Gas valve with child lock function

Abstract

The present invention relates to a gas valve with a child lock function, comprising a valve body (1), wherein a rotatable valve core (2) is arranged in the valve body (1), a knob rod (3) for driving the valve core (2) to rotate is passed through the valve body (1), the knob rod (3) is kept in an upward movement tendency by the action of a spring (4), and a side-convex limiting portion (5) is fixed on the knob rod (3); the valve body (1) comprises a valve seat (11) and a valve cover (12) fixed on the valve seat (11); the valve body (1) comprises a first lower limiting boss (1a) on the top surface of the inner hole of the valve seat (11), and after the knob rod (3) is pressed down in the original position, the top surface (1a1) of the first lower limiting boss (1a) blocks the limiting portion (5) to restrict the downward movement of the knob rod (3), so that the ignition switch (6) is not triggered. In this way, when maintenance personnel are performing maintenance, even if someone accidentally presses the knob rod in the original position, the ignition switch will not be triggered, avoiding electric shock.

Description

Technical Field

[0001] The invention relates to a gas temperature control valve, and in particular to a rotation angle limiting structure of the temperature control valve. Background Art

[0002] Some gas ovens have two baking chambers spaced apart from each other, each of which is provided with a fire grate. Generally speaking, the lower fire grate in the lower baking chamber has the possibility of controlling the fire intensity, while the upper fire grate in the upper baking chamber has a certain fire intensity, generally a large fire. In the existing gas valve, when the valve stem is pressed down at the zero-degree position (original state), the ignition switch will be triggered. This will cause the maintenance personnel to cause this situation to occur. When the maintenance personnel are repairing, if someone accidentally touches the push-down knob, the ignition switch will be triggered to ignite. When the ignition switch is ignited, a certain current will be generated, and the maintenance personnel will feel uncomfortable with electric shock. For example, the Chinese utility model patent "Gas Valve Capable of Controlling Two Fire Grates and with a Long-Lasting Flame Function" with patent number ZL201821212627.3 (publication number CN208831808U) discloses such a gas valve that triggers the ignition switch by moving the valve stem down at the zero-degree position (original state). Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a gas valve with a child lock function which has a simple and reasonable structure and will not trigger the ignition switch when the valve stem is pressed down at the zero degree position (original state) in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a gas valve with a child lock function, comprising a valve body, a rotatable valve core is arranged in the valve body, a knob rod for driving the valve core to rotate is passed through the valve body, the knob rod is kept in an upward movement tendency by a spring, and a side convex limit part is fixed on the knob rod; the valve body comprises a valve seat and a valve cover fixed on the valve seat; it is characterized in that: a first lower limit boss is arranged on the upper part of the inner hole of the valve seat, and after the knob rod is pressed down in the original position, the top surface of the first lower limit boss blocks the limit part to restrict the downward movement of the knob rod, so that the ignition switch is not triggered.

[0005] The traditional knob rod angle limiting structure is arranged on the valve cover, that is, a limiting groove is arranged on the inner top surface of the valve cover. When the knob rod is in the original state, the limiting block keeps the tendency of moving upward and being stuck in the limiting groove, which leads to a complex valve cover structure. The valve cover can only be manufactured by die casting. In view of this situation, a second lower limiting boss is also arranged on the upper part of the inner hole of the valve seat. The second lower limiting boss is located on one side of the top surface of the first lower limiting boss. After the knob rod is pressed down in the original position, the side wall of the second lower limiting boss blocks the limiting part to limit the rotation direction of the knob rod. This structure constrains the rotation direction of the knob rod by the second lower limiting boss arranged on the valve seat, and the valve seat itself is made by casting, which does not complicate the manufacture of the valve seat. At the same time, the valve cover structure can be simplified. The valve cover can be directly formed by stamping a plate, and the valve cover molding angle is convenient.

[0006] As a further improvement, the top surface of the inner hole of the valve seat is also provided with a third lower limit boss, and when the knob rod is pressed down in the original position and rotated in one direction to the limit position, the side wall of the third lower limit boss blocks the limit portion. The rotation limit structure of the knob rod is also provided on the valve seat, further simplifying the valve cover structure.

[0007] As a preference, the above-mentioned limiting part is directly fixed on the knob rod. Of course, a limiting plate that can rotate with the knob rod can also be arranged on the knob rod, and the limiting block is arranged on the limiting plate.

[0008] In order to make the gas valve have a fire control gear function, the valve cover has a plurality of recessed gears arranged at intervals along the circumference, and the limit part can be sequentially engaged in the gears during the rotation of the valve stem. The limit part and the recessed gear on the inner top surface of the valve cover form a conflicting fit, and the limit part forms a certain blockage for the limit part during the rotation of the knob rod, which makes the user's operation feel better. In addition, the conflicting fit between the limit part and the gear will cause the valve stem to have a popping indicator sound during the rotation process. The rotation angle of the knob rod can be roughly judged according to the number of times the indicator sound is emitted, and the rotation angle of the knob rod can be controlled more accurately.

