CN218152509U - Cock backflow preventing mechanism - Google Patents

Abstract

The utility model discloses a cock backflow prevention mechanism, which comprises a fluid inlet pipeline and a fluid outlet pipeline which are arranged on the valve shell of the cock valve, wherein the fluid inlet pipeline and the fluid outlet pipeline are arranged horizontally, and the height of the fluid inlet pipeline is higher than that of the fluid outlet pipeline; the valve comprises a valve body, a valve core and a valve rod, wherein the valve core is integrally arranged at the lower end of the valve rod positioned in the valve shell, a bent channel is arranged on the valve core, one channel port of the bent channel is matched with a pipeline port of a fluid inlet pipeline, which faces the valve core, and the other channel port of the bent channel is matched with a pipeline port of a fluid outlet pipeline, which faces the valve core; the plug backflow prevention mechanism further comprises a backflow prevention ball body arranged in the curved channel, the ball diameter of the backflow prevention ball body is smaller than the diameter of the curved channel, and the upper end of the backflow prevention ball body is hinged to the inner wall of the curved channel. The utility model discloses can slow down the time of refluence, prevent that the refluence spheroid resets owing to the spring action behind dead weight or the setting spring, plays and blocks up crooked passageway, prevents the effect of refluence.

Description

Cock backflow preventing mechanism

Technical Field

The utility model relates to a cock backflow preventing mechanism.

Background

In present urban water supply network, urban water supply pipeline often uses the plug valve to open and close, but the plug valve structure that uses among the prior art is fairly simple, if when urban water supply low reaches pressure is greater than the urban water supply upper reaches, takes place to pollute the refluence condition, and ordinary plug valve does not have the effect of anti-backflow. Even if some backflow prevention mechanisms arranged in the plug valve are arranged on the market, the backflow prevention effect is general.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a cock prevents flow reversal mechanism, realizes blockking up the crooked passageway in the valve casing through preventing that the articulated back of flowing backwards spheroid realizes preventing flowing backwards. The principle of trap, linker is used for reference to crooked passageway, even the water pressure that the fluid outlet passageway department appears is greater than the water pressure of fluid inlet passageway department like this, also can slow down the time of refluence (indicate the refluence to reach the time of preventing flowing backwards spheroid department), prevent flowing backwards spheroid like this because dead weight or set up the spring after because elasticity effect resets, play and block up crooked passageway, prevent the effect of refluence.

In order to achieve the purpose, the technical scheme of the utility model is to design a cock backflow prevention mechanism, which comprises a fluid inlet pipeline and a fluid outlet pipeline which are arranged on the valve shell of the cock valve, wherein the fluid inlet pipeline and the fluid outlet pipeline are both integrated with the valve shell, the fluid inlet pipeline and the fluid outlet pipeline are both horizontally arranged, and the height of the fluid inlet pipeline is higher than that of the fluid outlet pipeline;

the plug backflow prevention mechanism further comprises a valve rod, one part of the valve rod is located in the valve shell, a valve core is integrally arranged at the lower end of the valve rod located in the valve shell, a bent channel is arranged on the valve core, one channel port of the bent channel is matched with a pipeline port of the fluid inlet pipeline facing the valve core, and the other channel port of the bent channel is matched with a pipeline port of the fluid outlet pipeline facing the valve core;

