JP2021028526A - Connecting device of fluid passage pipe - Google Patents

Abstract

To provide a connecting device of a fluid passage pipe which facilitates work for inserting a needle of a needle valve into a collection valve, can obtain a substantially-constant flow speed of liquid oil at oil collection, also can obtain a time necessary for the collection, and has a structure which is obtainable at a low cost.SOLUTION: An annular guide part 12d for accommodating a rear end part 11c of a collection valve 11 is arranged at a needle valve 12, and when sampling liquid oil, the annular guide part 12d of the needle valve is made to accept a connection-side external peripheral portion of the collection valve 11 therein firstly, the collection valve 11 and the needle valve 12 are aligned on the same axial line O, the needle valve 12 is thereby further moved to the collection valve 11 side in a state that an insertion port at the collection valve 11 side and the needle valve 12 are positioned, thus making a needle part 12a of the needle valve 12 smoothly inserted into the collection valve 11 along an axial line O.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fluid passage pipe connecting device, and more particularly to a fluid passage pipe connecting device including a collection valve and a needle valve for attaching and detaching a pair of fluid passage pipes. ..

It is known that construction machinery and the like drive a hydraulic pump using an engine and perform various operations and operations using the hydraulic pressure obtained by driving the hydraulic pump. For this reason, construction machinery is equipped with a hydraulic oil tank for storing hydraulic oil, and the engine is equipped with an oil pan for storing engine oil.

By the way, in construction machinery and the like, dirt and deterioration of components of hydraulic oil and engine oil gradually occur with time of use, and if left untreated, there is a risk of damage to hydraulic equipment and engine.

Therefore, it is necessary to periodically sample hydraulic oil and engine oil to check the degree of dirt 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 in the construction machine, it is installed / removed between the hydraulic oil tank or the oil pan and the sampling container. A method is known in which a possible fluid passage pipe connecting device is provided and hydraulic oil or engine oil is sampled through the fluid passage pipe connecting device (see, for example, Patent Document 1).

The connecting device described in Patent Document 1 includes a socket portion and a plug portion provided at an end portion of each fluid passage pipe in order to attach and detach a pair of fluid pipelines. Further, a valve having a fluid passage that communicates with each other is provided inside the socket portion and the plug portion, and a spherical valve body that opens and closes the fluid passage by the spring force of the coil spring is provided in the fluid passage of the socket portion. It is configured to include a mechanism and ribs provided in the direction of the fluid passage to guide the movement of the valve body 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 incorporated, there is a problem that the structure becomes complicated. ..

Therefore, for example, as shown in FIG. 8, a connecting device 110 is provided between the collecting port block 101 and the oil collecting container 102, and the connecting device 110 is used in an oil storage container 103 such as a hydraulic oil tank or an oil pan. A method of periodically sampling a liquid oil 104 such as a hydraulic oil or an engine oil is known.

More specifically, the collection port block 101 has a fluid passage 101a, and is always fixedly attached to the oil reservoir 103 with the inlet side of the fluid passage 101a connected to the outlet of the oil reservoir 103. There is. Then, the liquid oil 104 in the oil storage container 103 is always held in a state of flowing into the fluid passage 101a of the collection port block 101.

The connecting device 110 is arranged between the collection port block 101 and the oil collection container 102. Further, the connecting 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 to which the tube 105 which is the fluid passage on the oil collection container 102 side is connected. , Is equipped. The collection valve 111 and the needle valve 112 can be detachably connected to each other, and by connecting and disconnecting the collection valve 111, the fluid passage 101a and the tube 105 in the collection port block 101, which are a pair of fluid passages, can be attached to and detached from each other. It is configured so that it can be connected.

9 and 10 are enlarged cross-sectional views showing in detail the internal structure of the connecting device 110, FIG. 9 shows the collection valve 111 and the needle valve 112 with the connection removed, and FIG. 10 shows the collection valve 111. It is shown in a connected state in which the needle valve 112 is attached to the valve 111.

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

The hole 113 of the valve body 111a will be described mainly using the drawing of FIG. 9, and is a rear end portion connected to the needle valve 112 from the tip end portion 111b side fixedly attached to the fluid passage 101a of the collection port block 101. In order toward the 111c side, the small diameter cavity 113a, the first medium diameter cavity 113b, the second medium diameter cavity 113c, the third medium diameter cavity 113d, the fourth medium diameter cavity 113e, and The rear end cavity portion 113f is formed in a state of communicating with each other. Each of the small diameter cavity 113a, the first medium diameter cavity 113b, the second medium diameter cavity 113c, the third medium diameter cavity 113d, the fourth medium diameter cavity 113e, and the rear end cavity 113f. The size of the inner diameter is larger in the order of the small diameter cavity 113a, the first medium diameter cavity 113b, the second medium diameter cavity 113c, the third medium diameter cavity 113d, and the fourth medium diameter cavity 113e. However, the size of the inner diameter of the rear end cavity portion 113f is formed to be slightly smaller than the size of the inner diameter of the fourth medium diameter cavity portion 113e. Further, on the outer peripheral surface of the tip end portion 111b of the valve body 111a, it is screwed into a female screw formed on the inner peripheral surface of the fluid passage 101a on the outlet side of the collection port block 101 and fixed to the collection port block 101. , The male screw portion 111d is formed.

