Pneumatic constant flow pump with liquid self-sealing outlet tube

Abstract

The application discloses a kind of air pressure type quantitative aluminum outlet pump with liquid self-sealing liquid outlet pipe, including quantitative pump body, the bottom of quantitative pump body is provided with liquid inlet cavity, and the top of liquid inlet cavity is provided with liquid inlet one-way valve between liquid inlet pipe, quantitative pump body top is provided with gas circuit connector, liquid outlet pipe is set as serpentine coil pipe, and liquid outlet pipe includes mutually communicating liquid inlet pipe body, sealed straight pipe body and liquid lifting pipe body, sealed straight pipe body is arranged in the middle of liquid outlet pipe, and the top height of sealed straight pipe is higher than the top end height of liquid suction pipe, the present application is provided with special shape liquid outlet pipe, realizes the liquid self-sealing of liquid outlet pipe in the liquid inlet process of quantitative pump body, cancels plug valve at liquid outlet pipe, and does not need control and detection, is not easy to accumulate slag and block, under the premise of guaranteeing aluminium water quality, greatly improve the degree of automation of aluminum alloy die casting, can effectively reduce manual labor, reduce manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of quantitative aluminum dispensing pump equipment, and in particular to a pneumatic quantitative aluminum dispensing pump with a liquid self-sealing outlet pipe. Background Technology

[0002] The aluminum alloy forming industry has been rapidly accepted by the market due to its intelligent, flexible, and highly automated characteristics, and is widely used in high-value-added intelligent production lines such as engine blocks and cylinder heads. Existing methods for quantitative aluminum extraction mainly include spoon-feeding, pneumatic metering, and mechanical metering pumps. Spoon-feeding has advantages such as low operating costs (including low manufacturing and consumable costs) and high metering accuracy. However, it suffers from poor water quality because it only extracts the upper layer of molten aluminum, which contains a significant amount of aluminum dross; its operation is limited by circuitry and safety considerations, resulting in long cycle times; significant temperature drop due to the lack of heating and insulation during transport; and high heat consumption because the extraction port cannot be sealed. Mechanical metering pumps offer high water quality, but suffer from very low extraction accuracy and high rotor costs as a consumable. Pneumatic metering pumps are widely used due to their high water quality and the fact that they extract the lower and middle layers of molten aluminum from the holding furnace, resulting in less aluminum dross.

[0003] Existing pneumatic metering pumps such as Figure 1 As shown, the pump includes a metering pump body 5. A pump cover 2 and a flow channel riser pipe 4 are located on the top of the metering pump body 5. A suction pipe 11 and an outlet pipe 3 are installed inside the metering pump body 5. One end of the outlet pipe 3 is located at the bottom of the metering pump body 5, and the other end of the outlet pipe 3 is connected to the bottom end of the flow channel riser pipe 4. The pump cover 2 is used to seal the metering pump body 5, making it a pressure vessel. The metering pump body 5 contains the suction pipe 11 and the outlet pipe 3. The outlet pipe 3 is a straight pipe and is typically controlled by a built-in valve body 33. One end of the outlet pipe 3 is located at the bottom of the metering pump body 5, and the other end of the outlet pipe 3 is connected to the bottom end of the flow channel riser pipe 4. Molten aluminum enters the body through the suction pipe 11 and flows through the outlet pipe 3 and the flow channel riser pipe 4 into the die-casting machine. Existing pneumatic metering pumps have the following drawbacks: 1. The valve body inside the outlet pipe often uses a sealing ball and sealing plunger structure. The sealing ball can leak due to slag buildup affecting the sealing surface; while the sealing plunger requires external power to drive it, and the power rod is located outside the pump. Leakage at the sealing position of the rod is prone to aluminum leakage, posing a safety risk. Furthermore, the presence of the plunger valve results in a high failure rate in the outlet pipe, making it difficult to maintain and increasing operating costs. 2. The valve body inside the outlet pipe is located at the bottom of the pump as an aluminum outlet sealing structure, which is prone to sludge accumulation and blockage, and is difficult to maintain.

