TWM567325U - Time limit closing device of gas - Google Patents

Abstract

A gas time-limited closing device comprising a casing and a timer, the timer comprising a movement disposed in the casing, and being connected to the rotating shaft of the movement and held above the casing for smoothly rotating to set a gas-time closing time, or Reverse rotation of the knob without the gas off time. The movement comprises a limiting column, the rotating shaft is provided with a blocking rod, and the outer periphery of the housing has a limiting plate protruding outward, and the inner circumference of the knob is provided with an inwardly protruding baffle. The knob forward/reverse maximum rotation angle stops when the baffle and the stop lever respectively touch the limit plate and the limit post, thereby forming a double limit insurance, preventing the knob from being forced to rotate to the maximum angle, and the damage block is prevented. Rod or limit post. In addition, the bottom of the shaft is supported by steel balls to prevent the shaft from falling and the movement to lose its function.

Description

Gas time limit closing device

This creation is about a gas limited time closing device, especially a gas limited time closing device with double limit insurance.

1 shows the appearance of a mechanical timer 14 comprising a movement 45 and a knob 48, wherein the movement 45 has a shaft 52 and a bracket 54, the shaft 52 is provided with a lever 56, and the bracket 54 is provided with a limit post. 58. The knob 48 is coupled to the rotating shaft 52 for the user to turn the set time off time. The blocking lever 56 and the limiting post 58 constitute a limiting device of the timer 14, which can limit the maximum rotation angle of the knob 48; that is, the maximum rotation angle of the knob 48 stops when the blocking lever 56 touches the limiting post 58.

The known mechanical timer 14 has the advantages of being light, practical and inexpensive, and is therefore widely used in small household appliances such as general household ovens, ovens, electric fans, etc., for setting a limited time off time, that is, within a certain time range. Set the usage time of the home appliance, and set the time to automatically shut down. In addition, the mechanical timepiece 14 is also applied to gas appliances or pipes to close the gas in a limited time. For example, in the name of the applicant, the new domestic patent No. M462346 "Gas Timing Interrupter", No. M473470 "Gas Timing Safety Interrupter", No. M506939 "Gas Furnace with Timed Closing Gas Function", M556313 The "Gas Furnace Timing Device" is a case in which a mechanical timer is applied.

Due to the lightweight relationship of the mechanical timer 14, the bar 56 and the limit post 58 made of ferrous material are only 2 mm and 2.5 mm in diameter, respectively, so the strength is limited. However, since the knobs 48 configured by the timers used in the above electrical products are small, the torque generated by the rotary knobs 48 is relatively small, and there is no problem in the application of the electrical products. However, when the mechanical timepiece 14 is applied to a gas appliance or piping, the outer diameter of the timer knob 48 is relatively higher than that of the above-mentioned electrical appliance for safety, labor saving, ease of operation, or the like. 48 is much larger, so the torque generated by the rotary knob 48 is relatively large. Once the knob 48 is forced to rotate due to rush, tension or other reasons, the lever 56 and the limit post 58 are easily bent and deformed, or even broken, and the limit is lost. Bit function.

On the other hand, as shown in Figs. 2 and 3, the bottom of the chronograph shaft 52 is in a suspended state because there is no support, and once the shaft 52 is subjected to an external force (such as a collision, etc.), it moves downward, resulting in the end of the shaft 52. The turntable 55 and the brake member 46 pivotally connected to the bracket 54 cannot be held in the correct cooperative position, that is, the latch 62 of the brake member 46 cannot be inserted into the notch 57 of the turntable 55 or contact the circumference of the turntable 55, and the movement is made. 45 lost function.

The purpose of the present invention is to solve the above problems, and the object thereof is to provide a gas limited time closing device, which has an auxiliary limiting device, which can cooperate with the existing limit device of the timer to generate a double limit insurance effect, and ensure that the knob is rotated by force. When the maximum angle is reached, the lever and the limit post will not be damaged.

