CN112196791A - Energy-saving plug valve and screw compressor comprising same - Google Patents
Energy-saving plug valve and screw compressor comprising same Download PDFInfo
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- CN112196791A CN112196791A CN202011062302.3A CN202011062302A CN112196791A CN 112196791 A CN112196791 A CN 112196791A CN 202011062302 A CN202011062302 A CN 202011062302A CN 112196791 A CN112196791 A CN 112196791A
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- cavity
- screw compressor
- valve body
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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
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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
- F04C29/04—Heating; Cooling; Heat insulation
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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
Abstract
The invention discloses an energy-saving plug valve and a screw compressor containing the same, wherein the energy-saving plug valve comprises a valve cover, a valve body and a valve core, wherein an exhaust pipe is arranged on the valve cover; the valve core is arranged in the valve body and consists of an upper disc and a lower cone which are integrally connected, the lower cone is of an inverted cone frustum structure, and the top of the upper disc is connected with the valve cover through a spring; the bottom of the lower cone is assembled in a cone-shaped hole on the screw compressor body. The upper surface of a disc of the plug valve core is subjected to the pressure (condensing pressure) of refrigerant in the condenser and the downward elastic force of a spring, and the lower surface of the disc is subjected to the pressure of compressed gas at the position of the compressor and the upward elastic force of the spring; the disc is opened and closed under the action of the upper and lower pressure difference, the opening and closing of the radial exhaust hole are controlled through the plug column valve, the balance of the internal and external pressure ratio of the screw compressor can be adjusted, the extra power consumption is reduced, and the working efficiency of the unit is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration compressors, in particular to an energy-saving plug valve and a screw compressor with the same.
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 an energy saving plug valve of a screw compressor adjustable according to a content ratio of seasonal variation.
Disclosure of Invention
The invention aims to provide an energy-saving plug valve and a screw compressor comprising the same, so as to solve the problems in the prior art, adjust the balance of the internal and 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 energy-saving plug valve which comprises a valve cover, a valve body and a valve core, wherein an exhaust pipe is arranged on the valve cover, the valve body is a cylindrical cavity, the valve cover is connected to the top of the valve body in a sealing manner, and the bottom of the valve body is arranged on a screw compressor body; the valve core is arranged in the valve body and consists of an upper disc and a lower cone which are integrally connected, the lower cone is of an inverted cone frustum structure, and the top of the upper disc is connected with the valve cover through a spring; the bottom of the lower cone is assembled in a cone-shaped hole on the screw compressor body.
Preferably, the exhaust pipe on the valve cover is used for exhausting gas of the plug valve core to the oil separator; the valve cover is connected with and fixed on the valve body through the threaded hole on the threaded hole and the valve body, and a closed cavity is formed between the valve cover and the valve body.
Preferably, two positioning blocks are symmetrically arranged on two sides of the inner wall of the valve body and are used for being matched with an upper disc of the valve core, so that the valve core vertically moves up and down in the valve body; meanwhile, two positioning pins are arranged on the inner wall of the valve body at equal intervals with the two positioning blocks and used for being matched with the positioning grooves of the valve core, so that the valve core can not rotate by an angle when vertically moving up and down in the valve body.
Preferably, the bottom of the inner cavity of the valve body is provided with a circular sealing convex ring, a sealing line is arranged on the top surface of the sealing convex ring, and the upper disc abuts against the sealing line of the sealing convex ring; the bottom of the inner cavity of the valve body is positioned on the inner side of the sealing convex ring, 4 grooves are uniformly distributed, and springs are placed in the grooves.
Preferably, a sealing ring is arranged between the bottom of the valve body and the screw compressor body.
