JP7228489B2 - Connecting device for fluid passage pipe - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection device for fluid passage pipes, and more particularly to a connection device for fluid passage pipes having a collection valve and a needle valve for connecting a pair of fluid passage pipes in a detachable manner. .

It is known that construction machinery and the like use an engine to drive a hydraulic pump, and use hydraulic pressure obtained by driving the hydraulic pump to perform various operations and work. For this reason, construction machines are equipped with hydraulic oil tanks for storing hydraulic oil, and engines are equipped with oil pans for storing engine oil.

By the way, construction machinery and the like gradually become contaminated and deteriorated in the components of hydraulic oil and engine oil over time, which may lead to damage to hydraulic equipment and engines if left untreated.

Therefore, it is necessary to periodically sample hydraulic oil and engine oil to check the degree of contamination and analyze the components.

As a device for sampling the hydraulic oil in the hydraulic oil tank of such hydraulic equipment and the oil in the oil pan of the engine of construction machinery, it is attached/detached between the hydraulic oil tank or oil pan and the sampling container. It is known to provide a possible fluid passage pipe connection device and sample hydraulic oil or engine oil through the fluid passage pipe connection device (see, for example, Patent Document 1).

The connection device described in Patent Document 1 includes a socket portion and a plug portion provided at the end of each fluid passage pipe for detachably connecting a pair of fluid passages. In addition, a valve having a fluid passage communicating with each other is provided inside the socket portion and the plug portion, and a spherical valve body is provided in the fluid passage of the socket portion for opening and closing the fluid passage by the spring force of a coil spring. and a plurality of ribs provided in the direction of the fluid passage for guiding the movement of the valve element of the valve mechanism. In this connection device, since a plurality of ribs for guiding the valve body are provided concentrically in the direction of the fluid passage on the inner wall of the fluid passage in which the valve mechanism is installed, there is a problem that the structure becomes complicated. .

Therefore, for example, as shown in FIG. 8, a connection device 110 is provided between the collection port block 101 and the oil collection container 102, and the connection device 110 is used to connect the oil in the oil reservoir container 103 such as a hydraulic oil tank or an oil pan. It is known to periodically sample liquid oil 104, such as hydraulic oil or engine oil.

More specifically, the collection port block 101 has a fluid passage 101a and is always fixedly attached to the oil reservoir container 103 with the inlet side of the fluid passage 101a connected to the outlet of the oil reservoir container 103. there is The liquid oil 104 in the oil reservoir container 103 is held in a state of being constantly flowed into the fluid passage 101 a of the collection port block 101 .

A connecting device 110 is arranged between the collection port block 101 and the oil collection vessel 102 . The connection device 110 includes a collection valve 111 connected to the outlet side of the fluid passage 101a provided in the collection port block 101, and a needle valve 112 connected to the tube 105, which is the fluid passage on the side of the oil collection container 102. , is equipped with The collection valve 111 and the needle valve 112 can be detachably connected to each other, and the connection and disconnection allows the pair of fluid passages, the fluid passage 101a in the collection port block 101 and the tube 105, to be attached and detached from each other. It is configured so that it can be connected by

9 and 10 are enlarged cross-sectional views showing the details of the internal structure of the connection device 110, FIG. Valve 111 is shown in a connected state with needle valve 112 attached.

The collection valve 111 has a rod-shaped valve body 111a elongated in the axial direction (direction along the axis O). A hole 113 used as a fluid passage is formed substantially in the center of the valve body 111a along the axis O of the valve body 111a so as to penetrate the front and rear ends thereof.

9, the hole 113 of the valve body 111a is connected to the needle valve 112 from the distal end portion 111b fixedly attached to the fluid passage 101a of the collection port block 101. In order toward the 111c side, the small-diameter cavity portion 113a, the first intermediate-diameter cavity portion 113b, the second intermediate-diameter cavity portion 113c, the third intermediate-diameter cavity portion 113d, the fourth intermediate-diameter cavity portion 113e, and The rear end hollow portions 113f are formed in a state of communicating with each other. In addition, each of the small-diameter cavity portion 113a, the first intermediate-diameter cavity portion 113b, the second intermediate-diameter cavity portion 113c, the third intermediate-diameter cavity portion 113d, the fourth intermediate-diameter cavity portion 113e, and the rear end cavity portion 113f. The size of the inner diameter increases in the order of small-diameter hollow portion 113a, first medium-diameter hollow portion 113b, second medium-diameter hollow portion 113c, third medium-diameter hollow portion 113d, and fourth medium-diameter hollow portion 113e. However, the inner diameter of the rear end hollow portion 113f is formed to be slightly smaller than the inner diameter of the fourth medium-diameter hollow portion 113e. In addition, the outer peripheral surface of the tip portion 111b of the valve body 111a is screwed into a female thread formed on the inner peripheral surface of the collection port block 101 on the outlet side of the fluid passage 101a, and is fixed to the collection port block 101. , and a male screw portion 111d are formed.

In the valve main body 111a, a coil spring 118 is accommodated and stretched along the axis O in the first medium-diameter cavity 113b, and the first medium-diameter cavity 113b and the second medium-diameter cavity The spool 114 is accommodated and arranged so as to be movable along the axis O while straddling the hollow portion 113c and the third medium-diameter hollow portion 113d. A ring-shaped collar 115 is commonly included in the third medium-diameter cavity 113 d and the fourth medium-diameter cavity 113 e and accommodated concentrically with the hole 113 . Furthermore, when the collar 115 is housed in the third medium-diameter cavity 113d and the fourth medium-diameter cavity 113e, a The first O-ring 116 is accommodated in the gap between the circumferential stepped portion 113g and the collar 115 in the third medium-diameter cavity portion 113d, and the axis line of the collar 115 in the third medium-diameter cavity portion 113d. A first O-ring 116 restricts the movement in the direction along O. An O-ring positioning groove 115b is provided on the inner peripheral surface of the central through hole 115a of the collar 115. As shown in FIG. A second O-ring 117 having an inner diameter smaller than the inner diameter of the collar 115 is positioned and housed concentrically with the collar 115 in the O-ring positioning groove 115b.

