CN116335941A - Automatic adjusting device and method for internal volume ratio of screw compressor - Google Patents

Automatic adjusting device and method for internal volume ratio of screw compressor Download PDF

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Publication number
CN116335941A
CN116335941A CN202310236661.3A CN202310236661A CN116335941A CN 116335941 A CN116335941 A CN 116335941A CN 202310236661 A CN202310236661 A CN 202310236661A CN 116335941 A CN116335941 A CN 116335941A
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China
Prior art keywords
slide valve
volume ratio
internal volume
valve
exhaust
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CN202310236661.3A
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Chinese (zh)
Inventor
樊凯
陈文卿
张震
何志龙
邢子文
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Changshu Siyuan Compressor Industry Collaborative Innovation Center
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Changshu Siyuan Compressor Industry Collaborative Innovation Center
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Priority to CN202310236661.3A priority Critical patent/CN116335941A/en
Publication of CN116335941A publication Critical patent/CN116335941A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses an automatic internal volume ratio adjusting device and method for a screw compressor, which belong to the technical field of compressors and comprise an internal volume ratio adjusting slide valve component, an air suction end plate, a shell, an exhaust end bearing seat and a cover plate thereof, an end cover, an electromagnetic valve for increasing and decreasing load, a pressure sensor and a computer control system. The internal volume ratio adjusting slide valve component comprises an internal volume ratio adjusting slide valve, a guide key, a slide valve guide rod, an oil piston and a spring, wherein the internal volume ratio adjusting slide valve can slide in a slide valve cavity of the casing, so that the internal volume ratio can be continuously adjusted; according to the invention, the collected real-time exhaust pressure is compared with the set rated exhaust pressure value, and the control of the content ratio regulating slide valve is realized through the load increasing electromagnetic valve and the load reducing electromagnetic valve, so that the real-time exhaust pressure in the shell slide valve cavity can be accurately regulated in real time; compared with the traditional slide valve position adjustment of the internal volume ratio, the method not only can automatically adjust the position of the slide valve of the internal volume ratio, but also has high adjustment precision.

Description

Automatic adjusting device and method for internal volume ratio of screw compressor
Technical Field
The invention belongs to the technical field of compressors, and relates to an automatic adjusting device and method for internal volume ratio of a screw compressor.
Background
With the development of the industrial level, the requirements on industrial equipment are increasingly stringent, and the performance of the screw compressor as an indispensable device in petroleum, petrochemical, metallurgical, refrigeration and other industries has an extremely important influence on the industrial development.
Screw compressors are affected by many factors in refrigeration conditions, and their operating compression ratio fluctuates over a relatively large range, resulting in the occurrence of an under-compression or over-compression phenomenon, which necessarily reduces the operating efficiency of the compressor. Therefore, to achieve an optimal compression ratio for the compressor that is adapted to varying external conditions, a slide valve mechanism is used to adjust the internal volume ratio. Currently, the inner volume is more manually adjusted than the slide valve, and the inner volume is manually moved by the pressure displayed on the pressure gauge communicated with the rotor cavity, so that the pressure in the rotor cavity is adjusted, but because of the accuracy displayed by the pressure gauge and the hysteresis of the adjustment of the staff, the manual adjustment often needs multiple times of adjustment to complete the position adjustment of the slide valve, and the adjustment precision is lower. The method is time-consuming and labor-consuming, increases labor intensity of workers, and reduces operation efficiency of the compressor.
Therefore, for the screw compressor, if the internal volume ratio adjusting slide valve can realize automatic and accurate adjustment according to actual working conditions, the labor intensity of workers is reduced for enterprises, and the running efficiency of the compressor is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an automatic adjusting device and an automatic adjusting method for the internal volume ratio of a screw compressor, by which the position of a slide valve of the internal volume ratio can be automatically and accurately adjusted, so that the optimal compression ratio of the compressor is ensured, the compressor is adapted to changing external working conditions, the labor intensity of workers is reduced, and the running efficiency of the compressor is improved.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
an automatic adjusting method for the internal volume ratio of a screw compressor comprises the following steps:
step 1, setting an upper limit and a lower limit of a rated exhaust pressure value;
step 2, collecting real-time exhaust pressure in the shell sliding valve cavity through a pressure sensor; the pressure sensor is communicated with a through hole on the inner volume ratio adjusting slide valve to collect real-time exhaust pressure in the shell slide valve cavity;
step 3, judging whether the real-time exhaust pressure is between an upper limit and a lower limit, and if so, stopping adjusting the real-time exhaust pressure; if not, the internal volume ratio is moved by the load increasing electromagnetic valve and the load reducing electromagnetic valve to adjust the slide valve, so as to adjust the real-time exhaust pressure in the shell slide valve cavity.
