JP3150474U - Flow control valve - Google Patents

Abstract

A flow control valve for stabilizing the operation of a slide valve body of a control valve is provided. A pressure fluid that houses a valve body 2 having a first slide portion 3 and a second slide portion 4 so as to be slidable in a valve shaft direction and supplies a pressure fluid from a pressure fluid source 10 between both slide portions. A pressure fluid output path 6 that outputs while controlling the pressure fluid by the operation of the valve body 2 is provided, and the pressure fluid supply path 5 is formed between the second slide portion 4 and the valve box 1 end. This is a control valve provided with a communication passage 5P for communicating with the outer chamber K2. Each of these communication paths is provided with a second orifice OF2. [Selection] Figure 1

Description

  The present invention relates to a hydraulic control valve that is used when a working machine or the like is driven using pressure fluid, and that outputs pressure oil as pressure fluid with stable flow control.

Examples of the flow rate control valve include JP-A-5-204465.
This flow control valve is provided with various structures, an example of which is shown in FIG.
The configuration of this type of flow control valve CV shown in FIG. 3 is a valve box 1 having a circular cross section, and the valve body 2 can be reciprocated in a confidential state by a fluid such as oil inside. It is stored. The valve body 2 has a shorter axis than the valve box 1, a first slide part 3 is formed at one end, and a second slide part 4 is formed at the other end. A first outer chamber K <b> 1 and a second outer chamber K <b> 2 are formed on the outer sides of the first slide portion 3 and the second slide portion 4 between the end portions of the valve box 1.

Connected to the central portion of the valve box 1 are a pressure fluid supply path 5 that connects the pressure fluid source 10 and the valve box 1, and a pressure fluid output path 6 that outputs the fluid while controlling the fluid.
The pressure fluid supply passage 5 is provided with a first orifice OF1 having a fixed opening, and the pressure fluid supply passage 5 on the pressure fluid source 10 side from the first orifice OF1 is connected to the first outer chamber K1. The pressure fluid supply path 5 is connected to the second outer chamber K2 via the communication path 5P while being connected via the connection path 9. In the second outer chamber K2, a compression spring 7 is interposed between the second slide portion 4 and the end of the valve box 1 as shown in the drawing.

また、第１スライド部３と第２スライド部４の受圧面積をＡ２、前記両スライド部に作用する流体力をＦＦ、圧縮バネ７の付勢力をＦＳとすると、両スライド部に作用する力のつり合いから次の第２式が成立する。

また、上記の第１式と第２式から次の第３式が成立する。

この第３式から、前記付勢力ＦＳと流体力ＦＦの影響を無視できるものとすれば、流量制御弁ＣＶの流量Ｑは、圧力流体出力路６における下流圧Ｐ３に関わらず一定となり、流量制御が可能となる。 In the above configuration, the principle of outputting the pressure fluid from the pressure fluid output path 6 while controlling the pressure fluid will be described. In the flow control valve CV shown in FIG. 3, the flow rate Q of the pressure fluid is defined as follows: the opening area A1 of the first orifice OF1, the fluid density ρ, the pressure before and after the first orifice OF1, P1, P2, and C as the flow coefficient. The following first formula is obtained.

Further, when the pressure receiving area of the first slide portion 3 and the second slide portion 4 is A2, the fluid force acting on both the slide portions is FF, and the biasing force of the compression spring 7 is FS, the force acting on both slide portions is The following second formula is established from the balance.

Further, the following third formula is established from the above first formula and second formula.

If the influence of the urging force FS and the fluid force FF can be ignored from the third equation, the flow rate Q of the flow rate control valve CV becomes constant regardless of the downstream pressure P3 in the pressure fluid output path 6, and the flow rate control Is possible.

JP-A-5-204465

  However, in the conventional flow rate control valve CV described above, when the valve body 2 moves due to the pressure fluctuation downstream, the fluid force FF acting on the first slide part 3 and the second slide part 4 fluctuates, and the fluctuation is the valve By causing the body 2 to vibrate, an event that vibrates the downstream flow rate Q occurs. Particularly, the fluctuation of the fluid force FF at a large flow rate is large, and the stability of the flow control valve CV is lowered. Therefore, the valve body 2 of the flow control valve CV operates by the balance between the pressures P1 and P2 and the fluid force FF, and controls the flow rate Q. However, the slide reacts excessively due to the variation of the fluid force FF, and the control is performed. Generates an event where the flow rate oscillates.

  In view of the above points, the present invention provides a flow rate control valve that suppresses flow rate fluctuations caused by downstream pressure fluctuations and enables stable flow rate control.

