High-stability sealing process gas compressor and shaft sealing structure thereof

Abstract

The invention discloses a high-stability sealing process gas compressor and a shaft sealing structure thereof. The high-stability sealing process gas compressor comprises a compressor volute, a compressor sealing body, an impeller and a driving shaft. The driving shaft is arranged in the compressor sealing body, and the driving shaft is fixedly connected with the impeller; the compressor volute and the compressor sealing body are assembled in the radial direction of the driving shaft to form a vortex channel, and the impeller is assembled at an inlet of the vortex channel. A rotary sealing structure assembled in the radial direction is arranged between the compressor sealing body and the driving shaft. According to the compressor structure, the compressor volute, the compressor sealing body and the special rotary sealing structure are assembled in the radial direction, vertical horizontal assembly is not needed, and rapid assembly of the compressor structure is achieved; the compressor volute and the compressor sealing body are integrally cast respectively, and the rotary sealing structure is specially matched with the structural improvement of the radially-assembled compressor structure, so that the risk of process gas leakage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas compressors, and in particular to a high-stability sealing process gas compressor and a shaft sealing structure thereof. Background Art

[0002] Traditional process gas compressors present certain challenges in terms of sealing. Because process gases often have special properties, such as flammability, explosiveness, toxicity, or high purity requirements, compressors must possess excellent sealing performance to prevent gas leakage from posing threats to the environment and production safety. However, over long-term operation, the sealing components of traditional compressors are susceptible to wear and aging, resulting in a gradual decline in sealing performance, which in turn affects the compressor's stability and service life.

[0003] Process gases are categorized into several categories: non-toxic, non-flammable, and non-explosive gases such as nitrogen and carbon dioxide; flammable and explosive gases such as methane, acetylene, and ethylene; and corrosive gases such as hydrogen sulfide and sulfur dioxide. Sealing is crucial for compressors handling flammable, explosive, or corrosive gases. Existing compressors are horizontally split, requiring very high machining precision for the casing and seals. If the upper and lower seal halves do not fit tightly enough, the risk of process gas leakage increases, polluting the environment and posing safety risks. Therefore, a highly stable sealed process gas compressor was proposed. Summary of the Invention

[0004] The object of the present invention is to provide a high-stability sealed process gas compressor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-stability sealed process gas compressor, comprising a volute (101), a sealing body (102), an impeller and a drive shaft (106); The driving shaft (106) is disposed in the sealing body (102), and the driving shaft (106) is fixedly connected to the impeller; The volute (101) and the sealing body (102) are assembled along the radial direction of the drive shaft (106) to form a vortex channel, and the impeller is assembled at the inlet of the vortex channel; A radially assembled rotating sealing structure is constructed between the sealing body (102) and the driving shaft (106).

[0006] Preferably, the rotary sealing structure comprises a shaft sleeve (107) and at least one sealing structure arranged in the radial direction and surrounding the shaft sleeve (107); The shaft sleeve (107) is fixedly sleeved on the circumferential side of the drive shaft (106); The sealing structure comprises a positioning ring and a sealing ring (108); The positioning ring is fixedly connected to the sealing body (102); A non-contact sealing structure is formed between the sealing ring (108) and the shaft sleeve (107); The positioning ring and the sealing ring (108) are relatively fixedly connected via at least one sealing member; The sealing ring (108) is divided into at least two sealing sections.

[0007] Preferably, the rotary sealing structure includes a front fixed structure and a rear fixed structure radially distributed on both sides of all the sealing structures; The front fixing structure and the rear fixing structure are respectively fixedly connected to the sealing body (102); The front fixing structure and the rear fixing structure relatively compress at least one of the sealing structures arranged in the radial direction; The sealing ring (108) of the sealing structure is pressed between the respective positioning ring and the positioning ring of the adjacent sealing structure, or The sealing ring (108) of the sealing structure is pressed tightly between the respective positioning ring and the adjacent rear fixing structure.

[0008] Preferably, the rear positioning ring (104) of the sealing structure arranged forward in the radial direction is integrally provided with the front fixing structure.

