CN118089305A - Multi-temperature zone refrigeration system and cold storage - Google Patents

Abstract

The present invention provides a multi-temperature zone refrigeration system and cold storage, the multi-temperature zone refrigeration system includes: a compression condensing unit and a cold capacity distribution unit; the compression condensing unit includes a compressor and a first heat exchange component, the air intake end of the compressor is connected to the outlet end of the cold capacity distribution unit, the air outlet end of the compressor is connected to the inlet end of the first heat exchange component, and the outlet end of the first heat exchange component is connected to the inlet end of the cold capacity distribution unit; the cold capacity distribution unit includes a plurality of heat exchange units, the plurality of heat exchange units are arranged in parallel, and the heat exchange unit includes a circulation pipeline and a second heat exchange component arranged on the circulation pipeline. In the multi-temperature zone refrigeration system of the present invention, the cold capacity distribution unit includes a plurality of heat exchange units, the cold capacity prepared by the compression condensing unit can flow into a plurality of heat exchange units at the same time, each heat exchange unit can be adjusted individually, and can flexibly adapt to the use requirements of multiple temperature zones.

Description

Multi-temperature zone refrigeration system and cold storage

Technical Field

The present invention relates to the field of refrigeration technology, and in particular to a multi-temperature zone refrigeration system and a cold storage.

Background technique

Cold storage is widely used in the pharmaceutical industry, food industry, poultry industry, fish farming industry, etc. The cold zone is usually equipped with multiple storage areas for storing multiple types of items. When the inventory temperature of the items varies greatly, the refrigeration temperature of each storage area is different.

The refrigeration system used in the cold storage in the prior art can only regulate the temperature in a single way. When the temperature requirements of multiple storage areas are different, each storage area needs to be equipped with a refrigeration unit, or a set of refrigeration units is used to circulate cooling to multiple storage areas in sequence. Each storage area is equipped with a refrigeration unit, which has a high investment cost. The refrigeration unit circulates cooling to multiple storage areas in sequence, and the temperature of the storage area fluctuates greatly, affecting the quality of the items stored in the cold storage.

Summary of the invention

The present invention provides a multi-temperature zone refrigeration system and a cold storage, which are used to solve the problem that the existing refrigeration system cannot adapt to the simultaneous regulation of multiple temperature zones in the cold storage.

In a first aspect, the present invention provides a multi-temperature zone refrigeration system, comprising: a compression condensing unit and a cooling capacity distribution unit;

The compression condensing unit comprises a compressor and a first heat exchange component, the air intake end of the compressor is connected to the outlet end of the cold distribution unit, the air outlet end of the compressor is connected to the inlet end of the first heat exchange component, and the outlet end of the first heat exchange component is connected to the inlet end of the cold distribution unit;

The cooling capacity distribution unit includes a plurality of heat exchange units, which are arranged in parallel. The heat exchange units include a circulation pipeline and a second heat exchange component arranged on the circulation pipeline.

According to a multi-temperature zone refrigeration system provided by the present invention, the second heat exchange component includes a first control valve, a first throttle valve, an evaporator and a second throttle valve;

The first control valve, the first throttle valve, the evaporator and the second throttle valve are arranged in sequence on the circulation pipeline; the first control valve is used to control the on-off of the circulation pipeline, the first throttle valve is used to adjust the refrigerant flow rate flowing into the evaporator, and the second throttle valve is used to adjust the pressure at the outlet of the evaporator.

According to a multi-temperature zone refrigeration system provided by the present invention, the multi-temperature zone refrigeration system further includes a first one-way valve and a second one-way valve;

The first one-way valve is arranged between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit, and the second one-way valve is arranged between the outlet end of the cold distribution unit and the suction end of the compressor.

According to a multi-temperature zone refrigeration system provided by the present invention, the multi-temperature zone refrigeration system further includes a cold storage unit;

The cold storage unit includes a flash evaporator, and the outlet end of the first heat exchange component is connected to the inlet of the flash evaporator through a reflux pipeline; the air supply port of the flash steam is connected to the suction end of the compressor through an air supply pipeline, and the air supply pipeline is provided with a second control valve for controlling the on-off of the air supply pipeline. The flash evaporator replenishes the gaseous refrigerant to the compressor through the air supply pipeline.

According to a multi-temperature zone refrigeration system provided by the present invention, the liquid replenishment port of the flash evaporator is connected to the inlet end of the cold distribution unit through a liquid replenishment pipeline, and the liquid replenishment pipeline is provided with a third control valve for controlling the on-off of the liquid replenishment pipeline. The flash evaporator replenishes cold energy to the cold distribution unit through the liquid replenishment pipeline.

