An air entrainment device for small heavy oil rotary engines

Abstract

The invention discloses a kind of air injection device for small heavy oil rotor engine, belong to engine fuel supply field.The invention includes oil-gas separator, oil pump, pressure regulating valve, air nozzle, air pump, connecting block, oil pipe and oil tank.The connecting block is composed of oil inlet, oil return port, flow sensor, electromagnetic controller, pressure regulating valve, air inlet, pressure relief port and exhaust port.The connecting block is used for oil-gas transportation, maintains the constant pressure difference of oil-gas two-phase.Open three air ports, make oil-gas regulation become more sensitive.Through the pressure feedback of oil-gas two-way, reduce the mechanism at the two ends of oil-gas path, ensure the stable pressure difference of gas path and oil path respectively through the adjusting effect of pressure regulating valve, realize the accurate injection quantity control, improve the performance and working reliability of heavy oil rotor engine.The invention directly uses flow sensor and pressure regulating valve to control oil path flow by connecting block, saves the space of fuel metering nozzle, makes the structure of air injection device more compact.

Description

TECHNICAL FIELD

[0001] The application relates to an air entraining device applied to a small heavy oil rotary engine and belonging to the technical field of engine fuel supply. BACKGROUND

[0002] The rotary engine is restricted by its own structure, and the compression is small, and compared with conventional gasoline, the heavy oil has a small saturated vapor pressure and poor evaporation performance, so it is difficult for the heavy oil to reach the ignition condition at the top dead center of the rotary engine. The air entraining device mainly uses air to assist in fuel atomization, reduces the average liquid droplet particle size of fuel particles, and improves the top dead center condition during cold start of the engine, so the air entraining device is applied to the rotary engine and becomes a development trend.

[0003] The rotary engine has a high running speed, which causes pressure fluctuation of the air path in the air entraining system, and the additional pressure wave makes it difficult to accurately control the fuel injection amount; the small rotary engine requires concealment, and the air entraining device applied to the ordinary piston engine is large in size, and the excessive load further reduces the power and economy of the engine.

[0004] Current researches on the air entraining device mainly focus on the atomization characteristics and mechanism, but ignore the research on the applicability of the air entraining device to the engine. Therefore, it is of great significance to design a light air entraining device for a small engine, which meets the requirements of accurate fuel injection amount and atomization effect. SUMMARY

[0005] In view of the problems that the air entraining device is large in size and the accurate fuel injection amount is difficult to control, the application mainly aims to provide an air entraining device for a small heavy oil rotary engine, through pressure feedback of oil and gas two paths, two end mechanisms of the oil and gas paths are reduced, through the adjusting effect of the pressure regulating valve, stable pressure differences of the gas path and the oil path are ensured respectively, accurate fuel injection amount control is realized, the performance and working reliability of the heavy oil rotary engine are improved, and the air entraining device has the advantages of small structure size and light mass.

[0006] The application aims to realize the following technical scheme:

[0007] The application discloses a gas injection device for a small heavy oil rotary engine, which comprises an oil-gas separator, an oil pump, a connecting block, an air pump, an oil tank and an air nozzle. The connecting block is used for oil-gas transportation and maintaining a constant pressure difference between the oil and gas, and is composed of an oil inlet, an oil outlet, a flow sensor, an electromagnetic controller, a pressure regulating valve chamber, an air inlet, a pressure relief port, a first exhaust port, a second exhaust port, an oil return port and an electronic control unit (ECU). High-pressure fuel enters the oil channel from the oil inlet and directly enters the air nozzle from the oil outlet. In order to ensure the safety requirement of the engine, the opening size of the oil return port is controlled by the electromagnetic controller, and when the engine is urgently stopped, the oil return port is opened to exhaust the fuel in the connecting block. Meanwhile, the flow sensor is installed at the oil inlet, and the ECU is used to record the oil channel flow, which is beneficial to realize the matching of the fuel injection device and the engine power characteristics. The cross-sectional area of the oil channel increases first and then decreases from top to bottom, the pressure loss generated at the cross-sectional area is used to increase the kinetic energy of the fuel and improve the fuel atomization quality. After the compressed gas passes through the air inlet, it directly enters the air nozzle through the exhaust port. The pressure relief port is used to ensure that the high-pressure air not discharged in time after the gas circuit is used does not cause damage to the strength of the connecting block cavity. The pressure regulating valve chamber is used as a connecting medium of the oil-gas circuit and is used to realize the mutual transmission of the oil-gas circuit pressure. The pressure regulating valve comprises an electromagnetic coil, a magnetic block spring piece, an air port, a spring, an oil inlet, an oil return port, a magnetic block and a pressure sensor. The air port is used to provide an inlet for the compressed gas in the pressure regulating valve chamber. In order to ensure sufficient flow into the air port, three air ports are opened, the flow area of the compressed gas is increased, the oil-gas regulation becomes more sensitive, and the time required for pressure wave transmission is reduced. The strength of the current of the electromagnetic coil is controlled by the electronic control unit (ECU), which causes the magnetic block to generate different electromagnetic forces, causes the spring piece to be offset, different spring piece positions affect the volume of the oil-gas chamber in the pressure regulating valve, affects the pressure difference between the oil and gas, the spring piece position is recorded in the ECU through the pressure sensor, thereby flexibly adjusting the electromagnetic force according to the oil-gas two-phase force balance requirement, and meeting the adaptation requirement of the engine and the fuel injection system. When the liquid pressure at the lower end of the spring piece in the pressure regulating valve is too large, the fuel will flow back to the pressure regulating valve chamber of the connecting block from the oil return port. The compressed air provided by the air pump is mixed with the high-pressure fuel in the air nozzle, and the oil-gas mixture is sprayed out of the air nozzle. The oil and gas pressure mutual balance mode is used to reduce the pressure stabilizing device of the oil channel, realize the instant regulation of the oil-gas pressure, integrate the air nozzle, the pressure regulating valve and the connecting block, and greatly reduce the volume of the gas injection device.

[0008] The air port refers to the first air port, the second air port or the third air port of the three air ports.

[0009] The oil return port refers to the first oil return port or the second oil return port of the three oil return ports.

[0010] The oil-gas two-phase force balance requirement is that the spring force F spring , the gravity of the spring piece G and the force F of the compressed gas on the spring piece are balanced.g1 and F g2 and the respective included angles alpha and beta, the pressure F of the fuel on the spring leaf oil and the electromagnetic force F generated by the energized coil electric the resultant force is balanced, wherein the spring force is mainly composed of the spring force F0 of the spring itself and the spring force generated by the pre-compression x.

[0011] F g1 cos alpha + F g2 cos beta + F spring -G-F electric -F oil = 0 (1)

[0012] F g1 sin alpha - F g2 sin beta = 0 (2)

[0013] F spring -F0 + kx = 0 (3)

[0014] The working method of the air clamping injection device applied to the small heavy oil rotary engine is disclosed.

[0015] Before the small heavy oil rotary engine is operated, the pressure relief port at the connecting block is opened, and after the pressure in the air clamping injection device is restored to atmospheric pressure, the pressure relief port is closed. The rotary engine is started, the air clamping injection device is pressurized by using the air pump, the compressed gas partially enters the pressure regulating valve chamber of the connecting block, passes through the first gas port, the second gas port and the third gas port, pushes open the spring and the spring leaf of the pressure regulating valve, and part of the compressed gas directly fills the air nozzle chamber of the connecting block. After the engine maintains a certain determined value according to the instruction, the ECU changes the current in the electromagnetic coil according to the oil supply demand of the engine, and then adjusts the electromagnetic force of the magnet spring leaf, so that the pressure difference between the oil and gas is obtained through the pressure returned by the pressure sensor, and the pressure in the connecting block chamber tends to be stable. When the engine speed changes, the ECU adjusts the current in the electromagnetic coil through the feedback obtained by the pressure sensor, and through the pressure feedback of the oil and gas two-way pressure, the two-way pressure of the oil and gas is reduced, and the stable pressure difference of the air path and the oil path is ensured through the adjusting effect of the pressure regulating valve, so as to realize the precise fuel injection control and match the fuel supply characteristics of the fuel injection device with the speed characteristics of the engine. The fuel stored in the air nozzle chamber realizes the secondary breaking of the liquid droplets by using the scouring disturbance effect of the compressed gas, and then improves the atomization effect and improves the performance and working reliability of the heavy oil rotary engine.

