Variable-pressure-ratio oil injector and variable-pressure-ratio oil injector assembly

Abstract

The invention relates to a variable-pressure-ratio oil injector and a variable-pressure-ratio oil injector assembly, the variable-pressure-ratio oil injector comprises a base, the base is connected with a nozzle and a filter shell, the filter shell and the base define an oil suction cavity, the filter shell is provided with an oil inlet hole communicated with the oil suction cavity and the outside, the output end of the nozzle is located in the oil suction cavity, and the input end of the nozzle is located outside the oil suction cavity; the throat pipe and the diffusion pipe are arranged outside the oil absorption cavity, the throat pipe is connected with the filter shell and is coaxial with the nozzle, one end of the throat pipe is communicated with the oil absorption cavity, the other end of the throat pipe is coaxially connected with the diffusion pipe, and the throat pipe and the filter shell are relatively fixed in the axial direction; the filter shell can move relative to the base in the axial direction of the nozzle. The function of adjusting the distance between the throat and the nozzle can be achieved, and then the pressure ratio can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of oil injectors, and in particular to a variable pressure ratio oil injector and a variable pressure ratio oil injector assembly. Background Art

[0002] An oil ejector is a device that uses fluid jets to transfer energy and mass. It achieves fluid delivery or pressure increase through the suction effect of high-speed jets. Because it has no mechanical moving parts, simple structure and high reliability, it is widely used in industry, energy and other fields.

[0003] The pressure ratio of the injector refers to the pressure ratio of the fluid at the nozzle inlet and the mixed fluid at the output. The pressure ratio needs to be adjusted according to the working conditions to adapt to different load conditions of the equipment.

[0004] Based on the test and fluid mechanics analysis, it is found that the throat-mouth distance ( Figure 2 Lc) is an independent pressure ratio adjustment parameter. By changing Lc, the pressure ratio can be adjusted. Based on this principle, the present application aims to provide an injector with an adjustable nozzle-throat distance. Summary of the Invention

[0005] Based on the above description, the present invention provides a variable pressure ratio injector, which can adjust the pressure ratio by adjusting the nozzle-throat distance of the injector.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present application provides a variable pressure ratio injector, the technical solution adopted is as follows: A variable pressure ratio injector, comprising: A base, wherein the base is connected to a nozzle and a filter housing, the filter housing and the base enclose an oil suction chamber, the filter housing is provided with an oil inlet hole connecting the oil suction chamber and the outside, the nozzle output end is located in the oil suction chamber and the nozzle input end is located outside the oil suction chamber; A throat pipe and a diffuser pipe are provided outside the oil suction chamber, the throat pipe is connected to the filter housing and is coaxial with the nozzle, one end of the throat pipe is connected to the oil suction chamber, and the other end is coaxially connected to the diffuser pipe, and the throat pipe is fixed relative to the filter housing in the axial direction; The filter housing is movable relative to the base along the axial direction of the nozzle.

[0007] Preferably, the filter housing includes a filter cartridge and an end plate. The filter cartridge is cylindrically arranged around the nozzle. Both ends of the filter cartridge are respectively connected to the end plate and the base. The oil inlet is provided on the filter cartridge, and the throat is connected to the end plate.

[0008] Preferably, the filter cartridge is provided with an adjusting member, and the adjusting member is used to adjust the flow area of ​​oil from outside the oil suction cavity into the oil suction cavity.

[0009] Preferably, when the filter housing moves relative to the base along the axial direction of the nozzle, the flow area of ​​the oil entering the oil suction cavity from outside the oil suction cavity is adjusted by the adjusting member.

[0010] Preferably, the filter cartridge is cylindrical and its axis is parallel to the throat pipe, and a plurality of oil inlet holes are provided and evenly distributed on the side wall of the filter cartridge; The adjusting member includes an adjusting cylinder, which is coaxially sleeved outside the filter cylinder. The adjusting cylinder and the filter cylinder are clearance-matched. A plurality of adjusting holes are provided on the side wall of the adjusting cylinder. The plurality of adjusting holes are connected to the plurality of oil inlet holes in a one-to-one correspondence. The adjusting cylinder can rotate relative to the filter cylinder and change the connection area between the adjusting holes and the corresponding oil inlet holes during rotation.