According to a multi-temperature zone refrigeration system provided by the present invention, the first heat exchange component includes a first condenser, a second condenser and a regenerator;

The compressor has a first air intake port, a second air intake port, a first air outlet and a second air outlet, the first air intake port is connected to the outlet end of the cold capacity distribution unit, the first air outlet is connected to the inlet end of the first condenser, the outlet end of the first condenser is connected to the second air intake port, the second air outlet is connected to the inlet end of the second condenser, the outlet end of the second condenser is connected to the inlet end of the regenerator, and the outlet end of the regenerator is connected to the inlet end of the cold capacity distribution unit.

According to a multi-temperature zone refrigeration system provided by the present invention, the air supply pipeline includes a first air supply branch and a second air supply branch.

The first air supply branch is connected to the first air intake port, the second air supply branch is connected to the second air intake port, the first air supply branch is provided with a third throttle valve, and the second air supply branch is provided with a fourth throttle valve.

According to a multi-temperature zone refrigeration system provided by the present invention, a first cooling pipeline is provided at the outlet end of the regenerator, one end of the first cooling pipeline is connected to the hot end of the regenerator, and the other end is connected to the cold end of the regenerator, and a fifth throttle valve is provided on the first cooling pipeline;

The flash evaporator is connected to the cold end of the regenerator via a second cooling pipeline, the second cooling pipeline is provided with a sixth throttle valve, and the first cooling pipeline and the second cooling pipeline are used to provide cooling to the regenerator.

According to a multi-temperature zone refrigeration system provided by the present invention, the multi-temperature zone refrigeration system further includes a control unit, and the control unit is used to control the working parameters of each of the heat exchange units based on cooling requirements.

In a second aspect, the present invention provides a cold storage, including the multi-temperature zone refrigeration system, wherein a plurality of heat exchange units are arranged in a plurality of storage areas of the cold storage, and the heat exchange units perform refrigeration based on a target temperature of the storage area.

The multi-temperature zone refrigeration system and cold storage provided by the present invention, the compression condensing unit and the cold capacity distribution unit constitute a refrigerant circulation loop, the compression condensing unit includes a compressor and a first heat exchange component, which is used to convert the sucked low-pressure refrigerant into a low-temperature refrigerant; the cold capacity distribution unit includes multiple heat exchange units, the cold capacity prepared by the compression condensing unit can flow into multiple heat exchange units at the same time, each heat exchange unit can be adjusted individually, and can flexibly adapt to the use requirements of multiple temperature zones.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a multi-temperature zone refrigeration system provided by the present invention;

Figure numerals: 1: compression condensing unit; 11: compressor; 12: first condenser; 13: second condenser; 14: regenerator; 15: first one-way valve; 16: second one-way valve; 17: fifth throttle valve; 2: cold capacity distribution unit; 21: circulation pipeline; 22: second heat exchange component; 221: first control valve; 222: first throttle valve; 223: evaporator; 224: second throttle valve; 3: cold storage unit; 31: flash evaporator; 32: second control valve; 33: third control valve; 34: third throttle valve; 35: fourth throttle valve; 36: sixth throttle valve; 37: seventh throttle valve.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The multi-temperature zone refrigeration system according to an embodiment of the present invention will be described below with reference to FIG. 1 .

As shown in Figure 1, the multi-temperature zone refrigeration system provided by an embodiment of the present invention includes: a compression condensing unit 1 and a cold capacity distribution unit 2; the compression condensing unit 1 includes a compressor 11 and a first heat exchange component, the suction end of the compressor 11 is connected to the outlet end of the cold capacity distribution unit 2, the outlet end of the compressor 11 is connected to the inlet end of the first heat exchange component, and the outlet end of the first heat exchange component is connected to the inlet end of the cold capacity distribution unit 2; the cold capacity distribution unit 2 includes a plurality of heat exchange units, the plurality of heat exchange units are arranged in parallel, and the heat exchange unit includes a circulation pipeline 21 and a second heat exchange component 22 arranged on the circulation pipeline 21.

Specifically, the outlet end of the compression condensing unit 1 is connected to the inlet end of the cold distribution unit 2, and the outlet end of the cold distribution unit 2 is connected to the inlet end of the compression condensing unit 1, so that the compression condensing unit 1 and the cold distribution unit 2 constitute a circulation loop of the refrigerant, and the cold distribution unit 2 can cool multiple working areas.

The compression condensing unit 1 includes a compressor 11 and a first heat exchange component. The compressor 11 can be a single-stage compressor, a two-stage compressor or a multi-stage compressor. The compressor 11 is used to convert the low-pressure gaseous refrigerant discharged from the cold distribution unit 2 into a high-pressure gaseous refrigerant. The high-pressure gaseous refrigerant exchanges heat with the first heat exchange component and is converted into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows into the cold distribution unit 2. The refrigerant in the present invention is _CO2 refrigerant, and the first heat exchange component includes a condenser.

