Refrigerating system provided with sleeve type heat regeneration structure and used for refrigerating equipment

Abstract

The utility model relates to the technical field of refrigeration of refrigeration equipment, in particular to a refrigeration system provided with a sleeve type heat regeneration structure and used for the refrigeration equipment, which comprises an outer condenser, a condensation fan, an inner condenser, an evaporator, a drying filter and a compressor, and further comprises the sleeve type heat regeneration structure which comprises an outer sleeve and an embedded pipe. The outer casing pipe comprises a casing pipe inlet, a casing pipe body and a casing pipe outlet, the casing pipe inlet is connected with the air outlet end of the evaporator, the casing pipe outlet is connected with the air inlet of the compressor, the inner embedded pipe comprises an embedded pipe inlet, an embedded pipe body and an embedded pipe outlet, the embedded pipe inlet is connected with the air outlet of the drying filter, and the embedded pipe outlet is connected with the air outlet of the drying filter. An embedded pipe outlet is connected with an air inlet of the evaporator, the embedded pipe body is embedded in the sleeve pipe body, and by means of the sleeve pipe type heat regeneration structure, heat regeneration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, and in particular to a refrigeration system provided with a sleeve-type heat recovery structure and used in refrigeration equipment. Background Art

[0002] Currently, most common commercial refrigerators in the market use steam compression for refrigeration. The refrigeration system used is composed of compressor, condenser, capillary tube, evaporator, return air pipe, dry filter, pipeline, condensing fan and other components. The state of the refrigerant at the inlet and outlet of the evaporator determines the cooling capacity and quality of the refrigeration cycle, which in turn affects the overall operating efficiency of the refrigeration equipment.

[0003] In the refrigeration system, the pressure of the refrigerant can be reduced to a certain range through the throttling effect of the capillary tube. However, a considerable part of the refrigerant after the pressure reduction will absorb heat and evaporate, thereby reducing the evaporation ratio of the refrigerant in the evaporator. In order to delay the phase change of the refrigerant in the capillary tube and reduce its dryness, the commonly used method in the industry is to attach the capillary tube to the outer wall of the return pipe by welding, thereby achieving the purpose of transferring the cold from the return pipe to the capillary tube. This method will not only increase the cooling capacity of the original system, but also reduce the possibility of liquid refrigerant in the return pipe flowing into the compressor to a certain extent.

[0004] However, in the above technology, since the capillary tube and the return air pipe are both circular pipes, the external contact between the two is line contact, and the heat exchange needs to pass through two layers of metal walls. The heat transfer coefficient and the heat transfer area are both small. Therefore, the heat exchange capacity between the capillary tube and the return air pipe is limited, and heat recovery is difficult to fully carry out.

[0005] Therefore, how to improve the heat exchange capacity between the capillary tube and the return air pipe without affecting the overall structure of the refrigeration system is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a heat exchange structure for a refrigeration system that can increase the heat exchange area between the capillary tube and the return air pipe, eliminate the influence of the metal wall of the return air pipe on the heat exchange, fully reduce the evaporation of the refrigerant in the capillary tube and further inhibit the occurrence of liquid hammer in the compressor.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a refrigeration system with a shell and tube heat recovery structure for refrigeration equipment, including an external condenser, a condensing fan, an internal condenser, an evaporator, a drying filter, and a compressor, and also including a shell and tube heat recovery structure, the shell and tube heat recovery structure includes an outer shell and an inner embedded tube, the outer shell includes a shell inlet, a shell body, and a shell outlet, the shell inlet is connected to the air outlet end of the evaporator, the shell outlet is connected to the air inlet of the compressor, the inner embedded tube includes an embedded tube inlet, an embedded tube body, and an embedded tube outlet, the embedded tube inlet is connected to the air outlet of the drying filter, the embedded tube outlet is connected to the air inlet of the evaporator, and the embedded tube body is embedded in the shell body.

