CN214196588U - Two-stage compressor unit capable of adjusting stepless air quantity - Google Patents
Two-stage compressor unit capable of adjusting stepless air quantity Download PDFInfo
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- CN214196588U CN214196588U CN202022186025.9U CN202022186025U CN214196588U CN 214196588 U CN214196588 U CN 214196588U CN 202022186025 U CN202022186025 U CN 202022186025U CN 214196588 U CN214196588 U CN 214196588U
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Abstract
The utility model discloses a reciprocating gas compressor field especially relates to a two-stage compressor unit that can carry out stepless tolerance and adjust. The variable frequency motor that driving motor adopted and to carry out the rotational speed regulation, be equipped with the clearance jar with its fixed connection on the one-level cylinder, be equipped with the control valve of the two break-make of control between clearance jar and the one-level cylinder, control valve and PLC control system electric connection, be equipped with one-level pneumatic valve ejecting device and second grade pneumatic valve ejecting device on the lid side admission valve on one-level cylinder and the second grade cylinder respectively, one-level pneumatic valve ejecting device and second grade pneumatic valve ejecting device and PLC control system electric connection, when this technical scheme was used for solving the mode that uses partial stroke to open the admission valve regulation to compressor tolerance among the prior art, need introduce extra regulating apparatus, the expense is higher, and can make the admission valve block receive extra load, the striking frequently, seriously worsens the problem of valve block life-span and tightness.
Description
Technical Field
The utility model discloses a reciprocating gas compressor field especially relates to a two-stage compressor unit that can carry out stepless tolerance and adjust.
Background
The reciprocating compressor is widely applied to the petrochemical industry as a general power device. The rated flow of the reciprocating compressor is determined when the reciprocating compressor is designed, but the required actual gas amount is different along with different working conditions of a process flow and gas consumption equipment, so that measures are required to be taken to adjust the gas amount. The traditional stepless air quantity regulation mostly adopts partial stroke top-opening air inlet valve regulation, the method has the best economical efficiency in a plurality of regulation methods, but the regulation method of the partial stroke top-opening air valve needs additional equipment investment and has higher cost, and the valve plate is subjected to additional load, the impact is more frequent, and the service life and the tightness of the valve plate are seriously deteriorated.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the above-mentioned prior art, the utility model aims to provide a can carry out compressor unit that tolerance was adjusted for when solving the mode that uses partial stroke to back open the air inlet valve regulation among the prior art and adjusting the compressor tolerance, need introduce extra adjusting device, the expense is higher, and can make the air inlet valve block receive extra load, and the striking is frequent, seriously worsens the problem of valve block life-span and tightness.
In order to achieve the purpose, the utility model discloses a technical scheme as follows, including one-level cylinder, second grade cylinder, bent axle link mechanism, PLC control system and driving motor, be connected through bent axle link mechanism between driving motor and one-level cylinder and the second grade cylinder, electric connection between PLC control system and the driving motor, driving motor adopts the inverter motor that can carry out the rotational speed regulation, be equipped with fixed connection's clearance jar with it on the one-level cylinder, be equipped with the control valve of the two break-make of control between clearance jar and the one-level cylinder, control valve and PLC control system electric connection, be equipped with one-level pneumatic valve top opening device and second grade pneumatic valve top opening device on the lid side admission valve on one-level cylinder and the second grade cylinder respectively, one-level pneumatic valve top opening device and second grade pneumatic valve top opening device and PLC control system electric connection.
Further limiting, the driving motor enables the compressor unit to achieve 60% -100% output air quantity adjustment under the control and adjustment of the rotating speed of the PLC control system.
Further limiting, the control valve is an electromagnetic valve, and two ends of the electromagnetic valve are connected with the clearance cylinder and the first-stage cylinder through flanges.
Further limiting, when the electromagnetic valve is opened, the clearance cylinder is communicated with the primary air cylinder, and under the combined action of the clearance cylinder and the driving motor, the compressor unit can achieve output air quantity regulation of 40% -100%.
