the heat exchange pipeline 1. When the water in the heat exchange pipeline 1 is heated and flows through the radiator 24, the radiator 24 will transfer heat to the air in the thawing chamber 2 to cool the air in the thawing chamber 2. The air is heated, and the air in the thawing chamber 2 transfers heat to the frozen food 8 to thaw the frozen food 8 . In an embodiment, the heat dissipation device 24 is a heat exchanger, and in other embodiments, the heat dissipation device may also be a heat sink or other device capable of transferring heat to the outside.

The waste heat recovery system of the refrigeration device of the present invention has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode.

When the frozen food 8 does not need to be thawed, the waste heat recovery system of the refrigeration device is in the single refrigeration mode. The condensation pipeline valve 10 is opened, the heat recovery valve 13 and the bypass valve 15 are closed, that is, the main compressor 3 communicates with the condenser 4, and is disconnected from the main heat exchanger 12 and the auxiliary heat exchanger 17, and the main heat exchanger 12 Both the auxiliary heat exchanger 17 and the auxiliary heat exchanger 17 are not working, and all valves on the heat exchange pipeline 1 are in a closed state. At this time, the refrigeration device operates normally to cool the low-temperature storage.

When the frozen food 8 needs to be thawed, and the refrigerating device is operating normally, and the heat of the refrigerant in the state of high-temperature and high-pressure gas can meet the heat required for thawing the frozen food 8, the waste heat recovery system of the refrigerating device is in the first heat recovery mode, and the condensing pipeline The valve 10 and the branch valve 15 are closed, and the heat recovery valve 13 is opened, that is, the main compressor 3 communicates with the main heat exchanger 12, and is disconnected from the condenser 4 and the auxiliary heat exchanger 17, and the main heat exchanger 12 works, exchanging The main heat exchange valve 22 on the heat pipeline 1 is opened, and the auxiliary heat exchange valve 23 is closed. The refrigerant in the state of high-temperature and high-pressure gas in the refrigeration device will flow to the condenser 4 through the main heat recovery branch 11, so as to ensure the normal operation of the refrigeration device, while the main heat exchanger 12 on the main heat recovery branch 11 is in the In the working state, the water in the heat exchange pipeline 1 will be heated, and when the water in the heat exchange pipeline 1 flows through the cooling device 24, it will transfer heat to the air in the thawing chamber 2 through the cooling device 24, so as to cool the air in the thawing chamber 2. The air is heated, and the frozen food 8 is thawed.

When the frozen food 8 needs to be thawed and the refrigerating device operates normally, the heat of the refrigerant in the high-temperature and high-pressure gas state cannot satisfy the heat required for thawing the frozen food 8 (for example, in winter or transitional seasons, the load of the refrigerating device is small, in this case The heat of the refrigerant in the state of high-temperature and high-pressure gas cannot meet the heat required for thawing the frozen food 8), and at the same time, when the condensing pressure of the refrigerating device is low (condensing pressure is lower than 8bar), the waste heat recovery system of the refrigerating device is in the second heat recovery mode, the condensation pipeline valve 10 and branch valve 15 are opened, and the heat recovery valve 13 is closed, that is, the main compressor 3 communicates with the condenser 4 and the auxiliary heat exchanger 17, and is disconnected from the main heat exchanger 12, and the auxiliary The heat exchanger 17 is working, the main heat exchange valve 22 on the heat exchange pipeline 1 is closed, and the auxiliary heat exchange valve 23 is opened. Part of the refrigerant in the state of high-temperature and high-pressure gas in the refrigeration device flows to the main condensing line 9 to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch 14, which is in the state of high-temperature and high-pressure gas After being further compressed by the auxiliary compressor 16, the refrigerant will flow to the auxiliary heat exchanger 17. After being compressed by the auxiliary compressor 16 and passing through the auxiliary heat exchanger 17, the refrigerant can transfer more water to the heat exchange pipeline 1. heat. When the water in the heat exchange pipeline 1 is heated, it will transfer heat to the air in the thawing chamber 2 through the heat radiating device 24 to heat the air in the thawing chamber 2, and then the frozen food 8 is thawed.

