CN108426035A - A kind of enhanced non-contact mechanical seal structure of liquid - Google Patents

Abstract

The invention relates to a liquid-enhanced non-contact mechanical seal structure, relating to the field of mechanical seals, including a shaft sleeve sleeved and fixed on a rotating shaft, a cavity arranged outside the shaft sleeve, and a compression sleeve sleeved on the shaft sleeve. Cover, the cavity is located between the shaft sleeve and the gland, the shaft sleeve is provided with a dynamic sealing ring sliding along the axial direction of the shaft sleeve, and the gland is provided with a static sealing ring that is tightly matched with the dynamic sealing ring. There is a first elastic member, and the end face of the dynamic seal ring facing the static seal ring or the end face of the static seal ring facing the dynamic seal ring is provided with a ring groove. The cavity includes a low-pressure chamber and a high-pressure chamber. The inlet and outlet of the clean low-pressure liquid are connected, and the shaft sleeve is provided with a secondary sealing structure. The rotation of the rotating shaft presses clean low-pressure liquid into the ring groove to separate the dynamic seal ring from the static seal ring, realize full liquid film lubrication and contact operation on the seal end face, reduce heat generation, and greatly increase the service life of the seal.

Description

A 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 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 a rotating shaft, a cavity arranged outside the shaft sleeve for relative rotation with the shaft sleeve during rotation, and sleeved on the shaft sleeve The gland remains relatively stationary with the cavity, the cavity is located between the shaft sleeve and the gland, the shaft sleeve is provided with a dynamic sealing ring sliding along the axial direction of the shaft sleeve, and the gland is provided with a The static seal ring with which the dynamic seal ring is sealed, the shaft sleeve is provided with a first elastic member that makes the dynamic seal ring always move towards the static seal ring side, and the dynamic seal ring faces the end face of the static seal ring or the static seal A ring groove is opened on the end surface of the ring facing the dynamic sealing ring, and the cavity includes a low-pressure cavity for containing clean low-pressure liquid formed between the outer diameter sides of the dynamic sealing ring and the static sealing ring and the gland, and the dynamic sealing ring and the static sealing ring. A high-pressure chamber for accommodating high-pressure liquid is formed between the inner diameter side of the static sealing ring and the shaft sleeve. The gland is provided with an inlet for feeding clean low-pressure liquid into the low-pressure chamber and a hole for the liquid in the low-pressure chamber to flow out. Outlet, on the end of the shaft sleeve away from the static sealing ring, a secondary sealing structure is provided between the shaft sleeve and the gland to prevent the high-pressure liquid from flowing out of the gland.

Implementing the above technical solution, after the rotating shaft rotates, the clean low-pressure liquid is passed into the inlet, and the clean low-pressure liquid enters the low-pressure cavity through the inlet at this time. The dynamic seal ring rotates at high speed to suck the clean low-pressure liquid into the ring groove and move the clean low-pressure liquid from the outer diameter side of the dynamic seal ring to the inner diameter side. A certain pressure is generated between the rings 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.

Further, the first elastic member includes a spring seat disposed in the cavity on the gland and a first spring disposed on the spring seat, one end of the first spring is connected to the spring seat, and the other end is connected to the dynamic sealing ring.

Implement the above technical solution, when the rotating shaft does not rotate, the first spring fixed on the spring seat will be stretched naturally under the action of elasticity, driving the dynamic sealing ring to approach the static sealing ring side, so that the dynamic sealing ring and the static sealing ring are tightly pressed Realize the mechanical seal structure; after the rotating shaft rotates, clean low-pressure liquid pours into the ring groove. At this time, the first spring is compressed by the pressure brought by the influx of clean low-pressure liquid, and the separation of the dynamic seal ring and the static seal ring is realized. At this time, the rotating shaft drives the dynamic sealing ring to rotate to realize non-contact sealing, and the dynamic sealing ring will not rub against the end face of the static sealing ring, so the effect of increasing the service life of the dynamic sealing ring can be achieved.

