Mechanical defoaming equipment

Abstract

The utility model belongs to the technical field of papermaking machinery, and particularly relates to mechanical defoaming equipment which comprises an outer cylinder and an inner cylinder which are coaxially arranged, the lower end of the inner cylinder is open, a defoaming chamber is formed in an inner cavity of the inner cylinder, an impeller is rotatably arranged in the defoaming chamber and driven by a driving device to rotate, and a plurality of water through holes are formed in the side wall of the inner cylinder. According to the utility model, only one layer of impeller is arranged, the structure is simple and compact, the manufacturing and maintenance cost is saved, the space in the vertical direction of equipment is saved, the application range is wider, secondary cutting is carried out on bubbles through the water through holes protruding towards one side of the defoaming chamber on the inner cylinder body, and the defoaming effect is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking machinery, and particularly relates to a mechanical defoaming device. Background Art

[0002] Pulping black liquor contains a large amount of saponified substances, and it is extremely easy to generate foam when disturbed or in contact with air, which is not conducive to subsequent purification treatment. The common defoaming methods include chemical methods and mechanical methods. The chemical method requires adding defoaming agents to the liquid, which has a high cost and is prone to secondary pollution. Therefore, at present, each papermaking enterprise preferentially selects the mechanical method to eliminate the foam in the pulping black liquor.

[0003] The utility model patent with the application number of 201120281722.0 discloses a mechanical defoamer. The lower end of the main shaft is sequentially connected with an upper blade and a circular sieve plate from top to bottom. The upper blade and the circular sieve plate are located inside the inner cylinder. There are circular small holes on the side wall of the inner cylinder and the sieve plate. The lower blade is fixed at the bottom of the sieve plate. The upper blade and the sieve plate are driven by the main shaft to rotate. Most of the foam is broken by the blade at the bottom of the sieve plate, and the remaining foam continues to rise and is broken by the upper blade.

[0004] This mechanical defoamer has two layers of blades, which occupies a large space in the vertical direction, has a complex structure, and has high production manufacturing and later maintenance costs. Summary of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide a mechanical defoaming device with a simple structure, low production manufacturing and maintenance costs.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A mechanical defoaming device includes an outer cylinder and an inner cylinder arranged coaxially. The lower end of the inner cylinder is open, and its inner cavity forms a defoaming chamber. An impeller is rotatably arranged in the defoaming chamber, and the impeller is driven to rotate by a driving device. A plurality of water passing holes are arranged on the side wall of the inner cylinder, and the water passing holes are hemispherical protruding towards the defoaming chamber.

[0008] The following is the further optimization of the above technical solution by the utility model:

[0009] The top of the outer cylinder is fixedly connected with an upper sealing plate, and the upper surface of the upper sealing plate is fixedly connected with an installation bracket, and a driving device is fixedly installed on the installation bracket.

[0010] Further optimization: The lower end of the driving device is drivingly connected with a main shaft, the main shaft is rotatably installed on the installation bracket through a supporting component, and the impeller is fixedly installed at the lower end of the main shaft.

[0011] Further optimization: An annular liquid collecting chamber is formed between the outer cylinder and the inner cylinder, and the bottom of the outer cylinder is fixedly connected with an annular lower sealing plate adapted to the shape of the liquid collecting chamber.

[0012] Further optimization: A liquid storage tank is fixedly installed at the lower end of the outer cylinder body, and the opening at the lower end of the inner cylinder body is communicated with the opening at the upper end of the liquid storage tank.

[0013] Further optimization: A liquid discharge port is arranged at a position near the bottom on the side wall of the outer cylinder body, and a liquid return port is arranged at a position near the bottom on the side wall of the liquid storage tank. The liquid discharge port and the liquid return port are connected by a liquid discharge pipe.

[0014] Further optimization: A through hole is arranged at a position corresponding to the main shaft on the upper sealing plate, and the lower end of the main shaft extends into the defoaming chamber through the through hole.

