CN112555667B

CN112555667B - Lubricating oil system and engine test device

Info

Publication number: CN112555667B
Application number: CN202011499842.8A
Authority: CN
Inventors: 陈曦; 张博; 向凤光
Original assignee: Southwest University of Science and Technology
Current assignee: Southwest University of Science and Technology
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2024-06-21
Anticipated expiration: 2040-12-17
Also published as: CN112555667A

Abstract

The invention provides a lubricating oil system and an engine test device. The lubricating oil system comprises an oil storage container, an oil supply pipeline, an oil return pipeline and a valve group, wherein two ends of the oil supply pipeline are respectively connected with the oil storage container and the test section, and two ends of the oil return pipeline are respectively connected with the oil storage container and the valve group; the valves include two returns the oil valve, return the output and return the oil line connection of oil valve, return the input and test section connection of oil valve, and two return the relative setting of input of oil valve, return the oil valve and include first valve body and first case, and first case can be under self gravity effect at the inside motion of first valve body to make the oil valve open or close. The engine test device comprises the lubricating oil system, a plurality of valve groups are arranged, the valve groups are connected to the supporting seat, and the valve groups are distributed along the circumferential direction of the supporting seat. The lubricating oil system and the engine test device provided by the invention have high oil return efficiency and are not easy to cause difficult oil return.

Description

Lubricating oil system and engine test device

Technical Field

The invention relates to the technical field of aeroengine testing, in particular to a lubricating oil system and an engine testing device.

Background

At present, some researchers can use some attitude test tables to carry out simulation tests on an engine or some parts to be tested of the engine, and the test tables can simulate yaw, pitch, roll and other maneuvering actions of an airplane in the actual flight process. During the test of the engine, it is necessary to supply lubricating oil or pressure oil to a bearing or a squeeze film damper or the like mounted on a test stand. However, the test bed is deflected in different directions or angles in the running process, so that the oil return difficulty of the lubricating oil system connected with the test bed is easy to occur, and the normal running of an engine test is influenced.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an oil system which can smoothly return oil when the test section deflects.

The invention further provides an engine test device with the lubricating oil system.

An embodiment of a lubricating oil system according to the first aspect of the present invention comprises: an oil storage container capable of storing the lubricating oil; the two ends of the oil supply pipeline are respectively connected with the oil storage container and the test section; the oil return pipeline is connected with the oil storage container; the valve bank, the valve bank includes two oil return valves, the output of oil return valve with return line is kept away from the one end of oil storage container is connected, the input of oil return valve is connected with the test section, and two the input of oil return valve sets up relatively, the oil return valve includes first valve body and first case, first case is installed inside the first valve body, first case can be under self gravity effect first valve body internal motion, so that the oil return valve opens or closes.

The lubricating oil system provided by the embodiment of the invention has at least the following beneficial effects: under the condition that the test section is deviated and inclined, the first valve core of one oil return valve slides under the action of self gravity, so that the oil return valve is in an open state, lubricating oil can still effectively contact at least one oil return valve and enter an oil return pipeline through the oil return valve to realize oil return, and the phenomenon of difficult oil return is avoided.

According to some embodiments of the present invention, the first valve body and the first valve core are both hollow, the first valve body includes an oil seal portion, the oil seal portion is disposed inside the first valve body, and the oil seal portion is connected to a side wall of the first valve body, an oil passing hole through which the lubricating oil can pass is formed in the oil seal portion, a valve oil return hole through which the lubricating oil can pass is formed in the side wall of the first valve core, and an end portion of the first valve core can abut against the oil seal portion to close the oil passing hole.

According to some embodiments of the invention, the lubricating oil system comprises a bearing oil supply nozzle and a damper oil supply nozzle, wherein the bearing oil supply nozzle and the damper oil supply nozzle are both connected to one end of the oil supply pipeline, which is far away from the oil storage container, and the bearing oil supply nozzle and the damper oil supply nozzle are both embedded in the test section.

According to some embodiments of the invention, the oil system further comprises a scavenge pump disposed on the scavenge line for driving the flow of oil along the scavenge line into the oil reservoir.

According to some embodiments of the invention, the oil system further comprises an overflow pipeline and an overflow valve, wherein two ends of the overflow pipeline are respectively connected with the oil supply pipeline and the oil return pipeline, the overflow valve is arranged on the overflow pipeline, and the overflow valve is used for controlling on-off of the overflow pipeline.

