JP2001324069A - Pipe connecting structure for valve system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain sure liquid-tight status by preventing shift of a position of a packing, to prevent shift of a position of a pipe and to easily detach a filter. SOLUTION: An auxiliary pipe 30 is detachably inserted into a large diameter recessed part 14 of a connecting pipe 10. A cylindrical projecting part 32 projected from an opening end 10a of the connecting pipe 10 is provided. The position of a packing 24 in a radial direction in determined by externally fitting the packing 24 to the cylindrical projecting part 2. A union nut 22 is screwed on the connecting pipe 10 with an opening end 16a of a water feed pipe 16 abutting to a face of the packing 24 on an opposite side to a face where the opening end 10a of the connecting pipe 10 abuts. The opening end 10a of the connecting pipe 10 and the opening end 16a of the water feed pipe 16 are thereby pressure- contacted to the packing 24, and both pipes 10 and 16 are liquid-tightly communicated and connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure of a valve device, and more particularly to a pipe connection structure of a valve device for connecting a connection pipe of a valve device and a pipe in a liquid-tight manner through a packing. Things.

[0002]

2. Description of the Related Art As a device for receiving a supply of water from an external water supply system such as a water supply, consuming the water and providing it to a required use,
Examples include a washing machine and an ice making machine. In these devices, a water supply pipe for supplying tap water and a water supply pipe for supplying tap water to a predetermined portion inside the device are connected via a solenoid valve as a valve device, and the water supply pipe is required under the action of the solenoid valve. It is configured to supply an amount of tap water to a predetermined site. The connection between the solenoid valve and the water supply pipe has a structure shown in FIG. 7, for example. That is, the connection pipe 10 on the inlet side of the solenoid valve has a male screw 12 threaded around its outer periphery, and a large-diameter recess 14 is formed inside the connection pipe 10 at a predetermined depth from the opening end 10a. On the other hand, connecting pipe 1 in water supply pipe 16
An outer flange 18 extending in the outer diameter direction is formed on the entire outer periphery of an end portion opposite to the open end 10a of the “0”, and a female screw 20 that can be screwed with the male screw 12 of the connection pipe 10 is provided. A union nut 22 screwed around the inner periphery is provided.
The union nut 22 has an inner flange 22a formed at one end in the axial direction, and a through hole 22b at the center thereof for allowing the water supply pipe 16 to be inserted but preventing the outer flange 18 from being inserted. It is. The union nut 22 has its open side (the side opposite to the side where the inner flange 22a is formed) that is fully open coincides with the open end side of the connection pipe 10, and the inner flange 22a is The water supply pipe 16 is provided so as to be able to abut on the surface of the flange 18 away from the connection pipe 10.

In the above-described structure, the connection pipe 10 of the solenoid valve is
When the connection nut 10 is connected to the water supply pipe 16, the union nut 22 is connected to the connection pipe 10 in a state where the open end 10 a of the connection pipe 10 and the open end 16 a of the water supply pipe 16 abut each other with the ring-shaped packing 24 interposed therebetween. By screwing the connection pipe 10, the connection pipe 10 and the open ends 10 a, 16 a of the water supply pipe 16 are pressed against the packing 24 to be connected in a liquid-tight manner.

[0004] The water supplied to the above-mentioned various devices is required to be free of foreign matter and other contaminants. Therefore, a filter 26 for removing foreign matter is inserted into the connection pipe 10. Be placed. The filter 26 is formed by bending an elastic portion 26b larger than the inner diameter of the large-diameter recess 14 at the open end of a main body 26a formed in a dome shape smaller than the inner diameter of the large-diameter recess 14. And elastic part 2
When the filter 26 is elastically abutted against the inner peripheral surface of the large-diameter recess 14, the filter 26 is pushed down to a position where the open end contacts the step 28 on the deep side of the large-diameter recess 14.
Are arranged at fixed positions of the large-diameter concave portion 14.

