Pneumatic metering pump

Abstract

A pneumatic metering pump, comprising a pump body. The pump body is provided with a liquid inlet, a liquid outlet, and a vent. A liquid storage chamber is further provided in the pump body. When performing a liquid intake operation, air is evacuated through the vent to draw an external liquid into the liquid storage chamber through a liquid inlet; when performing a liquid discharge operation, air is introduced through the vent to press out the liquid in the liquid storage chamber through a liquid outlet. The pneumatic metering pump further comprises a first liquid level detector, and the first liquid level detector is arranged at the inner end of the liquid outlet. When performing the liquid discharge operation, the first liquid level detector is used for determining whether the liquid starts to be discharged. The pneumatic metering pump can improve the accuracy of liquid output metering.

Description

A pneumatic constant displacement pump TECHNICAL FIELD

[0001] The utility model relates to constant displacement pump manufacturing technical field, concretely relates to a pneumatic constant displacement pump. BACKGROUND

[0002] At present, the traditional mechanical pump is generally used to control the transmission of aluminum liquid in the constant displacement furnace, and the starting time of the pump body is often taken as the measurement start time when the transmission amount of the aluminum liquid is measured. However, in actual operation, there is a certain time difference between the start of the pump body and the start of the liquid material output from the liquid outlet. This leads to deviation in the start time of the liquid output measured by the traditional mechanical pump, resulting in low accuracy of the constant displacement measurement, which cannot be applied to high-precision stable liquid transmission. In the casting industry, it will lead to unstable casting liquid delivery, thereby affecting the casting quality.

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

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a pneumatic constant displacement pump, characterized by comprising a pump body, the pump body is provided with a liquid inlet, a liquid outlet and an air vent, and a liquid storage cavity is further arranged in the pump body; when performing liquid inlet operation, the external liquid material is sucked into the liquid storage cavity through the air vent; when performing liquid outlet operation, the liquid material in the liquid storage cavity is pressed out of the liquid outlet through the air inlet; further comprising: a first liquid level detector, the first liquid level detector is arranged at the inner side end of the liquid outlet, and when performing liquid outlet operation, the first liquid level detector is used to judge whether the liquid material starts to be discharged.

[0005] Based on the above structure, in the field of aluminum casting manufacturing, the principle of the pneumatic constant displacement pump is that the pump body is integrally installed in the aluminum liquid pool or the constant displacement furnace, and the liquid outlet is connected to the subsequent equipment. The air pipe connected to the air inlet and the air extraction execution member is installed on the air vent.

[0006] When performing liquid inlet operation, the system controls the air extraction execution member to start, extracts the air in the liquid storage cavity from the air vent, and makes the aluminum liquid outside the pump be pressed into the pump. When the liquid level of the aluminum liquid reaches the preset amount, the system controls the air extraction execution member to stop working.

[0007] When performing liquid outlet operation, the system controls the air inlet execution member to start, and the gas enters the liquid storage cavity from the air vent, and the liquid material is pressed out of the liquid outlet. When the liquid surface contacts the detection position of the first liquid level detector, the system starts timing. After timing for a preset time, the system controls the air inlet execution member to stop working. Thus, the liquid material is quantitatively outputted, the accuracy of the liquid material output is ensured, and finally the quality of the casting is ensured.

[0008] Further, the first liquid level detector detects the bottom of the inner end of the liquid outlet, and the outer end of the liquid outlet is arranged in a whole downward inclined manner. As a preferred solution of the present application, liquid material is delivered to a position higher than the bottom of the liquid outlet, and the delivery of the liquid material from the liquid outlet is based on the premise that the liquid material is delivered to the position higher than the bottom of the liquid outlet. The first liquid level detector detects the bottom of the inner end of the liquid outlet, and the detection position of the first liquid level detector can accurately detect the time when the liquid material starts to be delivered. The liquid material in the liquid outlet after the end of the air inlet can be discharged by gravity, and the residual liquid material in the liquid outlet can prevent the delivery accuracy of the liquid material from being affected.

