Raw material metering pump of ABS reaction device

Abstract

The invention discloses an ABS reaction device raw material metering pump which comprises a pump head, a first fluid chamber provided with a first diaphragm on one side is arranged in the pump head, the side, provided with the first diaphragm, of the first fluid chamber is adjacent to a first piston cylinder, and a first piston is driven by a driving assembly to reciprocate in the first piston cylinder. The first fluid chamber is communicated with a feeding check valve and a discharging check valve which are arranged on the pump head, a second diaphragm is arranged between the first diaphragm and the first piston, a second fluid chamber is formed between the first diaphragm and the second diaphragm, the side face of the second fluid chamber is connected with a flow channel in a heat exchanger through a pipeline, and the flow channel in the heat exchanger is connected with a second piston cylinder. A second piston is arranged in the second piston cylinder, and a second piston rod connected with the second piston and a first piston rod connected with the first piston are synchronously driven by a driving assembly. According to the raw material metering pump of the ABS reaction device, automatic cooling of hydraulic oil is achieved in the operation process, and a series of problems caused by too high temperature of the hydraulic oil are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of ABS production equipment, and specifically relates to a raw material metering pump for an ABS reaction device. Background Art

[0002] In the production process of ABS resin, a diaphragm metering pump is usually used in the raw material metering link of the reaction device to achieve precise feeding control of the reactants. Due to its medium isolation characteristics, this type of metering pump exhibits high safety performance advantages in scenarios of transporting corrosive and dangerous fluids. In the prior art, the diaphragm metering pump mainly drives a crank connecting rod mechanism or a cam mechanism through a motor, converts the rotational motion into the mechanical reciprocating motion of the piston, and uses hydraulic oil to transmit power to drive the deformation of the diaphragm, thereby completing the fluid transportation function. During the production of ABS, the transportation temperature of some raw materials is usually 60°C - 120°C, while the ideal working temperature of hydraulic oil is generally 40°C - 80°C. When the temperature exceeds 80°C, a series of problems will occur, such as the accelerated oxidation of hydraulic oil, an increase in viscosity, a deepening of the oil color, and an increase in acid value, which corrodes metal components. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a raw material metering pump for an ABS reaction device, which can automatically cool the hydraulic oil during operation and avoid a series of problems caused by excessive temperature of the hydraulic oil.

[0004] To solve the above technical problems, the present invention is solved by the following technical solutions: A raw material metering pump for an ABS reaction device, comprising a pump head. A first fluid chamber with a first diaphragm on one side is provided in the pump head. The side of the first fluid chamber having the first diaphragm is adjacent to a first piston cylinder. A first piston reciprocates in the first piston cylinder driven by a drive assembly. The first fluid chamber is connected to a feed check valve and a discharge check valve provided on the pump head. A second diaphragm is provided between the first diaphragm and the first piston. A second fluid chamber is formed between the first diaphragm and the second diaphragm. The side of the second fluid chamber is connected to a flow channel in a heat exchanger through a pipeline. The flow channel in the heat exchanger is connected to a second piston cylinder. A second piston is provided in the second piston cylinder. A second piston rod connected to the second piston and a first piston rod connected to the first piston are synchronously driven by the drive assembly. The second fluid chamber and the space between the first piston and the second diaphragm are both filled with hydraulic oil. This raw material metering pump for an ABS reaction device drives the first piston rod to reciprocate through the drive assembly, and at the same time drives the second piston rod to reciprocate. During the reciprocating movement of the first piston rod and the second piston rod, the first diaphragm and the second diaphragm are driven to deform to change the volume of the first fluid chamber, thereby realizing suction from the feed check valve side and discharging from the discharge check valve side. During the reciprocating movement of the second piston rod, the hydraulic oil in the second fluid chamber is continuously pumped out and squeezed in and dissipated heat through a radiator, achieving automatic cooling during the operation of the diaphragm pump, thereby effectively improving the heat dissipation efficiency of the hydraulic oil in the second fluid chamber close to the conveyed material. Moreover, the second fluid chamber plays a blocking role, slowing down the temperature rise of the hydraulic oil on the first piston side and avoiding a series of problems caused by too high an operating temperature of the hydraulic oil.

