Power sealing structure of auxiliary impeller of centrifugal pump

Abstract

The utility model discloses a dynamic sealing structure of an auxiliary impeller of a centrifugal pump, and relates to the technical field of sealing structures of centrifugal pumps. The front pump comprises a front pump shell, a partition plate is fixedly connected to an inner cavity of the front pump shell, a front shaft sleeve is fixedly connected to an inner cavity of the partition plate, a main shaft is movably connected to an inner cavity of the front shaft sleeve, and an impeller body is fixedly connected to the surface of the main shaft. The sealing assembly is arranged, the stuffing box filled with the sealing stuffing wraps the front shaft sleeve, stuffing sealing is a common static sealing mode, the sealing effect is achieved through stuffing materials in the stuffing box, the stuffing is usually annular stuffing made of graphite or rubber or other corrosion-resistant materials, the stuffing is installed on the front shaft sleeve portion of the pump, and the sealing effect is good. The impeller body surrounds the main shaft to prevent liquid in the pump body from leaking to the outside, and the impeller body generates certain centrifugal force through rotation to help lubrication and pressure distribution between sealing surfaces, so that friction and leakage are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to centrifugal pump sealing structure technical field, especially, relate to a centrifugal pump secondary impeller power sealing structure. BACKGROUND

[0002] Centrifugal pump is the centrifugal force that relies on the impeller rotation to transport liquid, centrifugal pump secondary impeller power sealing structure mainly refers to in the sealing system of pump, adopt secondary impeller to realize the sealing effect of one kind of design, secondary impeller structure is usually used to prevent medium leakage, especially in some high pressure or high temperature application occasion, can effectively reduce sealing leakage, and keep the stable operation of pump;

[0003] Such as the Chinese utility model provides " a centrifugal pump sealing structure " patent number: 202323048060.4, this patent includes pump base, end sealing mechanism and middle section sealing mechanism, the pump base upper end is installed with pump body, the pump body inside is installed with shaft, the shaft left side is provided with end sealing mechanism for sealing the port, through snap ring and in the port slot, through the first sealing ring that size mutually fits in the first sealing groove in a series of sealing structure, improve the firmness and sealing property of sealing structure;

[0004] The above file although solved the existing sealing structure through single layer positioning mechanism and fixed, in the long time use process, the vibration transmission will cause the snap-in position to loosen and produce the gap problem, but still has the shortcoming that the sealing structure is easy to wear and reduces the sealing property, although the double-layer buckle type sealing structure is good relative to single layer sealing structure, but contact with the main shaft, the main shaft rotation will cause the wear of sealing structure, and the sealing property of sealing structure will reduce for a long time, therefore, here launches a centrifugal pump secondary impeller power sealing structure. UTILITY MODEL CONTENTS

[0005] The utility model discloses a centrifugal pump secondary impeller power sealing structure, through the cooperation of sealing assembly and protection assembly, solve the double-layer buckle type sealing structure of centrifugal pump sealing structure in the prior art although the sealing property is good relative to single layer sealing structure, but contact with the main shaft, the main shaft rotation will cause the wear of sealing structure, and the sealing property of sealing structure will reduce for a long time.

[0006] To solve the above technical problem, the utility model is realized through the following technical schemes.

[0007] The utility model discloses a centrifugal pump auxiliary impeller power seal structure, including the front pump shell, the inner chamber fixed connection of front pump shell has the partition, the inner chamber fixed connection of partition has the front shaft sleeve, the inner chamber swing joint has the main shaft of front shaft sleeve, the surface fixed connection has the impeller body of main shaft, the surface of main shaft is provided with the middle shaft sleeve, the surface of middle shaft sleeve is provided with sealing assembly, one side of front pump shell is provided with rear pump shell, and the inner chamber of rear pump shell is provided with protection assembly away from the one side of impeller body, sealing assembly includes the pump cover, and the inner chamber of pump cover sets up in the inner chamber of rear pump shell, and the inner chamber of pump cover is provided with the packing gland, and one side of pump cover is provided with packing gland, protection assembly includes rear bearing gland, and one side of rear bearing gland is fixedly connected with the surface of pump body through bolt, and rear bearing is provided on the one side of pump body inner chamber of rear bearing gland, and the inner wall of rear bearing inner ring is in contact with the surface of main shaft.

