CN117212276A - Delay pressure-building valve and motor pump load starting method - Google Patents
Delay pressure-building valve and motor pump load starting method Download PDFInfo
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- CN117212276A CN117212276A CN202311115185.6A CN202311115185A CN117212276A CN 117212276 A CN117212276 A CN 117212276A CN 202311115185 A CN202311115185 A CN 202311115185A CN 117212276 A CN117212276 A CN 117212276A
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Abstract
The application relates to a delayed pressure-build valve and a motor pump load starting method, belongs to a hydraulic mechanism, and can solve the problems that when the motor pump is started under load, the starting is difficult, the starting current is large, the hydraulic impact in an oil pump is large and the like. The oil pump adopting the embedded design is arranged in the valve block 3, and a delayed pressure-building valve mechanism is arranged in the valve block 3, as shown in the abstract drawing. The delay build-up valve is composed of a lock nut 5, a delay valve plug 7, a delay valve pressure regulating screw 6, a delay valve spring 8, a delay valve core 12, a delay valve sleeve 10 and a delay valve cover plate 11. The delayed pressure build-up valve mechanism can reduce the rising speed of the oil pressure at the oil outlet of the oil pump when the motor pump is started under load, thereby playing the role of protecting the motor and the oil pump and enhancing the capacity of the motor pump for starting under load.
Description
Technical Field
The application particularly relates to a delayed pressure build valve for reducing the starting load of a motor pump, which is used for improving the performance of a motor pump of a certain model and improving the on-load starting capacity of the motor pump under a high-load working condition.
Technical Field
The motor pump is used as a core element component of a hydraulic system, has the characteristics of high output power, small volume, high reliability and the like, and is widely applied to the fields of engineering machinery, aerospace, military equipment and the like. In general, after the motor pump starts to work, the output pressure of the motor pump can slowly rise, and the motor pump is required to start under load under certain special working conditions. When the motor pump is started under load, a larger external load is born at the beginning, so that the starting moment is larger, the starting current of the motor is overlarge, and the service life of the motor is influenced; meanwhile, because of larger external load, the inside of the oil pump can also be subjected to hydraulic impact, so that parts of the oil pump are damaged.
Disclosure of Invention
The application provides a device capable of providing overload protection for a motor pump during load starting of the motor pump, reducing starting current of the motor pump and reducing hydraulic impact of an oil pump aiming at possible negative influence during load starting of the existing motor pump.
The application adopts the following scheme: the delay pressure building valve is arranged in a valve block 3 and comprises a lock nut 5, a delay valve plug 7, a delay valve pressure regulating screw 6, a delay valve spring 8, a delay valve core 12, a delay valve sleeve 10 and a delay valve cover plate 11; the valve body of the delay pressure-building valve is fixed in the valve block 3 through a lock nut 5, a delay valve plug 7 and a delay valve cover plate 11, and a delay valve spring 8 is positioned between a delay valve pressure-regulating screw 6 and a delay valve core 12 and is in a compressed state; three oil channels are arranged in the valve block 3, one end of each oil channel is communicated with an oil outlet of the oil pump, and the other end of each oil channel is respectively connected with the oil outlet of the valve block, the middle part of the delay pressure building valve and the bottom of the delay pressure building valve to form a first oil channel, a second oil channel and a third oil channel.
Further, an oil duct connected with the middle part of the delay pressure building valve is arranged at a set position P before entering the delay pressure building valve 1 A damping core 13 is arranged and is communicated with the oil tank through a hole T on the oil pump rear sealing cover after entering the delay pressure build-up valve.
Further, the setting position P 1 The oil pump is positioned on the second oil path and is arranged between the oil outlet flow passage of the oil pump and the delay valve core.
Furthermore, the delay pressure build-up valve consists of a valve body and a pressure regulating mechanism.
Further, the delay valve core 12 is movable within the delay valve housing 10.
Further, the compression amount of the delay valve spring 8 is regulated by the delay valve pressure regulating screw 6.