[0011] Preferably, the adjustment cylinder is restricted from moving axially relative to the filter cylinder, a guide groove is provided on the outer wall of the adjustment cylinder, the guide groove extends spirally around the axis of the adjustment cylinder, and a guide block embedded in the guide groove is connected to the base, and the guide block can move relative to the adjustment cylinder along the length direction of the guide groove.

[0012] In a second aspect, the present application provides a variable pressure ratio injector assembly, comprising the variable pressure ratio injector as described above, wherein the base is used to be fixed to the oil tank, and the throat, the diffuser and the filter housing are movable relative to the oil tank.

[0013] Preferably, the end of the diffuser away from the throat pipe is connected to a coaxial mounting flange, and both end surfaces of the mounting flange are provided with a first gasket and a second gasket respectively; In which, the end of the diffuser away from the throat is used to pass through the outside of the oil tank, and the first gasket is arranged between the mounting flange and the oil tank, and the second gasket is arranged between the mounting flange and the end face flange of the oil pipe, so as to limit the axial movement of the diffuser by the first gasket and the second gasket, and is suitable for adjusting the position of the diffuser relative to the oil tank in its own axial direction by replacing the first gasket and the second gasket of different thicknesses.

[0014] Preferably, it also includes an adjustment component, which includes a hydraulic actuator and a controller. The hydraulic actuator is used to be connected to the oil tank and connected to the diffuser. The hydraulic actuator is used to drive the diffuser to move axially relative to the oil tank. The controller is used to control the operation of the hydraulic actuator.

[0015] Preferably, the diffuser pipe is connected to a corrugated expansion pipe at one end away from the throat pipe, and the diffuser pipe is adapted to be communicated with the oil tank outlet through the corrugated expansion pipe.

[0016] Compared with the prior art, the technical solution of this application has at least the following beneficial technical effects: 1. The main structure of the oil injector of the present application is formed by a base, a nozzle, a filter housing, a throat pipe, and a diffuser. The throat pipe and diffuser are connected to the filter housing and are relatively fixed in the axial direction. The filter housing is configured to be movable relative to the base along the axial direction of the nozzle. When the filter housing moves, the throat pipe and diffuser move axially with the filter housing, that is, the throat pipe moves axially relative to the nozzle, thereby changing the distance between the nozzle and the throat, realizing the adjustable function of the nozzle-to-throat distance, and thus achieving an adjustable pressure ratio.

[0017] 2. The oil ejector of the present application arranges an oil inlet on a filter cartridge and provides an adjustment member to adjust the flow area of ​​oil entering the oil suction chamber from outside the suction chamber. By adjusting the flow area, the flow resistance of oil entering the suction chamber from outside is adjusted. When the pressure ratio is increased, the flow area adaptively decreases to increase the flow resistance, thereby reducing the flow of oil entering the suction chamber. This prevents a large flow rate from increasing the output flow rate and decreasing the output pressure, which would otherwise result in a low pressure ratio. Conversely, when the pressure ratio is decreased, the flow area adaptively increases to reduce the flow resistance, thereby increasing the flow of oil entering the suction chamber. This prevents a small flow rate from decreasing the output flow rate and increasing the output pressure, which would otherwise result in a high pressure ratio. This ensures that the pressure ratio can be precisely adjusted to the set value.

[0018] 3. The variable pressure ratio injector assembly of the present application can adjust the throat-to-nozzle distance by moving the throat, diffuser, and filter housing relative to the oil tank, thereby achieving adjustment of the pressure ratio.

[0019] 4. The variable pressure ratio injector assembly of the present application secures the diffuser to the fuel tank and fuel pipeline by providing a mounting flange on the diffuser and disposing a first gasket and a second gasket between the mounting flange and the fuel tank and fuel pipeline, respectively. When the nozzle-throat distance needs to be adjusted to adjust the pressure ratio, the diffuser, fuel tank, and fuel pipeline can be secured by replacing the first and second gaskets of different thicknesses. Simultaneously, the diffuser's axial position relative to the fuel tank is adjusted, and the nozzle-throat distance is then adjusted to adjust the pressure ratio. This simple adjustment allows for quick completion, improving maintenance and commissioning efficiency.

