Hydraulic driving system of air compressor

Abstract

The utility model discloses an air compressor hydraulic driving system which comprises a hydraulic motor, an electromagnetic reversing valve A, an electromagnetic reversing valve B, an electromagnetic overflow valve, an oil inlet P and an oil return port T. The electromagnetic reversing valve A and the electromagnetic reversing valve B are connected between the oil inlet P and an oil inlet of the hydraulic motor in parallel, and the electromagnetic overflow valve is arranged between the oil inlet P and an oil outlet T. The utility model has the advantages of simple structure, accurate flow hierarchical control, dynamic unloading and pressure buildup optimization, strong adaptability and the like.

Description

Technical Field

[0001] This utility model relates to the field of air compressor drive technology, specifically an air compressor hydraulic drive system. Background Technology

[0002] Air compressors are a common air source for air circuit systems. Currently, most industrial air compressors are driven by electric motors. However, due to the thin air in high-altitude areas and the poor heat dissipation of electric motors, air compressors can only be used under certain altitude conditions. Moreover, many application scenarios do not have the conditions for high-voltage AC power supply, resulting in significant limitations in their use.

[0003] While there are existing air compressors driven by hydraulic motors, these typically use fixed flow rates or mechanical throttle valves for regulation, making it difficult to achieve precise flow rate control. This results in a limited range of air compressor speed adjustment, making it impossible to flexibly match different operating conditions. Furthermore, the lack of a rapid unloading function leads to significant hydraulic shocks when the motor starts or stops, affecting the lifespan of the air compressor's transmission components. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an air compressor hydraulic drive system that is simple in structure, provides precise flow classification control, optimizes dynamic unloading and pressure build-up, and is highly adaptable.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A hydraulic drive system for an air compressor, characterized in that it includes a hydraulic motor, a solenoid directional valve A, a solenoid directional valve B, a solenoid relief valve, an oil inlet P, and an oil return port T, wherein the solenoid directional valve A and the solenoid directional valve B are connected in parallel between the oil inlet P and the oil inlet of the hydraulic motor, and the solenoid relief valve is located between the oil inlet P and the oil outlet T.

[0007] The system uses an electromagnetic relief valve for unloading and pressure building, which saves energy, reduces consumption, and improves system reliability. Electromagnetic directional valves A and B can be opened individually or in combination to adjust the flow rate, thereby enabling the hydraulic motor to operate at high and low speeds.

[0008] The electromagnetic overflow valve of this invention has its main valve inlet port connected to the main valve inlet port P, and its main valve return port connected to the return port T. The built-in electromagnetic valve controls the opening and closing of the pilot oil circuit, thereby achieving unloading and pressure building.

[0009] A one-way throttle valve A is connected between the oil outlet of the electromagnetic reversing valve A and the oil inlet of the hydraulic motor in this utility model.

[0010] A one-way throttle valve B is connected between the oil outlet of the electromagnetic reversing valve B and the oil inlet of the hydraulic motor.

[0011] The control of one-way throttle valve A and one-way throttle valve B enables flow control and motion buffering.

[0012] The electromagnetic directional valves A and B described in this invention are driven by the output voltage signals of the loading and unloading solenoid valves of the air compressor. The loading and unloading solenoid valves are powered by the power module of the air compressor, thereby realizing gas-liquid linkage control.

[0013] This utility model also includes a cooling fan, which is powered by a power module;

[0014] The cooling fan is connected in series with the start switch, and then in parallel with the temperature control switch. In manual mode, the start switch controls the start and stop of the cooling fan, and in automatic mode, the temperature control switch controls the start and stop of the cooling fan to achieve air compressor cooling.

[0015] This utility model also includes a pressure switch, which detects the pressure of the main oil circuit of the hydraulic system and sends a signal to the controller; the pressure switch can monitor the pressure of the main oil circuit of the hydraulic system, and when the pressure is abnormal, the controller can control the air compressor to start and stop.

