Pneumatic metering pump

Abstract

The utility model relates to the technical field of metering pump manufacturing, in particular to a pneumatic metering pump which comprises a pump body, a liquid inlet, a liquid outlet and an air vent are arranged on the pump body, and a liquid storage cavity is further arranged in the pump body. When liquid feeding operation is executed, air is pumped through the air vent, and external liquid materials are sucked into the liquid storage cavity from the liquid inlet; when liquid discharging operation is executed, air is fed through the air vent to press out liquid in the liquid storage cavity from the liquid outlet; the device further comprises a first liquid level detector, the first liquid level detector is arranged at the inner side end of the liquid outlet, and when the liquid outlet operation is executed, the first liquid level detector is used for judging whether the liquid starts to be discharged or not. And the metering precision of the liquid material output quantity can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pump manufacturing, in particular to a pneumatic metering pump. Background Art

[0002] At present, the dosing furnace generally uses traditional mechanical pumps to control the transmission of aluminum liquid. When measuring the transmission volume of aluminum liquid, the time when the pump body is started is often used as the measurement start time. In actual operation, there is a certain time difference from the start of the pump body to the start of the liquid discharge from the liquid outlet. This leads to a deviation in the liquid discharge start time measured by the traditional mechanical pump, resulting in low quantitative measurement accuracy and cannot be applied to high-precision stable infusion. In the foundry industry, it will lead to unstable casting liquid delivery, thus affecting the casting quality. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a pneumatic metering pump, which can improve the accuracy of metering the output of liquid materials.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A pneumatic quantitative pump, characterized in that it comprises a pump body, the pump body is provided with a liquid inlet, a liquid outlet and a vent, and the pump body is also provided with a liquid storage cavity;

[0006] When performing the liquid inlet operation, air is sucked through the vent to suck the external liquid into the liquid storage cavity from the liquid inlet; when performing the liquid outlet operation, air is sucked through the vent to press the liquid in the liquid storage cavity out from the liquid outlet;

[0007] It also includes: a first liquid level detector, which is arranged at the inner side of the liquid outlet. When performing the liquid discharge operation, the first liquid level detector is used to determine whether the liquid material starts to discharge.

[0008] Based on the above structure, in the field of aluminum casting, the principle of the pneumatic quantitative pump is as follows: the pump body is installed in an aluminum liquid pool or a quantitative furnace, the liquid outlet is connected to subsequent equipment, and an air pipe is installed on the vent to connect with the air intake and exhaust actuators.

[0009] When performing the liquid filling operation, the system controls the vacuum actuator to start, extracts the air in the liquid storage chamber from the vent, and presses the aluminum liquid outside the pump into the pump. When the aluminum liquid level reaches the preset amount, the system controls the vacuum actuator to stop working.

[0010] When the liquid is discharged, the system controls the air intake actuator to start, the gas enters the liquid storage cavity from the air vent, and the liquid is pressed out from the liquid outlet. When the liquid surface contacts the detection position of the first liquid level detector, the system starts timing. After the timing is over, the system controls the air intake actuator to stop working after the liquid is continuously output for a preset time. This achieves quantitative output of liquid to ensure the accuracy of liquid output and ultimately the quality of castings.

[0011] Furthermore, in the pneumatic metering pump described in the present application, the detection position of the first liquid level detector corresponds to the bottom of the inner end of the liquid outlet;

[0012] The outer end of the liquid outlet is tilted downward as a whole. As a preferred solution of the present application, the liquid is transported to a level higher than the bottom of the liquid outlet as a prerequisite for the liquid to be discharged from the liquid outlet. The detection position of the first liquid level detector corresponds to the bottom of the inner end of the liquid outlet, and can accurately detect the time when the liquid starts to discharge. After the air intake at the vent end is terminated, the liquid entering the liquid outlet can be discharged by its own weight, preventing the residual liquid at the liquid outlet from affecting the liquid discharge metering accuracy.

[0013] Furthermore, in the pneumatic metering pump described in the present application, a check device is provided at the liquid inlet; when performing a liquid inlet operation, the check device opens the liquid inlet; when performing a liquid discharge operation, the check device is used to close the liquid inlet. As a preferred embodiment of the present application, the liquid material is prevented from being discharged from the liquid inlet when performing a liquid discharge operation.