the cross section of each central line of the curved channel is in a circular shape with the same diameter; the plug backflow prevention mechanism further comprises a backflow prevention ball body arranged in the curved channel, the ball diameter of the backflow prevention ball body is smaller than the diameter of the curved channel, the upper end of the backflow prevention ball body is hinged to the inner wall of the curved channel, and a rubber sealing gasket exceeding the spherical surface and used for blocking the curved channel is fixedly arranged on the backflow prevention ball body. The principle of a trap and a communicating vessel is used for reference in the curved channel, so that even if the water pressure at the fluid outlet channel is larger than the water pressure at the fluid inlet channel, the backflow time (the time for the backflow to reach the backflow-preventing ball body) can be reduced, and the backflow-preventing ball body is reset due to self weight or the elastic force after a spring is arranged, so that the curved channel is blocked and the backflow is prevented; one end of the valve rod, which exceeds the valve shell, is fixedly connected with a rotating handle or a rotating hand wheel for controlling the rotation of the valve rod so as to realize that the bent channel in the valve core is communicated or not communicated with the fluid inlet pipeline and the fluid outlet pipeline, thereby playing the role of opening and closing the plug valve. In the scheme, the backflow-preventing ball is adopted, so that the function of blocking the bent channel can be realized when the valve rod rotates to a completely closed position (the completely opened position is that the channel port of the bent channel of the valve core is not completely aligned with the pipeline ports of the fluid inlet pipeline and the fluid outlet pipeline; and the completely closed position is that the channel port of the bent channel of the valve core is not communicated with the pipeline ports of the fluid inlet pipeline and the fluid outlet pipeline at any point) (when the water pressure at the outlet is higher than that at the inlet). In addition, due to the hinged relationship, when the water pressure at the position where the fluid enters the pipeline is lower than that at the position where the fluid exits the pipeline, the backflow-preventing ball body rotates due to the self-weight (the backflow-preventing ball body rotates towards the position where the fluid exits the pipeline at the beginning because the water pressure at the position where the fluid enters the pipeline is higher than that at the position where the fluid exits the pipeline), and the function of blocking the bent channel is achieved.

The further technical scheme is that two channel ports of the curved channel are higher than one another and lower than one another, and the channel port at the higher side of the curved channel is matched with a pipeline port of the fluid entering a pipeline and facing the valve core; the fluid inlet pipeline and the fluid outlet pipeline are both in a circular hole shape, and the aperture of the fluid inlet pipeline is the same as that of the fluid outlet pipeline;

the wall of the fluid inlet pipeline is fixedly provided with a stop block for stopping the backflow-preventing ball from rotating towards the inlet direction of the fluid inlet pipeline. The setting of dog is avoided fluid outflow pipeline department water pressure to be greater than the water pressure that the fluid got into the pipeline and is made the anti-backflow spheroid rotate to opposite direction also to the entry direction that the fluid got into the pipeline, can not play the effect of jam on the contrary, makes the anti-backflow spheroid can not rotate the weight line after the dog sets up, guarantees to block up crooked passageway, guarantees to prevent the effect of refluence.

The technical scheme is that one side of the backflow-preventing ball body, which is far away from the check block, is fixedly connected with a spring, and the other end of the spring is fixedly connected to the inner wall of the bent channel. The spring is preferably a compression spring, so that once the water pressure at the fluid inlet is smaller than that at the fluid outlet, the backflow prevention ball can immediately rotate to the position of a weight line under the action of the self weight of the backflow prevention ball and the pressure of the compression spring to block the bent channel and close the communication condition between the bent channel of the valve core and the fluid inlet pipeline and the fluid outlet pipeline.

The further technical proposal is that the upper side and the lower side of the valve core are provided with sealing rings fixedly connected with the valve rod; or the upper side and the lower side of the valve core are provided with filling materials positioned in the valve shell.

The further technical scheme is that a groove is arranged at the lower end of the backflow-preventing ball body, and a rubber sealing gasket is fixedly arranged in the groove. The rubber sealing gasket is slightly higher than the spherical surface of the backflow-preventing sphere; therefore, the function of blocking the bent channel can be realized when the backflow-preventing ball body is reset due to self weight or elastic force. More preferred is: the upper end of the backflow-preventing sphere is also provided with a groove, but the groove at the upper end is an annular groove (aiming at avoiding a hinge shaft { the backflow-preventing sphere is hinged on the inner wall of the curved channel through the hinge shaft }), an annular rubber ring is fixedly arranged in the annular groove, and the end face of the annular rubber ring is slightly higher than the spherical surface of the backflow-preventing sphere.

