CN111503304A - Ball valve and its assembly method - Google Patents

Abstract

The invention relates to the field of valve bodies and provides a ball valve and an assembling method thereof. The ball valve comprises a valve ball, a valve body and an upper end cover plate, wherein a valve shaft is constructed on the valve ball, the ball valve also comprises a sealing cover plate and a clamping ring, and the sealing cover plate and the upper end cover plate are fixedly connected and are both arranged at the port of the valve body; the sealing cover plate is abutted against the root of the valve shaft of the valve ball; the inner wall of the valve body is provided with a groove, the clamping ring is clamped in the groove, and the part of the clamping ring exposed out of the groove is clamped between the upper end cover plate and the sealing cover plate. According to the ball valve provided by the invention, the upper end cover plate and the sealing cover plate are fixedly connected, the axial movement of the upper end cover plate and the sealing cover plate along the valve shaft can be limited through the clamping ring, and compared with the traditional ball valve structure, the liquid pressure in the ball valve is finally borne by the clamping ring, so that the situation that the leakage is caused by the fact that the liquid pressure in the ball valve impacts the upper end cover plate and the sealing is not tight is effectively avoided.

Description

Ball valve and its assembly method

technical field

The invention relates to the technical field of valve bodies, in particular to a ball valve and an assembling method thereof.

Background technique

Ball valves are widely used in petroleum, chemical, energy, mining and other fields. They are important components in industrial pipelines and are mainly used to control the on-off of pipelines. Usually in the ball valve assembly process, the valve ball needs to be loaded into the valve body from the upper end of the ball valve, resulting in a large diameter of the opening at the upper end of the ball valve. Therefore, very high requirements are put forward for the installation and fixation of the upper end cover of the sealed ball valve, especially for high pressure ball valve. If the upper cover plate is unreliably fixed, the ball valve may explode easily, causing serious safety accidents.

Usually, the upper cover plate of the ball valve is generally fixed on the valve body of the ball valve by bolts. In this fixing method, the pressure of the internal medium of the valve on the upper cover plate is finally borne by the fastening bolts, and the pressure fluctuates for a long time. On the one hand, the bolts are prone to loosening under the driving of the alternating tension, which leads to the leakage of the upper cover plate due to insufficient sealing;

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a ball valve and an assembling method thereof, which are used to solve the problems that the bolting of the upper cover plate and the valve body in the existing ball valve easily leads to leakage and low safety.

In order to solve the above technical problems, the present invention provides a ball valve, including a valve ball, a valve body and an upper end cover plate, the valve ball is constructed with a valve shaft, and also includes a sealing cover plate and a snap ring, the sealing cover plate and the The upper end cover plate is fixedly connected and installed at the port of the valve body; the sealing cover plate is in contact with the root of the valve shaft; the inner wall of the valve body is provided with a groove, and the snap ring is clamped In the groove, the portion of the snap ring exposed to the groove is sandwiched between the upper end cover and the sealing cover.

Further, the valve body and the outer wall of the upper end cover plate are circumferentially fixed by a limit groove and a limit block that cooperate with each other.

Further, the limit grooves include a plurality of limit grooves, and the plurality of limit grooves are all located on the valve body and are evenly distributed along the circumferential direction of the valve body.

Further, the snap ring includes at least three ring bodies, and the ring bodies are connected end to end in sequence.

Further, two end faces of at least one segment of the ring body are parallel to a certain diameter of the snap ring.

Further, a side of the upper end cover plate close to the sealing cover plate is provided with a first stepped surface, and a portion of the snap ring exposed to the groove is in contact with the first stepped surface.

Further, the port of the valve body is provided with an annular groove, and a flange is provided along the circumferential direction of the upper end cover plate, and the flange is accommodated in the annular groove.

Further, a blocking block is protruded from the side of the sealing cover plate away from the valve ball, and a side of the upper cover plate facing the valve ball is provided with a blocking groove, and the blocking block is mounted on the blocking groove. .

Further, the valve shaft is a stepped shaft, a middle portion of the sealing cover plate is provided with a stepped hole, and the stepped shaft is inserted into the stepped hole.

In order to solve the above technical problems, the present invention also provides a method for assembling a ball valve, comprising the steps of:

Step S10, the valve ball with the valve shaft installed is loaded into the valve body, and the sealing cover plate is clamped and fixed at the port of the valve body;

Step S20, each ring body of the snap ring is respectively installed into the groove on the valve body, and one side of the snap ring is in contact with the side of the sealing cover plate away from the valve ball;

Step S30, the upper end cover is installed on the port of the valve body, the side of the upper end cover facing the valve ball is pressed on the snap ring, and the upper end cover is connected to the valve body. The limit block and the limit slot are snap-fitted;

In step S40, the upper end cover plate and the sealing cover plate are fixedly connected with fasteners.

