CN107477215B

CN107477215B - Gas valve

Info

Publication number: CN107477215B
Application number: CN201710894307.4A
Authority: CN
Inventors: 孙飞; 张炳卫; 林海龙
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2023-07-28
Anticipated expiration: 2037-09-28
Also published as: CN107477215A

Abstract

The invention discloses a gas valve, which comprises a valve body (1) and a hollow valve core (2), wherein the valve core is pivotally arranged in a valve cavity (12) of the valve body, the valve cavity comprises a valve cavity bottom wall (13) provided with a valve cavity air inlet (131), the valve core comprises a valve core bottom wall (21) provided with a valve core air inlet (211), and the valve core bottom wall is laminated above the valve cavity bottom wall and can rotate relative to the valve cavity bottom wall so as to adjust the valve cavity air inlet through the change of an overlapped opening area (3) of the valve cavity air inlet and the valve core air inlet. In the gas valve, the valve cavity air inlet of the gas valve can be adjusted by rotating the valve core to form a rotary matched air inlet opening adjusting structure between the valve core air inlet and the valve cavity air inlet. In addition, the gas valve also has the function of adjusting the same size of each ring fire, the synchronous adjustment angle range is wide enough, and the design is more humanized.

Description

Gas valve

Technical Field

The invention relates to the field of household kitchen appliances, in particular to a gas valve.

Background

In household gas stoves, a gas valve is generally adopted to control the cut-off, the opening and the gas quantity in a pipeline, and the gas valve has good control characteristics and closing sealing performance, so that the safe use of the gas stove is ensured.

The conventional gas valve mainly has 3 gears, which are respectively and sequentially positioned at 0 degree, 90 degree and 180 degree in the anticlockwise direction (along the ignition rotating direction), and the size of flame is controlled by adjusting the corresponding gears. Wherein the 0 degree position is the closing position of the gas valve, namely the starting position; the 90 DEG position is the maximum fire position; the 180 position is the state of minimum fire. In addition, when the rotary gas valve rotates from the 90 DEG position to the 0 DEG or 180 DEG position in sequence, the fire gradually decreases, and when the rotary gas valve rotates 180 DEG, the outer ring fire is closed and the inner ring fire is in the minimum state. In the gas valve in the prior art, in the rotating process of the valve core, the gas flow of the gas inlet cannot be well controlled, so that the change of all ring fires is uneven, the gear is less, a user can hardly adjust the desired fire, the user needs to bend down to check, and the user experience is poor.

In particular, for the gas valve with a plurality of nozzles, in order to control the gas quantity flowing into each nozzle, a gas distribution flow passage and an intermediate chamber are required to be arranged in the valve body, so that the valve body is more complex and larger in structure, and the matching structure between the valve core and the inner wall of the valve cavity is complex, so that the gas valve is higher in processing and manufacturing cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a gas valve which is simpler and more compact in structure, and can effectively adjust the air inflow entering a valve cavity and adjust the same size of each ring fire.

In order to achieve the above object, the present invention provides a gas valve, including a valve body and a hollow valve core, the valve core is pivotally disposed in a valve cavity of the valve body, the valve cavity includes a valve cavity bottom wall provided with a valve cavity air inlet, the valve core includes a valve core bottom wall provided with a valve core air inlet, the valve core bottom wall is stacked above the valve cavity bottom wall and can rotate relative to the valve cavity bottom wall, so as to adjust valve cavity air inlet through the change of the overlapping opening area of the valve cavity air inlet and the valve core air inlet.

Preferably, during the entire rotation of the spool in the sparking rotation direction, the overlapping opening area between the spool intake port and the valve cavity intake port gradually increases from zero and then gradually decreases to zero.

Preferably, the valve cavity air inlet is a rectangular opening extending along the radial direction, the valve core air inlet is a fan-shaped annular opening comprising an inner circular arc line and an outer circular line which are radially spaced, the inner circular arc line is a concentric circular arc section concentric with the valve core, the outer circular line comprises a starting gradual change line segment and a closing gradual change line segment, the starting gradual change line segment extends outwards along the radial direction from the circumferential starting end of the valve core air inlet, and the closing gradual change line segment extends inwards along the radial direction from the tail end of the starting gradual change line segment towards the circumferential tail end of the valve core air inlet and gradually approaches the inner circular arc line along the radial direction.

Preferably, the initial gradual change line segment is a straight line segment, and the close gradual change line segment is an arc segment.

Preferably, the radial length of the valve cavity air inlet is greater than the maximum radial length of the valve core air inlet; the overlapping opening area is larger than zero, the radial inner side edge of the valve cavity air inlet is tangent to the inner circular arc line or at least part of the radial inner side edge is positioned on the radial inner side of the inner circular arc line, and at least part of the radial outer side edge of the valve cavity air inlet is positioned on the radial outer side of the outer circular line.