[0016] In order to make the oil channel sudden contraction section have the best fuel kinetic energy lifting effect, as an optimization, the oil channel sudden contraction section adopts an included angle of 60°.

[0017] In order to make the oil and gas pressure regulating feedback more sensitive, as an optimization, the ECU is directly arranged inside the connecting block chamber to improve the reliability.

[0018] In order to ensure the adjustability of the oil-gas pressure difference, preferably, the pressure regulating valve spring material is selected as chromium alloy steel.

[0019] Beneficial effects:

[0020] 1. The air injection device for small heavy oil rotary engine disclosed in the application adopts a connecting block to directly control the oil passage flow by using a flow sensor and a pressure regulating valve, saves the space of the fuel metering nozzle, and makes the air injection device structure more compact.

[0021] 2. The air injection device for small heavy oil rotary engine disclosed in the application controls the strength of the current of the electromagnetic coil by means of the ECU, so that different electromagnetic forces are generated by the magnetic block, the spring plate position is offset, the different spring plate positions affect the different oil-gas chamber volumes in the pressure regulating valve, and the oil-gas two-phase pressure difference is affected, the spring plate position is recorded in the ECU through the pressure sensor, so that the electromagnetic force size can be flexibly adjusted according to the engine demand speed, and the adaptation of the engine and the fuel injection system is met.

[0022] 3. The air injection device for small heavy oil rotary engine disclosed in the application opens three air ports to ensure sufficient inflow of the air port, increases the flow area of the compressed gas, makes the oil-gas regulation more sensitive, and reduces the time spent due to pressure wave transmission.

[0023] 4. The air injection device for small heavy oil rotary engine disclosed in the application has an oil passage that increases in cross-sectional area from top to bottom, utilizes the pressure loss generated at the cross-sectional area to increase the kinetic energy of the fuel, and realizes the secondary breaking of the liquid droplets by the scouring disturbance of the compressed gas, so that the fuel atomization quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole schematic diagram of the air injection device.

[0025] 1 - oil-gas separator, 2 - oil pump, 3 - connecting block, 4 - air pump, 5 - oil tank, 6 - air nozzle, 7 - pressure regulating valve;

[0026] Figure 2 It is a specific structure schematic diagram of the connecting block of the air injection device.

[0027] 3.1 - oil inlet, 3.2 - oil outlet, 3.3 - flow sensor, 3.4 - electromagnetic controller, 3.5 - pressure regulating valve chamber, 3.6 - air inlet, 3.7 - pressure relief port, 3.8 - first air outlet, 3.9 - second air outlet, 3.10 - oil return port, 3.11 - electronic control unit (ECU);

[0028] Figure 3Fig. 1 is a schematic diagram of the structure of the pressure regulating valve device.

[0029] 8 - electromagnetic coil, 9 - magnetic block spring, 10 - air port, 11 - spring, 12 - oil inlet, 13 - oil return port, 14 - magnetic block, 15 - pressure sensor

[0030] Figure 4 Fig. 2 is a schematic diagram of the force on the pressure regulating valve of the air entraining injection device.

[0031] Spring force F spring , spring self-gravity G, force of compressed gas on spring F g1 and F g2 , F g1 and F g2 , the angle α and β between the anti-gravity direction, the pressure of fuel on the spring F oil , electromagnetic force F electric generated by the energized coil. DETAILED DESCRIPTION

[0032] The present application will now be further described in detail with reference to the drawings, which are simplified schematic diagrams and only show the basic structure of the present application in a schematic manner, and therefore only show the components related to the present application.