[0008] The above-mentioned refrigeration system for refrigeration equipment is provided with a sleeve-type heat recovery structure, the embedded tube body is a coaxial spiral structure, the sleeve body is provided with a sleeve inlet and a sleeve outlet, the two ends of the embedded tube body are respectively connected to the sleeve inlet and the sleeve outlet, the embedded tube inlet is connected to the sleeve inlet, and the embedded tube outlet is connected to the sleeve outlet.

[0009] The above-mentioned refrigeration system for refrigeration equipment is provided with a sleeve-type heat recovery structure, the sleeve body is a straight cylinder, the sleeve inlet and the sleeve outlet have the same structure, including a trumpet body and a tube body, the wide mouth of the trumpet body is connected to the sleeve body, and the narrow mouth of the trumpet body is connected to the tube body.

[0010] In the above-mentioned refrigeration system provided with a sleeve-type heat recovery structure for refrigeration equipment, the spiral outer diameter of the embedded tube body is smaller than the inner diameter of the sleeve body.

[0011] In the above-mentioned refrigeration system provided with a sleeve-type heat recovery structure for refrigeration equipment, the sleeve inlet and the sleeve outlet are on the same side, and the sleeve outlet and the sleeve inlet are on the same side.

[0012] The above-mentioned refrigeration system for refrigeration equipment is provided with a shell-and-tube heat recovery structure, and the external condenser, condensing fan, internal condenser, evaporator, drying filter, compressor, and shell-and-tube heat recovery structure are connected by pipelines. After the refrigerant is compressed by the compressor, it passes through the external condenser, the internal condenser, the drying filter, the embedded tube, the evaporator, and the outer shell in sequence, and then enters the compressor again to circulate.

[0013] The utility model is a refrigeration system with a sleeve-type heat recovery structure for refrigeration equipment, which has the beneficial effect that: the technical solution of the utility model replaces the original heat recovery method of welding the capillary tube and the return air pipe by setting the sleeve-type heat recovery structure, so that the embedded tube is used as the inner tube, and the refrigerant in the outer tube flows through the interlayer between the embedded tube and the outer tube, thereby increasing the heat exchange area and reducing the heat exchange resistance, improving the heat exchange efficiency of the heat recovery process, reducing the phase change of the refrigerant in the capillary tube, and finally improving the operating efficiency of the system. By using the sleeve-type heat recovery structure to replace the original welding process of the capillary tube and the return air pipe, the problem of inconsistent product performance caused by the open welding at the connection between the capillary tube and the return air pipe caused by the installation or transportation process can be avoided, and the stability of the refrigeration system is enhanced; by using the sleeve-type heat recovery structure, the heat recovery efficiency is improved, the dryness of the refrigerant in the return air pipe can be fully improved, and the occurrence of liquid hammer in the compressor can be further suppressed, and the reliability of the refrigeration system can be effectively improved, and the service life of the product can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the refrigeration system of the utility model;

[0015] Figure 2 This is a schematic diagram of the process principle of the refrigeration system of the utility model;

[0016] Figure 3 This is a partial enlarged view of the shell-and-tube heat regenerator of the utility model;

[0017] Figure 4 This is the pressure-enthalpy diagram of the working process of the refrigeration cycle system of the utility model.

