CN211116449U - Three-section type cryogenic pump for high-pressure cryogenic liquid - Google Patents
Three-section type cryogenic pump for high-pressure cryogenic liquid Download PDFInfo
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- CN211116449U CN211116449U CN201921552197.4U CN201921552197U CN211116449U CN 211116449 U CN211116449 U CN 211116449U CN 201921552197 U CN201921552197 U CN 201921552197U CN 211116449 U CN211116449 U CN 211116449U
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Abstract
The utility model discloses a three-section type cryogenic pump for high-pressure cryogenic liquid, which comprises a warm end, a middle connecting pipe and a cold end, wherein the warm end comprises a first hydraulic cylinder, a hydraulic end piston, a hydraulic end flange and a piston rod; the piston rod penetrates through the hydraulic end flange and extends to the cold end along the inner cavity of the middle connecting pipe; the cold end comprises a second flange, a second hydraulic cylinder and a second piston, and the second piston is connected with the end part of the piston rod; the end part of the second hydraulic cylinder is connected with a liquid pumping pipe, and a filter screen is sleeved at the pipe orifice of the liquid pumping pipe; a discharge flow channel is arranged on the cylinder wall of the second hydraulic cylinder close to the liquid pumping pipe, and the discharge flow channel is connected with a liquid pipe outwards; the fluid pipe turns back to pass through the second flange and the hydraulic end flange; the cryopump directly pumps out the stored high-pressure liquid, does not need to discharge the high-pressure liquid after being gasified, and is more compact in structure and higher in efficiency.
Description
Technical Field
The utility model relates to cryopump technical field, concretely relates to syllogic cryopump for high pressure cryogenic liquids.
Background
When gas is stored in a liquefied form, the gas can be stored at a higher density, the stored amount is far greater than that of the gas, the gas is more easily liquefied from the state at pressure and low temperature, and the high-pressure low-temperature liquid gas needs to be conveyed out through a low-temperature pump when the gas is used. Such as liquefied natural gas, is increasingly used in automobiles as an important fuel.
The liquefied natural gas vehicle as a new-generation environment-friendly and economic natural gas vehicle has the advantages of more gas filling, long driving distance, safety and the like, and the growth rate is increased by more than 20% every year in recent years. The prior art is that the liquefied natural gas flows into a pipeline from a liquid storage tank and enters a water bath type vaporizer, fluid in the liquefied natural gas storage tank must be pressurized again, the adopted pressurization mode is that the liquefied natural gas is gasified into gaseous natural gas through an air bath type fin heat exchanger and pressurized, the mode causes low heat exchange efficiency under the condition of low air temperature, the pressure in the liquefied natural gas storage tank hardly reaches the required pressure, the liquefied natural gas is difficult to flow out from the liquid storage tank, and the liquefied natural gas cannot flow out, so that the insufficient gas supply (poor vehicle power) of a vehicle is caused, and even the vehicle cannot be started seriously. It is therefore desirable to design a cryopump that will smoothly and timely draw liquid fluid from a storage vessel.
In addition, when the cryogenic fluid lasts the flange of cryopump, because microthermal conduction, can be quick with the flange cooling, make the piston structure temperature at flange middle part reduce fast to can influence its normal work, influence liquid fluid's taking out.
Disclosure of Invention
The utility model aims at the problem that prior art exists, provide a syllogic cryopump for high-pressure cryogenic liquid.