[0005]

In the above-described pipe connection structure for an electromagnetic valve, when the ring-shaped packing 24 is positioned between the opening end 10a of the connection pipe 10 and the opening end 16a of the water supply pipe 16, the packing is used. Since there is no member that restricts the radial displacement of the packing 24, it is difficult to hold the packing 24 at an appropriate position between the connection pipe 10 and the water supply pipe 16, and the packing 24 is connected in a radially displaced state. Sometimes. Until the union nut 22 is screwed into the connecting pipe 10 and the connecting pipe 10 and the water supply pipe 16 are pressed against the packing 24, the packing 24 is easily displaced, and may be misaligned when the union nut 22 is screwed. is there. As described above, when the packing 24 is displaced from the proper position, the contact portion between the opening end 10a of the connection pipe 10 and the packing 24 decreases, and water leakage easily occurs. Further, if the packing 24 is largely displaced, a portion where the packing 24 does not come into contact with the opening end 10a of the connection pipe 10 is generated, which causes a problem that water leaks from the portion.

That is, the connection pipe 10 and the water supply pipe 1
In the connection work with 6, the packing 24 must be carried out with care so as not to be displaced.
The connection work took time and was complicated.

Further, when the water supply pipe 16 is displaced in the radial direction with respect to the connection pipe 10 during the connection work between the connection pipe 10 and the water supply pipe 16, the packing 24 is not sandwiched between the two pipes 10 and 16. It is pointed out that it is perfect and water leaks easily. The filter 26 is
Since the elastic portion 26b is pressed into the inner peripheral surface of the large-diameter concave portion 14 while being pushed into the deep side of the large-diameter concave portion 14 in the connecting tube 10, the elastic portion 26b can be easily taken out from the opening side of the connecting pipe 10. Could not clean.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in order to preferably solve the above-mentioned drawbacks inherent in a pipe connection structure of a valve device according to the prior art. It is an object of the present invention to provide a pipe connection structure of a valve device capable of achieving a liquid tight state, preventing displacement of a pipe and facilitating removal of a filter.

[0009]

In order to solve the above-mentioned problems and to achieve the intended object, a pipe connection structure for a valve device according to the present invention comprises a pipe connected to an open end of a connection pipe in the valve device via a packing. A pipe connecting structure for connecting the connecting pipe and the pipe by connecting means in a state where the opening ends of the connecting pipes are abutted with each other. A positioning projection, which is removably inserted and projects from the open end of the connection pipe at a predetermined length, is provided at an end of the auxiliary pipe facing the pipe, and the packing is fitted on the positioning projection. It is characterized by being constituted so that it may be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a pipe connection structure for a valve device according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. The same members described in the related art with reference to FIG. 7 are denoted by the same reference numerals, and detailed description will be omitted.

1 to 3 show a pipe connection structure according to a preferred embodiment. A water supply pipe (pipe) 16 is connected to a connection pipe 10 on the inlet side of a solenoid valve as a valve device. And are connected in a liquid-tight manner.
The connecting means comprises a male screw 1 screwed around the outer circumference of the connecting pipe 10.
2 and a union nut 22 provided on the water supply pipe 16
By screwing the female screw 20 of the union nut 22 into the male screw 12 of the connection pipe 10, the connection pipe 10
And the water supply pipe 16 are communicated and connected as described above.

A cylindrical auxiliary pipe 30 is removably inserted into the large-diameter recess 14 formed in the connection pipe 10. The auxiliary pipe 30 has a cylindrical main body 30a which is set to have a slightly smaller diameter than the inner diameter of the large-diameter recess 14 and can be inserted into and removed from the large-diameter recess 14 from the opening side. Is positioned by abutting the insertion end of step S on the step 28 of the large-diameter recess 14. The axial length of the main body 30a is set to be substantially the same as the depth of the large-diameter concave portion 14, and an end of the main body 30a facing the water supply pipe 16 has a cylindrical projection having a diameter smaller than that of the main body 30a. (Positioning projection) 32
The connecting pipe 10 is provided so as to protrude outward from the opening end 10a by a predetermined length. The auxiliary pipe 30 is connected to the large-diameter recess 1.
4, the axial center of the cylindrical projection 32 and the axis of the connection pipe 10 are substantially aligned. The length of the cylindrical projection 32 of the embodiment is the same as that of the ring-shaped packing 2.
The thickness is set to be substantially the same as the thickness of No. 4.

