Vertical magnetic pump sealing device

Abstract

The utility model belongs to the technical field of magnetic drive pump sealing assemblies, and particularly relates to a vertical magnetic drive pump sealing device which comprises a sealing bush, and a plurality of first grooves, an air inlet annular channel, a plurality of second grooves and a third groove are sequentially formed in the sealing bush from top to bottom. The first groove and the second groove are annular grooves, and the third groove is a spiral groove. The sealing device of the vertical magnetic drive pump can prevent materials from moving upwards and entering the bearing cavity, so that the bearing is prevented from being damaged, the operation cycle of the magnetic drive pump is greatly prolonged, and the maintenance cost of the magnetic drive pump is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic pump sealing components, and in particular relates to a vertical magnetic pump sealing device. Background Art

[0002] The currently known sealing forms of vertical magnetic pumps are: 1. Bushing seal, 2. Oil seal, 3. Mechanical seal. In theory, the sealing performance of bushing seal should be very good. However, in the actual production process, the magnetic pump produced by bushing seal often causes the material to flow up, so that the material enters the bearing and causes the bearing to be damaged, resulting in high maintenance frequency and high cost of the magnetic pump, resulting in a lot of manpower and physical waste. The existing magnetic pumps using bushing seals usually need to be repaired after an operating cycle of 1-3 months, which causes inconvenience in actual production. Utility Model Content

[0003] The purpose of the utility model is to solve the problem of material upward movement caused by the bushing seal described in the above background technology. A new vertical magnetic pump sealing device is proposed, which can prevent material from upward movement into the bearing, thereby greatly extending the operating cycle of the magnetic pump.

[0004] A technical solution adopted to achieve the above-mentioned purpose is a vertical magnetic pump sealing device, which includes a sealing sleeve, and the interior of the sealing sleeve is provided with a plurality of first grooves, an air intake ring channel, a plurality of second grooves and a third groove in sequence from top to bottom, the first groove and the second groove are annular grooves, and the third groove is a spiral groove.

[0005] Existing bushings usually rely on the gap between the bushing and the bearing for sealing. This setting can easily cause materials to flow into the bearing and cause damage to the bearing. The utility model greatly enhances the sealing performance of the device by setting grooves of different shapes and intervals inside the sealing bushing. These grooves are combined with each other to prevent materials from entering the bearing.

[0006] Furthermore, the first grooves are arranged at a first spacing between each other, and the second grooves are arranged at a second spacing between each other, and the first spacing is smaller than the second spacing.

[0007] Furthermore, an air inlet hole is provided on the side wall of the sealing bushing, and the air inlet annular channel is connected with the outside of the sealing bushing through the air inlet hole.

[0008] Furthermore, the vertical magnetic pump sealing device also includes a nitrogen storage tank, and the nitrogen storage tank is connected to the air inlet through a pipeline.

[0009] Furthermore, a gas pressure reducing valve and a flow meter are also provided on the pipeline connecting the nitrogen storage tank and the air inlet.

[0010] Furthermore, a gas booster pump is also provided on the pipeline connecting the nitrogen storage tank and the air inlet.

[0011] In the above technical solution, nitrogen can enter the sealing device through the gas booster pump, flow meter and gas pressure reducing valve. After entering the sealing device, nitrogen forms air pressure in the bearing cavity, and the nitrogen enters the material along the spiral third groove. The air pressure is always greater than the impeller back pressure, thereby preventing the material from rushing up into the bearing cavity.

[0012] Furthermore, the sealing bushing is made of graphite-filled PTFE.

[0013] Furthermore, the widths of the first groove, the second groove and the third groove are 2-3 mm.

[0014] Furthermore, a connecting ring is provided on the circumference of the sealing bushing, and a plurality of threaded holes are provided on the connecting ring.

[0015] The advantages of the utility model are:

[0016] 1. The utility model arranges grooves of different shapes and intervals in the sealing bushing, and additionally provides an air inlet ring channel, through which nitrogen is introduced, so that the air pressure in the groove is higher than the impeller back pressure, thereby preventing the material from rushing up into the bearing cavity and damaging the bearing.

[0017] 2. Compared with the existing graphite sealing bushings, the operating cycle of the utility model is increased from 1-3 months to more than 1 year, which greatly extends the operating cycle and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Illustrations: 1. Sealing bushing, 2. First groove, 3. Second groove, 4. Third groove, 5. Inlet ring, 6. Inlet hole, 7. Connecting ring, 8. Threaded hole. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] like Figure 1 As shown, a vertical magnetic pump sealing device includes a sealing bushing 1 and a nitrogen storage tank. The interior of the sealing bushing is provided with 7 first grooves 2, an air intake annular channel 5, 6 second grooves 3 and a third groove 4 from top to bottom. The first groove and the second groove are annular grooves, and the third groove is a spiral groove.

