CN213016668U

CN213016668U - Mechanical sealing device for cryogenic pump

Info

Publication number: CN213016668U
Application number: CN202021907151.2U
Authority: CN
Inventors: 陈鸿燊
Original assignee: Wuxi Rongli Industrial Gas Co ltd
Current assignee: Wuxi Rongli Industrial Gas Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-04-20
Anticipated expiration: 2030-09-03

Abstract

The application discloses a mechanical sealing device for a cryopump, which comprises a cold air head and a cold air supply pipe arranged in the cold air head, wherein the top of the cold air supply pipe is provided with a butt-joint sealing pipe orifice positioned in the cold air head, the top of the cold air head is provided with a flange end cover in a matching way, and the lower part of the flange end cover is formed with a lantern ring connecting part; the cooling air head is characterized in that a notch is formed in the outer side face of the cooling air head, the lower portion of the notch is an arc opening, the upper portion of the notch is an open straight opening, a flexible ferrule is clamped on the notch, a screw rod assembly is horizontally matched on the flexible ferrule, and a ferrule connecting portion of the lower portion of the flange end cover is fixedly connected to the notch through the screw rod assembly. The utility model discloses an aim at carries out the flexonics to the mechanical flange coupling mechanism at air conditioning top, adopts flexible lasso to carry out the pad connection, with the flexible fixed connection of flange overhead at air conditioning, even under the cooling deformation condition, flexible lasso can be so that the flange is comparatively loose, is unlikely to excessive tensioning and stress deformation. The flexible ferrule can be tensioned and sealed at any time.

Description

Mechanical sealing device for cryogenic pump

Technical Field

The application relates to the technical field of cryogenic pump sealing, in particular to a mechanical sealing device for a cryogenic pump.

Background

The purpose of the cryogenic hydraulic pump is to transport cryogenic liquid from a location with low pressure to a location with high pressure, which in an air separation plant functions only as: for liquid circulation; or liquid may be drawn from a reservoir and forced into a vaporizer for vaporization and delivery to a user.

The low-temperature hydraulic pump comprises refrigeration equipment and a cold air diversion device, wherein the cold air diversion device is used for conveying liquid cold air provided by the refrigeration equipment, and a cold air head on the cold air diversion device is connected to a pipe orifice flange needing cold air supply so as to convey the liquid cold air.

As those skilled in the art will appreciate, mechanical flange connections may exist between some cryopumps and external equipment, and mechanical seals are highly desirable for cryogenic environments, taking into account stress distortion during cryogenic environments and cryogenic return chambers. If the flange connection parts deform, the connection sealing performance of the cryopump is affected, and leakage may occur.

SUMMERY OF THE UTILITY MODEL

It is a primary object of the present application to provide a mechanical seal for a cryopump that addresses the current problems.

In order to achieve the above object, the present application provides the following techniques:

a mechanical sealing device for a cryogenic pump comprises a cold air head and a cold air supply pipe arranged in the cold air head, wherein the top of the cold air supply pipe is provided with a butt sealing pipe orifice positioned in the cold air head, the top of the cold air head is provided with a flange end cover in a matching way, and the lower part of the flange end cover is formed with a lantern ring connecting part; the cooling air head is characterized in that a notch is formed in the outer side face of the cooling air head, the lower portion of the notch is an arc opening, the upper portion of the notch is an open straight opening, a flexible ferrule is clamped on the notch, a screw rod assembly is horizontally matched on the flexible ferrule, and a ferrule connecting portion of the lower portion of the flange end cover is fixedly connected to the notch through the screw rod assembly.

Furthermore, an arc-shaped gasket matched with a screw rod of the screw rod assembly is further arranged on the outer side face of the lantern ring connecting part at the lower part of the flange end cover.

Furthermore, an annular groove is formed in the outer side face of the flexible ferrule and is matched and clamped at the notch.

Furthermore, the inner side surface and the outer side surface of the flexible ferrule are both arc-shaped surfaces.

Furthermore, a flexible waterproof sleeve sealing ring is matched at the central hole of the flange end cover.

Furthermore, a gasket with a positioning connecting screw rod is arranged on the upper end face of the flange end cover.

Furthermore, more than six notches are uniformly arranged on the outer side surface of the cold air head on the circumference of the notch.

