JPS59158912A - Combustion controlling for gas - Google Patents

Abstract

PURPOSE:To compact the titled controller by satisfying both the control performance and closing functuon of a proportional control valve and eliminating the need for a closing valve. CONSTITUTION:With a proportional control valve 40, a first valve body 41 controlling fluid pressure and a second valve body 43 closing a fluid path are formed oppositely. A plunger 46 connected to the first valve body 41 and the second valve body 43 is supported in a non-sliding vertically movable manner by two leaf springs 55. An electromagnetic coil 47 and a yoke 48 on the outside of the plunger 46 constitute an electromagnetic driving section. The titled controller is constituted so that gas pressure in a primary pressure chamber 49 works to a diaphragm 51 fixed at the upper end of the plunger 46, and a spring 52 energizes force in the direction that the second valve body 43 is closed. A controller 54 containing a proportional control region limiting circuit (c) and an ignition operating circuit (b) is connected to the electromagnetic coil 47, instantaneous maximum allowable currents are conducted on the starting of combustion of a gas burner 53, and combustion is started positively and quietly even on the adhesion of the valve, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to J1fj'tuniJF's house, and to the place where the waste is sent. 'l)? scum combustion control device (related).

The structure of a conventional example and its highlights are shown in the 11th page of this conventional one-width gas combustion control device 6f. In Fig. 1, 1 is a former cock, 2Q is a solenoid valve, and from the downstream side, it is branched from the pihino 1-r route 3, and by opening the valve 2, the bar 10] t□
Burner 4 or shield fire. 6VJ is closed, and a proportional control force of 6 is applied downstream. Proportional jj'l side] The valve 6 includes a TV seat 7 and an 11 body 8, a die/flamm 9 that works together with the valve body 8, and a market closing bullet 1' that has a force 1 in the valve closing direction. The well-known governor section A, l-, which is composed of 1o,
The plunger 1 is non-slidingly supported on the axis of the yoke 12 and coil 11 by metal plate springs 13 at both ends.
4, and an electromagnetic drive section B consisting of a coil 1 and a coil 1.
015ij burner which controls the gas flow rate according to the amount of electricity supplied to 1, 16 is a heat exchanger, 17 is heat exchanger 1
It is a heat-sensitive element that detects the water temperature, and its signal is compared with the set value in the controller 18, and the deviation is sent to the proportional control valve 6. 19 is a faucet, and 20 is a shower head.It detects the temperature of hot water and controls the amount of combustion according to the temperature, so that hot water at the desired temperature is determined. That's what you get.

The proportional control valve 6 used in this group of gas combustion control devices needs to accurately control the gas flow condition over a wide range of Φ [Σ] from the minimum combustion amount to the maximum combustion amount from the burner side. A closing function is required to completely shut off the gas flow meter to the burner 15. In the former case,
This is sometimes important when controlling the air-fuel ratio, and the latter is important because even if the amount of electricity supplied to the proportional control valve 6 is reduced to zero, gas will leak and the combustion amount will fall below the minimum combustion amount, causing problems such as backfire. be. In order to solve the former problem, electromagnetic drive section B
Care must be taken to ensure that the electromagnetic force generated by the valve body 8 acts faithfully on the valve body 8 without being subjected to disturbances such as sliding friction. It is necessary to select a shape and material that will not lock. The lock here refers to the adhesion between the valve seat 7 and the valve body 8, or the valve body 8 being fitted onto the valve seat 7 side under the force of the closing elastic body 1o, and opening the valve smoothly. A state in which there is no On the other hand, in order to solve the latter problem (ri), a common method is to provide an elastic part at the abutting part between the valve body 8 and the valve seat 7, and to increase the closing force of the closing elastic body 10. However, in this case, since the valve body 8 is held on the valve seat 7 via the elastic member, sticking is likely to occur, and the valve body 8 is locked to the valve seat γ.
Even if the coil 11 is energized, the valve does not open, and the control characteristics deteriorate, especially in a small flow rate range. Figure 2 f/:j:, Please show the situation.
Even if the predetermined coil current 11 (for example, slow ignition current) is fully energized, the predetermined gas flow rate Q1 cannot be obtained.
At an unspecified amount of energization x at which the lock is released, the valve suddenly opens (-1, for example, an explosion and ignition occurs.

If the device is not used for a long period of time, the adhesive strength will further increase and it may become inoperable.

In other words, since it is not possible to solve the former problem and the latter problem at the same time, in the past, it was necessary to provide a closed valve 5 for gas on the downstream side of the proportional control valve 6.
and the cost of gas combustion control equipment.

This is a factor that increases the space.

