CN118088470A - Liquid nitrogen pumping equipment - Google Patents
Liquid nitrogen pumping equipment Download PDFInfo
- Publication number
- CN118088470A CN118088470A CN202410472520.6A CN202410472520A CN118088470A CN 118088470 A CN118088470 A CN 118088470A CN 202410472520 A CN202410472520 A CN 202410472520A CN 118088470 A CN118088470 A CN 118088470A
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- China
- Prior art keywords
- bearing
- liquid nitrogen
- protective shell
- pipe
- fixedly connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 239000007788 liquid Substances 0.000 title claims abstract description 77
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 76
- 238000005086 pumping Methods 0.000 title claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 68
- 230000001681 protective effect Effects 0.000 claims abstract description 46
- 210000001503 joint Anatomy 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 208000001034 Frostbite Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of liquid nitrogen production equipment, and particularly provides liquid nitrogen pumping equipment which comprises a protective shell arranged on a base, wherein a liquid nitrogen pump is arranged in the protective shell, and the input end of the liquid nitrogen pump is connected with a motor through a coupler; one end of the protective shell is provided with a bearing protective shell, a bearing is arranged in the bearing protective shell, the outer ring of the bearing is in butt joint with the bearing protective shell, the inner ring of the bearing is arranged on the coupler, a first sealing ring for sealing the bearing is also arranged in the bearing protective shell, a liquid outlet of the liquid nitrogen pump is fixedly connected with the first end of the connecting pipe, the second end of the connecting pipe passes through the upper protective shell, a limiting pipe is arranged on the protective shell, and a side sealing ring is arranged between the limiting pipe and the connecting pipe; one end of the protective shell is provided with an air outlet, the air outlet is sequentially and fixedly connected with the first electromagnetic three-way valve, the exhaust pipe and the vacuum pump, and the motor is positioned outside the protective shell. The whole protective shell and the liquid nitrogen pump adopt negative pressure, so that the leaked liquid nitrogen is prevented from damaging personnel handling accidents.
Description
Technical Field
The invention relates to the technical field of liquid nitrogen production equipment, and particularly provides liquid nitrogen pumping equipment.
Background
Liquid nitrogen is a liquid obtained by inert, colorless, odorless, noncorrosive, nonflammable nitrogen in an extremely low temperature environment, and the boiling point of nitrogen is-196.56 ℃ under normal pressure. Because of its extremely low boiling point at normal pressure, liquid nitrogen is typically produced and transported under pressurized conditions. The large flow delivery of liquid nitrogen requires pumping by a corresponding liquid nitrogen pump. Because the operating environment of the liquid nitrogen pump belongs to an extremely low-temperature environment, the sealing structure of the liquid nitrogen pump is easy to age and damage, so that the sealing performance is reduced, and once the liquid nitrogen pump is not maintained in place, liquid nitrogen leakage occurs. The liquid nitrogen leaks the back and will absorb heat and volatilize, and the very low temperature liquid nitrogen can absorb heat in a large number when volatilizing to cause personnel frostbite, consequently once the liquid nitrogen pump leaks, a large amount of high pressure liquid nitrogen spouts, very easily causes nearby staff to be injured. The relative molecular mass of nitrogen is 28, which is close to that of air, so that the diffusion of the liquid nitrogen after volatilization is slower, and the nitrogen content at a local position is too high, which causes the threat to the health of the body, especially indoors.
Disclosure of Invention
In order to solve the technical problems, the invention provides liquid nitrogen pumping equipment which comprises a base, wherein a protective shell is arranged on the base, a liquid nitrogen pump is arranged in the protective shell, and the input end of the liquid nitrogen pump is connected with a motor through a coupler; the liquid nitrogen pump is characterized in that one end of the protective shell is provided with a bearing protective shell, a bearing is arranged in the bearing protective shell, an outer ring of the bearing is abutted against the bearing protective shell, an inner ring of the bearing is arranged on the coupler, a first sealing ring for sealing the bearing is also arranged in the bearing protective shell, a liquid outlet of the liquid nitrogen pump is fixedly connected with a first end of a connecting pipe, a second end of the connecting pipe penetrates through the upper protective shell, a limiting pipe is arranged on the protective shell, and a side sealing ring is arranged between the limiting pipe and the connecting pipe; one end of the protective shell is provided with an air outlet, the air outlet is sequentially and fixedly connected with the first electromagnetic three-way valve, the exhaust pipe and the vacuum pump, and the motor is positioned outside the protective shell.
