High-temperature sealing device for solar heating conduction oil

Abstract

The high-temperature sealing device comprises a shell and a shaft sleeve, the shaft sleeve is rotationally installed in the shell, and a rotating shaft is fixedly installed in the shaft sleeve; a mounting ring is arranged in the shell, a static ring sleeves the mounting ring, an anti-rotation mechanism is arranged between the mounting ring and the static ring, a graphite pad matched with the rotating shaft is arranged at one end of the shaft sleeve, a mounting seat is arranged at the other end of the shaft sleeve, and a moving ring is fixedly mounted on the mounting seat; the moving ring is rotationally matched with the static ring to form mechanical seal; a first sealing ring is arranged between the installation base and the movable ring, and a soft spring is installed on the first sealing ring. The static ring has the beneficial effects that the stability of the static ring can be improved through the anti-rotation mechanism, and the position deviation of the static ring is avoided; after the shaft sleeve is inserted into the rotating shaft, the four sides of the graphite pad are pressed by the rotating shaft, so that the rotating shaft is prevented from slipping; the soft spring can ensure that the movable ring keeps centering in the radial direction through elastic force; the utility model is suitable for high-temperature environment, and has the advantages of good sealing performance, strong loading capacity and the like.

Description

Technical Field

[0001] This application relates to the field of mechanical seal technology, and in particular to a high-temperature sealing device for solar heating heat transfer oil. Background Technology

[0002] A solar-powered thermal oil pump is a device that uses solar energy for heating. Its working principle involves converting solar energy into thermal oil energy, which is then transferred to the heating system for heating. During heat transfer, the pump body needs to be sealed. Current technologies mostly use mechanical seals, but due to the high operating temperatures of solar-powered thermal oil pumps, conventional mechanical seals suffer from drawbacks such as short lifespan and poor stability at high temperatures.

[0003] Currently, mechanical seals typically employ a dynamic sealing method using a rotating ring and a stationary ring. A shaft drives the rotating ring to rotate synchronously, causing relative rotation between the rotating and stationary rings, forming a sealing surface on their mating surfaces. However, the high temperature and pressure inside solar thermal oil pumps can cause the internal sealing structure to shift over long-term operation, thus affecting the sealing performance. Therefore, there is an urgent need for a sealing device capable of withstanding high-temperature and high-pressure environments. Utility Model Content

[0004] One objective of this application is to provide a high-temperature sealing device for solar-heated heat transfer oil that can solve at least one of the defects in the above-mentioned background art.

[0005] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a high-temperature sealing device for solar heating heat transfer oil, comprising a housing and a bushing, wherein the bushing is rotatably mounted on the housing, and a rotating shaft is fixedly mounted inside the bushing; an installation ring is provided inside the housing, a stationary ring is sleeved on the installation ring, an anti-rotation mechanism is provided between the installation ring and the stationary ring, a graphite gasket that mates with the rotating shaft is provided at one end of the bushing, and an installation seat is provided at the other end, a rotating ring is fixedly mounted on the installation seat; the rotating ring forms a mechanical seal by rotating and engaging with the stationary ring; a first sealing ring is provided between the installation seat and the rotating ring, and a soft spring is installed on the first sealing ring.

[0006] With the above settings, the rotating ring can rotate synchronously with the shaft, causing relative rotation between the rotating and stationary rings to ensure the formation of a mechanical seal structure on the mating surfaces of the rotating and stationary rings. The anti-rotation mechanism further improves the installation stability of the stationary ring, preventing positional displacement. When the bushing is inserted into the shaft, the graphite gasket is subjected to pressure from the shaft on all four sides, ensuring that the shaft and bushing are aligned and improving the operational stability of the oil pump. In addition, the graphite gasket also increases the friction between the shaft and bushing, preventing shaft slippage. The soft spring ensures that the rotating ring remains radially aligned, improving the pressure resistance and vibration resistance of the first sealing ring.

[0007] Preferably, a second sealing ring is installed between the bottom of the rotating ring and the mounting base; the first sealing ring is sleeved on the side of the rotating ring. This arrangement allows the second sealing ring, in conjunction with the first sealing ring, to simultaneously seal the bottom and side of the rotating ring. Since the second sealing ring is installed at the bottom of the rotating ring, greater pressure can be applied to it during installation, further increasing its compression and ensuring uniform pressure distribution, thus improving its sealing performance.

