CN114033685A - Screw compressor and screw refrigerating unit - Google Patents
Screw compressor and screw refrigerating unit Download PDFInfo
- Publication number
- CN114033685A CN114033685A CN202111532820.1A CN202111532820A CN114033685A CN 114033685 A CN114033685 A CN 114033685A CN 202111532820 A CN202111532820 A CN 202111532820A CN 114033685 A CN114033685 A CN 114033685A
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- Prior art keywords
- male
- rotor cavity
- screw compressor
- pairs
- screw
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- 238000005057 refrigeration Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 abstract description 20
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003507 refrigerant Substances 0.000 description 21
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000013526 supercooled liquid Substances 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- 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
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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 invention discloses a screw compressor and a screw refrigerating unit, wherein the screw compressor comprises two pairs of male and female rotors and a motor for driving the two pairs of male and female rotors to rotate, the two pairs of male and female rotors are respectively arranged in a first section of independent rotor cavity and a second section of independent rotor cavity, and the two pairs of male and female rotors respectively and independently suck, compress and exhaust air. The screw compressor with two pairs of rotors for parallel compression of air suction and air supplement is used in screw refrigerating unit, and can supplement air under any pressure ratio. And simultaneously, the problem of leakage increase after air supplement enters the middle cavity is solved. The air supplement effect is greatly increased, the refrigerating capacity is improved, and the energy efficiency ratio of the unit is improved.
Description
Technical Field
The invention relates to fluid conveying equipment, in particular to a screw compressor and a screw refrigerating unit.
Background
The basic working principle of the screw compressor is that a pair of male and female rotors are meshed with each other to make rotary motion, and by means of a cylinder body surrounding the peripheries of the rotors and two end sealing covers, the volume of a space formed by the tooth surface of the rotor and the inner wall surface of the cylinder is changed periodically, so that the sucked gas is compressed to a certain pressure along the axial direction of the rotors and then is discharged.
The screw refrigerating unit mainly comprises a compressor, a condenser, a throttle valve and an evaporator. The low-temperature low-pressure saturated refrigerant after being cooled and depressurized by the throttle valve enters the evaporator, the low-temperature low-pressure liquid refrigerant absorbs heat from a cooled object and is vaporized, the vaporized low-pressure low-temperature superheated refrigerant is discharged from an outlet of the evaporator, and is then sucked by the compressor through an inlet of the compressor and is compressed, and simultaneously much heat is emitted, the compressed high-temperature high-pressure superheated refrigerant gas enters the condenser through the exhaust pipe, is cooled in the condenser and emits heat, is condensed into the normal-temperature high-pressure subcooled liquid refrigerant, and then enters the evaporator after being cooled and depressurized by the throttle valve, so that a refrigeration cycle is completed, and the whole refrigeration cycle is repeated.
In order to improve the operation economy of the screw unit and reduce the energy consumption of the screw unit, an economizer part is added to the screw unit, and an intermediate compression cavity of the compressor is supplemented with air so as to improve the refrigerating capacity of the unit, improve the energy efficiency ratio of the unit and achieve the effects of cold capacity improvement and energy saving and consumption reduction. The economizer part commonly used in the market is provided with a flash tank or a plate heat exchanger, and saturated refrigerant vapor after throttling is sprayed into a middle compression cavity of a compressor to complete air supplement. However, under the operation condition of low pressure ratio, the air supply pressure difference is not enough, the air supply pressure difference is difficult to spray into the middle air supply cavity, and an air supply structure cannot be arranged; the large-discharge compressor is influenced by the structural space, the size of the air supplement port is limited, a good air supplement effect is difficult to achieve, the power consumption is increased, meanwhile, the gas supplemented into the middle cavity is too little, and the refrigerating capacity is difficult to obviously improve; the gas supplementing structure of the middle cavity of the compressor can generally bring about the pressure rise of the middle cavity for supplementing gas, so that the pressure difference between the middle cavity and the low-pressure cavity is increased, compressed gas is aggravated to be leaked through tooth top gaps or other leakage channels, and the gas supplementing effect is reduced.
Therefore, how to overcome the defects of inconvenient air supply and low air supply efficiency in the operation of the conventional screw unit is a problem to be solved urgently in the industry.
Disclosure of Invention
The invention provides a suction and air supplement parallel compression screw compressor with convenient air supplement and high air supplement efficiency and a screw refrigerating unit, aiming at solving the problems of inconvenient air supplement and low air supplement efficiency in the operation of the conventional screw unit.
