CN114688024A - Screw compressor - Google Patents
Screw compressor Download PDFInfo
- Publication number
- CN114688024A CN114688024A CN202210221925.3A CN202210221925A CN114688024A CN 114688024 A CN114688024 A CN 114688024A CN 202210221925 A CN202210221925 A CN 202210221925A CN 114688024 A CN114688024 A CN 114688024A
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- pressure
- section
- pressure relief
- rotors
- screw compressor
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- 238000007906 compression Methods 0.000 claims abstract description 65
- 230000006835 compression Effects 0.000 claims abstract description 62
- 230000001105 regulatory effect Effects 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 10
- 230000029058 respiratory gaseous exchange Effects 0.000 claims 1
- 230000013011 mating Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
- F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/18—Pressure
- F04C2270/185—Controlled or regulated
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The present application provides a screw compressor comprising: a housing, a pair of rotors, a pressure relief passage and an adjustment device; the housing is provided with a rotor cavity, the pair of rotors are positioned in the rotor cavity, a compression cavity can be formed between the teeth of the pair of rotors and the housing, the pair of rotors are provided with a suction end and a discharge end, and the discharge end is provided with a discharge end surface extending along the radial direction; the pressure relief passage having a pressure relief passage inlet communicable with the compression pocket and a pressure relief passage outlet communicable with the discharge side of the compressor; the regulating device is movably mounted on the housing and is configured to controllably open or close an inlet of a pressure relief passage to enable the compression volume to be communicated with or disconnected from the pressure relief passage. The compressor in this application can adjust the gas pressure in the compression holds the chamber.
Description
Technical Field
The present application relates to a compressor, and more particularly, to a screw compressor having a pressure regulating device.
Background
Screw compressors are common components in refrigeration units. The screw compressor completes the processes of gas suction, compression and discharge by utilizing the mutual meshing of the tooth space volumes of a pair of screw rotors to cause the change of the volume of an element consisting of a tooth space. A pair of screw rotors meshed with each other are arranged in parallel in a machine body of the screw compressor, and one end of each screw rotor is a suction end and is communicated with a suction port of the machine body; the other end is an exhaust end which is communicated with an exhaust port of the machine body. As the screw rotor rotates, gas is sucked in from the suction end and is compressed and discharged from the discharge end.
The situation that the actual working condition of the screw compressor is inconsistent with the ideal setting working condition exists in the operation process of the screw compressor, and the screw compressor needs to reach the ideal setting working condition through a certain adjusting means.
Disclosure of Invention
In the operation process of screw compression, there may be the condition of excessive compression, and the compressor in this application can carry out automatically regulated to the excessive compression phenomenon of compressor.
The screw compressor in this application includes: a housing having a rotor cavity; the pair of rotors are positioned in the rotor cavities, compression cavities can be formed between the teeth of the pair of rotors and the shell, the pair of rotors are provided with air suction ends and air discharge ends, and the air discharge ends are provided with air discharge end faces extending along the radial direction; a pressure relief passage disposed in said housing, said pressure relief passage having a pressure relief passage inlet communicable with said compression pocket and a pressure relief passage outlet communicable with a discharge side of a compressor; an adjustment device movably mounted on the housing and configured to controllably open or close a pressure relief passage inlet to enable the compression pocket to be communicated with or disconnected from the pressure relief passage.
According to the screw compressor described above, the adjusting device is configured to: when the pressure in the compression cavity of the screw compressor is higher than the pressure at the exhaust side of the compressor, the adjusting device opens the inlet of the pressure release channel, so that the compression cavity is communicated with the exhaust side of the compressor; when the pressure in the compression cavity of the screw compressor is smaller than the pressure on the exhaust side of the compressor, the adjusting device closes the inlet of the pressure release channel, so that the compression cavity is disconnected with the exhaust side of the compressor.
According to the above screw compressor, the casing further includes a connection passage having a connection passage inlet and a connection passage outlet, the connection passage inlet is close to the discharge ends of the pair of rotors and is capable of communicating with the compression cavity, and the connection passage outlet is communicated with the pressure release passage inlet.
According to the screw compressor, the shell further comprises an adjusting device containing cavity, and one end of the adjusting device containing cavity forms the connecting channel; the pressure relief passage inlet is located in a sidewall of the regulator cavity.
According to the screw compressor, the adjusting device has an outer side surface extending in the circumferential direction, the outer side surface can form a sealing side surface, and the adjusting device can move in the adjusting device accommodating cavity, so that the sealing side surface can open or close the pressure relief passage inlet.