[0004] 3. Due to the difficulty in maintaining the quality of molten aluminum during the process of transporting it from the holding furnace to the die-casting machine, the temperature drop of the molten aluminum is large, the aluminum output accuracy is low, and the output volume is small. It is difficult to cooperate with the die-casting machine to form a highly automated production line. Especially in highly automated industries such as automobiles, this greatly affects production efficiency and increases manufacturing costs. Summary of the Invention

[0005] To address the problems mentioned in the background section regarding existing pneumatic metering pumps, such as the high failure rate and difficulty in maintaining the outlet pipe due to the valve body inside the outlet pipe; the valve body being located at the bottom of the pump as an aluminum outlet sealing structure, making it prone to slag accumulation and blockage, and difficult to maintain; and the difficulty in maintaining the quality of molten aluminum and the large temperature drop of molten aluminum during the transportation of molten aluminum from the holding furnace to the die-casting machine, a pneumatic metering aluminum dispensing pump with a self-sealing liquid outlet pipe is provided. This pump includes a metering pump body, with a pump cover and a flow channel riser pipe on the top of the pump body. The metering pump body contains... It is equipped with a suction pipe and a discharge pipe. One end of the discharge pipe is located at the bottom of the metering pump body, and the other end of the discharge pipe is connected to the bottom end of the riser pipe of the flow channel. The bottom of the metering pump body is provided with a liquid inlet chamber. A liquid inlet check valve is provided between the top of the liquid inlet chamber and the liquid inlet pipe. A gas connector is provided at the top of the metering pump body. The discharge pipe is a serpentine coil. The discharge pipe includes an interconnected liquid inlet pipe body, a sealed straight pipe body, and a riser pipe body. The sealed straight pipe body is located in the middle of the discharge pipe, and the top height of the sealed straight pipe body is higher than the top height of the suction pipe.

[0006] The liquid outlet pipe can be designed as an integrated structure or a separate structure.

[0007] The split-type liquid outlet pipe has an inlet pipe and a riser pipe, which are both straight pipes. The top of the inlet pipe is connected to the top of the sealed straight pipe via an upper connector, and the bottom of the sealed straight pipe is connected to the bottom of the riser pipe via a lower connector.

[0008] The upper connector and the lower connector are respectively set as connecting bends. When the connecting bend is the upper connector, its two ends are connected to the ends of the liquid inlet pipe and the sealed straight pipe respectively. When the connecting bend is the lower connector, its two ends are connected to the ends of the sealed straight pipe and the riser pipe respectively.

[0009] The connecting bend can be set to a 90° bend or a 180° bend.

[0010] The upper and lower connectors are set as square boxes, and a liquid channel is provided inside the square box. The two ends of the liquid channel are provided with pipe joints. When the square box is the upper connector, it is connected to the end of the liquid inlet pipe and the end of the sealing straight pipe respectively through the pipe joints. When the square box is the lower connector, it is connected to the end of the sealing straight pipe and the end of the riser pipe respectively through the pipe joints.

[0011] A filter plate assembly is installed on the outside of the liquid inlet chamber, and the filter plate assembly is fixed to the outside of the metering pump body by a filter plate clamping assembly.

[0012] A pump cover clamping assembly is provided on the outside of the pump cover, and a riser pipe clamping assembly is provided on the pump cover outside the riser pipe of the flow channel. The middle part of the outlet pipe is fixed to the mounting plate by a coil hanger. The mounting plate is fixed to the top of the pump cover by a coil cover. A coil prefabricated clamping assembly is provided on the pump cover outside the coil cover.

[0013] The metering pump body is equipped with an immersion electric heater, a thermocouple is installed on the top of the metering pump body, and a heating and insulation jacket is installed on the outside of the flow channel riser pipe.