The invention provides a screw compressor which comprises two pairs of male and female rotors and a motor for driving the two pairs of male and female rotors to rotate, wherein the two pairs of male and female rotors are respectively arranged in two independent first-section and second-section rotor cavities, and the two pairs of male and female rotors respectively and independently suck, compress and exhaust air.
Preferably, the male rotors of the two pairs of male and female rotors are coaxially connected and driven by the motor.
Preferably, the first section of rotor cavity body and the second section of rotor cavity body are manufactured in a split mode and then are butted into a whole, and the separation position between the first section of rotor cavity body and the second section of rotor cavity body is sealed through a shaft seal.
Preferably, first section, second section rotor cavity system make integrative rotor cavity, will through the baffle integrative rotor cavity separates to seal into two independence first section, second section rotor cavity.
Preferably, the air suction capacity of the second-stage rotor cavity is 10% -40% of the air suction capacity of the first-stage rotor cavity.
Preferably, the motor is arranged in any one of the rotor cavities of the first section of rotor cavity and the second section of rotor cavity.
Preferably, the motor is arranged between the two pairs of male and female rotors.
Preferably, the motor is arranged at the outer ends of the male and female rotors in the first section of rotor cavity or the second section of rotor cavity.
The invention also provides a screw refrigerating unit with the screw compressor, which comprises a condenser, an evaporator and an economizer, wherein the air suction port of the first section of the rotor cavity of the screw compressor is communicated with the air outlet of the evaporator, and the air outlet of the first section of the rotor cavity is communicated with the air inlet of the condenser; the suction port of the second section of the rotor cavity is communicated with the gas outlet of the economizer, the gas outlet of the second section of the rotor cavity is communicated with the gas inlet of the condenser, and the gas outlet of the economizer is communicated with the gas inlet of the evaporator.
Preferably, the economizer is a flash tank or a plate heat exchanger.
The screw compressor provided by the invention is provided with two pairs of male and female rotors which are respectively positioned in two independent spaces, wherein the pair of male and female rotors in the first section of rotor cavity compresses superheated refrigerant gas flowing out of an evaporator; and the other pair of the male and female rotors is arranged in a second section of the rotor cavity, the saturated vapor refrigerant throttled by the economizer is compressed, and the two paths of compressed refrigerants jointly enter the condenser to form the screw compressor with two pairs of rotors for sucking air and supplementing air and compressing in parallel and the screw refrigerating unit thereof. The invention can supplement air under any pressure ratio working condition, and the opening of the air supplementing hole is not limited by the structure and can be compatible and matched with the discharge capacity.
And simultaneously, the problem of leakage increase after air supplement enters the middle cavity is solved. The air supplement effect is greatly increased, the refrigerating capacity is improved, and the energy efficiency ratio of the unit is improved.
Drawings
FIG. 1 is a schematic view of a refrigeration unit having a screw compressor of the present invention;
FIG. 2 is a cross-sectional view of an embodiment of the screw compressor of the present invention;
fig. 3 is a pressure-enthalpy diagram of the screw refrigerating unit of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
Fig. 1 shows an embodiment of a screw compressor and a screw refrigerating unit according to the present invention. The screw refrigerating unit comprises an evaporator 101, a screw compressor 102, a condenser 103, a first throttling device 104, a second throttling valve 106 and an economizer, and a refrigerating cycle system is formed by the basic elements. The economizer comprises a flash evaporator, a plate heat exchanger and the like, and the flash evaporator 105 is selected as the economizer of the embodiment.
