A containerized mechanical seal device

Abstract

This utility model provides a cartridge-type mechanical seal device, characterized in that it includes: a bushing; a sealing disc with a hole through which the bushing passes; a transmission sleeve fitted onto the bushing, coaxially arranged and circumferentially locked, the transmission sleeve having an installation cavity with a stepped hole structure, the second annular cavity having a wider ring than the first annular cavity; a rotating ring fitted onto the bushing, located within the second annular cavity; a stationary ring installed within the hole of the sealing disc, sealingly fitting the stationary ring and the rotating ring; one end of a spring located within the first annular cavity and abutting against the transmission sleeve, the other end of the spring abutting against the rotating ring and applying a spring force to the rotating ring to press it against the stationary ring, a gap between the outer surface of the spring and the inner wall of the large hole portion of the installation cavity; the beneficial effect of this utility model is that it provides a mechanical seal suitable for viscous media environments, and the spring is less likely to lose its elasticity in viscous media environments.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology and relates to a cartridge-type mechanical seal device. 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] Since the seal between the rotating and stationary rings relies on the spring force, the sealing surface formed by the rotating and stationary rings will fail if the spring fails. In some viscous media environments, due to the high viscosity and poor flowability of the medium, once it enters the space around the spring, it will adhere to the gaps between the spring rings and all internal surfaces. The spring is actually blocked by the viscous medium or its solidified form, forming a whole. This causes the spring to lose its elasticity and become unable to compensate for normal wear of the sealing end face or adapt to axial movement during equipment operation, leading to sealing surface failure. Utility Model Content

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

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

[0007] bushing;

[0008] A sealing disc, wherein the sealing disc is provided with a disc hole, the bushing passes through the disc hole, the diameter of the disc hole is larger than the diameter of the bushing, and the bushing and the disc hole are coaxially arranged;

[0009] A transmission sleeve is fitted onto the bushing. The transmission sleeve and the bushing are coaxially arranged and circumferentially locked. The transmission sleeve has an installation cavity, which is a stepped hole structure. A first annular cavity is formed between the inner wall surface of the small hole portion of the installation cavity and the outer wall surface of the bushing. A second annular cavity is formed between the inner wall surface of the large hole portion of the installation cavity and the outer wall surface of the bushing. The annular width of the second annular cavity is greater than the annular width of the first annular cavity.

[0010] A rotating ring is sleeved on the bushing and located within the second annular cavity; the rotating ring is circumferentially locked to the bushing.

[0011] A stationary ring is installed in the hole of the sealing disc, the stationary ring is circumferentially locked to the sealing disc, and the stationary ring is sealed and fitted to the rotating ring;

[0012] A spring is sleeved on the bushing and located inside the mounting cavity. One end of the spring is located inside the first annular cavity and abuts against the transmission sleeve. The other end of the spring abuts against the moving ring and applies an elastic force to the moving ring to press it against the stationary ring. There is a gap between the outer surface of the spring and the inner wall surface of the large hole portion of the mounting cavity.

[0013] Preferably, the disc hole has a stepped hole structure, the stationary ring is installed in the small hole portion of the disc hole, and the sealing surface formed by the moving ring and the stationary ring is located in the large hole portion of the disc hole.

[0014] Preferably, the sealing disc is provided with a cleaning hole, one end of which is located on the outer peripheral surface of the sealing disc, and the other end of which is connected to the large hole portion of the disc hole.

[0015] Preferably, the transmission sleeve has a through hole in the wall of the large hole portion of the mounting cavity, and the second annular cavity communicates with the large hole portion of the disc hole through the through hole.

[0016] Preferably, the inner circumferential surface of the bushing is provided with two annular grooves, the two annular grooves are arranged sequentially along the axial direction of the bushing, and a first sealing ring is provided in each of the two annular grooves.

[0017] Preferably, a positioning block is provided on one end face of the sealing disc, and a positioning groove is provided on the bushing. The positioning block is disposed in the positioning groove and is axially locked to the bushing. The sealing disc is axially locked to the bushing by the positioning block.

[0018] Preferably, a sealing gasket is provided on the other side of the sealing disc.

[0019] Preferably, the bushing is provided with a shoulder portion, and one end of the transmission sleeve near the small hole portion of the mounting cavity is sealed and fitted with the end face of the shoulder portion.

[0020] Preferably, the inner circumferential surface of the port at one end of the transmission sleeve and the shoulder of the shaft fits and seals against the outer circumferential surface of the sleeve.

