CN114183354B

CN114183354B - Screw type refrigerating machine for ultralow temperature refrigeration

Info

Publication number: CN114183354B
Application number: CN202210140856.3A
Authority: CN
Inventors: 邓永煌
Original assignee: Shenzhen Ruixue Refrigeration Equipment Co ltd
Current assignee: Shenzhen Ruixue Refrigeration Equipment Co ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-13
Anticipated expiration: 2042-02-16
Also published as: CN114183354A

Abstract

The invention discloses a screw type refrigerator for ultralow temperature refrigeration, which comprises a compressor body, wherein a male rotor and a female rotor are arranged in a cylinder of the compressor body, the screw type refrigerator also comprises a slide valve for adjusting the internal volume ratio, the slide valve comprises an insertion part arranged in a slide valve cavity of the compressor body and an exposed part extending out of the compressor body, and an exhaust port is formed in the side wall of one end of the insertion part; a sliding cavity is formed in the sliding valve, a plurality of bypass holes communicated with the inside of the compressor body cylinder are formed in the outer wall of the inserting portion, and an adjusting assembly is arranged in the sliding cavity. According to the invention, the adjusting assembly is arranged, the number of the bypass holes opened or closed is adjusted by moving the adjusting assembly, so that the effect of adjusting the internal volume is achieved, and the sliding valve does not need to move during adjustment, so that the sliding valve can be prevented from being abraded due to friction between the sliding valve and the male and female rotors during movement, the frequency of maintenance is reduced, and the service life is prolonged.

Description

Screw type refrigerating machine for ultralow temperature refrigeration

Technical Field

The invention relates to the technical field of screw rod refrigerating machines, in particular to a screw rod refrigerating machine for ultralow temperature refrigeration.

Background

The screw compressor is a component in a refrigerating unit, the screw compressor completes the processes of air suction, compression and discharge by utilizing the mutual meshing of tooth space volumes of a pair of screws and rotors to cause the volume change consisting of tooth-shaped spaces, one end of a male rotor and the other end of the male rotor and the female rotor is a suction end, air is sucked from the suction end along with the rotation of the male rotor and the female rotor, the air is discharged from the discharge end after being compressed, and then the aim of refrigeration is achieved through the physical change of the air.

The operating frequency and the internal volume ratio are two important operating parameters of a screw compressor. The suction capacity can be adjusted by changing the working frequency of the screw compressor, and the higher the working frequency is, the faster the rotating speeds of the male and female rotors are, the larger the suction capacity is. At present, the capacity adjustment of the screw compressor is usually completed by utilizing an adjusting slide valve, the slide valve is arranged in a slide valve cavity of a screw compressor body and is positioned at the intersection point of a male rotor and a female rotor, and the slide valve can slide back and forth along the axial direction of the compressor body and can be separated from a body of the compressor along with the movement of the slide valve, so that air can bypass through an opening, and the purpose of adjusting the inner volume is achieved.

And helical-lobe compressor is in order to guarantee good compression effect, therefore the interval between negative and positive rotor and the sliding valve can be very little to guarantee air compression's effect, and the air can produce the heat when compressing, makes its temperature rise, thereby makes the inner structure inflation, like this the sliding valve at the in-process that reciprocal slip was adjusted, can and negative rotor between take place the risk of scraping, under long-time the use, can cause the wearing and tearing of sliding valve and negative and positive rotor, thereby reduce its efficiency and life.

Disclosure of Invention

The invention aims to provide a screw type refrigerator for ultralow temperature refrigeration, which adjusts the number of opened or closed bypass holes by moving an adjusting component so as to achieve the effect of adjusting the internal volume, and a slide valve does not need to move during adjustment, so that the slide valve can be prevented from being abraded due to friction between the slide valve and a male rotor and a female rotor during movement, the frequency of maintenance and repair is reduced, the service life is prolonged, and the problems in the background technology are solved.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a screw refrigerator for ultra-low temperature refrigeration, includes the compressor body, the inside negative and positive rotor that is provided with of compressor body jar still includes the slide valve that is used for adjusting the interior volume ratio, the slide valve is including installing the portion of exposing outside the portion of installing in compressor body slide valve intracavity and stretching out the compressor body, the gas vent has been seted up to the one end lateral wall of portion of inserting.

