Gas valve

Abstract

The utility model discloses a gas valve which comprises a valve body, a valve element arranged in the valve body and a valve rod with one end penetrating into the valve body, combined with the valve element and used for operating the valve element, and further comprises a motor with an output shaft; the transmission assembly comprises a worm and a worm gear which are matched with each other, and the motor drives the valve rod to rotate through the transmission assembly; and the sensing element is used for detecting the rotating angle of the valve element so as to control the motor. The transmission assembly of the gas valve comprises the worm and the worm gear which are matched with each other, the motor drives the valve rod to rotate through the transmission assembly, and compared with the prior art in which a gear structure is directly used, the transmission efficiency of the motor is improved.

Description

Technical Field

[0001] The present application relates to the field of gas appliance accessories, and in particular to a gas valve. Background Art

[0002] The gas valve is the core component of the gas stove. It generally includes a valve body, a valve core, a valve stem, a shift fork and a solenoid valve. The valve body is provided with an air inlet channel, an air outlet channel and a valve core cavity therebetween. The valve core is a cone-shaped valve installed in the valve core cavity. One end of the valve stem extends into the valve body and passes through the valve core. When the plug valve needs to be opened, the valve stem pushes the solenoid valve through the shift fork. After opening, the valve core can be driven to rotate to adjust the gas flow in the air outlet channel.

[0003] In order to meet the market demand, a gas valve capable of manually and automatically adjusting the gas output volume by a motor is now available. For example, the document with publication number CN114811151A discloses a gas valve and a control method, including a valve body, a valve core, a valve stem, a motor, a first transmission member, and a second transmission member, wherein a driving gear is installed on the output shaft of the motor, and the second transmission member is a passive gear, and the driving gear is directly meshed with the passive gear. In this structure, the motor directly uses a gear structure to realize the rotation of the valve stem, but further improvement is needed. Utility Model Content

[0004] The utility model provides a gas valve, comprising a valve body, a valve core arranged inside the valve body, and a valve stem with one end penetrating into the valve body and combined with the valve core for operating the valve core. The gas valve also comprises:

[0005] a motor having an output shaft;

[0006] A transmission assembly, comprising a worm and a worm wheel that cooperate with each other, wherein the motor drives the valve stem to rotate via the transmission assembly;

[0007] The sensing element is used to detect the rotation angle of the valve core to control the motor.

[0008] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0009] Optionally, the output shaft extends into the worm and drives the worm to rotate synchronously.

[0010] Optionally, the transmission assembly includes:

[0011] A first transmission member, wherein a linkage handle is provided on the first transmission member;

[0012] The second transmission member is provided with a linkage groove extending around the axis of the valve stem, the linkage handle extends into the linkage groove and interacts with the two ends of the linkage groove for transmission; the first transmission member and the second transmission member are both sleeved on the valve stem, the first transmission member rotates synchronously with the valve stem, and the second transmission member is linked with the worm gear.

[0013] Optionally, a driving gear that rotates synchronously with the worm gear is fixed on the worm gear, and the second transmission member is a passive gear, and the driving gear and the passive gear are linked via a transmission member.

[0014] Optionally, the central angle corresponding to the linkage groove is A1, the rotation stroke of the valve stem is A2, and A1 is greater than A2.

[0015] Optionally, the rotation direction of the valve stem from turning off the fire to turning on the fire is the first direction, and the rotation direction from switching on the valve stem to turning off the fire is the second direction;

[0016] Each transmission member has an initial position, and in the initial position, the linkage groove and the linkage handle have a travel in the circumferential direction of the valve stem to avoid each other and release the valve stem to rotate in the first direction.

[0017] Optionally, the linkage handle is adjacent to one end of the linkage slot, and has a diameter matching the width of the linkage slot.

[0018] Optionally, a magnetic sensing element is fixed on the first transmission member, and the sensing element is a plurality of Hall sensors arranged around the outer circumference of the valve stem to detect the position of the magnetic sensing element.

[0019] Optionally, the gas valve further comprises a packaging box fixed to the valve body;

[0020] The valve stem extends through the packaging box, and the extended portion serves as a manual operating portion;

[0021] The transmission assembly and the driving gear are both located inside the packaging box.

