Self-pressurization oil tank with inhaul cable type pressurization function

Abstract

The invention belongs to the technical field of hydraulic pressure, and discloses an inhaul cable type pressurization self-pressurization oil tank which comprises a high-pressure cylinder, a high-pressure piston, a tank body and a low-pressure piston, the high-pressure cylinder is arranged on one side of the tank body, a high-pressure medium is arranged in the high-pressure cylinder, a low-pressure medium is arranged in the tank body, and the high-pressure piston can be transversely and movably arranged in the high-pressure cylinder; the low-pressure piston can be transversely and movably arranged in the box body, the high-pressure piston separates cavities in the two sides of the high-pressure cylinder, and the low-pressure piston separates cavities in the two sides of the box body; the ends of one sides of the high-pressure piston and the low-pressure piston are connected through a pulley assembly, and the pulley assembly enables movement of the high-pressure piston or the low-pressure piston to drive the other piston to move. On the premise that the self-pressurization function of oil in the box body can be achieved, the axial length is greatly reduced, oil can be conveniently installed on a plane, meanwhile, parts such as a piston rod are saved, the weight is reduced, and the flight efficiency of the plane is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic pressure, and relates to a self-pressurizing oil tank, in particular to a cable-slinging pressurizing self-pressurizing oil tank. BACKGROUND

[0002] The self-pressurizing oil tank is mainly used for storing hydraulic oil of an aircraft hydraulic system, providing oil with a certain pressurization pressure for a hydraulic pump, and can read the oil level of the tank and provide an exhaust port for the hydraulic system.

[0003] The self-pressurizing hydraulic oil tank is generally in a cylindrical structure, comprising an oil storage cavity and a pressurizing cavity, the oil storage cavity is used for storing oil, and the pressurizing cavity is used for introducing system high-pressure oil, the piston acts on the oil storage cavity to provide the pump with hydraulic oil with a certain pressure, and the oil tank can effectively isolate air, has a reliable structure and stable work.

[0004] However, the traditional oil tank has the problem that the high-pressure cylinder is installed in the extending direction of the tank body, the pressurization is realized by pulling the piston through the piston rod, and the length of the entire oil tank is approximately equal to the sum of the lengths of the tank body and the high-pressure cylinder, which greatly affects the installation of the equipment cabin and the pipeline arrangement of the equipment cabin. SUMMARY

[0005] In order to solve the above problems, the present application provides a cable-slinging pressurizing self-pressurizing oil tank, the high-pressure cylinder is fixed on the side wall of the tank body, the high-pressure piston and the low-pressure piston are connected through a cable, and the two changes of direction of the tension are realized through a fixed pulley, the oil in the tank body is compressed to realize the pressurization function, the problem of the length of the traditional oil tank being too long because the high-pressure cylinder is installed in the extending direction of the tank body is solved, and the piston rod and other parts are omitted, thereby reducing the weight of the oil tank.

[0006] The technical scheme of the present application is as follows: A cable-slinging pressurizing self-pressurizing oil tank, comprising a high-pressure cylinder, a high-pressure piston, a tank body and a low-pressure piston, the high-pressure cylinder is arranged on one side of the tank body, the high-pressure cylinder is provided with high-pressure medium, the tank body is provided with low-pressure medium, the high-pressure piston is arranged in the high-pressure cylinder and can move horizontally, the low-pressure piston is arranged in the tank body and can move horizontally, the high-pressure piston separates the cavities on both sides of the high-pressure cylinder, and the low-pressure piston separates the cavities on both sides of the tank body; one end of the high-pressure piston and one end of the low-pressure piston are connected through a pulley assembly, and the pulley assembly enables the movement of the high-pressure piston or the low-pressure piston to drive the movement of the other piston.

[0007] Further, the pulley assembly comprises a cable, a pulley I and a pulley II, the cable is connected to the high-pressure piston and the low-pressure piston at two ends respectively, the cable is bent by 90 degrees under the joint action of the pulley I and the pulley II, and the section of the cable connected to the high-pressure piston is parallel to the section of the cable connected to the low-pressure piston.

[0008] Further, the right side of the tank is provided with a main cover, the main cover is respectively provided with an exhaust pipe joint, an oil return pipe joint and an oil suction pipe joint, the cable is arranged at the right side of the low-pressure piston and passes out from the main cover; the cable and the main cover are provided with a sealing structure.

