Filtering device for reducing indigo solution

Abstract

A filtering device for a reduced indigo solution comprises a tank body and a filtering assembly, the tank body comprises an upper-section tank body and a lower-section tank body, a reduced indigo solution inlet, a protective gas source inlet and a protective gas source outlet are formed in the top of the upper-section tank body, a discharging opening is formed in the bottom of the lower-section tank body, and a first flange plate is arranged at an opening in the lower end of the upper-section tank body; the upper end face of the upper-section tank body is provided with a first flange plate, the lower end face of the first flange plate is provided with an annular opening pressing groove, the upper end opening of the lower-section tank body is provided with a second flange plate, and the upper end face of the second flange plate is provided with an annular opening supporting groove; the filter partition plate is supported in the annular opening supporting groove, the pressing ring is limited by the annular opening pressing groove, and the filter cloth is supported on the filter partition plate and positioned by the pressing ring. The reduction indigo solution filtering device is simple in structure and convenient to maintain, oxidation can be effectively avoided on the basis of filtering a reduction indigo solution, and the quality of the reduction indigo solution is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a filtering device for reducing indigo solution. Background Art

[0002] Indigo is one of the oldest pigments known to mankind. At present, indigo is mainly sold as a powdered product and a dye bath is prepared by chemical reduction before printing and dyeing. Its disadvantages are coarse particles, wide particle size distribution range, a large amount of dust generated during the production process, and slow and uneven reduction rate during use, which is easy to cause uneven dyeing and affect the quality of printing and dyeing. Since indigo is insoluble in water, it is usually dyed with reduced indigo leuco body and then oxidized to make it colorable. At present, the main technical routes for the reduction of indigo include: bacterial reduction method, chemical reduction method, catalytic hydrogenation reduction method and electrochemical reduction method. The reduced indigo solution after catalytic hydrogenation pre-reduction contains a small amount of unreduced indigo and catalyst, forming insoluble impurities, which need to be separated by filtration. However, the reduced indigo solution is easily oxidized to indigo in the air, resulting in the filtration process being lower than the concentration of reduced indigo, affecting product quality.

[0003] Therefore, how to design a filtering device that can ensure the filtering quality of the reduced indigo solution is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The utility model aims to provide a filtering device for a reduced indigo solution in view of the deficiencies in the prior art. The device has a simple structure and is easy to maintain. On the basis of filtering the reduced indigo solution, oxidation can be effectively avoided to ensure the quality of the reduced indigo solution.

[0005] The technical scheme of the utility model is: a filtering device for reducing indigo solution, comprising a tank body and a filtering assembly, wherein the tank body comprises an upper tank body and a lower tank body, wherein a reducing indigo solution inlet, a protective gas source inlet and a protective gas source outlet are arranged at the top of the upper tank body, and a first valve, a second valve and a third valve are arranged in sequence to control opening and closing, a discharge port is arranged at the bottom of the lower tank body, and a fourth valve is arranged to control opening and closing, a first flange is arranged at the lower end opening of the upper tank body, and an annular opening pressure groove is arranged at the lower end surface of the first flange, a second flange is arranged at the upper end opening of the lower tank body, and an annular opening support groove is arranged at the upper end opening of the second flange, the filtering assembly comprises a filtering baffle, a pressing ring and a filter cloth, the filtering baffle is provided with a plurality of filter holes, the upper tank body and the lower tank body are detachably connected by passing through the first flange and the second flange through a plurality of bolts, the filtering baffle is supported in the annular opening support groove, the pressing ring is limited by the annular opening pressure groove, the filter cloth is supported on the filtering baffle and positioned by the pressing ring, and the combination constitutes a filtering device for reducing indigo solution.

[0006] The first flange and the second flange are connected via a hinge.

[0007] The first flange is fixed to the lower end opening of the upper tank body by welding, and the second flange is fixed to the upper end opening of the lower tank body by welding.

[0008] It also includes a bracket, which includes a support ring and a plurality of support legs fixedly arranged on the support ring. The support legs are evenly distributed along the circumference of the support ring and extend downward. The tank body is suspended on the bracket through a second flange.

[0009] The upper tank body, the lower tank body, the first flange and the second flange are all made of 304L stainless steel.

