Fuel oil conveying device and auxiliary power device fuel oil system

Abstract

A fuel delivery device and an auxiliary power plant fuel system equipped with the same, the fuel delivery device being connected between a main fuel pipe and an auxiliary fuel pipe, the fuel delivery device comprising: a housing formed as a closed housing and having a peripheral wall portion, a first bottom plate close to an upstream side of a fuel flow path, and a second bottom plate close to a downstream side of the fuel flow path; the main fuel oil through pipe is arranged between the peripheral wall part of the shell and the main fuel oil pipe; the auxiliary fuel oil through pipe is arranged between the peripheral wall part of the shell and the auxiliary fuel oil pipe; the one-way valve is arranged in the auxiliary fuel oil through pipe and allows fuel oil in the auxiliary fuel oil through pipe to flow to the shell; and a fuel recharging mechanism which is provided in the main fuel pipe and which, when the pressure of the main fuel pipe decreases due to the opening of the auxiliary fuel pipe, recharges the fuel supplied from the auxiliary fuel pipe into the housing via the one-way valve into the main fuel pipe. Fuel pressure fluctuation of a main fuel pipe in the starting process of the auxiliary power device can be improved, and the starting reliability is improved.

Description

Technical Field

[0001] The invention relates to a fuel cross-transfer device and a fuel system of an auxiliary power device equipped with the fuel cross-transfer device. Background Art

[0002] In the initial stage of starting the aircraft's auxiliary power unit (hereinafter referred to as APU), the fuel distribution valve is closed and fuel is supplied from the main fuel pipe. When the fuel supply pressure reaches the opening pressure of the distribution valve, the distribution valve opens, and the main fuel pipe and the auxiliary fuel pipe supply fuel at the same time. However, when the distribution valve is opened, since there is no fuel in the auxiliary fuel pipe initially, it takes a certain amount of time to build up the fuel pressure, and the main fuel pipe also drops in pressure instantly due to the fuel supply from the auxiliary fuel pipe, resulting in a decrease in fuel supply pressure and flow, a reduction in atomization effect, and possible flameout, resulting in a start failure, affecting the start reliability.

[0003] As mentioned above, the existing APU fuel system pipeline design has only one fuel distribution valve to control the fuel supply of the main fuel line and the auxiliary fuel line. When the auxiliary fuel line is opened, it is easy to cause the fuel pressure of the main fuel line to drop instantly, affecting the fuel supply and atomization effect of the main fuel line. In addition, the empty path of the auxiliary fuel manifold before starting can easily cause the APU to fail to start, especially in the harsh high-altitude starting environment.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent document 1: CN108561232A

[0007] Patent document 2: CN116044576A

[0008] Patent document 3: US10563588B2 Summary of the invention

[0009] The present invention is made to solve the above technical problems, and its purpose is to provide a fuel cross-transfer device and an auxiliary power unit fuel system equipped with the fuel cross-transfer device, which can improve the fuel pressure fluctuation during APU starting and improve starting reliability.

[0010] 8. The fuel pump of claim 7, wherein the at least one fuel pump has a first end in contact with the fuel line, and the second end in contact with the fuel line. The fuel pump has a first end in contact with the fuel line, and the second end in contact with the fuel line.

[0011] According to the fuel cross-transfer device of this structure, when the pressure of the main fuel pipe drops below the specified pressure due to the opening of the auxiliary fuel pipe in the middle of starting, the fuel stored in the housing can be replenished into the main fuel pipe via the replenishing mechanism. This can avoid excessive pressure fluctuations in the main fuel pipe and improve the reliability of starting.

[0012] In addition, it also includes at least one accumulator, through which a fuel transfer chamber is separated in the shell, and the fuel in the auxiliary fuel pipe is supplied to the fuel transfer chamber via the one-way valve, and the accumulator is pressurized.

[0013] By arranging a pressure accumulator, a fuel transfer chamber can be separated in the housing by the pressure accumulator. In addition, when fuel is replenished by the oil replenishing mechanism, the pressure accumulator can be used to assist the fuel replenishment to the main fuel pipe.

