CN108317081B - Oil return system of air compressor - Google Patents
Oil return system of air compressor Download PDFInfo
- Publication number
- CN108317081B CN108317081B CN201810308221.3A CN201810308221A CN108317081B CN 108317081 B CN108317081 B CN 108317081B CN 201810308221 A CN201810308221 A CN 201810308221A CN 108317081 B CN108317081 B CN 108317081B
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- Prior art keywords
- oil
- oil return
- machine head
- air compressor
- temperature
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
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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
- F04C28/28—Safety arrangements; Monitoring
-
- 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
- F04C29/02—Lubrication; Lubricant separation
- F04C29/021—Control systems for the circulation of the lubricant
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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
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- 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
Landscapes
- 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)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an oil return system of an air compressor, which comprises a machine head, an oil separator and an oil cooler which are sequentially connected, wherein a first oil return pipeline and a second oil return pipeline are connected between the oil cooler and the machine head; when the air compressor is started, the first oil return pipeline is communicated; when the air compressor is stopped, the first oil return pipeline is disconnected; when the temperature of the machine head is higher than a first set value, the second oil return pipeline is communicated; and when the temperature of the machine head is smaller than a second set value, the second oil return pipeline is disconnected. The oil return system of the air compressor can adjust the oil supply quantity of the machine head according to the temperature of the machine head, and can meet the requirements of high energy efficiency, high reliability and low cost of the air compressor.
Description
Technical Field
The invention relates to the field of air compressors, in particular to an oil return system of an air compressor.
Background
Air compressors are one type of equipment used to compress gas, and are the most common power equipment in industrial and mining enterprises, and can be classified into reciprocating type, screw type and large centrifugal type, wherein the screw compressors are widely used.
Currently, screw compressors are required to meet three requirements: high energy efficiency, high reliability (the temperature of the machine head is required to be less than 95 ℃), low cost (the occupied area of the machine set is required to be as small as possible). In order to meet the requirement of high energy efficiency, the system resistance can be controlled, and the unit oil injection quantity can be reduced; in order to meet the requirement of high reliability, the oil injection quantity is increased or a large cooler is used, but the energy efficiency of the unit is reduced by increasing the oil injection quantity, the size of the unit is increased by using the large cooler, and the cost is correspondingly increased. Therefore, the existing air compressor oil return system cannot simultaneously meet the three requirements, the existing air compressor still adopts the requirements of reducing the oil injection quantity and the size of a cooler so as to meet the requirements of high energy efficiency and low cost, but cannot meet the requirements of controlling the temperature of a machine head below 95 ℃ in a high-temperature environment, the temperature of the machine head is too high, the service life of lubricating oil is shortened, the oil content of compressed air is high, and a bearing is easy to damage.
Aiming at the problems existing in the prior art, the novel oil return system of the air compressor has important significance.
Disclosure of Invention
In order to solve the problems, the invention provides an oil return system of an air compressor, which can adjust the oil supply quantity of the air compressor according to the temperature of the air compressor, and can meet the requirements of high energy efficiency, high reliability and low cost of the air compressor.
In order to achieve the purpose, the oil return system of the air compressor comprises a machine head, an oil separator and an oil cooler which are sequentially connected, wherein a first oil return pipeline and a second oil return pipeline are connected between the oil cooler and the machine head;
when the air compressor is started, the first oil return pipeline is communicated; when the air compressor is stopped, the first oil return pipeline is disconnected;
When the temperature of the machine head is higher than a first set value, the second oil return pipeline is communicated; and when the temperature of the machine head is smaller than a second set value, the second oil return pipeline is disconnected.
Preferably, the first oil return pipeline is provided with an oil break valve for controlling the on-off of the first oil return pipeline.
Further, the oil-break valve is a mechanical oil-break valve.
Preferably, a control valve for controlling the on-off of the second oil return pipeline is arranged on the second oil return pipeline, a temperature sensor for detecting the temperature of the machine head is arranged on the machine head, a controller is connected between the control valve and the temperature sensor, and the controller can control the on-off of the control valve according to a temperature signal output by the temperature sensor.
Further, the control valve is an electric control valve or a pneumatic control valve.
Preferably, a temperature control valve is arranged between the oil separator and the oil cooler, the temperature control valve is provided with an oil inlet and two oil outlets, the oil inlet of the temperature control valve is connected with the oil outlet of the oil separator, one oil outlet of the temperature control valve is connected with the oil inlet of the oil cooler, and the other oil outlet is connected with the machine head.
