Instrument gas standby system of high-purity nitrogen device

Abstract

The invention relates to an instrument gas backup system of a high-purity nitrogen device, and belongs to the technical field of instrument air, the instrument gas backup system comprises an instrument drying air system and an instrument nitrogen backup system, the instrument drying air system is used for conveying air, and the instrument nitrogen backup system is used for conveying nitrogen. The instrument drying air system and the instrument nitrogen backup system are connected in parallel, the system further comprises a common pipeline used for connecting the instrument drying air system and the instrument nitrogen backup system, and a supply pipeline of the instrument drying air system is provided with a check valve and a pressure regulating valve. The instrument nitrogen backup system supply pipeline is provided with a check valve and a pressure regulating valve, the check valve and the common pipeline are provided with a pressure sensor and a pressure regulating and discharging valve, and the pressure sensor is located behind the pressure regulating and discharging valve and is close to the execution element. The system has the effect of reducing the possibility of system pollution caused by air backflow.

Description

Technical Field

[0001] The present application relates to the technical field of instrument air, and in particular to an instrument air backup system for a high-purity nitrogen device. Background Art

[0002] Instrument air is an industrial gas that is processed from compressed air and then used in various industrial applications. Usually, air is compressed to a certain pressure using an air compressor, and then the air is processed through oil filters, evaporators, coolers, pressure regulators and other processing equipment to produce clean, high-quality instrument air.

[0003] Instrument air is highly stable, and the supply of instrument air can be adjusted according to actual needs. It has extremely high stability and can ensure the normal operation of the equipment. It is clean and hygienic. After being processed, the oil, water, dust and other impurities in the instrument air can be removed to ensure the cleanliness of the transmission medium. It is non-toxic, odorless and colorless. The instrument air will not pollute the environment or cause harm to the human body. It is easy to operate. The use of instrument air can avoid the inconvenient operation and management problems of some liquid media. The processing cost is low. Compared with other transmission media, the processing cost of instrument air is relatively low.

[0004] Instrument air application areas, industrial field: instrument air is widely used in various electronic industries and industrial occasions, such as industrial automation systems, pneumatic tools, pneumatic transmission, etc.; in the medical field, instrument air is widely used in medical equipment, such as electronic noses, oxygen generators, artificial respirators, etc.; in the construction field, instrument air is also widely used in space purification and intelligent control. In short, instrument air is an industrial gas widely used in various industrial occasions. It has the characteristics of high stability, cleanliness, easy operation, and low processing cost. It plays an important role in industrial control systems, pneumatic tools, medical equipment, etc.

[0005] However, the main gas source of the instrument gas of the high-purity nitrogen device comes from clean dry air, and the backup gas source comes from the high-purity nitrogen pipeline network. However, due to design and valve manufacturing reasons, air often flows back into the nitrogen system during use, causing accidents of system contamination. Summary of the invention

[0006] In order to reduce the possibility of system contamination due to air backflow, the present application provides an instrument gas backup system for a high-purity nitrogen device.

[0007] The instrument gas backup system of a high-purity nitrogen device provided in this application adopts the following technical solution: An instrument air backup system for a high-purity nitrogen device comprises an instrument dry air system and an instrument nitrogen backup system, wherein the instrument dry air system is used to transport air, and the instrument nitrogen backup system is used to transport nitrogen. The instrument dry air system and the instrument nitrogen backup system are connected in parallel, and further comprises a common pipeline for connecting the instrument dry air system and the instrument nitrogen backup system, wherein the instrument dry air system supply pipeline is provided with a check valve and a pressure regulating valve, and the instrument nitrogen backup system supply pipeline is provided with a check valve and a pressure regulating valve, wherein the check valve and the common pipeline are provided with a pressure sensor and a pressure regulating relief valve, and the pressure sensor is located behind the pressure regulating relief valve and close to an actuator.

[0008] Optionally, a pneumatic valve is provided on the supply pipeline of the instrument dry air system.

[0009] Optionally, two parallel pipelines are provided on the common pipeline, and both of the two parallel pipelines are provided with regulating valves.

