CN112166672B - Pressure adjusting mechanism of constant-pressure hydraulic pump with temperature compensator - Google Patents
Pressure adjusting mechanism of constant-pressure hydraulic pump with temperature compensator Download PDFInfo
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- CN112166672B CN112166672B CN200910125462.5A CN200910125462A CN112166672B CN 112166672 B CN112166672 B CN 112166672B CN 200910125462 A CN200910125462 A CN 200910125462A CN 112166672 B CN112166672 B CN 112166672B
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Abstract
A pressure adjusting mechanism of a constant-pressure hydraulic pump with a temperature compensator comprises an adjusting valve 3, a follow-up piston 12, a return piston assembly 1, the temperature compensator 8, a swash plate 13 and a plurality of oil ways. Compared with the existing constant-pressure hydraulic pump adjusting mechanism, the automatic compensation mechanism has the advantages that the automatic compensation can be realized according to the actual condition of the oil temperature in the airplane hydraulic system, so that the constant-pressure point of the airplane variable hydraulic pump is not influenced by the temperature, and the stable pressure is provided for the airplane hydraulic system. Therefore, the efficiency of the constant pressure hydraulic pump is higher than that of the traditional adjusting mechanism, and the constant pressure hydraulic pump can be better suitable for high-pressure and high-power systems and also suitable for systems working intermittently. The adjusting mechanism has the advantages of simple structure, light weight, small volume and convenient and reliable operation.
Description
Technical Field
The invention relates to the technical field of hydraulic system oil pressure regulation, in particular to a pressure regulating mechanism of a constant-pressure hydraulic pump with a temperature compensator.
Background
According to the development trend of the future fighter, the future fighter puts higher requirements on a hydraulic system, and the hydraulic component is required to be small in size and high in system power. The hydraulic pump is used as a power source of the hydraulic system, and the hydraulic system needs to be developed to high pressure and large flow to meet the requirements of the hydraulic system, so that the heat productivity and the temperature of the hydraulic pump are inevitably increased. The most direct influence of the temperature rise is that the viscosity of the hydraulic oil is reduced, the internal leakage of the hydraulic pump is increased, and the volumetric efficiency of the pump is reduced. Therefore, the zero flow pressure of the outlet of the constant-pressure hydraulic pump is lower than the zero flow pressure set at normal temperature under the rated working condition or higher than the zero flow pressure set at the rated working condition temperature during starting, so that stable pressure can not be provided for an airplane hydraulic system, and the comprehensive performance of a fighter is influenced.
Disclosure of Invention
The invention aims to provide a pressure adjusting mechanism of a constant-pressure hydraulic pump with a temperature compensator. The regulating mechanism enables the zero flow pressure of the hydraulic pump to be basically not influenced by temperature, and the rated pressure provided by the hydraulic pump to the system is kept stable when the aircraft hydraulic system is started to the zero flow working condition at normal temperature.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the adjusting mechanism mainly comprises an adjusting valve, a follow-up piston, a return piston assembly, a temperature compensator, a swash plate and an oil way.
The regulating valve is arranged in a regulating valve sleeve, one end of a pressure regulating spring is tightly pressed on a ball head of the regulating valve, the other end of the pressure regulating spring is propped against a temperature compensator, the other end of the temperature compensator is tightly leaned against a pressure regulating screw, the valve sleeve, the pressure regulating spring and the temperature compensator are all arranged in a shell, and a high-pressure oil inlet oil way, a pressure regulating oil way and a shell oil return oil way are arranged in the shell; the regulating valve can move under the push of high-pressure oil or a pressure regulating spring, the left, the middle and the right of the valve sleeve are respectively communicated with each oil way, the regulating valve can move in the valve sleeve to enable a high-pressure oil inlet oil way and a pressure regulating oil way to be communicated, the pressure regulating oil way and an oil return oil way are disconnected or a high-pressure oil inlet oil way and the pressure regulating oil way are disconnected, and the pressure regulating oil way and the oil return oil way are communicated. The pressure regulating screw is arranged outside the shell, the pressure regulating screw can be regulated according to the requirement of the hydraulic system on zero flow pressure, and the pre-tightening force of the pressure regulating spring is changed, so that the aim of regulating the zero flow pressure of the outlet of the pump is fulfilled.