Another object of the present invention is to provide a gas limited time closing device, which has a rotating shaft supporting device, which can prevent the rotating shaft from moving downward when subjected to an external force, thereby preventing the rotating shaft from falling and causing the movement to lose its function.

The gas time-limited closing device of the present invention specifically comprises a casing having a first shell chamber and a second shell chamber, one side of the shell being connected to one side The air inlet connector is connected to the air outlet connector, and the air inlet connector defines an air inlet channel along the axial direction. The air outlet connector defines an air outlet channel along the axial direction, the air inlet channel, the second housing chamber and the air outlet channel. Form a gas path. The gas timing device further includes a timer disposed in the first housing chamber, a time delay valve disposed in the second housing chamber, and a transmission mechanism spanning the first and second housing chambers. The timer includes a movement and a knob. The movement includes a bracket and a rotating shaft. The bracket is provided with a limiting post. The rotating shaft is radially mounted with a blocking lever. The knob is connected to the rotating shaft and is held in the rotating shaft. The upper part of the housing is for human rotation. When the knob is rotated in the forward direction to set the time limit closing time of the time delay valve, or the knob is reversely rotated to point to the time when the time delay valve is in the open position, the timer drives the time delay valve to actuate the valve position through the transmission mechanism, so that The air outlet is unobstructed. When the timer expires (set time expires), or when the knob is turned to point to the time when the time delay valve is in the closed position, the time delay valve returns to the closed position to close the air outlet. The outer circumference of the housing has an outwardly protruding limiting plate, and the inner circumference of the knob is provided with an inwardly protruding baffle, and the forward/reverse maximum rotation angle of the knob is stopped at the same time as the baffle and the blocking rod respectively When touching the limit plate and the limit post.

In another embodiment, the first and second housing chambers are separated by a partition, and a steel ball is flexibly assembled on the partition, and the bottom of the rotating shaft is supported on the steel ball.

In another embodiment, a safety valve may be disposed in the intake passage that automatically occludes the intake passage when the gas flow rate is abnormal.

In another embodiment, a thermal valve may be disposed within the intake passage that automatically occludes the intake passage when the temperature is above a defined temperature.

Compared with the conventional technology, the utility model has the advantages that the limiting plate formed on the outer periphery of the casing and the baffle integrally formed on the inner circumference of the knob form an auxiliary limiting device, and cooperate with the existing limit column and the block of the timer. a basic limit device consisting of a pole, The forward/reverse maximum rotation angle of the knob is stopped when the baffle and the stop lever respectively touch the limit plate and the limit post, thereby generating a double limit insurance effect, so as to avoid when the knob is strongly rotated to the maximum angle Damage the lever and the limit post.

In addition, a steel ball held by the partition plate is supported at the bottom of the rotating shaft to prevent the downward movement of the rotating shaft, thereby preventing the movement from losing its function due to the falling of the rotating shaft.

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 limited time closing device

