Oil-free lubrication labyrinth seal packing structure of compressor and preparation method of oil-free lubrication labyrinth seal packing structure

Abstract

The invention discloses an oil-free lubrication labyrinth sealing filler structure of a compressor and a preparation method of the oil-free lubrication labyrinth sealing filler structure, and solves the technical problems that hydrogen in the compressor is polluted by oil and the sealing in the compressor may fail due to the fact that oil lubrication is adopted in an existing compressor filler sealing technology. The structure comprises a rotating shaft in the compressor, a mounting ring on the compressor, and a packing main body embedded on the mounting ring and arranged on the rotating shaft in a penetrating manner. The method comprises the steps of preparing raw materials of the metal supporting ring, the self-lubricating ring body and the elastic sealing ring, preparing the self-lubricating ring body and assembling the metal supporting ring, the self-lubricating ring body and the elastic sealing ring. The oil-free lubrication of the packing seal is realized by combining the labyrinth seal design and the high-performance self-lubricating material, so that not only is an oil lubrication mode adopted by the packing seal of the existing compressor replaced, but also the sealing efficiency and the stability of the compressor are improved, hydrogen in the compressor is prevented from being polluted by oil, and the service life of the compressor is prolonged. And the problem of sealing failure possibly caused by oil lubrication in the compressor is effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of packing seals, and in particular relates to a compressor oil-free lubrication labyrinth seal packing structure and a preparation method thereof. Background Art

[0002] In the process of transporting pure hydrogen through pipelines, the compressor is the key boosting equipment. As an important component of the compressor, the performance of the packing seal directly affects the hydrogen leakage rate and the operating efficiency of the compressor. Traditional compressor packing seal technology mostly uses oil lubrication, but 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, causing seal failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a compressor oil-free lubrication labyrinth seal packing structure and a preparation method thereof, so as to solve the technical problems that the existing compressor packing seal technology mostly adopts oil lubrication, the hydrogen in the compressor is contaminated by oil, and the seal in the compressor may fail.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A compressor oil-free lubrication labyrinth seal packing structure comprises a rotating shaft located in the compressor, a mounting ring fixed on the compressor, a second embedding groove provided on the mounting ring, and a packing body embedded in the second embedding groove and passed through the rotating shaft; the packing body comprises a metal support ring embedded in the mounting ring and in an annular shape, a self-lubricating ring body embedded on the inner ring of the metal support ring, and an elastic sealing ring arranged on the outer ring of the metal support ring and fitted with the self-lubricating ring body.

[0006] Furthermore, the self-lubricating ring body includes a sealing ring arranged on the inner ring of the metal support ring and passed through the rotating shaft, a plurality of first ring teeth arranged on the inner ring of the sealing ring, and two wing rings integrally connected with the sealing ring and located on the outer ring of the sealing ring; a first embedding groove is formed between the two wing rings and the sealing ring, and the metal support ring is embedded in the first embedding groove; a first gap is formed between the tip of the first ring tooth and the outer wall of the rotating shaft, and a first expansion cavity connected to the first gap is formed between two adjacent first ring teeth.

[0007] Furthermore, the wing ring is located in the second embedding groove, and a plurality of second ring teeth are distributed on the end face of the wing ring, and a plurality of third ring teeth staggered with the second ring teeth are distributed on the inner wall of the second embedding groove, and a second gap is formed between the tip of the second ring tooth and the inner wall of the second embedding groove, and 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 connected with the second gap and the third gap is formed between two adjacent second ring teeth and third ring teeth.

