High-temperature and high-pressure dry gas sealing structure

Abstract

The utility model discloses a high-temperature and high-pressure dry gas sealing structure which comprises two movable rings arranged on the two sides of the outer end of a shaft sleeve and rotating along with the shaft sleeve. The two static rings are arranged at the two ends of the outer side of the movable ring; one end of each push ring is in contact with the static ring, the other end of each push ring is connected with the static ring seat through a spring to enable the static ring to be close to the moving ring, sealing gas is introduced between the moving ring and the static ring, the springs are extruded through the sealing gas to enable the moving ring and the static ring to be separated, and a gap for gas to penetrate through is kept between the static ring and the moving ring; the push ring is of an inverted-T-shaped structure, the two sides of the vertical end of the push ring are connected with the spring and the end of the static ring respectively, the horizontal end of the push ring is connected with the inner side of the end of the static ring and the inner side of the end of the static ring seat in a sealed mode respectively, and a channel is formed between the horizontal end of the push ring and the pressing sleeve and communicated with a gap between the static ring and the movable ring. According to the sealing structure, the spring on the outer side of the push ring is combined with sealing gas to form dry gas sealing, the push ring is arranged to be inverted-T-shaped, the sealing effect can be improved, and the sealing quality is prevented from being affected by too high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing equipment, in particular to a high-temperature and high-pressure dry gas sealing structure. Background Art

[0002] The existing carrier gas compressor has a shaft diameter of 160mm, a medium of 69.45% NH3, 29.69% C02, 0.06% H0CN, 0.8% N2, a temperature of 160℃, a pressure of 4MPa, a speed of 8300rpm, and a set of imported double-end dry gas seals are installed on the drive end and the non-drive end of the compressor. In actual production operation, the sealing effect is relatively obvious at the beginning. After a period of operation, as the temperature and pressure increase when the unit is started and stopped, the sealing effect decreases significantly, the leakage of the main seal gas increases, and the pressure difference between the main seal gas, the front gas and the process gas decreases or even disappears. As the leakage increases, the leaked process gas enters the bearing box, affecting the quality of the oil. At the same time, a large amount of NH3 leaks in the medium, seriously affecting the surrounding environment. When the environmental protection requirements and safety requirements are not met, the entire device will be shut down. The compressor is forced to stop for maintenance, which causes great difficulties for the stable operation of the device. In order to ensure the long-term operation of the device, extend the service life of the compressor dry gas seal, reduce the number of compressor maintenance, and save maintenance costs, the compressor dry gas seal needs to be modified.

[0003] After analyzing the dry gas seal structure of the existing compressor, it was found that the internal push ring is in the shape of a flat plate. When the push ring is connected to the static ring and the static ring seat, it is necessary to ensure both radial sealing and axial sealing. Therefore, the product processing requirements for the push ring are relatively high. Utility Model Content

[0004] Therefore, in order to solve the above-mentioned deficiencies, the utility model provides a high-temperature and high-pressure dry gas sealing structure. The sealing structure sets the push ring in a T-shape. After installation, the vertical end of the push ring directly connects the two ends of the stationary ring and the stationary ring seat, while the horizontal end maintains a sealed connection with the inner side of the end of the stationary ring and the stationary ring seat. In actual use, it is only necessary to ensure axial sealing. It has better floating and tracking properties and is not affected by temperature and pressure, thereby effectively reducing the processing requirements of the sealing ring.