As shown in FIGS. 11(a) and 11(b), the spool 114 has a rod-shaped spool body 114a and an inner diameter substantially equal to the inner diameter of the first medium-diameter hollow portion 113b. A proximal flange portion 114b having an outer diameter smaller than the inner diameter of the second medium hollow portion 113c and larger than the inner diameter of the collar 15 is provided on the front end side of the spool body 114a. A tip flange portion 114c formed with a large outer diameter and a pin-shaped portion 114d projecting further forward from the spool body 114a from the center of the tip of the spool body 114a are integrally formed. The outer peripheral surface of the front portion 114e of the pin-shaped portion 114d (hereinafter referred to as "tapered portion 114e") is chamfered to form a tapered shape. In addition, cutouts 114f are provided in the spool 114 on both the left and right sides of the base end flange 114b, respectively. The cut-out amount of the cut-out portion 114f is such that the chord portion of the cut-out portion 114f is substantially flush with the outer peripheral surface of the spool body 114a.

Further, in assembling the spool 114 to the valve main body 111a, as shown in FIGS. 8, 9 and 10, the tip collar portion 114c is positioned by contacting the end surface 115c of the collar 115, which is the so-called "valve closed position". The pin-shaped portion 114 d is inserted through the first O-ring 116 into the central through hole 115 a of the collar 115 . After that, the coil spring 118 is compressed and placed in the second medium-diameter hollow portion 113c, and then the compression of the coil spring 118 is released. Then, the spring force of the coil spring 118 presses the spool 114 toward the collar 115 side, and the tip flange 114c of the spool 114 and the end face 115c of the collar 115 are brought into close contact to establish a sealed state, that is, a valve closed state. to hold the spool 114 in the "valve closed position".

The spool 114, which is pressed against the end surface 115c of the collar 115 by the spring force of the coil spring 118 and is tightly arranged with the end surface 115c of the collar 115 at the valve closed position, is externally connected to the needle portion 112a of the needle valve 112. is inserted into the valve body 111a through the rear end hollow portion 113f and the central through hole 115a of the collar 115, and when the tip of the needle portion 112a is pushed toward the coil spring 118, the coil spring 118 is spring-compressed and the spool 114 is slid to the tip portion 111b side of the valve main body 111a. The movement here is relieved by the distance S shown in FIG. , a gap is formed between the central through-hole 115a of the collar 115 and the tapered portion 114e of the pin-shaped portion 114d of the spool 114 to allow the liquid oil 104 to pass therethrough, so that the spool 114 and the collar 115 are sealed. It can be unwound to allow the collection valve 111 to valve open.

As shown in FIGS. 8, 9, 10 and 11 (c) and (d), the needle valve 112 is provided with a gripping portion 112b having a circular brim shape in the intermediate portion, and the gripping portion 112b is , a pin-shaped needle portion 112a and a connecting portion 112c, which are provided concentrically with the grip portion 112b, are integrally provided. A through-hole 120 is provided at the center of the axis of the needle valve 112 and extends forward and backward along the axis O across the needle portion 112a, the grip portion 112b, and the connecting portion 112c. A slit-like slit 121 is formed at the tip of the needle portion 112a and communicates with the through hole 120, which is cut from the tip surface of the needle portion 112a toward the grip portion 112b.

The outer diameter of the needle portion 112 a of the needle valve 112 is slightly smaller than the inner diameter of the spool 114 and slightly larger than the inner diameter of the second O-ring 117 . The needle portion 112a is tightly inserted into the central through hole 115a of the collar 115 while expanding the second O-ring 117. As shown in FIG. In addition, the axial length L1 (see FIG. 9) of the needle portion 112a extends from the outside of the collection valve 111 through the rear end hollow portion 113f and the central through hole 115a of the collar 115, and the needle portion 112a extends to the collection valve 111. When inserted into the hole 113 of the spool 114, the spool 114 comes into contact with the rear end surface 114g of the spool 114 to release the spool 114 in the axial direction, and as shown in FIG. A gap can be formed between the tapered portion 114e and the collar 115 to allow the liquid oil 104 to flow.

8, 9, and 10, the connection device 110 configured as described above connects the valve main body 111a of the collection valve 111 to Attach to collection port block 101 . In this attachment, the male screw portion 111d of the valve body 111a is screwed into the outlet side of the fluid passage 101a in the collecting port block 101 already attached to the oil reservoir container 103 and fixed. When the needle valve 112 is not connected to the collection valve 111, the spool 114 of the collection valve 111 is moved toward the collar 115 by the spring force of the coil spring 118, as shown in FIGS. The collar portion 114c is pressed against the end surface 115c of the collar 115, and the spool 114 is in a valve closed state in which the hole 113, which is the fluid passage, is closed between the collar 115 and the spool 114.

When collecting the liquid oil 104 in the oil reservoir container 103 into the oil collection container 102 for sampling, as shown in FIG. is inserted into the oil collection container 102, the needle portion 112a of the needle valve 112 is inserted into the valve body 111a of the collection valve 111 through the rear end hollow portion 113f and the central through hole 115a of the collar 115 in order. Further, when the needle portion 112a is inserted to a predetermined position, the tip of the needle portion 112a hits the rear end surface 114g of the pin-shaped portion 114d of the spool 114. As shown in FIG. When it is further inserted, the entire spool 114 is pushed toward the coil spring 118 by the tip of the needle portion 112a of the needle valve 112, as shown in FIG. Then, while the needle valve 112 compresses the coil spring 118, the spool 114 as a whole slides toward the coil spring 118 side, ie, toward the collection port block 101 side.

Further, as shown in FIG. 10, when the tapered portion 114e of the spool 114 is pulled out from the end face 115c of the collar 115 toward the collection port block 101, liquid oil is formed between the collar 115 and the tapered portion 114e. A gap is created through which 104 passes, and spool 114 in collection valve 111 is in a valve-open state. 10 shows a state in which the tapered portion 114e of the spool 114 protrudes from the end face 115c of the collar 115 toward the collection port block 101 by a distance S. There is a gap through which the liquid oil 104 flows.

