Oil supplementing system for oil suction pipeline of hydraulic pump and walking mechanical equipment

Abstract

The invention relates to the technical field of walking machinery, and particularly discloses a hydraulic pump oil suction pipeline oil supplementing system and walking mechanical equipment.The hydraulic pump oil suction pipeline oil supplementing system comprises an oil tank, an oil pumping module and an oil supplementing module, the oil pumping module comprises a pump set and an oil suction pipe, an oil suction opening of the pump set is communicated with the oil suction pipe, and one end of the oil suction pipe is communicated with the oil tank; the pump set is used for being connected with a PTO port of a prime motor of walking mechanical equipment. The oil supplementing module comprises an electric pump and a first adjusting valve, an oil suction port of the electric pump communicates with the oil tank, a first port of the first adjusting valve communicates with an oil outlet of the electric pump, a second port of the first adjusting valve communicates with the other end of the oil suction pipe, and the first adjusting valve controls connection and disconnection of the first port and the second port. The system can supplement oil for the oil suction pipe so as to relieve the problem that the negative pressure value of the oil suction pipe is low, meanwhile, air in the oil suction pipe can be exhausted before a prime motor is started, and the problems of abnormal sound, function loss and abnormal abrasion of a pump are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of walking machinery, and in particular to an oil replenishing system for a hydraulic pump oil suction pipeline and walking machinery equipment. Background Art

[0002] For some new energy walking machinery, such as extended-range loaders, extended-range tractors and other products, the hydraulic pump of the hydraulic system needs to be connected to the PTO port of the prime mover. Therefore, the layout of the hydraulic pump is restricted by the PTO port of the prime mover. The hydraulic pump cannot be arranged below the oil tank level. At the same time, the oil suction pipeline of the hydraulic pump is long. At this time, the following problems will occur:

[0003] 1. At the initial start-up of walking machinery in winter, the hydraulic oil temperature is low and the viscosity is high. At this time, the hydraulic pump oil suction conditions are poor, which can easily cause a low negative pressure value in the oil suction pipeline, resulting in abnormal noise, low efficiency, and abnormal wear of the hydraulic pump.

[0004] 2. Due to the limited layout of the hydraulic pumps of some new energy models, the main pump cannot be placed below the liquid level of the hydraulic oil tank. When the vehicle is left for a long time, a small amount of air may enter the suction pipe of the hydraulic pump, causing the liquid level in the suction pipe to drop. At this time, when the vehicle is started, the hydraulic pump will inhale air, causing abnormal noise, loss of function and abnormal wear of the pump.

[0005] Therefore, there is an urgent need for a hydraulic pump oil suction pipeline oil replenishing system and walking mechanical equipment to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic pump suction pipeline oil replenishing system and a walking mechanical equipment to solve the problems in the related technology that the hydraulic oil temperature is too low, resulting in a low negative pressure value in the hydraulic pump suction pipeline, and because the hydraulic pump layout of some new energy models is limited, the main pump cannot be arranged below the hydraulic oil tank liquid level. When the whole vehicle is left for a long time, a small amount of air may enter the hydraulic pump suction pipe. When the whole vehicle is started, the hydraulic pump will inhale air, thereby causing abnormal noise, loss of function and abnormal wear of the pump.

[0007] In one aspect, the present invention provides a hydraulic pump oil suction pipeline oil replenishing system, the hydraulic pump oil suction pipeline oil replenishing system comprising:

[0008] tank;

[0009] An oil pump module, comprising a pump group and an oil suction pipe, wherein the oil suction port of the pump group is connected to the oil suction pipe, one end of the oil suction pipe is connected to the oil tank, and the pump group is used to be connected to the PTO port of the prime mover of the walking mechanical equipment;

[0010] The oil replenishing module includes an electric pump and a first regulating valve, wherein the oil suction port of the electric pump is connected to the oil tank, the oil outlet of the electric pump is connected to the first port of the first regulating valve, the second port of the first regulating valve is connected to the other end of the oil suction pipe, and the first regulating valve can control the opening and closing of the first port and the second port.

[0011] As an optimal technical solution for the hydraulic pump oil suction pipeline oil replenishment system, the oil pump module also includes a filter element and an exhaust pipe group. The filter element is connected in series to the portion of the oil suction pipe located between the oil tank and the oil suction port of the pump group. The oil suction pipe between the filter element and the pump group is connected to the inlet end of the exhaust pipe group, and the outlet end of the exhaust pipe group is connected to the oil tank. The exhaust pipe group includes a first state and a second state. In the first state, the inlet end and the outlet end of the exhaust pipe group are connected. In the second state, the inlet end of the exhaust pipe group and the outlet end of the exhaust pipe group are disconnected, or the inlet end of the exhaust pipe group is unidirectionally connected to the outlet end of the exhaust pipe group.