The utility model has the advantages and the beneficial effects that: the bent channel refers to the principles of a water trap and a communicating vessel, so that even if the water pressure at the fluid outlet channel is larger than that at the fluid inlet channel, the backflow time (the time for backflow to reach the backflow-preventing ball body) can be slowed down, and the backflow-preventing ball body is reset due to self weight or the elastic force after a spring is arranged, so that the bent channel is blocked and backflow is prevented;

the setting of dog is avoided fluid outflow pipeline department water pressure to be greater than the water pressure that the fluid got into the pipeline and is made the anti-backflow spheroid rotate to opposite direction also to the entry direction that the fluid got into the pipeline, can not play the effect of jam on the contrary, makes the anti-backflow spheroid can not rotate the plumb line, guarantees to block up crooked passageway, guarantees the anti-backflow effect.

The rubber sealing gasket is slightly higher than the spherical surface of the backflow-preventing sphere; therefore, the function of blocking the bent channel can be realized when the backflow-preventing ball body is reset due to self weight or elastic force.

Drawings

FIG. 1 is a schematic view of a faucet anti-backup mechanism of the present invention;

FIG. 2 is a cross-sectional view of the upper end of FIG. 1;

FIG. 3 is a cross-sectional view of the lower end of FIG. 1;

FIG. 4 is a schematic view of the interior of the tortuous path of FIG. 3;

fig. 5 is a schematic view of another operating state of fig. 4.

In the figure: 1. a valve housing; 2. a fluid inlet conduit; 3. a fluid outflow conduit; 4. a valve stem; 5. a valve core; 6. a curved channel; 7. a backflow prevention ball body; 8. a stopper; 9. a spring.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 5 (for convenience of illustration, the backflow prevention ball, the stopper and the spring are not shown in fig. 3), the present invention is a plug backflow prevention mechanism, which comprises a fluid inlet pipe 2 and a fluid outlet pipe 3 which are arranged on a valve housing 1 of a plug valve, wherein the fluid inlet pipe 2 and the fluid outlet pipe 3 are both integrated with the valve housing 1, the fluid inlet pipe 2 and the fluid outlet pipe 3 are both horizontally arranged, and the height of the fluid inlet pipe 2 is higher than that of the fluid outlet pipe 3; the plug backflow prevention mechanism further comprises a valve rod 4, a part of the valve rod 4 is located in the valve casing 1, a valve core 5 is integrally arranged at the lower end of the valve rod 4 located in the valve casing 1, a bent channel 6 is arranged on the valve core 5, one channel port of the bent channel 6 is matched with a pipeline port of the fluid inlet pipeline 2 facing the valve core 5, and the other channel port of the bent channel 6 is matched with a pipeline port of the fluid outlet pipeline 3 facing the valve core 5; the cross section of each central line of the curved channel 6 is in a circular shape with the same diameter; the plug backflow prevention mechanism further comprises a backflow prevention ball body 7 arranged in the curved channel 6, the diameter of the backflow prevention ball body 7 is slightly smaller than the diameter of the curved channel 6, and the upper end of the backflow prevention ball body 7 is hinged to the inner wall of the curved channel 6. Two channel ports of the curved channel 6 are higher than one other and lower than one other, and the channel port at the higher part of the curved channel 6 is matched with the channel port of the fluid inlet pipeline 2 facing the valve core 5; the fluid inlet pipeline 2 and the fluid outlet pipeline 3 are both in a circular hole shape, and the aperture of the fluid inlet pipeline 2 is the same as that of the fluid outlet pipeline 3; the wall of the fluid inlet pipeline 2 is fixedly provided with a stop block 8 for stopping the backflow-preventing ball 7 from rotating towards the inlet direction of the fluid inlet pipeline 2. One side of the backflow-preventing ball 7, which is far away from the stop block 8, is fixedly connected with a spring 9, and the other end of the spring 9 is fixedly connected to the inner wall of the curved channel 6. The upper side and the lower side of the valve core 5 are provided with sealing rings fixedly connected with the valve rod 4; the lower end of the backflow-preventing ball body 7 is provided with a groove, and a rubber sealing gasket is fixedly arranged in the groove. The spheroidal upper end that prevents flowing backwards also is equipped with the groove, but the groove of upper end is the annular (the purpose is in order to avoid the articulated shaft { prevent flowing backwards the spheroid and articulate on crooked passageway inner wall through the articulated shaft }), the annular internal fixation is equipped with annular rubber circle, its terminal surface of annular rubber circle is also a little more than prevents flowing backwards spheroidal sphere surface (prevent flowing backwards its diameter of sphere on the spheroid and be slightly less than crooked passageway's diameter, be convenient for like this prevent flowing backwards spheroidal rotation, and the setting of annular rubber circle and rubber packing pad of deuterogamying, can play the effect of blockking up crooked passageway when preventing flowing backwards the spheroid is vertical).