The first sealing ring comprises a sealing ring body, the sealing ring body is annular and is inserted between the inner ring and the outer ring of the bearing, one end of the sealing ring body is provided with a first connecting part and a second connecting part, and the first connecting part and the second connecting part are annular; the first connecting part extends along the radial direction of the first sealing ring and towards the inside of the first sealing ring, and the second connecting part extends along the radial direction of the first sealing ring and towards the outside of the first sealing ring; the end of the first connecting portion is fixedly connected with one end of the second arc-shaped portion, the other end of the second arc-shaped portion is fixedly connected with the second abutting portion, the end of the second connecting portion is fixedly connected with one end of the first arc-shaped portion, and the other end of the first arc-shaped portion is fixedly connected with the first abutting portion.
The first abutting part is annular, and the outer diameter of the connecting end of the first abutting part and the first arc-shaped part is smaller than the outer diameter of the free end of the first abutting part; the second abutting part is also annular, and the outer diameter of the connecting end of the second abutting part and the second arc-shaped part is larger than the outer diameter of the free end of the second abutting part.
Two bearings and two first sealing rings are arranged in the bearing protective shell, the middle joint of the coupler is positioned between the first bearing and the second bearing, and the two first sealing rings are respectively positioned at one ends of the two bearings, which are close to each other.
The bearing protection shell is fixedly provided with an air inlet pipe, the air inlet pipe is fixedly connected with the first end of the second three-way electromagnetic valve, and the second end of the second three-way electromagnetic valve is connected with the air compressor unit through an air delivery pipe.
And the air inlet pipe is also provided with a stop valve and a second pressure sensor, and the second pressure sensor is positioned between the stop valve and the bearing protecting shell.
The base is hollow structure, the ventilation pipe is installed to the one end of base, ventilation pipe and fan fixed connection, the one end that the fan was kept away from to the base is equipped with a plurality of air outlets.
The base includes bottom plate and top cap, the welding has a plurality of diaphragms and indulges the board on the bottom plate, the top cap welding is on the bottom plate, and inner wall and diaphragm and indulge board fixed connection, be equipped with a plurality of second through-holes on the diaphragm, be equipped with a plurality of third through-holes on the indulging the board, air outlet and ventilation pipe are all installed at the top cap.
The bottom plate is provided with a plurality of first through holes.
The bottom of the bottom plate is fixedly provided with a plurality of supporting beams.
The invention has the following technical effects:
According to the invention, the whole pump body is arranged in the protective shell, once the leakage of the liquid nitrogen pump occurs, the leaked liquid nitrogen can be positioned in a relatively closed area, so that the liquid nitrogen pump is convenient to process; the whole protective housing adopts the negative pressure with the part of liquid nitrogen pump, adopts the sealing washer to add malleation with the position that the shaft coupling corresponds, prevents that liquid nitrogen of leakage or volatilized low temperature nitrogen from leaking from the shaft coupling, causes the damage to handling accident's personnel.
The first sealing ring comprises a sealing ring main body, and a first sealing ring and a second sealing ring which are respectively arranged on the inner ring and the outer ring of the sealing ring main body, the two sealing rings are tightly attached to the coupler and the protective shell by means of self elasticity, meanwhile, positive pressure is kept between the two sealing rings, the sealing rings are tightly pressed by the positive pressure, and the sealing rings are prevented from being reduced in sealing performance due to self elasticity after being used for a long time.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure at B in FIG. 1;
FIG. 3 is a schematic view of the structure at C in FIG. 1;
FIG. 4 is a schematic diagram of the structure at A in FIG. 1;
FIG. 5 is a schematic structural view of a seal ring;
FIG. 6 is a schematic structural diagram of a protective shell.
