A current-limiting safety valve for liquefied petroleum gas cylinder

Abstract

The utility model discloses a kind of current-limiting safety's liquefied petroleum gas bottle valves, including valve body, hand wheel is installed on valve body upper end, valve body lower end has up and down extending air inlet passage, valve body middle part side has left and right extending air outlet passage, hand wheel lower end is fixedly connected with valve body and is used for the valve assembly of plugging air inlet passage upper end opening and entering, the lower end of valve body is detachably installed with one flow restrictor, flow restrictor includes one cylindrical restrictor main body, restrictor main body has the flow guide passage of up and down through, flow guide passage upper end is communicated with air inlet passage lower end, flow restrictor further includes with the movable petal of the integrally formed restrictor main body lower left end, between movable petal right upper end and restrictor main body lower right end, there is a current-limiting passage, current-limiting passage is communicated with flow guide passage lower end.Flow restrictor simple structure and low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to a liquefied petroleum gas cylinder valve, specifically a liquefied petroleum gas cylinder valve that limits flow and ensures safety. Background Technology

[0002] During the use of liquefied petroleum gas (LPG), carelessness can cause the hose connecting the LPG cylinder to the stove to detach or break, resulting in a sudden and large outflow of LPG. This can potentially lead to fires or explosions. To prevent such a sudden and large outflow of LPG, a flow limiter is needed to restrict the flow and ensure safety. Current flow limiters used on LPG cylinder valves typically include components such as an inlet pipe, inlet connector, steel ball, outlet pipe, and spring, resulting in numerous components and high cost. Therefore, developing a simple and cost-effective LPG cylinder valve is a research direction sought by those in this field. Utility Model Content

[0003] In view of the above-mentioned defects in the prior art, the purpose of this utility model is to provide a liquefied petroleum gas cylinder valve that limits flow and ensures safety.

[0004] The technical solution of this utility model is: a liquefied petroleum gas cylinder valve with flow restriction and safety protection, including a valve body, a handwheel installed at the upper end of the valve body, an air inlet channel extending vertically at the lower end of the valve body, and an air outlet channel extending horizontally on one side of the middle part of the valve body. A valve assembly extending into the valve body and used to block the upper opening of the air inlet channel is fixedly connected to the lower end of the handwheel. A flow limiter is detachably installed at the lower end of the valve body. The flow limiter includes a cylindrical limiter body with a vertically penetrating guide channel inside the limiter body. The upper end of the guide channel is connected to the lower end of the air inlet channel. The flow limiter also includes a movable flap integrally formed with the lower left end of the limiter body. A flow restriction channel is formed between the upper right end of the movable flap and the lower right end of the limiter body. The flow restriction channel is connected to the lower end of the guide channel.

[0005] Furthermore, the right end of the active petal is a free end, which extends to the lower right end of the restrictor body.

[0006] Furthermore, the upper right end of the active petal has a slope, and a flow-limiting channel is formed between the slope and the bottom right end of the limiter body.

[0007] Furthermore, when the hose connected to the stove is pulled apart or broken, a pressure difference is created between the gas cylinder and the hose disconnection point. The right end of the moving valve is pressed upward and contacts the bottom right end of the restrictor body, thus closing the flow restriction channel.

[0008] Furthermore, the bottom surface of the right end of the active petal is a plane.

[0009] Furthermore, the upper end of the flow limiter is connected to the lower end of the valve body via a threaded connection.

[0010] Furthermore, the flow limiter is made of rubber.

[0011] The beneficial effects of the liquefied petroleum gas cylinder valve with flow restriction and safety provided by this utility model are as follows: When the hose connected to the stove is pulled apart or broken, a pressure difference is created between the gas cylinder and the hose disconnection point. This sudden increase in pressure difference will impact the bottom of the movable valve, which is equivalent to generating an upward thrust. Because the right end of the movable valve is the free end, the right end of the movable valve is deformed under pressure, moves upward and contacts the bottom right end of the restrictor body, and the flow restriction channel is closed, thereby preventing a large amount of liquefied petroleum gas from being ejected. This flow restrictor has a simple structure and low manufacturing cost. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] As shown in the figure: 1—valve body, 11—inlet passage, 12—outlet passage, 2—handwheel, 3—valve assembly, 4—flow restrictor, 41—restrictor body, 411—flow guide passage, 42—moving flap, 421—orifice, 5—flow restriction passage. Detailed Implementation

[0014] To provide a more intuitive and complete understanding of the technical solution of this utility model, the following non-limiting features are described in conjunction with the accompanying drawings:

[0015] like Figure 1 As shown, a liquefied petroleum gas cylinder valve for flow restriction and safety includes a valve body 1, a handwheel 2 installed at the upper end of the valve body 1, an air inlet channel 11 extending vertically at the lower end of the valve body 1, and an air outlet channel 12 extending horizontally on one side of the middle of the valve body 1. A valve assembly 3 is fixedly connected to the lower end of the handwheel 2, extending into the valve body 1 and used to block the upper opening of the air inlet channel 11. A flow restrictor 4 is detachably installed at the lower end of the valve body 1. The flow restrictor 4 includes a cylindrical restrictor body 41, and a vertically penetrating guide channel 411 is provided inside the restrictor body 41. The upper end of the guide channel 411 is connected to the lower end of the air inlet channel 11. The flow restrictor 4 also includes a movable flap 42 integrally formed with the lower left end of the restrictor body 41. A flow restriction channel 5 is formed between the upper right end of the movable flap 42 and the lower right end of the restrictor body 41, and the flow restriction channel 5 is connected to the lower end of the guide channel 411.

