CN111828421B - Valve core and balance valve - Google Patents
Valve core and balance valve Download PDFInfo
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- CN111828421B CN111828421B CN202010673981.1A CN202010673981A CN111828421B CN 111828421 B CN111828421 B CN 111828421B CN 202010673981 A CN202010673981 A CN 202010673981A CN 111828421 B CN111828421 B CN 111828421B
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- valve core
- valve
- drainage hole
- core body
- hole
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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
Abstract
The invention discloses a valve core and a balance valve, which comprise a valve core body, wherein a sealing groove is formed in the circumferential direction of the valve core body, and a drainage channel for unloading pressure oil at the circumference of the sealing groove is formed in the valve core body. By designing the valve core with the drainage channel, pressure oil at the circumference of the sealing groove is unloaded in the reversing process of the valve core, the friction force at the sealing position of the sealing ring is reduced, the hysteresis of the balance valve is reduced, and the balance valve is simple and compact in overall structure layout and low in cost.
Description
Technical Field
The invention relates to the technical field of valve cores, in particular to a valve core and a balance valve.
Background
In the engineering mechanical equipment widely used at present, a large number of amplitude-variable lifting and hoisting hydraulic circuits are applied, wherein a balance valve is a key core part for controlling the safe and stable operation of an amplitude-variable lifting hydraulic oil cylinder or a hoisting circuit hydraulic motor, and the performance of the balance valve directly influences the performance of a main machine. In order to ensure zero leakage and prevent heavy object from falling, a dynamic seal is required to be arranged between a valve core and a valve hole in the market, the pilot pressure hysteresis of the balance valve is increased due to friction caused by a sealing ring when the valve core works in a reversing mode, or the valve core hole and the valve core of the balance valve are poor in machining precision, and the valve is blocked when the balance valve is used in a matching mode, so that the hysteresis of the balance valve is increased, and the control performance of the whole machine is influenced.
Disclosure of Invention
The invention aims to provide a valve core and a balance valve, which can unload the pressure at the dynamic seal position of the valve core, reduce the friction force at the dynamic seal position and reduce the hysteresis loop of the balance valve.
The technical purpose of the invention is realized by the following technical scheme:
the valve core comprises a valve core body;
a sealing groove is formed in the circumferential direction of the valve core body;
and the valve core body is provided with a drainage channel for unloading the pressure oil at the circumference of the sealing groove.
Furthermore, the drainage channel comprises an on-off hole, a first drainage hole, a second drainage hole and a third drainage hole;
the second drainage hole is formed in the axial direction of the valve core body, an end cap is fixedly connected to the starting end of the second drainage hole, the tail end of the second drainage hole axially extends into the valve core body, and the first drainage hole and the third drainage hole are formed in the radial direction of the valve core body respectively and are communicated with the second drainage hole.
Furthermore, an annular flow passage communicated with the third drainage hole is formed in the circumferential direction of the valve core body.
Furthermore, the starting end of the second drainage hole is a threaded hole, and the plug is a threaded plug and is in threaded connection with the threaded hole.
Furthermore, a shoulder is further arranged on the outer periphery of the valve core body.
The invention also provides a balance valve which is characterized by comprising a balance valve body and the valve core;
a valve core hole, a flange oil port and an oil port are formed in the balance valve body, and the valve core body is movably arranged in the valve core hole of the balance valve body;
the balance valve body is connected with a power device used for the valve core body to perform reversing motion;
the balance valve body is connected with a return device for realizing reversing reset of the valve core body;
and in the reversing movement and the reversing reset process of the valve core body, the flange oil port and the oil port are communicated with the drainage channel.
Further, the power device comprises a transition block and a pilot end cover:
the transition block is connected with one end of the balance valve body, and a pilot plunger for driving the valve core body to perform reversing motion is movably arranged in a pilot control cavity of the transition block;
the pilot end cover is connected with the transition block, a pressure oil duct is formed in the pilot end cover, and the pressure oil duct is communicated with the pilot control cavity of the transition block.
Further, the area of a first annular acting surface of the valve core body, which is arranged towards the transition block, is smaller than the area of a second annular acting surface of the pilot plunger, which is arranged towards the pilot end cover.
