Connecting rod sealing structure

Abstract

The connecting rod sealing structure comprises an oil seal seat, a sealing assembly and an oil seal pressing plate, wherein the sealing assembly and the oil seal pressing plate are arranged in the oil seal seat; the oil seal pressing plate is connected with the oil seal seat and is used for axially limiting the sealing assembly; the sealing assembly comprises at least one oil seal used for sealing the connecting rod. The sealing assembly further comprises a guide abrasion-resistant sleeve, the guide abrasion-resistant sleeve is located on the side, facing lubricating oil, of the oil seal, and the inner wall of the guide abrasion-resistant sleeve is used for being in sliding fit with the outer wall of the connecting rod so as to restrain radial swing of the connecting rod. The guide wear-resistant sleeve is in sliding fit with the connecting rod doing reciprocating motion, radial swing of the connecting rod can be effectively limited, the pressure of a sealing area is stabilized, therefore, sealing reliability is remarkably improved, the service life of the oil seal is prolonged, and the oil seal is suitable for crank connecting rod mechanisms of equipment such as reciprocating pumps and compressors.

Description

Technical Field

[0001] This invention relates to the field of mechanical seal technology, and in particular to a connecting rod sealing structure. Background Technology

[0002] In crank-connecting rod mechanisms, the sealing of the connecting rod connected to the crosshead is crucial for ensuring normal operation. Traditional connecting rod sealing structures typically use only two oil seals connected in series, a single sealing method with several shortcomings. Due to the lack of effective radial constraint and guidance, the connecting rod is prone to radial oscillation during operation, especially under high-stroke and high-mass conditions. This oscillation leads to uneven sealing force between the oil seal lip and the connecting rod perimeter, potentially causing seal failure in localized areas and resulting in lubricating oil leakage. Lubricating oil leakage not only causes oil loss but can also lead to oil emulsification and deterioration, severely impacting the normal operating efficiency and service life of the crank-connecting rod mechanism's power end.

[0003] Furthermore, during the reciprocating motion of the crosshead, a certain gas (lubricating oil) pressure is generated between the crosshead and the oil seal chamber. This pressure fluctuates with the change in the crosshead's movement speed, generating pulsating pressure on the oil seal lip, further exacerbating the seal's instability and shortening its service life. Simultaneously, the existing structure lacks sufficient consideration for dust and water protection, allowing external dust and impurities to easily enter the sealing area, accelerating the wear of the oil seal and connecting rod, and further reducing the reliability of the seal. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a connecting rod sealing structure, which solves the technical problem that the existing connecting rod sealing structure cannot effectively restrain the radial swing of the connecting rod, which easily leads to sealing failure, lubricating oil leakage and shortened oil seal life.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A connecting rod sealing structure includes an oil seal seat, a sealing assembly and an oil seal pressure plate disposed within the oil seal seat; the oil seal pressure plate is connected to the oil seal seat and is used to axially limit the sealing assembly; the sealing assembly includes at least one oil seal for sealing the connecting rod; the sealing assembly further includes a guide wear-resistant sleeve located on the side of the oil seal facing the lubricating oil, the inner wall of which is used to slide against the outer wall of the connecting rod to constrain the radial swing of the connecting rod.

[0007] Furthermore, the oil seal includes a one-way oil seal and a dustproof two-way oil seal; the one-way oil seal and the dustproof two-way oil seal are arranged sequentially along the axial direction of the connecting rod from the side facing the lubricating oil to the side away from the lubricating oil.

[0008] Furthermore, the sealing assembly also includes an oil seal spacer ring, which is disposed between the dustproof bidirectional oil seal and the unidirectional oil seal to separate their sealing chambers so that they can be sealed independently.

[0009] Furthermore, the sealing assembly also includes an O-ring disposed between the oil seal seat and the oil seal spacer.

