Mechanical shaft seal structure
By setting grooves on the contact surface of the mechanical shaft seal structure and combining the spring-piece pressing design, the liquid leakage and noise problems in the prior art are solved, and efficient sealing and lubricity are improved.
Patent Information
- Application Number
- CN202421047347.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing mechanical shaft seal structures are prone to wear of the static and dynamic rings during operation, resulting in liquid leakage and noise increase, and it is difficult to effectively prevent external impurities from contaminating.
At least one groove is concave on the contact surface of the fixed sealing ring of the first sealing ring and the rotating sealing ring of the second sealing ring, and in combination with the spring member pressing design, forming a liquid stays in the groove and forming a film to block leakage and impurities.
Effectively prevent liquid leakage, reduce noise, increase lubricity, avoid wear of static and dynamic rings, and only allow a very small amount of liquid leakage (<0.01 liters/min), which complies with industry regulations.
Smart Images
Figure CN222746601U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a mechanical shaft seal structure, in particular to a mechanical shaft seal structure with at least one groove arranged on a contact surface to prevent leakage of internal solution, improve lubricity and wear resistance. Background Art
[0002] The shaft seal structure can be seen in common mechanical equipment such as water pumps, washing machines, or various pumps in large factories. The existence of the shaft seal structure can not only prevent foreign matter from invading the interior of the mechanical equipment, but also prevent the liquid transported inside the mechanical equipment from overflowing. It is one of the important parts that allows the mechanical equipment to operate for a long time. In detail, in order to avoid too much loss during the transportation of the medium, and to prevent foreign matter from mixing into the transported material or liquid and causing quality changes, mechanical equipment will often install a shaft seal structure on the rotating shaft to achieve the purpose of internal and external isolation. Different from the oil seal structure that uses rubber gaskets to achieve the sealing effect, the basic structure of the shaft seal structure is composed of a stationary static ring and a dynamic ring that can move with the rotating shaft. Finally, the various parts are combined into one through external forces such as springs. The static ring and the dynamic ring are made of graphite or silicon carbide respectively.
[0003] However, the soft graphite material is easily worn during the operation of the mechanical device, making it impossible for the contact surface between the static ring and the dynamic ring to be effectively sealed, which ultimately causes the liquid transported inside the mechanical device to overflow. Therefore, how to use innovative hardware design to not only effectively prevent the liquid transported inside the mechanical device from overflowing, but also avoid the static ring and the dynamic ring from wearing and getting stuck is a problem that developers and researchers in related industries such as mechanical shaft seal structures need to continue to work hard to overcome and solve. Utility Model Content
[0004] The utility model provides a mechanical shaft seal structure, which aims to provide a mechanical shaft seal structure with at least one groove arranged on a contact surface to prevent leakage of an internal solution, improve lubricity and wear resistance. The structure mainly adopts a hardware design in which at least one groove is arranged on one of the contact surfaces of a fixed sealing ring of a first sealing ring and a rotating sealing ring of a second sealing ring or both of them. In addition to effectively pressing the first sealing ring and the second sealing ring by a spring member to achieve a sealing effect, the liquid transported through the contact surface of the first sealing ring and the second sealing ring can stay in a very small space of the groove and form a thin film with each other, so as to effectively prevent the transported liquid from leaking to the outside or prevent contamination by impurities in the external air, and effectively increase the lubricity, make the first sealing ring and the second sealing ring not easily suffer from physical wear and stuck, and only allow a very small amount of transported liquid to leak (less than 0.01 liters / minute) to meet industry regulations, and not easily generate a lot of noise when the liquid is transported.
[0005] According to the purpose of the utility model, the technical means adopted by the utility model are as follows.
[0006] The utility model provides a mechanical shaft seal structure, which at least includes a first sealing ring and a second sealing ring in contact with the first sealing ring, wherein a first contact surface of the first sealing ring contacts a second contact surface of the second sealing ring, and the main feature is that at least one of the first contact surface or the second contact surface or both of them is concavely provided with at least one groove.
[0007] In an embodiment of the present invention, the first sealing ring is a fixed sealing ring, and the second sealing ring is a rotating sealing ring.
[0008] In one embodiment of the present invention, the first sealing ring and the second sealing ring are respectively made of one of the materials such as silicon carbide (chemical formula SiC), tungsten carbide (chemical formula WC), aluminum oxide (chemical formula Al2O3) or graphite (chemical formula C).