[0009] Further, the high-pressure cylinder is arranged along the axial direction of the tank, the right end of the high-pressure cylinder is fixedly connected to the main cover through a secondary cover, the left end of the high-pressure cylinder is flush with the left end of the tank, the cable is arranged at the right side of the high-pressure piston and passes out from the secondary cover; the cable and the secondary cover are provided with a sealing structure.

[0010] Further, the pulley I is fixed at a position deviated from the center of the secondary cover by half the diameter of the pulley, so that the cable can pull the high-pressure piston along the axial direction of the high-pressure cylinder; the pulley II is fixed at a position deviated from the center of the main cover by half the diameter of the pulley, so that the cable can pull the low-pressure piston along the axial direction of the tank.

[0011] Further, the diameter of the high-pressure cylinder is smaller than the diameter of the tank.

[0012] Further, the secondary cover is provided with a booster pipe joint.

[0013] Further, the main cover and the rear cover installed at the left end of the tank are respectively provided with two fixed mounting holes, which are used for the installation and fixation of the oil tank on a fixed plane, the dust cover is installed at the left end of the high-pressure cylinder to prevent excess substances from falling into the high-pressure cylinder.

[0014] The advantages of the present application are as follows: The self-boosting oil tank can realize the self-boosting function of the oil liquid in the tank, greatly reduces the axial length, facilitates the installation of the oil liquid on the machine, saves the piston rod and other parts, and reduces the weight. For high-end equipment such as aircraft, it is rare and valuable, and improves the flight efficiency of the aircraft. The oil tank structure can also integrate the fixed mounting hole, the mechanical oil level indicator, the low liquid level alarm, the oil leakage collection joint and other functional components. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0016] Figure 1 A schematic diagram of a cable type self-boosting oil tank with booster provided by an embodiment of the present application; Among them, 1 High-pressure cylinder, 2 High-pressure piston, 3 Cable, 4 Secondary cover, 5 Pressurizing pipe joint, 6 Pulley I, 7 Exhaust pipe joint, 8 Oil return pipe joint, 9 Pulley II, 10 Oil suction pipe joint, 11 Main cover, 12 Casing, 13 Low pressure piston, 14 Rear cover, 15 Oil leakage collection joint, 16 Dust cover. DETAILED DESCRIPTION

[0017] So that the objectives, technical solutions and advantages of the embodiments of the present application are more apparent, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments below is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific settings and methods presented below, but covers any improvements, replacements and modifications of structures, methods and devices without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary obscuring of the present application.

[0019] In the description of the present application, it should be noted that the directions or position relationships belonging to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are the directions or position relationships described based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as limiting the present application. In addition, the ordinal words (for example, "first and second", etc.) are used to distinguish objects, and are not limited to the order, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms of "mounting", "connecting", "connecting" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be mutually referenced and quoted. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] First embodiment: A cable type pressurized self-pressurized oil tank, comprising a high-pressure cylinder 1, a high-pressure piston 2, a tank body 12 and a low-pressure piston 13, the high-pressure cylinder 1 is arranged on one side of the tank body 12, the high-pressure cylinder 1 is provided with high-pressure medium, the tank body 12 is provided with low-pressure medium, the high-pressure piston 2 is arranged in the high-pressure cylinder 1 and can move horizontally, the low-pressure piston 13 is arranged in the tank body 12 and can move horizontally, the high-pressure piston 2 separates the cavities on both sides of the high-pressure cylinder 1, and the low-pressure piston 13 separates the cavities on both sides of the tank body 12; one end of the high-pressure piston 2 and the low-pressure piston 13 is connected through a pulley assembly, and the pulley assembly enables the movement of the high-pressure piston 2 or the low-pressure piston 13 to drive the movement of the other piston.

[0023] The pulley assembly comprises a cable 3, a pulley I 6 and a pulley II 9, the cable 3 is connected to the high-pressure piston 2 and the low-pressure piston 13 at both ends respectively, the cable 3 is folded by 90° under the joint action of the pulley I 6 and the pulley II 9, and the section of the cable 3 connected to the high-pressure piston 2 is parallel to the section of the cable 3 connected to the low-pressure piston 13.

[0024] The right side of the tank body 1 is provided with a main cover 11, the main cover 11 is respectively provided with an exhaust pipe joint 7, an oil return pipe joint 8 and an oil suction pipe joint 10, and the cable 3 is arranged on the right side of the low-pressure piston 13 and passes out from the main cover 11; a sealing structure is arranged between the cable 3 and the main cover 11.