When the frozen food 8 needs to be thawed and the refrigerating device operates normally, the heat of the refrigerant in the high-temperature and high-pressure gas state cannot satisfy the heat required for thawing the frozen food 8 (for example, in winter or transitional seasons, the load of the refrigerating device is small, in this case The heat of the refrigerant in the state of high-temperature and high-pressure gas cannot meet the heat required for thawing of frozen food 8), and when the condensing pressure of the refrigerating device is normal (condensing pressure is higher than 8bar), the waste heat recovery system of the refrigerating device is in the third heat recovery mode , the heat recovery valve 13 and the bypass valve 15 are opened, and the condensation pipeline valve 10 is closed, that is, the main compressor 3 communicates with the main heat exchanger 12 and the auxiliary heat exchanger 17, and is disconnected from the condenser 4, and the auxiliary exchanger Both the heat exchanger 17 and the main heat exchanger 12 are working, the main heat exchange valve 22 on the heat exchange pipeline 1 is closed, and the auxiliary heat exchange valve 23 is opened. Part of the refrigerant in the state of high-temperature and high-pressure gas in the refrigeration device flows to the condenser 4 through the main heat recovery branch 11 to ensure the normal operation of the refrigeration device, and the other part flows to the auxiliary heat recovery branch 14 to the auxiliary heat recovery branch The refrigerant in the high-temperature and high-pressure gas state of 14 will be further compressed by the auxiliary compressor 16, the main heat exchanger 12 and the auxiliary heat exchanger 17 are both in working state, and the water in the heat exchange pipeline 1 flows through the main heat exchanger 12 in turn After being heated with the auxiliary heat exchanger 17, the water in the heat exchange pipeline 1 will transfer heat to the air in the thawing chamber 2 through the cooling device 24 after being heated, so as to heat the air in the thawing chamber 2, and then freeze the food 8 be thawed.

The waste heat recovery system of the refrigerating device of the present invention can use the heat recovery of the refrigerant in the state of high-temperature and high-pressure gas to thaw food through the setting of the above four modes, reduce environmental "thermal pollution" and reduce energy consumption such as burning natural gas. The effect of energy saving and emission reduction is remarkable. In addition, the waste heat recovery system of the refrigeration device of the present invention comprehensively considers the various matching situations between the heat of the refrigerant in the high-temperature and high-pressure gas state and the heat required for thawing in different seasons, and adopts targeted solutions for different situations, so that refrigeration The waste heat recovery system of the device can run all seasons.

It should be noted that, in the present embodiment, the thawing chamber 2 adopts the air thawing method to the thawing of the frozen food 8. In order to better thaw the frozen food 8, a humidity controller (humidity controller is used) is provided in the thawing chamber 2. In the monitoring figure, the humidity at C in the thawing chamber 2) and the humidifier 25, the humidity controller is used to monitor the humidity in the thawing chamber 2 and control the opening and closing of the humidifier 25, when the humidity in the thawing chamber 2 is lower than 95% , the humidity controller controls the humidifier 25 to open, and the humidifier 25 humidifies the air in the thawing chamber 2. When the humidity in the thawing chamber 2 reaches 98%, the humidity controller controls the humidifier 25 to close. The heat exchange pipeline 1 is also connected with a temperature controller (the temperature controller is used to monitor the temperature at A in the thawing chamber 2 in the figure). Correspondingly, a temperature control valve 26 is connected in series on the heat exchange pipeline 1, and the temperature controller is used for Monitor the temperature in the thawing chamber 2 and control the opening and closing of the temperature control valve 26 according to the monitored temperature. When the temperature in the thawing chamber 2 was lower than 13°, the temperature controller controlled the temperature control valve 26 to remain open, and the cooling device 24 could continuously transfer heat to the thawing chamber 2. When the temperature in the thawing chamber 2 reached 15°, the temperature The controller controls the temperature control valve 26 to close, and the cooling device 24 stops transferring heat to the thawing chamber 2 .

In addition, the frozen food 8 is provided with a temperature sensor (at B in the figure), and the temperature sensor is used to monitor the temperature of the frozen food 8 . In this embodiment, the humidity controller, temperature controller, temperature sensor and the above-mentioned various valves are all controlled by the PLC system, and the PLC system will judge that the waste heat recovery system of the refrigeration device is in a mode according to the temperature rise rate of the frozen food 8 If the heating rate of the frozen food is too slow, it is determined that the waste heat recovery system of the refrigeration device is in this mode and cannot meet the thawing demand, and the PLC system will control the valve to switch the mode of the waste heat recovery system of the refrigeration device so that The waste heat recovery system of the refrigeration unit can meet the needs of thawing.

