Water injection sealing structure for acetylene compressor

Abstract

The utility model discloses a water injection sealing structure for an acetylene compressor, which relates to the field of sealing structures and comprises a shaft sleeve mounted on the axis of the compressor, and a first hot lantern ring mechanism and a second hot lantern ring mechanism which are axially arranged along the axis are sleeved on the outer side of the shaft sleeve. The first hot lantern ring mechanism and the second hot lantern ring mechanism are both connected with a static part of the compressor, gaps exist between the first hot lantern ring mechanism and a shaft sleeve and between the second hot lantern ring mechanism and the shaft sleeve, the first hot lantern ring mechanism is arranged on the medium side, and the second hot lantern ring mechanism is arranged on the atmosphere side. A water filling nozzle is arranged between the first hot lantern ring mechanism and the second hot lantern ring mechanism, annular arc grooves are formed in the inner side annular walls of the first hot lantern ring mechanism and the second hot lantern ring mechanism, the outer side of the shaft sleeve is further sleeved with a third hot lantern ring mechanism, and the third hot lantern ring mechanism is connected with a static part of the compressor. The first hot lantern ring mechanism and the second hot lantern ring mechanism which are provided with the annular arc grooves are matched with the third hot lantern ring mechanism with the spiral grooves, and water is injected into the sealing structure when the shaft sleeve rotates, so that the purposes of efficiently preventing carbon black particles from entering a sealing cavity and prolonging the service life of the sealing structure are achieved.

Description

Technical Field

[0001] The utility model relates to the field of sealing structures, in particular to a water injection sealing structure for an acetylene compressor. Background Art

[0002] The cracking gas screw compressor of the acetylene production unit is a device used to compress acetylene gas, which is usually produced by catalytic cracking of paraffin, and then needs to be compressed to a certain working pressure for subsequent processing, storage or transportation. The cracking gas screw compressor is a special type of screw compressor, which is designed and operated to handle high temperature, high pressure and chemically active gases. Cracking gas screw compressors usually have the following characteristics: Cracking gas screw compressors use the rotational motion of the screw to compress the gas, and achieve gas compression by reducing the volume between the screw groove and the cavity; Since acetylene gas may have high temperature properties during the cracking process, cracking gas screw compressors usually use high temperature resistant materials and special cooling systems to maintain the normal operating temperature of the machine; Acetylene gas has high chemical activity and may participate in reactions and polymerizations. In order to adapt to this characteristic, cracking gas screw compressors usually use corrosion-resistant materials and special sealing structures to reduce the risk of chemical reactions between gas and machine parts; Since acetylene gas is flammable and explosive, cracking gas screw compressors are usually equipped with corresponding safety control systems, including gas detection, leakage alarm and emergency shut-off devices, etc.; Cracking gas screw compressors play an important role in acetylene production devices, and can compress acetylene gas to the required working pressure to ensure the normal operation of the device and the quality of the acetylene gas produced.

[0003] For the cracking gas screw compressor of the acetylene production unit, since the medium contains a large amount of carbon black particles and combined with other operating conditions, its chemical properties are very active and can undergo addition, oxidation, polymerization and metal substitution reactions. It has a strong self-polymerization ability to produce various polymers. Most engineering practices use carbon ring seals, which have a simple structure, are easy to install and maintain, and have good economy, stability and reliability.

[0004] There are usually two common sealing media for carbon ring seals of screw cracking gas compressors: desalted water or nitrogen. Due to the rotation and vibration of the unit rotor, there is a violent relative movement between the carbon ring seal and the shaft during actual operation. The gas-injected carbon ring seal is prone to turbulence in the sealing chamber, resulting in mutual diffusion and mutual penetration of the process medium and the sealing gas. Especially when the medium contains particles, the wear of the seal will be aggravated. In order to prevent the wear from aggravating, it is necessary to increase the actual sealing gas pressure, which will increase the consumption of sealing gas, not only increase the nitrogen component in the medium, but also cannot completely prevent the medium from penetrating into the sealing chamber, shortening the life of the carbon ring seal.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The utility model aims to provide a water injection sealing structure for an acetylene compressor. The water injection sealing structure is provided with a first heat sleeve ring mechanism with an annular arc groove and a second heat sleeve ring mechanism which cooperates with a third heat sleeve ring mechanism with a spiral groove. When the shaft sleeve rotates, water is injected into the sealing structure to solve the problem in the prior art that carbon black particles are easy to enter the sealing cavity, thereby shortening the service life of the sealing structure.

