PVB pneumatic conveying system
By combining the design of variable frequency rotary valve, air supply throttling orifice plate and conveying throttling orifice plate with the blowing aid pipe and silo fluidizing valve, low-flow continuous conveying of PVB resin was achieved, solving the problem of resin breakage in pneumatic conveying systems, improving product quality and system stability, and reducing operating costs.
Patent Information
- Application Number
- CN202423075208.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing pneumatic conveying systems are prone to breakage when conveying PVB resin, affecting product quality. In addition, the mechanical equipment has a high failure rate, requires manual operation, and is costly.
The system employs a combination of a variable frequency rotary valve, an air supply throttling orifice plate, and a conveying throttling orifice plate to achieve continuous low-flow conveying. It also replenishes the resin through an auxiliary blowing pipe when the pressure drops, reducing the force of the resin during conveying. Combined with the fluidizing valve and balancing valve in the silo, it controls the pressure consistency and ensures that the resin does not break during conveying.
It greatly reduces the breakage rate of PVB, ensures product quality, operates stably and reliably, requires no manual supervision, has low cost, and is suitable for widespread application.
Smart Images
Figure CN223495635U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pneumatic conveying system, and more particularly to a PVB pneumatic conveying system. Background Technology
[0002] PVB (polyvinyl butyral) is a resin that has been used in many fields such as construction, automobiles, and aerospace due to its unique physical and chemical properties. It is normally granular and relatively stable, but it is prone to breakage under stress. Breakage will greatly affect its melting effect, thus directly affecting product quality.
[0003] Currently, PVB is transported using mechanical equipment such as tubular chains and bucket conveyors. During the transport process, these mechanical devices generate a lot of mechanical friction with PVB, resulting in a high breakage rate. In addition, these mechanical devices have drawbacks such as high failure rate, need for manual operation, and high labor costs.
[0004] Currently, pneumatic conveying systems, as an emerging technology, are considered ideal for transporting PVB. However, existing pneumatic conveying systems typically involve feeding material from a silo into a conveying pump, pressurizing the pump, and then rapidly conveying the material through a pipeline to a storage tank located at a distance. Therefore, as can be seen from this method, directly using existing pneumatic conveying systems to transport resins like PVB also presents the problem of PVB breakage, which needs to be addressed. Utility Model Content
[0005] The purpose of this invention is to provide a PVB pneumatic conveying system that reduces the breakage rate of PVB during the conveying process, thereby avoiding impact on product quality.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A PVB pneumatic conveying system includes a conveying pump, which comprises a pump body and an arc-shaped discharge elbow. A variable frequency rotary valve is installed between the pump body and the discharge elbow. A feed dome valve is installed at the inlet of the pump body, and a discharge dome valve is installed at the outlet of the discharge elbow. A discharge pipe is connected between the feed dome valve and a hopper located above the conveying pump, and an isolation valve is installed on the discharge pipe. The discharge dome valve is connected to a storage tank via a conveying pipe. The outlet of the conveying gas tank is connected to the inlet of a main pipeline. The outlet of the main pipeline is divided into two paths: one path connects to the hopper via a fluidized bed pipe, and a hopper fluidized bed valve is installed on the fluidized bed pipe; the other path connects to the inlet of a main air supply pipeline. The outlet of the main air supply pipeline is divided into five paths: the first path connects to the pump body via a pressurization pipe, and a pressurization valve is installed on the pressurization pipe; the second path connects to the pump body via the pump fluidization pipe... The pump body is connected, and a pump fluidization valve is installed on the pump fluidization pipeline. The third path is connected to the discharge elbow via a discharge air supply pipeline. An air supply valve is installed on the discharge air supply pipeline, and the outlet of the air supply valve is connected to an air supply throttling orifice plate. The fourth path is connected to the outlet of the discharge dome valve via a conveying air inlet pipeline. A conveying valve is installed on the conveying air inlet pipeline, and the outlet of the conveying valve is connected to a conveying throttling orifice plate. The number of openings on the air supply throttling orifice plate is less than or equal to the number of openings on the conveying throttling orifice plate, and the diameter of the openings on the air supply throttling orifice plate is much smaller than the diameter of the openings on the conveying throttling orifice plate. The fifth path is connected to an auxiliary blowing pipeline. The auxiliary blowing pipeline is arranged parallel to the conveying pipeline. Multiple auxiliary blowing branch pipelines are connected between the auxiliary blowing pipeline and the conveying pipeline. Each auxiliary blowing branch pipeline is arranged separately and parallel to the others, and an auxiliary blowing component is installed on each auxiliary blowing branch pipeline.
