A precisely controlled gas calibration cylinder

Abstract

The present invention relates to a precisely controlled gas calibration cylinder, which mainly includes: a plastic base, an air pipe, an air pipe sealing ring, an air outlet, a rubber sealing ring, an air cylinder, a short anti-collision strip, a long anti-collision strip, a piston, an air pumping end, a bearing, a piston rod, a handle, a card mark, a pull rod, a baffle, a bolt, a nut, a scale screw, and a caliper; the plastic base is located at one end of the entire gas calibration cylinder; the air pipe is located in the inner cavity of the plastic base and is fixed on the air outlet. When in use, the gas volume can be set arbitrarily according to needs, that is, by rotating the position of the nut on the scale screw, the card mark head points to the corresponding position on the caliper to determine the realized volume, and the card bolt is limited; then the handle is manually pushed to drive the piston to move to a limited position, and the required gas volume can be obtained. The present invention can adjust the calibration and detection of any volume of 0 to 3L through the screw; it contains quick connectors of different models and sizes, which can meet the air inlet interface of common pulmonary function meters.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement, and in particular relates to a precisely controlled gas calibration cylinder. Background Art

[0002] Pulmonary function test is one of the necessary means of examination for respiratory diseases. In the past, pulmonary function instruments were mainly based on mechanical and chemical methods. The measurement was cumbersome, time-consuming and labor-intensive, and the detection error was large, which limited its wide application in clinical practice. In recent years, with the development of science and technology, the emergence of new detection technologies, especially the application of electronic computers, has greatly developed pulmonary function detection technology, and its importance in clinical practice has been increasingly valued. After a certain period of use, the pulmonary function instrument needs to be tested regularly. When testing the pulmonary function instrument, the traditional precise and accurate electronically controlled breathing simulator is too bulky, large in size, high in cost, and noisy, which is particularly inconvenient for the tester to carry out; and the manual breathing simulator has a single range and low accuracy. It is quite inconvenient to carry a large volume series cylinder for outdoor testing.

[0003] Existing electrically controlled breathing simulators simulate the breathing process by controlling the servo motor to drive the syringe. The main features are high precision and the ability to calibrate flow and volume. For example, the domestic SCD-A standard breathing simulator and the foreign Aeolus breathing simulator. Existing electrically controlled breathing simulators have the following main disadvantages: ① Large size: a syringe and a servo motor module are required; ② Bulky: the servo motor itself is bulky and requires a fixing device, which makes it even more bulky and inconvenient to carry, with a minimum weight of more than 20kg; ③ High cost: the servo motor itself is expensive and requires a driver and program writing; ④ The air outlet interface is not adjustable: the air outlet interface is single and cannot cope with different interfaces from different manufacturers.

[0004] The existing manual breathing simulator completes the simulated breathing process by manually inhaling or expelling a certain volume of gas at one time. The main feature is that it is easy to carry, but it can only calibrate the volume. For example, Carefusion 3L calibration syringe; Vitalograph 3L calibration syringe. The existing manual air pumps have the following main disadvantages: ① Single measurement and poor practicality: The existing manual air pumps cannot measure any volume, but only a fixed volume. When multiple volumes need to be measured, it is necessary to carry a series of manual air pumps, which is very inconvenient. ② Poor accuracy: Due to the manual fixed volume method, the accuracy is completely dependent on the accuracy of production and assembly, and the accuracy controllability is very poor, and the overall detection accuracy is even worse. ③ The air outlet interface is not adjustable: The air outlet interface is single and cannot cope with different interfaces from different manufacturers. Summary of the invention

[0005] In order to overcome the above defects, the present invention provides a gas calibration cylinder with small volume and high precision.

[0006] A precisely controlled gas calibration cylinder, which mainly includes: a plastic base, an air pipe, an air pipe sealing ring, an air outlet, a rubber sealing ring, an air cylinder, a short anti-collision strip, a long anti-collision strip, a piston, an air pumping end, a bearing, a piston rod, a handle, a clamp, a pull rod, a baffle, a clamp bolt, a nut, a scale screw, and a caliper; the plastic base is located at one end of the entire gas calibration cylinder; the air pipe is located in the inner cavity of the plastic base and is fixed on the air outlet; the air pipe sealing ring is located between the air pipe and the air outlet; the air outlet is respectively fastened to the plastic base and the connecting air cylinder by bolts, and is in active contact with the piston through the short anti-collision strip and the long anti-collision strip; the short anti-collision strip and the long anti-collision strip are respectively The rubber sealing ring is located between the connecting cylinder and the air outlet end, and the closed space formed between the connecting cylinder and the air outlet end is air-tightened; the piston rod passes through the air pumping end, and the bearing and the piston are rigidly fastened by bolts, and the bearing set is fixed on the air pumping end, so that the piston rod moves linearly; the card mark is fixed in the nut and moves linearly with the nut; the nut set is in the corresponding position of the scale screw to form an adjustable screw; the pull rod is rigidly connected to the card bolt; the baffle is fixed on the position rod for starting and limiting; the scale screw and the piston rod are arranged in parallel, and the two ends of the two are respectively fixed on the corresponding positions of the piston and the handle;

[0007] When in use, the gas volume can be set arbitrarily according to needs, that is, by rotating the position of the nut on the scale screw, the mark head of the card points to the corresponding position on the caliper to determine the achieved volume, and the card bolt is used to limit the position; then the handle is manually pushed to drive the piston to move to the limited position to obtain the required gas volume.

