Rotary shaft mechanical sealing device and sealing equipment

Abstract

The utility model relates to a rotating shaft mechanical sealing device and sealing equipment, the rotating shaft mechanical sealing device comprises a supporting assembly and a sealing assembly, the supporting assembly comprises a shaft sleeve and a machine base, the shaft sleeve penetrates through the machine base, the machine base is provided with a first inlet, a first outlet, a second inlet and a second outlet, and one end of the first inlet is communicated with the first outlet; the other end is communicated with the sealing medium mechanism; one end of the second inlet communicates with the second outlet, and the other end communicates with the sealing medium mechanism; the sealing assembly comprises a first moving ring, a first static ring, a second moving ring and a second static ring, the first moving ring and the second moving ring are installed on the shaft sleeve, the first static ring and the second static ring are arranged on the machine base in a sliding mode, the first static ring abuts against the first moving ring, and the first inlet and the first outlet correspond to the first static ring; the second static ring abuts against the second moving ring, and the second inlet and the second outlet both correspond to the second static ring. According to the mechanical sealing device, the sealing medium drives the first static ring to abut against the first movable ring and drives the second static ring to abut against the second movable ring, and sealing is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a mechanical seal device and sealing equipment for a rotating shaft. Background Technology

[0002] Mechanical seals are commonly used in fluid handling equipment such as submersible pumps, deep well pumps, pipeline pumps, sewage pumps, reactors, and solid-liquid mixing equipment. Traditional mechanical seals typically rely on the tension of a pressure spring or the repulsive force of magnetic levitation to press the rotating ring against the stationary ring for sealing. However, pressure springs are highly susceptible to corrosion by corrosive fluids, or they can easily fatigue due to prolonged use, leading to gaps at the sealing surface. Furthermore, the high-speed rotation of the shaft generates heat, and the magnet weakens or even fails under high temperatures, causing leakage at the sealing surface. This can prevent the equipment (such as pumps and reactors) from functioning properly, thus affecting its lifespan. Utility Model Content

[0003] Therefore, it is necessary to provide a mechanical seal device and sealing equipment for a rotating shaft with excellent sealing performance to address the above problems.

[0004] A rotating shaft mechanical seal device includes a support assembly and a sealing assembly. The support assembly includes a bushing and a base. The bushing passes through the base. The base has a first inlet, a first outlet, a second inlet, and a second outlet. One end of the first inlet is connected to the first outlet, and the other end is connected to a sealing medium mechanism. One end of the second inlet is connected to the second outlet, and the other end is connected to the sealing medium mechanism. The sealing assembly includes a first rotating ring, a first stationary ring, a second rotating ring, and a second stationary ring. The first rotating ring and the second rotating ring are respectively mounted on the bushing. The first stationary ring and the second stationary ring are respectively slidably disposed on the base. The first stationary ring abuts against the first rotating ring. The first inlet and the first outlet are both corresponding to the first stationary ring. The second stationary ring abuts against the second rotating ring. The second inlet and the second outlet are both corresponding to the second stationary ring.

[0005] In one embodiment, the base is provided with a cooling inlet and a cooling outlet, the cooling inlet is connected to the cooling outlet, the cooling inlet is located between the first inlet and the second inlet, and the cooling outlet is located between the first outlet and the second outlet; one end of the cooling inlet is connected to the cooling outlet, and the other end is connected to the cooling medium mechanism, and one end of the cooling outlet is connected to the cooling medium mechanism.

[0006] In one embodiment, the sealing assembly further includes a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring. The first sealing ring is installed on the first stationary ring and is used to seal the first stationary ring and the machine base. The second sealing ring is installed on the first rotating ring and is used to seal the first rotating ring and the bushing. The third sealing ring is installed on the second stationary ring and is used to seal the second stationary ring and the machine base. The fourth sealing ring is installed on the second rotating ring and is used to seal the second rotating ring and the bushing.

[0007] In one embodiment, the sealing assembly further includes a fixing seat installed within the machine base, the bushing passing through the fixing seat, and one side of the second stationary ring abutting against the fixing seat.

[0008] In one embodiment, the sealing assembly further includes a fifth sealing ring, which is mounted on the mounting base and is used to seal the base and the mounting base.

