JPH0112040Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas control valve device used in water heaters and other gas appliances.

In a conventional water heater, as shown in FIG. 1, for example, a safety valve c on the upstream side, a main operating valve d on the downstream side, and a main gas passage b are provided in the valve casing a, interposed in the main gas passage b. A control valve device is used which accommodates a pilot valve f interposed in an internal pilot gas passage e branching from an intermediate portion of the main gas passage b, and a hydraulically responsive valve g downstream of the main operation valve d is provided in the main gas passage b. intervening, and supplying gas from the downstream gas outlet h to the main burner i,
Further, a gas reservoir j is provided at the downstream end of the pilot gas passage e, and gas is supplied from the pilot gas outlet k formed in the gas reservoir j to the pilot burner l,
First, the pilot valve f is opened to ignite the pilot burner l, and then the main operation valve d is opened, and then the main burner i is ignited by opening the hydraulic response valve g by using water. shall be.

In this case, the gas reservoir j is created when air flows from the main burner i through the hydraulically responsive valve g between the valve g and the main operating valve d due to the use of water with the main operating valve d closed. When the main operation valve d is opened, the air flows into the valve d.
This prevents the flow from flowing back into the pilot burner l through the pilot valve f and the pilot burner l, thereby helping to prevent misfires of the pilot burner l.
In other words, the gas reservoir j is located at the bottom when the type of gas used is a gas with a higher specific gravity than air such as propane gas, and at the top when the type of gas used is a gas with a specific gravity lower than air such as city gas. According to this, the incoming air accumulates in the upper or lower part of the gas reservoir j due to the difference in specific gravity and does not flow out to the pilot gas outlet k, and therefore flows to the pilot burner l. backflow is prevented. However, in this case, when the pilot gas outlet k is turned upside down to change the gas type, etc., the distance between the outlet k and the pilot burner l changes, so the distance between the outlet k and the pilot burner l changes. It is necessary to replace the gas piping,
This has the disadvantage that the work is troublesome.

The purpose of the present invention is to provide a control valve device that eliminates such inconvenience.
A safety valve 3 on the upstream side and a main operation valve 4 on the downstream side are interposed in the main gas passage 2, and a pilot gas passage 5 is provided in the main gas passage 2. In the one accommodating the valve 6,
A branch chamber 7 communicating with the main gas passage 2 is formed outside the intermediate portion of the main gas passage 2, and the igniter gas passage 5 is branched from the branch chamber 7, and within the branch chamber 7, The main gas passage 2 and the branch chamber 7 are characterized by being provided with a partition 8 that switches the communication position between the main gas passage 2 and the branch chamber 7 to at least one of the upper and lower positions.

As shown in FIG. 2, for example, the valve housing 1 has a main gas passage 2 extending in the horizontal direction with a gap between the front and back, and a safety valve 3, a main operating valve 4, and a main gas passage located between the two valves 3 and 4. A pilot valve 6 is interposed in the pilot gas passage 5 formed in the middle upper side wall of the gas passage 2 as will be described later.
an ignition valve 10 interposed in an ignition gas passage 9 formed by directly branching from the intermediate portion in the intermediate lower side wall;
Furthermore, the main gas passage 2 on the downstream side of the main operation valve 4 is provided with a hydraulically responsive valve 11, and a gas source is provided at the gas inlet 1a at the upstream end of the main gas passage 2.
A main burner A is provided at the main gas outlet 1b at the downstream end of the ignition gas passage 5, a pilot burner B for constant combustion is provided at the ignition gas outlet 1c at the downstream end of the ignition gas passage 5, and an ignition gas outlet 1d at the downstream end of the ignition gas passage 9. The ignition burner C was connected to the ignition burner C.

In the drawing, reference numeral 12 indicates an operating shaft that is slidably inserted into the main operating valve 4 and has its tip facing the safety valve 3;
When the operating shaft 12 is pushed from the stop position, the safety valve 3 is pushed open, and then when the operating shaft 12 is pushed and rotated, the first cam 1 on the lower side of the tip of the operating shaft 12 is opened.
3 opens the ignition valve 10, and the second cam 14 on the upper side of the tip opens the pilot valve 6, and the pilot burner B is ignited via the ignition burner C. The safety valve 3 is held open by the output of the detection element D that detects the flame of the burner B, and then when the pressing force of the operation shaft 12 is released, the shaft 12 is moved back by the return spring 12a.
The first cam 13 is removed from the ignition valve 10, and the ignition valve 1
0 is closed, the ignition burner C is extinguished, and the ignition is completed as shown in FIG. The axis 12 according to the rear inclined plane
is moved back by the return spring 12a, and the main operating valve 4 is opened by being pushed by the flange 17 on the shaft 12 which is in contact with the front surface of the main operating valve 4.

Next, the branching chamber 7, which is a feature of the present device, will be explained.

