Dyeing and printing cooling wastewater recycling equipment

Abstract

This application relates to the technical field of wastewater utilization and provides a device for recycling dyeing and printing wastewater. The device includes a heat exchange box for exchanging heat with the dyeing and printing wastewater and a filter box for purifying and filtering the wastewater after heat exchange. The heat exchange box contains a hot water pipe. A first inlet pipe for wastewater to enter the heat exchange box and a first outlet pipe for discharging the wastewater after heat exchange to the filter box are provided. A second inlet pipe for tap water to enter the hot water pipe and a second outlet pipe for discharging the water after heat exchange are also provided. The second inlet pipe and the second outlet pipe are respectively connected to the two ends of the hot water pipe. A filter element is installed inside the first inlet pipe, and a cleaning mechanism is provided inside the heat exchange box for cleaning sediment on the hot water pipe. This application has the beneficial effect of improving the heat exchange efficiency between the water in the hot water pipe and the dyeing and printing wastewater.

Description

Technical Field

[0001] This application relates to the technical field of wastewater utilization, and in particular to equipment for recycling dyeing and printing cooling wastewater. Background Technology

[0002] High-temperature and high-pressure overflow dyeing machines commonly used by printing and dyeing enterprises have high water consumption, high steam consumption, and generally low energy efficiency. Therefore, it is necessary to make full use of the waste heat of the dyeing machine to improve energy efficiency.

[0003] It is known that the temperature of fabric in the dyeing machine is relatively high. After the fabric is dyed, the water in the dyeing machine needs to be cooled down before sodium thiosulfate is used for reduction. The reduction temperature of sodium thiosulfate varies depending on the dye. The specific temperature to be cooled down will depend on the type of dye and the characteristics of the fiber. However, it is generally common practice to lower the temperature to 65-75°C before adding sodium thiosulfate.

[0004] When cooling the water in a dyeing machine, heat exchange tubes are usually installed around the outer wall of the dyeing drum. Cooler water is passed through these tubes to exchange heat with the water in the drum, lowering its temperature to 65-75°C. Then, sodium thiosulfate is added to restore the dye color. Finally, the dyeing wastewater is discharged. The water in the heat exchange tubes, which absorbs heat, is relatively warm and clean, and can be directly passed to other dyeing machines to dye other fabrics, thus recycling the cooling water.

[0005] For the dyeing and printing wastewater undergoing cooling, since its temperature is between 65-75°C, directly discharging it into the wastewater equalization tank would reduce the efficiency of biochemical treatment and waste energy. Therefore, to reduce energy waste, existing technologies include waste heat recovery devices to recover heat from the wastewater. Specifically, the wastewater is transported to a water tank through a water pipe, where a heat exchange pipe is installed to exchange heat with the high-temperature wastewater. Since room-temperature tap water is circulated through this heat exchange pipe to absorb the heat from the high-temperature wastewater, the wastewater after heat exchange is discharged from the outlet pipe to wastewater treatment equipment for treatment to form greywater, which is then recycled for other uses. The heat-exchanged tap water is then used in other equipment that requires water.

[0006] However, since the dyeing and printing wastewater contains a large amount of lint and some dye precipitates, these impurities and precipitates tend to settle on the outer wall of the hot water exchange pipe, forming a thick layer on the outer wall of the hot water exchange pipe, which in turn affects the heat exchange effect between the water in the hot water exchange pipe and the dyeing and printing wastewater. Therefore, further improvements are needed. Summary of the Invention

[0007] In order to improve the heat exchange effect between the water in the hot water exchange pipe and the dyeing and printing wastewater, this application provides a dyeing and printing cooling wastewater recycling device.

[0008] The wastewater recycling equipment for dyeing and printing cooling provided in this application adopts the following technical solution: A wastewater recycling device for dyeing and printing cooling includes a heat exchange box for exchanging heat with dyeing and printing wastewater and a filter box for purifying and filtering the wastewater after heat exchange. The heat exchange box contains a hot water pipe for heat exchange. The heat exchange box is connected to a first inlet pipe for wastewater to enter and a first outlet pipe for discharging the wastewater after heat exchange to the filter box. The heat exchange box is also connected to a second inlet pipe for tap water to enter the hot water pipe and a second outlet pipe for discharging the water after heat exchange. The second inlet pipe and the second outlet pipe are respectively connected to the two ends of the hot water pipe. A filter element is installed in the first inlet pipe. The heat exchange box is equipped with a cleaning mechanism for cleaning sediment on the hot water pipe. The cleaning mechanism includes a first cleaning component for cleaning sediment outside the hot water pipe and a second cleaning component for cleaning sediment inside the hot water pipe.

[0009] By adopting the above technical solution, before the dyeing wastewater from the dyeing machine enters the heat exchange box through the first inlet pipe, it first passes through a filter installed in the first inlet pipe to pre-filter some larger substances in the dyeing wastewater, thereby reducing the accumulation of sediment in the heat exchange box and the outer wall of the hot water exchange pipe, thus improving the heat exchange effect between the water in the hot water exchange pipe and the dyeing wastewater. Then, while the pre-filtered dyeing wastewater enters the heat exchange box through the first inlet pipe, water is circulated into the hot water exchange pipe through the second inlet pipe. By immersing the hot water exchange pipe in the dyeing wastewater, heat exchange is carried out. The dyeing wastewater after heat exchange is discharged into the filter box through the first outlet pipe for purification and filtration, and then recycled for other uses. Meanwhile, the water used for heat exchange in the hot water exchange pipe is circulated into other equipment that requires hot water through the second outlet pipe.