[0024] The vertical magnetic pump sealing device of the utility model is installed in the vertical magnetic pump, the first groove is close to the bearing side of the vertical magnetic pump, and the third groove is close to the material side of the vertical magnetic pump.

[0025] In this embodiment, the seven first grooves are arranged at equal intervals at a first pitch, and the six second grooves are arranged at equal intervals at a second pitch, and the first pitch is smaller than the second pitch.

[0026] In this embodiment, an air inlet hole 6 is provided on the side wall of the sealing bushing, and the air inlet hole communicates with the air inlet annular channel and the outside of the sealing bushing.

[0027] In this embodiment, the nitrogen storage tank is connected to the air inlet through a pipeline, and a gas pressure reducing valve and a flow meter are provided on the connected pipeline.

[0028] In this embodiment, a gas booster pump is also provided on the pipeline connecting the nitrogen storage tank and the air inlet hole, which is used to pressurize the nitrogen so that the air pressure formed by the nitrogen entering the sealing bushing is greater than the impeller back pressure. It should be noted that if the nitrogen pressure in the factory meets the above conditions, a gas booster pump may not be provided, and the magnetic pump sealing device described in the utility model can be used to reduce the material upward movement by relying only on the gas pressure reducing valve and the flow meter.

[0029] In this embodiment, the sealing bushing is made of graphite-filled PTFE.

[0030] In this embodiment, the widths of the first groove, the second groove and the third groove are 2 mm, the depth of the first groove is 5 mm, the depth of the second groove is 5.2 mm, and the spiral direction of the third groove is the same as the rotation direction of the bearing.

[0031] In this embodiment, a connecting ring 7 is provided on the circumference of the sealing bushing, and a plurality of threaded holes 8 are provided on the connecting ring for connection and fixation.

[0032] The working principle of the utility model is as follows: when the magnetic pump is running, the gas booster pump is started to input 0.4-0.6MPa nitrogen into the sealing bushing through the air inlet hole. At this time, the nitrogen pressure in the sealing bushing is greater than the impeller back pressure. The pressure difference prevents the material from passing through, thereby preventing the material from entering the bearing side from the material side of the vertical magnetic pump and damaging the bearing.

[0033] Finally, it should be noted that this embodiment is only used to illustrate the present invention and does not limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A vertical magnetic pump sealing device, characterized in that: The vertical magnetic pump sealing device comprises a sealing bushing (1), wherein a plurality of first grooves (2), an air intake annular channel (5), a plurality of second grooves (3) and a third groove (4) are arranged in sequence from top to bottom inside the sealing bushing, wherein the first groove and the second groove are annular grooves, and the third groove is a spiral groove.

2. The vertical magnetic pump sealing device according to claim 1, characterized in that: The first grooves are arranged at a first interval between each other, and the second grooves are arranged at a second interval between each other, and the first interval is smaller than the second interval.

3. The vertical magnetic pump sealing device according to claim 1, characterized in that: The side wall of the sealing bushing is provided with an air inlet hole (6), and the air inlet annular channel is connected with the outside of the sealing bushing through the air inlet hole.

4. The vertical magnetic pump sealing device according to claim 3, characterized in that: The vertical magnetic pump sealing device also includes a nitrogen storage tank, which is connected to the air inlet through a pipeline.

5. The vertical magnetic pump sealing device according to claim 4, characterized in that: A gas pressure reducing valve and a flow meter are also provided on the pipeline connecting the nitrogen storage tank and the air inlet.

6. The vertical magnetic pump sealing device according to claim 5, characterized in that: A gas booster pump is also provided on the pipeline connecting the nitrogen storage tank and the air inlet.

7. The vertical magnetic pump sealing device according to claim 1, characterized in that: The sealing bushing is made of graphite-filled PTFE.

8. The vertical magnetic pump sealing device according to claim 1, characterized in that: The widths of the first groove, the second groove and the third groove are 2-3 mm.

9. The vertical magnetic pump sealing device according to claim 1, characterized in that: A connecting ring (7) is provided on the circumference of the sealing bushing, and a plurality of threaded holes (8) are provided on the connecting ring.

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