Gas valve

Abstract

The utility model provides a gas valve, and belongs to the technical field of valves. The sliding saddle solves the problem that the sliding saddle is inconvenient to operate when an existing gas valve is opened. The gas valve comprises a valve body, a ball core, a valve rod and a hand wheel capable of sliding up and down, the upper end of the valve rod is connected with a driving lever piece in an inserted mode, the driving lever piece and the valve rod are positioned in the circumferential direction, the lower end of the driving lever piece is provided with a protruding block, a spring is arranged between the driving lever piece and a shaft neck part, an annular groove and a notch are formed in the inner hole wall of the shaft neck part, and the notch penetrates through the upper end face of the shaft neck part and is communicated with the annular groove. The protruding block is inserted into the annular groove and can move along the annular groove, the protruding block can further enter the notch through the communication position of the annular groove and the notch and form circumferential positioning, a positioning piece located above the annular groove is fixed in the journal part, and a positioning foot protruding downwards is arranged on the positioning piece. The positioning foot is located on one side of the notch and blocks part of the notch of the annular groove, and the upper end of the shifting rod piece penetrates through the positioning piece and then is fixedly connected with the hand wheel. The gas valve has the opening protection function and is convenient to open at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to a gas valve. Background Technology

[0002] Natural gas is a widely used gaseous fuel. Due to its flammable, explosive, and toxic properties, gas leaks can easily cause major safety accidents. Therefore, gas valves need to be installed in pipelines. In the event of a gas leak or overflow, the gas valve can automatically close, providing overflow protection. Gas valves often also have manual closing and high-temperature shut-off functions to improve safety. This allows users to manually close the valve when not in use, and the automatic high-temperature shut-off function prevents gas leaks from the valve in the event of a building fire.

[0003] For example, a high-temperature shut-off gas valve [Application No.: CN201921491866.1; Authorization Announcement No.: CN 210510411 U] disclosed in Chinese patent literature includes a valve body. One end of the valve body's inner wall is threadedly connected to a valve cap. A valve stem is rotatably connected to the inner wall of the valve body, extending through and to the top of the valve body. A sealing seat is fixedly connected to the inner wall of the valve body, and a valve ball is rotatably connected to the inner wall of the sealing seat. The valve stem is fixedly connected to the top of the valve ball. The valve ball has a through hole inside, and a first bracket is fixedly connected to the inner wall of the through hole. A core is movably inserted into the inner wall of the first bracket, and a sealing sheet is fixedly connected to the surface of the core. A second spring is movably fitted to the inner wall of the first bracket, and the second spring is sleeved on the surface of the core. A second bracket is threadedly connected to the inner wall of the other end of the valve body. A plug is welded to the second bracket near the valve ball using a low-melting-point metal. A third spring is provided between the second bracket and the plug, with both ends of the third spring abutting against the second bracket and the plug, respectively. A handle is slidably connected to the top of the valve stem. A first spring is also fitted on the valve stem to push the handle upward. A protrusion is provided on the top of the valve stem. A groove is provided at the bottom of the handle for the protrusion to be inserted after the handle is moved down. The size of the protrusion is equal to the size of the groove. An O-ring is provided between the surface of the valve stem and the inner wall of the valve body.

[0004] When the gas valve described above is in use, if the gas flow rate entering the valve body's inlet is too high, it will cause the sealing plate to move towards the outlet end of the valve ball, thereby closing the gas valve and achieving overcurrent protection. The first bracket, core, and second spring constitute the overcurrent shut-off valve core. The low-melting-point metal weld between the second bracket and the plug's connecting rod is a high-temperature cut-off structure. When the temperature is too high, this metal melts, causing the second bracket and the plug to separate. Under the action of the third spring, the plug's end cap fits against the inlet in the middle of the valve body, thereby preventing gas from entering the inlet and achieving high-temperature cut-off protection. To open the valve, press the handle downwards to engage the handle's groove with the valve stem's locking block, and then turn the valve core to achieve the opening protection.