According to some embodiments of the invention, the lubricating oil system further comprises a return oil cooler arranged on the return line, the return oil cooler being capable of cooling the lubricating oil in the return line.

An engine test apparatus according to an embodiment of the second aspect of the present invention includes a lubricating oil system as described above.

The basic rotating mechanism dynamics test device provided by the embodiment of the invention has at least the following beneficial effects: difficult oil return, high oil return efficiency and lower failure rate.

According to some embodiments of the invention, the engine test device comprises a supporting seat and a pressure balance valve, wherein an oil collecting cavity capable of containing the lubricating oil is arranged in the supporting seat, an output end of the pressure balance valve and an input end of the oil return valve are connected with the supporting seat, and the pressure difference between the input end and the output end of the pressure balance valve can enable the pressure balance valve to be opened or closed.

According to some embodiments of the invention, the air pressure balance valve comprises a second valve core, a second valve body and an elastic piece, wherein the second valve core and the second valve core are both arranged in a hollow mode, the second valve core and the elastic piece are both arranged in the second valve body, the second valve core comprises an air sealing part, the air sealing part is arranged in the second valve body, the air sealing part is connected with the side wall of the second valve body, the air sealing part is provided with an air passing hole, the side wall of the second valve core is provided with an air pressure balance hole, and the elastic piece can enable the end part of the second valve core to be in a propped state with the air sealing part so as to seal the air passing hole.

According to some embodiments of the invention, the engine test apparatus comprises a support base, a plurality of valve groups are provided, the plurality of valve groups are all connected to the support base, and the plurality of valve groups are distributed along the circumferential direction of the support base.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a simplified schematic diagram of an engine test apparatus in some embodiments;

FIG. 2 is an oil circuit diagram of an oil system in some embodiments;

FIG. 3 is a schematic illustration of an oil supply line in the oil system shown in FIG. 2;

FIG. 4 is a schematic illustration of an oil return line in the oil system shown in FIG. 2;

FIG. 5 is a schematic perspective view of an integrated oil station in some embodiments;

FIG. 6 is a partial schematic view of the integrated oil station of FIG. 5 at another angle;

FIG. 7 is a front view of a test section in some embodiments;

FIG. 8 is a top view of the test section shown in FIG. 7;

FIG. 9 is a schematic perspective view of a bearing block in some embodiments;

FIG. 10 is a partial cross-sectional view of a bearing support in some embodiments;

FIG. 11 is a schematic diagram of a state change of the oil return valve in some embodiments;

FIG. 12 is a schematic diagram of the internal structure of a pneumatic balance valve in some embodiments;

FIG. 13 is a top view of a bearing block in some embodiments;

FIG. 14 is a cross-sectional view of the bearing block shown in FIG. 13 taken along section A-A;

FIG. 15 is a cross-sectional view of the bearing support shown in FIG. 13 taken along section B-B (with the bearing installed);

FIG. 16 is a front view of a bearing block in some embodiments;

Fig. 17 is a cross-sectional view of the bearing support shown in fig. 16 taken along section C-C.

