Constant pressure hydraulic station integrated with emergency pump function

Abstract

The utility model relates to hydraulic power source technical field especially relates to a constant pressure hydraulic station of integrated emergency pump function, its technical scheme includes: hydraulic oil tank, variable pump and gear pump by alternating -current motor drive by direct current motor drive, two pump export pipeline through first, second check valve confluence to same main oil circuit, and is limited highest working pressure by main, secondary overflow valve respectively, and the filter and pressure reducing valve group are equipped successively in main oil circuit downstream. The utility model discloses redundant oil supply system that constitutes by alternating -current main pump and direct current emergency pump, can seamlessly switch to emergency pump when main pump failure, guarantees operation continuity, and main pump adopts constant pressure variable pump, has the advantage of energy -conserving and fast response, and through pressure reducing valve group can convert the constant pressure oil of pump output into a stable low pressure oil, realizes'one station two pressure ', satisfies the pressure demand of different execution mechanism.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic power source technology, and in particular to a constant pressure hydraulic station with integrated emergency pump function. Background Technology

[0002] Hydraulic power units, as the power source of hydraulic systems, are widely used in various industrial equipment and construction machinery. Traditional hydraulic power units typically consist of a single motor driving a single oil pump, with relatively fixed output pressure and flow rate. This type of system has the following significant drawbacks: First, when the drive motor or main pump fails, the entire hydraulic system will shut down completely, causing equipment operation to be interrupted, which can result in huge economic losses in situations where production continuity is required. Secondly, traditional single-pump hydraulic stations can usually only provide hydraulic oil of a single pressure level. For actuators that require different working pressures, such as high-pressure clamping mechanisms and low-pressure feeding mechanisms, it is often necessary to configure two independent hydraulic systems or use complex valve control circuits for pressure reduction. This results in complex system structure, high cost, large energy loss and slow response speed.

[0003] Although some backup pump solutions exist in the existing technology, most of them are homogeneous backups such as dual AC motor pump sets, which not only occupy a large area and have high costs, but also cannot start when the main circuit fails. Therefore, there is an urgent need in the field for a highly integrated, reliable hydraulic station that can continuously supply oil and meet multiple pressure requirements.

[0004] Therefore, we propose a constant pressure hydraulic station with integrated emergency pump function to solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a constant pressure hydraulic station that integrates an emergency pump function.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a constant pressure hydraulic station with integrated emergency pump function, including a hydraulic oil tank, a main pump driven by an AC motor, an emergency pump driven by a DC motor, a main relief valve, a secondary relief valve, and a main oil circuit leading to the actuator. The main pump is a variable pump, with its inlet connected to the hydraulic oil tank and its outlet connected to the main oil circuit. The emergency pump is a gear pump, with its inlet connected to the hydraulic oil tank and its outlet connected to the main oil circuit. The outlet pipeline of the variable pump and the outlet pipeline of the gear pump are connected to the same main oil circuit, and a first check valve and a second check valve are respectively installed before the junction point. The outlets of the first check valve and the second check valve are connected to the downstream of the main oil circuit. The inlet of the main relief valve is connected to the pipeline between the outlet of the variable pump and the first check valve, and its return port is connected to the hydraulic oil tank. The inlet of the secondary overflow valve is connected to the pipeline between the outlet of the gear pump and the second check valve, and its return port is connected to the hydraulic oil tank.

[0007] Preferably, a filter and a pressure reducing valve assembly are sequentially arranged on the main oil line downstream of the first check valve and the second check valve.

[0008] Preferably, a pressure sensor and a pressure gauge for detecting system pressure are also connected in parallel on the main oil line.

[0009] Preferably, the variable pump is a constant pressure variable displacement piston pump.

[0010] Preferably, the pressure reducing valve assembly is an integrated valve block, which integrates a pressure reducing valve, a reversing valve, and a pressure switch.

[0011] Preferably, the hydraulic oil tank is equipped with an oil suction filter, an air filter, a level gauge, and a drain valve.