[0018] Explanation of the reference numerals: inner condenser 1, evaporator 2, temperature sensing tube sleeve 3, outer sleeve 4, sleeve inlet 411, sleeve outlet 412, sleeve body 413, outer condenser 5, compressor 6, inner embedded tube 7, embedded tube inlet 711, embedded tube body 712, embedded tube outlet 713, drying filter 8, condenser fan 9, inner tank body 10. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the utility model, the technical solution of the utility model is described below in conjunction with specific implementation methods and drawings. Obviously, the described embodiments are only 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 making creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figure 1As shown, it is the general assembly diagram of the refrigeration system of this embodiment, which shows the position and connection method of each component in this embodiment. In this embodiment, the main components of the refrigeration system are the inner condenser 1, the evaporator 2, the sleeve heat recovery structure, the outer condenser 5, the compressor 6, the filter drier 8, and the condenser fan 9. The evaporator is provided with a temperature sensing tube sleeve 3, wherein the sleeve heat recovery structure, the outer condenser, the compressor, the filter drier, and the external condenser fan are installed in the compressor room, the inner condenser is attached to the inner wall of the box shell, and the evaporator is attached to the outer wall of the inner tank body 10. The inner condenser, the evaporator, the sleeve heat recovery structure, the outer condenser, the compressor, and the filter drier are connected by pipes. The above components are all common refrigerator parts on the market, and their connection, installation method and installation position are all carried out in accordance with the conventions in the industry. The connection between each component is carried out by welding, and it can meet the pressure requirements of the refrigeration system. The condenser fan is installed in the air duct of the outer condenser, and forced convection heat exchange is performed on the outer condenser to improve the condensation efficiency.

[0022] The heat exchange between the capillary tube and the return pipe in the prior art can reduce the gasification of the refrigerant in the capillary tube to a certain extent, improve the refrigeration capacity of the system, and prevent the liquid refrigerant in the return pipe from flowing into the compressor and causing liquid hammer. The traditional solution is to attach the capillary tube to the outer wall of the return pipe by welding, but the heat exchange efficiency is too poor. This device is equipped with a sleeve-type heat recovery structure, replacing the original heat recovery method of welding the capillary tube and the return pipe, so that the capillary tube is used as an embedded tube and the return pipe is used as an outer sleeve. The refrigerant in the return pipe flows through the interlayer between the inner tube and the outer tube, thereby increasing the heat exchange area and reducing the heat exchange resistance, improving the heat exchange efficiency of the heat recovery process, and ultimately improving the operating efficiency of the system.

[0023] In addition to the above refrigeration components, Figure 1 The positions and connection methods of functional parts such as electrical components and structural parts not shown in the figure all adopt the methods commonly used in the industry.

[0024] Example 2

[0025] This embodiment mainly describes the composition of the sleeve-type heat recovery structure, and the same parts as those in Embodiment 1 are not described in detail. Figure 3 As shown, it is a partial enlarged view of the sleeve-type heat recovery structure in this embodiment. The sleeve-type heat recovery structure includes an outer sleeve 4 and an embedded tube 7. The embedded tube can be formed by spiraling part of the capillary tube in the original refrigeration structure.

[0026] The outer sleeve includes a sleeve inlet 411, a sleeve body 413, and a sleeve outlet 412. The sleeve inlet is connected to the air outlet end of the evaporator, and the sleeve outlet is connected to the air inlet of the compressor. The sleeve body is in a straight cylindrical shape, and is provided with a sleeve inlet and a sleeve outlet. The sleeve inlet and the sleeve outlet have the same structure, including a trumpet body and a tube body. The wide mouth of the trumpet body is connected to the sleeve body, and the narrow mouth of the trumpet body is connected to the tube body.

[0027] The embedded tube includes an embedded tube inlet 711, an embedded tube body 712, and an embedded tube outlet 713. The embedded tube inlet is connected to the air outlet of the filter drier, the embedded tube outlet is connected to the air inlet of the evaporator, and the embedded tube body is sleeved in the sleeve body. The embedded tube body is a coaxial spiral structure, and the two ends of the embedded tube body are respectively connected to the sleeve inlet and the sleeve outlet, the embedded tube inlet is connected to the sleeve inlet, and the embedded tube outlet is connected to the sleeve outlet.

[0028] The inner embedded tube should avoid direct contact with the inner wall of the outer tube, and a certain gap should be retained to reduce the heat exchange between the refrigerant in the capillary tube and the external environment. Therefore, the spiral outer diameter of the embedded tube body is smaller than the inner diameter of the sleeve body.

