CN203051275U - Plug-in-type balance valve - Google Patents

Plug-in-type balance valve Download PDF

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Publication number
CN203051275U
CN203051275U CN 201220688042 CN201220688042U CN203051275U CN 203051275 U CN203051275 U CN 203051275U CN 201220688042 CN201220688042 CN 201220688042 CN 201220688042 U CN201220688042 U CN 201220688042U CN 203051275 U CN203051275 U CN 203051275U
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CN
China
Prior art keywords
valve
chamber
spool
piston
hydraulic fluid
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Withdrawn - After Issue
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CN 201220688042
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Chinese (zh)
Inventor
陈磊
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陈磊
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Priority to CN 201220688042 priority Critical patent/CN203051275U/en
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Publication of CN203051275U publication Critical patent/CN203051275U/en
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Abstract

A plug-in-type balance valve comprises a valve body, an end cap, a plug, a valve core, a valve base and a piston, wherein the rear end of the plug is provided with a third oil port where a filter screen and a damper are arranged, the valve base is arranged in a first chamber of the valve body and located between a first oil port and a second oil port, the front section of the valve core is matched with the inner side of the end cap in a sliding mode, the rear section of the valve core is matched with the inner side of a through hole of the valve base, the valve core is provided with an axially penetrating inner cavity, a steel ball matched with the inner cavity of the valve core is arranged in the valve core, the inner cavity of the valve core is provided with a boss axially limiting the steel ball, the inner cavity of the valve core is further provided with a first spring abutting against the steel ball, the other end of the first spring abuts against the inner side of the end cap, the piston is matched with the inner side of a second chamber in a sliding mode, a stair end of a piston rod penetrates a chamber wall between the first chamber and the second chamber to be matched with the inner cavity of the valve core in a sliding mode, the rear end of the piston is provided with a one-way throttling device, and the diameter of the outer circumference of the valve body gradually reduces from the end cap end to the plug end and is in a stair-shape. The balance valve is simple in structure, compact in size and stable in operation.