[0005] The utility model is realized by constructing a high-temperature and high-pressure dry gas sealing structure, comprising two dynamic rings, which are arranged on both sides of the outer end of the shaft sleeve and rotate with the shaft sleeve;

[0006] Two static rings are arranged on both ends of the outer side of the dynamic ring;

[0007] Two push rings, one end of which contacts the stationary ring, and the other end is connected to the stationary ring seat through a spring, the spring pushes the push ring and the stationary ring close to the dynamic ring, a sealing gas is passed between the dynamic ring and the stationary ring, and the sealing gas squeezes the spring to separate the dynamic ring and maintain a gap between the stationary ring and the dynamic ring for gas to pass through;

[0008] The outer side of the stationary ring seat is connected with a comb-tooth sealing structure, and compression sleeves are respectively arranged at the two ends of the shaft sleeve. The comb-tooth sealing structure is connected to the stationary ring seat through a fastener, and the comb-tooth part of the inner hole is outside the locking nut and the compression sleeve to form a tooth gap;

[0009] The push ring has an inverted T-shaped structure, with its vertical ends connected to the ends of the spring and the static ring on both sides, and its horizontal ends sealed to the inner sides of the ends of the static ring and the static ring seat respectively. There is a channel between the horizontal end of the push ring and the clamping sleeve, and the channel is connected to the gap between the static ring and the dynamic ring.

[0010] Specifically, an intermediate connecting piece is provided on the outer side of the two moving rings, and the intermediate connecting piece connects the static ring seats on the outer sides of the two moving rings. A sealing gas inlet for the entry of sealing gas is also provided on the intermediate connecting piece, and the sealing gas inlet is respectively connected to the gaps between the two moving rings and the two static rings.

[0011] Specifically, the outer circle of the stationary ring is provided with several concave arcs, and the corresponding part on the stationary ring seat is provided with connecting holes corresponding to the concave arcs. The stationary ring and the stationary ring seat are connected by anti-rotation pins passing through the concave arcs and the connecting holes respectively.

[0012] Specifically, a pressure plate is installed at the outer end of the stationary ring seat through fasteners to prevent the stationary ring and the stationary ring seat from separating, and the stationary ring seats outside the two stationary rings are connected to the intermediate connecting piece through fasteners.

[0013] Specifically, a vibration-damping belt is provided between the moving ring and the shaft sleeve.

[0014] Specifically, a spring actuating ring is arranged inside the horizontal end of the push ring and the end of the stationary ring seat, and the junction between the horizontal end and the vertical end of the push ring is sealed and connected with the stationary ring through an O-ring.

[0015] Specifically, the dynamic ring and the shaft sleeve are sealed and connected via an O-ring.

[0016] Specifically, the stationary ring seat includes an outer stationary ring seat and an inner stationary ring seat, the compression sleeve includes an outer compression sleeve and an inner compression sleeve, the outer stationary ring seat and the outer compression sleeve are respectively arranged at the outer end of any one stationary ring, and the inner stationary ring seat and the inner compression sleeve are respectively arranged at the outer end of the other stationary ring.

[0017] Specifically, the comb tooth sealing structure includes two comb teeth and an outer comb tooth seat, the comb teeth are divided into outer comb teeth and inner comb teeth, one end of the outer comb teeth is arranged on the outer end of the locking nut, and the other end is connected to the outer stationary ring seat through the outer comb tooth seat, one end of the inner comb teeth is arranged on the outer side of the inner compression sleeve, and the other end is connected to the inner stationary ring seat, and the tooth gaps of the outer comb teeth and the inner comb teeth are respectively connected to the channels.

[0018] Specifically, an isolation gas inlet is provided on the outer comb tooth seat, and the isolation gas inlet is connected to the outside or the channel between the horizontal end of the push ring and the clamping sleeve through the tooth gap of the outer comb teeth. A leakage observation port connected to the channel is provided on the outer stationary ring seat, and a front gas inlet connected to the channel is provided on the inner stationary ring seat, and the front gas inlet is connected to the external equipment through the tooth gap of the inner comb teeth.

