CN216618676U - Pipeline gas self-closing device - Google Patents

Abstract

A pipeline gas self-closing device comprises a device body, wherein the device body is provided with a gas passage, a pressure receiving chamber and an assembling hole which are adjacent, the gas passage is provided with an automatic valve, the opposite side of the pressure receiving chamber is provided with a control mechanism, and the assembling hole is provided with a resetting mechanism extending out of the device body. When the gas pressure is in the preset pressure range, the automatic valve is kept in the valve opening position through the control mechanism, so that the gas passage is kept in a smooth state. When the gas pressure is lower than or higher than the preset pressure, the control mechanism releases the automatic valve to close the automatic valve to block the gas passage, and simultaneously, the automatic valve and the control mechanism are mutually locked and abutted to the resetting mechanism. After the gas pressure is confirmed to be recovered to be normal, the resetting mechanism is manually operated, the automatic valve is reset to the open valve position, and the gas circulation is recovered.

Description

Pipeline gas self-closing device

Technical Field

The utility model relates to a pipeline gas self-closing device, in particular to a safety device which can automatically close gas when the gas supply pressure is lower than or exceeds the preset pressure and can be manually opened after being closed.

Background

In order to ensure the safe use of gas, a gas self-closing device for a pipeline, which is called a self-closing valve for short, is developed. The self-closing valve is installed on an indoor gas pipeline and has the functions of high-pressure automatic closing, low-pressure automatic closing, overcurrent automatic closing, no external power during closing and manual opening after closing.

The self-closing valves disclosed in chinese patent publication nos. CN110792814A and CN112212042A and utility model patent publication No. CN213088808U have different technical problems to be solved, so the technical solutions for solving the technical problems are different.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a gas self-closing device for a pipeline, which is novel in structure, safe and reliable.

The utility model also aims to provide a pipeline gas self-closing device which can give visual warning signals of the gas pressure state to a user.

The utility model particularly relates to a pipeline gas self-closing device which comprises a device body, an automatic valve, a control mechanism and a resetting mechanism. The device body is provided with a gas passage, a pressure receiving chamber and an assembling hole which are adjacent, and a valve seat is formed on the gas passage. The automatic valve includes one support locked in the joint between the gas passage and the assembling hole, one sliding valve rod supported on the support, one valve plug connected to the valve rod, and one valve spring to maintain the valve rod and the valve plug in tension state. The control mechanism comprises a diaphragm for closing the opening of the compression chamber, a sliding sleeve connected with one side of the diaphragm and kept sliding in the assembling hole, a balance cylinder connected with the other side of the diaphragm, a shell cover locked on the device body and clamping the periphery of the diaphragm together with the device body, and a low-pressure spring and a high-pressure spring arranged between the balance cylinder and the shell cover, wherein the sliding sleeve is provided with a sleeve hole and an opening facing the club head and connected with the sleeve hole, two side walls of the opening are respectively provided with a stop, a first channel is defined above the two stops, and a second channel is formed below the two stops. The resetting mechanism comprises a resetting rod which is kept in the sleeve hole of the sliding sleeve to slide and extends out of the device body, a resetting button which is connected with the resetting rod, and a resetting spring which enables the resetting button and the resetting rod to automatically reset, wherein the resetting rod is provided with a bevel groove which is concavely arranged along the radial direction. When the gas pressure is in the range of the low-pressure spring force and the high-pressure spring force, the two pulleys respectively abut against the two backstops to keep the valve plug at a position away from the valve seat, so that the gas passage is in a smooth state. When the gas pressure is lower than the low-pressure spring force, the rod head and the two pulleys enter the bevel groove of the resetting rod from the second channel, so that the valve plug is tightly engaged with the valve seat to block the gas passage. When the gas pressure is higher than the high-pressure spring force, the rod head and the two pulleys enter the bevel groove of the resetting rod from the first channel, so that the valve plug is tightly combined with the valve seat to block the gas passage. When the gas pressure is confirmed to be restored to the normal range, the return button is manually operated, the rod head and the two pulleys exit the sliding sleeve from the first or second channel under the cooperation of the bevel groove and the abutting part, so that the two pulleys are abutted against the two stop blocks again, the valve plug is kept at the valve opening position, and the gas circulation is restored.

The assembling hole is a reducing hole, and a shoulder part is formed at the joint of the large hole section and the small hole section; the device body comprises an annular groove concentric with the small hole section of the assembly hole; the sliding sleeve keeps sliding in the large hole section of the assembling hole; the lower rod body of the resetting rod is flexibly inserted into the sleeve hole of the sliding sleeve, the bevel groove is formed in the lower rod body, the upper rod body of the resetting rod extends out of the device body from the small hole section of the assembling hole to be connected with the resetting button, a rod shoulder is formed between the upper rod body and the lower rod body of the resetting rod, and the upper dead point of the resetting rod is stopped at the position where the rod shoulder contacts the shoulder; the return spring is arranged in the annular groove and compressed into a tensioning state by the return button, and elastic energy for automatically returning the return button and the return rod to the original position is reserved.