[0009] Preferably, the width of the top surface of the first lower limit boss satisfies the following condition: when the knob rod rotates from 0 to 20 degrees, the top surface of the first lower limit boss can block the limit portion. In this way, the knob rod can be rotated to a certain angle to trigger the ignition switch, and after rotating to 20 degrees, the gas is connected.

[0010] Compared with the prior art, the advantages of the present invention are: the structure is provided with a first lower limit boss on the upper part of the inner hole of the valve seat. After the knob rod is pressed down in the original position, the top surface of the first lower limit boss blocks the limit portion to restrict the downward movement of the knob rod, so that the ignition switch is not triggered. In this way, when maintenance personnel are repairing, even if someone accidentally presses the knob rod in the original position, the ignition switch will not be triggered, avoiding electric shock. The childproof lock function is set in the valve seat, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the three-dimensional structure of an embodiment of the present invention without the valve cover;

[0013] Figure 3 Schematic diagram of the three-dimensional structure of the valve seat in an embodiment of the present invention;

[0014] Figure 4 Schematic diagram of the three-dimensional structure of the valve cover in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the accompanying drawings.

[0016] like Figures 1 to 4 Shown is a preferred embodiment of the present invention.

[0017] A gas valve with a child lock function comprises a valve body 1, wherein a rotatable valve core 2 is arranged in the valve body 1, a knob rod 3 for driving the valve core 2 to rotate is passed through the valve body 1, the knob rod 3 is kept in an upward movement tendency by a spring, a side-convex limiting portion 5 is fixed on the knob rod 3; the limiting portion 5 is directly fixed on the knob rod 3.

[0018] The valve body 1 includes a valve seat 11 and a valve cover 12 fixed on the valve seat 11; a first lower limit boss 1a is provided on the upper part of the inner hole of the valve seat 11. After the knob rod 3 is pressed down at the original position, the top surface 1a1 of the first lower limit boss 1a blocks the limit portion 5 to restrict the downward movement of the knob rod 3 so that the ignition switch 6 is not triggered. The width of the top surface 1a1 of the first lower limit boss 1a meets the following conditions: during the process of the knob rod rotating from 0 degrees to 20 degrees, the top surface 1a1 of the first lower limit boss 1a can block the limit portion 5.

[0019] A second lower limit boss 1b is also provided on the top surface of the inner hole of the valve seat 11. The second lower limit boss 1b is located on one side of the top surface 1a1 of the first lower limit boss 1a. After the knob rod 3 is pressed down in the original position, the side wall 1b1 of the second lower limit boss 1b blocks the limit part 5 to limit the rotation direction of the knob rod 3.

[0020] A third lower limit boss 1c is also provided on the upper part of the inner hole of the valve seat 11 . When the knob rod 3 is pressed down at the original position and rotated in one direction to the limit position, the side wall 1c1 of the third lower limit boss 1c blocks the limit portion 5 .

[0021] The valve cover 12 has a plurality of recessed gear positions 121 arranged at intervals along the circumferential direction, and the limiting portion 5 can be sequentially engaged with the gear positions 121 during the process of rotating with the valve stem 3 .

[0022] It should be noted that, in the description of this embodiment, the terms "front, back", "left, right", "up, down", "clockwise, counterclockwise", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A gas valve with a child lock function, comprising a valve body (1), wherein a rotatable valve core (2) is arranged in the valve body (1), a knob rod (3) for driving the valve core (2) to rotate is passed through the valve body (1), the knob rod (3) is kept in an upward movement tendency by a spring, and a side-convex limiting portion (5) is fixed on the knob rod (3); the valve body (1) comprises a valve seat (11) and a valve cover (12) fixed on the valve seat (11); the characteristics are: The top surface of the inner hole of the valve seat (11) is provided with a first lower limit boss (1a), and after the knob rod (3) is pressed down at the original position, the top surface (1a1) of the first lower limit boss (1a) blocks the limit portion (5) to restrict the downward movement of the knob rod (3), so that the ignition switch (4) is not triggered; A second lower limit boss (1b) is also provided on the upper portion of the inner hole of the valve seat (11), and the second lower limit boss (1b) is located on one side of the top surface (1a1) of the first lower limit boss (1a). After the knob rod (3) is pressed down at the original position, the side wall (1b1) of the second lower limit boss (1b) blocks the limit portion (5) to limit the rotation direction of the knob rod (3); A third lower limit boss (1c) is also provided on the upper portion of the inner hole of the valve seat (11); when the knob rod (3) is pressed down at the original position and rotated in one direction to the limit position, the side wall (1c1) of the third lower limit boss (1c) blocks the limit portion (5); The valve cover (12) has a plurality of recessed gear positions (121) arranged at intervals along the circumferential direction, and the limiting portion (5) can be sequentially engaged with the gear positions (121) during the process of rotating with the knob rod (3); The width of the top surface (1a1) of the first lower limit boss (1a) satisfies the following condition: during the process of the knob rod rotating from 0 degrees to 20 degrees, the top surface (1a1) of the first lower limit boss (1a) can block the limit portion (5).

2. The gas valve with child lock function according to claim 1, characterized in that: The limiting portion (5) is directly fixed on the knob rod (3).

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