  In order to solve the above problems, a flow control valve provided by the present invention includes a valve body having a first slide part formed at one end of a valve shaft and a second slide part formed at the other end, and the valve body. A valve box that slidably moves in the valve axis direction, a pressure fluid supply passage that supplies pressure fluid from a pressure fluid source between both slide parts, and a pressure that is output while controlling the pressure fluid by operating the valve body A first fluid outlet is provided in the pressure fluid supply passage, and a pressure fluid supply passage on the pressure fluid source side from the first orifice is formed by a first slide portion and a valve box end. In the flow control valve provided with a connection path connected to the direction chamber, the pressure fluid supply path below the first orifice communicates with a second outer chamber formed between the second slide portion and the valve box end. A passage is provided, and a second orifice is provided in the communication passage. It is obtained by set. The flow of the pressure fluid is regulated by this orifice, and the operation of the flow control valve is stabilized.

  The present invention is characterized by this communication path, and is a communication path that directly connects the pressure fluid supply path 5 and the second outer chamber K2. Moreover, the orifice provided in the communication path can be either fixed or changeable in opening degree.

Therefore, the fluctuation of the pressure P2 described above is dulled by this communication path, the sensitivity of the valve body 2 can be reduced, and the flow rate control can be stabilized. Specifically, the operation of the valve body is regulated by the orifice in this communication path. The movement of the valve body 2 when the fluid force FF decreases is as follows.
(1) The valve body 2 moves to the left, and the degree of opening of the throttle downstream is increased.
(2) Next, when the output flow rate increases, the pressure loss of the first orifice increases and the pressure P2 decreases.
(3) When the pressure P2 drops, the valve body 2 moves to the right, and the opening of the throttle downstream of the pressure fluid supply path 5 is narrowed.

  If the above series of reactions are sensitive, the slide vibrates starting from minute fluctuations in fluid force, and vibration of the control flow rate is generated. However, the existence of the second and third orifices in each communication path As a result, the movement of the valve body 2 becomes slow, and the vibration phenomenon does not occur.

  According to the present invention, in the flow control valve, it is possible to realize a stable flow control function against fluctuations in downstream pressure due to fluctuations in fluid force or load fluctuations.

It is a figure which shows the structure of the 1st Example of the fluid control valve by this invention. It is a figure which shows the structure of the 2nd Example of the fluid control valve by this invention. It is a figure which shows the structure of the conventional fluid control valve in connection with this invention.

  In order to solve the above problems, a flow control valve provided by the present invention includes a valve body having a first slide part formed at one end of a valve shaft and a second slide part formed at the other end, and the valve body. A valve box that slidably moves in the valve axis direction, a pressure fluid supply passage that supplies pressure fluid from a pressure fluid source between both slide parts, and a pressure that is output while controlling the pressure fluid by operating the valve body A first fluid outlet is provided in the pressure fluid supply passage, and a pressure fluid supply passage on the pressure fluid source side from the first orifice is formed by a first slide portion and a valve box end. In the flow control valve provided with a connection path connected to the direction chamber, the pressure fluid supply path below the first orifice communicates with a second outer chamber formed between the second slide portion and the valve box end. A second passage having a passage and an opening in the communication passage; Orifice in which is interposed a.

  In particular, as shown in FIG. 2, the best mode is to provide a communication passage communicating with the second outer chamber K2 in the valve body. That is, since it communicates within the flow control valve CV, the outer shape does not protrude as shown in FIG. Hereinafter, the configuration and operation of the embodiment will be described.

The first embodiment will be described below with reference to FIG.
The main components in the configuration of the flow control valve CV include a pressure fluid supply path 5 for introducing fluid from the pressure fluid source 10 and a pressure fluid output path 6 for outputting while controlling the amount of pressure fluid. A valve body 2 is interposed between the valve bodies 2 so as to be capable of reciprocating left and right. Specifically, the valve body 2 is slidably disposed in the cylindrical valve box 1 installed between the two, and the sliding operation of the valve body 2 causes the flow of the pressure fluid supply path 5 to flow. The path cross section is controlled, and the controlled pressure fluid is output. The valve body 2 is provided with a first slide portion 3 and a second slide portion 4 for enabling sliding at both ends.

  The valve box 1, which is a basic component, has a valve body 2, a first slide portion 3, and a second slide portion 4 in a cylindrical state, and is formed in a cylindrical shape having a circular cross section. Inside the valve box 1, a valve body 2 is accommodated in a secret state so as to be able to reciprocate in a fluid such as oil. Further, the valve body 2 has a shorter axis than the valve box 1, and a first outer chamber K1 and a second outer chamber K2 are provided on the left side of the first slide portion 3 and the right side of the second slide portion 4, respectively. Is formed. The pressure fluid source 10 side and the first outer chamber K1 are connected to each other from the first orifice OF1 of the pressure fluid supply path 5 through a connection path 9.

  In the configuration described above, the embodiment shown in FIG. 1 is provided with a communication path 5P that allows the pressure fluid supply path 5 and the second outer chamber K2 to communicate with each other. In this embodiment, the second orifice OF2 is interposed in the communication path 5P. In this embodiment, the communication path 5P protrudes from the valve box 1 of the flow control valve CV, but the second orifice OF2 is easily provided. That is, for example, the second orifice OF2 having a small-diameter hole whose inner diameter is smaller than that of the communication path 5P can be simply installed in the communication path 5P. With the above configuration, as described above, the flow of the pressure fluid between the pressure fluid supply path 5 and the second outer chamber K2 is regulated by the intervention of the second orifice OF2, and the operation of the flow control valve CV is stabilized.