[0010] Furthermore, the oil seal spacer includes an annular body, which is disposed around the outside of the dustproof bidirectional oil seal and the unidirectional oil seal; the middle of the side wall of the annular body extends radially inward to form an inner annular partition, which is disposed between the dustproof bidirectional oil seal and the unidirectional oil seal, and its two end faces abut against the end faces of the dustproof bidirectional oil seal and the unidirectional oil seal respectively; the two end faces of the annular body abut against the corresponding end faces inside the oil seal seat, so as to jointly achieve axial positioning of the two oil seals.

[0011] Furthermore, the outer periphery of the connecting rod is fitted with a connecting rod wear-resistant tube, the inner wall of the guide wear-resistant sleeve slides in fit with the outer wall of the connecting rod wear-resistant tube, and the oil seal is used to seal the connecting rod wear-resistant tube.

[0012] Furthermore, there is a gap between the partition and the wear-resistant tube of the connecting rod.

[0013] Furthermore, a sealing ring is provided between the connecting rod and the wear-resistant tube of the connecting rod.

[0014] Furthermore, the guide wear-resistant sleeve is an annular component, and its inner wall is provided with a number of annular grooves extending circumferentially at intervals along the axial direction.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This invention, by setting a guide wear-resistant sleeve that slides and engages with the connecting rod inside the oil seal, effectively suppresses the radial oscillation of the connecting rod during movement (especially in high-speed, high-stroke reciprocating motion and when using a large-mass plunger), thereby significantly improving the uniformity and stability of the circumferential sealing force of the oil seal lip and avoiding premature wear and leakage caused by local stress concentration. Simultaneously, by effectively constraining the movement of the connecting rod, the guide wear-resistant sleeve significantly alleviates the periodic pressure fluctuations of the lubricating oil in the sealing chamber caused by the high-speed reciprocating motion of the crosshead, thus suppressing the pressure pulsation of the lubricating oil and maintaining the oil pressure at the oil seal lip in an extremely low and stable static pressure state. This avoids fatigue deformation and sealing force fluctuations at the oil seal lip due to pressure alternation, further enhancing the reliability and durability of the seal and significantly extending the service life of the oil seal under harsh operating conditions.

[0017] 2. This invention effectively prevents external dust, moisture, and other impurities from intruding into the sealing area by setting a dustproof bidirectional seal on the outside of the sealing structure, thus protecting the working environment of the internal oil seal. The bidirectional seal and the unidirectional oil seal are isolated in independent chambers by an oil seal spacer ring, ensuring that they do not interfere with each other. Even if one side of the seal fails, it will not directly affect the sealing function of the other side. Simultaneously, the spacer ring can absorb the fretting load generated by the reciprocating friction between the oil seal and the connecting rod, avoiding additional wear caused by fretting transmission, further improving the reliability and service life of the overall sealing structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the sealing structure of the connecting rod of the present invention;

[0019] Figure 2 This is an enlarged schematic diagram of the sealing structure of the connecting rod of the present invention.

[0020] In the figure, there are 1 oil seal seat, 2 sealing components, 2-1 guide wear-resistant sleeve, 2-2 dustproof bidirectional oil seal, 2-3 unidirectional oil seal, 3 oil seal pressure plate, 4 connecting rod, 5 oil seal spacer ring, 5-1 annular body, 5-2 partition, 6 O-ring, and 7 wear-resistant tube. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in further detail below with reference to specific examples.

[0022] Example 1

[0023] like Figure 1 , Figure 2 As shown, this embodiment provides a connecting rod sealing structure, including an oil seal seat 1, a sealing component 2 and an oil seal pressure plate 3 disposed within the oil seal seat 1; the oil seal pressure plate 3 is connected to the oil seal seat 1 and is used to axially limit the sealing component 2; the sealing component 2 includes at least one oil seal for sealing the connecting rod 4; the sealing component 2 also includes a guide wear-resistant sleeve 2-1, the guide wear-resistant sleeve 2-1 is located on the side of the oil seal facing the lubricating oil, and its inner wall is used to slide and engage with the outer wall of the connecting rod 4 to constrain the radial swing of the connecting rod 4.

