Stop valve capable of being closed stably

Abstract

According to the technical scheme, the stop valve comprises a valve body, a valve seat, a valve clack and a valve rod, a rod groove is formed in the valve clack, a concave buckling groove is formed in the outer wall of the valve seat, and at least two buckling feet capable of partially stretching into the buckling groove are elastically hinged to the circumferential wall of the valve clack. Push rods which can move in the radial direction of the valve clack and correspond to the buckling feet in a one-to-one mode are arranged in the valve clack, one ends of the at least two push rods stretch into the rod groove, the other ends of the at least two push rods abut against the corresponding buckling feet, and the valve rod comprises an outer rod and an inner rod, arc-shaped grooves which are in one-to-one correspondence with the push rods and into which the end parts of the corresponding push rods extend are formed in the end surfaces, penetrating into the rod grooves, of the inner rods, and each arc-shaped groove comprises a gradual change wall which can abut against the end parts of the push rods and of which the outline gradually changes relative to the axis of the corresponding inner rod, and two limiting walls which are respectively positioned at the two ends of the gradual change wall; the problems that in the prior art, a valve rod is prone to damage, and the sealing performance between a valve clack and a valve seat is unstable are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of globe valves, and more specifically to a globe valve with stable closing performance. Background Art

[0002] The globe valve is one of the most widely used valves. It has the advantages of small friction between sealing surfaces during opening and closing, being relatively durable, having a small opening height, being easy to manufacture and maintain. Therefore, this type of valve is very suitable for functions such as cutting off or regulating. Existing globe valves can basically meet people's usage requirements, but there are still problems. Existing globe valves only use the method of the valve stem pressing down the valve flap to keep the valve flap and the valve seat in close fit. As the pressure of the medium below the valve flap increases, the thrust on the valve stem and the components externally connected to the valve stem increases. This will cause the valve stem to bend and deform and be damaged, and the connection structure of the components externally connected to the valve stem is likely to be damaged, leading to a decrease in connection stability, resulting in loosening between the valve flap and the valve seat and leakage. Content of the Utility Model

[0003] Aiming at the deficiencies existing in the prior art, the purpose of the present utility model is to provide a globe valve with stable structures of the valve stem and the components externally connected to the valve stem, and stable fit between the valve flap and the valve seat.

[0004] To achieve the above purpose, the present utility model provides the following technical solution: A globe valve with stable closing performance, including a valve body, a valve seat positioned within the valve body, a valve flap capable of forming a hard seal with the valve seat, and a valve stem for driving the valve flap to move up and down. The valve flap is provided with a rod groove for inserting one end of the valve stem. A concave-shaped buckle groove is provided on the outer wall of the valve seat. At least two buckle feet capable of partially extending into the buckle groove are elastically hinged on the peripheral wall of the valve flap. A push rod capable of moving radially along the valve flap and corresponding to each buckle foot one by one is arranged within the valve flap. One end of each of the at least two push rods extends into the rod groove and the other end abuts against the corresponding buckle foot. The valve stem includes an outer rod fixedly connected to the valve flap at one end and an inner rod passing through the outer rod and capable of rotating relative to the outer rod. An arc-shaped groove corresponding to each push rod one by one and for the end of the corresponding push rod to extend into is formed on the end face of the inner rod penetrating into the rod groove. Each of the multiple arc-shaped grooves includes a gradually changing wall capable of abutting against the end of the push rod and having a contour gradually changing relative to the axis of the inner rod, and two limiting walls respectively located at both ends of the gradually changing wall. By rotating the inner rod relative to the outer rod, the push rod moves radially along the valve flap and drives the buckle foot to rotate relative to the valve flap.

[0005] As a further improvement of the present utility model, each of the multiple arc-shaped grooves further includes a constant wall connecting the end of the gradually changing wall farthest from the axis of the inner rod to the corresponding limiting wall. Each of the multiple constant walls is coaxial with the inner rod and has a circular arc contour with a constant radius.

[0006] As a further improvement of the present utility model, both ends of each of the multiple push rods are hemispherical.

[0007] As a further improvement of the present utility model, a rib plate capable of abutting against the peripheral wall of the valve flap is provided on each of the plurality of fastening feet.

[0008] The beneficial effects of the present utility model are as follows: By rotating the inner rod relative to the outer rod, the plurality of push rods all slide relative to the corresponding gradually changing wall and move along the diameter direction of the valve flap. The plurality of push rods respectively push the corresponding fastening feet, so that the plurality of fastening feet all rotate relative to the valve flap until the plurality of fastening feet are all fastened in place with the fastening grooves. Such a design can, compared with the prior art, further stabilize the sealing performance between the valve flap and the valve seat by using the fastening of the fastening feet and the fastening grooves. At the same time, the fastening force generated by the fastening of the fastening feet and the fastening grooves can help the valve stem share the thrust generated by the medium on the valve flap, thereby reducing the thrust received by the valve stem and the external components connected to the valve stem, and effectively ensuring the structural stability of the valve stem and the external components connected to the valve stem. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the present utility model in a closed state and with the fastening feet in an open state;

[0010] Figure 2 is Figure 1 an enlarged view of part A in

[0011] Figure 3 is Figure 2 a state diagram when the fastening feet and the fastening grooves are fastened in

[0012] Figure 4 It is a three-dimensional view of the valve stem, valve flap and valve seat of the present utility model assembled together;

[0013] Figure 5 is Figure 4 an exploded view of

[0014] Figure 6 It is a three-dimensional view of the fastening feet, push rods and valve stem of the present utility model assembled together;

[0015] Figure 7 is Figure 6 a top view of

[0016] Reference numerals: 1, valve body; 2, valve seat; 21, fastening groove; 3, valve flap; 31, rod groove; 32, fastening foot; 33, push rod; 34, rib plate; 4, valve stem; 41, outer rod; 42, inner rod; 43, arc groove; 431, gradually changing wall; 432, limiting wall; 433, constant wall. Detailed Description of the Invention

[0017] The present utility model will be further described in detail below with reference to the drawings and embodiments. Among them, the same components are denoted by the same reference numerals.

[0018] Refer toFigures 1 to 7 As shown in Figures 1 to 7 , a shut-off valve with stable closing in this embodiment includes a valve body 1, a valve seat 2 positioned within the valve body 1, a valve flap 3 capable of forming a hard seal with the valve seat 2, and a valve stem 4 driving the valve flap 3 to move up and down. The valve flap 3 is provided with a rod groove 31 for one end of the valve stem 4 to insert into;

[0019] Based on the foregoing prior art, the valve seat 2 is in a cylindrical shape and an annular snap groove 21 coaxial with the valve seat 2 is machined on the outer wall. For the convenience of description, the number of snap feet 32 is set to two, and correspondingly, the number of push rods 33 is also two. The valve flap 3 includes a seat body and an end cover that can be fitted together. The rod groove 31 is located at one end of the seat body. On the end face of the seat body without the rod groove 31, two rotation grooves symmetrically arranged and located on the edge of the seat body and a sliding groove extending along the radial direction of the seat body and communicating with the rod groove 31 are provided. Both ends of the sliding groove are respectively communicated with the two rotation grooves. On the edge of the two opposite groove walls of the two rotation grooves, shaft grooves are provided. Both snap feet 32 include a middle part coaxial with the shaft groove, a baffle capable of blocking the port of the sliding groove, and a snap plate with an end that can be buckled in the snap groove 21. One ends of the snap plate and the baffle are respectively connected to both sides of the middle part, and the included angle between the snap plate and the baffle is an obtuse angle. At both ends of the middle part, rotating shafts that can be respectively placed in the two shaft grooves are integrally formed. Torsion springs are arranged on both rotating shafts. One end of the torsion spring is fixedly connected to one side of the snap foot 32. The snap foot 32 with the torsion spring is placed in the rotation groove and the two rotating shafts are respectively located in the corresponding shaft grooves. Then the other end of the torsion spring is positioned on the inner wall of the rotation groove. Then both push rods 33 are placed in the sliding groove and one ends of the two push rods 33 are respectively abutted against the two baffles. The opposite ends of the two push rods 33 extend into the rod groove 31. Finally, the end cover is covered on the seat body and fixedly connected by bolts. Both snap feet 32 are limited on the valve flap 3 and can rotate elastically. The valve stem 4 includes an outer rod 41 and an inner rod 42. The middle part of the outer rod 41 is hollowed out and can be penetrated by the inner rod 42. One end of the inner rod 42 is integrally formed with a push plate with a diameter larger than the inner diameter of the outer rod 41. At the edge of the end face of the push plate away from the outer rod 41, two arc-shaped grooves 43 symmetrically arranged at the center are machined. Both arc-shaped grooves 43 can accommodate one end of the corresponding push rod 33. Both arc-shaped grooves 43 include a gradual change wall 431 capable of abutting against the end of the push rod 33 and two limit walls 432 respectively located at both ends of the gradual change wall 431. The distance of the gradual change wall 431 relative to the axis of the push plate gradually changes with the rotation direction of the gradual change wall 431. The inner rod 42 is penetrated through the outer rod 41 until the push plate abuts against one end of the outer rod 41. Subsequently, the push plate and one end of the outer rod 41 are successively placed in the rod groove 31. The outer rod 41 is connected to the valve flap 3 in a commonly used manner in the prior art. The push plate is limited in the rod groove 31 and can rotate relative to the rod groove 31 along with the inner rod 42;

[0020] In the initial state, the valve flap 3 is separated from the valve seat 2, and the medium inside the valve body 1 is in a flowing state. Both retaining feet 32 are turned outwards relative to the peripheral wall of the valve flap 3 and are in an open state. The end of the gradual change wall 431 closest to the axis of the push plate touches the end of the push rod 33. During the process of closing the valve, the outer rod 41 drives the inner rod 42 and the valve flap 3 to move downward as a whole until the valve flap 3 is in close contact with the valve seat 2 to form a hard seal. Subsequently, the inner rod 42 is rotated clockwise relative to the outer rod 41. Both push rods 33 slide relative to the corresponding gradual change walls 431 and move along the diameter direction of the valve flap 3. The two push rods 33 respectively push the two retaining feet 32, causing both retaining feet 32 to rotate relative to the valve flap 3, and the torsion spring deforms until one end of both push rods 33 touches the limiting wall 432 on the other end of the corresponding arc-shaped groove 43 or both retaining feet 32 are engaged with the engaging grooves 21 in place, then the inner rod 42 no longer rotates relative to the outer rod 41. To avoid the possibility that the push rod 33 forces the inner rod 42 to rotate relative to the outer rod 41 under the action of the torsion spring, a locking bolt whose one end can touch the outer wall of the inner rod 42 can be threadedly connected to the outer wall of the outer rod 41. During the process of opening the valve, first loosen the locking bolt, then rotate the inner rod 42 counterclockwise relative to the outer rod 41. The torsion spring resumes its elastic deformation, and both retaining feet 32 are separated from the engaging grooves 21 and turned outwards until the push rods 33 return to the initial state, then the inner rod 42 no longer rotates relative to the outer rod 41. Subsequently, use the outer rod 41 to drive the valve flap 3 away from the valve seat 2;

[0021] Such a design can further stabilize the sealing performance between the valve flap 3 and the valve seat 2 by using the engagement of the retaining feet 32 and the engaging grooves 21 compared with the prior art. At the same time, the engaging force generated by the engagement of the retaining feet 32 and the engaging grooves 21 can help the valve stem 4 share the thrust generated by the medium on the valve flap 3, thereby reducing the thrust received by the valve stem 4 and the external components connected to the valve stem 4, effectively ensuring the structural stability of the valve stem 4 and the external components connected to the valve stem 4;

[0022] Further explanation, since the perimeter of the push plate and the arc length of the arc-shaped groove 43 will affect the number of arc-shaped grooves 43. In most cases, the specification of the valve stem 4 is small, so the perimeter of the push plate is small. To ensure the smooth sliding of the push rod 33 and the arc-shaped groove 43, generally the number of arc-shaped grooves 43 is two or three.

[0023] As a specific embodiment of the improvement, referring to Figure 7 As shown, each of the multiple arc-shaped grooves 43 further includes a constant wall 433 connecting the end of the gradual change wall 431 farthest from the axis of the inner rod 42 to the corresponding limiting wall 432. The multiple constant walls 433 are coaxial with the inner rod 42 and the contour is an arc with a constant radius. The design that the push rod 33 touches the constant wall 433 and cannot force the inner rod 42 to rotate relative to the outer rod 41 can simplify the processing technology and operation steps compared with the design of using a locking bolt to prevent the inner rod 42 from rotating relative to the outer rod 41 in the previous embodiment, and indirectly improve the efficiency of opening and closing the valve flap 3.

[0024] As a specific implementation of the improvement, refer to Figures 5 to 7 As shown, both ends of multiple push rods 33 are hemispherical. Such a design can slow down the wear between the push rod 33 and the tapered wall 431 and between the push rod 33 and the buckle 32. At the same time, it can also reduce the frictional force and ensure the smooth sliding between the tapered wall 431 and the push rod 33 and between the push rod 33 and the buckle 32.

[0025] As a specific implementation of the improvement, when the valve flap 3 opens relative to the valve seat 2, the medium flow rate is fast and the impact force is large, which is likely to generate a thrust on the buckle 32 and force the buckle 32 to deform. This will affect the buckling degree between the buckle 32 and the buckle groove 21. To solve the above problems, refer to Figure 5 and Figure 6 As shown, multiple buckles 32 are each provided with a rib plate 34 that can abut against the peripheral wall of the valve flap 3. Such a design can improve the bending resistance of the buckle 32, thereby ensuring the structural stability of the buckle 32.

[0026] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. Any technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A shut-off valve with stable closing, comprising a valve body (1), a valve seat (2) positioned in the valve body (1), a valve flap (3) capable of forming a hard seal with the valve seat (2), and a valve stem (4) driving the valve flap (3) to move up and down, wherein the valve flap (3) is provided with a stem groove (31) for inserting one end of the valve stem (4), and characterized in that: The outer wall of the valve seat (2) is provided with a concave buckle groove (21); the peripheral wall of the valve flap (3) is elastically hinged with at least two buckle feet (32) that can partially extend into the buckle groove (21); the valve flap (3) is provided with a push rod (33) that can move along the radial direction of the valve flap (3) and corresponds to the buckle feet (32) one by one; one end of at least two of the push rods (33) extends into the rod groove (31) and the other end contacts the corresponding buckle feet (32); the valve stem (4) includes an outer rod (41) one end of which is fixedly connected to the valve flap (3) and a push rod (41) that penetrates the outer rod (41) and can rotate relative to the outer rod (41). An inner rod (42) is provided, and an arcuate groove (43) corresponding to the push rod (33) and for the end of the corresponding push rod (33) to extend into is formed on the end surface of the inner rod (42) inserted into the rod groove (31). The arcuate grooves (43) each include a gradual wall (431) which can contact the end of the push rod (33) and whose contour gradually changes relative to the axis of the inner rod (42), and two limiting walls (432) respectively located at both ends of the gradual wall (431). By rotating the inner rod (42) relative to the outer rod (41), the push rod (33) moves radially along the valve flap (3) and drives the buckle foot (32) to rotate relative to the valve flap (3).

2. A shut-off stable stop valve according to claim 1, characterized in that: The plurality of arc-shaped grooves (43) also include a constant wall (433) connecting the end of the gradual wall (431) farthest from the axis of the inner rod (42) with the corresponding limiting wall (432); the plurality of constant walls (433) are coaxial with the inner rod (42) and have a contour of an arc with a constant radius.

3. A shut-off stable stop valve according to claim 1 or 2, characterized in that: Both ends of the plurality of push rods (33) are hemispherical.

4. A shut-off stable stop valve according to claim 1 or 2, characterized in that: The plurality of buckle feet (32) are each provided with a rib plate (34) capable of contacting the peripheral wall of the valve flap (3).

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