[0009] Further, the first liquid level detector detects the bottom of the inner end of the liquid outlet, and the outer end of the liquid outlet is arranged in a whole downward inclined manner. As a preferred solution of the present application, liquid material is delivered to a position higher than the bottom of the liquid outlet, and the delivery of the liquid material from the liquid outlet is based on the premise that the liquid material is delivered to the position higher than the bottom of the liquid outlet. The first liquid level detector detects the bottom of the inner end of the liquid outlet, and the detection position of the first liquid level detector can accurately detect the time when the liquid material starts to be delivered. The liquid material in the liquid outlet after the end of the air inlet can be discharged by gravity, and the residual liquid material in the liquid outlet can prevent the delivery accuracy of the liquid material from being affected.

[0010] Further, the first liquid level detector detects the bottom of the inner end of the liquid outlet, and the outer end of the liquid outlet is arranged in a whole downward inclined manner. As a preferred solution of the present application, liquid material is delivered to a position higher than the bottom of the liquid outlet, and the delivery of the liquid material from the liquid outlet is based on the premise that the liquid material is delivered to the position higher than the bottom of the liquid outlet. The first liquid level detector detects the bottom of the inner end of the liquid outlet, and the detection position of the first liquid level detector can accurately detect the time when the liquid material starts to be delivered. The liquid material in the liquid outlet after the end of the air inlet can be discharged by gravity, and the residual liquid material in the liquid outlet can prevent the delivery accuracy of the liquid material from being affected.

[0011] Further, the first liquid level detector detects the bottom of the inner end of the liquid outlet, and the outer end of the liquid outlet is arranged in a whole downward inclined manner. As a preferred solution of the present application, liquid material is delivered to a position higher than the bottom of the liquid outlet, and the delivery of the liquid material from the liquid outlet is based on the premise that the liquid material is delivered to the position higher than the bottom of the liquid outlet. The first liquid level detector detects the bottom of the inner end of the liquid outlet, and the detection position of the first liquid level detector can accurately detect the time when the liquid material starts to be delivered. The liquid material in the liquid outlet after the end of the air inlet can be discharged by gravity, and the residual liquid material in the liquid outlet can prevent the delivery accuracy of the liquid material from being affected.

[0012] Further, the first liquid level detector detects the bottom of the inner end of the liquid outlet, and the outer end of the liquid outlet is arranged in a whole downward inclined manner. As a preferred solution of the present application, liquid material is delivered to a position higher than the bottom of the liquid outlet, and the delivery of the liquid material from the liquid outlet is based on the premise that the liquid material is delivered to the position higher than the bottom of the liquid outlet. The first liquid level detector detects the bottom of the inner end of the liquid outlet, and the detection position of the first liquid level detector can accurately detect the time when the liquid material starts to be delivered. The liquid material in the liquid outlet after the end of the air inlet can be discharged by gravity, and the residual liquid material in the liquid outlet can prevent the delivery accuracy of the liquid material from being affected.

[0013] Further, the pneumatic quantitative pump provided by the application further comprises a second liquid level detector arranged in the liquid storage cavity, which is used to determine whether the liquid material in the liquid storage cavity reaches the preset amount when the liquid feeding operation is performed.

[0014] Further, the pneumatic quantitative pump provided by the application further comprises a third liquid level detector arranged in the liquid storage cavity, wherein the detection point of the third liquid level detector is higher than that of the second liquid level detector.

[0015] Further, the pneumatic quantitative pump provided by the application further comprises a liquid outlet channel communicated with the liquid storage cavity, wherein the liquid outlet is arranged above the communication opening between the liquid outlet channel and the liquid storage cavity, and the first liquid level detector is arranged in the liquid outlet channel; the pneumatic quantitative pump further comprises a driver mounted on the pump body, wherein the driver is in transmission connection with the first liquid level detector; when the liquid outlet operation is performed, the driver is used to lift the first liquid level detector by a preset distance to make the first liquid level detector higher than the liquid level in the liquid outlet channel after the liquid material starts to be discharged by the first liquid level detector.