[0014] Preferably, the oil replenishing mechanism includes a cover shell, a slider through-tube and an elastic member, the cover shell is formed into a hollow cylinder with a bottom, and is arranged in a position opposite to the main fuel through-tube in the fuel transfer chamber, the slider through-tube has a cylinder bottom, a cylinder wall and at least one through-hole, the through-hole passes through the cylinder wall, the slider through-tube is arranged inside the cover shell and the main fuel through-tube in a manner that it can slide between the cover shell and the main fuel through-tube, the elastic member is arranged in the cover shell, one end of which is connected to the bottom of the cover shell, and the other end is connected to the cylinder bottom of the slider through-tube, the position of the through-hole is set so that when the pressure in the main fuel pipe is less than a specified pressure, it can be exposed from the cover shell under the force of the elastic member, thereby connecting the fuel transfer chamber with the main fuel through-tube.

[0015] According to this structure, by providing an oil replenishing mechanism including a cover shell, a slider through-tube and an elastic member, when the pressure in the fuel pipe drops below a specified pressure, the fuel transfer chamber can be connected to the main fuel through-tube through the through hole of the slider through-tube to perform the oil replenishing action.

[0016] Furthermore, the pressure accumulator includes a plate portion formed to partition the interior of the housing in a liquid-tight manner, and a force storage mechanism provided between the plate portion and the housing.

[0017] According to this structure, the plate portion separates the interior of the housing in a liquid-tight manner, thereby forming a fuel transfer chamber. In addition, the accumulator mechanism accumulates pressure, and when the fuel is replenished to the main fuel pipe via the replenishing mechanism, the accumulator mechanism extends and pushes the plate portion, thereby assisting the replenishment of fuel to the main fuel pipe.

[0018] In addition, the accumulator includes at least one pressure accumulator capsule and a bracket. The pressure accumulator capsule is fixed to the inside of the shell through the bracket. The fuel transfer chamber is formed by the pressure accumulator capsule, the bracket and the shell. A specified amount of inert gas is filled in the pressure accumulator capsule, and the pressure accumulator capsule can be elastically deformed.

[0019] Another type of pressure accumulator includes at least one pressure accumulator capsule and a bracket, wherein a specified amount of inert gas is filled in the pressure accumulator capsule, and the pressure accumulator capsule can be elastically deformed. This can also store pressure and help fuel to be added to the main fuel pipe.

[0020] Preferably, the fuel cross-transfer device includes two accumulators, one of which is disposed on the upstream side of the fuel flow path of the housing, and the other of which is disposed on the downstream side of the fuel flow path of the housing.

[0021] According to this configuration, one accumulator is provided on each of the upstream side and the downstream side of the fuel flow path of the casing, so that the main fuel pipe can be replenished with fuel evenly and sufficiently.

[0022] In addition, the force storage mechanism is a spring, one end of the spring of the accumulator on one side is connected to the plate portion of the accumulator on one side, and the other end is connected to the second bottom plate on the upstream side of the fuel flow path of the shell, and one end of the spring of the accumulator on the other side is connected to the plate portion of the accumulator on the other side, and the other end is connected to the first bottom plate on the downstream side of the fuel flow path of the shell.

[0023] A spring is used as a force storage mechanism, which has a simple structure and is easy to install.

[0024] In addition, the fuel cross-transfer device includes two accumulators, one of which is disposed on the upstream side of the fuel flow path of the housing, and the other of which is disposed on the downstream side of the fuel flow path of the housing.

[0025] Preferably, the plurality of through holes are evenly arranged in the circumferential direction of the cylindrical wall portion.

[0026] By evenly providing a plurality of through holes in the circumferential direction of the cylinder wall portion, when the pressure of the main fuel pipe drops due to the opening of the pilot fuel pipe, the fuel replenishment operation can be performed quickly.

[0027] Another embodiment of the present invention relates to an auxiliary power unit fuel system, comprising a fuel cross-transfer device; a main fuel pipe, the main fuel pipe constituting a main oil circuit, supplying fuel supplied from a fuel module to a fuel nozzle; an auxiliary fuel pipe, the auxiliary fuel pipe constituting an auxiliary oil circuit, supplying fuel supplied from the fuel module to the fuel nozzle, the fuel cross-transfer device being connected between the main fuel pipe and the auxiliary fuel pipe.

[0028] The auxiliary power unit fuel system of this structure can avoid the instantaneous drop of fuel pressure in the main fuel circuit when the auxiliary fuel circuit is opened, thereby affecting the fuel supply and atomization effect of the main fuel circuit, and can improve the fuel pressure fluctuation during the APU starting process and improve the starting reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a diagram showing the piping structure of the fuel system of the auxiliary power unit equipped with the fuel cross-transfer device according to the first embodiment of the present invention.

[0030] Figure 2 It is a cross-sectional view showing the structure of the fuel delivery device according to the first embodiment of the present invention.

