CN111894948A - High oil pressure equipment protection device and hydraulic pressure operating mechanism - Google Patents
High oil pressure equipment protection device and hydraulic pressure operating mechanism Download PDFInfo
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- CN111894948A CN111894948A CN202010628491.XA CN202010628491A CN111894948A CN 111894948 A CN111894948 A CN 111894948A CN 202010628491 A CN202010628491 A CN 202010628491A CN 111894948 A CN111894948 A CN 111894948A
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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Abstract
The invention relates to the field of hydraulic system protection devices, in particular to a high oil pressure equipment protection device and a hydraulic operating mechanism. The high oil pressure equipment protection device comprises a shell, a piston, a return spring, a switch and a switch trigger piece, wherein a high-pressure oil inlet is formed in the shell, the piston is arranged in the shell, the high-pressure oil inlet is positioned at one end of the piston, oil entering from the high-pressure oil inlet exerts a first force on the piston, and the return spring exerts a second force opposite to the first force on the piston to drive the piston to reset; the switch is fixed on the shell, and the on-off state of the switch corresponds to the normal state and the abnormal state of the oil pressure of the high-oil-pressure equipment, or the on-off state of the switch corresponds to the abnormal state and the normal state of the oil pressure of the high-oil-pressure equipment; the switch trigger piece is movably arranged on the shell and used for switching the on-off state of the switch under the action of the piston and the return spring. When the high oil pressure equipment protection device of the present invention is applied to high oil pressure equipment, it can indicate normal and abnormal states of oil pressure in the equipment.
Description
Technical Field
The invention relates to the field of hydraulic system protection devices, in particular to a high oil pressure equipment protection device and a hydraulic operating mechanism.
Background
In some devices requiring high-pressure oil, such as an operating mechanism, because the oil pressure in a high-pressure oil path/oil chamber is relatively high, if the high-pressure oil path/oil chamber is not protected, the high-pressure oil path/oil chamber is easy to cause the problem of damaging the device. In the prior art, two main protection modes for a hydraulic system are provided, one mode is to arrange a pressure relief device, and when the pressure in the system reaches a set value, the pressure is automatically relieved. The other method is to adopt an open-loop or closed-loop control mode, when the pressure in the system reaches a set value, an alarm indication is given, the oil pump is manually operated to reduce or stop the oil supply to the system, or the oil pump is directly and automatically controlled to reduce or stop the oil supply to the system.
However, for equipment requiring high-pressure oil, in addition to preventing the equipment from being damaged due to overhigh pressure, the oil pressure state in the equipment needs to be mastered in real time so as to avoid the problem of poor operation due to overlow oil pressure in the equipment.
Disclosure of Invention
The invention aims to provide a high oil pressure equipment protecting device which is used for protecting high oil pressure equipment and preventing the problem of poor operation caused by overhigh or overlow pressure.
Meanwhile, the invention also aims to provide a hydraulic operating mechanism using the high-oil-pressure equipment protection device.
The high oil pressure equipment protection device adopts the following technical scheme: the high oil pressure equipment protection device includes:
the high-pressure oil inlet is formed in the shell;
the piston is arranged in the shell, the high-pressure oil inlet is positioned at one end of the piston, and oil entering from the high-pressure oil inlet can apply a first force to the piston;
a return spring for applying a second force to the piston opposite to the first force for urging the piston to return;
a switch fixed on the housing, wherein the on/off state of the switch corresponds to a normal state and an abnormal state of the oil pressure of the high oil pressure equipment, or the on/off state of the switch corresponds to an abnormal state and a normal state of the oil pressure of the high oil pressure equipment;
and the switch trigger piece is movably arranged on the shell and used for switching the on-off state of the switch under the action of the piston and the return spring.
Has the advantages that: when the high-oil-pressure equipment protection device is applied to high-oil-pressure equipment, a high-pressure oil inlet of the shell is connected with a high-pressure oil cavity or a high-pressure oil pipeline of the high-oil-pressure equipment, high-pressure oil in the equipment provides a first force for the piston, and overcomes a second force of the return spring, which is opposite to the first force, so that the piston is pushed to act, a switch trigger is driven, the state of the switch is switched, and the normal and abnormal states of the oil pressure of the equipment are indicated; for example, when the switch normality indicates a normal state of the oil pressure in the equipment, the switch indicates an abnormal state of the oil pressure in the equipment, and when the switch normality indicates an abnormal state of the oil pressure in the equipment, the switch indicates a normal state of the oil pressure in the equipment.