The cold distribution unit 2 includes a plurality of heat exchange units, which are arranged in parallel and are arranged in corresponding working areas according to the use requirements. For example, the cold distribution unit 2 is used to refrigerate a cold storage, which includes a plurality of storage areas, each of which has a corresponding target temperature according to the stored items. The plurality of heat exchange units are arranged in a one-to-one correspondence with the plurality of storage areas, and each heat exchange unit is used to refrigerate the storage area in which it is located.

The heat exchange unit includes a circulation pipeline 21 and a second heat exchange component 22 arranged on the circulation pipeline 21. The inlet of the circulation pipeline 21 is connected to the outlet end of the first heat exchange component, and the outlet of the circulation pipeline 21 is connected to the suction end of the compressor 11. The second heat exchange component 22 includes an evaporator, which absorbs heat to cool the storage area.

The number of heat exchange units is set according to actual needs. For example, if the number of heat exchange units is three, the three heat exchange units are defined as the first heat exchange unit, the second heat exchange unit and the third heat exchange unit respectively. The first heat exchange unit is located in the first storage area, the second heat exchange unit is located in the second storage area, and the third heat exchange unit is located in the third storage area. The three storage areas are cooled by the three heat exchange units. The temperature of the first storage area can be maintained at the first target temperature, the temperature of the second storage area can be maintained at the second target temperature, and the temperature of the third storage area can be maintained at the third target temperature by the three heat exchange units. Thus, the three storage areas can be maintained within the required target temperature range by the three heat exchange units. It can be understood that the first target temperature, the second target temperature and the third target temperature can be the same or different, which is determined according to the specific usage. By controlling the working parameters of the second heat exchange component 22, the working area where each heat exchange unit is located is maintained within the required target temperature range.

In an embodiment of the present invention, the compression and condensing unit 1 and the cold energy distribution unit 2 constitute a circulation loop of the refrigerant. The compression and condensing unit 1 includes a compressor 11 and a first heat exchange component, which is used to convert the sucked low-pressure refrigerant into a low-temperature refrigerant; the cold energy distribution unit 2 includes multiple heat exchange units. The cold energy prepared by the compression and condensing unit 1 can flow into multiple heat exchange units at the same time. Each heat exchange unit can be adjusted individually and can flexibly adapt to the use requirements of multiple temperature zones.

As shown in Figure 1, in an optional embodiment, the second heat exchange component 22 includes a first control valve 221, a first throttle valve 222, an evaporator 223 and a second throttle valve 224; the first control valve 221, the first throttle valve 222, the evaporator 223 and the second throttle valve 224 are sequentially arranged in the circulation pipeline 21; the first control valve 221 is used to control the on-off of the circulation pipeline 21, the first throttle valve 222 is used to adjust the refrigerant flow rate flowing into the evaporator 223, and the second throttle valve 224 is used to adjust the pressure at the outlet of the evaporator 223.

Specifically, the second heat exchange assembly 22 includes a first control valve 221, a first throttle valve 222, an evaporator 223, and a second throttle valve 224, which are sequentially arranged on the circulation pipeline 21. The first control valve 221 is used to control the connection and closing of the circulation pipeline 21, the first throttle valve 222 is used to adjust the refrigerant flow entering the evaporator 223, the evaporator 223 is used to absorb the heat in the working area, the second throttle valve 224 is used to adjust the pressure at the outlet of the evaporator 223, and the first throttle valve 222 and the second throttle valve 224 can both be electronic expansion valves. The working areas of the three heat exchange units are defined as a high temperature zone, a medium temperature zone, and a low temperature zone, respectively. The high temperature zone is used for preserving fresh items, the medium temperature zone is used for refrigerated items, and the low temperature zone is used for frozen items.

The low-temperature liquid refrigerant discharged from the first heat exchange component can flow to the first heat exchange unit, the second heat exchange unit and the third heat exchange unit at the same time. Taking the first heat exchange unit working in the high temperature zone as an example, the refrigerant flows to the first heat exchange unit, the first control valve 221 is opened, the circulation pipeline 21 is in a connected state, and the refrigerant flows through the first control valve 221 to reach the first throttle valve 222. The refrigerant flows into the evaporator 223 after flow regulation and pressure regulation of the first throttle valve 222. The evaporator 223 absorbs the heat in the working area to achieve the purpose of cooling the working area. The refrigerant after absorbing heat is discharged from the outlet of the evaporator 223, and the second throttle valve 224 regulates the pressure of the refrigerant discharged from the outlet of the evaporator 223.

The target temperature of each heat exchange unit is different, and the pressure of the refrigerant discharged from the outlet of the evaporator 223 is also different. The second throttle valve 224 is used to adjust the pressure of the refrigerant discharged from the outlet of the evaporator 223 on each circulation pipeline 21 to be consistent. For example, for three heat exchange units, the three second throttle valves 224 on the three circulation pipelines 21 adjust the pressure of the refrigerant discharged from the evaporator 223 to be consistent, so that the refrigerant discharged from the three evaporators 223 is collected and flows to the suction end of the compressor 11.

