Graphite heater for directional growth of gem

Abstract

The utility model discloses a graphite heater for directional growth of gemstone, which is characterized in that middle grooves with the same size are additionally arranged between an upper groove and a lower groove in the circumferential direction of a graphite heater body, the middle grooves are positioned at the lower part of the body, and the resistance at the lower part of the body can be increased by arranging the middle grooves; meanwhile, due to the fact that the middle groove is formed in the lower portion of the body, the heating area of the lower portion of the body is smaller than the heating area of the upper portion of the body, a certain temperature difference exists between the heat of the lower portion of the body and the heat of the upper portion of the body, and the temperature below the body is low. And the liquid forms turbulent flow in the crucible, and the flow speed is slowed down to reduce the loss of heat at the lower part of the crucible, so that heat compensation is performed on a heat loss area at the bottom of the crucible, the temperature difference between the upper end and the lower end of the crucible is reduced, and the whole temperature field environment is kept stable.

Description

Technical Field

[0001] This utility model belongs to the field of gemstone processing technology, specifically relating to a graphite heater for directional growth of gemstones. Background Technology

[0002] Cylindrical graphite heaters are widely used in Czochralski (CZ) gemstone cultivation. During the CZ growth process, a crucible is placed inside the graphite heater, and the bottom heating seat electrically heats the heater to melt the raw material. However, the bottom of the crucible has a support, resulting in heat loss at the bottom and temperature variations within the crucible. When these variations exceed a certain degree, they not only affect gemstone cultivation but also significantly impact the macroscopic and microscopic structure of the product. Therefore, structural improvements to the heater are necessary. By adjusting the resistance of the graphite heater body, the localized heat generation can be regulated, causing varying flow rates of the molten material within the crucible and creating turbulence in certain areas. This slower flow rate locks in heat, compensating for heat loss in the bottom area of ​​the crucible and preventing excessive temperature variations. This creates a stable temperature gradient throughout the entire environment, ensuring the quality of gemstone processing. Utility Model Content

[0003] The purpose of this invention is to provide a graphite heater for directional growth of gemstones. By adding a uniformly sized intermediate groove between the upper and lower grooves on the circumference of the graphite heater body, the intermediate groove is located at the lower part of the body. The intermediate groove increases the resistance of the lower part of the body. Under constant voltage, the current passing through the lower part of the body decreases. When the body reaches thermal equilibrium, the heat in the lower part is less than that in the upper part. At the same time, because of the intermediate groove in the lower part of the body, the heating area in the lower part is smaller than that in the upper part, creating a certain temperature difference between the lower and upper parts of the body. The lower temperature of the lower part of the body reduces the flow rate of the liquid in the crucible. The liquid forms turbulence in the crucible, and the slower flow rate reduces the heat loss in the lower part of the crucible, thereby compensating for the heat loss area at the bottom of the crucible, reducing the temperature difference between the upper and lower parts of the crucible, and keeping the entire temperature field environment stable.

[0004] This utility model is achieved through the following technical solution:

[0005] A graphite heater for directional growth of gemstones includes a body, which is a cylindrical structure. The body has a positive electrode and a negative electrode, which are arranged opposite to each other. The bottom of the body has a plurality of spaced-apart lower grooves facing the top, and the top of the body has a plurality of spaced-apart upper grooves facing the bottom, with the upper grooves spaced apart from the lower grooves. An intermediate groove is provided between adjacent upper and lower grooves.

[0006] Preferably, the distance between the middle groove and the upper and lower grooves on its left and right sides is the same.

[0007] Preferably, the bottom end of the intermediate groove and the bottom end of the upper groove are on the same horizontal plane.

[0008] Preferably, the height of the top of the intermediate groove is less than the height of the top of the lower groove.

[0009] Preferably, the positive electrode portion and the negative electrode portion have the same structure and are both arc-shaped plate structures, and the middle part of the positive electrode portion and the negative electrode portion are connected to the body.

[0010] Preferably, the middle part of the positive electrode is connected between adjacent lower slots on the body; the negative electrode is located on the opposite side of the positive electrode and is also connected between adjacent lower slots on the body.

[0011] Preferably, the left and right sides of the positive or negative electrode portion are spaced apart from the main body.

[0012] Preferably, the upper groove, lower groove and middle groove have the same width, which is 3mm-5mm.

[0013] Preferably, the thickness of the body is 8mm-10mm.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] In this invention, a uniformly sized intermediate groove is added between the upper and lower grooves on the circumference of the graphite heater body. The intermediate groove is located at the lower part of the body. The opening of the intermediate groove increases the resistance of the lower part of the body. Under constant voltage, the current passing through the lower part of the body decreases. When the body reaches thermal equilibrium, the heat in the lower part is less than the heat in the upper part. At the same time, because of the intermediate groove at the lower part of the body, the heating area at the lower part is smaller than the heating area at the upper part, creating a certain temperature difference between the lower and upper parts of the body. The lower temperature of the lower part of the body reduces the flow rate of the liquid in the crucible. The liquid forms turbulence in the crucible, and the slower flow rate reduces the heat loss in the lower part of the crucible. This compensates for the heat loss in the bottom heat loss area of ​​the crucible, reduces the temperature difference between the upper and lower parts of the crucible, and keeps the entire temperature field environment stable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the overall structure of the graphite heater in this utility model.

