JP2001343078A - Check value - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check value which can block an interconnecting aperture securely by a valve body. SOLUTION: In the check value 10, a plurality of convex parts 120 are formed with predetermined spacing along the circumferential direction in the inner surface of a valve accommodation potion 116 wherein a spherical valve 118 is restricted radically in the inward displacement within the valve accommodation portion 116 by the interference with the leading edges of the convex parts 120 and an alignment thereof with a central axis of interconnecting aperture 136 is approximately maintained all the time. On this account, under the condition that the spherical valve 118 is pressed firmly against a seal 138, a port of the seal 138 which is coaxial with the interconnecting aperture 136 is securely closed, then the interconnecting aperture 136 is securely blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, a cleaning liquid supplied from a pump between a nozzle for injecting a cleaning liquid for removing dirt from a headlamp of a vehicle and a pump for supplying the cleaning liquid to the nozzle. The present invention relates to a check valve for supplying a cleaning liquid to a nozzle in a state where the liquid pressure has reached a predetermined value or more.

[0002]

2. Description of the Related Art As a mechanism for removing dirt adhering to a headlamp of a vehicle, an injection nozzle for a cleaning liquid is provided in the vicinity of the headlamp, and the dirt is removed by spraying the cleaning liquid from the injection nozzle onto the surface of the headlamp. There is a mechanism, an example of which is disclosed in Japanese Utility Model Laid-Open Publication No. 1-142359. Hereinafter, the injection nozzle disclosed in Japanese Utility Model Laid-Open No. 1-142359 (referred to as a washer nozzle in Japanese Utility Model Laid-Open No. 1-142359) will be briefly described.

[0003] As shown in FIG.
0 is composed of an upper body 412 and a lower body 414. A part of the upper body 412 is exposed to the outside of the vehicle, and a nozzle body 416 having an injection port is provided at a portion of the upper body 412 exposed to the outside of the vehicle. Nozzle body 416
Is connected to the communication hole 418 at one end of the communication hole 418 formed in the upper body 412. The communication hole 418 is opened at the base of the upper body 412 (portion not exposed to the outside of the vehicle).

On the other hand, the lower body 414 has one end fitted into the base of the upper body 412, the other end connected to a hose or the like, and connected to a motor pump or a tank for storing a washing liquid via the hose or the like. I have.

The lower body 414 has one end communicating with the communicating hole 418 and the other end communicating with the above-mentioned hose or the like.
0 is formed, and the cleaning liquid that has passed through the hose or the like is ejected from the nozzle body 416 through the communication holes 420 and 418.

[0006] A compression coil spring 422 is accommodated in the communication holes 418 and 420, and an opening diameter at the other end of the communication hole 420 is provided between the compression coil spring 422 and the other end of the communication hole 420. A valve ball 424 having a larger diameter than the dimensions is arranged. The valve ball 424 is urged toward the other end of the communication hole 420 by the urging force of the compression coil spring 422, and normally closes the other end of the communication hole 420,
When the water pressure of the cleaning liquid supplied from a hose or the like exceeds the urging force of the compression coil spring 422, the valve ball 424 moves to one end of the communication hole 420 to open the other end of the communication hole 420. .

Further, as shown in FIG. 12, in the injection nozzle 410, a plurality of ridges 426 are formed on the inner peripheral portion of the communication hole 420, and these ridges 426 interfere with the valve ball 424. This prevents vibration of the valve ball 424.

[0008]

However, in the injection nozzle 410, although the protrusion 426 is formed to the extent that the vibration of the valve ball 424 can be limited, the clearance between the valve ball 424 and the communication hole 420 is absorbed. As shown in FIG. 12, the clearance between the valve ball 424 and the communication hole 420 remains, and the displacement itself of the valve ball 424 in a direction orthogonal to the axial direction of the communication hole 420 is possible. Also,
Even if the displacement of the valve ball 424 in the direction orthogonal to the axial direction of the communication hole 420 is almost completely restricted,
26 and the communication hole 42 depending on the shape and the like of the valve ball 424.
0 may be out of alignment, and in this case, the communication hole 4
Even if the valve ball 424 comes into contact with the inner wall of the communication hole 420 as if closing the other end of the communication hole 420, a gap is formed between the valve ball 424 and the other end of the communication hole 420. It may not be possible to completely close the end.

An object of the present invention is to provide a check valve capable of reliably closing a communication hole by a valve body in consideration of the above fact.

[0010]

According to a first aspect of the present invention, there is provided a check valve having a communication hole provided in a flow path of a fluid and communicating between the inside and the outside of the check valve. A cylindrical housing that passes through the communication hole, and is housed in the housing so as to be able to move toward and away from the communication hole in the direction of the flow of the fluid, and the communication hole is in a state of being closest to the communication hole. A valve body for closing and blocking the fluid, provided inside the housing,
An urging means for urging the valve body toward the communication hole; and a biasing means provided inside the housing, wherein the valve body is movable in a state where the valve body is separated from an inner peripheral portion of the housing, and the valve body is provided with the communication hole. Holding means capable of holding the valve body in a state in which the valve body is opposed to the communication hole so that the valve body can be closed.

In the check valve having the above-described structure, the valve element in the housing is brought closest to the communication hole of the housing by the urging force of the urging means, and the interposition between the communication hole and the communication hole and the valve element intervenes. When the object is pressed against the object, the communication hole is closed by the valve body, and the fluid does not flow from the communication hole into the interior of the housing. Therefore, the fluid does not flow to the flow path downstream of the housing.

When the pressure of the fluid exceeds the urging force of the urging means, the valve body is pressed and moved in a direction away from the communication hole by this pressure, whereby the communication hole is opened and the housing is opened from the communication hole. The fluid flows into the inside, and the fluid flows to a flow path downstream of the housing.

[0013] Here, holding means is provided inside the housing, so that the valve body is always separated from the inner peripheral portion of the housing. Therefore, when the valve body is separated from the communication hole, the valve is opened. Fluid passes between the body and the inner periphery of the housing and flows downstream.

Even if the valve body moves toward and away from the communication hole, the holding means always faces the communication hole along the moving direction of the communication hole. When the valve element is pressed against the inclusion, no gap is formed between the communication hole and the outer peripheral portion of the valve element.
This ensures that the communication hole is closed when the valve body is pressed against the communication hole or the inclusion near the communication hole by the urging force of the urging means.

According to a second aspect of the present invention, in the check valve according to the first aspect, the outer diameter of the valve body is formed in the communication hole or an interposition between the communication hole and the valve body. Along with forming a substantially spherical shape larger than the opening diameter of the hole, the opening axis of the communication hole and the hole of the inclusion located on the valve body side substantially coincides with the center of the valve body. The holding means holds the valve body.