[0008] A method for preparing a compressor oil-free lubricating labyrinth seal packing structure comprises the following steps:

[0009] Step 1, prepare a metal support ring, a self-lubricating ring body material and an elastic sealing ring;

[0010] Step 2, placing the self-lubricating ring raw material into an oven for drying;

[0011] Step 3, putting the dried self-lubricating ring raw materials into a mixer and mixing;

[0012] Step 4, placing the mixed self-lubricating ring raw materials into an electric heating stirring tank for melting;

[0013] Step 5, placing the melted self-lubricating ring body raw material into a hot press mold for pressure molding to obtain a semi-finished self-lubricating ring body;

[0014] Step 6, after demoulding the semi-finished self-lubricating ring body, heat preservation is carried out to further solidify it into a finished self-lubricating ring body;

[0015] Step 7: Use adhesive to bond the finished self-lubricating ring body to the inner ring of the metal support ring;

[0016] Step 8: Use adhesive to bond the elastic sealing ring to the outer ring of the metal support ring;

[0017] Step 9: Use an adhesive to bond the fitting surfaces of the elastic sealing ring and the finished self-lubricating ring body to obtain the compressor oil-free lubricating labyrinth sealing packing structure.

[0018] Furthermore, in step 1, the self-lubricating ring body raw material includes the following raw materials in parts by weight: 65-80 parts of polyetheretherketone, 10 parts of polytetrafluoroethylene, and 10-25 parts of calcium carbonate whiskers.

[0019] Furthermore, in step 2, the temperature of drying the self-lubricating ring body raw material is 130-150°C.

[0020] Furthermore, in step 4, the melting temperature is 340-360° C., and the stirring speed is 400-600 r / min.

[0021] Furthermore, in step 5, the pressurization time of the melted self-lubricating ring body raw material is 8-10 minutes, and the pressure is 18-22 MPa.

[0022] Further, in step 6, after the mold is cooled to 90-110°C, the semi-finished self-lubricating ring body is demolded, and after the demolded semi-finished self-lubricating ring body is cooled to room temperature, the cooled semi-finished self-lubricating ring is placed at 230-260°C for 0.8-1.2h to obtain a finished self-lubricating ring body.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention is scientifically and reasonably designed and easy to use. The present invention realizes oil-free lubrication of the packing seal by combining the labyrinth seal design with the high-performance self-lubricating material, which not only replaces the oil lubrication method of the existing compressor packing seal, but also improves the compressor sealing efficiency and stability, avoids oil contamination of hydrogen in the compressor, and effectively prevents the problem of seal failure that may be caused by oil lubrication of the compressor seal.

[0025] The self-lubricating ring body of the present invention is made of high-performance self-lubricating material, which can effectively reduce the friction and wear between the packing and the shaft, so that the packing can operate stably for a long time. At the same time, the self-lubricating ring body is a labyrinth sealing structure, which can effectively reduce the probability of hydrogen leakage in the compressor and improve the sealing efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the structure of the present invention.

[0027] Figure 2 It is a cross-sectional view of the packing body embedded in the mounting ring.

[0028] Figure 3 This is a cross-sectional view of the installation ring.

[0029] Figure 4 This is an enlarged view of area A.

[0030] Figure 5 This is a cross-sectional view of the metal support ring.

[0031] Figure 6 It is a schematic diagram of the self-lubricating ring body being embedded in the metal support ring.

[0032] Figure 7 It is a cross-sectional view of the self-lubricating ring.

[0033] Figure 8 A cross-sectional view of the sealing ring.

[0034] Fig. 9 It is a cross-sectional view of the elastic sealing ring.

[0035] Fig.10 This is a cross-sectional view of the wing ring.

[0036] Fig.11 The figure is a flow chart of the steps of the method of the present invention.

[0037] The names corresponding to the reference numerals are:

[0038] 1-rotating shaft, 2-mounting ring, 3-filling body, 4-metal support ring, 5-self-lubricating ring body, 6-sealing ring, 7-wing ring, 8-first ring tooth, 9-first embedding groove, 10-first gap, 11-first expansion chamber, 12-second ring tooth, 13-third ring tooth, 14-second embedding groove, 15-second gap, 16-third gap, 17-second expansion chamber, 18-elastic sealing ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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 work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] like Figure 1-11 As shown, the present invention provides a compressor oil-free lubrication labyrinth seal packing structure and a preparation method thereof, which solves the technical problems that the existing compressor packing seal technology mostly adopts oil lubrication, the hydrogen in the compressor is contaminated by oil, and the seal in the compressor may fail.

