Mechanical seal device with double seal structure

Abstract

The utility model relates to mechanical seal technical field especially relates to a kind of mechanical seal device with double-layer sealing structure, including main static ring, the rear end of main static ring is provided with driving ring, the outside of main static ring is provided with secondary static ring, the rear end of secondary static ring is provided with secondary driving ring, the rear end of secondary driving ring is provided with secondary spring, the outside one end of secondary spring is provided with fixed ring, and isolation cavity is provided between fixed ring and secondary static ring;Driving ring rotates with equipment rotating shaft and is closely combined with main static ring to form dynamic sealing surface, secondary driving ring is fixed on driving ring by fixed ring, make driving ring drive secondary driving ring synchronous rotation, so that secondary driving ring and secondary static ring form another layer dynamic sealing surface, secondary driving ring and secondary static ring are provided with axial elastic force by secondary spring, when equipment medium leaks, it will first enter isolation cavity, through double-layer sealing mode, when medium leaks, it will not immediately affect equipment normal operation, thereby sending leakage early warning in advance, it is convenient for operator to overhaul machine.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a mechanical seal device with a double-layer sealing structure. Background Technology

[0002] A mechanical seal is a precision sealing device used in rotating equipment. It is mainly used to prevent fluid leakage from the gap between the rotating shaft and the stationary housing of equipment such as pumps, compressors, and agitators. It achieves a dynamic sealing effect by forming an extremely thin fluid film when a pair of precision friction pairs rotate relative to each other.

[0003] Most current mechanical seal devices rely on the formation of an extremely thin fluid film when the friction pairs rotate relative to each other for sealing protection. Once the gap between the friction pairs exceeds the design threshold, it may directly lead to media leakage. There is no early warning, making it difficult to shut down and maintain the machine in time, which affects the sealing effect and can easily cause production accidents.

[0004] Therefore, in view of the fact that existing mechanical seal devices cannot provide early warning of leakage accidents, a mechanical seal device with a double-layer sealing structure can be designed. Through the double-layer sealing method, the leakage of the medium will not immediately affect the normal operation of the equipment, thereby issuing a leakage warning in advance, which makes it easier for operators to repair the machine in time, ensure the normal and stable operation of the equipment, and effectively enhance the practical value of the device. Utility Model Content

[0005] In order to overcome the problem that most mechanical seal devices, once the friction pair clearance exceeds the design threshold, may directly lead to media leakage, making it difficult to provide early warning, timely shutdown and maintenance, and easily causing production accidents, this utility model is proposed.

[0006] The technical solution of this utility model is as follows: a mechanical sealing device with a double-layer sealing structure, comprising a main stationary ring, a driving ring, a main spring, a positioning ring, a secondary stationary ring, a secondary driving ring, a secondary spring, a fixed ring, an isolation chamber, and an alarm. The driving ring is located at the rear end of the main stationary ring, the main spring is located at the rear end of the driving ring, a positioning ring is located at one outer end of the main spring, a secondary stationary ring is located at the outer side of the main stationary ring, a secondary driving ring is located at the rear end of the secondary stationary ring, a secondary spring is located at the rear end of the secondary driving ring, a fixed ring is located at one outer end of the secondary spring, an isolation chamber is provided between the fixed ring and the secondary stationary ring, and an alarm is located at the front end of the secondary stationary ring.

[0007] Preferably, the mechanical seal is fixed to the equipment housing by setting a main stationary ring. The active ring rotates with the equipment shaft and fits tightly with the main stationary ring to form a dynamic sealing surface. The main spring provides axial elasticity to ensure that the active ring and the main stationary ring are always in close contact, compensating for gaps caused by wear or axial movement. The position of the main spring is fixed by a positioning ring, and the preload of the main spring is adjusted in time. The auxiliary active ring is fixed on the active ring by a fixing ring, so that the active ring drives the auxiliary active ring to rotate synchronously, thereby forming another layer of dynamic sealing surface between the auxiliary active ring and the auxiliary stationary ring. The auxiliary spring provides axial elasticity to the auxiliary active ring and the auxiliary stationary ring to ensure that the auxiliary active ring and the auxiliary stationary ring are always in close contact. When the equipment medium leaks, it will first enter the isolation chamber through the gap between the auxiliary active ring and the auxiliary stationary ring. At this time, the presence of abnormal medium in the isolation chamber triggers the alarm to issue an alarm signal, thus achieving the effect that the normal operation of the equipment is not immediately affected when the medium leaks, and the leakage warning is issued in advance, which facilitates the operator to repair the machine in time and ensures the normal and stable operation of the equipment.