The working principle is as follows:

after the valve rod rotates to the curved channel in the valve core and is communicated with the fluid inlet pipeline and the fluid outlet pipeline, because the water pressure at the fluid inlet pipeline is greater than the water pressure at the fluid outlet pipeline under the normal condition, the backflow-preventing ball rotates towards the fluid outlet pipeline due to the relation of the water pressure, the state is shown in figure 5, when the water pressure at the fluid inlet pipeline is less than the water pressure at the fluid outlet pipeline, the spring plays a role at the moment, the backflow-preventing ball resets, until the backflow-preventing ball abuts against the stop block, the backflow-preventing function of blocking the curved channel is realized, and the structure is shown in figure 4.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the technical principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.

Claims (5)

1. A cock backflow prevention mechanism is characterized by comprising a fluid inlet pipeline and a fluid outlet pipeline which are arranged on a valve shell of a cock, wherein the fluid inlet pipeline and the fluid outlet pipeline are integrated with the valve shell, the fluid inlet pipeline and the fluid outlet pipeline are horizontally arranged, and the height of the fluid inlet pipeline is higher than that of the fluid outlet pipeline;

the plug backflow prevention mechanism further comprises a valve rod, one part of the valve rod is located in the valve shell, a valve core is integrally arranged at the lower end of the valve rod located in the valve shell, a bent channel is arranged on the valve core, one channel opening of the bent channel is matched with a pipeline opening of the fluid inlet pipeline, facing the valve core, and the other channel opening of the bent channel is matched with a pipeline opening of the fluid outlet pipeline, facing the valve core;

the cross section of each central line of the curved channel is in a circular shape with the same diameter; the plug backflow prevention mechanism further comprises a backflow prevention ball body arranged in the curved channel, the ball diameter of the backflow prevention ball body is smaller than the diameter of the curved channel, the upper end of the backflow prevention ball body is hinged to the inner wall of the curved channel, and a rubber sealing gasket which exceeds the ball surface and is used for blocking the curved channel is fixedly arranged on the backflow prevention ball body.

2. A plug backflow prevention mechanism as claimed in claim 1, wherein the two passage openings of the curved passage are one higher and one lower, the passage opening at the higher of the curved passage being adapted to the passage opening of the fluid inlet passage facing the spool; the fluid inlet pipeline and the fluid outlet pipeline are both in a round hole shape, and the aperture of the fluid inlet pipeline is the same as that of the fluid outlet pipeline;

the wall of the fluid inlet pipeline is fixedly provided with a stop block for stopping the backflow-preventing ball from rotating towards the inlet direction of the fluid inlet pipeline.

3. A cock backflow prevention mechanism as claimed in claim 2, wherein the backflow prevention ball is fixedly connected with a spring at a side thereof remote from the stopper, and the other end of the spring is fixedly connected to an inner wall of the curved passage.

4. The anti-backflow mechanism of the cock of claim 3, wherein the upper and lower sides of the valve core are provided with sealing rings fixedly connected to the valve stem; or the upper side and the lower side of the valve core are provided with filling materials positioned in the valve shell.

5. A cock backflow prevention mechanism as claimed in claim 4, wherein the backflow prevention ball is provided at its lower end with a groove in which a rubber packing is fixedly disposed.

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