Sealing structure for liquid nitrogen pump

Abstract

The utility model discloses a sealing structure for a liquid nitrogen pump, which relates to the technical field of liquid nitrogen pumps and comprises a first connecting disc integrally formed on a first connecting pipe and a second connecting disc integrally formed on a second connecting pipe. A through groove is formed in the top of the first connecting disc in a penetrating mode, a first sealing ring is arranged in the through groove, a first annular groove and a second annular groove are formed in the bottom of the second connecting disc, and a second sealing ring is arranged in the first annular groove. The first connecting pipe is attached to the first sealing ring for sealing, the ring body is attached to the second sealing ring for sealing, meanwhile, the third sealing ring is used for sealing the sealing position between the first connecting disc and the second connecting disc, and the overall sealing effect can be improved through multi-stage sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen pumps, in particular to a sealing structure for a liquid nitrogen pump. Background Art

[0002] An air separation system is a set of industrial equipment used to separate the various gas components in the air to produce oxygen and nitrogen. A liquid nitrogen pump is a cryogenic liquid pump that is part of the air separation system. It increases the pressure of liquid nitrogen to achieve liquid nitrogen transportation.

[0003] After searching, the Chinese patent publication number is CN213807989U, and the publication date is 2021-07-27. It discloses a sealing mechanism for a cryogenic liquid pump, including a sealing device and a power device. The power device is installed on one side of the sealing device. The sealing ring can be limited in the sealing groove by a sealing groove and a fixing column. The first connecting plate and the second connecting plate are spliced together by screws and other fixing components to fix the sealing ring between them, so as to achieve the effect of sealing the gap of the connecting component. The sealing ring can be sealed inside the clamping circular plate of the clamping component by a clamping circular plate and a clamping spring, reducing the contact between the sealing ring and the external air, avoiding the oxidation of the sealing ring by air, and improving the service life of the sealing ring. A cavity is formed by the outer layer delivery pipe and the inner layer delivery pipe, which can avoid frostbite by the delivery pipe when operating the cryogenic liquid pump. In the event of a leak, the cryogenic liquid will not be exposed to the air, which can buy more time for the leak repair work. However, when the device is in use, it relies solely on the sealing ring for sealing, and the sealing effect is not good. Utility Model Content

[0004] The purpose of the present invention is to provide a sealing structure for a liquid nitrogen pump to solve the problems mentioned in the above background technology.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A sealing structure for a liquid nitrogen pump comprises a liquid nitrogen pump connecting portion, a first connecting pipe is fixedly connected to the liquid nitrogen pump connecting portion, and a second connecting pipe is connected to the first connecting pipe via a sealing mechanism.

[0007] The sealing mechanism includes a first connecting plate integrally formed on the first connecting tube and a second connecting plate integrally formed on the second connecting tube, a ring body is integrally formed on the top of the first connecting plate, a through groove is formed through the top of the first connecting plate, a first sealing ring is arranged in the through groove, a first annular groove and a second annular groove are respectively formed at the bottom of the second connecting plate, a second sealing ring is arranged in the first annular groove, and a third sealing ring is arranged between the second annular groove and the through groove.

[0008] As a further solution of the present invention: the through groove is composed of a first groove body, a second groove body and a third groove body, the first sealing ring is located in the third groove body, and part of the third sealing ring is located in the first groove body.

[0009] As a further solution of the present invention: the first connecting tube is composed of a first outer tube and a first inner tube formed as one piece, one end of the first inner tube passes through the first connecting disk and extends to the outside of the first connecting disk, and the first inner tube is adapted to the second trough body.

[0010] As a further solution of the present invention: the second connecting pipe is formed by an integrally formed second outer pipe and a second inner pipe, and the caliber of the second inner pipe is the same as the caliber of the third tank body.

[0011] As a further solution of the present invention: a first fixing ring is provided between the first outer tube and the first inner tube, and a second fixing ring is provided between the second outer tube and the second inner tube.

