Pre-cooler evaporator with high sealing performance

Abstract

The pre-cooling machine evaporator comprises an evaporator body, the evaporator body is composed of a shell, shell covers and a heat exchange assembly, the whole shell is designed to be circular, the two ends of the shell are sealed through the shell covers respectively, an upper partition plate and a lower partition plate are arranged in the shell, and the upper partition plate and the lower partition plate are arranged in the shell. A plurality of heat exchange assemblies are placed between the upper partition plate and the lower partition plate, cooling liquid flows through the heat exchange assemblies, and a liquid inlet and a liquid outlet are further formed in the side bodies of the two sides of the shell. The evaporator is mainly further improved on the basis of an original evaporator, the heat exchange efficiency is improved, the welding amount is reduced, the maintenance safety is improved, and the purposes of saving energy, improving efficiency and reducing the size and the weight of the evaporator can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of precoolers and relates to a precooler evaporator with high sealing performance. Background Art

[0002] The pre-cooling unit used in the current mainstream raw argon gas recovery technology is to cool the compressed gas to remove water and reduce the temperature of the compressed gas to provide users with dry low-temperature gas.

[0003] The precooling unit consists of the following main components: screw or scroll refrigerant compressor; control system; heat exchange part evaporator and condenser. However, the existing precooling system either uses a 100% flow refrigerant compressor or two 50% flow fixed frequency refrigerant compressors, and the maximum adjustable range can only be between 50% and 100%. When the ambient temperature is low and the humidity is low or the load is reduced, the heat load of the precooler is low. If the cooling capacity is not reduced accordingly, on the one hand, the suction volume ratio of the refrigerant compressor will increase, the suction mass of the compressor will decrease, that is, the total circulation volume of the refrigerant will decrease; on the other hand, the temperature of the precooled medium will be low, and the condensed water temperature may even condense and block the flow channel, resulting in unbalanced heat exchange.

[0004] The existing evaporator has the following problems: first, welding is inconvenient, and the welding space is narrow, so welding defects are easy to occur and difficult to detect; Second, there is a possibility of airflow short circuit between the air inlet and outlet sides in each return, which affects the heat exchange efficiency; Third, the core must be pulled out every time maintenance is performed, which causes the weld to bear additional tensile stress. In addition, there is inert gas at the end of the pipe, and maintenance personnel are at risk of suffocation, so safety precautions must be taken.

[0005] Therefore, a precooler evaporator with high sealing performance is designed to overcome the above problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a pre-cooling machine evaporator which is simple and reasonable in structure, practical and convenient, easy to maintain, safe and efficient, and highly sealed.

[0007] The present invention is achieved through the following technical scheme: a highly sealed precooler evaporator, which includes an evaporator body, which is composed of a shell, a shell cover, and a heat exchange component, wherein the shell is designed as a whole in a circular shape, and is sealed at both ends of the shell by the shell cover, and an upper partition and a lower partition are respectively arranged in the shell, and multiple sets of heat exchange components are placed between the upper partition and the lower partition, and coolant flows through the heat exchange component, and liquid inlets and outlets are also opened on the side bodies on both sides of the shell.

[0008] Preferably, the heat exchange assembly is composed of multiple heat exchange tubes, multiple fins, and a shell cover, each fin is provided with two groups of through holes, an upper and a lower group of through holes, a certain distance is left between the two groups of through holes, the upper through holes are liquid inlet group through holes, the lower through holes are liquid outlet group through holes, heat exchange tubes are installed on the liquid inlet group through holes and the liquid outlet group through holes, the ends of the two groups of heat exchange tubes are connected with a shell cover, a protruding return door is provided on the shell cover at the end of the two groups of heat exchange tubes, the return door is provided with a protruding return cover, so that the upper coolant can flow into the heat exchange tube below through the return cover, and a cooling liquid inlet flange and a cooling liquid outlet flange are provided on the return cover on one side, and a plurality of baffles are placed between the multiple fins.

