Self-sealing filler structure of molten salt valve

Abstract

The utility model relates to a self-sealing filler structure of a molten salt valve. Comprising a lengthened support, a valve rod and a valve body, a center hole is formed in the upper end of the valve body, the valve rod is located in the center hole of the valve body, the lengthened support is connected to the valve rod in a sleeved mode, the lower end of the lengthened support is connected with the upper end of the valve body through a bolt, an upper stepped hole is formed in the upper end of the center hole, and an elastic piece connected to the valve rod in a sleeved mode is installed at the bottom in the upper stepped hole. The upper end of the elastic piece is provided with a packing seat ring connected to the valve rod in a sleeving mode, and the upper end of the packing seat ring is provided with a plurality of packing layers. Due to the fact that the multiple layers of packing are arranged, after the first layer of packing loses efficacy, other layers of packing can still play a sealing role, the upper end of the elastic piece exerts pressure upwards on the packing seat ring, the packing seat ring transmits the pressure to the multiple packing layers, the sealing performance between the multiple packing layers and the valve rod is enhanced, molten salt can be effectively prevented from leaking, and the sealing effect is good. The long-term use effect of the filler is ensured, and the service life of the molten salt valve is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to a molten salt valve, in particular to a self-sealing packing structure of a molten salt valve, belonging to the technical field of valves. Background Art

[0002] Valves are control components in fluid delivery systems, with functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest shutoff valves to the various valves used in extremely complex automatic control systems. Valves can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] Molten salt, as a heat transfer and heat storage medium with high heat capacity, has received extensive attention, and its operating temperature can reach 560°C. Molten salt is a high-temperature (greater than 500°C), high heat flux (greater than 105W / m2) and low-pressure (less than 2bar) heat transfer medium with low cost, long life and good heat transfer performance, which makes it have great advantages in industrial applications.

[0004] During the transportation of high-temperature molten salt, the pipeline is basically controlled by a molten salt valve. After a period of use, packing leakage will occur. During operation, the high-temperature molten salt will penetrate into the packing along the valve stem gap. After stopping operation, the molten salt remaining between the valve stem and the packing will form crystals due to the decrease in temperature. When used again, it will cause serious scratches on the valve stem and packing. Over time, the high-temperature molten salt will leak out from the sealing packing gland, affecting the safety and reliability of the entire system. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a self-sealing packing structure for a molten salt valve.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A self-sealing packing structure of a molten salt valve comprises an extended bracket, a valve stem and a valve body, wherein the upper end of the valve body is provided with a center hole, the valve stem is located in the center hole of the valve body, the extended bracket is sleeved on the valve stem, the lower end of the extended bracket is connected to the upper end of the valve body by bolts, an upper end of the center hole is provided with an upper stepped hole, an elastic member sleeved on the valve stem is installed at the bottom of the upper stepped hole, the upper end of the elastic member is provided with a packing seat ring sleeved on the valve stem, and the upper end of the packing seat ring is provided with a plurality of packing layers.

[0008] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, a lower stepped hole is provided at the center of the lower end of the extended bracket, and a plurality of packing layers are provided in the lower stepped hole.

[0009] As an optimal technical solution for the self-sealing packing structure of a molten salt valve of the utility model, the material of the packing layer is high-temperature vermiculite.

[0010] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, the material of the packing layer is mica.

[0011] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, an annular groove is provided on the upper end surface of the central hole of the valve body, and a sealing gasket is provided in the annular groove.

[0012] As an optimal technical solution for the self-sealing packing structure of a molten salt valve of the utility model, the sealing gasket is a toothed sealing gasket.

[0013] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, the elastic member is a disc spring or a spring.

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

[0015] The utility model arranges several layers of packing, and after the first layer of packing fails, the other layers of packing can still play a sealing role. An elastic member is added to the bottom of the stepped hole at the upper end of the valve body. The upper end of the elastic member applies upward pressure to the packing seat ring, and the packing seat ring transmits the pressure to the several layers of packing layers, thereby enhancing the sealing between the several layers of packing layers and the valve stem, which can effectively prevent molten salt leakage, ensure the long-term use effect of the packing, and greatly extend the service life of the molten salt valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the novel use.