The sliding cavity is formed in the sliding valve, a plurality of bypass holes communicated with the inside of the compressor body cylinder are formed in the outer wall of the inserting portion, an adjusting assembly is arranged inside the sliding cavity, the bypass holes can be closed when the adjusting assembly moves towards the direction close to the exhaust port, all the bypass holes are closed after the adjusting assembly moves to the limit position, the bypass holes can be opened when the adjusting assembly moves towards the direction far away from the exhaust port, and all the bypass holes are opened after the adjusting assembly moves to the limit position.

Preferably, the adjusting assembly comprises a first sliding part which is installed on the inner wall of the sliding cavity in a sliding manner, the first sliding part is located on one side close to the bypass hole, a plurality of installation holes are formed in the first sliding part, a sealing block is vertically and slidably installed in each installation hole, the adjusting assembly further comprises a driving assembly which can enable the sealing block to extend out of or retract into the installation holes, and a plurality of spare holes for inserting the sealing blocks are formed in the inner wall of the exposed part.

Preferably, the drive assembly includes a second sliding part installed on the inner wall of the sliding cavity in a slidable manner, a sliding groove is formed in the inner wall of the installation hole, a sliding block is fixed on the outer wall of the closed block close to the sliding groove and is connected with the inner wall of the sliding groove in a sliding manner, a spring is connected between the outer wall of the sliding groove close to the bypass hole and the inner wall of the sliding groove, a round corner is formed in the bottom of the closed block, and a round corner is formed in one end, located in the sliding cavity, of the second sliding part.

Preferably, the driving assembly comprises a third sliding part slidably mounted on the inner wall of the sliding cavity, the outer wall of the third sliding part, which is close to the first sliding part, is rotatably connected with a plurality of connecting rods, and one end of each connecting rod, which is far away from the third sliding part, is correspondingly and rotatably connected to the bottom of each closing block.

Preferably, a stop block for limiting the driving assembly is fixed at the end of the first sliding part located in the sliding cavity.

Preferably, when the closing block is inserted into the bypass hole after extending out of the mounting hole, the closing block is flush with the plane of the insertion portion.

Preferably, the aperture of the bypass hole is gradually reduced from one side close to the sliding cavity to the outer wall of the insertion part, and the top of the sealing block is in a frustum shape corresponding to the top of the sealing block.

Preferably, the exposed portion has an outer diameter larger than an outer diameter of the insertion portion, and the exposed portion and the insertion portion have equal lengths.

Preferably, the number of the bypass holes is the same as the number of the spare holes.

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

firstly, the adjusting assembly is arranged, when the inner volume is adjusted, the adjusting assembly moves to adjust the number of the bypass holes which are opened or closed, so that the effect of adjusting the inner volume is achieved, and the sliding valve does not need to move during adjustment, so that the sliding valve can be prevented from being abraded due to friction with the male and female rotors during movement, the frequency of maintenance is reduced, the service life is prolonged, meanwhile, the distance between the male and female rotors and the sliding valve can be set to be small, the effect of air compression is ensured, when ultralow temperature refrigeration is carried out, the air compression quality can be higher, and the subsequent refrigeration effect can be further kept or improved.

The invention adjusts the inner volume by the closed number of the bypass holes, and when the inside of the bypass holes is hollow, when part of compressed air passes above the bypass holes, the bypass holes can generate buzzing or whering sound, thereby causing certain noise.

