JPS63149485A - Gas control device - Google Patents

Abstract

PURPOSE:To prevent an overcurrent generated in a motor and lessen an impact load on a reduction gear by sending a drive stop signal in the reversal time of a motor drive part for turning a cock and then a reversal signal after the elapse of the predetermined time. CONSTITUTION:A cock 17 is constituted from a closer 18 having a plurality of holes and a housing 19 forming a plurality of flow passages continuous to each hole of a porous orifice plate 24, and flow control is made adjustable step by step via the turn of the cock 17. There are provided a position judgement unit 35 for judging the position of the cock 17 upon receipt of a signal from a cock position signal generator 28, an operation control unit 36 for receiving a target position signal and a signal from the position judgement unit 35, a drive control unit 37 for receiving a signal from the operation control unit 36 and a timer unit 40. According to the aforesaid constitution, when the target position has been instructed in a reverse direction during the operation of a motor drive part 31, an emergency stop signal is outputted and after delaying an operation for the predetermined time with the timer unit 40, a reversal signal is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used for the purpose of regulating the combustion rate of gas-fueled cookers, space heaters, and water heaters, and particularly for regulating the amount of gas flow driven by electrical means. This relates to a control device.

Conventional Technology There are many applications in which it is necessary to adjust the amount of gas burned depending on the state of the object to be heated, and there are many cases where this is done by manipulating the amount of electricity. The simplest but frequently used example is a control device consisting of a solenoid valve array shown in FIG.

A plurality of electromagnetic valves 3 are arranged in parallel in the middle of a gas flow path 2 leading to a burner 1, and each electromagnetic valve is constituted by an orifice 4 having a different hole diameter in series. The maximum amount of combustion occurs when all solenoid valves are open, and the minimum amount of combustion occurs when only the solenoid valve with the smallest diameter is used. During this time, the combustion amount can be changed in stages by a combination of a plurality of solenoid valves. Of course, combustion will stop if all solenoid valves are closed.

Next, FIG. 9 shows an example used when it is necessary to continuously change the combustion amount. A valve hole 8 provided in the gas flow path 5 and extending from the inlet 6 to the outlet lower, and a valve body 9 corresponding to the valve hole 8 are supported at the other end by the guyar 7 ram 1o,
A permanent magnet 11 is attached. An electromagnet 1 consisting of a Fa iron core 12 and an excitation coil 13 faces a permanent magnet 11.
4 is provided, and the amount of gas flowing through the gas flow path 5 is adjusted according to the amount of current applied to the excitation coil 13. In other words, the excitation coil is arranged so that the polarity of the magnetic core 12 is in the direction that generates a repulsive force with the permanent magnet 11. 13, the valve element 9 separates from the valve hole 8 and gas begins to flow. At this time, the gas pressure at the outlet lower is determined by the above-mentioned repulsive force and the timer flamm 10.
Since it is determined by the effective pressure receiving area of , it is possible to adjust the gas pressure supplied to the downstream burner by the amount of current applied to the excitation coil 13. In addition, since the permanent magnet 11 generates an attractive force with the magnetic core 12 when no current is applied, the flow of gas can be stopped by providing a flexible elastic body 15 on the surface of the valve body 9. It had become. (For example, see Utility Model Publication No. 55-49137).

Problems to be Solved by the Invention However, with the above configuration, the example shown in FIG. 8 requires a large number of solenoid valves, which not only increases the cost but also increases the size of the control device, making it difficult to store it in the applied equipment. However, since the total amount of current flowing in the fully open state is high, the heat generated has an adverse effect on peripheral equipment, and the power supply circuit becomes larger and more expensive. In addition, in the example shown in FIG. 9, there is a limit to the ratio of the minimum flow rate to the maximum flow rate, that is, the restriction ratio, and normally when the ratio is about 174 or less, the valve hole 8
Since the gap between the gas and the gas supply became extremely small, the relationship between the amount of current applied and the gas supply pressure was unstable with poor reproducibility, resulting in a state of partial contact. For this reason, it is unsuitable for applications in which it is desired to arbitrarily obtain a practical aperture ratio. Furthermore, because the relationship between the amount of current and gas pressure differs depending on the product due to manufacturing errors in the permanent magnets and magnetic circuits, it was necessary to set current values corresponding to the maximum and minimum combustion amounts during manufacturing. Furthermore, since the pressing force on the valve part in the stopped state is based on the attraction force of the permanent magnet, it is weak, and reliable airtightness cannot be expected.

The present invention (7) aims to solve the above-mentioned conventional problems, and it is possible to obtain an arbitrarily high throttle ratio of the gas pipe, and its flow rate accuracy is high, and the power required for operation is extremely small, and it is highly durable. It is intended for this purpose.