In the check valve having the above-described structure, the valve body has a substantially spherical shape whose outer diameter is larger than an opening diameter of a hole formed in the communication hole or an intervening body interposed between the communication hole and the valve body. . Therefore, when the opening axis of the communication hole and the hole of the inclusion is located on the valve body side and the center of the valve body is aligned, the hole of the communication hole and the hole of the inclusion is located on the valve body side and comes into contact with the opening edge. For example, the communication hole is almost completely closed by the valve body.

Here, in the present invention, the holding means holds the valve body in a state where the opening axis of the communication hole or the hole of the inclusion is located on the valve body side and the center of the valve body is aligned. In addition, the valve body can be reliably brought into contact with the opening edge of the hole of the inclusion that is located on the valve body side.

According to a third aspect of the present invention, the check valve according to the first or second aspect is formed with a plurality of check valves at predetermined intervals along an inner circumferential direction of the housing. A plurality of projections projecting toward the center of the housing in the radial direction of the housing and integrally formed with the housing are used as the holding means.

In the check valve having the above structure, a plurality of convex portions as holding means are formed so as to protrude from the inner peripheral portion of the housing toward the inner side in the inner diameter direction of the housing. Is held. Therefore, when the valve element is separated from the communication hole, the fluid passes between the outer peripheral part of the valve element and the inner peripheral part of the housing and between the convex parts. That is, a space between the convex portions along the inner circumferential direction of the housing can be secured as a fluid flow path in the housing.

Further, by forming the projection integrally with the housing, there is an advantage that the projection can be easily formed without increasing the number of parts.

According to a fourth aspect of the present invention, the check valve has a communication hole provided in the fluid flow path and communicating between the inside and the outside.
A cylindrical housing through which the fluid that has entered from the outside through the communication hole passes through the interior, and is housed in the housing so as to be able to move toward and away from the communication hole along the direction of the flow of the fluid; A valve body that closes the communication hole by approaching the communication hole and blocks the fluid;
An urging means provided inside the housing and for urging the valve body toward the communication hole; and a valve body provided inside the housing of the communication hole and receiving the urging force of the urging means. And a valve seat that is elastically deformed by the pressing force.

In the check valve having the above-described structure, when the valve element in the housing is brought closest to the communication hole of the housing by the urging force of the urging means and pressed against the valve seat, the communication hole is closed by the valve element. Fluid does not flow into the housing from the communication hole, and therefore does not flow to the flow path downstream of the housing.

When the pressure of the fluid exceeds the urging force of the urging means, the valve body is pressed and moved in the direction away from the communication hole by this pressure, whereby the communication hole is opened, and the housing is opened from the communication hole. The fluid flows into the inside, and the fluid flows to a flow path downstream of the housing.

Here, when the valve body is pressed against the valve seat, the valve seat is elastically deformed, and the valve body and the valve seat come into close contact with almost no gap. Thereby, the communication hole can be more reliably closed.

According to a fifth aspect of the present invention, there is provided the check valve according to the first aspect of the present invention, wherein a first cylindrical housing accommodating the valve body and the urging means therein; A second housing having a bottomed cylindrical shape opened toward the downstream side of the fluid, the communication hole being formed in a bottom portion, and a second housing accommodating the first housing therein. Is characterized.

In the check valve having the above-described structure, the housing includes the first housing and the second housing, and the valve body in the first housing is separated from the communication hole formed in the bottom of the second housing. In the state, it flows into the inside of the first housing housed in the second housing from this communication hole, and further flows downstream.

Here, by configuring the housing including the first housing and the second housing as described above,
The housing of the valve element and biasing means in the housing becomes easy,
The assembly process of these members is simplified.

When the present invention is made dependent on claim 4, it is only necessary to dispose the valve seat on the inner bottom of the second housing (inside the second housing at the bottom). In addition, if the outer diameter of the valve seat at this time is made larger than the inner diameter of the first housing and the open end of the first housing on the bottom side is brought into close contact with the valve seat, the distance between the first housing and the valve seat can be increased. Gap can be eliminated.

According to a sixth aspect of the present invention, in the check valve according to the fifth aspect, the first housing is integrally connected to the second housing while the first housing is housed in the second housing. The connecting means is provided on at least one of the first housing and the second housing.

In the check valve having the above-mentioned structure, the first housing and the second housing are integrally connected by the connecting means when the first housing is housed in the second housing. Therefore, in this state, the first housing does not fall out of the second housing. Moreover,
Since the connecting means is provided on at least one of the first housing and the second housing, it is not necessary to separately provide a connecting member for connecting the first housing and the second housing. The increase can be prevented and the cost can be reduced.

According to a seventh aspect of the present invention, there is provided a check valve according to the sixth aspect of the present invention, wherein an engagement piece provided on one of the first housing and the second housing, and the first housing and the second housing are provided. In a state where the first housing is housed in the second housing provided in one of the other two housings, the first housing is opposed to the engaging piece along the housing direction and the opposite direction, and in a direction opposite to the housing direction. And an engaging wall which interferes with the engaging piece when the second housing is displaced, and wherein the connecting means is constituted.

In the check valve having the above configuration, when the first housing is housed in the second housing, an engagement piece provided on one of the first housing and the second housing includes:
The engaging wall provided on one of the other faces the housing in the second housing in the housing direction when the first housing is housed and in the opposite direction, whereby the first housing and the second housing are opposed to each other. Are integrally connected. In this state, when the second housing attempts to displace in the direction opposite to the housing direction, the engaging wall interferes with the engaging piece, and restricts the displacement of the second housing. As described above, basically, the first housing and the second housing can be connected only by housing the first housing in the second housing, and the assembly process of the first housing and the second housing is further simplified. Is done.

The check valve according to claim 8 is the invention according to any one of claims 5 to 7, wherein at least one of an outer peripheral portion of the first housing and an inner peripheral portion of the second housing. Wherein the first housing is housed in the second housing, and the first housing is in close contact with one of the other to seal between the second housing and the other.

According to the check valve having the above structure, the second
In a state where the first housing is housed in the housing, the sealing means provided on at least one of the outer peripheral portion of the first housing and the inner peripheral portion of the second housing is in close contact with one of the other, and The space between the outer periphery of the first housing and the inner periphery of the second housing is sealed. For this reason, even if the fluid that has flowed out of the second housing through the communication hole flows out of the first housing, it does not leak out of the entire housing as long as it flows out of the entire housing.

[0035]

FIG. 1 is an exploded perspective view in which a check valve 10 according to an embodiment of the present invention is applied to a movable nozzle 12, and FIG.
FIG. 2 shows a sectional view of the movable nozzle 12.

Prior to the description of the check valve 10, the overall configuration of the movable nozzle 12 will be described.