[0012] Preferably, the main relief valve is used to set the maximum operating pressure of the variable pump, and the secondary relief valve is used to set the maximum operating pressure of the gear pump.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model sets up a gear pump driven by a DC motor as an emergency pump, which serves as a backup to the main variable pump system driven by an AC motor. When the AC motor or variable pump of the main pump system fails, the emergency pump system can be started immediately to continue supplying oil to the system, effectively avoiding the shutdown of the entire equipment due to a single point failure of the hydraulic station, and greatly improving the reliability and continuity of operation of the oil station. By installing a pressure reducing valve group on the main oil line, the constant high-pressure oil provided by the main pump or emergency pump can be converted into a stable low-pressure oil output, realizing "one station with two pressures" that is, one high-pressure and one low-pressure. This can simultaneously meet the needs of actuators that require different working pressures, such as one high-pressure operating mechanism and one low-pressure operating mechanism, simplifying the oil station structure and reducing the overall cost. The main pump adopts a constant pressure variable displacement piston pump. When the operating pressure reaches the set value, the pump displacement will automatically decrease to the level that only compensates for leakage, maintaining constant pressure. Compared with a fixed displacement pump with an overflow valve, this fundamentally eliminates overflow energy loss and has a significant energy-saving effect. At the same time, the constant pressure variable displacement pump itself has the advantage of fast response. By setting the main relief valve and the secondary relief valve, the maximum working pressure of the variable pump and the gear pump are limited respectively. The dual protection ensures the safety of the device. The main pump oil circuit and the emergency pump oil circuit are effectively isolated by the first check valve and the second check valve to prevent mutual interference and impact of pressure, avoid high pressure oil backflow and damage to the pump body, and ensure that each pump works independently and stably. The device is equipped with a pressure sensor and a pressure gauge, which can monitor the operating pressure in real time, facilitating fault diagnosis and status observation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall oil circuit of this utility model.

[0015] Figure label: 1. Hydraulic oil tank; 2. AC motor; 3. Variable pump; 4. Main relief valve; 5. Pressure sensor; 6. Filter; 7. Pressure gauge; 8. Pressure reducing valve assembly; 9. First check valve; 10. Second check valve; 11. Secondary relief valve; 12. Gear pump; 13. DC motor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1 like Figure 1 As shown, the constant pressure hydraulic station with integrated emergency pump function proposed in this utility model includes a hydraulic oil tank 1, a main pump driven by an AC motor 2, an emergency pump driven by a DC motor 13, a main relief valve 4, a secondary relief valve 11, and a main oil circuit leading to the actuator. Its core is to construct a redundant oil supply system composed of an AC main pump system and a DC emergency pump system connected in parallel, and to achieve multiple pressure outputs through a pressure reducing valve group 8. The hydraulic oil tank 1 stores and provides hydraulic oil for the entire system. The AC motor 2 serves as the main drive source, and its output shaft is directly connected to and drives the variable pump 3. The variable pump 3 draws oil from the hydraulic oil tank 1 and outputs high-pressure oil from its outlet. A main relief valve 4 is connected to the pipeline between the outlet and the first check valve 9 to limit the maximum working pressure of the variable pump 3 and to provide safety protection.

[0018] Meanwhile, the DC motor 13 serves as an emergency drive source, with its output shaft directly connected to and driving the gear pump 12. The gear pump 12 also draws oil from the hydraulic oil tank 1, and the oil outlet lines of the variable pump 3 and the gear pump 12 eventually merge into the same main oil circuit.

[0019] To ensure that the two systems operate independently without interfering with each other, a first check valve 9 is installed on the oil outlet line of the variable pump 3, and a second check valve 10 is installed on the oil outlet line of the gear pump 12. The outlets of these two check valves are connected to the downstream main oil circuit. Their function is to allow oil to flow only from the pump to the system, which can effectively prevent pressure interference and impact between the main pump system and the emergency pump system, and avoid high-pressure oil backflow that could damage the pump body.

[0020] Downstream of the main oil circuit after the first check valve 9 and the second check valve 10, a filter 6 and a pressure reducing valve assembly 8 are connected in sequence. The filter 6 is responsible for filtering out contaminants in the oil to ensure the cleanliness of the system oil. The pressure reducing valve assembly 8 is a core control unit, which is an integrated valve block that integrates a pressure reducing valve, a reversing valve, and a pressure switch. Its function is to reduce the high-pressure oil from upstream to the required stable low pressure and control the opening and closing of the low-pressure oil circuit, thereby achieving simultaneous output of one high-pressure circuit and one low-pressure circuit to meet the needs of different actuators.

