CN115468108A

CN115468108A - Liquid nitrogen gasification system

Info

Publication number: CN115468108A
Application number: CN202210876865.9A
Authority: CN
Inventors: 袁久伟; 李志君; 李玉博
Original assignee: Jiahua Science and Technology Development Shanghai Ltd
Current assignee: Jiahua Science and Technology Development Shanghai Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-12-13
Anticipated expiration: 2042-07-25
Also published as: CN115468108B

Abstract

The invention provides a liquid nitrogen gasification system, and relates to the technical field of chemical equipment. The liquid nitrogen gasification system comprises a gasifier, a deicing assembly, a driving mechanism and a change-over switch assembly. Wherein the gasifier comprises a gasification pipe; the deicing assembly comprises a deicing piece, the deicing piece is arranged on the outer side of the gasification pipe, and a deicing gap is reserved between the deicing piece and the outer side wall of the gasification pipe; the driving mechanism comprises a transmission assembly, and the transmission assembly comprises two screw rods which rotate reversely, two transmission bearings and a bearing seat; the outer rings of the two transmission bearings are arranged on the bearing seat, and the inner rings are in threaded connection with the lead screw; the deicing member is connected with the bearing seat; the transmission bearing has a transmission state and an idle state; the switch assembly controls the deicing member to move back and forth along the gasification pipe. The deicing device can solve the problems of high cost, high power consumption, easy failure and low reliability of the deicing device in the prior art, and has the effects of low cost, low power consumption and reliable operation.

Description

Liquid nitrogen gasification system

Technical Field

The invention relates to the technical field of chemical equipment, in particular to a liquid nitrogen gasification system.

Background

Nitrogen has excellent performances of low price and stable performance, is widely applied to chemical production, and is mainly stored in a liquid nitrogen form. The nitrogen is mainly used by storing liquid nitrogen in a storage tank, converting the liquid nitrogen into gaseous nitrogen through a gasifier, storing the gaseous nitrogen in a nitrogen buffer tank, and conveying the nitrogen in the buffer tank to a workshop for use through a pipeline under a certain pressure.

In the process, when the liquid nitrogen is gasified by the gasifier, a large amount of heat in the surrounding air can be absorbed, so that moisture in the air is condensed on the gasifier, and particularly when the nitrogen is used in a large amount and in winter with low air temperature, the gasifier can cover a thick ice layer in a short time, so that the gasification effect of the gasifier is influenced, and the demand supply of nitrogen for workshop production is seriously influenced.

The traditional solution is manual deicing, namely, an operator uses an appliance to deice, the mode is time-consuming and labor-consuming, the cleaning effect is poor, and particularly a heavy ice layer is formed, so that the ice layer is more difficult to clean.

In the defrosting mechanism in the prior art, a frost scraping plate is arranged on a pipe arrangement, a low-speed motor and a steel wire guide wheel are arranged at two ends of the pipe arrangement, a steel wire rope is assembled, a steel wire rope head is fixed on the frost scraping plate, and the frost scraping plate penetrates through holes at two ends of the frost scraping plate and is arranged on a guide pipe of the frost scraping plate. Switches are arranged at two ends of the tube bank. When the frost scraping plate moves to one end and touches the travel switch, the low-speed motor is powered off, the frost scraping plate stops moving, and a frost scraping travel is finished. When the next defrosting signal arrives, the low-speed motor rotates reversely, the defrosting plate moves reversely, and the next defrosting process is carried out. In this scheme, control low-speed motor positive and negative rotation through travel switch to control the reciprocating motion of scraping the frost board, however, in this scheme, need realize through complicated circuit and controller between travel switch and the low-speed motor, with high costs and the consumption is big, and breaks down easily, and the reliability is low.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of high cost, high power consumption, easy failure and low reliability of the deicing device in the prior art, thereby providing a liquid nitrogen gasification system.

In order to solve the above problems, an aspect of the present invention provides a liquid nitrogen gasification system, which includes a gasifier, a deicing assembly, a driving mechanism, and a switch assembly. Wherein the gasifier comprises a gasification pipe; the deicing assembly comprises a deicing piece, the deicing piece is arranged on the outer side of the gasification pipe, and a deicing gap is reserved between the deicing piece and the outer side wall of the gasification pipe; the driving mechanism comprises a transmission assembly, the transmission assembly comprises two screw rods which rotate reversely, two transmission bearings and a bearing seat, and the two transmission bearings are respectively sleeved on the two screw rods; the outer rings of the two transmission bearings are arranged on the bearing seat, and the inner rings of the two transmission bearings are provided with threads matched with the lead screw and are in threaded connection with the lead screw; the deicing piece is connected with the bearing seat; the transmission bearing has a transmission state that the inner ring is fixed and an idle rotation state that the inner ring rotates; the transmission bearing in a transmission state is suitable for driving the deicing component to move along the axial direction of the gasification pipe; the two screw rods which rotate reversely are suitable for driving the deicing component to do reciprocating motion along the axial direction of the gasification pipe so as to remove the frost in the deicing gap; the change-over switch component is matched with the inner ring of the transmission bearing and is suitable for controlling the inner ring of the transmission bearing to be switched between a transmission state and an idle state.

Optionally, the gasifier further comprises a frame, and the gasifier and the driving mechanism are both arranged on the frame; the gasification pipes are arranged in parallel, and the two screw rods are parallel to the gasification pipes and are rotatably arranged on the rack side by side; each gasification pipe is provided with an ice removal piece; the deicing assembly further comprises a linkage piece, the deicing pieces are all connected with the linkage piece, and the bearing seat is connected with the linkage piece so as to drive the deicing pieces to do reciprocating motion along the axial direction of the gasification pipe.

