Combined packing for knife gate valve

Abstract

According to the technical scheme, the combined packing for the knife gate valve is characterized by comprising a packing scraper, a packing pressing plate, a plurality of packing plates and packing sealing rubber, wherein the packing plates and the packing sealing rubber are located between the packing scraper and the packing pressing plate. And a scraper ring which can extend into the inner cavity of the valve body and is used for scraping the flashboard is arranged on the surface, far away from the filler pressing plate, of the filler scraper. The problems that in the prior art, filler is prone to damage, the needed torque is large, and the sealing performance is unstable are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of knife gate valves, and more specifically to a combined filler for knife gate valves. Background Art

[0002] The Chinese utility model patent with patent number CN211550718U discloses a packing combination structure of an ultra-low temperature gate valve, which includes a valve cover and a valve stem. The valve cover is perpendicular to the valve stem, and a spacing space is formed between the valve cover and the valve stem. A packing combination structure is arranged in the spacing space; the packing combination structure includes a packing sleeve and a packing assembly, the packing sleeve is slidably installed in the spacing space, and the packing assembly is located in the spacing space; a filling structure is slidably connected to the packing sleeve. Although it solves the problem of insufficient sealing of the existing ultra-low temperature gate valve when the packing has slight loss, there are still defects. During use, impurities will adhere to the end face of the gate, resulting in a rough surface of the gate. When the gate withdraws from the valve body, the impurities on the gate will scratch the packing, thereby damaging the packing assembly and affecting the sealing. At the same time, it will also cause a large resistance to the gate moving up, resulting in a larger torque required, affecting the opening efficiency of the gate. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a combined packing with a stable sealing structure and convenient for opening and closing of the gate.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a combined packing for a knife gate valve, comprising a packing scraper, a packing pressure plate, a plurality of packing plates and a packing sealing rubber located between the packing scraper and the packing pressure plate, wherein a scraper ring which can extend into the inner cavity of the valve body and is used to scrape the gate plate is arranged on the surface of the packing scraper away from the packing pressure plate.

[0005] As a further improvement of the utility model, the outer edge contour size of the scraper ring gradually decreases along the direction in which the filler scraper moves away from the filler pressure plate.

[0006] As a further improvement of the utility model, the cross-sections of several of the packing plates and packing sealing rubbers along their contour directions are V-shaped, and several of the packing plates and packing sealing rubbers can be plugged into each other, and a sealing groove for partially extending the packing plate or the packing sealing rubber is provided on the surface of the packing scraper facing the packing pressure plate, and a protrusion capable of extending the packing plate or the packing sealing rubber is provided on the surface of the packing pressure plate facing the packing scraper.

[0007] The beneficial effects of the utility model are as follows: the packing scraper, packing sealing rubber, packing plate and packing pressure plate are superimposed together, and the scraper ring on the packing scraper is used to scrape the knife gate plate. The design of the scraper ring scraping the knife gate plate can ensure the smoothness of the surface of the knife gate plate compared with the prior art, thereby facilitating the opening and subsequent closing of the knife gate plate, thereby reducing the required opening and closing torque, and at the same time, the smooth surface of the knife gate plate can slow down the wear of the packing sealing rubber and the packing plate, thereby extending the service life of the packing sealing rubber and the packing plate, and ensuring effective sealing; the combined design of the packing sealing rubber and the packing plate achieves the effect of soft and hard double sealing compared with the prior art design of a packing combination of only one material, ensuring the structural strength of the combined packing while also having a certain toughness, the packing sealing rubber can provide a buffering effect when impurities on the surface of the knife gate plate touch the scraper ring, thereby slowing down the deformation of the scraper ring and the packing scraper plate when subjected to external force, avoiding cracking of the scraper ring and the packing scraper plate, and extending the service life of the scraper ring and the packing scraper plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of a filler scraper in the utility model;

[0009] Figure 2 It is a schematic diagram of a packing plate in the utility model;

[0010] Figure 3 It is a schematic diagram of the packing sealing rubber in the utility model;

[0011] Figure 4 It is a schematic diagram of a packing pressure plate in the utility model;

[0012] Figure 5 This is a diagram showing the use of the utility model in a knife gate valve;

[0013] Figure 6 for Figure 5 Enlarged view of point E in the middle;

[0014] Figure 7 for Figure 5 Schematic diagram of the outer wall of the middle scraper ring when it is inclined.

[0015] Figure numerals: 1. packing scraper; 2. packing pressure plate; 3. packing plate; 4. packing sealing rubber; 5. scraper ring; 6. sealing groove; 7. raised part. 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 7As shown, a combined packing for a knife gate valve in this embodiment includes a packing scraper 1, a packing pressure plate 2, a plurality of packing plates 3 and a packing sealing rubber 4. A scraper ring 5 is arranged on one surface of the packing scraper 1. The maximum outline size of the scraper ring 5 is smaller than the outline size of the packing scraper 1. For the convenience of explanation, taking a packing plate 3 and a packing sealing rubber 4 as an example, the packing scraper 1, the packing sealing rubber 4, the packing plate 3 and the packing pressure plate 2 are stacked together in sequence and placed in the knife gate valve, and then the packing pressure plate 2 is pressed with a packing gland. At this time, the scraper ring 5 extends into the inner cavity of the valve body and scrapes There is a gap between the outer wall of the knife ring 5 and the inner wall of the valve body, the plate surface of the packing scraper 1 is in close contact with the valve body, and the knife gate plate passes through the scraper ring 5, the packing scraper 1, the packing sealing rubber 4, the packing plate 3 and the packing pressure plate 2 in sequence from the valve body to the valve body, and the packing sealing rubber 4 and the packing plate 3 can be radially extended by being pressed, and the outer walls of the packing sealing rubber 4 and the packing plate 3 can fit the inner wall of the valve body and the inner walls can fit the outer wall of the knife gate plate. During use, as the knife gate plate moves upward, the scraper ring 5 scrapes the material on the outer wall of the knife gate plate, and the scraped material falls into the valve body or moves to the outside of the scraper ring 5;

