TWM551676U - Safety device capable of adjusting shut-off flow of fuel gas and fuel gas switch with the same - Google Patents

Description

Safety device capable of adjusting gas interception flow and gas switch having such device

This creation relates to a safety device that can adjust the gas shutoff flow and a gas switch having such a device.

Because of the safety measures, a gas switch with a safety valve has been developed. For example, the domestic new patent No. M427500 "Gas Switch" and the No. M504185 "Gas Switch" proposed in the name of the applicant are two cases. The gas switch comprises a casing having a gas passage, and a valve body is arranged between the inflow port and the outflow port of the gas passage, and the knob connected to the valve body is operated by a rotation to change the valve position of the valve body to achieve The function of opening and closing the gas passage. The safety valve is assembled to the inflow port, and includes a bracket having a flow passage, and a valve plug supporting the axial sliding of the bracket, the valve plug being normally urged rearward by the compression spring to keep the flow passage clear. When an accident such as a gas hose breaks or a gas appliance is broken, and the pressure on the outlet side is abnormally lowered, the valve plug resists the elastic force of the spring and is adhered to by the gas pressure difference between the front and the rear. The valve seat, as such, occludes the flow path and blocks the gas.

Because different types of gas appliances consume different energy, for example, the energy consumption of water heaters is higher than that of gas stoves, so the water heaters should be used with gas switches with larger flow rates; in addition, the water heaters vary greatly depending on the amount of water discharged. Must choose the right gas switch. For smaller flow gas switches, it is suitable for gas furnaces.

Since the conventional gas switch with the above safety valve is fixed interrupted The flow design, that is, the function of adjusting the intercepting flow, cannot adjust the gas appliances of different energy consumption. Therefore, manufacturers and distributors of gas switches must simultaneously produce and sell several kinds of different intercepting flows. The gas switch is used to match the gas appliances of different energy consumption, thereby increasing the production and sales costs and the inventory pressure. When replacing the gas appliances with different energy consumption, the gas switch results must also be updated for the gas users. In terms of it, it is an extra expense.

The present invention has been made to solve the above problems, and an object thereof is to provide a safety device capable of adjusting a gas shutoff flow rate and a gas switch having the same, which can adjust the corresponding shutoff flow rate with gas appliances of different energy consumption. .

The safety device for realizing the adjustable gas interception flow of the present invention comprises a body, a sleeve, a safety valve and an adjustment button. The body includes a gas passage having an inflow port and an outflow port, and an assembly hole communicating with the inflow port. The sleeve is fixed to the inflow port of the gas passage and has a flow passage like a bell mouth, and the front end of the flow passage forms a valve seat. The safety valve comprises a cylindrical outer casing assembled to the flow inlet, the inner portion of the outer casing has a bracket for allowing gas to flow, and the casing wall is provided with a rack facing the assembly hole; the safety valve further comprises a direct support a valve plug axially sliding in the center of the bracket or indirectly via a shaft tube, and a spring that normally forces the valve plug to retreat to keep the flow passage unobstructed, and when the pressure on the outlet side is abnormally lowered, the valve The plug is forced to advance because the gas pressure difference between the front and rear is greater than the spring force of the spring until it is closed to the valve seat to block the flow passage. The adjusting button is rotatably mounted on the assembly hole of the body, and has a gear meshing with the rack at the bottom thereof, and the adjusting device pushes the adjusting button to move the outer casing relative to the sleeve, so that the valve plug advances to The narrow opening of the flow path or retreat to the width of the flow path At the mouth, it produces the effect of adjusting the gas to block the flow.

The main body forms a connecting portion and a joint portion on the inflow side and the outflow side of the gas passage to respectively connect a gas pipe, or each is connected to a gas pipe and a mounting object, and the mounting object Including but not limited to gas valves, pressure regulators, timing valves, gas pipe regulating accessories and gas pipe safety accessories.

The casing wall of the outer casing has an elongated hole formed in one of the long sides of the elongated hole, and the gear is sleeved into the elongated hole to engage the rack.