[0010] Since the hot water exchanger pipes are immersed in dyeing and printing wastewater for heat exchange, sediment adheres to the outer wall of the pipes. While the wastewater is still in the heat exchange tank, the first cleaning component cleans the sediment from the outer wall of the pipes, reducing sediment buildup and improving the heat exchange efficiency between the water and the wastewater. Furthermore, as the water in the pipes heats up, some sediment precipitates and adheres to the inner wall, also affecting the heat exchange efficiency. Therefore, the second cleaning component cleans the sediment from the inner wall of the pipes, further reducing sediment buildup and improving the heat exchange efficiency between the water and the wastewater.

[0011] Preferably, the hot water exchange pipe is arranged in the shape of a mosquito coil, and the first cleaning component includes a cleaning ring sleeved on the hot water exchange pipe, a first cleaning scraper ring coaxially arranged on the inner peripheral wall of the cleaning ring, and a driving component for driving the cleaning ring to slide along the pipe direction of the hot water exchange pipe.

[0012] By adopting the above technical solution, the hot water exchange pipe is set in the shape of a mosquito coil, which makes it easy to start the drive component to drive the cleaning ring to slide along the pipe direction of the hot water exchange pipe. This drives the first cleaning scraper ring to scrape off the sediment on the outer wall of the hot water exchange pipe, so that the scraped sediment will then enter the filter box for purification and filtration.

[0013] Preferably, the driving component includes a drive motor disposed outside the heat exchange box and a rotating shaft disposed inside the heat exchange box and coaxially fixedly connected to the drive motor. The first cleaning assembly further includes a mounting part for connecting the cleaning ring and the rotating shaft. The mounting part includes a support rod disposed on the rotating shaft and a mounting rod disposed on the support rod. The support rod is disposed above the hot water pipe. A first sliding groove is formed on the surface of the support rod near the hot water pipe along its length direction. The upper part of the mounting rod is slidably connected to the first sliding groove, and the lower part of the mounting rod is disposed on the cleaning ring.

[0014] By adopting the above technical solution, the drive motor is started to drive the rotation of the rotating shaft, which in turn drives the support rod to rotate around the axis of the rotating shaft. Since the hot water exchange pipe is set in the shape of a mosquito coil, the curvature of each turn is changed. At this time, by opening a first sliding groove on the support rod for sliding connection, the cleaning ring connected to the installation rod can be driven to slide according to the pipe direction of the hot water exchange pipe, thereby cleaning the outer peripheral wall of the hot water exchange pipe, reducing the sediment on the outer peripheral wall of the hot water exchange pipe, and thus improving the heat exchange effect between the water and the dyeing wastewater in the hot water exchange pipe.

[0015] Preferably, the second cleaning component includes an inner cleaning tube built into the hot water exchange pipe and a second cleaning scraper ring coaxially sleeved on the outer peripheral wall of the inner cleaning tube. The second cleaning scraper ring abuts against the inner peripheral wall of the hot water exchange pipe, and the inner cleaning tube is magnetically connected to the cleaning ring. The hot water exchange pipe is made of copper.

[0016] By adopting the above technical solution, when the first cleaning scraper ring cleans the outer peripheral wall of the hot water exchange pipe by activating the driving component, the cleaning inner tube is magnetically connected to the cleaning ring and can slide along the pipe direction of the hot water exchange pipe together with the cleaning ring as it slides along the pipe direction. This allows the second cleaning scraper ring set on the cleaning inner tube to clean the inner peripheral wall of the hot water exchange pipe, thereby improving the heat exchange effect between the water and the dyeing wastewater in the hot water exchange pipe.

[0017] Preferably, the length of the cleaning inner tube is greater than the inner diameter of the hot water exchange pipe, the cleaning inner tube is arc-shaped along its length, and the outer peripheral wall of the cleaning inner tube is provided with a deformation groove along its axis. Several deformation grooves are provided and spaced apart along the length of the cleaning inner tube. The cross-section of the deformation groove along its axis is arc-shaped. The outer peripheral wall of the cleaning inner tube away from the deformation groove is provided with an avoidance groove symmetrically arranged with the deformation groove. Several second cleaning scraper rings are provided and coaxially sleeved on the cleaning inner tube.

[0018] By adopting the above technical solution, since the cleaning inner tube is built into the hot water exchange pipe and the cleaning inner tube is magnetically connected to the cleaning ring, if the length of the cleaning inner tube is less than the inner diameter of the hot water exchange pipe, when water enters the hot water exchange pipe, the cleaning inner tube, which was originally set coaxially with the hot water exchange pipe, may be deflected by the water flow, making it difficult for the cleaning inner tube to be set coaxially with the hot water exchange pipe. Therefore, by making the length of the cleaning inner tube greater than the inner diameter of the hot water exchange pipe, the possibility of the cleaning inner tube being deflected by the water flow is reduced. Furthermore, since the length of the cleaning inner pipe is greater than the inner diameter of the hot water exchange pipe, the curvature of the hot water exchange pipe changes as the cleaning inner pipe slides along the pipe's direction. To facilitate the sliding of the cleaning inner pipe along the hot water exchange pipe's direction, a deformation groove is formed on the outer peripheral wall of the cleaning inner pipe along its axis, and a clearance groove is formed on the outer peripheral wall of the cleaning inner pipe away from the deformation groove, which is symmetrically arranged with the deformation groove. This allows the cleaning inner pipe to change with the curvature of the hot water exchange pipe during the sliding process, thereby cleaning the inner peripheral wall of the hot water exchange pipe located in the inner circle.