The servo piston and the return piston assembly are arranged at the lower part of the shell, the rotating arm of the swash plate is arranged between the servo piston and the return piston assembly, and the servo piston oil path is communicated with the pressure regulating oil path. The output displacement of the hydraulic pump is controlled by the rotation angle γ of the swash plate.
The working principle of the adjusting mechanism is as follows: when the hydraulic pump works, high-pressure oil entering from an oil inlet flows through the sleeve of the regulating valve and acts on the convex shoulder of the regulating valve, when the system pressure rises to be close to zero flow pressure, the high-pressure oil pushes the regulating valve to overcome the acting force of the pressure regulating spring, the valve moves right, the high-pressure oil flows through the valve to enter the cavity of the servo piston, then the servo piston pushes the swash plate to rotate, so that the inclination angle gamma of the swash plate is gradually reduced until the variable is completed, and the oil supply pressure of the hydraulic pump is constant at a zero flow pressure point; when the oil supply pressure of the hydraulic system is reduced, the thrust of the follow-up piston is reduced, the return piston assembly pushes the swash plate to rotate to increase the inclination angle gamma of the swash plate, the oil supply quantity of the hydraulic pump is increased, and the oil supply pressure of the hydraulic pump to the hydraulic system is stabilized at a zero flow pressure point. As the temperature of the continuous operation system of the hydraulic system gradually rises to reduce the viscosity of hydraulic oil, the leakage in the pump is increased, and the volumetric efficiency is reduced. Since the pump is a high pressure, high flow hydraulic pump, a reduction in the volumetric efficiency of the pump will result in a significant reduction in the pump outlet pressure. In order to compensate the influence of temperature change on the outlet pressure of the hydraulic pump, a novel temperature compensator is additionally arranged between a pressure regulating spring and a pressure regulating screw, and the temperature compensator consists of a compensator shell, a base, a temperature compensating sheet and an ejector rod. The core part of the temperature compensator consists of 10 temperature compensation sheets encapsulated between the compensator shell and the ejector rod. The compensation plate is made of a T-shaped ribbon of bi-metal 138/80 with a heat-sensitive material, which is sensitive to temperature changes. Therefore, after the temperature of the oil rises, the oil expands to increase the variable quantity of the pressure regulating spring type and enhance the elasticity, thereby automatically compensating the pressure drop caused by the reduction of the volumetric efficiency of the pump. On the contrary, when the temperature is reduced, the temperature compensator contracts, the elasticity of the pressure regulating spring is reduced, and the oil supply pressure of the pump to the hydraulic system is stabilized at a zero flow pressure point.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing constant-pressure hydraulic pump regulating mechanism, the pressure regulating mechanism of the constant-pressure hydraulic pump with the temperature compensator has the advantages that the automatic compensation can be realized according to the actual condition of the oil temperature in the airplane hydraulic system, so that the constant-pressure point of the airplane variable hydraulic pump is not influenced by the temperature, and the stable pressure is provided for the airplane hydraulic system. Therefore, the efficiency of the constant pressure hydraulic pump is higher than that of the traditional adjusting mechanism, and the constant pressure hydraulic pump can be better suitable for high-pressure and high-power systems and also suitable for systems working intermittently. The adjusting mechanism has the advantages of simple structure, light weight, small volume and convenient and reliable operation. The hydraulic servo system can be widely applied to the aviation field, and the comprehensive performance of the airplane is improved.
