Thermocouple dragging-out device of pressure sintering furnace

Abstract

The utility model discloses a thermocouple dragging-out device of a pressure sintering furnace, and belongs to the technical field of pressure sintering furnaces. The thermocouple seat is fixed on a furnace body, a sealing box is connected outside the thermocouple seat, a round hole is formed in the center of the thermocouple seat and the center of the sealing box, a thermocouple and a pull-out rod can penetrate through the round hole, a double-layer sealing ring is arranged on the pull-out rod, a check block is arranged at the end of the sealing box to prevent the pull-out rod from being popped out, and the whole pull-out rod is driven by an air cylinder. The double-layer sealing ring is composed of the inner sealing ring and the outer sealing ring, when the thermocouple is inserted, the inner sealing ring on the left side is used for sealing, when the thermocouple is pulled out, the outer sealing ring on the right side is used for sealing, the double-layer sealing effect can be achieved under the high-pressure atmosphere in the furnace, and it is guaranteed that gas in the furnace is completely sealed. The check block can prevent the risk that the whole dragging-out rod and the thermocouple burst out due to the fact that the air pressure in the furnace is too high, and the dragging-out and stretching-in problems of the correction thermocouple of the high-temperature air pressure sintering furnace are solved.

Description

Technical Field

[0001] This utility model relates to the field of pressure sintering furnace technology, specifically to a thermocouple pull-out device for pressure sintering furnaces. Background Technology

[0002] A pressure sintering furnace is an electric furnace in which inert gases (such as nitrogen or argon) are introduced into the furnace during the heating and sintering process to achieve a certain pressure (generally between 1-10 MPa), thus achieving the sintering purpose. In a typical pressure sintering furnace, under the protection of inert gas, a tungsten-rhenium thermocouple is used for temperature measurement (below 1900℃). When the required sintering temperature exceeds 1900℃, the tungsten-rhenium thermocouple is easily damaged or even malfunctions. Therefore, an infrared thermometer is needed to replace the tungsten-rhenium thermocouple for temperature measurement. However, the infrared thermometer requires calibration using a thermocouple with relatively accurate readings at a low temperature (between 1400-1900℃). This necessitates initial temperature measurement and calibration using a tungsten-rhenium thermocouple at a low temperature. When the temperature rises to a high temperature (above 1900℃), the tungsten-rhenium thermocouple is removed from the furnace (to protect it), and the infrared thermometer is used for temperature measurement. During the switching process, the tungsten-rhenium thermocouple is removed from the furnace under high-pressure gas conditions. Ensuring both safety and preventing gas leakage requires a special thermocouple removal device. Currently, most thermocouple removal devices on the market are designed for vacuum furnaces and do not consider the actual conditions of high-pressure gas inside the furnace, making them unsuitable for pressure furnaces. Utility Model Content

[0003] The purpose of this invention is to provide a thermocouple pull-out device for a pressure sintering furnace, which is equipped with a double-layer seal, capable of sealing both in a vacuum environment and under a high-pressure atmosphere inside the furnace; at the same time, a stop is set at the position where the thermocouple is pulled out to prevent the risk of the thermocouple directly bursting out due to excessive gas pressure inside the furnace, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a thermocouple pull-out device for a pressure sintering furnace, comprising a furnace body, a thermocouple seat, a sealing box, a pull-out rod, a thermocouple, and a cylinder. The thermocouple seat is fixed to the furnace body, and the sealing box is connected to the outside of the thermocouple seat. The other end of the sealing box is connected to a cylinder support seat. The cylinder is fixed to the cylinder support seat, and the extended end of the cylinder is fixedly connected to the pull-out rod via a connecting rod. The pull-out rod passes through the thermocouple seat and the sealing box, and the thermocouple is threadedly connected inside the pull-out rod. The pull-out rod has a double-layer sealing ring at one end near the thermocouple seat, and is sealed to the sealing box through the double-layer sealing ring. The sealing box has a stop block at one end near the cylinder support seat to limit the pull-out position of the pull-out rod.

[0005] Preferably, the two ends of the sealing box are respectively connected to the thermocouple seat and the cylinder support seat by bolts.

