CN108468810A - The enhanced non-contact mechanical seal structure of liquid - Google Patents

Abstract

The present invention relates to a kind of enhanced non-contact mechanical seal structures of liquid, it is related to mechanical seal field, including being socketed and fixing axle sleeve on the rotary shaft, the rotary packing ring being arranged on axle sleeve, the internal gland being fixed on pump housing, the stationary seal ring being slidably arranged on internal gland and the first elastic component being arranged between stationary seal ring and internal gland, rotary packing ring is towards on the end face of stationary seal ring or stationary seal ring is towards offering annular groove on the end face of rotary packing ring, the high pressure chest for accommodating highly pressurised liquid is formed between rotary packing ring and the outside diameter and cavity of stationary seal ring, the low pressure chamber for accommodating low pressure liquid is formed between internal side diameter and axle sleeve, it is arranged with outer press cover outside axle sleeve, import and outlet are offered on outer press cover.Cleaning low pressure liquid indentation annular groove is made rotary packing ring be separated with stationary seal ring by rotary shaft rotation, realizes the full liquid-film lubrication of seal face and contact is run, reduce the generation of heat, to considerably increase the service life of sealing.

Description

Liquid enhanced non-contact mechanical seal structure

technical field

The invention relates to the field of mechanical seals, in particular to a liquid-enhanced non-contact mechanical seal structure.

Background technique

A mechanical seal is a shaft seal device for a fluid rotating machine, also known as a face seal. The traditional contact mechanical seal is under the action of the elastic force of the compensation mechanism to make it fully fit, so as to prevent the sealing medium from leaking from the sealing end faces. The friction pair composed of the dynamic/static ring is generally in the state of boundary friction or mixed friction. Under high-parameter conditions (high temperature, high pressure, high speed, etc.), the friction factor is large, the power consumption is high, the wear is serious, and the service life is short. and higher maintenance costs. With the rapid development of aerospace, nuclear power, natural gas transmission and petrochemical industries, higher requirements are put forward for mechanical seals, which promotes the progress of sealing technology.

However, the existing mechanical seals use medium fluid as end surface lubrication, and the leakage is from the high pressure side to the low pressure side. It requires clean sealing media and proper cooling to ensure long life of the seal. However, this kind of seal encounters problems when dealing with high viscosity, a large amount of sediment and other working conditions. A large amount of particles and impurities enter the sealing end face, causing severe wear on the end face, and the high viscosity fluid cannot form effective lubrication and heat dissipation on the end face, resulting in Seal life is severely lacking.

Contents of the invention

The purpose of the present invention is to provide a liquid-enhanced non-contact mechanical seal structure, which has the advantage of increasing the service life of the sealing end face.

Above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A liquid-enhanced non-contact mechanical seal structure, including a shaft sleeve sleeved and fixed on the rotating shaft, a dynamic seal ring set on the shaft sleeve and rotating simultaneously with the shaft sleeve, and an inner gland fixed on the pump cavity , A static seal ring arranged on the inner gland along the axial direction of the shaft sleeve to cooperate with the dynamic seal ring, and a static seal ring arranged between the static seal ring and the inner gland to make the static seal ring always have a direction toward the dynamic seal ring side The first elastic part of the movement trend, the end surface of the dynamic seal ring facing the static seal ring or the end surface of the static seal ring facing the dynamic seal ring is provided with a ring groove, the outer diameter side of the dynamic seal ring and the static seal ring and the A high-pressure chamber for containing high-pressure liquid is formed between the inner glands, and a low-pressure chamber for containing low-pressure liquid is formed between the inner diameter side of the dynamic seal ring and the static seal ring and the shaft sleeve, and the outer sleeve of the shaft sleeve is provided with a The outer gland matched with the inner gland, the outer gland is provided with an inlet for feeding clean low-pressure liquid into the low-pressure chamber and an outlet for the clean low-pressure liquid in the low-pressure chamber to flow out, and the shaft sleeve is far away from the moving The sealing ring end is provided with a safety sealing structure between the shaft sleeve and the outer gland for preventing the clean low-pressure liquid in the low-pressure chamber from flowing out from between the shaft sleeve and the outer gland.

