Hydrostatic drive fast oil replenishment heat dissipation circuit

Abstract

The utility model provides a kind of static hydraulic drive quick oil replenishing heat dissipation circuit, including the drive pump that is connected in circuit in turn, first drive oil circuit, hydraulic motor and second drive oil circuit;Still include oil replenishing pump, the outlet of oil replenishing pump is connected with total oil replenishing circuit, and total oil replenishing circuit is connected first drive oil circuit and second drive oil circuit respectively by oil replenishing branch;Total oil replenishing circuit is also connected with anti-suction oil circuit, and accumulator is equipped on anti-suction oil circuit, and anti-suction oil circuit is connected first drive oil circuit and / or second drive oil circuit by anti-suction check valve.The utility model is used, in emergency braking, oil liquid is continuously replenished to original high pressure side in accumulator by suction check valve, to maintain the oil liquid supply required during the rotation of hydraulic motor under inertia, avoid the suction failure of pump low pressure side caused by oil replenishing deficiency, improve the safety factor of system work.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrostatic drive systems, specifically to a hydrostatic drive rapid oil replenishment and heat dissipation circuit. Background Technology

[0002] The hydrostatic drive system is a crucial component of agricultural machinery. It uses a hydraulic motor to output power, enabling the machinery to move and perform other actions. During operation, the low-pressure side of the hydrostatic system requires replenishment of oil. During sudden braking, while the hydraulic pump stops, the inertial motor's rotation does not stop instantly. This causes oil to be drawn from the high-pressure side of the motor, becoming the low-pressure side, while oil is discharged from the low-pressure side, becoming the high-pressure side. This rapid change in hydraulic pressure can lead to excessive negative pressure on the high-pressure side of the motor, making it difficult to draw in oil. This can cause cavitation in the system, resulting in pump cavitation failure and posing a safety hazard.

[0003] In addition, in conventional hydrostatic drive systems, the flushing flow of the motor and the heat dissipation flow of the system are fixed, and the heat dissipation capacity is limited. Under conditions such as frequent emergency braking, there may be a situation where heat dissipation cannot be completed in time, which can easily lead to high system temperature. Utility Model Content

[0004] To solve at least one of the above technical problems, this utility model provides a hydrostatic drive rapid oil replenishment and heat dissipation circuit.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a hydrostatic drive rapid oil replenishment and heat dissipation circuit, including a drive pump, a first drive oil circuit, a hydraulic motor, and a second drive oil circuit connected in sequence; it also includes an oil replenishment pump, the outlet of which is connected to a main oil replenishment circuit, which is connected to the first drive oil circuit and the second drive oil circuit through oil replenishment branches; the main oil replenishment circuit is also connected to an anti-vacuum oil circuit, which is equipped with an accumulator, and the anti-vacuum oil circuit is connected to the first drive oil circuit and / or the second drive oil circuit through an anti-vacuum check valve.

[0006] The beneficial effects of this utility model are: By employing this utility model, during normal operation, the replenishing oil pump replenishes the accumulator with oil through the main replenishing oil circuit and the anti-vacuum oil circuit; during emergency braking, the accumulator continuously replenishes oil to the original high-pressure side through the anti-vacuum check valve, thereby maintaining the oil supply required for the hydraulic motor to rotate under inertia, avoiding insufficient oil replenishment leading to vacuum failure on the low-pressure side of the pump, and improving the safety factor of the system operation.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the anti-vacuum oil circuit is connected to the first drive oil circuit through an anti-vacuum check valve, and the first drive oil circuit is the forward high-pressure side oil circuit.

[0009] Suitable for agricultural machinery and other machinery that moves forward for extended periods, this system avoids consuming the accumulator's oil on the low-pressure side and ensures that the accumulator can provide sufficient oil and pressure to the high-pressure side during emergency braking.

[0010] Furthermore, the anti-vacuum oil circuit is also connected to a cooling oil circuit, which is equipped with a cooling control valve and is connected to the cooling oil inlet of the hydraulic motor.