Drawings
FIG. 1 is a structural diagram of a pressure regulating mechanism of a constant pressure hydraulic pump with temperature compensation according to the present invention;
FIG. 2 is a block diagram of a temperature compensator;
in the figure: 1. the hydraulic servo system comprises a return piston assembly, a shell, a regulating valve, a high-pressure oil inlet oil path, a regulating valve sleeve, a shell oil return path, a pressure regulating spring, a temperature compensator, a pressure regulating screw, a pressure regulating oil path, a follow-up piston, a swash plate, a compensator shell, a base, a temperature compensating plate and a push rod, wherein the return piston assembly comprises 2, the shell, 3, the regulating valve, 4, a high-pressure oil inlet oil path, 5, a regulating valve sleeve, 6, the shell oil return path, 7.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments thereof.
Fig. 1 and 2 show the overall structure of the present invention.
The working principle of the adjusting mechanism is as follows: when the hydraulic pump works, the loaded high-pressure oil enters the sleeve 5 of the regulating valve through the high-pressure oil inlet oil way 4 and acts on the shoulder of the regulating valve 3. When the pressure of the oil supply port of the hydraulic pump is smaller than the full-flow maximum pressure, the hydraulic pressure acting on the high-pressure valve is balanced with the pretightening force of the pressure regulating spring 7, and the hydraulic pump works in a large-flow state. When the pressure of the oil supply port of the hydraulic pump is close to zero flow pressure, the regulating valve 3 is pushed by high-pressure oil to perform small displacement, at the moment, the convex shoulder of the regulating valve 3 moves to the hole edge of the regulating valve sleeve 5 leading to the pressure regulating oil way 10, when the pressure of the oil supply port of the hydraulic pump rises, the convex shoulder of the regulating valve 3 is pushed open by hydraulic pressure, high-pressure oil of the oil supply port flows to the follow-up piston cavity 12 through an opening formed by the convex shoulder of the regulating valve 3 and the oil hole of the regulating valve sleeve 5, the follow-up piston 12 pushes the swash plate 13 to rotate, the inclination angle gamma of the swash plate is reduced, the stroke of. On the contrary, when the pressure of the oil supply port of the hydraulic pump is reduced, the pressure regulating spring 7 pushes the regulating valve 3 to reduce the opening formed by the shoulder and the oil hole of the sleeve 5 of the regulating valve, the hydraulic pressure of the follow-up chamber 12 is reduced, the inclined angle gamma of the inclined disc of the hydraulic pump is increased under the action of the return piston assembly 1, the stroke of the plunger is increased, and the oil supply amount of the hydraulic pump is increased. When the pressure of the oil supply port of the hydraulic pump is reduced to be equal to or less than the full-flow maximum pressure, the hydraulic pump is restored to the maximum oil supply state.
The increase in temperature during the above process will cause a decrease in the volumetric efficiency of the pump, which in turn will result in a significant decrease in the pump outlet pressure, since the pump is a high pressure, high flow hydraulic pump. In order to compensate the influence of temperature change on the outlet pressure of the hydraulic pump, a novel temperature compensator 8 is additionally arranged between a pressure regulating spring 7 and a pressure regulating screw 9, and the temperature compensator 8 consists of a compensator shell 14, a base 15, a temperature compensating sheet 16 and an ejector rod 17. The core component of the temperature compensator 8 is composed of 10 temperature compensation plates 16 encapsulated between the compensator housing 14 and the ram 17. The temperature compensation plate 16 is made of a T-bend 138/80 heat sensitive bimetallic strip that is sensitive to temperature changes. Therefore, after the temperature of the oil rises, the part longitudinally extends, and at a certain temperature, the extension amount is determined by the specific bending value of the material, the thickness of the part and the arrangement mode of the temperature compensation sheet 16, so that the push rod 17 is pushed, the push rod 17 presses the pressure regulating spring 7 tightly, the pretightening force of the pressure regulating spring 7 is improved, and the effect of compensating the pressure reduction is achieved through the variable process. On the contrary, when the temperature is reduced, the compensating plate group is shortened, and the pretightening force of the pressure regulating spring 7 is reduced. This allows the pump zero flow pressure to be stabilized by temperature compensation.
