Microchannel heat exchanger for cooling water systems in modified plastics production lines

Abstract

This utility model relates to a microchannel heat exchanger for a cooling water system in a modified plastics production line. It includes a shell, a heat exchange chamber inside the shell, and a heat exchange assembly inside the heat exchange chamber. The heat exchange assembly includes a liquid collecting pipe and a heat exchange plate. The liquid collecting pipe is connected to the heat exchange plate, which has several hot oil channels arranged in a "U" shape. A baffle is provided in the middle section of the liquid collecting pipe, dividing it into an oil inlet chamber and an oil outlet chamber. The two ends of the hot oil channels are connected to the oil inlet chamber and the oil outlet chamber, respectively. An oil inlet and an oil outlet are provided at both ends of the oil collecting pipe. A positioning groove is provided inside the heat exchange chamber, and a disassembly port aligned with the positioning groove is provided at one end of the shell. The heat exchange plate passes through the disassembly port and moves along the positioning groove to be installed in the heat exchange chamber, significantly improving the heat transfer coefficient between the hot oil and the cooling water, ensuring that the cooling water system can remove heat more efficiently. The entire heat exchange assembly can be modularly installed by pulling it out.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and in particular to a microchannel heat exchanger for a cooling water system in a modified plastics production line. Background Technology

[0002] In the production of modified plastics, precise temperature control is required for key components such as the barrel and die of a twin-screw extruder. The cooling water system is a core auxiliary system that ensures continuous and stable production and guarantees product quality. The heat exchanger is a key piece of equipment in this system, and its function is to efficiently exchange the heat carried by the cooling water from the production equipment to an external cold source, such as a cooling tower or chiller unit, so that the cooled water can be recycled after cooling.

[0003] Traditional shell-and-tube or plate heat exchangers, widely used in cooling water systems for modified plastics production lines, have some inherent drawbacks. First, their heat exchange channels are typically wide, and poor fluid path design results in limited heat exchange efficiency, especially when handling high-viscosity hot oils, where the heat transfer coefficient is low, making it difficult to meet the stringent requirements of modern high-efficiency production lines for cooling efficiency and energy consumption. Second, when scaling or blockage occurs inside the heat exchanger, the entire equipment often needs to be shut down and undergo cumbersome disassembly and cleaning, leading to high maintenance costs and disruption to production continuity. Furthermore, the internal flow channel design of traditional heat exchangers easily leads to uneven fluid distribution and creates heat exchange dead zones, preventing the full utilization of overall heat exchange efficiency and the inadequate use of the temperature difference between hot and cold fluids. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a microchannel heat exchanger for cooling water system of modified plastic production line, which can effectively solve the technical problems of complex maintenance and low heat exchange efficiency.

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

[0006] A microchannel heat exchanger for a cooling water system in a modified plastics production line includes a shell with a heat exchange chamber inside. The surface of the shell has an inlet and an outlet, both connected to the heat exchange chamber. The heat exchange chamber contains a heat exchange assembly, including a liquid collecting pipe and a heat exchange plate. The liquid collecting pipe is connected to the heat exchange plate, which has several hot oil channels arranged in a "U" shape. A baffle plate is installed in the middle section of the liquid collecting pipe, dividing it into an inlet chamber and an outlet chamber. The two ends of the hot oil channels are connected to the inlet and outlet chambers, respectively. The two ends of the liquid collecting pipe have inlets and outlets. A positioning groove is provided inside the heat exchange chamber. One end of the shell has a disassembly / assembly port aligned with the positioning groove. The heat exchange plate passes through the disassembly / assembly port and moves along the positioning groove to be installed into the heat exchange chamber. The liquid collecting pipe is located outside the shell. A sealing plate is installed between the liquid collecting pipe and the heat exchange plate, sealing the disassembly / assembly port.

[0007] Furthermore, the heat exchange plate is composed of two metal plates, with a "U"-shaped microchannel on one side of each metal plate facing each other. The sides of the two metal plates with the microchannels are welded together, and the two microchannels are combined to form a hot oil channel.

[0008] Furthermore, a sealing gasket is provided between the two metal plates, and the sealing gasket is located around the hot oil flow channel.

[0009] Furthermore, the heat exchange components are provided in two or more sets, and the two or more sets of heat exchange components are arranged in parallel with each other.

[0010] Furthermore, a partition is provided inside the heat exchange cavity, the partition is distributed on both sides of the heat exchange plate in the width direction, the heat exchange plates on both sides are staggered, and a positioning groove is provided in the partition.

