CN108506560B - Priority valve and pilot valve thereof - Google Patents
Priority valve and pilot valve thereof Download PDFInfo
- Publication number
- CN108506560B CN108506560B CN201810698706.8A CN201810698706A CN108506560B CN 108506560 B CN108506560 B CN 108506560B CN 201810698706 A CN201810698706 A CN 201810698706A CN 108506560 B CN108506560 B CN 108506560B
- Authority
- CN
- China
- Prior art keywords
- pilot
- pilot valve
- valve body
- control
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/38—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side
- F16K31/383—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side the fluid acting on a piston
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention discloses a priority valve and a pilot valve thereof, wherein a pilot valve body of the pilot valve is provided with a pilot control oil flow passage and a control oil port communicating oil duct, and the inner wall of the pilot valve body is provided with a diversion trench; the pilot valve core is rotatably arranged in the pilot valve body, a sealed pilot control cavity is formed between the pilot valve core and the pilot valve body, and the pilot control cavity is communicated with the pilot control oil flow channel; the pilot control rotary impeller is positioned in the pilot control cavity; the pilot valve core is provided with a control input oil duct and a control output oil duct, the first end of the input oil duct is communicated with the control oil port communicating oil duct, the second end of the input oil duct can be communicated with the first end of the output oil duct through the diversion trench, and the second end of the output oil duct is used for being communicated with the priority valve main-level valve; the reset piece is positioned between the pilot valve body and the valve core; the pilot valve core can be free from the restriction of reverse taper, the structural design can be more flexible and changeable, and the overall axial size of the pilot valve can be shortened.
Description
Technical Field
The invention relates to the technical field of priority valves, in particular to a pilot valve and a priority valve with the pilot valve.
Background
Existing track type excavators swing priority valves are based on a pilot drive mechanism in the form of a spool valve. As shown in fig. 1, the priority valve for a crawler excavator swing includes a priority valve main stage valve group and a priority valve pilot valve group. The primary valve of the priority valve comprises a main spring 01, a main valve core 02, a main valve sleeve 03 and a limit screw plug 08. The pilot valve of the priority valve includes a pilot spring seat 04, a pilot spool 05, a pilot spring 06, and a fastening screw 07. After the pilot control oil port 010 is filled with oil, the pilot valve core 05 moves rightwards, the control oil port 09 is communicated with the control oil port 011, and oil in the pilot spring cavity is forced to be discharged, so that pressure is built at two ends of a main valve sleeve 03 of a main valve of the priority valve, and a certain valve port opening degree is guaranteed.
The structure characteristics of the pilot valve of the prior art priority valve determine that the prior art priority valve has the following problems that the axial action of the pilot valve core 05 can be blocked due to the reverse taper, that is, the pilot valve core 05 can only adopt the cylindrical mechanism shown in fig. 1, but can not adopt other structures, such as a taper, so that the prior art priority valve has certain limitation, and the axial action pilot mechanism can have a longer axial dimension, so that the axial dimension of the pilot valve of the prior art priority valve is larger.
Therefore, how to optimize the pilot valve structure, avoid the influence of the reverse taper on the action of the pilot valve core, and reduce the axial size thereof is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a pilot valve, so as to avoid the influence of the reverse taper on the action of the pilot valve core and reduce the axial size of the pilot valve. Further, another object of the present invention is to provide a priority valve having the above pilot valve.
In order to achieve the purpose, the invention provides the following technical scheme:
a pilot valve for driving a primary valve of a priority valve, comprising:
the pilot valve body is provided with a pilot control oil flow passage and a control oil port communicating oil duct, and the inner wall of the pilot valve body is provided with a diversion trench;
the pilot valve core is rotatably arranged in the pilot valve body, a sealed pilot control cavity is formed between the pilot valve core and the pilot valve body, and the pilot control cavity is communicated with the pilot control oil flow passage; a pilot control rotary impeller which is circumferentially arranged on the outer wall of the pilot valve core is positioned in the pilot control cavity; the pilot valve core is provided with a control input oil duct and a control output oil duct, a first end of the control input oil duct is communicated with the control oil port communicating oil duct, a second end of the control input oil duct is communicated with a first end of the control output oil duct through the diversion trench when the pilot valve core rotates for a preset angle, and a second end of the control output oil duct is used for being communicated with the priority valve main stage valve;
and the resetting piece is arranged between the pilot valve body and the pilot valve core.
Preferably, a flow area between the diversion trench and the second end of the control input oil passage and the first end of the control output oil passage increases or decreases with rotation of the pilot valve spool.
Preferably, the diversion trench is a trapezoidal trench, and the large end of the trapezoidal trench is located in front of the trapezoidal trench in the rotation direction of the pilot valve core.