In the ball valve provided by the present invention, the upper cover plate and the sealing cover plate are fixedly connected, and the movement of the upper end cover plate and the sealing cover plate along the axial direction of the valve shaft can be restricted by the snap ring. Compared with the traditional ball valve structure, the liquid pressure in the ball valve is ultimately It is borne by the snap ring, so as to effectively avoid the situation that the liquid pressure in the ball valve impacts the upper end cover plate and causes the leakage due to poor sealing.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a ball valve according to an embodiment of the present invention;

Figure 2 is a partial cross-sectional view of the valve body shown in Figure 1;

FIG. 3 is a schematic diagram of the cooperation between the valve body and the upper cover plate shown in FIG. 1;

FIG. 4 is a top view of the upper end cover shown in FIG. 1;

Fig. 5 is the structural representation of the snap ring shown in Fig. 1;

Figure 6 is a cross-sectional view of the upper end cover shown in Figure 1;

FIG. 7 is a cross-sectional view of the sealing cover shown in FIG. 1 .

In the figure: 1, valve ball; 11, valve shaft; 2, valve body; 21, groove; 22, limit groove; 3, upper cover plate; 31, limit block; 32, first step surface; 33, Flange; 34, snap groove; 4, sealing cover; 41, through hole; 42, snap block; 5, snap ring; 51, first ring body; 52, second ring body; 53, third ring body; 54. Fourth ring body; 6. Bolt.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are used to clearly describe the numbering of product components and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are based on the directions shown in the drawings. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 , a ball valve includes a valve ball 1 , a valve body 2 , an upper cover plate 3 , a sealing cover plate 4 and a snap ring 5 . Among them, the valve ball 1 is installed in the cavity in the valve body 2, the upper end cover plate 3 and the sealing cover plate 4 are fixedly connected by bolts and are both installed at the port of the valve body 2; the snap ring 5 is installed on the upper end cover plate 3 and Seal between cover plates 4. Specifically, a valve shaft 11 is constructed on the valve ball 1 . The valve shaft 11 is inserted into the sealing cover plate 4 and the upper end cover plate 3 , and the valve shaft and the upper end cover plate 3 and the sealing cover plate 4 are slidably fitted. The sealing cover plate 4 is in contact with the root of the valve shaft 11 , that is, the sealing cover plate 4 is closer to the sphere of the valve ball 1 than the upper end cover plate 3 . As shown in FIG. 2 , the inner wall of the valve body 2 is provided with a groove 21 , the snap ring 5 is clamped in the groove 21 , and the part of the snap ring 5 exposed to the groove 21 is sandwiched between the upper end cover 3 and the sealing cover 4 between.

In the ball valve provided by the embodiment of the present invention, the upper end cover plate 3 and the sealing cover plate 4 are fixedly connected, and the upper end cover plate 3 and the sealing cover plate 4 can be restricted from moving along the axial direction of the valve shaft by the snap ring 5. Compared with the traditional ball valve structure , the liquid pressure in the ball valve is finally borne by the snap ring 5, so as to effectively avoid the situation where the liquid pressure in the ball valve impacts the upper end cover plate 3 and causes leakage due to poor sealing.

Further, the valve body 2 and the upper cover plate 3 are fixed in the circumferential direction through the limiting groove 22 and the limiting block 31 . In one embodiment, as shown in FIG. 3 , a limiting groove 22 is provided at the port of the valve body 2 , and as shown in FIGS. 3 and 4 , a limiting block 31 is protruded from the outer wall of the upper cover plate 3 . The limit block 31 has the same number as the limit slot 22, and can be one or more. When there is one, the limit block 31 is directly installed in the limit slot 22 to prevent the upper end cover 3 and the sealing cover from being fixedly connected together. The plate 4 moves along the circumferential direction of the valve shaft; when there are more than one, the two are arranged in one-to-one correspondence. Preferably, the limiting grooves 22 include multiple, and the multiple limiting grooves 22 are evenly distributed along the circumference of the valve body 2 . Correspondingly, the limiting blocks 31 are evenly distributed along the circumference of the outer wall of the upper cover plate 3 . In this embodiment, the upper end cover plate 3 and the sealing cover plate 4 are restricted from rotating in the circumferential direction of the valve shaft by the cooperation of the limit block 31 and the limit groove 22 , thereby realizing the reliable fixation of the upper end cover plate 3 . Therefore, in the ball valve provided by the embodiment of the present invention, the upper cover plate 3 and the sealing cover plate 4 cannot rotate in the circumferential direction under the action of the limit block 31 and the limit groove 22 , and the valve shaft can be restricted under the action of the snap ring 5 It moves in the axial direction, thereby improving the reliability of the ball valve assembly and avoiding the internal fluid pressure causing the upper cover plate 3 to be loosely sealed. In another embodiment, the valve body 2 is provided with a limiting block, and the upper cover plate 3 is provided with a limiting groove. At this time, the port of the valve body 2 is a stepped hole, the large diameter section of the stepped hole is far away from the valve ball 1, and a limit block is protruded on the inner wall of the valve body 2 corresponding to the large diameter section, wherein the outermost end of the limit block is It does not extend into the small diameter section of the valve body 2, so as not to affect the installation of the valve ball 1; correspondingly, a limit groove is set in the area where the upper end cover plate 3 and the stepped hole are matched, so as to realize the circumference of the upper end cover plate 3 and the sealing cover plate 4. to lock. Likewise, the number and distribution of the limit grooves and the limit blocks can be set to be uniformly distributed or one or more randomly distributed as required. Of course, the valve body 2 may also be provided with a limit block and a limit groove at the same time, and a limit groove and a limit block may be correspondingly provided on the upper cover plate 3 , which will not be described in detail in this embodiment of the present invention.

