Split type centrifugal pump convenient to maintain

Abstract

The invention discloses a split type centrifugal pump convenient to maintain, and belongs to the field of aircraft fuel systems, the split type centrifugal pump convenient to maintain comprises a pump body, a main cavity, an auxiliary cavity and a first fuel runner are arranged in the pump body, the main cavity and the auxiliary cavity are communicated through the first fuel runner, a pump core is arranged in the main cavity, and a sliding valve assembly is arranged in the auxiliary cavity; the pump core comprises a shell, a motor, a rotating shaft and an impeller, the motor drives the impeller to rotate through the rotating shaft, an oil inlet hole and a second fuel oil flow channel are formed in the shell, the impeller and the oil inlet hole are oppositely arranged, the second fuel oil flow channel is communicated with the first fuel oil flow channel, and the oil inlet hole is communicated with the second fuel oil flow channel; the side wall of the auxiliary cavity is provided with an oil inlet used for being communicated with an oil tank, the sliding valve assembly is used for cutting off a channel between the oil inlet and the first fuel oil flow channel in the overhauling process and conducting the channel between the oil inlet and the first fuel oil flow channel in the oil pumping process, and therefore the centrifugal pump can be more convenient to disassemble and maintain.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aircraft fuel system, and particularly relates to a split centrifugal pump convenient to maintain. BACKGROUND

[0002] In the aircraft fuel system, the centrifugal pump belongs to the fuel supply system, which provides the required fuel for the engine, and under the normal flight state and working condition of the aircraft, the fuel of a certain pressure and flow is continuously supplied to the engine in a certain order, and the center of gravity of the aircraft is kept within a certain range during the whole flight.

[0003] At present, the common centrifugal pump is an oil immersion type centrifugal pump installed in the oil tank, which can supply oil to the engine to ensure normal flight of the aircraft. However, the oil immersion type centrifugal pump and the oil tank are an integral structure, and the whole centrifugal pump needs to be disassembled for maintenance, which is not convenient for disassembly and maintenance of the centrifugal pump. SUMMARY

[0004] In order to solve the above problems in the prior art, the present application provides a split centrifugal pump convenient to maintain. The technical problem to be solved by the present application is solved by the following technical scheme: In a first aspect, the present application provides a split centrifugal pump convenient to maintain, comprising a pump body, a main chamber, a secondary chamber and a first fuel flow channel are arranged in the pump body, the main chamber and the secondary chamber are communicated through the first fuel flow channel, a pump core is arranged in the main chamber, and a slide valve assembly is arranged in the secondary chamber; The pump core comprises a shell, a motor, a rotating shaft and an impeller, the motor drives the impeller to rotate through the rotating shaft, an oil inlet hole and a second fuel flow channel are arranged in the shell, the impeller and the oil inlet hole are oppositely arranged, the second fuel flow channel and the first fuel flow channel are communicated, and the oil inlet hole and the second fuel flow channel are communicated; An oil inlet is arranged on the side wall of the secondary chamber for communication with the oil tank, the slide valve assembly is used to cut off the channel between the oil inlet and the first fuel flow channel during maintenance, and the channel between the oil inlet and the first fuel flow channel is opened during oil pumping.

[0005] In an embodiment of the present application, the slide valve assembly comprises a valve body, a spring and a locking mechanism, the valve body comprises a sealing seat and a guide rod, a through hole is arranged on the pump body, the sealing seat is located in the secondary chamber, one end of the guide rod is connected with the sealing seat, and the other end of the guide rod extends out through the through hole and is connected with the locking mechanism; The spring is located between the sealing seat and the secondary chamber, and the spring is used to apply an elastic force to the sealing seat to cut off the channel between the oil inlet and the first fuel flow channel.

[0006] In one embodiment of the present application, the locking mechanism comprises a slide rod, a connecting piece and a locking nut, the connecting piece comprises a first collar part and a second collar part, the first collar part is sleeved on the guide rod and is threadedly connected with the guide rod, the second collar part is sleeved on the slide rod and is in sliding fit with the slide rod, the locking nut is threadedly connected with the slide rod, and the locking nut and the second collar part are in limiting fit.

