CN114294257A - Static pressure isolation sealing assembly and method for double-corrugated-pipe type turbo pump - Google Patents
Static pressure isolation sealing assembly and method for double-corrugated-pipe type turbo pump Download PDFInfo
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- CN114294257A CN114294257A CN202210047557.5A CN202210047557A CN114294257A CN 114294257 A CN114294257 A CN 114294257A CN 202210047557 A CN202210047557 A CN 202210047557A CN 114294257 A CN114294257 A CN 114294257A
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- 238000007789 sealing Methods 0.000 title claims abstract description 208
- 230000003068 static effect Effects 0.000 title claims abstract description 127
- 238000002955 isolation Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005461 lubrication Methods 0.000 claims abstract description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 27
- 230000009977 dual effect Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 abstract description 3
- 238000013016 damping Methods 0.000 description 12
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004021 metal welding Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention provides a static pressure isolation sealing component for a double-corrugated-pipe type turbo pump and a method. The assembly includes: the sealing device comprises a sealing shell, an outer sealing base, an inner sealing base, an outer corrugated pipe, an inner corrugated pipe, a static ring seat, a static ring and a moving ring; the static ring is provided with a static ring sealing end surface provided with an annular groove and an air hole; the inner layer corrugated pipe is sleeved on the inner side of the outer layer corrugated pipe, and an isolation air passage is formed in the middle of the inner layer corrugated pipe; the movable ring is provided with a sealing end face, the sealing end face of the movable ring is opposite to the sealing end face of the static ring, and the orthographic projection of the sealing end face of the movable ring on the sealing end face of the static ring shields all the annular grooves; keep apart gas and act on the quiet ring seal terminal surface of quiet ring and the rotating ring seal terminal surface of rotating ring through gas passage, make it open and form the air film, the air film plays the lubrication action on the one hand, and on the other hand keeps apart gas and leads to the realization through the seal terminal surface and seal the isolation of both sides medium to both ends. The invention can reduce the size of the isolation seal and simultaneously better improve the service life and performance of the isolation seal of the turbine pump.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a static pressure isolation sealing assembly and method for a double-corrugated-pipe type turbo pump.
Background
In the field of engineering machinery, the sealing requirement is extremely high, the use scenes are very rich, and meanwhile, the precision requirement of the machinery is higher and higher, so that the performance requirement of the sealing is higher and higher, particularly for a turbo pump, the working condition is harsh, and the sealing index is harsh. Therefore, how to ensure the isolation performance and the size optimization of the turbine pump seal is a problem to be solved for those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a static pressure type isolation sealing assembly and method for a double-corrugated-pipe type turbine pump, which are used for ensuring the isolation sealing performance of the turbine pump.
In one aspect, an embodiment of the present invention provides a static pressure isolation seal assembly for a dual corrugated pipe type turbo pump, where the static pressure isolation seal assembly is used for a turbo pump, and the static pressure isolation seal assembly for the dual corrugated pipe type turbo pump includes: the sealing device comprises a sealing shell, an outer-layer sealing base, an inner-layer sealing base, an outer-layer corrugated pipe, an inner-layer corrugated pipe, a static ring seat, a static ring and a dynamic ring; wherein:
the sealing shell is fixedly connected with the bottom of the outer-layer sealing base, the outer-layer sealing base is fixedly connected with the bottom of the inner-layer sealing base, and the outer-layer sealing base is provided with a raised edge which is fixedly connected with the lower end of the corrugated pipe; the outer-layer corrugated pipe is sleeved on the outer side of the inner-layer corrugated pipe, and an isolation air passage is formed in the middle of the outer-layer corrugated pipe after the outer-layer corrugated pipe is sleeved; the outer layer sealing base is provided with a first air inlet through hole, one end of the outer layer sealing base is communicated with an air inlet channel of the outer layer cavity, and the other end of the outer layer sealing base is communicated with the isolating air passage; the static ring seat is provided with a static ring space and is provided with a second air inlet through hole; an air inlet groove is reserved on the surface of the inner side of the static ring space; the static ring seat is fixedly connected with the upper ends of the inner-layer corrugated pipe and the outer-layer corrugated pipe;