In order to achieve the above object, the utility model adopts the following technical scheme:
a three-section type cryogenic pump for high-pressure cryogenic liquid comprises a warm end, a middle connecting pipe and a cold end, wherein the warm end comprises a first hydraulic cylinder, and a hydraulic end piston and a piston rod are arranged in the first hydraulic cylinder; the first hydraulic cylinder is fixedly connected with one end of the middle connecting pipe through a hydraulic end flange; the piston rod penetrates through the hydraulic end flange and extends to the cold end along the inner cavity of the middle connecting pipe; the other end of the middle connecting pipe is connected with the cold end through a second flange; the cold end comprises a second hydraulic cylinder, a second piston is arranged in the second hydraulic cylinder, and the second piston is connected with the end part of the piston rod; one end, far away from the second flange, of the second hydraulic cylinder is connected with a liquid pumping pipe, a spring is sleeved on the liquid pumping pipe, a filter screen is sleeved at the pipe opening of the liquid pumping pipe, and the spring is wrapped by the filter screen; a discharge flow channel is arranged on the cylinder wall of the second hydraulic cylinder close to the liquid pumping pipe, and the discharge flow channel is connected with a liquid pipe outwards; the fluid pipe turns back to pass through the second flange and the hydraulic end flange.
The cryopump directly pumps out the stored high-pressure liquid through the matching of the hydraulic end piston, the piston rod and the second piston, and the high-pressure liquid does not need to be discharged after being gasified; the flow of the liquid pumped by the cryogenic pump can be controlled according to the reciprocating stroke of the piston at the hydraulic end.
The distance from the cold end to the warm end of the cryogenic pump is increased through the three-section connection, and the situation that the components near the warm end are cooled or frozen quickly after the fluid with lower temperature is pumped out is avoided, so that the normal work of the cryogenic pump is influenced.
The filter screen can filter impurities in the storage container, so that solid matters are prevented from being drawn into the fluid pipeline and flowing into a subsequent combustion system (such as affecting the performance of a vehicle); the spring is arranged to provide a support for the filter screen, so that the filter screen can be prevented from being sucked into the liquid suction pipe, and the impact of high-pressure liquid on the filter screen can be buffered.
The second flange, the hydraulic end flange and the connection function of the second flange and the hydraulic end flange are also beneficial to fixing a longer fluid pipe, so that the fluid pipe extends from the cold end to the warm end.
Furthermore, the end part of the second hydraulic cylinder is also provided with a pressure plate, and the pressure plate is connected and fixed with the liquid pumping pipe and the spring.
Furthermore, check valves are arranged at the connection position of the liquid pumping pipe and the second hydraulic cylinder and at the position of the liquid pipe close to the second hydraulic cylinder.
Furthermore, the two ends of the middle connecting pipe are both provided with internal threads for matching connection.
Furthermore, a support guide seat is arranged between the hydraulic end flange and the middle connecting pipe, one end of the support guide seat is matched in a flange hole of the hydraulic end flange, and the other end of the support guide seat is matched in an inner cavity of the middle connecting pipe; the periphery of the supporting guide seat is fixed with the hydraulic end flange through bolts.
Furthermore, one side of the hydraulic end flange is provided with an inclined hole channel penetrating through the end face of the hydraulic end flange, the inclined hole channel is internally provided with the fluid pipe, and a heat insulation material is filled between the fluid pipe and the inclined hole channel; the low-temperature liquid moves from the middle part close to the hydraulic end flange to the middle part far away from the hydraulic end flange through the fluid pipe.
The hydraulic end flange is completely prevented from being contacted with the hydraulic end flange by arranging the thermal insulation material in the gap between the fluid pipe and the inclined hole channel, and the thermal resistance is increased by the thermal insulation material, so that the low-temperature fluid cannot cause the quick cooling of the hydraulic end flange when passing through the fluid pipe, thereby preventing the middle component of the hydraulic end flange from being frozen, and reducing the moisture condensation and ice/frost accumulation around the components near the warm end of the low-temperature pump.
Preferably, the heat insulation material is one of RFC special-shaped heat insulation pieces, mineral wool fibers, foam particles, foam plastics, superfine glass wool and polytetrafluoroethylene pieces.
Furthermore, an oil passage is arranged on the other side of the hydraulic end flange and comprises a horizontal section and an inclined section which are communicated with each other; an internal thread structure is arranged on the outer circumferential surface of the horizontal section close to the hydraulic end flange and is connected with an external oil pipe in a fixed mode.