(Structure of Frame 18) As shown in FIGS. 1 and 2, the movable nozzle 12 has a frame 18 constituted by a pair of frame parts 14 and 16. The frame part 14 of the frame 18 has a cross section cut along a direction perpendicular to the longitudinal direction and has a substantially semicircular cross section. At one end in the longitudinal direction, a substantially semicircular vertical wall 20 is formed. Is formed. Also, frame parts 1
A substantially rectangular plate-like mounting piece 22 extends from the other end in the longitudinal direction of 4 at right angles to the longitudinal direction of the frame part 14 and toward the outside of the frame part 14.
One or more through holes 24 are formed in the mounting piece 22 in the thickness direction thereof, and fastening means such as bolts pass through these through holes 24. The fastening means passing through the through hole 24 is also fastened and fixed through a through hole (both not shown) formed in a support provided near the headlight of the vehicle, for example.

On the other hand, the frame part 16 also has a substantially semicircular cross section like the frame part 14, and has a vertical wall 26 formed at one longitudinal end and a mounting piece 28 formed at one longitudinal end. I have. In the vicinity of both ends in the width direction (circumferential direction) of the frame part 16 and in the vicinity of the end of the vertical wall 26 on the side that is not in contact with the curved portion of the frame part 16, the thickness is formed smaller than the other parts. Inside the frame part 16, this thin portion forms a step 30.

The step 30 has a thin fitting extending from both ends in the width direction (circumferential direction) of the frame part 14 and the end of the vertical wall 20 on the side not in contact with the curved portion of the frame part 14. The piece 32 fits. Fitting piece 32 is step 3
0, each frame part 14, 1
6 is substantially cylindrical in cross section taken along a direction perpendicular to the longitudinal direction, and the vertical wall 20 and the vertical wall 26 are the bottom 34 at one axial end of the frame 18 and the mounting piece 2.
It has a substantially bottomed cylindrical shape with open ends on the sides 2 and 28.

The outer periphery of the frame part 14 has a substantially half-ring shape (a shape obtained by dividing a substantially circular ring into two).
1 to a plurality of fixing portions 36 are formed along the longitudinal direction of the frame part 14. Engaging claws 38 extend from both ends in the circumferential direction of the fixing portion 36 in the tangential direction to the inner and outer circumferences of the fixing portion 36 and in the opening direction of the frame part 14.
Are formed to protrude.

On the other hand, a substantially semi-ring-shaped fixing portion 40 is formed on the outer peripheral portion of the frame part 16 so as to correspond to the fixing portion 36 described above. At both ends in the longitudinal direction of the fixing portion 40, a substantially rectangular plate-shaped fixing piece 42 extends outward of the frame part 16. These fixing pieces 42 have rectangular engaging holes 44 penetrating in the thickness direction (more specifically, the protruding direction of the engaging claws 38 in a state where the frame parts 14 and the frame parts 16 are fitted). When the frame parts 14 and the frame parts 16 are fitted, the engagement claws 38 are fitted with the engagement holes 44 penetrating therethrough, and the frame parts 14 are moved away from the frame parts 16. Restrict movement.

In this embodiment, the fixing portions 36, 4
0 was formed on the frame parts 14 and 16 (ie,
The fixing part 36 is formed integrally with the frame part 14 in advance,
Although the fixing portion 40 is formed integrally with the frame parts 16 in advance, the fixing portions 36 and 40 may be formed separately from the frame parts 14 and 16. However, the configuration in which the fixing portions 36 and 40 are formed on the frame parts 14 and 16 has an advantage that the number of parts does not need to be increased, and the work of attaching the fixing portions 36 and 40 to the frame parts 14 and 16 is not required. There is also an advantage that it can be omitted.

Further, a pair of drain holes 46 and 48 are formed in the frame part 16. The drain hole 46 penetrates the inner peripheral side and the outer peripheral side of the frame part 16 at an intermediate portion in the axial direction (longitudinal direction) of the frame part 16, and the drain hole 48 is formed on the vertical wall 26 side of the frame part 16. 16 penetrates the inner peripheral side and the outer peripheral side. Drain hole 4
6 and 48 are holes that penetrate substantially vertically in a state where the frame 18 is assembled at a predetermined position of the vehicle body.

Further, one or more engaging claws 50 are formed on the mounting piece 22 described above. The engagement claw 50 has a base end on the back surface (the surface on the bottom portion 34 side) of the attachment piece 22 and the attachment piece 2.
2, and the tip is closer to the mounting piece 28 than the end of the outer peripheral end of the mounting piece 22 that is in contact with the mounting piece 28 when the frame parts 14 and 16 are fitted together. Protruding toward.

An engagement hole 52 is formed in the mounting piece 28 corresponding to the engagement claw 50. The engagement hole 52 is attached to the mounting piece 28.
A rectangular hole penetrating in the thickness direction of the frame part 14
Is engaged with the frame part 16,
Of the engaging claw 50 in the direction in which the frame part 14 is separated from the frame part 16.

The movable cylinder 60 is housed inside the frame 18 having the above-described structure.

(Structure of Movable Cylinder 60) The outer diameter of the movable cylinder 60 is sufficiently smaller than the inner diameter of the frame 18, and the end opposite to the bottom 34 of the frame 18 is substantially a bottom 62. It is formed in a bottom cylindrical shape.
The mounting pieces 22 and the mounting pieces 28 corresponding to the movable cylinders 60 have substantially semicircular cutouts 64 and 66, respectively.
Are formed. When the frame parts 14 and 16 are fitted, the cutout portion 64 and the cutout portion 66 form a circular hole 68 whose inner diameter is slightly larger than the outer diameter of the movable cylinder 60, and the movable cylinder 60 passes through the circular hole 68. To extend outside the frame 18.

As shown in FIGS. 1 and 3, on the outer peripheral portion of the movable cylinder 60, a rib 70 elongated along the axial direction of the movable cylinder 60 is formed. This rib 7
A groove 72 is formed in the notch 64 corresponding to 0.
At least when the movable cylinder 60 passes through the circular hole 68, the rib 70 passes through the inside of the groove 72.

In this embodiment, the number of the ribs 70 and the number of the grooves 72 are one. However, as shown in FIG. The rib 70 is formed at every 90 degrees, and the groove 72 is formed in the inner peripheral portion of the circular hole 68 (that is, the notch portions 64 and 66).
May be formed.

As shown in FIGS. 1 and 2, a flange 74 is formed on the open end side of the movable cylinder 60. The flange 74 has a ring shape as a whole, and its outer diameter is sufficiently larger than the outer diameter of the movable cylinder 60 and slightly smaller than the inner diameter of the frame 18. That is, the inner peripheral portion of the above-described circular hole 68 limits the radial displacement (displacement in the direction perpendicular to the axial direction of the movable cylinder 60) of the movable cylinder 60 (that is, the movable cylinder 60) on the bottom 62 side. At the same time, the inner peripheral portion of the frame 18 interferes with the flange 74 to limit the displacement of the movable cylinder 60 in the radial direction (displacement in the direction perpendicular to the axial direction of the movable cylinder 60). Therefore, basically, the direction of movement of the movable cylinder 60 is limited to the direction along the opening direction (axial direction) of the frame 18.

