Vacuum heat treatment furnace electrode

Abstract

The utility model discloses a vacuum heat treatment furnace electrode, belongs to the technical field of sintering equipment, and aims to solve the problem of how to improve the mounting convenience of a cooling piece. The vacuum heat treatment furnace electrode comprises an electrode main body, a cooling piece and a sleeve, a connecting hole is formed in one end of the electrode body, and an exhaust hole is formed in the bottom of the connecting hole and penetrates out of the electrode body. One end of the cooling piece is arranged in the connecting hole, a reserved cavity is formed between the cooling piece and the bottom of the connecting hole, a cooling channel for conveying cooling liquid is arranged in the cooling piece, and the two ends of the cooling channel are connected with a cooling liquid inlet and a cooling liquid outlet respectively; the sleeve sleeves the cooling piece and the electrode main body, and an exhaust channel is formed between the inner wall of the sleeve and the outer wall of the electrode main body and is communicated with the outside of the sleeve and the exhaust hole. According to the vacuum heat treatment furnace electrode, by arranging the exhaust channel formed by the exhaust hole and the sleeve, the air resistance phenomenon is avoided, the installation convenience can be improved, and the fatigue life of the end of the electrode body is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sintering equipment, in particular to a vacuum heat treatment furnace electrode. BACKGROUND

[0002] In the application of vacuum heat treatment furnace, the design of electrode often contains a cooling assembly integrated at one end of the electrode main body, which is internally structured with a cooling channel, aiming to effectively transfer and dissipate the heat generated in the work of the electrode through the circulating water or special cooling liquid, and then enhance the high temperature resistance of the electrode. The cooling assembly is generally made of metal material with excellent heat conductivity, and its design has one end tightly fitted into the reserved hole at the end of the electrode main body. This assembly emphasizes the close contact between the cooling assembly and the inner wall of the hole to ensure efficient heat conduction. However, this design also has the following problems:

[0003] Firstly, the cooling assembly will expand under continuous high temperature operation, and then exert pressure on the inner wall of the reserved hole, which may cause stress concentration and fatigue damage at the end of the electrode main body, significantly shortening the overall service life of the electrode. Secondly, from the perspective of installation convenience, the installation process of the cooling assembly requires pushing its end into the reserved hole, which needs to exclude air in the hole, and there is air resistance phenomenon, which is not convenient to install.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0005] (I) Technical problem to be solved

[0006] The embodiment of the present application provides a vacuum heat treatment furnace electrode, which can solve the problem of how to improve the installation convenience of the cooling part in the prior art.

[0007] (II) Technical scheme

[0008] To solve the above technical problems, the present application provides the following technical scheme:

[0009] A vacuum heat treatment furnace electrode is provided, which comprises an electrode main body, a cooling part and a sleeve.

[0010] One end of the electrode main body is provided with a connecting hole, and the bottom of the connecting hole is provided with an exhaust hole, which penetrates to the outside of the electrode main body.

[0011] The cooling member is arranged in the connecting hole and forms a reserved cavity with the bottom of the connecting hole, and the cooling member is internally provided with a cooling channel for conveying cooling liquid, and the two ends of the cooling channel are respectively connected with a cooling liquid inlet and a cooling liquid outlet.

[0012] The sleeve is sleeved outside the part of the cooling member and the electrode body, and an exhaust passage is formed between the inner wall of the sleeve and the outer wall of the electrode body, and the exhaust passage is in communication with the outside of the sleeve and the exhaust hole.

[0013] In some embodiments, the vacuum heat treatment furnace electrode further comprises a flange and a first sealing ring, the flange is fixedly sleeved outside the cooling member and is provided with a first annular groove on the side facing the electrode body, and the first sealing ring is arranged in the first annular groove.

[0014] In some embodiments, the vacuum heat treatment furnace electrode further comprises a heat insulation gasket and a connecting ring sleeved outside the cooling member, the heat insulation gasket is located between the flange and the connecting ring and is fixedly connected with the flange and the connecting ring through bolts, and the part of the heat insulation gasket close to the cooling member and the flange has an annular groove, a limiting groove is formed between the annular groove and the end face of the flange, and a limiting ring is arranged outside the cooling member and inserted into the limiting groove, so that the cooling member, the flange, the heat insulation gasket and the connecting ring are axially fixed.