[0022] Optionally, the worm and the worm wheel are mounted on the bottom of the packaging box, and the bottom of the packaging box has a recessed area for avoiding the worm.

[0023] The transmission assembly of the gas valve of the present application includes a worm and a worm wheel that cooperate with each other. The motor drives the valve stem to rotate through the transmission assembly, which improves the transmission efficiency of the motor compared to the prior art that directly uses a gear structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a gas valve according to an embodiment of the present application;

[0025] Figure 2 for Figure 1 A cross-sectional view of the gas valve;

[0026] Figure 3 for Figure 1 Exploded view of the gas valve;

[0027] Figure 4a is a schematic diagram of the structure of a gas valve in one embodiment;

[0028] Figure 4b for Figure 4a The structural diagram of the worm is omitted;

[0029] Figure 5 It is the structural diagram of the motor and the worm;

[0030] Figure 6 is a schematic diagram of the structure of the worm;

[0031] Figure 7 It is a structural schematic diagram of the first transmission member, the second transmission member and the valve stem;

[0032] Figure 8a It is a schematic diagram of the structure of the cooperation between the first transmission member and the second transmission member when the valve stem is the active member;

[0033] Figure 8b It is a structural schematic diagram of the valve stem rotating along the first direction when driven by the motor;

[0034] Figure 8c It is a structural schematic diagram of the valve stem rotating along the first direction when driven by the motor;.

[0035] The reference numerals in the figures are described as follows:

[0036] 100, valve body; 110, valve core cavity; 120, valve stem; 130, packaging box; 131, recessed area; 132, mounting hole; 133, positioning port;

[0037] 200, motor; 210, output shaft;

[0038] 300, transmission assembly; 301, worm; 302, worm wheel; 303, positioning hole; 304, positioning column; 305, driving gear; 310, first transmission member; 311, linkage handle; 320, second transmission member; 321, linkage groove; 330, double gear; 331, first gear; 332, second gear;

[0039] 400, induction element; 410, magnetic induction element;

[0040] 500. Circuit board. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] In this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In this application, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to these products or devices.

[0046] The first and second directions of this application can be referred to Figure 7 The X direction and the Y direction in the figure are opposite to each other, which can also be understood as the rotation direction of the valve stem.

[0047] See also Figure 1 to Figure 3The gas valve of the present application includes a valve body 100, a valve core (not shown in the text) disposed inside the valve body 100, and a valve stem 120 with one end inserted into the valve body 100 and combined with the valve core for operating the valve core. The valve body 100 has an air inlet channel, an air outlet channel, and a valve core cavity 110 therebetween. The air outlet channel and the valve core cavity 110 intersect to form an air outlet. The valve core is rotatably mounted in the valve core cavity 110 and has an air distribution hole disposed corresponding to the air outlet and connected to the air inlet channel. One end of the valve stem 120 extends into the valve body 100 and is combined with the valve core to drive the valve core to rotate, change the overlapping area between the air distribution hole and the air outlet, and adjust the air output.

[0048] In order to realize automatic control of the existing gas valve, the gas valve of the present application also includes a motor 200 fixed on the valve body 100. In the prior art, the motor 200 directly drives the gear structure to realize the rotation of the valve stem 120, but the transmission efficiency of the motor 200 in this structure is low.

[0049] In order to solve the above problems, Figures 3 to 4b As shown, the gas valve of the present application also includes a motor 200, a transmission assembly 300 and a sensing element 400, wherein the motor 200 has an output shaft 210, the transmission assembly 300 includes a worm 301 and a worm wheel 302 that cooperate with each other, the motor 200 drives the valve stem 120 to rotate through the transmission assembly 300, and the sensing element 400 is used to detect the rotation angle of the valve core to control the motor 200.

[0050] The transmission assembly 300 of the gas valve of the present application includes a worm 301 and a worm wheel 302 that cooperate with each other. When the motor 200 is controlled, the motor 200 can drive the valve stem 120 to rotate through the transmission assembly 300, and the worm 301 and the worm wheel 302 have the characteristics of high transmission efficiency. Therefore, compared with the existing technology that directly uses the gear structure, the transmission efficiency of the motor 200 is improved.

