Overflow valve loss energy recovery and application system, hydraulic system and loader
By designing the energy recovery application system for the loss of the relief valve, the energy lost by the main relief valve is collected and stored by the accumulator, and emergency energy is provided when the oil pressure in the steering system is insufficient, the problem of energy waste in the loader hydraulic system is solved and the efficient utilization of energy is achieved.
Patent Information
- Application Number
- CN202420748046.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-11
AI Technical Summary
In the hydraulic system of the loader, the main overflow valve opens at a high frequency, resulting in large energy loss of overflow and waste of energy.
Design an application system for energy recovery of the loss of the relief valve, including the energy storage oil circuit and the energy accumulator, and collect the energy lost by the main relief valve through the energy storage oil circuit and store it in the energy storage accumulator. When the normal oil pressure of the steering system cannot be established, the hydraulically controlled on-off valve is controlled using elastic parts to conduct the accumulator and the steering system oil circuit to provide emergency energy.
The main overflow valve is recovered and utilized, which avoids a large amount of energy waste and improves the energy utilization efficiency of the hydraulic system.
Smart Images
Figure CN222615744U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering machinery, and in particular to a relief valve lost energy recovery application system, a hydraulic system and a loader. Background Art
[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.
[0003] The hydraulic circuit limit pressure of the loader working system is 340bar, and the steering system hydraulic circuit limit pressure is 260bar. When the load force in the working system hydraulic circuit is large, the main overflow valve connected to the working system hydraulic circuit opens after the hydraulic system working pressure reaches 340bar. The outlet of the main overflow valve is connected to the oil tank, and the oil overflows back to the oil tank. The overflow part of the power loss is the pressure difference before and after the overflow valve X flow. Since the outlet of the overflow valve is connected to the oil tank, the outlet pressure is negligible, so the overflow loss power is F = 34*q / 60KW. Since the overflow valve is opened frequently during the operation of the loader, the system has a high accumulated overflow loss energy, resulting in a large amount of energy waste. Utility Model Content
[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a relief valve lost energy recovery application system, a hydraulic system and a loader, which can realize the recovery and utilization of the energy lost by the main relief valve and avoid energy waste.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] In the first aspect, an embodiment of the utility model provides an overflow valve loss energy recovery application system, including an energy storage oil circuit, the energy storage oil circuit is connected to an accumulator, the oil inlet end of the energy storage oil circuit is used to be connected to the outlet of a main overflow valve connected to the working system oil circuit, the oil outlet end of the energy storage oil circuit is connected to the oil inlet of a hydraulically controlled on-off valve, the oil outlet of the hydraulically controlled on-off valve is used to be connected to the steering system oil circuit, one end of the control channel of the hydraulically controlled on-off valve is used to be connected to the steering system oil circuit, and the other end is provided with an elastic member, which is connected to the valve core in the control channel of the hydraulically controlled on-off valve.
[0007] Optionally, a first one-way valve is installed on the energy storage oil circuit upstream of the accumulator so that the hydraulic oil can only flow from the main overflow valve to the accumulator.
[0008] Optionally, the energy storage oil circuit downstream of the accumulator is also connected to a secondary overflow valve, and the outlet of the secondary overflow valve is connected to the oil tank through the oil circuit.
[0009] Optionally, the rated working pressure of the secondary relief valve is not greater than the rated pressure of the accumulator.
[0010] Optionally, a second one-way valve is provided at the oil circuit interface of the hydraulic switch valve connected to the steering system oil circuit so that the hydraulic oil can only flow from the hydraulic switch valve to the steering system oil circuit.
[0011] Optionally, the maximum elastic force of the elastic member is equal to the rated pressure of the accumulator and is less than the rated working pressure of the overflow valve in the steering system oil circuit.
[0012] Optionally, the elastic member is a spring, one end of which is connected to the valve core of the on-off valve, and the other end is fixedly arranged.
[0013] Optionally, the hydraulically controlled on-off valve adopts a hydraulically controlled two-position two-way cut-off valve.
[0014] In the second aspect, an embodiment of the utility model provides a hydraulic system, including a relief valve loss energy recovery application system as described in the first aspect, and also including a working system oil circuit and a steering system oil circuit, wherein the oil inlet end of the energy storage oil circuit is connected to the outlet of the main relief valve connected to the working system oil circuit, one end of the control channel of the hydraulically controlled on-off valve is connected to the steering system oil circuit through the control oil circuit, and the oil outlet of the hydraulically controlled on-off valve is connected to the steering system oil circuit through the oil circuit.