The invention also provides a screw compressor containing the energy-saving plug valve, which comprises the energy-saving plug valve, and further comprises a suction end seat, a suction cavity, a rotor, a slide valve, an exhaust end seat and an internal volume ratio adjusting mechanism 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 of the screw compressor, 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;
the internal volume ratio adjusting mechanism comprises a radial exhaust port and a jacket exhaust cavity, the radial exhaust port is formed in the position, close to the exhaust end seat, of the machine body of the screw compressor, and an energy-saving plug valve is arranged at the radial exhaust port and used for controlling the opening and closing of the radial exhaust port; the machine body of the screw compressor is provided with a jacket exhaust cavity communicated with the radial exhaust port, and the tail end of the jacket exhaust cavity is connected with an exhaust pipe;
under the working condition that the internal pressure and the external pressure of the compressor are equal, the internal volume ratio adjusting mechanism does not work, the energy-saving plug valve controls the radial exhaust port to be 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 energy-saving plug valve controls the radial exhaust port to be 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:
according to the energy-saving plug valve and the screw compressor comprising the same, the upper surface of a disc of a plug valve core is subjected to the pressure (condensing pressure) of a refrigerant in a condenser and the downward elastic force of a spring, and the lower surface of the disc is subjected to the pressure of compressed gas at the position of the compressor and the upward elastic force of the spring; the disc is opened and closed under the action of the upper and lower pressure difference, the opening and closing of the radial exhaust hole are controlled by the plug valve, and the operation is simple, convenient and easy to realize. Meanwhile, the balance of the internal and external pressure ratios of the screw compressor can be adjusted, the extra power consumption is reduced, and the working efficiency of the unit is improved.
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 an energy-saving plug valve;
FIG. 2 is a view taken along line A-A of FIG. 1;
FIG. 3 is a structural component view of the screw compressor;
FIG. 4 is a cross-sectional view of the screw compressor;
wherein, 1, an air suction end seat; 2, an air suction cavity; 3, a machine body; 4, a rotor; 5, an exhaust end seat; 6, a slide valve; 7 an exhaust cavity; 8 radial exhaust ports;
9, an energy-saving plug valve; 9-1 exhausting pipe; 9-2 of a valve body; 9-2-1 positioning blocks; 9-2-2 locating pins; 9-2-3 sealing convex ring; 9-2-4 threaded holes; 9-2-5 threaded holes; 9-2-6 grooves; 9-3 valve covers; 9-3-1 threaded hole; 9-4 valve core; 9-4-1 disc; 9-4-2 positioning grooves; 9-5 springs; 9-6 sealing the wire; 9-7 screw compressor body; 9-7-1 threaded hole; 9-8 sealing rings; 9-9 springs;
10 jacket exhaust chamber; 11 an exhaust pipe.
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 energy-saving plug valve and a screw compressor comprising the same, so as to solve the problems in the prior art, adjust the balance of the internal and external pressure ratio of the screw compressor, reduce extra power consumption and improve the working efficiency of a unit.
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 to 4, the present embodiment provides an energy saving plug valve and a screw compressor including the same, wherein the energy saving plug valve mainly includes: 9-1 part of an exhaust pipe, 9-2 parts of a valve body, 9-2-1 parts of a positioning block, 9-2-2 parts of a positioning pin, 9-2-3 parts of a sealing convex ring, 9-2-4 parts of a threaded hole, 9-2-5 parts of a threaded hole, 9-2-6 parts of a groove, 9-3 parts of a valve cover, 9-3-1 parts of a threaded hole, 9-4 parts of a valve core, 9-4-1 parts of a disc, 9-4-2 parts of a positioning groove, 9-5 parts of a spring, 9-6 parts of a sealing line, 9-7 parts of a screw compressor body, 9-7-1 parts of a threaded hole.
An exhaust pipe 9-1 is arranged on the valve cover 9-3, the exhaust pipe 9-1 exhausts the gas of the valve core 9-4 to the oil separator, and the valve cover 9-3 is connected to the valve body 9-2 through a threaded hole 9-3-1 and a threaded hole 9-2-2 on the valve body 9-2 to form a closed cavity.