[0019] The utility model has the following beneficial effects:

[0020] The sealing structure eliminates the processing requirements of the original structure that requires a push ring and an O-ring to simultaneously achieve radial and axial sealing by providing an inverted T-shaped push ring, thereby reducing the processing difficulty. At the same time, a spring actuating ring is provided as a seal, thereby reducing the influence of temperature and pressure and achieving long-cycle operation. The structure is easy to install and reliable to use, reduces the frequency of maintenance and on-site environmental pollution, increases the service life of the equipment, and ensures smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the specific implementation of the present invention, they are used to explain the present invention, but do not constitute any limitation to the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the push ring connection in the existing dry gas seal structure;

[0023] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0024] Figure 3 yes Figure 2 The structure diagram of the dynamic ring in the A direction;

[0025] Figure 4 yes Figure 2 The structure diagram of the dynamic ring in the B direction;

[0026] Figure 5 yes Figure 2 A partial enlarged schematic diagram of point C in the middle;

[0027] Figure 6 This is a schematic diagram of the installation of the dynamic ring and the shaft sleeve in the utility model (where the upper and lower ends of the connection part are flat);

[0028] Figure 7 It is a schematic diagram of the installation of the static ring, the anti-rotation pin and the pressure plate in the utility model;

[0029] Figure 8 This is a schematic diagram of the installation structure of the medium pressure plate of the utility model;

[0030] Fig. 9 It is a structural schematic diagram of the gas source inlet and outlet in the utility model;

[0031] In the figure: 1-locking nut, 2-external comb teeth, 3-external comb tooth seat, 4-external static ring seat, 5-external compression sleeve, 6-push ring, 7-static ring, 8-shaft sleeve, 9-dynamic ring, 10-intermediate connecting piece, 11-vibration damping belt, 12-pressure plate, 13-anti-rotation pin, 14-inner compression sleeve, 15-spring, 16-inner static ring seat, 17-inner comb teeth, 18-adjusting pad, 19-positioning block, 20-spring actuating ring, 21-front air inlet, 22-sealing air inlet, 23-isolating air inlet, 24-leakage observation port. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further specifically described below through specific embodiments in combination with the accompanying drawings; it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not intended to limit the present invention in any way; the accompanying drawings in the present invention are only used to assist in the description of the embodiments and to facilitate understanding, and are not intended to limit the present invention in any way.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] As described in the background technology, the existing dry gas sealing structure has poor sealing effect due to the increase of temperature and pressure, that is, the sealing ring produced by the existing production process cannot meet the equipment requirements when working at high temperature and high pressure.

[0035] For the reasons stated above, please refer to the attached Figure 1 The utility model provides a high-temperature and high-pressure dry gas sealing structure, comprising two dynamic rings 9, which are arranged on both sides of the outer end of the sleeve 8 and rotate with the sleeve 8;

[0036] Two stationary rings 7 are arranged on both ends of the outer side of the moving ring 9;

[0037] Two push rings 6, one end of which is in contact with the stationary ring 7, and the other end of which is connected to the stationary ring seat through a spring 15. The spring 15 pushes the push ring 6 and the stationary ring 7 to approach the dynamic ring 9. A sealing gas is passed between the dynamic ring and the stationary ring 7. The sealing gas squeezes the spring 15 to separate the dynamic ring 9 and keep a gap between the stationary ring 7 and the dynamic ring 9 for gas to pass through.

[0038] The outer side of the stationary ring seat is connected with a comb-tooth sealing structure, and compression sleeves are respectively arranged at the two ends of the shaft sleeve 8. The comb-tooth sealing structure is connected to the stationary ring seat through fasteners, and the comb-tooth part of the inner hole is outside the locking nut and the compression sleeve to form a tooth gap;

[0039] The push ring 6 is in an inverted T-shaped structure, and its vertical ends are respectively connected to the ends of the spring 15 and the static ring 7, and its horizontal ends are respectively sealed and connected to the inner sides of the ends of the static ring 7 and the static ring seat. There is a channel between the horizontal end of the push ring 6 and the clamping sleeve, and the channel is connected to the gap between the static ring 7 and the dynamic ring 9.