[0019] Preferably, the heat exchange box has internal partitions, and several partitions are arranged along the height of the heat exchange box to divide the interior of the heat exchange box into several heat exchange chambers. Each heat exchange chamber has a heat exchange water pipe. The partitions have through holes to connect adjacent heat exchange chambers, and the partitions are provided with opening and closing devices for opening and closing the through holes. Adjacent heat exchange water pipes are connected by connecting parts. The first water inlet pipe and the second water outlet pipe are both located in the upper part of the heat exchange box, and the first water outlet pipe and the second water inlet pipe are both located in the lower part of the heat exchange box.

[0020] By adopting the above technical solution, and by setting up partitions to divide the interior of the heat exchange chamber into several heat exchange chambers, each of which is equipped with a hot water exchange pipe, and because the first inlet pipe and the second outlet pipe are both located at the top of the heat exchange chamber, while the first outlet pipe and the second inlet pipe are located at the bottom, the dyeing and printing wastewater can enter the upper heat exchange chamber from the top of the heat exchange chamber and exchange heat with the hot water exchange pipes in the heat exchange chamber first. After a certain period of heat exchange, the heat exchange between the water in the hot water exchange pipes and the dyeing and printing wastewater in the heat exchange chamber reaches its maximum. The temperature reaches a certain constant value; however, compared to the initial temperature of the water in the hot water exchange pipe, the temperature of the dyeing wastewater is still relatively high. At this point, the opening and closing device on the partition is activated to open the through hole, thereby allowing the dyeing wastewater to flow into the next heat exchange chamber to exchange heat with the hot water exchange pipe in the heat exchange chamber, so as to reabsorb the heat in the dyeing wastewater and reduce the heat loss in the dyeing wastewater; and since the water temperature in the hot water exchange pipe gradually increases from bottom to top, it can reduce the heat loss caused by excessive temperature difference during heat exchange.

[0021] Therefore, by segmenting the heat exchange, the heat exchange effect between the water in the hot water pipe and the dyeing wastewater can be improved.

[0022] Preferably, the middle part of the hot water exchange pipe has a through groove for the rotating shaft to pass through, and the rotating shaft extends above the lowermost hot water exchange pipe. The connecting part includes a first connecting pipe connected to the innermost end of the hot water exchange pipe, a second connecting pipe disposed in the first connecting pipe, and a third connecting pipe disposed in the second connecting pipe. The length direction of the first connecting pipe is parallel to the length direction of the rotating shaft, the length direction of the second connecting pipe is perpendicular to the length direction of the first connecting pipe, and the third connecting pipe is parallel to the length direction of the first connecting pipe. A cavity is left between the second connecting pipe and the third connecting pipe for the mounting part to be placed. The length of the support rod is less than the distance between the rotating shaft and the third connecting pipe.

[0023] By adopting the above technical solution, since there are several hot water exchange pipes, there are corresponding cleaning rings and cleaning inner pipes. In order to enable the several mounting parts set on the rotating shaft to rotate smoothly around the axial direction of the rotating shaft, that is, to drive the cleaning rings on the several hot water exchange pipes to clean them, by leaving a cavity between the second connecting pipe and the third connecting pipe for the mounting parts to be placed, and by making the length of the support rod less than the distance between the rotating shaft and the third connecting pipe, the possibility of the support rod being obstructed by the connecting parts during rotation can be reduced. In addition, it is convenient to set a drive motor to drive the rotation of several mounting parts, thereby cleaning multiple hot water exchange pipes, reducing the possibility of needing to set several drive sources according to the number of hot water exchange pipes.

[0024] Preferably, the opening and closing element is a sealing sleeve coaxially sleeved outside the rotating shaft. The outer peripheral wall of the sealing sleeve abuts against the inner peripheral wall of the through hole. A flow groove communicating with the through hole is formed around the middle of the sealing sleeve along its own axis. The diameter of the flow groove gradually decreases from the middle to both ends of the sealing sleeve, so that the middle of the sealing sleeve is waist-shaped. A sliding strip is provided protruding from the outer peripheral wall of the sealing sleeve. A second sliding groove for sliding the sliding strip is formed on the inner peripheral wall of the partition located in the through hole. The second sliding groove extends to the two opposite surfaces of the partition. A threaded section for threaded connection of the sealing sleeve is formed on the outer peripheral wall of the rotating shaft. A limiting block abutting against the partition is provided at both ends of the sealing sleeve. The number of sealing sleeves is the same as the number of partitions. The length of the sealing sleeve gradually decreases from top to bottom.

[0025] By adopting the above technical solution, since several heat exchange chambers are set up, in order to prevent the dyeing and printing wastewater in the heat exchange chambers from being interconnected and thus to reduce the heat loss in the dyeing and printing wastewater, it is necessary that when the dyeing and printing wastewater in the previous heat exchange chamber flows into the current heat exchange chamber, the dyeing and printing wastewater in the current heat exchange chamber has already flowed into the next heat exchange chamber.