Description

Cartridge balanced valve
Technical field
The utility model relates to a kind of hydrovalve, relates in particular to the cartridge balanced valve that is applied in the oil hydraulic circuit.
Background technique
In machinery such as the engineering machinery in modern times, building machinery, widely applied the oil hydraulic circuit that hoists, wherein equilibrium valve is the crucial hydraulic element of oil hydraulic motor work in the control hoisting circuit, the quality of equilibrium valve performance directly affects the performance of main frame.
Existing equilibrium valve is divided into two kinds of board-like equilibrium valve and cartridge balanced valves by Placement, in order to reduce installing space, improves system reliability in the crane telescopic oil cylinder, generally adopts cartridge balanced valve.The patent of invention that patent No. ZL01139273.8 name is called " a kind of equilibrium valve " provides a kind of equilibrium valve of plug-in type.It comprises main valve, pilot valve, above-mentioned each valve all comprises two chambeies that are positioned at the spool front and back, and wherein main valve comprises valve pocket, main valve plug, and described valve pocket is cylindrical tube, outer side surface at valve pocket is provided with the first main hydraulic fluid port A and the second main hydraulic fluid port B, and pilot valve is positioned at main valve plug.This equilibrium valve is owing to can directly insert the oil hydraulic cylinder head, because a plurality of spring structures that its main spool spring adopts rigidity to differ, mix the skewed slot on the main valve plug circular cone side, feasible control is more accurate, sensitive, even under the situation of decompression, guide's spool in the main valve plug can be closed the oil circuit between the second main hydraulic fluid port and the first main hydraulic fluid port rapidly, can prevent that load stall from descending, and plays the effect of a hydraulic lock.
But there is following shortcoming in this equilibrium valve:
1, this equilibrium valve complex structure, the required precision height, there is the requirement of coaxality just to have more than six places between each part, and the gap, place that is slidingly matched of main valve plug and valve pocket, guide's spool and main valve plug is all minimum, the manufacturing process difficulty is big, spool blocks easily during the actual use of product, thereby can influence the reliability of host work.
2, guide's spool (nonreturn valve core) of this equilibrium valve is located at main valve plug (balance valve core) inside, main valve plug wired seal request again and between valve pocket, also wired seal request between guide's spool and main valve plug.This just requires main valve plug circular cone side place that very high hardness will be arranged, preventing the wearing and tearing of part, and main valve plug inner chamber and guide's spool cooperation place hardness relative hanging down again.This has just proposed very high request to heat treatment and the material of main valve plug, has increased processing cost.
3, because guide's spool of this equilibrium valve is located at main valve plug inside, in order to reduce flow resistance, certainly will to increase the size of guide's spool, the size of main valve plug and valve pocket also will become greatly in succession, makes the overall dimensions of equilibrium valve bigger than normal.And the diameter of oil hydraulic cylinder is certain, and the oversize words of equilibrium valve will make the machining allowance of the plug-in opening on the oil hydraulic cylinder less than normal, cause certain difficulty to processing.
4, the diameter unanimity of the valve pocket cylindrical shell of this equilibrium valve causes the seal ring breakage easily during installation, thereby produces internal leakage, causes a hidden trouble for Host Security.
5, the damping link of this equilibrium valve inside is few, and poor stability under ambient conditions is disturbed is easy to generate shake.
The model utility content
Technical problem to be solved in the utility model is: overcome the above-mentioned shortcoming of prior art, provide a kind of simple in structure, volume compact, the stable and reliable operation cartridge balanced valve.
The technical scheme in the invention for solving the above technical problem is: a kind of cartridge balanced valve comprises being provided with first hydraulic fluid port and second hydraulic fluid port and first chamber being set vertically and the valve body of the tubular of second chamber, being sealedly connected on end cap and screw plug, spool, steel ball, the valve seat at valve body two ends and be with the piston of second spring respectively; Described screw plug rear end is provided with the 3rd hydraulic fluid port, and described the 3rd oil port is provided with filter screen and damper, and described valve seat is located in valve body first chamber, and between first hydraulic fluid port, second hydraulic fluid port; Described spool leading portion is slidingly tied in the end cap, the back segment of described spool is matched with in the through hole of valve seat, described spool is provided with the inner chamber that axially runs through, be provided with first steel ball that matches with valve core cavity in the described spool, and described valve core cavity is provided with for the boss that steel ball is carried out axial limiting, described valve core cavity is provided with first spring that offsets with first steel ball, and the other end of described first spring is butted in the end cap; Described piston cunning is assigned in second chamber, and the stepped end of piston rod passes the locular wall between first chamber and second chamber and be slidingly tied in the inner chamber of spool, and described piston rear end is provided with the one-way throttle device.