Through the above technical scheme, after the rotating shaft rotates, clean low-pressure liquid is passed into the inlet, and the clean low-pressure liquid will enter the low-pressure chamber under the action of gravity and flow to the seal between the dynamic seal ring and the static seal ring, and the set The safety sealing structure can keep the clean low-pressure liquid normally in the low-pressure chamber, and it is not easy to flow out from between the shaft sleeve and the outer gland, achieving the effect of sealing. The high-speed rotation of the dynamic seal ring sucks the clean low-pressure liquid into the ring groove and moves the low-pressure liquid from the inner diameter side to the outer diameter side of the dynamic seal ring. A certain pressure is generated between them so that the static sealing ring moves toward the side close to the first elastic member, the first elastic member is compressed at this time, and the dynamic sealing ring is separated from the static sealing ring. The low-pressure fluid is pressurized through the ring groove and then enters the high-pressure chamber, which ensures that the dynamic and static seal rings always work in clean fluid, and prevents the particle impurities or high-viscosity medium in the high-pressure chamber from affecting the sealing operation. Since the dynamic sealing ring is separated from the static sealing ring, the full liquid film lubrication and non-contact operation of the sealing end face are realized, which reduces the operating power consumption and heat generation, thereby greatly increasing the service life of the seal. After the rotating shaft stops rotating, the static sealing ring will be tightly attached to the dynamic sealing ring again under the elastic force of the first elastic member to form a sealed state.

Preferably, the safety sealing structure includes a moving ring arranged on the shaft sleeve and a static ring arranged on the outer gland for pressing against the moving ring, and a device is provided between the cavity and the static ring to make the static ring always The second elastic member has a tendency to move toward the moving ring side.

Through the above technical solution, due to the setting of the second elastic member, the static ring will always be pressed against the dynamic ring on the shaft sleeve to form a mechanical seal state. At this time, the clean low-pressure liquid is not easy to flow out from between the static ring and the dynamic ring. , but will only circulate in the low-pressure chamber to achieve the effect of allowing the clean low-pressure liquid to circulate normally in the low-pressure chamber; and if the sealing effect between the dynamic seal ring and the static seal ring fails, the gap between the dynamic ring and the static ring will The seal can prevent the high-pressure liquid from flowing out of the outer gland through the low-pressure chamber.

Preferably, a cooling slope is provided on the end surface where the moving ring and the stationary ring fit together.

Through the above technical scheme, since the rotating shaft rotates at high speed, the friction between the moving ring and the static ring will generate heat. Therefore, a cooling slope is set on the side of the moving ring and the static ring away from the shaft sleeve, and the clean low-pressure liquid is circulating. During the process, it will flow to the cooling slope, so as to take away part of the heat generated by friction, and accelerate the cooling between the moving ring and the static ring, so as to achieve the effect of cooling the friction end surface.

Preferably, the first elastic member is located in the low-pressure chamber, a first push ring is provided between the static sealing ring and the first elastic member, and a push ring for preventing high pressure is provided between the inner gland and the first push ring. The liquid in the cavity contacts the first sealing ring with the first elastic member.

Through the above technical solution, under the action of the elastic force of the first elastic member, the first push ring moves toward the side close to the dynamic sealing ring, thereby pressing the static sealing ring and the dynamic sealing ring to form a mechanical sealing structure. And the setting of the first sealing ring between the inner gland and the first push ring can make it difficult for the high-pressure liquid in the high-pressure chamber to enter the low-pressure chamber, so that the first elastic member is not easily affected by the high-pressure liquid and thus keeps relatively high pressure. Good elastic state effect.

Preferably, a high-pressure sealing ring for preventing liquid in the high-pressure chamber from entering between the sleeve and the rotating shaft is provided between the sleeve and the rotating shaft.

Through the above technical scheme, the setting of the high-pressure sealing ring can prevent the high-pressure liquid in the high-pressure chamber from entering between the shaft sleeve and the rotating shaft to a certain extent, so that the high-pressure liquid will not affect the rotation of the rotating shaft and the shaft sleeve, so that the rotation The shaft can normally drive the shaft sleeve to rotate.