Optionally, the deicing member includes a deicing ring, and the deicing ring is sleeved on the gasification pipe; the linkage piece comprises a linkage rod, and the plurality of deicing rings are connected into a whole through the linkage rod.

Optionally, fins are arranged on the gasification tube, the inner contour of the deicing ring is matched with the outer contour of the fins, the deicing ring is sleeved on the gasification tube and the fins, and the deicing gaps include gaps between the deicing ring and the outer side wall of the gasification tube and gaps between the deicing ring and the fins.

Optionally, the switch assembly comprises a switch member and a trigger member, the switch member has a locking position and an unlocking position, and the trigger member is adapted to drive the switch member to move between the locking position and the unlocking position; the inner ring of the transmission bearing is provided with a first limiting structure, the switching piece is provided with a second limiting structure matched with the first limiting structure, the switching piece is located at a locking position, and the second limiting structure is suitable for being clamped and locked with the first limiting structure, so that the transmission bearing is located in a transmission state; the switching piece is located at the unlocking position, and the second limiting structure is suitable for being separated from the first limiting structure to be unlocked, so that the inner ring of the transmission bearing is located in an idling state.

Optionally, the first limiting structure includes a limiting convex edge which is arranged on the inner ring of the transmission bearing and protrudes out of the outer ring of the transmission bearing along the axial direction of the limiting convex edge, and at least one limiting groove which is arranged on the limiting convex edge; the switching piece comprises a swinging rod which is rotatably connected with the linkage rod; the second limiting structure comprises a limiting rod arranged on the swinging rod, the limiting rod is clamped in the limiting groove to enable the transmission bearing to be in a transmission state, and the second limiting structure swings to be separated from the limiting groove to enable the transmission bearing to be in an idle running state; the limiting rod is arranged between the transmission bearings, and one limiting rod is arranged and is suitable for being clamped in a limiting groove of any transmission bearing in a staggered manner through swinging; or two limiting rods are arranged and are suitable for being clamped in the limiting grooves of the two transmission bearings in a staggered manner.

Optionally, two triggering pieces are arranged and are respectively fixedly arranged on the machine frames at two ends of the gasification pipe; the two triggering parts are suitable for being matched with the switching part to drive the limiting rod to swing, so that the inner ring of the transmission bearing is switched between a transmission state and an idle state.

Optionally, the trigger includes a trigger rod, one end of the trigger rod is connected to the frame, and the other end extends toward the switching piece; the switching piece comprises a switching rod arranged on the swinging rod; the switching rod and the limiting rod are arranged on the swinging rod at intervals, and when the switching rod moves along the lead screw along with the linkage rod to be abutted against the trigger rod, the trigger rod pushes the switching rod to drive the swinging rod to swing.

Optionally, the swing rod is provided with two limiting rods, namely a first limiting rod and a second limiting rod, the first limiting rod is suitable for being locked with one of the transmission bearings on the bearing block in a clamping manner, and the second limiting rod is suitable for being locked with the other transmission bearing on the bearing block in a clamping manner; the first limiting rod and the second limiting rod are perpendicular to the swinging rod, and the first limiting rod and the second limiting rod are coplanar and perpendicular; the swing rod is provided with two switching rods which are a first switching rod and a second switching rod respectively, the first switching rod and the second switching rod are perpendicular to the swing rod, and the first switching rod and the second switching rod are perpendicular to different surfaces.

Optionally, two elastic pieces arranged in parallel are arranged on the linkage rod, at least part of the swing rod is a control section with a square cross section, the control section is clamped between the two elastic pieces, and the two elastic pieces are suitable for limiting the rotation angle of the swing rod to be 90 °.

Optionally, the transmission assembly and the change-over switch assembly are respectively provided with two groups, and the two groups are respectively symmetrically arranged on two sides along the arrangement direction of the gasification pipes.

Optionally, the system further comprises a liquid nitrogen tank, the liquid nitrogen tank is connected with a liquid inlet of the gasifier through a liquid nitrogen input pipeline, and a gas outlet of the gasifier is connected with a nitrogen output pipeline.

The invention has the following advantages:

by utilizing the technical scheme of the invention, the change-over switch component can be matched with the inner ring of the transmission bearing, so that the transmission bearing is switched between a transmission state and an idle state. The transmission bearing in a transmission state can drive the deicing assembly to move along the gasification pipe; inner rings of the two transmission bearings are switched between a transmission state and an idle state in a staggered manner respectively, so that the deicing assembly can move back and forth along the gasification pipe, the deicing assembly can timely remove frost outside the gasification pipe, the running performance and the gasification effect of the gasifier are ensured, and the energy consumption of the gasifier is reduced. In addition, the change-over switch assembly is matched with the transmission bearing through a mechanical structure, a complex circuit, various electronic components and a controller are not needed for realization, the cost is low, the power consumption is low, and the operation is reliable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a liquid nitrogen gasification system according to an embodiment of the present invention;

FIG. 2 shows a top view of FIG. 1 (omitting the housing of FIG. 1);

FIG. 3 shows a schematic structural view of a drive bearing;

FIG. 4 is a schematic view of the first trigger lever cooperating with the first switching lever;

FIG. 5 is a schematic diagram showing the first drive bearing in a drive state and the second drive bearing in an idle state;

fig. 6 is a schematic view showing a structure in which the second trigger lever is engaged with the second switching lever;

FIG. 7 is a schematic diagram showing the first drive bearing in an idle state and the second drive bearing in a drive state;

FIG. 8 is a schematic view showing the structure of the elastic piece and the swing lever engaged;

fig. 9 shows a schematic structural diagram of a liquid nitrogen gasification system provided by an embodiment of the invention.