[0009] In one embodiment of the present invention, the cross-sectional area of the groove is not greater than 50% of the cross-sectional area of the first sealing ring or the second sealing ring.
[0010] In an embodiment of the present invention, the groove is formed by a method such as molding or drilling.
[0011] In an embodiment of the present invention, a groove is formed on one of the first contact surface or the second contact surface.
[0012] In an embodiment of the present invention, the groove is a groove arranged around one of the first contact surface or the second contact surface.
[0013] In an embodiment of the present invention, one of the first contact surface or the second contact surface is concavely provided with a plurality of grooves.
[0014] In an embodiment of the present invention, the groove is a groove arranged around one of the first contact surface or the second contact surface and distributed in concentric circles.
[0015] In an embodiment of the present invention, the grooves are distributed continuously or discontinuously.
[0016] In an embodiment of the present invention, when the grooves are distributed discontinuously, the grooves are in a circular, elliptical, rectangular or irregular shape.
[0017] In an embodiment of the present invention, a groove is respectively formed on the first contact surface and the second contact surface.
[0018] In an embodiment of the present invention, the recess is a groove arranged around the first contact surface and the second contact surface.
[0019] In an embodiment of the present invention, the first contact surface and the second contact surface are respectively provided with a plurality of grooves.
[0020] In an embodiment of the present invention, the grooves are grooves respectively arranged around the first contact surface and the second contact surface and distributed in concentric circles.
[0021] In an embodiment of the present invention, the grooves are distributed continuously or discontinuously.
[0022] In an embodiment of the present invention, when the grooves are distributed discontinuously, the grooves are in a circular, elliptical, rectangular or irregular shape.
[0023] In an embodiment of the present invention, a spring member may be further connected to the other end of the second sealing ring away from the first sealing ring.
[0024] The technical effect produced by the utility model: the mechanical shaft seal structure of the utility model mainly adopts the hardware design of at least one groove being recessed in one of the contact surfaces of the fixed sealing ring of the first sealing ring and the rotating sealing ring of the second sealing ring or both. In addition to effectively pressing the first sealing ring and the second sealing ring by the spring member to achieve the sealing effect, the liquid transported through the contact surface of the first sealing ring and the second sealing ring can stay in the extremely small space of the groove and form a thin film with each other, so as to effectively prevent the transported liquid from leaking to the outside or prevent the contamination of impurities in the external air, and effectively increase the lubricity, make the first sealing ring and the second sealing ring less likely to be physically worn and stuck, and only allow a very small amount of transported liquid to leak (<0.01 liters / minute) to meet industry regulations, and it is not easy to generate a lot of noise when the liquid is transported. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 : A three-dimensional schematic diagram of the overall structure of a preferred embodiment of the mechanical shaft seal structure of the utility model
[0026] Figure 2 : Schematic diagram of the overall structure of a preferred embodiment of the mechanical shaft seal structure of the utility model
[0027] Figure 3 : Schematic diagram of the overall structure application of a preferred embodiment of the mechanical shaft seal structure of the utility model
[0028] Figure 4: Schematic diagram of groove distribution of a preferred embodiment of the mechanical shaft seal structure of the utility model
[0029] Figure 5 : A cross-sectional view of the overall structure of a preferred embodiment of the mechanical shaft seal structure of the utility model
[0030] Figure 6 : Schematic diagram of groove distribution of the second preferred embodiment of the mechanical shaft seal structure of the utility model
[0031] Figure 7 : Schematic diagram of groove distribution of the third preferred embodiment of the mechanical shaft seal structure of the utility model
[0032] Figure 8 : Schematic diagram of groove distribution of four preferred embodiments of the mechanical shaft seal structure of the utility model
[0033] Fig. 9 : Schematic diagram of groove distribution of the fifth preferred embodiment of the mechanical shaft seal structure of the utility model
[0034] Fig.10 : A sectional view of the overall structure of a fifth preferred embodiment of the mechanical shaft seal structure of the present invention.