In another embodiment, the assembling hole is a reducing hole, and a shoulder is formed at the joint of the large hole section and the small hole section; the sliding sleeve keeps sliding in the large hole section of the assembling hole; the lower rod body of the resetting rod is flexibly inserted into the sleeve hole of the sliding sleeve, the bevel groove is formed in the lower rod body, the upper rod body of the resetting rod extends out of the device body from the small hole section of the assembling hole to be connected with the resetting button, a rod shoulder is formed between the upper rod body and the lower rod body of the resetting rod, and the upper dead point of the resetting rod is stopped at the position where the rod shoulder contacts the shoulder; the return spring is arranged at the large hole section of the assembly hole, two ends of the return spring respectively prop against the shoulder and the rod shoulder to be in a tensioning state, and elastic energy for automatically returning the return button and the return rod to the original position is reserved.

The support comprises a support bottom, a first rod support and a second rod support, wherein the first rod support and the second rod support respectively extend upwards from two sides of the support bottom, the first rod support is embedded into a clamping groove formed in the device body for positioning, the support bottom is locked on the device body through two screws, the first rod support is provided with a rod hole, the second rod support is provided with a rod groove, a rod body of the valve rod penetrates through the rod hole, and the rod head is supported in the rod groove so that the valve rod can freely slide on the support.

The lateral wall of cap is equipped with a window at least, and the periphery of this balanced section of thick bamboo has red color ring, green color ring, the white color ring that indicates gas pressure respectively and surpasss preset pressure, be in normal pressure scope, be less than preset pressure, and this color ring that corresponds this pressure state will be along with the removal of this balanced section of thick bamboo and flush with this window.

The pipeline gas self-closing device further comprises a rotary valve for manually opening and closing the gas passage, and a safety valve for automatically shutting off the gas passage when the gas flow exceeds a preset value.

The gas passage is defined by the rotary valve, one side of the gas flowing to the rotary valve is the inflow side of the gas passage, one side of the gas flowing out from the rotary valve is the outflow side of the gas passage, the automatic valve and the safety valve are arranged on the inflow side of the gas passage, the safety valve is arranged on the downstream of the automatic valve, or the automatic valve is arranged on the outflow side of the gas passage, and the safety valve is assembled on the inflow side of the gas passage.

The inlet of the gas passage has a joint part formed by internal threads or external threads, and the outlet of the gas passage is provided with a hose connector or a threaded connector.

The inner side of the inflow port of the fuel gas passage is provided with a filter, and the hose joint or the threaded joint of the outflow port is a single body and is connected to the device body, or the hose joint or the threaded joint is directly processed and formed on the device body.

The shell cover is internally provided with a central column, and the central column is provided with a screw hole with an opening positioned at the bottom of the shell cover for a screw to lock a seat board at the bottom of the shell cover.

The utility model has the effect that the gas channel can be kept smooth when the gas supply pressure is in the normal range under the cooperative action of the automatic valve, the control mechanism and the resetting mechanism. When the gas supply pressure is lower than or higher than the preset pressure, the gas passage is immediately cut off, and the closing action is rapid and reliable. After the gas supply pressure is confirmed to be recovered to be normal, the gas circulation can be recovered through the resetting mechanism, and the operation is simple and convenient.

Moreover, the periphery of the balance cylinder along with the movement of the diaphragm is provided with red, green and white color rings for indicating the gas pressure state, and a user can confirm that the gas supply pressure is normal and is in a circulation state, a low-pressure blocking state or a high-pressure closing state through a window of the shell cover.

In addition, the resetting mechanism has interchangeability, can be configured with a resetting mechanism which can be pressed and released for automatic resetting, can also be assembled and pulled to perform the function of manual opening after closing, and meets the diversified requirements of the market.

The details as to the present invention, together with other objects and features thereof, will be best understood from the following description of embodiments when read in connection with the accompanying drawings.

Drawings

FIG. 1 is a perspective view of the gas self-closing device for pipeline of the present invention.

FIG. 2 is an exploded perspective view of the gas self-closing device for pipeline, wherein the detailed structures of the rotary valve and the safety valve are omitted.

Fig. 3 is an axial (gas flow direction, as indicated by an arrow, the same shall apply hereinafter) sectional view of the gas self-closing device for a pipeline, showing a state where the gas supply pressure is in a preset pressure range, the automatic valve is opened and the gas is normally circulated.

Fig. 4 is a partially enlarged perspective view of fig. 3, showing a state that two pulleys of the valve rod respectively abut against two stoppers of the sliding sleeve, so that the valve plug is kept in an open position.

FIG. 5 is an axial sectional view of the gas self-closing device for pipeline, showing the state that the automatic valve is closed when the gas supply pressure is lower than the preset pressure.

