Medium-concentration paper pulp pump convenient for gas-liquid separation

Abstract

The utility model belongs to the technical field of paper pulp pumps, and particularly relates to a medium-concentration paper pulp pump convenient for gas-liquid separation, which comprises a front lining, a pump body, a turbulence generator, an impeller, a rear pump cover, a pump shaft, a pulp blocking gland, a pulp blocking plate, a mechanical seal, a suspension and a bearing, mechanical seals are arranged at the joints of the front lining, the rear pump cover and the pump body; the pump shaft is installed in the middle of an inner cavity of the pump body, an impeller is installed in the middle of the output end of the pump shaft, and a turbulence generator is installed at the extending end of the pump shaft and located in the front lining structure. A slurry blocking gland and a slurry blocking plate are sequentially installed between the impeller and the rear pump cover, the slurry blocking gland is connected with the rear pump cover through screws, and the slurry blocking plate is installed on the pump shaft. In the using process, paper pulp can be prevented from being sucked into a vacuum pipeline under the high vacuum degree, medium-concentration paper pulp is difficult to enter a vacuum suction system in the shutdown state, and the situation that a vacuum area and the pipeline need to be cleaned every time before restarting is conducted is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper pulp pump technical field, concretely is a kind of medium consistency paper pulp pump facilitating gas-liquid separation. BACKGROUND

[0002] In each unit operation of pulping in medium consistency technology, the delivery of medium consistency paper pulp fiber suspension is a necessary link, and the medium consistency paper pulp pump is the core equipment of the delivery link. When the paper pulp concentration exceeds 7%, the paper pulp suspension basically loses fluidity; the gas rate of medium consistency paper pulp suspension increases rapidly with the increase of mass fraction, and the gas must be removed during pumping, otherwise the serious "air blockage phenomenon" will occur in the pump inlet and impeller, affecting the normal operation of the pump, therefore, the effect of the degassing device will directly affect the delivery capacity of the medium consistency pulp pump.

[0003] At present, the gas-liquid separation structure of the traditional medium consistency paper pulp pump mainly adopts a secondary separation mechanism. The gas-liquid mixture is separated once by the turbulence generator in the front part of the impeller, and then separated twice by the main impeller. The separated gas enters the back of the impeller through the balance hole, and the paper pulp is thrown out by the centrifugal force generated by the back blade rotation of the impeller. The air is collected in the space close to the shaft center and is sucked by the vacuum system. Although this structure improves the gas-liquid separation effect, part of the liquid paper pulp is still sucked out by the suction system during the process, which causes the suction into the vacuum pipeline to block the pipeline, resulting in the failure of the pump to separate the gas and liquid in the pump and to reduce the performance of the pump.

[0004] Based on the above problems, a new type of medium consistency paper pulp pump facilitating gas-liquid separation is proposed. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the problems existing in the prior art, the utility model is proposed.

[0007] Therefore, the purpose of the utility model is to provide a medium consistency paper pulp pump facilitating gas-liquid separation, which can avoid the paper pulp being sucked into the vacuum pipeline under a high vacuum degree, and the medium consistency paper pulp is difficult to enter the vacuum suction system in the shutdown state, avoiding the need to clean the vacuum area and pipeline before each restart.

[0008] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical scheme:

[0009] A medium consistency pulp pump facilitating gas-liquid separation comprises a front liner, a pump body, a turbulence generator, an impeller, a rear pump cover, a pump shaft, a pulp blocking gland, a pulp blocking plate, a mechanical seal, a suspension and a bearing:

[0010] Wherein,

[0011] The front liner and the rear pump cover are installed at two ends of the pump body, and the connection parts of the front liner and the rear pump cover with the pump body are provided with mechanical seals; the pump shaft is installed in the middle of the inner cavity of the pump body, the output end of the pump shaft is provided with the impeller in the middle and the turbulence generator at the extending end, and the turbulence generator is located in the front liner structure; the pulp blocking gland and the pulp blocking plate are installed in sequence between the impeller and the rear pump cover, the pulp blocking gland is connected with the rear pump cover through screws, and the pulp blocking plate is installed on the pump shaft; the suspension is connected with the rear pump cover through bolts, the part of the pump shaft extending out of the pump body is supported in the suspension by the bearing, and the bearing is located in the suspension.

