An online high-pressure dynamic mixer

Abstract

The present application relates to a kind of online high-pressure dynamic mixers.The present application includes power device, including mixing stirring shaft and the driving assembly for the torque provided for the mixing stirring shaft;PAM dosing device is connected with the power device, the PAM dosing device includes PAM dosing cavity, the PAM dosing cavity is provided with PAM medicament inlet, the mixing stirring shaft includes hollow shaft communicated with the PAM dosing cavity;Mud medicine mixing device is connected with the PAM dosing device, the mud medicine mixing device includes mud medicine mixing cavity, the mixing stirring shaft passes through the PAM dosing cavity and extends into the mud medicine mixing cavity, and the hollow shaft is provided with medicine outlet and stirring blade in the part of mud medicine mixing cavity portion.The present application has the characteristics of compact structure, small size, high pressure resistance and high-efficiency mixing, and meets the installation space requirement.

Description

Technical Field

[0001] The invention relates to the technical field of stirring equipment, in particular to an online high-pressure dynamic mixer, which is a mud-drug mixing device when excess sludge from a city water plant is deeply dehydrated by a chamber filter press. Background Art

[0002] To prevent water pollution, existing waterworks require deep dehydration, using polyacrylamide (PAM) as a flocculant. This flocculant works by adding PAM to sludge with a moisture content of 99.2-99.8%. Through adsorption and bridging, PAM aggregates unstable, dispersed sludge particles into larger flocs, achieving sludge-water separation. This is then pressurized and deep-dehydrated using a chamber filter press.

[0003] To prevent sludge flocs from breaking up, the mixer must be installed on the pipe connecting the sludge lift pump to the chamber filter press feed port. Therefore, the mixer must also have compact dimensions to meet installation space requirements. Due to the rapid pumping velocity (maximum 3.5m / s) and high pressure (maximum 12bar) of the sludge, the mixer must be able to withstand high pressure and be able to instantly and thoroughly mix the sludge at even higher pressures (maximum 16bar).

[0004] Therefore, how to design a mixer that meets the requirements of compact size, high pressure resistance and efficient mixing is an urgent problem to be solved. Summary of the Invention

[0005] To this end, the present invention provides an online high-pressure dynamic mixer, which has the characteristics of compact structure, small size, high pressure resistance and efficient mixing, and meets the installation space requirements.

[0006] In order to solve the above technical problems, the present invention provides an online high-pressure dynamic mixer, comprising:

[0007] A power device, comprising a mixing and stirring shaft and a drive assembly for providing torque to the mixing and stirring shaft;

[0008] A PAM dosing device is connected to the power device, the PAM dosing device includes a PAM dosing cavity, the PAM dosing cavity is provided with a PAM agent inlet, and the mixing and stirring shaft includes a hollow shaft connected to the PAM dosing cavity;

[0009] The mud-medicine mixing device is connected to the PAM dosing device, and the mud-medicine mixing device includes a mud-medicine mixing cavity. The mixing stirring shaft passes through the PAM dosing cavity and extends into the mud-medicine mixing cavity. The hollow shaft is provided with a medicine outlet and stirring blades in the part located in the mud-medicine mixing cavity.

[0010] In one embodiment of the present invention, the power device includes a variable frequency motor and a bearing seat body connected to the variable frequency motor, the variable frequency motor output shaft is connected to the mixing and stirring shaft, and the mixing and stirring shaft is rotatably connected to the bearing seat body.

[0011] In one embodiment of the present invention, the variable frequency motor output shaft is connected to the mixing and stirring shaft via a flat key.

[0012] In one embodiment of the present invention, an angular contact rolling bearing is provided in the bearing seat body, and the mixing shaft is connected to the bearing seat body through two rows of the angular contact rolling bearings. A spacer ring is provided between the two rows of the angular contact rolling bearings, and a locking nut is provided on one side of one row of the angular contact rolling bearings, and the other row of the angular contact rolling bearings is offset against the step of the mixing shaft.

[0013] In one embodiment of the present invention, an oiler for injecting grease into the two rows of angular contact rolling bearings is provided at the outer end of the bearing seat body, and a first sealing ring and a second sealing ring are respectively provided between the openings on both sides of the bearing seat body and the mixing shaft to prevent grease from overflowing.

