阅读说明：本技术 一种稳压封闭油箱 (Voltage-stabilizing closed oil tank ) 是由 田中山 王丽然 杨昌群 蔡婧 牛道东 陈诗洋 李育特 郭继璇 于 2021-01-18 设计创作，主要内容包括：本发明公开了一种稳压封闭油箱,包括第一缸体、第二缸体和活塞组件；第一缸体的内腔与第二缸体的内腔相互独立；第一缸体内腔通过分隔板分割为第一储气腔和第二储气腔；第二缸体上设置有液压油进出口和排气孔；塞组件包括活塞杆和设置在活塞杆两端的第一活塞头和第二活塞头,第一活塞头设置在第一储气腔中,第二活塞头设置在第二缸体的内腔中,第一活塞头和第二活塞头能够在第一储气腔和第二缸体内同步移动。本发明将活塞杆的两端分别设置在其中一个储气腔和储油腔中,当储油腔中的液压油油位发生变化时,储气腔仅其中一个腔体积发生变化,从而使得整个储气腔体积变化较小,整个储气腔的压力变化也较小,进而实现稳压的功能。(The invention discloses a pressure-stabilizing closed oil tank which comprises a first cylinder body, a second cylinder body and a piston assembly, wherein the first cylinder body is connected with the second cylinder body through a piston rod; the inner cavity of the first cylinder body is independent from the inner cavity of the second cylinder body; the first cylinder inner cavity is divided into a first air storage cavity and a second air storage cavity through a partition plate; the second cylinder body is provided with a hydraulic oil inlet and outlet and an exhaust hole; the plug assembly comprises a piston rod and a first piston head and a second piston head arranged at two ends of the piston rod, wherein the first piston head is arranged in the first air storage cavity, the second piston head is arranged in the inner cavity of the second cylinder body, and the first piston head and the second piston head can synchronously move in the first air storage cavity and the second cylinder body. According to the invention, two ends of the piston rod are respectively arranged in one of the gas storage cavities and the oil storage cavity, and when the oil level of hydraulic oil in the oil storage cavity is changed, the volume of only one of the gas storage cavities is changed, so that the volume change of the whole gas storage cavity is smaller, the pressure change of the whole gas storage cavity is smaller, and the pressure stabilizing function is further realized.)

1. A pressure-stabilizing closed oil tank is characterized by comprising a first cylinder body (1), a second cylinder body (2) and a piston assembly (3);

the inner cavity of the first cylinder body (1) and the inner cavity of the second cylinder body (2) are mutually independent; a partition plate is arranged in the first cylinder body (1), the partition plate divides an inner cavity of the first cylinder body (1) into a first air storage cavity (15) and a second air storage cavity (16), and the first air storage cavity (15) is communicated with the second air storage cavity (16); the second cylinder body (2) is provided with a hydraulic oil inlet and outlet (25) and an exhaust hole (26);

the piston assembly (3) comprises a piston rod (31) and a first piston head (32) and a second piston head (33) which are arranged at two ends of the piston rod (31); the first piston head (32) is arranged in the first air storage cavity (15), the second piston head (33) is arranged in the inner cavity of the second cylinder body (2), and the first piston head (32) and the inner wall of the first air storage cavity (15) and the second piston head (33) and the inner wall of the second cylinder body (2) are sealed; the first piston head (32) and the second piston head (33) are synchronously movable within the first air reservoir (15) and the second cylinder (2).

2. A pressurizable closed fuel tank according to claim 1, wherein the first cylinder (1) comprises a closed end outer sleeve (11) and an inner sleeve (12) arranged in the outer sleeve (11), the inner sleeve (12) forming the partition, the interior of the inner sleeve (12) forming the first air reservoir (15), the space between the inner sleeve (12) and the outer sleeve (11) forming the second air reservoir (16); the first piston head (32) has an outer diameter that matches an inner diameter of the inner sleeve (12).

3. The tank according to claim 2, characterized in that the inner sleeve (12) has a wall provided with a vent hole (17), said vent hole (17) allowing the passage between the first reservoir (15) and the second reservoir (16).