[0029] When assembling, the embedded pipe body is sleeved in the sleeve body, and the embedded pipe inlet and the sleeve embedded inlet, the embedded pipe outlet and the sleeve embedded outlet are aligned respectively, and welding is performed. Then the horn body and the pipe body are welded to both sides of the sleeve body in sequence. When assembling the pipe body with other pipelines, welding or screwing can be used. When assembling the embedded pipe inlet, the embedded pipe outlet and other pipelines, welding or screwing can also be used.

[0030] The outer sleeve and the inner tube are arranged in countercurrent as a whole to increase the logarithmic mean temperature difference of the refrigerant on both sides. Therefore, the sleeve inlet is on the same side as the sleeve outlet, and the sleeve outlet is on the same side as the sleeve inlet.

[0031] Specifically, the external condenser, condensing fan, internal condenser, evaporator, filter drier, compressor, and sleeve-type heat recovery structure are connected by pipelines, and the connection methods include but are not limited to welding, and the method used should meet the pressure resistance requirements of the refrigeration pipeline. After being compressed by the compressor, the refrigerant passes through the external condenser, internal condenser, filter drier, embedded tube, evaporator, and outer sleeve in sequence, and then enters the compressor again, thus circulating.

[0032] The refrigeration system using the shell-and-tube heat recovery structure recorded in the technical solution replaces the common heat recovery method of welding the capillary tube and the return air pipe, so that the capillary tube is used as the embedded tube of the shell-and-tube heat recovery structure. The refrigerant in the original return air pipe flows through the interlayer between the embedded tube and the outer shell, thereby increasing the heat exchange area and reducing the heat exchange resistance, thereby improving the heat recovery efficiency. The refrigeration system can not only further improve the operating efficiency of the system and inhibit the occurrence of liquid hammer in the compressor, but also avoid the problem of inconsistent product performance caused by open welding at the connection between the capillary tube and the return air pipe due to installation or transportation, because the original capillary tube and return air pipe welding process has been abolished.

[0033] Example 3

[0034] This embodiment mainly describes the working principle of the refrigeration system, and the differences from the above embodiments are not repeated here. Figure 2 As shown, the arrow direction in the figure indicates the refrigerant flow direction, including a compressor, an external condenser, an internal condenser, a filter drier, a capillary tube, an evaporator, and a sleeve-type heat recovery structure. The compressor is connected to the inlet of the external condenser, the outlet of the external condenser is connected to the inlet of the internal condenser, the outlet of the internal condenser is connected to the inlet of the filter drier, the outlet of the filter drier is connected to the embedded tube inlet of the embedded tube, the embedded tube outlet of the embedded tube is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the sleeve inlet of the outer sleeve of the sleeve-type heat recovery structure, and the sleeve outlet of the sleeve-type heat recovery structure is connected to the air inlet of the compressor.

[0035] Example 4

[0036] This embodiment is a pressure-enthalpy diagram of the working process of the refrigeration cycle system, and the same points as the above embodiment will not be repeated. Figure 4 As shown, the refrigerant is compressed by the compressor and converted into high-temperature and high-pressure refrigerant vapor (corresponding to Figure 4 The gaseous refrigerant enters the external condenser through the pipeline for cooling. The rotation of the condenser fan will increase the heat exchange efficiency between the refrigerant and the external environment, and part of the refrigerant will change into liquid state (corresponding to Figure 4 The gas-liquid mixed refrigerant then enters the inner condenser for further phase change and produces supercooling. At this time, the refrigerant is completely converted into a supercooled liquid (corresponding to point B in the middle). Figure 4 Then, the supercooled liquid refrigerant enters the filter drier. The molecular sieve filled in the filter drier will absorb the moisture in the refrigerant, and the built-in metal mesh will filter out the impurities in it to prevent the refrigerant from entering the embedded tube and causing ice blockage and dirt blockage. The filtered refrigerant liquid flows into the embedded tube. Since the diameter of the embedded tube is small, it can play a role in throttling and reducing the pressure of the refrigerant. The refrigerant will undergo a phase change in the embedded tube and have a certain dryness, turning into a low-temperature and low-pressure gas-liquid mixed state (corresponding to Figure 4At point D in the middle, the reduced-pressure refrigerant flows into the evaporator to continue evaporating and absorbing heat, and then absorbs the heat in the cabinet to achieve the purpose of cooling the cabinet.

