JP4451955B2 - Needle-type instrument plug - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a needle-type instrument plug.
[0002]
[Prior art]
Conventionally, a rotary closing type instrument plug used as an electric instrument plug for a gas stove is roughly composed of a valve body and a closing, and the closing has a groove (gas passage) for adjusting the amount of gas. It is provided on the circumference. Grease is applied to the contact surface between the closure and the valve body in order to prevent gas leakage and improve rotational slidability. Such a rotary closing type instrument plug has an advantage that the structure is simple and can be closed, but on the other hand, the grease enters the closing groove to some extent, and as a result, with respect to the rotation angle of the closing. There is a problem that the amount of gas becomes unstable (varies). There is no particular problem when the user adjusts the heating power to a small fire while manually watching the flame as in the prior art, but there is a possibility of misfire if the user uses an electric motor to make a small fire.
[0003]
As another conventional example of an electric appliance plug for a gas stove, for example, Japanese Patent Application Laid-Open No. 11-108204 discloses a needle type appliance plug A ′ as shown in FIG. A side hole 5 is provided in the side wall of the valve body 1 ′, and a valve seat O-ring 30, which is a separate component from the valve body 1 ′, is attached to a position closer to the gas inlet side than the side hole 5. At the tip of the valve body 10 ′, a tapered portion 14 that is inclined so as to become thinner toward the tip is provided. A digging 33 and a needle hole 32 orthogonal to the digging 33 are provided inside the tapered portion 14, and the needle hole 32 opens into a constricted portion 40 provided at the base of the tapered portion 14. In this needle-type instrument plug A ′, in the medium fire / large fire adjustment range shown in FIG. 6A, the valve body 10 ′ is moved up and down to adjust the clearance between the tapered portion 14 and the valve seat O-ring 30. Thus, it is possible to obtain a large fire gas amount and a medium fire gas amount. Further, in the small fire adjustment position shown in FIG. 6B, the gas can be supplied only from the needle hole 32 by pushing down the valve body 10 ′ and bringing the tapered portion 14 into contact with the valve seat O-ring 30. Small fire gas amount can be obtained. Further, by pushing down the valve body 10 'and fitting the tapered portion 14 into the valve seat O-ring 30, the gas closed state shown in FIG. 6C is obtained, and the gas passage can be closed.
[0004]
In the needle-type instrument plug A ′, the gas amount is almost stably determined by the lift amount of the valve body 10 ′, and the small fire gas amount can be obtained relatively stably by the needle hole 32. There is an advantage.
[0005]
[Problems to be solved by the invention]
However, in the needle-type instrument plug A ′ disclosed in JP-A-11-108204, a separate valve seat O-ring 30 is attached to the inner surface of the valve body 1 ′, and when the gas is closed, the valve seat O-ring 30 is attached. Since the tapered portion 14 provided at the tip of the valve body 10 ′ is pressed against the valve seat O ′, the valve seat O-ring 30 is easily deformed. For this reason, the gap between the tapered portion 14 and the valve seat O-ring The accuracy of the adjustment becomes worse, especially the adjustment of the medium-fired thermal power and gas shut-off will not be successful. That is, when the gas closed state shown in FIG. 6C is set, the valve seat O-ring 30 is expanded by the tip of the valve body 10 ', so that the valve seat O-ring 30 is easily plastically deformed. In addition, the adjustment of the clearance between the valve seat O-ring 30 deformed when the valve body 10 'is lifted up becomes unstable, and particularly the adjustment accuracy of the medium-fired thermal power deteriorates and the adjustment accuracy of the small-fired thermal power also deteriorates. In addition, the gas closing may be incomplete, and the O-ring 30 for the valve seat is a separate part, so the number of parts of the valve body 1 'increases, resulting in a complicated structure and an increased cost. There is also a problem of inviting. In addition, when the valve body 10 ′ is electrically driven, there is a problem that it is necessary to increase the output of the motor because a force is applied to the motor to push the valve seat O-ring 30 when the gas is closed.
