Airless resistance type shunt heat exchange pipeline, heat exchange equipment and heat exchange net changer

Abstract

This utility model discloses a non-air-resistance split-flow heat exchange pipeline, as well as a heat exchange device and screen changer including the above-mentioned pipeline. The non-air-resistance split-flow heat exchange pipeline includes a split-flow heat exchange unit disposed on a medium conveying pipeline. Each split-flow heat exchange unit includes several heat exchange tubes arranged in parallel, arranged from top to bottom. Inverted U-shaped bends are provided on both the inlet and outlet sides of the medium conveying pipeline for each heat exchange tube, with the bends of the inverted U-shaped bends higher than the highest point of the heat exchange tubes. When this heat exchange pipeline is applied to a screen changer, the temperature difference between the upper and lower parts of the inlet and outlet areas can be eliminated, ensuring uniform temperature across all areas. This effectively solves the problem of mesh belt skewing in mesh belt screen changers, preventing mesh jamming and mesh belt breakage, reducing maintenance frequency, lowering labor intensity, improving production efficiency, minimizing product energy consumption and production costs, and ensuring a high product qualification rate.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a non-air-resistance split-flow heat exchange pipeline, heat exchange equipment and screen changer. Background Technology

[0002] A heat exchanger is a device that transfers heat between different media and is widely used in thermal management systems in industrial processes such as chemical, energy, and pharmaceutical industries. In polymer material production, extruders are typically equipped with screen changers at the inlet to filter impurities in the melt and ensure continuous and stable production. Cooling pipes are installed in both the inlet and outlet zones of this screen changer to cool and solidify the molten material, thereby creating a sealed environment within the filtration chamber.

[0003] Currently, this type of cooling piping often uses a single inlet and outlet type single water circuit (see...). Figure 1 ) or a dual-inlet, dual-outlet type dual-waterway (see Figure 2 Regardless of the specific structure, all conveyor belts suffer from uneven cooling and inconsistent temperature distribution within the same area. Specifically, the upper part of the belt tends to be warmer than the lower part, resulting in a faster speed for the conveyor belt at the top and a slower speed at the bottom due to lower temperature and greater shrinkage. For example... Figure 3 As shown, the asynchronous speeds of the upper and lower mesh belts can easily cause the mesh belt to tilt, causing its edges to deviate from the filtration area and severely affecting filtration efficiency. Simultaneously, the lower mesh belt, operating at a lower temperature, is prone to wrinkling due to contraction. As wrinkles accumulate, the mesh belt struggles to smoothly enter the narrow mesh channel, leading to anything from mesh jamming (i.e., the mesh belt stopping) to, in severe cases, mesh belt breakage.

[0004] To address the aforementioned issues, ZL201621456757.2 discloses a heat exchange pipeline comprising a split-flow heat exchange unit, wherein each split-flow heat exchange unit includes a longitudinal annular pipe, and an inlet and an outlet are respectively located at the midpoint of the two longitudinal pipe sections of the longitudinal annular pipe (see...). Figure 4 When cooling water enters the longitudinal annular pipe, it splits into upper and lower streams for simultaneous heat exchange, ensuring consistent temperatures between the two sections and preventing the mesh from skewing. However, in practice, it has been found that achieving automatic splitting of the water flow requires relatively high water pressure and flow rate. When the water pressure is too low and / or the flow rate is too low, air resistance can easily form in the upper part of the cooling water path due to gravity, causing the water to flow directly through the lower part instead of the upper part (see...). Figure 5 This results in a greater temperature difference between the upper and lower parts of the netting area and the netting exit area, further exacerbating the abnormal netting phenomenon. Summary of the Invention

[0005] To eliminate the ineffective heat exchange phenomenon caused by air resistance in the upper section of a split-flow heat exchange unit, this utility model provides an air resistance-free split-flow heat exchange pipeline, a heat exchange device including the above-mentioned air resistance-free split-flow heat exchange pipeline, and a screen exchanger including the above-mentioned air resistance-free split-flow heat exchange pipeline. Specifically, the following technical solutions can be adopted: The air resistance-free diversion heat exchange pipeline of this utility model includes a diversion heat exchange unit installed on the medium conveying pipeline. The diversion heat exchange unit includes a plurality of heat exchange tubes arranged in parallel. The heat exchange tubes are arranged from top to bottom, and inverted U-shaped bends are provided on the medium conveying pipeline on both the inlet side and the outlet side of the heat exchange tubes. The bending part of the inverted U-shaped bend is set higher than the highest point of the heat exchange tube.