[0015] Further optimization: An exhaust port is arranged on the upper sealing plate, and the exhaust port is communicated with the defoaming chamber.

[0016] The utility model adopts the above technical solutions and has the following beneficial effects:

[0017] The utility model only has one layer of rotating impeller, with a simple and compact structure, saving manufacturing and maintenance costs and saving space in the up and down directions of the equipment, and having a wider application range; the water passing holes recessed towards the defoaming chamber on the inner cylinder body perform secondary cutting on the bubbles, and the defoaming effect is better.

[0018] The following further illustrates the utility model with reference to the drawings and embodiments. Description of the Drawings

[0019] Figure 1 It is the front view of the overall structure of the embodiment of the utility model;

[0020] Figure 2 It is the right view of the overall structure of the embodiment of the utility model;

[0021] Figure 3 It is the sectional view of the overall structure of the embodiment of the utility model;

[0022] Figure 4 It is the schematic diagram of the opening structure on the side wall of the inner cylinder of the utility model.

[0023] In the figure: 1 - outer cylinder body; 2 - inner cylinder body; 3 - defoaming chamber; 4 - liquid collection chamber; 5 - liquid discharge port; 6 - liquid discharge pipe; 7 - liquid storage tank; 8 - upper sealing plate; 9 - lower sealing plate; 10 - mounting bracket; 11 - driving device; 12 - main shaft; 13 - supporting component; 14 - impeller; 15 - exhaust port; 16 - water passing hole; 17 - liquid return port. Specific Embodiments

[0024] As Figures 1-4As shown in the figure, a mechanical defoaming device includes an outer cylinder body 1 and an inner cylinder body 2. The outer cylinder body 1 and the inner cylinder body 2 are coaxially arranged. The inner cavity of the inner cylinder body 2 forms a defoaming chamber 3, and an annular liquid collection chamber 4 is formed between the outer cylinder body 1 and the inner cylinder body 2. A ring-shaped lower sealing plate 9 adapted to the shape of the liquid collection chamber 4 is fixedly arranged at the bottom of the outer cylinder body 1, and the lower end of the inner cylinder body 2 is open. When in use, the whole device is installed on the top of a liquid storage tank 7, and the opening at the lower end of the inner cylinder body 2 is communicated with the opening at the upper end of the liquid storage tank 7.

[0025] A liquid discharge port 5 is arranged at a position near the bottom of the side wall of the outer cylinder body 1. The liquid discharge port 5 is connected to a liquid return port 17 at the bottom of the liquid storage tank 7 through a liquid discharge pipe 6. An upper sealing plate 8 is arranged at the top of the outer cylinder body 1, and an exhaust port 15 is arranged on the upper sealing plate 8. The exhaust port 15 is communicated with the defoaming chamber 3.

[0026] An installation bracket 10 is fixedly arranged on the upper surface of the upper sealing plate 8. A driving device 11 is fixedly installed on the installation bracket 10. The lower end of the driving device 11 is drivingly connected to a main shaft 12. The main shaft 12 is rotationally installed on the installation bracket 10 through a supporting member 13. A through hole is arranged at a position corresponding to the main shaft 12 on the upper sealing plate 8. The lower end of the main shaft 12 extends into the defoaming chamber 3 through the through hole, and an impeller 14 is fixedly installed at the lower end of the main shaft 12.

[0027] In this embodiment, the driving device 11 is a driving motor, and the driving motor is used to provide power to drive the impeller 14 to rotate in the defoaming chamber 3.

[0028] In this embodiment, the supporting member 13 is a bearing seat, and the bearing seat supports the main shaft 12 and at the same time ensures that the main shaft 12 can rotate under the drive of the driving device 11.

[0029] As Figure 4 shown, a plurality of water through holes 16 are arranged on the side wall of the inner cylinder body 2, and the water through holes 16 are hemispherical bulging towards the defoaming chamber 3.