The invention further improves that:
preferably, in step 3, if the real-time exhaust pressure is greater than the upper limit of the rated exhaust pressure value, the content ratio regulating slide valve moves toward the air suction end; if the real-time discharge pressure is less than the lower limit of the rated discharge pressure value, the content ratio regulating slide valve moves towards the discharge end.
Preferably, when the content ratio adjusting slide valve moves toward the suction end, the flow path of the hydraulic oil is: hydraulic oil enters the load increasing electromagnetic valve through an internal oil passage of the exhaust end bearing seat, hydraulic oil flowing out of the load increasing electromagnetic valve enters an internal oil passage of the exhaust end seat cover plate through an internal oil passage of the exhaust end bearing seat again, then enters an internal oil passage of the end cover, flows into an oil piston cavity to drive an oil piston to move, and further drives a content ratio regulating slide valve to move towards an air suction end.
Preferably, when the content ratio adjusting spool valve moves toward the exhaust end, the flow path of the hydraulic oil is: the hydraulic oil enters the end cover internal oil passage through the oil piston cavity, then enters the exhaust end bearing seat internal oil passage through the exhaust end bearing seat cover plate internal oil passage, enters the shell internal oil passage through the exhaust end bearing seat internal oil passage after passing through the load relief electromagnetic valve, and finally enters the shell rotor cavity, so that the oil piston moves, and the internal volume ratio adjusting slide valve moves towards the exhaust end.
Preferably, in step 3, if the real-time exhaust pressure is between the upper limit and the lower limit of the rated exhaust pressure value, both the load increasing solenoid valve and the load reducing solenoid valve are closed.
The automatic adjusting device for realizing the internal volume ratio of the screw compressor comprises a shell, wherein the exhaust end of the shell is connected with an exhaust end bearing seat, and the outer end of the exhaust end bearing seat is connected with an exhaust end bearing seat cover plate;
an oil piston is arranged in the exhaust end bearing seat cover plate, slide valve guide rods are arranged in the exhaust end bearing seat and the exhaust end bearing seat cover plate together, and an internal volume ratio adjusting slide valve is arranged in the shell;
the power output end of the oil piston is connected with a slide valve guide rod, and the other end of the slide valve guide rod is connected with an internal volume ratio adjusting slide valve;
the exhaust end bearing seat is provided with a load increasing electromagnetic valve and a load reducing electromagnetic valve, and the load increasing electromagnetic valve and the load reducing electromagnetic valve control the moving direction of the oil piston through hydraulic oil;
the casing is inserted with a pressure sensor, the exhaust end of the internal volume ratio regulating slide valve is provided with a through hole, one end of the through hole is communicated with the exhaust end of the rotor cavity, and the other end of the through hole is communicated with the pressure sensor;
the pressure sensor is connected with a computer control system, the computer control system is connected with a valve oil control piston PLC control module, and the valve oil control piston PLC control module is connected with the load increasing electromagnetic valve and the load reducing electromagnetic valve.
Preferably, the bottom of the internal volume ratio adjusting slide valve is provided with a vent groove, and the through hole is communicated with the pressure sensor through the vent groove.
Preferably, the bottom of the internal volume ratio adjusting slide valve is provided with a guide groove, the bottom of the shell is provided with a slide valve guide key, and the upper end of the slide valve guide key extends into the guide groove.
Preferably, the oil piston is provided with two circles of sealing grooves around the circumference, and sealing rings are arranged in the sealing grooves.