[0009] Preferably, the shaft sleeve (107) is configured with at least one set of upper sealing teeth along the radial direction of the drive shaft (106); The sealing ring (108) is configured with at least one set of lower sealing teeth (109) along the radial direction of the drive shaft (106); The upper sealing teeth and the lower sealing teeth (109) aligned in the radial direction of the drive shaft (106) are assembled to form a labyrinth seal.

[0010] Preferably, the sealing ring (108) of the sealing structure arranged last in the radial direction is integrally formed with an arc-shaped elastic extrusion plate (200) on the side close to the rear positioning ring (104), and a storage cavity filled with hydraulic oil is formed between the arc-shaped elastic extrusion plate (200) and the sealing ring (108). A liquid infusion tube (202) is provided inside the sealing ring (108), and the liquid inlet and outlet of the liquid infusion tube (202) are connected to a liquid inlet valve (201). The rear positioning ring (104) is connected to the rear positioning ring (104). A plurality of elastic sealing capsules (300) are arranged between the arc-shaped elastic extrusion plates (200), the interior of the elastic sealing capsules (300) is filled with a first filling magnetic powder (302), and a lower electromagnet (301) is integrally formed inside the sealing ring (108) located below the rear positioning ring (104), and the side of the plurality of elastic sealing capsules (300) close to the arc-shaped elastic extrusion plates (200) is arc-shaped and fits with the outer wall surface of the arc-shaped elastic extrusion plates (200).

[0011] Preferably, an adsorption extrusion sealing capsule (400) is provided between the rear positioning ring (104) and the arc-shaped elastic extrusion plate (200), the interior of the adsorption extrusion sealing capsule (400) is filled with second filling magnetic powder (401), and the interior of the rear fixing structure is fixedly connected to a side electromagnet (402).

[0012] Preferably, the number of the adsorption extrusion sealing capsules (400) is plural, and the side of the plural adsorption extrusion sealing capsules (400) close to the arc-shaped elastic extrusion plate (200) is an arc-shaped surface and fits the arc-shaped elastic extrusion plate (200).

[0013] Preferably, an intermediate carrier capsule (500) is connected between the elastic sealing capsule (300) and the adsorption and extrusion sealing capsule (400), the interior of the intermediate carrier capsule (500) is filled with expanded graphite (501), the interior of the expanded graphite (501) is equipped with a heating wire (502), the interior of the rear fixing plate (105) is equipped with a power switch (503), and the end of the heating wire (502) away from the intermediate carrier capsule (500) passes through the inner wall of the sealing ring (108) and is electrically connected to the power switch (503).

[0014] Furthermore, the present invention provides a shaft sealing structure including the rotary sealing structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the compressor volute, compressor sealing body and special rotating sealing structure of the compressor structure are assembled radially, which realizes the rapid assembly of the compressor structure compared with the existing horizontally split compressor structure; the compressor volute and compressor sealing body are cast as a whole and do not require processing of the center surface, and the rotating sealing structure is specially matched with the structural improvement of the radially assembled compressor structure, which reduces the risk of process gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of the structure of an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the lower sealing teeth in an embodiment of the present invention; Figure 3 For the embodiment of the present invention Figure 1 Schematic diagram of the enlarged structure of area A; Figure 4 This is a schematic cross-sectional view of a single elastic sealing capsule in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of multiple elastic sealing capsules in an embodiment of the present invention; Figure 6 Schematic diagram of the partial structure of the rear sealing ring and the positioning ring in an embodiment of the present invention.