Further, the return device comprises a valve seat and a return spring;
the valve seat is connected with the other end of the balance valve body, and an installation groove is formed in the valve seat;
one end of the reset spring is connected with or propped against the end part of the groove of the mounting groove, and the other end of the reset spring is propped against the valve core body.
Furthermore, a spring seat is connected to one end of the return spring, which abuts against the valve core body, a groove body is formed in one end of the spring seat, which deviates from the return spring, and a ball body matched with the groove body is connected to one end of the valve core body, which faces the spring seat.
The invention has the following beneficial effects:
by designing the valve core with the drainage channel, pressure oil at the circumference of the sealing groove is unloaded in the reversing process of the valve core, the friction force at the sealing position of the sealing ring is reduced, the hysteresis of the balance valve is reduced, and the balance valve is simple and compact in overall structure layout and low in cost.
Drawings
FIG. 1 is a schematic cross-sectional view of a valve cartridge in an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of a balanced valve with a spool in a reverse reset in an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a balanced valve with a spool in a reverse operating position according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
It should be noted that all directional indicators (such as up, down, left, right, front, rear \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
As shown in fig. 1, the valve element 2 of the present invention includes a first valve element section 201, a second valve element section 202, a third valve element section 203, a fourth valve element section 204, and a shoulder 205, wherein a first drainage hole 21 is radially disposed on the third valve element section 203 along the valve element 2, a second drainage hole 22 is axially disposed on the second valve element section 202 along the valve element 1, a third drainage hole 23 and an annular flow passage 24 are radially disposed on the first valve element section 201 along the valve element 2, a threaded hole 26 is axially disposed on the first valve element section 201 along the valve element 5, the first drainage hole 21 is communicated with the third drainage hole 23 through the second drainage hole 22, a sealing groove 25 is disposed on the first valve element section 201, and a spherical mounting hole 27 is disposed on the fourth valve element section 204.
Fig. 2 is a sectional view showing a structure of a balance valve provided with a valve core 2 according to the present invention. Balance valve 1 is provided with flange hydraulic fluid port B, hydraulic fluid port A and case hole 101, sealing washer 3 is installed in the seal groove 25 of case 2, screw plug 4 is installed in the screw hole 26 of case 2, shutoff second drainage hole 22, prevent second drainage hole 22 and pilot control chamber 81 intercommunication, spheroid 9 is installed in the spherical mounting hole 27 of case 2, the right-hand member of spheroid 9 is used in the groove of spring holder 10 left end face, install sealing washer 3, the case 2 of screw plug 4 and spheroid 9 can be in the case hole 101 of balance valve 1 through the flexible horizontal slip switching-over of reset spring 11, reset spring 11 installs in disk seat 12 mounting groove, disk seat 12 passes through the thread fastening to balance valve 1 on. The pilot plunger 7 is arranged in a hole of the transition block 8 and is axially concentric with the valve core 2, and the pilot end cover 6 and the transition block 8 are connected with the balance valve 1 through the screw 5, so that the replacement and the maintenance are convenient. As shown in fig. 3, the pressure oil from the pilot end cap 6 flows into the pilot control chamber 81, acts on the second annular acting surface 71, pushes the pilot plunger 7 to slide rightward along the axial direction, the right end surface of the pilot plunger 7 further pushes the left end surface of the valve core 2 to reverse rightward against the pre-tightening force of the return spring 11, so that the first drainage hole 21 on the valve core 2 is firstly communicated with the oil port a, and the pressure oil acting on the circumference of the seal groove 25 from the flange oil port B flows through the third drainage hole 23 and the second drainage hole 22, and then flows into the oil port a through the first drainage hole 21, so that the pressure on the circumference of the seal groove 25 rapidly decreases, thereby reducing the friction force generated by the seal ring 3 in the reversing process of the valve core 2, and reducing the hysteresis of the balance valve, and in the reversing process of the valve core 2, the ball 9 and the spring seat 10 are mutually matched to adjust and reduce the eccentric force generated when the valve core 2 moves, thereby reducing the friction force generated when the valve core 2 reverses, and reducing the hysteresis of the balance valve. In addition, in the process that the valve core 2 is closed leftwards, the communication channel between the first drainage hole 21 and the oil port A on the valve core 2 is closed finally, so that the high-pressure oil around the seal groove 25 is communicated with the return oil A through the channel formed by the third drainage hole 23, the second drainage hole 22 and the first drainage hole 21 all the time in the process that the valve core 2 is closed, the friction force when the valve core 2 is closed leftwards is reduced, and the hysteresis loop of the balance valve is reduced.
