Fire protection test device and method for multiple lubricating oil pumps

Abstract

The invention discloses a fire prevention test device and method for a multi-connected lubricating oil pump, comprising a simulation shell, a multi-connected lubricating oil pump, a boosting stage circulating oil circuit and an oil return stage circulating oil circuit, wherein the multi-connected lubricating oil pump comprises a boosting pump and a multi-stage oil return pump, the oil discharge port of the boosting pump is connected with the oil supply end of the boosting stage circulating oil circuit, the oil suction port of the boosting pump is connected with the oil return end of the boosting stage circulating oil circuit, a boosting stage oil through groove is provided in the boosting pump, an oil collecting chamber is provided in the simulation shell, the oil supply end of the oil return stage circulating oil circuit is respectively connected with the oil discharge port of the multi-stage oil return pump, the oil return pump is provided with an oil return stage oil through groove, and a throttle nozzle is arranged on the oil circuit connecting the oil suction port of the oil return pump in the simulation shell and the oil collecting chamber; compared with the prior art, the requirements for the test bench are low (the test bench does not need to be powered), the related equipment and piping system are simplified, and the risk of unsuccessful fire prevention test of the multi-connected lubricating oil pump caused by factors such as high requirements for the test bench, complex equipment and piping system, etc. is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fire prevention test of lubricating oil pumps, and in particular to a fire prevention test device for multiple lubricating oil pumps. In addition, the present invention also relates to a fire prevention test method for multiple lubricating oil pumps using the fire prevention test device for multiple lubricating oil pumps. Background Art

[0002] According to Article 33.17 of the Aircraft Engine Airworthiness Regulations, every external pipe, joint and other component that retains or transports flammable liquids during normal engine operation must be confirmed by the Civil Aviation Administration of China to be fire-resistant or fireproof. Therefore, for civil engine lubricating oil systems that do not have a shut-off valve at the outlet of the lubricating oil tank, it is usually necessary to conduct a lubricating oil pump fire protection test to verify whether the fire protection performance of the lubricating oil pump meets the requirements. The lubricating oil pump in the civil engine lubricating oil system is usually a multi-unit lubricating oil pump. For the fire protection test of the multi-unit lubricating oil pump group, the commonly used test method is to connect the multi-unit lubricating oil pump to a power source such as a motor or a gearbox. During the test, the power source drives the pump body in the multi-unit lubricating oil pump to rotate to realize the circulation of the lubricating oil.

[0003] However, if Figure 1 As shown in the figure, for the current fire prevention test of multiple lubricating oil pumps (especially high-speed pumps), in order to meet the specified test parameter requirements such as lubricating oil flow rate, pressure, etc., the test must be carried out when the lubricating oil pump is rotating (that is, the flow rate and pressure are generated by the work of the lubricating oil pump itself; if it does not rotate, due to the small gap between the rotor and the partition inside the pump, it is impossible to achieve the lubricating oil circulation of each stage of the pump by relying solely on the external oil source). This puts high demands on the test bench. The test bench must have a reliable power source to drive the multiple lubricating oil pump to work normally during the fire prevention test. However, the existing test benches usually do not have reliable power source conditions, which makes the test resources of the multiple lubricating oil pumps tight and often difficult to meet the progress requirements of the development of related models. At the same time, for test benches with reliable power sources, the complexity of the test equipment is greatly increased due to the power source (in order to avoid the power source being damaged by the test flame during the fire prevention test, the power source needs to be insulated or physically isolated), and the test cost and difficulty are increased. In addition, Figure 2 As shown, when the multi-stage lubricating oil pump is tested in a rotating state, each stage of the pump needs to be connected to the corresponding pipeline, which makes the entire test pipeline system very complicated, the number of pipeline joints on the transition section increases, the number of sealing parts increases, and the risk of liquid medium leakage increases, which further increases the difficulty of the fire test and increases the risk of the fire test. Summary of the invention

[0004] The present invention provides a multiple lubricating oil pump fire prevention test device and method to solve the technical problems that the existing multiple lubricating oil pump fire prevention test has high requirements on the test bench (needs a power source and related protective equipment), high test cost and test difficulty, and high test risk.

[0005] According to one aspect of the present invention, a multi-connected lubricating oil pump fire prevention test device is provided, comprising a simulated housing for simulating an engine casing and connected to a test bench, a multi-connected lubricating oil pump arranged on the simulated housing, a booster stage circulating oil circuit connected to the simulated housing, and an oil return stage circulating oil circuit connected to the simulated housing, the multi-connected lubricating oil pump comprising a booster pump and a multi-stage oil return pump, the oil discharge port of the booster pump is connected to the oil supply end of the booster stage circulating oil circuit, the oil suction port of the booster pump is connected to the return end of the booster stage circulating oil circuit The oil end is connected, a booster stage oil through groove which is respectively connected with the oil suction port and the oil discharge port is provided in the booster pump, an oil collecting chamber which is respectively connected with the oil suction port of the multi-stage return oil pump and the return oil end of the return oil stage circulating oil circuit is provided in the simulation shell, the oil supply end of the return oil stage circulating oil circuit is respectively connected with the oil discharge port of the multi-stage return oil pump, an oil return stage oil through groove which is respectively connected with the oil suction port and the oil discharge port is provided in the oil return pump, and a throttle nozzle is arranged on the oil circuit which is connected with the oil suction port of the return oil pump in the simulation shell and the oil collecting chamber.