[0011] Under conditions such as frequent emergency braking, when the original system's heat dissipation is insufficient to cool down the system in time, opening the heat dissipation control valve allows the oil from the replenishing pump and the accumulator to enter the hydraulic motor to accelerate heat dissipation, thus avoiding insufficient oil replenishment that could lead to high system temperatures.

[0012] Furthermore, a first throttling orifice is also provided on the cooling oil circuit.

[0013] This facilitates the control of the flow rate of the cooling oil circuit, preventing the accumulator from being consumed too quickly and resulting in waste.

[0014] Furthermore, the hydraulic motor's cooling oil outlet is also equipped with a temperature sensor, the temperature sensor signal is connected to a valve controller, and the valve controller signal is connected to the cooling control valve.

[0015] When the temperature sensor detects that the outlet oil temperature of the hydraulic motor reaches the set value, the valve controller controls the cooling control valve to open, which facilitates automatic control and has a fast response.

[0016] Furthermore, the cooling oil outlet of the hydraulic motor is also connected to a radiator; it also includes a cooling multi-way valve, the first inlet of which is connected to the first drive oil circuit via an oil circuit, the second inlet of which is connected to the second drive oil circuit via an oil circuit, and the outlet of which is connected to the cooling oil outlet of the hydraulic motor via an oil circuit.

[0017] By switching the valve position using the cooling multi-way valve, the low-pressure side oil in the circuit between the drive pump and the hydraulic motor can flow out through the cooling oil outlet of the hydraulic motor and enter the radiator for cooling, achieving normalized cooling and ensuring the reliability of the hydraulic system. At the same time, when the cooling control valve is opened for emergency cooling, the radiator can also cool the oil from the cooling control valve and through the hydraulic motor housing, which can improve the efficiency of the radiator and save equipment investment.

[0018] Furthermore, the outlet oil line of the heat dissipation multi-way valve is also provided with a heat dissipation overflow valve and a second throttle orifice, which are connected in parallel.

[0019] The second throttle orifice restricts the oil flow rate on the low-pressure side of the drive pump and hydraulic motor circuit, ensuring stable and reliable oil suction from the low-pressure side for the drive pump. When the second throttle orifice is blocked, causing the outlet oil pressure of the cooling multi-way valve to rise, the cooling relief valve opens, allowing the oil to enter the radiator for cooling, thus improving the reliability of heat dissipation.

[0020] Furthermore, an oil replenishment overflow valve is also provided on the oil replenishment branch.

[0021] When the outlet pressure of the oil replenishment relief valve increases, the oil replenishment relief valve closes, which facilitates the replenishment of oil from the oil replenishment branch to the low-pressure side drive oil circuit, and prevents oil leakage from the high-pressure side drive oil circuit through the oil replenishment branch, thus improving safety.

[0022] Furthermore, a filter is also provided on the main oil replenishment line.

[0023] This facilitates improved oil cleanliness and ensures reliable operation of the drive pump and hydraulic motor circuit.

[0024] Furthermore, the outlet of the replenishing pump is also connected to an oil suction branch, which is equipped with an oil suction overflow valve. The outlet of the oil suction overflow valve is connected to the inlet of the replenishing pump. The main replenishing line is also connected to a pressure relief branch, which is equipped with a pressure relief valve.

[0025] When the outlet pressure of the replenishing pump is too high, some oil can flow back to the inlet of the replenishing pump through the suction overflow valve; when the pressure of the main replenishing circuit is too high, some oil can flow back to the oil tank through the pressure relief valve; thus ensuring the stability of the oil pressure in the main replenishing circuit and preventing the replenishing oil pressure from affecting the normal operation of the hydraulic motor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-Drive pump; 2-Hydraulic motor; 3-First drive oil circuit; 4-Second drive oil circuit; 5-Maintenance pump; 6-Anti-vacuum oil circuit; 7-Vacuum check valve; 8-Accumulator; 9-Cooling control valve; 10-First throttle orifice; 11-Temperature sensor; 12-Radiator; 13-Cooling multi-way valve; 14-Cooling relief valve; 15-Second throttle orifice; 16-Maintenance relief valve; 17-Filter; 18-Suction relief valve; 19-Pressure relief valve. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] This utility model refers to Figure 1 .