According to the screw compressor described above, the regulating device has a head portion and a body portion, the size of the head portion is larger than the size of the body portion in the radial direction of the regulating device, and the seal side surface is located at the distal end of the body portion; the regulator pocket includes a first section and a second section, wherein a diameter of the second section is greater than a diameter of the first section, the first section is closer to the pair of rotors than the second section, the body is received in the first section, the head is received in the second section, and the head forms a seal with a sidewall of the second section in a circumferential direction.
According to the screw compressor, the head has a distal end surface and a proximal end surface, the body is connected to the proximal end surface, the head divides the second section into a first region and a second region, the first region is defined by the distal end surface and a sidewall of the second section, the second region is defined by the proximal end surface, an outer surface of the body and a sidewall of the second section, the first region is communicated with a discharge side of the compressor, the second region is communicated with the compression cavity, and volumes of the first region and the second region change along with movement of the adjusting device.
According to the above, the casing further includes a pressure regulating passage, the pressure regulating passage has a pressure regulating passage inlet and a pressure regulating passage outlet, the pressure regulating passage outlet is communicated with the second region, the pressure regulating passage inlet is communicated with the compression chamber, and in the axial direction of the pair of rotors, the pressure regulating passage inlet is closer to the suction end of the pair of rotors than the connection passage inlet.
According to the screw compressor, the casing has with the casing fitting surface that sets up in opposite directions of the exhaust terminal surface of the exhaust end of a pair of rotors, the connecting channel entry is located on the casing fitting surface, and can with the exhaust terminal surface coincidence, be equipped with the exhaust cavity opening on the casing fitting surface, on radial cross section, the connecting channel entry with certain interval has between the exhaust cavity opening.
According to the screw compressor, the rotor cavity is provided with the rotor cavity side wall, the pressure adjusting channel inlet is overlapped with the rotor cavity side wall, and a certain distance is formed between the pressure adjusting channel inlet and the exhaust end face in the axial direction of the pair of rotors.
The compressor in this application has a regulating device, a pressure regulating passage, a pressure relief passage and a pressure balancing passage. The adjusting device pushes the adjusting device to open or close the pressure release passage through the pressure change of the pressure adjusting passage and the pressure balancing passage so as to adjust the gas pressure in the compression cavity, thereby adjusting the over-compression phenomenon of the compressor. The adjustment device in the present application does not require manual intervention. The adjusting device has simple structure and is easy to manufacture and maintain.
Drawings
Fig. 1A is a perspective view of a screw compressor of a first embodiment in the present application;
FIG. 1B is an exploded view of the screw compressor of FIG. 1A;
FIG. 1C is an axial cross-sectional view of the screw compressor of FIG. 1A taken in the direction indicated by line A-A and viewed in the direction indicated by the arrows;
FIG. 2A is a perspective view of the rotor base of FIG. 1B;
FIG. 2B is a side view of the rotor base of FIG. 2A;
FIG. 2C is a cross-sectional view of the rotor base of FIG. 2B taken along line B-B;
FIG. 3A is a perspective view of the exhaust seat of FIG. 1B;
FIG. 3B is a view of the exhaust seat of FIG. 3B from the exhaust end face;
FIG. 3C is a cross-sectional view of the exhaust seat of FIG. 3B taken along line C-C;
FIG. 4 is a perspective view of the adjustment device of FIG. 1B;
FIG. 5A is a side view of the screw compressor of FIG. 1A;
FIG. 5B is a cross-sectional view of the screw compressor of FIG. 5A taken along line D-D;
FIG. 5C is a cross-sectional view of the screw compressor of FIG. 5A taken along line F-F;
FIG. 5D is another cross-sectional view of the screw compressor of FIG. 5A taken along line D-D;
FIG. 5E is another cross-sectional view of the screw compressor of FIG. 5A taken along line F-F;
FIG. 6 is a cross-sectional view of a rotor seat of a second embodiment of the screw compressor of the present application;
FIG. 7A is a side view of a second embodiment of a screw compressor of the present application;
FIG. 7B is a cross-sectional view of the screw compressor of FIG. 7A taken along line G-G;
fig. 7C is another sectional view of the screw compressor of fig. 7A taken along line G-G.
Detailed Description
Various embodiments of the present application will now be described with reference to the accompanying drawings, which form a part hereof. It should be understood that although directional terms, such as "front," "rear," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "forward," "reverse," "proximal," "distal," "transverse," "longitudinal," and the like may be used herein to describe various example features and elements of the disclosure, these terms are used herein for convenience of description only and are intended to be based on the example orientations shown in the drawings. Because the embodiments disclosed herein can be arranged in a variety of orientations, these directional terms are used for purposes of illustration only and are not to be construed as limiting.
