Air pressure measurement calibration device

Abstract

The utility model discloses an air pressure measuring and calibrating device which comprises a base, an air exhaust interface is arranged on the base, a vacuum air pump covering the air exhaust interface is placed on the base, the base is provided with a first supporting rod, a supporting plate and a lifting panel, a circuit board of the vacuum air pump is provided with a switch button and a conductive protrusion, and the vacuum air pump is further provided with an air pump. The conductive protrusion is an air pressure signal output end of the air pressure detection sensor, an air suction nozzle at the bottom of the vacuum air suction pump is in contact communication with the air suction interface to form a closed exhaust channel, and an air pressure signal acquisition probe capable of being in electric contact with the conductive protrusion is arranged on the lifting panel. The air pressure signal acquisition probe is electrically connected with the control circuit through the analog-to-digital conversion circuit, the control end of the sucking pump is electrically connected with the control circuit through the sucking pump driving circuit, and the power supply circuit and the switch key are electrically connected with the control circuit. The operation is more convenient than the prior art.

Description

Technical Field

[0001] The utility model relates to a measuring device, in particular to an air pressure measuring and calibrating device. Background Art

[0002] The vacuum pump sucks out the air in the vacuum compression bag or vacuum box to achieve the effects of preservation or volume compression. The air pressure in the vacuum compression bag or vacuum box usually needs to reach a specified calibration value. In order to test whether the artificially set calibration value is reached, the common practice is that the vacuum pump first sucks out the air in the vacuum compression bag or vacuum box, and then the probe of the air pressure detector is inserted into the vacuum compression bag or vacuum preservation box to detect the air pressure. When the air pressure detector detects that the air pressure reaches the calibration value, the vacuum pump is turned off. Since the needle of the air pressure detector is inserted into the vacuum compression bag or vacuum preservation box, it is necessary to pierce the stopper of the vacuum compression bag or vacuum preservation box reserved for the probe to be inserted. The disadvantage of this method is that the operation is very inconvenient, and the air pressure detector makes the cost of the entire method relatively high. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, one object of the utility model is to provide an air pressure measurement and calibration device that is easy to operate.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A pressure measurement and calibration device comprises a base, wherein the base is provided with an air extraction interface, a vacuum pump covering the air extraction interface is placed on the base, a first support rod is provided on the top of the base, a support plate is fixedly provided on the first support rod, a lifting panel is provided below the support plate, a pull rod structure connected to and driving the lifting panel to lift is provided above the support plate, a guide rail structure for guiding the moving direction of the lifting panel is provided between the support plate and the lifting panel, an air pump driving circuit, a control circuit, a power supply circuit, a switch button, and a conductive protrusion are provided on the circuit board at the top of the vacuum pump, and the vacuum pump is also provided with an air pump, the conductive The protrusion is the air pressure signal output end of the air pressure detection sensor. The suction nozzle at the bottom of the vacuum pump serves as the air inlet of the air pump and is in contact with the air extraction interface to form a closed exhaust channel. The exhaust port of the air pump is connected to the outside world. The detection end of the air pressure detection sensor is located in the exhaust channel. The lifting panel is provided with an air pressure signal acquisition probe that can electrically contact the conductive protrusion. The air pressure signal acquisition probe is electrically connected to the control circuit through an analog-to-digital conversion circuit. The control end of the air pump is electrically connected to the control circuit through the air pump drive circuit. The power supply circuit and the switch button are electrically connected to the control circuit respectively.

[0006] The pull rod structure includes a second support rod fixed to the top surface of the support plate and a pull rod assembly, the pull rod assembly includes a hinge seat fixed to the second support rod, the hinge seat is hinged to one end of the pull rod, the other end of the pull rod is hinged to one end of the arc-shaped transmission member and then extends upward to form an operating handle, the other end of the arc-shaped transmission member is hinged to one end of the lifting support rod, and the other end of the lifting support rod passes through the through hole on the support plate and is fixedly connected to the top surface of the lifting panel.

[0007] The other end of the lifting support rod is threadedly connected to one end of the nut, and the other end of the nut is fixedly connected to the top surface of the lifting panel by glue.

