Gas timing valve capable of automatically resetting when flow is overflowed

Abstract

The invention discloses a fuel gas timing valve capable of automatically resetting when the flow is overflowed, and belongs to the technical field of safety valves. The fuel gas timing valve comprises a valve body with a cavity, and two sides of the valve body are respectively provided with a gas inlet channel and a gas outlet channel which are communicated with the cavity. A flow passing assembly is arranged in the air inlet channel and is composed of a flow passing valve element, a reset valve element and a fixing base with an air inlet channel. A filter seat and a reset seat with a through hole are installed in the air inlet channel, and a first sealing ring is installed at the end, facing the filter seat, of the reset seat. The two ends of the overflowing valve element are connected between the filtering base and the reset base in a sliding mode and connected with the reset base through an overflowing spring. One end of the reset valve element is slidably connected to the reset base, and the other end of the reset valve element makes contact with the overflowing valve element, is located at the air outlet channel and is provided with a reset spring with the elasticity smaller than that of the overflowing spring. And when the gas flow returns to normal, the design can promote the overflowing assembly to automatically return to the initial state, so that the normal operation of the system is ensured. The mechanism is beneficial for improving safety and efficiency and ensuring stable and reliable gas supply.

Description

Technical Field

[0001] The invention belongs to the technical field of safety valves, and in particular relates to a gas timing valve with automatic reset when there is an over-flow. Background Art

[0002] In the field of gas safety such as fuel gas and toxic gas, when safety valves (such as timing valves, solenoid valves, electric valves, etc.) use overflow devices as accessories, overflow devices play a vital role. When the flow increases to the maximum value of the overflow design, or the outlet pipe falls off and causes underpressure, or the pipeline pressure is too high, the overflow device will automatically close the valve to ensure that there are no safety hazards caused by overcurrent, underpressure, or overpressure. However, once the overflow device cuts off the gas, even if the flow returns to normal or the pipeline is replaced, external intervention is usually required to cooperate with the reset structure to manually realize the reset function of the overflow device and restore the safety valve to normal operation. Summary of the invention

[0003] The present invention is intended to provide a gas timing valve with automatic over-flow reset, so as to realize automatic reset of the over-flow component after the gas flow returns to normal.

[0004] A flow over-flow automatic reset gas timing valve in the present scheme comprises a valve body, a cavity is arranged in the valve body, an air inlet channel and an air outlet channel connected to the cavity are arranged on opposite sides of the valve body, and a transmission mechanism for opening or closing the air outlet channel of the valve body is arranged in the cavity; a flow overflow component is arranged in the air inlet channel, the flow overflow component comprises a flow overflow valve core, a reset valve core and a fixed seat provided with an air inlet channel, and a filter seat and a reset seat provided with a through hole are fixedly connected in sequence in the air inlet channel; a first sealing ring is arranged at one end of the reset seat facing the filter seat, two ends of the flow overflow valve core are slidably connected to the filter seat and the reset seat respectively, an air outlet channel for gas to pass is arranged on the flow overflow valve core, an flow overflow spring is connected to the flow overflow valve core, and one end of the flow overflow spring abuts on the reset seat; one end of the reset valve core is slidably connected to the reset seat, and the other end of the reset valve core abuts on the flow overflow valve core and is located at the air outlet channel, a reset valve core is provided with a reset spring, and one end of the reset spring abuts on the reset seat, and the elastic force of the reset spring is smaller than that of the flow overflow spring.

[0005] The working principle and beneficial effects of this solution are as follows: Since the elastic force of the reset spring is smaller than the elastic force of the overflow spring. When the gas flows from the device into the inlet of the safety valve, if the flow rate increases, the pressure generated is close to the elastic force of the reset spring, and the reset valve core will move toward the reset seat. As the flow rate continues to increase, the pressure generated is greater than the elastic force of the overflow spring, and the overflow valve core will also move toward the reset seat until the overflow valve core is in close contact with the first sealing ring, completing the overcurrent protection and the gas is cut off. Since the elastic force of the reset spring is smaller than the overflow spring, the reset valve core has been completely pressed in before the overflow valve core contacts the first sealing ring. When the flow rate gradually decreases and returns to the normal flow rate value, the overflow valve core will be affected by the combined action of the overflow spring and the reset spring at the same time, generating sufficient elastic force to overcome the adsorption force between the overflow valve core and the first sealing ring, completing automatic reset.

[0006] In addition, when underpressure occurs, the pressure at the outlet decreases or disappears, while there is still pressure at the inlet. At this time, the device cannot complete automatic reset, thereby better eliminating the safety hazards caused by gas leakage.