[0007] The utility model embodiment is realized by the following technical scheme: the utility model embodiment provides a water injection sealing structure for an acetylene compressor, comprising a sleeve mounted on the shaft center of the compressor, a first thermal sleeve mechanism and a second thermal sleeve mechanism arranged axially along the shaft center are sleeved on the outer side of the sleeve, the first thermal sleeve mechanism and the second thermal sleeve mechanism are both connected to the stationary part of the compressor, there are gaps between the first thermal sleeve mechanism and the second thermal sleeve mechanism and the sleeve, the first thermal sleeve mechanism is arranged on the medium side, and the second thermal sleeve mechanism is arranged on the atmosphere side;

[0008] A water injection port is provided between the first thermal sleeve ring mechanism and the second thermal sleeve ring mechanism, and an annular arc groove is provided on the inner ring wall of the first thermal sleeve ring mechanism and the second thermal sleeve ring mechanism. When the sealing liquid enters from the water injection port, it will enter the sealing structure along the water injection port. When the shaft center of the compressor drives the shaft sleeve to rotate, the sealing liquid can form a liquid film between the first thermal sleeve ring mechanism and the shaft sleeve, and the sealing liquid can form a liquid film between the second thermal sleeve ring mechanism and the shaft sleeve. When the shaft center of the compressor is stationary, the sealing liquid can form a vortex between the first thermal sleeve ring mechanism and the shaft sleeve and / or between the second thermal sleeve ring mechanism and the shaft sleeve;

[0009] A third thermal sleeve ring mechanism is also sleeved on the outside of the sleeve, which is connected to the stationary part of the compressor and has a gap with the sleeve. The third thermal sleeve ring mechanism is arranged on the atmospheric side of the second thermal sleeve ring mechanism, and a spiral groove is provided on the inner ring wall of the third thermal sleeve ring mechanism. When the shaft center of the compressor drives the sleeve to rotate, the sealing liquid may be subjected to a resistance in the direction of the medium side between the third thermal sleeve ring mechanism and the sleeve.

[0010] Preferably, the first heat-shrinkable carbon ring mechanism comprises a first heat-shrinkable carbon ring and a second heat-shrinkable carbon ring, the first heat-shrinkable carbon ring is arranged beside the second heat-shrinkable carbon ring, and an annular arc groove is provided on the inner ring wall of the first heat-shrinkable carbon ring and the second heat-shrinkable carbon ring.

[0011] Preferably, the second heat-shrink ring mechanism comprises a third heat-shrink carbon ring, and two axially arranged annular arc grooves are provided on the inner ring wall of the third heat-shrink carbon ring.

[0012] Preferably, the third heat-shrink-fit carbon ring mechanism comprises a fourth heat-shrink-fit carbon ring and a fifth heat-shrink-fit carbon ring, the fourth heat-shrink-fit carbon ring is arranged beside the fifth heat-shrink-fit carbon ring, and a spiral groove is provided on the inner ring wall of the fourth heat-shrink-fit carbon ring and the fifth heat-shrink-fit carbon ring.

[0013] Preferably, a first water outlet is provided between the fourth shrink-fit carbon ring and the fifth shrink-fit carbon ring.

[0014] Preferably, an isolation carbon ring is provided on the atmosphere side of the third thermal sleeve ring mechanism. The isolation carbon ring is sleeved on the outside of the shaft sleeve with a gap between the isolation carbon ring and the shaft sleeve. The isolation carbon ring is connected to the stationary part of the compressor.

[0015] Preferably, the isolation carbon ring is composed of three petals, each adjacent petal is connected by a tension spring and combined into a circular ring, and the inner diameter of the circular ring can be changed with the inner diameter of the tension spring.