[0008] The guide rail structure comprises a guide rail bar fixed to the bottom surface of the support plate and a guide groove on the lifting panel. After assembly, the guide rail bar is inserted into the guide groove.

[0009] The first support rod is provided with an upper positioning block located between the lifting panel and the base, the upper positioning block is provided with an upper positioning port, and the base is provided with a lower positioning port corresponding to the upper positioning port. After assembly, the top end of the vacuum pump is located in the upper positioning port, and the bottom end of the vacuum pump is located in the lower positioning port.

[0010] The vacuum pump and the air pressure detection sensor are located in the housing of the vacuum pump, and an elastic air guide ring is provided at the contact point between the vacuum nozzle of the vacuum pump and the vacuum interface.

[0011] The air pressure signal acquisition probe includes a fixed conductive tube and a movable conductive tube, the fixed conductive tube is fixed to the inner side of the lifting panel, the top end of the movable conductive tube extends from the bottom end of the fixed conductive tube into the interior of the fixed conductive tube, the top end of the movable conductive tube and the top end of the fixed conductive tube are connected by a reset spring, and the fixed conductive tube is electrically connected to the analog-to-digital conversion circuit.

[0012] One end of the air extraction interface is located on the top surface of the base, and the other end is communicated with an air pipe on the side of the base, and the air pipe is communicated with the air extraction interface.

[0013] The beneficial effects of the utility model are as follows: the vacuum pump driving circuit is used to drive the vacuum pump, the control circuit is used to control the entire vacuum vacuum pump, the power supply circuit supplies power to the entire vacuum vacuum pump, the switch button is used to start or shut down the vacuum vacuum pump, the air pressure detection sensor is used to detect the air pressure inside the vacuum compression bag or the vacuum fresh-keeping box, before use, the pull rod structure drives the lifting panel to descend, the guide rail structure guides the descending path of the lifting panel, the conductive protrusion is in electrical contact with the air pressure signal collection probe, the air pressure detection sensor outputs an analog signal, the analog-to-digital conversion circuit converts the analog signal into a digital signal, and the control circuit converts the digital signal into a corresponding air pressure Value, the control circuit pre-sets a manually set calibration air pressure value, the vacuum compression bag or the vacuum preservation box is connected to the air extraction interface, the switch button is pressed to start the vacuum extraction pump, the control circuit drives the extraction pump through the extraction pump driving circuit, the extraction pump extracts the air inside the vacuum compression bag or the vacuum preservation box to change the internal air pressure, when the air pressure detection sensor detects that the air pressure value inside the measured object reaches the calibration air pressure value, the control circuit turns off the extraction pump through the extraction pump driving circuit, the entire measurement process does not need to puncture the vacuum compression bag or the vacuum preservation box with a plug reserved for the probe to pierce, the operation is more convenient than the prior art, and the cost is lower than the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a structural exploded view of the utility model;

[0017] Figure 3 is a cross-sectional view of the air pressure signal acquisition probe;

[0018] Figure 4 It is a cross-sectional view of the suction nozzle;

[0019] Figure 5 It is the structural framework diagram of the vacuum pump. DETAILED DESCRIPTION

