JP3486066B2 - Flow control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate control valve, and more particularly to a valve opening provided in a flow passage through which a fluid passes, and a valve opening corresponding to the valve opening in the axial direction of the valve opening. And a valve body that is movably held.

[0002]

2. Description of the Related Art FIG. 9 is an explanatory view of a conventional flow control valve (9). The flow control valve (9) shown in the figure includes a valve opening (9a) formed in a flow path (90) through which water passes, and a valve body (9b) corresponding to the valve opening (9a). This is the configuration. The flow control valve (9) is provided with a drive device (not shown) that holds the valve body (9b) and moves it in the axial direction of the valve opening (9a).

The valve body (9b) has a first valve portion (91) which is inserted into the valve opening (9a) by moving toward the valve opening (9a) side, and a first valve portion (91).
A second valve part that is integrated on the opposite side of the valve port (9a) with the (91) interposed.
It consists of (92) and. The valve port (9a) has a uniform circular cross section in the axial direction. Further, the first valve portion (91) is formed in a truncated cone shape that is tapered toward the inner side of the valve opening (9a), and the second valve portion (92) is the first valve portion.
It is formed in a disk shape having a larger diameter than (91).

In this structure, when the first valve portion (91) is not inserted into the valve opening (9a), the valve body (9b) moves in the axial direction so that the first valve portion (91) becomes The gap (A) in the approximately axial direction between the valve opening (9a) and the peripheral portion changes. This change controls the flow rate of water at a large flow rate. The gap (A) is the opening of the valve body (9b) at the time of the large flow rate. or,
When the opening is reduced from the time of the large flow rate, the first valve (9
1) is inserted into the valve port (9a). The movement of the first valve portion (91) during the insertion causes the first valve portion (91) and the valve opening (9
The gap (B) in the approximately radial direction with the peripheral surface of a) changes. This change controls the flow rate of water at a small flow rate.
The gap (B) is the opening of the valve body (9b) at the small flow rate. Further, since the first valve portion (91) is formed in the shape of a truncated cone that is tapered toward the inner side of the valve opening (9a), the flow rate gradually decreases with the movement.

Further, when the movement proceeds, the second valve portion (92) finally comes into contact with the peripheral portion of the valve opening (9a) over the entire circumference.

[0006]

However, in this conventional technique, since the peripheral portion of the valve opening (9a) and the valve body (9b) are made of metal, the valve opening (9a) in the abutting state is Is not completely stopped. On the other hand, it is conceivable to improve the dimensional accuracy of the surfaces of the valve body (9b) and the peripheral edge portion that face each other so that the metal touch is such that the water can be stopped. However, it is not easy to secure the dimensional accuracy to the extent that the water can be stopped.

It is an object of the present invention to provide a flow rate control valve having improved water shutoff performance without strict dimensional accuracy.

[0008]

According to a first aspect of the present invention, there is provided a valve opening provided in a flow path through which a fluid passes,
A valve body that corresponds to the valve opening and is movably held in the flow path in the axial direction of the valve opening, and is inserted into the valve opening by moving the valve body toward the valve opening side. A first valve portion provided in the valve body and having a gap between the valve body and a circumferential surface of the valve mouth that changes with movement when the valve body is inserted; and an opposite side of the valve mouth with the first valve portion interposed therebetween. A second valve portion which is provided on the valve body so as to be positioned on the side, and which abuts the peripheral portion of the valve opening over the entire circumference in a state where the first valve portion is inserted; Watertight means provided with two valve portions and made of an elastic body that is in contact with the peripheral edge of the valve opening in a watertight state over the entire peripheral edge, and a watertight means. The body is formed on the entire outer peripheral portion of the second valve portion,
The outer peripheral surface of the elastic body has a diameter smaller than the diameter of the peripheral surface of the valve opening and is inserted into the valve opening.
And a second peripheral surface which extends from the edge continuing from the peripheral surface to the outer peripheral side and abuts on an annular end surface that is perpendicular to the axis of the valve opening. "

