Valve packing pre-tightening structure

Abstract

The utility model relates to valve technical field, concretely is a kind of valve packing pre-tightening structure, including bonnet and the sealing groove of the upper surface of bonnet being set, further include pre-tightening assembly, set in the upper of bonnet, the pre-tightening assembly includes the gland that movably sets in the outer side of valve stem, the gland lower surface is fixedly installed with pressure sleeve, the gland lower surface is set with receiving groove, the receiving groove inside slidingly embedded installation has enclosed ring, packing movably embedded installation is in the inside of sealing groove, the upper surface of bonnet is located in the outside of sealing groove and is set with enclosed groove, and enclosed groove is communicated with sealing groove, the enclosed ring is movably inserted with enclosed groove. In the utility model, before packing is extruded by pressure sleeve, enclosed ring is positioned to packing from the outside of packing, so that packing is compressed in sealing groove by pressure sleeve, to avoid the protruding part formed by packing edge especially bevelled cutout being extruded from sealing groove, improve the sealing effect of packing.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a valve packing pre-tightening structure. Background Technology

[0002] A typical valve includes a valve cover, valve stem, packing assembly, packing sleeve, packing gland, and support. The packing assembly is located between the valve stem and the valve cover. The valve packing preload structure consists of a packing gland, two bolts, and a packing sleeve. By rotating the bolts, a downward force is applied to the packing gland. This downward force is transmitted to the packing assembly via the packing sleeve, causing the packing assembly to be compressed and thus achieving preload.

[0003] The existing packing needs to be cut at an angle before being installed in the sealing groove so that it can be fitted onto the valve stem. This angled cut easily forms an upward convex structure. Since the packing itself is elastic, when multiple layers of packing are installed, this convex structure can easily cause the edge of the upper packing to exceed the sealing groove range. During the pressing process, the excess packing edge (especially the convex part formed by the angled cut) is easily squeezed out of the sealing groove, resulting in a decrease in sealing effect. Utility Model Content

[0004] The purpose of this invention is to provide a valve packing pre-tightening structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A valve packing preload structure includes a valve cover and a sealing groove formed on the upper surface of the valve cover, and further includes:

[0007] A pre-tightening assembly is disposed above the valve cover. The pre-tightening assembly includes a pressure cap that is movably sleeved on the outside of the valve stem. A pressure sleeve is fixedly installed on the lower surface of the pressure cap. A storage groove is opened on the lower surface of the pressure cap, and a closing ring is slidably embedded in the storage groove.

[0008] The packing material is movably embedded inside the sealing groove.

[0009] Furthermore, the valve cover has a first connecting lug symmetrically fixedly installed on its upper surface, and a bolt is movably inserted inside the first connecting lug. The pressure cover has a second connecting lug symmetrically fixedly installed on both sides, and the bolt moves through the second connecting lug at the corresponding position.

[0010] Preferably, a washer is movably fitted on the outside of the bolt above the second connecting lug, and a nut is screwed onto the outside of the bolt above the washer.

[0011] Furthermore, the valve cover has a sealing groove on its upper surface outside the sealing groove, and the sealing groove is connected to the sealing groove, and the sealing ring is movably inserted into the sealing groove.

[0012] Preferably, a plurality of top blocks are fixedly installed at equal angles on the upper surface of the closed ring, and a spring is movably provided on the upper surface of the closed ring between two top blocks. Both ends of the spring are fixedly installed with collars, and the two collars are respectively fixedly connected to one side surface inside the storage groove and the upper surface of the closed ring.

[0013] Furthermore, both the pressure cap and the pressure sleeve are composed of two identical metal parts symmetrically spliced ​​together.

[0014] Preferably, one end of a metal part of the cover has a symmetrically fixed insert block, and the other end of a metal part of the cover has a symmetrically opened slot, and the insert block is movably inserted into the slot at the corresponding position.