[0035] Explanation of symbols:
[0036] 1: Mechanical shaft seal structure
[0037] 11: First sealing ring
[0038] 111: First contact surface
[0039] 12: Second sealing ring
[0040] 121: Second contact surface
[0041] 13: Groove
[0042] 14: Spring parts. DETAILED DESCRIPTION
[0043] First, see Figures 1 to 31 and 2 are a schematic diagram of the overall structure of a preferred embodiment of the mechanical shaft seal structure of the present invention, a schematic diagram of the overall structure decomposition, and a schematic diagram of the overall structure application. The mechanical shaft seal structure 1 of the present invention is provided for use in a mechanical device (not shown in the figure) of a water pumping motor or a pump, and can effectively achieve mechanical sealing, packing sealing or dynamic sealing to prevent the leakage of the liquid (not shown in the figure) transported inside the mechanical device. The mechanical shaft seal structure 1 is composed of at least a first sealing ring 11, a second sealing ring 12, at least one groove 13 and a spring member 14. Thus, the mechanical shaft seal structure 1 of the present invention is mainly formed by the fixed sealing ring of the first sealing ring 11 and the rotating sealing ring of the second sealing ring 12. The hardware design of at least one groove 13 is provided on each contact surface or both of them. In addition to effectively pressing the first sealing ring 11 and the second sealing ring 12 by the spring member 14 to achieve a sealing effect, the liquid transported through the contact surface of the first sealing ring 11 and the second sealing ring 12 can stay in the extremely small space of the groove 13 and form a thin film with each other, so as to effectively prevent the transported liquid from leaking to the outside or prevent contamination by impurities in the external air, and effectively increase the lubricity, make the first sealing ring 11 and the second sealing ring 12 less likely to be physically worn and stuck, and only allow a very small amount of transported liquid to leak (less than 0.01 liters / minute) to meet industry regulations, and it is not easy to generate a lot of noise when the liquid is transported.
[0044] The mechanical shaft seal structure at least comprises the first sealing ring 11, the second sealing ring 12, at least the groove 13 and the spring member 14, and the first sealing ring 11 and the second sealing ring 12 are correspondingly covered, wherein the first sealing ring 11 is a fixed sealing ring, that is, the first sealing ring 11 is a stationary ring, and the second sealing ring 12 is a rotating sealing ring, that is, a dynamic ring, and the first sealing ring 11 and the second sealing ring 12 are respectively made of silicon carbide (SiC), tungsten carbide (WC), aluminum oxide (Al2O3) or graphite (Graphite) or the like. A material is prepared; in a preferred embodiment of the present invention, the fixed sealing ring of the first sealing ring 11 is prepared from a graphite material, and the rotating sealing ring of the second sealing ring 12 is prepared from a silicon carbide (SiC) material; in addition, the groove 13 is formed by a method such as mold closing or drilling. In a preferred embodiment of the present invention, the groove 13 is formed by a mold closing method, that is, the first sealing ring 11 or the second sealing ring 12 is set on a mold (not shown) having a plurality of protrusions and is formed by pressurizing.
[0045] Furthermore, the mutually contacting first contact surface 111 of the first sealing ring 11 and the second contact surface 121 of the second sealing ring 12 are in contact with each other, wherein one of the first contact surface 111 or the second contact surface 121 is concavely provided with at least one of the grooves 13, or both of the first contact surface 111 or the second contact surface 121 are concavely provided with at least one of the grooves 13; furthermore, the total cross-sectional area of the grooves 13 is not greater than 50% of the cross-sectional area of the first sealing ring 11 or the second sealing ring 12, which can effectively prevent leakage of the liquid transported inside the mechanical equipment.
[0046] The spring member 14 is disposed at the other end of the second sealing ring 12 away from the first sealing ring 11 , wherein the spring member 14 can help the first sealing ring 11 and the second sealing ring 12 to be tightly sealed by its elastic force.
[0047] Please also read Figure 4 and Figure 5 , which is a schematic diagram of the groove distribution of a preferred embodiment of the mechanical shaft seal structure of the utility model, and a cross-sectional view of the overall structure, wherein the first contact surface 111 of the first sealing ring 11 is recessed with a plurality of grooves 13, and the second contact surface 121 of the second sealing ring 12 is a complete plane without recessed grooves 13, and the grooves 13 are distributed in concentric circles with the first contact surface 111 of the first sealing ring 11, wherein each of the grooves 13 is a discontinuous circle, and each of the grooves 13 is equidistantly distributed with another groove 13 (such as Figure 4 As shown in the figure, when the first sealing ring 11 and the second sealing ring 12 are correspondingly covered and the first contact surface 111 and the second contact surface 121 are in contact with each other, the liquid flowing through the first contact surface 111 and the second contact surface 121 will leak into the circular groove 13 to form a thin film between the first contact surface 111 and the second contact surface 121, which can effectively prevent the liquid from leaking.