[0026] The specific operation is as follows: First, the dyeing wastewater in the lowest heat exchange chamber is discharged. When the cleaning ring is at the outermost ring of the hot water pipe, the drive motor rotates forward to move the cleaning ring along the pipe direction of the hot water pipe, thereby moving the cleaning ring towards the inner ring of the hot water pipe. At this time, the upper part of the sealing sleeve at the bottom slides upward along the second sliding groove as the sliding strip rotates with the rotating shaft. When it slides to the point where the flow groove in the middle connects with the through hole on the partition, the dyeing wastewater in the previous heat exchange chamber flows into the current heat exchange chamber. After the flow is completed, as the rotating shaft continues to rotate forward, because the flow groove is waist-shaped, the sealing sleeve gradually rises until the lower part of the sealing sleeve abuts against the through hole. Because the sealing sleeve is equipped with a limit block, it can be restricted from continuing to rise with the rotation of the sleeve, thereby continuing to seal the through hole on the lowest partition, and temporarily sealing the dyeing wastewater flowing from the previous heat exchange chamber into the current heat exchange chamber.

[0027] Because the length of several sealing sleeves gradually decreases from top to bottom, the through holes on each partition are opened and closed separately to reduce the possibility of simultaneous opening and closing. This ensures that the dyeing wastewater in the current heat exchange chamber flows into the next heat exchange chamber before the dyeing wastewater in the previous heat exchange chamber flows into the current heat exchange chamber. This reduces the possibility of heat exchange between dyeing wastewater in adjacent heat exchange chambers, thereby reducing heat loss and improving the heat exchange effect of dyeing wastewater.

[0028] Preferably, the inner diameter of the hot water exchange pipe is larger than the inner diameter of the second outlet pipe and larger than the inner diameter of the first connecting pipe.

[0029] By adopting the above technical solution, since the cleaning inner tube and the cleaning ring are magnetically connected, the cleaning inner tube may detach due to the impact of water flow. After detachment, in order to reduce the flow of the cleaning inner tube into the first or third connecting pipe, the inner diameter of the hot water exchange pipe is made larger than the inner diameter of the second outlet pipe and larger than the inner diameter of the first connecting pipe. Since the second cleaning scraper ring abuts against the inner circumferential wall of the hot water exchange pipe, the outer diameter of the second cleaning scraper ring is larger than the inner diameter of the first connecting pipe and larger than the inner diameter of the third connecting pipe, which can reduce the magnetic attraction effect between the cleaning inner ring and the cleaning ring.

[0030] Preferably, a plurality of cleaning rings are provided and spaced apart along the length of the support rod, and the number of cleaning inner tubes is the same as the number of cleaning rings.

[0031] By adopting the above technical solution, and by setting up several cleaning rings, multiple turns of the hot water pipe can be cleaned when the drive motor rotates once, thereby speeding up the cleaning rate and reducing the number of rotations of the rotating shaft.

[0032] In summary, the present invention has the following beneficial effects: 1. By installing a filter element in the first inlet pipe, the dyeing and printing wastewater can be preliminarily filtered before flowing into the heat exchange box to reduce the accumulation of sediment in the heat exchange box. Furthermore, by installing a first cleaning component and a second cleaning component, the sediment on the outer and inner walls of the hot water exchange pipe can be cleaned respectively to reduce the deposition of sediment on the outer and inner walls of the hot water exchange pipe, thereby improving the heat exchange effect between the water in the hot water exchange pipe and the dyeing and printing wastewater.

[0033] 2. By setting up partitions to divide the interior of the heat exchange chamber into several heat exchange chambers and setting up opening and closing devices, the dyeing and printing wastewater can be heat exchanged in sections, thereby improving the heat exchange effect between the water in the heat exchange pipe and the dyeing and printing wastewater. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the internal structure of the heat exchange box in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the filter element in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the internal structure of the hot water exchange pipe in Embodiment 1 of this application; Figure 5 yes Figure 4 A magnified schematic diagram of the structure located at point A; Figure 6This is a schematic diagram of the rotating shaft and the hot water exchange pipe in Embodiment 1 of this application; Figure 7 This is a schematic diagram of the structure of the second cleaning component in Embodiment 1 of this application; Figure 8 This is a schematic diagram of the structure of the hot water exchange pipe and the second outlet pipe in Embodiment 1 of this application; Figure 9 This is a schematic diagram of the structure of the hot water exchange pipe and the first connecting pipe in Embodiment 1 of this application; Figure 10 This is a schematic diagram of the state structure of the sealing sleeve in Embodiment 1 of this application; Figure 11 This is a partial structural diagram of the heat exchange box in Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Dyeing machine; 11. Drain pipe; 2. Heat exchange box; 21. First inlet pipe; 211. Filter element; 212. Mounting groove; 213. Cover plate; 22. First outlet pipe; 23. Second inlet pipe; 24. Second outlet pipe; 25. Partition plate; 251. Through hole; 252. Second chute; 26. Heat exchange chamber; 3. Filter box; 4. Hot water pipe; 41. Connecting part; 411. First connecting pipe; 412. Second connecting pipe; 413. Third connecting pipe; 42. Through groove; 5. Control valve; 6. Mounting block; 61 7. Bolt; 8. Cleaning mechanism; 9. First cleaning assembly; 10. Cleaning ring; 11. First cleaning scraper ring; 12. Driving component; 13. Drive motor; 14. Rotating shaft; 15. Threaded section; 16. Mounting part; 17. Support rod; 18. First slide groove; 19. Mounting rod; 20. Second cleaning assembly; 11. Cleaning inner tube; 12. Deformation groove; 13. Clearance groove; 14. Separating section; 15. Second cleaning scraper ring; 16. Sealing sleeve; 17. Flow groove; 18. Sliding strip; 19. Limiting block. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail below.

[0037] This application discloses a device for recycling dyeing and printing cooling wastewater.

