Air inlet structure of pressure sintering furnace

Abstract

The application relates to an air inlet structure of a pressure sintering furnace. A thermostat is arranged in a furnace body, and the thermostat is provided with a sintering space and a plurality of air charging holes. An air charging assembly comprises a diffusion plate and an air charging pipe. The diffusion plate is arranged between the furnace body and the thermostat and is connected to the thermostat. The diffusion plate is provided with diffusion cavities which are communicated with the plurality of air charging holes. One end of the air charging pipe is used for communicating with a gas supply source, and the other end of the air charging pipe is communicated with the diffusion cavities. A door body is used for opening and closing the sintering space. The door body is provided with a plurality of air inlet channels. The air inlet channels comprise air inlet cavities, air inlet grooves and air inlet ports. The air inlet cavities are communicated with the sintering space through the air inlet grooves and are communicated with external environments through the air inlet ports. A plurality of valve cores are arranged in the air inlet cavities in one-to-one correspondence. The valve cores can float downward in the air inlet cavities to close the air inlet ports or can float upward in the air inlet cavities to open the air inlet ports. When the air pressure in the sintering space is lower than the air pressure of the external environment, the air pressure of the external environment can enable the valve cores to float upward to open the air inlet ports against the action of gravity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure sintering furnace, in particular to an air inlet structure of pressure sintering furnace. BACKGROUND

[0002] The pressure sintering furnace is a device for sintering high-temperature and high-pressure sintering materials. The characteristics of high-temperature and high-pressure sintering materials are firstly sintered in a low-pressure state and finally sintered in a high-pressure state. After high-temperature and high-pressure sintering process, the mechanical properties of the material are better than those of ordinary sintering process.

[0003] In order to better shape the product, a shaping agent is usually added to the product. However, if the shaping agent stays in the product, it will affect the quality of the product, so dewaxing is needed, and dewaxing is needed whether in a low-pressure state or in a high-pressure state. However, the existing pressure sintering furnace has uneven air inlet, which leads to poor dewaxing effect, different product color and affects product quality. SUMMARY

[0004] The purpose of the present application is to provide a pressure sintering furnace which can realize uniform air inlet whether in a low-pressure state or in a high-pressure state, improve dewaxing effect and improve product quality.

[0005] To solve the above technical problems, the present application adopts the following technical scheme.

[0006] The present application provides an air inlet structure of pressure sintering furnace, which comprises: a furnace body; a constant temperature box arranged in the furnace body, the constant temperature box being provided with a sintering space and a plurality of air charging holes communicating with the sintering space; an air charging assembly comprising a diffusion plate and an air charging pipe, the diffusion plate being arranged between the furnace body and the constant temperature box and connected to the constant temperature box, the diffusion plate being provided with diffusion cavities, the diffusion cavities communicating with the air charging holes, the air charging pipe being arranged in the furnace body, one end of the air charging pipe being used for communicating with a gas source, the other end of the air charging pipe communicating with the diffusion cavities; a door body used for opening and closing the sintering space, the door body being provided with a plurality of air inlet channels, the air inlet channel comprising an air inlet cavity, an air inlet groove and an air inlet port, the air inlet cavity communicating with the sintering space through the air inlet groove and communicating with an external environment through the air inlet port; a plurality of valve cores arranged one by one in the air inlet cavities, the valve core being capable of floating downward in the air inlet cavity to close the air inlet port and cut off the communication of the air inlet channel, or floating upward in the air inlet cavity to open the air inlet port and make the air inlet channel communicate with the sintering space and the external environment; wherein when the air pressure in the sintering space is lower than the air pressure in the external environment, the air pressure in the external environment can make the valve core float upward to open the air inlet port against the action of gravity.

[0007] Some embodiments of the present application, the air inlet channel further comprises a gas distribution cavity; the air inlet cavity is communicated with a plurality of the air inlet grooves through the gas distribution cavity.

[0008] Some embodiments of the present application, the door body comprises a door body, a cover plate and a plurality of mounting seats; the door body is provided with the air inlet groove; the cover plate is provided with the gas distribution cavity; the mounting seat is provided with the air inlet cavity and the air inlet; the cover plate is mounted on the outside of the door body, and the gas distribution cavity is communicated with the air inlet groove; the mounting seat is mounted on the outside of the cover plate, and the air inlet cavity is communicated with the gas distribution cavity.