Preferably, the shell is provided with a shell shoulder at the exhaust end, and the air suction end plate is arranged on the air suction end face of the shell.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses an automatic adjusting method for the internal volume ratio of a screw compressor, which is characterized in that the control of a content ratio adjusting slide valve is realized through a load increasing electromagnetic valve and a load reducing electromagnetic valve by comparing the collected real-time exhaust pressure with a set rated exhaust pressure value, so that the real-time exhaust pressure in a shell slide valve cavity can be accurately adjusted in real time; compared with the traditional slide valve position adjustment of the internal volume ratio, the method not only can automatically adjust the position of the slide valve of the internal volume ratio, but also has high adjustment precision.
The invention discloses an automatic adjusting device for the internal volume ratio of a screw compressor, which comprises an internal volume ratio adjusting slide valve component, a shell, an exhaust end bearing seat, a cover plate, an end cover, an electromagnetic valve for increasing and decreasing load, a pressure sensor, a computer control system and a valve oil control piston PLC control module. The internal volume ratio adjusting slide valve component comprises an internal volume ratio adjusting slide valve, a guide key, a slide valve guide rod, an oil piston and a spring, wherein the internal volume ratio adjusting slide valve can slide in a slide valve cavity of the casing, and the internal volume ratio can be continuously adjusted. The pressure sensor is arranged at the bottom of the shell and used for detecting the real-time exhaust pressure p1; the load-increasing and reducing electromagnetic valve is arranged on the exhaust end bearing seat, the computer control system controls the load-increasing and reducing electromagnetic valve to be switched on and off by comparing the p1 with the rated exhaust pressure value pk set by the system, so that hydraulic oil enters and exits the oil piston cavity, and further the slide valve is driven to move, and the internal volume ratio is automatically adjusted. By the automatic adjusting device and the method, the internal volume ratio can be accurately adjusted, over-compression or under-compression can be effectively avoided, and the compression efficiency of the compressor and the refrigerating energy efficiency of the unit are improved.
Further, a suction end plate is provided to be mounted on a suction end surface in the casing, so that leakage of the compressed gas from a gap between the casing and the slide valve can be prevented.
Further, in order to ensure that the sensor hole on the casing is always communicated with the through hole formed in the slide valve, a groove with the length of 120mm and the width of 10mm is formed in the bottom of the slide valve, and the sensor hole and the through hole on the slide valve can be communicated through the groove in the moving process of the slide valve.
Furthermore, in order to ensure that oil leaks into the spring cavity from a gap between the oil piston and the bearing seat cover plate hole of the exhaust end as little as possible, two annular sealing grooves are formed in the oil piston, and sealing rings are arranged in the grooves.
Further, in order to prevent the slide valve from excessively moving toward the suction side and causing collision with the motor, a shoulder is provided on the casing.
Drawings
FIG. 1 is a control flow diagram of the automatic adjustment of the internal volume ratio slide valve in the present invention.
FIG. 2 is a cross-sectional view of the overall structure of the present invention;
marked in the figure as: 1 is an end cover; 2 is an exhaust end bearing seat cover plate; 3 is an exhaust end bearing seat; 4 is a shell; 5-through holes; 6 is a pressure sensor; 7 is an internal volume ratio regulating slide valve; 8 is a slide valve guide key; 9 is a load increasing electromagnetic valve; 10 is a load relief electromagnetic valve; 11 is a slide valve guide rod; 12 is a spring; 13 is an oil piston;
fig. 3 shows a groove formed at the bottom of the exhaust end of the internal volume ratio adjusting slide valve 7, wherein 15 is a ventilation groove.
Fig. 4 is a partially enlarged sectional view of the whole structure in the present invention. 14 is the suction end plate; 20 is a guide groove
Fig. 5 is a view showing the structure of the suction end plate.
Fig. 6 is a view showing a mounting position of the suction end plate on the casing.
Fig. 7 shows the oil piston with seal groove and its relative position to the exhaust end bearing housing cover plate. 16 is an annular seal groove I; and 17 is a second annular seal groove.