[0008] The utility model further sets up, the bottom fixed connection of front pump shell has the base, one side fixed connection has the bottom plate of base, and one side fixed connection has the support frame of bottom plate top, the top of support frame is fixedly connected with the bottom of rear pump shell, and the base can stably support the bottom of front pump shell, and the support frame of bottom plate and base fixed connection can stably support the bottom of rear pump shell, so that the centrifugal pump can be stably placed in the use position.

[0009] The utility model further sets up, the inner chamber of pump cover top is provided with water seal ring, and the material of water seal ring is ceramic material, and water seal ring is an important sealing element, is used for through the cooling or lubrication of liquid, reduces the friction and temperature rise of sealing area, and then improves the reliability of sealing and prolongs the service life of centrifugal pump.

[0010] The utility model further sets up, the inner chamber of rear pump shell is provided with front bearing gland, and one side of front bearing gland is provided with front bearing, and the inner wall of front bearing inner ring is in contact with the surface of main shaft, and front bearing is added in the part of main shaft away from rear bearing, and the longer main shaft is stably handled, and further improves its rotation stability.

[0011] The utility model further sets up, one side fixed connection has the mounting piece of rear pump shell bottom, the surface of mounting piece is provided with mounting hole, and one side is provided with screw hole of front pump shell bottom, and mounting bolt is inserted in the mounting hole inner chamber of mounting piece surface, and one end is screwed into the screw hole on the surface of front pump shell by rotating mounting bolt, so that the front pump shell and rear pump shell are connected to form a pump shell whole.

[0012] The utility model further sets up, one side of front axle sleeve is provided with impeller gasket, the surface of impeller body is contacted with the side of impeller gasket far away from front axle sleeve, and the main function of impeller gasket is to prevent the liquid (such as water, oil or other process fluid) in centrifugal pump inner chamber from leaking from the gap between impeller and pump body.

[0013] The utility model further sets up, one side of front axle sleeve is provided with impeller gasket, the surface of impeller body is contacted with the side of impeller gasket far away from front axle sleeve, and the main function of impeller gasket is to prevent the liquid (such as water, oil or other process fluid) in centrifugal pump inner chamber from leaking from the gap between impeller and pump body.

[0014] The utility model further sets up, one side of front axle sleeve is provided with impeller gasket, the surface of impeller body is contacted with the side of impeller gasket far away from front axle sleeve, and the main function of impeller gasket is to prevent the liquid (such as water, oil or other process fluid) in centrifugal pump inner chamber from leaking from the gap between impeller and pump body.

[0015] The utility model has following beneficial effect.

[0016] 1, the utility model discloses a sealing assembly is set up, and the packing gland of filling with sealing packing is wrapped around front axle sleeve, and the packing seal is a common static sealing mode, and the sealing effect is realized by the packing material in packing gland, and the packing is usually annular packing made of graphite, rubber or other corrosion -resistant material, is installed in the front axle sleeve portion of pump, surrounds the main shaft, prevents the liquid in pump body from leaking to the outside, and the impeller body generates certain centrifugal force by rotation, helps the lubrication and pressure distribution between sealing surface, thereby reduces friction and leakage.

[0017] 2, the utility model discloses a protection assembly is set up, and the rear bearing gland is fixed on one side of rear pump shell through bolt, and the rear bearing sleeve of rear bearing gland inner chamber is on the surface of main shaft, protects the surface of main shaft under the premise of not influencing the rotation of main shaft, can share the drive pressure on main shaft, improves the stability of main shaft rotation. ACCURACY OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing do simple introduction.

[0019] Figure 1 It is a kind of centrifugal pump secondary impeller power sealing structure's section view schematic diagram.

[0020] Figure 2 It is a kind of centrifugal pump secondary impeller power sealing structure's perspective view.

[0021] Figure 3 It is a kind of centrifugal pump secondary impeller power sealing structure's protection assembly's perspective view.

[0022] Figure 4 It is a kind of centrifugal pump auxiliary impeller power sealing structure in the sealing assembly of sectional view.