Preferably, an oil filter is arranged between the oil cooler and the handpiece.
Preferably, the air compressor is a screw compressor.
Compared with the prior art, the oil return system of the air compressor has the beneficial effects that:
1. the second oil return pipeline and the control valve are added, so that the air compressor can adjust the oil supply quantity of the machine head at any time according to the temperature of the machine head, the temperature of the machine head is prevented from being too high, and the requirements of high energy efficiency, high reliability and low cost are met;
2. By arranging the oil-break valve, lubricating oil can be prevented from flowing to the machine head when the air compressor is stopped, so that the screw is prevented from being soaked in the cooled lubricating oil for a long time;
3. By arranging the temperature control valve, lubricating oil can enter the machine head without passing through the oil cooler when the temperature of the lubricating oil is lower, so that energy is saved;
4. by arranging the oil filter, the blockage of the oil cut-off valve and the control valve can be avoided, so that the oil supply quantity of the machine head is ensured, and the cooling effect of the machine head is ensured.
Drawings
Fig. 1 is a system flow chart of an oil return system of an air compressor of the present invention.
Detailed Description
The structure and operation of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, taking a screw compressor as an example, an oil return system of the air compressor comprises a machine head 1, an oil separator 2 and an oil cooler 4 which are sequentially connected, wherein a first oil return pipeline 6 and a second oil return pipeline 7 are connected between the oil cooler 4 and the machine head 1. The first return line 6 and the second return line 7 are both in direct communication with the rotor chamber of the handpiece 1. The oil-gas mixture from the machine head 1 firstly enters the oil separator 2 for oil-gas separation, the lubricating oil separated by the oil separator 2 enters the oil cooler 4 for cooling, and the cooled lubricating oil returns to the rotor cavity of the machine head 1 through the first oil return pipeline 6 and the second oil return pipeline 7.
The first oil return pipeline 6 can control the on-off of a system oil way according to the start-stop of the air compressor, so that lubricating oil still flows to the machine head 1 at the moment of the air compressor is stopped, and the screw is prevented from being soaked in the cooled lubricating oil for a long time. Specifically, when the air compressor is started, the first oil return pipeline 6 is connected, and lubricating oil from the oil cooler 4 can flow to the machine head 1 through the first oil return pipeline 6; when the air compressor is stopped, the first oil return pipeline 6 is disconnected, and lubricating oil from the oil cooler 4 cannot flow to the machine head 1.
As an alternative, a shut-off valve 8 for controlling the switching of the first return line 6 may be provided on the first return line 6. The oil-break valve 8 has two kinds of electromagnetic oil-break valve and mechanical oil-break valve, wherein, the electromagnetic oil-break valve 8 has poor reliability and short service life, and is easy to generate misoperation, therefore, the oil return system of the air compressor adopts the mechanical oil-break valve, and the oil-break valve 8 can timely and accurately supply oil and break oil into the machine head 1, and can adopt the pneumatic mechanical oil-break valve disclosed in Chinese patent publication No. CN201751640U or adopt the oil-break valve 8 for the screw air compressor disclosed in Chinese patent publication No. CN 202927443U. The oil-break valve 8 is provided with an air inlet, an oil inlet and an oil outlet, the air inlet of the oil-break valve 8 is connected with the air outlet of the machine head 1, the oil inlet of the oil-break valve 8 is connected with the oil outlet of the oil cooler 4, and the oil outlet of the oil-break valve 8 is connected with the machine head 1. When the air compressor is started, compressed air generated by the start-up of the air compressor enters the oil-break valve 8 through an air inlet of the oil-break valve 8, an oil inlet and an oil outlet of the oil-break valve 8 are communicated under the pressure action of the compressed air, and lubricating oil in the first oil return pipeline 6 flows to the machine head 1 through the oil outlet of the oil-break valve 8; when the air compressor is stopped, no compressed air enters the oil cut-off valve 8 through the air inlet of the oil cut-off valve 8, so that the oil inlet and the oil outlet of the oil cut-off valve 8 are not communicated, and lubricating oil in the first oil return pipeline 6 cannot flow to the machine head 1.