[0009] Some embodiments of the present application, the door body further comprises the mounting seat comprising a mounting seat body and a mounting block; the mounting seat body is provided with the air inlet cavity, and the air inlet cavity is a bottom opening structure; the mounting block is provided with the air inlet, and the mounting block is threadedly connected to the bottom of the air inlet cavity, and the air inlet is communicated with the air inlet cavity.

[0010] Some embodiments of the present application, the side wall of the mounting seat body is further provided with a communication port; the communication port communicates the air inlet cavity and the gas distribution cavity, and is close to the air inlet; when the valve core floats downward to close the air inlet, it can block one side of the communication port.

[0011] Some embodiments of the present application, the included angle of the first anti-skid groove and the second anti-skid groove at the first end point is 60 degrees; the included angle of the first anti-skid groove and the second anti-skid groove at the second end point is 120 degrees.

[0012] Some embodiments of the present application, a plurality of the air inlet grooves comprise a first air inlet groove and a second air inlet groove; the first air inlet groove extends horizontally, the first air inlet groove is provided with a plurality of rows, and is arranged in parallel and spaced apart in the vertical direction; the second air inlet groove extends vertically, and the second air inlet groove communicates a plurality of the first air inlet holes; the first air inlet groove and the second air inlet groove are both communicated with the gas distribution cavity.

[0013] Some embodiments of the present application, the valve core is provided with a weight reduction groove; the weight reduction groove is annular and is arranged in the middle of the vertical direction of the valve core.

[0014] Some embodiments of the present application, the air inlet channel is arranged in a rectangular array.

[0015] Some embodiments of the present application, the air inlet hole is arranged at the top of the constant temperature box; the diffusion plate is connected to the top of the constant temperature box; the air inlet pipe extends vertically and is arranged through the top of the furnace body.

[0016] Some embodiments of the present application, a plurality of the air inlet holes and the air inlet assembly are arranged in pairs in the axial direction of the constant temperature box.

[0017] From the above technical solutions, the embodiments of the present application have at least the following advantages and positive effects:

[0018] In the air inlet structure of the pressure sintering furnace, in the high pressure state, the inflation assembly is used for inflation, the inflation pipe fills the high pressure gas from the gas source into the diffusion cavity, and the diffusion is carried out in the diffusion cavity, the diffused high pressure gas can be introduced into the sintering space through the plurality of inflation holes, and then the high pressure gas is dispersed to realize the uniform air inlet in the high pressure state, which is beneficial to improving the dewaxing effect of the product in the high pressure state. In the low pressure state, the air inlet passage on the door body is used for air inlet, because the sintering space is in the low pressure state, the air pressure of the sintering space is lower than that of the external environment, the pressure difference is used, the air pressure of the external environment can make the valve core overcome the gravity to float upward to open the air inlet, the air inlet passage is communicated with the sintering space and the external environment, so that the gas in the external environment can enter the sintering space through the air inlet passage, because the door body is provided with a plurality of air inlet passages, the uniform air inlet in the low pressure state is also realized. Therefore, whether in the low pressure state or in the high pressure state, the uniform air inlet can be realized, the dewaxing effect is improved, and the product quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of the air inlet structure of the pressure sintering furnace of an embodiment of the present application.

[0020] Figure 2 is Figure 1 is a sectional view of the thermostat and the inflation assembly in

[0021] Figure 3 is Figure 2 is an enlarged structure schematic view of the A area in

[0022] Figure 4 is a front view of the door body of the pressure sintering furnace.

[0023] Figure 5 is Figure 4 is an enlarged structure schematic view of the B area in

[0024] Figure 6 is Figure 4 is a sectional view of

[0025] Figure 7 is Figure 6 is an enlarged structure schematic view of the C area in

[0026] The reference signs are explained as follows: 1, furnace body; 2, constant temperature box; 21, sintering space; 22, aeration hole; 3, aeration assembly; 31, diffusion plate; 311, diffusion cavity; 32, aeration pipe; 4, door body; 40, air inlet channel; 41, door body; 411, air inlet groove; 4111, first air inlet groove; 4112, second air inlet groove; 42, cover plate; 421, air diffusing cavity; 43, mounting seat; 431, mounting seat body; 4311, air inlet cavity; 4312, communication port; 432, mounting block; 4321, air inlet; 5, valve core. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0028] Referring to Figures 1 to 7 The air inlet structure of the pressure sintering furnace provided by an embodiment of the present application mainly comprises a furnace body 1, a constant temperature box 2, an aeration assembly 3, a door body 4, and a plurality of valve cores 5.

