CN220909977U - Multistage decompression piston sealing structure of liquid hydrogen pump - Google Patents
Multistage decompression piston sealing structure of liquid hydrogen pump Download PDFInfo
- Publication number
- CN220909977U CN220909977U CN202322929777.3U CN202322929777U CN220909977U CN 220909977 U CN220909977 U CN 220909977U CN 202322929777 U CN202322929777 U CN 202322929777U CN 220909977 U CN220909977 U CN 220909977U
- Authority
- CN
- China
- Prior art keywords
- sealing structure
- ring
- pump body
- piston
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 121
- 239000007788 liquid Substances 0.000 title claims abstract description 53
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 43
- 239000001257 hydrogen Substances 0.000 title claims abstract description 43
- 230000006837 decompression Effects 0.000 title claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 125000006850 spacer group Chemical group 0.000 claims abstract description 12
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002360 explosive Substances 0.000 abstract description 3
- 238000009835 boiling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Details Of Reciprocating Pumps (AREA)
- Compressor (AREA)
Abstract
The utility model relates to the technical field of liquid hydrogen filling, in particular to a multistage decompression piston sealing structure of a liquid hydrogen pump. A guide ring and a primary sealing structure are arranged between the piston head and the pump body, and the primary sealing structure is used for bearing high-pressure sealing; a secondary sealing structure and a tertiary sealing structure are arranged between the piston rod and the pump body, the secondary sealing structure is used for pressure reduction sealing, the secondary sealing structure and the tertiary sealing structure are isolated by a spacer bush, the third-stage sealing structure, the spacer bush and the second-stage sealing structure are fixed by pressing through a tightening sleeve arranged at the end part of the pump body, and a fourth-stage sealing structure is arranged between the tightening sleeve and the pump body. Form multistage sealed structural style, when the liquid hydrogen in the compression chamber takes place to leak, leak pressure can reduce step by step to adapt to low temperature high pressure's operational environment, long service life, sealed effect is better, can effectively avoid liquid hydrogen to leak outward between piston head and the pump body, between piston rod and the pump body, promotes compression efficiency, avoids taking place inflammable and explosive danger.
Description
Technical field:
The utility model relates to the technical field of liquid hydrogen filling, in particular to a multistage decompression piston sealing structure of a liquid hydrogen pump.
The background technology is as follows:
At present, with the wide application of liquid hydrogen energy sources, liquid hydrogen filling is more and more important. Liquid hydrogen is a low-temperature liquid fuel, the temperature of which can be as low as-200 ℃ to-250 ℃, the boiling point of which is extremely low, and which is easy to vaporize, and the liquid hydrogen is generally filled by a liquid hydrogen pump, and the pressure can reach 50MPa during filling. The existing liquid hydrogen pump generally adopts a plunger pump, wherein a sealing structure is required to be arranged between a piston head and a pump body and between a piston rod and the pump body so as to seal liquid hydrogen. However, when in actual work, the existing sealing structure cannot adapt to the working environment of low temperature and high pressure due to the influence of low temperature and high pressure, so that the service life is short, the sealing effect is poor, liquid hydrogen is easy to leak outwards from between the piston head and the pump body and between the piston rod and the pump body, the compression efficiency is reduced, and the danger of inflammability and explosiveness is easy to occur after the liquid hydrogen leaks.
In summary, the sealing problem of the liquid hydrogen pump in the liquid hydrogen filling process has become a technical problem to be solved in industry.
The utility model comprises the following steps:
The utility model provides a multistage pressure-reducing piston sealing structure of a liquid hydrogen pump, which aims to overcome the defects of the prior art and solves the problems of short service life, poor sealing effect and easy liquid hydrogen leakage of the traditional sealing structure.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
The multistage decompression piston sealing structure of the liquid hydrogen pump comprises a pump body, a compression cavity is arranged in the pump body, a liquid inlet and a liquid outlet which are communicated with the compression cavity are formed in the pump body, a piston is arranged in the pump body, the piston comprises a piston head and a piston rod, a guide ring and a primary sealing structure are arranged between the piston head and the pump body, and the primary sealing structure is used for bearing high-pressure sealing; a secondary sealing structure and a tertiary sealing structure are arranged between the piston rod and the pump body, the secondary sealing structure is used for pressure reduction sealing, the secondary sealing structure and the tertiary sealing structure are isolated by a spacer bush, the third-stage sealing structure, the spacer bush and the second-stage sealing structure are fixed by pressing through a tightening sleeve arranged at the end part of the pump body, and a fourth-stage sealing structure is arranged between the tightening sleeve and the pump body.
