CN115949752A - A high-parameter silicon carbide mechanical seal device - Google Patents

Abstract

The invention discloses a high-parameter silicon carbide mechanical sealing device which comprises a gland (1), a movable ring seat (2), a sealed movable ring (3), a sealed static ring (4), a static ring seat (5) and a shaft sleeve (6); the front end of the static sealing ring (4) extends out of the static ring seat (5), the inner wall of the body of the static sealing ring (4) in the static ring seat (5) is tightly provided with a support ring (7), and a flushing liquid inlet, a flushing liquid outlet, a cooling liquid inlet and a cooling liquid outlet of the gland (1) are formed; the washing liquid is high-pressure, enters from the washing liquid inlet of the gland to wash the spring (9) and the sealing surface, flows out from the washing liquid outlet and takes away heat; this mechanical seal's flush fluid avoids directly washing sealed face, can reduce the pressure of flush fluid to the extrusion of sealed quiet ring, increases the support intensity of sealed quiet ring simultaneously and will wash and cool off separately to be two sets of independent structures.

Description

A high-parameter silicon carbide mechanical seal device

technical field

The invention relates to the technical field of seals, in particular to a high-parameter silicon carbide mechanical seal device.

Background technique

At present, there is a disclosed silicon carbide mechanical seal device for slurry pumps, which includes a shaft sleeve connected to the pump shaft and a gland connected to the pump body. The shaft sleeve is fixed outside the pump shaft and penetrates through the hole of the gland. There are two sets of sealing mechanisms on the shaft sleeve: the first sealing mechanism and the second sealing mechanism, the first sealing mechanism is located in the pump chamber inside the gland, and the second sealing mechanism is located outside the gland; its characteristics In that: the first sealing mechanism includes the first moving ring, the first static ring, the first static ring seat, the first moving ring seat and a spring; the first moving ring, the first static ring, and the first static ring seat 1. The first moving ring seat is set outside the shaft sleeve, the first moving ring seat is fixed on the inner end of the shaft sleeve, the first moving ring is fixed on one end of the first moving ring seat, and the first static ring fixed at one end of the first static ring seat, a part of the first static ring seat is located in the through hole of the gland and the outer wall is sealed with the inner wall of the gland; a spring seat is provided in the through hole of the gland, and the The inner end of the spring seat is circumferentially linked with the first static ring seat, and the second sealing mechanism includes a second moving ring, a second static ring, a second static ring seat, a second moving ring seat, and a driving ring; The second moving ring, the second static ring, the second static ring seat and the driving ring are all sleeved outside the shaft sleeve, the second moving ring seat is fixed to the driving ring, the driving ring is fixed to the shaft sleeve, and the second moving ring seat is fixed to the driving ring. One end of the ring is fixed to the second moving ring seat, one end of the second static ring is fixed to the second static ring seat, the outer end of the spring seat is against one end of the spring, and the other end of the spring is connected to the second static ring seat. The ring seats are against each other; one end of the first stationary ring is closely attached to one end of the first moving ring by the action of a spring to form a first sealing surface; the other end of the second stationary ring is closely attached to the second moving ring by a spring One end forms the second sealing surface, and a closed cooling cavity is formed between the first sealing surface, the second sealing surface, the first moving ring seat, the second static ring seat, the spring seat and the shaft sleeve, and the gland There are flushing structure and cooling structure inside.

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, the outlet is located on the inner end surface of the gland and communicates with the pump chamber, and the flushing liquid enters from the inlet of the first liquid inlet channel , from the outlet into the pump chamber.

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.

The mechanical seal of the above structure has the following disadvantages:

1. The flushing structure cannot directly reach the sealing surface, because the sealing surface is located in the fluid medium, it can only take away the impurities accumulated outside the sealing surface, and it can only play a certain role on the static ring seat when cooling.

