CN108825574B - Hydraulic balance valve automatically adapting to load change and flow change - Google Patents
Hydraulic balance valve automatically adapting to load change and flow change Download PDFInfo
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- CN108825574B CN108825574B CN201810803960.XA CN201810803960A CN108825574B CN 108825574 B CN108825574 B CN 108825574B CN 201810803960 A CN201810803960 A CN 201810803960A CN 108825574 B CN108825574 B CN 108825574B
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- valve
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- load
- control piston
- controllable throttle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
Abstract
The invention discloses a hydraulic balance valve capable of automatically adapting to load change and flow change, wherein a valve body of the hydraulic balance valve is provided with an oil port A, an oil port B and a control oil port K, a hydraulic control one-way valve, a flow detection valve and a controllable throttle valve are sequentially connected in series from top to bottom and are connected in parallel with the one-way valve, the opening area of the controllable throttle valve is controlled by a flow control piston and a load control piston, two ends of the flow control piston are respectively connected with an inlet and an outlet of the flow detection valve, and a piston cavity of the load control piston is communicated with the oil port A; the opening area of the controllable throttle valve is increased under the action of the flow control piston along with the increase of the passing flow, so that the back pressure generated by the controllable throttle valve is matched with the load; the invention realizes the hydraulic balance of load and flow change by adding the flow detection valve and the flow control piston and automatically generating the back pressure matched with the load when the flow changes.
Description
Technical Field
The invention relates to a hydraulic balance valve, in particular to a hydraulic cylinder control balance valve which is vertically or obliquely arranged in various open hydraulic circuits in engineering machinery.
Background
The hydraulic balance valve is characterized in that a hydraulic balance valve is arranged on a downward loop of a vertical hydraulic cylinder to prevent accidents or impacts caused by self falling of the hydraulic cylinder and a working component which are vertically or obliquely installed due to self weight, a proper resistance is arranged on a downward loop of the vertical hydraulic cylinder to generate certain backpressure and gravity load balance to prevent the hydraulic cylinder from descending in an accelerated manner, the loop is a balance loop, the improvement, the positioning and descending of the hydraulic balance loop control load directly affect the performance of the whole machine, if the hydraulic balance valve is not designed reasonably, the operation of the equipment is limited, and the stability of the whole machine is adversely affected, in the hydraulic balance loop, the loop function is realized by widely adopting the hydraulic balance valve, the balance valve used at present generally has the problems of high control pressure, incapability of accurately changing along with the change of the load, poor working stability, serious system power loss and the like, and for the problems, a patent of a hydraulic balance valve which automatically adapts to the change of load change (patent No. Z200610happy 102007.X, inventor: Yaohanping, Zhaojie, Zhang, Mianjuan, Zhang, Miyao, Zhang, Miao, Mi.
Disclosure of Invention
The object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide a hydraulic balance valve which reduces the control pressure over a wide load variation range and a wide flow variation range, and whose back pressure is automatically adapted to the load and flow variations.
The specific technical scheme is as follows.
A kind of hydraulic balance valve adapting load change and flow change automatically, including pilot operated check valve, controllable throttle valve, check valve and load control piston; the method is characterized in that:
a flow detection valve and a flow control piston are additionally arranged in the hydraulic balance valve, and the flow change is converted into a differential pressure signal through the flow detection valve to act on two ends of the flow control piston; the valve body is sequentially provided with a first oil port A, a control oil port K and a second oil port B, and meanwhile, a hydraulic control one-way valve, a flow detection valve and a controllable throttle valve are sequentially connected in series from top to bottom and are connected in parallel with the one-way valve; a piston cavity of the load control piston is communicated with the first oil port A; the opening area of the valve port of the controllable throttle valve is reduced under the action of the load control piston along with the increase of the load, so that the back pressure generated by the controllable throttle valve is matched with the load; the opening area of the valve port of the controllable throttle valve is increased under the action of the flow control piston along with the increase of the passing flow, so that the back pressure generated by the controllable throttle valve is matched with the load.
Further additional technical features are as follows.
The opening area of the controllable throttle valve is hyperbolic in relation to the pressure acting on the load control piston.
The opening area of the controllable throttle valve is changed under the combined action of the load control piston and the flow control piston; when the load is increased, the opening area of the controllable throttle valve is reduced; when the load is reduced, the opening area of the controllable throttle valve is increased; when the flow is increased, the opening area of the controllable throttle valve is increased; when the flow is reduced, the opening area of the controllable throttle valve is reduced.
The load control piston and the flow control piston are independently controlled or controlled by a composite structure.
The hydraulic control one-way valve and the one-way valve are cone valve structures.
Compared with the prior art, the invention has the following beneficial effects.