[0006] As a further improvement of the above technical solution:

[0007] Furthermore, the return oil pump is arranged in four stages, and the throttle nozzles and the return oil pumps are arranged one by one. The flow rates of the four throttle nozzles during the fire test of the multi-connected lubricating oil pump are W1, W2, W3 and W4, respectively. The corresponding throttle nozzle diameters are ΦA, ΦB, ΦC, ΦD, respectively. The flow rate calculation formula of the throttle nozzle is:

[0008] ;

[0009] ;

[0010] in, W is the throttle flow rate, C d is the flow coefficient, d is the diameter of the throttle nozzle (120), is the pressure difference before and after the throttle nozzle, ρ is the density of lubricating oil, ΦA is Φ1.5mm~Φ2mm.

[0011] Furthermore, the simulation housing includes a mounting surface 1 connected to the multi-unit lubricating oil pump and a mounting surface 2 arranged opposite to the mounting surface 1, four oil passages are opened on the mounting surface, the throttle nozzle is arranged on the oil passage, and pipe joint 1, pipe joint 2, pipe joint 3 and pipe joint 4 are arranged on the mounting surface 2, pipe joint 1 is respectively connected to the oil discharge port of the boost pump and the oil supply end of the boost stage circulating oil circuit, pipe joint 2 is respectively connected to the oil suction port of the boost pump and the oil return end of the boost stage circulating oil circuit, pipe joint 3 is respectively connected to the oil return end of the return oil stage circulating oil circuit and the oil collecting chamber, and pipe joint 4 is respectively connected to the oil supply end of the return oil stage circulating oil circuit and the oil discharge port of the multi-stage return oil pump.

[0012] Furthermore, the boost stage circulating oil circuit includes a boost stage oil tank, a boost stage oil supply assembly respectively connected to the oil outlet of the boost stage oil tank and the oil discharge port of the boost pump, and a boost stage oil return assembly respectively connected to the oil return port of the boost stage oil tank and the oil suction port of the boost pump.

[0013] Furthermore, the boost stage oil supply assembly includes a pump station 1 connected to the oil outlet of the boost stage oil tank, an oil supply pipe 1 connected to the oil discharge port of the boost pump and the pump station 1 respectively, a regulating valve 1 connected to the oil supply pipe 1 and the boost stage oil tank respectively, a flow meter 1 arranged on the oil supply pipe 1, a platinum resistor 1 arranged on the oil supply pipe 1 and a pressure gauge 1 arranged on the oil supply pipe 1.

[0014] Furthermore, the boost stage oil return assembly includes an oil return pipe 1 connected to the oil suction port of the boost pump and the oil return port of the boost stage oil tank respectively, a regulating valve 2 arranged on the oil return pipe 1, and a vent valve 1 arranged on the oil return pipe 1.

[0015] Furthermore, the return oil stage circulation oil circuit includes an return oil stage oil tank, an return oil stage oil return assembly respectively connected to the oil return port and the oil collecting chamber of the return oil stage oil tank, and an return oil stage oil supply assembly respectively connected to the oil outlet of the return oil stage oil tank and the oil discharge port of the multi-stage return oil pump.

[0016] Furthermore, the return oil stage oil supply assembly includes a pump station 2 connected to the oil outlet of the return oil stage tank, an oil supply pipe 2 connected to the pump station 2 and the oil discharge port of the multi-stage return oil pump respectively, a regulating valve 3 connected to the oil supply pipe 2 and the return oil stage tank respectively, a flow meter 2 arranged on the oil supply pipe 2, a platinum resistor 2 arranged on the oil supply pipe 2, and a pressure gauge 2 arranged on the oil supply pipe 2.

[0017] Furthermore, the oil return stage oil return assembly includes an oil return pipe 2 respectively connected to the oil return port and the oil collecting chamber of the oil return stage oil tank, a regulating valve 4 arranged on the oil return pipe 2, and a vent valve 2 arranged on the oil return pipe 2.

[0018] According to another aspect of the present invention, a multiple lubricating oil pump fire prevention test method is also provided, which adopts the multiple lubricating oil pump fire prevention test device mentioned above.

[0019] The present invention has the following beneficial effects:

