JPH0743042B2 - Gas control equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention is used for the purpose of adjusting the combustion amount of a gas-cooked cooker, heater, or water heater, and in particular, the gas amount can be changed in a plurality of stages by rotating the closure. The present invention relates to a gas flow rate control device that can be switched to.

2. Description of the Related Art Conventionally, as shown in FIGS. 8 to 15, a gas control device of this type has a gas cock body 3 having a gas intake port 1 and a gas intake port 2 and cooperates with the gas intake port 1. A cock member 3 having a gas hole 4 on the side surface and an inner axial guide hole 5 that communicates with the gas hole 4.
First passage 7 with a small degree of narrowing and second passage 8 with a medium degree of narrowing
And a third passage 9 having a large degree of narrowing are provided so as to communicate with each other in the gas outlet 2 at each downstream end, and the first and second passages 7, 8 are provided at each upstream end on the side surface of the closing member 6. The gas passages 10 and 11 are opened to the inside of the guide hole 5, and the third passage 9 is opened at its upstream end into the space 12 at the bottom of the cock body 3 which is connected to the guide hole 5. The gas flow rate can be switched among three levels. (For example, Japanese Utility Model Publication No. 59-21324) Problems to be Solved by the Invention However, in the above-described configuration, the gas is used as the closing member 6
From the side surface, through the inner guide hole 5, and again through the passages 7 and 8 on the side surface of the closing member 6 and the passage 9 connected to the bottom opening 12 of the closing member 6 to reduce the amount of small, medium and large. Since the system is regulated and comes out from the gas intake port 2, it is necessary to increase the diameter of the closing member 6 if the gas flow rate can be switched to 5 or 6 steps, and the passage of the gas cock body 3 is changed. Due to the fact that it has to be constructed in a complicated manner, it has problems that it is not suitable for mass production processing, and that the external dimensions are too large to be embedded and mounted in household appliances.

The present invention solves such a conventional problem, and an object of the present invention is to realize a gas control device in which a gas flow rate can be switched in multiple stages by a motor, and the flow rate accuracy is ensured to be high, which is small in size and easy to mass-produce with low flow rate pressure loss. It is a thing.

Means for Solving the Problems In order to solve the above problems, the gas control device of the present invention is
A closure having a plurality of holes / grooves on its outer peripheral surface for switching and opening / closing a plurality of flow paths by rotating; a cock housing having a plurality of flow paths corresponding to the holes / grooves of the closure; Of the orifices provided corresponding to the respective flow paths of the above, and a guide hole in the direction of the internal axis of the closure, the bottom of the closure being opened, and the closed orifice corresponding to the largest diameter orifice among the plurality of orifices. A position signal generator attached to the shaft of the closure, the flow path of the child being disposed on the larger diameter side of the tapered closure than the closure flow paths corresponding to other orifices; A plurality of stop positions and a determination unit that receives a signal from the position signal generator that is an absolute encoder that generates different bit signals respectively corresponding to non-stop positions between the plurality of stop positions, and the determination unit Drives the closure by receiving the signal from Those with a drive control unit for controlling the that motor.

The present invention has the above-described configuration, and switches and opens and closes a plurality of flow paths by rotating the closure with a motor. The combination of gas flow paths is changed depending on the rotation stop position of the closure, and the gas flow rate is changed in multiple stages. Can be variably controlled. Since each flow path has orifices with different hole diameters, it means that a combination of orifice holes through which gas flows is selected depending on the closing position, and the maximum combustion amount to the minimum combustion amount can be changed stepwise. it can. Since the throttle ratio at this time is determined by the hole diameter of the orifice, it can be designed arbitrarily high, and its flow rate accuracy depends on the hole diameter of the orifice, so a high level can be secured.

In addition, the gas enters from the guide hole in the direction of the internal axis of the closure whose bottom is opened and closed, and flows to each orifice through the holes and grooves of the closure. There is also a structure that switches the gas flow rate to 5 or 6 steps. It's easy. In addition, since the flow path corresponding to the maximum diameter orifice is configured on the large diameter side of the taper of the closure, even if the size of the closure is small, it can hold a relatively large flow passage cross-sectional area A low flow path pressure loss can be secured.

