CN100404884C

CN100404884C - Device and process for circulation of pressurized fluid in an actuator system

Info

Publication number: CN100404884C
Application number: CNB2004800231960A
Authority: CN
Inventors: 约恩·格伦福尔
Original assignee: IMENCO ENGINEERING AS
Current assignee: IMENCO ENGINEERING AS
Priority date: 2003-08-19
Filing date: 2004-07-30
Publication date: 2008-07-23
Anticipated expiration: 2024-07-30
Also published as: NO328098B1; WO2005017367A1; KR20060064656A; NO20033661D0; KR101023796B1; CN1836111A; NO20033661L

Abstract

A device and method for a circulating valve for an actuator (1) supplied with pressurized fluid via a directional valve (10) and a first connecting pipe (A) to a first pressurized fluid chamber (4) and a second connecting pipe (B) to a second pressurized chamber (8), respectively, where the introduction of pressurized fluid in one of the pressurized fluid chambers (4, 8) causes the operative member (6) of the actuator (1) to be displaced towards a corresponding extreme position, and where a bypass valve (12, 14) controlled by the operative member (6) is connected in a communicating manner between the connecting pipes (A, B), the bypass valve (12, 14) being arranged so as automatically to open a connection between the connecting pipes (A, B) when the operative member (6) is in a specific position.

Description

The apparatus and method that are used for the circulation of pressurized fluid of actuator system

Technical field

The present invention relates to the circulation of the pressure fluid in the actuator system, especially relate to a kind of hydraulic pressure circulating valve (hydraulic circulation valve), it is particularly suitable for hydraulic fluid needs periodic cycle to avoid the hydraulic system of decreased performance in essence.The invention still further relates to a kind of method that makes the circulation of pressurized fluid in the actuator system.

Background technique

Obviously, when in hydraulic system, using so-called environment protection type oil plant (environmental oils), if oil plant static a period of time in pipe for example will carry out self degradation (self-degradation).Among the product of this course of reaction, comprise: grape sugar and the acid reaction product (acid reaction materials) that may damage hydraulic system.

Verified, flow velocity low and may irregular use small-sized hydraulic system such as the control system that is used for valve actuator subject to this class infringement especially.

In most of the cases, if earlier its corresponding valve of actuator is not mechanically disconnected, then actuator can not periodically activate.In order to overcome this problem, prior art has been put down in writing one or more following pressure release valve (pressure reliefvalve) is set: pressure release valve is designed to open when hydraulic pressure is increased to the setting pressure of pressure release valve after actuator arrives a limit position, and hydraulic fluid circulates around actuator like this.Yet, this scheme comprises the uncertainty that whether has arrived its limit position about actuator before opening at pressure release valve, and the prerequisite of this scheme is that requirement has the device that is connected with valve, this device or show (local reading) or show that by remote control (remote reading) comes the position of indicating valve by on-the-spot.

Be also known as actuator manually operated bypass valve is set.But contact gets at this actuator may be very difficult, and therefore this method only can be used for limited application.

Summary of the invention

The objective of the invention is to solve the described defective that exists in the prior art.

According to the present invention, given feature has realized described purpose in following explanation and claims subsequently.

By being set for actuator,---operates directly or indirectly by actuator when this controlled bypass valve is designed to movement means (operative member) when actuator and is in special position and is generally limit position---controlled bypass valve that the movement means that can guarantee actuator before hydraulic fluid begins to circulate arrives its special position.Described circulation does not need to begin specific step basically just can be carried out, and does not need the movement means of actuator further to change the position just can to realize described circulation at set intervals.

In a preferred embodiment, actuator is provided with crew-served bypass valve, and described bypass valve is set to activate at arbitrary respective extreme positions place of movement means.Preferably, described valve is the relatively large mechanical type controlled one-way valve of flow area (flowarea).One-way valve must be opened by hydrodynamic pressure, and its spring force is made contributions to the active force that the direction along movement means place limit position is applied on the actuator movement means, makes this active force greater than reciprocal active force.In the application's specific part, these characteristics have been carried out detailed explanation.

Another beneficial features according to apparatus and method of the present invention is that the adjustment again of bypass valve will cause the notable change of pressure reduction in the stream.This pressure reduction changes the movement means that can be used in the indication actuator and is in special position.

The present invention is suitable for needing to make in any fluid system of circulation of fluid after complete operation.

Description of drawings

The following describes the example of the non-limitative preferred embodiment shown in the accompanying drawing, in described accompanying drawing:

Fig. 1 shows the hydraulic diagram of the valve actuator with control valve and circulating valve;

Among Fig. 2 except the movement means of actuator is in a limit position, a circulating valve is opened and circulating, shown in identical with Fig. 1; And

Fig. 3 shows an optional embodiment, wherein the hydraulic fluid chambers of actuator also can circulate (circulate out).