Preferably, the central angle range of the initial gradual change line segment is 30-60 degrees, and the central angle range of the close gradual change line segment is 120-180 degrees.

Preferably, the gas valve comprises a valve rod which is arranged at the top of the valve body and drives the valve core to rotate, and an elastic pre-pressing piece is arranged between the bottom end of the valve rod and the top end of the valve core and is used for keeping the bottom wall of the valve core to be elastically pressed against the bottom wall of the valve cavity.

Preferably, a circumferential sealing ring is arranged between the inner circumferential wall of the bottom end of the valve cavity and the outer circumferential wall of the bottom end of the valve core.

Preferably, the valve body is provided with a total air inlet and an air inlet cavity positioned below the bottom wall of the valve cavity, and the total air inlet, the air inlet cavity and the valve cavity air inlet are sequentially communicated.

Preferably, the gas valve comprises a plurality of nozzles, the valve body is provided with flow passages which are respectively communicated with the nozzles from the valve cavity, the peripheral wall of the valve core is provided with a plurality of grooves which are respectively communicated with the hollow cavity of the valve core and are axially spaced, and the grooves are in one-to-one correspondence with corresponding air ports of the flow passages on the inner peripheral wall of the valve cavity so as to supply air to the nozzles.

Preferably, the nozzle comprises an inner ring nozzle, an intermediate ring nozzle and an outer ring nozzle, the grooves comprise an inner ring groove, an intermediate ring groove and an outer ring groove, the flow channels comprise an inner ring flow channel, an intermediate ring flow channel and an outer ring flow channel, and an inner ring air port, an intermediate ring air port and an outer ring air port are respectively formed in the inner peripheral wall of the valve cavity.

Preferably, the inner ring groove, the middle ring groove and the outer ring groove are all incomplete ring grooves, so that the grooves and the corresponding air ports can be controlled to be conducted or cut off through rotation of the valve core.

Preferably, the valve core rotates from the closed position to the firing position, the maximum firing position and the minimum firing position in sequence along the firing rotation direction;

when the ignition position is rotated to the maximum fire position, the overlapped opening area is gradually increased from zero to the maximum area value, and the inner ring groove, the middle ring groove and the outer ring groove are respectively communicated with the inner ring air port, the middle ring air port and the outer ring air port; and

when the inner ring groove, the middle ring groove and the outer ring groove are kept to be communicated with the inner ring air port, the middle ring air port and the outer ring air port respectively.

Preferably, the outer ring fire closing position is arranged at intervals behind the minimum fire position along the ignition rotating direction, when the outer ring fire closing position is rotated from the minimum fire position, the overlapped opening area gradually decreases from the first set area value to the second set area value, the inner ring groove and the middle ring groove are kept to be communicated with the inner ring air port and the middle ring air port respectively, and the outer ring groove is staggered with the outer ring air port.

Preferably, the outer ring fire-closing device further comprises a rotation limit position arranged at intervals after the outer ring fire-closing position along the fire-striking rotation direction, when the outer ring fire-closing position rotates to the rotation limit position, the overlapped opening area gradually decreases to a minimum area value from the second set area value, the inner ring groove is communicated with the inner ring air port, the outer ring groove is staggered with the outer ring air port in position, and the middle ring groove is staggered with the middle ring air port in position.

In the gas valve, a rotary matched gas inlet opening adjusting structure is formed between the valve core and the valve core gas inlet at the bottom of the valve cavity and the valve cavity gas inlet, so that the total gas inflow of the gas valve can be adjusted, the complex flow channel design of the valve core and the valve body is simplified, the matched structure design of the valve core and the valve body can be simplified, and gas can be directly distributed into the flow channels communicated with all the nozzles through the hollow cavities of the valve core, so that the whole structure of the gas valve is simpler and more compact, and the manufacturing cost is lower.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

FIG. 1 is a perspective view of a valve cartridge according to a preferred embodiment of the present invention;

FIG. 2 is a bottom view of a valve cartridge according to a preferred embodiment of the present invention, showing the shape of the valve cartridge intake port;

FIG. 3 is a bottom view of a valve cartridge according to another preferred embodiment of the present invention, showing the shape of the valve cartridge intake port;

FIG. 4 is a top view of the valve body of the gas valve according to the preferred embodiment of the present invention, showing the structure inside the valve cavity;

FIG. 5 is a schematic view of the structure of the valve body of the gas valve according to the preferred embodiment of the present invention, showing the positions of the valve stem and the total intake port;