[0020] 5. The variable pressure ratio injector assembly of the present application adjusts the nozzle-throat distance by controlling the axial movement of the diffuser through the cooperation of a hydraulic actuator and a controller. The controller can receive instructions sent by the control system and control the operation of the hydraulic actuator to adjust the nozzle-throat distance, thereby avoiding various disassembly work and realizing the automation of the injector parameter adjustment work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Figure 1 is the background technology of the present invention; Figure 2 A schematic structural diagram of a variable pressure ratio injector provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a variable pressure ratio injector provided by an embodiment of the present invention when provided with an adjusting member; Figure 4 A schematic diagram of the coordination of the regulating cylinder, the filter cylinder, and the transmission structure in the variable pressure ratio injector provided in an embodiment of the present invention; Figure 5 A schematic structural diagram of a first embodiment of a regulating assembly in a variable pressure ratio injector assembly provided by an embodiment of the present invention; Figure 6 This is a schematic structural diagram of a second embodiment of the regulating assembly in a variable pressure ratio injector assembly provided in an embodiment of the present invention.

[0022] Description of reference numerals: 1. Base; 101. Bottom plate; 1011. Guide groove; 102. Mounting cylinder; 2. Filter housing; 201. Oil suction chamber; 202. Filter cartridge; 2021. Oil inlet hole; 203. End plate; 2031. Mounting groove; 3. Nozzle; 4. Throat; 401. Transition pipe; 5. Diffuser; 501. Mounting flange; 6. Oil inlet pipe; 7. Adjusting cylinder; 701. Adjusting hole; 702. Guide groove; 8. Limiting ring; 9. Guide block; 10. Connecting rod; 11. First gasket; 12. Second gasket; 13. Hydraulic actuator; 14. Controller; 15. Bellows expansion tube. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0025] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0026] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0027] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0028] Reference Figure 2 As shown, an embodiment of the present application provides a variable pressure ratio oil injector, which includes a base 1, a filter housing 2, a nozzle 3, a throat pipe 4, and a diffuser 5. The nozzle 3 and the filter housing 2 are connected to the base 1. The filter housing 2 and the base 1 enclose an oil suction chamber 201. The filter housing 2 is provided with an oil inlet hole 2021 connecting the oil suction chamber 201 with the outside. The output end of the nozzle 3 is located within the oil suction chamber 201, and the input end is located outside the oil suction chamber 201. The throat pipe 4 and the diffuser 5 are located outside the oil suction chamber 201. The throat pipe 4 is connected to the filter housing 2 and is coaxial with the nozzle 3. One end of the throat pipe 4 is connected to the oil suction chamber 201, and the other end is coaxially connected to the diffuser 5. The throat pipe 4 is fixed relative to the filter housing 2 in the axial direction.

[0029] Reference Figure 2As shown, the base 1 includes a bottom plate 101 and a mounting tube 102. A through mounting hole is provided on the bottom plate 101. The mounting tube 102 is arranged on one side of the bottom plate 101 and is coaxially arranged around the mounting hole. One end of the mounting tube 102 is integrally formed with the bottom plate 101, and a limiting hole is provided on the other end face for the nozzle 3 to partially pass through. The nozzle 3 passes through the mounting hole from the side of the bottom plate 101 away from the mounting tube 102 and penetrates into the mounting tube 102. After the nozzle 3 partially passes through the limiting hole, it is restricted from continuing to penetrate deeper. When connecting the oil inlet pipe 6, a flange is provided at the end of the oil inlet pipe 6, and corresponding bolt holes are provided on the side of the bottom plate 101 away from the mounting tube 102. The flange of the oil inlet pipe 6 is fixed to the bottom plate 101 by bolts. At this time, the oil inlet pipe 6 is connected to the input end of the nozzle 3, and the flange restricts the nozzle 3 from being separated from the bottom plate 101 and forms a seal with the nozzle 3.

[0030] Reference Figure 2 As shown, the filter housing 2 includes a filter cartridge 202 and an end plate 203. The filter cartridge 202 is cylindrical and arranged around the nozzle 3. The two ends of the filter cartridge 202 are respectively connected to the end plate 203 and the base 1. The oil inlet 2021 is provided on the filter cartridge 202, and the throat 4 is connected to the end plate 203.