Description of reference numerals:

1. a vaporizer; 11. a gasification pipe; 12. a fin; 13. a connecting pipe; 2. a de-icing assembly; 21. an ice removing member; 211. deicing rings; 22. a linkage; 221. a linkage rod; 2211. an elastic sheet; 3. a drive mechanism; 31. a transmission assembly; 311. a lead screw; 3111. a first lead screw; 3112. a second lead screw; 312. a drive bearing; 3121. a first drive bearing; 3122. a second drive bearing; 313. a bearing seat; 314. a limiting convex edge; 315. a limiting groove; 316. a gear pair; 32. a motor; 4. a diverter switch assembly; 41. a switching element; 411. a swing lever; 4111. a control section; 412. a limiting rod; 4121. a first limit rod; 4122. a second limiting rod; 413. a switch lever; 4131. a first switching lever; 4132. a second switching lever; 42. a trigger; 421. a trigger lever; 4211. a first trigger lever; 4212. a second trigger lever; 5. a frame; 6. a liquid nitrogen tank; 61. a liquid inlet; 62. an air outlet; 7. a liquid nitrogen input pipeline; 8. and a nitrogen output pipeline.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

For convenience of describing the technical solution of the present invention, the following detailed description is made with reference to the accompanying drawings and specific examples, but the examples should not be construed as limiting the present invention.

Example 1

A liquid nitrogen gasification system comprises a gasifier 1, a deicing assembly 2, a driving mechanism 3 and a change-over switch assembly 4. Wherein, the gasifier 1 comprises a gasification pipe 11; the deicing assembly 2 comprises a deicing piece 21, the deicing piece 21 is arranged on the outer side of the gasification pipe 11, and a deicing gap is reserved between the deicing piece 21 and the outer side wall of the gasification pipe 11; the driving mechanism 3 comprises a transmission assembly 31, the transmission assembly 31 comprises two screw rods 311 which rotate reversely, two transmission bearings 312 which are respectively sleeved on the two screw rods 311, and a bearing seat 313; the outer rings of the two transmission bearings 312 are arranged on the bearing seat 313, and the inner rings of the two transmission bearings 312 are provided with threads matched with the lead screw 311 and are in threaded connection with the lead screw 311; the deicing member 21 is connected with the bearing seat 313; drive bearing 312 has a drive state in which the inner race is fixed and an idle state in which the inner race rotates; the driving bearing 312 in a driving state is adapted to drive the deicing member 21 to move along the axial direction of the gasification pipe 11; the two screw rods 311 which rotate reversely are suitable for driving the deicing component 21 to do reciprocating motion along the axial direction of the gasification pipe 11 so as to remove the frost in the deicing gap; the diverter switch assembly 4 cooperates with the inner race of the drive bearing 312 and is adapted to control the inner race of the drive bearing 312 to switch between a drive state and an idle state.

With the technical solution of the present invention, the diverter switch assembly 4 can be engaged with the inner race of the drive bearing 312 to switch between a drive state and an idle state. The driving bearing 312 in a driving state can drive the deicing assembly 2 to move along the gasification pipe 11; the inner rings of the two transmission bearings 312 are switched between a transmission state and an idle state in a staggered manner, so that the deicing assembly 2 can move back and forth along the gasification pipe 11, the deicing assembly 2 can timely remove frost outside the gasification pipe 11, the running performance and the gasification effect of the gasifier 1 are ensured, and the energy consumption of the gasifier 1 is reduced. In addition, the change-over switch assembly 4 is matched with the transmission bearing 312 through a mechanical structure, and a complex circuit and a controller are not needed for realization, so that the cost is low, the power consumption is low, and the operation is reliable.

Specifically, the gasifier comprises a frame 5, and the gasifier 1 and the driving mechanism 3 are both arranged on the frame 5; a plurality of gasification pipes 11 are arranged in parallel, and two adjacent gasification pipes 11 are sequentially connected in series and communicated through a bent connecting pipe 13. The two screw rods 311 are parallel to the gasification pipe 11 and are arranged on the frame 5 in parallel in a rotatable manner; each gasification pipe 11 is provided with an ice removal piece 21, and the ice removal pieces 21 are used for removing frost on the outer side wall of each gasification pipe 11; the deicing assembly 2 further comprises a linkage 22, the plurality of deicing members 21 are all connected with the linkage 22, and the bearing seat 313 is connected with the linkage 22 so as to drive the plurality of deicing members 21 to synchronously reciprocate along the axial direction of the gasification pipe 11.

Further, the deicing member 21 includes a deicing ring 211, the deicing ring 211 is sleeved on the gasification pipe 11, and the deicing gap is formed between the inner side wall of the deicing ring 211 and the outer side wall of the gasification pipe 11; the linkage 22 comprises a linkage rod 221, and the ice removing rings 211 are connected into a whole through the linkage rod 221.

