CN111980982A - Positive displacement hydraulic safety device - Google Patents
Positive displacement hydraulic safety device Download PDFInfo
- Publication number
- CN111980982A CN111980982A CN202010727311.3A CN202010727311A CN111980982A CN 111980982 A CN111980982 A CN 111980982A CN 202010727311 A CN202010727311 A CN 202010727311A CN 111980982 A CN111980982 A CN 111980982A
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- oil
- positive displacement
- way valve
- displacement hydraulic
- valve
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Safety Valves (AREA)
Abstract
The embodiment of the invention discloses a positive displacement hydraulic safety device, which is based on a positive displacement cut-off safety device and has good performance and simple assembly, and mainly comprises three improvement aspects, wherein differential throttling realizes the function of constant volume cut-off, and when oil enters two paths of oil respectively through two throttling ports, hydraulic differential force is respectively formed in two cavities of a safety structure to generate hydraulic differential force, so that the safety structure in the safety device is pushed to utilize a positive displacement cut-off oil way; secondly, the return spring is utilized, after the work is stopped, the spring is in a compressed state due to the action of the safety structure, so that the safety structure can be pushed to the initial position by the return spring to realize the reset; the three chambers can only realize the cutting-off function of the oil circuit in the designated direction by using the one-way valve, and can not realize the reverse cutting-off function. The positive displacement hydraulic safety device provided by the embodiment of the invention has excellent performance and simple principle.
Description
Technical Field
The invention relates to the technical field of electro-hydraulic servo, in particular to a positive displacement hydraulic safety device.
Background
The hydraulic volume fuse assembly monitors the flow through the fuse assembly by the volume flowing through it. Under normal conditions, the flow of the hydraulic system is lower than the shut-off flow, and when the hydraulic system has abnormal conditions, the flow passing through the hydraulic system exceeds the shut-off flow and lasts for a rated time, the hydraulic flow insurance component is shut off to protect downstream hydraulic elements from further damage.
After the hydraulic oil flows into the hydraulic volume insurance component, the hydraulic oil is divided into a metering oil path and a main oil path in proportion, and the hydraulic volume insurance component is switched off by pushing the piston to move through the pressure difference between the metering oil path and the main oil path. The hydraulic volume insurance component has the minimum shut-off flow, and the hydraulic volume insurance component can be shut off only when the flow is larger than the minimum shut-off flow.
Disclosure of Invention
The purpose of the invention is as follows: the positive displacement hydraulic safety device is provided, and a constant-volume cutoff function is realized by utilizing the same-way differential hydraulic throttling; the position homing is realized under the condition of zero flow by utilizing a return spring; and a one-way cut-off function is realized by utilizing the one-way valve.
The technical scheme of the invention is as follows:
the embodiment of the invention provides a positive displacement hydraulic safety device, which comprises: the valve comprises a valve core, a valve sleeve and a shell, wherein the valve sleeve is sleeved outside the valve core;
wherein, the case includes insurance structure, and insurance structure sets up in the one end of being close casing oil inlet 1, and insurance structure includes: the differential piston 5, a first one-way valve and a second one-way valve, wherein the first one-way valve comprises a first one-way valve spring 2 and a first one-way valve ejector rod sleeved at one end of the first one-way valve spring 2, and the second one-way valve comprises a second one-way valve spring 6 and a second one-way valve ejector rod 7 sleeved at one end of the second one-way valve spring 6; a first check valve ejector rod is embedded into a base in the differential piston 5, a first containing cavity 4 is formed between the first check valve ejector rod and one end face of the differential piston 5, and a first throttling port 3 is formed in the first check valve ejector rod and used for conducting an oil path between the oil inlet 1 and the first containing cavity 4; the second one-way valve is arranged on the other end face of the differential piston 5, and forms a second containing cavity 13 together with the other end face of the differential piston 5 and the valve sleeve, and the valve sleeve is provided with a second throttle hole 12 at the position of the second containing cavity 13 and used for communicating an oil path from the oil inlet 1 to the second containing cavity 13 through an oil cavity between the valve body and the valve sleeve; the shell is also provided with an oil return port 10, and the valve sleeve is provided with an oil return window 11 for guiding oil in the second cavity 13;
the differential piston 5 in the safety structure is used for pushing the differential piston 5 to move to cut off an oil path between the oil inlet 1 and the oil return port 10 through hydraulic pressure difference power formed between the first cavity 4 and the second cavity 13.