[0031] Reference Figure 2 As shown, specifically, the filter cartridge 202 is arranged around the mounting cylinder 102 and connected to the base plate 101 at one end. An annular guide groove 1011 is provided on the side of the base plate 101 near the filter cartridge 202, surrounding the nozzle 3. One end of the filter cartridge 202 is embedded in the guide groove 1011. The filter cartridge 202 is restricted from moving radially relative to the base plate 101 along the nozzle 3, but can move axially relative to the base plate 101 along the nozzle 3. During the design, a labyrinth seal is used to achieve a dynamic seal between the filter cartridge 202 and the base plate 101 to prevent oil from entering the oil suction chamber 201 through the gap between the filter cartridge 202 and the base plate 101.

[0032] Reference Figure 2 As shown, an annular mounting groove 2031 is provided on one side of the end plate 203 close to the filter cartridge 202 , and the end of the filter cartridge 202 away from the bottom plate 101 is embedded in the mounting groove 2031 and the filter cartridge 202 and the end plate 203 are fixed by bolts.

[0033] Reference Figure 2 As shown, the end plate 203 is provided with an oil outlet connecting the oil suction chamber 201 with the outside. A coaxial transition pipe 401 is integrally formed at the end of the throat pipe 4 connected to the end plate 203. The transition pipe 401 passes through the oil outlet, and the end surface away from the throat pipe 4 is flush with the side of the end plate 203 near the oil suction chamber 201. A connecting flange is provided on the outside of the transition pipe 401. Bolt holes are provided on the side of the end plate 203 away from the filter cartridge 202, corresponding to the bolt holes. The flange is connected to the end plate 203 via bolts, thereby achieving a fixed connection between the throat pipe 4 and the end plate 203.

[0034] There are multiple oil inlet holes 2021 evenly distributed on the side wall of the filter cartridge 202 .

[0035] Reference Figure 3-4 As shown, further, in some embodiments, the filter cartridge 202 is provided with an adjusting member, and the adjusting member is used to adjust the flow area of ​​the oil from outside the oil suction chamber 201 into the oil suction chamber 201.

[0036] Reference Figure 3-4 As shown, specifically, the filter cartridge 202 is cylindrical and its axis is parallel to the throat 4. The adjusting part includes an adjusting cylinder 7, which is coaxially sleeved outside the filter cartridge 202. The adjusting cylinder 7 and the filter cartridge 202 are clearance-matched. A plurality of adjusting holes 701 are provided on the side wall of the adjusting cylinder 7. The plurality of adjusting holes 701 are connected to the plurality of oil inlet holes 2021 in a one-to-one correspondence. The adjusting cylinder 7 can rotate relative to the filter cartridge 202 and change the connection area between the adjusting hole 701 and the corresponding oil inlet hole 2021 during rotation.

[0037] Reference Figure 3 As shown, two coaxially arranged limiting rings 8 are provided outside the filter cartridge 202, spaced apart along the axial direction of the filter cartridge 202. The adjusting cylinder 7 is disposed between and in contact with the two limiting rings 8, thereby limiting the axial movement of the adjusting cylinder 7 relative to the filter cartridge 202 via the two limiting rings 8. The diameter of the oil inlet hole 2021 is set according to actual needs, and the diameter of the adjusting hole 701 is set to be the same as that of the oil inlet hole 2021. The adjusting cylinder 7 can be rotated until the adjusting hole 701 and the oil inlet hole 2021 overlap in the radial direction, thereby achieving maximum communication.

[0038] Furthermore, as the filter housing 2 moves relative to the base 1 along the axis of the nozzle 3, the adjustment member adjusts the flow area of ​​oil from outside the oil suction chamber 201 into the oil suction chamber 201. Specifically, when the pressure ratio needs to be reduced, the filter housing 2 is moved away from the base 1 to increase the nozzle-throat distance. The adjustment member increases the flow area of ​​oil from outside the oil suction chamber 201 into the oil suction chamber 201, and vice versa.

