Gas replacement type capillary tube vacuumizing device

Abstract

The utility model relates to the technical field of pressure transmitter manufacturing, in particular to a gas replacement type capillary tube vacuumizing device which comprises a three-way gas pipe, the right side of the three-way gas pipe is connected with a first gas pipe, the first gas pipe is sequentially provided with a one-way valve and a gas pump from left to right, and the upper portion of the three-way gas pipe is connected with a second gas pipe. A nitrogen storage chamber is arranged at an upper port of the second gas pipe, a gas return pipe is arranged between a gas inlet of the nitrogen storage chamber and a gas outlet of the gas pump, a nitrogen separation box is arranged on the gas return pipe, a third gas pipe is connected to the left side of the three-way gas pipe, and a capillary pipe connector is arranged at a left port of the third gas pipe. An infrared temperature measuring lamp is arranged on the left side of the capillary tube connector and right faces the capillary tube connector. According to the utility model, the capillary tube is vacuumized, then nitrogen is introduced, and the gas return pipe, the nitrogen separation box and the infrared temperature measuring lamp are arranged, so that the measurement precision of the capillary tube is improved, and the operation is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure transmitter manufacturing, in particular to a gas replacement capillary vacuum pumping device. Background Art

[0002] During the manufacture and use of pressure transmitters, gas inside the capillary tube can affect measurement accuracy. To achieve higher measurement accuracy, the capillary tube must be vacuumed. However, traditional vacuuming methods are often complex and costly. Therefore, developing a capillary vacuuming device for the remote sealing assembly of a gas displacement pressure transmitter has significant practical value. Utility Model Content

[0003] The purpose of the utility model is to provide a gas displacement capillary vacuum pumping device, which solves the problems raised in the above background technology by pumping nitrogen into the capillary into a vacuum state, installing a gas reflux pipe, a nitrogen separation box and an infrared temperature measuring lamp.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A gas displacement capillary vacuum pumping device, comprising a three-way vent pipe, a first vent pipe connected to the right side of the three-way vent pipe, the first vent pipe being provided with a one-way valve and an air pump in sequence from left to right, a second vent pipe connected above the three-way vent pipe, a nitrogen storage chamber provided at the upper end of the second vent pipe, a return air pipe provided between the air inlet of the nitrogen storage chamber and the air outlet of the air pump, and a nitrogen separation box provided on the return air pipe;

[0006] The left side of the three-way air pipe is connected to a third air pipe, a capillary interface is provided at the left port of the third air pipe, an infrared temperature measuring lamp is provided on the left side of the capillary interface, and the infrared temperature measuring lamp is facing the capillary interface.

[0007] As a preferred solution, the nitrogen separation box is provided with a filter screen, an activated carbon layer and a nitrogen separation membrane in sequence from bottom to top.

[0008] As a preferred solution, the second gas pipe is provided with a first valve, and the first valve is arranged below the nitrogen storage chamber.

[0009] As a preferred solution, a barometer is provided above the third air pipe.

[0010] As a preferred solution, an air outlet pipe is provided on the right outer wall of the nitrogen separation box, and the air outlet of the air outlet pipe is provided on the right inner wall between the activated carbon layer and the nitrogen separation membrane in the nitrogen separation box.

[0011] As a preferred solution, an air intake pipe is provided on the left outer wall of the nitrogen separation box, an air inlet of the air intake pipe is provided on the left inner wall below the filter screen in the nitrogen separation box, and a third valve is provided on the air intake pipe.

[0012] It can be seen from the technical solution provided by the above utility model that the gas displacement capillary vacuum device provided by the utility model has the following beneficial effects:

[0013] 1. Extract the air from the capillary tube to make it in a vacuum state and then fill it with nitrogen. The vacuum state inside the capillary tube can improve the measurement accuracy of the capillary tube.

[0014] 2. An infrared temperature measuring lamp is installed next to the capillary interface, facing the capillary interface, to detect whether there is nitrogen leakage at the connection between the capillary interface and the capillary tube, ensuring the sealing of the capillary tube during the vacuum pumping process;

[0015] 3. The air extracted from the capillary is separated into nitrogen and stored in a nitrogen storage room for standby use. The utilization efficiency of the extracted air is improved by recycling and separating the nitrogen. The structure is simple and the operation is easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a gas displacement capillary vacuum pumping device of the utility model;

[0017] Figure 2 The utility model is a schematic diagram of the structure of a nitrogen separation box of a gas displacement capillary vacuum device.