[0007] Furthermore, the reset valve core is provided with multiple reset valve cores, and the multiple reset valve cores are arranged on the reset seat; the reset seat includes a connecting tube and a fixing ring fixedly connected to the connecting tube, the fixing ring is coaxial with the connecting tube, the end of the connecting tube away from the filter seat is fixedly connected to the fixing seat, and the reset valve core is slidably connected to the fixing ring; the fixing ring is provided with a number of guide tubes equal to the reset valve core, the guide tubes extend in the same direction as the connecting tubes, the guide tubes pass through the fixing ring, the reset valve core is slidably connected in the guide tubes, and the reset spring is supported on the end of the guide tube facing the filter seat; the connection between the connecting tube and the fixing ring is uniformly provided with reinforcing ribs. By providing multiple reset valve cores and annularly arranged on the reset seat, the force of the reset valve core on the filter valve core is made more uniform, the setting of the guide tubes reduces the thickness of the fixing ring and reduces the production cost while ensuring the guiding effect on the reset valve core, and the setting of the reinforcing ribs helps to increase the service life of the fixing ring.

[0008] Furthermore, the end of the connecting tube away from the filter seat is provided with a constriction, a sealing gasket is sleeved at the constriction, and the fixing seat is provided with a placement groove used in conjunction with the sealing gasket; the inner wall of the end of the connecting tube close to the filter seat is provided with a fixing groove for placing the first sealing ring, and the first sealing ring extends outside the fixing groove. The provision of the sealing gasket and the placement groove helps to better ensure the sealing of the connection between the reset seat and the fixing seat. The provision of the fixing groove can better fix the first sealing ring, and the first sealing ring extends outside the fixing groove, so that the sealing performance of the flow valve core when in contact with the first sealing ring is better, ensuring the gas cutting effect.

[0009] Furthermore, the over-flow valve core includes a connecting rod and a second baffle fixedly connected to the connecting rod, the air outlet is arranged on the second baffle, and the air outlet is an air outlet hole or a second notch; a fixed block is fixedly connected inside the connecting pipe, and a gap for gas to pass through is left between the fixed block and the inner wall of the connecting pipe, and the two ends of the connecting rod are respectively slidably connected to the fixed block and the filter seat, and the over-flow spring is sleeved on the connecting rod, and the over-flow spring is located between the second baffle and the fixed block; the air outlet is a plurality of second notches, and the plurality of second notches are evenly distributed at the outer edge of the second baffle. The provision of the second notch helps the gas to directly act on the reset valve core through the second notch.

[0010] Furthermore, the reset valve core includes a guide rod and a supporting plate fixedly connected to one end of the guide rod, and the end of the guide rod away from the supporting plate is slidably connected in the corresponding guide tube. The reset spring is sleeved on the guide rod, and the reset spring is located between the supporting plate and the guide tube. The supporting plate is supported at the second notch of the second baffle plate.

[0011] Furthermore, the transmission mechanism includes a mounting cover and a rotating shaft. A mounting block protruding downward is provided at the bottom of the mounting cover. The mounting block is provided with a horizontal through hole. A push shaft is horizontally slidably connected in the through hole. The push shaft is provided with two shoulders coaxial with the shaft, and the two shoulders are located on the same side of the mounting block; a vertical connecting hole is provided on the mounting cover, and the rotating shaft is rotatably connected in the connecting hole. The top of the rotating shaft is fixedly connected to the relevant valve upper cover, and a movement for driving the valve closing upper cover to deflect is installed on the top of the mounting cover. The bottom of the rotating shaft is fixedly connected to the relevant valve lower cover, and a U-shaped groove is provided on the valve closing lower cover. The push shaft is clamped in the U-shaped groove, and the two shoulders are respectively located on both sides of the U-shaped groove. An adjusting spring is sleeved on the push shaft, and one end of the adjusting spring is fixedly connected to the mounting block, and the other end is abutted against the shoulder adjacent to it. When in use, the coil spring on the movement releases elastic force, causing the movement's door-closing piece to drive the valve-closing upper cover to deflect to a certain extent. Since the valve-closing upper cover and the valve-closing lower cover are fixedly connected to the two ends of the rotating shaft, the rotating shaft rotates and transmits to the valve-closing lower cover at the same time. Under the cooperation of the adjusting spring and the shaft shoulder, the push shaft will be driven to move toward the air inlet end of the valve body, so that the shaft shoulder on the push shaft away from the mounting block is separated from the contact with the valve body's air outlet end, thereby opening the valve. After reaching the preset time, the movement stops working, the movement's door-closing piece is separated from the valve-closing upper cover, and the push shaft returns to the initial position under the action of the adjusting spring, and then drives the push shaft to move toward the valve body's air outlet end. After the shaft shoulder on the push shaft away from the mounting block seals the valve body's air outlet end, the valve is closed. Through the U-shaped groove clamping cooperation between the push shaft and the valve-closing lower cover, and the limiting function of the shaft shoulder, the accuracy and stability of power transmission are ensured, avoiding the problems of power failure or inaccurate output, connector detachment, loosening, etc., thereby improving the overall reliability of the safety valve.