FIG. 6 is a schematic structural view of a gas valve according to a preferred embodiment of the present invention, the gas valve including 3 nozzles;

FIG. 7 is a perspective view of the valve cartridge;

FIG. 8 is a front view of the valve cartridge;

FIG. 9 is a front view of the valve cartridge;

FIG. 10 is a cross-sectional view of a gas valve according to a preferred embodiment of the present invention;

FIG. 11 is a cross-sectional view of a gas valve according to a preferred embodiment of the present invention;

fig. 12a to 12e are cross-sectional views (along the bottom wall of the spool) of the gas valve according to the preferred embodiment of the present invention, showing the respective overlapping opening areas when the spool is rotated 0 °,90 °, 200 °, 220 ° and 235 ° in turn in the counterclockwise direction;

fig. 13a to 13E are partial enlarged views of respective states of the portions a to E of fig. 12a to 12E, respectively;

FIG. 14 is a schematic plan view of the valve cartridge deployed along an axis;

fig. 15 is a schematic plan view of the valve chamber, which is developed along the axis, and mainly shows the positional relationship of each port in the valve chamber.

Description of the reference numerals

1. Valve core of valve body 2

3. Overlap open area 4 valve stem

5. Elastic pre-pressing piece 6 circumferential sealing ring

7. Nozzle 12 valve cavity

13. Valve cavity bottom wall 14 total air inlet

21. Valve core bottom wall 22 groove

23. Valve core hollow cavity

25. Inner ring nozzle of valve core body 71

72. Middle ring nozzle 73 outer ring nozzle

131. Valve cavity air inlet 211 valve core air inlet

212. Inner circular arc 213 outer circular line

214. The initial fade segment 215 closes the fade segment

161. The inner ring port 162 is an annular port

163. Outer ring air port

221. Annular groove in inner annular groove 222

223. Outer ring groove

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the positional relationship of the various components with respect to one another in the vertical, vertical or gravitational directions.

For the problems of complex intake air flow regulating structure of the gas valve and the like, the invention provides a valve core, as shown in fig. 1, the valve core 2 comprises a valve core body 25, the valve core body 25 is provided with a valve core hollow cavity 23, the valve core 2 further comprises a valve core intake air regulating piece arranged at the bottom of the valve core body 25, and the valve core intake air regulating piece is used for regulating the intake air flow of the valve core hollow cavity 23 so as to realize the total intake air amount regulation of the gas valve.

By additionally arranging the valve core air inlet regulating piece, the air quantity of the fuel gas entering the valve core hollow cavity 23 can be controlled, so that when the valve core is applied to a fuel gas valve, the total air inflow of the fuel gas valve can be regulated, and the existing distribution flow channel structure of a conventional valve body can be simplified.

Wherein, the structure and the form of the valve core air inlet adjusting piece can be various. For example, the spool intake air adjusting piece may be a shutter for closing or opening the bottom opening of the spool hollow chamber 23, or the spool intake air adjusting piece may be provided with a spool intake port 211 and a shutter for closing or opening the spool intake port 211, so that the opening degree of the spool intake port 211 may be adjusted by the shutter to adjust the intake air flow rate into the spool hollow chamber 23.

However, in order to make the structure compact and small, in the spool 2 of a particularly preferred embodiment of the present invention, as shown in fig. 1 and 2, the spool body 25 includes a spool bottom wall 21 as a spool intake regulating piece, and the spool bottom wall 21 is provided with a spool intake port 211. The valve core air inlet 211 is formed by rotating the valve core 2 to form a rotating opening, and accordingly, a fixed opening (for example, the valve cavity air inlet 131 in fig. 4) may be separately provided, and the total air intake amount of the gas valve is adjusted by the size of the overlapping portion of the rotating opening and the fixed opening (that is, the overlapping opening area 3 shown in fig. 13b to 13 e), which will be described in detail below.

Preferably, the valve core bottom wall 21 and the valve core body 25 are integrally formed, which is convenient for processing and manufacturing.

In a preferred embodiment of the valve core air inlet 211, as shown in fig. 2, the valve core air inlet 211 is in a substantially fan-ring shape and includes an inner circular arc 212 and an outer circular arc 213 spaced radially, the inner circular arc 212 is a concentric circular arc section concentric with the valve core 2, the outer circular arc 213 includes a start gradual change line segment 214 and a close gradual change line segment 215, the start gradual change line segment 214 extends radially outward from a circumferential start end of the valve core air inlet 211, and the close gradual change line segment 215 extends radially inward from an end of the start gradual change line segment 214 toward a circumferential end of the valve core air inlet 211 and gradually approaches the inner circular arc 212 in a radial direction.

