Stop valve stable in sealing

Abstract

According to the technical scheme, the stop valve is characterized by comprising 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, one end of the outer rod is fixedly connected with the valve clack, and the inner rod penetrates through the outer rod and can move in the length direction of the outer rod. The end, penetrating into the rod groove, of the inner rod is provided with a circular truncated cone portion coaxial with the inner rod, the end face, with the large diameter, of the circular truncated cone portion is connected with the end of the inner rod, and the diameter of the circumference where the ends, extending into the rod groove, of the push rods are located is between the minimum diameter and the maximum diameter of the circular truncated cone portion. 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 stop valves, and more particularly to a stop valve with stable sealing. Background Art

[0002] The stop valve is the most widely used valve. It has the advantages of small friction between the sealing surfaces during opening and closing, relatively durable, small opening height, easy manufacturing and convenient maintenance. Therefore, this type of valve is very suitable for cutting or adjusting. The existing stop valve can basically meet people's use needs, but there are still problems. In order to keep the valve disc and the valve seat in close contact, the existing stop valve only uses the valve stem to press the valve disc down. As the pressure of the medium under the valve disc increases, the thrust on the valve stem and the components connected to the valve stem increases, which will cause the valve stem to bend and deform and be damaged, and the connection structure of the components connected to the valve stem is easily damaged, resulting in a decrease in connection stability, causing the valve disc and the valve seat to loosen and leak. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model aims to provide a stop valve with a valve stem and a valve stem external assembly having a stable structure and a stable seal between the valve disc and the valve seat.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stop valve with stable sealing, comprising a valve body, a valve seat positioned in the valve body, a valve disc capable of forming a hard seal with the valve seat, and a valve stem for driving the valve disc to move up and down, the valve disc being provided with a rod groove for inserting one end of the valve stem, a concave buckle groove being provided on the outer wall of the valve seat, at least two buckle feet capable of partially extending into the buckle groove being elastically hinged on the peripheral wall of the valve disc, a push rod capable of moving radially along the valve disc and corresponding to the buckle feet one by one being provided in the valve disc, one end of at least two of the push rods extending into the rod The valve stem comprises an outer rod with one end fixedly connected to the valve disc and an inner rod penetrating the outer rod and movable along the length direction of the outer rod. A truncated cone portion coaxial with the inner rod is arranged on the end portion of the inner rod penetrating the rod groove, and the end surface with a larger diameter of the truncated cone portion is connected with the end portion of the inner rod. The circumferential diameter of the ends of the multiple push rods extending into the rod groove is between the minimum diameter and the maximum diameter of the truncated cone portion. The inner rod moves linearly into the rod groove relative to the outer rod so that one end of the multiple push rods slides relative to the peripheral wall of the truncated cone portion and drives the corresponding buckle foot to rotate.

[0005] As a further improvement of the present invention, the height of the plurality of push rods relative to the bottom of the rod groove is greater than the height of the truncated cone portion.

[0006] As a further improvement of the present invention, both ends of the plurality of push rods are hemispherical.

[0007] As a further improvement of the present invention, the plurality of buckle feet are all provided with ribs capable of contacting with the peripheral wall of the valve disc.

[0008] As a further improvement of the utility model, the inner cavity of the outer rod is countersunk, and the inner rod is coaxially connected to a limit ring limitedly located in the large end of the inner cavity of the outer rod.

[0009] The beneficial effects of the utility model are: BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model when it is in a closed state and the buckle foot is in an open state;

[0011] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0012] Figure 3 for Figure 2 The state diagram when the middle buckle foot is buckled with the buckle groove;

[0013] Figure 4 for Figure 1 The enlarged view of point B in the middle;

[0014] Figure 5 It is a three-dimensional diagram of the valve stem, valve disc and valve seat of the utility model when they are assembled together.

[0015] Figure numerals: 1, valve body; 2, valve seat; 21, buckle groove; 3, valve disc; 31, rod groove; 32, buckle foot; 33, push rod; 34, rib; 4, valve stem; 41, outer rod; 42, inner rod; 43, frustum; 44, limit ring. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0017] Reference Figures 1 to 5 As shown, a sealing stable stop valve of this embodiment comprises 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.

[0018] Based on the above-mentioned prior art, the valve seat 2 is cylindrical and an annular buckle groove 21 coaxial with the valve seat 2 is processed on the outer wall. For the convenience of explanation, the number of buckle feet 32 ​​is positioned at two, and the corresponding number of push rods 33 is also two. The valve flap 3 includes a seat body and an end cover that can be assembled together. The rod groove 31 is divided into two parts and is respectively located on the seat body and the end cover. Two symmetrically arranged rotation grooves and located on the edge of the seat body are provided on the end surface where the seat body and the end cover are attached, and a sliding groove extending radially along the seat body and connected to the rod groove 31. The two ends of the sliding groove are respectively connected to the two rotation grooves. , an axial groove is provided on the edges of the two groove walls facing each other of the two rotating grooves, and the two buckle feet 32 ​​each include a middle part that can be coaxial with the axial groove, a baffle that can block the end of the sliding groove, and a buckle plate that can buckle in the buckle groove 21 at one end, one end of the buckle plate and the baffle are respectively connected to the two sides of the middle part, and the angle between the buckle plate and the baffle is an obtuse angle, and the two ends of the middle part are integrally formed with rotating shafts that can be placed in the two axial grooves respectively, and torsion springs are provided on the two rotating shafts, and one end of the torsion spring is fixedly connected to one side of the buckle foot 32, and the buckle foot 32 equipped with the torsion spring is placed in the rotating groove and the two The two rotating shafts are respectively located in the corresponding shaft grooves, and then the other end of the torsion spring is positioned on the inner wall of the rotating groove. Then, the two push rods 33 are placed in the sliding grooves and one end of the two push rods 33 is respectively in contact with the two baffles. The ends of the two push rods 33 facing each other are extended into the rod grooves 31. Finally, the end covers are covered on the seat body and fixedly connected with bolts. The two buckle feet 32 ​​are both limited on the valve disc 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 hollow and can be penetrated by the inner rod 42. A truncated cone portion 43 is integrally formed on one end of the inner rod 42. The truncated cone portion The end with a larger diameter of 43 is coaxially connected with the inner rod 42, and the circumferential diameter of the ends of the two push rods 33 extending into the rod groove 31 is between the minimum diameter and the maximum diameter of the truncated cone 43. The rod groove 31 can be a countersunk groove. One end of the outer rod 41 is inserted into the large end of the rod groove 31 and the end face of the outer rod 41 touches the stepped surface of the rod groove 31. The outer rod 41 is connected to the valve disc 3 in a common way in the prior art, and then the inner rod 42 is passed through the outer rod 41 until the peripheral wall of the truncated cone 43 is supported by one end of the two push rods 33, and the inner rod 42 can move linearly along the length direction of the outer rod 41.

[0019] In the initial state, the valve disc 3 is separated from the valve seat 2, and the medium inside the valve body 1 is in a flowing state. The two buckle feet 32 ​​are turned outward relative to the peripheral wall of the valve disc 3 and are in an open state. The truncated cone 43 is supported by the two push rods 33 and is suspended relative to the bottom of the rod groove 31; in the process of closing the valve, the outer rod 41 drives the inner rod 42 and the valve disc 3 to move downward as a whole until the valve disc 3 and the valve seat 2 are tightly fitted to form a hard seal, and then the inner rod 42 is moved linearly into the rod groove 31 relative to the outer rod 41, and the two push rods 33 slide relative to the peripheral wall of the truncated cone 43 and move along the diameter direction of the valve disc 3, and the two push rods 33 push the two buckle feet 32 ​​respectively so that the two buckle feet 32 ​​rotate relative to the valve disc 3, and the torsion spring is deformed until the inner rod 42 When the end of the push rod 33 touches the bottom of the rod groove 31 or the two buckle feet 32 ​​are in place with the buckle groove 21, the inner rod 42 stops moving relative to the outer rod 41. In order to avoid the possibility that the push rod 33 forces the inner rod 42 to move relative to the outer rod 41 under the action of the torsion spring, a locking bolt with one end that can touch the outer wall of the inner rod 42 can be threadedly connected to the outer wall of the outer rod 41; in the process of opening the valve, first loosen the locking bolt, then move the inner rod 42 relative to the outer rod 41 to the outside of the rod groove 31 in a straight line, the torsion spring restores its elastic deformation, and the two buckle feet 32 ​​are separated from the buckle groove 21 and turned outward until the push rod 33 returns to its initial state, then the inner rod 42 stops moving relative to the outer rod 41, and then the outer rod 41 is used to drive the valve disc 3 away from the valve seat 2;

[0020] Compared with the prior art, such a design can further stabilize the sealing between the valve disc 3 and the valve seat 2 by fastening the buckle foot 32 with the buckle groove 21. At the same time, the buckling force generated by the buckle foot 32 and the buckle groove 21 can help the valve stem 4 share the thrust generated by the medium on the valve disc 3, thereby reducing the thrust on the valve stem 4 and the external components of the valve stem 4, and effectively ensuring the structural stability of the valve stem 4 and the external components of the valve stem 4.

[0021] To further explain, the circumference of the circumferential cross-section of the conical portion 43 and the end face size of the push rod 33 will affect the number of push rods 33. In most cases, the push rod 33 is unique or small in number, and the number of push rods 33 is proportional to the circumference of the circumferential cross-section of the conical portion 43. The number of push rods 33 can be three, four or more and distributed in a geometric manner. In order to ensure smooth sliding of the push rod 33 and the conical portion 43 and small driving force required for the inner rod 42, the number of push rods 33 is generally three or four.

[0022] As a specific implementation method of the improvement, multiple references Figure 2 and Figure 3As shown, the height of each push rod 33 relative to the bottom of the rod groove 31 is greater than the height of the truncated cone 43. When the truncated cone 43 touches the bottom of the rod groove 31, one end of each push rod 33 touches the outer wall of the inner rod 42. Compared with the previous embodiment in which a locking bolt is used to prevent the inner rod 42 from moving relative to the outer rod 41, this design can simplify the processing technology and operating steps while ensuring that the inner rod 42 cannot be pushed by the push rod 33, thereby indirectly improving the efficiency of opening and closing the valve flap 3.

[0023] As a specific implementation method of the improvement, refer to Figure 2 and Figure 3 As shown, both ends of the multiple push rods 33 are hemispherical. Such a design can reduce the wear between the push rod 33 and the gradient wall 431 and between the push rod 33 and the buckle foot 32, while also reducing the friction force, thereby ensuring the smooth sliding between the gradient wall 431 and the push rod 33 and between the push rod 33 and the buckle foot 32.

[0024] As a specific implementation of the improvement, when the valve flap 3 is opened relative to the valve seat 2, the medium flow rate is fast and the impact force is large, which is easy to generate thrust on the buckle foot 32 and force the buckle foot 32 to deform, which will affect the degree of buckling between the buckle foot 32 and the buckle groove 21. In order to solve the above-mentioned problem, refer to Figure 5 As shown, the plurality of buckle feet 32 ​​are all provided with ribs 34 that can contact the peripheral wall of the valve flap 3. Such a design can improve the bending resistance of the buckle feet 32, thereby ensuring the structural stability of the buckle feet 32.

[0025] As a specific implementation of the improvement, the inner cavity of the outer rod 41 is countersunk, and the inner rod 42 is coaxially connected to a limit ring 44 limitedly located in the large end of the inner cavity of the outer rod 41. A rod cover that can contact the limit ring 44 is added at the end of the outer rod 41 to limit the limit ring 44 in the inner cavity with a larger inner diameter of the outer rod 41. Subsequently, the limit ring 44 contacts the stepped surface of the inner cavity of the outer rod 41 and the rod cover respectively, so that the distance that the inner rod 42 moves up and down relative to the outer rod 41 is limited. The design of the limit ring 44 contacting the rod cover can avoid the phenomenon that the inner rod 42 can directly fall out of the outer rod 41. Compared with the design of the limit ring 44 contacting the stepped surface of the inner cavity of the outer rod 41 and the end of the inner rod 42 contacting the bottom of the rod groove 31, the design can avoid the phenomenon that the valve flap 3 is locally deformed due to the pressure of the inner rod 42, thereby improving the structural stability of the valve flap 3 and indirectly ensuring the sealing stability between the valve flap 3 and the valve seat 2.

[0026] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A stop valve with stable sealing, 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) comprises 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 move along the length of the outer rod (41). An inner rod (42) is arranged on the end of the inner rod (42) that penetrates into the rod groove (31) and is coaxial with the inner rod (42). The end surface of the truncated cone (43) with a larger diameter is connected with the end of the inner rod (42). The circumferential diameter of the ends of the plurality of push rods (33) that extend into the rod groove (31) is between the minimum diameter and the maximum diameter of the truncated cone (43). The inner rod (42) moves linearly into the rod groove (31) relative to the outer rod (41), so that one end of the plurality of push rods (33) slides relative to the peripheral wall of the truncated cone (43) and drives the corresponding buckle feet (32) to rotate.

2. A shut-off valve with stable sealing according to claim 1, characterized in that: The height of the plurality of push rods (33) relative to the bottom of the rod groove (31) is greater than the height of the truncated cone portion (43).

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

4. A shut-off valve with stable sealing 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).

5. A shut-off valve with stable sealing according to claim 1 or 2, characterized in that: The inner cavity of the outer rod (41) is in the shape of a countersunk head, and the inner rod (42) is coaxially connected to a limit ring (44) which is limitedly located in the large end of the inner cavity of the outer rod (41).

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