[0029] The constant temperature box 2 is arranged in the furnace body 1, and the constant temperature box 2 is provided with a sintering space 21 and a plurality of aeration holes 22 communicating with the sintering space 21.

[0030] The aeration assembly 3 comprises a diffusion plate 31 and an aeration pipe 32. The diffusion plate 31 is arranged between the furnace body 1 and the constant temperature box 2 and connected to the constant temperature box 2. The diffusion plate 31 is provided with diffusion cavities 311, and the diffusion cavities 311 communicate with the plurality of aeration holes 22. The aeration pipe 32 is arranged in the furnace body 1. One end of the aeration pipe 32 is used to communicate with a gas source, and the other end of the aeration pipe 32 communicates with the diffusion cavities 311.

[0031] The door body 4 is used to open and close the sintering space 21. The door body 4 is provided with a plurality of air inlet channels 40. The air inlet channel 40 comprises an air inlet cavity 4311, an air inlet groove 411, and an air inlet 4321. The air inlet cavity 4311 communicates with the sintering space 21 through the air inlet groove 411 and communicates with the external environment through the air inlet 4321.

[0032] The plurality of valve cores 5 are arranged in the air inlet cavity 4311 one by one. The valve core 5 can float downward in the air inlet cavity 4311 to close the air inlet 4321 and cut off the communication of the air inlet channel 40, or float upward in the air inlet cavity 4311 to open the air inlet 4321 and make the air inlet channel 40 communicate with the sintering space 21 and the external environment.

[0033] When the air pressure in the sintering space 21 is lower than the air pressure of the external environment, the air pressure of the external environment can make the valve core 5 float upward to open the air inlet 4321 against the action of gravity.

[0034] In the high-pressure state, the inflation assembly 3 is used for inflation, the inflation pipe 32 fills the high-pressure gas from the gas source into the diffusion chamber 311, and the diffusion is carried out in the diffusion chamber 311. The diffused high-pressure gas can be introduced into the sintering space 21 through the plurality of inflation holes 22, and then the high-pressure gas is dispersed to realize uniform inflation in the high-pressure state, which is beneficial to improving the dewaxing effect of the product in the high-pressure state. In the low-pressure state, the air inlet channel 40 on the door body 4 is used for air inlet. Since the sintering space 21 is in a low-pressure state, the air pressure of the sintering space 21 is lower than that of the external environment. By using the pressure difference, the air pressure of the external environment can make the valve core 5 float upward to open the air inlet 4321 against the action of gravity, so that the air inlet channel 40 connects the sintering space 21 and the external environment. Thus, the gas in the external environment can enter the sintering space 21 through the air inlet channel 40. Since the door body 4 is provided with a plurality of air inlet channels 40, uniform air inlet in the low-pressure state is also realized. Therefore, uniform air inlet can be realized in both the low-pressure state and the high-pressure state, the dewaxing effect is improved, and the product quality is improved.

[0035] It should be noted that the valve core 5 can float downward to close the air inlet 4321 under the action of its own gravity.

[0036] The door body 4 can be hinged to the furnace body 1, and the sintering space 21 is opened or closed by rotating the door body 4. The door body 4 is a separate structure, and the sintering space 21 is closed by covering the furnace body 1 with the door body 4, and the sintering space 21 is opened by detaching the door body 4.

[0037] Mainly refer to Figure 3 The inflation holes 22 are arranged at the top of the constant-temperature box 2. The diffusion plate 31 is connected to the top of the constant-temperature box 2. The inflation pipe 32 extends vertically and penetrates the top of the furnace body 1, that is, inflation from the top of the sintering space 21. The gas flows from top to bottom in the sintering space 21, which can better carry away the forming agent on the product, and is more conducive to improving the dewaxing quality. Moreover, since the bottom of the constant-temperature box 2 is arranged with a base and the like, the inflation pipe 32 is installed on the top of the furnace body 1, which can realize a more reasonable installation layout.

[0038] In this embodiment, a plurality of pairs of inflation holes 22 and inflation assemblies 3 are arranged along the axial direction of the constant-temperature box 2, so that the air inlet is more uniform. Moreover, the inflation amount is increased, which is more conducive to the rapid pressure increase of the pressure sintering furnace.

[0039] In this embodiment, the plurality of inflation holes 22 are arranged in a rectangular array, which more fully utilizes the space and can arrange more inflation holes 22.

[0040] In the present embodiment, the hole diameter of the inflation hole 22 is 3 mm.

