Oil-free lubrication labyrinth seal packing structure of compressor
By combining labyrinth seal design with high-performance self-lubricating materials, the problems of hydrogen contamination and seal failure caused by compressor oil lubrication are solved, achieving high-efficiency sealing without oil lubrication and improving the sealing efficiency and stability of the compressor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-03-17
AI Technical Summary
Existing compressor packing seal technologies mostly use oil lubrication, which leads to hydrogen contamination by oil and potential seal failure under high pressure and low temperature conditions.
It adopts a labyrinth seal design and high-performance self-lubricating materials to form an oil-free lubrication labyrinth seal packing structure, including a metal support ring, a sealing ring, an elastic sealing ring, and a self-lubricating ring body. The labyrinth seal structure and self-lubricating materials reduce friction and wear, achieving oil-free lubrication.
It improves the sealing efficiency and stability of the compressor, avoids hydrogen contamination by oil, prevents seal failure, and reduces the probability of hydrogen leakage.
Smart Images
Figure CN224003174U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of packing seal technology, specifically relating to an oil-free lubricated labyrinth seal packing structure for compressors. Background Technology
[0002] In the pipeline transportation of pure hydrogen, the compressor is a key booster device. As an important component of the compressor, the performance of the packing seal directly affects the hydrogen leakage rate and the compressor's operating efficiency. Traditional compressor packing seal technology mostly uses oil lubrication; however, in a hydrogen environment, oil lubrication is prone to hydrogen contamination, and under high pressure and low temperature conditions, the performance of the lubricating oil is easily affected, leading to seal failure. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an oil-free labyrinth seal packing structure for compressors, which solves the technical problems that existing compressor packing seal technologies mostly use oil lubrication, resulting in oil contamination of hydrogen inside the compressor and potential failure of the internal seal.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] An oil-free lubricated labyrinth seal packing structure for a compressor includes a rotating shaft located inside the compressor, an mounting ring fixed to the compressor, a second insert groove formed on the mounting ring, and a packing body embedded in the second insert groove and passing through the rotating shaft. The packing body includes an annular metal support ring embedded in the mounting ring, a first sealing mechanism disposed on the inner ring of the metal support ring and passing through the rotating shaft for sealing the rotating shaft, a second sealing mechanism disposed on the end face of the metal support ring and located in the second insert groove for sealing the second insert groove, and an elastic sealing ring disposed on the outer ring of the metal support ring and fitting against the second sealing mechanism.
[0006] Furthermore, the first sealing mechanism includes a sealing ring disposed on the inner ring of the metal support ring and passing through the rotating shaft, and a plurality of first ring teeth disposed on the inner ring of the sealing ring.
[0007] Furthermore, a first gap is formed between the tip of the first ring tooth and the outer wall of the shaft.
[0008] Furthermore, a first expansion cavity communicating with the first gap is formed between two adjacent first ring teeth.
[0009] Furthermore, the second sealing mechanism includes two wing rings respectively disposed on the two end faces of the metal support ring and located on the outer ring of the sealing ring, and a plurality of second ring teeth distributed on the wing rings.
[0010] Furthermore, several third ring teeth that are misaligned with the second ring teeth are distributed on the inner wall of the second insert groove.
[0011] Furthermore, a second gap is formed between the tip of the second ring tooth and the inner wall of the second insert groove, a third gap is formed between the tip of the third ring tooth and the end face of the wing ring, and a second expansion cavity is formed between two adjacent second ring teeth and third ring teeth, which communicates with the second gap and the third gap.
[0012] Furthermore, a first fitting groove is formed between the two wing rings and the sealing ring, and the metal support ring is fitted into the first fitting groove.
[0013] Furthermore, several elastic protruding rings are distributed on the outer ring of the elastic sealing ring.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] This utility model is scientifically and rationally designed and easy to use. By combining labyrinth seal design with high-performance self-lubricating materials, this utility model achieves oil-free lubrication of the packing seal. It not only replaces the existing oil lubrication method for compressor packing seals, but also improves the sealing efficiency and stability of the compressor, avoids oil contamination of hydrogen in the compressor, and effectively prevents the seal failure problem that may be caused by oil lubrication in the compressor's internal seals.
[0016] The first sealing mechanism of this utility model is made of high-performance self-lubricating material, which can effectively reduce the friction and wear between the packing and the shaft, and enable the packing to operate stably for a long time. At the same time, the first sealing mechanism is a labyrinth seal structure, which can effectively reduce the probability of hydrogen leakage in the compressor and improve the sealing efficiency of the compressor. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of the structure of this utility model.