Compared with prior art, advantage of the present utility model is: this cartridge balanced valve is simple in structure, volume compact, and coaxality is less between each part, and the place that is slidingly matched is less demanding, and manufacturing process is simple.This cartridge balanced valve only is provided with a spool, and some technologic problems that relate to when need not to consider main valve plug and guide's spool plug-in mounting have reduced processing cost.And the easier assurance of the size of this equilibrium valve can be plugged in easily into the oil hydraulic cylinder head.And the periphery of valve body is gradually little stepped of size, and the upper and lower diameter dimension of the valve body of this equilibrium valve is gradually little, can not cause the seal ring breakage during installation, can not produce internal leakage.
As improvement, described one-way throttle device is fixed in the ear end face of piston, and described one-way throttle device comprises first damper and second steel ball, and described second steel ball places in the 3rd chamber of piston and with the valve port of first damper and matches.Add the damper that the screw plug rear end is provided with, this cartridge balanced valve has just comprised two damping links.The pressure that produces after two damping rings flow successively is decompression back pressure, can improve the stability of equilibrium valve like this, reduces vibrations.
Description of drawings
Fig. 1 is the structural representation of the utility model cartridge balanced valve.
Fig. 2 is the structural representation of the utility model cartridge balanced valve.(when load is risen)
Fig. 3 is the structural representation of the utility model cartridge balanced valve.(when load descends)
Fig. 4 is the application hydraulic schematic diagram of the utility model cartridge balanced valve.
Shown in Fig. 1-4: 1 end cap, 2 valve bodies, 2.1 first excircles, 2.2 second excircles, 2.3 the 3rd excircles, 2.4 are circumference, 3 first springs, 4 spring seats, 5 first steel balls, 6 spools, 6.1 boss, 7 valve seats, 8 piston rods, 9 second springs, 10 second steel balls, 11 pistons, 12 first dampers, 13 second dampers, 14 screw plugs, 15 filter screens all round.
A first hydraulic fluid port, B second hydraulic fluid port, X, the 3rd hydraulic fluid port.
G first chamber, H second chamber, I the 3rd chamber, J the 4th chamber.
A first radial direction through hole, b second radial direction through hole, c third through-hole, d the 4th radial direction through hole, e fifth hole, f the 6th through hole.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is further described.
As shown in Figure 1, a kind of cartridge balanced valve comprises being provided with the first hydraulic fluid port A and the second hydraulic fluid port B and the valve body 2 of the tubular of the first chamber G and the second chamber H is set vertically, is sealedly connected on end cap 1 and screw plug 14, spool 6, steel ball, the valve seat 7 at valve body 2 two ends and be with the piston 11 of second spring respectively; Described screw plug 14 rear ends are provided with the 3rd hydraulic fluid port X, and described the 3rd hydraulic fluid port X place is provided with filter screen 15 and second damper 13, and described valve seat 7 is located in the valve body 2 first chamber G, and between the first hydraulic fluid port A, the second hydraulic fluid port B; Described spool 6 leading portions are slidingly tied in the end cap 1, the back segment of described spool 6 is matched with in the through hole of valve seat 7, described spool 6 is provided with the inner chamber that axially runs through, be provided with first steel ball 5 that matches with spool 6 inner chambers in the described spool 6, and described spool 6 inner chambers are provided with for the boss that steel ball is carried out axial limiting, described spool 6 inner chambers are provided with first spring 3 that offsets with first steel ball 5, and the other end of described first spring 3 is butted in the end cap 1; Described piston 11 sliding being assigned in the second chamber H, and the stepped end of piston rod 8 passes the locular wall between the first chamber G and the second chamber H and is slidingly tied in the inner chamber of spool 6, and described piston 11 rear ends are provided with the one-way throttle device.
Described one-way throttle device is fixed in the ear end face of piston 11, and described one-way throttle device comprises first damper 12 and second steel ball 10, and described second steel ball 10 places in the 3rd chamber I of piston 11 and with the valve port of first damper 12 and matches.
The periphery that described spool 6 back segments match with the through hole of valve seat 7 is conical surface, and the outer conical surface of described spool 6 and valve seat 7 linear sealings.