The second oil return pipeline 7 can adjust the oil supply quantity of the machine head 1 according to the temperature of the machine head 1, so that the temperature of the machine head 1 is controlled at a proper temperature. In the operation process of the air compressor, the temperature of the machine head 1 is continuously increased, especially in a high-temperature environment, the temperature of the machine head 1 is far more than 95 ℃, at the moment, the oil supply quantity of the first oil return pipeline 6 cannot meet the requirement, a series of problems caused by the fact that the temperature of the machine head 1 is too high are generated, at the moment, the oil supply quantity of the machine head 1 can be increased by connecting the second oil return pipeline 7, the temperature of the machine head 1 is reduced, and the reliability of a unit is improved. Specifically, when the temperature of the handpiece 1 is greater than the first set value, the second return line 7 is turned on; when the temperature of the machine head 1 is reduced to be smaller than a second set value, the second oil return pipeline 7 is disconnected, and the oil supply quantity of the machine head 2 is reduced, so that the energy efficiency of the machine set is improved.
As a way, a control valve 9 for controlling the on-off of the second oil return pipeline 7 can be arranged on the second oil return pipeline 7, meanwhile, a temperature sensor (not shown in the figure) for detecting the temperature of the machine head 1 is arranged on the machine head 1, a controller 10 is connected between the control valve 9 and the temperature sensor, the controller 10 can control the opening and the closing of the control valve 9 according to a temperature signal output by the temperature sensor, namely, when the temperature of the machine head 1 is greater than a first set value, the controller 10 controls the control valve 9 to be opened so as to switch on the second oil return pipeline 7; when the temperature of the head 1 decreases to less than the second set value, the controller 10 controls the control valve 9 to open to disconnect the second oil return line 7. The first setting value and the second setting value can be set according to the actual condition and the requirement of the unit, for example, the first setting value is selected to be 93 degrees, and the second setting value is selected to be 88 degrees.
The control valve 9 may be an electric control valve or a pneumatic control valve, and since the pneumatic control valve has a complicated pipeline, the control valve 9 of the oil return system of the air compressor of the present invention is preferably an electric control valve, for example, a two-position two-way electromagnetic valve.
Because the temperature of lubricating oil in the system is lower in the initial stage of starting the air compressor, the oil cooler 4 is not required to cool the lubricating oil, if the lubricating oil with lower temperature enters the machine head 1 after being cooled by the oil cooler 4, condensed water is easy to occur in the machine set system due to the fact that the temperature of the lubricating oil is too low, and therefore, in order to avoid the condensed water and save energy, a temperature control valve 3 is arranged between the oil cooler 4 and the oil separator 2, the temperature control valve 3 is provided with an oil inlet and two oil outlets, the oil inlet of the temperature control valve 3 is connected with the oil outlet of the oil separator 2, one oil outlet of the temperature control valve 3 is connected with the oil inlet of the oil cooler 4, and the other oil outlet is connected with the machine head 1. The thermo valve 3 can determine whether the lubricating oil needs to be cooled or not according to the temperature of the lubricating oil coming out of the oil separator 2. When the oil inlet temperature of the temperature control valve 3 reaches the set temperature of the temperature control valve 3, an oil outlet connected with the temperature control valve 3 and the oil cooler 4 is opened, and at the moment, lubricating oil enters the oil cooler 4 for cooling and then enters the machine head 1; when the oil inlet temperature of the temperature control valve 3 does not reach the set temperature of the temperature control valve 3, the oil outlet connected with the machine head 1 by the temperature control valve 3 is opened, and at the moment, lubricating oil can directly enter the machine head 1.
In the operation process of the air compressor, a small part of impurities in the air are inevitably mixed into the lubricating oil, and when the impurities flow through the oil-break valve 8 and the control valve 9, the impurities possibly cause precipitation blockage, so that the oil-break valve 8 cannot be opened along with the starting of the air compressor, and the control valve 9 cannot be opened in time and is in a closed or semi-closed state, so that the flow rate of the lubricating oil is reduced, and the cooling effect of the air compressor head 1 is seriously affected, therefore, as a further improvement, an oil filter 5 is arranged between the oil cooler 4 and the air compressor head 1, specifically, the oil filter 5 is arranged between the oil cooler 4 and the oil-break valve 8 and between the oil-break valve 9, and can filter the lubricating oil to ensure the oil supply quantity of the air compressor head 1, thereby ensuring the normal operation of the air compressor and prolonging the service life of the air compressor.
The above is only a schematic description of the present invention, and it should be appreciated by those skilled in the art that many modifications can be made to the present invention without departing from the working principles of the present invention, which falls within the scope of the present invention.