[0033] Example 1

[0034] As shown in Figure 1 , the air entraining injection device for small heavy oil rotary engine disclosed in the present embodiment comprises an oil-gas separator 1, an oil pump 2, a connecting block 3, an air pump 4, an oil tank 5, an air nozzle 6 and a pressure regulating valve 7. As Figure 2As shown, the connecting block 3 is used for oil and gas transportation, maintaining constant pressure difference of oil and gas two phases, the connecting block 3 is composed of oil inlet 3.1, oil outlet 3.2, flow sensor 3.3, electromagnetic controller 3.4, pressure regulating valve chamber 3.5, air inlet 3.6, pressure relief port 3.7, first exhaust port 3.8, second exhaust port 3.9, oil return port 3.10 and electronic control unit (ECU) 3.11. High pressure fuel enters the oil passage from the oil inlet 3.1, directly enters the gas nozzle 6 from the oil outlet 3.2, in order to ensure the safety requirements of the engine, the opening size of the oil return port 3.10 is controlled by the electromagnetic controller 3.4, when the engine stops running in emergency, the oil return port 3.10 is opened, and the fuel in the connecting block 3 is discharged. At the same time, the flow sensor 3.3 is installed at the oil inlet 3.1, and the ECU 3.11 records the oil passage flow, which is beneficial to realize the matching of the fuel injection device and the engine power characteristics. From top to bottom, the cross-sectional area of the oil passage first increases and then decreases, the pressure loss generated at the cross-sectional area is used to increase the kinetic energy of the fuel, and the fuel atomization quality is improved. The diameter size of the throat of the convergent-divergent tube section is 15mm, the inlet section diameter size is 10mm, and the outlet section size is 8mm. After the compressed gas passes through the air inlet 3.6, it directly enters the gas nozzle 6 through the first exhaust port 3.8 and the second exhaust port 3.9. The pressure relief port 3.7 is used to ensure that the high pressure air not discharged in time after the gas circuit is used will not damage the strength of the connecting block 3 cavity. The pressure regulating valve chamber 3.5 is used as a connecting medium of the oil and gas circuit, for realizing the mutual propagation of the oil and gas circuit pressure. The pressure regulating valve 7 is connected with the pressure regulating valve chamber 3.5 according to aabb interface. As shown, Figure 3 As shown, the pressure regulating valve 7 includes an electromagnetic coil 8, a magnetic block spring 9, an air port 10, a spring 11, an oil inlet 12, an oil return port 13, a magnetic block 14, a pressure sensor 15, the air port is used to provide an inlet for the compressed gas in the pressure regulating valve chamber 3.5, in order to ensure sufficient flow into the air port, three air ports are opened, which are first air port 10.1, second air port 10.2 and third air port 10.3, increase the flow area of the compressed gas, make the oil and gas regulation more sensitive, and reduce the time spent due to pressure wave transmission. The strength of the current of the electromagnetic coil is controlled by the electronic control unit (ECU) 3.11, which will cause the magnetic block 14 to generate different electromagnetic forces, causing the spring 9 to be offset, different spring positions will cause the oil and gas chamber volume in the pressure regulating valve 7 to be different, which will affect the pressure difference of the oil and gas two phases, the spring position will be recorded in the ECU 3.11 through the pressure sensor, so as to flexibly adjust the electromagnetic force according to the oil and gas two phase force balance requirement, meet the adaptation requirement of the engine and the fuel injection system. When the liquid pressure at the lower end of the spring 9 in the pressure regulating valve 7 is too large, the fuel will flow back to the pressure regulating valve chamber 3.5 of the connecting block 3 from the first oil return port 13.1 and the second oil return port 13.2. The compressed air provided by the air pump 4 is mixed with the high pressure fuel in the gas nozzle 6, and the oil and gas mixture is sprayed out of the gas nozzle 6. As shown, Figure 4As shown, the oil and gas pressure are balanced to reduce the pressure stabilizing device in the oil passage, thereby achieving real-time adjustment of oil and gas pressure. At the same time, the air nozzle 6, pressure regulating valve 7 and connecting block 3 are integrated to greatly reduce the volume of the air-clamping injection device.