[0020] Reference Figures 1 to 5A pressure measurement and calibration device comprises a base 1, on which a vacuum pump 2 covering the vacuum pump 11 is placed, a first support rod 12 is arranged on the top of the base 1, a support plate 121 is fixedly arranged on the first support rod 12, a lifting panel 122 is arranged below the support plate 121, a rod structure connected to and driving the lifting panel 122 to rise and fall is arranged above the support plate 121, and a guide lifting mechanism is arranged between the support plate 121 and the lifting panel 122. The guide rail structure of the panel 122 in the moving direction, the circuit board on the top of the vacuum pump 2 is provided with a vacuum pump driving circuit, a control circuit, a power supply circuit, a switch button 22, and a conductive protrusion 21, the vacuum pump 2 is also provided with a vacuum pump, the conductive protrusion 21 is the air pressure signal output end of the air pressure detection sensor, the suction nozzle at the bottom of the vacuum pump 2 serves as the air inlet of the vacuum pump, and is in contact with the vacuum interface 11 to form a closed exhaust channel, the exhaust port of the vacuum pump is connected to the outside, and the air pressure detection sensor The detection end of the sensor is located in the exhaust channel, and the lifting panel 122 is provided with an air pressure signal collection probe 123 that can electrically contact the conductive protrusion 21. The air pressure signal collection probe 123 is electrically connected to the control circuit through an analog-to-digital conversion circuit, and the control end of the vacuum pump is electrically connected to the control circuit through the vacuum pump drive circuit, and the power supply circuit and the switch button are electrically connected to the control circuit respectively. The vacuum pump, the vacuum pump drive circuit, the control circuit, and the power supply circuit are all prior arts, and their main function is to realize the extraction of air from the inside of the vacuum compression bag or the vacuum preservation box. The power supply circuit includes a battery, a charging management chip, a charging port, an LED indicator light, and a power amplifier chip. The output end of the battery is connected to the control circuit through the power amplifier chip, the input end of the battery is electrically connected to the charging management chip, and the charging management chip is electrically connected to the LED indicator light. The output power of the battery is amplified by the power amplifier chip and provided to the control circuit. The charging management chip provides the charging port with electrical energy. When working, the LED indicator light is on, otherwise it is off.

[0021] The vacuum pump driving circuit is used to drive the vacuum pump, the control circuit is used to control the entire vacuum pump, the power supply circuit supplies power to the entire vacuum pump, the switch button is used to start or shut down the vacuum pump, and the air pressure detection sensor is used to detect the air pressure inside the vacuum compression bag or vacuum preservation box. Before use, the pull rod structure drives the lifting panel to descend, and the guide rail structure guides the descending path of the lifting panel. The conductive protrusion is in electrical contact with the air pressure signal collection probe, and the air pressure detection sensor outputs an analog signal. The analog-to-digital conversion circuit converts the analog signal into a digital signal, and the control circuit converts the digital signal into a corresponding air pressure value. The control circuit pre-sets a manually set calibration air pressure value, and the true The empty compression bag or vacuum preservation box is connected to the vacuum interface, and the switch button is pressed to start the vacuum pump. The control circuit drives the vacuum pump through the vacuum pump driving circuit. The vacuum pump extracts the air inside the vacuum compression bag or vacuum preservation box to change the internal air pressure. When the air pressure detection sensor detects that the air pressure value inside the object to be measured reaches the calibrated air pressure value, the control circuit turns off the vacuum pump through the vacuum pump driving circuit (this part belongs to the prior art, and is only used here to clearly illustrate the working principle of the present application). The entire measurement process does not require puncturing the vacuum compression bag or the vacuum preservation box with a plug reserved for the probe to pierce. The operation is more convenient than the prior art and the cost is lower than the prior art.

[0022] The rod pulling structure includes a second support rod 125 fixed to the top surface of the support plate 121 and a rod pulling assembly, and the rod pulling assembly includes an articulated seat 3 fixed on the second support rod 125, the articulated seat 3 is hinged to one end of the lever 31, and the other end of the lever 31 is hinged to one end of the arc-shaped transmission member 32 and then extends upward to form an operating handle, the other end of the arc-shaped transmission member 32 is hinged to one end of the lifting support rod 33, and the other end of the lifting support rod 33 passes through the through hole on the support plate 121 and is fixedly connected to the top surface of the lifting panel 122, and the part of the articulated seat close to the arc-shaped transmission member is arc-shaped. When in use, the other end of the lever is pushed downward, and the arc-shaped transmission member and the lifting support rod 33 also drop accordingly, and the lifting panel also drops accordingly, and the conductive protrusion is in electrical contact with the air pressure signal acquisition probe, and the air pressure The detection sensor outputs an analog signal, the analog-to-digital conversion circuit converts the analog signal into a digital signal, and the control circuit converts the digital signal into a corresponding air pressure value. The control circuit pre-sets a manually set calibration air pressure value, the vacuum compression bag or the vacuum preservation box is connected to the vacuum interface, the switch button is pressed to start the vacuum pump, the control circuit drives the vacuum pump through the vacuum pump drive circuit, the vacuum pump extracts the air inside the vacuum compression bag or the vacuum preservation box to change the internal air pressure, when the air pressure detection sensor detects that the air pressure value inside the object to be measured reaches the calibration air pressure value, the control circuit turns off the vacuum pump through the vacuum pump drive circuit, when not in use, the other end of the lever is pushed upward, the arc-shaped transmission member and the lifting support rod 33 are also raised, the lifting panel is also raised, and the conductive protrusion is separated from the air pressure signal collection probe.