[0043] The present invention is scientifically and reasonably designed and easy to use. The present invention realizes oil-free lubrication of the packing seal by combining the labyrinth seal design with the high-performance self-lubricating material, which not only replaces the oil lubrication method of the existing compressor packing seal, but also improves the compressor sealing efficiency and stability, avoids oil contamination of hydrogen in the compressor, and effectively prevents the problem of seal failure that may be caused by oil lubrication of the compressor seal.

[0044] A labyrinth seal is a seal in which a number of annular teeth are arranged in sequence around a rotating shaft, with a series of intercepting gaps and expansion cavities formed between the teeth. When the sealed medium passes through the gaps in the tortuous labyrinth, a throttling effect is produced to achieve the purpose of preventing leakage.

[0045] The self-lubricating ring body 5 of the present invention 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 self-lubricating ring body 5 is a labyrinth sealing structure, which can effectively reduce the hydrogen leakage in the compressor and improve the sealing efficiency of the compressor.

[0046] During the operation of the compressor, 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 the friction and wear between the packing and the shaft.

[0047] The compressor oil-free lubricated labyrinth seal packing structure includes a rotating shaft 1 located in the compressor, a mounting ring 2 fixed on the compressor, a second embedding groove 14 provided on the mounting ring 2, and also includes a packing body 3 embedded in the second embedding groove 14 and passed through the rotating shaft 1; the packing body 3 includes a metal support ring 4 embedded in the mounting ring 2 and in an annular shape, a self-lubricating ring body 5 embedded on the inner ring of the metal support ring 4, and an elastic sealing ring 18 provided on the outer ring of the metal support ring 4 and fitted with the self-lubricating ring body 5.

[0048] The metal support ring 4 provides the necessary strength and rigidity for the packing structure. The self-lubricating ring body reduces the wear between the packing structure and the rotating shaft by using its low friction coefficient and self-lubricating properties. The elastic sealing ring 18 is used to compensate for the deformation of the rotating shaft and maintain the sealing stability between the packing structure and the rotating shaft.

[0049] The self-lubricating ring body 5 is used to form a labyrinth seal with the rotating shaft 1 to prevent hydrogen leakage in the compressor. The elastic sealing ring 18 is made of fluororubber. When the rotating shaft 1 is deformed, the elastic sealing ring 18 uses its elastic properties to compensate for the deformation of the rotating shaft 1 to ensure the sealing stability between the self-lubricating ring body 5 and the rotating shaft 1. That is, when the rotating shaft 1 expands, the elastic sealing ring 18 is compressed and deformed, which transfers the force applied to the first gap 10 between the self-lubricating ring body 5 and the rotating shaft 1 due to the expansion of the rotating shaft 1, ensuring the uniformity of the first gap 10 between the self-lubricating ring body 5 and the rotating shaft 1, and ensuring the sealing stability between the self-lubricating ring body 5 and the rotating shaft 1. When the rotating shaft 1 shrinks, the elastic sealing ring 18 ensures the uniformity of the first gap 10 between the self-lubricating ring body 5 and the rotating shaft 1 by rebounding, ensuring the sealing stability between the self-lubricating ring body 5 and the rotating shaft 1.

[0050] The self-lubricating ring body 5 includes a sealing ring 6 arranged on the inner ring of the metal support ring 4 and passed through the rotating shaft 1, a plurality of first ring teeth 8 arranged on the inner ring of the sealing ring 6, and two wing rings 7 integrally connected with the sealing ring 6 and located on the outer ring of the sealing ring 6; a first embedding groove 9 is formed between the two wing rings 7 and the sealing ring 6, and the metal support ring 4 is embedded in the first embedding groove 9; a first gap 10 is formed between the tip of the first ring tooth 8 and the outer wall of the rotating shaft 1, and a first expansion cavity 11 connected to the first gap 10 is formed between two adjacent first ring teeth 8.

[0051] 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 chamber 11 formed between two adjacent first ring teeth 8 and connected to the first gap 10, form a labyrinth seal between the self-lubricating ring body 5 and the rotating shaft 1. When the hydrogen in the compressor passes through the first gap 10 and the first expansion chamber 11, a throttling effect is formed to achieve the purpose of preventing leakage.

