High parameter silicon carbide mechanical seal device

Abstract

This invention discloses a high-parameter silicon carbide mechanical seal device, including a gland (1), a moving ring seat (2), a sealing moving ring (3), a sealing stationary ring (4), a stationary ring seat (5), and a bushing (6); the front end of the sealing stationary ring (4) extends out of the stationary ring seat (5), and the inner wall of the body of the sealing stationary ring (4) located in the stationary ring seat (5) is tightly fitted with a support ring (7); the gland (1) has a flushing fluid inlet, a flushing fluid outlet, a coolant inlet, and a coolant outlet; the flushing fluid is high pressure, enters from the flushing fluid inlet of the gland to flush the spring (9) and the sealing surface, and then flows out from the flushing fluid outlet while carrying away heat; the flushing fluid of this mechanical seal avoids directly flushing the sealing surface, which can reduce the pressure of the flushing fluid on the sealing stationary ring, while increasing the support strength of the sealing stationary ring and separating flushing and cooling into two separate structures.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, specifically to a high-parameter silicon carbide mechanical seal device. Background Technology

[0002] A silicon carbide mechanical seal device for a slurry pump is currently disclosed, comprising a bushing connected to a pump shaft and a gland connected to a pump body. The bushing is fixed outside the pump shaft and passes through a hole in the gland. The bushing has two sealing mechanisms: a first sealing mechanism and a second sealing mechanism. The first sealing mechanism is located inside the pump chamber on the inner side of the gland, and the second sealing mechanism is located outside the gland. The first sealing mechanism comprises a first rotating ring, a first stationary ring, a first stationary ring seat, a first rotating ring seat, and a spring. The first rotating ring, first stationary ring, first stationary ring seat, and first rotating ring seat are all sleeved outside the bushing. The first rotating ring seat is fixed to the inner end of the bushing. The first rotating ring is fixed to one end of the first rotating ring seat, and the first stationary ring is fixed to one end of the first stationary ring seat. A portion of the first stationary ring seat is located inside a through hole in the gland, and its outer wall seals against the inner wall of the gland. A spring seat is provided inside the through hole of the gland, and the inner end of the spring seat... The second sealing mechanism, circumferentially linked to the first stationary ring seat, includes a second rotating ring, a second stationary ring, a second stationary ring seat, a second rotating ring seat, and a drive ring. The second rotating ring, second stationary ring, second stationary ring seat, and drive ring are all fitted over the bushing. The second rotating ring seat is fixed to the drive ring, and the drive ring is fixed to the bushing. One end of the second rotating ring is fixed to the second rotating ring seat, and one end of the second stationary ring is fixed to the second stationary ring seat. The outer end of the spring seat abuts against one end of the spring, and the other end of the spring abuts against the second stationary ring seat. One end of the first stationary ring is tightly pressed against one end of the first rotating ring by the spring to form a first sealing surface. The other end of the second stationary ring is tightly pressed against one end of the second rotating ring by the spring to form a second sealing surface. A closed cooling cavity is formed between the first sealing surface, the second sealing surface, the first rotating ring seat, the second stationary ring seat, the spring seat, and the bushing. The gland is equipped with a flushing structure and a cooling structure.

[0003] The flushing structure includes a first liquid inlet channel. The inlet of the first liquid inlet channel is located on the outer wall of the gland, and the outlet is located on the inner end face of the gland and communicates with the pump chamber. The flushing liquid enters from the inlet of the first liquid inlet channel and exits from the outlet into the pump chamber.

[0004] The cooling structure includes at least one second liquid inlet channel and at least one second liquid outlet channel. The inlet of the second liquid inlet channel is located on the outer wall of the gland, and the outlet is located on the inner wall of the gland and communicates with the cooling cavity. The inlet of the second liquid outlet channel is located on the inner wall of the gland and communicates with the cooling cavity, and the outlet is located on the outer wall of the gland.

[0005] The mechanical seal with the above structure has the following disadvantages:

[0006] 1. The flushing structure cannot reach the sealing surface directly because the sealing surface is located inside the fluid medium. It can only carry away impurities accumulated outside the sealing surface, and the cooling effect can only play a certain role on the stationary ring seat.

