Automatic backwashing filter outlet pressure control system

Abstract

The utility model discloses an outlet pressure control system for automatic backwashing filters, which belongs to the technical field of viscose production and comprises a gear pump and a plurality of automatic backwashing filters connected with the gear pump and controlled by the gear pump. The pressure balancing barrel is connected with a pressure regulating and controlling device for stabilizing the pressure in the balancing barrel, and the pressure regulating and controlling device is used for regulating the air pressure in the pressure balancing barrel, so that the outlet pressure of the automatic backwashing filter is stable. According to the utility model, the outlet pressure end of each backwashing filter is connected into the pressure balance barrel, and the outlet pressure of each filter is stable by controlling the pressure in the pressure balance barrel to be stable, so that the back pressure of outlet viscose during backwashing is reduced to the greatest extent, the generation of waste viscose is reduced, and the stability of product quality is further improved.

Description

Technical Field

[0001] This utility model relates to the field of viscose fiber production, specifically to an automatic backwash filter outlet pressure control system. Background Technology

[0002] With the increasing competition in the viscose staple fiber industry, improving the production quality of viscose staple fiber is a crucial issue facing viscose companies. In the viscose fiber preparation process, viscose filtration is the most critical step. The quality of viscose depends heavily on the effectiveness of filtration control. Stable filtration control stabilizes the particle count in subsequent viscose processes, significantly improving the quality of both the viscose and the spinning process.

[0003] Currently, viscose manufacturing companies commonly use a one-to-three or one-to-four control method for viscose filtration. This involves one gear pump driving three or four automatic backwash filters. A regulating valve is typically installed at the outlet of each automatic backwash filter to control the outlet pressure. Pressure transmitters are installed at the inlet and outlet of the filters, and the backwashing is controlled by the pressure difference between the inlet and outlet. During backwashing, the pressure difference of a group of automatic backwash filters is the same. Generally, when the set backwash pressure difference is reached, the three or four filters begin backwashing sequentially. However, this control method has the following problems:

[0004] First, the filter outlet pressure is controlled by an automatic regulating valve, which causes fluctuations in filtration volume in order to stabilize the pressure. Furthermore, during backwashing, the return of adhesive will also cause fluctuations in the filter outlet pressure, resulting in fluctuations in the backwash pressure differential. This not only affects the filtration volume but also causes some damage to the filter screen, ultimately leading to fluctuations in adhesive quality. Second, using a one-to-three or one-to-four control method is a waste of capacity for the adhesive pump. The filtration volume of an automatic backwash filter is generally 2-3 m³ / h, but the adhesive supply pump is usually equipped with a 30 m³ / h gear pump, which is an example of "using a large horse to pull a small cart" and a waste of the pump's capacity. Utility Model Content

[0005] This invention aims to solve the problems caused by pressure fluctuations in the outlet pressure regulation of automatic backwash filters in the prior art, which leads to a series of issues. It proposes an outlet pressure control system for automatic backwash filters. This control system can stabilize the outlet pressure of the automatic backwash filter, minimize the back pressure of adhesive residue at the outlet during backwashing, and minimize the generation of waste adhesive.

[0006] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0007] An automatic backwash filter outlet pressure control system includes a gear pump and multiple automatic backwash filters connected to and controlled by the gear pump. The outlets of each automatic backwash filter are connected to a pressure balancing tank via liquid inlet pipelines. The pressure balancing tank is connected to a pressure regulating device for stabilizing the pressure inside the tank. The pressure regulating device adjusts the air pressure inside the pressure balancing tank to stabilize the outlet pressure of the automatic backwash filter.

[0008] Furthermore, the pressure regulating device includes a pressure monitoring instrument installed on the pressure balance tank for monitoring the internal pressure, a compressed air input pipe and an output pipe connected to the inside of the pressure balance tank, and automatic regulating valves respectively installed on the input and output pipes and interlocked with the pressure monitoring instrument.

[0009] Furthermore, the pressure monitoring instrument is also interlocked with the gear pump, controlling the pump to shut down when the pressure exceeds the limit.

[0010] Furthermore, the pressure monitoring instrument includes two air pressure monitors respectively installed on the upper and lower sides of the pressure balance tank body, and the pressure monitoring instrument uses the average value of the monitoring values ​​of the two air pressure monitors as the detection pressure value.

[0011] Furthermore, the pressure balancing tank is also equipped with a liquid level control device, which includes a liquid level monitoring instrument installed on the pressure balancing tank, a liquid discharge pipeline connected to the pressure balancing tank, and a liquid discharge control valve installed on the liquid discharge pipeline and interlocked with the liquid level monitoring instrument to prevent the liquid level in the balancing tank from being too high.

