Sealing ring for piston

Abstract

The utility model discloses a sealing ring for a piston, which solves the technical problem that the sealing performance between the piston and the inner wall of a cylinder is reduced due to the fact that high-pressure gas affects the contact fit between the sealing ring on the piston and the inner wall of the cylinder in the gas compression process of the piston. The sealing ring structurally comprises a sealing ring body, an annular expansion mechanism arranged in the sealing ring body and coaxial with the sealing ring body, and an air entraining mechanism arranged at the bottom of the sealing ring body and communicated with the expansion mechanism. The sealing ring is scientific and reasonable in design, convenient to use and capable of effectively utilizing pressurized gas in the air cylinder to apply radial force to the sealing ring, so that the sealing ring is tightly attached to the inner wall of the air cylinder, the matching effect of the sealing ring on the piston and the inner wall of the air cylinder is enhanced, and the sealing performance between the sealing ring and the inner wall of the air cylinder is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston seals, and in particular relates to a sealing ring for a piston. Background Art

[0002] Reciprocating piston process compressor is a common industrial equipment. In the design and use of reciprocating piston process compressor, sealing performance is a key factor affecting its working efficiency and service life. In a reciprocating piston process compressor, the gas is compressed by the reciprocating motion of the piston in the cylinder. The piston and the inner wall of the cylinder are sealed by a sealing ring. During the process of the piston in the cylinder compressing the gas, the pressure of the compressed gas gradually increases. The high-pressure gas affects the contact and cooperation between the sealing ring on the piston and the inner wall of the cylinder, which will reduce the sealing between the piston and the inner wall of the cylinder. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sealing ring for a piston, which solves the technical problem that during the process of piston compressing gas, high-pressure gas affects the contact and cooperation between the sealing ring on the piston and the inner wall of the cylinder, resulting in reduced sealing between the piston and the inner wall of the cylinder.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A sealing ring for a piston comprises a sealing ring body, an annular expansion mechanism arranged in the sealing ring body and coaxial with the sealing ring body, and an air induction mechanism opened at the bottom of the sealing ring body and connected with the expansion mechanism.

[0006] Furthermore, the air inlet mechanism includes a plurality of air inlet grooves formed at the bottom of the sealing ring body, positioning holes corresponding to and connected to the air inlet grooves, and a first through hole formed at the bottom of the sealing ring body and connected to the positioning holes and the expansion mechanism.

[0007] Furthermore, the expansion mechanism includes an expansion limit ring body which is arranged in the sealing ring body, is annular and coaxial with the sealing ring body, and an expansion ring body which is sleeved in the expansion limit ring body and fits with the inner wall of the expansion limit ring body; the expansion ring body is connected with the air inlet mechanism.

[0008] Furthermore, the expansion limit ring body includes a plurality of circumferentially evenly distributed and annular support plates, an annular telescopic bag arranged between two adjacent support plates, and an elastic belt arranged between two adjacent support plates and located in the telescopic bag; the support plates, the telescopic bag and the elastic belt are respectively coaxial with the sealing ring body.

[0009] Furthermore, the outer wall of the expansion ring body is in contact with the inner side of the support plate, and a gap is left between the outer wall of the expansion ring body and the telescopic bag.

[0010] Furthermore, a second through hole connected to the air inlet mechanism is provided on the expansion limiting ring body, and a third through hole connected to the second through hole is provided on the expansion ring body.

[0011] Furthermore, an annular convex strip is provided on the outer side of the sealing ring body, an annular transition groove is formed between two adjacent convex strips, and the convex strip and the transition groove are coaxial with the sealing ring body respectively.

[0012] Furthermore, a ring-shaped mounting hole is provided in the sealing ring body, the expansion mechanism is arranged in the mounting hole, and the mounting hole is coaxial with the sealing ring body.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model has a simple structure, a scientific and reasonable design, and is easy to use. The utility model effectively utilizes the pressurized gas in the cylinder to apply radial force to the sealing ring, so that the sealing ring and the inner wall of the cylinder are closely fitted, thereby enhancing the matching effect between the sealing ring on the piston and the inner wall of the cylinder, and improving the sealing performance between the sealing ring and the inner wall of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the structure of the utility model.

[0016] Figure 2 It is a bottom view of the structure of the utility model.

[0017] Figure 3 It is a cross-sectional view of the expansion mechanism.

[0018] Figure 4 This is an enlarged view of area A.

[0019] Figure 5 It is a cross-sectional view of the expansion limit ring.

[0020] Figure 6 It is a cross-sectional view of the expansion ring.

[0021] Figure 7 It is a top view of the expansion ring.