Reference numerals: 101-test section, 102-turntable, 201-integrated oil station, 202-oil storage container, 203-oil supply pipeline, 204-oil return pipeline, 205-valve block, 206-bearing, 207-level gauge, 208-tank thermometer, 209-air filter, 210-oil supply pump, 211-oil suction filter, 212-oil supply filter, 213-electrohydraulic proportioning valve, 214-fine filter, 215-pressure transmitter, 216-oil return pump, 217-overflow pipeline, 218-oil return temperature sensor, 219-oil return cooler, 220-oil return filter, 221-overflow valve, 222-overflow pressure gauge, 223-hose, 224-oil supply temperature sensor, 225-oil drain valve, 701-base, 703-rotor test piece, 704-driving motor, 901-oil return valve, 902-air pressure balance valve, 1001-oil collecting cavity, 1101-first valve body, 1102-first valve core, 1103-oil seal part, 1104-oil passing hole, 1105-valve oil return hole, 1201-second valve body, 1202-second valve core, 1203-elastic piece, 1204-air seal part, 1205-limit part, 1206-air passing hole, 1207-air pressure balance hole, 1401-first mounting cavity, 1402-first oil nozzle mounting hole, 1403-bearing oil supply flow channel, 1404-process blind hole, 1405-supporting seat oil return hole, 1406-second mounting cavity, 1501-bearing, 1701-second oil nozzle mounting hole, 1702-damper oil supply flow channel.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, several means one or more, and plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, 7 and 8, a rotor test piece 703 to be tested (i.e., a component to be tested of an engine) is mounted on a test section 101, the test section 101 is mounted on a multi-axis rotatable turntable 102, and an oil system is connected to the test section 101 for supplying lubricating oil to the test section 101. Referring to fig. 7 to 9, the test section 101 includes a base 701, a supporting seat 206, and a driving motor 704, where the supporting seat 206 and the driving motor 704 are mounted on the base 701, and the driving motor 704 is connected (may specifically be connected by a coupling, not shown in detail) to the rotor test piece 703, and the driving motor 704 is used to drive the rotor test piece 703 to rotate. Referring to fig. 13 to 15, the bearing block 206 includes a first mounting chamber 1401, a bearing 1501 for supporting a rotating shaft of the rotor test piece 703, and a squeeze film damper (not shown) for damping may be installed in the first mounting chamber 1401, and the squeeze film damper may be sleeved on an outer circumference of the bearing 1501. The lubricating oil system mainly supplies oil to the bearing 1501 and the squeeze film damper, and it is to be noted that, for the bearing 1501, the lubricating oil provided by the lubricating oil system plays a role in lubricating, and for the squeeze film damper, the lubricating oil provided by the lubricating oil system is mainly used for forming an oil film between an inner ring and an outer ring of the squeeze film damper. The specific construction of bearings and squeeze film dampers is well known and will not be described in detail herein.

Referring to fig. 2 to 6, the present invention provides an oil system including an oil reservoir 202, an oil supply line 203, an oil return line 204, and a valve block 205. The oil reservoir 202 is for storing lubricating oil; two ends of the oil supply pipeline 203 are respectively connected with the oil storage container 202 and the test section 101; one end of the oil return pipeline 204 is connected with the oil storage container 202, the other end of the oil return pipeline 204 is connected with the valve group 205, and the valve group 205 is connected with the test section 101. Referring to fig. 9 and 10, the valve block 205 includes two return valves 901, the input ends of the return valves 901 are connected to the test stand, the output ends of the return valves 901 are connected to the return line 204 (the two return valves 901 are connected in parallel), and the input ends of the two return valves 901 are disposed opposite to each other. Referring to fig. 9, one oil return valve 901 is mounted on each of the left and right sides of the support base 206 at the same angular position, and referring to fig. 10, the input end of the left oil return valve 901 faces to the right, and the input end of the right oil return valve 901 faces to the left. The oil return valve 901 includes a first valve body 1101 and a first spool 1102, the first spool 1102 being mounted inside the first valve body 1101, the first spool 1102 being movable under the action of its own weight to open or close the oil return valve 901.

The "input end" and the "output end" of the oil return valve 901 are based on the flow direction of the lubricating oil, the end of the oil return valve 901 into which the lubricating oil flows is the input end, the end of the oil return valve 901 from which the lubricating oil flows is the output end, and as illustrated in fig. 11, the input end of the oil return valve 901 corresponds to the left end of the oil return valve 901, and the output end of the oil return valve 901 corresponds to the right end of the oil return valve 901. In addition, for the oil return line 204, the oil supply line 203, and other lines in the present invention, the "line" may be a single pipe or a pipe group formed by connecting a plurality of pipes.

Referring to fig. 11, in some embodiments, the first valve body 1101 and the first valve core 1102 are both hollow, the first valve body 1101 has an oil seal portion 1103 therein, the oil seal portion 1103 is connected to a side wall of the first valve body 1101, an oil passing hole 1104 is formed in the oil seal portion 1103, an end portion of the first valve core 1102 can abut against the oil seal portion 1103 to close the oil passing hole 1104, and a valve oil return hole 1105 is formed in the side wall of the first valve core 1102. Referring to the upper half of fig. 11, when the end of the first spool 1102 abuts against the oil seal 1103, the oil passage 1104 is closed by the first spool 1102, the lubricating oil cannot pass through the oil passage 1104, the lubricating oil cannot flow from the input end of the oil return valve 901 to the output end of the oil return valve 901, and the oil return valve 901 is in a closed state at this time. Referring to the lower half of fig. 11, when the output end of the return valve 901 is inclined and directed downward to the right (the same effect can be achieved with the output end of the return valve 901 directed downward or downward to the left), the return valve 901 is in an open state. The first spool 1102 slides toward the output end of the oil return valve 901 by its own weight, the end of the first spool 1102 is separated from the oil seal 1103, and the lubricating oil can pass through the oil passing hole 1104. After passing through the oil hole 1104, the lubricating oil enters the cavity inside the first valve core 1102 from the valve oil return hole 1105 in the side wall of the first valve core 1102, and the lubricating oil inside the first valve core 1102 can flow directly to the output end of the oil return valve 901.

