CN111336293B

CN111336293B - Air valve

Info

Publication number: CN111336293B
Application number: CN202010180140.7A
Authority: CN
Inventors: 何原涛; 杜仁辉; 秦浩然
Original assignee: Chengdu Tnda Gas Equipment Co ltd
Current assignee: Chengdu Tnda Gas Equipment Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2021-09-28
Anticipated expiration: 2040-03-16
Also published as: CN111336293A

Abstract

The invention is suitable for the technical field of gas valves, and provides a gas valve with overcurrent protection and overtemperature protection functions. The temperature assembly structure in the air valve comprises a temperature control switch and a third spring, wherein the temperature control switch and the third spring are arranged in a valve core, the third spring is clamped between a positioning structure of the valve core and the temperature control switch, when the temperature exceeds a certain value, the temperature control switch is melted, the third spring loses limit control and moves leftwards, and the third spring directly pushes a lower valve clack to move. The invention adopts a mechanical motion mode, has reliable temperature control and avoids the defect of instability of the traditional magnetic control; meanwhile, in a high-temperature condition, the spring directly pushes the lower valve clack to realize sealing, other secondary force transmission is not needed, the response speed is high, and the response is stable; and the moving parts in the high-temperature condition are all arranged in the shell, so that the accident that the moving parts are possibly clamped by other foreign matters when arranged outside is avoided.

Description

Air valve

Technical Field

The invention belongs to the technical field of gas valves, and particularly relates to a gas valve with overcurrent protection and overtemperature protection functions.

Background

The gas valve is mainly applied to household gas, is arranged in front of a kitchen range or a combustion appliance, and is used for preventing safety accidents caused by the sudden increase of gas flow during flameout, pipe breakage and pipe detachment; of course, the gas valve can be installed on other pipelines which need to limit the excessive gas flow.

In the prior art, a gas valve mostly adopts a magnet and a magnetic ring to realize opening and closing of the valve, as shown in fig. 1, wherein an arrow direction indicates an air intake direction, a magnetic ring 102 is arranged outside a housing 101, the magnetic ring 102 can move left and right on the housing 101, a magnetic valve core 103 and a valve port 104 are arranged in an air flow channel of the housing 101, an overtemperature spring 105 and a high-temperature fusible component 106 are further arranged on the right side of the magnetic ring 102, the high-temperature fusible component 106 is fused to release the overtemperature spring 105 when reaching a certain temperature, and when in specific use, the high-temperature fusible component is usually made of materials such as plastics or glue; as shown in fig. 2, when the gas valve exceeds a certain temperature, the released over-temperature spring 105 will push the magnetic ring 102 to guide the magnetic valve core 103 to perform corresponding actions, specifically, the magnetic ring 102 moves towards the direction close to the valve port 104, so that the magnetic valve core 103 moves towards the direction close to the valve port 104, and the gas valve is closed, thereby ensuring safe use; meanwhile, in a non-high temperature environment at ordinary times, the opening and closing of the air valve are realized by manually guiding the magnetic valve core 103, specifically, when the magnetic ring 102 moves towards the direction close to the valve port 104, the magnetic valve core 103 moves towards the direction close to the valve port 104, at this time, the air valve is closed, and when the magnetic ring 102 moves towards the direction far away from the valve port 104, the magnetic valve core 103 moves towards the direction far away from the valve port 104, at this time, the air valve is opened. For example, patents CN208651731U, CN205401855U, and CN101963253B all adopt similar structures.

However, the above structure has the following defects in use:

1) since the magnet will decay in magnetism during use, especially in a relatively high temperature environment, the magnet will decay more rapidly, and thus after a period of use, there may be a problem of uncontrollable or inaccurate control, and a serious safety accident may be caused due to an excessively long valve closing time or unstable valve closing.

2) When a high-temperature condition occurs, the overtemperature spring drives the magnetic ring at first and then indirectly drives the magnetic-conductive valve core, so that the valve is closed, the response speed is low, and the danger is further increased due to the increase of response links.

3) The gas pipeline often has magnetic permeability dust such as very much rust, will be because of being adsorbed in the moving part by the magnetization when gas flows through case magnetic conductive part, causes the pipeline flow resistance increase even influences sealedly.

4) The high-temperature fusible component is usually made of plastic or glue, and the melting time is slow.

5) The spring usually adopts an overtemperature spring which needs to be kept at a specified temperature for a certain time to react and has slow response speed.

Disclosure of Invention

The invention aims to provide an air valve with overcurrent protection and overtemperature protection functions, and aims to solve the technical problem that the air valve in the prior art is unreliable in driving.