[0012] Furthermore, an "L"-shaped first baffle is integrally formed on the valve closing lower cover, and an end of the first baffle away from the valve closing lower cover extends to an end of the push shaft away from the valve closing lower cover, and an end of the push shaft away from the valve closing lower cover abuts against the first baffle. When the movement drives the rotating shaft to rotate and then drives the valve closing lower cover to deflect, the first baffle can quickly push the push shaft to move to one side of the rotating shaft, thereby improving its responsiveness. In addition, the adjustment spring cooperates with the first baffle, so that the push shaft is always acted upon by the shaft shoulder and the first baffle, thereby preventing the push shaft from loosening or falling off.

[0013] Furthermore, an indicator dial is also provided in the cavity of the valve body, and the indicator dial includes a transparent cover and a base provided with a center hole, the upper surface of the base is provided with a blind hole, an opaque prompt disk is fixedly connected to the upper surface of the base, an avoidance hole is provided on the prompt disk, a pointer, a warning word and an operation method are engraved on the upper surface of the prompt disk around the avoidance hole, and a first notch extending to the avoidance hole is provided on the outer wall of the prompt disk; a fixing rod extending downward is provided at the center of the transparent cover, and the fixing rod is rotatably connected to the center hole through the avoidance hole; a transparent engraved The dial is located in the blind hole and below the prompt plate, the dial is 1.5 to 2.5 mm away from the bottom of the blind hole, the dial is provided with a time scale, the dial is provided with a relief opening in the shape of an arc coaxial with the fixed rod, the dial is provided with a cutout, the cutout extends from one end of the avoidance opening to the outer edge of the dial, and the free end of the cutout of the dial is located at the first notch; a protective cover is provided on the transparent cover; the movement includes a coil spring and a movement shaft for driving the fixed rod, the movement shaft is fixedly connected to the fixed rod, and the base is fixedly connected to the movement.

[0014] At present, some timing valves are products that rely on pure mechanical mechanisms to drive the time status display. There are two main time indication methods for this type of product: one type uses the traditional thin pointer and dial design. When reading the time, it is difficult to read the time because the pointer is thin and the content of the dial is complex; the other type uses a red translucent part instead of a pointer, and the red part is turned out when the time needs to be indicated, but the red part mainly relies on a protruding small pointer to indicate the time, and although the large area of ​​red can play a significant eye-catching role, it is easy to cause confusion for the accurate indication of the time. Although both time indication methods can achieve time indication well, when they are applied to special fields, especially fields such as gas timing valves that require operation instructions, warnings and other text information, because the same interface needs to display not only the scale, but also the operation method, warnings and other text, the font and scale are very small, and users often find it difficult to read the time quickly and accurately, and are prone to ignore important warnings, thereby increasing the risk of misoperation and the possibility of accidents. These problems are more prominent when the user is at a certain distance from the dial, making the time display unclear and the warning words inconspicuous, which in turn affects the safe use of the product.

[0015] This solution sets more time scales separately on the dial, and then sets the pointer, warning words and operation methods on the indicator dial, so that the pointer, warning words, operation methods and time scales can be set larger for easy viewing. Before use, the base of the indicator dial is fixedly connected to the movement of the mechanical timing valve, and the fixing rod is connected to the movement shaft.

[0016] In the initial state, the dial is hidden under the prompt disk, so that the warning words and operation methods on the prompt disk are clearly visible, which can better remind the user to operate safely. When the indicator dial is working, by rotating the transparent cover clockwise, the transparent cover drives the dial to rotate, and the dial begins to rotate out and then covers part of the prompt disk. When the dial rotates out, the time scale on the dial is displayed, and the time scale corresponding to the pointer is the current timing time. When the transparent cover is released, the coil spring on the movement begins to release its elastic force, and the movement, under the action of a specific mechanism, begins to drive the dial and the transparent cover to rotate in opposite directions. At this time, the indicator dial begins to enter the timing function (countdown).

[0017] In the indicator dial of this solution, during the entire countdown process, the larger time scale is gradually covered by the opaque reminder disk, and the scale display becomes less and less, truly interpreting the concept of countdown. The pointer is specially eye-catching and fixed, so that users can accurately read the corresponding remaining time. In addition, the dial is set to be transparent. Even if the time scale of the dial is rotated out to the top of the indicator disk, the warning words and operation methods on the reminder disk can be seen, thereby reminding the user again and further improving the safety of use.

[0018] Furthermore, a second threaded hole is provided at the center of the top of the movement shaft, a fastening screw is threadedly connected in the second threaded hole, a through hole is provided in the axial direction of the fixing rod for the movement shaft to pass through, a guide hole coaxial with the through hole is provided on the top of the transparent cover and the two are connected, and the fastening screw passes through the guide hole and is threadedly connected to the second threaded hole. By setting the second threaded hole and the guide hole, the fixing rod and the movement shaft can be quickly fixed or separated.