[0005] In the above technical solution, preferably, a driving rod parallel to and fixedly connected to the first piston rod penetrates through the pump housing. A first sliding seat is connected to the driving rod. A slideway is arranged on the first sliding seat. A second sliding seat is slidably arranged in the slideway. The second sliding seat is rotatably connected to the second piston rod. The second piston cylinder is fixedly arranged on the support seat at an adjustable angle through an angle adjustment mechanism. By adjusting the second piston cylinder, the stroke of the second piston rod can be adjusted when the stroke of the first piston rod remains unchanged. The flow channel in the heat exchanger is connected to the second piston cylinder through a hose. Existing metering diaphragm pumps generally rely on adjusting the stroke frequency to adjust the output flow and perform metering according to the number of strokes. However, due to factors such as wear during use, sealing problems, and the viscosity and temperature of the conveyed material in the metering diaphragm pump, the metering error will increase. Through the above technical solution, since the flow rate of a single stroke is the total flow rate brought about by the reciprocating action of the first piston and the second piston, and by adjusting the angle of the second piston cylinder, the stroke of the second piston in the second piston cylinder can be changed while the stroke of the first piston rod remains unchanged. Therefore, the total flow rate can be finely adjusted and calibrated to make the total flow rate more accurate and reduce the metering error caused by factors such as wear during use, sealing problems, and the viscosity and temperature of the conveyed material in the metering diaphragm pump.

[0006] In the above technical solution, preferably, the angle adjustment mechanism includes a hinge shaft that hinges the second piston cylinder to the support seat, a screw rod connected to the tail of the second piston cylinder, a nut threadedly engaged with the screw rod, and a positioning protrusion portion fixed to the side of the support seat and arranged around the hinge shaft. The nut squeezes the positioning protrusion portion to fix the second piston cylinder. With this structure, the second piston cylinder can be adjusted by loosening the nut, rotating the second piston cylinder to a predetermined angle, and then rotating the nut to squeeze the positioning protrusion portion. The second piston cylinder can be fixed at the preset angle and the adjustment is convenient.

[0007] In the above technical solution, preferably, a nut is threadedly engaged with the screw rod on both sides of the positioning protrusion portion. With this structure, the positioning of the second piston cylinder is more reliable.

[0008] In the above technical solution, preferably, the positioning protrusion portion is provided with a plurality of positioning planes. When the second piston cylinder rotates around the hinge shaft, there is a position where the screw rod is perpendicular to the positioning plane. With this structure, the positioning of the second piston cylinder is more reliable and slippage between the nut and the positioning protrusion portion is avoided.

[0009] In the above technical solution, preferably, the heat exchanger is an air-cooled heat exchanger or a water-cooled heat exchanger.

[0010] Compared with the prior art, the present invention has the following beneficial effects: In this ABS reaction device, the raw material metering pump drives the first piston rod to reciprocate through the driving assembly, and at the same time drives the second piston rod to reciprocate. During the reciprocating movement of the first piston rod and the second piston rod, the first diaphragm and the second diaphragm are driven to deform to change the volume of the first fluid chamber, so as to realize suction from the side of the feed check valve and discharge from the side of the discharge check valve; during the reciprocating movement of the second piston rod, the hydraulic oil in the second fluid chamber is continuously pumped out and squeezed in and cooled through the radiator, realizing automatic cooling during the operation of the diaphragm pump, thereby effectively improving the heat dissipation efficiency of the hydraulic oil in the second fluid chamber close to the conveyed material, and the second fluid chamber plays a blocking role, slowing down the temperature rise of the hydraulic oil on the first piston side and avoiding a series of problems caused by too high an operating temperature of the hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic cross-sectional structure diagram of Embodiment 1 of the present invention.

