JP3171557U - Hydraulic fuse - Google Patents

Abstract

Discharge of hydraulic fuse set capacity is ensured against damage to components downstream of a hydraulic fuse, and hydraulic oil is discharged regardless of hydraulic fuse set capacity against damage that causes excessive hydraulic oil outflow. Minimize the amount of outflow to the outside. In a component downstream of a hydraulic fuse, when excessive hydraulic fluid flows out to the outside, such as when a hydraulic pipe is broken, hydraulic pressure loss of the hydraulic fluid increases, and a sliding hydraulic seat portion 10b is used. By setting the slide hydraulic seat contact portion 14 and the slide hydraulic seat portion 10b that can rapidly shut off the flow path downstream of the hydraulic fuse by rapidly moving the slide 3 toward the Regardless of capacity, it is possible to reduce the amount of hydraulic oil flowing out. [Selection] Figure 1

Description

  The present invention limits the amount of hydraulic oil flowing out in order to guarantee the continuous operation of other components connected to the hydraulic system when hydraulic fluid flows out of the hydraulic system due to component damage, etc. It relates to a hydraulic fuse.

  In the hydraulic system, when hydraulic fluid flows out of the component due to damage, etc., the capacity required for full stroke operation of the component is slightly marginal in order to continue operation of other components connected to the hydraulic system. The hydraulic fuse set to secure the capacity with the added is used.

  Patent Document 1 relates to an electrohydraulic system including a circuit having a load to which electric power is supplied. A fuse is interposed between a load and a power source, and the fuse is opened when a certain parameter exceeds a predetermined specification. A method for protecting the output drive unit when it breaks down by interrupting the current to the load is described. (See Patent Document 1)

  FIG. 6 shows a structural diagram of the conventional hydraulic fuse, FIG. 7 shows a standby state, FIG. 8 shows a flow rate passing state, and FIG. 9 shows a hydraulic fuse state.

  As shown in FIG. 6, the hydraulic fuse is provided with an initial load in the left direction by a piston 22 incorporated in a piston side cylinder 27 a and a slide side cylinder 27 b inside the body 21 and freely movable in the axial direction, and a spring 24. The slide 23 to which is attached is incorporated. A piston-side orifice 28 is provided at the upstream position of the piston 22 of the body 21, and a slide orifice 32 is provided at the slide 23.

  In the standby state of FIG. 7, that is, when the flow rate is not required downstream of the hydraulic fuse, the hydraulic fuse inlet pressure P1 at the hydraulic oil inlet 25 and the hydraulic fuse outlet pressure P3 at the hydraulic oil outlet 26 are equal, and a flow occurs. Absent. However, in consideration of a minute flow due to leakage or the like in the downstream component, the hydraulic oil inlet 25 → the body opening left inlet 29a → the slide opening inlet 33 → the sliding orifice 32 → the hydraulic oil discharge port 26 The standby flow path d is formed.

  At that time, the slide 23 receives a rightward hydraulic pressure F2 (= ΔP2 × slide pressure receiving area) due to a slight pressure loss ΔP2 (= P2−P3) at the slide orifice 32, and the piston 22 has a body opening portion. A rightward oil pressure F1 (= ΔP1 × piston pressure receiving area) is received by pressure loss ΔP1 (= P1−P2) at the left inlet 29a. Here, P2 is the pressure after passing through the body opening left inlet 29a after passing through the body opening left inlet 29a.

  The slide 23 moves to a position where the resultant force of the oil pressures F1 and F2 becomes equal to the spring 24 reaction force Fs. However, at that position, the piston 22 cannot reach the piston hydraulic seat portion 30 of the body 21, so the fuse function does not operate. .

  Next, when the downstream components are activated, the hydraulic fuse outlet pressure P3 at the hydraulic oil discharge port 26 in the standby flow path d shown in FIG. 7 is decreased.

  In this state, the slide 23 receives a rightward hydraulic pressure F2 (= ΔP2 × slide pressure receiving area) due to a pressure loss ΔP2 (= P2−P3) at the slide orifice 32 generated by the standby flow path d.