[0022] Figure 8 This is a bottom view of the expansion ring.

[0023] Fig. 9 It is a cross-sectional view of the sealing ring body.

[0024] The names corresponding to the reference numerals are:

[0025] 1-sealing ring body, 2-air guide groove, 3-positioning hole, 4-first through hole, 5-expansion ring body, 6-expansion limit ring body, 7-gap, 8-support plate, 10-telescopic bag, 9-elastic belt, 11-second through hole, 12-third through hole, 13-convex strip, 14-transition groove, 15-installation ring hole, 16-air cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] 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.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0029] Example 1

[0030] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0031] The utility model has a simple structure, a scientific and reasonable design, and is easy to use. The utility model effectively utilizes the pressurized gas in the cylinder to apply radial force to the sealing ring, so that the sealing ring and the inner wall of the cylinder are closely fitted, thereby enhancing the matching effect between the sealing ring on the piston and the inner wall of the cylinder, and improving the sealing performance between the sealing ring and the inner wall of the cylinder.

[0032] The utility model is applied to the piston of a reciprocating piston process compressor. In the cylinder, during the process of the piston compressing the gas, the air inlet mechanism introduces part of the pressurized gas into the expansion mechanism through the first through hole 4. The gas in the expansion mechanism expands after being filled, and applies radial pressure to the sealing ring body 1, so that the sealing ring body 1 is tightly fitted to the inner wall of the cylinder. In this way, the matching effect between the sealing ring as a whole and the inner wall of the cylinder is enhanced, and the sealing performance between the sealing ring and the inner wall of the cylinder is improved.

[0033] Example 2

[0034] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0035] The air inlet mechanism includes a plurality of air inlet grooves 2 provided at the bottom of the sealing ring body 1, positioning holes 3 correspondingly connected to the air inlet grooves 2, and a first through hole 4 provided at the bottom of the sealing ring body 1 and connected to the positioning holes 3 and the expansion mechanism.

[0036] In this embodiment 2, there are at most four air inlet grooves 2, and correspondingly, there are at most four positioning holes 3. The positioning holes 3 are used to find the opening position of the first through hole 4, so as to facilitate the opening of the first through hole 4 at the bottom of the sealing ring body 1 during production. In the process of the piston compressing the gas and gradually increasing the pressure of the gas, the air inlet groove 2 is used to introduce the partially pressurized gas in the cylinder into the expansion mechanism through the first through hole 4, so that the expansion mechanism expands, and then the sealing ring body 1 is closely attached to the inner wall of the cylinder, thereby enhancing the matching effect between the sealing ring as a whole and the inner wall of the cylinder, and improving the sealing performance between the sealing ring and the inner wall of the cylinder.

[0037] Example 3

[0038] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0039] The expansion mechanism includes an annular expansion limit ring body 6 which is arranged in the sealing ring body 1 and is coaxial with the sealing ring body 1, and an expansion ring body 5 which is sleeved in the expansion limit ring body 6 and fits with the inner wall of the expansion limit ring body 6; the expansion ring body 5 is connected to the air bleed mechanism.

[0040] In this embodiment 3, an air cavity 16 is provided in the expansion ring body 5, and the air cavity 16 is connected to the air inlet mechanism. During the process of the piston compressing the gas, the air inlet mechanism introduces part of the pressurized gas in the cylinder into the air cavity. After the air cavity 16 is filled with gas, as the piston compresses the gas, the gradually pressurized gas in the cylinder continues to be filled into the air cavity 16, so that the expansion ring body 5 expands. The expansion limit ring body 6 is used to transmit the pressure generated by the expansion of the expansion ring body 5 to the sealing ring body 1, and also limits the expansion process of the expansion ring body 5 to prevent the expansion ring body 5 from over-expanding.

[0041] During the expansion process of the expansion ring body 5, the expansion ring body 5 applies radial force to the expansion limit ring body 6, so that the expansion limit ring body 6 expands outward synchronously, and the expansion ring body 5 applies radial force to the sealing ring body 1 through the expansion limit ring body 6 that expands outward. After the expansion limit ring body 6 stops expanding, the expansion limit ring body 6 restricts the expansion ring body 5, so that the expansion ring body 5 cannot continue to expand, and then the sealing ring body 1 stops expanding and extending outward. In this way, it can be ensured that the sealing ring body 1 fits the inner wall of the cylinder appropriately.

[0042] Example 4

[0043] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0044] The expansion mechanism includes an annular expansion limit ring body 6 which is arranged in the sealing ring body 1 and is coaxial with the sealing ring body 1, and an expansion ring body 5 which is sleeved in the expansion limit ring body 6 and fits with the inner wall of the expansion limit ring body 6; the expansion ring body 5 is connected to the air bleed mechanism.