The primary sealing structure comprises a plurality of annular grooves which are arranged on the outer surface of the piston head at intervals, an expansion ring is respectively arranged in each annular groove, and an L-shaped combined seal is arranged in the annular groove at the outer side of each expansion ring.
The L-shaped combined seal comprises an L-shaped seal ring and a U-shaped seal ring, the bottom of the L-shaped seal ring supports the U-shaped seal ring, a locating pin is arranged between the L-shaped seal ring and the U-shaped seal ring for installation and fixation, and the surfaces of the outer rings of the L-shaped seal ring and the U-shaped seal ring are flush.
The surface of the inner ring of the L-shaped sealing ring is in contact fit with the expansion ring for installation, and the surfaces of the outer rings of the L-shaped sealing ring and the U-shaped sealing ring are in contact fit with the pump body for sealing.
The expansion ring is made of low-temperature-resistant metal materials.
The L-shaped sealing ring and the U-shaped sealing ring are made of low-temperature resistant rubber materials.
The secondary sealing structure comprises a plurality of L-shaped secondary supporting rings, the outer ring surfaces of the secondary supporting rings are in contact fit with the pump body, the inner ring surfaces of the secondary supporting rings are in clearance fit with the piston rod, two decompression rings are respectively arranged on the inner sides of each secondary supporting ring, and the inner ring surfaces of the decompression rings are in contact fit with the piston rod to seal.
The three-stage sealing structure comprises an L-shaped three-stage supporting ring, the outer ring surface of the three-stage supporting ring is in contact fit with the pump body, the inner ring surface of the three-stage supporting ring is in clearance fit with the piston rod, a plurality of V-shaped sealing rings are arranged on the inner side of the three-stage supporting ring, and the inner ring surface of the V-shaped sealing rings is in contact fit with the piston rod to seal.
The four-stage sealing structure comprises a spring force accumulation ring, and the outer ring surface and the inner ring surface of the spring force accumulation ring are respectively matched with the pump body and the tightening ring in a sealing way.
A cylinder sleeve is arranged between the pump body and the piston head.
The utility model adopts the scheme and has the following advantages:
Through being equipped with one-level seal structure between piston head and the pump body, be equipped with second grade seal structure and tertiary seal structure between piston rod and the pump body, be equipped with four-level seal structure between last tight sleeve and the pump body, form multistage sealed structural style, when the liquid hydrogen in the compression chamber takes place to leak, leak pressure can reduce step by step, in order to adapt to low temperature high pressure's operational environment, long service life, sealing effect is better, can effectively avoid liquid hydrogen to leak outward between piston head and the pump body, between piston rod and the pump body, promote compression efficiency, avoid taking place inflammable and explosive danger.
Description of the drawings:
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is an enlarged schematic view of the portion a in fig. 1.
Fig. 3 is an enlarged schematic view of the B part in fig. 1.
Fig. 4 is an enlarged schematic view of the C portion in fig. 1.
Fig. 5 is an enlarged schematic view of the portion D in fig. 1.
In the figure, 1, a pump body, 2, a liquid inlet, 3, a liquid outlet, 4, a piston head, 5, a piston rod, 6, a guide ring, 7, a spacer bush, 8, a tightening bush, 9, an expansion ring, 10, an L-shaped sealing ring, 11, a U-shaped sealing ring, 12, a locating pin, 13, a secondary supporting ring, 14, a decompression ring, 15, a tertiary supporting ring, 16, a V-shaped sealing ring, 17, a spring power accumulating ring, 18 and a cylinder sleeve.