  The slide 23 moves to a position where the body opening outlet 29b shown in FIG. 8 is opened by the balance between the oil pressure F2 and the spring 24 reaction force Fs, and the hydraulic oil inlet 25 → the body opening left inlet 29a → the sliding orifice. 32 → Pressure oil passing through the hydraulic oil passage 25 via the hydraulic oil passage 26 and the hydraulic oil inlet 25 → body opening left inlet 29 a → body opening outlet 29 b → hydraulic oil outlet 26. An outer flow path f is formed during passage.

  In this state, the piston 22 receives a rightward hydraulic pressure F1 (= ΔP1 × piston pressure receiving area) due to pressure loss ΔP1 (= P1−P2) at the body inlet left inlet 29a, and moves to the right while generating a flow rate. When the capacity set as the fuse flows downstream of the hydraulic fuse, the position shown in FIG. 9 is reached, and the piston hydraulic seat contact portion 31 of the piston 22 contacts the piston hydraulic seat portion 30 of the body 21. To block the downstream flow path.

The flow rate V flow that passes through the hydraulic fuse before the hydraulic pressure is cut off is defined as follows by the volume V fuse generated by the piston 22 in the hydraulic fuse.
V flow = {(cd1 × opening area of body opening left inlet 29a) / (cd2 × opening area of piston side orifice 28)} × V fuse
Here, cd1 and cd2 are flow coefficients of the body opening left inlet 29a and the piston-side orifice 28, respectively.

JP 2003-37929 A

  In the conventional hydraulic fuse, hydraulic oil having a set capacity of the hydraulic fuse flows out to the outside even when any form of the downstream component is damaged. The set capacity of the hydraulic fuse is set to a value obtained by adding a slight margin to the capacity required for the full stroke operation of the downstream components, so that a considerable amount of hydraulic oil flows out to the outside.

  Hydraulic oil inlet at one end of the body, hydraulic oil outlet at the opposite end of the body, orifice on the hydraulic oil inflow side of the piston side cylinder and hydraulic oil inflow side of the slide, piston side cylinder and slide side cylinder Multiple hydraulic oil openings that penetrate the inside and outside of the cylinder, the piston-side cylinder on the hydraulic oil inlet side of the body, the slide-side cylinder on the hydraulic oil discharge side of the body, and the piston hydraulic pressure on the stroke end side of the piston-side cylinder Piston and slide side having a body with a hydraulic seat portion for sliding on the stroke end side of the seat portion and the cylinder for sliding, and a hydraulic seat contact portion for piston sliding inside the piston side cylinder of the body by the action of hydraulic pressure A slide equipped with a sliding hydraulic seat contact that slides in the cylinder. And an urging means for returning the slide that reciprocates in the slide side cylinder to a home position, the hydraulic fuse having hydraulic pressure caused by the outflow of hydraulic oil due to damage to the downstream components, etc. When there is a drop, the slide in the slide-side cylinder moves rapidly to the low-pressure side to the stroke end, and the hydraulic oil is quickly blocked by the contact between the slide hydraulic seat and the slide hydraulic seat contact. It is characterized by.

  According to the present invention, the discharge of the hydraulic fuse set capacity is ensured against damage to the components downstream of the hydraulic fuse, and the hydraulic fuse set capacity is discharged when excessive hydraulic fluid flows to the outside, such as when the hydraulic pipe breaks. Regardless of the condition, the amount of hydraulic oil flowing out can be minimized.

FIG. 1A is a structural diagram of a hydraulic fuse of the present invention, and FIG. 1B is a view as viewed from the arrow A of the hydraulic fuse structural diagram of the present invention. It represents the standby state of the hydraulic fuse of the present invention. The flow rate state of the hydraulic fuse of the present invention is represented. It represents the hydraulic fuse state of the hydraulic fuse of the present invention. It represents the quick disconnection state of the hydraulic fuse of the present invention. It is a structural diagram of a conventional hydraulic fuse. This represents the standby state of a conventional hydraulic fuse. This represents the flow rate of a conventional hydraulic fuse. This represents the state of a conventional hydraulic fuse.

  The hydraulic fuse according to the present invention is installed upstream of individual components in a hydraulic system.

