CN114183563B

CN114183563B - Anti-backfire gas plug valve

Info

Publication number: CN114183563B
Application number: CN202111341942.2A
Authority: CN
Inventors: 梁圣佶; 王振华; 梁垚垚; 潘赛斌; 屠飞英; 章永钏; 黄慧慧
Original assignee: Zhejiang Xintao Intelligent Control Technology Co ltd
Current assignee: Zhejiang Xintao Intelligent Control Technology Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-11-11
Anticipated expiration: 2041-11-12
Also published as: CN114183563A

Abstract

The application discloses a gas plug valve for preventing backfire, which comprises a valve body, a valve core, a thimble and a valve rod, wherein a gas inlet channel, a valve core cavity and a first gas outlet channel which are sequentially communicated are arranged in the valve body; one end of the thimble is used for receiving the valve rod, and the other end of the thimble penetrates out of the valve core from the central hole; the sealing assembly is used for blocking air inflow to the central hole and is linked with the ejector pin. The gas plug valve in this application, when the airflow of air outlet channel is not enough, can block through seal assembly and admit air to the case, and then avoid cooking utensils tempering phenomenon to appear.

Description

Anti-backfire gas plug valve

Technical Field

The invention relates to a gas valve, in particular to an anti-backfire gas plug valve.

Background

The gas plug valve is a core component of a gas cooker and generally comprises a valve body, a valve core, a valve rod, a shifting fork and an electromagnetic valve, wherein a gas inlet channel, a gas outlet channel and a valve core cavity between the gas inlet channel and the gas outlet channel are arranged inside the valve body, the valve core is in a frustum shape and is arranged in the valve core cavity, and one end of the valve rod extends into the valve body and penetrates through the valve core. When the plug valve needs to be opened, the valve rod jacks the electromagnetic valve through the shifting fork, and the valve core can be driven to rotate after the valve rod is opened, so that the gas flow in the gas outlet channel can be regulated.

The burner of the stove generally has inner ring and outer loop, the corresponding cock valve has outer loop air outlet channel and inner ring air outlet channel inside, inner ring air outlet channel and outer loop air outlet channel and case chamber intersect and form inner ring gas outlet and outer loop gas outlet at case chamber lateral wall, be provided with on the corresponding case with inner ring gas outlet and outer loop gas outlet complex inner ring gas distribution hole and outer loop gas distribution hole, in the case rotation in-process, gas outlet and gas distribution hole overlap area change, and then can change the gas flow in the air outlet channel.

The so-called stove backfire is a combustion phenomenon that flame retracts into the inner cavity of a stove to generate 'explosion', and is mainly caused by the fact that the flow of fuel gas is too small. As long as the cooker is opened, the inner ring is always in a state with fire, but the outer ring may have a stage without fire, the firepower of the outer ring is reduced from high to low, and finally the outer ring reaches a state without fire (or from no to present), the gas flow of the process is gradually reduced, and backfire caused by insufficient gas flow may occur at the position where the outer ring just fires.

Disclosure of Invention

The invention provides an anti-backfire gas plug valve, which solves the problem that the traditional plug valve has backfire at the position where an outer ring just fires.

The application provides a pair of gas plug valve of anti-backfire includes:

the valve comprises a valve body, wherein an air inlet channel, a valve core cavity and a first air outlet channel which are sequentially communicated are arranged inside the valve body, the first air outlet channel is intersected with the valve core cavity, and a first air outlet is formed in the side wall of the valve core cavity;

the valve core is rotatably assembled in the valve core cavity and is provided with a central hole which is communicated with the air inlet channel and is arranged along the axial direction and an air distribution hole which is communicated with the central hole and corresponds to the first air outlet, and the first air outlet and the air distribution hole are staggered or communicated in the rotating process of the valve core;

one end of the valve rod penetrates through the valve body to be combined with the valve core and is used for operating the valve core to rotate;

one end of the ejector pin is used for bearing the valve rod, and the other end of the ejector pin penetrates out of the valve core from the central hole;

and the sealing assembly is used for blocking air inflow to the central hole and is linked with the ejector pin.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative may be combined individually for the above general solution or between several alternatives without technical or logical contradictions.

Optionally, the sealing assembly is arranged at an end portion of the thimble, which penetrates out of the valve core.