[0012] As a preferred scheme of the medium consistency pulp pump facilitating gas-liquid separation, the impeller structure is a semi-open centrifugal impeller, the main blade structure of the impeller adopts a combination mode of an inlet section straight blade and an outlet section cylindrical blade, the back blade structure is consistent with the main blade, the middle cover plate is provided with gas-liquid separation holes, the positions of the gas-liquid separation holes are close to the hub and the back surface of the back blade, the distance to the main shaft is greater than the distance from the outer circle of the secondary separation impeller to the main shaft, the number of the gas-liquid separation holes is consistent with the number of the main blades and the back blades, and the number of the gas-liquid separation holes is 6 or 8.

[0013] As a preferred scheme of the medium consistency pulp pump facilitating gas-liquid separation, the pulp blocking gland adopts a rotary body structure, the concave side of the pulp blocking gland is uniformly provided with rib plates inside, the rib plate structure adopts an S-shaped curve structure, the included angle between the inner and outer sides of the curve and the corresponding concentric arc is 60°-70°, and the number of the rib plates is 18-24.

[0014] As a preferred scheme of the medium consistency pulp pump facilitating gas-liquid separation, the gap between the back blade of the impeller and the pulp blocking gland is 0.8mm-1.2mm.

[0015] Compared with the prior art, the medium consistency pulp pump has the advantages that the gas-liquid secondary separation structure is used to improve the gas-liquid separation effect and reduce the fiber loss, the performance of the medium consistency pulp pump such as the head, the flow and the efficiency is improved, and the fiber is not easy to enter the vacuum area and the pipeline when the medium consistency pulp pump is stopped. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the present application will be described in detail below with reference to the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. Among them:

[0017] Fig. 1 is a structural schematic diagram of the present application;

[0018] Fig. 2 is a structural schematic diagram of the present application;

[0019] Fig. 3 is a structural schematic diagram of the present application.

[0020] In the figure; 1, front lining; 2, pump body; 3, turbulence generator; 4, impeller; 5, rear pump cover; 6, pump shaft; 7, pulp blocking gland; 8, pulp blocking plate; 9, mechanical seal; 10, suspension; 11, bearing. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0023] Secondly, the present application is described in detail in combination with the schematic diagram, and in order to facilitate the description, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0024] In order to make the purposes, technical schemes and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0025] The present application provides the following technical scheme: a medium concentration paper pulp pump convenient for gas-liquid separation, in the process of use, paper pulp can also be avoided to be sucked into the vacuum pipeline under a higher vacuum degree, and medium concentration paper pulp is also difficult to enter the vacuum suction system in the shutdown state, avoiding the need to clean the vacuum area and pipeline before each time restarting;

[0026] Figs. 1-2 The utility model discloses a kind of structures of a kind of embodiment of medium concentration paper pulp pump convenient for gas-liquid separation, its main part includes front lining 1, pump body 2, turbulence generator 3, impeller 4, rear pump cover 5, pump shaft 6, shutoff pulp gland 7, shutoff pulp plate 8, mechanical seal 9, suspension 10 and bearing 11;

[0027] Front lining 1 and rear pump cover 5 are installed at both ends of pump body 2, and mechanical seal 9 is arranged at the connecting place of front lining 1 and rear pump cover 5 with pump body 2;Pump shaft 6 is installed in the inner cavity of pump body 2 middle, and impeller 4 is installed in the middle of the output end of pump shaft 6 and the protruding end installs turbulence generator 3, and turbulence generator 3 is located in the structure of front lining 1;Shutoff pulp gland 7 and shutoff pulp plate 8 are sequentially installed between impeller 4 and rear pump cover 5, shutoff pulp gland 7 is connected by screw with rear pump cover 5, and shutoff pulp plate 8 is installed on pump shaft 6;Suspension 10 is connected with rear pump cover 5 by bolt, and the part of pump shaft 6 that protrudes from pump body 2 is supported in suspension 10 by bearing 11, and bearing 11 is located in suspension 10.

[0028] The structure of impeller 4 is semi-open centrifugal impeller, and the main blade structure of impeller 4 adopts the mode that the inlet section straight blade is combined with the outlet section cylindrical blade, the back blade structure form is consistent with the main blade, so that secondary gas-liquid separation is facilitated;The intermediate cover plate is provided with gas-liquid separation holes, the position of the gas-liquid separation holes is located close to the hub and close to the back surface of the back blade, the distance to the main shaft is greater than the distance from the outer circle of the secondary separation impeller to the main shaft, the number is consistent with the main blade and the back blade, and the number is 6 or 8 pieces, the structure is characterized in that the secondary separation impeller 4 is used to separate gas and liquid, and after secondary separation, the gas and liquid enter the vacuum area, so that the paper pulp entering the vacuum area can be prevented from blocking the pipeline.