[0006] This invention ensures sufficient heat exchange between the upper and lower sections by using heat exchange tubes arranged in parallel. At the same time, by setting inverted U-shaped bends higher than the heat exchange tubes on the medium conveying pipelines on the inlet and outlet sides of the heat exchange tubes, it avoids air resistance in the higher pipelines within the split-flow heat exchange unit, thus preventing water from flowing only in the lower pipelines within the split-flow heat exchange unit. This solves the problem of uneven heat exchange between the upper and lower parts of the heat exchange pipeline under low flow and low water pressure conditions.

[0007] Preferably, the heat exchange tubes are arranged in the same vertical plane, with at least one heat exchange tube positioned above the medium transport pipeline and at least one positioned below the medium transport pipeline. Further, each split-flow heat exchange unit includes two heat exchange tubes arranged in parallel, forming a U-shaped structure distributed in the same vertical plane. This invention minimizes the resistance to fluid medium transport by arranging the heat exchange tubes in the same plane, and ensures uniform heat exchange between the upper and lower sections by placing heat exchange tubes both above and below the transport pipeline.

[0008] Preferably, two or more split-flow heat exchange units are connected in series on the medium conveying pipeline. The heat exchange tubes of adjacent split-flow heat exchange units are arranged parallel to each other, and the inlet and outlet of the heat exchange tubes on the same side of adjacent split-flow heat exchange units are alternately arranged. By alternating the inlet and outlet of the heat exchange tubes on the same side of adjacent split-flow heat exchange units, this invention allows the medium conveying pipeline section connecting the two units to be located close to one side of the split-flow heat exchange unit, reducing the pipe section length, improving fluid conveying efficiency, and simultaneously improving the standardization and aesthetics of the connecting pipe section arrangement.

[0009] Preferably, an inverted U-shaped bend is provided on the medium delivery pipeline between adjacent split-flow heat exchange units. Experiments have shown that providing an inverted U-shaped bend on the medium delivery pipeline between adjacent split-flow heat exchange units, along with additional inverted U-shaped bends at the inlet and outlet ends of the medium delivery pipeline, ensures that the heat exchange medium flows uniformly through all heat exchange tubes within the split-flow heat exchange unit. This simplifies pipeline design, saves pipeline materials, and improves installation efficiency.

[0010] Preferably, the bends of the inverted U-shaped bends are all set at the same height. By setting all the bends of the inverted U-shaped bends at the same height, the pipeline design is simplified, and it is beneficial to determine the minimum pressure and minimum flow rate for heat exchange medium transportation.

[0011] Preferably, an exhaust valve is provided at the highest point of the heat exchange tube at the top of each of the diversion heat exchange units. By providing an exhaust valve at the highest point of the heat exchange tube at the top of each diversion heat exchange unit, it is beneficial to observe whether the diversion heat exchange pipeline without air resistance is in a full-pipe state. In case of unexpected air resistance, it is easy to vent the air, ensuring the normal operation of the heat exchange pipeline.

[0012] This utility model also provides a heat exchange device, which is provided with a heat exchange pipeline. The heat exchange pipeline adopts any of the above-mentioned air resistance-free diversion heat exchange pipelines, which can meet the equipment's high requirements for uniform heat exchange even when the heat exchange medium flow rate is small and the pressure is low.

[0013] This utility model also provides a screen changer, which includes a filter belt with a screen running sequentially along the inlet area, the filtration area, and the outlet area, and a heat exchange pipeline disposed in the inlet area and the outlet area. The heat exchange pipeline adopts the aforementioned air-resistance-free diversion heat exchange pipeline. By adopting the air-resistance-free diversion heat exchange pipeline of this utility model, not only can the temperature difference between the upper and lower parts of the inlet and outlet areas be effectively avoided, but the air resistance phenomenon at the upper part of the diversion heat exchange unit can also be eliminated under low water flow and low water pressure conditions. This achieves uniform temperature between the upper and lower parts of the cooling body, effectively solving the problem of screen belt skewing under low water flow and low water pressure conditions during initial water supply and long-term operation, thereby reducing the failure rate of the screen belt screen changer and achieving the purpose of energy saving and improving production efficiency.

[0014] Preferably, the inlet and outlet areas are each equipped with at least one diversion heat exchange unit, and the filter area is provided with an inverted U-shaped bend connecting the inlet and outlet diversion heat exchange units. This invention employs a single-inlet, single-outlet, airtight diversion heat exchange pipeline, simplifying pipeline design and improving on-site installation efficiency.