Optionally, the sealing assembly includes a sealing ring disposed on the ejector pin, the sealing ring is matched with the bottom end of the valve core to seal the bottom opening of the central hole, and the sealing ring is separated from the valve core in the process of moving down along with the ejector pin.

Optionally, a limiting step for limiting the movement of the sealing ring is arranged on the thimble.

Optionally, the ejector pin is sleeved with an elastic piece for driving the ejector pin to reset.

Optionally, in the rotation process of the valve core, after the air distribution hole is communicated with the first air outlet or before the air distribution hole is staggered by a certain angle, the thimble drives the sealing assembly to move, so that the blocking of air inlet is removed.

Optionally, one end of the valve rod penetrating into the valve body is provided with a first shifting needle extending along the radial direction, the inner wall of the valve core cavity is provided with a step surface extending along the circumferential direction and matched with the first shifting needle, and when the first shifting needle rotates to the step surface, the ejector pin moves downwards.

Optionally, a plurality of gear grooves are formed in the step surface, the corresponding valve core is provided with a plurality of air distribution holes, and when the first shifting pin is located in one of the gear grooves, the first air outlet is in butt joint with one of the air distribution holes.

Optionally, a second shifting needle extending along the radial direction is arranged at the end of the valve rod, a limiting block matched with the second shifting needle is arranged on the inner wall of the valve core cavity, and when the second shifting needle abuts against the limiting block, the rotation angle of the valve core is 0 degree.

Optionally, one end of the valve rod penetrating into the valve body is provided with a first shifting needle extending along a radial direction, the inner wall of the valve core cavity is provided with a step surface extending along a circumferential direction and matched with the first shifting needle, and when the first shifting needle rotates to the step surface, the ejector pin moves downwards to release the blocking of the sealing assembly on air inlet;

the extending direction of the second poking needle is opposite to that of the first poking needle, and the limiting block is located on the inner side of the step surface.

Optionally, the valve body includes a valve seat with a valve core cavity and a valve cover matched with the valve seat to close the valve core cavity, and the step surface and the limiting block are located on the inner side of the valve cover.

Optionally, a second air outlet channel is arranged inside the valve body, the second air outlet channel intersects with the valve core cavity to form a second air outlet, an air inlet communicated with the air inlet channel and the valve core cavity is formed in the side wall of the valve core cavity, and an air distribution groove which is in butt joint with the air inlet and the second air outlet and extends along the circumferential direction is formed in the side wall of the valve core.

Optionally, the gas distribution groove is divided into multiple sections which are communicated, and the distance between two adjacent sections is not greater than the width of the second gas outlet.

Optionally, the gas distribution groove is divided into a first section, a second section and a third section, wherein the length of the second section is greater than that of the first section and that of the third section.

The gas plug valve in this application, when the airflow of air outlet channel is not enough, can block through seal assembly and admit air to the case, and then avoid cooking utensils tempering phenomenon to appear.

Drawings

FIG. 1 is a schematic structural diagram of a gas plug valve according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of another view of the gas plug valve in FIG. 1;

FIG. 3 is a cross-sectional view of a gas plug valve according to one embodiment of the present disclosure;

FIG. 4 is an enlarged view of the part A in FIG. 3;

FIG. 5 is an enlarged view of the portion B of FIG. 3;

FIG. 6 is a schematic view of the seal assembly of FIG. 3 illustrating the structure of the unsealing center hole;

FIG. 7 is a cross-sectional view of the gas plug valve of FIG. 1 from another angle;

FIG. 8 is an enlarged view of the portion C of FIG. 7;

FIG. 9 is a schematic view of the seal assembly of FIG. 7 opening the central opening;

FIG. 10 is a schematic view of the valve cartridge of FIG. 9;

FIG. 11 is a schematic view of the valve core of FIG. 10 from another perspective;

FIG. 12 isbase:Sub>A cross-sectional view A-A of FIG. 11;

FIG. 13 is a schematic view of the valve stem and valve cover of FIG. 1;

FIG. 14 is a schematic illustration of the valve stem of FIG. 13;

FIG. 15 is a schematic structural view of the valve cover of FIG. 13;

FIG. 16 is a schematic structural view of the valve body of FIG. 1;

FIG. 17 is a schematic view of the fork of FIG. 3;

FIG. 18 is a schematic view of the bottom cover of FIG. 3;

FIG. 19 is a gas distribution diagram with the valve core rotated at 0 and 30 degrees;

FIG. 20 is a gas distribution diagram with the valve core rotated at 60 and 90 degrees;

FIG. 21 is a valve timing diagram with 130 and 165 degrees of valve core rotation;

fig. 22 is a valve timing diagram when the valve element rotates 200 degrees and 230 degrees.

