Sealing structure for valve rod of fire valve

Abstract

The utility model discloses a fire valve rod sealing structure which comprises a valve rod body, an upper valve rod, a lower valve rod, a sealing groove and a sealing ring, the valve rod body is divided into the upper valve rod and the lower valve rod, and the lower end of the upper valve rod is rotationally connected with the lower valve rod; a sealing groove is formed in the upper valve rod, a sealing ring is arranged in the sealing groove in a sleeved mode, the upper valve rod is composed of a first rod body, a second rod body and a rotary knob block, the first rod body is connected to the upper portion of the second rod body, the rotary knob block is connected to the upper portion of the first rod body, and the sealing groove is located in the first rod body. The lower valve rod is composed of a third rod body and a sealing plate, the third rod body is connected to the upper portion of the sealing plate, an inner threaded hole structure matched with the outer threaded structure is formed in the third rod body, and the outer threaded structure is connected to the inner threaded hole structure in a threaded mode. Therefore, the abrasion degree of the sealing ring is reduced, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of fire valve stems, and in particular to the technical field of a fire valve stem sealing structure. Background Technology

[0002] Fire valves are an important accessory for controlling pipelines in industry and buildings. This lecture focuses on the practical application of fire valves. For detailed principles and structural cross-sectional views, please refer to relevant materials and books. Fire valves consist of three main parts: valve body, opening and closing mechanism, and valve cover. The fire valve stem is an important component of the fire valve.

[0003] However, the existing valve stem connection method on fire valves is not very safe, and the valve stem is not a single piece, so the strength of the valve stem is not very high. In addition, a lot of debris will adhere to the surface of the valve stem during use, which will affect the performance of the valve.

[0004] To address the problems mentioned above, for example, application number CN201822040973.4 discloses a novel sealed fire valve with an integral valve stem connection, comprising a valve body, a valve housing mounted on the top of the valve body, an upper valve stem mounted on the top of the valve housing, the bottom of the upper valve stem penetrating the valve housing, a lower valve stem penetrating the bottom of the upper valve stem, the bottom of the lower valve stem penetrating the valve body, and a valve ball penetrating the bottom of the lower valve stem. The upper valve stem, lower valve stem, and valve ball are respectively provided with a first circular hole, a second circular hole, and a third circular hole. Reinforcing ribs are cast inside the first, second, and third circular holes. This not only connects the upper valve stem, lower valve stem, and valve ball into a single unit, but the reinforcing ribs also increase the overall strength of the valve stem, facilitating the more practical use of the novel sealed fire valve with an integral valve stem connection.

[0005] For example, application number CN201520781576.6 discloses a sealed fire valve with an integral valve stem connection, including a valve body, a valve stem assembly, a tension spring, and a pressure handle. The valve body has an interconnected air inlet channel and an air outlet channel. One end of the valve stem assembly is located in the air inlet channel and connected to the tension spring, while the other end extends to the outside of the valve body and is connected to the pressure handle. The air inlet channel has a valve seat corresponding to the valve stem assembly. The pressure handle is hinged to the valve body. The valve stem assembly includes a valve stem and a valve core located at the end of the valve stem. The valve stem and valve core are integrally formed. The integrally designed valve stem and valve core have higher concentricity, so the performance of the entire valve stem assembly is more stable during operation. However, the above patents all have the following defects:

[0006] Although the above structure makes the valve stem a single piece and uses a sealing ring for sealing, making the valve stem assembly more stable during operation, the valve stem needs to move up and down and rotate simultaneously for each opening and closing, which leads to wear on the sealing ring, reduces the reliability of the seal, and significantly reduces the service life. Summary of the Invention

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a valve stem sealing structure for fire valves. This structure uses the upper valve stem and the lower valve stem in cooperation to reduce the wear of the sealing ring and thus improve the sealing performance.