The specific embodiment is as follows:
in order to clearly illustrate the technical features of the present solution, the present utility model will be described in detail below with reference to the following detailed description and the accompanying drawings.
As shown in fig. 1-5, a multistage decompression piston sealing structure of a liquid hydrogen pump comprises a pump body 1, wherein a compression cavity is arranged in the pump body 1, a liquid inlet 2 and a liquid outlet 3 which are communicated with the compression cavity are arranged on the pump body 1, a piston is arranged in the pump body 1, the piston comprises a piston head 4 and a piston rod 5, a guide ring 6 and a primary sealing structure are arranged between the piston head 4 and the pump body 1, the guide ring 6 is used for guiding the reciprocating motion of the piston head 4, and the primary sealing structure is nearest to the compression cavity and is used for bearing high-pressure sealing; the piston rod 5 is provided with a secondary sealing structure and a tertiary sealing structure between the piston rod and the pump body 1, the secondary sealing structure is used for decompression sealing, the secondary sealing structure is isolated from the tertiary sealing structure through a spacer 7, the tertiary sealing structure, the spacer 7 and the secondary sealing structure are fixed by being pressed by a tightening sleeve 8 arranged at the end part of the pump body 1, and a quaternary sealing structure is arranged between the tightening sleeve 8 and the pump body 1.
The primary sealing structure comprises a plurality of annular grooves which are arranged on the outer surface of the piston head 4 at intervals, an expansion ring 9 is respectively arranged in each annular groove, and an L-shaped combined seal is arranged in the annular groove at the outer side of the expansion ring 9 and can bear high-pressure sealing.
The L-shaped combined seal comprises an L-shaped seal ring 10 and a U-shaped seal ring 11, the bottom of the L-shaped seal ring 10 supports the U-shaped seal ring 11, a locating pin 12 is arranged between the L-shaped seal ring 10 and the U-shaped seal ring 11 for installation and fixation, the strength is improved, the L-shaped combined seal can bear higher pressure, is not easy to deform and damage, and the outer ring surfaces of the L-shaped seal ring 10 and the U-shaped seal ring 11 are flush.
The inner ring surface of the L-shaped sealing ring 10 is in contact fit with the expansion ring 9 for installation, and the outer ring surfaces of the L-shaped sealing ring 10 and the U-shaped sealing ring 11 are in contact fit with the pump body 1 for sealing.
The expansion ring 9 is made of low-temperature-resistant metal material.
The L-shaped sealing ring 10 and the U-shaped sealing ring 11 are made of low-temperature-resistant rubber materials.
The secondary sealing structure comprises a plurality of L-shaped secondary support rings 13, the outer ring surfaces of the secondary support rings 13 are in contact fit with the pump body 1, the inner ring surfaces of the secondary support rings 13 are in clearance fit with the piston rods 5, two decompression rings 14 are respectively arranged on the inner sides of each secondary support ring 13, the inner ring surfaces of the decompression rings 14 are in contact fit with the piston rods 5 to seal, and the liquid hydrogen pressure after leakage can be reduced.
The three-stage sealing structure comprises an L-shaped three-stage supporting ring 15, the outer ring surface of the three-stage supporting ring 15 is in contact fit with the pump body 1, the inner ring surface of the three-stage supporting ring 15 is in clearance fit with the piston rod 5, a plurality of V-shaped sealing rings 16 are arranged on the inner side of the three-stage supporting ring 15, and the inner ring surface of the V-shaped sealing rings 16 is in contact fit with the piston rod 5 for sealing.
The spacer bush 7 is arranged between the secondary sealing structure and the tertiary sealing structure, the section of the spacer bush 7 is U-shaped, and an annular cavity is formed between the spacer bush 7 and the piston rod 5 and can be used for temporarily storing leaked liquid hydrogen.
The four-stage sealing structure comprises a spring force accumulation ring 17, and the outer ring surface and the inner ring surface of the spring force accumulation ring 17 are respectively in contact fit with the pump body 1 and the tightening sleeve 8 to seal, so that liquid hydrogen is prevented from leaking to the outside of the pump body 1.