In the figure, the upper shell is 1-the connecting pipe is 101-the limiting pipe is 102-the limiting pipe is 103-the top flange is 104-the top sealing ring is 105-the sealing ring cavity is 106-the side sealing ring is 107-the first side edge;
2-air outlet, 3-first electromagnetic three-way valve, 4-exhaust pipe, 5-vacuum pump;
6-base, 601-top cover, 602-cross plate, 603-bottom plate, 604-first through hole, 605-longitudinal plate, 606-second through hole, 607-third through hole, 608-support beam;
7-ventilation pipes, 8-fans, 9-motors, 10-air compressor units, 11-air delivery pipes, 12-temperature sensors, 13-pump seats, 14-first pressure sensors, 15-liquid nitrogen pumps, 16-first bearing shells and 17-first bearings;
18-a first sealing ring, 1801-a sealing ring body, 1802-a first arc-shaped part, 1803-a first abutting part, 1804-a second arc-shaped part, 1805-a second abutting part, 1806-a first connecting part, 1807-a second connecting part;
19-a second pressure sensor, 20-a second three-way electromagnetic valve, 21-an air inlet pipe, 22-a stop valve, 23-a coupler, 24-a second bearing and 25-a second sealing ring;
26-a lower housing, 2601-a second side edge;
27-a second bearing protective shell and 28-a limiting shell.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 6, the invention provides a liquid nitrogen pumping device, which comprises a base 6, wherein one end of the base 6 is detachably provided with a motor 9, the other end of the base 6 is detachably provided with a liquid nitrogen pump 15, the motor 9 drives the liquid nitrogen pump 15, namely, an output shaft of the motor 9 is connected with an input shaft of the liquid nitrogen pump 15 through a coupling 23.
The base 6 is also provided with a protective shell for covering the whole liquid nitrogen pump 15. The protective shell comprises an upper shell 1 and a lower shell 26, wherein the lower shell 26 is rectangular frame-shaped, the top and the bottom are both open, and the bottom is fixedly welded on the base 6; the upper housing 1 is detachably mounted on top of the lower housing 26 by bolts.
As shown in fig. 1,2 and 6, a first bearing casing 16 is welded and fixed to one end of the lower casing 26 near the motor 9, and the first bearing casing 16 is welded and fixed to the lower casing 26 to form a part of the lower casing 26; a second bearing housing 27 is welded and fixed to one end of the upper casing 1 near the motor 9, and the second bearing housing 27 is welded and fixed to the upper casing 1 to form a part of the upper casing 1.
After the lower housing 26 and the upper housing 1 are mounted, the second bearing housing 27 and the first bearing housing 16 are also snapped together to form a complete bearing housing.
The first bearing 17 and the second bearing 24 are installed inside the bearing housing, the two bearings are respectively located at two sides of the bearing housing, and the bearing housing compresses the outer ring of the bearing. That is, both ends of the second bearing housing 27 and the first bearing housing 16 are abutted with outer rings of the first bearing 17 and the second bearing 24, respectively, and are tightly fitted, and in order to maintain stability of the first bearing 17 and the second bearing 24, a limit groove (not shown in the drawings) may be provided at a position where the second bearing housing 27 and the first bearing housing 16 are in contact with the first bearing 17 and the second bearing 24, so that a part of the outer rings of the first bearing 17 and the second bearing 24 is located in the limit groove.
The first bearing 17 and the second bearing 24 are respectively installed at both ends of the coupling 23, and an intermediate connection of the coupling 23 is located between the first bearing 17 and the second bearing 24.
In order to ensure the tightness of the protective shell, leaked liquid nitrogen or low-temperature nitrogen is prevented from rushing out from the joint of the protective shell, a first side edge 107 is arranged at the edge of the upper shell 1, the first side edge 107 extends to the second bearing protective shell 27, a second side edge 2601 matched with the first side edge 107 is arranged at the edge of the lower shell 26, connecting holes matched with each other are formed in the first side edge 107 and the second side edge 2601, a second sealing ring 25 is arranged between the upper shell 1 and the lower shell 26, and bolts sequentially penetrate through the first side edge 107, the second sealing ring 25 and the second side edge 2601 and are provided with nuts. A first seal ring 18 is installed in the bearing housing to match the first bearing 17 and the second bearing 24 for preventing leaked liquid nitrogen or low temperature nitrogen from overflowing from the bearing housing.
The first seal ring 18 is configured as shown in fig. 2 and 5, and includes a seal ring body 1801, where the seal ring body 1801 is annular, and the seal ring body 1801 is configured to be inserted between an inner ring and an outer ring of the first bearing 17 or the second bearing 24. One end of the sealing ring body 1801 is provided with a first connecting part 1806 and a second connecting part 1807, and the first connecting part 1806 and the second connecting part 1807 are annular; the first connecting portion 1806 extends along the radial direction of the first seal ring 18 toward the inside of the first seal ring 18, and the second connecting portion 1807 extends along the radial direction of the first seal ring 18 toward the outside of the first seal ring 18.
