Oxygen concentration sampling device for vacuum furnace and vacuum furnace comprising same

Abstract

The utility model discloses an oxygen concentration sampling device for a vacuum furnace and the vacuum furnace comprising the oxygen concentration sampling device. The oxygen concentration sampling device comprises an oxygen analyzer as well as a first sampling pipe, a second sampling pipe and a third sampling pipe which are respectively connected with the oxygen analyzer, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve are sequentially arranged on the first sampling pipe, the second sampling pipe and the third sampling pipe and are respectively connected to a preheating area, a high-temperature area and a cooling area of the vacuum furnace; the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all communicated with the vacuum generator; the utility model can solve the problems that the traditional vacuum furnace can only reflect the concentration of one part in real time and cannot reflect the abnormal gas atmosphere in the furnace, so that the abnormal risk of the furnace passing product is greatly increased.

Description

Technical Field

[0001] This utility model relates to the field of vacuum furnaces, specifically to an oxygen concentration sampling device for a vacuum furnace and a vacuum furnace containing the same. Background Technology

[0002] Due to the requirements of reflow soldering processes, the oxygen concentration in the reflow oven atmosphere needs to be controlled, making a rapid and accurate oxygen concentration sampling and analysis system crucial. Oxygen concentration sampling points are typically required at the inlet preheating zone, the intermediate high-temperature zone, and the outlet cooling zone of the vacuum furnace. However, due to the design of traditional vacuum furnace sampling systems and the response limitations of oxygen concentration analyzers, a single analyzer can only reflect the concentration at one location in real time, failing to promptly detect abnormalities in the furnace atmosphere and significantly increasing the risk of defects in reflowed products. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problem, namely that traditional vacuum furnaces can only reflect the concentration at one location in real time, and cannot detect abnormal gas atmosphere in the furnace in time, which greatly increases the risk of abnormal products after furnace treatment.

[0004] In a first aspect, the present invention provides an oxygen concentration sampling device for a vacuum furnace, comprising: an oxygen analyzer, and a first sampling tube, a second sampling tube, and a third sampling tube respectively connected to the oxygen analyzer; the first sampling tube, the second sampling tube, and the third sampling tube are sequentially provided with a first solenoid valve, a second solenoid valve, and a third solenoid valve, and are respectively connected to the preheating zone, the high-temperature zone, and the cooling zone of the vacuum furnace; the first solenoid valve, the second solenoid valve, and the third solenoid valve are all connected to a vacuum generator.

[0005] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, the first sampling tube, the second sampling tube, and the third sampling tube are connected to the oxygen analyzer via a three-position five-hole gas separator.

[0006] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, a first filter is provided on the first sampling tube, a second filter is provided on the second sampling tube, and a third filter is provided on the third sampling tube.

[0007] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, the three-position five-hole gas separator is connected to the oxygen analyzer through a gas guide pipe, and the gas guide pipe is equipped with an activated carbon adsorption structure.

[0008] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, the activated carbon adsorption structure is detachably configured on the gas guide pipe.

[0009] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, the first sampling tube, the second sampling tube, and the third sampling tube are made of stainless steel.

[0010] In the preferred embodiment of the oxygen concentration sampling device for the vacuum furnace described above, the inner walls of the first sampling tube, the second sampling tube, the third sampling tube, and the three-position five-hole gas distributor are coated with polytetrafluoroethylene.

[0011] In a second aspect, the present invention also provides a vacuum furnace, the vacuum furnace including the oxygen concentration sampling device for the vacuum furnace described above.

[0012] The beneficial effects of this utility model are as follows: By controlling the opening and closing of the first sampling tube with the first solenoid valve, the second sampling tube with the second solenoid valve, and the third sampling tube with the third solenoid valve, the on / off state of each sampling tube can be switched in real time, thereby realizing the switching of sampling positions in the vacuum furnace. Furthermore, the operation of the vacuum generator ensures that the gas in the unsampled sampling tube is released in real time, ensuring the consistency of the gas in the pipeline to be switched with the atmospheric gas at the corresponding sampling position in the furnace. In addition, since the gas flow rate changes relatively little when switching pipelines, the gas flow rate change before and after the oxygen analyzer is small, reducing the measurement fluctuation of the oxygen analyzer itself caused by the impact of gas flow rate changes. The oxygen analyzer reflects the gas concentration, realizing the concentration detection of the gas atmosphere in the furnace. Attached Figure Description

[0013] Figure 1 This is a diagram showing the connection relationships of the various components of this utility model;

