Centrifugal ventilator structure with high separation efficiency and low flow resistance loss

Abstract

The invention relates to the technical field of gas-liquid separation, and discloses a high-separation-efficiency low-resistance-loss long-life centrifugal ventilator device which comprises a rotor, a shell and an end cover, the rotor is arranged in the shell through a front bearing and a rear bearing, an air inlet is formed in the front section of the shell, an air outlet is formed in the rear section of the shell, and an oil outlet is formed in the side face of the middle section of the shell. The rotor is a two-stage rotor, a first-stage impeller of the rotor is a centrifugal impeller, a second-stage impeller of the rotor is a radial plate type impeller, the center of the second-stage impeller of the rotor is hollowed out, the hollowed-out position is communicated with an exhaust port of the shell through a through hole formed in a rear cover plate of the second-stage impeller, the end cover is arranged at the rear end of the rotor, and an exhaust hole is formed in the end cover. On one hand, oil-gas two-stage separation is achieved through the single-shaft double-rotor structure, meanwhile, the axial gaps between the rotors and the end covers are reduced, it is guaranteed that oil gas leaked through the axial gaps is as little as possible, and therefore the separation efficiency of the centrifugal ventilator is improved; on the other hand, the rotor structure is optimized, and oil gas is pressurized by adopting a pressurizing blade mode, so that part of flow resistance loss is counteracted; and finally, the shell structure is optimized, and the bearings are lubricated through separated and collected oil, so that the service life of the centrifugal ventilator is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid separation, and in particular to a gas-liquid separation device, and in particular to a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life. Background Art

[0002] Centrifugal ventilators are important components of the lubrication and ventilation subsystem of aircraft engines. Their separation efficiency and resistance characteristics directly determine the lubricating oil chamber pressure and system ventilation flow, affecting the endurance of aircraft engines. In addition, long-life design is also a current trend in the research of aircraft engine accessories. Under the condition of a certain ventilation volume, the higher the separation efficiency of the centrifugal ventilator, the greater its flow resistance. Therefore, a centrifugal ventilator device with both high separation efficiency and low resistance is of great significance to the lubrication and ventilation subsystem of aircraft engines. In the current public scheme, these two are still conflicting. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a centrifugal ventilator device with high separation efficiency, low resistance loss and long life. The two-stage separation of oil and gas is achieved by adopting a single-axis dual-rotor structure, while reducing the axial gap between the rotor and the end cover to ensure that the oil and gas leaking through the axial gap is as little as possible, thereby improving the separation efficiency of the centrifugal ventilator; on the other hand, the rotor structure is optimized and booster blades are used to pressurize the oil and gas, thereby offsetting part of the flow resistance loss.

[0004] The technical solution of the present invention is as follows:

[0005] A centrifugal ventilator device with high separation efficiency, low resistance loss and long life comprises a rotor, a shell and an end cover. The rotor is arranged in the shell through a front bearing and a rear bearing. An air inlet is arranged in the front section of the shell, an air outlet is arranged in the rear section of the shell, and an oil drain port is arranged on the side of the middle section of the shell. The rotor is a two-stage rotor. The first-stage impeller of the rotor is a centrifugal impeller, and the second-stage impeller of the rotor is a spoke plate impeller. The center of the second-stage impeller of the rotor is hollowed out, and the hollowed-out part is connected to the exhaust port of the shell through a through hole arranged on the rear cover plate of the second-stage impeller. The end cover is arranged at the rear end of the rotor, and the end cover is provided with an exhaust hole.

[0006] Furthermore, a V-shaped groove is provided on the edge of the first-stage impeller of the rotor to guide the gas after the primary separation to the second-stage impeller.

[0007] Furthermore, the spoke-plate impeller is a forward-curved structure.

[0008] Furthermore, the diameter of the first-stage impeller of the rotor is greater than the diameter of the second-stage impeller.