[0021] Preferably, a second sealing ring is provided between the moving ring and the bushing, and a third sealing ring is provided between the stationary ring and the sealing disc.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. A mechanical seal suitable for viscous media environments is provided, wherein the spring does not easily lose its elasticity in viscous media environments.

[0024] 2. The cleaning port is the channel connecting the mechanical seal to the external cleaning system. The cleaning fluid (medium) can be injected into the large hole of the disc through the cleaning port, thereby flushing the rotating ring and stationary ring, removing a large amount of heat generated by the high-speed rotation friction of the sealing end face, preventing the sealing ring from failing due to overheating, and providing lubrication for the sealing surface to reduce wear.

[0025] 3. The through hole can connect the second annular cavity inside the transmission sleeve with the large hole of the disc hole, thereby connecting the cleaning hole with the second annular cavity. The flushing fluid injected from the cleaning hole can enter the second annular cavity and directly flush the back of the spring and the moving ring, directly washing away any impurities that may accumulate on the spring and completely preventing jamming. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the containerized mechanical seal device of this utility model.

[0027] Figure 2 This is a schematic diagram showing the positions of the first annular cavity and the second annular cavity of this utility model.

[0028] In the figure, 100 is the bushing; 110 is the annular groove; 120 is the first sealing ring; 130 is the positioning groove; 140 is the shaft shoulder; 200 is the sealing disc; 210 is the disc hole; 220 is the cleaning hole; 230 is the positioning block; 240 is the sealing gasket; 300 is the transmission sleeve; 310 is the mounting cavity; 311 is the first annular cavity; 312 is the second annular cavity; 400 is the moving ring; 410 is the second sealing ring; 500 is the stationary ring; 510 is the third sealing ring; and 600 is the spring. Detailed Implementation

[0029] 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.

[0030] like Figure 1 , Figure 2 As shown, a cartridge-type mechanical seal device includes:

[0031] Bushing 100;

[0032] The sealing disc 200 has a disc hole 210. The bushing 100 passes through the disc hole 210. The diameter of the disc hole 210 is larger than the diameter of the bushing 100, and the bushing 100 and the disc hole 210 are coaxially arranged.

[0033] A transmission sleeve 300 is sleeved on a bushing 100. The transmission sleeve 300 and the bushing 100 are coaxially arranged and circumferentially locked. The transmission sleeve 300 has an installation cavity 310. The installation cavity 310 has a stepped hole structure. The inner wall surface of the small hole portion of the installation cavity 310 forms a first annular cavity 311 between the inner wall surface of the small hole portion of the installation cavity 310 and the outer wall surface of the bushing 100. The inner wall surface of the large hole portion of the installation cavity 310 forms a second annular cavity 312 between the inner wall surface of the large hole portion of the installation cavity 310 and the outer wall surface of the bushing 100. The annular width of the second annular cavity 312 is greater than the annular width of the first annular cavity 311.

[0034] The rotating ring 400 is sleeved on the bushing 100 and located inside the second annular cavity 312. The rotating ring 400 is circumferentially locked to the bushing 100.

[0035] The stationary ring 500 is installed in the disc hole 210 of the sealing disc 200. The stationary ring 500 is circumferentially locked to the sealing disc 200, and the stationary ring 500 is sealed and fitted to the rotating ring 400.

[0036] Spring 600 is sleeved on bushing 100 and located in mounting cavity 310. One end of spring 600 is located in the first annular cavity 311 and abuts against transmission sleeve 300. The other end of spring 600 abuts against moving ring 400 and applies a spring force to moving ring 400 to make it abut against stationary ring 500. There is a gap between the outer surface of spring 600 and the inner wall surface of the large hole portion of mounting cavity 310.

[0037] The bushing 100 is a cylindrical component fitted onto the rotating shaft, providing a mounting base for the rotating ring 400. The sealing disc 200 is typically mounted on the end cover or gland of the equipment. The sealing disc 200 has a central hole 210 for mounting the stationary ring 500. The spring 600 is located within the mounting cavity 310 of the transmission sleeve 300. When compressed, the spring 600 generates a continuous elastic force, which acts on the rotating ring 400, ensuring a tight fit between the rotating ring 400 and the stationary ring 500. When the sealing surface wears, the spring 600 extends slightly, continuing to push the rotating ring 400, maintaining sufficient clamping force.

