A carbon dioxide transcritical refrigeration structure for an ice maker

Abstract

The utility model relates to carbon dioxide transcritical refrigeration technical field discloses a carbon dioxide transcritical refrigeration structure for ice maker on, realized energy in the operation process effectively utilization, improved the overall energy efficiency of equipment, and reduced the cost, it includes compressor, and the compressor is connected with oil separator through pipeline, and the oil separator is connected with gas cooler through pipeline, and the gas cooler is connected with full liquid heat regenerator and oil return sleeve pipe through pipeline, and full liquid heat regenerator and oil return sleeve pipe are connected through pipeline, and full liquid heat regenerator and oil return sleeve pipe still connect with compressor through pipeline, wherein, full liquid heat regenerator and oil return sleeve pipe are connected with ice maker liquid supply end through pipeline, and install electronic expansion valve on this pipeline, and full liquid heat regenerator still connects with ice maker gas return end through pipeline, and install solenoid valve on the connecting pipeline between oil return sleeve pipe and compressor.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide transcritical refrigeration technology, and more specifically, to a carbon dioxide transcritical refrigeration structure for use in ice makers. Background Technology

[0002] In terms of liquid supply methods for industrial ice makers, there are mainly two types: direct expansion liquid supply and full-fledged liquid supply. Direct expansion liquid supply systems suffer from low evaporator heat exchange efficiency. To achieve the desired cooling effect, a larger evaporator with a larger heat exchange area is required, which undoubtedly increases equipment costs. Furthermore, this liquid supply method also leads to uneven ice thickness, severely affecting the consistency of ice quality. To improve evaporator efficiency, full-fledged liquid supply methods are widely used, but this method faces the technical bottleneck of difficult oil return.

[0003] Currently, a branch line is typically installed below the gas-liquid separator, along with solenoid valves and electronic expansion valves. This introduces the liquid refrigerant from the gas-liquid separator into a regenerator, where it exchanges heat with the high-temperature refrigerant at the gas cooler outlet, vaporizes, and then returns to the compressor. However, this solution increases system complexity and equipment cost. Furthermore, traditional transcritical carbon dioxide refrigeration structures require components such as high-pressure control valves, flash valves, and liquid receivers to maintain stable system operation. During the transition from high to low pressure, energy is lost due to throttling, resulting in inefficient energy utilization, energy waste, and reduced overall energy efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to propose a transcritical carbon dioxide refrigeration structure for ice makers.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A transcritical carbon dioxide refrigeration structure for an ice maker includes a compressor, an oil separator connected to the compressor via a pipeline, and a gas cooler connected to the oil separator via a pipeline. The gas cooler is connected to a flooded liquid regenerator and an oil return sleeve via a pipeline, and the flooded liquid regenerator and the oil return sleeve are connected by a pipeline, and the flooded liquid regenerator and the oil return sleeve are also connected to the compressor via a pipeline. The flooded liquid regenerator and the oil return sleeve are connected to the liquid supply end of the ice maker via a pipeline, and an electronic expansion valve is installed on this pipeline. The flooded liquid regenerator is also connected to the gas return end of the ice maker via a pipeline. A solenoid valve is installed on the connecting pipeline between the oil return sleeve and the compressor.

[0007] Furthermore, the above scheme further includes a full-liquid regenerator that subcools the high-temperature gaseous refrigerant from the gas cooler to the evaporation temperature, allowing the refrigerant to enter the ice maker with a lower dryness.

[0008] Furthermore, the above scheme further includes a full-liquid regenerator that separates the gaseous and liquid refrigerants of the homemade ice machine. The gaseous refrigerant returns to the compressor suction end through the gaseous refrigerant outlet, while the liquid refrigerant falls to the bottom of the full-liquid regenerator.

[0009] Furthermore, in the above scheme, when the solenoid valve is opened, the liquid refrigerant in the full-liquid regenerator exchanges heat with the high-temperature refrigerant from the outlet of the gas cooler and then returns to the suction end of the compressor.