At the time of a large flow rate, along with the axial movement of the valve body in a state where the first valve portion is not inserted into the valve opening, a gap between the first valve portion and the peripheral portion of the valve opening is generated. The gap in the substantially axial direction changes. This change controls the flow rate of the fluid. Further, when the flow rate is small, the gap in the substantially radial direction between the first valve portion and the peripheral surface of the valve opening changes in accordance with the movement during the insertion. This change controls the flow rate of the fluid. The gap in the substantially radial direction may increase or decrease with the movement. Further, the change degree of the gap due to the movement may be uniform or not uniform. Moreover,
The watertight means is made of an elastic body, and the elastic body is formed over the entire outer peripheral portion of the second valve portion, and the outer peripheral surface of the elastic body is formed to have a diameter smaller than the diameter of the peripheral surface of the valve opening. And a second peripheral surface that is inserted into the valve opening and extends from the end edge following the first peripheral surface to the outer peripheral side and contacts the annular end surface that is perpendicular to the axis of the valve opening. And consists of the second
In the state where the gap between the valve portion and the peripheral portion is small, the second
Even if the valve portion vibrates due to the flow of fluid and the second valve portion comes into contact with the peripheral portion, the impact is absorbed by the watertight means.

When the movement further proceeds, the second valve portion finally comes into contact with the peripheral portion of the valve opening over the entire circumference. In this abutting state, the watertight means formed of an elastic body provided on at least one of the second valve portion and the peripheral edge portion is in a watertight state over the entire circumference with respect to the other. Here, as in the invention of claim 2, it may be one that "further comprises an urging means for urging the valve body toward the valve opening side in the abutting state".

In this structure, the valve means is urged toward the valve opening side in the abutting state by the urging means, so that the abutting state is further stabilized. Claim 3
According to another aspect of the present invention, "the valve opening is formed in a circular cross section having a uniform diameter in the axial direction, and the first valve portion is a truncated cone that is tapered toward the inner side of the valve opening. The second valve portion is formed in a disk shape having a diameter larger than that of the valve opening. ”
It may be one.

[0012] In this structure, the gap in the substantially radial direction between the peripheral surface of the valve opening and the first valve portion becomes smaller with the inward movement at the time of the small flow rate. Further, the degree of change in the gap due to the movement becomes substantially uniform. In addition to the invention of claim 3, the valve opening and the valve portion may be formed in a rectangular cross section, or the cross sectional shape of the valve opening may change in the axial direction.

According to a fourth aspect of the invention, in the "the watertight means includes an annular rubber portion formed on a surface of the second valve portion facing the peripheral edge portion", the rubber portion This ensures the contact in the watertight state described above.

[0014]

As described above, in the invention of claim 1, when the second valve portion is in contact with the peripheral portion of the valve opening, at least one of the second valve portion and the peripheral portion is provided. Since the watertight means provided is in contact with the other in a watertight state over the entire circumference, the valve opening is completely stopped. Therefore, the waterproof performance is improved as compared with the conventional one.

Further, since the watertight means is made of an elastic body,
The dimensional accuracy of the second valve portion and the peripheral portion does not need to be strict compared with the case where the water is completely stopped by the metal touch between the second valve portion and the peripheral portion. Further, since the watertight means is made of an elastic body, elastic deformation of the watertight means when the second valve portion comes into contact with the peripheral edge portion and when the second valve portion separates from the peripheral edge portion. Thereby, the degree of close contact between the second valve portion and the peripheral portion gradually changes. Therefore, the change in the flow rate at the time of the contact and the separation is slower than that of the metal touch that completely stops the water (the elastic deformation does not occur). Therefore, the flow rate control becomes easy.

Further, since the watertight means is made of an elastic body,
Even if the second valve portion vibrates due to the flow of fluid and the second valve portion comes into contact with the peripheral edge portion in a state where the gap between the second valve portion and the peripheral edge portion is small, the impact is still generated. It is absorbed by the watertight means. Therefore, compared to the metal touch type, it is possible to suppress the generation of abnormal noise when the vibration is generated.