[0012] Figure 2 is Figure 1 a partial enlarged view of A in

[0013] Figure 3 is Figure 1 a partial enlarged view of B in

[0014] Figure 4 It is a schematic cross-sectional structure diagram of Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be further described in detail below in conjunction with the drawings and the specific embodiments: Refer to Figures 1 to 3, Example 1, A raw material metering pump for an ABS reaction device, comprising a pump head 1. Inside the pump head 1, there is a first fluid chamber 3 with a first diaphragm 2 on one side. The side of the first fluid chamber 3 adjacent to the first diaphragm 2 is adjacent to a first piston cylinder 4. A first piston 5 reciprocates in the first piston cylinder 4 driven by a drive assembly. The first fluid chamber 3 is connected to a feed check valve 6 and a discharge check valve 7 provided on the pump head 1. A second diaphragm 8 is provided between the first diaphragm 2 and the first piston 5. A second fluid chamber 9 is formed between the first diaphragm 2 and the second diaphragm 8. The side of the second fluid chamber 9 is connected to a flow channel in a heat exchanger 10 through a pipeline. The flow channel in the heat exchanger 10 is connected to a second piston cylinder 11. A second piston 12 is provided in the second piston cylinder 11. A second piston rod 13 connected to the second piston 12 and a first piston rod 14 connected to the first piston 5 are synchronously driven by the drive assembly. The second fluid chamber 9 and the space between the first piston 5 and the second diaphragm 8 are both filled with hydraulic oil. This raw material metering pump for the ABS reaction device drives the first piston rod 14 to reciprocate through the drive assembly, and at the same time drives the second piston rod 13 to reciprocate. During the reciprocating movement of the first piston rod 14 and the second piston rod 13, the first diaphragm 2 and the second diaphragm 8 are driven to deform to change the volume of the first fluid chamber 3, thereby realizing suction from the feed check valve 6 side and discharging from the discharge check valve 7 side; during the reciprocating movement of the second piston rod 13, the hydraulic oil in the second fluid chamber 9 is continuously pumped out and squeezed in and cooled by the radiator. During the operation of the diaphragm pump, automatic cooling is realized, thereby effectively improving the heat dissipation efficiency of the hydraulic oil in the second fluid chamber 9 close to the conveyed material. Moreover, the second fluid chamber 9 plays a blocking role, slowing down the temperature rise of the hydraulic oil on the first piston 5 side and avoiding a series of problems caused by too high an operating temperature of the hydraulic oil.

[0016] In this embodiment, a drive rod 16 parallel to and fixedly connected to the first piston rod 14 penetrates through the pump housing 15. A first sliding seat 17 is connected to the drive rod 16. The first sliding seat 17 slides on a slide rail outside the pump housing 15. A slideway 18 is provided on the first sliding seat 17. A second sliding seat 19 is slidably arranged in the slideway 18. The slideway 18 is a vertical through hole on a vertical frame. The two sides of the second sliding seat 19 are limited and can slide on the vertical through hole. The second sliding seat 19 is rotatably connected to the second piston rod 13. The second piston cylinder 11 is fixedly arranged on the support seat 20 with an adjustable angle through an angle adjustment mechanism. By adjusting the second piston cylinder 11, the stroke of the second piston rod 13 can be adjusted when the stroke of the first piston rod 14 remains unchanged. The flow channel in the heat exchanger 10 is connected to the second piston cylinder 11 through a hose. Existing metering diaphragm pumps generally rely on adjusting the stroke frequency to adjust the output flow and perform metering according to the number of strokes. However, due to factors such as wear during use, sealing problems, and the viscosity and temperature of the conveyed material of the metering diaphragm pump, the metering error will increase. Through the above technical solution, since the flow rate of a single stroke is the total flow rate brought by the reciprocating cooperation of the first piston 5 and the second piston 12, and by adjusting the angle of the second piston cylinder 11, the stroke of the second piston 12 in the second piston cylinder 11 can be changed when the stroke of the first piston rod 14 remains unchanged. Therefore, the total flow rate can be finely adjusted and calibrated to make the total flow rate more accurate and reduce the metering error caused by factors such as wear during use, sealing problems, and the viscosity and temperature of the conveyed material of the metering diaphragm pump.