[0008] Preferably, the active ring is rotatably connected to the main stationary ring, the auxiliary active ring is rotatably connected to the auxiliary stationary ring, the fixed ring is fixedly connected to the outer front end of the active ring, and the isolation cavity is disposed between the contact end faces of the main stationary ring and the active ring.

[0009] Preferably, a first sealing ring is provided on the outer side of the bottom end of the auxiliary moving ring, and a sealing ring groove is provided at the bottom end of the first sealing ring.

[0010] Preferably, a second sealing ring is provided on the outer side of the top end of the fixing ring, and the second sealing ring is slidably connected to the sealing ring groove.

[0011] Preferably, a conductivity probe is installed at the front end of the secondary static ring, the conductivity probe is installed through the secondary static ring, the probe end of the conductivity probe is located inside the isolation cavity, and the conductivity probe is electrically connected to the alarm.

[0012] Preferably, the front end of the main stationary ring is provided with anti-rotation pins, and multiple sets of anti-rotation pins are provided, which are distributed in a ring shape at equal intervals on the outer side of the main stationary ring.

[0013] Preferably, a sealing ring is provided on the inner side of the active ring, the sealing ring is located at the inner front end of the active ring, and the outer surface of the sealing ring is spherical.

[0014] The beneficial effects of this utility model are:

[0015] When using a mechanical seal, the main stationary ring fixes the seal to the equipment housing. The driving ring rotates with the equipment shaft and fits tightly against the main stationary ring to form a dynamic sealing surface. The main spring provides axial elasticity, and the position of the main spring is fixed by a positioning ring. The preload of the main spring is adjusted in time. The auxiliary driving ring is fixed to the driving ring by a fixing ring, so that the driving ring drives the auxiliary driving ring to rotate synchronously. This creates another layer of dynamic sealing surface between the auxiliary driving ring and the auxiliary stationary ring. The auxiliary spring provides axial elasticity between the auxiliary driving ring and the auxiliary stationary ring. When the medium leaks, it first enters the isolation chamber through the gap between the auxiliary driving ring and the auxiliary stationary ring. At this time, the presence of abnormal medium in the isolation chamber triggers the alarm to issue an alarm signal. This addresses the problem that in most mechanical seal devices, once the friction pair gap exceeds the design threshold, it may directly lead to medium leakage, making early warning impossible and timely shutdown and maintenance difficult, which can easily cause production accidents. This enhances the practical value of the device. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a mechanical sealing device with a double-layer sealing structure according to this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional cross-sectional view of a mechanical sealing device with a double-layer sealing structure according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural diagram of the stationary ring of a mechanical sealing device with a double-layer sealing structure according to this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional structural diagram of the dynamic ring of a mechanical sealing device with a double-layer sealing structure according to this utility model.

[0020] Explanation of reference numerals in the attached diagram: 1. Main stationary ring; 101. Anti-rotation pin; 2. Active ring; 201. Sealing ring; 3. Main spring; 4. Positioning ring; 5. Secondary stationary ring; 6. Secondary active ring; 7. Secondary spring; 8. Fixed ring; 801. First sealing ring; 802. Sealing ring groove; 803. Second sealing ring; 9. Isolation chamber; 901. Conductivity probe; 10. Alarm. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figure 1 and Figure 2This utility model provides an embodiment of a mechanical sealing device with a double-layer sealing structure, comprising a main stationary ring 1, a driving ring 2, a main spring 3, a positioning ring 4, a secondary stationary ring 5, a secondary driving ring 6, a secondary spring 7, a fixed ring 8, an isolation cavity 9, and an alarm 10. The driving ring 2 is disposed at the rear end of the main stationary ring 1 and is rotatably connected to the main stationary ring 1. The main spring 3 is disposed at the rear end of the driving ring 2. The positioning ring 4 is disposed at one outer end of the main spring 3. The secondary stationary ring 5 is disposed at the outer side of the main stationary ring 1. The secondary driving ring 6 is disposed at the rear end of the secondary stationary ring 5 and is rotatably connected to the secondary stationary ring 5. The secondary spring 7 is disposed at the rear end of the secondary driving ring 6. The fixed ring 8 is disposed at one outer end of the secondary spring 7 and is fixedly connected to the outer front end of the driving ring 2. An isolation cavity 9 is disposed between the fixed ring 8 and the secondary stationary ring 5. The isolation cavity 9 is disposed between the contact end faces of the main stationary ring 1 and the driving ring 2. An alarm 10 is disposed at the front end of the secondary stationary ring 5.