The mounting pieces 22, 2 inside the frame 18 are also provided.
A cup 76 is housed on the 8 side. The outer diameter of the cup 76 is slightly smaller than the inner diameter of the frame 18,
The inner diameter is a cylindrical shape with a bottom that is sufficiently larger than the outer diameter of the movable cylinder 60, and its open end is the bottom 3 of the frame 18.
It is facing 4 side. A hole larger than the outer diameter of the movable cylinder 60 is formed at the bottom of the cup 76, and the movable cylinder 60 penetrates this hole.

A compression coil spring 78 is disposed outside the movable cylinder 60 and inside the frame 18. Assuming that the compression coil spring 78 has a cylindrical shape, the outer diameter is slightly smaller than the inner diameter of the cup 76 and the inner diameter is larger than the outer diameter of the movable cylinder 60. One end of the compression coil spring 78 is in contact with the bottom of the cup 76 to press the cup 76 against the mounting pieces 22 and 28, and the other end is in contact with the flange 74 to press the bottom of the frame 18 toward the bottom 34. . Since the cup 76 cannot basically move due to contact with the mounting pieces 22 and 28, the compression coil spring 78 consequently causes the movable cylinder 60 (that is, the movable cylinder 60 ) Is urged toward the bottom 34 side.

As shown in FIG. 2, an annular groove 80 is formed in the inner peripheral portion of the above-described flange 74, and rubber or a relatively soft and elastic synthetic resin material is formed inside the annular groove 80. The formed ring-shaped O-ring (O-ring) 82 is arranged. Further, a fixed piston 84 is housed inside the movable cylinder 60.

(Structure of Fixed Piston 84) FIGS. 1 and 2
As shown in FIG. 7, the fixed piston 84 has a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the movable cylinder 60. Therefore, the displacement of the movable cylinder 60 is also limited only in its own axial direction by the fixed piston 84.

In the outer peripheral portion of the fixed piston 84,
The above-described O-ring 82 is in pressure contact with a portion corresponding to the above-described flange 74. The O-ring 82 is elastically deformed and pressed against and adheres to both the bottom of the groove 80 and the outer periphery of the fixed piston 84 to seal between the inner periphery of the movable cylinder 60 and the outer periphery of the fixed piston 84. .

Fixed piston 84 on the bottom side of frame 18
Is formed with an annular groove 86 in the outer peripheral portion thereof. This groove 8
A notch 88 having a semicircular diameter is formed in the vertical wall 20 of the frame part 14 corresponding to the portion 6, and a notch 90 having a semicircular diameter is formed in the vertical wall 26 of the frame part 16. . These cutouts 88 and 90 become circular holes 92 in the bottom 34 in a state where the frame parts 14 and 16 are fitted together. The inner diameter of the circular hole 92 is slightly larger than the outer diameter of the main body in the groove 86, and the fixed piston 84 passes through the circular hole 92 at the groove 86.

The bottom portion 34 of the frame 18 has a circular hole 9.
An annular step 94 concentric with 2 is formed. In this step 94, the thickness of the bottom portion 34 is thinner than other portions. A ring-shaped seal 96 is fitted into the step 94.
One end surface of the seal 96 is in close contact with the step portion 94, and the other end surface is in close contact with the inner wall of the groove 86 on the side facing the step portion 94 and the bottom of the groove 86 to seal the circular hole 92. I have.

Further, the frame 18 extends through the circular hole 92.
A connecting portion 98 is formed at one end of the fixed piston 84 exposed to the outside. The connecting portion 98 is a fixed piston 84
An engagement ring 10 having a sufficiently smaller outer diameter than the fixed piston 84 and having a cylindrical shape coaxial with the fixed piston 84 and having an outer peripheral portion whose outer size gradually decreases toward the opposite side to the fixed piston 84.
0 is formed.

The engagement ring 100 has an inner diameter of the connecting portion 98.
When the connecting portion 98 is inserted inside a tubular member (not shown) such as a hose or a tube having an outer diameter dimension of approximately, the engagement ring 100 bites into the inner peripheral portion of the tubular member and the connecting portion 98
Is prevented from coming off the tubular member. The tubular member (not shown) is directly or indirectly connected to a motor pump and a tank (not shown) in which the cleaning liquid is stored, on the opposite side to the connecting portion 98, and the inside of the tank is operated by operating the motor pump. The cleaning liquid is supplied to the tubular member, and further supplied to the inside of the connecting portion 98.

The fixed piston 84 has a supply hole 102 formed therein. One end of the supply hole 102 communicates with the inside of the connecting portion 98, and the other end is opened at the end of the fixed piston 84 on the bottom 62 side of the movable cylinder 60.

(Configuration of Nozzle 110 and Check Valve 10) On the other hand, as shown in FIG. 1 and FIG.
0 is provided. The nozzle 110 is formed in a substantially hemispherical shape, and an injection port 112 is formed on a part of the outer periphery. The nozzle 110 has a body 114 that forms the check valve 10 as a first housing that is a component of the housing.

As shown in FIGS. 2 and 5, the body 1
Reference numeral 14 denotes a substantially cylindrical shape having an outer diameter smaller than the outer diameter of the movable cylinder 60 described above, and a valve housing portion 116 is formed inside thereof.

As shown in FIG. 6, the valve accommodating portion 116 is a bottomed hole opened at the axial end of the body 114 on the side opposite to the main body portion (substantially hemispherical portion) of the nozzle 110. And a spherical valve 118 as a valve body is housed inside. The spherical valve 118 has a spherical outer shape, and its outer diameter is sufficiently smaller than the inner diameter of the valve housing 116.

Further, a plurality of convex portions 120 as holding means are formed to protrude from the inner peripheral portion of the valve housing portion 116 toward the axis of the valve housing portion 116. Each projection 120 has a rod-like or plate-like shape extending longitudinally along the axial direction of the valve housing 116 and is formed at predetermined intervals along the inner circumferential direction of the valve housing 116. The diameter of a virtual circle passing through the tips of these projections 120 (ends on the axial center side of the valve housing portion 116) is as follows:
Slightly larger than the outer diameter of the spherical valve 118 described above,
The spherical valve 118 is movable along the axial direction of the valve housing 116 in such a state that displacement of the spherical valve 118 in the direction perpendicular to the axial direction of the valve housing 116 is restricted by the tips of the convex portions 120. 116.

Here, as described above, the plurality of convex portions 120 are formed.
Are formed at predetermined intervals along the inner circumferential direction of the valve housing portion 116, so that a gap is formed between the adjacent convex portions 120 along the inner circumferential direction of the valve housing portion 116. These gaps serve as a cleaning liquid flow path 122, through which the above-described cleaning liquid flows.

Each of the protrusions 120 has a spring holding piece 124 formed continuously on the bottom side of the valve housing 116. The spring holding piece 124 basically has
A rod-shaped portion or a plate-shaped portion formed to protrude from the inner peripheral portion of the valve housing portion 116 toward the axis of the valve housing portion 116 in the same manner as described above. Part 1
An imaginary circle larger than 20 and passing through the distal end of the spring holding piece 124 is substantially coaxial with the valve accommodating portion 116, but has a smaller diameter than the outer diameter of the spherical valve 118.
Therefore, the spherical valve 118 cannot basically move to the spring holding piece 124 side with respect to the projection 120.