[0008] The advantages of this utility model are:
[0009] Compared with the existing pneumatic conveying system for transporting PVB, this invention greatly reduces the breakage rate of PVB during the transport process, avoids affecting its melting effect, ensures product quality, and is stable and reliable in operation, requires no manual supervision, has low cost, and is suitable for widespread application. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the composition of the PVB pneumatic conveying system of this utility model. Detailed Implementation
[0011] like Figure 1This utility model proposes a PVB pneumatic conveying system for conveying PVB (polyvinyl butyral, a resin). The system includes a conveying pump 10, which comprises a cylindrical pump body 101 and an arc-shaped discharge elbow 102. A variable frequency rotary valve 13 is installed between the pump body 101 and the discharge elbow 102. An inlet dome valve 11 is installed at the inlet of the pump body 101, and a discharge dome valve 12 is installed at the outlet of the discharge elbow 102. A discharge pipe connects the inlet dome valve 11 to a hopper 20 located above the conveying pump 10. 23. An isolation valve 22 is installed on the discharge pipe 23; the discharge dome valve 12 is connected to the inlet of the storage tank (not shown in the figure) via the conveying pipe 46; the outlet of the conveying gas tank (not shown in the figure) is connected to the inlet of the main pipe 41; the outlet of the main pipe 41 is divided into two paths, one path is connected to the silo 20 via the silo fluidization pipe 42, and a silo fluidization valve 420 is installed on the silo fluidization pipe 42; the other path is connected to the inlet of the main air supply pipe 47; the outlet of the main air supply pipe 47 is divided into five paths, the first path is connected to the pump body 101 via the pressurization pipe 43. First, a pressurizing valve 430 is installed on the pressurizing pipeline 43. Second, a pump fluidization pipeline 44 connects to the pump body 101, and a pump fluidization valve 440 is installed on the pump fluidization pipeline 44. Third, a discharge air supply pipeline 45 connects to the discharge elbow 102, and an air supply valve 450 is installed on the discharge air supply pipeline 45, with an air supply throttling orifice plate 451 connected to the outlet of the air supply valve 450. Fourth, a conveying air inlet pipeline 51 connects to the outlet of the discharge dome valve 12, and a conveying valve 510 is installed on the conveying air inlet pipeline 51, with the outlet of the conveying valve 510 connected to... There is a conveying throttling orifice plate 511, wherein the number of openings on the air supply throttling orifice plate 451 is less than or equal to the number of openings on the conveying throttling orifice plate 511, and the diameter of the openings on the air supply throttling orifice plate 451 is much smaller than the diameter of the openings on the conveying throttling orifice plate 511. The fifth path connects to the blowing aid pipe 52, which is arranged side by side with the conveying pipe 46. Multiple blowing aid branch pipes 53 are connected between the blowing aid pipe 52 and the conveying pipe 46. Each blowing aid branch pipe 53 is arranged in parallel with the others and a blowing aid component 530 is installed on each blowing aid branch pipe 53.
[0012] This invention, through the structural design of the variable frequency rotary valve 13, the air supply throttling orifice plate 451, the conveying throttling orifice plate 511, and the discharge dome valve 12, achieves the continuous low-flow (low-speed) delivery of resin from the pump 10 to the conveying pipeline 46, and then the resin already delivered to the conveying pipeline 46 is conveyed at a suitable flow rate. In actual implementation, the process of resin moving from the pump 10 to the conveying pipeline 46 is not continuous but is divided into two steps. This effectively reduces the stress on the resin during the process from the pump to the conveying pipeline 46, thereby reducing the resin breakage rate. The blowing aid pipe 52 effectively replenishes the pressure when the pressure in the conveying pipeline 46 decreases, ensuring a smooth, stable, and efficient conveying process.
[0013] In this invention, the gas delivery throttling orifice plate 451 and the conveying throttling orifice plate 511 are throttling orifice plates used to control the gas flow rate.
[0014] like Figure 1 An exhaust pipe 70 is connected between the pump body 101 and the hopper 20. A balance valve 701 is installed on the exhaust pipe 70. The balance valve 701 is used to exhaust air so that the pressure in the hopper 20 and the delivery pump 10 is consistent. Thus, the resin can fall from the hopper 20 into the delivery pump 10 under its own gravity. The pump body 101 is equipped with a high-level gauge 61 and a low-level gauge 62 at the top and bottom. The high-level gauge 61 and the low-level gauge 62 are used to detect the resin position in the pump. When the high-level gauge 61 sends a signal, it means that the resin in the pump is full. When the low-level gauge 62 sends a signal, it means that all the resin in the pump has been delivered. A pump pressure gauge 63 is installed on the pump body 101. The pump pressure gauge 63 is used to measure the internal pressure of the delivery pump 10. A pipeline pressure gauge 64 is installed on the delivery pipeline 46. The pipeline pressure gauge 64 is used to measure the pressure in the delivery pipeline 46.
