JPH0743041B2 - 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 holes 10 and 11 are brought into contact with each other to open in the guide hole 5, and the third passage 9 is located in the space 12 at the bottom of the cock body 3 which is connected to the guide hole 5 at its upstream end. It was configured to open, and the gas flow rate could be switched in three stages. (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 gas holes 4 on the side surface of the same, 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 that connects to the bottom opening 12 of the closing member 6 Since it is regulated by a large amount of throttling in three stages and comes out from the gas intake port 2, if it is attempted to switch the gas flow rate to multiple stages such as five stages or six stages, the diameter of the closing member 6 will be increased. It is unsuitable for mass-production processing because it has to be upsized and the passage of the gas cock body 3 must be complicatedly configured, and it is large in external dimension to be embedded and mounted in household appliances. It had problems such as too much.

The present invention is intended to solve such a conventional problem, and is intended to realize a gas control device in which the gas flow rate can be switched in multiple stages by a motor, and the flow rate accuracy is high, and which is small and easy to mass-produce. In particular, it is intended to realize a multi-stage switching gas amount control device having excellent durability, which is configured to easily secure machining accuracy such as circularity and straightness of the closure.

Means for Solving the Problems In order to solve the above problems, the gas control device of the present invention is
A closure that has a plurality of holes / grooves on its outer peripheral surface to switch and open / close a plurality of flow paths by rotating, and an orifice provided corresponding to each of a plurality of flow paths corresponding to the holes / grooves of the closure. A position signal generator attached to the shaft of the closure in which the groove has a circumference that is short in the vicinity of the shaft of the closure and long in the distance, and a plurality of stop positions of the closure and a plurality of each of the plurality of stop positions. A determination unit that receives a signal from the position signal generator, which is an absolute encoder that generates different bit signals corresponding to non-stop positions between the stop positions, and a closure unit that receives a signal from the determination unit. It is provided with a drive control unit that controls a motor that is rotationally driven.

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 flows to each orifice through holes / grooves on the outer peripheral surface, which is the side surface of the closure, and the structure that switches the gas flow rate to 5 or 6 steps is simple. If easy In particular, since the groove of the closure is short near the axis of the closure and long near the tip of the closure far from the axis, the axis of the closure is chucked when cutting the outer peripheral surface of the closure. When cutting with a blade while rotating with a blade, since the vicinity of the axis of the closure has only a short groove, the flexure strength of the closure is high and so-called chattering is unlikely to occur. Therefore, machining accuracy such as circularity, straightness, and surface roughness of the closure can be stably obtained.
Contrary to this, in the machining experiment with the groove on the side closer to the axis of the closure made longer, chattering occurred during cutting, roundness, straightness,
Stable machining accuracy was not obtained with the surface roughness, and after assembly as a cock, a result of an operation endurance test of reciprocating rotation of the closure showed that the target number of times was not satisfied and the grease was partially stuck and stuck, or closed. Also, the sliding surface of the cock housing was scratched, causing leakage failure. In this respect, the structure of the present invention described above was able to stably satisfy the target number of times of operation durability.

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 contact 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 direction is determined such that the motor is rotated in the direction in which the angle b can be reached the earliest, and when the combustion amount is changed, the motor is rotated in the direction in which the complete opening position is not passed. 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.

As shown in FIGS. 2 and 3, the grooves 21b and 21c of the closure 18 near the shaft 26 are short, and the grooves 21e and 21f far from the shaft 26 are long.