[0016] The output shaft of the hydraulic motor described in this invention is connected to the driving pulley, which is connected to the driven pulley via a belt. The driven pulley is connected to the screw compressor of the air compressor. The rotation of the hydraulic motor output shaft drives the screw compressor to rotate, thereby realizing the driving of the air compressor by the hydraulic motor.

[0017] The hydraulic motor of this invention has a shrink sleeve fitted on its output shaft, and the drive pulley is connected to the output shaft of the hydraulic motor via the shrink sleeve. The shrink sleeve enables a keyless connection, avoids shaft damage, and achieves high-precision alignment and torque transmission, while also facilitating maintenance.

[0018] The beneficial effects of this utility model are as follows: unloading and pressure building are achieved through the electromagnetic relief valve, and the electromagnetic directional valve A and electromagnetic directional valve B can be opened individually or in combination to adjust the flow rate, thereby realizing the high and low speed operation of the hydraulic motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the hydraulic system of this utility model.

[0020] Figure 2 This is a schematic diagram of the electrical system logic of this utility model.

[0021] Figure 3 This is a schematic diagram of the mechanical structure of this utility model.

[0022] Figure 4 This is a side view of the mechanical structure of this utility model.

[0023] Reference numerals: Hydraulic motor-1, oil inlet-101, oil outlet-102;

[0024] Electromagnetic relief valve-2;

[0025] Solenoid directional valve A-3;

[0026] Electromagnetic directional valve B-4;

[0027] One-way throttle valve A-5;

[0028] One-way throttle valve B-6;

[0029] Cooling fan -7;

[0030] Start switch -8;

[0031] Temperature control switch -9;

[0032] Pressure switch-10;

[0033] Controller-11;

[0034] Loading and unloading solenoid valves -12;

[0035] Driven pulley-1301, driven pulley-1302;

[0036] Belt-14;

[0037] Screw compressor main unit - 15;

[0038] Expansion sleeve-16. Detailed Implementation

[0039] The present invention will now be described in conjunction with the accompanying drawings and embodiments.

[0040] As attached Figure 3-4 As shown, the output shaft of the hydraulic motor 1 is connected to the drive pulley 1301, and the screw compressor 15 is connected to the driven pulley 1302. The belt 14 is fitted on the drive pulley 1301 and the driven pulley 1302. The rotation of the output shaft of the hydraulic motor 1 drives the drive pulley 1301 to rotate. The rotation of the drive pulley 1301 drives the driven pulley 1302 to rotate via the belt 14, thereby driving the screw compressor 15 to rotate, thus realizing the driving of the air compressor by the hydraulic motor 1. The structure of the air compressor is existing technology and will not be described in detail here.

[0041] The output shaft of the hydraulic motor 1 is fitted with a tension sleeve 16, and the drive pulley 1301 is connected to the output shaft of the hydraulic motor 1 via the tension sleeve 16. The tension sleeve 16 enables keyless connection, avoids shaft damage, and achieves high-precision alignment and torque transmission, while facilitating maintenance.

[0042] As attached Figure 1 As shown, a hydraulic drive system for an air compressor includes a hydraulic motor 1, a solenoid directional valve A3, a solenoid directional valve B4, a solenoid relief valve 2, an oil inlet P, and an oil outlet T. The solenoid directional valves A3 and B4 are connected in parallel between the oil inlet P and the oil inlet 101 of the hydraulic motor 1, and the solenoid relief valve 2 is located between the oil inlet P and the oil outlet T.

[0043] Unloading and pressure building are achieved through electromagnetic relief valve 2, which saves energy, reduces consumption, and improves system reliability. Electromagnetic directional valves A3 and B4 can be opened individually or in combination to adjust the flow rate, thereby enabling the hydraulic motor 1 to operate at high and low speeds.

[0044] The main valve inlet of the electromagnetic relief valve 2 is connected to the main valve inlet P, and the main valve return port is connected to the return port T. The built-in electromagnetic valve controls the opening and closing of the pilot oil circuit to achieve unloading and pressure building.