Fig. 1A is a perspective view of a screw compressor according to an embodiment of the present application, fig. 1B is an exploded view of the screw compressor of fig. 1A, and fig. 1C is an axial sectional view of the screw compressor of fig. 1A taken along a direction indicated by a line a-a and viewed in a direction indicated by an arrow. Fig. 1A-1C show some components of a screw compressor. As shown in fig. 1A to 1C, the screw compressor includes a casing 101, a pair of screw rotors 110, and adjusting devices 108 and 109. Wherein the housing 101 includes a rotor holder 131 and an exhaust holder 132.
The rotor base 131 has a rotor receiving cavity 105 for receiving a pair of screw rotors 110. The rotor base 131 has a discharge chamber 180, and the discharge chamber 180 communicates with a discharge port 181 of the compressor.
The screw rotor 110 includes a pair of male and female rotors 121 and 122 engaged with each other, and the male and female rotors 121 and 122 can be driven to rotate. The screw rotor 110 includes a tooth portion 160, and shaft portions 161 and 162 connected to both ends of the tooth portion 160, respectively. At the teeth 160 of the screw rotor 110, the male rotor 121 has a plurality of helical teeth with grooves formed between adjacent teeth, and the female rotor 122 also has a plurality of helical teeth with grooves formed between adjacent teeth. The male and female rotors 121, 122 are formed with intermeshing teeth and corresponding grooves and cooperate with the housing 101 to define a compression pocket 150.
The tooth portion 160 of the screw rotor 110 has a suction end 112 and a discharge end 113 in the axial direction of the screw rotor 110. Gas is drawn into the compression pocket 150 at the suction end 112 and gradually moves toward the discharge end 113 as the screw rotor 110 rotates. Meanwhile, the volume of the compression volume 150 is also gradually reduced as the screw rotor 110 rotates, and the gas in the compression volume 150 is also gradually compressed. The compressed gas enters the discharge chamber 180 of the compressor from the discharge end 113 and is then discharged from the discharge port 181 of the compressor. The exhaust end 113 has an exhaust end face 118.
Fig. 2A is a perspective view of the rotor holder of fig. 1B, fig. 2B is a side view of the rotor holder of fig. 2A, and fig. 2C is a sectional view of the rotor holder of fig. 2B taken along line B-B. As shown in fig. 2A-2C, the rotor base includes a forward end 211 and a rearward end 212. The front end 211 is adjacent to the suction end 112 of the screw rotor 110 and the rear end 212 is adjacent to the discharge end 113 of the screw rotor 110. The rear end 212 is coupled to the exhaust seat 132, and the rear end 212 has a rear end face 207. Rotor cavity 105 extends through rear end face 207 forming a rotor cavity opening 215. Rotor cavity 105 has a rotor cavity side wall 188, rotor cavity side wall 188 being capable of forming a seal with teeth 160 of a pair of screw rotors. The rotor base 131 has a rotor base pressure regulating passage 240. The rotor base pressure regulating passage 240 has an inlet 241 and an outlet 242, wherein the inlet 241 is located on the rotor chamber side wall 188 at a distance from the rear end face 207. The outlet 242 is located on the rear end face 207.
The distance between the inlet 241 and the aft end face 207 may be adjusted as required by the particular configuration of the screw compressor. In one embodiment of the present application, the distance between the inlet 241 and the rear end face 207 is less than half the length of the tooth 160 of the screw rotor 110 in the axial direction.
Fig. 3A is a perspective view of the exhaust seat of fig. 1B, fig. 3B is a view of the exhaust seat of fig. 3B as viewed from the exhaust end face, and fig. 3C is a sectional view of the exhaust seat of fig. 3B taken along line C-C.
As shown in fig. 3A-3C, exhaust seat 132 has a first end 311 and a second end 312, first end 311 being coupled to rotor seat 131. An end surface of the first end 311 forms a housing mating surface 341, and the housing mating surface 341 is mated with the rear end surface 207 of the rotor holder 131.
The exhaust seat 132 has rotor shaft pockets 361 and 362, an exhaust chamber 180, modulation device pockets 310 and 320, and pressure relief passages 328 and 329.
The housing mating surface 341 has a rotor projected area 382, and the rotor projected area 382 is a projected area formed on the housing mating surface 341 along the axial direction during rotation of the pair of screw rotors 110. Rotor projection area 382 is generally "8" shaped and is disposed about rotor shaft openings 371 and 372.
During rotation of the pair of screw rotors 110, the range swept by the discharge end face 118 at the housing mating face 341 is within the range defined by the rotor projected area 382. Rotor projection area 382 has a seal area 326 and first open area 337, second open areas 338 and 339. Wherein the overlap of the exhaust plenum opening 366 with the rotor projected area 382 forms a first open area 337, the overlap of the conditioner plenum openings 367 and 368 with the rotor projected area 382 forms second open areas 338 and 339, and the remainder forms the seal area 326. The second opening regions 338 and 339 are respectively located downstream of the rotation direction of the corresponding screw rotor with respect to the first opening region 337. That is, the screw rotor passes through the second opening regions 338 and 339 during rotation and then reaches the first opening region 337.
