Hydraulically controlled pressure oil tank

Abstract

The utility model discloses a hydraulically-controlled pressure oil tank which comprises an oil tank shell, a piston, an oil cylinder and a control assembly. The piston can move in the inner cavity and divides the inner cavity into an oil liquid cavity and a gas cavity, an oil suction port and an oil return port are formed in the oil tank shell, and the oil return port is communicated with the oil suction port through the oil liquid cavity; the side, close to the oil cavity, of the piston is an oil side, the side, close to the gas cavity, of the piston is a gas side, and the control assembly is used for controlling actions of the oil cylinder to drive the piston to move towards the oil side or the gas side so as to reduce or increase the volume of the oil cavity. The oil cylinder and the control assembly are arranged, the control assembly is used for controlling the action of the oil cylinder, the oil cylinder can drive the piston to move in the inner cavity so as to adjust the volume of the oil liquid cavity, the effect of preventing the oil tank from generating negative pressure and overpressure is achieved, and the situation that an oil pump sucks air and the service life is shortened is avoided.

Description

Technical Field

[0001] The utility model relates to a pressure oil tank controlled by hydraulic pressure. Background Art

[0002] In a hydraulic system, the usually used oil tank is horizontally static, so that the oil tank can communicate directly with the atmosphere. When the oil tank is in a rotating and tumbling working condition, there cannot be an oil port communicating directly with the atmosphere at this time to avoid oil spillage. The oil tank can be closed, but when the oil pump sucks oil, the volume of the closed oil tank must be allowed to decrease to avoid the oil pump sucking air or the pressure of the oil suction pipeline of the oil pump being too low, resulting in a decrease in the service life of the oil pump. Therefore, in order to cooperate with the oil pump to suck oil and the corresponding oil return, the oil tank is required to be able to change its volume while being closed. Content of the Utility Model

[0003] According to one aspect of the utility model, there is provided a pressure oil tank controlled by hydraulic pressure, comprising:

[0004] An oil tank housing having an inner cavity;

[0005] A piston movable in the inner cavity and separating the inner cavity into an oil chamber and a gas chamber, an oil suction port and an oil return port are provided on the oil tank housing, and the oil return port communicates with the oil suction port through the oil chamber;

[0006] An oil cylinder and a control assembly, one side of the piston close to the oil chamber is the oil side, and one side of the piston close to the gas chamber is the gas side. The control assembly is used to control the action of the oil cylinder to drive the piston to move towards the oil side or the gas side to reduce or increase the volume of the oil chamber.

[0007] For the pressure oil tank controlled by hydraulic pressure of the utility model, by providing an oil cylinder and a control assembly, and using the control assembly to control the action of the oil cylinder, when the oil pump sucks oil, the oil cylinder can drive the piston to move towards the oil side to reduce the volume of the oil chamber, prevent the oil tank from generating negative pressure, and further avoid the oil pump sucking air; when the oil tank returns oil, the oil cylinder can make the piston move towards the gas side to increase the volume of the oil chamber, prevent the oil tank from overpressuring, and thus avoid the decrease in the service life of the oil pump.

[0008] In some embodiments, the control assembly includes a pressure reducing valve and a relief valve. The pressure reducing valve is used to make the oil cylinder drive the piston to move towards the oil side to reduce the volume of the oil chamber, and the relief valve is used to control the piston to move towards the gas side to increase the volume of the oil chamber so that the oil enters the oil chamber from the oil return port.

[0009] In some embodiments, the control assembly further includes a check valve, and the check valve is respectively connected to the pressure reducing valve and the oil suction port.

[0010] In some embodiments, the control assembly further includes a safety valve, and the safety valve is connected to the relief valve.

[0011] In some embodiments, a pressure relay is connected to the oil chamber.

[0012] In some embodiments, a pressure sensor is connected to the oil chamber.

[0013] In some embodiments, a temperature sensor is connected to the oil chamber.

[0014] In some embodiments, a partition for separating the oil suction port and the oil return port is provided in the oil chamber.

[0015] In some embodiments, a ventilation pipe is further included. An air vent is provided on the fuel tank housing, the air vent communicates with the gas chamber, and the ventilation pipe is installed in the air vent to communicate with the gas chamber.