[0045] The expansion limit ring body 6 includes a plurality of circumferentially evenly distributed and annular support plates 8, an annular telescopic bag 10 arranged between two adjacent support plates 8, and an elastic band 9 arranged between two adjacent support plates 8 and located in the telescopic bag 10; the support plates 8, the telescopic bag 10 and the elastic band 9 are respectively coaxial with the sealing ring body 1.

[0046] In the present embodiment 4, affected by the expansion of the expansion ring body 5, the expansion limit ring body 6 expands outward, the two adjacent support plates 8 on the expansion limit ring body 6 move away from each other, the elastic band 9 between the two adjacent support plates 8 elastically deforms as the two adjacent support plates 8 move, and the telescopic bag 10 between the two adjacent support plates 8 stretches as the two adjacent support plates 8 move. After the telescopic bag 10 no longer stretches, the expansion limit ring body 6 as a whole expands outward to the maximum amount. At this time, the expansion limit ring body 6 restricts the ring body 5 to be expanded to prevent the ring body 5 to be expanded from over-expansion. When the gas in the ring body 5 to be expanded leaks out and the expansion ring body 5 restores its shape, the expansion limit ring body 6 is no longer subjected to radial pressure. At this time, the elastic band 9 restores its deformation and drives the two adjacent support plates 8 to move closer to each other, so that the expansion limit ring body 6 as a whole returns to its original state, and the expansion limit ring body 6 releases the pressure on the sealing ring body 1, and the sealing ring body 1 gradually returns to its original state.

[0047] The support plate 8 is a metal plate. The telescopic bag 10 between two adjacent support plates 8 is composed of upper and lower layers of metal telescopic belts. An annular sleeve cavity is formed between the two layers of metal telescopic belts and the two adjacent support plates 8. The elastic belt 9 is located in the annular sleeve cavity.

[0048] The sealing ring body 1, the expansion ring body 5 and the elastic band 9 are all made of rubber.

[0049] Example 5

[0050] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0051] The expansion mechanism includes an annular expansion limit ring body 6 which is arranged in the sealing ring body 1 and is coaxial with the sealing ring body 1, and an expansion ring body 5 which is sleeved in the expansion limit ring body 6 and fits with the inner wall of the expansion limit ring body 6; the expansion ring body 5 is connected to the air bleed mechanism.

[0052] The expansion limit ring body 6 includes a plurality of circumferentially evenly distributed and annular support plates 8, an annular telescopic bag 10 arranged between two adjacent support plates 8, and an elastic band 9 arranged between two adjacent support plates 8 and located in the telescopic bag 10; the support plates 8, the telescopic bag 10 and the elastic band 9 are respectively coaxial with the sealing ring body 1.

[0053] The outer wall of the expansion ring body 5 fits with the inner side of the support plate 8 , and a gap 7 is left between the outer wall of the expansion ring body 5 and the telescopic bag 10 .

[0054] In this embodiment 5, the outer wall of the expansion ring body 5 and the inner side of the support plate 8 are fixedly attached to each other, and a gap 7 is left between the outer wall of the expansion ring body 5 and the telescopic bag 10. In this way, after the expansion ring body 5 is expanded, the expansion ring body 5 can apply radial pressure to the expansion limit ring body 6 as a whole through the support plate 8, and the gap 18 is conducive to the normal expansion and contraction of the telescopic bag 10.

[0055] Example 6

[0056] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0057] The expansion mechanism includes an annular expansion limit ring body 6 which is arranged in the sealing ring body 1 and is coaxial with the sealing ring body 1, and an expansion ring body 5 which is sleeved in the expansion limit ring body 6 and fits with the inner wall of the expansion limit ring body 6; the expansion ring body 5 is connected to the air bleed mechanism.

[0058] The expansion limiting ring body 6 is provided with a second through hole 11 communicating with the air inlet mechanism, and the expansion ring body 5 is provided with a third through hole 12 communicating with the second through hole 11 .

[0059] In this embodiment 6, the second through hole 11 is connected to the first through hole 4. The second through hole 11 is opened on the support plate 8. The air inlet groove introduces part of the pressurized gas in the cylinder into the first through hole 4, and the gas passes through the first through hole 4, the second through hole 11 and the third through hole 12 in sequence and then enters the air cavity 16.

[0060] Example 7

[0061] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0062] An annular convex strip 13 is provided on the outer side of the sealing ring body 1 , and an annular transition groove 14 is formed between two adjacent convex strips 13 . The convex strip 13 and the transition groove 14 are coaxial with the sealing ring body 1 , respectively.