10, the needle portion 112a is inserted into the collection valve 111 to open the spool 114 in the collection valve 111. When the valve is opened, the liquid oil 104 in the oil reservoir container 103 flows into the collection port block 101. Fluid passage 101a—small diameter cavity portion 113a of valve body 111a—first middle diameter cavity portion 113b—gap between inner peripheral surface of first middle diameter cavity portion 113b and notch portion 114f in spool 114—second The gap between the inner peripheral surface of the medium-diameter hollow portion 113c and the tip collar portion 114c of the spool 114-the gap between the collar 115 and the tapered portion 114e of the spool 114-the central through-hole (fluid passage) 115a of the collar 115- It flows into the tube 105 through the slot 121 of the needle portion 112a and the through hole (fluid passage) 120 of the needle portion 112a in this order. Also, from the tube 105 , the oil flows into the oil collection container 102 , and part of the liquid oil 104 in the oil reservoir container 103 can be sampled in the oil collection container 102 .

After a predetermined amount of oil has been collected in the oil collection container 102 , the needle portion 112 a of the needle valve 112 is pulled out from the collection valve 11 . When the needle valve 112 is withdrawn from the collection valve 111, the spool 114 is returned to the collar 115 side by the spring force of the coil spring 118 as it is withdrawn, and the distal end flange 114c comes into close contact with the end face 115c of the collar 115. , the valve returns to the closed state. This prevents the liquid oil 104 in the oil reservoir container 103 from leaking out through the collection valve 11 .

Therefore, in the connection device 110, when the needle portion 112a of the needle valve 112 is inserted into the collection valve 111 from the outside of the collection valve 111, part of the liquid oil 104 in the oil reservoir container 103 is sampled into the oil collection container 102. It is possible to check the degree of contamination of the liquid oil 104 in the oil reservoir container 103 and to perform component analysis on the part of the liquid oil 104 that has been taken out.

Japanese Utility Model Publication No. 4-26790

However, in the conventional connection device 110 shown in FIGS. 8 to 11, when the needle portion 112a of the needle valve 112 is inserted into the collection valve 111, a small hole on the collection valve 111 side, that is, the rear end hollow portion 113f, contains a Since the needle portion 112a having an outer diameter not much different from the inner diameter of the rear end hollow portion 113f is inserted, the positions of the axis O on the side of the collection valve 111 and the axis O on the side of the needle valve 112 are substantially aligned. However, it is difficult to match the position and the workability is poor.

Further, when sampling is performed by inserting the needle portion 112a of the needle valve 112 into the collection valve 111, as the amount of insertion increases, the gap between the spool 114 and the collar 115, that is, the opening amount increases. , the gap between spool 114 and collar 115 is reduced. Therefore, there is also the problem that the amount of insertion is not fixed each time, and the work time required for oil extraction is not fixed.

In addition, when the needle valve 112 is attached to and detached from the collection valve 111, there is also a problem that the finger gripping the grip portion 112b of the needle valve 112 is slippery, resulting in poor workability.

Therefore, in addition to facilitating the work of inserting the needle of the needle valve into the inside of the collection valve, the flow rate of the liquid oil is approximately constant and the time required for collection is obtained during oil collection, and the structure is realized at low cost. Therefore, a technical problem to be solved arises, and an object of the present invention is to solve this problem.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 comprises a collection valve and a needle valve for connecting a pair of fluid passage pipes in a freely attachable/detachable manner. a connection device for a fluid passage pipe, comprising: a fluid passage communicating with each other when said collection valve and said needle valve are connected; and an on-off valve mechanism which closes said fluid passage when said collection valve and said needle valve are disconnected from each other. The on-off valve mechanism includes a spool which is provided to open and close the fluid passage in the collection valve, and a spool which is provided so as to urge the spool in a closing direction to close the fluid passage. spring means inserted into the fluid passage of the collection valve to press the spool against the spring bias of the spring means when the collection valve and the needle valve are connected to each other; and a needle portion integrally provided with the needle valve so as to open the fluid passage in the valve, the needle valve being adapted to the collection valve when the collection valve and the needle valve are connected. By receiving the rear end portion, which is the connecting side outer peripheral portion, and contacting a tapered guide surface formed on the outer periphery of the rear end portion, the needle portion can be inserted into the fluid passage of the collection valve. The needle portion has a slit extending from the outer peripheral surface to the inside of the fluid passage at the tip portion in the direction in which the needle valve is inserted into the collection valve. It is an object of the present invention to provide a connection device for fluid passage pipes.

According to this configuration, when the needle portion of the needle valve is inserted into the collecting valve for connection to perform sampling of liquid oil, the connecting side outer peripheral portion of the collecting valve is received in the annular guide portion of the needle valve. Make the needle valve face the collection valve in such a way as to do. When the connection-side outer peripheral portion of the collection valve is received in the annular guide portion of the needle valve, the insertion port on the collection valve side and the needle portion of the needle valve are aligned substantially on the same axis and positioned relative to each other. Further, when the needle valve is further moved toward the collection valve in a state in which the insertion port of the collection valve and the needle portion of the needle valve are positioned, the needle portion of the needle valve is moved toward the collection valve along the axis, The needle part is smoothly inserted into the collection valve. Therefore, when inserting the needle part of the needle valve into the collection valve, the needle part can be smoothly inserted along the axis, so that the needle part of the needle valve can be inserted safely and reliably without putting a burden on the needle part. can be done.

In addition , when the needle part of the needle valve is inserted to a predetermined position in the collection valve in order to sample liquid oil, the liquid oil in the fluid passage tube on the side of the collection valve passes through the slit and flows into the fluid of the needle valve. It flows smoothly into the passage at a constant speed. This stabilizes the time required to collect the liquid oil.

According to a second aspect of the present invention, there is provided a connection device for a fluid passage tube in the structure according to the first aspect, wherein the needle valve has a shoulder portion that regulates the amount of insertion of the needle portion into the collection valve. offer.