[0016] The right end of the movable flap 42 is a free end, extending to the lower right end of the restrictor body 41. This structure ensures that the right end of the movable flap 42 is an unrestrained structure, and when its bottom is subjected to pressure impact, this free end can flexibly bend and deform, providing a structural basis for achieving a rapid upward sealing action.

[0017] The upper right end of the active valve 42 has a slope, and the flow-limiting channel 5 is formed between the slope and the lower right bottom surface of the restrictor body 41. Under normal ventilation conditions, the flow-limiting channel 5 formed between the slope and the lower right bottom surface of the restrictor body 41 is the path for the liquefied petroleum gas to flow out.

[0018] When the hose connected to the stove is pulled off or broken, a pressure difference is created between the gas cylinder and the hose disconnection point. The right end of the movable valve 42 is pressed and moves upward, contacting the bottom right end of the restrictor body 41, thus closing the flow restriction channel 5.

[0019] The bottom right end of the movable petroleum valve 42 is flat, providing a vertical impact surface for the ejected liquefied petroleum gas.

[0020] To facilitate the disassembly and replacement of the flow limiter 4, the upper end of the flow limiter 4 is connected to the lower end of the valve body 1 by a threaded connection.

[0021] The flow limiter 4 is made of rubber. The rubber material has good elasticity. Under normal pressure, the movable flap 42 can maintain its original shape to ensure airflow. However, when the hose breaks and a huge pressure difference is generated, it can instantly undergo elastic deformation due to the pressure at the bottom and tilt upwards.

[0022] The liquefied petroleum gas cylinder valve provided by this utility model has a pressure difference between the gas cylinder and the hose disconnection point when the hose connected to the stove is pulled out or broken. This sudden increase in pressure difference will impact the bottom of the movable valve 42, which is equivalent to generating an upward thrust. Because the right end of the movable valve 42 is a free end, the right end of the movable valve 42 is deformed under pressure and moves upward to contact the bottom of the right end of the restrictor body 41, closing the flow restriction channel 5, thereby preventing a large amount of liquefied petroleum gas from being ejected. The flow restrictor 4 has a simple structure and low manufacturing cost.

[0023] The movable flap 42 is provided with a small hole 421 with a small diameter that is connected to the flow guiding channel 411 (the diameter of the small hole 421 is much smaller than that of the flow limiting channel 5). When the hose connected to the stove is pulled off or broken, the movable flap 42 closes the flow limiting channel 5 to prevent a large amount of liquefied petroleum gas from spraying out. At this time, a small amount of liquefied petroleum gas will leak through the small hole 421 with a small diameter. The small leak can be noticed by people. This design is to remind people around to notice that there is a problem with the hose connected to the stove in time.

[0024] Of course, the above are only preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any simple modifications and equivalent structural changes made based on the contents of the present utility model specification and drawings should also be included within the patent protection scope of the present utility model.

Claims

1. A liquefied petroleum gas cylinder valve for flow restriction and safety, comprising a valve body, a handwheel mounted on the upper end of the valve body, an inlet channel extending vertically at the lower end of the valve body, an outlet channel extending horizontally on one side of the middle portion of the valve body, and a valve assembly extending into the valve body and used to block the upper opening of the inlet channel, characterized in that: A flow limiter is detachably installed at the lower end of the valve body. The flow limiter includes a cylindrical limiter body with a vertically penetrating guide channel inside. The upper end of the guide channel is connected to the lower end of the intake channel. The flow limiter also includes a movable flap integrally formed with the lower left end of the limiter body. A flow limiting channel is formed between the upper right end of the movable flap and the lower right end of the limiter body. The flow limiting channel is connected to the lower end of the guide channel.

2. The liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 1, characterized in that: The right end of the active flap is the free end, which extends to the lower right end of the restrictor body.

3. The liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 2, characterized in that: The upper right end of the active petal has a slope, and the flow-limiting channel is formed between the slope and the bottom right end of the limiter body.

4. A liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 2, characterized in that: When the hose connected to the stove is pulled apart or broken, a pressure difference is created between the gas cylinder and the hose disconnection point. The right end of the moving valve is pressed upward and contacts the bottom right end of the restrictor body, thus closing the flow restriction channel.

5. A liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 2, characterized in that: The bottom surface of the right end of the movable petal is a plane.

6. The liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 1, characterized in that: The flow limiter is connected to the lower end of the valve body via a threaded connection at its upper end.

7. A liquefied petroleum gas cylinder valve for flow limiting and safety protection according to claim 1, characterized in that: The flow limiter is made of rubber.

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