[0019] Furthermore, a circular placement groove is provided on the top of the transparent cover, the placement groove is coaxial with the guide hole, the diameter of the placement groove is larger than the aperture of the guide hole, a second washer is provided in the placement groove, a fastening screw passes through the second washer and the guide hole and is fixedly connected with the second threaded hole, a cap is provided in the placement groove, and the second washer and the fastening screw are located in the cap. The placement groove and the second washer can better ensure that the fixing rod is fixed to the movement shaft, and the cap can prevent the second washer and the fastening screw from being directly exposed to the outside, making the top of the time status indicator more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A three-dimensional diagram of a gas timing valve with automatic over-flow reset according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A longitudinal cross-sectional view of

[0022] Figure 3 for Figure 1 Exploded diagram of

[0023] Figure 4 for Figure 1 The structural diagram of the transmission mechanism;

[0024] Figure 5 for Figure 4 Exploded diagram of

[0025] Figure 6 for Figure 1 Exploded view of the middle indicator dial after it is connected to the movement;

[0026] Figure 7 for Figure 6 The state diagram of the indicator dial when it is not working;

[0027] Figure 8 for Figure 6 The state diagram of the indicator dial when working;

[0028] Fig. 9 for Figure 1 A three-dimensional diagram of the medium flow component;

[0029] Fig.10 for Fig. 9 Exploded view of medium flow flow components;

[0030] Fig.11 for Fig. 9 Longitudinal section view of . DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The reference numerals in the drawings of the specification include: valve body A, indicator dial B, operation method B1, pointer B2, warning word B3, time scale B4, outlet connection component C, transmission mechanism E, outlet joint 1, third sealing ring 2, second bushing 3, air outlet channel 4, fourth sealing ring 5, push shaft 6, adjustment spring 7, installation cover 8, rotating shaft 9, valve closing cover 10, movement 11, base 12, dial 13, prompt plate 14, transparent cover 15, anti- Protective cover 16, cover cap 17, valve shut-off lower cover 18, flow assembly 19, filter seat 191, flow valve core 192, second baffle 1921, second notch 1922, flow spring 193, first sealing ring 194, reset valve core 195, supporting plate 1951, guide rod 1952, reset spring 196, reset seat 197, connecting pipe 1971, guide pipe 1972, fixing ring 1973, sealing gasket 198, fixing seat 199.

[0033] The embodiment is basically as shown in the attached Figures 1 to 3 As shown: a flow over-flow automatic reset gas timing valve, including a valve body A, a cavity is provided in the valve body A, an air inlet channel and an air outlet channel 4 connected to the cavity are respectively provided on opposite sides of the valve body A, a transmission mechanism E for opening or closing the air outlet channel 4 of the valve body A is provided in the cavity; an outlet connection component C is provided in the air outlet channel 4, the outlet connection component C includes an outlet joint 1 and a second bushing 3, the second bushing 3 is fixed in the air outlet channel 4, the outlet joint 1 is fixedly connected to the second bushing 3, and a third sealing ring 2 is provided at the contact position between the outlet joint 1 and the air outlet channel 4 to ensure sealing.

[0034] Transmission mechanism E as attached Figures 4-5As shown, it includes a mounting cover 8, a rotating shaft 9 and a movement 11 for driving the rotating shaft 9 to deflect, the mounting cover 8 divides the cavity in the valve body A into two parts, an upper part and an lower part, and a fourth sealing ring 5 is provided between the mounting cover 8 and the inner wall of the valve body A to ensure the airtightness of the connection; three columns are fixedly connected to the top of the mounting cover 8, and the movement 11 is fixedly connected to the mounting cover 8 through the columns, and a downwardly protruding mounting block is provided at the bottom of the mounting cover 8, and a horizontal through hole is provided on the mounting block, and a first bushing is provided in the through hole, and a push shaft 6 is horizontally slidably connected in the first bushing, and two coaxial shoulders are provided on the push shaft 6, and the two shoulders are located on the same side of the mounting block, and the shoulder away from the mounting block is used to seal the air outlet end of the valve body A; a vertical connecting hole is provided on the mounting cover 8, and the rotating shaft 9 is rotatably connected in the connecting hole, and the rotating shaft 9 is Two annular mounting grooves are provided on the top, and a second sealing ring is sleeved in the mounting groove; in order to improve the stability of the rotating shaft 9 during rotation, the upper and lower ends of the mounting cover 8 are integrally formed with a connecting shaft, the connecting shaft is coaxial with the connecting hole, and the rotating shaft 9 passes through the connecting shaft and is rotatably connected thereto; the top of the rotating shaft 9 is fixedly connected to the relevant valve upper cover 10, and the bottom of the rotating shaft 9 is fixedly connected to the relevant valve lower cover 18, and the valve closing upper cover 10 and the valve closing lower cover 18 are both plastic parts; more specifically, both ends of the rotating shaft 9 are D-axes, and the valve closing upper cover 10 and the valve closing lower cover 18 are both provided with D holes that cooperate with the D-axes, and then the rotating shaft 9 is fixedly connected with the valve closing upper cover 10 and the valve closing lower cover 18 by a locking screw, the locking screw is coaxial with the rotating shaft 9, and a first gasket is provided at the connection between the locking screw and the valve closing upper cover 10 and the valve closing lower cover 18.