11‧‧‧Shell

12‧‧‧Intake connector

13‧‧‧Exhaust joint

14‧‧‧Timer

15‧‧‧Transmission mechanism

16‧‧‧Time delay valve

17‧‧‧Safety valve

18‧‧‧Thermal valve

19‧‧‧ steel balls

20‧‧‧Thermal valve seat

21‧‧‧Flange

22‧‧‧Baffle

23‧‧‧First Shell Room

24‧‧‧Second shell

25‧‧‧Shell cover

26‧‧‧ screws

27‧‧‧Seal ring

28‧‧‧Intake side interface

29‧‧‧Outlet side interface

30‧‧‧Departure

31‧‧‧ female thread

32‧‧‧ jack

33‧‧‧Limited board

34‧‧‧Intake tunnel

35‧‧‧Cylinder

36‧‧‧Threading Department

37‧‧‧O-ring

38‧‧‧fasteners

39‧‧‧ annular groove

40‧‧‧ Venting tunnel

41‧‧‧ male thread department

42‧‧‧O-ring

43‧‧‧Safety valve room

44‧‧‧Heat valve room

45‧‧‧ movement

46‧‧‧Brakes

47‧‧‧Indicator

48‧‧‧ knob

49‧‧‧ screws

50‧‧‧column components

51‧‧‧ clockwork

52‧‧‧ shaft

53‧‧‧ Gear System

54‧‧‧ bracket

55‧‧‧ Turntable

56‧‧ ‧bar

57‧‧‧ gap

58‧‧‧Limited column

59‧‧‧Shrap

60‧‧‧Departure

61‧‧‧ pillar

62‧‧‧Carmen

63‧‧‧ arrow

64‧‧‧Baffle

65‧‧‧ shaft

66‧‧‧ rocker arm

67‧‧‧ rocker

68‧‧‧ openings

69‧‧‧Acoustic arm

70‧‧‧ spring seat

71‧‧‧ valve stem

72‧‧‧ valve body

73‧‧‧Compressed spring

74‧‧‧ center hole

75‧‧‧ head

76‧‧‧ pole tail

77‧‧‧Washers

78‧‧‧Safety seat

79‧‧‧ bracket

80‧‧‧Safety valve plug

81‧‧‧Compression spring

82‧‧‧A male thread

83‧‧‧O-ring

84‧‧‧Flow path

85‧‧‧Departure

86‧‧‧ sleeve

87‧‧‧ bracket body

88‧‧‧Slider

89‧‧‧ pole tail

90‧‧‧ bracket

91‧‧‧Hot motion valve plug

92‧‧‧Compression spring

93‧‧‧Low melting point solder

94‧‧‧Bracket body

95‧‧‧ wing

96‧‧‧ hole sets

97‧‧‧ short tube

98‧‧‧ chamber

99‧‧‧ filter

100‧‧‧ screws

Fig. 1 is an external view of a conventional mechanical timer.

Figure 2 is a front elevational view of a conventional mechanical timer showing the situation in which the shaft is lowered to change the position of the dial relative to the brake.

Figure 3 is a left side view of Figure 2.

Figure 4 is an external view of the gas-limited time-closing device of the creation.

Figure 5 is an exploded view of the component of the creation.

Fig. 6 is a cross-sectional view of the axial direction (gas flow direction) of the present invention, showing that the time delay valve, the safety valve and the thermal valve are maintained in the closed valve position, wherein the arrow indicates the gas flow path, the same applies hereinafter.

Fig. 7 is a cross-sectional view taken along line A-A of Fig. 6, showing a state in which the latch of the brake member coincides with the notch of the turntable.

Figure 8 is an axial sectional view of the creation, showing the state in which the time delay valve is actuated to open the valve position.

Figure 9 is a cross-sectional view taken along line B-B of Figure 8, showing the knob swiveling to the maximum At the angle, the bar and the baffle respectively touch the state of the limit post and the limit plate.

Figure 10 is a cross-sectional view of the stop bar and the baffle respectively touching the limit post and the limit plate when the knob is rotated to the maximum angle.

Figure 11 is a cross-sectional view taken along line C-C of Figure 8 showing the actuating arm pushing the safety valve plug that is actuated as a closed valve position rearward.

