CN217034620U - Knob protection device for crystal furnace observation window - Google Patents
Knob protection device for crystal furnace observation window Download PDFInfo
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- CN217034620U CN217034620U CN202220430241.XU CN202220430241U CN217034620U CN 217034620 U CN217034620 U CN 217034620U CN 202220430241 U CN202220430241 U CN 202220430241U CN 217034620 U CN217034620 U CN 217034620U
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Abstract
The utility model discloses a knob protector of a crystal furnace observation window, which is arranged on a rotary screw rod in a crystal furnace hearth and positioned between a rotary baffle fixed at the end part of the rotary screw rod and a furnace wall of the crystal furnace, and comprises: the cover body, the inner sleeve, the outer sleeve and the flaky limiting nut; the cover body is sleeved on the rotary screw rod through a through hole arranged on the cover body, the inner sleeve is arranged on the rotary screw rod through a threaded hole arranged on the inner sleeve, and the end part of the inner sleeve is pressed on the cover body; the outer sleeve is sleeved outside the inner sleeve, the bottom wall of the outer sleeve is embedded with the outer wall of the inner sleeve through a mounting hole formed in the bottom wall of the outer sleeve, and the turning edge of the cover body is buckled on the outer wall of the outer sleeve, wherein a gap is formed between the outer sleeve and the inner sleeve; the limiting nut is arranged on the rotary screw and used for positioning the outer sleeve and enabling the cover body to be pressed on the furnace wall of the crystal furnace; the inner sleeve, the outer sleeve and the limit nut synchronously rotate along with the rotating screw rod. The knob protection device prolongs the service life of the rotary screw and the knob sealing device, and ensures the vacuum stability of the crystal furnace hearth.
Description
Technical Field
The utility model relates to a knob protection device arranged at an observation window in a crystal furnace hearth.
Background
The crystal growth technology is an important technology in the field of material science, and the growth state of the crystal needs to be observed constantly in order to obtain a high-quality artificial crystal. Therefore, most of the conventional crystal furnaces are provided with observation windows, the observation windows are usually switched on and off by knobs, the knobs need to be frequently used, and the following use requirements are provided for the parts forming the knobs: in order to ensure that the knob has higher switching times, the rotating screw rod has enough mechanical strength; in order to realize the continuous sealing of the furnace body in the opening and closing processes of the knob and guarantee the service life of the sealing ring, the contact part of the surface of the screw rod and the sealing ring is smooth enough; the knob is also resistant to high temperature, and under the high-temperature condition, the knob does not generate pollutants polluting the hearth environment. Therefore, most of the rotary screws use metal (e.g., high-quality carbon steel) screws, and a baffle for blocking the observation window is fixed to the lower end of the screw in the hearth.
Referring to fig. 1, which is a schematic cross-sectional view of a conventional crystal furnace and a knob, the knob has a relatively simple structure, in the figure, a is a screw, b is a sealing ring of a sealing device, c is the crystal furnace, d is a heater, f is a baffle, g is a knob handle, h is an observation window, and the baffle f is adjusted to shield and open the observation window h. The part of the screw rod a positioned in the hearth does not have any protective measures, and the vacuum sealing device is equivalently in direct contact with a hearth thermal field and the internal atmosphere. Therefore, the structure of the existing knob mainly has the following two disadvantages: 1. when a high-melting-point crystal grows, heat directly radiated to the surface of the screw rod a is directly conducted to the mechanical transmission structure and the sealing ring b through the screw rod a, so that the sealing ring b is aged, the service life of the sealing ring b is shortened, and the vacuum stability is reduced. If the air leakage phenomenon occurs when the crystal grows at high temperature, the knob and the crystal furnace are greatly damaged, and meanwhile, the screw a is easy to deform at high temperature, so that the screw a is difficult to disassemble and assemble during later maintenance; 2. when strong corrosive gas exists in the hearth (for example, HF gas exists in the hearth for growing calcium fluoride crystals), the crystal furnace c is easily corroded, impurities are easily deposited and adsorbed on the inner surface of the hearth, the hearth environment is polluted when the impurities fall, and the screw rod a and the sealing ring c are easily corroded.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide a knob protection device for an observation window of a crystal furnace, which reduces the influence of high temperature on the mechanical property and the sealing property of a knob and reduces the influence of corrosive gas in a hearth on a sealing ring.
