CN111852858A - Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio - Google Patents
Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio Download PDFInfo
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- CN111852858A CN111852858A CN202010736098.2A CN202010736098A CN111852858A CN 111852858 A CN111852858 A CN 111852858A CN 202010736098 A CN202010736098 A CN 202010736098A CN 111852858 A CN111852858 A CN 111852858A
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- exhaust
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- screw compressor
- volume ratio
- internal volume
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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
- 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
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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
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
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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 an internal volume ratio adjusting mechanism and a screw compressor with the adjustable internal volume ratio, which comprise a screw compressor body, a suction end seat, a suction cavity, a rotor, a slide valve, an exhaust end seat, a radial exhaust port, a plug valve, a jacket exhaust cavity and an exhaust pipe, wherein the screw compressor body is provided with the radial exhaust port; the radial exhaust port is communicated with the jacket exhaust cavity, and the tail end of the jacket exhaust cavity is connected with an exhaust pipe. A radial exhaust port and a jacket exhaust cavity are arranged at a certain position of the machine body close to the exhaust end seat, and the opening and closing of the radial exhaust port are controlled through a plug valve. When the plug valve is opened, the gas discharged by the plug valve is discharged out of the compressor through a jacket exhaust cavity of the machine body and directly enters the oil separator through an inlet of the oil separator. That is, according to the change situation of the environmental temperature, when the environmental temperature is greatly lower than the designed highest environmental temperature, the opening of the plug valve is controlled to adjust the internal volume ratio, and the reduction of the final exhaust pressure is realized.
Description
Technical Field
The invention relates to the technical field of refrigeration compressors, in particular to an internal volume ratio adjusting mechanism and a screw compressor with an adjustable internal volume ratio.
Background
When the double-screw compressor works, the gas in the tooth space is compressed by the tooth space volume along with the rotation of the rotor until the working volume is communicated with the edge of the exhaust port, and the process is called an internal compression process. When the compression process is finished and the exhaust process is just started, the gas pressure in the working volume is suddenly reduced or increased due to the fact that the exhaust pressure and the compression finish pressure are not equal under certain working conditions, and constant volume expansion or constant volume compression is generated. Therefore, the compression end pressure in the screw type refrigeration compressor is not necessarily equal to the pressure in the discharge chamber (back pressure). The over-compression is called when the pressure at the end of compression is greater than the pressure in the discharge chamber, in which case the gas is compressed in the working volume from the suction pressure to the pressure at the end of compression, expanded from the pressure at the end of compression to the discharge pressure, and then subjected to the discharge process. When the pressure at the end of compression is less than the pressure of the exhaust cavity, the compression is called under-compression, the gas is compressed from the suction pressure to the pressure at the end of compression in the working volume, the working volume is communicated with the exhaust hole, the gas in the exhaust pipe flows backwards, the gas is compressed from the pressure at the end of compression to the exhaust pressure at a constant volume, and then the exhaust is carried out. The thermal losses of the compressor are accompanied by the flow losses of the gas and the increase of the periodic exhaust noise, both in the case of over-compression and under-compression, and at the same time the power losses of the compressor are increased. Screw compressor manufacturers in China propose compressors with different internal volume ratios for selection according to the requirements of the application working conditions of the compressors. However, for a unit with a large working condition change range, such as summer working conditions, the ambient temperature is high, and the condensation pressure and the condensation temperature of the screw compressor unit are high; the environment temperature in spring, autumn and winter is lower, which easily causes the unequal ratio of the internal pressure and the external pressure of the screw type refrigeration compressor, namely, causes the phenomena of over compression and under compression, and causes the extra power consumption of the compressor. To this end, the present invention discloses a screw compressor adjustable in a content ratio according to seasonal variations.
Disclosure of Invention
The invention aims to provide an internal volume ratio adjusting mechanism and a screw compressor with the adjustable internal volume ratio, which are used for solving the problems in the prior art, can adjust the balance of the internal pressure ratio and the external pressure ratio of the screw compressor, reduce extra power consumption and improve the working efficiency of a unit.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an internal volume ratio adjusting mechanism which comprises a radial exhaust port, a plug valve, a jacket exhaust cavity and an exhaust pipe, wherein the radial exhaust port is formed in the position, close to an exhaust end seat, on a machine body of a screw compressor; the screw compressor body is provided with the jacket exhaust cavity communicated with the radial exhaust port, and the tail end of the jacket exhaust cavity is connected with the exhaust pipe.
