CN114233696B - Small-size pressure boost and pressurize device - Google Patents
Small-size pressure boost and pressurize device Download PDFInfo
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- CN114233696B CN114233696B CN202010942643.3A CN202010942643A CN114233696B CN 114233696 B CN114233696 B CN 114233696B CN 202010942643 A CN202010942643 A CN 202010942643A CN 114233696 B CN114233696 B CN 114233696B
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- 239000003921 oil Substances 0.000 claims abstract description 129
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- 239000002828 fuel tank Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
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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
- F15B13/029—Counterbalance valves
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/202—Externally-operated valves mounted in or on the actuator
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a small-sized pressurizing and pressure maintaining device, belongs to the technical field of hydraulic systems, and solves the problems of long pressure building time, low pressure changing response speed and high pressure of a low-pressure oil way working for a long time of the existing hydraulic system. The small-sized pressurizing and pressure maintaining device comprises: a first piston structure and a second piston structure; the first piston structure is provided with a first piston, the first piston is a booster piston, the thin part is communicated with the high-pressure oil passage, and the thick part is communicated with the low-pressure oil passage; one end of the second piston structure is communicated with the low-pressure oil way, and the other end of the second piston structure is communicated with the pressure relief oil way; the second piston structure is provided with a second piston, and the second piston is driven by the elastic piece and hydraulic oil of the low-pressure oil circuit together; the second piston is provided with an overflow valve. The hydraulic oil pressure control system can provide certain basic pressure when the system builds pressure, ensures the pressure of a low-pressure oil way when the system works, and protects the system when hydraulic oil expands due to heating.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a small-sized pressurizing and pressure maintaining device.
Background
When the system starts to work, because the pressure of an oil tank (a low-pressure oil way) is low (the oil pump is easy to damage and leak due to overhigh pressure), the oil pump is easy to suck, so that the system pressure building time is prolonged, and the system is quite unfavorable for some hydraulic systems which are sensitive to time; meanwhile, because the system is small in volume, when hydraulic oil expands after long-time working, the pressure of an oil tank (a low-pressure oil way) rises faster, damage to the low-pressure end of an oil pump and other low-pressure hydraulic devices is easy to occur, the low-pressure oil way leakage phenomenon occurs, and structural damage can be caused when the system is serious; meanwhile, in the hydraulic system with the requirement on quick response, the fluctuation of oil absorption of the oil pump is large, and the phenomenon of suction is often caused by the fact that the pressure of the low-pressure oil way is fast reduced, so that sufficient high-pressure oil cannot be output.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a small-sized pressurizing and pressure maintaining device, which is used for solving the problems of long pressure building time, slow pressure transformation response speed and increased pressure of a low-pressure oil way working for a long time in the existing hydraulic system.
The aim of the invention is mainly realized by the following technical scheme:
In the technical scheme of the invention, the small-sized pressurizing and pressure maintaining device comprises: a first piston structure and a second piston structure;
The first piston structure is provided with a first piston, the first piston is a booster piston, the thin part is communicated with the high-pressure oil passage, and the thick part is communicated with the low-pressure oil passage; one end of the second piston structure is communicated with the low-pressure oil way, and the other end of the second piston structure is communicated with the pressure relief oil way; the second piston structure is provided with a second piston, and the second piston is driven by the elastic piece and hydraulic oil of the low-pressure oil circuit together; the second piston is provided with an overflow valve.
In the technical scheme of the invention, the first piston structure further comprises a first piston cavity and a fuel tank cover;
The first piston cavity is a variable-diameter cavity, the thin part of the first piston cavity and the thin part of the first piston slide relatively in a sealing way, and the thick part of the first piston cavity and the thick part of the first piston slide relatively in a sealing way; the thin part of the first piston cavity is communicated with the high-pressure oil passage, and the thick part is communicated with the low-pressure oil passage;
The fuel tank cap is fixedly arranged on the thick part of the first piston cavity in a sealing way and limits the first piston to slide relative to the first piston cavity.