the static ring is arranged in the static ring space of the static ring seat, and the static ring is tightly connected with the static ring seat; one end of the static ring is provided with a static ring sealing end face, and the static ring sealing end face is provided with a pressure stabilizing groove; an air hole is formed below the pressure stabilizing groove; the static pressure groove is an annular groove belt, and the radial positions of a lower air hole of the pressure stabilizing groove and an air groove in the static ring space are the same; one end of the movable ring is provided with a movable ring sealing end face, and the static ring sealing end face is opposite to the movable ring sealing end face;
the sealing shell, the outer-layer sealing base, the inner-layer sealing base, the outer-layer corrugated pipe, the inner-layer corrugated pipe, the static ring base and the static ring jointly form a static ring assembly, the static ring assembly is fixed to a working cavity, the dynamic ring is fixed to a transmission shaft and clamped between the transmission shaft and a positioning shaft sleeve, a sealing end face is arranged on the dynamic ring, a sealing end face is arranged on the static ring, the sealing end face of the dynamic ring is in contact with the sealing end face of the static ring to form a sealing face, and a pressure stabilizing groove and an air hole are formed in the static ring;
the outer layer sealing base is provided with a first air inlet through hole, one end of the outer layer sealing base is communicated with an air inlet hole of the outer layer cavity, the other end of the outer layer sealing base is communicated with the isolating air passage, and the isolating air passage is a passage formed by the outer layer corrugated pipe sleeved outside the inner layer corrugated pipe and in the middle of the inner layer corrugated pipe;
the static ring seat is provided with a second air inlet through hole and an air groove, one end of the second air inlet through hole is communicated with the isolation air passage, the other end of the second air inlet through hole is communicated with the air groove, the air groove is an annular groove belt above the second air inlet through hole, and the radial position of the air groove is the same as that of the static ring air hole;
and the seal end face of the static ring is tightly attached to the seal end face of the dynamic ring when the dynamic ring is in a static state, the first air inlet through hole of the outer sealing base and the isolation air channel, the second air inlet through hole and the static ring seat air groove form an air passage for conveying isolation air to the static ring air hole, and the isolated gas acts on the sealing end surface of the static ring and the sealing end surface of the dynamic ring through the pressure stabilizing groove to generate static pressure effect, so that the sealing end surface of the static ring and the sealing end surface of the dynamic ring are opened, when the dynamic ring runs at a preset rotating speed, the static ring sealing end face and the dynamic ring sealing end face are opened under the static pressure action of the isolation gas to form a gap, so that the inflow clearance plays a role in lubricating the static ring sealing end face and the dynamic ring sealing end face, the isolation gas is led to the inner side and the outer side, and the isolation gas is used for isolating and sealing media on the two sides.
Optionally, the stationary ring seal assembly further comprises: further comprising: an inner damping band and an outer damping band; the outer side sealing base is provided with an upper convex edge, the inner wall of the upper convex edge is provided with a first clamping groove, and the inner layer damping belt is clamped in the first clamping groove; a second clamping groove is formed in the inner wall of the sealing shell, and the outer layer damping belt is clamped in the second clamping groove.
Optionally, the pressure stabilizing groove is an annular groove belt with a rectangular cross section, the pressure stabilizing groove is positioned in a position where the sum of the outer diameter and the inner diameter is equal to the sum of the inner diameter and the outer diameter of the sealing end surface of the stationary ring, the width of the pressure stabilizing groove is greater than or equal to the diameter of the air hole of the stationary ring, and the depth of the pressure stabilizing groove is greater than or equal to 0.1 mm.
Optionally, the moving ring is processed by using hard alloy or surface spraying technology, or by using hard alloy, so as to ensure the surface hardness of the sealing end face of the moving ring.