The lubricating oil delivered to the test section 101 specifically flows to the supporting seat 206, after entering the supporting seat 206, the lubricating oil flows to the bearing and the squeeze film damper through some flow passages in the supporting seat 206, the lubricating oil flowing through the bearing and the squeeze film damper subsequently flows to the oil collecting cavity 1001 (the position of the oil collecting cavity 1001 can be referred to as fig. 10) in the supporting seat 206 through some flow passages in the supporting seat 206, and the lubricating oil in the oil collecting cavity 1001 subsequently enters the oil return pipeline 204 through the oil return valve 901 and flows back to the oil storage container 202 along the oil return pipeline 204. When the test section 101 tilts or deflects under the action of the turntable 102, the lubricating oil in the oil collecting cavity 1001 can still effectively contact the oil return valve 901. Taking fig. 10 as an example, for the right-side oil return valve 901, the left end is an input end, and the right end is an output end; the left-side oil return valve 901 has an input end at the right end and an output end at the left end. Since the liquid level of the lubricating oil is kept horizontal, when the upper end of the support base 206 is inclined to the left by a large angle, the left oil return valve 901 is in contact with the lubricating oil, the right oil return valve 901 is not in contact with the lubricating oil, and at this time, the output end of the left oil return valve 901 is directed to the left lower side, the output end of the right oil return valve 901 is directed to the right upper side, the left oil return valve 901 is in an open state, the right oil return valve 901 is in a closed state, and the lubricating oil flows out from the left oil return valve 901. Similarly, when the upper end of the support base 206 is inclined to the right by a large angle, the oil return valve 901 on the right side is in contact with the lubricating oil and is in an open state, and the lubricating oil flows out from the oil return valve 901 on the right side. Therefore, in the lubricating oil system, under the condition that the test section 101 is deviated and inclined, lubricating oil can still effectively contact at least one oil return valve 901 and enter the oil return pipeline 204 through the oil return valve 901 to realize oil return, so that difficult oil return is avoided.

In some embodiments, the lubrication system includes a bearing and damper nozzle (not shown in detail) that are each connected to an end of the oil supply line 203 remote from the reservoir 202 through which lubrication oil may be sprayed or tapped. Referring to fig. 13 and 14, the support base 206 has a first nipple mounting hole 1402 and a bearing oil supply flow path 1403, the first nipple mounting hole 1402 communicates with the bearing oil supply flow path 1403, the bearing oil supply nipple is embedded in the first nipple mounting hole 1402, and lubricating oil enters the bearing oil supply flow path 1403 after being ejected from the bearing oil supply nipple; an oil injection ring (not shown) is provided at the outlet of the bearing oil supply flow passage 1403, and the oil flowing out of the bearing oil supply flow passage 1403 flows to the oil injection ring, which injects oil to the bearing (from right to left based on the direction of fig. 14). A portion of the oil spray ring and rotor test piece 703 would be mounted in the second mounting chamber 1406. It should be noted that, in fig. 14, the process blind hole 1404 is located above the first nozzle mounting hole 1402, and the process blind hole 1404 is plugged when in actual use, so that lubricating oil does not flow to the process blind hole 1404. Similarly, referring to fig. 16 and 17, the support has a second nozzle mounting hole 1701 and a damper oil supply runner 1702, the damper oil supply runner 1702 is embedded in the second nozzle mounting hole 1701, the damper oil supply runner 1702 is located below the second nozzle mounting hole 1701, and the damper oil supply runner 1702 communicates with the second nozzle mounting hole 1701 (above the second nozzle mounting hole 1701 is a blind process hole 1404). The outlet of the damper oil supply flow passage 1702 is located on the side wall of the first installation cavity 1401, and the lubricating oil flowing out of the damper oil supply flow passage 1702 can enter the squeeze film damper through the oil inlet hole on the outer wall of the outer ring of the squeeze film damper. After the lubricating oil flows through the bearing and presses the oil film damper, it enters the oil collecting chamber 1001 through a plurality of support base oil return holes 1405 on the side wall of the first installation chamber 1401 (the channel trend of the support base oil return holes 1405 is not shown in detail).