[0052] The wing ring 7 is located in the second embedding groove 14, and a plurality of second ring teeth 12 are distributed on the end face of the wing ring 7. A plurality of third ring teeth 13 which are staggered with the second ring teeth 12 are distributed on the inner wall of the second embedding groove 14. A second gap 15 is formed between the tip of the second ring tooth 12 and the inner wall of the second embedding 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 which is connected with the second gap 15 and the third gap 16 is formed between two adjacent second ring teeth 12 and third ring teeth 13.

[0053] A second gap 15 is formed between the tip of the second ring tooth 12 and the inner wall of the second embedding groove 14, a third gap 16 is formed between the tip of the third ring tooth 13 and the end face of the wing ring 7, and a second expansion chamber 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 embedding groove 14, thereby effectively preventing hydrogen in the compressor from leaking out through the second embedding groove 14.

[0054] The preparation method of the compressor oil-free lubrication labyrinth seal packing structure comprises the following steps:

[0055] Step 1, prepare a metal support ring, a self-lubricating ring body material and an elastic sealing ring;

[0056] Step 2, placing the self-lubricating ring raw material into an oven for drying;

[0057] Step 3, putting the dried self-lubricating ring raw materials into a mixer and mixing;

[0058] Step 4, placing the mixed self-lubricating ring raw materials into an electric heating stirring tank for melting;

[0059] Step 5, placing the melted self-lubricating ring body raw material into a hot press mold for pressure molding to obtain a semi-finished self-lubricating ring body;

[0060] Step 6, after demoulding the semi-finished self-lubricating ring body, heat preservation is carried out to further solidify it into a finished self-lubricating ring body;

[0061] Step 7: Use adhesive to bond the finished self-lubricating ring body to the inner ring of the metal support ring;

[0062] Step 8: Use adhesive to bond the elastic sealing ring to the outer ring of the metal support ring;

[0063] Step 9: Use an adhesive to bond the fitting surfaces of the elastic sealing ring and the finished self-lubricating ring body to obtain the compressor oil-free lubricating labyrinth sealing packing structure.

[0064] In step 1, the self-lubricating ring body raw material includes the following raw materials in parts by weight: 65-80 parts of polyetheretherketone, 10 parts of polytetrafluoroethylene, and 10-25 parts of calcium carbonate whiskers.

[0065] In step 2, the temperature of the dried self-lubricating ring raw material is 130-150°C.

[0066] In step 4, the melting temperature is 340-360° C., and the stirring speed is 400-600 r / min.

[0067] In step 5, the pressurization time of the melted self-lubricating ring body raw material is 8-10 minutes and the pressure is 18-22 MPa.

[0068] In step 6, after the mold is cooled to 90-110° C., the semi-finished self-lubricating ring body is demolded, and after the demolded semi-finished self-lubricating ring body is cooled to room temperature, the cooled semi-finished self-lubricating ring is placed at 230-260° C. for 0.8-1.2 hours to obtain a finished self-lubricating ring body.

[0069] In step 7, step 8 and step 9, the adhesive used is a single-component high-temperature resistant epoxy resin adhesive.

[0070] One-component high-temperature resistant epoxy resin adhesive has strong bonding strength and durability. It is often used to seal the 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. It can maintain stable bonding and sealing effects in high-temperature environments, can resist chemical corrosion, and is suitable for the sealing environment inside compressors.

[0071] The oven, hot press, mixer and electric heating stirring tank used in the present invention are all existing known electrical equipment and can be directly purchased and used on the market. The structure, circuit, and control principle of the oven, hot press, mixer and electric heating stirring tank are existing known technologies. Therefore, the structure, circuit, and control principle of the oven, hot press, mixer and electric heating stirring tank are not repeated here.