Optionally, in the positive displacement hydraulic safety device as described above, the cross-sectional area of the first chamber 4 is larger than the cross-sectional area of the second chamber 13 by a preset ratio.
Optionally, in the positive displacement hydraulic safety device as described above, the spool further includes: an on-off piston 8 and a return spring 9;
the on-off piston 8 comprises a small end part and a large end part which are communicated, the small end part is sleeved outside the second one-way valve, a return spring 9 is embedded in the large end part, and one end of the return spring 9 abuts against the end part of the valve sleeve; a conduction window is arranged between the small end part and the large end part.
Alternatively, in the positive displacement hydraulic fuse device as described above,
the positive displacement hydraulic safety device is used for dividing oil flowing in from an oil inlet 1 into two paths, a first oil path flows into a first containing cavity 4 through a first throttling port 3 in a first one-way valve, a second oil path flows into a second containing cavity 13 through an oil cavity between a valve body and a valve sleeve and a second throttling port 12, and the on-off piston 8 is pushed to move to one side of an extrusion reset spring 9 through oil pressure flowing into the second containing cavity 13 and moves to a conduction window to be communicated with an oil return window 11, so that the oil path from the oil inlet 1 to an oil return port 10 is communicated.
Alternatively, in the positive displacement hydraulic fuse device as described above,
the positive displacement hydraulic safety device is also used for driving the two oil paths to flow into the first containing cavity 4 and the second containing cavity 13 through the two throttling ports, generating hydraulic differential force acting on the differential piston 5 through oil in the first containing cavity 4 and the second containing cavity 13, pushing the differential piston 5 to move towards one side of the second containing cavity 13, and closing the second throttling hole 12 through the movement of the differential piston 5, so that the oil path between the oil inlet 1 and the oil return port 10 is cut off.
Alternatively, in the positive displacement hydraulic fuse device as described above,
in the process that the positive displacement hydraulic safety device pushes the differential piston 5 to move towards one side of the second cavity 13 under the action of hydraulic differential force, the volume of oil in the first cavity 4 is gradually increased, and when the volume of the oil is increased to a preset volume value, an oil way is cut off, so that the cutting-off function when the volume of the oil in the first cavity 4 reaches the preset volume value is realized.
Alternatively, in the positive displacement hydraulic fuse device as described above,
the positive displacement hydraulic safety device is also used for pushing the on-off piston 8 to move towards one side close to the differential piston 5 through the reverse acting force of the return spring 9 when the oil inlet 1 cuts off oil or the oil pressure drops, so that the differential piston 5 is pushed to move and the second throttling opening 12 is communicated, and the oil circuit is recovered to be communicated; in the process of moving the differential piston 5, the first one-way valve mandril is ejected out of the base of the differential piston 5 through the oil pressure in the first cavity 4, so that the positive displacement hydraulic safety device is quickly restored to the initial state.
Alternatively, in the positive displacement hydraulic fuse device as described above,
the positive displacement hydraulic safety device is also used for pushing the second one-way valve to compress towards the small end part when the oil return port 10 is used as an oil inlet and oil flows in, so that the conduction window is exposed through the movement of the second one-way valve ejector rod 7, and an oil path between the oil return port 10 and the oil inlet 1 is communicated through the conduction window.
The invention has the advantages that:
the volume type hydraulic safety device provided by the embodiment of the invention is based on a volume type cut-off safety device, is designed with a volume type hydraulic safety device with good performance and simple assembly, and mainly comprises three improvement aspects, wherein on the first aspect, differential throttling realizes a constant volume cut-off function, and when oil enters two paths of oil respectively pass through two throttling ports, hydraulic differential force is respectively formed in two cavities of a safety structure to generate, so that the safety structure in the safety device is pushed to utilize a volume cut-off oil path; in the second aspect, by utilizing the return spring, after the work is stopped, the spring is in a compressed state due to the action of the safety structure, so that the safety structure can be pushed to the initial position by the return spring to realize the return; in the third aspect, only the function of cutting off the oil passage in the specified direction is realized by the check valve, and the reverse cutting-off function cannot be realized. The volume type hydraulic safety device provided by the embodiment of the invention utilizes the difference of the aperture sizes of the throttling holes to generate differential hydraulic pressure, thereby realizing the function of constant volume cutoff; in addition, the reset spring is arranged to realize position homing; furthermore, a one-way cut-off function is realized by using the one-way valve. The positive displacement hydraulic safety device provided by the embodiment of the invention has excellent performance and simple principle.