[0023] Please see Figure 2 and Figure 4 In this embodiment, a first sealing ring 801 is provided on the outer side of the bottom end of the auxiliary moving ring 6, and a sealing ring groove 802 is provided at the bottom end of the first sealing ring 801. A second sealing ring 803 is provided on the outer side of the top end of the fixed ring 8. The second sealing ring 803 is fitted and slidably connected with the sealing ring groove 802. The second sealing ring 803 is embedded in the sealing ring groove 802, so that the first sealing ring 801 and the second sealing ring 803 ensure the sealing state of the isolation cavity 9. When the auxiliary spring 7 is elastically adjusted, the second sealing ring 803 slides and extends in the sealing ring groove 802 to ensure that the auxiliary stationary ring 5 and the end face of the auxiliary moving ring 6 are tightly fitted.

[0024] Please see Figure 3 and Figure 4 In this embodiment, a conductivity probe 901 is provided at the front end of the secondary static ring 5. The conductivity probe 901 passes through the secondary static ring 5 and is located inside the isolation cavity 9. The conductivity probe 901 is electrically connected to the alarm 10. The conductivity probe 901 monitors the medium in the isolation cavity 9 in real time. The medium leaks into the isolation cavity 9 through the gap between the end faces of the secondary static ring 5 and the secondary moving ring 6. The conductivity probe 901 captures the medium fluid information. At this time, the conductivity probe 901 sends a start signal to the alarm 10, thereby triggering the alarm 10 to sound.

[0025] The front end of the main stationary ring 1 is provided with anti-rotation pins 101. Multiple sets of anti-rotation pins 101 are provided and are distributed in a ring shape at equal intervals on the outer side of the main stationary ring 1. When installing the mechanical seal, the position of the main stationary ring 1 is fixed by the anti-rotation pins 101, which ensure that the main stationary ring 1 is stationary and does not rotate with the equipment shaft. The inner side of the active ring 2 is provided with a sealing ring 201. The sealing ring 201 is located at the inner front end of the active ring 2. The outer surface of the sealing ring 201 is set as a spherical surface. The sealing ring 201 ensures the sealing effect between the active ring 2 and the equipment shaft.

[0026] Before the equipment is put into operation, the anti-rotation pin 101 of the main stationary ring 1 is inserted into the equipment shell to fix the mechanical seal on the equipment shell. The position of the main spring 3 is fixed by the positioning ring 4. The preload of the main spring 3 is adjusted in time so that the main spring 3 elastically supports the end face of the active ring 2 and the main stationary ring 1 to fit tightly.

[0027] When the equipment is running, the sealing ring 201 ensures the sealing effect between the active ring 2 and the equipment shaft. The active ring 2 rotates synchronously with the equipment shaft, so that the active ring 2 and the main stationary ring 1 are tightly fitted to form a dynamic sealing surface.

[0028] At the same time, the rotation of the active ring 2 drives the auxiliary moving ring 6 on the fixed ring 8 to rotate synchronously, so that the auxiliary moving ring 6 and the auxiliary stationary ring 5 form another layer of dynamic sealing surface. The auxiliary spring 7 provides axial elastic force to the auxiliary moving ring 6 and the auxiliary stationary ring 5. At this time, the second sealing ring 803 slides up and down in the sealing ring groove 802 of the first sealing ring 801 to ensure that the auxiliary spring 7 can extend and retract normally.

[0029] When the equipment medium leaks, the leaked medium will first enter the isolation chamber 9 through the gap between the auxiliary moving ring 6 and the auxiliary stationary ring 5. At this time, the conductivity probe 901 detects the medium fluid information and triggers the alarm 10 to issue an alarm signal.