[0008] Preferably, a pressure ring is connected to the mounting base, and a mating thread structure is provided between the pressure ring and the mounting base. The pressure ring and the rotating ring have overlapping surfaces. This configuration allows the rotating ring to be axially limited by the pressure ring, preventing it from shaking during long-term operation. Simultaneously, the pressure ring can also compress the rotating ring tightly against the second sealing ring, and the thread structure further improves the installation efficiency of the pressure ring.

[0009] Preferably, the stationary ring is slidably mounted on the mounting ring, and a sliding sealing mechanism is provided between the stationary ring and the mounting ring. With this configuration, the stationary ring can be sealed to the mounting ring via the sliding sealing mechanism. When it is necessary to change the gap between the moving ring and the stationary ring, simply release the limiting effect of the stationary ring and then move the stationary ring.

[0010] Preferably, the sliding sealing mechanism includes a sealing ring, and the mounting ring is provided with a sprayed surface for sliding sealing in conjunction with the sealing ring. This configuration ensures that the sealing effect remains unchanged when the stationary ring moves, and the smooth surface of the sprayed surface effectively protects the surface of the mounting ring, reduces friction between the sealing ring and the mounting ring, and improves the service life of the sealing ring.

[0011] Preferably, a step is provided on the stationary ring near the sealing ring, and the step is close to the sprayed surface. This arrangement reduces the gap between the stationary ring and the mounting ring, preventing excessive pressure at the mechanical seal from squeezing out the sealing ring.

[0012] Preferably, the anti-rotation mechanism includes an anti-rotation plate, which is detachably mounted on the mounting ring and is used to limit the stationary ring. This configuration allows the stationary ring to be radially limited by the anti-rotation plate, ensuring that the stationary ring remains stationary at all times, thereby improving the stability of the mechanical seal. Furthermore, the independent design of the anti-rotation plate facilitates maintenance and replacement.

[0013] Preferably, a base is installed at the bottom of the housing, and a toothed throttling ring is provided on the inner diameter of the base. A bellows is provided inside the housing, and a fork structure is provided between multiple annular surfaces of the bellows. This arrangement allows the throttling ring to act as a heat insulator, preventing high temperatures at the mechanical seal and thus reducing sealing performance. The bellows can absorb axial displacement of the sealing surface through its elastic deformation, ensuring the sealing surface remains in contact and preventing media leakage. The fork structure allows control of the annular surfaces of the metal bellows during machine startup, effectively reducing the impact of frequent starts and stops on the bellows. Furthermore, the fork has a large transmission force, solving the problems of annular surface engagement and insufficient starting torque caused by prolonged downtime.

[0014] Preferably, the outer shell is fitted with a protective shell, and the outer wall of the outer shell is provided with double stops; the outer shell is provided with a flange end face that mates with the protective shell, and the flange end face is provided with a groove. This configuration improves the alignment between the protective shell and the outer shell through the double stops. The double stops use metal spiral wound gaskets, and when the outer shell and the protective shell are installed, the double stops provide connection and restraint, preventing misalignment of the outer shell, reducing external impact forces, and improving the overall high-temperature resistance.

[0015] Preferably, a positioning sleeve is fixedly installed on one end of the bushing that extends out of the housing, and an anti-slip structure is provided between the positioning sleeve and the bushing. This arrangement allows the positioning sleeve to limit the position of the bushing, ensuring that the bushing can be fixedly installed on the rotating shaft; the anti-slip structure further improves the installation stability of the bushing and prevents slippage between the bushing and the positioning sleeve.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] The rotating ring can rotate synchronously with the shaft, causing relative rotation between the rotating and stationary rings, and forming a mechanical seal structure on the mating surfaces of the rotating and stationary rings. The anti-rotation mechanism further improves the installation stability of the stationary ring and prevents it from shifting position. When the bushing is inserted into the shaft, the graphite gasket is subjected to pressure from the shaft on all four sides, ensuring that the shaft and bushing are aligned. This improves the operating stability of the oil pump and increases the friction between the shaft and bushing, preventing the shaft from slipping.

[0018] The soft spring on the first sealing ring ensures the rotating ring remains radially aligned through its elastic force. When machine vibration occurs, the spring force counteracts the impact force on the rotating ring, preventing it from colliding and thus improving the compression and vibration resistance of the first sealing ring. The second sealing ring is located at the bottom of the rotating ring. During installation, greater pressure can be applied to the second sealing ring, resulting in greater compression and ensuring uniform pressure distribution, thereby improving its sealing performance. This invention offers advantages such as good sealing performance and strong pressure resistance. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the sealing device in this application.