Embodiment

In the accompanying drawings, reference character 1 is represented the actuator of valve 2.Actuator 1 comprises: first hydraulic fluid chambers 4, the movement means that is piston 6 forms and second hydraulic fluid chambers 8, and the known necessary member (not shown) of its itself.

The hydraulic fluid of pressurization is supplied to directional control valve (directionalvalve) 10 by supplying pipe P from hydraulic pressure installation.Hydraulic fluid is back to the hydraulic pressure installation (not shown) by recurrent canal T from directional control valve 10.

The working hole of the first connecting tube A connecting direction valve 10 and first hydraulic pressure cavity 4.Second working hole of the second connecting tube B connecting direction valve 10 and second hydraulic pressure cavity 8.

Actuator 1 is provided with first controlled one-way valve (controlled one-way valve) 12, and based on illustrative purpose, first controlled one-way valve 12 is illustrated as when piston 6 and is operated by the piston 6 of actuator 1 during near its first limit position in the accompanying drawings.Described one-way valve 12 is activated by the cam (not shown) on 2 (not shown) of valve for example usually.

Second controlled one-way valve 14 is set to activated during near its second limit position when piston 6.

Referring to Fig. 1, first controlled one-way valve 12 is connected with the second connecting tube B in its ingress, thereby is connected with second hydraulic fluid chambers 8.

Second controlled one-way valve 14 is connected with connecting tube A in its ingress, thereby is connected with first hydraulic pressure cavity 4.

The outlet of controlled one-

way valve

12,14 is connected by Circulation pipe 16.

When directional control valve 10 displacement make hydraulic fluid pass through the first connecting tube A from supplying pipe P when first hydraulic fluid chambers 4 flows, piston 6 moves to its first limit position.Hydraulic fluid can flow by second one-way valve 14 and Circulation pipe 16, but can not flow forward by first one-way valve 12.

Referring to Fig. 2, when piston 6 displacements arrive its first limit position, activate first one-way valve 12 and make hydraulic fluid to flow to the hydraulic pressure installation (not shown) from Circulation pipe 16 by the second connecting tube B, directional control valve 10 and recurrent canal T.

Do not need to be moved further the piston 6 of actuator 1 like this, the pipeline of system and valve just can circulate.

Because the hydraulic fluid among the first connecting tube A must overcome the spring force in second one-way valve 14, so in cyclic process, keep in first hydraulic fluid chambers 4 than the high pressure of second hydraulic fluid chambers, 8 parts omitted.This characteristics make piston rest on its first limit position.If piston 6 is removed from its first limit position, then first one-way valve will be closed, thereby hydraulic fluid pressure will make piston shift to its first limit position once more.

In an optional embodiment, referring to Fig. 3, one-

way valve

12,14 is so that the

hydraulic fluid chambers

4,8 of actuator 1 also can be carried out the circuit mode is provided with.

Claims

1. one kind is used for actuator, (1) circulating valve device, described actuator, (1) passes through directional control valve respectively, (10) and first connecting tube, (A) pressure fluid is supplied to the first pressurized stream body cavity, (4), and by described directional control valve, (10) and second connecting tube, (B) described pressure fluid is supplied to second pressurizing chamber, (8), thus, described pressure fluid is to described pressurized stream body cavity, (4,8) one importing in makes described actuator, (1) movement means, (6) limit position to correspondence moves, it is characterized in that

At described connecting tube (A, B) be connected with the bypass valve of controlling by described movement means (6) (12,14), described bypass valve (12 in the mode that is communicated with between, 14) be set to opening described connecting tube (A, B) connection between when being in special position automatically when described movement means (6).

2. device according to claim 1 is characterized in that, described bypass valve (12,14) is made of first controlled one-way valve (12) and second controlled one-way valve (14).

3. device according to claim 2, it is characterized in that, the inlet of described first controlled one-way valve (12) is connected with described second connecting tube (B), the inlet of described second controlled one-way valve (14) is connected with described first connecting tube (A), the outlet of described one-way valve (12,14) connects by Circulation pipe (16).

4. method that makes the circulation of pressurized fluid in the actuator system, actuator wherein, (1) passes through directional control valve respectively, (10) and first connecting tube, (A) described pressure fluid is placed in the first pressurized stream body cavity, (4), and by described directional control valve, (10) and second connecting tube, (B) described pressure fluid is placed in the second pressurized stream body cavity, (8), hydraulic fluid is to described pressurized stream body cavity, (4,8) one importing in makes described actuator, (1) movement means, (6) limit position to correspondence moves, it is characterized in that

(A is connected with bypass valve (12,14) between B), and described bypass valve (12,14) is controlled by described movement means (6) at described connecting tube; When movement means (6) when being in special position, described bypass valve (12,14) is opened described connecting tube (A, B) connection between automatically.