As shown in fig. 1 and 2, the screw compressor 102 with two pairs of rotors for parallel compression of air suction and air compensation provided by the present invention in the screw refrigerating unit includes a housing formed by a first section of rotor cavity 11 and a second section of rotor cavity 12, wherein the first section of rotor cavity 11 is provided with a larger pair of male and female rotors 13, the second section of rotor cavity 12 is provided with a smaller pair of male and female rotors 14, and the male rotors of the two pairs of male and female rotors 13 and 14 are coaxially connected and driven to rotate by a motor 15. The first stage rotor cavity 11 is provided with an air inlet 10 and an air outlet 20, and the second stage rotor cavity 12 is also provided with an air inlet 30 and an air outlet 40. The rotors 13 and 14 in the first and second rotor cavities 11 and 12 independently perform air suction, compression and exhaust. The shell formed by the first section of the rotor cavity 11 and the second section of the rotor cavity 12 can be manufactured into independent cavities by adopting a split mode and then are butted into a whole, and the separation position between the first section of the rotor cavity 11 and the second section of the rotor cavity 12 needs to be sealed by using a shaft seal. The complete shell can also be integrally manufactured, and the inner cavity of the shell is divided and sealed into two independent first-section rotor cavities 11 and second-section rotor cavities 12 through the partition plates. The partition plate is provided with a through hole of the male rotor shaft, and the through hole is sealed. The screw compressor 102 provided by the invention is mainly used for a system for parallel compression of air suction and air supplement. The suction capacity of the second stage rotor cavity 12 depends on the suction capacity of the first stage rotor cavity 11 and the type of economizer chosen. For the consideration of economic design and maximum energy efficiency improvement, the air suction capacity of the second-stage rotor cavity 12 is selected (the air suction capacity determined by the design of the male and female rotors 14 in the second-stage rotor cavity 12) to account for 10% -40% of the air suction capacity of the first-stage rotor cavity 11 (the air suction capacity determined by the design of the male and female rotors 13 in the first-stage rotor cavity 11). For example, the air suction capacity of the first stage rotor cavity 11 is 1000 m/h, and the air suction capacity of the second stage rotor cavity 12 is about 100-400 m/h.
As shown in fig. 1 and 2, the motor 15 may be disposed in any one of the first and second rotor cavities 11 and 12. For example, as shown in fig. 1, the motor 15 is disposed in the second stage of the rotor cavity 12 and between the two pairs of male and female rotors 13, 14. The motor 15 can also be arranged at the outer ends of the male and female rotors 13, 14 of the first-stage rotor cavity 11 or the second-stage rotor cavity 12. For example, as shown in fig. 2, the motor 15 is disposed in the first stage of the rotor cavity 11 and is located at the outer end (right side) of the male and female rotors 13 therein. Similarly, the motor 15 can also be disposed in the second section of the rotor cavity 12 and located at the outer end (left side) of the male and female rotors 14.
As shown in fig. 1, the present invention further provides a screw refrigerating unit having the screw compressor of the present invention, the suction port 10 of the first stage rotor cavity 11 of the screw compressor 102 is communicated with the air outlet 50 of the evaporator 101, and the exhaust port 20 of the first stage rotor cavity 11 is communicated with the air inlet 90 of the condenser 103; the air suction port 30 of the second-stage rotor cavity 12 is communicated with the air outlet 80 of the flash tank 105, the air outlet 40 of the second-stage rotor cavity 12 is communicated with the air inlet 90 of the condenser 103, and the air outlet 80 of the flash tank 105 is also communicated with the air inlet 60 of the evaporator 101.
As shown in the pressure-enthalpy diagram of the system of fig. 3, wherein the ordinate P represents the pressure; the abscissa H represents the enthalpy. Referring to fig. 1, the superheated refrigerant flowing out of the evaporator 101 flows into the suction port 10 (reference numeral 1 in fig. 3) of the first stage rotor cavity 11 of the screw compressor 102, is compressed by the male and female rotors 13 in the first stage rotor cavity 11 (reference numeral 1-2 in fig. 3), and is discharged into the condenser 103 through the exhaust port 20 of the first stage rotor cavity 11; the saturated refrigerant gas throttled by the flash tank 105 is sprayed into the suction port 30 of the second-stage rotor cavity 12 (the process numbered 4-6 in fig. 3), compressed by the male and female rotors 14 of the second-stage rotor cavity 12 (the process numbered 6-7 in fig. 3), and discharged into the condenser 103 through the exhaust port 40 of the second-stage rotor cavity 12. After being mixed, the two paths of exhaust gas compressed in the first-stage rotor cavity 11 and the second-stage rotor cavity 12 are condensed and released in the condenser 103 together to form a normal-temperature high-pressure supercooled liquid refrigerant (the process of reference number 2/7-3 in fig. 3); then the refrigerant is cooled and depressurized by a first throttling valve 104 (the process of reference number 3-4 in FIG. 3) to form a two-phase refrigerant; after gas-liquid separation in the flash tank 105, the saturated refrigerant vapor enters the suction port 30 of the second-stage rotor cavity 12 (reference number 4-6 in fig. 3); the saturated refrigerant liquid after gas-liquid separation in the flash tank 105 is throttled again by the second throttle valve 106 and enters the evaporator 101 (the process of reference 5-8); after the low-temperature low-pressure refrigerant liquid is vaporized in the evaporator 101 and absorbs heat, low-temperature low-pressure superheated refrigerant gas is formed and flows into the suction port 10 of the first-stage rotor cavity 11 (reference number 8-1 in fig. 3), thereby forming a complete refrigeration cycle.