Described spool 6 middle parts are provided with the first radial direction through hole a that is communicated with the second hydraulic fluid port B and spool 6 inner chambers, and its rear end is provided with the second radial direction through hole b that is communicated with the first hydraulic fluid port A and spool 6 inner chambers.
The first chamber G of described valve body 2 and the locular wall between the second chamber H are provided with the third through-hole c that is communicated with two chambers.
Described piston 11 middle parts are provided with the 4th radial direction through hole d of the 3rd chamber I that is communicated with valve body 2 second chamber H and piston 11.
The diameter of the excircle of described valve body 2 from end cap 1 end to screw plug 14 ends is reduce gradually stepped and refers to, described valve body is provided with diameter successively from end cap 1 end to screw plug 14 ends and is and reduces first excircle 2.1, second excircle 2.2, the 3rd excircle 2.3, circumference 2.4, the 5th excircle 2.5 all round gradually, and described second excircle 2.2 places are provided with outside thread, be embedded with seal ring between described first excircle 2.1 and second excircle 2.2, described the 3rd excircle 2.3 and circumference 2.4 places all round all is embedded with seal ring.
Fig. 4 is the application hydraulic schematic diagram of the utility model cartridge balanced valve, the first hydraulic fluid port A of this cartridge balanced valve links to each other with the hydraulic fluid port A1 of selector valve, the second hydraulic fluid port B links to each other with hydraulic rod rodless cavity B1, the hydraulic fluid port B3 of selector valve links to each other with rod chamber B2, the 3rd hydraulic fluid port X of oil hydraulic cylinder respectively, and the other two hydraulic fluid port P of selector valve and O be cut-in pressure oil sources and oil sump tank respectively.
Working principle of the present utility model is shown in Fig. 2,3:
1, when load is risen, selector valve is beaten in position, a left side, hydraulic oil enters valve body 2 from the first hydraulic fluid port A, on the one hand hydraulic oil enters the second chamber H by the third through-hole c that the first chamber G and the locular wall between the second chamber H of valve body 2 is provided with, entered the 3rd chamber I of piston again by the 4th radial direction through hole d on the piston 6, and second steel ball 10 withstood on the valve port of first damper 12, block the passage that is entered the 4th chamber J by the 3rd chamber I.On the other hand, hydraulic oil acts on the impacting force that overcomes first spring 3 on the spool 6, and spool 6 is moved to left, and at this moment, hydraulic oil can flow to the second hydraulic fluid port B by the first hydraulic fluid port A, and enters the rodless cavity B1 of oil hydraulic cylinder, rises thereby promote load.
2, when load descends, selector valve is got to right position, hydraulic oil enters the 4th chamber J by the 3rd hydraulic fluid port X by the 6th through hole f on filter screen 15 and second damper 13.At this moment, the fifth hole e of part hydraulic oil on first damper 12 backs down the 3rd chamber I that second steel ball 10 flows into piston 11, the 4th radial direction through hole d that is provided with by piston 11 middle parts flows into the second chamber H again, the third through-hole c that is provided with by the locular wall between valve body 2 first chamber G and the second chamber H flows into the first hydraulic fluid port A again, at this moment the pressure of the hydraulic oil of the first hydraulic fluid port A is the pressure that the hydraulic oil of the 3rd hydraulic fluid port X produces after two damper throttlings, be decompression back pressure in fact, can improve the stability of equilibrium valve like this.Other a part of hydraulic oil of the 4th chamber J acts on the piston 11, and the active force promotion piston 11 that overcomes second spring 9 moves to left, piston rod 8 external parts of piston 11 top earlier back down first steel ball 5 to first steel ball 5 and the active force that overcomes first spring 3, at this moment, the hydraulic oil of the second hydraulic fluid port B flows into spool 6 inner chambers by the first radial direction through hole a at spool 6 middle parts, and flow into the first hydraulic fluid port A by the second radial direction through hole b of spool 6 rear ends, thereby make load slowly descend.Piston 11 continues to move to left, and piston rod 8 external parts of piston 11 push up on the spool 6, and makes spool 6 break away from valve seat 7, and at this moment the hydraulic oil of the second hydraulic fluid port B flows into the first hydraulic fluid port A by the gap between spool 6 and the valve body 2 again, thereby makes the load rate of descent accelerate.
3, when loadlock aloft the time, selector valve is beaten at meta, the 3rd hydraulic fluid port X takes back fuel tank, the path of cut-out pressure source and selector valve A1, spool 6 makes spool 6 reset under the pressure effect of first spring 3 and load generation, the outer conical surface of spool 6 back segments matches with valve seat 7 again, form linear sealing, cut off the path between the first hydraulic fluid port A and the second hydraulic fluid port B, with loadlock aloft.