[0020] The multi-connected lubricating oil pump fire prevention test device of the present invention simulates an engine casing through a simulated shell and connects it to a test bench, and then installs a multi-connected lubricating oil pump, a booster stage circulating oil circuit and an oil return stage circulating oil circuit on the simulated shell, so that a fire prevention test can be performed under the condition that the test bench does not need a power source; the oil discharge port of the booster pump is connected with the oil supply end of the booster stage circulating oil circuit, and the oil suction port of the booster pump is connected with the oil return end of the booster stage circulating oil circuit, so that the lubricating oil first flows in from the oil discharge port of the booster pump and then flows out from the oil suction port of the booster pump, and the temperature and pressure of the oil discharge port of the booster pump are ensured by the reverse flow of the lubricating oil Parameters, and a booster stage oil groove connected with the oil suction port and the oil discharge port respectively is opened in the booster pump, so as to realize the circulation of the booster stage lubricating oil when the booster pump is not rotating during the fire prevention test, so as to verify the fire prevention performance of the booster pump; an oil collecting chamber connected with the oil suction port of the multi-stage return oil pump and the return oil end of the return oil stage circulating oil circuit is opened in the simulated shell, and then the oil supply end of the return oil stage circulating oil circuit is connected with the oil discharge port of the multi-stage return oil pump respectively, so that the lubricating oil first flows into the oil discharge port of the multi-stage return oil pump, and then flows out from the oil suction port of the multi-stage return oil pump after merging into the oil collecting chamber. The temperature and pressure parameters of the oil discharge port of the return oil pump are ensured by the reverse flow of lubricating oil. A throttle nozzle is arranged in the oil path connecting the oil suction port and the oil collecting chamber of the return oil pump in the simulated housing, so that the lubricating oil flow distribution in the multi-stage return oil pump can be achieved through the cooperation of the throttle nozzle and the oil collecting chamber, thereby ensuring that the flow in each return oil pump meets the test requirements. At the same time, the piping system is greatly simplified, and the risk of lubricating oil leakage is reduced. The return oil pump is provided with a return oil stage oil groove connected to the oil suction port and the oil discharge port respectively, so that the return oil stage lubricating oil can circulate when the return oil pump is not rotating, thereby achieving Verify the fireproof performance of the return oil pump when the return oil pump is not rotating; Compared with the prior art, this scheme, by respectively opening a booster stage oil groove and a return oil stage oil groove in the booster pump and the return oil pump, and under the action of the booster stage circulating oil circuit and the return oil stage circulating oil circuit, simulates the flow of lubricating oil when the multi-stage lubricating oil pump is working when the multi-stage lubricating oil pump is not rotating, and facilitates the guarantee of the temperature and pressure parameters during the fireproof test to meet the requirements through the reverse flow of lubricating oil, and realizes the distribution of lubricating oil flow in the multi-stage return oil pump through the coordination of the throttle nozzle and the oil collecting chamber to ensure that the flow parameters meet the requirements. Compared with the prior art, the requirements for the test bench are low (the test bench does not need to be equipped with a power source and related protective equipment), the piping system is simplified, and the risk of unsuccessful fireproof test of the multi-stage lubricating oil pump due to high requirements for the test bench (the test bench needs to be equipped with a power source and related protective equipment) and complex piping system is greatly reduced. It is highly practical and suitable for wide promotion and application.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the lubricating oil flow of a multi-connected lubricating oil pump in the prior art;

[0024] Figure 2 It is a lubricating oil circulation principle diagram of a multi-connected lubricating oil pump fire protection test in the prior art;

[0025] Figure 3 It is a partial structural schematic diagram of a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a simulated housing in a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention from a first perspective;

[0027] Figure 5 is a structural schematic diagram of a simulated housing in a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention from a second perspective;

[0028] Figure 6 It is a structural schematic diagram of a simulated shell from a third perspective in a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention;

[0029] Figure 7 yes Figure 6 The AA section diagram of the simulated casing in the multi-connected lubricating oil pump fire protection test device is shown;

[0030] Figure 8 yes Figure 6 The BB section diagram of the simulated casing in the multi-connected lubricating oil pump fire protection test device is shown;

[0031] Fig. 9 It is a structural schematic diagram of a booster pump in a multiple lubricating oil pump fire protection test device in a preferred embodiment of the present invention;

[0032] Fig.10 It is a schematic diagram of the lubricating oil flow of a multiple lubricating oil pump in a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of the lubricating oil circulation principle of a multiple lubricating oil pump fire protection test device according to a preferred embodiment of the present invention.

[0034] Legend:

[0035] 100, simulated shell; 110, oil collecting chamber; 120, throttle nozzle; 130, oil port; 140, pipe joint one; 150, pipe joint two; 160, pipe joint three; 170, pipe joint four; 200, multi-unit lubricating oil pump; 210, boost pump; 211, boost stage oil trough; 220, return oil pump; 310, boost stage oil tank; 320, pump station one; 330, regulating valve one; 340, flow meter one; 350, platinum resistor one; 360, pressure gauge one; 370, regulating valve two; 380, vent valve one; 410, return oil stage oil tank; 420, pump station two; 430, regulating valve three; 440, flow meter two; 450 platinum resistor two; 460, pressure gauge two; 470, regulating valve four; 480, vent valve two. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0037] like Figure 3-Figure 11 As shown, the multi-connected lubricating oil pump fire prevention test device of this embodiment includes a simulated housing 100 used to simulate an engine casing and connected to a test bench, a multi-connected lubricating oil pump 200 arranged on the simulated housing 100, a booster stage circulating oil circuit connected to the simulated housing 100, and an oil return stage circulating oil circuit connected to the simulated housing 100. The multi-connected lubricating oil pump 200 includes a booster pump 210 and a multi-stage oil return pump 220. The oil discharge port of the booster pump 210 is connected to the oil supply end of the booster stage circulating oil circuit, and the oil suction port of the booster pump 210 is connected to the oil return end of the booster stage circulating oil circuit. A boosting stage oil through groove 211 connected with the oil suction port and the oil discharge port respectively is provided in the boosting pump 210, an oil collecting chamber 110 connected with the oil suction port of the multi-stage return oil pump 220 and the return oil end of the return oil stage circulating oil circuit respectively is provided in the simulation shell 100, the oil supply end of the return oil stage circulating oil circuit is respectively connected with the oil discharge port of the multi-stage return oil pump 220, an oil return stage oil through groove connected with the oil suction port and the oil discharge port respectively is provided in the return oil pump 220, and a throttle nozzle 120 is arranged on the oil circuit connected with the oil suction port of the return oil pump 220 in the simulation shell 100 and the oil collecting chamber 110.