[0007] 2. When encountering a stationary sealing ring made of graphite, the flushing fluid will squeeze the outer wall of the stationary sealing ring. Since the stationary sealing ring is a circular ring that is directly fitted to the inner wall of the stationary ring seat, the stationary sealing ring will extend out of the stationary ring seat and be squeezed inward by the pressure of the flushing fluid, causing deformation. This will affect the sealing surface that abuts against the moving sealing ring.

[0008] 3. The cooling structure only faces the sealing surface and cannot cool the tail of the sealing stationary ring and the spring, so the cooling effect is too limited. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a high-parameter silicon carbide mechanical seal device that avoids direct flushing of the sealing surface by the flushing fluid, reduces the pressure of the flushing fluid on the sealing stationary ring, increases the support strength of the sealing stationary ring, and separates flushing and cooling into two separate structures.

[0010] The technical solution of the present invention is to provide a high-parameter silicon carbide mechanical seal device with the following structure, including a gland, a rotating ring seat, a sealing rotating ring, a sealing stationary ring, a stationary ring seat, and a bushing; one end of the bushing is provided with a convex ring, the rotating ring seat is sleeved outside the bushing and a first annular groove is formed between the rotating ring seat and the bushing, the bottom surface of the first annular groove is the inner end face of the convex ring; the sealing rotating ring is located in the first annular groove and is radially limited by multiple first pins; the stationary ring seat is provided in the central hole of the gland, the sealing stationary ring is provided in the stationary ring seat, the central hole of the gland is provided with a step, the step is provided with multiple mounting holes parallel to the axis, a part of the mounting holes is used to install a spring, and another part is provided with a second pin, the spring and the second pin are alternately spaced; one end of the spring abuts against the first annular step on the outer wall of the stationary ring seat, and the other end abuts against the inner bottom surface of the mounting hole, the spring pushes the stationary ring seat and the sealing stationary ring so that the end face of the sealing stationary ring abuts against the end face of the sealing rotating ring to form a sealing surface;

[0011] The feature is that: the front end of the sealing stationary ring extends out of the stationary ring seat and the inner wall of the body of the sealing stationary ring located within the stationary ring seat is tightly fitted with a support ring; the gland is provided with a flushing fluid inlet, a flushing fluid outlet, a coolant inlet, and a coolant outlet; the flushing fluid is high pressure, enters from the flushing fluid inlet of the gland to flush the spring and the sealing surface, and then flows out from the flushing fluid outlet while carrying away heat; the coolant enters from the coolant inlet of the gland, flushes the outer wall of the bushing, the end face of the sealing moving ring, the outer wall of the part of the sealing stationary ring extending out of the stationary ring seat, the inner wall and end face of the stationary ring seat, the inner wall of the gland, and the first cavity formed by the throttling ring provided at the tail end of the gland, and then flows out from the coolant outlet while carrying away heat.

[0012] The outer wall of the moving ring seat and the inner wall of the gland at the same end are provided with a first channel. The pressure of the flushing fluid is greater than the fluid pressure in the pump body. A portion of the coolant enters the fluid through the first channel. The flushing fluid carries away the heat from the moving ring seat, the sealing moving ring, the sealing stationary ring, and the stationary ring seat.

[0013] The flushing fluid outlet faces the position where the spring is installed on the stationary ring seat. When the high-pressure flushing fluid flows through, it carries away the impurities and heat from the spring.

[0014] The outer end of the support ring is flush with the outer end face of the stationary ring seat, and the inner end abuts against the inner end face of the stationary ring seat.

[0015] The inner wall of the portion of the sealing stationary ring extending out of the stationary ring seat and the inner side of the sealing surface are both part of the first cavity.

[0016] A first sealing ring and a gasket are provided between the outer wall of the stationary ring seat and the inner wall of the gland. The first sealing ring isolates the channel through which the flushing fluid passes from the channel through which the coolant passes.

[0017] The throttling ring is embedded in the stepped hole at the end of the pressure cap and its outer end is axially positioned by a positioning block. The positioning block is semi-circular, and the outer wall of the bushing is provided with a second annular groove. The bottom of the positioning block is embedded in the second annular groove and fixed to the pressure cap.