Furthermore, with a position signal generator attached to the axis of the closure and an absolute encoder that generates different bit signals corresponding to the multiple stop positions of the closure and the non-stop positions between the multiple stop positions. Since the determination unit that receives the signal from the position signal generator and the drive control unit that controls the motor that rotationally drives the closure by receiving the signal from the determination unit are provided, the rotation position of the closure is always accurate. In addition to obtaining the non-stop position signal between each stop position, it is possible to perform brake control at a position where the signal before the stop position is used to decelerate the motor or switch to the stop position bit signal. The closure can be stopped at the target gas flow rate position without overrunning the motor and the closure. This is the same in both forward and reverse rotations of the motor and the closure, and is highly durable and enables highly accurate gas multistage flow rate switching control.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, a cock provided in the middle of the gas passage 16
Reference numeral 17 is composed of a closure 18 which rotates about a central axis and a cock housing 19 outside the closure 18. The closure 18 has an external shape as shown in FIG. 2 and has a plurality of holes 20a, 20b, 20c,
20d, 20e, 20f are provided, and grooves 21e, 21c, 21d, 21e, 21f connected to the holes and having different circumferential lengths are formed. On the other hand, in the cock housing 19, a plurality of flow paths 22a, 22b, 22c, 22d, 22e, 22f are radially penetrated so as to coincide with the height direction of the hole 20 of the closure 18, and the outside thereof is the above-mentioned. Orifices 23a, 23b, 23c, 23d, 23e and 23f having different diameters are provided corresponding to the plurality of flow paths 22, respectively. FIG. 3 shows the positional relationship in the rotational direction of the above-mentioned closed hole 20, groove 21, and flow path 22 of the housing 19. In the completely closed state based on the flow path 22 shown by the broken line, the holes 20 are provided in a line at the position of the angle C, and each groove extends to the positions of the angles D, E, F, and G. Groove 21f only hole 2
It is provided between angles b and g closer to the reference position a than 0f. Each hole was formed in a row in both Fig. 2 and Fig. 3, but
If the position is within the range of 21, the operation is the same. The orifices 23 may be formed independently for each of the flow paths 22, but the configuration is simplified by combining them as a single orifice plate 24 as shown in FIGS. 1 and 4. Orifice 23
In the downstream side after passing through, only the flow path 22f is independent by the joint 25, and the other are joined and connected to a pilot burner and a main burner (not shown).

The upper end of the closing member 18 becomes a shaft 26 having a D-shaped section, and penetrates a D-shaped hole 28 provided at the center of the rotating portion of the position signal generator 27 having the appearance shown in FIG. And is rotated by the motor 30. 6 (a) and 6 (b) are rotated by a motor 30 via a relay shaft 29. FIG. 6 (a),
(B) shows a relay shaft 29, which has a convex portion 32 that fits into a groove 31 provided on the end surface of the closed shaft 26, and a motor 30 on the opposite side.
A concave groove 34 into which the output shaft 33 is fitted is formed, and the convex portion 32 and the concave groove 34 are arranged at a right angle positional relationship.

The position signal generator 27 rotates 4 times while the sliding brushes arranged in the radial direction on the surface of the substrate having the pattern as shown in FIG. 7 rotate while coming into contact with the innermost common surface. Is an absolute encoder that turns on and off electrically. In FIG. 7, the wide portion is on and the thin portion is off. The terminals connected to each control ring
35a, 35b, 35c, 35d, a common terminal 36, and a 4-bit output signal according to the combination of ON and OFF according to each angular position in FIG. 7 are as follows. Here, ON is expressed as 1 and OFF is expressed as 0.

The angle and the angle in the above table and FIG. 7 correspond to those in FIG. Therefore, in the positional relationship of FIG. 3, the positional relationship is completely closed. Therefore, if the contact brush of the position signal generator 27 is arranged in the area A when the closure is in this position, the closed position signal is 1111. If it rotates counterclockwise and reaches the area D, only the orifice 23f flows and gas is sent to the pilot burner. The signal at this time is
It is 1101. Next, in the area F, all orifices 23
The signal is 0001, which is the state of maximum combustion in which gas flows. Further rotation changes the combination of the orifices 23, and in the area G, the main burner is in the state of minimum combustion flowing only through the orifice 23d and the signal becomes 0010.

The relationship between the output signal pattern and the combustion amount at each position is previously stored in the direction selecting unit 37, and the motor 30 is compared by comparing the target position signal with the current position signal according to the condition of the object to be heated or a start or stop command. Select the rotation direction of. In this case, the determination unit 38 in the direction selection unit 37, when starting from the completely closed position of the cock, turns counterclockwise as shown in FIG. 7 to satisfy the condition that the pilot burner can ignite first, When the closing operation is performed, the motor is rotated in the direction in which the angle b can be reached earliest, and when the combustion amount is changed, the direction is determined such that the motor is rotated in the direction not passing through the completely closed position. Through the polarity switching unit 39 that determines the polarity of energization to the motor 30 based on this determination result, the drive control unit 40 performs operations such as on / off of the motor current and brake control for applying a brake at a position where the motor current should be stopped.

Further, in FIG. 1, the gas entering from the gas flow path 16 passes through the guide hole 41 provided in the inner axis direction of the closure 18 and then passes through the closure 18.
Through the hole 20 and groove 21 of the cock housing 19
From 22 to a plurality of orifices 23,
As shown in the figure, among the plurality of orifices, the hole 20a which is the passage of the closing member 18 corresponding to the orifice 23a having the largest diameter, the holes 20b corresponding to the other orifices 23b, 23c, 23d, 23e and 23f, 20
It is provided on the larger diameter side of the tapered closing member 18 than the c, 20d, 20e, and 20f.