[0024] This invention, by providing a guide wear-resistant sleeve 2-1 that slides and engages with the connecting rod 4 on the inner side of the oil seal, effectively suppresses the radial sway of the connecting rod 4 during movement, thereby significantly improving the uniformity and stability of the circumferential sealing force of the oil seal lip and preventing premature wear and leakage caused by local stress concentration. Simultaneously, the guide wear-resistant sleeve 2-1, through effective constraint on the movement of the connecting rod 4, significantly alleviates the periodic pressure fluctuations of the lubricating oil in the sealing chamber caused by the high-speed reciprocating motion of the crosshead, thus suppressing the pressure pulsation of the lubricating oil and maintaining the oil pressure at the oil seal lip in an extremely low and stable static pressure state. This avoids fatigue deformation and sealing force fluctuations at the oil seal lip due to pressure alternation, further enhancing the reliability and durability of the seal and significantly extending the service life of the oil seal under harsh working conditions.

[0025] In a specific implementation, the oil seal includes a dustproof bidirectional oil seal 2-2 and a one-way oil seal 2-3; the one-way oil seal 2-3 and the dustproof bidirectional oil seal 2-2 are arranged sequentially along the axis of the connecting rod 4 from the side facing the lubricating oil to the side away from the lubricating oil.

[0026] Thus, the combination of the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3 provides a more comprehensive sealing effect. The bidirectional dust seal 2-2, positioned at the end furthest from the lubricating oil, better fulfills its dustproof function, preventing the entry of external impurities. Conversely, placing the unidirectional oil seal 2-3 closer to the lubricating oil effectively prevents lubricating oil leakage. Both the bidirectional dust seal 2-2 and the unidirectional oil seal 2-3 utilize existing bidirectional and unidirectional oil seal technologies, which will not be elaborated upon further here.

[0027] In a specific implementation, the sealing assembly 2 further includes an oil seal spacer ring 5, which is disposed between the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3 to separate their sealing chambers so that they can be sealed independently.

[0028] In this way, the oil seal spacer 5 can effectively isolate the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3, ensuring that they work independently within their respective sealing areas without interfering with each other. Even if one side of the seal fails, it will not directly affect the sealing function of the other side, thus improving the reliability of the seal. Furthermore, the oil seal spacer 5 can also absorb the fretting load generated by the reciprocating friction between the oil seal and the connecting rod 4, avoiding additional wear caused by fretting transmission, further improving the reliability and service life of the overall sealing structure.

[0029] In a specific implementation, the sealing assembly 2 further includes an O-ring 6, which is disposed between the oil seal seat 1 and the oil seal spacer 5.

[0030] In this way, O-ring 6 can provide additional auxiliary sealing, enhance the overall sealing effect, and prevent leakage around the oil seal.

[0031] In specific implementation, the oil seal spacer 5 includes an annular body 5-1, which is arranged around the outside of the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3. The middle of the side wall of the annular body 5-1 extends radially inward to form an inner annular partition 5-2, which is disposed between the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3. Its two end faces abut against the end faces of the dustproof bidirectional oil seal 2-2 and the unidirectional oil seal 2-3, respectively. The two end faces of the annular body 5-1 abut against the corresponding end faces inside the oil seal seat, so as to jointly achieve axial positioning of the two oil seals.

[0032] In this way, the partition 5-2 precisely separates the two oil seals on both sides, forming two independent sealing chambers; while the two end faces of the annular body 5-1 respectively abut against the two end faces of the internal mounting position of the oil seal seat 1 to achieve axial limiting, which can prevent the oil seal from moving in the reciprocating motion, achieve overall stable positioning, help to disperse fretting loads, and improve the reliability and service life of the sealing system.

[0033] In specific implementation, the guide wear-resistant sleeve 2-1 is an annular component, and its inner wall is provided with a number of annular grooves extending circumferentially at intervals along the axial direction.