[0008] The outer circumferential surface of the piston rod is axially provided with a small plane to ensure that the piston does not rotate.

[0009] The gas calibration cylinder of the present invention adopts manual control mode and has the following advantages:

[0010] (1) The gas volume is adjustable and can be set within the range of 0 to 3 L. The scale resolution is 10 mL and the fine-tuning knob resolution is 1 / 3 mL per grid.

[0011] (2) High precision, can be corrected with a standard instrument, and the resolution is 1 / 3mL per grid;

[0012] (3) The air outlet interface is adjustable to achieve adjustable resistance.

[0013] (4) Small size (50*16*16cm3); light weight (less than 5kg); low cost; manually operated, no motor or circuit drive required. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the gas calibration cylinder of the present invention.

[0015] Figure 2 It is a front view of the gas calibration cylinder of the present invention;

[0016] Figure 3 A top view of the gas calibration cylinder of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the piston in the gas calibration cylinder of the present invention;

[0018] Figure 5 It is a schematic diagram of the structure of the piston rod in the gas calibration cylinder of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 5As shown, a precisely controlled gas calibration cylinder mainly includes: a plastic base 1, an air pipe 2, an air pipe sealing ring 3, an air outlet 4, a rubber sealing ring 5, an air cylinder 6, a short anti-collision strip 7, a long anti-collision strip 8, a piston 9, an air pumping end 10, a bearing 11, a piston rod 12, a handle 13, a clamping mark 14, a pull rod 15, a baffle 16, a bolt 17, a nut 18, a scale screw 19, and a caliper 20. The plastic base 1 is located at one end of the entire gas calibration cylinder, which is convenient for being placed on an operating plane. The air pipe 2 is located in the inner cavity of the plastic base 1 and is fixed on the air outlet 4 to fix the gas volume. The air pipe sealing ring 3 is located between the air pipe 2 and the air outlet 4, and is used for gas sealing between the air pipe 2 and the air outlet 4. The air outlet 4 is respectively fastened to the plastic base 1 and the connecting air cylinder 6 by bolts, and is in active contact with the piston 9 through the short anti-collision strip 7 and the long anti-collision strip 8. The short anti-collision strip 7 and the long anti-collision strip 8 are respectively fixed at the corresponding positions of the piston 9 to reduce the impact of the piston 9 on the outlet end 4 when the piston 9 moves. The rubber sealing ring 5 is located between the connecting cylinder 6 and the outlet end 4, and is used to seal the closed space formed between the connecting cylinder 6 and the outlet end 4. The piston rod 12 passes through the pumping end 10, the bearing 11 and the piston 9 are rigidly fastened by bolts. The bearing 11 is fixed on the pumping end 10, and guides the piston rod 12 to ensure that the piston rod 12 moves in a straight line to achieve reciprocating compressed air. At the same time, a small plane is axially provided on the outer cylindrical surface of the piston rod 12 to fix the direction, realize the guiding function, and ensure that the piston 9 does not rotate. The plastic handle 13 is rigidly fastened to the piston rod 12 by bolts, which is convenient for hand grasping, pushing and pulling. The card mark 14 is fixed in the nut 18 and moves linearly with the nut 18. The card mark 14 can read the set volume in large scale. There are marking lines on the nut 18, and you can see how much the marking lines are moved and read the small scale. The nut 18 is mounted on the corresponding position of the scale screw 19 to form an adjustable screw. By rotating the nut 18 and observing the degree of the caliper 20 corresponding to the scale screw, plus the graduation on the nut 18, the volume of the calibration gas can be accurately adjusted. The pull rod 15 is rigidly connected to the bolt 17. The nut 18 can be pulled out only when the pull rod 15 is pulled up. The position of the nut 18 is adjusted. After the adjustment is completed, the piston 9 returns to the bottom and the pull rod 15 is restored. The baffle 16 is used to limit the range of motion of the pull rod 15 and plays a limiting role. The bolt 17 is used to limit the range of motion of the piston 9. The scale screw 19 is arranged in parallel with the piston rod 12, and the two ends of the two are fixed on the corresponding positions of the piston 9 and the handle 13 respectively. The air pipe 2 is rigidly connected and sealed with the interface converter. The interface converter is equipped with 6 common interface types of quick connectors (with built-in switches), which can be applied to interfaces of different manufacturers and different models. The material of the connecting cylinder 6 is organic glass. The material of the piston 9 is aluminum alloy.

