CN113685627A

CN113685627A - Steel bushing for exhaust pipe of low-temperature refrigeration equipment

Info

Publication number: CN113685627A
Application number: CN202111250682.8A
Authority: CN
Inventors: 吴晓强
Original assignee: Nantong Baoxue Refrigeration Equipment Co ltd
Current assignee: Nantong Baoxue Refrigeration Equipment Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2021-11-23
Anticipated expiration: 2041-10-26
Also published as: CN113685627B

Abstract

The invention discloses a steel sleeve for an exhaust pipe of a low-temperature refrigeration equipment, comprising a steel sleeve for connecting two exhaust pipes, two fixing rings are fixed on the inner wall of the steel sleeve, and the inner wall of the steel sleeve is slidably installed There are two sliding rings, and the two sliding rings are respectively located on one side of the back of the two fixed rings, and the outer walls of the back of the two fixed rings and the outer walls of the opposite sides of the two sliding rings are respectively installed with annular clamping In the bag, the two exhaust pipes are respectively inserted from the two ends of the steel sleeve and abut against each other, and also includes a driving component for driving the two sliding rings to move relative or opposite. The present invention facilitates quick splicing of the two exhaust pipes through the cooperation between the structures, and at the same time has a sealing effect between the two exhaust pipes, and can also pass the temperature change during the use of the refrigeration equipment. , to achieve the effect of dynamically adjusting the clamping and sealing performance.

Description

Steel bushing for exhaust pipe of low-temperature refrigeration equipment

Technical Field

The invention relates to the technical field of low-temperature refrigeration equipment, in particular to a steel sleeve for an exhaust pipe of the low-temperature refrigeration equipment.

Background

The blast pipe of low temperature refrigeration plant adopts the steel pipe mostly, low temperature refrigeration plant is when connecting the blast pipe, most of all connect through the steel bushing, but current steel cover is when connecting the blast pipe, most of all set up the screw thread through the outer wall, then rethread threaded connection, the steel bushing of being not convenient for like this docks fast to the blast pipe, thereby extravagant operating time, efficiency when reducing the installation, and still need set up the screw thread at the outer wall of blast pipe, the process has been increased, therefore, the steel bushing that can dock the blast pipe fast becomes the problem that needs to solve at present urgently.

Disclosure of Invention

The invention aims to provide a steel sleeve for an exhaust pipe of low-temperature refrigeration equipment, which has the advantage of being convenient for quickly splicing two exhaust pipes and solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a steel bushing for blast pipe of low temperature refrigeration plant, is including the steel bushing that is used for connecting two blast pipes, the inner wall of steel bushing is fixed with two solid fixed rings, the inner wall slidable mounting of steel bushing has two slip rings, and two the slip ring is located one side at two solid fixed ring looks backs respectively, two the outer wall at solid fixed ring looks back and the outer wall of two slip ring opposite faces are installed the tight bag of annular clamp respectively, two the blast pipe inserts and offsets from the both ends of steel bushing respectively.

The driving assembly is used for driving the two sliding rings to move oppositely or oppositely.

Preferably, two grooves are formed in the inner wall of the steel sleeve between the two fixing rings, the sealing rings are installed in the two grooves, annular cavities and two annular cavities are formed in the sealing rings, the outer walls of the inner rings of the sealing rings are in contact with the outer walls of the two exhaust pipes respectively, the outer walls of the sealing rings are communicated with communicating pipes, and the ends, away from the sealing rings, of the communicating pipes are fixed to the outer walls of the two annular clamping bags respectively and are communicated with the inner cavities of the two annular clamping bags.

Preferably, the drive assembly includes two hollow tubes that can move relatively or back to back of the body, two the hollow tube is slidable mounting respectively two the steel bushing inner wall at the slip ring looks back, two equal slidable mounting in inner wall of hollow tube has the piston ring, two the outer wall that the piston ring is close to the slip ring all is fixed with the ejector pin, two the through-hole has all been seted up to the outer wall of hollow tube opposite face, two the one end that two through-holes were worn out to the ejector pin is fixed respectively at the outer wall of two slip rings, two the outer wall that the piston ring is close to the slip ring is fixed with memory alloy with the inner wall of two hollow tubes respectively, memory alloy can shorten along with the temperature reduction.