[0038] like Figure 3-Figure 11As shown, specifically, the multi-connected lubricating oil pump fire prevention test device of the present invention simulates the engine casing through the simulated housing 100 and connects it to the test bench, and then installs the multi-connected lubricating oil pump 200, the boost stage circulating oil circuit and the return oil stage circulating oil circuit on the simulated housing 100, so that the fire prevention test can be carried out under the condition that the test bench does not need a power source; the oil discharge port of the boosting pump 210 is connected with the oil supply end of the boosting stage circulating oil circuit, and the oil suction port of the boosting pump 210 is connected with the return oil end of the boosting stage circulating oil circuit, so that the lubricating oil first flows into the oil discharge port of the boosting pump 210 and then flows out from the oil suction port of the boosting pump 210, and the temperature and pressure parameters of the oil discharge port of the boosting pump 210 are guaranteed by the reverse flow of the lubricating oil, and the boosting pump 210 is connected to the oil supply end of the boosting stage circulating oil circuit. A boosting stage oil groove 211 connected to the oil suction port and the oil discharge port is provided in the boosting pump 210, so that during the fire prevention test, the boosting stage lubricating oil can circulate when the boosting pump 210 is not rotating, thereby verifying the fire prevention performance of the boosting pump 210 when the boosting pump 210 is not rotating; an oil collecting chamber 110 connected to the oil suction port of the multi-stage return oil pump 220 and the return oil end of the return oil stage circulating oil circuit is provided in the simulation shell 100, and then the oil supply end of the return oil stage circulating oil circuit is connected to the oil discharge port of the multi-stage return oil pump 220, so that the lubricating oil first flows into the oil discharge port of the multi-stage return oil pump 220, and then merges into the oil collecting chamber 110 from the oil suction port of the multi-stage return oil pump 220. The oil in the oil return pump 220 flows out of the cavity 110, and the temperature and pressure parameters of the oil discharge port of the return oil pump 220 are guaranteed by the reverse flow of the lubricating oil. A throttle nozzle 120 is arranged in the oil circuit connected with the oil suction port of the return oil pump 220 and the oil collecting cavity 110 in the simulation housing 100, so that the lubricating oil flow distribution in the multi-stage return oil pump 220 can be achieved through the cooperation of the throttle nozzle 120 and the oil collecting cavity 110, thereby ensuring that the flow in each return oil pump 220 meets the test requirements, and at the same time greatly simplifies the piping system and reduces the risk of lubricating oil leakage. In addition, the return oil pump 220 is provided with a return oil stage oil groove connected with the oil suction port and the oil discharge port respectively, so that the circulation flow of the return oil stage lubricating oil can be realized when the return oil pump 220 is not rotating. movement, thereby realizing verification of the fireproof performance of the return oil pump 220 when the return oil pump 220 is not rotating; compared with the prior art, this solution realizes simulation of the lubricating oil circulation of the multi-stage lubricating oil pump 200 when it is working by opening a boosting stage oil groove 211 and an oil return stage oil groove in the boosting pump 210 and the oil return pump 220 respectively, and under the action of the boosting stage circulating oil circuit and the oil return stage circulating oil circuit, when the multi-stage lubricating oil pump 200 is not rotating, and the reverse flow of the lubricating oil is used to facilitate ensuring that the temperature and pressure parameters during the fireproof test meet the requirements, and at the same time, the throttle nozzle 120 and the oil collecting chamber 110 are cooperated to realize the lubricating oil flow distribution in the multi-stage return oil pump 220 to ensure that the flow parameters meet the requirements.Compared with the existing technology, the requirements for the test bench are low (the test bench does not need to be equipped with a power source and related protective equipment), the piping system is simplified, and the risk of unsuccessful fire protection test of the multi-lubricating oil pump 200 due to high requirements for the test bench (the test bench needs to be equipped with a power source and related protective equipment) and complex piping system is greatly reduced. It is highly practical and suitable for wide promotion and application.

[0039] like Figure 6-Figure 8 As shown, in this embodiment, the return oil pump 220 is arranged in four stages, the throttle nozzles 120 and the return oil pumps 220 are arranged one by one, the flow rates of the fire test of the four throttle nozzles 120 are W1, W2, W3 and W4 respectively, and the corresponding diameters of the throttle nozzles 120 are ΦA, ΦB, ΦC, ΦD respectively, and the flow calculation formula of the throttle nozzle 120 is:

[0040] ;

[0041] ;

[0042] in, W For the throttle nozzle 120 flow, C d is the flow coefficient, d is the diameter of the throttle nozzle 120, is the pressure difference before and after the throttle nozzle 120, ρ is the density of the lubricating oil, and ΦA is Φ1.5mm~Φ2mm.