[0014] The liquid inlet check valve includes a conical cavity and a liquid suction sealing ball, with the liquid suction sealing ball disposed within the conical cavity.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: This invention features a specially shaped outlet pipe that enables the liquid in the outlet pipe to self-seal during the liquid inlet process of the metering pump body. The plug valve at the outlet pipe is eliminated, and no control or detection is required. It is also less prone to slag accumulation and blockage. While ensuring the quality of molten aluminum, it greatly improves the automation level of aluminum alloy die casting, effectively reduces manual labor, and lowers manufacturing costs. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the existing technology structure; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention in Embodiment 1; Figure 3 This is a side view of the present invention in Embodiment 1; Figure 4 This is another side view of the present invention in Embodiment 1; Figure 5 In Example 1 Figure 4 Sectional view along the FF direction; Figure 6 In Example 1 Figure 3 Sectional view along the EE direction; Figure 7 This is a schematic diagram of the liquid outlet pipe structure in Example 2; Figure 8 This is a schematic diagram of the liquid outlet pipe structure in Example 3; Figure 9 This is a schematic diagram of the liquid outlet pipe structure in Example 4. In the diagram: 1. Main cover of the insulation furnace; 2. Pump cover; 3. Liquid outlet pipe; 4. Flow channel riser pipe; 5. Metering pump body; 6. Pump cover clamping assembly; 7. Coil prefabrication clamping assembly; 8. Riser pipe clamping assembly; 9. Immersion electric heater; 10. Liquid suction sealing ball; 11. Liquid suction pipe; 12. Residual liquid discharge slide bar; 13. Filter plate assembly; 14. Filter plate clamping assembly; 15. Gas connection; 16. Thermocouple; 17. Liquid inlet chamber; 18. Liquid inlet check valve; 19. Liquid inlet pipe body; 20. Sealed straight pipe body; 21. Riser pipe body; 22. Conical cavity; 23. Hook body; 24. Coil hanger; 25. Mounting plate; 26. Coil cover; 27. Heating and insulation sleeve; 28. Filter plate; 29. ​​Connecting bend; 30. Square box; 31. Liquid channel; 32. Pipe body connector; 33. Valve body. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Example 1

[0018] like Figure 2-6 As shown, this invention is applicable to the quantitative supply of molten aluminum in automated production lines. The invention provides a pneumatic quantitative aluminum pump with a self-sealing liquid outlet pipe 3 and a filtration function. It includes a quantitative pump body 5, with a pump cover 2 and a flow channel riser pipe 4 on the top. The pump cover 2 seals the quantitative pump body 5, making it a pressure vessel. The quantitative pump body 5 contains a suction pipe 11 and an outlet pipe 3. One end of the outlet pipe 3 is located at the bottom of the quantitative pump body 5, and the other end is connected to the bottom end of the flow channel riser pipe 4. Molten aluminum enters the quantitative pump body 5 through the suction pipe 11 and then flows from the outlet pipe 3 through the flow channel riser pipe 4 into the die-casting machine.

[0019] The top of the metering pump body 5 is equipped with an air connector 15 connected to the pneumatic system. The air connector 15 is used to connect the valve assembly of the pneumatic system, connecting the positive pressure air path and the negative pressure air path to provide positive or negative pressure to the metering pump body 5. The bottom of the metering pump body 5 is equipped with an inlet chamber 17. An inlet check valve 18 is installed between the top of the inlet chamber 17 and the inlet pipe. When the metering pump body 5 is under negative pressure, molten aluminum enters from the inlet chamber 17, passes through the inlet check valve, enters the inlet pipe, and then exits from the top of the inlet pipe. When the metering pump body 5 is under positive pressure, the inlet check valve seals the bottom of the inlet pipe. The outlet pipe 3 is configured as a serpentine coil. The outlet pipe 3 includes an inlet pipe body 19, a sealed straight pipe body 20, and a riser pipe body 21 that are interconnected. The bottom of the inlet pipe body 19 is located at the bottom of the metering pump body 5. The top of the riser pipe body 21 is connected to the riser pipe 4 of the flow channel. The sealed straight pipe body 20 is located in the middle of the outlet pipe 3. The top height of the sealed straight pipe body 20 is set to H2. The top height of the suction pipe 11 is set to... H1, the top height of the sealed straight tube 20 is higher than the top height of the suction tube 11, i.e., H2 > H1. When the metering pump body 5 is under negative pressure, due to the negative pressure, the molten aluminum in the sealed straight tube 20 flows out from bottom to top. The molten aluminum in the outlet tube 3 flows from one end of the inlet tube 19 located at the bottom of the metering pump body 5 to the riser tube 4 of the flow channel. The negative pressure in the pump continues to increase, but because H2 > H1, before the negative pressure lifts the molten aluminum to the sealed straight tube 20, the suction tube 11 has already started to... When the liquid is discharged, the negative pressure inside the metering pump body 5 is used to convert the liquid suction kinetic energy of the suction pipe 11, and will not be increased further. Therefore, the position of the sealing straight pipe body 20 of the liquid discharge pipe 3 remains stable and sealed. When the metering pump body 5 is under positive pressure, the bottom end of the suction pipe 11 is blocked by the liquid inlet check valve. Due to the positive pressure, the molten aluminum enters from the bottom end of the liquid discharge pipe 3 and flows to the flow channel riser pipe 4. The molten aluminum inside the metering pump body 5 is transported out of the pump and into the injection chamber of the die casting machine through the flow channel riser pipe 4.