More specifically, a manual control valve 28 is connected in series on the heat exchange pipeline 1. Correspondingly, a thermometer is provided in the thawing chamber 2. When the temperature control valve 26 fails, the temperature displayed by the thermometer can be manually adjusted. The control valve 28 manually controls the on-off of the heat exchange pipeline 1 .

In this embodiment, since the heat exchange pipeline 1 is a water circuit, an expansion tank 27 is connected to the loop pipeline, and the expansion tank 27 is used to accommodate the volume change of water caused by the temperature change, effectively reducing The water pressure in the pipeline is too high to cause the possibility of rupture of the heat exchange pipeline. The expansion tank 27 is a common technology in the prior art, and its specific structure will not be repeated here. It should be noted that the water circulation in the heat exchange pipeline 1 is a gravity circulation, that is, the water in the heat exchange pipeline 1 is heated by the main heat exchanger 12 and the auxiliary heat exchanger 17 and the unheated water is formed. The difference in density drives the water to circulate in the heat exchange pipeline 1. The heat exchange pipeline 1 adopts gravity circulation, and there is no other power equipment such as water pumps, so the energy saving effect is good. Of course, in other embodiments, the heat exchange pipeline may use a water pump to drive the water in the heat exchange pipeline to circulate. In addition, in order to speed up the thawing speed of the frozen food 8, in this embodiment, a fan is provided in the thawing chamber 2 to make the air flow.

Embodiment 2 of the waste heat recovery system of the refrigerating device of the present invention is different from Embodiment 1 in that no condensing pipeline valve is set on the main condensing line, and no heat recovery valve is set on the main heat recovery branch line. A reversing valve is arranged on the pipeline, and the reversing valve is connected to the main condensation pipeline and the main heat recovery branch. In this embodiment, one of the main condensation pipeline and the main heat recovery branch is controlled to The compressors are connected in parallel.

Embodiment 3 of the waste heat recovery system of a refrigeration device of the present invention is different from Embodiment 1 in that in this embodiment, the downstream end of the auxiliary heat recovery branch is connected to the pipeline between the condenser and the liquid receiver.

Embodiment 4 of the waste heat recovery system of a refrigeration device of the present invention is different from Embodiment 1 in that the heat exchange pipeline only includes the main heat exchange pipeline, and the main heat exchanger and the auxiliary heat exchanger are connected in series in the main heat exchange pipeline.

Embodiment 5 of the waste heat recovery system of a refrigeration device of the present invention is different from Embodiment 1 in that in this embodiment, no auxiliary heat exchange valve is provided on the auxiliary heat exchange branch, and the auxiliary heat exchange branch always maintains a passage state.

Embodiment 6 of the waste heat recovery system of a refrigeration device of the present invention is different from Embodiment 1 in that no temperature controller is installed in the thawing chamber, no temperature control valve is installed on the heat exchange pipeline, and a thermometer is installed in the thawing chamber. In this embodiment According to the temperature displayed by the thermometer, the on-off of the heat exchange pipeline is manually controlled through the manual control valve. Or in other embodiments, no manual control valve is set on the heat exchange pipeline, and the temperature controller is used to monitor the temperature in the thawing chamber, and control the opening and closing of the temperature control valve according to the monitored temperature to control the on-off of the heat exchange pipeline. .

Embodiment 7 of the waste heat recovery system of a refrigeration device of the present invention is different from Embodiment 1 in that, as shown in FIG. Immersed in the water in the thawing pool 29, the temperature monitored by the temperature controller is the water temperature in the thawing pool 29, the thawing pool 29 is provided with an agitator 30 to stir the water in the thawing pool 29, so that the water in the thawing pool 29 The water is in a flow circulation state, and the water temperature in the thawing pool 29 is relatively uniform. In this embodiment, the waste heat recovery system of the refrigeration device adopts the thawing method of running water to thaw the frozen food 8, and the cooling device 24 is used to thaw the frozen food 8 in the thawing pool 29. of water for heating.