When the valve core 2 rotates in the gas valve, gas enters from the valve core air inlet 211 located at the initial gradual change line segment 214, the initial gradual change line segment 214 gradually extends radially outwards, so that the distance between the inner arc line 212 and the outer annular line 213 is wider and wider, the overlapping opening area 3 of the valve core air inlet 211 and the valve cavity air inlet 131 is gradually increased, and the gas entering amount is relatively larger and larger. When continuing to rotate along the converging gradual change line segment 215, the converging gradual change line segment 215 gradually approaches radially inwards to the outer annular line 213, so that the coincident opening area 3 of the valve cavity air inlet 131 and the valve core air inlet 21 is gradually reduced, the gas inlet amount is relatively reduced, and the gas inlet amount entering the valve core hollow cavity 23 can be controlled.

Meanwhile, since the initial gradual change line segment 214 and the close gradual change line segment 215 gradually extend or approach linearly relative to the inner circular arc line 212, the air inflow of the fuel gas can be linearly increased or decreased, so that the fuel gas valve is linearly changed from an ignition state to a maximum fire, then gradually becomes smaller from the maximum fire state, and finally no fuel gas enters and the flame is extinguished.

Preferably, the initial fade segment 214 is a straight segment and the converging fade segment 215 is an arcuate segment to achieve better linear fade adjustment of the fire.

Further, the central angle range of the initial gradual change line segment 214 is preferably 30-60 degrees, and the angle is the preferred air inlet angle range before the maximum fire position of the gas valve; the central angle of the converging graded segment 215 is preferably in the range of 120 deg. to 180 deg., which is an adjustable range of rotation from a maximum fire position to a minimum fire position.

In another preferred form of the spool inlet port 211, as shown in fig. 3, the spool inlet port 211 may be a radially extending rectangular opening. I.e. the shape of the valve cavity air inlet 131 and the valve core air inlet 21 are interchanged.

On this basis, in the valve body 2 of the present invention, as shown in fig. 1, a plurality of grooves 22 are provided on the outer peripheral wall of the valve body 2, and the plurality of grooves 22 communicate with the valve body hollow cavities 23, respectively, and are axially spaced apart from each other so as to correspond to different pluralities of fuel gas flow passages. After the fuel gas enters the valve core hollow cavity 23 from the valve core 2 with the function of adjusting the air inflow, the fuel gas can directly flow from each groove 22 to each nozzle 7, so that the function of synchronous gradual change adjustment of the fire behavior of each flow passage can be met, and the valve core and valve body structures are simplified.

Preferably, the grooves 22 are incomplete ring grooves, and through holes for communicating with the hollow cavities 23 of the valve core are formed in the grooves 22, so that the on-off control of the flow channels corresponding to the grooves 22 can be controlled by the rotation of the valve core 2, which will be described in detail below.

Also, the present invention provides a valve body of a gas valve, as shown in fig. 4 and 5, the gas valve includes a valve body 1 having a valve cavity 12, the valve body 1 being provided with a total gas inlet 14 and a valve cavity gas inlet adjusting structure for adjusting the flow rate of gas entering the valve cavity 12 from the total gas inlet 14.

By adding the valve cavity air inlet adjusting structure to adjust the gas flow introduced into the valve cavity 12, the complicated gas distribution flow channels and the like are not required to be designed to adjust the flow distribution and the size of each gas flow channel, and the structure of the gas valve is simplified.

Typically, the valve body 1 is provided with an inlet chamber below the valve chamber 12, and the total inlet 14 communicates with the inlet chamber, so that a valve chamber inlet adjustment structure may be provided between the valve chamber 12 and the inlet chamber.

In the gas valve of the present invention, as shown in fig. 4, in which the total intake port 14 of the gas valve is generally provided near the side wall of the bottom of the valve body 2, the valve body 1 includes a valve cavity bottom wall 13 as a valve cavity intake adjusting structure, and the valve cavity bottom wall 13 is provided with a valve cavity intake port 131 so that, after the gas is taken in from the total intake port 14, the gas taken in from the valve cavity 12 is timely adjusted by adjusting the relative intake of the valve cavity intake port 131 from the valve cavity bottom wall 13.

Preferably, the valve cavity bottom wall 13 is integrally formed with the valve body 1, and is convenient to manufacture.

The structure and shape of the valve cavity air inlet 131 can take various forms. As previously described, in a preferred embodiment, the valve chamber inlet 131, which is a fixed opening, may preferably be a radially extending rectangular opening to match the rotational opening of the valve spool to adjust the flow of inlet air into the valve chamber 12 by varying the area of the overlapping openings.