2. When encountering the sealing static ring made of graphite material, the flushing liquid will squeeze the outer wall of the sealing static ring. Since the sealing static ring is a ring, it is directly matched with the inner wall of the static ring seat hole, which will The static ring of the guide seal protrudes from the static ring seat and is squeezed inward by the pressure of the flushing liquid to be deformed, thus affecting the sealing surface against the dynamic seal ring.

3. The cooling structure only faces the sealing surface, and cannot cool the tail of the static sealing ring and the spring, and the cooling effect is too limited.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flushing liquid to avoid direct flushing of the sealing surface, which can reduce the pressure of the flushing liquid to squeeze the static seal ring, increase the support strength of the static seal ring and separate flushing and cooling into two parts. A high-parameter silicon carbide mechanical seal device with a separate structure.

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 moving ring seat, a sealing moving ring, a sealing static ring, a static ring seat and a shaft sleeve; One end is provided with a protruding ring, the moving ring seat is sleeved outside the shaft sleeve and a first annular groove is formed between the moving ring seat and the shaft sleeve, the bottom surface of the first annular groove is the inner end surface of the protruding ring; The moving sealing ring is located in the first annular groove and radially limited by a plurality of first pins; A step is provided in the central hole of the gland, and the step is provided with a plurality of installation holes with parallel axes, a part of the installation hole is provided with a spring, and the other part is provided with a second pin, and the springs and the second pin are alternately spaced Part; one end of the spring is against the first annular step of the outer wall of the static ring seat, and the other end is against the inner bottom surface of the mounting hole, and the spring pushes the static ring seat and the sealing static ring to make the end face of the sealing static ring and the sealing dynamic The end faces of the rings meet to form a sealing surface;

It is characterized in that: the front end of the static sealing ring protrudes from the static ring seat and the inner wall of the body of the static sealing ring located in the static ring seat is closely equipped with a support ring, and the gland is provided with a flushing liquid inlet, a flushing liquid Outlet, coolant inlet and coolant outlet; the flushing liquid is high pressure, enters from the flushing liquid inlet of the gland to flush the spring and sealing surface, and then flows out from the flushing liquid outlet while taking away heat; the cooling liquid comes from the coolant inlet of the gland It is formed by the outer wall of the shaft sleeve, the end face of the dynamic seal ring, the outer wall of the part where the static seal ring protrudes from the seat of the static ring, the inner wall and end face of the seat of the static ring, the inner wall of the gland, and the throttle ring at the end of the gland. The first cavity, then flows out from the coolant outlet and takes away the heat.

A first passage 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, part of the cooling liquid enters the fluid through the first passage, and the flushing fluid Take away the heat of the moving ring seat, the sealing moving ring, the sealing static ring, and the static ring seat.

The outlet of the flushing liquid faces the position where the spring is installed on the static ring seat, and the impurities and heat on the spring are taken away when the high-pressure flushing liquid flows through.

The outer end of the support ring is flush with the outer end surface of the static ring seat, and the inner end is against the inner end surface of the static ring seat.

The inner wall of the portion where the static sealing ring protrudes from the seat of the static ring and the inner side of the sealing surface are both part of the first cavity.

A first sealing ring and a gasket are arranged between the outer wall of the static ring seat and the inner wall to be covered, and the first sealing ring isolates the passage through which the flushing liquid passes and the passage through which the cooling liquid passes.

The choke ring is embedded in the stepped hole at the end of the gland, and the outer end is axially positioned by a positioning block, the positioning block is semicircular, and the outer wall of the sleeve is provided with a second annular groove. The bottom of the positioning block is embedded in the second annular groove and fixed with the gland.

After adopting the above structure, the present invention has the following advantages:

1. The flushing liquid is high pressure, enters from the flushing liquid inlet of the gland to flush the spring and sealing surface, and then flows out from the flushing liquid outlet while taking away heat; the flushing range is wider, and the pressure of the high-pressure flushing liquid can resist the pump body The pressure of the fluid can prevent the fluid from entering the sealing surface, so that the sealing surface is only in contact with the flushing liquid, which can better protect the sealing surface and effectively cool the sealing surface.