FIG. 6 is a partially enlarged perspective view of FIG. 5, showing the rod head and two pulleys entering the bevel groove of the return rod through the second passage of the sliding sleeve.

FIG. 7 is an axial sectional view of the gas self-closing device for pipeline, showing the state that the automatic valve is closed when the gas supply pressure exceeds the preset pressure.

FIG. 8 is a partially enlarged perspective view of FIG. 7, showing the rod head and two pulleys entering the bevel groove of the return rod through the first passage of the sliding sleeve.

FIG. 9 is an axial section view of the pipeline gas self-closing device equipped with the pull-release return mechanism.

FIG. 10 is an axial sectional view similar to FIG. 3 of the gas self-closing device for piping, showing the automatic valve disposed on the outflow side of the gas passage.

FIG. 11 is an axial cross-sectional view similar to FIG. 9 of the gas self-closing device for a pipeline, showing the automatic valve disposed on the outflow side of the gas passage.

FIG. 12 is an axial cross-sectional view of the pipeline gas self-closing device with the rotary valve and the safety valve omitted.

Detailed Description

As shown in fig. 1 to 4, the gas pipeline self-closing device 10 disclosed by the present invention comprises a device body 11, an automatic valve 12, a control mechanism 13 and a reset mechanism 14. Wherein:

the apparatus body 11 houses the automatic valve 12, the control mechanism 13, the return mechanism 14, and other components. The device body 11 is provided with a gas passage 20, and the inflow port of the gas passage 20 is provided with a joint part 21 consisting of internal threads or external threads for connecting a gas pipe; the outlet port has a hose connector 22 for connecting a rubber hose (none of which are shown) extending from a gas appliance. In the embodiment of the drawings, the hose coupler 22 is a single body and is connected to the device body 11 using a screw thread. The device body 11 has a pressure receiving chamber 23 at a lower portion thereof and a fitting hole 24 at an upper portion thereof, and the pressure receiving chamber 23 is located on the same center axis as the fitting hole 24 and vertically adjacent to the gas passage 20. The assembly hole 24 is a reducing hole with a small upper inner diameter and a large lower inner diameter, and a shoulder 25 is formed at the joint of the large hole section and the small hole section; the body 11 is provided with an annular groove 26 concentric with the small hole section of the mounting hole 24, and the shoulder 25 and the annular groove 26 function as described below and are skipped. It should be noted that in the description of the present invention, the directions of up, down, left, and right are based on fig. 3 as a reference.

The automatic valve 12 is disposed in the gas passage 20 to automatically shut off the gas passage 20 in response to a change in gas pressure. The automatic valve 12 is composed of a support 33, a valve stem 34, a valve plug 35, and a valve spring 36. The bracket 33 includes a frame bottom 37, and a first support 38 and a second support 39 respectively extending upward from opposite sides of the frame bottom 37, the frame bottom 37 has two screw holes 40, the first support 38 has a rod hole 41, and the second support 39 has a rod slot 42 with an upward opening. The bracket 33 is locked by two screws 43 at the abutment of the gas passage 20 and the fitting hole 24 after the first rod support 38 is inserted into a locking groove 27 of the device body 11 for positioning, so as to support the valve rod 34 to slide stably. The two screws 43 are screwed into the two screw holes 28 of the device body 11 from the two screw holes 40 of the frame bottom 37, respectively. The valve stem 34 includes a stem 44 and a head 45, the stem 44 is inserted through the stem hole 41, and the head 45 is supported on the stem groove 42, so that the valve stem 34 is held by the holder 33 to be axially slidable. The rod head 45 is generally rectangular, a smooth abutting portion 46 is formed at the front end thereof, a pulley 47 is mounted on each of the two sides, and the abutting portion 46 and the pulley 47 function as described later. The valve plug 35 is connected to a valve stem 34 at the opposite end of the stem head 45, and comes into contact with or separates from the valve seat 29 with the sliding of the valve stem 34, thereby opening and closing the gas passage 20. The valve seat 29 is located on the inflow side of the gas passage 20 and is formed by the difference in the diameter of the gas passage 20. The valve plug 35 is sleeved with a valve plug ring 48, so that when the valve plug 35 contacts the valve seat 29, a reliable air-tight seal is formed between the contact surfaces of the valve plug and the valve seat, and gas leakage is prevented. The valve spring 36 is installed at one side of the valve plug 35 with one end abutting against the valve plug 35 and the opposite end supported in a tensioned state by a filter 17 to accumulate elastic energy for pushing the valve stem 34 and the valve plug 35 forward. The filter 17 is detachably screwed into the inner side of the inflow port of the gas passage 20 to filter particulate impurities in the gas pipe and the gas.

