Sealing assembly with lip seal, rotor pump sealing assembly and cam pump sealing assembly

Abstract

The utility model discloses a sealing assembly with a lip-shaped seal, a rotor pump and a cam pump sealing group, and relates to the technical field of mechanical sealing, the sealing assembly is composed of a sealing cavity 1 and a shaft sleeve 2 matched with the sealing cavity 1, the upper part and the lower part of the sealing cavity 1 extend to form assembly tables 11 respectively, and the assembly tables 11 are provided with pump position screw holes 16; more than two step seal sealing grooves 12 are formed in the inner wall of the sealing cavity 1; each step seal sealing groove 12 is provided with a lip-shaped sealing ring 13 and an O-shaped ring for radially compensating the lip-shaped sealing ring 13; one end of the shaft sleeve 2 is provided with more than three fastening screw holes 21 which are arranged along the circumference; the inner wall of the shaft sleeve 2 is provided with more than two shaft sleeve sealing grooves 22, and the shaft sleeve sealing grooves 22 are provided with O-shaped rings. The sealing assembly solves the traditional sealing problem, food safety is guaranteed, efficient sealing is achieved, the service life is prolonged, assembling is convenient, operation is stable, and auxiliary synergy is achieved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a sealing assembly with a lip seal, a rotor pump sealing assembly, and a cam pump sealing assembly. Background Technology

[0002] In the food processing industry, equipment such as cam pumps and rotary pumps often face the problem of sealing failure when conveying high-viscosity materials (such as syrup and honey). Traditional mechanical seals use a structure where springs compress the moving and stationary rings, but when the machine stops, the material easily cools and solidifies on the spring, leading to spring failure and seal leakage. It is necessary to install flushing holes to frequently use high-temperature cleaning water to soften the material, but the residue of the cleaning water may introduce microbial contamination, affecting food safety.

[0003] Therefore, it is of great significance to propose a sealing component that can maintain the sealing effect without high-temperature water rinsing. Utility Model Content

[0004] The purpose of this utility model is to avoid the shortcomings of the prior art and provide a sealing component with a lip seal, a rotor pump sealing component, and a cam pump sealing component that solves the traditional sealing problem, ensures food safety, provides efficient sealing, extends service life, is easy to assemble, operates stably, and provides auxiliary efficiency enhancement.

[0005] The above-mentioned objectives of this utility model are achieved through the following technical means:

[0006] A sealing assembly with a lip seal consists of a sealing cavity 1 and a matching bushing 2.

[0007] The sealing cavity 1 has an assembly platform 11 extending from the upper and lower sides. The assembly platform 11 is provided with a pump position screw hole 16. The inner wall of the sealing cavity 1 is provided with two or more step seal grooves 12. The step seal groove 12 is provided with a lip seal ring 13 and an O-ring for radial compensation of the lip seal ring 13.

[0008] One end of the bushing 2 has three or more set screw holes 21 arranged in a circle; the inner wall of the bushing 2 is provided with two or more bushing sealing grooves 22, and the bushing sealing grooves 22 are provided with O-rings.

[0009] Optionally, the lip seal 13 is a PTFE ring.

[0010] Preferably, the PTFE ring is a sealing ring made of carbon fiber material.

[0011] Furthermore, after the sealing cavity 1 is assembled to the pump body through the pump position screw hole 16 and the shaft sleeve 2 is assembled to the pump shaft through the set screw hole 21, the lip seal ring 13 forms a sealing structure for the shaft sleeve 2, and the O-ring of the shaft sleeve sealing groove 22 forms a sealing structure for the pump shaft.

[0012] Furthermore, a lubrication groove 14 is provided between adjacent sealing grooves 12, and the lubrication groove 14 is provided with lubricating oil.

[0013] Preferably, the assembly table 11 and the end of the sealing cavity 1 form a positioning stop 15.

[0014] Preferably, the other end of the bushing 2 has a retaining portion 23.

[0015] Preferably, a flat round gasket 3 is provided at the end of the sealing cavity 1 away from the set screw hole 21.

