CN113217389A - Water vapor screw compressor suitable for medium-high pressure working condition - Google Patents
Water vapor screw compressor suitable for medium-high pressure working condition Download PDFInfo
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- CN113217389A CN113217389A CN202110502678.XA CN202110502678A CN113217389A CN 113217389 A CN113217389 A CN 113217389A CN 202110502678 A CN202110502678 A CN 202110502678A CN 113217389 A CN113217389 A CN 113217389A
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- end bearing
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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
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a water vapor screw compressor, which comprises a shell and a screw rotor pair; the shell comprises an air inlet end bearing seat, an air cylinder body and an air outlet end bearing seat which are sequentially connected; the screw rotor pair comprises a male rotor and a female rotor which are meshed with each other; one end of each rotor is sequentially provided with an air inlet end bearing and an air inlet end shaft seal from outside to inside, and the other end of each rotor is sequentially provided with an air outlet end bearing and an air outlet end bearing from outside to inside; it is characterized in that the gear ratio of the male rotor to the female rotor is 5: 7 or 6: 8. the invention can meet the water vapor compression requirements that the exhaust pressure is more than 1.0MPa and the exhaust temperature is more than 200 ℃.
Description
Technical Field
The invention relates to a screw compressor, in particular to a water vapor screw compressor.
Background
The existing steam screw compressor has a small pressure ratio, a product structure cannot bear high pressure resistance, is easy to deform under a high-temperature condition, can only be suitable for low-pressure and low-temperature working occasions, and cannot meet the requirement of pressurizing low-pressure steam to obtain high-pressure steam.
Disclosure of Invention
The invention aims to provide a water vapor screw compressor which can meet the water vapor compression requirements that the exhaust pressure is greater than 1.0MPa and the exhaust temperature is greater than 200 ℃.
The water vapor screw compressor applicable to the medium-high pressure working condition comprises a shell and a screw rotor pair; the shell comprises an air inlet end bearing seat, an air cylinder body and an air outlet end bearing seat which are sequentially connected; the screw rotor pair comprises a male rotor and a female rotor which are meshed with each other; one end of each rotor is sequentially provided with an air inlet end bearing and an air inlet end shaft seal from outside to inside, and the other end of each rotor is sequentially provided with an air outlet end bearing and an air outlet end bearing from outside to inside; it is characterized in that the gear ratio of the male rotor to the female rotor is 5: 7 or 6: 8.
further, the cylinder block is integrally cast with the exhaust end bearing block.
Furthermore, a T-shaped sliding block extending along the longitudinal direction of the shell and a T-shaped sliding block extending along the transverse direction of the shell are mounted on the bottom surface of the air inlet end bearing seat, and a T-shaped sliding block extending along the longitudinal direction of the shell is mounted on the bottom surface of the air outlet end bearing seat; each T-shaped sliding block comprises a transverse edge part and a vertical edge part, the transverse edge part is connected with the corresponding bearing seat, and the upper end of the vertical edge part is connected with the transverse edge part; concave bases corresponding to the T-shaped sliding blocks arranged on the air inlet end bearing block and the air outlet end bearing block one by one are arranged on the compressor supporting frame; the concave base comprises a bottom edge part and a pair of side edge parts, two ends of the bottom edge part are respectively connected with the bottoms of the pair of side edge parts, and the bottom edge part and the pair of side edge parts jointly define a concave cavity; the vertical edge part of each T-shaped sliding block extends into the concave cavity of the corresponding concave base, and the transverse edge part of each T-shaped sliding block is pressed on the top surface of a pair of side edge parts of the corresponding concave base.
Further, the surfaces of the female rotor and the male rotor are provided with a coating.
After the technical scheme is adopted, the invention at least has the following technical effects:
1. the gear ratio of the male rotor and the female rotor of the water vapor screw compressor provided by the embodiment of the invention is 5: 7 or 6: 8, the ratio of teeth compared to conventional male and female rotors is 4:6 or 5: the double-screw compressor of 6 can increase the tooth thickness and the tooth root diameter, thereby improving the rotor strength;
2. according to the steam screw compressor, the cylinder body and the exhaust end bearing seat are integrally cast and formed, so that the high pressure resistance of the shell is improved, the influence of high-temperature deformation on the shell structure is reduced, and leakage can be prevented;
3. the surface of the rotor of the water vapor screw compressor is coated with the coating, so that the processing of the rotor and the control of the meshing clearance of the rotor are facilitated;
4. the existing water vapor screw compressor is fixedly installed on a compressor supporting rack and cannot move. The steam screw compressor of this embodiment cooperates with the concave base of installing on compressor support frame through T shape slider, has kept the degree of freedom of casing axial deformation, has eliminated the influence of high temperature thermal deformation that expands.