Although the projection 120 and the spring holding piece 124 have been described as separate parts with respect to the spring holding piece 124, this is described as a separate part for convenience in terms of function. Of course, the spring holding piece 124 and the projection 120 may be formed as truly separate parts, but as shown in FIG.
It is sufficient if only the protrusion of the part 0 (the part on the bottom side of the valve housing part 116) from the inner periphery of the valve housing part 116 is increased.

Further, as shown in FIG. 5, a compression coil spring 126 as an urging means is accommodated inside the valve accommodating portion 116. Compression coil spring 12
6 is the diameter of an imaginary circle whose inner diameter is sufficiently smaller than the outer diameter of the spherical valve 118 and whose outer diameter passes through the tip of the spring holding piece 124 when the shape is regarded as a cylindrical shape. Slightly smaller than.

The compression coil spring 126 is mounted on the spherical valve 11.
8 and the bottom of the valve housing 116, one end of which is in contact with the spherical valve 118, and the other end thereof enters the spring holding piece 124 side of the valve housing 116, and The spherical valve 118 is in contact with the bottom to urge the spherical valve 118 toward the open end of the valve housing 116. As described above, when the shape of the compression coil spring 126 is assumed to be a cylinder, the outer diameter is slightly smaller than the diameter of an imaginary circle passing through the tip of the spring holding piece 124. The distal end of the spring holding piece 124 limits the displacement of the valve housing 116 along the inner diameter direction.

The body 11 is provided inside the body 114.
A cleaning liquid flow path 128 is formed coaxially with the outer peripheral portion of No. 4. The cleaning liquid flow path 128 is substantially coaxial with the valve housing 116, and has an inner diameter smaller than the diameter of the imaginary circle passing through the tip of the spring holding piece 124. On the other hand, the other end of the cleaning liquid channel 128 is bent on the main body side of the nozzle 110 and communicates with the injection port 112.

Further, an annular groove 130 is formed in the outer peripheral portion of the body 114, and a ring-shaped O-ring (O-ring) made of rubber or a relatively soft and elastic synthetic resin material is formed in the groove 130. Ring) 132 is fitted.

The movable cylinder 60 corresponding to the body 114 is provided with a cylindrical body 134 constituting a housing as a second housing. The tubular body 134 is a bottomed cylindrical portion formed coaxially with the movable cylinder 60 outside the movable cylinder 60 and the bottom and having the bottom 62 of the movable cylinder 60 as a bottom. Slightly larger than the body 114 inside
Can be inserted. Further, a through hole 136 as a communication hole penetrating along the thickness direction of the bottom portion 62 is formed substantially at the center of the bottom portion 62 of the movable cylinder 60, and the inside of the cylindrical body 134 and the inside of the movable cylinder 60 communicate with each other. ing. Therefore, when the body 114 is inserted into the cylinder 134,
The movable cylinder 60 and the valve housing portion 116 can communicate with each other through the inside of the cylindrical body 134 and the cylindrical body 134.
8 (ie, the center of the spherical valve 118 is located substantially on an imaginary extension of the axis of the through hole 136). Also,
The above-described O-ring 132 is elastically deformed by the pressing force from the bottom of the groove 130 and the inner peripheral portion of the cylinder 134 when the body 114 is inserted into the cylinder 134, and the bottom of the groove 130 and the cylinder 1
34, the outer peripheral portion of the body 114 and the cylinder 1
A seal is made between the inner peripheral portion of the valve and the inner peripheral portion of the valve.

Further, the inside of the cylindrical body 134 is formed of rubber or a relatively soft and elastic synthetic resin material, and the inclusions according to the present invention according to claim 1 and the present invention according to claim 4 are formed. The valve seat and the seal 138 corresponding to the sealing means according to the present invention are arranged. The seal 138 has a spherical valve 118 having an inner diameter dimension.
Is a ring-shaped member formed coaxially with the through hole 136. The outer diameter is slightly smaller than the inner diameter of the cylinder 134,
Is sufficiently larger than the inner diameter of. Therefore, the cylindrical body 13
When the body 114 is inserted into the body 4, at least the body 1 is sandwiched between the bottom 62 and the axial end face of the body 114.
The portion corresponding to the end face of 14 is in close contact with the bottom 62 on the bottom 62 side, and is in close contact with the end face of the body 114 on the body 114 side.

On the other hand, from the opening edge of the cylinder 134, the cylinder 1
A pair of nozzle holding claws 140 are formed as connecting means extending so as to face each other in the radial direction of 34.
Each nozzle holding claw 140 has a base 142 that is thinner than the cylindrical body 134. One end of the base 142 is the cylindrical body 13.
4 is connected to the opening edge of the cylindrical body 134 at the radially outer portion, and therefore, as shown in FIG. 5, the interval between the paired base portions 142 is the inner diameter of the cylindrical body 134. The step is larger in the radial direction of the cylindrical body 134 between the base 142 and the inner peripheral part of the cylindrical body 134.

At the other end of the base 142, a claw 144 corresponding to the engagement piece according to the seventh aspect is formed.
The pawl 144 is thicker than the base 142 on the side of the connection with the base 142, and in this portion, the interval between the paired claws 144 is larger than the interval between the paired bases 142. However, the claws 144 are gradually thinner toward the distal end side,
The end face of each claw 144 along the radius inner side of the cylinder 134 has a slope 146 inclined in a direction along the opening direction of the cylinder 134.
It has become.

A ring-shaped engagement ring 148 as an engagement wall is integrally formed on the outer peripheral portion of the body 114 corresponding to the nozzle holding claw 140 having the above-described structure. The engagement ring 148 has an axial dimension of the cylindrical body 13.
4 to the claw 144 (that is, the cylinder 1
34 is slightly smaller than the length of the base portion 142 along the axial direction of the body 114, and a part of the body 114 is formed in a state where the end face of the body 114 is in close contact with the seal 138.
Along the radial direction of, it faces the base 142 and enters between the opening edge of the cylindrical body 134 and the claw 144.

In the present embodiment, the main body (substantially hemispherical portion) of the nozzle 110 and the body 114 are basically integrally formed.
May be configured separately from the main body portion and the body 114 so as to be integrally connected later. One example is
There is a configuration in which a male screw portion is formed on one of the main body portion and the body 114 of the nozzle 110, a female screw portion is formed on one of the other, and the nozzle 110 is assembled by screwing the male screw portion and the female screw portion. .