Further, referring to fig. 2, fins 12 are arranged on the gasification tube 11, the inner contour of the deicing ring 211 is matched with the outer contour of the fins 12, the deicing ring 211 is sleeved on the gasification tube 11 and the fins 12, and the deicing gap includes a gap between the deicing ring 211 and the outer side wall of the gasification tube 11, and a gap between the deicing ring 211 and the fins 12. In this embodiment, the fins 12 are long sheets, 6 fins 12 are provided, the length of each fin 12 is equal to the length of the vaporizing tube 11, the long sides of the fins 12 are in contact with the outer wall of the vaporizing tube 11, and the 6 fins 12 are provided at regular intervals radially around the outer periphery of the vaporizing tube 11. Except that the ice ring 211 is sleeved on the gasification tube 11 and the fins 12, the intervals between the ice ring 211 and the gasification tube 11 and between the ice ring 211 and the fins 12 are equal, that is, the inner contour of the ice ring 211 is adapted to the outer contour of the combination of the gasification tube 11 and the fins 12. Specifically, 4-36 gasification pipes 11 are arranged, the length of each gasification pipe 11 is 4-10 cm, 6-8 fins 12 are arranged, the thickness of each fin 12 is 1-3 mm, and the width of each deicing gap is 1-2 mm. Of course, in some other embodiments, the inner side wall of the deicing ring 211 may be provided with a brush for brushing away frost on the gasification pipe 11 and the fins 12, so as to enhance the deicing effect.

The switch assembly 4 includes a switch member 41 and a trigger member 42, the switch member 41 having a locked position and an unlocked position, the trigger member 42 being adapted to drive the switch member 41 to move between the locked position and the unlocked position.

The inner ring of the transmission bearing 312 is provided with a first limiting structure, the switching piece 41 is provided with a second limiting structure matched with the first limiting structure, the switching piece 41 is located at a locking position, and the second limiting structure is suitable for being clamped and locked with the first limiting structure, so that the transmission bearing 312 is in a transmission state; the switch member 41 is in the unlocking position, and the second limit structure is adapted to be separated from the first limit structure for unlocking, so that the inner ring of the transmission bearing 312 is in an idle state.

Referring to fig. 3, the first limiting structure includes a limiting convex edge 314 disposed on the inner ring of the driving bearing 312 and protruding from the outer ring of the driving bearing 312 along the axial direction thereof, and at least one limiting groove 315 disposed on the limiting convex edge 314; in a preferred embodiment, the limiting convex edge 314 is provided with a plurality of limiting grooves 315, and the limiting grooves 315 are spaced around the limiting convex edge 314.

The switching piece 41 comprises a swinging rod 411, and the swinging rod 411 is rotatably connected with the linkage rod 221; the second limiting structure comprises a limiting rod 412 arranged on the swinging rod 411, referring to fig. 5, the limiting rod 412 is clamped in the limiting groove 315 to enable the transmission bearing 312 to be in a transmission state, and swings away from the limiting groove 315 to enable the transmission bearing 312 to be in an idle state; the limiting rod 412 is clamped in the limiting groove 315, the inner ring of the transmission bearing 312 cannot rotate, the outer ring of the transmission bearing 312 is fixed on the bearing seat 313, so that the outer ring of the transmission bearing 312 is fixed and does not rotate, the inner ring of the transmission bearing 312 is also limited and cannot rotate, at the moment, the inner ring of the transmission bearing 312 is in threaded fit with the lead screw 311, the lead screw 311 rotates, the transmission bearing 312 can linearly move along the lead screw 311 under the driving force of threads, the bearing seat 313, the linkage rod 221 and the deicing ring 211 are driven to synchronously move, and the deicing rings 211 axially move along the gasification pipe 11. In one transmission assembly 31, two transmission bearings 312 are arranged, so that the two transmission bearings 312 are respectively driven, and the forward and reverse rotation of the lead screw 311 drives the deicing ring 211 to reciprocate along the gasification pipe 11.

Two lead screws 311 in the transmission assembly 31 are a first lead screw 3111 and a second lead screw 3112 respectively, correspondingly, two transmission bearings 312 correspondingly sleeved on the first lead screw 3111 and the second lead screw 3112 are a first transmission bearing 3121 and a second transmission bearing 3122 respectively, when an inner ring of the first transmission bearing 3121 is in a transmission state, an inner ring of the second transmission bearing 3122 is in an idle rotation state, that is, a second limit structure of the switch assembly 4 is in a clamping fit with a first limit structure of the first transmission bearing 3121, specifically, the limit rod 412 is clamped in the limit groove 315 of the first transmission bearing 3121, so as to limit rotation of the inner ring of the first transmission bearing 3121, but not limit rotation of the inner ring of the second transmission bearing 3122, because the inner ring of the second transmission bearing 3122 is in a free state, when the second lead screw 2 rotates, the second transmission bearing 3122 is fixed on the bearing seat 313, the transmission bearings 3112 and the second transmission bearing 3122 are in a threaded fit, so as to drive the inner ring of the second transmission bearing 3122, thereby the outer ring of the transmission bearing 3122 rotates, the linkage ring 3121 does not drive the ice removing bearing, and the ice removing linkage ring 211. The first lead screw 3111 rotates positively, and the deicing ring 211 moves from the first end of the gasification pipe 11 to the second end of the gasification pipe 11 in a positive deicing stroke; the second lead screw 3112 is reversed and the de-icing ring 211 is moved from the second end of the gasification tube 11 to the first end of the gasification tube 11 in a reverse de-icing stroke. The first transmission bearing 3121 drives the deicing ring 211 to complete a forward deicing stroke, and the second transmission bearing 3122 drives the deicing ring 211 to complete a reverse deicing stroke.