The branch chamber 7 has a cylindrical surrounding wall 18 protruding from the outer surface of one side of the intermediate side wall of the main gas passage 2 as shown in FIG. The main gas passage 2 and the branch chamber 7 are formed in such a way that the horizontal side wall of the middle part on the side where the branch chamber 7 is provided is about the width of the passage 2 in the vertical direction. They communicate with each other through openings 20 spanning the entire width, and furthermore, a pilot gas passage 5 is formed extending from the upper part of the branch chamber 7 to the upper wall of the intermediate portion, and a pilot valve 6 is interposed therein as described above. A partition 8 is detachably inserted into the branching chamber 7.

The partition body 8 is formed by forming an arc-shaped closing plate portion that closes the opening 20 at the tip of a substantially U-shaped frame portion that comes into contact with the lid body 19 and the upper and lower surfaces of the surrounding wall 18. The main gas passage 2 and branch chamber 7 are located at the bottom of the section.
A through hole 8a that communicates with the branch chamber 7 and the pilot gas passage 5 was formed in the upper part of the frame.

Next, to explain its operation, when using a gas with a higher specific gravity than air, such as propane gas,
A partition body 8 is inserted into the branch chamber 7, and gas flowing from the safety valve 3 into the middle part of the main gas passage 2 passes through the through hole 8a in the lower part of the partition body 8 to the branch chamber 7 and the branch chamber 7.
The gas is made to flow from the gas to the pilot gas passage 5 through the through hole 8b in the upper part of the partition body 8. According to this, when the main operation valve 4 is opened, the air flowing back from the downstream side to the middle part of the main gas passage 2 accumulates in the upper part due to the difference in specific gravity, and the through hole 8a in the lower part is connected to the safety valve 3. Only this gas flows in, and backflow of air into the starter gas passage 5 is reliably prevented.

Further, when using a gas having a specific gravity smaller than that of air, such as city gas, the partition 8 is removed from the branch chamber 7 as shown in FIG. 4. In this case, the air that flows back into the middle part of the main gas passage 2 when the main operation valve 4 is opened accumulates in the lower part due to the difference in specific gravity, and therefore the air flows back into the pilot gas passage 5 that branches from the upper part of the branch chamber 7. is prevented.

Although the embodiment in which the igniter gas passage 5 is branched from the upper part of the branching chamber 7 has been described above, the igniter gas passage 5 may be branched from the lower part of the branching chamber 7, and in this case, the above-mentioned embodiment can be applied. Conversely, a partition 8 is used to communicate the main gas passage 2 and the branch chamber 7 at the upper part, so that when a gas with a specific gravity smaller than air is used, the air that flows back into the main gas passage 2 and accumulates at the bottom of the main gas passage 2 is transferred to the branch chamber. The partition body 8 is removed when using a gas having a higher specific gravity than air to prevent it from flowing back into the pilot gas passage 5 at the lower part of the gas passage through the gas passage 7.

Further, in the above embodiment, the partition body 8 is configured such that the communication between the main gas passage 2 and the branch chamber 7 can be switched from the vertical communication state when the main gas passage 2 and the branch chamber 7 are not inserted to the communication state from either the upper or lower direction when the main gas passage 2 is inserted. However, the present invention is not limited to this, and it is also possible to configure the device with a movable lid 8c, as shown in FIG. 5, for example, in order to freely switch the communication position up and down.

In this way, according to the present invention, the branching chamber 7 branches the pilot gas passage 5 outside the middle part of the main gas passage 2.
The igniter gas passage 5 is branched from the branch chamber 7, and the main gas passage 2 is formed in the branch chamber 7.
By providing the partition plate 8 that switches the communication position between the gas passage and the branch chamber 7 to at least one of the upper and lower parts, no changes can be made to the pilot gas passage 5 simply by attaching and detaching the partition 8 or switching it up and down. It has the effect of being convenient because it can cope with the change of gas type without any hassle, and does not require troublesome work such as replacing gas piping as in the conventional type described above.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of a conventional device, Fig. 2 is a cutaway front view of an example of the device of the present invention, Fig. 3 is a side view taken along the line - - of Fig. 2, and Fig. 4 is with the partition removed. FIG. 5 is a cutaway side view showing another embodiment. 1... Valve housing, 2... Main gas passage, 3... Safety valve, 4... Main operation valve, 5... Pilot gas passage, 6...
...Fire valve, 7... Branch chamber, 8... Partition body.

Claims (1)

[Scope of utility model registration request] Inside the valve casing 1, a main operating valve 4 on the downstream side of the safety valve 3 on the upstream side is interposed in the internal main gas passage 2, and an internal pilot gas passage 5 is interposed in the main gas passage 2, which branches off from the middle part of the main gas passage 2. A branch chamber 7 communicating with the main gas passage 2 is formed outside the intermediate portion of the main gas passage 2, and a branch chamber 7 is connected to the pilot gas passage 5 from the branch chamber 7. A gas control valve characterized in that a partition 8 is provided in the branch chamber 7 to switch the communication position between the main gas passage 2 and the branch chamber 7 to at least one of the upper and lower sides. Device.