It can be understood that the second throttle valve 224 may not be provided for the third heat exchange unit working in the low temperature zone, and the second throttle valve 224 of the first heat exchange unit working in the high temperature zone and the second throttle valve 224 of the second heat exchange unit working in the medium temperature zone can adjust the pressure of the refrigerant discharged from the evaporator 223 to be consistent with the pressure of the refrigerant discharged from the evaporator 223 working in the low temperature zone.

When there are multiple heat exchange units, the second throttle valve 224 on each circulation pipeline 21 adjusts the pressure of the refrigerant discharged from the evaporator 223, so that the pressure of the refrigerant at the outlet end of each circulation pipeline 21 is consistent, and the refrigerants in multiple circulation pipelines 21 are aggregated and flow to the suction end of the compressor 11.

In an embodiment of the present invention, a first control valve 221, a first throttle valve 222, an evaporator 223 and a second throttle valve 224 are sequentially arranged on the circulation pipeline 21. The first control valve 221 controls the on-off of the circulation pipeline 21, the first throttle valve 222 adjusts the refrigerant flow entering the evaporator 223, and the second throttle valve 224 adjusts the pressure of the refrigerant discharged from the outlet of the evaporator 223 to ensure the stability of the operation of each heat exchange unit.

As shown in Figure 1, in an optional embodiment, the multi-temperature zone refrigeration system also includes a first one-way valve 15 and a second one-way valve 16; the first one-way valve 15 is arranged between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit 2, and the second one-way valve 16 is arranged between the outlet end of the cold distribution unit 2 and the suction end of the compressor 11.

Specifically, a first one-way valve 15 is provided on the first connecting pipeline between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit 2 to ensure that the refrigerant flowing out of the outlet end of the first heat exchange component flows to the cold distribution unit 2 to avoid the backflow of the refrigerant.

Furthermore, a drying filter is also provided on the first connecting pipeline, and the drying filter is located behind the first one-way valve 15. The refrigerant flowing out of the outlet end of the first heat exchange component is dried and filtered by the drying filter and then flows to the multiple heat exchange units. A flow meter is also provided on the first connecting pipeline for detecting the refrigerant flow to the multiple heat exchange units.

A second one-way valve 16 is provided on the second connecting pipeline between the outlet end of the cooling distribution unit 2 and the suction end of the compressor 11 to ensure that the refrigerant discharged from the multiple heat exchange units flows to the compressor 11 to avoid the backflow of the refrigerant.

Furthermore, an air intake filter is also provided on the second connecting pipeline, and the refrigerant discharged from multiple heat exchange units is collected and flows into the air intake filter. After being filtered, the refrigerant flows through the second one-way valve 16 and then flows into the air intake end of the compressor 11.

In an embodiment of the present invention, a first one-way valve 15 is provided between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit 2, and a second one-way valve 16 is provided between the outlet end of the cold distribution unit 2 and the suction end of the compressor 11, so as to ensure the smooth circulation of the refrigerant, thereby facilitating the reliable operation of the refrigeration system.

As shown in Figure 1, in an optional embodiment, the multi-temperature zone refrigeration system also includes a cold storage unit 3; the cold storage unit 3 includes a flash evaporator 31, and the outlet end of the first heat exchange component is connected to the inlet of the flash evaporator 31 through a reflux pipeline; the air supply port of the flash steam is connected to the suction end of the compressor 11 through the air supply pipeline, and the air supply pipeline is provided with a second control valve 32 for controlling the on-off of the air supply pipeline, and the flash evaporator 31 replenishes the gaseous refrigerant to the compressor 11 through the air supply pipeline.

Specifically, the cold storage unit 3 includes a flash evaporator 31, the outlet end of the first heat exchange component is connected to the inlet of the flash evaporator 31 through a return line, and the refrigerant discharged from the outlet end of the first heat exchange component is a refrigerant in a gas-liquid two-phase state. The refrigerant discharged from the outlet end of the first heat exchange component can flow into the flash evaporator 31 through the return line, and the flash evaporator 31 can store cold energy.

The flash evaporator 31 may be a flash tank, and a gas supply port is provided at the top of the flash evaporator 31. The gas supply port of the flash evaporator 31 is connected to the air intake end of the compressor 11 through an air supply pipeline, and the gaseous refrigerant can be supplemented to the compressor 11 through the air supply pipeline. A second control valve 32 is provided on the air supply pipeline, and the second control valve 32 controls the on-off of the air supply pipeline based on the pressure at the air outlet end of the compressor 11. When the pressure at the air intake end of the compressor 11 is lower than the preset pressure, the second control valve 32 is opened, and the gaseous refrigerant in the flash evaporator 31 flows to the air intake end of the compressor 11 through the air supply pipeline to increase the air intake pressure of the compressor 11. When the pressure at the air intake end of the compressor 11 is equal to or higher than the preset pressure, the second control valve 32 is closed.