[0014] Furthermore, in the pneumatic metering pump described in the present application, the non-return device includes a non-return ball arranged on the inner side of the liquid inlet, the pump body is provided with a liquid inlet channel connected to the liquid storage chamber, the liquid inlet is arranged at the bottom of the liquid inlet channel, the non-return ball is arranged in the liquid inlet channel, the non-return ball can block the liquid inlet after falling, and the air vent is arranged on the side of the liquid inlet channel away from the liquid inlet. As a preferred embodiment of the present application, when performing the liquid inlet operation, the non-return ball rises due to the air vent being evacuated, so that the liquid inlet is opened; when performing the liquid discharge operation, the air vent is subjected to downward pressure due to the air inlet, so that the non-return ball blocks the liquid inlet.

[0015] Furthermore, in the pneumatic metering pump described in the present application, a limit stopper is provided in the liquid inlet passage corresponding to the upper part of the check ball, and a through hole is provided on the limit stopper. As a preferred solution of the present application, the limit stopper is used to prevent the check ball from moving too far in the liquid inlet passage during the liquid inlet operation, so that it cannot fall on the liquid inlet port when resetting, and the through hole on the limit stopper is used to pass the liquid material.

[0016] Furthermore, in the pneumatic metering pump described in the present application, a conical hole is provided on the liquid inlet near the check ball, the radial dimension of the upper end of the conical hole is larger than that of the lower end, and the lower end of the conical hole is connected to the liquid inlet. As a preferred embodiment of the present application, the conical hole realizes the centering of the falling check ball through the inner wall, ensuring that the check ball can fall above the liquid inlet after falling to block the liquid inlet.

[0017] Furthermore, the pneumatic metering pump described in the present application further includes a second liquid level detector, which is disposed in the liquid storage chamber and is used to determine whether the liquid in the liquid storage chamber has reached a preset amount when performing a liquid filling operation. As a preferred embodiment of the present application, when performing a liquid filling operation, when the liquid level in the liquid storage chamber reaches the detection point of the second liquid level detector, the second liquid level detector sends a signal to the control system, and the control system determines that the liquid in the liquid storage chamber has reached a preset amount, and then terminates the liquid filling operation.

[0018] Furthermore, the pneumatic metering pump described in the present application further includes a third liquid level detector, which is arranged in the liquid storage cavity, and the detection point of the third liquid level detector is higher than the detection point of the second liquid level detector. As a preferred embodiment of the present application, the third liquid level detector is used to prevent the liquid in the liquid storage cavity from overflowing when the liquid filling operation is performed after the failure of the second liquid level detector.

[0019] Furthermore, the pneumatic metering pump described in the present application further includes a liquid outlet channel, the liquid outlet channel is connected to the liquid storage chamber, the liquid outlet is arranged above the communication port between the liquid outlet channel and the liquid storage chamber, and the first liquid level detector is arranged in the liquid outlet channel;

[0020] The pump also includes a driver, which is mounted outside the pump body and is in transmission connection with the first liquid level detector.

[0021] When performing the liquid discharge operation, after the first liquid level detector determines that the liquid material starts to discharge, the driver is used to lift the first liquid level detector by a preset distance so that the first liquid level detector is higher than the liquid level in the liquid discharge channel. As a preferred solution of the present application, it is prevented that during the liquid discharge process, the detection end of the first liquid level detector is immersed in the liquid material, which affects the service life of the first liquid level detector.

[0022] Furthermore, in the pneumatic metering pump described in the present application, the vent is arranged at the upper end of the liquid storage chamber;

[0023] The pump body comprises a pump chamber and a pump cover, the liquid storage cavity is arranged in the pump chamber, the pump cover is arranged at the upper end of the pump chamber, and the vent is arranged on the pump cover;

[0024] The liquid outlet channel is in the form of a tube body, which is integrally installed on the pump cover, and the liquid outlet is arranged on the upper side of the pump cover.

[0025] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0026] The utility model provides a pneumatic quantitative pump. When the liquid discharge operation is performed, the system controls the air intake actuator to start, the gas enters the liquid storage cavity from the air vent, and the liquid is pressed out from the liquid outlet. When the liquid surface contacts the detection position of the first liquid level detector, the system starts timing. After the timing, after the liquid is continuously output for a preset time, the system controls the air intake actuator to stop working. Thus, quantitative output of liquid is achieved to ensure the accuracy of liquid output, and ultimately the quality of castings can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a pneumatic metering pump according to an embodiment of the present application;

[0028] Figure 2 for Figure 1 A partial enlarged view of the area in the middle circle A.

