A type of containerized mechanical seal

Abstract

This utility model provides a cartridge-type mechanical seal, belonging to the field of mechanical seal technology. It includes: a shaft sleeve with a rotating ring fitted on it. One end face of the rotating ring has an annular lubrication groove, and this groove divides the end face into an inner and outer ring face. A connecting hole is formed along the axial direction of the rotating ring, with one end of the hole located on the other end face and the other end communicating with the lubrication groove. A stationary ring is fitted onto the shaft sleeve, with both the inner and outer ring faces of the rotating ring sealingly fitted to the end face of the stationary ring, and the end face of the stationary ring sealing the opening of the lubrication groove. The beneficial effects of this utility model are: the addition of a lubrication groove to the sealing surface of the rotating ring improves the working environment of the sealing surface, increases the lubricity between the rotating and stationary rings, significantly reduces the coefficient of friction, and extends the service life of the mechanical seal.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology and relates to a cartridge-type mechanical seal. Background Technology

[0002] Mechanical seals are widely used in equipment such as pumps, compressors, and mixing machinery. Their function is to isolate the leakage path between rotating parts (such as shafts) and stationary structural cavities, preventing harmful media within the cavity from leaking to the outside. Mechanical seals typically consist of a moving component fixed to the shaft and a stationary component fixed to the cavity.

[0003] Spring mechanical seals are a commonly used mechanical seal structure, generally including a rotating ring, a sealing ring, a pressure element (spring), and metal structural components. The rotating ring and the stationary ring are a pair of highly flat friction pairs. Under the positive pressure applied by the spring, the rotating ring and the stationary ring fit tightly together to form a sealing surface. The gap between the rotating and stationary rings when they rotate relative to each other is on the order of micrometers, which can effectively prevent internal fluid from leaking from the sealing surface.

[0004] During the operation of a mechanical seal, although the coefficient of friction between the rotating ring and the stationary ring is very small, frictional heat and tiny wear particles are still generated during the relative motion of the rotating ring and the stationary ring. The surface morphology deterioration caused by wear will increase the interfacial friction coefficient, generate more frictional heat and wear particles, thus leading to a vicious cycle. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a cartridge-type mechanical seal.

[0006] The objective of this utility model can be achieved through the following technical solution: a cartridge-type mechanical seal, comprising:

[0007] A bushing, on which a rotating ring is fitted, has an annular lubrication groove on one end face of the rotating ring, and the lubrication groove divides the one end face of the rotating ring into an inner ring face and an outer ring face. The rotating ring has a connecting hole along its axial direction, one end of the connecting hole is located on the other end face of the rotating ring and the other end is connected to the lubrication groove.

[0008] A stationary ring is fitted onto the bushing. The inner and outer ring surfaces of the rotating ring are sealed against the end face of the stationary ring, and the end face of the stationary ring seals the opening of the lubrication groove.

[0009] Preferably, the bushing is provided with a drive pin, which is inserted into the communicating hole to lock the moving ring circumferentially with the bushing, and a gap is reserved between the outer peripheral surface of the drive pin and the wall of the communicating hole.

[0010] Preferably, the bushing is provided with a spring, the spring being in contact with the moving ring, and the spring applying a spring force to the moving ring to make it tend toward the stationary ring.

[0011] Preferably, there are multiple springs, and each spring is arranged in a ring around the bushing.

[0012] Preferably, the inner ring surface, the lubrication groove, and the outer ring surface form a concentric circle structure arranged sequentially from the inside to the outside.

[0013] Preferably, it also includes a sealing disc, which is sleeved on the bushing, and the stationary ring is installed on the sealing disc, and the stationary ring is circumferentially locked to the sealing disc.

[0014] Preferably, the areas on the bushing located on both sides of the sealing disc are the atmospheric side and the medium side, respectively, the moving ring and the stationary ring are both located on the medium side, and the connecting hole communicates with the medium side.

[0015] Preferably, sealing rings are provided between the moving ring and the bushing, and between the stationary ring and the sealing disc.

