CN211118142U

CN211118142U - Flange structure for hydraulic end of cryogenic pump

Info

Publication number: CN211118142U
Application number: CN201921552177.7U
Authority: CN
Inventors: 李晓峰
Original assignee: Zhangjiagang Ruijing Power Technology Co ltd
Current assignee: Zhangjiagang Ruijing Power Technology Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-07-28
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a flange structure for a hydraulic end of a cryogenic pump, which comprises a first end surface and a second end surface, wherein one side of the flange structure is provided with an inclined hole channel which runs through the first end surface and the second end surface, and the inclined hole channel is used for arranging a conveying pipe; the inclined hole channel is arranged close to the first end face and the second end face in a stepped counter bore mode, and the diameter of the middle of the inclined hole channel is smaller than the diameter of the two ends of the inclined hole channel; the conveying pipe and the middle part of the inclined hole channel form a sealed space, and sealing parts are arranged at two ends of the conveying pipe; the sealed space is filled with a heat insulation material or heat insulation gas or vacuum; a heat insulation piece is arranged in the stepped counter bore and is clamped with the sealing piece and the conveying pipe; the flange structure avoids the contact between the conveying pipe and the flange, increases thermal resistance through the thermal insulation material and the thermal insulation piece, avoids the cooling of the flange, and effectively reduces the moisture condensation and ice/frost accumulation around the assembly near the warm end of the cryopump.

Description

Flange structure for hydraulic end of cryogenic pump

Technical Field

The utility model relates to cryogenic pump flange structure technical field, concretely relates to flange structure for cryogenic pump hydraulic pressure end.

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. Therefore, there will be a low temperature cold junction and warm end (hydraulic pressure end) of normal atmospheric temperature when cryogenic pump pumps liquid, cryogenic pump (see description attached drawing 1) cold junction 1 existing takes out cryogenic liquid from storage container, cryogenic liquid moves to warm end 3 along conveyer pipe 2, can pass through a flange 4, flange 4 below is equipped with the piston structure of warm end, cryogenic fluid lasts when the process flange, because cryogenic conduction, can be quick with the flange cooling, make the piston structure temperature at middle part reduce fast, thereby can influence its normal work, consequently need design a structure and avoid cryogenic fluid to influence the part of warm end.

As disclosed in the chinese invention patent (publication No. CN104279140B) in 2018, a flange for a pump includes a first face and a second face and a channel for a process fluid tube extending from the first face to the second face; the channel comprises a first portion having a first diameter and a second portion having a second diameter greater than the first diameter; when the process fluid pipe extends through the channel, there is a gap between an inner wall of the second portion of the channel and the process fluid pipe. The gap increases a thermal resistance between the process fluid tube and the flange, thereby reducing cooling of the warm end of the pump, as compared to an arrangement in which the second diameter is equal to the first diameter. The process fluid pipe in the flange is still fixed to the flange by means of a weld, but the contact area between the pipe and the flange is reduced, the low temperature is transmitted to the whole flange through the contact area, and the warm end is cooled. Moisture in the air surrounding the gap may condense and frost and ice build-up may occur.

Disclosure of Invention

The utility model aims at providing a flange structure for cryogenic pump hydraulic pressure end to the problem that prior art exists.

In order to achieve the above object, the utility model adopts the following technical scheme:

a flange structure for a hydraulic end of a cryogenic pump comprises a first end face and a second end face, wherein one side of the flange structure is provided with an inclined hole channel penetrating through the first end face and the second end face, and the inclined hole channel is used for arranging a conveying pipe; the inclined hole channel is arranged close to the first end face and the second end face in a stepped counter bore mode, and the diameter of the middle of the inclined hole channel is smaller than the diameter of the two ends of the inclined hole channel; the conveying pipe and the middle part of the inclined hole channel form a sealed space, and sealing parts are arranged at two ends of the conveying pipe; the sealed space is filled with a heat insulation material or heat insulation gas or vacuum; and a heat insulation piece is arranged in the stepped counter bore and is clamped with the sealing piece and the conveying pipe.