[0018] In the figure: 101, compressor volute; 102, compressor sealing body; 103, front positioning ring; 104, rear positioning ring; 105, rear fixing plate; 106, drive shaft; 107, bushing; 108, sealing ring; 109, lower sealing tooth; 110, middle positioning ring; 200, arc-shaped elastic extrusion plate; 201, liquid inlet valve; 202, infusion tube; 300, elastic sealing capsule; 301, lower electromagnet; 302, first filling magnetic powder; 400, adsorption and extrusion sealing capsule; 401, second filling magnetic powder; 402, side electromagnet; 500, middle bearing capsule; 501, expanded graphite; 502, heating wire; 503, power switch; 600, sealing ring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1: Figure 1 As shown, the present invention provides a high-stability sealed process gas compressor, comprising a compressor volute 101, a compressor seal 102, an impeller, and a drive shaft 106. Drive shaft 106 is disposed within compressor seal 102 and fixedly connected to the impeller. Compressor volute 101 and compressor seal 102 are assembled radially along drive shaft 106 to form a vortex channel, with the impeller mounted at the inlet of the vortex channel.

[0021] In the present invention, a radially assembled rotary seal structure is constructed between the compressor seal body 102 and the drive shaft 106 . The rotary seal structure can be radially assembled around the drive shaft 106 between the compressor seal body 102 and the drive shaft 106 .

[0022] The rotary sealing structure includes a shaft sleeve 107 and a plurality of sealing structures arranged radially and surrounding the shaft sleeve 107. Each sealing structure is composed of a positioning ring and a sealing ring 108. In terms of structure, the sealing structure can be regarded as a complete sealing structure ring, and the positioning ring and the sealing ring 108 are the outer ring and the inner ring formed by the inner and outer divisions of the sealing structure ring. The section planes of the positioning ring and the sealing ring 108 are inclined or stepped. In order to illustrate the structural relationship between the rotary sealing structure and the compressor sealing body 102 and the drive shaft 106, in the present invention, the positioning ring of the sealing structure arranged radially forward is regarded as the front positioning ring 103, the positioning ring of the sealing structure arranged radially backward is regarded as the rear positioning ring 104, and the positioning rings of other sealing structures are regarded as the middle positioning ring 110.

[0023] A sleeve 107 is fixedly mounted on the circumference of the drive shaft 106 and is configured with several sets of upper sealing teeth along the radial direction of the drive shaft 106. The sealing ring 108 of each sealing structure is configured with several sets of lower sealing teeth 109 along the radial direction of the drive shaft 106. The upper and lower sealing teeth 109, aligned in the radial direction of the drive shaft 106, are assembled to form a labyrinth seal.

[0024] In the present invention, the rotary sealing structure includes a front fixing structure and a rear fixing structure radially distributed on both sides of all sealing structures. The front fixing structure and the rear fixing structure are assembled with the compressor sealing body 102 by at least one bolt.

[0025] Furthermore, the front locating ring 103 is integrally formed with the front fixing structure, i.e., the front locating ring 103 is assembled with the compressor seal 102 via bolts. The rear fixing structure is a rear fixing plate 105, which is assembled with the compressor seal 102 via bolts and blocks the rear locating ring 104 and its corresponding sealing ring 108.

[0026] In the present invention, the plurality of sealing rings 108 are aligned and assembled with the front positioning ring 103 , the middle positioning ring 110 and the rear positioning ring 104 , respectively.

[0027] The plurality of sealing rings 108 can be divided into a front fixing portion, a middle fixing portion and a rear fixing portion. The sealing ring 108 located at the front fixing portion is assembled with the front positioning ring 103 along the radial direction of the driving shaft 106.

[0028] The one or more sealing rings 108 at the middle fixing portion are respectively equipped with respective middle positioning rings 110 along the radial direction of the drive shaft 106 . The sealing ring 108 at the rear fixing portion is equipped with a rear positioning ring 104 along the radial direction of the drive shaft 106 .

[0029] Preferably, the contact section between the sealing ring 108 and the respective positioning ring is a stepped section. An O-shaped sealing ring 600 is provided between the contact sections of the sealing ring 108 and the respective positioning ring.

[0030] Furthermore, the sealing ring 108 is constructed with multiple sections. Specifically, in the present invention, the sealing ring 108 is divided into two upper and lower half-ring sealing sections. The two sealing sections can be sequentially assembled onto the drive shaft 106 to form the sealing ring 108. The sealing ring 108, assembled from the sealing sections, is compressed between the rear fixing plate 105 and the rear positioning ring 104, or between two adjacent positioning rings.