According to the invention of claim 2, the contacting state between the second valve portion and the peripheral portion is further stabilized by the biasing means, so that the water stopping performance is further improved. According to the invention of claim 3, the gap in the substantially radial direction between the first valve portion and the peripheral surface of the valve opening changes substantially uniformly with the movement of the first valve portion at the time of the small flow rate. Will be easier.

In the invention of claim 4, since the watertight state is constituted by the rubber portion formed on the second valve portion, the watertight means can be easily manufactured. Further, when the second valve portion and the peripheral portion are made of metal as in the conventional case, both are fixed or bitten by sticking of water stains or direct contact between metals and corrosion. Although it tends to be in a state, in the invention of claim 4, since the both are in contact with each other through the rubber portion, the fixation is prevented. Therefore, when separating the second valve portion from the peripheral edge portion, it is not necessary to apply a large force to the second valve portion to release the fixation, and the second valve portion is separated from the peripheral edge portion. A sudden change in the flow rate due to a sudden separation can be suppressed. Also in this respect, the flow rate control becomes easier.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
It will be described with reference to the drawings. FIG. 1 is a sectional view of a water flow control valve (100) according to an embodiment of the present invention, and FIG.
It is a partially expanded view of the water quantity control valve (100) of FIG. Also, FIG.
2 is a sectional view of the first cylindrical body (3a) of the valve body (3) of FIG. 2, and FIG. 4 is a sectional view of a second cylindrical body (3b) of the valve body (3) of FIG.

As shown in the figure, the water quantity control valve (100) is
The casing (2) and the flow path (200) inside this casing (2)
The valve body (3) corresponding to the valve opening (20) formed in the
A drive device (4) capable of driving (3) in the axial direction of the valve port (20),
It is a configuration including. [Regarding the configuration of each part] * Casing (2) * The above casing (2), as shown in FIG. 1 and FIG.
A main cylinder part (22) made of metal and arranged in a substantially horizontal posture and having a substantially circular cross section, and a main cylinder part (22) connected to the lower side of one end of the main cylinder part (22) in a substantially vertical posture. An inflow tube portion (21) having a substantially circular cross section that allows water to flow into the (22) and an outflow tube portion (23) that is axially connected to the one end portion and that allows water to flow out from the main tube portion (22). ), And the structure which comprises.

The outflow tube portion (23) has a smaller diameter than the main tube portion (22), and the inside of the boundary portion between the main tube portion (22) and the outflow tube portion (23) has the above-mentioned structure. A valve port (20) is formed. The valve port (20) is set to have a circular cross section with a uniform diameter in the axial direction. An annular end surface (25) perpendicular to the axis of the valve opening (20) is continuous with the end of the peripheral surface (24) of the valve opening (20) on the side of the main cylinder (22). ing.

Further, the water quantity control valve (100) is provided with an insertion member (6) inserted into the inside of the main tubular portion (22). This insertion member (6) is the valve opening in the main cylinder (22).
A base portion (6a) fitted and held in a watertight state with respect to the end portion on the opposite side to (20), and a valve body (to be described later) integrated with the valve opening (20) side of the base portion (6a). And a cylindrical holding portion (6b) for holding 3) so as to be movable in the axial direction. The holding portion (6b) is arranged so that its axis coincides with the axis of the valve port (20).

A valve shaft (4c), which will be described later, is fitted into the insertion member (6) so as to penetrate through the central portions of the cross sections of the base portion (6a) and the holding portion (6b) in the axial direction. ing. * Valve body (3) * The valve body (3) above has a valve opening (2) as shown in Figs.
The first cylinder (3a) located on the (0) side and the second cylinder (3b) located on the insertion member (6) side are configured in combination.

The first cylindrical body (3a) is made of metal, and the first cylindrical body (3a) has a valve opening as shown in FIGS.
Large-diameter hole formed inside a certain range from the (20) side edge
(31a), an annular portion (31) that extends over the entire circumference from the middle of the axial direction on the outer peripheral surface, and an extension tubular portion (32) that extends from the inner peripheral portion toward the insertion member (6). ), And are provided. The annular portion (31) is formed in a tapered truncated cone shape toward the valve opening (20) side, and its outer peripheral surface is a tapered surface (311) whose diameter is reduced toward the valve opening (20) side. Has become. This taper surface
(311) is set such that its bus bar is inclined by about 5 ° to 7 ° with respect to the bus bar of the peripheral surface (24) of the valve opening (20).