[0010] Furthermore, in the above scheme, when the solenoid valve is opened, the refrigerant in the oil return sleeve carries the lubricating oil accumulated in the full liquid regenerator back to the compressor at a high flow rate.

[0011] Furthermore, the oil separator is connected to the compressor via a return oil line, so that the lubricating oil after passing through the oil separator flows back to the compressor via the return oil line.

[0012] Furthermore, the above solution includes a high pressure difference across the electronic expansion valve, which enables the refrigerant to be delivered over a longer distance.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model reduces equipment costs and improves overall energy efficiency by coordinating the compressor, oil separator, gas cooler, full liquid regenerator, oil return sleeve, electronic expansion valve and solenoid valve.

[0015] 2. In this utility model, the refrigerant at the outlet of the gas cooler is cooled again in the full liquid regenerator. Compared with the conventional transcritical carbon dioxide refrigeration structure, it eliminates a high-pressure throttling valve, a flash bypass valve and a liquid receiver, thus saving costs.

[0016] 3. In this utility model, there is a high pressure difference before and after the electronic expansion valve, which can deliver the refrigerant over a longer distance. When in use, the refrigeration unit can be placed outdoors and the ice maker can be placed indoors.

[0017] 4. In this utility model, the full-liquid regenerator combines the traditional regenerator and gas-liquid separator into one, saving costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Reference numerals: 1. Compressor; 2. Oil separator; 3. Gas cooler; 4. Flooded regenerator; 5. Oil return sleeve; 6. Electronic expansion valve; 7. Solenoid valve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0021] A transcritical carbon dioxide refrigeration structure for use in ice makers, see attached diagram. Figure 1 As shown, it includes a compressor 1, which is connected to an oil separator 2 via a pipeline. The oil separator 2 is connected to a gas cooler 3 via a pipeline, so that the exhaust gas from the compressor 1 enters the oil separator 2. After being processed by the oil separator 2, the oil is returned to the compressor 1, while the gaseous refrigerant enters the gas cooler 3.

[0022] The gas cooler 3 is connected to the full liquid regenerator 4 and the oil return sleeve 5 via pipelines, so that part of the cooled gaseous refrigerant enters the full liquid regenerator 4 and part enters the oil return sleeve 5. The full liquid regenerator 4 and the oil return sleeve 5 are connected by pipelines, and the full liquid regenerator 4 and the oil return sleeve 5 are also connected to the compressor 1 via pipelines. The full liquid regenerator 4 and the oil return sleeve 5 are connected to the liquid supply end of the ice maker via pipelines, and an electronic expansion valve 6 is installed on the pipelines, so that the refrigerant entering the full liquid regenerator 4 and the oil return sleeve 5 exchanges heat in the full liquid regenerator 4 and the oil return sleeve 5 respectively, and then enters the ice maker through the electronic expansion valve 6.

[0023] The flooded refrigerant 4 is also connected to the return gas end of the ice maker through a pipeline, so that after the refrigerant exchanges heat in the ice maker, the gas and liquid refrigerant returns to the flooded refrigerant 4. The gaseous refrigerant and liquid refrigerant are separated by the flooded refrigerant 4. The gaseous refrigerant returns to the suction end of the compressor 1, and the liquid refrigerant falls to the bottom of the flooded refrigerant 4. In addition, a solenoid valve 7 is installed on the connecting pipe between the oil return sleeve 5 and the compressor 1. When the solenoid valve 7 is opened, the liquid refrigerant in the flooded refrigerant 4 exchanges heat with the high-temperature refrigerant from the outlet of the gas cooler 3 and then returns to the suction end of the compressor 1.

[0024] In the specific implementation of this utility model, the compressor 1 compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous state and enters the oil separator 2. In the oil separator 2, the gaseous gas is separated from the lubricating oil. The separated lubricating oil returns to the compressor 1 through the oil return pipeline to ensure the lubrication requirements of the compressor 1, while the separated gaseous gas enters the gas cooler 3.