[0030] This utility model provides a hydrostatic drive rapid oil replenishment and heat dissipation circuit, including a drive pump 1, a first drive oil circuit 3, a hydraulic motor 2, and a second drive oil circuit 4 connected in sequence; it also includes an oil replenishment pump 5, the outlet of which is connected to a main oil replenishment circuit, which is connected to the first drive oil circuit 3 and the second drive oil circuit 4 through oil replenishment branches; the main oil replenishment circuit is also connected to an anti-vacuum oil circuit 6, which is equipped with an accumulator 8, and the anti-vacuum oil circuit 6 is connected to the first drive oil circuit 3 and / or the second drive oil circuit 4 through an anti-vacuum check valve 7.

[0031] principle: During operation, drive pump 1 drives hydraulic motor 2 through the circuit. Replenishment pump 5 replenishes oil to the low-pressure side of the circuit through the main replenishment line and replenishment branch lines to compensate for leaks or release oil for heat dissipation. Simultaneously, replenishment pump 5 fills accumulator 8 with oil through the main replenishment line and anti-cavitation oil line 6. Anti-cavitation check valve 7 allows oil to flow unidirectionally from accumulator 8 to the first drive line 3 and / or the second drive line 4, thus preventing oil leakage from the high-pressure side of the circuit. During emergency braking, drive pump 1 stops, and hydraulic motor 2 rotates under inertia and continues to draw oil from the original high-pressure side, causing the oil pressure on the original high-pressure side to drop instantaneously. Since there is sufficient oil in accumulator 8, to avoid insufficient replenishment flow, the oil can be replenished to the original high-pressure side through anti-cavitation check valve 7, thereby maintaining the oil supply required for hydraulic motor 2 to rotate under inertia and preventing anti-cavitation failure on the low-pressure side of drive pump 1.

[0032] The anti-vacuum oil circuit 6 is connected to the first drive oil circuit 3 and / or the second drive oil circuit 4 through an anti-vacuum check valve 7: that is, the anti-vacuum oil circuit 6 may have one anti-vacuum check valve 7, which is connected to the first drive oil circuit 3 or the second drive oil circuit 4; the anti-vacuum oil circuit 6 may also have two anti-vacuum check valves 7, one of which is connected to the first drive oil circuit 3 and the other is connected to the second drive oil circuit 4.

[0033] Anti-vacuum oil circuit 6 is connected through anti-vacuum check valve 7: that is, anti-vacuum check valve 7 is the key point of anti-vacuum oil circuit 6. In the figure, the first drive oil circuit 3 is to the right of anti-vacuum check valve 7.

[0034] With this invention, during normal operation, the oil replenishing pump 5 replenishes oil to the accumulator 8 through the main oil replenishing circuit and the anti-vacuum oil circuit 6; during emergency braking, the accumulator 8 continuously replenishes oil to the original high-pressure side through the anti-vacuum check valve 7, thereby maintaining the oil supply required for the hydraulic motor 2 to rotate under inertia, avoiding insufficient oil replenishment leading to vacuum failure on the low-pressure side of the pump, and improving the safety factor of the system operation.

[0035] Furthermore, the anti-vacuum oil circuit 6 is connected to the first drive oil circuit 3 via an anti-vacuum check valve 7, and the first drive oil circuit 3 is the forward high-pressure side oil circuit.

[0036] Suitable for agricultural machinery and other machinery that moves forward for long periods of time, it avoids the consumption of oil in the accumulator 8 on the low-pressure side and ensures that the accumulator 8 can provide sufficient oil and oil pressure to the high-pressure side during emergency braking.

[0037] Furthermore, the anti-vacuum oil circuit 6 is also connected to a cooling oil circuit, which is equipped with a cooling control valve 9 and is connected to the cooling oil inlet of the hydraulic motor 2.