[0023] In the drawing: 1, front pump shell;2, partition;3, front shaft sleeve;4, main shaft;5, impeller body;6, middle shaft sleeve;7, sealing assembly;8, rear pump shell;9, protection assembly;701, pump cover;702, packing gland;703, packing gland;901, rear bearing gland;902, rear bearing;10, base;11, support frame;12, mounting;13, front end. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described below with reference to the drawings in the embodiments of the utility model. The described embodiments are only part of the embodiments of the utility model, not all. EMBODIMENT

[0025] Please refer to Figures 1-4 The utility model discloses a kind of centrifugal pump auxiliary impeller power sealing structure, including front pump shell 1, the inner cavity of front pump shell 1 is fixedly connected with partition 2, the inner cavity of partition 2 is fixedly connected with front shaft sleeve 3, the inner cavity of front shaft sleeve 3 is movably connected with main shaft 4, the surface of main shaft 4 is fixedly connected with impeller body 5, the center of main shaft 4 surface is provided with middle shaft sleeve 6, the surface of middle shaft sleeve 6 is provided with sealing assembly 7, the side of front pump shell 1 is provided with rear pump shell 8, the inner cavity of rear pump shell 8 is provided with protection assembly 9 away from impeller body 5 side, sealing assembly 7 includes pump cover 701, pump cover 701 is set in the inner cavity of rear pump shell 8, the inner cavity of pump cover 701 is provided with packing gland 702, the side of pump cover 701 is provided with packing gland 703, protection assembly 9 includes rear bearing gland 901, the surface of pump body is fixedly connected with the side of rear bearing gland 901 by bolt, rear bearing 902 is provided on the side of pump body inner cavity of rear bearing gland 901, the inner wall of inner ring of rear bearing 902 is in contact with the surface of main shaft 4.

[0026] Specifically: packing gland 702 wraps front shaft sleeve 3, the inner cavity of packing gland 702 is filled with sealing packing, sealing effect is realized using packing material in packing gland 702, packing is usually annular packing made of graphite, rubber or other corrosion-resistant materials, installed in the front shaft sleeve 3 part of pump, surrounds main shaft 4, prevents liquid in pump body from leaking to outside. EMBODIMENT

[0027] Please refer to Figures 1-4On the basis of embodiment one, the bottom of the front pump shell 1 is fixedly connected with a base 10, one side of the base 10 is fixedly connected with a bottom plate, one side of the top of the bottom plate is fixedly connected with a support frame 11, the top of the support frame 11 is fixedly connected with the bottom of the rear pump shell 8, the inner cavity of the top of the pump cover 701 is provided with a water seal ring, the material of the water seal ring is ceramic material, the inner cavity of the rear pump shell 8 is provided with a front bearing pressure cover, one side of the front bearing pressure cover is provided with a front bearing, the inner wall of the inner ring of the front bearing is in contact with the surface of the main shaft 4, one side of the bottom of the rear pump shell 8 is fixedly connected with a mounting piece 12, the surface of the mounting piece 12 is provided with a mounting hole, one side of the bottom of the front pump shell 1 is provided with a threaded hole, one side of the front shaft sleeve 3 is provided with an impeller gasket, one side of the impeller gasket away from the front shaft sleeve 3 is in contact with the surface of the impeller body 5, one side of the front end head 13 away from the rear pump shell 8 of the front pump shell 1 is provided with a sealing gasket, the inner cavity of the rear bearing pressure cover 901 is provided with a skeleton oil seal, the inner cavity of the skeleton oil seal is movably connected with the surface of the main shaft 4.

[0028] Specifically: the base 10 can stably support the bottom of the front pump shell 1, and the support frame 11 fixedly connected with the base 10 through the bottom plate can stably support the bottom of the rear pump shell 8, so that the centrifugal pump can be stably placed in the use position, the water seal ring is an important sealing element, which is used to reduce the friction and temperature rise of the sealing area through the cooling or lubricating effect of the liquid, thereby improving the reliability of the sealing and prolonging the service life of the centrifugal pump, the front bearing is added at the position of the main shaft 4 away from the rear bearing 902 to stably process the longer main shaft 4 and further improve its rotation stability, the mounting bolt is inserted into the mounting hole of the surface of the mounting piece 12, and one end of the mounting bolt is screwed into the threaded hole in the surface of the front pump shell 1, so as to connect the front pump shell 1 and the rear pump shell 8 to form a pump shell whole, the main function of the impeller gasket is to prevent the liquid such as water, oil or other process fluid in the inner cavity of the centrifugal pump from leaking from the gap between the impeller and the pump body, the front end head 13 belongs to the discharge end and is convenient to connect with external equipment, the discharge end is the place where the liquid flows out of the centrifugal pump, the fluid is finally discharged after passing through the pump body through the rotation of the impeller body 5 and the centrifugal force, and the skeleton oil seal is a key component in the sealing system and is usually used to seal the gap between the pump shaft and the pump shell to prevent fluid leakage.