The sealing region 326 can seal the end of the compression volume 150 such that the compression volume 150 can form a sealed space. During rotation of the pair of screw rotors 110, when the ends of the compression volume 150 are aligned with the sealing areas 326, the compression volume 150 is disconnected from the discharge plenum 180 and the refrigerant gas in the compression volume 150 can be compressed; when the end of compression volume 150 is aligned or partially aligned with first open region 337, compression volume 150 can communicate with vent chamber 180 and gas in compression volume 150 can be vented; the compression volume 150 is selectively in and out of communication with the pressure relief passages 328 and 329 when the end of the compression volume 150 is aligned with or partially aligned with the second open regions 338 and 339. The selective communication of compression volume 150 with pressure relief passages 328 and 329 will be described in detail below. The structure of the regulator housing 310 and 320 and the pressure relief passages 328 and 329 are similar and different in this application, and the structure of the regulator housing 320 and the vent seat pressure relief passage 329 will be described as an example.
As shown in FIG. 3C, the regulator housing 320 is formed by extending the regulator housing opening 368 into the interior of the exhaust seat. The distal end of the regulator housing 320 (i.e., the end distal from the regulator housing opening 367) has a bottom wall 383. The conditioner housing 320 has a first section 321 and a second section 322, the first section 321 being proximate to the conditioner housing opening 367, and the second section 322 being proximate to the bottom wall 383. The diameter of the second section 322 is greater than the diameter of the first section 321 such that the junction of the first section 321 and the second section 322 forms a step surface 335. The regulator housing 320 is shaped to cooperate with the regulator 109 such that the regulator 109 is movable within the regulator housing 320.
In this application, to facilitate assembly of the adjustment devices 108 and 109, the exhaust seat 132 includes separable sleeves 357 and 358. The sleeves 357 and 358 are fixedly attached to the exhaust seat body after the adjustment devices 108 and 109 are installed in the exhaust seat body. The sleeves 357 and 358 are generally cylindrical with the sidewalls of the sleeves 357 and 358 enclosing the first section 321. The side walls of the sleeves 357 and 358 have openings to form the connection passage outlets. A step surface 335 is formed by the end surface of one end of the sleeve 358.
One end of regulator housing 320 has a connecting passage 398, and connecting passage 398 is formed by a portion of first section 321 of regulator housing 320 near regulator housing opening 367. That is, the connecting channel 398 is one of the first segments 321. In the present embodiment, connecting passage 398 is the portion of regulator housing 320 in FIG. 3C that is below the dashed line. The connecting channel 398 has a connecting channel inlet 396 and a connecting channel outlet 397, the connecting channel inlet 396 being formed by a portion of the regulator volume opening 368, and the connecting channel inlet 396 coinciding with the second opening region 338. The connecting passage outlet 397 is located in a side wall of the first section 321 of the modulation device receptacle 320.
The exhaust seat pressure relief passage 329 has an inlet 316 and an outlet 317, wherein the inlet 316 is located on a sidewall of the first section 321 of the modulation device plenum 320 and coincides with the connection passage outlet 397. The connection passage outlet 397 is located on a sidewall of the discharge chamber 180 and communicates with the discharge chamber 180.
The exhaust seat 132 also includes an exhaust seat pressure regulation passage 334 and a pressure balancing passage 355. The inlet 332 of the exhaust seat pressure regulating passage 334 communicates with the rotor seat pressure regulating passage outlet 242, and the outlet 333 of the exhaust seat pressure regulating passage 334 communicates with the second section 322 of the regulating device plenum 320. The outlet 333 of the exhaust seat pressure regulating passage 334 is located on the sidewall of the second section 322, adjacent to the first section 321.
A first end of the pressure equalization passage 355 communicates with the second section 322 of the modulation device plenum 310 and a second end of the pressure equalization passage 355 communicates with the vent chamber 180. The connection of the first end of the pressure equalizing passage 355 to the regulator housing 310 is located on a side wall of the regulator housing 310 and adjacent to a bottom wall 383 of the regulator housing 310. In another embodiment of the present application, the connection is located on a bottom wall 383 of the conditioner housing 310.
