CN111140506A

CN111140506A - High-reliability sealing structure for supercharger

Info

Publication number: CN111140506A
Application number: CN202010100895.1A
Authority: CN
Inventors: 王飞飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-19
Filing date: 2020-02-19
Publication date: 2020-05-12

Abstract

The invention discloses a high-reliability sealing structure for a supercharger, which comprises a gear cavity and a rotor cavity, wherein the gear cavity is arranged on a cavity and used for mounting a gear transmission assembly, the rotor cavity is used for mounting a rotor, a gear is mounted in the gear cavity and filled with a certain amount of lubricating oil, and when a mechanical supercharger works, the gear cavity is closed; a rotor is arranged in the rotor cavity, and the rotor cavity is communicated with the outside atmosphere through an air inlet; the gear and the rotor are arranged on the same rotating shaft, and a double-row ball bearing and at least two oil seals are arranged between the gear and the rotor; a certain gap is reserved between the adjacent oil seals, the rotating shaft and the cavity form an oil collecting cavity in an enclosing mode, the oil collecting cavity is communicated with an oil storage tank through an oil drainage hole, and the oil storage tank is communicated with the outside atmosphere. This is equivalent to a negative pressure space arranged between the gear cavity and the rotor cavity, and the lubricating oil leaked to the rotor cavity flows to the oil collecting cavity by utilizing the negative pressure effect and then flows back to the oil storage tank by utilizing the gravity effect.

Description

High-reliability sealing structure for supercharger

Technical Field

The invention relates to the technical field of supercharger equipment, in particular to a high-reliability sealing structure for a supercharger. The mechanical supercharger can be called as an air compressor or a pump head or a blower or a roots supercharger and the like in different application fields.

Background

In supercharger applications, power is transmitted through a pair of meshing gears to a pair of meshing rotors via a rotating shaft. The cavity where the gear is located is called a gear cavity and is filled with a certain amount of lubricating oil, and the cavity where the rotor is located is called a rotor cavity. When the mechanical supercharger works, the gear cavity is closed and has high temperature; a rotor is arranged in the rotor cavity, and the rotor cavity is communicated with the outside atmosphere through an air inlet; when the supercharger works, the average air pressure in the gear cavity and the rotor cavity is higher than the external atmospheric pressure, the pressure in the gear cavity is higher than the rotor cavity under some working conditions, and the pressure difference provides power for the lubricating oil to leak from the gear cavity to the rotor cavity. A sealing structure is arranged between the gear cavity and the rotor cavity and used for preventing lubricating oil from leaking to the rotor cavity, and the sealing structure is particularly applied to the field of fuel cells. At present, only one oil seal is arranged between a gear cavity and a rotor cavity of the known supercharger, the sealing structure only prolongs the leakage time, the sealing reliability is insufficient, the sealing failure is caused, and the whole supercharger is in failure.

Meanwhile, a hydrogen circulating pump in a hydrogen supply system of the hydrogen fuel cell is of a similar structure, and the problem of insufficient sealing reliability also exists.

An improved sealing structure is now provided to address the above-mentioned problems.

Disclosure of Invention

An object of the present invention is to provide a highly reliable seal structure for a supercharger to solve the problems set forth in the above-described background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-reliability sealing structure for a supercharger comprises a connecting channel which is arranged between a gear cavity (6) and a rotor cavity (5) in a penetrating way, and a transmission shaft (7) which is arranged in the connecting channel in a penetrating way; one side of the transmission shaft (7) close to the gear cavity (6) is fixedly connected with the inner wall of the connecting channel through at least one double-row ball bearing (8); be close to be equipped with the oil blanket subassembly on transmission shaft (7) of rotor chamber (5) one side, the oil blanket subassembly includes that at least two are the oil blanket that the determining deviation set up, adjacent two the oil blanket has constructed oil collecting chamber (9) that are used for the buffer memory to pass the fluid of oil blanket with interface channel's inner wall, set up intercommunication oil collecting chamber (9) and outside draining hole (4) on interface channel's the lateral wall.

Preferably, the groove surface of the oil seal faces the gear cavity (6).

Preferably, the oil drain hole (4) is connected with an oil storage tank, a filter screen for filtering oil is arranged in the oil storage tank, an oil outlet pipe of the oil storage tank is connected with an oil return pump, and a liquid discharge end of the oil return pump is connected with an oil inlet of the gear cavity (6).

Preferably, the filter screen is conical.

Preferably, a flowmeter for detecting the flow of liquid and gas is arranged at the oil drainage hole (4), and the flowmeter is electrically connected with the input end of the alarm.

Preferably, the caliber of the inner end part of the oil drainage hole (4) is larger than that of the outer end part.