As shown in the fourth to sixth figures, the gas time limit closing device 10 disclosed in the present invention comprises a casing 11, an air inlet joint 12, an air outlet joint 13, a timer 14, a transmission mechanism 15, and a time delay valve 16. . Wherein: the housing 11 has a substantially cylindrical outer shape, and the bottom portion extends radially outward to form a rounded quadrangular flange 21, and the inner space is vertically separated by a radial partition 22 into a first housing chamber 23 and a second portion. The housing chamber 24, the timer 14 and a part of the transmission mechanism 15 are assembled to the first housing chamber 23, and the delay valve 16 and another portion of the transmission mechanism 15 are disposed in the second housing chamber 24, the second housing chamber 24 The bottom opening is closed by a cover 25 that is locked to the flange 21 by a plurality of screws 26, and is fitted with a seal ring 27 assembled at the bottom of the housing 11 to form a reliable contact between the cover 25 and the contact surface of the housing 11. Airtight, thereby closing the second housing chamber 24 to prevent gas leakage. The housing 11 further includes an intake side interface 28 and an air outlet side interface 29, and the two interfaces 28, 29 are respectively connected to the second housing chamber 24. The air inlet connector 12 and the air outlet connector 13 are respectively connected to The intake side interface 28 and the air outlet side interface 29. The intake side port 28 is a small diameter hole having a small inner diameter and a rear large diameter, and an annular step portion 30 is formed therebetween as a depth basis for the intake port 12 to be fitted into the intake side port 28. The intake side interface 28 further includes a female thread 31 disposed in the small hole section, and a socket 32 perpendicularly intersecting the large hole section. The function of the female thread 31 and the insertion hole 32 is left to be described later. The outlet side interface 29 is a yin Threaded holes (threaded holes).

The intake joint 12 has an intake passage 34 opened in the axial direction, and the outer end is a cylindrical portion 35, and the opposite end is a threaded portion 36 that fits into the intake side interface 28 and ends at the step portion 30, and by the two O-rings 37 assembled on the outer circumference of the cylindrical portion 35, a proper airtightness is generated between the contact faces of the cylindrical portion 35 and the intake side port 28, while the intake joint 12 is used by using a fastener 38. Connected to the housing 11. The fastener 38 is substantially dome-shaped and inserted into the annular groove 39 at the front end of the cylindrical portion 35 via the insertion hole 32. Thus, the air inlet joint 12 is hermetically connected to the casing 11 for connecting the gas pipeline ( Figure not shown) used.

The air outlet joint 13 has an air outlet 40 and a male thread portion 41 which are axially opened. The male thread portion 41 is assembled with an O-ring 42 on the outer side and is screwed to the air outlet side interface 29, so that the air outlet joint 13 is provided. The airtightness is screwed to the casing 11 to connect a rubber hose (not shown), and the other end of the rubber hose is connected to a gas appliance (not shown). The air inlet passage 34, the second housing chamber 24 and the air outlet passage 40 form a gas passage (not numbered), and the gas enters the second housing chamber 24 through the air inlet passage 34, and then flows into the air outlet hole from the second housing chamber 24. The track 40 is then supplied to the gas appliance via a rubber hose.

