CN219345593U

CN219345593U - Buoyancy-driven low-pressure gas waterproof check valve

Info

Publication number: CN219345593U
Application number: CN202222953722.1U
Authority: CN
Inventors: 邝岩
Original assignee: Union Committee Of First Branch Of Beijing Gas Group Co ltd
Current assignee: Union Committee Of First Branch Of Beijing Gas Group Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-07-14
Anticipated expiration: 2032-11-07

Abstract

The utility model relates to a buoyancy-driven low-pressure gas waterproof check valve, which comprises a water cavity (1), a floating ball valve core (2), a valve seat sealing surface (3), a gas inlet (5) and a gas outlet (6); the water cavity (1) is used for accumulating water flowing backward and is arranged between the gas inlet (5) and the gas outlet (6), a valve seat sealing surface (3) is arranged at the top of the water cavity (1), and one side of the valve seat sealing surface in the water cavity (1) is connected with the gas inlet (5); the floating ball valve core (2) is arranged in the water cavity (1) and can move up and down in the water cavity, and is movably connected with the valve seat sealing surface (3) for sealing. The utility model adopts buoyancy as a driving signal for opening and closing the valve core, the opening pressure is zero, the closing pressure difference requirement is low, and the valve can be effectively closed when the water pressure is low. The working principle of the utility model is based on the basic condition that water is necessary to invade the gas pipeline when a water blocking accident occurs, and the valve opening and closing control is realized by utilizing the buoyancy effect of the water on the light floating ball valve core.

Description

Buoyancy-driven low-pressure gas waterproof check valve

Technical Field

The utility model relates to a water drain blocking valve for a gas water heater, in particular to a buoyancy-driven low-pressure gas waterproof check valve.

Background

When a user of the gas water heater has an event (water blockage for short) that water flows back into the gas pipe, the water is difficult to control and cannot be predicted as a gas management enterprise. Water blocking accidents can have serious consequences, including: affecting normal air supply; the rush repair workload is large, the recovery time is long, and the great inconvenience is caused to the life of the user.

A one-way valve can be additionally arranged to prevent water blocking accidents. The one-way valve is a common device, a water system, a steam system and a fuel gas transmission and distribution system are used in many cases. For example, when the pressure at the inlet end of the check valve is smaller than the pressure at the outlet end of the check valve, the check valve can close the inlet end to realize the check function, but the check valve can only act when the reverse pressure is larger than a fixed value, has the use limitation, and is generally applicable to single media and is not applicable to dual-phase media. For example, the drain valve can automatically discharge condensed water, air and other non-condensed gases of a steam pipe network and prevent water vapor from leaking, but the drain valve has the functions of ensuring water to pass through and preventing gas from passing through, and obviously cannot be applied to the field.

Disclosure of Invention

The utility model relates to a pipeline accessory for an indoor low-pressure gas pipeline, in particular to a pipeline safety accessory for preventing water blockage faults of a gas pipeline network caused by water backflow.

The utility model adopts buoyancy as a driving signal for opening and closing the valve core, the opening pressure is zero, the closing pressure difference requirement is low, and the valve can be effectively closed when the water pressure is low. The working principle of the utility model is based on the basic condition that water is necessary to invade the gas pipeline when a water blocking accident occurs, and the valve opening and closing control is realized by utilizing the buoyancy effect of the water on the light floating ball valve core.

The utility model provides a buoyancy-driven low-pressure gas waterproof check valve, which comprises a water cavity, a floating ball valve core, a valve seat sealing surface, a gas inlet and a gas outlet;

the water cavity is used for accumulating water flowing backward and is arranged between the gas inlet and the gas outlet, the top of the water cavity is provided with a valve seat sealing surface, and one side of the valve seat sealing surface in the water cavity is connected with the gas inlet;

the floating ball valve core is arranged in the water cavity, can move up and down in the water cavity, and is movably connected with the sealing surface of the valve seat for sealing.

The water cavity is used for accumulating water flowing backward and is used as an action space and a limiting structure of the floating ball valve core, and the interior of the water cavity is smooth and is easy for the floating ball valve core to move up and down. The floating ball valve core is arranged in the water cavity and can move up and down to achieve the effect of closing and opening the valve, and is a core component of the utility model.

Preferably, the water cavity is of a cylindrical structure, so that the floating ball valve core can move up and down conveniently.

The valve seat sealing surface is positioned at the top of the water cavity, and the shape of the valve seat sealing surface is matched with the floating ball valve core to achieve the sealing and closing functions. The area of the valve hole on the sealing surface of the valve seat should be as smaller as possible than the diameter of the floating ball valve core, so that the closing performance of the floating ball valve core is improved by utilizing the effect of the area difference amplified pressure. Therefore, the caliber of the sealing surface of the valve seat is smaller than the diameter of the floating ball valve core.

Preferably, the caliber of the sealing surface of the valve seat is not more than 2/3 of the diameter of the floating ball valve core.

In practical application, the installation angle of the water cavity and the plane is larger than 0 degrees. The floating ball valve core cannot be installed parallel to the horizontal plane, otherwise, the floating ball valve core moves up and down; preferably, the installation angle of the water cavity and the plane is 45-90 degrees.

Wherein, the bottom of water cavity is provided with the drainage mouth. The drain port is positioned at the bottom of the water cavity and is used for draining water after water backflow.

The other end of the gas inlet is connected with an upstream gas pipeline, and the gas inlet is used for being connected with the upstream gas pipeline and leading to a valve hole on the sealing surface of the valve seat.