[0034] In this way, the inner groove structure allows some lubricating oil to flow into the guide wear-resistant sleeve 2-1, which can play a role in lubrication and reducing friction, preventing excessive wear between the guide wear-resistant sleeve 2-1 and the connecting rod 4, and improving the durability of the guide wear-resistant sleeve 2-1 and the overall stability of the sealing assembly 2.

[0035] In specific implementation, the outer periphery of the connecting rod 4 is fitted with a connecting rod wear-resistant tube 7, the inner wall of the guide wear-resistant sleeve 2-1 slides in fit with the outer wall of the connecting rod wear-resistant tube 7, and the oil seal is used to seal the connecting rod wear-resistant tube 7.

[0036] This protects connector 4 from wear and reduces the cost of replacing connector 4.

[0037] In practice, there is a gap between the partition 5-2 and the wear-resistant tube 7 of the connecting rod.

[0038] This prevents the partition 5-2 from contacting the wear-resistant tube 7, thus reducing wear on the wear-resistant tube.

[0039] In practice, a sealing ring is provided between the connecting rod 4 and the connecting rod wear-resistant tube 7.

[0040] This ensures an effective seal between the connecting rod 4 and the wear-resistant tube 7, preventing lubricating oil from leaking from the gap between them and contaminating the working medium.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A connecting rod sealing structure, comprising an oil seal seat, a sealing assembly and an oil seal pressure plate disposed within the oil seal seat; the oil seal pressure plate is connected to the oil seal seat and is used to axially limit the sealing assembly; the sealing assembly includes at least one oil seal for sealing the connecting rod; characterized in that, The sealing assembly also includes a guide wear-resistant sleeve located on the side of the oil seal facing the lubricating oil. The inner wall of the guide wear-resistant sleeve is used to slide against the outer wall of the connecting rod to restrain the radial swing of the connecting rod.

2. The connecting rod sealing structure according to claim 1, characterized in that, The oil seal includes a one-way oil seal and a dustproof two-way oil seal; the one-way oil seal and the dustproof two-way oil seal are arranged sequentially along the axial direction of the connecting rod from the side facing the lubricating oil to the side away from the lubricating oil.

3. The connecting rod sealing structure according to claim 2, characterized in that, The sealing assembly also includes an oil seal spacer ring, which is disposed between the dustproof bidirectional oil seal and the unidirectional oil seal to separate their sealing chambers so that they can be sealed independently.

4. The connecting rod sealing structure according to claim 3, characterized in that, The sealing assembly also includes an O-ring disposed between the oil seal seat and the oil seal spacer.

5. The connecting rod sealing structure according to claim 3, characterized in that, The oil seal spacer includes an annular body surrounding the outside of the dustproof bidirectional oil seal and the unidirectional oil seal. The middle of the sidewall of the annular body extends radially inward to form an inner annular partition, which is positioned between the dustproof bidirectional oil seal and the unidirectional oil seal. Its two end faces abut against the end faces of the dustproof bidirectional oil seal and the unidirectional oil seal, respectively. The two end faces of the annular body abut against the corresponding end faces within the oil seal seat, thus jointly achieving axial positioning of the two oil seals.

6. The connecting rod sealing structure according to claim 5, characterized in that, The outer periphery of the connecting rod is fitted with a connecting rod wear-resistant tube, the inner wall of the guide wear-resistant sleeve slides in fit with the outer wall of the connecting rod wear-resistant tube, and the oil seal is used to seal the connecting rod wear-resistant tube.

7. The connecting rod sealing structure according to claim 6, characterized in that, There is a gap between the partition and the wear-resistant tube of the connecting rod.

8. The connecting rod sealing structure according to claim 6, characterized in that, A sealing ring is provided between the connecting rod and the wear-resistant tube of the connecting rod.

9. The connecting rod sealing structure according to claim 1, characterized in that, The guide wear-resistant sleeve is an annular component, and its inner wall is provided with a number of annular grooves extending circumferentially at intervals along the axial direction.

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