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CN-224228913-U - Double-control fan speed regulating system and automobile crane

CN224228913UCN 224228913 UCN224228913 UCN 224228913UCN-224228913-U

Abstract

The utility model discloses a double-control fan speed regulating system and an automobile crane, wherein the double-control fan speed regulating system comprises a fan motor, a hydraulic pump and a pressure control assembly, the hydraulic pump is arranged as a constant pressure variable pump with variable output pressure ratio, the constant pressure variable pump comprises a pump body and a flow control assembly, the pump body is used for pumping hydraulic oil to the fan motor and is provided with a swash plate with adjustable output flow, the flow control assembly comprises a variable piston and a flow control valve, the variable piston is used for driving the swash plate, one chamber of the variable piston is communicated with an outlet of the pump body through a flow control oil way, the flow control valve is arranged on the flow control oil way, the pressure control assembly comprises a proportional pressure reducing valve, and the proportional pressure reducing valve is used for adjusting input oil pressure of the fan motor.

Inventors

  • ZHANG JIANJUN
  • HE WEI
  • LI WU

Assignees

  • 中联重科股份有限公司

Dates

Publication Date
20260512
Application Date
20250513

Claims (10)

  1. 1. A dual control fan speed control system, the dual control fan speed control system comprising: A fan motor (1); The hydraulic pump is arranged as a constant-pressure variable pump with variable output pressure proportion and comprises a pump body (2) and a flow control assembly (3), wherein the pump body (2) is used for pumping hydraulic oil to the fan motor (1) and is provided with a swash plate (21) with adjustable output flow, the flow control assembly (3) comprises a variable piston (31) and a flow control valve (33), the variable piston (31) is used for driving the swash plate (21), one chamber of the variable piston (31) is communicated with an outlet of the pump body (2) through a flow control oil way (32), and the flow control valve (33) is arranged on the flow control oil way (32); The pressure control assembly (4) comprises a proportional pressure reducing valve (41), an oil inlet of the proportional pressure reducing valve (41) is communicated with the pump body (2), a working oil port of the proportional pressure reducing valve (41) is communicated with an oil inlet of the fan motor (1), and the proportional pressure reducing valve (41) is used for adjusting the input oil pressure of the fan motor (1).
  2. 2. The dual control fan speed regulation system according to claim 1, wherein the fan motor (1) includes a first motor (11) and a second motor (12), the pressure control assembly (4) further includes an oil source switching valve (42), a first working port (a) and a second working port (B) of the oil source switching valve (42) are respectively communicated with oil inlets of the first motor (11) and the second motor (12), a first oil inlet (P1) and a second oil inlet (P2) of the oil source switching valve (42) are respectively communicated with working ports of the pump body (2) and the proportional pressure reducing valve (41), and the oil source switching valve (42) is used for selecting one of the first oil inlet (P1) and the second oil inlet (P2) to be communicated with the first working port (a) and the other to be communicated with the second working port (B).
  3. 3. The dual control fan speed regulation system according to claim 2, wherein the first motor (11) is a water cooled motor, the second motor (12) is an intercooler motor, the oil source switching valve (42) is a solenoid valve, and the oil source switching valve (42) is arranged to select the water cooled motor to be in direct communication with the pump body (2) in a power-off state, and to select the intercooler motor to be in direct communication with the pump body (2) in a power-on state.
  4. 4. A dual control fan speed regulation system according to claim 3, wherein the pressure control assembly (4) further comprises a controller and a temperature sensor, the temperature sensor is used for respectively detecting heat dissipation temperatures of the water cooling motor and the intercooler motor, the controller is respectively in communication connection with the temperature sensor and the oil source switching valve (42), and is used for controlling the oil source switching valve (42) to be powered on or powered off according to a detection result of the temperature sensor.
  5. 5. The dual control fan speed regulation system according to claim 1, wherein the number of the variable pistons (31) is two, one of the two variable pistons (31) is for driving the swash plate (21) in the forward direction, the other is for driving the swash plate (21) in the reverse direction, the flow control oil passage (32) includes a first branch (321) communicating with the rodless chamber of one of the variable pistons (31), and a second branch (322) communicating with the rodless chamber of the other variable piston (31), and the flow control valve (33) is provided on the second branch (322).
  6. 6. The dual control fan speed regulation system according to claim 5, wherein the flow control oil passage (32) further includes a third branch (323), the third branch (323) communicates with the first branch (321), and a proportional pressure valve (34) is provided on the third branch (323), the proportional pressure valve (34) is used for controlling oil pressure of the third branch (323), and the flow control valve (33) is used for adjusting an oil intake amount of the variable piston (31) connected with the second branch (322) according to a pressure difference between the second branch (322) and the third branch (323).
  7. 7. The dual control fan speed regulation system according to claim 6, wherein a first pressure guiding port (331) and a second pressure guiding port (332) for directly detecting a pressure difference are respectively arranged at two sides of the flow regulating valve (33), the first pressure guiding port (331) is communicated with the second branch (322), and the second pressure guiding port (332) is communicated with the third branch (323).
  8. 8. The dual control fan speed control system of claim 6 wherein the proportional pressure valve (34) is configured as an electronically controlled counter-proportional pressure valve.
  9. 9. The dual control fan speed regulation system according to any one of claims 1 to 8, further comprising an oil supplementing one-way valve (5), wherein an oil inlet of the oil supplementing one-way valve (5) is communicated with an oil return oil path of the fan motor (1), and an oil outlet of the oil supplementing one-way valve (5) is communicated with an oil inlet oil path between the proportional pressure reducing valve (41) and the fan motor (1).
  10. 10. A truck crane, characterized in that it comprises a double control fan speed regulation system according to any one of claims 1 to 9.