Preferably, the control input oil passage and the control output oil passage are respectively formed with a kidney-shaped opening on the outer wall of the pilot valve core for communicating with the diversion trench.
Preferably, an oil release cavity is formed between the pilot valve core and the pilot valve body, the oil release cavity is communicated with the control input oil duct, and the oil release cavity is communicated with the outside through an oil release port arranged on the outer wall of the pilot valve body.
Preferably, a balance rotary impeller is arranged on the outer wall of the pilot valve core along the circumferential direction, and the balance rotary impeller is located in the oil drainage cavity.
Preferably, the reset member is a torsion spring, the torsion spring is sleeved outside the balance rotary impeller, one end of the torsion spring is connected with the pilot valve core, and the other end of the torsion spring is connected with the pilot valve body.
Preferably, one of the pilot valve core and the pilot valve seat is provided with a limiting piece, and the other is provided with a fitting piece, and the limiting piece is matched with the fitting piece to limit the rotation angle of the pilot valve core.
Preferably, the locating part is a protrusion, the fitting part is a sliding groove, the protrusion is along when the sliding groove slides to a first limit position, the flow area between the control input oil passage and the control output oil passage and the flow guide groove is 0, and when the sliding groove slides to a second limit position, the flow area between the control input oil passage and the control output oil passage and the flow guide groove is the largest.
Preferably, a slewing auxiliary bearing is arranged between the pilot valve spool and the pilot valve body.
A priority valve comprising:
a priority valve body;
a main stage valve disposed in the priority valve body;
the pilot valve according to any one of the above aspects, wherein the pilot valve body is connected to the priority valve body, and the second end of the control output oil passage is communicated with the inlet of the main valve, and is configured to drive the valve element of the main valve to move.
Preferably, the pilot valve body is threadedly engaged with the priority valve body.
Preferably, pilot valve's one end is formed with the cylindric installation department, be provided with the internal thread on the inner wall of cylindric installation department, be provided with annular mounting groove on the priority valve body, be provided with the external screw thread on the inner circle wall of annular mounting groove, the cylindric installation department inserts in the annular mounting groove and through the internal thread with the cooperation of external screw thread makes pilot valve with priority valve body spiro union.
Preferably, one end of the control oil port communication oil duct, which is far away from the control output oil duct, is communicated with the main oil duct on the priority valve body through the communication oil duct on the priority valve body.
Preferably, the pilot valve further comprises a pre-tightening spring, the pre-tightening spring is arranged between the pilot valve core and a main valve body of the main valve, and the pre-tightening spring provides pre-tightening force to push the pilot valve core tightly.
According to the technical scheme, the pilot valve disclosed by the invention is used for driving the main-stage valve of the priority valve to act and comprises a pilot valve body, a pilot valve core and a reset piece, wherein the pilot valve body is provided with a pilot control oil flow passage and a control oil port communicating oil passage, and the inner wall of the pilot valve body is provided with a flow guide groove; the pilot valve core is rotatably arranged in the pilot valve body, a sealed pilot control cavity is formed between the pilot valve core and the pilot valve body, and the pilot control cavity is communicated with the pilot control oil flow channel; the pilot control rotary impeller which is circumferentially arranged on the outer wall of the pilot valve core is positioned in the pilot control cavity; the pilot valve core is provided with a control input oil duct and a control output oil duct, the first end of the control input oil duct is communicated with the control oil port communicating oil duct, the second end of the control input oil duct is communicated with the first end of the control output oil duct through the diversion trench when the pilot valve core rotates for a preset angle, and the second end of the control output oil duct is used for being communicated with the priority valve main-level valve; the reset piece is arranged between the pilot valve body and the pilot valve core;
when the pilot valve control oil enters the pilot control cavity through the pilot control oil flow channel, the pilot control oil acts on the pilot control rotary impeller to push the pilot valve core to rotate, when the pilot valve core rotates by a preset angle, the second end of the control input oil channel is communicated with the first end of the control output oil channel through the flow guide groove when the pilot valve core rotates by the preset angle, and the control oil of the main valve enters the control output oil channel from the control input oil channel and is output from the second end of the control output oil channel to act on the main valve of the priority valve;
therefore, the pilot valve replaces the axial movement of the pilot valve core in the traditional pilot valve by the rotation of the pilot valve core, so that the pilot valve core is not restricted by reverse taper, the structural design can be more flexible and changeable, and the whole axial size of the pilot valve can be shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art priority valve;
FIG. 2 is a schematic diagram of a priority valve provided in accordance with an embodiment of the present invention;
FIG. 3 is a front view of a pilot valve body of a pilot valve provided in an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a pilot valve body of a pilot valve according to an embodiment of the present invention;
FIG. 5 is an isometric view of a pilot valve spool of a pilot valve provided in accordance with an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a pilot valve spool of a pilot valve provided in accordance with an embodiment of the present invention;
FIG. 7 is an isometric view of a priority valve body of a priority valve provided by an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a priority valve body of a priority valve provided in accordance with an embodiment of the present invention;
FIG. 9 is a cross-sectional view of a main stage valve of the priority valve provided by an embodiment of the present invention;
FIG. 10 is an isometric view of a primary valve of the priority valve provided by an embodiment of the present invention.