With the above configuration, at the maximum flow rate, holes / grooves 20 and 21 of the closure 18
Except that all of them work so as to communicate with the orifice 23, the hole 20a, which is a closed passage corresponding to the orifice 23a having the largest diameter, has a larger diameter than the holes 20b to 20f corresponding to other orifices. By providing it on the side of the section, the passage area of the hole 20a through which the largest flow rate can be held is wide, so that the flow passage pressure loss of the cock acts to be small, and the small diameter closure, that is, compact and low flow passage pressure loss is secured. The effect is that you can do it.

The fact that the hole 23a is in the large diameter part of the closure 18 means that the hole 23a
Even if the diameter is relatively large, the occupying angle with respect to the rotation angle of the closure 18 does not become particularly large.Therefore, it is a unique effect that it is easy to design so that the flow rate can be switched in multiple stages at equal rotation angles. There is also.

Further, the expansion of the throttle ratio and the securing of the flow rate accuracy at each rotation position of the closing member can be easily achieved because the diameter of the orifice 23 of the orifice plate 24 is determined.

Also, since all of the plurality of holes / grooves 20 and 21 for switching and opening and closing of a plurality of flow paths by the rotation of the closing member 18 are provided on the outer peripheral surface of the closing member 18, all six orifices 23 are provided as one sheet. The orifice plate 24 can be collectively constructed, has a simple structure, has a small number of parts, and is easily mass-produced. Further, there is an effect that a single kind of orifice can be exchanged for gas type conversion.

Further, the gas control device of the present embodiment, the position signal generator 27 attached to the shaft 26 of the closure 18, a plurality of each stop position A, D, F, H, J, L, N of the closure 18. Non-stop positions B, C, E, G, I, K, M, O, and P that receive different signals from the position signal generator 27, which is an absolute encoder that generates different bit signals, respectively. And a signal from the decision unit 38
By including the drive control unit 40 that controls the motor 30 that rotationally drives, the rotation position of the closure 18 can be always accurately grasped, and the non-stop position signal between each stop position can be obtained. Brake control can be performed at a position where the motor 30 is decelerated from the signal before the position or is switched to the stop position bit signal, and the motor 30 and the closure 18 can be stopped at a target gas flow position without overrun.
This acts in the same manner in both forward and reverse rotations of the motor 30 and the closure 18, and enables highly accurate multistage gas flow rate switching control.

Effects of the Invention As described above, the gas control device of the present invention has the following effects.

(1) Since the closed flow path corresponding to the maximum diameter orifice is arranged on the larger diameter side of the closure than the closed flow paths corresponding to other orifices, the gas amount can be switched in multiple stages. Nevertheless, there is an effect that a wide passage area can be held, a compact size and a low flow path pressure loss can be achieved.

(2) Since there is a flow path corresponding to the maximum orifice in the large diameter portion of the closure, the rotation of the closure can be switched in multiple stages at equal division angles.

(3) In combination with the configuration and effects described above, a position signal generator attached to the axis of the closure and different bit signals corresponding to the non-stop positions between the plurality of stop positions of the closure are generated. Since the determination unit that receives the signal from the position signal generator that is an absolute encoder and the drive control unit that receives the signal from the determination unit and controls the motor that rotationally drives the closure are provided, The child can be stopped at the target gas flow rate position without overrunning, and a small size and high precision gas multi-stage flow rate switching control can be accurately achieved.

(4) Since all the orifices can be configured by one plate, mass production processing and gas species conversion can be easily performed.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a gas control device according to an embodiment of the present invention, FIG. 2 is a front view and a side view of a closure, and FIG. 3 is a hole and groove of the closure and a flow path provided in a housing. 4 is a front view of an orifice plate having a large number of orifices, FIG. 5 is a front view of a position signal generator, FIG. 6 is a front view and a side view of a relay shaft, FIG. 7 is a pattern diagram of the sliding contact surface of the absolute encoder,
8 to 15 are conventional examples, FIG. 8 is a partial sectional view of a cock, FIG. 9 is a front view of a closure, FIG. 10 is a sectional view of the closure, and FIGS. FIG. 15 is a diagram of the opening / closing relation of each member at each angular position, and FIG. 15 is a diagram of changes in gas amount. 17 …… cock, 18 …… closed, 19 …… cock housing,
20 ... holes, 21 ... grooves, 22 ... multiple flow paths, 23 ... orifices, 41 ... guide holes.

Claims (1)

[Claims] Claim: What is claimed is: 1. A cock having a plurality of holes / grooves on its outer peripheral surface, which is opened and closed to switch and open / close a plurality of flow paths, and a cock having a plurality of flow paths corresponding to the holes / grooves of the closure. A housing, an orifice provided corresponding to each of the plurality of flow paths, and a guide hole in the inner axis direction of the closure, the bottom of the closure being opened, and the orifice having the largest diameter among the plurality of orifices. A position signal generator attached to the shaft of the closure, the flow path of the closure corresponding to the above is arranged on the larger diameter side of the tapered closure than the closure flow paths corresponding to other orifices. And a determination unit that receives a signal from the position signal generator, which is an absolute encoder that generates different bit signals respectively corresponding to a plurality of stop positions of the closure and non-stop positions between the plurality of stop positions. And the signal from the judgment unit Gas control apparatus including a driving control unit for controlling a motor for rotationally driving the.