According to this configuration, when the needle portion of the needle valve is inserted to a predetermined position in the sampling valve for sampling liquid oil, the needle portion is restricted by the shoulder portion and inserted to a position where it cannot be inserted any further. , that position is the predetermined insertion position. Therefore, by inserting the needle portion of the needle valve into the collecting valve to a position where it is regulated by the shoulder portion, an appropriate insertion amount can be obtained each time, and the working time for oil sampling can be stabilized.

According to a third aspect of the invention, there is provided a connection device for a fluid passage tube in the structure according to the first or second aspect, wherein the needle valve has a gripping portion formed with an anti-slip groove on the outer peripheral surface. offer.

According to this configuration, since the grasping portion having the groove for slip prevention is provided on the outer peripheral surface of the needle valve, the grasping portion can be easily grasped when attaching or detaching the needle valve to/from the collection valve. It can be attached and detached easily and reliably without slipping of fingers.

According to a fourth aspect of the present invention, there is provided a connection device for a fluid passage pipe, in the configuration according to any one of the first to third aspects, wherein the needle valve is made of a resin material.

According to this configuration, the needle valve can be easily manufactured by injection molding a resin material, and cost can be reduced.

According to the invention, the needle valve is provided with the annular guide portion, and when the needle portion of the needle valve is inserted into the collecting valve for sampling liquid oil, the connecting side outer peripheral portion of the collecting valve is first guided by the annular guide. The needle portion of the needle valve is inserted into the collection valve in a state in which the insertion port on the side of the collection valve and the needle portion of the needle valve are aligned substantially on the same axis and positioned with respect to each other. The needle part can be smoothly inserted into the collection valve. Therefore, when inserting the needle portion of the needle valve into the collection valve, the needle portion of the needle valve can be inserted safely and reliably without putting a burden on the needle portion of the needle valve, thereby simplifying the insertion work.

1 shows an embodiment of a connection device for a fluid passage tube according to an embodiment of the present invention, (a) is a side view of the same connection device showing a state in which the needle valve is removed from the collection valve, (b) the needle; A side view of the same connection device showing a state in which the valve is attached to the collection valve, (c) is a front view of the collection valve seen from the direction of line AA in (a), and (d) is (a ) is a front view of the needle valve viewed from the direction of the BB line. FIG. 2 is a cross-sectional view of the same connection device shown in FIG. 1, (a) is a vertical cross-sectional side view of the same connection device showing a state in which the needle valve is removed from the collection valve, and (b) is a needle valve attached to the collection valve. It is a longitudinal side view of the connecting device same as the above shown in a state where it is closed. FIG. 4 is a view for explaining the use of the connection device according to the embodiment of the present invention, showing a state before the needle valve is connected to the collection valve, with a part broken away. FIG. 4 is a view for explaining the use of the connection device according to the embodiment of the present invention, showing a state after the needle valve is connected to the collection valve, with a part broken away. FIG. 4 is an explanatory view showing an enlarged connection device according to the embodiment of the present invention, and is a view before the needle valve is connected to the collection valve. FIG. 4 is a view for explaining the use of the connection device according to the embodiment of the present invention, and is a cross-sectional view showing a state in the middle of connecting the needle valve to the collection valve. FIG. 4 is a view for explaining the use of the connection device according to the embodiment of the present invention, and is a cross-sectional view showing a state after connecting the needle valve to the collection valve. It is an explanatory view of a conventional connection device, and is a vertical cross-sectional view of the same connection device showing a state in which the needle valve is removed from the collection valve, with a part broken away. FIG. 10 is an explanatory view of a conventional connection device, and is a longitudinal cross-sectional view of the same connection device showing a partially cutaway state before the needle valve is connected to the collection valve. It is an explanatory view of a conventional connecting device, and is a vertical cross-sectional view of the connecting device showing a state after the needle valve is connected to the collection valve. Fig. 1 shows components in a conventional connection device, (a) is a side view of a spool in a needle valve used in a collection valve, (b) is a side view seen from the cc direction of (a), (c) is a vertical cross-sectional side view of the needle valve, and (d) is a side view seen from the cc direction of (c).

The present invention facilitates the work of inserting the needle of the needle valve into the inside of the collection valve, provides a substantially constant liquid oil flow rate and the time required for collection during oil collection, and provides a structure that can be realized at low cost. In order to achieve the object of providing a fluid passage tube, it comprises a collection valve and a needle valve for detachably connecting a pair of fluid passage tubes, wherein when the collection valve and the needle valve are connected, the fluid communicates with each other. A connection device for a fluid passage pipe, comprising a passage and an on-off valve mechanism that closes the fluid passage when the collection valve and the needle valve are disconnected from each other, wherein the on-off valve mechanism includes the A spool provided so as to open and close a fluid passage, a spring means provided so as to bias the spool in a direction in which the spool closes the fluid passage, and a connection between the collection valve and the needle valve. When inserted into the fluid passageway of the collection valve, the spool is pressed against the spring bias of the spring means to open the fluid passageway in the collection valve to the needle valve side. and a needle portion provided therein, wherein the needle valve receives a connection-side outer peripheral portion of the collection valve when the collection valve and the needle valve are connected, and is arranged in the fluid passage of the collection valve. It is realized by providing an annular guide portion on the outer circumference for guiding the insertion of the needle portion into the collecting valve substantially along the axis of the collection valve.

An example according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following examples, when referring to the number, numerical value, amount, range, etc. of constituent elements, unless otherwise specified or clearly limited to a specific number in principle, the specific number It is not limited, and may be more than or less than a specific number.

In addition, when referring to the shape or positional relationship of components, etc., unless otherwise specified or in principle clearly considered otherwise, etc. include.

In addition, the drawings may exaggerate characteristic parts by enlarging them in order to make the characteristics easier to understand. In addition, in cross-sectional views, hatching of some components may be omitted in order to facilitate understanding of the cross-sectional structure of the components.

Further, in the following description, expressions indicating directions such as up and down, left and right are not absolute, and are appropriate when each part of the connection device for fluid passage pipes according to the present invention is depicted. However, if the posture changes, it should be interpreted according to the change in posture. Also, the same reference numerals are given to the same elements throughout the description of the embodiments.