In the technical scheme of the invention, the second piston structure further comprises a second piston cavity and a limiting rod;
the second piston cavity is a cylindrical cavity, and the second piston cavity and the second piston slide in a sealing manner relatively; the first end of the second piston cavity is communicated with the low-pressure oil way, and the second end of the second piston cavity is communicated with the pressure relief oil way;
The limiting rod is fixedly arranged at the second end of the second piston cavity in a sealing mode, and the sliding of the second piston relative to the second piston cavity is limited.
In the technical scheme of the invention, the limiting rod is provided with an axial through hole, one end of the axial through hole is communicated with the outlet of the overflow valve on the second piston, and the other end of the axial through hole is communicated with the pressure relief oil path.
In the technical scheme of the invention, the elastic piece is a spring and is partially sleeved on the limiting rod; one end of the elastic piece is propped against the limiting rod, and the other end is propped against the second piston and is in a compressed state.
In the technical scheme of the invention, the overflow valve comprises a valve core, an overflow hole and an overflow spring;
the end face of the second piston is provided with a valve body through hole and an overflow hole, and the valve core passes through the valve body through hole;
the overflow spring applies elastic force to the valve core, so that the valve core blocks the overflow hole.
In the technical scheme of the invention, the valve core comprises a conical part and a rod-shaped part which are integrated, the tip end of the conical part is connected with one end of the rod-shaped part, and the other end of the rod-shaped part is provided with a limiting structure;
the valve body through hole comprises a conical hole and a reducing hole, and the tip end of the conical hole is communicated with the thin end of the reducing hole;
the shape and the size of the conical part are the same as those of the conical hole; the diameter of the rod-shaped part is equal to that of the thin end of the reducing hole.
In the technical scheme of the invention, the overflow hole is radially arranged on the conical surface of the conical hole along the conical hole.
In the technical scheme of the invention, the shell of the first piston structure and the shell of the second piston structure are of an integrated structure, and the axes of the first piston structure and the second piston structure are parallel.
In the technical scheme of the invention, the small pressurizing and pressure maintaining device is also provided with a blind hole pipe which is communicated with the low-pressure oil way;
The first piston structure and the second piston structure are communicated with the low-pressure oil passage through blind hole pipes.
The technical scheme of the invention can at least realize one of the following effects:
1. In the pressure building process, the second piston structure is arranged, so that the pressure building speed can be improved by pushing the second piston through the elastic piece, the pressure building delay is reduced, the response speed of the hydraulic system is improved, and the requirement of quick response of the hydraulic system is met;
2. in the working process, the second piston structure is arranged, so that the rapid fluctuation of the hydraulic pressure in the hydraulic system can be relieved through the elastic piece, the hydraulic system is prevented from being damaged due to hydraulic impact, and the hydraulic response speed in the working process can be further improved;
3. After a period of work, when the low-pressure oil way produces hydraulic oil expansion because of reasons such as temperature, the elastic component of second piston structure is compressed, can absorb the hydraulic oil volume that increases, prevents that the low-pressure oil way from being burst, in case hydraulic oil expansion is excessive, releases too much hydraulic oil through the overflow valve on the second piston to the low-pressure oil way is protected.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic diagram of an internal structure of an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of the working state of the embodiment of the present invention;
FIG. 3 is an overflow schematic diagram of the protection state according to the embodiment of the invention;
fig. 4 is a schematic diagram of an overflow valve according to an embodiment of the invention.
Reference numerals:
1-a high-pressure oil way; 2-a first piston; 3-a fuel tank cap; 4-a second piston; 5-an elastic member; 6-a limiting rod; 7-a low-pressure oil path; 8-overflow springs; 9-valve core; 10-overflow aperture.
Detailed Description
The following detailed description of preferred embodiments of the invention is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the invention, are used to explain the principles of the invention and are not intended to limit the scope of the invention.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "coupled" should be interpreted broadly, for example, as being fixedly coupled, as being detachably coupled, as being integrally coupled, as being mechanically coupled, as being electrically coupled, as being directly coupled, as being indirectly coupled via an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "top," "bottom," "above … …," "below," and "on … …" are used throughout to describe relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are versatile, irrespective of their orientation in space.