[0016] Preferably, a second water outlet is provided between the isolation carbon ring and the third thermal sleeve ring mechanism.

[0017] Preferably, a rear pumping effect ring is provided on the atmospheric side of the isolation carbon ring. The rear pumping effect ring is sleeved on the outside of the shaft sleeve and there is a gap between the rear pumping effect ring and the shaft sleeve. The rear pumping effect ring is connected to the stationary part of the compressor, and a spiral groove is provided on the inner ring wall. An air inlet is provided between the isolation carbon ring and the rear pumping effect ring.

[0018] Preferably, a front pump effect ring is provided on the medium side of the first thermal sleeve ring mechanism. The front pump effect ring is sleeved outside the shaft sleeve and connected to the stationary part of the compressor. A spiral groove is provided on the inner ring wall of the front pump effect ring and there is a gap between the front pump effect ring and the shaft sleeve.

[0019] Compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0020] The utility model provides a water injection sealing structure for an acetylene compressor, wherein a first thermal sleeve ring mechanism and a second thermal sleeve ring mechanism are arranged outside the shaft sleeve, and a water injection port is arranged between the first thermal sleeve ring mechanism and the second thermal sleeve ring mechanism, wherein the first thermal sleeve ring mechanism and the second thermal sleeve ring mechanism are both provided with annular arc grooves on the inner ring walls, and the inner ring wall of the third thermal sleeve ring mechanism is provided with a spiral groove, when the shaft sleeve rotates with the shaft center, the first thermal sleeve ring mechanism, the second thermal sleeve ring mechanism and the third thermal sleeve ring mechanism will not rotate around the shaft center, that is, they will form a relative motion state with the shaft sleeve, at this time, the sealing liquid is injected into the water injection port, and the sealing liquid will pass through the inner hole expansion of each sleeve ring mechanism. Dispersion, specifically, a liquid film is formed under the structure of the respective annular arc grooves of the first thermal sleeve ring mechanism and the second thermal sleeve ring mechanism to prevent the acetylene gas on the medium side from leaking to the atmosphere side. At the same time, the sealing liquid is subjected to a resistance in the direction of the medium side under the action of the spiral groove structure of the third thermal sleeve ring mechanism, which plays a reverse pumping effect and prevents the sealing liquid from leaking to the atmosphere side. When the shaft center is stationary, that is, the shaft sleeve does not rotate, the sealing liquid will form an eddy current when passing through the annular arc groove of the first thermal sleeve ring mechanism, thereby achieving the purpose of preventing the sealing liquid from leaking to the medium side. The second thermal sleeve ring mechanism can prevent the sealing liquid from leaking to the atmosphere side. When the shaft center is stationary, the third thermal sleeve ring mechanism does not work.

[0021] In general, an embodiment of the utility model provides a water injection sealing structure for an acetylene compressor. The water injection sealing structure is configured by providing a first heat sleeve ring mechanism with an annular arc groove and a second heat sleeve ring mechanism that cooperates with a third heat sleeve ring mechanism with a spiral groove. When the sleeve rotates, water is injected into the sealing structure to achieve the purpose of effectively blocking carbon black particles from entering the sealing cavity and prolonging the service life of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a water injection seal structure for an acetylene compressor is provided for an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the structure of a first heat-shrinkable carbon ring or a second heat-shrinkable carbon ring provided in an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of a third shrink fit carbon ring structure provided in an embodiment of the utility model;

[0026] Figure 4This is a schematic diagram of the structure of the fourth shrink-fit carbon ring or the fifth shrink-fit carbon ring provided in an embodiment of the utility model.