In the above configuration, by rotating the closing member 18, the combination of the flow paths 22 through which the gas flows is selected in a preset state, and the combination of the orifices 23 is made. Can be changed to. The gas flow rate at each stage at this time is the orifice plate 24
Since it is determined by the hole diameter of the orifice 23, it can be designed arbitrarily and its flow rate accuracy can be secured at a high level. Further, the gas is configured to flow to each orifice 23 through the hole 20 and the groove 21 on the outer peripheral surface which is the side surface of the closing member 18, and the structure in which the gas flow rate is switched to 5 steps or 6 steps is also shown in FIGS. 1 to 4. As easy as
Since the flow path 22 is also simple, it is small and easy to mass-produce by aluminum die casting. Especially when closing the groove 21 of the closure 18,
Since the circumference of the shaft 18 of the 18 is short and the length of the tip of the closure far from the shaft 26 is long, the shaft 26 of the closure 18 is chucked when cutting the outer peripheral surface of the closure 18. When the blade is cut with a blade while being rotated while being rotated, since there are only short grooves 21b and 21c in the vicinity of the shaft 26 of the closing member 18, the closing member 18 has high strength against bending, and so-called chattering is unlikely to occur. Thus closed
The 18 roundness, straightness, surface roughness, etc. act in a stable manner to obtain processing accuracy, and have the unique effect of ensuring excellent operating durability. This effect is the same for the groove depth and the groove width.

Further, since all of the plurality of holes 20 and the grooves 21 for switching and opening the plurality of flow paths 22 by the rotation of the closing member 18 are provided on the outer peripheral surface of the closing member 18, all the six orifices 23 are formed as one sheet. The orifice plate 24 can be collectively configured, and the structure is simple, the number of parts is small, and gas species can be changed by replacing one orifice plate 24.

Further, the gas control system of this embodiment includes a position signal generator 27 attached to the shaft 26 of the closure 18 and a plurality of four stop positions A, D, F, H, J, L, N of the closure 18. Non-stop positions B, C, E, G, I, K, M, O, P
To the position signal generator 27, which is an absolute encoder that generates different bit signals corresponding to
Since the drive control unit 40 that controls the motor 30 that rotationally drives the 18 is provided, the rotation position of the closure 18 can always be accurately grasped, and a non-stop position signal between each stop position can be obtained. Brake control can be performed at the position where the motor 30 is decelerated from the signal before the stop position or switched to the stop position bit signal, and the motor 30 and the closure 18 can be stopped at the target gas flow position without overrun. . This works in the same manner in both forward and reverse rotations of the motor 30 and the closure 18, and is capable of accurately performing gas multistage flow rate switching control with excellent durability and high accuracy.

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

(1) Since a plurality of holes / grooves for switching and opening / closing a plurality of flow paths by turning the closure are provided on the outer peripheral surface of the closure and communicated with the orifices simultaneously and separately, high flow rate accuracy is ensured. Therefore, there is an effect that it is possible to realize a gas control device which is small and easy to mass-produce.

(2) Since the groove of the closure is formed with a short circumference near the axis of the closure and a long circumference far away, stable machining accuracy such as roundness, straightness and surface roughness of the closure can be obtained. Excellent operating durability can be ensured.

(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 the unique effect that the gas multi-step flow rate switching control with excellent durability and high accuracy can be accurately obtained.

[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, FIGS. 2A and 2B are front and side views of a closure, and FIG.
FIG. 4 is a development view showing the positional relationship between the hole of the closure and the groove and the flow path provided in the housing. FIG. 4 is a front view of an orifice plate having a large number of orifices. FIG. 5 is a front view of the position signal generator. Figures 6a and 6b are front and side views of the relay shaft,
Fig. 8 is a pattern diagram of the sliding contact surface of an absolute encoder, Fig. 8 to Fig. 15 are conventional examples, Fig. 8 is a partial sectional view of a cock, Fig. 9 is a front view of a closure, and Fig. 10 is the same. 11 is a sectional view of the closing member, FIG. 11 to FIG. 14 are diagrams of opening and closing relations of respective members at respective angular positions, and FIG. 15 is a diagram of changes in gas amount. 17 …… cock, 18 …… closed, 19 …… cock housing,
20 ... hole, 21 ... groove, 22 ... multiple flow paths, 23 ... orifice, 26 ... axis.

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. Position signal generator attached to the shaft of the closure in which the housing, the orifices respectively provided for the plurality of flow paths, and the groove are arranged with a peripheral length that is short near the shaft of the closure and long in the distance. And a signal from the position signal generator, which is an absolute encoder that generates different bit signals corresponding to a plurality of stop positions of the closure and non-stop positions between the plurality of stop positions, respectively. And a drive control unit that controls a motor that rotationally drives the closure in response to a signal from the determination unit.