[0030] During operation, the driving device 11 drives the impeller 14 to rotate at a high speed in the defoaming chamber 3, a negative pressure is formed in the defoaming chamber 3, and the bubbles at the top of the liquid storage tank 7 enter the defoaming chamber 3 under the action of the negative pressure. Some of the bubbles are broken after hitting the blades of the impeller 14, and the other part of the bubbles are thrown to the side wall of the inner cylinder body 2 under the action of the centrifugal force and hit the protruding part of the water through hole 16, and the bubbles are chopped up.

[0031] The gas after the bubble bursts is discharged through the exhaust port 15 at the top of the defoaming chamber 3. A part of the liquid flows along the inner wall of the inner cylinder 2 into the liquid storage tank 7, and the other part enters the liquid collection chamber 4 through the water passing holes 16. The special structure of the water passing holes 16 can also play a role in guiding the liquid, so that the liquid passing through the water passing holes 16 slowly flows along the outer side wall of the inner cylinder 2 into the liquid collection chamber 4, and then flows back to the liquid storage tank 7 along the liquid discharge port 5 at the bottom of the liquid collection chamber 4, avoiding the liquid splashing and generating new bubbles. In this way, the bubbles in the liquid storage tank 7 can be completely eliminated through repeated cycles.

[0032] For those of ordinary skill in the art, according to the teachings of the present utility model, without departing from the principles and spirit of the present utility model, any changes, modifications, substitutions and variations made to the embodiments still fall within the protection scope of the present utility model.

Claims

1. A mechanical defoaming device, comprising an outer cylinder body (1) and an inner cylinder body (2) arranged coaxially, characterized in that: The lower end of the inner cylinder body (2) is open, and its inner cavity forms a defoaming chamber (3). A impeller (14) is rotatably arranged in the defoaming chamber (3), and the impeller (14) is driven to rotate by a driving device (11). A plurality of water through holes (16) are arranged on the side wall of the inner cylinder body (2), and the water through holes (16) are hemispherical protruding towards the defoaming chamber (3).

2. A mechanical defoaming device according to claim 1, characterized in that: The top of the outer cylinder body (1) is fixedly connected with an upper sealing plate (8), and an installation bracket (10) is fixedly connected to the upper surface of the upper sealing plate (8). A driving device (11) is fixedly installed on the installation bracket (10).

3. A mechanical defoaming device according to claim 2, characterized in that: The lower end of the driving device (11) is drivingly connected with a main shaft (12). The main shaft (12) is rotatably installed on the installation bracket (10) through a supporting component (13). The impeller (14) is fixedly installed at the lower end of the main shaft (12).

4. A mechanical defoaming device according to claim 3, characterized in that: An annular liquid collection chamber (4) is formed between the outer cylinder body (1) and the inner cylinder body (2). The bottom of the outer cylinder body (1) is fixedly connected with an annular lower sealing plate (9) adapted to the shape of the liquid collection chamber (4).

5. A mechanical defoaming device according to claim 4, characterized in that: A liquid storage tank (7) is fixedly installed at the lower end of the outer cylinder body (1). The opening at the lower end of the inner cylinder body (2) is communicated with the opening at the upper end of the liquid storage tank (7).

6. The mechanical defoaming device according to claim 5, characterized in that: A liquid discharge port (5) is arranged at a position near the bottom of the side wall of the outer cylinder body (1), and a liquid return port (17) is arranged at a position near the bottom of the side wall of the liquid storage tank (7). The liquid discharge port (5) and the liquid return port (17) are connected by a liquid discharge pipe (6).

7. A mechanical defoaming device according to claim 6, characterized in that: A through hole is arranged on the upper sealing plate (8) corresponding to the position of the main shaft (12). The lower end of the main shaft (12) extends into the defoaming chamber (3) through the through hole.

8. A mechanical defoaming device according to claim 7, characterized in that: An exhaust port (15) is arranged on the upper sealing plate (8), and the exhaust port (15) is communicated with the defoaming chamber (3).

Images