[0035] In addition, the valve closing lower cover 18 includes a columnar connecting portion, a clamping portion and a first baffle integrally formed on the connecting portion, a D hole is provided on the connecting portion and is fixedly connected to the bottom of the rotating shaft 9; the clamping portion is "U"-shaped and the open end is away from the connecting portion, the open end of the clamping portion is a U-shaped groove, the push shaft 6 is clamped in the U-shaped groove, and the two shoulders are respectively located on both sides of the U-shaped groove, an adjusting spring 7 is sleeved on the push shaft 6, one end of the adjusting spring 7 is fixed to the mounting block, and the other end is abutted against the shoulder adjacent to it; the first baffle is "L"-shaped, one end of the first baffle connected to the connecting portion is perpendicular to the clamping portion, the other end of the first baffle is parallel to the clamping portion, the end of the first baffle away from the connecting portion extends to the end of the push shaft 6 away from the connecting portion, and the end of the push shaft 6 away from the connecting plate abuts against the first baffle.

[0036] The cavity of the valve body A is also provided with an indicator dial B, as shown in the attached Figures 6 to 8As shown, it comprises a transparent cover 15 and a base 12 with a center hole, the upper surface of the base 12 is provided with a circular blind hole, and an opaque prompt plate 14 is fixedly connected to the upper surface of the base 12. Specifically, the prompt plate 14 is glued to the base 12, and an avoidance hole is provided on the prompt plate 14. A pointer B2, a warning word B3 and an operation method B1 are printed around the avoidance hole on the upper surface of the prompt plate 14, and a first notch extending to the avoidance hole is provided on the outer wall of the prompt plate 14; a protective cover 16 is sleeved on the transparent cover 15, and the center of the transparent cover 15 is provided with a protective cover 16. A fixing rod extending downward is provided at the center, and the fixing rod is rotatably connected to the center hole through the avoidance hole; a transparent dial 13 is fixedly connected to the fixing rod, and the dial 13 is located in the blind hole and below the prompt plate 14, and the dial 13 is mm away from the bottom of the blind hole. A time scale B4 is provided on the dial 13, and an arc-shaped avoidance opening coaxial with the fixing rod is provided on the dial 13. A notch is provided on the dial 13, and the notch extends from one end of the avoidance opening to the outer edge of the dial 13, and the free end of the notch of the dial 13 is located at the first notch.

[0037] The movement 11 includes a coil spring, and the movement 11 also includes a movement shaft for driving a fixed rod, the movement shaft is fixedly connected to the fixed rod, and the base 12 is fixedly connected to the movement 11 by a fixing screw. A second threaded hole is provided at the center of the top of the movement shaft, and a fastening screw is threadedly connected in the second threaded hole. A through hole for the movement shaft to pass through is provided in the axial direction of the fixed rod, and a guide hole coaxial with the through hole is provided at the top of the transparent cover 15, and the two are connected. A circular placement groove is provided at the top of the transparent cover 15, and the placement groove is coaxial with the guide hole, and the diameter of the placement groove is larger than the aperture of the guide hole. A second washer is provided in the placement groove, and the fastening screw passes through the second washer and the guide hole and is fixedly connected to the second threaded hole. A cap 17 is detachably connected in the placement groove, and the second washer and the fastening screw are located in the cap 17 to improve the aesthetics.

[0038] A flow component 19 is provided in the air inlet passage. Figures 9-11 As shown, it includes a fixed seat 199, a reset seat 197, a filter seat 191, a flow valve core 192, a reset valve core 195, a first sealing ring 194, a sealing gasket 198, a flow spring 193 and three reset springs 196. The fixed seat 199 is cylindrical, and both ends of the fixed seat 199 are provided with chamfers; one end of the fixed seat 199 is provided with an air inlet with a circular cross-section, and the other end of the fixed seat 199 is provided with a mounting hole, the aperture of the mounting hole is smaller than the aperture of the air inlet, the air inlet is connected with the mounting hole, and the mounting hole, the air inlet and the fixed seat 199 are coaxial; the fixed seat 199 is provided with a mounting groove, and the mounting groove is located at the connection between the air inlet and the mounting hole.

[0039] The filter seat 191 is cylindrical, with one end of the filter seat 191 being open, and the open end of the filter seat 191 being chamfered for easy installation; the other end of the filter seat 191 is evenly distributed with filter holes, and a fixing column is provided at the center of the bottom of the filter seat 191, and a guide hole is provided at the center of the fixing column; the filter seat 191 is installed in the air inlet duct of the fixing seat 199 in a tight fit manner, and the filter seat 191 is located at the end of the air inlet duct away from the mounting hole, and the open end of the filter seat 191 faces the mounting hole.