The reference numbers in the figures are as follows:

100. a gas plug valve;

10. a valve body; 11. a valve seat; 111. an air intake passage; 112. a first air outlet channel; 113. a second outlet channel; 114. a first air outlet; 115. a second air outlet; 116. a shift fork cavity; 117. a valve core cavity; 118. an air inlet; 12. a valve cover; 121. a step surface; 122. a gear groove; 123. a limiting block; 124. a via hole; 125. positioning blocks; 13. a bottom cover; 131. a support plate;

20. a valve stem; 21. an operation end; 22. a mating end; 23. a first setting pin; 24. a second setting pin;

30. a valve core; 31. a central bore; 32. air distribution holes; 33. a gas distribution tank; 331. a first stage; 332. a second section; 333. a third stage; 334. connecting holes; 34. a notch groove;

40. a thimble; 41. an elastic member; 42. a clamp spring;

50. a seal assembly; 51. a seal ring; 52. a limiting step;

60. an electromagnetic valve;

70. a shifting fork; 71. a hinged end; 72. an acting end; 73. a trigger protrusion; 74. a rotating shaft.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 18, an embodiment of the present application provides a gas plug valve 100, which includes a valve body 10, a valve core 30 installed inside the valve body, and a valve rod 20 having one end extending into the valve body 10 to be combined with the valve core 30, an air inlet channel 111, a valve core cavity 117, a first air outlet channel 112, and a second air outlet channel 113 that are sequentially communicated are provided inside the valve body 10, the first air outlet channel 112 and the second air outlet channel 113 intersect with the valve core cavity 117, and a first air outlet 114 and a second air outlet 115 are formed on a side wall of the valve core cavity 117.

The valve core 30 is approximately frustum-shaped and is provided with a large end and a small end which are oppositely arranged; the side wall of the spool 30 is tightly attached to the inner wall of the spool chamber 117, so that media (such as natural gas) can be prevented from overflowing from the side wall of the spool 30 to the inner wall of the spool chamber 117. One end of the spool chamber 117 in the axial direction of the spool 30 opens to the intake passage 111, and the small end of the spool 30 faces the intake passage 111. In addition, the side wall of the spool chamber 117 has an intake port 118 that communicates with the intake passage 111 and the spool chamber 117.

The valve core 30 is provided with a central hole 31, an air distribution hole 32 and an air distribution groove 33, the central hole 31 is arranged along the axial direction of the valve core 30, the air distribution hole 32 and the air distribution groove 33 are both positioned on the side wall of the valve core 30, the air distribution groove 33 and the air distribution hole 32 are arranged in a staggered mode in the axial direction of the valve core 30, the central hole 31 is communicated with the air inlet channel 111, the air distribution hole 32 is communicated with the central hole 31 and is in butt joint with the first air outlet 114, and the air distribution groove 33 extends along the circumferential direction of the valve core 30 and is in butt joint with the air inlet 118 and the second air outlet 115.

The valve core 30 is rotatably assembled in the valve core chamber 117, during the rotation of the valve core 30, the first air outlet 114 and the air distribution hole 32 are dislocated or communicated, and in the communication state, the overlapping area of the first air outlet 114, the second air outlet 115 and the air distribution hole or air distribution groove on the valve core can be changed, so as to change the air flow inside the first air outlet channel 112 and the second air outlet channel 113.

The burner of the stove generally has an inner ring and an outer ring, and the corresponding first air outlet channel 112 and the second air outlet channel 113 are respectively connected with the outer ring and the inner ring of the stove through pipelines. When the cooker is in an open state, the inner ring of the cooker is always in a fire state, but the outer ring of the cooker can have a fireless state by adjusting the fire power, the fireless state is changed from the fireless state to the fireless state (or the fireless state to the fireless state), and the backfire can exist in the outer ring.

The firepower stated in this application is for cooking utensils inner ring and outer loop, and it means the gas outlet volume size of air outlet channel to correspond to the gas valve, and for convenience of expression in this field, the gas outlet volume of gas valve is expressed with firepower size usually.