[0016] This utility model also discloses a rotary pump sealing assembly, wherein the sealing assembly with lip seal is assembled on the rotary pump, wherein the sealing cavity 1 is assembled to the pump body of the rotary pump with screws through the pump position screw hole 16, and the bushing 2 is assembled to the pump shaft of the rotary pump with set screws through the set screw hole 21.

[0017] This utility model also discloses a cam pump sealing assembly, wherein the sealing assembly with lip seal is assembled on the cam pump, wherein the sealing cavity 1 is assembled to the pump body of the cam pump with screws through the pump position screw hole 16, and the bushing 2 is assembled to the pump shaft of the cam pump with set screws through the set screw hole 21.

[0018] The beneficial effects of adopting the above technical solution are as follows:

[0019] 1) Solve the traditional sealing problem: For the problem of spring failure and leakage of traditional mechanical seals when cam pumps and rotor pumps are conveying high-viscosity materials, there is no need for high-temperature water flushing, avoiding the risk of material cooling and solidification of springs and residual pollution from cleaning water, thus overcoming the shortcomings of traditional methods.

[0020] 2) Ensure food safety: Eliminate flushing holes and high-temperature cleaning water to prevent the introduction of microbial contamination and meet the stringent hygiene standards of the food industry.

[0021] 3) High-efficiency sealing: Unique multi-stage dynamic sealing, with the peak contact of the lip seal ring rubbing against the shaft, the step seal groove working in tandem, and the O-ring of the bushing rubbing against the sealing cavity, providing double multi-stage protection against material and media leakage.

[0022] Extended lifespan: O-ring radial compensation lip seals, combined with high-quality sealing materials (such as PTFE, carbon fiber synthetic PTFE), compensate for wear, reduce component replacement, and lower costs.

[0023] 4) Easy to assemble: The sealing cavity and shaft sleeve are easy to pre-assemble and can be accurately fixed to the pump body and pump shaft through the screw holes. Although there is resistance in the shaft sleeve, it can still be finely adjusted, making the installation efficient and accurate.

[0024] 5) Stable operation: With the cooperation of multiple structures, the relative movement of the sealing cavity, bushing, and pump shaft is stable during operation, adapting to both dynamic and static working conditions, preventing material leakage, and ensuring equipment reliability.

[0025] 6) Auxiliary enhancements: Lubrication grooves reduce friction, assist in sealing, and provide heat dissipation and shock absorption; positioning stops provide precise positioning, increase stability, reduce sway, and simplify installation; stop parts assist in positioning, limit axial movement, and support the load-bearing structure; round flat gaskets adjust clearance, buffer and reduce shock, and provide pressure equalization and surface protection. Attached Figure Description

[0026] Figure 1 This is a cross-sectional structural diagram of a sealing assembly with a lip seal;

[0027] Figure 2 This is a side view of a sealing assembly with a lip seal.

[0028] Figure 3 This is a schematic diagram of a lip seal ring assembled in a Step seal groove.

[0029] Among them, the sealing cavity is 1; the assembly table is 11; the step seal groove is 12; the lip seal ring is 13; the lubrication groove is 14; the positioning stop is 15; and the pump position screw hole is 16.

[0030] 2. Bushing; 21. Set screw hole; 22. Bushing sealing groove; 23. Set part;

[0031] 3. Round flat washer. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figure 1-3 This illustrates a sealing assembly with a lip seal, comprising a sealing cavity 1 and a mating bushing 2.

[0034] The sealing cavity 1 has an assembly platform 11 extending from the upper and lower sides. The assembly platform 11 is provided with a pump position screw hole 16. The inner wall of the sealing cavity 1 is provided with two or more step seal grooves 12. The step seal groove 12 is provided with a lip seal ring 13 and an O-ring for radial compensation of the lip seal ring 13.

[0035] One end of the bushing 2 has three or more set screw holes 21 arranged in a circle; the inner wall of the bushing 2 is provided with two or more bushing sealing grooves 22, and the bushing sealing grooves 22 are provided with O-rings.