[0014] In the diagram: Oxygen analyzer 1, First sampling tube 2, Second sampling tube 3, Third sampling tube 4, First solenoid valve 5, Second solenoid valve 6, Third solenoid valve 7, Vacuum generator 8, Three-position five-hole gas distributor 9, First filter 10, Second filter 11, Third filter 12, Gas guide tube 13, Activated carbon adsorption structure 14. Detailed Implementation

[0015] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0016] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] like Figure 1 As shown, the oxygen concentration sampling device for a vacuum furnace of this utility model includes: an oxygen analyzer 1, and a first sampling tube 2, a second sampling tube 3, and a third sampling tube 4 respectively connected to the oxygen analyzer 1; a first solenoid valve 5, a second solenoid valve 6, and a third solenoid valve 7 are sequentially provided on the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4, which are respectively connected to the preheating area, the high-temperature area, and the cooling area of ​​the vacuum furnace; the first solenoid valve 5, the second solenoid valve 6, and the third solenoid valve 7 are all connected to a vacuum generator 8.

[0019] See Figure 1 The first sampling tube 2, the second sampling tube 3, and the third sampling tube 4 are made of hard metal. This design reduces the possibility of damage to the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4 due to excessively high temperatures in the vacuum furnace. The first sampling tube 2 is equipped with a first solenoid valve 5 for controlling the opening or closing of the first sampling tube 2. The first sampling tube 2 is connected to the oxygen analyzer 1 and the preheating area of ​​the vacuum furnace. The first solenoid valve 5 is connected to the vacuum generator 8. The second sampling tube 3 is equipped with a second solenoid valve 6 for controlling the opening or closing of the second sampling tube 3. The second sampling tube 3 is connected to the oxygen analyzer 1 and the high-temperature area of ​​the vacuum furnace. The second solenoid valve 6 is connected to the vacuum generator 8. The third sampling tube 4 is equipped with a third solenoid valve 7 for controlling the opening or closing of the third sampling tube 4. The third sampling tube 4 is connected to the oxygen analyzer 1 and the cooling area of ​​the vacuum furnace. The third solenoid valve 7 is connected to the vacuum generator 8.

[0020] Specifically, when detecting oxygen concentration in the preheating area of ​​the vacuum furnace, the first solenoid valve 5 can be opened, the second solenoid valve 6 and the third solenoid valve 7 can be closed, and the gas in the second sampling tube 3 between the vacuum furnace and the second solenoid valve 6 can be extracted using the vacuum generator 8, and the gas in the third sampling tube 4 between the vacuum furnace and the support of the third solenoid valve 7 can be extracted. At this time, the gas in the preheating area of ​​the vacuum furnace enters the oxygen analyzer 1 through the first sampling tube 2, so that the oxygen analyzer 1 only detects the oxygen concentration of the gas in the preheating area of ​​the vacuum furnace, thereby improving the accuracy of the oxygen concentration detection at the predetermined position of the vacuum furnace. Furthermore, by controlling the opening or closing of the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4 through the first solenoid valve 5, the second solenoid valve 6, and the third solenoid valve 7, the gas flow rate can be reduced, resulting in a low change in the gas flow rate entering the oxygen analyzer 1 through the first sampling tube 2, the second sampling tube 3, or the third sampling tube 4. This reduces the measurement fluctuations of the oxygen analyzer 1 itself caused by the impact of gas flow rate changes, thereby improving the accuracy of the measurement data of this application.

[0021] It should be noted that the process of detecting the gas in the high-temperature area or cooling area of ​​the vacuum furnace adopts the same detection method as the preheating area mentioned above. It only requires controlling the opening and closing of the first solenoid valve 5, the second solenoid valve 6, or the third solenoid valve 7. It has the characteristics of simple structure, convenient operation, and accurate oxygen concentration detection data, and is practical.

[0022] In one or more embodiments, the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4 are connected to the oxygen analyzer 1 through a three-position five-hole gas separator 9.

[0023] See Figure 1 The three-position five-hole gas separator 9 has at least three inlets and one outlet, with the outlet connected to the inlets. The three inlets are respectively connected to the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4, and the outlet is connected to the gas collection port of the oxygen analyzer 1 through a pipeline. When the first sampling tube 2 is in the open state and the second sampling tube 3 and the third sampling tube 4 are in the closed state, the gas in the first sampling tube 2 can enter the oxygen analyzer 1 through the three-position five-hole gas separator 9, and the portion of the second sampling tube 3 between the second solenoid valve 6 and the three-position five-hole gas separator 9, and the portion of the third sampling tube 4 between the third solenoid valve 7 and the third solenoid valve 6... Due to the pressure difference between the three five-hole gas separators 9, the gas in the portion between them will not enter the oxygen analyzer 1. Similarly, when the second sampling tube 3 is open, the gas in the first sampling tube 2 and the third sampling tube 4 will not enter the oxygen analyzer 1, and when the third sampling tube 4 is open, the gas in the first sampling tube 2 and the second sampling tube 3 will not enter the oxygen analyzer 1. This ensures that the oxygen analyzer 1 of this application can accurately measure the oxygen concentration in the preheating area, high-temperature area and cooling area of ​​the vacuum furnace, and ensures the accuracy of the measurement data.