Preferably, a second sealing ring is provided between the low-pressure chamber and the inner gland, and between the inner gland and the outer gland.

Through the above technical scheme, the setting of the second sealing ring makes it difficult for the clean low-pressure liquid in the low-pressure chamber to flow to the outside from the gap between the cavity and the inner gland, and the gap between the inner gland and the outer gland, not only To achieve the effect of sealing, but also to a certain extent, make the working environment good.

Preferably, a spiral pumping structure for pumping the clean low-pressure liquid flowing in from the inlet to the outlet is provided on the wall of the shaft sleeve located in the low-pressure chamber, and the spiral pumping structure includes a pumping ring arranged on the shaft sleeve.

Through the above technical solution, after the pump effect ring is installed, when the rotating shaft rotates at a certain speed, the liquid on one side of the shaft sleeve will be pumped to the other side of the pump effect ring. The pump effect ring is installed in the low-pressure chamber, so the clean low-pressure liquid on one side of the pump effect ring in the low-pressure chamber will be pumped to the other side of the pump effect ring, so as to realize the rapid circulation of the clean low-pressure liquid from the inlet to the outlet, so that the clean low-pressure Liquid cleaning works better.

Preferably, the first elastic member includes a first spring disposed in the low-pressure chamber and located on the inner gland, the inner gland is provided with an inner spring seat connected to the first spring, and the first push ring One end is provided with a first support ring connected to the first spring, one end of the first spring is connected to the inner spring seat, and the other end is connected to the first support ring.

Through the above technical solution, when the rotating shaft does not rotate, the first spring fixed on the inner spring seat is stretched toward the side close to the first push ring under the action of elasticity, and the first spring drives the first push ring and the first push ring during the stretching process. The static sealing ring approaches the dynamic sealing ring side. Since the first support ring is provided, the support surface between the first spring and the first push ring becomes larger, which can be more stable when the first spring pushes the first push ring to move, and can also prevent both of them to a certain extent. Generate mutual rotation, so as to achieve the effect of anti-rotation.

Preferably, the outer gland is provided with a stationary ring seat for fixing the stationary ring, the second elastic member includes a second spring arranged between the stationary ring seat and the stationary ring, and the stationary ring is close to the second spring A second support ring connected to the second spring is arranged at the end, and one end of the second spring is connected to the static ring seat, and the other end is connected to the second support ring.

Through the above technical solution, when the rotating shaft does not rotate, the second spring fixed on the static ring seat is stretched toward the side close to the second push ring under the action of elasticity, and the second spring drives the static ring to the moving ring during the stretching process. Since the second support ring is provided, the second spring will not be in direct contact with the stationary ring, so the elastic force generated by the second spring will not damage the stationary ring, so that the service life of the stationary ring will be longer.

Preferably, the annular groove is arranged on the inner diameter side of the dynamic sealing ring and communicates with the low-pressure chamber or is arranged on the inner diameter side of the static sealing ring and communicates with the low-pressure chamber. When the annular groove is arranged on the end surface of the dynamic sealing ring, the The direction of the ring groove from the radially inner side to the radially outer side on the end face of the dynamic seal ring is the same as the rotation direction of the dynamic seal ring. When the ring groove is set on the end face of the static seal ring, the said ring groove The direction from the radially inner side to the radially outer side is opposite to the direction of rotation of the dynamic sealing ring.

Through the above technical solution, when the ring groove is arranged on the end face of the dynamic sealing ring, the rotating shaft rotates, and the ring groove rotates together, compressing the low-pressure cleaning fluid entering the groove to high pressure and flowing toward the high-pressure chamber, thereby separating the end faces. The principle is to take advantage of the high viscosity of the liquid and its incompressible properties. Similarly, when the ring groove is arranged on the end surface of the static sealing ring, the principle is consistent with the above-mentioned principle, and will not be repeated here. After being set in this way, the dynamic sealing ring and the static sealing ring can be separated under the pressure of the liquid and the sealing effect can still be achieved. Because in this state, the dynamic sealing ring and the static sealing ring are separated, so that there is no contact between the two, which reduces the operating power consumption and heat generation, thereby greatly increasing the service life of the seal.

