A combined double pump

Abstract

The present invention relates to a combined double pump, which is partially immersed in an oil pan, and includes a pump body, an inner rotor of an oil pump, an outer rotor of an oil pump, a pump cover of an oil pump, a driving shaft, a vacuum pump rotor, a vacuum pump blade, and a vacuum pump cover; the pump body is provided with a vacuum pump chamber and an oil pump chamber, and is provided with an inlet and exhaust passage for connecting the vacuum pump chamber and an oil inlet and exhaust passage for connecting the oil pump chamber, the vacuum pump chamber is provided with a vacuum pump rotor and a plurality of vacuum pump blades, the oil pump chamber is provided with an inner rotor of an oil pump and an outer rotor of an oil pump, the driving shaft runs through the two pump chambers and is penetrated in the shaft holes of the vacuum pump rotor and the inner rotor of the oil pump; the pump body is provided with a lubricating oil passage connecting the oil pump chamber and the vacuum pump chamber, and the bottom surface and side wall of the vacuum pump chamber are provided with a gas distribution groove. The present invention has a compact structure, reduces the installation space, and reduces the power consumption of the engine.

Description

Technical Field

[0001] The invention relates to an engine lubrication system and a brake system, and in particular to a combined double pump integrating an engine oil pump and a vacuum pump. Background Art

[0002] In the prior art, vacuum pumps and oil pumps are generally used separately, which is equivalent to two different structures driven by their own related transmission mechanisms. This is not in line with the current design concept of maintenance and simplified structure, and increases the power consumption of the engine. The vacuum pump is usually driven by a cam. Due to the low speed of the cam drive, the required volume is large, the energy consumption is high, and the component mass is increased and the potential of the engine structure space is reduced. Combining the vacuum pump and the oil pump can reduce the volume of the vacuum pump, but the vacuum pump is driven by the crankshaft, the load it is subjected to is increased, the speed is faster, and higher requirements are placed on its load capacity. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a combined double pump integrating an oil pump and a vacuum pump, which has a compact structure, occupies little space, and conforms to the current design concept of maintenance and simplified structure.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a combined double pump, which is partially immersed in the oil pan, and the double pump includes a pump body, an oil pump inner rotor, an oil pump outer rotor, an oil pump cover, a driving shaft, a vacuum pump rotor, vacuum pump blades, and a vacuum pump cover; the pump body is provided with a vacuum pump chamber and an oil pump chamber, and is provided with an inlet and exhaust passage for connecting the vacuum pump chamber and an oil inlet and exhaust passage for connecting the oil pump chamber, the vacuum pump chamber is equipped with a vacuum pump rotor and a plurality of vacuum pump blades, and the oil pump chamber is equipped with an oil pump inner rotor and an oil pump outer rotor; the driving shaft runs through the two The pump chamber is arranged in the axial holes of the vacuum pump rotor and the inner rotor of the oil pump; one side of the circumference of the vacuum pump rotor is in contact with the side wall of the vacuum pump chamber, and the pump body is provided with a lubricating oil path connecting the oil pump chamber and the vacuum pump chamber. The lubricating oil entering the vacuum pump chamber is thrown onto the side wall of the vacuum pump chamber under the action of centrifugal force, so as to fill the gap between the vacuum pump blades and the side wall of the vacuum pump chamber; the vacuum pump blades, the vacuum pump rotor and the side wall of the vacuum pump chamber form an air intake chamber, a working chamber and an exhaust chamber, the bottom surface and the side wall of the vacuum pump chamber are provided with air distribution grooves, and the joint surface of the vacuum pump cover is also provided with air distribution grooves.

[0005] In the above technical scheme, since the vacuum pump and the oil pump are coaxially driven, the vacuum pump directly draws oil from the oil pump for lubrication, which reduces the design of the vacuum pump lubrication pipeline, simplifies the processing of parts, and has a small pressure difference fluctuation, reducing the influence of pressure fluctuation on the vacuum pump's exhaust performance; the oil directly enters the vacuum pump chamber from the oil pump chamber of the pump body through the lubricating oil circuit, and the oil lubricates the friction surfaces of the vacuum pump rotor and the vacuum pump blades under the action of centrifugal force, and squeezes the vacuum pump blades to make them in close contact with the side walls of the vacuum pump chamber, filling the gap in the chamber, preventing the high and low pressure areas in the chamber from blowing gas to each other, and ensuring the good sealing of the vacuum pump chamber; then an air distribution groove is arranged in the vacuum pump chamber, which can increase the suction volume, avoid oil and air trapping, discharge high-pressure oil and gas, and meet the strength requirements.