[0008] To achieve the above objectives, this utility model proposes a fire valve stem sealing structure, including a valve stem body, an upper valve stem, a lower valve stem, a sealing groove, and a sealing ring. The valve stem body is divided into an upper valve stem and a lower valve stem, and the lower end of the upper valve stem is rotatably connected to the lower valve stem. A sealing groove is provided on the upper valve stem, and a sealing ring is fitted inside the sealing groove.

[0009] Preferably, the upper valve stem consists of a first rod body, a second rod body, and a knob block, with the first rod body connected above the second rod body, the knob block connected above the first rod body, and the sealing groove located on the first rod body.

[0010] Preferably, the outer wall of the second rod is provided with an external thread structure.

[0011] Preferably, the lower valve stem is composed of a third rod body and a sealing plate. The third rod body is connected above the sealing plate, and the interior of the third rod body has an internal threaded hole structure that is compatible with the external thread structure. The external thread structure is threadedly connected to the internal threaded hole structure.

[0012] Preferably, the sealing plate has a circular structure, and the outer diameter of the sealing plate is adapted to the inner diameter of the valve cavity of the fire valve.

[0013] Preferably, there are four sealing grooves and four sealing rings, with each sealing groove corresponding to each sealing ring.

[0014] The beneficial effects of this utility model are:

[0015] This invention improves the sealing performance of a valve through the combined action of an upper valve stem, a lower valve stem, a sealing groove, and a sealing ring. By threading the lower end of the upper valve stem into the internal threaded hole of the lower valve stem, rotating the knob in both directions causes the upper valve stem to rotate in both directions, which in turn causes the lower valve stem to move up and down, thus opening and closing the valve. Since the upper valve stem only rotates and does not move up and down, the wear on the sealing ring on the upper valve stem is greatly reduced, thereby improving the sealing effect, lowering maintenance costs, and extending the service life of the structure. This invention solves the problem that the valve stem needs to move up and down and rotate simultaneously for each opening and closing, which leads to wear on the sealing ring and reduced sealing performance. Attached Figure Description

[0016] Figure 1 This is a front view of a fire valve stem sealing structure according to this utility model;

[0017] Figure 2 This is a schematic diagram of the upper and lower valve stems of a fire valve stem sealing structure according to this utility model;

[0018] Figure 3 This is a schematic diagram of the sealing groove of a fire valve stem sealing structure according to this utility model;

[0019] In the diagram: 1-valve stem body, 101-upper valve stem, 1011-first rod body, 1012-second rod body, 10122-external thread structure, 1013-knob block, 102-lower valve stem, 1022-third rod body, 10222-internal thread hole structure, 1023-sealing plate, 2-sealing groove, 3-sealing ring. Detailed Implementation

[0020] See Figures 1 to 3 This utility model discloses a valve stem sealing structure for a fire valve, comprising a valve stem body 1, an upper valve stem 101, a lower valve stem 102, a sealing groove 2, and a sealing ring 3. The valve stem body 1 is divided into an upper valve stem 101 and a lower valve stem 102, with the lower valve stem 102 rotatably connected to the lower end of the upper valve stem 101. The upper valve stem 101 has a sealing groove 2, and a sealing ring 3 is fitted inside the sealing groove 2. In this application, the sealing ring 3 is located above the fire valve and is used to prevent fluid medium from leaking from the gap between the upper valve stem 101 and the valve cover, thereby ensuring the sealing performance of the valve.

[0021] See Figure 2The upper valve stem 101 is composed of a first rod body 1011, a second rod body 1012, and a knob block 1013. The first rod body 1011 is connected above the second rod body 1012, and the knob block 1013 is connected above the first rod body 1011. The sealing groove 2 is located on the first rod body 1011. When the operator rotates the knob block 1013 in both directions, the knob block 1013 can simultaneously drive the first rod body 1011 and the second rod body 1012 to rotate in both directions, thereby driving the lower valve stem 102 below to move up and down.