[0036] Sealing principle:

[0037] This sealing assembly employs a multi-stage dynamic seal, implemented as follows:

[0038] The first multi-stage seal of the lip seal ring: when the bushing 2 rotates, as... Figure 3 As shown, the lip seal compensates for the lack of elasticity of the lip seal by using two peak contacts. The two peak contacts dynamically contact and rub against the rotating shaft. The two-stage or higher sealing structure (two or more step seal grooves are set with corresponding sealing structures) prevents material from entering the gap between the sealing cavity and the bushing, thus achieving high-efficiency sealing.

[0039] The second multi-stage seal: When the bushing 2 rotates, the O-ring in the bushing sealing groove 22 rotates and rubs against the sealing cavity. The two-stage or more sealing structures (the inner wall of the bushing 2 has two or more bushing sealing grooves 22 with corresponding sealing structures) prevent the medium from permeating along the pump shaft.

[0040] Radial compensation:

[0041] O-ring radial compensation: The O-ring in the Step seal groove 12 continuously provides radial preload to the lip seal, ensuring that the sealing surfaces are always in contact, compensating for long-term wear of the lip seal, and extending the service life of the sealing structure.

[0042] Assembly process:

[0043] Pre-installation of sealing cavity: O-rings and lip seals 13 are sequentially installed in the step seal groove 12;

[0044] Pre-installation of bushing: O-rings are installed in the bushing sealing groove 22 on the inner wall of the bushing;

[0045] Sealing assembly assembly: Insert the bushing 2 into the sealing cavity. The O-ring provides radial preload to the lip seal, making the lip seal fit tightly against the bushing. As a result, the bushing is still able to move relative to the sealing cavity under considerable resistance.

[0046] Overall assembly:

[0047] The bushing 2 is fitted onto the pump shaft. The sealing cavity is fixed to the pump body through the pump position screw hole 16 on the assembly table. The bushing 2 is fixed to the pump shaft with set screws through the circumferentially distributed set screw holes 21. The sealing cavity is stationary relative to the bushing, while the bushing rotates synchronously with the pump shaft.

[0048] This sealing assembly with a lip seal has the following significant technical advantages:

[0049] Solving the problem of traditional seal failure: Addressing the issues of traditional mechanical seals in food processing equipment such as cam pumps and rotor pumps when conveying high-viscosity materials (e.g., syrup, honey), this sealing component eliminates the need for high-temperature cleaning water to soften the material. It avoids the situation where material cools and solidifies on the spring during shutdown, leading to spring failure and seal leakage. This overcomes the shortcomings of traditional mechanical seals and effectively solves the problem of seal failure.

[0050] Ensuring food safety: Since there is no need to install flushing holes and frequently use high-temperature cleaning water, the risk of microbial contamination introduced by cleaning water residue is avoided, fundamentally ensuring food safety during food processing and meeting the food industry's strict requirements for hygiene and safety.

[0051] High-efficiency sealing performance: Employing a unique multi-stage dynamic sealing design. The two peaks of the lip seal dynamically contact and rub against the shaft during shaft sleeve rotation. Combined with the multi-stage sealing structure formed by multiple step seal grooves, this effectively prevents material from entering the gap between the sealing cavity and the shaft sleeve. Simultaneously, the O-ring in the shaft sleeve sealing groove rotates and rubs against the sealing cavity during shaft sleeve rotation. This multi-stage sealing structure blocks the penetration of media along the pump shaft. The dual multi-stage sealing ensures that the sealing assembly has high-efficiency sealing performance, preventing leakage of high-viscosity materials.

[0052] Extended service life: The O-ring in the Step seal groove can continuously provide radial preload to the lip seal, ensuring that the sealing surface is always in contact, effectively compensating for the long-term wear of the lip seal, significantly extending the overall service life of the sealing structure, reducing the need for frequent replacement of sealing components due to sealing problems, and lowering maintenance costs.

