Electromagnetic valve for polycrystalline silicon ingot furnace

Abstract

The invention relates to the technical field of pilot electromagnetic valves, in particular to an electromagnetic valve for a polycrystalline silicon ingot furnace. A movable iron core assembly is installed in the valve body installation piece and used for sealing the pilot hole. A one-way driving piece is mounted on the valve body mounting piece; an expansion adaptive part is mounted in the valve body mounting part; the one-way driving part is used for extruding and expanding the adaptive part in a one-way manner; the one-way driving piece is adopted to automatically control the five expansion sliding blocks to expand outwards in a one-way mode, the five rows of resistance reduction balls are utilized to be attached to and limit a guide groove in the movable iron valve element in real time, and it can be kept that abrasion is automatically compensated after the movable iron valve element is abraded in a long-term lifting mode; the electromagnetic valve solves the problem that an existing electromagnetic valve for the polycrystalline silicon ingot furnace is inconvenient to expand and compensate a wear gap after a movable iron valve element ascends and descends at high frequency.

Description

Technical Field

[0001] This invention relates to the field of pilot solenoid valve technology, specifically to a solenoid valve for a polycrystalline silicon ingot casting furnace. Background Technology

[0002] Polycrystalline silicon ingot furnaces need to control the on / off of pipelines under high vacuum conditions, which places stringent requirements on the sealing reliability and response efficiency of valves. Pilot-operated solenoid valves are key components for this scenario. A low-power solenoid coil drives the pilot valve core to change the pressure difference in the main valve chamber, and then the pressure difference is used to drive the main valve core to move, thereby realizing the on / off of large-diameter pipelines. The control accuracy of the pilot valve directly affects the reliability of the main valve's switching. Current solenoid valves used in polycrystalline silicon ingot furnaces are electromagnetically controlled, which are highly responsive. However, with frequent switching, the moving iron valve core gradually wears down, resulting in play in the valve core. This affects the seal between the rubber block at the end of the moving iron valve core and the pilot hole, making it difficult to automatically compensate for the wear gap of the moving iron valve core. Furthermore, the traditional fully enclosed structure makes it difficult for workers to observe the wear. At the same time, it is not convenient to automatically clean the pilot hole, as silicon powder, pipe impurities, and other particulate matter easily adhere to the pilot hole, affecting its airflow. Summary of the Invention

[0003] The purpose of this invention is to provide a solenoid valve for polycrystalline silicon ingot furnaces, so as to solve the problem that current solenoid valves for polycrystalline silicon ingot furnaces are not convenient to expand and compensate for the wear gap after the moving iron valve core rises and falls at high frequency.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a solenoid valve for a polycrystalline silicon ingot casting furnace, comprising a valve body mounting component; a moving iron core assembly is installed inside the valve body mounting component, the moving iron core assembly being used to seal the pilot hole; a one-way drive component is installed on the valve body mounting component; an expansion adapter is installed inside the valve body mounting component; the one-way drive component is used to one-way compress the expansion adapter; the expansion adapter is located inside the moving iron core assembly; a visible sealing component is installed on the valve body mounting component; the valve body mounting component includes: a coil box and an electromagnetic coil, the coil box being provided with a power connection terminal; an electromagnetic coil is fixedly installed inside the coil box, and the power connection terminal on the coil box is electrically connected to the electromagnetic coil; a through hole is provided in the middle of the coil box.

[0005] Preferably, the valve body mounting component further includes: an iron core tube and a spring retaining ring, wherein the iron core tube is fixedly sleeved on the coil box; the bottom of the iron core tube is threaded; the top of the iron core tube is fixedly installed with a spring retaining ring, and the outer side of the spring retaining ring is threaded; the iron core tube and the electromagnetic coil are coaxial.

[0006] Preferably, the moving iron core assembly includes: a moving iron valve core and guide grooves, wherein the moving iron valve core is provided with a Teflon coating on its outer side; the moving iron valve core is slidably sleeved inside the iron core tube; the electromagnetic coil is used to magnetically attract the moving iron valve core; and five guide grooves are provided on the inner side of the moving iron valve core, and all five guide grooves are arc-shaped grooves.