The application also provides a motor pump load starting method, which is used for starting the delay pressure build-up valve and comprises the following steps:
when the motor pump is started under load, oil flows to the delay pressure building valve through the second oil way, after flowing into the delay pressure building valve, the oil flows back to the oil tank through the delay valve sleeve and a hole T on a rear sealing cover of the oil pump, and part of the oil enters the bottom of the delay valve core through the third oil way;
and when the output flow of the motor pump reaches a set value, hydraulic pressure acting on the bottom of the delay valve core pushes the delay valve core to overcome the spring force to move in the delay valve sleeve, oil output by the oil pump cannot flow back to the oil tank through the second oil way, and the motor pump completes load starting.
Furthermore, the compression amount of the spring is adjusted by screwing the lock nut, so that the delayed pressure build-up valve can play a role in delaying pressure build-up under different external loads.
The application has the advantages that:
1. the delay pressure build-up valve can prolong the build-up time at the oil outlet of the oil pump when the oil pump is started under load, reduce the rising speed of the pressure at the oil outlet of the oil pump, avoid the problems of overlarge motor current and hydraulic impact on internal parts of the oil pump caused by overlarge load when the motor pump is started under load, effectively improve the starting capacity of the motor pump under the loaded working condition and obviously prolong the service life of the motor pump.
2. The delay pressure-building valve and the oil pump parts are installed in the valve block together, and the whole oil pump adopts an embedded design, so that the integration level is high and the occupied space is small.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a delayed build valve of the present application;
FIG. 2 is a schematic diagram of a delayed pressure build valve according to the present application;
FIG. 3 is a schematic diagram of the valve core position and oil path of the delay pressure build valve when the motor pump is just started under load;
FIG. 4 is a schematic diagram of the valve core position and the oil path when the delay build-up valve completes the build-up of the outlet of the motor pump and normally outputs oil outwards;
FIG. 5 is a schematic diagram of the delay build-up valve of the present application during build-up;
FIG. 6 is a schematic diagram of the delayed pressure build valve of the present application after the build up of pressure is completed;
reference numerals illustrate: in the figure, 1 is a motor, 2 is a valve block, 3 is a delay build-up valve, 4 is an oil tank, 5 is a lock nut, 6 is a delay valve pressure regulating screw, 7 is a delay valve plug, 8 is a delay valve spring, 9 is an oil pump rear sealing cover, 10 is a delay valve sleeve, 11 is a delay valve cover plate, 12 is a delay valve core, and 13 is a damping core.
Description of the embodiments
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
The embodiment of the application provides a delay pressure building valve, the structure of a motor pump and an oil tank is shown in fig. 1, and the installation position and the structure of the delay pressure building valve are shown in fig. 2.
The delay pressure-building valve is arranged in the valve block 3 and comprises a lock nut 5, a delay valve plug 7, a delay valve pressure-regulating screw 6, a delay valve spring 8, a delay valve core 12, a delay valve sleeve 10 and a delay valve cover plate 11; the valve body of the delay pressure-building valve is fixed in the valve block 3 through a lock nut 5, a delay valve plug 7 and a delay valve cover plate 11, and a delay valve spring 8 is positioned between a delay valve pressure-regulating screw 6 and a delay valve core 12 and is in a compressed state; three oil channels are arranged in the valve block 3, one end of each oil channel is communicated with an oil outlet of the oil pump, and the other end of each oil channel is respectively connected with the oil outlet of the valve block, the middle part of the delay pressure building valve and the bottom of the delay pressure building valve to form a first oil channel, a second oil channel and a third oil channel.
In this embodiment, the oil pump adopts an embedded structure, that is, the oil pump components are installed in the valve block, and then the pressure-build-up delay valve is installed in the valve block. The device can ensure that the oil pressure at the oil outlet of the oil pump steadily rises when the oil pump is started under load, thereby protecting the motor pump from being started under load. The delay build-up valve consists of a lock nut, a delay valve plug, a delay valve pressure regulating screw, a delay valve spring, a delay valve core, a delay valve sleeve and a delay valve cover plate, and the concrete structure is shown in figure 2.
Further, an oil duct connected with the middle part of the delay pressure building valve is arranged at a set position P before entering the delay pressure building valve 1 A damping core 13 is arranged and is communicated with the oil tank through a hole T on the oil pump rear sealing cover after entering the delay pressure build-up valve.
Further, the setting position P 1 The oil pump is positioned on the second oil path and is arranged between the oil outlet flow passage of the oil pump and the delay valve core.