[0025] In the gas cooler 3, the high-temperature and high-pressure gaseous refrigerant is cooled. Part of the cooled gaseous refrigerant enters the flooded liquid regenerator 4, and the other part enters the oil return sleeve 5. The gaseous refrigerant entering the flooded liquid regenerator 4 exchanges heat with the liquid refrigerant from the bottom of the flooded liquid regenerator 4, and is subcooled to near the evaporation temperature. The gaseous refrigerant entering the oil return sleeve 5 uses its high flow velocity to prepare for subsequent oil return. After the refrigerant has exchanged heat with the flooded liquid regenerator 4 and the oil return sleeve 5, it is combined and throttled and depressurized through the electronic expansion valve 6, and then enters the ice maker.

[0026] In the ice maker, the refrigerant absorbs heat during the ice-making process and undergoes a phase change, gradually vaporizing from a liquid state into a two-phase state of gas and liquid. After the two-phase refrigerant flows out of the ice maker, it returns to the flooded refrigerant 4. Inside the flooded refrigerant 4, due to gravity and the internal structure, the gaseous refrigerant and the liquid refrigerant are separated. The gaseous refrigerant returns to the suction end of the compressor 1 through the gaseous refrigerant outlet on the flooded refrigerant 4, while the liquid refrigerant falls to the bottom of the flooded refrigerant 4 and accumulates.

[0027] Once the system is running stably, open solenoid valve 7. At this time, the liquid refrigerant accumulated at the bottom of the flooded refrigerant 4 exchanges heat with the high-temperature refrigerant from the outlet of the gas cooler 3 in the flooded refrigerant 4. The liquid refrigerant absorbs heat and evaporates, becoming gaseous refrigerant, which also returns to the suction end of compressor 1. At the same time, solenoid valve 7 opens, and the high flow rate of the refrigerant in the oil return sleeve 5 carries the lubricating oil accumulated in the flooded refrigerant 4 back to compressor 1, ensuring the long-term stable operation of compressor 1.

[0028] The foregoing has shown and described the main features and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A transcritical carbon dioxide refrigeration structure for an ice maker, comprising a compressor (1), wherein the compressor (1) is connected to an oil separator (2) via a pipeline, and the oil separator (2) is connected to a gas cooler (3) via a pipeline, characterized in that: The gas cooler (3) is connected to the full liquid regenerator (4) and the oil return sleeve (5) through a pipeline. The full liquid regenerator (4) and the oil return sleeve (5) are connected through a pipeline, and the full liquid regenerator (4) and the oil return sleeve (5) are also connected to the compressor (1) through a pipeline. Among them, the full liquid regenerator (4) and the oil return sleeve (5) are connected to the liquid supply end of the ice maker through the pipeline, and an electronic expansion valve (6) is installed on the pipeline. The full liquid regenerator (4) is also connected to the gas return end of the ice maker through the pipeline. Furthermore, a solenoid valve (7) is installed on the connecting pipe between the oil return sleeve (5) and the compressor (1).

2. The transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: The full-liquid regenerator (4) subcools the high-temperature gaseous refrigerant from the gas cooler (3) to the evaporation temperature, so that the refrigerant enters the ice maker with a lower dryness.

3. The transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: The full liquid regenerator (4) separates the gaseous refrigerant and liquid refrigerant of the homemade ice machine. The gaseous refrigerant returns to the suction end of the compressor (1) through the gaseous refrigerant outlet, and the liquid refrigerant falls to the bottom of the full liquid regenerator (4).

4. A transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: When the solenoid valve (7) is opened, the liquid refrigerant in the full liquid regenerator (4) exchanges heat with the high-temperature refrigerant from the outlet of the gas cooler (3) and returns to the suction end of the compressor (1).

5. A transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: When the solenoid valve (7) is opened, the refrigerant in the oil return sleeve (5) carries the lubricating oil accumulated in the full liquid regenerator (4) back to the compressor (1) at a high flow rate.

6. A transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: The oil separator (2) is also connected to the compressor (1) through a return oil line so that the lubricating oil after passing through the oil separator (2) flows back to the compressor (1) through the return oil line.

7. A transcritical carbon dioxide refrigeration structure for an ice maker according to claim 1, characterized in that: There is a high pressure difference before and after the electronic expansion valve (6).

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