The timer 14 includes a movement 45, a brake member 46, a dial 47 and a knob 48. The movement 45 is locked to a set of column members 50 of the first housing chamber 23 by a set of screws 49. The movement 45 includes a spring 51, a rotating shaft 52, a gear train 53 composed of a plurality of pairs of gears, and A bracket 54 that supports the above components. The lower end of the rotating shaft 52 has a turntable 55, and the upper end is provided with a blocking rod 56. The circumference of the rotating shaft 55 has a notch 57. The blocking rod 56 cooperates with a limiting post 58 disposed on the bracket 54 to form a timing. The basic limiter of the device 14 limits the maximum angle of rotation of the knob 48. The brake member 46 is pivotally connected to the bracket 54 and cooperates with a resilient piece 59. The elastic piece 59 One end is fixed to the brake member 46, and the opposite free end extends to the rear of one of the brackets 61 of the bracket 54. The brake member 46 further includes a latch 62 extending in the direction of the turntable 55, and the latch 62 is normally inserted into the notch 57 of the turntable 55. (Fig. 7), when the turntable 55 rotates with the rotary shaft 52, the turntable 55 will swing the push brake member 46 outward, causing the click 62 to exit the notch 57 and come into contact with the circumference of the turntable 55 (Figs. 9 and 10), while the shrapnel The free end of the 59 abuts against the post 61, so that the elastic piece 59 stores elastic energy, whereby the elastic force maintains the brake member 46 in a tensioned state, and when the turntable 55 is rotated to the position, the pinch 62 is automatically inserted into the notch 57. source. The indicator disc 47 is circular and assembled on the upper end of the casing 11. The surface of the disc is marked with on, off, full-time on, and the number and scale (not shown) indicating time. The knob 48 is made of a transparent plastic material and is connected to the upper end of the rotating shaft 52 and rotated around the indicating plate 47 for manually setting the time limit closing time and the valve position of the time delay valve 16. The knob 48 includes an arrow 63 formed on the upper surface and a baffle 64 projecting inwardly from the inner circumference, the arrow 63 being used in conjunction with the indicator disc 47 to indicate time and valve position. The baffle 64 and the limiting plate 33 protruding outward from the outer periphery of the casing 11 constitute an auxiliary limiting device, so that the forward/reverse maximum rotation angle of the knob 48 is stopped at the same time as the baffle 64 and the bar 56 simultaneously When the limit plate 33 and the limit post 58 are touched (Figs. 9 and 10). By turning the knob 48 in the forward direction, the gas limit time can be set within a certain time range. When the reverse rotation knob 48 to arrow 63 is directed to the "all-day" position on the dial 47 (Fig. 10), the time-delay valve 16 can be maintained in the normally open position, at which time the timer 14 has no timing function.

In a preferred embodiment, a steel ball 19 can be flexibly assembled on the partition 22, whereby the steel ball 19 causes a supporting effect at the bottom of the rotating shaft 52, preventing the rotating shaft 52 from moving downward when subjected to an external force, avoiding the movement 45 due to the rotating shaft 52. Falling and losing functionality.

The transmission mechanism 15 is disposed in the housing 11 and is swung by the brake member 46 to transmit a linear motion to the time delay valve 16. The transmission mechanism 15 includes a shaft 65, A rocker arm 66 and a rocker 67 are permeable to the partition 22 of the housing 11 in a gas-tight manner, and the two ends are held in the first housing chamber 23 and the second housing chamber 24, respectively. One end of the rocker arm 66 is locked to the upper end of the shaft 65 by a screw (not numbered), and the other end is in contact with the brake member 46, so that the rocker arm 66 can be pushed by the brake member 46 to swing outward. One end of the rocker 67 is locked to the lower end of the shaft 65 by a screw (not numbered), and an opposite end has an opening 68 for connecting the time delay valve 16; the rocker 67 further includes an actuating arm 69 which intersects the shaft and is V-shaped. The role is left to be described later.

The time delay valve 16 is disposed in the second housing chamber 24 for opening and closing the gas passage. The time delay valve 16 is composed of a spring seat 70, a valve stem 71, a valve body 72 and a compression spring 73. The spring seat 70 is a hollow body extending downward from the partition 22 to support the valve stem 71 and compress. Spring 73. The valve stem 71 slidably passes through the central bore 74 of the spring seat 70 and has a head 75 and a tail 76 at opposite ends, the diameter of the head 75 being greater than the width of the rocker opening 68 while remaining The inner side of the shaft 67 of the rod 67 can push the head 75 to retreat the valve rod 71 when the rocker 67 swings; otherwise, the rocker can be pushed by the head 75 when the valve stem 71 advances due to the elastic force of the compression spring 73 67 reverse swing. The valve body 72 is mounted on the tail 76 with a washer 77 to actuate the valve opening position and the return valve position with the advancement and retreat of the valve stem 71 to achieve the opening and closing of the gas passage. The compression spring 73 is sleeved on the outer circumference of the valve stem 71, and the two ends are respectively held by the spring seat 70 and the washer 77 to be tensioned, so that the valve body 72 is normally kept in the closed valve of the clogging air outlet 40 by its elastic force. Bit.