[0051] See also Figure 5-6 The output shaft 210 of the motor 200 is a non-circular structure. The end of the worm 301 has a positioning hole 303 adapted to the output shaft 210. The output shaft 210 extends into the positioning hole 303 of the worm 301 and drives the worm 301 to rotate synchronously.

[0052] See also Figure 2 to Figure 4b and Figure 7 In order to enable the motor 200 to smoothly drive the valve stem 120 to rotate, the transmission assembly 300 includes:

[0053] The first transmission member 310 has a linkage handle 311 (see Figure 2 or Figure 7 );

[0054] The second transmission member 320 is provided with a linkage groove 321 extending around the axis of the valve stem 120, and the linkage handle 311 extends into the linkage groove 321 and interacts with the two ends of the linkage groove 321 for transmission; the first transmission member 310 and the second transmission member 320 are both sleeved on the valve stem 120, the first transmission member 310 rotates synchronously with the valve stem 120, and the second transmission member 320 is linked with the worm gear 302. In order to achieve the synchronous rotation of the first transmission member 310 and the valve stem 120, the partial cross section of the valve stem 120 is non-circular, and the specific shape can be set according to the requirements, and this application does not make special requirements. For example, in the figure, the cross section can be D-shaped.

[0055] A driving gear 305 that rotates synchronously with the worm gear 302 is fixed on the worm gear 302 (the two rotate coaxially, and the diameter of the driving gear 305 is smaller than the diameter of the worm gear 302), and the second transmission member 320 is a passive gear, and the driving gear 305 and the passive gear are linked through a transmission member. In this embodiment, the transmission member can be a double gear 330, including a first gear 331 with a smaller diameter and a second gear 332 with a larger diameter, wherein the driving gear 305 is meshed with the second gear 332, and the passive gear is meshed with the first gear 331. When driven by the motor 200, that is, the motor 200 drives the worm 301 to rotate, and at the same time, the worm gear 302 and the driving gear 305, the double gear 330, and the passive gear (i.e., the second transmission member 320) are linked in sequence until the end of the linkage groove 321 drives the linkage handle 311 to rotate (i.e., the valve stem 120 rotates) to a specified position.

[0056] In order to prevent the motor 200 from rotating when the valve stem 120 is manually adjusted, the central angle corresponding to the linkage groove 321 is A1, the rotation stroke of the valve stem 120 is A2, and A1 is greater than A2, that is, the valve stem 120 will not drive the second transmission member 320 during manual adjustment. In this embodiment, the rotation direction of the valve stem 120 from turning off the fire to turning on the fire is the first direction (X direction), and the rotation direction from the switch to turning off the fire is the second direction (Y direction). Each transmission member has an initial position. In the initial position, the linkage groove 321 and the linkage handle 311 have a mutual avoidance in the circumferential direction of the valve stem 120 to release the stroke of the valve stem 120 to rotate in the first direction.

[0057] Specifically, Figure 8a As shown, M1 is the initial position of the first transmission member 310, M2 is the extreme position of the first transmission member 310, and N is the initial position of the second transmission member 320. When the valve stem 120 serves as an active member, it only drives the first transmission member 310 to rotate in the first direction to fire. At this time, the linkage handle 311 rotates relative to the linkage groove 321. Even if it rotates to the extreme amplitude (M2), it does not offset the linkage groove 321, so it will not drive the motor 200, completely eliminating safety hazards.

[0058] like Figure 8b to Figure 8c As shown, when driven by motor 200, it can rotate along the first direction (such as Figure 8b ), at this time, one end of the linkage groove 321 drives the linkage handle 311 to rotate until the valve stem 120 rotates to a specified position. Similarly, the motor 200 can also rotate in the second direction (such as Figure 8c ), at this time, the other end of the linkage groove 321 drives the linkage handle 311 to rotate until the valve stem 120 rotates to a specified position.

[0059] In order to minimize the rotation angle of the motor 200 in the first direction, in the initial position, the linkage handle 311 is adjacent to one end of the linkage slot 321 , and the diameter thereof matches the width of the linkage slot 321 .

