JP2009041641A - Check valve structure of flow channel cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve structural stability and assembling performance of a check valve with respect to a check valve structure of a fluid channel cylinder. <P>SOLUTION: There is provided a check valve structure of a flow channel cylinder which checks a reverse flow of supply fluid supplied to a flow channel. In the check valve structure, the flow channel cylinder comprises a body 2 and a nipple 3, which are jointed and fixed together by a jointing and fixing means (2a, 3a) at a jointing section. The check valve structure of the flow channel cylinder is arranged with a valve 5 which includes a ring-shaped flange intervening in the mating face of the jointing section and is made up of a cylindrical elastic body provided in the central part of the flow channel from the side of the nipple in an inner space of the jointing section, a guide cover member 6 which includes a flat plate for covering an opening end of the cylindrical elastic body of the valve 5 and is provided, on the reverse side of the flat plate, with a guide column, that slides circumferentially along a wall surface of the inner space, at intervals via a rib joined to the flat plate, and an elastic member 7 which invariably energizes the guide cover member to its closing direction to ensure the flow channel in the central part of the flow channel cylinder. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve structure for a cylinder for a flow passage applied to a body portion of a washer nozzle that injects a supply liquid onto, for example, a windshield of an automobile.

2. Description of the Related Art Conventionally, a check valve for preventing a backflow of cleaning liquid is provided in a nozzle body of a washer nozzle. For example, as shown in Patent Document 1 known as Conventional Example 1 and shown in FIG. 5A, a rubber O-ring valve 18 having a sealing property is provided at a fitting portion between the lower body 16 and the upper body 17. An elastic member 19 that urges the valve 18 to always close is provided. The assembly of the upper body 17 and the lower body 16 is sealed by sandwiching the fixing portion 18a of the O-ring valve 18 by a pivotal structure of a recess and a protrusion. Further, as disclosed in Patent Document 2 as Conventional Example 2 and shown in FIG. 5 (B), a filter 21 is provided at the lower part of the valve body 20 to prevent foreign substances in the cleaning liquid from passing therethrough. Some are known to prevent clogging.
JP 2003-211028 A JP 2004-298778 A

  However, in the nozzle body of the washer nozzle of Conventional Example 1, since the coil spring 19 which is a metal elastic body directly presses the rubber O-ring valve 18, it tends to be painful over time. Further, in the conventional example 2, since the coil spring 22 directly presses the rubber valve 20, this is not preferable for the valve 20, and the filter 21 has a body direction opposite to the flow direction of the cleaning liquid. Since the fitting portion 23 is press-fitted, the filter 21 may fall off the fitting portion 23 due to the secular change of the fitting portion 23. The washer nozzle according to the present invention has been proposed to solve such problems.

  The gist of the present invention for solving the above-described problems of the check valve structure for a flow path cylinder according to the present invention is to reverse the flow path cylinder that prevents the backflow of the supply liquid supplied to the flow path. In the stop valve structure, the flow path cylinder includes a body and a nipple which are two cylindrical divided bodies having a flow path for a supply liquid, and the body and the nipple are connected by a connection fixing means in a connection portion. A valve made of a cylindrical elastic body that is connected and fixed to each other and has a ring-shaped flange that is interposed on the mating surface of the connecting portion from the nipple side in the inner space portion of the connecting portion and has a flow path in the center portion And a rib that connects the flat plate member with a guide column that slides along the wall surface of the inner space portion on the back surface side of the flat plate member, the flat plate member covering the open end of the cylindrical elastic body of the valve. A guide lid member provided at intervals in the circumferential direction, Ido lid member is always arranged an elastic member formed by securing a flow path in the central portion takes the reaction force on the body side so as to urge the closing direction.

A ring-shaped flange of the valve is interposed on a mating surface of the connecting and fixing portion of the body and the nipple, and a ring-shaped projection for sealing is provided on the mating surface;
One end of an elastic member is engaged with the guide column of the guide lid member, and at least the guide lid member is engaged by sliding contact with a frictional force that does not fall off from the elastic member by its own weight;
Is included.

According to the check valve structure of the flow path cylinder of the present invention, the valve serves as a seal material for the mating surface of the body and the nipple at the flange portion, and the cylindrical elastic body serves as the check valve reel member. Function.
In addition, when the guide lid member for the check valve is in direct contact with the opening of the valve and seals, the guide lid member is made of synthetic resin and the valve is made of rubber. The abutment surface is soft-touched, so that the rubber valve is not directly pressed by a metal elastic member as in the prior art, and the stability of the check valve structure is improved.

