CNG cylinder valve

Abstract

The utility model discloses a compressed natural gas (CNG) cylinder valve which comprises a valve body, a gas inlet is arranged at the lower end of the valve body, a gas outlet is arranged at the left end of the valve body, a hand wheel end is arranged at the right end of the valve body, a valve rod component extending left and right is arranged in the hand wheel end, a ball body and a ball seat sleeved outside the ball body are arranged in the upper end of the valve body, and the left end of the valve rod component is fixedly connected with the right end of the ball body. The valve rod assembly is sleeved with a first pressing cap, the first pressing cap is sleeved with a hand wheel, the hand wheel is fixed to the right end of the valve rod assembly, the center line of the hand wheel end and the center line of the air outlet are located on the same horizontal line, the ball is provided with a first through hole and a second through hole, the first through hole is through front and back, and the second through hole extends left and right. The left end and the right end of the second through hole communicate with the air outlet and the first through hole correspondingly, and the front end and the rear end of the valve body are provided with a safety rupture disk assembly and a fusible alloy safety plug correspondingly. According to the gas cylinder valve, the structure of the gas cylinder valve is simplified, the manufacturing difficulty and cost are reduced, the safety rupture disk assembly and the fusible alloy safety plug are split, and double safety protection is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas cylinder valve technical field, specifically is a CNG gas cylinder valve. BACKGROUND

[0002] As a clean and efficient energy, compressed natural gas (CNG) has been widely used in the field of transportation in recent years. CNG vehicles store natural gas through dedicated gas cylinders and control the flow of gas through the gas cylinder valve to meet the working requirements of the engine. However, the existing CNG gas cylinder valve has some deficiencies in design, which affects its performance, cost and safety.

[0003] In the existing CNG gas cylinder valve, the gas outlet of the ball valve structure is usually not located at the same horizontal plane as the hand wheel end. This design not only increases the manufacturing difficulty and cost, but also brings inconvenience to installation and maintenance. Especially in a small space, the non-horizontal gas outlet design often limits the layout and installation position of the gas cylinder valve, affecting the overall design and performance of the vehicle.

[0004] In addition, the existing CNG gas cylinder valve also has defects in the design of the safety relief end. The commonly used safety relief structure is combined, that is, the fusible alloy and the bursting disc are installed in the same port. Although this combined structure can achieve the function of safety relief to a certain extent, it still has some problems in actual application. For example, when the temperature rises to the melting point of the fusible alloy, the alloy will melt, but under extreme conditions of high temperature, the pressure may not reach the burst requirement of the bursting disc, and the bursting disc may not break timely and effectively, resulting in that the pressure in the bottle cannot be released quickly, thereby increasing the safety hazard. SUMMARY

[0005] In view of the above defects of the prior art, the purpose of the utility model is to provide a CNG gas cylinder valve.

[0006] The technical solution of the utility model is: a CNG gas cylinder valve, comprising a valve body, the lower end of the valve body has an air inlet, the left end of the valve body has a gas outlet, and the right end of the valve body has a hand wheel end. A valve rod assembly extending left and right is installed in the hand wheel end. A ball and a ball seat sleeved outside the ball are installed in the upper end of the valve body. The left end of the valve rod assembly is fixedly connected with the right end of the ball. A first compression cap is sleeved outside the valve rod assembly. A hand wheel is sleeved outside the first compression cap. The hand wheel is fixedly connected with the right end of the valve rod assembly through bolts. The center line of the hand wheel end is on the same horizontal line as the center line of the gas outlet. The ball has a first through hole and a second through hole. The first through hole extends front and back, and the second through hole extends left and right. The left and right ends of the second through hole are respectively communicated with the gas outlet and the first through hole. A safety bursting disc assembly and a fusible alloy safety plug are respectively installed at the front and back ends of the valve body.

[0007] Further, the second pressing cap is fixed on the upper end of the valve body, and the O-ring is arranged between the outer wall of the second pressing cap and the inner wall of the valve body.

[0008] Further, the air inlet is located directly below the ball, and when the hand wheel is rotated along the vertical direction, the hand wheel drives the valve rod assembly to rotate, and the valve rod assembly drives the ball to rotate along the vertical direction, so that the first through hole of the ball can be communicated with the air inlet.

[0009] Further, the safety rupture disc assembly and the fusible alloy safety plug are fixed on the valve body through threaded connection.

[0010] The CNG cylinder valve has the advantages that: the center line of the air outlet and the hand wheel end is designed on the same horizontal line, the structure of the cylinder valve is simplified, the manufacturing difficulty and cost are reduced, the cylinder valve is more convenient to install and maintain, and is especially suitable for a space-limited environment; the safety rupture disc assembly and the fusible alloy safety plug are respectively arranged at the front end and the rear end of the valve body, the combination type of the prior art is changed into a split type, double safety protection is realized, when the pressure in the cylinder abnormally rises or the temperature exceeds the set value, the fusible alloy safety plug melts, the safety rupture disc assembly timely breaks when the preset pressure is reached, the pressure in the cylinder can be rapidly released, and the risk of safety accidents is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a sectional view of the utility model;

[0012] Figure 2 It is another sectional view of the utility model.