[0014] In one embodiment of the present invention, both sides of the PAM dosing cavity are connected to the bearing seat body and the mud-drug mixing cavity through connecting flanges respectively.

[0015] In one embodiment of the present invention, the gap between the PAM dosing cavity and the mixing and stirring shaft is sealed by a balanced mechanical seal, a pressure cover is provided between the PAM dosing cavity and the mud-drug mixing cavity to isolate the two, the pressure cover is provided with a sliding bearing supported on the mixing and stirring shaft, a third sealing ring is provided between the pressure cover and the PAM dosing cavity, and a leakage port is reserved in the PAM dosing cavity.

[0016] In one embodiment of the present invention, a sludge feed interface flange and a chamber filter press feed port interface flange are respectively provided on both ends of the mud-medicine mixing cavity in a direction perpendicular to the axis of the mixing and stirring shaft.

[0017] In one embodiment of the present invention, the shape of the medicine outlet includes an oblong hole shape, and the stirring blades and the medicine outlet are arranged alternately along the circumference.

[0018] In one embodiment of the present invention, the mixing and stirring shaft is provided with non-metallic auxiliary stirring blades near the PAM dosing cavity.

[0019] The above technical solution of the present invention has the following advantages over the prior art:

[0020] The online high-pressure dynamic mixer has the characteristics of compact structure, small size, high pressure resistance and high-efficiency mixing, and meets the installation space requirement.

[0021] The design of the spacer ring, the lock nut and the double-row angular contact rolling bearing prevents axial movement and radial vibration of the mixing stirring shaft during high-speed rotation, and maintains stability; the balanced mechanical seal and the plurality of sealing rings are used to seal the key components, preventing lubricating grease overflow and sludge leakage.

[0022] The medicine outlet adopts a long circular hole shape, and the staggered arrangement of the stirring blades prevents blockage and ensures high-speed multi-point injection of the PAM medicament and full mixing of the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in conjunction with the drawings.

[0024] Figure 1 is the overall structure schematic diagram of the online high-pressure dynamic mixer of the application.

[0025] Figure 2 is the cross-sectional structure schematic diagram of the online high-pressure dynamic mixer of the application.

[0026] Figure 3 is the cross-sectional structure schematic diagram of the power device of the application.

[0027] Figure 4 is the cross-sectional structure schematic diagram of the PAM medicament adding device of the application.

[0028] Figure 5 is the cross-sectional structure schematic diagram of the sludge medicament mixing device of the application.

[0029] DESCRIPTION OF DRAWINGS

[0030] 100, power device; 101, bearing seat body; 102, variable frequency motor; 103, mixing stirring shaft; 1031, hollow shaft; 1032, medicine outlet; 104, angular contact rolling bearing; 105, spacer ring; 106, lock nut; 107, oil injector; 108, first sealing ring; 109, second sealing ring;

[0031] 200, PAM medicament adding device; 201, PAM medicament adding cavity; 202, mechanical seal; 203, gland; 204, sliding bearing; 205, third sealing ring; 206, leakage port; 207, PAM medicament inlet; 28,

[0032] 300. Mud-drug mixing device; 301. Mud-drug mixing chamber; 302. Screw; 303. Mixing blade; 304. Auxiliary mixing blade; 305. Sludge feed interface flange; 306. Chamber filter press feed port interface flange. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0034] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0035] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0036] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figure 1 、 Figure 2 As shown, an online high-pressure dynamic mixer of the present invention comprises:

[0038] The power device 100 includes a mixing shaft 103 and a drive assembly for providing torque to the mixing shaft 103;

[0039] The PAM dosing device 200 is connected to the power device 100, and the PAM dosing device 200 comprises a PAM dosing cavity 201, the PAM dosing cavity 201 is provided with a PAM medicament inlet 207, and the mixing stirring shaft 103 comprises a hollow shaft 1031 in communication with the PAM dosing cavity 201;

[0040] The mud medicine mixing device 300 is connected to the PAM dosing device 200, and the mud medicine mixing device 300 comprises a mud medicine mixing cavity 301, the mixing stirring shaft 103 passes through the PAM dosing cavity 201 and extends into the mud medicine mixing cavity 301, and the hollow shaft 1031 is provided with a medicine outlet 1032 and stirring blades 303 at the part located in the mud medicine mixing cavity 301.