The end of the first connecting part 1806 is fixedly connected with one end of the second arc-shaped part 1804, the other end of the second arc-shaped part 1804 is fixedly connected with the second abutting part 1805, and the central angle of the second arc-shaped part 1804 is smaller than 45 degrees; the second abutment 1805 sidewall is tangential to the end of the second arc 1804.
The end of the second connecting part 1807 is fixedly connected with one end of the first arc-shaped part 1802, the other end of the first arc-shaped part 1802 is fixedly connected with the first abutting part 1803, and the central angle of the first arc-shaped part 1802 is smaller than 45 degrees; the first abutment 1803 sidewall is tangential to the end of the first arcuate portion 1802.
The first abutment 1803 is annular, and the outer diameter of the connecting end of the first abutment 1803 with the first arcuate portion 1802 is smaller than the outer diameter of the free end thereof; the second abutment 1805 is also annular, with the outer diameter of the connecting end thereof with the second arcuate portion 1804 being smaller than the outer diameter of the free end thereof; the first abutment 1803 and the second abutment 1805 are both of uniform wall thickness.
Therefore, when the second abutting portion 1805 is pressed from the inside of the first seal ring 18 or when the first abutting portion 1803 is pressed from the outside of the first seal ring 18, the second abutting portion 1805 and the first abutting portion 1803 generate elastic force to return to the original state due to the presence of the second arc portion 1804 and the first arc portion 1802; and meanwhile, fatigue fracture of the connecting point caused by long-time extrusion of the second arc-shaped part 1804 and the first arc-shaped part 1802 and the first abutting part 1803 and the second abutting part 1805 can be avoided.
After the first seal ring 18 is mounted, the first connecting portion 1806 abuts against the inner ring of the first bearing 17 or the second bearing 24, the second connecting portion 1807 abuts against the outer ring of the first bearing 17 or the second bearing 24, the first abutting portion 1803 abuts against the second bearing housing 27 and the first bearing housing 16, and the second abutting portion 1805 abuts against the coupling 23, thereby sealing the first bearing 17 and the second bearing 24.
As shown in fig. 1 and 2, there are two first sealing rings 18, one for sealing the first bearing 17 and the other for sealing the second bearing 24, and the two first sealing rings 18 are arranged in mirror image and are respectively located at one ends of the first bearing 17 and the second bearing 24 close to each other.
An air inlet pipe 21 is fixedly installed on the second bearing housing 27, the air inlet pipe 21 is fixedly connected with a first end of the second three-way electromagnetic valve 20, and a second end of the second three-way electromagnetic valve 20 is connected with the air compressor unit 10 through the air delivery pipe 11. The connection point of the air inlet pipe 21 and the second bearing housing 27 is located between the two first sealing rings 18. The air inlet pipe 21 is also provided with a shut-off valve 22 and a second pressure sensor 19, wherein the second pressure sensor 19 is located between the shut-off valve 22 and a second bearing housing 27. Compressed air is injected into the middle of the two first sealing rings 18 to form positive pressure, so that the first sealing rings 18 are pressed, and the tightness is further ensured. The second pressure sensor 19 is used for detecting the pressure between the two first sealing rings 18, and when the pressure is reduced, the stop valve 22 is opened, and the air compressor assembly 10 is pressurized.
The liquid outlet of the liquid nitrogen pump 15 is fixedly connected with the first end of the connecting pipe 101, and the second end of the connecting pipe 101 penetrates through the upper shell 1. The upper shell 1 is fixedly provided with a limiting pipe 102 matched with the connecting pipe 101, the inner diameter of the limiting pipe 102 is larger than the outer diameter of the connecting pipe 101, and a side sealing ring 106 is arranged between the connecting pipe 101 and the limiting pipe 102. The top of the limiting pipe 102 is provided with a top flange 103 through threads, specifically, the bottom of the top flange 103 is provided with an internal thread sleeve, and the limiting pipe 102 is provided with external threads matched with the internal thread sleeve; the top flange 103 is provided with a sealing ring cavity 105 matched with the connecting pipe 101, a top sealing ring 104 is arranged in the sealing ring cavity 105, and the top sealing ring 104 tightly abuts against the connecting pipe 101 and the side sealing rings 106. After the top flange 103 is screwed on the limiting pipe 102, the top sealing ring 104 presses the side sealing ring 106, so that sealing is achieved.