[0029] The working principle of the utility model is: when the centrifugal pump starts, the motor or other power source drives the impeller body 5 of the centrifugal pump to rotate, there is no fluid flow when the centrifugal pump starts, until the impeller body 5 starts to rotate and starts to suck liquid, the impeller body 5 of the centrifugal pump rotates, the centrifugal force produced makes liquid flow from the suction end into the inner cavity of the front pump shell 1 and the rear pump shell 8, the suction end of the centrifugal pump is usually located in a low pressure area, therefore liquid is sucked from the external pipeline, the packing gland 702 filled with sealing packing wraps the front shaft sleeve 3, the packing seal is a common static sealing mode, sealing effect is realized by using the packing material in the packing gland 702, the packing is usually annular packing made of graphite, rubber or other corrosion resistant materials, is installed in the front shaft sleeve 3 part of the pump, surrounds the main shaft 4, prevents liquid in the pump body from leaking to the outside, the impeller body 5 generates certain centrifugal force by rotating, helps lubrication and pressure distribution between the sealing surfaces, thereby reducing friction and leakage.

[0030] The above disclosed preferred embodiments of the utility model are only used to help explain the utility model, the preferred embodiments do not describe all the details, and the utility model is not limited to the specific implementation mode, the description selects and specifically describes these embodiments, in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model.

Claims

1. A centrifugal pump secondary impeller dynamic seal structure comprising a front pump casing (1), characterized in that: The inner cavity of the front pump shell (1) is fixedly connected with a partition plate (2), the inner cavity of the partition plate (2) is fixedly connected with a front shaft sleeve (3), the inner cavity of the front shaft sleeve (3) is movably connected with a main shaft (4), the surface of the main shaft (4) is fixedly connected with an impeller body (5), the surface of the main shaft (4) is provided with a middle shaft sleeve (6) at the center, the surface of the middle shaft sleeve (6) is provided with a sealing assembly (7), one side of the front pump shell (1) is provided with a rear pump shell (8), the inner cavity of the rear pump shell (8) is provided with a protection assembly (9) away from the impeller body (5). The sealing assembly (7) comprises a pump cover (701), the inner cavity of the pump cover (701) is provided with a packing box (702), one side of the pump cover (701) is provided with a packing gland (703). The protection assembly (9) comprises a rear bearing gland (901), one side of the rear bearing gland (901) is fixedly connected with the surface of the pump body through bolts, one side of the rear bearing gland (901) in the inner cavity of the pump body is provided with a rear bearing (902), the inner wall of the inner ring of the rear bearing (902) is in contact with the surface of the main shaft (4).

2. A centrifugal pump secondary impeller power seal structure according to claim 1, characterized in that: The bottom of the front pump shell (1) is fixedly connected with a base (10), one side of the base (10) is fixedly connected with a bottom plate, one side of the top of the bottom plate is fixedly connected with a support frame (11), the top of the support frame (11) is fixedly connected with the bottom of the rear pump shell (8).

3. A centrifugal pump secondary impeller power seal structure according to claim 1, characterized in that: The inner cavity of the top of the pump cover (701) is provided with a water seal ring, the material of the water seal ring is ceramic material.

4. A centrifugal pump secondary impeller power seal structure according to claim 1, characterized in that: The inner cavity of the rear pump shell (8) is provided with a front bearing gland, one side of the front bearing gland is provided with a front bearing, the inner wall of the inner ring of the front bearing is in contact with the surface of the main shaft (4).

5. A centrifugal pump secondary impeller power seal structure according to claim 1, characterized in that: One side of the bottom of the rear pump shell (8) is fixedly connected with a mounting piece (12), the surface of the mounting piece (12) is provided with a mounting hole, one side of the bottom of the front pump shell (1) is provided with a threaded hole.

6. A centrifugal pump secondary impeller power seal structure according to claim 1, wherein: One side of the front shaft sleeve (3) is provided with an impeller gasket, one side of the impeller gasket away from the front shaft sleeve (3) is in contact with the surface of the impeller body (5).

7. A centrifugal pump secondary impeller power seal structure according to claim 1, wherein: One side of the front end head (13) away from the rear pump shell (8) is provided with a sealing gasket.

8. A centrifugal pump secondary impeller power seal structure according to claim 1, characterized in that: The inner cavity of the rear bearing gland (901) is provided with a skeleton oil seal, the inner cavity of the skeleton oil seal is movably connected with the surface of the main shaft (4).

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