[0041] In some embodiments, referring to Figure 3 As shown, the power device 100 comprises a variable frequency motor 102 and a bearing seat body 101 connected to the variable frequency motor 102 through a flange, the output shaft of the variable frequency motor 102 is connected to the mixing stirring shaft 103 through a flat key, and the mixing stirring shaft 103 is rotatably connected in the bearing seat body 101.

[0042] The bearing seat body 101 is provided with angular contact rolling bearings 104, the mixing stirring shaft 103 is connected to the bearing seat body 101 through two rows of angular contact rolling bearings 104, a spacer ring 105 is arranged between the two rows of angular contact rolling bearings 104, one side of one row of angular contact rolling bearings 104 is provided with a locking nut 106, and the other row of angular contact rolling bearings 104 abuts against the step of the mixing stirring shaft 103.

[0043] The outer side end of the bearing seat body 101 is provided with an oil injector 107 for injecting lubricating grease to the two rows of angular contact rolling bearings 104, and first and second sealing rings 108 and 109 are respectively arranged between the openings on both sides of the bearing seat body 101 and the mixing stirring shaft 103; the two sides of the PAM dosing cavity 201 are respectively connected to the bearing seat body 101 and the mud medicine mixing cavity 301 through connecting flanges.

[0044] The above arrangement realizes high-speed rotation of the mixing stirring shaft 103, and the spacer ring 105 and the locking nut 106 ensure that the mixing stirring shaft 103 does not axially move and radially jump when rotating at 1450 rpm. The lubricating grease in the automatic oil injector 107 lubricates the two rows of angular contact rolling bearings 104, and the first and second sealing rings 108 and 109 seal the left and right sides of the bearing seat body 101 to prevent the lubricating grease from overflowing.

[0045] In order to achieve instantaneous and efficient mixing of the mud and medicine, the mixer power device 100 must ensure sufficient mixing and stirring intensity. The power device 100 uses a motor with a power of 3.0 kilowatts and a speed of 1450 rpm to drive the mixing and stirring shaft 103 equipped with stirring blades 303 to rotate at high speed to fully mix with the encountered mud and medicine, and uses a speed-adjustable frequency conversion motor 102 according to the process mud and medicine ratio.

[0046] In some embodiments, reference Figure 4 As shown, the high-pressure (Pmax=16 bar) PAM liquid agent pumped by the dosing pump enters the high-speed rotating hollow shaft 1031 at this PAM agent inlet 207 and is ejected at the drug outlet 1032 of the mud-drug mixing cavity 301.

[0047] The gap between the PAM dosing chamber 201 and the mixing shaft 103 is sealed by a balanced mechanical seal 202. A gland 203 is installed between the PAM dosing chamber 201 and the mud-medicine mixing chamber 301 to isolate them. Because the mixing shaft 103 is long and cantilevered, the gland 203 is equipped with a sliding bearing 204 that supports the mixing shaft 103. This further ensures that the mixing shaft 103 does not experience radial runout and extends the replacement cycle of the mechanical seal 202. A third sealing ring 205 is installed between the gland 203 and the PAM dosing chamber 201, isolating the PAM dosing chamber 201 from the outside world. Furthermore, to prevent leakage due to seal failure, the PAM dosing chamber 201 is provided with a leak port 206.

[0048] Reference Figure 5 As shown, the sludge pumped by the sludge pump meets the PAM agent in the sludge-medicine mixing chamber 301. The chamber 301 is provided with a sludge feed interface flange 305 and a chamber filter press feed interface flange 306 at both ends, perpendicular to the axis of the mixing shaft 103. This in-line high-pressure dynamic mixer adopts a "T"-shaped overall layout, resulting in a compact structure.