[0037] Due to the throttling of the embedded tube, the refrigerant will undergo phase change and have a certain dryness, which greatly affects the refrigeration capacity of the unit refrigerant. The refrigerant passing through the evaporator still has a relatively low temperature. Therefore, it is necessary to set a heat recovery device at the evaporator outlet. The heat recovery device in this embodiment is a sleeve-type heat recovery structure. The refrigerant in the gas-liquid mixed state flowing out of the evaporator (corresponding to Figure 4 The refrigerant passes through the shell inlet of the shell-and-tube heat recovery structure and enters the outer shell of the shell-and-tube heat recovery structure, and exchanges heat with the embedded tube passing through (suppressing the phase change of the refrigerant in the throttling process of the embedded tube, thereby achieving the purpose of reducing the refrigerant dryness at the embedded tube outlet of the embedded tube). Finally, the superheated refrigerant (corresponding to Figure 4 The air flows out from the casing outlet of the casing heat recovery structure (point F) and enters the compressor through the compressor air inlet for the next cycle.

[0038] Compared with the traditional heat recovery method of welding the capillary tube to the return air pipe, the present invention has two most significant advantages. First, the structure of the line contact between the capillary tube and the return air pipe is changed, which greatly increases the heat exchange area; second, the heat conduction resistance between the inner wall and the outer wall of the return air pipe is reduced. The increase in heat exchange area and the reduction in thermal resistance can significantly improve the heat recovery efficiency, reduce the phase change of the refrigerant in the capillary tube, and ultimately improve the system operation efficiency.

[0039] The above embodiments are only for illustrating the structural concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. A refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment, comprising an external condenser, a condensing fan, an internal condenser, an evaporator, a drying filter, and a compressor, characterized in that: It also includes a sleeve-type heat recovery structure, which includes an outer sleeve and an embedded tube. The outer sleeve includes a sleeve inlet, a sleeve body, and a sleeve outlet. The sleeve inlet is connected to the air outlet end of the evaporator, and the sleeve outlet is connected to the air inlet of the compressor. The embedded tube includes an embedded tube inlet, an embedded tube body, and an embedded tube outlet. The embedded tube inlet is connected to the air outlet of the drying filter, and the embedded tube outlet is connected to the air inlet of the evaporator. The embedded tube body is embedded in the sleeve body.

2. The refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment according to claim 1, characterized in that: The embedded tube body is a coaxial spiral structure, and an embedded inlet and an embedded outlet are arranged on the sleeve body. The two ends of the embedded tube body are respectively connected to the embedded inlet and the embedded outlet, the embedded tube inlet is connected to the embedded inlet, and the embedded tube outlet is connected to the embedded outlet.

3. The refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment according to claim 2, characterized in that: The sleeve body is in a straight cylindrical shape, and the sleeve inlet and the sleeve outlet have the same structure, including a trumpet body and a tube body. The wide mouth of the trumpet body is connected to the sleeve body, and the narrow mouth of the trumpet body is connected to the tube body.

4. The refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment according to claim 3, characterized in that: The spiral outer diameter of the embedded tube body is smaller than the inner diameter of the sleeve body.

5. The refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment according to claim 4, characterized in that: The sleeve inlet is on the same side as the sleeve outlet, and the sleeve outlet is on the same side as the sleeve inlet.

6. The refrigeration system with a shell-and-tube heat recovery structure for refrigeration equipment according to claim 4, characterized in that: The external condenser, condensing fan, internal condenser, evaporator, filter drier, compressor, and shell-and-tube heat recovery structure are connected by pipelines. After being compressed by the compressor, the refrigerant passes through the external condenser, internal condenser, filter drier, embedded tube, evaporator, and outer shell in sequence, and then enters the compressor again, thus circulating.

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