In fig. 1:
01 is a main spring, 02 is a main valve core, 03 is a main valve sleeve; 04 is a pilot spring seat; 05 is a pilot valve core; 06 is a pilot spring; 07 is a fastening screw; 08 is a limit screw plug; 09. 011 is a control oil port; 010 is a pilot control oil port;
in fig. 2-9:
1 is a pilot valve body; 101 is an oil drainage port; 102 is a pilot valve control oil inlet; 103 is a pilot valve control oil outlet; 104 is a first channel; 105 is a first torsion spring catch; 106 is an oil relief cavity; 107 is a chute; 108 is a diversion trench; 109 is a pilot control cavity; 110 is a second channel; 111 is a pilot body seal groove; 112 is a through hole; 113 is a cylindrical mounting portion; 2 is a pilot valve core; 201 is a balanced rotating impeller; 202 is a projection; 203. 204 is a waist-shaped opening; 205 is a pilot-controlled rotary impeller; 206. 209 and 211 are sealing clamping grooves; 207 is a second torsion spring catch; 208 is the control input oil gallery; 210 is a control output oil passage; 3 is a priority valve body; 301 is a main oil gallery; 302 is an intermediate oil gallery; 303 is an annular mounting groove; 304 is a communicating oil passage; 305 is an intermediate cavity; 4 is a rotary auxiliary bearing; 5 is a torsion spring; 6. 7, 8, 9, 10 and 16 are sealing rings; 11 is a main-stage valve body; 1101 is a special-shaped throttling opening; 1102 is a pressure equalizing groove; 1103 is a first restriction; 1104 is a second restriction; 12 is a main stage valve core; 1201 is the fourth orifice; 1202 is a third port; 13 is a compression spring; 14 is a limit screw plug; 15 is a pre-tightening spring; and 17 is an end plug.
Detailed Description
In view of the above, the core of the present invention is to provide a pilot valve, the structural design of which can avoid the influence of the reverse taper on the action of the pilot valve core, and reduce the axial size of the pilot valve. Furthermore, another core of the present invention is to provide a priority valve having the above pilot valve.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 2 to 6, fig. 2 is a schematic structural diagram of a priority valve according to an embodiment of the present invention, fig. 3 is a front view of a pilot valve body of a pilot valve according to an embodiment of the present invention, fig. 4 is a cross-sectional view of the pilot valve body of the pilot valve according to an embodiment of the present invention, fig. 5 is an isometric view of a pilot valve spool of the pilot valve according to an embodiment of the present invention, and fig. 6 is a cross-sectional view of the pilot valve spool of the pilot valve according to an embodiment of the present invention.
The invention discloses a pilot valve, which is used for driving the action of a main-stage valve of a priority valve and comprises a pilot valve body 1, a pilot valve core 2 and a resetting piece.
The pilot valve body 1 is provided with a pilot control oil flow passage and a control oil port communicating oil passage 304, the inner wall of the pilot valve body 1 is provided with a guide groove 108, the guide groove 108 does not penetrate through the side wall of the pilot valve body 1, and the opening depth of the guide groove 108 is smaller than the thickness of the side wall of the pilot valve body 1; the pilot valve core 2 is rotatably arranged in the pilot valve body 1, where the rotatable pilot valve core 2 can rotate around its own axis, but not around other axes, that is, the pilot valve core 2 and the pilot valve body 1 still need to be coaxially arranged, a sealed pilot control cavity 109 is formed between the pilot valve core 2 and the pilot valve body 1, the pilot control cavity 109 is communicated with a pilot control oil flow channel, as shown in the figure, a pilot valve control oil inlet 102 and a pilot valve control oil outlet 103 are arranged on the pilot valve body to introduce pilot control oil; a pilot control rotary impeller 205 is circumferentially arranged on the outer wall of the pilot valve core 2, the pilot control rotary impeller 205 is positioned in the pilot control cavity 109, and when pilot control oil is introduced into the pilot control cavity 109, the pilot control oil can push the pilot control rotary impeller 205 to drive the whole pilot valve core 2 to rotate; the pilot valve core 2 is provided with a control input oil channel 208 and a control output oil channel 210, a first end of the control input oil channel 208 is communicated with a control oil port communication oil channel 304, a second end of the control input oil channel 208 is communicated with a first end of the control output oil channel 210 through a guide groove 108 when the pilot valve core 2 rotates by a preset angle, and the preset angle is determined by initial positions of the pilot valve core 2 and the pilot valve body 1, so that a person skilled in the art can design to control the preset angle as required during manufacturing, wherein the preset angle is more than or equal to 0 degrees and less than 360 degrees, and the second end of the control output oil channel 210 is used for being communicated with a priority valve main-stage valve; the reset piece is arranged between the pilot valve body 1 and the pilot valve core 2, and the reset key is used for enabling the pilot valve core 2 to reversely rotate to return to the initial position.