[0040] Specifically, an intermediate connecting piece 10 is provided on the outer side of the two moving rings 9, and the intermediate connecting piece 10 connects the static ring seats on the outer sides of the two moving rings 9. A sealing gas inlet 22 for the entry of sealing gas is also provided on the intermediate connecting piece 10, and the sealing gas inlet 22 is respectively connected to the gaps between the two moving rings 9 and the two static rings 7.

[0041] Specifically, the outer circular portion of the stationary ring 7 is provided with several concave arcs, and the corresponding portion on the stationary ring seat is provided with connecting holes corresponding to the concave arcs. The stationary ring 7 and the stationary ring seat are connected by an anti-rotation pin 13 that passes through the concave arcs and the connecting holes respectively.

[0042] Specifically, a pressure plate 12 is installed at the outer end of the stationary ring seat through fasteners to prevent the stationary ring 7 and the stationary ring seat from separating. The stationary ring seats outside the two stationary rings 7 are connected to the intermediate connecting piece 10 through fasteners (ie screws).

[0043] Specifically, a vibration-damping belt 11 is sleeved between the dynamic ring 9 and the shaft sleeve 8 .

[0044] Specifically, a spring actuating ring 20 is provided inside the horizontal end of the push ring 6 and the end of the stationary ring seat, and the junction between the horizontal end and the vertical end of the push ring 6 is sealed and connected with the stationary ring 7 through an O-ring.

[0045] Specifically, the dynamic ring 9 and the shaft sleeve 8 are sealed and connected via an O-ring.

[0046] Specifically, the stationary ring seat includes an outer stationary ring seat 4 and an inner stationary ring seat 16, the compression sleeve includes an outer compression sleeve 5 and an inner compression sleeve 14, the outer stationary ring seat 4 and the outer compression sleeve 5 are respectively arranged at the outer end of any one stationary ring 7, and the inner stationary ring seat 16 and the inner compression sleeve 14 are respectively arranged at the outer end of another stationary ring 7.

[0047] Specifically, the comb tooth sealing structure includes two comb teeth and an outer comb tooth seat 3, the comb teeth are divided into outer comb teeth 2 and inner comb teeth 17, one end of the outer comb teeth 2 is arranged on the outer end of the locking nut 1, and the other end is connected to the outer stationary ring seat 4 through the outer comb tooth seat 3, one end of the inner comb teeth 17 is arranged on the outer side of the inner compression sleeve 14, and the other end is connected to the inner stationary ring seat 16, and the tooth gaps of the outer comb teeth 2 and the inner comb teeth 17 are respectively connected to the channels.

[0048] Specifically, an isolation gas inlet 23 is provided on the outer comb tooth seat 3, and the isolation gas inlet 23 is connected to the outside or the channel between the horizontal end of the push ring 6 and the clamping sleeve through the tooth gap of the outer comb teeth 2. A leakage port 24 connected to the channel is provided on the outer stationary ring seat 4, and a front gas inlet 21 connected to the channel is provided on the inner stationary ring seat 16, and the front gas inlet 21 is connected to the external equipment through the tooth gap of the inner comb teeth 17.

[0049] Specifically, a positioning block 19 is also provided on the upper outer side of the outer comb tooth seat 3.

[0050] The dry gas seal structure designed in this paper adopts a face-to-face structure (i.e., a sealing structure is set at both ends of the inner and outer ends). The spring 15 is installed on the outer side of the mechanical seal end face. The two moving rings 9 are matched with the inner flat square of the sleeve 8 through the outer circle of the flat square to realize transmission (by the attached Figure 6 As can be seen), the sleeve 8 is fixed on the shaft by the locking nut 1, and the compression length of the dry gas seal spring is adjusted by the adjustment pad 18 between the sleeve 8 and the compressor shoulder. The two static rings 7 are pushed by the spring to push the push ring 6 to ensure the fitting of the sealing surface. In particular, the design of the push ring 6 has changed the previous straight strip, and the O-ring seals and floats on the groove inside the static ring seat. The push ring 6 is designed into an inverted T shape, which has better floating and tracking properties and is not affected by temperature and pressure. In the previous design (that is, the push ring 6 is a straight strip), the O-ring in the push ring must achieve radial and axial bidirectional sealing at the same time, which has high requirements for product processing. The current design only needs to achieve axial sealing, which reduces the processing difficulty of the push ring 6 and achieves good economy. At the same time, it also improves the processing technology of the static ring seat and reduces the processing difficulty of the static ring seat. In addition, a spring actuating ring 20 is used as a seal between the push ring and the static ring seat, which can almost ignore the influence of temperature and pressure and achieve long-term operation. The same design uses metal steel belts (i.e., vibration-damping belts 11) between the dynamic ring 9 and the shaft sleeve 8, and between the shaft sleeve 8 and the equipment shaft to reduce vibration, and also takes the influence of temperature into consideration to achieve long-cycle operation.