[0029] In the figure: 1-pump body; 101-pump chamber; 102-pump cover; 11-liquid inlet; 111-liquid inlet; 1111-conical hole; 112-limit stopper; 12-liquid outlet channel; 121-liquid outlet; 13-vent; 14-liquid storage chamber; 2-first liquid level detector; 3-check ball; 4-second liquid level detector; 5-third liquid level detector; 6-driver. DETAILED DESCRIPTION Example

[0030] Combination Figure 1 A pneumatic metering pump shown includes a pump body 1, the pump body 1 is provided with a liquid inlet 111, a liquid outlet 121 and a vent 13, and the pump body 1 is also provided with a liquid storage cavity 14;

[0031] When performing the liquid inlet operation, the external liquid is sucked into the liquid storage chamber 14 from the liquid inlet 111 by suction through the vent 13;

[0032] When the liquid discharge operation is performed, air is introduced through the vent 13 to press the liquid in the liquid storage chamber 14 out from the liquid outlet 121;

[0033] Also includes:

[0034] The first liquid level detector 2 is arranged at the inner side of the liquid outlet 121. When performing the liquid discharge operation, the first liquid level detector 2 is used to determine whether the liquid material starts to discharge.

[0035] Based on the above structure, in the field of aluminum casting, the pneumatic quantitative pump has the following principle: the pump body 1 is installed in a liquid aluminum pool or a quantitative furnace, and the liquid outlet 121 is connected to subsequent equipment. The vent 13 is equipped with an air pipe connected to the air intake and exhaust actuators.

[0036] When performing the liquid filling operation, the system controls the vacuum actuator (vacuum generator) to start, and extracts the air in the liquid storage chamber 14 from the vent 13, so that the aluminum liquid outside the pump is pressed into the pump. When the aluminum liquid level reaches a preset amount, the system controls the vacuum actuator to stop working.

[0037] When performing the liquid discharge operation, the system controls the air intake actuator (air pump) to start, the gas enters the liquid storage chamber 14 from the air vent 13, and the liquid is pressed out from the liquid outlet 121. When the liquid surface contacts the detection position of the first liquid level detector 2, the system starts timing. After the timing, after the liquid is continuously output for a preset time, the system controls the air intake actuator to stop working. Thereby, the quantitative output of liquid is achieved to ensure the accuracy of the liquid output, and finally the quality of the casting can be guaranteed. After completing the liquid inlet and outlet operations, the corresponding valve on the air vent 13 can be opened to achieve the balance of the air pressure in the liquid storage chamber 14 with the outside world, so as to avoid the service life of the internal components being affected by pressure changes.

[0038] Furthermore, in this embodiment, the detection position of the first liquid level detector 2 corresponds to the bottom of the inner end of the liquid outlet 121; the outer end of the liquid outlet 121 is tilted downward as a whole.

[0039] The liquid is transported to a level higher than the bottom of the liquid outlet 121, which is a prerequisite for the liquid to be discharged from the liquid outlet 121. The detection position of the first liquid level detector 2 corresponds to the bottom of the inner end of the liquid outlet 121, and can accurately detect the time when the liquid starts to discharge. After the air intake at the end of the vent 13 is terminated, the liquid entering the liquid outlet 121 can be discharged by its own weight, preventing the residual liquid in the liquid outlet 121 from affecting the liquid discharge metering accuracy.

[0040] Combination Figure 2 As shown, further, in this embodiment, a check device is provided at the liquid inlet 111; when performing the liquid inlet operation, the check device opens the liquid inlet 111; when performing the liquid discharge operation, the check device is used to close the liquid inlet 111, so as to prevent the liquid from being discharged from the liquid inlet 111 when performing the liquid discharge operation.

[0041] Furthermore, in this embodiment, the non-return device includes a non-return ball 3 arranged inside the liquid inlet 111, a liquid inlet channel 11 connected to the liquid storage chamber 14 is arranged inside the pump body 1, the liquid inlet 111 is arranged at the bottom of the liquid inlet channel 11, the non-return ball 3 is arranged inside the liquid inlet channel 11, and the non-return ball 3 can block the liquid inlet 111 after falling, and the air vent 13 is arranged on the side of the liquid inlet channel 11 away from the liquid inlet 111. When performing the liquid inlet operation, due to the air vent 13 sucking air, the non-return ball 3 rises, so that the liquid inlet 111 is opened; when performing the liquid discharge operation, due to the air inlet 13 sucking air, the air vent 13 is subjected to downward pressure, so that the non-return ball 3 blocks the liquid inlet 111.