[0015] like Figure 1 The outlet of the main pipeline 41 is also connected to the pneumatic control box 30 via the control air pipeline 49. The pneumatic control box 30 is connected to the feed dome valve 11, the discharge dome valve 12 and the isolation valve 22 via pipelines. That is, the feed dome valve 11, the discharge dome valve 12 and the isolation valve 22 are pneumatically controlled and controlled by the pneumatic control box 30.
[0016] like Figure 1 The outlet of the fluidizing valve 420 in the silo is connected to a pressure regulating valve 422. The fluidizing pipe 42 connected from the outlet of the pressure regulating valve 422 splits into multiple branches near the silo 20 and connects to the lower part of the silo 20. Each branch is evenly distributed along the circumference of the silo 20. A low-level gauge 201 is installed on the silo 20. The pressure regulating valve 422 is used to reduce the conveying air pressure output to the silo 20, so as to achieve uniform agitation of the granular resin (PVB) in the silo 20 and make it fall smoothly, while reducing the conveying force and avoiding resin breakage. The low-level gauge 201 is used to detect whether the resin in the silo 20 has dropped to the low limit position. When the low-level gauge 201 sends a signal indicating that all the resin in the silo 20 has been delivered, the isolation valve 22 should be closed.
[0017] In actual design, a manual slide gate valve 21 is usually installed on the material discharge pipe 23, between the outlet of the hopper 20 and the isolation valve 22. The manual slide gate valve 21 is used for maintenance and is normally open during non-maintenance periods.
[0018] like Figure 1The pump fluidization pipe 44, which is connected to the outlet of the pump fluidization valve 440, splits into multiple branches near the delivery pump 10 and then connects to the middle of the pump body 101. Each branch is evenly distributed along the circumference of the pump body 101.
[0019] In practical design, the blowing aid assembly 530 includes a throttling orifice plate and a check valve. The throttling orifice plate controls the gas flow rate, and the check valve prevents gas backflow. The throttling orifice plate should have multiple openings; the number and diameter of these openings can be designed according to actual requirements. The diameter of these openings is typically smaller than the opening diameter on the conveying throttling orifice plate 511. This throttling orifice plate is mainly used to control the amount of blowing aid gas supplied, ensuring stable resin delivery within the conveying pipe 46. In practice, the blowing aid pipe 52 can be connected at one end to the outlet of the main gas supply pipe 47 while the other end is closed. It is advisable that the blowing aid pipe 52 corresponds to the entire length of the conveying pipe 46.
[0020] like Figure 1 A filter 410 is installed on the main pipeline 41. The filter 410 is used to filter impurities and ensure the quality of the delivered gas.
[0021] In this utility model, the delivery pump 10 is a pressure vessel, and its volume can be designed as needed to meet the requirements of large-capacity delivery.
[0022] Typically, the inlet of the delivery gas tank is connected to the gas source, and an inlet valve is installed at the inlet. The delivery gas tank should also be equipped with a safety valve, pressure regulating valve, and drain valve; this is standard practice and will not be detailed here. Nitrogen is usually used as the delivery gas. The storage tank is used to store the PVB delivered from delivery pipeline 46.
[0023] In this invention, all valves, level gauges, pressure gauges, orifice plates, and dome valves are well-known technologies in the art. Except for the feed dome valve 11, discharge dome valve 12, and isolation valve 22, all valves, level gauges, and pressure gauges are connected to and controlled by the control device. Here, the control device is a well-known existing electronic control device, which will not be described in detail. The variable frequency rotary valve 13 is an existing valve; by adjusting the rotation of the variable frequency rotary valve 13, its discharge rate can be adjusted, thereby adjusting the discharge rate of the conveying pump 10.
[0024] During conveying, the isolation valve 22 and the feed dome valve 11 are opened, while the discharge dome valve 12 and the frequency conversion rotary valve 13 are closed. The balance valve 701 and the silo fluidization valve 420 are opened, and the resin (material) in the silo 20 falls into the conveying pump 10 under the push of fluidizing gas and gravity. When the high-level material level gauge 61 sends a signal indicating that the pump is full, the feed dome valve 11 and the isolation valve 22 are closed. The main air supply valve 470 and the pressurization valve 43 are opened, and the conveying gas tank outputs conveying gas (nitrogen). The conveying gas enters the conveying pump 10 through the pressurization pipeline 43, pressurizing the conveying pump 10. When the pump pressure gauge 63 and pipeline pressure gauge 64 detect that the pressure inside the pump is greater than or equal to the pressure inside the pipeline, the discharge dome valve 12, the frequency conversion rotary valve 13, the pump fluidization valve 440, and the air supply valve 450 are opened. The resin inside the pump begins to be conveyed under the action of fluidizing gas. After the discharge rate is adjusted by the frequency conversion rotary valve 13, it is delivered from the discharge elbow 102 into the conveying pipeline 46 under the action of a small flow rate of conveying gas output from the discharge air supply pipeline 45. Once all the resin in the pump has been delivered into the conveying pipeline 46, the discharge dome valve 12 is closed, and the conveying valve 510 is opened. Thus, the resin in the conveying pipeline 46 is delivered to the storage tank under the action of a smaller flow rate of conveying gas. Furthermore, during the conveying process, if the pressure inside the conveying pipeline 46 drops to a threshold value, the purging valve 520 can be opened to continuously purge and pressurize the conveying pipeline 46 to ensure continuous material conveying. As can be seen from the above, this utility model achieves continuous low-flow (low-speed) delivery of resin, thereby solving the problem of resin breakage during the delivery process.