[0035] The air inlets refer to the first air inlet 10.1, the second air inlet 10.2, or the third air inlet 10.3, respectively.

[0036] The oil return ports refer to the first oil return port 13.1 and the second oil return port 13.2, which are three oil return ports.

[0037] like Figure 4 As shown, the oil-gas two-phase force balance requirement is: spring force F spring The reed's own weight G, and the force F exerted by the compressed gas on the reed. g1 and F g2 And their respective included angles α and β, the pressure F of the fuel on the reed. oil And the electromagnetic force F generated by the energized coil electric The resulting resultant forces are in equilibrium, where the spring force is mainly composed of the spring's own elastic force F0 and the elastic force generated by the pre-compression x.

[0038] F g1 cosα+F g2 cosβ±F spring -GF electric -F oil =0 (1)

[0039] F g1 sinα-F g2 sinβ=0 (2)

[0040] F spring -F0±kx=0 (3)

[0041] The working method of the air-jet injection device applied to a small heavy oil rotary engine disclosed in this embodiment is as follows:

[0042] Before the small heavy oil rotary engine operation, open the pressure relief port 3.7 at the connecting block 3, after the pressure in the air injection device returns to atmospheric pressure, close the pressure relief port 3.7. Start the rotary engine, use the air pump 4 to pressurize the air injection device, part of the compressed gas enters the pressure regulating valve chamber 3.5 of the connecting block 3, passes through the first air port 10.1, the second air port 10.2 and the third air port 10.3, opens the spring 11 and the reed 9 of the pressure regulating valve 7, and part of it directly fills the air nozzle chamber 3.2 of the connecting block 3. After the engine maintains a certain determined value according to the command, the ECU 3.11 changes the current in the electromagnetic coil 8 according to the oil supply demand of the engine, and then adjusts the electromagnetic force of the magnet reed 9, and the pressure difference between oil and gas is obtained through the pressure returned by the pressure sensor 15, so that the pressure in the chamber of the connecting block 3 tends to be stable. When the engine speed changes, the ECU 3.11 adjusts the current in the electromagnetic coil 8 through the feedback obtained by the pressure sensor, reduces the mechanism at both ends of the oil and gas road through the pressure feedback of the oil and gas road, and ensures the stable pressure difference of the gas road and the oil road through the adjusting action of the pressure regulating valve 7, realizes the precise fuel injection control, and realizes the matching of the oil supply characteristics of the fuel injection device and the speed characteristics of the engine. The fuel stored in the air nozzle chamber realizes the secondary breaking of droplets by the scouring disturbance of compressed gas, and then improves the atomization effect and improves the performance and working reliability of the heavy oil rotary engine.