[0018] Figure 2 This is a cross-sectional view of the packing body being embedded in the mounting ring.
[0019] Figure 3 This is a cross-sectional view of the installation ring.
[0020] Figure 4 This is a magnified view of area A.
[0021] Figure 5 This is a cross-sectional view of the metal support ring.
[0022] Figure 6 This is a schematic diagram of a self-lubricating ring embedded in a metal support ring.
[0023] Figure 7 This is a cross-sectional view of a self-lubricating ring.
[0024] Figure 8 This is a cross-sectional view of the sealing ring.
[0025] Figure 9 This is a cross-sectional view of the elastic sealing ring.
[0026] Figure 10 This is a sectional view of the wing ring.
[0027] Figure 11 A flowchart illustrating the steps involved in preparing the structure of this utility model.
[0028] The names corresponding to the reference numerals in the attached figures are as follows:
[0029] 1-Shaft, 2-Mounting ring, 3-Packing body, 4-Metal support ring, 5-Self-lubricating ring body, 6-Sealing ring, 7-Wing ring, 8-First ring tooth, 9-First insert groove, 10-First gap, 11-First expansion cavity, 12-Second ring tooth, 13-Third ring tooth, 14-Second insert groove, 15-Second gap, 16-Third gap, 17-Second expansion cavity, 18-Elastic sealing ring, 19-Elastic convex ring. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] like Figure 1-11 As shown, the present invention provides a compressor oil-free labyrinth seal packing structure, which solves the technical problems of existing compressor packing seal technologies that mostly use oil lubrication, resulting in oil contamination of hydrogen inside the compressor and potential seal failure.
[0034] This utility model is scientifically and rationally designed and easy to use. By combining labyrinth seal design with high-performance self-lubricating materials, this utility model achieves oil-free lubrication of the packing seal. It not only replaces the existing oil lubrication method for compressor packing seals, but also improves the sealing efficiency and stability of the compressor, avoids oil contamination of hydrogen in the compressor, and effectively prevents the seal failure problem that may be caused by oil lubrication in the compressor's internal seals.
[0035] A labyrinth seal refers to a series of sequentially arranged annular teeth around a rotating shaft. The teeth form a series of flow-blocking gaps and expansion cavities. When the sealed medium passes through the gaps of the tortuous labyrinth, a throttling effect is generated, thereby achieving the purpose of preventing leakage.
[0036] The first sealing mechanism of this utility model is made of high-performance self-lubricating material, which can effectively reduce the friction and wear between the packing and the rotating shaft, so that the packing can operate stably for a long time. At the same time, the first sealing mechanism is a labyrinth sealing structure, which can effectively reduce hydrogen leakage in the compressor and improve the compressor sealing efficiency.
[0037] During compressor operation, the heat generated by the friction between the packing and the shaft causes a lubricating film to form on the surface of the self-lubricating material, reducing friction and wear between the packing and the shaft.
[0038] This utility model includes a rotating shaft 1 located inside a compressor, an mounting ring 2 fixed to the compressor, and a second fitting groove 14 formed on the mounting ring 2. Its distinguishing feature is that it further includes a packing body 3 fitted into the second fitting groove 14 and passing through the rotating shaft 1. The packing body 3 includes a ring-shaped metal support ring 4 fitted into the mounting ring 2, a first sealing mechanism disposed on the inner ring of the metal support ring 4 and passing through the rotating shaft 1 for sealing the rotating shaft 1, a second sealing mechanism disposed on the end face of the metal support ring 4 and located within the second fitting groove 14 for sealing the second fitting groove 14, and an elastic sealing ring 18 disposed on the outer ring of the metal support ring 4 and in contact with the second sealing mechanism.
[0039] The second sealing mechanism of this utility model is integrally connected with the first sealing mechanism. The integrally connected second sealing mechanism and the first sealing mechanism together constitute a self-lubricating ring 5, and the self-lubricating ring 5 is made of a self-lubricating material.
[0040] The metal support ring 4 provides the necessary strength and rigidity to the packing structure. The first sealing mechanism uses its low coefficient of friction and self-lubricating properties to reduce wear between the packing structure and the shaft. The elastic sealing ring 18 is used to compensate for the deformation of the shaft and maintain the sealing stability between the packing structure and the shaft.