[0020] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0021] Figure 3 for Figure 1 A magnified structural diagram of part B in the middle section.

[0022] Figure 4 This is a top view of the sealing device in this application.

[0023] In the diagram: 1. Housing; 11. Mounting ring; 12. Double stop; 13. Groove; 14. Flushing port; 100. First sealing ring; 110. Sprayed surface; 2. Bushing; 21. Mounting base; 22. Graphite pad; 200. Second sealing ring; 210. Pressure ring; 3. Stationary ring; 31. Step; 300. Sealing ring; 4. Rotary ring; 400. Anti-rotation plate; 5. Protective shell; 500. Base; 501. Throttling ring; 6. Positioning sleeve; 600. Bellows. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] One aspect of this application provides a high-temperature sealing device for solar-heated heat transfer oil, wherein a preferred embodiment is, for example... Figure 1 As shown, the device includes a housing 1 and a bushing 2. The bushing 2 is rotatably mounted inside the housing 1, and a rotating shaft (not shown) is fixedly mounted inside the bushing 2. The rotating shaft can drive the bushing 2 to rotate relative to the housing 1. A mounting ring 11 is provided inside the housing 1, and a stationary ring 3 is fitted onto the mounting ring 11. An anti-rotation mechanism is provided between the mounting ring 11 and the stationary ring 3 to further improve the installation stability of the stationary ring 3 and prevent its position from shifting. One end of the bushing 2 is provided with a graphite pad 22 that mates with the rotating shaft, and the other end is provided with a mounting base 21. A rotating ring 4 is fixedly mounted on the mounting base 21 so that the rotating ring 4 can rotate synchronously with the rotating shaft. When the rotating shaft rotates, the rotating ring 4 can cooperate with the stationary ring 3 to form a mechanical seal structure. When the medium reaches the mechanical seal, the medium forms a liquid film on the mating surface of the rotating ring 4 and the stationary ring 3, which not only reduces friction but also prevents medium leakage.

[0029] Understandably, when the bushing 2 is inserted into the shaft, the graphite pad 22 will be subjected to pressure from the shaft on all four sides, which can ensure that the shaft and bushing 2 are aligned and improve the operating stability of the oil pump. In addition, the graphite pad 22 can also increase the friction between the shaft and bushing 2 and prevent the shaft from slipping.

[0030] In addition, to further improve the sealing effect of the sealing device, there are two stationary rings 3 and two rotating rings 4. The two rotating rings 4 are installed on both sides of the mounting base 21, and the two rotating rings 4 cooperate with their respective stationary rings 3 to form a mechanical seal.

[0031] Furthermore, such as Figure 2 As shown, a first sealing ring 100 is provided between the mounting base 21 and the moving ring 4. A soft spring (not shown in the figure) is installed on the first sealing ring 100. The soft spring can ensure that the moving ring 4 is radially aligned through its elastic force. When the moving ring 4 vibrates, the soft spring can absorb the kinetic energy, thereby improving the compressive strength and vibration resistance of the first sealing ring 100.

[0032] Specifically, such as Figure 2 As shown, a second sealing ring 200 is also installed between the bottom of the rotating ring 4 and the mounting base 21. The first sealing ring 100 is sleeved on the side of the rotating ring 4. The second sealing ring 200 can work with the first sealing ring 100 to seal the bottom and side of the rotating ring 4 at the same time, further improving the sealing performance of the rotating ring 4 and ensuring that it still has a good sealing effect under high temperature conditions.

[0033] It should be noted that by placing the second sealing ring 200 at the bottom of the moving ring 4, greater pressure can be applied to the second sealing ring 200 during installation of the moving ring 4, further increasing the compression of the second sealing ring 200 and ensuring that the second sealing ring 200 is evenly compressed, thereby improving its sealing effect. The first sealing ring 100 and the second sealing ring 200 are preferably made of flexible graphite, which is heat-resistant and will not lose its function due to high temperatures.