[0025] The high-pressure cylinder 1 is arranged axially along the tank body 12, the right end of the high-pressure cylinder 1 is fixedly connected to the main cover 11 through a sub-cover 4, the left end of the high-pressure cylinder 1 is flush with the left end of the tank body 1, and the cable 3 is arranged on the right side of the high-pressure piston 2 and passes out from the sub-cover 4; a sealing structure is arranged between the cable 3 and the sub-cover 4.

[0026] The pulley I 6 is fixed at a position deviated from the center of the sub-cover 4 by half the diameter of the pulley, so that the cable 3 can pull the high-pressure piston 2 along the axial direction of the high-pressure cylinder 1; the pulley II 9 is fixed at a position deviated from the center of the main cover 11 by half the diameter of the pulley, so that the cable 3 can pull the low-pressure piston 13 along the axial direction of the tank body 12.

[0027] The diameter of the high-pressure cylinder 1 is smaller than the diameter of the tank body 12.

[0028] The sub-cover 4 is provided with a booster pipe joint 5.

[0029] The main cover 11 and the rear cover 14 installed at the left end of the tank body 12 are each provided with two fixed mounting holes for the installation and fixation of the oil tank on a fixed plane, and the dust cover 16 is installed at the left end of the high-pressure cylinder 1 to prevent excess substances from falling into the high-pressure cylinder 1.

[0030] Second embodiment: The self-pressurized oil tank provided by the application comprises a high-pressure cylinder 1, a high-pressure piston 2, a cable 3, a sub-cover 4, a booster pipe joint 5, a pulley I 6, an exhaust pipe joint 7, an oil return pipe joint 8, a pulley II 9, an oil suction pipe joint 10, a main cover 11, a tank body 12, a low-pressure piston 13, a rear cover 14, an oil leakage collection joint 15 and a dust cover 16. The main cover 11 and the rear cover 14 are fixed at the bottom of the tank body 12 respectively; the sub-cover 4 is fixed at the bottom of the high-pressure cylinder 1; the high-pressure cylinder 1 is arranged along the axial direction of the tank body 12 and is fixed on the main cover 11 at one side through the sub-cover 4 and is directly fixed on the rear cover 14 at the other side, and the diameter of the high-pressure cylinder 1 is smaller than the diameter of the tank body 12; the high-pressure piston 2 and the low-pressure piston 13 are fixed together with the two ends of the cable 3 and reciprocate in the high-pressure cylinder 1 and the tank body 12 respectively; the pulley I 6 is fixed on the sub-cover 4, and the pulley II 9 is fixed on the main cover 11 to change the force direction of the cable 3; the booster pipe joint 5 is fixed on the sub-cover 4 and is connected to the high-pressure cavity composed of the high-pressure piston 2 and the high-pressure cylinder 1; the exhaust pipe joint 7, the oil return pipe joint 8 and the oil suction pipe joint 10 are fixed to the main cover 5 and pass into the tank body.

[0031] The main cover 11 and the rear cover 14 are each provided with two fixed mounting holes for the installation and fixation of the oil tank on a fixed plane, and the dust cover 16 is installed at the tail end of the high-pressure cylinder 1 to prevent excess substances from falling into the high-pressure cylinder cavity.

[0032] The pulley I 6 is fixed at a position offset by half the diameter of the pulley from the center of the sub-cover 4, so that the cable 3 can pull the high-pressure piston 2 along the axial direction of the high-pressure cylinder 1, and the high-pressure piston can avoid bearing too large a radial force and rubbing the inner wall of the high-pressure cylinder hole. Similarly, the pulley II 9 is fixed at a position offset by half the diameter of the pulley from the center of the main cover 11, so that the cable 3 can pull the low-pressure piston 13 along the axial direction of the tank body 12.

[0033] The self-pressurized oil tank further comprises an oil level mechanical indication cover, the surface of the indication cover is engraved with an oil level scale, the middle part is a concave groove, the indication cover is installed above the cable 3 between the pulley I 6 and the pulley II 9, the surface of the cable is printed with a black indication line, the position of the cable scale line is observed through the gap of the concave groove, the corresponding indication cover oil level scale is read out, and then the oil liquid capacity in the tank body is visually observed.

[0034] The main cover 11 is provided with a low liquid level alarm switch.

[0035] The oil tank 12 is provided with an oil leakage collecting joint 15 near the rear cover 14.

[0036] The rear cover 14 is provided with an air filter screen.