[0012] Furthermore, the liquid level sensor is a differential pressure liquid level sensor.

[0013] Furthermore, the aforementioned automatic backwash filters are grouped according to their quantity, with each group consisting of 4 to 18 automatic backwash filters. Each group of automatic backwash filters is connected to a pressure balance tank via a liquid inlet delivery pipeline.

[0014] Furthermore, a flow meter is installed on the liquid inlet pipeline of each automatic backwash filter connected to the pressure balance tank to monitor the amount of adhesive passed through each automatic backwash filter.

[0015] In summary, this utility model has the following advantages:

[0016] 1. In this utility model, the outlet pressure end of each backwash filter is connected to a pressure balance tank. By controlling the pressure in the pressure balance tank to stabilize, the outlet pressure of each filter can be stabilized, thereby minimizing the back pressure of the adhesive at the outlet during backwashing and reducing the generation of waste adhesive.

[0017] 2. In this utility model, the pressure balance tank is connected to a pressure regulating device. The pressure regulating device can automatically adjust the opening of the compressed air input / output pipeline according to the monitoring value of the pressure monitoring instrument, thereby stabilizing the pressure inside the pressure balance tank.

[0018] 3. In this utility model, two air pressure monitoring instruments are respectively installed near the upper and lower sides of the pressure balance tank. The average value of the monitoring values ​​of the two instruments is used as the detection pressure value to improve the accuracy of pressure monitoring.

[0019] 4. In this utility model, the pressure monitoring instrument on the pressure balance tank is also interlocked with the gear pump to control the start and stop of the pump, so as to prevent the filter and pump from being damaged due to excessive outlet pressure.

[0020] 5. In this utility model, the pressure balancing tank is also connected to a liquid level control device. The liquid level control device can drain excess liquid in the balancing tank to prevent the liquid level in the pressure balancing tank from being too high and affecting the pressure control in the balancing tank.

[0021] 6. In this utility model, the "one-to-many" method is adopted, which can enable one glue supply pump to drive the maximum number of automatic washing and filtering machines, thereby reducing equipment investment and avoiding the situation of "oversized motor driving a small cart".

[0022] 7. In this utility model, by grouping the filters and installing a flow meter on the pipe connecting the outlet of each group of automatic backwash filters to the pressure balance tank, the amount of glue passing through each group of automatic backwash filters can be seen intuitively, so as to quickly determine which group of filters has a problem and facilitate subsequent maintenance. Attached Figure Description

[0023] Figure 1 This is a system schematic diagram of the present invention;

[0024] In the picture:

[0025] 1. Automatic backwash filter; 2. Pressure balance tank; 3. Flow meter; 4. Liquid inlet delivery pipe; 5. Compressed air input pipe; 6. Compressed air output pipe; 7. Automatic regulating valve; 8. Pressure monitoring instrument; 9. Liquid outlet delivery pipe; 10. Liquid outlet control valve; 11. Liquid level sensor. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1

[0031] As a basic implementation of this utility model, this embodiment provides an automatic backwash filter outlet pressure control system, including a gear pump and multiple automatic backwash filters 1 connected to and controlled by the gear pump. The outlets of each automatic backwash filter 1 are connected to a pressure balancing tank 2 through a liquid inlet conveying pipe 4. The pressure balancing tank 2 is connected to a pressure regulating device for stabilizing the pressure inside the tank. The pressure regulating device adjusts the air pressure inside the pressure balancing tank 2 to stabilize the outlet pressure of the automatic backwash filter.

[0032] In this scheme, since the outlet pressure end of each automatic backwash filter 1 is connected to the pressure balance tank 2, the pressure in the pressure balance tank 2 is stabilized, which can stabilize the outlet pressure of each automatic backwash filter 1, thereby minimizing the back pressure of the adhesive at the outlet during backwashing and reducing the generation of waste adhesive.

[0033] Specifically, in this embodiment, the pressure regulating device includes a pressure monitoring instrument 8 installed on the pressure balancing tank 2 for monitoring the internal pressure, a compressed air input pipe 5 and an output pipe connected to the inside of the pressure balancing tank 2, and an automatic regulating valve 7 installed on the input and output pipes and interlocked with the pressure monitoring instrument 8. The automatic regulating valve 7 automatically adjusts the valve opening according to the monitoring value of the pressure monitoring instrument 8, thereby stabilizing the pressure inside the pressure balancing tank 2.

