Pipeline connecting structure for helium compression device

Abstract

The utility model relates to the technical field of helium compression devices, in particular to a pipeline connecting structure for a helium compression device, which comprises a first connecting pipe fixed with the helium compression device, a second connecting pipe and a nut fixed at one end of the second connecting pipe. A sealing shell is arranged on the outer side of the first connecting pipe, the outer side of the second connecting pipe and the outer side of the nut, the sealing shell comprises a first shell body and a second shell body which are detachably connected, and the first shell body and the second shell body are mutually spliced to form a closed cavity wrapping the nut inside. A cavity is formed in the sealing shell, through holes for containing the first connecting pipe and the second connecting pipe and extending to the outside are formed in the two sides of the cavity in a penetrating mode, an indicating mechanism for displaying whether gas leaks or not is arranged in the sealing shell, when helium leakage occurs at the connecting position of the nut and the first connecting pipe, workers can deal with the helium leakage in time, and meanwhile overhaul and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of helium compression devices, in particular to a pipeline connection structure for helium compression devices. Background Art

[0002] Helium compressor is the driving unit of cryopump system or other refrigeration unit, used to provide high purity helium to cryopump or other refrigeration unit.

[0003] The existing helium compression device is used to transmit helium through a pipeline that is usually connected to a compressor using a nut. However, since the molecular weight of helium is very small, it is very easy to leak from the connection of the nut. Moreover, helium is colorless and odorless, and a slight leakage is not easy to detect. Moreover, since helium is a rare gas and is expensive, it is easy to cause economic losses inadvertently. In the Chinese Patent Literature Library, a patent with an authorization announcement number of CN219954621U discloses a helium compression device for hydrogen liquefaction. By sleeve-fitting a sealing sleeve and a limiting sleeve on the outer side of the nut, and arranging a pressure sensor in the sealing sleeve, whether helium leakage occurs at the pipeline connection can be monitored in real time. However, the nut connected to the pipeline is located inside the sealing sleeve and the limiting sleeve, which is not convenient for using tools to install and fix the nut, and is not very practical. Summary of the invention

[0004] The utility model aims to provide a pipeline connection structure for a helium compression device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipeline connection structure for a helium compression device, comprising a first connecting pipe fixed to the helium compression device, a second connecting pipe and a nut fixed to one end of the second connecting pipe, the nut being threadedly connected to one end of the first connecting pipe, a sealed shell being arranged on the outer sides of the first connecting pipe, the second connecting pipe and the nut, and the sealed shell comprising a first shell and a second shell that are detachably connected, the first shell and the second shell being spliced ​​with each other to form a closed cavity wrapping the nut inside, and through holes for accommodating the first connecting pipe and the second connecting pipe extending to the outside are arranged on both sides of the cavity, and an indicator mechanism showing whether gas is leaking is arranged inside the sealed shell.

[0006] Furthermore, the first shell and the second shell are spliced ​​together to form a regular polygonal prism.

[0007] Furthermore, connecting parts are provided at the edges of opposite ends of the first shell and the second shell, and mounting holes are provided on the connecting parts.

[0008] Furthermore, a positioning groove for limiting the sealing shell from sliding along its axis is provided on the outer side wall of the first connecting tube, the second connecting tube or the nut.

[0009] Furthermore, a limiting plate tightly fitting with the nut is fixed on the outer peripheral wall of the first connecting pipe.

[0010] Furthermore, the indicating mechanism includes a partition plate slidably arranged on the outside of the first connecting tube and a plurality of indicating rods fixed on the side of the partition plate away from the nut, the partition plate is slidably arranged inside the sealing shell along the axial direction of the sealing shell, and the partition plate divides the inside of the sealing shell into two independent cavities, a side plate of the sealing shell is penetrated by a clearance hole for accommodating the indicating rod extending to the outside of the sealing shell, and the partition plate is provided with an elastic reset member for pushing the indicating rod to separate from the clearance hole.

[0011] Furthermore, an expanded section with an increased size is provided at one end of the clearance hole close to the indicator rod.

[0012] Furthermore, a baffle for limiting the elastic reset member is slidably provided at one end of the indicating rod.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By providing a sealed housing and an indicating mechanism, when helium leakage occurs at the connection between the nut and the first connecting pipe, the staff can handle it in time;

[0015] By arranging the sealing shell into a split structure of the first shell and the second shell, disassembly and assembly are convenient, and the installation and connection of the nut are also convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 4 This is an explosion diagram of the utility model;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the indicating mechanism of the utility model.