Compared with the prior art, this application can bring following technological effect:

the utility model discloses an aim at carries out the flexonics to the mechanical flange coupling mechanism at air conditioning top, adopts flexible lasso to carry out the pad connection, with the flexible fixed connection of flange overhead at air conditioning, even under the cooling deformation condition, flexible lasso can be so that the flange is comparatively loose, is unlikely to excessive tensioning and stress deformation. The flexible ferrule can be tensioned and sealed at any time.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic side view of the cooling head of fig. 1 according to the present invention;

FIG. 3 is a side view of the flexible ferrule of FIG. 1 of the present invention;

in the figure: 2. the air conditioner comprises an air conditioner supply pipe, 3, an air conditioner head, 4, a butt joint sealing pipe orifice, 5, a flexible ferrule, 6, an arc gasket, 7, a flange end cover, 8, a gasket, 9, a positioning connecting screw rod, 10, a flexible waterproof sleeve sealing ring, 11, an arc nut, 12 and a notch.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

In addition, the term "plurality" shall mean two as well as more than two.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

A mechanical sealing device for a cryopump comprises a cold air head 3 and a cold air supply pipe 2 arranged inside the cold air head 3, wherein a butt-joint sealing pipe orifice 4 positioned inside the cold air head 3 is arranged at the top of the cold air supply pipe 2, a flange end cover 7 is arranged at the top of the cold air head 3 in a matching way, and a lantern ring connecting part is formed at the lower part of the flange end cover 7; the cold air head is characterized in that a notch 12 is formed in the outer side face of the cold air head 3, the lower portion of the notch 12 is an arc opening, the upper portion of the notch is an open straight opening, a flexible ferrule 5 is clamped on the notch 12, the flexible ferrule 5 is horizontally matched with a screw rod assembly, and a lantern ring connecting portion of the lower portion of the flange end cover 7 is fixedly connected to the notch 12 through the screw rod assembly.

The utility model discloses an aim at carries out flexonics to the mechanical flange coupling mechanism at 3 tops of air conditioning head, adopts flexible lasso 5 to carry out the pad connection, with the flexible fixed connection of flange on air conditioning head 3, even under the cooling deformation condition, flexible lasso 5 can be so that the flange is comparatively loose, be unlikely to excessive tensioning and stress deformation. The flexible collar 5 can be tightened to seal at any time.

As shown in fig. 1, 2 and 3, a sealing connection flange structure special for a cryogenic liquid pump comprises a cold air head 3 and a cold air supply pipe 2 arranged inside the cold air head 3, wherein a butt-joint sealing pipe orifice 3 positioned inside the cold air head 3 is arranged at the top of the cold air supply pipe 2, refrigeration equipment is connected below the cold air head 2, the cold air supply pipe 2 is arranged inside the cold air head 3, a butt-joint sealing pipe orifice 4 is arranged at the top of the cold air supply pipe 2, and a collecting and distributing output valve connected with the cold air supply pipe 2 is arranged in the butt-joint sealing pipe orifice 4; the refrigeration equipment is mainly used for supplying low-temperature liquid and conveying the low-temperature liquid to the cold air head 3 through the cold air supply pipe, the butt joint sealing pipe orifice 4 is used for being sleeved on external air-entrapping equipment such as a liquid oxygen cylinder, and when liquid oxygen is filled, the butt joint sealing pipe orifice 4 is sleeved on the oxygen cylinder orifice to avoid leakage.

The top of the cold air head 3 is provided with a flange end cover 7 in a matching way, as shown in figure 1, the lower part of the flange end cover 7 is formed with a lantern ring connecting part which is of an annular structure, the diameter of the lantern ring connecting part is larger than the outer diameter of the cold air head 3, the cold air head and the flange end cover are in isolated connection, and a buffer space is left; as shown in the attached drawing 2, a notch 12 is formed in the outer side surface of the cold air head 3, the lower portion of the notch 12 is an arc opening, the upper portion of the notch is an open straight opening, a flexible ferrule 5 is clamped on the notch 12, the flexible ferrule 5 is made of flexible polymer composite rubber with good sealing performance and is clamped on the notch 12, a screw assembly is horizontally matched on the flexible ferrule 5, and a screw of the screw assembly horizontally penetrates through the flexible ferrule 5 to be fixedly connected with a lantern ring connecting portion at the lower portion of the flange end cover 7 at the position of the notch 12. When the flange is connected with the flange of external equipment such as an oxygen cylinder, the flexible ferrule 5 cannot be excessively compressed. Excessive tension is avoided.