Fig. 4 is a perspective view of the adjustment device 109 of fig. 1B, and as shown in fig. 4, the adjustment device 109 is a piston having a head 411 and a body 412. Wherein the diameter of the head 411 is larger than the diameter of the body 412, the outer diameter of the head 411 matches the inner diameter of the second section 322 of the accommodation device compartment 320, the outer diameter of the body 412 matches the inner diameter of the first section 321 of the accommodation device compartment 320, the head 411 is accommodated in the second section 322, and the body 412 is accommodated in the first section 321. Wherein in the axial direction the second section 322 of the adjusting device compartment 320 has a length which is greater than the length of the head 411 of the adjusting device 109, and the first section 321 of the adjusting device compartment 320 has a length which is less than the length of the body 412 of the adjusting device 109, so that the adjusting device 109 can be moved within a certain range in the axial direction within the adjusting device compartment 320. The head 411 has a distal surface 441 and a proximal surface 442, the body 412 being connected to the proximal surface 442.
The body part 412 has an outer side 401 extending in the circumferential direction, which outer side 401 can form a sealing side 423, which sealing side 423 can open or close the pressure relief passage inlet 316 when the adjustment device 109 is moved in the adjustment device compartment 320. The distal end of the body portion 412 (i.e., the end distal from the head portion 411) has an adjustment device sealing end face 455. The shape of the regulator sealing end surface 455 matches the shape of the regulator receiving cavity opening 368 such that the regulator sealing end surface 455 is capable of sealing the regulator receiving cavity opening 368.
The outer side of the head 411 in the circumferential direction may be sleeved with a sealing ring to enhance the sealing between the head 411 and the sidewall of the second section 322.
Fig. 5A is a side view of the screw compressor of fig. 1A, fig. 5B is a sectional view of the screw compressor of fig. 5A taken along the line D-D, fig. 5C is a sectional view of the screw compressor of fig. 5A taken along the line F-F, fig. 5D is another sectional view of the screw compressor of fig. 5A taken along the line D-D, fig. 5E is another sectional view of the screw compressor of fig. 5A taken along the line F-F, fig. 5B and 5C show a state where the pressure release passage is in a closed position, and fig. 5D and 5E show a state where the pressure release passage is in an open position.
As shown in fig. 5B, the length of the body portion 412 of the adjustment device 109 is greater than the length of the first section 321 of the adjustment device compartment 320, and the diameter of the body portion 412 is smaller than the diameter of the second section 322 of the adjustment device compartment 320. The head 411 is spaced from the step surface 335. The head 411 divides the second segment 322 into a first region 551, the first region 551 being bounded by the distal surface 441 and the side wall of the second segment 322, and a second region 552 bounded by the proximal surface 442, the outer surface of the body 412 and the side wall of the second segment 322, the first region 551 communicating with the discharge side of the compressor, the second region 552 communicating with the compression volume 150, the volumes of the first region 551 and the second region 552 varying with the movement of the adjustment means 109.
The housing 101 has a pressure regulating passage 540, and the pressure regulating passage 540 is formed by connecting the rotor seat pressure regulating passage 240 and the pressure regulating passage 334. The pressure-adjusting passage inlet 541 is formed by the rotor-holder pressure-adjusting passage inlet 241, and the pressure-adjusting passage outlet 542 is formed by the outlet 333 of the discharge-holder pressure-adjusting passage 334. The outlet 542 of the pressure regulating passage is located on the sidewall of the second region 552, and the pressure equalizing passage 355 communicates with the first region 551. The pressure of the gas in second region 552 is equal to the pressure of the gas at pressure regulating passage inlet 541 and the pressure of the gas in first region 551 is equal to the pressure of the gas in pressure vent chamber 180. When the gas pressure in the exhaust chamber 180 is greater than the gas pressure at the pressure regulating passage inlet 541, the regulating device is subjected to pressure to the left as in fig. 5B, enters the connecting passage 398 and closes the pressure relief passage. When the end of screw rotor 110 compression volume 150 is in communication with discharge chamber opening 366, the gas in the compression volume is vented. When the gas pressure in the exhaust chamber 180 is less than the gas pressure at the pressure regulating passage inlet 541, the regulating device is subjected to pressure to the right in fig. 5B, leaving the connecting passage 398 and opening the pressure relief passage. The end of compression volume 150 is first rotated into communication with regulator volume opening 368 and not rotated to reach vent volume opening 366, the gas in the compression volume is prematurely vented through pressure relief passage 329.
As shown in fig. 5B and 5C, in the closed position of the pressure relief duct, the adjustment device 109 rests against the rotor seat rear end face 207, with the body 412 of the adjustment device 109 lying in the connecting duct 398 and filling the connecting duct 398, so that the connecting duct 398 is closed. The regulator receiving chamber opening 368 is closed by the regulator sealing end face 455 and the inlet 316 of the pressure relief channel 329 is closed by the sealing side face 423. With the pressure relief passage in the closed position, the rotor volume 105 needs to be rotated into communication with the vent chamber opening 366 and the gas in the rotor volume 105 is vented to the vent chamber 180.