Furthermore, the shell is internally provided with an automatic pressure relief channel and a valve core for controlling the on-off of the pressure relief channel, the automatic pressure relief channel is provided with an automatic pressure relief inlet, the automatic pressure relief inlet is sealed by the valve core, the valve core is movably assembled on the piston and is provided with a position compensating spring between the piston and the position compensating spring, the position compensating spring provides a third force with the same direction as the second force to the valve core, when the piston moves under the first thrust, the valve core keeps sealing the automatic pressure relief inlet under the action of the third force, and after the piston moves under the first thrust for setting the stroke, the valve core leaves the automatic pressure relief inlet. The automatic pressure relief channel can actively relieve the pressure of the equipment when the oil pressure in the corresponding equipment is too high, and the equipment is stopped from being damaged due to the too high oil pressure; the valve body is attached to the piston in order to improve the compactness of the entire device.
Furthermore, a valve core cavity is arranged in the piston, the valve core is installed in the valve core cavity, and a pressure balance channel is arranged on the valve core and communicated with the inside and the outside of the valve core cavity. The pressure balance channel is used for balancing oil pressure between two ends of the valve core, so that the specification of the position supplementing spring can be reduced, the requirement on the position supplementing spring is lowered, or the valve core can be more sensitively actuated and the pressure relief channel can be more reliably sealed under the condition that the specifications of the position supplementing spring are the same.
Furthermore, the position compensating spring is a pressure spring arranged in the valve core cavity. Compared with a tension spring, the pressure spring is easier to arrange and simpler in structure.
Furthermore, a one-way valve is arranged on the high-pressure oil inlet of the shell or between the high-pressure oil inlet and the piston, and a valve core of the one-way valve is provided with a spring and a damping hole. The one-way valve and the damping hole have the functions that when the oil pressure in the equipment is normally and instantaneously reduced, the protection device of the invention cannot report false alarm, and when the oil pressure in the equipment is really reduced abnormally, the abnormal situation can be reported finally.
Furthermore, the valve core of the one-way valve is assembled in the valve body of the one-way valve along a straight line in a guiding way, a transverse channel crossed with the moving direction and a longitudinal channel same with the moving direction are arranged on the valve core, a channel is arranged between at least one end of the transverse channel and the inner wall of the valve body of the one-way valve, and the damping hole is arranged at the front end of the valve core of the one-way valve and communicated with the transverse channel. The one-way valve is in guide fit with the valve body, so that the damping hole can play a role stably, and the problem that the damping hole is not aligned with a high-pressure oil inlet when the valve ball is reset probably occurs if a valve core of the one-way valve adopts a valve ball.
Furthermore, a manual pressure relief channel is further arranged in the shell, and is provided with a manual pressure relief operating rod for opening and cutting off the manual pressure relief channel. The manual pressure relief channel and the manual pressure relief operating rod can further play a role in protecting equipment, and when the switch gives an abnormal high-voltage signal, pressure can be released through the manual pressure relief channel to protect the equipment.
Furthermore, the switch trigger is provided with a mandril matched with the switch, and the mandril is adjustable along the axial position to adapt to the indication of different oil pressure thresholds. The ejector pin of position adjustable can adapt to the demand of multiple different equipment.
Furthermore, the switch trigger comprises a main rod matched with the shell in a guiding mode, the main rod is matched with the piston in a propping mode, and the reset spring is arranged between the main rod and the shell. The main rod structure which is matched with the piston in a propping mode is simpler, and the processing and the assembly are easier to realize.