Then, in the valve body 111a, the coil spring 118 is flexibly accommodated and arranged along the axis O in the first medium diameter cavity 113b, and the first medium diameter cavity 113b and the second medium diameter are accommodated and arranged. The spool 114 is movably housed and arranged along the axis O in a state where the cavity portion 113c and the third medium-diameter cavity portion 113d are commonly straddled. Further, an annular collar 115 is commonly contained inside the third medium-diameter cavity portion 113d and the fourth medium-diameter cavity portion 113e, and is concentrically accommodated with the hole 113. Further, when the collar 115 is housed and arranged in the third medium-diameter cavity 113d and the fourth medium-diameter cavity 113e, it is formed between the second medium-diameter cavity 113c and the third medium-diameter cavity 113d. The first O-ring 116 is accommodated and arranged in the gap between the circumferential step portion 113g and the collar 115 in the third medium-diameter cavity portion 113d, and the axis of the collar 115 in the third medium-diameter cavity portion 113d. The movement in the direction along the O is regulated by the first O-ring 116. An O-ring positioning groove 115b is provided on the inner peripheral surface of the central through hole 115a in the collar 115. In the O-ring positioning groove 115b, a second O-ring 117 having an inner diameter smaller than the size of the inner diameter of the collar 115 is concentrically positioned and accommodated with the collar 115.

As shown in FIGS. 11A and 11B, the spool 114 is substantially equal to the size of the inner diameter of the rod-shaped spool body 114a and the inner diameter of the first medium-diameter cavity 113b on the proximal end side of the spool body 114a. The base end collar portion 114b formed with the size of the outer diameter and the front end side of the spool body 114a are smaller than the size of the inner diameter of the second medium diameter cavity portion 113c and larger than the size of the inner diameter of the collar 15. It integrally has a tip flange portion 114c formed with a large outer diameter and a pin-shaped portion 114d protruding further from the center of the tip of the spool body 114a toward the front of the spool body 114a. The outer peripheral surface of the front portion 114e of the pin-shaped portion 114d (hereinafter, this portion is referred to as a "tapered portion 114e") is chamfered to form a tapered portion. Further, the left and right side portions of the base end flange portion 114b of the spool 114 are provided with notches 114f, which are notched in a substantially half-moon shape. The notch amount of the notch portion 114f is cut out until the portion of the notch portion 114f that becomes the chord is substantially flush with the outer peripheral surface of the spool main body 114a.

Further, in assembling the spool 114 to the valve body 111a, as shown in FIGS. 8, 9, and 10, the tip flange portion 114c is positioned in contact with the end surface 115c of the collar 115, that is, the so-called “valve closing position”. The pin-shaped portion 114d is inserted into the central through hole 115a of the collar 115 through the first O-ring 116. After that, the coil spring 118 is compressed and arranged in the second medium-diameter cavity portion 113c, and then the compression of the coil spring 118 is released. Then, the spool 114 is pressed against the collar 115 by the spring force of the coil spring 118, and the tip flange portion 114c of the spool 114 and the end face 115c of the collar 115 are brought into close contact with each other to bring them into a sealed state, that is, a valve closed state. The spool 114 is held in the "valve closed position".

The spool 114, which is pressed against the end face 115c of the collar 115 by the spring force of the coil spring 118 and is closely arranged with the end face 115c of the collar 115 at the valve closed position, is a needle portion 112a of the needle valve 112 from the outside. Is inserted into the valve body 111a through the rear end cavity portion 113f and the central through hole 115a of the collar 115, and is pushed toward the coil spring 118 by the tip of the needle portion 112a, the coil spring 118 is spring-compressed and spooled. The 114 is slid to the tip 111b side of the valve body 111a. The movement here is such that the base of the chamfered tapered portion 114e in the pin-shaped portion 114d is released to the "valve opening position" where the base of the chamfered tapered portion 114e exits from the central through hole 115a of the collar 115, that is, 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 so that the liquid oil 104 can pass therethrough, and the sealing state between the spool 114 and the collar 115 is maintained. Once unraveled, the collection valve 111 can be opened.

As shown in FIGS. 8, 9, 10 and 11 (c) and 11 (d), the needle valve 112 is provided with a circular brim-shaped grip portion 112b in the intermediate portion, and is provided in front of and behind the grip portion 112b. Each of the pin-shaped needle portion 112a and the connecting portion 112c provided concentrically with the grip portion 112b are integrally provided. Further, at the center of the axis of the needle valve 112, a through hole 120 is provided that penetrates the needle portion 112a, the grip portion 112b, and the connecting portion 112c in the front-rear direction along the axis O. Further, a slit-shaped slit 121 that is cut from the tip surface of the needle portion 112a toward the grip portion 112b and leads into the through hole 120 is formed at the tip portion of the needle portion 112a.

The size of the outer diameter of the needle portion 112a in the needle valve 112 is formed to be slightly smaller than the size of the inner diameter of the spool 114 and slightly larger than the size of the inner diameter of the second O-ring 117. Then, the needle portion 112a is densely inserted into the central through hole 115a of the collar 115 while expanding the second O-ring 117. Further, the axial length L1 (see FIG. 9) of the needle portion 112a passes through the rear end cavity portion 113f and the central through hole 115a of the collar 115 from the outside of the collection valve 111, and the needle portion 112a is collected valve 111. When the spool 114 is inserted into the hole 113, the spool 114 comes into contact with the rear end surface 114g of the spool 114 to escape in the axial direction, and the tip flange portion 114c of the spool 114 is separated from the end surface 115c of the collar 115 as shown in FIG. A gap through which the liquid oil 104 flows can be formed between the tapered portion 114e and the collar 115.

Then, in the connecting device 110 configured in this way, in a state where the collection valve 111 and the needle valve 112 are not connected, as shown in FIGS. 8, 9, and 10, the valve body 111a of the collection valve 111 is connected. Attached to the collection port block 101. In this installation, the male screw portion 111d of the valve body 111a is screwed and fixed to the outlet side of the fluid passage 101a in the collection port block 101 already attached to the oil storage container 103. When the needle valve 112 is not connected to the collection valve 111, the spool 114 is moved to the collar 115 side by the spring force of the coil spring 118, and the tip of the collection valve 111 is moved to the collar 115 side as shown in FIGS. 8 and 9. The collar 114c is pressed against the end face 115c of the collar 115, and the spool 114 is in a valve closed state between the collar 115 and the spool 114, that is, the hole 113 which is a fluid passage is closed.

