CN110939557A - Compressor flow regulating mechanism and method - Google Patents
Compressor flow regulating mechanism and method Download PDFInfo
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- CN110939557A CN110939557A CN201911282965.3A CN201911282965A CN110939557A CN 110939557 A CN110939557 A CN 110939557A CN 201911282965 A CN201911282965 A CN 201911282965A CN 110939557 A CN110939557 A CN 110939557A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention discloses a flow regulating mechanism and a flow regulating method for a compressor, which comprise a compressor cylinder body; the compressor cylinder body is internally provided with a working volume; the compressor cylinder body is provided with a plurality of valve cavities for mounting air valves; one or more of the valve cavities are provided with clearance cylinders; the clearance barrel is a barrel with an opening at one end; the opening end of the clearance barrel is communicated with the working volume of the compressor cylinder body; the closed end of the clearance barrel seals the working volume of the compressor cylinder body from the outside. The invention relates to a flow regulating mechanism of a compressor, which has a structure that a cylinder is provided with more than two air valves with the same name, one or more than two air valves are reserved for normal air suction and exhaust, one or two air valves of the volume at one side of the cylinder are removed, and a cavity is vacated for installing a clearance barrel; the invention effectively solves the technical problem of flow regulation of the compressor by utilizing the redundant air inlet and outlet valves.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a flow regulating device and method for a compressor.
Background
The large petrochemical and chemical compressors often adopt a full-stroke pressure-opening air suction valve and a partial-stroke pressure-opening air suction valve to adjust the air displacement. The adjustment mode of the full-stroke pressure-opening air suction valve only can enable the displacement of the adjusted cylinder to be zero or one hundred percent, and the requirements of most users cannot be met; currently, the adjustment of the partial piston stroke pressure-open intake valve is considered to be the most advanced exhaust amount adjustment technique. However, the adjustment structure is complex and expensive, and each piston reciprocates to perform the opening and closing actions, which is likely to cause damage and failure of the actuator or the air valve. In addition, the adjustment mechanism draws gas into the cylinder during intake and discharges the drawn gas from the intake valve during compression, and the high-speed flow of gas repeatedly through the gas valve passage causes large flow losses and energy consumption. Only a small number of petrochemical compressors have such displacement adjusting mechanisms installed thereon.
The use of increasing and decreasing head end clearance volume to regulate displacement is a very economical way of flow regulation. However, the clearance adjusting mechanism of the movable cylinder seat cannot be adopted for the working volume of the shaft side cylinder, so that the adjusting range and the application object of the clearance volume adjusting exhaust volume of one compressor are greatly limited.
Disclosure of Invention
The present invention provides a flow rate adjusting mechanism and method for a compressor to solve the above-mentioned problems.
The compressor flow regulating mechanism comprises a compressor cylinder body; the compressor cylinder body is internally provided with a working volume; the compressor cylinder body is provided with a plurality of valve cavities for mounting air valves; one or more of the valve cavities are provided with clearance cylinders; the clearance barrel is a barrel with an opening at one end; the opening end of the clearance barrel is communicated with the working volume of the compressor cylinder body; the closed end of the clearance barrel seals the working volume of the compressor cylinder body from the outside.
Further, the air valve is an air suction valve or an air exhaust valve.
Furthermore, a spigot boss is arranged on the outer side of the opening at the lower part of the clearance barrel and is matched and positioned with a spigot of an installation boss corresponding to the valve cavity and used for installing the air valve, an O-shaped sealing ring is arranged on the outer wall of the spigot boss at the opening at the lower part of the clearance barrel and is in sealing fit with the spigot of the installation boss used for installing the air valve in the valve cavity, and the clearance barrel is isolated from the original air inlet and exhaust passages of the valve cavity.
Furthermore, a flange plate is arranged on the outer side of the clearance cylinder body, and the flange plate is fixedly connected with a valve cover spigot of the cylinder body through a bolt.
Further, the clearance barrel is of an integrated structure or a split structure.
Further, the clearance volume in the clearance barrel is fixed.
Further, the clearance barrel is adjustable in clearance volume; a hydraulic piston for changing the clearance volume is mounted in the clearance cylinder.