2. Since the front end of the static seal ring protrudes from the static ring seat and the inner wall of the body inside the static ring seat is tightly equipped with a support ring, due to the structural characteristics of the mechanical seal, the static seal ring is made of graphite material , the hardness is relatively poor, so after using the supporting ring, the strength of the sealing static ring can be guaranteed. Under the action of the high pressure of the flushing fluid on the static seal ring on one side of the sealing surface, the support ring provides the strength of the static seal ring to avoid deformation due to extrusion to the inside.

3. Since the coolant enters from the coolant inlet of the gland, the outer wall of the shaft sleeve, the end face of the seal dynamic ring, the outer wall of the part where the seal static ring protrudes from the static ring seat, the inner wall and end face of the static ring seat, the inner wall of the gland and The first cavity formed by the throttling ring at the end of the gland, then flows out from the coolant outlet and takes away the heat. When the coolant passes through, it can contact with many parts and realize heat exchange, thus taking away the heat. Heat, cooling effect is good.

As an improvement, a first passage 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, and part of the cooling liquid enters the fluid through the first passage , The flushing liquid takes away the heat of the moving ring seat, sealing moving ring, sealing static ring, and static ring seat, increases the contact area of the cooling liquid, and prevents the fluid from contacting the sealing surface.

As an improvement, the outlet of the flushing liquid faces the position where the spring is installed on the static ring seat, and when the high-pressure flushing liquid flows through, the impurities and heat on the spring are taken away, so as to avoid spring failure and increase reliability.

As an improvement, the outer end of the support ring is flush with the outer end surface of the static ring seat, and the inner end is against the inner end surface of the static ring seat, so that the protruding part is in contact with the sealing dynamic ring.

As an improvement, a first sealing ring and a gasket are provided between the outer wall of the static ring seat and the inner wall of the gland, and the first sealing ring isolates the channel through which the flushing liquid passes and the passage through which the cooling liquid passes, preventing the flushing liquid and Coolant mixed.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the mechanical seal of the present invention.

Fig. 2 is a schematic diagram of the assembly of the static seal ring and the static ring seat of the mechanical seal of the present invention.

Fig. 3 is a schematic cross-sectional view of the gland of the present invention.

As shown in the figure:

1. Gland, 1.1. Mounting hole, 2. Moving ring seat, 3. Sealing moving ring, 4. Sealing static ring, 5. Static ring seat, 6. Shaft sleeve, 6.1. Protruding ring, 7. Supporting ring, 8 , The first pin, 9, the spring, 10, the second pin, 11, the throttle ring, 12, the first sealing ring, 13, the gasket, 14, the positioning block.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 1-3, 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 static ring 4, a static ring seat 5 and a shaft sleeve 6; One end of the shaft sleeve 6 is provided with a convex ring 6.1, the moving ring seat 2 is set outside the shaft sleeve 6 and a first annular groove is formed between the moving ring seat 2 and the shaft sleeve 6, and the first annular recess The bottom surface of the groove is the inner end surface of the convex ring 6.1; the sealing dynamic ring 3 is located in the first annular groove and is radially limited by a plurality of first pins 8, so that the sealing dynamic ring 3 and the dynamic ring seat 2 are circumferentially positioned , rotate synchronously while rotating.

The static ring seat 5 is arranged in the center hole of the gland 1, the sealing static ring 4 is arranged in the static ring seat 5, and a step is arranged in the center hole of the gland 1, and the steps are provided with a plurality of A mounting hole 1.1 with a parallel axis, a part of the mounting hole 1.1 is installed with a spring 9, and the other part is provided with a second pin 10, and the spring 9 and the second pin 10 are alternately spaced apart.

One end of the spring 9 is against the first annular step of the outer wall of the static ring seat 5, and the other end is against the inner bottom surface of the installation hole 1.1. The spring 9 pushes the static ring seat 5 and the sealing static ring 4 to make the sealing static ring 4 The end face of the sealing ring 3 abuts against the end face to form a sealing surface.