Optionally, a small-bore throttling nozzle is embedded in a connecting end of the air hole and the pressure stabilizing groove;
optionally, the number of the air holes is at least 2, and the air holes are uniformly distributed below the pressure stabilizing grooves on the stationary ring;
optionally, the number of the first air inlet through holes of the outer-layer sealing base is at least 2, and the first air inlet through holes are uniformly distributed on the outer-layer sealing base;
optionally, the difference between the inner diameter of the outer corrugated pipe and the outer diameter of the inner corrugated pipe is greater than or equal to 2 mm.
The outer-layer corrugated pipe is sleeved on the outer side of the inner-layer corrugated pipe to form the isolation air passage, and the metal welding corrugated pipe is used as the elastic element. In addition, under the static condition of rotating ring, the accessible lets in the isolation gas and produces the static pressure effect for rotating ring seal end face and quiet ring seal end face are opened, can realize isolation gas to the isolation and the sealed effect of both sides medium through the mode of atmoseal like this. Meanwhile, due to the introduction of the isolation gas, no matter whether the rotating speed of the main shaft pump reaches the preset rotating speed or not, media on two sides can be effectively prevented from meeting and leaking, and meanwhile, due to the isolation gas film between the sealing end face of the movable ring and the sealing end face of the static ring, the lubricating performance between sealing faces is well guaranteed, and the service life of the sealing assembly is prolonged.
On the other hand, the invention discloses a static pressure isolation sealing method for a double-corrugated-pipe type turbine pump, which comprises the following steps:
firstly, fixing a static ring assembly in the sealing assembly in an outer layer cavity, wherein a first air inlet through hole of an outer layer sealing base in the sealing assembly is connected with an air inlet channel of the outer layer cavity;
sleeving an outer corrugated pipe in the sealing assembly outside an inner corrugated pipe in the sealing assembly to form an isolation air passage between the inner corrugated pipe and the outer corrugated pipe;
clamping a moving ring in the sealing assembly between a transmission shaft and a positioning shaft sleeve, wherein a sealing end face of the moving ring in the sealing assembly is in close contact with a sealing end face of a static ring in the sealing assembly, and an inner corrugated pipe in the sealing assembly is compressed with an outer corrugated pipe in the sealing assembly;
and fourthly, in a static ring component in the sealing component, an isolation air passage is formed by a first air inlet through hole of an outer layer sealing base in the sealing component and an outer layer corrugated pipe in the sealing component which are sleeved outside an inner layer corrugated pipe in the sealing component, a second air inlet through hole of the static ring base in the sealing component, a static ring air hole in the sealing component and a pressure stabilizing groove in the sealing component, isolation air enters from an outer layer cavity through the air passage and acts between a static ring sealing end face and a moving ring sealing end face in the sealing component, so that the static ring sealing end face and the moving ring sealing end face in the sealing component are opened, and the isolation air respectively flows to two sides to realize the functions of end face lubrication and media on two sides.
Drawings
Various other advantages and aspects will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural view of a static pressure isolation seal assembly for a dual bellows turbine pump according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a stationary ring in an isolation seal assembly for a dual bellows type turbo pump according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First, a static pressure isolation seal assembly for a dual bellows type turbo pump according to an embodiment of the present invention will be described.
Referring to fig. 1, a schematic structural diagram of a static pressure isolation seal assembly for a dual bellows turbo pump according to an embodiment of the present invention is shown. As shown in fig. 1, the seal assembly is used in a turbo pump, which includes a drive shaft 1. In an embodiment of the present invention, the static pressure isolation seal assembly for a dual bellows turbine pump comprises: the device comprises an inner-layer sealing base 2, an outer-layer sealing base 3, an inner-layer corrugated pipe 4, an outer-layer corrugated pipe 5, a static ring seat 6, a static ring 7 (the static ring 7 is used as a compensation ring), a dynamic ring 8, a positioning shaft sleeve 9, a small-bore throttling nozzle 10, an inner-layer damping belt 11, an outer-layer damping belt 12 and a sealing shell 13.