The liquid inlet of the liquid nitrogen pump 15 is fixedly connected with a liquid inlet pipe, semicircular limiting shells 28 are arranged on the upper shell 1 and the lower shell 26, the limiting shells 28 are tightly buckled on the liquid inlet pipe, and a third sealing ring is arranged between the limiting shells and the liquid inlet pipe. Of course, the connection between the connecting tube 101 and the upper housing 1 can also be applied between the inlet tube and the lower housing 26.
An air outlet 2 is arranged at one end of the lower shell 26 far away from the motor 9, the air outlet 2 is fixedly connected with the first end of the first electromagnetic three-way valve 3, the second end of the first electromagnetic three-way valve 3 is fixedly connected with the first end of the air extraction pipe 4, and the second end of the air extraction pipe 4 is fixedly connected with the input end of the vacuum pump 5. The vacuum pump 5 pumps the whole protective shell into a negative pressure state, and the protective shell is extruded by means of atmospheric pressure, so that better sealing is realized by matching with each sealing ring. The third end of the first electromagnetic three-way valve 3 can be connected with an exhaust fan through an exhaust pipe.
Since the whole protective shell is sealed, after the liquid nitrogen pump 15 leaks, liquid nitrogen and low-temperature nitrogen can be limited in the protective shell, and a small amount of liquid nitrogen absorbs heat and volatilizes and is discharged by the vacuum pump 5. A large amount of liquid nitrogen leaks out through the third end of the first electromagnetic three-way valve 3.
In order to prevent the leakage of liquid nitrogen from causing the temperature of the outer wall of the protective shell to be too low, the upper shell 1 and the lower shell 26 can adopt a sandwich structure provided with heat insulation layers, or the heat insulation layers can be additionally arranged on the outer walls of the upper shell 1 and the lower shell 26.
In order to enable liquid nitrogen leaked in the protective shell to absorb heat and volatilize better, the base 6 is of a hollow structure, a ventilation pipe 7 is arranged at one end of the base 6, and the ventilation pipe 7 is fixedly connected with a fan 8. One end of the base 6 far away from the fan 8 is provided with a plurality of air outlets.
Specifically, the base 6 includes a bottom plate 603 and a top cover 601, and a plurality of transverse plates 602 and longitudinal plates 605 are welded on the bottom plate 603, and the transverse plates 602 and the longitudinal plates 605 form a supporting frame. The top cover 601 is welded to the bottom plate 603, and the inner walls thereof are fixed to the transverse plate 602 and the longitudinal plate 605 by welding or screwing. The transverse plate 602 is provided with a plurality of second through holes 606, the longitudinal plate 605 is provided with a plurality of third through holes 607 for ventilation, the air outlet is arranged on the top cover 601, and the ventilation pipe 7 is fixedly arranged on the top cover 601.
A pump seat 13 is fixedly mounted on the top cover 601, and a liquid nitrogen pump 15 is mounted on the pump seat 13.
The fan 8 ventilates the inside of the base 6, ensures that the inside of the base 6 is always normal-temperature air, and is favorable for quick heat absorption and volatilization of leaked liquid nitrogen. The liquid nitrogen absorbs heat and volatilizes, and simultaneously cools the air in the base 6, so that water vapor is condensed, and therefore, a plurality of first through holes 604 are formed in the bottom plate 603 for draining water. A plurality of supporting beams 608 are fixedly arranged at the bottom of the bottom plate 603, so that a gap is formed between the bottom plate 603 and the ground, water drainage is facilitated, and air circulation is also facilitated.
The upper shell 1 is also provided with a first pressure sensor 14 and a temperature sensor 12, and once liquid nitrogen leaks, the temperature and the pressure in the protective shell can change, and at the moment, the liquid nitrogen leakage is judged.
The whole device is controlled by a controller. Each time the air compressor is used, the inside of the protecting shell needs to be pumped into a negative pressure state, and then the air compressor unit 10 is started to flush positive pressure into the second bearing protecting shell 27 and the first bearing protecting shell 16. After the use, the stop valve 22 is opened, the first end and the third end of the second three-way electromagnetic valve 20 are communicated, and then the first end and the third end of the first electromagnetic three-way valve 3 are communicated.