The entire flow path of the lubricating oil will be described with reference to fig. 2. The engine test device comprises an integrated oil station 201, a turntable 102 and a test section 101, wherein the test section 101 is arranged on the turntable 102, the integrated oil station 201 and the test section 101 which are mutually separated are connected through a hose 223 (for example, the hose 223 can be made of plastic materials), and the hose 223 is relatively difficult to damage when the turntable 102 tilts and rotates. The various components of the oil system are distributed in different locations or areas, some components that are not suitable to withstand vibrations or to switch postures frequently may be provided in the integrated oil station 201, for example the oil reservoir 202 may be provided in the integrated oil station 201. The integrated oil station 201 comprises a liquid level meter 207, an oil tank thermometer 208 and an air filter 209, wherein the liquid level meter 207 is used for detecting the liquid level of the oil storage container 202, the oil tank thermometer 208 is used for detecting the temperature of lubricating oil in the oil storage container 202, and the air filter 209 is used for filtering air so as to prevent impurities in the air from entering the oil storage container 202 to pollute the lubricating oil. The lubricating system further comprises an oil drain valve 225, wherein the oil drain valve 225 is connected with the oil storage container 202, and when the lubricating oil in the oil storage container 202 needs to be replaced, the old lubricating oil can be drained by opening the oil drain valve 225. The integrated oil station 201 further includes an oil feed pump 210, an oil suction filter 211, an oil feed filter 212, an electro-hydraulic proportional valve 213, an oil feed temperature sensor 224, a fine filter 214, and a pressure transmitter 215. The oil feed pump 210 pumps the lubricating oil from the oil reservoir 202, the lubricating oil passes through the oil suction filter 211 and then enters the oil feed pump 210, and the lubricating oil output from the oil feed pump 210 passes through the oil feed filter 212 subsequently; the lubricating oil then flows through electro-hydraulic proportional valve 213, fine filter 214, and pressure transducer 215 in that order, and into bearing block 206. The electro-hydraulic proportional valve 213 is mainly used for controlling the hydraulic pressure and flow rate of the lubricating oil, the fine filter 214 is used for filtering the lubricating oil again before the lubricating oil enters the supporting seat 206, the pressure transmitter 215 is used for detecting the pressure of the lubricating oil before the lubricating oil enters the supporting seat 206, and the detected pressure value can be used for controlling the opening degree of the electro-hydraulic proportional valve 213. The oil supply temperature sensor 224 is used to detect an actual oil supply temperature.

The oil system further comprises a scavenge pump 216, the scavenge pump 216 being arranged on the scavenge line 204, the scavenge pump 216 being adapted to each valve group 205 to one scavenge pump 216 as a result of driving oil along the scavenge line 204 to the oil reservoir 202. Referring to fig. 7, the scavenge pump 216 can be mounted specifically on the base 701 of the test section 101, and a portion of the scavenge line 204 can also be mounted on the base 701. Providing the scavenge pump 216 can prevent the lubricant from flowing back normally as compared to the lubricant flowing spontaneously. The lubricating oil system further comprises an oil return cooler 219 and an oil return filter 220, wherein lubricating oil flowing out of the oil return pump 216 flows back to the oil storage container 202 along the oil return pipeline 204, and the lubricating oil flows through the oil return cooler 219 and the oil return filter 220 in sequence in the process of oil return; the oil return cooler 219 is used for cooling the returned oil to avoid overheat denaturation of the oil, and the oil return filter 220 is used for filtering the returned oil. The oil return cooler 219 may be a plate heat exchanger, a tube heat exchanger, or the like, and the cooling medium may be water. The return line 204 is further provided with a return oil temperature sensor 218 for measuring the temperature of the return oil, and the power of the return oil cooler 219 can be adjusted by comparing the temperature value detected by the return oil temperature sensor 218 with the target cooling temperature value of the oil.