[0038] Note: The cooling oil inlet is located on the housing of the hydraulic motor 2, which is used to supply oil into the housing of the hydraulic motor 2 to remove the heat of the hydraulic motor 2. This type of hydraulic motor 2 is a prior art product.

[0039] Under conditions such as frequent emergency braking, when the original system's heat dissipation is insufficient to cool down the system in time, opening the heat dissipation control valve 9 allows the oil from the replenishing pump 5 and the accumulator 8 to enter the hydraulic motor 2 to accelerate heat dissipation, thus avoiding insufficient oil replenishment leading to high system temperature.

[0040] Furthermore, the cooling oil circuit is also provided with a first throttling hole 10.

[0041] This facilitates the control of the flow rate of the cooling oil circuit, preventing the accumulator 8 from being consumed too quickly and resulting in waste.

[0042] Furthermore, the cooling oil outlet of the hydraulic motor 2 is also equipped with a temperature sensor 11, which is signal-connected to a valve controller, and the valve controller is signal-connected to the cooling control valve 9.

[0043] Note: Temperature sensor 11 detects temperature and transmits it to valve controller. Valve controller controls valve opening and closing by comparing temperature with set value. Existing technologies can be used, such as PLC negative feedback control.

[0044] When the temperature sensor 11 detects that the cooling oil outlet temperature of the hydraulic motor 2 has reached the set value, the valve controller controls the cooling control valve 9 to open, which facilitates automatic control and has a fast response.

[0045] Furthermore, the cooling oil outlet of the hydraulic motor 2 is also connected to a radiator 12; it also includes a cooling multi-way valve 13, the first inlet of the cooling multi-way valve 13 is connected to the first drive oil circuit 3 through an oil circuit, the second inlet of the cooling multi-way valve 13 is connected to the second drive oil circuit 4 through an oil circuit, and the outlet of the cooling multi-way valve 13 is connected to the cooling oil outlet of the hydraulic motor 2 through an oil circuit.

[0046] Preferably, the heat dissipation multi-way valve 13 can be built into the housing of the hydraulic motor 2, and its outlet oil flows out through the heat dissipation oil outlet of the hydraulic motor 2.

[0047] By switching the valve position of the cooling multi-way valve 13, the low-pressure side oil of the circuit between the drive pump 1 and the hydraulic motor 2 can flow out through the cooling oil outlet of the hydraulic motor 2 and enter the radiator 12 for cooling, thereby achieving normal cooling and ensuring the reliability of the hydraulic system. At the same time, when the cooling control valve 9 is opened for emergency cooling, the radiator 12 can also cool the oil from the cooling control valve 9 and through the housing of the hydraulic motor 2, which can improve the utilization efficiency of the radiator 12 and save equipment investment.

[0048] Furthermore, the outlet oil line of the heat dissipation multi-way valve 13 is also provided with a heat dissipation overflow valve 14 and a second throttling orifice 15, and the heat dissipation overflow valve 14 and the second throttling orifice 15 are connected in parallel.

[0049] The second throttle orifice 15 can constrain the oil flow rate on the low-pressure side of the circuit between the drive pump 1 and the hydraulic motor 2, ensuring that the drive pump 1 can reliably draw oil from the low-pressure side. When the second throttle orifice 15 is blocked, causing the outlet oil pressure of the cooling multi-way valve 13 to rise, the cooling relief valve 14 opens, and the oil can enter the radiator 12 for cooling through the cooling relief valve 14, thus improving the reliability of heat dissipation.

[0050] Furthermore, an oil replenishment overflow valve 16 is also provided on the oil replenishment branch.

[0051] When the outlet pressure of the oil replenishment relief valve 16 increases, the oil replenishment relief valve 16 closes, which facilitates the replenishment of oil from the oil replenishment branch to the low-pressure side drive oil circuit, and avoids leakage of oil from the high-pressure side drive oil circuit through the oil replenishment branch, thus improving safety.