The hydraulic operating mechanism adopts the following technical scheme: the hydraulic operating mechanism comprises a high-pressure oil cavity and a high-pressure oil pipe, wherein the high-pressure oil cavity and/or the high-pressure oil pipe are/is connected with a high-oil-pressure equipment protection device, and the high-oil-pressure equipment protection device comprises:
the high-pressure oil inlet is formed in the shell;
the piston is arranged in the shell, the high-pressure oil inlet is positioned at one end of the piston, and oil entering from the high-pressure oil inlet can apply a first force to the piston;
a return spring for applying a second force to the piston opposite to the first force for urging the piston to return;
a switch fixed on the housing, wherein the on/off state of the switch corresponds to a normal state and an abnormal state of the oil pressure of the high oil pressure equipment, or the on/off state of the switch corresponds to an abnormal state and a normal state of the oil pressure of the high oil pressure equipment;
and the switch trigger piece is movably arranged on the shell and used for switching the on-off state of the switch under the action of the piston and the return spring.
Furthermore, the shell is internally provided with an automatic pressure relief channel and a valve core for controlling the on-off of the pressure relief channel, the automatic pressure relief channel is provided with an automatic pressure relief inlet, the automatic pressure relief inlet is sealed by the valve core, the valve core is movably assembled on the piston and is provided with a position compensating spring between the piston and the position compensating spring, the position compensating spring provides a third force with the same direction as the second force to the valve core, when the piston moves under the first thrust, the valve core keeps sealing the automatic pressure relief inlet under the action of the third force, and after the piston moves under the first thrust for setting the stroke, the valve core leaves the automatic pressure relief inlet.
Furthermore, a valve core cavity is arranged in the piston, the valve core is installed in the valve core cavity, and a pressure balance channel is arranged on the valve core and communicated with the inside and the outside of the valve core cavity.
Furthermore, the position compensating spring is a pressure spring arranged in the valve core cavity.
Furthermore, a one-way valve is arranged on the high-pressure oil inlet of the shell or between the high-pressure oil inlet and the piston, and a valve core of the one-way valve is provided with a spring and a damping hole.
Furthermore, the valve core of the one-way valve is assembled in the valve body of the one-way valve along a straight line in a guiding way, a transverse channel crossed with the moving direction and a longitudinal channel same with the moving direction are arranged on the valve core, a channel is arranged between at least one end of the transverse channel and the inner wall of the valve body of the one-way valve, and the damping hole is arranged at the front end of the valve core of the one-way valve and communicated with the transverse channel.
Furthermore, a manual pressure relief channel is further arranged in the shell, and is provided with a manual pressure relief operating rod for opening and cutting off the manual pressure relief channel.
Furthermore, the switch trigger is provided with a mandril matched with the switch, and the mandril is adjustable along the axial position to adapt to the indication of different oil pressure thresholds.
Furthermore, the switch trigger comprises a main rod matched with the shell in a guiding mode, the main rod is matched with the piston in a propping mode, and the reset spring is arranged between the main rod and the shell.
The technical scheme of the hydraulic operating mechanism has the beneficial effects brought by the adoption of the high oil pressure equipment protection device, and the beneficial effects of the technical scheme of the high oil pressure equipment protection device can be specifically referred to, and are not repeated herein.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a high oil pressure equipment protector according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at X;
FIG. 3 is a schematic diagram of the high oil pressure equipment protection device of FIG. 1 (with the manual bleed passage open);
fig. 4 is a schematic diagram of the high oil pressure equipment protection device in fig. 1 (equipment oil pressure normal state);
fig. 5 is a schematic diagram of the high oil pressure equipment protection device in fig. 1 (an excessively high equipment oil pressure state).
In the figure: 1-a shell, 11-a valve body part, 12-a support part, 13-a shell sealing ring, 2-a piston, 21-a piston sealing ring, 22-a piston shaft seal, 3-a switch, 31-a switch bracket, 4-a switch trigger, 41-a trigger rod, 42-a linear bearing, 43-a first spring seat, 44-a second spring seat, 45-a trigger rod shaft seal, 46-a locking nut, 47-a plate seat, 48-a mandril, 5-a return spring, 6-a one-way valve, 61-a one-way valve body, 62-a one-way valve core, 63-a valve closing spring, 64-a valve sealing ring, 65-a transverse channel, 66-a longitudinal channel, 67-a damping hole, 7-a manual pressure relief operating rod, 71-an operating rod back cap, 72-operating rod sealing ring, 73-valve ball, 8-valve core, 81-pressure balance channel, 82-baffle, 83-clamp spring, 9-screw, 91-screw back cap, 92-first screw sealing ring, 93-second screw sealing ring and 10-position compensation spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the protection scope of the invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below in conjunction with the following embodiments.
