Low-temperature lengthened stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a low-temperature lengthened stop valve which comprises a valve body, a threaded valve rod is installed at the upper end of the valve body, a heat insulation cylinder is fixedly connected to the upper end of the threaded valve rod, a rotating shaft is arranged on the heat insulation cylinder in a penetrating mode, and the rotating shaft is connected with the heat insulation cylinder in a sliding mode. The upper end of the rotating shaft is fixedly connected with a hand wheel; and the connecting mechanism is used for connecting the rotating shafts, the connecting mechanism comprises a connecting plate fixedly connected to the outer side of the rotating shaft, the lower end of the connecting plate is elastically connected with the interior of the thermal insulation cylinder through a spring, and the lower end of the rotating shaft is fixedly connected with a cross-shaped inserting block. The long valve rod is arranged to be matched with the non-contact of the rotating shaft and the threaded valve rod, so that the overall temperature conductivity is reduced, and the situation that a user feels uncomfortable due to the low temperature of the hand wheel during use is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a low-temperature extended gate valve. Background Technology

[0002] In daily work, it has been found that during the use of the shut-off valve, the low-temperature medium inside the shut-off valve can easily carry away the heat inside the shut-off valve, resulting in a low temperature of the handwheel on the shut-off valve. When adjusting the working state of the shut-off valve with the handwheel, the low surface temperature of the handwheel can easily cause discomfort to the operator.

[0003] Utility model patent CN218971971U discloses a low-temperature extended rod stop valve, including a valve body and a handwheel. The arc surface of the valve body is connected to and fixed with an extended tube. A valve rod is threaded into the inner wall of the extended tube. The upper end of the valve rod has a connecting structure, which includes a cylindrical block rotatably connected to the upper end of the valve rod. A slot is formed at the upper end of the cylindrical block, and a retaining plate is slidably connected to the inner wall of the slot. The retaining plate is fixedly connected to the handwheel. A limiting plate is slidably inserted inside the cylindrical block. The vertical cross-section of the limiting plate is "L"-shaped. The lower surface of the long arm of the limiting plate is slidably connected to the retaining plate, and an inclined surface is formed on the upper surface of the long arm of the limiting plate. A first spring is fixedly connected to the side of the short arm of the limiting plate near the cylindrical block. This utility model solves the problem that when adjusting the working state of the stop valve using a handwheel, the low surface temperature of the handwheel can easily cause discomfort to the operator.

[0004] However, in actual use, the above method requires the handwheel to be removed after each use, and then reinstalled when needed. This method is inconvenient for actual use. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-temperature extended shut-off valve.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A cryogenic extended shut-off valve includes a valve body, a threaded valve stem mounted on the upper end of the valve body, a heat insulation cylinder fixedly connected to the upper end of the threaded valve stem, a rotating shaft extending through the heat insulation cylinder, the rotating shaft being slidably connected to the heat insulation cylinder, and a handwheel fixedly connected to the upper end of the rotating shaft; a connecting mechanism for connecting the rotating shaft and the threaded valve stem, the connecting mechanism including a connecting plate fixedly connected to the outside of the rotating shaft, the lower end of the connecting plate being elastically connected to the inside of the heat insulation cylinder by a spring, a cross-shaped insert fixedly connected to the lower end of the rotating shaft, the upper end of the threaded valve stem extending into the inside of the heat insulation cylinder, and a cross groove formed at the upper end of the threaded valve stem, the cross groove cooperating with the cross-shaped insert.

[0008] To better achieve the above objectives, the present invention adopts a further technical solution: the threaded valve stem, rotating shaft, handwheel, and cross-shaped insert are all made of carbon steel.

[0009] To better achieve the above objectives, the present invention adopts a further technical solution: the connecting plate is located inside the insulation cylinder.

[0010] The beneficial effects of this utility model are: by using the long valve stem and the non-contact between the rotating shaft and the threaded valve stem, the overall thermal conductivity is reduced, thereby effectively avoiding the discomfort caused to the user due to the low temperature at the handwheel during use. In addition, the use of the cross-shaped insert and cross-shaped groove, as well as its carbon steel material, ensures that the strength of the rotating shaft is not affected. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a low-temperature extended shut-off valve proposed in this utility model;

[0012] Figure 2 for Figure 1 Partial sectional view;

[0013] Figure 3 for Figure 2 Enlarged view of the upper half.