Preferably, the position of the radial exhaust port is determined according to the condensation pressure corresponding to the average daily temperature of the winter environment where the screw compressor is used.
Preferably, the condensing pressure and the condensing temperature of the screw compressor are calculated according to the daily average temperature of the environment where the screw compressor is used in winter, so that the effective working length of the screw corresponding to the condensing pressure is determined when the screw compressor is in a 100% capacity load working condition, and the radial position of the screw compressor corresponding to the effective working length of the screw is the position of the radial exhaust port.
Preferably, the vent pipe communicates with an inlet of an oil separator.
The invention also provides a screw compressor with adjustable internal volume ratio, which comprises the internal volume ratio adjusting mechanism, and further comprises a suction end seat, a suction cavity, a rotor, a slide valve and an exhaust end seat which are arranged on the body of the screw compressor, wherein the suction end seat is arranged on one side of the body, one end of the suction cavity in the suction end seat is a suction port, and the other end of the suction cavity is communicated with a working cavity in the body; the rotor and the slide valve are arranged in an internal working cavity of the machine body, the exhaust end seat is arranged on the other side of the machine body, one end of an exhaust cavity of the exhaust end seat is communicated with the working cavity, and the other end of the exhaust cavity of the exhaust end seat is connected with an inlet of the oil separator; under the working condition of summer ambient temperature, the internal volume ratio adjusting mechanism does not work, the radial exhaust port is in a closed state, and refrigerant gas compressed by the compressor enters the oil separator through the exhaust cavity; under the condition that the internal pressure ratio and the external pressure ratio of the compressor are unequal, the internal volume ratio adjusting mechanism is in a working state, the radial exhaust port is opened, and at the moment, compressed refrigerant gas enters the oil separator after passing through the jacket exhaust cavity and the exhaust pipe.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) according to the internal volume ratio adjusting mechanism, the radial exhaust hole is formed in the machine body, the arrangement position of the radial exhaust hole is determined according to the daily average temperature of the local winter environment, the internal and external pressure ratio is equal, the performance coefficient of the screw compressor is improved, and the energy conservation of the screw compressor is realized.
(2) The opening and closing of the radial exhaust hole are controlled through the plug valve, and the operation is simple, convenient and easy to realize. Meanwhile, compared with the existing screw compressor, the appearance structure of the screw compressor is slightly changed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a structural composition diagram of a screw compressor with an adjustable internal volume ratio;
FIG. 2 is a sectional view of a screw compressor with an adjustable internal volume ratio;
wherein, 1, an air suction end seat; 2. an air suction cavity; 3. a body; 4. a rotor; 5. an exhaust end seat; 6. a spool valve; 7. an exhaust chamber; 8. a radial exhaust port; 9. a plug valve; 10. a jacket exhaust cavity; 11. and (4) exhausting the gas.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an internal volume ratio adjusting mechanism and a screw compressor with the adjustable internal volume ratio, which are used for solving the problems in the prior art, can adjust the balance of the internal pressure ratio and the external pressure ratio of the screw compressor, reduce extra power consumption and improve the working efficiency of a unit.
A radial exhaust port and a jacket exhaust cavity are arranged at a certain position of the machine body close to the exhaust end seat, and the opening and closing of the radial exhaust port are controlled through a plug valve. When the plug valve is opened, the gas discharged by the plug valve is discharged out of the compressor through a jacket exhaust cavity of the machine body and directly enters the oil separator through an inlet of the oil separator. The inner pressure ratio is adjusted by controlling the opening and closing of the plug valve according to the change condition of the environmental temperature, so that the inner pressure ratio is equal to the outer pressure ratio.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-2, the present embodiment provides an internal volume ratio adjusting mechanism, which includes a radial exhaust port 8, a plug valve 9, a jacket exhaust cavity 10, and an exhaust pipe 11, where the radial exhaust port 8 is disposed on a body 3 of a screw compressor near an exhaust end seat 5, and the plug valve 9 is disposed at the radial exhaust port 8 and is used for controlling opening and closing of the radial exhaust port 8; the body 3 of the screw compressor is provided with a jacket exhaust cavity 10 communicated with the radial exhaust port 8, and the tail end of the jacket exhaust cavity 10 is connected with an exhaust pipe 11.