Compared with the prior art, the invention has the beneficial effects that: the invention is designed aiming at the defects of the prior device, at least two oil seals are arranged, an oil collecting cavity for caching oil passing through the oil seals is constructed by the adjacent oil seals and the inner wall of the connecting channel, and the oil collecting cavity is communicated with an oil storage tank through an oil drainage hole and finally communicated with the outside. This is equivalent to set up a negative pressure space between gear chamber and rotor chamber, utilizes the negative pressure effect to make the lubricating oil that leaks out through first oil blanket can not continue to leak to the rotor chamber through the second oil blanket, but the seepage is to the oil collecting chamber, reuse gravity effect backward flow to the oil storage tank. In order to facilitate timely discharge of oil in the oil collecting cavity, the oil passing through the oil seal can be cached in the oil collecting cavity, redundant oil can be discharged through the oil drainage hole, a worker can judge whether lubricating oil needs to be filled through the oil quantity discharged from the oil drainage hole, and the practicability is high.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: the oil seal structure comprises a first oil seal 1, a second oil seal 2, a cavity 3, an oil drainage hole 4, a rotor cavity 5, a gear cavity 6, a transmission shaft 7, a double-row ball bearing 8 and an oil collection cavity 9.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1, in an embodiment of the present invention, a high-reliability sealing structure for a supercharger includes a gear chamber 6 and a rotor chamber 5 provided in a corresponding chamber 3, and a transmission shaft 7 capable of rotating the gear and the rotor synchronously.

One end of the transmission shaft 7 is connected with the gear assembly, and the other end of the transmission shaft is connected with the rotor, so that the gear can synchronously run on the rotor, and power transmission is realized.

At least one double-row ball bearing 8 is installed on one side, close to the gear cavity 6, of the transmission shaft 7, and the friction coefficient in the movement process is reduced due to the arrangement of the double-row ball bearing 8, and the rotation precision is guaranteed.

And an oil seal assembly is arranged on the transmission shaft 7 close to one side of the rotor 5, and is used for isolating a channel between the gear 6 and the rotor cavity 5 and buffering the passing part of oil liquid.

Above-mentioned oil blanket subassembly includes that at least two are the oil blanket of a determining deviation setting, and adjacent oil blanket and connector channel inner wall have constructed the oil collecting cavity 9 that is used for the buffer memory to pass oil blanket fluid, for the ease of in time discharging the fluid in the oil collecting cavity 9, the draining hole 4 with oil collecting cavity 9 intercommunication is seted up on 3 surfaces of cavity. The oil seal may include a first oil seal 1 and a second oil seal 2.

This kind of oil blanket subassembly is conservative oil blanket design, through be equipped with oil collecting cavity 9 between two adjacent oil blanket, and the fluid that passes first oil blanket like this can cache in oil collecting cavity 9 department, because gravity action fluid can discharge through draining hole 4, in addition this kind of oil blanket mode also can prevent the high-pressure gas in the rotor chamber to get into the gear chamber, because the high-pressure gas who passes the oil blanket gets into in oil collecting cavity 9, then discharges in draining hole 4.

This kind can be helped later stage to cool down fluid with the mode of oil-gas mixture.

Because high-pressure air pressure can expand after being discharged from draining hole 4 after being compressed, and then externally do work to make self temperature reduce, just so can cool down the processing to fluid, the fluid that flows back in gear chamber 6 just can cool down the processing to drive gear like this, helps improving the life of part.

The oil drain hole 4 is connected with an oil storage tank, the oil storage tank is communicated with the outside atmosphere, an oil outlet pipe of the oil storage tank is connected with an oil inlet of the gear cavity 6 through a liquid discharge end connected with an oil return pump and an oil return pump, and therefore purified oil can be sent back to the gear cavity 6.

The oil drainage hole 4 is provided with a flow meter for detecting the flow of liquid and gas, the flow meter is electrically connected with the input end of the alarm, and when the flow reaches a preset value, the alarm sends out an alarm signal so as to warn a worker.

The caliber of the inner end part of the oil drain hole 4 is larger than that of the outer end part, and the oil-gas mixture can be extruded by the tapered channel, so that the oil and the gas can be fully mixed.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A high-reliability sealing structure for a supercharger is characterized by comprising a connecting channel which is arranged between a gear cavity (6) and a rotor cavity (5) in a penetrating way, and a transmission shaft (7) which is arranged in the connecting channel in a penetrating way;

one side of the transmission shaft (7) close to the gear cavity (6) is fixedly connected with the inner wall of the connecting channel through at least one double-row ball bearing (8);

an oil seal assembly is arranged on the transmission shaft (7) close to one side of the rotor cavity (5);

the oil seal assembly comprises at least two oil seals arranged at a certain interval, two adjacent oil seals and the inner wall of the connecting channel construct an oil collecting cavity (9) for caching oil which passes through the oil seals, and the side wall of the connecting channel is provided with oil draining holes (4) which are communicated with the oil collecting cavity (9) and outside.

2. The high reliability seal structure for a supercharger according to claim 1, wherein the groove face of the oil seal faces the gear chamber (6).

3. The high-reliability sealing structure for the supercharger according to claim 1, wherein the oil drain hole (4) is connected with an oil storage tank, a filter screen for filtering oil is arranged inside the oil storage tank, an oil outlet pipe of the oil storage tank is connected with an oil return pump, and a liquid discharge end of the oil return pump is connected with an oil inlet of the gear cavity (6).

4. The high-reliability sealing structure for a supercharger according to claim 3, wherein the filter net is tapered.

5. The high-reliability sealing structure for the supercharger according to claim 1, wherein a flow meter for detecting the flow of liquid and gas is arranged at the oil drain hole (4), and the flow meter is electrically connected with an input end of an alarm.

6. The high reliability seal structure for a supercharger according to claim 1, wherein an inner end portion caliber of the oil release hole (4) is larger than an outer end portion caliber.