[0009] In one embodiment, the system further includes a bearing and a gland, wherein the bearing is installed inside the housing and is sleeved on the outside of the bushing; the gland is installed on the housing and one end of the gland abuts against the outer ring of the bearing.

[0010] In one embodiment, the support assembly further includes a limiting ring mounted on the bushing, one end of which abuts against the inner ring of the bearing.

[0011] In one embodiment, a positioning ring is further included, which is mounted on the end of the bushing away from the limiting ring; the positioning ring is provided with a plurality of guide grooves.

[0012] A sealing device, characterized in that it includes the above-mentioned rotating shaft mechanical seal device.

[0013] In one embodiment, the sealing medium mechanism includes a storage tank, a gas valve, a feed pipe, a return pipe, multiple valves, and multiple pressure gauges. The storage tank is used to store the sealing medium. The gas valve is installed on the storage tank. One end of the feed pipe is connected to the storage tank, and the other end is connected to the first inlet and the second inlet. One end of the return pipe is connected to the storage tank, and the other end is connected to the first outlet and the second outlet. The valve and the pressure gauge are installed on both the feed pipe and the return pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The mechanical seal device of this utility model achieves sealing by having the first stationary ring abut against the first moving ring and the second stationary ring abut against the second moving ring through the sealing medium; the mechanical seal device of this shaft has excellent sealing effect and long service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a rotating shaft mechanical seal device according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A sectional view along line AA.

[0018] Figure 3 for Figure 2 Enlarged view of center circle B;

[0019] Figure 4 for Figure 1 The diagram shows the structure of the positioning ring in the mechanical seal device of the rotating shaft.

[0020] Figure 5 for Figure 1 The mechanical seal device shown is in a cleaning state.

[0021] Figure 6 for Figure 5 A magnified view of center circle C;

[0022] Figure 7 This is a schematic diagram of the sealing device according to one embodiment of the present invention.

[0023] The meanings of the numbers in the attached diagram are as follows:

[0024] 100. Mechanical seal device for rotating shaft;

[0025] 10. Support assembly; 11. Bushing; 12. Machine base; 121. First inlet; 122. First outlet; 123. Second inlet; 124. Second outlet; 125. Cooling inlet; 126. Cooling outlet; 127. Sealing cavity; 128. Cooling cavity; 13. Bearing; 14. Gland; 15. Limiting ring;

[0026] 20. Sealing assembly; 21. First rotating ring; 22. First stationary ring; 23. Second rotating ring; 24. Second stationary ring; 25. Fixing seat; 26. First sealing ring; 27. Second sealing ring; 28. Third sealing ring; 29. ​​Fourth sealing ring; 29a. Fifth sealing ring; 30. Positioning ring; 31. Guide groove;

[0027] 200. Sealing equipment;

[0028] 100. Rotary shaft mechanical seal device; 121. First inlet; 122. First outlet; 123. Second inlet; 124. Second outlet; 125. Cooling inlet; 126. Cooling outlet; 80. Sealing medium mechanism; 81. Storage tank; 82. Air valve; 83. Feed pipe; 84. Return pipe; 85. Valve; 86. Pressure gauge; 90. Cooling medium mechanism; 91. Cooling tank; 92. Switch; 93. Input pipe; 94. Output pipe; 95. Control valve; 96. Control gauge. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Please refer to Figures 1 to 6A mechanical seal device 100 for a rotating shaft according to one embodiment of the utility model includes a support assembly 10 and a sealing assembly 20. The support assembly 10 includes a bushing 11 and a base 12. The bushing 11 passes through the base 12. The base 12 is provided with a first inlet 121, a first outlet 122, a second inlet 123, and a second outlet 124. One end of the first inlet 121 is connected to the first outlet 122, and the other end is connected to the sealing medium mechanism. One end of the second inlet 123 is connected to the second outlet 124, and the other end is connected to the sealing medium mechanism. The sealing assembly 20 includes a first rotating ring 21, a first stationary ring 22, a second rotating ring 23, and a second stationary ring 24. The first rotating ring 21 and the second rotating ring 23 are respectively mounted on the bushing 11, and the first stationary ring 22 and the second stationary ring 24 are respectively slidably mounted on the base 12. The first stationary ring 22 abuts against the first rotating ring 21, and the first inlet 121 and the first outlet 122 are both set corresponding to the first stationary ring 22. The second stationary ring 24 abuts against the second rotating ring 23, and the second inlet 123 and the second outlet 124 are both set corresponding to the second stationary ring 24. This rotating shaft mechanical seal device 100 achieves sealing by using a sealing medium to drive the first stationary ring 22 to abut against the first rotating ring 21 and the second stationary ring 24 to abut against the second rotating ring 23.

