CN202732520U - Overload valve - Google Patents
Overload valve Download PDFInfo
- Publication number
- CN202732520U CN202732520U CN 201220348542 CN201220348542U CN202732520U CN 202732520 U CN202732520 U CN 202732520U CN 201220348542 CN201220348542 CN 201220348542 CN 201220348542 U CN201220348542 U CN 201220348542U CN 202732520 U CN202732520 U CN 202732520U
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- Prior art keywords
- valve seat
- valve
- spring
- oil
- overload
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Abstract
The utility model discloses an overload valve. The overload valve comprises a valve body, a valve seat, a valve core and a spring. The valve body is provided with an oil inlet cavity, an oil return cavity and a valve seat hole, the valve seat is movably sleeved in the valve seat hole and provided with a first activity stroke and an oil inlet used to communicate the oil inlet cavity with the oil return cavity. The spring is abutted against the valve core and drives the valve core to be abutted against the valve seat so as to block the oil inlet, and the valve core is provided with a second activity stroke. The second activity stroke is longer than the first activity stroke. Compared with the prior art, the overload valve is simple in structure, small in spring compression amount and not prone to fatigue and damage. When the overload valve is closed, impact force of the valve core on the valve seat is little, abrasion of the valve core and the valve seat is reduced greatly, and therefore reliability of the overload valve can be improved greatly and service life of the overload valve can be prolonged greatly.
Description
Technical field
The utility model relates to the valve body structure field, relates in particular a kind of overload valve, and it has the characteristics of reliability height and long service life.
Background technique
Overload valve generally is applied in the hydraulic equipment, and mainly plays level pressure overflow, voltage stabilizing, system unloaded and safety protection.Present existing overload valve, it all comprises valve body, valve seat, spool and spring at least, is formed with oil suction chamber and oil back chamber on this valve body, is formed with oil inlet hole on this valve seat, and this oil inlet hole is communicated in oil suction chamber and oil back chamber, and this spool and spring are inconsistent; During normal state, under the effect of spring, this spool can tightly be resisted against on the valve seat, thereby so that be sealed shape between oil suction chamber and the oil back chamber; And when oil suction chamber pressure reaches certain value, can overcome the elastic force of spring, overload valve is opened, thereby so that the oil of oil suction chamber enters to oil back chamber, pressure drop when oil suction chamber, then under the effect of spring, this spool can and valve seat again tightly conflict and realize sealing between oil suction chamber and the oil back chamber.
As from the foregoing, the spring in above-mentioned traditional overload valve is in the state of suppressing all the time, therefore permanent deformation and fatigue damage easily occur; And in overload valve closed moment, the impact force that spool acts on valve seat is large, sealing surface wear between spool and the valve seat is large, thereby has reduced reliability and the working life of spring, spool and valve seat, and then has also reduced simultaneously reliability and the working life of overload valve.
In view of this, the inventor has this case to produce for the defects further investigation of existing overload valve then.
The model utility content
The purpose of this utility model is to provide a kind of overload valve, with solve existing overload valve have poor reliability and working life short problem.
In order to reach above-mentioned purpose, the first solution of the present utility model is:
A kind of overload valve, wherein, comprise valve body, valve seat, spool and spring, this valve body offers oil suction chamber, oil back chamber and valve seat orifice, this valve seat activity is nested with in valve seat orifice and has the first movable stroke, and this valve seat has for the oil inlet hole that is communicated with oil suction chamber and oil back chamber; This spring and spool lean, and the actuatable valve core conflicts on valve seat to block this oil inlet hole, and this spool has the second movable stroke; The length of this second movable stroke is greater than the length of the first movable stroke.
Further, this overload valve also comprises gland, is formed with spring chamber in this gland, and this spring is installed with in spring chamber, and this spring one end leans at the gland interior edge face, and the other end acts on spool, and the end of gland is provided with the oilhole that is communicated with spring chamber and oil back chamber simultaneously.
Further, this valve seat end also is formed with boss, and this boss is an end points of the first movable stroke when contacting with the valve body interior edge face, is another end points of the first movable stroke when this boss and gland end contact.
Further, this spool comprises steel ball and the steel ball seat that is fixedly linked with steel ball, and this spring top leans against on the steel ball seat, this steel ball can with valve seat against and seal this oil inlet hole.
Further, this spool is taper valve core, and this spring top leans against on the taper valve core.
Further, this valve seat orifice diameter contacts the internal diameter of port with spool greater than the valve seat oil inlet hole.