[0015] In a third aspect, an embodiment of the present utility model provides a loader provided with the hydraulic system described in the second aspect.
[0016] The beneficial effects of the above utility model are as follows:
[0017] The utility model discloses an energy recovery application system for a relief valve loss, comprising an energy storage oil circuit, wherein the energy storage oil circuit is provided with an accumulator, an oil inlet end of the energy storage oil circuit is used to connect to an outlet of a main relief valve, the accumulator can recover the energy lost by the main relief valve, an outlet end of the energy storage oil circuit is connected to an oil inlet of a hydraulically controlled on-off valve, an oil outlet of the hydraulically controlled on-off valve is used to connect to a steering system oil circuit, one end of a control channel of a hydraulically controlled channel valve is used to connect to a steering system oil circuit, and an elastic member connected to a valve core is provided at the other end, when the working system oil circuit and the steering system oil circuit are in normal working state, the accumulator can recover the energy lost by the main relief valve through the energy storage oil circuit, the oil pressure in the steering system oil circuit makes the hydraulically controlled on-off valve in a disconnected state, when the steering system oil circuit cannot normally establish oil pressure, the hydraulically controlled on-off valve is opened under the action of the elastic member, so that the accumulator is connected to the steering system oil circuit, the accumulator provides emergency energy to the steering system oil circuit through the energy storage oil circuit, thereby realizing the utilization of the energy lost by the main relief valve and avoiding a large amount of energy wasted by the main relief valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.
[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;
[0020] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;
[0021] Among them, 1. accumulator, 2. main overflow valve, 3. auxiliary overflow valve, 4. oil tank, 5. steering system overflow valve, 6. first one-way valve, 7. second one-way valve, 8. hydraulically controlled two-position two-way cut-off valve, 9. control oil circuit, 10. spring, 11. working pump, 12. steering pump, 13. hydraulic pressure switch. DETAILED DESCRIPTION
[0022] Example 1
[0023] The present embodiment provides an overflow valve loss energy recovery application system, comprising an energy storage oil circuit, an accumulator 1 is installed on the energy storage oil circuit, the oil inlet end of the energy storage oil circuit is used to connect to the outlet of the main overflow valve 2 connected to the working system oil circuit, and the outlet of the energy storage oil circuit is connected to the hydraulically controlled on-off valve, the energy storage oil circuit is connected to the accumulator 1 for collecting the overflow capacity of the main overflow valve 2, the oil inlet of the hydraulically controlled on-off valve is connected to the oil outlet end of the energy storage oil circuit, and the oil outlet is used to connect to the steering system oil circuit, one end of the control channel of the hydraulically controlled on-off valve is used to connect to the steering system oil circuit, and the other end of the control channel is provided with an elastic member, the elastic member is connected to the valve core of the hydraulically controlled on-off valve, the steering system oil circuit and the elastic member can jointly control the movement of the valve core in the hydraulically controlled on-off valve, thereby realizing the switching of the on and off states of the oil inlet and oil outlet of the hydraulically controlled on-off valve, and the energy storage oil circuit downstream of the accumulator 1 is also connected to an auxiliary overflow valve 3 through the oil circuit, and the auxiliary overflow valve 3 is connected to the oil tank 4.
[0024] The rated pressure of the accumulator 1 is less than the rated working pressure of the main overflow valve 2, and the rated pressure of the accumulator 1 is also less than the rated working pressure of the steering system overflow valve 5 connected to the steering system oil circuit. In this embodiment, the rated working pressure of the main overflow valve 2 is 340 bar, and the rated working pressure of the steering system overflow valve 5 connected to the steering system oil circuit is 260 bar. Preferably, the rated pressure of the accumulator 1 is 200 bar.
[0025] The inlet of the auxiliary relief valve 3 is connected to the energy storage oil circuit downstream of the accumulator 1, and the outlet thereof is connected to the oil tank 4. The rated working pressure of the auxiliary relief valve 3 is the same as the rated pressure of the accumulator 1, which is 200 bar, and plays the role of limiting the oil pressure, thereby preventing the accumulator 1 from being damaged due to excessive pressure.