4. The pressure-stabilizing closed oil tank as claimed in claim 2, characterized in that the closed end of the outer sleeve (11) is provided with an air charging and discharging port, and an air charging connector (18) is connected to the air charging and discharging port.

5. A pressure-stabilized closed fuel tank according to claim 1 or 2, characterized in that the cross-sectional area of the first air reservoir (15) accounts for 15% to 50% of the total air reservoir cross-sectional area within the first cylinder (1).

6. A pressure-stabilizing closed fuel tank according to claim 1, characterized in that the cross-sectional area of the inner cavity of the first cylinder (1) is smaller than the cross-sectional area of the inner cavity of the second cylinder (2).

7. The pressure-stabilizing closed oil tank as claimed in claim 1, wherein the second cylinder (2) comprises a cylinder (21) and a second end plate (22) and a third end plate (23) which are arranged at two ends of the cylinder (21), the second end plate (22) is connected with the first cylinder (1), and the second end plate (22) is provided with a through hole (24) for the piston rod (31) to move back and forth; the hydraulic oil inlet and outlet (25) is arranged on the third end plate (23), and the exhaust hole (26) is arranged on the cylinder barrel (21) close to the second end plate (22).

Technical Field

The invention belongs to the technical field of electro-hydraulic actuators, and particularly relates to a pressure-stabilizing closed oil tank which is used for charging, discharging and storing hydraulic oil in an electro-hydraulic actuator product.

Background

In order to solve the problem that the working medium oil of the electro-hydraulic actuator product is easy to oxidize when being contacted with air, a closed oil tank which can enable the working medium oil to generate certain pressure and is simultaneously isolated from the outside air is required to be designed for storing the working medium oil. In order to ensure that the product system of the electro-hydraulic actuator can work stably, the pressure fluctuation of the sealed oil tank is required to be as small as possible in the oil charging and discharging process.

The existing closed oil tank generally designs an oil tank body into a barrel-shaped structure, designs an oil tank cover into a piston-type structure, enables the oil tank cover to move up and down in the oil tank body, forms sealing between the oil tank cover and an oil tank barrel through a rubber ring, enables working medium oil to be isolated from outside air, and simultaneously adds a spring or seals compressed gas on the upper end of the oil tank cover to enable the working medium oil in the oil tank to generate certain pressure. This kind of closed oil tank makes working medium oil produce pressure because by spring or compressed gas, consequently can cause piston tank cap motion stroke great simultaneously when working medium oil mass change is great, and the change of spring or compressed gas's compressive capacity is big, and consequently the pressure change of working medium oil in the closed oil tank also can be great, and this is that hydraulic system does not wish to produce.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a pressure-stabilizing closed oil tank, which solves the problem that the pressure fluctuation of working medium oil is large in the oil charging and discharging process of the closed oil tank of the conventional electro-hydraulic actuator.

In order to solve the technical problems, the invention adopts the following technical scheme:

a pressure-stabilizing closed oil tank comprises a first cylinder body, a second cylinder body and a piston assembly; the inner cavity of the first cylinder body is independent from the inner cavity of the second cylinder body; a partition plate is arranged in the first cylinder body, the partition plate divides an inner cavity of the first cylinder body into a first air storage cavity and a second air storage cavity, and the first air storage cavity is communicated with the second air storage cavity; the second cylinder body is provided with a hydraulic oil inlet and outlet and an exhaust hole; the piston assembly comprises a piston rod and a first piston head and a second piston head which are arranged at two ends of the piston rod; the first piston head is arranged in the first air storage cavity, the second piston head is arranged in the inner cavity of the second cylinder body, and the first piston head and the inner wall of the first air storage cavity and the second piston head and the inner wall of the second cylinder body are sealed; the first piston head and the second piston head are capable of synchronous movement within the first air reservoir and the second cylinder.

Specifically, the first cylinder comprises an outer sleeve with a closed end and an inner sleeve arranged in the outer sleeve, the inner sleeve forms the partition plate, the first air storage cavity is formed inside the inner sleeve, and the second air storage cavity is formed at the interval between the inner sleeve and the outer sleeve; the first piston head has an outer diameter that matches an inner diameter of the inner sleeve.

