Water-cooling sealing gear pump for extrusion granulation system
By designing the spiral groove and cooling runner structure of the water-cooled sealed gear pump, combined with the molten material lubrication and cooling water system, the material leakage, temperature control and lubrication problems in the extrusion granulation system are solved, and the stable operation and protection of the equipment are achieved.
Patent Information
- Application Number
- CN202422590731.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The prior art lacks gear pumps specially used in extrusion granulation systems, which are difficult to meet the needs of material leakage prevention, temperature control and bearing lubrication, and are easy to start the gear shaft in a dry friction state.
A water-cooled sealed gear pump is designed, which uses a sealing sleeve of spiral grooves and cooling flow channels to limit the flow of materials, and is cooled by cooling water. The bearing is lubricated with molten materials, and a discharge valve and return flow channel are set to determine the lubrication state to prevent dry friction from starting.
Effectively prevent material leakage, control material temperature, ensure bearing lubrication, avoid dry friction start, and improve production stability and equipment life.
Smart Images
Figure CN223136381U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of extrusion granulation systems, in particular to a water-cooled sealed gear pump for an extrusion granulation system. Background Art
[0002] A kneading extrusion granulation unit can knead, plasticize, extrude, pelletize, separate and dry materials, and finally process them into regular granular products. The extrusion granulation system is an important part of the kneading extrusion granulation unit, mainly including a melt gear pump, a screen changer, a die head template and a pelletizer. The molten material is transported by the melt gear pump, first passes through the screen changer for filtration, then passes through the die head template and enters the pelletizer in many strip shapes, and is cut into granules by the cutter head of the pelletizer and carried away by water flow. The gear pump provides pressure for the material, further improves the plasticization degree of the material, enables the downstream equipment to obtain materials with uniform temperature and stable working pressure, can improve the production capacity of the unit, expand the production range of the unit, reduce the load of the main drive, and reduce the unit consumption of production. However, there is currently a lack of a gear pump specifically applied to the extrusion granulation system, making it difficult to meet various special usage requirements of the extrusion granulation system. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a water-cooled sealed gear pump for an extrusion granulation system, which can prevent material leakage, facilitate the control of material temperature and the lubrication of bearings, and can prevent the gear shaft from starting under dry friction conditions to protect the gear shaft.
[0004] The technical solution adopted by the utility model to solve the above technical problems is: a water-cooled sealed gear pump for an extrusion granulation system, including a pump body, side plates are respectively installed on both sides of the pump body, two gear shafts are cooperatively penetrated through the two side plates, the two gear shafts are arranged up and down and mesh with each other, and the gear shafts divide the inner cavity of the pump body into a suction area and an extrusion area. Material ports are respectively opened on the two side walls of the pump body close to the suction area and the extrusion area. The characteristics are as follows: two sliding bearings and two sealing sleeves are sleeved on the gear shafts, the two sliding bearings are respectively located on both sides of the gear position on the gear shafts, lubrication grooves are opened on the inner walls of the sliding bearings, so that the molten material can flow between the sliding bearings and the gear shafts to facilitate the lubrication of the sliding bearings; the sealing sleeves are inserted into the through holes of the side plates from the outside of the pump body, spiral grooves are opened on the inner walls of the sealing sleeves, and the spiral direction of the spiral grooves is opposite to the rotation direction of the gear shafts to facilitate restricting the flow of the material between the spiral grooves and the outer walls of the gear shafts. An end cover is installed at one end of the sealing sleeve located outside the pump body, a felt is installed on the joint surface of the end cover and the sealing sleeve, a heat source flow channel surrounding the gear shafts and the sliding bearings is opened inside the pump body, a heat source flow channel surrounding the sealing sleeves is opened inside the side plates, and a cooling flow channel is opened at one end of the sealing sleeve located outside the pump body;
[0005] One end of the gear shaft is axially provided with a rotating sleeve, and a rotary joint is installed on the rotating sleeve. The rotary joint penetrates the rotating sleeve and is connected to an inner pipe located in the central hole of the gear shaft, so as to facilitate the delivery of cooling water into the central hole of the gear shaft. An annular return cavity is formed between the outer wall of the inner pipe and the central hole of the gear shaft. The rotating sleeve is provided with a return hole, and both ends of the return hole are respectively connected to the annular return cavity and the rotary joint;
[0006] A discharge valve and a discharge pipe are installed on one of the side plates of the pump body. A return flow channel is also opened inside the side plate. The inlet of the discharge valve faces the gap between the sliding bearing and the end of the sealing sleeve. The outlet of the discharge valve can face the discharge pipe or the inlet of the return flow channel, and the outlet of the return flow channel faces the suction area of the pump body cavity.