[0009] Preferably, one side of the baffle is in close contact with the inner wall of the shell, and the other side is parallel to the edge of the fin, and the front and rear baffles are arranged oppositely so that the liquid changes its flow direction and fully reacts with each heat exchange unit. A baffle rubber strip is also arranged on one edge of the baffle located on the inner wall of the shell.

[0010] Preferably, a partition strip is installed on one side of the upper partition and the lower partition near the edge of the shell, one side of the partition strip is wrapped around the partition, and the other side is provided with an edging strip that is spread out in an eight-shaped shape. The partition strip makes the space inside the upper partition and the lower partition form an enclosed space.

[0011] Preferably, a support frame is arranged at the bottom of the shell.

[0012] The beneficial effects of the present invention are as follows: The compressors configured in the precooler of the present invention are two 50% screw or scroll refrigerant compressors, one of which is a variable frequency compressor. When the ambient temperature is low and the humidity is low, the variable frequency compressor is mainly operated; when the ambient temperature is high and the humidity is high, the fixed frequency compressor is mainly operated, and the variable frequency compressor plays an auxiliary role.

[0013] The high-sealing precooler evaporator designed in the present invention is mainly a further improvement on the original evaporator, which improves heat exchange efficiency, reduces welding volume, and improves the safety of maintenance. It can achieve the purpose of energy saving and efficiency improvement while reducing the volume and weight of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of the separator rubber strip in the present invention. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the present invention, it is necessary to understand that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inside", "outside", "horizontal" and "vertical" is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or original referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] The present invention will be described in detail below with reference to the accompanying drawings: Figure 1 As shown, a highly sealed precooler evaporator comprises an evaporator body 1, wherein the evaporator body 1 is composed of a shell 2, a shell cover 3, and a heat exchange component 8, wherein the shell 2 is designed as a whole in a circular shape, and is sealed at both ends of the shell 2 by the shell cover 3, and an upper partition 4 and a lower partition 5 are respectively arranged in the shell 2, and a plurality of heat exchange components 8 are placed between the upper partition 4 and the lower partition 5, and a coolant flows through the heat exchange component 8, and a liquid inlet 21 and a liquid outlet 22 are also opened on the side of the shell 2 on both sides.

[0020] like Figure 2 As shown, the heat exchange assembly is composed of a plurality of heat exchange tubes 6, a plurality of fins 7, and a shell cover 3. Each fin 7 is provided with two groups of through holes, one above the other, with a certain distance 11 between the two groups of through holes. The upper through holes are liquid inlet group through holes 9, and the lower through holes are liquid outlet group through holes 10. Heat exchange tubes 6 are installed on the liquid inlet group through holes 9 and the liquid outlet group through holes 10. The ends of the two groups of heat exchange tubes 6 are connected to the shell cover 3. A protruding return gate 13 is provided on the shell cover 3 at the ends of the two groups of heat exchange tubes 6. A protruding return cover 14 is provided on the return gate 13, so that the upper coolant can flow into the lower heat exchange tube 6 through the return cover 14, and a coolant inlet flange 15 and a coolant outlet flange 16 are provided on the return cover 14 on one side. A plurality of baffles 17 are also placed between the plurality of fins 7. One side of the baffle 17 is in close contact with the inner wall of the shell 2, and the other side is parallel to the edge of the fin 7, and the front and rear baffles 17 are arranged oppositely to change the flow direction of the liquid and fully react with each heat exchange unit. A baffle rubber strip 18 is also arranged on one edge of the baffle 17 located on the inner wall of the shell 2.

[0021] like Figure 3 As shown, a partition rubber strip 19 is installed on one side of the upper partition 4 and the lower partition 5 near the edge of the shell 2. One side of the partition rubber strip 19 is wrapped around the partition, and the other side is provided with an edge strip 20 that is spread out in an eight-shaped shape. The partition rubber strip 19 forms a closed space in the space between the upper partition 4 and the lower partition 5. A support frame 12 is also arranged at the bottom of the shell 2.