Further, a support ring for preventing the first spring from directly contacting the dynamic sealing ring is provided between the dynamic sealing ring and the first spring.

Implementing the above technical solution, the setting of the support ring makes the support surface between the first spring and the dynamic sealing ring larger, so that the first spring can push the dynamic sealing ring to move more stably, and it can also prevent the two from happening to a certain extent. mutual rotation, so as to achieve the effect of anti-rotation.

Further, the secondary sealing structure includes a moving ring arranged on the shaft sleeve and a static ring arranged on the gland for pressing against the moving ring, and a device is arranged between the spring seat and the moving ring to make the moving ring always A second elastic member that tends to move toward the stationary ring side.

Implementing the above technical solution, due to the setting of the second elastic member, the static ring is always pressed against the dynamic ring on the shaft sleeve and forms a mechanical seal state. At this time, after the clean low-pressure liquid flows into the low-pressure chamber, it is not easy to flow from the gap between the static ring and the dynamic ring. It flows to the outside world 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 seal between the dynamic ring and the static ring can be secondary Prevents high-pressure liquid from flowing out of the outer gland through the cavity.

Further, the second elastic member includes a second spring disposed on the side of the spring seat away from the first spring, one end of the second spring is connected to the spring seat, and the other end is connected to the moving ring.

Implementing the above technical solution, due to the elasticity of the second spring itself, after the second spring is connected to the moving ring, the second spring will press the moving ring against the static ring, so that a mechanical seal structure is realized between the moving ring and the static ring. So as to achieve the effect of sealing.

Further, a first sealing ring is provided on the shaft sleeve between the shaft sleeve and the dynamic sealing ring to prevent the high-pressure liquid from flowing into the first spring.

Implementing the above technical solution, the setting of the first sealing ring makes it difficult for the clean low-pressure liquid in the cavity 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, which not only achieves The effect of sealing, but also to a certain extent, makes the working environment good.

Further, a pump effect ring is arranged on the wall surface of the spring seat located in the low-pressure chamber.

Implementing the above technical solution, after installing the pump effect ring, when the rotating shaft rotates at a certain speed, the clean low-pressure liquid on one side of the bushing 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.

Further, the gland is provided with a static seal ring seat supporting the static seal ring, and a second seal ring is provided between the static seal ring seat and the static seal ring to prevent high-pressure liquid from entering the low-pressure chamber.

Implement the above technical solution, the setting of the static sealing ring seat can play the role of fixing the static sealing ring, and there will be a certain gap between the static sealing ring seat and the static sealing ring after setting, so in order to prevent the high-pressure liquid from entering the low-pressure chamber from the gap Among them, setting a second sealing ring between the static sealing ring seat and the static sealing ring can effectively prevent the high-pressure liquid from entering the low-pressure chamber, thereby achieving a sealing effect.

Further, both the moving ring and the static ring are located in the low-pressure chamber, and grooves are opened on the wall of the moving ring near the static ring side and located in the low-pressure chamber.

Implementing the above-mentioned technical scheme, when the clean low-pressure liquid circulates in the low-pressure cavity, since the moving ring is provided with a groove, the clean low-pressure liquid will quickly enter the groove and then flow out during the circulating flow, which will make the moving ring and the static The heat generated between the rings is easier to be taken away, so that the heat generated by the friction between the moving ring and the static ring can be removed in time, and the service life of the moving ring and the static ring is increased to a certain extent.

Further, the annular groove is set on the outer diameter side of the dynamic sealing ring and communicates with the low-pressure chamber or is arranged on the outer 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 ring groove is on the end surface of the dynamic seal ring and the direction from the radial outside to the radial inside is the same as the rotation direction of the dynamic seal ring. The ring groove is arranged on the end surface of the static seal ring from the radial outside to the radial inside. The direction of rotation is opposite to that of the dynamic seal ring.