[0012] As a further solution of the present invention: the first connecting plate and the second connecting plate are detachably connected.

[0013] The utility model provides a sealing structure for a liquid nitrogen pump. Compared with the prior art, it has the following advantages:

[0014] (1) In the present application, after the first connecting tube and the second connecting tube are docked, the first connecting tube is attached to the first sealing ring for sealing, the ring body is attached to the second sealing ring for sealing, and at the same time, the third sealing ring is used to seal the sealing part between the first connecting disk and the second connecting disk. The multi-stage sealing is beneficial to improving the overall sealing effect.

[0015] (2) In the present application, the first connecting pipe and the second connecting pipe are designed with a double layer, so that the low temperature cannot be transmitted to the outer delivery pipe, thereby avoiding frostbite on the delivery pipe when operating the low-temperature liquid pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a partial three-dimensional cross-sectional view of the first connecting pipe, the sealing mechanism and the second connecting pipe of the utility model;

[0018] Figure 3 It is a partial three-dimensional cross-sectional view of the first connecting pipe and the second connecting plate of the utility model;

[0019] Figure 4 It is a partial three-dimensional cross-sectional view of the second connecting pipe and the first connecting plate of the utility model.

[0020] In the figure: 1. liquid nitrogen pump connection part; 2. first connecting pipe; 21. first outer pipe; 22. first inner pipe; 3. sealing mechanism; 31. first connecting disk; 32. second connecting disk; 33. ring body; 34. through groove; 341. first groove body; 342. second groove body; 343. third groove body; 35. first sealing ring; 36. first annular groove; 37. second annular groove; 38. second sealing ring; 39. third sealing ring; 4. second connecting pipe; 41. second outer pipe; 42. second inner pipe; 5. first fixing ring; 6. second fixing ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] See also Figure 1-4 As shown, the utility model is a sealing structure for a liquid nitrogen pump, including a liquid nitrogen pump connecting part 1, a first connecting pipe 2 is fixedly connected to the liquid nitrogen pump connecting part 1, and a second connecting pipe 4 is connected to the first connecting pipe 2 through a sealing mechanism 3; the sealing mechanism 3 includes a first connecting disc 31 integrally formed on the first connecting pipe 2 and a second connecting disc 32 integrally formed on the second connecting pipe 4, a ring body 33 is integrally formed on the top of the first connecting disc 31, a through groove 34 is formed through the top of the first connecting disc 31, a first sealing ring 35 is provided in the through groove 34, and the second connecting disc 32 is integrally formed on the second connecting pipe 4. A first annular groove 36 and a second annular groove 37 are respectively provided at the bottom of the disk 32. A second sealing ring 38 is provided in the first annular groove 36. A third sealing ring 39 is provided between the second annular groove 37 and the through groove 34. After the first connecting tube 2 and the second connecting tube 4 are docked, the first connecting tube 2 is attached to the first sealing ring 35 for sealing, and the ring body 33 is attached to the second sealing ring 38 for sealing. At the same time, the third sealing ring 39 is used to seal the sealing point between the first connecting disk 31 and the second connecting disk 32. Multi-stage sealing is beneficial to improving the overall sealing effect.

[0024] The through groove 34 consists of a first groove body 341 , a second groove body 342 and a third groove body 343 . The first sealing ring 35 is located in the third groove body 343 , and part of the third sealing ring 39 is located in the first groove body 341 .

[0025] The first connecting plate 31 and the second connecting plate 32 are detachably connected.

[0026] Example 2

[0027] Based on Example 1, see Figure 2-4 shown.

[0028] The first connecting tube 2 is formed of an integrally formed first outer tube 21 and a first inner tube 22 . One end of the first inner tube 22 passes through the first connecting plate 31 and extends to the outside of the first connecting plate 31 . The first inner tube 22 is adapted to the second groove 342 .