As shown in Figs. 6 and 7, when the timer 14 is at rest, the latch 62 of the stopper 46 is fitted into the notch 57 of the turntable 56, and at this time, the valve body 72 is held at the closed position to close the air outlet 40.

As shown in Figures 8 and 9, when turning the knob 48 to arrow 63 in the direction The "on" position on the indicator disk 47 (the ninth figure is rotated by the knob 48 to the maximum angle, so that the baffle 64 and the bar 56 simultaneously touch the limit plate 33 and the limit post 58 respectively), setting When the gas is closed for a limited time, the rotating shaft 52 will rotate with the knob 48, and the spring 51 with the inner core of the motive core 45 is crimped to reserve elastic energy. When the energy is slowly released, the rotating motion can be conveyed for a certain period of time. The timing of the gear train 53 is achieved; at the same time, the notch 57 of the turntable 56 rotates with the rotary shaft 52 and no longer engages with the latch 62, so that the turntable 56 is changed to the circumference of the turntable 62 to contact the click 62, and When the two touch, the brake member 46 is deflected outwardly, so that the rocker arm 66 connected by the lever shaft 65 and the rocker 67 generate the same swing, and then the linear motion of the rocker 67 from the rocking motion of the rocker 67 to the valve stem 71 is caused. The valve body 72 coupled to the valve stem 71 is displaced away from the air outlet joint 13 to open the air outlet passage 40, allowing gas to be supplied to the gas appliance via a rubber hose connected to the outflow gas joint 13. When the valve stem 71 retreats, the compression spring 73 is simultaneously compressed to accumulate elastic energy.

When the timer 14 is finished (set time), the notch 57 of the turntable 56 will face the click 62 with the rotation of the turntable 56, so that the force of the turntable 56 applied to the time delay valve 16 through the transmission mechanism 15 disappears, so that the compression spring 73 can release the elastic energy, push the transmission mechanism 15 back to the original position, so that the cassette 62 is automatically inserted into the notch 57 of the turntable 56, and the valve body 72 also closes to the air outlet joint 13 as the rocker 67 returns to the original position, and is closed. The air channel 40 automatically blocks the gas and closes the fire to achieve energy saving and safety.

As shown in Fig. 10, when the knob 48 to the arrow 63 are reversely turned to the "all-on" position on the dial 47 (this figure is rotated counterclockwise to the maximum angle by the knob 48, so that the shutter 64 and the lever 56 are simultaneously The limit plate 33 and the limit post 58 are respectively touched, and the timer 14 will drive the time delay valve 16 to retreat through the transmission mechanism 15, so that the air outlet 40 is kept clear, and the shaft 52 is not retracted when the knob 52 is reversed. The function of the bar 51, so the timer 14 does not have the function of closing the time limit valve 16 in the "all day open" position. can. When the knob arrow 63 points to the "on" or "all-on" position on the dial 47, turning the knob 48 to the "off" position forces the valve body 72 to return to the closed position and closes the air outlet 40.

In the preferred embodiment, as shown in Figures 5 and 6, a safety valve 17 can be provided in the safety valve chamber 43 formed in the front section of the intake passage 34. The safety valve 17 includes a safety valve seat 78, a bracket 79, a safety valve plug 80 and a compression spring 81. The safety valve seat 78 is cylindrical, and the male screw 82 passing through the front end thereof is assembled with the female screw 31 of the inflow side port 28 to be assembled in the safety valve chamber 43 until it abuts against the step portion 30 and passes through an O-ring 83. A reliable airtightness is formed between the contact surface of the safety valve seat 78 and the safety valve chamber 43. The safety valve seat 78 has a flow passage 84 having a small inner diameter and a large rear portion. The flow passage 84 forms an annular step portion 85 at its boundary due to the difference in inner diameter. The bracket 79 includes a sleeve 86 and a bracket body 87. The sleeve 86 is sleeved into the rear portion of the flow passage 84 by interference fit until the front end thereof abuts against the step portion 85. The bracket body 87 is integrally formed on the sleeve. The rear of 86. The safety valve plug 80 has an outer shape substantially in the shape of an umbrella, and has a sliding rod 88 axially slidable through the center of the bracket body 87. The rear end of the sliding rod 88 has a tail end having an outer diameter larger than the diameter of the rod. 89 to support the compression spring 81. The compression spring 81 is assembled on the slide bar 88, and the two ends are respectively abutted against the bracket body 87 and the tail 89 to maintain the safety valve plug 80 in the open position by its elastic force.