The outer diameter of the cylindrical projection 32 is set slightly smaller than the inner diameter of the packing 24.
By externally fitting the packing 24, the packing 24 is configured to be positioned in the radial direction. That is,
As shown in FIG. 1, the entire surface of the open end 10 a of the connection pipe 10 comes into contact with the opposite surface of the packing 24 in a state where the packing 24 is externally fitted to the cylindrical projection 32. When connecting and connecting the connecting pipe 10 and the water supply pipe 16 with the packing 24 therebetween, the pipe 1
6 is set so as not to interfere with the end of the cylindrical projection 32.

A filter 26 for removing foreign substances similar to that described above is inserted and disposed inside the main body 30a of the auxiliary pipe 30. This filter 26 is formed by bending an elastic portion 26b larger than the inner diameter of the main body 30a at the open end of a main body 26a formed in a dome shape smaller than the inner diameter of the main body 30a. Main unit 30
a of the main body 30a in a state of elastically contacting the inner peripheral surface of the main body 30a.
At the insertion end side of the large-diameter concave portion 14 at the position. When the auxiliary pipe 30 is inserted into the large-diameter recess 14 of the connection pipe 10, the open end of the filter 26 comes into contact with the step 28, and the movement of the filter 26 is restricted. . Incidentally, the filter 26 is formed by forming a stainless steel material into a net shape.

[0015]

Next, the operation of the solenoid valve pipe connection structure according to the embodiment will be described. When connecting the water supply pipe 16 to the connection pipe 10 of the solenoid valve, first, the filter 26 is elastically inserted and arranged inside the main body 30a of the auxiliary pipe 30. The auxiliary pipe 30 is inserted into the large-diameter recess 14 of the connection pipe 10, and the insertion end of the main body 30 a is positioned in contact with the step 28 on the deep side of the recess 14. At this time, the open end of the filter 26 also comes into contact with the step 28, and the movement of the filter 26 is restricted.

The cylindrical projection 32 of the auxiliary pipe 30 protrudes from the opening end 10a of the connecting pipe 10 by a predetermined length.
The positioning of the packing 24 with respect to the opening end 10a of the connection pipe 10 is performed. Next, the union nut 22 is screwed into the connection pipe 10 in a state where the opening end 16a of the water supply pipe 16 is in contact with the surface of the packing 24 opposite to the surface where the opening end 10a of the connection pipe 10 abuts. Thereby, the open end 10a of the connection pipe 10 and the open end 16a of the water supply pipe 16 are pressed against the packing 24, and
6 is connected in a fluid-tight manner.

Since the packing 24 is positioned in the radial direction by being externally fitted to the cylindrical projection 32 of the auxiliary pipe 30, there is no displacement in the radial direction during the connection work, and the packing 24 and the water supply It is held at an appropriate position between the pipe 16. Also, when the union nut 22 is screwed into the connection pipe 10, the packing 24 is not displaced, so that it is possible to suitably prevent the occurrence of water leakage at the connection between the connection pipe 10 and the water supply pipe 16. In addition, since it is not necessary to perform the connecting operation while paying attention to the displacement of the packing 24, the workability is good, and the connecting operation can be easily performed in a short time. Further, since the filter 26 is inserted and arranged in the auxiliary pipe 30, the water supply pipe 16
By taking out the auxiliary pipe 30 from the connection pipe 10 from which
The auxiliary pipe 30 and the filter 26 can be easily cleaned.