[0051] During installation

[0052] Dynamic ring part: Two dynamic rings 9 are installed on the shaft sleeve 8, sealed by O-rings, and vibration-reducing belts 11 between the shaft sleeve 8. The inner and outer flat squares cooperate to achieve transmission, and then several screws are used to tighten through the inner and outer compression sleeves to fix them on the shaft sleeve 8 to prevent them from falling off during high-speed rotation. The sealing end face of the dynamic ring is designed with a spiral shallow groove according to the rotation direction (by the attached Figure 3 and attached Figure 4 It can be seen that when rotating at high speed, gas can be pumped into the sealing end faces to form an air film, thereby realizing the non-contact operation of the mechanical seal ring and ensuring long-term operation.

[0053] Static ring part: The two static rings 7 close to the two dynamic rings 9 are axially sealed by the push ring 6 through the O-ring, and the thrust is provided by several springs 15 installed in the inner and outer static ring seats to ensure the floating of the two static rings 7. At the same time, the radial seal between the push ring 6 and the static ring seat with an inverted T-shaped design adopts a spring actuating ring 20, in which the sealing force is provided by a metal steel belt, which is almost unaffected by temperature and pressure. This push ring with a separate design has better floating and tracking properties, and also reduces the difficulty of processing parts, and can achieve long-term operation. At the same time, the several concave arcs designed on the outer circle of the two static rings 7 are anti-rotated by several anti-rotation pins 13 installed in the inner and outer static ring seats. The pressure plate 12 is installed on the static ring seat outside the static ring 7 with several screws to prevent the static ring 7 from withdrawing; and the inner and outer static ring seats are connected into a whole through the intermediate connector 10 with several screws. There are several O-rings on the outer circle of the inner and outer static ring seats and the outer comb tooth seat 3 for sealing on the inner wall of the equipment cavity.

[0054] Comb tooth part: Use several screws to fix the inner comb teeth 17 on the inner static ring seat 16 through the O-ring; use several screws to seal the outer comb tooth seat 3 through the O-ring and fix it on the outer static ring seat 4; use several screws to fix the outer comb teeth 2 on the outer comb tooth seat 3.

[0055] On-site installation: The positioning block 19 is stuck in the equipment groove and fixed on the outer static ring seat of the mechanical seal with screws, so that the static ring part is fixed in the equipment cavity; the left and right distances are adjusted by adjusting the spacer 18 to fully ensure the compression length of the spring 15 to achieve the designed spring force, and the locking nut 1 is tightened on the equipment shaft through the O-ring to fix the dynamic ring part on the equipment shaft. The shaft sleeve 8 and the equipment shaft are also sealed with an O-ring, and two vibration-damping belts are used for vibration reduction.