[0037] The third embodiment is as follows: The self-pressurizing oil tank provided by the embodiment of the application is a cable type pressurized self-pressurizing oil tank, the high-pressure cylinder is arranged on the side of the tank body, the self-pressurizing function is realized through the cable, the length of the oil tank in the axial direction is approximately equal to the length of the tank body, the length dimension is reduced by nearly half compared with the traditional oil tank, the installation space is maximally saved, the piston rod and other parts are saved, the weight is reduced, and the flight efficiency of the airplane is improved.

[0038] The oil tank connects the low-pressure piston and the high-pressure piston through the cable, and utilizes the constant force reversing principle of the fixed pulley to ensure that the forces borne by the low-pressure piston and the high-pressure piston are balanced (p low =p high s small / s large).

[0039] The self-pressurizing principle of the oil tank is as follows: the hydraulic pump of the hydraulic system works to output high-pressure oil, a small branch of the high-pressure oil output by the hydraulic pump is introduced into the high-pressure cylinder of the oil tank through the pressurizing pipe joint of the oil tank, the hydraulic pressure borne by the high-pressure piston is transmitted to the low-pressure piston through the cable, the low-pressure piston extrudes the oil in the tank body, and then the self-pressurizing function is realized, the pressure oil supplies the pump inlet with oil through the oil suction port of the oil tank, the low-pressure pressure can ensure that the hydraulic pump effectively sucks oil, and air suction is avoided. After the high-pressure oil at the outlet of the hydraulic pump is used by the hydraulic user, the high-pressure oil is collected to the system oil return oil way, and finally flows back to the oil tank through the oil return pipe joint of the oil tank.

[0040] Specifically, referring to Figure 1 The self-pressurizing oil tank provided by the embodiment of the application is a cable type pressurized self-pressurizing oil tank, which comprises a high-pressure cylinder 1, a high-pressure piston 2, a cable 3, a vice cover 4, a pressurizing pipe joint 5, a pulley I 6, an exhaust pipe joint 7, an oil return pipe joint 8, a pulley II 9, an oil suction pipe joint 10, a main cover 11, a tank body 12, a low-pressure piston 13 and a rear cover 14.

[0041] The main cover 11 and the rear cover 14 are respectively fixed at two ends of the tank body 12; The vice cover 4 is fixed at the bottom of the high-pressure cylinder 1; The high-pressure cylinder 1 is arranged in the axial direction of the tank body 12, is fixed to the main cover 11 on one side through the vice cover 4, and is directly fixed to the rear cover 14 on the other side, and the diameter of the high-pressure cylinder 1 is smaller than the diameter of the tank body 12; The high-pressure piston 2 and the low-pressure piston 13 are fixed to two ends of the cable 3 and reciprocate in the high-pressure cylinder 1 and the tank body 12 respectively; The pulley I 6 is fixed to the vice cover 4, and the pulley II 9 is fixed to the main cover 11, so as to change the force direction of the cable 3; The pressurizing pipe joint 5 is fixed to the vice cover 4 and communicates with a high-pressure cavity composed of the high-pressure piston 2 and the high-pressure cylinder 1. The exhaust pipe joint 7, the oil return pipe joint 8 and the oil suction pipe joint 10 are fixed to the main cover 5 and pass into the tank body.

[0042] Please see Figure 1 , the self-pressurized tank further comprises a high-pressure cylinder 1, a high-pressure piston 2, a cable 3, a sub-cover 4, a pressurizing pipe joint 5, a pulley I 6, an exhaust pipe joint 7, an oil return pipe joint 8, a pulley II 9, an oil suction pipe joint 10, a main cover 11, a tank body 12, a low-pressure piston 13, a rear cover 14, an oil leakage collection joint 15 and a dustproof cover 16. The main cover 11 and the rear cover 14 are respectively fixed at the bottom of the tank body 12; the sub-cover 4 is fixed at the bottom of the high-pressure cylinder 1; the high-pressure cylinder 1 is arranged along the axial direction of the tank body 12, is fixed to the main cover 11 on one side through the sub-cover 4 and is directly fixed to the rear cover 14 on the other side, and the diameter of the high-pressure cylinder 1 is smaller than the diameter of the tank body 12; the high-pressure piston 2 and the low-pressure piston 13 are fixed to the two ends of the cable 3 and reciprocate in the high-pressure cylinder 1 and the tank body 12 respectively; the pulley I 6 is fixed to the sub-cover 4 and the pulley II 9 is fixed to the main cover 11, so as to change the force direction of the cable 3; the pressurizing pipe joint 5 is fixed to the sub-cover 4 and communicates with the high-pressure cavity composed of the high-pressure piston 2 and the high-pressure cylinder 1; the exhaust pipe joint 7, the oil return pipe joint 8 and the oil suction pipe joint 10 are fixed to the main cover 5 and pass into the tank body.

