Gear backpressure device for continuous solid-liquid discharging

Abstract

The utility model discloses a gear backpressure device for continuous solid-liquid discharge, which relates to the technical field of chemical production process equipment, and comprises a gear backpressure device, the gear backpressure device comprises a shell, a driving gear, a driven gear and a motor; a mounting cavity is formed in the shell, the driving gear and the driven gear are arranged on the upper side and the lower side of the interior of the mounting cavity through shaft rods, and the driving gear and the driven gear are attached to the inner wall of the mounting cavity; the motor is arranged on the shell, and the output end of the motor is fixedly connected with one end of a shaft rod on the driving gear through a rotating shaft; a material inlet and a material outlet which communicate with the mounting cavity are symmetrically formed in the centers of the two sides of the shell correspondingly, and the material inlet and the material outlet are located between the driving gear and the driven gear; the pressure is easy to control, a pressure container does not need to be added, the investment is reduced, the problem of material blockage is solved, and continuous reaction of materials is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production process equipment, and particularly relates to a gear backpressure device for continuous solid-liquid discharging. Background Technique

[0002] In recent years, continuous reaction technology has been increasingly widely used in chemical production. The physical state of the materials processed in the continuous reaction process is becoming more and more complex, and it often has to face fluids in high-viscosity or solid-liquid states. In the continuous reaction process, the reaction rate is usually enhanced by temperature and pressure. In a continuous device in a closed system, the system pressure is increased by adding backpressure at the end of the reactor, so as to realize the intensification of the reaction. The reaction system works under a certain pressure under the action of a transfer pump or a device including a pressure gas source and a backpressure device. When the liquid material passes through the backpressure device and then enters the atmospheric pressure collector, so the backpressure system is a key device for isolating the atmospheric pressure section and the high-pressure section;

[0003] In the existing solutions, using a backpressure valve is a relatively common solution. If the reaction liquid is in a fully liquid state or a gas-liquid two-phase state, this backpressure valve solution is better. The principle of one type of backpressure valve is to control by the spring pressure to control the cross-sectional area of the valve cone and the material through-hole and the viscosity of the fluid. The principle of another type of backpressure valve is to control the pressure difference by using the gap between the pneumatic or hydraulic compressed diaphragm and the material through-hole and the viscosity of the material at the same time. Since the working principles of these two backpressure valves are both to achieve throttling by changing the through-diameter, the higher the backpressure achieved, the smaller the through-diameter to be controlled. When the material contains solids and the diameter is larger than the through-diameter, the solid material will be intercepted and a blockage will form in front of the backpressure valve. As time goes by, the blockage extends forward and finally completely blocks, and in serious cases, accidents will occur;

[0004] Another solution is to adopt the method of a backpressure tank. A pressure tank is installed at the end of the reactor. The pressure of the tank in the working state is the same as that of the reactor. The material directly enters the pressure tank from the reactor outlet. The gas phase part of the pressure tank is connected to a backpressure valve, and the reaction system pressure is controlled by controlling the gas pressure through the backpressure valve. Although this backpressure system solves the problem of material blockage, the reaction changes from the original continuity to intermittence, and a pressure vessel is added, which not only increases the investment but also brings trouble to the subsequent production management.

[0005] Therefore, there is an urgent need for a backpressure device that can realize continuous discharging of solid-containing materials. Content of the Utility Model

[0006] The purpose of the utility model is to provide a gear backpressure device for continuous solid-liquid discharging, which is easy to control the pressure, does not require adding a pressure vessel, reduces the investment, solves the problem of material blockage, and is easy for the material to continuously react.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A gear backpressure device for continuous solid-liquid discharging, comprising a gear backpressure device, the gear backpressure device including a housing, a driving gear, a driven gear, and a motor; an installation cavity is formed inside the housing, the driving gear and the driven gear are arranged on the upper and lower sides inside the installation cavity through a shaft rod, and both the driving gear and the driven gear are in contact with the inner wall of the installation cavity; the motor is arranged on the housing, and the output end of the motor is fixedly connected to one end of the shaft rod on the driving gear through a rotating shaft; material inlets and material outlets communicating with the installation cavity are symmetrically arranged at the centers of both sides of the housing respectively, and the material inlets and material outlets are located between the driving gear and the driven gear.

[0008] To improve the stability effect of the gear backpressure device, preferably, as a gear backpressure device for continuous solid-liquid discharging of the present utility model, a fixing seat is arranged at the bottom of the housing, and an installation through hole is formed on the fixing seat.

[0009] To facilitate the selection of the material of the housing, preferably, as a gear backpressure device for continuous solid-liquid discharging of the present utility model, the housing is made of stainless steel, Hastelloy or PEEK material.

[0010] To facilitate the selection of the materials of the driving gear and the driven gear, preferably, as a gear backpressure device for continuous solid-liquid discharging of the present utility model, the driving gear and the driven gear are made of PEEK, PTFE or PVDF material.

[0011] To facilitate the selection of the tooth profiles of the driving gear and the driven gear, preferably, as a gear backpressure device for continuous solid-liquid discharging of the present utility model, the tooth profiles of the driving gear and the driven gear are involute straight teeth or helical teeth.

[0012] To achieve the automatic control of the gear backpressure device, preferably, as a gear backpressure device for continuous solid-liquid discharging of the present utility model, it further includes a first metering pump, a second metering pump, a mixer, a tubular reactor, and a storage tank; the output ends of the first metering pump and the second metering pump are communicated with the inlet of the mixer through pipelines, the outlet of the mixer is communicated with the inlet of the tubular reactor, the outlet of the tubular reactor is communicated with the material inlet on the gear backpressure device through a pipeline, and the material outlet of the gear backpressure device is communicated with the inlet of the storage tank through a pipeline.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The present utility model is easy to control and adjust the pressure, can avoid material blockage, does not require the addition of a pressure vessel, reduces investment, and is conducive to the continuous reaction of materials. Description of the Drawings

[0015] Figure 1 Structural schematic diagram of the present utility model;

[0016] Figure 2 Rear view structural schematic diagram of the gear back pressure device of the present utility model;

[0017] Figure 3 Structural schematic diagram of the first metering pump and the second metering pump of the present utility model.

[0018] In the figure: 1. Gear back pressure device; 2. Housing; 3. Driving gear; 4. Driven gear; 5. Motor; 6. Installation cavity; 7. Material inlet; 8. Material outlet; 9. Fixed seat; 10. Installation through hole; 11. First metering pump; 12. Second metering pump; 13. Mixer; 14. Tubular reactor; 15. Storage tank. Specific embodiments

[0019] Please refer to Figure 1 and 2 , a gear back pressure device for continuous solid-liquid discharging, comprising a gear back pressure device 1, the gear back pressure device 1 includes a housing 2, a driving gear 3, a driven gear 4, and a motor 5; an installation cavity 6 is opened inside the housing 2, the driving gear 3 and the driven gear 4 are arranged on the upper and lower sides inside the installation cavity 6 through a shaft rod, and both the driving gear 3 and the driven gear 4 are in contact with the inner wall of the installation cavity 6; the motor 5 is arranged on the housing 2, and the output end of the motor 5 is fixedly connected to one end of the shaft rod on the driving gear 3 through a rotating shaft; material inlets 7 and material outlets 8 communicating with the installation cavity 6 are symmetrically arranged at the centers of both sides of the housing 2 respectively, and the material inlets 7 and the material outlets 8 are located between the driving gear 3 and the driven gear 4.

[0020] In this embodiment: during operation, the driving gear 3 rotates at a certain speed driven by a precisely controlled motor 5, driving the driven gear 4 to rotate. The teeth on the driving gear 3 and the driven gear 4 are divided into several narrow spaces with the housing 2. As the driving gear 3 and the driven gear 4 rotate, the solid-liquid mixed material is carried by the cavity and is discharged by extrusion at the low-pressure end under the rotation of the teeth. Since several sealing surfaces are formed between the teeth and between the teeth and the housing 2, the pressure at the high-pressure end can be effectively maintained. By adjusting the rotation speed of the motor 5, the discharge amount can be controlled, thereby realizing the control of the pressure at the high-pressure end (the rotation speed of the motor 5 is adjusted by a controller, which is not shown in the figure, and the controller can be adjusted by a single-chip microcomputer or a PLC controller);

[0021] This kind of gear back pressure device can also be used for continuous back pressure discharging of high-viscosity materials.

[0022] As a technical optimization scheme of the present utility model, a fixed seat 9 is arranged at the bottom of the housing 2, and an installation through hole 10 is opened on the fixed seat 9.

[0023] In this embodiment: The fixed seat 9 is arranged at the bottom of the housing 2. Through the mounting through holes 10 on the fixed seat 9, it is easy to fix the housing 2, improving the stability performance of the housing 2.

[0024] As a technical optimization scheme of the present utility model, the housing 2 is made of stainless steel, Hastelloy or PEEK.

[0025] In this embodiment: The housing 2 can be made of stainless steel, Hastelloy or PEEK. Stainless steel, Hastelloy or PEEK have good chemical stability, and excellent strength and stiffness, making the housing 2 not easily damaged.

[0026] As a technical optimization scheme of the present utility model, the driving gear 3 and the driven gear 4 are made of PEEK, PTFE or PVDF.

[0027] In this embodiment: PEEK, PTFE or PVDF have high chemical stability, good thermal stability, good antifriction property and excellent self-lubricity, making the driving gear 3 and the driven gear 4 not easily worn.

[0028] As a technical optimization scheme of the present utility model, the tooth profiles of the driving gear 3 and the driven gear 4 are involute spur teeth or helical teeth.

[0029] In this embodiment: The tooth profiles of the driving gear 3 and the driven gear 4 can be involute spur teeth or helical teeth.