Drawings

FIG. 1 is a schematic structural view of a partial mechanism of a compressor body according to the present invention;

FIG. 2 is a schematic view of the present invention in elevation, partially in section;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic view of a partially enlarged perspective view of the spool valve of the present invention;

FIG. 5 is a schematic cross-sectional view illustrating a structure of the insert part in which bypass holes are completely closed according to the present invention;

FIG. 6 is a schematic cross-sectional view illustrating a partially closed bypass hole of the insertion part according to the present invention;

FIG. 7 is a schematic view illustrating a cross-sectional structure in which a bypass hole of an insertion part of the present invention is fully opened;

FIG. 8 is a schematic structural view of a cross-sectional view of the present invention in an adjusted state;

FIG. 9 is an enlarged view of FIG. 5 at B;

fig. 10 is a schematic cross-sectional view of a driving assembly according to an embodiment of the present invention.

In the figure: 1. a compressor body; 2. a spool valve; 3. an exposed portion; 4. an insertion portion; 5. a second slider; 6. a first slider; 7. an exhaust port; 8. a sealing block; 9. a spare hole; 10. a sliding cavity; 11. a bypass orifice; 12. a chute; 13. a slider; 14. a spring; 15. a stopper; 16. mounting holes; 17. a connecting rod; 18. a third slider; 19. male and female rotors.

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 10, the present invention provides a technical solution: the utility model provides a screw refrigerator for cryogenic refrigeration, includes

compressor body

1, and 1 jar inside of compressor body is provided with negative and positive rotor 19, still includes the slide valve 2 that is used for adjusting the internal volume ratio, and slide valve 2 is including installing the portion of exposing 3 outside the portion of inserting 4 in 1 slide valve intracavity of compressor body and stretching out compressor body 1, and gas vent 7 has been seted up to the one end lateral wall of portion of inserting 4.

The inside of slide valve 2 has been seted up and has been slided chamber 10, the outer wall of insert portion 4 has been seted up a plurality of by-pass holes 11 with the inside intercommunication of compressor body 1 jar, the internally mounted of slide chamber 10 has adjusting part, can close by-pass hole 11 when adjusting part moves to the direction that is close to gas vent 7, after moving extreme position, all by-pass holes 11 close, can open by-pass hole 11 when adjusting part moves to the direction of keeping away from gas vent 7, after moving extreme position, all by-pass holes 11 open.

When the compressor body 1 works, the male and female rotors 19 can be rotated through an external mechanism, the mutual meshing between tooth space volumes is utilized, the volume change formed by tooth space is caused to enable air to be sucked from the air suction port of the compressor body 1, then the air is compressed through the reduction of the tooth space volume, the compressed air is discharged from the air discharge port 7 to the air discharge port of the compressor body 1 to be discharged, the whole compression process of the air is completed, then the refrigeration purpose is achieved through the physical change of the air, and the existing working procedure can be specifically referred.

When the working efficiency of the compressor body 1 is adjusted, the efficiency of air compression can be adjusted by adjusting the rotating speed of the male and female rotors 19, and the sealing degree of the bypass holes 11 can be adjusted by the adjusting assembly, so that the efficiency of air compression is adjusted.

Referring to fig. 5, the adjusting assembly is driven by an external structure to slide along the sliding cavity 10 inside the sliding valve 2 to close and open the bypass holes 11, the adjusting assembly closes the bypass holes 11 when moving in a direction close to the exhaust port 7, and after moving to a limit position, all the bypass holes 11 are closed, and at this time, the effective compression volume of the compressor body 1 is at a maximum state.

Referring to fig. 6, the adjusting assembly is moved by an external mechanism to open a portion of the bypass holes 11, thereby adjusting the effective compression volume of the compressor body 1 to control the power thereof.

Referring to fig. 7, when the adjusting assembly is driven by the external structure to move in a direction away from the exhaust port 7, and moves to the limit position, all the bypass holes 11 are opened, and at this time, the effective compression volume of the compressor body 1 is at a minimum state.