The control mechanism 13 is assembled on the opposite side of the pressure receiving chamber 23, and opens/closes the automatic valve 12 in response to a change in the supply air pressure. The control mechanism 13 includes a diaphragm 50, a sliding sleeve 51, a balance cylinder 52, a housing cover 53, a low pressure spring 54 and a high pressure spring 55. The diaphragm 50 is elastically mounted at the opening of the pressure receiving chamber 23, and receives gas pressure at the upper side and low pressure spring 54 and high pressure spring 55 at the lower side. The sliding sleeve 51 is kept sliding in the large hole section of the assembly hole 24 of the device body 11, the lower end of the sliding sleeve is contracted along the radial direction to form a connecting part 56, after the connecting part 56 passes through the diaphragm 50 and the balance cylinder 52, a screw 57 with a gasket is screwed into the connecting part 56 from the lower part of the balance cylinder 52, and thus the diaphragm 50, the sliding sleeve 51 and the balance cylinder 52 are connected with each other to achieve the effect of synchronous displacement. The sliding sleeve 51 includes a sleeve hole 58 opened along the central axis thereof, and a flat 59 is provided on a side of the sliding sleeve 51 facing the valve stem 34, an elongated opening 60 connected to the sleeve hole 58 is provided on the flat 59, two side walls of the opening 60 are respectively provided with a stop 61, a first channel 62 is defined above the two stops 61, and a second channel 63 is formed below the two stops 61. The balance cylinder 52 is coupled below the diaphragm 50 to help the diaphragm 50 move smoothly. The balance cylinder 52 has a concentric ring 64 inside to accommodate the screw 57 and the high pressure spring 55; a red color ring 65, a green color ring 66 and a white color ring 67 are sequentially arranged on the periphery of the balance cylinder 52 from top to bottom, wherein the red color ring 65 indicates that the gas pressure is higher than the preset pressure; the green color circle 66 indicates that the gas pressure is within a preset pressure range; the white color circle 67 represents gas pressure below the preset pressure. Of course, other color rings can be used to represent the gas pressure state, without being limited by the above colors. The cover 53 is fastened to the apparatus body 11 by a set of screws 68, and the periphery of the diaphragm 50 is held between the cover 53 and the apparatus body 11 to close the opening of the pressure receiving chamber 23. The cover 53 includes a sleeve 69 and a center post 70 extending upwardly from the bottom thereof, and two windows 71 formed in the side walls in a confronting relationship, the balance cylinder 52 being fitted around the outer periphery of the sleeve 69, the windows 71 being adapted to receive transparent windows 72 for allowing a user to view the gas pressure state through the windows 72. The low-pressure spring 54 has an inner diameter larger than an outer diameter of the high-pressure spring 55, and the former has a strength (spring force) smaller than that of the latter. The low-pressure spring 54 is housed in a sleeve 69, the two ends of which respectively abut against the top wall of the balance cylinder 52 and the bottom wall of the housing cover 53. The lower body of the high pressure spring 55 surrounds the center post 70 and the upper body fits into the concentric ring 64 of the balance cylinder 52 with its two ends abutting against the washer of the screw 57 and the bottom of the center post 70, respectively. The low-pressure spring 54 and the high-pressure spring 55 apply spring forces of a preset pressure range to the diaphragm 50 toward the pressure receiving chamber 23.

In the preferred embodiment, the center post 70 of the housing 53 is further provided with a screw hole 73 that opens at the bottom of the housing 53 for a screw 74 to lock a seat plate 18 to the bottom of the housing 53, so that the pipe gas self-closing device 10 can be locked to a wall or other suitable object via the seat plate 18 for fixing.

And a return mechanism 14 disposed directly above the control mechanism 13 and having the same center axis, and manually opened after the automatic valve 12 is closed to return the gas flow. The return mechanism 14 includes a return lever 75, a return spring 76, and a return button 77. The lower shaft of the return lever 75 is inserted into the sleeve hole 58 of the sliding sleeve 51 to slide; the outer diameter of the upper shaft is smaller than that of the lower shaft, and the device body 11 is extended from the small hole section of the fitting hole 24 for connecting the return button 77, and an O-ring 89 mounted on the outer periphery of the upper shaft is used to produce an airtight sliding effect with the small hole section of the fitting hole 24. The lower shank of the reset lever 75 also has a radially recessed bezel slot 78, the bezel slot 78 being bell-mouthed, decreasing in width from the outside to the inside and having an inclination for cooperating with the abutment 46 of the valve stem 34 to convert the vertical movement of the reset lever 75 into a horizontal movement of the valve stem 34, the details of which will be described later. A shoulder 79 is formed between the upper and lower shafts of the return lever 75, and when the shoulder 79 contacts the shoulder 25 of the fitting hole 24, the top dead center of the return lever 75 is defined. The lower body of the return spring 76 is fitted into the annular groove 26 of the device body 11. The return button 77 covers the upper body of the return spring 76 and is locked to the return lever 75 by a screw 80, and at the same time, the return spring 76 is compressed to store elastic energy for returning the return lever 75 and the return button 77 to their original positions.