[0014] In the diagram: 1. Valve body, 2. Threaded valve stem, 3. Insulation cylinder, 4. Rotating shaft, 5. Handwheel, 6. Connecting plate, 7. Spring, 8. Cross-shaped insert, 9. Cross groove. Detailed Implementation

[0015] 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.

[0016] Reference Figure 1-Figure 3As shown, a low-temperature extended shut-off valve includes a valve body 1. A threaded valve stem 2 is installed at the upper end of the valve body 1. The threaded valve stem 2 has a longer rod body, resulting in greater heat loss and poorer thermal conductivity. A heat insulation cylinder 3 is fixedly connected to the upper end of the threaded valve stem 2. The heat insulation cylinder 3 is made of high-strength heat-insulating plastic, such as polytetrafluoroethylene, which has good heat insulation performance. A rotating shaft 4 is installed through the heat insulation cylinder 3 and is slidably connected to the heat insulation cylinder 3. A handwheel 5 is fixedly connected to the upper end of the rotating shaft 4. The valve body also includes a connecting mechanism for connecting the rotating shaft 4 and the threaded valve stem 2. The connecting mechanism includes a connecting plate 6 fixedly connected to the outside of the rotating shaft 4. The connecting plate 6 is located inside the heat insulation cylinder 3. The lower end of the connecting plate 6 is elastically connected to the inside of the heat insulation cylinder 3 by a spring 7. A cross-shaped insert 8 is fixedly connected to the lower end of the rotating shaft 4. The upper end of the threaded valve stem 2 extends into the inside of the heat insulation cylinder 3. A cross groove 9 is opened at the upper end of the threaded valve stem 2, and the cross groove 9 cooperates with the cross-shaped insert 8.

[0017] The threaded valve stem 2, rotating shaft 4, handwheel 5, and cross-shaped insert 8 are all made of carbon steel. This structure ensures the strength required for actual use.

[0018] In use, thanks to the spring 7, the rotating shaft 4 is not in contact with the threaded valve stem 2. Since the thermal insulation cylinder 3 has low thermal conductivity and air has very low thermal conductivity, the temperature on the threaded valve stem 2 will not be transferred to the rotating shaft 4. When the threaded valve stem 2 needs to be rotated, simply press down on the handwheel 5 to insert the cross-shaped insert 8 into the cross-shaped groove 9, allowing the threaded valve stem 2 to rotate. After rotation is complete, release the rotating shaft 4. Under the elastic action of the spring 7, the connecting plate 6 will cause the rotating shaft 4 and the handwheel 5 to move upwards, achieving the purpose of thermal insulation.

Claims

1. A cryogenic extended shut-off valve, characterized in that, include: A valve body (1) is provided with a threaded valve stem (2) installed at the upper end of the valve body (1). A heat insulation cylinder (3) is fixedly connected to the upper end of the threaded valve stem (2). A rotating shaft (4) is provided through the heat insulation cylinder (3). The rotating shaft (4) is slidably connected to the heat insulation cylinder (3). A handwheel (5) is fixedly connected to the upper end of the rotating shaft (4). A connecting mechanism is used to connect the rotating shaft (4) and the threaded valve stem (2). The connecting mechanism includes a connecting plate (6) fixedly connected to the outside of the rotating shaft (4). The lower end of the connecting plate (6) is elastically connected to the inside of the heat insulation cylinder (3) by a spring (7). A cross-shaped insert (8) is fixedly connected to the lower end of the rotating shaft (4). The upper end of the threaded valve stem (2) extends into the inside of the heat insulation cylinder (3). A cross groove (9) is provided at the upper end of the threaded valve stem (2). The cross groove (9) cooperates with the cross-shaped insert (8).

2. The cryogenic extended shut-off valve according to claim 1, characterized in that, The threaded valve stem (2), rotating shaft (4), handwheel (5) and cross-shaped insert (8) are all made of carbon steel.

3. The cryogenic extended shut-off valve according to claim 1, characterized in that, The connecting plate (6) is located inside the insulation cylinder (3).

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