[0036] like Figures 1 to 3As shown, in this embodiment, the support assembly 10 includes a bushing 11 and a base 12. The bushing 11 passes through the base 12. Optionally, the bushing 11 is used to connect a rotating shaft. The base 12 is provided with a first inlet 121, a first outlet 122, a second inlet 123, and a second outlet 124. One end of the first inlet 121 is connected to the first outlet 122, and the other end is connected to the sealing medium mechanism. One end of the first outlet 122 is connected to the sealing medium mechanism. One end of the second inlet 123 is connected to the second outlet 124, and the other end is connected to the sealing medium mechanism. One end of the second outlet 124 is connected to the sealing medium mechanism, and the sealing medium is supplied through the first inlet 121 and the second inlet 123. The sealing medium enters the base 12 and then flows back to the sealing medium mechanism through the first outlet 122 and the second outlet 124. Optionally, the base 12 is a hollow structure, and one end of the base 12 is connected to the material body to be sealed. The base 12 is provided with a sealing cavity 127 and a cooling cavity 128. The sealing cavity 127 is used to contain the sealing medium, and the cooling cavity 128 is used to contain the cooling medium. The first inlet 121 and the first outlet 122 are respectively connected to the sealing cavity 127. In one embodiment, the material body to be sealed is used to store liquid or solid-liquid mixture. The sealing medium is one of the liquid component, ordinary liquid, or gas in the material body, and the cooling medium is the liquid component or gas in the material body. Furthermore, the base 12 is provided with a cooling inlet 125 and a cooling outlet 126. The cooling inlet 125 is connected to the cooling outlet 126. The cooling inlet 125 is located between the first inlet 121 and the second inlet 123, and the cooling outlet 126 is located between the first outlet 122 and the second outlet 124. One end of the cooling inlet 125 is connected to the cooling outlet 126, and the other end is connected to the cooling medium mechanism. One end of the cooling outlet 126 is connected to the cooling medium mechanism. The cooling medium is input into the base 12 through the cooling inlet 125, and then flows back to the cooling medium mechanism through the cooling outlet 126. The cooling inlet 125 and the cooling outlet 126 are respectively connected to the cooling chamber 128.

[0037] Please check again. Figure 1 and Figure 2 The support assembly 10 also includes a bearing 13 and a pressure cap 14. The bearing 13 is installed inside the base 12 and is sleeved on the outside of the bushing 11. The bearing 13 positions the bushing 11, reducing the requirements on the rotating shaft. The pressure cap 14 is installed on the base 12, and one end of the pressure cap 14 abuts against the outer ring of the bearing 13. Optionally, the bearing 13 is a self-aligning bearing or a ball bearing. The support assembly 10 also includes a limiting ring 15, which is installed on the bushing 11. One end of the limiting ring 15 abuts against the inner ring of the bearing 13. The bearing 13 is securely fixed by the cooperation between the pressure cap 14 and the limiting ring 15. Optionally, the limiting ring 15 and the bushing 11 are threaded together.

[0038] like Figure 2 and Figure 3As shown, the sealing assembly 20 includes a first rotating ring 21, a first stationary ring 22, a second rotating ring 23, and a second stationary ring 24. The first rotating ring 21 and the second rotating ring 23 are respectively mounted on the bushing 11 and rotate with the bushing 11. The first stationary ring 22 and the second stationary ring 24 are respectively slidably mounted on the base 12. The first stationary ring 22 abuts against the first rotating ring 21, and the first inlet 121 and the first outlet 122 are both corresponding to the first stationary ring 22. The second stationary ring 24 abuts against the second rotating ring 23, and the second inlet 123 and the second outlet 124 are both corresponding to the second stationary ring 24. The sealing medium drives the first stationary ring 22 to slide towards the first rotating ring 21, and the second stationary ring 24 to slide towards the first rotating ring 21, thereby causing the first stationary ring 22 to abut against the first rotating ring 21, and the second stationary ring 24 to abut against the first rotating ring 21. Optionally, gaps are provided between the first rotating ring 21 and the base 12, and between the second rotating ring 23 and the base 12, to allow for the flow of cooling medium.