In order to solve the backfire problem, in the present embodiment, an ejector pin 40 is disposed in the central hole of the valve core 30, the ejector pin 40 is rod-shaped and has a first end and a second end opposite to each other, the second end of the ejector pin 40 protrudes out of the valve core 30, and the end of the end has a sealing assembly 50 for blocking air intake into the central hole 31.

For convenience of description, it is assumed that when the valve element 30 is rotated from zero to an angle α, the air distribution hole 32 and the first air outlet passage 112 are switched from a misaligned state to a communicated state. That is to say, the outer ring of the stove is in a non-fire state when the rotation angle of the valve core is from zero to α degrees, and is in a fire state when the rotation angle is greater than α degrees, so that the gas flow of the first gas outlet channel 112 is smaller near the rotation angle α of the valve core 30, which results in the occurrence of a backfire phenomenon.

This application is through setting up seal assembly 50 at thimble tip, when case 30 rotated near alpha angle, blocks the admit air, avoids appearing the tempering. When the gas flow is large enough, the sealing is released, so that the outer ring of the cooker is exposed to fire, that is, the sealing is released in the state that the gas distribution hole 32 is communicated with the first gas outlet channel 112, and the sealing releasing time is the time when the rotation angle of the valve core is larger than the angle alpha.

In the configuration of the sealing assembly 50, referring to fig. 4, in one embodiment, the sealing assembly 50 includes a sealing ring 51 and a limiting step 52, the sealing ring 51 is sleeved on an end portion of the thimble 40 and is engaged with a small end surface of the valve core 30 to seal a bottom end opening (a side facing the air inlet channel 111) of the central hole 31, and the limiting step 52 is disposed at a second end of the thimble 40 to limit the movement of the sealing ring 51 on the thimble 40.

In this embodiment, as shown in fig. 5, the first end of the thimble 40 is provided with an elastic member 41, and the elastic member 41 can drive the sealing ring 51 to seal the bottom opening of the central hole 31. Preferably, the elastic element 41 is a spring, a first end of the thimble 40 penetrates through the valve core 30, and a clamp spring 42 is arranged on the first end, and one end of the spring abuts against the clamp spring 42, and the other end abuts against the valve core 30.

As shown in fig. 10 to 15, the valve body 10 includes a valve seat 11 having a valve core cavity 117, and a valve cover 12 cooperating with the valve seat 11 to close the valve core cavity 117, the valve cover 12 is fixed to the valve seat 11 by means of screws or the like, and the valve stem 20 has an opposite operating end 21 and a mating end 22, wherein the mating end 22 of the valve stem 20 passes through the valve cover 12 and cooperates with the valve core 30. Wherein the bonnet 12 has a through-hole 124 through which the valve stem 20 passes.

The mating end 22 of the valve rod 20 abuts against the thimble 40 and has a first setting hand 23 and a second setting hand 24 extending in a radial direction, and the second setting hand 24 extends in a direction opposite to the first setting hand 23. The first setting hand 23 is cylindrical (the cross section of the first setting hand 23 is circular), the second setting hand 24 is polygonal cylindrical (for example, the cross section of the second setting hand 24 is rectangular), and the length of the first setting hand 23 is longer than that of the second setting hand 24. The first shifting needle 23 is inserted and fixed on the valve rod 20, and the second shifting needle 24 and the valve rod 20 are integrally arranged.

The end of the valve core 30 facing the valve cover 12 is provided with a cut groove 34, and the first shifting needle 23 and the second shifting needle 24 extend into the two cut grooves 34, so that the valve core 30 can be driven to rotate by operating the valve rod 20. In order to ensure the operation accuracy, at least one half of the first shifting pin 23 extends into the notch groove 34 in the fire adjusting stage, and the gap between the first shifting pin and the notch groove is ensured to be small enough.

In order to realize multi-gear adjustment and zero-degree limiting, a damping position used for indicating firepower gears is arranged on the rotating path of the first shifting needle on the inner wall of the valve core cavity, a limiting position used for limiting the rotation of the valve rod is arranged on the rotating path of the second shifting needle, the firepower gears refer to the gas outlet quantity of the valve body, and the firepower gears refer to the gas outlet quantity gears. In this embodiment, the inner side of the valve cap 12 has a step surface 121 and a stopper 123, and the stopper 123 is located inside the step surface 121 along the radial direction of the valve rod 20, so that the first setting pin 23 is matched with the step surface 121, and the second setting pin 24 is matched with the stopper 123. The step surface 121 is substantially a sector ring, and two ends of the step surface 121 are provided with positioning blocks 125 for limiting the rotation range of the first setting pin 23.