[0010] The above technical solution has the following beneficial effects:

[0011] 1. The filtering device for reducing indigo solution includes a tank body and a filtering assembly. The filtering tank body is used to provide a protective atmosphere and filtering pressure, and the filtering assembly is used to intercept insoluble impurities in the reducing indigo solution. The tank body includes an upper tank body and a lower tank body, that is, the tank body is a split structure. The top of the upper tank body is provided with a reducing indigo solution inlet, a protective gas source inlet, and a protective gas source outlet, and a first valve, a second valve, and a third valve are sequentially provided to control opening and closing. The bottom of the lower tank body is provided with a discharge port, and a fourth valve is provided to control opening and closing. The lower end opening of the upper tank body is provided with a first flange, and the lower end surface of the first flange is provided with an annular opening pressure groove. The upper end opening of the lower tank body is provided with a second flange, and the upper end surface of the second flange is provided with an annular opening support groove. The flange connection is stable and a surface seal is formed, and the sealing is strong. The filter assembly includes a filter baffle, a pressure ring, and a filter cloth. The filter baffle is provided with a plurality of filter holes. The upper tank body and the lower tank body are detachably connected by a plurality of bolts passing through a first flange and a second flange. The filter baffle is supported in an annular opening support groove, the pressure ring is limited by the annular opening pressure groove, the filter cloth is supported on the filter baffle and positioned by the pressure ring, and the combination constitutes a filtering device for reducing indigo solution. The filter assembly of this structure is stable and convenient for replacing the filter cloth. The remaining components can be reused, which reduces the filtering cost of the reduced indigo solution. By designing a protective gas source inlet and a protective gas source outlet, a protective atmosphere is formed in the tank body. At the same time, by injecting high-pressure protective gas, the reduced indigo solution can be filtered to ensure filtering quality and efficiency.

[0012] 2. The first flange and the second flange are connected by hinges, which improves the convenience of use and maintenance of the filtering device and reduces the labor intensity of use and maintenance of personnel.

[0013] 3. It also includes a bracket, which includes a support ring and a plurality of support legs fixedly arranged on the support ring. The support legs are evenly distributed along the circumference of the support ring and extend downward. The tank body is suspended on the bracket through a second flange, which can not only improve the stability of the filter device, but also facilitate the transfer of the filter device.

[0014] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the assembly of the filter assembly of the utility model;

[0017] Figure 3 It is a schematic diagram of the connection between the upper tank body and the lower tank body of the utility model.

[0018] In the accompanying drawings, 1 is a tank body, 11 is an upper tank body, 12 is a lower tank body, 2 is a filter assembly, 21 is a filter baffle, 22 is a pressure ring, 23 is a filter cloth, 3 is an inlet for reduced indigo solution, 4 is an inlet for a protective gas source, 5 is an outlet for a protective gas source, 6 is a discharge port, 7 is a first flange, 71 is an annular opening pressure groove, 8 is a second flange, 81 is an annular opening support groove, 9 is a bracket, 91 is a support ring, 92 is a support leg, a is a first valve, b is a second valve, c is a third valve, and d is a fourth valve. DETAILED DESCRIPTION

[0019] See also Figures 1 to 3, is a specific embodiment of a filtering device for reducing indigo solution. The filtering device for reducing indigo solution includes a tank body 1 and a filtering assembly 2. The tank body 1 includes an upper tank body 11 and a lower tank body 12, both of which are supported by 304L stainless steel material, with an operating pressure of 0-0.5Mpa and a temperature below 50°C. A reducing indigo solution inlet 3, a protective gas source inlet 4, and a protective gas source outlet 5 are arranged at the top of the upper tank body 11, and a first valve a, a second valve b, and a third valve c are arranged in sequence to control opening and closing. A discharge port 6 is arranged at the bottom of the lower tank body 12, and a fourth valve d is arranged to control opening and closing. The lower end opening of the upper tank body 11 is provided with a first flange 7, and the lower end surface of the first flange 7 is provided with an annular opening groove 71. The first flange is also made of 304L stainless steel and is fixed to the lower end opening of the upper tank body by welding. Usually, in order to reduce the dead angle in the tank body, the inner wall of the first flange is flush with the inner wall of the upper tank body, and the outer wall of the first flange exceeds the outer wall range of the upper tank body. The upper end opening of the lower tank body 12 is provided with a second flange 8, and the upper end surface of the second flange 8 is provided with an annular opening support groove 81. The second flange is also made of 304L stainless steel and is fixed to the upper end opening of the lower tank body by welding. In the connection relationship between the first flange and the upper tank body, the inner wall of the second flange is flush with the inner wall of the lower tank body, and the outer wall of the second flange exceeds the outer wall range of the lower tank body. In order to reduce the labor intensity of personnel use and maintenance, the first flange and the second flange are connected by hinges. The filter assembly 2 includes a filter baffle 21, a pressure ring 22, and a filter cloth 23. The filter baffle 21 is provided with a plurality of filter holes 24. The upper tank body 11 and the lower tank body 12 are detachably connected by a plurality of bolts passing through the first flange 7 and the second flange 8. The filter baffle 21 is supported in the annular opening support groove 81, the pressure ring 22 is limited by the annular opening pressure groove 71, and the filter cloth 23 is supported on the filter baffle 21 and positioned by the pressure ring 22, and the combination constitutes a filtering device for reducing indigo solution.

