End cover seal structure for pump and gear pump

Abstract

The utility model discloses a kind of end cover sealing structure and gear pump for pump, end cover sealing structure for pump includes end cover, with center hole;Rotary shaft, passes through center hole;Sealing ring, including mutually mirror image symmetrical arrangement's first sealing ring and second sealing ring, the inner ring of sealing ring and the outer wall of rotary shaft contact, the outer ring of sealing ring and the inner wall of center hole contact;Wherein, one side shaft end of sealing ring has annular groove, the opening of first sealing ring, second sealing ring respective annular groove is opposite direction, sealing ring has convex peak part and tongue part, convex peak part and tongue part form several conical surfaces in the inner wall of sealing ring, the generatrix of adjacent conical surface each other presents angle of inclusion, conical surface includes the first conical surface formed by convex peak part, second conical surface, still include the third conical surface formed by tongue part.The utility model uses mirror image symmetrical double sealing ring, cooperation inner wall multi-conical surface realizes multi-line contact, significantly improves sealing.

Description

Technical Field

[0001] This utility model relates to the field of pumps, specifically to a pump end cover sealing structure and a gear pump. Background Technology

[0002] During the operation of pump equipment, the mating point between the end cover and the rotating shaft is a critical sealing component, and its sealing performance directly affects the equipment's protection against media leakage, operating efficiency, and service life.

[0003] Existing pump end cover sealing structures often suffer from insufficient sealing reliability and are prone to seal failure due to shaft rotation wear. Some structures also have limited adaptability. After long-term use, the sealing surface fit decreases, easily leading to media leakage and increased energy consumption. This can even affect the overall operational stability of the equipment, making it difficult to meet the long-term and stable sealing requirements under complex operating conditions. Therefore, optimizing the relevant sealing rings has always been a direction for technological improvement. Utility Model Content

[0004] The problem to be solved by this utility model is to provide a pump end cover sealing structure and a gear pump.

[0005] To solve the above problems, on the one hand, this utility model provides a pump end cover sealing structure. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows: A pump end cap sealing structure includes: an end cap having a through central hole; a rotating shaft passing through the central hole; and a sealing ring including a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being arranged mirror images of each other, the inner ring of the sealing ring contacting the outer wall of the rotating shaft, and the outer ring of the sealing ring contacting the inner wall of the central hole; wherein, one side of the shaft end of the sealing ring has an annular groove, the openings of the annular grooves of the first sealing ring and the second sealing ring are in opposite directions, the sealing ring having a convex peak and a convex tongue, the convex peak and the convex tongue forming a plurality of conical surfaces on the inner wall of the sealing ring, the generatrices of adjacent conical surfaces forming an angle with each other, the conical surfaces including a first conical surface and a second conical surface formed by the convex peak, and also including a third conical surface formed by the convex tongue.

[0006] As a further improvement of this utility model, the annular groove divides the sealing ring into an outer ring and an inner ring, the convex peak is located in the same axial position as the annular groove, the convex tongue is a cantilever structure, and the convex tongue is not located in the same axial position as the annular groove.

[0007] As a further improvement of this utility model, the outer wall of the inner ring has an externally convex bulge portion, which narrows the radial dimension of the opening of the annular groove.

[0008] As a further improvement of this utility model, the rotating shaft includes a spline section and a smooth shaft section, and the sealing ring is in contact with the smooth shaft section.

[0009] As a further improvement of this utility model, when the first sealing ring, the second sealing ring, and the rotating shaft are assembled, the first sealing ring and the second sealing ring are pressed and contacted against each other along the axial direction.

[0010] As a further improvement of this utility model, the included angle formed at the junction of the first conical surface and the second conical surface is an anomalous angle greater than 180° and less than 270°, and the included angle formed at the junction of the second conical surface and the third conical surface is an obtuse angle.

[0011] As a further improvement of this utility model, the sealing ring is made of nitrile rubber.