[0039] Through this setting, when the pressure ratio needs to be increased, the flow area is adaptively reduced to increase the flow resistance, thereby reducing the oil flow entering the oil suction chamber 201, avoiding the large flow causing an increase in output flow and a decrease in output pressure, which leads to a small pressure ratio; conversely, when the pressure ratio needs to be reduced, the flow area is adaptively increased to reduce the flow resistance, thereby increasing the oil flow entering the oil suction chamber 201, avoiding the small flow causing a decrease in output flow and an increase in output pressure, which leads to a large pressure ratio, thereby ensuring that the pressure ratio can be accurately adjusted to the set value.

[0040] Reference Figure 3-4As shown, the adjusting cylinder 7 and the base 1 are connected by a transmission structure, which includes a guide groove 702 arranged on the outer wall of the adjusting cylinder 7 and a guide block 9 connected to the base 1. The guide groove 702 extends spirally around the axis of the adjusting cylinder 7, and the guide block 9 is embedded in the guide groove 702. The guide block 9 can move relative to the adjusting cylinder 7 along the length direction of the guide groove 702.

[0041] Reference Figure 3-4 As shown, specifically, the guide block 9 is cylindrical and fixedly connected to the base 1 via a connecting rod 10. Due to the provision of the guide groove 702, when the filter cartridge 202 moves axially, the adjustment cartridge 7 and the guide block 9 move axially relative to each other. Under the guidance and limiting action of the guide groove 702, the guide block 9 drives the adjustment cartridge 7 to rotate relative to the filter cartridge 202, thereby adjusting the connection area between the adjustment hole 701 and the corresponding oil inlet hole 2021, thereby adjusting the total flow area. This arrangement eliminates the need for a separate drive to control the rotation of the adjustment cartridge 7. The flow area adaptively changes with the adjustment of the throat-to-mouth distance, ensuring precise adjustment of the pressure ratio.

[0042] This embodiment also provides a variable pressure ratio injector assembly, including the variable pressure ratio injector described above. Specifically, during installation, the variable pressure ratio injector is installed in a fuel tank, with the base 1 fixed to the fuel tank, while the throat 4, diffuser 5, and filter housing 2 are movable relative to the fuel tank.

[0043] The variable pressure ratio injector assembly also includes an adjustment assembly, refer to Figure 5 As shown, in the first embodiment, the end of the diffuser 5 away from the throat 4 is connected to a coaxial mounting flange 501 , and the adjustment assembly includes a first gasket 11 and a second gasket 12 , which are respectively located at the two end surfaces of the mounting flange 501 .

[0044] Reference Figure 5 As shown, during installation, the end of the diffuser 5 away from the throat pipe 4 extends outside the fuel tank. A first gasket 11 is positioned between the mounting flange 501 and the fuel tank, and a second gasket 12 is positioned between the mounting flange 501 and the end flange of the oil delivery pipe that outputs the oil. The first and second gaskets 11 and 12 restrict the axial movement of the diffuser 5 relative to the fuel tank. This arrangement ensures axial positioning of the diffuser 5 and connection to the fuel tank and the oil delivery pipe. In actual design, an interface flange located outside the fuel tank is provided at the fuel tank outlet, with the first gasket 11 positioned between the interface flange at the fuel tank outlet and the mounting flange 501.

[0045] During installation, the diffuser 5 is typically installed vertically and upwards through the fuel tank, eliminating the need for sealing between the diffuser 5 and the fuel pipe. However, sealing between the diffuser 5 and the fuel pipe is essential. Therefore, the second gasket 12 is a complete annular ring, ensuring both sealing and ease of replacement. The first gasket 11 is constructed from two semicircular sections, facilitating easy replacement.

[0046] Reference Figure 5 As shown, the position of the diffuser 5 relative to the fuel tank in its own axial direction can be adjusted by replacing the first gasket 11 and the second gasket 12 of different thicknesses. Specifically, when the nozzle-throat distance needs to be adjusted to adjust the pressure ratio, the first gasket 11 of different thicknesses is replaced. Specifically, when the nozzle-throat distance needs to be increased, the thicker first gasket 11 and the thinner second gasket 12 are replaced. This allows the diffuser 5 to move away from the base 1 relative to the fuel tank after installation, thereby increasing the nozzle-throat distance. Conversely, when the nozzle-throat distance needs to be decreased, the thinner first gasket 11 and the thicker second gasket 12 are replaced. This allows the diffuser 5 to move closer to the base 1 relative to the fuel tank after installation, thereby decreasing the nozzle-throat distance.