Claims (2)
1. The utility model provides a take constant pressure hydraulic pump pressure adjustment mechanism of temperature compensator, by return piston subassembly (1), casing (2), adjusting valve (3), high-pressure oil import oil circuit (4), adjusting valve sleeve (5), casing oil return oil circuit (6), pressure regulating spring (7), temperature compensator (8), pressure regulating screw (9), pressure regulating oil circuit (10), follow-up piston oil circuit (11), follow-up piston (12), sloping cam plate (13) are constituteed, characterized by: the regulating valve (3) is arranged in a regulating valve sleeve (5), one end of a pressure regulating spring (7) is tightly pressed on a ball head of the regulating valve (3), the other end of the pressure regulating spring is propped against a temperature compensator (8), the other end of the temperature compensator (8) is tightly propped against a pressure regulating screw (9), the regulating valve sleeve (5), the pressure regulating spring (7) and the temperature compensator (8) are all arranged in a shell (2), and a high-pressure oil inlet oil way, a pressure regulating oil way and a shell oil return oil way are arranged in the shell (2); the regulating valve can move under the push of high-pressure oil or a pressure regulating spring, the left, the middle and the right of the valve sleeve are respectively communicated with each oil way, the pressure regulating screw is arranged outside the shell, the pressure regulating screw can be regulated according to the requirement of a hydraulic system on zero flow pressure, and the pre-tightening force of the pressure regulating spring is changed; the servo piston and the return piston assembly are arranged at the lower part of the shell, the rotating arm of the swash plate is arranged between the servo piston and the return piston assembly, and the servo piston oil path is communicated with the pressure regulating oil path; a temperature compensator (8) is additionally arranged between the pressure regulating spring (7) and the pressure regulating screw (9), and the temperature compensator (8) is composed of 10 temperature compensation sheets (16) encapsulated between a compensator shell (14) and an ejector rod (17).
2. The constant-pressure hydraulic pump pressure adjusting mechanism with the temperature compensator according to claim 1, characterized in that the compensating plate (16) is made of a T-bar 138/80 thermo-sensitive bimetallic strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910125462.5A CN112166672B (en) | 2009-12-18 | 2009-12-18 | Pressure adjusting mechanism of constant-pressure hydraulic pump with temperature compensator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910125462.5A CN112166672B (en) | 2009-12-18 | 2009-12-18 | Pressure adjusting mechanism of constant-pressure hydraulic pump with temperature compensator |
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| CN112166672B true CN112166672B (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910125462.5A Active CN112166672B (en) | 2009-12-18 | 2009-12-18 | Pressure adjusting mechanism of constant-pressure hydraulic pump with temperature compensator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691923A (en) * | 2020-06-19 | 2020-09-22 | 中航力源液压股份有限公司 | Straight-shaft type axial plunger variable motor device with constant pressure control |
| CN113669221A (en) * | 2021-08-30 | 2021-11-19 | 北京航空航天大学宁波创新研究院 | Load sensitive variable mechanism of variable pump and variable pump |
| CN113669222A (en) * | 2021-08-30 | 2021-11-19 | 北京航空航天大学宁波创新研究院 | Swash plate limiting and adjusting mechanism and constant-pressure variable pump |
-
2009
- 2009-12-18 CN CN200910125462.5A patent/CN112166672B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691923A (en) * | 2020-06-19 | 2020-09-22 | 中航力源液压股份有限公司 | Straight-shaft type axial plunger variable motor device with constant pressure control |
| CN113669221A (en) * | 2021-08-30 | 2021-11-19 | 北京航空航天大学宁波创新研究院 | Load sensitive variable mechanism of variable pump and variable pump |
| CN113669222A (en) * | 2021-08-30 | 2021-11-19 | 北京航空航天大学宁波创新研究院 | Swash plate limiting and adjusting mechanism and constant-pressure variable pump |
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