In order to realize the purpose, the technical scheme of the utility model is as follows:
a knob guard for a crystal furnace viewing window mounted to a rotating screw in a furnace of a crystal furnace between a rotating baffle fixed to an end of the rotating screw and a furnace wall of the crystal furnace, comprising: the cover body, the inner sleeve, the outer sleeve and the flaky limit nut;
the cover body is sleeved on the rotary screw rod through a through hole arranged on the cover body, the inner sleeve is installed on the rotary screw rod through a threaded hole arranged on the inner sleeve, and the end part of the inner sleeve is pressed on the cover body;
the outer sleeve is sleeved outside the inner sleeve, the bottom wall of the outer sleeve is embedded with the outer wall of the inner sleeve through a mounting hole formed in the bottom wall of the outer sleeve, the turning edge of the cover body is buckled on the outer wall of the outer sleeve, and a gap is formed between the outer sleeve and the inner sleeve; the limiting nut is arranged on the rotary screw and used for positioning the outer sleeve and pressing the cover body to the furnace wall of the crystal furnace;
the inner sleeve, the outer sleeve and the limiting nut rotate synchronously along with the rotating screw rod.
Further, the cover body, the inner sleeve, the outer sleeve and the limiting nut are all made of graphite materials.
Further, the knob protector further comprises a graphite slip sheet, and the graphite slip sheet is installed between the outer sleeve port and the cover body.
Further, the outer contour of the cross section of the inner sleeve is rectangular; at the embedded part of the mounting hole of the inner sleeve and the outer sleeve, the wall of the outer wall of the inner sleeve and the wall of the mounting hole are both rough surfaces.
Furthermore, a positioning structure matched with the furnace wall is arranged at the contact position of the cover body and the furnace wall of the crystal furnace.
When the crystal furnace provided with the knob protection device is used for crystal negative pressure growth, heat radiated by a thermal field in a hearth reaches the surface of the outer sleeve, and the surface of the outer sleeve can reflect a part of heat radiation; the vacuum gap between the inner sleeve and the outer sleeve plays a role in heat insulation, so that most of heat outside the outer sleeve is difficult to be conducted to the inner sleeve, the inner sleeve further isolates the heat, the rotating screw is greatly protected, and the heat on the rotating screw is prevented from being conducted to the knob sealing device outside the furnace wall; the knob protection device can also prevent the rotary screw and the knob sealing device from directly contacting corrosive gas. In a word, the installation of this knob protector has increased the life of rotatory screw rod and knob sealing device, provides the guarantee for the vacuum stability of crystal stove furnace.
Drawings
FIG. 1 is a schematic view of a knob structure of a crystal furnace observation window in the background art;
FIG. 2 is a schematic view of the knob guard installation location provided by the present example;
FIG. 3 is a schematic cross-sectional view of the knob guard provided in this example;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
in the figure:
1-crystal furnace; 2-rotating the screw; 3, rotating the baffle; 4-knob guard; 4-1-cover body; 4-2-inner sleeve; 4-3-coat; 4-limit nut; 4-5-graphite slip sheet; 5-sealing ring.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is described clearly and completely below with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, and not all examples. All other embodiments obtained by a person skilled in the art based on examples in the present invention shall fall within the scope of protection of the present invention without making creative efforts.