[0038] Example 1: Wastewater recycling equipment for dyeing and printing cooling, refer to Figure 1 , Figure 2The system includes a heat exchange box 2 for exchanging heat with the dyeing wastewater in the dyeing machine 1, and a filter box 3 for purifying and filtering the dyeing wastewater after heat exchange. The heat exchange box 2 contains a hot water pipe 4. A first inlet pipe 21 is fixedly installed through the upper side wall of the heat exchange box 2, and a first outlet pipe 22 is fixedly installed through the lower side wall of the heat exchange box 2. In this embodiment, both the first inlet pipe 21 and the first outlet pipe 22 are equipped with control valves 5. The heat exchange box 2 is also equipped with a second inlet pipe 23 for supplying tap water into the hot water pipe 4 and a second outlet pipe 24 for discharging the water after heat exchange. The second inlet pipe 23 and the second outlet pipe 24 are respectively connected to the two ends of the hot water pipe 4. In this embodiment, the second inlet pipe 23 and the second outlet pipe 24 are also equipped with control valves 5.

[0039] It should be noted that the first inlet pipe 21 is connected to the drain pipe 11 on the dyeing machine 1 to allow the dyeing wastewater, which has been cooled to 65-75°C in the dyeing machine 1, to enter the heat exchange box 2. At this time, the second inlet pipe 23 introduces tap water into the heat exchange pipe 4. After heat exchange with the heat exchange pipe 4, the tap water is output through the second outlet pipe 24 and supplied to other equipment that requires water. The dyeing wastewater after heat exchange is discharged into the filter box 3 through the first outlet pipe 22 for purification and filtration. After filtration, it can be used as other water. In this embodiment, since the specific structure of the filter box 3 is a conventional design, it will not be described in detail here.

[0040] Specifically, in this embodiment, the hot water exchange pipe 4 is made of copper and is arranged in the shape of a mosquito coil. Several hot water exchange pipes 4 are arranged and distributed at intervals along the height direction of the heat exchange box 2. The second water inlet pipe 23 is arranged on the lower side wall of the heat exchange box 2 and is connected to the water inlet end of the innermost ring of the lowermost hot water exchange pipe 4. The second water outlet pipe 24 is arranged on the upper side wall of the heat exchange box 2 and is connected to the water outlet end of the outermost ring of the uppermost hot water exchange pipe 4.

[0041] It should be noted that adjacent hot water exchange pipes 4 are connected by a connecting part 41, which includes a first connecting pipe 411, a second connecting pipe 412, and a third connecting pipe 413. In this embodiment, the length directions of the first connecting pipe 411 and the third connecting pipe 413 are parallel to the height direction of the filter box 3, and the length direction of the second connecting pipe 412 is perpendicular to the length direction of the first connecting pipe 411. Specifically, the first connecting pipe 411 is connected to the water inlet end of the innermost ring of the hot water exchange pipe 4, the second connecting pipe 412 is connected to the first connecting pipe 411, the third connecting pipe 413 is connected to the second connecting pipe 412, and the third connecting pipe 413 is connected to the water outlet end of the outer ring of the hot water exchange pipe 4.

[0042] Reference Figure 3Furthermore, to reduce the entry of larger substances from the dyeing and printing wastewater into the heat exchanger 2, a filter element 211 is installed inside the first inlet pipe 21. This filter element 211 is a filter plate, which is detachably connected to the first inlet pipe 21. Specifically, an installation groove 212 is formed on the outer peripheral wall of the first inlet pipe 21. A cover plate 213, which opens and closes the installation groove 212, is fixedly connected to the filter plate. Both the cover plate 213 and the outer peripheral wall of the first inlet pipe 21 are fixedly connected to mounting blocks 6, which are threaded with bolts 61. This allows the cover plate 213 to be closed onto the installation groove 212, thus achieving a detachable connection of the filter plate. The filter plate performs preliminary filtration of larger substances in the dyeing and printing wastewater, reducing the accumulation of sediment in the heat exchanger 2.

[0043] Reference Figure 2 , Figure 4 Furthermore, in order to reduce the accumulation of sediment on the hot water exchange pipe 4, a cleaning mechanism 7 is provided in the heat exchange box 2 for cleaning the sediment on the hot water exchange pipe 4. The cleaning mechanism 7 includes a first cleaning component 8 for cleaning sediment outside the hot water exchange pipe 4 and a second cleaning component 9 for cleaning sediment inside the hot water exchange pipe 4.

[0044] Reference Figure 4 , Figure 5 The first cleaning component 8 includes a cleaning ring 81, a first cleaning scraper ring 82, a driving member 83, and a mounting part 84. The cleaning ring 81 is coaxially sleeved on the outer peripheral wall of the hot water exchange pipe 4. The outer peripheral wall of the first cleaning scraper ring 82 is fixedly connected to the inner peripheral wall of the cleaning ring 81. The inner peripheral wall of the first cleaning scraper ring abuts against the outer peripheral wall of the hot water exchange pipe 4. The driving member 83 drives the cleaning ring 81 to slide along the pipe direction of the hot water exchange pipe 4. The mounting part 84 is used to install the cleaning ring 81 and the driving member 83. In this embodiment, the first cleaning scraper ring 82 is made of silicone, possessing a certain degree of elasticity and softness.

[0045] Specifically, the driving component 83 includes a drive motor 831 and a rotating shaft 832. The drive motor 831 is fixedly connected to the top outer wall of the heat exchange box 2. The output shaft of the drive motor 831 is rotatably inserted through the top of the heat exchange box 2. The rotating shaft 832 is built into the heat exchange box 2. The upper end of the rotating shaft 832 is coaxially fixedly connected to the output shaft of the drive motor 831.