[0016] Preferably, the device further includes a locking ring and two retaining rings. The locking ring is sleeved on the bushing, and the inner circumferential surface of the locking ring is in contact with the outer circumferential surface of the bushing. The outer wall of the locking ring is provided with two outer conical surfaces. The inner circumferential surfaces of the two retaining rings are set as inner conical surfaces. Both retaining rings are sleeved on the locking ring, and the retaining rings are slidably connected to the locking ring. The inner conical surfaces of the two retaining rings respectively contact the two outer conical surfaces of the locking ring and form a wedge structure.

[0017] Preferably, the large ends of the two outer conical surfaces are located in the middle of the locking ring, the small ends of the two outer conical surfaces are located at the two ends of the locking ring, and the two retaining rings are connected by a bolt.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. A lubrication groove is added to the sealing surface of the rotating ring. The liquid in the lubrication groove can improve the working environment of the sealing surface, increase the lubricity between the rotating ring and the stationary ring, significantly reduce the coefficient of friction, and extend the service life of the mechanical seal.

[0020] 2. The drive pin is a pin-shaped component fixed to the bushing. It is inserted into the connecting hole of the rotating ring to transmit torque, causing the rotating ring to rotate with the bushing (circumferential locking) and preventing the rotating ring from slipping. The gap between the drive pin and the connecting hole allows liquid to flow into the lubrication groove through the connecting hole, ensuring lubrication.

[0021] 3. When the bolts are tightened, the two retaining rings move closer to each other and towards the center of the locking ring. Due to the conical design, the retaining rings force the locking ring to contract radially, and the locking ring forces the bushing to contract radially, resulting in an interference fit between the bushing and the shaft. This design provides uniform clamping force, is easy to install, and has good vibration resistance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the cartridge mechanical seal of this utility model.

[0023] Figure 2 This is a half-sectional schematic diagram of the moving ring of this utility model.

[0024] Figure 3 This is a schematic diagram showing the connection relationship between the locking ring, retaining ring, and bushing of this utility model.

[0025] In the diagram, 100 is the bushing; 110 is the drive pin; 120 is the spring; 200 is the moving ring; 210 is the lubrication groove; 220 is the inner ring face; 230 is the outer ring face; 240 is the connecting hole; 300 is the stationary ring; 400 is the sealing disc; 500 is the locking ring; 510 is the outer conical surface; 600 is the retaining ring; 610 is the inner conical surface; and 700 is the bolt. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figures 1 to 3 As shown, a cartridge-type mechanical seal includes:

[0028] A bushing 100 is fitted with a rotating ring 200. A ring-shaped lubrication groove 210 is formed on one end face of the rotating ring 200, and the lubrication groove 210 divides the one end face of the rotating ring 200 into an inner ring surface 220 and an outer ring surface 230. A connecting hole 240 is formed along the axial direction of the rotating ring 200. One end of the connecting hole 240 is located on the other end face of the rotating ring 200 and the other end is connected to the lubrication groove 210.

[0029] The stationary ring 300 is sleeved on the bushing 100. The inner ring surface 220 and the outer ring surface 230 of the rotating ring 200 are sealed and fitted with the end face of the stationary ring 300, and the end face of the stationary ring 300 seals the opening of the lubrication groove 210.

[0030] The rotating ring 200 is fitted onto the bushing 100 and can rotate with the bushing 100. The lubrication groove 210 is used to contain lubricating fluid (such as the working medium on the medium side), forming a lubricating film between the sealing surfaces of the rotating ring 200 and the stationary ring 300 to reduce friction and wear. The inner ring surface 220 and the outer ring surface 230 are the annular surfaces of the rotating ring 200 and the stationary ring 300 that are sealed together. The connecting hole 240 allows the fluid on the medium side (e.g., the working medium) to flow into the lubrication groove 210 from the other end face of the rotating ring 200, so that the lubrication groove 210 is filled with fluid. The end face of the stationary ring 300 is sealed together with the inner ring surface 220 and the outer ring surface 230 of the rotating ring 200, sealing the opening of the lubrication groove 210, making the lubrication groove 210 a relatively closed lubrication chamber, and the fluid in the lubrication groove 210 can enter the sealing interface for lubrication.