[0027] Marks and corresponding parts names in the attached drawings:

[0028] 1-shaft sleeve, 2-first heat sleeve ring mechanism, 4-water injection port, 5-third heat sleeve ring mechanism, 6-first heat sleeve carbon ring, 7-second heat sleeve carbon ring, 8-third heat sleeve carbon ring, 9-fourth heat sleeve carbon ring, 10-fifth heat sleeve carbon ring, 11-first water outlet, 12-isolating carbon ring, 13-tension spring, 14-second water outlet, 15-rear pump effect ring, 16-air inlet, 17-front pump effect ring, 18-locking nut. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] Example

[0034] like Figure 1As shown, the left side of the sealing structure is the medium side, which is in contact with the working medium of the compressor, and the right side of the sealing structure is the atmosphere side, which is in contact with the air. In actual operation, the sealing right side structure is generally a unit bearing. The embodiment of the utility model provides a water injection sealing structure for an acetylene compressor, including a sleeve 1 installed on the shaft center of the compressor, and the outer side of the sleeve 1 is sleeved with a first heat sleeve ring mechanism 2 and a second heat sleeve ring mechanism axially arranged along the shaft center to achieve a sealing effect. The first heat sleeve ring mechanism 2 and the second heat sleeve ring mechanism are both connected to the stationary part of the compressor. The stationary part here refers to a part that does not rotate with the shaft center. The first heat sleeve mechanism and the second heat sleeve mechanism are connected to the stationary part of the compressor. When the sleeve 1 rotates with the shaft center, the first heat sleeve ring mechanism 2 and the second heat sleeve ring mechanism will not rotate with the shaft center, so that a relative motion state will be formed between the first heat sleeve ring mechanism 2 and the sleeve 1, and between the second heat sleeve ring mechanism and the sleeve 1. When sealing liquid is introduced into the sealing mechanism, a liquid film seal will be formed between the first heat sleeve ring mechanism 2 and the sleeve 1, and between the second heat sleeve ring mechanism and the sleeve 1. It should be noted that the connection between the first heat sleeve ring mechanism 2 and the second heat sleeve ring mechanism and the stationary parts of the sealing structure can be a direct connection or an indirect connection. Generally, the first heat sleeve ring mechanism 2 and the second heat sleeve ring mechanism will be connected to the stationary parts of the sealing structure (such as a heat sleeve ring seat, etc.), and then the stationary parts of the sealing structure will be connected to the stationary parts of the compressor. There is no limitation here, as long as the purpose of the first heat sleeve ring mechanism 2 and the second heat sleeve ring mechanism not rotating with the shaft sleeve can be achieved.

[0035] Specifically, there are gaps between the first thermal ring mechanism 2, the second thermal ring mechanism and the sleeve 1, the first thermal ring mechanism 2 is arranged on the medium side, and the second thermal ring mechanism is arranged on the atmosphere side; a water injection port 4 is arranged between the first thermal ring mechanism 2 and the second thermal ring mechanism, and when the sleeve 1 rotates with the axis, sealing liquid can be injected into the sealing structure from the water injection port 4, and the sealing liquid will flow in the sealing structure. When it flows between the first thermal ring mechanism 2 and the sleeve 1, and between the second thermal ring mechanism and the sleeve 1, the sealing liquid will form a liquid film in the gap, thereby achieving sealing. In the embodiment of the utility model, annular arc grooves are provided on the inner ring walls of the first thermal sleeve ring mechanism 2 and the second thermal sleeve ring mechanism. When the sleeve 1 rotates with the axis and the sealing liquid enters from the water injection port 4, the sealing liquid can form a liquid film between the first thermal sleeve ring mechanism 2 and the sleeve 1 and between the second thermal sleeve ring mechanism and the sleeve 1, thereby generating throttling and reducing pressure, and preventing the acetylene gas on the medium side from leaking to the atmosphere side. When the axis of the compressor is stationary, the sealing liquid can form a vortex between the first thermal sleeve ring mechanism 2 and the sleeve 1 and / or between the second thermal sleeve ring mechanism and the sleeve 1, thereby achieving the purpose of preventing the sealing liquid from leaking.