Preferably, the outer walls of the two piston rings at the back sides are both fixed with connecting rods, the outer walls of the two hollow tube at the back sides are both provided with through holes through which the connecting rods can penetrate out, one ends of the two connecting rods penetrating out are both fixed with limiting rings, and the outer walls of the two limiting rings are both provided with clamping mechanisms.

Clamping mechanism includes that two at least logical grooves of seting up at the spacing ring outer wall, and logical inslot slidable mounting respectively has kicking block and briquetting, just the briquetting contacts with the outer wall of blast pipe, be connected with the spring between kicking block and the briquetting, the scarf with scarf phase adaptation has all been seted up to the inner wall at steel bushing both ends, the inclined plane with scarf phase adaptation is seted up at the top of kicking block.

Preferably, the steel bushing is close to the outer wall of two hollow tubes and has all seted up the spout, and equal slidable mounting has the screw thread piece in two spouts, two the outer wall at two hollow tubes is fixed respectively to the one end of screw thread piece, the outer wall at steel bushing both ends all is fixed with the axle bed, two the axle center of axle bed rotates jointly and installs two-way screw rod, two-way screw rod runs through two screw thread pieces, and respectively with the department threaded connection that runs through of two screw thread pieces, works as two-way screw rod can drive two screw thread pieces and do relative or back on the back removal when rotating.

Preferably, a handle is fixed at one end of the bidirectional screw rod penetrating through one of the shaft seats.

Preferably, the outer walls of the inner rings of the two annular clamping bags are both provided with frosting surfaces.

Preferably, the contact surface of the pressing block and the exhaust pipe is a frosted surface.

Compared with the prior art, the invention has the following beneficial effects:

the two exhaust pipes are clamped and fixed through the inner rings of the two annular clamping bags through the matching of the structures, so that the two exhaust pipes can be conveniently and quickly spliced, and the two annular clamping bags can play a certain sealing role between the two exhaust pipes and the steel sleeve after being expanded.

Through the matching between the structures, the air in the annular clamping bags is extruded into the sealing ring through the communicating pipe while the two annular clamping bags are extruded, and the sealing ring can expand to clamp the exhaust pipes and seal the two exhaust pipes, so that the sealing effect between the two exhaust pipes is achieved.

Thirdly, through the matching between the structures, when the refrigeration equipment is in the refrigeration process, due to the temperature reduction, the annular clamping bag is extruded again through the matching between the structures, the annular clamping bag is further deformed to clamp and fix the exhaust pipe, meanwhile, the sealing ring can be inflated again, so that the sealing ring is always kept in an expanded state, the sealing property is further improved, because the air in the sealing ring and the air in the annular clamping bag can shrink under the action of thermal expansion and cold contraction, the volumes of the annular clamping bag and the sealing ring are reduced, the sealing effect of the sealing ring and the fixing effect of the annular clamping bag are avoided being influenced, and because the sealing ring can shrink, the inner ring of the sealing ring can shrink, so that the sealing ring has a wrapping force on the outer wall of the exhaust pipe, then the sealing ring is inflated again with air, and the sealing ring can increase the sealing effect, can also further play fixed effect to the blast pipe, moreover when refrigeration plant stop to use the back, the temperature of blast pipe can resume the room temperature gradually, and memory alloy can lengthen reconversion this moment, can prevent that the air expend with heat and contract with cold and expand brokenly with the tight bag of annular clamp and sealing washer to reach one and can the dynamic adjustment press from both sides tight and sealing performance's effect.

Drawings

FIG. 1 is a front isometric view of the present invention;

FIG. 2 is a schematic structural diagram in elevation and section view according to the present invention;

FIG. 3 is a schematic cross-sectional perspective view taken along A-A of FIG. 2 of the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 2B;

FIG. 5 is a schematic perspective view of the present invention shown in FIG. 2;

fig. 6 is an enlarged view of the structure of fig. 5 at C according to the present invention.