[0034] In this embodiment, as Figure 1 and Figure 2 As shown, to further improve the installation stability of the rotating ring 4, a detachable pressure ring 210 is installed on the mounting base 21. A mating thread structure is provided between the pressure ring 210 and the mounting base 21, and the inner diameter of the pressure ring 210 is smaller than the diameter of the rotating ring 4 to ensure that the pressure ring 210 overlaps with the rotating ring 4 after installation. The pressure ring 210 can axially limit the rotating ring 4, preventing it from shaking during long-term operation. Simultaneously, the pressure ring 210 can also compress the rotating ring 4 tightly against the second sealing ring 200, ensuring a greater compression of the second sealing ring 200. The threaded structure further improves the installation efficiency of the pressure ring 210.

[0035] Furthermore, the stationary ring 3 is slidably mounted on the mounting ring 11, and a sliding sealing mechanism is provided between the stationary ring 3 and the mounting ring 11 to ensure that the stationary ring 3 maintains its airtightness when it moves, thus preventing a decrease in its effectiveness. When the position of the stationary ring 3 needs to be adjusted, simply release the limiting effect of the stationary ring 3, then adjust its position according to the actual needs. When the stationary ring 3 is in the appropriate position, it can be limited again, thereby improving the applicability of this device.

[0036] Specifically, such as Figure 3 As shown, the sliding sealing mechanism includes a sealing ring 300. The mounting ring 11 is provided with a sprayed surface 110 for sliding sealing with the sealing ring 300, so as to ensure that the sealing ring 300 still has a good sealing effect when the stationary ring 3 moves. In addition, the surface of the sprayed surface 110 is polished, which can effectively protect the surface of the mounting ring 11, reduce the friction between the sealing ring 300 and the mounting ring 11, and improve the service life of the sealing ring 300.

[0037] As a supplement, such as Figure 3 As shown, a step 31 is provided on the side of the stationary ring 3 near the sealing ring 300, and the protruding part of the step 31 is close to the spraying surface 110 to block the sealing ring 300. The step 31 can reduce the gap between the stationary ring 3 and the mounting ring 11, and prevent the sealing ring 300 from being squeezed out by excessive pressure at the mechanical seal.

[0038] In this embodiment, as Figure 1 and Figure 3 As shown, the anti-rotation mechanism includes an anti-rotation plate 400, which is detachably mounted on the side of the mounting ring 11. When the anti-rotation plate 400 is fixedly mounted on the mounting ring 11, it cooperates with the mounting ring 11 to compress the stationary ring 3 and radially limit its movement, ensuring that the stationary ring 3 remains stationary, further improving the stability of the mechanical seal. The anti-rotation plate 400 can be designed independently for easier maintenance and replacement later.

[0039] It should be noted that this sealing device is suitable for solar thermal oil pumps, where the internal medium is thermal oil. When the solar thermal oil pump is running, the internal temperature can reach 300℃. Ordinary mechanical seal structures are prone to seal failure under high temperatures. The mechanical seal structure in this application is equipped with multiple sealing structures, has high atmospheric pressure resistance, and also features a limiting structure to ensure the installation stability of the dynamic ring 4 and the stationary ring 3, making it more suitable for thermal oil pumps containing high-temperature media.

[0040] In this embodiment, as Figure 1 As shown, a base 500 is installed at the bottom of the housing 1. A toothed throttling ring 501 is provided on the inner diameter of the base 500. The throttling ring 501 serves as heat insulation, preventing the high-temperature medium from conducting excessive heat to the mechanical seal and reducing its sealing performance. In addition, a bellows 600 connected to the stationary ring 3 is also installed inside the housing 1. The bellows 600 can absorb axial displacement of the sealing surface through its elastic deformation, ensuring that the sealing surface remains in contact and preventing medium leakage.

[0041] Furthermore, a shift fork structure is provided between the multiple annular surfaces of the bellows 600. The shift forks can control the annular surfaces of the metal bellows 600 during machine startup, effectively reducing the impact of frequent start-stop cycles on the bellows 600. The shift forks also have a large transmission force, solving the problems of annular surface engagement and insufficient starting torque caused by prolonged downtime. The specific shape and specifications of the shift forks are existing technology and will not be elaborated upon here.

[0042] In this embodiment, as Figure 1As shown, a protective shell 5 is fitted over the outer shell 1. The outer wall of the shell 1 is provided with double stops 12. The double stops 12 improve the alignment between the protective shell 5 and the shell 1. The double stops 12 are made of metal spiral wound gaskets. When the shell 1 and the protective shell 5 are installed, they can be connected and limited through the double stops 12, which can prevent the shell 1 from being misaligned, reduce external impact force, and improve the overall high temperature resistance.