The valve cavity air inlet 131 may be a through hole, or may be densely distributed fine holes in the valve cavity air inlet area on the valve cavity bottom wall 13.

In another preferred embodiment, the valve chamber bottom wall 13 may be provided with a shutter for closing or opening the valve chamber air inlet 131. Alternatively, the valve cavity air intake adjustment structure is a gate valve mechanism for closing or opening the bottom opening of the valve cavity 12. The opening of the valve chamber air inlet 131 is adjusted by a shutter to adjust the flow rate of the intake air into the valve chamber 12.

As shown in fig. 6, the gas valve includes a plurality of nozzles 7, and the valve body 1 is provided with flow passages respectively communicating from the valve chamber 12 to the respective nozzles 7, the plurality of flow passages being formed with corresponding gas ports on an inner peripheral wall of the valve chamber 12 to supply gas to the respective nozzles 7. Because the gas valve is additionally provided with the valve cavity gas inlet adjusting structure, the structure of the valve body 1 and the valve core 2 can be simplified, an intermediate distribution cavity, a transition runner and the like are not needed, and the gas can be directly distributed to each nozzle of each runner.

On the basis, aiming at the problems that the gas valve in the prior art is complex in structure, has narrow bandwidth for adjusting fire, and does not realize synchronous adjustment of three rings of fire of inner, middle and outer rings of fire, so that the fire is difficult to master, and the fire needs to be bent to be watched to adjust the wanted fire, and the like, the invention provides a novel gas valve. Referring to fig. 4 to 7, the gas valve includes a valve body 1 and a hollow valve core 2, the valve core 2 is pivotably provided in a valve cavity 12 of the valve body 1, the valve cavity 12 includes a valve cavity bottom wall 13 provided with a valve cavity air inlet 131, the valve core 2 includes a valve core bottom wall 21 provided with a valve core air inlet 211, the valve core bottom wall 21 is laminated above the valve cavity bottom wall 13 and rotatable relative to the valve cavity bottom wall 13 to adjust the valve cavity 12 air intake by a variation in an overlapping opening area 3 (see fig. 12a to 12 e) of the valve cavity air inlet 131 and the valve core air inlet 211.

Therefore, in the gas valve of the present invention, by rotating the spool 2, a rotationally-fitted intake opening degree (overlapping opening area 3) adjusting structure is formed between the spool intake port 211 and the valve cavity intake port 131 to adjust intake of the valve cavity 12 of the gas valve.

Conventionally, a gas valve is required to achieve ignition from intake combustion to maximum fire and then to transition to minimum fire. Therefore, according to the requirement for intake air amount adjustment, it is preferable that the overlap opening area 3 between the spool intake port 211 and the valve cavity intake port 131 gradually increases from zero and then gradually decreases to zero during the entire rotation of the spool 2 in the ignition rotation direction. Meanwhile, the overlapping opening area 3 is preferably linearly and gradually changed, so that a user can more easily control the fire intensity of the gas valve.

In order to enable the above-mentioned overlapping opening area 3 to change linearly (gradually increasing from zero to gradually decreasing from zero) during the entire rotation of the valve spool 2 in the sparking rotation direction, there should be a certain design matching requirement between the structures and shapes of the corresponding valve spool air inlet port 211 and the valve cavity air inlet port 131, and various forms are possible. For example, one preferred embodiment of the valve cavity air inlet 131 and the valve core air inlet 211 that cooperate with each other is: the valve cavity air inlet 131 (see fig. 4) is a radially extending rectangular opening and the valve core air inlet 211 (see fig. 2) is a fanned annular opening comprising radially spaced inner circular arcs 212 and outer annular lines 213.

Further, for the rotational fit relationship between the valve cavity air inlet 131 and the spool air inlet 211, the radial length of the valve cavity air inlet 131 is greater than the maximum radial length of the spool air inlet 211, the overlapping opening area 3 is greater than zero, the radially inner side edge of the valve cavity air inlet 131 is tangential to the inner circular arc 212 or at least a portion of the radially inner side edge is located radially inward of the inner circular arc 212, and at least a portion of the radially outer side edge of the valve cavity air inlet 131 is located radially outward of the outer annular line 213. This allows the overlapping opening area 3 to be varied according to the variation of the radial width of the outer ring line 213 while the inner arc line 212 of the spool inlet port 211 and the valve cavity inlet port 131 remain unchanged during rotation of the spool 2, so as to satisfy the linear variation of the inlet flow rate of the gas valve of the present invention.