1 and 2 show a connection device 10 for fluid passage pipes (hereinafter simply referred to as "connection device 10") according to the present invention. Among them, (a) of FIG. 1 is a side view showing the needle valve 12 of the connecting device 10 in a state of being removed from the collection valve 11, and (b) of FIG. FIG. 1(c) is a front view of the collection valve 11 as seen from the direction of line AA in FIG. 1(a), and FIG. FIG. 2 is a front view of the needle valve 12 seen from the direction of line BB in FIG. 1(b); 2(a) is a vertical cross-sectional side view showing a state in which the needle valve 12 of the connection device 10 is removed from the collection valve 11, and FIG. 11 is a vertical cross-sectional side view shown in a state of being attached to 11. FIG.

3 to 7 are diagrams for explaining the use of the connection device 10 according to the present invention. Among them, FIG. 3 is a partially broken view showing a state before the needle valve 12 is connected to the collection valve 11, and FIG. 4 is a view after the needle valve 12 is connected to the collection valve 11. It is the figure which fracture|ruptures and shows a part in a state. 5 is an enlarged vertical cross-sectional side view showing a state before the needle valve 12 is connected to the collection valve 11, and FIG. 6 is an enlarged vertical cross-sectional view showing a state in the middle of connecting the needle valve 12 to the collection valve 11. It is a side view. FIG. 7 is an enlarged longitudinal side view showing a state after the needle valve 12 is connected to the collection valve 11. FIG.

1-7, a connection device 10 according to the present invention is provided between the collection port block 1 and the oil sampling vessel 2, as shown in FIGS. 3 and 4. FIG. The connection device 10 is used when periodically sampling liquid oil 4 such as hydraulic oil or engine oil stored in an oil reservoir container 3 such as a hydraulic oil tank or an oil pan.

The collection port block 1 shown in FIGS. 3 and 4 has a fluid passage 1a, and the inlet side of the fluid passage 1a is connected to the outlet of the oil reservoir container 3, and is always fixedly attached to the oil reservoir container 3. It is The liquid oil 4 in the oil reservoir container 3 is kept in a state of being constantly flowing into the fluid passage 1a of the collection port block 1. As shown in FIG.

A connection device 10 is arranged between the collection port block 1 and the oil collection vessel 2 . In addition, the connection device 10 is connected to a collection valve 11 functioning as a socket portion connected to the outlet side of the fluid passage 1a provided in the collection port block 1, and a tube 5 as a fluid passage on the side of the oil collection container 2. and a needle valve 12 functioning as a plug portion. The collection valve 11 and the needle valve 12 can be connected by detachably inserting the needle valve 12 as a plug into the collection valve 11 as a socket. The fluid passage 1a in the collection port block 1 and the tube 5, which are passages, are configured to be freely attachable/detachable to each other and connected.

Next, the structure of the connection device 10 will be described in detail. The collection valve 11 has a rod-shaped valve body 11a elongated in the axial direction (direction along the axis O). A hole 13 used as a fluid passage is formed substantially in the center of the valve main body 11a along the axis O of the valve main body 11a so as to penetrate the front and rear ends thereof.

Mainly referring to FIGS. 2, 5 and 6, the hole 13 of the valve body 11a is connected to the needle valve 12 from the base end portion 11b fixedly attached to the fluid passage 1a of the collection port block 1. Small-diameter cavity portion 13a, first intermediate-diameter cavity portion 13b, second intermediate-diameter cavity portion 13c, third intermediate-diameter cavity portion 13d, fourth cavity portion 13d, and fourth cavity portion 13d The medium-diameter hollow portion 13e and the rear end hollow portion 13f are formed in communication with each other. In addition, each of the small-diameter cavity portion 13a, the first intermediate-diameter cavity portion 13b, the second intermediate-diameter cavity portion 13c, the third intermediate-diameter cavity portion 13d, the fourth intermediate-diameter cavity portion 13e, and the rear end cavity portion 13f. The size of the inner diameter increases in the order of small-diameter hollow portion 13a, first medium-diameter hollow portion 13b, second medium-diameter hollow portion 13c, third medium-diameter hollow portion 13d, and fourth medium-diameter hollow portion 13e. However, the inner diameter of the rear end hollow portion 13f is slightly smaller than the inner diameter of the fourth medium-diameter hollow portion 13e. The outer peripheral surface of the base end portion 11b of the valve body 11a is fixed to the collection port block 1 by screwing it into a female thread formed on the inner peripheral surface of the collection port block 1 on the outlet side of the fluid passage 1a. A male threaded portion 11d is formed.

In the valve main body 11a, a coil spring 18 is accommodated and stretched along the axis O in the first medium-diameter cavity 13b, and the first medium-diameter cavity 13b and the second medium-diameter cavity 13b The spool 14 is housed and arranged so as to be movable along the axis O while straddling the hollow portion 13c and the third medium-diameter hollow portion 13d. An annular collar 15 is commonly contained in the third medium-diameter cavity 13d and the fourth medium-diameter cavity 113e and accommodated concentrically with the hole 13. As shown in FIG. Furthermore, when the collar 15 is housed in the third medium-diameter cavity 13d and the fourth medium-diameter cavity 13e, a gap is formed between the second medium-diameter cavity 13c and the third medium-diameter cavity 13d. The first O-ring 16 is accommodated in the gap between the circumferential stepped portion 13g and the collar 15 in the third medium-diameter cavity portion 13d, and the axial line of the collar 15 in the third medium-diameter cavity portion 13d. A first O-ring 16 regulates the movement in the direction along O. An O-ring positioning groove 15b is provided on the inner peripheral surface of the center through hole 15a of the collar 15. As shown in FIG. A second O-ring 17 having an inner diameter smaller than that of the collar 15 is positioned concentrically with the collar 15 and accommodated in the O-ring positioning groove 15b.