[0031] Based on this, when the present invention is assembled, First, the staff fixed the rear fixing plate 105 to the compressor sealing body 102 with bolts, and then assembled the sealing ring 108 of the rear fixing part to the sleeve 107 and tightly attached to the rear fixing plate 105, and then assembled the rear positioning ring 104 and the O-ring 600 to the sealing ring 108 of the rear fixing part.

[0032] When assembling the sealing ring 108 , the sealing section of one half ring is first assembled to a radial-axial designed position of the drive shaft 106 using the radial clearance, and then the sealing section of the other half ring is assembled to the radial-axial designed position.

[0033] Next, the staff sequentially installs multiple sealing rings 108 and multiple middle positioning rings 110 in the middle fixing portion, so that each sealing ring 108 is radially compressed between its own middle positioning ring 110 and the adjacent middle positioning ring 110. The sealing ring 108 of the rear fixing portion is compressed between the rear positioning ring 104 and the rear fixing plate 105.

[0034] Finally, the staff assembles the sealing ring 108 and the front positioning ring 103 on the front fixing part, and then assembles and fixes the front positioning ring 103 and the compressor sealing body 102 with bolts.

[0035] Then, during the assembly process of the present invention, the sealing ring 108 and the positioning ring are first assembled, and then the sealing ring 108 of each upper and lower split structure is alternately assembled. Finally, the front positioning ring 103 and the rear fixing plate 105 are used to press and limit the assembled middle positioning ring 110, the rear positioning ring 104 and the sealing ring 108, thereby realizing the overall radial assembly of the rotating sealing structure.

[0036] like Figure 1 and Figure 3 As shown, the present invention has an arc-shaped elastic extrusion plate 200 integrally formed on the side of the sealing ring 108 corresponding to the rear positioning ring 104 close to the rear positioning ring 104, and a storage cavity is formed between the arc-shaped elastic extrusion plate 200 and the sealing ring 108. The interior of the storage cavity is filled with hydraulic oil, and the interior of the sealing ring 108 to which the arc-shaped elastic extrusion plate 200 is connected to the outside is connected to an infusion tube 202, and the inlet and outlet ports of the infusion tube 202 are connected to a liquid inlet valve 201.

[0037] Specifically, after assembling the sealing ring 108, the front positioning ring 103, the rear positioning ring 104 and the middle positioning ring 110, the staff connects the hydraulic oil injector to the liquid inlet of the liquid inlet valve 201. After forming a connection with the liquid inlet of the liquid inlet valve 201, the external hydraulic oil can be continuously injected into the storage cavity through the liquid inlet valve 201 and the liquid infusion tube 202. After a large amount of hydraulic oil is injected into the storage cavity, the hydraulic oil will continue to press the arc-shaped elastic extrusion plate 200, so that the arc-shaped elastic extrusion plate 200 is gradually squeezed toward the rear positioning ring 104 located above. In the process of gradually squeezing the arc-shaped elastic extrusion plate 200 toward the position of the rear positioning ring 104, the gas retained between the rear positioning ring 104 and the sealing ring 108 can be squeezed to the outside when the front positioning ring 103 and other components are not threaded in advance, thereby reducing gas retention.

[0038] Specifically, in the traditional use process, the more sealing teeth the labyrinth seal has, the better the effect is, so the volume of the sealing teeth and the sealing ring 108 closer to the shaft end is larger, so the closer to the shaft end of the turbine blade, the better the effect should be.