A radial exhaust port 8 and a jacket exhaust cavity 10 are arranged on a machine body 3 of the screw compressor, and the opening and closing are controlled through a plug valve 9. The radial exhaust port 8 location is determined primarily by the local winter ambient daily average temperature. And calculating the condensation pressure and the condensation temperature of the screw compressor according to the daily average temperature of the local winter environment. Therefore, when the screw compressor is in a 100% capacity load working condition, the effective working length of the screw corresponding to the condensing pressure is determined, and the point is the position point of the radial exhaust port. A jacket exhaust cavity 10 is arranged on the machine body between the radial exhaust port 8 and the exhaust end seat 5 of the screw compressor. An exhaust pipe 11 is arranged at the end part of the jacket layer and is directly connected with an inlet of the oil separator. Refrigerant gas discharged radially through the plug valve 9 enters the oil separator through the body jacket discharge chamber 10 and the discharge pipe 11.
The invention also provides a screw compressor with adjustable internal volume ratio, which comprises the internal volume ratio adjusting mechanism, and further comprises a suction end seat 1, a suction cavity 2, a rotor 4, a slide valve 6 and an exhaust end seat 5 which are arranged on a machine body of the screw compressor, wherein the suction end seat 1 is arranged on one side of the machine body 3, one end of the suction cavity 2 in the suction end seat 1 is a suction port, and the other end of the suction cavity is communicated with a working cavity in the machine body 3; the rotor 4 and the slide valve 6 are arranged in an internal working cavity of the machine body 3, the other side of the machine body 3 is provided with an exhaust end seat 5, one end of an exhaust cavity 7 of the exhaust end seat 5 is communicated with the working cavity, and the other end of the exhaust cavity is connected with an inlet of the oil separator; under the working condition of summer ambient temperature, the internal volume ratio adjusting mechanism does not work, the radial exhaust port 8 is in a closed state, and gas compressed by the compressor enters the oil separator through the exhaust cavity 7; when the internal and external pressure ratios of the compressor are unequal (in spring, autumn or winter), the internal volume ratio adjusting mechanism is in a working state, the radial exhaust port 8 is opened, and at the moment, compressed air enters the oil separator through the jacket exhaust chamber 10 and the exhaust pipe 11.
The invention focuses on the adjustment of the compression end pressure of the screw compressor, and in the normal working state of the compressor, low-temperature and low-pressure refrigerant gas is sucked into the compressor from a suction end seat 1 and a suction cavity 2 of the compressor, then is compressed into high-temperature and high-pressure gas in a closed space formed by a rotor 4, a slide valve 6 and a machine body 3, and enters an oil separator through an exhaust end seat 5 and an exhaust pipe 7. The magnitude of the pressure at the end of the compression depends only on the structural configuration of the compressor. Under the working condition of the ambient temperature in summer, the condensing pressure of the screw compressor can reach 1.3MPa, and under the ambient temperature in winter, the condensing pressure is about 0.8MPa, so that the pressure ratio between the inside and the outside of the compressor is unequal, and the additional power consumption and the energy waste of the compressor are caused. The screw compressor of the invention is provided with a radial exhaust port 8 at a certain position of the machine body 3 close to the exhaust end seat 5, and the opening and closing of an orifice are controlled by a plug valve 9. After the plug valve 9 is opened, the gas discharged through the plug valve 9 is discharged out of the compressor through the jacket exhaust cavity 10 of the machine body 3, and directly enters the inlet of the oil separator through the exhaust pipe 11 to enter the oil separator.
The radial exhaust port 8 location is determined primarily by the local winter ambient daily average temperature. And calculating the condensation pressure and the condensation temperature of the screw compressor according to the daily average temperature of the local winter environment. Therefore, when the screw compressor is in a 100% capacity load working condition, the effective working length of the screw corresponding to the condensing pressure is determined, and the point is the position point of the radial exhaust port. For example, when an ammonia screw compressor is designed, the condensing pressure of the ammonia screw compressor can reach 1.55MPa under the working condition that the ambient temperature is 35 ℃ in summer, the internal volume ratio of the screw compressor is a certain value, and the internal pressure ratio and the external pressure ratio are equal. And under the temperature of 10 ℃ in winter environment, the condensation pressure is 0.75MPa, and the radial exhaust port can be arranged at the position where the screw is compressed to 0.95 MPa. The plug valve 9 is opened, and a part of gas with the pressure of 0.95MPa directly passes through the jacket exhaust cavity 10 of the machine body 3 and is exhausted out of the compressor, and directly enters the inlet of the oil separator through the exhaust pipe 11 and enters the oil separator, so that the efficiency of the screw compressor is improved, and the energy consumption of the screw compressor is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. An internal volume ratio adjustment mechanism, characterized in that: the screw compressor comprises a radial exhaust port, a plug valve, a jacket exhaust cavity and an exhaust pipe, wherein the radial exhaust port is formed in the position, close to an exhaust end seat, of a machine body of the screw compressor, and the plug valve is arranged at the radial exhaust port and used for controlling the opening and closing of the radial exhaust port; the screw compressor body is provided with the jacket exhaust cavity communicated with the radial exhaust port, and the tail end of the jacket exhaust cavity is connected with the exhaust pipe.