By providing a ring-shaped projection on one of the mating surfaces of the body and nipple, the sealing performance is further improved.
One end portion of the elastic member is engaged with the guide column of the guide lid member, and the guide lid member is engaged by sliding contact with a frictional force that does not fall off the elastic member due to its own weight. Easier to handle, and can be handled and assembled together.

  As shown in FIG. 1, a washer nozzle (hereinafter referred to as a nozzle) 1 configured to have a check valve structure for a flow path cylinder according to the present invention, for example, for supplying a cleaning liquid to an automobile washer nozzle or the like. Further, the nozzle body 2 and the nozzle nipple 3 which are two upper and lower cylindrical divided bodies having a flow path for the supply liquid are formed.

  The connection fixing portion 4 of the nozzle body 2 and the nozzle nipple 3 is connected and fixed by a connection fixing means of an engagement projection 3a and an engagement hole 2a provided so as to be fitted to the cylindrical wall surface. . As shown in FIGS. 1 and 2, the inner space portion 4 a of the connection fixing portion 4 has a ring-shaped flange 5 a interposed on the mating surface of the connection fixing portion 4 from the nozzle nipple 3 side. There is a valve 5 made of a cylindrical elastic body provided with a passage 5b in the center.

  And it has the flat plate body 6a which covers the opening end part 5c of the cylindrical main body of the said valve | bulb 5, and the guide pillar 6b was provided in the back surface side of this flat plate body 6a as an example with four ribs 6c. The other end of the guide lid member 6 contacts the step 2b provided on the inner wall surface of the nozzle body 2 so as to constantly urge the guide lid member 6 in the closing direction, thereby taking reaction force, An elastic member 7 having a channel 7a secured at the center is arranged by engaging the portion with the inner side of the guide post 6b and the end face of the rib 6c.

  The nozzle body 2 and the nozzle nipple 3 are made of synthetic resin, and the valve 5 is made of rubber. Further, as shown in FIG. 2, the valve 5 is a cylindrical molded product having a dish-shaped cross section. The flange 5a of the valve 5 is pressed against the mating surface of the lower surface of the nozzle body 2 and the upper surface of the nozzle nipple 3 to prevent leakage of the supply liquid.

  Further, as shown in FIG. 2, the position of the opening end 5c is set higher than the position of the end surface of the connecting projection 3b of the nozzle nipple 3 so that the check valve is received at the end surface of the opening end 5c. It has become. Thereby, even if there is some manufacturing inclination or unevenness on the lower surface of the synthetic resin guide lid member 6 serving as a check valve, the rubber opening end portion 5c becomes familiar and closely adheres to the supply liquid. This is to prevent leakage.

  Further, as shown in FIG. 3A, a sealing ring-shaped protrusion 2 c is provided on the mating surface of the nozzle body 2. As a result, the upper surface of the flange 5a interposed between the mating surfaces is strongly pressed in a ring shape, and the leakage of the supply liquid is completely sealed. Similarly, on the lower surface of the flange 5a of the valve 5, two sealing projections 5c are provided in a ring shape.

  As shown in FIG. 3, the guide column 6 b of the guide lid member 6 is set so that the outer wall surface of the guide column 6 b slides on the wall surface of the inner space portion 4 a of the nozzle body 2. Thereby, the backlash of the guide lid member 6 is eliminated.

  Furthermore, one end portion of the coil spring 7 that is an elastic member, that is, the engaging portion 7b in the lower position, is at least inside the guide column 6 so that at least the guide lid member 6 does not fall out of the elastic member 7 by its own weight. It is set so as to be brought into sliding contact with frictional force. For example, as shown in FIG. 3B, the outer diameter of the engaging portion 7b is made to be in sliding contact with the inner wall surface of the guide column 6b of the guide lid member 6.

  In addition, if the inner diameter of the guide pillar 6b is set in accordance with the wire diameter of the coil spring 7 and slidably contacts with each other so that the guide lid member 6 does not fall off from the engaging portion 7b, these are all reduced. It can be handled as one part, which is convenient when assembling the nozzle.

  That is, when the nozzle 1 is assembled, the coil spring 7 and the guide lid member 6 are inserted in advance on the nozzle body 2 side, and the valve 5 is connected to the nozzle nipple 3 side projection 3b. And the nozzle nipple 3 can be completed by inserting the nozzle nipple 3 into the nozzle body 2. Thus, the assembly work is simplified.