Further, the limiting rod 412 is disposed between the driving bearings 312, and one limiting rod 412 is disposed and adapted to be clamped in the limiting groove 315 of any driving bearing 312 by swinging in a staggered manner. The limiting rod 412 is in clamping fit with the inner ring of the first transmission bearing 3121, so that the first transmission bearing 3121 is kept in a transmission state, the inner ring of the second transmission bearing 3122 is in an idle rotation state, when the first transmission bearing 3121 drives the deicing ring 211 to complete a forward deicing stroke, the limiting rod 412 rotates 180 degrees, the limiting rod 412 is switched to be in clamping fit with the inner ring of the second transmission bearing 3122, so that the inner ring of the second transmission bearing 3122 is kept in the transmission state, the inner ring of the first transmission bearing 3121 is in the idle rotation state, at the moment, the second transmission bearing 3122 drives the deicing ring 211 to move reversely, when the second transmission bearing 3122 drives the deicing ring 211 to complete a reverse deicing stroke, the limiting rod 412 rotates 180 degrees again, the switching position is in clamping fit with the inner ring of the first transmission bearing 3121, the forward deicing stroke starts again, and the steps are repeated in such a way, so as to realize deicing. The swing of the limiting rod 412 is realized through a motor and a gear pair, specifically, the limiting rod 412 is connected with a driven gear in the gear pair, the axis of the limiting rod 412 is perpendicular to the axis of the driven gear, and the motor rotates forward and backward to drive the limiting rod 412 to swing back and forth. Of course, other mechanisms that can achieve the back-and-forth swing of the limiting rod 412 in the prior art can be used in the present embodiment, and are not limited herein.

As an alternative embodiment, in this embodiment, two limiting rods 412 are provided, and are adapted to be alternately and respectively engaged in the limiting grooves 315 of the two driving bearings 312. Specifically, the two limiting rods 412 are respectively a first limiting rod 4121 suitable for being in clamping fit with an inner ring of the first transmission bearing 3121 and a second limiting rod 4122 suitable for being in clamping fit with an inner ring of the second transmission bearing 3122, the first limiting rod 4121 and the second limiting rod 4122 are perpendicular, the first limiting rod 4121 and the second limiting rod 4122 are both connected to one swinging rod 411, the first limiting rod 4121, the second limiting rod 4122 and the swinging rod 411 are perpendicular to each other, the first limiting rod 4121 and the second limiting rod 4122 are intersected at the same point of the swinging rod 411, that is, the first limiting rod 4121 and the second limiting rod 4122 are coplanar and perpendicular. Referring to fig. 4 in conjunction with fig. 5, when the first stopper 4121 is engaged with the inner ring of the first transmission bearing 3121, the second stopper 4122 is disengaged from the second transmission bearing 3122, and the inner ring of the second transmission bearing 3122 is in an idle state. When the deicing ring 211 completes one positive deicing stroke, the swinging rod 411 rotates 90 degrees, as seen from the orientation of fig. 5, the swinging rod 411 rotates 90 degrees clockwise, the first limiting rod 4121 and the first transmission bearing 3121 are gradually separated, the limiting locking relationship is released, and the inner ring of the first transmission bearing 3121 is switched from the transmission state to the idle state. Meanwhile, referring to fig. 7, the second limiting rod 4122 swings to be in clamping fit with the limiting groove 315 of the second transmission bearing 3122, and the inner ring of the second transmission bearing 3122 is switched from an idle rotation state to a transmission state, so that the deicing ring 211 can be driven to move reversely, that is, the deicing ring 211 is driven to start a reverse deicing stroke. When the deicing ring 211 finishes a reverse deicing stroke, the swinging rod 411 rotates in a reverse direction by 90 degrees, as seen from the orientation of fig. 7, the swinging rod 411 rotates counterclockwise by 90 degrees, the second limiting rod 4122 and the second transmission bearing 3122 are gradually separated, the limiting locking relationship is released, the inner ring of the second transmission bearing 3122 is switched from the transmission state to the idle state, the first transmission bearing 3121 is switched from the idle state to the transmission state, the forward deicing stroke is started again, and the above steps are repeated, so that the deicing of the gasification pipe 11 is realized.

Furthermore, two triggering pieces 42 are arranged and are respectively fixedly arranged on the machine frame 5 at two ends of the gasification pipe 11; both the triggering parts 42 are adapted to cooperate with the switching part 41 to drive the limiting rod 412 to swing, so that the inner ring of the transmission bearing 312 is switched between the transmission state and the idle state.

Further, the triggering member 42 includes a triggering rod 421, one end of the triggering rod 421 is connected to the frame 5, and the other end extends toward the switching member 41; the switching member 41 includes a switching lever 413 provided on the swinging lever 411; the switching rod 413 and the limiting rod 412 are arranged on the swinging rod 411 at intervals, and when the switching rod 413 moves along the lead screw 311 along with the linkage rod 221 to be abutted against the trigger rod 421, the trigger rod 421 pushes the switching rod 413 to drive the swinging rod 411 to swing. Referring to fig. 1, two trigger rods 421 in the change-over switch assembly 4 are respectively disposed at two ends of the frame 5, one end of each trigger rod 421 is fixedly connected to the frame 5, and the other end of each trigger rod 421 vertically extends to form a free end. Since the stopper lever 412 needs to swing between the first transmission bearing 3121 and the second transmission bearing 3122, the swing lever 411 is provided between the two transmission bearings 312. Since the switching lever 413 is provided on the swinging lever 411 and the trigger lever 421 is engaged with the switching lever 413, the trigger lever 421 is also provided between the two lead screws 311. In the orientation of fig. 1, the first ends of the gasification pipe 11 and the frame 5 are lower ends, the second ends of the gasification pipe 11 and the frame 5 are upper ends, the trigger bar 421 at the first end of the frame 5 is a first trigger bar 4211, the trigger bar 421 at the second end of the frame 5 is a second trigger bar 4212, the first trigger bar 4211 is adapted to cooperate with the first switching bar 4131, and the second trigger bar 4212 is adapted to cooperate with the second switching bar 4132. A fork is provided at an end of the trigger lever 421 so that the trigger lever 421 pushes the switching lever 413 to swing the swing lever 411.