Since the outer diameter of the snap ring 5 is larger than the inner diameter of the port of the valve body 2, in order to facilitate the smooth installation of the snap ring 5, the snap ring 5 provided in the embodiment of the present invention includes at least three segments of rings, and the at least three segments of rings are arranged in sequence from end to end. connected to form a ring. For example, the snap ring 5 may be divided into three sections, four sections or five sections, for which there is no specific requirement in the embodiment of the present invention. During assembly, the snap ring 5 can be installed in the groove 21 by installing the ring bodies one by one.

Wherein, the two end faces of at least one of the ring bodies are parallel to a certain diameter of the snap ring 5 . When assembling, one of the ring bodies with end faces at both ends parallel to a certain diameter of the snap ring 5 is finally snapped in, so as to realize the smooth snapping. Specifically, as shown in FIG. 5 , the snap ring 5 is formed by splicing four sections of a first ring body 51 , a second ring body 52 , a third ring body 53 and a fourth ring body 54 in sequence. Wherein, both end surfaces of the first ring body 51 extend along the radial direction of the snap ring 5 to form radial end surfaces; both end surfaces of the third ring body 53 extend in a direction parallel to the diameter of the snap ring 5, that is, to form a radial end surface. Parallel end faces; the second ring body 52 and the fourth ring body 54 have the same structure, one end face is a radial end face, which is respectively connected with the two end faces of the first ring body 51, and the other end face is a parallel end face, used for connecting with the third card Both ends of the ring 53 are abutted. Besides, there may be other separation methods, which are not listed one by one in the embodiments of the present invention.

Specifically, as shown in FIG. 6 , a first stepped surface 32 is provided on the side of the upper end cover 3 close to the sealing cover 4 , and the portion of the snap ring 5 exposed to the groove 21 abuts against the first stepped surface 32 . The snap ring 5 is sandwiched between the first stepped surface 32 and the sealing cover 4 . Of course, a stepped surface can also be provided on the side of the sealing cover plate 4 facing away from the valve ball 1 . One side of the snap ring 5 is in contact with the stepped surface, and the other side of the snap ring 5 is in contact with the end surface of the flat upper end cover 3 . This embodiment of the present invention is not specifically limited, as long as the snap ring is disposed in the accommodating cavity formed by the groove 21 , the upper end cover 3 and the sealing cover 4 .

In the embodiment of the present invention, the port of the valve body 2 is provided with an annular groove, the large diameter end of the annular groove is located outside the valve body 2, and the groove 21 is located in the small diameter area of the annular groove. As shown in FIG. 6 , the upper cover plate 3 is provided with a flange 33 , and the flange 33 is accommodated in an annular groove at the port of the valve body 2 . Of course, the port of the valve body 2 can also be provided with a through hole with the same diameter, the upper cover plate 3 is installed in the through hole, the limit block 31 on the upper end cover plate 3 and the limit groove 22 on the valve body 2 cooperate with each other to limit the two While the valve shaft 11 moves in the circumferential direction, the axial position of the upper end cover plate 3 can also be positioned.

Wherein, as shown in FIG. 7 , a through hole 41 is provided in the middle of the sealing cover plate 4 , the valve shaft 11 is a stepped shaft, and the stepped shaft is inserted into the through hole 41 . The valve shaft 11 is in sliding sealing fit with the inner wall of the through hole 41 , and a sealing ring is installed between the valve shaft 11 and the hole wall of the through hole 41 . Specifically, the sealing cover plate 4 and the upper end cover plate 3 are fixedly connected by bolts.

Specifically, in the embodiment of the present invention, a blocking block 42 is protruded from the side of the sealing cover plate 4 away from the valve ball 1 , and a blocking groove 34 is provided on the side of the upper cover plate 3 facing the valve ball 1 , and the blocking block 42 is mounted on the clamping block 42 . The upper end cover plate 3 and the sealing cover plate 4 are fixed together by bolts.

In addition, the present invention also provides a method for assembling a ball valve, which specifically includes the following steps:

In step S10 , the valve ball 1 with the valve shaft 11 installed is loaded into the valve body 2 , and the sealing cover plate 4 is clamped and fixed at the port of the valve body 2 . The outer wall of the sealing cover plate 4 is attached and fixed to the inner wall of the valve body 2 , and a sealing ring is installed between the outer wall of the sealing cover plate 4 and the inner wall of the valve body 2 . The through hole 41 on the sealing cover plate 4 is slidably sealed with the valve shaft 11 .

Step S20 , each ring body of the snap ring 5 is installed into the groove 21 on the valve body 2 respectively, so that one side of the snap ring 5 abuts the side of the sealing cover 4 away from the valve ball 1 . Wherein, as shown in FIG. 5 , the first ring body 51 , the second ring body 52 and the fourth ring body 54 are respectively installed into the groove 21 , and finally the third ring body 53 is installed into the groove 21 , thereby form a complete ring structure.

Step S30, install the upper cover 3 on the port of the valve body 2, and press the side of the upper cover 3 toward the valve ball 2 on the snap ring 5, so that the limit block 31 on the upper cover 3 is clamped on the valve. in the limiting groove 22 of the body 2 . Thereby, the snap ring 5 is snapped into the groove 21 and sandwiched by the upper end cover 3 and the sealing cover 4 .

In step S40, the upper end cover plate 3 and the sealing cover plate 4 are fixedly connected by using fasteners such as bolts 6.

In the ball valve provided by the embodiment of the present invention, compared with the traditional method of directly fixing the upper cover plate to the valve body port by bolts, the snap ring 5 clamped in the groove 21 bears the impact force of the liquid in the valve, and the strength is higher. The pressure resistance at the port of the valve body 2 is improved; and the upper cover plate 3 locks the snap ring 5 that bears the impact force of the liquid in the groove 21 by mechanical means, and will not be separated or loosened during long-term use. High and long service life.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A ball valve, comprising a valve ball, a valve body and an upper end cover, wherein the valve ball is constructed with a valve shaft, and also includes a sealing cover plate and a snap ring, the sealing cover plate and the upper end cover The plates are fixedly connected and installed at the port of the valve body; the sealing cover plate is in contact with the root of the valve shaft; the inner wall of the valve body is provided with a groove, and the snap ring is clamped on the valve body. In the groove, the part of the snap ring exposed to the groove is sandwiched between the upper end cover plate and the sealing cover plate. 2 . The ball valve according to claim 1 , wherein the valve body and the outer wall of the upper end cover plate are circumferentially fixed by a limit groove and a limit block that cooperate with each other. 3 . 3 . The ball valve according to claim 2 , wherein the limit grooves comprise several, and the plurality of limit grooves are all located on the valve body and are evenly distributed along the circumference of the valve body. 4 . 4 . The ball valve according to claim 1 , wherein the snap ring comprises at least three ring bodies, and the ring bodies are connected end to end in sequence. 5 . 5 . The ball valve according to claim 4 , wherein two end faces of at least one segment of the ring body are parallel to a certain diameter of the snap ring. 6 . 6 . The ball valve according to claim 1 , wherein a side of the upper cover plate close to the sealing cover plate is provided with a first stepped surface, and the part of the snap ring exposed to the groove is connected to the The first step surface is in contact with each other. 7 . The ball valve according to claim 6 , wherein the port of the valve body is provided with an annular groove, and a flange is provided along the circumferential direction of the upper end cover plate, and the flange is accommodated in the annular groove. 8 . 8 . The ball valve according to claim 1 , wherein a locking block is protruded from the side of the sealing cover plate away from the valve ball, and a locking groove is formed on the side of the upper end cover plate facing the valve ball. 9 . , the card block is installed in the card slot. 9 . The ball valve according to claim 1 , wherein the valve shaft is a stepped shaft, and a middle portion of the sealing cover plate is provided with a through hole for the stepped shaft to pass through. 10 . 10. A method for assembling a ball valve, comprising the steps of: Step S10, the valve ball with the valve shaft installed is loaded into the valve body, and the sealing cover plate is clamped and fixed at the port of the valve body; Step S20, each ring body of the snap ring is respectively installed into the groove on the valve body, and one side of the snap ring is in contact with the side of the sealing cover plate away from the valve ball; Step S30, the upper end cover is installed on the port of the valve body, the side of the upper end cover facing the valve ball is pressed on the snap ring, and the upper end cover is connected to the valve body. The limit block and the limit slot are snap-fitted; In step S40, the upper end cover plate and the sealing cover plate are fixedly connected with fasteners.

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