[0036] The outer side of the sleeve 1 is also sleeved with a third thermal sleeve ring mechanism 5, which is connected to the stationary part of the compressor and will not rotate with the axis, and has a gap with the sleeve 1. The third thermal sleeve ring mechanism 5 is arranged on the atmospheric side of the second thermal sleeve ring mechanism, and a spiral groove is provided on the inner ring wall of the third thermal sleeve ring mechanism 5. The extension direction of the spiral groove is opposite to the rotation direction of the sleeve. When the axis of the compressor drives the sleeve 1 to rotate, the sealing liquid may be subjected to a resistance in the direction of the medium between the third thermal sleeve ring mechanism 5 and the sleeve 1. Specifically, the sealing liquid entering the sealing structure from the water injection port 4 is blocked by the second thermal sleeve ring mechanism, and then the reverse pumping effect of the third thermal sleeve ring mechanism 5 can prevent the sealing liquid from leaking to the right.

[0037] In order to further improve the sealing performance of the new sealing structure of this example, the first heat-shrink ring mechanism 2 of the utility model embodiment is set as a first heat-shrink carbon ring 6 and a second heat-shrink carbon ring 7. The first heat-shrink carbon ring 6 is set next to the second heat-shrink carbon ring 7. An annular arc groove is opened on the inner ring wall of the first heat-shrink carbon ring 6 and the second heat-shrink carbon ring 7. That is, the first heat-shrink ring mechanism 2 includes a first heat-shrink carbon ring 6 and a second heat-shrink carbon ring 7, both of which are provided with an annular arc groove. The two heat-shrink carbon rings have the same function. When the axis is stationary, the sealing liquid will form an eddy current at the annular arc groove. When the axis rotates, the sealing liquid will form a liquid film at the annular arc groove. The setting of the two heat-shrink carbon rings can form a multi-layer liquid film seal or an eddy current seal, thereby improving the sealing performance of the sealing structure of the embodiment of the utility model. Of course, in other embodiments, it is not limited to setting two heat-shrink carbon rings, but only one heat-shrink carbon ring or three, four, etc. can be set. There is no restriction here, as long as a sufficient sealing effect can be achieved. The specific setting can be based on actual needs. Of course, two or more annular arc grooves can also be set on a heat-shrink carbon ring, and multi-layer liquid film and eddy current sealing can also be achieved, thereby achieving the purpose of improving the sealing effect.

[0038] Exemplarily, the second heat sleeve ring mechanism includes a third heat sleeve carbon ring 8, and two axially arranged annular arc grooves are provided on the inner ring wall of the third heat sleeve carbon ring 8, so that when the axis rotates, the sealing liquid will form liquid films at the two annular arc grooves respectively, and the two liquid films are axially parallel, which can achieve the protection of double liquid film sealing. When the axis is stationary, eddies will be formed at the two annular arc grooves respectively, and the effect of double sealing protection will also be achieved. It should be noted that the number of annular arc grooves is not limited here, and can be set according to actual conditions such as the specific structure of the heat sleeve carbon ring. It can be seen that in the embodiment of the utility model, the multiple settings of the heat sleeve carbon ring and the setting of multiple annular arc grooves on a single heat sleeve carbon ring are all for the purpose of realizing multi-layer protection of the sealing structure. During operation, they can be specifically set according to actual conditions, and are not limited here.

[0039] Similarly, the third heat-shrink ring mechanism 5 can also be set as the fourth heat-shrink carbon ring 9 and the fifth heat-shrink carbon ring 10, the fourth heat-shrink carbon ring 9 is set next to the fifth heat-shrink carbon ring 10, and the inner ring wall of the fourth heat-shrink carbon ring 9 and the fifth heat-shrink carbon ring 10 are both provided with a spiral groove. The provision of two heat-shrink carbon rings each with a spiral groove can achieve a double reverse pumping effect, further avoiding the possibility of sealing liquid leakage. In order to further prevent the leakage of the sealing liquid, a first water outlet 11 can be provided between the fourth heat-shrink carbon ring 9 and the fifth heat-shrink carbon ring 10. The sealing liquid entering the sealing structure from the water injection port 4 is blocked by the second heat-shrink ring mechanism, and then leaks from the first water outlet 11 after passing through the reverse pumping effect of the fourth heat-shrink carbon ring 9. The residual sealing liquid is then blocked by the fifth heat-shrink carbon ring 10.