[0043] Two fixing installation holes are respectively arranged on the main cover 11 and the rear cover 14, which are used for installation and fixation of the tank on a fixed plane; the dustproof cover 16 is installed at the tail end of the high-pressure cylinder 1, so as to prevent excess substances from falling into the air cavity of the high-pressure cylinder.

[0044] The pulley I 6 is fixed at a position offset from the center of the sub-cover 4 by half the diameter of the pulley, so that the cable 3 can pull the high-pressure piston 2 along the axial direction of the high-pressure cylinder 1, and the high-pressure piston can avoid bearing excessive radial force and rubbing the inner wall of the high-pressure cylinder hole; similarly, the pulley II 9 is fixed at a position offset from the center of the main cover 11 by half the diameter of the pulley, so that the cable 3 can pull the low-pressure piston 13 along the axial direction of the tank body 12.

[0045] The self-pressurized tank further comprises an oil level mechanical indication cover, the surface of the indication cover is marked with an oil level scale, the middle part is a concave groove, the indication cover is installed above the cable 3 between the pulley I 6 and the pulley II 9, the surface of the cable is marked with a black indication line, the position of the cable scale line is observed through the gap of the concave groove, the corresponding indication cover oil level scale is read out, and then the oil liquid capacity in the tank body is visually observed.

[0046] A low liquid level alarm switch is arranged on the main cover 11, a contact rod is inserted into the tank body through the main cover, when the oil liquid in the tank body is low, the low-pressure piston touches the contact rod, the low liquid level alarm switch is mechanically connected, a passage is formed, and the indicator light of the controller on the machine is turned on, so that the low liquid level alarm function is realized.

[0047] The oil leakage collecting joint 15 is arranged on the side of the tank body 12 close to the rear cover 14, and the low-pressure piston is movably sealed with the tank body. The low-pressure piston reciprocates for a long time, and some oil will accumulate in the air cavity of the tank body for years. The oil can be discharged through the oil leakage collecting joint.

[0048] The rear cover 13 is provided with an air filter screen. The low-pressure piston has a large cross-sectional area, and the gas in the air cavity needs to be discharged in time during reciprocation. Otherwise, the pressure in the air cavity will be blocked, which will hinder the movement of the piston. The air cavity of the tank body is connected to the atmosphere through the air filter screen, so that the exhaust is smooth, and on the other hand, it prevents excess material from entering the air cavity.

[0049] The exhaust pipe joint 7, the oil return pipe joint 8, and the oil suction pipe joint 10 are fixed to the main cover 5 and extend into the tank body. The exhaust pipe joint 7 is arranged at the uppermost part of the main cover, which is convenient for oil exhaust. The oil suction pipe joint 8 is arranged at the lowermost part of the tank body, which ensures that the oil gas content absorbed by the pump is the least. The oil return pipe joint 10 is arranged between the two.

[0050] The high-pressure cylinder 1 and the tank body 12 are both cylindrical structures. The auxiliary cover and the dust cover are fixed to the two sides of the high-pressure cylinder by threads or bolt fasteners. The main cover and the rear cover are fixed to the two sides of the tank body by threads or bolt fasteners. The auxiliary cover is fixed to the main cover by a thread fastener, and the dust cover is fixed to the rear cover by a cylindrical pin. Finally, the high-pressure cylinder is fixed to the circumferential side of the tank body.

[0051] The main cover, the low-pressure piston, and the high-pressure piston are disc-shaped parts. The cable is a rope-like part. The low-pressure piston has a small hole in the center. The cable passes through the small hole and enters the other end of the low-pressure piston. A steel chuck is sleeved on the end of the cable. The chuck is deformed by a press machine until it is pressed tightly against the steel cable. The diameter of the clamped cable is larger than the small hole, so that the cable is fixed to the low-pressure piston. The connection method of the high-pressure piston and the cable is the same.

[0052] The main cover also integrates an oil level mechanical indicator cover, which has an oil level indication function. The indicator cover is installed above the cable 3 between the pulley I 6 and the pulley II 9 and is fixed to the main cover by a thread fastener. The surface of the indicator cover is marked with an oil level scale, and the middle is a concave groove. The surface of the cable is marked with a black indicator line. The position of the cable marking line is observed through the gap of the concave groove, and the corresponding indicator cover oil level scale is read out, and then the oil capacity in the tank body is visually observed. This function is used to support the ground maintenance personnel to visually identify the oil level, which is convenient for monitoring the oil level and performing oil filling, oil draining and other operations.