[0029] The second connecting pipe 4 is composed of a second outer pipe 41 and a second inner pipe 42 formed as one piece. The diameter of the second inner pipe 42 is the same as the diameter of the third trough body 343. By adopting a double-layer design for the first connecting pipe 2 and the second connecting pipe 4, the low temperature cannot be transmitted to the outer delivery pipe, thereby avoiding frostbite on the delivery pipe when operating the low-temperature liquid pump.

[0030] A first fixing ring 5 is provided between the first outer tube 21 and the first inner tube 22. By providing the first fixing ring 5, the stability between the first outer tube 21 and the first inner tube 22 can be increased. A second fixing ring 6 is provided between the second outer tube 41 and the second inner tube 42. By providing the second fixing ring 6, the stability between the second outer tube 41 and the second inner tube 42 can be increased.

[0031] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0032] The working principle of the present invention is as follows: the first sealing ring 35 is placed in the third groove 343, the third sealing ring 39 is placed in the first groove 341, and the second sealing ring 38 is placed in the first annular groove 36. Then, the first connecting pipe 2 is placed above the second connecting pipe 4, and the first inner pipe 22 is inserted into the second groove 342, so that the second groove 342 presses on the first sealing ring 35 for sealing, and the first connecting plate 31 and the second connecting plate 32 are fitted together, so that the third sealing ring 39 seals the connection between the first connecting plate 31 and the second connecting plate 32, and 33 presses on 38 for sealing. Then, the first connecting plate 31 and the second connecting plate 32 are fixed with bolts. After the first connecting pipe 2 and the second connecting pipe 4 are docked, the first connecting pipe 2 is fitted on the first sealing ring 35 for sealing, and the annular body 33 is fitted on the second sealing ring 38 for sealing. At the same time, the third sealing ring 39 is used to seal the sealing portion between the first connecting plate 31 and the second connecting plate 32. Multi-stage sealing is beneficial to improving the overall sealing effect.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a liquid nitrogen pump, comprising a liquid nitrogen pump connecting portion (1), characterized in that: A first connecting pipe (2) is fixedly connected to the liquid nitrogen pump connecting portion (1), and a second connecting pipe (4) is connected to the first connecting pipe (2) via a sealing mechanism (3); The sealing mechanism (3) comprises a first connecting disk (31) integrally formed on the first connecting tube (2) and a second connecting disk (32) integrally formed on the second connecting tube (4); a ring body (33) is integrally formed on the top of the first connecting disk (31); a through groove (34) is provided through the top of the first connecting disk (31); a first sealing ring (35) is provided in the through groove (34); a first annular groove (36) and a second annular groove (37) are respectively provided on the bottom of the second connecting disk (32); a second sealing ring (38) is provided in the first annular groove (36); and a third sealing ring (39) is provided between the second annular groove (37) and the through groove (34).

2. A sealing structure for a liquid nitrogen pump according to claim 1, characterized in that: The through groove (34) consists of a first groove body (341), a second groove body (342) and a third groove body (343); the first sealing ring (35) is located in the third groove body (343); and part of the third sealing ring (39) is located in the first groove body (341).

3. A sealing structure for a liquid nitrogen pump according to claim 2, characterized in that: The first connecting tube (2) is formed of a first outer tube (21) and a first inner tube (22) formed in one piece, one end of the first inner tube (22) passes through the first connecting disk (31) and extends to the outside of the first connecting disk (31), and the first inner tube (22) is adapted to the second trough body (342).

4. The sealing structure for a liquid nitrogen pump according to claim 3, characterized in that: The second connecting tube (4) is formed of a second outer tube (41) and a second inner tube (42) formed in one piece, and the caliber of the second inner tube (42) is the same as the caliber of the third tank body (343).

5. The sealing structure for a liquid nitrogen pump according to claim 4, characterized in that: A first fixing ring (5) is provided between the first outer tube (21) and the first inner tube (22), and a second fixing ring (6) is provided between the second outer tube (41) and the second inner tube (42).

6. The sealing structure for a liquid nitrogen pump according to claim 1, characterized in that: The first connecting plate (31) and the second connecting plate (32) are detachably connected.

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