The side wall of the water cavity, which is connected with one side of the fuel gas outlet, is provided with an opening, and the opening is connected with the fuel gas outlet. The other end of the gas outlet is connected with a downstream gas pipeline. The gas outlet is used for being connected with a downstream gas pipeline and is led out from the bottom of the water cavity.

Drawings

FIG. 1 is a schematic view of a horizontal installation structure of a low-pressure gas waterproof check valve provided by the utility model;

FIG. 2 is a schematic view of a vertical installation structure of the low-pressure gas waterproof check valve provided by the utility model;

in the figure: 1. a water chamber; 2. a floating ball valve core; 3. sealing surface of valve seat; 4. a drain port; 5. a gas inlet; 6. and a fuel gas outlet.

Detailed Description

The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model. One or more different examples of the practice of the utility model are specifically described in light of the foregoing teachings (with reference to the accompanying drawings, in which the description is written).

Examples

According to the technical scheme of the utility model, the buoyancy-driven low-pressure gas waterproof check valve is introduced through two specific embodiments of horizontal installation and vertical installation. A horizontally installed waterproof check valve as shown in fig. 1; a vertically mounted waterproof check valve as shown in fig. 2;

consists of six main parts: the valve consists of a water cavity 1, a floating ball valve core 2, a valve seat sealing surface 3, a drain port 4, a fuel gas inlet 5 and a fuel gas outlet 6.

The water cavity 1 is made of metal materials and is used for accumulating water flowing backward, and is used as an action space and a limiting structure of the floating ball valve core 2, and the interior of the water cavity 1 is smooth and is easy for the floating ball valve core 2 to move up and down.

The floating ball valve core 2 is a movable ball made of light materials, is arranged in the water cavity 1, can move up and down to achieve the effect of closing and opening the valve, and can close the circulation channel when being attached to the valve seat sealing surface (3). The valve seat sealing surface 3 is a special contact surface at the top of the water cavity 1, and the shape of the valve seat sealing surface is matched with the floating ball valve core 2 to achieve the sealing effect. The valve hole area on the valve seat sealing surface 3 is smaller than the diameter of the floating ball valve core 2. The drain port 4 is positioned at the bottom of the water cavity 1, and can discharge the inverted irrigation water after being opened. The gas inlet 5 and the gas outlet 6 are respectively connected with an upstream gas pipeline and a downstream gas pipeline.

The inlet of the utility model is connected to the upstream gas pipeline, the outlet is connected to the downstream gas pipeline, and the valve seat sealing surface is arranged on the gas pipeline in the upper side direction.

During normal operation, the floating ball valve core falls to the bottom of the water cavity under the action of gravity, the valve is opened, and fuel gas freely passes through.

When water back-filling occurs, water will invade the gas line and be collected and accumulated by the water chamber. The water quantity accumulated in the water cavity is continuously increased, the floating ball valve core moves upwards along the direction limited by the inner wall of the water cavity under the action of buoyancy until the floating ball valve core is attached to the sealing surface of the valve seat, and the circulation channel is cut off, so that the valve is closed.

After the water backflow event is eliminated, if the drain port is opened to drain water, water is not existed in the water cavity, the floating ball valve core automatically falls to the bottom of the water cavity under the action of gravity, the valve is opened again, and the fuel gas can pass freely. If the drain is not opened, no more water enters downstream of the outlet, and the pressure is reduced. When the pressure of the fuel gas is reduced below the difference between the upstream pressure and the buoyancy of the floating ball valve core, the upstream fuel gas pushes the floating ball valve core open, continuously pushes the floating ball valve core to the bottom of the water cavity, and simultaneously discharges the water accumulated in the water cavity to the downstream of the outlet. The valve is opened again, and the fuel gas can pass freely.

While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims

1. The buoyancy-driven low-pressure gas waterproof check valve is characterized by comprising a water cavity (1), a floating ball valve core (2), a valve seat sealing surface (3), a gas inlet (5) and a gas outlet (6);

the water cavity (1) is used for accumulating water flowing backward and is arranged between the gas inlet (5) and the gas outlet (6), a valve seat sealing surface (3) is arranged at the top of the water cavity (1), and one side of the valve seat sealing surface in the water cavity (1) is connected with the gas inlet (5);

the floating ball valve core (2) is arranged in the water cavity (1) and can move up and down in the water cavity, and is movably connected with the valve seat sealing surface (3) for sealing.

2. The low-pressure gas-tight non-return valve according to claim 1, characterized in that the water chamber (1) is mounted at an angle of more than 0 ° to the plane.

3. The low-pressure gas-tight non-return valve according to claim 2, characterized in that the water chamber (1) is mounted at an angle of 45 ° to 90 ° to the plane.

4. The low-pressure gas-tight non-return valve according to claim 1, characterized in that the bottom of the water chamber (1) is provided with a drain (4).

5. The low-pressure gas waterproof check valve according to claim 1, characterized in that the other end of the gas inlet (5) is connected to an upstream gas pipe.

6. The low-pressure gas waterproof check valve according to claim 1, characterized in that the water chamber (1) is provided with an opening on the side wall of the side connecting the gas outlet (6), in connection with the gas outlet (6).

7. The low-pressure gas waterproof check valve according to claim 6, characterized in that the other end of the gas outlet (6) is connected to a downstream gas pipe.

8. The low-pressure gas water-proof check valve according to claim 1, characterized in that the caliber of the valve seat sealing surface (3) is smaller than the diameter of the floating ball valve core (2).

9. The low-pressure gas-tight check valve according to claim 8, characterized in that the diameter of the valve seat sealing surface (3) is not greater than 2/3 of the diameter of the float valve core (2).

10. The low-pressure gas-tight check valve according to claim 1, characterized in that the water chamber (1) is of cylindrical structure.