Of course, in order to satisfy the linear change of the overlapping opening area 3 (gradually increasing from zero to zero) the structural forms of the corresponding valve cavity air inlet 131 and valve core air inlet 211 are not limited to the above-described shapes, and the valve cavity air inlet 131 and valve core air inlet 211 may be a structure in which fine holes are densely distributed. When the valve body rotates, the overlapping opening area 3 is controlled to linearly change according to the alignment area of the mutually matched dense pores. In addition, the structural shapes of the valve cavity air inlet 131 and the spool air inlet 211 may also be interchanged, for example, the spool air inlet 211 is a rectangular opening extending in the radial direction, and the valve cavity air inlet 131 is a substantially sector-annular opening.

According to the operation habit of a user, normally, when the valve core 2 rotates, 0 DEG is a closing position, 90 DEG is a maximum fire position, a process from no fuel gas to gradually enter the fuel gas and then to the maximum fuel gas is realized between 0 DEG and 90 DEG, and a process from the maximum fire to the minimum fire is realized between 90 DEG and 180 DEG. Thus, in the gas valve of the present invention, the central angle range of the initial gradual change line segment 214 is preferably 30 ° to 60 °, so as to conform to the usual operation of the user; the central angle range of the gradually-changed line segment 215 is preferably 120-180 degrees, so that the process from the maximum fire to the minimum fire is longer, the bandwidth of fire adjustment is increased, the requirement of users on accurate fire adjustment is met, the design is more humanized, and the operation is convenient. Therefore, the user can easily find the required fire intensity without bending down to watch the fire intensity, and the user experience is better.

As shown in fig. 10 and 11, the gas valve comprises a valve stem 4 mounted on the top of a valve body 1 and driving a valve core 2 to rotate, and an elastic pre-pressing member 5 is arranged between the bottom end of the valve stem and the top end of the valve core 2, wherein the elastic pre-pressing member is arranged to keep the valve core bottom wall 21 elastically pressed against the valve cavity bottom wall 13, so that a gap is avoided between the two bottom walls, and gas is caused to enter the valve cavity in a gas leakage mode through the gap (instead of through an overlapped opening area 3).

Further, in order to prevent the leakage of the valve chamber air inlet 131 from directly entering the valve chamber without overlapping the opening area 3, a circumferential seal ring 6 is provided between the bottom end inner peripheral wall of the valve chamber 12 and the bottom end outer peripheral wall of the valve spool 2.

Referring to fig. 5, the valve body 1 is provided with a total air intake 14 and an air intake chamber (not shown) below the valve chamber bottom wall 13, and the total air intake 14, the air intake chamber and the valve chamber air intake 131 are communicated in this order.

Similarly, the gas valve comprises a plurality of nozzles 7, the valve body 1 is provided with flow passages respectively communicated with the nozzles 7 from the valve cavity 12, the outer peripheral wall of the valve core 2 is provided with a plurality of grooves 22 respectively communicated with a valve core hollow cavity 23 and axially spaced from each other, and the grooves 22 are in one-to-one correspondence with corresponding air ports of the flow passages on the inner peripheral wall of the valve cavity 12 so as to supply air to the nozzles 7.

The gas valve may be a double nozzle or a triple nozzle form as shown in fig. 6 to 9, that is, the nozzle 7 includes an inner ring nozzle 71, an intermediate ring nozzle 72 and an outer ring nozzle 73, the groove 22 includes an inner ring groove 221, an intermediate ring groove 222 and an outer ring groove 223, and the flow passage includes an inner ring flow passage, an intermediate ring flow passage and an outer ring flow passage, which are respectively formed with an inner ring gas port 161, an intermediate ring gas port 162 and an outer ring gas port 163 at the inner peripheral wall of the valve chamber 12. After the fuel gas enters the valve core hollow cavity 23 through the rotary matching valve cavity air inlet 131 and the valve core air inlet 211 which can adjust the fuel gas inlet, the fuel gas flows from each groove 22 of the valve core 2 to each nozzle 7 through each flow passage in sequence, so that the synchronous change adjustment of the internal, middle and external three-ring fire behaviors is realized, and the structure of the fuel gas valve is simpler.

As shown in fig. 14, the inner ring groove 221, the middle ring groove 222 and the outer ring groove 223 are all incomplete ring grooves, so that each groove 22 and the corresponding air port can be controlled to be opened or closed by the rotation of the valve core 2, so that each flow passage can be opened or closed by the rotation of the valve core 2.

As shown in fig. 15, the inner ring air port, the middle ring air port and the outer ring air port may be sequentially spaced at 90 ° on the inner peripheral wall of the valve chamber.