[0053] Facilitates assembly: The sealing cavity and bushing are pre-assembled separately. O-rings and lip seals are installed in the sealing groove of the sealing cavity, and O-rings are installed in the bushing sealing groove on the inner wall of the bushing. Then, the bushing is inserted into the sealing cavity to complete the assembly of the sealing assembly. This pre-assembly method makes the assembly process clearer and simpler. Furthermore, the sealing cavity is fixed to the pump body via the pump mounting screw holes on the assembly table. Although the O-rings will cause the lip seals to fit tightly against the bushing when the bushing is installed, creating significant resistance, the bushing can still move relative to the sealing cavity. This facilitates adjusting the gap between the bushing and the sealing cavity to align with the pump shaft mounting hole. The bushing is fixed to the pump shaft mounting hole using set screws through circumferentially distributed set screw holes. The installation method is clear, easy to operate, and ensures the installation accuracy and stability of the sealing assembly in the equipment.

[0054] Stable and reliable operation: The equipment features two or more sets of sealing structures between the bushing and the pump shaft, and two or more sets of sealing structures between the bushing and the sealing cavity. When the equipment is running, the sealing cavity is stationary relative to the bushing, while the bushing and the pump shaft rotate synchronously. This stable relative sealing friction motion relationship ensures the reliability of the sealing components during dynamic operation and guarantees the stable operation of the equipment when conveying high-viscosity materials.

[0055] For example, such as Figure 1-2 As shown, the lip seal 13 is a PTFE ring. PTFE (polytetrafluoroethylene) lip seals possess excellent corrosion resistance, low coefficient of friction, high temperature resistance, good self-lubricating properties, and superior hygiene.

[0056] For example, such as Figure 1-2 As shown, the PTFE ring, a sealing ring made of carbon fiber material, has enhanced mechanical strength, improved thermal conductivity, improved dimensional stability, and further increased wear resistance.

[0057] For example, such as Figure 1-3 As shown, after the sealing cavity 1 is assembled to the pump body through the pump position screw hole 16 and the shaft sleeve 2 is assembled to the pump shaft through the set screw hole 21, the lip seal ring 13 forms a sealing structure for the shaft sleeve 2, and the O-ring of the shaft sleeve sealing groove 22 forms a sealing structure for the pump shaft.

[0058] Achieving efficient multi-stage sealing: The two peaks of the lip seal ring dynamically contact and rub against the shaft sleeve, combined with the two-stage or higher sealing structure formed by multiple step seal grooves, effectively preventing material from entering the gap between the sealing cavity and the shaft sleeve. Simultaneously, the O-ring within the shaft sleeve sealing groove rotates and rubs against the sealing cavity during shaft sleeve rotation. This two-stage or higher sealing structure further prevents media from permeating along the pump shaft, thus achieving multi-stage sealing of the pump shaft and shaft sleeve, significantly improving the sealing effect and preventing leakage of high-viscosity materials.

[0059] Adaptable to various operating conditions: This sealing structure can adapt to different operating conditions in the food processing industry, such as cam pumps and rotor pumps, when conveying high-viscosity materials. Whether in the dynamic environment of equipment operation or the static environment of shutdown, it maintains excellent sealing performance, avoiding seal failure caused by material cooling and solidification.

[0060] Protecting critical equipment components: Effective sealing can prevent materials from leaking into the equipment, avoiding corrosion and contamination of critical components such as pump shafts and bearings, thereby extending the service life of these components, reducing equipment maintenance costs, and improving the overall reliability and stability of the equipment.

[0061] Ensuring food safety: Since there is no need to set up a flushing hole to soften materials with high-temperature cleaning water as in traditional mechanical seals, it avoids the microbial contamination that may be introduced by residual cleaning water, meets the strict hygiene and safety requirements of the food processing industry, and helps to ensure food quality and safety.

[0062] For example, such as Figure 1 As shown, a lubrication groove 14 is provided between adjacent sealing grooves 12, and the lubrication groove 14 is filled with lubricating oil (food-grade lubricating oil), which has the following beneficial effects:

[0063] Reduced friction: During the rotation of the bushing 2, the lubricating oil can reduce the coefficient of friction between the lip seal 13 and the bushing 2, as well as between the O-ring and related components, thereby reducing wear and further extending the service life of the sealing assembly.