In accordance with the above embodiments of the invention, these embodiments are not exhaustive of all details, nor are they intended to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A liquid nitrogen pumping apparatus, characterized in that: the device comprises a base (6), wherein a protective shell is arranged on the base (6), a liquid nitrogen pump (15) is arranged in the protective shell, and the input end of the liquid nitrogen pump (15) is connected with a motor (9) through a coupler (23); one end of the protection shell is provided with a bearing protection shell, a bearing is arranged in the bearing protection shell, an outer ring of the bearing is in butt joint with the bearing protection shell, an inner ring of the bearing is arranged on a shaft coupling (23), a first sealing ring (18) for sealing the bearing is also arranged in the bearing protection shell, a liquid outlet of a liquid nitrogen pump (15) is fixedly connected with a first end of a connecting pipe (101), a second end of the connecting pipe (101) passes through the upper protection shell, a limiting pipe (102) is arranged on the protection shell, and a side sealing ring (106) is arranged between the limiting pipe (102) and the connecting pipe (101); one end of the protective shell is provided with an air outlet (2), the air outlet (2) is sequentially and fixedly connected with the first electromagnetic three-way valve (3), the exhaust pipe (4) and the vacuum pump (5), and the motor (9) is positioned outside the protective shell.
2. The liquid nitrogen pumping apparatus of claim 1, wherein: the first sealing ring (18) comprises a sealing ring body (1801), the sealing ring body (1801) is annular and is inserted between the inner ring and the outer ring of the bearing, one end of the sealing ring body (1801) is provided with a first connecting part (1806) and a second connecting part (1807), and the first connecting part (1806) and the second connecting part (1807) are annular; the first connecting portion (1806) extends along the radial direction of the first seal ring (18) and toward the inside of the first seal ring (18), and the second connecting portion (1807) extends along the radial direction of the first seal ring (18) and toward the outside of the first seal ring (18); the end of the first connecting portion (1806) is fixedly connected with one end of the second arc-shaped portion (1804), the other end of the second arc-shaped portion (1804) is fixedly connected with the second abutting portion (1805), the end of the second connecting portion (1807) is fixedly connected with one end of the first arc-shaped portion (1802), and the other end of the first arc-shaped portion (1802) is fixedly connected with the first abutting portion (1803).
3. The liquid nitrogen pumping apparatus of claim 2, wherein: the first abutting part (1803) is annular, and the outer diameter of the connecting end of the first abutting part (1803) and the first arc-shaped part (1802) is smaller than the outer diameter of the free end of the first abutting part; the second abutment portion (1805) is also annular and the outer diameter of the connecting end with the second arcuate portion (1804) is greater than the outer diameter of the free end thereof.
4. The liquid nitrogen pumping apparatus of claim 1, wherein: two bearings and two first sealing rings (18) are arranged in the bearing protective shell, the middle joint of the coupler (23) is located between the first bearing (17) and the second bearing (24), and the two first sealing rings (18) are respectively located at one ends of the two bearings (24) close to each other.
5. The liquid nitrogen pumping apparatus of claim 4, wherein: an air inlet pipe (21) is fixedly arranged on the bearing protecting shell, the air inlet pipe (21) is fixedly connected with the first end of a second three-way electromagnetic valve (20), and the second end of the second three-way electromagnetic valve (20) is connected with an air compressor unit (10) through an air delivery pipe (11).
6. The liquid nitrogen pumping apparatus of claim 5, wherein: the air inlet pipe (21) is further provided with a stop valve (22) and a second pressure sensor (19), and the second pressure sensor (19) is positioned between the stop valve (22) and the bearing protection shell.
7. The liquid nitrogen pumping apparatus of claim 1, wherein: the base (6) is of a hollow structure, a ventilation pipe (7) is arranged at one end of the base (6), the ventilation pipe (7) is fixedly connected with the fan (8), and a plurality of air outlets are formed in one end, far away from the fan (8), of the base (6).
8. The liquid nitrogen pumping apparatus of claim 7, wherein: base (6) include bottom plate (603) and top cap (601), the welding has a plurality of diaphragm (602) and vertical board (605) on bottom plate (603), top cap (601) welding is on bottom plate (603), and inner wall and diaphragm (602) and vertical board (605) fixed connection, be equipped with a plurality of second through-holes (606) on diaphragm (602), be equipped with a plurality of third through-holes (607) on vertical board (605), air outlet and ventilation pipe (7) are all installed in top cap (601).
9. The liquid nitrogen pumping apparatus of claim 8, wherein: a plurality of first through holes (604) are formed in the bottom plate (603).
10. The liquid nitrogen pumping apparatus of claim 8, wherein: a plurality of supporting beams (608) are fixedly arranged at the bottom of the bottom plate (603).
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