When some hydraulic equipment works normally, the high-pressure oil chamber and the pipeline communicated with the high-pressure oil chamber can keep very high pressure, and due to the fact that the working pressure of the hydraulic equipment is high, if a fault and overpressure condition occur, a hydraulic system is possibly damaged under the ultrahigh pressure, and safety accidents are caused. Meanwhile, the operation of these devices often has a very wide range of influence, and taking the operating mechanism as an example, whether it can operate normally or not directly influences the normal power consumption and the safe power consumption of an area. In addition to ensuring that it cannot be damaged by excessive pressure, it is therefore necessary to ensure that it has a normal operating pressure, since the device would also not operate properly if the pressure is too low.
As can be seen from the above description, to ensure the normal operation of a high oil pressure device, it is necessary to find an abnormal state of an excessively high or excessively low oil pressure at least in time, and then perform corresponding processing on the abnormal state manually or automatically. The protection device for high oil pressure equipment according to the present invention is proposed based on the above-mentioned needs.
The core of the high oil pressure equipment protection device is that the fluctuation of high oil pressure in the high oil pressure equipment is converted into the operation of the piston, and then the piston drives the switch trigger piece to change the on-off state of the switch, so that the normal and abnormal working states of the high oil pressure equipment are reflected by different states of the switch, and the function of protecting the high oil pressure equipment can be achieved. Furthermore, the high oil pressure equipment protection device is also provided with an automatic pressure relief channel and a manual pressure relief channel, when the high oil pressure equipment has a fault of overhigh pressure, the pressure can be timely released through the automatic pressure relief channel and the manual pressure relief channel, and therefore the high oil pressure equipment is prevented from being damaged due to overhigh oil pressure.
The embodiment of the high oil pressure equipment protector according to the present invention will be described below with reference to specific examples:
as shown in fig. 1 to 5, the main components of the high oil pressure equipment protection device are a housing 1, a piston 2, a switch 3, a switch trigger 4, and a return spring 5.
The structure of the housing 1 is shown in fig. 1, and is composed of a valve body portion 11 and a support portion 12. The valve body part 11 is provided with a high-pressure oil inlet and a pressure relief opening, the high-pressure oil inlet is provided with a one-way valve 6, and the pressure relief opening is provided with a pressure relief joint. As shown in fig. 1 and 5, the check valve 6 includes a check valve body 61, a check valve core 62 and a valve closing spring 63, and in order to ensure the sealing with the housing 1, two valve sealing rings 64 are arranged between the check valve body 61 and the housing 1, and the valve sealing rings 64 are formed by a metal sealing ring and a flexible sealing ring; the check valve core 62 is composed of two unequal cylinders, is slidably assembled in the check valve body 61, and is provided with a transverse channel 65 (located on the smaller cylinder of the valve core) intersecting with the moving direction and a longitudinal channel 66 having the same moving direction, wherein a channel is arranged between two ends of the transverse channel and the inner wall of the check valve body 61, and in the embodiment, the channel is specifically composed of the interval between the smaller cylinder section of the check valve core 62 and the inner wall of the check valve body 61. The check valve core 62 is provided with a damping hole 67, and the damping hole 67 is arranged at the front end of the check valve core 62 and communicated with the transverse channel. The valve closing spring is arranged between the one-way valve body and the one-way valve core in a jacking mode and used for driving the one-way valve core to close the one-way valve, and therefore the valve closing spring is called as a valve closing spring.