[0018] Compared with the prior art, the design of the scraper ring 5 for scraping the knife gate can ensure the smoothness of the knife gate surface, thereby facilitating the opening and subsequent closing of the knife gate, thereby reducing the required opening and closing torque. At the same time, the smooth surface of the knife gate can slow down the wear of the packing sealing rubber 4 and the packing plate 3, thereby extending the service life of the packing sealing rubber 4 and the packing plate 3 and ensuring effective sealing. Compared with the prior art design of the packing combination using only one material, the combined design of the packing sealing rubber 4 and the packing plate 3 achieves the effect of soft and hard double sealing, ensuring the structural strength of the combined packing while also having a certain toughness. The packing sealing rubber 4 can provide a buffering effect when impurities on the surface of the knife gate touch the scraper ring 5, thereby slowing down the deformation of the scraper ring 5 and the packing scraper 1 when subjected to external force, avoiding the cracking of the scraper ring 5 and the packing scraper 1, and extending the service life of the scraper ring 5 and the packing scraper 1.

[0019] It is further explained that, according to actual production requirements, the number of the packing sealing rubbers 4 and the packing plates 3 and the overlapping combination method can be changed to ensure that the desired effect is achieved.

[0020] As a specific implementation method of the improvement, refer to Figure 7As shown, the outer edge contour size of the scraper ring 5 gradually decreases in the direction from the filler scraper 1 away from the filler pressure plate 2, and the outer wall of the scraper ring 5 is inclined relative to the vertical plane. During the scraping process, impurities can quickly move along the outer wall of the scraper ring 5 to the surroundings of the scraper ring 5. Compared with the design in which the outer wall of the scraper ring 5 is perpendicular to the surface of the filler scraper 1, such a design can improve the structural strength of the scraper ring 5 and avoid the phenomenon that the scraper ring 5 is easily broken. At the same time, it can accelerate the movement of the scraped impurities to the surroundings of the scraper ring 5, thereby accelerating the falling of the impurities, slowing down the accumulation of impurities outside the scraper ring 5, and ensuring the normal scraping speed of the scraper ring 5.

[0021] As a specific implementation method of the improvement, refer to Figures 1 to 7 As shown, the cross-sections of several packing plates 3 and packing sealing rubbers 4 along their contour directions are all V-shaped, and several packing plates 3 and packing sealing rubbers 4 can be plugged into each other, and a sealing groove 6 for partially extending the packing plate 3 or the packing sealing rubber 4 is provided on the surface of the packing scraper 1 facing the packing pressure plate 2, and a protrusion 7 for extending into the packing plate 3 or the packing sealing rubber 4 is provided on the surface of the packing pressure plate 2 facing the packing scraper 1. Compared with the design in which the packing plate 3, the packing scraper 1, the packing pressure plate 2 and the packing sealing rubber 4 are all made into flat surfaces and fit each other, such a design can further improve the coaxiality and connection stability among the packing plate 3, the packing scraper 1, the packing pressure plate 2 and the packing sealing rubber 4, and at the same time, it can also improve the structural strength and bending resistance of the packing plate 3, the packing scraper 1, the packing pressure plate 2 and the packing sealing rubber 4 themselves.

[0022] 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 combined packing for a knife gate valve, characterized in that: The invention comprises a packing scraper (1), a packing pressure plate (2), a plurality of packing plates (3) located between the packing scraper (1) and the packing pressure plate (2), and a packing sealing rubber (4); a scraper ring (5) capable of extending into the inner cavity of a valve body and used for scraping material from a gate plate is arranged on the surface of the packing scraper (1) away from the packing pressure plate (2).

2. The combined packing for knife gate valve according to claim 1, characterized in that: The outer edge profile size of the scraper ring (5) gradually decreases along the direction in which the filler scraper (1) moves away from the filler pressing plate (2).

3. A combined packing for knife gate valve according to claim 1 or 2, characterized in that: The cross-sections of the plurality of packing plates (3) and packing sealing rubbers (4) along their contour directions are all V-shaped. The plurality of packing plates (3) and packing sealing rubbers (4) can be plugged into each other. A sealing groove (6) for partially inserting the packing plate (3) or the packing sealing rubber (4) is provided on the surface of the packing scraper (1) facing the packing pressure plate (2). A protrusion (7) capable of inserting the packing plate (3) or the packing sealing rubber (4) is provided on the surface of the packing pressure plate (2) facing the packing scraper (1).

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