[0047] In actual design, the first gasket 11 and the second gasket 12 are respectively formed by stacking multiple gasket units. The gasket units can be designed as standard gaskets of the same thickness or different thicknesses. For standard gaskets of the same thickness, the thickness of the first gasket 11 and the second gasket 12 can be adjusted by increasing or decreasing the number of standard gaskets. For standard gaskets of different thicknesses, a combination of standard gaskets of different thicknesses can be used to adjust the thickness of the first gasket 11 and the second gasket 12. The specific method is conventional technical means and will not be repeated here.

[0048] Through the above arrangement, when the pressure ratio needs to be adjusted, it is only necessary to increase or decrease the number of gasket units, so that the throat-to-nozzle distance can be changed on the premise of achieving connection between the diffuser 5, the oil tank and the oil pipeline, thereby achieving adjustment of the pressure ratio. The adjustment work is simple, and there is no need to disassemble the main components of the injector. Moreover, the injector does not need to be moved when connected to the oil pipeline, which significantly improves the efficiency of maintenance and debugging and effectively reduces maintenance costs.

[0049] Reference Figure 6 As shown, in the second embodiment, the adjustment assembly includes a hydraulic actuator 13 and a controller 14. The hydraulic actuator 13 is connected to the oil tank and to the diffuser 5. The hydraulic actuator 13 is used to drive the diffuser 5 to move axially relative to the oil tank, and the controller 14 is used to control the operation of the hydraulic actuator 13. The diffuser 5 is connected to a bellows expansion tube 15 at the end away from the throat 4. The diffuser 5 is adapted to communicate with the oil tank outlet through the bellows expansion tube 15.

[0050] Reference Figure 6As shown, specifically, the action of the hydraulic actuator 13 drives the diffuser 5 to move axially relative to the oil tank, and the throat pipe 4 to move axially relative to the nozzle 3 to adjust the throat-to-nozzle distance. The displacement of the diffuser 5 relative to the oil tank is absorbed by the bellows expansion tube 15 to ensure connectivity with the oil tank outlet. The controller 14 is arranged outside the oil tank and is electrically connected to the hydraulic actuator 13. The controller 14 is connected to the control system. The controller 14 can receive instructions sent by the control system and control the operation of the hydraulic actuator 13 to adjust the throat-to-nozzle distance. The hydraulic actuator 13 can be a hydraulic cylinder, the corresponding hydraulic cylinder body is fixed to the oil tank, and the output end is connected to the diffuser 5; the controller 14 can use a servo pump or a servo valve to drive the hydraulic actuator 13, and is compatible with different control system architectures.

[0051] In this embodiment, the pressure ratio can be adjusted by inputting a control instruction into the control system, which is sent by the control system to the controller 14 and controls the action of the hydraulic actuator 13. This can realize automatic adjustment of the throat-to-mouth distance without on-site intervention, and can realize precise adjustment of the throat-to-mouth distance.

[0052] Under this embodiment, during design, a functional relationship between the nozzle-throat distance and the pressure ratio can be established based on test data and calculations, and the functional relationship can be converted into a program algorithm and built into the control system. When the operating conditions change and the pressure ratio needs to be adjusted, personnel can input the target pressure ratio data into the control system in the control room. The system automatically calculates the target value of the nozzle-throat distance and generates a control instruction for the nozzle-throat distance adjustment and sends it to the controller 14. The controller 14 controls the hydraulic actuator 13 to adjust the nozzle-throat distance to the target value.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A variable pressure ratio injector, characterized in that: include: A base (1), the base (1) being connected to a nozzle (3) and a filter housing (2), the filter housing (2) and the base (1) enclosing an oil suction chamber (201), the filter housing (2) being provided with an oil inlet hole (2021) communicating with the oil suction chamber (201) and the outside, the output end of the nozzle (3) being located within the oil suction chamber (201) and the input end being located outside the oil suction chamber (201); A throat pipe (4) and a diffusion pipe (5) are provided outside the oil suction chamber (201); the throat pipe (4) is connected to the filter housing (2) and is coaxial with the nozzle (3); one end of the throat pipe (4) is connected to the oil suction chamber (201), and the other end is coaxially connected to the diffusion pipe (5); the throat pipe (4) is fixed relative to the filter housing (2) in the axial direction; The filter housing (2) is movable relative to the base (1) along the axial direction of the nozzle (3).