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

[0016] 1. By passing the bolt through the No. 2 connecting lug and tightening the nut, the No. 2 connecting lug and the No. 1 connecting lug are fixed, causing the gland to move down and be fixed. When the gland moves down, the spring pushes the sealing ring, causing the sealing ring to first insert into the sealing groove, confining the packing inside the sealing groove. Then the sealing ring remains stationary and is stored inside the receiving groove. The gland continues to move down, causing the pressure sleeve to squeeze the packing between the valve stem and the sealing ring, thereby preventing the protrusions formed by the oblique cut at the edge of the packing from being squeezed out of the sealing groove, thus improving the sealing effect of the packing.

[0017] 2. The movable insertion of the plug and slot allows for quick separation and installation of the two parts of the gland and the sleeve, facilitating rapid replacement when the gland and sleeve are damaged, thus reducing maintenance difficulty. Attached Figure Description

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

[0019] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the overall vertical cross-sectional structure of this utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the connection between the sealing ring and the receiving groove in this utility model.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the pressure cap in this utility model.

[0023] In the diagram: 1. Valve cover; 101. Sealing groove; 102. Sealing groove; 103. Connecting ear No. 1; 104. Bolt; 105. Nut; 106. Gasket; 2. Preload assembly; 201. Gland; 202. Gland sleeve; 203. Connecting ear No. 2; 204. Receiving groove; 205. Sealing ring; 206. Top block; 207. Spring; 208. Collar; 3. Insert block; 301. Slot; 4. Packing. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 In this embodiment of the present invention, a valve packing pre-tightening structure includes a valve cover 1 and a sealing groove 101 opened on the upper surface of the valve cover 1, and also includes a pre-tightening component 2, which is disposed above the valve cover 1. The pre-tightening component 2 includes a pressure cap 201 movably sleeved on the outside of the valve stem, a pressure sleeve 202 fixedly installed on the lower surface of the pressure cap 201, and a receiving groove 204 opened on the lower surface of the pressure cap 201. A closing ring 205 is slidably embedded in the receiving groove 204, and the packing 4 is movably embedded in the sealing groove 101.

[0026] Specifically, the packing 4 is placed inside the sealing groove 101, and then the packing 4 is squeezed by the pre-tightening component 2 moving down, so that the packing 4 fits the sealing groove 101 and the valve stem, and is compressed and sealed inside the sealing groove 101.

[0027] Example 1

[0028] like Figure 1-3 As shown, in this embodiment, a first connecting ear 103 is symmetrically fixedly installed on the upper surface of the valve cover 1. The first connecting ear 103 protrudes from the upper surface of the valve cover 1 and limits the pressure cap 201 when it is in contact with the second connecting ear 203 to avoid excessive compression of the packing 4. A bolt 104 is movably inserted inside the first connecting ear 103. The second connecting ear 203 is symmetrically fixedly installed on both sides of the pressure cap 201. The bolt 104 movably passes through the second connecting ear 203 at the corresponding position. A gasket 106 is movably sleeved on the outside of the bolt 104 above the second connecting ear 203. A nut 105 is screwed on the outside of the bolt 104 above the gasket 106.

[0029] In this embodiment, the bolt 104 is passed through the second connecting ear 203, and the nut 105 is turned to fix the second connecting ear 203 and the first connecting ear 103, thereby fixing the pressure cap 201.

[0030] like Figure 2-4 As shown, in this embodiment, a sealing groove 102 is provided on the upper surface of the valve cover 1 outside the sealing groove 101, and the sealing groove 102 is connected to the sealing groove 101. The sealing ring 205 is movably inserted into the sealing groove 102. Multiple top blocks 206 are fixedly installed at equal angles on the upper surface of the sealing ring 205. The top blocks 206 restrict the movement distance of the sealing ring 205 inside the receiving groove 204. A spring 207 is movably installed on the upper surface of the sealing ring 205 between two top blocks 206. The elastic force of the spring 207 is such that the sealing ring 205 has an outward force. Both ends of the spring 207 are fixedly installed with collars 208. The two collars 208 are fixedly connected to one side surface inside the receiving groove 204 and the upper surface of the sealing ring 205, respectively. The collars 208 make it easier to connect and fix the two ends of the spring 207.

