阅读说明：本技术 一种可流量微调的球阀 (Ball valve capable of fine-adjusting flow ) 是由 冷远鹏 范宾 刘赟 张小沁 于 2019-10-30 设计创作，主要内容包括：本发明涉及一种可流量微调的球阀,包括构成阀腔的阀体和端盖、设于阀腔内的球芯和与带动球芯旋转的调节手柄,所述球芯上设有贯穿的阀通道,所述阀体和端盖上设有与所述阀腔连通的流体通道,所述阀通道包括主通道和狭缝通道,在球芯由全关位置旋转到全开位置的过程中,所述主通道、狭缝通道先后与所述流体通道连通。与现有技术相比,本发明具有流量调节快速、精准、调节方便等优点。(The invention relates to a ball valve capable of finely adjusting flow, which comprises a valve body and an end cover which form a valve cavity, a ball core arranged in the valve cavity and an adjusting handle for driving the ball core to rotate, wherein a valve passage which penetrates through the ball core is arranged on the ball core, fluid passages which are communicated with the valve cavity are arranged on the valve body and the end cover, the valve passage comprises a main passage and a slit passage, and the main passage and the slit passage are sequentially communicated with the fluid passages in the process that the ball core rotates from a fully closed position to a fully open position. Compared with the prior art, the invention has the advantages of rapid and accurate flow regulation, convenient regulation and the like.)

1. A ball valve capable of finely adjusting flow comprises a valve body (2) and an end cover (3) which form a valve cavity, a ball core (4) arranged in the valve cavity and an adjusting handle (1) which drives the ball core (4) to rotate, wherein a valve passage (5) which penetrates through the ball core (4) is arranged on the valve body (2) and the end cover (3), and a fluid passage which is communicated with the valve cavity is arranged on the valve body (2) and the end cover (3),

the valve passage (5) comprises a main passage (51) and a slit passage (52), and the main passage (51) and the slit passage (52) are communicated with the fluid passage in sequence in the process that the ball core (4) rotates from the fully closed position to the fully open position.

2. A flow rate trim ball valve according to claim 1, characterized in that the main passage (51) and the slit passage (52) are in communication with the fluid passage one after the other during rotation of the core (4) from the fully closed position to the fully open position.

3. A flow rate trimmable ball valve according to claim 1, characterized in that said slit passage (52) and the main passage (51) are connected in communication.

4. A flow-rate-trimmable ball valve as claimed in claim 1, characterized in that said main channel (51) has a semicircular-like shape in cross section; the cross section of the slit passage (52) is in a strip shape.

5. A flow-rate-trimmable ball valve as claimed in claim 4, characterized in that, in the cross-section of said valve channel (5), the extension of said strip is perpendicular to the vertical sides of said semi-circular like shape.

6. A flow rate fine-adjustable ball valve according to claim 4, wherein the width of the rectangle in the length direction of the circular arc-shaped vertical side is 0.05 to 0.1 times the length of the semicircular-like vertical side.

7. A flow rate trim ball valve in accordance with claim 4 wherein said semi-circular like shape is semi-circular and said elongated shape is rectangular.

8. A flow rate trim ball valve according to claim 1, characterized in that the main channel (51) is in full communication with the fluid channel when the core (4) is rotated 30-60 ° from the fully closed position to the fully open position.

9. A finely adjustable flow ball valve according to claim 8, wherein the main passage (51) is in full communication with the fluid passage when the core (4) is rotated 45 ° from the fully closed position to the fully open position.

10. A flow-rate-trimmable ball valve according to claim 1, characterized in that said adjustment handle (1) extends through the side wall of said valve body (2) and is rotatably connected to said valve body (2), the end of said adjustment handle being fixedly connected to said core (4).

Technical Field

The invention relates to a ball valve, in particular to a ball valve capable of finely adjusting flow.

Background

Ball valves are widely used due to their advantages of small size, corrosion resistance, etc. The basic function of the device is to realize the cut-off and the connection of the medium through the rotation of the ball core. The ball valve is mainly used for cutting off, distributing and changing the flow direction of a medium in a pipeline, and can be closed tightly only by rotating 90 degrees and a small rotating moment. The general ball valve includes valve body, ball body and valve stem. In some engineering fields, the flow valve is required to be stable at a fixed flow rate for a long time, and an offset value can be given to the flow rate through rapid and accurate fine adjustment under some special test working conditions.

Chinese patent CN105387238A discloses a ball valve that can close fast and can finely tune flow, can push down the screw rod through grab handle 14, accomplishes and cuts up the interior fluid of valve body fast, can come to carry out fine adjustment to the speed of passing through of the interior fluid of valve body through the difference to the screw rod degree of pushing down. However, the ball valve in the patent technology cannot simultaneously realize long-term maintenance of large flow, and can realize quick and accurate flow fine adjustment on the basis of the flow. This is because 1. the fluid passage in the core is a large through hole, and a small change in the opening causes a large change in the flow rate, and it is impossible to achieve precise adjustment for some small flow passages requiring fine adjustment. 2. If the fluid passage is completely formed in a slit type, although the minute flow rate can be accurately adjusted, the large flow rate cannot be passed due to the narrow slit.