Compared with the prior art, in the pilot valve provided by the invention, when the pilot valve is applied, the pilot valve control oil enters the pilot control cavity 109 through the pilot control oil flow passage, the pilot valve control oil acts on the pilot control rotary impeller 205 to push the pilot valve spool 2 to rotate, when the pilot valve spool 2 rotates by a preset angle, the second end of the control input oil channel 208 is communicated with the first end of the control output oil channel 210 through the diversion groove 108 when the pilot valve spool 2 rotates by the preset angle, and the main valve control oil enters the control output oil channel 210 from the control input oil channel 208 and is output from the second end of the control output oil channel 210 to act on the priority valve main valve.
As shown in fig. 2, the above-described seal of the pilot control chamber 109 is completed by the seal rings 8 and 7 located on both sides of the pilot control chamber 109, and both the seal rings 8 and 7 are located between the pilot valve body 1 and the pilot valve body 2.
As shown in fig. 1, in the conventional pilot valve with an axially moving valve element, the flow area between the control oil port 09 and the control oil port 011 is adjusted by moving the pilot valve element 205 left and right, so as to play a role of throttling, in the embodiment of the present invention, the flow area between the flow guide groove 108 and the second end of the control input oil channel 208 and the first end of the control output oil channel 210 is increased or decreased with the rotation of the pilot valve element 2 by adjusting the shape of the opening formed on the outer wall of the pilot valve element 2 by adjusting the flow guide groove 108 and/or the second end of the control input oil channel 208 and the first end of the control output oil channel 210, so as to realize the control of the flow area between the control input oil channel 208 and the control output oil channel 210, and realize the throttling of the main stage valve control oil flowing therebetween.
As shown in fig. 4, in the embodiment of the present invention, the guide groove 108 is a trapezoidal groove, the large end of which is located in front of the trapezoidal groove in the rotation direction of the pilot poppet 2, in the use process, when the pilot valve core 2 is at the initial position, the control input oil channel 208 and the control output oil channel 210 are not communicated with the diversion trench 108, when the pilot valve spool 2 rotates by a preset angle, the second end of the control input oil channel 208 and the first end of the control output oil channel 210 are firstly communicated with the small end of the diversion trench 108, at this time, the second end of the control input oil channel 208 and the first end of the control output oil channel 210 are communicated with the diversion trench 108, the flow area is small, along with the rotation of the pilot valve spool 2, the second end of the control input oil channel 208 and the first end of the control output oil channel 210 move to the large end of the diversion trench 108, and the flow area between the second end of the control input oil channel 208 and the first end of the control output oil channel 210 and the diversion trench 108 gradually increases.
It is to be understood that the trapezoidal groove described above is merely a preferred embodiment provided by the present invention, and the shape of the actual guide groove 108 is not limited thereto, and the guide groove 108 may be a circular groove, a square groove, an elliptical groove, a triangular groove, or the like, without limitation, by synchronizing the opening of the second end of the control input oil passage 208 and the first end of the control output oil passage 210 on the outer wall of the pilot spool 2.
Further optimizing the above technical solution, in the embodiment of the present invention, the control input oil passage 208 and the control output oil passage 210 are respectively formed with kidney-shaped openings 203 and 204 on the outer wall of the pilot valve spool 2 for communicating with the guide groove 108, and the length directions of the kidney-shaped openings 203 and 204 are parallel to the axial direction of the pilot valve spool 2, as shown in fig. 5.
Referring to fig. 6, the control input oil passage 208 and the control output oil passage 210 are both L-shaped oil passages, and include a main body portion formed along the axial direction of the pilot valve core 2 and a branch portion formed on the side wall of the pilot valve core 2, in the embodiment of the present invention, the branch portion intersects with the main body portion but is not perpendicular to the axial direction of the pilot valve core 2, that is, the ends of the branch portion of the control input oil passage 208 and the branch portion of the control output oil passage 210 far from the main body portions are close to each other, so as to form a V-shaped flow passage when communicating with the flow guide groove 108.