[0039] In one embodiment, the sealing assembly 20 further includes a fixing seat 25, which is installed inside the base 12. The bushing 11 passes through the fixing seat 25, and one side of the second stationary ring 24 abuts against the fixing seat 25. Optionally, there are two sealing cavities 127. One sealing cavity 127 is formed by the base 12 and the first stationary ring 22, and the other sealing cavity 127 is formed by the base 12, the fixing seat 25, and the second stationary ring 24. Further, the cooling cavity 128 is formed by the base 12, the end of the first stationary ring 22 near the first moving ring 21, the end of the second stationary ring 24 near the second moving ring 23, and the fixing seat 25.

[0040] like Figure 3As shown, the sealing assembly 20 also includes a first sealing ring 26, a second sealing ring 27, a third sealing ring 28, and a fourth sealing ring 29. The first sealing ring 26 is installed on the first stationary ring 22 and is used to seal the first stationary ring 22 and the base 12. Optionally, there are two first sealing rings 26, which are respectively installed on both sides of the first stationary ring 22 to ensure the seal between the first stationary ring 22 and the base 12, so as to prevent the sealing medium from flowing into the cooling chamber 128. The second sealing ring 27 is installed on the first rotating ring 21 and is used to seal the first rotating ring 21 and the base 12. The bushing 11; a third sealing ring 28 is installed on the second stationary ring 24, and the third sealing ring 28 is used to seal the second stationary ring 24 and the base 12. Optionally, there are two third sealing rings 28, which are respectively installed on both sides of the second stationary ring 24. One third sealing ring 28 seals the second stationary ring 24 and the base 12, and the other third sealing ring 28 seals the second stationary ring 24 and the fixed seat 25 to prevent the sealing medium from flowing into the cooling chamber 128; a fourth sealing ring 29 is installed on the second rotating ring 23, and the fourth sealing ring 29 is used to seal the second rotating ring 23 and the bushing 11. The sealing assembly 20 also includes a fifth sealing ring 29a, which is installed on the fixed seat 25 and is used to seal the base 12 and the fixed seat 25 to prevent the sealing medium from leaking.

[0041] like Figure 2 and Figure 4 As shown, the mechanical seal device 100 of this rotating shaft also includes a positioning ring 30, which is installed on the end of the bushing 11 away from the limiting ring 15. The positioning ring 30 is housed in the material body to be sealed. Optionally, the positioning ring 30 is provided with a plurality of guide grooves 31. The positioning ring 30 is used to push the material away to prevent the material from entering the machine base 12. Further, the guide grooves 31 are arranged in an arc shape.

[0042] In use, sealing medium is simultaneously introduced into sealing cavity 127 through first inlet 121 and second inlet 123, while cooling medium is introduced into cooling cavity 128 through cooling inlet 125. Furthermore, the pressure in sealing cavity 127 is greater than the pressure in cooling cavity 128, causing the sealing medium to push first stationary ring 22 towards first moving ring 21 and second stationary ring 24 towards second moving ring 23, until first stationary ring 22 abuts against first moving ring 21 and second stationary ring 24 abuts against second moving ring 23, thus achieving a seal. The cooling medium cools first moving ring 21, second moving ring 23, and bushing 11. When the material body is filled with a solid-liquid mixture, solid material may enter the machine base 12 through the gap between the machine base 12 and bushing 11; therefore, cleaning is required.