[0015] In some embodiments, the side of the heat insulation gasket away from the flange axially extends to form a shaft sleeve, and the connecting ring is sleeved outside the shaft sleeve.

[0016] In some embodiments, a second annular groove is formed between the corner of the flange and the corner of the limiting ring, and a second sealing ring is arranged in the second annular groove.

[0017] In some embodiments, the vacuum heat treatment furnace electrode further comprises a connecting seat provided with a clamp and sleeved outside the cooling member through the clamp.

[0018] In some embodiments, the vacuum heat treatment furnace electrode further comprises a connector, a water inlet pipe and a water outlet pipe, the front end of the cooling channel is provided with an opening, the connector is connected at the opening, one end of the water inlet pipe is sealingly connected with the connector, and the other end thereof axially extends to the rear end of the cooling channel to form the cooling liquid inlet, and the water outlet pipe is perpendicularly connected with the connector and in communication with the cooling channel to form the cooling liquid outlet.

[0019] In some embodiments, the sleeve is made of boron nitride ceramic.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0022] The vacuum heat treatment furnace electrode of the application can automatically discharge the air in the connecting hole during the installation of the cooling member, avoid air resistance, and enable the cooling member to be smoothly inserted into place, thereby improving the installation convenience and efficiency, reducing the influence of poor air discharge on the close fit of the cooling member and the electrode main body, and improving the connection reliability.

[0023] It is also important that the reserved cavity provides an axial expansion allowance for the thermal expansion of the cooling member, avoids pushing the electrode main body when the cooling member expands axially, effectively relieves the thermal stress on the electrode main body at the bottom of the connecting hole, and thereby prolongs the fatigue life of the end portion of the electrode main body. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a perspective view of the vacuum heat treatment furnace electrode in the embodiment of the application;

[0026] Figure 2 is a side view of the vacuum heat treatment furnace electrode in the embodiment of the application;

[0027] Figure 3 is a sectional perspective view of section A in Figure 2

[0028] Figure 4 is a sectional plan view of section B in Figure 2

[0029] Reference signs:

[0030] electrode main body 1, connecting hole 11, exhaust hole 111;

[0031] cooling member 2, reserved cavity 21, cooling channel 22, limiting ring 23, cooling liquid inlet 221, cooling liquid outlet 222;

[0032] sleeve 3, exhaust passage 31;

[0033] flange plate 4, first sealing ring 41, first annular groove 42, second annular groove 43, second sealing ring 44;

[0034] heat insulation gasket 5, limiting groove 51, shaft sleeve 52;​​

[0035] Connecting ring 6, connecting seat 7, clamp 71, interface 72;

[0036] Joint 8, water inlet pipe 81, water outlet pipe 82.

[0037] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] The electrode for a sintering furnace is usually provided with a cooling member at one end of the electrode body, and the cooling member is provided with a cooling channel for cooling. The heat is taken away by water or cooling liquid in the cooling channel, so as to improve the high-temperature resistance. The cooling member is usually made of metal with good thermal conductivity, and the end of the cooling member is sleeved in the sleeve hole at the end of the electrode body, and is tightly combined with the inner side of the sleeve hole in order to improve the heat conduction efficiency. This causes the following problems: the cooling member is expanded by heat during work and presses the inner wall of the sleeve hole, which easily causes stress fatigue of the end of the electrode body after long-term use, and reduces the service life of the electrode body. Meanwhile, the end of the cooling member needs to press the air in the sleeve hole of the electrode body during installation, which is not convenient for installation.

