Precise flow generating mechanism

Abstract

The utility model discloses a precise flow generation mechanism, and belongs to the technical field of flow generation devices.The precise flow generation mechanism drives a lead screw shaft to do precise linear motion through a driving device, the motion of the lead screw shaft further pushes a piston to do reciprocating motion in a cylinder barrel, suction and exhaust of gas are achieved, and in order to precisely measure the flow of the gas, the precision of the flow generation mechanism is improved. The device is provided with the distance measuring mechanism, the distance measuring mechanism is used for measuring displacement data of the lead screw shaft, on this basis, the displacement amount of the piston can be accurately calculated in combination with the known diameter of the cylinder barrel, so that the volume of sucked and exhausted gas is determined, and finally, the flow of the gas can be accurately obtained through real-time monitoring and calculation; by means of the design, the precision of flow measurement is improved, and the stability and reliability are ensured through the optimized mechanical structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flow generating device technical field, concretely relates to a precision flow generating mechanism. BACKGROUND

[0002] Flow generating devices are widely used in industrial production and laboratory research. For example, in chemical production, it can be used to control the rate of reaction, thereby controlling the quality and yield of products. In the laboratory, it can be used to control the flow and pressure in the test to ensure the accuracy of the experimental results.

[0003] However, the flow calculation of the existing flow generating device is usually measured by installing a flow meter in the input port of the cylinder. Although this method is simple and convenient, the measurement accuracy depends on the level of the flow meter, and the error is between 0.1% and 4%. Moreover, the flow meter is a precision instrument, and its stability and reliability are problematic in some severe external environmental conditions. UTILITY MODEL CONTENT

[0004] To solve the problems raised in the background art, the utility model provides a precision flow generating mechanism to solve the problem that the flow measurement accuracy of the existing flow generating device is affected by the level of the flow meter, and the problem of insufficient stability and reliability of the flow meter in some severe external environmental conditions.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A precision flow generating mechanism comprises:

[0007] A bottom plate;

[0008] A cylinder; the cylinder is fixedly installed on the bottom plate, the first end of the cylinder is provided with an airflow through hole, and the second end of the cylinder is provided with a mounting through hole;

[0009] A piston; the piston is slidably arranged in the cylinder;

[0010] A lead nut rotary ball screw; the lead nut rotary ball screw comprises a screw shaft and a nut end, the first end of the screw shaft passes through the mounting through hole and is fixedly connected with the piston, the second end of the screw shaft is arranged outside the cylinder, the nut end comprises a nut and a nut shell sleeved on the nut, and the nut shell is fixedly connected with the mounting through hole;

[0011] A driving device; the driving device is fixedly connected with the nut, and the driving device is used for driving the nut to rotate counterclockwise or clockwise;

[0012] A distance measuring mechanism; the distance measuring mechanism is fixedly connected with the second end of the screw shaft, and the distance measuring mechanism is used for measuring the displacement value of the screw shaft.

[0013] Preferably, the driving device comprises:

[0014] a motor;

[0015] a first gear; the first gear is sleeved on the rotating shaft of the motor;

[0016] a second gear; the screw rod shaft is arranged through the second gear, the second gear is coaxially arranged with the nut, and the second gear is fixedly connected with the nut;

[0017] a transmission belt; one end of the transmission belt is sleeved on the first gear, and the other end of the transmission belt is sleeved on the second gear; when the rotating shaft of the motor drives the first gear to rotate, the first gear drives the second gear to rotate through the transmission belt, and the second gear drives the nut to rotate.

[0018] Preferably, the distance measuring device comprises:

[0019] an L-shaped connecting rod; the L-shaped connecting rod comprises a first connecting rod and a second connecting rod; the first connecting rod is arranged in parallel with the screw rod shaft; the first end of the second connecting rod is fixedly connected with the first end of the first connecting rod; and the second end of the second connecting rod is fixedly connected with the second end of the screw rod shaft;

[0020] a slide rail; the slide rail is arranged on the bottom plate and arranged in parallel with the screw rod shaft;

[0021] a sliding block; the sliding block is slidably arranged on the slide rail and fixedly connected with the second end of the first connecting rod;

[0022] a grating reading head; the grating reading head is fixedly installed on the sliding block;

[0023] a grating ruler; the grating ruler is installed on the bottom plate and arranged in parallel with the slide rail; and the reading end of the grating reading head is directed to the scale surface of the grating ruler.