[0026] The energy storage oil circuit upstream of the accumulator 1 is installed with a first one-way valve 6, and the first one-way valve 6 can only allow oil to flow from the main overflow valve 2 to the accumulator 1, thereby avoiding the backflow of oil.
[0027] A second one-way valve 7 is installed at the oil outlet of the hydraulically controlled on-off valve. The second one-way valve 7 only allows the oil to flow to the steering system oil circuit through the hydraulically controlled channel valve, thereby avoiding the backflow of the oil.
[0028] The hydraulically controlled on-off valve adopts the existing hydraulically controlled two-position two-way cut-off valve 8, including an outer shell, a control channel inside the outer shell, the control channel is connected to the oil inlet and the oil outlet, a valve core that can move along its axial direction is provided in the control channel, the end of the control channel on one side of the valve core is used to connect to the steering system oil circuit through the control oil circuit 9, and an elastic member is provided on the other side of the control channel, the elastic member adopts a spring 10, one end of the spring 10 is connected to the valve core, and the other end is fixedly arranged. Preferably, the other end of the spring 10 is fixed to the outer shell. The two-position two-way cut-off valve 8 can adopt the existing valve, and its further technical details are not described in detail here.
[0029] Preferably, the maximum elastic force of the spring 10 is equal to the rated pressure of the accumulator 1, which is 200 bar.
[0030] The hydraulic oil in the steering system oil circuit can enter the control channel on one side of the valve core through the oil circuit, so that one side of the valve core is affected by the oil pressure and the other side is affected by the elastic force of the spring 10. Under the action of the oil pressure and the elastic force, the valve core can move in the control channel, thereby realizing the switching of the on and off states of the oil inlet and outlet.
[0031] Specifically, when the steering system oil circuit can establish normal oil pressure, under the action of the oil pressure, the valve core overcomes the elastic force of the spring 10 and moves to the cut-off position. At this time, the oil inlet and the oil outlet are disconnected, and the accumulator cannot supply oil to the steering system oil circuit through the energy storage oil circuit. When the steering system oil circuit cannot establish normal oil pressure, under the action of the elastic force of the spring 10, the valve core moves to the conduction position. At this time, the oil inlet and the oil outlet are connected, and the accumulator 1 supplies oil to the steering system oil circuit through the energy storage oil circuit.
[0032] Example 2
[0033] The present embodiment provides a hydraulic system for installation on a loader, wherein the hydraulic system includes a working system oil circuit and a steering system oil circuit, wherein the working system oil circuit is connected to a working pump 11, which is connected to an oil tank 4, and the steering system oil circuit is connected to a steering pump 12, which is connected to an oil tank 4. The working system oil circuit downstream of the working pump 11 is connected to a main overflow valve 2, and the steering system oil circuit downstream of the steering pump 12 is connected to a steering system overflow valve 5.
[0034] The arrangement and connection of the various components of the above hydraulic system can adopt the technology of the existing hydraulic system of the loader, and no further detailed description is given here.
[0035] The hydraulic system also includes a relief valve loss energy recovery application system as described in Example 1, wherein the oil inlet end of the energy storage oil circuit is connected to the outlet of the main relief valve 2, and a first one-way valve 6 is installed between the main relief valve 2 and the accumulator 1, so that the hydraulic oil can only flow from the main relief valve 2 to the accumulator 1, and the oil outlet of the hydraulically controlled two-position two-way cut-off valve 8 is provided with a second one-way valve 7, and the oil outlet end of the second one-way valve 7 is connected to the steering system oil circuit downstream of the steering pump 12 through an oil circuit, and one end of the control channel of the hydraulically controlled two-position two-way cut-off valve 8 is connected to the steering system oil circuit downstream of the steering pump 12 through a control oil circuit 9.
[0036] The working method of this embodiment is:
[0037] Under normal working conditions, the hydraulic oil flowing out of the main overflow valve 2 enters the energy storage oil circuit, and the overflow energy is collected by the accumulator 1.
[0038] When the normal oil pressure can be established in the steering system oil circuit, the valve core disconnects the oil inlet and outlet of the hydraulically controlled two-position two-way cut-off valve 8 under the action of the oil pressure.