In this embodiment, the oscillating rod 411 moves synchronously with the linkage rod 221, when the deicing ring 211 completes a forward deicing stroke, the linkage rod 221 and the oscillating rod 411 both move synchronously from the first end of the gasification pipe 11 to the second end of the gasification pipe 11, the oscillating rod 411 is driven by the trigger rod 421 on the rack 5 disposed at the second end to rotate by 90 °, so that the inner ring of the second transmission bearing 3122 switches the transmission state, the oscillating rod 411 and the linkage rod 221 move synchronously with the deicing ring 211, when the deicing ring 211 completes a reverse deicing stroke, both the oscillating rod 411 and the linkage rod 221 move from the second end of the gasification pipe 11 to the first end of the gasification pipe 11, the oscillating rod 411 is driven by the trigger rod 421 on the rack 5 disposed at the first end to rotate reversely by 90 °, so that the inner ring of the first transmission bearing 3121 switches to the transmission state, and the cycle is repeated.

The swing lever 411 is provided with two switching levers 413 which are a first switching lever 4131 and a second switching lever 4132 respectively, the first switching lever 4131 and the second switching lever 4132 are both perpendicular to the swing lever 411, the first switching lever 4131 and the second switching lever 4132 are perpendicular to each other, that is, the first switching lever 4131 and the second switching lever 4132 intersect the swing lever 411 at different points respectively, the first switching lever 4131 and the second switching lever 4132 are staggered, and correspondingly, the first trigger lever 4211 engaged with the first switching lever 4131 and the second trigger lever 4212 engaged with the second switching lever 4132 are also staggered in the direction along the swing lever 411 to prevent mutual interference therebetween. Referring to fig. 4 or 6, the first switching lever 4131 and the second limiting lever 4122 are disposed in parallel on the same side of the swing lever 411, and the second switching lever 4132 and the first limiting lever 4121 are disposed in parallel on two sides of the swing lever 411.

Further, referring to fig. 8, 8-1 in fig. 8 shows a front view of the connection relationship of the linkage rod 221 and the elastic sheet 2211, and 8-2 in fig. 8 shows a side perspective view of the connection relationship of the linkage rod 221 and the elastic sheet 2211. Two elastic sheets 2211 arranged in parallel are arranged on the linkage rod 221, at least part of the swing rod 411 is a control section 4111 with a square cross section, the control section 4111 is clamped between the two elastic sheets 2211, and the two elastic sheets 2211 are suitable for limiting the rotation angle of the swing rod 411 to be 90 degrees. Since the control segment 4111 is limited between the two elastic pieces 2211, when the trigger lever 421 drives the swing lever 411 to rotate by driving the switching lever 413, the angle of each rotation of the swing lever 411 is 90 ° under the limiting action of the elastic pieces 2211. As shown in fig. 8-1, 8, in the present embodiment, the swing lever 411 is a rectangular lever having a square cross section.

Furthermore, two sets of transmission assemblies 31 and two sets of selector switch assemblies 4 are respectively and symmetrically arranged on two sides of the arrangement direction of the gasification tubes 11. Referring to fig. 1, that is, two lead screws 311 are respectively disposed on two sides of the gasification pipe 11, and there are 4 lead screws 311, wherein the two lead screws 311 located on the outer side, i.e., the two lead screws 311 far away from the gasification pipe 11 and the transmission bearings 312 thereon, form a forward transmission set, and the two lead screws 311 located on the inner side, i.e., the two lead screws 311 near the gasification pipe 11 and the transmission bearings 312 thereon, form a reverse transmission set. The two lead screws 311 of the forward transmission set rotate in the same direction, i.e. in the forward direction, and the two lead screws 311 of the reverse transmission set rotate in the same direction but rotate in the opposite direction to the two lead screws 311 of the forward transmission set. Referring to fig. 1, the screw 311 of the forward transmission set and the screw 311 of the reverse transmission set are driven by a pair of gear pairs 316 to realize reverse rotation. In this embodiment, the two lead screws 311 of the reverse transmission set are driven by the motor 32 through chain and sprocket transmission, so as to realize synchronous rotation. Two ends of the linkage rod 221 are respectively connected with two bearing seats 313. Accordingly, the two first stopper rods 4121 and the two second stopper rods 4122 are symmetrically arranged. Of course, as an alternative embodiment, the two lead screws 311 of the forward transmission set are driving lead screws 311, and the two lead screws 311 in the same transmission set rotate in the same direction through the transmission of the motor 32 through a belt and a pulley.

Of course, in some other embodiments, only one transmission assembly 31 and one switch assembly 4 are provided, and the first end of the linkage rod 221 is connected to the bearing seat 313, and the second end is connected to the guide mechanism. The guide mechanism comprises a guide slide way arranged along the gasification pipe 11, the second end of the linkage rod 221 is connected with a slide block, and the slide block is slidably arranged in the guide slide way.

Further, referring to fig. 9, the liquid nitrogen gasification system further includes a liquid nitrogen tank 6, the liquid nitrogen tank 6 is connected with a liquid inlet 61 of the gasifier 1 through a liquid nitrogen input pipeline 7, and a gas outlet 62 of the gasifier 1 is connected with a nitrogen output pipeline 8 and is input into a workshop buffer tank for caching for later use.