The spool 14 includes a rod-shaped spool main body 14a and a proximal flange 14b formed on the proximal end side of the spool main body 14a and having an outer diameter substantially equal to the inner diameter of the first medium-diameter hollow portion 13b. and a tip collar portion 14c formed on the front end side of the spool body 14a with an outer diameter smaller than the inner diameter of the second medium-diameter hollow portion 13c and larger than the inner diameter of the collar 15; A pin-shaped portion 14d projecting further forward from the center portion of the tip of the spool body 14a is integrally provided. The outer peripheral surface of the front portion 14e of the pin-shaped portion 14d (hereinafter referred to as "tapered portion 14e") is chamfered to form a tapered shape. In addition, cutouts 14f are provided in the left and right sides of the base end flange 14b of the spool 14, respectively. The cut-out amount of the cut-out portion 14f is such that the chord portion of the cut-out portion 14f is substantially flush with the outer peripheral surface of the spool body 14a. The shape of this spool 14 is formed in the same shape as the spool 114 shown in FIGS. 11(a) and 11(b).

In addition, when assembling the spool 14 to the valve main body 11a, as shown in FIG. 2, the tip collar portion 14c is positioned in contact with the end surface 15c of the collar 15, which is the so-called "valve closed position". The pin-shaped portion 14d is inserted through the first O-ring 16 into the central through-hole 15a of the collar 15. As shown in FIG. After that, the coil spring 18 is compressed and arranged in the first medium-diameter hollow portion 13b, and then the compression of the coil spring 18 is released. The spring force of the coil spring 18 presses the spool 14 toward the collar 15, bringing the tip flange 14c of the spool 14 and the end face 15c of the collar 15 into close contact with each other to establish a sealed state, that is, a valve closed state. to hold the spool 14 in the "valve closed position".

The spool 14, which is pressed against the end surface 15c of the collar 15 by the spring force of the coil spring 18 and tightly arranged with the end surface 15c of the collar 15 in the valve closed position, is externally connected to the needle portion 12a of the needle valve 12. is inserted into the valve body 11a through the rear end hollow portion 13f and the central through hole 15a of the collar 15, and when the tip of the needle portion 12a is pushed toward the coil spring 18, the coil spring 18 is spring-compressed, The spool 14 is slid toward the base end portion 11b of the valve body 11a. The movement here is up to the "valve open position" where the base of the chamfered tapered portion 14e of the pin-shaped portion 14d exits the central through-hole 15a of the collar 15, that is, the distance S shown in FIG. 2(b). A gap is formed between the central through hole 15a of the collar 15 and the tapered portion 14e of the pin-shaped portion 14d of the spool 14 to allow the liquid oil 4 to pass therethrough. is released, and the collection valve 11 can be opened.

The needle valve 12 is made of resin and formed by injection molding or the like. Further, as shown in FIGS. 1 to 7, the needle valve 12 is provided with a gripping portion 12b having a circular flange shape in the intermediate portion, and is provided concentrically with the gripping portion 12b on the front and rear sides of the gripping portion 12b. A pin-shaped needle portion 12a, a connecting portion 12c, and an annular guide portion 12d formed between the base portion of the needle portion 12a and the grip portion 12b are integrally provided.

The annular guide portion 12d is composed of a disk-shaped bottom portion 12da that extends outward from the outer peripheral surface of the needle portion 12a adjacent to the grip portion 12b, and extends from the outer periphery of the bottom portion 12da to the tip of the needle portion 12a. The needle part 12a is formed in a cup-like shape with an opening at the tip side thereof, integrally having a cylindrical part 12db formed perpendicularly to the side. A disc-shaped shoulder portion 23 is formed integrally with the inner surface of the bottom portion 12da of the annular guide portion 12d by expanding the central portion of the bottom portion 12da toward the opening side. The outer diameter of the shoulder portion 23 is slightly larger than the inner diameter of the fourth medium-diameter hollow portion 13 e provided in the collection valve 11 . When the needle portion 12a is pushed toward the valve body 11a, the shoulder portion 23 prevents the bottom portion 12da from entering the fourth medium-diameter hollow portion 13e, but abuts against the rear surface 11c and prevents further entry. It is configured to be

Further, as shown in FIG. 2, the inner diameter D1 of the annular guide portion 12d is equal to or slightly larger than the outer diameter D2 of the rear end side of the valve body 11a, that is, D1≧D2. is formed by Further, the annular guide portion 12d is formed to protrude by a distance L2 larger than the distance L1 of the protrusion of the needle portion 12a. The outer periphery of the rear end portion 11A of the valve body 11a which is inserted and accommodated in the annular guide portion 12d is tapered toward the rear end side for guiding the reception of the rear end portion 11A of the valve body 11a. A tapered guide surface 11e having a shape is formed over the entire circumference.

Further, a through hole 20 is provided at the center of the axis of the needle valve 12 so as to pass through the needle portion 12a, the grip portion 12b, and the connecting portion 12c in the front-rear direction along the axis O. As shown in FIG. A slit-like slit 21 is formed at the tip of the needle portion 12a and communicates with the through hole 20 cut from the tip surface of the needle portion 12a toward the bottom portion 12da of the annular guide portion 12d.

The outer diameter of the needle portion 12 a of the needle valve 12 is slightly smaller than the inner diameter of the spool 14 and slightly larger than the inner diameter of the second O-ring 17 . The needle portion 12a is tightly inserted into the center through hole 15a of the collar 15 while expanding the second O-ring 17. As shown in FIG. In addition, the axial length L1 (see FIG. 2) of the needle portion 12a extends from the outside of the collection valve 11 through the rear end hollow portion 13f and the central through hole 15a of the collar 15 to extend the needle portion 12a to the collection valve 11. 2, the tip flange 14c of the spool 14 is pressed against the end face 15c of the collar 15 as shown in FIG. 2(b). , a gap can be formed between the tapered portion 114e and the collar 15 to allow the liquid oil 4 to flow. The needle valve 12 is inserted into the collection valve 11 so that the opening of the spool 14 is maximized when the position regulating surface 23a of the shoulder portion 23 of the needle valve 12 contacts the rear surface 11c of the collection valve 11. is set.