The inner layer corrugated pipe 4 and the outer layer corrugated pipe 5 can be metal welding corrugated pipes with various cross-sectional shapes, which are not listed here.
In the embodiment of the present invention, the rotating ring 8 may be fixed to the transmission shaft 1 by methods including, but not limited to, interference fit, etc., the rotating ring 8 is clamped between the transmission shaft 1 and the positioning sleeve 9, and the rotating ring 8 has a rotating ring sealing end face 81 (specifically, located on the left side of the rotating ring 8 in fig. 1), and the surface of the rotating ring sealing end face 81 is subjected to surface spraying treatment to increase the surface hardness.
The stationary ring 7 is provided with a stationary ring sealing end face 71 (specifically, positioned on the right side of the stationary ring 7 in fig. 1), the stationary ring 7 is provided with an air hole 400, the air hole 400 is matched with the small-bore throttling nozzle 10, and as shown in fig. 2, the stationary ring sealing end face 71 is provided with a pressure stabilizing groove 72.
In specific implementation, the pressure stabilizing groove 72 needs to meet the requirement that the sum of the inner diameter and the outer diameter of the pressure stabilizing groove 72 is equal to the sum of the inner diameter and the outer diameter of the stationary ring 7, optionally, the width of the pressure stabilizing groove 72 is greater than or equal to the diameter of the stationary ring air hole 400, and the depth of the pressure stabilizing groove is greater than or equal to 0.1 mm.
Specifically, the number of the air holes 400 is at least 2, and the air holes are arranged below the pressure stabilizing groove 72 and distributed uniformly; the small-aperture throttling nozzle 10 is externally embedded in the air hole 400, and the embodiment of the invention does not limit the specific values of the width, the position, the diameter and the size of the small-aperture throttling nozzle of the pressure stabilizing groove.
The air hole 400 below is opposite to the air groove on the inner surface of the static ring space of the static ring seat 6, the air groove is an annular groove belt, the second air inlet through hole 300 is arranged below the air groove, one end of the second air inlet through hole 300 is communicated with the air groove, and the other end of the second air inlet through hole is communicated with the isolation air passage 200.
Two first air inlet through holes are at least formed in the outer sealing base 3 and are evenly distributed in the outer sealing base, one end of each first air inlet through hole is communicated with the outer cavity air inlet channel 100, and the other end of each first air inlet through hole is communicated with the isolation air channel 200.
The difference between the inner diameter of the outer corrugated pipe 5 and the outer diameter of the inner corrugated pipe 4 is more than or equal to 2 mm.
The outer damping belt 12 is arranged in a second clamping groove of the sealing cavity 13, the inner damping belt 11 is arranged in a first clamping groove of a convex edge of the outer sealing base 3, the outer sealing base 3 is fixedly connected with the bottom edge of the inner sealing base 2 in a form shown by a welding seam 15 in fig. 1, the outer sealing base 3 is fixedly connected with the bottom edge of the sealing cavity 13 in a welding form shown by a welding seam 14 in fig. 1, and the fixed connection form is not limited in the embodiment of the invention.
The isolation gas is introduced through the gas passage 100, flows into the isolation gas passage 200 formed by sleeving the inner-layer corrugated pipe 4 on the outer-layer sealing base 3 through the first gas inlet through hole on the outer-layer sealing base 3 and then flows into the second gas inlet through hole and the gas inlet groove 300 on the static ring seat 6, acts on the static ring sealing end face 71 through the static ring gas hole 400, flows into the inner side and the outer side of the sealing assembly respectively, isolates media on the two sides, and the isolation sealing effect is realized.