Specifically, the inner sleeve wall is provided with a vent hole, and the vent hole enables the first air storage cavity and the second air storage cavity to be communicated.

Preferably, the closed end of the outer sleeve is provided with an air charging and discharging port, and the air charging and discharging port is connected with an air charging connector.

Preferably, the cross-sectional area of the first air storage cavity accounts for 15% -50% of the cross-sectional area of the whole air storage cavity in the first cylinder body.

Preferably, the cross-sectional area of the first cylinder inner cavity is smaller than the cross-sectional area of the second cylinder inner cavity.

Specifically, the second cylinder body comprises a cylinder barrel, and a second end plate and a third end plate which are arranged at two ends of the cylinder barrel, the second end plate is connected with the first cylinder body, and a through hole for the piston rod to move back and forth is formed in the second end plate; the hydraulic oil inlet and outlet are arranged on the third end plate, and the exhaust hole is formed in the cylinder barrel close to the second end plate.

Compared with the prior art, the invention has the beneficial effects that:

the closed oil tank structure of the invention utilizes the gas state equation principle and the force balance principle to divide the gas storage cavity into two cavities, the two ends of the piston rod are respectively arranged in one of the gas storage cavity and the oil storage cavity, when the oil level of hydraulic oil in the oil storage cavity changes, only one of the cavities of the gas storage cavity changes, thereby ensuring that the volume change of the whole gas storage cavity is smaller, the pressure change of the whole gas storage cavity is smaller, and further realizing the function of pressure stabilization.

Other effects and advantages of the present invention are described in detail in the detailed description.

Drawings

Fig. 1 is a schematic view of the overall structure of a pressure-stabilizing closed fuel tank according to an embodiment of the present invention.

Description of the various reference numbers in the drawings:

1-a first cylinder body, 2-a second cylinder body, 3-a piston assembly and 4-a sealing ring;

11-an outer sleeve, 12-an inner sleeve, 13-a first end cover, 14-an annular bulge, 15-a first air storage cavity, 16-a second air storage cavity, 17-a vent hole and 18-an air inflation joint;

21-a cylinder barrel, 22-a second end plate, 23-a third end plate, 24-a through hole, 25-a hydraulic oil inlet and outlet, 26-an exhaust hole and 27-a transition cavity;

31-piston rod, 32-first piston head, 33-second piston head.

Detailed Description

The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.

In the present invention, unless otherwise specified, the use of the terms of orientation such as "upper, lower, bottom, top" and "lower" generally refer to the definition in the drawing plane of the corresponding drawing, and "inner and outer" refer to the definition in the drawing plane of the corresponding drawing.

In the following description, unless otherwise expressly specified or limited, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally formed; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.

The invention discloses a pressure-stabilizing closed oil tank which comprises a first cylinder body 1, a second cylinder body 2 and a piston assembly 3. The inner cavity of the first cylinder body 1 is used for introducing gas, the inner cavity of the second cylinder body 2 is used for introducing hydraulic oil, and the inner cavity of the first cylinder body 1 and the inner cavity of the second cylinder body 2 are independent; and set up the division board in first cylinder body 1, this division board is divided into first gas storage chamber 15 and second gas storage chamber 16 with the inner chamber of first cylinder body 1, and link up between first gas storage chamber 15 and the second gas storage chamber 16 for the gas in first gas storage chamber 15 flows with the gas in the second gas storage chamber 16, and the intracavity of two gas storages is the same pressure.