[0043] like Figure 5 and Figure 6As shown, when cleaning is required, the bushing 11 stops operating, the first inlet 121 and the second inlet 123 stop inputting sealing medium, the cooling outlet 126 stops outputting cooling medium, and the cooling inlet 125 continues to input cooling medium. Part of the cooling medium flows through the gap between the first moving ring 21 and the base 12, thereby forcing the first stationary ring 22 to slide away from the first moving ring 21. Part of the cooling medium flows through the gap between the second moving ring 23 and the base 12, thereby forcing the second stationary ring 24 to slide away from the second moving ring 23. This further cools the gap between the first stationary ring 22 and the first moving ring 21, and the second stationary ring 24. The gap between ring 24 and the second moving ring 23 is flushed or purged to prevent material from accumulating on the mating surfaces of the first stationary ring 22 and the first moving ring 21, and the second stationary ring 24 and the second moving ring 23, which would prevent the stationary ring and the moving ring from fitting together. This ensures that material impurities do not damage the mating surfaces of the stationary ring and the moving ring, thus extending their service life. Some of the cooling medium and solid material then flow back into the material body to be sealed from the gap between the bushing 11 and the base 12, and some of the cooling medium and solid material then flow out from the gap between the bushing 11 and the fixed seat 25, and finally flow out from the gap between the bushing 11 and the bearing 13, and the gap between the base 12 and the bearing 13.

[0044] The mechanical seal device 100 of this utility model achieves sealing by having the first stationary ring 22 abut against the first moving ring 21 and the second stationary ring 24 abut against the second moving ring 23 through the sealing medium; the mechanical seal device 100 of this utility model has good sealing effect and long service life.

[0045] Please refer to Figure 7 This invention relates to a sealing device 200, comprising the aforementioned rotary shaft mechanical seal device 100. In one embodiment, the sealing medium mechanism 80 includes a storage tank 81, an air valve 82, a feed pipe 83, a return pipe 84, multiple valves 85, and multiple pressure gauges 86. The storage tank 81 stores the sealing medium. The air valve 82 is installed on the storage tank 81. One end of the feed pipe 83 is connected to the storage tank 81, and the other end is connected to a first inlet 121 and a second inlet 123. One end of the return pipe 84 is connected to the storage tank 81, and the other end is connected to a first outlet 122 and a second outlet 124. Valves 85 and pressure gauges 86 are installed on both the feed pipe 83 and the return pipe 84. The air valve 82 controls the input of the air source to the storage tank 81, the valve 85 controls the operation of the feed pipe 83 or the return pipe 84, and the pressure gauges 86 control the air pressure of the feed pipe 83 or the return pipe 84. Optionally, the storage tank 81 is used to store the sealing medium, which is one of the liquid components in the material body, ordinary liquid, or gas. When the sealing medium is an ordinary liquid or a liquid component in the material body, the storage tank 81 needs to be supplied with inert gas. The inert gas is used to generate pressure for the sealing medium in the sealing cavity, thereby driving the stationary ring to slide. Furthermore, both the gas valve 82 and the valve 85 have automatic opening and closing functions, and the pressure gauge 86 has a signal feedback function, which is the prior art.

[0046] In one embodiment, the cooling medium mechanism 90 includes a cooling tank 91, a switch 92, an input pipe 93, an output pipe 94, multiple control valves 95, and multiple control gauges 96. The cooling tank 91 stores the cooling medium. The switch 92 is installed on the cooling tank 91. One end of the input pipe 93 is connected to the cooling tank 91, and the other end is connected to the cooling inlet 125. One end of the output pipe 94 is connected to the cooling tank 91, and the other end is connected to the cooling outlet 126. Control valves 95 and control gauges 96 are installed on both the input pipe 93 and the output pipe 94. The switch 92 controls the input of the air source to the cooling tank 91, the control valves 95 control the operation of the input pipe 93 or the output pipe 94, and the control gauges 96 control the air pressure of the input pipe 93 or the output pipe 94. Optionally, the cooling medium is a gas or a liquid component in a material body. When the cooling medium is a liquid component in a material body, an inert gas needs to be introduced into the cooling tank 91 to generate pressure for the cooling medium in the cooling chamber. Furthermore, both switch 92 and control valve 95 have automatic opening and closing functions, and control meter 96 has signal feedback function, which is existing technology.

[0047] In one embodiment, a control component (not shown) is also included. The control component includes a sensor and a controller. The sensor is installed inside the material to be sealed. The sensor, air valve 82, valve 85, pressure gauge 86, switch 92, control valve 95, and control gauge 96 are all signal-connected to the controller. When the sensor detects a change in pressure inside the material to be sealed, the controller adjusts the pressure of the storage tank 81, feed pipe 83, return pipe 84, cooling tank 91, input pipe 93, and output pipe 94.