[0016] Further, the pneumatic quantitative pump provided by the application is characterized in that the air inlet is arranged at the upper end of the liquid storage cavity; the pump body comprises a pump chamber and a pump cover, wherein 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 air inlet is arranged on the pump cover; the liquid outlet channel is in the form of a pipe body and is integrally arranged on the pump cover, and the liquid outlet is arranged on the upper side of the pump cover.

[0017] The above technical scheme can achieve the following beneficial effects: the pneumatic quantitative pump provided by the application is characterized in that when the liquid outlet operation is performed, the system controls the air inlet execution member to start, the gas enters the liquid storage cavity from the air inlet, the liquid material is pressed out from the liquid outlet, the system starts timing when the liquid surface contacts the detection point of the first liquid level detector, and the system controls the air inlet execution member to stop working after the liquid material with the preset time is outputted after timing. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a schematic diagram of the structure of a kind of pneumatic dosing pump described in the embodiment of the application; Fig. 2 is the local enlarged view of the area of circle A in Fig. 1.

[0019] In the figure: 1-pump body; 101-pump storehouse; 102-pump cover; 11-liquid inlet; 111-liquid inlet; 1111-cone hole; 112-limiting stop; 12-liquid outlet; 121-liquid outlet; 13-vent; 14-liquid storage cavity; 2-first liquid level detector; 3-check ball; 4-second liquid level detector; 5-third liquid level detector; 6-driver. DETAILED DESCRIPTION EMBODIMENT

[0020] In combination with the pneumatic dosing pump shown in Fig. 1: including pump body 1, the pump body 1 is provided with liquid inlet 111, liquid outlet 121 and vent 13, the pump body 1 is also provided with liquid storage cavity 14; When performing liquid inlet operation, the external liquid is sucked into the liquid storage cavity 14 through the vent 13; When performing liquid outlet operation, the liquid in the liquid storage cavity 14 is pressed out of the liquid outlet 121 by air inlet through the vent 13; It also includes: first liquid level detector 2, the first liquid level detector 2 is arranged at the inner side end of the liquid outlet 121, when performing liquid outlet operation, the first liquid level detector 2 is used to judge whether the liquid begins to flow out.

[0021] Based on the above structure, in the field of cast aluminum manufacturing, the principle of the pneumatic dosing pump is that the pump body 1 is installed in the aluminum liquid pool or the dosing furnace as a whole, and the liquid outlet 121 is connected to the subsequent equipment. The vent 13 is installed with a gas pipe connected to the air inlet and air extraction execution member.

[0022] When performing liquid inlet operation, the system controls the air extraction execution member (vacuum generator) to start, extracts the air in the liquid storage cavity 14 from the vent 13, so that the aluminum liquid outside the pump is pressed into the pump, and when the liquid level reaches the preset amount, the system controls the air extraction execution member to stop working.

[0023] When performing liquid outlet operation, the system controls the air inlet execution member (air pump) to start, the gas enters the liquid storage cavity 14 from the vent 13, and the liquid is pressed out of the liquid outlet 121, when the liquid surface contacts the detection position of the first liquid level detector 2, the system starts timing, after timing, the system controls the air inlet execution member to stop working after outputting the liquid with the preset time. Thus, the liquid is quantitatively outputted to ensure the precision of liquid output, and finally the quality of castings can be ensured. After performing liquid inlet and liquid outlet operation, the corresponding valve on the vent 13 can be opened to balance the internal pressure of the liquid storage cavity 14 with the outside, so as to avoid affecting the service life of internal components due to pressure change.

[0024] Further, in the 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 arranged in a whole downward inclined manner.

[0025] Liquid material is transported to above the bottom of the liquid outlet 121, which is the premise of the liquid material being 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, which can accurately detect the time when the liquid material starts to be discharged. The liquid material entering the liquid outlet 121 after the end of the air inlet of the air inlet port 13 can be discharged by gravity, preventing the residual liquid material of the liquid outlet 121 from affecting the discharge metering accuracy.

[0026] In combination with FIG. 2, further, in the embodiment, the liquid inlet port 111 is provided with a check device; the check device opens the liquid inlet port 111 when performing a liquid inlet operation; and the check device is used to close the liquid inlet port 111 when performing a liquid outlet operation. This prevents liquid material from being discharged from the liquid inlet port 111 when performing a liquid outlet operation.

