An experimental device and method for regulating gas negative pressure

Abstract

The present invention relates to the technical field of negative pressure regulation, and specifically relates to an experimental device and method for regulating the negative pressure of gas, including an experimental system, a buffer tank, a pressure regulating valve, and a micro vacuum pump. One end of the experimental system is connected to the buffer tank, a piston is installed inside the buffer tank, and the piston rod of the piston passes through the other end of the buffer tank and is connected to the air outlet chamber of the pressure regulating valve through a gas pipeline. The air inlet chamber of the pressure regulating valve is connected to the micro vacuum pump. Inside the pressure regulating valve, from top to bottom, there are a vacuum chamber, an atmosphere chamber, a ventilation chamber, an air outlet chamber, and an air inlet chamber. The vacuum chamber, the atmosphere chamber, and the ventilation chamber are connected and communicated, the ventilation chamber is connected and communicated with the top of the air outlet chamber, and the air inlet chamber is connected and communicated with the bottom of the air outlet chamber. The beneficial effect is that by reasonably setting and controlling the negative pressure of the gas and keeping the gas in the experimental system isolated from the atmosphere, it helps the test system meet the experimental requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of negative pressure regulation, and particularly relates to an experimental device and method for regulating the negative pressure of gas. Background Art

[0002] Due to the existence of the gas compression characteristic, experimental equipment involving negative pressure regulation and flow control often has a lag problem. Therefore, an experimental device that can achieve automatic negative pressure regulation and ensure the purity of the gas in the pipeline has become an urgent need. During the operation of the existing negative pressure device, a fixed value cannot be set, and manual adjustment of the valve is required throughout the process. Otherwise, the pressure in the gas pipeline of the test system will reach the limit value of the negative pressure device, resulting in problems such as inability to achieve automatic regulation, low test efficiency, high energy consumption of the experimental device, and inaccurate experimental results.

[0003] Currently, the principle of most negative pressure devices for controlling the vacuum degree is to allow the atmosphere to enter the pressure regulating device, resulting in a decrease in the vacuum degree of the air inlet chamber of the negative pressure device to reach the set negative pressure value. These devices often have problems with poor airtightness, resulting in large experimental errors. Since the experimental process is doped with air, the purity of the experimental gas cannot be guaranteed, thereby increasing the limitations of the experiment.

[0004] The problem of negative pressure regulation hysteresis leads to an increase in control difficulty and it is difficult to stabilize a fixed value; the mixing of the atmosphere into the test system results in inaccurate experimental results and serious airtightness problems. To solve the above two problems, corresponding supporting technical equipment needs to be developed. Summary of the Invention

[0005] The purpose of the present invention is to provide an experimental device and method for regulating the negative pressure of gas in view of the deficiencies in the prior art. By reasonably setting and controlling the negative pressure of the gas and keeping the gas in the experimental system isolated from the atmosphere, the test system is assisted to meet the experimental requirements.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0007] An experimental device and method for regulating the negative pressure of gas, characterized in that: it includes an experimental system 1, a buffer tank 2, a pressure regulating valve 13, and a micro vacuum pump 14. One end of the experimental system 1 is connected to the buffer tank 2. A piston 3 is installed inside the buffer tank 2. The piston rod of the piston 3 passes through the other end of the buffer tank 2 and is connected to the air outlet chamber 10 of the pressure regulating valve 13 through a gas pipeline. The air inlet chamber 11 of the pressure regulating valve 13 is connected to the micro vacuum pump 14.

[0008] Inside the pressure regulating valve 13, from top to bottom, there are a vacuum chamber 5, an atmosphere chamber 8, a ventilation chamber 15, an air outlet chamber 10, and an air inlet chamber 11 in sequence. The vacuum chamber 5, the atmosphere chamber 8, and the ventilation chamber 15 are connected and communicated. The ventilation chamber 15 is connected and communicated with the top of the air outlet chamber 10. The air inlet chamber 11 is connected and communicated with the bottom of the air outlet chamber 10.