The invention is realized in such a way that the air valve comprises an air inlet joint, a filter screen, a shell, a valve seat, a lower valve clack, a protective sleeve, a sliding switch, an air outlet joint, an upper valve clack assembly structure, a first spring, a second spring, a temperature assembly structure, a sliding structure and an air outlet joint, wherein the filter screen is fixedly connected in an inner cavity of the air inlet joint, the shell is arranged at the right side of the air inlet joint, the valve seat is arranged between the upper valve clack assembly structure and the lower valve clack, the left side of the lower valve clack is provided with the first spring, the right side of the lower valve clack is provided with the second spring, the air outlet joint is arranged at the right side of the sliding structure, the air valve is characterized in that the temperature assembly structure is arranged in the sliding structure, the temperature assembly structure comprises a temperature control switch and a third spring, and the temperature control switch and the third spring are both arranged in the valve core, the third spring is clamped between the positioning structure of the valve core and the temperature control switch, when the temperature exceeds a certain value, the temperature control switch is melted, the third spring loses limit control and moves leftwards, and the third spring directly pushes the lower valve clack to move.

The upper valve clack assembly structure comprises an upper valve clack guide sleeve and an upper valve clack, and the upper valve clack guide sleeve is arranged between the air inlet joint and the positioning structure of the shell; the right part of the upper valve clack is a cylinder part used for being jointed with the valve seat, the upper valve clack is also provided with a rod part, the rod part extends from the center of the inner side of the cylinder part, penetrates through a center hole of the upper valve clack guide sleeve and extends to the air inlet connector, and a fourth spring is arranged on the rod part.

The sliding structure comprises a sliding switch, a lock pin and a valve core; the sliding switch is provided with a fixing piece facing the center of the shell, the shell is provided with a directional sliding groove, the directional sliding groove is arranged along the axial direction of the shell, and the fixing piece penetrates through the directional sliding groove and then extends into the valve core.

When the valve overflows, the air pressure difference reaches the designed value, the upper valve clack overcomes the spring force of the fourth spring to move rightwards, and the cylinder part is further connected with the valve seat to realize sealing;

when the temperature is high, the third spring loses the limit control and moves leftwards, and the third spring pushes the lower valve clack to move leftwards, so that the lower valve clack is propped against the right part of the valve seat to form sealing;

when the valve needs to be manually closed, the sliding switch is manually pushed to move leftwards, the sliding switch drives the valve core to move leftwards through the lock pin, the lower valve clack further moves leftwards through the second spring, the lower valve clack is enabled to be propped against the right part of the valve seat to form sealing, and meanwhile, the upper valve clack is propped out of the left part of the valve seat by the lower valve clack;

when the valve needs to be manually opened, the sliding switch is manually pushed to move rightwards, the sliding switch drives the valve core to move rightwards through the lock pin, the lower valve clack moves rightwards through the first spring, the lower valve clack is separated from the right part of the valve seat, and all parts reset.

Compared with the prior art, the invention has the technical effects that: because the invention adopts a mechanical movement mode, the temperature control is reliable, and the defect of instability of the traditional magnetic control is avoided; meanwhile, in a high-temperature condition, the spring directly pushes the lower valve clack to realize sealing, other secondary force transmission is not needed, the response speed is high, and the response is stable; and the moving parts in the high-temperature condition are all arranged inside the shell, so that the accident that the moving parts are possibly clamped by other foreign matters when arranged outside is avoided; meanwhile, the problem that the flow resistance of the pipeline is increased due to the existence of a great amount of magnetic conductive dust such as rust in the gas pipeline is solved; the low-temperature alloy forming piece is used as a temperature switch, and response is quick and effective.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a prior art valve open state diagram;

FIG. 2 is a prior art valve closed state diagram;

FIG. 3 is a diagram of the valve opening state of the present invention;

FIG. 4 is a block diagram of the upper valve flap assembly of the present invention;

FIG. 5 is a block diagram of the temperature assembly of the present invention;

FIG. 6 is a slide construction view of the present invention;

FIG. 7 is a close condition diagram of the valve of the present invention when it is over-flowing;

FIG. 8 is a close state diagram of the invention at over temperature;

FIG. 9 is a view of the valve of the present invention in a manually closed position;

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like in the description of the embodiments are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for the purpose of convenience in describing and simplifying the description, and are not intended to indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

As shown in fig. 3, the air valve is an integral structure, and includes an air inlet connector 1, a filter screen 2, a housing 3, a valve seat 4, a lower valve flap 5, a protective sleeve 6, a sliding switch 7, an air outlet connector 8, an upper valve flap guide sleeve 9, an upper valve flap 10, a first spring 11, a second spring 12, a temperature controlled switch 13, a lock pin 14, a third spring 15, and a valve core 16. The filter screen 2 is fixedly connected in an inner cavity of the air inlet joint 1, and the filter screen 2 is arranged between an air inlet of the air inlet joint 1 and the upper valve flap assembly structure and is used for filtering entering air so as to prevent impurities from entering an internal structure; the housing 3 is installed between the inlet connector 1 and the outlet connector 8, and the housing 3 is used for installing an upper valve flap assembly structure (described in detail below), a sliding structure (described in detail below), a valve seat 4, a lower valve flap 5 and the outlet connector 8.