Implementing the above technical solution, when the ring groove is arranged on the end surface 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 to the high-pressure chamber, thereby separating the end surfaces. The principle is to take advantage of the high viscosity of the liquid and its incompressible properties. Since the opening direction of the ring groove is the same as the rotation direction of the dynamic seal ring, the pressure of the low-pressure cleaning liquid being pressed into the ring groove is greater, so that the dynamic seal ring and the static seal ring can be squeezed apart more easily, thereby improving the sealing effect. Even better; 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.

In summary, the present invention has the following beneficial effects: the use of low-pressure fluid to enter the high-pressure chamber after being pressurized through the ring groove ensures that the dynamic seal ring and the static seal ring always work in clean fluid, and avoids particles in the medium in the high-pressure chamber Impurities or high-viscosity media 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

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of an annular groove according to an embodiment of the present invention.

Reference signs: 1, rotating shaft; 2, shaft sleeve; 21, dynamic sealing ring; 211, ring groove; 22, first sealing ring; 3, cavity; 31, low-pressure cavity; 32, high-pressure cavity; 4, pressure Cover; 41, static sealing ring; 411, static sealing ring seat; 412, second sealing ring; 42, inlet; 43, outlet; 5, first elastic member; 51, spring seat; 511, pump effect ring; 52, the first 1. spring; 53. support ring; 6. secondary sealing structure; 61. moving ring; 611. groove; 62. static ring; 63. second spring.

Detailed ways

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment one:

As shown in Figures 1 and 2, a liquid-enhanced non-contact mechanical seal structure includes a sleeve 2 sleeved and fixed on the rotating shaft 1, a cavity 3 arranged outside the sleeve 2, and a sleeve sleeved on the shaft The gland 4 on the sleeve 2, the cavity 3 rotates relative to the shaft sleeve 2 when rotating, the gland 4 and the cavity 3 remain relatively stationary, and the cavity 3 is located between the shaft sleeve 2 and the gland 4; the shaft sleeve 2 is provided with a dynamic sealing ring 21 sliding along the axial direction of the shaft sleeve 2, and a static sealing ring 41 is provided on the gland 4 to seal and cooperate with the dynamic sealing ring 21. The first elastic member 5 that tends to move toward the static seal ring 41 side, the end face of the dynamic seal ring 21 facing the static seal ring 41 is provided with an annular groove 211; The radial side communicates with the low-pressure chamber 31. The ring groove 211 is on the end face of the dynamic seal ring 21 and the direction from the radially outer side to the radially inner side is the same as the direction of rotation of the dynamic seal ring 21; The low-pressure chamber 31 for liquid and the high-pressure chamber 32 for containing high-pressure liquid, the space formed between the outer diameter side of the dynamic seal ring 21 and the static seal ring 41 and the gland 4 is the low-pressure chamber 31, the dynamic seal ring 21 and the static seal ring The space formed between the inner diameter side of the sealing ring 41 and the shaft sleeve 2 is the high-pressure chamber 32; Low, the clean low-pressure liquid in the low-pressure chamber 31 can be at normal pressure, so that the clean low-pressure liquid in the low-pressure chamber 31 is not easy to leak. The gland 4 is provided with an inlet 42 and an outlet 43 , the inlet 42 is used for feeding clean low-pressure liquid into the low-pressure chamber 31 , and the opening is used for the clean low-pressure liquid in the low-pressure chamber 31 to flow out.