[0034] Furthermore, the pressure monitoring instrument 8 is also interlocked with the gear pump to control the start and stop of the pump, in order to prevent excessive outlet pressure from damaging the automatic backwash filter and the pump.

[0035] To improve the accuracy of pressure monitoring, this embodiment uses two air pressure monitors, which are respectively positioned near the upper and lower sides of the balance tank. The average value of the two instrument readings is used as the detection pressure value to regulate the air pressure inside the balance tank.

[0036] In this invention, the pressure balancing method inside the pressure balancing tank 2 is as follows:

[0037] The pressure balancing tank 2 is set to a constant pressure value, for example, 0.5 MPa. When the pressure monitoring instrument 8 detects that the pressure inside the pressure balancing tank 2 is higher than the set value, the opening of the automatic regulating valve 7 on the compressed air output pipeline 6 increases; when the pressure monitoring instrument 8 detects that the pressure inside the pressure balancing tank 2 is lower than the set value, the opening of the automatic regulating valve 7 on the compressed air input pipeline 5 increases. The pressure inside the pressure balancing tank 2 is dynamically adjusted to stabilize it in the above manner. When the pressure inside the pressure balancing tank 2 is too high, the pump is shut down to protect the KKF filter screen and pump.

[0038] Example 2

[0039] As a preferred embodiment of this utility model, this embodiment provides an automatic backwash filter outlet pressure control system, including a gear pump and multiple automatic backwash filters 1 connected to and controlled by the gear pump. The outlets of each automatic backwash filter 1 are connected to a pressure balancing tank 2 through a liquid inlet conveying pipe 4. The pressure balancing tank 2 is connected to a pressure regulating device for stabilizing the pressure inside the tank. The pressure regulating device adjusts the air pressure inside the pressure balancing tank 2 to stabilize the outlet pressure of the automatic backwash filter.

[0040] This embodiment differs from Embodiment 1 in the following ways:

[0041] In this embodiment, the pressure balancing tank 2 is also equipped with a liquid level control device. The liquid level control device includes a liquid level monitoring instrument installed on the pressure balancing tank 2, a liquid discharge pipeline 9 connected to the pressure balancing tank 2, and a liquid discharge control valve 10 installed on the liquid discharge pipeline 9 and interlocked with the liquid level monitoring instrument to prevent the liquid level in the balancing tank from being too high.

[0042] Preferably, in this embodiment, the liquid level monitoring instrument is a differential pressure liquid level sensor 11, which is signal-connected to the liquid outlet control valve 10 to control the valve opening.

[0043] By setting up a liquid level control device, the liquid in the balance tank can be discharged to the next process to prevent the liquid level in the pressure balance tank 2 from being too high and affecting the pressure control in the balance tank.

[0044] Example 3

[0045] As the preferred embodiment of this utility model, this embodiment provides an automatic backwash filter outlet pressure control system, including a gear pump and an automatic backwash filter 1 connected to and controlled by the gear pump. The outlets of each automatic backwash filter are connected to a pressure balance tank 2 through a liquid inlet conveying pipe 4. The pressure balance tank 2 is provided with a compressed air inlet and an exhaust outlet. By adjusting the air pressure in the pressure balance tank 2 through the inlet and exhaust outlet, the outlet pressure of the automatic backwash filter can be stabilized.

[0046] In this embodiment, Figure 1 Taking the automatic backwash filter outlet pressure control system shown as an example, it adopts a one-to-fifteen control method, that is, one 60m filter... 3 A gear pump with a capacity of / h corresponds to fifteen automatic backwash filters. These fifteen automatic backwash filters are physically divided into two groups (one group with seven filters and the other with eight filters). The outlet of each group of automatic backwash filters is connected to the pressure balance tank 2 through the liquid inlet pipeline 4. A flow meter 3 is installed for each group of automatic backwash filters for flow monitoring. The flow meter 3 can be used to visually observe the filtration status and glue throughput of each group of automatic backwash filters, so as to quickly determine which group of automatic backwash filters has a problem and facilitate subsequent maintenance.

[0047] It should be noted that, provided the pump capacity allows, the number of automatic backwash filters can actually be increased to a maximum of 18 units per group. The specific number can be adjusted according to the actual situation and is not considered a limitation of this utility model.

[0048] In this scheme, the pressure regulation device includes a pressure monitoring instrument 8 installed on the pressure balance tank 2 for monitoring the internal pressure, a compressed air input pipe 5 and an output pipe connected to the inside of the pressure balance tank 2, and automatic regulating valves 7 respectively installed on the input and output pipes and interlocked with the pressure monitoring instrument 8. The automatic regulating valves 7 automatically adjust their opening degree according to the monitoring value of the pressure monitoring instrument 8, thereby stabilizing the pressure inside the pressure balance tank 2.