[0006] In one embodiment, an air inlet distribution groove covering the air inlet and an exhaust distribution groove covering the exhaust port are provided on the side wall of the vacuum pump chamber, and an arc-shaped bottom air distribution groove is provided on the bottom surface of the vacuum pump chamber below the exhaust distribution groove, close to the side wall.

[0007] In one embodiment, a pump cover air distribution groove is respectively provided on the joint surface of the vacuum pump cover at positions corresponding to the air inlet air distribution groove and the exhaust air distribution groove.

[0008] In one embodiment, the inlet end of the lubricating oil circuit is connected to the low-pressure area of ​​the oil pump chamber, and the outlet end of the lubricating oil circuit is opened in the high-pressure area of ​​the vacuum pump chamber. Since the double pump is immersed in the oil pan, the optimal amount of oil in the vacuum pump is of great significance to improving the use efficiency and service life of the vacuum pump. When ensuring that the vacuum pump is fully lubricated, the less the amount of oil stored in the vacuum pump, the more beneficial it is to reduce the power consumption of the engine; the advantages of setting the inlet end of the lubricating oil circuit in the low-pressure area of ​​the oil pump chamber: ① During operation, the excess oil in the vacuum pump chamber can be sucked away by the oil pump; ② Under cold start, the vacuum pump chamber has less oil, the oil pump sucks at low pressure, and the vacuum pump discharges at high pressure, which is also beneficial for cold start; the advantages of setting the outlet end of the lubricating oil circuit in the high-pressure area of ​​the vacuum pump chamber: it can reduce the pressure oil back into the vacuum pump when the vacuum pump is shut down, thereby reducing the amount of oil stored in the vacuum pump chamber, improving the use efficiency and service life of the vacuum pump, and reducing the energy consumption of the engine.

[0009] In one embodiment, the starting point of the exhaust gas distribution groove is 0°-4° away from the seal between the vacuum pump rotor and the side wall of the vacuum pump chamber, and the end point of the exhaust gas distribution groove extends to the exhaust chamber of the vacuum pump chamber. A small space between the exhaust port and the seal between the vacuum pump rotor and the side wall of the vacuum pump chamber is a dangerous space, because the space here is closed and high-pressure oil and gas cannot be discharged. With the help of the exhaust gas distribution groove, the dangerous space can be connected with the exhaust port, so that the high-pressure oil and gas in the dangerous space can be discharged from the exhaust port.

[0010] In one embodiment, the end point of the exhaust gas distribution groove is 8°-15° away from the seal between the vacuum pump rotor and the side wall of the vacuum pump chamber, the groove width of the exhaust gas distribution groove is 0.3-0.5mm greater than the upper and lower edges of the exhaust port, and the groove depth is 2.0-2.5mm.

[0011] In one embodiment, the end surface of the inner rotor of the oil pump close to the pump body is provided with an annular oil storage groove. The inner rotor has an oil storage groove, which reduces the weight on the one hand, and the oil in the oil storage groove can directly lubricate the driving shaft on the other hand.

[0012] In one embodiment, one-way valves are installed in the vacuum pump inlet and exhaust channels on the pump body, and the openings of the inlet and exhaust channels on the outside of the pump body are higher than the pressure oil in the oil pan. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the combined double pump in an embodiment of the present invention;

[0014] Figure 2 Schematic diagram of the internal structure of a vacuum pump in an embodiment of the present invention;

[0015] Figure 3 Schematic diagram of the internal structure of the oil pump in an embodiment of the present invention;

[0016] Figure 4 Schematic diagram of the pump chamber structure of the oil pump in an embodiment of the present invention;

[0017] Figure 5 Schematic diagram of the structure of the vacuum pump chamber in an embodiment of the present invention;

[0018] Figure 6 Schematic diagram of the dangerous space structure of the vacuum pump chamber in an embodiment of the present invention;

[0019] Figure 7 A schematic diagram of the gas distribution groove of the vacuum pump cover in an embodiment of the present invention;

[0020] Figure 8 is a schematic diagram of an inner rotor of an oil pump in an embodiment of the present invention;

[0021] The accompanying drawings are marked as follows:

[0022] 1——Pump body 2——Drive shaft 3——Inlet end

[0023] 4——Vacuum pump rotor 5——Vacuum pump blade 6——Outlet end

[0024] 7——Inner rotor of oil pump 8——Outer rotor of oil pump 9——Intake air distribution groove

[0025] 10——Exhaust air distribution groove 11——Bottom air distribution groove 12——Pump cover air distribution groove