[0039] The technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: Compared to the prior art, in this embodiment, the compressor volute 101 and the compressor seal body 102 are each integrally structured. Compared to the existing upper and lower split structures, there is no need to machine a horizontal center dividing surface, thereby reducing the risk of process gas leakage. Furthermore, during the assembly process, the front locating ring 103, the rear locating ring 104, the middle locating ring 110, and the sealing ring 108 are sequentially assembled and pressed together, achieving radial installation of the various components. The upper and lower halves of the sealing ring 108 are assembled alternately, ensuring that the sealing ring 108 reaches the theoretical installation position during assembly. Furthermore, during the final pre-assembly process, the present invention can also fill the storage cavity with hydraulic oil, gradually pressing the curved elastic extrusion plate 200 through hydraulic pressure, causing the curved elastic extrusion plate 200 to deform between the rear locating ring 104 and the sealing ring 108. This deformation of the curved elastic extrusion plate 200 squeezes the space between the rear locating ring 104 and the sealing ring 108, thereby reducing gas retention.

[0040] Embodiment 2: Considering that when an arc-shaped elastic extrusion plate 200 is provided to squeeze the gas retained between the rear positioning ring 104 and the sealing ring 108, although it can play the role of active gas discharge during the assembly process, a fine gap will remain between the rear positioning ring 104 and the sealing ring 108 located below the rear positioning ring 104 in subsequent use. In the prior art, even if the arc-shaped elastic extrusion plate 200 is not provided on the top of the multiple sealing rings 108, during long-term use, the contact surfaces between the sealing ring 108, the rear positioning ring 104, the front positioning ring 103 and the multiple middle positioning rings 110 will also wear. Once the wear occurs, fine gaps will be generated. When fine gaps are generated, it is easy for gas to pass through these fine gaps, thereby resulting in insufficient sealing. In response to the above technical problems, the present invention proposes the following technical solutions to solve the above technical problems, specifically: like Figures 3 to 6 As shown, a plurality of elastic sealing sacs 300 are arranged between the rear positioning ring 104 and the arc-shaped elastic extrusion plate 200, the interior of the elastic sealing sacs 300 is filled with a first filling magnetic powder 302, and a lower electromagnet 301 is integrally formed inside the sealing ring 108 located below the rear positioning ring 104, and the side of the plurality of elastic sealing sacs 300 close to the arc-shaped elastic extrusion plate 200 is arc-shaped and fits with the outer wall surface of the arc-shaped elastic extrusion plate 200.

[0041] Specifically, during use, multiple elastic sealing capsules 300 are filled between the rear positioning ring 104 and the arc-shaped elastic extrusion plate 200, and multiple elastic sealing capsules 300 are inserted at the angle position between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104, such as Figure 6As shown by the arrows in the figure, multiple elastic sealing capsules 300 are stacked together and are clamped and squeezed into the edge gap between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104 at the sharp corners below. A secondary seal is formed between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104 by the stacked elastic sealing capsules 300. Therefore, even if a gap is generated between the rear positioning ring 104 and the sealing ring 108 due to continuous shaking and friction, the arc-shaped elastic extrusion plate 200 with hydraulic driving force will push the elastic sealing capsule 300 to further fit into the gap between the rear positioning ring 104 and the sealing ring 108, thereby reducing the occurrence of gaps and leakage.

[0042] like Figure 6 As shown, during the startup of the compressor, the lower electromagnet 301 can also be energized. When the lower electromagnet 301 is energized, the lower electromagnet 301 will generate a magnetic adsorption force. When the magnetic adsorption force is generated, the lower electromagnet 301 will further adsorb the first filling magnetic powder 302 inside the elastic sealing bag 300, so that the multiple elastic sealing bags 300 will further move toward the gap between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104, so that the multiple elastic sealing bags 300 are driven by the first filling magnetic powder 302 to more stably squeeze the gap between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104. Even when the gap expands, the multiple elastic sealing bags 300 will gradually accumulate and squeeze downward under the drive of the lower electromagnet 301, thereby forming a better sealing effect. In the normal state, the first filling magnetic powder 302 inside the lower electromagnet 301 will also adsorb the arc-shaped elastic extrusion plate 200 and the lower electromagnet 301, thereby forming a certain sealing effect in the normal state.