[0029] Shutoff pulp gland 7 adopts a rotary body structure, compared with the traditional circular arc structure, the concave side of shutoff pulp gland 7 is uniformly provided with a plurality of ribs, the rib structure adopts an S-shaped curve structure, the included angle between the inner and outer sides of the curve and the corresponding concentric arc is 60°-70°, the number of ribs is 18-24, and the included angle position is at the middle position of the concave annular surface, the structure utilizes the fact that the liquid density is greater than the gas when the gas-liquid two-phase flows, the liquid has greater momentum, and is more likely to precipitate when encountering obstacles, so that the gas is more likely to flow out, and the gas-liquid separation is better achieved.

[0030] The gap between the back blade of impeller 4 and shutoff pulp gland 7 is 0.8mm-1.2mm, which can block the paper pulp from entering the vacuum area through the gap, so that the vacuum pipeline needs to be cleaned when restarting can be avoided.

[0031] Combined Figs. 1-2The secondary separation impeller 4 separates gas and liquid, and the gas and liquid enters the vacuum area after secondary separation, which prevents the paper pulp from entering the vacuum area to block the pipeline and reduces fiber loss; the performance of the medium consistency pulp pump such as the lift, flow and efficiency can be improved; and the fiber is not easy to enter the vacuum area and the pipeline when the medium consistency pulp pump is stopped.

[0032] Although the present application has been described with reference to the embodiments above, various improvements can be made and equivalent parts can be substituted without departing from the scope of the present application. In particular, the features of the embodiments disclosed in the present application can be combined with each other in any manner as long as there is no structural conflict, and the combinations are not exhaustively described in the present specification only for the purpose of saving space and resources. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A medium consistency pulp pump facilitating gas-liquid separation, characterized in that It comprises a front liner (1), a pump body (2), a turbulence generator (3), an impeller (4), a rear pump cover (5), a pump shaft (6), a shunt gland (7), a shunt plate (8), a mechanical seal (9), a suspension (10) and a bearing (11): Wherein, The front liner (1) and the rear pump cover (5) are installed at both ends of the pump body (2), and the connection between the front liner (1) and the rear pump cover (5) and the pump body (2) is provided with a mechanical seal (9); the pump shaft (6) is installed in the middle of the inner cavity of the pump body (2), the output end of the pump shaft (6) is installed with the impeller (4) and the extension end is installed with the turbulence generator (3), and the turbulence generator (3) is located in the structure of the front liner (1); the shunt gland (7) and the shunt plate (8) are installed between the impeller (4) and the rear pump cover (5) in sequence, the shunt gland (7) is connected with the rear pump cover (5) through screws, and the shunt plate (8) is installed on the pump shaft (6); the suspension (10) is connected with the rear pump cover (5) through bolts, the part of the pump shaft (6) extending out of the pump body (2) is supported in the suspension (10) by the bearing (11), and the bearing (11) is located in the suspension (10).

2. A pump for medium consistency pulp according to claim 1, characterized in that: The structure of the impeller (4) is a semi-open centrifugal impeller, the main blade structure of the impeller (4) adopts the combination of an inlet section straight blade and an outlet section cylindrical blade, the back blade structure is consistent with the main blade; the middle cover plate is provided with gas-liquid separation holes, the position of the gas-liquid separation holes is close to the hub and the back surface of the back blade, the distance to the main shaft is greater than the distance from the outer circle of the secondary separation impeller to the main shaft, the number is consistent with the main blade and the back blade, and the number is 6 or 8.

3. A pump for medium consistency pulp according to claim 1, characterized in that: The shunt gland (7) adopts a rotary body structure, the concave side of the shunt gland (7) is uniformly provided with rib pieces, the rib piece structure adopts an S-shaped curve structure, the included angle between the inner and outer sides of the curve and the corresponding concentric arc is 60°-70°, and the number of rib pieces is 18-24.

4. A pump for medium consistency pulp according to claim 1, characterized in that: The gap between the back blade of the impeller (4) and the shunt gland (7) is 0.8mm-1.2mm.

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