[0023] In order to adjust the length of the lifting rod 33 so as to facilitate the connection with the lifting panel, the other end of the lifting rod 33 is threadedly connected to one end of the nut 34, and the other end of the nut 34 is fixedly connected to the top surface of the lifting panel 122 by glue, and the width of the nut is greater than the width of the lifting rod.

[0024] The guide rail structure includes a guide rail bar 1211 fixed to the bottom surface of the support plate 121 and a guide groove on the lifting panel 122. After assembly, the guide rail bar is inserted into the guide groove. This structure is simple but easy to assemble and low in cost.

[0025] The first support rod 12 is provided with an upper positioning block 124 located between the lifting panel 122 and the base 1, and the upper positioning block 124 is provided with an upper positioning port 1241, and the base 1 is provided with a lower positioning port 1242 corresponding to the upper positioning port. After assembly, the top end of the vacuum pump 2 is located in the upper positioning port, and the bottom end of the vacuum pump 2 is located in the lower positioning port. With this structure, the vacuum pump can be located at the position specified by the base, thereby ensuring that the suction nozzle at the bottom of the vacuum pump 2 is aligned and attached to the suction interface 11 to prevent affecting the measurement results. The upper positioning port 1241 and the lower positioning port 1242 can be V-shaped.

[0026] The vacuum pump and the air pressure detection sensor are located in the shell of the vacuum vacuum pump. An elastic air guide ring 4 is provided at the contact point between the air suction nozzle of the vacuum vacuum pump 2 and the air suction interface 11. The elastic air guide ring 4 is mainly used to prevent external air from entering the exhaust channel and affecting the measurement result. The shell of the vacuum vacuum pump is cylindrical, and an air suction nozzle 7 is provided inside. The air suction nozzle 7 includes a partition 71 and a conduit 72 on the partition (the partition 71 separates the interior of the shell). The conduit 72 is connected to the air inlet of the vacuum pump, and the air inlet of the vacuum pump draws air through the conduit 72.

[0027] The air pressure signal acquisition probe 123 includes a fixed conductive tube 1231 and a movable conductive tube 1232, wherein the fixed conductive tube is fixed to the inner side of the lifting panel 122, and the top end of the movable conductive tube extends from the bottom end of the fixed conductive tube into the interior of the fixed conductive tube, and the top end of the movable conductive tube and the top end of the fixed conductive tube are connected through a reset spring 1233, and the fixed conductive tube is electrically connected to the analog-to-digital conversion circuit, and the interior of the fixed conductive tube is hollow, and a retaining piece fixedly connected to the top end of the reset spring 1233 is provided on the top of the fixed conductive tube, and the size of the retaining piece is larger than the inner diameter of the fixed conductive tube, and the retaining piece and the fixed conductive tube are welded or threadedly connected. With this structure, the movable conductive tube can elastically expand and contract up and down, so as to better contact with the conductive protrusion.

[0028] One end of the air extraction interface 11 is located on the top surface of the base 1, and the other end is connected to the air pipe on the side of the base 1. The air pipe is convenient for connecting to a vacuum compression bag or a vacuum preservation box. The air pipe is connected to the air extraction interface, so as to facilitate the measurement of air pressure.

[0029] The above implementation modes cannot limit the protection scope of the present invention. The equivalent modifications and changes made by those skilled in the art without departing from the overall concept of the present invention are still within the scope of the present invention.

