Corrosion-resistant detachable mixing device

Abstract

The utility model discloses a kind of corrosion-resistant detachable mixing devices, it is related to mixing device field, including feed pipe, water inlet pipe, mixer shell, discharge pipe and supporting flange, each component is connected through thread, and raw material band sealing is wound at thread portion;Variable-diameter mixing cavity is equipped in the inside of mixer shell, and the diameter of upper end is greater than lower end and is connected by collecting section circular table;Feed pipe inner tube body penetrates mixing cavity, and water inlet pipe lower end port is inclined corresponding inner tube body outer wall;The upper end of discharge pipe is horn shape close, and inlet is consistent with the diameter of mixing cavity bottom, and outlet diameter is larger. All components are made of polytetrafluoroethylene filled graphite material, excellent in strong acid resistance, service life is extended to 2-3 years, and detachable structure facilitates individual replacement of damaged component, reduce maintenance cost, while guarantee that dye and water are mixed evenly, reduce residual and pipeline loss.

Description

Technical Field

[0001] This utility model relates to the field of mixing devices, specifically a corrosion-resistant and detachable mixing device. Background Technology

[0002] In the dye production field, there is a core process requirement in the preparation of acid dyes: the initial concentration of 90% strong acid dye needs to be mixed and diluted with water in a specific ratio to finally obtain a stable concentration of 30% acid dye. The mixing effect of this dilution process and the corrosion resistance of the equipment directly determine the quality stability and production continuity of the subsequent dye products.

[0003] In traditional production scenarios, the industry commonly uses 316L stainless steel to construct mixing equipment to meet basic structural strength and initial corrosion resistance requirements. However, under conditions of long-term contact with 90% strong acid dye stock solution and 30% diluted acid dye, the corrosion resistance of 316L stainless steel has significant shortcomings: the strong acid medium will continuously erode the passivation film on the stainless steel surface, leading to gradual electrochemical corrosion of the metal substrate, manifested as pitting corrosion and rust spots on the inner wall of the equipment. As corrosion intensifies, problems such as thinning of the pipe wall and local perforation may even occur. Utility Model Content

[0004] The purpose of this invention is to provide a corrosion-resistant, detachable mixing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, a corrosion-resistant, detachable mixing device is provided, comprising a feed pipe, a water inlet pipe, a mixer housing, and a discharge pipe. The mixer housing has a mixing chamber inside, and a threaded feed pipe connection port is provided at the upper end of the mixer housing. The feed pipe is screwed into the feed pipe connection port, and a feed pipe flange is screwed into the upper end of the feed pipe. A threaded water inlet pipe connection port is provided on the side of the mixer housing, and the lower end of the water inlet pipe is screwed into the water inlet connection port, and a water pipe flange is screwed into the upper end of the water inlet pipe. A discharge pipe connection port is provided at the bottom of the mixer housing, and a discharge pipe is screwed into the discharge connection port. The inner tube of the lower part of the feed pipe extends into the mixing chamber inside the mixer housing, and the thread in the middle of the feed pipe is screwed onto the feed pipe connection port. The upper part of the feed pipe is the outer tube.

[0006] Furthermore, the mixing chamber in the middle of the mixer housing is a variable-diameter circular cavity, and the diameter of the upper end of the circular cavity is larger than that of the lower end, and the two sets of connections are connected by a tapering frustum.

[0007] Furthermore, an elastic retaining ring groove is provided on the outer side of the upper end of the discharge pipe connection port, and an elastic retaining ring is installed inside the elastic retaining ring groove. One end of the elastic retaining ring is attached to the outer wall of the mixer housing, and the other end restricts the discharge pipe.

[0008] Furthermore, the feed pipe flange and water inlet pipe flange are made of polytetrafluoroethylene-filled graphite plate, with a threaded hole in the middle and bolt fixing holes evenly opened on the outside of the threaded hole. The feed pipe, water inlet pipe and discharge pipe are all made of polytetrafluoroethylene-filled graphite tube, while the mixer shell is made of polytetrafluoroethylene-filled graphite rod, and the threaded connection is connected by wrapping with PTFE tape.

[0009] Furthermore, the upper end of the inner tube of the discharge pipe has a flared constriction structure, and the inlet diameter of the discharge pipe is the same as the bottom diameter of the mixing chamber, while the outlet diameter of the discharge pipe is larger than the inlet diameter.