[0007] Preferably, the moving iron core assembly further includes: a fixed plate, a vulcanized rubber block, a core column, and a sponge ball. The fixed plate is threadedly connected to the bottom of the moving iron valve core. A vulcanized rubber block is fixedly installed at the bottom of the fixed plate. A core column is fixedly installed on the fixed plate, and the core column passes through the vulcanized rubber block. The diameter of the core column is smaller than the diameter of the pilot hole. A sponge ball is fixedly installed at the end of the core column, and the sponge ball is used to clean the pilot hole.

[0008] Preferably, the unidirectional drive component includes: a drive screw, a rotary column, a conical slider, and a guide strip. The drive screw is rotatably sleeved inside the iron core tube. A rotary column is fixedly installed on the top of the drive screw, and the rotary column is rotatably sleeved on the top of the iron core tube. The rotary column is provided with scale lines. The conical slider is threadedly connected to the drive screw. The outer side of the conical slider has an inclined structure. A guide strip is fixedly installed on the side of the conical slider.

[0009] Preferably, the unidirectional drive component further includes: a drive spring, one end of which is fixedly mounted on the rotating column; the other end of which is fixedly mounted inside the spring retaining ring; the drive spring is used to drive the rotating column to rotate in one direction.

[0010] Preferably, the expansion adapter includes: an expansion fixing cylinder and expansion sliders, wherein the expansion fixing cylinder is threadedly connected to the inner side of the iron core tube; five expansion sliders are slidably inserted into the expansion fixing cylinder; the guide strip is slidably installed in the guide groove inside the expansion fixing cylinder; the expansion fixing cylinder and the conical slider are coaxial; the inner sides of the five expansion sliders are respectively inclined structures, and the inner sides of the five expansion sliders are respectively attached to the outer side of the conical slider.

[0011] Preferably, the expansion adapter further includes: drag-reducing balls and a return spring. Each of the five expansion sliders is embedded with a row of drag-reducing balls, and the five rows of drag-reducing balls roll and fit into the five guide grooves respectively. A return spring is fixedly installed at the bottom of the expansion fixing cylinder, and the bottom end of the return spring is fixedly installed inside the moving iron valve core. The return spring is located inside the moving iron valve core.

[0012] Preferably, the visible closure includes: a closure cover, which is threadedly connected to the spring retaining ring; the end of the closure cover is sealed and fitted to the iron core tube; the closure cover has scale lines, and the scale lines on the closure cover correspond to the scale lines on the rotating column; the closure cover is a transparent structure.

[0013] Preferably, the visible closure further includes: a pressure ring, which is fixedly installed at the bottom of the closure cover; the bottom of the pressure ring is attached to the rotating column; and the drive spring is located inside the closure cover.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a valve body mounting component that allows for rapid control of the movement of the moving iron core assembly. The pilot hole is opened and closed via a vulcanized rubber block. The sponge ball facilitates the lifting and wiping of the pilot hole during each opening and closing operation, assisting in cleaning and ensuring airflow through the pilot hole, thus preventing the small-diameter pilot hole from being easily blocked by impurities.

[0015] The unidirectional drive mechanism automatically controls the five expansion sliders to expand outward in one direction. Five rows of drag-reducing ball bearings ensure real-time contact with the guide groove within the moving iron valve core, allowing the valve core to automatically compensate for wear after long-term lifting and lowering, maintaining its vertical position and zero-gap state. Simultaneously, the compact structure does not affect the lifting and closing speed of the moving iron valve core. It is particularly suitable for polycrystalline silicon ingot furnaces requiring frequent pressure adjustments. Combined with the self-locking nature of the drive screw thread, it maintains the stability of the five expansion sliders' expansion and adaptation to the moving iron valve core. The visible sealing component allows operators to easily observe the rotating column, directly reflecting the wear condition of the guide groove on the moving iron valve core. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an electromagnetic valve for a polycrystalline silicon ingot furnace according to the present invention; Figure 2 This is a cross-sectional view of the internal structure of an electromagnetic valve for a polycrystalline silicon ingot furnace according to the present invention. Figure 3 This is a schematic diagram of the valve body mounting component of the present invention; Figure 4 This is a schematic diagram of the moving iron core assembly structure of the present invention; Figure 5 This is a schematic diagram of the moving iron core assembly structure of the present invention; Figure 6 This is a cross-sectional view of the expansion adapter structure of the present invention; Figure 7 This is a schematic diagram of the unidirectional drive component structure of the present invention; Figure 8 This is a schematic diagram of the expansion adapter structure of the present invention; Figure 9 This is a schematic diagram of the visible enclosure structure of the present invention; Figure 10 For the present invention Figure 2 Enlarged view of the structure of region B in the middle.