[0026] 7a——Oil storage tank. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and are not limited to the invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] like Figures 1 to 8As shown, a combined double pump, which is partially immersed in the oil pan, includes a pump body 1, an oil pump inner rotor 7, an oil pump outer rotor 8, an oil pump cover, a driving shaft 2, a vacuum pump rotor 4, a vacuum pump blade 5, and a vacuum pump cover; the pump body 1 is provided with a vacuum pump chamber and an oil pump chamber, and is provided with an inlet and exhaust passage for connecting the vacuum pump chamber and an oil inlet and exhaust passage for connecting the oil pump chamber, and a one-way valve is installed in the inlet and exhaust passages, and the openings of the inlet and exhaust passages on the outside of the pump body 1 are higher than the oil pressure in the oil pan; the vacuum pump chamber is provided with a vacuum pump rotor 4 and a plurality of vacuum pump blades 5, the oil pump chamber is provided with an oil pump inner rotor 7 and an oil pump outer rotor 8, and the end face of the oil pump inner rotor 7 close to the pump body 1 is provided with an annular oil storage groove 7a; the driving shaft 2 passes through the two pump chambers and is penetrated in the axial holes of the vacuum pump rotor 4 and the oil pump inner rotor 7; one side of the circumference of the vacuum pump rotor 4 is close to the vacuum pump chamber, and the vacuum pump inner rotor 7 is provided with a ring-shaped ... On the side wall of the vacuum pump chamber, a lubricating oil circuit connecting the oil pump chamber and the vacuum pump chamber is provided on the pump body 1, the inlet end 3 of the lubricating oil circuit is communicated with the low-pressure area of ​​the oil pump chamber, and the outlet end 6 of the lubricating oil circuit is opened in the high-pressure area of ​​the vacuum pump chamber. The lubricating oil entering the vacuum pump chamber is thrown onto the side wall of the vacuum pump chamber under the action of centrifugal force, and is used to fill the gap between the vacuum pump blades 5 and the side wall of the vacuum pump chamber; the vacuum pump blades 5, the vacuum pump rotor 4 and the side wall of the vacuum pump chamber form an intake chamber, a working chamber and an exhaust chamber, an intake air distribution groove 9 covering the air inlet and an exhaust air distribution groove 10 covering the exhaust port are provided on the side wall of the vacuum pump chamber, an arc-shaped bottom air distribution groove 11 is provided on the bottom surface of the vacuum pump chamber below the exhaust air distribution groove 10, and a pump cover air distribution groove 12 is provided on the joint surface of the vacuum pump cover at the positions corresponding to the intake air distribution groove 9 and the exhaust air distribution groove 10.

[0030] In this embodiment, since the vacuum pump and the oil pump are coaxially driven, the vacuum pump directly draws oil from the oil pump for lubrication, which reduces the design of the vacuum pump lubrication pipeline, simplifies the processing of parts, and has a small pressure difference fluctuation, reducing the influence of pressure fluctuation on the vacuum pump's exhaust performance; the oil directly enters the vacuum pump chamber from the pump body oil pump chamber through the lubricating oil path, and the oil lubricates the friction surfaces of the vacuum pump rotor 4 and the vacuum pump blades 5 under the action of centrifugal force, and squeezes the vacuum pump blades 5 to make them in close contact with the side walls of the vacuum pump chamber, filling the gap in the chamber, preventing the high and low pressure areas in the chamber from blowing gas into each other, and ensuring the good sealing of the vacuum pump chamber; then an air intake gas distribution groove 9 is arranged in the vacuum pump chamber to increase the suction volume.

[0031] Since the duplex pump is immersed in the oil pan, the optimal amount of oil in the vacuum pump is of great significance for improving the efficiency and service life of the vacuum pump. The less oil stored in the vacuum pump while ensuring sufficient lubrication of the vacuum pump, the more beneficial it is to reduce the power consumption of the engine; the advantages of setting the inlet end 3 of the lubricating oil circuit in the low-pressure area of ​​the oil pump chamber: ① During operation, excess oil in the vacuum pump chamber can be sucked away by the oil pump; ② Under cold start, the vacuum pump chamber has less oil stored, the oil pump sucks at low pressure and the vacuum pump discharges at high pressure, which is also beneficial for cold start; the advantages of setting the outlet end 6 of the lubricating oil circuit in the high-pressure area of ​​the vacuum pump chamber: it can reduce the back suction of pressure oil into the vacuum pump when the vacuum pump is shut down, thereby reducing the amount of oil stored in the vacuum pump chamber, improving the efficiency and service life of the vacuum pump, and reducing the energy consumption of the engine.