[0031] Figure 3 1. The drawings show the structure of a slider through-pipe of a fuel delivery device according to a first embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

[0032] Figure 4 This is another cross-sectional view showing the structure of the fuel delivery device according to the first embodiment of the present invention.

[0033] Figure 5 It is another cross-sectional view showing the structure of the fuel delivery device according to the first embodiment of the present invention.

[0034] Figure 6 It is a cross-sectional view showing the structure of a fuel delivery device according to a second embodiment of the present invention.

[0035] Figure 7 1 is a flowchart showing the operation of the fuel delivery device according to the first embodiment of the present invention.

[0036] (Explanation of symbols)

[0037] 1Auxiliary power unit fuel system

[0038] 10 Fuel Module

[0039] 20 Combustion chamber

[0040] 30 fuel nozzle

[0041] 40 Main fuel pipe

[0042] 50 auxiliary fuel pipe

[0043] 60 Fuel transfer device

[0044] 61 Fuel transfer chamber

[0045] 62 Main fuel pipe

[0046] 63 Auxiliary fuel oil pipe

[0047] 64 housing

[0048] 65 Slider Through Pipe

[0049] 651 tube bottom

[0050] 652 cylinder wall

[0051] 653 through hole

[0052] 66 Check valve

[0053] 67 Elastic member

[0054] 68 Accumulator

[0055] 681 Board

[0056] 682 power storage mechanism

[0057] 69 Shell

[0058] 691 wall

[0059] 692 First Base Plate

[0060] 693 Second Base Plate

[0061] 78 Pressure Storage Capsules

[0062] 79 bracket DETAILED DESCRIPTION

[0063] Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In each figure, the same symbols are marked for the same components, and repeated descriptions are sometimes omitted. In addition, in each figure, in order to facilitate the understanding of the content of the present invention, the size and shape are sometimes partially exaggerated. In addition, in the following specific description, directional terms such as "upper", "lower", "inner", "outer", "vertical", "horizontal" and the like are used for illustrative purposes and are not restrictive.

[0064] (First Embodiment)

[0065] First, refer to Figures 1 to 5The structure of the fuel delivery device according to the first embodiment of the present invention will be described.

[0066] Figure 1 1 is a diagram showing the piping structure of the fuel system of the auxiliary power unit equipped with the fuel cross-transfer device according to the first embodiment of the present invention. Figure 1 As shown, the auxiliary power unit fuel system 1 mainly includes: a fuel module 10, a combustion chamber 20, a fuel nozzle 30, a main fuel pipe 40, an auxiliary fuel pipe 50 and a fuel cross-transfer device 60.

[0067] The fuel module 10 is used to supply fuel. The fuel supplied from the fuel module 10 is supplied to the fuel nozzle 30 via the main fuel pipe 40 and the auxiliary fuel pipe 50, and then burns in the combustion chamber 20 through the fuel nozzle 30 to provide power. Figure 1 As indicated by the arrow in .

[0068] The main fuel pipe 40 forms a main fuel circuit, and the auxiliary fuel pipe 50 forms an auxiliary fuel circuit. The fuel cross-transfer device 60 is connected between the main fuel pipe 40 and the auxiliary fuel pipe 50 .

[0069] Regarding the structure of the fuel transfer device 60, Figure 2 As shown, it mainly includes a fuel transfer chamber 61, a main fuel pipe 62, an auxiliary fuel pipe 63, a cover 64, a slider pipe 65, a one-way valve 66, an elastic member 67, at least one accumulator 68, and a shell 69.

[0070] The housing 69 is formed as a sealed housing and has a peripheral wall portion 691, a first bottom plate 692 close to the upstream side of the fuel flow path, and a second bottom plate 693 close to the downstream side of the fuel flow path.

[0071] The main fuel passage 62 is disposed between the peripheral wall portion 691 of the housing 69 and the main fuel pipe 40, and connects the fuel exchange chamber 61 disposed inside the housing 69 with the main fuel pipe 40. The auxiliary fuel passage 63 is disposed between the peripheral wall portion 691 of the housing 69 and the auxiliary fuel pipe 50, and connects the fuel exchange chamber 61 disposed inside the housing 69 with the auxiliary fuel pipe 50.

[0072] The cover 64 is formed in a bottomed hollow cylindrical shape and has a bottom 641 and a wall portion 642. The cover 64 is provided at a position in the fuel delivery chamber 61 opposite to the main fuel passage 62 by means of a mounting member (not shown). The opening of the cover 64 is aligned with the opening of the main fuel passage 62, and the inner diameter of the cover 64 is consistent with the inner diameter of the main fuel passage 62. In addition, a gap S is provided between the opening of the cover 64 and the peripheral wall portion 691 of the housing 69.