[0046] The mounting part 84 is used to install the cleaning ring 81 to the rotating shaft 832. The mounting part 84 includes a support rod 841 and a mounting rod 842. In this embodiment, the length direction of the support rod 841 is perpendicular to the length direction of the rotating shaft 832, and the mounting rod 842 is arranged in an L-shape. One end of the support rod 841 is fixedly connected to the outer peripheral wall of the rotating shaft 832. The support rod 841 is located above the hot water exchange pipe 4. A first sliding groove 8411 is formed on the surface of the support rod 841 near the hot water exchange pipe 4 along its length direction. The upper part of the mounting rod 842 is slidably connected to the first sliding groove 8411, and the lower part of the mounting rod 842 is fixedly connected to the outer peripheral wall of the cleaning ring 81.

[0047] It should be noted that the middle of the hot water pipe 4 has a through groove 42 for the rotating shaft 832 to pass through, such as... Figure 4 As shown, the rotating shaft 832 extends above the lowermost hot water exchange pipe 4, and a cavity is left between the second connecting pipe 412 and the third connecting pipe for the installation part 84 to be placed. The length of the support rod 841 is less than the distance between the rotating shaft 832 and the third connecting pipe 413. Figure 6 As shown.

[0048] Reference Figure 5 , Figure 7 Specifically, the second cleaning component 9 includes a cleaning inner tube 91 and a second cleaning scraper ring 92. The cleaning inner tube 91 is built into the hot water exchange pipe 4. In this embodiment, the cleaning inner tube 91 is arranged in an arc shape along its length and is magnetically attracted to the cleaning ring 81. The inner peripheral wall of the second cleaning scraper ring 92 is coaxially sleeved on the outer peripheral wall of the cleaning inner tube 91, and the outer peripheral wall of the second cleaning scraper ring 92 abuts against the inner peripheral wall of the hot water exchange pipe 4. In this embodiment, the second cleaning scraper ring 92 is made of the same material as the first cleaning scraper ring 82. In this embodiment, the length of the cleaning inner tube 91 is greater than the inner diameter of the hot water exchange pipe 4, and the outer peripheral wall of the cleaning inner tube 91 is provided with a deformation groove 911 along its axis. Several deformation grooves 911 are provided and are spaced apart along the length direction of the cleaning inner tube 91. In this embodiment, the cross-section of the deformation groove 911 along its axis is arc-shaped. The outer peripheral wall of the cleaning inner tube 91 away from the deformation groove 911 is provided with a relief groove 912 symmetrically arranged with the deformation groove 911, so that the cleaning inner tube 91 can change with the curvature of the hot water exchange pipe 4.

[0049] It should be noted that, because the deformation groove 911 and the clearance groove 912 are designed to divide the inner cleaning pipe 91 into several connected partition sections 913, the second cleaning scraper ring 92 is provided in several units and is respectively fitted onto several partition sections 913. The inner diameter of the hot water exchange pipe 4 is larger than the inner diameter of the second outlet pipe 24 and larger than the inner diameter of the first connecting pipe 411. Since the second cleaning scraper ring 92 abuts against the inner circumferential wall of the hot water exchange pipe 4, the corresponding outer diameter of the second cleaning scraper ring 92 is smaller than the inner diameter of the first connecting pipe 411 and larger than the inner diameter of the second outlet pipe 24. Figure 8 , Figure 9 As shown.

[0050] It should be noted that the specific operation for placing the cleaning inner pipe 91 into the hot water exchange pipe 4 is as follows: first, place the cleaning inner pipe 91 into the hot water exchange pipe 4 through the water outlet end located on the outer ring of the hot water exchange pipe 4. Then, connect the second water outlet pipe 24 or the third connecting pipe 413 in a detachable manner by welding or by using a connector. Since the specific structure of the connector is a conventional design, it will not be elaborated in detail here.

[0051] Reference Figure 2 , Figure 4 Furthermore, the heat exchange box 2 is provided with partitions 25, and several partitions 25 are provided at intervals along the height direction of the heat exchange box 2, so that the interior of the heat exchange box 2 is divided into several heat exchange chambers 26. In this embodiment, the cross-section of the partition 25 is V-shaped, and a through hole 251 is provided in the middle of the partition 25 to connect adjacent heat exchange chambers 26. In this embodiment, there are two partitions 25, so that the interior of the heat exchange box 2 is divided into three heat exchange chambers 26. Each of the three heat exchange chambers 26 contains a heat exchange water pipe 4. Several heat exchange water pipes 4 can be provided in one heat exchange chamber 26. In this embodiment, there are two heat exchange water pipes 4 in one heat exchange chamber 26, and the two heat exchange water pipes 4 are distributed at intervals along the height direction of the heat exchange chamber 26. It should be noted that the rotating shaft 832 passes through the through hole 251, and the first connecting pipe 411 passes through the partition 25.

[0052] Reference Figure 2 , Figure 4 The partition 25 is provided with an opening and closing element for opening and closing the through hole 251. The opening and closing element is a sealing sleeve 10. In this embodiment, the sealing sleeve 10 is made of silicone, and the number of sealing sleeves 10 is the same as the number of partitions 25. A flow groove 101 is opened in the middle of the sealing sleeve 10 around its own axis. The flow groove 101 is connected to the through hole 251. The diameter of the flow groove 101 gradually decreases from the middle to both ends of the sealing sleeve 10, so that the middle of the sealing sleeve 10 is waist-shaped. It should be noted that the length of the flow groove 101 in the height direction is longer than the thickness of the through hole 251.