The piston assembly 3 comprises a piston rod 31 and a first piston head 32 and a second piston head 33 which are arranged at two ends of the piston rod 31, the first piston head 32 is arranged in the first air storage cavity 15, the second piston head 33 is arranged in the inner cavity of the second cylinder body 2, the first piston head 32 and the inner wall of the first air storage cavity 15 are sealed, the second piston head 33 and the inner wall of the second cylinder body 2 are sealed, and the first piston head 32 and the second piston head 33 can synchronously move in the first air storage cavity 15 and the second cylinder body 2. In the embodiment of the invention, the first piston head 32 and the second piston head 33 are sealed by arranging the sealing rings 4, so that the first piston head 32 divides the inner cavity of the first air storage cavity 15 into two independent cavities during the movement, and the second piston head 33 also divides the inner cavity of the second cylinder 2 into two independent cavities during the movement.

The second cylinder body 2 is provided with a hydraulic oil inlet and outlet 25 and an exhaust hole 26, the hydraulic oil inlet and outlet 25 and the exhaust hole 26 are respectively arranged on the second cylinder body 2 at two ends of the second piston head 33 and are respectively used for introducing hydraulic oil into a cavity at one end of the second piston head 33 and discharging compressed gas in a cavity at the other end of the second piston head 33, specifically, the hydraulic oil enters the second cylinder body 2 through the hydraulic oil inlet and outlet 25 and pushes the second piston head 33 to move towards the direction close to the first cylinder body 1, the compressed gas in the cavity at the other side of the second piston head 33 is discharged from the exhaust hole 26, and meanwhile, the first piston head 32 compresses the gas in the first gas storage cavity 15. In addition, the inner cavity of the first cylinder body 1 is divided into an inner cavity and an outer cavity, when the oil level of hydraulic oil changes, only the volume of the first air storage cavity 15 changes, so that the volume change of the whole air storage cavity is small, the pressure change is small, and the pressure stabilizing function is further realized.

In addition, in the invention, the vent hole 26 is arranged above the first cylinder bottom 1, so that the inner cavity of the second cylinder body 2 above the second piston head 33 forms a transition cavity 27 communicated with the outside, and the transition cavity 27 separates the first air storage cavity 15 in the first cylinder body 1 from the oil storage cavity in the second cylinder body 2, thereby avoiding the risk that the gas filled in the first cylinder body 1 enters the hydraulic oil to damage the equipment.

As a specific embodiment of the present invention, as shown in fig. 1, the first cylinder 1 includes an outer sleeve 11 whose end is closed and an inner sleeve 12 disposed in the outer sleeve 11, the inner sleeve 12 forms a partition, the inside of the inner sleeve 12 forms the first air reservoir 15, the space between the inner sleeve 12 and the outer sleeve 11 forms the second air reservoir 16, and the outer diameter of the first piston head 32 matches the inner diameter of the inner sleeve 12 (i.e., the diameter of the first air reservoir 15).

As a specific embodiment of the invention, one end of the outer sleeve 11 is connected with a first end cap 13, the other end of the outer sleeve 11 is open, both ends of the inner sleeve 12 are open, a ring of annular protrusions 14 are arranged on the first end cap 13, the outer sleeve 11 is tightly attached to the outer ring of the annular protrusions 14, the inner sleeve 12 is inserted into the outer sleeve 11 and then tightly attached to the inner ring of the annular protrusions 14, and the first end cap 13 is fixed on the end surface of the outer sleeve 11 through bolts. The thickness of the annular protrusion 14 is the thickness of the space. In addition, a sealing ring 4 is arranged on the joint surface of the outer sleeve 11 and the outer ring of the annular bulge 14, and the inner cavity of the whole first cylinder body 1 is sealed.

In order to allow gas communication between the first gas reservoir 15 and the second gas reservoir 16, it is preferred according to the invention if a gas vent 17 is provided in the wall of the inner sleeve 12, which gas vent 17 is located in particular in the upper half of the inner sleeve 12.

In order to facilitate the introduction of gas into the first gas storage chamber 15, an air charging and discharging port (not shown) is provided at the closed end of the outer sleeve 11 (i.e., the first end cap 13), and an air charging connector 18 is mounted on the air charging and discharging port for sealing the air charging and discharging port. The gas entering the first gas storage chamber 15 in the present invention is preferably nitrogen.