[0045] As attached Figure 1 As shown, when the built-in solenoid valve is de-energized, the solenoid relief valve 2 is in the unloaded state, the pilot oil circuit is connected, the main valve core is opened, and the hydraulic oil is directly bypassed from the oil inlet P to the oil return port T, so the system pressure cannot be established; when the built-in solenoid valve is energized, the solenoid relief valve 2 is in the pressure building state, the pilot oil circuit is cut off, the main valve core is closed, and the hydraulic oil flows from the oil inlet P to the hydraulic motor 1, driving it to operate.

[0046] A one-way throttle valve A5 is connected between the oil outlet of the electromagnetic reversing valve A3 and the oil inlet 101 of the hydraulic motor 1.

[0047] A one-way throttle valve B6 is connected between the oil outlet of the electromagnetic reversing valve B4 and the oil inlet 101 of the hydraulic motor 1.

[0048] The control of one-way throttle valves A5 and B6 enables flow control and motion buffering.

[0049] As attached Figure 1 As shown, when the solenoid directional valve A3 is energized, the P port and B port of the solenoid directional valve A3 are connected. The hydraulic oil in the oil tank enters the oil inlet 101 of the hydraulic motor 1 through the oil inlet P, the P port of the solenoid directional valve A3, the B port of the solenoid directional valve A3 and the throttle valve in sequence, and returns to the oil return port T from the oil outlet 102 of the hydraulic motor 1, and then flows back to the oil tank.

[0050] When the solenoid directional valve B4 is energized, the P port and B port of the solenoid directional valve B4 are connected. The hydraulic oil in the oil tank enters the oil inlet 101 of the hydraulic motor 1 through the oil inlet P, the P port of the solenoid directional valve B4, the B port of the solenoid directional valve B4 and the throttle valve in sequence, and returns to the oil return port T from the oil outlet 102 of the hydraulic motor 1, and then flows back to the oil tank.

[0051] Adjust the on / off state of solenoid directional valves A3 and B4 according to actual usage needs. When a large flow rate is required, both solenoid directional valves A3 and B4 are energized, and the two parallel oil circuits are fully opened to achieve a large flow rate output, driving hydraulic motor 1 to run at high speed, thereby achieving high-speed operation of the air compressor screw compressor. When a small flow rate is required, either solenoid directional valve A3 or solenoid directional valve B4 is energized according to actual needs to achieve a small flow rate output, driving hydraulic motor 1 to run at low speed, thereby achieving idle operation of the air compressor screw compressor.

[0052] As attached Figure 2 As shown, the system is powered by a 24V DC power supply. The loading solenoid valve, unloading solenoid valve, controller, and cooling fan are all powered by a 24V DC power supply. In this embodiment, the controller 11 has a display screen for display and operation.

[0053] In this embodiment, the controller outputs a 24V DC electrical signal to the electromagnetic relief valve 2 of the hydraulic system.

[0054] The electromagnetic reversing valves A3 and B4 are driven by the output voltage signals of the loading solenoid valve and unloading solenoid valve 12 of the air compressor to achieve gas-liquid linkage control.

[0055] The cooling fan 7 is connected in series with the start switch 10, and then in parallel with the temperature control switch 9. In manual mode, the start switch 10 controls the start and stop of the cooling fan 7, and in automatic mode, the temperature control switch 9 controls the start and stop of the cooling fan 7 to achieve air compressor heat dissipation.

[0056] This embodiment also includes a pressure switch 10, which detects the pressure of the main oil circuit of the hydraulic system and sends a signal to the controller; the pressure switch 10 can monitor the pressure of the main oil circuit of the hydraulic system, and when the pressure is abnormal, the controller can control the air compressor to start and stop.

[0057] In this embodiment, the pressure switch 10 is a normally closed pressure switch. When the pressure reaches the set overflow pressure, the pressure switch 10 is disconnected, the display screen shows overload alarm information, and the controller controls the solenoid overflow valve 2 to unload and disconnects the solenoid directional valve A3 and solenoid directional valve B4.