[0025] The advantages of this utility model are:
[0026] Compared with the existing pneumatic conveying system for transporting PVB, this invention greatly reduces the breakage rate of PVB during the transport process, avoids affecting its melting effect, ensures product quality, and is stable and reliable in operation, requires no manual supervision, has low cost, and is suitable for widespread application.
[0027] The above describes the preferred embodiment of this utility model and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solution of this utility model without departing from the spirit and scope of this utility model shall fall within the protection scope of this utility model.
Claims
1. A PVB pneumatic conveying system, characterized in that, The system includes a conveying pump, comprising a pump body and an arc-shaped discharge elbow. A variable frequency rotary valve is installed between the pump body and the discharge elbow. A feed dome valve is installed at the inlet of the pump body, and a discharge dome valve is installed at the outlet of the discharge elbow. A discharge pipe connects the feed dome valve to a hopper located above the conveying pump, and an isolation valve is installed on the discharge pipe. The discharge dome valve is connected to a storage tank via a conveying pipe. The outlet of the conveying gas tank is connected to the inlet of the main pipeline. The outlet of the main pipeline is divided into two paths: one path connects to the hopper via a fluidized bed pipe, on which a hopper fluidized bed valve is installed; the other path connects to the inlet of the main gas supply pipeline. The outlet of the main gas supply pipeline is divided into five paths: the first path connects to the pump body via a pressurization pipe, on which a pressurization valve is installed; the second path connects to the pump body via a pump fluidization pipe; and so on. A pump fluidization valve is installed on the pump fluidization pipeline. A third path is connected to the discharge elbow via a discharge air supply pipeline. An air supply valve is installed on the discharge air supply pipeline, and the outlet of the air supply valve is connected to an air supply throttling orifice plate. A fourth path is connected to the outlet of the discharge dome valve via a conveying air inlet pipeline. A conveying valve is installed on the conveying air inlet pipeline, and the outlet of the conveying valve is connected to a conveying throttling orifice plate. The number of openings on the air supply throttling orifice plate is less than or equal to the number of openings on the conveying throttling orifice plate, and the diameter of the openings on the air supply throttling orifice plate is much smaller than the diameter of the openings on the conveying throttling orifice plate. A fifth path is connected to an auxiliary blowing pipeline. The auxiliary blowing pipeline is arranged parallel to the conveying pipeline. Multiple auxiliary blowing branch pipelines are connected between the auxiliary blowing pipeline and the conveying pipeline. Each auxiliary blowing branch pipeline is arranged separately and parallel to the others, and an auxiliary blowing component is installed on each auxiliary blowing branch pipeline.
2. The PVB pneumatic conveying system as described in claim 1, characterized in that, An exhaust pipe is connected between the pump body and the hopper. A balance valve is installed on the exhaust pipe. A high-level gauge and a low-level gauge are installed on the top and bottom of the pump body. A pump pressure gauge is installed on the pump body. A pipeline pressure gauge is installed on the conveying pipeline.
3. The PVB pneumatic conveying system as described in claim 1, characterized in that, The outlet of the main pipeline is also connected to the pneumatic control box via a control air pipeline, and the pneumatic control box is connected to the feed dome valve, the discharge dome valve and the isolation valve via a pipeline.
4. The PVB pneumatic conveying system as described in claim 1, characterized in that, The outlet of the fluidizing valve of the silo is connected to a pressure regulating valve. The fluidizing pipe of the silo connected from the outlet of the pressure regulating valve splits into multiple branches near the silo and then connects to the lower part of the silo. Each branch is evenly distributed along the circumference of the silo. A low level gauge of the silo is installed on the silo.
5. The PVB pneumatic conveying system as described in claim 1, characterized in that, The pump fluidization pipe, which is connected from the outlet of the pump fluidization valve, splits into multiple branches near the delivery pump and then connects to the middle of the pump body. Each of the branches is evenly distributed along the circumference of the pump body.
6. The PVB pneumatic conveying system as described in claim 1, characterized in that, The blowing aid assembly includes a throttling orifice plate and a check valve.
7. The PVB pneumatic conveying system as described in claim 1, characterized in that, A filter is installed on the main pipeline.