As shown in fig. 5D and 5E, the adjustment device 109 leaves the rotor seat rear end face 207 in the open position of the pressure relief passage, at which point the body 412 of the adjustment device 109 leaves the connecting passage 398, so that the connecting passage 398 is opened. The regulator volume opening 368 communicates with the compression volume 150 and the inlet 316 of the pressure relief passage 329 communicates with the connecting passage 398. With the pressure relief passage in the open position, the compression volume 150 is in communication with the modulation device volume opening 368 and does not reach the vent chamber opening 366, gas in the rotor volume 105 is vented to the vent chamber 180 through the pressure relief passage 329. That is, when the pressure relief passage is in the open position, gas in the compression volume 150 is vented prematurely, thereby reducing the pressure in the compression volume 150 and avoiding over-compression where the pressure in the compression volume 150 is greater than the exhaust side pressure.
The adjustment device 109 is automatically adjusted by pressure changes in the pressure adjustment passage 540 and the pressure equalization passage 355 without manual intervention. The adjustment device 109 is simple in construction and easy to manufacture and maintain.
Fig. 6 is a sectional view of a rotor holder of a second embodiment of a screw compressor of the present application, fig. 7A is a side view of the second embodiment of the screw compressor of the present application, fig. 7B is a sectional view of the screw compressor of fig. 7A taken along the line G-G, fig. 7C is another sectional view of the screw compressor of fig. 7A taken along the line G-G, fig. 7B shows a state where a pressure release passage is in a closed position, and fig. 7C shows a state where the pressure release passage is in an open position.
As shown in fig. 6, the rotor base has a regulation device chamber 610, a pressure regulation passage 640, a pressure release passage 629 and a pressure equalization passage 655. The turning device volume 610 has a turning device volume opening 668, the turning device volume opening 668 being located on the side wall of the rotor volume. The conditioner housing 610 has a first section 611, a second section 612 and a third section 613. The diameters of the first segment 611, the second segment 612 and the third segment 613 increase in order. The inlet 641 of the pressure-regulating passage 640 communicates with the compression volume and the inlet 641 of the pressure-regulating passage 640 is closer to the suction end of the pair of rotors than the regulator volume 610. As shown in fig. 6, the inlet 641 of the pressure regulating passage 640 is located on the left side of the regulator receiving chamber 610. The outlet of the pressure relief channel 629 communicates with the exhaust cavity and the inlet 616 of the pressure relief channel 629 communicates with the first section 611 and is located on the sidewall of the first section 611. The inlet 616 of pressure relief passage 629 is spaced from the side wall of the rotor cavity. One end of the pressure equalizing passage 655 communicates with the second section 612 and the other end communicates with the exhaust chamber. A first section of the modulation device volume 610 near one end of the rotor volume forms a connecting channel 698. The connecting passage 698 communicates with the pressure relief passage 629. The conditioner volume 610 has a conditioner volume opening 668.
The embodiment shown in fig. 6-7C is similar to the embodiment shown in fig. 1A, except that an adjustment device 709 is provided in the rotor base 131 and is arranged in a direction substantially perpendicular to the pair of screw rotors 110.
As shown in fig. 7B and 7C, the adjustment device 709 has a body portion 712, a head portion 711 and an extension 713, the head portion 711 being located in the second section 612 of the adjustment device receptacle 610 and the body portion 712 being located in the first section 611 of the adjustment device receptacle 610. The head has a proximal surface 742 and a distal surface 741, the body being connected to proximal surface 742 and extension 713 being connected to distal surface 741. The extension 713 is coupled to the head 711 for ease of assembly and retention. The diameter of the extension 713 and the body 712 are each smaller than the diameter of the head 711. The length of the body 712 of the adjustment device 709 is greater than the length of the first section 611 of the adjustment device receptacle 610 and the diameter of the body 712 is smaller than the diameter of the second section 612 of the adjustment device receptacle 610. The head 711 divides the second section 612 into a first zone 751, which is delimited by a head distal surface 741, the outer wall of the extension 713 and the side wall of the second section 612, and a second zone 752, which is delimited by a head proximal surface 742, the outer surface of the body 712 and the side wall of the second section 612, the first zone 751 communicating with the discharge side of the compressor through the pressure regulation channel 640, the second zone 752 communicating with the compression volume 750 through the pressure equalization channel 655, the volumes of the first zone 751 and the second zone 752 varying with the movement of the regulation means 109.