The working process comprises the following steps:

the motor 32 is turned on, the motor 32 rotates, and the two lead screws 311 in the reverse transmission set are driven to rotate through chain transmission of the chain wheel, that is, the second lead screw 3112 rotates, and through transmission of the gear pair 316, the two first lead screws 3111 are driven to rotate in a reverse direction with the second lead screw 3112. The rotation directions of the first lead screw 3111 and the second lead screw 3112 are not changed, and the two transmission bearings 312 are controlled to transmit respectively by the switch.

The first limit rod 4121 is clamped in the clamping groove of the first transmission bearing 3121, the inner ring of the first transmission bearing 3121 is in a transmission state, the first lead screw 3111 rotates forward to drive the first transmission bearing 3121 to move upward, when the deicing ring 211 approaches the second end of the gasification tube 11, a forward deicing stroke is to be completed, referring to fig. 4, at this time, the second trigger rod 4212 located at the second end of the rack 5 contacts with the second switching rod 4132, the second switching rod 4132 is pushed downward by the second trigger rod 4212 in the process of continuing to move upward to drive the swinging rod 411 to rotate clockwise, as the swinging rod 411 is limited by the elastic sheet 2211, the swinging rod 411 rotates clockwise by 90 degrees, during the period, the first limit rod 4121 is separated from the limit transmission groove 315 of the first transmission bearing 3121, the first limit rod 4121 rotates by 90 degrees, the horizontal state is changed to the vertical state, the inner ring of the first transmission bearing 3121 is changed from the idle transmission state to the idle rotation state, meanwhile, the second limit rod 31122 rotates clockwise from the transmission groove 31190 degrees, the transmission groove 3112 is changed from the horizontal state, the idle rotation state, the second limit rod 3122 rotates clockwise, the second lead screw 311211 and the second lead screw 3122 rotates from the link bearing 3122, the second lead screw and the reverse connection state, the second lead screw 3122 rotates by the reverse connection state. When the ring 211 to be deiced approaches the first end of the gasification tube 11, a reverse deicing stroke is to be completed, referring to fig. 6, the first switching rod 4131 contacts the first trigger rod 4211, the first oscillating rod 411 continues to descend, the first switching rod 4131 is pushed by the first trigger rod 4211 to ascend in the process of continuing to descend, so as to drive the oscillating rod 411 to rotate counterclockwise, since the oscillating rod 411 is limited by the elastic sheet 2211, the oscillating rod 411 rotates 90 ° counterclockwise, during the period, the second limiting rod 4122 is separated from the limiting groove 315 of the second transmission bearing 3122, the second limiting rod 4122 rotates 90 ° counterclockwise, the horizontal state is changed into the vertical state, the inner ring of the second transmission bearing 3122 is changed from the transmission state into the idle state, meanwhile, the first limiting rod 4121 rotates 90 ° counterclockwise, the vertical state is changed into the horizontal state, and is clamped with the limiting groove 315 of the first transmission bearing 3121, so that the inner ring of the first transmission bearing 3121 is changed from the idle state into the transmission state, so as to drive the ring 211 to perform a forward deicing stroke again and repeatedly.

According to the above description, the present patent application has the following advantages:

1. the circulating deicing can be realized, and the time and the labor are saved;

2. the transmission bearing 312 is ingenious in structural design, is matched with the change-over switch assembly 4 through a mechanical limit structure to realize state switching, and is low in cost, low in power consumption and high in reliability compared with an electric control travel switch control scheme.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims

1. A liquid nitrogen gasification system, comprising:

a gasifier (1) comprising a gasification tube (11);

the deicing assembly (2) comprises a deicing piece (21), the deicing piece (21) is arranged on the outer side of the gasification pipe (11), and a deicing gap is reserved between the deicing piece (21) and the outer side wall of the gasification pipe (11);

the driving mechanism (3) comprises a transmission assembly (31), wherein the transmission assembly (31) comprises two screw rods (311) rotating reversely, two transmission bearings (312) respectively sleeved on the two screw rods (311) and a bearing seat (313); the outer rings of the two transmission bearings (312) are arranged on the bearing seat (313), and the inner rings of the two transmission bearings (312) are provided with threads matched with the lead screw (311) and are in threaded connection with the lead screw (311); the deicing member (21) is connected with the bearing seat (313);

the transmission bearing (312) has a transmission state that the inner ring is fixed and an idle rotation state that the inner ring rotates; the transmission bearing (312) in the transmission state is suitable for driving the deicing component (21) to move along the axial direction of the gasification pipe (11); the two screw rods (311) which rotate in opposite directions are suitable for driving the deicing component (21) to do reciprocating motion along the axial direction of the gasification pipe (11) so as to remove frost in the deicing gap;

a diverter switch assembly (4) cooperating with the inner race of the drive bearing (312) and adapted to control the inner race of the drive bearing (312) to switch between a drive state and an idle state.

2. The liquid nitrogen gasification system according to claim 1, further comprising a frame (5), wherein the gasifier (1) and the driving mechanism (3) are both arranged on the frame (5); a plurality of gasification pipes (11) are arranged in parallel, and two screw rods (311) are parallel to the gasification pipes (11) and are rotatably arranged on the rack (5) in parallel; the deicing component (21) is arranged on each gasification pipe (11); the deicing assembly (2) further comprises a linkage piece (22), the deicing pieces (21) are connected with the linkage piece (22), and the bearing seat (313) is connected with the linkage piece (22) to drive the deicing pieces (21) to reciprocate along the axial direction of the gasification pipe (11).