2. The variable pressure ratio injector according to claim 1, characterized in that: The filter housing (2) comprises a filter cartridge (202) and an end plate (203); the filter cartridge (202) is cylindrically arranged around the nozzle (3); two ends of the filter cartridge (202) are respectively connected to the end plate (203) and the base (1); the oil inlet hole (2021) is provided on the filter cartridge (202); and the throat pipe (4) is connected to the end plate (203).

3. The variable pressure ratio injector according to claim 2, characterized in that: The filter cartridge (202) is provided with an adjusting member, and the adjusting member is used to adjust the flow area of ​​oil entering the oil suction cavity (201) from outside the oil suction cavity (201).

4. The variable pressure ratio injector according to claim 3, characterized in that: When the filter housing (2) moves relative to the base (1) along the axial direction of the nozzle (3), the flow area of ​​oil entering the oil suction chamber (201) from outside the oil suction chamber (201) is adjusted by the adjusting member.

5. The variable pressure ratio injector according to claim 3 or 4, characterized in that: The filter cartridge (202) is cylindrical and its axis is parallel to the throat pipe (4); a plurality of oil inlet holes (2021) are provided and evenly distributed on the side wall of the filter cartridge (202); The regulating member comprises an regulating cylinder (7), the regulating cylinder (7) being coaxially sleeved outside the filter cylinder (202), the regulating cylinder (7) and the filter cylinder (202) being clearance-matched, a plurality of regulating holes (701) being provided on a side wall of the regulating cylinder (7), the plurality of regulating holes (701) being connected to the plurality of oil inlet holes (2021) in a one-to-one correspondence, the regulating cylinder (7) being rotatable relative to the filter cylinder (202), and changing the connection area between the regulating holes (701) and the corresponding oil inlet holes (2021) during the rotation.

6. The variable pressure ratio injector according to claim 5, characterized in that: The regulating cylinder (7) is restricted from moving axially relative to the filter cylinder (202); a guide groove (702) is provided on the outer wall of the regulating cylinder (7); the guide groove (702) spirally extends around the axis of the regulating cylinder (7); a guide block (9) embedded in the guide groove (702) is connected to the base (1); the guide block (9) can move relative to the regulating cylinder (7) along the length direction of the guide groove (702).

7. A variable pressure ratio injector assembly, characterized in that: The variable pressure ratio injector according to any one of claims 1 to 6, wherein the base (1) is used to be fixed to the oil tank, and the throat (4), the diffuser (5) and the filter housing (2) are movable relative to the oil tank.

8. The variable pressure ratio injector according to claim 7, characterized in that: One end of the diffuser (5) away from the throat pipe (4) is connected to a coaxial mounting flange (501), and both end surfaces of the mounting flange (501) are respectively provided with a first gasket (11) and a second gasket (12); The diffuser (5) has one end away from the throat (4) for passing through the outside of the oil tank, and the first gasket (11) is provided between the mounting flange (501) and the oil tank, and the second gasket (12) is provided between the mounting flange (501) and the oil delivery pipe end flange, so as to limit the axial movement of the diffuser (5) by the first gasket (11) and the second gasket (12), and is suitable for adjusting the position of the diffuser (5) relative to the oil tank in its own axial direction by replacing the first gasket (11) and the second gasket (12) of different thicknesses.

9. The variable pressure ratio injector according to claim 7, characterized in that: The invention also includes an adjustment component, which includes a hydraulic actuator (13) and a controller (14). The hydraulic actuator (13) is used to be connected to the oil tank and connected to the diffuser (5). The hydraulic actuator (13) is used to drive the diffuser (5) to move axially relative to the oil tank. The controller (14) is used to control the operation of the hydraulic actuator (13).

10. The variable pressure ratio injector according to claim 9, characterized in that: The diffuser (5) is connected to a corrugated expansion pipe (15) at one end away from the throat pipe (4), and the diffuser (5) is suitable for communicating with the oil tank outlet through the corrugated expansion pipe (15).

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