A double mechanical seal

Abstract

A double end face mechanical seal, including mutually matched bushings, inner flanges, inner static rings, inner dynamic rings, outer dynamic rings, outer static rings, outer flanges, fixed ring assemblies, and the formed internal cavities, further including static flushing adjusting components, the top of the inner flange is provided with a cavity, the static flushing adjusting components are screwed into the top of the inner flange through threaded cooperation, a sealed cavity is formed with the internal cavities, cooling water is filled in the sealed cavity, medium crystallization is well prevented, heat of rotating sealing pairs is absorbed, a power circulation cooling device is not needed, space occupation is small, the static flushing function can be flexibly used in narrow production environment, gas generated by continuous vaporization of cooling water due to heat generated by high-speed operation can be timely discharged, gas aggregation in the mechanical seal is avoided, and normal cooling of the mechanical seal is affected. The utility model is especially suitable for working conditions of strong corrosion, high temperature, suspended particles and fiber medium.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seals and relates to a double-end mechanical seal used in rotating equipment. Background Technology

[0002] Currently, rotating machinery with rotating components typically employs face mechanical seals, which are generally classified as single-face or double-face. A face mechanical seal is a shaft sealing device used in rotating machinery, which includes various equipment such as centrifugal pumps, centrifuges, and compressors.

[0003] The sealing principle of double-end mechanical seals is basically the same as that of single-end mechanical seals. Both rely on the end faces (friction pairs) perpendicular to the axis of rotation to maintain contact and relative sliding under the action of fluid pressure, the elastic force of the compensation mechanism, and the cooperation of auxiliary coolant, thus forming a device to prevent fluid leakage. Double-end mechanical seals have two end face seals. If the primary seal fails, the secondary seal can still seal and prevent leakage.

[0004] Double-end mechanical seals generally require a flushing and cooling auxiliary system, which involves introducing flushing coolant into the sealing cavity between the two end faces to improve the lubrication and cooling conditions of the mechanical seal. There are generally two types: self-circulating systems and constant-flow systems, which introduce flushing coolant into the sealing cavity for lubrication and cooling. Both types of externally supplied coolant systems have significant drawbacks: self-circulating systems include storage tanks, pipelines, filtration devices, and power systems, often occupying a large space and incurring high costs. Constant-flow sealing fluid systems typically use water as the flushing coolant, which flows through the sealing cavity and is then discharged into a drain. After equipment shutdown, the cooling water pipeline cannot automatically shut off, resulting in resource waste. Utility Model Content

[0005] The purpose of this invention is to provide a novel static flushing double-end mechanical seal that overcomes the shortcomings of existing double-end mechanical seals in external coolant supply systems using the two forms mentioned above.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A double-end mechanical seal includes a bushing, an inner flange, an inner stationary ring, an inner dynamic ring, an outer dynamic ring, an outer stationary ring, an outer flange, a fixed ring assembly that cooperate with each other, and an internal cavity formed therein. It also includes a static flushing adjustment component. The top of the inner flange has a cavity. The static flushing adjustment component is screwed into the top of the inner flange by a threaded engagement to form a sealing cavity with the internal cavity, which is filled with cooling water.

[0008] Further, optionally, the inner sealing ring of the bushing is radially disposed within the bushing to form a sealing structure between the bushing and the shaft; and / or, optionally, the inner moving ring is sleeved on the bushing from the inside, and the inner moving ring sealing ring is radially disposed within the inner moving ring to form a sealing structure between the inner moving ring and the bushing; and / or, optionally, the inner stationary ring is sleeved on the inner moving ring, the inner flange is sleeved on the inner stationary ring from the inside, and the inner stationary ring sealing ring is radially disposed within the inner flange to form a sealing structure between the inner stationary ring and the inner flange.

[0009] Optionally, the outer moving ring is sleeved on the bushing from the outside, and the outer moving ring sealing ring is radially disposed inside the outer moving ring to form a sealing structure between the outer moving ring and the bushing; and / or, optionally, the outer stationary ring is sleeved on the outer moving ring; the outer flange is sleeved on the outer stationary ring from the outside, and the outer stationary ring sealing ring is radially disposed inside the outer flange to form a sealing structure between the outer stationary ring and the outer flange.