To sum up, compared with the prior art, the beneficial effect of the present invention is that the low-pressure fluid is pressurized through the ring groove and then enters the high-pressure chamber, which ensures that the dynamic seal ring and the static seal ring always work in the clean fluid, avoiding the high-pressure chamber Particle impurities in the medium medium or high viscosity medium affect the sealing operation. Since the dynamic sealing ring is separated from the static sealing ring, the full liquid film lubrication and non-contact operation of the sealing end face are realized, which reduces the operating power consumption and heat generation, thereby greatly increasing the service life of the seal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of embodiment;

Fig. 2 is a schematic structural view of the end face of the ring groove of the embodiment.

Reference signs: 1, rotating shaft; 2, shaft sleeve; 21, dynamic sealing ring; 211, ring groove; 22, high pressure sealing ring; 3, pump effect ring; 4, inner gland; 41, static sealing ring; 42, The first spring; 43, inner spring seat; 5, high pressure chamber; 6, low pressure chamber; 7, outer gland; 71, inlet; 72, outlet; 73, static ring seat; 8, safety sealing structure; ; 82, static ring; 821, second spring; 822, second support ring; 9, cooling slope; lock up.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Embodiment one:

As shown in Figures 1 and 2, a liquid-enhanced non-contact mechanical seal structure includes a sleeve 2 that is sleeved and fixed on the rotating shaft 1, an inner gland 4 fixed on the pump cavity, and the sleeve 2. One end is provided with a dynamic sealing ring 21, and the inner gland 4 is provided with a static sealing ring 41 sliding axially along the shaft sleeve 2. The static sealing ring 41 is used for sealing cooperation with the dynamic sealing ring 21; the static sealing ring 41 is in contact with the internal pressure A first elastic member is arranged between the covers 4, and the first elastic member makes the static sealing ring 41 always have a tendency to move toward the moving sealing ring 21 side. The end surface of the dynamic seal ring 21 facing the static seal ring 41 or the end surface of the static seal ring 41 facing the dynamic seal ring 21 is provided with an annular groove 211; in this embodiment, the annular groove 211 is arranged on the inner diameter side of the dynamic seal ring 21 and It communicates with the low-pressure chamber 6, and the direction of the ring groove 211 from the radially inner side to the radially outer side on the end face of the dynamic sealing ring 21 is the same as the rotation direction of the dynamic sealing ring 21; the outer diameter side of the dynamic sealing ring 21 and the static sealing ring 41 A high-pressure chamber 5 for containing high-pressure liquid is formed between the inner gland 4 and the inner diameter side of the dynamic seal ring 21 and the static seal ring 41 and the shaft sleeve 2 to form a low-pressure chamber 6 for containing clean low-pressure liquid. Ring 21 is communicated with low-pressure chamber 6; In the present embodiment, the pressure of the clean low-pressure liquid in low-pressure chamber 6 is lower relative to the pressure of high-pressure liquid in high-pressure chamber 5, and the clean low-pressure liquid in low-pressure chamber 6 can be normal pressure, so that the clean low-pressure liquid in the low-pressure chamber 6 is not easy to leak. The shaft sleeve 2 is provided with an outer gland 7 for cooperating with the inner gland 4. The outer gland 7 is provided with an inlet 71 and an outlet 72. The inlet 71 is used to feed clean low-pressure liquid into the low-pressure chamber 6, and the outlet 72 is used for For the clean low-pressure liquid in the low-pressure chamber 6 to flow out; in order to make the clean low-pressure liquid in the low-pressure chamber 6 circulate in the low-pressure chamber 6 more quickly, the wall of the shaft sleeve 2 located in the low-pressure chamber 6 is provided with an inlet 71 The incoming clean low pressure liquid is pumped to the pumping ring 3 at the outlet 72 . The end face of the moving ring 81 and the static ring 82 is provided with a cooling slope 9. When the clean low-pressure liquid entering the inlet 71 circulates in the low-pressure chamber 6, the setting of the cooling slope 9 makes the circulating clean low-pressure liquid easier to carry. The heat generated by the relative rotation between the moving ring 81 and the stationary ring 82 achieves the effect of cooling.