As shown in fig. 3 and 4, the diaphragm 50 is pressurized by gas above and by a low pressure spring 54 and a high pressure spring 55 below. When the gas pressure is in the range between the force of the low-pressure spring 54 and the force of the high-pressure spring 55, the pressure applied to both sides of the diaphragm 50 is equivalent, and the sliding sleeve 51 connected to the diaphragm 50 can be kept in a balanced position, so that the sliding sleeve 51 is stationary, and at this time, the two pulleys 47 of the automatic valve 12 and the two stoppers 61 of the sliding sleeve 51 are in the same horizontal position, and under the action of the valve spring 36, the two pulleys 47 are respectively abutted against the two stoppers 61, so as to keep the valve plug 35 in a position away from the valve seat 29 (i.e., the valve plug 35 is in the open position), so that the gas passage 20 is kept open and the gas is allowed to flow.

Even if the gas pressure is increased or decreased during the use of the gas appliance, the two pulleys 47 can be kept in contact with the two stoppers 61 and the valve plug 35 can be kept in the open position because the longitudinal movement of the sliding sleeve 51 is very small within the range of the spring force. When the sliding sleeve 51 slightly moves due to the variation of the gas pressure in the normal range, the two pulleys 47 abutting against the two stoppers 61 rotate along with the gas pressure, so that the sliding sleeve 51 can freely slide up and down due to the reduced friction.

When the diaphragm 50 is kept in balance, the balance cylinder 52 connected below the diaphragm 50 is also kept still, and the green color ring 66 in the middle of the balance cylinder 52 is flush with the window 72 of the housing cover 53, so that the user can confirm that the gas pressure is normal and the gas pressure is in a circulation state through the window 72.

As shown in fig. 5 and 6, when the gas pressure is lower than the force of the low-pressure spring 54, the pressure of the gas pressure on the diaphragm 50 is reduced, the diaphragm 50 moves upward due to the spring force, the sliding sleeve 51 connected to the diaphragm 50 moves in the same direction, and at this time, the second pulley 47 of the valve rod 34 faces the second passage 63 due to the rise of the sliding sleeve 51, enters the tapered groove 78 of the return rod 75 via the second passage 63 by the valve spring 36, and the valve plug 35 can move forward (i.e., move leftward) until it comes into close contact with the valve seat 29, thereby closing the gas passage 20 and blocking the gas.

As the diaphragm 50 moves upward, the balance cylinder 52 connected to the lower side of the diaphragm 50 also moves in the same direction, and the white color ring 67 rises to be flush with the window 72 of the case cover 53, so that the user can confirm through the window 72 that the gas pressure is reduced and the gas pressure is in the closed state.

In the closed state shown in fig. 5, even if the gas pressure returns to the normal range, the gas cannot flow into the pressure receiving chamber 23 and the diaphragm 50 cannot be pressed down, and the valve plug 35 remains in close contact with the valve seat 29.

When the reason that the gas is turned off due to the low pressure is removed and the user confirms that the gas pressure is restored to the normal range, as shown in fig. 5 and 6, the reset button 77 of the reset mechanism 14 is manually pressed, and at this time, the reset lever 75 coupled below the reset button 77 is synchronously moved downward; accordingly, the slide sleeve 51 is pushed out from the second passage 63 by the return lever 75 of the head 45 and the two pulleys 47 by the return lever 75 in cooperation with the bevel groove 78 of the return lever 75 and the head abutment portion 46, and the slide sleeve 51 and the head 45 are unlocked from each other. When the sliding sleeve 51 is released, the gas pressure overcomes the spring force, and presses the diaphragm 50 to move downward, so that the two stoppers 61 are lowered to the position flush with the two pulleys 47. When the diaphragm 50 returns to the original position, the valve stem 34 and the valve plug 35 of the automatic valve 12 move to the right, and the valve spring 36 is compressed to store the elastic energy until the two pulleys 47 respectively abut against the two stoppers 61, so that the valve plug 35 returns to the valve position, and the gas flow state is restored.

After the manual return is completed and the gas passage 20 is opened, the return button 77 of the return mechanism 14 is released, and the return button 77 and the return lever 75 are returned to their original positions by the elastic force of the return spring 76 for the next use.

As shown in fig. 7 and 8, when the gas pressure is higher than the force of the high pressure spring 55, the diaphragm 50 moves downward against the spring force due to the gas pressure received from above, and the sliding sleeve 51 connected to the diaphragm 50 moves in the same direction, and at this time, the second pulley 47 of the valve stem 34 faces the first passage 62 due to the lowering of the sliding sleeve 51, and enters the bevel groove 78 of the return rod 75 via the first passage 62 by the valve spring 36, and the valve plug 35 advances and seals against the valve seat 29, thereby closing the gas passage 20.

As the diaphragm 50 moves downward, the balance cylinder 52 moves in the same direction as the diaphragm 50, and the red color ring 65 is lowered to be flush with the window 72 of the housing cover 53, so that the user can confirm through the window 72 that the gas pressure is increased and the gas pressure is in the closed state.