[0058] When using this utility model:

[0059] When the screw compressor 15 of the air compressor needs to operate at high speed, the solenoid directional valves A3 and B4 are energized simultaneously. The P port and B port of the solenoid directional valve A3 are connected, and the hydraulic oil in the oil tank enters the oil inlet 101 of the hydraulic motor 1 in sequence through the oil inlet P, the P port of the solenoid directional valve A3, the B port of the solenoid directional valve A3, and the throttle valve. The P port and B port of the solenoid directional valve B4 are connected, and the hydraulic oil in the oil tank enters the oil inlet 101 of the hydraulic motor 1 in sequence through the oil inlet P, the P port of the solenoid directional valve B4, the B port of the solenoid directional valve B4, and the throttle valve. The dual-path hydraulic oil drives the hydraulic motor 1 to rotate and returns from the oil outlet 102 of the hydraulic motor 1 to the return port T, and then flows back to the oil tank.

[0060] When the screw compressor 15 of the air compressor needs to operate at low speed, the solenoid directional valve A3 or solenoid directional valve B4 can be opened as needed.

[0061] When unloading is required, the controller de-energizes the built-in solenoid valve, the pilot oil circuit of the solenoid relief valve 2 is connected, the main valve core is opened, and the hydraulic oil is directly bypassed from the inlet P to the return port T; when pressure needs to be built up, the controller energizes the built-in solenoid valve, the pilot oil circuit is cut off, and the main valve core is closed.

[0062] Set the temperature threshold of the temperature control switch 9. In automatic mode, when the air compressor temperature exceeds the set threshold, the controller controls the temperature control switch 9 to open and the cooling fan 7 to start cooling the air compressor. In manual mode, manually turn off the start switch 8 and the cooling fan 7 will start cooling the air compressor.

[0063] When pressure switch 10 detects that the pressure in the main oil circuit of the hydraulic system is too high, it transmits a signal to the controller. The controller's display shows an overload alarm message. The controller controls the solenoid relief valve 2 to unload and disconnects the solenoid directional valves A3 and B4.

Claims

1. A hydraulic drive system for an air compressor, characterized in that: It includes a hydraulic motor, solenoid directional valve A, solenoid directional valve B, solenoid relief valve, oil inlet P and oil outlet T. Solenoid directional valve A and solenoid directional valve B are connected in parallel between oil inlet P and hydraulic motor inlet, and solenoid relief valve is located between oil inlet P and outlet T.

2. The hydraulic drive system for an air compressor according to claim 1, characterized in that: The main valve inlet of the electromagnetic relief valve is connected to the inlet P, and the main valve return port is connected to the return port T. The built-in electromagnetic valve controls the opening and closing of the pilot oil circuit.

3. A hydraulic drive system for an air compressor according to claim 1 or 2, characterized in that: A one-way throttle valve A is connected between the oil outlet of the electromagnetic reversing valve A and the oil inlet of the hydraulic motor. A one-way throttle valve B is connected between the oil outlet of the electromagnetic reversing valve B and the oil inlet of the hydraulic motor.

4. A hydraulic drive system for an air compressor according to claim 1 or 2, characterized in that: The electromagnetic reversing valves A and B are driven by the output voltage signals of the loading and unloading solenoid valves of the air compressor, and the loading and unloading solenoid valves are powered by the power module of the air compressor.

5. A hydraulic drive system for an air compressor according to claim 1 or 2, characterized in that: It is also equipped with a cooling fan, which is powered by a power module; The cooling fan is connected in series with the start switch, and then in parallel with the temperature control switch.

6. A hydraulic drive system for an air compressor according to claim 1 or 2, characterized in that: It is also equipped with a pressure switch, which detects the pressure of the main oil circuit of the hydraulic system and sends a signal to the controller.

7. A hydraulic drive system for an air compressor according to claim 1 or 2, characterized in that: The output shaft of the hydraulic motor is connected to the driving pulley, which is connected to the driven pulley via a belt. The driven pulley is connected to the screw compressor of the air compressor.

8. The hydraulic drive system for an air compressor according to claim 7, characterized in that: An expansion sleeve is fitted onto the output shaft of the hydraulic motor, and the drive pulley is connected to the output shaft of the hydraulic motor via the expansion sleeve.

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