[0043] Specifically, such as Figure 1 As shown, the housing 1 is also provided with a flange end face that mates with the protective shell 5. A groove 13 is provided on the flange end face. When the housing 1 contacts the protective shell 5, the groove 13 can reduce the contact area between the flange end face and the protective shell 5, ensuring the overall flatness and preventing tilting between the housing 1 and the protective shell 5. The housing 1 is provided with a flushing port 14 that communicates with the interior. When the temperature inside the housing 1 is high, a medium can be injected into the housing 1 through the flushing port 14 to cool it down.

[0044] Furthermore, such as Figure 1 and Figure 4 As shown, a positioning sleeve 6 is fixedly installed on one end of the bushing 2 that extends out of the housing 1. An anti-slip structure is provided between the positioning sleeve 6 and the bushing 2. The positioning sleeve 6 can limit the position of the bushing 2, ensuring that the bushing 2 can be fixedly installed on the rotating shaft. The anti-slip structure further improves the installation stability of the bushing 2 and prevents the bushing 2 from slipping on the positioning sleeve 6. The positioning sleeve 6 and the bushing 2 use a tangential drive, which has a large transmission torque and is not easy to slip. The anti-slip structure includes, but is not limited to, rubber pads and flexible graphite.

[0045] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A high-temperature sealing device for solar heating of heat conducting oil, comprising a housing (1) and a shaft sleeve (2), the shaft sleeve (2) being rotatably installed on the housing (1), and a rotating shaft being fixedly installed in the shaft sleeve (2); characterized in that, The shell (1) is provided with a mounting ring (11), the mounting ring (11) is sleeved with a static ring (3), a rotation prevention mechanism is arranged between the mounting ring (11) and the static ring (3), one end of the shaft sleeve (2) is provided with a graphite pad (22) matched with the rotating shaft, the other end is provided with a mounting seat (21), the mounting seat (21) is fixedly provided with a dynamic ring (4); the dynamic ring (4) is mechanically sealed by rotating and matching the static ring (3); a first sealing ring (100) is arranged between the mounting seat (21) and the dynamic ring (4), and a soft spring is arranged on the first sealing ring (100).

2. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1, wherein, A second sealing ring (200) is arranged between the bottom of the dynamic ring (4) and the mounting seat (21); the first sealing ring (100) is sleeved on the side of the dynamic ring (4).

3. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 2, wherein, A pressing ring (210) is arranged on the mounting seat (21), a threaded structure matched with each other is arranged between the pressing ring (210) and the mounting seat (21), and the pressing ring (210) has an overlapping surface with the dynamic ring (4).

4. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1, wherein, The static ring (3) is slidingly installed on the mounting ring (11), and a sliding sealing mechanism is arranged between the static ring (3) and the mounting ring (11).

5. A high temperature seal for solar heating of heat transfer oil as claimed in claim 4 wherein, The sliding sealing mechanism comprises a sealing ring (300), and the mounting ring (11) is provided with a sprayed surface (110) for matching the sealing ring (300) to realize sliding sealing.

6. A high temperature sealed device for solar heating of heat transfer oil as claimed in claim 5 wherein, A step (31) is arranged on one side of the static ring (3) close to the sealing ring (300), and the step (31) is close to the sprayed surface (110).

7. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1 wherein, The rotation prevention mechanism comprises an anti-rotation sheet (400), the anti-rotation sheet (400) is detachably installed on the mounting ring (11), and the anti-rotation sheet (400) is used for limiting the static ring (3).

8. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1, wherein, A base (500) is installed at the bottom of the shell (1), the inner diameter of the base (500) is provided with a tooth-shaped throttling ring (501), a bellows (600) is arranged in the shell (1), and a yoke structure is arranged between the multiple annular faces of the bellows (600).

9. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1 wherein, A protective shell (5) is sleeved on the shell (1), the outer wall of the shell (1) is provided with a double stop (12); a flange end face matched with the protective shell (5) is arranged on the shell (1), and a groove (13) is arranged on the flange end face.

10. The high temperature sealed device for solar heating of heat transfer oil as claimed in claim 1 wherein, A positioning sleeve (6) is fixedly installed on one end of the shaft sleeve (2) protruding out of the shell (1), and an anti-skid structure is arranged between the positioning sleeve (6) and the shaft sleeve (2).

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