[0043] like Figure 6-Figure 8 As shown, specifically, the flow parameters of the four-stage return oil pump 220 are controlled respectively by four throttle nozzles 120. Therefore, the flow rate of the fire test of the throttle nozzle 120 is the flow rate to be achieved during the fire test of the return oil pump 220, that is, W1, W2, W3 and W4 are all known values. Since the pressure difference before and after each throttle nozzle 120 is basically the same, it can be known from the calculation formula of the flow rate of the throttle nozzle 120 that the flow rate of the throttle nozzle 120 is proportional to the square of the diameter of the throttle nozzle 120. After selecting a suitable value of ΦA from Φ1.5mm~Φ2mm, the values ​​of ΦB, ΦC, and ΦD can be obtained, so that the lubricating oil flow in each stage of the return oil pump 220 reaches the theoretical specified value.

[0044] It should be understood that the theoretical specified value is the theoretical calculated value during the oil flow test in each throttle nozzle 120, and there may be a deviation from the specified value of the oil flow during the actual test. Therefore, during the actual test, the throttle nozzle 120 needs to be sharpened and corrected.

[0045] It should be understood that before the test begins, the flow rate of the oil discharge port of each return oil pump 220 can be measured respectively. If the flow rate does not meet the requirement, the corresponding throttle nozzle 120 is ground to adjust the flow rate. After the flow rate of the oil discharge port of each return oil pump 220 reaches the specified value, each throttle nozzle 120 is glued and cured.

[0046] It should be understood that, since the return oil pump 220 does not rotate in the present embodiment, the return oil pump 220 itself cannot adjust the lubricating oil flow. If each return oil pump 220 is connected to a separate external pipeline to supply the lubricating oil flow to ensure that the lubricating oil flow reaches the specified value, it will result in a large number of external pipelines, a complex pipeline system, more pipeline joints on the transition section, more sealing parts, a higher risk of lubricating oil leakage, and a higher risk of test failure.

[0047] like Figure 4-Figure 6 As shown, in this embodiment, the simulation housing 100 includes a mounting surface 1 connected to the multi-connected lubricating oil pump 200 and a mounting surface 2 arranged opposite to the mounting surface 1, four oil passages 130 are opened on the mounting surface, and the throttle nozzle 120 is arranged on the oil passage 130. A pipe joint 140, a pipe joint 2 150, a pipe joint 3 160 and a pipe joint 4 170 are arranged on the mounting surface 2. The pipe joint 140 is respectively connected to the oil discharge port of the boost pump 210 and the oil supply end of the boost stage circulating oil circuit, the pipe joint 2 150 is respectively connected to the oil suction port of the boost pump 210 and the oil return end of the boost stage circulating oil circuit, the pipe joint 3 160 is respectively connected to the oil return end of the return oil stage circulating oil circuit and the oil collecting chamber 110, and the pipe joint 4 170 is respectively connected to the oil supply end of the return oil stage circulating oil circuit and the oil discharge port of the multi-stage return oil pump 220.

[0048] Optionally, in another embodiment, the oil return pump 220 is arranged in five stages, and the throttle nozzle 120, the oil port 130 and the oil return pump 220 are arranged in a one-to-one correspondence.

[0049] It should be understood that the number of stages of the oil return pump 220 depends on the multi-connected lubricating oil pump to be tested, and the throttle nozzle 120, the oil port 130 and the oil return pump 220 are arranged in a one-to-one correspondence.

[0050] like Figure 4-Figure 6 As shown, specifically, the simulation housing 100 is provided with four oil passages 130 and pipe joint 1 140, pipe joint 2 150, pipe joint 3 160 and pipe joint 4 170 respectively through two relatively arranged mounting surfaces, the multi-connected lubricating oil pump 200 is installed with the four oil passages 130 in conjunction with the mounting surface 1, the boost stage circulating oil circuit is connected through the pipe joint 1 140 and the pipe joint 2 150, and the return stage circulating oil circuit is connected through the pipe joint 3 160 and the pipe joint 4 170, so that the oil circuit in the simulation housing 100 is arranged in a straight line, thereby reducing the flow resistance and ensuring smooth exhaust.

[0051] like Figure 5As shown, optionally, pipe joint 1 140, pipe joint 2 150, pipe joint 3 160 and pipe joint 4 170 are welded on mounting surface 2 to avoid the risk of failure of the sealing structure. Optionally, the throttle nozzle 120 is a screw plug type, which is easy to disassemble and adjust. Optionally, the material selection of the simulation housing 100 is consistent with the engine casing, and the length, width and height of the simulation housing 100 are kept consistent with the engine casing as much as possible to truly simulate the engine casing and improve the credibility of the test results.

[0052] like Fig.11 As shown, in this embodiment, the boosting stage circulating oil circuit includes a boosting stage oil tank 310, a boosting stage oil supply assembly connected to the oil outlet of the boosting stage oil tank 310 and the oil discharge port of the boosting pump 210, and a boosting stage oil return assembly connected to the oil return port of the boosting stage oil tank 310 and the oil suction port of the boosting pump 210. Specifically, the boosting stage oil tank 310 stores lubricating oil, and the lubricating oil in the boosting stage oil tank 310 is transported to the boosting pump 210 through the boosting stage oil supply assembly, and then the lubricating oil in the boosting pump 210 is returned to the boosting stage oil tank 310 through the boosting stage oil return assembly, thereby realizing the circulation of the boosting stage lubricating oil.