In the figure: 1. steel jacket; 2. a bidirectional screw; 3. a thread block; 4. a shaft seat; 5. a limiting ring; 6. a fixing ring; 7. an annular clamping bladder; 8. a slip ring; 9. a seal ring; 10. a communicating pipe; 11. a top rod; 12. a piston ring; 13. a hollow tube; 14. a connecting rod; 15. a top block; 16. briquetting; 17. a spring; 18. a memory alloy; 19. a wedge groove; 20. and (4) exhausting the gas.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, the present invention provides a technical solution: the utility model provides a steel bushing for blast pipe of low temperature refrigeration plant, is including steel bushing 1 that is used for connecting two blast pipes 20, the inner wall of steel bushing 1 is fixed with two solid fixed rings 6, the inner wall slidable mounting of steel bushing 1 has two slip rings 8, and two slip rings 8 are located two one sides at solid fixed ring 6 looks backs respectively, the outer wall at two solid fixed ring 6 looks backs and the outer wall of two slip ring 8 opposite faces are installed the tight bag 7 of annular clamp respectively, two blast pipes 20 insert and offset from the both ends of steel bushing 1 respectively.

And the device also comprises a driving component for driving the two sliding rings 8 to move oppositely or oppositely.

Insert and offset two blast pipes 20 respectively from the both ends of steel bushing 1, then do relative motion through two slip rings 8 of drive assembly drive, then two slip rings 8 can extrude the tight bag 7 of ring clamp, and make it carry out the bulging deformation, then the inner ring through the tight bag 7 of two ring clamp carries out the centre gripping to two blast pipes 20 fixed, thereby conveniently splice two blast pipes 20 fast, and the screw thread need not be seted up to the outer wall of two blast pipes 20, the process has been reduced, thereby work efficiency is improved, and two tight bags 7 of ring clamp can also play certain sealed effect between two blast pipes 20 and the steel bushing 1 after the inflation.

Further, two grooves have been seted up to steel bushing 1 inner wall that is located between two solid fixed rings 6, and two inslot all install sealing washer 9, the toroidal cavity has been seted up to the inside of sealing washer 9, the inner ring outer wall of two sealing washers 9 contacts with the outer wall of two blast pipes 20 respectively, the outer wall of two sealing washers 9 all communicates communicating pipe 10, two one ends of keeping away from sealing washer 9 communicating pipe 10 are fixed respectively at two ring-type clamping bag 7 outer walls, and communicate with the inner chamber of two ring-type clamping bags 7.

When the two annular clamping bags 7 are squeezed, air in the annular clamping bags 7 is squeezed into the sealing ring 9 through the communicating pipe 10, the sealing ring 9 can expand to clamp the exhaust pipes 20 and seal the space between the two exhaust pipes 20, and the sealing effect is achieved.

Further, drive assembly includes two hollow tubes 13 that can move relatively or back to back mutually, two hollow tubes 13 respectively slidable mounting are at the steel bushing 1 inner wall at two slip ring 8 looks backs, the equal slidable mounting of inner wall of two hollow tubes 13 has piston ring 12, two outer walls that piston ring 12 is close to slip ring 8 all are fixed with ejector pin 11, the through-hole has all been seted up to the outer wall of two hollow tube 13 opposite faces, the one end that two ejector pins 11 worn out two through-holes is fixed respectively at the outer wall of two slip rings 8, two outer walls that piston ring 12 is close to slip ring 8 are fixed with memory alloy 18 with the inner wall of two hollow tubes 13 respectively, memory alloy 18 can shorten along with the temperature reduction.

When the two hollow pipes 13 are driven to move relatively through an external structure, at the moment, due to the connection effect of the memory alloy 18 on the piston ring 12 and the hollow pipes 13, the hollow pipes 13 can drive the piston ring 12 and the ejector rods 11 to move together when moving, then the ejector rods 11 can push the sliding ring 8 to move towards the direction close to the fixing ring 6, and the annular clamping bag 7 is extruded, so that the exhaust pipe 20 is fixed once.

