Check valve packing sealing device

Abstract

The utility model relates to the technical field of check valves, in particular to a check valve packing sealing device which comprises a valve body, a pin shaft hole is formed in the upper end of the valve body, a pin shaft is arranged in the pin shaft hole, a packing shaft is arranged in the pin shaft hole, and a packing gland is arranged at the upper end of the packing shaft. The upper end of the valve body is provided with a positioning assembly used for positioning the packing gland. A fixing assembly used for fixing the packing gland is arranged at the upper end of the valve body. Limiting on the packing gland can be relieved only by pulling the limiting plate and the sliding block in the fixing assembly, packing is convenient to replace, the maintenance and replacement process is greatly simplified, and operation difficulty and time cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a check valve packing sealing device. Background Technology

[0002] A search revealed a patent publication number: "CN205663979U" for a packing sealing device for an inclined valve disc check valve. The device includes a valve body, a valve seat, a valve disc, and a pin. The valve body contains a valve and a valve disc. A through hole is provided in the valve body, and a valve cover is located within the through hole. A support plate is located above the valve cover, and the support plate is fastened to the valve cover by studs and nuts. A quarter-ring, a pressure sealing ring, and a pressure equalizing ring are provided between the support plate and the valve cover. The valve disc contains a pin, which passes through the valve disc and has both ends placed within the valve body. A pin hole is located above the pin, and a packing shaft is located within the pin hole. The packing shaft has a convex cross-section and does not contact the top of the pin. Packing is provided between the packing shaft and the through hole. A concave packing gland is located above the packing and is fixed to the valve body by fastening bolts. The beneficial effects of this invention are: it can reduce external leakage from the valve body while not affecting the free rotation of the pin; the structure is simple, easy to process, and improves sealing performance.

[0003] Although the packing design can reduce external leakage from the valve body without affecting the free rotation of the pin, the packing gland is fixed with bolts, and disassembly and assembly require corresponding tools, which has limitations. Furthermore, the bolts are prone to corrosion after long-term use, which is not conducive to the disassembly and assembly of the bolts. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a check valve packing sealing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A check valve packing sealing device includes a valve body, an upper end of which has a pin hole, a pin is disposed inside the pin hole, a packing shaft is disposed inside the pin hole, a packing receiving groove is disposed outside the packing shaft, the packing receiving groove is filled with packing, a packing gland is disposed at the upper end of the packing shaft, a positioning assembly for positioning the packing gland is disposed at the upper end of the valve body, the positioning assembly includes two positioning rods fixedly installed at the upper end of the valve body, two positioning holes are symmetrically disposed on the side wall of the packing gland, a fixing assembly for fixing the packing gland is disposed at the upper end of the valve body, the fixing assembly includes a slide groove disposed at the upper end of the valve body, a crossbar is rotatably connected inside the slide groove, a slider is sleeved on the crossbar, the slider and the slide groove are elastically connected by a spring, a limiting plate is slidably connected at the upper end of the valve body, and the limiting plate is fixedly connected to the slider.

[0007] To better achieve the above objectives, the present invention adopts a further technical solution: the longitudinal section of the limiting plate is an L-shaped structure, and the whole is an arc-shaped structure.

[0008] To better achieve the above objectives, this utility model adopts a further technical solution: the lower section diameter of the pin hole is smaller than the upper section diameter, which is used for the installation of the packing shaft.

[0009] The beneficial effects of this utility model are:

[0010] The packing material, which fills the packing groove on the outside of the packing shaft, effectively seals the fluid inside the valve body. The packing is made of elastic and wear-resistant materials such as graphite, asbestos, or polytetrafluoroethylene (PTFE), and can tightly adhere to the outside of the packing shaft and the inner wall of the pin hole under fluid pressure, forming a robust sealing barrier that effectively prevents fluid leakage.

[0011] The packing gland, packing shaft, and packing are all easily disassembled and replaced. When users find that the packing has lost its sealing effect due to wear or aging, they can simply pull the limiting plate and slider in the fixing assembly to release the restriction on the packing gland, then easily open the packing gland, remove the old packing shaft and packing, and replace them with new parts. This greatly simplifies the maintenance and replacement process and reduces the difficulty and time cost of operation.

[0012] The packing gland is initially positioned by engaging two positioning rods with two positioning holes on its side wall. This design ensures the correct position of the packing gland during installation and prevents it from moving or shifting during operation. Meanwhile, the fixing assembly effectively secures the packing gland through the coordinated action of components such as grooves, crossbars, sliders, and springs. The L-shaped structure and arc-shaped design of the limiting plate ensure that it smoothly conforms to the upper end of the valve body during sliding, further enhancing the stability of the fixation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a check valve packing sealing device proposed in this utility model;

[0014] Figure 2 This is a top view of a check valve packing sealing device proposed in this utility model;

[0015] Figure 3 This is a cross-sectional view of a check valve packing sealing device proposed in this utility model.