After the rotating shaft 1 rotates, clean low-pressure liquid is passed into the inlet 42 , and the clean low-pressure liquid enters the low-pressure chamber 31 through the inlet 42 at this time. The dynamic sealing ring 21 rotates at high speed to suck the clean low-pressure liquid into the ring groove 211 and make the clean low-pressure liquid move from the outer diameter side to the inner diameter side of the dynamic sealing ring 21. Due to the incompressible characteristics of the liquid, the clean low-pressure liquid is in the dynamic sealing ring at this time. A certain pressure is generated between 21 and the static sealing ring 41 so that the static sealing ring 41 moves toward the side close to the first elastic member 5, the first elastic member 5 is compressed at this time, and the dynamic sealing ring 21 is separated from the static sealing ring 41. The low-pressure fluid is pressurized through the ring groove 211 and then enters the high-pressure chamber 32, which ensures that the dynamic seal ring 21 and the static seal ring 41 always work in clean fluid, and prevents the particle impurities or high-viscosity medium in the high-pressure chamber 32 from affecting the seal. run. 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, the operating power consumption and heat generation are reduced, thereby greatly increasing the service life of the sealing.

As shown in FIG. 1 , the first elastic member 5 includes a spring seat 51 disposed on the gland 4 in the cavity 3 and a first spring 52 disposed on the spring seat 51 , one end of the first spring 52 is connected to the spring seat 51 , The other end is connected with the dynamic sealing ring 21. A supporting ring 53 is arranged between the dynamic sealing ring 21 and the first spring 52. The setting of the supporting ring 53 makes the supporting surface between the first spring 52 and the dynamic sealing ring 21 larger, allowing the first spring 52 to push the dynamic sealing ring 21 It can be more stable when moving, and can also prevent the two from rotating each other to a certain extent, so as to achieve the effect of anti-rotation.

When the rotating shaft 1 is not rotating, the first spring 52 fixed on the spring seat 51 is naturally stretched under the action of elasticity, driving the dynamic sealing ring 21 to approach the static sealing ring 41 side, so that the dynamic sealing ring 21 and the static sealing ring 41 The mechanical seal structure is realized by tightening; after the rotating shaft 1 rotates, clean low-pressure liquid pours into the ring groove 211. At this time, the first spring 52 is compressed by the pressure brought by the influx of clean low-pressure liquid, and the dynamic sealing ring 21 and the static seal are realized. Separation of the sealing ring 41.

As shown in Figure 1, a secondary sealing structure 6 is provided between the shaft sleeve 2 and the gland 4 at the end away from the static sealing ring 41 on the shaft sleeve 2, and the secondary sealing structure 6 is used to prevent high-pressure liquid from flowing to the gland 4. external. The secondary sealing structure 6 includes a moving ring 61 arranged on the shaft sleeve 2 and a static ring 62 arranged on the gland 4 to be in close contact with the moving ring 61 , and a second elastic ring is arranged between the spring seat 51 and the moving ring 61 . The second elastic member makes the moving ring 61 always have a tendency to move towards the static ring 62 side; the second elastic member is the second spring 63 arranged on the spring seat 51 away from the first spring 52 side, and one end of the second spring 63 is connected to the side of the first spring 52. The spring seat 51 is connected, and the other end is connected with the moving ring 61 .

Due to the setting of the second spring 63, the static ring 62 is always pressed against the moving ring 61 on the shaft sleeve 2 and forms a mechanical seal state. At this time, after the clean low-pressure liquid flows into the low-pressure chamber 31, it is not easy to separate from the static ring 62 and the moving ring 61. Between the flow to the outside, to achieve the effect of allowing the clean low-pressure liquid to circulate normally in the low-pressure chamber 31; The seal between them can again prevent the high-pressure liquid from flowing out of the outer gland 4 through the cavity 3 .

As shown in FIG. 1 , both the moving ring 61 and the static ring 62 are located in the low-pressure chamber 31 , and a groove 611 is formed on the wall of the moving ring 61 near the static ring 62 and located in the low-pressure chamber 31 . When the clean low-pressure liquid circulates in the low-pressure chamber 31, since the moving ring 61 is provided with a groove 611, the clean low-pressure liquid will quickly enter the groove 611 and then flow out when circulating, so that the moving ring 61 and the static The heat generated between the rings 62 is more easily taken away, which increases the service life of the moving ring 61 and the stationary ring 62 to a certain extent.