The annular portion (31) in the first cylinder (3a)
The outer peripheral surface of the tip (312) closer to the valve opening (20) than the valve opening is
It is formed to have a tapered shape in which the diameter is reduced toward the (20) side. The second cylindrical body (3b) has the structure shown in FIGS.
As shown in Fig. 7, a body part formed inside a certain range from the edge on the valve opening (20) side and closer to the insertion member (6) than the annular part (31) in the first tubular body (3a). (38) is just inserted into the recess (3
4), and an annular step portion (35) formed so as to expand in diameter toward the insertion member (6) side on the inner peripheral surface on the insertion member (6) side of the recessed portion (34), An annular protrusion (33) formed so as to extend over the entire circumference at an outer peripheral surface within a certain range from the edge on the valve opening (20) side, and an outer peripheral surface on the end on the insertion member (6) side. And an annular groove (36) into which the O-ring (81) is fitted and which is formed so as to be recessed over the entire circumference thereof.

The peripheral surface between the concave portion (34) and the stepped portion (35) has the extension cylinder portion with the body portion (38) fitted in the concave portion (34). (32) is formed to have a diameter that allows it to be just fitted. Further, the stepped portion (35) is arranged so that the tip end portion of the extension cylinder portion (32) and the axial position of the stepped portion (35) coincide with each other in the fitted state. When manufacturing the valve body (3), the tip end portion of the extension tubular portion (32) is plastically deformed so as to expand to the outer peripheral side in the fitted state. Due to this deformation, the deformed portion of the extension tubular portion (32) engages with the step portion (35) in the axial direction, so that the first tubular body (3a) and the second tubular body (3)
b) and are integrated.

An annular rubber portion (30) is formed on the entire outer peripheral portion of the annular protruding portion (33). This rubber part (3
0) is integrated with the main body on the inner peripheral side by baking. The main body is made of metal. And
The outer peripheral surface of the rubber portion (30) is a first peripheral surface (314) having a uniform diameter in a certain range from the edge on the valve opening (20) side, and the first peripheral surface (314). A second peripheral surface (313) which projects from the edge on the insertion member (6) side to the outer peripheral side and slightly inclines toward the outer peripheral side toward the insertion member (6) side. The first peripheral surface (31
The diameter of 4) is the insertion member in the above tapered surface (311).
The diameter of the edge on the (6) side is the same, and the valve opening (2
The diameter is slightly smaller than the diameter of the peripheral surface (24) of (0).
Therefore, due to the axial movement of the valve body (3), the tapered surface (311)
The (annular portion (31)) and the first peripheral surface (314) are to be inserted into the valve port (20).

The O-ring (81) is inserted in the holding portion (6b) at a portion closer to the insertion member (6) than the annular protrusion (33) in the second tubular body (3b). The holding portion (6b) is formed in such a size that it is in close contact with the inner peripheral surface over the entire circumference. As a result, the watertight state is maintained between the valve body (3) and the holding portion (6b), and rattling in the radial direction of the valve body (3) is prevented.

* Driving device (4) * As shown in FIGS. 1 and 2, the driving device (4) has an end of the main tubular portion (22) opposite to the outlet tubular portion (23). The motor (40) screwed to the part, and the cylindrical body integrated with the output shaft (not shown) of the motor (40) and formed with the female screw.
(4a) and one side of this cylindrical body (4a) are screwed together, and the other side is relatively movable only in the axial direction with respect to the central hole (61) of the base (6a) of the insertion member (6). Slide member (4
b) and a valve shaft (4c) which is held in a state of penetrating the slide member (4b) and being prevented from relative movement in the axial direction with respect to the slide member (4b). Is.