[0015] Preferably, the heat exchange tubes of the split-flow heat exchange unit are disposed within the shells of the inlet and outlet areas, and the inverted U-shaped bends are disposed on the outer surfaces of the shells of the inlet, filtration, and outlet areas. Since the inlet and outlet of the heat exchange tubes on the same side of adjacent split-flow heat exchange units are alternately arranged, the medium transport pipe section connecting the two can be disposed close to one side of the split-flow heat exchange unit. Even if the inverted U-shaped bend connecting adjacent split-flow heat exchange units is disposed on one side of the shell, it helps to reduce the pipe length, improve fluid transport efficiency, and simultaneously improve the standardization and aesthetics of the connecting pipe section arrangement.

[0016] This utility model provides a non-air-resistance split-flow heat exchange pipeline, which can be applied to screen exchangers and other operating conditions where the heat exchange medium flow rate is small and the pressure is unstable, but the temperature uniformity of the cooling components is required. Because the medium conveying pipeline is equipped with inverted U-shaped bends before and after the split-flow heat exchange unit, and the bending parts of the inverted U-shaped bends are all higher than the highest point of the heat exchange tubes, it effectively avoids air resistance in the higher pipes within the split-flow heat exchange unit, preventing water from flowing only in the lower pipes, thus ensuring uniform heat exchange. For screen exchangers, it eliminates the temperature difference between the upper and lower parts of the inlet and outlet areas, ensuring consistent temperature across all areas. This effectively solves the problem of screen belt skewing in belt-type screen exchangers, preventing screen jamming and belt breakage. Therefore, it reduces maintenance frequency, lowers labor intensity, improves production efficiency, minimizes product energy consumption and production costs, and ensures a high product qualification rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing one-inlet-one-outlet cooling water circuit.

[0018] Figure 2 This is a schematic diagram of an existing two-inlet, two-outlet cooling water circuit.

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of a belt-type screen changer where the mesh belt tilts and wrinkles.

[0020] Figure 4 This is a schematic diagram of the structure of an existing split-flow heat exchange unit.

[0021] Figure 5 This is a schematic diagram of the structure of a screen exchanger using a split-flow heat exchange unit, where the screen belt is tilted and wrinkles are generated.

[0022] Figure 6 This is a schematic diagram of the structure of the air resistance-free split-flow heat exchange pipeline described in Example 1.

[0023] Figure 7It is a schematic structural diagram of the heat exchange pipeline of the screen changer described in Embodiment 2.

[0024] Figure 8 is Figure 7 the unfolded structural diagram of the heat exchange pipeline in Detailed implementation manners

[0025] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments.

[0026] Embodiment 1: The air-free resistance type shunt heat exchange pipeline described in the present utility model includes a shunt heat exchange unit arranged on a medium输送 pipeline. The shunt heat exchange unit includes a plurality of heat exchange pipes arranged in parallel. The heat exchange pipes are arranged from top to bottom, and inverted U-shaped bends are arranged on both the inlet side and the outlet side of the medium输送 pipeline of the heat exchange pipes. The bending parts of the inverted U-shaped bends are all arranged higher than the highest point of the heat exchange pipes.

[0027] Specifically, as Figure 6 shown, a first inverted U-shaped bend 2, a shunt heat exchange unit, and a second inverted U-shaped bend 3 are sequentially arranged on the medium输送 pipeline 1. The above-mentioned shunt heat exchange unit includes an upper section heat exchange pipe 4 and a lower section heat exchange pipe 5 located in the same plane. The upper section heat exchange pipe 4 and the lower section heat exchange pipe 5 are arranged in parallel. The water inlet 6 where they meet is connected to the outlet of the first inverted U-shaped bend 2, and the water outlet 7 where they meet is connected to the inlet of the second inverted U-shaped bend 3 (that is, a middle character structure is formed). Moreover, the upper section heat exchange pipe 4 is located above the water inlet 6 and the water outlet 7 and is used for heat exchange in the upper area where it is located; the lower section heat exchange pipe 5 is located below the water inlet 6 and the water outlet 7 and is used for heat exchange in the lower area where it is located. The bending parts of the above-mentioned first inverted U-shaped bend 2 and second inverted U-shaped bend 3 have the same height and are both arranged higher than the highest point of the upper section heat exchange pipe 4.

