Plug body axial pressing structure

Abstract

The utility model discloses a plug body axial pressing structure which comprises a plug body upper rod, a plug cock pressing ring, a plug cock pressing cover, a steel ball and a pressing block. The plug body upper rod is connected to the plug body and extends out of the valve body; the valve cover is arranged on the outer side of the plug body upper rod in a sleeving mode and connected with the valve body. A packing assembly is arranged between the valve cover and the plug body upper rod; the outer side of the plug body upper rod is sleeved with a packing gland, and the end of the packing gland abuts against the packing assembly. The pressing block is arranged on the outer side of the plug body upper rod in a sleeving mode, and the end of the pressing block abuts against the packing gland. A sealing piece is arranged between the plug body and the valve cover; a mounting hole is formed in the plug body upper rod in the radial direction; the steel balls are connected into the mounting holes in a sliding mode, and the steel balls can stretch out of the mounting holes and abut against the corresponding matching faces on the pressing blocks. The packing assembly obtains continuous and uniform pressing force, the sealing reliability of the valve is improved, and the phenomenon of operation jamming is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plug valves, in particular to a plug body axial compression structure. BACKGROUND

[0002] The plug valve is a valve for switching flow passages by rotating a plug body, and the sealing performance thereof depends on the close fit between the plug body and the valve body.

[0003] In the traditional structure, the circumferential seal of the plug body is unevenly compressed due to the self-weight, especially the seal at the bottom of the plug body, which is subjected to a large pressure and is prone to wear and failure after long-term operation. The packing assembly is used to prevent leakage of the medium from the valve stem, but the traditional bolt fastening structure cannot guarantee uniform axial compression force, so that the packing assembly is subjected to uneven compression force, and the compression force is not concentrated, which is prone to warping and dispersion. In particular, in large plug valves, uneven bolt fastening can exacerbate the deflection of the plug body, causing the valve to jam during opening and closing, and affecting the sealing reliability.

[0004] Therefore, there is an urgent need for a plug body axial compression structure to improve the sealing performance of the plug valve and prolong the service life of the valve. CONTENT OF THE INVENTION

[0005] The plug body axial compression structure provided by the application solves the problem of uneven axial compression force of the packing assembly, dispersion of the compression force, warping, valve jamming during opening and closing, and low sealing reliability caused by the bolt fastening method in the prior art, so that the packing assembly is uniformly and continuously compressed, the sealing reliability of the valve is improved, the operation jamming is eliminated, and the service life of the valve is prolonged.

[0006] The utility model discloses an axial compression structure of plug body provides, including plug body upper stem, plug ring, plug gland, steel ball and briquetting, plug body upper stem is connected in plug body, and plug body upper stem projects valve body, the valve cover is equipped with in the outside of plug body upper stem, and valve cover with valve body is connected, the valve cover with the plug body upper stem between being provided with packing assembly, the outside of plug body upper stem is equipped with packing gland, and the end of packing gland with packing assembly abuts, the briquetting is equipped with in the outside of plug body upper stem, and the end of briquetting with packing gland is away from the abutment of one end of packing assembly, the sealing element is arranged between plug body and valve cover, the radial direction of plug body upper stem is equipped with mounting hole, steel ball is slidably connected in mounting hole, and steel ball can project mounting hole and with the cooperation of the face of briquetting upper abutment, plug ring and plug gland are equipped with in the outside of plug body upper stem in proper order, and plug ring sets up between plug gland and briquetting, and plug ring passes through the cooperation of spherical surface structure and the step surface of plug body upper stem, and the end of plug gland is close to valve cover with plug ring abutment, and plug gland is connected with valve cover through fastener.

[0007] In a possible implementation, the utility model further includes an elastic member; the elastic member is arranged in the mounting hole; one end of the elastic member is connected with the plug body upper stem, and the other end of the elastic member is connected with the steel ball.

[0008] In a possible implementation, the briquetting is provided with a first inclined surface, and the steel ball can project the mounting hole and abut against the first inclined surface.

[0009] In a possible implementation, the briquetting is further provided with a second inclined surface, and the steel ball can project the mounting hole and abut against the second inclined surface.