[0048] Please also read Figure 6 FIG. 1 is a schematic diagram of the groove distribution of the second preferred embodiment of the mechanical shaft seal structure of the utility model, wherein Figure 6 The second preferred embodiment shown in the figure differs from the first preferred embodiment described above only in the shape of the groove 13. The groove 13 of the second preferred embodiment is a discontinuous ellipse. When the first contact surface 111 of the first sealing ring 11 having the elliptical groove 13 corresponds to and contacts the second contact surface 121 of the second sealing ring 12 having a complete plane, the liquid flowing through the first contact surface 111 and the second contact surface 121 will leak into the elliptical groove 13 to form a thin film between the first contact surface 111 and the second contact surface 121, thereby effectively preventing the liquid from leaking.
[0049] Please also read Figure 7FIG. 1 is a schematic diagram of the groove distribution of the third preferred embodiment of the mechanical shaft seal structure of the utility model, wherein Figure 7 The difference between the third preferred embodiment shown and the first or second preferred embodiments mentioned above still lies in the shape of the groove 13. The groove 13 of the third preferred embodiment is a continuous circular ring shape arranged on the first contact surface 111 of the first sealing ring 11, and the groove 13 and the first contact surface 111 of the first sealing ring 11 are distributed in concentric circles. When the first contact surface 111 of the groove 13 of the first sealing ring 11 with a circular ring corresponds to and contacts the second contact surface 121 of the second sealing ring 12 with a complete plane, the liquid flowing through the first contact surface 111 and the second contact surface 121 will leak into the groove 13 to form a thin film between the first contact surface 111 and the second contact surface 121, which can effectively prevent the liquid from leaking.
[0050] Please also read Figure 8 FIG. 1 is a schematic diagram of the groove distribution of four preferred embodiments of the mechanical shaft seal structure of the utility model, wherein Figure 8 The difference between the fourth preferred embodiment shown and the third preferred embodiment mentioned above still lies in the number of the grooves 13. The grooves 13 of the fourth preferred embodiment are in the shape of two continuous circular rings arranged on the first contact surface 111 of the first sealing ring 11, and the grooves 13 and the first contact surface 111 of the first sealing ring 11 are distributed in concentric circles. When the first contact surface 111 of the first sealing ring 11 with the grooves 13 having two circular rings corresponds to and contacts the second contact surface 121 of the second sealing ring 12 with a complete plane, the liquid flowing through the first contact surface 111 and the second contact surface 121 will leak into the grooves 13 to form a thin film between the first contact surface 111 and the second contact surface 121, which can effectively prevent the liquid from leaking.
[0051] Please also read Fig. 9 and Fig.10 FIG. 1 is a schematic diagram of the groove distribution of the fifth preferred embodiment of the mechanical shaft seal structure of the utility model, and a cross-sectional view of the overall structure, wherein Fig. 9 The difference between the fifth preferred embodiment shown in the figure and the first preferred embodiment described above is still the location of the groove 13. Unlike the first preferred embodiment, the groove 13 is only arranged on the first contact surface 111 of the first sealing ring 11. The first contact surface 111 of the first sealing ring 11 and the second contact surface 121 of the second sealing ring 12 of the fifth preferred embodiment are both provided with discontinuous circular grooves 13, and the grooves 13 of the first contact surface 111 and the grooves of the second contact surface 121 can be aligned or not. Fig.10The grooves 13 on both sides of the fifth preferred embodiment are aligned. When the first contact surface 111 of the first sealing ring 11 and the second contact surface 121 of the second sealing ring 12 correspond to and contact each other, the liquid flowing through the first contact surface 111 and the second contact surface 121 will leak into the grooves 13 on both sides, and a thin film can be formed between the first contact surface 111 and the second contact surface 121 to effectively prevent the liquid from leaking.
[0052] However, it must be noted that the types, shapes, numbers or alignment states of the grooves 13 in the above-mentioned preferred embodiments are for the convenience of explanation and are not limited to the present invention. Those skilled in the art should know that the grooves 13 can have any different settings, as long as a small space can be formed between the first contact surface 111 of the first sealing ring 11 and the second contact surface 121 of the second sealing ring 12 so that the transported liquid can be injected and form a thin film to prevent the liquid from leaking, and it will not affect the actual implementation of the present invention.