[0056] On-site use: When in use, the front air enters the inner mechanical seal through the hole (i.e., the front air inlet 21) opened on the inner static ring seat 16, and enters the compressor through the narrow channel between the inner comb teeth 17 and the inner compression sleeve 14, so as to prevent the dirt in the process medium from entering between the sealing end faces and affecting the use of the mechanical seal; the sealing air enters between the inner and outer mechanical seals through several air holes (i.e., the sealing air inlet 22) opened on the circumference of the intermediate connecting piece 10, and the high-pressure sealing gas on the outer diameter side is pumped into between the sealing end faces by the spiral groove on the end face of the high-speed rotating dynamic ring 9. The opening pressure formed by the end face film pressure is balanced with the closing force formed by the medium pressure acting on the back of the sealing ring and the spring force, and an air film is formed between the end faces of the sealing ring, thereby realizing non-contact operation of the seal. The formed air film completely blocks the leakage channel of the relatively low-pressure sealing medium, realizing zero sealing medium. Leakage and zero escape; the isolation gas enters the several through holes on the outer comb teeth 2 through the holes (isolation gas inlet 23) opened on the outer comb tooth seat 3, enters between the outer comb teeth 2, and then flows to the inner and outer sides respectively through the narrow channel between the outer comb teeth 2 and the outer compression sleeve 5 (i.e. the tooth gap of the comb teeth). The outer channel is used to prevent the oil mist in the bearing box from entering the outer sealing end face and affecting the use of the machine seal. The inner channel is used to prevent the medium gas escaping from abnormal operation of the machine seal from entering the outer bearing box and contaminating the oil. A leakage observation port 24 is provided on the outer static ring seat 4, and a small amount of isolation gas usually escapes through the leakage observation port 24 on the outside of the outer machine seal. When the machine seal operates abnormally and leakage occurs, the leakage gas can be guided out of this hole through the isolation gas to avoid environmental pollution. In addition, the equipment emergency treatment can be carried out in advance through the monitoring of the leakage gas to ensure the safe operation of the equipment.

[0057] In actual assembly, priority is given to assembling ① the inner and outer static ring components: install the anti-rotation pin 13 and the spring 15 into the inner and outer static ring seats, install the spring retaining ring 20 into the groove, install the push ring 6, pay attention to the floating between the push ring 6 and the static ring seat, press it several times by hand, install the O-ring into the push ring groove, install the anti-rotation pin 13 corresponding to the concave arc of the static ring 7, and fix the pressure plate with screws; ② the dynamic ring assembly: install the dynamic ring sealing O-ring and the vibration damping belt 11 on the shaft sleeve, install the two dynamic rings 9, pay attention to the compression between the dynamic ring 9 and the vibration damping belt 11, and then use screws to install the inner and outer compression sleeves at both ends of the shaft sleeve 8. Fix the two moving rings 9, and be careful not to crush the moving rings 9 when fixing; ③ Install the moving ring assembly into the inner static ring assembly (that is, the static ring assembly close to the inner static ring seat), and install the intermediate connector 10 and the outer static ring assembly in turn, and connect them into a whole with screws; ④ Install the O-ring in the groove of the inner comb tooth 17, and fix it on the inner static ring seat 16 with screws; Install the O-ring in the groove of the outer comb tooth seat 3, and fix it on the outer static ring seat 4 with screws, and install the O-ring in the outer comb tooth 2, and fix it on the outer comb tooth seat with screws; ⑤ Adjust the gasket 18, positioning block 19 and mounting screws that are randomly sealed for use when installing on site.

[0058] Note: In actual transportation, in order to prevent damage to the machine seal, the locking nut and the outer comb teeth are not installed on the machine seal. When the random seal is installed on site, the outer comb tooth seat and the outer compression sleeve will be fixed together using transportation tooling.