[0048] During use, the pressure of storage tank 81 is automatically adjusted by the controller to a preset value greater than the pressure of the material to be sealed. For example, if the preset value is that the pressure of storage tank 81 is 0.05 MPa greater than the pressure of the material, the air valve 82 is closed. At the same time, the pressure of cooling tank 91 is less than that of storage tank 81, and valve 85 is opened, allowing the sealing medium to flow into the sealing cavity. This forces the first stationary ring to abut against the first rotating ring, and the second stationary ring to abut against the second rotating ring, thus achieving a seal. During cleaning, the bushing stops, and storage tank 81, feed pipe 83, and return pipe 84 cease operation. Cooling tank 91 and input pipe 93 are opened, thereby moving the first stationary ring away from the first rotating ring and the second stationary ring away from the second rotating ring, flushing or blowing away impurities between the first stationary ring and the first rotating ring, and between the second stationary ring and the second rotating ring.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mechanical seal device for a rotating shaft, characterized in that, The system includes a support assembly and a sealing assembly. The support assembly includes a bushing and a base. The bushing passes through the base, which has a first inlet, a first outlet, a second inlet, and a second outlet. One end of the first inlet is connected to the first outlet, and the other end is connected to a sealing medium mechanism. One end of the second inlet is connected to the second outlet, and the other end is connected to the sealing medium mechanism. The sealing assembly includes a first rotating ring, a first stationary ring, a second rotating ring, and a second stationary ring. The first rotating ring and the second rotating ring are respectively mounted on the bushing, and the first stationary ring and the second stationary ring are respectively slidably disposed on the base. The first stationary ring abuts against the first rotating ring, and the first inlet and the first outlet are both corresponding to the first stationary ring. The second stationary ring abuts against the second rotating ring, and the second inlet and the second outlet are both corresponding to the second stationary ring.

2. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The base is provided with a cooling inlet and a cooling outlet. The cooling inlet is connected to the cooling outlet. The cooling inlet is located between the first inlet and the second inlet. The cooling outlet is located between the first outlet and the second outlet. One end of the cooling inlet is connected to the cooling outlet, and the other end is connected to the cooling medium mechanism. One end of the cooling outlet is connected to the cooling medium mechanism.

3. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The sealing assembly further includes a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring. The first sealing ring is installed on the first stationary ring and is used to seal the first stationary ring and the machine base. The second sealing ring is installed on the first rotating ring and is used to seal the first rotating ring and the bushing. The third sealing ring is installed on the second stationary ring and is used to seal the second stationary ring and the machine base. The fourth sealing ring is installed on the second rotating ring and is used to seal the second rotating ring and the bushing.

4. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The sealing assembly also includes a fixing seat, which is installed inside the machine base. The bushing passes through the fixing seat, and one side of the second stationary ring abuts against the fixing seat.

5. The mechanical seal device for a rotating shaft according to claim 4, characterized in that, The sealing assembly further includes a fifth sealing ring, which is installed on the fixed base and is used to seal the base and the fixed base.

6. The mechanical seal device for a rotating shaft according to claim 1, characterized in that, The support assembly also includes a bearing and a pressure cap. The bearing is installed inside the machine base and is sleeved on the outside of the bushing. The pressure cap is installed on the machine base, and one end of the pressure cap abuts against the outer ring of the bearing.

7. The mechanical seal device for a rotating shaft according to claim 6, characterized in that, The support assembly also includes a limiting ring, which is installed on the bushing, with one end of the limiting ring abutting against the inner ring of the bearing.

8. The mechanical seal device for a rotating shaft according to claim 7, characterized in that, It also includes a positioning ring, which is installed at the end of the bushing away from the limiting ring; the positioning ring is provided with multiple guide grooves.

9. A sealing device, characterized in that, The rotating shaft mechanical seal device includes any one of claims 1-8.

10. The sealing device according to claim 9, characterized in that, The sealing medium mechanism includes a storage tank, an air valve, a feed pipe, a return pipe, multiple valves, and multiple pressure gauges. The storage tank is used to store the sealing medium. The air valve is installed in the storage tank. One end of the feed pipe is connected to the storage tank, and the other end is connected to the first inlet and the second inlet. One end of the return pipe is connected to the storage tank, and the other end is connected to the first outlet and the second outlet. The valve and the pressure gauge are installed on both the feed pipe and the return pipe.

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