Then when the refrigeration equipment is used for refrigeration, the temperature in the exhaust pipe is reduced, and because most of the exhaust pipes are steel pipes, the heat transfer effect is obvious, so that the memory alloy 18 is shortened when sensing the temperature reduction, then the memory alloy 18 pulls the piston ring 12 to move towards the sliding ring 8 continuously, at the same time, the ejector rod 11 continuously pushes the sliding ring 8 to move towards the fixing ring 6, the annular clamping bag 7 is extruded again, the annular clamping bag 7 is further deformed to clamp and fix the exhaust pipe 20, meanwhile, the sealing ring 9 is filled with gas again, so that the sealing ring 9 is always kept in an expanded state, the sealing performance is further improved, because the air in the sealing ring 9 and the air in the annular clamping bag 7 are contracted under the action of thermal expansion and cold contraction, therefore, the sealing effect of the sealing ring 9 and the fixing effect of the annular clamping bag 7 can be prevented from being influenced by squeezing the annular clamping bag 7 again and continuously filling air into the sealing ring 9, and because sealing washer 9 will shrink, so the inner circle of sealing washer 9 will dwindle to make it have a packing power to the outer wall of blast pipe 20, then fill gas into sealing washer 9 again, and then make sealing washer 9 when increasing sealed effect, can also play fixed effect to blast pipe 20 further.

And after the refrigeration equipment stops using, the temperature of the exhaust pipe 20 can be gradually restored to the room temperature, at the moment, the memory alloy 18 can be elongated and restored to the original state, the annular clamping bag 7 and the sealing ring 9 can be prevented from being broken by expansion and contraction of air, and therefore the effect of dynamically adjusting the clamping and sealing performance is achieved.

Further, the outer wall at the back of two piston rings 12 all is fixed with connecting rod 14, and the through-hole that can supply connecting rod 14 to wear out is all seted up to the outer wall at the back of two hollow tubes 13 mutually, and the one end that two connecting rods 14 worn out all is fixed with spacing ring 5, and the outer wall of two spacing rings 5 all is provided with clamping mechanism.

Meanwhile, when the piston ring 12 moves towards the sliding ring 8, the connecting rod 14 is driven to move together, then the connecting rod 14 drives the limiting ring 5 to move together, and then the exhaust pipe 20 is clamped and fixed again through the clamping mechanism.

Clamping mechanism includes that two at least logical grooves of seting up at the 5 outer walls of spacing ring, and logical inslot slidable mounting respectively has kicking block 15 and briquetting 16, and briquetting 16 contacts with the outer wall of blast pipe 20, is connected with spring 17 between kicking block 15 and the briquetting 16, and wedge groove 19 has all been seted up to the inner wall at steel bushing 1 both ends, and the inclined plane with wedge groove 19 looks adaptation is seted up at the top of kicking block 15.

When the connecting rod 14 drives the limiting ring 5 to move towards the middle of the steel sleeve 1 together, the inclined surface of the top block 15 is attached to the wedge groove 19, and the pressing block 16 is attached to the outer wall of the exhaust pipe 20 through the elastic force of the spring 17, so that the exhaust pipe 20 is further fixed and positioned.

Further, the spout has all been seted up to the outer wall that steel bushing 1 is close to two hollow tubes 13, and equal slidable mounting has screw thread block 3 in two spouts, the outer wall at two hollow tubes 13 is fixed respectively to the one end of two screw thread blocks 3, the outer wall at steel bushing 1 both ends all is fixed with axle bed 4, two-way screw rod 2 is installed in the axle center common rotation of two axle beds 4, two-way screw rod 2 runs through two screw thread blocks 3, and respectively with the department threaded connection that runs through of two screw thread blocks 3, can drive two screw thread blocks 3 and do relative or back on the back when two-way screw rod 2 rotates and move.

By rotating the two-way screw 2, the two-way screw 2 drives the two thread blocks 3 to move relatively and drives the two connected hollow pipes 13 to move relatively.

As shown in fig. 2, two sets of the screw block 3 and the two-way screw 2 can be arranged, so that the hollow pipe 13 can be stressed more uniformly and is more convenient to move.

Furthermore, a handle is fixed at one end of the bidirectional screw 2 penetrating out of one of the shaft seats 4, and the bidirectional screw 2 can be conveniently rotated through the handle.

Further, the inner ring outer walls of the two annular clamping bags 7 are both provided with frosted surfaces, and the friction force between the inner ring of the annular clamping bag 7 and the exhaust pipe 20 can be improved by the frosted surfaces, so that the annular clamping bags can be prevented from slipping.

