JPS5935045B2 - Flow regulating valve with pressure compensation - Google Patents

Description

【発明の詳細な説明】 本発明は逆流時に於ても流量調整可能な圧力補償付流量
調整弁に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-compensated flow rate regulating valve that is capable of regulating the flow rate even during reverse flow.

従来の圧力補償付流量調整弁はこれを通過する一方向の
流量のみを調整するもので、逆流時の流量調整を行なう
には、第１図示のように、４個の逆止弁ａ、ｂ、ｃ、ｄ
と圧力補償付流量調整弁ｅとを組合せて使用するを一般
とする。Conventional pressure-compensated flow rate adjustment valves adjust only the flow rate in one direction that passes through them, and in order to adjust the flow rate during backflow, four check valves a and b are used as shown in Figure 1. ,c,d
It is generally used in combination with a pressure-compensated flow rate regulating valve e.

このものは管路ｆからｇへ流れる流体は逆止弁ａ、流量
調整弁ｅ、逆止弁ｂの順に流れ、逆流時には逆止弁ｃ、
流量調整弁ｅ、逆止弁ｄの順に流し、該流量調整弁ｅへ
の流入方向を一定とした上で流量調整を行なうので逆止
弁による大きな流体抵抗が発生してエネルギ損失が大き
く、逆止弁を４個も組合せるので大型高価になる欠点が
あつた。本発明はこうした欠点を解決することをその目
的としたもので、２個の流出入ポートを備えた弁筺内に
、ばねにより所定位置に自動的に復帰するスプールを設
けると共に該弁筺と該スプールとにより構成され且つ一
方の面積の増大に伴ない他方の面積が減少する２個の可
変絞りを設け、各可変絞りの前方を夫々前記ポートに接
続すると共に後方をオリフィスを介して互に接続し、該
オリフィスの前後の圧力を夫々前記スプールの両側の同
面積の作用面に対向して作用させて成る。In this case, the fluid flowing from pipe f to g flows in the order of check valve a, flow rate adjustment valve e, and check valve b, and in the case of reverse flow, check valve c,
Since the flow is adjusted in the order of flow adjustment valve e and check valve d, and the flow rate is adjusted after keeping the flow direction to the flow adjustment valve e constant, a large fluid resistance is generated by the check valve, resulting in large energy loss, and the flow is reversed. Since four stop valves are combined, it has the disadvantage of being large and expensive. The present invention aims to solve these drawbacks, and includes a spool that automatically returns to a predetermined position by a spring in a valve housing equipped with two inflow and outflow ports, and a spool that automatically returns to a predetermined position with a spring. Two variable throttles are provided in which the area of one of the variable throttles decreases as the area of the other increases as the area of the other increases. The pressure at the front and rear of the orifice is applied to working surfaces of the same area on both sides of the spool, respectively.

本発明の実施例を図面第２図について説明するに、１は
弁筺、２、３は該弁筺１に形成した流出入ポート、４は
該弁筺１内に摺動自在に設けたスプール、５は該スプー
ル４に遊嵌したばね受６、７間に介在させた復帰用のば
ねでその一方のばね受は弁筺１に係止されて他のばね受
に作用する力を支承する。An embodiment of the present invention will be described with reference to FIG. 2 of the drawings. 1 is a valve housing, 2 and 3 are inflow and outflow ports formed in the valve housing 1, and 4 is a spool slidably provided in the valve housing 1. , 5 is a return spring interposed between spring receivers 6 and 7 loosely fitted to the spool 4, one of which is locked to the valve housing 1 to support the force acting on the other spring receiver. .