Further, a clearance barrel cover plate (10) is fixed on the clearance barrel; a liquid input pipeline and a liquid output pipeline are arranged on the clearance barrel cover plate; the liquid input pipeline and the liquid output pipeline are externally connected with a stop valve and a fluid pump; the original displacement of the compressor is Q0After the adjustment of the clearance volume, Q is reached1，
Then, an increased clearance volume V is required0' is:
in the formula, Q1The required displacement, m, after increasing the clearance3/min；
Q0Original displacement of the compressor, m3/min；
VhThe stroke volume of the cylinder, m3；
V0The original clearance volume of the cylinder, m3；
Epsilon is the intake-exhaust pressure ratio of the cylinder;
m is gas expansion process index;
V0' -amount of clearance volume to be increased, m3。
A method of regulating compressor flow, comprising: a working volume is provided in the compressor cylinder body; the compressor cylinder body is provided with a plurality of valve cavities for mounting air valves; one or more of the air valves are removed, and a clearance barrel is arranged in the valve cavity after the air valves are removed; compressor flow is regulated by the volume within the clearance barrel.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a flow regulating mechanism of a compressor, which has a structure that a cylinder is provided with more than two air valves with the same name, one or more than two air valves are reserved for normal air suction and exhaust, one or two air valves of the volume at one side of the cylinder are removed, and a cavity is vacated for installing a clearance barrel; the invention effectively solves the technical problem of flow regulation of the compressor by utilizing the redundant air inlet and outlet valves.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a layout view of multiple rows of compressor cylinders and their valves;
FIG. 2 is a diagram of the relative positions of the cylinder, valve and valve cavity of the compressor;
FIG. 3(a) is a schematic view of the installation structure of the air valve of the compressor; FIG. 3(b) is a schematic view of the valve chamber with the gas valve removed;
FIG. 4 is a schematic view of the mounting structure of the clearance volume fixing adjustment cylinder;
FIG. 5 is a schematic view of the installation of the variable clearance volume adjustment cylinder.
01-clearance barrel; 02-connecting bolts; 03-cylinder block (valve cavity wall); 04-O type sealing ring; 07-a hydraulic piston; 08-liquid input line; 09-liquid outlet line; 10-clearance bowl cover plate; 11-clearance barrel; 12-clearance barrel attachment bolts; 13-a cylinder body; 14-O-ring seals; 15-hydraulic chamber; 16-clearance cavity; 21-first-stage cylinder, 22-second-stage cylinder, 23-third-stage cylinder, 24-fourth-stage cylinder, 25-fifth-stage cylinder, 26,27,28 and 29-air valve; 31-cylinder working volume, 32-suction valve, 34-suction valve cavity, 35-exhaust valve and 36-exhaust valve cavity; 41-air valve; 42-valve cavity.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Considering that when the air displacement of the compressor needs to be adjusted, the air suction valve and the air discharge valve of the compressor have redundancy in different degrees, and more than two air suction valves or air discharge valves are arranged on the cover side or the shaft side of most compressor cylinders, then at least one air valve can be removed, the valve cavity provided with the air valve is modified into the clearance volume of the cylinder, and the adjustment of the air displacement within the range of 40-90% is realized. The flexibility of application is big, does not receive the restriction of cylinder head side or axle side. The invention provides an exhaust volume adjusting structure with a valve cavity as a clearance volume. As shown in fig. 1, the multi-row cylinder compressor with five-stage compression has more than two suction valves and exhaust valves in the same volume of the front four-stage cylinder except the last stage, i.e. each working volume can be provided with at least one air valve cavity for installing a clearance volume adjusting cylinder; for the last stage of regulation, flow regulation by pressure-opening the suction valve can be used, in combination with the clearance regulation according to the invention.
As shown in fig. 2, for the working volume 31 of the compressor cylinder required to perform flow regulation, the working volume is provided with more than two suction valves 32 and more than two exhaust valves 35, one suction valve in a suction valve cavity 34 or one exhaust valve in an exhaust valve cavity 36 on the compressor cylinder is removed, or both the suction valve and the exhaust valve are removed, the emptied valve cavity is shown as fig. 3(b), a clearance barrel 01 shown as fig. 4 is installed in one or two emptied valve cavities, or a clearance barrel 11 shown as fig. 5 is installed, and is used as a clearance volume for regulating the exhaust amount; the lower portion of the clearance cylinder communicates with the inner cavity of the cylinder block 13. Other parts of the clearance barrel 01/11 are all closed, the outside of the opening at the lower part of the clearance barrel is provided with a spigot boss which is matched and positioned with the spigot of the original mounting boss of the air valve, and the spigot is provided with an O-shaped sealing ring 04/14 which is used for isolating the clearance barrel from the original air inlet and exhaust channel of the valve cavity.