FIG. 8 is a relative position diagram of the motor, housing shoulder and internal volume ratio adjustment spool valve. 18 is a motor; 19 is the housing shoulder.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures and to specific examples:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
One of the embodiments of the invention discloses an automatic adjusting method for the internal volume ratio of a screw compressor, which comprises the following steps:
step 1, setting an upper limit and a lower limit of a rated exhaust pressure value;
the method of the invention is based on an automation process, and firstly, an upper limit and a lower limit of a rated exhaust pressure value are set in an upper computer to form a target range of exhaust pressure in a sliding valve cavity, p Lower part(s) ≤p 1 ≤p Upper part The upper computer inputs the target of the exhaust pressure into a valve oil control piston PLC control module;
step 2, collecting real-time exhaust pressure in the shell sliding valve cavity through a pressure sensor 6;
the pressure sensor 6 is directly communicated with the shell slide valve cavity, can collect the exhaust pressure in the shell slide valve cavity in real time, and meanwhile, transmits the collected value of the pressure sensor 6 to the valve oil control piston plc control module.
Step 3, judging whether the real-time exhaust pressure is between an upper limit and a lower limit, and if so, stopping adjusting the real-time exhaust pressure; if not, the internal volume ratio is adjusted by the load increasing electromagnetic valve 9 and the load reducing electromagnetic valve 10 to adjust the slide valve 7, so as to adjust the real-time exhaust pressure in the shell slide valve cavity.
Specifically, the device is mainly used for controlling the on-off of the load increasing electromagnetic valve 9 and the load reducing electromagnetic valve 10, the two electromagnetic valves jointly regulate the movement of the inner volume regulating slide valve 7, and the exhaust pressure of the shell slide valve cavity is regulated through the movement of the inner volume regulating slide valve 7 in the shell slide valve cavity.
After receiving the exhaust pressure collected by the pressure sensor 6, the valve oil control piston PLC control module compares the exhaust pressure with a target range of the exhaust pressure, and specifically comprises the following three conditions:
(1) If p 1 >p Upper part The computer control system transmits the internal volume ratio reducing signal to the valve oil control piston control module, the load increasing electromagnetic valve 9 is opened, so that the internal volume ratio regulating slide valve 7 moves towards the air suction end, and the exhaust pressure p is real-time 1 The value decreases;
(2) If p 1 <p Lower part(s) The computer control system transmits the internal volume ratio increasing signal to the valve oil control piston control module, and the load reducing electromagnetic valve is opened, so that the internal volume ratio regulating slide valve moves towards the exhaust end and the exhaust pressure p is real-time 1 The value increases;
(3) If p Lower part(s) ≦p 1 ≦p Upper part And the computer control system stops comparing the p value, transmits an internal volume ratio adjustment completion signal to the valve oil control piston PLC control module, closes the load-increasing and reducing electromagnetic valves, fixes the position of the internal volume ratio adjusting slide valve, and completes the current exhaust pressure monitoring and slide valve position adjustment.
Further, because the movement of the load increasing solenoid valve 9 and the load reducing solenoid valve 10 is changed from original manual operation to automatic adjustment, the whole control oil path is changed, specifically:
if p 1 >p Upper part The computer control system transmits the internal volume ratio reducing signal to the load increasing electromagnetic valve 9 and the load reducing electromagnetic valve 10, the oil control piston 13 controls the module, and the load increasing electromagnetic valve 9 is opened; the hydraulic oil flow path is: internal oil duct of exhaust end bearing seat 3- & gtload increasing electromagnetic valve 9- & gtThe internal oil passage of the exhaust end bearing seat 3, the internal oil passage of the exhaust end seat cover plate 2, the internal oil passage of the end cover 1, the oil piston cavity of the exhaust end seat cover plate 2, and the oil pushes the oil piston 13 to move, so that the internal volume ratio regulating slide valve 7 moves towards the air suction end, and the exhaust pressure p is real-time 1 The value decreases. When the oil duct of the exhaust end seat cover plate 2 is perforated on the reinforcing rib, only one hole is needed to be drilled, so that the processing time of parts is shortened.