[0041] It should be noted that the bottom of the furnace body 1 is also provided with an exhaust pipe, which communicates the sintering space 21 with the external environment, and is used to exhaust the gas in the sintering space 21.

[0042] Mainly refer to Figure 7 The air inlet channel 40 further comprises a gas diffusion chamber 421, and the air inlet chamber 4311 is communicated with a plurality of air inlet grooves 411 through the gas diffusion chamber 421, that is, each air inlet channel 40 corresponds to a plurality of air inlet grooves 411, so that the air inlet grooves 411 occupy a larger area of the door body 4, so that the gas can be dispersed to more positions, and the air inlet is more uniform. The gas entering the gas diffusion chamber 421 from the air inlet chamber 4311 can diffuse in the gas diffusion chamber 421 and enter the sintering space 21 through the plurality of air inlet grooves 411.

[0043] Mainly refer to Figure 6 and Figure 7 The door body 4 comprises a door body 41, a cover plate 42 and a plurality of mounting seats 43. The body is provided with an air inlet groove 411. The cover plate 42 is provided with a gas diffusion chamber 421. The mounting seat 43 is provided with an air inlet chamber 4311 and an air inlet 4321. The cover plate 42 is installed on the outside of the body, and the gas diffusion chamber 421 is communicated with the air inlet groove 411. The mounting seat 43 is installed on the outside of the cover plate 42, and the air inlet chamber 4311 is communicated with the gas diffusion chamber 421. Compared with the structure that the air inlet channel 40 is integrally provided on the door body 41, the different parts of the air inlet channel 40 are respectively provided on the door body 41, the cover plate 42 and the plurality of mounting seats 43, which is more convenient for processing and manufacturing. After the door body 41, the cover plate 42 and the plurality of mounting seats 43 are assembled, a plurality of air inlet channels 40 are formed. When the air inlet channel 40 is blocked, the door body 41, the cover plate 42 and the plurality of mounting seats 43 are disassembled to facilitate dredging.

[0044] The door body 4 further comprises a mounting seat 43 comprising a mounting seat body 431 and a mounting block 432. The mounting seat body 431 is provided with an air inlet chamber 4311, and the air inlet chamber 4311 is a bottom opening structure. The valve core 5 is installed into the air inlet chamber 4311 through the opening at the bottom of the air inlet chamber 4311. The mounting block 432 is provided with an air inlet 4321, and the mounting block 432 is threadedly connected to the bottom of the air inlet chamber 4311 and makes the air inlet 4321 communicated with the air inlet chamber 4311. The mounting block 432 is supported below the valve core 5.

[0045] In the present embodiment, the valve core 5 and the side wall of the mounting seat body 431 adopt a clearance fit, and the side wall of the mounting seat body 431 can guide the up-and-down floating of the valve core 5.

[0046] Please refer to Figure 7The side wall of the mounting base body 431 is further provided with a communication port 4312. The communication port 4312 communicates the air inlet cavity 4311 and the air distribution cavity 421, and is close to the air inlet port 4321. When the communication port 4312 is blocked, the mounting base body 431 can be disassembled to dredge the communication port 4312. When the valve core 5 is closed by floating downward, it can block the side of the communication port 4312, so that the valve core 5 is not lifted upward when the sintering space 21 is in a high pressure state.

[0047] Please refer to Figure 5 The plurality of air inlet grooves 411 include a first air inlet groove 4111 and a second air inlet groove 4112. The first air inlet groove 4111 extends in the transverse direction, and a plurality of rows of the first air inlet groove 4111 are arranged in parallel and spaced apart in the vertical direction. The second air inlet groove 4112 extends in the vertical direction, and the second air inlet groove 4112 communicates with a plurality of first air inlet holes. The first air inlet groove 4111 and the second air inlet groove 4112 both communicate with the air distribution cavity 421. The first air inlet groove 4111 and the second air inlet groove 4112 are arranged on the door body 41 to occupy a larger area, which is more conducive to uniform air intake.

[0048] Please refer to Figure 7 The valve core 5 is provided with a weight reduction groove for adjusting the weight of the valve core 5, so that the valve core 5 can float upward under the action of the pressure difference. The weight reduction groove is annular and is arranged in the middle of the valve core 5 in the vertical direction. The cross section of the valve core 5 in the vertical direction is in the shape of an I-beam. That is, the middle part of the valve core 5 is a reduced diameter section, and the outer diameters of the upper end and the lower end of the valve core 5 are larger, which can form a guide fit with the side wall of the mounting base body 431, and is conducive to the stable upward and downward floating of the valve core 5.