[0006] Preferably, the thermocouple holder and the sealing box are provided with a circular hole at the center for the thermocouple and the pull rod to pass through.

[0007] Preferably, the double-layer sealing ring consists of two sets of sealing rings, one inner and one outer. Each set of sealing rings includes two sealing O-rings. When the thermocouple is inserted, it is sealed by the inner sealing ring on the left, and when the thermocouple is pulled out, it is sealed by the outer sealing ring on the right.

[0008] Preferably, the stop is an annular protrusion structure, so that when the pull rod is pulled outward, the O-ring on the outer sealing ring will be blocked by the protrusion of the stop.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This thermocouple pull-out device for pressure sintering furnace is installed on the outer surface of the furnace shell. When tungsten-rhenium thermocouples are needed for temperature measurement at low temperatures inside the furnace, a cylinder drives the thermocouple to extend into the furnace. When the furnace temperature rises above 1900℃, infrared temperature measurement is calibrated, and the tungsten-rhenium thermocouple is pulled out by the cylinder and concealed within the furnace shell insulation layer, thus protecting the thermocouple. Furthermore, considering the characteristics of the pressure sintering furnace, a double-layer seal is designed, allowing for sealing both in a vacuum environment and under a high-pressure atmosphere. A stop is also placed at the position where the thermocouple is pulled out to prevent the risk of the thermocouple bursting out due to excessive furnace pressure. This solves the problem of pulling out and extending the calibration thermocouple in high-temperature pressure sintering furnaces, making temperature measurement more accurate and significantly extending the service life of the thermocouples. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is an enlarged view of part A of this utility model.

[0013] In the diagram: 1. Furnace body; 2. Thermocouple seat; 3. Sealing box; 4. Double sealing ring; 5. Cylinder support seat; 6. Stop block; 7. Pull-out rod; 8. Thermocouple; 9. Cylinder. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-2This embodiment provides a thermocouple pull-out device for a pressure sintering furnace, including a furnace body 1, a thermocouple seat 2, a sealing box 3, a pull-out rod 7, a thermocouple 8, and a cylinder 9. The thermocouple seat 2 is fixed to the furnace body 1, and the sealing box 3 is connected to the outside of the thermocouple seat 2. The other end of the sealing box 3 is connected to a cylinder support seat 5. Specifically, both ends of the sealing box 3 are respectively connected to the thermocouple seat 2 and the cylinder support seat 5 by bolts. The cylinder 9 is fixed to the cylinder support seat 5, and the extended end of the cylinder 9 is fixedly connected to the pull-out rod 7 by a connecting rod. The cylinder 9 serves as a power device to drive the pull-out rod 7 and the thermocouple 8 to be pulled out and extended. The pull-out rod 7 passes through the thermocouple seat 2 and the sealing box 3. The thermocouple 8 and the pull-out rod 7 are located at the center of the thermocouple seat 2 and the sealing box 3. The circular hole through which the extension rod 7 passes is threaded to connect the thermocouple 8 inside the extension rod 7. The extension rod 7 has a double-layer sealing ring 4 at one end near the thermocouple seat 2, and is sealed to the sealing box 3 through the double-layer sealing ring 4. The sealing box 3 has a stop block 6 at one end near the cylinder support seat 5 to limit the extension position of the extension rod 7. Specifically, the double-layer sealing ring 4 consists of two sets of sealing rings, one inner and one outer. Each set of sealing rings contains two sealing O-rings. When the thermocouple 8 is inserted, it is sealed by the inner sealing ring on the left. When the thermocouple 8 is pulled out, it is sealed by the outer sealing ring on the right. The stop block 6 is an annular protrusion structure. When the extension rod 7 is pulled outward, the O-ring on the outer sealing ring is blocked by the protrusion of the stop block 6.