A cylinder sleeve 18 is arranged between the pump body 1 and the piston head 4 to protect the pump body 1, and the cylinder sleeve 18 is convenient to assemble, disassemble and replace.
Working principle:
When the device works, liquid hydrogen enters the compression cavity from the liquid inlet 2 for pressurization under the reciprocating motion of the piston, and then is discharged outwards from the liquid outlet 3. The L-shaped combined seals are arranged between the piston head 4 and the pump body 1 to form a primary sealing structure, can bear high-pressure sealing, has good sealing effect and long service life, and can effectively avoid liquid hydrogen from leaking outwards from between the piston head 4 and the pump body 1. The two-stage sealing structure is formed by the two-stage supporting rings 13 and the pressure reducing rings 14 arranged between the piston rod 5 and the pump body 1, the liquid hydrogen pressure after leakage can be reduced, and the three-stage sealing structure is formed by the three-stage supporting rings 15 and the V-shaped sealing rings 16 arranged between the piston rod 5 and the pump body 1, so that the liquid hydrogen can be effectively prevented from leaking outwards from between the piston rod 5 and the pump body 1. The spring power-accumulating ring 17 arranged between the tightening sleeve 8 and the pump body 1 forms a four-stage sealing structure, and the danger that liquid hydrogen leaks to the outside of the pump body 1 and is inflammable and explosive can be effectively avoided.
The above embodiments are not to be taken as limiting the scope of the utility model, and any alternatives or modifications to the embodiments of the utility model will be apparent to those skilled in the art and fall within the scope of the utility model.
The present utility model is not described in detail in the present application, and is well known to those skilled in the art.
Claims (10)
1. The utility model provides a multistage decompression piston seal structure of liquid hydrogen pump, includes the pump body, is equipped with the compression chamber in the pump body, is equipped with inlet and the liquid outlet that are linked together with the compression chamber on the pump body, is equipped with the piston in the pump body, and the piston includes piston head and piston rod, its characterized in that: a guide ring and a primary sealing structure are arranged between the piston head and the pump body, and the primary sealing structure is used for bearing high-pressure sealing; a secondary sealing structure and a tertiary sealing structure are arranged between the piston rod and the pump body, the secondary sealing structure is used for pressure reduction sealing, the secondary sealing structure and the tertiary sealing structure are isolated by a spacer bush, the third-stage sealing structure, the spacer bush and the second-stage sealing structure are fixed by pressing through a tightening sleeve arranged at the end part of the pump body, and a fourth-stage sealing structure is arranged between the tightening sleeve and the pump body.
2. The liquid hydrogen pump multistage pressure reducing piston sealing structure according to claim 1, wherein: the primary sealing structure comprises a plurality of annular grooves which are arranged on the outer surface of the piston head at intervals, an expansion ring is respectively arranged in each annular groove, and an L-shaped combined seal is arranged in the annular groove at the outer side of each expansion ring.
3. The multistage decompression piston sealing structure of a liquid hydrogen pump according to claim 2, wherein: the L-shaped combined seal comprises an L-shaped seal ring and a U-shaped seal ring, the bottom of the L-shaped seal ring supports the U-shaped seal ring, a locating pin is arranged between the L-shaped seal ring and the U-shaped seal ring for installation and fixation, and the surfaces of the outer rings of the L-shaped seal ring and the U-shaped seal ring are flush.
4. A liquid hydrogen pump multistage pressure reduction piston seal structure according to claim 3, wherein: the surface of the inner ring of the L-shaped sealing ring is in contact fit with the expansion ring for installation, and the surfaces of the outer rings of the L-shaped sealing ring and the U-shaped sealing ring are in contact fit with the pump body for sealing.
5. The multistage decompression piston sealing structure of a liquid hydrogen pump according to claim 2, wherein: the expansion ring is made of low-temperature-resistant metal materials.
6. A liquid hydrogen pump multistage pressure reduction piston seal structure according to claim 3, wherein: the L-shaped sealing ring and the U-shaped sealing ring are made of low-temperature resistant rubber materials.