[0043] Furthermore, electrorheological fluid is mixed inside the first filling magnetic powder 302. Because the elastic sealing capsule 300 is too soft during the assembly process of the elastic sealing capsule 300, it is not easy to place the multiple layers of elastic sealing capsules 300 when stacked. Therefore, the first filling magnetic powder 302 is energized from the outside, so that the electrorheological fluid drives the first filling magnetic powder 302 and the elastic sealing capsule 300 to harden, making it convenient for multiple elastic sealing capsules 300 to be stacked together and placed.

[0044] The technical solution in the above-mentioned embodiment of the present invention has at least the following technical effects or advantages: relative to embodiment one, in this embodiment, by stacking and placing multiple elastic sealing capsules 300 in cooperation with the electromagnet 301 below, the multiple elastic sealing capsules 300 can be gradually squeezed toward the angle between the arc-shaped elastic extrusion plate 200 and the bottom of the rear positioning ring 104, and the elastic sealing capsules 300 are squeezed and moved toward the angle between the arc-shaped elastic extrusion plate 200 and the bottom of the rear positioning ring 104, so that the multiple elastic sealing capsules 300 can provide better extrusion sealing effect during the squeezing and movement at the angle, and when a gap is generated between the rear positioning ring 104 and the sealing ring 108 due to continuous friction, the gap can be filled by multiple stacked elastic sealing capsules 300, thereby reducing the phenomenon of insufficient sealing.

[0045] Embodiment 3: The elastic sealing capsule 300 can be used to squeeze and fill the lower angle between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104. The squeezing and filling can reduce the phenomenon of insufficient sealing at the lower angle. However, when the elastic sealing capsule 300 is used alone, it can only ensure the sealing of the lower angle. When the elastic sealing capsule 300 is used and the lower electromagnet 301 is used at the upper angle, it cannot solve the phenomenon of insufficient sealing at the upper angle. In view of the above technical problems, the present invention proposes the following technical solutions to solve the above technical problems, specifically: like Figure 3 and Figure 6 As shown, an adsorption and extrusion sealing capsule 400 is provided between the rear positioning ring 104 and the arc-shaped elastic extrusion plate 200 . The interior of the adsorption and extrusion sealing capsule 400 is filled with second filling magnetic powder 401 , and the interior of the rear fixing plate 105 is fixedly connected to a side electromagnet 402 .

[0046] There are multiple adsorption, extrusion and sealing capsules 400 . One side of the multiple adsorption, extrusion and sealing capsules 400 close to the arc-shaped elastic extrusion plate 200 is in an arc-shaped surface and fits the arc-shaped elastic extrusion plate 200 .

[0047] Specifically, when the elastic sealing sac 300 is used alone, the vertically placed elastic sealing sac 300 cannot enter the upper angle between the arc-shaped elastic extrusion plate 200 and the rear positioning ring 104. Therefore, multiple adsorption and extrusion sealing sacs 400 and side electromagnets 402 are set between the rear positioning ring 104 and the arc-shaped elastic extrusion plate 200, so that when the compressor is started, the multiple side electromagnets 402 are energized. When the multiple side electromagnets 402 are energized, the second filling magnetic powder 401 can be adsorbed, so that the second filling magnetic powder 401 drives the adsorption and extrusion sealing sac 400 to be squeezed into the gap at the upper angle, thereby reducing the insufficient sealing caused by the gap at the upper angle.

[0048] The technical solution in the above-mentioned embodiment of the present invention has at least the following technical effects or advantages: relative to Example 2, in this embodiment, by arranging multiple adsorption and extrusion sealing capsules 400 on one side of the elastic sealing capsule 300, and at the same time using the second filling magnetic powder 401 in conjunction with multiple side electromagnets 402, it can be made possible that during the compressor startup process, the multiple adsorption and extrusion sealing capsules 400 will be driven by the second filling magnetic powder 401 and the adsorption and extrusion sealing capsules 400 to gradually be squeezed toward the upper angle under the adsorption of the side electromagnets 402, thereby reducing the phenomenon of insufficient sealing caused by gaps in the upper angle.