[0017] In the attached diagram, the components represented by each number are as follows: 1. Valve body mounting components; 101. Coil box; 1011. Electromagnetic coil; 102. Iron core tube; 1021. Spring retaining ring; 2. Moving iron core assembly; 201. Moving iron valve core; 202. Guide groove; 203. Fixing plate; 204. Vulcanized rubber block; 205. Core column; 206. Sponge ball; 3. One-way drive component; 301. Drive screw; 3011. Rotary column; 302. Conical slider; 3021. Guide bar; 303. Drive spring; 4. Expansion adapter; 401. Expansion fixing cylinder; 402. Expansion slider; 4021. Drag-reducing ball; 403. Return spring; 5. Visible sealing component; 501. Sealing cover; 502. Pressure ring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution: such as Figures 1 to 10 The solenoid valve for a polycrystalline silicon ingot casting furnace shown includes a valve body mounting component 1; a moving iron core assembly 2 is installed inside the valve body mounting component 1, which is used to close the pilot hole; a one-way drive component 3 is installed on the valve body mounting component 1; an expansion adapter 4 is installed inside the valve body mounting component 1; the one-way drive component 3 is used to unidirectionally compress the expansion adapter 4; the expansion adapter 4 is located inside the moving iron core assembly 2; a visible sealing component 5 is installed on the valve body mounting component 1; the valve body mounting component 1 includes a coil box 101 and an electromagnetic coil 1011, the coil box 101 is provided with a power connection terminal; the electromagnetic coil 1011 is fixedly installed inside the coil box 101, and the power connection terminal on the coil box 101 is electrically connected to the electromagnetic coil 1011; a through hole is provided in the middle of the coil box 101.

[0020] The valve body mounting component 1 further includes: an iron core tube 102 and a spring retaining ring 1021. The iron core tube 102 is fixedly sleeved on the coil box 101. The bottom of the iron core tube 102 is threaded. The spring retaining ring 1021 is fixedly installed on the top of the iron core tube 102, and the outer side of the spring retaining ring 1021 is threaded. The iron core tube 102 and the electromagnetic coil 1011 are coaxial. The moving iron core assembly 2 includes: a moving iron valve core 201 and a guide groove 202. The outer side of the moving iron valve core 201 is coated with Teflon. The moving iron valve core 201 is slidably sleeved inside the iron core tube 102. The electromagnetic coil 1011 is used to magnetically attract the moving iron valve core 201. 1. The moving iron valve core 201 has five guide grooves 202 on its inner side, and all five guide grooves 202 are arc-shaped grooves; the moving iron core assembly 2 also includes: a fixed plate 203, a vulcanized rubber block 204, a core column 205, and a sponge ball 206. The fixed plate 203 is threaded to the bottom of the moving iron valve core 201; the vulcanized rubber block 204 is fixedly installed at the bottom of the fixed plate 203; the core column 205 is fixedly installed on the fixed plate 203, and the core column 205 passes through the vulcanized rubber block 204; the diameter of the core column 205 is smaller than the diameter of the pilot hole; a sponge ball 206 is fixedly installed at the end of the core column 205, and the sponge ball 206 is used for cleaning. The pilot orifice is cleaned by using valve body mounting component 1, which allows for quick control of the movement of the moving iron core assembly 2. The opening and closing of the pilot orifice is controlled by a vulcanized rubber block 204. The Teflon coating on the outer side of the moving iron valve core 201 enhances its corrosion resistance. A fixed disc 203 threaded onto the moving iron valve core 201 facilitates the removal and replacement of the vulcanized rubber block 204. Simultaneously, a sponge ball 206 allows for easy wiping of the pilot orifice during each opening and closing operation, aiding in cleaning and ensuring airflow through the pilot orifice. This prevents the small-diameter pilot orifice from being easily clogged by impurities. The structure is simple to control, ensuring the normal operation of the main valve. Opening and closing: When the main valve needs to be opened, the control solenoid coil 1011 is energized, and the magnetically attracted moving iron valve core 201 moves upward. Because the diameter of the pilot hole is small, the required magnetic attraction force is within the controllable range of the solenoid coil 1011. When the moving iron valve core 201 moves upward and causes the vulcanized rubber block 204 to no longer seal the pilot hole, the upper chamber of the main valve is connected to the polycrystalline silicon ingot furnace, and the pressure in the upper chamber of the main valve drops sharply. Under the action of pressure difference, the main valve core will open at this time. This principle is consistent with the existing pilot valve control method. When the vulcanized rubber block 204 is adjusted up and down, it also drives the core column 205 and the sponge ball 206 to move together to wipe and clean the pilot hole.