The front end of the sealed static ring 4 stretches out from the static ring seat 5 and the inner wall of the body of the sealed static ring 4 located in the static ring seat 5 is tightly equipped with a support ring 7, because the sealed static ring 4 of this structure is made of graphite material It is made of silicon carbide, which is softer than ordinary silicon carbide. Under the pressure of high-pressure flushing fluid and being squeezed and deformed, the support ring 7 is added, which can increase the strength of the static seal ring 4, avoid inward deformation, and make the static seal The ring does not deform under the pressure of the flushing fluid.

As shown in Figures 1 and 3, the gland 1 is provided with a flushing liquid inlet A, a flushing liquid outlet B, a cooling liquid inlet C, and a cooling liquid outlet D; higher. A first passage is provided between the outer wall of the moving ring seat 2 and the inner wall of the gland 1 at the same end, the pressure of the flushing fluid is greater than the fluid pressure in the pump body, and part of the cooling liquid enters the fluid through the first passage, The flushing liquid takes away the heat of the moving ring seat 2, the sealing moving ring 3, the sealing static ring 4, and the static ring seat 5.

Enter from the flushing liquid inlet of the gland to flush the spring 9 and the sealing surface, and then flow out from the flushing liquid outlet while taking away heat. Specifically: the flushing liquid enters from the flushing liquid inlet A, most of it flows out from the flushing liquid outlet B, and another small part enters the pump body through the gap between the inner wall of the gland 1 and the outer wall of the movable ring seat 2, and the high-pressure flushing liquid It can prevent the medium in the pump body from entering the sealing surface.

The cooling liquid enters from the cooling liquid inlet of the gland, and the outer wall of the shaft sleeve 6, the end face of the sealing dynamic ring 3, the outer wall of the part where the sealing static ring 4 protrudes from the static ring seat 5, the inner wall and end face of the static ring seat 5, and the gland 1. The inner wall and the throttle ring 11 at the end of the gland form the first cavity, and then flow out from the coolant outlet and take away the heat. As shown in Figure 1, the end face of the sealing dynamic ring 3 is located at the leftmost side wall of the first cavity, the outer wall of the shaft sleeve 6 is the inner wall of the first cavity, and the throttle ring 11 is the most rightmost of the first cavity The side walls, the outer and inner surfaces of the first cavity are formed by the outer wall of the position where the sealing static ring 4 extends out of the static ring seat 5, the inner wall and end face of the static ring seat 5, and the inner wall of the gland 1.

The outlet of the flushing liquid faces the position where the spring 9 is installed on the static ring seat 5, and the impurities and heat on the spring 9 are taken away when the high-pressure flushing liquid flows through.

In addition, the flushing liquid enters from the flushing liquid inlet A, and then flows out from the flushing liquid outlet B along the outer wall of the static ring seat 5. At this time, the outside of the sealing surface is the space between the end face of the static ring seat 5 and the end face of the moving ring seat 2. The cavity will generate a certain negative pressure, and the impurities deposited on the sealing surface will be taken away by the flowing flushing liquid.

The outer end of the support ring 7 is flush with the outer end surface of the static ring seat 5 , and the inner end is offset against the inner end surface of the static ring seat 5 , so that the support ring 7 plays a maximum supporting role in sealing the static ring 4 .

The inner wall of the portion of the static sealing ring 4 protruding from the static ring seat 5 and the inner side of the sealing surface are both part of the first cavity.

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 gland 1, and the first sealing ring 12 isolates the channel through which the flushing liquid passes and the passage through which the cooling liquid passes.

The throttle ring 11 is embedded in the stepped hole at the end of the gland 1 and its outer end is axially positioned by a positioning block 14, the positioning block 14 is semicircular, and the outer wall of the sleeve 6 is provided with a second ring Groove, the bottom of the positioning block 14 is embedded in the second annular groove and fixed with the gland 1, the fixing method is bolt connection, which can realize detachable disassembly.