A gas control device according to the present invention includes a cock located in a gas flow path that switches to open and close a plurality of parallel flow paths; an orifice plate having porous holes corresponding to each of the plurality of flow paths, a motor drive unit that rotationally drives the cock, a position signal generator attached to the shaft of the cock, and a position signal generator that receives the signal and determines the cock position. a position determination section, a calculation control section that receives a target position signal and a signal from the position determination section, a drive control section that receives a signal from the calculation control section and sends a drive signal to the motor drive section, and the motor drive section. 11, which has a timer section that sends out a drive stop signal when the signal is inverted, and sends out a reversal signal after a predetermined period of time.

Function Since the present invention has the above-described configuration, the cock, which is rotated by the force of the motor drive unit, switches and opens and closes a plurality of flow channels, and the combination of flow channels through which gas flows is determined in advance depending on the position where the cock stops. You can select the set state Bz. Each flow path has an orifice plate with holes of different diameters, so the combination of holes in the orifice plate through which gas flows is selected depending on the stop position of the cock.9 There are stages from the maximum combustion amount to the minimum combustion amount. can be changed. 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 hole diameter of the orifice, a control bell can be ensured. Next, in the position determining section for stopping the cock, a position signal generator attached to the cock shaft constantly monitors the current position, including not only the position where the cock should be stopped but also intermediate positions where it should not be stopped. When the target position for changing the combustion amount changes, the arithmetic control unit determines whether it should be rotated clockwise or counterclockwise based on the relationship with the current position, and then drives the motor via the drive control unit. Transmits a signal and rotates the cock. The position of the cock is constantly determined by a position determination section based on a signal from a position signal generator, and when the target position is reached, the motor drive section is stopped and the gas amount is changed in steps. When the motor drive section is reversed, the drive control section sends out a drive stop signal, the timer section delays the time enough for the motor drive section to stop, and then a reversal signal is sent to the motor drive section.

Embodiment Next, an embodiment of the zero hatching moe will be described based on the drawings. In FIG. 1, a hook 1 provided downstream of the gas on-off valve 16
7 is composed of a closing member 18 that rotates around the central axis and a housing 19 outside of the closing member 18.

The closure 18 has an external shape as shown in FIG. 5, and has a plurality of holes 20a, 20b, 20c, 20d, and 20e in the axial direction.
Grooves 21b with different lengths in the circumferential direction connecting each person
, 21c, 21d, and 21e are formed. The hole 20 and the groove 21 are arranged in an angular relationship as shown in FIG. 2 when developed.

On the other hand, the hatching 19 has a plurality of channels 22 a , 22 b s2 aligned with the height direction of the hole 20 of the closure 18 .
2 c s 22 d s 22 e penetrates in the radial direction, and on the outside thereof, there are porous holes 23 a, 23 b, 23 c, 23 d, 2 with different diameters corresponding to the plurality of flow paths 22, respectively.
An orifice plate 24 having a shape 3e is provided. On the downstream side of the orifice plate 24, the flow paths are grouped together by a joint 25 and connected to a burner (not shown). FIG. 3 shows only the orifice plate 24. Next, Closure 1B
The upper end is a cross-sectional shaft 26, and the end face has a straight groove 27.
is provided. The D-shaped shaft 26 passes through a D-shaped hole 29 provided in the center of a rotating part of a position signal generator 28 such as an encoder or potentiometer, and is driven by a motor drive part 31 having an output shaft 30 that engages with a straight groove 27. be rotated. Typically, the motor drive unit 31 is comprised of a motor 32 and a reduction gearbox 33 to increase torque. FIG. 4 shows a position signal generator 28 using a 4-bit encoder, which is an example of a contact type having a pattern as shown in FIG. The rotating part that rotates at the same time as the shaft 26 has a sliding brush in the radial direction, and rotates while simultaneously contacting the innermost contact surface with the four outer rings, and is electrically turned on at the shaded part in the figure. state. Now, on is expressed as 1, on is expressed as O, and 7 is shown in order from the inside. At an angle of 0 degrees, it is 1111, the middle up to an angle of 60 degrees is 1110, and the angle of 60 degrees is 1.
101. The intermediate value up to an angle of 120 degrees is 1100, and the angle is 12.
0 degrees is 1o11, the middle up to 180 degrees is 1010,
An angle of 180 degrees is 1001. 1 for intermediate angles up to 240 degrees
000, 0111 for an angle of 240 degrees, 0110 for an intermediate angle up to 300 degrees, and 0101 for an angle of 300 degrees. The middle point between the angle and 0 degrees is 0100. Since the combination of these on/off signals changes with the rotation of the closure 18, the angle in the closure development diagram in FIG. 2 should match the angle in the encode pattern diagram in FIG.
If the position of the plurality of flow passages 22 provided in the Indicates the position of maximum combustion amount flowing, 101
The signal gradually decreases from 1 to 1001.0111, and the signal 0101 indicates 7, which is the position of the minimum amount of combustion flowing only through the holes 23e. Such a cock position is determined by the position determining circuit 34 upon receiving a signal from the position signal generator 28, and both of them constitute a position determining section 35. Next, the target position signal based on the condition of the heated object and the command to start or stop, and the current position signal from the position determination section 35 mentioned above are given to the calculation control section 36. 37 is a drive control section, which includes a start/stop control section 38 and a speed control section 39;
The signal No. 6 starts and stops the rotation of the motor 32, switches the rotation direction, and adjusts the rotation speed. 4
0 is a timer that delays the signal to the drive control section 37 for a predetermined period of time.