As shown in Fig. 6, when the gas appliance is in the normal use state, the difference in the gas pressure between the front and the rear of the safety plug 80 is smaller than the elastic force of the compression spring 81. Therefore, the safety valve plug 80 is urged rearward by the elastic force, so that the flow passage 84 of the safety valve seat 78 is kept open, so that the gas enters the flow passage 84 through the gap of the bracket body 87 to the second housing chamber 24, and then from the second After the shell chamber 24 enters the air outlet passage 40, it is supplied to the gas appliance via a rubber hose.

As shown in Fig. 11, when an abnormal situation such as a rubber hose is broken or the front end thereof is detached by the gas appliance, the difference in the gas pressure between the front and the rear of the safety plug 80 is larger than the elastic force of the compression spring 81, so that the safety valve is provided. The plug 80 can be advanced by the pressure to be in close contact with the step portion 85, occluding the flow passage 84, and stopping the supply of air to avoid causing a gas explosion.

When the safety valve plug 80 is actuated, the rotary knob 48 to the arrow 63 are manually pointed to the "OFF" position of the dial 47, so that the valve body 72 of the time delay valve 16 is actuated to close the valve position, occluding the gas passage, and indeed blocking the gas.

After the abnormal condition described above is removed, the knob 48 to arrow 63 are turned to point to the "on" or "all-day" position on the dial 47 to push the safety valve plug 80 back through the actuating arm 69 of the rocker 67, and the gas path is reversed. When it has been blocked, the gas pressure difference between the front and the rear of the safety plug 80 disappears, so that the safety valve plug 80 can be retracted by the elastic force of the compression spring 81 to return to the valve position, and the gas circulation can be restored.

Further, the present creation can also provide a thermal valve 18 in the thermal valve chamber 44 formed in the rear stage of the intake passage 34 as shown in Figs. The heat-operated valve chamber 44 is a small-diameter hole having a small inner diameter and a large rear portion, and an annular step portion 60 is formed therebetween. The thermal valve 18 includes a bracket 90, a thermal valve plug 91, a compression spring 92 and a low melting point solder 93. The bracket 90 includes a cylindrical bracket body 94 and the bracket body 94. a plurality of fins 95 radiating outwardly from the periphery, the bracket 90 exerting an interference fit with the inner wall of the thermodynamic valve chamber 44 through the outer edge of the vane 95 on the one hand, and the step edge of the fin 95 against the step on the other hand The portion 60 is fixed to the heat-operated valve chamber 44. The bracket body 94 is generally cylindrical and has a set of holes 96 therein for receiving a portion of the thermal valve plug 91 and a portion of the compression spring 92. The thermal valve plug 91 is welded to the front of the bracket 90 with a low melting point solder 93, and is normally held at the valve opening position away from the thermodynamic valve seat 20. The low melting point solder 93 is made of a tin-based alloy which is meltable at a temperature of 80 and 100 °C. Thermal valve seat 20 is an annular step formed between the safety valve chamber 33 and the thermal valve chamber 43. The thermodynamic valve plug 91 further includes a short tube 97 extending axially rearwardly and nesting into the sleeve hole 96 for axially sliding. The inner tube wall of the short tube 97 defines a chamber 98 for receiving the safety valve. The rear portion of the slider 88 and the tail 89 of the plug 80 contribute to shortening the length of the intake joint 12. The rear portion of the compression spring 93 is sleeved into the sleeve hole 96 of the bracket body 94. The front portion surrounds the outer tube wall of the short tube 97, and the two ends are respectively supported by the bracket body 94 and the thermal valve plug 91 to be tensioned. Reserve elastic energy.