[0024] In one or more embodiments, a first filter 10 is disposed on the first sampling tube 2, a second filter 11 is disposed on the second sampling tube 3, and a third filter 12 is disposed on the third sampling tube 4. See also Figure 1 The filter is used to remove fine particulate impurities present in the gas, reducing the impact of impurities on the first solenoid valve 5, the second solenoid valve 6, or the third solenoid valve 7, thereby extending the service life of these valves. In addition, the filter can also filter some gases other than oxygen. This feature improves the accuracy of oxygen analyzer 1 in detecting oxygen concentration in various areas within the vacuum furnace. It should be noted that the specific type of filter is not limited and should be selected based on actual production needs.

[0025] In one or more embodiments, the three-position five-hole gas separator 9 is connected to the oxygen analyzer 1 through the gas guide tube 13, and the gas guide tube 13 is equipped with an activated carbon adsorption structure 14; the activated carbon adsorption structure 14 is detachably mounted on the gas guide tube 13.

[0026] See Figure 1 The activated carbon adsorption structure 14 is used to adsorb gases other than oxygen, including some corrosive gases, achieving secondary filtration of the gas to be detected and improving the accuracy of data measurement. It should be noted that the activated carbon adsorption structure 14 can also adsorb some small particulate impurities, reducing the possibility of contamination of the oxygen analyzer 1. Furthermore, the activated carbon adsorption structure 14 is detachably mounted on the gas guide tube 13, allowing for easy replacement of the activated carbon adsorption structure 14.

[0027] In one or more embodiments, the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4 are made of stainless steel. This design prevents corrosion of the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4, extends their service life, reduces contamination of the gas transported within them, and improves the accuracy of the data detection in this application.

[0028] In one or more embodiments, the inner walls of the first sampling tube 2, the second sampling tube 3, the third sampling tube 4, and the three-position five-hole gas separator 9 are coated with a polytetrafluoroethylene (PTFE) coating. It should be noted that the PTFE coating has certain self-lubricating and anti-corrosion functions, which can further reduce the possibility of corrosion in the first sampling tube 2, the second sampling tube 3, and the third sampling tube 4.

[0029] In addition, the present invention also provides a vacuum furnace having an oxygen concentration sampling device for a vacuum furnace as described in any of the above embodiments.

[0030] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. An oxygen concentration sampling device for a vacuum furnace, characterized by, The device comprises: an oxygen analyzer, and a first sampling pipe, a second sampling pipe and a third sampling pipe connected to the oxygen analyzer respectively; a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve are arranged on the first sampling pipe, the second sampling pipe and the third sampling pipe in sequence and are connected to a preheating area, a high-temperature area and a cooling area of a vacuum furnace respectively; the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are communicated with a vacuum generator.

2. The oxygen concentration sampling device for a vacuum furnace according to claim 1, characterized by: The first sampling pipe, the second sampling pipe and the third sampling pipe are communicated with the oxygen analyzer through a three-position five-hole gas distribution element.

3. The oxygen concentration sampling device for a vacuum furnace according to claim 1 or 2, characterized by: A first filter is arranged on the first sampling pipe, a second filter is arranged on the second sampling pipe, and a third filter is arranged on the third sampling pipe.

4. The oxygen concentration sampling device for a vacuum furnace according to claim 2, characterized by: The three-position five-hole gas distribution element is communicated with the oxygen analyzer through a gas guide pipe, and an activated carbon adsorption structure is arranged on the gas guide pipe.

5. The oxygen concentration sampling device for a vacuum furnace according to claim 4, characterized by: The activated carbon adsorption structure is detachably arranged on the gas guide pipe.

6. The oxygen concentration sampling device for a vacuum furnace according to claim 1, characterized by: The first sampling pipe, the second sampling pipe and the third sampling pipe are made of stainless steel.

7. The oxygen concentration sampling device for a vacuum furnace according to claim 1, characterized by: The inner walls of the first sampling pipe, the second sampling pipe, the third sampling pipe and the three-position five-hole gas distribution element are sprayed with a polytetrafluoroethylene coating.

8. A vacuum furnace, characterized by The device comprises the oxygen concentration sampling device for a vacuum furnace according to any one of claims 1-7.

Images