The second solution of the present utility model is:
A kind of overload valve, wherein, comprise valve body, the first valve seat, the second valve seat, spool, the first spring and the second spring, this valve body offers the first oil suction chamber, the second oil suction chamber, oil back chamber, the first valve seat orifice and the second valve seat orifice, this the first valve seat activity is nested with in the first valve seat orifice and has the first boss that limits its movable stroke, this first valve seat has for the first oil inlet hole that is communicated with the first oil suction chamber and oil back chamber, this the second valve seat movable sheath is put in the second valve seat orifice and is had and limits its movable the second boss that forms, and this second valve seat has for the second oil inlet hole that is communicated with the second oil suction chamber and oil back chamber; This spool is arranged between the first valve seat and the second valve seat and the first oil inlet hole and the second oil inlet hole can be blocked respectively in both sides, this first spring contact mutually with the first valve seat and with the first valve seat toward the second valve seat direction ejection, this second spring contacts with the second valve seat and mutually with past the first valve seat direction ejection of the second valve seat.
Further, this overload valve also comprises the first gland and the second gland, and this first gland is to should the first oil suction chamber, and the interior edge face of this first gland is conflicted with the first spring and linked to each other, corresponding the second oil suction chamber of this second gland, the interior edge face of this second gland are conflicted with the second spring and are linked to each other.
Further, this first boss is positioned at the end of the first valve seat and is installed with at the first oil suction chamber, and this second boss is positioned at the end of the second valve seat and is installed with at the second oil suction chamber.
Further, this first valve seat orifice diameter contacts the internal diameter of port with spool greater than the first oil inlet hole; The second valve seat bore dia contacts the internal diameter of port with spool greater than the second oil inlet hole.
After adopting said structure, the overload valve that the utility model relates to, it is by allowing valve seat, the first valve seat and the second valve seat are active state, so before needs carry out the overflow release, when two oil suction chamber pressure differences meet or exceed certain value, this valve seat, the first valve seat or the second valve seat can be with spool certain strokes that moves, then live along with valve seat is limited, after this when two oil-feed oil pocket pressure differences continuation rising meets or exceeds the overload valve cracking pressure, overload valve is opened, this spool ability and valve seat, form the liquid communication gap between the first valve seat or the second valve seat for release; And when pressure difference dropped to certain value, this overload valve was again closed, this moment is because valve seat, the first valve seat or the second valve seat can travelling backwards, had so reduced spool and had acted on impact force on the valve seat.Compared with prior art, the utility model is simple in structure, and amount of spring compression is little, and indefatigability is damaged, and when overload valve was closed, spool was less to the impact force of valve seat, and the wearing and tearing of spool and valve seat reduce greatly, can greatly improve reliability and the working life of overload valve.
Description of drawings
Fig. 1 is the structural representation that the utility model relates to a kind of overload valve the first embodiment;
Fig. 2 is the topology view that the utility model relates to a kind of overload valve the second embodiment.
Among the figure:
Single-track overload valve 100
Boss 122 spools 13
Two-way overload valve 200
The second oil suction chamber 212 oil back chambers 213
The first valve seat orifice 214 second valve seat orifice 215
The first valve seat 22 first boss 221
The first oil inlet hole 222 second valve seats 23
The second boss 231 second oil inlet holes 232
Spool 24 first springs 25
The second spring 26 first glands 27
The second gland 28.
Embodiment
In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.
As shown in Figure 1, it relates to a kind of the first embodiment of overload valve for the utility model, it is single-track overload valve 100, this single-track overload valve 100 comprises valve body 11, valve seat 12, spool 13 and spring 14, this valve body 11 offers oil suction chamber 111, oil back chamber 112 and valve seat orifice 113, these valve seat 12 activities are nested with in valve seat orifice 113 and have the first movable stroke, this valve seat 12 has oil inlet hole 121, this oil inlet hole 121 is used for being communicated with oil suction chamber 111 and oil back chamber 112, and valve seat orifice 113 diameter D1 contact the inside diameter D 2 of port with spool 13 greater than valve seat oil inlet hole 121 simultaneously; This spring 14 leans with spool 13, and be used for driving spool 13 conflicts at valve seat 12, thereby play the effect of blocking this oil inlet hole 121,13 of this spools have the second movable stroke, the length of this second movable stroke is greater than the length of the first movable stroke, so after valve seat 12 is finished its first movable stroke, this spool 13 can continue motion, so so that release carried out.
In the present embodiment, this overload valve also comprises gland 15, is formed with spring chamber 151 in this gland 15, and the end of gland is provided with several oilholes 152 that is communicated with spring chamber 151 and oil back chamber 112 simultaneously.This spring 14 is installed with in spring chamber 151, and these spring 14 1 ends lean at gland 15 interior edge faces, and the other end acts on spool 13; This spool 13 specifically can comprise steel ball 131 and the steel ball seat 132 that is fixedly linked with steel ball 131, and this moment, this spring 14 leaned on steel ball seat 132, this steel ball 131 can with valve seat 12 against and seal this oil inlet hole 121.In addition, this spool 13 can also be taper valve core, and this moment, 14 on this spring leaned on taper valve core.