[0021] In the figure: 1. first connecting tube; 101. limit plate; 2. second connecting tube; 3. nut; 4. sealing shell; 401. first shell; 402. second shell; 403. connecting part; 404. mounting hole; 405. clearance hole; 406. flaring section; 407. air hole; 5. indicating mechanism; 501. partition plate; 502. indicating rod; 5021. slide groove; 503. elastic reset member; 504. baffle; 5041. slider; 6. positioning groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the description of the utility model, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In order to make the terms "including" and any variations of them in the specification and claims of the utility model and the above-mentioned drawings, it is intended to cover non-exclusive inclusions.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does 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 therefore cannot be understood as a limitation on the present utility model.

[0024] See also Figure 1-5The utility model provides an embodiment: a pipeline connection structure for a helium compression device, comprising a first connecting pipe 1 fixed to the helium compression device, a second connecting pipe 2 and a nut 3 fixed to one end of the second connecting pipe 2, the nut 3 is threadedly connected to one end of the first connecting pipe 1, a limiting plate 101 tightly fitted with the nut 3 is fixed on the outer peripheral wall of the first connecting pipe 1, a sealing shell 4 is arranged outside the first connecting pipe 1, the second connecting pipe 2 and the nut 3, and the sealing shell 4 includes a first shell 401 and a second shell 402 that are detachably connected, and the first shell 401 and the second shell 402 are spliced ​​with each other to form a nut 3. The sealed cavity is wrapped inside, and through holes are provided on both sides of the cavity to accommodate the first connecting pipe 1 and the second connecting pipe 2 extending to the outside. Specifically, the edges of the first shell 401 and the second shell 402 at opposite ends are provided with connecting parts 403, and the connecting parts 403 are provided with mounting holes 404. When in use, the two connecting parts 403 can be fixed by bolts and nuts. Furthermore, sealing gaskets are provided on the abutting surfaces of the first shell 401 and the second shell 402 to improve the sealing performance. The first shell 401 and the second shell 402 can also be hinged at one end as needed, and the other end is set to be fixed with bolts and nuts;

[0025] A positioning groove 6 for limiting the sliding of the sealing shell 4 along its axis is provided on the outer wall of the first connecting tube 1, the second connecting tube 2 or the nut 3. In this embodiment, the positioning groove 6 is provided on the outer wall of the nut 3. One end of the first shell 401 and the second shell 402 are inserted into the positioning groove 6 to limit the axial direction of the two, thereby preventing the sealing shell 4 from sliding on the outer side of the nut 3.

[0026] The inside of the sealed shell 4 is provided with an indication mechanism 5 for indicating whether the gas is leaking. Specifically, the indication mechanism 5 includes a partition plate 501 slidably arranged on the outside of the first connecting pipe 1 and a plurality of indication rods 502 fixed on the side of the partition plate 501 away from the nut 3. The partition plate 501 is slidably arranged inside the sealed shell 4 along the axial direction of the sealed shell 4, and the partition plate 501 divides the inside of the sealed shell 4 into two independent cavities. A clearance hole 405 for accommodating the indication rod 502 and extending to the outside of the sealed shell 4 is penetrated on the side plate of the sealed shell 4. An elastic reset member 503 for pushing the indication rod 502 to separate from the clearance hole 405 is provided on the partition plate 501. In order to improve the sealing performance, a spring 503 can be provided on the side of the partition plate 501. A sealing gasket is provided on the edge, and the sealing gasket fits tightly with the inner wall of the sealing shell 4 to prevent gas from flowing between the two chambers. In the present embodiment, one indicating rod 502 is provided, which is arranged on one side inside the first shell 401. Furthermore, multiple indicating rods 502 can be provided as needed. For the convenience of disassembly and assembly, only the first shell 401 or the second shell 402 is provided. The elastic reset member 503 is specifically a spring sleeved on the outside of the indicating rod 502, which pushes the partition plate 501 to move toward the end close to the nut 3, so that the indicating rod 502 is separated from the giving hole 405. Under normal circumstances, under the elastic support of the spring, the indicating rod 502 is separated from the giving hole 405. When leakage occurs at the connection between the nut 3 and the first connecting pipe 1, refer to the attached Figure 1 , the air pressure in the right chamber of the partition plate 501 increases, pushing the partition plate 501 to move to the left. In order to facilitate the movement of the partition plate 501, an air hole 407 can be set through the left side plate of the first shell 401 or the second shell 402, or the size of the clearance hole 405 can be set to be larger than the size of the indicator rod 502, so that the left chamber is connected to the outside. The indicator rod 502 extends to the outside through the clearance hole 405. The staff can know in time that helium leakage has occurred at the connection, remove the bolts at the connection part 403, and then remove the second shell 402, and then replace the connection at the connection or directly tighten it. The structure is simple and practical, and the equipment cost is reduced;

[0027] In this embodiment, an end of the clearance hole 405 close to the indicator rod 502 is provided with an enlarged expansion section 406 to facilitate the insertion of the indicator rod 502 into the clearance hole 405;