[0053] like Fig.11 As shown, in this embodiment, the boost stage oil supply assembly includes a pump station 320 connected to the oil outlet of the boost stage oil tank 310, an oil supply pipe 1 connected to the oil outlet of the boost pump 210 and the pump station 320 respectively, a regulating valve 330 connected to the oil supply pipe 1 and the boost stage oil tank 310 respectively, a flow meter 340 arranged on the oil supply pipe 1, a platinum resistor 350 arranged on the oil supply pipe 1 and a pressure gauge 360 ​​arranged on the oil supply pipe 1. Specifically, the pump station 1 320 works to deliver the lubricating oil in the boosting stage oil tank 310 to the oil supply pipe 1, and then delivers the lubricating oil to the boosting pump 210 through the oil supply pipe 1, and adjusts the lubricating oil flow rate through the regulating valve 1 330, and measures the lubricating oil flow parameters through the flow meter 1 340 to ensure that the lubricating oil flow rate reaches the specified value, and measures the lubricating oil temperature and lubricating oil pressure in real time through the platinum resistance 1 350 and the pressure gauge 1 360 respectively to ensure that the lubricating oil temperature and lubricating oil pressure reach the specified value. Optionally, a heating element 1 for heating the lubricating oil temperature to a specified value is arranged in the pump station 1 320.

[0054] like Fig.11As shown, in this embodiment, the boosting stage oil return assembly includes an oil return pipe 1 connected to the oil suction port of the boosting pump 210 and the oil return port of the boosting stage oil tank 310, a regulating valve 2 370 arranged on the oil return pipe 1, and a vent valve 1 380 arranged on the oil return pipe 1. Specifically, the boosting stage lubricating oil is returned to the boosting stage oil tank 310 through the oil return pipe 1, and the lubricating oil pressure is adjusted by the regulating valve 2 370 in cooperation with the boosting stage oil supply assembly, and in the last 10 minutes of the fire test, the oil and gas in the oil circuit are discharged through the vent valve 1 380 to balance the pressure in the oil circuit, so as to prevent the seal at the pipe joint from failing due to excessive pressure in the oil circuit.

[0055] It should be understood that when selecting the test parameters for the fire prevention test, for the 15-minute fire prevention test, in the first 5 minutes: the boost stage lubricating oil flow rate is taken as the minimum lubricating oil circulation volume under the engine's minimum ground slow state, the boost stage lubricating oil pressure is taken as the maximum value of the normal working pressure of the boost stage outlet, the boost stage lubricating oil temperature is based on the limit value, and the maximum temperature drop between the boost stage outlet and the system temperature measuring point is considered; in the next 10 minutes: the lubricating oil flow rate is taken as the value at the engine's minimum windmill speed, and the lubricating oil pressure and temperature are not required.

[0056] like Fig.11 As shown, in this embodiment, the oil return stage circulation oil circuit includes an oil return stage oil tank 410, an oil return stage oil return assembly respectively connected to the oil return port of the oil return stage oil tank 410 and the oil collecting chamber 110, and an oil return stage oil supply assembly respectively connected to the oil outlet of the oil return stage oil tank 410 and the oil discharge port of the multi-stage oil return pump 220. Specifically, the lubricating oil is stored in the oil return stage oil tank 410, and then the lubricating oil in the oil return stage oil tank 410 is transported to the multi-stage oil return pump 220 through the oil return stage oil supply assembly. After the lubricating oil in the multi-stage oil return pump 220 is merged into the oil collecting chamber 110, the lubricating oil in the oil collecting chamber 110 is returned to the oil return stage oil tank 410 through the oil return stage oil return assembly, thereby realizing the circulation of the oil return stage lubricating oil.

[0057] like Fig.11As shown, in this embodiment, the return oil stage oil supply assembly includes a pump station 2 420 connected to the oil outlet of the return oil stage tank 410, an oil supply pipe 2 connected to the pump station 2 420 and the oil discharge port of the multi-stage return oil pump 220 respectively, a regulating valve 3 430 connected to the oil supply pipe 2 and the return oil stage tank 410 respectively, a flow meter 2 440 arranged on the oil supply pipe 2, a platinum resistor 2 450 arranged on the oil supply pipe 2, and a pressure gauge 2 460 arranged on the oil supply pipe 2. Specifically, the pump station 2 420 works to deliver the lubricating oil in the return oil tank 410 to the oil supply pipe 2, and then delivers the lubricating oil to each return oil pump 220 through the oil supply pipe 2, and adjusts the lubricating oil flow through the regulating valve 3 430, and measures the lubricating oil flow parameters through the flow meter 2 440 to ensure that the lubricating oil flow reaches the specified value, and measures the lubricating oil temperature and lubricating oil pressure in real time through the platinum resistance 2 450 and the pressure gauge 2 460 respectively to ensure that the lubricating oil temperature and lubricating oil pressure reach the specified value. Optionally, a heating element 2 for heating the lubricating oil temperature to the specified value is arranged in the pump station 2 420.

