CN110274045A - A kind of ball valve with non-return structure - Google Patents

Abstract

The invention relates to a ball valve with a non-return structure, which includes a valve body, an end cover, a ball core and a switch handle. The center of the valve body and the end cover is provided with a hollow inner channel, and the ball core is movable in the hollow In the inner channel, the ball core is provided with a horizontal core hole, the switch handle is connected to the ball core, and the ball core is driven to rotate by turning the switch handle to realize the opening or closing of the ball valve. The core of the ball core A non-return structure is provided in the hole, and the non-return structure includes a ball-segment sealing part and a non-return blocking part affixed thereto. The core hole includes an inlet end and an outlet end, and the inlet end is provided with a The arc-shaped tapered hole matched with the sealing part, and the outlet end is provided with a blocking ring that restricts the movement of the non-return blocking part. Compared with the existing technology, the ball valve has a compact structure and fewer parts, does not change the manufacturing process of the existing ball valve, is convenient for maintenance and processing, saves the installation of a special check valve in the pipeline, and reduces the risk of leakage.

Description

A ball valve with non-return structure

technical field

The invention relates to a ball valve, in particular to a ball valve with a non-return structure.

Background technique

Ball valves are widely used due to their small size and corrosion resistance. Its basic function is to cut off and connect the medium through the rotation of the ball core. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be rotated 90 degrees and a small rotational torque can be closed tightly. A general ball valve consists of a valve body, a ball and a valve stem, and is basically used as an on-off valve.

The check valve refers to a valve whose opening and closing parts are circular valve discs and which act by their own weight or medium pressure to block the backflow of the medium. In the existing pipeline technology, after installing the ball valve, in order to avoid the phenomenon of reverse flow in the pipeline, it is often necessary to install an additional check valve, which increases the complexity of the pipeline structure and the number of interfaces, thereby bringing the risk of leakage. If the ball valve and the check valve are integrated in sequence, the manufacturing difficulty of the ball valve will be increased.

Although the prior art has the invention that the ball valve and the check valve are integrated, they are basically equipped with a check structure at the front end or rear end of the ball valve. For example, CN202946731U provides a ball valve with a one-way non-return function, including a valve body, a ball valve core, a non-return valve core and a spring. The ball core is a spherical stainless steel member with a circular through hole horizontally penetrating in the center; a check valve core is located in the inner passage on the right side of the ball valve core, and a spring is provided on the right side of the check valve core, and the spring forces the check valve The core seals the right inner channel of the valve body. This patent has the following defects: 1) Because the structure is different from that of the ball valve, the manufacturing process of the existing ball valve cannot be used, and a new manufacturing process is required, which is difficult to manufacture; The path cannot be formed normally in the valve state; 3) A blocking spring is installed in the flow path, and the elasticity will decrease after a period of time, and the device will lose the non-return effect.

Contents of the invention

The purpose of the present invention is to provide a ball valve with a non-return structure in order to solve the above problems, which eliminates the installation of an additional non-return valve in the pipeline, reduces the risk of leakage of the pipeline, and does not change the manufacturing process of the existing ball valve. Only the manufacturing process of the ball valve spool is changed.

The object of the present invention is achieved through the following technical solutions:

A ball valve with a non-return structure, including a valve body, an end cover, a ball core and a switch handle, the end cover is installed at one end of the valve body, and a hollow inner passage is provided in the center of the valve body and the end cover. The ball core is movable in the hollow inner channel, the ball core is provided with a core hole that runs through horizontally, the switch handle is connected with the ball core, and the ball core is driven to rotate by turning the switch handle to realize the opening of the ball valve Or closed, the core hole of the ball core is provided with a non-return structure, the non-return structure includes a spherical segment sealing part and a non-return blocking part affixed to it, the core hole includes an inlet end and an outlet end, so The inlet end is provided with an arc-shaped tapered hole matched with the spherical segment sealing part, and the outlet end is provided with a blocking ring which restricts the movement of the non-return blocking part.

When the fluid flows through the core of the ball valve normally, the non-return structure is pushed to move to the position of the blocking ring at the outlet end of the core hole, and is limited, and the fluid flows out from the gap between the non-return structure and the core hole; The anti-reverse structure faces the arc-shaped tapered hole at the inlet end of the core hole, and the spherical segment sealing part of the non-reverse structure fits and seals with the arc-shaped tapered hole to prevent the reverse flow of fluid.

Further, the diameter of the arc-shaped tapered hole gradually increases along the direction of fluid flow in the ball valve.

Further, the core hole is a cylindrical hole at the rear of the arc-shaped tapered hole, the blocking ring is arranged at the end of the cylindrical hole, and the anti-return structure is restricted in the cylindrical hole.

Further, the non-return blocking part is a cross rib, the spherical segment sealing part is a spherical segment, and the front end has an arc-shaped sealing surface that fits sealingly with the arc-shaped tapered hole, and the spherical segment seal The rear end of the head is a circular plane.

Further, the size of the spherical segment sealing portion is smaller than the inner diameter of the cylindrical hole, and a gap for fluid to pass is formed between the non-return structure and the inner wall of the cylindrical hole.

Further, the length of the cross rib is smaller than the inner diameter of the cylindrical hole, but greater than the inner diameter of the blocking ring.

Further, the ball core is made of stainless steel.

Further, the spherical segment sealing part of the non-return structure is made of rubber or plastic material.

The working principle of the ball valve of the present invention is that when the fluid flows through the ball core in sequence, the non-return structure is pushed to move to the position of the blocking ring at the outlet end of the core hole. The gap between the structure and the core hole flows out; when a backflow occurs, the backflow fluid pushes the anti-return structure towards the arc-shaped tapered hole at the inlet end of the core hole, and the ball-shaped sealing part of the anti-return structure is provided with an arc-shaped sealing surface, and the arc-shaped sealing surface It can be well fitted and sealed with the arc-shaped tapered hole to prevent the backflow of fluid.