7. The liquid hydrogen pump multistage pressure reducing piston sealing structure according to claim 1, wherein: the secondary sealing structure comprises a plurality of L-shaped secondary supporting rings, the outer ring surfaces of the secondary supporting rings are in contact fit with the pump body, the inner ring surfaces of the secondary supporting rings are in clearance fit with the piston rod, two decompression rings are respectively arranged on the inner sides of each secondary supporting ring, and the inner ring surfaces of the decompression rings are in contact fit with the piston rod to seal.
8. The liquid hydrogen pump multistage pressure reducing piston sealing structure according to claim 1, wherein: the three-stage sealing structure comprises an L-shaped three-stage supporting ring, the outer ring surface of the three-stage supporting ring is in contact fit with the pump body, the inner ring surface of the three-stage supporting ring is in clearance fit with the piston rod, a plurality of V-shaped sealing rings are arranged on the inner side of the three-stage supporting ring, and the inner ring surface of the V-shaped sealing rings is in contact fit with the piston rod to seal.
9. The liquid hydrogen pump multistage pressure reducing piston sealing structure according to claim 1, wherein: the four-stage sealing structure comprises a spring force accumulation ring, and the outer ring surface and the inner ring surface of the spring force accumulation ring are respectively matched with the pump body and the tightening ring in a sealing way.
10. The liquid hydrogen pump multistage pressure reducing piston sealing structure according to claim 1, wherein: a cylinder sleeve is arranged between the pump body and the piston head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322929777.3U CN220909977U (en) | 2023-10-30 | 2023-10-30 | Multistage decompression piston sealing structure of liquid hydrogen pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322929777.3U CN220909977U (en) | 2023-10-30 | 2023-10-30 | Multistage decompression piston sealing structure of liquid hydrogen pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220909977U true CN220909977U (en) | 2024-05-07 |
Family
ID=90910729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322929777.3U Active CN220909977U (en) | 2023-10-30 | 2023-10-30 | Multistage decompression piston sealing structure of liquid hydrogen pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220909977U (en) |
-
2023
- 2023-10-30 CN CN202322929777.3U patent/CN220909977U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101936312A (en) | High-pressure piston type accumulator | |
| CN111997861B (en) | Reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss | |
| CN220909977U (en) | Multistage decompression piston sealing structure of liquid hydrogen pump | |
| CN202500761U (en) | Structure of double-stuffing box | |
| CN203161513U (en) | Novel low-temperature reciprocating pump composite sealing structure | |
| CN220910466U (en) | Multi-guide piston combined sealing structure of liquid hydrogen pump | |
| CN205349430U (en) | Novel elastic sealing structure of steam turbine intubate | |
| CN220909945U (en) | Single-guide piston sealing structure of liquid hydrogen pump | |
| CN219013025U (en) | Energy accumulator with stable operation | |
| CN201705922U (en) | Metal spring embedded seal box | |
| CN103759010A (en) | Packing shaft seal structure for high-pressure reciprocation pump | |
| CN111594412B (en) | Reciprocating submerged liquid hydrogen pump | |
| CN212251122U (en) | Ultra-low temperature stop valve combined sealing structure | |
| CN221097446U (en) | 90MPa diaphragm compressor hydro-cylinder hydraulic oil side plunger seal structure | |
| CN203257769U (en) | 70MPa stainless steel diaphragm type energy accumulator | |
| CN203052039U (en) | Combined gasket | |
| CN208885982U (en) | A kind of sealing ring and ductile iron pipe pressure testing sealing frock | |
| CN105508611A (en) | Stuffing sealing structure and plunger pump with same | |
| CN111706502A (en) | Sealing device for high-pressure plunger water injection pump packing of offshore oil platform | |
| CN111664131A (en) | Double-cylinder piston split type middle exhaust piston type energy accumulator device | |
| CN213775636U (en) | Natural gas primary compression cylinder | |
| CN111997862B (en) | Double-acting reciprocating submerged liquid hydrogen pump | |
| CN112127829A (en) | Compression packer packing element with deformation element | |
| CN214577648U (en) | Atmospheric pressure sealing cavity system for preventing air from entering | |
| CN220452126U (en) | Liquid drive circulation liquid seal compressor cylinder with isolation cavity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |