Anaerobic oven damper controller

Abstract

The application discloses an oxygen-free oven economizer controller and belongs to the technical field of oxygen-free ovens. A constant-pressure bin pre-filled with inert gas is arranged in the body. The pressure of the constant-pressure bin is greater than the rated pressure of a nitrogen-filled cavity in the oven. The constant-pressure bin is communicated with the bottom end of a vertically arranged strip-shaped channel. A strip-shaped column is vertically and slidingly arranged in the strip-shaped channel. A limiting piece is arranged at the top end of the strip-shaped channel. The constant-pressure bin is communicated with the nitrogen-filled cavity in the oven through an elongated heat insulation pipeline. When the pressure of the nitrogen-filled cavity is at the rated pressure, the strip-shaped column slides to the bottom end of the strip-shaped channel under the joint action of nitrogen pressure and gravity. At this time, the valve does not inject nitrogen into the nitrogen-filled cavity. When the strip-shaped column moves upward to contact the limiting piece, the valve is opened to inject nitrogen into the nitrogen-filled cavity. The application has the advantages of simple and compact structure, pure mechanical economizer control, high-temperature resistance and small restriction on the structure of the oven.

Description

Technical Field

[0001] This invention relates to an oxygen-free drying oven, specifically an oxygen-free drying oven gas-saving controller. Background Technology

[0002] When working, an oxygen-free oven is filled with chemically stable, inert gases, such as nitrogen in the nitrogen-filled chamber, to prevent materials from oxidizing during baking. It is primarily used in the manufacturing of IC packaging, LCD transistors, sensors, diodes, and integrated circuit boards. When using an oxygen-free oven, gases such as nitrogen or carbon dioxide need to be introduced, and the amount of nitrogen introduced into the chamber must be flexibly adjusted and controlled. Existing oxygen-free ovens require pressure sensors combined with solenoid valves to detect the nitrogen content in the chamber and determine whether nitrogen needs to be added. This method requires the pressure sensor to be heat-resistant, and because the control involves weak electrical signals, it needs to be performed at a relatively low temperature, while the internal temperature of the oven is high. Therefore, the overall structural design of the drying oven has more requirements and greater limitations, and the nitrogen input regulation is prone to failure due to high temperatures. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a gas-saving controller for an oxygen-free drying oven, which solves the problem that the sensor control mechanism for automatic nitrogen replenishment in oxygen-free drying ovens has high temperature requirements, affects the overall oven structure design, is easily affected by high temperatures, and has great limitations in use.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gas-saving controller for an oxygen-free oven, comprising a main body and a valve for injecting nitrogen into the nitrogen-filling chamber of the oven; a constant-pressure chamber pre-filled with inert gas is provided in the main body, the pressure of the constant-pressure chamber being greater than the rated pressure of the nitrogen-filling chamber inside the oven; the constant-pressure chamber is connected to the bottom end of a vertically arranged strip channel, and a strip column is vertically and slidably provided in the strip channel; a limiting component is installed at the top end of the strip channel to prevent the strip column from sliding upward; the top end of the strip channel is also connected to an absorption chamber, which is connected to the nitrogen-filling chamber inside the oven through a slender insulated pipe; when the pressure of the nitrogen-filling chamber is at the rated pressure, the strip column slides down to the bottom end of the strip channel under the combined action of nitrogen pressure and its own weight, and at this time the valve does not inject nitrogen into the nitrogen-filling chamber; when the strip column moves upward to contact the limiting component, the valve opens and injects nitrogen into the nitrogen-filling chamber.

[0007] Furthermore, the strip column controls the valve to inject nitrogen into the nitrogen filling chamber via a sliding pin, which is slidably installed in the control chamber of the main body; when the strip column moves upward and contacts the limiting member, the sliding pin can be squeezed by the strip column and retracted into the control chamber, thus opening the valve; conversely, if the strip column moves downward and the end of the sliding pin extends into the strip channel, the valve will be closed.

[0008] Furthermore, the valve includes a valve orifice, a valve core, a conical spring, and a slide rod. The valve orifice is horizontally disposed within the body and includes a narrow orifice at the inlet and a wide orifice at the outlet. The narrow orifice and the wide orifice are coaxially integrally formed. An outlet pipe communicating with the nitrogen filling chamber is provided on the wall of the orifice at the connection between the wide orifice and the narrow orifice. An inlet pipe communicating with a nitrogen source is provided in the narrow orifice. The valve core is fixedly connected to the slide rod at one end of the wide orifice. The slide rod is axially slidably mounted on a bushing inside the wide orifice, and the bushing and the valve core are elastically connected by the conical spring sleeved on the slide rod.

[0009] The valve core compresses the conical spring to connect the inlet and outlet pipes only when the sliding pin retracts into the control chamber.

[0010] Furthermore, the valve core includes two oppositely arranged conical portions, with the bottom ends of the two conical portions coaxially aligned and integrally formed. The conical surface of the conical portion facing the intake pipe side seals against the conical wall at the junction of the narrow and wide orifices.

[0011] Preferably, based on the above, the sliding pin is installed obliquely and slidably in the body, the axis of the sliding pin is at an acute angle to the axis of the valve hole, the sliding pin is elastically installed in the control cavity by a return spring, a round rod is fixed to the lower end of the sliding pin, the return spring is sleeved on the round rod, and when the sliding pin retracts into the control cavity, it squeezes the return spring.

[0012] The free end of the round rod is connected to an inclined rack, which meshes with a cylindrical gear. A locking element is also radially fixed to the gear shaft of the cylindrical gear. When the sliding pin is fully retracted into the control cavity, the locking element rotates into the locking groove on the slide rod to prevent the slide rod and valve core from moving in the direction of opening the valve.

[0013] Furthermore, the end of the sliding pin that can extend into the strip channel is an arc surface, and the upper surface of the arc surface is a sphere with a radius equal to the radius of the sliding pin, and the lower surface of the arc surface is a sphere with its center above the sliding pin and a radius greater than the radius of the sliding pin; the bottom of the strip column is a conical surface, and the top side facing the control cavity is a chamfered slope.

[0014] Furthermore, the limiting component is a ring, which is coaxially fixed in the strip channel. The top of the strip column has a plane connected to the chamfered surface, and the plane is directly opposite the end face of the ring.

[0015] Furthermore, a baffle is fixed to the side wall of the end of the sliding pin near the round rod. The baffle can abut against one of the side walls of the control cavity. When abutting against the baffle, the sliding pin extends to the limit position outside the control cavity, and at this time the chamfered bevel contacts the lower curved surface.

[0016] Furthermore, in the above design, the constant pressure chamber and the narrow hole are separated by a partition, and the two are arranged coaxially.

[0017] (III) Beneficial Effects

[0018] This invention provides a gas-saving controller for an oxygen-free drying oven, offering the following advantages: This invention eliminates the need for traditional sensors and controllers, employing a purely mechanical opening and closing control. It automatically correlates with the nitrogen level inside the oven and automatically replenishes nitrogen. The pressure of a constant-pressure chamber, higher than the internal nitrogen pressure, is compared and measured against the combined pressure of the rated nitrogen pressure inside the oven and the weight of the pressure bar. This effectively amplifies the nitrogen pressure inside the oven before comparing it with the constant-pressure chamber, controlling the opening and closing of valves, their speed, and the throttling rate. The pressure difference is used to move the pressure bar, thereby controlling the valve's opening and closing. Furthermore, because it is a mechanical automatic control, it is less affected by the oven's temperature, imposes fewer constraints on the overall oven structure, and its performance is not limited by high temperatures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one structure of the present invention;

[0020] Figure 2 This is a schematic diagram of one end of the sliding pin.

[0021] In the diagram: 1. Main body; 2. Constant pressure chamber; 3. Sampling chamber; 4. Sampling tube; 5. Strip channel; 6. Strip column; 7. Chamfered bevel 701; 702. Plane; 8. Limiting element; 9. Sliding pin; 9. Upper curved surface 901; 902. Lower curved surface 902; 10. Control chamber; 11. Return spring; 12. Round rod; 13. Baffle; 14. Cylindrical gear; 15. Rack; 16. Locking element; 17. Narrow hole; 18. Valve core; 19. Wide hole; 20. Conical spring; 21. Bushing; 22. Slide rod; 23. Inlet pipe; 24. Outlet pipe; 25. Partition plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 This embodiment describes a gas-saving controller for an oxygen-free oven. Structurally, it includes a main body 1 and a valve 5 that injects nitrogen into the nitrogen-filling chamber of the oven (not shown in the figure) and discharges oxygen to obtain an oxygen-free atmosphere. The nitrogen-filling chamber is not shown in detail in this embodiment; it is generally designed to adapt to the actual structure of the oven. The key feature is a constant-pressure chamber 2 pre-filled with inert gas within the main body 1. The pressure of the constant-pressure chamber 2 is greater than the rated pressure of the nitrogen-filling chamber inside the oven, preferably slightly higher. This constant-pressure chamber 2 is connected to the bottom end of a vertically arranged strip channel 6. A strip column 7 is vertically and slidably fitted within the strip channel 6. The surface of the strip column 7 is smooth and slides in a dynamic seal with the strip channel 6. A limiting element 8 is installed at the top of the strip channel 6 to prevent the strip column 7 from sliding upwards further, thus preventing the strip column 7 from being forced into other spaces when the pressure difference between the two ends of the strip channel 6 becomes too large. During manufacturing, the top end of the strip channel 6 is also connected to a sampling chamber 3. The sampling chamber 3 is connected to the nitrogen filling chamber inside the oven through a slender sampling pipe. When the pressure of the nitrogen filling chamber is at the rated pressure or within a certain set range, the strip column 7 can slide down to the bottom of the strip channel 6 under the combined action of nitrogen pressure and its own weight. At this time, the pressure in the nitrogen filling chamber is not less than the required working pressure value, that is, the amount of nitrogen is sufficient, so the strip column 7 can be pushed down. Therefore, naturally, the valve 5 will not inject nitrogen into the nitrogen filling chamber at this time. When the strip column 7 moves up to contact the limiting member 8, the valve 5 opens and injects nitrogen into the nitrogen filling chamber to replenish nitrogen. It is particularly noteworthy that during the sliding process of the strip column 7, the control valve 5 also has a specific stroke. During the control of the valve 5, the nitrogen intake is gradually adjusted. The reason for using a pre-filled constant pressure chamber 2 in the above design structure is mainly to compare the pressure in the nitrogen filling chamber in real time. Further effects and design purposes will be discussed later.

[0024] As one of the specific implementation details, such as Figure 1The strip column 7 controls the valve 5 to inject nitrogen into the nitrogen filling chamber via a sliding pin 9. The sliding pin 9 is slidably installed in the control chamber 10 of the main body 1. When the strip column 7 moves upward and contacts the limiting member 8, the sliding pin 9 can be squeezed by the strip column 7 and retracted into the control chamber 10, causing the valve 5 to open. Conversely, if the strip column 7 moves downward and causes the end of the sliding pin 9 to extend into the strip channel 6, the valve 5 will close. That is, at this time, there is enough nitrogen, and the valve 5 will also close. Specifically, the valve 5 includes a valve orifice, a valve core 18, a conical spring 20, and a slide rod 22. The valve orifice is horizontally disposed within the body 1. The valve orifice includes a narrow orifice 17 at the inlet and a wide orifice 19 at the outlet. The narrow orifice 17 and the wide orifice 19 are coaxially integrally formed. An outlet pipe 24 communicating with the nitrogen filling chamber is provided on the wall of the orifice at the connection between the wide orifice 19 and the narrow orifice 17. An inlet pipe 23 communicating with the nitrogen source is provided in the narrow orifice 17. The valve core 18 is located at one end of the wide orifice 19 and is fixedly connected to the slide rod 22. The slide rod 22 is axially slidably mounted on the bushing 21 inside the wide orifice 19. The bushing 21 and the valve core 18 are elastically connected by the conical spring 20 sleeved on the slide rod 22. The valve core 18 compresses the conical spring 20 only when the sliding pin 9 retracts into the control chamber 10, thus connecting the inlet pipe 23 and the outlet pipe 24. When the strip column 7 presses against the sliding pin 9, it moves the slide rod 22 step by step, causing the valve core 18 to move step by step. The gap between the valve core 18 and the valve hole changes step by step, thereby controlling the nitrogen gas flow. In order to achieve one-piece manufacturing and simple molding, the constant pressure chamber 2 and the narrow hole 17 are separated by a partition 25 during manufacturing, and the two are arranged coaxially.

[0025] When making it, it is best to do so as follows: Figure 1 As shown, the valve core 18 includes two oppositely arranged conical portions with their bottom ends coaxially aligned and integrally formed. The conical surface of the conical portion facing the intake pipe 23 side seals against the conical wall at the junction of the narrow hole 17 and the wide hole 19 to facilitate flow diversion and better throttling control.

[0026] More specifically, in this embodiment, as Figure 1The sliding pin 9 is obliquely and slidably installed inside the body 1. The axis of the sliding pin 9 forms an acute angle with the axis of the valve hole. The sliding pin 9 is elastically installed in the control cavity 10 by a return spring 11. A round rod 12 is fixedly connected to the lower end of the sliding pin 9. The return spring 11 is sleeved on the round rod 12. When the sliding pin 9 retracts into the control cavity 10 due to the compression of the strip column 7, it compresses the return spring 11. When the compression force of the strip column 7 disappears, the sliding pin 9 elastically returns to its original position. At the same time, an obliquely arranged rack 15 is connected to the free end of the round rod 12. The rack 15 meshes with a cylindrical gear 14. A locking member 16 is radially fixed to the gear shaft of the cylindrical gear 14. The locking member 16 may have a pointed tip. When the sliding pin 9 is fully retracted into the control cavity 10, the locking member 16 rotates into the locking groove on the slide rod 22 to prevent the slide rod 22 and the valve core 18 from moving in the direction of opening the valve 5, thereby preventing the valve 5 from being opened accidentally.

[0027] Furthermore, regarding the pressure preset of the constant pressure chamber 2 and the setting direction of the strip column 7, a design logic needs special explanation: Since the opening and closing of valve 5 and the nitrogen flow regulation generated during the opening and closing process are both designed and manufactured based on the principle that the corresponding components move due to pressure difference, the trigger condition is the amount of nitrogen in the oven, i.e., the nitrogen pressure value generated therefrom. Since the nitrogen filling chamber can actually be connected to both the air inlet pipe 23 (connected to the nitrogen source) at the inlet of valve 5 and the constant pressure chamber 2, it is necessary to ensure that when the nitrogen source is output, the nitrogen pressure cannot push the valve core 18 to the position exposed at the outlet pipe 24. Otherwise, the control of the opening and closing of valve 5 by relying on the pressure difference between the constant pressure chamber 2 and the nitrogen filling chamber in the oven may fail. That is, the strip column 7 does not slide back to squeeze the sliding pin 9, and the valve core 18 has already been opened by the nitrogen input from the air inlet pipe 23. Then, the function of automatically opening the valve core 18 to replenish nitrogen when there is insufficient nitrogen in the nitrogen filling chamber is lost, and the automatic replenishment function fails. To overcome this problem, the pressure at which nitrogen is introduced into the inlet pipe 23 must be sufficiently low, the lower the better, but it must not be lower than the pressure required for the nitrogen filling chamber; otherwise, nitrogen delivery will also be impossible. Therefore, the optimal nitrogen source pressure is equal to the pressure generated by the nitrogen filling chamber's required nitrogen volume. However, if the pressure in the constant pressure chamber 2 is directly equal to the pressure of the oven's nitrogen filling volume to determine if the nitrogen volume is sufficient, then designing the elastic force of the conical spring 20 and the return spring 11 becomes difficult and prone to errors. Currently, the valve core 18 is mistakenly pushed open, and the aforementioned sliding pin 9 has not moved vertically down to the position where the sliding pin 9 springs into the strip channel 6. At this time, the vertical sliding setting of the strip column 7 plays a crucial role. When vertically set, the downward force on the strip column 7 is equal to the sum of the pressure in the nitrogen filling chamber and the weight of the strip column 7 itself. Correspondingly, the pressure of the constant pressure chamber 2 must be equal to this sum, so that the pre-pressurized pressure of the constant pressure chamber 2 can be greater than the nitrogen source pressure. This allows for better selection and design of components such as springs, and makes it less likely that the strip column 7 will not move down to the correct position while the valve 5 has already been opened by nitrogen.

[0028] To better achieve the control of valve 5 by sliding pin 9, such as Figure 2 The end of the sliding pin 9 that can extend into the strip channel 6 is an arc surface, and the upper surface 901 of the arc surface is a sphere with a radius r equal to the radius of the sliding pin 9, and the lower surface 902 of the arc surface is a sphere with its center above the sliding pin 9 and a radius R greater than the radius of the sliding pin 9; the bottom of the strip column 7 is a conical surface, and the top side facing the control cavity 10 is a chamfered slope 701. Figure 1In this embodiment, the limiting member 8 is a ring, which is coaxially fixed inside the strip channel 6. The top of the strip column 7 has a plane 702 that connects to the chamfered surface 701. The plane 702 faces the end face of the ring for stable contact. In addition, a baffle 13 is fixed to the side wall of the sliding pin 9 near the end of the round rod 12. The baffle 13 can abut against one of the side walls of the control cavity 10. When abutting, the sliding pin 9 extends to its limit position outside the control cavity 10, and at this time, the chamfered surface 701 contacts the lower curved surface 902, so that the strip column 7 can better cooperate with the movement of the sliding pin 9.

[0029] It should be noted that, in this document, 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.

[0030] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-saving controller for an oxygen-free drying oven, characterized in that: Includes a main body (1) and a valve (5) for injecting nitrogen into the nitrogen filling chamber of the oven; A constant pressure chamber (2) pre-filled with inert gas is provided inside the main body (1). The pressure of the constant pressure chamber (2) is greater than the rated pressure of the nitrogen filling chamber in the oven. The constant pressure chamber (2) is connected to the bottom end of a vertically arranged strip channel (6). A strip column (7) is vertically and slidably provided inside the strip channel (6). A limiting member (8) is installed at the top end of the strip channel (6) to prevent the strip column (7) from sliding upward. The port is also connected to a chamber (3), which is connected to the nitrogen filling chamber inside the oven through a long and thin insulated pipe. When the pressure of the nitrogen filling chamber is at the rated pressure, the strip column (7) slides down to the bottom of the strip channel (6) under the combined action of nitrogen pressure and its own weight. At this time, the valve (5) does not inject nitrogen into the nitrogen filling chamber. When the strip column (7) moves up to contact the limiting member (8), the valve (5) opens and injects nitrogen into the nitrogen filling chamber. The strip column (7) controls the valve (5) to inject nitrogen into the nitrogen filling chamber via a sliding pin (9). The sliding pin (9) is slidably installed in the control chamber (10) of the body (1). When the strip column (7) moves upward and contacts the limiting member (8), the sliding pin (9) can be squeezed by the strip column (7) and retracted into the control chamber (10), causing the valve (5) to open. Conversely, if the strip column (7) moves downward and causes the end of the sliding pin (9) to extend into the strip channel (6), the valve (5) will be closed. The valve (5) includes a valve hole, a valve core (18), a conical spring (20), and a slide rod (22). The valve hole is horizontally arranged inside the body (1). The valve hole includes a narrow hole (17) at the inlet and a wide hole (19) at the outlet. The narrow hole (17) and the wide hole (19) are coaxially integrally formed. An outlet pipe (24) communicating with the nitrogen filling chamber is provided on the hole wall at the connection between the wide hole (19) and the narrow hole (17). An inlet pipe (23) connected to the nitrogen source is provided in the narrow hole (17). The valve core (18) is fixedly connected to the slide rod (22) at one end of the wide hole (19). The slide rod (22) is axially slidably mounted on the bushing (21) inside the wide hole (19). The bushing (21) and the valve core (18) are elastically connected by the conical spring (20) sleeved on the slide rod (22). The valve core (18) squeezes the conical spring (20) to connect the air inlet pipe (23) and the air outlet pipe (24) only when the sliding pin (9) retracts into the control chamber (10); The valve core (18) includes two oppositely arranged conical parts, the bottom ends of the two conical parts are coaxially aligned and integrally formed, and the conical surface of the conical part facing the air intake pipe (23) is sealed to the conical wall at the junction of the narrow hole (17) and the wide hole (19); The sliding pin (9) is installed obliquely and slidably inside the body (1). The axis of the sliding pin (9) forms an acute angle with the axis of the valve hole. The sliding pin (9) is elastically installed in the control cavity (10) by a return spring (11). A round rod (12) is fixed to the lower end of the sliding pin (9). The return spring (11) is sleeved on the round rod (12). When the sliding pin (9) retracts into the control cavity (10), it squeezes the return spring (11). The free end of the round rod (12) is connected to an inclined rack (15), which meshes with a cylindrical gear (14). A locking member (16) is also radially fixed to the gear shaft of the cylindrical gear (14). When the sliding pin (9) is fully retracted into the control cavity (10), the locking member (16) rotates into the locking groove on the slide rod (22) to prevent the slide rod (22) and the valve core (18) from moving in the direction of opening the valve (5).

2. The gas-saving controller for an oxygen-free drying oven according to claim 1, characterized in that: The end of the sliding pin (9) that can extend into the strip channel (6) is an arc surface, and the upper surface (901) of the arc surface is a sphere with a radius equal to the radius of the sliding pin (9), and the lower surface (902) of the arc surface is a sphere with its center above the sliding pin (9) and a radius greater than the radius of the sliding pin (9); the bottom of the strip column (7) is a conical surface, and the top side facing the control cavity (10) is a chamfered slope (701).

3. The oxygen-free oven gas-saving controller according to claim 2, characterized in that: The limiting member (8) is a ring, which is coaxially fixed in the strip channel (6). The top of the strip column (7) has a plane (702) connected to the chamfered surface (701), and the plane (702) is directly opposite the end face of the ring.

4. The oxygen-free oven gas-saving controller according to claim 2, characterized in that: A baffle (13) is also fixed to the side wall of the sliding pin (9) near the round rod (12). The baffle (13) can abut against one of the side walls of the control cavity (10). When abutting, the sliding pin (9) extends to the limit position outside the control cavity (10), and at this time the chamfered bevel (701) contacts the lower curved surface (902).

5. The gas-saving controller for an oxygen-free drying oven according to claim 1, characterized in that: The constant pressure chamber (2) and the narrow hole (17) are separated by a partition (25), and the two are arranged coaxially.

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