The obliquely arranged oil passage can reduce the flowing distance and the contact time of oil in the flange and improve the oil absorption and oil discharge efficiency; the horizontal section is a structure with a small section for transitionally connecting internal threads, and the internal thread structure is used for fixedly connecting an external oil pipe.
Furthermore, four sealing grooves are formed in the outer circumferential surface of the second piston, a plurality of round holes are uniformly distributed in each sealing groove along the radial direction of the second piston, and each sealing groove is internally provided with an elastic sealing assembly; the sealing assembly comprises a sealing spring, a stepped elastic column and a sealing ring, the sealing spring and the stepped elastic column are arranged in the circular hole, and one end of the stepped elastic column is sleeved in the sealing spring; the sealing ring is arranged in the sealing groove, and the inner circumferential surface of the sealing ring is tightly attached to the other end of the stepped elastic column.
Under the matching of the sealing spring and the stepped elastic column, the sealing assembly can adaptively adjust the contact tightness degree of the sealing ring with the second piston and the second hydraulic cylinder according to environmental changes, and automatically stretch and tighten the sealing ring after the sealing ring is worn in long-term reciprocating motion, so that the effects of supplementing and offsetting wear are achieved, the service life of the sealing assembly is integrally prolonged, and the service life of the second piston is prolonged; the elasticity post of radial equipartition is more even when providing elastic action force, and too much inside accommodation space is avoided seting up on the second piston in the round hole setting of equipartition to reduce the intensity of second piston.
Furthermore, a through stepped hole is formed in the middle of the hydraulic end piston, and one end of the piston rod is in threaded connection with the stepped hole; the end part of the second piston is provided with an internal thread hole, and the other end of the piston rod is screwed in the internal thread hole.
Compared with the prior art, the beneficial effects of the utility model are that: 1. the three-section type cryogenic pump for the high-pressure cryogenic liquid directly pumps out the stored high-pressure liquid without discharging the high-pressure liquid after gasifying the high-pressure liquid, and has more compact structure and higher efficiency; 2. the distance from the cold end to the warm end of the low-temperature pump is increased through the three-section connection, so that the situation that the normal work of the low-temperature pump is influenced because the components near the warm end are cooled or frozen quickly after the fluid with lower temperature is pumped out is avoided; 3. the filter screen can filter impurities in the storage container, so that the impurities are prevented from being pumped into the fluid pipeline; 4. the arrangement of the heat insulation material increases thermal resistance, avoids the contact between a fluid pipe and a hydraulic end flange, reduces the cooling speed of the hydraulic end flange, and reduces moisture condensation and ice/frost accumulation around a component near a low-temperature pump heating end; 5. the sealing assembly improves the sealing performance, prolongs the service life of the sealing assembly on the whole and improves the service time of the second piston.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a three-stage cryopump for high-pressure cryogenic liquid according to the present invention;
fig. 2 is a schematic diagram of the internal structure of a three-stage cryopump for high-pressure cryogenic liquid according to the present invention;
in the figure: 1. warming the end; 2. a middle connecting pipe; 3. a cold end; 4. a first hydraulic cylinder; 5. a hydraulic end flange; 6. a second hydraulic cylinder; 7. a second flange; 8. a liquid pumping pipe; 9. a fluid pipe; 10. a hydraulic end piston; 11. supporting the guide seat; 12. A piston rod; 13. a second piston; 14. a platen; 15. a check valve; 16. a spring; 17. a filter screen; 18. and a discharge flow passage.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle part", "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first embodiment is as follows:
as shown in fig. 1 and 2, a three-stage cryogenic pump for high-pressure cryogenic liquid includes a warm end 1, a middle connecting pipe 2, and a cold end 3, where the warm end 1 includes a first hydraulic cylinder 4, and a hydraulic end piston 10 and a piston rod 12 are disposed in the first hydraulic cylinder 4; the first hydraulic cylinder 4 is fixedly connected with one end of the middle connecting pipe 2 through a hydraulic end flange 5; the piston rod 12 penetrates through the hydraulic end flange 5 and extends to the cold end 3 along the inner cavity of the middle connecting pipe 2; the other end of the middle connecting pipe 2 is connected with the cold end 3 through a second flange 7; the cold end 3 comprises a second hydraulic cylinder 6, a second piston 13 is arranged in the second hydraulic cylinder 6, and the second piston 13 is connected with the end part of the piston rod 12; one end, far away from the second flange 7, of the second hydraulic cylinder 6 is connected with a liquid extracting pipe 8, a spring 16 is sleeved on the liquid extracting pipe 8, a filter screen 17 is sleeved at the pipe orifice of the liquid extracting pipe 8, and the spring 16 is wrapped by the filter screen 17; a discharge flow passage 18 is arranged on the cylinder wall of the second hydraulic cylinder 6 close to the liquid extracting pipe 8, and a liquid pipe 9 is connected to the outside of the discharge flow passage 18; the fluid pipe 9 turns back to pass through the second flange 7 and the hydraulic end flange 5.
The cryopump directly pumps out stored high-pressure liquid through the matching of the hydraulic end piston 10, the piston rod 12 and the second piston 13, and the high-pressure liquid does not need to be discharged after being gasified; the flow rate of the liquid pumped by the cryogenic pump can be controlled according to the reciprocating stroke of the hydraulic end piston 10.
The three-section connection increases the distance from the cold end 3 of the cryopump to the warm end 1, and prevents components near the warm end 1 from being cooled or frozen quickly after fluid at a lower temperature is pumped out, so that normal work of the components is influenced.
The filter screen 17 is capable of filtering impurities in the storage container, preventing solid matter from being drawn into the fluid conduit and flowing into the subsequent combustion system (affecting the performance of the vehicle); the arrangement of the spring 16 provides a support for the filter screen 17, both to prevent the filter screen 17 from being sucked into the suction line 8 and to cushion the filter screen 17 against high pressure liquid.
The second flange 7, the hydraulic end flange 5 and the connection function thereof are also beneficial to fixing the longer fluid pipe 9, so that the fluid pipe 9 extends from the cold end 3 to the warm end 1.
Further, the end of the second hydraulic cylinder 6 is further provided with a pressure plate 14, and the pressure plate 14 is sleeved on the end of the liquid extracting pipe and is connected and fixed with the liquid extracting pipe 8 and the spring 16.
Further, check valves 15 are arranged at the connection position of the liquid extracting pipe 8 and the second hydraulic cylinder 6 and the end part of the liquid pipe 9 close to the second hydraulic cylinder 6. Wherein a part of the check valve on the liquid extracting pipe 8 is sleeved in the inner hole of the pressure plate 14. The two check valves 15 function identically, both for preventing backflow of fluid, but in different positions or types.
Furthermore, both ends of the middle connecting pipe 2 are provided with internal threads for matching connection.
Further, a support guide seat 11 is arranged between the hydraulic end flange 5 and the middle connecting pipe 2, one end of the support guide seat 11 is matched in a flange hole of the hydraulic end flange 5, and the other end of the support guide seat 11 is matched in an inner cavity of the middle connecting pipe 2; the periphery of the support guide seat 11 is fixed with the hydraulic end flange 5 through bolts, so that the middle connecting pipe 2 can be connected and supported.
Example two:
the difference between the present embodiment and the first embodiment is that a specific structure of the hydraulic end flange is provided.
As shown in fig. 1 and fig. 2, an inclined hole channel penetrating through an end surface of the hydraulic end flange 5 is arranged on one side of the hydraulic end flange 5, the fluid pipe 9 is arranged in the inclined hole channel, and a thermal insulation material is filled between the fluid pipe 9 and the inclined hole channel; the cryogenic liquid moves through the fluid pipe 9 from near the middle of the hydraulic end flange 5 to far away from the middle of the hydraulic end flange 5.