[0040] The reset seat 197 includes a connecting tube 1971 and a fixing ring 1973 integrally formed on the connecting tube 1971. The fixing ring 1973 is coaxial with the connecting tube 1971. Three guide tubes 1972 are evenly distributed on the fixing ring 1973. The guide tubes 1972 extend in the same direction as the connecting tube 1971. The guide tubes 1972 pass through the fixing ring 1973. Three reinforcing ribs are evenly distributed at the connection between the connecting tube 1971 and the fixing ring 1973. A cross is fixedly connected inside the connecting tube 1971. shaped fixing block, a connecting hole is provided at the center of the fixing block; a shrinkage is provided at one end of the connecting pipe 1971, a fixing groove is provided on the inner wall of the other end of the connecting pipe 1971, a first sealing ring 194 is fixed in the fixing groove by gluing, and the first sealing ring 194 extends out of the fixing groove; a sealing gasket 198 is sleeved on the shrinkage of the connecting pipe 1971, the sealing gasket 198 is fixed in the placement groove by a tight fit, and the shrinkage of the connecting pipe 1971 is fixed in the installation hole of the fixing seat 199 by a tight fit;

[0041] The overflow valve core 192 includes a connecting rod and a second baffle 1921 fixedly connected to the connecting rod, the second baffle 1921 is circular, and the diameter of the second baffle 1921 is smaller than the aperture of the opening end of the filter seat 191; the outer edge of the second baffle 1921 is evenly distributed with second notches 1922, the second notches 1922 are used for gas to pass through, the two ends of the connecting rod slide in the guide hole of the fixed column and the connecting hole of the fixed block respectively, the overflow spring 193 is sleeved on the connecting rod, the overflow spring 193 passes through the first sealing ring 194, and the overflow spring 193 is located between the second baffle 1921 and the fixed block.

[0042] There are three reset valve cores 195, which include a guide rod 1952 and a support plate 1951 integrally formed at one end of the guide rod 1952. The support plate 1951 is circular, and one end of the guide rod 1952 away from the support plate 1951 is slidably connected to the corresponding guide tube 1972. Three reset springs 196 are respectively sleeved on the three guide rods 1952, and the reset spring 196 is located between the support plate 1951 and the guide tube 1972. The support plate 1951 is supported at the second notch 1922 of the second baffle plate 1921; the sum of the elastic forces of the three reset springs 196 is less than the over-current spring 193. The specific implementation process is as follows:

[0043] Install the outlet connection assembly C: fix the second bushing 3 in the outlet channel 4, then fix the outlet joint 1 in the second bushing 3, and ensure that the contact portion between the outlet joint 1 and the outlet channel 4 is provided with a third sealing ring 2 to ensure sealing.

[0044] Install the transmission mechanism E: Install the fourth sealing ring 5 between the mounting cover 8 and the inner wall of the valve body A to ensure the tightness of the connection. Then fix the movement 11 to the top of the mounting cover 8 through the column. Set the first bushing in the through hole of the bottom mounting block of the mounting cover 8, and then connect the push shaft 6 horizontally in the first bushing, and ensure that the two shoulders on the push shaft 6 are on the same side of the mounting block. Rotate the rotating shaft 9 to connect it to the vertical connecting hole on the mounting cover 8, and improve the stability of the rotation of the rotating shaft 9 through the connecting shaft. Sleeve the second sealing ring in the mounting groove on the rotating shaft 9. Match the valve closing upper cover 10 and the valve closing lower cover 18 through the D axis and the D hole, and use the locking screws to fix them at both ends of the rotating shaft 9, and set the first gasket at the connection between the locking screw and the valve closing upper cover 10 and the valve closing lower cover 18. The push shaft 6 is clamped in the U-shaped groove of the valve closing lower cover 18, and the adjusting spring 7 is put on. One end of the adjusting spring 7 is fixed on the side of the mounting block facing the shaft shoulder, and the other end is abutted on the shaft shoulder adjacent to it; in the initial state, the shaft shoulder away from the mounting block faces the outlet joint 1 and seals it.

[0045] Install the indicator dial B: glue the opaque reminder disk 14 to the upper surface of the base 12, and ensure that the avoidance hole, the first notch, and the engraved pointer B2, the warning word B3 and the operation method B1 on the reminder disk 14 are accurately positioned. Fix the transparent dial 13 to the fixing rod of the transparent cover 15, and make the dial 13 located in the blind hole on the upper surface of the base 12 and below the reminder disk 14, and keep the dial 13 at a specific distance from the bottom of the blind hole. Put the transparent cover 15 on the protective cover 16, and fix the fixing rod to the movement shaft through the second threaded hole, the fastening screw, the second washer and the guide hole at the top of the movement shaft, and finally install the cover 8 in the placement groove to improve the aesthetics.

[0046] Install the flow component 19: Install the flow component 19 in the air inlet passage of the valve body A, and the filter seat 191 is located on the side of the air inlet passage away from the cavity of the valve body A.

[0047] In the initial state, the scale plate 13 is hidden under the prompt plate 14, so that the warning words B3 and the operation method B1 on the prompt plate 14 are clearly visible, which can better remind the user to operate safely. The push shaft 6 is in the initial position under the action of the adjustment spring 7, and the shoulder of the push shaft 6 away from the mounting block seals the outlet end of the valve body A to close the valve. The overflow valve core 192 is in the initial position under the action of the overflow spring 193, and the reset valve core 195 is held at the outlet of the overflow valve core 192 under the action of the reset spring 196.