Further, the first-stage air valve jacking device and the second-stage air valve jacking device fully jack the first-stage cover side air inlet valve and the second-stage cover side air inlet valve during working.
Further limiting, the PLC control system can realize the adjustment of the gas output of the compressor unit between 30% and 100% by changing the rotating speed of the driving motor, opening the control valve to enable the clearance cylinder to be communicated with the primary air cylinder and controlling the primary air valve jacking device and the secondary air valve jacking device to completely jack the primary cover side air valve and the secondary cover side air valve.
Further limiting, the driving motor, the clearance cylinder, the primary air valve jacking device and the secondary air valve jacking device participate in output air volume regulation in sequence, and the driving motor, the clearance cylinder, the primary air valve jacking device and the secondary air valve jacking device are sequentially arranged.
The adjusting steps of the technical proposal are that according to the actual required output gas quantity, the PLC control system firstly realizes the adjustment within the range of 60 percent to 100 percent by controlling the rotating speed of the variable frequency motor, when the actual required output gas quantity is less than 60 percent of the rated output gas quantity, the PLC control system then opens the control valve to communicate the clearance cylinder with the first-stage cylinder, the clearance volume of the cylinder body is increased, the stroke of the piston rod is fixed, the output air volume is reduced, therefore, the regulation in the range of 40-60% can be realized, when the actually required output gas amount is less than 40% of the rated output gas amount, the PLC control system controls the primary air valve jacking device and the secondary air valve jacking device to jack the primary cover side air inlet valve and the secondary cover side air inlet valve completely, and at the moment, part of compressed air in the cylinder body is discharged through the jacked cover side air valve, so that the output air volume is reduced, and the air volume adjustment in the range of 30% -40% can be realized.
To sum up, the utility model discloses an use the rotational speed that changes inverter motor, put through the clearance jar and the three kinds of regulative modes of the side admission valve of top-open cover, can realize the continuous flow control of compressor unit between 30% ~ 100%, change with the tolerance that satisfies in-service use, reach energy saving and consumption reduction's purpose, and change fewly to compressor unit's structure, the input cost is low, and economic nature is good, the top-open pneumatic valve only uses at the very low segment within range of tolerance, and top-open pneumatic valve completely, the in-process valve block need not extra action, it is little to the influence of pneumatic valve life.
Drawings
Fig. 1 is a schematic plan view of an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the variable frequency electric motor comprises a variable frequency motor 1, a clearance cylinder 2, a control valve 3, a primary cover side air inlet valve 4, a secondary cover side air inlet valve 5, a primary air valve jacking device 6 and a secondary air valve jacking device 7.
The specific implementation process is as follows:
as shown in fig. 1, a two-stage compressor set capable of stepless air volume adjustment mainly comprises a first-stage cylinder, a second-stage cylinder, a piston and a piston rod which are arranged in the first-stage cylinder and the second-stage cylinder, wherein the piston rod is driven by a crankshaft connecting rod mechanism to drive the piston to reciprocate, an output shaft of a driving motor is connected with a crankshaft through a coupling, and cylinder bodies of the first-stage cylinder and the second-stage cylinder are respectively provided with a first-stage (second) -cover-side air inlet valve, a first-stage (second) -shaft-side air inlet valve and a first-stage (second-stage) exhaust valve, and a first-stage air valve jacking device and a second-stage air valve jacking device which are arranged on the first-stage cylinder and the second-stage cylinder. Since the above-mentioned components are prior art, the description will not be made in the present embodiment.
In order to realize adjusting compressor unit's output gas volume between rated output gas volume 60% -100% the utility model discloses well driving motor adopts inverter motor 1, because inverter motor 1 can realize the rotational speed and adjust, when the rotational speed reduces, the duty cycle number of times of accomplishing in between the unit reduces, has reduced the compression tolerance promptly, has reached the purpose that changes the output gas volume.