[0053] Furthermore, the sealing sleeve 10 is coaxially sleeved on the outer peripheral wall of the rotating shaft 832. The rotating shaft 832 has a threaded section 8321 on the outer peripheral wall of the through hole 251 for threaded connection of the sealing sleeve 10. The outer peripheral wall of the sealing sleeve 10 is provided with a sliding strip 102. The partition 25 has a second sliding groove 252 on the inner peripheral wall of the through hole 251 for sliding of the sliding strip 102. The second sliding groove 252 extends to the two opposite surfaces of the partition 25. Both ends of the sealing sleeve 10 are provided with a limiting block that abuts against the partition 25.

[0054] The implementation principle of the dyeing and printing wastewater recycling equipment in this application embodiment is as follows: First, the dyeing and printing wastewater in the dyeing machine 1 enters the heat exchange box 2 through the first inlet pipe 21. The filter plate installed in the first inlet pipe 21 performs preliminary filtration of some larger substances in the dyeing and printing wastewater. Before entering, water is first circulated into the heat exchange water pipe 4 through the second inlet pipe 23. By immersing the heat exchange water pipe 4 in the dyeing and printing wastewater, heat exchange is carried out. When it is necessary to circulate the dyeing and printing wastewater in the previous heat exchange chamber 26 to the next heat exchange chamber 26, the forward rotation of the drive motor 831 drives the cleaning ring 81 to move along the pipe direction of the heat exchange water pipe 4, thereby driving the cleaning ring 81 to move towards the inner ring of the heat exchange water pipe 4. At this time, the upper part of the sealing sleeve 10 located at the bottom slides upward along the first sliding groove 8411 with the rotation of the rotating shaft 832 along the sliding strip 102. When it slides to the point that the flow groove 101 located in the middle is connected to the through hole 251 on the partition plate 25, as Figure 10 As shown, this allows the dyeing wastewater from the previous heat exchange chamber 26 to flow into the current heat exchange chamber 26. After the flow is complete, as the rotating shaft 832 continues to rotate in the forward direction, the flow channel 101 is waist-shaped. As the sealing sleeve 10 gradually rises, the lower part of the sealing sleeve 10 abuts against the through hole 251. Since the sealing sleeve 10 is provided with a limit block 103, it can be restricted from continuing to rise with the rotation of the rotating sleeve, thereby continuing to seal the through hole 251 on the lowermost partition 25, so as to temporarily seal the dyeing wastewater flowing from the previous heat exchange chamber 26 into the current heat exchange chamber 26. When the dyeing wastewater in the heat exchange chamber 26 is replaced, the water in the hot water exchange pipe 4 also flows, and the water from the next hot water exchange pipe 4 flows into the previous hot water exchange pipe 4, thereby increasing the heat exchange efficiency of the hot water exchange pipe 4.

[0055] During the forward rotation of the drive motor 831, while replacing the dyeing wastewater in the heat exchange chamber 26, the cleaning ring 81 also cleans the outer peripheral wall of the hot water exchange pipe 4, and the cleaning inner pipe 91 located in the hot water exchange pipe 4 cleans the inner peripheral wall of the hot water exchange pipe 4. This cleans the sediment on the outer and inner peripheral walls of the hot water exchange pipe 4, thereby improving the heat exchange effect between the water and the dyeing wastewater in the hot water exchange pipe 4.

[0056] Example 2: Reference Figure 11 The difference from Embodiment 1 is that several cleaning rings 81 are provided and spaced apart along the length of the support rod 841. The number of cleaning inner tubes 91 is the same as the number of cleaning rings 81. In this embodiment, two cleaning rings 81 are specifically provided on one support rod 841. By providing several cleaning rings 81, multiple turns of the hot water pipe 4 can be cleaned when the drive motor 831 rotates once, thereby speeding up the cleaning rate and reducing the number of rotations of the rotating shaft 832.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater recycling system for dyeing and printing cooling, characterized in that: The system includes a heat exchange box (2) for exchanging heat with dyeing and printing wastewater and a filter box (3) for purifying and filtering the dyeing and printing wastewater after heat exchange. The heat exchange box (2) has a built-in hot water pipe (4). The heat exchange box (2) is provided with a first inlet pipe (21) for wastewater to enter and a first outlet pipe (22) for discharging the dyeing and printing wastewater after heat exchange to the filter box (3). The heat exchange box (2) is also provided with a second inlet pipe (23) for tap water to enter the hot water pipe (4) and a second outlet pipe (24) for discharging the water after heat exchange. The second inlet pipe (23) and the second outlet pipe (24) are respectively connected to the two ends of the heat exchange pipe (4); a filter element (211) is provided in the first inlet pipe (21), and a cleaning mechanism (7) for cleaning the sediment on the heat exchange pipe (4) is provided in the heat exchange box (2). The cleaning mechanism (7) includes a first cleaning component (8) for cleaning the sediment outside the heat exchange pipe (4) and a second cleaning component (9) for cleaning the sediment inside the heat exchange pipe (4). The hot water exchange pipe (4) is arranged in the shape of a mosquito coil. The first cleaning component (8) includes a cleaning ring (81) sleeved on the hot water exchange pipe (4), a first cleaning scraper ring (82) coaxially arranged on the inner peripheral wall of the cleaning ring (81), and a driving component (83) that drives the cleaning ring (81) to slide along the pipe direction of the hot water exchange pipe (4). The driving component (83) includes a drive motor (831) disposed outside the heat exchange box (2) and a rotating shaft (832) disposed inside the heat exchange box (2) and coaxially fixedly connected to the drive motor (831). The first cleaning component (8) also includes an installation part (84) for connecting the cleaning ring (81) and the rotating shaft (832). The installation part (84) includes a support rod (841) disposed on the rotating shaft (832) and an installation rod (842) disposed on the support rod (841). The support rod (841) is disposed above the hot water pipe (4). A first groove (8411) is opened on the surface of the support rod (841) near the hot water pipe (4) along its length direction. The upper part of the installation rod (842) is slidably connected to the first groove (8411), and the lower part of the installation rod (842) is disposed on the cleaning ring (81). The second cleaning component (9) includes a cleaning inner tube (91) built into the hot water exchange pipe (4) and a second cleaning scraper (92) coaxially sleeved on the outer peripheral wall of the cleaning inner tube (91). The second cleaning scraper (92) abuts against the inner peripheral wall of the hot water exchange pipe (4). The cleaning inner tube (91) is magnetically connected to the cleaning ring (81). The hot water exchange pipe (4) is made of copper pipe.

2. The wastewater recycling equipment for dyeing and printing cooling as described in claim 1, characterized in that: The length of the cleaning inner tube (91) is greater than the inner diameter of the hot water exchange pipe (4). The cleaning inner tube (91) is arc-shaped along its length direction, and the outer peripheral wall of the cleaning inner tube (91) is provided with a deformation groove (911) along its axis. There are several deformation grooves (911) and they are spaced apart along the length direction of the cleaning inner tube (91). The cross-section of the deformation groove (911) along its axis direction is arc-shaped. The outer peripheral wall of the cleaning inner tube (91) away from the deformation groove (911) is provided with a relief groove (912) symmetrically arranged with the deformation groove (911). There are several second cleaning scraper rings (92) and they are coaxially sleeved on the cleaning inner tube (91).

3. The wastewater recycling equipment for dyeing and printing cooling as described in claim 1, characterized in that: The heat exchange box (2) has a partition (25) inside. Several partitions (25) are arranged along the height direction of the heat exchange box (2). The partitions (25) divide the interior of the heat exchange box (2) into several heat exchange chambers (26). Each heat exchange chamber (26) has a heat exchange water pipe (4) inside. The partitions (25) have through holes (251) to connect adjacent heat exchange chambers (26). The partitions (25) are provided with opening and closing parts for opening and closing the through holes (251). Adjacent heat exchange water pipes (4) are connected by a connecting part (41). The first water inlet pipe (21) and the second water outlet pipe (24) are both located in the upper part of the heat exchange box (2). The first water outlet pipe (22) and the second water inlet pipe (23) are both located in the lower part of the heat exchange box (2).

4. The wastewater recycling equipment for dyeing and printing cooling as described in claim 3, characterized in that: The middle part of the hot water exchange pipe (4) has a through groove (42) for the rotating shaft (832) to pass through. The rotating shaft (832) extends to the top of the lowest hot water exchange pipe (4). The connecting part (41) includes a first connecting pipe (411) connected to the innermost end of the hot water exchange pipe (4), a second connecting pipe (412) disposed on the first connecting pipe (411), and a third connecting pipe (413) disposed on the second connecting pipe (412). The length direction of the first connecting pipe (411) is parallel to the length direction of the rotating shaft (832). The length direction of the second connecting pipe (412) is perpendicular to the length direction of the first connecting pipe (411). The third connecting pipe (413) is parallel to the length direction of the first connecting pipe (411). A cavity is left between the second connecting pipe (412) and the third connecting pipe for the mounting part (84) to be placed. The length of the support rod (841) is less than the distance between the rotating shaft (832) and the third connecting pipe (413).

5. The wastewater recycling equipment for dyeing and printing cooling as described in claim 4, characterized in that: The opening and closing element is a sealing sleeve (10) coaxially sleeved outside the rotating shaft (832). The outer peripheral wall of the sealing sleeve (10) abuts against the inner peripheral wall of the through hole (251). A flow groove (101) communicating with the through hole (251) is opened in the middle of the sealing sleeve (10) around its own axis. The diameter of the flow groove (101) gradually decreases from the middle to both ends of the sealing sleeve (10), so that the middle of the sealing sleeve (10) is waist-shaped. A sliding strip (102) is provided protruding from the outer peripheral wall of the sealing sleeve (10). The inner peripheral wall of the plate (25) located in the through hole (251) is provided with a second sliding groove (252) for sliding of the sliding strip (102). The second sliding groove (252) extends to the two opposite surfaces of the partition plate (25). The outer peripheral wall of the rotating shaft (832) is provided with a threaded section (8321) for threaded connection of the sealing sleeve (10). Both ends of the sealing sleeve (10) are provided with a limiting block that abuts against the partition plate (25). The number of sealing sleeves (10) is the same as the number of partition plates (25). The length of the sealing sleeve (10) gradually decreases from top to bottom.

6. The wastewater recycling equipment for dyeing and printing cooling as described in claim 5, characterized in that: The inner diameter of the hot water exchange pipe (4) is greater than the inner diameter of the second water outlet pipe (24) and also greater than the inner diameter of the first connecting pipe (411).

7. The wastewater recycling equipment for dyeing and printing cooling as described in claim 1, characterized in that: The cleaning rings (81) are provided in a plurality of numbers and are spaced apart along the length direction of the support rod (841), and the number of the cleaning inner tubes (91) is the same as the number of the cleaning rings (81).

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