Further, the contact surface of the pressing block 16 and the exhaust pipe 20 is set to be a frosted surface, the friction force between the pressing block 16 and the exhaust pipe 20 can be improved by setting the outer wall of the pressing block 16 to be the frosted surface, the anti-slip effect is further achieved, and the exhaust pipe 20 is connected more stably.

The working principle is as follows: when the steel bushing for the exhaust pipe of the low-temperature refrigeration equipment is used, the two exhaust pipes 20 are inserted from two ends of the steel bushing 1 and abut against each other, then the two-way screw 2 is rotated, the two-way screw 2 can drive the two thread blocks 3 to move relatively and drive the two connected hollow pipes 13 to move relatively, at the moment, due to the connection effect of the memory alloy 18 on the piston ring 12 and the hollow pipes 13, the hollow pipes 13 can drive the piston ring 12 and the ejector rods 11 to move together when moving, then the ejector rods 11 can push against the sliding ring 8 to move towards the direction close to the fixing ring 6 and extrude the annular clamping bag 7, so that air in the annular clamping bag 7 is extruded into the sealing ring 9 through the communicating pipe 10, the sealing ring 9 can expand to clamp the exhaust pipes 20 and seal the two exhaust pipes 20, the sealing effect is achieved, then the outer wall of the inner ring of the annular clamping bag 7 can expand and deform to extrude and fix the exhaust pipes 20 as the annular clamping bag 7 continues to be extruded, the effect of sealing the exhaust pipe 20 while clamping and fixing the exhaust pipe fast is achieved.

Meanwhile, when the piston ring 12 moves towards the sliding ring 8, the connecting rod 14 can be driven to move together, then the connecting rod 14 can drive the limiting ring 5 to move together, the inclined surface of the ejector block 15 is attached to the wedge groove 19, at the moment, the pressing block 16 is attached to the outer wall of the exhaust pipe 20 through the elastic force of the spring 17, and the exhaust pipe 20 is further fixed and positioned.

Then when the refrigeration equipment is used for refrigeration, the temperature in the exhaust pipe is reduced, and most of the exhaust pipes are steel pipes, so that the heat transfer effect is obvious, when the memory alloy 18 senses the temperature reduction, the temperature is shortened, then the memory alloy 18 pulls the piston ring 12 to move towards the sliding ring 8 continuously, at the same time, the ejector rod 11 continuously pushes the sliding ring 8 to move towards the fixing ring 6, the annular clamping bag 7 is extruded again, the annular clamping bag 7 is further deformed to clamp and fix the exhaust pipe 20, meanwhile, the sealing ring 9 is inflated again, the sealing ring 9 is kept in an expanded state all the time, the sealing performance is further improved, because under the action of thermal expansion and cold contraction, the air in the sealing ring 9 and the air in the annular clamping bag 7 are contracted, the volumes of the annular clamping bag 7 and the sealing ring 9 are reduced, and therefore, the sealing effect of the sealing ring 9 and the sealing ring 9 can be prevented from being influenced by squeezing the annular clamping bag 7 again and inflating the sealing ring 9 continuously The fixing effect of the form-clamping capsule 7.

And when piston ring 12 removed once more can drive spacing ring 5 removal once more through connecting rod 14, under the mating reaction of the inclined plane of kicking block 15 and wedge groove 19, kicking block 15 can extrude spring 17 once more, can make briquetting 16 inseparabler laminating at the outer wall of blast pipe 20, has further improved the effect of pressing from both sides tightly and fixing.

The standard parts used in the present embodiment may be purchased directly from the market, and the non-standard structural components described in the specification and drawings may be obtained by processing without any doubt according to the common general knowledge in the art, and the connection manner of the respective parts is by the conventional means developed in the art, and the machines, parts and equipment are of the conventional type in the art, so that the detailed description thereof is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A steel sleeve for an exhaust pipe of a low-temperature refrigeration equipment, comprising a steel sleeve (1) for connecting two exhaust pipes (20), characterized in that: the inner wall of the steel sleeve (1) is fixed with two A fixing ring (6), two sliding rings (8) are slidably mounted on the inner wall of the steel sleeve (1), and the two sliding rings (8) are respectively located on the opposite side of the two fixing rings (6) , an annular clamping bag (7) is installed on the outer walls of the two fixed rings (6) on the opposite sides and the outer walls on the opposite sides of the two sliding rings (8), respectively, and the two exhaust pipes (20) are made from steel The two ends of the sleeve (1) are inserted and pressed against each other;