[0010] In a possible implementation, an installation groove is arranged at one end of the briquetting towards the valve cover; an opening of the installation groove faces the packing gland, and a terminal end of the installation groove extends to the first inclined surface; the first inclined surface is connected with the second inclined surface; when the briquetting is in a compression position, the steel ball abuts against the second inclined surface and is configured to exert a component force on the briquetting, which is directed towards the packing gland.

[0011] In a possible implementation, a concave structure is arranged at one end of the plug ring close to the valve cover; a convex structure is arranged on the step surface of the plug body upper stem; through the cooperation of the convex structure and the concave structure, the compression force of the plug ring on the plug body upper stem is concentrated and transmitted to the axis of the plug body upper stem along the normal direction of the concave structure or the convex structure.

[0012] In a possible implementation, the concave structure and the convex structure have the same spherical diameter.

[0013] In a possible implementation, an anti-friction pad is arranged between the plug compression ring and the plug compression cover.

[0014] In a possible implementation, the packing assembly comprises an upper scraping ring and a lower scraping ring; the upper scraping ring and the lower scraping ring are sequentially sleeved on the outer side of the plug upper rod; and the upper scraping ring and the lower scraping ring abut against the inner side of the valve cover.

[0015] The one or more technical solutions provided in the application have at least the following technical effects:

[0016] The plug axial compression structure provided in the application comprises a plug upper rod, a plug compression ring, a plug compression cover, a steel ball, an elastic member and a compression block. The elastic member and the steel ball are arranged in the plug upper rod to position the plug upper rod in the axial direction. Since the steel ball can abut against the second inclined surface of the compression block, the steel ball provides a downward component force to the compression block, so that the compression block compresses the packing compression cover, and the packing compression cover transmits the force to the upper scraping ring and the lower scraping ring, so that the upper scraping ring and the lower scraping ring are extruded in the axial direction, thereby realizing good sealing of the packing assembly. Furthermore, the plug compression ring is matched with the stepped surface of the plug upper rod through the spherical surface structure, so that the compression force is transmitted to the axis of the plug upper rod, and the pressure applied by the steel ball to the compression block is more uniform, thereby further improving the sealing effect. The application solves the problems of uneven axial compression force of the packing assembly, easy warping of the compression force transmission, valve opening and closing jamming and low sealing reliability caused by the bolt fastening mode in the prior art, so that the packing assembly is continuously and uniformly compressed, thereby improving the sealing reliability of the valve, eliminating the operation jamming, and prolonging the service life of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 FIG. 1 is a schematic view of a plug axial compression structure provided in the application;

[0019] Figure 2 FIG. 2 is an A-A sectional view of the plug axial compression structure of FIG. 1; Figure 1

[0020] Figure 3 ​An isometric view of the compression block provided for the embodiments of the present application;

[0021] Figure 4 A front view of the compression block provided for the embodiments of the present application;

[0022] Figure 5 A B-B sectional view of the compression block provided for the embodiments of the present application; Figure 4

[0023] Figure 6 A schematic view of the upper and lower scraping rings provided for the embodiments of the present application.

[0024] Figure: 1 - upper stem of the plug; 2 - compression ring of the plug; 3 - compression cover of the plug; 4 - steel ball; 5 - compression block; 51 - first inclined surface; 52 - second inclined surface; 53 - mounting groove; 6 - elastic member; 7 - plug body; 8 - valve body; 90 - valve cover; 91 - packing assembly; 911 - upper scraping ring; 912 - lower scraping ring; 92 - packing compression cover; 93 - sealing member; 94 - fastener; 95 - wear-reducing pad. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] ​The plug valve switches the flow path by rotating the plug body 7. Due to its own weight, the pressure on the seal 93 in the circumferential direction of the plug body 7 is uneven. That is, the seal 93 at the bottom of the plug body 7 is subjected to greater pressure, and the seal 93 is prone to failure after long-term operation.