Description of the drawings:
fig. 1 is a schematic structural diagram of a positive displacement hydraulic safety device according to an embodiment of the present invention;
fig. 2 is a partially enlarged schematic view of a safety structure in the positive displacement hydraulic safety device provided in the embodiment shown in fig. 1.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The volume type hydraulic safety device provided by the embodiment of the invention is mainly based on three aspects: firstly, a constant volume cutoff function is realized by utilizing the same-way differential hydraulic throttling; firstly, the position homing is realized by utilizing a return spring under the condition of zero flow; firstly, one-way cut-off function is realized by utilizing the one-way valve.
Fig. 1 is a schematic structural diagram of a positive displacement hydraulic safety device according to an embodiment of the present invention, and fig. 2 is a partially enlarged schematic structural diagram of a safety structure in the positive displacement hydraulic safety device according to the embodiment of fig. 1. The positive displacement hydraulic safety device provided by the embodiment of the invention can comprise: the valve comprises a valve core, a valve sleeve and a shell, wherein the valve sleeve is sleeved outside the valve core, and the shell is sleeved outside the valve sleeve.
Referring to the structure of the positive displacement hydraulic safety device shown in fig. 1 and 2, the valve core comprises a safety structure, the safety structure is arranged at one end close to the oil inlet 1 of the shell, and the safety structure comprises: the differential piston 5, a first one-way valve and a second one-way valve, wherein the first one-way valve comprises a first one-way valve spring 2 and a first one-way valve ejector rod sleeved at one end of the first one-way valve spring 2, and the second one-way valve comprises a second one-way valve spring 6 and a second one-way valve ejector rod 7 sleeved at one end of the second one-way valve spring 6; a first check valve ejector rod is embedded into a base in the differential piston 5, a first containing cavity 4 is formed between the first check valve ejector rod and one end face of the differential piston 5, and a first throttling port 3 is formed in the first check valve ejector rod and used for conducting an oil path between the oil inlet 1 and the first containing cavity 4; the second one-way valve is arranged on the other end face of the differential piston 5, and forms a second containing cavity 13 together with the other end face of the differential piston 5 and the valve sleeve, and the valve sleeve is provided with a second throttle hole 12 at the position of the second containing cavity 13 and used for communicating an oil path from the oil inlet 1 to the second containing cavity 13 through an oil cavity between the valve body and the valve sleeve; the housing is further provided with an oil return port 10, and the valve sleeve is provided with an oil return window 11 for guiding oil in the second cavity 13.
The differential piston 5 in the safety structure of the embodiment of the invention is used for pushing the differential piston 5 to move to cut off an oil path between the oil inlet 1 and the oil return opening 10 through hydraulic pressure difference power formed between the first cavity 4 and the second cavity 13.
In practical application of the embodiment of the present invention, the sectional area of the first cavity 4 is larger than the sectional area of the second cavity 13 according to a preset ratio.
In the positive displacement hydraulic safety device provided by the embodiment of the invention, the valve core further comprises: an on-off piston 8 and a return spring 9.
The on-off piston 8 in the embodiment of the invention comprises a small end part and a large end part which are communicated, the small end part is sleeved outside the second one-way valve, the large end part is embedded with the return spring 9, and one end of the return spring 9 is abutted against the end part of the valve sleeve; a conduction window is arranged between the small end part and the large end part.
The working principle of the volume type hydraulic safety device provided by the embodiment of the invention comprises the following steps: the oil flowing into the oil inlet 1 is divided into two paths, the first oil path flows into the first containing cavity 4 through the first throttling port 3 in the first one-way valve, the second oil path flows into the second containing cavity 13 through the oil cavity between the valve body and the valve sleeve and the second throttling port 12, the on-off piston 8 is pushed to move to one side of the extrusion reset spring 9 through the oil pressure flowing into the second containing cavity 13, and the on-off piston moves to the conduction window to be communicated with the oil return window 11, so that the oil path from the oil inlet 1 to the oil return port 10 is communicated.
The working principle of the positive displacement hydraulic safety device provided by the embodiment of the invention also comprises the following steps: after the two oil paths flow into the first cavity 4 and the second cavity 13 through the two throttles, the oil in the first cavity 4 and the second cavity 13 generates a hydraulic differential force acting on the differential piston 5, the differential piston 5 is pushed to move towards one side of the second cavity 13, and the second throttle 12 is closed through the movement of the differential piston 5, so that the oil path between the oil inlet 1 and the oil return opening 10 is cut off.