If p 1 <p Lower part(s) The computer control system transmits the internal volume ratio increasing signal to the control module of the oil control piston 13 of the valves 9 and 10, the load reducing electromagnetic valve 10 is opened, and the hydraulic oil flow path is as follows: the oil piston cavity of the exhaust end seat cover plate 2, the oil passage inside the end cover 1, the oil passage inside the exhaust end seat cover plate 2, the oil passage inside the exhaust end bearing seat 3, the load relief electromagnetic valve 10, the oil passage inside the exhaust end bearing seat 3, the oil passage inside the shell 4, the rotor cavity of the shell 4 and the oil piston 13 move, so that the internal volume ratio regulating slide valve 7 moves towards the exhaust end, and the exhaust pressure p is real-time 1 The value increases. In this process, when the fluid gets back to the rotor chamber of casing 4, through the setting of the inside oil duct of casing 4 for fluid can get back to the upside in rotor chamber, can utilize the fluid cooling, compare in conventional space lower part that gets back to between motor and the rotor, the fluid deposit is here, not fully utilized, is unfavorable for breathing in moreover.
Because the whole adjusting process is not manually operated except that the upper limit and the lower limit of the pressure are manually input in the early stage, and the whole process is not manually operated except special conditions in the control process, the automatic adjusting method of the internal volume ratio of the screw compressor is realized on the basis that the whole adjusting process is smoother and more efficient, and one embodiment of the invention provides a device for automatically adjusting the internal volume ratio of the rod compressor conveniently.
Referring to fig. 2, the automatic internal volume ratio adjusting device of the screw compressor comprises an internal volume ratio adjusting slide valve assembly, an air suction end plate, a shell 4, an exhaust end bearing seat 3, a cover plate 2 thereof, an end cover 1, a load increasing electromagnetic valve 9, a load reducing electromagnetic valve 10, a pressure sensor 6 and a computer control system. The internal volume ratio adjusting slide valve assembly comprises an internal volume ratio adjusting slide valve 7, a slide valve guide key 8, a slide valve guide rod 11, an oil piston 13 and a spring 12, wherein the internal volume ratio adjusting slide valve 7 can slide in a slide valve cavity of the casing, so that the internal volume ratio can be continuously adjusted.
One end of the shell 4 is an air suction end, the other end of the shell is an air exhaust end, the air exhaust end of the shell is connected with the air exhaust end bearing seat 3, the outer end of the air exhaust end bearing seat 3 is connected with the air exhaust end bearing seat cover plate 2, and the outer end of the air exhaust end bearing seat cover plate 2 is connected with the end cover 1.
The main two cavities are arranged in the shell 4, one is a rotor cavity 14, the other is a shell sliding valve cavity, the two cavities are communicated, the outer end of a sliding valve guide rod 11 is connected with an oil piston 13, the inner end of the sliding valve guide rod 11 is connected with a content ratio adjusting sliding valve 7, a spring 12 is sleeved on the sliding valve guide rod 11 in an exhaust end bearing seat cover plate 2, the sliding valve guide rod 11 is mainly placed in the cavity of the exhaust end bearing seat 3, and the internal volume ratio adjusting sliding valve 7 is mainly arranged in the shell sliding valve cavity; by compressing the spring 12 by the slide valve guide rod 11, the slide valve guide rod 11 can move along the axis of the slide valve guide rod, so that the internal volume ratio adjusting slide valve 7 is driven to slide in the slide valve cavity of the casing, and the exhaust pressure is adjusted.
Based on the above structure, the existing device is mainly provided with a pressure gauge which is directly arranged on the casing 4 and communicated with the rotor cavity, and a worker adjusts the movement of the oil piston 13 through adjusting the load increasing electromagnetic valve 9 and the load reducing electromagnetic valve 10 by the pressure displayed on the pressure gauge, so as to adjust the movement of the internal volume ratio regulating valve 7.
Referring to fig. 3, the lower part of the exhaust end of the internal volume ratio adjusting slide valve 7 of the present invention is provided with a vent groove 15 along the axis, one end of the vent groove 15 is provided with a through hole 5, the other end is communicated with the pressure sensor 6, and the position of the through hole 5 is positioned at the exhaust end part (left end part in fig. 1) of the internal volume ratio adjusting slide valve 7, the through hole 5 penetrates through the upper and lower end surfaces of the internal volume ratio adjusting slide valve 7, one end is communicated with the exhaust end of the rotor cavity, and the other end is communicated with the pressure sensor 6 through the vent groove 15, so that the exhaust pressure of the internal volume ratio adjusting slide valve 7 can be measured in real time. Preferably, the axis of the through hole 5 is perpendicular to the axis of the internal volume ratio adjusting slide valve 7, even a pressure sensor 6 is installed at the bottom of the casing 4, the pressure sensor 6 is inserted inwards from the bottom of the casing 4 and is communicated 15 with the through hole 5 formed at the exhaust end of the internal volume ratio adjusting slide valve through a vent groove 15, and the vent groove 15 can transmit the pressure at the through hole 5 to the pressure sensor 6 in real time so as to detect the real-time exhaust pressure p1.