When the oil tank is used, the high-pressure oil inlet is connected with high-pressure oil of equipment, and the pressure relief opening is connected with the oil tank. Set up manual pressure release passageway and automatic pressure release passageway between high pressure oil import and the high pressure oil export, be parallel relation between manual pressure release passageway and the automatic pressure release passageway, the two shares one section respectively at the most upper reaches and the most low reaches, manual pressure release passageway carries out the break-make operation through installing manual pressure release action bars 7 on the valve body part 11 of casing 1, manual pressure release action bars 7 passes through the screw assembly on the valve body part 11 of casing, action bars back of the body cap 71 has been set up between its outer end and casing 1, be used for after manual pressure release action bars 7 adjusts to the position of settlement, back of the body tightly manual pressure release action bars 7, in order to guarantee the sealed of manual pressure release action bars 7 and casing 1 cooperation department, last 7 of manual pressure release action bars has set up action bars sealing washer 72. The inner end of the manual pressure relief operating rod 7 is provided with a valve ball 73, and when the manual pressure relief operating rod works, the on-off of a manual pressure relief channel is adjusted through the valve ball 73. The automatic pressure relief channel is controlled by one valve core 8, a port matched with the valve core 8 is arranged on the end face of one screw rod 9, meanwhile, a switching channel is arranged on the screw rod 9, the switching channel forms a part of the automatic pressure relief channel, and when the oil pressure in the equipment is too large, the valve core 8 moves, so that the communication of the automatic pressure relief channel is realized. In order to ensure the reliability of the screw 9, a screw back cap 91 is arranged between the screw 9 and the housing 1 for locking the screw 9, and in order to ensure the sealing between the inner end of the screw 9 and the inner wall of the housing 1, a first screw sealing ring 92 and a second screw sealing ring 93 are respectively arranged on the screw 9, wherein the second screw sealing ring 93 is a sealing ring with a metal sealing ring.
In addition to the above-described structure, the valve body portion 11 of the housing 1 is provided with a piston chamber which communicates with the high-pressure oil inlet and which penetrates the wall of the corresponding side of the valve body portion, as shown in fig. 1, the piston chamber being disposed coaxially with the screw 9 and coaxial with the port on the screw 9 where the spool 8 is fitted.
The supporting portion 12 of the housing 1 is fixedly connected with the valve body portion 11, and is specifically in a cylindrical shape with an opening at one end, the opening end of the supporting portion 12 and the valve body portion are provided with a plug bush type structure at the joint of the two, and in order to ensure the sealing of the joint of the two, a housing sealing ring 13 is further arranged at the plug bush type structure.
The piston 2 is arranged in a piston mounting chamber of the shell 1, one end of the piston mounting chamber is communicated with a high-pressure oil inlet of the shell 1, therefore, oil entering from the high-pressure oil inlet can provide a first force in a first direction for the piston 2, in order to ensure the sealing fit between the piston 2 and the wall of the piston mounting chamber, a piston ring and a piston sealing ring 21 are arranged on the piston 2, and the piston sealing ring 21 is of an outer metal and inner rubber structure. The end of the piston 2 facing away from the high pressure oil inlet passes through the wall of the housing and a piston shaft seal 22 is provided between the end and the wall of the housing.
In this embodiment, a valve core chamber is disposed at one end of the piston 2 close to the high-pressure oil inlet, the valve core 8 of the automatic pressure relief channel is installed in the valve core chamber, and is prevented from dropping out by a baffle 82 and a snap spring 83 disposed at an opening of the valve core chamber, a pressure balance channel 81 is disposed on the valve core 8, the pressure balance channel 81 is communicated with the inside and the outside of the valve core chamber, the valve core 8 is in guiding fit with the piston 2 along the axial direction of the piston 2, a position compensating spring 10 is disposed between the inner end of the valve core 8 and the piston 2, in an initial state, the valve core 8 is pressed against a port of the screw 9, which is engaged with the screw, and blocks the automatic pressure relief channel, at this time, the position compensating spring 10 is in a compressed state, and provides a third force opposite to the first force direction to the piston, when the piston 2 moves rightward (in an orientation in fig. 1), the position compensating spring 10, when the rightward movement stroke of the piston 2 exceeds the compensation amount of the position compensating spring 10, the automatic pressure relief channel is opened, so that the automatic pressure relief of the equipment can be realized, and the valve core 8 is realized.