[0031] In specific implementation, when the pressure cap 201 is lowered, the spring 207 pushes the sealing ring 205, so that the sealing ring 205 is first inserted into the sealing groove 102, restricting the packing 4 inside the sealing groove 101. Then the sealing ring 205 remains stationary and is stored inside the storage groove 204. The pressure cap 201 continues to move downward, so that the pressure sleeve 202 squeezes the packing 4 between the valve stem and the sealing ring 205, thereby preventing the protruding part formed by the oblique cut at the edge of the packing 4 from being squeezed out of the sealing groove 101 and improving the sealing effect of the packing 4.

[0032] Example 2

[0033] Based on Example 1, in order to address the problem that the pressure cap 201 is difficult to replace after damage,

[0034] like Figure 2 and Figure 5 As shown, in this embodiment, both the pressure cap 201 and the pressure sleeve 202 are composed of two identical metal parts symmetrically spliced ​​together; one end surface of one metal part of the pressure cap 201 is symmetrically fixed with a plug 3, and one end surface of the other metal part of the pressure cap 201 is symmetrically provided with a slot 301, and the plug 3 is movably inserted into the slot 301 at the corresponding position.

[0035] In practice, the two parts of the structure, the cover 201 and the sleeve 202, can be quickly separated and installed through the movable insertion of the plug 3 and the slot 301, which facilitates quick replacement when the cover 201 and the sleeve 202 are damaged, reducing the difficulty of maintenance.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A valve packing pre-tightening structure, comprising a valve cover (1) and a sealing groove (101) formed on the upper surface of the valve cover (1), characterized in that, Also includes: A pre-tightening assembly (2) is disposed above the valve cover (1). The pre-tightening assembly (2) includes a pressure cap (201) movably sleeved on the outside of the valve stem. A pressure sleeve (202) is fixedly installed on the lower surface of the pressure cap (201). A storage groove (204) is opened on the lower surface of the pressure cap (201). A closing ring (205) is slidably embedded in the storage groove (204). The filler (4) is movably embedded inside the sealing groove (101).

2. The valve packing pre-tightening structure according to claim 1, characterized in that, A first connecting lug (103) is symmetrically fixedly installed on the upper surface of the valve cover (1). A bolt (104) is movably inserted inside the first connecting lug (103). A second connecting lug (203) is symmetrically fixedly installed on both sides of the pressure cover (201). The bolt (104) movably passes through the second connecting lug (203) at the corresponding position.

3. The valve packing pre-tightening structure according to claim 2, characterized in that, A washer (106) is movably sleeved on the outside of the bolt (104) above the second connecting lug (203), and a nut (105) is screwed onto the outside of the bolt (104) above the washer (106).

4. The valve packing pre-tightening structure according to claim 1, characterized in that, The valve cover (1) has a sealing groove (102) on its upper surface outside the sealing groove (101), and the sealing groove (102) is connected to the sealing groove (101). The sealing ring (205) is movably inserted into the sealing groove (102).

5. The valve packing pre-tightening structure according to claim 4, characterized in that, Multiple top blocks (206) are fixedly installed at equal angles on the upper surface of the closed ring (205). A spring (207) is movably installed on the upper surface of the closed ring (205) between two top blocks (206). Both ends of the spring (207) are fixedly installed with collars (208). The two collars (208) are fixedly connected to one side surface inside the storage groove (204) and the upper surface of the closed ring (205), respectively.

6. The valve packing pre-tightening structure according to claim 1, characterized in that, Both the pressure cap (201) and the pressure sleeve (202) are composed of two identical metal parts symmetrically spliced ​​together.

7. The valve packing pre-tightening structure according to claim 6, characterized in that, A plug (3) is symmetrically fixedly installed on one end surface of a metal part of the cover (201), and a slot (301) is symmetrically opened on one end surface of another metal part of the cover (201). The plug (3) is movably inserted into the slot (301) at the corresponding position.

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