[0063] In this embodiment 7, three convex strips 13 are distributed on the outer side of the sealing ring body 1 in the order of upper, middle and lower, and the convex strips 13 are connected to the sealing ring body 1 in one piece. The purpose of providing multiple convex strips 13 on the outer side of the sealing ring body 1 is that the convex strips 13 located at the lower position are in direct contact with the high-pressure gas in the cylinder. Under long-term use, the cooperation between the lower convex strips 13 and the inner wall of the cylinder is most affected by the high-pressure gas. When the cooperation between the lower convex strips 13 and the inner wall of the cylinder is affected by the high pressure and the sealing performance with the inner wall of the cylinder is reduced, the convex strips 13 located at the upper and middle positions can still function normally to ensure the normal use of the sealing ring body 1. When the sealing performance between the lower convex strips 13 and the inner wall of the cylinder is reduced, resulting in gas leakage, the leaked gas can be retained in the transition groove 14. Providing multiple convex strips 13 on the outer side of the sealing ring body 1 can further enhance the sealing performance of the sealing ring body 1.

[0064] Example 8

[0065] like Figure 1-9 As shown, the utility model provides a sealing ring for a piston, comprising a sealing ring body 1, an annular expansion mechanism arranged in the sealing ring body 1 and coaxial with the sealing ring body 1, and an air inlet mechanism opened at the bottom of the sealing ring body 1 and connected to the expansion mechanism.

[0066] An annular mounting ring hole 15 is provided in the sealing ring body 1 , and the expansion mechanism is arranged in the mounting ring hole 15 . The mounting ring hole 15 is coaxial with the sealing ring body 1 .

[0067] In this embodiment 8, the inner wall of the mounting ring hole 15 and the outer side surface of the support plate 8 are fixedly attached to each other, and a gap is left between the inner wall of the mounting ring hole 15 and the telescopic bag 10. In this way, after the expansion ring body 5 is expanded, the expansion ring body 5 can apply radial pressure to the sealing ring body 1 through the support plate 8, and the gap is conducive to the normal expansion and contraction of the telescopic bag 10.

[0068] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, rather than limiting it, 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; and 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; that is to say, any changes or embellishments 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 solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A sealing ring for a piston, characterized in that: It comprises a sealing ring body (1), an expansion mechanism which is arranged in the sealing ring body (1) and is annular and coaxial with the sealing ring body (1), and an air induction mechanism which is opened at the bottom of the sealing ring body (1) and is connected to the expansion mechanism; The air introduction mechanism comprises a plurality of air introduction grooves (2) formed at the bottom of the sealing ring body (1), positioning holes (3) corresponding to and communicating with the air introduction grooves (2), and a first through hole (4) formed at the bottom of the sealing ring body (1) and communicating with the positioning holes (3) and the expansion mechanism; The expansion mechanism comprises an annular expansion limit ring body (6) disposed in the sealing ring body (1) and coaxial with the sealing ring body (1), and an expansion ring body (5) sleeved in the expansion limit ring body (6) and in contact with the inner wall of the expansion limit ring body (6); the expansion ring body (5) is connected to the air inlet mechanism.

2. A piston sealing ring according to claim 1, characterized in that: The expansion limiting ring body (6) comprises a plurality of circumferentially evenly distributed annular support plates (8), an annular telescopic bag (10) disposed between two adjacent support plates (8), and an elastic band (9) disposed between two adjacent support plates (8) and located within the telescopic bag (10); the support plates (8), the telescopic bag (10) and the elastic band (9) are respectively coaxial with the sealing ring body (1).

3. A piston sealing ring according to claim 2, characterized in that: The outer wall of the expansion ring body (5) fits the inner side surface of the support plate (8), and a gap (7) is left between the outer wall of the expansion ring body (5) and the telescopic bag (10).

4. A piston sealing ring according to claim 1, characterized in that: The expansion limiting ring body (6) is provided with a second through hole (11) connected to the air inlet mechanism, and the expansion ring body (5) is provided with a third through hole (12) connected to the second through hole (11).

5. A piston sealing ring according to claim 1, characterized in that: An annular convex strip (13) is provided on the outside of the sealing ring body (1), an annular transition groove (14) is formed between two adjacent convex strips (13), and the convex strip (13) and the transition groove (14) are respectively coaxial with the sealing ring body (1).

6. A piston sealing ring according to claim 1, characterized in that: An annular mounting ring hole (15) is provided in the sealing ring body (1), the expansion mechanism is arranged in the mounting ring hole (15), and the mounting ring hole (15) is coaxial with the sealing ring body (1).

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