In addition to the example described in -1-, FIG. 3 shows an example of a proportional control valve with a closing function. 35 is the fluid population, 21 is the fluid output "1
．． 22←4 is a first valve seat, and 23 is a first valve body provided opposite to the first valve seat 22. The first valve seat 22 and the first valve body 2
3, the cross-sectional area of the fluid flow path is varied and the plucking pressure is controlled.
．． Ru. 24 is the first valve seat, and -F of the second valve portion 22
It is installed on the stream side. 25, a second valve body facing the second valve seat 24 and provided integrally with the first valve body 23; 26 elastic bodies are provided on the contact surface side with the second valve seat 24; ing.

- Either the fluid flow path is closed by the second valve seat 24 and the second valve body 26 configured as described in - or the gas pressure acts in a direction to push the second valve body 25 open, and the second valve body 25 is opened. Since the effect is similar to that of reducing the closing force of the spring 27 which is biased in the direction of closing 1F, the problem is that the actual valve closing pressure changes depending on the size of the Amagawa. There is.

Purpose of the Invention (a) The invention solves such conventional problems and satisfies both the control condition and the closing function of the proportional control valve (~, by eliminating the need for a closing valve, gas combustion control is achieved. We will make every effort to reduce the cost and make the equipment more compact.

Structure of the Invention In order to achieve this object, the present invention has a first valve body that controls the fluid 1] and a second valve body that closes the fluid passage from the inlet side to the next chamber, A diaphragm having the same effective pressure-receiving area as the second valve body is fixed to the primary pressure chamber in conjunction with the second valve body, so that the first valve body and the second valve body are driven simultaneously, and as the energization sensitivity increases. A proportional control valve having an electrical drive unit that generates a force that moves the second valve body in the opening direction and the first valve body in the opening direction, and a gas burner are provided, and the proportional control valve is energized. , the ignition operation circuit that applies instantaneous maximum allowable current at the start of combustion in a gas burner, and immediately thereafter applies a certain current within a proportional control region that continuously obtains the maximum combustion gas Ilf from the minimum combustion gas flow rate. and a proportional control circuit that energizes the current within the proportional control region after the ignition.

With this configuration, the second valve body closes the fluid passage, and the ignition operation circuit operates to supply instantaneous maximum allowable current and immediately supply appropriate slow ignition current within the proportional control region when combustion starts in the waste gas burner. However, when the second valve body is opened, it acts to ensure the valve opens even if it is sticky or the like, and also performs gentle ignition and ignition.

Furthermore, after ignition, the control is ensured within the proportional control region.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. In FIG. 4, a proportional control valve 40 and a pilot trace path 3 are branched and provided downstream of the original cock 1 and the original solenoid valve 2,
A pilot burner 4 is provided at the tip of the passage 3. In the proportional control valve 40, a first valve body 41 and a first valve seat 42 that control fluid pressure are opposed to each other, and a second square body 43 and a second valve seat 44 that close a fluid passage are respectively opposed to each other.
It is formed by ~.

In particular, the second valve body 43 is made of an elastic body such as the second valve body 43, and has a yellow back plate 45 on the back side. These first valve bodies 41
and a plunger A 46 connected to the second valve body 43 (non-sliding and vertically movable by a single leaf spring 65 (・τ support arm - C) 11 electromagnetic coils 47, yoke 48, etc., constitute an electromagnetic drive section.-The gas pressure in the secondary pressure chamber 49 is configured to act on a diaphragm 51 fixed to the upper end of the plunger 46, and a spring 52
(d) Apply full force in the direction to close the second valve body 43.5
This is 0idOIJing. An outlet 52 of the proportional control valve 40 is connected to a burner 53 . The electromagnetic coil 47 is electrically connected to a controller 54 including a proportional control region limiting circuit 1 and an ignition operation circuit.

The operation of this embodiment in the configuration of -F will be explained using FIG. When starting combustion in the burner 53 with the main solenoid valve 2 open, the pilot burner 4 is ignited first when the main solenoid valve 2 is opened, and then,
The controller 540 ignition spark passage is activated, and the electromagnetic coil 47 is instantly energized with the maximum allowable current 5.

The magnetic force generated by the maximum allowable current I5 is generated by the spring 52.
The force that biases the second valve body 43 in the closing direction by the leaf spring 55 or the like is much greater than the force that biases the second valve body 43 in the closing direction.
Even if the valve 44 is stuck, the second valve body 43 is surely fully opened. Immediately thereafter, the ignition operating circuit acts to immediately switch the proportional valve current to the slow ignition current I3. Therefore, the burner 63 is quietly and slowly ignited with the gas flow Qm. For slow ignition electrician, the minimum rated combustion gas amount Qr
Proportional valve current I2 and minimum rated combustion gas amount Qr to obtain nax
A certain current within the so-called proportional control range between r1in'5c and the resulting proportional valve current I4 can be chosen, depending on the ignition characteristics of the burner. After ignition, by the action of the proportional control circuit including the proportional control region limiting circuit, 1 ton of burner combustion scum is reduced as necessary within the proportional control region.
It is possible to perform proportional control to increase or decrease the upper limit current value in the proportional control area. When trying to further reduce the amount of combustion gas after the proportional valve current reaches , the proportional valve current acts to immediately become zero2, and conversely increases the amount of combustion gas after reaching the lower limit current value I2. When attempting to do so, the proportional valve current acts to maintain its -it lower limit current value l2((().