Embodiment 8 of the waste heat recovery system of the refrigeration device of the present invention is different from Embodiment 7 in that no agitator is provided in the thawing pool, so the water in the thawing pool is in a stable state. Food thawing is a thawing method using hydrostatic thawing.

In the embodiment of the waste heat recovery device of the refrigeration device of the present invention, the structure of the waste heat recovery device of the refrigeration device is the same as the structure of the waste heat recovery device of the refrigeration device in any embodiment of the waste heat recovery system of the refrigeration device above, and will not be repeated here.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.

Claims (10)

1. A refrigerating device waste heat recovery system, comprising a refrigerating device, the refrigerating device comprising a main compressor (3), a condenser (4), a liquid receiver (5) and an evaporator (6), the main compressor (3), The condenser (4), the liquid receiver (5) and the evaporator (6) are connected in series, and a condensing main pipeline (9) and a main heat recovery branch circuit ( 11), the condensing main line (9) is connected in parallel with the main heat recovery branch (11), the main heat recovery branch (11) is provided with a main heat exchanger (12); the condensing main line (9) is provided with A condensing line valve (10) for controlling the on-off of the main condensing line (9), and a heat recovery valve (13) for controlling the on-off of the main heat recovery branch (11) is arranged on the main heat recovery branch (11), Or a reversing valve is arranged downstream of the main compressor (3), and the reversing valve is used to communicate with the main compressor (3) in one of the main condensing pipeline (9) and the main heat recovery branch (11); Yes, the auxiliary heat recovery branch (14) is connected downstream of the main compressor (3), and the auxiliary heat recovery branch (14) is equipped with an auxiliary compressor (16), an auxiliary heat exchanger (17) and a control The branch valve (15) for switching on and off the auxiliary heat recovery branch (14); the auxiliary heat recovery branch (14) is connected in parallel with the main heat recovery branch (11), and the auxiliary heat recovery branch (14) is downstream The end is connected to the pipeline between the condenser (4) and the liquid receiver (5) or the downstream end of the auxiliary heat recovery branch (14) is connected to the liquid receiver (5); the waste heat recovery system of the refrigeration device also includes a heat exchanger The heat pipe (1), the heat exchange pipe (1) is provided with a cooling device (24) that transfers heat to the heat-using area, and the main heat exchanger (12) and the auxiliary heat exchanger (17) are all arranged on the heat exchange On the pipeline (1); the waste heat recovery system of the refrigeration device has a single refrigeration mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode; When the waste heat recovery system of the refrigeration device is in the single refrigeration mode, the main compressor (3) is connected to the condenser (4), and is disconnected from the main heat exchanger (12) and the auxiliary heat exchanger (17). The main heat exchanger ( 12) Neither the auxiliary heat exchanger (17) works; When the waste heat recovery system of the refrigeration device is in the first heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12), and is disconnected from the condenser (4) and auxiliary heat exchanger (17). Device (12) works; When the waste heat recovery system of the refrigeration device is in the second heat recovery mode, the main compressor (3) communicates with the condenser (4) and communicates with the auxiliary heat exchanger (17), and is disconnected from the main heat exchanger (12). Heat exchanger (17) work; When the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12) and the auxiliary heat exchanger (17), and is disconnected from the condenser (4). Both heat exchanger (17) and main heat exchanger (12) work. 2. The waste heat recovery system of a refrigeration device according to claim 1, characterized in that the heat exchange pipeline (1) includes a main heat exchange pipeline (19) and an auxiliary heat exchange branch circuit (20), and the main heat exchanger (12 ) is arranged on the heat exchange main pipeline (19), the heat exchange main pipeline (19) includes a control section (21) downstream of the main heat exchanger (12), and the control section (21) is provided with a control section (21) ) on-off main heat exchange valve (22), the auxiliary heat exchange branch (20) is connected in parallel with the control section (21). 3. The waste heat recovery system of the refrigeration device according to claim 2, characterized in that, the auxiliary heat exchange branch (20) is provided with an auxiliary heat exchange valve (23) for controlling the on-off of the auxiliary heat exchange branch (20) . 