Further, in order to ensure stable control of the main stage valve of the priority valve even if the flow rate of the control oil output in the control output oil passage 210 is stable, in the embodiment of the invention, the bores of the main body portion and the bypass portion of the control input oil passage 208 are larger than the bores of the main body portion and the bypass portion of the control output oil passage 210, respectively.
When the pilot valve is fed with the pilot valve control oil, part of the pilot valve control oil inevitably enters a gap between the pilot valve body 1 and the pilot valve core 2, in order to avoid the adverse effect of the oil pressure of the pilot valve control oil on the rotation of the pilot valve core 2, in the embodiment of the invention, a drain cavity 106 is formed between the pilot valve core 2 and the pilot valve body 1, the drain cavity 106 is communicated with the control input oil duct 208, the drain cavity 106 is communicated with the outside through a drain port 101 formed in the outer wall of the pilot valve body 1, and the redundant pilot valve control oil can be discharged by arranging the drain cavity 106, so that the pilot valve core 2 can be ensured to rotate in time, and the response speed is improved.
As shown in fig. 5, in the embodiment of the present invention, a balancing rotary impeller 201 is circumferentially disposed on an outer wall of the pilot valve core 2, and the balancing rotary impeller 201 is located in the oil drain chamber 106.
Specifically, as shown in fig. 2 and fig. 5, the pilot-controlled rotary impeller 205 is close to one end of the pilot valve core 2, and when the pilot-controlled rotary impeller 205 is pushed by hydraulic oil, one end of the pilot valve core 2 is stressed, which easily causes radial swing of the other end, and affects balance when the pilot valve core 2 rotates, for this reason, in the embodiment of the present invention, the above-mentioned balance rotary impeller 201 is disposed at one end of the pilot valve core 2 away from the pilot-controlled rotary impeller 205, so as to stress two ends of the pilot valve core 2 at the same time, ensure balance of rotation, and improve stability of the pilot valve core 2.
In the present invention, the pilot valve core 2 and the pilot valve body 1 rotate relatively, so the reset member is a structure that generates elastic potential energy in the twisting process, for example, as shown in fig. 2, the reset member is a twisting spring 5, the twisting spring 5 is sleeved outside the balance rotary impeller 201, one end of the twisting spring 5 is connected to the pilot valve core 2, and the other end is connected to the pilot valve body 1, when in use, the twisting spring 5 gradually tightens in the radial direction along with the rotation of the pilot valve core 2 to generate elastic potential energy, and when the force applied to the pilot control rotary impeller 205 by the pilot valve control oil is removed, the twisting spring 5 radially expands to release the elastic potential energy, so that the pilot valve core 2 returns to the initial position.
Further optimize above-mentioned technical scheme, for avoiding leading case 2 to rotate the excessive, influence the normal work of pilot valve, can set up the locating part on leading case 2 and one in the pilot valve seat, set up the fitting piece on another, locating part and fitting piece cooperation are in order to restrict the turned angle of leading case 2.
Specifically, in the embodiment of the present invention, as shown in fig. 4 and 5, the limiting member is a protrusion 202, the mating member is the sliding slot 107, when the protrusion 202 slides along the sliding slot 107 to the first limiting position, the flow areas between the control input oil passage 208 and the control output oil passage 210 and the guide groove 108 are 0, and when the protrusion 202 slides along the slide groove 107 to the second limit position, the flow areas between the control input oil gallery 208 and the control output oil gallery 210 and the flow guide groove 108 are maximized, which, by virtue of the above-described structure, in the initial state, so that the pilot spool 2 can be in the first limit position by the reset member, the control input oil passage 208 and the control output oil passage 210 are not communicated with the pilot groove 108, when the pilot valve control oil is introduced, the oil pressure of the pilot valve control oil overcomes the reset piece to drive the pilot valve core 2 to rotate, when the pilot spool 2 rotates to the second limit position, the flow areas between the control input oil passage 208 and the control output oil passage 210 and the guide groove 108 reach the maximum value.
The protrusion 202 and the sliding groove 107 form a two-way limit for the pilot valve element 2, in other embodiments, the structure of the limiting member and the matching member may also be adjusted to realize a one-way limit for the pilot valve element 2, for example, the limiting member is a limiting pin telescopically arranged on one of the pilot valve element 2 and the pilot valve body 1 under the control of an elastic member, the matching member is a guiding limiting groove arranged on the other one of the pilot valve element 2 and the pilot valve body 1, the guiding limiting groove is tangentially arranged on the outer wall of the pilot valve element 2 or the inner wall of the pilot valve body 1, when the pilot valve control oil pushes the pilot valve element 2 to rotate, the limiting pin enters from the first end of the guiding limiting groove and gradually extends out until the limiting pin collides with the second end of the limiting groove to be matched for limiting; when the reset piece pushes the pilot valve core 2 to reset, the limiting pin gradually retracts under the pushing of the guide limiting groove until the limiting pin exits from the guide limiting groove.