[0041] To solve the above technical problems, the present embodiment provides a vacuum heat treatment furnace electrode. Referring to Figures 1 to 4 shown, Figure 1 is a perspective view of the vacuum heat treatment furnace electrode in the embodiments of the present application, Figure 2 is a side view of the vacuum heat treatment furnace electrode in the embodiments of the present application, Figure 3 is Figure 2 a cross-sectional perspective view of section A in Figure 4 is Figure 2 a cross-sectional plan view of section B in

[0042] The vacuum heat treatment furnace electrode of the present embodiment comprises an electrode body 1, a cooling member 2 and a sleeve 3. The vacuum heat treatment furnace is taken as an example of a sintering furnace.

[0043] The electrode body 1 is provided with a connecting hole 11 at one end for connecting the cooling element 2, and the bottom of the connecting hole 11 is provided with an exhaust hole 111 for discharging internal air, which penetrates to the outside of the electrode body 1.

[0044] Referring to Figure 3 and Figure 4 , the cooling element 2 is provided in the connecting hole 11 by interference fit, threaded connection or other existing methods, and forms a reserved cavity 21 with the bottom of the connecting hole 11, which provides space for the expansion of the cooling element 2. The cooling element 2 is provided with a cooling channel 22 for conveying cooling liquid, and the two ends of the cooling channel 22 are respectively connected with a cooling liquid inlet 221 and a cooling liquid outlet 222.

[0045] Referring to Figure 1 and Figure 3 , the sleeve 3 is sleeved outside the cooling element 2 and the electrode body 1, and the inner wall of the sleeve 3 and the outer wall of the electrode body 1 form an exhaust passage 31, which is in communication with the outside of the sleeve 3 and the exhaust hole 111.

[0046] When the cooling element 2 is inserted into the connecting hole 11, the internal air enters the annular exhaust passage 31 formed between the inner wall of the sleeve 3 and the outer wall of the electrode body 1 through the exhaust hole 111, and is finally discharged from the outside of the sleeve 3. The design of this airflow path makes it unnecessary to perform additional vacuum pumping during installation, and the cooling element 2 can be inserted into place at one time. At the same time, the reserved cavity 21 formed between the end of the cooling element 2 and the bottom of the connecting hole 11 provides a buffer space for thermal expansion under high temperature working conditions, effectively avoiding crack propagation caused by thermal stress concentration at the end of the electrode body 1. The sleeve 3 wraps the connection part as a whole to form double protection, which not only ensures the air tightness of the exhaust passage 31, but also enhances the mechanical impact resistance of the connection structure.

[0047] On the basis of the above structure, referring to Figure 4 , the vacuum heat treatment furnace electrode further comprises a flange plate 4 and a first sealing ring 41, the flange plate 4 is fixedly sleeved outside the cooling element 2, and is provided with a first annular groove 42 on the side facing the electrode body 1, and the first sealing ring 41 is arranged in the first annular groove 42. When the flange plate 4 is locked with the furnace body of the sintering furnace by bolts, the first sealing ring 41 is radially expanded under pressure to form an axial seal for the connection interface between the flange plate 4 and the furnace body. This sealing structure can self-adaptively compensate for the thermal deformation of metal parts under high temperature environment, preventing gas leakage from the joint.

[0048] In order to further improve the sealing performance, the first annular groove 42 has a trapezoidal cross section, so that the first sealing ring 41 generates three-way deformation when under pressure, realizing durable sealing under dynamic pressure.

[0049] In one embodiment in which the above-mentioned flange plate 4 is fixedly sleeved outside the cooling element 2, referring toFigure 3 As shown, the vacuum heat treatment furnace electrode further comprises a heat insulation gasket 5 and a connecting ring 6 sleeved outside the cooling member 2, the heat insulation gasket 5 is located between the flange plate 4 and the connecting ring 6 and is fixedly connected with the flange plate 4 and the connecting ring 6 through bolts; the part of the heat insulation gasket 5 close to the cooling member 2 and the flange plate 4 has an annular groove, and a limiting groove 51 is formed between the annular groove and the end face of the flange plate 4; the outer side of the cooling member 2 is provided with a limiting ring 23 inserted into the limiting groove 51, so that the cooling member 2, the flange plate 4, the heat insulation gasket 5 and the connecting ring 6 are axially fixed, and thus the flange plate 4 is fixedly sleeved outside the cooling member 2. During installation, the limiting ring 23 is embedded into the limiting groove 51 to form an axial positioning reference, so as to ensure that the coaxiality and axial fixation of each component are maintained during high-temperature expansion. The low-thermal-conductivity characteristic of the heat insulation gasket 5 blocks the heat transfer to the connecting ring 6, avoiding overheating failure of the external connecting components. The pre-tightening force formed by the bolt connection ensures that each component still maintains structural stability under vibration working conditions.