Next, the operating state will be described. - For example, in the pattern diagram shown in Figure 6, from angle 0° (code 1111) to angle 12
The case of changing to 0° (code 1011) will be explained. When a command to move from an angle of 0° to an angle of 12 cP is output, the rotation direction is clockwise in FIG. 6, the supply voltage is set to the maximum, and is sent to the start/stop control unit 38 and the speed control unit 39.
The motor 32 is supplied with maximum power and started. As the motor 32 rotates, the detection hood of the position signal generator 2 changes, and when the angle reaches the middle (code 1100) from 60 degrees to 120 degrees in FIG. 6, the power supplied to the motor 32 is stopped. The rotation speed of the motor 32 is reduced by the speed control unit 39 to decelerate the rotation of the motor 32. When the motor 32 rotating in this decelerated state reaches an angle of 120 degrees (code 1011), the start/stop control unit 38 stops the power supply to the motor 32 and at the same time shorts the terminals of the motor 32. This will apply the brakes and bring the vehicle to a sudden stop. At this time, since the motor 32 has already been decelerated, it can be stopped suddenly at a small overshoot angle, and positioning can be performed within the angular range limited by the code 1011, ensuring a stable and accurate amount of gas. If the target position is instructed in the opposite direction while the motor drive unit 31 is operating, the start/stop control unit 3
8 causes the motor 32 to suddenly stop. The motor 32 requires some time to completely stop after the sudden stop signal is sent. As shown in Figure 7, if we estimate from the motor current, it will stop from sudden stop signal sending (T=to) to stop (T='t+
) is the time required for stopping. The timer section 40 is set to a time longer than the time ta, and when inverted, the start/stop control section 38 sends out a stop signal, the timer section 40 delays it for a predetermined period of time, and then the start/stop control section 38 sends out a reversal signal. .

Effects of the Invention As described above, the gas control device of the present invention has the following effects in addition to achieving a high υ ratio while ensuring flow accuracy and reducing power consumption.

(1) Since the reversal signal is sent after a predetermined period of time has elapsed after sending the stop signal during a sudden reversal, excessive current generated in the motor during a sudden reversal is prevented, thereby increasing the durability of the motor.

(2) Since the impact load generated on the reduction gear during reversal can be reduced, the reliability and durability of the reduction gear are increased.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a gas control device according to an embodiment of the present invention, FIG. 2 is a developed view showing the positional relationship between the holes and grooves of the closure, and FIG. 3 is a plan view of the orifice plate. Fig. 4 is a plan view of the same position signal generator, Fig. 5 is an external perspective view of the same closure, Fig. 6 is a pattern diagram of the sliding contact surface of the same age-sol neat type encoder, and Fig. 7 is a stoppage of the same motor. FIG. 8 is a gas circuit diagram of a conventional gas control device, and FIG. 9 is a cross-sectional view showing an example of a conventional gas control device. 17...Cock, 22...Multiple channels, 23...Porous holes, 24...Orifice plate, 28...Position signal generator , 31...
Motor drive unit, 34...Position determination circuit, 35.
・・・・・・rank@banshubu, 36・・・・・・arithmetic control unit,
37... Drive control section, 38... Start/stop control section, 39... Speed control section, 40...
timer. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 5111 Figure 7 One time lock T

Claims (1)

[Claims] A cock that switches to open and close a plurality of flow channels, an orifice plate having porous holes corresponding to the plurality of front and rear flow channels, a motor drive unit that rotationally drives the cock, and a position signal that outputs a signal according to the position of the cock. a generator, a position determination unit that receives this signal and determines the cock position, a calculation control unit that receives the target position signal and the signal from the position determination unit, and a drive unit that receives the signal from the calculation control unit and drives the motor drive unit. A gas control device comprising: a drive control section that sends out a signal; and a timer section that sends out a drive stop signal when the motor drive section is reversed and sends out a reversal signal after a predetermined period of time.