Furthermore, the delay pressure build-up valve consists of a valve body and a pressure regulating mechanism.
Further, the delay valve core 12 is movable within the delay valve housing 10.
Further, the compression amount of the delay valve spring 8 is regulated by the delay valve pressure regulating screw 6.
In the embodiment, three oil ways are connected to the oil outlet of the oil pump, and the first oil way is communicated with the outside and is used for the oil pump to output oil to the executing mechanism; the second oil way is communicated with the middle part of the delay pressure building valve through a P2 hole and finally leads to the oil tank, a damping core is arranged at the P1 position of the second oil way and used for playing a role in throttling and reducing pressure, and pressure is built at the inlet of the damping core; the third oil passage introduces the outlet oil to the bottom of the retard spool. When the motor pump is started under load, the motor speed is lower, the flow rate of the oil pump is smaller, and the oil at the outlet of the oil pump cannot be output outwards because the external oil pressure is larger, so that the oil flows to the delay pressure building valve through the second oil way, and after flowing into the delay pressure building valve, the oil flows back to the oil tank through the delay valve sleeve and a hole T on a rear sealing cover of the oil pump; meanwhile, the oil flows to the bottom of the delay valve core through the Q hole under the action of the third oil way, as shown in fig. 3 and 5. The measure ensures that the outlet pressure cannot rise too fast when the motor pump is started under load, thereby influencing the performance of the motor and the oil pump. Along with the gradual rise of the motor rotation speed, the flow of the oil pump is also gradually increased, the throttling effect of the damping core at the second oil way enables the pressure at the left side of the damping core to gradually rise and act on the bottom of the delay valve core through the third oil way, when the output flow of the motor pump reaches a certain value, the hydraulic pressure acting on the bottom of the delay valve core pushes the delay valve core to overcome the spring force to move in the delay valve sleeve, the position shown in fig. 4 and 6 is reached, and the oil output by the oil pump cannot flow back to the oil tank through the second oil way. At this time, the oil pump has established a certain pressure at the outlet, and the motor pump can finish the load starting. The compression amount of the spring can be adjusted by screwing the lock nut, so that the delayed pressure building valve can play a role in delaying pressure building under different external loads.
Under the dragging of the motor, the oil pump absorbs oil from the oil tank 4 through the hole on the oil pump rear sealing cover 9, and then is discharged through the oil outlet hole on the valve block to supply oil for the hydraulic actuating mechanism.
Example 2
The application also provides a motor pump load starting method, which is used for starting the delay pressure build-up valve and comprises the following steps:
when the motor pump is started under load, the discharged oil of the oil pump can flow to the middle part of the delayed pressure build valve through a second oil way as shown in fig. 3 and finally flows back to the oil tank, so that the rising speed of the oil pressure at the oil outlet of the oil pump is slowed down, and the starting moment of the motor pump and the starting current of the motor are reduced. And a damping core is arranged on the second oil way, and when oil flows through the damping core, the pressure is increased at the inlet of the damping core due to the throttling effect of the damping core. The oil flows back to the oil tank through the second oil passage while passing through the third oil passage, as shown in fig. 3, to act on the bottom of the retard spool. Along with the gradual rise of the motor rotating speed, the flow of the oil pump is gradually increased, the left side pressure of the damping core is gradually increased, and the third oil way acts on the bottom of the delay valve core to push the delay valve core to overcome the elastic force of the spring to move, so that the second oil way is blocked. At this time, the oil pressure at the oil outlet of the oil pump and the flow of the oil pump are already established, and the motor pump can smoothly finish the on-load starting.
Furthermore, the compression amount of the spring is adjusted by screwing the lock nut, so that the delayed pressure build-up valve can play a role in delaying pressure build-up under different external loads.
Claims (8)
1. The delay pressure building valve is characterized by being installed in a valve block (3) and comprising a lock nut (5), a delay valve plug (7), a delay valve pressure regulating screw (6), a delay valve spring (8), a delay valve core (12), a delay valve sleeve (10) and a delay valve cover plate (11); the valve body of the delay pressure-building valve is fixed in the valve block (3) through a lock nut (5), a delay valve plug (7) and a delay valve cover plate (11), and a delay valve spring (8) is positioned between a delay valve pressure-regulating screw (6) and a delay valve core (12) and is in a compression state; three oil channels are arranged in the valve block (3), one end of each oil channel is communicated with an oil outlet of the oil pump, and the other end of each oil channel is respectively connected with the oil outlet of the valve block, the middle part of the delay pressure building valve and the bottom of the delay pressure building valve to form a first oil channel, a second oil channel and a third oil channel.