[0018]

[Modification] FIGS. 4 to 6 show a modification of the pipe connection structure. Since the basic structure is the same as that of the above-described embodiment, only different parts will be described. That is, in the auxiliary pipe 30 according to the first modified example shown in FIG. 4, the axial length of the main body 30 a is set to be shorter than the depth of the large-diameter recess 14 by a predetermined length. When the portion 30a is inserted and arranged, the cylindrical protrusion 32 in the main body 30a is formed.
The outer end 30b is set to be located inside the open end 10a of the connection pipe 10 (inside the large-diameter recess 14). As a result, a required gap 38 is defined at an opposing portion between the end 30b and the packing 24, and the packing 24 is connected to the open end 10a of the connection pipe 10 and the open end 1 of the water supply pipe 16.
6a. That is, the end 30b of the main body 30a may be connected to the connecting pipe 10 due to a dimensional error of the auxiliary pipe 30, the connecting pipe 10, the filter 26, or the like, or a displacement of the mounting position of the filter 26.
Does not protrude outwardly from the opening end 10a of the seal 24, and secure liquid tightness by the packing 24 is ensured. Note that the length of the cylindrical projection 32 in the first modified example is the same as that of the gap 3
It is longer than the thickness of the packing 24 by 8 minutes.

Next, in the auxiliary pipe 30 according to the second modified example shown in FIG.
The inner diameter of the portion (at the portion facing the portion where the filter 26 is inserted and arranged) is set smaller than the inner diameter of the water supply pipe 16 by a predetermined length. As a result, the flow rate of water supplied from the water supply pipe 16 to the connection pipe 10 can be reduced. That is, with respect to the connection pipe 10, the inlet-side inner diameter portion 4
By selecting and inserting the auxiliary pipes 30 having different inner diameters of 0, the flow rate of the water supplied to the connection pipe 10 can be adjusted.

Further, the auxiliary pipe 3 of the third modification shown in FIG.
In FIG. 4, in the state where the main body 34a of the auxiliary pipe 34 is inserted and arranged in the large-diameter recess 14 of the connecting pipe 10, the projecting dimension of the cylindrical protrusion (positioning protrusion) 36 protruding from the end of the main body 34a. But,
The thickness is set to be longer than the thickness of the packing 24.
The outer diameter of the cylindrical protrusion 36 is set slightly smaller than the inner diameter of the water supply pipe 16, and the distal end of the cylindrical protrusion 36 protruding from the packing 24 is inserted into the water supply pipe 16. I have.

In the third modified example, after the packing 24 is externally fitted to the cylindrical projection 36 of the auxiliary pipe 34 inserted and arranged in the large-diameter recess 14 of the connection pipe 10, the water supply pipe 1
6 into the connecting pipe 1 so that the tip of the cylindrical projection 36 is inserted.
The water supply pipe 16 is held at an appropriate position with respect to the connection pipe 10 by facing the connection pipe 10. Therefore, the packing 24 can be reliably clamped between the connecting pipe 10 and the water supply pipe 16, and the occurrence of water leakage due to incomplete clamping can be prevented.

In the third modification, as shown in FIG.
The filter 26 is inserted and arranged inside the large-diameter concave portion 14. The auxiliary tube 34 is positioned by contacting the insertion end of the auxiliary tube 34 with the elastic portion 26b of the filter 26. Auxiliary tube 34 in the same manner as the
The filter 26 may be inserted and arranged inside the main body 34a. In addition, the configuration of each modified example can employ the two configurations as appropriate or employ all configurations, in addition to employing the configuration alone.

In the embodiment, the case where the positioning projection is formed in a cylindrical shape has been described. However, the present invention is not limited to this, and it is possible to restrict the displacement of the packing in the radial direction. For example, it may be composed of a plurality of projecting pieces projecting apart from each other in the circumferential direction of the auxiliary pipe. Further, in the embodiment, the case where the connection pipe on the inlet side of the solenoid valve and the water supply pipe are connected has been described, but the same structure may be adopted for the connection between the connection pipe on the outlet side and the water distribution pipe (pipe). it can. Further, the valve device is not limited to the solenoid valve, and may be another type of valve. The liquid that is controlled to be supplied by the valve device may be juice or another beverage other than water.