[0018] With the above structure, the present invention has the following advantages:

[0019] 1. The flushing fluid is high pressure. It enters from the flushing fluid inlet of the gland to flush the spring and sealing surface and then flows out from the flushing fluid outlet, carrying away heat at the same time. The flushing range is wider, and the pressure of the high-pressure flushing fluid can resist the pressure of the fluid in the pump body, thereby preventing the fluid from entering the sealing surface, so that the sealing surface only comes into contact with the flushing fluid, which can better protect the sealing surface and effectively cool the sealing surface.

[0020] 2. Because the front end of the stationary sealing ring extends out of the stationary ring seat and the inner wall of the stationary sealing ring body within the stationary ring seat is tightly fitted with a support ring, due to the structural characteristics of this mechanical seal, the stationary sealing ring is made of graphite material, which has poor hardness. Therefore, the use of a support ring ensures the strength of the stationary sealing ring. Under the high pressure of the flushing fluid on the stationary sealing ring on the sealing surface side, the support ring provides strength to the stationary sealing ring, preventing deformation due to inward compression.

[0021] 3. Since the coolant enters from the coolant inlet of the gland, it passes through the outer wall of the bushing, the end face of the sealing ring, the outer wall of the part of the sealing ring extending from the stationary ring seat, the inner wall and end face of the stationary ring seat, the inner wall of the gland, and the throttling ring at the tail end of the gland, forming the first cavity. Then it flows out from the coolant outlet and carries away the heat. When the coolant passes through, it can come into contact with a large number of components, which can realize heat exchange, thereby carrying away the heat and achieving a good cooling effect.

[0022] As an improvement, a first channel is provided between the outer wall of the moving ring seat and the inner wall of the gland at the same end. The pressure of the flushing fluid is greater than the fluid pressure in the pump body. A portion of the coolant enters the fluid through the first channel. The flushing fluid carries away the heat from the moving ring seat, the sealing moving ring, the sealing stationary ring, and the stationary ring seat, increasing the contact area of ​​the coolant and preventing the fluid from contacting the sealing surface.

[0023] As an improvement, the flushing fluid outlet faces the position where the spring is mounted on the stationary ring seat. When the high-pressure flushing fluid flows through, it carries away impurities and heat from the spring, preventing spring failure and increasing reliability.

[0024] As an improvement, the outer end of the support ring is flush with the outer end face of the stationary ring seat, and the inner end abuts against the inner end face of the stationary ring seat, so that the protruding part contacts the sealing moving ring.

[0025] As an improvement, a first sealing ring and a gasket are provided between the outer wall of the stationary ring seat and the inner wall of the gland. The first sealing ring isolates the channel through which the flushing fluid passes from the channel through which the coolant passes, preventing the flushing fluid and coolant from mixing. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of the mechanical seal of the present invention.

[0027] Figure 2 This is a schematic diagram of the assembly of the stationary sealing ring and stationary ring seat of the mechanical seal of the present invention.

[0028] Figure 3 This is a cross-sectional schematic diagram of the cap of the present invention.

[0029] As shown in the figure:

[0030] 1. Gland, 1.1. Mounting hole, 2. Rotary ring seat, 3. Sealing rotating ring, 4. Sealing stationary ring, 5. Stationary ring seat, 6. Bushing, 6.1. Convex ring, 7. Support ring, 8. First pin, 9. Spring, 10. Second pin, 11. Throttling ring, 12. First sealing ring, 13. Gasket, 14. Positioning block. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] like Figure 1-3 As shown, a high-parameter silicon carbide mechanical seal device of the present invention includes a gland 1, a moving ring seat 2, a sealing moving ring 3, a sealing stationary ring 4, a stationary ring seat 5, and a bushing 6; one end of the bushing 6 is provided with a convex ring 6.1, the moving ring seat 2 is sleeved on the bushing 6 and a first annular groove is formed between the moving ring seat 2 and the bushing 6, the bottom surface of the first annular groove is the inner end face of the convex ring 6.1; the sealing moving ring 3 is located in the first annular groove and is radially limited by multiple first pins 8, so that the sealing moving ring 3 and the moving ring seat 2 are circumferentially positioned and rotate synchronously during rotation.

[0033] The stationary ring seat 5 is located in the center hole of the pressure cover 1, and the sealing stationary ring 4 is located in the stationary ring seat 5. The center hole of the pressure cover 1 is provided with a step, and the step is provided with a plurality of mounting holes 1.1 parallel to the axis. A part of the mounting hole 1.1 is used to install a spring 9, and another part is provided with a second pin 10. The spring 9 and the second pin 10 are alternately spaced.