If the valve core 2 is reversed, the ball 9 rotates in the spherical mounting hole 27 under the action of fluid power or friction force generated by the sealing ring 3, the valve core 2 is adjusted to be centered, or eccentric force is generated when the return spring 11 stretches, the ball 9 acts on the spring seat to adjust the return spring 11 so that the generated eccentric force is reduced, and then the valve core 2 is adjusted to be centered automatically when being reversed.
The area of the first annular acting surface 28 provided on the left end surface of the valve element 2 is smaller than the area of the second annular acting surface 71 provided on the left end surface of the pilot plunger 7, and the pilot control pressure acts on the second annular acting surface 71 instead of directly acting on the first annular acting surface 28, so that the pilot pressure acting area is increased, the friction force caused by the pilot pressure is reduced, the pilot pressure hysteresis is reduced, and the control characteristic of the balance valve is improved.
By arranging the annular flow passage 24 in the radial direction of the valve core 2, pressure oil distributed in a gap between the valve core 2 and the valve core hole 101 of the balance valve 1 is uniformly distributed, the valve core 2 is automatically centered when reversing in the valve core hole 101, the movement is flexible, and the hysteresis of the balance valve is reduced.
By providing the land 205 on the spool 2, the jet angle increases when the pressure oil flows through the third spool section 203, reducing the hydraulic force generated and lowering the hysteresis of the balanced valve.
While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The balance valve is characterized by comprising a balance valve body and a valve core;
a valve core hole, a flange oil port and an oil port are formed in the balance valve body, and the valve core body is movably arranged in the valve core hole of the balance valve body;
the balance valve body is connected with a power device used for the valve core body to perform reversing motion; the power device comprises a transition block and a pilot end cover; the transition block is connected with one end of the balance valve body, and a pilot plunger for driving the valve core body to perform reversing motion is movably arranged in a pilot control cavity in the transition block; the pilot end cover is connected with the transition block, a pressure oil duct is formed in the pilot end cover, and the pressure oil duct is communicated with the pilot control cavity of the transition block;
the balance valve body is connected with a return device for realizing reversing reset of the valve core body;
a sealing groove is formed in the circumferential direction of one end, facing the pilot control cavity, of the valve core body of the valve core, and a sealing ring is mounted on the sealing groove; the top of the sealing ring is abutted against the inner wall of a valve core hole of the valve body, so that a pilot control cavity positioned on one side of the sealing ring is isolated from a space in the valve body positioned on the other side of the sealing ring;
the valve core body is provided with a drainage channel, and the drainage channel comprises a first drainage hole, a second drainage hole and a third drainage hole; the second drainage hole is axially formed in the valve core body, the first drainage hole and the third drainage hole are respectively formed in the valve core body in the radial direction and are positioned on one side, away from the pilot control cavity, of the sealing ring, and the first drainage hole and the third drainage hole are communicated with the second drainage hole; the second drainage hole is not communicated with the pilot control cavity;
and in the reversing movement and the reversing reset process of the valve core body, the flange oil port and the oil port are communicated with the drainage channel through the third drainage hole and the first drainage hole.
2. The trim valve of claim 1, wherein an area of a first annular active surface of the spool body disposed toward the transition block is less than an area of a second annular active surface of the pilot plunger disposed toward the pilot end cap.
3. The balancing valve of claim 1, wherein the return means comprises a valve seat, a return spring;
the valve seat is connected with the other end of the balance valve body, and an installation groove is formed in the valve seat;
one end of the reset spring is connected with or propped against the end part of the groove of the mounting groove, and the other end of the reset spring is propped against the valve core body.
4. The balance valve according to claim 3, wherein a spring seat is connected to one end of the return spring, which abuts against the valve core body, a groove is formed in one end of the spring seat, which faces away from the return spring, and a ball body matched with the groove is connected to one end of the valve core body, which faces towards the spring seat.