The flange structure completely avoids the contact between the conveying pipe and the flange by arranging the heat insulation material and the heat insulation piece in the gap between the conveying pipe and the inclined hole channel, and increases the thermal resistance by the heat insulation material and the heat insulation piece, so that the flange can not be cooled when low-temperature fluid passes through the conveying pipe, thereby preventing the hydraulic fluid in a piston cylinder in the middle of the flange from being frozen, and reducing the moisture condensation and ice/frost accumulation around a component near the warm end of the low-temperature pump.

Compared with the existing channel, the conveying pipe is not contacted with the flange completely, and the low-temperature transmission is greatly reduced.

The sealed space is filled with heat insulation materials or heat insulation gas or is vacuum, the heat insulation effect is better than that of pure air, and moisture in the air does not need to be worried about water outlet when meeting.

The heat insulation pieces with the stepped two ends can fix the sealing piece and the conveying pipe, and the conveying pipe is not required to be fixed in a welding, mechanical arrangement or bonding mode.

The arrangement of the inclined hole channel can enable the stepped counter bore close to the warm end to be farther away from the central axis than the stepped counter bore close to the low-temperature end.

Furthermore, an oil passage is arranged on the other side of the flange structure and comprises a horizontal section and an inclined section which are communicated with each other; and an internal thread structure is arranged at the position, close to the outer circumferential surface of the flange, of the horizontal section.

Further, the length of the inclined section is greater than that of the horizontal section; the included angle between the horizontal section and the inclined section is larger than 90 degrees.

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.

Further, the outer contour of the temperature insulation piece is matched with the inner contour of the stepped counter bore; the thermal insulation piece is arranged in the stepped counter bore in an interference fit mode or is fixed in a screw joint or gluing mode. The heat insulation piece with the matched profile is convenient for mounting and plugging the stepped counter bores on the two end faces.

Furthermore, an inclined through hole is formed in the middle of the heat insulation piece, and the inclination of the inclined through hole is consistent with that of the inclined hole channel; the diameter of the inclined through hole is smaller than the outer diameter of the conveying pipe so as to achieve the purposes of interference fit and fixing of the conveying pipe.

Further, the inner end face of the stepped counter bore is perpendicular to the inclined hole channel; the sealing member is disposed in a radial direction of the delivery pipe. The sealing assembly can be a structure that a sealing ring is matched with sealing glue, or an annular sealing plug.

Further, the heat insulation material is one of mineral wool fiber, foam particles, foam plastics, superfine glass wool and high silicon-oxygen cotton; the temperature insulating gas is inert gas, such as argon or xenon.

Further, the thermal insulation piece is an integrally formed RFC special-shaped thermal insulation piece or a porous foam plastic or polytetrafluoroethylene piece. The heat insulation materials are convenient to machine and form, and can be quickly integrally formed by combining the stepped counter bore profile with a simple structure, so that the manufacturing cost is reduced.

Further, the middle part of the flange structure is provided with a flange hole for installation. The flange hole is used for connecting the piston cylinder assembly.

A cryopump including a flange structure as described in any one of the above; the low-temperature liquid moves from the middle part close to the flange structure to the middle part far away from the flange structure through the conveying pipe.

Compared with the prior art, the beneficial effects of the utility model are that: 1. the flange structure for the hydraulic end of the cryogenic pump completely avoids the contact between the conveying pipe and the flange, increases thermal resistance through the thermal insulation material and the thermal insulation piece, avoids the cooling of the flange, and reduces the moisture condensation and ice/frost accumulation around the assembly near the warm end of the cryogenic pump;

2. the sealed space is filled with heat insulation materials or heat insulation gas or is vacuum, the heat insulation effect is better than that of pure air, and the moisture in the air does not need to be worried about water outlet when meeting the energy;

3. 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 small-section horizontal section is convenient for arranging an internal thread structure so as to be fixedly connected with an external oil pipe;