[0012] As an optimal technical solution for the hydraulic pump suction pipeline oil replenishment system, the exhaust pipe group includes an exhaust pipe and a second regulating valve, the suction pipe between the filter element and the pump group is connected to the inlet end of the exhaust pipe, the outlet end of the exhaust pipe is connected to the oil tank, the second regulating valve is connected in series to the exhaust pipe, and the second regulating valve includes a first position a and a second position a. In the first position a, the exhaust pipe group is in the first state, and in the second position a, the exhaust pipe group is in the second state.

[0013] As a preferred technical solution for the oil replenishment system of the hydraulic pump suction pipeline, the height of the second regulating valve from the ground is greater than the maximum height of the suction pipe from the ground.

[0014] As an optimal technical solution for the hydraulic pump suction pipeline oil replenishing system, the first regulating valve also includes a third port, and the third port is used to communicate with the hydraulic oil radiator of the walking machinery equipment. The first regulating valve includes a first position b and a second position b. At the first position b, the first port is connected to the second port, and at the second position b, the first port is connected to the third port.

[0015] As a preferred technical solution for the oil replenishment system of the hydraulic pump suction pipeline, the second port is configured as a damping hole.

[0016] As a preferred technical solution for the hydraulic pump suction pipeline oil replenishment system, the maximum height of the electric pump from the ground is less than the height of the liquid level of the oil tank from the ground.

[0017] As a preferred technical solution of the oil replenishment system for the hydraulic pump suction pipeline, the oil replenishment module further includes an overflow valve, and the overflow valve is connected in parallel with the electric pump.

[0018] As a preferred technical solution for the oil replenishment system of the hydraulic pump suction pipeline, the pump group includes a plurality of hydraulic pumps, and the oil suction ports of the plurality of hydraulic pumps are connected to the oil suction pipe.

[0019] On the other hand, the present invention provides a walking mechanical device, including the hydraulic pump suction pipeline oil replenishing system in any of the above schemes.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a hydraulic pump oil suction pipeline oil replenishment system and a walking mechanical device. When the walking mechanical device is working, the prime mover PTO port of the walking mechanical device drives the pump group to work, and then extracts the oil in the oil tank through the oil suction pipe, and then provides high-pressure oil to the hydraulic execution module of the walking mechanical device. When the hydraulic oil temperature is low, the viscosity of the hydraulic oil is high. At this time, the hydraulic pump oil suction condition is not good, which easily causes a low negative pressure value in the oil suction pipeline. At this time, the electric pump works, and the first port and the second port of the first regulating valve are connected to extract the hydraulic oil in the oil tank into the oil suction pipe, increase the pressure in the oil suction pipeline, prevent the low negative pressure in the pipeline caused by the hydraulic pump oil suction, and avoid abnormal noise, low efficiency and abnormal wear of the hydraulic pump.

[0022] When it is determined that there may be air in the oil suction pipe, the electric pump will be started before the prime mover is started, and the first port and the second port of the first regulating valve will be connected. At this time, the oil output by the electric pump will replenish the oil in the oil suction pipe, and the air in the oil suction pipe will be discharged from one end of the oil suction pipe. After a short delay in this process, the prime mover is started to avoid air inhalation during the operation of the pump group, and avoid problems such as abnormal noise, loss of function and abnormal wear of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a hydraulic circuit diagram of the oil replenishment system of the hydraulic pump oil suction pipeline in an embodiment of the present invention.

[0024] In the figure:

[0025] 100. Hydraulic actuator module; 200. Hydraulic oil radiator;

[0026] 1. Fuel tank;

[0027] 21. Pump group; 211. Hydraulic pump; 22. Oil suction pipe; 23. Filter element; 24. Exhaust pipe group; 241. Exhaust pipe; 242. Second regulating valve;

[0028] 31. Electric pump; 32. First regulating valve; 33. Overflow valve; 34. Connecting pipe;

[0029] 4. Temperature sensor. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] like Figure 1As shown, the present embodiment provides an oil replenishing system for a hydraulic pump suction pipeline, which includes an oil tank 1, an oil pumping module and an oil replenishing module, the oil pumping module includes a pump group 21 and an oil suction pipe 22, the oil suction port of the pump group 21 is connected to the oil suction pipe 22, one end of the oil suction pipe 22 is connected to the oil tank 1, and the pump group 21 is used to be connected to the PTO port of the prime mover of the walking mechanical equipment; the oil replenishing module includes an electric pump 31 and a first regulating valve 32, the oil suction port of the electric pump 31 is connected to the oil tank 1, the oil outlet of the electric pump 31 is connected to the first port of the first regulating valve 32, the second port of the first regulating valve 32 is connected to the other end of the oil suction pipe 22, the first regulating valve 32 can control the on and off of the first port and the second port, and the battery of the walking mechanical equipment is used to power the electric pump 31.