Claims (7)

1. A high-parameter silicon carbide mechanical seal device, including a gland (1), a moving ring seat (2), a sealing moving ring (3), a sealing static ring (4), a static ring seat (5) and a shaft sleeve ( 6); one end of the shaft sleeve (6) is provided with a protruding ring (6.1), the moving ring seat (2) is set outside the shaft sleeve (6) and the moving ring seat (2) and the shaft sleeve (6) A first annular groove is formed between them, and the bottom surface of the first annular groove is the inner end surface of the convex ring (6.1); the sealing dynamic ring (3) is located in the first annular groove and passed through a plurality of first pins (8) Radial limit; the static ring seat (5) is set in the center hole of the gland (1), the sealing static ring (4) is set in the static ring seat (5), and the gland (1) There is a step in the central hole, and the step is provided with a plurality of installation holes (1.1) parallel to the axis, a part of the installation hole (1.1) is installed with a spring (9), and the other part is provided with a second pin ( 10), the spring (9) and the second pin (10) are spaced alternately; one end of the spring (9) is against the first annular step on the outer wall of the static ring seat (5), and the other end is in contact with the mounting hole ( The inner bottom surface of 1.1) is against each other, and the spring (9) pushes the static ring seat (5) and the sealing static ring (4) so that the end face of the sealing static ring (4) and the end face of the sealing dynamic ring (3) are in contact to form a sealing surface ; It is characterized in that: the front end of the static sealing ring (4) protrudes from the static ring seat (5) and the inner wall of the body of the static sealing ring (4) located in the static ring seat (5) is tightly equipped with a support ring ( 7), the flushing liquid inlet, flushing liquid outlet, cooling liquid inlet and cooling liquid outlet of the gland (1); the flushing liquid is high pressure, and enters from the flushing liquid inlet of the gland to flush the spring (9) and the sealing surface Then it flows out from the flushing liquid outlet and takes away the heat; the cooling liquid enters from the cooling liquid inlet of the gland, and extends out of the static ring seat to the outer wall of the shaft sleeve (6), the end face of the sealing dynamic ring (3), and the sealing static ring (4). (5), the inner wall and end surface of the static ring seat (5), the inner wall of the gland (1) and the throttle ring (11) at the end of the gland form the first cavity, and then the cooling liquid The outlet flows out and takes away the heat. 2. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that a first channel is provided between the outer wall of the moving ring seat (2) and the inner wall of the gland (1) at the same end, The pressure of the flushing fluid is greater than the pressure of the fluid in the pump body, and part of the cooling fluid enters the fluid through the first channel, and the flushing fluid takes away the moving ring seat (2), the sealing moving ring (3), and the sealing static ring (4 ), the heat of the static ring seat (5). 3. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: the outlet of the flushing fluid faces the position where the spring (9) is installed on the static ring seat (5), and when the high-pressure flushing fluid flows through it will Impurities and heat on the spring (9) are carried away. 4. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: the outer end of the support ring (7) is flush with the outer end surface of the static ring seat (5), and the inner end is flush with the static ring seat (5). The inner end faces of the ring seat (5) are offset. 5. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: the inner wall of the part of the static ring (4) protruding from the seat of the static ring (5) and the inner side of the sealing surface are used as part of the first chamber. 6. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that a first sealing ring ( 12) and a gasket (13), the first sealing ring (12) isolates the passage through which the flushing liquid passes and the passage through which the cooling liquid passes. 7. A high-parameter silicon carbide mechanical seal device according to claim 1, characterized in that: the throttle ring (11) is embedded in the stepped hole at the end of the gland (1) and the outer end passes through the positioning block (14) Axial positioning, the positioning block (14) is semicircular, the outer wall of the bushing (6) is provided with a second annular groove, and the bottom of the positioning block (14) is embedded in the second annular groove In the groove and fixed with the gland (1).

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