[0007] Preferably, two discharge valves and two discharge pipes are installed on the side plate of the pump body far from the rotary joint. The two discharge valves can respectively send the material into two return flow channels, and the outlets of the two return flow channels are respectively close to the two gear shafts.
[0008] According to the above technical solution, the beneficial effects of the present utility model are as follows:
[0009] 1. The present utility model uses a sealing sleeve with spiral grooves and cooling channels. The spiral direction of the spiral grooves is opposite to the rotation direction of the gear shaft, which can restrict the flow of the material between the spiral grooves and the outer wall of the gear shaft, and at the same time be further cooled and solidified by the cooling water to form a self-seal, effectively preventing material leakage.
[0010] 2. The gear shaft of the present utility model is provided with an inner pipe in the central hole, and a rotary joint is installed at the end of the gear shaft through a rotating sleeve, which can make the cooling water flow into the inside of the gear shaft from the inner pipe and flow back to the rotary joint from the annular return cavity between the inner pipe and the central hole, which can fully cool the gear shaft, take away the heat generated by extrusion and friction, and at the same time, a heat source flow channel surrounding the gear shaft and the sliding bearing is opened inside the pump body, and the internal cooling and the heating method of the external heat source flow channel are cooperated with each other to finally effectively control the material within the required temperature range.
[0011] 3. The present utility model is provided with lubricating grooves on the inner wall of the sliding bearing, so that the molten material can flow to between the sliding bearing and the gear shaft, using the melt itself to lubricate the rotating gear shaft. At the same time, obtaining the melt without pressure from the suction cavity with a lower pressure can also reduce the sealing difficulty.
[0012] 4. The present utility model is provided with a discharge valve and a discharge pipe on the side plate, and a return flow channel is opened inside. The discharge valve can switch between the discharging state and the production state. In the discharging state, when the melt flows out of the discharge pipe, it means that the sliding bearing has been lubricated, and then the gear pump can be started and switched to the production state, enabling the personnel to intuitively judge the lubrication state of the sliding bearing and preventing the gear shaft from being started under the state of dry friction, playing a role in protecting the gear shaft. Description of the Drawings
[0013] Figure 1 is a three-dimensional schematic diagram of a gear pump;
[0014] Figure 2 is a front view sectional view of the gear pump;
[0015] Figure 3 is Figure 2 an enlarged view of the dashed area in
[0016] Reference numerals in the drawings: 1, pump body; 2, material port; 3, side plate; 4, sealing sleeve; 5, end cover; 6, gear shaft; 7, rotary joint; 8, discharge valve; 9, discharge pipe; 10, return flow channel; 11, heat source flow channel; 12, cooling flow channel; 13, sliding bearing; 14, inner pipe; 15, felt; 16, swivel sleeve; 17, return hole. Detailed Description of the Invention
[0017] Referring to the accompanying drawings, the detailed implementation is as follows:
[0018] As Figure 1 shown, a water-cooled sealed gear pump for an extrusion granulation system includes a pump body 1, side plates 3 are respectively installed on both sides of the pump body 1, two gear shafts 6 are cooperatively inserted through the two side plates 3, the two gear shafts 6 are arranged vertically and mesh with each other, and the gear shafts 6 divide the inner cavity of the pump body 1 into a suction area and an extrusion area, and material ports 2 are respectively opened on the two side walls of the pump body 1 close to the suction area and the extrusion area.
[0019] As Figure 2 , 3 shown, two sliding bearings 13 and two sealing sleeves 4 are sleeved on the gear shaft 6, the two sliding bearings 13 are respectively located on both sides of the gear position on the gear shaft 6, and lubricating grooves are opened on the inner walls of the sliding bearings 13, so that the molten material can flow between the sliding bearings 13 and the gear shaft 6, so as to facilitate lubrication of the sliding bearings 13, thereby using the melt itself to lubricate the rotating gear shaft 6. At the same time, obtaining the unpressurized melt from the suction area with a lower pressure can also reduce the sealing difficulty.
[0020] As Figure 2 shown, the sealing sleeve 4 is inserted into the through hole of the side plate 3 from the outside of the pump body 1, and spiral grooves are opened on the inner wall of the sealing sleeve 4, and the spiral direction of the spiral grooves is opposite to the rotation direction of the gear shaft 6, so as to restrict the flow of the material between the spiral grooves and the outer wall of the gear shaft 6, and can restrict the flow of the material between the spiral grooves and the outer wall of the gear shaft 6.