[0018] In the figure: 1. three-way air pipe; 2. first air pipe; 3. one-way valve; 4. vacuum pump; 5. nitrogen storage chamber; 6. second air pipe; 7. nitrogen separation box; 8. first valve; 9. third air pipe; 10. barometer; 11. return air pipe; 12. outlet pipe; 13. inlet pipe; 14. second valve; 15. capillary interface; 16. infrared temperature lamp; 71. filter; 72. activated carbon layer; 73. nitrogen separation membrane. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0021] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, features identified with "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] like Figure 1-2 As shown, the embodiment of the utility model provides a gas displacement capillary vacuum device, including a three-way vent pipe 1, a first air pipe 2 is connected to the right side of the three-way vent pipe 1, and the first air pipe 2 is provided with a one-way valve 3 and an air pump 4 from left to right. A second air pipe 6 is connected to the top of the three-way vent pipe 1, and a nitrogen storage chamber 5 is provided at the upper port of the second air pipe 6. A return air pipe 11 is provided between the air inlet of the nitrogen storage chamber 5 and the air outlet of the air pump 4, and a nitrogen separation box 7 is provided on the return air pipe 11;

[0025] The left side of the three-way air pipe 1 is connected to the third air pipe 9 , and the left port of the third air pipe 9 is provided with a capillary interface 15 . The left side of the capillary interface 15 is provided with an infrared temperature measuring lamp 16 , and the infrared temperature measuring lamp 16 is directly facing the capillary interface 15 .

[0026] Among them, a one-way valve 3 and a vacuum pump 4 are arranged in sequence from left to right in the first air pipe 2. The vacuum pump 4 can extract the air from the capillary tube, making the capillary tube in a vacuum state. The one-way valve 3 can prevent the gas from flowing back into the capillary tube, ensuring a one-way flow of gas from left to right. The nitrogen storage chamber 5 is used to store nitrogen so that nitrogen can be supplied to the capillary tube after the capillary tube is in a vacuum state, thereby improving the measurement accuracy of the capillary tube. The capillary tube interface 15 is used to connect the capillary tube. An infrared temperature measuring lamp 16 is arranged on the left side of the capillary tube interface 15. The infrared temperature measuring lamp 16 can detect whether the interface between the capillary tube interface 15 and the capillary tube is tightly connected, which can immediately detect any air leaks and solve the problem in a timely manner. The gas reflux pipe 11 can separate the gas extracted from the capillary tube by the vacuum pump 4 through the nitrogen separation box 7, and then transport it to the nitrogen storage chamber 5 for storage. By recycling and separating the nitrogen, the utilization efficiency of air is improved. The structure is simple and easy to operate.

[0027] like Figure 1 As shown, the nitrogen separation box 7 is provided with a filter screen 71, an activated carbon layer 72 and a nitrogen separation membrane 73 in sequence from bottom to top.

[0028] Among them, the filter 71 is used to separate larger impurities in the air. The filtered air passes through the filter 71 and reaches the activated carbon layer 72. The activated carbon layer 72 is used to filter moisture and smaller impurities in the air. Then the nitrogen separation membrane 73 is used to separate nitrogen in the air. By utilizing the different sizes of different molecules, nitrogen can pass through the nitrogen separation membrane 73 and flow along the gas reflux pipe 11 into the nitrogen storage chamber 5. Other gases such as oxygen cannot pass through the nitrogen separation membrane 73 and remain in the nitrogen separation box 7. After passing through the filter 71, the activated carbon layer 72 and the nitrogen separation membrane 73, a higher concentration of nitrogen can be separated.

[0029] like Figure 1 As shown, a first valve 8 is provided on the second gas pipe 6 , and the first valve 8 is provided below the nitrogen storage chamber 5 .

[0030] The first valve 8 is used to control the delivery of nitrogen and the flow rate of nitrogen.

[0031] like Figure 1 As shown, a barometer 10 is provided above the third air pipe 9 .

[0032] The barometer 10 is used to detect whether the vacuum pump 4 has evacuated the interior of the capillary to a vacuum state. When the barometer 10 indicates a vacuum state, the vacuum pump 4 is turned off.

[0033] like Figure 1As shown, an air outlet pipe 12 is provided on the right outer wall of the nitrogen separation box 7 , and the air outlet of the air outlet pipe 12 is provided on the right inner wall between the activated carbon layer 72 and the nitrogen separation membrane 73 in the nitrogen separation box 7 .