Then, when the liquid oil 104 in the oil storage container 103 is collected in the oil collection container 102 for sampling, as shown in FIG. 8, the end of the tube 122 connected to the connecting portion 112c of the needle valve 112 Is inserted into the oil collection container 102, and the needle portion 112a of the needle valve 112 is sequentially inserted into the valve body 111a of the collection valve 111 through the rear end cavity portion 113f and the central through hole 115a of the collar 115. Further, when the needle portion 112a is inserted to a predetermined position, the tip of the needle portion 112a abuts on the rear end surface 114g of the pin-shaped portion 114d of the spool 114. Further, when further inserted, as shown in FIG. 10, the entire spool 114 is pushed toward the coil spring 118 by the tip of the needle portion 112a of the needle valve 112. Then, the needle valve 112 slides the entire spool 114 toward the coil spring 118 side, that is, the collection port block 101 side while compressing the coil spring 118.

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 for the 104 to pass through, and the spool 114 in the collection valve 111 is opened. Note that FIG. 10 shows a state in which the tapered portion 114e of the spool 114 is extracted from the end surface 115c of the collar 115 toward the collection port block 101 by a distance S, and is between the collar 115 and the tapered portion 114e. There is a gap through which the liquid oil 104 flows.

Then, as shown in FIG. 10, when the needle portion 112a is inserted into the collection valve 111 and the spool 114 in the collection valve 111 is opened, the liquid oil 104 in the oil storage container 103 becomes the collection port block 101. Fluid passage 101a-Small diameter cavity 113a of valve body 111a-First medium diameter cavity 113b-Gap between the inner peripheral surface of the first medium diameter cavity 113b and notch 114f in the spool 114-Second Gap between the inner peripheral surface of the medium-diameter cavity 113c and the tip flange 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 through hole (fluid passage) 120 of the needle portion 112a and the through hole (fluid passage) 120 of the needle portion 112a in order. Further, the oil flows from the tube 105 into the oil collection container 102, and a part of the liquid oil 104 in the oil storage container 103 can be sampled in the oil collection container 102.

When a predetermined amount of oil has been collected in the oil collection container 102, the needle portion 112a of the needle valve 112 is pulled out from the collection valve 11. When the needle valve 112 is pulled out from the collection valve 111, the spool 114 is returned to the collar 115 side by the spring force of the coil spring 118 along with the pulling out, and the tip flange portion 114c comes into close contact with the end face 115c of the collar 115. , Returns to the valve closed state. As a result, the liquid oil 104 in the oil storage container 103 is prevented from leaking to the outside through the collection valve 11.

Therefore, in this 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, a part of the liquid oil 104 in the oil storage container 103 is sampled into the oil collection container 102. From a part of the liquid oil 104 taken out and taken out, it is possible to check the degree of dirtiness of the liquid oil 104 in the oil storage container 103 and analyze the components.

Jikken 4-26790 Gazette

However, in the conventional connecting 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, it is inserted into the rear end cavity portion 113f, which is a small hole on the collection valve 111 side. Since the needle portion 112a having an outer diameter that is not so different from the inner diameter of the rear end cavity portion 113f is inserted, the positions of the axis O on the collection valve 111 side and the axis O on the needle valve 112 side are substantially aligned with each other. It is necessary to insert it in the state where it is made to fit, but there is a problem that it is difficult to match the positions and workability is poor.

Further, when the needle portion 112a of the needle valve 112 is inserted into the collection valve 111 for sampling, if the insertion amount is large, the gap between the spool 114 and the collar 115, that is, the opening amount is large, and conversely, the insertion amount is large. If the amount is small, the gap between the spool 114 and the collar 115 becomes small. Therefore, there is also a problem that the amount of insertion is not determined each time and the working time required for oil extraction is not determined.

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

Therefore, in order to facilitate the work of inserting the needle of the needle valve inside the collection valve, to obtain a substantially constant flow rate of liquid oil at the time of oil collection and the time required for collection, and to make the structure feasible at low cost. 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 includes a collecting valve and a needle valve for attaching and detaching a pair of fluid passage pipes. A fluid passage pipe connecting device provided with a fluid passage that communicates with each other when the collection valve and the needle valve are connected, and an on-off valve mechanism that closes the fluid passage when the connection between the collection valve and the needle valve is disconnected. The on-off valve mechanism is provided so as to urge the spool so that the fluid passage in the collection valve can be opened and closed and the spool in the closing direction in which the spool closes the fluid passage. When the spring means is connected to the collection valve and the needle valve, the spool is inserted into the fluid passage of the collection valve and presses the spool against the spring urging of the spring means to collect the fluid. A needle portion provided on the needle valve side so as to open the fluid passage in the valve is provided, and the needle valve is connected to the collection valve when the collection valve and the needle valve are connected. A fluid passage pipe connecting device having an annular guide portion on the outer periphery that receives the side outer peripheral portion and guides the insertion of the needle portion into the fluid passage of the collection valve along the substantially axial center of the collection valve. To provide.

According to this configuration, when the needle part of the needle valve is inserted into the collection valve and connected to sample liquid oil or the like, the outer peripheral portion on the connecting side of the collection valve is received in the annular guide part of the needle valve. The needle valve is brought to face the collection valve. When the outer peripheral portion of the collecting valve on the connecting side is received in the annular guide portion of the needle valve, the insertion port on the collecting valve side and the needle portion of the needle valve are aligned on substantially the same axis and positioned with each other. Further, when the needle valve is further moved to the collection valve side while the insertion port on the collection valve side and the needle part of the needle valve are positioned, the needle part of the needle valve is moved to the collection valve side along the axis line. The needle part is smoothly inserted into the collection valve. Therefore, when the needle part of the needle valve is inserted into the collection valve, the needle part can be smoothly inserted along the axis line, so that the needle part of the needle valve can be inserted safely and securely without imposing a burden on the needle part. Can be done.