[0012] As a further improvement of this utility model, one side of the end cap has a blind hole, and a positioning pin is installed in the blind hole, the axis of the positioning pin being longer than the axis of the blind hole.

[0013] As a further improvement of this utility model, a sealing ring is fitted on one side of the end cap, and the area enclosed by the sealing ring is larger than the area enclosed by the sealing ring; the positioning pin is located outside the sealing ring, and two positioning pins are symmetrically distributed on both sides of the sealing ring.

[0014] On the other hand, a gear pump includes the pump end cap sealing structure as described above.

[0015] The beneficial technical effects of adopting the pump end cover sealing structure of this application are: The first and second sealing rings are arranged in a mirror-symmetrical manner, and the inner and outer rings of the sealing rings are in close contact with the outer wall of the rotating shaft and the inner wall of the central hole of the end cover, respectively, forming a double sealing contact structure. This significantly improves the sealing fit, effectively enhances sealing reliability, and reduces the risk of media leakage.

[0016] The inner wall of the sealing ring is wavy, not smooth. It consists of multiple conical surfaces formed by convex peaks and tongues, with their generatrices forming angles with each other. This structure creates multiple contact lines and can also disperse the contact stress generated when the rotating shaft rotates, slowing down the wear rate of the sealing surface, preventing a decrease in the sealing fit after long-term use, and extending the service life of the sealing structure.

[0017] The annular groove effectively hollows out the interior of the sealing ring, improving its elastic adaptability. However, because the annular groove only opens at one end of the sealing ring, the elastic collapse performance at both ends of a single sealing ring differs. Therefore, two symmetrical sealing rings are used to compensate for this drawback.

[0018] The symmetrical arrangement of sealing rings and the multi-conical surface design not only ensure the rotational freedom of the rotating shaft, but also better adapt to the dynamic operating state of the shaft system, improve the adaptability of the sealing structure to the operating conditions of the equipment, and to a certain extent make up for the limited adaptability of the existing structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of one embodiment of the pump end cover sealing structure of this utility model; Figure 2 This is a perspective view of one embodiment of the pump end cover sealing structure of this utility model; Figure 3 This is an axial view of one embodiment of the pump end cover sealing structure of this utility model; Figure 4 This is a cross-sectional view (AA) of one embodiment of the pump end cover sealing structure of this utility model; Figure 5 This is a partial enlarged view at point B of one embodiment of the pump end cover sealing structure of this utility model; Figure 6 This is a front view of the sealing ring of one embodiment of the pump end cover sealing structure of this utility model; Figure 7 This is a CC cross-sectional view of one embodiment of the pump end cover sealing structure of this utility model.

[0021] 1-Rotating shaft; 101-Spline section; 102-Optical shaft section; 2-First sealing ring; 3-Second sealing ring; 231-Annular groove; 232-Protruding peak; 233-Protruding tongue; 234-Protruding bulge; 235-First conical surface; 236-Second conical surface; 237-Third conical surface; 238-Outer ring; 239-Inner ring; 4-End cap; 401-Central hole; 402-Blind hole; 5-Sealing ring; 6-Positioning pin. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments: To achieve the purpose of this utility model, please refer to Figures 1 to 7A pump end cap sealing structure includes: an end cap 4 having a through central hole 401; a rotating shaft 1 passing through the central hole 401; and a sealing ring, the flexible sealing ring including a first sealing ring 2 and a second sealing ring 3, the first sealing ring 2 and the second sealing ring 3 being arranged mirror images of each other, the inner ring of the sealing ring contacting the outer wall of the rotating shaft 1, and the outer ring of the sealing ring contacting the inner wall of the central hole 401. Wherein, as... Figure 7 As shown, one side of the sealing ring has an annular groove 231. The openings of the annular grooves 231 of the first sealing ring 2 and the second sealing ring 3 are in opposite directions. The sealing ring has a convex peak 232 and a convex tongue 233. The convex peak 232 and the convex tongue 233 form a plurality of conical surfaces on the inner wall of the sealing ring. The generatrices of adjacent conical surfaces are at an angle to each other. The conical surfaces include a first conical surface 235 and a second conical surface 236 formed by the convex peak 232, and a third conical surface 237 formed by the convex tongue 233.