[0053] It can be seen from the above implementation description that compared with the existing technology and products, the utility model has the following advantages:
[0054] The mechanical shaft seal structure of the utility model mainly adopts the hardware design that at least one groove is recessed on one of the contact surfaces of the fixed sealing ring of the first sealing ring and the rotating sealing ring of the second sealing ring or both of them. In addition to effectively pressing the first sealing ring and the second sealing ring by the spring member to achieve the sealing effect, the liquid transported through the contact surface of the first sealing ring and the second sealing ring can stay in the extremely small space of the groove and form a thin film with each other, so as to effectively prevent the transported liquid from leaking to the outside or prevent the contamination of impurities in the external air, and effectively increase the lubricity, make the first sealing ring and the second sealing ring less likely to be physically worn and stuck, and only allow a very small amount of transported liquid to leak (<0.01 liters / minute) to meet industry regulations, and it is not easy to generate a lot of noise when the liquid is transported.
Claims
1. A mechanical shaft seal structure, comprising a first sealing ring (11), and a second sealing ring (12) in contact with the first sealing ring (11), wherein a first contact surface (111) of the first sealing ring (11) contacts a second contact surface (121) of the second sealing ring (12), characterized in that: A groove (13) is formed in one or both of the first contact surface (111) and the second contact surface (121).
2. The mechanical shaft seal structure according to claim 1, characterized in that: The first sealing ring (11) is a fixed sealing ring, and the second sealing ring (12) is a rotating sealing ring.
3. The mechanical shaft seal structure according to claim 1, characterized in that: The cross-sectional area of the groove (13) is not greater than 50% of the cross-sectional area of the first sealing ring (11) or the second sealing ring (12).
4. The mechanical shaft seal structure according to claim 1, characterized in that: One of the first contact surface (111) or the second contact surface (121) is provided with a groove (13).
5. The mechanical shaft seal structure according to claim 4, characterized in that: The groove (13) is a groove arranged around one of the first contact surface (111) or the second contact surface (121).
6. The mechanical shaft seal structure according to claim 1, characterized in that: One of the first contact surface (111) or the second contact surface (121) is provided with a plurality of grooves (13).
7. The mechanical shaft seal structure according to claim 6, characterized in that: The grooves (13) are grooves arranged around one of the first contact surface (111) or the second contact surface (121) and distributed in concentric circles.
8. The mechanical shaft seal structure according to claim 7, characterized in that: The grooves (13) are either continuously distributed or discontinuously distributed.
9. The mechanical shaft seal structure according to claim 8, characterized in that: When the grooves (13) are distributed discontinuously, the grooves (13) are circular, elliptical, rectangular or irregular in shape.
10. The mechanical shaft seal structure according to claim 1, characterized in that: The first contact surface (111) and the second contact surface (121) are respectively provided with a groove (13).
11. The mechanical shaft seal structure according to claim 10, characterized in that: The groove (13) is a groove arranged around the first contact surface (111) and the second contact surface (121).
12. The mechanical shaft seal structure according to claim 1, characterized in that: The first contact surface (111) and the second contact surface (121) are respectively provided with a plurality of grooves (13).
13. The mechanical shaft seal structure according to claim 12, characterized in that: The plurality of grooves (13) on the first contact surface (111) and the plurality of grooves (13) on the second contact surface (121) are arranged in alignment with each other.
14. The mechanical shaft seal structure according to claim 12, characterized in that: The plurality of grooves (13) of the first contact surface (111) and the plurality of grooves (13) of the second contact surface (121) are not arranged in alignment with each other.
15. The mechanical shaft seal structure according to claim 12, characterized in that: The grooves (13) are grooves respectively arranged around the first contact surface (111) and the second contact surface (121) and distributed in concentric circles.
16. The mechanical shaft seal structure according to claim 15, characterized in that: The grooves (13) are either continuously distributed or discontinuously distributed.
17. The mechanical shaft seal structure according to claim 16, characterized in that: When the grooves (13) are distributed discontinuously, the grooves (13) are circular, elliptical, rectangular or irregular in shape.
18. The mechanical shaft seal structure according to claim 1, characterized in that: The other end of the second sealing ring (12) away from the first sealing ring (11) is further connected to a spring component (14).