[0064] Auxiliary sealing: Lubricating oil can fill the tiny gaps that may exist between sealing components, playing a certain auxiliary sealing role, enhancing the sealing effect, and helping to prevent material leakage.

[0065] Heat dissipation function: It can remove the heat generated by friction during the operation of the sealing components, prevent the sealing components from degrading or being damaged due to overheating, and improve the stability and reliability of the sealing components.

[0066] Buffering and shock absorption: It plays a certain role in buffering the vibration and impact generated by the sealing components during operation, making the sealing structure more stable and reducing the risk of seal failure caused by vibration.

[0067] For example, such as Figure 1 As shown, the assembly platform 11 and the end of the sealing cavity 1 form a positioning stop 15. During the installation of the sealing assembly, the positioning stop 15 can cooperate with the corresponding structure of the pump body to ensure that the sealing cavity 1 is accurately installed in the predetermined position. The presence of the positioning stop 15 increases the contact area and connection strength between the sealing cavity 1 and the pump body, making the sealing cavity 1 more stable during operation, reducing displacement or shaking caused by external forces such as vibration and impact, helping to maintain the stability of the sealing structure, and improving the reliability and service life of the sealing assembly. It also simplifies the installation process: the positioning stop 15 provides a clear positioning reference for the installation of the sealing cavity 1, making the installation process simpler and faster, reducing installation difficulty, improving installation efficiency, and also reducing the risk of seal failure due to installation errors.

[0068] For example, such as Figure 1As shown, the other end of the bushing 2 has a retaining part 23. During the installation of the sealing assembly, the retaining part 23 can cooperate with the corresponding structure of the pump vehicle to ensure that the bushing is installed in the designated position on the pump shaft. During installation, the retaining part 23 can serve as a positioning reference, helping to quickly and accurately install the bushing 2 and ensuring its relative positional accuracy with the sealing cavity 1, pump shaft, and other components; it restricts the axial movement of the bushing 2, ensuring that the bushing remains in the correct position during operation, guaranteeing the stability and reliability of the sealing structure; this avoids deviations in the fit between the lip seal 13, O-ring, and other sealing components and the bushing or pump shaft due to axial movement of the bushing, thereby preventing material leakage; this helps improve installation efficiency, reduce installation errors, and allows the sealing assembly to better perform its sealing function; when the pump is working, axial forces may be generated, and the retaining part 23 can withstand a certain amount of axial force, transferring it to other components, reducing the axial load on the bushing 2 and sealing components, protecting the sealing structure from excessive axial forces, and extending the service life of the sealing assembly and bushing.

[0069] For example, such as Figure 1 As shown, a round flat gasket 3 is provided at the end of the sealing cavity 1 away from the set screw hole 21. The round flat gasket can be used to adjust the gap between the sealing cavity and other components, compensate for possible dimensional errors, ensure the fitting accuracy between the sealing cavity and components such as the bushing and pump shaft, so that sealing components such as lip seals and O-rings can better perform their sealing function and prevent sealing failure caused by excessive or insufficient gaps; during equipment operation, it can play a buffering and shock-absorbing role, reduce wear and loosening between the sealing cavity and adjacent components caused by vibration and impact, help protect the stability of the sealing structure, and extend the service life of the sealing components; make the pressure on the sealing cavity more evenly distributed on the connection surface, avoid excessive local wear or deformation of the sealing components due to pressure concentration, thereby improving the sealing effect and the reliability of the sealing components; protect the surface of the sealing cavity: isolate the sealing cavity from direct contact with other components, prevent scratches, wear and other damage to the surface of the sealing cavity during installation or operation, maintain the surface quality of the sealing cavity, and ensure that the sealing performance is not affected.