[0009] Furthermore, the outer annular surface of the rear cover plate of the second-stage impeller is provided with a labyrinth-type radial sealing structure, and the front annular surface of the end cover is also provided with a corresponding labyrinth-type radial sealing structure.

[0010] Furthermore, a volute cavity is arranged on the inner wall of the casing corresponding to the position of the first-stage impeller of the rotor, and the oil discharge port is arranged at the volute cavity.

[0011] Furthermore, a double-lead guide groove is provided on the inner wall of the housing corresponding to the position of the second-stage impeller of the rotor. The double-lead guide groove is specifically a double-helical groove body, which guides the oil separated by the second-stage impeller to the oil discharge port.

[0012] Furthermore, a small hole is provided between the oil discharge port and the front bearing to form a flow channel.

[0013] Technical effects of the present invention:

[0014] A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life is provided, which comprises a rotor, an end cover and a shell. On the one hand, a two-stage separation of oil and gas is achieved by adopting a single-shaft double-rotor structure, while reducing the axial gap between the rotor and the end cover to ensure that the oil and gas leaking through the axial gap is as small as possible, thereby improving the separation efficiency of the centrifugal ventilator; on the other hand, the rotor structure is optimized, and the oil and gas are pressurized by means of booster blades, thereby offsetting part of the flow resistance loss; finally, by optimizing the shell structure, the separated and collected oil is used to lubricate the bearings, thereby improving the service life of the centrifugal ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to the present invention;

[0017] Figure 2 It is a schematic diagram of the rotor structure of a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to the present invention;

[0018] Figure 3 is a schematic diagram of a first-stage rotor blade of the present invention;

[0019] Figure 4 It is a schematic diagram of the shell structure of a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to the present invention;

[0020] Figure 5 This is a schematic diagram of the end cover structure of a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to the present invention;

[0021] Among them, 100 is a rotor, 200 is a housing, 300 is an end cover 300; 101 is a primary separation blade, 102 is a secondary separation blade, 103 is a first sealing structure; 201 is an oil discharge port, 202 is a double-lead guide groove, 203 is a volute; 301 is a second sealing structure. DETAILED DESCRIPTION

[0022] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships 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 device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] Embodiment 1:

[0026] A centrifugal ventilator device with high separation efficiency, low resistance loss and long life includes a rotor 100, a shell 200 and an end cover 300. The rotor 100 is arranged in the shell 200 through a front bearing and a rear bearing. The front section of the shell 200 is provided with an air inlet, the rear section of the shell 200 is provided with an air outlet, and the side of the middle section of the shell 200 is provided with an oil drain port 201. The rotor 100 is a two-stage rotor. The first-stage impeller of the rotor 100 is a centrifugal impeller, and the second-stage impeller of the rotor 100 is a spoke plate impeller. The center of the second-stage impeller of the rotor 100 is hollowed out, and the hollowed-out part is connected to the exhaust port of the shell 200 through a through hole arranged on the rear cover plate of the second-stage impeller. The end cover 300 is arranged at the rear end of the rotor 100, and the end cover 300 is provided with an exhaust hole.

[0027] The edge of the first-stage impeller of the rotor 100 is provided with a V-shaped groove to guide the gas after the primary separation to the second-stage impeller.

[0028] The spoke-plate impeller is a forward-curved structure.

[0029] The diameter of the first-stage impeller of the rotor 100 is greater than the diameter of the second-stage impeller.

[0030] The outer annular surface of the rear cover plate of the second-stage impeller is provided with a labyrinth-type radial sealing structure, and the front annular surface of the end cover 300 is also provided with a corresponding labyrinth-type radial sealing structure.

[0031] A volute cavity 203 is provided on the inner wall of the housing 200 corresponding to the position of the first-stage impeller of the rotor 100 , and the oil discharge port 201 is provided at the volute cavity 203 .