[0049] To achieve thorough mixing of the mud and drug, the PAM liquid must be mixed with the sludge in a high-speed, multi-point spray pattern. To prevent clogging, an oblong-shaped drug outlet 1032 is used, and the stirring blades 303 are arranged circumferentially staggered with the drug outlet 1032. Multiple drug outlets 1032 are provided within the mud and drug mixing chamber 301, ensuring that the PAM agent is sprayed at a high flow rate and meets the sludge. Simultaneously, the stirring blades 303, secured by screws 302, stir the mud and drug as the mixing shaft 103 rotates at high speed, instantly reacting to form larger flocs and achieving mud-water separation. Furthermore, the mixing shaft 103 is equipped with non-metallic auxiliary stirring blades 304 near the PAM dosing chamber 201 to prevent sludge from flowing back into the PAM dosing chamber 201.

[0050] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An online high-pressure dynamic mixer, characterized in that: include: A power device (100) comprising a mixing and stirring shaft (103) and a drive assembly for providing torque to the mixing and stirring shaft (103); A PAM dosing device (200) is connected to the power device (100), the PAM dosing device (200) comprises a PAM dosing cavity (201), the PAM dosing cavity (201) is provided with a PAM agent inlet (207), and the mixing and stirring shaft (103) comprises a hollow shaft (1031) in communication with the PAM dosing cavity (201); A mud-medicine mixing device (300) is connected to the PAM dosing device (200), the mud-medicine mixing device (300) comprising a mud-medicine mixing cavity (301), the mixing and stirring shaft (103) passing through the PAM dosing cavity (201) and extending into the mud-medicine mixing cavity (301), and the hollow shaft (1031) is provided with a medicine outlet (1032) and a stirring blade (303) at a portion located in the mud-medicine mixing cavity (301); The power device (100) comprises a variable frequency motor (102) and a bearing seat body (101) connected to the variable frequency motor (102); an output shaft of the variable frequency motor (102) is connected to the mixing and stirring shaft (103); and the mixing and stirring shaft (103) is rotatably connected to the bearing seat body (101); An angular contact rolling bearing (104) is provided in the bearing seat body (101), and the mixing shaft (103) is connected to the bearing seat body (101) through two rows of the angular contact rolling bearings (104), and a spacer ring (105) is provided between the two rows of the angular contact rolling bearings (104), wherein a locking nut (106) is provided on one side of one row of the angular contact rolling bearings (104), and the other row of the angular contact rolling bearings (104) is abutted against a step of the mixing shaft (103); The gap between the PAM dosing cavity (201) and the mixing and stirring shaft (103) is sealed by a balanced mechanical seal (202); a pressure cover (203) is provided between the PAM dosing cavity (201) and the mud-drug mixing cavity (301) to isolate the two; the pressure cover (203) is provided with a sliding bearing (204) supported on the mixing and stirring shaft (103); a third sealing ring (205) is provided between the pressure cover (203) and the PAM dosing cavity (201); and a leakage port (206) is reserved in the PAM dosing cavity (201); A sludge feed interface flange (305) and a chamber filter press feed port interface flange (306) are respectively provided on both ends of the mud-medicine mixing cavity (301) in a direction perpendicular to the axis of the mixing and stirring shaft (103).

2. An online high-pressure dynamic mixer according to claim 1, characterized in that, The output shaft of the variable frequency motor (102) is connected to the mixing and stirring shaft (103) via a flat key.

3. An online high-pressure dynamic mixer according to claim 1, characterized in that, An oiler (107) for injecting grease into the two rows of angular contact rolling bearings (104) is provided at the outer end of the bearing seat body (101), and a first sealing ring (108) and a second sealing ring (109) are respectively provided between the openings on both sides of the bearing seat body (101) and the mixing shaft (103) to prevent the grease from overflowing.

4. An online high-pressure dynamic mixer according to claim 1, characterized in that, Both sides of the PAM dosing cavity (201) are connected to the bearing seat body (101) and the mud-drug mixing cavity (301) via connecting flanges, respectively.

5. An online high-pressure dynamic mixer according to claim 1, characterized in that, The shape of the medicine outlet (1032) includes an oblong hole shape, and the stirring blades (303) and the medicine outlet (1032) are arranged alternately along the circumference.

6. An online high-pressure dynamic mixer according to claim 1, characterized in that, The mixing and stirring shaft (103) is provided with non-metallic auxiliary stirring blades (304) near the PAM dosing cavity (201).

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