[0010] Furthermore, the inner tube at the lower end of the feed pipe extends into the mixing chamber, and the lower end of the water inlet pipe is inclined to correspond to the outer wall of the inner tube.

[0011] Compared with existing technologies, the advantages of this utility model are: the components are assembled via threaded connections. When a component is severely worn or partially damaged, there is no need to replace the entire device; only the damaged component needs to be replaced, significantly reducing maintenance costs. The components can be easily disassembled to clean residual dye crystals and other impurities from the inner wall of the tube, preventing impurity accumulation from affecting mixing efficiency. Component replacement requires no complex equipment and can be completed using only conventional tools, reducing maintenance difficulty and time costs.

[0012] The components are made of polytetrafluoroethylene-filled graphite material, which significantly improves the resistance to strong acids compared to traditional 316L stainless steel. It can withstand the corrosion of 90% strong acid dyes and 30% diluted acid dyes for a long time, extending the service life of the equipment from less than 2 months to 2-3 years, reducing production interruptions caused by frequent replacement due to equipment corrosion, and ensuring production continuity.

[0013] The mixing chamber in the middle of the mixer shell is a variable-diameter circular cavity, with the upper diameter larger than the lower diameter, and connected by a converging frustum. This creates reasonable turbulence between the dye and water within the chamber, extending the mixing path and ensuring uniform mixing. The lower end of the water inlet pipe is inclined to correspond to the outer wall of the inner tube of the feed pipe. The water flow along the outer wall of the inner tube counteracts the dye, further promoting mixing and ultimately stabilizing the dye concentration after dilution. The inner tube of the feed pipe extends deep into the mixing chamber, ensuring that the dye is directly delivered to the mixing area, reducing residue. The upper end of the inner tube of the discharge pipe is flared, with the inlet diameter matching the bottom diameter of the mixing chamber, preventing dye residue after mixing. The outlet diameter of the discharge pipe is larger than the inlet diameter, reducing the dye flow rate and minimizing scouring losses to downstream pipelines. Attached Figure Description

[0014] Figure 1 This is an assembly diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the mixer housing of the present invention; Figure 3 This is a schematic diagram of the feed pipe of this utility model. Figure 4 This is a schematic diagram of the water inlet pipe of this utility model. Figure 5 This is a schematic diagram of the discharge pipe of this utility model.

[0015] In the diagram: 1. Feed pipe flange; 2. Feed pipe; 21. Inner pipe body; 22. Thread; 23. Outer pipe body; 3. Water inlet flange; 4. Water inlet pipe; 5. Mixer housing; 51. Water inlet connection port; 52. Feed pipe connection port; 53. Mixing chamber; 54. Discharge pipe connection port; 6. Discharge pipe. Detailed Implementation

[0016] Please see Figure 1-5 This utility model provides a corrosion-resistant, detachable mixing device, including a feed pipe 2, a water inlet pipe 4, a mixer housing 5, and a discharge pipe 6. The mixer housing 5 has a mixing chamber 53 inside, and a threaded feed pipe connection port 52 is provided at the upper end of the mixer housing 5. The feed pipe connection port 52 is screwed to the feed pipe 2, and a feed pipe flange 1 is screwed to the upper end of the feed pipe 2. A threaded water inlet pipe connection port 51 is provided on the side of the mixer housing 5, and the lower end of the water inlet pipe 4 is screwed into the water inlet pipe connection port 51. A water inlet pipe flange 3 is screwed to the upper end of the water inlet pipe 4. A discharge pipe connection port 54 is provided at the bottom of the mixer housing 5, and a discharge pipe 6 is screwed into the discharge pipe connection port 54. The pipe body is designed in three sections: the lower section is an inner pipe 21, which needs to penetrate into the mixing chamber 53 of the mixer housing 5, and the end is smoothed to avoid turbulence during raw material transport; the middle section is a threaded section 22, used for connecting to the feed pipe connection port 52 of the mixer housing 5. The screw connection ensures a tight seal; the upper part is the outer tube body 23, and the outer wall of the upper end of the outer tube body 23 is threaded for connecting the feed pipe flange 1.

[0017] A threaded section is provided on the outer wall of the upper end of the water inlet pipe 4 for connecting to the water inlet pipe flange 3; and the port faces the outer wall of the inner pipe 21 of the feed pipe 2, so that the water can flow downward along the outer wall of the inner pipe 21 to form a counter-current mixing with the raw materials and improve the mixing uniformity; a threaded section is provided in the middle of the pipe corresponding to the position of the water inlet pipe connection port 51 of the mixer shell 5 for screwing to the shell.