[0011] Furthermore, the hot oil flow channel is provided with turbulence fins, which are spirally distributed.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: Multiple U-shaped micro-scale hot oil flow channels are arranged within the heat exchange plate, increasing the heat exchange area per unit volume, shortening the heat diffusion distance, and extending the residence time of the hot oil within the heat exchange plate, promoting turbulence. This significantly improves the heat transfer coefficient between the hot oil and cooling water, ensuring that the cooling water system can remove heat more efficiently. By providing disassembly ports on the outer shell and positioning grooves within the heat exchange cavity, the entire heat exchange assembly can be modularly installed using a pull-out design. When a single heat exchange assembly needs cleaning or maintenance, it is not necessary to disassemble the entire heat exchanger shell; simply pull the corresponding module out of the groove. This greatly simplifies the maintenance process, shortens production line downtime, and improves equipment utilization and production efficiency. Attached Figure Description

[0013] Figure 1 This is the main view of the present invention.

[0014] Figure 2 This is a top view of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the partition plate and heat exchange plate of this utility model;

[0016] Figure 4 This is a structural diagram of the heat exchange plate and liquid collecting pipe in this utility model;

[0017] Figure 5 This is a schematic diagram of the hot oil flow channel in this utility model;

[0018] The numbers in the diagram are: 1-outer shell, 2-heat exchange chamber, 3-water inlet, 4-water outlet, 5-liquid collection pipe, 501-oil inlet chamber, 502-oil outlet chamber, 6-heat exchange plate, 601-metal plate, 602-hot oil flow channel, 7-partition plate, 8-sealing plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] The following is combined with Figures 1-5 The present invention provides a detailed description of a microchannel heat exchanger for a cooling water system in a modified plastics production line:

[0021] A microchannel heat exchanger for a cooling water system in a modified plastics production line includes a housing 1, within which a heat exchange chamber 2 is located. An inlet 3 and an outlet 4 are located on the surface of the housing 1, both communicating with the heat exchange chamber 2. A heat exchange assembly is located within the heat exchange chamber 2, comprising a liquid collecting pipe 5 and a heat exchange plate 6. The liquid collecting pipe 5 is connected to the heat exchange plate 6, which contains several hot oil channels 602 in a U-shape. A baffle 7 is located in the middle section of the liquid collecting pipe 5, dividing the pipe into an inlet chamber 501 and an outlet chamber 501. The oil chamber 502 and the hot oil flow channel 602 are respectively connected to the oil inlet chamber 501 and the oil outlet chamber 502. The oil collecting pipe is equipped with an oil inlet and an oil outlet at both ends. The heat exchange chamber 2 is provided with a positioning slide groove. One end of the outer shell 1 is provided with a disassembly port aligned with the positioning slide groove. The heat exchange plate 6 passes through the disassembly port and moves along the positioning slide groove to be installed in the heat exchange chamber 2. The liquid collecting pipe 5 is located on the outside of the outer shell 1. A sealing plate 8 is provided between the liquid collecting pipe 5 and the heat exchange plate 6. The sealing plate 8 covers and seals the disassembly port. The sealing plate 8 is connected to the outer shell 1 by bolts. A sealing ring is provided on the inner wall of the sealing plate 8. The heat exchange components are arranged in four groups, which are arranged in parallel along the length of the outer shell 1. Cooling water flow gaps are reserved between adjacent heat exchange components. The multiple parallel heat exchange components can significantly increase the total heat exchange area. At the same time, the reserved gaps ensure that cooling water can flow evenly over the surface of each heat exchange plate 6, avoiding local water flow dead zones. The parallel layout ensures that the heat exchange conditions of each component are consistent, ensuring stable overall heat exchange efficiency.

[0022] The increased heat exchange area per unit volume shortens the heat diffusion distance, and the "U"-shaped path extends the residence time of hot oil within the heat exchange plate 6, promoting turbulence and significantly improving the heat transfer coefficient between the hot oil and cooling water. This ensures the cooling water system can remove heat more efficiently. By providing a disassembly port on the outer shell 1 and a positioning groove in the heat exchange chamber 2, the entire heat exchange assembly can be modularly installed using a pull-out design. When a single heat exchange component requires cleaning or maintenance, it is not necessary to disassemble the entire heat exchanger shell 1; simply pull the corresponding module out of the groove. This greatly simplifies the maintenance process, reduces production line downtime, and improves equipment utilization and production efficiency.

[0023] The heat exchange plate 6 consists of two metal plates 601. The opposing sides of the two metal plates 601 are etched to form "U"-shaped microchannels. The sides of the two metal plates 601 with microchannels are welded together for sealing. The two microchannels combine to form a hot oil channel 602. The dimensional accuracy of the microchannels can be precisely controlled through etching or stamping processes, ensuring uniform hot oil flow. The welded seal can withstand the pressure of high-temperature hot oil, avoiding the leakage risk of traditional sealing methods. Simultaneously, the high thermal conductivity of the metal material reduces thermal resistance and improves heat exchange efficiency. A sealing gasket is placed between the two metal plates 601. The sealing gasket is made of an oil-resistant and high-temperature-resistant elastic material, such as nitrile rubber or fluororubber, and is located around the hot oil channel 602. This enhances the sealing performance of the channel, preventing hot oil from seeping into the cooling water side and causing contamination. The elastic material can buffer welding stress and deformation caused by thermal expansion and contraction, extending the service life of the heat exchange plate 6.