In some embodiments, the lubricating oil system further comprises an overflow line 217 and an overflow valve 221, two ends of the overflow line 217 are respectively connected with the oil supply line 203 and the oil return line 204, and the overflow valve 221 for controlling the on-off of the overflow line 217 is arranged on the overflow line 217. An overflow pressure gauge 222 is arranged at the joint of the overflow pipeline 217 and the oil supply pipeline 203, when the pressure value measured by the overflow pressure gauge 222 is higher than a preset value, the overflow valve 221 is opened, part of lubricating oil flows to the oil return pipeline 204 along the overflow pipeline 217, and then flows back to the oil storage container 202 from the oil return pipeline 204; after some of the lubrication oil is diverted along relief line 217, the pressure and flow rate of the lubrication oil flowing to bearing block 206 are reduced, avoiding excessive pressure or flow rate of the lubrication oil provided to bearing block 206.

The invention also provides an engine test device which comprises the lubricating oil system disclosed by the embodiment, and the engine test device is difficult to return oil, high in oil return efficiency and low in failure rate. Specifically, referring to fig. 1, the engine test apparatus includes a grease system, a turntable 102, and a test section 101, a rotor test piece 703 to be tested (i.e., a component to be tested of the engine) is mounted on the test section 101, the test section 101 is mounted on the turntable 102 rotatable along multiple axes, the grease system is connected to the test section 101, and the grease system is used for providing the test section 101 with lubricating oil. The engine test device also comprises a measurement and control system, a water cooling system, an air system and a video monitoring system. The water cooling system is used for cooling the high-speed driving motor on the test section 101, the air system is used for providing compressed air for the engine or the engine part to be tested for sealing, and the video monitoring system is used for monitoring the real-time condition of the test. And the measurement and control system is used for controlling the running of the lubricating oil system, the water cooling system, the air system, the test section and the turntable.

In some embodiments, the engine test apparatus includes a plurality of valve banks 205, the plurality of valve banks 205 being distributed along the circumference of the bearing block 206. Taking fig. 9 as an example, on a single support seat 206, the valve group 205 is provided with 3 (i.e. 6 oil return valves 901 in total), which is advantageous for efficient oil return of the oil system when the support seat 206 is in a more complex inclined state.

In the case where the scavenging pump 216 is provided, the continuous operation of the scavenging pump 216 and the continuous flow of lubricating oil out of the oil collecting chamber 1001 tend to cause the air pressure in the oil collecting chamber 1001 to be too low, and the oil scavenging difficulty also occurs when the air pressure in the oil collecting chamber 1001 is too low. To address this issue, in some embodiments, the engine test apparatus includes a barometric pressure balance valve 902, the output of the barometric pressure balance valve 902 is connected to the support base 206, the input of the barometric pressure balance valve 902 is exposed to the atmosphere, the cavity of the barometric pressure balance valve 902 can be in communication with the oil collection chamber 1001, when the barometric pressure in the oil collection chamber 1001 is too low, the barometric pressure balance valve 902 is opened, and air can enter the oil collection chamber 1001 through the barometric pressure balance valve 902, thereby compensating for the barometric pressure in the oil collection chamber 1001. The air pressure balance valve 902 in this way is simple and reliable, and an air pressure sensor and a complicated air pressure compensation control system are not required to be arranged in an engine test device.

