Mechanical sealing device of submersible mixer

Abstract

The mechanical sealing device comprises an outer shell and a stirring shaft rotationally arranged in the outer shell through a bearing, a shaft penetrating hole used for allowing the stirring shaft to penetrate through is formed in the outer shell, and an air pressure seam is formed between the inner wall of the shaft penetrating hole and the outer wall of the stirring shaft. An air pressure chamber wrapping the outer side of the stirring shaft is formed in the side, close to the shaft penetrating hole, in the outer shell, the air pressure chamber is communicated with the air pressure seam, an air inflation and pressurization assembly used for inflating and pressurizing the air pressure chamber is arranged on the outer shell, and through cooperation of the air inflation and pressurization assembly, the air pressure chamber, the air pressure seam and the like, the stirring effect is improved. High-pressure air flow jetted outwards can be formed at the output rotating joint of the stirring shaft, the stirring performance is improved, meanwhile, the sealing effect can be achieved, non-contact sealing is achieved, abrasion can be reduced, and the service life can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal device for a submersible mixer. Background Art

[0002] Submersible mixer, also known as submersible propeller, is suitable for promoting and stirring sewage containing suspended matter, thin sludge, industrial process liquid, etc. in the process flow of sewage treatment plants, creating water flow, strengthening the stirring function, and preventing sludge sedimentation. It is an important equipment in the process flow of municipal and industrial sewage treatment. Submersible mixers are divided into mixing submersible mixers and low-speed submersible propulsion mixers.

[0003] A sealing device for a submersible mixer with application number 202322435248.8, comprising a submersible motor housing and an impeller, wherein a submersible motor is fixedly installed inside the submersible motor housing, one end of the impeller is fixedly connected to an output shaft of the submersible motor, an outer side of the impeller is fixedly connected to a guide cover via a fixing frame, and an end of the fixing frame away from the guide cover is welded and fixed to the submersible motor housing, and a sealing groove is provided at the connection of the submersible motor housing;

[0004] At present, the sealing of submersible mixers is mostly carried out by sealing bearings and sealing rings. The sealing rings will increase the friction during the rotation process and need to be replaced frequently to ensure the sealing performance. Utility Model Content

[0005] The purpose of the utility model is to provide a submersible mixer mechanical sealing device in order to solve the above-mentioned problems and overcome the defects of the prior art.

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

[0007] The utility model provides a submersible mixer mechanical sealing device, comprising an outer shell and a stirring shaft rotatably arranged in the outer shell through a bearing, the outer shell is provided with an axis through hole for passing the stirring shaft, an air pressure gap is formed between the inner wall of the axis through hole and the outer wall of the stirring shaft, an air pressure chamber wrapped around the outside of the stirring shaft is provided in the outer shell near the axis through hole, the air pressure chamber and the air pressure gap are connected to each other, and an inflation and pressurization component for inflating and pressurizing the air pressure chamber is provided on the outer shell.

[0008] Preferably, the inflation and pressurization assembly includes an air pressure pump fixedly arranged in an outer shell, the air inlet of the air pressure pump is connected to an air inlet pipe, the air outlet of the air pressure pump is connected to one end of an air outlet pipe, and the other end of the air outlet pipe extends into the air pressure chamber.

[0009] Preferably, a first sealing gasket is provided at both ends of the shaft through hole. When the air pressure chamber is inflated and pressurized, the first sealing gasket and the stirring shaft are separated from each other. When the air pressure in the air pressure chamber is zero, the first sealing gasket and the stirring shaft are in a state of close contact with each other.

[0010] Preferably, the cross-section of the first sealing gasket is J-shaped, and the first sealing gasket is made of rubber material.

[0011] Preferably, the size of the air pressure gap along the radial direction of the stirring shaft is 1mm-3mm.

[0012] Preferably, a spiral air guide groove is provided on the inner side wall of the through-axis hole.

[0013] Preferably, an air pressure sensor is provided in the air pressure chamber.

[0014] The beneficial effects are:

[0015] 1. Through the coordination of the inflatable pressurized components, the air pressure chamber and the air pressure seam, a high-pressure airflow can be formed at the output rotating connection of the stirring shaft, which can increase the stirring performance and also play a sealing role. The non-contact seal can reduce wear and increase the service life;

[0016] 2. The air pressure sensor can detect the air pressure inside the air pressure chamber, so as to adjust the air pressure in the air pressure chamber according to the air pressure sensor as the diving depth changes, and is suitable for inflation and sealing adjustment at different depths;

[0017] 3. The spiral air guide groove can form a spiral multi-layer protective airflow to prevent water from flowing into the air pressure chamber. 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 described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0020] Figure 2 This utility model Figure 1 A local enlarged view of point A;

[0021] Figure 3 This utility model Figure 1 Stereoscopic diagram.