The embodiment of the invention provides a small pressurizing and pressure maintaining device, which solves the problems of low pressure of a system pressure building oil tank, high-temperature expansion of hydraulic oil and pressure maintaining of a low-pressure oil circuit 7, has the characteristic of low processing requirement, ensures basic pressure when the system does not work, ensures basically stable pressure of the low-pressure oil circuit 7 when the system works, and provides a protection function when the low-pressure oil circuit 7 is too high.
Specifically, an embodiment of the present invention provides a small-sized pressurizing and pressure maintaining device, including: a first piston structure and a second piston structure; the first piston structure is provided with a first piston 2, the first piston 2 is a booster piston, the thin part is communicated with the high-pressure oil channel 1, and the thick part is communicated with the low-pressure oil channel 7; one end of the second piston structure is communicated with the low-pressure oil way 7, and the other end of the second piston structure is communicated with the pressure relief oil way; the second piston structure is provided with a second piston 4, and the second piston 4 is driven by the elastic piece 5 and hydraulic oil of the low-pressure oil circuit 7; the second piston 4 is provided with an overflow valve.
When the hydraulic system is started to build pressure, the elastic piece 5 pushes the second piston 4, so that hydraulic oil in the second piston structure is pushed into the low-pressure oil channel 7, even if a suction phenomenon occurs when the hydraulic pump is started in the pressure building process, the hydraulic lifting of the low-pressure oil channel 7 can be ensured, and the pressure building delay caused by suction is eliminated; when the hydraulic system is in hydraulic adjustment in the normal process, the second piston 4 weakens the hydraulic change delay caused by the transfer fluctuation of the hydraulic pump under the combined action of the hydraulic oil of the low-pressure oil channel 7 and the elastic piece 5, and prevents the hydraulic shock of the low-pressure oil channel 7 caused by the hydraulic shock on the wall surface from damaging the low-pressure oil channel 7; after the hydraulic system continuously works for a period of time, the hydraulic oil of the low-pressure oil way 7 is heated and expanded, the hydraulic oil of the low-pressure oil way 7 pushes the second piston 4 to compress the elastic piece 5 so as to absorb the hydraulic oil of the expanded low-pressure oil way 7, if the expansion of the hydraulic oil of the low-pressure oil way 7 exceeds the bearing range of the second piston structure, excessive hydraulic oil flows out of an overflow valve of the second piston 4 so as to prevent the pressure of the hydraulic oil of the low-pressure oil way 7 from being abnormally increased due to the expansion of the hydraulic oil, and protect the low-pressure oil way 7 from being damaged.
In the embodiment of the invention, the first piston structure is a booster piston, and is used for realizing the basic booster function of the embodiment of the invention, and specifically, the first piston structure further comprises a first piston cavity and a fuel tank cover 3; the first piston cavity is a variable-diameter cavity, the thin part of the first piston cavity and the thin part of the first piston 2 slide in a sealing way, and the thick part of the first piston cavity and the thick part of the first piston 2 slide in a sealing way; the thin part of the first piston cavity is communicated with the high-pressure oil channel 1, and the thick part is communicated with the low-pressure oil channel 7; the fuel tank cap 3 is sealingly mounted in the thick portion of the first piston chamber and restricts sliding movement of the first piston 2 relative to the first piston chamber. Because the low-pressure oil way 7 pushes the piston from the thick part of the first piston 2, the output end of the first piston structure, namely the thin part of the first piston cavity, pushes the hydraulic oil of the high-pressure oil way 1 due to the stretching-in of the thin part of the first piston 2, and the supercharging process is realized.
When the first piston structure is installed, the first piston 2 is inserted into the first piston cavity from the thick portion of the first piston cavity, and then the fuel tank cap 3 is installed at the end of the thick portion of the first piston cavity, and meanwhile, a sufficient space is ensured in the thick portion of the first piston cavity as a moving space of the thick portion of the first piston 2.