The valve shaft (4c) is inserted in the valve body (3), and the valve shaft (4c) projects from the portion of the valve shaft (4c) inside the large diameter hole (31a). An annular engaging portion (41) that engages with (3) is formed. By this engaging portion (41),
The valve body (3) does not fall off to the valve opening (20) side.
Further, a spring (4d) is provided which is fitted over the valve shaft (4c) and is located between the base end of the holding portion (6b) and the extension cylinder portion (32) of the valve body (3). There is. The engagement portion (41) and the spring (4d) maintain the valve body (3) in a state in which relative movement in the axial direction with respect to the valve shaft (4c) is blocked.

An O-ring (82) is mounted between the valve shaft (4c) and the base end of the holding portion (6b). The O-ring (82) prevents water leakage from the insertion portion of the valve shaft (4c). Further, in the valve shaft (4c), a hole portion (42) formed between the central portion of the end surface on the valve opening (20) side and the axial recessed portion to the arrangement portion of the spring (4d), A plurality of through holes (43) (43) penetrating from the inner end of the hole (42) to the outer peripheral side of the valve shaft (4c),
Are formed. As a result, the valve body (3) and the holding part (6
Since the space between b) and the flow path (200) are in communication,
The water in the space is not forcibly expanded or compressed when the valve body (3) moves. Therefore, the movement of the valve body (3) is smooth.

In this structure, when the motor (40) operates, the output shaft of the motor (40) rotates and the cylinder (4a) rotates. At this time, since the slide member (4b) screwed into the cylindrical body (4a) can move only in the axial direction relative to the insertion member (6) fixed at a fixed position, the motor (40 ), The slide member (4b) moves in the axial direction. And
Since the axial relative movement of the valve shaft (4c) with respect to the slide member (4b) is blocked and the axial relative movement of the valve body (3) with respect to the valve shaft (4c) is blocked, the motor (40) The actuation causes the valve body (3) to move axially.

The size of each part of the drive device (4) is adjusted so that the annular protrusion (33) contacts the annular end surface (25) by the axial movement of the valve body (3). Etc. are set. The size of the spring (4d) and the like are set so that the annular protruding portion (33) is pressed against the annular end surface (25) in the abutting state. * Other configurations * This water flow control valve (100) has a main cylinder part in addition to the above parts.
A water pressure sensor (5) that is mounted on the wall of (22) and detects the water pressure of the flow path (200), and a water pressure sensor (5) that is mounted on the inflow cylinder part (21) and detects the flow rate of water in the flow path (200). A control circuit that controls the operation of the motor (40) by calculating the drive amount of the valve body (3) based on the water pressure detected by the impeller type flow sensor (7) and the water pressure sensor (5). (Not shown).

[Use of Hot Water Supply Device (1)] FIG.
FIG. 6 is a cross-sectional view showing the relationship between the valve body (3) and the valve opening (20) at a large flow rate, and FIG. 6 is a diagram showing the relationship between the valve body (3) and the valve opening at a small flow rate.
FIG. 7 is a cross-sectional view showing the relationship with (20), and FIG. 7 is a cross-sectional view showing the relationship between the valve body (3) and the valve opening (20) when the water is stopped.
The flow rate control by the water amount control valve (100) will be described with reference to FIG.

At the time of large flow rate, as shown in FIG.
The annular portion (31) of (3) is not inserted into the valve port (20). In this state, when the valve body (3) is moved in the axial direction, the gap (301) in the substantially axial direction between the annular portion (31) and the annular end surface (25) changes with the movement. This change controls the flow rate of water flowing from the main cylinder part (22) into the valve port (20), that is, the flow rate of water passing through the water volume control valve (100).

At a small flow rate, as shown in FIG. 6, the valve body (3) is further moved toward the inner side of the valve opening (20) from the state at the time of the large flow rate, and the ring shape of the valve body (3) is changed. The part (31) is inserted into the valve opening (20). At the time of the insertion, the annular portion is changed from the solid line in the figure to the alternate long and two short dashes line along with the movement.
The gap (302) in the substantially radial direction between the tapered surface (311) of (31) and the peripheral surface (24) of the valve opening (20) changes so as to become smaller. This change controls the flow rate. In this case, since the change due to the movement is substantially uniform, the flow rate control is easy.