The pressure in the high-pressure chamber 5 is higher than the pressure in the low-pressure chamber 6 , so the high-pressure liquid in the high-pressure chamber 5 tends to flow into the low-pressure chamber 6 . At this time, the low-pressure fluid enters the high-pressure chamber 5 after being pressurized through the ring groove 211, which ensures that the dynamic seal ring 21 and the static seal ring 41 are always working in clean fluid, and avoids the influence of particle impurities or high-viscosity medium in the high-pressure chamber 5 Sealed operation, so a relatively stable state is formed, so that the high-pressure liquid in the high-pressure chamber 5 is not easy to flow into the low-pressure chamber 6 . At this time, the rotating shaft 1 drives the dynamic sealing ring 21 to rotate. Since the dynamic sealing ring 21 is separated from the static sealing ring 41, the full liquid film lubrication and non-contact operation of the sealing end face are realized, which reduces the power consumption and heat loss of the operation. Produced, thereby greatly increasing the service life of the seal.

As shown in Figure 1, the first elastic member is a first spring 42 disposed in the low-pressure chamber 6 on the inner gland 4, and the inner gland 4 is provided with an inner spring seat 43 connected to the first spring 42, the first One end of the push ring 10 is provided with a first support ring 101 connected to the first spring 42 ; one end of the first spring 42 is connected to the inner spring seat 43 , and the other end is connected to the first support ring 101 .

As shown in FIG. 1 , a first push ring 10 is disposed between the static seal ring 41 and the first spring 42 , and a first seal ring 11 is disposed between the inner gland 4 and the first push ring 10 . The first sealing ring 11 is used to prevent the high-pressure liquid in the high-pressure chamber 5 from contacting the first spring 42 , so that the first spring 42 will not be affected by the high-pressure liquid, thereby increasing the service life of the first spring 42 .

When the rotating shaft 1 rotates, the dynamic sealing ring 21 rotates at a high speed to suck the clean low-pressure liquid into the ring groove 211 and move the low-pressure liquid from the inner diameter side to the outer diameter side of the dynamic sealing ring 21. The liquid generates a certain pressure between the dynamic seal ring 21 and the static seal ring 41 so that the static seal ring 41 moves to the side close to the first spring 42, and the first spring 42 is compressed at this time, and the dynamic seal ring 21 and the static seal ring 41 Detachment, so that the clean low-pressure liquid enters the high-pressure chamber 5, ensuring that the dynamic seal ring 21 and the static seal ring 41 always work in the clean fluid and maintain a non-contact seal, and also avoid particle impurities or high viscosity of the medium in the high-pressure chamber 5 The medium affects the operation of the seal. When the rotating shaft 1 does not rotate, the first spring 42 fixed on the inner spring seat 43 is stretched toward the side close to the first push ring 10 under the action of elasticity, and the first spring 42 drives the first push ring during the stretching process. 10 and the static seal ring 41 approach the dynamic seal ring 21 side, so that the support surface between the first spring 42 and the first push ring 10 becomes larger, and the first spring 42 can be more stable when pushing the first push ring 10 to move, And it can also prevent the two from rotating mutually to a certain extent, so as to achieve the effect of anti-rotation.

As shown in Figure 1, the end of the shaft sleeve 2 away from the dynamic seal ring 21 is provided with a safety sealing structure 8 between the shaft sleeve 2 and the outer gland 7. The safety sealing structure 8 is used to prevent the clean low-pressure liquid in the low-pressure chamber 6 from flowing from the shaft Outflow between cover 2 and outer gland 7. The safety sealing structure 8 includes a moving ring 81 arranged on the shaft sleeve 2 and a static ring 82 arranged on the outer gland 7 for being in close contact with the moving ring 81, and the outer gland 7 is provided with a static ring for fixing the static ring 82 Seat 73. A second spring 821 is disposed between the static ring seat 73 and the static ring 82 , and the second spring 821 makes the static ring 82 always have a tendency to move toward the moving ring 81 . The static ring 82 is provided with a second support ring 822 connected to the second spring 821 near the end of the second spring 821 , one end of the second spring 821 is connected to the static ring seat 73 , and the other end is connected to the second support ring 822 .