As shown in fig. 7B, when the pressure relief passage is in the closed position, the end face of the body 712 of the adjustment device 709 is flush with the adjustment device receptacle opening 668, and the body 712 of the adjustment device 709 is now located in the connection passage 698 and fills the connection passage 698, so that the connection passage 698 is closed. The regulator-chamber opening 668 is closed by the end face of the body 712 of the regulator 709 and the inlet 616 of the pressure relief passage 629 is closed by the side face of the body of the regulator 709. When the pressure relief passage is in the closed position, the compression pocket needs to be rotated to a position in communication with the vent chamber opening, and the gas in the compression pocket can be vented to the vent chamber 180.
As shown in fig. 7C, with the pressure relief passage in the open position, the regulator 709 exits the regulator volume opening 668, at which point the body 712 of the regulator 709 exits the connecting passage 698, so that the connecting passage 698 is opened and the inlet 616 of the pressure relief passage 629 communicates with the compression volume through the connecting passage 698. When the pressure relief passage is in the open position, compressing the cavity to a position in communication with the regulator device cavity opening 668 and not to the vent cavity opening, the gas in the rotor cavity may be vented to the vent cavity through the pressure relief passage. That is, when the pressure relief passage is in the open position, gas in the compression volume is vented prematurely, thereby reducing the pressure in the compression volume and avoiding over-compression where the pressure in the compression volume is greater than the discharge side pressure.
The embodiments shown in fig. 6-7C can achieve the same technical effects as the embodiment shown in fig. 1A.
While the present disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and/or substantial equivalents, whether known or that are or may be presently foreseen, may become apparent to those of ordinary skill in the art. Additionally, the technical effects and/or technical problems described in this specification are exemplary rather than limiting; the disclosure in this specification may be used to solve other technical problems and have other technical effects and/or may be used to solve other technical problems. Accordingly, the examples of embodiments of the present disclosure set forth above are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit or scope of the disclosure. Accordingly, the present disclosure is intended to embrace all known or earlier-developed alternatives, modifications, variations, improvements, and/or substantial equivalents.
Claims (10)
1. A screw compressor characterized by comprising:
a housing (101), the housing (101) having a rotor receptacle (105);
a pair of rotors (110), the pair of rotors (110) being located in the rotor cavity (105), teeth of the pair of rotors (110) and the housing (101) being capable of forming a compression cavity (150) therebetween, the pair of rotors (110) having a suction end (112) and a discharge end (113), the discharge end (113) having a discharge end face (118) extending in a radial direction;
a pressure relief channel disposed in said housing (101), said pressure relief channel having a pressure relief channel inlet communicable with said compression volume (150) and a pressure relief channel outlet communicable with a discharge side of a compressor;
an adjustment device movably mounted on the housing (101) and configured to controllably open or close a pressure relief passage inlet to enable communication or disconnection of the compression volume (150) with the pressure relief passage.
2. The screw compressor according to claim 1, wherein:
the adjustment device is configured to: when the pressure in the compression cavity (150) of the screw compressor is larger than the pressure at the exhaust side of the compressor, the adjusting device opens the pressure release channel inlet so that the compression cavity is communicated with the exhaust side of the compressor; when the pressure in the compression volume (150) of the screw compressor is less than the pressure at the discharge side of the compressor, the regulating device closes the pressure relief passage inlet, so that the compression volume is disconnected from the discharge side of the compressor.
3. The screw compressor according to claim 1, wherein:
the housing (101) further includes a connecting passage having a connecting passage inlet proximate the discharge ends of the pair of rotors and communicable with the compression pockets (150) and a connecting passage outlet in communication with the pressure relief passage inlet.
4. The screw compressor according to claim 1, wherein:
the shell (101) further comprises an adjusting device accommodating cavity, and one end of the adjusting device accommodating cavity forms the connecting channel; the pressure relief passage inlet is located in a sidewall of the regulator cavity.
5. The screw compressor according to claim 4, wherein:
the adjusting device has an outer side surface extending in the circumferential direction, the outer side surface being capable of forming a sealing side surface, the adjusting device being movable in the adjusting device receiving chamber such that the sealing side surface is capable of opening or closing the pressure relief passage inlet.
6. The screw compressor according to claim 5, wherein:
the adjusting device is provided with a head part and a body part, the size of the head part is larger than that of the body part in the radial direction of the adjusting device, and the sealing side surface is positioned at the far end of the body part;
the regulator pocket includes a first section and a second section, wherein a diameter of the second section is greater than a diameter of the first section, the first section is closer to the pair of rotors than the second section, the body is received in the first section, the head is received in the second section, and the head forms a seal with a sidewall of the second section in a circumferential direction.
7. The screw compressor according to claim 6, wherein:
the head has a distal end surface and a proximal end surface, the body is connected to the proximal end surface, the head divides the second section into a first region and a second region, the first region is enclosed by the distal end surface and a sidewall of the second section, the second region is enclosed by the proximal end surface, an outer surface of the body and a sidewall of the second section, the first region is communicated with a discharge side of the compressor, the second region is communicated with the compression cavity, and volumes of the first region and the second region change with movement of the adjustment device.