[0049] Since the outlet pressure of these 15 automatic backwash filters is equal to the pressure inside pressure balance tank 2, the outlet pressure of the automatic backwash filters can be kept constant. Stable outlet pressure minimizes the back pressure of the adhesive residue during backwashing, thereby reducing the generation of waste adhesive. Simultaneously, the presence of pressure balance tank 2 maximizes the filtration efficiency of the automatic backwash filters, ensuring their stability and reducing filter screen wear.

[0050] The control method for the automatic reverse filter washing machine system in this embodiment is as follows:

[0051] In terms of logical grouping, the fifteen automatic backwash filters are divided into three groups, with five automatic backwash filters in each group. Backwashing is performed sequentially using pressure difference. Due to the setting of pressure balance tank 2, the outlet pressure of the automatic backwash filter is constant. Therefore, after calculating the pressure difference based on the inlet pressure of the automatic backwash filter, backwashing can be started synchronously according to the logical grouping. Each group is backwashed sequentially according to the pressure difference, and five backwashes constitute one cycle.

[0052] The layout and control method of this utility model can greatly reduce energy consumption and installation investment, reduce equipment investment, and avoid the situation of "using an oversized engine for a small load". By installing a flow meter 3 at the outlet of each automatic backwash filter, the filtration status and glue throughput of each automatic backwash filter can be directly observed. By setting up a pressure balancing tank 2 to keep the outlet pressure of the 15 automatic backwash filters constant, the outlet pressure of the automatic backwash filters can be stabilized, the filtration efficiency of the automatic backwash filter 1 can be maximized, the wear of the filter screen can be reduced, the back pressure of glue sticking at the outlet during backwashing can be reduced, thereby reducing the generation of waste glue and improving the stability of product quality.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An automatic backwash filter outlet pressure control system, comprising a gear pump and multiple automatic backwash filters (1) connected to and controlled by the gear pump, characterized in that, The outlets of each automatic backwash filter (1) are connected to a pressure balance tank (2) through a liquid inlet conveying pipe (4). The pressure balance tank (2) is connected to a pressure regulating device for stabilizing the pressure inside the balance tank. The pressure regulating device is used to adjust the air pressure inside the pressure balance tank (2) so that the outlet pressure of the automatic backwash filter (1) is stabilized.

2. The automatic backwash filter outlet pressure control system as described in claim 1, characterized in that, The pressure regulating device includes a pressure monitoring instrument (8) installed on the pressure balance tank (2) for monitoring the internal pressure, a compressed air input pipe (5) and an output pipe connected to the inside of the pressure balance tank (2), and automatic regulating valves (7) respectively installed on the input and output pipes and interlocked with the pressure monitoring instrument (8).

3. The automatic backwash filter outlet pressure control system as described in claim 2, characterized in that, The pressure monitoring instrument (8) includes two air pressure monitors respectively installed on the upper and lower sides of the pressure balance tank. The pressure monitoring instrument (8) uses the average value of the two air pressure monitors as the detection pressure value.

4. An automatic backwash filter outlet pressure control system as described in claim 2 or 3, characterized in that, The pressure monitoring instrument (8) is also interlocked with the gear pump, which controls the pump to shut down when the pressure exceeds the limit.

5. The automatic backwash filter outlet pressure control system as described in claim 1, characterized in that, The pressure balancing tank (2) is also equipped with a liquid level control device, which includes a liquid level monitoring instrument installed on the pressure balancing tank (2), a liquid discharge pipeline (9) connected to the pressure balancing tank (2), and a liquid discharge control valve (10) installed on the liquid discharge pipeline (9) and interlocked with the liquid level monitoring instrument to prevent the liquid level in the balancing tank from being too high.

6. The automatic backwash filter outlet pressure control system as described in claim 5, characterized in that, The liquid level monitoring instrument is a differential pressure liquid level sensor (11).

7. The automatic backwash filter outlet pressure control system as described in claim 1, characterized in that, The automatic backwashing filter (1) is grouped according to the quantity, with each group corresponding to 4 to 18 automatic backwashing filter (1). Each group of automatic backwashing filter (1) is connected to the pressure balance tank (2) through the liquid inlet conveying pipe (4).

8. The automatic backwash filter outlet pressure control system as described in claim 7, characterized in that, Each automatic backwash filter (1) is connected to a pressure balance tank (2) via a liquid inlet delivery pipe (4) equipped with a flow meter (3) to monitor the amount of glue passing through each automatic backwash filter (1).

Images