[0058] like Fig.11 As shown, in this embodiment, the oil return stage oil return assembly includes an oil return pipe 2 which is respectively connected to the oil return port of the oil return stage tank 410 and the oil collecting chamber 110, a regulating valve 470 arranged on the oil return pipe 2, and a vent valve 280 arranged on the oil return pipe 2. Specifically, the oil return stage lubricating oil is returned to the oil return stage tank 410 through the oil return pipe 2, and the lubricating oil pressure is adjusted by the regulating valve 470 in cooperation with the oil return stage oil supply assembly, and in the last 10 minutes of the fire test, the oil and gas in the oil circuit are discharged through the vent valve 280 to balance the pressure in the oil circuit, so as to prevent the seal at the pipe joint from failing due to excessive pressure in the oil circuit.

[0059] It should be understood that when selecting the test parameters for the fire protection test, for the 15-minute fire protection test, in the first 5 minutes, the total return oil stage flow rate is consistent with the boost stage flow rate, and the lubricating oil flow rate of each return oil stage is the oil supply to the corresponding bearing cavity under the minimum circulation volume of the system; the return oil stage pressure is the maximum value of the total return oil outlet pressure; the return oil stage lubricating oil temperature is the highest value of the oil temperature at the discharge port of each stage of the return oil pump; in the next 10 minutes: the lubricating oil flow rate is the value at the minimum windmill speed of the engine, and the lubricating oil pressure and temperature are not required.

[0060] The fire prevention test method for the multiple lubricating oil pump of this embodiment adopts the fire prevention test device for the multiple lubricating oil pump. Specifically, by adopting the fire prevention test device for the multiple lubricating oil pump in the fire prevention test method for the multiple lubricating oil pump, the requirements for the test bench are reduced, and the piping system is simplified, which greatly reduces the risk of failure of the fire prevention test of the multiple lubricating oil pump 200 due to factors such as high requirements for the test bench and complex piping system, and has strong practicality and is suitable for wide promotion and application.

[0061] The process of the fire test method is as follows:

[0062] After the multi-unit lubricating oil pump fire protection test device is assembled, the lubricating oil is allowed to circulate in the two circulating oil circuits for at least 10 minutes before the test. The lubricating oil temperature reaches the specified value through the heating component 1 in the pump station 320 and the platinum resistor 1 350, the speed of the pump station 320 is adjusted, and the regulating valve 1 330 and the regulating valve 2 370 are jointly controlled to make the lubricating oil flow and lubricating oil pressure reach the specified values; the lubricating oil temperature reaches the specified value through the heating component 2 in the pump station 2 420 and the platinum resistor 2 450, the speed of the pump station 2 420 is adjusted, and the regulating valve 3 430 and the regulating valve 4 470 are jointly controlled to make the total flow and pressure of the return oil grade lubricating oil reach the specified values. After the temperature is circulated for half an hour, the oil burner flame and heat flux density calibration is completed according to the method in the ISO2685 standard.

[0063] Place the oil burner in the test position and expose the multi-unit lubricating oil pump 200 to the flame of the oil burner. At this time, ensure that the parameter requirements of the supercharging stage lubricating oil and the total return oil stage lubricating oil are met. Stop the lubricating oil circulation after 5 minutes and continue to keep the multi-unit lubricating oil pump 200 exposed to the flame of the oil burner. Adjust the lubricating oil circulation volume according to the windmill state parameters (from the perspective of stricter assessment, the lubricating oil circulation can be stopped in the last 10 minutes, and the vent valve 1 is opened at 380 and the vent valve 2 is opened at 480 for testing); 10 minutes after stopping the circulation, the multi-unit lubricating oil pump 200 leaves the flame area, recalibrates and closes the oil burner, records the data, and stops the test. During the test, the flow, temperature, pressure data and other parameters of the supercharging stage lubricating oil and the total return oil stage lubricating oil are collected and recorded in real time.

[0064] When the test results meet the following requirements, the fire resistance performance of the multi-connected lubricating oil pump 200 meets the requirements:

[0065] a) There is no leakage of dangerous amounts of lubricating oil;

[0066] b) The material composition of the multiple oil pump 200 cannot contribute to the spread of flames or oil leakage;

[0067] c) No residual fire; Note: After the burner is removed, the flame on the test piece should automatically extinguish and will not ignite again;

[0068] d) No other hazardous conditions occur.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-connection lubricating oil pump fire protection test device, characterized in that: The invention comprises a simulation housing (100) for simulating an engine casing and connected to a test bench, a multi-connected lubricating oil pump (200) arranged on the simulation housing (100), a boosting stage circulating oil circuit connected to the simulation housing (100), and an oil return stage circulating oil circuit connected to the simulation housing (100); the multi-connected lubricating oil pump (200) comprises a boosting pump (210) and a multi-stage oil return pump (220); an oil discharge port of the boosting pump (210) is connected to an oil supply end of the boosting stage circulating oil circuit; an oil suction port of the boosting pump (210) is connected to an oil return end of the boosting stage circulating oil circuit; and a boosting pump (210) is provided inside the boosting pump (210). A booster stage oil groove (211) is provided which is connected to the oil suction port and the oil discharge port respectively; an oil collecting chamber (110) is provided in the simulation housing (100) which is connected to the oil suction port of the multi-stage oil return pump (220) and the oil return end of the oil return stage circulating oil circuit respectively; the oil supply end of the oil return stage circulating oil circuit is connected to the oil discharge port of the multi-stage oil return pump (220) respectively; an oil return stage oil groove is provided in the oil return pump (220) which is connected to the oil suction port and the oil discharge port respectively; and a throttle nozzle (120) is arranged on the oil circuit which is connected to the oil suction port of the oil return pump (220) in the simulation housing (100) and the oil collecting chamber (110).