[0049] Embodiment 4: Considering that during use, when a large gap appears and the elastic sealing capsule 300 and the adsorption and extrusion sealing capsule 400 cannot be completely attached to the gap between the rear positioning ring 104 and the sealing ring 108, leakage will occur as a whole. Once leakage occurs, the entire process of the process gas compressor will be affected. In response to the above technical problems, the present invention proposes the following technical solutions to solve the above technical problems, specifically: like Figure 3 and Figure 6 As shown, an intermediate supporting capsule 500 is connected between the elastic sealing capsule 300 and the adsorption and extrusion sealing capsule 400. The interior of the intermediate supporting capsule 500 is filled with expanded graphite 501. The interior of the intermediate supporting capsule 500 is equipped with expanded graphite 501. The end of the expanded graphite 501 away from the intermediate supporting capsule 500 passes through the inner wall of the sealing ring 108. The interior of the rear fixing plate 105 is equipped with a power switch 503, and the power switch 503 is electrically connected to the heating wire 502.

[0050] Specifically, when the gas compressor is not sealed enough and the overall air pressure is reduced, when no problem is found in the external inspection, the staff can turn on the power switch 503 to energize the heating wire 502. When the heating wire 502 is energized, it will generate heat, and the heat will be transferred to the expanded graphite 501 inside the intermediate carrier capsule 500, which will cause the expanded graphite 501 to expand due to the heat. When the heat expands, it will drive the intermediate carrier capsule 500 to expand. When the intermediate carrier capsule 500 expands, it will press the elastic sealing capsule 300 and the suction cup 500. By squeezing the attached extrusion sealing bladder 400, the elastic sealing bladder 300 and the adsorption extrusion sealing bladder 400, a three-level seal can be formed. After the three-level seal is formed, once the compressor has unstable air pressure, it can be determined that there is a problem with the seal at the rear positioning ring 104, the sealing ring 108, the middle positioning ring 110 and the front positioning ring 103. The intermediate supporting bladder 500 and the expanded graphite 501 can not only form a short-term emergency three-level seal, but also serve as an emergency seal detection method. While providing emergency sealing, the sealing problem point can also be confirmed.

[0051] The technical solutions in the above-mentioned embodiments of the present invention have at least the following technical effects or advantages: relative to the third embodiment, in this embodiment, when the overall air pressure of the gas compressor becomes unstable, the staff can turn on the power switch 503, thereby starting the heating wire 502 to generate heat through the power switch 503. When the heating wire 502 generates heat, the expanded graphite 501 will expand due to the heat. When the heat expands, the expanded graphite 501 will drive the intermediate supporting capsule 500 to fill the gap between the overall rear positioning ring 104 and the sealing ring 108. When the expanded graphite 501 fills the gap between the rear positioning ring 104 and the sealing ring 108, it can also drive the elastic sealing capsule 300 and the adsorption and extrusion sealing capsule 400 to be further squeezed into the gap, reducing leakage. The overall structure can not only form an emergency sealing effect, but also determine the location of the leakage problem point through the self-starting emergency seal.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-stability sealed process gas compressor, comprising a volute (101), a sealing body (102), an impeller and a drive shaft (106); The driving shaft (106) is disposed in the sealing body (102), and the driving shaft (106) is fixedly connected to the impeller; It is characterized by: The volute (101) and the sealing body (102) are assembled along the radial direction of the drive shaft (106) to form a vortex channel, and the impeller is assembled at the inlet of the vortex channel; A radially assembled rotating sealing structure is constructed between the sealing body (102) and the driving shaft (106).

2. A high-stability sealed process gas compressor according to claim 1, characterized in that: The rotary sealing structure comprises a shaft sleeve (107) and at least one sealing structure arranged in a radial direction and surrounding the shaft sleeve (107); The shaft sleeve (107) is fixedly sleeved on the circumferential side of the drive shaft (106); The sealing structure comprises a positioning ring and a sealing ring (108); The positioning ring is fixedly connected to the sealing body (102); A non-contact sealing structure is formed between the sealing ring (108) and the shaft sleeve (107); The positioning ring and the sealing ring (108) are relatively fixedly connected via at least one sealing member; The sealing ring (108) is divided into at least two sealing sections.