[0053] A manual or automatic exhaust valve can be integrated at the rear end of the exhaust pipe joint for oil tank exhaust. The free gas in the hydraulic system will be separated out in the oil tank and accumulated at the top of the oil tank. The gas will cause the oil tank pressure to be unstable, and if mixed into the oil and sucked into the pump, it will also increase the probability of cavitation in the system, causing damage to the hydraulic pump.

[0054] The oil return pipe joint can be internally integrated with an oil return check valve, which is installed on the end face of the main cover by screwing or flange screw fastening, and can be selected as a spring type cone valve or a ball valve, and is installed on the system oil return pipeline, so as to effectively prevent the hydraulic system return oil from flowing back to the hydraulic system.

[0055] The above detailed description is a detailed description of the present application, which cannot be considered as limiting the specific embodiments of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions and substitutions can be made without departing from the concept of the present application, which shall be considered as belonging to the protection scope of the present application.

Claims

1. A self-pressurized tank pressurized by a cable, characterized by, The device comprises a high-pressure cylinder (1), a high-pressure piston (2), a box (12) and a low-pressure piston (13), the high-pressure cylinder (1) is arranged on one side of the box (12), the high-pressure cylinder (1) is provided with high-pressure medium, the box (12) is provided with low-pressure medium, the high-pressure piston (2) is arranged in the high-pressure cylinder (1) and can move horizontally, the low-pressure piston (13) is arranged in the box (12) and can move horizontally, the high-pressure piston (2) separates the cavities on both sides of the high-pressure cylinder (1), and the low-pressure piston (13) separates the cavities on both sides of the box (12); one end of the high-pressure piston (2) and the low-pressure piston (13) is connected through a pulley assembly, and the pulley assembly enables the movement of the high-pressure piston (2) or the low-pressure piston (13) to drive the movement of the other piston.

2. A self-pressurized fuel tank with cable-type pressurization according to claim 1, characterized in that The pulley assembly comprises a cable (3), a pulley I (6) and a pulley II (9), the cable (3) is connected to the high-pressure piston (2) and the low-pressure piston (13) at two ends, the cable (3) is bent by 90° under the joint action of the pulley I (6) and the pulley II (9), and the cable (3) is connected to the high-pressure piston (2) and the low-pressure piston (13) in parallel.

3. A self-pressurized fuel tank with cable-type pressurization according to claim 2, characterized in that, A main cover (11) is arranged on the right side of the box (1), the main cover (11) is provided with an exhaust pipe joint (7), an oil return pipe joint (8) and an oil suction pipe joint (10), and the cable (3) is arranged on the right side of the low-pressure piston (13) and passes out from the main cover (11); a sealing structure is arranged between the cable (3) and the main cover (11).

4. A self-pressurising tank of the type defined in claim 3, characterised in that, The high-pressure cylinder (1) is arranged in the axial direction of the box (12), the right end of the high-pressure cylinder (1) is fixedly connected to the main cover (11) through a secondary cover (4), the left end of the high-pressure cylinder (1) is flush with the left end of the box (1), and the cable (3) is arranged on the right side of the high-pressure piston (2) and passes out from the secondary cover (4); a sealing structure is arranged between the cable (3) and the secondary cover (4).

5. A self-pressurising tank of the type defined in claim 4, characterised in that, The pulley I (6) is fixed to the secondary cover (4) at a position offset by half the diameter of the pulley, so that the cable (3) can pull the high-pressure piston (2) in the axial direction of the high-pressure cylinder (1); the pulley II (9) is fixed to the main cover (11) at a position offset by half the diameter of the pulley, so that the cable (3) can pull the low-pressure piston (13) in the axial direction of the box (12).

6. A self-pressurized fuel tank with a cable-type pressure booster according to claim 4, characterized in that, The diameter of the high-pressure cylinder (1) is smaller than the diameter of the box (12).

7. A self-pressurized fuel tank with cable-type pressurization according to claim 4, characterized in that The secondary cover (4) is provided with a booster pipe joint (5).

8. A self-pressurized fuel tank with cable-type pressurization according to claim 3, characterized in that, The main cover (11) and the rear cover (14) installed at the left end of the box (12) are each provided with two fixed mounting holes for mounting and fixing the oil tank on a fixed plane, the dust cover (16) is installed at the left end of the high-pressure cylinder (1) to prevent foreign matters from falling into the high-pressure cylinder (1).

Images