The step surface 121 extends along the circumferential direction of the valve rod 20 and is provided with a plurality of gear grooves 122, the corresponding valve core 30 is provided with a plurality of air distribution holes 32, and when the first shifting pin 23 is located in one of the gear grooves 122, the first air outlet 114 is abutted to one of the air distribution holes 32. The inner wall of the gear slot 122 is disposed in a cambered surface, so that the first dial 23 can be switched in each gear slot 122. The air distribution holes 32 are circumferentially arranged along the valve core 30, and each air distribution hole 32 is a stepped hole, so that the stability of the air outlet amount of each gear is ensured.

The stopper 123 is mainly for when the zero degree angle of valve rod (gas valve closed state) restriction valve rod's rotation, so-called auto-lock function that resets promptly, therefore stopper 123 is perpendicular with the zero degree angle cooperation position of valve rod 20 and sets up, and sets up for the slope at the opposite side, and the second of being convenient for dials needle 24 and can cross stopper 123 for zero degree angle can be got back to valve rod 20. In order to ensure the safety, in the closed state of the gas valve, the second shifting needle 24 abuts against the inner wall of the valve core cavity, and a gap is formed between the first shifting needle and the inner wall of the valve core cavity, so that the second shifting needle 24 is ensured to be in an abutting state with the limiting block 123 at a zero angle.

In order to realize the reset self-locking function, it is easy to think that a limit block is arranged on the moving path of the first shifting needle 23, but because the cross section of the first shifting needle 23 is circular, the height of the limit block 123 is inevitably required to be larger than that of the first shifting needle 23, so that the stroke of a valve rod is longer when the gas valve is opened, and the valve body is higher as a whole. The problem can be solved by arranging two shifting needles, and because the cross section of the second shifting needle 24 is rectangular, the height of the limiting block is not necessarily required to be larger than that of the second shifting needle 24, so that the stroke of the valve rod is shorter when the gas valve is opened. As can be seen from the figure, the height of the stop block 123 is lower than the step surface 121 and the second setting hand 24, so that the opening stroke of the valve rod is short enough.

As described above, when the second setting hand 24 abuts against the stopper 123, the rotation angle of the valve core 30 is zero degree; when the first shifting pin 23 rotates to the step surface 121, the valve rod 20 pushes the ejector pin 40 to move downwards, the air inlet blocking of the sealing component 50 is released, and the air inlet of the outer ring of the stove starts.

The valve body 10 is provided with an electromagnetic valve 60, and the electromagnetic valve 60 is used for controlling the on-off of the air inlet passage 111. The range is generally provided with a thermocouple which is connected with the electromagnetic valve 60, when the range is flamed out, the thermocouple cannot provide electromotive force for the electromagnetic valve, the electromagnetic valve 60 is closed to block the air inlet channel 111, and the flameout protection function is achieved.

In this embodiment, the rotation angle of the valve core 30 is in the range of 0 to α degrees, at this time, the first setting hand 23 is not located on the step surface 121, and the sealing assembly 50 blocks air intake; when the angle of the valve core 30 is slightly larger than α degrees, the first setting pin 23 is located on the step surface 121, and the valve rod 20 pushes the thimble 40 to unblock the seal assembly 50.

In the present embodiment, as shown in fig. 16 to 18, the air inlet channel 111 includes a fork cavity 116, a fork 70 is installed in the fork cavity 116 as an interlocking member between the ejector pin 40 and the solenoid valve 60, and the air inlet 118 communicates the fork cavity 116 with the spool cavity 117. The valve body 10 further comprises a bottom cover 13 for sealing the shifting fork cavity 116, the bottom cover 13 is fixed on the valve body 10 through screws and the like, and the bottom cover 13 and the valve cover 12 are respectively located on two sides of the valve body 10.

The fork 70 is substantially L-shaped, and a trigger protrusion 73 is disposed at an outer side of a corner of the L-shape, one end of the fork 70 is a hinge end 71 rotatably connected to the valve body 10, and the other end is an action end 72 engaged with the thimble 40, when the thimble 40 pushes the fork 70, the trigger protrusion 73 pushes the solenoid valve 60 open, so as to open the air inlet passage 111.