As described above, when the main body of the nozzle 110 and the body 114 are formed separately, there is a disadvantage that the number of assembling steps is increased, but the specification of the vehicle, for example, with respect to the installation position of the movable nozzle 12, Various nozzles 110 in which the position of the injection port 112 is changed according to the position of the headlight
If you prepare the nozzle 11 even if the model is different
If parts other than 0 can be shared, or if various nozzles 110 having different jetting modes of the cleaning liquid jetted from the jet port 112 are prepared, the nozzles 110 are appropriately replaced, and the jetting jet most suitable for the use environment of the vehicle and the like is performed. There are advantages such as being able to be in an aspect.

<Operation and Effect of the Present Embodiment> Next, the operation and effect of the present embodiment will be described from both the assembly side (manufacturing side) and the operation side of the movable nozzle 12.

(Assembling Step of the Movable Nozzle 12) When assembling the movable nozzle 12, first, the fixed piston 84 is inserted from the open end of the movable cylinder 60 in the piston-cylinder assembling step. Before and after this piston-cylinder assembling step, the movable cylinder 60
A cup 76 and a compression coil spring 78 are attached to the outside of the. This spring mounting process and piston
After the end of the cylinder assembling step, one end of the compression coil spring 78 contacts the inner bottom of the cup 76, and the other end of the compression coil spring 78 contacts the flange 74 of the fixed piston 84.

The body 114 of the nozzle 110 is inserted into the cylinder 134 in the nozzle mounting step before and after the piston-cylinder mounting step and the spring mounting step.
When the body 114 is inserted into the cylinder 134, the cylinder 13
With the body 4 and the body 114 being substantially coaxial, the body 114 is relatively approached to the cylinder 134 substantially along its axis, and the body 114 is inserted into the cylinder 134. When the predetermined length body 114 is inserted into the cylinder 134,
The engagement ring 148 formed on the inclined surface 146 of the claw 144
Abut. Since the slope 146 is inclined in the direction along the opening direction of the cylinder 134 with respect to the radially inward side of the cylinder 134, the force in the direction along the axis of the body 114 and the cylinder 134 is applied to the engagement ring 148. Claw 144 received from base 14
It elastically deforms so as to rotate around the connection portion with the second cylinder 134 so as to move away from the axis of the body 114 and the cylinder 134. When the body 114 is further inserted into the cylindrical body 134 from this state, the claw 144 rides on the outer peripheral surface of the engagement ring 148, and further, the nozzle 110
The claw 144 is located on the main body side of the
The nozzle holding claw 140 is restored to the original shape by the elasticity of the nozzle. In this restored state, the end face of the claw 144 on the bottom 62 side and the end face of the engagement ring 148 on the main body side of the nozzle 110 face each other along the axial direction of the body 114 and the cylinder 134. Therefore, when the body 114 is to be pulled out of the cylinder 134 in this state, the pawl 144 interferes with the engagement ring 148 and the removal of the body 114 from the cylinder 134 is restricted. Thereby, the cylindrical body 134 and the body 1
14 are integrally connected.

After the piston-cylinder assembling step and the spring mounting step are completed, the movable cylinder 60 and the fixed piston 84 are housed inside the frame 18 in the piston-cylinder housing step.

In the piston-cylinder housing step, the movable cylinder 60 is housed inside one of the divided frame parts 14 and 16. At this time, the outer bottom of the cup 76 is brought into contact with the mounting piece 22 or the mounting piece 28 of the frame parts 14 and 16 on the side where the movable cylinder 60 is accommodated. When the movable cylinder 60 is housed in one of the frame parts 14 and 16, the groove 86 of the fixed piston 84 is inserted into the cutout 88 or the notch on the frame part 14 or 16 on the side where the movable cylinder 60 is housed. The part 90 is fitted.

Next, the frame part 14 and the frame part 16 are moved closer to each other with the substantially semicircular openings each having a sectional shape facing each other. When the frame part 14 and the frame part 16 approach each other by a predetermined distance, the fitting piece 32 of the frame part 14 fits into the step 30 of the frame part 16. At this time,
The engaging claw 38 of the fixing portion 36 penetrates the engaging hole 44 of the fixing piece 42. In a state where the engaging claw 38 penetrates the engaging hole 44,
The end face of the engaging claw 38 on the body part side of the frame part 14 faces the end face of the mounting piece 28, and if the frame part 14 is to be relatively separated from the frame part 16, the end face of the engaging claw 38 and the mounting piece 28 Interfere with each other. Thereby, the mechanical connection between the frame parts 14 and the frame parts 16 is maintained.

When the fitting piece 32 of the frame part 14 fits into the step 30 of the frame part 16, the engaging claw 50 of the mounting piece 22 rides on the mounting piece 28 and is elastically deformed. When the mating piece 32 is fitted, the engaging hole 52 and the engaging claw 50 face each other along the axial direction of the frame 18, and the elasticity of the engaging claw 50 restores the engaging claw 50 to its original shape. While entering the engagement hole 52. When the frame part 14 is to be relatively separated from the frame part 16 in this state, the end face of the engaging claw 50 on the mounting piece 22 side and the engaging hole 5
2 interfere with each other. Therefore, the mechanical connection between the frame parts 14 and the frame parts 16 is maintained by this as well.

The movable nozzle 12 having undergone the above-described steps is connected to the motor pump and the tank by connecting the above-mentioned tubular member to the connecting portion 98, and the mounting pieces 22, 28 are fixed to the vehicle body.

Here, as described above, the main movable nozzle 1
At the time of assembling 2, the members to be substantially integrated are connected with each other by fitting the engagement ring 148 and the claw 144, fitting the fitting piece 32 to the step 30, and fitting the engagement claw 38 to the engagement hole 44. And the engagement between the engagement claw 50 and the engagement hole 52, etc., without using any fastening means such as screws or bolts, adhesives, or the like. The movable nozzle 12 can be easily assembled without any skill. Therefore, the assembling process can be simplified, and another member or a special device for fixing and fastening is not required, so that the assembling cost can be reduced.
2 can reduce the manufacturing cost.

(Operations and Effects from the Operating Surface of the Movable Nozzle 12) Next, the operations and effects of the movable nozzle 12 and the check valve 10 as viewed from the operating surface will be described.

When the motor pump provided on the side of the tank storing the cleaning liquid is operated to suck up the cleaning liquid from the tank, the cleaning liquid is sent to a tubular member such as a hose or a tube at a water pressure corresponding to the output of the motor pump. Further, the cleaning liquid that has passed through the tubular member is
That is, it is supplied to the inside of the movable cylinder 60 through the supply hole 102.

On the other hand, outside the through hole 136 of the movable cylinder 60 (ie, on the side of the cylinder 134), the spherical valve 118 is pressed against the hole of the seal 138 by the urging force of the compression coil spring 126, and the hole of the seal 138 is closed. Have been. The seal 138 is in close contact with the body 114 and the bottom 62, and the hole of the seal 138 communicates with the through hole 136, so that the through hole 136 is closed by the spherical valve 118.