Claims (5)
1. The oil return system of the air compressor comprises a machine head, an oil separator and an oil cooler which are sequentially connected, and is characterized in that a first oil return pipeline and a second oil return pipeline are connected between the oil cooler and the machine head, the first oil return pipeline is used for controlling the on-off of the first oil return pipeline according to the start-stop state of the air compressor, and the second oil return pipeline is used for adjusting the oil supply quantity of the machine head according to the temperature of the machine head so as to control the temperature of the machine head;
when the air compressor is started, the first oil return pipeline is communicated; when the air compressor is stopped, the first oil return pipeline is disconnected;
When the temperature of the machine head is higher than a first set value, the second oil return pipeline is communicated; when the temperature of the machine head is smaller than a second set value, the second oil return pipeline is disconnected; wherein,
The first oil return pipeline is provided with an oil break valve for controlling the on-off of the first oil return pipeline;
The second oil return pipeline is provided with a control valve for controlling the on-off of the second oil return pipeline, the machine head is provided with a temperature sensor for detecting the temperature of the machine head, a controller is connected between the control valve and the temperature sensor, and the controller can control the opening and the closing of the control valve according to a temperature signal output by the temperature sensor;
A temperature control valve is arranged between the oil separator and the oil cooler, the temperature control valve is provided with an oil inlet and two oil outlets, the oil inlet of the temperature control valve is connected with the oil outlet of the oil separator, one oil outlet of the temperature control valve is connected with the oil inlet of the oil cooler, and the other oil outlet is connected with the machine head.
2. The oil return system of an air compressor of claim 1, wherein the oil shutoff valve is a mechanical oil shutoff valve.
3. The oil return system of the air compressor as set forth in claim 1, wherein the control valve is an electric control valve or a pneumatic control valve.
4. The oil return system of an air compressor as set forth in claim 1, wherein an oil filter is provided between the oil cooler and the head.
5. The oil return system of an air compressor of claim 1, wherein the air compressor is a screw compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810308221.3A CN108317081B (en) | 2018-04-08 | 2018-04-08 | Oil return system of air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810308221.3A CN108317081B (en) | 2018-04-08 | 2018-04-08 | Oil return system of air compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108317081A CN108317081A (en) | 2018-07-24 |
| CN108317081B true CN108317081B (en) | 2024-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810308221.3A Active CN108317081B (en) | 2018-04-08 | 2018-04-08 | Oil return system of air compressor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253464A (en) * | 2020-11-12 | 2021-01-22 | 意朗实业（上海）有限公司 | Oil path control device, screw compressor system and oil path control method |
| CN115434912A (en) * | 2022-09-15 | 2022-12-06 | 广东艾高装备科技有限公司 | Dual logic temperature and pressure dynamic monitoring method |
| CN115949589B (en) * | 2023-02-15 | 2025-01-24 | 阿特拉斯·科普柯(无锡)压缩机有限公司 | Oil injection system, control method and related device for compressor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454536A (en) * | 2014-10-29 | 2015-03-25 | 复盛实业(上海)有限公司 | Method and system for adjusting oil amount, controller and oil-injected screw compressor |
| CN106382769A (en) * | 2016-11-11 | 2017-02-08 | 珠海格力电器股份有限公司 | Compressor system and compressor control method |
| CN208123066U (en) * | 2018-04-08 | 2018-11-20 | 阿特拉斯·科普柯(无锡)压缩机有限公司 | The oil return system of air compressor machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306981A (en) * | 2012-03-12 | 2013-09-18 | 上海斯可络压缩机有限公司 | Double-screw air compressor |
| JP6000108B2 (en) * | 2012-12-17 | 2016-09-28 | 三菱電機株式会社 | Oil return circuit and air compression apparatus provided with the same |
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2018
- 2018-04-08 CN CN201810308221.3A patent/CN108317081B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454536A (en) * | 2014-10-29 | 2015-03-25 | 复盛实业(上海)有限公司 | Method and system for adjusting oil amount, controller and oil-injected screw compressor |
| CN106382769A (en) * | 2016-11-11 | 2017-02-08 | 珠海格力电器股份有限公司 | Compressor system and compressor control method |
| CN208123066U (en) * | 2018-04-08 | 2018-11-20 | 阿特拉斯·科普柯(无锡)压缩机有限公司 | The oil return system of air compressor machine |
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| CN108317081A (en) | 2018-07-24 |
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