[0005] Because ordinary ball valves can be opened simply by turning the handle, users often instinctively turn the handle directly when opening the aforementioned gas valve due to habit. This causes the groove on the handle to misalign with the locking block on the valve stem. When the handle is then pressed down, the locking block often fails to align and engage in the groove. Users must then turn the handle while pressing down to allow the locking block to engage before the valve stem can be turned to open the valve. Furthermore, the handle can be turned in two directions when opening the gas valve. If the user turns it in the wrong direction, the overcurrent cut-off valve core will be facing the wrong direction, thus failing to provide overcurrent protection. Therefore, users need to pay extra attention to the rotation markings on the handle when turning it. Consequently, the operation of opening the aforementioned gas valve is inconvenient. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a gas valve that solves the technical problem of how to make the gas valve convenient to open while having opening protection.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A gas valve includes a valve body with a journal, a ball core disposed therein, a valve stem passing through the journal, the lower end of the valve stem connected to the ball core, and a handwheel that can slide up and down connected to the upper end of the valve stem. An overcurrent shut-off valve core is installed in the ball core. The valve stem is characterized by having a lever inserted into the upper end of the valve stem for circumferential positioning. A protruding bump is present on the outer surface of the lower end of the lever. A spring located below the lever is disposed between the lever and the journal. An annular groove and a notch are formed on the inner wall of the journal. The notch penetrates the upper end face of the journal and communicates with the annular groove. The bump is inserted into the annular groove and can move along it. The bump can also enter the notch through the connection between the annular groove and the notch, forming circumferential positioning. A positioning plate is fixed inside the journal above the annular groove. The positioning plate has a downwardly protruding positioning foot located on one side of the notch and blocking part of the annular groove opening. The upper end of the lever passes through the positioning plate and is fixedly connected to the handwheel.

[0009] When the gas valve is closed, the protrusion is embedded in the notch and abuts against the positioning plate under the action of the spring. At this time, the two sides of the protrusion are limited by the walls of the notch and cannot move circumferentially. That is, the protrusion forms a circumferential positioning in the notch, and the handwheel cannot be rotated, thus achieving the opening protection. When it is necessary to open the gas valve, press the handwheel down. The handwheel and the lever move downward. The protrusion on the lever disengages from the notch and enters the annular groove. Then, rotate the handwheel. The protrusion moves in the annular groove. The valve stem rotates with the handwheel and opens the ball core. Since the positioning foot is located on one side of the notch and blocks the opening of the annular groove, the protrusion can only move away from the positioning foot, avoiding the ball core from rotating in the wrong direction and causing the overflow cut-off valve core to fail. When it is necessary to close the gas valve, rotate the handwheel in the opposite direction so that the protrusion abuts against the positioning foot. Release the handwheel. Under the action of the spring, the protrusion rises and inserts into the notch. At this time, the handwheel cannot be rotated directly without being pressed down. The design of the protrusions, notches, and positioning plates enables opening protection. Furthermore, the notches and positioning feet have an anti-misoperation function. When opening the gas valve, the user only needs to press down the handwheel and then turn it, making the opening operation convenient.

[0010] In the aforementioned gas valve, the outer edge of the positioning plate has a protruding lug that fits into a notch. The lug fitting into the notch allows the positioning plate to be circumferentially positioned within the journal, which helps ensure the anti-misalignment function of the positioning foot and facilitates easy opening of the gas valve.

[0011] In the aforementioned gas valve, there are two protrusions symmetrically arranged on the lever, and two notches corresponding to the two protrusions. This ensures that when the user instinctively turns the handwheel to open the gas valve, both protrusions bear force, thus distributing the force and reducing the possibility of protrusion deformation, thereby improving the service life of the lever.

[0012] In the aforementioned gas valve, there are two positioning feet symmetrically arranged on the positioning plate, and two lugs symmetrically arranged on the positioning plate. This disperses the force, reduces the possibility of deformation of the lugs and positioning feet, and helps to improve the service life of the positioning plate.

[0013] In the aforementioned gas valve, the inner wall of the journal has a limiting surface located above the annular groove and facing upwards. A retaining ring located above the limiting surface is also engaged on the inner wall of the journal. The positioning piece is axially limited between the limiting surface and the retaining ring.