[0007] In one embodiment of the present application, the sealing seat comprises a bottom plate and an annular enclosing plate, a sealing plate is arranged in the auxiliary chamber, the sealing plate is provided with a through hole, the first fuel flow channel and the auxiliary chamber are communicated through the through hole, a spring is arranged in the annular enclosing plate, and the bottom plate is pressed against the sealing plate under the action force of the spring to cut off the passage between the oil inlet and the first fuel flow channel.

[0008] In one embodiment of the present application, the upper surface of the bottom plate is further provided with a lower annular positioning piece, the lower annular positioning piece is arranged inside the annular enclosing plate and coaxially with the annular enclosing plate, an upper annular positioning piece is further arranged in the auxiliary chamber, one end of the spring is sleeved on the outer periphery of the upper annular positioning piece, and the other end of the spring is sleeved on the outer periphery of the lower annular positioning piece.

[0009] In one embodiment of the present application, the surface of the bottom plate facing the through hole is provided with an annular groove, and a sealing ring is arranged in the annular groove.

[0010] In one embodiment of the present application, a snap spring is further arranged in the pump body, a positioning groove is arranged on the side wall of the main chamber, the snap spring is installed in the positioning groove, and the snap spring and the pump core are in limiting fit.

[0011] In one embodiment of the present application, a drain hole is further arranged in the pump core, the drain hole is communicated with the second fuel flow channel, a plug is arranged in the drain hole, and the plug and the drain hole are threadedly connected.

[0012] In one embodiment of the present application, a motor flange is arranged between the motor and the shell, a clamping groove is arranged on the outer peripheral surface of the motor flange, a positioning protrusion is arranged on the inner wall of the pump body, and the positioning protrusion and the clamping groove are in clamping fit.

[0013] In one embodiment of the present application, lead holes for leading out wires are arranged on the motor flange and the upper portion of the pump core.

[0014] Compared with the prior art, the present application has the following beneficial effects: In the above-described scheme of this application, the split-type centrifugal pump includes a pump body, which contains a main chamber, a secondary chamber, and a first fuel flow channel. The main chamber and the secondary chamber are connected by the first fuel flow channel. The pump core is housed in the main chamber, and a slide valve assembly is housed in the secondary chamber. The pump core includes a housing, a motor, a shaft, and an impeller. The motor drives the impeller to rotate through the shaft. The housing contains an oil inlet and a second fuel flow channel. The impeller and the oil inlet are arranged opposite to each other, and the second fuel flow channel is connected to the first fuel flow channel. The oil inlet and the second fuel flow channel are also connected. The side wall of the secondary chamber has an oil inlet for connecting to the fuel tank. The slide valve assembly is used to cut off the passage between the oil inlet and the first fuel flow channel during maintenance, and to open the passage between the oil inlet and the first fuel flow channel during pumping. With this structure, during maintenance, the passage between the oil inlet and the first fuel flow channel can be cut off first through the slide valve assembly, and then the pump core can be removed from the main chamber for maintenance. It is not necessary to remove the entire centrifugal pump from the fuel tank, making the disassembly and maintenance of the centrifugal pump more convenient.

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a split-type centrifugal pump provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the pump body in an embodiment of the present invention; Figure 3 This is a schematic diagram of the motor flange in an embodiment of the present invention.

[0017] Reference numerals: 100-pump body, 101-positioning protrusion, 200-pump core, 201-plug cap, 300-slide valve assembly, 301-valve body, 302-locking mechanism, 303-spring, 400-circlip, 500-motor flange. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0019] Please see Figure 1 , Figure 2 and Figure 3This invention provides a maintenance-friendly split-type centrifugal pump, including a pump body 100. The pump body 100 has a main chamber, a secondary chamber, and a first fuel flow channel. The main chamber and the secondary chamber are connected by the first fuel flow channel. A pump core 200 is provided in the main chamber, and a slide valve assembly 300 is provided in the secondary chamber. The pump core 200 includes a housing, a motor, a shaft, and an impeller. The motor drives the impeller to rotate through the shaft. The housing has an oil inlet and a second fuel flow channel. The impeller and the oil inlet are arranged opposite to each other. The second fuel flow channel is connected to the first fuel flow channel. The oil inlet and the second fuel flow channel are also connected. The side wall of the secondary chamber has an oil inlet for connecting to the fuel tank. The slide valve assembly 300 is used to cut off the passage between the oil inlet and the first fuel flow channel during maintenance and to open the passage between the oil inlet and the first fuel flow channel during pumping.

