High-temperature melt sealing emptying valve

Abstract

The high-temperature melt sealing discharging valve comprises a valve rod, a valve body, a valve element and a driving device used for driving the valve rod to act, a feeding port is formed in the bottom of the valve body, a discharging port is formed in the side portion of the valve body, a buffering assembly is arranged on the upper portion of the valve body, the valve rod penetrates through the buffering assembly and then stretches into the valve body, and a cavity is formed in the buffering assembly. The cavity is filled with protective gas, and a gap is reserved in the position, penetrating through the valve body, of the valve rod. A transition plate is arranged between the buffer assembly and the valve body, and a sealing piece is arranged at the joint of the transition plate and the buffer assembly. According to the valve, multi-stage sealing is achieved through valve body interior sealing, gas sealing in gaps, sealing piece sealing and buffering assembly sealing, high-temperature melt metal materials are effectively isolated from outside air, the purity of the materials is guaranteed, meanwhile, condensation after upwelling of the materials can be effectively avoided, and the working smoothness of the valve rod is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a high-temperature melt sealing discharge valve. Background Art

[0002] Some high-temperature melts (such as lithium) have active chemical properties and cannot come into direct contact with air or water vapor. Therefore, the equipment used to refine such metals has very high requirements for sealing. Usually, after the metal is refined, it needs to be connected to the subsequent ingot casting equipment. Currently, valves are used to control the flow of high-temperature melts into the ingot casting equipment.

[0003] However, conventional valves have poor air tightness after long-term use, which will cause the metal to react with the air and reduce the purity of the final ingot metal.

[0004] CN218408643U discloses a lead discharge valve for a lead melting pot. When discharging lead liquid, the valve stem and the spherical plunger are driven upward by rotating the valve handle, and the lead liquid can be discharged through the lead inlet hole, the horizontal straight channel, the spherical groove, the inner valve shell and the lead outlet hole in sequence, so as to achieve pouring. However, it does not consider the sealing problem of the connection between the valve stem and the inner valve shell. For metals with relatively active chemical properties, insufficient sealing here will cause the metal to react with air. Summary of the invention

[0005] In view of the above problems, the present invention provides a high-temperature melt sealing discharge valve, which can avoid the poor sealing problem caused by conventional valves and thus ensure the purity of the high-temperature melt material.

[0006] Specifically, the present invention is achieved by:

[0007] A high-temperature melt sealing discharge valve, comprising: a valve stem, a valve body, a valve core and a driving device for driving the valve stem to move, the valve body is provided with a feed inlet at the bottom, a discharge port at the side, and a buffer assembly at the top, the valve stem extends into the valve body after passing through the buffer assembly, a cavity is formed in the buffer assembly, the cavity is filled with protective gas, and a gap is left at the position where the valve stem passes through the valve body;

[0008] A transition plate is arranged between the buffer assembly and the valve body, and a sealing member is arranged at the connection between the transition plate and the buffer assembly.

[0009] Furthermore, the valve core comprises an upper valve core and a lower valve core, the upper valve core is located at the top of the valve body, and the lower valve core is located at the bottom of the valve body, and both the upper valve core and the lower valve core are provided with an arc surface;

[0010] A valve ball is provided at the bottom end of the valve stem. When the valve is opened, the valve ball fits against the arc surface of the upper valve core; when the valve is closed, the valve ball fits against the arc surface of the lower valve core.

[0011] Furthermore, the buffer assembly comprises:

[0012] Transition plate; arranged on the upper part of the valve body;

[0013] The buffer sleeve is arranged on the upper part of the transition plate, and the sealing member is arranged at the connection between the transition plate and the buffer sleeve, and is used to isolate the valve body from the buffer sleeve;

[0014] The bellows is connected to the valve stem and the buffer sleeve respectively, and is used to achieve sealing between the upper part of the valve stem and the buffer sleeve.

[0015] Furthermore, the bellows is arranged above the buffer sleeve, a first fixing block is arranged on the valve stem, and two ends of the bellows are respectively connected to the first fixing block and the buffer sleeve.

[0016] Furthermore, the bellows is arranged inside the buffer sleeve, a second fixing block is arranged on the valve stem, the second fixing block is located inside the buffer sleeve, and two ends of the bellows are respectively connected to the second fixing block and the top end of the buffer sleeve.