[0014] When assembling the positioning plate, first insert the spring into the journal and fit it onto the valve stem. Then, insert the lever into the journal to form a connection with the valve stem, with the protrusion embedded in the notch. Next, insert the positioning plate with the positioning feet facing down into the journal, with the lug embedded in the notch. Then, snap the retaining ring into the journal. The upper end of the lever extends out from the positioning plate and connects to the handwheel, making assembly convenient.

[0015] In the aforementioned gas valve, an indicator arrow is provided on the outer surface of the valve body to indicate the gas flow direction. This reduces the likelihood of users reversing the gas valve's inlet and outlet during installation, thus minimizing overcurrent protection failure caused by incorrect installation.

[0016] In the gas valve described above, a high-temperature shut-off valve core is fixed inside the air inlet end of the valve body.

[0017] The high-temperature shut-off valve core includes a bracket fixedly connected to the valve body. A sealing core facing the ball core is inserted into the bracket. An emergency spring is installed between the sealing core and the bracket. The sealing core and the bracket are fixed together by welding with a low-melting-point metal. A raised ring is located on the inner wall of the valve body between the sealing core and the ball core. The sealing core can form a seal by abutting against the raised ring after the low-melting-point metal melts. The low-melting-point metal, such as a tin-bismuth alloy or a lead-tin-bismuth alloy, has a melting point of 95°C ± 5°C. When a fire occurs in the building and the gas valve reaches its melting point, the low-melting-point metal melts, the sealing core is released from its fixed state with the bracket, and under the action of the emergency spring, the sealing core pops out and abuts against the raised ring of the valve body to form a seal, achieving automatic high-temperature shut-off and providing high-temperature protection.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The design of the protrusions, notches, and positioning plates enables opening protection. The notches and positioning feet also have an anti-misoperation function. When opening the gas valve, the user only needs to press down the handwheel and then turn it. The opening operation is convenient. In addition, the positioning plates and levers are easy to install. Attached Figure Description

[0020] Figure 1 This is a perspective view of the gas valve in Embodiment 1 when it is turned on.

[0021] Figure 2 This is a cross-sectional view of the gas valve in Embodiment 1 when it is open.

[0022] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0023] Figure 4 This is a cross-sectional view of the gas valve in Embodiment 1 when it is closed.

[0024] Figure 5 yes Figure 4 A cross-sectional view along the BB direction.

[0025] Figure 6 This is an exploded view of Embodiment 1 of this gas valve.

[0026] Figure 7This is a perspective view of the disassembled journal, positioning plate, and lever of the first embodiment of this gas valve.

[0027] In the diagram, 1. Valve body; 1a. Journal neck; 1a1. Annular groove; 1a2. Notch; 1a3. Limiting surface; 1a4. Slot; 1b. Inlet end; 1c. Outlet end; 1d. Indicator arrow; 2. Ball core; 3. Valve stem; 4. Overcurrent shut-off valve core; 5. High temperature shut-off valve core; 6. Toggle lever; 6a. Protrusion; 7. Spring; 8. Positioning plate; 8a. Positioning foot; 8b. Lug; 9. Snap ring; 10. Handwheel. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, a gas valve includes a valve body 1 with a journal 1a. The left end of the valve body 1 is an inlet end 1b, and the right end is an outlet end 1c. The journal 1a is located on the upper side wall of the valve body 1. An indicator arrow 1d for indicating the gas flow direction is provided on the outer surface of the valve body 1, pointing from the inlet end 1b to the outlet end 1c. A ball core 2 is provided in the valve body 1, and a valve stem 3 passes through the journal 1a. The lower end of the valve stem 3 is connected to the ball core 2, and the upper end of the valve stem 3 is connected to a sliding handwheel 10. An overcurrent shut-off valve core 4 is installed in the ball core 2. The structure of the overcurrent shut-off valve core 4 can be referred to in the patent document with publication number CN210510411U, and will not be described in detail here. The overcurrent shut-off valve core 4 can realize overcurrent protection. A high-temperature shut-off valve core 5 is fixed inside the air inlet end 1b of the valve body 1. The high-temperature shut-off valve core 5 includes a bracket fixedly connected in the valve body 1. A sealing core facing the ball core 2 is inserted on the bracket. An emergency spring is provided between the sealing core and the bracket. The sealing core and the bracket are fixed together by welding with a low-melting-point metal. A convex ring is provided on the inner wall of the valve body 1 between the sealing core and the ball core 2. The sealing core can abut against the convex ring to form a seal after the low-melting-point metal melts. The structure of the high-temperature shut-off valve core 5 can also be referred to in the patent document with publication number CN210510411U.