[0010] Optionally, the number of regulating valves on one of the parallel pipelines is one, and the number of regulating valves on the other parallel pipeline is two.

[0011] Optionally, a final filter is provided between the two regulating valves on the parallel pipeline, and the filter element of the final filter is polytetrafluoroethylene.

[0012] Optionally, a reducer is provided in the instrument nitrogen backup system supply pipeline, the reducer is conical in shape with the tip facing the air inlet end, the reducer is used to reduce the flow diameter of nitrogen in the instrument nitrogen backup system supply pipeline, and a spiral groove is provided on the inner wall of the instrument nitrogen backup system supply pipeline, the starting end of the spiral groove corresponds to the reducer, and the spiral groove extends toward the common pipeline.

[0013] Optionally, the reducer includes a mounting rod in the instrument nitrogen backup system supply pipeline and an umbrella-shaped frame arranged on the mounting rod, the umbrella-shaped frame is covered with elastic cloth, and the mounting is provided with an unfolding member, the unfolding member is used to drive the umbrella-shaped frame to unfold and drive the elastic cloth to unfold.

[0014] Optionally, the umbrella-shaped skeleton includes a plurality of support rods arranged on a mounting rod, the plurality of support rods are evenly arranged along the circumference of the mounting rod and hinged to the mounting rod, a mounting ring is slidably sleeved on the mounting rod, the mounting ring is provided with oblique rods corresponding one to one with the support rods, two ends of the oblique rods are respectively hinged to the mounting ring and the support rod, and the unfolding member is used to drive the mounting ring to slide along the mounting rod.

[0015] Optionally, the unfolding member includes a micro motor and a lead screw rotatably disposed on a mounting rod, the lead screw is coaxially disposed on an output shaft of the micro motor, and the mounting ring is threadedly connected to the lead screw.

[0016] Optionally, a conical block is provided at the end of the mounting rod, and the bottom diameter of the conical block is larger than the diameter of the mounting rod.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: 1. Under the action of the check valve and the pressure regulating valve, the possibility of air entering the nitrogen pipeline due to high pressure in the air pipeline and causing system contamination risk when the system fails is reduced; and it can ensure that when the device jumps and other reasons occur, the instrument air can still be supplied by the backup nitrogen after losing the gas source, ensuring the reliability of the system; and when the regulating valve fails, the valve can be isolated and replaced without disturbance to ensure the normal and reliable online pressure of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a gas delivery schematic diagram of an instrument gas backup system of a high-purity nitrogen device according to an embodiment of the present application; Figure 2 It is a schematic diagram of a supply pipeline of an instrument nitrogen backup system in an instrument gas backup system of a high-purity nitrogen device in an embodiment of the present application; Figure 3 It is a cross-sectional view of a supply pipeline of an instrument nitrogen backup system in an instrument gas backup system of a high-purity nitrogen device according to an embodiment of the present application; Figure 4 It is a schematic diagram of the structure of a reducer in an instrument gas backup system of a high-purity nitrogen device according to an embodiment of the present application.

[0019] Description of reference numerals: 1. Instrument dry air system; 2. Instrument nitrogen backup system; 3. Common pipeline; 4. Check valve; 5. Pressure regulating valve; 6. Pressure sensor; 7. Pneumatic valve; 8. Parallel pipeline; 9. Regulating valve; 10. Final filter; 11. Reducer; 111. Mounting rod; 112. Support rod; 113. Elastic cloth; 114. Mounting ring; 115. Slant rod; 116. Micro motor; 117. Lead screw; 12. Spiral groove; 13. Accommodating groove; 14. Conical block. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4 This application is described in further detail.