In the embodiment of the present invention, the flash evaporator 31 is used to store cold energy. The air supply port of the flash evaporator 31 is connected to the suction end of the compressor 11 through an air supply pipeline. The flash evaporator 31 can replenish gaseous refrigerant to the compressor 11 to ensure the stable operation of the compressor 11.

As shown in Figure 1, in an optional embodiment, the refill port of the flash evaporator 31 is connected to the inlet end of the cold distribution unit 2 through a refill pipeline. The refill pipeline is provided with a third control valve 33 for controlling the on-off of the refill pipeline. The flash evaporator 31 replenishes cold energy to the cold distribution unit 2 through the refill pipeline.

Specifically, a liquid replenishing port is provided at the bottom of the flash evaporator 31, and the liquid replenishing port of the flash evaporator 31 is connected to the inlet end of the cold distribution unit 2 through a liquid replenishing pipeline, and liquid refrigerant can be replenished to the cold distribution unit 2 through the liquid replenishing pipeline. A third control valve 33 is provided on the liquid replenishing pipeline, and the third control valve 33 is adjusted based on the operating conditions of the cold distribution unit 2.

When the cooling demand of the area where the cooling distribution unit 2 works increases and the cooling capacity prepared by the compression condensing unit 1 is insufficient, the third control valve 33 is opened, and the liquid refrigerant in the flash evaporator 31 flows to the cooling distribution unit 2 through the liquid replenishment pipeline to supplement the cooling capacity required by the cooling distribution unit 2. When the cooling capacity prepared by the compression condensing unit 1 meets the cooling capacity required by the cooling distribution unit 2, the third control valve 33 is closed.

Furthermore, a flow meter is provided on the first connecting pipeline between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit 2. The cold capacity required by the cold distribution unit 2 decreases, the flow value detected by the flow meter is less than the set flow value, the compression condensing unit 1 is still in high-frequency operation, and the refrigerant discharged from the first heat exchange component can flow into the flash evaporator 31 through the return pipeline for storage. The cold capacity required by the cold distribution unit 2 increases, and the liquid refrigerant in the flash evaporator 31 flows to the cold distribution unit 2 through the liquid replenishment pipeline to supplement the cold capacity required by the cold distribution unit 2.

In the embodiment of the present invention, the cooling capacity required by the cooling distribution unit 2 is reduced, and part of the cooling capacity discharged by the first heat exchange component flows into the flash evaporator 31 through the return pipeline for storage; the cooling capacity required by the cooling distribution unit 2 is increased, and the liquid refrigerant in the flash evaporator 31 flows to the cooling distribution unit 2 through the liquid replenishment pipeline; the pressure at the suction end of the compressor 11 is relatively low, and the gaseous refrigerant in the flash evaporator 31 flows to the compressor 11 through the air replenishment pipeline. The flash evaporator 31 has the functions of storing cooling capacity, replenishing air to the compressor 11, and replenishing cooling capacity to the cooling distribution unit 2, which is beneficial to ensuring the stable and reliable operation of the refrigeration system.

As shown in Figure 1, in an optional embodiment, the first heat exchange component includes a first condenser 12, a second condenser 13 and a regenerator 14; the compressor 11 has a first air intake, a second air intake, a first air outlet and a second air outlet, the first air intake is connected to the outlet end of the cold distribution unit 2, the first air outlet is connected to the inlet end of the first condenser 12, the outlet end of the first condenser 12 is connected to the second air intake, the second air outlet is connected to the inlet end of the second condenser 13, the outlet end of the second condenser 13 is connected to the inlet end of the regenerator 14, and the outlet end of the regenerator 14 is connected to the inlet end of the cold distribution unit 2.

Specifically, the compressor 11 is a two-stage compressor, and the compressor 11 has two air intake ports and two air outlet ports. The two air intake ports are defined as a first air intake port and a second air intake port, and the two air outlet ports are defined as a first air outlet and a second air outlet.

The refrigerant discharged from the cold distribution unit 2 flows in from the first air intake port of the compressor 11, is converted into medium-temperature medium-pressure refrigerant after the first stage of pressurization and is discharged from the first air outlet, then flows into the first condenser 12 for cooling, flows in from the second air intake port of the compressor 11 again, is converted into high-temperature and high-pressure transcritical refrigerant after the second stage of heating and is discharged from the second air outlet, then flows into the second condenser 13 for cooling, and flows into the regenerator 14 for cooling again. The liquid refrigerant discharged from the outlet of the regenerator 14 flows to the cold distribution unit 2, and the cold is distributed according to the amount of cold required by the working area of each heat exchange unit. The regenerator 14 can overcool the high-pressure liquid refrigerant before throttling to reduce throttling losses.

In the embodiment of the present invention, the compressor 11 performs secondary pressurization on the refrigerant, and the pressurized refrigerant is cooled through the first condenser 12, the second condenser 13 and the regenerator 14, thereby pressurizing and cooling the refrigerant, which is beneficial to saving energy consumption.