[0021] The invention adopts light materials such as organic glass and aluminum alloy, and has light weight. At the same time, because it adopts equipment such as servo motor, it has low cost, does not need additional fixing mechanism, and has small size.

[0022] The working principle of the gas calibration cylinder of the present invention is:

[0023] (1) The working principle of the piston syringe is used to discharge and inhale a specific volume of gas, such as Figure 2 As shown, the piston 9 and the piston rod 12 form a movable piston. A person pushes and pulls the handle 13 to drive the piston 9 to do reciprocating motion, thereby achieving the inhalation and discharge of gas.

[0024] (2) To achieve any setting of 0-3L gas, rotate the position of the nut 18 on the scale screw 19 and observe the position of the head of the card mark 14 pointing to the caliper 20 (the total range on the caliper is 0-3L, and each liter is divided into 100 parts). For example, when you need to achieve 2L volume calibration, adjust the card mark 14 head to point to the 2L position on the caliper 20. At the same time, observe the position of the nut 18 to improve the accuracy of the reading (10mL, 30 grids, resolution 1 / 3mL).

[0025] (3) Six quick connectors of common sizes used on spirometers are installed on the outlet port conversion valve, each with a switch (to ensure that the air paths are unobstructed and consistent).

[0026] Advantages of using the gas calibration cylinder of the present invention:

[0027] (1) Manual volume adjustment: By rotating the nut and adjusting the position of the nut on the scale screw, the gas volume can be determined. The volume can be set according to the user's needs.

[0028] (2) Precise volume control: The gas volume can be accurately set by rotating the nut on the scale screw. During the movement, the cap edge of the rotating nut reaches the bolt and is positioned and restricted, thus achieving precise control of the gas volume.

[0029] (3) Gas volume position locking: The volume locking is achieved by limiting the rotation range of the nut through the bolt.

[0030] (4) The air outlet interface is switchable: by selecting the size of the air outlet, the resistance can be adjusted and the air inlet can be switched.

[0031] (5) The entire gas calibration cylinder is light in weight, small in size and low in cost.

Claims

1. A precisely controlled gas calibration cylinder, characterized in that: The gas calibration cylinder mainly comprises: a plastic base (1), an air pipe (2), an air pipe sealing ring (3), an air outlet end (4), a rubber sealing ring (5), an air cylinder (6), a short anti-collision strip (7), a long anti-collision strip (8), a piston (9), an air pump end (10), a bearing (11), a piston rod (12), a handle (13), a clamping mark (14), a pull rod (15), a baffle (16), a clamping bolt (17), a nut (18), a caliper screw (19), and a caliper (20); the plastic base (1) is located at One end of the entire gas calibration cylinder; the gas pipe (2) is located in the inner cavity of the plastic base (1) and is fixed on the gas outlet end (4); the gas pipe sealing ring (3) is located between the gas pipe (2) and the gas outlet end (4); the gas outlet end (4) is respectively fastened to the plastic base (1) and the connecting gas cylinder (6) by bolts, and is in active contact with the piston (9) through a short anti-collision strip (7) and a long anti-collision strip (8); the short anti-collision strip (7) and the long anti-collision strip (8) are respectively fixed at corresponding positions of the piston (9); the rubber sealing ring (5) The piston rod (12) is located between the connecting cylinder (6) and the gas outlet end (4), and the closed space formed between the connecting cylinder (6) and the gas outlet end (4) is airtightly sealed; the piston rod (12) passes through the gas pumping end (10), and the bearing (11) is rigidly fastened to the piston (9) by bolts, and the bearing (11) is fixed on the gas pumping end (10), so that the piston rod (12) moves linearly; the clamping mark (14) is fixed in the nut (18) and moves linearly with the nut (18); the nut (18) is mounted on the scale screw (19) is arranged at a corresponding position to form an adjustable screw rod; the pull rod (15) is rigidly connected to the clamping bolt (17); the baffle (16) is fixed on the position rod (15) for limiting; the scale screw rod (19) is arranged in parallel with the piston rod (12), and the two ends of the scale screw rod (19) are respectively fixed on the corresponding positions of the piston (9) and the handle (13); the caliper (20) is arranged on the scale screw rod (19); a large scale reading is arranged on the caliper (20); and a marking line is arranged on the nut (18) for small scale reading; When in use, the gas volume can be set as required, that is, by rotating the nut (18) on the scale screw (19) so that the head of the card mark (14) points to the corresponding position on the caliper (20) to determine the achieved volume, and limiting the position by the card bolt (17); then, by manually pushing the handle (13) to drive the piston (9) to move to a limited position, the required gas volume is obtained.

2. The precisely controlled gas calibration cylinder according to claim 1, characterized in that: The outer circumferential surface of the piston rod (12) is axially provided with a small flat surface to ensure that the piston (9) does not rotate.

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