4. the heat insulation piece is easy to obtain in material, simple in structure and easy to integrally form, and the manufacturing cost is low.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a prior art cryopump;

fig. 2 is a schematic structural diagram of a flange structure for a hydraulic end of a cryogenic pump according to the present invention;

fig. 3 is an enlarged schematic view of a flange structure at a position a for a hydraulic end of a cryogenic pump according to the present invention;

in the figure: 1. a cold end; 2. a delivery pipe; 3. warming the end; 4. a flange; 5. a first end face; 6. a second end face; 7. an inclined hole channel; 8. a first stepped counterbore; 9. a second stepped counterbore; 10. an oil passage; 11. an internally threaded bore; 12. a horizontal segment; 13. an inclined section; 14. a flange hole; 15. a thermal insulation member; 16. sealing the space; 17. and a seal.

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.

The first embodiment is as follows:

as shown in fig. 2 to 3, a flange structure for a hydraulic end of a cryogenic pump includes a first end surface 5 and a second end surface 6 that are parallel to each other, one side of the flange structure is provided with an inclined hole channel 7 that penetrates through the first end surface 5 and the second end surface 6, and the inclined hole channel 7 is used for installing a conveying pipe 2; a first stepped counter bore 8 and a second stepped counter bore 9 are respectively arranged on the inclined hole channel 7 close to the first end face 5 and the second end face 6, and the diameter of the middle part of the inclined hole channel 7 is smaller than that of the two ends; the middle parts of the conveying pipe 2 and the inclined hole channel 7 form a sealed space 16, and sealing parts 17 are arranged at two ends of the sealed space; the gap between the sealed space 16 and the conveying pipe 2 is filled with heat insulation particles and argon; and the first stepped counter bore 8 and the second stepped counter bore 9 are both provided with a heat insulation piece 15, and the heat insulation piece 15 is clamped with the sealing piece 17 and the conveying pipe 2.

According to the flange structure, the thermal insulation material and the thermal insulation piece are arranged between the conveying pipe 2 and the inclined hole channel 7, so that the conveying pipe 2 is prevented from being in direct contact with the flange 4, thermal resistance is increased through the thermal insulation material and the thermal insulation piece, and when low-temperature fluid passes through the conveying pipe 2, the flange 4 is not cooled, so that hydraulic fluid in a piston cylinder in the middle of the flange 4 is prevented from being frozen, and moisture condensation and ice/frost accumulation around a component near a warm end of a low-temperature pump are reduced.

The sealed space 16 is filled with heat insulation particles and argon, the heat insulation effect is better than that of pure air, and the worry that moisture in the air can come out when meeting water is avoided.

The heat insulating piece 15 with the two stepped ends can fix the sealing piece 17 and the conveying pipe 2 without additionally adopting a welding, mechanical arrangement or bonding mode to fix the conveying pipe.

The arrangement of the inclined hole channel 7 can enable the first stepped counter bore 8 close to the warm end to be farther from the central axis than the second stepped counter bore 9 close to the low-temperature end, and the transmission distance between the first stepped counter bore 8 and the middle of the flange is increased.

Further, an oil passage 10 is arranged on the other side of the flange structure, and the oil passage 10 comprises a horizontal section 12 and an inclined section 13 which are communicated with each other; and an internal threaded hole 11 is formed in the horizontal section 12 close to the outer circumferential surface of the flange structure.

Further, the length of the inclined section 13 is greater than that of the horizontal section 12; the included angle between the horizontal section 12 and the inclined section 13 is 120 degrees.

The obliquely arranged oil passage 10 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 12 is a small section and is used for transitionally connecting with the structure of the internal thread hole 11, and the internal thread structure is used for fixedly connecting with an external oil pipe.

Further, the outer contour of the thermal insulation piece 15 is matched with the inner contour of the first stepped counter bore 8 and the inner contour of the second stepped counter bore 9 respectively; the thermal insulation piece 15 is arranged in the stepped counter bore in an interference fit mode. The heat insulation piece 15 with the matched contour is convenient for installing and blocking the stepped counter bores on the two end faces.