[0010] Optionally, the retaining ring is fitted onto the outer flange, the positioning block is fitted onto the retaining ring, and / or, optionally, the socket head cap screw and socket head cap screw radially fix the positioning block and retaining ring onto the bushing.

[0011] Optionally, the inner flange and the outer flange are combined to form a mechanical seal cavity, and the inner and outer snap rings are embedded in the snap grooves of the spring seat, providing outward support and playing a radial positioning role.

[0012] Optionally, a cylindrical helical compression spring passes through the spring hole of the spring seat to compensate for the axial displacement of the inner and outer moving rings; inner and outer push rings are located between the cylindrical helical compression spring and the outer moving ring.

[0013] Optionally, the cavity at the top of the inner flange is a stepped-hole type cavity.

[0014] Optionally, the static flushing adjustment component is screwed into the top of the inner flange via a threaded connection.

[0015] Optionally, the static flushing adjustment component includes a valve body, float, cap nut, traction rod, traction seat, O-ring, valve cover, medium channel pipe, nozzle, nozzle seal, and vent cap that are interconnected and cooperate with each other.

[0016] Optionally, the valve body is a tubular cavity structure with an external thread at its bottom, which is matched with the internal thread arranged in the cavity at the top of the internal flange; and / or, optionally, the floating body is a section of cylinder, which is obliquely placed inside the valve body to partially block the channel leading to the cavity at the top of the internal flange; and / or, optionally, a rectangular plate is erected at the diameter position on the top surface circle of the floating body, and a small hole is provided at the center of the rectangular plate; and / or, optionally, the O-ring is installed in the valve cover, the medium channel pipe is fixed to the valve cover, and the nozzle is connected to the traction rod through the medium channel pipe by the union nut; and / or, optionally, the nozzle is hermetically installed on the nozzle to achieve the sealing of the medium channel pipe and the vent cap.

[0017] By installing a static flushing adjustment component at the top of the double-ended mechanical seal, the external flushing liquid cooling circulation system supporting the traditional double-ended mechanical seal is replaced. A sealing cavity is formed between the static flushing adjustment component at the top of the mechanical seal and the mechanical seal end face, and the sealing cooling water always fills the cavity. In the non-operating state, due to the presence of the cooling water, the possibility of medium crystallization is reduced. In the operating state, due to the heat generated by the high-speed rotation of the mechanical seal, the excess gas generated by the continuous vaporization of the cooling water can be discharged in time through the static flushing adjustment component自带 by the mechanical seal, and a constant pressure is maintained in the cooling water cavity, and fresh liquid coolant is always maintained, thus ensuring the normal working state and service life of the mechanical seal.

[0018] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0019] The novel static flushing double-ended mechanical seal of the utility model can eliminate the external coolant supply system of the double-ended mechanical seal, avoiding the disadvantages brought by the adoption of the external coolant system, that is, effectively solving the disadvantages such as the large space occupied by the traditional double-ended mechanical seal complete set device and the waste of resources caused by the constant flow of the flushing coolant.

[0020] After adopting the static flushing adjustment component of the utility model, the sealing cooling water fills between the mechanical seal end faces. In the non-operating state, the possibility of medium crystallization is reduced. In the operating state, due to the heat generated by the high-speed rotation of the mechanical seal, the excess gas generated by the continuous vaporization of the cooling water can be discharged in time through the static flushing adjustment component自带 by the mechanical seal, and fresh liquid coolant is maintained between the mechanical seal end faces, ensuring the normal working state and service life of the mechanical seal.

[0021] Compared to traditional coolant power circulation devices, this new mechanical seal device significantly reduces space and cost, while also avoiding resource waste caused by constant coolant flow. Furthermore, this invention improves the reliability of the centrifugal pump's mechanical seal, extending equipment lifespan. This invention is particularly suitable for operating conditions involving highly corrosive, high-temperature, or media containing suspended particles and fibers. Applying this invention facilitates stable production operation and supports cost reduction and efficiency improvement for enterprises.