[0043] The above specific description describes the purpose, technical scheme and beneficial effects of the application in detail. It should be understood that the above description is only a specific embodiment of the application, which is used to explain the application and does not limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. An air entraining device for a small heavy oil rotary engine characterised in that: It includes oil-gas separator, oil pump, pressure regulating valve, air nozzle, air pump, connecting block, oil pipe and oil tank; the connecting block is used for oil-gas transportation and maintaining constant pressure difference of oil-gas two phases, and is composed of oil inlet, oil return port, flow sensor, electromagnetic controller, pressure regulating valve, air inlet, pressure relief port and exhaust port; high-pressure fuel enters oil channel from oil inlet, and directly enters air nozzle from oil outlet; in order to ensure engine safety requirement, electromagnetic controller is used to control opening size of oil return port; when engine is in emergency stop operation, oil return port is opened to discharge fuel in connecting block; at the same time, flow sensor is installed at oil inlet, ECU is used to record oil channel flow, which is beneficial to realize matching of fuel injection device and engine power characteristics; oil channel has large cross-sectional area from top to bottom, and then small cross-sectional area, pressure loss is generated at cross-sectional area, fuel kinetic energy is increased, and fuel atomization quality is improved; compressed gas enters air nozzle through exhaust port after passing through air inlet; The pressure relief port is used to ensure that high-pressure air not discharged in time after use does not damage the strength of the connecting block cavity; the pressure regulating valve chamber is used as a connecting medium of the oil-gas channel, and is used to realize mutual propagation of oil-gas channel pressure; the pressure regulating valve comprises an electromagnetic coil, a magnetic block spring piece, an air port, a spring, an oil inlet and an oil return port; the air port is used to provide an inlet for compressed gas in the pressure regulating valve chamber; in order to ensure sufficient flow into the air port, three air ports are opened, the flow area of compressed gas is increased, the oil-gas regulation becomes more sensitive, and the time required for pressure wave transmission is reduced; the strength of the current of the electromagnetic coil is controlled by the electronic control unit ECU, which causes different electromagnetic forces of the magnetic block, causes the spring piece to be offset, different spring piece positions affect the volume of the oil-gas chamber in the pressure regulating valve, affect the pressure difference of oil-gas two phases, the spring piece position is recorded in the ECU through the pressure sensor, thereby flexibly adjusting the electromagnetic force according to the oil-gas two-phase force balance requirement, meeting the adaptation requirement of the engine and the fuel injection system; when the liquid pressure at the lower end of the spring piece in the pressure regulating valve is too large, the fuel will flow back to the pressure regulating valve chamber of the connecting block; compressed air provided by the air pump is mixed with high-pressure fuel in the air nozzle, and the oil-gas mixture is sprayed from the air nozzle; the oil and gas pressure balance mode is used to reduce the pressure stabilizing device of the oil channel, realize instant adjustment of oil-gas pressure, integrate the air nozzle, pressure regulating valve and connecting block, and greatly reduce the size of the air injection device.

2. An air entraining device for a small heavy oil rotary engine as defined in claim 1, wherein: Before the small heavy oil rotor engine runs, open the pressure relief port at the connecting block, after the pressure in the air injection device recovers to atmospheric pressure, close the pressure relief port; start the rotor engine, pressurize the air injection device with the air pump, part of the compressed gas enters the pressure regulating valve chamber of the connecting block, passes through the first air port, the second air port and the third air port, pushes open the spring and the reed of the pressure regulating valve, and part of the compressed gas directly fills the air nozzle chamber of the connecting block; after the engine maintains a certain determined value according to the instruction, the ECU changes the current in the electromagnetic coil according to the oil supply demand of the engine, and then adjusts the electromagnetic force of the magnet reed, obtains the pressure difference between oil and gas through the pressure returned by the pressure sensor, and makes the pressure in the connecting block chamber tend to be stable; when the engine speed changes, the ECU adjusts the current in the electromagnetic coil through the feedback obtained by the pressure sensor, reduces the mechanism at both ends of the oil and gas road through the pressure feedback of the oil and gas road, ensures the stable pressure difference of the gas road and the oil road through the adjusting effect of the pressure regulating valve respectively, realizes the accurate injection quantity control, realizes the matching of the oil supply characteristics of the injection device and the speed characteristics of the engine; the fuel stored in the air nozzle chamber realizes the secondary breaking of the liquid droplets by the scouring disturbance effect of the compressed gas, and then improves the atomization effect and improves the performance and working reliability of the heavy oil rotor engine.

3. An air entraining device for a small heavy oil rotary engine as defined in claim 2 wherein: The position where the oil passage becomes smaller is an oil passage sudden contraction section, and the oil passage sudden contraction section adopts an included angle of 60°.

4. An air entraining device for a small heavy oil rotary engine as defined in claim 2 wherein: The ECU is directly arranged inside the connecting block chamber.

5. An air entraining device for a small heavy oil rotary engine as defined in claim 2 wherein: The pressure regulating valve spring material is selected to be chromium alloy steel.

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