The hydraulic end flange 5 completely avoids the contact between the fluid pipe 9 and the hydraulic end flange 5 by arranging the thermal insulation material in the gap between the fluid pipe 9 and the inclined hole channel, and the thermal resistance is increased by the thermal insulation material, so that when the low-temperature fluid passes through the fluid pipe 9, the rapid cooling of the hydraulic end flange 5 is not caused, thereby preventing the components in the middle of the hydraulic end flange 5 from being frozen, and reducing the moisture condensation and ice/frost accumulation around the components near the warm end 1 of the low-temperature pump.
Preferably, the heat insulation material is an RFC special-shaped heat insulation part which is divided into an upper section, a middle section and a lower section, and is convenient to fill the inclined hole channel and clamp the fluid pipe 9.
Further, an oil passage is arranged on the other side of the hydraulic end flange 5 and comprises a horizontal section and an inclined section which are communicated with each other; an internal thread structure is arranged on the outer circumferential surface of the horizontal section close to the hydraulic end flange 5 and is connected with an external oil pipe.
The obliquely arranged oil passage can reduce the flowing distance and the contact time of oil in the flange and improve the oil absorption and oil discharge efficiency; the horizontal section is a small section and is used for transitionally connecting an internal thread structure, and the internal thread structure is used for fixedly connecting an external oil pipe.
Further, the hydraulic end flange has a stepped bore (visible in fig. 2) formed therethrough at a central portion thereof, and the piston rod 12 passes through the stepped bore and is connected to the hydraulic end piston 10.
Example three:
the present embodiment is different from the first embodiment in that a specific structure of the sealing structure of the second piston is provided.
As shown in fig. 2, four sealing grooves are formed in the outer circumferential surface of the second piston 13, a plurality of circular holes are uniformly distributed in the sealing grooves along the radial direction of the second piston 13, and elastic sealing components are arranged in the sealing grooves; the sealing assembly comprises a sealing spring, a stepped elastic column and a sealing ring, the sealing spring and the stepped elastic column are arranged in the circular hole, and one end of the stepped elastic column is sleeved in the sealing spring; the sealing ring is arranged in the sealing groove, and the inner circumferential surface of the sealing ring is tightly attached to the other end of the stepped elastic column.
Under the matching of the sealing spring and the stepped elastic column, the sealing assembly can self-adaptively adjust the contact tightness degree of the sealing ring with the second piston 13 and the second hydraulic cylinder 6 according to environmental changes, and automatically stretch and tightly prop the sealing ring after the sealing ring is worn in long-term reciprocating motion, so that the effects of supplementing and offsetting wear are achieved, the service life of the sealing assembly is integrally prolonged, and the service life of the second piston 13 is prolonged; the elastic column of radial equipartition is more even when providing elastic action force, and the round hole setting of equipartition avoids offering too much inside accommodation space on second piston 13 to reduce second piston 13's intensity.
Further, an internal threaded hole is formed in the end of the second piston 13, and the internal threaded hole is used for being connected with the piston rod 12.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A three-section type cryogenic pump for high-pressure cryogenic liquid comprises a warm end, a middle connecting pipe and a cold end, and is characterized in that the warm end comprises a first hydraulic cylinder, and a hydraulic end piston and a piston rod are arranged in the first hydraulic cylinder; the first hydraulic cylinder is fixedly connected with one end of the middle connecting pipe through a hydraulic end flange; the piston rod penetrates through the hydraulic end flange and extends to the cold end along the inner cavity of the middle connecting pipe; the other end of the middle connecting pipe is connected with the cold end through a second flange; the cold end comprises a second hydraulic cylinder, a second piston is arranged in the second hydraulic cylinder, and the second piston is connected with the end part of the piston rod; one end, far away from the second flange, of the second hydraulic cylinder is connected with a liquid pumping pipe, a spring is sleeved on the liquid pumping pipe, a filter screen is sleeved at the pipe opening of the liquid pumping pipe, and the spring is wrapped by the filter screen; a discharge flow channel is arranged on the cylinder wall of the second hydraulic cylinder close to the liquid pumping pipe, and the discharge flow channel is connected with a liquid pipe outwards; the fluid pipe turns back to pass through the second flange and the hydraulic end flange.