In conclusion, move through the adjusting part, adjust the quantity of opening or closing by-pass hole 11, with this effect that reaches the regulation inner volume, do not need slide valve 2 to remove during the regulation, thereby can avoid slide valve 2 to take place the friction and cause wearing and tearing with negative and positive rotor 19 when removing, and then reduced its frequency of maintenance and maintenance, life has been improved, the interval between negative and positive rotor and the slide valve can set up very little simultaneously, in order to guarantee air compression's effect, when carrying out ultra-low temperature refrigeration, can make air compression quality higher, further can keep or improve subsequent refrigeration effect.

Further, the adjusting assembly comprises a first sliding part 6 which is installed on the inner wall of the sliding cavity 10 in a sliding manner, the first sliding part 6 is located on one side close to the bypass hole 11, a plurality of installation holes 16 are formed in the first sliding part 6, a sealing block 8 is vertically and slidably installed in each installation hole 16, the adjusting assembly further comprises a driving assembly which enables the sealing block 8 to extend out of or retract into the installation holes 16, and a plurality of standby holes 9 for inserting the sealing block 8 are formed in the inner wall of the exposed part 3.

The first sliding part 6 is driven to move through an external mechanism, the position of the first sliding part 6 is adjusted, the sealing block 8 on the first sliding part is aligned with the bypass hole 11, then the sealing block 8 extends out of the mounting hole 16 and is inserted into the bypass hole 11 through the driving assembly to be sealed, the rest sealing blocks 8 can be inserted into the spare holes 9 in the exposed part 3, and the sealing block 8 can play a limiting role in the first sliding part 6 when being inserted into the bypass hole 11, so that the bypass hole 11 is sealed.

If the bypass hole 11 is only closed and the inside is hollow, when a part of compressed air passes above the bypass hole 11, the bypass hole 11 will generate buzzing or wheezing sound to cause certain noise, and the bypass hole 11 can be filled while the air is closed by the closing block 8, so that the purpose of adjustment is achieved, and the noise can be avoided.

Further, drive assembly is including installing at sliding chamber 10 inner wall slidable second slider 5, spout 12 has been seted up to the inner wall of mounting hole 16, the outer wall that closing block 8 is close to spout 12 is fixed with slider 13, and slider 13 and spout 12's inner wall sliding connection, be connected with spring 14 between spout 12 is close to the outer wall of by-pass hole 11 and the inner wall of spout 12, the fillet has been seted up to closing block 8's bottom, the fillet has been seted up to the one end that second slider 5 is located sliding chamber 10.

The following is an embodiment one of the driving assembly, after the position of the first sliding member 6 is adjusted, at this time, the second sliding member 5 is driven by the external mechanism to slide into the sliding cavity 10, then the round corner at the end of the second sliding member 5 contacts the round corner part at the bottom of the sealing block 8, and then the sealing block 8 is jacked up, so that the sealing block 8 extends into the corresponding bypass hole 11 to seal the bypass hole.

When the adjustment needs to be carried out again, the second sliding part 5 can be driven by an external mechanism to slide towards the outside of the sliding cavity 10, and after the second sliding part is separated from the sealing block 8, the second sliding part can push the sliding block 13 to move along the inner wall of the sliding groove 12 under the action of the elastic force of the spring 14, so that the sealing block 8 moves towards the mounting hole 16, the resetting is completed, meanwhile, the first sliding part 6 is unlocked, the second sliding part can be moved and adjusted again, and then the steps are repeated to adjust.

Further, the driving assembly comprises a third sliding part 18 slidably mounted on the inner wall of the sliding cavity 10, a plurality of connecting rods 17 are rotatably connected to the outer wall of the third sliding part 18 close to the first sliding part 6, and one end of each connecting rod 17 far away from the third sliding part 18 is respectively and correspondingly rotatably connected to the bottom of each closing block 8.