3. A high-stability sealed process gas compressor according to claim 2, characterized in that: The rotary sealing structure includes a front fixing structure and a rear fixing structure distributed radially on both sides of all the sealing structures; The front fixing structure and the rear fixing structure are respectively fixedly connected to the sealing body (102); The front fixing structure and the rear fixing structure relatively compress at least one of the sealing structures arranged in the radial direction; The sealing ring (108) of the sealing structure is pressed between the respective positioning ring and the positioning ring of the adjacent sealing structure, or The sealing ring (108) of the sealing structure is pressed tightly between the respective positioning ring and the adjacent rear fixing structure.

4. The high-stability sealed process gas compressor according to claim 3, characterized in that: The rear positioning ring (104) of the sealing structure arranged forward in the radial direction is integrally provided with the front fixing structure.

5. The high-stability sealed process gas compressor according to claim 2, characterized in that: The shaft sleeve (107) is configured with at least one set of upper sealing teeth along the radial direction of the drive shaft (106); The sealing ring (108) is configured with at least one set of lower sealing teeth (109) along the radial direction of the drive shaft (106); The upper sealing teeth and the lower sealing teeth (109) aligned in the radial direction of the drive shaft (106) are assembled to form a labyrinth seal.

6. The high-stability sealed process gas compressor according to claim 3, characterized in that: The sealing ring (108) of the sealing structure arranged last in the radial direction is integrally formed with an arc-shaped elastic extrusion plate (200) on the side close to the rear positioning ring (104), and a storage cavity filled with hydraulic oil is formed between the arc-shaped elastic extrusion plate (200) and the sealing ring (108). A liquid infusion tube (202) is provided inside the sealing ring (108), and the liquid inlet and outlet of the liquid infusion tube (202) are connected to a liquid inlet valve (201). The rear positioning ring (104) and the arc-shaped elastic extrusion plate (200) are connected to each other. A plurality of elastic sealing capsules (300) are arranged between the arc-shaped elastic extrusion plates (200), the interior of the elastic sealing capsules (300) is filled with a first filling magnetic powder (302), and a lower electromagnet (301) is integrally formed inside the sealing ring (108) located below the rear positioning ring (104), and the side of the plurality of elastic sealing capsules (300) close to the arc-shaped elastic extrusion plates (200) is arc-shaped and fits with the outer wall surface of the arc-shaped elastic extrusion plates (200).

7. The high-stability sealed process gas compressor according to claim 6, characterized in that: An adsorption extrusion sealing capsule (400) is provided between the rear positioning ring (104) and the arc-shaped elastic extrusion plate (200), the interior of the adsorption extrusion sealing capsule (400) is filled with second filling magnetic powder (401), and the interior of the rear fixing structure is fixedly connected to a side electromagnet (402).

8. The high-stability sealed process gas compressor according to claim 7, characterized in that: There are a plurality of the adsorption, extrusion and sealing capsules (400), and the sides of the plurality of adsorption, extrusion and sealing capsules (400) close to the arc-shaped elastic extrusion plate (200) are arc-shaped and fit the arc-shaped elastic extrusion plate (200).

9. The high-stability sealed process gas compressor according to claim 8, characterized in that: An intermediate carrier capsule (500) is connected between the elastic sealing capsule (300) and the adsorption and extrusion sealing capsule (400), the interior of the intermediate carrier capsule (500) is filled with expanded graphite (501), the interior of the expanded graphite (501) is equipped with a heating wire (502), the interior of the rear fixing plate (105) is equipped with a power switch (503), and the end of the heating wire (502) away from the intermediate carrier capsule (500) passes through the inner wall of the sealing ring (108) and is electrically connected to the power switch (503).

10. A shaft sealing structure, characterized in that: The rotary sealing structure comprises the rotary sealing structure according to any one of claims 1 to 9.

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