As shown in fig. 12a to 12c and fig. 13a to 13c as enlarged views thereof, in general, the spool 2 is rotated from the closed position to the firing position (see fig. 12a and 13 a), the maximum firing position (see fig. 12b and 13 b), and the minimum firing position (see fig. 12c and 13 c) in this order in the firing rotation direction. Wherein, when rotating from the ignition position to the maximum fire position, the overlapped opening area 3 gradually increases from zero to the maximum area value, and the inner ring groove 221, the middle ring groove 222 and the outer ring groove 223 are respectively communicated with the inner ring air port 161, the middle ring air port 162 and the outer ring air port 163; when rotating from the maximum fire position to the minimum fire position, the overlapping opening area 3 gradually decreases from the maximum area value to the first set area value, and the inner ring groove 221, the middle ring groove 222, and the outer ring groove 223 remain in communication with the inner ring gas port 161, the middle ring gas port 162, and the outer ring gas port 163, respectively.

In particular, in the gas valve of the present invention, as shown in fig. 12d and 13d, the outer ring fire closing position provided at a later interval in the firing rotation direction may be further included, and when rotating from the minimum fire position to the outer ring fire closing position, the overlapping opening area 3 gradually decreases from the first set area value to the second set area value, the inner ring groove 221 and the middle ring groove 222 remain in communication with the inner ring gas port 161 and the middle ring gas port 162, respectively, and the outer ring groove 223 is positionally offset from the outer ring gas port 163.

Meanwhile, as shown in fig. 12e and 13e, in particular, the spark rotation direction may further include a rotation limit position spaced after the outer ring fire closing position, and when the outer ring fire closing position is rotated to the rotation limit position, the overlapping opening area 3 gradually decreases from the second set area value to the minimum area value, the inner ring groove 221 remains in communication with the inner ring air port 161, the outer ring groove 223 remains in positional offset from the outer ring air port 163, and the middle ring groove 222 is in positional offset from the middle ring air port 162. At this time, the valve core 2 rotates to a 235 ° position, both the outer ring fire and the middle ring fire are extinguished, and when the valve core 2 is at the rotation limit position, only the inner ring fire burns in the minimum state.

The fire adjusting belt rotating from the minimum fire position to the outer ring fire closing position and the rotation limit position is a preferable frequency band of the gas valve, and the gas valve has the function of adjusting the fire of each ring to be the same in size, so that the synchronous adjustment angle range is wide enough, the gears are more, and the design is more humanized.

In combination with the scheme, the gas valve of the preferred embodiment of the invention is a gas valve with stepless speed regulation of inner, middle and outer three-ring fires from 90 degrees to 200 degrees, wherein the 0-degree position is an initial closing position; 90 degrees is the maximum fire position of the inner, middle and outer three-ring fires; 200 degrees is the minimum fire position of the inner, middle and outer three-ring fires; 220 DEG is the closing position of the outer ring fire, and the inner and middle three ring fires are in the minimum state; 235 degrees is the rotation limit position, only the inner ring fire is in the minimum state, and other ring fires are closed.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims

1. A gas valve comprising a valve body (1) and a hollow valve core (2), wherein the valve core (2) is pivotably arranged in a valve cavity (12) of the valve body (1), characterized in that the valve cavity (12) comprises a valve cavity bottom wall (13) provided with a valve cavity air inlet (131), the valve core (2) comprises a valve core body (25), the valve core body (25) comprises a valve core bottom wall (21) serving as a valve core air inlet regulating piece and provided with a valve core air inlet (211), the valve core bottom wall (21) and the valve core body (25) are integrally formed, the valve core bottom wall (21) is laminated above the valve cavity bottom wall (13) and can rotate relative to the valve cavity bottom wall (13) so as to regulate the air inlet of the valve cavity (12) through the change of the overlapped opening area (3) of the valve cavity air inlet (131) and the valve core air inlet (211), the valve cavity air inlet (131) is a rectangular opening extending along the radial direction, the valve core air inlet (211) is a circular opening comprising an inner circle (212) and an outer circle (213) which are radially spaced, the inner circle (212) is a circle segment comprising an arc line (213) which is concentric with the initial circle segment (213) of the valve core (213), the initial gradual change line segment (214) extends radially outwards from a circumferential initial end of the valve core air inlet (211), and the approaching gradual change line segment (215) extends radially inwards from the tail end of the initial gradual change line segment (214) towards the circumferential tail end of the valve core air inlet (211) and gradually approaches the inner circular arc line (212) in the radial direction.

2. The gas valve according to claim 1, characterized in that the overlap opening area (3) between the valve spool inlet port (211) and the valve cavity inlet port (131) gradually increases from zero and then gradually decreases to zero during the full rotation of the valve spool (2) in the direction of the ignition rotation.

3. The gas valve according to claim 1, characterized in that the initial gradual change line segment (214) is a straight line segment and the close gradual change line segment (215) is an arc segment.