[0034] One end of the spring 9 abuts against the first annular step on the outer wall of the stationary ring seat 5, and the other end abuts against the inner bottom surface of the mounting hole 1.1. The spring 9 pushes the stationary ring seat 5 and the sealing stationary ring 4 so that the end face of the sealing stationary ring 4 abuts against the end face of the sealing moving ring 3 to form a sealing surface.

[0035] The front end of the sealing stationary ring 4 extends out of the stationary ring seat 5 and the inner wall of the main body of the sealing stationary ring 4 located in the stationary ring seat 5 is tightly fitted with a support ring 7. Since the sealing stationary ring 4 of this structure is made of graphite material, it is softer than ordinary silicon carbide material. Under the pressure of high-pressure flushing fluid and being squeezed and deformed, the addition of the support ring 7 can increase the strength of the sealing stationary ring 4, prevent inward deformation, and prevent the sealing stationary ring from deforming under the pressure of flushing fluid.

[0036] like Figure 1 and Figure 3As shown, the gland 1 is provided with a flushing fluid inlet A, a flushing fluid outlet B, a coolant inlet C, and a coolant outlet D; the flushing fluid is high pressure, which is higher than the pressure of the medium fluid in the pump body. The outer wall of the moving ring seat 2 and the inner wall of the gland 1 at the same end are provided with a first channel. The pressure of the flushing fluid is greater than the fluid pressure in the pump body. A portion of the coolant enters the fluid through the first channel. The flushing fluid carries away the heat from the moving ring seat 2, the sealing moving ring 3, the sealing stationary ring 4, and the stationary ring seat 5.

[0037] The flushing fluid enters through the flushing fluid inlet of the gland to flush the spring 9 and the sealing surface, and then flows out through the flushing fluid outlet, carrying away heat at the same time. Specifically, the flushing fluid enters through the flushing fluid inlet A, most of it flows out through the flushing fluid outlet B, and a small portion enters the pump body through the gap between the inner wall of the gland 1 and the outer wall of the moving ring seat 2. At the same time, the high-pressure flushing fluid can prevent the medium in the pump body from entering the sealing surface.

[0038] Coolant enters from the coolant inlet of the gland, passes through the first cavity formed by the outer wall of the bushing 6, the end face of the sealing ring 3, the outer wall of the portion of the sealing ring 4 extending from the stationary ring seat 5, the inner wall and end face of the stationary ring seat 5, the inner wall of the gland 1, and the throttling ring 11 located at the tail end of the gland, and then flows out from the coolant outlet, carrying away heat. For example... Figure 1 The end face of the sealing ring 3 is located on the leftmost side wall of the first cavity, the outer wall of the bushing 6 is the inner wall of the first cavity, the throttling ring 11 is the rightmost side wall of the first cavity, and the outer inner surface of the first cavity is formed by the outer wall of the part of the sealing ring 4 that extends out of the stationary ring seat 5, the inner wall and end face of the stationary ring seat 5, and the inner wall of the pressure cap 1.

[0039] The flushing fluid outlet faces the position where the spring 9 is installed on the stationary ring seat 5. When the high-pressure flushing fluid flows through, it carries away the impurities and heat on the spring 9.

[0040] In addition, the flushing fluid enters from the flushing fluid inlet A, flows out along the outer wall of the stationary ring seat 5 and then out through the flushing fluid outlet B. At this time, a certain negative pressure will be generated in the cavity between the outer side of the sealing surface, that is, the end face of the stationary ring seat 5 and the end face of the moving ring seat 2. The impurities deposited on the sealing surface will be carried away by the flowing flushing fluid.

[0041] The outer end of the support ring 7 is flush with the outer end face of the stationary ring seat 5, and the inner end abuts against the inner end face of the stationary ring seat 5, so that the support ring 7 provides maximum support for the sealing stationary ring 4.

[0042] The inner wall of the portion of the sealing ring 4 extending out of the sealing ring seat 5 and the inner side of the sealing surface are both part of the first cavity.

[0043] A first sealing ring 12 and a gasket 13 are provided between the outer wall of the stationary ring seat 5 and the inner wall of the pressure cover 1. The first sealing ring 12 isolates the channel through which the flushing fluid passes from the channel through which the coolant passes.