The inside nut custom-made processing of screw rod subassembly, for arc nut 11, need the cooperation on 3 medial surfaces of air conditioning head.

Further, an arc-shaped gasket 6 matched with a screw rod of the screw rod assembly is further arranged on the outer side face of the lantern ring connecting part at the lower part of the flange end cover 7.

The arc gasket 6 is used for being matched with the nut at the other end of the arc nut 11 for installation. The arc gasket 6 is attached to the outer side face of the lantern ring connecting part at the lower part of the flange end cover 7.

Further, the outer side surface of the flexible ferrule 5 is provided with a ring groove which is matched and clamped at the notch 12.

As shown in fig. 2 and 3, the ring groove is integrally formed on the outer side surface of the flexible ferrule 5, and two end surfaces of the flexible ferrule 5 are in a circular ring structure and are clamped on the inner side surface and the outer side surface of the notch 12.

Further, the inner side and the outer side of the flexible ferrule 5 are both arc-shaped surfaces. The inner side and the outer side of the flexible ferrule 5 are both arc surfaces, and the flexible ferrule can be connected on the inner side and the outer side of the cold air head 3 in a better matching mode.

Further, a flexible waterproof sleeve sealing ring 10 is matched at the central hole of the flange end cover 7. The type of the flexible waterproof sleeve sealing ring 10 is not limited, and the flexible waterproof sleeve sealing ring is matched with a central hole of the flange end cover 7 and can be used as a connecting and reinforcing action piece when a flange of an oxygen cylinder is connected.

Furthermore, a gasket 8 with a positioning connecting screw rod 9 is arranged on the upper end surface of the flange end cover 7. The positioning connecting screw 9 is of a screw structure, is vertically matched on the upper end face of the flange end cover 7, and is matched with the gasket 8. Three positioning connecting screw rods 9 are uniformly arranged on the circumference, and the oxygen cylinder flange can be connected and positioned.

Furthermore, more than six notches 12 are uniformly arranged on the outer side surface of the cold air head 3 along the circumference. Six notches 12 are uniformly arranged on the outer side surface of the cold air head 3 along the circumference.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mechanical sealing device for a cryogenic pump comprises a cold air head (3) and a cold air supply pipe (2) arranged inside the cold air head (3), wherein a butt joint sealing pipe orifice (4) positioned inside the cold air head (3) is installed at the top of the cold air supply pipe (2), and is characterized in that a flange end cover (7) is installed at the top of the cold air head (3) in a matched mode, and a lantern ring connecting part is formed at the lower part of the flange end cover (7); the cold air head is characterized in that a notch (12) is formed in the outer side face of the cold air head (3), the lower portion of the notch (12) is an arc opening, the upper portion of the notch is an open straight opening, a flexible ferrule (5) is clamped on the notch (12), the flexible ferrule (5) is horizontally matched with a screw rod assembly, and a lantern ring connecting portion of the lower portion of the flange end cover (7) is fixedly connected to the notch (12) through the screw rod assembly.

2. A mechanical seal for a cryopump as claimed in claim 1 wherein the flange end cap (7) has an arcuate gasket (6) on the outside of the collar connection at the lower part which engages the screw of the screw assembly.

3. A mechanical seal for a cryopump as claimed in claim 1 or 2 wherein the flexible collar (5) has a circumferential groove on its outer face which engages over the notch (12).

4. A mechanical seal for a cryopump as claimed in claim 3 wherein the inner and outer sides of the flexible collar (5) are arcuate.

5. A mechanical seal for a cryogenic pump according to claim 1 or 4 characterised in that a flexible waterproof grommet seal (10) is fitted at the central aperture of the flange end cap (7).

6. A mechanical seal for a cryopump as claimed in claim 5 wherein the flange end cap (7) is further provided on its upper end face with a gasket (8) with a locating connection screw (9).

7. A mechanical seal for a cryopump as claimed in claim 6 wherein there are more than six notches (12) evenly provided around the circumference on the outside of the coldhead (3).