At this small flow rate, the first peripheral surface of the rubber part (30)
When (314) is inserted into the valve port (20), the gap between the first peripheral surface (314) and the peripheral surface (24) becomes extremely small, so that the flow rate becomes small. Further, since the diameter of the first peripheral surface (314) is uniform in the axial direction, the flow rate does not change even in the above movement in this state. Further, when the insertion is continued, the second peripheral surface (313) following the first peripheral surface (314) contacts the annular end surface (25). In this contact state, the rubber part
Since the (30) and the annular end surface (25) are in intimate contact with each other over the entire circumference, the valve opening (20) has been stopped.

This product has the following effects. ． Since the rubber portion (30) and the annular end surface (25) are in intimate contact with each other over the entire circumference, the waterproof performance is improved as compared with the conventional one. In addition, compared to the case where the water is completely stopped by the metal touch between the annular protrusion (33) and the annular end surface (25), the annular protrusion (3
The dimensional accuracy of 3) and the annular end surface (25) does not have to be strict.

.. Since the rubber portion (30) is provided, when the annular protrusion (33) contacts the annular end surface (25), the annular protrusion (33) separates from the annular end surface (25). At this time, due to the elastic deformation of the rubber portion (30), the degree of close contact between the annular protruding portion (33) and the annular end surface (25) gradually changes. Therefore, the change in the amount of water at the time of contact and separation is slower than that of the metal touch that completely stops water, that is, the one that does not elastically deform. Therefore, it becomes easy to control the water volume with the water volume control valve (100).

.. When the annular protrusion (33) vibrates due to the flow of fluid in a state where the gap between the annular protrusion (33) and the annular end face (25) is small, the annular protrusion (33) may hit the annular end face (25). However, since the rubber portion (30) is provided, the rubber portion (30) absorbs the impact when the annular protruding portion (33) hits the annular end surface (25). Therefore, as compared with the above-described metal touch type in which metals are directly contacted with each other, generation of abnormal noise when the vibration is generated is suppressed.

.. With the spring (4d) above, the rubber part (30)
Since the rubber part (30) is pressed against the annular end face (25) while the rubber part (30) is in contact with the annular end face (25), the contact state between the rubber part (30) and the annular end face (25) is more stable. is doing. Therefore, the water stop performance is further improved. ． Since the structure for stopping the water is realized by the rubber part (30), the structure is easy.

.. The main portion of the annular protrusion (33) and the annular end surface (2
5) and is made of metal, but the above-mentioned rubber part is attached to the annular protrusion (33).
Since (30) is provided, there is no direct contact between the metals, and it is possible to prevent the disadvantage that the metals are fixed to each other due to corrosion or the like when water stains or the like are attached or at the time of contact. Therefore, when separating the annular protrusion (33) from the annular end surface (25), it is not necessary to apply a large force to the valve body (3) to release the fixation, and the annular protrusion (33) is A sudden change in water volume due to a sudden separation from the annular end surface (25) is suppressed. In this respect as well, this water flow control valve (100)
It is easy to control the amount of water.

In this case, due to the effect of the above, as shown in the graph of FIG. 8, the change in the amount of water at the rising of the valve body (3) from the water stopped state becomes gentle. A two-dot chain line in the figure shows a water amount change in the case of the metal touch type without the rubber part (30), and a solid line in the figure shows a water amount change in the case of having the rubber part (30). In this case, the water amount control valve (100) corresponds to the "flow rate control valve" described in the claims, and the flow path (200) described above is the "flow rate control valve" described in the claims. It is equivalent to "road". or,
The valve opening (20) is the “valve opening” described in the claims.
Equivalent to.

The annular portion (31) corresponds to the "first valve portion" described in the claims, and the annular protruding portion (33) described in the claims. It corresponds to the "second valve portion", the rubber portion (30) corresponds to the "rubber portion" and "watertight means" described in the claims, and the valve element (3) described above. It corresponds to the "valve element" described in the claims. Further, the spring (4d) corresponds to the "biasing means" described in the claims. [Other Embodiments]. In the above embodiment, the annular portion (3
The gap (302) is configured to decrease with the inward movement of the annular portion (31) with the (1) inserted, but the gap (302) is reduced by the movement. May be increased.