As shown in fig. 4, the upper valve flap assembly structure includes an upper valve flap guide sleeve 9 and an upper valve flap 10. As shown in fig. 3, the upper valve flap guide sleeve 9 is mounted between the air intake fitting 1 and the locating structure of the housing 3; as shown in fig. 4, the right part of the upper valve flap 10 is a barrel part 18 for engaging with the valve seat 4, the upper valve flap 10 further has a rod part 19, the rod part 19 extends from the inner center of the barrel part 18, passes through the center hole of the upper valve flap guide sleeve 9 and extends towards the air inlet joint 1, and the rod part 19 is provided with a fourth spring 20; when the gas flows from left to right, a gas pressure difference is formed between the left and the right of the upper valve clack 10, when the gas pressure difference reaches a design value, the upper valve clack 10 moves to the right against the spring force of the fourth spring 20, and the barrel 18 is further jointed with the valve seat 4 to realize sealing, which is shown in fig. 7.

As shown in fig. 3, the valve seat 4 is mounted between the upper and lower valve flaps 5, which have a central aperture, the valve seat 4 being fixedly mounted on the housing 3; the left part of the central hole is used for being jointed with the cylinder part 18 of the upper valve clack 10, and the right part of the central hole is used for being jointed with the lower valve clack 5; the lower valve clack 5 is arranged on the right side of the valve seat 4, the left side of the lower valve clack 5 is provided with a first spring 11, and the first spring 11 is arranged between the positioning structure of the shell 3 and the lower valve clack 5; the right side of the lower valve clack 5 is provided with a second spring 12; the right side of the second spring 12 is provided with a temperature control assembly structure and a sliding structure. The right part of the lower valve clack 5 is a horn-shaped opening part which is used for being jointed with the right part in the central hole of the valve seat 4, and the left part of the lower valve clack 5 is an ejector rod which can eject the upper valve clack 10 out of the valve seat 4.

As shown in fig. 5, a temperature assembly structure is provided, which includes a temperature controlled switch 13 and a third spring 15, the temperature controlled switch 13 and the third spring 15 are both disposed inside a valve core 16, the third spring 15 is clamped between the positioning structure of the valve core 16 and the temperature controlled switch 13, the temperature controlled switch 13 can be selected as a low temperature alloy molded part, the low temperature alloy molded part can be melted in a short time when reaching a specified temperature, and the low temperature alloy molded part can be melted within 3 seconds when an ambient temperature reaches 85 ℃ ± 5 ℃, at this time, as shown in fig. 8, the third spring 15 loses the limit control and moves to the left, and the third spring 15 directly pushes the lower valve flap 5 to move to the left, so that the horn-shaped opening portion of the lower valve flap 5 is joined with the right portion in the central hole of the valve seat 4 to form a seal. The fusible parts in the prior art are usually made of plastic or glue, and have slow melting time and slow response speed. And the prior art usually adopts an overtemperature spring which is required to be kept for a long time to react after reaching a specified temperature.

As shown in fig. 6, the sliding structure includes a protective sleeve 6, a sliding switch 7, a lock pin 14, and a valve core 16; the spool 16 is disposed on the right side of the second spring 12; the protective sleeve 6 is arranged outside the sliding switch 7 for dust prevention, the sliding switch 7 is provided with a lock pin 14 facing the center of the shell 3, the shell 3 is provided with a directional sliding groove 17, the directional sliding groove 17 is arranged along the axial direction of the shell 3, and the lock pin 14 penetrates through the directional sliding groove 17 and then extends into the valve core 16 so that the sliding switch 7 and the valve core 16 can move synchronously; it will be appreciated that other fasteners may be used for the latch 14. As shown in fig. 3, the air outlet joint 8 is arranged on the right side of the sliding structure, and is positioned by the housing 3 and the sliding switch 7.