Also includes a drive assembly for driving the two sliding rings (8) to move relative or opposite;

Two grooves are opened on the inner wall of the steel sleeve (1) between the two fixing rings (6), and sealing rings (9) are installed in the two grooves, and the sealing rings (9) are provided with An annular cavity, the outer walls of the inner rings of the two sealing rings (9) are respectively in contact with the outer walls of the two exhaust pipes (20), and the outer walls of the two sealing rings (9) are connected with a communication pipe (10). ), the ends of the two communicating tubes (10) away from the sealing ring (9) are respectively fixed on the outer walls of the two annular clamping sacs (7), and communicate with the inner cavities of the two annular clamping sacs (7);

The drive assembly includes two hollow tubes (13) that can move relative to each other or opposite to each other, and the two hollow tubes (13) are respectively slidably installed on the steel sleeves (1) on the opposite sides of the two sliding rings (8). Inner walls, piston rings (12) are slidably installed on the inner walls of the two hollow tubes (13), and ejector rods (11) are fixed on the outer walls of the two piston rings (12) close to the sliding ring (8). The outer walls of the opposite surfaces of each of the hollow tubes (13) are provided with through holes, and the ends of the two push rods (11) passing through the two through holes are respectively fixed on the outer walls of the two sliding rings (8). A memory alloy (18) is fixed to the outer wall of the piston ring (12) close to the sliding ring (8) and the inner wall of the two hollow tubes (13) respectively, and the memory alloy (18) will shorten as the temperature decreases.

2. The steel sleeve for the exhaust pipe of the cryogenic refrigeration equipment according to claim 1, characterized in that: connecting rods (14) are fixed on the outer walls on the opposite sides of the two piston rings (12), and the two hollow The outer walls of the opposite sides of the pipe (13) are provided with through holes through which the connecting rods (14) can pass through, and the two connecting rods (14) are both fixed at one end through which a limiting ring (5) is inserted. The outer wall of the limit ring (5) is provided with a clamping mechanism;

The clamping mechanism includes at least two through grooves opened on the outer wall of the limit ring (5), and a top block (15) and a pressure block (16) are slidably installed in the through grooves, and the pressure block (16) In contact with the outer wall of the exhaust pipe (20), a spring (17) is connected between the top block (15) and the pressing block (16), and the inner walls of both ends of the steel sleeve (1) are provided with wedge grooves ( 19), the top of the top block (15) is provided with an inclined surface adapted to the wedge groove (19).

3. The steel sleeve for the exhaust pipe of the low-temperature refrigeration equipment according to claim 1, characterized in that: the outer walls of the steel sleeve (1) close to the two hollow pipes (13) are provided with sliding grooves, and the two sliding grooves are Threaded blocks (3) are slidably installed in the grooves, one ends of the two threaded blocks (3) are respectively fixed on the outer walls of the two hollow tubes (13), and shafts are fixed on the outer walls of both ends of the steel sleeve (1). A seat (4), the shaft centers of the two shaft seats (4) are jointly rotated and installed with a bidirectional screw (2), the bidirectional screw (2) penetrates through the two threaded blocks (3), and is respectively connected with the two threaded blocks. The penetrating part of (3) is threaded, and when the two-way screw (2) rotates, it will drive the two threaded blocks (3) to move relative or opposite.

4 . The steel sleeve for the exhaust pipe of the cryogenic refrigeration equipment according to claim 3 , wherein a handle is fixed at one end of the bidirectional screw ( 2 ) passing through one of the shaft seats ( 4 ). 5 .

5 . The steel sleeve for the exhaust pipe of the cryogenic refrigeration equipment according to claim 1 , wherein the inner and outer walls of the two annular clamping pockets ( 7 ) are both set as frosted surfaces. 6 .

6 . The steel sleeve for the exhaust pipe of the cryogenic refrigeration equipment according to claim 2 , wherein the contact surface between the pressing block ( 16 ) and the exhaust pipe ( 20 ) is set as a frosted surface. 7 .