[0006]
The present invention was invented in view of the problems of the above-described conventional example, and the object of the present invention is to supply a stable gas amount to the burner with respect to the lift amount of the valve body, and in particular, A medium fire power can be obtained stably, and a small amount of fire gas can be obtained stably. Further, there is no need to use a conventional valve seat O-ring as a separate part, and the drive unit It is an object of the present invention to provide a needle-type instrument plug that can reliably close a gas without increasing the output.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, the inner surface 1a of the valve body 1 has a first seal surface 2 having the largest inner diameter, a second seal surface 3 having a smaller inner diameter than the first seal surface 2, A third seal surface 4 having an inner diameter smaller than that of the second seal surface 3 is formed in this order from one end 1b side of the valve body 1 to the other end 1c side, and a lateral hole 5 is provided in the first seal surface 2. A gas passage 6 is formed between the lateral hole 5 and the other end 1c of the valve body 1, and the outer surface of the valve body 10 slidably accommodated in the valve body 1 is located at a position where the lateral hole 5 is not blocked. A first closing portion 11 slidably in contact with the first seal surface 2, a second closing portion 12 in contact with the second seal surface 3, and a third contact in contact with and away from the third seal surface 4. And a tapered portion 14 that is tapered toward the distal end of the third closing portion 13 and having one end at the end. A small fire gas passage 15 having an opening at the tip of the first portion 14 and the other end being opened at the outer surface of the third closing portion 13, and driving the valve body 10 within a certain range by the driving portion 20, Medium / large fire adjustment range P1 for adjusting the amount of gas by changing the gap between the second closing portion 12 and the second seal surface 3 and the gap between the third closing portion 13 and the third seal surface 4, and the second closing The portion 12 is separated from the second sealing surface 3 and the third closing portion 13 is brought into contact with the third sealing surface 4 so that the small fire gas passage 15 is formed into a horizontal hole from the gap between the second closing portion 12 and the second sealing surface 3. A small fire adjustment position P2 that communicates with the second seal surface 5 and a close position P3 that closes the gas passage 6 by bringing the second closing portion 12 into contact with the second seal surface 3 and bringing the third closing portion 13 into contact with the third seal surface 4. This configuration makes it possible to switch to the third closed position. The medium heating power can be adjusted easily and accurately simply by changing the gap between the portion 13 and the third seal surface 4, and the third closing portion 13 and the third seal surface 4 are brought into contact with each other for a small amount. By simply opening the fire gas passage 15, it is possible to easily and accurately adjust the small thermal power, and the gas is reliably closed by bringing the second closing portion 12 into close contact with the second seal surface 3. .
[0008]
Further, it is preferable that O-rings 16, 17, 18 for gas sealing are respectively attached to the outer peripheral surfaces of the first closing portion 11, the second closing portion 12, and the third closing portion 13 of the valve body 10. Gas seal between the first closing portion 11 and the first seal surface 2 during medium / large fire adjustment, gas seal between the third closing portion 13 and the third seal surface 4 during small fire adjustment, and gas The gas seal between the second closing portion 12 and the second seal surface 3 at the time of closing can be reliably performed by the O-rings 16, 17 and 18.
[0009]
The drive unit 20 includes a motor 21 with a worm gear 22, and a spiral gear 23 for meshing the valve body 10 with the worm gear 22 to convert the rotational motion of the worm gear 22 into linear motion, and the valve body 1. It is preferable to provide an anti-rotation means for preventing the valve body 10 from rotating about its axis. In this case, the valve body 10 is prevented from rotating so that the linear movement amount of the valve body 10 can be finely adjusted by controlling the rotation of the worm gear 22. Is possible.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0011]
As shown in FIG. 1, the needle-type instrument plug A includes a valve body 1 formed in a substantially cylindrical shape in which inner diameters B1, B2, and B3 (B1>B2> B3) change in three stages, and the inside of the valve body 1 The valve body 10 is slidably housed in the housing, and a drive unit 20 that drives the valve body 10 is provided.
[0012]
On the inner surface 1 a facing the gas passage 6 of the valve body 1, a first seal surface 2 having the largest inner diameter B 1, a second seal surface 3 having an inner diameter B 2 smaller than the first seal surface 2, and a second seal surface 3 A third seal surface 4 having a smaller inner diameter B3 is formed in this order from the one end 1b side of the valve body 1 toward the other end 1c side.
[0013]
The first seal surface 2 is provided with a horizontal hole 5 for gas entry and exit. In this example, the horizontal hole 5 is a gas outlet connected to the burner, and the other end 1c side of the valve body 1 is a gas inlet. On the contrary, the horizontal hole is a gas inlet and the valve body 1 The other end 1c side may be a gas outlet.