[0042] Furthermore, in this embodiment, a limit stopper 112 is provided in the liquid inlet channel 11 above the check ball 3, and a through hole is provided in the limit stopper 112. The limit stopper 112 is used to prevent the check ball 3 from moving too far in the liquid inlet channel 11 during the liquid inlet operation, so that it cannot fall on the liquid inlet port 111 when resetting, and the through hole in the limit stopper 112 is used to pass the liquid.

[0043] Furthermore, in this embodiment, a conical hole 1111 is provided on the liquid inlet 111 near the check ball 3, the radial dimension of the upper end of the conical hole 1111 is larger than that of the lower end, and the lower end of the conical hole 1111 is connected to the liquid inlet 111. The conical hole 1111 realizes the centering of the falling check ball 3 through the inner wall, ensuring that the check ball 3 can fall above the liquid inlet 111 after falling, so as to block the liquid inlet 111.

[0044] Furthermore, in this embodiment, a second liquid level detector 4 is further included, which is disposed in the liquid storage chamber 14 and is used to determine whether the liquid in the liquid storage chamber 14 has reached a preset amount when performing the liquid feeding operation. When performing the liquid feeding operation, when the liquid level in the liquid storage chamber 14 reaches the detection point of the second liquid level detector 4, the second liquid level detector 4 sends a signal to the control system, and the control system determines that the liquid in the liquid storage chamber 14 has reached a preset amount, and then terminates the liquid feeding operation.

[0045] Furthermore, in this embodiment, a third liquid level detector 5 is further included, and the third liquid level detector 5 is disposed in the liquid storage chamber 14, and the detection point of the third liquid level detector 5 is higher than the detection point of the second liquid level detector 4. The third liquid level detector 5 is used to prevent the liquid in the liquid storage chamber 14 from overflowing when the liquid filling operation is performed after the second liquid level detector 4 fails.

[0046] Furthermore, in this embodiment, it also includes a liquid outlet channel 12, the bottom of which is connected to the liquid storage chamber 14, the liquid outlet port 121 is arranged above the connecting port between the liquid outlet channel 12 and the liquid storage chamber 14, and the first liquid level detector 2 is arranged in the liquid outlet channel 12; it also includes a driver 6, which is installed outside the pump body 1, and the driver 6 is connected to the first liquid level detector 2 in a transmission manner. When performing the liquid discharge operation, after the first liquid level detector 2 determines that the liquid material starts to discharge, the driver 6 is used to lift the first liquid level detector 2 by a preset distance so that the first liquid level detector 2 is higher than the liquid level in the liquid outlet channel 12. This prevents the detection end of the first liquid level detector 2 from being immersed in the liquid material during the liquid discharge process, thereby affecting the service life of the first liquid level detector 2.

[0047] Furthermore, in this embodiment, the vent 13 is disposed at the upper end of the liquid storage chamber 14;

[0048] The pump body 1 includes a pump chamber 101 and a pump cover 102, the liquid storage chamber 14 is arranged in the pump chamber 101, the pump cover 102 is arranged on the upper end of the pump chamber 101, and the vent 13 is arranged on the pump cover 102;

[0049] The liquid outlet channel 12 is in the form of a tube, which is integrally installed on the pump cover 102 , and the liquid outlet 121 is arranged on the upper side of the pump cover 102 .

[0050] In this embodiment, the liquid material being transported is aluminum liquid, and the first liquid level detector 2, the second liquid level detector 4 and the third liquid level detector 5 are all liquid level electrodes, i.e., electrode-type liquid level switches. Specifically, the first liquid level detector 2, the second liquid level detector 4 and the third liquid level detector 5 have the same power polarity, and an opposite polarity electrode (not shown) with a polarity different from that of the above three liquid level detectors is also provided in the pump body 1. During detection, the opposite polarity electrode is in the aluminum liquid, and the aluminum liquid surface contacts the above three liquid level detectors, then the corresponding detection circuit generates a loop to send an input signal to the controller. The driver 6 is a linear drive cylinder, the driver 6 is mounted on the pump cover 102, the first liquid level detector 2 is mounted on the telescopic rod of the driver 6, and the first liquid level detector 2 penetrates the liquid outlet channel 12 from top to bottom.