[0032] A double-lead guide groove 202 is provided on the inner wall of the housing 200 corresponding to the position of the second-stage impeller of the rotor 100. The double-lead guide groove 202 is specifically a double-helical groove body, which guides the oil separated by the second-stage impeller to the oil discharge port 201.

[0033] A small hole is provided between the oil discharge port 201 and the front bearing to form a flow channel.

[0034] Embodiment 2:

[0035] The present invention provides a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life, comprising a rotor, an end cover and a shell. On the one hand, a two-stage separation of oil and gas is achieved by adopting a single-shaft double-rotor structure, while reducing the axial gap between the rotor and the end cover to ensure that the oil and gas leaking through the axial gap is as small as possible, thereby improving the separation efficiency of the centrifugal ventilator; on the other hand, the rotor structure is optimized, and the oil and gas are pressurized by using a booster blade to offset part of the flow resistance loss; finally, by optimizing the shell structure, the separated and collected oil is used to lubricate the bearing to improve the service life of the centrifugal ventilator.

[0036] A high separation efficiency centrifugal ventilator structure comprises a rotor 100, a shell 200 and an end cover 300.

[0037] In a possible embodiment, the rotor 100 is provided with a primary separation blade 101 at one end close to the inlet side, the rotor 100 is provided with a secondary separation blade 102 at one end close to the outlet side, and three sealing structures 103 are provided on the back of the secondary separation blade 102 .

[0038] In a possible embodiment, a volute cavity 203 is provided at the first stage inside the shell 200, an oil discharge port 201 is provided at the first stage inside the shell 200, a volute cavity 203 is provided at the first stage inside the shell 200, and a double-lead guide groove 202 is provided at the second stage inside the shell 200.

[0039] In a possible embodiment, a sealing structure 301 matching with 103 is provided on the outer end surface of the end cover 300 .

[0040] The present invention provides a centrifugal ventilator device with high separation efficiency, low resistance loss and long service life, comprising a rotor, an end cover and a shell. On the one hand, a two-stage separation of oil and gas is achieved by adopting a single-axis double-rotor structure, while reducing the axial gap between the rotor and the end cover to ensure that the oil and gas leaking through the axial gap is as small as possible, thereby improving the separation efficiency of the centrifugal ventilator; on the other hand, the rotor structure is optimized, and the oil and gas are pressurized by means of booster blades, thereby offsetting part of the flow resistance loss; finally, by optimizing the shell structure, the separated and collected oil is used to lubricate the bearings to improve the service life of the centrifugal ventilator.

[0041] Embodiment 3:

[0042] The centrifugal ventilator adopts a double-rotor structure design, which increases the oil droplet particle size collection range and thus improves the oil-gas separation efficiency.

[0043] Based on the double rotor structure of the centrifugal ventilator, the first stage separation impeller adopts a centrifugal impeller. The centrifugal impeller can not only perform preliminary separation of the oil mist, but also realize the oil mist pressure and speed increase, and aggregate the smaller lubricating oil particles in the oil mist after preliminary separation into larger particle oil droplets, which is convenient for the second stage oil collection.

[0044] Based on the double rotor structure of the centrifugal ventilator, a V-shaped groove is set on the edge of the first-stage separation centrifugal blade to facilitate the oil mist after the first separation to be led to the second-stage separation blade. After the oil mist after the first separation is discharged along the volute wall, the oil mist will enter the second-stage separation blade through the V-shaped groove due to the centrifugal force, reducing the backflow in the process, thereby further accelerating the oil mist.

[0045] Based on the single-shaft dual-rotor structure of the centrifugal ventilator, the second-stage separation impeller adopts a radial plate blade form to perform secondary separation and collection of oil mist. Since the radial plate blade is a forward curved structure, it can better collect oil droplets and also collect gas to the axis position, which has more advantages in gas collection and exhaust, further improving the separation efficiency.

