Safety device for a gas valve
A safety device for a gas valve includes a valve seat, a valve cap, a press bar, an electronic valve, and a thermocouple. The valve cap comprises a passage interconnected with a main gas channel and a gas ignition channel. The passage is formed with a neck. A valve body provided in the gas ignition channel comprises a push bar. The press bar and the electronic valve are disposed at respective sides of the neck. When the press bar is pushed to engage with the neck, an elastic block provided on the electronic valve retreats from the neck and a switch plate provided on the elastic block moves simultaneously to push the push bar of the valve body upward so as to open the gas ignition channel.
1. Field of the Invention
This invention relates to a safety device for a gas valve, in particular an electronic valve secured to one end of a passage in a valve cap to avoid signal from the electronic valve being disrupted.
2. Description of the Related Prior Art
A conventional gas stove has a safety valve to control gas passage by detecting the temperature in case the fire is distinguished. As shown in
To operate the device, as shown in
Upon the temperature of the fire source reaches to a predetermined value, as shown in
In case the fire is extinguished to drop the temperature, a signal is transmitted from the thermocouple B5 to the electromagnetic valve B3 and to extend the retractable block B7 out. The retractable block B7 engages with the valve body A3 again, thus the gas inlet A1 and outlet A2 are in a closed status and the gas supply is terminated, as shown in
However, the electromagnetic valve B3 of the gas safety valve moves up and down in the valve cap B. This movement causes the signal wire B6 to loose after a certain period of time. The other disadvantage is that the press bar B4 of the electromagnetic valve B3 seats direct on the top of the valve cap B, this position is not able to be changed.
SUMMARY OF THE INVENTIONAccording to the invention there is provided a safety device for a gas valve comprising a valve seat, a valve cap, a press bar, an electronic valve, and a thermocouple. The valve seat comprises a main gas channel. The valve cap is secured to the valve seat and comprises a gas ignition channel and a valve body controlling the opening and closing of the gas ignition channel. The press bar is disposed in the valve cap. The electromagnetic valve is secured to the valve cap and comprises an elastic block at one end. The elastic block is controlled by the press bar and the electromagnetic valve to move. The thermocouple is secured to outside of the valve cap and connected with the electromagnetic valve. The valve cap comprises a passage to interconnect with the main gas channel and the gas ignition channel. The passage is formed with a neck. The valve body in the gas ignition channel comprises a push bar extending into the passage. The press bar moving along the passage has one end to engage with the neck. The electromagnetic valve is secured to another end of the passage. The elastic block of the electromagnetic valve is to engage with or retreat from the neck. The movement of the elastic block links the push bar of the valve body to control the opening and the closing of the gas ignition channel.
The elastic block of the electromagnetic valve comprises a switch plate in an undulate shape. The switch plate is to contact with the push bar of the valve body.
The press bar is transversely disposed in the valve cap, and the valve seat and said valve cap are formed with threaded holes around circumferential edges to receive fasteners therein for secure purpose. The valve cap may be swung to change its position in relation to the valve seat to change the position of the press bar.
The present invention has the following advantages:
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- 1. The electromagnetic valve is secured to the passage of the valve cap, so the electromagnetic valve is in a fixed status. When the press bar is pressed, the electromagnetic valve will not move, so that the electromagnetic valve and thermocouple can maintain a stable and steady status.
- 2. There is no signal wire between the electromagnetic valve and the thermocouple, thus no wire will be torn or pulled to loose.
- 3. The press bar is transversally disposed in the passage of the valve cap. The position of the valve cap can be changed in relation to the valve seat, so that the press bar can be changed in four different ways. It is easy to install the present invention.
As shown in
The valve seat 1 comprises threaded holes 11 around the circumferential edges and a main gas channel. The main gas channel includes a gas sub-channel inlet 12, a gas sub-channel outlet 13, a first channel 14 and a second channel 15.
The valve cap 2 is secured to the valve seat 1 and comprises threaded holes 21 around the circumferential edges for fasteners 22 to insert therein. The valve cap 2 further comprises a passage 23 interconnected with the first channel 14 and the second channel 15 of the valve seat 1. The passage 23 is formed with a neck 24 at the center section. One end of the passage 23 is provided with a stop edge 25 at a proper position. The top of the passage 23 is provided with a chamber 26 interconnected with a gas ignition channel. The gas ignition channel includes a gas ignition inlet 27 and a gas ignition outlet 28. The chamber 26 is provided with a valve body 29 to connect or to block the gas ignition channel. The valve body 29 comprises a push bar 291 extending towards the passage 23.
The press bar 3 is transversally disposed at one side of the neck 24 in the passage 23 of the valve cap 2. The press bar 3 comprises a first spring 31 and a second spring 32 urging the press bar 3 to engage with the stop edge 25 and the neck 24 of the passage 23. The front end of the press bar 3 is provided with a washer 33 to engage with or retreat from the neck 24. The washer 33 is urged by the second spring 32 to seal the neck 24 when the washer 33 engages with the neck 24.
The electromagnetic valve 4 is secured to the other side of the neck 24 in the passage 23. One end of the electromagnetic valve 4 is provided with an elastic block 41 to seal the other side of the neck 24. A switch plate 42 is provided on the elastic block 41. The switch plate 42 is in an undulate shape. The switch plate 42 comprises a switch section 43 protruding from the switch plate 42 to push the push bar 291 of the valve body 29.
The thermocouple 5 is connected with a temperature sensor to the fire source. The thermocouple 5 is disposed outside one side of the passage 23 and connected with the electromagnetic valve 4 directly to control the movement of the electromagnetic valve 4.
To practice the present invention, as shown in
When the fire source is extinguished suddenly to drop the temperature of the fire source, the thermocouple 5 will send a signal to the electromagnetic valve 4 to stop sucking the elastic block 41. The elastic block 41 is released to engage with the neck 24 (as shown in
Claims
1. A safety device for a gas valve comprising:
- a valve seat, said valve seat comprising a main gas channel;
- a valve cap secured to said valve seat, said valve cap comprising a gas ignition channel and a valve body controlling the opening and closing of said gas ignition channel;
- a press bar disposed in said valve cap;
- an electromagnetic valve, said electromagnetic valve comprising an elastic block at one end, said elastic block being controlled by said press bar and said electromagnetic valve to move;
- a thermocouple, said thermocouple being secured to outside of said valve cap and connected with said electromagnetic valve, and characterized in that:
- said valve cap comprising a passage to interconnect with said main gas channel and said gas ignition channel, said passage being formed with a neck, said valve body in said gas ignition channel comprising a push bar extending into said passage, said press bar in said passage having one end to engage with or retreat form said neck, said electromagnetic valve being secured to another end of said passage, said elastic block of said electromagnetic valve being to engage with or retreat from said neck, wherein the movement of said elastic block links said push bar of said valve body to control the opening and closing of said gas ignition channel.
2. The safety device for a gas valve, as recited in claim 1, wherein said elastic block of said electromagnetic valve comprises a switch plate in an undulate shape, said switch plate contacting with said push bar of said valve body.
3. The safety device for a gas valve, as recited in claim 1, wherein said press bar is transversely disposed in said valve cap, and said valve seat and said valve cap are formed with threaded holes around circumferential edges to receive fasteners therein for secure purpose, said valve cap may be swung to change its position in relation to said valve seat to change the position of said press bar.
Type: Application
Filed: Jul 12, 2005
Publication Date: Jan 18, 2007
Inventor: Hsu-Nan Liu (Taipei City)
Application Number: 11/178,356
International Classification: F23D 14/72 (20060101);