[0017] In this embodiment, the angle adjustment mechanism includes a hinge shaft 21 that hinges the second piston cylinder 11 to the support seat 20, a screw rod 22 connected to the tail of the second piston cylinder 11, a nut 23 threadedly engaged with the screw rod 22, and a positioning protrusion 24 fixed on the side of the support seat 20 around the hinge shaft 21. The nut 23 squeezes the positioning protrusion 24 to fix the second piston cylinder 11. With this structure, the second piston cylinder 11 can be adjusted by loosening the nut 23, rotating the second piston cylinder 11 to a predetermined angle, and then rotating the nut 23 to squeeze the positioning protrusion 24. The second piston cylinder 11 can be fixed at a preset angle and the adjustment is convenient.

[0018] Of course, in other embodiments, the angle adjustment mechanism can also adopt other existing mechanical structures. For example, the second piston cylinder 11 is hinged to the support seat 20, a positioning plate is provided on the second piston cylinder 11, and it can also be positioned at different positions fixed on the support seat 20 by screws passing through the positioning plate. Those skilled in the art can easily understand that by other fixing structures, the second piston cylinder 11 can be fixed at multiple angles to achieve the technical purpose of the present invention.

[0019] In this embodiment, nuts 23 are in threaded engagement with the screw rods 22 on both sides of the positioning protrusion 24. This structure makes the positioning of the second piston cylinder 11 more reliable.

[0020] In this embodiment, a plurality of positioning planes 25 are provided on the positioning protrusion 24. When the second piston cylinder 11 rotates around the hinge shaft 21, there is a position where the screw rod 22 is perpendicular to the positioning plane 25, that is, the positioning protrusion 24 is part of a polygonal ring, and the center of the polygonal ring is the center of the hinge shaft 21. This structure makes the positioning of the second piston cylinder 11 more reliable and avoids slippage between the nut 23 and the positioning protrusion 24.

[0021] In this embodiment, the heat exchanger 10 is an air-cooled heat exchanger with a flow channel inside and a plurality of fins outside. Of course, in other embodiments, the heat exchanger can also be a water-cooled heat exchanger.

[0022] See Figure 4, Example 2, a raw material metering pump for an ABS reaction device, comprising a pump head 1. Inside the pump head 1, there is a first fluid chamber 3 with a first diaphragm 2 on one side. The first fluid chamber 3 has a side with the first diaphragm 2 adjacent to a first piston cylinder 4. A first piston 5 reciprocates in the first piston cylinder 4 driven by a drive assembly. The first fluid chamber 3 is connected to a feed check valve 6 and a discharge check valve 7 provided on the pump head 1. A second diaphragm 8 is provided between the first diaphragm 2 and the first piston 5. A second fluid chamber 9 is formed between the first diaphragm 2 and the second diaphragm 8. The side of the second fluid chamber 9 is connected to a flow channel in a heat exchanger 10 through a pipeline. The flow channel in the heat exchanger 10 is connected to a second piston cylinder 11. A second piston 12 is provided in the second piston cylinder 11. A second piston rod 13 connected to the second piston 12 and a first piston rod 14 connected to the first piston 5 are synchronously driven by the drive assembly. The second fluid chamber 9 and the space between the first piston 5 and the second diaphragm 8 are both filled with hydraulic oil. A drive rod 16 parallel to and fixedly connected to the first piston rod 14 penetrates through the pump housing 15. The second piston rod 13 is connected to the drive rod 16. The difference between Example 2 and Example 1 is that in Example 2, there is no angle adjustment mechanism and it does not have the function of fine-tuning and calibrating the total flow rate. The raw material metering pump for the ABS reaction device in this embodiment drives the first piston rod 14 to reciprocate through the drive assembly, and simultaneously drives the second piston rod 13 to reciprocate by the drive rod 16. During the reciprocating movement of the first piston rod 14 and the second piston rod 13, the first diaphragm 2 and the second diaphragm 8 are driven to deform to change the volume of the first fluid chamber 3, thereby realizing suction from the feed check valve 6 side and discharging from the discharge check valve 7 side; during the reciprocating movement of the second piston rod 13, the hydraulic oil in the second fluid chamber 9 is continuously pumped out and squeezed in and cooled by the radiator. During the operation of the diaphragm pump, automatic cooling is realized, thereby effectively improving the heat dissipation efficiency of the hydraulic oil in the second fluid chamber 9 close to the conveyed material. Moreover, the second fluid chamber 9 plays a blocking role, slowing down the temperature rise of the hydraulic oil on the first piston 5 side and avoiding a series of problems caused by too high an operating temperature of the hydraulic oil.