After confirming that the gas pressure is restored to the normal range, as shown in fig. 7 and 8, the return button 77 of the return mechanism 14 is manually depressed, at which time the return lever 76 linked below the return button 77 is synchronously moved downward; accordingly, the head 45 and the two pulleys 47 are pushed out of the slide bush 51 from the first passage 62 by the return rod 75 in cooperation with the tapered groove 78 of the return rod 75 and the contact portion 46 at the tip of the valve rod 34, and the mutual locking between the slide bush 51 and the head 45 is released. At the same time as the sliding sleeve 51 is released, the diaphragm 50 moves upward due to the gas pressure being lower than the spring force, raising the two stops 61 to a position flush with the two pulleys 47. When the diaphragm 50 returns to the original position, the valve stem 34 and the valve plug 35 of the automatic valve 12 move rightwards, and the valve spring 36 is pressed to store elastic energy until the two pulleys 47 respectively abut against the two stoppers 61, so that the valve plug 35 returns to the valve position, and the gas circulation state is recovered.

After the manual return is completed and the gas passage 20 is opened, the return button 77 of the return mechanism 14 is released, and the latter and the return lever 75 are returned to the original position by the elastic force of the return spring 76.

In the preferred embodiment, as shown in FIG. 3, the gas pathway 20 further includes a rotary valve 15 and a relief valve 16 from below the automatic valve 12. The gas passage 20 is defined by the rotary valve 15, and the side where the gas flows toward the rotary valve 15 is defined as the inflow side of the gas passage 20, and the side where the gas flows out from the rotary valve 15 is defined as the outflow side of the gas passage 20.

The rotary valve 15 includes a ball valve body 90, and the ball valve body 90 has a flow passage 91 and is clamped between two gaskets 92 to be freely rotated in an airtight manner. The upper part of the ball valve body 90 is connected with a knob 94 through a connecting rod 93, the ball valve body 90 is driven to rotate by rotating the knob 90 degrees, the flow passage 91 is communicated or not communicated with the gas passage 20, and the effect of manually opening and closing the gas is achieved.

The relief valve 16 and the automatic valve 12 are both disposed on the inflow side of the gas passage 20, and the relief valve 16 is located downstream of the automatic valve 12. The valve body 95 of the relief valve 16 is supported by a valve holder 97 to move axially, and is normally held in an open position away from a valve port 101 of a valve seat 98 by a spring force of a valve spring 96. When the hose is deflated or falls off from the hose connector 22, the pipeline gas self-closing device 10 is not normally connected to a gas appliance, and the gas flow exceeds a preset value, the valve body 95 will move forward against the spring force of the valve spring 96 until it is tightly fitted with the valve port 101, so as to block the gas passage 20 and close the gas.

The valve seat 98 is assembled on the inlet side of the ball valve body 90, a spring 99 is wound around the outer periphery of the valve seat, and two ends of the spring 99 respectively abut against the valve seat 98 and a spring holder 100, so that the valve seat 98 is forced to be in airtight contact with the gasket 92 on the inlet side of the ball valve body 90 by the force of the spring 99. The valve holder 97 is partially fitted into the valve holder 98, and the spring holder 100 is locked to the apparatus body 11.

When the safety valve 16 is closed, after the pipeline gas self-closing device 10 and the gas appliance are normally connected, when the knob 94 of the rotary valve 15 is rotated 90 degrees in the closing direction, the ball valve body 90 touches the front end of the safety valve 16, so the valve body 95 is separated from the valve port 101, and then the knob 94 is rotated 90 degrees in the reverse direction, so that the ball valve body 90 returns to the valve opening position, and the state of supplying gas to the downstream of the safety valve 16 is restored. Accompanying this, the valve body 95 of the relief valve 16 returns to the open position by the spring force of the spring 96. Since the rotary valve 15 and the safety valve 16 are well known in the art, further description is not necessary.

FIG. 9 shows an axial cross section of the pipeline gas self-closing device 10a similar to FIG. 3. The difference between the embodiment of fig. 9 and fig. 3 lies in the joint type of the outflow port and the operation manner of the resetting mechanism, and the rest parts are completely the same, so the same parts in both embodiments are denoted by the same symbols, and the previous description of the embodiment of fig. 3 also applies to the embodiment of fig. 9, and will not be repeated. In the embodiment of fig. 3, the return mechanism 14 is of the push-to-release type (e.g., a push-button switch, which is depressed and then released to automatically return to its original position). In the embodiment of fig. 9, the outflow port of the gas path 20 is connected to a screw joint 30, and the screw joint 30 is a single body and is connected to the device body 11 for connecting a pipe joint (not shown) such as a stainless steel bellows, an elbow or a T-shaped pipe; the reset mechanism 14a is of a pull-and-release type (e.g., a ball button of a ball table, which is pulled out and then released by hand to automatically return to its original position).