The grasping portion 12b of the needle valve 12 is provided along the axis O between the annular guide portion 12d and the connecting portion 12c integrally with the annular guiding portion 12d and the connecting portion 12c. The outer diameter of the gripping portion 12b is smaller than the outer diameter of the annular guide portion 12d and larger than the outer diameter of the connecting portion 12c. A plurality of (two in the embodiment) annular grooves 24 for prevention are provided. The annular groove 24 forms unevenness on the outer peripheral surface of the annular groove 24 when the needle valve 12 is moved along the axis O with respect to the valve body 11a of the collection valve 11 by pinching the grip portion 12b with fingers to perform an attachment/detachment operation. are formed, and the unevenness prevents fingers from slipping on the grip portion 12b. Therefore, if the annular groove 24 can prevent the finger from slipping, it may be formed in a diamond-shaped groove, for example, instead of the annular groove 24 .

The connection device 10 configured as described above is configured such that when the collection valve 11 and the needle valve 12 are not connected, the valve of the collection valve 11 is opened as shown in FIGS. The body 11a is attached to the collection port block 1 on the fixed side. In this attachment, the externally threaded portion 11d of the valve body 11a is screwed and fixed to the outlet side of the fluid passage 1a in the collecting port block 1 already attached to the oil reservoir container 3. As shown in FIG. When the needle valve 12 is not connected to the collection valve 11, the collection valve 11 is arranged such that the spool 14 is pulled by the spring force of the coil spring 18 to the collar 15 side as shown in FIGS. , the tip flange 14c is pressed against the end face 15c of the collar 15, and the spool 14 is in a valve-closed state in which the hole 13, which is a fluid passage, is closed between the collar 15 and the spool 14.

When collecting the liquid oil 4 in the oil reservoir container 3 into the oil collection container 2 for sampling, as shown in FIGS. 5 is inserted into the oil collecting container 2, the needle portion 12a of the movable needle valve 12 is inserted into the rear end hollow portion 13f. In this inserting operation, prior to inserting, first, as shown in FIG. 6, the rear end portion 11A of the valve body 11a is inserted into the annular guide portion 12d and accommodated. When the rear end portion 11A of the valve main body 11a is inserted into the annular guide portion 12d, the rear end portion 11A of the rear end portion 11A is formed with a tapered guide surface 11e along the entire circumference. The rear end portion 11A of 11a is guided by the tapered guide surface 11e and smoothly inserted into the annular guide portion 12d. Further, when the rear end portion 11A of the valve main body 11a is inserted into the annular guide portion 12d and accommodated, the collection valve 11 and the needle valve 12 are arranged opposite to each other with the axes O aligned with each other.

When the collection valve 11 and the needle valve 12 are arranged opposite to each other with the axis O aligned, when the needle valve 12 is pushed further toward the collection valve 11, the needle portion 12a of the needle valve 12 moves along the axis O. It is inserted into the valve main body 11a of the collection valve 11 through the rear end hollow portion 13f and the central through hole 15a of the collar 15 in this order. Further, when the needle portion 12a is inserted to a predetermined position, the tip of the needle portion 12a abuts against the tip surface 14g of the pin-shaped portion 14d of the spool 14. As shown in FIG. Further, when it is further inserted, the entire spool 14 is pushed toward the coil spring 118 by the tip of the needle portion 12 a of the needle valve 12 . Then, while the needle valve 12 compresses the coil spring 18 , the entire spool 14 slides toward the coil spring 18 side, that is, toward the collection port block 1 side. FIG. 6 shows the state during the movement.

Further, when the tapered portion 14e of the spool 14 is pulled out from the end face 15c of the collar 15 toward the collection port block 101, a gap through which the liquid oil 4 passes is created between the collar 15 and the tapered portion 14e. , the spool 14 in the collection valve 11 is opened. 4 and 7, when the shoulder portion 23 of the needle portion 12a contacts the rear surface 11c of the valve body 11a, further movement of the needle valve 12 is restricted. Also, when the shoulder 23 abuts the rear surface 11c, the tapered portion 14e of the spool 14 is pulled from the end surface 15c of the collar 15 to the collection port block, as shown in FIGS. In this state, the maximum gap through which the liquid oil 104 flows is created between the collar 15 and the tapered portion 14e, and the valve opening amount of the collection valve 11 is maximized. .

2B, 4, and 7, the needle portion 12a of the needle valve 12 is inserted into the collection valve 11, and the movement of the spool 14 in the collection valve 11 causes the collection valve 11 to move. When the valve is opened, the liquid oil 4 in the oil reservoir container 3 flows through the fluid passage 1a of the collection port block 1, the small-diameter cavity 13a of the valve body 11a, the first medium-diameter cavity 13b, and the first medium-diameter cavity 13b. The gap between the inner peripheral surface of the spool 14 and the notch 14f of the spool 14 - The gap between the inner peripheral surface of the second medium-diameter hollow portion 13c and the tip collar 14c of the spool 14 - The tapered shape of the collar 15 and the spool 14 The liquid flows into the tube 5 through the gap between the portions 14e, the central through hole (fluid passage) 15a of the collar 15, the slit 21 of the needle portion 12a, and the through hole (fluid passage) 20 of the needle portion 12a. Further, from the tube 5, it flows into the oil collection container 2 shown in FIG.

After a predetermined amount of oil has been collected in the oil collection container 2 , the needle portion 12 a of the needle valve 12 is pulled out from the collection valve 11 . When the needle valve 12 is withdrawn from the sampling valve 11, the spool 14 is returned to the collar 15 side by the spring force of the coil spring 18 as it is withdrawn, and the distal end flange 14c is in close contact with the end surface 15c of the collar 15. , the valve returns to the closed state. This prevents the liquid oil 4 in the oil reservoir container 3 from leaking out through the collection valve 11 . As described above, in the connection device 10, when the needle portion 12a of the needle valve 12 is inserted into the collection valve 11 from the outside of the collection valve 11, a part of the liquid oil 4 in the oil reservoir container 3 is sampled and 2, and from part of the liquid oil 4 taken out, it is possible to check the degree of contamination of the liquid oil 4 in the oil reservoir container 3 and to perform component analysis.