As shown in Figure 1, in an optional embodiment, the air supply pipeline includes a first air supply branch and a second air supply branch, the first air supply branch is connected to the first air intake port, the second air supply branch is connected to the second air intake port, the first air supply branch is provided with a third throttle valve 34, and the second air supply branch is provided with a fourth throttle valve 35.

Specifically, the air supply pipeline includes a first air supply branch and a second air supply branch. Two branches are separated from the pipeline leading out from the air supply port of the flash evaporator 31, which are defined as the first air supply branch and the second air supply branch respectively.

One end of the first air supply branch is connected to the air supply port, and the other end is connected to the first air intake port of the compressor 11. One end of the second air supply branch is connected to the air supply port, and the other end is connected to the second air intake port of the compressor 11. A third throttle valve 34 is provided on the first air supply branch, and a fourth throttle valve 35 is provided on the second air supply branch. The third throttle valve 34 and the fourth throttle valve 35 can both be expansion valves. When the pressure at the suction end of the compressor 11 is too low, the second control valve 32 is opened, and at the same time, the third throttle valve 34 is opened, and the gaseous refrigerant flows to the first air intake port of the compressor 11, thereby increasing the primary suction pressure of the compressor 11.

The second air supply branch is provided with a fourth throttle valve 35, which is a normally open valve. When the second control valve 32 is opened, the gaseous refrigerant in the flash evaporator 31 can flow through the second control valve 32 and the fourth throttle valve 35 and then flow to the second air intake port of the compressor 11, thereby increasing the secondary air intake pressure of the compressor 11. Furthermore, the fourth throttle valve 35 is connected to the cold end of the regenerator 14 through the third air supply branch, and the gaseous refrigerant at the cold end of the regenerator 14 can flow through the fourth throttle valve 35 along the third air supply branch and the second air supply branch and then flow to the second air intake port of the compressor 11, so that the gaseous refrigerant can flow back to the compressor 11.

In an embodiment of the present invention, a third throttle valve 34 is provided on the first air supply branch, and a fourth throttle valve 35 is provided on the second air supply branch. The fourth throttle valve 35 is a normally open valve. The flash evaporator 31 supplies air to the compressor 11 through the first air supply branch and the second air supply branch. At the same time, the gaseous refrigerant in the regenerator 14 can flow back to the compressor 11 through the fourth throttle valve 35, thereby ensuring the reliable operation of the compression condensing unit 1.

As shown in Figure 1, in an optional embodiment, a first cooling supply pipeline is provided at the outlet end of the regenerator 14, one end of the first cooling supply pipeline is connected to the hot end of the regenerator 14, and the other end is connected to the cold end of the regenerator 14, and a fifth throttle valve 17 is provided on the first cooling supply pipeline; the flash evaporator 31 is connected to the cold end of the regenerator 14 through a second cooling supply pipeline, and the second cooling supply pipeline is provided with a sixth throttle valve 36, and the first cooling supply pipeline and the second cooling supply pipeline are used to provide cooling to the regenerator 14.

Specifically, the cold end of the regenerator 14 is provided with a first cooling pipeline, and the first cooling pipeline is provided with a fifth throttle valve 17, so that the refrigerant discharged from the cold end of the regenerator 14 can flow back into the regenerator 14 along the first cooling pipeline. After the refrigerant is depressurized by the fifth throttle valve 17, it flows into the cold source side of the regenerator 14 to cool the refrigerant on the high temperature side, and the gaseous refrigerant further flows through the fourth throttle valve 35 to return to the secondary suction end of the compressor 11.

The liquid replenishing port of the flash evaporator 31 is connected to the cold end of the regenerator 14 through the second cooling pipeline, and the second cooling pipeline is provided with a sixth throttle valve 36. The fifth throttle valve 17 and the sixth throttle valve 36 can both be electronic expansion valves. The fifth throttle valve 17 is adjusted according to the outlet temperature of the outlet end of the regenerator 14. When the fifth throttle valve 17 is fully opened, the outlet temperature is still higher than the set temperature. The sixth throttle valve 36 is opened, and the cold in the flash evaporator 31 flows into the cold source side of the regenerator 14 to cool the refrigerant on the high temperature side so that the temperature of the discharged refrigerant can reach the set temperature.

In an embodiment of the present invention, a first cooling supply pipeline is provided at the outlet end of the regenerator 14, the first cooling supply pipeline is provided with a fifth throttle valve 17, the flash evaporator 31 is connected to the cold end of the regenerator 14 through a second cooling supply pipeline, the second cooling supply pipeline is provided with a sixth throttle valve 36, the temperature of the refrigerant discharged from the outlet end of the regenerator 14 is higher than the set temperature, the refrigerant flows back to the cold end of the regenerator 14 along the first cooling supply pipeline to cool the refrigerant on the high-temperature side, or the flash evaporator 31 supplements the cooling capacity to the regenerator 14 through the second cooling supply pipeline to cool the refrigerant on the high-temperature side, so that the temperature of the refrigerant discharged from the regenerator 14 meets the working requirements of the cooling capacity distribution unit 2.