The fork cavity 116 includes at least a first cavity and a second cavity that are communicated with each other, and there is no strict limit between the first cavity and the second cavity. The first cavity is located between the bottom cover 13 and the valve core cavity 117, and the acting end 72 of the shifting fork 70 is located in the first cavity; the second cavity is located between the valve core cavity 117 and the air inlet channel 111, and the hinged end 71 of the shift fork 70 is rotatably connected with the side wall of the second cavity opposite to the bottom cover 13.

In this embodiment, the fork 70 has two shafts 74 on both sides of the hinged end 71, and the bottom cover 13 has two support plates 131 arranged side by side on the inner side, and the ends of the support plates 131 respectively act on the corresponding shafts 74 to make the shafts 74 rotatably fit with the inner wall of the fork cavity 116.

In this embodiment, the air distribution groove 33 is divided into multiple connected sections, the distance between two adjacent sections is not greater than the width of the second air outlet 115, and the sections are connected through the connecting hole 334. In the process that the valve core 30 rotates from zero degree to the maximum angle, the second air outlet 115 is always communicated with the corresponding section of the air distribution groove 33.

The gas distribution groove 33 is divided into a first section 331, a second section 332 and a third section 333, wherein the length of the second section 332 is greater than that of the first section 331 and the third section 333; the first section 331 and the third section 333 are located on both sides of the second section 332 in the axial direction of the spool 30. In the present embodiment, the first section 331 and the third section 333 have the same length and the same distance from the second section 332 in the circumferential direction of the valve element 30.

In this embodiment, the circle center angle corresponding to the length of the gas distribution groove 33 is 273 degrees, the circle center angle corresponding to the length of the first section 331 and the third section 333 is 19 degrees, the circle center angle corresponding to the length of the second section 332 is 200 degrees, and the circle center angle corresponding to the gap length between the first section 331 and the second section 333 and the second section 332 is 16 degrees.

As shown in fig. 19 to 22, in the closed state of the gas valve, when the rotation angle of the valve core 30 is zero, the first gas outlet 114 and the gas distribution hole 32 are in a misaligned state in the circumferential direction of the valve core 30; at least one of the second outlet port 115 and the inlet port 118 and the distribution groove 33 are in a misaligned state in the circumferential direction of the spool 30.

When starting the gas valve, need impel and rotate valve rod 20, make second shifting needle 24 on the valve rod 20 cross stopper 123, valve rod 20 pushes down thimble 40, through the transmission of shift fork 70, backs down solenoid valve 60, lets the gas get into inlet channel 111's inside, and the clamp plate can trigger the micro-gap switch simultaneously, ignites, and the furnace end burning of stove. If the rotation angle of the valve rod 20 is less than 30 degrees, after the valve rod 20 is released, the valve rod 20 and the thimble 40 return under the action of the spring, and the sealing assembly 50 seals and blocks the air inlet again.

At the position of 30 degrees of rotation of the valve rod, the first air outlet 114 is communicated with the air distribution hole 32, the air distribution groove 33 is communicated with the air inlet 118 and the second air outlet 115, but at the moment, due to the blocking effect of the sealing assembly 50, the central hole 31 is not communicated with the air inlet channel 111, and the outer ring is actually in a fireless state. The second air outlet 115 is always in communication with the air inlet passage 111, so the inner ring is in a small fire state.

If the valve rod 20 is rotated continuously, the first shifting needle 23 jumps to the upper step surface 121, the valve rod 20 presses the thimble 40 downwards, the sealing assembly 50 is separated from the valve core 30, and the blocking of air inlet is released. Due to the step surface 121 having the shift groove 122, the valve stem 20 stops when rotated to the corresponding position, for example, 60 degrees, and the outer ring and the inner ring are both in the small fire state.

Along with the rotation of the valve rod 20, the first shifting needle 23 is matched with different gear grooves, and the stove burner presents different firepower, for example, when the stove burner rotates by 90 degrees, the stove burner is in a state of outer ring vigorous fire and inner ring vigorous fire; when the furnace head rotates by 130 degrees, the furnace head is in the state of outer ring big fire and inner ring big fire; when the furnace end rotates to 165 degrees, the furnace end is in the state of middle fire of the outer ring and middle fire of the inner ring.

When the valve rod rotates to 200 degrees, the first shifting needle 23 falls down from the step surface 121 at this time, the sealing assembly 50 is matched with the end part of the valve core 30 again to block the central hole 31, although the first air outlet 114 is communicated with the air distribution hole 32, the outer ring is actually in a fireless state due to the fact that air inlet is blocked, and the inner ring is in a middle-fire state.