[0021] The unidirectional drive component 3 includes: a drive screw 301, a rotary column 3011, a conical slider 302, and a guide bar 3021. The drive screw 301 is rotatably sleeved inside the iron core tube 102. The rotary column 3011 is fixedly installed on the top of the drive screw 301, and the rotary column 3011 is rotatably sleeved on the top of the iron core tube 102. The rotary column 3011 has scale lines. The conical slider 302 is threadedly connected to the drive screw 301. The outer side of the conical slider 302 has a beveled structure. The guide bar 3021 is fixedly installed on the side of the conical slider 302. The unidirectional drive component 3 also includes: a drive spring 303, the end of which is fixedly installed on the rotary column 3011. 3. The other end is fixedly installed inside the spring retaining ring 1021; the driving spring 303 is used to drive the rotating column 3011 to rotate in one direction; the expansion adapter 4 includes: an expansion fixing cylinder 401 and an expansion slider 402, the expansion fixing cylinder 401 is threadedly connected to the inside of the iron core tube 102; five expansion sliders 402 are slidably inserted into the expansion fixing cylinder 401; the guide strip 3021 is slidably installed in the guide groove inside the expansion fixing cylinder 401; the expansion fixing cylinder 401 and the conical slider 302 are coaxial; the inner sides of the five expansion sliders 402 are respectively inclined structures, and the inner sides of the five expansion sliders 402 are respectively attached to the outer side of the conical slider 302; the expansion adapter 4 also includes: a drag-reducing ball bearing 4021. Along with the return spring 403, each of the five expansion sliders 402 is embedded with a row of drag-reducing balls 4021, and the five rows of drag-reducing balls 4021 roll and fit into the five guide grooves 202 respectively; the bottom of the expansion fixing cylinder 401 is fixedly installed with the return spring 403, and the bottom end of the return spring 403 is fixedly installed inside the moving iron valve core 201; the return spring 403 is located inside the moving iron valve core 201; the one-way drive component 3 can automatically control the five expansion sliders 402 to expand outward in one direction, and the five rows of drag-reducing balls 4021 can maintain real-time contact with the guide grooves 202 in the limit moving iron valve core 201, so that the moving iron valve core 201 can automatically compensate for wear after long-term lifting and lowering wear, and can still maintain The vertical alignment and zero-gap condition prevent the moving iron valve core 201 from shaking due to play, which would affect the sealing performance of the vulcanized rubber block 204 to the pilot hole, effectively improving the service life of the structure. The structure is simple to control and is more suitable for polycrystalline silicon ingot furnaces that require frequent pressure adjustment. At the same time, the drive spring 303 drives the drive screw 301 to rotate, which can maintain real-time drive. In addition, the self-locking property of the drive screw 301 thread can maintain the stability of the expansion sliders 402 in adapting to the moving iron valve core 201. The unidirectional expansion of the five expansion sliders 402 can continuously adapt to wear, and the friction-reducing ball bearings 4021 can reduce wear by fitting with the guide groove 202.

[0022] The visible sealing component 5 includes: a sealing cover 501, which is threaded onto the mainspring retaining ring 1021; the end of the sealing cover 501 is sealed against the iron core tube 102; the sealing cover 501 has scale lines, and the scale lines on the sealing cover 501 correspond to the scale lines on the rotating column 3011; the sealing cover 501 is transparent; the visible sealing component 5 also includes: a pressure ring 502, which is fixedly installed at the bottom of the sealing cover 501; the bottom of the pressure ring 502 is attached to the rotating column 3011; and a drive mainspring. 303 is located inside the closed cover 501. The use of a visible sealing element 5 allows staff to easily observe the rotating column 3011. Together with the scale lines on the rotating column 3011 and the closed cover 501, staff can visually observe the rotation of the rotating column 3011, that is, the degree to which the drive screw 301 rotates and drives the conical slider 302 to move downward. This directly reflects the wear condition of the guide groove 202 on the moving iron valve core 201, which is convenient for staff to record. The structure is simple and facilitates timely replacement when the moving iron valve core 201 is excessively worn.