In an optional embodiment, the multi-temperature zone refrigeration system further includes a control unit, which is used to control the working parameters of each heat exchange unit based on cooling demand.

Specifically, the refrigeration system also includes a control unit, which can control the working parameters of each heat exchange unit. Taking the heat exchange unit working in the high temperature zone of the cold storage as an example, the second heat exchange component 22 includes a first control valve 221, a first throttle valve 222, an evaporator 223 and a second throttle valve 224. It can be understood that the working area has a temperature sensor for real-time detection of the temperature of the high temperature zone. When the real-time temperature of the high temperature zone is greater than the target temperature, the first control valve 221 is opened, the opening of the first throttle valve 222 is adjusted according to the pressure at the outlet of the evaporator 223 and the real-time temperature of the high temperature zone, and the second throttle valve 224 is adjusted according to the pressure at the outlet of the cold distribution unit 2.

Similarly, the heat exchange unit working in the medium temperature zone and the heat exchange unit working in the low temperature zone are adjusted in a similar manner to achieve the coordinated operation of the three heat exchange units. It can be understood that when there are multiple heat exchange units, multiple heat exchange units work in multiple storage areas of the cold storage, and multiple heat exchange units work in coordination to achieve temperature regulation of multiple temperature zones.

Furthermore, the control unit is also used to control the storage of cold capacity of the flash evaporator 31, the air supply of the compressor 11, and the operation of supplying cold capacity of the cold capacity distribution unit 2. The pressure at the suction end of the compressor 11 is relatively low, and the control unit controls the second control valve 32 to open, and the flash evaporator 31 supplies gaseous refrigerant to the first suction port and the second suction port of the compressor 11 through the first air supply branch and the second air supply branch.

The cooling demand of the cold storage decreases, the control unit controls the seventh throttle valve 37 to open, and the refrigerant discharged from the outlet end of the regenerator 14 flows into the flash evaporator 31 along the return pipeline, and the flash evaporator 31 stores the cooling capacity. The cooling demand of the cold storage increases, and the cooling capacity prepared by the compression condensing unit 1 is insufficient. The control unit controls the third control valve 33 to open, and the flash evaporator 31 supplements the cooling capacity to multiple heat exchange units through the liquid replenishment pipeline.

The temperature of the refrigerant discharged from the outlet of the reheater 14 is higher than the set temperature, and the control unit controls the fifth throttle valve 17 to open, and the refrigerant flows into the cold source side of the reheater 14 along the first cooling pipeline to cool the refrigerant on the high-temperature side. When the temperature of the discharged refrigerant is still higher than the set temperature, the control unit controls the sixth throttle valve 36 to open, and the refrigerant discharged from the outlet of the reheater 14 flows into the cold source side of the reheater 14 along the first cooling pipeline. At the same time, the liquid refrigerant in the flash evaporator 31 flows into the cold source side of the reheater 14 through the second cooling pipeline to cool the refrigerant on the high-temperature side until the temperature of the refrigerant discharged from the outlet of the reheater 14 reaches the set temperature.

In the embodiment of the present invention, by controlling the working parameters of multiple heat exchange units through the control unit, temperature regulation of multiple temperature zones can be achieved to meet the use requirements of multiple temperature zones while ensuring the reliable operation of the refrigeration system.

An embodiment of the present invention further provides a cold storage, which includes the above-mentioned multi-temperature zone refrigeration system, multiple heat exchange units are arranged in multiple storage areas of the cold storage, and the heat exchange units perform refrigeration based on the target temperature of the storage area.

Specifically, multiple heat exchange units are arranged in multiple storage areas of the cold storage. According to the types of goods stored in each storage area, the control unit adjusts the working parameters of each heat exchange unit. The multiple heat exchange units work together to control the refrigerant flow and evaporation pressure of the evaporator 223 and other parameters to achieve the multiple storage areas to maintain the corresponding target temperature. The temperature of each storage area can be adjusted within the range of -40 to 10 degrees Celsius, and the refrigeration needs of multiple storage areas can be met simultaneously through a compression condensing unit 1.