[0028] Furthermore, according to the heat exchange requirements, the number of heat exchange pipes can be increased. Among them, at least one should be arranged above the medium输送 pipeline 1, and at least one should be arranged below the medium输送 pipeline 1, so that heat exchange can be realized in both the upper and lower sections. More specifically, the same number of heat exchange pipes are symmetrically arranged above and below the medium输送 pipeline 1. The above-mentioned heat exchange pipes arranged in parallel in the same group are all located in the same vertical plane and are arranged from top to bottom, which can reduce the resistance of fluid medium输送 as much as possible and enable the upper and lower fluids to fully exchange heat with the external environment.

[0029] Due to gravity, when the water pressure is too low and / or the water flow is too small, the heat exchange tube located above the medium conveying pipeline 1 is prone to air resistance, causing the heat exchange medium to pass directly through the heat exchange tube below the medium conveying pipeline 1 instead of flowing through the upper heat exchange tube. Therefore, this utility model sets inverted U-shaped bends (i.e., the first inverted U-shaped bend 2 and the second inverted U-shaped bend 3) higher than the highest point of the heat exchange tube at both ends of the medium conveying pipeline 1 (i.e., the inlet side and the outlet side) of the same group of heat exchange tubes, thereby ensuring that the heat exchange medium can fill the entire heat exchange pipeline. Even if the water pressure is too low and / or the water flow is too small, there will be no phenomenon of not passing through the upper heat exchange tube, so that the upper and lower parts of the split heat exchange unit can exchange heat and achieve the same temperature in the upper and lower parts of the cooling body.

[0030] Preferably, the inverted U-shaped bends at both ends of the heat exchange tube are set at the same height, which simplifies the pipeline design and helps to determine the minimum pressure and minimum flow rate for the heat exchange medium. Furthermore, an exhaust valve is installed at the highest point of the upper heat exchange tube 4 (i.e., the heat exchange tube at the top of each diversion heat exchange unit).

[0031] When using the equipment, first fill the heat exchanger tubes completely and maintain a continuous flow of water. Then, open the vent valve at the highest point of the heat exchanger tubes. If water flows out, the filling is complete. At this point, adjust the water pressure and flow rate according to the operating requirements to put the heat exchanger tubes into operation.

[0032] Example 2: In practical applications, more than one diversion heat exchange unit is typically installed on the medium transport pipeline 1. In this case, the diversion heat exchange units are connected in series on the medium transport pipeline 1, and only one inverted U-shaped bend is provided between adjacent diversion heat exchange units. Preferably, the heat exchange tubes of all diversion heat exchange units are arranged parallel to each other, and the inlet and outlet of the heat exchange tubes on the same side of adjacent diversion heat exchange units are alternately arranged (see...). Figure 7 This allows the medium transport pipe section connecting the two to be set up close to one side of the split heat exchange unit, facilitating the installation of an inverted U-shaped bend on the same side of the split heat exchange unit, thereby reducing the pipe length, improving fluid transport efficiency, and enhancing the standardization and aesthetics of the connecting pipe section installation.

[0033] The aforementioned airtight, shunt-free shunt heat exchange piping, comprising multiple shunt heat exchange units and inverted U-shaped bends, can be applied to screen exchangers in the field of polymer materials, as well as to other equipment with low heat exchange medium flow rates and pressures, and high requirements for uniform heat exchange. The following explanation uses a screen exchanger as an example.

[0034] like Figure 7 , Figure 8The screen exchanger shown includes a filter belt L that runs sequentially along the inlet area A, the filter area B, and the outlet area C. It also includes heat exchange pipes installed in the inlet area A and the outlet area C. These heat exchange pipes are the air-resistance-free split-flow heat exchange pipes described in this invention, incorporating split-flow heat exchange units and inverted U-shaped bends. Specifically, the inlet area A is equipped with a first split-flow heat exchange unit 8, and the outlet area C is equipped with a second split-flow heat exchange unit 9 and a third split-flow heat exchange unit 10. Each of these units employs a parallel U-shaped pipe system containing two heat exchange tubes. The three parallel U-shaped pipe systems are of equal size, correspondingly positioned within three vertical planes of the screen exchanger housing, and are all perpendicular to the screen running direction.