[0072] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or modifications made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A compressor oil-free lubrication labyrinth seal packing structure, comprising a rotating shaft (1) located in the compressor, a mounting ring (2) fixed on the compressor, and a second mounting groove (14) provided on the mounting ring (2), characterized in that: It also includes a packing body (3) embedded in the second embedding groove (14) and inserted into the rotating shaft (1); the packing body (3) includes an annular metal support ring (4) embedded in the mounting ring (2), a self-lubricating ring body (5) embedded on the inner ring of the metal support ring (4), and an elastic sealing ring (18) provided on the outer ring of the metal support ring (4) and fitted with the self-lubricating ring body (5).

2. The compressor oil-free lubrication labyrinth seal packing structure according to claim 1, characterized in that: The self-lubricating ring body (5) comprises a sealing ring (6) arranged on the inner ring of a metal support ring (4) and inserted on a rotating shaft (1), a plurality of first ring teeth (8) arranged on the inner ring of the sealing ring (6), and two wing rings (7) integrally connected with the sealing ring (6) and located on the outer ring of the sealing ring (6); a first embedding groove (9) is formed between the two wing rings (7) and the sealing ring (6), and the metal support ring (4) is embedded in the first embedding groove (9); a first gap (10) is formed between the tip of the first ring tooth (8) and the outer wall of the rotating shaft (1), and a first expansion cavity (11) connected to the first gap (10) is formed between two adjacent first ring teeth (8).

3. The compressor oil-free lubrication labyrinth seal packing structure according to claim 2, characterized in that: The wing ring (7) is located in the second embedding groove (14), a plurality of second ring teeth (12) are distributed on the end surface of the wing ring (7), a plurality of third ring teeth (13) are distributed on the inner wall of the second embedding groove (14) and are offset from the second ring teeth (12), a second gap (15) is formed between the tip of the second ring tooth (12) and the inner wall of the second embedding groove (14), a third gap (16) is formed between the tip of the third ring tooth (13) and the end surface of the wing ring (7), and a second expansion cavity (17) connected to the second gap (15) and the third gap (16) is formed between two adjacent second ring teeth (12) and third ring teeth (13).

4. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to any one of claims 1 to 3, characterized in that: The steps include: Step 1, prepare a metal support ring, a self-lubricating ring body material and an elastic sealing ring; Step 2, placing the self-lubricating ring raw material into an oven for drying; Step 3, putting the dried self-lubricating ring raw materials into a mixer and mixing; Step 4, placing the mixed self-lubricating ring raw materials into an electric heating stirring tank for melting; Step 5, placing the melted self-lubricating ring body raw material into a hot press mold for pressure molding to obtain a semi-finished self-lubricating ring body; Step 6, after demoulding the semi-finished self-lubricating ring body, heat preservation is carried out to further solidify it into a finished self-lubricating ring body; Step 7: Use adhesive to bond the finished self-lubricating ring body to the inner ring of the metal support ring; Step 8: Use adhesive to bond the elastic sealing ring to the outer ring of the metal support ring; Step 9: Use an adhesive to bond the fitting surfaces of the elastic sealing ring and the finished self-lubricating ring body to obtain the compressor oil-free lubricating labyrinth sealing packing structure.

5. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to claim 4, characterized in that: In step 1, the self-lubricating ring body raw material includes the following raw materials in parts by weight: 65-80 parts of polyetheretherketone, 10 parts of polytetrafluoroethylene, and 10-25 parts of calcium carbonate whiskers.

6. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to claim 4, characterized in that: In step 2, the temperature of the dried self-lubricating ring raw material is 130-150°C.

7. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to claim 4, characterized in that: In step 4, the melting temperature is 340-360° C., and the stirring speed is 400-600 r / min.

8. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to claim 4, characterized in that: In step 5, the pressurization time of the melted self-lubricating ring body raw material is 8-10 minutes and the pressure is 18-22 MPa.

9. The method for preparing a compressor oil-free lubrication labyrinth seal packing structure according to claim 4, characterized in that: In step 6, after the mold is cooled to 90-110° C., the semi-finished self-lubricating ring body is demolded, and after the demolded semi-finished self-lubricating ring body is cooled to room temperature, the cooled semi-finished self-lubricating ring is placed at 230-260° C. for 0.8-1.2 hours to obtain a finished self-lubricating ring body.

Images