[0028] This utility model embodiment provides a plug axial pressing structure, such as Figures 1-6 As shown, the valve includes a plug upper rod 1, a plug ring 2, a plug cap 3, a steel ball 4, and a pressure block 5; the plug upper rod 1 is connected to the plug body 7 and extends out of the valve body 8; a valve cover 90 is fitted on the outside of the plug upper rod 1 and is connected to the valve body 8; a packing assembly 91 is provided between the valve cover 90 and the plug upper rod 1; a packing cap 92 is fitted on the outside of the plug upper rod 1, and the end of the packing cap 92 abuts against the packing assembly 91; the pressure block 5 is fitted on the outside of the plug upper rod 1, and the end of the pressure block 5 abuts against the end of the packing cap 92 away from the packing assembly 91; the plug... A sealing element 93 is provided between the body 7 and the valve cover 90; an installation hole is provided in the radial direction of the upper rod 1 of the plug body; a steel ball 4 is slidably connected in the installation hole, and the steel ball 4 can extend out of the installation hole and abut against the corresponding mating surface on the pressure block 5; the plug ring 2 and the plug cap 3 are sequentially sleeved on the outside of the upper rod 1 of the plug body, and the plug ring 2 is located between the plug cap 3 and the pressure block 5; the plug ring 2 is engaged with the stepped surface of the upper rod 1 of the plug body through a spherical structure; the end of the plug cap 3 near the valve cover 90 abuts against the plug ring 2, and the plug cap 3 is connected to the valve cover 90 by a fastener 94.

[0029] For example, the plug cap 3 is used to transmit the clamping force; the fastener 94 passes through the through hole on the plug cap 3 and is connected to the valve cover 90. Since the plug ring 2 is engaged with the stepped surface of the upper rod 1 of the plug body through the spherical structure, the clamping force can be concentrated on the axis of the upper rod 1 of the plug body, thereby forming a complete and reasonably stressed clamping structure.

[0030] For example, a packing assembly 91 is provided between the valve cover 90 and the upper rod 1 of the plug body to prevent media leakage.

[0031] For example, the end of the packing gland 92 abuts against the packing assembly 91, and the end of the pressure block 5 abuts against the packing gland 92, thereby forming a multi-stage compression structure.

[0032] For example, the number of steel balls 4 corresponds to the number of mounting holes, and there are no fewer than three steel balls 4. The steel balls 4 are evenly arranged in the circumferential direction of the rod 1 on the plug body. The number of steel balls 4 can also be a multiple of two, such as four, six or eight, etc.

[0033] In the embodiments of this application, such as Figures 1-6 As shown, it also includes an elastic element 6; the elastic element 6 is disposed in the mounting hole; one end of the elastic element 6 is connected to the upper rod 1 of the plug body, and the other end of the elastic element 6 is connected to the steel ball 4.

[0034] For example, the elastic member 6 can provide the steel ball 4 with a continuous elastic force.

[0035] In the embodiment of the present application, as shown in the figure, Figures 1-6 The pressing block 5 is provided with a first inclined surface 51, and the steel ball 4 can extend out of the mounting hole and abut against the first inclined surface 51.

[0036] In the embodiment of the present application, as shown in the figure, Figures 1-6 The pressing block 5 is also provided with a second inclined surface 52, and the steel ball 4 can extend out of the mounting hole and abut against the second inclined surface 52.

[0037] For example, the included angle between the first inclined surface 51 and the axis of the plug upper rod 1 is smaller than the included angle between the second inclined surface 52 and the axis of the plug upper rod 1.

[0038] For example, the first inclined surface 51 is relatively steep, and the second inclined surface 52 is relatively flat, thereby achieving the technical effects of staged compression and reliable self-locking. During installation, when the steel ball 4 finally enters the flat second inclined surface 52, it is difficult for the steel ball 4 to move on the steep first inclined surface 51 and needs to overcome a large resistance. Therefore, after installation is completed, the pressing block 5 forms a reliable axial self-locking through the second inclined surface 52 and the first inclined surface 51, effectively preventing the pressing block 5 from falling off during vibration, thereby ensuring the stability during installation, greatly improving the reliability and service life of the valve seal, and achieving rapid installation of the valve.