[0014]
The outer diameter of the valve body 10 is changed in three stages. The valve body 10 is in contact with the second sealing surface 3 and the first closing portion 11 slidably contacting the first sealing surface 2 at a position where the lateral hole 5 of the valve body 1 is not blocked. The 2nd closing part 12 which contacts detachably and the 3rd closing part 13 which contacts the 3rd seal surface 4 detachably are formed. The outer diameters of the first closing portion 11, the second closing portion 12 and the third closing portion 13 are the inner diameters B1 of the first seal surface 2, the second seal surface 3 and the third seal surface 4 of the valve body 1. Each is set slightly smaller than B2 and B3. Gas seal O-rings 16, 17, and 18 are mounted on the outer peripheral surfaces of the first closing portion 11, the second closing portion 12, and the third closing portion 13, respectively.
[0015]
Further, a tapered portion 14 that is thinner toward the distal end is formed at the distal end of the third closing portion 13 of the valve body 10. A small fire gas passage 15 is formed in the third closing portion 13. The small-fire gas passage 15 is formed by a dug 15a dug inward from the tip of the tapered portion 14, a small-fire orifice 15b provided in the back thereof, and a needle hole 15c orthogonal thereto. Yes.
[0016]
The valve body 10 is driven by a drive unit 20 disposed on the one end 1 b side of the valve body 1. Here, the drive unit 20 includes a motor 21 with a worm gear 22, and this worm gear 22 meshes with a spiral gear 23 provided at the rear end of the valve body 10, and the rotational movement of the worm gear 22 is transmitted via the spiral gear 23. The valve body 10 can be converted into a linear motion. The valve body 10 can move linearly within a certain range by the rotation of the worm gear 22 by the motor 21, and as shown in FIGS. 3 (a) and 3 (b), the second closing portion 12 and the second closing portion 12 can be moved. A medium-fire / large-fire adjustment range P1 in which the amount of gas is adjusted by changing the gap between the seal surface 3 and the gap between the third closing portion 13 and the third sealing surface 4, and the second closing portion as shown in FIG. 12 is separated from the second seal surface 3, and the third closing portion 13 is brought into contact with the third seal surface 4, so that the small fire gas passage 15 passes through the gap between the second closing portion 12 and the second seal surface 3. As shown in FIG. 1, the small fire adjustment position P <b> 2 communicated with the second sealing portion 12 is brought into contact with the second seal surface 3, and the third closing portion 13 is brought into contact with the third seal surface 4, so that the gas passage 6. Can be switched to a closing position P3 for closing the.
[0017]
Further, a detent means for preventing the valve body 1 from rotating around the axis of the valve body 10 is provided. As shown in FIG. 1 and FIG. 2, as a detent means, a slit hole 25 formed on the side wall on the one end 1 b side of the valve body 1 along the axial direction (vertical direction in FIG. 2), The guide pin 24 is press-fitted into the valve body 10, and the guide pin 24 and the slit hole 25 prevent the valve body 10 from rotating about the axis of the valve body 1. The slit hole 25 is always blocked from the gas passage 6 by the first closing portion 11 of the valve body 10.
[0018]
Next, an example of the operation will be described. When the motor 21 is driven, the second closing portion 12 of the valve body 10 is separated from the second seal surface 3 and the third closing portion 13 is separated from the third seal surface 4, and the valve body 10 As shown in FIG. 5A or FIG. 5B, the gas supplied from the other end 1c of the valve body 1 causes the gap between the third closing portion 13 and the third seal surface 4 to move. And the small fire gas passage 15 passes through the gap between the second closing portion 12 and the second seal surface 3 and is supplied to the burner via the lateral hole 5. At this time, gas sealing is performed by the gas sealing O-ring 16 attached to the first closing portion 11 of the valve body 10. At this time, the amount of gas from the lateral hole 5 is controlled by the size of the gap between the third closing portion 13 and the third seal surface 4. Since the gap between the third closing portion 13 and the third seal surface 4 is determined by the linear movement of the valve body 10, the amount of gas supplied from the lateral hole 5 to the burner can be adjusted by the linear movement of the valve body 10. A medium or large fire can be easily obtained. In addition, since the conical taper portion 14 that is tapered toward the tip end is provided at the tip end portion of the third closing portion 13, the linear movement of the valve body 10 causes the outer peripheral surface of the taper portion 14 and the third seal surface 4 to move. Fine adjustment of the gap is facilitated, and accordingly, the amount of gas can be controlled gently when adjusting the medium thermal power, and the amount of gas can be controlled with high accuracy.