The upper part of the adjusting button includes a ring neck groove which is recessed in the radial direction, and a positioning screw locked to the body extends into the ring neck groove, and the adjusting button is held on the body to be freely rotatable, and at least one The O-ring assembled on the outer circumference of the adjustment knob forms airtight between the adjustment knob and the contact surface of the assembly hole.

The body further includes a mounting hole communicating with the outflow opening, and a reset button and a compression spring are assembled to the mounting hole, and the reset button is held in a tension state by the compression spring, and can be pressed freely, and at least one An O-ring assembled on the outer circumference of the return button forms airtight between the return button and the contact surface of the mounting hole.

The upper portion of the reset button is provided with a recess, and a positioning screw locked to the body extends into the recess, and the reset button is press-fitted to the body.

The gas switch for realizing the creation comprises a body, a sleeve, a safety valve and an adjustment button. The body includes a gas passage having an inflow port and an outflow port, and an assembly hole communicating with the inflow port, and a manually operated and swirling valve body is disposed between the inflow port and the outflow port for opening and closing the valve body Gas passage. The sleeve is fixed to the inflow port of the gas passage and has a flow passage like a bell mouth, and the front end of the flow passage forms a valve seat. The safety valve includes a cylindrical outer casing assembled to the flow inlet, the inner portion of the outer casing has a bracket for allowing gas to flow, and the casing wall has one side a rack to the assembly hole; the safety valve further includes a valve plug directly supported in the center of the bracket or indirectly supported by a shaft tube in the central axial direction of the bracket, and a valve plug is forced to retreat to maintain the flow passage a smooth spring, when the pressure on the outlet side is abnormally dropped, the valve plug is forced to advance because the gas pressure difference between the front and the rear is greater than the spring force of the spring until the valve seat is closed to block the flow passage . The adjusting button is rotatably mounted on the assembly hole of the body, and has a gear meshing with the rack at the bottom thereof, and the adjusting device pushes the adjusting button to move the outer casing relative to the sleeve, so that the valve plug advances to The narrow opening of the flow path or retreats to the wide opening of the flow path, and the effect of adjusting the gas shutoff flow is generated.

The body of the gas switch respectively forms a connecting portion and a joint on the inflow side and the outflow side of the gas passage to respectively connect with a gas pipe and a gas hose.

The casing wall of the casing of the gas switch has an elongated hole formed in one of the long sides of the elongated hole, and the gear is sleeved into the elongated hole to engage with the rack.

The upper portion of the adjusting button of the gas switch includes a ring neck groove recessed in the radial direction, and a positioning screw locked to the body extends into the ring neck groove, and the adjusting button is held on the body to be freely rotatable. And at least one O-ring assembled on the outer circumference of the lower portion of the adjusting button forms airtight between the adjusting button and the contact surface of the assembling hole.

The effect of the present invention against the prior art is that the rotation of the outer casing relative to the sleeve by the rotation adjustment knob advances the valve plug to the narrow opening of the flow passage or back to the wide opening of the flow passage, so that the flow cross-sectional area of the flow passage is made. It can change with the displacement of the valve plug, and achieve the effect of adjusting or reducing the flow rate of the gas appliance with different energy consumption, so that the flow rate specification of the gas switch can be minimized or even simplified. Reduce production and sales costs and inventory pressure, while saving gas users when replacing different energy-consuming appliances, must also update the additional cost of gas safety devices or gas switches.

The detailed technical contents and other objects and features of the present invention can be fully understood by referring to the following description of embodiments with reference to the accompanying drawings.