In the above embodiment, the degree of change of the gap (302) due to the movement is uniform, but it may be nonuniform. ． In the above embodiment, the valve opening (20) and the annular portion (31) have a circular cross section, but they may have a rectangular cross section. ． In the above embodiment, the above-mentioned “watertight means” is the rubber portion (30) formed on the annular protruding portion (33),
This may be an annular rubber portion formed over the entire circumference of the annular end surface (25). Both rubber parts may be used. Further, as long as the annular protruding portion (33) and the annular end surface (25) are elastic bodies that are in watertight contact, the rubber portion (30) is used.
Other configurations may be adopted.

.. The aforementioned “fluid” is not limited to the above water. For example, liquid such as oil or gas such as gas may be used.

[Brief description of drawings]

FIG. 1 is a view showing a water amount control valve (10 according to an embodiment of the present invention.
Cross section of (0)

FIG. 2 is a partially enlarged view of the water flow control valve (100) of FIG.

FIG. 3 is a cross-sectional view of the first cylindrical body (3a) of the valve body (3) of FIG.

4 is a cross-sectional view of the second cylindrical body (3b) of the valve body (3) of FIG.

FIG. 5 is a cross-sectional view showing the relationship between the valve body (3) and the valve opening (20) at a large flow rate.

FIG. 6 is a sectional view showing the relationship between the valve body (3) and the valve opening (20) at a small flow rate.

FIG. 7 is a sectional view showing the relationship between the valve body (3) and the valve opening (20) when the water is stopped.

FIG. 8 is a graph showing the relationship between the water volume and the rotation angle of the motor (40).

FIG. 9 is an explanatory view of a conventional flow rate control valve (9).

[Explanation of symbols]

(100) ・ ・ ・ Water control valve (200) ・ ・ ・ Flow path (20) ・ ・ ・ Valve (31) ・ ・ ・ Ring (33) ... annular protrusion (30) ・ ・ ・ Rubber part (3) ・ ・ ・ Valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-145867 (JP, A) Actually opened 59-110474 (JP, U) Actually opened 62-37668 (JP, U) Actually opened 4- 111966 (JP, U) S. 50-40325 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 1/34 F16K 1/36 F16K 1/44

Claims (4)

(57) [Claims] 1. A valve opening provided in a flow path through which a fluid passes, a valve body corresponding to the valve opening and held in the flow path so as to be movable in an axial direction of the valve opening, and the valve. The valve body is provided so as to be inserted into the valve opening by moving the body toward the valve opening side, and the gap between the valve body and the peripheral surface of the valve opening changes with the movement when the body is inserted. A first valve portion, and a peripheral portion of the valve opening provided in the valve body so as to be located on the opposite side of the valve opening with the first valve portion sandwiched between the first valve portion and the inserted state. A second valve portion that is in contact with the entire circumference with respect to the entire circumference, and a second valve portion that is provided in the second valve portion and is in contact with the peripheral edge portion of the valve opening over the entire peripheral edge portion. A watertight means made of an elastic body that comes into contact with the watertight state, wherein the elastic body is formed over the entire outer peripheral portion of the second valve portion, and A surface is formed with a diameter smaller than the diameter of the peripheral surface of the valve opening and is inserted into the valve opening, and an axial line of the valve opening protruding from the end edge continuing from the first peripheral surface toward the outer peripheral side. And a second peripheral surface that is in contact with an annular end surface that is perpendicular to the flow rate control valve. 2. The flow control valve according to claim 1, further comprising an urging means for urging the valve body toward the valve opening side in the abutting state. 3. The valve opening is formed in a circular cross section with a uniform diameter in the axial direction, and the first valve portion has a truncated cone shape that tapers toward the inner side of the valve opening. Formed, the second
The flow control valve according to claim 1 or 2, wherein the valve portion is formed in a disc shape having a diameter larger than that of the valve opening. 4. The flow control valve according to claim 3, wherein the watertight means includes an annular rubber portion formed on a surface of the second valve portion facing the peripheral edge portion.