Drawings
Fig. 1 shows an external view of a water vapor screw compressor according to an embodiment of the present invention.
Fig. 2 shows a schematic bottom view of a water vapor screw compressor according to an embodiment of the invention.
FIG. 3 shows a schematic side view of a water vapor screw compressor according to an embodiment of the invention.
Fig. 4 shows a schematic view of the internal structure of a water vapor screw compressor according to an embodiment of the present invention.
Fig. 5 shows a schematic cross-sectional view C-C of fig. 1.
Fig. 6 shows a partially enlarged schematic view of portion I of fig. 5.
FIGS. 7 and 8 show a top view and a side view, respectively, of a T-shaped slider according to an embodiment of the present invention.
Figures 9 and 10 show a top schematic view and a front schematic view, respectively, of a concave base according to an embodiment of the present invention.
Fig. 11 shows a schematic view of a first embodiment (5: 7 gear ratio) of the tooth forms of the female and male rotors of the example of the invention.
Fig. 12 shows a schematic view of a second embodiment (6: 8 gear ratio) of the tooth forms of the female and male rotors of the example of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Please refer to fig. 1 to 10. A water vapor screw compressor 100 according to an embodiment of the present invention includes a casing 1, a pair of screw rotors, and a pair of synchronizing gears 3 that mesh with each other.
The housing 1 includes an intake end cover 11, an intake end bearing block 12, a cylinder block 13, an exhaust end bearing block 14, and an exhaust end cover 15, which are connected in sequence. The air inlet side of the cylinder block 13 is connected with an air inlet end bearing block 12 through a flange, the air inlet end bearing block 12 is connected with an air inlet end cover 11 through a flange, and the air outlet side of an air outlet end bearing block 14 is connected with an air outlet end cover 15 through a flange. In the present embodiment, the cylinder block 13 is integrally cast with the exhaust end bearing block 14, so that the high pressure resistance of the casing 1 is improved, and the influence of high temperature deformation on the casing structure is reduced. A radial exhaust port, an axial exhaust port, and a radial suction port are disposed in a part of the cylinder block 13 integrally formed with the exhaust-end bearing housing 14, and an axial suction port is disposed in the intake-end bearing housing 12.
The screw rotor pair comprises a male rotor 21 and a female rotor 22 which mesh with each other. One end of each rotor is sequentially provided with an air inlet end bearing 41 and an air inlet end shaft seal 51 from outside to inside, and the other end of each rotor is sequentially provided with an air outlet end bearing 42 and an air outlet end shaft seal 52 from outside to inside. The pair of synchronizing gears 3 are mounted to the female rotor 22 and the male rotor 21, respectively, and are located outside the exhaust end shaft seal 52. The motor can be connected with the part of the male rotor extending out of the shell through the shaft coupling to drive the compressor to rotate.
Please refer to fig. 11 and 12. In the present embodiment, the gear ratio of the male rotor 21 to the female rotor 22 is 5: 7 or 6: 8, the ratio of teeth compared to conventional male and female rotors is 4:6 or 5: the double-screw compressor of 6 can increase the tooth thickness and the diameter of the tooth root, thereby improving the strength of the rotor, enabling the water vapor compressor of the embodiment of the invention to adapt to a larger pressure ratio, and meanwhile, the operation is efficient and the processing is convenient. The surfaces of the female rotor 22 and the male rotor 21 are coated with coatings, so that the meshing clearance of the rotors can be conveniently adjusted, and the operation volume efficiency is improved.
The intake end bearing 41 is an intake end radial bearing; the exhaust end bearing 42 includes an exhaust end radial bearing and an exhaust end thrust bearing (the exhaust end radial bearing and the exhaust end thrust bearing are integrally designed in the example of fig. 4). The bearing operation needs lubricating oil, and therefore the bearing seat is provided with a lubricating oil hole.