When the valve rod 20 rotates to 230 degrees, the first shifting needle 23 jumps up to the step surface 121 again, the sealing assembly 50 releases the blocking of air inlet, but at the moment, the first air outlet 114 and the air distribution hole 32 are staggered, the second air outlet 115 is communicated with the air inlet 118 and the air distribution groove 33, the outer ring is in a fireless state, and the inner ring is in a small-fire state.

The angle and the gear can be adjusted according to actual needs, in order to solve the problem of backfire, if the air outlet and the air distribution hole are switched to the communication state from the dislocation state, the valve rod 20 needs to rotate for a certain angle after the communication so as to remove the blocking of the air inlet, and if the communication state is switched to the dislocation state, the air inlet needs to be blocked in advance before the dislocation state, so that the occurrence of a critical state is avoided.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features. Features of different embodiments are shown in the same drawing, which is to be understood as also disclosing combinations of the various embodiments concerned.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

1. Anti-backfire gas plug valve, its characterized in that includes:

the sealing assembly is used for blocking air inflow to the central hole and is linked with the ejector pin; in the process that the valve core rotates from the dislocation direction of the air distribution hole and the first air outlet to the communication direction, the angle of continuous rotation after the air distribution hole is communicated with the first air outlet exceeds a certain angle, and the thimble drives the sealing assembly to move, so that the blocking of air inlet is removed.

2. The gas plug valve of claim 1, wherein the sealing assembly is disposed at an end of the thimble that protrudes through the valve core.

3. The gas plug valve of claim 2, wherein the sealing assembly includes a sealing ring disposed on the thimble, the sealing ring cooperating with the bottom end of the valve plug to seal the bottom opening of the central bore, the sealing ring being disengaged from the valve plug during downward movement of the thimble.

4. The gas cock valve of claim 3, wherein the thimble is provided with a stop step for limiting the movement of the sealing ring.

5. The gas plug valve of claim 1, wherein the thimble is sleeved with an elastic element for driving the thimble to reset.

6. The gas plug valve according to any one of claims 1 to 5, wherein a first shifting needle extending in the radial direction is provided at one end of the valve rod penetrating into the valve body, a step surface extending in the circumferential direction and matched with the first shifting needle is provided on the inner wall of the valve core cavity, and when the first shifting needle rotates to the step surface, the thimble moves downwards.

7. The gas plug valve of claim 6, wherein a plurality of gear grooves are formed in the step surface, the corresponding valve core is provided with a plurality of air distribution holes, and when the first shifting pin is located in one of the gear grooves, the first air outlet is in butt joint with one of the air distribution holes.

8. The gas plug valve according to claim 1, wherein a second setting needle extending along a radial direction is provided at an end of the valve rod, a limiting block matched with the second setting needle is provided on an inner wall of the valve core cavity, and when the second setting needle abuts against the limiting block, a rotation angle of the valve core is 0 degree.

9. The gas plug valve according to claim 8, wherein one end of the valve rod penetrating into the valve body is provided with a first shifting needle extending along the radial direction, the inner wall of the valve core cavity is provided with a step surface extending along the circumferential direction and matched with the first shifting needle, and when the first shifting needle rotates to the step surface, the ejector pin moves downwards to release the blocking of the sealing component on air inlet;

10. The gas plug valve of claim 9, wherein the valve body includes a valve seat having a valve core cavity and a valve cover cooperating with the valve seat to close the valve core cavity, the step surface and the stop block being located inside the valve cover.

11. The gas plug valve according to claim 1, wherein a second gas outlet channel is arranged inside the valve body, the second gas outlet channel and the valve core cavity are intersected to form a second gas outlet, a gas inlet communicated with the gas inlet channel and the valve core cavity is arranged on the side wall of the valve core cavity, and a gas distribution groove which is in butt joint with the gas inlet and the second gas outlet and extends along the circumferential direction is arranged on the side wall of the valve core.

12. The gas plug valve of claim 11, wherein the gas distribution groove is divided into a plurality of connected sections, and the distance between two adjacent sections is not greater than the width of the second gas outlet.

13. The gas cock valve of claim 12, wherein the gas distribution groove is divided into a first section, a second section, and a third section, wherein the second section is longer than the first section and the third section.