As shown in fig. 9, the pull-and-return mechanism 14a includes a return lever 81, a return spring 82, and a return button 83. The return lever 81 is constructed in the same manner as the return lever 75 described above, and has a chamfered groove 84, and is assembled in the same manner as the return lever 75 described above, by inserting the lower stem into the sleeve hole 58 of the slide sleeve 51, and the upper stem is extended from the small hole section of the fitting hole 24 above the device body 11 to connect with the return button 83. The return spring 82 surrounds the upper shaft of the return lever 80, and both ends thereof respectively abut against the shoulder 25 of the fitting hole 24 and the shoulder 85 of the return lever 81, so that the return spring 82 is compressed to accumulate elastic energy. The return button 83 is mounted above the return rod 81, a washer 86 and a retaining ring 87 are mounted on the return rod 81, and a circular decorative plate 88 is covered, so that the return button 83 is connected to the return rod 81 to form the pull-and-release return mechanism 14 a.

When the automatic valve 12 blocks the gas passage 20 due to the gas pressure lower than the force of the low-pressure spring 54 or higher than the force of the high-pressure spring 55 and the gas pressure is confirmed to return to the predetermined pressure range, the return button 83 is pulled upward, and the valve plug 35 automatically returns to the open position to return the gas flow. When the return button 83 is released by hand, the return lever 81 and the return button 83 return to the original position due to the elastic force of the return spring 82. The operation principle of the valve plug 35 of the automatic valve 12 to reset to the open position after the operation of the pull-out type reset mechanism 14a is the same as that of the above-mentioned push-out type reset mechanism 14, and is not described again.

Fig. 10 is a modification of fig. 3, and fig. 11 is a modification of fig. 9. Fig. 3 and 9 show the automatic valve 12 and the safety valve 16 both disposed on the inflow side of the gas passage 20, and fig. 10 and 11 show the gas self-closing devices 10b and 10c in which the automatic valve 12 is disposed on the outflow side of the gas passage 20, the safety valve 16 is mounted on the inflow side of the gas passage 20, and one side of the valve spring 36 abuts against a retainer 49, and one side of the retainer 49 abuts against a washer 92 on the outlet side of the ball valve body 90. The two ends of the spring 99 of the safety valve 16 are respectively pressed against the filter 17 and the valve seat 98, so that the valve seat 98 is pressed against the gasket 92 on the inlet side of the ball valve body 90 by the spring force.

The pipeline gas self-closing devices 10/10a/10b/10c disclosed in the above embodiments are further simplified in that the rotary valve 15 and the safety valve 16 are omitted, and a pipeline gas self-closing device 10d having functions of high-pressure automatic closing, low-pressure automatic closing, and manual opening after closing is formed as shown in fig. 12. When the embodiment of fig. 12 is installed in a gas pipeline source in combination with a gas meter or is connected to a large-scale gas appliance in combination with a full-flow gas valve, if the pipeline falls off from the threaded joint 30 or due to other reasons, the gas flow is abnormally increased and the gas pressure is suddenly reduced, the automatic valve 12 is automatically closed due to the low pressure. In brief, the present embodiment has an automatic overcurrent shutoff function even if the safety valve 16 is not provided. The threaded connector 30 of the embodiment of fig. 10, 11 and 12 can also be modified to the hose connector 22 described above, and the embodiments disclosed in fig. 10 to 12 allow the hose connector 22 or the threaded connector 30 to be directly formed on the device body 11.

It should be understood that the above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A gas self-closing device for a pipeline is characterized by comprising:

the device body is provided with a gas passage, a pressure receiving chamber and an assembling hole which are adjacent, and a valve seat is formed on the gas passage;

an automatic valve, including a support locked in the gas passage and adjacent to pilot hole, a valve stem supporting the sliding of the support, a valve plug connected to the valve stem, and a valve spring keeping the valve stem and valve plug in the tension state, the valve stem includes a pole body and a pole head, the front end of the pole head forms a slick and sly abutting part, two sides of the pole head have a pulley separately;

a control mechanism, including a diaphragm used for closing the opening of the compression chamber, a sliding sleeve connected with one side of the diaphragm and kept sliding in the assembling hole, a balance cylinder connected with the other side of the diaphragm, a shell cover locked on the device body and clamping the periphery of the diaphragm together with the device body, and a low-pressure spring and a high-pressure spring arranged between the balance cylinder and the shell cover, wherein the sliding sleeve is provided with a trepan boring and an opening facing the club head and connected with the trepan boring, two side walls of the opening are respectively provided with a backstop, a first channel is defined above the two backstops, and a second channel is formed below the backstops; and

a resetting mechanism, which comprises a resetting rod, a resetting button and a return spring, wherein the resetting rod is kept in the sleeve hole of the sliding sleeve to slide and extends out of the device body;