[0021] In order to monitor the system's working status in real time, a pressure sensor 5 and a pressure gauge 7 are installed in parallel on the main oil line. The pressure sensor 5 can convert the pressure signal into an electrical signal for remote monitoring and control, while the pressure gauge 7 is used to display the system pressure locally.

[0022] The gear pump 12 has a secondary overflow valve 11 connected to its oil outlet line, and its return port is connected to the hydraulic oil tank 1. Its function is to set the maximum working pressure for the gear pump 12 to ensure the safe operation of the emergency system.

[0023] The hydraulic oil tank 1 serves as a basic component, on which necessary accessories are installed: an oil suction filter for preliminary filtration of the oil entering the pump, an air filter for maintaining the oil tank's interior in contact with the atmosphere and preventing contaminants from entering, a level gauge for observing the oil level, and a drain valve for emptying the oil tank when changing the oil.

[0024] The working principle of this utility model is as follows: During normal operation, the AC motor 2 is started, driving the variable pump 3 to run. The pressurized oil opens the first check valve 9, and after being filtered by the filter 6, part of the pressure is converted into a stable low-pressure output through the pressure reducing valve group 8, while the other part remains at a high-pressure output. At this time, the second check valve 10 closes under the action of the main line pressure, isolating the emergency system from the main system, and the main relief valve 4 acts as a safety valve for the main system.

[0025] In emergency operations, when the main system fails, the DC motor 13 is immediately started to drive the gear pump 12 to run. The pressure oil opens the second check valve 10 and provides the required pressure oil to the system through the same filter 6 and pressure reducing valve group 8, ensuring the continuous operation of the actuator and avoiding operation interruption. At this time, the first check valve 9 is closed to isolate the faulty main system from the emergency system. The secondary relief valve 11 serves as the safety valve of the emergency system.

[0026] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A constant pressure hydraulic station integrating an emergency pump function, comprising a hydraulic oil tank (1), a main pump driven by an AC motor (2), an emergency pump driven by a DC motor (13), a main relief valve (4), a secondary relief valve (11), and a main oil circuit leading to an actuator, characterized in that: The main pump is a variable pump (3), whose inlet is connected to the hydraulic oil tank (1), and whose outlet is connected to the main oil circuit; The emergency pump is a gear pump (12), whose inlet is connected to the hydraulic oil tank (1), and whose outlet is connected to the main oil circuit; The oil outlet pipeline of the variable pump (3) and the oil outlet pipeline of the gear pump (12) are connected to the same main oil circuit, and a first check valve (9) and a second check valve (10) are respectively set before the junction point. The outlets of the first check valve (9) and the second check valve (10) are connected to the downstream of the main oil circuit. The inlet of the main relief valve (4) is connected to the pipeline between the outlet of the variable pump (3) and the first check valve (9), and its return port is connected to the hydraulic oil tank (1). The inlet of the secondary overflow valve (11) is connected to the pipeline between the outlet of the gear pump (12) and the second check valve (10), and its return port is connected to the hydraulic oil tank (1).

2. The constant pressure hydraulic station with integrated emergency pump function according to claim 1, characterized in that: The main oil line is located downstream of the first check valve (9) and the second check valve (10), and a filter (6) and a pressure reducing valve group (8) are installed in sequence.

3. The constant pressure hydraulic station with integrated emergency pump function according to claim 1, characterized in that: A pressure sensor (5) and a pressure gauge (7) for detecting system pressure are also connected in parallel on the main oil line.

4. A constant pressure hydraulic station with integrated emergency pump function according to claim 1, characterized in that: The variable pump (3) is a constant pressure variable piston pump.

5. A constant pressure hydraulic station with integrated emergency pump function according to claim 2, characterized in that: The pressure reducing valve assembly (8) is an integrated valve block, which integrates a pressure reducing valve, a reversing valve and a pressure switch.

6. A constant pressure hydraulic station with integrated emergency pump function according to claim 1, characterized in that: The hydraulic oil tank (1) is equipped with an oil suction filter, an air filter, a level gauge and an oil drain valve.

7. A constant pressure hydraulic station with integrated emergency pump function according to claim 1, characterized in that: The main relief valve (4) is used to set the maximum working pressure of the variable pump (3), and the secondary relief valve (11) is used to set the maximum working pressure of the gear pump (12).

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