Further optimizing the technical scheme, in the embodiment of the invention, a slewing auxiliary bearing 4 is arranged between the pilot valve core 2 and the pilot valve body 1, the inner ring of the slewing auxiliary bearing 4 is matched with the pilot valve core 2, and the outer ring is matched with the pilot valve body 1.
In addition, the application also discloses a priority valve, including priority valve body 3, pilot valve and primary valve, main oil gallery 301 has been seted up on priority valve body 3, the flow of oil that this main oil gallery 301 flows through is controlled to the primary valve, this main oil gallery 301 is as the runner of the parallel channel on the multiple unit valve, this primary valve sets up in priority valve body 3, the pilot valve is as the above-mentioned pilot valve of embodiment, this pilot valve is connected in priority valve body 3, and the second end of the control output oil gallery 210 on the pilot valve core 2 of this pilot valve communicates with the entry of primary valve, be used for driving the case action of primary valve, because foretell pilot valve has foretell technological effect, consequently, the priority valve that has this pilot valve also has above-mentioned all technological effects, no longer describe herein one by one.
In the conventional priority valve, the valve body of the pilot valve is usually connected with the valve body of the priority valve through a bolt, and the position of a bolt hole is easy to interfere with a flow channel in the pilot valve or the priority valve, so that the casting difficulty of the valve body is increased, and therefore, in the embodiment of the invention, the pilot valve body 1 is in threaded connection with the priority valve body 3.
Referring to fig. 4, 7 and 8, a cylindrical mounting portion 113 is formed at one end of the pilot valve body 1, an internal thread is formed on an inner wall of the cylindrical mounting portion 113, an annular mounting groove 303 is formed on the priority valve body 3, an external thread is formed on an inner ring wall surface of the annular mounting groove 303, and the cylindrical mounting portion 113 is inserted into the annular mounting groove 303 and enables the pilot valve body 1 to be screwed with the priority valve body 3 through the matching of the internal thread and the external thread.
A seal ring 9 is provided between the pilot valve body 1 and the priority valve body 33 to prevent oil leakage from a gap between the outer wall of the cylindrical mounting portion 113 and the outer ring wall surface of the annular mounting groove 303 in the priority valve body 3.
As shown in fig. 4, in the embodiment of the present invention, since the cylindrical mounting portion 113 is long in length, the through-hole 112 is also opened in the radial direction to avoid blocking the main oil gallery 301 of the priority valve body 3.
The main stage valve is disposed in the middle cavity 305 in the middle of the annular mounting groove 303, and a pressure equalizing groove 1102 is disposed on an outer wall of the main stage valve body 11 of the main stage valve, so as to ensure that the main stage valve element 12 does not get stuck due to a structural defect of the main stage valve element 12 itself when moving axially, as shown in fig. 9, in the embodiment of the present invention, the pressure equalizing groove 1102 includes a plurality of annular grooves axially spaced along the main stage valve body 11.
Referring to fig. 9 and 10, the main-stage valve body 11 is further provided with a special-shaped orifice 1101, a first orifice 1103 and a second orifice 1104, wherein the special-shaped orifice 1101 is used for communicating oil in an inner hole of the main-stage valve spool 12 with oil at the left end of the limit screw plug 14; the first choke 1103 is used for communicating with the oil in the middle oil passage 302 of the priority valve body 3 passing through the main stage spool 12; the second throttling port 1104 is used for introducing oil in the middle flow passage 302 on the priority valve body 3 of the valve into the action surface at the upper right end of the main valve body 11 to push the main valve body 11 to be opened so as to start the function of the priority valve; the main-stage valve element 12 is provided with a third orifice 1202, after the main-stage valve element 12 is opened, oil flows to the small-diameter cavity of the main-stage valve body 11 through the third orifice 1202, and oil pressure is established at the action surface of the left end of the small-diameter cavity of the main-stage valve body 11.
In order to further optimize the technical scheme and reduce the number of pipelines of the priority valve, and facilitate piping and arrangement, in the embodiment of the present invention, one end of the control oil port communication oil passage 304, which is far away from the control output oil passage 210, is communicated with the main oil passage 301 on the priority valve body 3 through the communication oil passage 304 on the priority valve body 3.