In the specific implementation process, in the process that the positive displacement hydraulic safety device pushes the differential piston 5 to move towards one side of the second cavity 13 under the action of the hydraulic differential force, the volume of the oil in the first cavity 4 is gradually increased, and when the volume of the oil is increased to a preset volume value, the oil way is cut off, so that the cutting-off function when the volume of the oil in the first cavity 4 reaches the preset volume value is realized.
The reset process of the volume type hydraulic safety device provided by the embodiment of the invention comprises the following steps: due to the existence of the return spring 9, the return spring 9 is in a compressed state after the safety device is cut off due to the increase of the volume, and then when the oil inlet 1 cuts off oil or the oil pressure is reduced, the on-off piston 8 is pushed to move to one side close to the differential piston 5 through the reverse acting force of the return spring 9, so that the differential piston 5 is pushed to move and the second throttling opening 12 is conducted to recover the conduction oil path; in the process of moving the differential piston 5, the first one-way valve mandril is ejected out of the base of the differential piston 5 through the oil pressure in the first cavity 4, so that the positive displacement hydraulic safety device is quickly restored to the initial state.
The one-way action principle of the volume type hydraulic safety device provided by the embodiment of the invention is as follows:
when the oil return port 10 is used as an oil inlet and oil flows in, the second one-way valve is pushed to be compressed towards the small end part, so that the conduction window is exposed through the movement of the second one-way valve ejector rod 7, and an oil path between the oil return port 10 and the oil inlet 1 is communicated through the conduction window.
The volume type hydraulic safety device provided by the embodiment of the invention is based on a volume type cut-off safety device, is designed with a volume type hydraulic safety device with good performance and simple assembly, and mainly comprises three improvement aspects, wherein on the first aspect, differential throttling realizes a constant volume cut-off function, and when oil enters two paths of oil respectively pass through two throttling ports, hydraulic differential force is respectively formed in two cavities of a safety structure to generate, so that the safety structure in the safety device is pushed to utilize a volume cut-off oil path; in the second aspect, by utilizing the return spring, after the work is stopped, the spring is in a compressed state due to the action of the safety structure, so that the safety structure can be pushed to the initial position by the return spring to realize the return; in the third aspect, only the function of cutting off the oil passage in the specified direction is realized by the check valve, and the reverse cutting-off function cannot be realized. The volume type hydraulic safety device provided by the embodiment of the invention utilizes the difference of the aperture sizes of the throttling holes to generate differential hydraulic pressure, thereby realizing the function of constant volume cutoff; in addition, the reset spring is arranged to realize position homing; furthermore, a one-way cut-off function is realized by using the one-way valve. The positive displacement hydraulic safety device provided by the embodiment of the invention has excellent performance and simple principle.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A positive displacement hydraulic fuse device, comprising: the valve comprises a valve core, a valve sleeve and a shell, wherein the valve sleeve is sleeved outside the valve core;
wherein, the case includes insurance structure, and insurance structure sets up in the one end of being close casing oil inlet (1), and insurance structure includes: the differential piston (5), a first one-way valve and a second one-way valve, wherein the first one-way valve comprises a first one-way valve spring (2) and a first one-way valve ejector rod sleeved at one end of the first one-way valve spring (2), and the second one-way valve comprises a second one-way valve spring (6) and a second one-way valve ejector rod (7) sleeved at one end of the second one-way valve spring (6); a first check valve ejector rod is embedded into a base in the differential piston (5) and forms a first containing cavity (4) with one end face of the differential piston (5), and a first throttling port (3) is arranged on the first check valve ejector rod and used for conducting an oil path between the oil inlet (1) and the first containing cavity (4); the second one-way valve is arranged on the other end face of the differential piston (5), a second containing cavity (13) is formed by the second one-way valve, the other end face of the differential piston (5) and the valve sleeve, and a second throttling hole (12) is formed in the position, located in the second containing cavity (13), of the valve sleeve and used for communicating an oil path from the oil inlet (1) to the second containing cavity (13) through an oil cavity between the valve body and the valve sleeve; the shell is also provided with an oil return port (10), and the valve sleeve is provided with an oil return window (11) for guiding oil in the second cavity (13);
and the differential piston (5) in the safety structure is used for pushing the differential piston (5) to move to cut off an oil path between the oil inlet (1) and the oil return port (10) through hydraulic pressure difference power formed between the first accommodating cavity (4) and the second accommodating cavity (13).