[0031] It should be noted that even after precision polishing, the sealing surfaces of the rotating ring 200 and the stationary ring 300 are microscopically uneven. Therefore, when the rotating ring 200 and the stationary ring 300 rotate relative to each other, frictional heat and tiny wear particles are generated, leading to an increase in the coefficient of friction. To overcome this problem, a lubrication groove 210 is specially added to the rotating ring 200. The core function of the lubrication groove 210 is to act as a storage chamber for liquid (working medium). When the shaft rotates, the liquid in the lubrication groove 210 is carried into the tiny gap between the rotating ring 200 and the stationary ring 300, thereby lubricating the sealing surfaces (the contact surfaces between the inner ring surface 220 and the outer ring surface 230 and the stationary ring 300), significantly reducing the coefficient of friction of the sealing surfaces and fundamentally reducing the generation of frictional heat and wear. In addition, the liquid in the lubrication groove 210 also plays a cooling role, continuously carrying away the frictional heat generated in the sealing surface area, effectively preventing the sealing ring from overheating due to heat accumulation.

[0032] like Figure 1 As shown, based on the above embodiment, the bushing 100 is provided with a transmission pin 110. The transmission pin 110 is inserted into the connecting hole 240 to lock the moving ring 200 circumferentially with the bushing 100. A gap is reserved between the outer peripheral surface of the transmission pin 110 and the hole wall of the connecting hole 240.

[0033] The drive pin 110 is a pin-shaped component fixed to the bushing 100. It is inserted into the connecting hole 240 of the rotating ring 200 to transmit torque, causing the rotating ring 200 to rotate together with the bushing 100 (circumferential locking) and preventing the rotating ring 200 from slipping. The gap between the drive pin 110 and the connecting hole 240 allows liquid to flow into the lubrication groove 210 through the connecting hole 240, ensuring lubrication.

[0034] Based on the above embodiments, the bushing 100 is provided with a spring 120, which is in contact with the moving ring 200, and the spring 120 applies a spring force to the moving ring 200 to make it tend toward the stationary ring 300.

[0035] Preferably, there are multiple springs 120, and each spring 120 is arranged in a ring around the bushing 100.

[0036] Spring 120 provides continuous axial force, keeping the rotating ring 200 pressed against the stationary ring 300, ensuring a tight seal between the sealing surfaces, compensating for wear on the sealing surfaces, and maintaining a good seal. The design of multiple springs 120 provides uniform force.

[0037] Based on the above implementation, the inner ring surface 220, the lubrication groove 210 and the outer ring surface 230 form a concentric circle structure arranged sequentially from the inside to the outside.

[0038] like Figure 1 As shown, based on the above embodiment, it also includes a sealing disc 400, which is sleeved on the bushing 100, and a stationary ring 300 is installed on the sealing disc 400, and the stationary ring 300 is circumferentially locked to the sealing disc 400.

[0039] Based on the above embodiment, the areas on the bushing 100 located on both sides of the sealing disc 400 are respectively the atmospheric side and the medium side. The moving ring 200 and the stationary ring 300 are both located on the medium side, and the connecting hole 240 communicates with the medium side. The medium side corresponds to the side where the working medium is located, and the atmospheric side corresponds to the side of the atmospheric environment.

[0040] Preferably, sealing rings are provided between the moving ring 200 and the bushing 100, and between the stationary ring 300 and the sealing disc 400.

[0041] like Figure 1 , Figure 3 As shown, based on the above embodiment, it also includes a locking ring 500 and two retaining rings 600. The locking ring 500 is sleeved on the bushing 100, and the inner circumferential surface of the locking ring 500 is in contact with the outer circumferential surface of the bushing 100. The outer wall of the locking ring 500 is provided with two outer conical surfaces 510. The inner circumferential surfaces of the two retaining rings 600 are provided with inner conical surfaces 610. Both retaining rings 600 are sleeved on the locking ring 500, and the retaining rings 600 are slidably connected to the locking ring 500. The inner conical surfaces 610 of the two retaining rings 600 respectively contact the two outer conical surfaces 510 of the locking ring 500 and form a wedge structure.

[0042] The retaining ring 600 can apply radial compressive force to the locking ring 500 through the wedge mechanism, thereby applying radial compressive force to the bushing 100 through the locking ring 500. This causes the bushing 100 to partially shrink and deform inward, reducing the bore diameter of the bushing 100, so that the bushing 100 and the rotating shaft are interference-fitted, thereby achieving circumferential locking between the bushing 100 and the rotating shaft.