[0024] Preferably, the precise flow generating mechanism further comprises a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are respectively used for monitoring temperature data in the cylinder and atmospheric pressure data outside the cylinder.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The application drives the lead screw shaft to perform precise linear motion through the driving device, and the motion of the lead screw shaft further drives the piston to perform reciprocating motion in the cylinder, so as to realize the suction and discharge of the gas. In order to accurately measure the flow of the gas, the application is provided with a distance measuring mechanism for measuring the displacement data of the lead screw shaft. On this basis, the displacement of the piston can be accurately calculated in combination with the known diameter of the cylinder, so as to determine the volume of the suction and discharge of the gas. Finally, the flow of the gas can be accurately obtained through real-time monitoring and calculation. This design not only improves the accuracy of the flow measurement, but also ensures the stability and reliability through the optimized mechanical structure. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of the application;

[0028] Figure 2 is a specific structure schematic view of the application;

[0029] in the figure is:

[0030] 1-cylinder; 2-supporting plate; 3-bottom plate; 4-slideway; 5-slideway block; 6-connecting plate; 7-first gear; 8-first connecting rod; 9-second connecting rod; 10-lead screw shaft; 11-second gear; 12-transmission belt; 13-nut housing; 14-nut; 15-piston; 16-optical grating reading head; 17-optical grating ruler. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0032] Embodiment 1:

[0033] As shown in Figure 1 , Figure 2 , a precise flow generating mechanism comprises:

[0034] a bottom plate 3;

[0035] two supporting plates 2; the two supporting plates 2 are vertically arranged on the bottom plate 3;

[0036] a cylinder 1; the two ends of the cylinder 1 are fixedly connected with the top ends of the two supporting plates 2, respectively; the first end of the cylinder 1 is provided with a gas flow through hole, the second end of the cylinder 1 is provided with a mounting through hole, and the bottom end of the supporting plate 2 connected with the second end of the cylinder is provided with a measuring through hole;

[0037] Piston 15; the piston 15 is slidably arranged in the cylinder 1;

[0038] Lead nut rotary ball screw; the lead nut rotary ball screw comprises a screw shaft 10 and a nut end, the first end of the screw shaft 10 is fixedly connected with the piston 15 through the mounting hole, the second end of the screw shaft 10 is arranged outside the cylinder 1, the nut end comprises a nut 14 and a nut shell 13 sleeved on the nut 14, the nut shell 13 is fixedly connected with the mounting hole, the lead nut rotary ball screw adopts a large lead nut rotary ball screw BLR type;

[0039] Driving device; the driving device is fixedly connected with the nut 14, and is used for driving the nut 14 to rotate counterclockwise or clockwise;

[0040] Distance measuring mechanism; the distance measuring mechanism is fixedly connected with the second end of the screw shaft 10, and is used for measuring the displacement value of the screw shaft 10.

[0041] In the embodiment, the driving device drives the screw shaft 10 to perform accurate linear motion, the motion of the screw shaft 10 further drives the piston 15 to perform reciprocating motion in the cylinder 1, so that the gas is inhaled and discharged, in order to accurately measure the flow of the gas, the distance measuring mechanism is arranged, the distance measuring mechanism is used for measuring the displacement data of the screw shaft 10, on the basis of the known diameter of the cylinder 1, the displacement of the piston 15 can be accurately calculated, so that the volume of the inhaled and discharged gas is determined, finally, through real-time monitoring and calculation, the flow of the gas can be accurately obtained, the design not only improves the accuracy of the flow measurement, but also ensures the stability and reliability through the optimized mechanical structure.

[0042] Embodiment 2:

[0043] The difference between the embodiment and the embodiment 1 is that, as shown in Figure 1 、 Figure 2 The driving device comprises:

[0044] Motor;

[0045] First gear 7; the first gear 7 is sleeved on the rotating shaft of the motor;

[0046] Second gear 11; the screw shaft 10 passes through the second gear 11 and is arranged, the second gear 11 is coaxially arranged with the nut 14, and the second gear 11 is fixedly connected with the nut 14;

[0047] Transmission belt 12; one end of the transmission belt 12 is sleeved on the first gear 7, and the other end of the transmission belt 12 is sleeved on the second gear 11, when the rotating shaft of the motor drives the first gear 7 to rotate, the first gear 7 drives the second gear 11 to rotate through the transmission belt 12, and the second gear 11 drives the nut 14 to rotate.

[0048] In the embodiment, the moving speed of the screw shaft 10 can be controlled by controlling the on-off of the motor and the rotating speed of the rotating shaft of the motor, and the moving speed of the piston 15 is controlled, so as to realize the controllable gas flow speed.

[0049] Embodiment 3

[0050] The difference between the embodiment and the embodiment 1 is that, as shown in Figure 1 、 Figure 2 The distance measuring device comprises:

[0051] The L-shaped connecting rod comprises a first connecting rod 8 and a second connecting rod 9, the first connecting rod 8 is arranged in parallel with the screw shaft 10 through the measuring through hole, the first end of the second connecting rod 9 is fixedly connected with the first end of the first connecting rod 8, the second end of the second connecting rod 9 is fixedly connected with the second end of the screw shaft 10, and the second connecting rod 9 is perpendicular to the first connecting rod 8;

[0052] Two slide rails 4; the slide rails 4 are arranged on the bottom plate 3, and the two slide rails 4 are arranged in parallel with the screw shaft 10;

[0053] Two sliding blocks 5; one sliding block 5 is slidably arranged on one slide rail 4;

[0054] A connecting plate 6; the two bottom ends of the connecting plate 6 are respectively installed on the two sliding blocks 5, and the connecting plate 6 is fixedly connected with the second end of the first connecting rod 8;

[0055] A grating reading head 16; the grating reading head 16 is fixedly installed on one side of the connecting plate 6;

[0056] A grating ruler 17; the grating ruler 17 is installed on the bottom plate 3, the grating ruler 17 is arranged in parallel with the slide rail 4, and the reading end of the grating reading head 16 is directed to the scale surface of the grating ruler 17.