[0016] In some embodiments, a sealing ring is provided between the piston and the fuel tank housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 One of the perspective views of the pressure fuel tank with hydraulic control of the present utility model;

[0018] Figure 2 Another perspective view of the pressure fuel tank with hydraulic control of the present utility model;

[0019] Figure 3 A cross-sectional view of the pressure fuel tank with hydraulic control of the present utility model;

[0020] Figure 4 A third perspective view of the pressure fuel tank with hydraulic control of the present utility model;

[0021] Figure 5 A side view of the pressure fuel tank with hydraulic control of the present utility model;

[0022] Figure 6 A structural schematic diagram of the pressure fuel tank with hydraulic control of the present utility model.

[0023] In the figure: 10, fuel tank housing; 11, piston; 12, oil chamber; 13, gas chamber; 14, oil cylinder; 15, pressure reducing valve; 16, overflow valve; 17, check valve; 18, safety valve; 19, pressure relay; 20, sealing ring; 21, oil side groove; 22, gas side groove; 23, piston rod; 24, oil suction port; 25, oil return port; 26, displacement sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the present utility model in detail with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0026] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0029] Please refer to Figure 1 、 4, 5, 6, this embodiment provides a pressure oil tank controlled hydraulically, which does not require an additional hydraulic pump station to maintain pressure. Only a pressure oil source greater than a certain set value needs to be provided by the hydraulic system of this pressure oil tank, and it can be used in hydraulic systems with different volumes and pressures. It can effectively solve the problems of oil leakage from the oil tank under the working conditions of rotation and tumbling, and the easy cavitation of the oil pump during oil suction. The pressure oil tank includes an oil tank housing 10, a piston 11, an oil cylinder 14 and a control component. The oil tank housing 10 is a closed housing that does not communicate with the atmosphere and has an inner cavity; please refer to Figure 5 , the piston 11 can move in the inner cavity and divide the inner cavity into an oil chamber 12 and a gas chamber 13. An oil suction port (S port) 24 and an oil return port (R port) 25 are provided on the oil tank housing 10. The oil return port 25 is communicated with the oil suction port 24 through the oil chamber 12; the side of the piston 11 close to the oil chamber 12 is the oil side, and the side of the piston 11 close to the gas chamber 13 is the gas side. The control component is used to control the action of the oil cylinder 14 to drive the piston 11 to move in the oil side or gas side direction to reduce or increase the volume of the oil chamber 12, and can limit the maximum and minimum pressures of the oil tank.

[0030] On the basis of the above structure, please refer to Figure 1 , 4 , 5, 6, the pressure oil tank is hydraulically controlled through the cooperation of the oil cylinder 14 and the control component. By using the control component to control the action of the oil cylinder 14, when the oil pump sucks oil, the oil cylinder 14 can drive the piston 11 to move in the oil side direction to reduce the volume of the oil chamber 12, prevent the pressure oil tank from generating negative pressure, and thus avoid the cavitation of the oil pump; when the oil tank returns oil, the oil cylinder 14 can make the piston 11 move in the gas side direction to increase the volume of the oil chamber 12, prevent the oil tank from overpressurizing, and thus avoid the reduction of the service life of the oil pump.