If the mechanical seal structure between the dynamic seal ring 21 and the static seal ring 41 fails after long-term use, the seal between the dynamic ring 81 and the static ring 82 can achieve the effect of secondary sealing, so that the liquid in the high pressure chamber 5 It is still not easy to flow to the outside world. The sealing structure between the dynamic ring 81 and the static ring 82 is similar to the sealing structure between the dynamic sealing ring 21 and the static sealing ring 41 , so it will not be repeated here.

As shown in Figure 1, a high-pressure sealing ring 22 is provided between the shaft sleeve 2 and the rotating shaft 1. The high-pressure sealing ring 22 is located at the end of the shaft sleeve 2 close to the high-pressure chamber 5. The high-pressure sealing ring 22 can make the gap between the shaft sleeve 2 and the rotating shaft 1 The sealing effect between them is better; between the low-pressure chamber 6 and the inner gland 4, and between the inner gland 4 and the outer gland 7, a second sealing ring 12 is arranged, and the second sealing ring 12 can make the pressure in the low-pressure chamber 6 The clean low-pressure liquid is not easy to leak, thereby reducing the pollution of the clean low-pressure liquid to the outside world to a certain extent.

Embodiment two:

The main difference between this embodiment and Embodiment 1 is: as shown in Figures 1 and 2, the annular groove 211 is arranged on the inner diameter side of the static sealing ring 41 and communicates with the low pressure chamber 6, and the annular groove 211 is on the end surface of the static sealing ring 41 The direction from the radially inner side to the radially outer side is opposite to the rotation direction of the dynamic sealing ring 21 .

Specific working process: After the rotating shaft 1 is started to drive the shaft sleeve 2 to rotate, a clean low-pressure liquid is introduced into the inlet 71. At this time, the clean low-pressure liquid circulates in the low-pressure chamber 6 and enters the ring groove 211, and the dynamic sealing ring 21 and the The static sealing ring 41 separates and enters the high-pressure chamber 5, ensuring that the dynamic sealing ring 21 and the static sealing ring 41 always work in a clean fluid, and avoiding the particle impurities or high-viscosity medium in the high-pressure chamber 5 from affecting the sealing operation. The rotating shaft 1 drives the dynamic sealing ring 21 to rotate. Since the dynamic sealing ring 21 is separated from the static sealing ring 41, the full liquid film lubrication and non-contact operation of the sealing end face are realized, which reduces the power consumption and heat generation of the operation, thereby Greatly increased the service life of the seal.

This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contribution as required after reading this specification, but as long as they are within the rights of the present invention All claims are protected by patent law.

The above descriptions are only exemplary implementations of the present invention, and are not intended to limit the protection scope of the present invention, which is determined by the appended claims.

Claims (10)