[0073] The structure of the slider through pipe 65 is as follows Figure 3As shown in FIG. 1 , the slider through-tube 65 is formed into a hollow cylinder with a bottom, and has a cylinder bottom 651, a cylinder wall 652, and at least one through-hole 653, and the through-hole 653 penetrates the cylinder wall 652. The outer diameter of the slider through-tube 65 is substantially consistent with the inner diameter of the slider through-tube 65 and the inner diameter of the main fuel through-tube 62, and the slider through-tube 65 is arranged inside the cover 64 and the main fuel through-tube 62 in a manner that it can slide between the cover 64 and the main fuel through-tube 62. The position of the through-hole 653 is arranged so that when the pressure P2 of the main fuel pipe 40 decreases due to the opening of the auxiliary fuel pipe, the through-hole 653 is exposed from the cover 64 under the force of the elastic member 67, and communicates with the fuel transfer chamber 61 through the gap S between the opening of the cover 64 and the peripheral wall 691 of the housing 69.

[0074] The elastic member 67 is disposed in the housing 64 , one end of which is connected to the bottom 641 of the housing 64 , and the other end of which is connected to the bottom 651 of the slider through-tube 65 .

[0075] The cover 64 , the slider through-tube 65 , and the elastic member 67 together constitute an oil replenishing mechanism.

[0076] Regarding the structure of the pressure accumulator 68, in this embodiment, an example is given in which one pressure accumulator is provided on the first bottom plate 692 side and one pressure accumulator is provided on the second bottom plate 693 side in the housing 69. Since the structures of the pressure accumulators are the same, the pressure accumulator provided on the second bottom plate 693 side is given as an example.

[0077] like Figure 2 As shown, the accumulator 68 includes a plate portion 681 and a force storage mechanism 682. As an example, the force storage mechanism is a spring. The plate portion 681 is formed to separate the interior of the housing 69 in a liquid-tight manner. The force storage mechanism 682 is arranged between the plate portion 681 and the second bottom plate 693 of the housing 69, one end of which is connected to the plate portion 681, and the other end is connected to the second bottom plate 693 of the housing 69. By providing the accumulator 68, a fuel delivery chamber 61 is separated in the housing 69. During normal operation, the fuel flowing in the auxiliary fuel pipe 50 is replenished into the fuel delivery chamber 61 via the one-way valve 66, and the plate portion 681 is pushed, thereby compressing the force storage mechanism 682, and pressure is accumulated through the force storage mechanism 682. When the main fuel pipe 40 is replenished with fuel via the oil replenishment mechanism, the force storage mechanism 682 extends and pushes the plate portion 681, assisting the fuel replenishment to the main fuel pipe. By providing the accumulator 68, it can be ensured that there is sufficient pressure for replenishment when the main fuel pipe 40 needs to be replenished with fuel.

[0078] The one-way valve 66 is disposed in the auxiliary fuel pipe 63 , allowing the fuel in the auxiliary fuel pipe 50 to flow to the fuel transfer chamber 61 , and preventing the fuel in the fuel transfer chamber 61 from flowing to the auxiliary fuel pipe 50 .

[0079] Next, the operation of the fuel delivery device of this embodiment will be described.

[0080] like Figure 7 As shown, through the previous operation process, the fuel flowing in the auxiliary fuel pipe 50 is stored in the fuel transfer chamber 61 through the one-way valve 66. Since during the operation, the fuel also flows in the main fuel pipe 40, the elastic member 67 is compressed under the action of the pressure P2 of the main fuel pipe 40, the slider through pipe 65 is pushed into the cover 64, and the through hole 653 is closed by the cover 64, so that the fuel is kept stored in the fuel transfer chamber 61.

[0081] After the APU is stopped, since there is no fuel supply in the main fuel pipe 40, the pressure P2 of the main fuel pipe 40 decreases, and the slider through-tube 65 is pushed into the main fuel through-tube 62 under the force of the elastic member 67. The position of the slider through-tube 65 is as shown in FIG. Figure 2 As shown, the through hole 653 is closed by the main fuel through pipe 62, and the fuel is still stored in the fuel transfer chamber 61.