The balance valve can effectively adapt to the change of the load, and the valve can well adapt to a system with constant load or a system with variable load; by adopting the balance valve, the size of the area of the throttling opening of the controllable throttle valve can be automatically adjusted according to load change, and the balance valve can automatically and stably descend completely depending on the dead weight and the load weight; by adopting the balance valve, when the flow of the system changes, the flow change is converted into a differential pressure signal through the flow detection valve to act on two ends of the flow control piston, so that the size of the area of the throttling port of the controllable throttle valve is adjusted, and the back pressure generated by the balance valve is not changed due to the change of the flow; the hydraulic control one-way valve and the one-way valve adopt a cone valve structure, so that leakage can be effectively prevented when a load is static, a heavy object is prevented from falling under the action of self weight, and safe operation is ensured; the valve is easy to process because the valve is composed of the most commonly used cone valve and slide valve; the valve can adapt to different system flow ranges and has a wider application range; when the heavy object rises, the flow only passes through the one-way valve, so the whole process has small liquid resistance, small energy loss and high efficiency.
Drawings
Fig. 1 is a schematic diagram of the structure of the balance valve.
Fig. 2 is a schematic diagram of the overall structure of the balance valve.
Fig. 3 shows a use condition of the balance valve in a vertically moving oil cylinder.
In the figure: 1: a hydraulic control check valve; 2: a flow detection valve; 3: a controllable throttle valve; 4: a one-way valve; 5: a flow control piston: 6: a load control piston; a: a first oil port; b: a second oil port; k: and controlling the oil port.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 to fig. 3, the hydraulic balance valve automatically adapting to load change and flow change provided by the present invention includes a hydraulic control check valve 1, a flow detection valve 2, a controllable throttle valve 3, a check valve 4, a flow control piston 5 and a load control piston 6; the hydraulic balance valve is additionally provided with a flow detection valve 2 and a flow control piston 5, and the flow detection valve 2 converts the change of flow into a differential pressure signal to act on two ends of the flow control piston 5; a first oil port A, a control oil port K and a second oil port B are sequentially formed in the left side of the valve body, meanwhile, a hydraulic control one-way valve 1, a flow detection valve 2 and a controllable throttle valve 3 are sequentially connected in series from top to bottom on the right side of the valve body and are connected in parallel with a one-way valve 4, the opening area of the controllable throttle valve 3 is controlled by a flow control piston 5 and a load control piston 6, two ends of the flow control piston 5 are respectively communicated with an inlet and an outlet of the flow detection valve 2, and a piston cavity of the load control piston 6 is communicated with the first oil port A; the opening area of the valve port of the controllable throttle valve 3 is reduced under the action of the load control piston 6 along with the increase of the load, so that the back pressure generated by the controllable throttle valve 3 is matched with the load; when the flow passing through the balance valve is increased, a larger pressure drop is generated at two ends of the flow detection valve 2, the flow control piston 5 acts on the controllable throttle valve 3, the valve port opening area of the controllable throttle valve 3 is increased, and therefore the back pressure generated by the balance valve is matched with the load; when the flow passing through the balance valve is reduced, a small pressure drop is generated at two ends of the flow detection valve 2, the flow control piston 5 acts on the controllable throttle valve, the valve port opening area of the controllable throttle valve 3 is reduced, and therefore the back pressure generated by the balance valve is matched with the load.
In the above-described embodiment, the opening area of the throttle valve 3 and the pressure applied to the load control piston 6 are hyperbolically related, and satisfy the flow equation
(wherein A is the opening area of the controllable throttle valve 3 and p is the pressure acting on the load control piston 6), so that the flow q is substantially constant and the hydraulic cylinder descends smoothly; the opening surface of the controllable throttle valve 3 is changed under the combined action of the load control piston 6 and the flow control piston 5; when the load increases, the opening area of the controllable throttle valve 3 decreases; when the load is reduced, the opening area of the controllable throttle valve 3 is increased; when the flow rate is increased, the opening area of the controllable throttle valve 3 is increased; when the flow rate decreases, the opening area of the controllable throttle valve 3 decreases.
In the above-described embodiments, the load control piston 6 and the flow control piston 5 may be independent from each other, or may be of a composite structure, as long as the operation principles are consistent.
As shown in figure 3, the balance valve is used in a vertical motion oil cylinder.
When the oil cylinder moves upwards, oil enters the lower cavity of the oil cylinder from the first oil port A through the second oil port B and the check valve 4, and the oil cylinder is lifted.
When the oil cylinder bears a load and is static, the lower cavity is under the action of load pressure, the hydraulic control one-way valve 1 and the one-way valve 4 are closed, and the hydraulic control one-way valve 1 and the one-way valve 4 adopt cone valve structures, so that the sealing performance is good, and the load can be kept immovable at any position.
When the oil cylinder moves downwards, oil enters an upper cavity of the oil cylinder, the hydraulic control one-way valve 1 is opened under the action of control pressure (pressure of a control oil port K), oil in a lower cavity flows through the hydraulic control one-way valve 1, the flow detection valve 2 and the controllable throttle valve 3 and returns to the oil tank, the opening area of the controllable throttle valve 3 is controlled by pressure (pressure of a first oil port A) generated by a load through the load control piston 6, and the opening area of the controllable throttle valve 3 is reduced along with the increase of the load, so that back pressure generated by the balance valve is matched with the load, and the stable downward movement of the oil cylinder is realized; when the flow increases, the pressure drop generated by the flow detection valve 2 increases, and the flow control piston 5 acts on the controllable throttle valve 3 to increase the opening area of the controllable throttle valve 3, so that the back pressure generated by the balance valve is matched with the load flow, and the stable descending of the oil cylinder is realized.