Referring to fig. 10, after the first sliding member 6 is moved and adjusted into the sliding cavity 10, the third sliding member 18 is driven by an external mechanism to move into the sliding cavity 10, and then the third sliding member slides against the sealing block 8 under the connecting action of the connecting rod 17, and extends out of the mounting hole 16 to be inserted into the bypass hole 11 to seal the sealing block, and after the sealing block 8 is inserted into the bypass hole 11, the connecting rod 17 is in a vertical state, so that the air pressure received by the sealing block 8 and the supporting force of the connecting rod 17 on the sealing block can be kept in the same straight line, and the sealing block 8 can be prevented from retracting due to the air pressure.

On the contrary, when the adjustment needs to be performed again, the third sliding part 18 is driven by the external structure to slide towards the outside of the sliding cavity 10, then the closing block 8 is separated from the bypass hole 11 under the connecting action of the connecting rod 17, and then the adjustment is performed again.

Further, a stopper 15 for limiting the driving assembly is fixed to the end of the first slider 6 inside the sliding cavity 10.

Can carry on spacingly to drive assembly through dog 15, when second slider 5 moved to contact dog 15, accomplish ejecting to closed piece 8, and when third slider 18 contacted dog 15, connecting rod 17 was in vertical state this moment, had played limiting displacement, conveniently adjusted.

Further, when the closing block 8 is protruded from the mounting hole 16 and inserted into the bypass hole 11, the closing block 8 is flush with the plane of the insertion portion 4.

When the closing block 8 is inserted into the bypass hole 11 to be closed, the closing block 8 is flush with the insertion portion 4, referring to fig. 4, so that the male and female rotors 19 are prevented from being worn due to contact with the edges of the bypass hole 11.

Further, the aperture of the bypass hole 11 is gradually reduced from the side close to the sliding chamber 10 to the outer wall of the insertion portion 4, and the top of the sealing block 8 is set to be frustum-shaped corresponding to the inner diameter.

The by-pass hole 11 sets up to the hole of similar taper shape, and the top of closing block 8 sets up to the frustum form, can make closing block 8 can not take place the friction when inserting by-pass hole 11 like this, when closing block 8 inserts by-pass hole 11 completely and rather than the inner wall contact, just can seal by-pass hole 11, and the regulation of closing block 8 at every turn can not have too much wearing and tearing with by-pass hole 11 like this, avoids wearing and tearing seriously and leading to its gas tightness problem to appear after long-time the use.

Further, the outer diameter of the exposed portion 3 is larger than the outer diameter of the insertion portion 4, and the lengths of the exposed portion 3 and the insertion portion 4 are equal.

The exposed part 3 is arranged to have a large outer diameter, so that the depth of the spare hole 9 is the same as that of the bypass hole 11, and the spare hole 9 does not penetrate through the exposed part 3, thereby avoiding the hidden trouble of air leakage of the spare hole 9.

Further, the number of holes of the bypass hole 11 is the same as the number of holes of the spare hole 9.

The number of the bypass holes 11 and the spare holes 9 is the same, and referring to fig. 7 and 5, the bypass holes 11 may be fully opened or fully closed.

The working principle is as follows: this a screw refrigerator for ultra-low temperature is cryogenic when using, move through the first slider 6 of external mechanism drive, adjust the position of first slider 6, and make the closing block 8 and the by pass hole 11 on it align, then the rethread external mechanism drives second slider 5 and slides to sliding chamber 10, then the fillet of 5 tip of second slider can contact the fillet part of closing block 8 bottom, then 8 jack-ups of closing block, thereby make closing block 8 stretch into in the by pass hole 11 that corresponds, seal it, and closing block 8 seals by pass hole 11 back, the top of closing block 8 and the plane parallel and level of inserting portion 4.

When the inner volume is adjusted, the second sliding part 5 is reversely driven by an external mechanism to move to the outside of the sliding cavity 10, and after the second sliding part is separated from the sealing block 8, the second sliding part pushes against the sliding block 13 to move along the inner wall of the sliding groove 12 under the action of the elastic force of the spring 14, so that the sealing block 8 is moved into the mounting hole 16, the resetting is completed, meanwhile, the first sliding part 6 is also unlocked, the second sliding part can be moved and adjusted again, and then the steps are repeated to adjust.