In the present embodiment, the intake-end radial bearing and the exhaust-end radial bearing are both sliding bearings. The radial bearing at the air inlet end and the radial bearing at the air outlet end are all four-oil-blade radial bush bearings; the exhaust end thrust bearing is a tilting pad thrust bearing, so that the exhaust end thrust bearing has stronger load resistance.
In this embodiment, the inlet end shaft seal 51 and the outlet end shaft seal 52 are either aspirating carbon ring seals or double-ended dry gas seals. Specifically, the inlet-end shaft seal 51 and the outlet-end shaft seal 52 are sealed by injecting superheated steam into the sealing surface and matching with a suction carbon ring seal, or by matching the suction of the sealing surface and the dry seal of the double-end surface. The shaft seal adopts the sealed face to annotate superheated steam cooperation bleeder carbocycle and seals, and its adaptation temperature is high, and is nontoxic harmless, reveals gas recycle. If the sealing surface is used for air exhaust to match with the double-end-surface dry gas seal, the air exhaust reduces the sealing difficulty and can improve the reliability. Each bearing seat is provided with an air hole and an oil hole for sealing. In order to reduce the pressure of the sealing side, a balance hole is also formed in the bearing seat at the exhaust end and is used for connecting the pressure before the sealing of the exhaust side and the air inlet pressure.
In this embodiment, the steam screw compressor comprises two pairs of support legs 6, and each pair of support legs 6 is located on two sides of the housing 1. The upper ends of one pair of supporting legs 6 are respectively connected with the positions of the two sides of the air inlet end bearing seat 12 close to the midsplit section of the air inlet end bearing seat 12 (the position of the midsplit section is shown as the horizontal line X in figure 3, and the central axes of the female rotor and the male rotor are positioned on the midsplit section), and the upper ends of the other pair of supporting legs 6 are respectively connected with the positions of the two sides of the air outlet end bearing seat 14 close to the midsplit section of the air outlet end bearing seat 14, and the connection modes include but are not limited to integral casting, welding, bolt connection and the like. The supporting legs are arranged at the positions, so that the influence of thermal deformation on the shell can be reduced.
In the present embodiment, a T-shaped slider 7 extending in the longitudinal direction of the housing 1 (i.e., the axial direction of the female and male rotors) and two T-shaped sliders 7 extending in the transverse direction of the housing 1 are mounted on the bottom surface of the intake end bearing housing 12, and a T-shaped slider 7 extending in the longitudinal direction of the housing is mounted on the bottom surface of the exhaust end bearing housing 14.
Each T-shaped sliding block 7 comprises a transverse edge part 71 and a vertical edge part 72, and a plurality of first through holes 711 for bolts to pass through are formed in the transverse edge part 71 and are connected with corresponding bearing seats through bolts; the upper end of the vertical side portion 72 is connected to the horizontal side portion 71.
The vertical edge 72 of each T-shaped slider 7 extends into the cavity 83 of the corresponding concave base 8, the lateral edge 71 of each T-shaped slider 7 presses on the top surface of a pair of lateral edges 82 of the corresponding concave base 8, and the pair of lateral edges 82 function as a guide rail.
The existing water vapor screw compressor is fixedly installed on a compressor supporting rack and cannot move. The steam screw compressor of this embodiment cooperates with the concave base 8 installed on the compressor support frame through the T-shaped slider 7, has kept the degree of freedom that the casing warp, has eliminated the influence of high temperature thermal deformation that expands. The degree of freedom of deformation of the exhaust end bearing housing 14 in the lateral direction of the housing is limited, and can function as a positioning reference.
The steam screw compressor of the embodiment can be used in the field of steam pressurization under medium-high pressure working conditions (1.0-3.0 MPa), namely, low-pressure gaseous steam is pressurized through electric power to obtain high-pressure steam. Specific fields of application include, but are not limited to, the following industrial sites: the system comprises the fields of water vapor pressurization conveying, a water vapor closed cycle heat pump system, an MVR (mechanical vapor recompression) technology, seawater desalination, sewage treatment, chemical rectification, waste heat utilization and the like, wherein the technology is applied to the fields.