[0016] Working principle: The thermocouple pull-out device for the pressure sintering furnace of this utility model includes a thermocouple seat 2 fixed on the furnace body 1. Both the thermocouple seat 2 and the sealing box 3 have a central hole for the thermocouple 8 and the pull-out rod 7 to pass through. The pull-out rod 7 is equipped with a double-layer sealing ring 4. A stop block 6 is provided at the end of the sealing box 3 to prevent the pull-out rod 7 from popping out. The entire pull-out rod 7 is driven by a cylinder 9. The double-layer sealing ring 4 in the sealing box 3 consists of two sets of sealing rings, inner and outer. Each set of sealing rings contains two sealing O-rings. When the thermocouple 8 is inserted, it is sealed by the inner sealing ring on the left. When the thermocouple 8 is pulled out, it is sealed by the outer sealing ring on the right. This provides a double-layer seal under the high-pressure atmosphere inside the furnace, ensuring complete sealing of the gas inside the furnace. The temperature-measuring thermocouple 8 is tightly connected to the pull-out rod 7 by threads, ensuring that the two are integrated as a whole. The stop block 6 is a safety feature. It is a ring-shaped protrusion. When the pull rod 7 is pulled outward, the O-ring on the outer sealing ring will be blocked by the protrusion of the stop block. Once it is in place, it will not be pulled out further, preventing the risk of the entire pull rod 7 and thermocouple 8 being ruptured due to excessive gas pressure in the furnace.

[0017] In summary, the thermocouple pull-out device for the pressure sintering furnace of this utility model is installed on the outer surface of the furnace shell. When the temperature of the tungsten-rhenium thermocouple 8 needs to be measured at low temperatures inside the furnace, the cylinder 9 drives the thermocouple 8 to extend into the furnace. When the temperature inside the furnace rises to above 1900℃, the infrared temperature measurement is calibrated, and the cylinder 9 drives the tungsten-rhenium thermocouple 8 to be pulled out and hidden inside the furnace shell insulation layer, thus protecting the tungsten-rhenium thermocouple 8. This solves the problem of pulling out and extending the calibration thermocouple 8 in high-temperature pressure sintering furnaces, making the temperature measurement of high-temperature pressure sintering furnaces more accurate. The safe pull-out of the tungsten-rhenium thermocouple 8 under high temperature and pressure greatly extends its service life. At the same time, safety measures are taken into consideration, making the product safe to use and preventing accidents.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermocouple pull-out device for a pressure sintering furnace, comprising a furnace body (1), a thermocouple seat (2), a sealing box (3), a pull-out rod (7), a thermocouple (8), and a cylinder (9), characterized in that: The thermocouple seat (2) is fixed on the furnace body (1). The outside of the thermocouple seat (2) is connected to the sealing box (3). The other end of the sealing box (3) is connected to the cylinder support seat (5). The cylinder (9) is fixed on the cylinder support seat (5). The extended end of the cylinder (9) is fixedly connected to the pull rod (7) through the connecting rod. The pull rod (7) passes through the thermocouple seat (2) and the sealing box (3). The thermocouple (8) is connected to the pull rod (7) through the thread. The pull rod (7) is provided with a double sealing ring (4) at one end near the thermocouple seat (2). It is sealed to the sealing box (3) through the double sealing ring (4). The sealing box (3) is provided with a stop (6) at one end near the cylinder support seat (5) to limit the pull position of the pull rod (7).

2. The thermocouple pull-out device for a pressure sintering furnace according to claim 1, characterized in that: The two ends of the sealing box (3) are respectively connected to the thermocouple seat (2) and the cylinder support seat (5) by bolts.

3. The thermocouple pull-out device for a pressure sintering furnace according to claim 1, characterized in that: The thermocouple holder (2) and the sealing box (3) are provided with a circular hole at the center for the thermocouple (8) and the pull rod (7) to pass through.

4. The thermocouple pull-out device for a pressure sintering furnace according to claim 1, characterized in that: The double-layer sealing ring (4) consists of two sets of sealing rings, one inside and one outside. Each set of sealing rings contains two sealing O-rings. When the thermocouple (8) is inserted, it is sealed by the inner sealing ring on the left side. When the thermocouple (8) is pulled out, it is sealed by the outer sealing ring on the right side.

5. The thermocouple pull-out device for a pressure sintering furnace according to claim 4, characterized in that: The stop block (6) is an annular protrusion structure. When the pull rod (7) is pulled outward, the O-ring on the outer sealing ring will be blocked by the protrusion of the stop block (6).

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