  FIG. 1A is a structural diagram of the hydraulic fuse according to the present invention, FIG. 1B is a view as viewed from an arrow A thereof, FIG. 2 is a standby state, FIG. The state is shown in FIG. 4, and the quick shut-off state is shown in FIG. FIG. 1B is a view as seen from the direction of the arrow A showing the slide portion channel notch 15 for the hydraulic fluid channel in the slide 3 of FIG.

  As shown in FIG. 1 (a), the hydraulic fuse according to the present invention is for a slide for rapidly shutting off a flow path at a slide 3 in addition to a hydraulic sheet portion 10a for a piston for shutting off a flow path at a piston 2 in the hydraulic fuse. This structure has a hydraulic seat portion 10b.

  That is, the slide hydraulic seat portion that was not provided in the conventional hydraulic fuse shown in FIG. 6 is provided as the slide hydraulic seat portion 10b in FIG. 1A in the present invention, and the conventional hydraulic pressure shown in FIG. In the present invention, the slide hydraulic sheet contact portion that was not provided in the fuse is provided as the slide hydraulic seat contact portion 14 in FIG.

  6 is provided as the body opening right inlet 9c of FIG. 1 (a) in the present invention, and the conventional hydraulic fuse shown in FIG. 6 is not provided in the conventional hydraulic fuse shown in FIG. In the present invention, the slide opening exit, which was not provided in the fuse, was provided as the slide opening exit 13b in FIG.

  The hydraulic fuse of the present invention is initially set in the left direction by a piston 2 which is incorporated in a piston side cylinder 7a and a slide side cylinder 7b inside the body 1 shown in FIG. A slide 3 to which a load is applied is incorporated. A piston-side orifice 8 is provided at the upstream position of the piston 2 of the body 1, and a slide orifice 12 is provided at the slide 3.

  In the standby state of FIG. 2, that is, when the flow rate is not required downstream of the hydraulic fuse, the hydraulic fuse inlet pressure P1 at the hydraulic oil inlet 5 and the hydraulic fuse outlet pressure P3 at the hydraulic oil outlet 6 are equal and a flow occurs. Absent. However, in consideration of a minute flow due to leakage or the like in the downstream component, the hydraulic oil inlet 5 → the body opening left inlet 9a → the slide opening inlet 13a → the sliding orifice 12 → the slide opening outlet 13b → the operation A standby flow path a that passes through the oil discharge port 6 is formed.

  At that time, the slide 3 receives a rightward hydraulic pressure F2 (= ΔP2 × slide pressure receiving area) due to a slight pressure loss ΔP2 (= P2−P3) at the slide orifice 12, and the piston 2 has a body opening portion. A rightward oil pressure F1 (= ΔP1 × piston pressure receiving area) is received by pressure loss ΔP1 (= P1−P2) at the left inlet 9a. Here, P2 is the pressure after passing through the body opening left inlet 9a after passing through the body opening left inlet 9a.

  The slide 3 moves to a position where the resultant force of the oil pressures F1 and F2 becomes equal to the spring 4 reaction force Fs, but the piston 2 cannot reach the piston hydraulic seat portion 10a of the body 1 at that position, so the fuse function does not operate. .

  Next, when the downstream components are activated, the hydraulic fuse outlet pressure P3 at the hydraulic oil discharge port 6 in the standby flow path a shown in FIG. 2 decreases.

  In this state, the slide 3 receives a rightward hydraulic pressure F2 (= ΔP2 × slide pressure receiving area) due to the pressure loss ΔP2 (= P2−P3) at the slide orifice 12 generated by the standby flow path a.

  The slide 3 moves to a position where the body opening outlet 9b shown in FIG. 3 is opened by the balance between the oil pressure F2 and the spring 4 reaction force Fs, and the hydraulic oil inlet 5 → the body opening left inlet 9a → the slide orifice. 12 → Sliding opening outlet 13b → In addition to the inner passage b when passing through the hydraulic oil via the hydraulic oil discharge outlet 6, the hydraulic oil inlet 5 → the body opening left inlet 9a → the body opening outlet 9b → the body opening right An outer passage c is formed when the pressure oil passes through the inlet 9c → the hydraulic oil discharge port 6.