Referring to fig. 5, 6 and 7, the present invention mounts the suction end plate 14 on the suction end surface in the casing 4 by bolting for controlling the suction end surface gap, and at the same time, prevents the leakage of the compressed gas from the gap between the casing 4 and the slide valve 7. The bottom of the internal volume ratio regulating slide valve 7 is also provided with a guide groove 20 at the lower part close to the air suction end, a slide valve guide key 8 is arranged at the bottom of the casing 4, and the top of the slide valve guide key is arranged in the guide groove 20, so that the internal volume ratio regulating slide valve 7 can axially move, and the slide valve is prevented from being blocked due to circumferential movement.
Referring to fig. 8, two layers of annular sealing grooves, namely a first annular sealing groove 16 and a second annular sealing groove 17, are formed on the oil piston 13 around the circumference of the oil piston, and are used for placing sealing rings, so that when the oil piston 13 moves on the cover plate of the bearing seat at the exhaust end, the overall tightness is improved.
Referring to fig. 8, the casing 4 is provided with a circle of casing stop shoulder 19 at the exhaust end thereof, and the casing stop shoulder 19 can prevent the internal volume ratio adjusting slide valve 17 from being excessively adjusted to cause false collision with the motor 18; the motor is arranged in the motor cavity, the motor rotor is connected with the male rotor extension shaft, the motor rotor rotates to drive the male rotor to rotate, and the male rotor and the female rotor are meshed to rotate, so that compression is realized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. The automatic adjusting method for the internal volume ratio of the screw compressor is characterized by comprising the following steps of:
step 1, setting an upper limit and a lower limit of a rated exhaust pressure value;
step 2, collecting real-time exhaust pressure in a shell sliding valve cavity through a pressure sensor (6); the pressure sensor (6) is communicated with a through hole (5) on the internal volume ratio adjusting slide valve (7) to collect real-time exhaust pressure in the shell slide valve cavity;
step 3, judging whether the real-time exhaust pressure is between an upper limit and a lower limit, and if so, stopping adjusting the real-time exhaust pressure; if not, the internal volume ratio adjusting slide valve (7) is moved through the load increasing electromagnetic valve (9) and the load reducing electromagnetic valve (10), so that the real-time exhaust pressure in the shell slide valve cavity is adjusted.
2. The method for automatically adjusting the internal volume ratio of the screw compressor according to claim 1, wherein in the step 3, if the real-time discharge pressure is greater than the upper limit of the rated discharge pressure value, the content ratio adjusting slide valve (7) moves toward the suction end; if the real-time exhaust pressure is less than the lower limit of the rated exhaust pressure value, the content ratio regulating slide valve (7) moves towards the exhaust end.
3. A method for automatically adjusting the internal volume ratio of a screw compressor according to claim 3, wherein when the content ratio adjusting slide valve (7) moves toward the suction end, the flow path of the hydraulic oil is: hydraulic oil enters the load increasing electromagnetic valve (9) through an internal oil passage of the exhaust end bearing seat (3), hydraulic oil flowing out of the load increasing electromagnetic valve (9) enters an internal oil passage of the exhaust end seat cover plate (2) through an internal oil passage of the exhaust end bearing seat (3) again, then enters an internal oil passage of the end cover (1), flows into an oil piston cavity to drive an oil piston (13) to move, and further drives the content ratio adjusting slide valve (7) to move towards an air suction end.