[0031] Please refer to Figure 3 , 5, 6. A piston rod 23 is arranged inside the cylinder body of the oil cylinder 14. The piston rod 23 divides the internal space of the oil cylinder 14 into a rodless chamber and a rod chamber. Since the diameter of the cylindrical oil tank housing 10 of the pressure oil tank is much larger than the cylinder diameter of the oil cylinder 14, the area ratio is quite large. In this way, the piston 11 and the piston rod 23 can reach equilibrium under the new pressure. The control assembly includes a pressure reducing valve 15 and a relief valve 16. The input end of the pressure reducing valve 15 is connected to the oil suction port 24, and the output end of the pressure reducing valve 15 is connected to the rodless chamber of the oil cylinder 14. When the oil pump sucks oil through the oil suction port 24, it will cause the pressure to drop. Assume that the pressure P2 in the rodless chamber of the control oil cylinder 14 is between 72.5 - 109 bar. When the pressure P1 of the pressure oil tank drops by 0.3 bar, the pressure P2 of the control oil cylinder 14 will drop by 21.75 bar. This pressure will cause the pressure reducing valve 15 to open, so that the pressure oil from the hydraulic system pushes the piston rod 23 inside the oil cylinder 14 to extend, and pushes the piston 11 inside the oil tank housing 10 to move, pushing the oil to be output to the oil suction port 24, which can push the oil cylinder 14 and further move the piston 11 towards the oil side to keep the pressure of the pressure oil tank from generating negative pressure. The input end of the relief valve 16 is connected to the rodless chamber of the oil cylinder 14, and the output end of the relief valve 16 is respectively connected to the oil chamber 12 of the oil tank housing 10 and the rod chamber of the oil cylinder 14. When the hydraulic system returns oil through the oil return port 25, it will cause the pressure of the pressure oil tank to rise. The pressure in the rodless chamber of the control oil cylinder 14 will rise accordingly, and finally cause the relief valve 16 to open for overflow. The piston 11 inside the oil tank housing 10 and the piston rod 23 inside the oil cylinder 14 both move to the right, so that the pressure oil tank will not be over-pressurized. This high pressure is determined by the set pressure of the relief valve 16, and this pressure value will be maintained until the hydraulic system oil pump starts; the pressure reducing valve 15 is used to drive the piston 11 of the oil cylinder 14 to move towards the oil side to reduce the volume of the oil chamber 12, and the relief valve 16 is used for the oil tank to return oil. When the volume of the oil tank increases, to maintain the pressure of the oil tank and ensure that it does not exceed the specified pressure value, the oil cylinder 14 is forced to yield, so that the piston 11 moves towards the gas side to increase the volume of the oil chamber 12. That is, the movement of the piston 11 towards the gas side is driven by the oil tank returning oil. The relief valve 16 only controls the pressure of the control oil cylinder 14. One is to maintain the pressure of the oil tank not lower than a certain value to ensure that there will be no negative pressure during the next oil suction; the other is to prevent the pressure reducing valve 15 from being directly connected to the oil tank and getting out of control.

[0032] For specific implementation, please refer to Figures 1-6, the oil cylinder 14 is a detachable structure, which is convenient for maintenance. In this embodiment, the oil cylinder 14 is used to push the piston 11 (when the oil tank discharges oil), and the space around the oil cylinder 14 can be utilized, thereby reducing the overall volume of the oil tank. In addition, a displacement sensor 26 can be assembled on the oil cylinder 14. The displacement sensor 26 can be installed on the air-side end cover (such as using a laser distance sensor or an ultrasonic distance sensor), or can be built into the oil cylinder 14 (such as using a magnetostrictive displacement sensor); the displacement sensor 26 enables the control system to detect the position of the piston 11. If there is an abnormality, it can alarm, stop the machine, etc. (for example, in the same state, if the sensor has different position readings, this will indicate that there is a leak in the oil tank or gas has entered the oil).

[0033] Please refer to Figure 6 , the control component further includes a check valve 17. The input end of the check valve 17 is connected to the oil suction port 24, and the output end of the check valve 17 is connected to the input end of the pressure reducing valve 15. Thus, the check valve 17 is used to prevent the oil in the rodless cavity of the oil cylinder 14 from leaking under the action of the weight of the oil in the oil tank and the weight of the piston 11 when the pressure oil tank stops when the oil cylinder 14 is below and the oil tank is above, which may cause the piston 11 to slide down. The sliding down of the piston 11 at this time will cause a low pressure in the oil tank and cause the gas that may be contained in the oil to precipitate and generate bubbles. That is, the check valve 17 can effectively maintain the pressure of the pressure oil tank, thereby preventing the hydraulic system of the pressure oil tank from losing pressure or stopping for a certain period of time.

[0034] Please refer to Figure 5 , 6 , the control component further includes a safety valve 18. The input end of the safety valve 18 is connected to the input end of the relief valve 16, and the output end of the safety valve 18 is connected to the output end of the relief valve 16. Under the action of the safety valve 18, it can be ensured that the pressure of the pressure oil tank does not exceed the allowable pressure when the relief valve 16 fails to open correctly.

[0035] Please refer to Figure 6 , the oil chamber 12 is connected with a pressure relay 19, which can protect the pressure oil tank from problems due to faults.

[0036] Please refer to Figure 6 , a pressure sensor is provided on the oil tank housing 10, and the oil chamber 12 is connected to the pressure sensor. In this way, the pressure in the oil chamber 12 can be effectively detected, which is beneficial to realizing automatic constant pressure control and can also be used as a signal for alarming or taking appropriate actions. For example, once the pressure is too high or too low, the upper control system can react in a timely manner.

[0037] Please refer to Figure 6, a temperature sensor is provided on the fuel tank housing 10, connecting the oil chamber 12 with the temperature sensor. In this way, the temperature inside the oil chamber 12 can be effectively detected, and signals can be used for alarm or taking appropriate actions. For example, once the temperature is too high or too low, the upper control system can react in time.