[0038] The core advantage of this device lies in the stepped hole structure inside the transmission sleeve 300 and its matching design with the large spring 600. The first annular cavity 311 (small annular width) precisely accommodates and positions one end of the spring 600, and the small annular width gap effectively restricts the radial movement or wobbling of the end of the spring 600. The second annular cavity 312 (large annular width) has an annular width much larger than the outer diameter of the spring 600. This relatively large annular space can accommodate and store more medium. Due to the large space of the second annular cavity 312, viscous media flows better within it and is less likely to solidify, crystallize, or coke due to stagnation. This effectively avoids the risk of the spring 600 being trapped or jammed by solidified media, ensuring that the spring 600 can always freely expand and contract. Moreover, the spring 600 is designed as a large spring 600 structure, which further reduces the risk of the spring 600 failing due to the solidification of viscous media.

[0039] It should be further explained that if multiple small springs are used in the mechanical seal to provide the sealing pressure, these small springs will lose their elasticity if they are stuck to the viscous medium in the second annular cavity 312. However, if spring 600 is designed as a large spring, it can maintain its elasticity even if it is stuck to the viscous medium. In other words, the design of the large spring makes it less likely to lose its elasticity in viscous medium application environments, ensuring that spring 600 is less likely to fail.

[0040] A mechanical seal suitable for viscous media environments is provided, and the spring 600 does not easily lose its elasticity in viscous media environments.

[0041] like Figure 1 As shown, based on the above embodiment, the disc hole 210 has a stepped hole structure, the stationary ring 500 is installed in the small hole portion of the disc hole 210, and the sealing surface formed by the moving ring 400 and the stationary ring 500 is located in the large hole portion of the disc hole 210.

[0042] Based on the above embodiments, the sealing disk 200 is provided with a cleaning hole 220. One end of the cleaning hole 220 is located on the outer peripheral surface of the sealing disk 200, and the other end of the cleaning hole 220 is connected to the large hole portion of the disk hole 210.

[0043] The cleaning hole 220 is the channel connecting the mechanical seal to the external cleaning system. The cleaning fluid (medium) can be injected into the large hole of the disc hole 210 through the cleaning hole 220, thereby flushing the rotating ring 400 and the stationary ring 500, removing a large amount of heat generated by the high-speed rotation friction of the sealing end face, preventing the sealing ring from failing due to overheating, and providing lubrication for the sealing surface to reduce wear.

[0044] Based on the above implementation method, the transmission sleeve 300 has a through hole in the wall of the large hole portion of the mounting cavity 310, and the second annular cavity 312 is connected to the large hole portion of the disc hole 210 through the through hole.

[0045] The through hole connects the second annular cavity 312 inside the transmission sleeve 300 with the large hole portion of the disc hole 210, thereby connecting the cleaning hole 220 with the second annular cavity 312. The flushing fluid injected from the cleaning hole 220 can enter the second annular cavity 312 and directly flush the back of the spring 600 and the moving ring 400, directly washing away any impurities that may accumulate on the spring 600 and completely preventing jamming.

[0046] like Figure 1 As shown, based on the above embodiment, the inner circumferential surface of the bushing 100 is provided with two annular grooves 110, which are arranged sequentially along the axial direction of the bushing 100. Each of the two annular grooves 110 contains a first sealing ring 120. The two first sealing rings 120 provide a double sealing function, ensuring a reliable seal between the bushing 100 and the rotating shaft.

[0047] Based on the above embodiments, a positioning block 230 is provided on one end face of the sealing disc 200, and a positioning groove 130 is provided on the bushing 100. The positioning block 230 is disposed in the positioning groove 130 and axially locked with the bushing 100. The sealing disc 200 is axially locked with the bushing 100 through the positioning block 230.

[0048] Based on the above embodiment, a sealing gasket 240 is provided on the other side of the sealing disc 200. The sealing gasket 240 is used to abut against the end cover or gland of the equipment to form a sealed fit.

[0049] like Figure 1 As shown, based on the above embodiment, the bushing 100 is provided with a shoulder 140, and one end of the transmission sleeve 300 near the small hole of the mounting cavity 310 is sealed and fitted with the end face of the shoulder 140. The shoulder 140 of the bushing 100 has a radially protruding stepped structure, and the shoulder 140 provides an accurate axial positioning surface for the installation of the transmission sleeve 300.

[0050] Based on the above embodiment, the inner circumferential surface of the port at one end of the transmission sleeve 300 and the shoulder portion 140 is fitted and sealed to the outer circumferential surface of the bushing 100. Furthermore, the transmission sleeve 300 is circumferentially locked to the bushing 100 by a set screw.