1. a kind of enhanced non-contact mechanical seal structure of liquid, it is characterised in that：Including being socketed and being fixed on rotary shaft (1) On axle sleeve (2), be arranged on axle sleeve (2) with axle sleeve (2) and meanwhile rotation rotary packing ring (21), be fixed on it is interior on pump housing Gland (4), slide axially the stationary seal ring being arranged on internal gland (4) for coordinating with rotary packing ring (21) along axle sleeve (2) (41) and it is arranged between stationary seal ring (41) and internal gland (4) for so that stationary seal ring (41) has always to rotary packing ring (21) the first elastic component of side movement tendency, the rotary packing ring (21) is towards on the end face of stationary seal ring (41) or stationary seal ring (41) towards offering annular groove (211), the rotary packing ring (21) and stationary seal ring (41) on the end face of rotary packing ring (21) The high pressure chest (5) for accommodating highly pressurised liquid, the rotary packing ring (21) and static seal are formed between outside diameter and internal gland (4) The low pressure chamber (6) for accommodating low pressure liquid is formed between the internal side diameter and axle sleeve (2) of ring (41), is arranged outside the axle sleeve (2) It is useful for the outer press cover (7) with internal gland (4) cooperation, is offered on the outer press cover (7) for being passed through cleaning to low pressure chamber (6) The import (71) of low pressure liquid and the outlet (72) for being flowed out for the cleaning low pressure liquid in low pressure chamber (6), the axle sleeve (2) It is provided between axle sleeve (2) and outer press cover (7) for preventing the cleaning low pressure in low pressure chamber (6) far from rotary packing ring (21) end The safety seal structure (8) that liquid flows out between axle sleeve (2) and outer press cover (7).

2. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：The safety is close Seal structure (8) include be arranged rotating ring (81) on axle sleeve (2) be arranged on outer press cover (7) for rotating ring (81) tight against Stationary ring (82) is provided between the outer press cover (7) and stationary ring (82) for so that stationary ring (82) has always to rotating ring (81) Second elastic component of side movement tendency.

3. the enhanced non-contact mechanical seal structure of liquid according to claim 2, it is characterised in that：The rotating ring (81) it is provided with cooling inclined-plane (9) on the end face to fit with stationary ring (82).

4. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：First bullet Property part be located in low pressure chamber (6), be provided with the first throw-out collar (10) between the stationary seal ring (41) and the first elastic component, it is described in The first sealing ring for preventing the highly pressurised liquid in high pressure chest (5) from leaking is provided between gland (4) and the first throw-out collar (10) (11)。

5. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：The axle sleeve (2) be provided between rotary shaft (1) for prevent the highly pressurised liquid in high pressure chest (5) enter axle sleeve (2) and rotary shaft (1) it Between high-pressure seal ring (22).

6. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：The low pressure chamber (6) it is both provided with the second sealing ring (12) between internal gland (4), between internal gland (4) and outer press cover (7).

7. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：The axle sleeve (2) wall surface being located in low pressure chamber (6) is equipped with import（71）The cleaning low pressure liquid of inflow is pumped to outlet (72) Spiral pump structure, the spiral pump structure include the pump efficiency ring (3) being arranged on axle sleeve (2).

8. the enhanced non-contact mechanical seal structure of liquid according to claim 4, it is characterised in that：First bullet Property part include first spring (42) of the setting in the low pressure chamber (6) on internal gland (4), be provided on the internal gland (4) One end of the inside spring base (43) being connect with the first spring (42), first throw-out collar (10) is provided with and the first spring (42) The first support ring (101) of connection, described first spring (42) one end connect with inside spring base (43), the other end and first Pushing out ring (101) connects.

9. the enhanced non-contact mechanical seal structure of liquid according to claim 2, it is characterised in that：The outer press cover (7) be provided with the stationary seat (73) for fixing stationary ring (82) on, second elastic component include setting stationary seat (73) with Second spring (821) between stationary ring (82), the stationary ring (82) is provided with close to second spring (821) end and second spring (821) the second support ring (822) connected, described second spring (821) one end connect with stationary seat (73), the other end and second Support ring (822) connects.

10. the enhanced non-contact mechanical seal structure of liquid according to claim 1, it is characterised in that：The annular groove (211) internal side diameter in rotary packing ring (21) is set and the internal side diameter in stationary seal ring (41) is communicated or be arranged with low pressure chamber (6) And communicated with low pressure chamber (6), when annular groove (211) is set on the end face of rotary packing ring (21), the annular groove (211) is dynamic close It is identical as the direction of rotation of rotary packing ring (21) by the trend of radially inner side to radial outside on the end face of seal ring (21), work as annular groove (211) when being set on the end face of stationary seal ring (41), the annular groove (211) is inside by diameter on the end face of stationary seal ring (41) The trend of side to radial outside is opposite with the direction of rotation of rotary packing ring (21).