[0041] The first sealing mechanism forms a labyrinth seal with the rotating shaft 1 to prevent hydrogen leakage from the compressor. The elastic sealing ring 18 is made of fluororubber. When the rotating shaft 1 deforms, the elastic sealing ring 18 uses its elastic properties to compensate for the deformation, ensuring the sealing stability between the first sealing mechanism and the rotating shaft 1. Specifically, when the rotating shaft 1 expands, the elastic sealing ring 18 is compressed and deformed, transferring the force exerted by the expansion of the rotating shaft 1 on the first gap 10 between the first sealing mechanism and the rotating shaft 1, ensuring the uniformity of the first gap 10 and guaranteeing the sealing stability between them. When the rotating shaft 1 contracts, the elastic sealing ring 18 rebounds to ensure the uniformity of the first gap 10 between the first sealing mechanism and the rotating shaft 1, thus ensuring the sealing stability between them.
[0042] The first sealing mechanism of this utility model includes a sealing ring 6 disposed on the inner ring of a metal support ring 4 and passing through a rotating shaft 1, and a plurality of first ring teeth 8 disposed on the inner ring of the sealing ring 6. A first gap 10 is formed between the tip of the first ring tooth 8 and the outer wall of the rotating shaft 1. A first expansion cavity 11 communicating with the first gap 10 is formed between two adjacent first ring teeth 8.
[0043] The first gap 10 formed between the tip of the first ring tooth 8 and the outer wall of the rotating shaft 1, and the first expansion cavity 11 formed between two adjacent first ring teeth 8 and connected to the first gap 10, make the first sealing mechanism and the rotating shaft 1 form a labyrinth seal. When the hydrogen gas in the compressor passes through the first gap 10 and the first expansion cavity 11, a throttling effect is formed to achieve the purpose of preventing leakage.
[0044] The second sealing mechanism of this utility model includes two wing rings 7 respectively disposed on the two end faces of the metal support ring 4 and located on the outer ring of the sealing ring 6, and a plurality of second ring teeth 12 distributed on the wing rings 7. A plurality of third ring teeth 13, offset from the second ring teeth 12, are distributed on the inner wall of the second fitting groove 14. A second gap 15 is formed between the tip of the second ring tooth 12 and the inner wall of the second fitting groove 14, and a third gap 16 is formed between the tip of the third ring tooth 13 and the end face of the wing ring 7. A second expansion cavity 17, communicating with the second gap 15 and the third gap 16, is formed between two adjacent second ring teeth 12 and third ring teeth 13. A first fitting groove 9 is formed between the two wing rings 7 and the sealing ring 6, and the metal support ring 4 is fitted into the first fitting groove 9. A plurality of elastic protruding rings 19 are distributed on the outer ring of the elastic sealing ring 18.
[0045] A second gap 15 is formed between the tip of the second ring tooth 12 and the inner wall of the second insert groove 14, and a third gap 16 is formed between the tip of the third ring tooth 13 and the end face of the wing ring 7. A second expansion cavity 17 is formed between two adjacent second ring teeth 12 and third ring teeth 13, so that a labyrinth seal is formed between the wing ring 7 and the inner wall of the second insert groove 14, effectively preventing hydrogen gas in the compressor from leaking out through the second insert groove 14.
[0046] This utility model is made by the following steps:
[0047] Step 1: Prepare the raw materials for the metal support ring, the self-lubricating ring body, and the elastic sealing ring;
[0048] Step 2: Place the self-lubricating ring material into an oven to dry;
[0049] Step 3: Place the dried self-lubricating ring material into the mixer and mix.
[0050] Step 4: Place the mixed self-lubricating ring material into an electrically heated stirring tank to melt it;
[0051] Step 5: Place the molten self-lubricating ring material into a hot press mold and press it to form a semi-finished self-lubricating ring.
[0052] Step 6: After demolding the semi-finished self-lubricating ring, keep it warm to further solidify it into a finished self-lubricating ring;
[0053] Step 7: Use adhesive to bond the finished self-lubricating ring to the inner ring of the metal support ring;
[0054] Step 8: Use adhesive to bond the elastic sealing ring to the outer ring of the metal support ring;
[0055] Step 9: Use an adhesive to bond the mating surfaces of the elastic sealing ring and the finished self-lubricating ring body to obtain the oil-free lubrication labyrinth seal packing structure of the compressor.
[0056] In step 1, the self-lubricating ring material is made from the following parts by weight: 65-80 parts of polyether ether ketone, 10 parts of polytetrafluoroethylene, and 10-25 parts of calcium carbonate whiskers.
[0057] In step 2, the temperature for drying the self-lubricating ring material is 130-150℃.
[0058] In step 4, the melting temperature is 340-360℃ and the stirring speed is 400-600 r / min.
[0059] In step 5, the pressurization time for the molten self-lubricating ring material is 8-10 minutes, and the pressure is 18-22 MPa.