[0023] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A raw material metering pump for an ABS reaction device, comprising a pump head (1), wherein a first fluid chamber (3) having a first diaphragm (2) on one side thereof is provided in the pump head (1), wherein the first fluid chamber (3) has a first diaphragm (2) on one side thereof adjacent to a first piston cylinder (4), wherein a first piston (5) is driven to reciprocate in the first piston cylinder (4) by a driving assembly, wherein the first fluid chamber (3) is connected to a feed check valve (6) and a discharge check valve (7) provided on the pump head (1), and wherein the first fluid chamber (3) is characterized in that: A second diaphragm (8) is arranged between the first diaphragm (2) and the first piston (5), and a second fluid chamber (9) is formed between the first diaphragm (2) and the second diaphragm (8). The side of the second fluid chamber (9) is connected to a flow channel in a heat exchanger (10) through a pipeline. The flow channel in the heat exchanger (10) is connected to a second piston cylinder (11). A second piston (12) is arranged in the second piston cylinder (11). A second piston rod (13) connected to the second piston (12) and a first piston rod (14) connected to the first piston (5) are synchronously driven by the driving assembly. The second fluid chamber (9) and the space between the first piston (5) and the second diaphragm (8) are filled with hydraulic oil.

2. A raw material metering pump for an ABS reaction device as claimed in claim 1, characterized in that: A drive rod (16) is passed through the pump housing (15) and is parallel to the first piston rod (14) and fixedly connected to the first piston rod (14). The drive rod (16) is connected to a first sliding seat (17). A slideway (18) is provided on the first sliding seat (17). A second sliding seat (19) is slidably provided in the slideway (18). The second sliding seat (19) is rotatably connected to the second piston rod (13). The second piston cylinder (11) is fixed to the support seat (20) at an adjustable angle by an angle adjustment mechanism. The stroke of the second piston rod (13) is adjusted by adjusting the second piston cylinder (11) when the stroke of the first piston rod (14) remains unchanged. The flow channel in the heat exchanger (10) is connected to the second piston cylinder (11) by a hose.

3. A raw material metering pump for an ABS reaction device as claimed in claim 2, characterized in that: The angle adjustment mechanism comprises a hinge shaft (21) hingedly connecting the second piston cylinder (11) to the support seat (20), a screw rod (22) connected to the rear end of the second piston cylinder (11), a nut (23) threadedly engaged with the screw rod (22), and a positioning protrusion (24) fixed to the side of the support seat (20) and arranged around the hinge shaft (21), wherein the nut (23) squeezes the positioning protrusion (24) to fix the second piston cylinder (11).

4. A raw material metering pump for an ABS reaction device as claimed in claim 3, characterized in that: The screw rods (22) on both sides of the positioning protrusion (24) are threadedly engaged with a nut (23).

5. A raw material metering pump for an ABS reaction device as claimed in claim 3, characterized in that: A plurality of positioning planes (25) are provided on the positioning protrusion (24), and when the second piston cylinder (11) rotates around the hinge shaft (21), the screw rod (22) is in a position perpendicular to the positioning planes (25).

6. A raw material metering pump for an ABS reaction device as claimed in claim 1, characterized in that: The heat exchanger (10) is an air-cooled heat exchanger or a water-cooled heat exchanger.

Images