As shown in Figure 1, a pump ring 511 is provided on the wall of the spring seat 51 located in the low pressure chamber 31. After the pump ring 511 is installed, when the rotating shaft 1 rotates at a certain speed, the clean low pressure on the side of the sleeve 2 will be The liquid is pumped to the other side of the pump effect ring 511 . The pump effect ring 511 is installed in the low-pressure chamber 31, so the clean low-pressure liquid located on one side of the pump effect ring 511 in the low-pressure chamber 31 will be pumped to the other side of the pump effect ring 511, thereby realizing the clean low-pressure liquid from the inlet 42 to the outlet 43 The rapid cycle of cleaning makes the cleaning effect of low-pressure liquid better and removes heat more quickly.

As shown in Figure 1, a first sealing ring 22 is arranged on the shaft sleeve 2 between the shaft sleeve 2 and the dynamic sealing ring 21. The first sealing ring 22 can effectively prevent the high-pressure liquid from flowing into the first spring 52, so that the first spring 52 will not be polluted by high-pressure liquid to increase its service life. The gland 4 is provided with a static seal ring seat 411 supporting the static seal ring 41, and a second seal ring 412 is provided between the static seal ring seat 411 and the static seal ring 41. The second seal ring 412 can effectively prevent the high pressure liquid from entering the low pressure liquid. In the cavity 31, the effect of sealing is better.

Embodiment two:

The main difference between this embodiment and Embodiment 1 is that: as shown in Figures 1 and 2, the annular groove 211 is arranged on the outer diameter side of the static sealing ring 41 and communicates with the low pressure chamber 6, and the annular groove 211 is arranged on the end surface of the static sealing ring 41 The direction from the radially outer side to the radially inner side is opposite to the direction of rotation 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 42. At this time, the clean low-pressure liquid circulates in the low-pressure chamber 31 and enters the ring groove 211 to connect the dynamic seal ring 21 and the static seal ring 41. Separate and enter into the high-pressure chamber 32 to ensure that the dynamic seal ring 21 and the static seal ring 41 always work in the clean fluid, avoiding the particle impurities or high-viscosity medium in the high-pressure chamber 32 from affecting the sealing operation. At this time, the rotating shaft 1 drives The dynamic sealing ring 21 is rotating, and because 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 operating power consumption and heat generation, thereby greatly increasing the sealing capacity. service life.

The above examples are only used to illustrate the technical solution of the present invention, but not to limit the protection scope of the invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on these embodiments, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art can still combine, add, delete, or make other adjustments to the features in the various embodiments of the present invention according to the situation without any conflicts. Thereby, other technical solutions that are different and do not deviate from the conception of the present invention in essence are obtained, and these technical solutions also belong to the protection scope of the present invention.

Claims (10)