  In this state, the piston 2 receives a rightward hydraulic pressure F1 (= ΔP1 × piston pressure receiving area) due to pressure loss ΔP1 (= P1−P2) at the body opening left inlet 9a, and moves to the right side as a fuse. When the set capacity flows downstream of the hydraulic fuse, the position reaches the position shown in FIG. 4, and the piston hydraulic seat contact portion 11 of the piston 2 comes into contact with the piston hydraulic seat portion 10 a of the body 1, thereby Block the flow path.

The flow rate V flow through which the hydraulic fuse passes before the flow path is shut off is defined as follows by the volume V fuse generated by the piston 2 in the hydraulic fuse.
V flow = {(cd1 × opening area of body opening left inlet 9a) / (cd2 × opening area of piston side orifice 8)} × V fuse
Here, cd1 and cd2 are flow coefficients of the body opening left inlet 9a and the piston-side orifice 8, respectively.
The above is the same as the function of the conventional hydraulic fuse.

  Next, in FIG. 2 or FIG. 3, when a large flow rate flows due to a sudden pressure drop, such as a pipe breakage downstream of the hydraulic fuse, the slide 3 has a standby flow path a, a pressure oil passing inner flow path b, and a pressure oil. A rightward oil pressure F due to pressure loss ΔP2 (= P2−P3) due to the outer flow path c at the time of passage is received.

  When the oil pressure F is received, the oil pressure F becomes a large value due to a large flow rate. As a result, the slide 3 compresses the spring 4 to the state shown in FIG. 5 and the slide hydraulic seat contact portion 14 of the slide 3 slides. It moves rapidly to the hydraulic seat portion 10b and shuts off the downstream flow path.

  This mechanism makes it possible to quickly shut down the downstream flow path regardless of the set capacity of the hydraulic fuse.

  The present invention is used for a hydraulic fuse.

DESCRIPTION OF SYMBOLS 1 Body 2 Piston 3 Slide 4 Spring 5 Hydraulic oil inlet 6 Hydraulic oil outlet 7a Piston side cylinder 7b Slide side cylinder 8 Piston side orifice 9a Body opening left inlet 9b Body opening outlet 9c Body opening right inlet 10a For piston Hydraulic seat part 10b Slide hydraulic sheet part 11 Piston hydraulic sheet contact part 12 Slide orifice 13a Slide opening inlet 13b Slide opening outlet 14 Slide hydraulic sheet contact part 15 Slide part flow path notch 21 Body 22 Piston 23 Slide 24 Spring 25 Hydraulic oil inlet 26 Hydraulic oil outlet 27a Piston side cylinder 27b Slide side cylinder 28 Piston side orifice 29a Body opening left inlet 29b Body opening outlet 30 Piston hydraulic seat part 31 Pis Hydraulic seat contact portion 32 Slide orifice 33 Slide opening inlet a Standby channel b Pressure oil passage inner channel c Pressure oil passage outer channel d Standby channel e Pressure channel inner channel f Pressure oil Passing outer flow path P1 Hydraulic fuse inlet pressure P2 Body opening left inlet pressure P3 Hydraulic fuse outlet pressure

Claims (1)

  Hydraulic oil inlet at one end of the body, hydraulic oil outlet at the opposite end of the body, orifice on the hydraulic oil inflow side of the piston side cylinder and hydraulic oil inflow side of the slide, piston side cylinder and slide side cylinder Multiple hydraulic oil openings that penetrate the inside and outside of the cylinder, a piston cylinder on the hydraulic oil inlet side of the body, a sliding cylinder on the hydraulic oil outlet side of the body, and a piston hydraulic pressure on the stroke end side of the piston cylinder For a piston and a slide having a body provided with a hydraulic seat portion for sliding on the stroke end side of the seat portion and the cylinder for sliding, and a hydraulic seat contact portion for piston sliding in the piston cylinder of the body by the action of hydraulic pressure A slide equipped with a sliding hydraulic seat contact that slides in the cylinder. And a biasing means for returning the slide that reciprocates in the slide cylinder to a position where the hydraulic fluid is discharged due to outflow of hydraulic oil due to damage to the downstream components. When there is a drop, the slide in the slide-side cylinder moves rapidly to the low-pressure side to the stroke end, and the hydraulic oil is quickly blocked by the contact between the slide hydraulic seat and the slide hydraulic seat contact. Features hydraulic fuse.

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