Description

Double-control fan speed regulating system and automobile crane Technical Field The utility model belongs to the technical field of engineering machinery, and particularly relates to a double-control fan speed regulating system and an automobile crane. Background The heat dissipation system of the automobile crane generally comprises an intercooling heat dissipation system and a water cooling heat dissipation system, wherein the intercooling heat dissipation system is used for meeting the heat dissipation requirement of an engine air inlet system, and the water cooling heat dissipation system is used for meeting the heat dissipation requirement of an engine body and the re-addition of functions such as hydraulic torque conversion heat dissipation, hydraulic retarding heat dissipation and the like. The intercooling heat dissipation system and the water cooling heat dissipation system generally adopt a fan driving heat dissipation structure, the fan is driven by a hydraulic motor, and the heat dissipation capacity of the system is adjusted by controlling the rotating speed of the hydraulic motor. In the prior art, a valve control speed regulating system is generally adopted for a hydraulic motor, and mainly the valve control speed regulating system comprises a quantitative gear pump, an electric proportional pressure valve and a quantitative motor, wherein the quantitative gear pump, the electric proportional pressure valve and the quantitative motor are arranged in one scheme, the driving pressure is controlled through the electric proportional pressure valve so as to regulate the rotating speed of the motor, and the constant pressure variable pump, the speed regulating valve group and the quantitative motor are arranged in the other scheme, and the input flow is controlled through the speed regulating valve group so as to regulate the rotating speed of the motor. However, in the practical use process, both schemes can only realize single control on flow or pressure, which can cause larger power loss. Disclosure of utility model Aiming at the defects or shortcomings, the utility model provides a double-control fan speed regulating system and an automobile crane, and aims to solve the technical problem of large power loss caused by the existing heat dissipation system. In order to achieve the above purpose, the first aspect of the utility model provides a dual-control fan speed regulating system, wherein the dual-control fan speed regulating system comprises a fan motor, a hydraulic pump and a pressure control assembly, the hydraulic pump is a constant pressure variable pump with variable output pressure, the constant pressure variable pump comprises a pump body and a flow control assembly, the pump body is used for pumping hydraulic oil to the fan motor and is provided with a swash plate with adjustable output flow, the flow control assembly comprises a variable piston and a flow control valve, the variable piston is used for driving the swash plate, one chamber of the variable piston is communicated with an outlet of the pump body through a flow control oil way, the flow control valve is arranged on a flow control oil way, the pressure control assembly comprises a proportional pressure reducing valve, an oil inlet of the proportional pressure reducing valve is communicated with the pump body, a working oil port of the proportional pressure reducing valve is communicated with an oil inlet of the fan motor, and the proportional pressure reducing valve is used for adjusting the input oil pressure of the fan motor. In the embodiment of the utility model, the fan motor comprises a first motor and a second motor, the pressure control assembly further comprises an oil source switching valve, a first working oil port and a second working oil port of the oil source switching valve are respectively communicated with oil inlets of the first motor and the second motor, a first oil inlet and a second oil inlet of the oil source switching valve are respectively communicated with the working oil ports of the pump body and the proportional pressure reducing valve, and the oil source switching valve is used for selecting one of the first oil inlet and the second oil inlet to be communicated with the first working oil port and the other one to be communicated with the second working oil port. In the embodiment of the utility model, the first motor is a water-cooled motor, the second motor is an intercooling motor, the oil source switching valve is an electromagnetic valve, and the oil source switching valve is arranged to select the water-cooled motor to be directly communicated with the pump body in a power-off state and select the intercooling motor to be directly communicated with the pump body in a power-on state. In the embodiment of the utility model, the pressure control assembly further comprises a controller and a temperature sensor, wherein the temperature sensor is used for respectively detecting the heat dissipat