[0040] As a preferred embodiment of the utility model, an isolation carbon ring 12 can be provided on the atmospheric side of the third heat sleeve ring mechanism 5. The isolation carbon ring 12 is sleeved on the outside of the shaft sleeve 1 and there is a gap between the isolation carbon ring 12 and the shaft sleeve 1. The isolation carbon ring 12 is connected to the stationary part of the compressor, that is, the liquid in the isolation carbon ring 12 will not rotate with the axis, thereby preventing the residual sealing liquid after leakage from the first water outlet 11 from entering the right bearing. Preferably, the isolation carbon ring 12 is composed of three petals, each of which is connected by a tension spring 13 and combined into a circular ring. The inner diameter of the circular ring can be changed with the inner diameter of the tension spring 13, that is, the isolation carbon ring 12 composed of three connected together by the tension spring 13 is a ring-shaped structure, and the inner ring is sleeved on the outside of the sleeve 1. Due to the elastic effect of the tension spring 13, the inner diameter of the inner ring can be changed, which can avoid the sleeve 1 and the isolation carbon ring 12 from becoming larger after the wear of the isolation carbon ring 12, thereby affecting the sealing effect. At the same time, the elastic structure can also reduce the wear of the sleeve 1 and the isolation carbon ring 12, thereby improving the durability of the sealing structure of the utility model. In the embodiment of the utility model, a second water outlet 14 is provided between the isolation carbon ring 12 and the third heat sleeve ring mechanism 5, so that under the reverse pumping effect of the fifth heat sleeve carbon ring 10, the residual sealing liquid can further leak from the second water outlet 14, thereby avoiding the sealing liquid from leaking from the right side.

[0041] Furthermore, a post-pumping ring 15 is provided on the atmospheric side of the isolation carbon ring 12. The post-pumping ring 15 is sleeved on the outer side of the shaft sleeve 1 and there is a gap between the post-pumping ring 15 and the shaft sleeve 1. The post-pumping ring 15 is connected to the stationary part of the compressor, and a spiral groove is provided on the inner ring wall. An air inlet 16 is provided between the isolation carbon ring 12 and the post-pumping ring 15. Specifically, an isolator can be introduced into the sealing structure at the air inlet 16. The gas pressure is usually 20 to 40 KPa higher than the normal pressure. The isolation gas can prevent the oil on the right side of the sealing structure from entering the sealing structure, and can also further prevent the residual sealing liquid from entering the right side of the sealing structure. Of course, a front pump effect ring 17 can also be set on the medium side of the first thermal sleeve ring mechanism 2. The front pump effect ring 17 is sleeved on the outside of the shaft sleeve 1 and is connected to the stationary parts of the compressor, that is, the front pump effect ring 17 and the rear pump effect ring 15 will not rotate with the axis. A spiral groove is provided on the inner ring wall of the front pump effect ring 17, and there is a gap between the front pump effect ring 17 and the shaft sleeve 1. During the rotation of the axis, the front pump effect ring 17 plays a role in isolating the sealing liquid from flowing to the medium side.

[0042] For example, Figure 1 As shown, the left side of the sealing structure is the medium side, which contacts the working medium of the compressor; the right side is the atmosphere side, which contacts the air; the right side of the sealing structure is the unit bearing. When the carbon ring sealing structure is working, desalted water needs to be injected from the water injection port 4. When the shaft is stationary, the sealing liquid passes through the first shrink-fit carbon ring 6 and the second shrink-fit carbon ring 7. Since the inner holes of the first shrink-fit carbon ring 6 and the second shrink-fit carbon ring 7 are provided with annular arc grooves (such as Figure 2 ), when the sealing liquid passes through, a vortex will be formed here, thereby achieving the purpose of preventing the sealing liquid from leaking; when the shaft rotates, the sealing liquid will form a liquid film at the first shrink-fit carbon ring 6 and the second shrink-fit carbon ring 7, resulting in throttling and pressure reduction, preventing the acetylene gas on the medium side from leaking to the atmosphere side. And a spiral groove (such as Figure 4 When the shaft rotates, a reverse pumping effect will be generated at the front pumping ring 17 to prevent the sealing liquid from flowing to the medium side. Only a small amount of sealing liquid will flow to the medium side through the first shrink-fit carbon ring 6, the second shrink-fit carbon ring 7 and the front pumping ring 17. When the shaft is stationary, the front pumping ring 17 does not work.