Claims (5)
1. A hydraulic balance valve capable of automatically adapting to load change and flow change comprises a hydraulic control one-way valve (1), a controllable throttle valve (3), a one-way valve (4) and a load control piston (6); the method is characterized in that:
a flow detection valve (2) and a flow control piston (5) are additionally arranged in the hydraulic balance valve, and the flow change is converted into a differential pressure signal through the flow detection valve (2) to act on two ends of the flow control piston (5); a first oil port (A), a control oil port (K) and a second oil port (B) are sequentially formed in the valve body, meanwhile, a hydraulic control one-way valve (1), a flow detection valve (2) and a controllable throttle valve (3) are sequentially connected in series from top to bottom and are connected in parallel with a one-way valve (4), the opening area of the controllable throttle valve (3) is controlled by a flow control piston (5) and a load control piston (6), and two ends of the flow control piston (5) are respectively communicated with an inlet and an outlet of the flow detection valve (2); a piston cavity of the load control piston (6) is communicated with the first oil port (A); the opening area of the valve port of the controllable throttle valve (3) is reduced under the action of the load control piston (6) along with the increase of the load, so that the back pressure generated by the controllable throttle valve (3) is matched with the load; the opening area of the valve port of the controllable throttle valve (3) is increased under the action of the flow control piston (5) along with the increase of the passing flow, so that the back pressure generated by the controllable throttle valve (3) is matched with the load.
2. The hydraulic balancing valve for automatically adapting to load changes and flow changes of claim 1, wherein: the opening area of the controllable throttle valve (3) is hyperbolic in relation to the pressure acting on the load control piston.
3. The hydraulic balancing valve for automatically adapting to load changes and flow changes of claim 1, wherein: the opening area of the controllable throttle valve (3) is changed under the combined action of the load control piston (6) and the flow control piston (5); when the load is increased, the opening area of the controllable throttle valve (3) is reduced; when the load is reduced, the opening area of the controllable throttle valve (3) is increased; when the flow is increased, the opening area of the controllable throttle valve (3) is increased; when the flow rate is reduced, the opening area of the controllable throttle valve (3) is reduced.
4. The hydraulic balancing valve for automatically adapting to load changes and flow changes of claim 1, wherein: the load control piston (6) and the flow control piston (5) are independently controlled or controlled by a composite structure.
5. The hydraulic balancing valve for automatically adapting to load changes and flow changes of claim 1, wherein: the hydraulic control one-way valve (1) and the one-way valve (4) are cone valve structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810803960.XA CN108825574B (en) | 2018-07-20 | 2018-07-20 | Hydraulic balance valve automatically adapting to load change and flow change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810803960.XA CN108825574B (en) | 2018-07-20 | 2018-07-20 | Hydraulic balance valve automatically adapting to load change and flow change |
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| Publication Number | Publication Date |
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| CN108825574A CN108825574A (en) | 2018-11-16 |
| CN108825574B true CN108825574B (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810803960.XA Active CN108825574B (en) | 2018-07-20 | 2018-07-20 | Hydraulic balance valve automatically adapting to load change and flow change |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111271330A (en) * | 2020-01-21 | 2020-06-12 | 西安航空学院 | Direct-acting electric control one-way valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2115952A (en) * | 1982-02-26 | 1983-09-14 | Rexroth Mannesmann Gmbh | Balanced pressure valve |
| DE4134575A1 (en) * | 1990-10-18 | 1992-04-23 | Caterpillar Mitsubishi Ltd | PRESSURE COMPENSATION VALVE, ESPECIALLY PRE-CONTROLLED PRESSURE COMPENSATION FOLLOW VALVE (LOGICAL VALVE) |
| CN1945028A (en) * | 2006-10-10 | 2007-04-11 | 太原理工大学 | Hydraulic balance valve capable of automatically adapting load change |
| CN103343829A (en) * | 2013-07-24 | 2013-10-09 | 南京工业大学 | Balance valve and testing system thereof |
-
2018
- 2018-07-20 CN CN201810803960.XA patent/CN108825574B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2115952A (en) * | 1982-02-26 | 1983-09-14 | Rexroth Mannesmann Gmbh | Balanced pressure valve |
| DE4134575A1 (en) * | 1990-10-18 | 1992-04-23 | Caterpillar Mitsubishi Ltd | PRESSURE COMPENSATION VALVE, ESPECIALLY PRE-CONTROLLED PRESSURE COMPENSATION FOLLOW VALVE (LOGICAL VALVE) |
| CN1945028A (en) * | 2006-10-10 | 2007-04-11 | 太原理工大学 | Hydraulic balance valve capable of automatically adapting load change |
| CN103343829A (en) * | 2013-07-24 | 2013-10-09 | 南京工业大学 | Balance valve and testing system thereof |
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| CN108825574A (en) | 2018-11-16 |
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