[0022] See Figure 2 The outer wall of the second rod 1012 is provided with an external thread structure 10122. By providing the external thread structure 10122, the upper valve rod 101 and the lower valve rod 102 can be threadedly connected. Thus, the rotation of the upper valve rod 101 drives the lower valve rod 102 to move up and down, thereby reducing the wear of the sealing ring 3.

[0023] See Figure 2 The lower valve stem 102 is composed of a third rod body 1022 and a sealing plate 1023. The third rod body 1022 is connected above the sealing plate 1023. The interior of the third rod body 1022 is provided with an internal threaded hole structure 10222 that is adapted to the external threaded structure 10122. The external threaded structure 10122 is threadedly connected to the internal threaded hole structure 10222. By setting the internal threaded hole structure 10222, the lower valve stem 102 is threadedly connected to the external threaded structure 10122 on the upper valve stem 101 through the internal threaded hole structure 10222, thereby driving the lower valve stem 102 to move up and down.

[0024] See Figure 2 The sealing plate 1023 has a circular structure, and the outer diameter of the sealing plate 1023 is adapted to the inner diameter of the valve cavity of the fire valve. When the upper valve stem 101 rotates, it drives the lower valve stem 102 to move up and down, thereby driving the sealing plate 1023 to move up and down in the valve cavity, thus achieving the opening and closing effect.

[0025] See Figure 3 There are four sealing grooves 2 and four sealing rings 3. Each sealing groove 2 corresponds to each sealing ring 3. By setting only four sealing rings 3 for sealing, there is no need for a pressure cap, which greatly reduces maintenance and replacement costs. At the same time, the upper valve stem 101 only rotates and does not move up and down, which greatly reduces the wear of the sealing rings 3 and thus improves the sealing effect.

[0026] The working process of this utility model:

[0027] In operation, the valve stem sealing structure of this utility model connects the lower end of the upper valve stem 101 to the internal threaded hole structure 10222 of the lower valve stem 102. When the operator rotates the knob block 1013 in both directions, the knob block 1013 drives the upper valve stem 101 to rotate in both directions, which in turn drives the lower valve stem 102 to move up and down, thereby opening and closing the valve. At the same time, since the upper valve stem 101 only rotates and does not move up and down, the wear of the sealing ring 3 on the upper valve stem 101 is greatly reduced, thereby improving the sealing effect, reducing maintenance costs, and extending the service life of the structure.

[0028] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A fire valve stem seal structure, characterized by: The utility model provides a valve stem body (1), upper valve stem (101), lower valve stem (102), sealing groove (2) and sealing ring (3), the valve stem body (1) is divided into upper valve stem (101) and lower valve stem (102), the lower end of upper valve stem (101) is rotatably connected with lower valve stem (102), upper valve stem (101) is equipped with sealing groove (2), sealing groove (2) is equipped with sealing ring (3) in the inside, upper valve stem (101) is composed of first rod body (1011), second rod body (1012) and knob block (1013), first rod body (1011) is connected in the upper of second rod body (1012), knob block (1013) is connected in the upper of first rod body (1011), and sealing groove (2) is located on first rod body (1011), the quantity of sealing groove (2) and sealing ring (3) is four respectively, and every sealing groove (2) corresponds every sealing ring (3) respectively.

2. A fire valve stem seal structure as defined in claim 1, wherein: The outer wall of the second rod body (1012) is provided with an external thread structure (10122).

3. A fire valve stem seal structure as defined in claim 2 wherein: The lower valve stem (102) is composed of a third rod body (1022) and a sealing plate (1023), the third rod body (1022) is connected above the sealing plate (1023), the third rod body (1022) is internally provided with an internal thread hole structure (10222) matched with the external thread structure (10122), and the external thread structure (10122) is threadedly connected to the internal thread hole structure (10222).

4. A fire valve stem seal structure as defined in claim 3 wherein: The sealing plate (1023) is in a circular structure, and the outer diameter of the sealing plate (1023) is matched with the inner diameter of the valve cavity of the fire valve.

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