[0031] like Figure 2 and Figure 3 As shown, a lever 6, circumferentially positioned with the valve stem 3, is inserted into the upper end of the valve stem 3. The lower outer surface of the lever 6 has two protruding protrusions 6a, arranged symmetrically. (Combined with...) Figure 4 and Figure 5As shown, the upper end of the valve stem 3 has a slot, and the lever 6 is inverted T-shaped with its lower end inserted into the slot for circumferential fixation. The lever 6 can slide up and down within the slot. A spring 7 is provided between the lever 6 and the journal 1a. The spring 7 is located below the lever 6, with its upper end abutting against the lower end face of the lever 6 and its lower end abutting against the step of the journal 1a. Figure 6 and Figure 7 As shown, the inner wall of the journal 1a has an annular groove 1a1 and a notch 1a2. The notch 1a2 penetrates the upper end face of the journal 1a and communicates with the annular groove 1a1. The notch 1a2 also penetrates the outer circumferential surface of the journal 1a. There are two notches 1a2, which are symmetrically arranged. The two notches 1a2 correspond one-to-one with two protrusions 6a. The protrusions 6a are inserted into the annular groove 1a1 and can move along the annular groove 1a1. The protrusions 6a can also enter the notch 1a2 through the connection between the annular groove 1a1 and the notch 1a2 and form a circumferential positioning. The circumferential width of the notch 1a2 is equal to or slightly less than the circumferential width of the protrusions 6a. When the protrusions 6a are moved in the annular groove 1a1 to be opposite the notch 1a2, the upper part of the protrusions 6a enters the notch 1a2 under the action of the spring 7. After entering the notch 1a2, the protrusions 6a are circumferentially positioned by the two side walls of the notch 1a2. A positioning piece 8 is fixed inside the journal 1a, located above the annular groove 1a1. The positioning piece 8 has downwardly bent and protruding positioning feet 8a, which are located on one side of the notch 1a2 and partially block the opening of the annular groove 1a1. The outer edge of the positioning piece 8 has protruding lugs 8b, which are embedded in the notch 1a2. There are two positioning feet 8a symmetrically arranged on the positioning piece 8, and two lugs 8b symmetrically arranged on the positioning piece 8. Each lug corresponds one-to-one with one of the two notches 1a2. Figure 3 and Figure 7 As shown, the inner wall of the journal 1a has a limiting surface 1a3 positioned above the annular groove 1a1 and facing upwards. A retaining ring 9 positioned above the limiting surface 1a3 is also engaged on the inner wall of the journal 1a. The positioning piece 8 is axially limited between the limiting surface 1a3 and the retaining ring 9. A retaining groove 1a4 is formed on the inner wall of the journal 1a, and the outer edge of the retaining ring 9 is embedded in the retaining groove 1a4. The upper end of the lever 6 passes through the positioning piece 8 and is fixedly connected to the handwheel 10. A fastening fitting is provided on the handwheel 10, and the upper end of the lever 6 is inserted into the fastening fitting to form a tight fit.