  As shown in FIG. 2, the connection between the nozzle body 2 and the nozzle nipple 3 is achieved by press-fitting / fitting between the engagement protrusion 3a and the engagement hole 2a. This eliminates the need for such welding.

  In the nozzle 1 employing such a check tube structure for a flow path cylinder, if cleaning liquid or the like is supplied at a high pressure, as shown in FIG. 3 (B) from the non-supply state shown in FIG. 3 (A). The guide lid member 6 is pushed upward in the drawing against the urging force of the coil spring 7 by water pressure. As a result, the cleaning liquid enters the inner space 4a from the lower flow path 5b, passes through the gap on the side of the flat plate 6a, rises from the gap between the ribs 6c on the inner side of the guide column 6b, and the coil push ring. It flows out upward through the inside of 7.

  Further, a part of the cleaning liquid that has entered the inner space portion 4a advances around the valve 5, but there is a sealing projection 2c on the mating surface of the flange 5a and the body 2 to prevent leakage. . Further, leakage of the cleaning liquid from the gap between the nipple 3 and the valve 5 is prevented by the ring-shaped protrusion 5c. Since the valve 5 is strongly pressed upward by the nipple 3 fitted to the body 2 and maintained in a slightly crushed state, leakage of cleaning liquid or the like is prevented.

  As described above, the check valve structure of the flow path cylinder according to the present invention is not limited to the use example of the washer nozzle, and in addition, various injection devices that pump high-pressure supply liquid in one direction, It can be widely used in the middle of the flow path for supplying the supply liquid to various tanks.

It is a disassembled perspective view of the nozzle 1 which has the non-return valve structure of the cylinder for flow paths which concerns on this invention. It is the side view (A) of the nozzle 1 which has the non-return valve structure of the cylinder for flow paths of the same invention, and sectional drawing (B) along the AA line. It is the nozzle 1 which has the non-return valve structure of the cylinder for flow paths which concerns on the same invention, and is a partially expanded sectional view of the state in which supply liquid is not supplied. It is the nozzle 1 which has the non-return valve structure of the cylinder for flow paths which concerns on the same invention, and is a partially expanded sectional view of the state in which supply liquid is pumped and supplied. It is sectional drawing at the time of applying the check valve structure of the cylinder for flow paths concerning the same invention to the check valve for washer nozzles, such as a motor vehicle, as an example. It is explanatory drawing (A) which shows the check valve structure of the washer nozzle concerning a prior art example in a section, and explanatory drawing (B) which shows the check valve structure of the washer nozzle concerning a prior art example in a section.

Explanation of symbols

1 washer nozzle,
2 body, 2a engagement hole,
2b step, 2c protrusion,
2d step,
3 nipple, 3a engaging protrusion,
3b projection for connection,
4 connection fixing part, 4a inner space part,
5 valve, 5a flange,
5b channel, 5c protrusion,
6 guide lid member, 6a flat plate,
6b guide pillar,
7 elastic member, 7a flow path,
7b engaging portion,
16 Lower body,
17 Upper body,
18 O-ring valve, 18a fixed part,
19 elastic member,
20 Disc,
21 Filter.

Claims (3)

A check valve structure of a flow path cylinder that prevents a back flow of the supply liquid supplied to the flow path,
The channel cylinder is composed of a body and a nipple which are two cylindrical divided bodies having a channel for supplying liquid,
The body and the nipple are connected and fixed to each other by a connecting and fixing means in the connecting portion,
From the nipple side in the inner space of the connecting part,
A valve made of a cylindrical elastic body having a ring-shaped flange interposed on the mating surface of the connecting portion and having a flow path provided in the central portion;
A guide column that slides along the wall surface of the inner space portion on the back side of the flat plate member has a flat plate member that covers the open end of the cylindrical elastic body of the valve via a rib that connects to the flat plate member. A guide lid member provided at intervals in the circumferential direction;
An elastic member having a reaction force on the side of the body and securing a flow path in the central portion so as to always urge the guide lid member in the closing direction;
A check valve structure for a flow path cylinder. A ring-shaped flange of the valve is interposed on the mating surface of the connecting and fixing part of the body and nipple, and a ring-shaped projection for sealing is provided on the mating surface,
The check valve structure for a flow path cylinder according to claim 1. One end portion of the elastic member is engaged with the guide column of the guide lid member, and at least the guide lid member is slidably engaged with the elastic force so as not to come off from the elastic member by its own weight.
The check valve structure for a flow path cylinder according to claim 1 or 2.

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