[0023] Working principle: First, the threaded connection at the bottom of the iron core tube 102 is installed to the pilot valve threaded hole of the main valve. When the main valve needs to be closed, the control solenoid coil 1011 is de-energized. Under the pressure of the return spring 403, the moving iron valve core 201 moves downward, causing the vulcanized rubber block 204 to seal the pilot hole. At this time, under the negative pressure in the furnace, the vulcanized rubber block 204 will tightly fit and seal the pilot hole. When the pilot hole of the main valve is closed, the normal pressure in the upper chamber of the main valve cannot be released. Combined with the thrust of the spring used for reset of the main valve, the main valve core is pushed. When closed, the main valve is in the closed state to ensure the sealing of the vacuum pipeline. When the main valve needs to be opened, the control solenoid coil 1011 is energized, and the magnetically attracted moving iron valve core 201 moves upward. Because the diameter of the pilot hole is small, the required magnetic attraction force is within the controllable range of the solenoid coil 1011. When the moving iron valve core 201 moves upward and causes the vulcanized rubber block 204 to no longer seal the pilot hole, the upper chamber of the main valve is connected to the polycrystalline silicon ingot furnace, and the pressure in the upper chamber of the main valve drops sharply. Under the action of pressure difference, the main valve core will open at this time. Its control principle is the same as that of the existing pilot valve. When the vulcanized rubber block 204 is raised and lowered, it also moves the core column 205 and the sponge ball 206 together. The sponge ball 206 itself is breathable, and when the moving iron valve core 201 moves upward, the sponge ball 206 separates from the pilot hole. When the moving iron valve core 201 moves downward, it will drive the sponge ball 206 to insert into the pilot hole for wiping and cleaning. As the guide groove 202 wears down due to the long-term raising and lowering of the moving iron valve core 201, the elastic force of the drive spring 303 drives the rotary column 3011 to rotate, which in turn drives the drive screw 301 to rotate. The conical slider 302 is driven to move downward. The conical slider 302 is slidably installed in the expansion fixing cylinder 401 through the guide bar 3021. When the conical slider 302 moves downward, the inclined structure of the conical slider 302 will squeeze the five expansion sliders 402 to expand outward, which will drive the five rows of drag-reducing balls 4021 to keep in real time fit with the guide groove 202 in the limit moving iron valve core 201, and adapt to the wear gap in real time. At the same time, the elasticity of the driving spring 303 can control the driving screw 301 to keep rotating in one direction, ensuring the stability of the moving iron valve core 201. During regular inspections, staff should observe and record any misalignment of the scale lines on the rotary column 3011 and the sealing cover 501. Since the wear rate of the moving iron valve core 201 is gradual, the rotary column 3011 will rotate slowly as it wears down. When the rotation angle of the rotary column 3011 reaches the preset threshold, the moving iron valve core 201 should be replaced promptly.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solenoid valve for a polycrystalline silicon ingot casting furnace, comprising a valve body mounting component (1); wherein a moving iron core assembly (2) is installed inside the valve body mounting component (1), characterized in that: The moving iron core assembly (2) is used to seal the pilot hole; a one-way drive component (3) is installed on the valve body mounting component (1); An expansion adapter (4) is installed inside the valve body mounting component (1); the one-way drive component (3) is used to unidirectionally compress the expansion adapter (4); the expansion adapter (4) is located inside the moving iron core assembly (2); a visible closure component (5) is installed on the valve body mounting component (1). The valve body mounting component (1) includes: a coil box (101) and an electromagnetic coil (1011). The coil box (101) is provided with a power terminal. The electromagnetic coil (1011) is fixedly installed inside the coil box (101), and the power terminal on the coil box (101) is electrically connected to the electromagnetic coil (1011). The coil box (101) is provided with a through hole in the middle.