[0027] Further, in the embodiment, the check device includes a check ball 3 arranged inside the liquid inlet port 111; the pump body 1 is provided with a liquid inlet channel 11 communicating with the liquid storage cavity 14; the liquid inlet port 111 is arranged at the bottom of the liquid inlet channel 11; the check ball 3 is arranged in the liquid inlet channel 11; the check ball 3 can block the liquid inlet port 111 after falling; and the air inlet port 13 is arranged on the side of the liquid inlet channel 11 away from the liquid inlet port 111. When performing a liquid inlet operation, the check ball 3 rises due to the air extraction of the air inlet port 13, so that the liquid inlet port 111 is opened; and when performing a liquid outlet operation, the air inlet port 13 is subjected to downward pressure due to the air inlet of the air inlet port 13, so that the check ball 3 blocks the liquid inlet port 111.

[0028] Further, in the embodiment, a limiting stop piece 112 is arranged above the check ball 3 in the liquid inlet channel 11; and a through hole is arranged on the limiting stop piece 112. The limiting stop piece 112 is used to prevent the check ball 3 from moving out of position in the liquid inlet channel 11 when performing a liquid inlet operation, so that the check ball 3 cannot fall on the liquid inlet port 111 when being reset; and the through hole on the limiting stop piece 112 is used to pass through liquid material.

[0029] Further, in the embodiment, a tapered hole 1111 is arranged on the end of the liquid inlet port 111 close to the check ball 3; the radial dimension of the upper end of the tapered hole 1111 is greater than that of the lower end; and the lower end of the tapered hole 1111 communicates with the liquid inlet port 111. The tapered hole 1111 realizes the centering of the falling check ball 3 through the inner wall, so as to ensure that the check ball 3 can fall above the liquid inlet port 111 after falling, so as to block the liquid inlet port 111.

[0030] Further, the second liquid level detector 4 is arranged in the liquid storage cavity 14, and is used to determine whether the liquid in the liquid storage cavity 14 reaches the preset amount during the liquid feeding operation. When the liquid level in the liquid storage cavity 14 reaches the detection point of the second liquid level detector 4 during the liquid feeding operation, 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 cavity 14 reaches the preset amount, and then the liquid feeding operation is terminated.

[0031] Further, the third liquid level detector 5 is arranged in the liquid storage cavity 14, and the detection point of the third liquid level detector 5 is higher than that of the second liquid level detector 4. The third liquid level detector 5 is used to prevent the liquid in the liquid storage cavity 14 from overflowing during the liquid feeding operation when the second liquid level detector 4 fails.

[0032] Further, the liquid outlet channel 12 is arranged in the pump body 1, and the bottom of the liquid outlet channel 12 is communicated with the liquid storage cavity 14. The liquid outlet 121 is arranged above the communication port between the liquid outlet channel 12 and the liquid storage cavity 14, and the first liquid level detector 2 is arranged in the liquid outlet channel 12. The driver 6 is arranged outside the pump body 1, and is in transmission connection with the first liquid level detector 2. During the liquid discharging operation, the driver 6 is used to lift the first liquid level detector 2 by a preset distance to make the first liquid level detector 2 higher than the liquid level in the liquid outlet channel 12 after the liquid discharging starts, so as to prevent the detection end of the first liquid level detector 2 from being soaked in the liquid during the liquid discharging process, and affect the service life of the first liquid level detector 2.

[0033] Further, the vent hole 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 cavity 14 is arranged in the pump chamber 101, and the pump cover 102 is arranged at the upper end of the pump chamber 101. The vent hole 13 is arranged on the pump cover 102. The liquid outlet channel 12 is in the form of a pipe body, and is integrally arranged on the pump cover 102. The liquid outlet 121 is arranged on the upper side of the pump cover 102.

[0034] In the embodiment, the liquid material delivered is aluminum liquid, 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 corresponding power supply polarity, and a hetero electrode (not shown) with a different polarity from the three liquid level detectors is further arranged in the pump body 1. During detection, the hetero electrode is in the aluminum liquid, and when the aluminum liquid surface contacts the three liquid level detectors, 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 into the liquid outlet channel 12 from top to bottom.