4. The gas valve according to claim 1, characterized in that the radial length of the valve cavity inlet (131) is greater than the maximum radial length of the spool inlet (211); when the overlapping opening area (3) is greater than zero, the radially inner side edge of the valve cavity air inlet (131) is tangential to the inner circular arc line (212) or at least part of the radially inner side edge is positioned on the radially inner side of the inner circular arc line (212), and at least part of the radially outer side edge of the valve cavity air inlet (131) is positioned on the radially outer side of the outer annular line (213).

5. The gas valve according to claim 1, characterized in that the central angle of the initial gradual line segment (214) ranges from 30 ° to 60 °, and the central angle of the converging gradual line segment (215) ranges from 120 ° to 180 °.

6. Gas valve according to claim 1, characterized in that it comprises a valve stem (4) mounted on top of the valve body (1) and driving the valve core (2) in rotation, an elastic pre-compression element (5) being provided between the bottom end of the valve stem and the top end of the valve core (2), which is arranged to keep the valve core bottom wall (21) elastically pressed against the valve cavity bottom wall (13).

7. The gas valve according to claim 1, characterized in that a circumferential sealing ring (6) is provided between the bottom end inner circumferential wall of the valve chamber (12) and the bottom end outer circumferential wall of the valve cartridge (2).

8. Gas valve according to claim 1, characterized in that the valve body (1) is provided with a total gas inlet (14) and a gas inlet chamber located below the valve chamber bottom wall (13), the total gas inlet (14), the gas inlet chamber and the valve chamber gas inlet (131) being in turn connected.

9. The gas valve according to any one of claims 1 to 8, characterized in that the gas valve comprises a plurality of nozzles (7), the valve body (1) is provided with flow passages which are respectively communicated with the nozzles (7) from the valve cavity (12), a plurality of grooves (22) which are respectively communicated with a valve core hollow cavity (23) and are axially spaced from each other are arranged on the peripheral wall of the valve core (2), and the grooves (22) are in one-to-one correspondence with corresponding air ports of the flow passages on the inner peripheral wall of the valve cavity (12) so as to supply air to the nozzles (7).

10. The gas valve according to claim 9, wherein the nozzle (7) includes an inner ring nozzle (71), an intermediate ring nozzle (72), and an outer ring nozzle (73), the groove (22) includes an inner ring groove (221), an intermediate ring groove (222), and an outer ring groove (223), and the flow passage includes an inner ring flow passage, an intermediate ring flow passage, and an outer ring flow passage, which are formed with an inner ring gas port (161), an intermediate ring gas port (162), and an outer ring gas port (163), respectively, at inner peripheral walls of the valve chamber (12).

11. The gas valve according to claim 10, characterized in that the inner ring groove (221), the middle ring groove (222) and the outer ring groove (223) are all incomplete ring grooves, so that the opening or closing of each groove (22) and the corresponding gas port can be controlled by the rotation of the valve core (2).

12. The gas valve according to claim 10, characterized in that the valve element (2) rotates in sequence from a closed position to an ignition position, a maximum fire position and a minimum fire position in the direction of the ignition rotation;

wherein when the ignition position is rotated to the maximum fire position, the overlapped opening area (3) is gradually increased from zero to a maximum area value, and the inner ring groove (221), the middle ring groove (222) and the outer ring groove (223) are respectively communicated with the inner ring air port (161), the middle ring air port (162) and the outer ring air port (163); and

when rotating from the maximum fire position to the minimum fire position, the overlapped opening area (3) gradually decreases from the maximum area value to a first set area value, and the inner ring groove (221), the middle ring groove (222) and the outer ring groove (223) are respectively communicated with the inner ring air port (161), the middle ring air port (162) and the outer ring air port (163).

13. The gas valve of claim 12, further comprising an outer ring fire shut-off position spaced after the minimum fire position in the firing rotation direction, the overlap opening area (3) gradually decreasing from the first set area value to a second set area value as rotated from the minimum fire position to the outer ring fire shut-off position, the inner ring groove (221) and the middle ring groove (222) maintaining communication with the inner ring gas port (161) and the middle ring gas port (162), respectively, the outer ring groove (223) being positionally offset from the outer ring gas port (163).

14. The gas valve according to claim 13, further comprising a rotational limit position spaced after the outer ring fire closing position in the firing rotation direction, the overlapping opening area (3) gradually decreasing from the second set area value to a minimum area value when rotated from the outer ring fire closing position to the rotational limit position, the inner ring groove (221) remaining in communication with the inner ring gas port (161), the outer ring groove (223) remaining in positional offset from the outer ring gas port (163), the middle ring groove (222) being positional offset from the middle ring gas port (162).