The cleaning liquid supplied to the inside of the movable cylinder 60 passes through the through hole 136 in the bottom 62 and
Of the through hole 136 as described above.
Since the cleaning liquid is closed by the spherical valve 118, the cleaning liquid cannot flow out of the movable cylinder 60. Even in this state, since the cleaning liquid is continuously supplied to the movable cylinder 60, the internal pressure inside the movable cylinder 60 increases,
The fixed piston 84 is about to be pushed out from the open end of the movable cylinder 60, but cannot move basically because the fixed piston 84 is engaged with the circular hole 92 of the frame 18 in the groove 86. Therefore, when the water pressure of the cleaning liquid increases inside the movable cylinder 60, the compression coil spring 7
The movable cylinder 60 moves along its own axial direction toward the direction in which the bottom portion 62 is separated from the fixed piston 84 against the urging force of the movable cylinder 60. Thereby, the movable cylinder 60 protrudes from the frame 18.

At this time, the cleaning liquid is supplied to the movable cylinder 6.
Although the O-ring 82 passes between the inner peripheral portion of the movable cylinder 60 and the outer peripheral portion of the fixed piston 84 and leaks from the open end of the movable cylinder 60, the O-ring 82 Since the space between the fixed piston 84 and the outer periphery is sealed, the cleaning liquid is basically supplied to the movable cylinder 6.
No leakage from the open end of the zero.

Further, when the internal pressure of the movable cylinder 60 rises, the movable cylinder 60 is elastically deformed such that the inner diameter of the movable cylinder 60 is increased at the axially intermediate portion, but the inner diameter of the O-ring 82 is increased. It is provided at the opening end of the movable cylinder 60 that does not have to be expanded or has an extremely small expansion amount. In addition, a flange 74 is formed at the open end of the movable cylinder 60, so that the open end of the movable cylinder 60 is thicker than other parts and has higher rigidity. Thereby, the tension of the O-ring 82 can be prevented from lowering, and the sealing performance can be maintained.

If the movable cylinder 60 continues to protrude outside the frame 18 in the above-mentioned state, the flange 74 of the movable cylinder 60 interferes with the opening end of the cup 76, and the movement of the movable cylinder 60 in the protruding direction is restricted. When the cleaning liquid continues to be further supplied into the movable cylinder 60 from this state, the internal pressure of the movable cylinder 60 exceeds the urging force of the compression coil spring 126, and the cleaning liquid moves the spherical valve 118 against the urging force of the compression coil spring 126. When pressed, the spherical valve 118 is moved in a direction away from the seal 138. As a result, the through-hole 136 is opened, and the cleaning liquid flows through the through-hole 136 into the inside of the valve accommodating portion 116, and further passes through the cleaning liquid flow path 128 from the injection port 112 of the nozzle 110 toward the headlamp. It is injected.

Here, when the movable cylinder 60 slides or other external force acts, depending on the water pressure of the cleaning liquid and the acting direction of the external force, the movable cylinder
0 may try to rotate around its own axis, and when the movable cylinder 60 rotates, the jetting direction of the cleaning liquid changes, and it becomes impossible to spray the cleaning liquid to the headlamp. However, in the present embodiment, when the movable cylinder 60 tries to rotate,
Grooves 7 are formed in ribs 70 formed on the outer peripheral portion of movable cylinder 60.
2 interfere with each other, and the displacement of the rib 70 along the direction around the axis of the movable cylinder 60, that is, the rotation of the movable cylinder 60 is restricted. Therefore, in the present embodiment, the cleaning liquid can be reliably sprayed onto the headlamp.

On the other hand, in the present embodiment, since the spherical valve 118 is limited in displacement in the direction orthogonal to the axial direction of the valve housing 116 by the plurality of projections 120, the spherical valve 118 is driven by the water pressure of the cleaning liquid. The moving direction of 118 is the valve housing 11
6, that is, the axial directions of the through hole 136 and the hole of the seal 138. For this reason, when the water pressure of the cleaning liquid becomes lower than the urging force of the compression coil spring 126 due to a stop of the motor pump or the like, the spherical valve 118 is opened by the urging force of the compression coil spring 126 along the axial direction of the through hole 136. To close the hole in seal 138. As described above, the spherical valve 118 is pressed against the seal 138 in a state where the axis of the hole of the seal 138 and the axis of the through hole 136 substantially coincide with the center of the spherical valve 118.
No gap is formed between the hole 38 and the spherical valve 118, and the hole of the seal 138 and the through hole 136 can be reliably closed by the spherical valve 118.

Further, although the displacement of the spherical valve 118 is restricted by each convex portion 120 as described above, there is a gap between the convex portions 120 along the inner circumferential direction of the valve accommodating portion 116, that is, the cleaning liquid. Since the flow channel 122 is formed, the cleaning liquid can flow smoothly.

Further, one end side of the compression coil spring 126 is held by a valve holding portion
Since the displacement along the inner diameter direction is limited, the biasing direction does not basically change. Therefore, the compression coil spring 126 always causes the spherical valve 118 to pass through the through hole 136.
And the hole of the seal 138 can be coaxially (centered) urged, and this also ensures that the spherical valve 118 seals 138.
And the through hole 136 can be closed.

(Other Functions and Effects) Next, functions and effects of the present embodiment other than the assembling and operating surfaces will be described. As described above, the main movable nozzle 12 is attached to the vehicle body. In addition, the nozzle 110 must be exposed to the outside in the function of spraying the cleaning liquid to the headlamp, and the inside of the frame 18 naturally communicates with the outside of the vehicle. Therefore, rainwater or the like may enter the inside of the frame 18 through the circular hole 68. When such rainwater or the like enters the inside of the frame 18 and the rainwater or the like that has entered in the winter or the like is cooled and becomes ice, the movable cylinder 60
Is mechanically connected to the inner peripheral portion of the frame 18 so that the movable cylinder 60 cannot be slid smoothly.

However, in the present embodiment, since the drain holes 46 and 48 are formed in the frame part 16, rainwater or the like that has entered through the circular hole 68 is drained to the outside of the frame 18 through the drain hole 46. The rainwater or the like that reaches the vertical wall 26 through the side of the drain hole 46 is drained to the outside of the frame 18 through the drain hole 48. Therefore, in the present movable nozzle 12, rainwater or the like is not stored inside the frame 18, and the movable cylinder 60 can be slid smoothly even in winter or the like.

<Modification of this Embodiment> (Modification of Convex Portion 120) In this embodiment, as shown in FIG. 6, four 90 ° rotations around the axis of the valve housing portion 116 are provided. Although the configuration is such that the protrusions 120 are formed, for example, as illustrated in FIG. 7, a configuration in which three protrusions 120 are formed every 120 degrees around the axis of the valve housing 116 may be used. That is, if the convex portion 120 simply contacts the spherical valve 118 to limit the displacement of the spherical valve 118, three convex portions 120 are formed every 120 degrees, and the three convex portions 120 are formed.
If the spherical valve 118 is configured to be supported at three points by the two convex portions 120, the displacement of the spherical valve 118 can be surely limited.