[0051] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanation here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A pneumatic metering pump, characterized in that: It comprises a pump body (1), wherein the pump body (1) is provided with a liquid inlet (111), a liquid outlet (121) and a vent (13), and the pump body (1) is also provided with a liquid storage cavity (14); When performing the liquid inlet operation, air is drawn through the vent (13) to suck external liquid material from the liquid inlet (111) into the liquid storage chamber (14); When the liquid discharge operation is performed, air is introduced through the vent (13) to press the liquid in the liquid storage chamber (14) out from the liquid outlet (121); Also includes: A first liquid level detector (2), the first liquid level detector (2) being arranged at the inner side end of the liquid outlet (121), and when performing a liquid discharge operation, the first liquid level detector (2) is used to determine whether liquid material has started to discharge.

2. A pneumatic metering pump according to claim 1, characterized in that: The detection position of the first liquid level detector (2) corresponds to the bottom of the inner end of the liquid outlet (121); The outer end of the liquid outlet (121) is arranged to be tilted downward as a whole.

3. A pneumatic metering pump according to claim 1, characterized in that: A non-return device is provided at the liquid inlet (111); when performing a liquid inlet operation, the non-return device opens the liquid inlet (111); when performing a liquid outlet operation, the non-return device is used to close the liquid inlet (111).

4. A pneumatic metering pump according to claim 3, characterized in that: The non-return device comprises a non-return ball (3) arranged inside the liquid inlet (111); a liquid inlet channel (11) communicating with the liquid storage chamber (14) is arranged inside the pump body (1); the liquid inlet (111) is arranged at the bottom of the liquid inlet channel (11); the non-return ball (3) is arranged in the liquid inlet channel (11); the non-return ball (3) can block the liquid inlet (111) after falling; and the vent (13) is arranged on a side of the liquid inlet channel (11) away from the liquid inlet (111).

5. A pneumatic metering pump according to claim 4, characterized in that: A position-limiting stopper (112) is provided in the liquid inlet channel (11) above the check ball (3), and a through hole is provided on the position-limiting stopper (112).

6. A pneumatic metering pump according to claim 4, characterized in that: A conical hole (1111) is provided on one end of the liquid inlet (111) near the check ball (3); the radial dimension of the upper end of the conical hole (1111) is larger than that of the lower end; and the lower end of the conical hole (1111) is in communication with the liquid inlet (111).

7. A pneumatic metering pump according to claim 1, characterized in that: It also includes a second liquid level detector (4), which is arranged in the liquid storage chamber (14) and is used to determine whether the liquid in the liquid storage chamber (14) has reached a preset amount when performing a liquid filling operation.

8. A pneumatic metering pump according to claim 7, characterized in that: It also comprises a third liquid level detector (5), the third liquid level detector (5) being arranged in the liquid storage cavity (14), the detection point of the third liquid level detector (5) being higher than the detection point of the second liquid level detector (4).

9. A pneumatic metering pump according to claim 1, characterized in that: It also comprises a liquid outlet channel (12), the liquid outlet channel (12) being in communication with the liquid storage chamber (14), the liquid outlet (121) being arranged above the communication port between the liquid outlet channel (12) and the liquid storage chamber (14), and the first liquid level detector (2) being arranged in the liquid outlet channel (12); The pump also comprises a driver (6), wherein the driver (6) is mounted outside the pump body (1), and the driver (6) is in transmission connection with the first liquid level detector (2). When performing a liquid discharge operation, after the first liquid level detector (2) determines that liquid material has begun to discharge, the driver (6) is used to lift the first liquid level detector (2) by a preset distance, so that the first liquid level detector (2) is higher than the liquid level in the liquid discharge channel (12).

10. A pneumatic metering pump according to claim 9, characterized in that: The vent (13) is arranged at the upper end of the liquid storage cavity (14); The pump body (1) comprises a pump chamber (101) and a pump cover (102); the liquid storage chamber (14) is arranged in the pump chamber (101); the pump cover (102) is arranged on the upper end of the pump chamber (101); and the vent (13) is arranged on the pump cover (102); The liquid outlet channel (12) is in the form of a tube, and is integrally installed on the pump cover (102); the liquid outlet (121) is arranged on the upper side of the pump cover (102).

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