[0043] The sealing liquid that enters the sealing structure from the water injection port 4 passes through the third heat-shrink carbon ring 8 to block the seal, and then passes through the reverse pumping effect of the fourth heat-shrink carbon ring 9 to leak from the first water outlet 11. The remaining sealing liquid passes through the reverse pumping effect of the fifth heat-shrink carbon ring 10 and leaks from the second water outlet 14. The inner hole of the third heat-shrink carbon ring 8 is provided with an annular groove (such as Figure 3 ), the effect is similar to that of the first heat-shrink carbon ring 6 and the second heat-shrink carbon ring 7; the inner hole of the fourth heat-shrink carbon ring 9 or the fifth heat-shrink carbon ring 10 is a spiral groove (such as Figure 4), has a similar function to the front pump effect ring 17, and can reverse the pump effect to prevent the sealing liquid from leaking to the right. The air inlet 16 needs to be introduced with isolation gas, and an isolation carbon ring 12 is provided on each side of the air inlet 16 to prevent the residual sealing liquid from leaking from the air inlet 16 inside the sealing structure and entering the right bearing, and also to prevent the lubricating oil at the sealed right bearing from entering the inside of the sealing structure. The isolation carbon ring 12 is a three-petal type, which is formed into one body by a tension spring 13. The rear pump effect ring 15 will block a part of the lubricating oil through the reverse pump effect, and then zero overflow can be achieved after being blocked by the isolation carbon ring 12. Since the pressure of the residual sealing liquid and lubricating oil is at normal pressure, the pressure of the sealing gas introduced into the air inlet 16 is usually 20 to 40 KPa higher than normal pressure.

[0044] The sealing structure provided by the embodiment of the utility model is a water-injected carbon ring sealing structure. The double blocking seal can ensure zero leakage of the process medium, and can also ensure that no other gas enters the process medium, and can reduce the wear between the carbon ring and the shaft sleeve 1, thereby increasing the service life of the carbon ring seal and achieving long-term safe operation of the unit. At the same time, from the perspective of use effect and economy, the use of water-injected carbon ring seals for cracking gas compressors is more practical than gas-injected carbon ring seals, which can well prevent carbon black particles from entering the sealing cavity, and the wear of the carbon ring and the rotor is relatively slight, thereby extending the life and maintenance cycle of the carbon ring, and is also conducive to reducing the gas temperature in the compressor chamber.

[0045] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the utility model omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the utility model.

Claims

1. A water injection seal structure for an acetylene compressor, comprising a sleeve (1) mounted on the shaft center of the compressor, It is characterized in that The shaft sleeve (1) is sleeved with a first thermal sleeve mechanism (2) and a second thermal sleeve mechanism arranged along the axis of the shaft, the first thermal sleeve mechanism (2) and the second thermal sleeve mechanism are both connected to the stationary part of the compressor, there is a gap between the first thermal sleeve mechanism (2) and the second thermal sleeve mechanism and the shaft sleeve (1), the first thermal sleeve mechanism (2) is arranged on the medium side, and the second thermal sleeve mechanism is arranged on the atmosphere side; A water injection port (4) is provided between the first thermal sleeve ring mechanism (2) and the second thermal sleeve ring mechanism, and an annular arc groove is provided on the inner ring wall of the first thermal sleeve ring mechanism (2) and the second thermal sleeve ring mechanism. When the sealing liquid enters from the water injection port (4), it will enter the sealing structure along the water injection port (4). When the axis of the compressor drives the shaft sleeve (1) to rotate, the sealing liquid can form a liquid film between the first thermal sleeve ring mechanism (2) and the shaft sleeve (1), and the sealing liquid can form a liquid film between the second thermal sleeve ring mechanism and the shaft sleeve (1). When the axis of the compressor is stationary, the sealing liquid can form a vortex between the first thermal sleeve ring mechanism (2) and the shaft sleeve (1) and / or between the second thermal sleeve ring mechanism and the shaft sleeve (1); A third thermal sleeve ring mechanism (5) is also sleeved on the outer side of the shaft sleeve (1). The third thermal sleeve ring mechanism (5) is connected to the stationary part of the compressor and has a gap with the shaft sleeve (1). The third thermal sleeve ring mechanism (5) is arranged on the atmosphere side of the second thermal sleeve ring mechanism. A spiral groove is provided on the inner ring wall of the third thermal sleeve ring mechanism (5). When the shaft center of the compressor drives the shaft sleeve (1) to rotate, the sealing liquid can be subjected to a resistance in the direction of the medium side between the third thermal sleeve ring mechanism (5) and the shaft sleeve (1).