3. The liquid nitrogen gasification system of claim 2, wherein the deicing member (21) comprises a deicing ring (211), and the deicing ring (211) is sleeved on the gasification pipe (11); the linkage piece (22) comprises a linkage rod (221), and the deicing rings (211) are connected into a whole through the linkage rod (221).

4. The liquid nitrogen gasification system according to claim 3, wherein fins (12) are arranged on the gasification tube (11), the inner contour of the deicing ring (211) is matched with the outer contour of the fins (12), the deicing ring (211) is sleeved on the gasification tube (11) and the fins (12), and the deicing gaps comprise gaps between the deicing ring (211) and the outer side wall of the gasification tube (11) and gaps between the deicing ring (211) and the fins (12).

5. Liquid nitrogen gasification system according to claim 4, characterized in that the diverter switch assembly (4) comprises a switch (41) and a trigger (42), the switch (41) having a locked position and an unlocked position, the trigger (42) being adapted to drive the switch (41) to move between the locked position and the unlocked position;

a first limiting structure is arranged on an inner ring of the transmission bearing (312), the switching piece (41) is provided with a second limiting structure matched with the first limiting structure, the switching piece (41) is located at the locking position, and the second limiting structure is suitable for being clamped and locked with the first limiting structure, so that the transmission bearing (312) is located in the transmission state; the switching piece (41) is located at the unlocking position, and the second limiting structure is suitable for being separated from the first limiting structure to be unlocked, so that the inner ring of the transmission bearing (312) is located in the idling state.

6. The liquid nitrogen gasification system of claim 5,

the first limiting structure comprises a limiting convex edge (314) which is arranged on the inner ring of the transmission bearing (312) and protrudes out of the outer ring of the transmission bearing (312) along the axial direction of the limiting convex edge, and at least one limiting groove (315) which is arranged on the limiting convex edge (314);

the switching piece (41) comprises a swinging rod (411), and the swinging rod (411) is rotationally connected with the linkage rod (221); the second limiting structure comprises a limiting rod (412) arranged on the swinging rod (411), the limiting rod (412) is clamped in the limiting groove (315), the transmission bearing (312) is in the transmission state, and the second limiting structure swings away from the limiting groove (315), so that the transmission bearing (312) is in the idle state;

the limiting rod (412) is arranged between the transmission bearings (312), and one limiting rod (412) is suitable for being clamped in the limiting groove (315) of any transmission bearing (312) in a staggered manner through swinging; or two limiting rods (412) are arranged and are suitable for being clamped in the limiting grooves (315) of the two transmission bearings (312) in a staggered manner.

7. The liquid nitrogen gasification system according to claim 6, wherein the trigger (42) is provided with two parts and is respectively fixed on the frame (5) at two ends of the gasification pipe (11);

the two trigger pieces (42) are suitable for being matched with the switching piece (41) to drive the limiting rod (412) to swing, so that the inner ring of the transmission bearing (312) is switched between a transmission state and an idle rotation state.

8. The liquid nitrogen gasification system of claim 7,

the trigger piece (42) comprises a trigger rod (421), one end of the trigger rod (421) is connected with the rack (5), and the other end of the trigger rod extends towards the switching piece (41);

the switching piece (41) further comprises a switching rod (413) arranged on the swinging rod (411); the switching rod (413) and the limiting rod (412) are arranged on the swinging rod (411) at intervals, when the switching rod (413) moves along the lead screw (311) along with the linkage rod (221) to be abutted to the trigger rod (421), the trigger rod (421) pushes the switching rod (413) to drive the swinging rod (411) to swing.

9. The liquid nitrogen gasification system according to claim 8, wherein the swing rod (411) is provided with two limiting rods (412), namely a first limiting rod (4121) and a second limiting rod (4122), the first limiting rod (4121) is suitable for being locked with one of the driving bearings (312) on the bearing seat (313) in a clamping manner, and the second limiting rod (4122) is suitable for being locked with the other driving bearing (312) on the bearing seat (313) in a clamping manner; the first limiting rod (4121) and the second limiting rod (4122) are perpendicular to the swinging rod (411), and the first limiting rod (4121) and the second limiting rod (4122) are coplanar and perpendicular;

the swing rod (411) is provided with two switching rods (413), namely a first switching rod (4131) and a second switching rod (4132), the first switching rod (4131) and the second switching rod (4132) are perpendicular to the swing rod (411), and the first switching rod (4131) and the second switching rod (4132) are perpendicular to different surfaces.

10. The liquid nitrogen gasification system of claim 9, wherein the linkage rod (221) is provided with two elastic pieces (2211) arranged in parallel, the swing rod (411) is at least partially a control section (4111) with a square cross section, the control section (4111) is clamped between the two elastic pieces (2211), and the two elastic pieces (2211) are suitable for limiting the rotation angle of the swing rod (411) to 90 °.

11. The liquid nitrogen gasification system according to any one of claims 1 to 10, wherein two sets of the transmission assembly (31) and the change-over switch assembly (4) are provided, and are symmetrically provided on two sides along the arrangement direction of the gasification pipes (11).

12. The liquid nitrogen gasification system according to claim 1, further comprising a liquid nitrogen tank (6), wherein the liquid nitrogen tank (6) is connected with the liquid inlet (61) of the gasifier (1) through a liquid nitrogen input pipeline (7), and the gas outlet (62) of the gasifier (1) is connected with the nitrogen output pipeline (8).