The invention according to claim 2 is the configuration according to claim 1, wherein the needle portion is provided with a slit extending from an outer peripheral surface to the inside of the fluid passage at a tip portion on the insertion side. Provide a connecting device.

According to this configuration, when the needle part of the needle valve is inserted to a predetermined position in the collection valve in order to sample the liquid oil, the liquid oil in the fluid passage pipe on the collection valve side passes through the slit. It flows smoothly into the fluid passage of the needle valve at a constant speed. As a result, the time required for collecting the liquid oil is stabilized.

The invention according to claim 3 is the connection of a fluid passage pipe in the configuration according to claim 1 or 2, wherein the needle valve includes a shoulder portion that regulates the insertion amount of the needle portion into the collection valve. Provide the device.

According to this configuration, when the needle part of the needle valve is inserted to a predetermined position in the collection valve in order to sample liquid oil or the like, it is inserted to a position where it is restricted by the shoulder part and cannot be inserted any more. , That position becomes a predetermined insertion position. Therefore, by inserting the needle portion of the needle valve into the collection valve to a position regulated by the shoulder portion, an appropriate insertion amount can be obtained each time, and the oil sampling work time can be stabilized.

The invention according to claim 4 is the configuration according to any one of claims 1 to 3, wherein the needle valve includes a grip portion having a groove for preventing slip on the outer peripheral surface thereof. A tube connecting device is provided.

According to this configuration, a grip portion having a groove for preventing slippage is provided on the outer peripheral surface of the needle valve, so that the grip portion is gripped when attaching / detaching the needle valve to / from the collection valve. It can be easily and securely attached and detached without slipping fingers.

The invention according to claim 5 provides a fluid passage pipe connecting device in which the needle valve is made of a resin material in the configuration according to any one of claims 1 to 4.

According to this configuration, the needle valve can be easily manufactured by injection molding a resin material or the like, and cost reduction becomes possible.

According to the invention, the needle valve is provided with an annular guide portion, and when the needle portion of the needle valve is inserted into the collection valve when sampling liquid oil or the like, first, the annular guide portion on the connecting side of the collection valve is guided. The needle part of the needle valve is inserted into the collection valve in a state where the insertion port on the collection valve side and the needle part of the needle valve are lined up on substantially the same axis and positioned with each other. The needle part can be smoothly inserted into the collection valve. Therefore, when the needle portion of the needle valve is inserted into the collection valve, the needle portion of the needle valve can be inserted safely and reliably without imposing a burden on the needle portion of the needle valve, so that the insertion work can be simplified.

An embodiment of the fluid passage pipe connecting device according to the embodiment of the present invention is shown, (a) is a side view of the same connecting device shown in a state where the needle valve is removed from the collection valve, and (b) a needle. A side view of the same connection device shown with the valve attached to the collection valve, (c) is a front view of the collection valve as seen from the AA line direction of the same as above (a), and (d) is the same as above (a). It is a front view of the needle valve seen from the BB line direction of). FIG. 1 is a cross-sectional view of the same connection device shown in FIG. 1, (a) is a vertical sectional side view of the same connection device shown in a state where the needle valve is removed from the collection valve, and (b) is a needle valve attached to the collection valve. It is a vertical sectional side view of the same connection device shown in the above state. It is the use explanatory drawing of the connection device which concerns on embodiment of this invention, and is the figure which shows the state before connecting the needle valve to a collection valve by breaking a part. It is the use explanatory drawing of the connection device which concerns on embodiment of this invention, and is the figure which shows the state after connecting the needle valve to a collection valve by breaking a part. It is an enlarged use explanatory view which shows the connection device which concerns on embodiment of this invention, and is the figure before connecting a needle valve to a collection valve. It is explanatory drawing of use of the connection device which concerns on embodiment of this invention, and is sectional drawing which shows the state in the process of connecting a needle valve to a collection valve. It is a usage explanatory view of the connection device which concerns on embodiment of this invention, and is sectional drawing which shows the state after connecting the needle valve to a collection valve. It is a vertical cross-sectional view of the same connection device which shows by breaking a part with the needle valve removed from the collection valve in the explanatory view of the conventional connecting device. It is explanatory drawing of the conventional connection device, and is the vertical cross-sectional view of the same connection device which shows by breaking a part in the state before connecting a needle valve to a collection valve. It is explanatory drawing of the conventional connection device, and is the vertical sectional view of the connection device which shows the state after connecting a needle valve to a collection valve. The components in the conventional connecting device are shown, (a) is a side view of the spool in the needle valve used in the collection valve, (b) is a side view of (a) seen from the cc direction, (c). Is a longitudinal side view of the needle valve, and (d) is a side view of (c) as viewed from the cc direction.

The present invention facilitates the work of inserting the needle of the needle valve into the collection valve, obtains a substantially constant flow rate of liquid oil at the time of oil collection and the time required for collection, and provides a structure that can be realized at low cost. In order to achieve the purpose of providing, a collection valve and a needle valve for attaching and detaching a pair of fluid passage pipes are provided, and when the collection valve and the needle valve are connected, a fluid communicating with each other is provided. A fluid passage pipe connecting device provided with an on-off valve mechanism that closes the fluid passage when the passage and the collection valve and the needle valve are disconnected. The on-off valve mechanism is the said in the collection valve. A spool provided so that the fluid passage can be opened and closed, a spring means provided so that the spool urges the spool in a closing direction for closing the fluid passage, and a connection between the collection valve and the needle valve. Occasionally, it is inserted into the fluid passage of the collection valve, presses the spool against the spring bias of the spring means, and opens the fluid passage in the collection valve to the needle valve side. The needle valve is provided with a needle portion provided, and when the collection valve and the needle valve are connected, the needle valve receives an outer peripheral portion on the connecting side of the collection valve and is inside the fluid passage of the collection valve. This was achieved by providing an annular guide portion on the outer periphery that guides the insertion of the needle portion with respect to the fluid along the substantially axial center of the collection valve.