The core component of the switch trigger 4 is a trigger rod 41, the trigger rod 41 is guided and assembled on the supporting portion 12 of the housing 1, specifically, the trigger rod 41 is guided and matched with the sealing end of the supporting portion 12 through a linear bearing 42, one end of the trigger rod receives the motion of the piston 2, a first spring seat 43 is arranged at the end, the first spring seat 43 is fixedly connected with the trigger rod 41 through thread matching and is in abutting fit with the piston 2, a second spring seat 44 is further arranged in the supporting portion 12, and the second spring seat 44 is located on the inner side of the sealing end of the supporting portion 12 and is in clearance fit with the trigger rod 41 through an inner hole. In order to ensure sealing of the mating portion of the trigger lever 41 with the support portion 12, a trigger lever shaft seal 45 is provided at the mating portion of the trigger lever 41 with the support portion. The outer end (the end far away from the piston) of the trigger rod 41 is fixedly provided with a plate seat 47 through a lock nut 46 and a corresponding step, the plate seat 47 is provided with a plurality of ejector rods 48, the ejector rods 48 are used for jacking or releasing a switch to switch the state of the switch, in the embodiment, the ejector rods 48 are in threaded fit with the plate seat 47, and therefore the effective length of the switch can be adjusted as required. In addition, in order to ensure the reliability of the movement of the plate holder 47, a guide rod 49 is provided on the housing for guiding engagement with the plate holder 47.
The return spring 5 is seated between the first spring seat 43 and the second spring seat 44, and provides the piston 2 with a second force in a direction opposite to the first force for urging the piston 2 to return.
When the high-oil-pressure equipment protection device is used, the high-pressure oil input port can be connected with high-pressure oil of equipment, and the pressure relief port is connected with an oil tank. When the pressure of the equipment needs to be manually released, as shown in fig. 3, the manual pressure release operating rod 71 is released, the valve ball 73 releases the sealing of the manual pressure release channel, and therefore manual pressure release is achieved, and the equipment is protected.
In a normal pressure boosting state of the equipment, as shown in fig. 4, along with the rise of pressure, the piston 2 compresses the return spring 5 and moves rightwards, at the moment, the valve core 8 extends out of the piston 2 under the action of the position supplementing spring 10, when the oil pressure is not higher than a maximum allowable value, the valve core 8 always keeps a closing state of the automatic pressure relief channel, and if the oil pressure is higher than the maximum allowable value, as shown in fig. 5, the moving amount of the piston 2 is increased, and the valve core 8 releases the closing of the automatic pressure relief channel, so that automatic pressure relief is realized.
In addition, during the operation of the equipment, along with the change of the oil pressure, the position of the switch trigger piece 4 is changed, the on/off of the switch under the required pressure is realized, and therefore, an automatic control or monitoring signal is provided for a control circuit. During the operation of the equipment, the normal phenomenon that the oil pressure is instantaneously reduced may occur, for example, when the operating mechanism outputs power, the pressure in a high-pressure oil cavity of the operating mechanism is instantaneously and suddenly reduced, and then is quickly recovered, which is a normal phenomenon per se. In practical engineering, it is necessary to avoid false alarm of this phenomenon by the protection device, for which the protection device is implemented as follows: when pressure needs to be released, the upstream pressure of the one-way valve 6 is larger than the downstream pressure, the valve closing spring 63 is compressed, the one-way valve core 62 is normally opened, the oil path is normal, and when oil in the oil path does not circulate, the lower end of the one-way valve core 62 is provided with a damping hole 67 (a small hole with phi of 0.3mm in the embodiment), so that the one-way valve core 62 can be closed under the pushing of the valve closing spring 64 through small-flow hydraulic oil. Because the aperture of the damping hole is small, when a transient large pressure drop occurs in the equipment, the pressure in the protection device cannot suddenly change along with the sudden change of the internal pressure of the high-voltage equipment, and the pressure at two ends of the one-way valve can slowly reach balance only through the damping hole, so that the situation of unnecessary transient error signals caused by sensitive action of a pressure switch is prevented.