[0050] In some embodiments, referring to Figure 3 As shown, the side of the heat insulation gasket 5 away from the flange plate 4 axially extends to form a shaft sleeve 52, the shaft sleeve 52 is sleeved on the cooling member 2, and the connecting ring 6 is sleeved outside the shaft sleeve 52. For example, the connecting ring 6 is sleeved outside the shaft sleeve 52, and the two form a nested structure with a gap fit. The shaft sleeve 52 provides radial support for the connecting ring 6, preventing eccentric deformation caused by external load, and at the same time, the cylindrical extension thereof forms a heat conduction barrier, blocking the radiant heat of the electrode working area outside the connecting ring 6, so as to reduce the surface temperature of the connecting ring 6.

[0051] In some embodiments, referring to Figure 3 and Figure 4 As shown, a second annular groove 43 is formed between the flange plate 4 and the limiting ring 23, and a second sealing ring 44 is arranged in the second annular groove 43. When the limiting ring 23 is inserted into the limiting groove 51, the second sealing ring 44 simultaneously bears axial compression force and radial expansion force, thereby forming a seal for the gap between the cooling member 2 and the flange plate 4. The second sealing ring 44 and the first sealing ring 41 constitute a gradient sealing system: the first sealing ring 41 mainly blocks the outflow of gas in the furnace body, and the second sealing ring 44 prevents external dust from invading the connecting part. The double sealing enables the electrode to maintain a clean internal structure in a sintering furnace environment with high dust content.

[0052] In some embodiments, referring to Figure 1 and Figure 3 As shown, the vacuum heat treatment furnace electrode further comprises a connecting seat 7, the connecting seat 7 is installed on the rack or furnace shell of the sintering furnace in a bolted manner, the connecting seat 7 is provided with a clamp 71 and is clamped outside the cooling member 2 through the clamp 71. The connecting seat 7 facilitates the installation of the vacuum heat treatment furnace electrode on the rack or furnace shell and facilitates the disassembly.

[0053] In one embodiment, the two ends of the cooling channel 22 are respectively connected with a cooling liquid inlet 221 and a cooling liquid outlet 222. Referring to Figure 1 and Figure 3 As shown in the figures, the electrode of the vacuum heat treatment furnace further comprises a connector 8, a water inlet pipe 81 and a water outlet pipe 82. The front end of the cooling channel 22 is provided with an opening, and the connector 8 is detachably connected to the opening. For example, the connector 8 is connected to the opening by screwing. One end of the water inlet pipe 81 is sealingly connected to the connector 8, and the other end of the water inlet pipe 81 extends axially to the rear end of the cooling channel 22, forming the cooling liquid inlet 221. The water outlet pipe 82 is connected to the connector 8 perpendicularly and communicates with the cooling channel 22, forming the cooling liquid outlet 222. In this way, the cooling liquid flows through the entire cooling channel 22 along a U-shaped path, eliminating the flow dead zone generated by the traditional straight-through pipeline, and improving the heat exchange efficiency.

[0054] For example, the connector 8 adopts a conical sealing structure, which can automatically correct the centering deviation during pipeline connection, preventing interface leakage caused by misalignment.

[0055] In some embodiments, the sleeve 3 is made of boron nitride ceramic. The high thermal conductivity of boron nitride allows the sleeve 3 to quickly conduct heat away from the electrode connection site, while its excellent insulation performance prevents leakage current from forming a loop through the sleeve 3. In high-pressure sintering conditions, the surface resistance of the sleeve 3 remains stable, avoiding short circuit accidents caused by insulation failure. The low thermal expansion coefficient of the ceramic material ensures that the sleeve 3 remains tightly fitted with the metal parts at high temperatures, preventing cracking caused by thermal shock.