[0021] The present application embodiment discloses an instrument gas backup system for a high purity nitrogen device. Figure 1The instrument air backup system of the high-purity nitrogen device includes an instrument dry air system 1 and an instrument nitrogen backup system 2, wherein the instrument dry air system 1 is used to transport air, and the instrument nitrogen backup system 2 is used to transport nitrogen. The instrument dry air system 1 and the instrument nitrogen backup system 2 are connected in parallel, and also include a common pipeline 3 for connecting the instrument dry air system 1 and the instrument nitrogen backup system 2; Reference Figure 1 The instrument dry air system supply pipeline is provided with a check valve 4 and a pressure regulating valve 5, and the instrument nitrogen backup system supply pipeline is provided with a check valve 4 and a pressure regulating valve 5. The check valve 4 common pipeline 3 is provided with a pressure sensor 6 and a pressure regulating relief valve. The pressure sensor 6 is located behind the pressure regulating relief valve and close to the actuator. Under the action of the check valve 4 and the pressure regulating valve 5, the possibility of air entering the nitrogen pipeline due to high pressure in the air pipeline and causing system contamination risk when the system fails is reduced; and it can be ensured that the backup nitrogen can still be supplied after the instrument air loses its gas source due to reasons such as the device jumping, so as to ensure the reliability of the system.

[0022] Reference Figure 1 A pneumatic valve 7 is provided on the supply pipeline of the instrument dry air system. When a failure occurs in the instrument dry air system 1, the pneumatic valve 7 opens, and the supply pipeline of the instrument nitrogen backup system transports nitrogen to the common pipeline 3 and then to the actuator, thereby ensuring the reliable operation of the system.

[0023] Reference Figure 1 Furthermore, two parallel pipelines 8 are provided on the common pipeline 3, and both parallel pipelines 8 are provided with regulating valves 9; under the action of the regulating valves 9, when the parallel pipelines 8 are damaged, the regulating valves 9 can be isolated and replaced without disturbance to ensure that the system online pressure is normal and reliable; further, in the embodiment of the present application, the number of regulating valves 9 on one parallel pipeline 8 is one, and the number of regulating valves 9 on the other parallel pipeline 8 is two.

[0024] Reference Figure 1 To ensure the cleanliness of the supplied gas, a final filter 10 is provided between the two regulating valves 9 on the parallel pipeline 8. The filter element of the final filter 10 is made of polytetrafluoroethylene, and the filter pore diameter of the filter element of the final filter 10 is 5 microns. Before the supplied gas enters the actuator, it is filtered through the final filter 10 to filter out impurities carried in the gas, thereby ensuring the cleanliness of the supplied gas.

[0025] Reference Figure 2 , Figure 3 and Figure 4When the supply pipeline of the instrument dry air system is damaged, the supply pipeline of the instrument nitrogen backup system needs to supply nitrogen to the actuator in time. However, during the delivery of nitrogen, due to the flow rate limitation, the delivery time of nitrogen is relatively long. Therefore, in the embodiment of the present application, a reducer 11 is provided in the supply pipeline of the instrument nitrogen backup system. The reducer 11 is cone-shaped with the tip facing the air inlet end. The reducer 11 is used to reduce the flow diameter of nitrogen in the supply pipeline of the instrument nitrogen backup system. The inner wall of the supply pipeline of the instrument nitrogen backup system is provided with a spiral groove 12. The spiral groove 1 The starting end of 2 corresponds to the reducer 11, and the spiral groove 12 extends toward the common pipeline 3; when the nitrogen passes through the instrument nitrogen backup system supply pipeline, it first passes through the reducer 11. At this time, the diameter of the reducer 11 increases and approaches the inner wall of the supply pipeline to reduce the flow diameter of the nitrogen, thereby increasing the flow rate of the nitrogen; further, when the nitrogen passes through the reducer 11, part of the nitrogen enters the spiral groove 12 and flows along the spiral groove 12. At this time, the nitrogen flows in a spiral in the supply pipeline, further increasing the flow rate of the nitrogen, thereby supplying the nitrogen to the actuator in time.

[0026] Reference Figure 2 , Figure 3 and Figure 4 In the embodiment of the present application, the reducer 11 includes a mounting rod 111 in the supply pipeline of the instrument nitrogen backup system and an umbrella-shaped frame arranged on the mounting rod 111. The length direction of the mounting rod 111 is parallel to the length direction of the supply pipeline and is coaxial with the supply pipeline. The umbrella-shaped frame is covered with an elastic cloth 113, and an unfolding member is arranged on the mounting rod. The unfolding member is used to drive the umbrella-shaped frame to unfold and drive the elastic cloth 113 to unfold; when nitrogen is supplied, the unfolding member first acts on the umbrella-shaped frame to unfold the umbrella-shaped frame, and the elastic cloth 113 is unfolded during the unfolding process of the umbrella-shaped frame, thereby reducing the flow channel of nitrogen in the supply pipeline, and the operation is simple and convenient; further, the elastic cloth 113 is made of rubber, which reduces the possibility of nitrogen passing through the elastic cloth 113.