2. The internal volume ratio adjustment mechanism according to claim 1, wherein: the position of the radial exhaust port is determined according to the condensation pressure corresponding to the average daily temperature of the winter environment where the screw compressor is used.
3. The internal volume ratio adjustment mechanism according to claim 2, wherein: and calculating the condensation pressure and the condensation temperature of the screw compressor according to the daily average temperature of the environment where the screw compressor is used in winter, so that the effective working length of the screw corresponding to the condensation pressure is determined when the screw compressor is in a 100% capacity load working condition, and the radial position of the screw compressor corresponding to the effective working length of the screw is the position setting position of the radial exhaust port.
4. The internal volume ratio adjustment mechanism according to claim 1, wherein: the exhaust pipe is communicated with the inlet of the oil separator.
5. A screw compressor having an adjustable internal volume ratio, comprising the internal volume ratio adjusting mechanism according to any one of claims 1 to 4, characterized in that: the screw compressor further comprises a suction end seat, a suction cavity, a rotor, a slide valve and an exhaust end seat which are arranged on a machine body of the screw compressor, wherein the suction end seat is arranged on one side of the machine body, one end of the suction cavity in the suction end seat is a suction port, and the other end of the suction cavity is communicated with a working cavity in the machine body; the rotor and the slide valve are arranged in an internal working cavity of the machine body, the exhaust end seat is arranged on the other side of the machine body, one end of an exhaust cavity of the exhaust end seat is communicated with the working cavity, and the other end of the exhaust cavity of the exhaust end seat is connected with an inlet of the oil separator; under the working condition of summer ambient temperature, the internal volume ratio adjusting mechanism does not work, the radial exhaust port is in a closed state, and refrigerant gas compressed by the compressor enters the oil separator through the exhaust cavity; under the condition that the internal pressure ratio and the external pressure ratio of the compressor are unequal, the internal volume ratio adjusting mechanism is in a working state, the radial exhaust port is opened, and at the moment, compressed refrigerant gas enters the oil separator after passing through the jacket exhaust cavity and the exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736098.2A CN111852858A (en) | 2020-07-28 | 2020-07-28 | Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736098.2A CN111852858A (en) | 2020-07-28 | 2020-07-28 | Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio |
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| Publication Number | Publication Date |
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| CN111852858A true CN111852858A (en) | 2020-10-30 |
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| CN202010736098.2A Pending CN111852858A (en) | 2020-07-28 | 2020-07-28 | Internal volume ratio adjusting mechanism and screw compressor with adjustable internal volume ratio |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352523A (en) * | 2022-02-15 | 2022-04-15 | 珠海格力电器股份有限公司 | Screw compressor, control method thereof and air conditioning equipment |
| CN114688024A (en) * | 2022-03-09 | 2022-07-01 | 江森自控空调冷冻设备(无锡)有限公司 | Screw compressor |
| CN114738276A (en) * | 2022-05-07 | 2022-07-12 | 浙江巨能压缩机有限公司 | Double-rotor compressor |
| 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 |
-
2020
- 2020-07-28 CN CN202010736098.2A patent/CN111852858A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352523A (en) * | 2022-02-15 | 2022-04-15 | 珠海格力电器股份有限公司 | Screw compressor, control method thereof and air conditioning equipment |
| CN114688024A (en) * | 2022-03-09 | 2022-07-01 | 江森自控空调冷冻设备(无锡)有限公司 | Screw compressor |
| CN114688024B (en) * | 2022-03-09 | 2024-04-05 | 江森自控空调冷冻设备(无锡)有限公司 | Screw compressor |
| CN114738276A (en) * | 2022-05-07 | 2022-07-12 | 浙江巨能压缩机有限公司 | Double-rotor compressor |
| CN114738276B (en) * | 2022-05-07 | 2023-11-21 | 浙江巨能压缩机有限公司 | Double-rotor compressor |
| 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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