Further, the inner end faces of the first stepped counter bore 8 and the second stepped counter bore 9 are arranged perpendicular to the inclined hole channel 7, and the sealing member 17 is arranged at the end part; the seal 17 is arranged in the radial direction of the feed pipe 2. The sealing member 17 may be a sealing ring structure matched with a sealant.

Further, the heat insulation particles are porous foam particles; the porous structure may store argon gas.

Further, separate the thermal-insulated piece for integrated into one piece's RFC dysmorphism heat insulating part, the machine-shaping of being convenient for combines simple structure's ladder counter bore profile, and integrated into one piece that can be quick reduces manufacturing cost.

Further, the middle portion of the flange structure has a flange hole 14 for mounting. The flange bore 14 is used to connect the piston cylinder assembly.

Example two:

a cryopump that includes the flange structure described in the first embodiment; the low-temperature liquid moves from the middle part close to the flange structure to the middle part far away from the flange structure through the conveying pipe.

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

1. A flange structure for a hydraulic end of a cryogenic pump comprises a first end face and a second end face, and is characterized in that one side of the flange structure is provided with an inclined hole channel penetrating through the first end face and the second end face, and the inclined hole channel is used for arranging a conveying pipe; the inclined hole channel is arranged close to the first end face and the second end face in a stepped counter bore mode, and the diameter of the middle of the inclined hole channel is smaller than the diameter of the two ends of the inclined hole channel; the conveying pipe and the middle part of the inclined hole channel form a sealed space, and sealing parts are arranged at two ends of the conveying pipe; the sealed space is filled with a heat insulation material or heat insulation gas or vacuum; and a heat insulation piece is arranged in the stepped counter bore and is clamped with the sealing piece and the conveying pipe.

2. The flange structure of the hydraulic end of the cryogenic pump according to claim 1, wherein an oil passage is formed in the other side of the flange structure, and the oil passage comprises a horizontal section and an inclined section which are communicated with each other; and an internal thread structure is arranged at the position, close to the outer circumferential surface of the flange, of the horizontal section.

3. The flange structure of a hydraulic end of a cryopump as claimed in claim 2, wherein the length of said sloped section is greater than the length of said horizontal section; the included angle between the horizontal section and the inclined section is larger than 90 degrees.

4. The flange structure of a hydraulic end of a cryogenic pump according to claim 1, wherein an outer profile of the thermal barrier is adapted to an inner profile of the stepped counterbore; the thermal insulation piece is arranged in the stepped counter bore in an interference fit mode.

5. The flange structure of the hydraulic end of the cryogenic pump according to claim 1, wherein an inclined through hole is formed in the middle of the thermal insulation member, and the inclination of the inclined through hole is consistent with that of the inclined hole channel; the diameter of the inclined through hole is smaller than the outer diameter of the conveying pipe.

6. The flange structure of a hydraulic end of a cryogenic pump according to claim 1, wherein an inner end face of the stepped counterbore is arranged perpendicular to the inclined bore channel; the sealing member is disposed in a radial direction of the delivery pipe.

7. The flange structure of the hydraulic end of the cryogenic pump according to claim 1, wherein the thermal insulation material is one of mineral wool fibers, foam particles, foam plastics, ultra-fine glass wool and high-silicon-oxygen wool; the heat insulation gas is inert gas.

8. The flange structure of the hydraulic end of the cryogenic pump according to claim 1, wherein the thermal insulation member is an integrally formed RFC-shaped thermal insulation member or a porous foam or polytetrafluoroethylene member.

9. The flange structure of a hydraulic end of a cryopump as claimed in claim 1, wherein a central portion of the flange structure has a flange hole for mounting.

10. A cryopump, comprising the flange structure according to any one of claims 1 to 9; the low-temperature liquid moves from the middle part close to the flange structure to the middle part far away from the flange structure through the conveying pipe.