[0051] Based on the above embodiments, a second sealing ring 410 is provided between the moving ring 400 and the bushing 100, and a third sealing ring 510 is provided between the stationary ring 500 and the sealing disc 200.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 device, characterized in that, include: Bushing (100); A sealing disc (200) is provided with a disc hole (210), and a bushing (100) passes through the disc hole (210). The diameter of the disc hole (210) is larger than the diameter of the bushing (100), and the bushing (100) and the disc hole (210) are coaxially arranged. A transmission sleeve (300) is sleeved on the bushing (100). The transmission sleeve (300) and the bushing (100) are coaxially arranged and circumferentially locked. The transmission sleeve (300) has an installation cavity (310). The installation cavity (310) has a stepped hole structure. The inner wall surface of the small hole portion of the installation cavity (310) and the outer wall surface of the bushing (100) form a first annular cavity (311). The inner wall surface of the large hole portion of the installation cavity (310) and the outer wall surface of the bushing (100) form a second annular cavity (312). The annular width of the second annular cavity (312) is greater than the annular width of the first annular cavity (311). A rotating ring (400) is sleeved on the bushing (100). The rotating ring (400) is located inside the second annular cavity (312). The rotating ring (400) is circumferentially locked to the bushing (100). A stationary ring (500) is installed in the hole (210) of the sealing disc (200). The stationary ring (500) is circumferentially locked to the sealing disc (200), and the stationary ring (500) is sealed and fitted to the moving ring (400). A spring (600) is sleeved on the bushing (100). The spring (600) is located in the mounting cavity (310). One end of the spring (600) is located in the first annular cavity (311) and abuts against the transmission sleeve (300). The other end of the spring (600) abuts against the moving ring (400) and applies a spring force to the moving ring (400) to make it press against the stationary ring (500). There is a gap between the outer surface of the spring (600) and the inner wall surface of the large hole portion of the mounting cavity (310).

2. The cartridge-type mechanical seal device as described in claim 1, characterized in that: The disc hole (210) has a stepped hole structure. The stationary ring (500) is installed in the small hole portion of the disc hole (210), and the sealing surface formed by the moving ring (400) and the stationary ring (500) is located in the large hole portion of the disc hole (210).

3. A cartridge-type mechanical seal device as described in claim 2, characterized in that: The sealing disc (200) is provided with a cleaning hole (220). One end of the cleaning hole (220) is located on the outer peripheral surface of the sealing disc (200), and the other end of the cleaning hole (220) is connected to the large hole portion of the disc hole (210).

4. A cartridge-type mechanical seal device as described in claim 3, characterized in that: The transmission sleeve (300) has a through hole in the wall of the large hole portion of the mounting cavity (310), and the second annular cavity (312) communicates with the large hole portion of the disc hole (210) through the through hole.

5. A cartridge-type mechanical seal device as described in claim 1, characterized in that: The inner circumferential surface of the bushing (100) is provided with two annular grooves (110), which are arranged sequentially along the axial direction of the bushing (100), and each of the two annular grooves (110) is provided with a first sealing ring (120).

6. A cartridge-type mechanical seal device as described in claim 1, characterized in that: A positioning block (230) is provided on one end face of the sealing disc (200), and a positioning groove (130) is provided on the bushing (100). The positioning block (230) is disposed in the positioning groove (130) and axially locked with the bushing (100). The sealing disc (200) is axially locked with the bushing (100) through the positioning block (230).

7. A cartridge-type mechanical seal device as described in claim 1 or 6, characterized in that: A sealing gasket (240) is provided on the other side of the sealing disc (200).

8. A cartridge-type mechanical seal device as described in claim 1, characterized in that: The bushing (100) is provided with a shoulder (140), and one end of the transmission sleeve (300) near the small hole of the mounting cavity (310) is sealed and fitted with the end face of the shoulder (140).

9. A cartridge-type mechanical seal device as described in claim 8, characterized in that: The inner circumferential surface of the port at one end of the transmission sleeve (300) and the shoulder portion (140) is fitted and sealed to the outer circumferential surface of the sleeve (100).

10. A cartridge-type mechanical seal device as described in claim 1, characterized in that: A second sealing ring (410) is provided between the moving ring (400) and the bushing (100), and a third sealing ring (510) is provided between the stationary ring (500) and the sealing disc (200).

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