A kind of air supplement device for backflow preventer
A technology of backflow preventer and vent hole, which is applied in the direction of valve device, control valve, function valve type, etc. It can solve the problems of unreasonable setting, no air supplement channel, and difficulty in playing the advantages of backflow preventer, so as to prevent Backflow effect
Active Publication Date: 2020-04-14
TIANJIN GUOWEI FEEDING & DRAINAGE EQUIP MENT MFG
View PDF7 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the air supply device in the middle chamber of the backflow preventer is not set up reasonably or there is no air supply channel at all, which makes it difficult for the backflow preventer to exert its due advantages
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0025] Such as figure 1 As shown, this embodiment proposes an air replenishing device for a backflow preventer, which includes a connecting sleeve 1, one end of which is connected to the middle chamber of the backflow preventer, and the other end is provided with a vent hole 3 communicating with the atmosphere. A seal 2 capable of reciprocating axially along the vent hole 3 is arranged inside, and the seal 2 is used to control the opening and closing of the vent hole 3 .
[0026] The air supply device of the backflow preventer, the movement of the seal 2 can control the on-off of the vent hole 3, when the pressure in the middle cavity of the backflow preventer drops or reaches negative pressure, air needs to be added, and the seal 2 is affected by the negative pressure. Moving towards the middle ch...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an air supplementing device of a backflow preventer, and relates to the technical field of air supplementing devices. The air supplementing device comprises a connecting sleeve, wherein one end of the connecting sleeve is connected with a middle cavity of the backflow preventer; a ventilating hole which communicates with the atmosphere is formed in the other end of the connecting sleeve; and a sealing piece capable of moving along the axial direction of the ventilating hole in a reciprocating manner is arranged in the connecting sleeve, and is used for controlling opening and closing of the ventilating hole. According to the air supplementing device of the backflow preventer, the sealing piece can move to control opening and closing of the ventilating hole, when pressure of the middle cavity of the backflow preventer is reduced or negative, air supplementing is required, under the effect of the negative pressure, the sealing piece moves to the direction of the middle cavity, the ventilating hole communicates with the middle cavity through the connecting sleeve, the sealing piece can timely supplement air for the inside of the middle cavity of the backflow preventer to form an air partition, and therefore, backflow is prevented.
Description
technical field [0001] The invention relates to the technical field of air supply devices, in particular to an air supply device for a backflow preventer. Background technique [0002] The main function of the backflow preventer is to ensure the one-way flow of the medium in the pipeline and prevent backpressure backflow and siphon backflow. The backpressure backflow is the backflow caused by the rise of the outlet pressure and the leakage of the outlet check valve, and the siphon backflow is the drop of the inlet pressure. caused backflow. When the backflow occurs, the drain valve of the backflow preventer opens to discharge part or all of the pressure water in the middle chamber out of the valve body. After the two-stage check valve of the backflow preventer is closed, the middle cavity forms a closed cavity. When the pressure in the middle cavity drops to atmospheric pressure, the water in the cavity is difficult to discharge or the discharge is slow. It is difficult to ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F16K15/06
CPCF16K15/06
Inventor 刘永龚高石
Owner TIANJIN GUOWEI FEEDING & DRAINAGE EQUIP MENT MFG