[0035] When the walking mechanical equipment is working, the prime mover PTO port of the walking mechanical equipment drives the pump group 21 to work, and then extracts the oil in the oil tank 1 through the oil suction pipe 22, and then provides high-pressure oil to the hydraulic execution module 100 of the walking mechanical equipment. When the temperature of the hydraulic oil is low, the viscosity of the hydraulic oil is high. At this time, the oil suction condition of the hydraulic pump 211 is not good, which easily causes a low negative pressure value in the oil suction pipe 22. At this time, the electric pump 31 works, and the first port and the second port of the first regulating valve 32 are connected to extract the hydraulic oil in the oil tank 1 into the oil suction pipe 22, increase the pressure in the oil suction pipe 22, prevent the low negative pressure in the pipeline caused by the oil suction of the hydraulic pump 211, and avoid abnormal noise, low efficiency and abnormal wear of the hydraulic pump 211.

[0036] When it is determined that there may be air in the oil suction pipe 22, the electric pump 31 will be started before the prime mover is started, and the first port and the second port of the first regulating valve 32 are connected. At this time, the oil output by the electric pump 31 will replenish the oil in the oil suction pipe 22, and the air in the oil suction pipe 22 will be discharged from one end of the oil suction pipe 22. After a short delay in this process, the prime mover is started to avoid the pump group 21 from sucking in air when working, avoiding problems such as abnormal noise, loss of function and abnormal wear of the pump.

[0037] Specifically, the electric pump 31 is an electric gear pump. In other embodiments, the electric pump 31 may also be an electric plunger pump.

[0038] Optionally, the oil pump module also includes a filter element 23 and an exhaust pipe group 24, the filter element 23 is connected in series to the oil suction pipe 22 between the oil tank 1 and the pump group 21, the oil suction pipe 22 between the filter element 23 and the pump group 21 is connected to the inlet end of the exhaust pipe group 24, and the outlet end of the exhaust pipe group 24 is connected to the oil tank 1, and the exhaust pipe group 24 includes a first state and a second state. In the first state, the inlet end and the outlet end of the exhaust pipe group 24 are connected, and in the second state, the inlet end of the exhaust pipe group 24 and the outlet end of the exhaust pipe group 24 are disconnected, or the inlet end of the exhaust pipe group 24 is unidirectionally connected to the outlet end of the exhaust pipe group 24. In this embodiment, the filter element 23 can filter out impurities in the oil tank 1 to prevent the impurities from damaging the pump group 21 or the hydraulic actuator module 100. However, when the oil suction pipe 22 is vented, the filter element 23 is not conducive to the gas in the oil suction pipe 22 being discharged from one end of the oil suction pipe 22. Therefore, a separate exhaust pipe group 24 is provided. When the oil suction pipe 22 needs to be vented, the exhaust pipe group 24 is in a first state, and the exhaust damping of the exhaust pipe group 24 is less than the exhaust damping at the filter element 23. Then, the gas in the oil suction pipe 22 is discharged from the exhaust pipe group 24. When the oil suction pipe 22 does not need to be vented, the exhaust pipe group 24 is in a second state. When the pump group 21 is working, the oil in the oil tank 1 enters the oil suction pipe 22 through the filter element 23.

[0039] Optionally, the exhaust pipe assembly 24 includes an exhaust pipe 241 and a second regulating valve 242, the oil suction pipe 22 between the filter element 23 and the pump assembly 21 is connected to the inlet end of the exhaust pipe 241, the outlet end of the exhaust pipe 241 is connected to the oil tank 1, the second regulating valve 242 is connected in series to the exhaust pipe 241, and the second regulating valve 242 includes a first position a and a second position a. In the first position a, the exhaust pipe assembly 24 is in a first state, and in the second position a, the exhaust pipe assembly 24 is in a second state. In this embodiment, in the first position a, the oil suction pipe 22 can exhaust gas to the outside through the exhaust pipe 241. In the second position a, the exhaust pipe 241 is disconnected, so that the oil or gas in the oil suction pipe 22 cannot be discharged from the exhaust pipe 241 to the oil tank 1, or the second regulating valve 242 has a built-in one-way valve. In the second position a, the exhaust pipe 241 is connected in series with the one-way valve. After the hydraulic oil or gas in the oil suction pipe 22 reaches a preset pressure, it can flow to the outlet of the exhaust pipe 241 through the inlet end of the exhaust pipe 241. This setting can relieve the pressure of the oil suction pipe 22 when the pressure in the oil suction pipe 22 is too high. Specifically, the second regulating valve 242 is a two-position two-way solenoid valve.