2. The cryopump of claim 1, wherein a pressure plate is further provided at an end of the second cylinder, and the pressure plate is connected to and fixes the pumping pipe and the spring.
3. The cryopump of claim 1, wherein check valves are provided at the connection of the liquid extraction pipe and the second cylinder and at the location of the liquid pipe near the second cylinder.
4. The three-stage cryopump of claim 1, wherein both ends of the middle connection pipe are internally threaded for mating connection.
5. The three-stage cryopump of claim 1, wherein a support guide seat is provided between the hydraulic end flange and the middle connection pipe, one end of the support guide seat is fitted in a flange hole of the hydraulic end flange, and the other end of the support guide seat is fitted in an inner cavity of the middle connection pipe; the periphery of the supporting guide seat is fixed with the hydraulic end flange through bolts.
6. The three-stage cryogenic pump for high-pressure cryogenic liquid according to claim 1, wherein one side of the hydraulic end flange is provided with a slant hole channel penetrating through an end face of the hydraulic end flange, the fluid pipe is arranged in the slant hole channel, and a thermal insulation material is filled between the fluid pipe and the slant hole channel; the low-temperature liquid moves from the middle part close to the hydraulic end flange to the middle part far away from the hydraulic end flange through the fluid pipe.
7. The three-stage cryopump of claim 1, wherein an oil passage is provided on the other side of the hydraulic end flange, the oil passage comprising a horizontal section and an inclined section that are in communication; an internal thread structure is arranged on the outer circumferential surface of the horizontal section close to the hydraulic end flange and is connected with an external oil pipe in a fixed mode.
8. The three-stage cryopump of claim 1, wherein four sealing grooves are formed in the outer circumferential surface of the second piston, a plurality of circular holes are uniformly distributed in the sealing grooves along the radial direction of the second piston, and each sealing groove is provided with an elastic sealing component; the sealing assembly comprises a sealing spring, a stepped elastic column and a sealing ring, the sealing spring and the stepped elastic column are arranged in the circular hole, and one end of the stepped elastic column is sleeved in the sealing spring; the sealing ring is arranged in the sealing groove, and the inner circumferential surface of the sealing ring is tightly attached to the other end of the stepped elastic column.
9. The three-stage cryopump of claim 1, wherein a stepped hole is formed through the middle of the hydraulic end piston, and one end of the piston rod is screwed into the stepped hole; the end part of the second piston is provided with an internal thread hole, and the other end of the piston rod is screwed in the internal thread hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921552197.4U CN211116449U (en) | 2019-09-18 | 2019-09-18 | Three-section type cryogenic pump for high-pressure cryogenic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921552197.4U CN211116449U (en) | 2019-09-18 | 2019-09-18 | Three-section type cryogenic pump for high-pressure cryogenic liquid |
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| CN211116449U true CN211116449U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921552197.4U Active CN211116449U (en) | 2019-09-18 | 2019-09-18 | Three-section type cryogenic pump for high-pressure cryogenic liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542427A (en) * | 2022-04-26 | 2022-05-27 | 杭州新亚低温科技有限公司 | Zero suction pressure head cryogenic liquid pump |
-
2019
- 2019-09-18 CN CN201921552197.4U patent/CN211116449U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542427A (en) * | 2022-04-26 | 2022-05-27 | 杭州新亚低温科技有限公司 | Zero suction pressure head cryogenic liquid pump |
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