[0018] The mixing chamber 53 located in the middle of the mixer housing 5 is a variable-diameter circular cavity, with the upper diameter of the cavity being larger than the lower diameter, and the two sets of connections are linked by a tapering frustum. This structure allows the raw materials and water to form a spiral upward mixing flow within the cavity, extending the mixing path. At the same time, the velocity change generated by the variable diameter enhances the turbulence effect, improves the mixing uniformity, and avoids the problem of localized uneven concentration.

[0019] An elastic retaining ring groove is provided on the outer side of the upper end of the discharge pipe connection port 54, and an elastic retaining ring is installed inside the elastic retaining ring groove. One end of the elastic retaining ring is attached to the outer wall of the mixer housing 5, and the other end restricts the discharge pipe 6.

[0020] The feed pipe flange 1 and the water inlet flange 3 are made of PTFE-filled graphite plate and have a threaded hole in the middle. Bolt fixing holes are evenly opened on the outside of the threaded hole, with the center of the hole 20-25mm away from the flange edge, which facilitates the connection with the flange of the upstream raw material conveying pipeline. The inner wall of the bolt fixing hole is chamfered to avoid scratching the sealing gasket during installation. The feed pipe 2, water inlet pipe 4 and discharge pipe 6 are all made of PTFE-filled graphite tubes, while the mixer shell 5 is made of PTFE-filled graphite rod and is connected by wrapping with PTFE tape at the threaded connection.

[0021] Take the raw material tape and wrap it clockwise 5-6 times along the spiral direction of the threaded section 22 in the middle of the feed pipe 2. Keep the tension of the raw material tape uniform while wrapping to ensure that the thread profile is completely covered and does not exceed the end of the thread, so as to prevent the raw material tape from entering the mixing chamber 53 during assembly.

[0022] Hold the outer tube 23 of the feed pipe 2, align the threaded section of the raw material tape with the feed pipe connection port 52 of the mixer housing 5, and slowly screw it in. In the initial stage, manually screw it in 3-5 turns to ensure that the threads are aligned and there is no misalignment. Then, use an adjustable wrench to hold the outer tube 23 of the feed pipe 2 with a cotton cloth to prevent damage to the pipe wall, and tighten it clockwise to ensure a tight seal without damaging the threads.

[0023] Check whether the inner tube 21 of the feed pipe 2 is vertically inserted into the mixing chamber 53. If it is tilted, it needs to be loosened and readjusted and reassembled.

[0024] Wrap 4-5 turns of PTFE tape clockwise around the threaded section in the middle of the inlet pipe 4, covering the entire threaded section, and smoothly transition the end to the pipe body.

[0025] Align the inclined lower end of the water inlet pipe 4 with the water inlet pipe connection port 51 of the mixer housing 5, ensuring that the lower end port is 5-8mm away from the outer wall of the inner tube 21 of the feed pipe 2. Manually screw in the threaded section until it cannot be rotated. Use an adjustable wrench to hold the middle of the water inlet pipe 4 with a cotton cloth and tighten it clockwise.

[0026] After assembly, check if the tilt angle of the inlet pipe 4 is 30-45°. If the angle deviation exceeds 5°, it needs to be loosened and adjusted to ensure that the water flow can accurately impact the outer wall of the inner pipe 21.

[0027] After stretching the acid-resistant nitrile rubber material of the elastic retaining ring, embed it into the elastic retaining ring groove at the upper end of the discharge pipe connection port 54 of the mixer housing 5, ensuring that the retaining ring is completely in contact with the bottom of the groove without any protrusions or looseness; press along the circumference of the retaining ring with your finger to confirm that the retaining ring is firmly installed and will not fall off.

[0028] Wrap 6-7 turns of PTFE tape clockwise around the threaded section in the middle of the discharge pipe 6. When wrapping, make sure to cover each tooth of the thread and that the end of the PTFE tape does not exceed the connection between the thread and the flared end.

[0029] Align the flared end of the discharge pipe 6 with the discharge pipe connection port 54 of the mixer housing 5, and manually screw in the threaded section until the flared end is flush with the bottom of the mixer housing 5; use an adjustable wrench to hold the cotton cloth in the middle of the discharge pipe 6 and tighten it clockwise.