[0082] In the initial stage of starting, no fuel flows through the auxiliary fuel pipe 50, but fuel flows through the main fuel pipe 40. Under the action of the pressure P2 of the main fuel pipe 40, the elastic member 67 is compressed, and the slider through-tube 65 is pushed into the housing 64. The position of the slider through-tube 65 is as shown in FIG. Figure 4 As shown, the through hole 653 is closed by the cover 64 , and the fuel replenished by the previous operation is still stored in the fuel transfer chamber 61 .

[0083] In the middle of starting, when the auxiliary fuel pipe 50 is opened and the pressure P2 of the main fuel pipe 40 drops to a specified pressure, the slider through-tube 65 is pushed toward the main fuel through-tube 62 by the force of the elastic member 67. Under the combined effect of the pressure P2 of the main fuel pipe 40 and the force of the elastic member 67, the position of the slider through-tube 65 is changed as shown in FIG. Figure 5 As shown, the through hole 653 is in a state of being connected to the fuel delivery chamber 61, and the fuel stored in the fuel delivery chamber 61 can be supplied to the main fuel pipe 40 through the through hole 653. Along with this, the power storage mechanism 682 extends and pushes the plate portion 681, thereby assisting the fuel to be replenished to the main fuel pipe 40. In this way, it is possible to avoid excessive pressure fluctuations in the main fuel pipe 40, thereby improving starting reliability.

[0084] After the pressure P2 of the main fuel pipe 40 is increased and then stabilized by the fuel replenishment, the slider through-tube 65 is pushed into the cover 64 under the action of the pressure P2 of the main fuel pipe 40, and the through-hole 653 is closed by the cover 64. In addition, the pressure P1 of the fuel transfer chamber 61 is reduced due to the fuel replenishment, and the one-way valve 66 is opened under the action of the pressure P3 of the auxiliary fuel pipe 50, so that the fuel is stored in the fuel transfer chamber 61.

[0085] The above steps are repeated.

[0086] According to the fuel transfer device of the above structure, the fuel flowing in the auxiliary fuel pipe can be stored in the fuel transfer chamber through the one-way valve during the previous operation. In the middle of starting, when the pressure of the main fuel pipe drops due to the opening of the auxiliary fuel pipe, the fuel stored in the fuel transfer chamber can be supplemented into the main fuel pipe through the through hole of the oil replenishing mechanism.

[0087] In addition, by providing an accumulator, it is possible to assist in replenishing fuel to the main fuel pipe.

[0088] It can avoid excessive pressure fluctuations in the main fuel pipe, thereby improving starting reliability.

[0089] (Second Embodiment)

[0090] In the first embodiment, the pressure accumulator is described as including a plate portion and a force storage mechanism, i.e., a spring. In contrast, in the second embodiment, a pressure storage capsule is used as the pressure accumulator. The structure, function, and effect not specifically described in the second embodiment are the same as those in the first embodiment. In the second embodiment, the description will be centered on the differences from the first embodiment.

[0091] Figure 6 2 is a cross-sectional view showing the structure of a fuel transfer device according to a second embodiment of the present invention. Figure 6 As shown, at least one pressure accumulator capsule 78 as a pressure accumulator is fixed to the inside of the housing 69 through a bracket 79. The fuel transfer chamber 61 is formed by the pressure accumulator capsule 78, the bracket 79 and the housing 69. A prescribed amount of inert gas is filled in the pressure accumulator capsule 78.

[0092] The pressure storage capsule 78 is elastically deformable. The fuel flowing in the auxiliary fuel pipe 50 is compressed and pressurized when it is stored in the fuel transfer chamber 61 through the one-way valve 66. It expands when the fuel stored in the fuel transfer chamber 61 is supplied to the main fuel pipe 40 through the through hole 653, thereby helping to replenish the fuel to the main fuel pipe 40.

[0093] According to the fuel delivery device of the second embodiment, substantially the same operational effects as those of the first embodiment can be achieved.

[0094] The above describes the embodiments of the present invention and its variations, but it should be understood that the present disclosure is not limited to the above embodiments and structures. The present disclosure also includes various variations and variations within the equivalent range. In addition, various combinations and methods, and other combinations and methods including only one element, above or below them, also belong to the scope and thought range of the present disclosure.

[0095] The dimensions of the fuel transfer chamber, the cover, the fuel through-tube, the dimensions of the slider through-tube, the through-hole size / shape, the arrangement angle of the slider through-tube, and the spring force of the accumulator can be determined through experiments and adjusted according to the specifications of the APU.