Hereinafter, an embodiment according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following examples, when the number, numerical value, quantity, range, etc. of the components are referred to, the specific number is used unless it is clearly stated or in principle it is clearly limited to a specific number. It is not limited, and may be more than or less than a specific number.

In addition, when referring to the shape and positional relationship of components, etc., unless otherwise specified or when it is considered that this is not the case in principle, those that are substantially similar to or similar to the shape, etc. shall be used. Including.

In addition, the drawings may be exaggerated by enlarging the characteristic parts in order to make the features easy to understand, and the dimensional ratios and the like of the components are not always the same as the actual ones. Further, in the cross-sectional view, hatching of some components may be omitted in order to make the cross-sectional structure of the components easy to understand.

Further, in the following description, expressions indicating directions such as up and down and left and right are not absolute, and are appropriate when each part of the connecting device for the fluid passage pipe according to the present invention is drawn. However, when the posture changes, it should be changed and interpreted according to the change in the posture. In addition, the same elements are designated by the same reference numerals throughout the description of the examples.

1 and 2 show a fluid passage pipe connecting device 10 (hereinafter, simply referred to as “connecting device 10”) according to the present invention. Of these, FIG. 1A is a side view showing the needle valve 12 of the connecting device 10 removed from the collection valve 11, and FIG. 1B is a side view showing the needle valve 12 removed from the collection valve 11. The side view shown in the state of being attached to the above, FIG. 1 (c) is a front view of the collecting valve 11 seen from the direction of AA line of FIG. 1 (a), and FIG. 1 (d) is a front view. It is a front view of the needle valve 12 seen from the BB line direction of FIG. 1 (b). 2A is a vertical sectional side view showing the needle valve 12 of the connecting device 10 removed from the collection valve 11, and FIG. 2B is a vertical sectional side view showing the needle valve 12 being removed from the collection valve 11. It is a vertical sectional side view which shows in the state which is attached to 11.

3 to 7 show usage explanatory views of the connecting device 10 according to the present invention. Of these, FIG. 3 is a view showing a partially broken state before connecting the needle valve 12 to the collection valve 11, and FIG. 4 is a view after connecting the needle valve 12 to the collection valve 11. It is the figure which shows by breaking a part in the state. FIG. 5 is an enlarged longitudinal side view showing a state before connecting the needle valve 12 to the collecting valve 11, and FIG. 6 is an enlarged longitudinal side view showing a state in which the needle valve 12 is being connected to the collecting 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.

In FIGS. 1 to 7, the connecting device 10 according to the present invention is provided between the collection port block 1 and the oil collection container 2, as shown in FIGS. 3 and 4. The connecting device 10 is used when periodically sampling liquid oil 4 such as hydraulic oil or engine oil stored in an oil storage 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 is always fixed and attached to the oil reservoir 3 with the inlet side of the fluid passage 1a connected to the outlet of the oil reservoir 3. Has been done. Then, the liquid oil 4 in the oil storage container 3 is held in a state of being constantly flowed into the fluid passage 1a of the collection port block 1.

The connecting device 10 is arranged between the collection port block 1 and the oil collection container 2. Further, the connection device 10 is connected to a collection valve 11 that functions 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 that is a fluid passage on the oil collection container 2 side. It is provided with a needle valve 12 that functions 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 portion into the collection valve 11 as a socket portion, and by attaching / detaching the collection valve 11 and the needle valve 12, a pair of fluids can be connected. The fluid passage 1a in the collection port block 1, which is a passage, and the tube 5 are configured to be detachably attached to and detachably connected to each other.

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

The hole 13 of the valve body 11a is connected to the needle valve 12 from the base end portion 11b side fixedly attached to the fluid passage 1a of the collection port block 1 to be described mainly with reference to FIGS. 2, 5 and 6. Small diameter cavity portion 13a, first medium diameter cavity portion 13b, second medium diameter cavity portion 13c, third medium diameter cavity portion 13d, fourth, in order toward the rear surface 11c side of the rear end portion 11A to be connected. The medium-diameter cavity portion 13e and the rear end cavity portion 13f are formed in a state of communicating with each other. Each of the small diameter cavity portion 13a, the first medium diameter cavity portion 13b, the second medium diameter cavity portion 13c, the third medium diameter cavity portion 13d, the fourth medium diameter cavity portion 13e, and the rear end cavity portion 13f. The size of the inner diameter is larger in the order of the small diameter cavity portion 13a, the first medium diameter cavity portion 13b, the second medium diameter cavity portion 13c, the third medium diameter cavity portion 13d, and the fourth medium diameter cavity portion 13e. However, the size of the inner diameter of the rear end cavity portion 13f is formed to be slightly smaller than the size of the inner diameter of the fourth medium diameter cavity portion 13e. Further, on the outer peripheral surface of the base end portion 11b of the valve body 11a, it is screwed into a female screw formed on the inner peripheral surface on the outlet side of the fluid passage 1a in the collection port block 1 and fixed to the collection port block 1. The male screw portion 11d is formed.

Then, in the valve body 11a, the coil spring 18 is flexibly accommodated and arranged along the axis O in the first medium-diameter cavity portion 13b, and the first medium-diameter cavity portion 13b and the second medium-diameter portion 13b are accommodated and arranged. The spool 14 is movably housed and arranged along the axis O in a state where the cavity portion 13c and the third medium-diameter cavity portion 13d are commonly straddled. Further, an annular collar 15 is commonly included in the third medium-diameter cavity portion 13d and the fourth medium-diameter cavity portion 113e, and is concentrically accommodated in the hole 13. Further, when the collar 15 is housed and arranged in the third medium-diameter cavity portion 13d and the fourth medium-diameter cavity portion 13e, it is formed between the second medium-diameter cavity portion 13c and the third medium-diameter cavity portion 13d. The first O-ring 16 is accommodated and arranged in the gap between the circumferential step portion 13g and the collar 15 in the third medium-diameter cavity portion 13d, and the axis of the collar 15 in the third medium-diameter cavity portion 13d. The movement in the direction along the O is regulated by the first O-ring 16. An O-ring positioning groove 15b is provided on the inner peripheral surface of the central through hole 15a in the collar 15. In the O-ring positioning groove 15b, a second O-ring 17 having an inner diameter smaller than the size of the inner diameter of the collar 15 is concentrically positioned and accommodated with the collar 15.

