Packing gland for three-section steam extraction

Abstract

The utility model discloses a packing gland for three-section steam extraction, and relates to the technical field of three-section steam extraction of steam turbines. The device comprises a first pressing cover which is in a hollow cylinder shape and used for being arranged on a door rod in a sleeving mode, and a positioning mechanism is arranged on the top side of the first pressing cover; the second gland is in a hollow cylinder shape, is used for being arranged on a door rod in a sleeving mode and is coaxially arranged below the first gland; the inner diameter and the outer diameter of the first gland are the same as those of the second gland, and the bottom end of the second gland is used for pressing packing. The purposes of changing the packing gland and improving the safety and reliability of equipment are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of three-stage steam extraction of steam turbines, in particular to a packing gland used for three-stage steam extraction. Background Art

[0002] The industrial heating system is provided by the three-stage steam extraction of the steam turbines of units 1 and 2 respectively. Each unit can provide non-adjustable extraction steam of about 0.9-2 MPa to the industrial heating main pipe. The maximum industrial steam supply of each unit is 80t / h. The high-parameter steam extracted from the three-stage steam extraction is first reduced in pressure and then cooled in temperature, and finally enters the industrial heating main pipe to provide steam with certain parameters according to user needs.

[0003] When the three-stage steam is extracted to the packing position of the industrial steam supply electric door, steam leakage will occur frequently, and as the leakage continues, there will be a trend of deterioration, posing a risk of scalding. Utility Model Content

[0004] The utility model aims to provide a packing gland for three-stage steam extraction, so as to improve the packing gland and enhance the safety and reliability of the equipment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical means:

[0006] A packing gland for three-stage steam extraction, comprising:

[0007] The first gland is in the shape of a hollow cylinder and is used to be sleeved on the door rod, and a positioning mechanism is configured on the top side of the first gland;

[0008] The second gland is in the shape of a hollow cylinder, is used to be sleeved on the door rod, and is coaxially arranged below the first gland;

[0009] The inner and outer diameters of the first gland and the second gland are the same, and the bottom end of the second gland is used for pressing the packing.

[0010] Preferably, the positioning mechanism is a mounting ring coaxially arranged with the first gland, and the mounting ring is provided with a positioning hole extending along the axis thereof around the axis thereof.

[0011] Furthermore, a connecting packing is constructed between the first gland and the second gland, and the connecting packing is a graphite molded packing.

[0012] Furthermore, two ends of the connecting packing are fixedly connected to the bottom end of the first gland and the top end of the second gland respectively.

[0013] Furthermore, a slip ring is coaxially arranged on the inner wall of the mounting ring, an annular groove is coaxially arranged on the outer wall of the first pressure cover, and the slip ring is slidably installed in the annular groove.

[0014] Furthermore, the top surface of the mounting ring is configured with a first groove, the top end of the first pressure cover is configured with a second groove, the mounting ring and the first pressure cover are positioned and connected via a U-shaped buckle, and both ends of the U-shaped buckle are respectively embedded in the first groove and the second groove.

[0015] During use, the utility model has the following beneficial effects:

[0016] By adjusting the integrated packing gland to a two-stage type of the first gland and the second gland, the length of the single-stage gland is reduced. When the packing gland is used to compress the packing, even if the second gland located below is deflected during the compression process, after the first gland is installed, the deflection of the second gland can be corrected by using the first gland. The first gland not only plays a role in positioning and maintaining pressure, but also plays a role in aligning and adjusting the entire packing gland. It effectively avoids the problem of difficulty in adjustment after the bottom of the packing gland is deflected when only a long section of the packing gland is used. Thus, steam leakage caused by installation deviation can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0019] Among them, 1-first pressure cover, 2-positioning mechanism, 21-mounting ring, 22-positioning hole, 3-second pressure cover, 4-connecting packing, 5-slip ring, 6-annular slide groove, 7-first groove, 8-second groove, 9-U-shaped buckle. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to Figure 1 and Figure 2 As shown, a packing gland for three-stage steam extraction comprises:

[0027] The first gland 1 is in the shape of a hollow cylinder and is used to be sleeved on the door rod. The top side of the first gland 1 is configured with a positioning mechanism 2;

[0028] The second gland 3 is in a hollow cylindrical shape and is used to be sleeved on the door rod and is coaxially arranged below the first gland 1;

[0029] The inner and outer diameters of the first gland 1 and the second gland 3 are the same, and the bottom end of the second gland 3 is used to press the packing.

[0030] In this way, by adjusting the integrated packing gland to a two-stage type of the first gland 1 and the second gland 3, by reducing the length of the single-stage gland, when the packing is compressed by the packing gland, even if the second gland 3 located below is deflected during the compression process, after the first gland 1 is installed, the deflection of the second gland 3 can be corrected by using the first gland 1 installed properly. The first gland 1 not only plays a role in positioning and maintaining pressure, but also plays a role in aligning and adjusting the entire packing gland. It effectively avoids the problem of difficulty in adjustment after the bottom of the packing gland is deflected when only a longer one is used. Thereby effectively avoiding the steam leakage caused by the installation deviation.