[0027] Reference Figure 2 , Figure 3 and Figure 4In the embodiment of the present application, the umbrella-shaped skeleton includes a plurality of support rods 112 arranged on the mounting rod 111, the elastic cloth 113 is fixedly arranged on the edge of the support rod 112, the plurality of support rods 112 are evenly arranged along the circumference of the mounting rod 111 and are hinged on the mounting rod 111, the hinge axis of the support rod 112 is perpendicular to the length direction of the mounting rod 111, a mounting ring 114 is slidably sleeved on the mounting rod 111, the mounting ring 114 slides along the length direction of the mounting rod 111, an inclined rod 115 corresponding to the support rod 112 is arranged on the mounting ring 114, and the two ends of the inclined rod 115 are respectively hinged on the mounting ring 114 and the support rod 112, and the unfolding member is used to drive the mounting ring 114 to slide along the mounting rod 111; the unfolding member includes a micro motor 116 and a lead screw 117 rotatably arranged on the mounting rod 111, the lead screw 117 is coaxially arranged on the output shaft of the micro motor 116, and the mounting ring 114 is threadedly connected to the lead screw 117. When the umbrella-shaped frame is unfolded, the micro motor 116 is started, and the micro motor 116 drives the lead screw 117 to rotate. The rotation of the lead screw 117 drives the mounting ring 114 to slide along the mounting ring 114. The sliding of the mounting ring 114 drives the inclined rod 115 to rotate. The rotation of the inclined rod 115 drives the support rod 112 to rotate, and then drives the elastic cloth 113 to rotate and unfold in the supply pipeline. The operation is simple and convenient. At the same time, under the action of the threaded fixation of the lead screw 117, it is convenient to fix the mounting ring 114 in the moved position, so that the elastic cloth 113 can remain in the unfolded state.

[0028] Reference Figure 2 , Figure 3 and Figure 4 Furthermore, a receiving groove 13 is provided on the mounting rod 111 , the lead screw 117 and the micro motor 116 are both located in the receiving groove 13 , and a slider is integrally formed on the inner ring of the mounting ring 114 , and the slider is threadedly connected to the lead screw 117 .

[0029] Reference Figure 2 , Figure 3 and Figure 4 In order to reduce the degree of obstruction of the mounting rod 111 to the nitrogen delivery, a conical block 14 is provided at the end of the mounting rod 111, and the bottom diameter of the conical block 14 is larger than the diameter of the mounting rod 111; under the action of the conical block 14, the nitrogen is guided, thereby reducing the degree of obstruction of the mounting rod 111 to the nitrogen delivery.

[0030] The implementation principle of the instrument gas backup system of a high-purity nitrogen device in the embodiment of the present application is: Under the action of the check valve 4 and the pressure regulating valve 5, the possibility of air entering the nitrogen pipeline due to high pressure in the air pipeline and causing system contamination risk when the system fails is reduced; and it can be ensured that when the device jumps, the instrument air can still be supplied by the backup nitrogen after losing the gas source, thereby ensuring the reliability of the system; when the nitrogen passes through the instrument nitrogen backup system supply pipeline, it first passes through the umbrella-shaped skeleton. At this time, the diameter of the umbrella-shaped skeleton increases and approaches the inner wall of the supply pipeline to reduce the flow diameter of the nitrogen, thereby increasing the flow rate of the nitrogen; further, when the nitrogen passes through the umbrella-shaped skeleton, part of the nitrogen enters the spiral groove 12 and flows along the spiral groove 12. At this time, the nitrogen flows in a spiral in the supply pipeline, further increasing the flow rate of the nitrogen, thereby supplying nitrogen to the actuator in time.