The spool 14 has a rod-shaped spool body 14a and a base end collar portion 14b formed on the base end side of the spool body 14a with an outer diameter substantially equal to the inner diameter of the first medium-diameter cavity 13b. A tip flange 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 cavity 13c and larger than the inner diameter of the collar 15. It integrally has a pin-shaped portion 14d that projects further toward the front of the spool body 14a from the central portion of the tip of the spool body 14a. The outer peripheral surface of the front side portion 14e of the pin-shaped portion 14d (hereinafter, this portion is referred to as “tapered portion 14e”) is chamfered to form a tapered portion. Further, the left and right side portions of the base end flange portion 14b of the spool 14 are each provided with notches 14f, which are notched in a substantially half-moon shape. The notch amount of the notch portion 14f is cut out until the portion of the notch portion 14f that becomes the chord is substantially flush with the outer peripheral surface of the spool main body 14a. The shape of the spool 14 is the same as that of the spool 114 shown in FIGS. 11A and 11B.

Further, in assembling the spool 14 to the valve body 11a, as shown in FIG. 2, the tip flange portion 14c is positioned in contact with the end surface 15c of the collar 15 in a so-called "valve closed position". The pin-shaped portion 14d is inserted into the central through hole 15a of the collar 15 through the first O-ring 16. After that, the coil spring 18 is compressed and arranged in the first medium-diameter cavity portion 13b, and then the compression of the coil spring 18 is released. Then, the spool 14 is pressed against the collar 15 by the spring force of the coil spring 18, and the tip flange portion 14c of the spool 14 and the end face 15c of the collar 15 are brought into close contact with each other to bring them into a sealed state, that is, a valve closed state. The spool 14 is held in the "valve closed position".

The spool 14 which is pressed against the end face 15c of the collar 15 by the spring force of the coil spring 18 and is closely arranged with the end face 15c of the collar 15 at the valve closed position is a needle portion 12a of the needle valve 12 from the outside. Is inserted into the valve body 11a through the rear end cavity portion 13f and the central through hole 15a of the collar 15, and is pushed toward the coil spring 18 by the tip of the needle portion 12a, the coil spring 18 is spring-compressed. The spool 14 is slid to the base end portion 11b side of the valve body 11a. The movement here is to the "valve opening position" where the base of the chamfered tapered portion 14e in the pin-shaped portion 14d comes out from 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 so that the liquid oil 4 can pass between the spool 14 and the collar 15. The seal state of the above is released, and the collection valve 11 can be opened.

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

The annular guide portion 12d includes a disc-shaped bottom portion 12da arranged at a substantially right angle from the outer peripheral surface of the needle portion 12a adjacent to the grip portion 12b toward the outside, and the tip of the needle portion 12a from the outer circumference of the bottom portion 12da. It has a cylindrical portion 12db formed at a right angle toward the side, and is formed in a cup shape in which the tip end side of the needle portion 12a is opened. Further, on the inner surface of the bottom portion 12da of the annular guide portion 12d, a disc-shaped shoulder portion 23 formed by bulging the central portion of the bottom portion 12da toward the opening side is integrally formed with the bottom portion 12da. The size of the outer diameter of the shoulder portion 23 is formed to be slightly larger than the size of the inner diameter of the fourth medium-diameter cavity portion 13e provided in the collection valve 11. When the needle portion 12a is pushed toward the valve body 11a, the shoulder portion 23 is regulated so that the bottom portion 12da does not enter the fourth medium-diameter cavity portion 13e but comes into contact with the rear surface 11c and does not enter any further. It is configured to be.

Further, as shown in FIG. 2, the size D1 of the inner diameter of the annular guide portion 12d is equal to or slightly larger than the size D2 of the outer diameter on the rear end side of the valve body 11a, that is, D1 ≧ D2. Is formed of. Further, the protruding amount of the annular guide portion 12d is formed so as to protrude by a distance L2 larger than the distance L1 of the protruding amount of the needle portion 12a. The outer circumference of the rear end portion 11A of the valve body 11a, which is inserted into the annular guide portion 12d and accommodated, 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. Further, a slit-shaped grind 21 is formed in the tip portion of the needle portion 12a so as to pass through 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 size of the outer diameter of the needle portion 12a in the needle valve 12 is slightly smaller than the size of the inner diameter of the spool 14, and is slightly larger than the size of the inner diameter of the second O-ring 17. The needle portion 12a is densely inserted into the central through hole 15a of the collar 15 while expanding the second O-ring 17. Further, the axial length L1 of the needle portion 12a (see FIG. 2) allows the needle portion 12a to pass through the rear end cavity portion 13f and the central through hole 15a of the collar 15 from the outside of the collection valve 11 to collect the needle portion 12a. When the spool 14 is inserted into the hole 13, the spool 14 is pushed in the axial direction in contact with the tip surface 14g of the spool 14, and the tip flange portion 14c of the spool 14 is pushed into the end surface 15c of the collar 15 as shown in FIG. 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 by the spool 14 is maximized when the position regulating surface 23a of the shoulder portion 23 of the needle valve 12 comes into contact with the rear surface 11c of the collection valve 11. It has been set.