[0020] Usually, in order to improve the stability of the filtering device and facilitate feeding and discharging, a bracket 9 is also provided, wherein the bracket 9 comprises a support ring 91 and a plurality of support legs 92 fixedly provided on the support ring 91, wherein the support legs 92 are evenly distributed along the circumference of the support ring 91 and extend downward, and the tank body 1 is suspended on the bracket 9 by a second flange 8.

[0021] The working principle of the utility model is as follows: after the flange is fastened, all valves are closed, and corresponding valves are opened according to the operation: the second valve and the third valve are opened, vacuum is drawn through the protective gas source outlet, and nitrogen is added through the protective gas source inlet, and the second valve and the third valve are closed. The first valve is opened, and the reduced indigo solution is pressed into the tank, the first valve is closed, and the second valve and the fourth valve are opened to separate the reduced indigo solution from the indigo solid and the catalyst by filter pressing.

Claims

1. A filtering device for reducing indigo solution, characterized in that: The invention comprises a tank body (1) and a filter assembly (2), wherein the tank body (1) comprises an upper tank body (11) and a lower tank body (12), wherein a reducing indigo solution inlet (3), a protective gas source inlet (4) and a protective gas source outlet (5) are arranged at the top of the upper tank body (11), and a first valve (a), a second valve (b) and a third valve (c) are arranged in sequence to control opening and closing, and a discharge port (6) is arranged at the bottom of the lower tank body (12), and a fourth valve (d) is arranged to control opening and closing. The lower end opening of the upper tank body (11) is provided with a first flange (7), and the lower end surface of the first flange (7) is provided with an annular opening pressure groove (71). The upper opening of the lower tank body (12) is provided with a second flange (8), and the upper end surface of the second flange (8) is provided with an annular opening support groove (81). The filter assembly (2) comprises a filter baffle (21), a pressure ring (22), and a filter cloth (23); the filter baffle (21) is provided with a plurality of filter holes (24). The upper tank body (11) and the lower tank body (12) are detachably connected by a plurality of bolts passing through a first flange (7) and a second flange (8); the filter baffle (21) is supported in an annular open support groove (81); the pressure ring (22) is limited by the annular open pressure groove (71); the filter cloth (23) is supported on the filter baffle (21) and positioned by the pressure ring (22); the combination constitutes a filtering device for reducing indigo solution.

2. The filtering device for reducing indigo solution according to claim 1, characterized in that: The first flange (7) and the second flange (8) are connected via a hinge.

3. The filtering device for reducing indigo solution according to claim 1, characterized in that: The first flange (7) is fixed to the lower end opening of the upper tank body (11) by welding, and the second flange (8) is fixed to the upper end opening of the lower tank body (12) by welding.

4. The filtering device for reducing indigo solution according to claim 1, characterized in that: The invention also comprises a bracket (9), wherein the bracket (9) comprises a support ring (91) and a plurality of support legs (92) fixedly arranged on the support ring (91), wherein the support legs (92) are evenly distributed along the circumference of the support ring (91) and extend downward, and the tank body (1) is suspended and supported on the bracket (9) via a second flange (8).

5. The filtering device for reducing indigo solution according to claim 1, characterized in that: The upper tank body (11), the lower tank body (12), the first flange (7) and the second flange (8) are all made of 304L stainless steel.

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