[0019]
4B, the second closing portion 12 of the valve body 10 is separated from the second seal surface 3, and the third closing portion 13 is in contact with the third seal surface 4 until the small fire adjustment position P2. When the valve body 10 is pushed down, the gas supplied from the other end 1c of the valve body 1 passes through the gap between the second closing portion 12 and the second seal surface 3 from the small fire gas passage 15 and passes through the horizontal hole 5. It will be supplied to a burner through this, and the amount of small fire gases can be obtained stably. At this time, the gas seal O-ring 18 attached to the third closing portion 13 comes into contact with the third seal surface 4 to further improve the accuracy of adjusting the small fire and stabilize the small fire. it can.
[0020]
Further, as shown in FIG. 4A, the second closing portion 12 is moved to the second closing portion 12 by pushing down the valve body 10 to the closing position P3 where the third closing portion 13 of the valve body 10 contacts the third seal surface 4. 2 The gas passage 6 can be blocked by contacting the seal surface 3. At this time, gas sealing is performed by the gas sealing O-ring 17 attached to the second closing portion 12, and the gas is reliably closed.
[0021]
Thus, since the second closing portion 12 is brought into close contact with the second seal surface 3 to close the gas, there is no problem that the O-ring for the valve seat separately provided is deformed as in the prior art. In the case of the drive type, there is a problem that a force to push the O-ring for the valve seat is applied when the gas is closed. However, in the present invention, the second closing portion 12 contacts the second seal surface 3 when the gas is closed. Since the gas can be reliably closed by simply making it, it is not necessary to increase the output of the drive unit 20. Further, since it is not necessary to use the valve seat O-ring 30 (FIG. 5) as a separate part as in the prior art, an increase in the number of parts of the valve body 1 can be prevented, and the structure can be simplified and the cost can be reduced. There is also an advantage.
[0022]
Further, the motor 21 with the worm gear 22 is used as the driving unit 20 and the driving unit 20 can be configured easily by stopping the rotation of the valve body 10 by the guide pin 24 inserted into the slit hole 25 of the valve body 1. Become. In addition, by stopping the rotation of the valve body 10 about the axis of the valve body 1 with the guide pin 24 and the slit hole 25, the linear movement amount of the valve body 10 can be finely adjusted by the rotation control of the worm gear 22. Especially, the adjustment accuracy of medium-fired thermal power can be increased.
[0023]
【The invention's effect】
As described above, in the first aspect of the invention, the inner surface of the valve main body includes the first seal surface having the largest inner diameter, the second seal surface having a smaller inner diameter than the first seal surface, and the second seal surface. A third seal surface having a smaller inner diameter is formed in this order from one end side to the other end side of the valve body, and a horizontal hole is provided in the first seal surface, A first closing portion that is in gas contact with the first seal surface at a position that does not block the lateral hole on the outer surface of the valve body that is slidably housed in the valve body, and the second seal surface Forming a second closing portion that comes into contact with and away from and a third closing portion that comes into contact with and away from the third seal surface, and forms a tapered portion at the tip of the third closing portion that becomes thinner. And a small fire gas passage having one end opened at the tip of the tapered portion and the other end opened at the outer surface of the third closing portion. Then, by driving the valve body in a certain range by the drive unit, the gas amount is changed by changing the gap between the second closing part and the second seal surface and the gap between the third closing part and the third seal surface. Medium fire / large fire adjustment range to be adjusted, the second closing portion is separated from the second seal surface, and the third closing portion is brought into contact with the third seal surface, so that the small fire gas passage is connected to the second closing portion and the second seal surface. A small fire adjustment position that communicates with the horizontal hole through the gap between the second closed portion and the closed position that closes the gas passage by bringing the second closing portion into contact with the second sealing surface and bringing the third closing portion into contact with the third sealing surface. Since the switching is possible, the medium-fired power can be adjusted easily and accurately by simply changing the gap between the third closing portion and the third seal surface, and the third closing portion and the third seal surface The small firepower can be adjusted easily and precisely simply by opening the small fire gas passage with the Good can be performed, it is possible to control the fire medium heat until small fire. In addition, since the gas closing is reliably performed by bringing the second closing portion into close contact with the second seal surface, there is no problem that the O-ring for the valve seat separately provided as in the conventional case is deformed. Even in this case, there is no need to increase the output of the drive unit, and furthermore, there is no need to use an O-ring for a valve seat as a separate part as in the prior art, thus preventing an increase in the number of parts of the valve body and simplifying the structure. And cost reduction.