The clearance barrel is provided with a flange on the outer side and is connected with a valve cover spigot of the cylinder body 13 through a bolt 02/12. A proper gap is reserved between the lower spigot of the clearance barrel and the mounting spigot of the raw air valve, and interference between the lower spigot of the clearance barrel and the mounting spigot of the air valve is avoided after the clearance barrel flange is fastened with the valve hole flange of the air cylinder.
The volume of the clearance cylinder 01 shown in fig. 4 is fixed and only the exhaust volume adjustment within a fixed range is adapted. Fig. 5 shows a clearance-variable volume adjusting structure using a valve cavity volume, wherein a hydraulic piston 07 is installed in a clearance cylinder 11, and a clearance cylinder cover plate 10 is fixed on the clearance cylinder 11 through a clearance cylinder connecting bolt; a liquid input pipeline 08 and a liquid output pipeline 09 are arranged on the clearance barrel cover plate 10; the liquid inlet line 08 and the liquid outlet line 09, which connect the shut-off valve and the fluid pump, supply and discharge fluid into the hydraulic chamber 15 as required to adjust the flow rate of the cylinder, in order to reduce and enlarge the volume of the clearance chamber 16 below the hydraulic piston 07. If the original displacement of the compressor is Q0After the adjustment of the clearance volume, Q is reached1，
Then, an increased clearance volume V is required0' is:
in the formula, Q1The required displacement, m, after increasing the clearance3/min；
Q0Original displacement of the compressor, m3/min；
VhThe stroke volume of the cylinder, m3；
V0The original clearance volume of the cylinder, m3；
Epsilon is the intake-exhaust pressure ratio of the cylinder;
m is gas expansion process index;
V0' -volume within the figure clearance cylinder.
For any compressor cylinder, as long as the cylinder shaft side or the cylinder cover side is provided with more than two valves (suction valves or exhaust valves) with the same name, the clearance volume flow regulating mechanism can be adopted, according to the design rule of the compressor, the volume of one side of the cylinder of the low-pressure-level single-stage or multi-stage cylinder is always provided with more than two valves with the same name, and the number of valve cavities is selected according to the requirement of the volume of flow regulation capacity. If the adjusted air flow is about 40-70% of the total flow, more than two air valve cavities are needed on the same side of the cylinder, so that one air suction valve cavity or one air exhaust valve cavity on the cylinder can be used as a clearance volume adjusting cavity; if the required regulation flow rate reaches 70-90% of the total flow rate, more than three air valves with the same name are required to be arranged in the working volume on one side of the air cylinder, and then one air suction valve or one air discharge valve cavity can be used as a clearance cylinder body regulation cavity.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (9)
1. The flow regulating mechanism of the compressor is characterized by comprising a compressor cylinder body;
the compressor cylinder body (13) is internally provided with a working volume (31); a plurality of valve cavities (42) for installing air valves are arranged on the compressor cylinder body (13); mounting clearance cylinders in one or more of the valve cavities (42);
the clearance barrel is a barrel with an opening at one end; the opening end of the clearance barrel is communicated with the working volume (31) of the compressor cylinder body; the closed end of the clearance barrel seals the working volume (31) of the compressor cylinder body from the outside.
2. The compressor flow adjustment mechanism of claim 1, wherein the gas valve is a suction valve or a discharge valve.
3. The flow regulating mechanism of the compressor as claimed in claim 1, wherein the outer side of the lower opening of the clearance cylinder is provided with a spigot boss which is matched and positioned with a spigot of a mounting boss corresponding to the valve chamber (42) for mounting the air valve, the outer wall of the spigot boss at the lower opening of the clearance cylinder is provided with an O-shaped sealing ring, and the O-shaped sealing ring is in sealing fit with the spigot of the mounting boss for mounting the air valve in the valve chamber (42) to isolate the clearance cylinder from the original air inlet and outlet passages of the valve chamber.