[0020] In some embodiments of this application, the outer wall of the pump body 100 is provided with a connecting lug, and the pump body 100 is detachably connected to the oil tank through the connecting lug.

[0021] In some embodiments of this application, the main chamber has an opening on one side, and the pump core 200 extends into the main chamber through the opening.

[0022] In the above-mentioned scheme of this application, the split centrifugal pump includes a pump body 100, which has a main chamber, a secondary chamber, and a first fuel flow channel. The main chamber and the secondary chamber are connected by the first fuel flow channel. The main chamber has a pump core 200, and the secondary chamber has a slide valve assembly 300. The pump core 200 includes a housing, a motor, a shaft, and an impeller. The motor drives the impeller to rotate through the shaft. The housing has an oil inlet and a second fuel flow channel. The impeller and the oil inlet are arranged opposite to each other. The second fuel flow channel is connected to the first fuel flow channel. The oil inlet and the second fuel flow channel are connected. The side wall of the secondary chamber has an oil inlet for connecting to the fuel tank. The slide valve assembly 300 is used to cut off the passage between the oil inlet and the first fuel flow channel during maintenance and to open the passage between the oil inlet and the first fuel flow channel during pumping. With this structure, during maintenance, the channel between the oil inlet and the first fuel flow path can be cut off first through the slide valve assembly 300, and then the pump core 200 can be removed from the main chamber for maintenance. It is not necessary to remove the entire centrifugal pump from the oil tank, making the disassembly and maintenance of the centrifugal pump more convenient.

[0023] In some embodiments of this application, such as Figure 1As shown, the slide valve assembly 300 includes a valve body 301, a spring 303, and a locking mechanism 302. The valve body 301 includes a sealing seat and a guide rod. The pump body 100 has a through hole. The sealing seat is located in the secondary chamber. One end of the guide rod is connected to the sealing seat, and the other end extends through the through hole and is connected to the locking mechanism 302. The spring 303 is located between the sealing seat and the secondary chamber. The spring 303 is used to apply an elastic force to the sealing seat so that the sealing seat cuts off the passage between the oil inlet and the first fuel flow channel. With this structure, during maintenance, after the locking mechanism 302 is loosened, the spring 303 can push the sealing seat to automatically reset, promptly cutting off the connection between the oil inlet and the first fuel flow channel, preventing fuel in the tank from continuing to flow into the pump body 100. This reduces fuel leakage and keeps the operating area clean when the pump core 200 is removed. It also facilitates individual maintenance or replacement of the pump core 200 without removing the entire centrifugal pump from the tank, simplifying the operation process and shortening maintenance time.

[0024] In some embodiments of this application, such as Figure 1 As shown, the locking mechanism 302 includes a slide rod, a connecting member, and a locking nut. The connecting member includes a first ring and a second ring. The first ring is fitted onto the guide rod and threadedly connected to it, while the second ring is fitted onto the slide rod and slidably engaged with it. The locking nut is threadedly connected to the slide rod, and the locking nut and the second ring are in a limiting engagement. With this structure, rotating the locking nut pushes or pulls the connecting member along the slide rod. Since the connecting member is threaded to the guide rod, its movement causes the guide rod and the connected sealing seat to overcome the force of the spring 303, resulting in axial displacement, thus precisely controlling the opening and closing of the sealing seat. When sealing is required, tightening the locking nut will stably press the sealing seat into the sealing position via this transmission chain.

[0025] In some embodiments of this application, such as Figure 1 As shown, the sealing seat includes a base plate and an annular surrounding plate. A sealing plate is provided in the secondary chamber, and the sealing plate has a through hole. The first fuel flow channel and the secondary chamber are connected through the through hole. A spring 303 is disposed inside the annular surrounding plate. Under the action of the spring 303, the base plate is pressed against the sealing plate to cut off the passage between the fuel inlet and the first fuel flow channel. With this structure, the spring 303 is housed inside the annular surrounding plate and separated from the external space. When the pump core 200 needs maintenance, the force of the spring 303 can act directly on the base plate, making it stably press against the through hole of the sealing plate, thereby cutting off the passage of fuel from the fuel inlet to the first fuel flow channel. In this way, during the disassembly of the pump core 200, fuel in the fuel tank will not continuously flow into the pump body 100, creating conditions for the removal of the pump core 200 and simplifying subsequent operations.