[0028] In this embodiment, the first shell 401 and the second shell 402 are spliced ​​together to form a regular polygonal prism, which can play a role in limiting and preventing the partition plate 501 from rotating inside the sealed housing 4, causing the indicator rod 502 to be misaligned with the clearance hole 405;

[0029] In one embodiment, a baffle 504 is slidably provided at one end of the indicator rod 502 for limiting the elastic reset member 503. Figure 5The baffle plate 504 is slidably connected to the indicator rod 502 through a slider 5041. One end of the baffle plate 504 is flush with one end of the indicator rod 502. A slide groove 5021 matching the slider 5041 is provided on the indicator rod 502 along its length direction. After the elastic return member 503 is sleeved on the outer side of the indicator rod 502, one end abuts against the partition plate 501 and the other end abuts against the baffle plate 504 to prevent the elastic return member 503 from being separated from the indicator rod 502 and being lost.

[0030] Working principle: During operation, the nut 3 is threadedly connected to one end of the first connecting tube 1 until the limit plate 101 abuts against the end face of the nut 3, and then the partition plate 501 is slid to be close to the limit plate 101, and the first shell 401 and the second shell 402 are wrapped around the outside of the nut 3, and one end of the first shell 401 and the second shell 402 is inserted into the interior of the positioning groove 6, and the first shell 401 and the second shell 402 are fixedly connected by bolts and nuts. During use, when leakage occurs at the connection between the first connecting tube 1 and the nut 3, the air pressure on the right side inside the sealing shell 4 increases, pushing the partition plate 501 to move to the side away from the nut 3, compressing the elastic reset part 503, and the indicator rod 502 is inserted into the interior of the make way hole 405 and extends to the outside of the sealing shell 4. By observing the position of the indicator rod 502, it is possible to infer whether there is leakage at the connection between the nut 3 and the first connecting tube 1. When leakage occurs, the staff can deal with it in time.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A pipeline connection structure for a helium compression device, comprising a first connecting pipe (1) fixed to the helium compression device, a second connecting pipe (2) and a nut (3) fixed to one end of the second connecting pipe (2), wherein the nut (3) is threadedly connected to one end of the first connecting pipe (1), characterized in that: A sealed housing (4) is arranged outside the first connecting tube (1), the second connecting tube (2) and the nut (3), and the sealed housing (4) comprises a first shell (401) and a second shell (402) which are detachably connected, the first shell (401) and the second shell (402) being spliced ​​together to form a sealed cavity enclosing the nut (3) inside, and through holes are arranged on both sides of the cavity to accommodate the first connecting tube (1) and the second connecting tube (2) and extend to the outside, and an indication mechanism (5) for indicating whether gas is leaking is arranged inside the sealed housing (4).

2. The pipeline connection structure for a helium compression device according to claim 1, characterized in that: The first shell (401) and the second shell (402) are spliced ​​together to form a regular polygonal prism.

3. The pipeline connection structure for a helium compression device according to claim 1, characterized in that: A connecting portion (403) is provided at the edge of the opposite end of the first shell (401) and the second shell (402), and a mounting hole (404) is provided on the connecting portion (403).

4. The pipeline connection structure for a helium compression device according to claim 1, characterized in that: A positioning groove (6) for limiting the sealing housing (4) from sliding along its axis is provided on the outer side wall of the first connecting tube (1), the second connecting tube (2) or the nut (3).

5. The pipeline connection structure for a helium compression device according to claim 1, characterized in that: A limiting plate (101) which fits tightly with the nut (3) is fixed on the outer peripheral wall of the first connecting tube (1).

6. The pipeline connection structure for a helium compression device according to claim 1, characterized in that: The indicating mechanism (5) comprises a partition plate (501) slidably arranged on the outside of the first connecting tube (1) and a plurality of indicating rods (502) fixed on a side of the partition plate (501) away from the nut (3); the partition plate (501) is slidably arranged inside the sealing shell (4) along the axial direction of the sealing shell (4); the partition plate (501) divides the inside of the sealing shell (4) into two mutually independent cavities; a clearance hole (405) for accommodating the indicating rod (502) and extending to the outside of the sealing shell (4) is penetrated on the side plate of the sealing shell (4); and an elastic reset member (503) for pushing the indicating rod (502) to separate from the clearance hole (405) is provided on the partition plate (501).

7. The pipeline connection structure for a helium compression device according to claim 6, characterized in that: An expanded section (406) with an increased size is provided at one end of the clearance hole (405) close to the indicator rod (502).

8. The pipeline connection structure for a helium compression device according to claim 6, characterized in that: A baffle (504) for limiting the position of the elastic reset member (503) is slidably provided at one end of the indicating rod (502).

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