[0017] Working principle of the present invention:

[0018] The discharge port on the side of the valve body is connected to the downstream equipment through the discharge pipe, and the discharge pipe is filled with protective gas. In the initial state, when the valve stem is in a low position, the valve ball at its bottom fits with the arc surface of the lower valve core to block the feed port, and the protective gas in the discharge pipe fills the gap between the valve stem and the valve body (hereinafter referred to as the first gap). When the valve stem is quickly lifted up by the driving device, the valve ball fits with the arc surface of the upper valve core, and the gas in the first gap is also sealed by the valve ball. The feed port is instantly opened, and the molten metal surges up and flows out of the discharge pipe. When the molten metal surges up too fast, a small amount of molten metal will pass through the sealing surface of the upper valve core and the valve ball and enter the first gap. Since there is protective gas in the first gap, a small amount of molten metal enters the first gap and compresses the protective gas. Under the action of the protective gas pressure, the molten metal is prevented from reaching the seal from the first gap, thereby protecting the seal.

[0019] In addition, the cavity of the buffer component can be connected to the gap between the valve stem and the valve body, that is, a second gap is left between the valve stem, the seal and the transition plate. When the valve stem is in a low position, the upper cavity is connected to the discharge pipe through the second gap and the first gap, and the protective gas enters the upper cavity from the gap. When the valve stem is quickly lifted up under the action of the driving device, the valve stem drives the bellows to stretch, and the volume of the upper cavity increases, forming an instantaneous suction effect, and a part of the protective gas is drawn into the cavity and the gap. The valve ball fits the arc surface of the upper valve core. If a small amount of molten metal passes through the sealing surface of the upper valve core and the valve ball and enters the first gap, the upper protective gas will be compressed. Under the action of the protective gas pressure, the molten metal is prevented from reaching the seal from the first gap. When the valve stem descends to close the valve, the valve stem drives the bellows to contract, compress the cavity, and press out part of the protective gas. Under the action of the protective gas, a small amount of molten metal in the first gap will also be pressed out.

[0020] In addition, the protective gas in the buffer component cavity can effectively isolate the outside air and prevent the internal metal melt from being oxidized, thereby improving the purity of the metal.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The high-temperature melt-tight discharge valve provided by the present invention adopts a multi-stage sealing method, which can effectively isolate the air and ensure that the metal liquid inside does not contact the air, thereby ensuring the purity of the discharged material. At the same time, by controlling the up and down movement of the valve stem, the material can be accurately controlled to be on and off, and the flow is completely cut off without leakage, thereby ensuring the accuracy of the discharge amount.

[0023] (2) The structure of two upper and lower valve cores is adopted, which can not only seal the material in the lower feed pipe but also prevent the material from surging up and entering the buffer sleeve.

[0024] (3) A gap is left where the valve stem passes through the valve body, and the gap is filled with protective gas. When the valve stem is in a high position, if a small amount of molten metal enters the first gap, the protective gas can prevent the molten metal from further upwelling, thereby protecting the seal and preventing the material from condensing after upwelling, thereby ensuring the smooth operation of the valve stem. In addition, the protective gas in the upper buffer assembly can also isolate the outside air to ensure the purity of the metal.

[0025] (4) The upper buffer assembly adopts the form of a buffer sleeve + bellows, which not only ensures the accuracy of the up and down movement of the valve stem, but also effectively isolates the valve body from the outside.

[0026] (5) The valve stem is opened and closed by a drive device, and its rapid response can ensure the stability and accuracy of the amount of material released, thereby improving the uniformity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the high temperature melt sealing discharge valve in Example 1;

[0028] Figure 2 This is a schematic diagram of the opening action of the high-temperature melt sealing discharge valve in Example 1;

[0029] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0030] Figure 4 This is a schematic diagram of the closing action of the high-temperature melt sealing discharge valve in Example 1;

[0031] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0032] Figure 6 This is a schematic diagram of the opening action of the high-temperature melt sealing discharge valve in Example 2;

[0033] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0034] Figure 8 This is a schematic diagram of the closing action of the high-temperature melt sealing discharge valve in Example 2;

[0035] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle;

[0036] Fig.10 It is a schematic diagram of the high temperature melt sealing discharge valve in Example 3;

[0037] Fig.11 This is a schematic diagram of the opening action of the high-temperature melt sealing discharge valve in Example 3;

[0038] Fig.12 Schematic diagram of the closing action of the high-temperature melt sealing discharge valve in Example 3.