[0022] The installation of this novel static flushing double-end mechanical seal is no different from that of a conventional double-end mechanical seal. After assembly, first loosen the vent cap of the static flushing adjustment component to expel excess gas from the adjustment component cavity and test whether the exhaust pipe is unobstructed. After this operation, reset the vent cap and loosen it slightly to ensure that the gas accumulated in the cavity can be discharged. Attached Figure Description

[0023] Figure 1 Cross-sectional view of the overall structure of the static flushing double-end mechanical seal embodiment of this utility model.

[0024] Figure 2A for Figure 1 The double-end cross-sectional structure of the embodiment shown Figure 1 .

[0025] Figure 2B for Figure 1 The embodiment shown is illustrated in Figure 2, which shows a cross-sectional structure with two ends.

[0026] Figure 2C for Figure 1 Figure 3 shows the cross-sectional structure of the double-end face of the embodiment shown.

[0027] Figure 3A for Figure 1 The inner flange cross-sectional structure of the embodiment shown Figure 1 .

[0028] Figure 3B for Figure 1 The second cross-sectional view of the inner flange in the embodiment shown is illustrated.

[0029] Figure 4A for Figure 1 The inner and outer static ring cross-sectional structure of the embodiment shown Figure 1 .

[0030] Figure 4B for Figure 1 The second diagram shows the cross-sectional structure of the inner and outer stationary rings in the embodiment shown.

[0031] Figure 5A for Figure 1 The internal and external dynamic ring cross-sectional structure of the embodiment shown Figure 1 .

[0032] Figure 5B for Figure 1 The cross-sectional structural diagram of the inner and outer moving rings in the embodiment shown is shown in Figure 2.

[0033] Figure 6A for Figure 1 A cross-sectional view of the static flushing adjustment component in the embodiment shown.

[0034] Figure 6B for Figure 1 A schematic diagram of the static flushing adjustment component in the illustrated embodiment.

[0035] Figure 6C for Figure 1 An exploded view of the static flushing adjustment component in the illustrated embodiment.

[0036] in, Figure 1 Middle Marker:

[0037]

[0038] Figure 6C Middle Marker:

[0039] Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Please see Figure 1 The present invention relates to a double-end mechanical seal comprising a bushing 1, an inner bushing sealing ring 2, an inner flange 3, an inner stationary ring sealing ring 4, an inner stationary ring 5, an inner moving ring 6, an inner moving ring sealing ring 7, an internal hexagonal head set screw 8, an outer moving ring 9, an outer stationary ring 10, an outer flange 11, a fixing ring 12, an internal hexagonal head set screw 13, a positioning block 14, an internal hexagonal head screw 15, an outer stationary ring sealing ring 16, inner and outer snap rings 17, an outer moving ring sealing ring 18, a cylindrical helical compression spring 19, a spring seat 20, a gasket 21, a flange gasket 22, inner and outer push rings 23, and a static flushing adjustment component 24.

[0042] The inner sealing ring 2 of the bushing is radially disposed inside the bushing 1 to form a sealing structure between the bushing 1 and the shaft; the inner moving ring 6 is sleeved on the bushing 1 from the inside, and the inner moving ring sealing ring 7 is radially disposed inside the inner moving ring 6 to form a sealing structure between the inner moving ring 6 and the bushing 1; the inner stationary ring 5 is sleeved on the inner moving ring 6, the inner flange 3 is sleeved on the inner stationary ring 5 from the inside, and the inner stationary ring sealing ring 4 is radially disposed inside the inner flange 3 to form a sealing structure between the inner stationary ring 5 and the inner flange 3; and the hexagonal flat-end set screw 8 fixes the spring seat 20.

[0043] The outer moving ring 9 is sleeved on the bushing 1 from the outside, and the outer moving ring sealing ring 18 is radially disposed inside the outer moving ring 9 to form a sealing structure between the outer moving ring 9 and the bushing 1; the outer stationary ring 10 is sleeved on the outer moving ring 9; the outer flange 11 is sleeved on the outer stationary ring 10 from the outside, and the outer stationary ring sealing ring 16 is radially disposed inside the outer flange 11 to form a sealing structure between the outer stationary ring 10 and the outer flange 11.