[0059] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A high temperature and high pressure dry gas sealing structure, characterized in that: include Two moving rings are arranged on both sides of the outer end of the sleeve and rotate with the sleeve; Two static rings are arranged on both ends of the outer side of the dynamic ring; Two push rings, one end of which contacts the stationary ring, and the other end is connected to the stationary ring seat through a spring, the spring pushes the push ring and the stationary ring close to the dynamic ring, a sealing gas is passed between the dynamic ring and the stationary ring, and the sealing gas squeezes the spring to separate the dynamic ring and maintain a gap between the stationary ring and the dynamic ring for gas to pass through; The outer side of the stationary ring seat is connected with a comb-tooth sealing structure, and compression sleeves are respectively arranged at the two ends of the shaft sleeve. The comb-tooth sealing structure is connected to the stationary ring seat through a fastener, and the comb-tooth part of the inner hole is outside the locking nut and the compression sleeve to form a tooth gap; The push ring has an inverted T-shaped structure, with its vertical ends connected to the ends of the spring and the static ring on both sides, and its horizontal ends sealed to the inner sides of the ends of the static ring and the static ring seat respectively. There is a channel between the horizontal end of the push ring and the clamping sleeve, and the channel is connected to the gap between the static ring and the dynamic ring.

2. A high temperature and high pressure dry gas sealing structure according to claim 1, characterized in that: An intermediate connecting piece is arranged on the outer side of the two moving rings, and the intermediate connecting piece connects the static ring seats on the outer sides of the two moving rings. A sealing gas inlet for the entry of sealing gas is also opened on the intermediate connecting piece, and the sealing gas inlet is respectively connected to the gaps between the two moving rings and the two static rings.

3. A high temperature and high pressure dry gas sealing structure according to claim 2, characterized in that: The outer circle of the stationary ring is provided with several concave arcs, and the corresponding part of the stationary ring seat is provided with connecting holes corresponding to the concave arcs. The stationary ring and the stationary ring seat are connected by anti-rotation pins passing through the concave arcs and the connecting holes respectively.

4. A high temperature and high pressure dry gas sealing structure according to claim 3, characterized in that: A pressure plate is also installed at the outer end of the stationary ring seat through fasteners to prevent the stationary ring and the stationary ring seat from separating. The stationary ring seats outside the two stationary rings are connected to the intermediate connecting piece through fasteners.

5. The high temperature and high pressure dry gas sealing structure according to claim 1, characterized in that: A vibration-damping belt is also sleeved between the moving ring and the shaft sleeve.

6. The high temperature and high pressure dry gas sealing structure according to claim 1, characterized in that: A spring actuating ring is arranged inside the horizontal end of the push ring and the end of the stationary ring seat, and the junction between the horizontal end and the vertical end of the push ring is sealed and connected with the stationary ring through an O-ring.

7. The high temperature and high pressure dry gas sealing structure according to claim 1, characterized in that: The moving ring and the shaft sleeve are sealed and connected via an O-ring.

8. The high temperature and high pressure dry gas sealing structure according to claim 1, characterized in that: The stationary ring seat includes an outer stationary ring seat and an inner stationary ring seat, and the compression sleeve includes an outer compression sleeve and an inner compression sleeve. The outer stationary ring seat and the outer compression sleeve are respectively arranged at the outer end of any stationary ring, and the inner stationary ring seat and the inner compression sleeve are respectively arranged at the outer end of the other stationary ring.

9. A high temperature and high pressure dry gas sealing structure according to claim 8, characterized in that: The comb tooth sealing structure includes two comb teeth and an outer comb tooth seat. The comb teeth are divided into outer comb teeth and inner comb teeth. One end of the outer comb teeth is arranged on the outer end of the locking nut, and the other end is connected to the outer static ring seat through the outer comb tooth seat. One end of the inner comb teeth is arranged on the outer side of the inner compression sleeve, and the other end is connected to the inner static ring seat. The tooth gaps of the outer comb teeth and the inner comb teeth are respectively connected to the channels.

10. A high temperature and high pressure dry gas sealing structure according to claim 9, characterized in that: The outer comb tooth seat is provided with an isolation gas inlet, which is connected to the outside or the channel between the horizontal end of the push ring and the clamping sleeve through the tooth gap of the outer comb teeth. The outer stationary ring seat is provided with a leakage observation port connected to the channel. The inner stationary ring seat is provided with a front gas inlet connected to the channel, and the front gas inlet is connected to the external equipment through the tooth gap of the inner comb teeth.

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