In order to facilitate understanding of the present invention by those skilled in the art, the following describes a process for manufacturing and assembling a static pressure isolation seal for a dual bellows type turbo pump and an operation principle thereof, with reference to fig. 1.
During practical processing, an operator can install the stationary ring 7 in the stationary ring space of the stationary ring seat 6, then sequentially carry out the fixed connection of the inner corrugated pipe 4 and the stationary ring seat 6, the inner corrugated pipe 4 and the inner sealing base 2, the outer corrugated pipe 5 is sleeved outside the inner corrugated pipe 4 from the lower side, and the fixed connection of the outer corrugated pipe 5 and the stationary ring seat 6 is carried out, the inner damping belt 11 is preset in the first clamping groove at the raised edge of the outer sealing base 3, the inner damping belt is sleeved on the inner sealing base 2 from bottom to top, the inner sealing base 2 and the outer sealing base 3 are sequentially carried out, the fixed connection of the outer corrugated pipe 5 and the outer damping belt 3 is sequentially carried out, the outer damping belt 12 is preset in the second clamping groove of the sealing cavity 13, the outer sealing base 3 is sleeved from the lower side, and the fixed connection of the rest outer sealing base 3 of the sealing cavity 13 is completed.
After processing, dual bellows formula static pressure seal assembly contains rotating ring and quiet ring subassembly, and quiet ring subassembly is an integral unit, can directly wholly arrange the work cavity in, and 1 step department of transmission shaft is arranged in to rotating ring 8, and the opposite side has location axle sleeve 9 to compress tightly, can see that the rotating ring is reliably fixed in fixed position, the very big axial dimensions that has saved of this seal structure form.
Under the condition that the movable ring 8 is static, the movable ring sealing end face 81 of the movable ring 8 is tightly attached to the static ring sealing end face 71 of the static ring 7, so that the sealing of media on two sides under the static state can be realized; before the driving stage, let in isolation gas through air flue 100, first air inlet through-hole inflow on outer base 3 is by keeping apart air flue 200, second air inlet through-hole and air pocket 300 on the quiet ring seat 6 of reentrant, act on quiet ring seal terminal surface 71 through quiet ring gas pocket 400, make quiet ring seal terminal surface 81 of quiet ring 8 and rotating ring seal terminal surface 91 of rotating ring 9 open, it can flow into to the inside and outside both sides of seal assembly respectively to keep apart the both sides medium like this, realize keeping apart sealed effect, under the high-speed moving ring's of 8 circumstances of moving ring, keep apart gas and form ultra-thin lubricated air film between quiet ring seal terminal surface 81 of quiet ring 8 and rotating ring seal terminal surface 91 of rotating ring 9, when guaranteeing sealing performance, realize the lubrication action of air film to seal terminal surface, promote sealed life-span.
Corresponding to the static pressure isolation sealing component for the double-corrugated-pipe type turbo pump, the invention also discloses a static pressure isolation sealing method for the double-corrugated-pipe type turbo pump, which at least comprises the following steps:
firstly, fixing a static ring assembly in the sealing assembly in an outer layer cavity, wherein a first air inlet through hole of an outer layer sealing base in the sealing assembly is connected with an air inlet channel of the outer layer cavity;
sleeving an outer corrugated pipe in the sealing assembly outside an inner corrugated pipe in the sealing assembly to form an isolation air passage between the inner corrugated pipe and the outer corrugated pipe;
clamping a moving ring in the sealing assembly between a transmission shaft and a positioning shaft sleeve, wherein a sealing end face of the moving ring in the sealing assembly is in close contact with a sealing end face of a static ring in the sealing assembly, and an inner corrugated pipe in the sealing assembly is compressed with an outer corrugated pipe in the sealing assembly;