when the gas pressure is in the range of the low-pressure spring force and the high-pressure spring force, the two pulleys respectively abut against the two backstops to keep the valve plug at a position away from the valve seat, so that the gas passage is in a smooth state;

when the gas pressure is lower than the low-pressure spring force, the rod head and the two pulleys enter the bevel groove of the resetting rod from the second channel, so that the valve plug is tightly engaged with the valve seat to block the gas passage;

when the gas pressure is higher than the high-pressure spring force, the rod head and the two pulleys enter the bevel groove of the resetting rod from the first channel, so that the valve plug is tightly combined with the valve seat to block the gas passage;

when the gas pressure is confirmed to be restored to the normal range, the return button is manually operated, the rod head and the two pulleys exit the sliding sleeve from the first or second channel under the cooperation of the bevel groove and the abutting part, so that the two pulleys are abutted against the two stop blocks again, the valve plug is kept at the valve opening position, and the gas circulation is restored.

2. A gas self-closing device for pipeline according to claim 1, wherein the assembling hole is a reducing hole, and a shoulder is formed at the joint of the large and small hole sections; the device body comprises an annular groove concentric with the small hole section of the assembly hole; the sliding sleeve keeps sliding in the large hole section of the assembling hole; the lower rod body of the resetting rod is flexibly inserted into the sleeve hole of the sliding sleeve, the bevel groove is formed in the lower rod body, the upper rod body of the resetting rod extends out of the device body from the small hole section of the assembling hole to be connected with the resetting button, a rod shoulder is formed between the upper rod body and the lower rod body of the resetting rod, and the upper dead point of the resetting rod is stopped at the position where the rod shoulder contacts the shoulder; the return spring is arranged in the annular groove and compressed into a tensioning state by the return button, and elastic energy for automatically returning the return button and the return rod to the original position is reserved.

3. A gas self-closing device for pipeline according to claim 1, wherein the assembling hole is a reducing hole, and a shoulder is formed at the joint of the large and small hole sections; the sliding sleeve keeps sliding in the large hole section of the assembling hole; the lower rod body of the resetting rod is flexibly inserted into the sleeve hole of the sliding sleeve, the bevel groove is formed in the lower rod body, the upper rod body of the resetting rod extends out of the device body from the small hole section of the assembling hole to be connected with the resetting button, a rod shoulder is formed between the upper rod body and the lower rod body of the resetting rod, and the upper dead center of the resetting rod is stopped at the rod shoulder to contact the shoulder; the return spring is arranged at the large hole section of the assembly hole, two ends of the return spring respectively prop against the shoulder and the rod shoulder to be in a tensioning state, and elastic energy for automatically returning the return button and the return rod to the original position is reserved.

4. A gas pipeline self-closing device as recited in claim 1, wherein the support comprises a frame bottom, and a first support and a second support respectively extending upward from two sides of the frame bottom, the first support is inserted into a slot formed on the device body for positioning, the frame bottom is locked to the device body by two screws, the first support has a rod hole, the second support has a rod slot, the rod of the valve rod passes through the rod hole, the rod is supported by the rod slot, so that the valve rod is kept in the support to slide freely.

5. The gas self-closing device for pipeline according to claim 1, wherein the side wall of the housing cover is provided with at least one window, the periphery of the balance cylinder is provided with a red color ring, a green color ring and a white color ring respectively indicating that the gas pressure exceeds a preset pressure, is in a normal pressure range and is lower than the preset pressure, and the color ring corresponding to the pressure state is flush with the window along with the movement of the balance cylinder.

6. The gas self-closing device for pipeline as recited in claim 1, further comprising a rotary valve for manually opening and closing the gas passage, and a safety valve for automatically shutting off the gas passage when the gas flow rate exceeds a predetermined value.

7. The gas pipeline self-closing apparatus as claimed in claim 6, wherein the gas passage is bounded by the rotary valve, a side of the gas flowing toward the rotary valve is an inflow side of the gas passage, a side of the gas flowing out from the rotary valve is an outflow side of the gas passage, the automatic valve and the safety valve are disposed on the inflow side of the gas passage, and the safety valve is disposed downstream of the automatic valve, or the automatic valve is disposed on the outflow side of the gas passage, and the safety valve is assembled on the inflow side of the gas passage.

8. The gas self-closing device for pipeline as claimed in claim 1, wherein the inflow port of the gas passage has a joint portion formed by internal or external threads, and the outflow port of the gas passage is provided with a hose connector or a screw connector.

9. A gas self-closing device for pipeline as claimed in claim 8, wherein a filter is installed inside the inlet of the gas passage, and the hose connector or screw connector of the outlet is a single body and connected to the device body, or is directly formed on the device body.

10. A gas pipeline self-closing device as recited in claim 1, wherein the housing cover has a center post inside, the center post having a threaded hole with an opening at the bottom of the housing cover for a screw to lock a seat plate at the bottom of the housing cover.

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