[0023] The first sealing ring 2 and the second sealing ring 3 can be components of the same specification, only their placement and orientation are different.

[0024] The beneficial effects of adopting the above technical solution are as follows: The first sealing ring 2 and the second sealing ring 3, which are two sealing rings arranged in opposite directions, mainly ensure the rotational freedom of the rotating shaft 1 while ensuring the sealing performance at the assembly point between the rotating shaft 1 and the end cover 4. This forms a double sealing structure, significantly improving the sealing fit and reliability, and effectively preventing media leakage. The inner wall of the sealing ring is formed by multiple conical surfaces from the convex peaks 232 and the convex tongues 233. The generatrices of adjacent conical surfaces form an angle with each other, constituting multiple contact lines, which can disperse the contact stress when the rotating shaft 1 rotates, reduce wear, and extend the service life of the sealing structure.

[0025] like Figure 7 As shown, in some other embodiments of this utility model, the annular groove 231 divides the sealing ring into an outer ring 238 and an inner ring 239. The convex peak 232 is located in the same axial position as the annular groove 231 of the sealing ring. The convex tongue 233 is a cantilever structure and is not located in the same axial position as the annular groove 231.

[0026] When cross-sections are performed at the same axial position, both sections are cut. That is, their radial projections overlap.

[0027] The outer ring 238 and the inner ring 239 make the cross-section of the annular groove 231 U-shaped at any position.

[0028] The beneficial effects of adopting the above technical solution are: the tongue 233 is designed as a cantilever structure and is staggered from the annular groove 231, which enhances the elastic deformation capability of the sealing ring and its adaptability to the dynamic operation of the shaft system, and helps to maintain the long-term fit of the sealing surface.

[0029] like Figure 7 As shown, in some other embodiments of the present invention, the outer wall of the inner ring 239 has an externally convex bulge 234, which narrows the radial dimension of the opening of the annular groove 231.

[0030] The beneficial effects of adopting the above technical solution are: narrowing the radial dimension of the opening of the annular groove 231 can further limit the permeation path of the medium along the direction of the annular groove 231, and improve the static and dynamic sealing effect of the sealing structure.

[0031] In some other embodiments of this utility model, the rotating shaft includes a spline section 101 and an optical shaft section 102, and the sealing ring is in contact with the optical shaft section 102.

[0032] Optical axis segment 102 is the cylindrical segment.

[0033] The beneficial effects of adopting the above technical solution are: the spline segment 101 is used for assembly with the outside world to transmit rotational power.

[0034] like Figure 5 As shown, in some other embodiments of this utility model, when the first sealing ring 2, the second sealing ring 3, and the rotating shaft 1 are assembled, the first sealing ring 2 and the second sealing ring 3 are in axial elastic compression contact with each other.

[0035] The beneficial effects of adopting the above technical solution are: the opposing compression contact forms an axial pre-tight seal, which enhances the bonding force between the two sealing rings and the overall sealing rigidity, and prevents leakage when pressure fluctuates or shaft movement occurs.

[0036] In some other embodiments of this utility model, the included angle formed at the junction of the first conical surface 235 and the second conical surface 236 is an anomalous angle greater than 180° and less than 270°, and the included angle formed at the junction of the second conical surface 236 and the third conical surface 237 is an obtuse angle.

[0037] The beneficial effects of adopting the above technical solution are: this angle design optimizes the transition and support relationship between each conical surface, helps to form a more stable multi-line contact seal, and improves stress distribution.

[0038] In some other embodiments of this invention, the sealing ring is made of nitrile rubber.

[0039] The beneficial effects of adopting the above technical solution are: the nitrile rubber material has good oil resistance, elasticity and wear resistance, is suitable for the oil environment inside the pump, and can maintain shape stability and sealing performance during long-term use.