A sealing ring is arranged between the thick portion of the first piston 2 and the thick portion of the first piston chamber, a sealing ring is arranged between the thin portion of the first piston 2 and the thin portion of the first piston chamber, and a sealing ring is arranged between the fuel tank cap 3 and the thick portion of the first piston chamber.
Because the thick portion of the first piston cavity is communicated with the low-pressure oil way 7, and meanwhile, in order to simplify the structure of the embodiment of the invention and reduce the size of the embodiment of the invention, in the embodiment of the invention, the thick portion side wall of the first piston cavity is provided with a first through hole, the thick portion of the first piston cavity is communicated with the low-pressure oil way 7 through the first through hole, the oil tank cover 3 is provided with a limiting structure, the limiting structure is provided with a yielding part, the limiting structure limits the moving range of the first piston 2, the first piston 2 is prevented from blocking the first through hole, and the yielding part is used for preventing the oil tank cover 3 from blocking the first through hole.
The embodiment of the invention balances the pressure change of the low-pressure oil circuit 7 through a second piston structure, and particularly, the second piston structure also comprises a second piston cavity and a limiting rod 6; the second piston cavity is a cylindrical cavity, and the second piston cavity and the second piston 4 slide in a sealing manner relatively; the first end of the second piston cavity is communicated with the low-pressure oil way 7, and the second end of the second piston cavity is communicated with the pressure relief oil way; the limiting rod 6 is fixedly arranged at the second end of the second piston cavity in a sealing way, and limits the sliding of the second piston 4 relative to the second piston cavity. When the hydraulic pressure of the low-pressure oil line 7 and/or the volume of the hydraulic oil change, the second piston cavity is communicated with the low-pressure oil line 7, and the hydraulic oil in the second piston cavity enters or flows out of the low-pressure oil line 7 through the movement of the second piston 4, so that the buffering of the hydraulic pressure change of the low-pressure oil line is realized.
When the second piston structure is installed, the second piston 4 is inserted into the second piston cavity, and the limit rod 6 is installed at the end part of the second piston cavity, so that the second piston cavity is ensured to have enough space as the moving space of the second piston 4.
The sealing ring is arranged between the second piston 4 and the second piston cavity, and the sealing ring is arranged between the limiting rod 6 and the second piston cavity.
Because the second piston cavity is communicated with the low-pressure oil way 7, and meanwhile, in order to simplify the structure of the embodiment of the invention and reduce the size of the embodiment of the invention, in the embodiment of the invention, the side wall of the second piston cavity is provided with a second through hole, the second piston cavity is communicated with the low-pressure oil way 7 through the second through hole, and the second piston 4 is provided with a relief part for preventing the second piston 4 from blocking the second through hole.
In order to facilitate connection of the pressure relief oil path, in the embodiment of the invention, the limiting rod 6 is provided with an axial through hole, one end of the axial through hole is communicated with an outlet of the overflow valve on the second piston 4, and the other end of the axial through hole is communicated with the pressure relief oil path. When the second piston 4 compresses tightly the elastic piece 5 until the second piston 4 contacts with the limiting rod 6 to limit, if the pressure of the low-pressure oil way 7 is continuously increased due to continuous expansion of hydraulic oil and exceeds the limit of the overflow valve, the overflow valve is opened, the hydraulic oil of the low-pressure oil way 7 in the second piston cavity flows into the axial through hole of the limiting rod 6 through the overflow valve and further flows into the pressure relief oil way, so that the pressure relief protection of the low-pressure oil way 7 is realized, the hydraulic oil of the low-pressure oil way 7 is prevented from being excessively expanded and exceeds the adjusting range of the second piston structure, and the expansion and damage of the low-pressure oil way 7 are caused.
In the embodiment of the invention, the elastic piece 5 is a spring and is partially sleeved on the limiting rod 6; one end of the elastic piece 5 is propped against the limit rod 6, and the other end is propped against the second piston 4 and is in a compressed state.