Claims

1. A fuel transfer device, characterized in that: The fuel cross-transfer device (60) is connected between the main fuel pipe (40) and the auxiliary fuel pipe (50), and comprises: A housing (69) formed as a closed housing having a peripheral wall portion (691), a first bottom plate (692) close to the upstream side of the fuel flow path, and a second bottom plate (693) close to the downstream side of the fuel flow path; A main fuel pipe (62), the main fuel pipe being arranged between the peripheral wall of the housing and the main fuel pipe; An auxiliary fuel oil passage (63), the auxiliary fuel oil passage being arranged between the peripheral wall portion of the shell and the auxiliary fuel oil pipe; a one-way valve (66), the one-way valve being arranged in the auxiliary fuel pipe and allowing the fuel in the auxiliary fuel pipe to flow toward the housing; and The oil replenishing mechanism is arranged in the main fuel pipe, and when the pressure of the main fuel pipe drops due to the opening of the auxiliary fuel pipe, the fuel supplied from the auxiliary fuel pipe to the housing through the one-way valve is replenished into the main fuel pipe.

2. The fuel transfer device according to claim 1, characterized in that: It also includes at least one accumulator (68), through which a fuel transfer chamber (61) is separated in the housing, and the fuel in the auxiliary fuel pipe is supplied to the fuel transfer chamber via the one-way valve, and the accumulator is pressurized.

3. The fuel transfer device according to claim 2, characterized in that: The oil replenishing mechanism comprises a cover shell (64), a slide block through pipe (65) and an elastic member (67). The cover is formed into a hollow cylinder with a bottom, and is arranged in the fuel transfer chamber at a position opposite to the main fuel passage. The slider through-tube has a bottom portion (651), a wall portion (652) and at least one through-hole (653), wherein the through-hole penetrates the wall portion, and the slider through-tube is arranged inside the housing and the main fuel through-tube in a manner that the slider through-tube can slide between the housing and the main fuel through-tube. The elastic member is arranged in the housing, one end of which is connected to the bottom (641) of the housing, and the other end of which is connected to the bottom of the slide block through pipe. The position of the through hole is set so that when the pressure of the main fuel pipe is lower than a specified pressure, the through hole can be exposed from the cover shell under the force of the elastic member to connect the fuel transfer chamber with the main fuel through pipe.

4. The fuel transfer device according to claim 2, characterized in that: The pressure accumulator comprises a plate portion (681) and a force storage mechanism (682). The plate portion is formed to separate the interior of the housing in a liquid-tight manner. The force storage mechanism is disposed between the plate portion and the housing.

5. The fuel transfer device according to claim 2, characterized in that: The pressure accumulator comprises at least one pressure accumulator capsule (78) and a bracket (79). The pressure storage capsule is fixed inside the shell through the bracket. The fuel transfer chamber is formed by the pressure accumulator capsule, the bracket and the shell. A predetermined amount of inert gas is filled in the pressure storage capsule, and the pressure storage capsule is elastically deformable.

6. The fuel transfer device according to claim 4, characterized in that: The fuel cross-transfer device comprises two accumulators, One of the pressure accumulators is provided on the upstream side of the fuel flow path of the casing, and the other of the pressure accumulators is provided on the downstream side of the fuel flow path of the casing.

7. The fuel transfer device according to claim 6, characterized in that: The force storage mechanism is a spring, One end of the spring of the pressure accumulator is connected to the plate portion of the pressure accumulator, and the other end is connected to a second bottom plate (693) on the upstream side of the fuel flow path of the housing. One end of the spring of the other accumulator is connected to the plate portion of the other accumulator, and the other end is connected to a first bottom plate (692) on the downstream side of the fuel flow path of the housing.

8. The fuel transfer device according to claim 5, characterized in that: The fuel cross-transfer device comprises two accumulators, One of the pressure accumulators is provided on the upstream side of the fuel flow path of the casing, and the other of the pressure accumulators is provided on the downstream side of the fuel flow path of the casing.

9. The fuel transfer device according to claim 3, characterized in that: A plurality of through holes are evenly arranged in the circumferential direction of the cylinder wall portion.

10. A fuel system for an auxiliary power unit, characterized in that: A fuel transfer device comprising the fuel transfer device according to any one of claims 1 to 9; a main fuel pipe (40), the main fuel pipe constituting a main fuel circuit for supplying fuel supplied from the fuel module (10) to the fuel nozzle (30); an auxiliary fuel pipe (50), the auxiliary fuel pipe constituting an auxiliary fuel path for supplying the fuel supplied from the fuel module to the fuel nozzle, The fuel cross-transfer device is connected between the main fuel pipe and the auxiliary fuel pipe.

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