Claims

1. A pressure measurement and calibration device, characterized in that The invention comprises a base (1), wherein the base (1) is provided with an air extraction interface (11), a vacuum pump (2) covering the air extraction interface (11) is placed on the base (1), a first support rod (12) is provided on the top of the base (1), a support plate (121) is fixedly provided on the first support rod (12), a lifting panel (122) is provided below the support plate (121), a pull rod structure connected to and driving the lifting panel (122) to rise and fall is provided above the support plate (121), a guide rail structure for guiding the moving direction of the lifting panel (122) is provided between the support plate (121) and the lifting panel (122), a vacuum pump driving circuit, a control circuit, a power supply circuit, a switch button (22), and a conductive protrusion (21) are provided on the circuit board on the top of the vacuum pump (2), The conductive protrusion (21) is the air pressure signal output end of the air pressure detection sensor. The vacuum pump (2) is also provided with an air pump. The air suction nozzle at the bottom of the vacuum pump (2) serves as the air inlet of the air pump and is in contact with the air extraction interface (11) to form a closed exhaust channel. The exhaust port of the air pump is in contact with the outside. The detection end of the air pressure detection sensor is located in the exhaust channel. The lifting panel (122) is provided with an air pressure signal acquisition probe (123) that can be in electrical contact with the conductive protrusion (21). The air pressure signal acquisition probe (123) is electrically connected to the control circuit through an analog-to-digital conversion circuit. The control end of the air pump is electrically connected to the control circuit through the air pump drive circuit. The power supply circuit and the switch button are respectively electrically connected to the control circuit.

2. The air pressure measurement calibration device according to claim 1, characterized in that The lever structure comprises a second support rod (125) fixed to the top surface of the support plate (121) and a lever assembly, the lever assembly comprising a hinge seat (3) fixed to the second support rod (125), the hinge seat (3) being hinged to one end of the lever (31), the other end of the lever (31) being hinged to one end of an arc-shaped transmission member (32) and then extending upward to form an operating handle, the other end of the arc-shaped transmission member (32) being hinged to one end of a lifting support rod (33), the other end of the lifting support rod (33) passing through a through hole on the support plate (121) and then being fixedly connected to the top surface of the lifting panel (122).

3. The air pressure measurement calibration device according to claim 2, characterized in that The other end of the lifting support rod (33) is threadedly connected to one end of a nut (34), and the other end of the nut (34) is fixedly connected to the top surface of the lifting panel (122) by glue.

4. The air pressure measurement calibration device according to claim 3, characterized in that The guide rail structure comprises a guide rail bar (1211) fixed to the bottom surface of the support plate (121) and a guide groove on the lifting panel (122); after assembly, the guide rail bar is inserted into the guide groove.

5. The air pressure measurement calibration device according to claim 4, characterized in that The first support rod (12) is provided with an upper positioning block (124) located between the lifting panel (122) and the base (1); the upper positioning block (124) is provided with an upper positioning opening (1241); the base (1) is provided with a lower positioning opening (1242) corresponding to the upper positioning opening; after assembly, the top end of the vacuum pump (2) is located in the upper positioning opening, and the bottom end of the vacuum pump (2) is located in the lower positioning opening.

6. The air pressure measurement calibration device according to claim 5, characterized in that The vacuum pump and the air pressure detection sensor are located in the housing of the vacuum pump, and an elastic air guide ring (4) is provided at the contact point between the vacuum pump (2) suction nozzle and the vacuum interface (11).

7. The air pressure measurement calibration device according to claim 6, characterized in that The air pressure signal acquisition probe (123) comprises a fixed conductive tube (1231) and a movable conductive tube (1232), wherein the fixed conductive tube is fixed to the inner side of the lifting panel (122), the top end of the movable conductive tube extends from the bottom end of the fixed conductive tube into the interior of the fixed conductive tube, the top end of the movable conductive tube and the top end of the fixed conductive tube are connected via a return spring (1233), and the fixed conductive tube is electrically connected to the analog-to-digital conversion circuit.

8. The air pressure measurement calibration device according to claim 7, characterized in that One end of the air extraction interface (11) is located on the top surface of the base (1), and the other end is connected to an air pipe on the side of the base (1), and the air pipe is connected to the air extraction interface.

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