[0017] In the figure: 1. Extended bracket; 2. Valve stem; 3. Valve body; 4. Bolt; 5. Elastic part; 6. Packing seat ring; 7. Packing layer; 8. Sealing gasket. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Reference Figure 1A self-sealing packing structure of a molten salt valve comprises an extended bracket 1, a valve stem 2 and a valve body 3, wherein a center hole is provided at the upper end of the valve body 3, the valve stem 2 is located in the center hole of the valve body 3, the extended bracket 1 is sleeved on the valve stem 2, the lower end of the extended bracket 1 is connected to the upper end of the valve body 3 through a bolt 4, an upper stepped hole is provided inside the upper end of the center hole, an elastic member 5 sleeved on the valve stem 2 is installed at the bottom of the upper stepped hole, a packing seat ring 6 sleeved on the valve stem 2 is provided at the upper end of the elastic member 5, and a plurality of packing layers 7 are provided at the upper end of the packing seat ring 6.

[0020] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, a lower stepped hole is provided at the center of the lower end of the elongated bracket 1, and a plurality of packing layers 7 are provided in the lower stepped hole.

[0021] As a preferred technical solution for the self-sealing packing structure of a molten salt valve of the utility model, the packing layer 7 is made of high-temperature vermiculite, which has strong high-temperature resistance and corrosion resistance and can avoid being damaged by high-temperature molten salt.

[0022] As a preferred technical solution for the self-sealing packing structure of a molten salt valve of the utility model, the packing layer 7 is made of mica, which has strong high temperature resistance and corrosion resistance, and can avoid being damaged by high temperature molten salt.

[0023] As an optimal technical solution for the self-sealing packing structure of a molten salt valve of the utility model, an annular groove is provided on the upper end surface of the central hole of the valve body 3, and a sealing gasket 8 is provided in the annular groove to increase the sealing between the valve body 3 and the lower end of the extended bracket 1.

[0024] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, the sealing gasket 8 is a toothed sealing gasket.

[0025] As a preferred technical solution of the self-sealing packing structure of a molten salt valve of the utility model, the elastic member 5 is a disc spring or a spring.

[0026] The utility model arranges several layers of packing, and after the first layer of packing fails, the other layers of packing can still play a sealing role. An elastic member is added to the bottom of the stepped hole at the upper end of the valve body. The upper end of the elastic member applies upward pressure to the packing seat ring, and the packing seat ring transmits the pressure to the several layers of packing layers, thereby enhancing the sealing between the several layers of packing layers and the valve stem, which can effectively prevent molten salt leakage, ensure the long-term use effect of the packing, and greatly extend the service life of the molten salt valve.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A self-sealing packing structure of a molten salt valve, comprising an extended bracket, a valve stem and a valve body, wherein the upper end of the valve body is provided with a center hole, the valve stem is located in the center hole of the valve body, the extended bracket is sleeved on the valve stem, and the lower end of the extended bracket is connected to the upper end of the valve body by bolts, characterized in that: An upper stepped hole is provided inside the upper end of the center hole, an elastic member sleeved on the valve stem is installed at the bottom of the upper stepped hole, a packing seat ring sleeved on the valve stem is provided at the upper end of the elastic member, and a plurality of packing layers are provided at the upper end of the packing seat ring.

2. A molten salt valve self-sealing packing structure according to claim 1, characterized in that: A lower stepped hole is arranged at the center of the lower end of the elongated bracket, and a plurality of filling layers are arranged in the lower stepped hole.

3. A molten salt valve self-sealing packing structure according to claim 2, characterized in that: The material of the filler layer is high-temperature vermiculite.

4. A molten salt valve self-sealing packing structure according to claim 2, characterized in that: The material of the filler layer is mica.

5. A molten salt valve self-sealing packing structure according to claim 1, characterized in that: An annular groove is arranged on the upper end surface of the central hole of the valve body, and a sealing gasket is arranged in the annular groove.

6. A molten salt valve self-sealing packing structure according to claim 5, characterized in that: The sealing gasket is a toothed sealing gasket.

7. A molten salt valve self-sealing packing structure according to claim 1, characterized in that: The elastic member is a disc spring or a spring.

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