[0026] In some embodiments of this application, such as Figure 1As shown, the upper surface of the base plate is also provided with a lower annular positioning component, which is located inside the annular surrounding plate and coaxially arranged with it. An upper annular positioning component is also provided in the secondary chamber. One end of the spring 303 is sleeved on the outer circumference of the upper annular positioning component, and the other end of the spring 303 is sleeved on the outer circumference of the lower annular positioning component. With this structure, the two ends of the spring 303 are respectively sleeved on the upper and lower annular positioning components, ensuring that the spring 303 remains vertical during compression and rebound, preventing skewing or jamming. This ensures that the force of the spring 303 can be applied vertically to the base plate, allowing the base plate to smoothly press against or move away from the sealing plate, thus making the opening and closing of the slide valve smoother and the sealing more reliable.

[0027] In some embodiments of this application, such as Figure 1 As shown, an annular groove is provided on the surface of the base plate facing the through hole, and a sealing ring is installed inside the annular groove. With this structure, when the base plate presses against the sealing plate under the force of spring 303, the sealing ring in the annular groove is squeezed and deformed, filling the microscopic unevenness between the contact surfaces of the base plate and the sealing plate, and preventing fuel leakage from the periphery of the through hole. In this way, when the slide valve assembly 300 cuts off the flow channel, it can effectively prevent fuel from seeping into the main chamber of the pump body 100, thus improving the sealing performance of the slide valve assembly 300.

[0028] In some embodiments of this application, such as Figure 1 As shown, a retaining spring 400 is also provided inside the pump body 100. A positioning groove is provided on the side wall of the main chamber, and the retaining spring 400 is installed in the positioning groove, with the retaining spring 400 and the pump core 200 in a limiting engagement. With this structure, when the pump core 200 is installed into the main chamber, the retaining spring 400 snaps into the positioning groove and forms a limiting engagement with the outer periphery of the pump core 200, thus axially fixing the pump core 200. When maintenance is required, simply remove the retaining spring 400 from the positioning groove, and the pump core 200 can be pulled out of the main chamber axially. This makes the disassembly and assembly of the pump core 200 simple and direct, without disassembling the entire pump body 100.

[0029] In some embodiments of this application, the pump core 200 is further provided with an oil drain hole, which communicates with the second fuel flow channel. A plug cap 201 is provided inside the oil drain hole, and the plug cap 201 is threadedly connected to the oil drain hole. With this structure, before disassembling the pump core 200, the plug cap 201 can be unscrewed from the oil drain hole, allowing residual fuel accumulated in the second fuel flow channel inside the pump core 200 to be discharged through the oil drain hole. This prevents fuel from leaking from inside the pump core 200 into the operating space during the process of pulling the pump core 200 out of the main chamber, maintaining a clean working environment and facilitating subsequent operations on the pump core 200.

[0030] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3As shown, a motor flange 500 is provided between the motor and the housing. A groove is provided on the outer circumferential surface of the motor flange 500, and a positioning protrusion 101 is provided on the inner wall of the pump body 100. The positioning protrusion 101 and the groove engage in a snap-fit ​​relationship. With this structure, when installing the pump core 200 into the pump body 100, simply align the groove on the motor flange 500 with the positioning protrusion 101 on the inner wall of the pump body 100 and push it in; the two will then engage. This fixes the circumferential position of the pump core 200 within the pump body 100, preventing it from rotating during operation. This ensures the correct relative position of rotating components such as the impeller to the flow channel of the pump body 100, and also provides a basis for subsequent axial fixing.

[0031] In some embodiments of this application, such as Figure 1 As shown, both the motor flange 500 and the pump core 200 are provided with lead holes for wire exit. This structure facilitates motor wire exit, and the lead holes can also discharge gas from the pump casing, making it convenient for the installation of the pump core 200.