10‧‧‧Gas safety interrupter

20,20a‧‧‧ Ontology

21‧‧‧ gas passage

22‧‧‧Inlet

23‧‧‧Exit

24‧‧‧Connecting Department

25‧‧‧ joints

26‧‧‧Assembled holes

27‧‧‧Assembly holes

28‧‧‧Development

29‧‧‧Connectors

30‧‧‧ sleeve

31‧‧‧Flow path

32‧‧‧ valve seat

33‧‧‧A male thread

34‧‧‧ trench

35‧‧‧O-ring

36‧‧‧O-ring

37‧‧‧ screw holes

38‧‧‧ screw holes

39‧‧‧Female thread

40‧‧‧Safety valve

41‧‧‧ Shell

42‧‧‧ shaft tube

43‧‧‧ Valve plug

44‧‧‧ Spring

45‧‧‧ bracket

46‧‧‧Long hole

47‧‧‧Racks

48‧‧‧ Department of Management

49‧‧‧ card slot

50‧‧‧Adjustment button

51‧‧‧Knock ring

52‧‧‧Sliding shaft

53‧‧‧Protruding

54‧‧‧ ring neck groove

55‧‧‧Setting screws

56‧‧‧O-ring

57‧‧‧ Gears

58‧‧‧Slots

60‧‧‧Return button

61‧‧‧Compressed spring

62‧‧‧ Groove

63‧‧‧Setting screws

64‧‧‧O-ring

70‧‧‧Installation object

80‧‧‧ gas switch

81‧‧‧ valve body

82‧‧‧ Holes

83‧‧‧ valve seat

84‧‧‧ knob

Figure 1 is an external view of a safety device that can adjust the gas shutoff flow.

Figure 2 is a cross-sectional view of the axial direction (gas flow direction) of the creation, showing the position where the safety valve is adjusted to the intermediate gas shutoff flow, and the solid arrow indicates the gas flow path (the same below).

Figure 3 is an exploded view of the composition of the creation.

Fig. 4 is a cross-sectional view similar to Fig. 2, showing a state in which the valve plug is actuated to close the valve position.

Figure 5 is a schematic diagram of the connection between the author and the installation object.

Figure 6 is an external view of the gas switch of the present invention.

Figure 7 is a cross-sectional view of Figure 6, showing the position of the safety valve adjusted to the maximum gas shutoff flow.

Fig. 8 is a cross-sectional view similar to Fig. 7, showing the position where the safety valve is adjusted to the minimum gas shutoff flow rate, wherein the broken line indicates the state in which the valve plug is actuated to the closed valve position.

As shown in the first to third figures, the "safety device for adjusting the gas interception flow rate" (hereinafter referred to as the gas safety interrupting device) 10 is composed of a body 20, a sleeve 30, and a safety valve 40. , an adjustment button 50 and a reset button 60. among them:

The body 20 includes a combustion disposed along its axial direction (gas flow direction) The gas passage 21 has a first-rate inlet 22 and a first-rate outlet 23, and the gas flows from the inlet 22 to the outlet 23, and is supplied to the gas appliance (not shown) through the gas conduit. The body 21 respectively forms a threaded connection portion 24 and a joint portion 25 on the side of the inflow port 22 and the outlet port 23 to respectively connect the gas pipe, or respectively to the gas pipe and the installation object 70, such as a gas valve, pressure regulating The valve, the timing valve, the gas pipe adjustment fitting or the gas pipe safety attachment or the like are connected (Fig. 5), and the O-ring 36 assembled to the outer periphery of the joint portion 25 is in contact with the mounting object 70 at the joint portion 25. Airtightness is created between the faces to prevent gas leakage. The body 20 further includes an assembly hole 26 and a mounting hole 27 communicating with the inflow port 22 and the outflow port 23, respectively, and the two screw holes 37 and 38 are respectively communicated with the assembly hole 26 and the assembly hole 27, and the assembly hole 26 is an inner diameter. The upper and lower small-diameter holes (in the present description, the up-and-down direction is based on the drawings), the adjustment knob 50 is mounted. The assembly hole 27 is also a different diameter hole, and the upper aperture is the largest, the middle is the second, and the lower portion is the smallest to assemble the reset button 60. The two screw holes 37, 38 are respectively locked by the two positioning screws 55, 63 to the body 20, so that the adjusting button 50 and the reset button 60 are respectively rotatably and press-fitted to the body 20 for the user to manually adjust the gas blocking flow rate. And the safety valve 40 is used for resetting, and the details are left to be described later.