[0031] Furthermore, the positioning mechanism 2 is a mounting ring coaxially arranged with the first gland 1, and the mounting ring is provided with a positioning hole extending along the axis thereof around the axis thereof.

[0032] Thus, bolts are inserted into the positioning holes to position the mounting ring and the external positioning seat, thereby completing the pressing and positioning of the first gland 1 and the second gland 3.

[0033] Furthermore, a connecting packing 4 is constructed between the first gland 1 and the second gland 3, and the connecting packing 4 is a graphite molded packing.

[0034] In this way, by utilizing the setting of the connecting packing 4, the entire packing gland can also form a second sealing portion between the first gland 1 and the second gland 3, and the connecting packing 4 can be utilized to improve the sealing performance of the entire packing gland.

[0035] Furthermore, two ends of the connecting packing 4 are fixedly connected to the bottom end of the first gland 1 and the top end of the second gland 3 respectively.

[0036] In this way, during the process of installing the first gland 1 and the second gland 3, after the second gland 3 is positioned, the first gland 1 can be rotated to allow the connecting packing 4 to wrap around the shaft, so that after the first gland 1 is positioned, the connecting packing 4 can have better sealing performance.

[0037] Furthermore, in order to avoid the problem that the positioning holes on the mounting ring and the threaded holes on the external positioning seat are misaligned during the winding process of the connecting packing 4, either the bolts cannot be installed or the connecting packing 4 cannot be tightly wound around the shaft.

[0038] A slip ring 5 is coaxially arranged on the inner wall of the mounting ring, and an annular sliding groove 6 is coaxially arranged on the outer wall of the first gland 1 . The slip ring 5 is slidably installed in the annular sliding groove 6 .

[0039] In this way, after the first gland 1 is rotated, the position of the positioning hole can be adjusted by rotating the mounting ring, so that the bolt can be accurately passed through the positioning hole and the threaded hole on the external positioning seat for installation and positioning.

[0040] Furthermore, in order to avoid unnecessary relative sliding between the first gland 1 and the mounting ring after the first gland 1 and the second gland 3 are installed and positioned, the tightly wound connection packing 4 may be loosened.

[0041] The top surface of the mounting ring is configured with a first groove 7, the top end of the first pressure cover 1 is configured with a second groove 8, the mounting ring and the first pressure cover 1 are positioned and connected via a U-shaped buckle 9, and the two ends of the U-shaped buckle 9 are respectively embedded in the first groove 7 and the second groove 8.

[0042] In this way, the first gland 1 and the mounting ring can be released and opened by disassembling and inserting the U-shaped buckle 9 .

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A packing gland for three-stage steam extraction, characterized in that: include: The first gland (1) is in the shape of a hollow cylinder and is used to be sleeved on the door rod. The top side of the first gland (1) is provided with a positioning mechanism (2); The second gland (3) is in the shape of a hollow cylinder and is used to be sleeved on the door rod and is coaxially arranged below the first gland (1); The inner and outer diameters of the first gland (1) and the second gland (3) are arranged to be the same, and the bottom end of the second gland (3) is used to press the packing.

2. The packing gland for three-stage steam extraction according to claim 1 is characterized in that: The positioning mechanism (2) is a mounting ring (21) coaxially arranged with the first gland (1), and the mounting ring (21) is provided with a positioning hole (22) extending along the axis thereof and surrounding the axis thereof.

3. The packing gland for three-stage steam extraction according to claim 2 is characterized in that: A connecting packing (4) is constructed between the first gland (1) and the second gland (3), and the connecting packing (4) is a graphite molded packing.

4. The packing gland for three-stage steam extraction according to claim 3 is characterized in that: The two ends of the connecting packing (4) are respectively fixedly connected to the bottom end of the first gland (1) and the top end of the second gland (3).

5. The packing gland for three-stage steam extraction according to claim 4 is characterized in that: A slip ring (5) is coaxially arranged on the inner wall of the mounting ring (21), and an annular sliding groove (6) is coaxially arranged on the outer wall of the first gland (1), and the slip ring (5) is slidably mounted in the annular sliding groove (6).

6. The packing gland for three-stage steam extraction according to claim 5, characterized in that: The top surface of the mounting ring (21) is configured with a first groove (7), and the top end of the first gland (1) is configured with a second groove (8). The mounting ring (21) and the first gland (1) are positioned and connected via a U-shaped buckle (9), and the two ends of the U-shaped buckle (9) are respectively embedded in the first groove (7) and the second groove (8).

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