[0070] like Figure 1-3 A rotary pump sealing assembly is shown, wherein the sealing assembly with a lip seal is assembled to the rotary pump, wherein the sealing cavity 1 is screwed to the pump body of the rotary pump through the pump position screw hole 16, and the bushing 2 is screwed to the pump shaft of the rotary pump through the set screw hole 21.

[0071] This rotor pump sealing assembly overcomes the problems of spring failure and leakage when conveying high-viscosity materials in traditional mechanical seals. It also eliminates the need for high-temperature water rinsing, avoiding the risk of microbial contamination introduced by residual cleaning water, ensuring food safety, providing efficient sealing, extending the service life of the sealing assembly, facilitating assembly, and ensuring stable operation.

[0072] like Figure 1-3 A lip seal assembly is shown for a cam pump, wherein the sealing cavity 1 is screwed to the pump body of the cam pump through the pump position screw hole 16, and the bushing 2 is screwed to the pump shaft of the cam pump through the set screw hole 21.

[0073] This cam pump sealing assembly overcomes the problems of spring failure and leakage when conveying high-viscosity materials in traditional mechanical seals. It also eliminates the need for high-temperature water rinsing, avoiding the risk of microbial contamination introduced by residual cleaning water, ensuring food safety, providing efficient sealing, extending the service life of the sealing assembly, facilitating assembly, and ensuring stable operation.

[0074] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A sealing assembly with lip seal, comprising a sealing cavity (1) and a bushing (2) matched with the sealing cavity (1), characterized in that, the sealing cavity (1) is provided with an assembly platform (11) on the upper and lower sides of the sealing cavity (1), and the assembly platform (11) is provided with a pump position screw hole (16); the inner wall of the sealing cavity (1) is provided with two or more than two Stellite sealing grooves (12), and the Stellite sealing groove (12) is provided with a lip seal ring (13) and an O-ring for radial compensation of the lip seal ring (13); the bushing (2) is provided with three or more than three circumferentially arranged tight screw holes (21) at one end of the bushing (2); and the inner wall of the bushing (2) is provided with two or more than two bushing sealing grooves (22), and the bushing sealing groove (22) is provided with an O-ring.

2. The seal assembly having a lip seal of claim 1, wherein, The lip seal ring (13) is a PTFE ring.

3. The seal assembly having a lip seal of claim 2, wherein, The PTFE ring is a sealing ring synthesized by carbon fiber material.

4. The seal assembly having a lip seal of claim 1 wherein, After the sealing cavity (1) is assembled on the pump body through the pump position screw hole (16) and the bushing (2) is assembled on the pump shaft through the tight screw hole (21), the lip seal ring (13) forms a sealing structure with the bushing (2), and the O-ring of the bushing sealing groove (22) forms a sealing structure with the pump shaft.

5. The seal assembly having a lip seal of claim 1 wherein, Adjacent Stellite sealing grooves (12) are provided with a lubricating groove (14), and the lubricating groove (14) is provided with lubricating oil.

6. The seal assembly having a lip seal of claim 1 wherein, The assembly platform (11) and the end of the sealing cavity (1) form a positioning stop (15).

7. The seal assembly having a lip seal of claim 1 wherein, The other end of the bushing (2) has a stop portion (23).

8. The seal assembly having a lip seal of claim 1 wherein, The end of the sealing cavity (1) away from the tight screw hole (21) is provided with a round flat gasket (3).

9. A rotor pump seal assembly characterized by, The sealing assembly with lip seal according to any one of claims 1-8 is assembled on a rotor pump, wherein the sealing cavity (1) is screw-assembled on the pump body of the rotor pump through the pump position screw hole (16), and the bushing (2) is tight screw-assembled on the pump shaft of the rotor pump through the tight screw hole (21).

10. A lobe pump seal assembly characterized by, The sealing assembly with lip seal according to any one of claims 1-8 is assembled on a cam pump, wherein the sealing cavity (1) is screw-assembled on the pump body of the cam pump through the pump position screw hole (16), and the bushing (2) is tight screw-assembled on the pump shaft of the cam pump through the tight screw hole (21).

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