Next, the configuration and operation of the second embodiment of the present invention will be described with reference to FIG.
The main components in the configuration of the flow control valve CV include a pressure fluid supply path 5 that introduces fluid from the pressure fluid source 10 and a pressure fluid output path 6 that outputs while controlling the amount of pressure fluid. A valve body 2 is interposed between the valve bodies 2 so as to be capable of reciprocating left and right. Specifically, the valve body 2 is slidably disposed in a cylindrical valve box 1 installed between the two, and the sliding operation of the valve body 2 causes the pressure fluid flow supply path 5 to be slid. The flow path cross section is controlled, and the controlled pressure fluid is output. The valve body 2 is provided with a first slide portion 3 and a second slide portion 4 for enabling sliding at both ends.

  The valve box 1, which is a basic component, has a valve body 2, a first slide portion 3, and a second slide portion 4 in a cylindrical state, and is formed in a cylindrical shape having a circular cross section. Inside the valve box 1, a valve body 2 is accommodated in a secret state so as to be able to reciprocate in a fluid such as oil. The valve body 2 has a shorter axis than the valve box 1, and a first outer chamber K1 and a second outer chamber K2 are formed outside the first slide portion 3 and the second slide portion 4, respectively. . The pressure fluid source 10 side and the first outer chamber K1 are connected to each other from the first orifice OF1 of the pressure fluid supply path 5 via a connection path 9. A compression spring 7 is interposed at the ends of the second slide portion 4 and the second outer chamber K2.

In the second embodiment of the present invention, a communication path between the pressure fluid supply path 5 and the second outer chamber K2 is formed in the second slide portion 4 of the valve body 2, and a third orifice OF3 is formed in the communication path 2P. This is an example. As shown in FIG. 2, the third orifice OF <b> 3 is installed in the shaft core portion of the valve body 2.
More specifically, the communication path 2P is perforated in the axial direction from the right end of the second slide portion 4, and is bent upward at the position of the pressure fluid supply path 5 so as to connect the pressure fluid supply path 5 and the second outer chamber. Communication with K2 is possible.

  As shown in the figure, in the second embodiment, the communication passage 2P is provided in the valve body 2, so that the third orifice OF3 is provided in the valve body 2 itself, and the flow rate control valve CV is compared with the first embodiment. It is small without protruding outward. With the above configuration, the flow of the pressure fluid between the second outer chambers K2 is regulated by the interposition of the third orifice OF3 as described above, and the operation of the flow control valve CV is stabilized.

  The structure and features of the present invention are as described above, but the present invention is not limited to the above and illustrated examples, and various modifications other than the above can be given. For example, in the example of FIG. 1, the communication path 5P is formed in a protruding shape spaced from the valve box 1, but this communication path 5P is attached to the outer peripheral surface of the valve box 1 integrally or in contact with it, The protrusion can be made smaller.

  According to the present invention, it is used as a hydraulic flow control valve that uses oil as a fluid, and can be used as a drive source for driving an aircraft wing, for example. It is also used as a power source for transportation and other purposes.

DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body 3 1st slide part 4 2nd slide part 5 Pressure fluid supply path 6 Pressure fluid output path 7 Compression spring OF1 1st orifice OF2 2nd orifice OF3 3rd orifice 9 Connection path 10 Pressure fluid source P1 Pressure P2 pressure P3 lower pressure flow FF fluid force FS urging force CV flow control valve K1 first outer chamber K2 second outer chamber 2P communication passage 5P communication passage A1 opening area A2 pressure receiving area ρ fluid density C flow coefficient Q flow rate

Claims (5)

  A valve body having a first slide part formed at one end of the valve shaft and a second slide part formed at the other end, a valve box for slidably storing the valve body in the valve shaft direction, and a pressure fluid source A pressure fluid supply path for supplying the pressure fluid from both the slide portions, and a pressure fluid output path for outputting the pressure fluid while controlling the pressure fluid by the operation of the valve body, and the pressure fluid supply path includes a first orifice. In a flow control valve provided with a connecting path for connecting a pressure fluid supply path on the pressure fluid source side from the first orifice to a first outer chamber formed by the first slide portion and the valve box end. A communication passage is provided for communicating the pressure fluid supply path downstream of the first orifice with a second outer chamber formed between the second slide portion and the valve box end, and the second orifice is provided in the communication passage. A flow control valve characterized by being interposed.   The flow rate control valve according to claim 1, wherein the communication path is a communication path provided in the second slide portion of the valve body.   The flow control valve according to claim 1, wherein the communication path is a communication path in which a second outer chamber of the valve body and a pressure fluid supply path are provided outside the valve box.   The flow control valve according to claim 1, wherein the opening degree of the second orifice can be changed.   The flow control valve according to claim 1, wherein an opening degree of the second orifice is fixed.

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