JPS63149483A - Gas control device - Google Patents

Abstract

PURPOSE:To obtain the titled device of compact design and ensure a small pressure loss at a flow passage by locating the passage of a closer corresponding to a maximum bore orifice at the side of the closer having a bore larger than the bores of closer passages corresponding to other orifices. CONSTITUTION:Orifices 23 of different bores are arranged in flow passages 22 and the combination of the bores of the orifices 23 allowing a gas flow is selected, depending upon the stop position of a closer 18. A bore 20a as a closer flow passage corresponding to a maximum bore orifice 23a is provided at the side of the closer 18 with a bore larger than bores 20b to 20f corresponding to other orifices. According to the aforesaid constitution, the passage area of the bore 20a exposed to a maximum flow rate can be made spacious. Also, a pressure loss in the flow passage of a cock can be thereby made small and it becomes possible to obtain the titled device of compact design and to reduce a pressure loss in the flow passage thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The present invention is used for the purpose of adjusting the combustion amount of gas-fueled cookers, space heaters, and water heaters. The present invention relates to a gas flow rate control device that can be switched freely between the two directions.

BACKGROUND OF THE INVENTION Conventionally, this type of gas control device has a gas control device, as shown in FIGS. The cock body 3 is rotatably provided with a closing member 6 having a gas hole 4 on the side surface and an internal axial guide hole 5 communicating with the gas hole 4.
A first passage 7 with a small degree of constriction, a second passage 8 with a medium degree of constriction, and a third passage 9 with a large degree of constriction are provided in communication with the gas outlet 2 at each downstream end, and the Each gas hole 10.1 in the side surface of the closing member 6 has the first and second passages 7, 8 at each upstream end.
1 into the guide hole 5, and the third
The passage 9 is configured to open at its upstream end into a space 12 at the bottom of the cock body 3 that extends into the guide hole 5, so that the gas flow rate can 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 structure, the gas is
It enters from the slope, passes through the internal guide hole 5, and then enters the passage 7.8 on the side surface of the closure member 6 and the bottom opening 1 of the closure member 6.
Through the passage 9 connected to 2, the amount of drawing is regulated to small, medium, and large.
Since it comes out from gas intake port 2, the gas flow rate can be adjusted in 5 or 6 stages.
If it were to be possible to switch between stages, it would be necessary to increase the diameter of the closing member 6, and the passage of the gas cock body 3 would have to be configured in a complicated manner, making it unsuitable for mass production processing. It had problems such as being too large in external dimensions to be incorporated into household equipment.

The present invention solves such conventional problems, and aims to realize a gas control device that can switch the gas flow rate in multiple stages, maintains high flow rate accuracy, is small, has low flow rate pressure drop, and is easy to mass-produce. It is.

Means for Solving the Problems In order to solve the above problems, the gas control installation of the present invention includes:
a closure having a plurality of holes and grooves on its outer circumferential surface and switching to open and close a plurality of flow channels by rotating; a cock housing having a plurality of flow channels corresponding to the holes and grooves of the closure; and an orifice provided corresponding to each of the flow passages, and a guide hole in the internal axis direction of the closure, the bottom of the closure being open, and the closure corresponding to the orifice with the largest diameter among the plurality of orifices. The secondary flow passage is arranged closer to the large diameter portion of the tapered closure than the closure flow passages corresponding to other orifices.

Function The present invention has the above-described configuration, and by rotating the closure, a plurality of channels are switched to open and close, and the combination of channels through which gas flows can be selected in a preset state depending on the rotation stop position of the closure. Since each flow path has an orifice with a different hole diameter, the combination of holes in the orifice through which gas flows is selected depending on the closing position, and the combustion amount is gradually increased from the maximum combustion amount to the minimum combustion amount. 7. Since the throttle ratio at this time is determined by the hole diameter, it can be designed to be arbitrarily high, and since the flow rate accuracy only depends on the orifice hole diameter, a high level can be ensured. In addition, the gas enters through a guide hole in the internal axial direction of the closure whose bottom is closed, and flows through the holes and grooves of the closure to each orifice.There is also a structure in which the gas flow rate can be switched in 5 or 6 stages. It's easy.