5. A spool for a balanced valve according to any of claims 1-4, comprising a spool body;
the valve core body sequentially comprises a first valve core section, a second valve core section and a third valve core section along the axial direction; the first valve core section is circumferentially provided with a sealing groove, the sealing groove is used for installing a sealing ring, and the sealing ring is used for separating the spaces on two sides above the sealing groove by abutting against the valve body at the top end when the valve core is installed in the valve body; the valve core body is provided with a drainage channel for unloading the pressure oil at the circumference of the sealing groove, and the drainage channel comprises a first drainage hole, a second drainage hole and a third drainage hole; the second drainage hole is formed in the axial direction of the valve core body and is positioned on the second valve core section; the first drainage hole and the third drainage hole are respectively formed in the radial direction of the valve core body, the first drainage hole is located in the third valve core section, and the third drainage hole is located in the first valve core section and located on one side, facing the second valve core section, of the sealing groove; the first drainage hole and the third drainage hole are communicated with the second drainage hole; the second drainage hole is closed towards one end of the first valve core section.
6. The valve core according to claim 5, wherein a plug is fixedly connected to the beginning end of the second drainage hole, and the end of the second drainage hole axially extends into the valve core body.
7. The valve core according to claim 5, wherein the valve core body is circumferentially provided with an annular flow passage communicated with the third drainage hole.
8. The valve core according to claim 6, wherein the starting end of the second drainage hole is a threaded hole, and the plug is a threaded plug and is in threaded connection with the threaded hole.
9. The valve core according to claim 5, characterized in that the peripheral side of the third valve core section of the valve core body is further provided with a shoulder, and the first drainage hole is positioned on the side of the shoulder facing the second valve core section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673981.1A CN111828421B (en) | 2020-07-14 | 2020-07-14 | Valve core and balance valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673981.1A CN111828421B (en) | 2020-07-14 | 2020-07-14 | Valve core and balance valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111828421A CN111828421A (en) | 2020-10-27 |
| CN111828421B true CN111828421B (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010673981.1A Active CN111828421B (en) | 2020-07-14 | 2020-07-14 | Valve core and balance valve |
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| Country | Link |
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| CN (1) | CN111828421B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206205913U (en) * | 2016-12-01 | 2017-05-31 | 安徽理工大学 | Colliery pressure three-purpose valve based on micro forming valve element and special-shaped valve pocket |
| CN109630493A (en) * | 2019-01-24 | 2019-04-16 | 安徽理工大学 | A kind of hydraulic pressure combination valve based on micro forming spool and special-shaped valve chamber |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH444601A (en) * | 1966-12-13 | 1967-09-30 | Beringer Hydraulik Gmbh | Control device for hydraulically operated equipment |
| JP2548624B2 (en) * | 1990-07-11 | 1996-10-30 | 株式会社 ソディック | Sequence valve |
| CN101446244B (en) * | 2008-12-17 | 2010-06-09 | 中国航天科技集团公司第六研究院第十一研究所 | Single-valve core double-channel solenoid valve |
| CN101576100A (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Equilibrium valve capable of supplementing oil |
| CN101629587B (en) * | 2009-08-06 | 2011-05-11 | 宁波汉商液压有限公司 | Hydraulic balance valve |
| CN101839354A (en) * | 2010-06-10 | 2010-09-22 | 中国西电电气股份有限公司 | Valve core of hydraulic reversing valve |
| CN102943910A (en) * | 2012-12-03 | 2013-02-27 | 卓旦春 | Static balance valve |
| CN103062464A (en) * | 2013-01-28 | 2013-04-24 | 饶杰 | Spool component resistant to cavitation erosion and erosion wear for regulating valve |
| CN103982482A (en) * | 2014-05-30 | 2014-08-13 | 徐州重型机械有限公司 | Crane, telescopic arm control system of crane and balance valve |
| CN107503783A (en) * | 2017-09-21 | 2017-12-22 | 鸿大智能机械有限公司 | The valve element of safety valve |
-
2020
- 2020-07-14 CN CN202010673981.1A patent/CN111828421B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206205913U (en) * | 2016-12-01 | 2017-05-31 | 安徽理工大学 | Colliery pressure three-purpose valve based on micro forming valve element and special-shaped valve pocket |
| CN109630493A (en) * | 2019-01-24 | 2019-04-16 | 安徽理工大学 | A kind of hydraulic pressure combination valve based on micro forming spool and special-shaped valve chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111828421A (en) | 2020-10-27 |
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