[0060] In step 6, after cooling the mold to 90-110℃, the semi-finished self-lubricating ring is demolded, and after the demolded semi-finished self-lubricating ring is cooled to room temperature, the cooled semi-finished self-lubricating ring is placed at 230-260℃ for 0.8-1.2h to obtain the finished self-lubricating ring.
[0061] In steps 7, 8, and 9, the adhesive used is a one-component high-temperature resistant epoxy resin.
[0062] One-component high-temperature resistant epoxy resin adhesive has strong bonding strength and durability, and is often used to seal joints of various components. It can firmly bond different materials such as metals, ceramics, plastics and wood. At the same time, it has excellent high temperature resistance and corrosion resistance, and can maintain stable bonding and sealing effect in high temperature environments. It can resist chemical corrosion and is suitable for the sealing environment inside compressors.
[0063] The oven, hot press, mixer, and electrically heated mixing tank used in this invention are all existing known electrical equipment and can be purchased and used directly on the market. The structure, circuit, and control principle of the oven, hot press, mixer, and electrically heated mixing tank are existing known technologies. Therefore, the structure, circuit, and control principle of the oven, hot press, mixer, and electrically heated mixing tank will not be described in detail here.
[0064] Finally, it should be noted that the above embodiments are merely preferred embodiments of this utility model used to illustrate the technical solutions of this utility model, and are not intended to limit it, nor are they intended to limit the patent scope of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. That is to say, any changes or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but whose technical problems are still consistent with those of this utility model, should be included within the protection scope of this utility model. In addition, the direct or indirect application of the technical solutions of this utility model to other related technical fields are similarly included within the patent protection scope of this utility model.
Claims
1. A labyrinth seal packing structure for oil-free lubrication of a compressor, comprising a rotating shaft (1) located in the compressor, a mounting ring (2) fixed to the compressor, a second embedding groove (14) opened on the mounting ring (2), characterized in that, The filler body (3) is embedded in the second embedding groove (14) and passes through the rotating shaft (1); the filler body (3) comprises a metal supporting ring (4) embedded in the mounting ring (2) and annular, a first sealing mechanism arranged on the inner ring of the metal supporting ring (4) and passing through the rotating shaft (1) for sealing the rotating shaft (1), a second sealing mechanism arranged on the end face of the metal supporting ring (4) and located in the second embedding groove (14) for sealing the second embedding groove (14), and an elastic sealing ring (18) arranged on the outer ring of the metal supporting ring (4) and abutting against the second sealing mechanism.
2. A labyrinth seal packing structure for oil-free lubrication of a compressor as claimed in claim 1, wherein The first sealing mechanism comprises a sealing ring (6) arranged on the inner ring of the metal supporting ring (4) and passing through the rotating shaft (1), and a plurality of first ring teeth (8) arranged on the inner ring of the sealing ring (6).
3. A labyrinth seal packing structure for oil-free lubrication of a compressor as set forth in claim 2, characterized in that, The tip of the first ring tooth (8) and the outer wall of the rotating shaft (1) form a first gap (10).
4. A labyrinth seal packing for oil-free lubricated compressors according to claim 3, characterized in that, The first ring tooth (8) and the outer wall of the rotating shaft (1) form a first gap (10).
5. A labyrinth seal packing for oil-free lubricated compressors according to claim 2, wherein, The second sealing mechanism comprises two wing rings (7) arranged on the two end faces of the metal supporting ring (4) respectively and located on the outer ring of the sealing ring (6) respectively, and a plurality of second ring teeth (12) distributed on the wing ring (7).
6. A labyrinth seal packing structure for oil-free lubrication of a compressor as set forth in claim 5, characterized in that, The second embedding groove (14) is distributed with a plurality of third ring teeth (13) which are staggered with the second ring teeth (12).
7. A labyrinth seal packing structure for oil-free lubrication of a compressor as set forth in claim 6, characterized in that, The tip of the second ring tooth (12) and the inner wall of the second embedding groove (14) form a second gap (15), the tip of the third ring tooth (13) and the end face of the wing ring (7) form a third gap (16), and the second ring tooth (12) and the third ring tooth (13) form a second expansion cavity (17) which is connected with the second gap (15) and the third gap (16).
8. A labyrinth seal packing structure for oil-free lubrication of a compressor as set forth in claim 5, characterized in that, The two wing rings (7) and the sealing ring (6) form a first embedding groove (9), and the metal supporting ring (4) is embedded in the first embedding groove (9).
9. A labyrinth seal packing structure for oil-free lubrication of a compressor as claimed in claim 1, wherein The outer ring of the elastic sealing ring (18) is distributed with a plurality of elastic convex rings (19).