[0009] A spring 7 is installed inside the vacuum chamber 5. A knob 6 is installed at the top of the spring 7. The knob 6 extends out of the top of the pressure regulating valve 13. A diaphragm 4 is installed inside the atmosphere chamber 8. The diaphragm 4 divides the connected vacuum chamber 5, atmosphere chamber 8 and ventilation chamber 15 into upper and lower parts.

[0010] An atmosphere intake valve core 9 is installed at the connection between the atmosphere chamber 8 and the ventilation chamber 15. The lower end of the atmosphere intake valve core 9 enters the air outlet chamber 10 and is placed at the connection between the air outlet chamber 10 and the air inlet chamber 11.

[0011] A first air inlet hole 1001 is opened at the top of the air outlet chamber 10. The first air inlet hole 1001 is communicated with the ventilation chamber 15. A second air inlet hole 1002 is opened at the bottom of the air outlet chamber 10. The second air inlet hole 1002 is communicated with the air inlet chamber 11.

[0012] The atmosphere intake valve core 9 is composed of a ball core 901, a rod core 902 and a plug core 903. The upper end of the rod core 902 is connected with the ball core 901. The lower end of the rod core 902 is connected with the plug core 903. The ball core 901, the rod core 902 and the plug core 903 are of an integral structure. The lower end of the rod core 902 is inserted into the first air inlet hole 1001 and then passes through the second air inlet hole 1002, so that the plug core 903 blocks the second air inlet hole 1002 from below.

[0013] An experimental method for regulating gas negative pressure is characterized by including the following steps:

[0014] When the negative pressure value at the air outlet chamber 10 is lower than the set value, the knob 6 on the pressure regulating valve 13 should be rotated clockwise. At this time, the force at the spring 7 is unbalanced with the negative pressure at the air outlet chamber 10. The force on the spring 7 causes the diaphragm 4 to move downward, prompting the atmosphere intake valve core 9 to move downward, so that the ball core 901 closes the first air inlet hole 1001. At the same time, the rod core 902 and the plug core 903 move downward to open the second air inlet hole 1002, enabling the air outlet chamber 10 to be connected with the air inlet chamber 11. Under the action of the micro negative pressure pump 14, when the force of the spring 7 is balanced with the force of the air outlet chamber 10, the vacuum value at the air outlet chamber 10 reaches the set negative pressure value;

[0015] When the negative pressure value of the air outlet chamber 10 is higher than the set value, it is set that the downward force of the spring 7 is unbalanced with the pressure of the air outlet chamber 10, resulting in the diaphragm 4 moving upward. Further, the atmosphere intake valve core 9 moves upward, so that the ball core 901 opens the first air inlet hole 1001, enabling the air outlet chamber 10, the ventilation chamber 15 and the atmosphere chamber 8 to be connected, allowing the atmosphere to flow into the air outlet chamber 10 to balance it. At the same time, the rod core 902 and the plug core 903 move upward to close the second air inlet hole 1002.

[0016] Compared with the prior art, the present invention has the following advantages: By reasonably setting and controlling the gas negative pressure and keeping the gas in the experimental system isolated from the atmosphere, the experimental system is assisted to meet the experimental requirements; at the same time, the piston 3 isolates the experimental gas from the gas at the other end of the piston 3, and does not mix air while reaching the experimental negative pressure value, which can not only ensure the purity of the experimental gas, but also meet other experimental requirements, such as measuring the content of the experimental gas, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To understand the present invention more clearly, the present disclosure will be further introduced by combining the accompanying drawings of the specification with the schematic embodiments. The drawings and embodiments are used for explanation and do not constitute a limitation to the disclosure.

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic structural diagram of the pressure regulating valve in the present invention.