8. The screw compressor according to claim 7, wherein:
the casing still includes the pressure regulating passageway, the pressure regulating passageway has pressure regulating passageway entry and pressure regulating passageway export, the pressure regulating passageway export with the second area intercommunication, the pressure regulating passageway entry with the compression holds the chamber intercommunication, in the axial direction of a pair of rotors, the pressure regulating passageway entry compare in the connecting channel entry is closer to the end of breathing in of a pair of rotors.
9. A screw compressor according to claim 3, wherein:
the shell is provided with a shell matching surface which is arranged opposite to the exhaust end surfaces of the exhaust ends of the rotors, the inlet of the connecting channel is positioned on the shell matching surface and can coincide with the exhaust end surfaces, the shell matching surface is provided with an exhaust cavity opening, and a certain distance is reserved between the inlet of the connecting channel and the exhaust cavity opening on the radial section.
10. A screw compressor according to claim 3, wherein:
the rotor cavity is provided with a rotor cavity side wall, the pressure adjusting channel inlet is overlapped with the rotor cavity side wall, and a certain distance is reserved between the pressure adjusting channel inlet and the exhaust end face in the axial direction of the pair of rotors.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210221925.3A CN114688024B (en) | 2022-03-09 | 2022-03-09 | Screw compressor |
| PCT/US2023/014847 WO2023172650A1 (en) | 2022-03-09 | 2023-03-08 | Screw compressor |
| TW112108799A TW202348900A (en) | 2022-03-09 | 2023-03-09 | Screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210221925.3A CN114688024B (en) | 2022-03-09 | 2022-03-09 | Screw compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114688024A true CN114688024A (en) | 2022-07-01 |
| CN114688024B CN114688024B (en) | 2024-04-05 |
Family
ID=82137069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210221925.3A Active CN114688024B (en) | 2022-03-09 | 2022-03-09 | Screw compressor |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN114688024B (en) |
| TW (1) | TW202348900A (en) |
| WO (1) | WO2023172650A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021535A (en) * | 2009-07-15 | 2011-02-03 | Hitachi Appliances Inc | Screw compressor |
| CN102588281A (en) * | 2011-01-05 | 2012-07-18 | 黄秀保 | Screw compressor with a shunt pulsation trap |
| CN204961294U (en) * | 2015-09-25 | 2016-01-13 | 江森自控空调冷冻设备(无锡)有限公司 | But helical -lobe compressor of automatically regulated inner volume ratio |
| CN110425134A (en) * | 2019-08-16 | 2019-11-08 | 珠海格力电器股份有限公司 | Compressor with advance exhaust function and air conditioning system |
| CN111852858A (en) * | 2020-07-28 | 2020-10-30 | 烟台大学 | Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233027A (en) * | 2004-02-18 | 2005-09-02 | Denso Corp | Screw compressor |
| DE102006016318B4 (en) * | 2006-04-06 | 2008-06-05 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Screw compressor with relief valve |
| US8082747B2 (en) * | 2008-12-09 | 2011-12-27 | Thermo King Corporation | Temperature control through pulse width modulation |
| JP6006531B2 (en) * | 2012-05-22 | 2016-10-12 | 株式会社神戸製鋼所 | Screw compressor |
| CN113982916A (en) * | 2021-09-18 | 2022-01-28 | 江森自控空调冷冻设备(无锡)有限公司 | Compressor |
-
2022
- 2022-03-09 CN CN202210221925.3A patent/CN114688024B/en active Active
-
2023
- 2023-03-08 WO PCT/US2023/014847 patent/WO2023172650A1/en unknown
- 2023-03-09 TW TW112108799A patent/TW202348900A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021535A (en) * | 2009-07-15 | 2011-02-03 | Hitachi Appliances Inc | Screw compressor |
| CN102588281A (en) * | 2011-01-05 | 2012-07-18 | 黄秀保 | Screw compressor with a shunt pulsation trap |
| CN204961294U (en) * | 2015-09-25 | 2016-01-13 | 江森自控空调冷冻设备(无锡)有限公司 | But helical -lobe compressor of automatically regulated inner volume ratio |
| CN110425134A (en) * | 2019-08-16 | 2019-11-08 | 珠海格力电器股份有限公司 | Compressor with advance exhaust function and air conditioning system |
| CN111852858A (en) * | 2020-07-28 | 2020-10-30 | 烟台大学 | Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023172650A1 (en) | 2023-09-14 |
| CN114688024B (en) | 2024-04-05 |
| TW202348900A (en) | 2023-12-16 |
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