[0020] In this invention, an external pneumatic system provides the negative pressure required for liquid suction, the positive pressure required for liquid discharge, and flow detection; the pneumatic system enables real-time adjustment of the internal pressure of the metering pump body 5 and real-time monitoring of the flow rate, thereby ensuring stable pressure and high aluminum discharge accuracy during the liquid discharge process.

[0021] The liquid inlet check valve 18 includes a conical cavity 22 and a liquid suction sealing ball 10. The top end of the conical cavity 22 is connected to the bottom end of the liquid inlet pipe. A port is provided between the bottom of the conical cavity 22 and the liquid inlet chamber 17. When the metering pump body 5 is under negative pressure, the liquid suction sealing ball 10 floats up and opens the port at the bottom of the conical cavity 22, allowing molten aluminum to enter the liquid suction pipe 11 from the liquid inlet chamber 17. When the metering pump body 5 is under positive pressure, the liquid suction sealing ball 10 falls down and seals the port at the bottom of the conical cavity 22.

[0022] A residual liquid discharge slide bar 12 is provided on one side of the liquid inlet check valve. A hook 23 with its end facing upward is provided at the bottom end of the residual liquid discharge slide bar 12. The end of the hook 23 is located at the bottom port of the conical cavity 22. When maintaining the metering pump, pulling the residual liquid discharge slide bar 12 upward will allow the end of the hook 23 to lift the liquid suction sealing ball 10 and release the residual aluminum liquid in the metering pump body 5.

[0023] A pump cover clamping assembly 6 is provided on the outside of the pump cover 2. The pump cover 2 is fixed on the large cover 1 of the heat preservation furnace by the pump cover clamping assembly 6. The large cover 1 of the heat preservation furnace is used to install and fix the quantitative pump body 5. The large cover 1 of the heat preservation furnace is installed at the aluminum outlet chamber of the heat preservation furnace. A mica sealing gasket is provided at the connection between the metering pump body 5 and the pump cover 2 to ensure sealing performance. A riser pipe clamping assembly 8 is provided on the pump cover 2 outside the riser pipe 4. The riser pipe 4 is fixed on the pump cover 2 by the riser pipe clamping assembly 8. A mica sealing gasket is provided at the connection between the riser pipe 4 and the outlet pipe 3 to ensure sealing performance.

[0024] The middle part of the outlet pipe 3 is fixed to the mounting plate 25 by the coil hanger 24. The mounting plate 25 is fixed to the top of the pump cover 2 by the coil cover 26. The pump cover 2 outside the coil cover 26 is provided with a coil prefabricated clamping assembly 7. The coil cover 26 is fixed to the pump cover 2 by the coil prefabricated clamping assembly 7, thereby fixing the mounting plate 25 and the outlet pipe 3 fixedly installed with the pump cover 2 inside the metering pump body 5.