4. A flow regulating mechanism of a compressor according to claim 1, characterized in that a flange is provided on the outer side of the clearance cylinder, and the flange is fixedly connected with a valve cover spigot of the cylinder block (13) by a bolt.
5. The compressor flow adjustment mechanism of claim 1, wherein the clearance barrel is of a one-piece or a split construction.
6. The compressor flow adjustment mechanism of claim 1, wherein the clearance volume in the clearance barrel is fixed.
7. The compressor flow adjustment mechanism of claim 1, wherein the clearance barrel is adjustable for clearance volume; a hydraulic piston (07) for changing the clearance volume is mounted in the clearance cylinder.
8. Compressor flow according to claim 1The adjusting mechanism is characterized in that a clearance barrel cover plate (10) is fixed on the clearance barrel; a liquid input pipeline (08) and a liquid output pipeline (09) are arranged on the clearance barrel cover plate (10); the liquid input pipeline (08) and the liquid output pipeline (09) are externally connected with a stop valve and a fluid pump; the original displacement of the compressor is Q0After the adjustment of the clearance volume, Q is reached1，
Then, an increased clearance volume V is required0' is:
in the formula, Q1The required displacement, m, after increasing the clearance3/min；
Q0Original displacement of the compressor, m3/min；
VhThe stroke volume of the cylinder, m3；
V0The original clearance volume of the cylinder, m3；
Epsilon is the intake-exhaust pressure ratio of the cylinder;
m is gas expansion process index;
V0' -amount of clearance volume to be increased, m3。
9. A compressor flow rate adjusting method, characterized in that the compressor flow rate adjusting mechanism according to any one of claims 1 to 8, comprises:
a displacement volume (31) in the compressor cylinder body (13); the compressor cylinder body (13) is internally provided with a plurality of valve cavities (42) for mounting air valves; one or more of the air valves are removed, and a clearance barrel is arranged in the valve cavity after the air valves are removed; compressor flow is regulated by the volume within the clearance barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282965.3A CN110939557B (en) | 2019-12-13 | 2019-12-13 | Compressor flow regulating mechanism and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282965.3A CN110939557B (en) | 2019-12-13 | 2019-12-13 | Compressor flow regulating mechanism and method |
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| Publication Number | Publication Date |
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| CN110939557A true CN110939557A (en) | 2020-03-31 |
| CN110939557B CN110939557B (en) | 2021-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153720A (en) * | 2021-04-14 | 2021-07-23 | 武汉理工大学 | Compressor economizer based on discharge valve clearance is adjusted |
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| CN102562547A (en) * | 2012-02-06 | 2012-07-11 | 武汉理工大学 | Stepless airflow regulation method for high-pressure reciprocating compressor |
| CN203130454U (en) * | 2013-03-04 | 2013-08-14 | 武汉理工大学 | Air volume stepless regulation mechanism of reciprocating piston compressor |
| WO2017060253A1 (en) * | 2015-10-09 | 2017-04-13 | Nuovo Pignone Tecnologie Srl | A reciprocating compressor |
| CN209228588U (en) * | 2018-08-28 | 2019-08-09 | 沈阳远大压缩机自控系统有限公司 | Reciprocating compressor automatic electric drives full flow clearance stepless regulating system |
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2019
- 2019-12-13 CN CN201911282965.3A patent/CN110939557B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562547A (en) * | 2012-02-06 | 2012-07-11 | 武汉理工大学 | Stepless airflow regulation method for high-pressure reciprocating compressor |
| CN203130454U (en) * | 2013-03-04 | 2013-08-14 | 武汉理工大学 | Air volume stepless regulation mechanism of reciprocating piston compressor |
| WO2017060253A1 (en) * | 2015-10-09 | 2017-04-13 | Nuovo Pignone Tecnologie Srl | A reciprocating compressor |
| CN209228588U (en) * | 2018-08-28 | 2019-08-09 | 沈阳远大压缩机自控系统有限公司 | Reciprocating compressor automatic electric drives full flow clearance stepless regulating system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113153720A (en) * | 2021-04-14 | 2021-07-23 | 武汉理工大学 | Compressor economizer based on discharge valve clearance is adjusted |
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