[0040] Optionally, the second regulating valve 242 may be replaced by a one-way valve. The opening pressure of the one-way valve is set as low as possible to allow air to be discharged. When negative pressure is generated by oil suction, the one-way valve closes automatically.

[0041] Optionally, the height of the second regulating valve 242 from the ground is greater than the maximum height of the oil suction pipe 22 from the ground. In this embodiment, this arrangement facilitates the gas in the oil suction pipe 22 to flow to the second regulating valve 242 along with the hydraulic oil, thereby facilitating the exhaust of the oil suction pipe 22. Specifically, the height of the second regulating valve 242 from the ground is the height of the bottom end of the second regulating valve 242 from the ground.

[0042] Optionally, the first regulating valve 32 further includes a third port, and the third port is used to communicate with the hydraulic oil radiator 200 of the walking mechanical equipment. The first regulating valve 32 includes a first position b and a second position b. At the first position b, the first port and the second port are communicated, and at the second position b, the first port and the third port are communicated. In this embodiment, when the temperature of the hydraulic oil in the oil tank 1 is high, the first regulating valve 32 is adjusted to the second position b, and the hydraulic oil radiator 200 can dissipate heat for the hydraulic oil in the oil tank 1. When the oil suction pipe 22 needs to be replenished, the temperature of the hydraulic oil in the oil tank 1 is usually low, and the hydraulic oil radiator 200 does not need to work at this time, so the first regulating valve 32 can be adjusted to the first position b. Optionally, the first regulating valve 32 is a two-position three-way solenoid valve. In other embodiments, the first regulating valve 32 can also be a priority valve or a two-position two-way solenoid valve, which does not include a third port.

[0043] In other embodiments, when the first regulating valve 32 includes a third port, other hydraulic execution modules 100 may also be connected to the third port of the first regulating valve 32. Specifically, the hydraulic execution module 100 includes a hydraulic multi-way valve, a hydraulic cylinder, a hydraulic motor, a hydraulic brake and other devices.

[0044] When the temperature of the hydraulic oil in the oil tank 1 is low, in order to quickly heat up the hydraulic oil in the oil tank 1, reduce the viscosity of the hydraulic oil, and improve the fluidity of the hydraulic oil, the second port can be optionally set as a damping hole. This setting can increase the damping force of the hydraulic oil passing through the second port, thereby increasing the power of converting hydraulic energy into thermal energy and heating the hydraulic oil.

[0045] Optionally, the maximum height of the electric pump 31 from the ground is less than the height of the liquid level of the oil tank 1 from the ground. In this embodiment, when the electric pump 31 is arranged, the maximum height from the ground is less than the height of the liquid level of the oil tank 1 from the ground, and it can be arranged at a position close to the oil tank 1. This arrangement can avoid gas retention in the connecting pipe 34 and shorten the length of the connecting pipe 34 as much as possible, reducing the loss along the connecting pipe 34. Specifically, the maximum height of the electric pump 31 from the ground is the height of the upper end surface of the electric pump 31 from the ground.

[0046] Optionally, the oil replenishment module further includes a relief valve 33, which is connected in parallel with the electric pump 31. In this embodiment, when the oil pressure in the pipeline between the electric pump 31 and the first regulating valve 32 is too high, part of the oil can be introduced into the pipeline between the electric pump 31 and the oil tank 1 through the relief valve 33 to improve the overall stability and safety of the system.

[0047] Optionally, the pump group 21 includes a plurality of hydraulic pumps 211, and the oil suction ports of the plurality of hydraulic pumps 211 are connected to the oil suction pipe 22. In this embodiment, the oil outlets of the plurality of hydraulic pumps 211 are connected to different hydraulic execution modules 100. Specifically, the hydraulic execution module 100 includes a hydraulic multi-way valve, a hydraulic cylinder, a hydraulic motor, a hydraulic brake and other devices.