Claims (10)
1. A water vapor screw compressor suitable for medium-high pressure working conditions comprises a shell and a screw rotor pair; the shell comprises an air inlet end bearing seat, an air cylinder body and an air outlet end bearing seat which are sequentially connected; the screw rotor pair comprises a male rotor and a female rotor which are meshed with each other; one end of each rotor is sequentially provided with an air inlet end bearing and an air inlet end shaft seal from outside to inside, and the other end of each rotor is sequentially provided with an air outlet end bearing and an air outlet end bearing from outside to inside; characterized in that the ratio of the number of teeth of the male rotor to the number of teeth of the female rotor is 5: 7 or 6: 8.
2. the steam screw compressor of claim 1, wherein the cylinder block is cast integrally with the discharge end bearing block.
3. The water vapor screw compressor of claim 1 or 2, wherein the bottom surface of the intake end bearing housing is mounted with a T-shaped slider extending in the longitudinal direction of the casing and a T-shaped slider extending in the transverse direction of the casing, and the bottom surface of the exhaust end bearing housing is mounted with a T-shaped slider extending in the longitudinal direction of the casing; each T-shaped sliding block comprises a transverse edge part and a vertical edge part, the transverse edge part is connected with the corresponding bearing seat, and the upper end of the vertical edge part is connected with the transverse edge part;
concave bases corresponding to the T-shaped sliding blocks arranged on the air inlet end bearing block and the air outlet end bearing block one by one are arranged on the compressor supporting frame; the concave base comprises a bottom edge part and a pair of side edge parts, two ends of the bottom edge part are respectively connected with the bottoms of the pair of side edge parts, and the bottom edge part and the pair of side edge parts jointly define a concave cavity;
the vertical edge part of each T-shaped sliding block extends into the concave cavity of the corresponding concave base, and the transverse edge part of each T-shaped sliding block is pressed on the top surface of a pair of side edge parts of the corresponding concave base.
4. The steam screw compressor of claim 3, wherein the bottom surface of the inlet end bearing block is provided with a T-shaped slider extending in the longitudinal direction of the casing and two T-shaped sliders extending in the transverse direction of the casing, and the bottom surface of the outlet end bearing block is provided with a T-shaped slider extending in the longitudinal direction of the casing.
5. The steam screw compressor according to claim 1 or 2, comprising two pairs of support feet, each pair being located on either side of the housing;
the upper ends of one pair of supporting legs are respectively connected with the positions of the two sides of the air inlet end bearing seat close to the bisection plane of the air inlet end bearing seat, and the upper ends of the other pair of supporting legs are respectively connected with the positions of the two sides of the exhaust end bearing seat close to the bisection plane of the exhaust end bearing seat.
6. The water vapor screw compressor of claim 1, wherein the inlet end bearing is an inlet end radial bearing; the exhaust end bearing comprises an exhaust end radial bearing and an exhaust end thrust bearing.
7. The water vapor screw compressor of claim 6, wherein the inlet end radial bearing and the outlet end radial bearing are both plain bearings.
8. The water vapor screw compressor of claim 6, wherein the inlet end radial bearing and the outlet end radial bearing are both four-lobe radial pad bearings;
and the exhaust end thrust bearing is a tilting pad thrust bearing.
9. The steam screw compressor of claim 1, wherein the inlet end shaft seal and the exhaust end shaft seal are extraction carbon ring seals or double end face dry gas seals.
10. The water vapor screw compressor of claim 1, wherein surfaces of the female rotor and the male rotor are provided with a coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110502678.XA CN113217389A (en) | 2021-05-09 | 2021-05-09 | Water vapor screw compressor suitable for medium-high pressure working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110502678.XA CN113217389A (en) | 2021-05-09 | 2021-05-09 | Water vapor screw compressor suitable for medium-high pressure working condition |
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| Publication Number | Publication Date |
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| CN113217389A true CN113217389A (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110502678.XA Pending CN113217389A (en) | 2021-05-09 | 2021-05-09 | Water vapor screw compressor suitable for medium-high pressure working condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915127A (en) * | 2021-11-23 | 2022-01-11 | 西漠能源技术（苏州）有限公司 | Low-temperature screw steam compressor |
-
2021
- 2021-05-09 CN CN202110502678.XA patent/CN113217389A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915127A (en) * | 2021-11-23 | 2022-01-11 | 西漠能源技术（苏州）有限公司 | Low-temperature screw steam compressor |
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