The grip portion 12b of the needle valve 12 is provided between the annular guide portion 12d and the connecting portion 12c along the axis O integrally with the annular guide portion 12d, the connecting portion 12c, and the like. The size of the outer diameter of the grip portion 12b is smaller than the size of the outer diameter of the annular guide portion 12d, and is formed with an outer diameter larger than the size of the outer diameter of the connecting portion 12c, and slips on the outer peripheral surface. A plurality of (two in the example) annular grooves 24 for prevention are provided. The annular groove 24 has irregularities on the outer peripheral surface due to the annular groove 24 when the grip portion 12b is pinched with a finger and the needle valve 12 is moved along the axis O with respect to the valve body 11a of the collection valve 11 for attachment / detachment operation. Is formed, and the unevenness of the surface prevents the finger from slipping on the grip portion 12b. Therefore, the annular groove 24 may be provided in a groove shape having a rhombic eye, for example, instead of the annular groove 24, as long as it can prevent the finger from slipping.

The connecting device 10 configured in this way is a valve of the collection valve 11 as shown in FIGS. 3, 4, 5, 6, and 7 in a state where the collection valve 11 and the needle valve 12 are not connected. The main body 11a is attached to the collection port block 1 on the fixed side. In this installation, the male screw portion 11d of the valve body 11a is screwed and fixed to the outlet side of the fluid passage 1a in the collection port block 1 already attached to the oil storage container 3. When the needle valve 12 is not connected to the collection valve 11, the spool 14 is on the collar 15 side by the spring force of the coil spring 18 as shown in FIGS. 2A, 3 and 5. The tip flange portion 14c is pressed against the end face 15c of the collar 15, and the spool 14 is in a valve closed state between the collar 15 and the spool 14, that is, the hole 13 which is a fluid passage is closed.

Then, when the liquid oil 4 in the oil storage container 3 is collected in the oil collection container 2 for sampling, a tube connected to the connecting portion 12c of the needle valve 12 as shown in FIGS. 3 and 4. With the end of No. 5 inserted into the oil sampling container 2, the needle portion 12a of the movable needle valve 12 is inserted into the rear end cavity portion 13f. In the insertion work here, prior to the insertion, the rear end portion 11A of the valve body 11a is first inserted and accommodated in the annular guide portion 12d as shown in FIG. In this insertion accommodation, when the rear end portion 11A of the valve body 11a is inserted and accommodated in the annular guide portion 12d, the taper guide surface 11e is formed on the rear surface 11c of the rear end portion 11A over the entire circumference, so that the valve body The rear end portion 11A of 11a is guided by the taper guide surface 11e and smoothly inserted into the annular guide portion 12d and accommodated. Further, when the rear end portion 11A of the valve body 11a is inserted into the annular guide portion 12d and accommodated, the collection valve 11 and the needle valve 12 are arranged so as to coincide with each other and face each other.

Further, when the needle valve 12 is further pushed toward the collection valve 11 in a state where the collection valve 11 and the needle valve 12 are arranged so as to coincide with the axis O, the needle portion 12a of the needle valve 12 is aligned with the axis O. The needle is inserted into the valve body 11a of the collection valve 11 through the rear end cavity 13f and the central through hole 15a of the collar 15 in this order. Further, when it is inserted to a predetermined position, the tip of the needle portion 12a abuts on the tip surface 14g of the pin-shaped portion 14d of the spool 14. Further, when further inserted, the entire spool 14 is pushed toward the coil spring 118 by the tip of the needle portion 12a of the needle valve 12. Then, the needle valve 12 slides the entire spool 14 toward the coil spring 18, that is, the collection port block 1 side while compressing the coil spring 18. FIG. 6 shows a state during the movement.

Further, when the tapered portion 14e of the spool 14 is pulled out from the end surface 15c of the collar 15 toward the collection port block 101, a gap through which the liquid oil 4 passes is formed between the collar 15 and the tapered portion 14e. , The spool 14 in the collection valve 11 is in a state where the valve is opened. Then, as shown in FIGS. 4 and 7, when the shoulder portion 23 of the needle portion 12a comes into contact with the rear surface 11c of the valve body 11a, the needle valve 12 is restricted from moving further. Further, when the shoulder portion 23 and the rear surface 11c come into contact with each other, as shown in FIGS. 2B, 4 and 7, the tapered portion 14e of the spool 14 is subjected to the collection port block from the end surface 15c of the collar 15. The distance S is extracted to one side, and 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. ..

Then, as shown in FIG. 2B, FIGS. 4 and 7, the needle portion 12a of the needle valve 12 is inserted into the collection valve 11, and the collection valve 11 is moved by the movement of the spool 14 in the collection valve 11. When the valve is opened, the liquid oil 4 in the oil storage container 3 is charged with the fluid passage 1a of the collection port block 1-the small-diameter cavity portion 13a of the valve body 11a-the first medium-diameter cavity portion 13b-the first medium-diameter cavity portion 13b. Gap between the inner peripheral surface of the spool 14 and the notch 14f in the spool 14-Gap between the inner peripheral surface of the second medium-diameter cavity 13c and the tip flange 14c of the spool 14-Tapered shape in the collar 15 and spool 14 The gap between the portions 14e-the central through hole (fluid passage) 15a of the collar 15-the split 21 of the needle portion 12a-the through hole (fluid passage) 20 of the needle portion 12a flows in the tube 5 in order. Further, from the tube 5, the oil flows into the oil collection container 2 shown in FIG. 4, and a part of the liquid oil 4 in the oil storage container 3 can be sampled in the oil collection container 2.

When a predetermined amount of oil has been collected in the oil collection container 2, the needle portion 12a of the needle valve 12 is pulled out from the collection valve 11. When the needle valve 12 is pulled out from the collection valve 11, the spool 14 is returned to the collar 15 side by the spring force of the coil spring 18 along with the pulling out, and the tip flange portion 14c comes into close contact with the end surface 15c of the collar 15. , Returns to the valve closed state. As a result, the liquid oil 4 in the oil storage container 3 is prevented from leaking to the outside 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 storage container 3 is sampled and the oil collection container is used. It is possible to check the degree of dirtiness of the liquid oil 4 in the oil storage container 3 and analyze the components from a part of the liquid oil 4 taken out into the oil storage container 3.