As shown in Figure 1, these valve seat 12 ends also are formed with boss 122, and two end points of this first movable stroke are respectively: when this boss 122 contacts with valve body 11 interior edge faces and this boss 122 during with the gland end contact.The working principle of the present embodiment is described below in conjunction with Fig. 1:
When the pressure of oil suction chamber 111 reaches and surpasses certain value be, hydraulic coupling forces valve seat 12 and spool 13 to move to the left side until valve seat 12 left ends contact with the gland end to the active force of valve seat 12, when hydraulic coupling continues to raise, hydraulic coupling overcomes spring force to the active force of spool 13, force spool 13 to continue to left movement, fluid in the spring chamber 151 is by the oilhole 152 and oil back chamber 112 conductings of gland 15 ends, and this moment, overload valve was opened; Then the overload valve through opening is by oil back chamber 112 oil returns for oil suction chamber 111 pressure oils, and when input pressure descended, overload valve was closed, spool 13 and together travelling backwards of valve seat 12.When pressure drop to certain value is, valve seat 12 is moved back into initial position.
As shown in Figure 2, it relates to a kind of the second embodiment of overload valve for the utility model, and it is a kind of two-way overload valve 200, and the pressure that it can control two active chambers allows the pressure difference in two chambeies guarantee in setting range.
This two-way overload valve 200, comprise valve body 21, the first valve seat 22, the second valve seat 23, spool 24, the first spring 25 and the second spring 26, this valve body 21 offers the first oil suction chamber 211, the second oil suction chamber 212, oil back chamber 213, the first valve seat orifice 214 and the second valve seat orifice 215, these the first valve seat 22 activities are nested with in the first valve seat orifice 214 and have the first boss 221 that limits its movable stroke, this first valve seat 22 has for being communicated with first oil inlet hole 222 of the first oil suction chamber 211 with oil back chamber 213, these the second valve seat 23 activities are nested with in the second valve seat orifice 215 and have and limit its movable the second boss 231 that forms, and this second valve seat 23 has for being communicated with second oil inlet hole 232 of the second oil suction chamber 212 with oil back chamber 213.
This spool 24 is arranged between the first valve seat 22 and the second valve seat 23, and the first oil inlet hole 222 and the second oil inlet hole 232 can be blocked respectively in the both sides of this spool 24, this first spring 25 contact mutually with the first valve seat 22 and with the first valve seat 22 toward the 23 direction ejections of the second valve seat, this second spring 26 contacts with the second valve seat 23 and mutually with 23 past the first valve seat 22 direction ejections of the second valve seat.
Need to prove, this first valve seat orifice 214 diameter D3 contact the inside diameter D 4 of port with spool 24 greater than the first oil inlet hole 222; The second valve seat orifice 215 diameter D5 contact the inside diameter D 6 of port with spool 24 greater than the second oil inlet hole 232, so so that the fluid in the first oil suction chamber and the second oil suction chamber can promote the first valve seat 22 and 23 motions of the second valve seat
More specifically, this overload valve also comprises the first gland 27 and the second gland 28,27 pairs on this first gland should the first oil suction chamber 211, the interior edge face of this first gland 27 is conflicted with the first spring 25 and is linked to each other, these the second gland 28 corresponding second oil suction chambers 212, the interior edge face of this second gland 28 are conflicted with the second spring 26 and are linked to each other.As shown in Figure 2, this first boss 221 is positioned at the end of the first valve seat 22 and is installed with at the first oil suction chamber 211, and this second boss 231 is positioned at the end of the second valve seat 23 and is installed with at the second oil suction chamber 212.
So, when the oil pressure of the first oil suction chamber 211 is a certain amount of greater than the second oil suction chamber 212, the first valve seat 22 meetings this moment promote spool 24 and the second valve seat 23 moves right, until the first boss 221 of the first valve seat 22 after to valve body 21, fluid in this first oil suction chamber 211 can be pushed spool 24 open by the first oil inlet hole 222, thereby realizes release; When the first oil suction chamber 211 pressure drops behind certain value, this second valve seat 23 and spool 24 can reset to left movement because this first valve seat 22 can produce kicking motions, so the impact force between spool 24 and the first valve seat 22 is also less; During greater than the oil pressure of the first oil suction chamber 211, its working principle is the same with oil pressure that should the second oil suction chamber 212.
In conjunction with the first embodiment and the second embodiment, the overload valve that the utility model relates to, it is by allowing valve seat 12, the first valve seat 22 and the second valve seat 23 be active state, so before needs carry out the overflow release, this valve seat 12, the first valve seat 22 or the second valve seat 23 can be with spool 13,24 certain strokes that moves, then live along with valve seat 12, the first valve seat 22 or the second valve seat 23 are limited, this moment this spool 13,24 just and form the liquid communication gap between valve seat 12, the first valve seat 22 or the second valve seat 23 for release.