[0039] Reference numerals:

[0040] 1-driving device; 2-valve body; 21-upper valve core; 22-lower valve core; 3-valve stem; 31-valve ball; 32a-first fixed block; 32b-second fixed block; 41-transition plate; 42-buffer sleeve; 43-seal; 44-bellows. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0042] Example 1

[0043] like Figure 1-5 As shown, the present invention provides a high-temperature melt sealing discharge valve, including: a valve stem 3, a valve body 2, a valve core, a buffer assembly and a driving device 1 for driving the valve stem 3 to move. The bottom of the valve body 2 is a feed port, which is connected to the upstream equipment through a feed pipe, and the side is a discharge port, which is connected to the downstream equipment through a discharge pipe. A lower valve core 22 with a through hole in the middle is provided at the feed port, the upper end of the lower valve core 22 is bowl-shaped, and the bottom end of the valve stem 3 is a valve ball 31. The valve stem 3 extends to a low position, and the valve ball 31 fits with the arc surface of the lower valve core 22 to form a spherical sealing surface to seal the material coming from the feed pipe below. Similarly, the top of the valve body 2 is an upper valve core 21, and the bottom end of the upper valve core 21 is bowl-shaped. The valve ball 31 fits with the arc surface of the lower valve core 22 to form a spherical sealing surface to prevent the material from surging.

[0044] The buffer assembly is located on the upper part of the valve body 2, serving as a guide support for the valve stem 3 and isolating it from the outside. It includes: a transition plate 41, a buffer sleeve 42 and a bellows 44. The transition plate 41 is fixed on the top of the valve body 2, and the buffer sleeve 42 is located above the transition plate 41. The valve body 2 passes through the buffer sleeve 42 and the transition plate 41 from top to bottom and then extends into the interior of the valve body 2. A seal 43 made of flexible sealing material is provided at the connection between the buffer sleeve 42 and the transition plate 41 to isolate the valve body 2 from the buffer sleeve 42 to prevent materials from penetrating into the buffer sleeve 42. At the same time, the flexible seal 43 also plays a supporting role, that is, to ensure that the valve ball 31 of the valve stem 3 moves in the axial direction, and has a certain degree of flexible compatibility to ensure the cooperation between the valve ball 31 and the valve core.

[0045] When the molten metal rises too quickly, a small amount of the molten metal will penetrate upward from the spherical sealing surface. In order to prevent the molten metal from penetrating from the spherical sealing surface to the seal 43 and causing damage to the seal 43, a first gap is set between the valve stem 3 and the upper valve core 21. Since one end of the discharge pipe is usually filled with protective gas (argon), when the valve is closed, the first gap and the discharge pipe are actually in a connected state, and the protective gas in the discharge pipe will enter the first gap. When the valve stem 3 is quickly lifted up by the drive device 1, a part of the protective gas will remain in the first gap. When the molten metal rises and enters the first gap, the volume of the protective gas is compressed and its pressure increases, preventing the molten metal from continuing to rise to the seal 43, thereby protecting the seal 43 and preventing the molten metal from condensing after penetration, thereby ensuring the smooth operation of the valve stem 3.

[0046] The bellows 44 is arranged above the buffer sleeve 42, and a first fixed block 32a is provided on the upper part of the valve stem 3. The two ends of the bellows 44 are respectively welded to the first fixed block 32a and the upper block of the buffer sleeve 42. The bellows 44 is used to seal the middle through hole of the buffer sleeve 42, and the valve stem 3 below the first fixed block 32a is further sealed, thereby ensuring the sealing between the upper part of the valve stem 3 and the buffer sleeve 42. In this embodiment, a multi-stage sealing method is adopted (the valve ball 31 and the upper valve core 21 are the first-level seal, the gas in the first gap is the second-level seal, the seal 43 is the third-level seal, and the bellows 44 is the fourth-level seal), which can effectively isolate the material from the outside and avoid the contact and reaction of molten metal liquid with air.