As a specific embodiment of the present invention, as shown in fig. 1, the second cylinder 2 includes a cylinder 21, and a second end plate 22 and a third end plate 23 disposed at two ends of the cylinder 21, and specifically, the second end plate 22 and the third end plate 23 are both connected to two ends of the cylinder 21 by bolts. The second end plate 22 is connected to the first cylinder 1, and in particular, the free ends of the outer sleeve 11 and the inner sleeve 12 are welded to the upper surface of the second end plate 22. The second end plate 22 is provided with a through hole 24 for the piston rod 31 to move back and forth, the through hole 24 communicates the first air storage cavity 15 in the first cylinder 1 and the inner cavity of the second cylinder 2, specifically, the through hole 24 is located at the center of the second end plate 22, and the hydraulic oil inlet and outlet 25 is arranged on the third end plate 23, specifically, located at the center of the third end plate 23. The exhaust port 26 is opened in the cylinder 21 near the second end plate 22.

As a specific embodiment of the present invention, the end face of the first piston head 32 connected to the piston rod 31 and the end face of the second piston head 33 connected to the piston rod 31 are both provided with an inwardly concave groove, and the piston rod 31 is connected to the bottom of the groove by a bolt or integrally formed with the bottom of the groove.

As a specific embodiment of the present invention, the first piston head 32 and the second piston head 33 are both cylindrical structures. A circle of groove for installing the sealing ring 4 is arranged on the outer diameter surface of the cylinder.

As a preferable aspect of the above-described embodiment of the present invention, the cross-sectional area of the first air reservoir 15 (i.e., the end surface area of the first piston head 32) accounts for 15% to 50% of the entire cross-sectional area of the air reservoir in the first cylinder 1 (i.e., the entire cross-sectional area of the first air reservoir 15 and the second air reservoir 16). The moving direction of the piston rod 31 is defined as an axial direction in the present invention, and a section perpendicular to the moving direction of the piston rod 31 is defined as a cross section.

As a preferable scheme of the above embodiment of the invention, the cross-sectional area of the inner cavity of the first cylinder 1 is smaller than that of the inner cavity of the second cylinder 2, so that the cross-sectional area occupation ratio of the first air storage cavity 15 is smaller, and the volume fluctuation of the air storage cavity is further small.

The voltage stabilizing principle of the voltage stabilizing closed mailbox is as follows:

according to the pressure requirement of the system, firstly, nitrogen with certain pressure is filled into the first air storage cavity 15 through the air charging and discharging port, the air charging and discharging port is closed through the air charging connector 18, and the nitrogen is sealed in the first cylinder body 1. Since the first piston head 32 of the piston rod 31 is located inside the first air reservoir 15 and is subjected to the downward pressure of the nitrogen gas, the piston rod 31 brings the entire piston assembly 3 down and presses against the second piston head 33. When the oil storage cavity of the pressure-stabilizing closed oil tank (namely the inner cavity of the second cylinder body 2) is filled with hydraulic oil through the hydraulic oil inlet and outlet 25 at the lower end, the hydraulic oil pushes the second piston head 33 to drive the piston rod 31 to move upwards against the nitrogen pressure, meanwhile, the hydraulic oil pushes the load to generate pressure, and according to the force balance principle, the hydraulic oil pressure value is equal to the ratio of the nitrogen pressure divided by the area of the end face of the second piston head 33 to the area of the end face of the first piston head 32. Since the area of the end face of the second piston head 33 is larger than that of the end face of the first piston head 32, the ratio of the area of the end face of the second piston head 33 to that of the end face of the first piston head 32 is a positive number greater than 1, and therefore the hydraulic oil pressure is smaller than the nitrogen pressure. Meanwhile, the proportion of the area of the end face of the first piston head 32 to the total section of the air storage cavity is small, so that the volume change of the whole air storage cavity is small along with the rise of the oil level of hydraulic oil, the pressure change of the air storage cavity is small, the pressure change of the hydraulic oil is small, and the pressure stabilizing function is realized.

The respective specific technical features described in the above-described embodiments may be combined in any suitable manner without contradiction as long as they do not depart from the gist of the present invention, and should also be regarded as being disclosed in the present invention.