The valve body 9-2 is a cylindrical cavity and is internally provided with a positioning block 9-2-1, a positioning pin 9-2-2 and a sealing convex ring 9-2-3; a threaded hole 9-2-4, a threaded hole 9-2-5 and a groove 9-2-6. The valve body 9-2 is connected to the screw compressor body 9-7 through a threaded hole 9-2-4 and a threaded hole 9-7-1. 2 evenly distributed positioning blocks 9-2-1 are arranged in the valve body 9-2 and are mainly matched with a disc 9-4-1 of the valve core 9-4, so that the valve core 9-4 is guaranteed to vertically move up and down in the valve body 9-2; meanwhile, the positioning pins 9-2-2 are arranged on 2 positioning blocks 9-2-1 at 180 degrees in the valve body 9-2 and are mainly matched with the positioning grooves 9-4-2 of the valve core 9-4, so that the valve core 9-4 is guaranteed to be incapable of rotating by an angle while vertically moving up and down in the valve body 9-2, and the cambered surface of the conical end face of the valve core 9-4 is guaranteed to be perfectly matched with the cambered surface of the inner wall of the machine body. The valve body 9-2 is provided with 4 uniformly distributed grooves 9-2-6, and springs 9-9 are placed in the grooves 9-2-6. The plug valve body is provided with a circular sealing convex ring 9-2-3, and a sealing line 9-6 is arranged on the sealing convex ring.
The top of the valve core 9-4 is provided with a disc 9-4-1, and the lower part is provided with a cone. The valve core 9-4 comprises a plug valve core disc at the top, and the upper surface of the disc 9-4-1 is subjected to the pressure (condensing pressure) of the refrigerant in the condenser and the downward elastic force of a spring 9-5; the lower side of the disk 9-4-1 is subjected to the pressure of compressed gas at the position of the compressor and the upward elastic force of the spring 9-9; the disc 9-4-1 is matched with a sealing convex ring 9-2-3 of the valve body 9-2 to form a circle of sealing line to play a role in sealing, and the disc 9-4-1 is opened and closed under the action of the upper and lower pressure difference. The spring 9-9 provides upward elastic force, and also plays a role in buffering when the valve core 9-4 moves downwards to be attached to the sealing convex ring 9-2-3, so that the impact on the sealing line 9-6 is reduced.
2 positioning grooves 9-4-2 forming 180 degrees are arranged at the end part of the disc, and the angles and the positions of the arranged positioning grooves 9-4-2 are determined according to the angles of positioning pins 9-2-2 arranged on 2 positioning blocks 9-2-1 at 180 degrees; the positioning groove 9-4-2 is matched with the positioning pin 9-2-2 of the valve body 9-2, the positioning pin 9-2-2 is relatively static, the positioning groove 9-4-2 vertically moves up and down without inclination under the matching of the positioning pin 9-2-2, and the movement angle of the valve core 9-4 is changed.
The screw compressor body 9-7 is provided with a conical hole which is matched with the conical surface at the lower part of the valve core 9-4. Meanwhile, a sealing ring 9-8 is arranged between the valve body 9-2 and the screw compressor body 9-7 to seal the body and the plug valve body.
The screw compressor with the energy-saving plug valve comprises the energy-saving plug valve, and further comprises a suction end seat 1, a suction cavity 2, a rotor 4, a slide valve 6, an exhaust end seat 5 and an internal volume ratio adjusting mechanism 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; the internal volume ratio adjusting mechanism comprises a radial exhaust port 8, an energy-saving plug valve 9, a jacket exhaust cavity 10 and an exhaust pipe 11, wherein the radial exhaust port 8 is formed in the position, close to the exhaust end seat 5, on the machine body 3 of the screw compressor, and the energy-saving plug valve 9 is arranged at the radial exhaust port 8 and used for controlling the 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 machine body 3 of the screw compressor is provided with a radial exhaust port 8 and a jacket exhaust cavity 10, and the opening and closing are controlled by an energy-saving 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 energy-saving plug valve 9 enters the oil separator through a machine body jacket exhaust cavity 10 and an exhaust pipe 11. 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 the orifice are controlled by an energy-saving plug valve 9. After the energy-saving plug and column valve 9 is opened, the gas discharged through the energy-saving plug and column 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 energy-saving 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 (6)
1. An energy-saving plug valve is characterized in that: the valve comprises a valve cover, a valve body and a valve core, wherein an exhaust pipe is arranged on the valve cover, the valve body is a cylindrical cavity, the valve cover is connected to the top of the valve body in a sealing manner, and the bottom of the valve body is arranged on a screw compressor body; the valve core is arranged in the valve body and consists of an upper disc and a lower cone which are integrally connected, the lower cone is of an inverted cone frustum structure, and the top of the upper disc is connected with the valve cover through a spring; the bottom of the lower cone is assembled in a cone-shaped hole on the screw compressor body.