[0038] Please refer to Figures 1-4 , a partition for separating the oil suction port 24 and the oil return port 25 is provided inside the oil chamber 12 of the fuel tank housing 10. An oil-side groove 21 is provided on the oil side of the piston 11, so that when the piston 11 moves to the partition, it can avoid through the oil-side groove 21, and at the same time, it is also beneficial to increase the oil storage volume. Specifically, the shape of the partition is preferably strip-shaped, which is convenient for manufacturing.

[0039] Please refer to Figures 1-4 , the pressure fuel tank further includes a ventilation pipe. A ventilation port is provided on the fuel tank housing 10, and the ventilation port is communicated with the gas chamber 13. The ventilation pipe is installed in the ventilation port and communicated with the gas chamber 13. An air-side groove 22 is provided on the air side of the piston 11, so that when the piston 11 moves to the ventilation pipe, the ventilation pipe can be received in the air-side groove 22. In this way, the piston 11 can effectively avoid the ventilation pipe to reach both ends of the fuel tank housing 10. In the fuel tank housing 10, the gas chamber 13 in its inner cavity is connected to the atmosphere through an air filter, and the air in the gas chamber 13 can be effectively filtered. The inner cavity is closed at both ends of the fuel tank housing 10 through an air-side end cover and an oil-side end cover respectively. The ventilation pipe can be higher than the surface of the air-side end cover, so that the oil film on the inner surface of the cylinder of the air-side end cover surface will not enter the air filter (which has a moisture absorption function and will lose its function when encountering oil), and overflow from the fuel tank.

[0040] Please refer to Figure 3 , the oil-side groove 21 and the air-side groove 22 provided on both sides of the piston 11 can relatively increase the width of the piston 11, thereby increasing the stability of the movement of the piston 11.

[0041] Please refer to Figure 3 , a sealing ring 20 is provided between the piston 11 and the fuel tank housing 10, thereby improving the sealing performance of the oil chamber 12 and the gas chamber 13.

[0042] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Hydraulically controlled pressure oil tank, characterized in that: include: A fuel tank housing having an inner cavity; A piston is movable in the inner cavity and divides the inner cavity into an oil cavity and a gas cavity. An oil suction port and an oil return port are provided on the oil tank housing. The oil return port is connected with the oil suction port through the oil cavity. The oil cylinder and the control component, the side of the piston close to the oil chamber is the oil side, the side of the piston close to the gas chamber is the gas side, and the control component is used to control the action of the oil cylinder and drive the piston to move toward the oil side or the gas side to reduce or increase the volume of the oil chamber.

2. The hydraulically controlled pressure oil tank according to claim 1, characterized in that: The control component includes a pressure reducing valve and a relief valve. The pressure reducing valve is used to drive the oil cylinder to move the piston toward the oil side to reduce the volume of the oil chamber. The relief valve is used to control the piston to move toward the gas side to increase the volume of the oil chamber so that the oil enters the oil chamber from the oil return port.

3. The hydraulically controlled pressure oil tank according to claim 2, characterized in that: The control component also includes a one-way valve, which is connected to the pressure reducing valve and the oil suction port respectively.

4. The hydraulically controlled pressure oil tank according to claim 2, characterized in that: The control assembly also includes a safety valve, which is connected to the overflow valve.

5. The hydraulically controlled pressure oil tank according to any one of claims 1 to 4, characterized in that: The oil chamber is connected with a pressure relay.

6. The hydraulically controlled pressure oil tank according to any one of claims 1 to 4, characterized in that: The oil chamber is connected with a pressure sensor.

7. The hydraulically controlled pressure oil tank according to any one of claims 1 to 4, characterized in that: The oil chamber is connected with a temperature sensor.

8. The hydraulically controlled pressure oil tank according to claim 1, characterized in that: A partition plate for separating the oil suction port and the oil return port is arranged in the oil cavity.

9. The hydraulically controlled pressure oil tank according to claim 1, characterized in that: It also includes a vent pipe. The oil tank shell is provided with a vent port, the vent port is communicated with the gas cavity, and the vent pipe is installed in the vent port and communicated with the gas cavity.

10. The hydraulically controlled pressure oil tank according to claim 1, characterized in that: A sealing ring is arranged between the piston and the oil tank housing.

Images