[0043] Based on the above implementation, the large ends of the two outer conical surfaces 510 are located in the middle of the locking ring 500, the small ends of the two outer conical surfaces 510 are located at both ends of the locking ring 500, and the two retaining rings 600 are connected by a bolt 700.

[0044] When bolt 700 is tightened, the two retaining rings 600 move closer to each other and towards the center of locking ring 500. Due to the conical design, retaining rings 600 force locking ring 500 to contract radially, and locking ring 500 forces bushing 100 to contract radially, resulting in an interference fit between bushing 100 and the shaft. This design provides uniform clamping force, is easy to install, and has good vibration resistance.

[0045] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0046] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A cartridge-type mechanical seal, characterized in that, include: A bushing (100) is provided with a rotating ring (200). A ring-shaped lubrication groove (210) is formed on one end face of the rotating ring (200), and the lubrication groove (210) divides the end face of the rotating ring (200) into an inner ring face (220) and an outer ring face (230). A connecting hole (240) is formed along the axial direction of the rotating ring (200). One end of the connecting hole (240) is located on the other end face of the rotating ring (200), and the other end is connected to the lubrication groove (210). A stationary ring (300) is sleeved on the bushing (100). The inner ring surface (220) and the outer ring surface (230) of the moving ring (200) are sealed and fitted with the end face of the stationary ring (300), and the end face of the stationary ring (300) seals the opening of the lubrication groove (210).

2. A cartridge-type mechanical seal as described in claim 1, characterized in that: The bushing (100) is provided with a transmission pin (110), which is inserted into the connecting hole (240) to lock the moving ring (200) circumferentially with the bushing (100). A gap is reserved between the outer circumferential surface of the transmission pin (110) and the hole wall of the connecting hole (240).

3. A cartridge-type mechanical seal as described in claim 1, characterized in that: The bushing (100) is provided with a spring (120), which is in contact with the moving ring (200) and applies a spring force to the moving ring (200) to make it tend toward the stationary ring (300).

4. A cartridge-type mechanical seal as described in claim 3, characterized in that: There are multiple springs (120), and each spring (120) is arranged in a ring around the bushing (100).

5. A cartridge-type mechanical seal as described in claim 1, characterized in that: The inner ring surface (220), the lubrication groove (210), and the outer ring surface (230) form a concentric circle structure arranged sequentially from the inside to the outside.

6. A cartridge-type mechanical seal as described in claim 1, characterized in that: It also includes a sealing disc (400), which is sleeved on the bushing (100), and a stationary ring (300) is installed on the sealing disc (400), and the stationary ring (300) is circumferentially locked to the sealing disc (400).

7. A cartridge-type mechanical seal as described in claim 6, characterized in that: The areas on the bushing (100) located on both sides of the sealing disc (400) are the atmospheric side and the medium side, respectively. The moving ring (200) and the stationary ring (300) are both located on the medium side, and the connecting hole (240) is connected to the medium side.

8. A cartridge-type mechanical seal as described in claim 6, characterized in that: A sealing ring is provided between the moving ring (200) and the bushing (100) and between the stationary ring (300) and the sealing disc (400).

9. A cartridge-type mechanical seal as described in claim 1, characterized in that: It also includes a locking ring (500) and two retaining rings (600). The locking ring (500) is sleeved on the bushing (100), and the inner circumferential surface of the locking ring (500) is in contact with the outer circumferential surface of the bushing (100). The outer wall of the locking ring (500) is provided with two outer conical surfaces (510). The inner circumferential surfaces of the two retaining rings (600) are set as inner conical surfaces (610). Both retaining rings (600) are sleeved on the locking ring (500), and the retaining rings (600) are slidably connected to the locking ring (500). The inner conical surfaces (610) of the two retaining rings (600) respectively contact the two outer conical surfaces (510) of the locking ring (500) and form a wedge structure.

10. A cartridge-type mechanical seal as described in claim 9, characterized in that: The large ends of the two outer conical surfaces (510) are located in the middle of the locking ring (500), and the small ends of the two outer conical surfaces (510) are located at the two ends of the locking ring (500). The two retaining rings (600) are connected by a bolt (700).

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