The control unit coordinates and adjusts based on parameters such as the operating frequency of the compressor 11, the exhaust pressure of the compressor 11, the refrigerant flow direction, and the target temperature of each storage area. When the required cooling capacity of the cold storage is reduced, the cooling capacity can be stored through the flash evaporator 31; when the compression condensing unit 1 is insufficient, the flash evaporator 31 can supplement the cooling capacity to multiple heat exchange units, and when the pressure at the suction end of the compressor 11 is too low, the flash evaporator 31 can supplement the gaseous refrigerant to the compressor 11, so that the cold storage can store cooling capacity when the cooling capacity is small, and supplement cooling capacity when the cooling capacity is insufficient, thereby ensuring the stability of the temperature of multiple storage areas. At the same time, the compressor 11 can be replenished with air to ensure the reliable operation of the compressor 11. This multi-temperature zone refrigeration system operates stably and reliably, which is conducive to ensuring the stability of the temperature of multiple storage areas in the cold storage.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A multi-temperature zone refrigeration system, characterized in that it comprises: a compression condensing unit and a cooling capacity distribution unit; The compression condensing unit comprises a compressor and a first heat exchange component, the air intake end of the compressor is connected to the outlet end of the cold distribution unit, the air outlet end of the compressor is connected to the inlet end of the first heat exchange component, and the outlet end of the first heat exchange component is connected to the inlet end of the cold distribution unit; The cooling capacity distribution unit includes a plurality of heat exchange units, which are arranged in parallel. The heat exchange units include a circulation pipeline and a second heat exchange component arranged on the circulation pipeline. 2. The multi-temperature zone refrigeration system according to claim 1, characterized in that the second heat exchange component comprises a first control valve, a first throttle valve, an evaporator and a second throttle valve; The first control valve, the first throttle valve, the evaporator and the second throttle valve are arranged in sequence on the circulation pipeline; the first control valve is used to control the on-off of the circulation pipeline, the first throttle valve is used to adjust the refrigerant flow rate flowing into the evaporator, and the second throttle valve is used to adjust the pressure at the outlet of the evaporator. 3. The multi-temperature zone refrigeration system according to claim 1, characterized in that the multi-temperature zone refrigeration system further comprises a first one-way valve and a second one-way valve; The first one-way valve is arranged between the outlet end of the first heat exchange component and the inlet end of the cold distribution unit, and the second one-way valve is arranged between the outlet end of the cold distribution unit and the suction end of the compressor. 4. The multi-temperature zone refrigeration system according to claim 1, characterized in that the multi-temperature zone refrigeration system further comprises a cold storage unit; The cold storage unit includes a flash evaporator, and the outlet end of the first heat exchange component is connected to the inlet of the flash evaporator through a reflux pipeline; the air supply port of the flash steam is connected to the suction end of the compressor through an air supply pipeline, and the air supply pipeline is provided with a second control valve for controlling the on-off of the air supply pipeline. The flash evaporator replenishes the gaseous refrigerant to the compressor through the air supply pipeline. 5. The multi-temperature zone refrigeration system according to claim 4 is characterized in that the liquid replenishment port of the flash evaporator is connected to the inlet end of the cold distribution unit through a liquid replenishment pipeline, and the liquid replenishment pipeline is provided with a third control valve for controlling the on-off of the liquid replenishment pipeline, and the flash evaporator replenishes cold energy to the cold distribution unit through the liquid replenishment pipeline. 6. The multi-temperature zone refrigeration system according to claim 4, characterized in that the first heat exchange component comprises a first condenser, a second condenser and a regenerator; The compressor has a first air intake port, a second air intake port, a first air outlet and a second air outlet, the first air intake port is connected to the outlet end of the cold capacity distribution unit, the first air outlet is connected to the inlet end of the first condenser, the outlet end of the first condenser is connected to the second air intake port, the second air outlet is connected to the inlet end of the second condenser, the outlet end of the second condenser is connected to the inlet end of the regenerator, and the outlet end of the regenerator is connected to the inlet end of the cold capacity distribution unit. 7. The multi-temperature zone refrigeration system according to claim 6, characterized in that the air supply pipeline comprises a first air supply branch and a second air supply branch, The first air supply branch is connected to the first air intake port, the second air supply branch is connected to the second air intake port, the first air supply branch is provided with a third throttle valve, and the second air supply branch is provided with a fourth throttle valve. 8. The multi-temperature zone refrigeration system according to claim 6, characterized in that a first cooling pipeline is provided at the outlet end of the regenerator, one end of the first cooling pipeline is connected to the hot end of the regenerator, and the other end is connected to the cold end of the regenerator, and a fifth throttle valve is provided on the first cooling pipeline; The flash evaporator is connected to the cold end of the regenerator via a second cooling pipeline, the second cooling pipeline is provided with a sixth throttle valve, and the first cooling pipeline and the second cooling pipeline are used to provide cooling to the regenerator. 9. The multi-temperature zone refrigeration system according to any one of claims 1 to 8, characterized in that the multi-temperature zone refrigeration system further comprises a control unit, and the control unit is used to control the working parameters of each of the heat exchange units based on cooling requirements. 10. A cold storage, characterized in that it comprises the multi-temperature zone refrigeration system according to any one of claims 1 to 9, wherein a plurality of heat exchange units are arranged in a plurality of storage areas of the cold storage, and the heat exchange units perform refrigeration based on the target temperature of the storage area.