[0035] The inlet of the first split-flow heat exchange unit 8 is located on the rear side of the screen exchanger housing, and the outlet is located on the front side of the screen exchanger housing; the inlet of the second split-flow heat exchange unit 9 is located on the front side of the screen exchanger housing, and the outlet is located on the rear side of the screen exchanger housing; the inlet of the third split-flow heat exchange unit 10 is located on the rear side of the screen exchanger housing, and the outlet is located on the front side of the screen exchanger housing. Therefore, an inverted U-shaped bend is provided on the medium conveying pipeline 1 at the inlet end of the first split-flow heat exchange unit 8, located on the rear side of the screen exchanger housing; an inverted U-shaped bend that completely passes through the filter zone B is provided on the medium conveying pipeline 1 between the first split-flow heat exchange unit 8 and the second split-flow heat exchange unit 9, located on the front side of the screen exchanger housing; an inverted U-shaped bend is provided on the medium conveying pipeline 1 between the second split-flow heat exchange unit 9 and the third split-flow heat exchange unit 10, located on the rear side of the screen exchanger housing; and an inverted U-shaped bend is provided on the medium conveying pipeline 1 on the rear side of the third split-flow heat exchange unit 10, located on the front side of the screen exchanger housing. The aforementioned inverted U-shaped bends are arranged at the same height, with the bends all higher than the highest point of the heat exchange tubes in the split-flow heat exchange unit.

[0036] The air-resistance-free split-flow heat exchange pipeline used in the aforementioned screen exchanger effectively avoids air resistance in the higher pipes of the split-flow heat exchange unit, preventing water flow from being restricted to the lower pipes, even under conditions of low heat exchange medium flow and unstable pressure. This ensures uniform heat exchange. Consequently, it eliminates the temperature difference between the upper and lower parts of the screen exchanger's inlet and outlet areas, ensuring consistent temperatures across all zones. This effectively solves the problem of mesh belt skewing in belt-type screen exchangers, preventing mesh jamming and belt breakage. Therefore, it reduces maintenance frequency, lowers worker workload, improves production efficiency, minimizes product energy consumption and production costs, and guarantees a high product qualification rate.

[0037] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A non-restrictive split-flow heat exchange pipeline, characterized in that: The device includes a split-flow heat exchange unit installed on a medium conveying pipeline. The split-flow heat exchange unit includes several heat exchange tubes arranged in parallel. The heat exchange tubes are arranged from top to bottom, and inverted U-shaped bends are provided on both the inlet and outlet sides of the medium conveying pipeline. The bends of the inverted U-shaped bends are all set higher than the highest point of the heat exchange tubes.

2. The gas-free resistance shunt heat exchanger circuit according to claim 1, characterized in that: The heat exchange tubes are arranged in the same vertical plane, with at least one heat exchange tube positioned above the medium conveying pipeline and at least one heat exchange tube positioned below the medium conveying pipeline.

3. The gas-free resistance shunt heat exchanger circuit according to claim 1, characterized in that: Two or more split-flow heat exchange units are connected in series on the medium conveying pipeline. The heat exchange tubes of adjacent split-flow heat exchange units are arranged in parallel, and the inlet and outlet of the heat exchange tubes on the same side of adjacent split-flow heat exchange units are alternately arranged.

4. The gas-free flow dividing heat exchanging pipeline according to claim 3, characterized in that: An inverted U-shaped bend is provided on the medium delivery pipeline between adjacent split-flow heat exchange units.

5. The gas-free flow dividing heat exchanging pipe line as claimed in claim 1, wherein: The curved portions of the inverted U-shaped bend are all set at the same height.

6. The gas-free flow dividing heat exchanging pipe line as claimed in claim 1, wherein: An exhaust valve is provided at the highest point of the heat exchange tube at the top of each of the aforementioned split-flow heat exchange units.

7. A heat exchange apparatus, characterized by: The system is equipped with heat exchange pipelines, wherein the heat exchange pipelines are the air resistance-free diversion heat exchange pipelines described in any one of claims 1-6.

8. A screen changer, comprising a filter belt that runs sequentially along an inlet zone, a filter zone, and an outlet zone, characterized in that: It also includes heat exchange pipelines installed in the inlet and outlet areas, wherein the heat exchange pipelines adopt the air resistance-free diversion heat exchange pipelines as described in any one of claims 1-6.

9. The screen changer according to claim 8, characterized in that: The inlet and outlet areas are each equipped with at least one diversion heat exchange unit, and the filter area is equipped with an inverted U-shaped bend connecting the inlet diversion heat exchange unit and the outlet diversion heat exchange unit.

10. The screen changer according to claim 9, characterized in that: The heat exchange tubes of the split-flow heat exchange unit are installed inside the shells of the inlet and outlet areas, and the inverted U-shaped bends are installed on the outer surfaces of the shells of the inlet, filtration, and outlet areas.

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