[0044] The throttling ring 11 is embedded in the stepped hole at the end of the pressure cover 1 and its outer end is axially positioned by the positioning block 14. The positioning block 14 is semi-circular. The outer wall of the bushing 6 is provided with a second annular groove. The bottom of the positioning block 14 is embedded in the second annular groove and fixed to the pressure cover 1. The fixing method is bolt connection, which can realize detachable assembly and disassembly.

Claims

1. A high-parameter silicon carbide mechanical seal device, comprising a gland (1), a rotating ring seat (2), a sealing rotating ring (3), a sealing stationary ring (4), a stationary ring seat (5), and a bushing (6); one end of the bushing (6) is provided with a convex ring (6.1), the rotating ring seat (2) is sleeved outside the bushing (6) and a first annular groove is formed between the rotating ring seat (2) and the bushing (6), the bottom surface of the first annular groove being the inner end face of the convex ring (6.1); the sealing rotating ring (3) is located in the first annular groove and is radially limited by multiple first pins (8); the stationary ring seat (5) is disposed in the central hole of the gland (1), and the sealing stationary ring (4) Inside the stationary ring seat (5), the center hole of the pressure cap (1) is provided with a step, and the step is provided with a plurality of mounting holes (1.1) parallel to the axis. A spring (9) is installed in a part of the mounting hole (1.1), and a second pin (10) is provided in another part. The spring (9) and the second pin (10) are alternately spaced. One end of the spring (9) abuts against the first annular step on the outer wall of the stationary ring seat (5), and the other end abuts against the inner bottom surface of the mounting hole (1.1). The spring (9) pushes the stationary ring seat (5) and the sealing stationary ring (4) so ​​that the end face of the sealing stationary ring (4) abuts against the end face of the sealing moving ring (3) to form a sealing surface. Its features are: The front end of the sealing stationary ring (4) extends out of the stationary ring seat (5), and the inner wall of the body of the sealing stationary ring (4) located in the stationary ring seat (5) is tightly fitted with a support ring (7). The pressure cap (1) is provided with a flushing fluid inlet, a flushing fluid outlet, a coolant inlet, and a coolant outlet. The flushing fluid is high pressure, enters from the flushing fluid inlet of the pressure cap to flush the spring (9) and the sealing surface, and then flows out from the flushing fluid outlet while carrying away heat. The coolant enters from the coolant inlet of the pressure cap, cleans the outer wall of the bushing (6), the end face of the sealing moving ring (3), the outer wall of the part of the sealing stationary ring (4) that extends out of the stationary ring seat (5), the inner wall and end face of the stationary ring seat (5), the inner wall of the pressure cap (1), and the first cavity formed by the throttling ring (11) provided at the tail end of the pressure cap, and then flows out from the coolant outlet while carrying away heat. The outer wall of the moving ring seat (2) and the inner wall of the pressure cap (1) at the same end are provided with a first channel. The pressure of the flushing liquid is greater than the fluid pressure in the pump body. A portion of the coolant enters the fluid through the first channel. The flushing liquid carries away the heat of the moving ring seat (2), the sealing moving ring (3), the sealing stationary ring (4), and the stationary ring seat (5). The outer end of the support ring (7) is flush with the outer end face of the stationary ring seat (5), and the inner end abuts against the inner end face of the stationary ring seat (5).

2. The high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: The flushing fluid outlet faces the position where the spring (9) is installed on the static ring seat (5). When the high-pressure flushing fluid flows through, it carries away the impurities and heat on the spring (9).

3. The high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: The inner wall of the portion of the sealing ring (4) extending out of the sealing ring seat (5) and the inner side of the sealing surface are both part of the first cavity.

4. The high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: A first sealing ring (12) and a gasket (13) are provided between the outer wall of the static ring seat (5) and the inner wall of the pressure cap (1). The first sealing ring (12) isolates the channel through which the flushing fluid passes from the channel through which the coolant passes.

5. The high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: The throttling ring (11) is embedded in the stepped hole at the end of the pressure cap (1) and its outer end is axially positioned by the positioning block (14). The positioning block (14) is semi-circular. The outer wall of the bushing (6) is provided with a second annular groove. The bottom of the positioning block (14) is embedded in the second annular groove and fixed to the pressure cap (1).

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