[0020] As shown in the figure: experimental system 1, buffer tank 2, piston 3, diaphragm 4, vacuum chamber 5, knob 6, spring 7, atmosphere chamber 8, atmosphere intake valve core 9, air outlet chamber 10, air inlet chamber 11, pressure regulating valve 13, micro vacuum pump 14, micro vacuum pump 14, ventilation chamber 15, ball core 901, rod core 902, plug core 903, first air inlet hole 1001, second air inlet hole 1002. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0023] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] Embodiment 1

[0025] An experimental device and method for regulating gas negative pressure, characterized in that: it includes an experimental system 1, a buffer tank 2, a pressure regulating valve 13 and a micro vacuum pump 14. One end of the experimental system 1 is connected to the buffer tank 2. A piston 3 is installed inside the buffer tank 2. The piston rod of the piston 3 passes through the other end of the buffer tank 2 and is connected to the air outlet chamber 10 of the pressure regulating valve 13 through a gas pipeline. The air inlet chamber 11 of the pressure regulating valve 13 is connected to a micro vacuum pump 14.

[0026] Inside the pressure regulating valve 13, from top to bottom, there are a vacuum chamber 5, an atmosphere chamber 8, a ventilation chamber 15, an air outlet chamber 10 and an air inlet chamber 11 in sequence. The vacuum chamber 5, the atmosphere chamber 8 and the ventilation chamber 15 are connected and communicate with each other. The ventilation chamber 15 is connected to the top of the air outlet chamber 10, and the air inlet chamber 11 is connected to the bottom of the air outlet chamber 10.

[0027] A spring 7 is installed inside the vacuum chamber 5. A knob 6 is installed at the top of the spring 7. The knob 6 extends out of the top of the pressure regulating valve 13. A diaphragm 4 is installed inside the atmosphere chamber 8. The diaphragm 4 divides the connected vacuum chamber 5, atmosphere chamber 8 and ventilation chamber 15 into upper and lower parts.

[0028] An atmosphere suction valve core 9 is installed at the connection between the atmosphere chamber 8 and the ventilation chamber 15. The lower end of the atmosphere suction valve core 9 enters the air outlet chamber 10 and is placed at the connection between the air outlet chamber 10 and the air inlet chamber 11.

[0029] A first air inlet hole 1001 is opened at the top of the air outlet chamber 10. The first air inlet hole 1001 is connected to the ventilation chamber 15. A second air inlet hole 1002 is opened at the bottom of the air outlet chamber 10. The second air inlet hole 1002 is connected to the air inlet chamber 11.

[0030] The atmosphere suction valve core 9 is composed of a ball core 901, a rod core 902 and a plug core 903. The upper end of the rod core 902 is connected to the ball core 901. The lower end of the rod core 902 is connected to the plug core 903. The ball core 901, the rod core 902 and the plug core 903 are an integral structure. The lower end of the rod core 902 is inserted into the first air inlet hole 1001 and then passes through the second air inlet hole 1002, so that the plug core 903 blocks the second air inlet hole 1002 from below.

[0031] Example 2

[0032] In the working process of the present invention:

[0033] When the negative pressure value at the air outlet chamber 10 is lower than the set value, the knob 6 on the pressure regulating valve 13 should be rotated clockwise. At this time, the force at the spring 7 is unbalanced with the negative pressure at the air outlet chamber 10. The force on the spring 7 causes the diaphragm 4 to move downward, prompting the atmospheric air to be inhaled and the valve core 9 to move downward, causing the ball core 901 to close the first air inlet hole 1001. At the same time, the rod core 902 and the plug core 903 move downward to open the second air inlet hole 1002, enabling the air outlet chamber 10 to communicate with the air inlet chamber 11. Under the action of the micro negative pressure pump 14, when the force of the spring 7 is balanced with the force at the air outlet chamber 10, the vacuum value at the air outlet chamber 10 reaches the set negative pressure value.

[0034] When the negative pressure value at the air outlet chamber 10 is higher than the set value, it is set that the downward force of the spring 7 is unbalanced with the pressure at the air outlet chamber 10, causing the diaphragm 4 to move upward. Then, the atmospheric air is inhaled and the valve core 9 moves upward, causing the ball core 901 to open the first air inlet hole 1001, enabling the air outlet chamber 10, the air vent chamber 15, and the atmosphere chamber 8 to communicate with each other, allowing the atmospheric air to flow into the air outlet chamber 10 to balance it. At the same time, the rod core 902 and the plug core 903 move upward to close the second air inlet hole 1002.