[0040] like Figure 1 , Figure 4As shown, in some other embodiments of this utility model, one side of the end cap 4 has a blind hole 402, and a positioning pin 6 is installed in the blind hole 402. The axis of the positioning pin 6 is longer than the axis of the blind hole 402.

[0041] The beneficial effects of adopting the above technical solution are: the positioning pin 6 facilitates the docking and assembly of the end cover 4 with the pump body, ensuring the accuracy of the docking.

[0042] like Figure 1 , Figure 4 As shown, in some other embodiments of this utility model, a sealing ring 5 is fitted on one side of the end cap 4, and the area enclosed by the sealing ring 5 is larger than the area enclosed by any one of the sealing rings. Positioning pins 6 are located outside the sealing ring 5, and two positioning pins 6 are symmetrically distributed on both sides of the sealing ring 5.

[0043] like Figure 1 As shown, the sealing ring 5 is a rhombus with rounded corners.

[0044] The beneficial effects of adopting the above technical solution are: the combination of large-area static sealing between the end cover and the pump body and precise positioning makes the overall sealing system more complete and reliable.

[0045] A gear pump includes the pump end cap sealing structure as described above.

[0046] The beneficial effects of adopting the above technical solution are: it significantly improves the sealing performance of the pump body at the extended end of the rotating shaft, reduces the risk of leakage, and enhances its operational stability under complex working conditions.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pump end cover sealing structure, characterized in that, include: End cap, with a through-hole in the center; The rotating shaft passes through the central hole; The sealing ring includes a first sealing ring and a second sealing ring, which are arranged in a mirror-symmetric manner. The inner ring of the sealing ring contacts the outer wall of the rotating shaft, and the outer ring of the sealing ring contacts the inner wall of the central hole. The sealing ring has an annular groove on one side of its shaft end. The openings of the annular grooves of the first and second sealing rings are in opposite directions. The sealing ring has a convex peak and a convex tongue. The convex peak and the convex tongue form a plurality of conical surfaces on the inner wall of the sealing ring. The generatrices of adjacent conical surfaces are at an angle to each other. The conical surfaces include a first conical surface and a second conical surface formed by the convex peak, and a third conical surface formed by the convex tongue.

2. The pump end cover sealing structure according to claim 1, characterized in that: The annular groove divides the sealing ring into an outer ring and an inner ring. The convex peak is located in the same axial position as the annular groove of the sealing ring. The convex tongue is a cantilever structure and is not located in the same axial position as the annular groove.

3. The pump end cover sealing structure according to claim 2, characterized in that: The outer wall of the inner ring has an externally convex bulge portion that narrows the radial dimension of the opening of the annular groove.

4. The pump end cover sealing structure according to claim 1, characterized in that: The rotating shaft includes a splined section and a smooth shaft section, and the sealing ring is in contact with the smooth shaft section.

5. The pump end cover sealing structure according to claim 1, characterized in that: When the first sealing ring, the second sealing ring, and the rotating shaft are assembled, the first sealing ring and the second sealing ring are pressed against each other along the axial direction.

6. The pump end cover sealing structure according to claim 1, characterized in that: The angle formed at the intersection of the first and second conical surfaces is an anomalous angle greater than 180° and less than 270°, and the angle formed at the intersection of the second and third conical surfaces is an obtuse angle.

7. The pump end cover sealing structure according to claim 1, characterized in that: The sealing ring is made of nitrile rubber.

8. The pump end cover sealing structure according to claim 1, characterized in that: One side of the end cap has a blind hole, and a positioning pin is fitted inside the blind hole. The axis of the positioning pin is longer than the axis of the blind hole.

9. The pump end cover sealing structure according to claim 8, characterized in that: One side of the end cap is fitted with a sealing ring, and the area enclosed by the sealing ring is larger than the area enclosed by the sealing ring. The locating pins are located outside the sealing ring, and two locating pins are symmetrically distributed on both sides of the sealing ring.

10. A gear pump, characterized in that: Includes the pump end cap sealing structure as described in any one of claims 1 to 9.

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