[0056] In summary, the electrode of the vacuum heat treatment furnace of the present application forms an exhaust passage 31 through the exhaust hole 111 and the sleeve 3, which can automatically exhaust the air inside the connecting hole 11 during the installation of the cooling member 2, avoiding air resistance, allowing the cooling member 2 to be smoothly inserted into place, improving installation convenience and efficiency, and reducing the impact of poor air exhaust on the tightness of the cooling member 2 and the electrode main body 1, improving connection reliability.

[0057] It is also important that the reserved cavity 21 provides an axial expansion allowance for the thermal expansion of the cooling member 2, preventing the cooling member 2 from pushing the electrode main body 1 when it expands axially, effectively relieving the thermal stress on the electrode main body 1 at the bottom of the connecting hole 11, thereby prolonging the fatigue life of the electrode main body 1.

[0058] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vacuum heat treatment furnace electrode, characterized by, The electrode comprises an electrode body, a cooling member and a sleeve. The electrode body is provided with a connecting hole at one end, and the bottom of the connecting hole is provided with an exhaust hole which penetrates to the outside of the electrode body. The cooling member is arranged in the connecting hole and forms a reserved cavity with the bottom of the connecting hole, and the inside of the cooling member is provided with a cooling channel for conveying cooling liquid, and the two ends of the cooling channel are respectively connected with a cooling liquid inlet and a cooling liquid outlet. The sleeve is arranged outside the partial area of the cooling member and the outside of the electrode body, and an exhaust channel is formed between the inner wall of the sleeve and the outer wall of the electrode body, and the exhaust channel is in communication with the outside of the sleeve and the exhaust hole. The electrode of the vacuum heat treatment furnace further comprises a flange and a first sealing ring, the flange is fixedly sleeved outside the cooling member and is provided with a first annular groove on the side facing the electrode body, and the first sealing ring is arranged in the first annular groove.

2. The vacuum heat treatment furnace electrode according to claim 1, characterized by The electrode of the vacuum heat treatment furnace further comprises a heat insulation gasket and a connecting ring which are sleeved outside the cooling member, the heat insulation gasket is located between the flange and the connecting ring and is fixedly connected with the flange and the connecting ring through bolts, and the part of the heat insulation gasket close to the cooling member and the flange has an annular groove, a limiting groove is formed between the annular groove and the end face of the flange, and the outside of the cooling member is provided with a limiting ring which is inserted into the limiting groove to axially fix the cooling member, the flange, the heat insulation gasket and the connecting ring.

3. The vacuum heat treatment furnace electrode according to claim 2, characterized in that, The side of the heat insulation gasket away from the flange axially extends to form a shaft sleeve, and the connecting ring is sleeved outside the shaft sleeve.

4. The vacuum heat treatment furnace electrode according to claim 3, characterized in that, A second annular groove is formed between the corner of the flange and the corner of the limiting ring, and a second sealing ring is arranged in the second annular groove.

5. The vacuum heat treatment furnace electrode according to claim 3, characterized in that, The electrode of the vacuum heat treatment furnace further comprises a connecting seat which is provided with a clamp and is clamped outside the cooling member through the clamp.

6. The electrode for a vacuum heat treatment furnace according to any one of claims 1 to 5, wherein The electrode of the vacuum heat treatment furnace further comprises a connector, a water inlet pipe and a water outlet pipe, the front end of the cooling channel is provided with an opening, the connector is connected at the opening, one end of the water inlet pipe is sealingly connected with the connector, and the other end thereof axially extends to the rear end of the cooling channel to form the cooling liquid inlet, and the water outlet pipe is perpendicularly connected with the connector and is in communication with the cooling channel to form the cooling liquid outlet.

7. The electrode for a vacuum heat treatment furnace according to any one of claims 1 to 5, wherein The sleeve is made of boron nitride ceramic.

8. The electrode for a vacuum heat treatment furnace according to any one of claims 1 to 5, wherein ​

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