[0039] When the steering system oil circuit cannot establish normal oil pressure, under the elastic force of the spring 10, the valve core moves to connect the oil inlet and oil outlet of the hydraulically controlled two-position two-way cut-off valve 8. At this time, the accumulator 1 can provide hydraulic oil to the steering system oil circuit through the energy storage oil circuit, thereby providing emergency energy for the steering system oil circuit, thereby realizing the utilization of the lost energy of the main overflow valve 2 and avoiding a large amount of wasted energy of the main overflow valve.
[0040] Example 3
[0041] This embodiment provides a hydraulic system. Compared with Embodiment 2, the only difference is that the steering system oil circuit downstream of the steering pump is connected to a hydraulic pressure switch 13. The hydraulic pressure switch 13 can use existing equipment and will not be described in detail here. The hydraulic pressure switch 13 is connected to the power supply circuit of the alarm device 14. The alarm device 14 can use existing equipment, such as a buzzer alarm or an alarm light, etc., and those skilled in the art can set it according to actual needs. The rated working pressure of the hydraulic pressure switch 13 is 3 bar. When the hydraulic pressure switch 13 detects that the pressure in the steering system oil circuit is less than 3 bar, the power supply circuit of the alarm device 14 is turned on, and the alarm device works to alarm a fault.
[0042] The remaining structures of Example 3 are the same as those of Example 2 and will not be described again here.
[0043] Example 4
[0044] This embodiment provides a loader, which is equipped with the hydraulic system described in Embodiment 2 or Embodiment 3. The remaining structure of the loader can adopt the existing technology and will not be described in detail here.
[0045] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. A spill valve loss energy recovery application system, characterized in that: It includes an energy storage oil circuit, which is connected to an accumulator. The oil inlet end of the energy storage oil circuit is used to be connected to the outlet of a main overflow valve connected to the working system oil circuit, and the oil outlet end of the energy storage oil circuit is connected to the oil inlet of a hydraulically controlled on-off valve. The oil outlet of the hydraulically controlled on-off valve is used to be connected to the steering system oil circuit. One end of the control channel of the hydraulically controlled on-off valve is used to be connected to the steering system oil circuit, and the other end is provided with an elastic member, which is connected to the valve core in the control channel of the hydraulically controlled on-off valve.
2. The overflow valve loss energy recovery application system according to claim 1, characterized in that: A first one-way valve is installed on the energy storage oil circuit upstream of the accumulator so that the hydraulic oil can only flow from the main overflow valve to the accumulator.
3. The overflow valve loss energy recovery application system according to claim 1, characterized in that: The energy storage oil circuit downstream of the accumulator is also connected to a secondary overflow valve, and the outlet of the secondary overflow valve is connected to the oil tank through the oil circuit.
4. The overflow valve loss energy recovery application system as claimed in claim 3, characterized in that: The rated working pressure of the secondary relief valve is not greater than the rated pressure of the accumulator.
5. The overflow valve loss energy recovery application system as claimed in claim 1, characterized in that: The hydraulically controlled on-off valve is provided with a second one-way valve at the oil circuit interface connected to the steering system oil circuit so that the hydraulic oil can only flow from the hydraulic switch valve to the steering system oil circuit.
6. The overflow valve loss energy recovery application system as claimed in claim 1, characterized in that: The maximum elastic force of the elastic member is equal to the rated pressure of the accumulator and is less than the rated working pressure of the overflow valve in the steering system oil circuit.
7. The overflow valve loss energy recovery and application system as claimed in claim 1, characterized in that: The elastic member is a spring, one end of which is connected to the valve core of the hydraulically controlled on-off valve, and the other end is fixedly arranged.
8. The overflow valve loss energy recovery and application system as claimed in claim 1, characterized in that: The hydraulically controlled on-off valve adopts a hydraulically controlled two-position two-way cut-off valve.
9. A hydraulic system, characterized in that: It comprises an overflow valve loss energy recovery application system as described in any one of claims 1 to 8, and also comprises a working system oil circuit and a steering system oil circuit, wherein the oil inlet end of the energy storage oil circuit is connected to the outlet of the main overflow valve connected to the working system oil circuit, one end of the control channel of the hydraulically controlled on-off valve is connected to the steering system oil circuit through the control oil circuit, and the oil outlet of the hydraulically controlled on-off valve is connected to the steering system oil circuit through the oil circuit.
10. A loader, characterized in that: A hydraulic system according to claim 9 is provided.