[0024]

As described above, according to the pipe connection structure of the valve device according to the present invention, since the packing is externally fitted to the positioning projection of the auxiliary pipe inserted and arranged in the connection pipe, the packing is positioned. In addition, it is possible to prevent the packing from being displaced during the connection work, and to prevent the occurrence of liquid leakage from the connection portion. Further, since there is no need to perform the connecting operation while paying attention to the displacement of the packing, there is an advantage that the operation can be easily performed in a short time.

Since the positioning projection of the auxiliary pipe is inserted into the pipe, the pipe can be prevented from being displaced in the radial direction with respect to the connection pipe, and the packing is incompletely held. This can prevent the occurrence of liquid leakage. Further, by inserting and arranging the filter in the auxiliary pipe, it is possible to easily remove the filter together with the auxiliary pipe from the connection pipe and clean the filter. Further, by setting a gap between the end of the auxiliary pipe outside the positioning protrusion and the opposing part of the packing, the packing is securely pressed against the open end of the connection pipe and the open end of the pipe. And more reliable liquid tightness can be secured. By setting the inner diameter of the auxiliary pipe different from the inner diameter of the pipe,
Flow rate adjustment is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a pipe connection structure according to a preferred embodiment of the present invention.

FIG. 2 is an exploded side view showing the auxiliary pipe, the packing, and the filter in the pipe connection structure according to the embodiment, partially cut away.

FIG. 3 is an exploded perspective view of an auxiliary pipe, a packing, and a filter in the pipe connection structure according to the embodiment.

FIG. 4 is a vertical sectional side view showing a pipe connection structure according to a first modification.

FIG. 5 is a vertical sectional side view showing a pipe connection structure according to a second modification.

FIG. 6 is a longitudinal sectional side view showing a pipe connection structure according to a third modification.

FIG. 7 is a longitudinal sectional side view showing a pipe connection structure according to a conventional technique.

[Explanation of symbols]

Reference Signs List 10 connection pipe, 10a open end, 14 large-diameter concave part, 16 water supply pipe (pipe) 16a open end, 24 packing, 26 filter, 30
Auxiliary pipe, 30b End 32 Cylindrical projection (positioning projection), 34 Auxiliary pipe, 36 Cylindrical projection (positioning projection) 38 Gap

Claims (5)

[Claims] An opening end (10) of a connecting pipe (10) in a valve device.
(a) a pipe connecting structure for connecting the connecting pipe (10) and the pipe (16) by connecting means in a state where the open end (16a) of the pipe (16) is abutted via a packing (24). Auxiliary pipes (30, 34) are removably inserted into a large-diameter recess (14) formed at a predetermined depth from the open end (10a) of the connection pipe (10), and the auxiliary pipe (30, Positioning projections (32, 36) projecting at a predetermined length from the open end (10a) of the connection pipe (10) project from an end of the connection pipe (16) facing the pipe (16). A pipe connection structure for a valve device, characterized in that the packing (24) is externally fitted to (32, 36). 2. A tip of the positioning projection (32, 36) is set so as to be inserted into the pipe (16), and the positioning projection (32, 36) allows a radial direction of the pipe (16) to be inserted. The pipe connection structure for a valve device according to claim 1, wherein the pipe connection structure is configured to restrict the displacement. 3. The pipe connection structure for a valve device according to claim 1, wherein a filter (26) is removably inserted into the auxiliary pipe (30). 4. A positioning projection (3) on said auxiliary pipe (30).
2) A required gap (38) is defined at a portion facing the outer end (30b) and the packing (24).
The pipe connection structure for a valve device according to any one of claims 1 to 3. 5. An inner diameter of the auxiliary pipe (30) is equal to the pipe (1).
The pipe connection structure for a valve device according to any one of claims 1 to 4, wherein the pipe connection structure is set to be different from the inner diameter of (6).