[0048] When in use, by rotating the transparent cover 15 clockwise, the transparent cover 15 drives the dial 13 to rotate, and the dial 13 starts to rotate out and then partially blocks the prompt disk 14. When the dial 13 rotates out, the time scale B4 on the dial 13 is displayed, and the time scale B4 corresponding to the pointer B2 is the current timing time. When the transparent cover 15 is released, the coil spring on the movement 11 begins to release its elastic force, and the movement 11, under the action of a specific mechanism, begins to drive the dial 13 and the transparent cover 15 to rotate in opposite directions. At this time, the indicator dial B begins to enter the timing function (countdown). During the entire countdown process, the larger time scale B4 is gradually covered by the opaque prompt disk 14, and the scale display becomes less and less, truly interpreting the concept of countdown. The pointer B2 is specially treated to be eye-catching and fixed, and the user can accurately read the corresponding remaining time. In addition, the dial 13 is set to be transparent. Even if the time scale B4 of the dial 13 is rotated to the top of the indicator disk, the warning word B3 and the operation method B1 on the prompt disk 14 can still be seen, thereby reminding the user again and further improving the safety of use.

[0049] When the coil spring on the movement 11 releases its elastic force, the closing plate of the movement 11 drives the closing valve upper cover 10 to deflect to a certain extent. Since the closing valve upper cover 10 and the closing valve lower cover 18 are respectively fixedly connected to the two ends of the rotating shaft 9, the rotating shaft 9 rotates and transmits the rotation to the closing valve lower cover 18. With the cooperation of the adjusting spring 7 and the shoulder, the push shaft 6 will be driven to move toward the air inlet end of the valve body A, so that the shoulder of the push shaft 6 away from the mounting block is separated from the contact with the air outlet end of the valve body A, thereby realizing the valve opening. At this time, the gas flows in from the air inlet channel of the valve body A and enters the cavity of the valve body A through the flow component 19.

[0050] If the gas flow increases, the pressure generated is close to the elastic force of the reset spring 196, and the reset valve core 195 will move toward the reset seat 197. As the flow continues to increase, the pressure generated is greater than the elastic force of the overflow spring 193, and the overflow valve core 192 will also move toward the reset seat 197 until the overflow valve core 192 is in close contact with the first sealing ring 194, completing the overcurrent protection and the gas is cut off. Since the elastic force of the reset spring 196 is less than that of the overflow spring 193, the reset valve core 195 has been completely pressed in before the overflow valve core 192 contacts the first sealing ring 194. When the flow gradually decreases and returns to the normal flow value, the overflow valve core 192 will be simultaneously acted upon by the overflow spring 193 and the reset spring 196, generating sufficient elastic force to overcome the adsorption force between the overflow valve core 192 and the first sealing ring 194, completing automatic reset.

[0051] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A flow over-flow automatic reset gas timing valve, comprising a valve body, a cavity is provided in the valve body, an air inlet channel and an air outlet channel connected to the cavity are provided on opposite sides of the valve body, a transmission mechanism for opening or closing the air outlet channel of the valve body is provided in the cavity; a flow over-flow component is provided in the air inlet channel, characterized in that: The overflow component includes an overflow valve core, a reset valve core and a fixed seat provided with an air inlet passage, in which a filter seat and a reset seat provided with a through hole are fixedly connected in sequence; a first sealing ring is provided at one end of the reset seat facing the filter seat, two ends of the overflow valve core are respectively slidably connected to the filter seat and the reset seat, an outlet passage for gas to pass is provided on the overflow valve core, an overflow spring is connected to the overflow valve core, and one end of the overflow spring abuts against the reset seat; one end of the reset valve core is slidably connected to the reset seat, and the other end of the reset valve core abuts against the overflow valve core and is located at the outlet passage, a reset spring is provided on the reset valve core, and one end of the reset spring abuts against the reset seat, and the elastic force of the reset spring is smaller than that of the overflow spring.

2. A flow-overflow automatic reset gas timing valve according to claim 1, characterized in that: The reset valve cores are provided with multiple ones, and multiple reset valve core rings are arranged on the reset seat; the reset seat includes a connecting pipe and a fixing ring fixedly connected to the connecting pipe, the fixing ring and the connecting pipe are coaxial, the end of the connecting pipe away from the filter seat is fixedly connected to the fixing seat, and the reset valve core is slidably connected to the fixing ring; the fixing ring is provided with guide tubes of the same number as the reset valve cores, the guide tubes and the connecting tubes extend in the same direction, the guide tubes pass through the fixing ring, the reset valve core is slidably connected in the guide tube, and the reset spring is held against the end of the guide tube facing the filter seat; reinforcing ribs are evenly distributed at the connection between the connecting pipe and the fixing ring.