Therefore, according to the configuration of the connecting device 10 of the present embodiment, the needle valve 12 is provided with the annular guide portion 12d, and when sampling the liquid oil 4 or the like, the needle portion 12a of the needle valve 12 is inside the collection valve 11. When the needle valve 12 is inserted into the annular guide portion 12d, the outer peripheral portion (rear end portion 11A) on the connecting side of the collection valve 11 is received, and the insertion port on the collection valve 11 side and the needle portion 12a of the needle valve 12 are inserted. , The axis lines O are aligned and aligned in a straight line, and the needle portion 12a of the needle valve 12 is inserted into the collection valve 11 in a state of being positioned with each other. Therefore, the needle portion 12a is smoothly inserted into the collection valve 11. be able to. As a result, when the needle portion 12a of the needle valve 12 is inserted into the collection valve 11, the needle portion 12a of the needle valve 12 can be inserted safely and reliably without imposing a burden on the needle valve 12, thus simplifying the work. It can be planned. In this embodiment, the annular guide portion 12d discloses a structure in which the tip end side of the needle portion 12a is formed in a cup shape, but even if it is not a perfect cup shape, it is after the valve body 11a. As long as it can accept the end portion 11A, it may be, for example, a spirally wound tubular portion.

Further, a through hole 20 forming a part of the fluid passage pipe is provided at substantially the center of the needle portion 12a of the needle valve 12, and from the outer peripheral surface to the inside of the through hole 20 which is a fluid passage at the tip portion on the insertion side. Since the extended slit-shaped 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 in order to sample the liquid oil 4, the collection valve is provided. 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 grind 21 at a constant speed, so that the time required for collecting the liquid oil 4 Can be stabilized.

Further, since the shoulder portion 23 that regulates the insertion amount of the needle portion 12a into the collection valve 11 is provided between the rear surface 11c of the valve body 11a of the collection valve 11 and the inner surface of the annular guide portion 12d of the needle valve 12. 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 insertion amount is always constant, the insertion amount at the time of connection is stable. As a result, the collection time of the liquid oil 4 is stabilized.

Further, since the grip portion 12b having the groove 24 for preventing slippage is provided on the outer peripheral surface of the needle valve 12, the grip portion 12b is not pinched when the needle valve 12 is attached to or removed from the collection valve 11. It can prevent the fingers from slipping and can be securely attached and detached.

Further, since the needle valve 12 is made of a resin material, the needle valve 12 can be easily manufactured by molding 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 as long as it does not deviate from the spirit of the present invention, and it is natural that the present invention extends to the modified ones. For example, in the above embodiment, the structure in which the collection valve 11 side is fixed in position and the needle valve 12 side is movably arranged is disclosed, but conversely, the needle valve 12 side is fixed in position and the collection valve 11 side is movable. The structure may be freely arranged.

1: Collection port block 1a: Fluid passage 2: Oil collection container 3: Oil storage 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 threaded portion 11e: Tapered guide surface 12: Needle valve 12a: Needle portion 12b: Grip portion 12c: Connecting portion 12d: Circular guide portion 12da: Bottom portion 12db: Cylindrical portion 13: Hole 13a: Small diameter cavity portion 13b: First Medium-diameter cavity 13c: Second medium-diameter cavity 13d: Third medium-diameter cavity 13e: Fourth medium-diameter cavity 13f: Rear end cavity 13g: Circular step portion 14: Spool 14a: Spool body 14b : Base end flange 14c: Tip flange 14d: Pin-shaped portion 14e: Part 14f: Notch 14g: Tip surface 15: Collar 15a: Center through hole 15b: O-ring positioning groove 15c: End surface 16: First O-ring 17: Second O-ring 18: Cylinder spring 20: Through hole 21: Slit
23: Shoulder 23a: Position regulation surface 24: Groove L1: Distance L2: Distance O: Axis S: Distance

Claims (5)

It is provided with a collection valve and a needle valve for attaching and detaching a pair of fluid passage pipes, and when the collection valve and the needle valve are connected, the fluid passage communicating with each other and the collection valve and the needle valve are provided. A fluid passage pipe connecting device provided with an on-off valve mechanism that closes the fluid passage when the connection with the fluid passage is removed.
The on-off valve mechanism is
A spool provided so that the fluid passage in the collection valve can be opened and closed, and
A spring means provided so that the spool urges the spool in a closing direction in which the spool closes the fluid passage.
At the time of connecting the collection valve and the needle valve, the spool is inserted into the fluid passage of the collection valve and presses the spool against the spring tension of the spring means, and the fluid passage in the collection valve. A needle portion provided on the needle valve side so as to open is provided.
The needle valve receives the connection-side outer peripheral portion of the collection valve when the collection valve and the needle valve are connected, and inserts the needle portion into the fluid passage of the collection valve of the collection valve. A fluid passage pipe connecting device characterized in that an annular guide portion for guiding along a substantially axial center is provided on the outer circumference. The fluid passage pipe connecting device according to claim 1, wherein the needle portion is provided with a slit extending from an outer peripheral surface to the inside of the fluid passage at a tip portion on the insertion side. The fluid passage pipe connecting device according to claim 1 or 2, wherein the needle valve includes a shoulder portion that regulates an insertion amount of the needle portion with respect to the collection valve. The fluid passage pipe connecting device according to any one of claims 1 to 3, wherein the needle valve includes a grip portion having a groove for preventing slip on the outer peripheral surface. The fluid passage pipe connecting device according to any one of claims 1 to 4, wherein the needle valve is made of a resin material.

Images