[0039] In the embodiment of the present application, as shown in the figure, Figures 1-6 The end of the pressing block 5 towards the valve cover 90 is provided with a mounting groove 53; the opening of the mounting groove 53 faces the packing gland 92, and the end of the mounting groove 53 extends to the first inclined surface 51; the first inclined surface 51 is connected with the second inclined surface 52; when the pressing block 5 is in the compression position, the steel ball 4 abuts against the second inclined surface 52 and is configured to exert a component force on the pressing block 5 pointing towards the packing gland 92.

[0040] For example, when installing the pressing block 5, the mounting groove 53 is aligned with the steel ball 4, when the steel ball 4 reaches the end of the mounting groove 53, the pressing block 5 is rotated to make the steel ball 4 abut against the first inclined surface 51, when the pressing block 5 moves towards the packing gland 92, the steel ball 4 moves towards the second inclined surface 52, when the pressing block 5 abuts against the packing gland 92, the steel ball 4 abuts against the second inclined surface 52, at this time, the steel ball 4 is configured to exert a downward component force on the pressing block 5, so that the pressing block 5 compresses the packing gland 92.

[0041] The first inclined surface 51 of the pressing block 5 is used for initial positioning, and the second inclined surface 52 of the pressing block 5 is used for working state compression. An installation groove 53 is arranged at one end of the pressing block 5 close to the valve cover 90, and one end of the installation groove 53 is in communication with the packing gland 92, and the other end extends to the first inclined surface 51. When the pressing block 5 is installed, first, the installation groove 53 is aligned with the steel ball 4, when the steel ball 4 reaches the end of the installation groove 53, the pressing block 5 is rotated to make the steel ball 4 abut against the first inclined surface 51, when the pressing block 5 moves towards the packing gland 92, the steel ball 4 moves towards the second inclined surface 52, when the pressing block 5 completely abuts against the packing gland 92, the steel ball 4 abuts against the second inclined surface 52, in this working state, the steel ball 4 generates a downward component force on the pressing block 5, so that the pressing block 5 continuously compresses the packing gland 92, thereby ensuring that the packing assembly 91 obtains uniform and stable axial compression force.

[0042] The installation groove 53 and the first inclined surface 51 are provided with a circular arc, which can make the steel ball 4 smoothly transition to the first inclined surface 51.

[0043] In the embodiment of the application, as shown in the figure, Figures 1-6 One end of the plug compression ring 2 close to the valve cover 90 is provided with a concave structure, and the stepped surface of the plug upper rod 1 is provided with a convex structure. Through the cooperation of the convex structure and the concave structure, the compression force of the plug compression ring 2 on the plug upper rod 1 is concentrated and transmitted to the axis of the plug upper rod 1 along the normal direction of the concave structure or the convex structure.

[0044] The middle part of the plug upper rod 1 is designed as a stepped surface, which is designed as a convex lens shape. The inner side of the corresponding surface of the plug compression ring 2 is designed as a compression surface, which is designed as a concave lens shape. The convex lens and the concave lens cooperate with each other, so that the compression force can be concentrated and transmitted to the axis of the plug upper rod 1 through the cooperation of the convex lens and the concave lens.

[0045] The machining tolerance of the stepped surface of the plug upper rod 1 is designed as ±0.2mm, and the surface roughness is not greater than Ra1.6μm.

[0046] In the embodiment of the application, as shown in the figure, Figures 1-6 The spherical diameters of the concave structure and the convex structure are the same.

[0047] In the embodiment of the application, as shown in the figure, Figures 1-6 The plug compression ring 2 and the plug gland 3 are provided with a wear-reducing pad 95.

[0048] The wear-reducing pad 95 is arranged between the rotatable plug compression ring 2 and the fixed plug gland 3, and is used for reducing wear.

[0049] In the embodiment of the application, as shown in the figure, Figures 1-6As shown, the packing assembly 91 comprises an upper scraping ring 911 and a lower scraping ring 912; the upper scraping ring 911 and the lower scraping ring 912 are sequentially sleeved on the outer side of the plug upper stem 1; the upper scraping ring 911 and the lower scraping ring 912 abut against the inner side of the valve cover 90.