2. The multiple lubricating oil pump fire protection test device according to claim 1, characterized in that: The oil return pump (220) is arranged in four stages, and the throttle nozzles (120) and the oil return pumps (220) are arranged one by one. The flow rates of the four throttle nozzles (120) during the fire protection test of the multi-connected lubricating oil pump are W1, W2, W3 and W4 respectively, and the diameters of the corresponding throttle nozzles (120) are ΦA, ΦB, ΦC and ΦD respectively. The flow rate calculation formula of the throttle nozzles (120) is: ； ； in, W is the flow rate of the throttle nozzle (120), C d is the flow coefficient, d is the diameter of the throttle nozzle (120), is the pressure difference before and after the throttle nozzle (120), ρ is the density of lubricating oil, ΦA is Φ1.5mm~Φ2mm.

3. The multiple lubricating oil pump fire protection test device according to claim 2, characterized in that: The simulation housing (100) comprises a mounting surface 1 connected to a multi-connected lubricating oil pump (200) and a mounting surface 2 arranged opposite to the mounting surface 1. Four oil passages (130) are provided on the mounting surface. A throttle nozzle (120) is arranged on the oil return port. A pipe joint 1 (140), a pipe joint 2 (150), a pipe joint 3 (160) and a pipe joint 4 (170) are arranged on the mounting surface 2. The pipe joint 1 (140) is respectively connected to the oil discharge port of the boosting pump (210) and the oil supply end of the boosting stage circulating oil circuit. The pipe joint 2 (150) is respectively connected to the oil suction port of the boosting pump (210) and the oil return end of the boosting stage circulating oil circuit. The pipe joint 3 (160) is respectively connected to the oil return end of the oil return stage circulating oil circuit and the oil collecting chamber (110). The pipe joint 4 (170) is respectively connected to the oil supply end of the oil return stage circulating oil circuit and the oil discharge port of the multi-stage return oil pump (220).

4. The multiple lubricating oil pump fire protection test device according to any one of claims 1 to 3, characterized in that: The boost stage circulating oil circuit comprises a boost stage oil tank (310), a boost stage oil supply assembly respectively connected to an oil outlet of the boost stage oil tank (310) and an oil discharge port of a boost pump (210), and a boost stage oil return assembly respectively connected to an oil return port of the boost stage oil tank (310) and an oil suction port of the boost pump (210).

5. The multiple lubricating oil pump fire protection test device according to claim 4, characterized in that: The boost stage oil supply assembly comprises a pump station (320) connected to the oil outlet of the boost stage oil tank (310), an oil supply pipe (320) connected to the oil outlet of the boost pump (210) and the pump station (320) respectively, a regulating valve (330) connected to the oil supply pipe (330) and the boost stage oil tank (310) respectively, a flow meter (340) arranged on the oil supply pipe (340), a platinum resistor (350) arranged on the oil supply pipe (350), and a pressure gauge (360) arranged on the oil supply pipe (360).

6. The multiple lubricating oil pump fire protection test device according to claim 4, characterized in that: The boost stage oil return assembly comprises an oil return pipe 1 which is respectively connected to the oil suction port of the boost pump (210) and the oil return port of the boost stage oil tank (310), a regulating valve 2 (370) arranged on the oil return pipe 1, and a vent valve 1 (380) arranged on the oil return pipe 1.

7. The multiple lubricating oil pump fire protection test device according to any one of claims 1 to 3, characterized in that: The oil return stage circulation oil circuit comprises an oil return stage oil tank (410), an oil return stage oil return assembly respectively connected to the oil return port of the oil return stage oil tank (410) and the oil collecting chamber (110), and an oil return stage oil supply assembly respectively connected to the oil outlet of the oil return stage oil tank (410) and the oil discharge port of the multi-stage oil return pump (220).

8. The multiple lubricating oil pump fire protection test device according to claim 7, characterized in that: The oil return stage oil supply assembly comprises a second pump station (420) connected to the oil outlet of the oil return stage tank (410), a second oil supply pipe connected to the second pump station (420) and the oil discharge port of the multi-stage oil return pump (220), a third regulating valve (430) connected to the second oil supply pipe and the oil return stage tank (410), a second flow meter (440) arranged on the second oil supply pipe, a second platinum resistor (450) arranged on the second oil supply pipe, and a second pressure gauge (460) arranged on the second oil supply pipe.

9. The multiple lubricating oil pump fire protection test device according to claim 7, characterized in that: The oil return stage oil return assembly comprises an oil return pipe 2 which is respectively connected to the oil return port of the oil return stage tank (410) and the oil collecting chamber (110), a regulating valve 4 (470) arranged on the oil return pipe 2, and a vent valve 2 (480) arranged on the oil return pipe 2.

10. A fire protection test method for a multiple lubricating oil pump, characterized in that: A multiple lubricating oil pump fire protection test device as described in any one of claims 1 to 9 is adopted.

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