８、９は弁筺１とスプール４とで構成した可変絞りで、
各可変絞り８、９の前方を前記各ポート２、３に夫々連
通させ、その後方を該スプール４内に形成した中空部１
０、１１に夫々連通し、更に両中空部１０、１１をその
中間の区画壁１２に設けたオリフィス１３を介して互に
連通させ、かくて一方のポート、例えば２から流入した
流体は可変絞り８、オリフィス１３及び可変絞り９を介
して他方のポート３から流出し得るようにした。8 and 9 are variable throttles composed of valve housing 1 and spool 4,
A hollow portion 1 is formed in the spool 4, with the front of each variable throttle 8, 9 communicating with each of the ports 2, 3, and the rear thereof.
0 and 11, respectively, and furthermore, both hollow parts 10 and 11 are made to communicate with each other through an orifice 13 provided in the partition wall 12 between them, so that the fluid flowing in from one port, e.g. 8, the liquid can flow out from the other port 3 via the orifice 13 and the variable throttle 9.

１４、１５は中空部１０、１１のオリフィス１３の前後
の圧力が夫々作用する圧力室で、各圧力室１４、１５に
はスプール４の両側の同面積の作用面が露出するように
した。Reference numerals 14 and 15 denote pressure chambers to which the pressures before and after the orifice 13 of the hollow parts 10 and 11 act, respectively, and the working surfaces of the same area on both sides of the spool 4 are exposed in each pressure chamber 14 and 15.

その作用を説明するに、ポート２から流体が流人しポー
ト３から流出する場合、流入流体はオリフィス１３の前
後に於て圧力差を生じ、中空部１１内の圧力がその前方
の中空部１０の圧力よりも低下する。To explain its operation, when fluid flows from port 2 and flows out from port 3, the inflow fluid creates a pressure difference before and after the orifice 13, and the pressure inside the hollow part 11 increases to the hollow part 10 in front of it. The pressure is lower than that of .

各中空部１０，１１の圧力はそのまま両側の圧力室１４
，１５に於てスプール４の両側に作用し、この場合該ス
プール４は両圧力室１４，１５の圧力差がばね５の弾発
力よりも大きいとばね５に抗して左方に摺動され、可変
絞り８の面積が増大すると同時に可変絞り９の面積が減
少して中空部１１からポート３へと流体が流出するを妨
げ、流出流量を減少させる。このスプール４の摺動状態
にあるとき、オリフイス１３前後の差圧力がばね５の弾
発力よりも小さくなるとスプール４は図示の中立位置方
向に移動するので可変絞り９の面積が増大し、通過流量
を大ならしめ、オリフイス１３前後の差圧が大きくなり
、該スプール４はオリフイス１３の圧力差による力とば
ね５の力とが釣合つた位置で停市して一定の流量の流通
を許容する。またポート３から流入しポート２から流出
する逆流時に於ては、オリフイス１３の作用により中空
部１１側の圧力が中空部１０の圧力よりも高くなり、そ
の圧力差がばね５の弾発力を越えるとスプール４は図面
右方に摺動し、可変絞り８の面積を減少するのでポート
２へ流体が流れ難くなつて通過流量が制限さへオリフイ
ス１３の前後の圧力差がばね５の力と釣合う位置でスプ
ール４が停止し、ポート２，３間の圧力差に係わらず一
定流量がポート２から流出する。The pressure in each hollow part 10, 11 remains unchanged in the pressure chambers 14 on both sides.
, 15 act on both sides of the spool 4, and in this case, the spool 4 slides to the left against the spring 5 when the pressure difference between the pressure chambers 14 and 15 is greater than the elastic force of the spring 5. The area of the variable throttle 8 increases and the area of the variable throttle 9 decreases at the same time, preventing fluid from flowing out from the hollow portion 11 to the port 3, thereby reducing the flow rate of the fluid. When the spool 4 is in a sliding state, when the differential pressure before and after the orifice 13 becomes smaller than the elastic force of the spring 5, the spool 4 moves toward the neutral position shown in the figure, so the area of the variable orifice 9 increases and the passage By increasing the flow rate, the pressure difference before and after the orifice 13 increases, and the spool 4 stops at a position where the force due to the pressure difference of the orifice 13 and the force of the spring 5 are balanced, allowing a constant flow rate to flow. do. In addition, during reverse flow when the flow flows in from port 3 and flows out from port 2, the pressure on the hollow part 11 side becomes higher than the pressure in the hollow part 10 due to the action of the orifice 13, and this pressure difference increases the elastic force of the spring 5. Once the spool 4 has crossed the orifice 13, it slides to the right in the drawing and reduces the area of the variable throttle 8, making it difficult for fluid to flow to the port 2 and restricting the flow rate through it. At the balanced position, spool 4 stops and a constant flow flows out of port 2 regardless of the pressure difference between ports 2 and 3.