[0046] Based on the dual-rotor structure of the centrifugal ventilator, the diameter of the first-stage separation impeller should be larger than the diameter of the second-stage separation impeller to increase the tangential speed of the droplets when they are thrown out of the impeller and improve the overall oil and gas separation efficiency.

[0047] Based on the dual-rotor structure of the centrifugal ventilator, the dual-rotor adopts a coaxial design, that is, an integrated two-stage impeller structure. This structure integrates two impellers of different forms, saving space and weight of the centrifugal ventilator.

[0048] Based on the single-shaft dual-rotor structure of the centrifugal ventilator, a labyrinth radial sealing structure is added on the back of the second-stage separation impeller to ensure that the amount of oil and gas passing through the radial gap between the rotor and the end cover is as small as possible, thereby improving the oil and gas separation efficiency.

[0049] Based on the centrifugal ventilator single-shaft dual-rotor structure, the centrifugal ventilator shell adopts a graded setting, with a volute and an oil discharge port set in the first stage, and a double-lead spiral groove (double spiral) set in the second stage. The double-lead spiral groove collects the oil separated in the second stage and guides it to the oil discharge port. At the same time, the unseparated oil and gas can settle in the double-lead spiral groove. (The first and second stages of the shell correspond to Figure 1 Which two paragraphs?

[0050] Based on the single-shaft dual-rotor structure of the centrifugal ventilator, small holes are set at the oil discharge port (high-pressure area) and the rotor front end bearing to form a flow channel. Part of the oil droplets after separation and collection flow from the small holes at the oil discharge port to the rotor front end bearing to lubricate the bearing.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A centrifugal ventilator device with high separation efficiency, low resistance loss and long life, characterized in that: The invention comprises a rotor (100), a housing (200) and an end cover (300). The rotor (100) is arranged in the housing (200) via a front bearing and a rear bearing. An air inlet is arranged at the front section of the housing (200), an air outlet is arranged at the rear section of the housing (200), an oil discharge port (201) is arranged at the side of the middle section of the housing (200), the rotor (100) is a two-stage rotor, the first-stage impeller of the rotor (100) is a centrifugal impeller, the second-stage impeller of the rotor (100) is a spoke plate impeller, the center of the second-stage impeller of the rotor (100) is hollowed out, and the hollowed-out part is connected to the exhaust port of the housing (200) through a through hole arranged on the rear cover plate of the second-stage impeller. The end cover (300) is arranged at the rear end of the rotor (100), and the end cover (300) is provided with an exhaust hole.

2. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 1, characterized in that: The edge of the first-stage impeller of the rotor (100) is provided with a V-shaped groove to guide the gas after the primary separation to the second-stage impeller.

3. A centrifugal ventilator device with high separation efficiency, low resistance loss and long life according to claim 1, characterized in that: The spoke plate impeller is a forward curved structure.

4. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 1, characterized in that: The diameter of the first-stage impeller of the rotor (100) is greater than the diameter of the second-stage impeller.

5. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 1, characterized in that: The outer annular surface of the rear cover plate of the second-stage impeller is provided with a labyrinth-type radial sealing structure, and the front annular surface of the end cover (300) is also provided with a corresponding labyrinth-type radial sealing structure.

6. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 1, characterized in that: A volute cavity (203) is arranged on the inner wall of the housing (200) corresponding to the position where the first-stage impeller of the rotor (100) is located, and the oil discharge port (201) is arranged at the volute cavity (203).

7. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 6, characterized in that: A double-lead guide groove (202) is provided on the inner wall of the housing (200) at the position where the second-stage impeller of the rotor (100) is located. The double-lead guide groove (202) is specifically a double-helical groove body, which guides the oil separated by the second-stage impeller to the oil discharge port (201).

8. A centrifugal ventilator device with high separation efficiency, low resistance loss and long service life according to claim 1, characterized in that: A small hole is provided between the oil discharge port (201) and the front bearing to form a flow channel.

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