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. The utility model provides a screw refrigerator for cryogenic refrigeration, includes compressor body (1), compressor body (1) jar inside is provided with negative and positive rotor (19), its characterized in that: the compressor is characterized by further comprising a slide valve (2) used for adjusting the internal volume ratio, wherein the slide valve (2) comprises an insertion part (4) installed in a slide valve cavity of the compressor body (1) and an exposed part (3) extending out of the compressor body (1), and an exhaust port (7) is formed in the side wall of one end of the insertion part (4);

a sliding cavity (10) is formed in the sliding valve (2), a plurality of bypass holes (11) communicated with the interior of a cylinder of the compressor body (1) are formed in the outer wall of the insertion part (4), an adjusting assembly is mounted in the sliding cavity (10), when the adjusting assembly moves towards a direction close to the exhaust port (7), the bypass holes (11) are closed, after the adjusting assembly moves to a limit position, all the bypass holes (11) are closed, when the adjusting assembly moves towards a direction far away from the exhaust port (7), the bypass holes (11) are opened, and after the adjusting assembly moves to the limit position, all the bypass holes (11) are opened;

the adjusting part comprises a first sliding part (6) installed on the inner wall of a sliding cavity (10) in a sliding mode, the first sliding part (6) is located on one side close to a bypass hole (11), a plurality of installation holes (16) are formed in the first sliding part (6), a sealing block (8) is installed in each installation hole (16) in a vertical sliding mode, the adjusting part further comprises a driving component capable of enabling the sealing block (8) to stretch out or retract in the installation holes (16), and a plurality of spare holes (9) for inserting the sealing block (8) are formed in the inner wall of an exposed portion (3).

2. The screw refrigerator for ultra-low temperature refrigeration of claim 1, wherein: drive assembly is including installing at sliding chamber (10) inner wall slidable second slider (5), spout (12) have been seted up to the inner wall of mounting hole (16), the outer wall that closing block (8) are close to spout (12) is fixed with slider (13), just the inner wall sliding connection of slider (13) and spout (12), be connected with spring (14) between the outer wall that spout (12) are close to bypass hole (11) and the inner wall of spout (12), the fillet has been seted up to the bottom of closing block (8), the fillet has been seted up to the one end that second slider (5) are located sliding chamber (10).

3. The screw refrigerator for ultra-low temperature refrigeration of claim 1, wherein: the driving assembly comprises a third sliding piece (18) which is slidably mounted on the inner wall of the sliding cavity (10), the outer wall, close to the first sliding piece (6), of the third sliding piece (18) is rotatably connected with a plurality of connecting rods (17), and one end, far away from the third sliding piece (18), of each connecting rod (17) is correspondingly rotatably connected to the bottom of each sealing block (8) respectively.

4. The screw refrigerator for ultra-low temperature refrigeration according to claim 2 or 3, wherein: and a stop block (15) for limiting the driving assembly is fixed at the tail end of the first sliding part (6) positioned in the sliding cavity (10).

5. A screw refrigerator for ultra-low temperature refrigeration according to any one of claims 1 to 3, wherein: when the sealing block (8) extends out of the mounting hole (16) and is inserted into the bypass hole (11), the sealing block (8) is flush with the plane of the insertion part (4).

6. A screw refrigerator for ultra-low temperature refrigeration according to any one of claims 1 to 3, wherein: the aperture of the bypass hole (11) is gradually reduced from one side close to the sliding cavity (10) to the outer wall of the insertion part (4), and the top of the sealing block (8) is in a frustum shape corresponding to the top of the sealing block.

7. The screw refrigerator for ultra-low temperature refrigeration of claim 1, wherein: the outer diameter of the exposed part (3) is larger than that of the insertion part (4), and the lengths of the exposed part (3) and the insertion part (4) are equal.

8. The screw refrigerator for ultra-low temperature refrigeration of claim 1, wherein: the number of the bypass holes (11) is the same as that of the spare holes (9).