[0022] The present invention provides partition rubber strips, baffle rubber strips and edge strips to ensure that all leakage points on the evaporator that affect the efficiency of the heat exchanger are sealed, thereby reducing the possibility of airflow leakage or bypass.

[0023] The evaporator designed in the present invention is mainly a further improvement on the original evaporator, which improves the heat exchange efficiency, reduces the welding amount, and improves the safety of maintenance. It can achieve the purpose of energy saving and efficiency improvement while reducing the volume and weight of the evaporator.

[0024] Example 1 The compressors configured in the precooler of the present invention are two screw or scroll refrigerant compressors with a flow rate of 50%, one of which is a variable frequency compressor, and the configured evaporator is an integral multi-pass tube-sheet heat exchanger, which saves energy and increases efficiency while reducing the volume and weight of the evaporator. The compressor unit uses two screw or scroll refrigerant compressors with a flow rate of 50%, and its cooling capacity adjustment range can reach 25%~100%.

[0025] The evaporator of the present invention adopts a two-tube pass design, and the evaporator is provided with a return hood and a return hood for evenly dispersing the refrigerant in the heat exchange tube.

[0026] The precooler evaporator of the present invention is provided with rubber strips on the upper and lower partitions and baffles to prevent the phenomenon of airflow cross-flow short circuit, improve the heat exchange efficiency, and further reduce the volume and weight of the evaporator; The two ends of the evaporator are made into fixed tube sheets, and the tube heads and tube sheets are expanded first and then welded, with less welding and PT testing; During maintenance, there is no need to remove the core. Cleaning, plugging and other maintenance operations can be performed by simply removing the shell cover, greatly reducing subsequent maintenance costs.

[0027] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A precooler evaporator with high sealing performance, comprising an evaporator body, characterized in that: The evaporator body is composed of a shell, a shell cover, and a heat exchange component. The shell is designed to be circular as a whole and is sealed at both ends of the shell by the shell cover. An upper partition and a lower partition are respectively arranged in the shell. Multiple sets of heat exchange components are placed between the upper partition and the lower partition. Coolant flows through the heat exchange component. Liquid inlets and outlets are also opened on the sides of the shell.

2. The high-sealing precooler evaporator according to claim 1 is characterized in that: The heat exchange assembly is composed of multiple heat exchange tubes, multiple fins, and a shell cover. Each fin is provided with two groups of through holes, one above the other, with a certain distance between the two groups of through holes. The upper through holes are liquid inlet group through holes, and the lower through holes are liquid outlet group through holes. Heat exchange tubes are installed on the liquid inlet group through holes and the liquid outlet group through holes. The ends of the two groups of heat exchange tubes are connected with a shell cover. A protruding return door is provided on the shell cover at the ends of the two groups of heat exchange tubes. A protruding return cover is provided on the return door, so that the upper coolant can flow into the heat exchange tube below through the return cover, and a cooling liquid inlet flange and a cooling liquid outlet flange are provided on the return cover on one side. A plurality of baffles are also placed between the multiple fins.

3. The high-sealing precooler evaporator according to claim 2 is characterized in that: One side of the baffle is close to the inner wall of the shell, and the other side is parallel to the edge of the fin. The front and rear baffles are arranged oppositely to change the flow direction of the liquid and fully react with each heat exchange unit. A baffle rubber strip is also arranged on one edge of the baffle located on the inner wall of the shell.

4. The high-sealing precooler evaporator according to claim 1 is characterized in that: A partition rubber strip is installed on one side of the upper partition and the lower partition near the edge of the shell. One side of the partition rubber strip is wrapped around the partition, and the other side is provided with an edge strip that is spread out in an eight-shaped shape. The partition rubber strip makes the space inside the upper partition and the lower partition form an enclosed space.

5. The high-sealing precooler evaporator according to claim 1, characterized in that: A supporting frame is also arranged at the bottom of the shell.

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