[0018] Figure 2 This is a bottom view of the graphite heater in this utility model.

[0019] Wherein: 1-body, 11-upper groove, 12-lower groove, 13-middle groove, 14-positive electrode part, 15-negative electrode part. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] Example 1:

[0022] A graphite heater for directional growth of gemstones, such as Figure 1 and Figure 2As shown, the device includes a body 1, which is a cylindrical structure made of graphite material with a thickness of 8mm. A positive electrode 14 and a negative electrode 15 are disposed on the body 1, facing each other. The positive electrode 14 and negative electrode 15 support the body 1 and are connected to a heating device. Several spaced-apart lower grooves 12 are formed at the bottom of the body 1, with the length of each groove less than the height of the body 1. Several spaced-apart upper grooves 11 are formed at the top of the body 1, with the length of each groove less than the height of the body 1. The upper grooves 11 and lower grooves 12 are spaced apart, with a distance of 3cm between them. The upper grooves 11, lower grooves 12, and intermediate grooves 13 are parallel to each other and have the same width of 3mm. An intermediate groove 13 is provided between adjacent upper grooves 11 and lower grooves 12. The straight-line distance from the intermediate groove 13 to the upper groove 11 is... The straight-line distance from the middle tank 13 to the lower tank 12 is the same; the bottom end of the middle tank 13 is at the same horizontal plane as the bottom end of the upper tank 11, and the height of the top end of the middle tank 13 is less than the height of the top end of the lower tank 12; the middle tank 13 is located at the lower part of the body 1. The middle tank 13 can increase the resistance of the lower part of the body 1. Under constant voltage, the current passing through the lower part of the body 1 decreases. When the body 1 finally reaches thermal equilibrium, the heat in the lower part is less than the heat in the upper part. At the same time, due to the middle tank 13 at the lower part of the body 1, the heating area at the lower part is smaller than the heating area at the upper part, so that there is a certain temperature difference between the lower and upper parts of the body 1. The temperature at the bottom of the body 1 is low, which can reduce the flow rate of the liquid in the lower part of the crucible, so that the liquid forms turbulence in the crucible. The slower flow rate reduces the heat loss in the lower part of the crucible, thereby compensating for the heat loss area at the bottom of the crucible, reducing the temperature difference between the upper and lower parts of the crucible, keeping the entire temperature field environment stable, and thus ensuring product quality.

[0023] Example 2:

[0024] This embodiment, based on the above embodiment, further defines the positive electrode portion 14 and the negative electrode portion 15. The positive electrode portion 14 and the negative electrode portion 15 have the same structure and are both arc-shaped plate structures. The positive electrode portion 14 and the negative electrode portion 15 are plugged into and connected to the external heating device. The plate-shaped positive electrode portion 14 and the negative electrode portion 15 can provide a large support area, keeping the body 1 stable. The middle part of the positive electrode portion 14 and the negative electrode portion 15 are connected to the body 1. The middle part of the positive electrode portion 14 is connected between adjacent lower slots 12 on the body 1, and the negative electrode portion 15 is located on the opposite side of the positive electrode portion 14 and is also connected between adjacent lower slots 12 on the body 1. The positive electrode portion 14 and the negative electrode portion 15 are symmetrically arranged on the body 1 to ensure uniform axial heat distribution. In addition, the left and right sides of the positive electrode portion 14 or the negative electrode portion 15 are spaced apart from the body 1 to reduce unnecessary power consumption and also to reduce the weight of the body 1. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated here.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A graphite heater for directional growth of gemstones, characterized in that, The device includes a main body, which is a cylindrical structure. The main body has a positive electrode portion and a negative electrode portion, which are arranged opposite to each other on the main body. The bottom of the main body has several spaced-apart lower grooves facing the top, and the top of the main body has several spaced-apart upper grooves facing the bottom. The upper grooves are spaced apart from the lower grooves. An intermediate groove is provided between adjacent upper and lower grooves.

2. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The distance between the middle groove and the upper and lower grooves on its left and right sides is the same.

3. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The bottom end of the intermediate groove is at the same horizontal plane as the bottom end of the upper groove.

4. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The height of the top of the middle groove is less than the height of the top of the lower groove.

5. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The positive electrode and negative electrode sections have the same structure and are both arc-shaped plate structures. The middle part of the positive electrode and negative electrode sections is connected to the main body.

6. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The positive electrode portion is connected in the middle to the adjacent lower slots on the main body; the negative electrode portion is located on the opposite side of the positive electrode portion and is also connected to the adjacent lower slots on the main body.

7. The graphite heater for directional growth of gemstones as described in claim 5, characterized in that, The positive or negative electrode portion is spaced apart from the main body on its left and right sides.

8. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The upper groove, lower groove, and middle groove all have the same width, which is 3mm-5mm.

9. The graphite heater for directional growth of gemstones as described in claim 1, characterized in that, The thickness of the body is 8mm-10mm.

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