[0030] As a technical optimization scheme of the present utility model, it further includes a first metering pump 11, a second metering pump 12, a mixer 13, a tubular reactor 14, a storage tank 15; the output ends of the first metering pump 11 and the second metering pump 12 are connected to the inlet of the mixer 13 through pipelines, the outlet of the mixer 13 is connected to the inlet of the tubular reactor 14, the outlet of the tubular reactor 14 is connected to the material inlet 7 on the gear back pressure regulator 1 through a pipeline, and the material outlet 8 of the gear back pressure regulator 1 is connected to the inlet of the storage tank 15 through a pipeline.

[0031] In this embodiment: Please refer to Figure 3 , the first metering pump 11 and the second metering pump 12 are metering pumps for two kinds of materials. The materials are transported into the mixer 13 through the first metering pump 11 and the second metering pump 12, and after being evenly mixed, they enter the tubular reactor 14. Solids are generated during the reaction process, and the solid-liquid mixture flows out from the pipeline outlet end and enters the gear back pressure regulator 1. The gear back pressure regulator 1 adjusts the rotation speed according to the reaction system pressure to maintain the pressure. The material outlet 8 of the gear back pressure regulator 1 is connected to the storage tank 15, making it easy for the storage tank 15 to receive the materials; through the measurement and feedback of the first metering pump 11 and the second metering pump 12, the rotation speed of the motor 5 on the gear back pressure regulator 1 can be set, thereby realizing the automatic control of back pressure regulation.

[0032] Working principle: During operation, the driving gear 3 rotates at a certain speed driven by the precision control motor 5, driving the driven gear 4 to rotate. The teeth on the driving gear 3 and the driven gear 4 divide the space between them and the housing 2 into several narrow spaces. As the driving gear 3 and the driven gear 4 rotate, the solid-liquid mixed material is carried by the cavities and discharged by extrusion at the low-pressure end under the rotation of the teeth. Since several sealing surfaces are formed between the teeth and between the teeth and the housing 2, the pressure at the high-pressure end can be effectively maintained. By adjusting the rotation speed of the motor 5, the discharge amount can be controlled, thereby realizing the pressure control at the high-pressure end;

[0033] By measuring and feedback the system pressure, and interlocking the rotation speed of the motor 5 of the gear back pressure regulator 1, the automatic control of the back pressure regulation can be realized. The specific implementation method is as follows:

[0034] The first metering pump 11 and the second metering pump 12 are metering pumps for two kinds of materials. The materials are transported by the pumps and enter the mixer 13. After being mixed evenly, they enter the tubular reactor 14. Solids are generated during the reaction process. The solid-liquid mixture flows out from the outlet end of the pipeline and enters the gear back pressure regulator 1. The gear back pressure regulator 1 adjusts the rotation speed according to the reaction system pressure to maintain the pressure. The outlet end of the gear back pressure regulator 1 is connected to the receiving storage tank 15.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gear backpressure device for continuous solid-liquid discharging, characterized in that: Comprising a gear back pressure regulator (1), the gear back pressure regulator (1) includes a housing (2), a driving gear (3), a driven gear (4), and a motor (5); an installation cavity (6) is formed inside the housing (2), the driving gear (3) and the driven gear (4) are arranged on the upper and lower sides inside the installation cavity (6) through a shaft rod, and both the driving gear (3) and the driven gear (4) are in contact with the inner wall of the installation cavity (6); the motor (5) is arranged on the housing (2), and the output end of the motor (5) is fixedly connected to one end of the shaft rod on the driving gear (3) through a rotating shaft; material inlets (7) and material outlets (8) communicating with the installation cavity (6) are symmetrically arranged at the centers of both sides of the housing (2), and the material inlets (7) and the material outlets (8) are located between the driving gear (3) and the driven gear (4).

2. The gear backpressure device for continuous solid-liquid discharging according to claim 1, wherein: A fixing seat (9) is arranged at the bottom of the housing (2), and an installation through hole (10) is formed on the fixing seat (9).

3. The gear backpressure device for continuous solid-liquid discharging according to claim 1, characterized in that: The housing (2) is made of stainless steel, Hastelloy or PEEK material.

4. A gear back pressure device for continuous solid-liquid discharging according to claim 1, characterized in that: The driving gear (3) and the driven gear (4) are made of PEEK, PTFE or PVDF material.

5. A gear backpressure device for continuous solid-liquid discharging according to claim 1, characterized in that: The tooth profiles of the driving gear (3) and the driven gear (4) are involute straight teeth or helical teeth.

6. A gear backpressure device for continuous solid-liquid discharging according to claim 1, characterized in that: It further includes a first metering pump (11), a second metering pump (12), a mixer (13), a tubular reactor (14), and a storage tank (15); the output ends of the first metering pump (11) and the second metering pump (12) are communicated with the inlet of the mixer (13) through pipelines, the outlet of the mixer (13) is communicated with the inlet of the tubular reactor (14), the outlet of the tubular reactor (14) is communicated with the material inlet (7) on the gear back pressure regulator (1) through a pipeline, and the material outlet (8) of the gear back pressure regulator (1) is communicated with the inlet of the storage tank (15) through a pipeline.

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