Referring to fig. 2 to 4, the present embodiment provides a knob guard for a crystal growing furnace observation window according to the present invention, which is mounted on a rotary screw 2 in a furnace chamber of a crystal growing furnace 1, between a rotary baffle 3 fixed to an end of the rotary screw 1 and a furnace wall of the crystal growing furnace 1, the knob guard 4 comprising: the cover comprises a cover body 4-1, an inner sleeve 4-2, an outer sleeve 4-3 and a flaky limiting nut 4-4;
the cover body 4-1 is sleeved on the rotary screw rod 2 through a through hole arranged on the cover body, the inner sleeve 4-2 is arranged on the rotary screw rod 2 through a threaded hole arranged on the inner sleeve, and the end part of the inner sleeve 4-2 is pressed on the cover body 4-1;
the outer sleeve 4-3 is sleeved outside the inner sleeve 4-2, the bottom wall of the outer sleeve 4-3 is embedded with the outer wall of the inner sleeve 4-2 through a mounting hole arranged on the bottom wall, the turning edge of the cover body 4-1 is buckled on the outer wall of the outer sleeve 4-3, and a gap is formed between the outer sleeve 4-3 and the inner sleeve 4-2; the limiting nut 4-4 is arranged on the rotary screw rod 2 and is used for positioning the outer sleeve 4-2 and pressing the cover body 4-1 to the furnace wall of the crystal furnace 1;
the inner sleeve 4-2, the outer sleeve 4-3 and the limit screw cap 4-4 synchronously rotate along with the rotating screw rod 2.
When the crystal furnace 1 provided with the knob protection device 4 of the example is used for growing crystals under negative pressure, heat radiated by a thermal field in a hearth firstly reaches the surface of the outer sleeve 4-3, and the surface of the outer sleeve 4-3 can reflect part of heat radiation; the vacuum gap between the inner sleeve 4-2 and the outer sleeve 4-3 plays a role of heat insulation, so that most of heat outside the outer sleeve 4-3 is difficult to be conducted to the inner sleeve 4-2, the inner sleeve 4-2 further isolates heat, the rotary screw 2 is greatly protected, and the heat on the rotary screw 2 is prevented from being conducted to the knob sealing device outside the furnace wall; the knob guard 4 also prevents the rotary screw 2 and the knob seal from coming into direct contact with corrosive gases. In the knob sealing device, the sealing ring 5 is a core component for ensuring that the crystal furnace 1 is in a vacuum state, the installation of the knob protection device 4 prolongs the service life of the rotary screw rod 2 and the knob sealing device, especially prolongs the service life of the sealing ring in the knob sealing device, and provides guarantee for the vacuum stability of the hearth of the crystal furnace 1. The knob guard 4 of this example is simple to disassemble, assemble and maintain, and is practical, low cost, and any component is damaged and this part is changed can.
When a fluoride crystal grows in the crystal furnace, the temperature of the hearth of the crystal furnace is relatively high, and high corrosive gases such as HF exist, and the like, in the example of calcium fluoride crystal growth, the cover body 4-1, the inner sleeve 4-2, the outer sleeve 4-3 and the limit nut 4-4 are made of graphite. Because the graphite is high temperature resistant and corrosion resistant, the mechanical strength is higher, and the environment of most hearths is not polluted.
Preferably, the knob guard 4 of the present example further includes a graphite slide 4-5, the graphite slide 4-5 being mounted between the end of the outer sleeve 4-3 and the cover 4-1.
The sliding sheet 4-5 is arranged at the port of the outer sleeve 4-3, so that the inner sleeve 4-2, the outer sleeve 4-3 and the cover body 4-1 form a hollow structure, the heat transferred to the rotating screw rod 2 is further reduced, the heat transferred to the sealing device by the rotating screw rod, particularly the heat transferred to the sealing ring 5, is reduced, meanwhile, corrosive gas in the hearth is difficult to reach the sealing ring 5, the service life of the sealing ring 5 is prolonged, and the sealing stability of the crystal furnace 1 is improved. In addition, the knob guard 4 also prevents the rotary screw 2 from being thermally deformed and corrosive gas from corroding the rotary screw 2
Referring to fig. 3-4, the cross section of the inner sleeve 4-2 has a rectangular outer contour; at the embedded part of the mounting hole at the bottom wall of the inner sleeve 4-2 and the outer sleeve 4-3, the outer wall of the inner sleeve 4-2 and the wall of the mounting hole are rough surfaces, so that the inner sleeve 4-2 made of graphite is more closely matched with the outer sleeve 4-3, and the hollow heat-insulating property between the inner sleeve 4-2 and the outer sleeve 4-3 is ensured.