The sleeve 30 is a small-diameter body with a small outer diameter and a large rear end. The front section is provided with a male thread 33 for engaging with the female thread 39 in front of the inflow port 22, and a groove 34 at the rear end for the screwdriver or A similar tool (not shown) screws the sleeve 30 into the inflow port 22 until its front end faces stop at the step face 28 between the inflow port 22 and the outflow port 23, and fits an O-ring 35 assembled on its outer circumference. A good airtightness is formed between the sleeve 30 and the contact surface of the gas passage 21. The inside of the sleeve 30 defines a flow passage 31 like a bell mouth to cooperate with the forward and backward movement of the safety valve 40 to generate a function of adjusting the gas shutoff flow, and the front end of the flow passage 31 forms a valve seat 32. The role is also left to be described later.

The safety valve 40 includes a housing 41, a shaft tube 42, a valve plug 43, and a spring 44. The outer casing 41 is cylindrical and movably assembled to the inflow port 22, and receives the rear portion of the sleeve 30. The bracket 41 has a bracket 45 formed on the inner rear portion to allow gas to flow, and a casing 45 facing the casing wall. The elongated hole 46 of the hole 26 is assembled, and one of the long sides of the elongated hole 46 is formed as a rack 47. The shaft tube 42 is inserted into the tube portion 48 at the center of the bracket 45, and is engaged with the snap ring 51 which is radially recessed from the rear end thereof and the snap ring 51 projecting radially from the rear end of the tube portion 48, The shaft tube 42 is fixed to the tube portion 48 to support axial sliding of the valve plug 43. The valve plug 43 has a substantially umbrella shape, and is supported by the sliding shaft 52 of the shaft tube 42 extending backward to support the axial sliding of the shaft tube 42. Alternatively, the valve plug 43 is indirectly supported by the bracket 45 through the shaft tube 42. The central tube portion 48 is axially slidable. In the embodiment of the drawing, the spring 44 is a tension spring that acts on the outer circumference of the shaft tube 42 and is connected to the shaft tube 42 and the sliding shaft 52 respectively to force the valve by its elastic force. The plug 43 is retracted, and the flow path 31 is kept open. Of course, the safety valve 40 can also be as shown in the prior patent. After a slight change, the compression spring that acts using the compressive force is not limited by the tension spring. At this time, the shaft tube 42 can be omitted, and the valve plug 43 can be directly supported. The tube portion 48 at the center of the bracket 45 slides axially.

The adjusting knob 50 is a large and small outer diameter body having an outer diameter, and has an annular neck groove 54 recessed in the radial direction, and a positioning screw 55 locked to the main body screw hole 37 extends into the ring neck groove 54. The adjusting knob 50 is rotatably held by the body 20, and is formed into a proper airtightness between the contact faces of the adjusting knob 50 and the body assembling hole 26 by the two O-rings 56 assembled on the outer periphery of the lower portion thereof. The adjusting knob 50 further includes a gear 57 formed at the bottom thereof, the gear 57 is fitted into the elongated hole 46 of the outer casing 41 to engage with the rack 47, and the safety valve 40 is moved relative to the sleeve 30 by the rotary adjusting knob 50. In turn, the effect of regulating the gas shutoff flow is generated. Moreover, the upper end surface of the adjusting knob 50 has a groove portion 58 for screwing A sub or similar tool is used to rotate the adjustment knob 50.

The reset button 60 is attached to the fitting hole 27 of the body 20, and is held in a tensioned state by a compression spring 61 to be press-fitted. The reset button 60 is a small-diameter body having a large outer diameter and a small outer diameter, and a groove 62 is formed on the outer periphery of the upper portion, and the reset button 60 is locked by a locking screw 63 that is locked to the main body screw hole 38 and protrudes into the recess 62. The body 20 is held in a press-fit manner, and an O-ring 64 assembled on the outer periphery of the lower portion thereof is used to form a reliable airtightness between the contact faces of the return button 60 and the body fitting hole 27.