2. The energy saving plug valve of claim 1, wherein: the exhaust pipe on the valve cover is used for exhausting gas of the plug valve core to the oil separator; the valve cover is connected with and fixed on the valve body through the threaded hole on the threaded hole and the valve body, and a closed cavity is formed between the valve cover and the valve body.
3. The energy saving plug valve of claim 1, wherein: two positioning blocks are symmetrically arranged on two sides of the inner wall of the valve body and are used for being matched with an upper disc of the valve core, so that the valve core vertically moves up and down in the valve body; meanwhile, two positioning pins are arranged on the inner wall of the valve body at equal intervals with the two positioning blocks and used for being matched with the positioning grooves of the valve core, so that the valve core can not rotate by an angle when vertically moving up and down in the valve body.
4. The energy saving plug valve of claim 1, wherein: the bottom of the inner cavity of the valve body is provided with a circular sealing convex ring, the top surface of the sealing convex ring is provided with a sealing line, and the upper disc is abutted against the sealing line of the sealing convex ring; the bottom of the inner cavity of the valve body is positioned on the inner side of the sealing convex ring, 4 grooves are uniformly distributed, and springs are placed in the grooves.
5. The energy saving plug valve of claim 1, wherein: and a sealing ring is arranged between the bottom of the valve body and the screw compressor body.
6. A screw compressor comprising an economizer plug valve, comprising the economizer plug valve of any one of claims 1-5, wherein: the screw compressor further comprises a suction end seat, a suction cavity, a rotor, a slide valve, an exhaust end seat and an internal volume ratio adjusting mechanism, wherein the suction end seat, the suction cavity, the rotor, the slide valve, the exhaust end seat and the internal volume ratio adjusting mechanism are arranged on a machine body of the screw compressor; 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;
the internal volume ratio adjusting mechanism comprises a radial exhaust port and a jacket exhaust cavity, the radial exhaust port is formed in the position, close to the exhaust end seat, of the machine body of the screw compressor, and an energy-saving plug valve is arranged at the radial exhaust port and used for controlling the opening and closing of the radial exhaust port; the machine body of the screw compressor is provided with a jacket exhaust cavity communicated with the radial exhaust port, and the tail end of the jacket exhaust cavity is connected with an exhaust pipe;
under the working condition that the internal pressure and the external pressure of the compressor are equal, the internal volume ratio adjusting mechanism does not work, the energy-saving plug valve controls the radial exhaust port to be 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 energy-saving plug valve controls the radial exhaust port to be opened, and at the moment, compressed refrigerant gas enters the oil separator after passing through the jacket exhaust cavity and the exhaust pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011062302.3A CN112196791B (en) | 2020-09-30 | 2020-09-30 | Energy-saving plug valve and screw compressor comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011062302.3A CN112196791B (en) | 2020-09-30 | 2020-09-30 | Energy-saving plug valve and screw compressor comprising same |
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| CN112196791A true CN112196791A (en) | 2021-01-08 |
| CN112196791B CN112196791B (en) | 2023-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927771A (en) * | 2020-08-01 | 2020-11-13 | 上海格兰克林（集团）有限公司 | Nano-coating single-screw air compressor cylinder |
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| CN201486862U (en) * | 2009-08-10 | 2010-05-26 | 中国船舶重工集团公司第七一一研究所 | Internal pressure ratio adjusting device of screw type compressor |
| CN103016799A (en) * | 2011-09-28 | 2013-04-03 | 上海靓消消防装备有限公司 | Overflow valve |
| JP2015214908A (en) * | 2014-05-09 | 2015-12-03 | 日立アプライアンス株式会社 | Screw fluid machine |
| CN206268075U (en) * | 2016-10-21 | 2017-06-20 | 西安琦通新能源设备有限公司 | A kind of high-pressure screw compressor structure |
| CN214889182U (en) * | 2021-06-02 | 2021-11-26 | 南阳市龙升瑞科石油机械制造有限公司 | Anti-interference safety valve for oil drilling machine |
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| CN111927771A (en) * | 2020-08-01 | 2020-11-13 | 上海格兰克林（集团）有限公司 | Nano-coating single-screw air compressor cylinder |
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