Claims (7)

1. cartridge balanced valve comprises being provided with first hydraulic fluid port (A) and second hydraulic fluid port (B) and first chamber (G) being set vertically and the valve body (2) of the tubular of second chamber (H), being sealedly connected on end cap (1) and screw plug (14), spool (6), steel ball, the valve seat (7) at valve body (2) two ends and be with the piston (11) of second spring respectively; Described screw plug (14) rear end is provided with the 3rd hydraulic fluid port (X), described the 3rd hydraulic fluid port (X) locates to be provided with filter screen device, damping device, it is characterized in that: described valve seat (7) is located in valve body (2) first chambers (G), and is positioned between first hydraulic fluid port (A), second hydraulic fluid port (B); Described spool (6) leading portion is slidingly tied in the end cap (1), the back segment of described spool (6) is matched with in the through hole of valve seat (7), described spool (6) is provided with the inner chamber that axially runs through, be provided with first steel ball (5) that matches with spool (6) inner chamber in the described spool (6), and described spool (6) inner chamber is provided with for the boss (6.1) that steel ball is carried out axial limiting, described spool (6) inner chamber is provided with first spring (3) that offsets with first steel ball (5), and the other end of described first spring (3) is butted in the end cap (1); Described piston (11) is sliding to be assigned in second chamber (H), and the stepped end of piston rod (8) is passed the locular wall between first chamber (G) and second chamber (H) and is slidingly tied in the inner chamber of spool (6), and described piston (11) rear end is provided with the one-way throttle device; Described valve body (2) is held to the diameter of the excircle of screw plug (14) end from end cap (1) and is reduce gradually stepped.
2. cartridge balanced valve according to claim 1, it is characterized in that: described one-way throttle device is fixed in the ear end face of piston (11), described one-way throttle device comprises first damper (12) and second steel ball (10), and described second steel ball (10) places in the 3rd chamber (I) of piston (11) and with the valve port of first damper (12) and matches.
3. cartridge balanced valve according to claim 1, it is characterized in that: described spool (6) back segment is conical surface with the periphery that the through hole of valve seat (7) matches, and the outer conical surface of described spool (6) and valve seat (7) linear sealing.
4. a kind of cartridge balanced valve according to claim 1, it is characterized in that: described spool (6) middle part is provided with first radial direction through hole (a) that is communicated with second hydraulic fluid port (B) and spool (6) inner chamber, and its rear end is provided with second radial direction through hole (b) that is communicated with first hydraulic fluid port (A) and spool (6) inner chamber.
5. cartridge balanced valve according to claim 1 is characterized in that: first chamber (G) of described valve body (2) and the locular wall between second chamber (H) are provided with the third through-hole (c) that is communicated with two chambers.
6. cartridge balanced valve according to claim 1 is characterized in that: the 4th radial direction through hole (d) that is provided with the 3rd chamber (I) that is communicated with valve body (2) second chambers (H) and piston (11) in the middle part of the described piston (11).
7. cartridge balanced valve according to claim 1, it is characterized in that: described valve body (2) is held from end cap (1) and is reduce gradually stepped to the diameter of the excircle of screw plug (14) end and refers to, described valve body is held from end cap (1) and is provided with diameter successively to screw plug (14) end and is and reduces first excircle (2.1) gradually, second excircle (2.2), the 3rd excircle (2.3), circumference (2.4) all round, the 5th excircle (2.5), and described second excircle (2.2) locates to be provided with outside thread, be embedded with seal ring between described first excircle (2.1) and second excircle (2.2), described the 3rd excircle (2.3) and circumference (2.4) all round locates all to be embedded with seal ring.
CN 201220688042 2012-12-13 2012-12-13 Plug-in-type balance valve Withdrawn - After Issue CN203051275U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220688042 CN203051275U (en) 2012-12-13 2012-12-13 Plug-in-type balance valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220688042 CN203051275U (en) 2012-12-13 2012-12-13 Plug-in-type balance valve

Publications (1)

Publication Number Publication Date
CN203051275U true CN203051275U (en) 2013-07-10

Family

ID=48734233

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201220688042 Withdrawn - After Issue CN203051275U (en) 2012-12-13 2012-12-13 Plug-in-type balance valve

Country Status (1)

Country Link
CN (1) CN203051275U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104566A (en) * 2012-12-13 2013-05-15 陈磊 Plug-in mounting type balance valve
CN103498824A (en) * 2013-10-14 2014-01-08 徐州重型机械有限公司 Balance valve device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104566A (en) * 2012-12-13 2013-05-15 陈磊 Plug-in mounting type balance valve
CN103498824A (en) * 2013-10-14 2014-01-08 徐州重型机械有限公司 Balance valve device
CN103498824B (en) * 2013-10-14 2015-11-25 徐州重型机械有限公司 A kind of balancing valve apparatus

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GR01 Patent grant
RGAV Abandon patent right to avoid regrant
AV01 Patent right actively abandoned

Granted publication date: 20130710

Effective date of abandoning: 20150527