and fourthly, in a static ring component in the sealing component, an isolation air passage is formed by a first air inlet through hole of an outer layer sealing base in the sealing component and an outer layer corrugated pipe in the sealing component which are sleeved outside an inner layer corrugated pipe in the sealing component, a second air inlet through hole of the static ring base in the sealing component, a static ring air hole in the sealing component and a pressure stabilizing groove in the sealing component, isolation air enters from an outer layer cavity through the air passage and acts between a static ring sealing end face and a moving ring sealing end face in the sealing component, so that the static ring sealing end face and the moving ring sealing end face in the sealing component are opened, and the isolation air respectively flows to two sides to realize the functions of end face lubrication and media on two sides.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The utility model provides a seal assembly is kept apart to static pressure for dual ripple tubular turbo pump which characterized in that, seal assembly is kept apart to static pressure for dual ripple tubular turbo pump includes: the sealing device comprises a sealing shell, an outer-layer sealing base, an inner-layer sealing base, an outer-layer corrugated pipe, an inner-layer corrugated pipe, a static ring seat, a static ring and a dynamic ring; wherein,
the sealing shell is fixedly connected with the bottom of the outer-layer sealing base, the outer-layer sealing base is fixedly connected with the bottom of the inner-layer sealing base, the outer-layer sealing base is fixedly connected with the lower end of the outer-layer corrugated pipe, and the outer-layer sealing base is provided with a first air inlet through hole; the outer corrugated pipe is sleeved outside the inner corrugated pipe, and an isolation air passage is arranged between the inner corrugated pipe and the outer corrugated pipe; one end of a first air inlet through hole of the outer layer sealing base is communicated with an air inlet channel of the outer layer cavity, and the other end of the first air inlet through hole is communicated with the isolating air passage; the static ring seat is provided with a static ring space, the static ring seat is provided with a second air inlet through hole, and the upper side of the second air inlet through hole of the static ring seat is provided with an air inlet groove; the static ring seat is fixedly connected with the upper ends of the inner-layer corrugated pipe and the outer-layer corrugated pipe;
the static ring is arranged in the static ring space of the static ring seat and is fixedly connected with the static ring seat; one end of the static ring is provided with a static ring sealing end face, and the static ring sealing end face is provided with a pressure stabilizing groove; an air hole is formed below the pressure stabilizing groove; one end of the movable ring is provided with a movable ring sealing end face, and the static ring sealing end face is opposite to the movable ring sealing end face; the seal shell, the outer seal base, the inner seal base, the outer corrugated pipe, the inner corrugated pipe, the static ring base and the static ring form a static ring component together;
the static ring assembly is matched with the outer layer cavity and is in a static state, and the dynamic ring is matched with the rotor; if the first air inlet through hole of the outer layer sealing base is not filled with isolation air, the sealing end face of the static ring is tightly attached to the sealing end face of the dynamic ring; the first air inlet through hole of the outer layer sealing base is filled with isolating air, and the isolating air acts between the static ring sealing end face and the dynamic ring sealing end face through the isolating air passage, the second air inlet through hole of the static ring seat and the air inlet groove as well as the static ring air hole and the pressure stabilizing groove to generate a static pressure effect so as to open the static ring sealing end face and the dynamic ring sealing end face; and when the moving ring is static, isolating gas is introduced, so that the sealing end face of the static ring and the sealing end face of the moving ring are opened.
2. The seal assembly according to claim 1, wherein the surge tank is an annular groove belt with a rectangular cross section, the sum of the outer diameter and the inner diameter of the surge tank is equal to the sum of the inner diameter and the outer diameter of the sealing end surface of the stationary ring, the width of the surge tank is greater than or equal to the diameter of the stationary ring air hole, and the depth of the surge tank is greater than or equal to 0.1 mm.
3. The seal assembly according to claim 1, wherein at least two air holes are formed below the pressure stabilizing groove, the radial positions of the at least two air holes are the same as that of the pressure stabilizing groove, and the at least two air holes are uniformly distributed below the pressure stabilizing groove.