3. A flow-overflow automatic reset gas timing valve according to claim 2, characterized in that: The end of the connecting tube away from the filter seat is provided with a necking, a sealing gasket is sleeved at the necking, and the fixing seat is provided with a placement groove used in conjunction with the sealing gasket; the inner wall of the end of the connecting tube close to the filter seat is provided with a fixing groove for placing the first sealing ring, and the first sealing ring extends outside the fixing groove.

4. The automatic reset gas timing valve according to claim 3, characterized in that: The overflow valve core includes a connecting rod and a second baffle fixedly connected to the connecting rod, the air outlet is arranged on the second baffle, and the air outlet is an air outlet hole or a second notch; a fixed block is fixedly connected to the connecting pipe, and a gap for gas to pass is left between the fixed block and the inner wall of the connecting pipe, and the two ends of the connecting rod are respectively slidably connected to the fixed block and the filter seat, the overflow spring is sleeved on the connecting rod, and the overflow spring is located between the second baffle and the fixed block; the air outlet is a plurality of second notches, and the plurality of second notches are evenly distributed at the outer edge of the second baffle.

5. The automatic reset gas timing valve according to claim 4, characterized in that: The reset valve core includes a guide rod and a supporting plate fixedly connected to one end of the guide rod, and the end of the guide rod away from the supporting plate is slidably connected in the corresponding guide tube. The reset spring is sleeved on the guide rod, and the reset spring is located between the supporting plate and the guide tube. The supporting plate is supported at the second notch of the second baffle.

6. A flow-overflow automatic reset gas timing valve according to any one of claims 1 to 5, characterized in that: The transmission mechanism includes a mounting cover and a rotating shaft. A mounting block protruding downward is provided at the bottom of the mounting cover. The mounting block is provided with a horizontal through hole. A push shaft is horizontally slidably connected in the through hole. The push shaft is provided with two shoulders coaxial with the push shaft, and the two shoulders are located on the same side of the mounting block; a vertical connecting hole is provided on the mounting cover, and the rotating shaft is rotatably connected in the connecting hole. The top of the rotating shaft is fixedly connected to the relevant valve upper cover, and a movement for driving the valve closing upper cover to deflect is installed on the top of the mounting cover. The bottom of the rotating shaft is fixedly connected to the relevant valve lower cover, and the valve closing lower cover is provided with a U-shaped groove, and the push shaft is clamped in the U-shaped groove, and the two shoulders are respectively located on both sides of the U-shaped groove. An adjusting spring is sleeved on the push shaft, and one end of the adjusting spring is fixedly connected to the mounting block, and the other end abuts against the shoulder adjacent to it.

7. The automatic reset gas timing valve according to claim 6, characterized in that: An "L"-shaped first baffle is integrally formed on the valve closing lower cover, and one end of the first baffle away from the valve closing lower cover extends to the end of the push shaft away from the valve closing lower cover, and the end of the push shaft away from the valve closing lower cover abuts against the first baffle.

8. The automatic reset gas timing valve according to claim 7, characterized in that: An indicating dial is also provided in the cavity of the valve body, and the indicating dial comprises a transparent cover and a base provided with a center hole, a blind hole is provided on the upper surface of the base, an opaque prompting plate is fixedly connected to the upper surface of the base, an avoidance hole is provided on the prompting plate, a pointer, a warning word and an operating method are printed around the avoidance hole on the upper surface of the prompting plate, and a first notch extending to the avoidance hole is provided on the outer wall of the prompting plate; a fixing rod extending downward is provided at the center of the transparent cover, and the fixing rod is rotatably connected to the center hole through the avoidance hole; a transparent dial is fixedly connected to the fixing rod The dial is located in the blind hole and below the prompt plate, the dial is 1.5 to 2.5 mm away from the bottom of the blind hole, the dial is provided with a time scale, the dial is provided with a superior arc-shaped avoidance opening coaxial with the fixed rod, the dial is provided with a cutout, the cutout extends from one end of the avoidance opening to the outer edge of the dial, and the free end of the dial cutout is located at the first notch; a protective cover is provided on the transparent cover; the movement includes a coil spring and a movement shaft for driving the fixed rod, the movement shaft is fixedly connected to the fixed rod, and the base is fixedly connected to the movement.

9. The automatic reset gas timing valve according to claim 8, characterized in that: A second threaded hole is provided at the center of the top of the movement shaft, and a fastening screw is threadedly connected to the second threaded hole. A through hole for the movement shaft to pass through is provided in the axial direction of the fixing rod, and a guide hole coaxial with the through hole is provided on the top of the transparent cover and the two are connected, and the fastening screw passes through the guide hole and is threadedly connected to the second threaded hole.

10. The automatic reset gas timing valve according to claim 9, characterized in that: A circular placement groove is provided on the top of the transparent cover. The placement groove is coaxial with the guide hole. The diameter of the placement groove is larger than the aperture of the guide hole. A second washer is provided in the placement groove. The fastening screw passes through the second washer and the guide hole and is fixedly connected to the second threaded hole. A cover cap is provided in the placement groove. The second washer and the fastening screw are located in the cover cap.

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