[0025] An immersion electric heater 9 is installed inside the metering pump body 5 to maintain the temperature of the molten aluminum inside the pump; a thermocouple 16 is installed on the top of the metering pump body 5 to detect the temperature of the molten aluminum inside the pump; a heating and insulation sleeve 27 is installed on the outside of the riser pipe 4 to keep the molten aluminum inside the riser pipe 4 warm. Due to the protection of the immersion electric heater inside the metering pump body 5 and the heating and insulation sleeve 27 outside the riser pipe 4, the temperature of the molten aluminum entering the injection chamber of the die casting machine is guaranteed to be above 700℃.

[0026] A filter plate assembly 13 is provided on the outside of the liquid inlet chamber 17. The filter plate assembly 13 is fixed to the outside of the metering pump body 5 by the filter plate clamping assembly 14. A filter plate 28 is provided at the bottom of the filter plate assembly 13. The filter plate 28 is located on the outside of the liquid inlet chamber 17. The filter plate 28 filters the molten aluminum entering the liquid inlet chamber 17 and isolates the aluminum dross outside the metering pump body 5, thereby improving the quality of the molten aluminum. The quality K value of the molten aluminum is ≤0.1.

[0027] The outlet pipe 3 is designed as an integral structure. Since the sealing straight pipe body 20 in the middle of the outlet pipe 3 is a straight pipe, the connection between the inlet pipe body 19 and the sealing straight pipe body 20 in the integral structure outlet pipe 3 needs to be provided with a certain curvature to play a transitional connection role, so that the outlet pipe 3 as a whole forms a serpentine coil and all parts of the outlet pipe 3 are integrally formed. Example 2

[0028] Unlike Example 1, as Figure 7 The liquid outlet pipe 3 shown is configured as a split structure. The top end of the liquid inlet pipe body 19 of the split structure liquid outlet pipe 3 is connected to the top end of the sealed straight pipe body 20 through an upper connector, and the bottom end of the sealed straight pipe body 20 is connected to the bottom end of the riser pipe body 21 through a lower connector.

[0029] The upper and lower connectors are respectively set as connecting bends 29. The connecting bends 29 are 180° bends. When the connecting bends 29 are the upper connectors, both ends are connected to the ends of the inlet pipe body 19 and the sealed straight pipe body 20, respectively. When the connecting bends 29 are the lower connectors, both ends are connected to the ends of the sealed straight pipe body 20 and the riser pipe body 21, respectively. The connection method can be threaded connection or snap-fit ​​connection. The inlet pipe body 19, the upper connecting bends 29, the sealed straight pipe body 20, the upper connecting bends 29, and the riser pipe body 21 form an outlet pipe 3 with a serpentine passage inside. The upper and lower connectors are set as connecting bends 29 so that the inside of the outlet pipe 3 is smooth, which is convenient for cleaning the outlet pipe 3. Example 3

[0030] Unlike Example 2, as Figure 8 The connecting bend 29 shown is configured as a bend with both ends at 90°. Since the connecting bend 29 is made of high-temperature resistant silicon nitride, the manufacturing process of the 90° bend is easier than that of the 180° bend. Example 4

[0031] Unlike Example 2, as Figure 9 As shown, the upper and lower connectors are set as square boxes 30. A liquid channel 31 is provided inside the square box 30. Pipe connectors 32 are provided at both ends of the liquid channel 31. When the square box 30 is the upper connector, it is connected to the end of the liquid inlet pipe 19 and the end of the sealed straight pipe 20 through the pipe connectors 32. When the square box 30 is the lower connector, it is connected to the end of the sealed straight pipe 20 and the end of the riser pipe 21 through the pipe connectors 32. The liquid inlet pipe 19, the liquid channel 31 in the upper box, the sealed straight pipe 20, the liquid channel 31 in the lower box, and the riser pipe 21 form a serpentine passage of the liquid outlet pipe 3. The upper and lower connectors are set as square boxes 30 to facilitate the fixed connection with the mounting plate 25. The connection method can be threaded connection or snap-fit ​​connection.