[0032] In some embodiments of this application, the operation procedure when maintenance is required is as follows: First, after the oil pump is de-energized, the locking nut is loosened. Under the force of the spring 303, the valve body 301 of the slide valve assembly 300 forms a seal with the pump body 100, ensuring that fuel no longer flows into the pump body 100. Next, remove the plug cap 201 and drain the excess fuel from the pump body 100; Finally, remove the retaining ring 400 and smoothly pull the entire pump core 200 out of the pump body 100 axially before performing maintenance.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A split centrifugal pump for ease of maintenance, characterized in that, The pump body is provided with a main chamber, a secondary chamber and a first fuel flow channel, the main chamber and the secondary chamber are communicated through the first fuel flow channel, the main chamber is provided with a pump core, and the secondary chamber is provided with a slide valve assembly; The pump core comprises a shell, a motor, a rotating shaft and an impeller, the motor drives the impeller to rotate through the rotating shaft, the shell is provided with an oil inlet hole and a second fuel flow channel, the impeller and the oil inlet hole are oppositely arranged, the second fuel flow channel and the first fuel flow channel are communicated, and the oil inlet hole and the second fuel flow channel are communicated. The side wall of the secondary chamber is provided with an oil inlet for communicating with an oil tank, the slide valve assembly is used for cutting off the channel between the oil inlet and the first fuel flow channel during maintenance and for guiding the channel between the oil inlet and the first fuel flow channel during oil pumping.

2. The easily maintained split centrifugal pump of claim 1, wherein, The slide valve assembly comprises a valve body, a spring and a locking mechanism, the valve body comprises a sealing seat and a guide rod, the pump body is provided with a through hole, the sealing seat is located in the secondary chamber, one end of the guide rod is connected with the sealing seat, and the other end of the guide rod extends out through the through hole and is connected with the locking mechanism. The spring is located between the sealing seat and the secondary chamber, and the spring is used for applying an elastic force to the sealing seat so as to cut off the channel between the oil inlet and the first fuel flow channel.

3. The easily maintained split centrifugal pump of claim 2, wherein, The locking mechanism comprises a slide rod, a connecting piece and a locking nut, the connecting piece comprises a first ring part and a second ring part, the first ring part is sleeved on the guide rod and is threadedly connected with the guide rod, the second ring part is sleeved on the slide rod and is slidingly matched with the slide rod, the locking nut is threadedly connected with the slide rod, and the locking nut and the second ring part are limitingly matched.

4. The easily maintained split centrifugal pump of claim 2, wherein, The sealing seat comprises a bottom plate and an annular surrounding plate, the secondary chamber is provided with a sealing plate, the sealing plate is provided with a through hole, the first fuel flow channel and the secondary chamber are communicated through the through hole, the spring is arranged in the annular surrounding plate, and the bottom plate is pressed against the sealing plate under the action of the spring so as to cut off the channel between the oil inlet and the first fuel flow channel. The oil inlet is arranged on the side wall of the secondary chamber, and the oil inlet and the annular surrounding plate are oppositely arranged.

5. The easily maintained split centrifugal pump of claim 4, wherein, The upper surface of the bottom plate is further provided with a lower annular positioning piece, the lower annular positioning piece is located inside the annular surrounding plate and is coaxially arranged with the annular surrounding plate, the secondary chamber is further provided with an upper annular positioning piece, one end of the spring is sleeved on the outer periphery of the upper annular positioning piece, and the other end of the spring is sleeved on the outer periphery of the lower annular positioning piece.

6. The easily maintained split centrifugal pump of claim 4, wherein, The surface of the bottom plate facing the through hole is provided with an annular groove, and the annular groove is provided with a sealing ring.

7. The easily maintained split centrifugal pump of claim 1, wherein, The pump body is further provided with a snap spring, the side wall of the main chamber is provided with a positioning groove, the snap spring is installed in the positioning groove, and the snap spring and the pump core are limitingly matched.

8. The easily maintained split centrifugal pump of claim 1, wherein, The pump core is further provided with a drain hole, the drain hole and the second fuel flow channel are communicated, the drain hole is provided with a plug, and the plug and the drain hole are threadedly connected.

9. The low maintenance split case centrifugal pump of claim 1, wherein, The motor and the shell are provided with a motor flange, the outer peripheral surface of the motor flange is provided with a clamping groove, the inner wall of the pump body is provided with a positioning protrusion, and the positioning protrusion and the clamping groove are clamped and matched.

10. The easily maintained split centrifugal pump of claim 9, wherein, The motor flange and the pump core are both provided with a lead hole for leading out a wire.

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