As shown in Fig. 4, when an abnormal accident such as a gas hose is broken or the front end thereof is detached from the gas appliance, the gas pressure difference between the front and the rear of the valve plug 43 will be greater than the spring force of the spring 44, thereby forcing the valve plug 43. Advancing toward the sleeve 30 until it is in close contact with the valve seat 32, thus blocking the flow passage 31 and blocking the gas.

The present invention drives the outer casing 41 relative to the sleeve 30 by the forward or reverse rotation adjustment knob 50 to advance the valve plug 43 to the narrow opening of the flow passage 31 or to the wide opening of the flow passage 31 to allow the flow passage. The flow cross-sectional area of 31 can be varied with the displacement of the valve plug 43, and the effect of adjusting the gas shut-off flow rate is generated. It is understood that, as shown in Fig. 2, when the safety valve 40 is advanced as the adjustment knob 50 is reversely rotated, and the valve plug 43 is advanced to the narrow opening of the flow passage 31, the flow passage 31 is circulated at this time. The cross-sectional area becomes smaller, the gas flow rate is relatively small, and the valve plug 43 is closer to the valve seat 32. Therefore, when the spring 44 is actuated to the closed valve position due to the abnormal accident, the spring 44 has less deformation ( That is, the stroke in which the spring 44 is stretched or compressed is short, and the spring force is relatively small. Therefore, the valve plug 43 can be tightly fitted to the valve seat 32 with a small gas flow rate, interrupting the flow passage 31, and stopping the supply of air. On the other hand, when the safety valve 40 is retracted as the adjustment knob 50 is rotated in the forward direction, and the valve plug 43 is retracted to the wide opening of the flow passage 31, since the flow cross-sectional area of the flow passage 31 becomes large, the gas flow rate is relatively Larger, while the valve plug 43 is closer to the valve seat 32 Far, when the spring 44 is actuated to the valve position due to the above-mentioned abnormal accident, the spring 44 has a large deformation amount (that is, the stroke of the spring 44 being stretched or compressed is long), and the elastic force is relatively large, so it is necessary to compare The large gas flow rate pushes the valve plug 43 into close contact with the valve seat 32 to block the gas.

When the valve plug 43 acts, that is, when the valve plug 43 is in close contact with the valve seat 32 to block the flow passage 31, the protruding portion 53 formed at the center of the front end of the valve plug 43 protrudes in front of the sleeve 30 to come to the return button 60. Immediately below, the reset button 60 is then manually pressed, and during the lowering of the reset button 60 (as indicated by the dashed line in Fig. 4), it can push the projection 53 of the valve plug 43 rearward to cause the valve plug 43 to move away from the valve seat 32. When the valve plug 43 interrupts the flow of the gas, the gas pressure difference between the front and the rear of the valve plug 43 disappears, so that the valve plug 43 automatically retreats back to the valve position under the elastic force of the spring 44, and the gas circulation is resumed.

The gas safety shutoff device 10 can be directly connected to the gas pipe (in this case, the joint portion 25 of the body 20 should be set to a thread type like the joint portion 24), or as shown in Fig. 5, The installation object 70 such as a gas valve, a pressure regulating valve, a timing valve, an adjustment accessory for a gas pipeline, or a safety accessory for a gas pipeline is connected to adjust the interruption flow rate with a gas appliance of different energy consumption.