As shown in fig. 1, when the device of the embodiment of the present invention is installed, both the second piston 4 and the first piston 2 are in the initial positions, and the elastic member 5 is partially compressed after the hydraulic oil is injected, as shown in fig. 2, so that the pre-compression force of the elastic member 5 is smaller than the target pressure of the low pressure oil passage 7 in the initial state.
After the end of the filling, the pretension F 0 of the spring element 5 and the system pressure of the low-pressure line 7The method meets the following conditions:
wherein D 2 is the diameter of the second piston 4.
During the pressure build-up process, the system pressure of the low-pressure oil circuit 7The formula is satisfied, the suction phenomenon of the oil pump can be avoided, the normal pressure building process of the system is ensured, and in addition, the pressure building process of the system is performed by the method of/>The value of (2) is relatively small, and damage to the hydraulic devices of the low-pressure oil circuit 7 due to excessive hydraulic pressure can be avoided.
As shown in fig. 2, after the pressure build-up is completed, the hydraulic oil in the high-pressure oil path 1 pushes the first piston 2, so that a part of the hydraulic oil in the low-pressure oil path 7 enters the second piston cavity, the second piston 4 is pushed to move to the middle part of the second piston cavity against the acting force of the elastic member 5, at this time, the elastic member 5 is compressed from the initial length of H 0 to the built-up length of H 1, the elastic force of the elastic member 5 is increased from the initial length of F 0 to the length of F 1, and the system pressure of the low-pressure oil path 7 at this time is the lower limit of the hydraulic pressure when the hydraulic system works normallyAt this time/>The method meets the following conditions:
After the hydraulic system starts to work, the oil pump can generate transferred fluctuation, so that the hydraulic oil quantity of the low-pressure oil circuit 7 suddenly changes, for example, the hydraulic oil quantity suddenly decreases, and the second piston 4 is pushed by the elastic piece 5, so that part of hydraulic oil in the second piston cavity enters the low-pressure oil circuit 7, and the pressure of the low-pressure oil circuit 7 cannot suddenly decrease, so that the pressure maintaining effect is realized.
At this time, the pressure P H of the high-pressure oil passage 1 of the embodiment of the present invention satisfies:
Where D is the diameter of the thin end of the first piston 2, D 1 is the diameter of the thick end of the first piston 2, and h 0 is the maximum stroke allowed by the first piston 2.
As shown in fig. 3, after the hydraulic system works for a period of time, the hydraulic oil is heated and expanded, the hydraulic pressure of the low-pressure oil way 7 is increased, a part of hydraulic oil enters the second piston cavity, the second piston 4 is pushed against the elastic force of the elastic element 5 until the second piston 4 and the limit rod 6 form contact limit, at this time, the system pressure of the low-pressure oil way 7 is the upper hydraulic limit when the hydraulic system works normallyWhen the hydraulic oil continues to expand and the hydraulic pressure in the low-pressure oil way 7 exceeds the overflow pressure of the overflow valve, the overflow valve is opened, the hydraulic oil enters the pressure relief oil way through the overflow valve and returns to the oil tank, so that the hydraulic pressure of the low-pressure oil way 7 cannot continuously rise, and the middle hydraulic part of the low-pressure oil way 7 is protected.
In the embodiment of the present invention, the target hydraulic pressure of the low-pressure oil circuit 7 is not adjusted during the working process once being set, so that the overflow critical value of the overflow valve in the embodiment of the present invention is a fixed value as shown in fig. 4 in order to simplify the structure. Specifically, the overflow valve comprises a valve core 9, an overflow hole 10 and an overflow spring 8; the end face of the second piston 4 is provided with a valve body through hole and an overflow hole 10, and the valve core 9 passes through the valve body through hole; the overflow spring 8 applies elastic force to the valve core 9, so that the valve core 9 blocks the overflow hole 10. When the hydraulic pressure in the second piston cavity is larger than the critical value of the overflow valve, the hydraulic oil overcomes the acting force of the overflow spring 8 to push the valve core 9, so that a passage between the valve core 9 and the valve body is opened, overflow is realized, when a certain amount of hydraulic oil overflows, the hydraulic pressure in the second piston cavity is reduced, the valve core 9 is reset under the action of the overflow spring 8, and the passage between the valve core 9 and the valve body is closed.