Also, as shown in FIG.
Alternatively, a configuration in which the convex portion 162 is provided on the inner peripheral portion of the valve housing portion 116 may be employed. Unlike the protruding portion 120, only two protruding portions 162 are formed at every 180 degrees.
64 is formed, and a part of the spherical valve 118 enters the inside of the concave portion 164. Therefore, at both ends in the circumferential direction of the concave portion 164, the distance between the one convex portion 162 and the other convex portion 162 becomes smaller than the outer diameter of the spherical valve 118, and the holding of the spherical valve 118 by the pair of convex portions 162 is released. It will not be done. Therefore, in this configuration, although only two convex portions 162 are formed, the displacement of the spherical valve 118 can be surely limited.

(Modified Example Regarding Connecting Portion 98) In the present embodiment, the connecting portion 98 is formed in a cylindrical shape coaxial with the fixed piston 84. For example, FIGS. As shown in FIG. 7, the axial direction of the connecting portion 98 may be inclined with respect to the axial direction of the fixed piston 84.

In such a configuration, the axial direction at the portion where the tubular member is inserted into the connecting portion 98 is inclined with respect to the axial direction of the fixed piston 84. That is, the annular member is not always arranged coaxially with the axial direction of the fixed piston 84 depending on the arrangement position.
Therefore, in the configuration in which the connecting portion 98 is formed in a cylindrical shape coaxial with the fixed piston 84, the axial direction of the tubular member must be forced to be coaxial with the fixed piston 84, and the assembling becomes complicated. It is conceivable that the tubular member may be bent after assembly.

On the other hand, in the configuration in which the axial direction of the connecting portion 98 is inclined with respect to the axial direction of the fixed piston 84 as described above, the tubular member can be naturally assembled to the connecting portion 98, and Bending can be prevented or extremely reduced.

Moreover, when the fixed piston 84 is appropriately rotated around its axis when the tubular member is connected to the connecting portion 98, the direction of the connecting portion 98 can be changed. Thereby, when connecting the tubular member to the connecting portion 98, the connecting portion 98 is oriented in the direction in which the tubular member is most easily connected and the bending of the tubular member is the least after the connecting, so that the assembling property is further improved, and the tubular member is further improved. Bends are further reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a movable nozzle to which a check valve according to an embodiment of the present invention is applied.

FIG. 2 is a side sectional view of a movable nozzle to which the check valve according to one embodiment of the present invention is applied.

FIG. 3 is a front sectional view of a movable nozzle to which the check valve according to the embodiment of the present invention is applied.

FIG. 4 is a front sectional view corresponding to FIG. 3 and showing a modification of the movable nozzle to which the check valve according to the embodiment of the present invention is applied.

FIG. 5 is an enlarged side sectional view showing a main part of the check valve according to one embodiment of the present invention.

6 is a sectional view taken along line 6-6 in FIG.

FIG. 7 is a sectional view taken along FIG. 6 showing a modification of the check valve according to one embodiment of the present invention.

FIG. 8 is a sectional view along FIG. 6 showing another modified example of the check valve according to one embodiment of the present invention.

FIG. 9 is a side sectional view showing a modification of the movable nozzle.

FIG. 10 is a side sectional view corresponding to FIG. 9, showing another modified example of the movable nozzle.

FIG. 11 is a side sectional view corresponding to FIG. 9 showing a configuration of a conventional injection nozzle.

FIG. 12 is a cross-sectional view showing a main part of a configuration of a conventional injection nozzle.

[Explanation of symbols]

 10 Check valve 114 Body (first housing, housing) 118 Spherical valve (valve element) 120 Convex part (holding means) 126 Compression coil spring (biasing means) 134 Cylindrical body (second housing, housing) 136 Through hole (communication) (Hole) 138 seal (inclusion, valve seat, sealing means) 144 claw (engaging piece, connecting means) 148 engaging ring (engaging wall, connecting means) 162 convex part (holding means)

Claims (8)

[Claims] A cylindrical housing provided in a fluid flow path and communicating between the inside and the outside, wherein the fluid having entered from the outside through the communication hole passes through the inside; A valve body that is housed in the housing so as to be able to move toward and away along the direction of the flow of the fluid, and closes the communication hole to block the fluid in a state of being closest to the communication hole; A biasing means provided in the housing and for biasing the valve body toward the communication hole; and a biasing means provided in the housing and movable in a state where the valve body is separated from the housing inner peripheral portion; Holding means capable of holding the valve body in a state where the valve body is opposed to the communication hole so as to close the communication hole. 2. An outer diameter dimension of the valve body is formed in a substantially spherical shape larger than an opening diameter of the communication hole or a hole formed in an intervening body between the communication hole and the valve body. The holding means holds the valve body in a state where the opening axis of the communication hole and the hole of the inclusion located on the valve body side and the center of the valve body substantially coincide with each other. Item 7. The check valve according to Item 1. 3. A plurality of housings are formed at predetermined intervals along the inner circumferential direction of the housing, and project from the inner circumferential portion of the housing toward the center in the inner diameter direction of the housing and are integrally formed with the housing. The check valve according to claim 1 or 2, wherein a convex portion of the check valve is used as the holding means. 4. A cylindrical housing provided in a fluid flow path and communicating between the inside and the outside, wherein the fluid that has entered from the outside through the communication hole passes through the inside thereof, and A valve body that is housed in the housing so as to be able to move toward and away along the direction of the flow of the fluid, and closes the communication hole by closing the communication hole closest to the communication hole to block the fluid; An urging means provided inside the housing and for urging the valve body toward the communication hole; and a urging means provided inside the housing of the communication hole and receiving the urging force of the urging means. A check valve, comprising: a valve seat that is elastically deformed by a pressing force. 5. A cylindrical first housing that houses the valve body and the urging means therein, and is formed in a bottomed cylindrical shape that opens toward the downstream side of the fluid, and communicates with the bottom. The check valve according to any one of claims 1 to 4, wherein the housing comprises: a second housing having a hole formed therein and accommodating the first housing therein. 6. A connecting means for integrally connecting the first housing to the second housing while the first housing is housed in the second housing, wherein at least one of the first housing and the second housing. The check valve according to claim 5, wherein the check valve is provided on one side. 7. An engaging piece provided on one of the first housing and the second housing, and an engaging piece provided on one of the other of the first housing and the second housing. In a state in which the first housing is housed, the first housing is opposed to the engagement piece along the housing direction and the opposite direction, and interferes with the engagement piece when the second housing is displaced in a direction opposite to the housing direction. 7. The check valve according to claim 6, wherein the connecting means includes: a joint wall. 8. A device provided on at least one of an outer peripheral portion of the first housing and an inner peripheral portion of the second housing, wherein the first housing is housed in the second housing to the other one. The check valve according to any one of claims 5 to 7, further comprising a seal unit that closely contacts the one of the check valves.