[0024]
In addition to the effect of the first aspect, the invention according to the second aspect includes a gas seal O-ring on each outer peripheral surface of the first closing portion, the second closing portion, and the third closing portion of the valve body. Because it is installed, a gas seal between the first closing portion and the first seal surface during medium and large fire adjustment, a gas seal between the third closing portion and the third seal surface during small fire adjustment, and gas closing The gas seal between the second closing portion and the second seal surface at the time is surely performed by each O-ring.
[0025]
According to a third aspect of the present invention, in addition to the effect of the first aspect, the drive portion includes a motor with a worm gear, and the valve body meshes with the worm gear to convert the rotational motion of the worm gear into a linear motion. Since the spiral gear and the rotation prevention means that prevents the valve body from rotating around the axis of the valve body are provided, the rotation of the worm gear can be used to control the amount of linear movement of the valve body by controlling the rotation of the worm gear. In particular, it is possible to increase the adjustment accuracy of the medium-fired thermal power.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2A is a side view for explaining a small fire adjustment position, and FIG. 2B is a cross-sectional view.
FIG. 3A is a cross-sectional view illustrating the medium fire adjustment position of the above, and FIG. 3B is a cross-sectional view illustrating the large fire adjustment position of the same.
4A is a cross-sectional view when a gas is closed, and FIG. 4B is a cross-sectional view when a small fire is adjusted.
5A is a cross-sectional view of an example during medium fire adjustment, and FIG. 5B is a cross-sectional view of an example during large fire adjustment.
6A to 6C are cross-sectional views of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve main body 1a Inner surface 1b One end 1c The other end 2 The 1st sealing surface 3 The 2nd sealing surface 4 The 3rd sealing surface 5 The side hole 6 The gas passage 10 The valve body 11 The 1st closing part 12 The 2nd closing part 13 The 3rd closing part 14 Taper portion 15 Small fire gas passage 16, 17, 18 Gas seal O-ring 20 Drive portion 21 Motor 22 Worm gear 23 Spiral gear A Needle-type instrument plug P1 Medium / large fire adjustment range P2 Small fire adjustment position P3 Closed position

Claims (3)

One end of the valve body includes a first seal surface having the largest inner diameter, a second seal surface having a smaller inner diameter than the first seal surface, and a third seal surface having a smaller inner diameter than the second seal surface on the inner surface of the valve body. In this order from the side toward the other end, a horizontal hole is provided in the first seal surface, and a gas passage is formed between the horizontal hole and the other end of the valve body, and is slidably stored in the valve body. A first closing portion that is in sliding contact with the first seal surface at a position that does not block the lateral hole, a second closing portion that is in contact with and away from the second seal surface, and the second closing portion. A third closing portion that contacts the seal surface in a freely detachable manner, and a tapered portion that narrows toward the distal end of the third closing portion; and one end that opens at the distal end of the tapered portion and the other end Forms a small-fire gas passage opened on the outer surface of the third closing portion, and the valve body is driven within a certain range by the driving portion. By adjusting the gap between the second closing part and the second seal surface and the gap between the third closing part and the third seal surface, the medium and large fire adjustment range for adjusting the gas amount, and the second closing part A small fire adjustment position for separating the small fire gas passage from the gap between the second closing portion and the second sealing surface by separating the second sealing surface from the second sealing surface and bringing the third closing portion into contact with the third sealing surface. A needle-type instrument plug, wherein the second closing portion can be switched to a closing position in which the gas passage is closed by bringing the second closing portion into contact with the second sealing surface and bringing the third closing portion into contact with the third sealing surface. The needle-type instrument plug according to claim 1, wherein an O-ring for gas sealing is attached to each outer peripheral surface of the first closing part, the second closing part, and the third closing part of the valve body. The drive unit includes a motor with a worm gear, and a spiral gear for meshing the valve body with the worm gear to convert the rotational motion of the worm gear into a linear motion, and preventing the valve body from rotating about the axis of the valve body The needle-type instrument plug according to claim 1, further comprising a detent means.

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