2. A positive-displacement hydraulic fuse as claimed in claim 1, characterized in that the cross-sectional area of the first chamber (4) is greater than the cross-sectional area of the second chamber (13) by a predetermined ratio.
3. The positive displacement hydraulic fuse device of claim 1, wherein the spool further comprises: an on-off piston (8) and a return spring (9);
the on-off piston (8) comprises a small end part and a large end part which are communicated, the small end part is sleeved outside the second one-way valve, a return spring (9) is embedded in the large end part, and one end of the return spring (9) abuts against the end part of the valve sleeve; a conduction window is arranged between the small end part and the large end part.
4. A positive displacement hydraulic fuse as claimed in claim 3,
the positive displacement hydraulic safety device is used for dividing oil flowing into an oil inlet (1) into two ways, a first oil way flows into a first containing cavity (4) through a first throttling port (3) in a first one-way valve, a second oil way flows into a second containing cavity (13) through an oil cavity between a valve body and a valve sleeve and a second throttling port (12), and through oil pressure flowing into the second containing cavity (13), an on-off piston (8) is pushed to move to one side of an extrusion reset spring (9), and the on-off piston moves to be communicated with an oil return window (11) so as to communicate the oil way from the oil inlet (1) to an oil return port (10).
5. The positive displacement hydraulic fuse device of claim 4,
the positive displacement hydraulic safety device is also used for generating hydraulic differential force acting on the differential piston (5) through oil in the first accommodating cavity (4) and the second accommodating cavity (13) after the two oil paths flow into the first accommodating cavity (4) and the second accommodating cavity (13) through the two throttling ports, pushing the differential piston (5) to move towards one side of the second accommodating cavity (13), and closing the second throttling port (12) through the movement of the differential piston (5), so that the oil path between the oil inlet (1) and the oil return port (10) is cut off.
6. The positive displacement hydraulic fuse as claimed in claim 5,
the positive displacement hydraulic safety device pushes the differential piston (5) to move towards one side of the second accommodating cavity (13) under the action of the hydraulic differential force, the volume of oil in the first accommodating cavity (4) is gradually increased, and when the volume of the oil is increased to a preset volume value, an oil way is cut off, so that the cutting-off function when the volume of the oil in the first accommodating cavity (4) reaches the preset volume value is realized.
7. The positive displacement hydraulic fuse as claimed in claim 5,
the positive displacement hydraulic safety device is also used for pushing the on-off piston (8) to move to one side close to the differential piston (5) through the reverse acting force of the return spring (9) when the oil inlet (1) cuts off oil or the oil pressure drops, so that the differential piston (5) is pushed to move and the second throttling opening (12) is conducted to recover the conduction oil way; in the moving process of the differential piston (5), the first one-way valve ejector rod is ejected out of the base of the differential piston (5) through the oil pressure in the first cavity (4), so that the positive displacement hydraulic safety device is quickly restored to the initial state.
8. The positive displacement hydraulic fuse as claimed in claim 5,
the positive displacement hydraulic safety device is also used for pushing the second one-way valve to compress towards the small end part when the oil return port (10) is used as an oil inlet and oil flows in, so that the conduction window is exposed through the movement of the second one-way valve ejector rod (7), and an oil path between the oil return port (10) and the oil inlet (1) is communicated through the conduction window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727311.3A CN111980982B (en) | 2020-07-24 | 2020-07-24 | Positive displacement hydraulic safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727311.3A CN111980982B (en) | 2020-07-24 | 2020-07-24 | Positive displacement hydraulic safety device |
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| Publication Number | Publication Date |
|---|---|
| CN111980982A true CN111980982A (en) | 2020-11-24 |
| CN111980982B CN111980982B (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010727311.3A Active CN111980982B (en) | 2020-07-24 | 2020-07-24 | Positive displacement hydraulic safety device |
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| CN (1) | CN111980982B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294283A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and multi-way valve |
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2020
- 2020-07-24 CN CN202010727311.3A patent/CN111980982B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114294283A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and multi-way valve |
| CN114294283B (en) * | 2021-12-26 | 2024-04-09 | 浙江海宏液压科技股份有限公司 | Working valve plate and multi-way valve |
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| Publication number | Publication date |
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| CN111980982B (en) | 2022-11-22 |
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