[0035] The technical principles of the utility model are described above in combination with specific embodiments, and these descriptions are only for explaining the principles of the utility model, and cannot be interpreted as limiting the protection scope of the utility model in any way. Based on the explanations herein, other specific embodiments of the utility model can be conceived by those skilled in the art without creative labor, and these embodiments will all fall within the protection scope of the utility model.

Claims

1. A gas operated dosing pump, characterized by: The pump body (1) is provided with a liquid inlet (111), a liquid outlet (121) and a vent (13), and a liquid storage cavity (14) is further arranged in the pump body (1); When the liquid inlet operation is performed, the external liquid is sucked into the liquid storage cavity (14) through the vent (13); When the liquid outlet operation is performed, the liquid in the liquid storage cavity (14) is pressed out of the liquid outlet (121) through the vent (13); Further comprising: A first liquid level detector (2) is arranged at the inner side end of the liquid outlet (121), and the first liquid level detector (2) is used to determine whether the liquid starts to be discharged when the liquid outlet operation is performed.

2. A gas dynamic dosing 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 side end of the liquid outlet (121); The outer end of the liquid outlet (121) is arranged in a whole downward inclined manner.

3. A gas dynamic dosing pump according to claim 1, characterized in that: A check device is arranged at the liquid inlet (111); the check device opens the liquid inlet (111) when the liquid inlet operation is performed; and the check device is used to close the liquid inlet (111) when the liquid outlet operation is performed.

4. A gas dynamic dosing pump according to claim 3, characterized in that: The check device comprises a check ball (3) arranged at the inner side of the liquid inlet (111), the pump body (1) is provided with a liquid inlet channel (11) in communication with the liquid storage cavity (14), the liquid inlet (111) is arranged at the bottom of the liquid inlet channel (11), the check ball (3) is arranged in the liquid inlet channel (11), the check ball (3) can block the liquid inlet (111) after falling, and the vent (13) is arranged at the side of the liquid inlet channel (11) away from the liquid inlet (111).

5. A gas dynamic dosing pump according to claim 4, characterized in that: A limiting stop piece (112) is arranged above the check ball (3) in the liquid inlet channel (11), and a through hole is arranged on the limiting stop piece (112).

6. A gas dynamic dosing pump according to claim 4, characterized in that: A tapered hole (1111) is arranged at the end of the liquid inlet (111) close to the check ball (3), the radial dimension of the upper end of the tapered hole (1111) is greater than that of the lower end, and the lower end of the tapered hole (1111) is in communication with the liquid inlet (111).

7. A gas dynamic dosing pump according to claim 1, characterized in that: Further comprising a second liquid level detector (4) arranged in the liquid storage cavity (14), which is used to determine whether the liquid in the liquid storage cavity (14) reaches a preset amount when the liquid inlet operation is performed.

8. A gas dynamic dosing pump according to claim 7, characterized in that: Further comprising a third liquid level detector (5) arranged in the liquid storage cavity (14), and the detection point of the third liquid level detector (5) is higher than that of the second liquid level detector (4).

9. A gas dynamic dosing pump according to claim 1, characterized in that: Further comprising a liquid outlet channel (12) in communication with the liquid storage cavity (14), the liquid outlet (121) is arranged above the communication port of the liquid outlet channel (12) and the liquid storage cavity (14), and the first liquid level detector (2) is arranged in the liquid outlet channel (12); Further comprising a driver (6) mounted outside the pump body (1), and the driver (6) is in transmission connection with the first liquid level detector (2), When the liquid discharging operation is performed, the first liquid level detector (2) is used to determine that the liquid material starts to be discharged, and then 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 discharging channel (12).

10. A gas dynamic dosing pump according to claim 1, characterized in that: The vent (13) is arranged on 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 cavity (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 discharging channel (12) is in the form of a pipe body and is integrally arranged on the pump cover (102), and the liquid discharging opening (121) is arranged on the upper side of the pump cover (102).

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