In addition, although chinese patent CN105387238A discloses a ball valve capable of being closed quickly and adjusting the flow rate, the means for adjusting the flow rate is to press down the screw rod by hand to different degrees. But in reality, it is easy to understand that the force of hand depression cannot be quantified, and it is impossible to achieve accurate control of flow rate by hand depression; 2. generally, the passage of the ball core of the ball valve is circular in cross section, the screw is used for blocking the flow path and is also necessarily circular in cross section, and the ball valve cannot provide a space for the ball valve to slide up and down; 3. even if the screw can slide up and down, fluid leakage is likely to occur at the screw because the flow path is in contact with the screw. Therefore, the invention can not realize long-term maintenance of larger flow and can realize quick and accurate flow fine adjustment on the basis of the flow.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the ball valve which has high adjustment precision and convenient flow adjustment and can finely adjust the flow.

The purpose of the invention can be realized by the following technical scheme:

a ball valve capable of fine adjustment of flow comprises a valve body and an end cover which form a valve cavity, a ball core arranged in the valve cavity and an adjusting handle driving the ball core to rotate, wherein a valve passage penetrating through the ball core is arranged on the ball core, fluid passages communicated with the valve cavity are arranged on the valve body and the end cover, the valve passage comprises a main passage and a slit passage, and the main passage and the slit passage are communicated with each other when the ball core rotates from a fully closed position to a fully open position.

According to the invention, the valve channel on the ball core is divided into the main channel and the slit channel, in the rotation process of the valve core, along with the change of the rotation angle of the valve core, the communication area of the slit channel and the fluid channel is increased linearly, the slit width of the slit is designed appropriately, and along with the increase of the opening of the valve, the flow area of the valve channel is increased slowly, so that the increase of the flow is also slow, and the fine adjustment of the fluid flow is realized.

The main passage and the slit passage are in communication with the fluid passage one after the other as the core rotates from the fully closed position to the fully open position.

In the ball valve, along with the increase of the opening degree of the valve, the main channel is firstly communicated with the fluid channel, so that the flow is quickly increased to a set large flow value and is kept for a long time; when the flow needs to be increased by fine adjustment on the basis of large flow, the slit channel is communicated with the fluid channel by further increasing the opening of the valve, so that the flow of the fluid is fine adjusted.

Further, the slit passage is in communication connection with the main passage.

Further, the cross section of the main channel is in a semi-circular-like shape; the cross section of the slit passage is in a strip shape.

The quasi-semi-circle shape is a shape generated after linear cutting is adopted for a circular shape, and can be a standard semi-circle or a structure with the area smaller than that of the semi-circle or a structure with the area larger than that of the semi-circle.

Further, on the cross section of the valve passage, the extending direction of the strip shape is perpendicular to the vertical side of the semi-circular-like shape.

Further, in the length direction of the semi-circular-like vertical side, the width of the rectangle is 0.05-0.1 times of the length of the semi-circular-like vertical side.

Further, the semi-circular shape is semi-circular, and the strip shape is rectangular.

Further, when the ball core rotates 30-60 degrees from the fully closed position to the fully open position, the main channel is just communicated with the fluid channel completely.

Further, when the ball core rotates 45 degrees from the fully closed position to the fully open position, the main channel is just communicated with the fluid channel completely.

When the opening degree is set to be 45 degrees, the main channel is completely communicated with the fluid channel, so that the large flow can be kept for a long time, and the operation of an operator can be facilitated.

Preferably, the adjusting handle penetrates through the side wall of the valve body and is connected with the valve body in a rotating mode, and the end portion of the adjusting handle is fixedly connected with the ball core.

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

(1) the flow can be conveniently and accurately controlled by controlling the opening degree by utilizing the principle that the area of the slit can show linear and slow change along with the increase of the opening degree of the valve;

(2) the main channel and the slit channel are communicated with the fluid channel in sequence, long-term maintenance under large flow is realized by the communication of the main channel and the fluid channel, linear fine adjustment of the flow can be realized on the basis of large flow according to requirements, and the adjustment precision is high;

(3) the main channel is matched with the slit channel, the main channel is quickly adjusted to a large flow set value, and then a large amount of process debugging time can be saved through an adjusting mode of fine adjustment of the slit channel.

Drawings

FIG. 1 is a schematic view of the vertical cross section of the present invention;

FIG. 2 is a schematic cross-sectional view of a valve passage according to the present invention;

FIG. 3 is a graph showing the relationship between the valve opening and the flow rate according to the present invention;

in the figure, 1 is an adjusting handle, 2 is a valve body, 3 is an end cover, 4 is a ball core, 5 is a valve passage, 51 is a main passage, and 52 is a slit passage.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.