Therefore, according to the configuration of the connection device 10 of the present embodiment, the needle valve 12 is provided with the annular guide portion 12d, and the needle portion 12a of the needle valve 12 is inserted into the collection valve 11 when sampling the liquid oil 4 or the like. , the connecting side outer peripheral portion (rear end portion 11A) of the collection valve 11 is received in the annular guide portion 12d of the needle valve 12, and the insertion port on the side of the collection valve 11 and the needle portion 12a of the needle valve 12 are connected. The needle portion 12a of the needle valve 12 is inserted into the collection valve 11 in a state in which the axes O are aligned and arranged in a straight line, and the needle portions 12a are inserted into the collection valve 11 in a mutually positioned state. be able to. As a result, when inserting the needle portion 12a of the needle valve 12 into the collection valve 11, the needle portion 12a of the needle valve 12 can be inserted safely and reliably without putting a burden on the needle portion 12a, thereby simplifying the work. I can plan. In this embodiment, the annular guide portion 12d is formed in a cup shape with the tip side of the needle portion 12a being open. As long as it can receive the end portion 11A, it may be, for example, a spirally wound cylindrical portion.

A through hole 20 forming a part of the fluid passage pipe is provided approximately in the center of the needle portion 12a of the needle valve 12, and the tip portion on the insertion side extends from the outer peripheral surface to the inside of the through hole 20, which is the fluid passage. Since the elongated slit 21 is provided, when the needle portion 12a of the needle valve 12 is inserted to a predetermined position in the collection valve 11 for sampling the liquid oil 4, the collection valve is opened. Since the liquid oil 4 in the fluid passage pipe (hole 13) on the 11 side smoothly flows into the fluid passage of the needle valve 12 through the slot 21 at a constant speed, the time required for collecting the liquid oil 4 is reduced. can be stabilized.

Further, a shoulder portion 23 is provided between the rear surface 11c of the valve main body 11a of the collection valve 11 and the inner surface of the annular guide portion 12d of the needle valve 12 to regulate the amount of insertion of the needle portion 12a into the collection valve 11. When connecting the collection valve 11 and the needle valve 12, the valve body 11a may be inserted into the annular guide portion 12d until the rear surface 11c of the valve body 11a and the shoulder portion 23 of the needle valve 12 come into contact with each other. That is, since the amount to be inserted is always constant, the amount to be inserted at the time of connection is stabilized. This stabilizes the collection time of the liquid oil 4 .

Further, since the grasping portion 12b having the groove 24 for slip prevention is provided on the outer peripheral surface of the needle valve 12, the grasping portion 12b can be grasped when the needle valve 12 is attached to or detached from the collection valve 11. You can prevent your fingers from slipping, and you can securely attach and detach.

In addition, since the needle valve 12 is made of a resin material, the needle valve 12 can be easily manufactured by injection molding or the like, and the cost can be reduced.

It should be noted that the present invention can be modified in various ways without departing from the spirit of the present invention, and the present invention naturally extends to such modifications. For example, in the above-described embodiment, a structure is disclosed in which the position of the collection valve 11 is fixed and the needle valve 12 is movably arranged. A structure in which they are arranged freely may be used.

Reference Signs List 1: Collection port block 1a: Fluid passage 2: Oil collection container 3: Oil reservoir container 4: Liquid oil 5: Tube 10: Connection device 11: Collection valve 11A: Rear end 11a: Valve body 11b: Base end 11c: Rear surface 11d: Male screw portion 11e: Taper guide surface 12: Needle valve 12a: Needle portion 12b: Grip portion 12c: Connecting portion 12d: Annular guide portion 12da: Bottom portion 12db: Cylindrical portion 13: Hole 13a: Small diameter hollow portion 13b: First Middle-diameter hollow portion 13c: Second middle-diameter hollow portion 13d: Third middle-diameter hollow portion 13e: Fourth middle-diameter hollow portion 13f: Rear end hollow portion 13g: Round stepped portion 14: Spool 14a: Spool main body 14b : base end flange 14c : tip flange 14d : pin-shaped portion 14e : portion 14f : notch 14g : tip end surface 15 : collar 15a : center through hole 15b : O-ring positioning groove 15c : end surface 16 : first O-ring 17: Second O-ring 18: Coil spring 20: Through hole 21: Slot (slit)
23: Shoulder 23a: Position regulating surface 24: Groove L1: Distance L2: Distance O: Axis S: Distance

Claims (4)

A collection valve and a needle valve are provided for connecting a pair of fluid passage tubes in a detachable manner, and when the collection valve and the needle valve are connected, the fluid passage communicates with the collection valve and the needle valve. A connection device for a fluid passage pipe, which is provided with an on-off valve mechanism that closes the fluid passage when the connection with
The on-off valve mechanism is
a spool configured to open and close the fluid passage in the collection valve;
spring means provided to urge the spool in a closing direction in which the spool closes the fluid passage;
When the collection valve and the needle valve are connected, a needle is inserted into the fluid passageway of the collection valve to press the spool against the spring bias of the spring means, and to press the fluid passageway in the collection valve. a needle part integrally provided with the needle valve so as to open the
When the collection valve and the needle valve are connected, the needle valve receives the rear end of the collection valve, which is the connection-side outer circumference of the collection valve. an annular guide portion that guides the insertion of the needle portion into the fluid passage of the collection valve by contact along the substantially axial center of the collection valve ;
A connecting device for a fluid passage tube, wherein the needle portion has a slit extending from an outer peripheral surface to the inside of the fluid passage at a tip end portion in a direction in which the needle valve is inserted into the collection valve. 2. The device for connecting a fluid passage tube according to claim 1 , wherein the needle valve has a shoulder portion that regulates the amount of insertion of the needle portion into the collection valve. 3. The device for connecting fluid passage pipes according to claim 1 , wherein said needle valve has a grasping portion having a non-slip groove formed on an outer peripheral surface thereof. 4. A connection device for a fluid passage tube according to claim 1 , wherein said needle valve is made of a resin material.

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