[0044] The retaining ring 12 is fitted onto the outer flange 11, the positioning block 14 is fitted onto the retaining ring 12, and the socket head cap screw 13 and socket head cap screw 15 radially fix the positioning block 14 and the retaining ring 12 onto the bushing 1.

[0045] The inner flange 3 and the outer flange 11 combine to form the cavity of the mechanical seal. Inner and outer retaining rings 17 are embedded in the retaining grooves of the spring seat 20, providing outward support and radial positioning. A cylindrical helical compression spring 19 passes through the spring hole of the spring seat 20 to compensate for the axial displacement of the inner and outer moving rings. Inner and outer push rings 23 are located between the cylindrical helical compression spring 19 and the outer moving ring 9, serving to provide axial positioning and wear protection for the moving ring.

[0046] A cavity, such as a stepped hole type, is provided at the top of the inner flange 3; the static flushing adjustment component 24 is screwed into the top of the inner flange 3 through a threaded fit to form a sealed cavity with the cavity, so that cooling water is always filled in the cavity.

[0047] Please see Figure 6A , 6B 6C, The static flushing adjustment component 24 includes a valve body 101, a float 102, a cap nut 103, a traction rod 104, a traction seat 105, an O-ring 106, a valve cover 107, a medium channel pipe 108, a nozzle 109, a nozzle seal 110, and a vent cap 111, which are interconnected and cooperate to form the whole of the static flushing adjustment component 24.

[0048] Among them, the valve body 101 is a tubular cavity structure with an external thread at the bottom, which can be matched with the internal thread arranged in the cavity at the top of the internal flange 3; the floating body 102 is a section of cylinder, which is placed slightly inclined in the valve body 101 and can partially block the channel leading to the cavity at the top of the internal flange 3; a rectangular plate is erected at the diameter position on the top surface circle of the floating body 102, and a small hole is provided at the center of the rectangular plate. When the buoyancy of the liquid in the valve changes, the traction rod 104 swings up and down with the floating body 102 with the traction seat 105 as the fulcrum; the O-ring 106 is installed in the valve cover 107, the medium channel pipe 108 is fixed on the valve cover 107, and the nozzle 109 is connected to the traction rod 104 by the union nut 103 through the medium channel pipe 108. The nozzle seal 110 is installed on the nozzle 109 to achieve the seal between the medium channel pipe 108 and the vent cap 111. The nozzle 109 swings up and down with the traction rod 104 and moves vertically up and down in the medium channel pipe 108, and through the sealing cooperation between the nozzle 109 and the medium channel pipe 108, the on-off of the medium is realized and discharged through the vent cap 111.

[0049] After the static flushing double-ended mechanical seal of the present utility model is assembled, first, it is necessary to unscrew the vent cap of the static flushing adjustment component to discharge the excess gas in the cavity of the adjustment component and test whether the exhaust pipe is unobstructed. After this operation is completed, reset the vent cap and then unscrew it to an appropriate opening degree to ensure that the gas accumulated in the cavity can be discharged.<000\,0139><000\,0140>The static flushing adjustment component自带的新型静态冲洗双端面机械密封 of the present utility model can effectively solve the disadvantages of the traditional double-ended mechanical seal complete set device occupying a large space and the flushing coolant flowing constantly causing waste of resources. <000\,0141><000\,0142>The static flushing adjustment component designed by the present utility model replaces the flushing liquid cooling circulation system supporting the traditional double-ended mechanical seal. The sealing cooling water fills between the mechanical seal end faces. In the non-operating state, the possibility of medium crystallization is reduced. In the operating state, due to the heat generated by the high-speed rotation of the mechanical seal, the excess gas generated by the continuous vaporization of the cooling water can be discharged in time through the static flushing adjustment component自带的新型静态冲洗双端面机械密封 of the mechanical seal, and fresh liquid coolant is maintained between the mechanical seal end faces, ensuring the normal working state and service life of the mechanical seal. <000\,0143><000\,0144>Compared with the traditional coolant power circulation device, the space of this new type of mechanical seal device is greatly reduced, and at the same time, the waste of resources is also reduced. After being put into operation, the actual effect is good. <000\,0145><000\,0146>The foregoing descriptions and embodiments are provided to enable those skilled in the art to understand and apply this invention. Those skilled in the art will readily make various modifications to these contents and apply the general principles described herein to other embodiments without inventive effort. Therefore, this invention is not limited to the foregoing descriptions and embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this invention without departing from its scope should be within the protection scope of this invention.