[0024] The heat exchange chamber 2 is equipped with baffles 7, which are distributed on both sides of the heat exchange plates 6 in the width direction. The heat exchange plates 6 on both sides are staggered. Positioning grooves are set in the baffles 7, which separate the flow channels, extend the water flow path and enhance the turbulence, forcing the water flow to make full contact with the heat exchange plates 6. The precise matching of the positioning grooves and the heat exchange plates 6 ensures the stability after installation and prevents vibration caused by water flow impact during operation.

[0025] Furthermore, the hot oil flow channel 602 is provided with turbulence fins, which are spirally distributed. The spirally distributed irregular turbulence fins can break the laminar flow state of the hot oil in the flow channel and form strong turbulence by cutting and stirring, thereby accelerating the renewal of the thermal boundary layer.

[0026] Heat exchange process: In modified plastics production, high-temperature hot oil first enters the oil inlet chamber 501 through the oil inlet of the liquid collection pipe 5, and is distributed to each microchannel through the inlet end of the "U"-shaped hot oil flow channel 602, as shown in the figure. During the flow of the hot oil along the "U"-shaped path, the spiral turbulence fins within the flow channel force the hot oil to rotate and turbulent, enhancing the heat exchange between the oil flow and the flow channel wall. Simultaneously, cooling water enters the heat exchange chamber 2 from the water inlet 3 of the outer shell 1, as shown in the figure. Figure 1As shown, the flow is guided by the baffle 7 to form a baffle, flowing evenly over the surfaces of the parallel heat exchange plates 6. At this time, the heat of the hot oil is rapidly transferred to the cooling water through the metal heat exchange plates 6. The high-temperature hot oil cools down due to heat dissipation and eventually collects in the oil outlet chamber 502 and is discharged from the oil outlet. The cooling water, after absorbing heat, has an increased temperature and flows out from the water outlet 4 of the outer shell 1, completing one heat exchange cycle.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A microchannel heat exchanger for a cooling water system in a modified plastics production line, comprising a shell, a heat exchange chamber disposed within the shell, and an inlet and an outlet disposed on the surface of the shell, both the inlet and the outlet communicating with the heat exchange chamber, characterized in that: The heat exchange chamber is equipped with a heat exchange assembly, which includes a liquid collecting pipe and a heat exchange plate. The liquid collecting pipe is connected to the heat exchange plate, and the heat exchange plate has several hot oil channels in a "U" shape. A baffle is provided in the middle section of the liquid collecting pipe, which divides the liquid collecting pipe into an oil inlet chamber and an oil outlet chamber. The two ends of the hot oil channels are connected to the oil inlet chamber and the oil outlet chamber, respectively. The two ends of the liquid collecting pipe are equipped with an oil inlet and an oil outlet. A positioning groove is provided in the heat exchange chamber. One end of the outer shell is provided with a disassembly port aligned with the positioning groove. The heat exchange plate passes through the disassembly port and moves along the positioning groove to be installed in the heat exchange chamber. The liquid collecting pipe is located on the outside of the outer shell. A sealing plate is provided between the liquid collecting pipe and the heat exchange plate, and the sealing plate covers and seals the disassembly port.

2. The microchannel heat exchanger for a cooling water system of a modified plastics production line according to claim 1, characterized in that: The heat exchange plate consists of two metal plates. The opposite sides of the two metal plates are provided with "U"-shaped microchannels. The sides of the two metal plates with microchannels are welded together, and the two microchannels are combined to form a hot oil channel.

3. The microchannel heat exchanger for a cooling water system of a modified plastics production line according to claim 2, characterized in that: A sealing gasket is provided between the two metal plates, and the sealing gasket is located around the hot oil flow channel.

4. The microchannel heat exchanger for a cooling water system of a modified plastics production line according to any one of claims 1 to 3, characterized in that: The heat exchange components are provided in two or more sets, and the two or more sets of heat exchange components are arranged in parallel with each other.

5. The microchannel heat exchanger for a cooling water system of a modified plastics production line according to any one of claims 1 to 3, characterized in that: The heat exchange chamber is equipped with partitions, which are distributed on both sides of the heat exchange plates in the width direction. The heat exchange plates on both sides are staggered, and positioning grooves are provided in the partitions.

6. The microchannel heat exchanger for a cooling water system of a modified plastics production line according to any one of claims 1 to 3, characterized in that: The hot oil flow channel is equipped with turbulence fins, which are spirally distributed.

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