The embodiment of the hydraulic operating mechanism comprises:
the hydraulic operating mechanism comprises a high-pressure oil cavity and a high-pressure oil pipe, wherein the high-pressure oil cavity and/or the high-pressure oil pipe are/is connected with a high-oil pressure equipment protection device, and the protection device is the protection device in the embodiment.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. High oil pressure equipment protection device, its characterized in that includes:
the high-pressure oil inlet is formed in the shell;
the piston is arranged in the shell, the high-pressure oil inlet is positioned at one end of the piston, and oil entering from the high-pressure oil inlet can apply a first force to the piston;
a return spring for applying a second force to the piston opposite to the first force for urging the piston to return;
a switch fixed on the housing, wherein the on/off state of the switch corresponds to a normal state and an abnormal state of the oil pressure of the high oil pressure equipment, or the on/off state of the switch corresponds to an abnormal state and a normal state of the oil pressure of the high oil pressure equipment;
and the switch trigger piece is movably arranged on the shell and used for switching the on-off state of the switch under the action of the piston and the return spring.
2. The protection device for the high oil pressure equipment according to claim 1, wherein an automatic pressure relief channel and a valve core for controlling the on-off of the pressure relief channel are further arranged in the housing, the automatic pressure relief channel is provided with an automatic pressure relief inlet, the automatic pressure relief inlet is sealed by the valve core, the valve core is movably assembled on the piston, a position compensating spring is arranged between the valve core and the piston, the position compensating spring provides a third force with the same direction as the second force to the valve core, when the piston moves under the first thrust, the valve core keeps sealing the automatic pressure relief inlet under the action of the third force, and after the piston moves under the first thrust for a set stroke, the valve core leaves the automatic pressure relief inlet.
3. The high oil pressure equipment protection device of claim 2, wherein the piston has a spool chamber therein, the spool is mounted in the spool chamber, and the spool has a pressure balance passage communicating between the inside and the outside of the spool chamber.
4. The high oil pressure equipment protection device of claim 3, wherein the reseating spring is a compression spring disposed in the spool chamber.
5. The high oil pressure equipment protector according to claim 1, characterized in that a check valve is further provided on the high pressure oil inlet of the housing or between the high pressure oil inlet and the piston, and a spool of the check valve is provided with a spring and a damping hole.
6. The high pressure oil equipment protecting device according to claim 5, wherein the spool of the check valve is linearly guided and fitted in the valve body thereof, and has a transverse passage crossing the moving direction and a longitudinal passage in the same direction as the moving direction, a passage is provided between at least one end of the transverse passage and the inner wall of the valve body of the check valve, and the orifice is provided at the front end of the spool of the check valve and communicates with the transverse passage.
7. The high oil pressure equipment protection device according to claim 1, wherein a manual pressure relief passage is further provided in the housing, and the manual pressure relief passage is provided with a manual pressure relief operation lever for opening and shutting off the manual pressure relief passage.
8. A high oil pressure equipment protection device according to claim 1, characterized in that the switch activating member is provided with a plunger for engagement with the switch, said plunger being adjustable in axial position to accommodate indications of different oil pressure thresholds.
9. A high oil pressure equipment protection device according to claim 1, wherein the switch activating member comprises a main rod in guiding engagement with the housing, the main rod being in abutting engagement with the piston, and a return spring being provided between the main rod and the housing.
10. Hydraulic operating mechanism comprising a high pressure oil chamber and a high pressure oil line, characterized in that the high pressure oil chamber and/or the high pressure oil line is/are connected with a high oil pressure equipment protection device according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010628491.XA CN111894948B (en) | 2020-07-02 | 2020-07-02 | High oil pressure equipment protection device and hydraulic pressure operating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010628491.XA CN111894948B (en) | 2020-07-02 | 2020-07-02 | High oil pressure equipment protection device and hydraulic pressure operating mechanism |
Publications (2)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757099A (en) * | 2021-09-07 | 2021-12-07 | 江苏汇智高端工程机械创新中心有限公司 | Control valve for electric control plunger pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201369292Y (en) * | 2009-01-22 | 2009-12-23 | 河南平高电气股份有限公司 | Mechanical oil pressure switch |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201369292Y (en) * | 2009-01-22 | 2009-12-23 | 河南平高电气股份有限公司 | Mechanical oil pressure switch |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757099A (en) * | 2021-09-07 | 2021-12-07 | 江苏汇智高端工程机械创新中心有限公司 | Control valve for electric control plunger pump |
| CN113757099B (en) * | 2021-09-07 | 2023-09-26 | 江苏汇智高端工程机械创新中心有限公司 | Control valve for electric control plunger pump |
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| CN111894948B (en) | 2022-08-19 |
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