[0057] In the embodiment, when the screw shaft 10 drives the piston 15 to move, since the screw shaft 10 is fixedly connected with the first connecting rod 8 and the first connecting rod 8 is parallel with the screw shaft 10, the displacement of the screw shaft 10 is the same as the displacement of the first connecting rod 8, the displacement distance of the first connecting rod 8 can be accurately read by the grating reading head 16 installed on the first connecting rod 8 and the grating ruler 17 installed on the bottom plate 3, and then the displacement distance of the piston 15 is obtained, and the volume of the pushed-out or sucked-in gas can be calculated through the known diameter of the cylinder 1, and then the flow of the gas is obtained through the displacement time.

[0058] Embodiment 4

[0059] The difference between the embodiment and the embodiment 1 is that, as shown in Figure 1 、 Figure 2As shown, the precise flow generating mechanism further comprises a temperature sensor and a pressure sensor, both of which are arranged on the cylinder 1 outside the airflow through hole, and are used to monitor the temperature data in the cylinder 1 and the atmospheric pressure data outside the cylinder 1, respectively.

[0060] In this embodiment, since the atmospheric pressure is inversely proportional to the altitude, the higher or lower the altitude is, the lower or higher the atmospheric pressure is, and the gas density is closely related to the temperature, therefore, the temperature sensor and the pressure sensor are arranged on the cylinder 1, and the measured values of the temperature sensor and the pressure sensor are taken as variables in the flow calculation to obtain more accurate measurement data.

[0061] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A precision flow generator mechanism, characterized by, The utility model relates to a precise flow generating mechanism, which comprises a base plate (3), a cylinder barrel (1), a piston (15), a lead nut rotary ball screw, a driving device, a distance measuring mechanism, a motor, a first gear (7), a second gear (11), a transmission belt (12), an L-shaped connecting rod, a slide rail (4), a sliding block (5), a grating reading head (16) and a grating ruler (17). The cylinder barrel (1) is fixedly installed on the base plate (3), the first end of the cylinder barrel (1) is provided with an airflow through hole, and the second end of the cylinder barrel (1) is provided with a mounting through hole. The piston (15) is slidably arranged in the cylinder barrel (1). The lead nut rotary ball screw comprises a screw shaft (10) and a nut end, the first end of the screw shaft (10) penetrates through the mounting through hole and is fixedly connected with the piston (15), the second end of the screw shaft (10) is arranged outside the cylinder barrel (1), and the nut end comprises a nut (14) and a nut shell (13) sleeved on the nut (14), the nut shell (13) is fixedly connected with the mounting through hole. The driving device is fixedly connected with the nut (14) and is used for driving the nut (14) to rotate counterclockwise or clockwise. The distance measuring mechanism is fixedly connected with the second end of the screw shaft (10) and is used for measuring the displacement value of the screw shaft (10). The driving device comprises a motor, a first gear (7), a second gear (11), a transmission belt (12), an L-shaped connecting rod, a slide rail (4), a sliding block (5), a grating reading head (16) and a grating ruler (17).

2. The precision flow generator of claim 1, wherein, The first gear (7) is sleeved on the rotating shaft of the motor. The second gear (11) is coaxially arranged with the nut (14) and is fixedly connected with the nut (14). One end of the transmission belt (12) is sleeved on the first gear (7), the other end of the transmission belt (12) is sleeved on the second gear (11), when the rotating shaft of the motor drives the first gear (7) to rotate, the first gear (7) drives the second gear (11) to rotate through the transmission belt (12), and the second gear (11) drives the nut (14) to rotate. The distance measuring device comprises an L-shaped connecting rod, a slide rail (4), a sliding block (5), a grating reading head (16) and a grating ruler (17). The first end of the second connecting rod (9) is fixedly connected with the first end of the first connecting rod (8), and the second end of the second connecting rod (9) is fixedly connected with the second end of the screw shaft (10).

3. The precision flow generator of claim 1, wherein, The slide rail (4) is arranged on the base plate (3) and is arranged in parallel with the screw shaft (10). The sliding block (5) is slidably arranged on the slide rail (4) and is fixedly connected with the second end of the first connecting rod (8). The grating reading head (16) is fixedly installed on the sliding block (5). The grating ruler (17) is installed on the base plate (3) and is arranged in parallel with the slide rail (4), and the reading end of the grating reading head (16) points to the scale surface of the grating ruler (17). The precise flow generating mechanism further comprises a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are respectively used for monitoring the temperature data in the cylinder barrel (1) and the atmospheric pressure data outside the cylinder barrel (1). ​ 4. The precision flow generator of claim 1, wherein, ​

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