The valve core 9 of the embodiment of the invention adopts a funnel-shaped structure, and specifically, the valve core 9 comprises a conical part and a rod-shaped part which are integrated, the tip end of the conical part is connected with one end of the rod-shaped part, and the other end of the rod-shaped part is provided with a limit structure; the valve body through hole comprises a conical hole and a reducing hole, and the tip end of the conical hole is communicated with the thin end of the reducing hole; the shape and the size of the conical part are the same as those of the conical hole; the diameter of the rod-shaped part is equal to that of the thin end of the reducing hole; the overflow hole 10 is provided along the tapered hole diameter to the tapered surface of the tapered hole. The side wall of the conical part of the valve core 9 is mutually attached to the side wall of the conical hole of the valve body, and a sealing ring is arranged. The conical structure can be more favorable for leak protection sealing between the valve core 9 and the valve body relative to the cylindrical structure, and simultaneously when the overflow valve is opened, the conical structure can guide hydraulic oil to prevent the passage from being opened to instantaneously produce a certificate of hydraulic impact.
In order to further make the device of the embodiment of the present invention more compact, in the embodiment of the present invention, the housing of the first piston structure and the housing of the second piston structure are in an integral structure, and the axes of the first piston structure and the second piston structure are parallel, so as to reduce the radial dimension of the embodiment of the present invention.
In the embodiment of the invention, the small pressurizing and pressure maintaining device is also provided with a blind hole pipe which is communicated with the low-pressure oil way 7; the first piston structure and the second piston structure are communicated with the low-pressure oil circuit 7 through blind hole pipes. When in actual use, the low-pressure oil way 7 is directly communicated with the blind hole pipe, and the first through hole and the second through hole enable the thick end of the first hydraulic cavity and the second hydraulic cavity to be communicated with the low-pressure oil way 7.
In summary, the embodiment of the invention provides a small pressurizing and pressure maintaining device, in the pressure building process, the second piston is pushed by the elastic piece 5 to improve the pressure building speed, reduce the pressure building delay, improve the response speed of the hydraulic system and meet the requirement of quick response of the hydraulic system through the arrangement of the second piston structure; in the working process, the hydraulic response speed in the working process can be further improved by setting the second piston structure, and the elastic piece 5 can relieve the rapid fluctuation of the hydraulic pressure in the hydraulic system, so that the hydraulic system is prevented from being damaged due to hydraulic impact; after a period of operation, when the low-pressure oil channel 7 expands due to temperature and other reasons, the elastic piece 5 of the second piston structure is compressed, so that the increased volume of the hydraulic oil can be absorbed, the low-pressure oil channel 7 is prevented from being burst, and once the hydraulic oil expands excessively, excessive hydraulic oil is released through the overflow valve on the second piston 4, so that the low-pressure oil channel 7 is protected.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. A small-sized pressurizing and pressure maintaining device, characterized in that the small-sized pressurizing and pressure maintaining device comprises: a first piston structure and a second piston structure;
The first piston structure is provided with a first piston (2), the first piston (2) is a pressurizing piston, the thin part of the first piston (2) is communicated with the high-pressure oil path (1), and the thick part of the first piston (2) is communicated with the low-pressure oil path (7); one end of the second piston structure is communicated with the low-pressure oil way (7), and the other end of the second piston structure is communicated with the pressure relief oil way; the second piston structure is provided with a second piston (4), and the second piston (4) is driven by hydraulic oil of the elastic piece (5) and the low-pressure oil path (7) together;
The first piston structure further comprises a first piston chamber and a fuel tank cap (3);