[0050] For example, the present application converts the radial force into uniform axial compression force by the cooperation of the steel ball 4 and the inclined surface of the pressing block 5, which not only solves the problem of uneven pressure of the sealing element 93 caused by the self-weight of the plug 7, but also improves the sealing effect of the packing assembly 91, and further, the spherical structure between the plug pressing ring 2 and the plug upper stem 1 can ensure the transmission of the compression force along the axis of the plug upper stem 1, preventing the plug 7 from being deflected, thereby reducing the jamming phenomenon in the operation of the valve. The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0051] The above examples are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A plug body axial compression structure, characterized by, The structure comprises a stem on plug (1), a plug compression ring (2), a plug compression cover (3), a steel ball (4) and a compression block (5); The stem on plug (1) is connected to the plug (7), and the stem on plug (1) extends out of the valve body (8); The valve cover (90) is sleeved on the outer side of the stem on plug (1), and the valve cover (90) is connected with the valve body (8); The valve cover (90) and the stem on plug (1) are provided with a packing assembly (91); The outer side of the stem on plug (1) is sleeved with a packing gland (92), and the end of the packing gland (92) is in abutment with the packing assembly (91); The compression block (5) is sleeved on the outer side of the stem on plug (1), and the end of the compression block (5) is in abutment with the end of the packing gland (92) away from the packing assembly (91); The plug (7) and the valve cover (90) are provided with a sealing element (93); A mounting hole is formed in the radial direction of the stem on plug (1); The steel ball (4) is slidingly connected in the mounting hole, and the steel ball (4) can extend out of the mounting hole and abut against the corresponding matching surface on the compression block (5); The plug compression ring (2) and the plug compression cover (3) are sequentially sleeved on the outer side of the stem on plug (1), and the plug compression ring (2) is arranged between the plug compression cover (3) and the compression block (5); The plug compression ring (2) is matched with the stepped surface of the stem on plug (1) through a spherical surface structure; The end of the plug compression cover (3) close to the valve cover (90) is in abutment with the plug compression ring (2), and the plug compression cover (3) is connected with the valve cover (90) through a fastener (94).

2. The plug axial compression structure according to claim 1, characterized in that, Further comprising an elastic element (6); The elastic element (6) is arranged in the mounting hole; One end of the elastic element (6) is connected with the stem on plug (1), and the other end of the elastic element (6) is connected with the steel ball (4).

3. The plug axial compression structure according to claim 1, wherein The compression block (5) is provided with a first inclined surface (51), and the steel ball (4) can extend out of the mounting hole and abut against the first inclined surface (51).

4. The plug axial compression structure according to claim 3, characterized in that The compression block (5) is further provided with a second inclined surface (52), and the steel ball (4) can extend out of the mounting hole and abut against the second inclined surface (52).

5. The plug axial compression structure according to claim 4, wherein, An installation groove (53) is formed at the end of the compression block (5) towards the valve cover (90); The opening of the installation groove (53) faces the packing gland (92), and the terminal end of the installation groove (53) extends to the first inclined surface (51); The first inclined surface (51) is connected with the second inclined surface (52); When the compression block (5) is in the compression position, the steel ball (4) abuts against the second inclined surface (52) and is configured to exert a force on the compression block (5) pointing to the packing gland (92).

6. The plug axial compression structure of claim 1, wherein The end of the plug compression ring (2) close to the valve cover (90) is provided with a concave structure; The stepped surface of the stem on plug (1) is provided with a convex structure; Through the cooperation of the convex structure and the concave structure, the compression force of the plug compression ring (2) on the plug upper stem (1) is concentratedly transmitted to the axis of the plug upper stem (1) along the normal direction of the concave structure or the convex structure.

7. The plug axial compression structure according to claim 6, characterized in that The spherical diameter of the concave structure and the convex structure is the same.

8. The plug axial compression structure of claim 1 wherein, A wear-reducing pad (95) is arranged between the plug compression ring (2) and the plug compression cover (3).

9. The plug axial compression structure of claim 1 wherein, The packing assembly (91) comprises an upper scraping ring (911) and a lower scraping ring (912). The upper scraping ring (911) and the lower scraping ring (912) are sequentially sleeved outside the plug upper stem (1). The upper scraping ring (911) and the lower scraping ring (912) abut against the inner side of the valve cover (90).

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