In addition, the large-diameter side of the taper of the closure has a flow path corresponding to the largest diameter orifice, so even if the closure remains small in diameter, it can maintain a relatively large flow passage cross-sectional area, making it compact. while ensuring low flow path pressure loss.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIG. 1, a cock 17 provided in the middle of a gas flow path 16 is composed of a closing member 18 that rotates about a central axis and a cock housing 19 outside the closing member 18. The closure 18 has an external shape as shown in FIG. 2, and has a plurality of holes 20 in the axial direction.
a, 20b, 20c, 20d, 20e, 20f are provided, and grooves 21e, 21 with different lengths in the local direction connected to each hole
c, 21d, 21e, and 21f are formed. On the other hand, the cock housing 19 has a plurality of channels 22a, 22b, 22c, which are aligned with the height direction of the hole 2o of the closure 18.
22d, 22e, 22f penetrate in the radial direction, and on the outside thereof, orifices 23a, 23b, 23c123d123e1 having different diameters correspond to the plurality of flow paths 22, respectively.
23f is provided.

FIG. 3 shows the positional relationship in the rotational direction of the above-mentioned closure hole 20, groove 21, and flow path 22 of the housing 19. In a completely closed state based on the flow path 22 shown by the broken line, the holes 20 are provided in a line at the angle C, and each groove extends to the angle 2, E, H, and G positions. Groove 211 only hole 2
Corner /f closer to reference position A than 0f Provided between the opening and G.

Although the holes are formed in a line in both FIGS. 2 and 3, the operation remains the same no matter where they are located within the groove 21.

The orifice 23 may be formed independently for each flow path 22, but the configuration is simplified if the orifice 23 is assembled into a single orifice plate 24 as shown in FIGS. 1 and 4. Orifice 2
3, only the flow path 22g is made independent by a joint 25, and the others merge and are connected to a pilot burner and a main burner (not shown).

The upper end of the closure 18 becomes a cross-sectional shaft 26 that passes through a D-shaped hole 28 provided in the center of the rotating part of a position signal generator 27 having an appearance as shown in FIG. and is rotated by the motor drive section 30. Figure 6 (,), (
b) is rotated by a motor drive section 30 via a relay shaft 29. 6(a) and 6(b) show the relay shaft 29, which has a convex portion 32 that fits into a groove 31 provided on the end surface of the closing shaft 26, and an output shaft of the motor drive section 30 on the opposite side. A concave groove 34 into which the convex portion 33 is fitted is formed, and the convex portion 32 and the concave groove 34 are arranged in a perpendicular positional relationship.

The position signal generator 27 is arranged radially on the surface of a substrate having a pattern as shown in FIG. It is an abunlute type encoder that is turned on or off electrically. In Figure 7, the wide part is on and the narrow part is off. The terminals connected to each control ring are designated as 35a, 35b, 35c, and 35d, and the common terminal is designated as 36, and the 4-bit output signal according to the combination of on and off according to each angular position in Fig. 7 is as follows. It is as follows. Here, ON is expressed as 1 and OFF is expressed as 0.

The angles shown in the table above and in FIG. 7 correspond to the angles in FIG. 3. Therefore, since the positional relationship shown in FIG. 3 is a completely closed positional relationship, if the contact brush of the position signal generator 27 is located in area A when the closure is in this position, the closed position signal will be 1111. When it rotates counterclockwise and reaches the area, only the orifice 231 flows and gas is sent to the pilot burner, and the signal at this time is 1101. Next, in region F, the gas flows to all the orifices 23 in a state of maximum sintering, and the signal is oool. Further rotation causes orifice 2
The combination of 3 changes, and in region G, the main burner is in the minimum combustion state where only the flow flows through the orifice 23d, and the signal is 00.
It becomes 10.

The relationship between these d force signal patterns and the combustion amount at each position is stored in advance in the selection unit 37, and the target position signal based on the condition of the heated object and the start or stop command is compared with the master position signal. to select the rotation direction of the motor drive section 30. In this case, the determination unit 38 in the direction selection unit 37 determines that when starting from the fully closed position of the cock, the condition is satisfied that the pilot burner can be ignited first by turning it counterclockwise as shown in FIG. When performing a closing operation, the motor is rotated in the direction that can reach angle A fastest, and when changing the combustion amount, the direction is determined so that the motor is rotated in a direction that does not pass through the completely closed position. The W motion control section 40 performs operations such as turning on/off the motor current and applying the brake at a position where the motor should be stopped via the polarity switching section 39 which determines the polarity of the application to the motor drive section 30 based on this determination result.

In addition, the important content in the configuration is that in Fig. 1, the gas flow path 1
The gas entering from the hole 20. It communicates with the groove 21, and the plurality of flow paths 22 of the hatching 19 communicate with the plurality of orifices 23, but as shown in FIGS. 2 to 4, the orifice 23 with the largest diameter among the plurality of orifices
The hole 20a which is the flow path of the closure 18 corresponding to the hole 20a of the tapered closure 18 is set to This is because it is installed on the large diameter side.