[0016] In the diagram: 1 Valve body, 2 Pin, 3 Positioning rod, 4 Limiting plate, 5 Positioning hole, 6 Slide groove, 7 Spring, 8 Packing gland, 9 Crossbar, 10 Packing, 11 Packing shaft, 12 Packing storage groove, 13 Pin hole. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] Reference Figures 1-3 A check valve packing sealing device includes a valve body 1. A pin hole 13 is provided at the upper end of the valve body 1. A pin 2 is disposed inside the pin hole 13, and a packing shaft 11 is disposed inside the pin hole 13. The lower diameter of the pin hole 13 is smaller than the upper diameter, which is used for the installation of the packing shaft 11, facilitating its secure installation. A packing receiving groove 12 is provided on the outer side of the packing shaft 11, and the packing receiving groove 12 is filled with packing 10. The packing 10 is typically made of a material with elasticity and wear resistance, such as graphite, asbestos, or polytetrafluoroethylene, to provide a reliable sealing effect. When fluid passes through the valve body 1, the packing 10 is subjected to flow... The packing 10 is pressed tightly against the outer side of the packing shaft 11 and the inner wall of the pin hole 13, forming an effective sealing barrier to prevent fluid leakage. A packing gland 8 is provided at the upper end of the packing shaft 11 to compress the packing 10 and ensure that it is tightly fitted between the packing shaft 11 and the pin hole 13. A positioning assembly for positioning the packing gland 8 is provided at the upper end of the valve body 1. The positioning assembly includes two positioning rods 3 fixedly installed at the upper end of the valve body 1. Two positioning holes 5 are symmetrically arranged on the side wall of the packing gland 8. These two positioning holes 5 cooperate with the two positioning rods 3 fixedly installed at the upper end of the valve body 1 to achieve the initial positioning of the packing gland 8. The positioning rod 3 not only helps ensure the correct position of the packing gland 8 during installation, but also prevents it from moving or misaligning during operation. The upper end of the valve body 1 is equipped with a fixing assembly for securing the packing gland 8. This assembly includes a slide groove 6 located at the upper end of the valve body 1. A crossbar 9 is rotatably connected inside the slide groove 6, and a slider is fitted onto the crossbar 9. The slider and the slide groove 6 are elastically connected by a spring 7. A limiting plate 4 is slidably connected to the upper end of the valve body 1. The limiting plate 4 is fixedly connected to the slider. The limiting plate 4 has an L-shaped longitudinal section and an overall arc-shaped structure, which helps ensure that the limiting plate 4 can smoothly fit against the upper end of the valve body 1 during sliding. When it is necessary to fix the packing gland 8, the user can adjust the position of the slider on the crossbar 9, thereby moving the limiting plate 4 above the packing gland 8. Then, the elastic force of the spring 7 firmly fixes the limiting plate 4 to the upper end of the valve body 1, thus effectively fixing the packing gland 8.

[0019] Over time, the packing 10 may lose its sealing effect due to wear or aging. In this case, the user can release the restriction on the packing gland 8 by pulling the limiting plate 4 and the slider in the fixing assembly, then open the packing gland 8, remove the old packing shaft 11 and packing 10, replace the new packing 10 and restore its sealing performance; then put the packing gland 8 on and compress the packing 10, and then position the packing gland 8 through the cooperation of the positioning hole 5 and the positioning rod 3. Finally, release the limiting plate 4, and the limiting plate 4 will reset under the action of the spring 7 to fix the packing gland 8.

Claims

1. A check valve packing sealing device, characterized in that: The valve body (1) includes a valve body (1), the upper end of which has a pin hole (13). A pin (2) is disposed inside the pin hole (13). A packing shaft (11) is disposed inside the pin hole (13). A packing receiving groove (12) is disposed outside the packing shaft (11). The packing receiving groove (12) is filled with packing (10). A packing gland (8) is disposed at the upper end of the packing shaft (11). A positioning assembly for positioning the packing gland (8) is disposed at the upper end of the valve body (1). The positioning assembly includes components fixedly installed on the valve body (1). 1) Two positioning rods (3) at the upper end, two positioning holes (5) are symmetrically arranged on the side wall of the packing gland (8), and a fixing component for fixing the packing gland (8) is provided at the upper end of the valve body (1). The fixing component includes a slide groove (6) at the upper end of the valve body (1). A crossbar (9) is rotatably connected inside the slide groove (6). A slider is sleeved on the crossbar (9). The slider and the slide groove (6) are elastically connected by a spring (7). A limiting plate (4) is slidably connected at the upper end of the valve body (1). The limiting plate (4) is fixedly connected to the slider.

2. The check valve packing sealing device according to claim 1, characterized in that, The longitudinal section of the limiting plate (4) is L-shaped, and the whole is an arc-shaped structure.

3. The check valve packing sealing device according to claim 1, characterized in that, The lower section diameter of the pin hole (13) is smaller than the upper section diameter, and is used for the installation of the packing shaft (11).

Images