Moreover, the present creation is not limited to the above embodiment, and may be other different types. 6 and 7 are views showing the appearance and cross section of an embodiment of the gas switch 80. The difference between the gas switch 80 disclosed in this embodiment and the gas safety interrupting device 10 is that a valve body 81 is opened between the inflow port 22 and the outflow port 23 of the gas passage 21, and the valve body 81 is opened in the middle. Both sides of the valve body 81 are held by the valve seat 83 to ensure an optimal close state. An operating device (not shown) is connected above, and the valve body 81 can be driven to change the valve position by rotating the knob 84 of the operating device. The flow inlet 22 is connected or disconnected from the outflow port 23, and the gas passage 21 is opened and closed. It is a matter of fact, so further explanation is not necessary. In the embodiment of the drawings, the valve body 81 is spherical, but may also be conical or other shape, and is not limited by the spherical valve body. If a conical valve body is used, the above-mentioned valve seat 83 will no longer be required, and the conical valve body and the gas passage 21 can be mechanically formed to form a gas-tight fit. Since the gas switch 80 is connected between the gas pipe and the gas appliance, the inlet 22 side of the body 21a is also provided with a screw connection portion 24 for connecting the gas pipe, and the outlet port 23 side is configured to be connected. A joint 29 of a gas hose (not shown), the other end of which is connected to a gas appliance (not shown). The connecting portion 24 and the joint 29 may be of other types and are not limited by the embodiment shown in the drawings.

For the sake of simplicity, the gas switch 80 disclosed in the present embodiment and the gas safety interrupting device 10 disclosed in the above embodiments are denoted by the same reference numerals, and the previous descriptions of the above embodiments include the adjustment of the fuel. The method and principle of the gas occlusion flow are also applicable to this embodiment, and will not be described again.

As shown in FIG. 8, when the valve plug 43 of the gas switch 80 acts, that is, when the valve plug 43 is in close contact with the valve seat 32 to block the flow passage 31 (as indicated by a broken line), it is formed at the front end of the valve plug 43. The central projection 53 protrudes in front of the sleeve 30, and then the knob 84 is manually rotated by 90 degrees (as indicated by a broken line); during the rotation of the valve body 81, it can push the projection of the valve plug 43 backward. The portion 53 causes the valve plug 43 to move away from the valve seat 32, and the valve plug 43 automatically returns to the valve position under the elastic force of the spring 44 to resume gas circulation.

Of course, the above description is only a preferred embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation using the contents of the present specification and the drawings may be directly or indirectly applied to Other related technical fields are included in the scope of patent protection of this creation.

20a‧‧‧ Ontology

21‧‧‧ gas passage

22‧‧‧Inlet

23‧‧‧Exit

24‧‧‧Connecting Department

26‧‧‧Assembled holes

28‧‧‧Development

29‧‧‧Connectors

30‧‧‧ sleeve

31‧‧‧Flow path

32‧‧‧ valve seat

33‧‧‧A male thread

34‧‧‧ trench

40‧‧‧Safety valve

41‧‧‧ Shell

42‧‧‧ shaft tube

43‧‧‧ Valve plug

44‧‧‧ Spring

45‧‧‧ bracket

46‧‧‧Long hole

47‧‧‧Racks

48‧‧‧ Department of Management

49‧‧‧ card slot

50‧‧‧Adjustment button

51‧‧‧Knock ring

52‧‧‧Sliding shaft

53‧‧‧Protruding

54‧‧‧ ring neck groove

55‧‧‧Setting screws

56‧‧‧O-ring

57‧‧‧ Gears

58‧‧‧Slots

80‧‧‧ gas switch

81‧‧‧ valve body

82‧‧‧ Holes

83‧‧‧ valve seat

84‧‧‧ knob

Claims (10)