4. The waste heat recovery system of a refrigeration device according to any one of claims 1-3, characterized in that, the auxiliary heat recovery branch (14) is provided with an auxiliary branch downstream of the auxiliary heat exchanger (17) Throttle mechanism (18). 5. The waste heat recovery system of a refrigeration device according to any one of claims 1-3, characterized in that the heat exchange pipeline (1) is a waterway, and the heat exchange pipeline (1) is provided with an expansion tank (27). 6. The waste heat recovery system of the refrigeration device according to any one of claims 1-3, characterized in that the waste heat recovery system of the refrigeration device includes a temperature controller for monitoring the temperature of the hot area, and the heat exchange pipeline (1) A temperature control valve (26) is provided, and the temperature control valve (26) is used to control the on-off of the heat exchange pipeline (1), and the temperature controller controls the opening and closing of the temperature control valve (26) according to the monitored temperature. 7. The waste heat recovery system of the refrigeration device according to claim 6, characterized in that, the heat exchange pipeline (1) is provided with a manual control valve (28) for controlling the on-off of the heat exchange pipeline (1). 8. The waste heat recovery system of the refrigeration device according to any one of claims 1-3, characterized in that, when the waste heat recovery system of the refrigeration device is in the third heat recovery mode, the auxiliary heat exchanger (17) is in the heat exchange pipeline ( 1) is downstream of the main heat exchanger (12). 9. Refrigeration device waste heat recovery device, including refrigeration device, refrigeration device includes main compressor (3), condenser (4), liquid receiver (5) and evaporator (6), main compressor (3), condenser (4), the liquid receiver (5) and the evaporator (6) are connected in series, and a main condensation pipeline (9) and a main heat recovery branch pipeline (11) are arranged between the main compressor (3) and the condenser (4). , the condensing main line (9) is connected in parallel with the main heat recovery branch (11), and the main heat recovery branch (11) is provided with a main heat exchanger (12); the condensing main line (9) is provided with a control condensation The main heat recovery branch (11) is provided with a heat recovery valve (13) for controlling the main heat recovery branch (11) on and off, or the main heat recovery branch (11) is A reversing valve is arranged downstream of the compressor (3), and the reversing valve is used to communicate with the main compressor (3) in one of the condensing main line (9) and the main heat recovery branch (11); it is characterized in that, The downstream of the main compressor (3) is connected with an auxiliary heat recovery branch (14), and the auxiliary heat recovery branch (14) is provided with an auxiliary compressor (16), an auxiliary heat exchanger (17) and a control auxiliary heat The branch valve (15) for turning on and off the recovery branch (14); the auxiliary heat recovery branch (14) is connected in parallel with the main heat recovery branch (11), and the downstream end of the auxiliary heat recovery branch (14) is connected The pipeline between the condenser (4) and the liquid receiver (5) or the downstream end of the auxiliary heat recovery branch (14) is connected to the liquid receiver (5); the waste heat recovery device of the refrigeration device has a single cooling mode, a first heat recovery mode, a second heat recovery mode and a third heat recovery mode; When the waste heat recovery device of the refrigeration device is in the single refrigeration mode, the main compressor (3) communicates with the condenser (4), and is disconnected from the main heat exchanger (12) and the auxiliary heat exchanger (17), and the main heat exchanger ( 12) Neither the auxiliary heat exchanger (17) works; When the waste heat recovery device of the refrigeration device is in the first heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12), and is disconnected from the condenser (4) and auxiliary heat exchanger (17), and the main heat exchange Device (12) work; When the waste heat recovery device of the refrigeration device is in the second heat recovery mode, the main compressor (3) communicates with the condenser (4) and communicates with the auxiliary heat exchanger (17), and is disconnected from the main heat exchanger (12). Heat exchanger (17) work; When the waste heat recovery device of the refrigeration device is in the third heat recovery mode, the main compressor (3) communicates with the main heat exchanger (12) and communicates with the auxiliary heat exchanger (17), and is disconnected from the condenser (4). Both heat exchanger (17) and main heat exchanger (12) work. 10. The waste heat recovery device of the refrigeration device according to claim 9, characterized in that, the auxiliary heat recovery branch (14) is provided with an auxiliary branch throttling mechanism (18) downstream of the auxiliary heat exchanger (17) ).

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