Claims

1. A double-end mechanical seal, comprising a bushing, an inner flange, an inner stationary ring, an inner dynamic ring, an outer dynamic ring, an outer stationary ring, an outer flange, a fixed ring assembly, and the internal cavity formed therein, characterized in that: It also includes a static flushing adjustment component. The top of the inner flange has a cavity. The static flushing adjustment component is screwed into the top of the inner flange through a threaded connection to form a sealed cavity with the inner cavity, allowing cooling water to fill the sealed cavity.

2. The double-end mechanical seal according to claim 1, characterized in that: The cavity at the top of the inner flange is a stepped-hole type cavity.

3. The double-end mechanical seal according to claim 1, characterized in that: The static flushing adjustment components include a valve body, float, cap nut, traction rod, traction seat, O-ring, valve cover, medium channel pipe, nozzle, nozzle seal, and vent cap that cooperate with each other.

4. The double-end mechanical seal according to claim 3, characterized in that: The valve body is a tubular cavity structure with an external thread at its bottom that mates with an internal thread in the cavity at the top of the inner flange; and / or, optionally, the float is a cylindrical section that is inclined and partially obstructs the passage to the cavity at the top of the inner flange within the valve body; and / or, optionally, a rectangular plate is vertically positioned at a diameter position on the top surface of the float, with a small hole at its center; and / or, optionally, the O-ring is installed in the valve cover, the medium channel pipe is fixed to the valve cover, and the nozzle is connected to the traction rod via the medium channel pipe and the cap nut; and / or, optionally, the nozzle is sealed and installed on the nozzle to achieve a seal between the medium channel pipe and the vent cap.

5. The double-end mechanical seal according to claim 1, characterized in that: The outer moving ring is sleeved on the shaft sleeve from the outside, and the outer moving ring sealing ring is radially disposed inside the outer moving ring to form a sealing structure between the outer moving ring and the shaft sleeve; and / or, optionally, the outer stationary ring is sleeved on the outer moving ring; the outer flange is sleeved on the outer stationary ring from the outside, and the outer stationary ring sealing ring is radially disposed inside the outer flange to form a sealing structure between the outer stationary ring and the outer flange.

6. The double-end mechanical seal according to claim 1, characterized in that: An inner sealing ring is radially disposed within the bushing to form a sealing structure between the bushing and the shaft; and / or, optionally, the inner moving ring is sleeved on the bushing from the inside, and the inner moving ring sealing ring is radially disposed within the inner moving ring to form a sealing structure between the inner moving ring and the bushing; and / or, optionally, the inner stationary ring is sleeved on the inner moving ring, and the inner flange is sleeved on the inner stationary ring from the inside, and the inner stationary ring sealing ring is radially disposed within the inner flange to form a sealing structure between the inner stationary ring and the inner flange.

7. The double-end mechanical seal according to claim 1, characterized in that: The retaining ring is fitted onto the outer flange, the positioning block is fitted onto the retaining ring, and / or, optionally, the positioning block and retaining ring are radially fixed onto the bushing by a hexagonal flat-end set screw or a hexagonal cylindrical head screw.

8. The double-end mechanical seal according to claim 1, characterized in that: The inner and outer flanges are combined to form a mechanical seal cavity, and the inner and outer snap rings are embedded in the snap grooves of the spring seat, providing outward support and radial positioning.

9. The double-end mechanical seal according to claim 1, characterized in that: A cylindrical helical compression spring passes through the spring hole of the spring seat to compensate for the axial displacement of the inner and outer moving rings; inner and outer push rings are located between the cylindrical helical compression spring and the outer moving ring.

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