[0030] Wrap the raw material tape clockwise around the threaded section of the upper outer tube body 23 of the feed pipe 2 for 4-5 turns, with the wrapping height being the same as the length of the threaded section.

[0031] Align the center threaded hole of the feed pipe flange 1 with the upper thread of the feed pipe 2, and manually screw it in until the flange fits the stepped surface of the outer pipe body 23; use an adjustable wrench to hold the edge of the flange with cotton cloth, and tighten it clockwise to ensure that the flange and the feed pipe 2 are coaxial and without deviation.

[0032] Wrap 3-4 turns of PTFE tape clockwise around the upper threaded section of the inlet pipe 4, covering the entire thread length. Align the center threaded hole of the inlet pipe flange 3 with the upper thread of the inlet pipe 4, and manually screw it in until the flange fits against the stepped surface of the inlet pipe 4; use an adjustable wrench to hold the edge of the flange with a cotton pad, and tighten clockwise to ensure that the flange sealing surface is flat and without warping.

[0033] The upper end of the inner tube of the discharge pipe 6 has a flared constriction structure, and the inlet diameter of the discharge pipe 6 is the same as the bottom diameter of the mixing chamber 53, ensuring that the mixed dye can completely enter the discharge pipe and avoid residue; while the outlet diameter of the discharge pipe 6 is larger than the inlet diameter.

[0034] The inner tube 21 at the lower end of the feed pipe 2 extends into the mixing chamber 53, and the lower end of the water inlet pipe 4 is inclined to correspond to the outer wall of the inner tube 21.

Claims

1. A corrosion-resistant, detachable mixing device, comprising a feed pipe (2), a water inlet pipe (4), a mixer housing (5), and a discharge pipe (6), characterized in that: The mixer housing (5) has a mixing chamber (53) inside, and a threaded feed pipe connection port (52) is provided at the upper end of the mixer housing (5). The feed pipe connection port (52) is screwed to the feed pipe (2), and the upper end of the feed pipe (2) is screwed to the feed pipe flange (1). The side of the mixer housing (5) has a threaded water inlet connection port (51), and the lower end of the water inlet pipe (4) is screwed into the water inlet connection port (51). The upper end is screwed with a water inlet pipe flange (3), the bottom of the mixer housing (5) is provided with a discharge pipe connection port (54), and the discharge pipe (6) is screwed into the discharge pipe connection port (54). The inner tube body (21) of the lower part of the feed pipe (2) extends into the mixing chamber (53) inside the mixer housing (5), and the thread (22) in the middle of the feed pipe (2) is screwed onto the feed pipe connection port (52), and the upper part of the feed pipe (2) is the outer tube body (23).

2. The corrosion-resistant, detachable mixing device according to claim 1, characterized in that: The mixing chamber (53) provided in the middle of the mixer housing (5) is a variable diameter circular cavity, and the diameter of the upper end of the circular cavity is larger than that of the lower end, and the two sets of connections are connected by a tapering frustum.

3. The corrosion-resistant, detachable mixing device according to claim 1, characterized in that: An elastic retaining ring groove is provided on the outer side of the upper end of the discharge pipe connection port (54), and an elastic retaining ring is installed inside the elastic retaining ring groove. One end of the elastic retaining ring is attached to the outer wall of the mixer housing (5), and the other end restricts the discharge pipe (6).

4. The corrosion-resistant, detachable mixing device according to claim 1, characterized in that: The feed pipe flange (1) and water inlet flange (3) are made of polytetrafluoroethylene-filled graphite plate and have a threaded hole in the middle. Bolt fixing holes are evenly opened on the outside of the threaded hole. The feed pipe (2), water inlet pipe (4) and discharge pipe (6) are all made of polytetrafluoroethylene-filled graphite tubes. The mixer shell (5) is made of polytetrafluoroethylene-filled graphite rod and is connected by wrapping with raw material tape at the threaded connection.

5. The corrosion-resistant, detachable mixing device according to claim 1, characterized in that: The upper end of the inner tube of the discharge pipe (6) is a flared constriction structure, and the inlet diameter of the discharge pipe (6) is the same as the bottom diameter of the mixing chamber (53), while the outlet diameter of the discharge pipe (6) is larger than the inlet diameter.

6. The corrosion-resistant, detachable mixing device according to claim 1, characterized in that: The inner tube (21) at the lower end of the feed pipe (2) extends into the mixing chamber (53), and the lower end of the water inlet pipe (4) is inclined to correspond to the outer wall of the inner tube (21).

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