4. A method for automatically adjusting the internal volume ratio of a screw compressor according to claim 3, wherein when the content ratio adjusting slide valve (7) moves toward the discharge end, the flow path of the hydraulic oil is: the hydraulic oil enters the inner oil passage of the end cover (1) through the oil piston cavity, then enters the inner oil passage of the exhaust end bearing seat (3) through the inner oil passage of the exhaust end seat cover plate (2), enters the inner oil passage of the casing (4) through the inner oil passage of the exhaust end bearing seat (3) after passing through the load reducing electromagnetic valve (10), and finally enters the rotor cavity of the casing (4), so that the oil piston (13) moves, and the internal volume ratio adjusting slide valve (7) moves towards the exhaust end.
5. The method according to claim 1, wherein in step 3, if the real-time discharge pressure is between the upper limit and the lower limit of the rated discharge pressure value, both the load increasing solenoid valve (9) and the load reducing solenoid valve (10) are closed.
6. An automatic adjusting device for realizing the internal volume ratio of the screw compressor of claim 1, which is characterized by comprising a shell (4), wherein the exhaust end of the shell (4) is connected with an exhaust end bearing seat (3), and the outer end of the exhaust end bearing seat (3) is connected with an exhaust end bearing seat cover plate (2);
an oil piston (13) is arranged in the exhaust end bearing seat cover plate (2), a slide valve guide rod (11) is arranged in the exhaust end bearing seat (3) and the exhaust end bearing seat cover plate (2) together, and an internal volume ratio adjusting slide valve (7) is arranged in the shell (4);
the power output end of the oil piston (13) is connected with a slide valve guide rod (11), and the other end of the slide valve guide rod (11) is connected with an internal volume ratio adjusting slide valve (7);
the exhaust end bearing seat (3) is provided with a load increasing electromagnetic valve (9) and a load reducing electromagnetic valve (10), and the load increasing electromagnetic valve (9) and the load reducing electromagnetic valve (10) control the moving direction of the oil piston (13) through hydraulic oil;
a pressure sensor (6) is inserted into the casing (4), a through hole (5) is formed in the exhaust end of the internal volume ratio regulating slide valve (7), one end of the through hole (5) is communicated with the exhaust end of the rotor cavity, and the other end of the through hole (5) is communicated with the pressure sensor (6);
the pressure sensor (6) is connected with a computer control system, the computer control system is connected with a valve oil control piston PLC control module, and the valve oil control piston PLC control module is connected with the load increasing electromagnetic valve (9) and the load reducing electromagnetic valve (10).
7. The automatic internal volume ratio adjusting device of the screw compressor according to claim 6, wherein the bottom of the internal volume ratio adjusting slide valve (7) is provided with a vent groove (15), and the through hole (5) is communicated with the pressure sensor (6) through the vent groove (15).
8. The automatic adjusting device for the internal volume ratio of the screw compressor according to claim 6, wherein the guiding groove (20) is formed at the bottom of the internal volume ratio adjusting slide valve (7), the slide valve guiding key (8) is installed at the bottom of the casing (4), and the upper end of the slide valve guiding key (8) extends into the guiding groove (20).
9. The automatic adjusting device for the internal volume ratio of the screw compressor according to claim 6, wherein the oil piston (13) is provided with two circles of sealing grooves around the circumference, and sealing rings are arranged in the sealing grooves.
10. An automatic adjusting device for internal volume ratio of screw compressor according to claim 6, characterized in that the casing (4) is provided with a casing shoulder (19) at the exhaust end, and the suction end face of the casing (4) is provided with a suction end plate (14).
CN202310236661.3A 2023-03-13 2023-03-13 Automatic adjusting device and method for internal volume ratio of screw compressor Pending CN116335941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310236661.3A CN116335941A (en) 2023-03-13 2023-03-13 Automatic adjusting device and method for internal volume ratio of screw compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310236661.3A CN116335941A (en) 2023-03-13 2023-03-13 Automatic adjusting device and method for internal volume ratio of screw compressor

Publications (1)

Publication Number Publication Date
CN116335941A true CN116335941A (en) 2023-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310236661.3A Pending CN116335941A (en) 2023-03-13 2023-03-13 Automatic adjusting device and method for internal volume ratio of screw compressor

Country Status (1)

Country Link
CN (1) CN116335941A (en)

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