[0048] Optionally, the hydraulic pump oil suction pipeline oil replenishment system further includes a temperature sensor 4, which is used to monitor the oil temperature in the oil tank 1. In this embodiment, when the temperature sensor 4 detects that the temperature of the hydraulic oil in the oil tank 1 is too low, the electric pump 31 is started, and the first regulating valve 32 is switched to the first position b, so that the hydraulic oil in the oil tank 1 can be heated. When the temperature sensor 4 monitors that the temperature of the hydraulic oil in the oil tank 1 reaches a set value, the electric pump 31 is turned off, or the first regulating valve 32 is switched to the second position b.

[0049] This embodiment also provides a walking mechanical device, including the hydraulic pump oil suction pipeline oil replenishing system in the above solution.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The hydraulic pump suction pipeline oil replenishment system is characterized by: include: Fuel tank (1); An oil pump module comprises a pump group (21) and an oil suction pipe (22), wherein the oil suction port of the pump group (21) is connected to the oil suction pipe (22), one end of the oil suction pipe (22) is connected to the oil tank (1), and the pump group (21) is used to be connected to a PTO port of a prime mover of a walking mechanical device; The oil replenishment module comprises an electric pump (31) and a first regulating valve (32), wherein the oil suction port of the electric pump (31) is connected to the oil tank (1), the oil outlet of the electric pump (31) is connected to the first port of the first regulating valve (32), the second port of the first regulating valve (32) is connected to the other end of the oil suction pipe (22), and the first regulating valve (32) can control the opening and closing of the first port and the second port.

2. The hydraulic pump oil suction pipeline oil replenishment system according to claim 1, characterized in that: The oil pump module also includes a filter element (23) and an exhaust pipe group (24). The filter element (23) is connected in series to the portion of the oil suction pipe (22) located between the oil tank (1) and the oil suction port of the pump group (21). The oil suction pipe (22) between the filter element (23) and the pump group (21) is connected to the inlet end of the exhaust pipe group (24), and the outlet end of the exhaust pipe group (24) is connected to the oil tank (1). The exhaust pipe group (24) includes a first state and a second state. In the first state, the inlet end and the outlet end of the exhaust pipe group (24) are connected. In the second state, the inlet end of the exhaust pipe group (24) and the outlet end of the exhaust pipe group (24) are disconnected, or the inlet end of the exhaust pipe group (24) is unidirectionally connected to the outlet end of the exhaust pipe group (24).

3. The hydraulic pump oil suction pipeline oil replenishment system according to claim 2, characterized in that: The exhaust pipe group (24) comprises an exhaust pipe (241) and a second regulating valve (242); the oil suction pipe (22) between the filter element (23) and the pump group (21) is connected to the inlet end of the exhaust pipe (241); the outlet end of the exhaust pipe (241) is connected to the oil tank (1); the second regulating valve (242) is connected in series to the exhaust pipe (241); the second regulating valve (242) comprises a first position a and a second position a; in the first position a, the exhaust pipe group (24) is in the first state; in the second position a, the exhaust pipe group (24) is in the second state.

4. The hydraulic pump oil suction pipeline oil replenishing system according to claim 3, characterized in that: The height of the second regulating valve (242) from the ground is greater than the maximum height of the oil suction pipe (22) from the ground.

5. The hydraulic pump oil suction pipeline oil replenishment system according to claim 1, characterized in that: The first regulating valve (32) also includes a third port, and the third port is used to communicate with the hydraulic oil radiator (200) of the walking mechanical equipment. The first regulating valve (32) includes a first position b and a second position b. At the first position b, the first port is communicated with the second port, and at the second position b, the first port is communicated with the third port.

6. The hydraulic pump oil suction pipeline oil replenishing system according to claim 5, characterized in that: The second opening is configured as a damping hole.

7. The hydraulic pump oil suction pipeline oil replenishing system according to any one of claims 1 to 6, characterized in that: The maximum height of the electric pump (31) from the ground is less than the height of the liquid level of the oil tank (1) from the ground.

8. The hydraulic pump oil suction pipeline oil replenishing system according to any one of claims 1 to 6, characterized in that: The oil replenishment module further comprises an overflow valve (33), and the overflow valve (33) is connected in parallel with the electric pump (31).

9. The hydraulic pump oil suction pipeline oil replenishment system according to any one of claims 1 to 6, characterized in that: The pump group (21) comprises a plurality of hydraulic pumps (211), and the oil suction ports of the plurality of hydraulic pumps (211) are connected to the oil suction pipe (22).

10. Walking mechanical equipment, characterized in that: The invention comprises the hydraulic pump oil suction pipeline oil replenishing system as described in any one of claims 1 to 9.

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