第３図はオリフイス１３の前方の可変絞りにより流量を
制御するようにした場合を示し、ポート２からポート３
へ流体が流れ、スプール４が左方へ摺動するときは可変
絞り８ａの面積が減少し、これとは逆にポート３から２
へと流れるときは可変絞り９ａが作用して流量を制御す
る。Figure 3 shows a case where the flow rate is controlled by a variable throttle in front of the orifice 13, and the flow rate is controlled from port 2 to port 3.
When fluid flows from port 3 to port 2 and the spool 4 slides to the left, the area of variable throttle 8a decreases;
When the fluid flows to, the variable throttle 9a acts to control the flow rate.

尚、オリフイス１３を可変形に構成してもよい。Note that the orifice 13 may be configured to be variable.

このように本発明によるときは、ばねにより所定位置に
復帰するスプールと、該スプールと弁筐とで構成される
２個の可変絞りを設け、各可変絞りの前方を夫々ポート
に接続すると共に後方をオリフイスを介して互に接続し
、該オリフイス前後の圧力差でスプールを摺動させたの
で正逆流を共に流量制御出来て便利であり、弁を小型化
出来ると共に弁の内部抵抗も小さくエネルギ゛損失を少
なく出来、安価に製造出来る等の効果がある。In this way, according to the present invention, two variable throttles are provided, each consisting of a spool that returns to a predetermined position by a spring, and the spool and a valve housing, and the front end of each variable throttle is connected to a port, and the rear end is connected to a port. are connected to each other through an orifice, and the spool is made to slide by the pressure difference before and after the orifice, so it is convenient to be able to control the flow rate of both forward and reverse flow, and the valve can be made smaller, and its internal resistance is also small, resulting in low energy consumption. It has the advantage of reducing losses and being able to be manufactured at low cost.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来例の説明線図、第２図は本発明流量調整弁
の截断側面図、第３図はその変形例の截断側面図である
。 １・・・・・・弁筐、２，３・・・・・・流出入ポート
、４・・・・・・スプール、５・・・・・・ばね、８，
９・・・・・・可変絞り、１３・・・・・・オリフイス
。FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is a cutaway side view of the flow rate regulating valve of the present invention, and FIG. 3 is a cutaway side view of a modification thereof. 1... Valve housing, 2, 3... Outflow/inflow port, 4... Spool, 5... Spring, 8,
9...Variable aperture, 13...Orifice.

Claims (1)

【特許請求の範囲】[Claims] １ ２個の流出入ポートを備えた弁筐内に、ばねにより
所定位置に自動的に復帰するスプールを設けると共に該
弁筐と該スプールとにより構成され且つ一方の面積の増
大に伴ない他方の面積が減少する２個の可変絞りを設け
、各可変絞りの前方を夫々前記ポートに接続すると共に
後方をオリフィスを介して互に接続し、該オリフィスの
前後の圧力を夫々前記スプールの両側の同面積の作用面
に対向して作用させて成る圧力補償付流量調整弁。1. A spool that automatically returns to a predetermined position by a spring is provided in a valve casing equipped with two inflow and outflow ports, and is composed of the valve casing and the spool, and as the area of one increases, the area of the other increases. Two variable throttles with decreasing areas are provided, and the front ends of each variable throttle are connected to the ports, respectively, and the rear ends are connected to each other through an orifice, so that the pressure before and after the orifice can be adjusted to the same level on both sides of the spool. A pressure-compensated flow rate regulating valve that operates opposite to the area-area operating surface.