[0032] like Figure 4 As shown, when the gas valve is closed, the protrusion 6a is embedded in the notch 1a2 and abuts against the positioning piece 8 under the action of the spring 7. At this time, the two sides of the protrusion 6a are limited by the two side walls of the notch 1a2 and cannot move circumferentially, that is, the handwheel 10 cannot be rotated, thus achieving the opening protection. When it is necessary to open the gas valve, combined with... Figure 2As shown, pressing the handwheel 10 downwards causes the handwheel 10 and lever 6 to move downwards. The protrusion 6a on the lever 6 disengages from the notch 1a2 and enters the annular groove 1a1. Then, rotating the handwheel 10 causes the protrusion 6a to move within the annular groove 1a1. The valve stem 3 rotates with the handwheel 10, opening the ball core 2. Because the positioning foot 8a is located on one side of the notch 1a2 and blocks the opening of the annular groove 1a1, the protrusion 6a can only move in one direction, preventing the ball core 2 from rotating in the wrong direction and causing the overcurrent cut-off valve core 4 to fail. When it is necessary to close the gas valve, rotating the handwheel 10 in the opposite direction causes the protrusion 6a to abut against the positioning foot 8a. Releasing the handwheel 10 causes the protrusion 6a to rise and insert into the notch 1a2 under the action of the spring 7. The opening protection can be achieved by setting the protrusion 6a, the notch 1a2 and the positioning piece 8. Moreover, the notch 1a2 and the positioning foot 8a have the function of preventing incorrect opening. When the gas valve is opened, the user only needs to press down the handwheel 10 and then turn the handwheel 10, which makes the opening operation convenient.

[0033] Example 2

[0034] In Embodiment 1, the retaining ring 9 and the retaining groove 1a4 are eliminated, and the fixing piece is fixed to the journal 1a by welding. Specifically, the lug 8b is embedded in the notch 1a2 and fixed to the journal 1a by welding. Other structures are the same as in Embodiment 1.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A gas valve comprising a valve body (1) having a journal (1a), wherein a ball core (2) is disposed in the valve body (1), a valve stem (3) is disposed in the journal (1a), the lower end of the valve stem (3) is connected to the ball core (2), a handwheel (10) slidably connected to the upper end of the valve stem (3), and an overcurrent shut-off valve core (4) is installed in the ball core (2), characterized in that, The upper end of the valve stem (3) is inserted with a lever (6) that is circumferentially positioned with the valve stem (3). The outer surface of the lower end of the lever (6) has a protruding protrusion (6a). A spring (7) located below the lever (6) is provided between the lever (6) and the journal (1a). The inner wall of the journal (1a) is provided with an annular groove (1a1) and a notch (1a2). The notch (1a2) penetrates the upper end face of the journal (1a) and communicates with the annular groove (1a1). The protrusion (6a) is inserted into the annular groove (1a1) and can move along the annular groove. The groove (1a1) moves, and the protrusion (6a) can also enter the notch (1a2) through the connection between the annular groove (1a1) and the notch (1a2) and form circumferential positioning. The journal (1a) is fixed with a positioning piece (8) located above the annular groove (1a1). The positioning piece (8) has a downward protruding positioning foot (8a). The positioning foot (8a) is located on one side of the notch (1a2) and blocks part of the groove of the annular groove (1a1). The upper end of the lever (6) passes through the positioning piece (8) and is fixedly connected to the handwheel (10).

2. The gas valve according to claim 1, characterized in that, The positioning piece (8) has a protruding lug (8b) on its outer edge, which is embedded in the notch (1a2).

3. The gas valve according to claim 2, characterized in that, There are two protrusions (6a) and they are symmetrically arranged on the lever (6). There are two notches (1a2) and they are arranged one-to-one with the two protrusions (6a).

4. The gas valve according to claim 3, characterized in that, There are two positioning feet (8a) symmetrically arranged on the positioning piece (8), and there are two lugs (8b) symmetrically arranged on the positioning piece (8).

5. The gas valve according to any one of claims 1-4, characterized in that, The inner wall of the journal (1a) has a limiting surface (1a3) located above the annular groove (1a1) and facing upward. The inner wall of the journal (1a) is also fitted with a retaining ring (9) located above the limiting surface (1a3). The positioning piece (8) is axially limited between the limiting surface (1a3) and the retaining ring (9).

6. The gas valve according to any one of claims 1-4, characterized in that, The outer surface of the valve body (1) is provided with an indicator arrow (1d) for indicating the direction of gas flow.

7. The gas valve according to any one of claims 1-4, characterized in that, A high-temperature shut-off valve core (5) is fixed inside the air inlet end (1b) of the valve body (1).

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