1. A liquid-enhanced non-contact mechanical seal structure, characterized in that: it includes a sleeve (2) that is sleeved and fixed on the rotating shaft (1), and is arranged outside the sleeve (2) for contact with the shaft sleeve (2) when rotating. The shaft sleeve (2) produces a relatively rotating cavity (3) and a gland (4) that is sleeved on the shaft sleeve (2) and remains relatively stationary with the cavity (3), and the cavity (3) is located on the shaft sleeve (2) and the gland (4), a dynamic sealing ring (21) is provided on the sleeve (2) to slide along the axial direction of the sleeve (2), and the gland (4) is provided with A static seal ring (41) sealingly matched with the dynamic seal ring (21), the sleeve (2) is provided with a first elastic force that makes the dynamic seal ring (21) always move toward the static seal ring (41) side (5), the end face of the dynamic seal ring (21) facing the static seal ring (41) or the end face of the static seal ring (41) facing the dynamic seal ring (21) is provided with a ring groove (211), the cavity The body (3) includes a low-pressure chamber (31) for containing clean low-pressure liquid formed between the outer diameter side of the dynamic seal ring (21) and the static seal ring (41) and the gland (4), and the dynamic seal ring (21 ) and the inner diameter side of the static seal ring (41) and the shaft sleeve (2) form a high-pressure chamber (32) for containing high-pressure liquid, and the gland (4) is provided with a pressure chamber (31) for The inlet (42) leading to the clean low-pressure liquid and the outlet (43) for the liquid in the low-pressure chamber (31) to flow out, the end of the shaft sleeve (2) away from the static sealing ring (41) is on the shaft sleeve (2) A secondary sealing structure (6) for preventing high-pressure liquid from flowing out of the gland (4) is provided between the gland (4). 2. A liquid-enhanced non-contact mechanical seal structure according to claim 1, characterized in that: the first elastic member (5) includes a The spring seat (51) and the first spring (52) arranged on the spring seat (51), one end of the first spring (52) is connected with the spring seat (51), and the other end is connected with the dynamic sealing ring (21) . 3. A liquid-enhanced non-contact mechanical seal structure according to claim 2, characterized in that: between the dynamic seal ring (21) and the first spring (52), there is a device for preventing the first spring ( 52) The supporting ring (53) directly contacting with the dynamic sealing ring (21). 4. A liquid-enhanced non-contact mechanical seal structure according to claim 2, characterized in that: the secondary seal structure (6) includes a moving ring (61) and a The static ring (62) is arranged on the gland (4) and is used to be close to the moving ring (61), and there is a device between the spring seat (51) and the moving ring (61) to make the moving ring (61) always A second elastic member with a tendency to move toward the stationary ring (62) side. 5. A liquid-enhanced non-contact mechanical seal structure according to claim 4, characterized in that: the second elastic member comprises a first spring seat (51) on the side away from the first spring (52). Two springs (63), one end of the second spring (63) is connected to the spring seat (51), and the other end is connected to the moving ring (61). 6. A liquid-enhanced non-contact mechanical seal structure according to claim 2, characterized in that: the bushing (2) is located between the bushing (2) and the dynamic sealing ring (21). Prevent high-pressure liquid from flowing into the first sealing ring (22) in the first spring (52). 7. A liquid-enhanced non-contact mechanical seal structure according to claim 2, characterized in that: a pump effect ring (511) is provided on the wall surface of the spring seat (51) located in the low-pressure chamber (31) . 8. A liquid-enhanced non-contact mechanical seal structure according to claim 1, characterized in that: the gland (4) is provided with a static seal ring seat (411) supporting the static seal ring (41) A second sealing ring (412) is arranged between the static sealing ring seat (411) and the static sealing ring (41) to prevent high-pressure liquid from entering the low-pressure chamber (31). 9. A liquid-enhanced non-contact mechanical seal structure according to claim 4, characterized in that: both the moving ring (61) and the static ring (62) are located in the low-pressure chamber (31), the moving A groove (611) is opened on the wall surface of the ring (61) near the side of the static ring (62) and located in the low-pressure chamber (31). 10. A liquid-enhanced non-contact mechanical seal structure according to claim 1, characterized in that: the ring groove (211) is provided on the outer diameter side of the dynamic seal ring (21) and is connected to the low-pressure chamber (31 ) communicated or arranged on the outer diameter side of the static seal ring (41) and communicated with the low-pressure chamber (6). When the ring groove (211) is arranged on the end face of the dynamic seal ring (21), the ring groove (211) On the end surface of the dynamic seal ring (21) and from the radially outer side to the radially inner direction is the same as the rotation direction of the dynamic seal ring (21), when the ring groove (211) is arranged on the end surface of the static seal ring (41) The ring groove (211) is arranged on the end surface of the static sealing ring (41), and the direction from the radially outer side to the radially inner side is opposite to the direction of rotation of the dynamic sealing ring (21).