As shown in fig. 1, according to the screw compressor provided by the present invention, two pairs of male and female rotors 13, 14 can be arranged in various configurations, for example, the two male and female rotors can be horizontally arranged; the two male and female rotors can be vertically and longitudinally arranged. Of course the two male rotors must be mounted coaxially. That is, the two female rotors can be on the same side of the male rotor, or can be distributed on different sides of the male rotor, or on the same side or different sides of the upper and lower parts.
The platform screw compressor 102 of the invention is provided with two pairs of male and female rotors 13, 14 which are respectively positioned in two independent spaces, wherein, the pair of male and female rotors 13 compresses the superheated refrigerant gas flowing out of the evaporator 101; the other pair of the male and female rotors 14 is in another independent chamber, and compresses the saturated vapor refrigerant throttled by the flash tank 105, and the two compressed refrigerants jointly enter the condenser 103 to form a four-rotor compressor and a refrigeration system for parallel compression of air suction and air supplement. The invention can supplement air under any pressure ratio working condition, and the opening of the air supplementing hole is not limited by the structure and can be compatible and matched with the discharge capacity. And simultaneously, the problem of leakage increase after air supplement enters the middle cavity is solved. The air supplement effect is greatly increased, the refrigerating capacity is improved, and the energy efficiency ratio of the unit is improved.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The screw compressor comprises two pairs of male and female rotors and a motor for driving the two pairs of male and female rotors to rotate, and is characterized in that the two pairs of male and female rotors are respectively arranged in a first section of independent rotor cavity and a second section of independent rotor cavity, and the two pairs of male and female rotors independently suck, compress and exhaust air.
2. The screw compressor according to claim 1, wherein the male rotors of said two pairs of male and female rotors are coaxially connected and driven by said motor.
3. The screw compressor according to claim 1, wherein the first and second rotor cavities are separately manufactured and then butt-joined into a single body, and a separation between the first and second rotor cavities is sealed by a shaft seal.
4. The screw compressor according to claim 1 wherein the first and second rotor cavities are formed as an integral rotor cavity, and the inner cavity of the integral rotor cavity is sealed into two separate first and second rotor cavities by a partition.
5. The screw compressor according to claim 1 wherein the second stage rotor cavity has a suction capacity of 10% to 40% of the suction capacity of the first stage rotor cavity.
6. The screw compressor of claim 1, wherein the motor is disposed in either of the first and second rotor cavities.
7. The screw compressor according to claim 6, wherein the motor is provided between the two pairs of male and female rotors.
8. The screw compressor according to claim 6, wherein the motor is provided at the outer ends of the male and female rotors in the first or second rotor chamber section.
9. A screw refrigerating unit with a screw compressor according to any one of claims 1 to 8, comprising a condenser, an evaporator and an economizer, wherein a suction port of a first-stage rotor cavity of the screw compressor is communicated with a gas outlet of the evaporator, and a gas outlet of the first-stage rotor cavity is communicated with a gas inlet of the condenser; the suction port of the second section of the rotor cavity is communicated with the gas outlet of the economizer, the gas outlet of the second section of the rotor cavity is communicated with the gas inlet of the condenser, and the gas outlet of the economizer is communicated with the gas inlet of the evaporator.
10. The screw refrigeration unit of claim 9 wherein the economizer is a flash tank or a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111532820.1A CN114033685A (en) | 2021-12-15 | 2021-12-15 | Screw compressor and screw refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111532820.1A CN114033685A (en) | 2021-12-15 | 2021-12-15 | Screw compressor and screw refrigerating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114033685A true CN114033685A (en) | 2022-02-11 |
Family
ID=80140682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111532820.1A Pending CN114033685A (en) | 2021-12-15 | 2021-12-15 | Screw compressor and screw refrigerating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114033685A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199538A (en) * | 2022-08-04 | 2022-10-18 | 山东省章丘鼓风机股份有限公司 | Screw blower using pressure regulating hole to change internal compression ratio |
-
2021
- 2021-12-15 CN CN202111532820.1A patent/CN114033685A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199538A (en) * | 2022-08-04 | 2022-10-18 | 山东省章丘鼓风机股份有限公司 | Screw blower using pressure regulating hole to change internal compression ratio |
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