[0022] The description of the accompanying drawings is as follows: 1. outer shell; 2. stirring shaft; 3. bearing; 4. inflation and pressurization assembly; 401. air pressure pump; 402. air inlet pipe; 403. air outlet pipe; 5. air pressure chamber; 6. first sealing gasket; 7. air pressure seam; 8. spiral air guide groove; 9. air pressure sensor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0024] See also Figure 1-Figure 3 As shown, the utility model provides a mechanical sealing device for a submersible mixer, comprising an outer shell 1 and a stirring shaft 2 rotatably arranged in the outer shell 1 through a bearing 3, the outer shell 1 is provided with a shaft hole for passing the stirring shaft 2, and an air pressure gap 7 is formed between the inner wall of the shaft hole and the outer wall of the stirring shaft 2, wherein the radial size of the air pressure gap 7 along the stirring shaft 2 is 1mm-3mm.

[0025] A pressure chamber 5 wrapped around the outside of the stirring shaft 2 is provided in the outer shell 1 near the shaft hole, and a pressure sensor 9 is provided in the pressure chamber 5. The pressure chamber 5 is connected to the pressure seam 7, and a gas-filling and pressurizing assembly 4 for inflating and pressurizing the pressure chamber 5 is provided on the outer shell 1. In practical applications, the pressure sensor 9 can detect the air pressure inside the pressure chamber 5, so that the pressure in the pressure chamber 5 is adjusted according to the pressure sensor 9 as the diving depth changes, and the inflation seal adjustment at different depths is applicable.

[0026] The inflation and pressurization component 4 includes an air pressure pump 401 fixedly arranged in the outer shell 1, the air inlet of the air pressure pump 401 is connected to the air inlet pipe 402, the air outlet of the air pressure pump 401 is connected to one end of the air outlet pipe 403, and the other end of the air outlet pipe 403 extends into the air pressure chamber 5.

[0027] First sealing gaskets 6 are provided at both ends of the shaft hole. When the air pressure chamber 5 is inflated and pressurized, the first sealing gasket 6 and the stirring shaft 2 are separated from each other. When the air pressure in the air pressure chamber 5 is zero, the first sealing gasket 6 and the stirring shaft 2 are in a state of being in close contact with each other. The cross-section of the first sealing gasket 6 is J-shaped, and the first sealing gasket 6 is made of rubber material.

[0028] The inner side wall of the through-shaft hole is provided with a spiral air guide groove 8. The spiral air guide groove 8 can form a spiral multi-layer protective airflow to prevent water from flowing into the air pressure chamber 5.

[0029] Working principle:

[0030] When using a submersible mixer, first open the inflation and pressurization component 4, and the inflation and pressurization component 4 inflates and pressurizes the air pressure chamber 5. The air pressure successively opens the first sealing gaskets 6 provided at both ends of the axial hole. At this time, the first sealing gasket 6 and the stirring shaft 2 are separated from each other, and the gas forms a high-pressure airflow in the air pressure gap 7 and a spiral airflow in the spiral air guide groove 8. Then, the shaft end of the stirring shaft 2 and the outer shell 1 are placed in water, and the driving motor that drives the stirring shaft 2 to rotate is turned on. In this process, the airflow forms a protective airflow at the air pressure gap 7 and the spiral air guide groove 8, which can play a sealing role. The greater the water pressure, the greater the pressurization in the air pressure chamber 5.

[0031] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A mechanical sealing device for a submersible mixer, characterized in that: The invention comprises an outer shell (1) and a stirring shaft (2) rotatably arranged in the outer shell (1) via a bearing (3); the outer shell (1) is provided with an axis-through hole for passing the stirring shaft (2); an air pressure gap (7) is formed between the inner wall of the axis-through hole and the outer wall of the stirring shaft (2); a pressure chamber (5) wrapped around the outer side of the stirring shaft (2) is provided in the outer shell (1) on one side close to the axis-through hole; the pressure chamber (5) and the pressure gap (7) are connected to each other; and an inflation and pressurization component (4) for inflating and pressurizing the air pressure chamber (5) is provided on the outer shell (1).

2. A submersible mixer mechanical seal device according to claim 1, characterized in that: The inflation and pressurization component (4) comprises an air pressure pump (401) fixedly arranged in the outer shell (1); the air inlet of the air pressure pump (401) is connected to an air inlet pipe (402); the air outlet of the air pressure pump (401) is connected to one end of an air outlet pipe (403); and the other end of the air outlet pipe (403) extends into the air pressure chamber (5).

3. A submersible mixer mechanical seal device according to claim 1, characterized in that: First sealing gaskets (6) are provided at both ends of the through-shaft hole. When the air pressure chamber (5) is inflated and pressurized, the first sealing gasket (6) and the stirring shaft (2) are in a state of being separated from each other. When the air pressure in the air pressure chamber (5) is zero, the first sealing gasket (6) and the stirring shaft (2) are in a state of being in close contact with each other.

4. A mechanical sealing device for a submersible mixer according to claim 3, characterized in that: The cross-section of the first sealing gasket (6) is J-shaped, and the first sealing gasket (6) is made of rubber material.

5. The mechanical sealing device for a submersible mixer according to claim 1, characterized in that: The size of the air pressure gap (7) along the radial direction of the stirring shaft (2) is 1 mm to 3 mm.

6. A submersible mixer mechanical seal device according to claim 1, characterized in that: A spiral air guide groove (8) is provided on the inner side wall of the shaft penetration hole.

7. A submersible mixer mechanical seal device according to claim 1, characterized in that: An air pressure sensor (9) is arranged in the air pressure chamber (5).

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