the first piston cavity is a reducing cavity, the thin part of the first piston cavity and the thin part of the first piston (2) slide in a sealing way, and the thick part of the first piston cavity and the thick part of the first piston (2) slide in a sealing way; the thin part of the first piston cavity is communicated with the high-pressure oil passage (1), and the thick part of the first piston cavity is communicated with the low-pressure oil passage (7);
The oil tank cover (3) is fixedly arranged on the thick part of the first piston cavity in a sealing way and limits the sliding of the first piston (2) relative to the first piston cavity;
the second piston structure further comprises a second piston cavity and a limiting rod (6);
The second piston cavity is a cylindrical cavity, and the second piston cavity and the second piston (4) slide in a sealing manner relatively; the first end of the second piston cavity is communicated with a low-pressure oil way (7), and the second end of the second piston cavity is communicated with a pressure relief oil way;
the limiting rod (6) is fixedly arranged at the second end of the second piston cavity in a sealing way, and limits the sliding of the second piston (4) relative to the second piston cavity;
the limiting rod (6) is provided with an axial through hole, the second piston (4) is provided with an overflow valve, one end of the axial through hole is communicated with an outlet of the overflow valve on the second piston (4), and the other end of the axial through hole is communicated with a pressure relief oil path;
The elastic piece (5) is a spring and is partially sleeved on the limiting rod (6); one end of the elastic piece (5) is propped against the limiting rod (6), and the other end is propped against the second piston (4) and is in a compressed state;
the shells of the first piston structure and the second piston structure are of an integrated structure, and the axes of the first piston structure and the second piston structure are parallel;
The small pressurizing and pressure maintaining device is also provided with a blind hole pipe which is communicated with the low-pressure oil way (7); the first piston structure and the second piston structure are communicated with a low-pressure oil passage (7) through blind hole pipes;
When the hydraulic system is started to build pressure, the elastic piece (5) pushes the second piston (4) so that hydraulic oil in the second piston structure is pushed into the low-pressure oil path (7), even if a suction phenomenon occurs when the hydraulic pump is started in the pressure building process, the hydraulic lifting of the low-pressure oil path (7) can be ensured, and the pressure building delay caused by suction is eliminated; when the hydraulic system is in hydraulic adjustment in the normal process, the second piston (4) weakens the hydraulic change delay caused by the transfer fluctuation of the hydraulic pump under the combined action of the hydraulic oil of the low-pressure oil circuit (7) and the elastic piece (5); after the hydraulic system continuously works for a period of time, the hydraulic oil of the low-pressure oil way (7) is heated and expanded, the hydraulic oil of the low-pressure oil way (7) pushes the second piston (4) to compress the elastic piece (5) so as to absorb the expanded hydraulic oil of the low-pressure oil way (7), and if the expansion of the hydraulic oil of the low-pressure oil way (7) exceeds the bearing range of the second piston structure, excessive hydraulic oil flows out of an overflow valve of the second piston (4).
2. The small pressurization and pressure maintaining device according to claim 1, characterized in that the relief valve comprises a valve core (9), a relief orifice (10) and a relief spring (8);
The end face of the second piston (4) is provided with a valve body through hole; the overflow hole (10) is arranged on the end face of the second piston (4), and the valve core (9) passes through the valve body through hole;
The overflow spring (8) applies elasticity to the valve core (9) to enable the valve core (9) to block the overflow hole (10).
3. The small-sized pressurizing and pressure maintaining device according to claim 2, characterized in that the valve core (9) comprises an integrated conical part and a rod-shaped part, the tip of the conical part is connected with one end of the rod-shaped part, and the other end of the rod-shaped part is provided with a limit structure;
the valve body through hole comprises a conical hole and a reducing hole, and the tip end of the conical hole is communicated with the thin end of the reducing hole;
The shape and the size of the conical part are the same as those of the conical hole; the diameter of the rod-shaped part is equal to that of the thin end of the reducing hole.
4. A small pressurizing and pressure maintaining device according to claim 3, characterized in that the overflow aperture (10) is arranged radially along the cone aperture in the cone surface of the cone aperture.
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