When the certain value, overload valve is again closed at pressure drop, this moment is because valve seat 12, the first valve seat 22 or the second valve seat 23 can travelling backwards, has so reduced spool 13,24 and has acted on impact force on the valve seat.Compared with prior art, the utility model is simple in structure, and amount of spring compression is little, and indefatigability is damaged, and when overload valve was closed, spool was less to the impact force of valve seat, and the wearing and tearing of spool and valve seat reduce greatly, can greatly improve reliability and the working life of overload valve.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.
Claims (10)
1. overload valve, it is characterized in that, comprise valve body, valve seat, spool and spring, this valve body offers oil suction chamber, oil back chamber and valve seat orifice, this valve seat activity is nested with in valve seat orifice and has the first movable stroke, and this valve seat has for the oil inlet hole that is communicated with oil suction chamber and oil back chamber; This spring and spool lean, and the actuatable valve core conflicts on valve seat to block this oil inlet hole, and this spool has the second movable stroke; The length of this second movable stroke is greater than the length of the first movable stroke.
2. a kind of overload valve as claimed in claim 1, it is characterized in that, this overload valve also comprises gland, be formed with spring chamber in this gland, this spring is installed with in spring chamber, this spring one end leans at the gland interior edge face, and the other end acts on spool, and the end of gland is provided with the oilhole that is communicated with spring chamber and oil back chamber simultaneously.
3. a kind of overload valve as claimed in claim 2 is characterized in that, this valve seat end also is formed with boss, and this boss is an end points of the first movable stroke when contacting with the valve body interior edge face, is another end points of the first movable stroke when this boss and gland end contact.
4. a kind of overload valve as claimed in claim 1 is characterized in that, this spool comprises steel ball and the steel ball seat that is fixedly linked with steel ball, and this spring top leans against on the steel ball seat, this steel ball can with valve seat against and seal this oil inlet hole.
5. a kind of overload valve as claimed in claim 1 is characterized in that, this spool is taper valve core, and this spring top leans against on the taper valve core.
6. a kind of overload valve as claimed in claim 1 is characterized in that, this valve seat orifice diameter contacts the internal diameter of port with spool greater than the valve seat oil inlet hole.
7. overload valve, it is characterized in that, comprise valve body, the first valve seat, the second valve seat, spool, the first spring and the second spring, this valve body offers the first oil suction chamber, the second oil suction chamber, oil back chamber, the first valve seat orifice and the second valve seat orifice, this the first valve seat activity is nested with in the first valve seat orifice and has the first boss that limits its movable stroke, this first valve seat has for the first oil inlet hole that is communicated with the first oil suction chamber and oil back chamber, this the second valve seat movable sheath is put in the second valve seat orifice and is had and limits its movable the second boss that forms, and this second valve seat has for the second oil inlet hole that is communicated with the second oil suction chamber and oil back chamber; This spool is arranged between the first valve seat and the second valve seat and the first oil inlet hole and the second oil inlet hole can be blocked respectively in both sides, this first spring contact mutually with the first valve seat and with the first valve seat toward the second valve seat direction ejection, this second spring contacts with the second valve seat and mutually with past the first valve seat direction ejection of the second valve seat.
8. a kind of overload valve as claimed in claim 7, it is characterized in that, this overload valve also comprises the first gland and the second gland, this first gland is to should the first oil suction chamber, the interior edge face of this first gland is conflicted with the first spring and is linked to each other, corresponding the second oil suction chamber of this second gland, the interior edge face of this second gland are conflicted with the second spring and are linked to each other.
9. a kind of overload valve as claimed in claim 7 is characterized in that, this first boss is positioned at the end of the first valve seat and is installed with at the first oil suction chamber, and this second boss is positioned at the end of the second valve seat and is installed with at the second oil suction chamber.
10. a kind of overload valve as claimed in claim 7 is characterized in that, this first valve seat orifice diameter contacts the internal diameter of port with spool greater than the first oil inlet hole; The second valve seat bore dia contacts the internal diameter of port with spool greater than the second oil inlet hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220348542 CN202732520U (en) | 2012-07-18 | 2012-07-18 | Overload valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220348542 CN202732520U (en) | 2012-07-18 | 2012-07-18 | Overload valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202732520U true CN202732520U (en) | 2013-02-13 |
Family
ID=47658223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220348542 Expired - Lifetime CN202732520U (en) | 2012-07-18 | 2012-07-18 | Overload valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202732520U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
-
2012
- 2012-07-18 CN CN 201220348542 patent/CN202732520U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
| CN102734249B (en) * | 2012-07-18 | 2015-05-20 | 严光贤 | Overload valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20150520 |
|
| RGAV | Abandon patent right to avoid regrant |