[0047] Example 2

[0048] On the basis of Example 1, Figure 6-9 As shown, a smaller second gap is left between the seal 43 and the valve stem 3, and the second gap (0.02mm) is smaller than the first gap (0.2mm), so that the internal volume of the buffer sleeve 42 is connected to the first gap, and the protective gas is stored in the internal volume of the buffer sleeve 42. When the valve stem 3 is quickly lifted up by the driving device 1, the valve stem 1 drives the bellows 44 to stretch, and the volume of the buffer sleeve 42 cavity increases, forming an instantaneous suction effect, and a part of the protective gas is sucked into the cavity and the gap. The valve ball 31 fits the arc surface of the upper valve core 21. If a small amount of molten metal passes through the upper sealing surface and enters the first gap (the height of the molten metal penetrating into the first gap should be less than 50mm, leaving a certain space with the seal 43), the upper protective gas will be compressed, and under the action of the protective gas pressure in the cavity of the buffer sleeve 42, the molten metal is prevented from reaching the seal 43 from the first gap. When the valve stem 3 descends to close the valve, the valve stem 3 drives the bellows 44 to contract, compresses the cavity, and presses out part of the protective gas. Under the action of the protective gas, a small amount of molten metal in the first gap will also be pressed out to avoid stagnation of the molten metal.

[0049] Example 3

[0050] like Figure 10-12 As shown, in this embodiment, the bellows 44 is built-in, that is, the bellows 44 is arranged inside the buffer sleeve 42, and the second fixing block 32b is arranged at the part where the valve stem extends into the buffer sleeve 42, and the two ends of the bellows 44 are respectively welded to the second fixing block 32b and the top stopper of the buffer sleeve 42. This form can heat the entire valve, which is suitable for higher temperatures, and the structure is more compact, which is suitable for valves with high requirements for external dimensions.

[0051] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A high-temperature melt sealing discharge valve, comprising: A valve stem (3), a valve body (2), a valve core and a driving device (1) for driving the valve stem (3) to move, characterized in that: The valve body (2) is provided with a feed inlet at the bottom, a discharge port at the side, and a buffer assembly at the top. The valve stem (3) passes through the buffer assembly and then extends into the valve body (2). A cavity is formed in the buffer assembly. The cavity is filled with protective gas. A gap is left at the position where the valve stem (3) passes through the valve body (2); A transition plate (41) is arranged between the buffer assembly and the valve body (2), and a sealing member (43) is arranged at the connection between the transition plate (41) and the buffer assembly.

2. The high temperature melt sealing discharge valve according to claim 1, characterized in that: The valve core comprises an upper valve core (21) and a lower valve core (22), the upper valve core (21) is located at the top of the valve body (2), and the lower valve core (22) is located at the bottom of the valve body (2), and both the upper valve core (21) and the lower valve core (22) are provided with arc surfaces; A valve ball (31) is provided at the bottom end of the valve stem (3). When the valve is opened, the valve ball (31) fits against the arc surface of the upper valve core (21); when the valve is closed, the valve ball (31) fits against the arc surface of the lower valve core (22).

3. The high temperature melt sealing discharge valve according to claim 1, characterized in that: The buffer assembly comprises: The buffer sleeve (42) is arranged on the upper part of the transition plate (41), and the sealing member (43) is arranged at the connection between the transition plate (41) and the buffer sleeve (42) and is used to isolate the valve body (2) from the buffer sleeve (42); The bellows (44) is respectively connected to the valve stem (3) and the buffer sleeve (42) and is used to achieve sealing between the valve stem (3) and the buffer sleeve (42).

4. The high temperature melt sealing discharge valve according to claim 3, characterized in that: The bellows (44) is arranged above the buffer sleeve (42), a first fixing block (32a) is arranged on the valve stem (3), and two ends of the bellows (44) are respectively connected to the first fixing block (32a) and the buffer sleeve (42).

5. The high temperature melt sealing discharge valve according to claim 3, characterized in that: The bellows (44) is arranged inside the buffer sleeve (42), a second fixing block (32b) is arranged on the valve stem (3), the second fixing block (32b) is located inside the buffer sleeve (42), and two ends of the bellows (44) are respectively connected to the second fixing block (32b) and the top end of the buffer sleeve (42).

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