2. The solenoid valve for a polycrystalline silicon ingot furnace according to claim 1, characterized in that: The valve body mounting component (1) further includes: an iron core tube (102) and a spring retaining ring (1021), wherein the iron core tube (102) is fixedly sleeved on the coil box (101); the bottom of the iron core tube (102) is provided with threads; the top of the iron core tube (102) is fixedly installed with a spring retaining ring (1021), and the outer side of the spring retaining ring (1021) is provided with threads; the iron core tube (102) and the electromagnetic coil (1011) are coaxial.

3. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 2, characterized in that: The moving iron core assembly (2) includes: a moving iron valve core (201) and a guide groove (202). The moving iron valve core (201) is slidably sleeved inside the iron core tube (102). The electromagnetic coil (1011) is used to magnetically attract the moving iron valve core (201). The moving iron valve core (201) has a guide groove (202) on its inner side, and all five guide grooves (202) are arc-shaped grooves.

4. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 3, characterized in that: The moving iron core assembly (2) further includes: a fixed plate (203), a vulcanized rubber block (204), a core column (205), and a sponge ball (206). The fixed plate (203) is threaded to the bottom of the moving iron valve core (201). The vulcanized rubber block (204) is fixedly installed at the bottom of the fixed plate (203). The core column (205) is fixedly installed on the fixed plate (203), and the core column (205) passes through the vulcanized rubber block (204). The diameter of the core column (205) is smaller than the diameter of the pilot hole. The end of the core column (205) is fixedly installed with a sponge ball (206), and the sponge ball (206) is used to clean the pilot hole.

5. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 3, characterized in that: The unidirectional drive component (3) includes: a drive screw (301), a rotary column (3011), a conical slider (302), and a guide bar (3021). The drive screw (301) is rotatably sleeved inside the iron core tube (102). The rotary column (3011) is fixedly installed on the top of the drive screw (301), and the rotary column (3011) is rotatably sleeved on the top of the iron core tube (102). The rotary column (3011) is provided with scale lines. The conical slider (302) is threadedly connected to the drive screw (301). The outer side of the conical slider (302) is a slope structure. The guide bar (3021) is fixedly installed on the side of the conical slider (302).

6. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 5, characterized in that: The unidirectional drive component (3) further includes: a drive spring (303), one end of which is fixedly mounted on the rotating column (3011); the other end of which is fixedly mounted on the inner side of the spring retaining ring (1021); the drive spring (303) is used to drive the rotating column (3011) to rotate in one direction.

7. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 5, characterized in that: The expansion adapter (4) includes: an expansion fixing cylinder (401) and an expansion slider (402). The expansion fixing cylinder (401) is threadedly connected to the inner side of the iron core tube (102). At least one expansion slider (402) is slidably inserted into the expansion fixing cylinder (401). The guide strip (3021) is slidably installed in the guide groove inside the expansion fixing cylinder (401). The expansion fixing cylinder (401) and the conical slider (302) are coaxial. The inner sides of the five expansion sliders (402) are all inclined structures, and the inner sides of the five expansion sliders (402) are respectively attached to the outer side of the conical slider (302).

8. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 7, characterized in that: The expansion adapter (4) also includes: drag-reducing balls (4021) and a return spring (403). Each of the five expansion sliders (402) is embedded with a row of drag-reducing balls (4021), and the five rows of drag-reducing balls (4021) roll and fit into the five guide grooves (202). The bottom of the expansion fixing cylinder (401) is fixedly installed with a return spring (403), and the bottom end of the return spring (403) is fixedly installed inside the moving iron valve core (201). The return spring (403) is located inside the moving iron valve core (201).

9. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 6, characterized in that: The visible closure (5) includes: a closure cover (501), which is threaded onto the spring retaining ring (1021); the end of the closure cover (501) is sealed to fit the iron core tube (102); the closure cover (501) is provided with scale lines, and the scale lines on the closure cover (501) correspond to the scale lines on the rotating column (3011); the closure cover (501) is a transparent structure.

10. The solenoid valve for a polycrystalline silicon ingot casting furnace according to claim 9, characterized in that: The visible closure (5) further includes: a pressure ring (502), which is fixedly installed at the bottom of the closure cover (501); the bottom of the pressure ring (502) is attached to the rotating column (3011); and the drive spring (303) is located inside the closure cover (501).

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