Specifically, as shown in fig. 2 and 4, the control oil port communication oil passage 304 includes a first passage, a second passage, and a third passage for communicating the first passage and the second passage, the first passage 104 is coaxial with the pilot valve body 1, the second passage 110 is formed in parallel with the first passage 104, the first passage 104 is communicated with an inner cavity of the pilot valve body 1, and the second passage 107 is communicated with the main oil passage 301 with the communication oil passage 304 on the priority valve body 33.
In order to avoid axial float of the pilot valve core 2 in the use process, in the embodiment of the invention, the priority valve further comprises a pre-tightening spring 15, the pre-tightening spring 15 is arranged between the pilot valve core 2 and the main valve body 11 of the main valve, the pre-tightening spring 15 provides pre-tightening force to push the pilot valve core 2 tightly, when the pilot valve body 1 is arranged on the priority valve body 33, the pilot valve core 2 compresses the pre-tightening spring 15, and the compression spring pushes the pilot valve core 2 tightly to realize axial limit on the pilot valve core 2.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A pilot valve for actuating a primary valve of a priority valve, comprising:
the pilot valve body is provided with a pilot control oil flow passage and a control oil port communicating oil duct, and the inner wall of the pilot valve body is provided with a diversion trench;
the pilot valve core is rotatably arranged in the pilot valve body, a sealed pilot control cavity is formed between the pilot valve core and the pilot valve body, and the pilot control cavity is communicated with the pilot control oil flow passage; a pilot control rotary impeller which is circumferentially arranged on the outer wall of the pilot valve core is positioned in the pilot control cavity; a control input oil duct and a control output oil duct are arranged on the pilot valve core, a first end of the control input oil duct is communicated with the control oil port communicating oil duct, a second end of the control input oil duct is communicated with a first end of the control output oil duct through the diversion trench when the pilot valve core rotates for a preset angle, the second end of the control output oil duct is used for being communicated with the priority valve main-stage valve, an oil drainage cavity is formed between the pilot valve core and the pilot valve body, the oil drainage cavity is communicated with the control input oil duct, and the oil drainage cavity is communicated with the outside through an oil drainage port formed in the outer wall of the pilot valve body;
and the resetting piece is arranged between the pilot valve body and the pilot valve core.
2. The pilot valve of claim 1 wherein a flow area between the pilot groove and the second end of the control input gallery and the first end of the control output gallery increases or decreases with rotation of the pilot spool.
3. A pilot valve as claimed in claim 2, wherein the pilot flow groove is a trapezoidal groove, and a large end of the trapezoidal groove is located in front of the trapezoidal groove in a rotation direction of the pilot spool.
4. The pilot valve according to claim 2 or 3, wherein the control input oil passage and the control output oil passage are formed with kidney-shaped openings for communication with the pilot groove, respectively, on an outer wall of the pilot spool.
5. The pilot valve as claimed in claim 1, wherein a balance rotary impeller is circumferentially arranged on an outer wall of the pilot valve core, and the balance rotary impeller is located in the oil drainage cavity.
6. The pilot valve as claimed in claim 5, wherein the reset member is a torsion spring, the torsion spring is sleeved outside the balance rotary impeller, one end of the torsion spring is connected to the pilot valve core, and the other end of the torsion spring is connected to the pilot valve body.
7. A pilot valve as claimed in any one of claims 1 to 3 and 5 to 6, wherein one of the pilot valve spool and the pilot valve body is provided with a limiting member, and the other is provided with a cooperating member, and the limiting member cooperates with the cooperating member to limit the rotation angle of the pilot valve spool.
8. The pilot valve of claim 7, wherein the limiting member is a protrusion, the cooperating member is a sliding slot, the flow area between the control input oil passage and the control output oil passage and the guiding slot is 0 when the protrusion slides along the sliding slot to a first limit position, and the flow area between the control input oil passage and the control output oil passage and the guiding slot is the largest when the protrusion slides along the sliding slot to a second limit position.
9. A pilot valve as claimed in any one of claims 1 to 3, 5 to 6 and 8, wherein a slew assist bearing is provided between the pilot spool and the pilot valve body.
10. A priority valve, comprising:
a priority valve body;
a main stage valve disposed in the priority valve body;
a pilot valve as claimed in any one of claims 1 to 9, wherein the pilot valve body is connected to the priority valve body, and the second end of the control output oil passage is in communication with the inlet of the main stage valve for driving the valve spool of the main stage valve to move.
11. The priority valve as recited in claim 10 wherein the pilot valve body is threadably engaged with the priority valve body.