[0030] Through the above steps, the mechanical seal is fixed to the equipment housing by setting the main stationary ring 1. The active ring 2 rotates with the equipment shaft and fits tightly with the main stationary ring 1 to form a dynamic sealing surface. The main spring 3 provides axial elasticity to ensure that the active ring 2 and the main stationary ring 1 are always in close contact, compensating for gaps caused by wear or axial movement. The position of the main spring 3 is fixed by the positioning ring 4, and the preload of the main spring 3 is adjusted in time. The auxiliary moving ring 6 is fixed on the active ring 2 by the fixing ring 8, so that the active ring 2 drives the auxiliary moving ring 6 to rotate synchronously, thereby forming another layer of dynamic sealing surface between the auxiliary moving ring 6 and the auxiliary stationary ring 5. The auxiliary spring 7 provides axial elasticity to the auxiliary moving ring 6 and the auxiliary stationary ring 5 to ensure that the auxiliary moving ring 6 and the auxiliary stationary ring 5 are always in close contact. When the equipment medium leaks, it will first enter the isolation chamber 9 through the gap between the auxiliary moving ring 6 and the auxiliary stationary ring 5. At this time, the abnormal medium in the isolation chamber 9 triggers the alarm 10 to issue an alarm signal, so that the normal operation of the equipment will not be affected immediately when the medium leaks, and a leak warning is issued in advance, which makes it convenient for operators to repair the machine in time.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A mechanical seal device with a double-layer sealing structure, comprising a main stationary ring (1), a driving ring (2), a main spring (3), and a positioning ring (4), characterized in that: It also includes a secondary stationary ring (5), a secondary moving ring (6), a secondary spring (7), a fixed ring (8), an isolation chamber (9), and an alarm (10). The rear end of the main stationary ring (1) is provided with a moving ring (2), the rear end of the moving ring (2) is provided with a main spring (3), the outer end of the main spring (3) is provided with a positioning ring (4), the outer side of the main stationary ring (1) is provided with a secondary stationary ring (5), the rear end of the secondary stationary ring (5) is provided with a secondary moving ring (6), the rear end of the secondary moving ring (6) is provided with a secondary spring (7), the outer end of the secondary spring (7) is provided with a fixed ring (8), an isolation chamber (9) is provided between the fixed ring (8) and the secondary stationary ring (5), and the front end of the secondary stationary ring (5) is provided with an alarm (10).

2. The mechanical seal device with a double-layer sealing structure according to claim 1, characterized in that: The active ring (2) is rotatably connected to the main stationary ring (1), the auxiliary active ring (6) is rotatably connected to the auxiliary stationary ring (5), the fixed ring (8) is fixedly connected to the outer side of the front end of the active ring (2), and the isolation cavity (9) is located between the contact end faces of the main stationary ring (1) and the active ring (2).

3. A mechanical seal device with a double-layer sealing structure according to claim 1, characterized in that: A first sealing ring (801) is provided on the outer side of the bottom end of the auxiliary moving ring (6), and a sealing ring groove (802) is provided at the bottom end of the first sealing ring (801).

4. A mechanical seal device with a double-layer sealing structure according to claim 3, characterized in that: A second sealing ring (803) is provided on the outer side of the top end of the fixing ring (8), and the second sealing ring (803) is engaged and slidably connected with the sealing ring groove (802).

5. A mechanical seal device with a double-layer sealing structure according to claim 1, characterized in that: A conductivity probe (901) is provided at the front end of the secondary static ring (5). The conductivity probe (901) passes through the secondary static ring (5). The probe end of the conductivity probe (901) is located inside the isolation cavity (9). The conductivity probe (901) is electrically connected to the alarm (10).

6. A mechanical seal device with a double-layer sealing structure according to claim 1, characterized in that: The front end of the main stationary ring (1) is provided with anti-rotation pins (101), and multiple sets of anti-rotation pins (101) are provided. The anti-rotation pins (101) are distributed in a ring shape at equal intervals on the outside of the main stationary ring (1).

7. A mechanical seal device with a double-layer sealing structure according to claim 1, characterized in that: A sealing ring (201) is provided on the inner side of the active ring (2). The sealing ring (201) is located at the inner front end of the active ring (2), and the outer surface of the sealing ring (201) is spherical.

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