If the output gas is adjusted between 40% and 100% of the rated output gas, on the premise of changing the driving motor into the variable frequency motor 1, a clearance cylinder 2 is also required to be connected in series on the primary cylinder, a control valve 3 for controlling the connection or disconnection of the clearance cylinder 2 and the primary cylinder is arranged between the clearance cylinder and the primary cylinder, in the utility model, the control valve 3 is a solenoid valve, the solenoid valve is electrically connected with the PLC control system, when the output air quantity is less than 60 percent of the rated output, in order to ensure the operation safety of the variable frequency motor 1, the rotating speed of the variable frequency motor 1 is not reduced continuously, at the moment, the control valve 3 needs to be opened under the action of the PLC control system to communicate the clearance cylinder 2 with the first-stage cylinder, i.e. the clearance volume of the cylinder is increased, whereas the fresh gas entering the interior of the cylinder is reduced, i.e. the output gas is reduced, since the stroke of the piston rod is fixed.
In order to realize the adjustment of exhaust gas quantity in smaller intervals, a first-stage air valve top opening device 6 and a second-stage air valve top opening device 7 are arranged on the cover side air inlet valves of a first-stage air cylinder and a second-stage air valve top opening device 7, a PLC control system respectively controls the first-stage air valve top opening device 6 and the second-stage air valve top opening device 7 to completely top open a first-stage cover side air inlet valve 4 and a second-stage cover side air inlet valve 5, when a piston compresses gas, a part of gas is exhausted through a first-stage (second-stage) cover side air inlet valve, only a shaft side air cylinder compresses the gas, the output gas quantity is also reduced, three adjusting modes of changing the rotating speed of a variable frequency motor 1 and switching on a clearance cylinder 2 and the top opening cover side air inlet valve are sequentially used, the continuous flow regulation of a compressor unit between 30 percent and 100 percent can be realized, the gas quantity change in practical use is met, the purposes of energy conservation and consumption reduction are achieved, and the structure change of the compressor unit is less, the valve plate is not required to be additionally moved in the process, and the influence on the service life of the valve plate is small.
The deduction process adopting the technical scheme is as follows:
the volume flow of the compressor is calculated by equation (1):
Q＝λvλpλlλTVhn (1)
in the formula, Q-volume flow, m3/min；λv-a volume factor; lambda [ alpha ]p-a pressure coefficient; lambda [ alpha ]l-a leakage factor; lambda [ alpha ]T-a temperature coefficient; vh-stroke volume, m3(ii) a n is the rotation speed r/min.
The change of the volume flow can be realized by changing any one or more of the parameters, and the invention changes the rotating speed n and the volume coefficient lambdavAnd leakage coefficient lambdalThe combined mode realizes stepless regulation of the flow.
After the clearance cylinder 2 is communicated, the lower limit value eta of flow regulation1The relation with the relative clearance alpha' of the cylinder is as the formula (2):
wherein, alpha' is a relative clearance behind the communication of the clearance cylinder 2; epsilon' -the primary pressure ratio after the communication with the clearance cylinder 2; alpha is relative clearance of design working condition; epsilon-design condition first-order pressure ratio; m is the compressor expansion process index. The lower limit value η 2 of the flow rate adjustment after the one-stage cover-side intake valve 4 is pushed open can be obtained by the equation (3):
lower limit eta of flow regulation after the first and second stage cover side intake valves 5 are opened3From formula (4):
in the formula, D is the diameter of a primary cylinder and m; d-piston rod diameter, m; epsilon "-the back pressure ratio of the primary cover side intake valve 4 is lifted open; epsilon' -liftoff of the first and second stage cover side intake valve 5 back pressure ratio.
As can be seen from equation (1), the continuous adjustment of the flow rate can be realized by changing the rotation speed, but when the variable frequency motor 1 is continuously operated, the variable frequency range is generally 60% to 100% for safety, that is, the continuous adjustment of the flow rate from 60% to 100% can be realized only by changing the rotation speed, and the flow rate adjustment in the lower range is realized by the variable speed combination of the clearance cylinder 2 and the intake valve on the side of the top-open cover. When the flow range is between 60% and 100%, the flow range can be realized by directly changing the rotating speed of the variable frequency motor 1.