[0032] like Figure 5 , 6 As shown, the slotting start point of the exhaust gas distribution groove 10 is 0°-4° away from the seal between the vacuum pump rotor 4 and the side wall of the vacuum pump chamber, the slotting end point of the exhaust gas distribution groove 10 extends to the exhaust chamber of the vacuum pump chamber, the slotting end point of the exhaust gas distribution groove 10 is 8°-15° away from the seal between the vacuum pump rotor 4 and the side wall of the vacuum pump chamber, the slotting width of the exhaust gas distribution groove 10 is 0.3-0.5mm more than the upper and lower edges of the exhaust port, and the slotting depth is 2.0-2.5mm. The small space between the exhaust port and the seal between the vacuum pump rotor 4 and the side wall of the vacuum pump chamber is a dangerous space, because the space here is closed, and high-pressure oil and gas cannot be discharged. With the help of the exhaust gas distribution groove 9, the dangerous space can be connected with the exhaust port, so that the high-pressure oil and gas in the dangerous space can be discharged from the exhaust port.

[0033] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

[0034] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A combined double pump, characterized in that: The combined double pump is partially immersed in an oil pan, and comprises a pump body (1), an oil pump inner rotor (7), an oil pump outer rotor (8), an oil pump cover, a driving shaft (2), a vacuum pump rotor (4), vacuum pump blades (5), and a vacuum pump cover; the pump body (1) is provided with a vacuum pump chamber and an oil pump chamber, and is provided with an inlet and exhaust passage for connecting the vacuum pump chamber and an oil inlet and exhaust passage for connecting the oil pump chamber; the vacuum pump chamber is provided with a vacuum pump rotor (4) and a plurality of vacuum pump blades (5); the oil pump chamber is provided with an oil pump inner rotor (7) and an oil pump outer rotor (8); the driving shaft (2) passes through the two pump chambers and is penetrated in the shaft holes of the vacuum pump rotor (4) and the oil pump inner rotor (7); the vacuum pump One side of the circumference of the rotor (4) is in contact with the side wall of the vacuum pump chamber. The pump body (1) is provided with a lubricating oil passage connecting the oil pump chamber and the vacuum pump chamber. The lubricating oil entering the vacuum pump chamber is thrown onto the side wall of the vacuum pump chamber under the action of centrifugal force to fill the gap between the vacuum pump blades (5) and the side wall of the vacuum pump chamber. An air intake chamber, a working chamber and an exhaust chamber are formed between the vacuum pump blades (5), the vacuum pump rotor (4) and the side wall of the vacuum pump chamber. An air distribution groove is provided on the bottom surface and the side wall of the vacuum pump chamber. An air distribution groove is also provided on the joint surface of the vacuum pump cover. The inlet end (3) of the lubricating oil passage is in communication with the low-pressure area of ​​the oil pump chamber. The outlet end (6) of the lubricating oil passage is opened in the high-pressure area of ​​the vacuum pump chamber.

2. The combined double pump according to claim 1, characterized in that: An air inlet distribution groove (9) covering the air inlet and an exhaust distribution groove (10) covering the exhaust port are provided on the side wall of the vacuum pump chamber, and an arc-shaped bottom air distribution groove (11) is provided on the bottom surface of the vacuum pump chamber below the exhaust distribution groove (10) near the side wall.

3. The combined double pump according to claim 1 or 2, characterized in that: A pump cover air distribution groove (12) is provided at a position corresponding to the air inlet air distribution groove (9) and the air exhaust air distribution groove (10) on the joint surface of the vacuum pump cover.

4. The combined double pump according to claim 2, characterized in that: The slotting start point of the exhaust gas distribution groove (10) is 0°-4° away from the sealing position between the vacuum pump rotor (4) and the side wall of the vacuum pump chamber, and the slotting end point of the exhaust gas distribution groove (10) extends to the exhaust cavity of the vacuum pump chamber.

5. The combined double pump according to claim 4, characterized in that: The slotting end point of the exhaust gas distribution groove (10) is 8°-15° away from the sealing position between the vacuum pump rotor (4) and the side wall of the vacuum pump chamber, the slotting width of the exhaust gas distribution groove (10) is 0.3-0.5mm greater than the upper and lower edges of the exhaust port, and the slotting depth is 2.0-2.5mm.

6. The combined double pump according to claim 1 or 2, characterized in that: An annular oil storage groove (7a) is provided on the end surface of the inner rotor (7) of the oil pump close to the pump body.

7. The combined double pump according to claim 1 or 2, characterized in that: One-way valves are installed in the vacuum pump inlet and exhaust channels on the pump body, and the openings of the inlet and exhaust channels on the outside of the pump body are higher than the pressure oil in the oil pan.

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