Specifically, referring to fig. 9, 10, and 12, the air pressure balance valve 902 includes a second valve body 1201, a second valve body 1202, and an elastic member 1203, both of which are mounted within the second valve body 1201, the second valve body 1202 being movable relative to the second valve body 1201. The second valve body 1201 comprises a gas sealing part 1204 and a limiting part 1205, the gas sealing part 1204 and the limiting part 1205 are both positioned in the second valve body 1201, the center of the gas sealing part 1204 is provided with a gas passing hole 1206, two ends of the elastic member 1203 are respectively propped against the second valve core 1202 and the limiting part 1205, under the elastic force of the elastic member 1203, the end part of the second valve core 1202 is kept in a propped state with the gas sealing part 1204, the gas passing hole 1206 is in a closed state, and air cannot pass through the air pressure balance valve 902. When the air pressure in the oil collecting chamber 1001 decreases to a certain extent, the external air pressure is higher than the air pressure in the oil collecting chamber 1001, the elastic member 1203 is compressed, the second valve element 1202 moves toward the output end of the air pressure balance valve 902 under the pressure difference, and at this time, the end of the second valve element 1202 is separated from the air seal portion 1204, and air can pass through the air passing hole 1206. The second valve core 1202 is also hollow, the side wall of the second valve core 1202 is provided with an air pressure balancing hole 1207, air passing through the air pressure balancing hole 1206 can enter the second valve core 1202 from the air pressure balancing hole 1207, and air entering the second valve core 1202 can then flow into the oil collecting cavity 1001 directly from the output end of the air pressure balancing valve 902. After the air pressure value of the oil collecting cavity 1001 returns to the normal range, the elastic member 1203 returns to its original length and pushes the second valve element 1202 to move until the end of the second valve element 1202 abuts against the air sealing portion 1204, and when the end of the second valve element 1202 abuts against the air sealing portion 1204, the air pressure balance valve 902 is closed.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims

1. The lubricating oil system, engine test device include the test section, and the rotor test piece that waits to test is installed on the test section, lubricating oil system is used for providing lubricating oil for the test section, its characterized in that includes:

an oil storage container capable of storing the lubricating oil;

the two ends of the oil supply pipeline are respectively connected with the oil storage container and the test section;

The oil return pipeline is connected with the oil storage container;

The valve bank, the valves includes two oil return valves, the output of oil return valve with the oil return pipeline is kept away from the one end of oil storage container is connected, the input of oil return valve with test section is connected, and two the input of oil return valve is relative to set up, test section includes the bearing, the inside of bearing has can the holding oil collecting chamber of lubricating oil, the input of oil return valve with the bearing is connected, install respectively on the same angular position of left and right sides face of bearing an oil return valve, left side the input of oil return valve is towards the right side, the right side the input of oil return valve is towards left, the oil return valve includes first valve body and first case, first case is installed inside the first valve body, first case can be under self gravity effect the inside motion of first valve body, so that the oil return valve opens or closes, first case with first case all cavity setting, first includes the oil seal portion, the first case is in the same angular position of left side face, right side the input of oil return valve is towards the left side, first case is installed to the first case, and the oil seal portion can be passed through the oil seal portion the valve body the oil feed port can be closed with the side wall is closed to the valve body.

2. The oil system of claim 1, wherein the oil system comprises a bearing oil supply nozzle and a damper oil supply nozzle, both of which are connected at an end of the oil supply line remote from the oil reservoir, both of which are embedded in the test section.

3. The oil system of claim 1, further comprising a scavenge pump disposed on the scavenge line for driving the flow of lubricating oil along the scavenge line into the oil reservoir.

4. The oil system of claim 1, further comprising an overflow line and an overflow valve, wherein two ends of the overflow line are respectively connected to the oil supply line and the oil return line, the overflow valve is disposed on the overflow line, and the overflow valve is used for controlling on-off of the overflow line.

5. The oil system according to any one of claims 1 to 4, further comprising a return oil cooler provided on the return line, the return oil cooler being capable of cooling the lubricating oil in the return line.

6. Engine test apparatus, characterized by comprising a lubricating oil system according to any one of claims 1 to 5.

7. The engine test apparatus of claim 6, wherein the engine test apparatus includes a support seat and a pressure balance valve, an output of the pressure balance valve being connected to the support seat, a pressure differential between an input and an output of the pressure balance valve being variable to enable the pressure balance valve to be opened or closed.

8. The engine test device according to claim 7, wherein the air pressure balance valve comprises a second valve core, a second valve body and an elastic member, the second valve body and the second valve core are all arranged in a hollow mode, the second valve core and the elastic member are all arranged inside the second valve body, the second valve core comprises an air sealing portion, the air sealing portion is arranged inside the second valve body, the air sealing portion is connected with the side wall of the second valve body, the air sealing portion is provided with an air passing hole, the side wall of the second valve core is provided with an air pressure balance hole, and the elastic member can enable the end portion of the second valve core to be in a propped state with the air sealing portion so as to seal the air passing hole.

9. The engine test apparatus of claim 6, wherein the engine test apparatus includes a support base, the valve block is provided in plurality, the plurality of valve blocks are connected to the support base, and the plurality of valve blocks are distributed along a circumferential direction of the support base.