[0035] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An experimental device for regulating the negative pressure of gas, characterized in that: It includes an experimental system (1), a buffer tank (2), a pressure regulating valve (13) and a micro vacuum pump (14). One end of the experimental system (1) is connected to the buffer tank (2). A piston (3) is installed inside the buffer tank (2). The piston rod of the piston (3) passes through one end of the buffer tank (2) and is connected to the air outlet chamber (10) of the pressure regulating valve (13) through a gas pipeline. The air inlet chamber (11) of the pressure regulating valve (13) is connected to the micro vacuum pump (14). It is characterized in that: Inside the pressure regulating valve (13), from top to bottom, there are a vacuum chamber (5), an atmosphere chamber (8), a ventilation chamber (15), an air outlet chamber (10) and an air inlet chamber (11) in sequence. The vacuum chamber (5), the atmosphere chamber (8) and the ventilation chamber (15) are connected and communicate with each other. The ventilation chamber (15) is connected and communicates with the top of the air outlet chamber (10). The air inlet chamber (11) is connected and communicates with the bottom of the air outlet chamber (10). A spring (7) is installed inside the vacuum chamber (5). A knob (6) is installed at the top of the spring (7). The knob (6) extends out of the top of the pressure regulating valve (13). A diaphragm (4) is installed inside the atmosphere chamber (8). The diaphragm (4) divides the connected vacuum chamber (5), atmosphere chamber (8) and ventilation chamber (15) into upper and lower parts. An atmosphere intake valve core (9) is installed at the connection between the atmosphere chamber (8) and the ventilation chamber (15). The lower end of the atmosphere intake valve core (9) enters the air outlet chamber (10) and is placed at the connection between the air outlet chamber (10) and the air inlet chamber (11). A first air inlet hole (1001) is opened at the top of the air outlet chamber (10). The first air inlet hole (1001) is connected and communicates with the ventilation chamber (15). A second air inlet hole (1002) is opened at the bottom of the air outlet chamber (10). The second air inlet hole (1002) is connected and communicates with the air inlet chamber (11). The atmosphere intake valve core (9) is composed of a ball core (901), a rod core (902) and a plug core (903). The upper end of the rod core (902) is connected to the ball core (901). The lower end of the rod core (902) is connected to the plug core (903). The ball core (901), the rod core (902) and the plug core (903) are of an integral structure. The lower end of the rod core (902) is inserted into the first air inlet hole (1001) and then passes out through the second air inlet hole (1002), so that the plug core (903) blocks the second air inlet hole (1002) from below.

2. An experimental method for the experimental device for regulating the negative pressure of gas as described in claim 1, characterized in that, it includes the following steps: When the negative pressure value at the air outlet chamber (10) is lower than the set value, the knob (6) on the pressure regulating valve (13) should be rotated clockwise. At this time, the force at the spring (7) is unbalanced with the negative pressure at the air outlet chamber (10). The force on the spring (7) causes the diaphragm (4) to move downward, prompting the atmospheric air to be inhaled and the valve core (9) to move downward, causing the ball core (901) to close the first air inlet hole (1001). At the same time, the rod core (902) and the plug core (903) move downward to open the second air inlet hole (1002), enabling the air outlet chamber (10) to communicate with the air inlet chamber (11). Under the action of the micro vacuum pump (14), when the force of the spring (7) is balanced with the air outlet chamber (10), the vacuum value at the air outlet chamber (10) reaches the set negative pressure value; When the negative pressure value at the air outlet chamber (10) is higher than the set value, it is set that the downward force of the spring (7) is unbalanced with the pressure at the air outlet chamber (10), resulting in the diaphragm (4) moving upward. Subsequently, the atmospheric air is inhaled and the valve core (9) moves upward, causing the ball core (901) to open the first air inlet hole (1001), enabling the air outlet chamber (10), the air vent chamber (15), and the atmosphere chamber (8) to communicate with each other, allowing the atmospheric air to flow into the air outlet chamber (10) to balance it. At the same time, the rod core (902) and the plug core (903) move upward to close the second air inlet hole (1002).

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