[0031] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An instrument gas backup system for a high purity nitrogen device, characterized in that: The invention comprises an instrument dry air system (1) and an instrument nitrogen backup system (2), wherein the instrument dry air system (1) is used to transport air, and the instrument nitrogen backup system (2) is used to transport nitrogen. The instrument dry air system (1) and the instrument nitrogen backup system (2) are connected in parallel, and further comprises a common pipeline (3) for connecting the instrument dry air system (1) and the instrument nitrogen backup system (2). The supply pipeline of the instrument dry air system (1) is provided with a check valve (4) and a pressure regulating valve (5), and the supply pipeline of the instrument nitrogen backup system (2) is provided with a check valve (4) and a pressure regulating valve (5). The check valve (4) and the common pipeline (3) are provided with a pressure sensor (6) and a pressure regulating relief valve, and the pressure sensor (6) is located behind the pressure regulating relief valve and close to the actuator.

2. The instrument gas backup system of a high purity nitrogen device according to claim 1, characterized in that: A pneumatic valve (7) is provided on the supply pipeline of the instrument dry air system (1).

3. The instrument gas backup system of a high purity nitrogen device according to claim 1, characterized in that: Two parallel pipelines (8) are arranged on the common pipeline (3), and both of the two parallel pipelines (8) are provided with regulating valves (9).

4. The instrument gas backup system of a high purity nitrogen device according to claim 3, characterized in that: The number of the regulating valves (9) on one of the parallel pipelines (8) is one, and the number of the regulating valves (9) on the other of the parallel pipelines (8) is two.

5. The instrument gas backup system of a high purity nitrogen device according to claim 4, characterized in that: A final filter (10) is arranged between the two regulating valves (9) on the parallel pipeline (8), and the filter element of the final filter (10) is made of polytetrafluoroethylene.

6. The instrument gas backup system of a high purity nitrogen device according to claim 1, characterized in that: A reducer (11) is arranged in the supply pipeline of the instrument nitrogen backup system (2). The reducer (11) is in a cone shape with the tip facing the air inlet end. The reducer (11) is used to reduce the flow diameter of nitrogen in the supply pipeline of the instrument nitrogen backup system (2). A spiral groove (12) is provided on the inner wall of the supply pipeline of the instrument nitrogen backup system (2). The starting end of the spiral groove (12) corresponds to the reducer (11), and the spiral groove (12) extends toward the common pipeline (3).

7. The instrument gas backup system of a high purity nitrogen device according to claim 6, characterized in that: The reducer (11) comprises a mounting rod (111) in a supply pipeline of an instrument nitrogen backup system (2) and an umbrella-shaped frame arranged on the mounting rod (111), the umbrella-shaped frame being covered with an elastic cloth (113), and an unfolding member being arranged on the mounting rod, the unfolding member being used to drive the umbrella-shaped frame to unfold and drive the elastic cloth (113) to unfold.

8. The instrument gas backup system of a high purity nitrogen device according to claim 7, characterized in that: The umbrella-shaped frame comprises a plurality of support rods (112) arranged on a mounting rod (111); the plurality of support rods (112) are evenly arranged along the circumference of the mounting rod (111) and are hinged on the mounting rod (111); a mounting ring (114) is slidably sleeved on the mounting rod (111); the mounting ring (114) is provided with inclined rods (115) corresponding to the support rods (112) one by one; two ends of the inclined rods (115) are respectively hinged on the mounting ring (114) and the support rod (112); and the unfolding member is used to drive the mounting ring (114) to slide along the mounting rod (111).

9. The instrument gas backup system of a high purity nitrogen device according to claim 8, characterized in that: The unfolding member comprises a micro motor (116) and a lead screw (117) rotatably arranged on a mounting rod (111); the lead screw (117) is coaxially arranged on an output shaft of the micro motor (116); and the mounting ring (114) is threadedly connected to the lead screw (117).

10. The instrument gas backup system of a high purity nitrogen device according to claim 7, characterized in that: A conical block (14) is provided at the end of the installation rod (111), and the bottom diameter of the conical block (14) is larger than the diameter of the installation rod (111).

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