[0060] In this embodiment, a magnetic sensing element 410 is fixed on the first transmission member 310, and the sensing element 400 is a plurality of Hall sensors arranged around the outer periphery of the valve stem 120 to detect the position of the magnetic sensing element 410. Preferably, a circuit board 500 is also provided inside the sealing plate, and a plurality of Hall sensors are provided on the circuit board 500. The magnetic sensing element 410 is provided at the edge of the first transmission member 310, and the number of the sensing elements 400 can be set according to the specific gas gear requirements. For example, the gas valve has 5 gears, that is, the gas valve is provided with 5 Hall sensors corresponding to the 5 fire gears. Preferably, the magnetic sensing element 410 is a magnet.

[0061] Furthermore, the gas valve further comprises a packaging box 130 fixed to the valve body 100, the valve stem 120 penetrates and extends out of the packaging box 130, and the extended portion serves as a manual operating portion;

[0062] The transmission assembly 300 and the driving gear 305 are both located inside the packaging box 130. In this embodiment, the motor 200 is located outside the packaging box 130. In order to make the structure more compact, the worm 301 and the worm wheel 302 are installed at the bottom of the packaging box 130. The bottom of the packaging box 130 has a recessed area 131 to avoid the worm 301. Figure 3 and Figure 4b As shown, the recessed area 131 is arranged near the peripheral wall of the packaging box 130, and a mounting hole 132 is opened on the peripheral wall of the packaging box 130. In order to axially fix the worm 301, one end of the worm 301 (the end without the positioning hole 303) has a positioning column 304, and a positioning port 133 is provided in the packaging box 130. The recessed area 131 is located between the mounting hole 132 and the positioning port 133. When installation is required, the worm 301 can be extended into the packaging box 130 from the mounting hole 132 until the positioning column 304 is matched with the positioning port 133, and then the output shaft 210 of the motor 200 is extended into the positioning hole 303, and then the motor 200 housing and the packaging box 130 are fixed with screws.

[0063] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0064] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A gas valve, comprising a valve body, a valve core arranged inside the valve body, and a valve stem having one end inserted into the valve body and combined with the valve core for operating the valve core, characterized in that: The gas valve further comprises: a motor having an output shaft; A transmission assembly, comprising a worm and a worm wheel that cooperate with each other, wherein the motor drives the valve stem to rotate via the transmission assembly; The sensing element is used to detect the rotation angle of the valve core to control the motor.

2. The gas valve according to claim 1, characterized in that: The output shaft extends into the worm and drives the worm to rotate synchronously.

3. The gas valve according to claim 2, characterized in that: The transmission assembly comprises: A first transmission member, wherein a linkage handle is provided on the first transmission member; The second transmission member is provided with a linkage groove extending around the axis of the valve stem, the linkage handle extends into the linkage groove and interacts with the two ends of the linkage groove for transmission; the first transmission member and the second transmission member are both sleeved on the valve stem, the first transmission member rotates synchronously with the valve stem, and the second transmission member is linked with the worm gear.

4. The gas valve according to claim 3, characterized in that: A driving gear which rotates synchronously with the worm wheel is fixed on the worm wheel, and the second transmission member is a passive gear. The driving gear and the passive gear are linked via a transmission member.

5. The gas valve according to claim 3, characterized in that: The central angle corresponding to the linkage groove is A1, the rotation stroke of the valve stem is A2, and A1 is greater than A2.

6. The gas valve according to claim 5, characterized in that: The rotation direction of the valve stem from off to off is the first direction, and the rotation direction from on to off is the second direction; Each transmission member has an initial position, and in the initial position, the linkage groove and the linkage handle have a travel in the circumferential direction of the valve stem to avoid each other and release the valve stem to rotate in the first direction.

7. The gas valve according to claim 3, characterized in that: The linkage handle is adjacent to one end of the linkage slot, and has a diameter matching the width of the linkage slot.

8. The gas valve according to claim 3, characterized in that: A magnetic sensing element is fixed on the first transmission member, and the sensing element is a plurality of Hall sensors arranged around the outer circumference of the valve stem to detect the position of the magnetic sensing element.

9. The gas valve according to claim 4, characterized in that: The gas valve further comprises a packaging box fixed to the valve body; The valve stem extends through the packaging box, and the extended portion serves as a manual operating portion; The transmission assembly and the driving gear are both located inside the packaging box.

10. The gas valve according to claim 9, characterized in that: The worm and the worm wheel are installed on the bottom of the packaging box, and the bottom of the packaging box has a recessed area for avoiding the worm.

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