A safety device capable of adjusting a gas shutoff flow, comprising: a body comprising a gas passage having an inlet and an outlet, and an assembly hole communicating with the inlet; a sleeve fixed to the gas a flow inlet of the passage and having a bell-like flow passage, the front end of the flow passage forming a valve seat; a safety valve including a cylindrical outer casing assembled to the flow inlet, the inside of the outer casing having a permission a gas-flowing bracket, the shell wall is provided with a rack facing the assembly hole; the safety valve further comprises a valve plug directly supported in the center of the bracket or indirectly supported by a shaft tube in the central axial sliding of the bracket, and a normal time The spring that forces the valve plug to retreat to keep the flow passage clear, when the pressure on the outlet side is abnormally dropped, the valve plug is forced to advance because the gas pressure difference between the front and rear is greater than the spring force of the spring until the close Blocking the flow passage at the valve seat; and an adjustment knob rotatably mounted to the assembly hole of the body, the bottom portion having a gear meshing with the rack, and rotating the adjustment button to drive the outer casing Relative to Moving the sleeve so that the valve plug of the flow path proceeds to a narrow mouth or wide mouth back to the flow path, and an effect of adjusting the gas flow rate cutoff. The safety device of the gas shut-off flow according to claim 1, wherein the body forms a connecting portion and a joint portion on the inflow side and the outflow side of the gas passage to respectively connect a gas. The pipes are each connected to a gas pipe and a mounting object including, but not limited to, gas valves, pressure regulating valves, timing valves, regulating accessories for gas pipes, and safety accessories for gas pipes. The safety device of the adjustable gas shutoff flow according to claim 1, wherein the shell wall of the outer casing has an elongated hole, and the rack is formed in one of the elongated holes. The gear is inserted into the elongated hole to engage the rack. The safety device for adjusting the gas shutoff flow according to claim 1, wherein the upper portion of the adjusting button comprises a radially recessed ring neck groove, and a positioning screw locked to the body extends into the ring neck groove. The adjusting button is held in the main body to be rotatable, and at least one O-ring assembled on the outer periphery of the lower portion of the adjusting button forms airtight between the adjusting button and the contact surface of the assembling hole. The safety device of the adjustable gas shutoff flow according to claim 1, wherein the body further comprises a mounting hole communicating with the outflow port, and a reset button and a compression spring are assembled in the assembly hole, and the reset button is The compression spring is held in a tensioned state and can be pressure-released, and at least one O-ring assembled on the outer circumference of the return button forms airtightness between the contact surface of the return button and the fitting hole. The safety device for adjusting the flow rate of the gas shutoff according to claim 5, wherein the upper portion of the reset button is provided with a groove, and a positioning screw locked to the body extends into the groove, and the reset button can be pressed The ground is maintained on the body. A gas switch comprising: a body comprising a gas passage having an inlet and an outlet, and an assembly hole communicating with the inlet, wherein a manual operation is performed between the inlet and the outlet a valve body for opening and closing the gas passage; a sleeve fixed to the inflow port of the gas passage and having a flow passage like a bell mouth, the front end of the flow passage forming a valve seat; a safety valve The utility model comprises a cylindrical outer casing assembled to the flow inlet, the inner part of the outer casing has a bracket for allowing gas to flow, and the shell wall is provided with a rack facing the assembly hole; the safety valve further comprises a direct support on the bracket Centrally or indirectly supporting a valve plug axially sliding in the center of the bracket through a shaft tube, and forcing the valve at a time a spring that retreats to keep the flow passage clear, and when the pressure on the outlet side is abnormally lowered, the valve plug is forced to advance because the gas pressure difference between the front and rear sides is greater than the spring force of the spring until it is adhered to the valve Blocking the flow passage; and an adjusting button rotatably mounted to the assembly hole of the body, the bottom portion having a gear meshing with the rack, and rotating the adjusting button to drive the outer casing relative to the The sleeve moves to advance the valve plug to the narrow opening of the flow passage or to retreat to the wide opening of the flow passage, thereby generating an effect of adjusting the gas shutoff flow. The gas switch according to claim 7, wherein the body forms a connecting portion and a joint on the inflow side and the outflow side of the gas passage to respectively connect with a gas pipe and a gas hose. . The gas switch of claim 7, wherein the shell wall of the outer casing has an elongated hole formed in one of the long sides of the elongated hole, the gear is sleeved into the elongated hole and the tooth Strip engagement. The gas switch of claim 7, wherein the upper portion of the adjusting button comprises a ring neck groove recessed in the radial direction, and a positioning screw locked to the body extends into the ring neck groove, and the adjusting button is held by The body is freely rotatable, and at least one O-ring assembled on the outer circumference of the adjusting button forms airtight between the adjusting button and the contact surface of the assembling hole.