[0032] This invention features a liquid outlet pipe 3 with a special serpentine coil shape. The height of the sealed straight pipe body 20 in the middle of the liquid outlet pipe 3 is reasonably set to form a sealed liquid level in the liquid outlet pipe 3. Through the height difference between the sealed liquid level and the outlet of the suction pipe 11, the negative pressure inside the metering pump body 5 is insufficient to raise the molten aluminum to the sealed liquid level. This achieves liquid self-sealing of the liquid outlet pipe 3 during the liquid inlet process of the metering pump body 5. The plug valve is eliminated at the liquid outlet pipe 3, and no control or detection is required. It is not easy to accumulate slag and cause blockage. While ensuring the quality of molten aluminum, it greatly improves the automation level of aluminum alloy die casting, minimizes manual labor, and reduces manufacturing costs.

Claims

1. A pneumatic metering aluminum dispensing pump with a self-sealing liquid outlet pipe, comprising a metering pump body, a pump cover and a flow channel riser pipe disposed on the top of the metering pump body, a suction pipe and an outlet pipe disposed within the metering pump body, one end of the outlet pipe being disposed at the bottom of the metering pump body, and the other end of the outlet pipe being connected to the bottom end of the flow channel riser pipe, characterized in that, The bottom of the metering pump body is provided with an inlet chamber, and an inlet check valve is provided between the top of the inlet chamber and the suction pipe. The top of the metering pump body is provided with an air connector, and the outlet pipe is provided with a serpentine coil. The outlet pipe includes an inlet pipe body, a sealed straight pipe body and a riser pipe body that are interconnected. The sealed straight pipe body is located in the middle of the outlet pipe, and the top height of the sealed straight pipe is higher than the top height of the suction pipe. Among them, a pump cover clamping assembly is provided on the outside of the pump cover, a riser pipe clamping assembly is provided on the pump cover on the outside of the flow channel riser pipe, the middle part of the outlet pipe is fixed to the mounting plate by the coil hanger, the mounting plate is fixed to the top of the pump cover by the coil cover, and a coil prefabricated clamping assembly is provided on the pump cover on the outside of the coil cover. The liquid inlet check valve includes a conical cavity and a liquid suction sealing ball, which is disposed in the conical cavity. A residual liquid discharge slide bar is provided on one side of the liquid inlet check valve, and a hook with an upward-facing end is provided at the bottom end of the residual liquid discharge slide bar. The end of the hook is located at the bottom port of the conical cavity.

2. The pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 1, characterized in that, The liquid outlet pipe can be designed as an integrated structure or a separate structure.

3. A pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 2, characterized in that, The split-type liquid outlet pipe has an inlet pipe and a riser pipe, which are both straight pipes. The top of the inlet pipe is connected to the top of the sealed straight pipe via an upper connector, and the bottom of the sealed straight pipe is connected to the bottom of the riser pipe via a lower connector.

4. A pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 3, characterized in that, The upper connector and the lower connector are respectively set as connecting bends. When the connecting bend is the upper connector, its two ends are connected to the ends of the liquid inlet pipe and the sealed straight pipe respectively. When the connecting bend is the lower connector, its two ends are connected to the ends of the sealed straight pipe and the riser pipe respectively.

5. A pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 4, characterized in that, The connecting bend can be set to a 90° bend or a 180° bend.

6. A pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 3, characterized in that, The upper and lower connectors are set as square boxes, and a liquid channel is provided inside the square box. The two ends of the liquid channel are provided with pipe joints. When the square box is the upper connector, it is connected to the end of the liquid inlet pipe and the end of the sealing straight pipe respectively through the pipe joints. When the square box is the lower connector, it is connected to the end of the sealing straight pipe and the end of the riser pipe respectively through the pipe joints.

7. A pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 1, characterized in that, A filter plate assembly is installed on the outside of the liquid inlet chamber, and the filter plate assembly is fixed to the outside of the metering pump body by a filter plate clamping assembly.

8. The pneumatic metering aluminum pump with a self-sealing liquid outlet pipe according to claim 1, characterized in that, The metering pump body is equipped with an immersion electric heater, a thermocouple is installed on the top of the metering pump body, and a heating and insulation jacket is installed on the outside of the flow channel riser pipe.

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