Therefore, restricting the gas to the minimum rated combustion gas rate may cause a backfire phenomenon, or the maximum rated combustion gas @
There is no chance of overshooting and damaging the equipment.

In addition, when the second valve body 43 or the second valve seat 44 of the proportional control valve 4o is closed (-), the gas pressure in the second pressure chamber 49 is
3 and diaphragm 51 in opposite directions, and
Since the effective pressure receiving areas of the valve body 43 and the diaphragm 61 are the same, they cancel each other out, and the valve closing force is not affected by the magnitude of the primary pressure, but is a constant force due to the force of the valve 11 bene 52 or plate spring 55. value can be obtained.

The effective pressure receiving area S■ of the first valve body 41 is also the same as the effective pressure receiving area SD of the diaphragm 51 (~), and the electromagnetic force is
J, - crowd y, p1, secondary river sound P2, direction to close the second valve body 43 6 / ``force i of the spring 52 or leaf spring 55 used
Assuming F, the force balance equation is F4P1・S■=P1#Sv+P2・Sv+J where 3
Since v=:Sp, P2-3v=F-f? J increases in proportion to the square of the proportional valve current I, and the gas flow ■○
Since qlrl is proportional to the JF square root of P2 for two days, it can be seen that the waste flow rate oq and the proportional valve current are in an inversely proportional relationship.

Effects of the Invention As described in section 2, the dregs combustion control device of the present invention provides the following effects.

JP-A-59-158912 (4) (1) It has a first valve body that controls the fluid pressure I and a second valve body that closes the fluid passage in the inlet-side pressure chamber, and the effective receiving area Ff is the second valve body. The diaphragm is interlocked with and fixed to the second valve body in the same diaphragm f-subpressure chamber as the valve body, and both valve bodies are opened at the same time, and as the amount of current increases, the second valve body fully opens the first valve. The proportional control valve has an electric drive unit that moves the body in the valve closing direction to generate force, and a controller that is equipped with a gas burner and includes an ignition operation circuit and a proportional control circuit. When gas burner combustion starts, the maximum current is applied momentarily, and the current is immediately switched to the proportional valve current within the proportional control region.
After that, the gas proportional combustion control device operates within the proportional control region, and even if there is a non-adhesive material, combustion can be started reliably and quietly, and it can be closed reliably. .

(Since the dual proportional control valve has a function that satisfies both the surface closing function and the proportional control function, a low-cost, compact scum combustion control device can be created.

(3) - Since the structure is such that the number of people cancels out each other, a stable valve closing pressure can be ensured without being affected by fluctuations in the primary gas pressure, and excellent mine closing and performance can be obtained.

(4) The proportional control area limited circuit ensures the maximum and minimum rated combustion gas chambers, and prevents the amount of combustion gas from being throttled too much and causing backfire or overshooting.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional gas combustion control device, Fig. 2 is a control characteristic diagram of a proportional control valve, Fig. 3 is a sectional view of a conventional proportional control valve, and Fig. 4 is a gas combustion control device of the present invention. FIG. 5 is a block diagram showing one embodiment of the control device, and is a control characteristic diagram of the proportional control valve. 40... Proportional control valve, 41 ・First valve body, 43 ・
2nd valve, body, 49... 7th pressure chamber, 51... diaphragm, 53... gas burner, 54... controller. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5 Ratio joint J valve current f

Claims (2)

[Claims] (1) A first valve body that controls fluid pressure and an inlet 111
The second valve body that closes the primary FF chamber VC fluid passage is
If the diaphragm has the same effective pressure receiving area as the second valve body, then -
・In the next pressure chamber, the second valve body and the second valve body are fixedly fixed so that the first valve body and the second valve body are driven at the same time, and the second valve body is opened as the energization hi increases. An electrical drive unit that generates a force that moves the first valve body in the direction of the valve closing force.
A proportional control valve and a gas bar are provided, and energization to the proportional control valve f is carried out at the start of combustion of the gas burner (the maximum allowable current is applied, and immediately after that, the maximum allowable current is applied from the minimum combustion gas flow rate to the maximum combustion gas flow rate). Gas combustion control comprising: an ignition operating circuit that passes a certain current within a proportional control region to continuously obtain the ignition operation circuit; and a proportional control circuit that passes a current within the proportional control region after ignition. Device. (2) After the proportional control circuit of the controller reaches the upper limit current value of the proportional control region, it further attempts to completely reduce the amount of combustion gas. After reaching the 4th flow rate, when increasing the combustion gas amount by 11 degrees, create a proportional control region limiting circuit that maintains the proportional valve current at the lower limit current value (tτ). Claim 1 Item 4. Father's gas combustion control '1Ilj device.