[0052] Furthermore, a filter 17 is also provided on the main oil replenishment line.

[0053] This facilitates improved oil replenishment cleanliness and ensures reliable operation of the circuit between drive pump 1 and hydraulic motor 2.

[0054] Furthermore, the outlet of the replenishing pump 5 is also connected to an oil suction branch, and an oil suction overflow valve 18 is provided on the oil suction branch. The outlet of the oil suction overflow valve 18 is connected to the inlet of the replenishing pump 5. The main replenishing line is also connected to a pressure relief branch, and a pressure relief valve 19 is provided on the pressure relief branch.

[0055] Preferably, the pressure relief branch is located on the outlet side of the filter 17.

[0056] When the outlet pressure of the replenishing pump 5 is too high, some oil can flow back to the inlet of the replenishing pump 5 through the suction overflow valve 18; when the pressure of the main replenishing circuit is too high, some oil can flow back to the oil tank through the pressure relief valve 19; thus ensuring the stability of the oil pressure of the main replenishing circuit and avoiding the replenishing oil pressure from affecting the normal operation of the hydraulic motor 2.

[0057] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0058] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0060] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0061] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A hydrostatically driven rapid oil replenishment and cooling circuit, characterized in that: It includes a drive pump (1), a first drive oil circuit (3), a hydraulic motor (2), and a second drive oil circuit (4) connected in sequence in a loop; it also includes a replenishing oil pump (5), the outlet of which is connected to a main replenishing oil circuit, which is connected to the first drive oil circuit (3) and the second drive oil circuit (4) through replenishing oil branches; the main replenishing oil circuit is also connected to an anti-vacuum oil circuit (6), which is equipped with an accumulator (8), and the anti-vacuum oil circuit (6) is connected to the first drive oil circuit (3) and / or the second drive oil circuit (4) through an anti-vacuum check valve (7).

2. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 1, characterized in that: The anti-vacuum oil circuit (6) is connected to the first drive oil circuit (3) through the anti-vacuum check valve (7), and the first drive oil circuit (3) is the forward high-pressure side oil circuit.

3. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 2, characterized in that: The anti-air suction oil circuit (6) is also connected to a heat dissipation oil circuit, which is equipped with a heat dissipation control valve (9) and is connected to the heat dissipation oil inlet of the hydraulic motor (2).

4. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 3, characterized in that: The cooling oil circuit is also provided with a first throttling hole (10).

5. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 3, characterized in that: The hydraulic motor (2) is also equipped with a temperature sensor (11) at its cooling oil outlet. The temperature sensor (11) is connected to a valve controller, which is connected to the cooling control valve (9).

6. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 3, characterized in that: The cooling oil outlet of the hydraulic motor (2) is also connected to a radiator (12); it also includes a cooling multi-way valve (13), the first inlet of the cooling multi-way valve (13) is connected to the first drive oil circuit (3) through an oil circuit, the second inlet of the cooling multi-way valve (13) is connected to the second drive oil circuit (4) through an oil circuit, and the outlet of the cooling multi-way valve (13) is connected to the cooling oil outlet of the hydraulic motor (2) through an oil circuit.

7. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 6, characterized in that: The outlet oil line of the heat dissipation multi-way valve (13) is also provided with a heat dissipation overflow valve (14) and a second throttle orifice (15), and the heat dissipation overflow valve (14) and the second throttle orifice (15) are connected in parallel.

8. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 1, characterized in that: The oil replenishment branch is also equipped with an oil replenishment overflow valve (16).

9. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 1, characterized in that: The main oil replenishment line is also equipped with a filter (17).

10. The hydrostatic drive rapid oil replenishment and cooling circuit according to claim 1, characterized in that: The outlet of the replenishing pump (5) is also connected to an oil suction branch, and an oil suction overflow valve (18) is provided on the oil suction branch. The outlet of the oil suction overflow valve (18) is connected to the inlet of the replenishing pump (5). The main replenishing line is also connected to a pressure relief branch, and a pressure relief valve (19) is provided on the pressure relief branch.

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