[0034] Among them, the outlet of the outlet pipe 12 is set on the right inner wall between the activated carbon layer 72 and the nitrogen separation membrane 73 in the nitrogen separation box 7, which can discharge the oxygen and other gases that cannot pass through the nitrogen separation membrane 73 out of the nitrogen separation box 73 along the outlet of the outlet pipe 12.

[0035] like Figure 1 As shown, an air intake pipe 13 is provided on the left outer wall of the nitrogen separation box 7 , an air inlet of the air intake pipe 13 is provided on the left inner wall below the filter screen 71 in the nitrogen separation box 7 , and a third valve 14 is provided on the air intake pipe 13 .

[0036] Among them, when the nitrogen separated by the gas extracted by the vacuum pump 4 cannot meet the nitrogen required by the capillary, the air is transported along the air inlet pipe 13 to the nitrogen separation box 7 for nitrogen separation to meet the nitrogen demand. The air inlet of the air inlet pipe 13 is set on the left inner wall below the filter screen 71 in the nitrogen separation box 7, which can ensure that the air entering the nitrogen separation box 7 is fully filtered to obtain nitrogen with higher purity.

[0037] The working principle of this embodiment is as follows: when the capillary needs to be vacuumed, the capillary interface 15 is connected to the capillary, the one-way valve 3 is opened, and then the vacuum pump 4 is started to extract the air in the capillary along the third air pipe 6, the three-way pipe 1 and the first air pipe 3. The extracted air follows the gas return pipe 11 and enters the nitrogen separation box 7 for nitrogen separation. The separated nitrogen enters the nitrogen storage chamber 5 along the gas return pipe 11. When the separated nitrogen is less than the nitrogen required in the capillary, the third valve 14 is opened to extract the air into the nitrogen separation box 7 for nitrogen separation. When the barometer 10 shows that the capillary is in a vacuum state, the vacuum pump 4 is turned off, the first valve 6 is opened to transport the nitrogen along the pipeline into the capillary 15. During the nitrogen transportation process, the infrared temperature measuring lamp 16 is turned on to check whether there is any leakage at the connection between the capillary interface 15 and the capillary.

[0038] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas displacement capillary vacuum pumping device, comprising a three-way air pipe (1), characterized in that: The right side of the three-way air pipe (1) is connected to a first air pipe (2), and the first air pipe (2) is provided with a one-way valve (3) and an air pump (4) in sequence from left to right. The top of the three-way air pipe (1) is connected to a second air pipe (6), and a nitrogen storage chamber (5) is provided at the upper end of the second air pipe (6). A return air pipe (11) is provided between the air inlet of the nitrogen storage chamber (5) and the air outlet of the air pump (4), and a nitrogen separation box (7) is provided on the return air pipe (11); The left side of the three-way air pipe (1) is connected to a third air pipe (9), a capillary interface (15) is provided at the left end of the third air pipe (9), an infrared temperature measuring lamp (16) is provided on the left side of the capillary interface (15), and the infrared temperature measuring lamp (16) is directly facing the capillary interface (15).

2. The gas displacement capillary vacuum pumping device according to claim 1, characterized in that: The nitrogen separation box (7) is provided with a filter screen (71), an activated carbon layer (72) and a nitrogen separation membrane (73) in sequence from bottom to top.

3. The gas displacement capillary vacuum pumping device according to claim 1, characterized in that: The second gas pipe (6) is provided with a first valve (8), and the first valve (8) is arranged below the nitrogen storage chamber (5).

4. The gas displacement capillary vacuum pumping device according to claim 1, characterized in that: A barometer (10) is provided above the third air pipe (9).

5. The gas displacement capillary vacuum pumping device according to claim 2, characterized in that: An air outlet pipe (12) is provided on the right outer wall of the nitrogen separation box (7), and an air outlet of the air outlet pipe (12) is provided on the right inner wall between the activated carbon layer (72) and the nitrogen separation membrane (73) in the nitrogen separation box (7).

6. The gas displacement capillary vacuum pumping device according to claim 5, characterized in that: An air intake pipe (13) is provided on the left outer wall of the nitrogen separation box (7), an air inlet of the air intake pipe (13) is provided on the left inner wall below the filter screen (71) in the nitrogen separation box (7), and a third valve (14) is provided on the air intake pipe (13).

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