[0049] In the embodiment, the valve core 5 is made of graphite, which has the characteristics of high temperature resistance and is not easy to age, effectively prolonging the service life of the valve core 5.

[0050] Please refer to Figure 4 The air inlet channels 40 are arranged in a rectangular array, which more effectively utilizes the space on the door body 41, arranges more air inlet channels 40, and ensures more uniform air intake.

[0051] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0052] In the description of the application embodiments, it needs to be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application embodiments.

[0053] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application embodiments. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above is only the preferred embodiment of the application embodiments, and is not intended to limit the application embodiments. For those skilled in the art, the application embodiments can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. A gas inlet structure of a pressure sintering furnace, characterized by comprising: The application relates to a sintering furnace, which comprises a furnace body, a thermostat box arranged in the furnace body, the thermostat box being provided with a sintering space and a plurality of air charging holes connected with the sintering space, an air charging assembly comprising a diffusion plate and an air charging pipe, the diffusion plate being arranged between the furnace body and the thermostat box and connected with the thermostat box, the diffusion plate being provided with diffusion cavities, the diffusion cavities being connected with the air charging holes, the air charging pipe being arranged on the furnace body, one end of the air charging pipe being connected with a gas supply source, the other end of the air charging pipe being connected with the diffusion cavities, a door body for opening and closing the sintering space, the door body being provided with a plurality of air inlet channels, the air inlet channels comprising air inlet cavities, air inlet grooves and air inlet ports, the air inlet cavities being connected with the sintering space through the air inlet grooves and connected with the external environment through the air inlet ports, a plurality of valve cores arranged in the air inlet cavities one by one, the valve cores being capable of floating downward in the air inlet cavities to close the air inlet ports and cut off the air inlet channels, or floating upward in the air inlet cavities to open the air inlet ports and connect the air inlet channels with the sintering space and the external environment, wherein when the air pressure in the sintering space is lower than the air pressure in the external environment, the air pressure in the external environment can make the valve cores float upward to open the air inlet ports against the action of gravity. The air inlet channels further comprise air distribution cavities. The air inlet cavities are connected with the air inlet grooves through the air distribution cavities. The door body comprises a door body, a cover plate and a plurality of mounting seats. The door body is provided with the air inlet grooves. The cover plate is provided with the air distribution cavities. The mounting seats are provided with the air inlet cavities and the air inlet ports. The cover plate is mounted on the outer side of the door body and connects the air distribution cavities with the air inlet grooves. The mounting seats are mounted on the outer side of the cover plate and connect the air inlet cavities with the air distribution cavities. The mounting seats comprise mounting seat bodies and mounting blocks. The mounting seat bodies are provided with the air inlet cavities, and the air inlet cavities are of bottom opening structure. The mounting blocks are provided with the air inlet ports, the mounting blocks are threadedly connected with the bottoms of the air inlet cavities and connect the air inlet ports with the air inlet cavities. The side walls of the mounting seat bodies are further provided with connecting ports. The connecting ports connect the air inlet cavities with the air distribution cavities and are close to the air inlet ports. When the valve cores float downward to close the air inlet ports, the valve cores can block the side of the connecting ports. The valve cores are provided with weight reduction grooves. The weight reduction grooves are annular and arranged in the middle parts of the valve cores in the vertical direction. The air inlet grooves comprise first air inlet grooves and second air inlet grooves. The first air inlet grooves extend in the horizontal direction, the first air inlet grooves are arranged in multiple rows and in parallel and spaced apart in the vertical direction. The second air inlet grooves extend in the vertical direction and connect a plurality of first air inlet grooves. The first air inlet grooves and the second air inlet grooves are connected with the air distribution cavities. The air inlet channels are arranged in a rectangular array. The air charging holes are arranged on the top of the thermostat box.

2. The gas inlet structure of a pressure sintering furnace according to claim 1, wherein The diffusion plate is connected with the top of the thermostat box. The air charging pipe extends in the vertical direction and is arranged on the top of the furnace body. A plurality of the air charging holes and the air charging assembly are arranged in multiple pairs in the axial direction of the thermostat box. ​ 3. The gas inlet structure of a pressure sintering furnace according to claim 1, wherein ​ 4. The gas inlet structure of a pressure sintering furnace according to claim 1, wherein ​ ​ ​ 5. The gas inlet structure of a pressure sintering furnace according to claim 1, wherein ​

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