Compared with the prior art, the present invention has the following advantages:

1. The structure is compact and there are few parts, and the manufacturing process of the existing ball valve is not changed, which is convenient for maintenance and processing.

2. The installation of a special check valve in the pipeline is omitted, which reduces the risk of leakage.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 The right side view of the anti-reverse component.

In the figure, 1-switch handle, 2-valve body, 3-end cover, 4-spherical core, 5-spherical section sealing part, 6-non-return blocking part, 7-blocking ring.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, a ball valve with a non-return structure includes a valve body 2, an end cover 3, a ball core 4 and a switch handle 1, the end cover 3 is installed on one end of the valve body 2, and the center of the valve body 2 and the end cover 3 There is a hollow inner passage, and the ball core 4 is movable in the hollow inner passage, and the ball core 4 is provided with a horizontal core hole, the switch handle 1 is connected with the ball core 4, and the ball core 4 is driven to rotate by turning the switch handle 1 to realize the ball valve. on or off. The left side of the ball valve is the inlet end, and the right side is the outlet end. The switch handle 1 rotates from the horizontal position to the vertical position. At this time, the ball core rotates 90 degrees, the ball valve opens, and the fluid medium enters from the left side and passes through the core of the ball core 4. Hole outflow.

The core hole of the ball core 4 is provided with a non-return structure. The non-return structure includes a ball gap sealing part 5 and a non-return blocking part 6 affixed thereto. The core hole includes an inlet end and an outlet end. The arc-shaped tapered hole matched with the sealing part 5, the diameter of the arc-shaped tapered hole gradually increases along the direction of fluid flow in the ball valve, and the outlet end is provided with a blocking ring 7 that restricts the movement of the non-reverse blocking part 6 . The core hole is a cylindrical hole at the back of the arc tapered hole, the blocking ring 7 is arranged at the end of the cylindrical hole, and the non-return structure is limited in the cylindrical hole.

As shown in Figure 2, the non-return blocking part 6 is a cross rib, the spherical segment sealing part 5 is a spherical segment, and the front end has an arc-shaped sealing surface that fits the arc-shaped tapered hole. The rear end of the spherical segment sealing part 5 for a circular plane. The size of the spherical segment sealing part 5 is smaller than the inner diameter of the cylindrical hole, and a gap for fluid to pass is formed between the non-return structure and the inner wall of the cylindrical hole. The length of the cross rib is smaller than the inner diameter of the cylindrical hole and larger than the inner diameter of the blocking ring 7, so that the non-return structure can move freely in the core hole, and realize the limit on the right side and the sealing on the left side. The ball core can be made of stainless steel, and the ball-segment sealing part 5 of the non-return structure can be made of rubber or plastic.

The working principle of the ball valve of the present invention is that when the fluid normally flows through the ball valve core 4 from left to right in sequence, the non-return structure is pushed to move to the position of the blocking ring 7 at the outlet end of the core hole. Due to the function of the blocking ring 7, the non-return structure is blocked Position limit, the fluid flows out from the gap between the non-return structure and the core hole; when a backflow occurs, the backflow fluid pushes the non-return structure toward the arc-shaped tapered hole at the inlet end of the core hole, and the spherical segment sealing part 5 of the non-return structure is provided with an arc The arc-shaped sealing surface and the arc-shaped tapered hole can be well sealed to prevent the backflow of the fluid until the backflow situation disappears and the flow path is automatically reopened.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (8)

1. a kind of ball valve with non-return structure, including valve body, end cap, core and switch knob, the end cap is installed on described Valve body one end, the valve body and end cap central are equipped with hollow inner passageway, and the core is movably arranged in the hollow inner passageway, institute It states core and is equipped with horizontal perforative core bore, the switch knob is connect with the core, and drives ball by rotating switch handle Core rotation, realizes opening or closing for ball valve,

It is characterized in that, be movably equipped with non-return structure in the core bore of the core, the non-return structure include segment sealing with And the non-return blocking portion affixed with it, the core bore include arrival end and outlet end, the arrival end is equipped with close with the segment The tapered hole of the arc that envelope portion matches, the outlet end, which is equipped with, limits the mobile blocker ring of the non-return blocking portion.

2. a kind of ball valve with non-return structure according to claim 1, which is characterized in that the tapered hole edge of the arc The orient diameter that fluid flows in ball valve becomes larger.

3. a kind of ball valve with non-return structure according to claim 2, which is characterized in that the core bore is in the arc The rear portion in tapered hole is cylindrical hole, and the blocker ring is set to the end of cylindrical hole, and the non-return structure is limited in the cylinder In hole.

4. a kind of ball valve with non-return structure according to claim 3, which is characterized in that the non-return blocking portion is ten Word floor, the segment sealing are spherical scarce block, and front end has the arc sealing surface with the tapered hole palette of the arc, The rear end of the segment sealing is circular flat.

5. a kind of ball valve with non-return structure according to claim 4, which is characterized in that the ruler of the segment sealing The very little internal diameter less than the cylindrical hole forms the gap passed through for fluid between the non-return structure and cylindrical hole inner wall.

6. a kind of ball valve with non-return structure according to claim 5, which is characterized in that the length of the cross floor Less than the internal diameter of the cylindrical hole, greater than the internal diameter of blocker ring.

7. a kind of ball valve with non-return structure according to claim 1, which is characterized in that the core is stainless steel Matter is made.

8. a kind of ball valve with non-return structure according to claim 1, which is characterized in that the segment of the non-return structure Sealing is made using rubber or plastic material.