In the above configuration, at the maximum flow rate, the hole/groove 20 of the closure 18
．． In addition to the fact that all the holes 21 communicate with the orifice 23, the hole 20a, which is a closed passage corresponding to the largest diameter orifice 23a, is connected to the hole 20a corresponding to the other orifices.
0b~20f! By providing I) on the large diameter side of the closure 18, the passage area of the hole 20a through which the largest flow rate can be kept wide, so the pressure loss in the flow path of the cock is reduced, and the small diameter closure In other words, it has the effect of being small and compact, ensuring low flow and path pressure loss.

Also, the fact that the hole 23a is located in the large diameter part of the closure 18 means that
Even if the diameter of the hole 23a is made relatively large, the occupied angle with respect to the rotation angle of the closure 18 does not become particularly large, so it is easy to design the flow rate to be switched in multiple stages with equal division of rotation angle. There is also the effect of

Furthermore, the expansion of the throttle ratio and the securing of the flow rate accuracy at each rotational position of the closure are achieved by the orifice 2 of the orifice plate 24.
Since it is determined by the diameter of 3, it can be easily achieved.

In addition, since all of the plurality of holes and grooves 20 and 21 for switching and opening and closing the plurality of flow paths by the rotation of the closure 18 are provided on the outer peripheral surface of the closure 18, all six orifices 23 are arranged in one sheet. The orifice plate 24 can be assembled into two orifice plates 24, which has a simple structure and a small number of parts, making it easy to mass-produce, and also has the advantage that gas types can be changed by simply replacing one orifice.

In the embodiment, the structure is explained in which the closure 18 is rotated by the motor 3o and the position is detected by the encoder 27 and the gas amount is switched to a predetermined amount.
Needless to say, the above effect can be similarly obtained even with a structure in which the switch is rotated and clicked to stop at each switching position. Further, the embodiment has been described as an example in which the gas flow path to the pilot burner can be opened and closed, and the gas amount to the main burner can be switched in five stages, but when used only for the main burner, the flow rate can be switched in six stages.

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

(1) The flow path of the closure corresponding to the largest diameter orifice is placed closer to the large diameter part of the closure than the flow paths of the closure corresponding to other orifices, so the gas amount can be switched in multiple stages. Nevertheless, it has the advantage of having a wide passage area, being small and compact, and achieving low flow path pressure loss.

(2) Since there is a flow path corresponding to the maximum orifice in the large diameter part of the closure, it has the unique effect of being easy to design so that the rotation of the closure can be changed in multiple stages at equal division angles. be.

(3) All orifices can be constructed from a single plate, making mass production and gas type conversion easy.

[Brief explanation of the drawing]

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 side view of a closure, and Fig. 3 is a hole and groove of the closure and a flow path provided in the housing. Figure 4 is a front view of the orifice plate on which a large number of orifices are formed, Figure 5 is a front view of the somatic signal generator, and Figure 6 is a front view of the relay shaft and the flt11 plane. Figure, 7th
The figure is a pattern diagram of the sliding contact surface of an Abunlute type encoder, Figures 8 to 15 are conventional examples, Figure 8 is a partial sectional view of the cock, Figure 9 is a front view of the closure, and Figure 10 is its A sectional view of the closure, FIGS. 11 to 14 are diagrams showing the opening/closing relationship of each member at each angular position, and FIG. 15 is a diagram showing changes in gas amount. 17...Cock, 18...Closing, 19...Song/Cook-hucking, 20...Hole, 21...
Groove, 22...multiple channels, 23...orifice, 41...guiding hole. Name of agent: Patent attorney Toshio Nakao and 1 other person17
-Ko Tsuku Figure 2 (, A) (B'n Figure 3 Figure 4 Tohehonihalo Tsu Figure 5 Figure 6 (α) (b) □7゜To Figure 8

Claims (1)

[Claims] a closure having a plurality of holes and grooves on its outer circumferential surface and switching to open and close a plurality of flow channels by rotating; a cock housing having a plurality of flow channels corresponding to the holes and grooves of the closure; and an orifice provided corresponding to each of the flow passages, and a guide hole in the internal axis direction of the closure, the bottom of the closure being open, and the closure corresponding to the orifice with the largest diameter among the plurality of orifices. A gas control device in which a secondary passage is arranged closer to the large diameter portion of the tapered closure than the closure passage corresponding to another orifice.