[0013] As shown in the figure: 1 - valve body, 101 - air inlet, 102 - air outlet, 103 - hand wheel end, 2 - valve rod assembly, 3 - ball, 301 - first through hole, 302 - second through hole, 4 - ball seat, 5 - first pressing cap, 6 - hand wheel, 7 - bolt, 8 - safety rupture disc assembly, 9 - fusible alloy safety plug, 10 - second pressing cap, 11 - O-ring, 12 - sealing flat gasket. DETAILED DESCRIPTION

[0014] In order to more directly and completely understand the technical scheme of the utility model, the following non-restrictive characteristic description is made in combination with the drawings of the utility model:

[0015] For example, Figure 1 , Figure 2As shown, a CNG cylinder valve includes a valve body 1, with an air inlet 101 at the lower end, an air outlet 102 at the left end, and a handwheel end 103 at the right end. A valve stem assembly 2 extending laterally is installed inside the handwheel end 103. A ball 3 and a ball seat 4 fitted over the ball 3 are installed inside the upper end of the valve body 1. The left end of the valve stem assembly 2 is fixedly connected to the right end of the ball 3. A first pressure cap 5 is fitted over the valve stem assembly 2, and a handwheel 6 is fitted over the first pressure cap 5. The valve stem assembly 2 is fixed to the right end by bolt 7. The center line of the handwheel end 103 is on the same horizontal line as the center line of the air outlet 102. The ball 3 has a first through hole 301 and a second through hole 302. The first through hole 301 is through from front to back, and the second through hole 302 extends from left to right. The left and right ends of the second through hole 302 are respectively connected to the air outlet 102 and the first through hole 301. The valve body 1 is equipped with a safety rupture disc assembly 8 and a fusible alloy safety plug 9 at its front and rear ends, respectively.

[0016] like Figure 1 As shown, a second pressure cap 10 is fixed to the upper end of the valve body 1. The second pressure cap 10 presses against the upper end of the ball seat 4. An O-ring 11 is installed between the outer wall of the second pressure cap 10 and the inner wall of the valve body 1. A sealing gasket 12 is installed between the outer wall of the ball seat 4 and the inner wall of the valve body 1 to achieve a sealing effect.

[0017] The air inlet 101 is located directly below the ball 3. When the handwheel 6 is turned vertically, the handwheel 6 drives the valve stem assembly 2 to rotate, which in turn drives the ball 3 to rotate vertically, allowing the first through hole 301 of the ball 3 to connect with the air inlet 101. Inflation can then be performed. After inflation, the handwheel 6 is turned again... Figure 1 In this state, the CNG cylinder valve is in the closed position. Specifically, after turning handwheel 6 90 degrees, the first through hole 301 is aligned with the air inlet 101.

[0018] The safety rupture disc assembly 8 and the fusible alloy safety plug 9 are both fixed to the valve body 1 by threaded connection, which facilitates disassembly and assembly.

[0019] The CNG cylinder valve provided by this utility model has its outlet 102 and the center line of the handwheel end 103 on the same horizontal line, which simplifies the structure of the cylinder valve and reduces the manufacturing difficulty and cost. This design makes the cylinder valve easier to install and maintain, especially suitable for environments with limited space. The safety rupture disc assembly 8 and the fusible alloy safety plug 9 are respectively installed at the front and rear ends of the valve body 1, changing the existing combined type to a split type, realizing dual safety protection. When the pressure inside the cylinder rises abnormally or the temperature exceeds the set value, the fusible alloy safety plug 9 will melt, and the safety rupture disc assembly 8 will also rupture in time when the preset pressure is reached, ensuring that the pressure inside the cylinder can be released quickly, greatly reducing the risk of safety accidents.

[0020] Of course, the above only is the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any simple modification and equivalent structural change according to the content of the present application specification and drawings should be reasonably included in the patent protection scope of the present application.

Claims

1. A CNG cylinder valve, comprising a valve body, the lower end of the valve body having an inlet, the left end of the valve body having an outlet, and the right end of the valve body having a hand wheel end, characterized in that: The hand wheel end is provided with a left-right extending valve rod assembly, the valve body upper end is provided with a ball and a ball seat sleeved outside the ball, the valve rod assembly left end is fixedly connected with the ball right end, the valve rod assembly is provided with a first compression cap, the first compression cap is provided with a hand wheel, the hand wheel is fixedly connected with the valve rod assembly right end through bolts, the hand wheel end center line is on the same horizontal line with the outlet center line, the ball is provided with a first through hole and a second through hole, the first through hole is front-back extending, the second through hole is left-right extending, and the second through hole left and right ends are respectively communicated with the outlet and the first through hole, the valve body front and back ends are respectively provided with a safety bursting disc assembly and a fusible alloy safety plug.

2. The CNG cylinder valve according to claim 1, characterized in that: The valve body upper end is fixedly provided with a second compression cap, the second compression cap is pressed on the ball seat upper end, an O-ring is arranged between the second compression cap outer wall and the valve body inner wall, and a sealing flat gasket is arranged between the ball seat outer wall and the valve body inner wall.

3. The CNG cylinder valve as claimed in claim 1, wherein: The inlet is located directly below the ball, after rotating the hand wheel along the vertical direction, the hand wheel drives the valve rod assembly to rotate, the valve rod assembly drives the ball to rotate along the vertical direction, so that the ball first through hole is communicated with the inlet.

4. The CNG cylinder valve as claimed in claim 1, wherein: The safety bursting disc assembly and the fusible alloy safety plug are fixed on the valve body through threaded connection.

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