2. A water injection seal structure for an acetylene compressor according to claim 1, It is characterized in that The first heat-shrink-fit ring mechanism (2) comprises a first heat-shrink-fit carbon ring (6) and a second heat-shrink-fit carbon ring (7); the first heat-shrink-fit carbon ring (6) is arranged beside the second heat-shrink-fit carbon ring (7); and an annular arc groove is provided on the inner ring wall of the first heat-shrink-fit carbon ring (6) and the second heat-shrink-fit carbon ring (7).

3. A water injection sealing structure for an acetylene compressor according to claim 1, It is characterized in that The second heat-shrink ring mechanism comprises a third heat-shrink carbon ring (8), and two axially arranged annular circular arc grooves are provided on the inner ring wall of the third heat-shrink carbon ring (8).

4. A water injection seal structure for an acetylene compressor according to claim 1, It is characterized in that The third heat-shrink ring mechanism (5) comprises a fourth heat-shrink carbon ring (9) and a fifth heat-shrink carbon ring (10); the fourth heat-shrink carbon ring (9) is arranged beside the fifth heat-shrink carbon ring (10); and a spiral groove is provided on the inner ring wall of the fourth heat-shrink carbon ring (9) and the fifth heat-shrink carbon ring (10).

5. A water injection seal structure for an acetylene compressor according to claim 4, It is characterized in that A first water outlet (11) is provided between the fourth shrink-fit carbon ring (9) and the fifth shrink-fit carbon ring (10).

6. A water injection seal structure for an acetylene compressor according to claim 1, It is characterized in that An isolation carbon ring (12) is provided on the atmosphere side of the third thermal sleeve ring mechanism (5); the isolation carbon ring (12) is sleeved on the outside of the shaft sleeve (1) and there is a gap between the isolation carbon ring (12) and the shaft sleeve (1); the isolation carbon ring (12) is connected to the stationary part of the compressor.

7. A water injection seal structure for an acetylene compressor according to claim 6, It is characterized in that The isolation carbon ring (12) is composed of three petals, each adjacent petal is connected by a tension spring (13) and is combined into a circular ring. The inner diameter of the circular ring can be changed according to the inner diameter of the tension spring (13).

8. A water injection seal structure for an acetylene compressor according to claim 6, It is characterized in that A second water outlet (14) is provided between the isolation carbon ring (12) and the third thermal sleeve ring mechanism (5).

9. A water injection seal structure for an acetylene compressor according to claim 6, It is characterized in that A rear pumping effect ring (15) is arranged on the atmosphere side of the isolation carbon ring (12); the rear pumping effect ring (15) is sleeved on the outside of the shaft sleeve (1) and there is a gap between the rear pumping effect ring (15) and the shaft sleeve (1); the rear pumping effect ring (15) is connected to a stationary part of the compressor and a spiral groove is provided on the inner ring wall; an air inlet (16) is provided between the isolation carbon ring (12) and the rear pumping effect ring (15).

10. A water injection seal structure for an acetylene compressor according to claim 1, It is characterized in that A front pump effect ring (17) is provided on the medium side of the first thermal sleeve ring mechanism (2); the front pump effect ring (17) is sleeved on the outside of the shaft sleeve (1) and connected to the stationary part of the compressor; a spiral groove is provided on the inner ring wall of the front pump effect ring (17) and there is a gap between the front pump effect ring (17) and the shaft sleeve (1).

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