When the gas-limited time-closing device 10 is heated due to a fire or the like, the heat of the air inlet joint 12 can be quickly transmitted to the low-melting-point solder 93 through the heat conduction effect; when the temperature of the low-melting-point solder 93 is melted above its melting point, The function of the fixed thermal valve plug 91 is lost, so that the thermal valve plug 91 advances by the elastic force of the compression spring 92, and is slidably engaged with the sleeve hole 96 on the way out of the bracket body 94 to be thermally activated. The valve plug 91 is intimately adhered to the thermal valve seat 20, and at the same time, airtightness is formed between the contact faces of the two, and the intake port 34 is closed to block the gas and prevent the disaster from expanding.

Since the safety valve 17 includes an elongated compression spring 81, the gas supplied to the gas appliance through the gas delivery line usually contains solid impurities. Rust, dust, etc. in the gas transmission line are the main sources of contamination of solid impurities. If these contaminants are not removed in advance, the result of the accumulation of the compression spring 81 will cause the spring to lose its effect, and the safety valve plug 80 will not operate normally. Therefore, in a preferred embodiment, as shown in Figures 5 and 6, the creation also includes a screen 99 which is rounded in a stainless steel mesh and locked in a thermostat with a screw 100. The carrier body 94 of the 18 is thereby filtered to remove solid impurities flowing in with the gas, and these contaminants are prevented from accumulating on the compression spring 81 of the safety valve 17, ensuring that the safety valve plug 80 can operate normally.

Of course, the above embodiments can be applied without departing from the scope of the present creation. All of the matters contained in the above description and the drawings are to be considered as illustrative and not to limit the scope of the invention.

Claims (4)

A gas limited time closing device comprises a casing having a first shell chamber and a second shell chamber, one side of the shell being connected to an air inlet joint and the other side being connected to an air outlet joint, the air inlet An air inlet channel is defined in the axial direction of the joint, the air outlet joint defines an air outlet channel in the axial direction, the air inlet channel, the second shell chamber and the air outlet channel form a gas passage; the gas timing device further comprises a a first chamber chamber timer, a time delay valve disposed in the second housing chamber, and a transmission mechanism spanning the first and second housing chambers; the timer includes a movement and a knob, the movement including a bracket and a rotating shaft, the bracket is provided with a limiting post on the upper side thereof, the rotating shaft is provided with a blocking rod in the radial direction, the knob is connected to the rotating shaft and is held above the housing for artificial rotation; when rotating in the forward direction The knob sets the time limit closing time of the time delay valve, or when the knob is reversely rotated to point to the time when the time delay valve is in the open position, the timer drives the time delay valve to actuate the valve position through the transmission mechanism, so that the air outlet channel is unblocked When the timer expires (set When the time is up, or when the knob is turned to point to the time when the time delay valve is in the closed position, the time delay valve returns to the closed position to block the air outlet; wherein the outer circumference of the housing has an outwardly protruding limit The inner circumference of the knob is provided with an inwardly protruding baffle, and the forward/reverse maximum rotation angle of the knob is stopped when the baffle and the baffle respectively touch the limit plate and the limit post. The gas time-limited closing device of claim 1, wherein the first shell chamber and the second shell chamber are separated by a partition, and a steel ball is assembled on the partition, and a bottom of the rotating shaft is supported on the steel ball. The gas time limit closing device of claim 1, further comprising a safety valve disposed in the intake passage, the safety valve automatically closing the intake passage when the gas flow rate is abnormal. The gas time limit closing device of claim 1, further comprising a thermal valve disposed in the intake passage, the hot valve automatically occluding the intake passage when the temperature is higher than a limit temperature.