12. The priority valve according to claim 11, wherein a cylindrical mounting portion is formed at one end of the pilot valve body, an internal thread is provided on an inner wall of the cylindrical mounting portion, an annular mounting groove is provided on the priority valve body, an external thread is provided on an inner ring wall surface of the annular mounting groove, and the cylindrical mounting portion is inserted into the annular mounting groove and causes the pilot valve body to be screwed with the priority valve body by cooperation of the internal thread and the external thread.
13. The priority valve according to any one of claims 10 to 12, wherein an end of the control port communication oil passage remote from the control output oil passage communicates with a main oil passage on the priority valve body through a communication oil passage on the priority valve body.
14. The priority valve of any of claims 10-12, further comprising a pre-load spring disposed between the pilot spool and the main stage valve body of the main stage valve, the pre-load spring providing a pre-load force against the pilot spool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698706.8A CN108506560B (en) | 2018-06-29 | 2018-06-29 | Priority valve and pilot valve thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698706.8A CN108506560B (en) | 2018-06-29 | 2018-06-29 | Priority valve and pilot valve thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108506560A CN108506560A (en) | 2018-09-07 |
| CN108506560B true CN108506560B (en) | 2020-04-03 |
Family
ID=63403999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810698706.8A Active CN108506560B (en) | 2018-06-29 | 2018-06-29 | Priority valve and pilot valve thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108506560B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411647B (en) * | 2020-12-02 | 2024-03-12 | 龙工（上海）精工液压有限公司 | Swing arm-to-rotation priority control system and priority valve for hydraulic excavator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2044026U (en) * | 1988-11-30 | 1989-09-06 | 潘金荣 | Closed plunger valve |
| CN2048147U (en) * | 1989-03-09 | 1989-11-22 | 林纪仁 | Aerodynamic v-type regulating notched ball valve |
| CN104180055A (en) * | 2014-08-19 | 2014-12-03 | 郑子叶 | Pilot control gate valve |
| CN104930196A (en) * | 2015-04-18 | 2015-09-23 | 张新丰 | Pilot-operated type stop device |
| CN204985746U (en) * | 2015-08-27 | 2016-01-20 | 济南大学 | Right -angle type pneumatic valve based on guide's structure |
-
2018
- 2018-06-29 CN CN201810698706.8A patent/CN108506560B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2044026U (en) * | 1988-11-30 | 1989-09-06 | 潘金荣 | Closed plunger valve |
| CN2048147U (en) * | 1989-03-09 | 1989-11-22 | 林纪仁 | Aerodynamic v-type regulating notched ball valve |
| CN104180055A (en) * | 2014-08-19 | 2014-12-03 | 郑子叶 | Pilot control gate valve |
| CN104930196A (en) * | 2015-04-18 | 2015-09-23 | 张新丰 | Pilot-operated type stop device |
| CN204985746U (en) * | 2015-08-27 | 2016-01-20 | 济南大学 | Right -angle type pneumatic valve based on guide's structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108506560A (en) | 2018-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5873561A (en) | Two-port cartridge seat valve | |
| CN203570734U (en) | Balance valve, hydraulic cylinder telescopic control loop and hydraulic equipment | |
| WO2021037249A1 (en) | Hydraulic control one-way valve | |
| TWI535960B (en) | Regulator valve | |
| WO2018145493A1 (en) | Hydraulic plunger pump variable control structure and control method for the same | |
| KR20120039050A (en) | Proportional poppet valve with integral check valve | |
| JP5091166B2 (en) | LUDV valve device | |
| CN105971963A (en) | Flow type balancing valve | |
| US5409040A (en) | Springless pilot operated sequence valve | |
| CN111878478A (en) | High-pressure overflow valve for main control valve of large excavator | |
| CN108506560B (en) | Priority valve and pilot valve thereof | |
| CN108278393B (en) | A kind of slide valve type guide one-way overflow valve | |
| CN108223475B (en) | Compact one-way sequence valve | |
| RU2314449C2 (en) | Controllable check valve | |
| US7686039B2 (en) | Cartridge valve assembly | |
| CN210423198U (en) | Bidirectional hydraulic lock | |
| GB2596689A (en) | Milling and whipstock assembly with flow diversion component | |
| US20190316693A1 (en) | Valve and hydraulic system with the same | |
| US2924239A (en) | Servo valve having helically arranged metering ports | |
| CN110735929A (en) | pilot-operated solenoid valve | |
| CN110529635B (en) | Valve device | |
| CN104653537B (en) | Lockable reversing valve | |
| CN220268072U (en) | Plug-in pilot type pressure-reducing steady flow valve | |
| JP3068863B2 (en) | Check valve | |
| CN108547819B (en) | Hydraulic control type bidirectional check valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261001 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261001 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |