Hard-to-hard zero-leakage butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a hard-to-hard zero-leakage butterfly valve which comprises a butterfly valve body, an upper shaft sleeve and a lower shaft sleeve are integrally formed at the upper end and the lower end of the butterfly valve body respectively, and a valve rod is movably installed between the butterfly valve body and the upper shaft sleeve and between the butterfly valve body and the lower shaft sleeve. When the bolt is screwed into the mounting groove, the end of the bolt opens the lantern ring, the inserting rods at the two ends of the lantern ring slide in the inserting grooves till the other end of the bolt is fixed to the bolt groove, and then the lantern ring is connected to the annular groove in a sleeved mode to form a self-locking structure, so that the bolt can be prevented from retreating after being mounted, positioning is not needed during fixing, and automatic locking can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a hard-to-hard zero-leakage butterfly valve. Background Technique

[0002] A butterfly valve, also called a flap valve, is a simple-structured regulating valve. A butterfly valve that can be used for the on-off control of a low-pressure pipeline medium refers to a valve in which the closing member (valve flap or butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing.

[0003] As disclosed in a hard-to-hard zero-leakage butterfly valve with the authorization announcement number CN207064658U, it includes a butterfly valve body, an inner hexagon bolt, a pressing plate ring, a sealing ring, and a chamber for accommodating the head of the inner hexagon bolt. The characteristics are: a positioning groove extending along the axial direction of the inner hexagon bolt and penetrating through the top of the inner hexagon bolt is opened on the outer side wall of the head of the inner hexagon bolt, and a clamping groove parallel to the positioning groove and penetrating through the port of the chamber is opened on the inner side wall of the chamber. After adopting the above technical solution, the beneficial effect of the utility model is: a positioning insert block is assembled outside the inner hexagon bolt. The addition of this positioning insert block improves the sealing performance of the inner hexagon bolt. Even if the valve is affected by fluid movement and valve vibration during long-term use, it can reduce the loosening or even falling off of the inner hexagon bolt between the pressing plate ring and the butterfly plate, and thus the phenomenon of external leakage of the medium liquid will not occur, which greatly improves the service life of the product, reduces the on-site maintenance rate of the product, and improves the safety performance.

[0004] Although the above patent can reduce the loosening or even falling off of the inner hexagon bolt between the pressing plate ring and the butterfly plate, when installing the bolt, the positioning groove on the bolt may not correspond to the position of the clamping groove every time. When the two are misaligned, the plug cannot be inserted. Therefore, during positioning, the difficulty is relatively large and there is uncertainty. Content of the Utility Model

[0005] The purpose of the utility model is to provide a hard-to-hard zero-leakage butterfly valve to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hard-to-hard zero-leakage butterfly valve, comprising

[0008] a butterfly valve body, upper and lower shaft sleeves are integrally formed at the upper and lower ends of the butterfly valve body respectively, and a valve stem is movably installed between the butterfly valve body and the upper and lower shaft sleeves;

[0009] a butterfly plate is fixedly arranged on the outer side of the middle part of the valve stem, a pressing plate is arranged on the other side of the butterfly plate, an inner seal is annularly arranged between the outer sides of the pressing plate and the butterfly plate, and a fixing mechanism is arranged between the inner parts of the pressing plate and the butterfly plate.

[0010] Preferably, the fixing mechanism comprises a mounting groove, the mounting groove is provided on both sides of the pressure plate, a bolt groove is provided on one side of the butterfly plate close to the mounting groove, and a bolt is provided between the mounting groove and the bolt groove;

[0011] Preferably, the fixing mechanism further comprises a collar, the collar is movably mounted on the inner side of the mounting groove, one side of the collar is provided with an opening, and an annular groove matching the collar is provided on the outer side of one end of the bolt close to the mounting groove;

[0012] Preferably, the fixing further comprises a slot, the slots are symmetrically arranged on both sides of the mounting groove close to the collar, and the insert rods are symmetrically arranged on both sides of the collar away from the opening, and the insert rods are movably sleeved with the slots;

[0013] Preferably, both ends of the butterfly valve body are provided with sealing grooves, and an external seal is movably installed inside the sealing groove;

[0014] Preferably, an elastic ring is provided between the sealing groove and the outer seal.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. This is a hard-on-hard zero-leakage butterfly valve. When the bolt is twisted into the installation groove, the end of the bolt opens the collar, and the rods at both ends of the collar slide in the slot until the other end of the bolt is fixed to the bolt groove. The collar is sleeved on the annular groove to form a self-locking structure, which can prevent the bolt from retreating after installation, and when fixed, it can be automatically locked without positioning.

[0017] 2. This is a hard-on-hard zero-leakage butterfly valve. The device is provided with sealing grooves in annular shapes at both ends of the butterfly valve body. Elastic rings are provided inside the two sealing grooves. External seals are abutted against the outer sides of the elastic rings. This can further improve the sealing performance when docking with the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall main structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the butterfly valve body of the utility model;

[0020] Figure 3 This is a schematic diagram of the elastic ring structure of the utility model;

[0021] Figure 4 For the utility model Figure 2 The enlarged schematic diagram at A in the middle;

[0022] Figure 5 It is a schematic diagram of the front view structure of the sleeve ring of the present utility model.

[0023] In the figure: 1. butterfly valve body; 2. upper sleeve; 3. lower sleeve; 4. valve stem; 5. butterfly plate; 6. pressure plate; 7. inner seal; 8. mounting groove; 9. bolt groove; 10. bolt; 11. collar; 12. opening; 13. annular groove; 14. slot; 15. plug rod; 16. sealing groove; 17. outer seal; 18. elastic ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figures 1-5 As shown, a technical solution provided by the utility model:

[0026] A hard-to-hard zero-leakage butterfly valve comprises a butterfly valve body 1, wherein an upper sleeve 2 and a lower sleeve 3 are integrally formed at the upper and lower ends of the butterfly valve body 1, respectively, and a valve stem 4 is movably installed between the butterfly valve body 1 and the upper sleeve 2 and the lower sleeve 3; a butterfly plate 5 is fixedly arranged on the outer side of the middle part of the valve stem 4, a pressure plate 6 is arranged on the other side of the butterfly plate 5, an inner seal 7 is arranged in an annular manner between the pressure plate 6 and the outer side of the butterfly plate 5, and a fixing mechanism is arranged between the pressure plate 6 and the inner part of the butterfly plate 5; the fixing mechanism comprises an installation groove 8, the installation groove 8 is arranged on both sides of the pressure plate 6, and the butterfly plate 5 is close to the installation groove A bolt groove 9 is provided on one side of the mounting groove 8, and a bolt 10 is provided between the mounting groove 8 and the bolt groove 9; the fixing mechanism also includes a collar 11, which is movably installed on the inner side of the mounting groove 8, and an opening 12 is provided on one side of the collar 11, and an annular groove 13 matching the collar 11 is provided on the outer side of one end of the bolt 10 close to the mounting groove 8; the fixing further includes a slot 14, and the slots 14 are symmetrically provided on both sides of the mounting groove 8 close to the collar 11, and the collar 11 is symmetrically provided on both sides away from the opening 12. The rods 15 are movably sleeved with the slots 14;

[0027] In this embodiment, when the bolt 10 is twisted into the interior of the installation groove 8, the end of the bolt 10 opens the ring 11, and the insertion rods 15 at both ends of the ring 11 slide in the slot 14 until the other end of the bolt 10 is fixed to the bolt groove 9. The ring 11 is sleeved on the annular groove 13 to form a self-locking structure, which can prevent the bolt 10 from retreating after installation, and when fixed, it can be automatically locked without positioning.

[0028] like Figure 1 and Figure 3As shown, both ends of the butterfly valve body 1 are provided with sealing grooves 16, and an external seal 17 is movably installed inside the sealing groove 16; an elastic ring 18 is provided between the sealing groove 16 and the external seal 17;

[0029] In this embodiment, the device is provided with sealing grooves 16 in annular shapes at both ends of the butterfly valve body 1. Elastic rings 18 are provided inside the two sealing grooves 16. External seals 17 abut against the outer sides of the elastic rings 18. This can further improve the sealing performance when docking with the flange.

[0030] Working principle: When installing the inner seal 7, the inner seal 7 is sleeved on the outer ring of the butterfly plate 5 near the pressure plate 6, and then the pressure plate 6 is abutted against the outside of the side with the inner seal 7, and the bolt 10 is inserted from the installation groove 8, twisted and threaded in the bolt groove 9, so that the butterfly plate 5 is fixedly connected to the pressure plate 6 and the inner seal 7 is clamped. When the bolt 10 is twisted into the inside of the installation groove 8, the end of the bolt 10 opens the ring 11, and the insertion rods 15 at both ends of the ring 11 slide in the slot 14 until the other end of the bolt 10 is fixed to the bolt groove 9, and the ring 11 is sleeved on the annular groove 13 to form a self-locking structure, which can prevent the bolt 10 from retreating after installation, and when fixed, it can be automatically locked without positioning.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A hard-on-hard zero-leakage butterfly valve, characterized in that: include A butterfly valve body (1), wherein an upper shaft sleeve (2) and a lower shaft sleeve (3) are integrally formed at the upper and lower ends of the butterfly valve body (1), respectively, and a valve stem (4) is movably mounted between the butterfly valve body (1) and the upper shaft sleeve (2) and the lower shaft sleeve (3); A butterfly plate (5) is fixedly arranged on the outer side of the middle part of the valve stem (4), a pressure plate (6) is arranged on the other side of the butterfly plate (5), an inner seal (7) is arranged in an annular shape between the pressure plate (6) and the outer side of the butterfly plate (5), and a fixing mechanism is arranged between the pressure plate (6) and the inside of the butterfly plate (5).

2. A hard-on-hard zero-leakage butterfly valve according to claim 1, characterized in that: The fixing mechanism comprises a mounting groove (8), the mounting groove (8) being arranged on both sides of the pressure plate (6), a bolt groove (9) being arranged on one side of the butterfly plate (5) close to the mounting groove (8), and a bolt (10) being arranged between the mounting groove (8) and the bolt groove (9).

3. A hard-on-hard zero-leakage butterfly valve according to claim 2, characterized in that: The fixing mechanism also includes a collar (11), the collar (11) being movably mounted on the inner side of the mounting groove (8), one side of the collar (11) being provided with an opening (12), and an annular groove (13) matching the collar (11) being provided on the outer side of one end of the bolt (10) close to the mounting groove (8).

4. A hard-on-hard zero-leakage butterfly valve according to claim 3, characterized in that: The fixing further comprises a slot (14), the slots (14) are symmetrically arranged on both sides of the mounting groove (8) close to the collar (11), and the insertion rods (15) are symmetrically arranged on both sides of the collar (11) away from the opening (12), and the insertion rods (15) are movably sleeved with the slots (14).

5. The hard-on-hard zero-leakage butterfly valve according to claim 1, characterized in that: Both ends of the butterfly valve body (1) are provided with sealing grooves (16), and an external seal (17) is movably installed inside the sealing groove (16).

6. The hard-on-hard zero-leakage butterfly valve according to claim 5, characterized in that: An elastic ring (18) is provided between the sealing groove (16) and the outer seal (17).

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