4. The seal assembly according to claim 1, wherein an air groove is formed in an inner surface of the stationary ring space of the stationary ring seat, the air groove is an annular groove belt, the radial position of the air groove corresponds to the stationary ring air hole, one end of a second air inlet through hole in the stationary ring seat is communicated with the air groove, and the other end of the second air inlet through hole is communicated with the isolation air passage.
5. The seal assembly according to claim 1, wherein the outer seal base is provided with at least two first air inlet through holes, the at least two first air inlet through holes are uniformly distributed on the outer seal base, and the first air inlet holes are formed in the outer seal base.
6. The seal assembly of claim 1, wherein the difference between the outer bellows inner diameter and the inner bellows outer diameter is greater than or equal to 2 millimeters.
7. A static pressure isolation seal method for a dual bellows type turbo pump, applied to the static pressure isolation seal assembly for a dual bellows type turbo pump as claimed in any one of claims 1 to 6, the method comprising:
firstly, fixing a static ring assembly in the sealing assembly in an outer layer cavity, wherein a first air inlet through hole of an outer layer sealing base in the sealing assembly is connected with an air inlet channel of the outer layer cavity;
sleeving an outer corrugated pipe in the sealing assembly outside an inner corrugated pipe in the sealing assembly to form an isolation air passage between the inner corrugated pipe and the outer corrugated pipe;
clamping a moving ring in the sealing assembly between a transmission shaft and a positioning shaft sleeve, wherein a sealing end face of the moving ring in the sealing assembly is in close contact with a sealing end face of a static ring in the sealing assembly, and an inner corrugated pipe in the sealing assembly is compressed with an outer corrugated pipe in the sealing assembly;
and fourthly, in a static ring component in the sealing component, an isolation air passage is formed by a first air inlet through hole of an outer layer sealing base in the sealing component and an outer layer corrugated pipe in the sealing component which are sleeved outside an inner layer corrugated pipe in the sealing component, a second air inlet through hole of the static ring base in the sealing component, a static ring air hole in the sealing component and a pressure stabilizing groove in the sealing component, isolation air enters from an outer layer cavity through the air passage and acts between a static ring sealing end face and a moving ring sealing end face in the sealing component, so that the static ring sealing end face and the moving ring sealing end face in the sealing component are opened, and the isolation air respectively flows to two sides to realize the functions of end face lubrication and media on two sides.
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| CN202210047557.5A CN114294257B (en) | 2022-01-17 | 2022-01-17 | Static pressure isolation sealing assembly and method for double bellows turbine pump |
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| CN202210047557.5A CN114294257B (en) | 2022-01-17 | 2022-01-17 | Static pressure isolation sealing assembly and method for double bellows turbine pump |
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| CN114294257A true CN114294257A (en) | 2022-04-08 |
| CN114294257B CN114294257B (en) | 2024-08-09 |
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| CN217301001U (en) * | 2022-01-17 | 2022-08-26 | 北京化工大学 | Static pressure isolation seal assembly for double-corrugated pipe type turbo pump |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB830059A (en) * | 1957-10-15 | 1960-03-09 | Napier & Son Ltd | Annular face shaft seals |
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| CN209586768U (en) * | 2018-11-13 | 2019-11-05 | 陕西蓝箭航天技术有限公司 | Dynamic sealing device and turbine pump installation for turbine pump |
| CN110985433A (en) * | 2019-12-30 | 2020-04-10 | 蓝箭航天空间科技股份有限公司 | Adjustable and controllable dynamic sealing device for turbine pump and turbine pump set |
| CN112145471A (en) * | 2020-10-22 | 2020-12-29 | 航天科工火箭技术有限公司 | Gas disengaging type combined dynamic sealing device |
| CN217301001U (en) * | 2022-01-17 | 2022-08-26 | 北京化工大学 | Static pressure isolation seal assembly for double-corrugated pipe type turbo pump |
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| 高武民: "波纹管机械密封使用经验", 设备管理与维修, no. 07, 31 July 2002 (2002-07-31), pages 31 * |
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