In order to facilitate the installation of the cover body 4-1 in the knob protector 4 of the present example, a positioning structure matched with the furnace wall of the crystal furnace 1 is arranged at the contact position of the cover body 4-1 and the furnace wall. Specifically, an installation groove matched with the outer contour of the cover body 4-1 can be formed in the furnace wall, so that the cover body 4-1 and the whole device can be conveniently installed and positioned.
The installation steps of the knob guard of the present example may be:
the cover body 4-1 is sleeved into the rotary screw rod 2 until the cover body 4-1 is installed in an installation groove arranged on the furnace wall, and the upper surface of the cover body 4-1 is in contact with the furnace wall.
The inner sleeve 4-2 is screwed on the rotary screw rod 2, the inner sleeve 4-2 is in threaded connection with the rotary screw rod 2, the screwing is not to be too tight, otherwise, excessive pressure is applied to the cover body 4-1, and the knob protection device has problems when expanding at high temperature.
Placing a graphite slip sheet 4-5 on the port of the outer sleeve 4-3, aligning the graphite slip sheet 4-5 with the cover body 4-1, then sleeving the outer sleeve 4-3 upwards outside the inner sleeve 4-2, referring to figure 3, the cross section of the inner sleeve 4-2 is rectangular, the outer wall of the inner sleeve 4-2 is in rough surface contact with the wall of the mounting hole of the outer sleeve 4-3, and then mounting two limit screw caps 4-4 below the bottom wall of the outer sleeve 4-3 for fixing the outer sleeve 4-3 and tightly buckling the outer sleeve 4-3 with the cover body 4-1.
After the knob guard of this example is installed, the rotation bezel 3 is installed.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle and spirit of the utility model, and such modifications and improvements are also considered to be within the scope of the utility model.
Claims (5)
1. A knob guard for a crystal furnace viewing window mounted to a rotating screw in a furnace chamber of a crystal furnace between a rotating baffle fixed to an end of the rotating screw and a furnace wall of the crystal furnace, comprising: the cover body, the inner sleeve, the outer sleeve and the flaky limit nut;
the cover body is sleeved on the rotary screw rod through a through hole arranged on the cover body, the inner sleeve is installed on the rotary screw rod through a threaded hole arranged on the inner sleeve, and the end part of the inner sleeve is pressed on the cover body;
the outer sleeve is sleeved outside the inner sleeve, the bottom wall of the outer sleeve is embedded with the outer wall of the inner sleeve through a mounting hole formed in the bottom wall of the outer sleeve, the turning edge of the cover body is buckled on the outer wall of the outer sleeve, and a gap is formed between the outer sleeve and the inner sleeve; the limiting nut is arranged on the rotary screw rod and used for positioning the outer sleeve and enabling the cover body to be pressed on the furnace wall of the crystal furnace;
the inner sleeve, the outer sleeve and the limiting nut rotate synchronously along with the rotating screw rod.
2. The knob guard according to claim 1, wherein said cover, said inner sleeve, said outer sleeve and said limit nut are all graphite.
3. The knob guard according to claim 2, further comprising a graphite slide mounted between the housing port and the cover.
4. The knob guard according to claim 2 or 3, wherein the inner sleeve has a rectangular outer profile in cross-section; at the embedded part of the mounting hole of the inner sleeve and the outer sleeve, the wall of the outer wall of the inner sleeve and the wall of the mounting hole are both rough surfaces.
5. The knob guard according to claim 1, wherein a positioning structure is provided at a contact position of the cover body and the crystal furnace wall, and the positioning structure is matched with the furnace wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220430241.XU CN217034620U (en) | 2022-03-02 | 2022-03-02 | Knob protection device for crystal furnace observation window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220430241.XU CN217034620U (en) | 2022-03-02 | 2022-03-02 | Knob protection device for crystal furnace observation window |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217034620U true CN217034620U (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220430241.XU Active CN217034620U (en) | 2022-03-02 | 2022-03-02 | Knob protection device for crystal furnace observation window |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217034620U (en) |
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2022
- 2022-03-02 CN CN202220430241.XU patent/CN217034620U/en active Active
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