2. The delayed pressure build-up valve of claim 1, wherein the valve is connected to the middle part of the delayed pressure build-up valveIs at a set position P before entering the delay build-up valve 1 And a damping core (13) is arranged and is communicated with the oil tank through a hole T on the oil pump rear sealing cover after entering the delay pressure build-up valve.
3. A delayed pressure build-up valve as defined in claim 2, wherein said set position P 1 The oil pump is positioned on the second oil path and is arranged between the oil outlet flow passage of the oil pump and the delay valve core.
4. The delayed pressure build valve of claim 1 comprising a valve body and a pressure regulating mechanism.
5. A delay build-up valve according to any of claims 1 to 4, characterized in that the delay spool (12) is movable in a delay valve housing (10).
6. A delay build-up valve according to claim 5, characterized in that the amount of compression of the delay valve spring (8) is regulated by a delay valve pressure regulating screw (6).
7. A motor pump load starting method for starting the delay build-up valve according to any one of claims 1 to 6, comprising:
when the motor pump is started under load, oil flows to the delay pressure building valve through the second oil way, after flowing into the delay pressure building valve, the oil flows back to the oil tank through the delay valve sleeve and a hole T on a rear sealing cover of the oil pump, and part of the oil enters the bottom of the delay valve core through the third oil way;
and when the output flow of the motor pump reaches a set value, hydraulic pressure acting on the bottom of the delay valve core pushes the delay valve core to overcome the spring force to move in the delay valve sleeve, oil output by the oil pump cannot flow back to the oil tank through the second oil way, and the motor pump completes load starting.
8. The method of on-load starting of a motor pump according to claim 7, wherein the compression amount of the spring is adjusted by screwing the lock nut so that the delayed pressure build-up valve can play a role of delayed pressure build-up under different external loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311115185.6A CN117212276A (en) | 2023-08-31 | 2023-08-31 | Delay pressure-building valve and motor pump load starting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311115185.6A CN117212276A (en) | 2023-08-31 | 2023-08-31 | Delay pressure-building valve and motor pump load starting method |
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| Publication Number | Publication Date |
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| CN117212276A true CN117212276A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311115185.6A Pending CN117212276A (en) | 2023-08-31 | 2023-08-31 | Delay pressure-building valve and motor pump load starting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120260A (en) * | 1998-11-17 | 2000-09-19 | Spx Corporation | Soft start valve |
| JP2001282362A (en) * | 2000-03-29 | 2001-10-12 | Hitachi Constr Mach Co Ltd | Throttle valve and switching valve using the same |
| US20050254962A1 (en) * | 2004-05-12 | 2005-11-17 | Pehrson Alona E | Fuel pump with internal pressure regulation |
| CN204419742U (en) * | 2014-01-14 | 2015-06-24 | 卡特彼勒公司 | Failure safe guide selector valve and there is the machine of described guide's selector valve |
| CN114396398A (en) * | 2021-11-30 | 2022-04-26 | 河南航天液压气动技术有限公司 | Active load reduction gear pump and hydraulic system |
-
2023
- 2023-08-31 CN CN202311115185.6A patent/CN117212276A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120260A (en) * | 1998-11-17 | 2000-09-19 | Spx Corporation | Soft start valve |
| JP2001282362A (en) * | 2000-03-29 | 2001-10-12 | Hitachi Constr Mach Co Ltd | Throttle valve and switching valve using the same |
| US20050254962A1 (en) * | 2004-05-12 | 2005-11-17 | Pehrson Alona E | Fuel pump with internal pressure regulation |
| CN204419742U (en) * | 2014-01-14 | 2015-06-24 | 卡特彼勒公司 | Failure safe guide selector valve and there is the machine of described guide's selector valve |
| CN114396398A (en) * | 2021-11-30 | 2022-04-26 | 河南航天液压气动技术有限公司 | Active load reduction gear pump and hydraulic system |
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