When the air valve is used, the air valve has the following states:

1. valve open state in normal use, as shown in fig. 3;

2. in the closed state when the valve is in an overcurrent state, as shown in fig. 7, when the air pressure difference reaches the design value, the upper valve flap 10 will move to the right against the spring force of the fourth spring 20, and the barrel 18 of the upper valve flap 10 is further connected with the valve seat 4 to realize sealing;

3. in the closed state at the time of over-temperature, as shown in fig. 8, at this time, the third spring 15 will lose the limit control and move to the left, and the third spring 15 will push the lower valve flap 5 to move to the left, so that the trumpet-shaped opening part of the lower valve flap 5 is engaged with the right part in the central hole of the valve seat 4 to form a seal;

4. the valve is in a manual closing state, as shown in fig. 9, at this time, the sliding switch 7 is manually pushed to move to the left, the sliding switch 7 drives the valve core 16 to move to the left through the lock pin 14, the lower valve clack 5 is further moved to the left through the second spring 12, the lower valve clack 5 is pushed to the right of the valve seat 4 to form a seal, and meanwhile, the ejector rod of the lower valve clack 5 pushes the upper valve clack 10 out of the valve seat 4;

5. the valve is in a manual opening state, as shown in fig. 3, at this time, the sliding switch 7 is manually pushed to move rightwards, the sliding switch 7 drives the valve core 16 to move rightwards through the lock pin 14, the first spring 11 enables the lower valve clack 5 to move rightwards, the lower valve clack 5 is separated from the right part of the valve seat 4, and all parts are reset.

The air valve adopts a mechanical movement mode, so that the temperature control is reliable, and the defect of instability of the traditional magnetic control is avoided; meanwhile, in a high-temperature condition, the spring directly pushes the lower valve clack to realize sealing, other secondary force transmission is not needed, the response speed is high, and the response is stable; and the moving parts in the high-temperature condition are all arranged in the shell, so that the accident that the moving parts are possibly clamped by other foreign matters when arranged outside is avoided; meanwhile, the problem that the flow resistance of the pipeline is increased due to the existence of a great amount of magnetic conductive dust such as rust in a gas pipeline is solved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An air valve comprises an air inlet joint, a filter screen, a shell, a valve seat, a lower valve clack, an upper valve clack assembly structure, a first spring, a second spring, a temperature assembly structure, a sliding structure and an air outlet joint, wherein the filter screen is fixedly connected in an inner cavity of the air inlet joint, the filter screen is arranged between an air inlet of the air inlet joint and the upper valve clack assembly structure, the shell is arranged between the air inlet joint and the air outlet joint, the valve seat is arranged between the upper valve clack assembly structure and the lower valve clack, the left side of the lower valve clack is provided with the first spring, the right side of the lower valve clack is provided with the second spring, the right side of the second spring is provided with a valve core of the sliding structure, and the valve core can slide in the shell, the temperature assembly structure is arranged in the valve core, and the temperature assembly structure comprises a temperature control switch and a third spring, the third spring is clamped between the positioning structure of the valve core and the temperature control switch, when the temperature exceeds a certain value, the temperature control switch is melted, the third spring loses limit control and moves leftwards, and the third spring directly pushes the lower valve clack to move;

the sliding structure comprises a sliding switch, a fixing piece and a valve core; the sliding switch is provided with a fixing piece facing the center of the shell, the shell is provided with a directional sliding groove, the directional sliding groove is arranged along the axial direction of the shell, and the fixing piece penetrates through the directional sliding groove and then extends into the valve core;

the valve seat has a central bore and is fixedly mounted on the housing.

2. The air valve as recited in claim 1 wherein the upper valve flap assembly structure includes an upper valve flap guide and an upper valve flap, the upper valve flap guide being mounted between the air inlet fitting and the positioning structure of the housing; the right part of the upper valve clack is a cylinder part and is used for being jointed with the valve seat, the upper valve clack is also provided with a rod part, the rod part extends from the center of the inner side of the cylinder part, penetrates through a center hole of the upper valve clack guide sleeve and extends towards the air inlet joint, and a fourth spring is arranged on the rod part.

3. An air valve as claimed in claim 1 wherein a left portion of the central bore is adapted to engage the upper flap and a right portion of the central bore is adapted to engage the lower flap.

4. An air valve as claimed in claim 3 wherein the right side of the valve seat is provided with a lower flap and the left side of the lower flap is provided with a first spring disposed between the locating formation of the housing and the lower flap; and a second spring is arranged on the right side of the lower valve clack.

5. An air valve as claimed in claim 4, characterized in that the right part of the lower valve flap is a flared opening, and the left part of the lower valve flap has a push rod for pushing the upper valve flap out of the valve seat.

6. An air valve as claimed in claim 1 wherein the fixing means is a locking pin.

7. An air valve as claimed in claim 1, wherein the slide switch is externally provided with a protective sleeve.

8. An air valve as claimed in claim 1, wherein the temperature controlled switch is a low temperature alloy molding.