When the flow range is between 40% and 60%, the flow range is realized by combining the variable rotating speed with the clearance cylinder 2, and the size of the required clearance cylinder 2 can be calculated by the formula (2).
When the flow range is between 30% and 40%, the variable-speed combined mode of ejecting the cover side air inlet valve and the clearance cylinder 2 is adopted.
The rated rotation speed is 985r/min, the rated air inlet pressure is 1.0MPaG, the rated exhaust pressure is 5.5MPaG, and the rated flow is 5 multiplied by 104Nm3A 2D type two-column double-acting reciprocating compressor of/D is taken as an example. The corresponding regulation when the flow rate varies between 30% and 100% is shown in the following table:
it should be noted that, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. The utility model provides a can carry out two-stage compressor unit that stepless tolerance was adjusted, includes one-level cylinder, second grade cylinder, bent axle link mechanism, PLC control system and driving motor, be connected through bent axle link mechanism between driving motor and one-level cylinder and the second grade cylinder, electric connection, its characterized in that between PLC control system and the driving motor: the variable frequency motor that driving motor adopted can carry out the rotational speed and adjust, be equipped with the clearance jar of fixed connection with it on the one-level cylinder, be equipped with the control valve of the two break-make of control between clearance jar and the one-level cylinder, control valve and PLC control system electric connection, be equipped with one-level pneumatic valve top-opening device and second grade pneumatic valve top-opening device on the lid side admission valve on one-level cylinder and the second grade cylinder respectively, one-level pneumatic valve top-opening device and second grade pneumatic valve top-opening device and PLC control system electric connection.
2. The two-stage compressor unit capable of stepless air quantity regulation according to claim 1, is characterized in that: the driving motor enables the compressor unit to achieve 60% -100% output air quantity regulation under the control and regulation of the rotating speed of the PLC control system.
3. The two-stage compressor unit capable of stepless air quantity regulation according to claim 1, is characterized in that: the control valve is an electromagnetic valve, and two ends of the electromagnetic valve are connected with the clearance cylinder and the primary cylinder through flanges.
4. A two-stage compressor train with stepless capacity regulation according to claim 3, characterized in that: when the electromagnetic valve is opened, the clearance cylinder is communicated with the primary cylinder, and under the combined action of the clearance cylinder and the driving motor, the compressor unit can achieve 40% -100% output air quantity regulation.
5. The two-stage compressor unit capable of stepless air quantity regulation according to claim 1, is characterized in that: and the primary air valve jacking device and the secondary air valve jacking device completely jack the primary cover side air inlet valve and the secondary cover side air inlet valve when in work.
6. The two-stage compressor unit capable of stepless air quantity regulation according to claim 1, is characterized in that: the PLC control system can realize the adjustment of the gas output of the compressor unit between 30% and 100% by changing the rotating speed of the driving motor, opening the control valve to communicate the clearance cylinder with the primary cylinder and controlling the primary air valve jacking device and the secondary air valve jacking device to completely jack the primary cover side gas inlet valve and the secondary cover side gas inlet valve.
7. The two-stage compressor unit capable of stepless air quantity regulation according to claim 1, is characterized in that: the driving motor, the clearance cylinder, the primary air valve jacking device and the secondary air valve jacking device are sequentially used for participating in output air quantity regulation, and the driving motor, the clearance cylinder, the primary air valve jacking device and the secondary air valve jacking device are sequentially used for driving the air valve to move upwards and downwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022186025.9U CN214196588U (en) | 2020-09-29 | 2020-09-29 | Two-stage compressor unit capable of adjusting stepless air quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022186025.9U CN214196588U (en) | 2020-09-29 | 2020-09-29 | Two-stage compressor unit capable of adjusting stepless air quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214196588U true CN214196588U (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022186025.9U Expired - Fee Related CN214196588U (en) | 2020-09-29 | 2020-09-29 | Two-stage compressor unit capable of adjusting stepless air quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214196588U (en) |
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2020
- 2020-09-29 CN CN202022186025.9U patent/CN214196588U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210914 |