[0021] As Figure 2As shown in the figure, an end cover 5 is installed at one end of the sealing sleeve 4 located outside the pump body 1. A felt 15 is installed on the joint surface between the end cover 5 and the sealing sleeve 4. A heat source flow channel 11 surrounding the gear shaft 6 and the sliding bearing 13 is provided inside the pump body 1. A heat source flow channel 11 surrounding the sealing sleeve 4 is provided inside the side plate 3. A cooling flow channel 12 is provided at one end of the sealing sleeve 4 located outside the pump body 1. The material between the spiral groove and the outer wall of the gear shaft 6 will be further cooled and solidified by the cooling water to form a self-seal, effectively preventing material leakage.
[0022] As Figure 2 , 3 shown in the figure, a swivel sleeve 16 is installed at one end of the gear shaft 6 along the axial direction. A rotary joint 7 is installed on the swivel sleeve 16. The rotary joint 7 penetrates the swivel sleeve 16 and is connected to the inner tube 14 located in the central hole of the gear shaft 6, so as to facilitate the conveyance of cooling water into the central hole of the gear shaft 6. An annular return cavity is formed between the outer wall of the inner tube 14 and the central hole of the gear shaft 6. A return hole 17 is provided on the swivel sleeve 16. The two ends of the return hole 17 are respectively connected to the annular return cavity and the rotary joint 7. The cooling water can fully cool the gear shaft 6, taking away the heat generated by extrusion and friction. By cooperating with the internal cooling and the heating method of the external heat source flow channel, the material can be effectively controlled within the required temperature range.
[0023] As Figure 1 shown in the figure, two discharge valves 8 and two discharge pipes 9 are installed on one of the side plates 3 of the pump body 1. Two return flow channels 10 are also provided inside the side plate 3. The inlet of the discharge valve 8 faces the gap between the sliding bearing 13 and the end of the sealing sleeve 4. The outlet of the discharge valve 8 can face the inlet of the discharge pipe 9 or the return flow channel 10. The outlets of the two return flow channels 10 are respectively close to the two gear shafts 6, so that the material can flow back to the suction area of the inner cavity of the pump body 1. The discharge valve 8 can be used to switch between the discharging and production states. When in the discharging state, the outflow of the melt from the discharge pipe 9 indicates that the sliding bearing 13 has been lubricated, and then the gear pump can be started and switched to the production state, enabling personnel to intuitively judge the lubrication state of the sliding bearing and preventing the gear shaft from being started under the state of dry friction.
Claims
1. A water-cooled sealed gear pump for an extrusion granulation system, comprising a pump body (1), side plates (3) are respectively installed on both sides of the pump body (1), two gear shafts (6) are cooperatively penetrated through the two side plates (3), the two gear shafts (6) are arranged vertically and mesh with each other, the gear shafts (6) divide the inner cavity of the pump body (1) into a suction zone and an extrusion zone, material ports (2) are respectively opened on two side walls of the pump body (1) close to the suction zone and the extrusion zone, and it is characterized in that: Two sliding bearings (13) and two sealing sleeves (4) are sleeved on the gear shaft (6). The two sliding bearings (13) are respectively located on both sides of the gear position on the gear shaft (6). Lubricating grooves are provided on the inner walls of the sliding bearings (13), so that the molten material can flow between the sliding bearings (13) and the gear shaft (6) to facilitate the lubrication of the sliding bearings (13); The sealing sleeves (4) are inserted into the through holes of the side plates (3) from the outside of the pump body (1). Spiral grooves are provided on the inner walls of the sealing sleeves (4), and the spiral direction of the spiral grooves is opposite to the rotation direction of the gear shaft (6) to facilitate restricting the flow of the material between the spiral grooves and the outer wall of the gear shaft (6). An end cover (5) is installed at one end of the sealing sleeve (4) located outside the pump body (1). A felt (15) is installed on the joint surface of the end cover (5) and the sealing sleeve (4). A heat source flow channel (11) surrounding the gear shaft (6) and the sliding bearings (13) is provided inside the pump body (1), and a heat source flow channel (11) surrounding the sealing sleeve (4) is provided inside the side plate (3). A cooling flow channel (12) is provided at one end of the sealing sleeve (4) located outside the pump body (1); One end of the gear shaft (6) along the axial direction is provided with a swivel sleeve (16). A rotary joint (7) is installed on the swivel sleeve (16). The rotary joint (7) penetrates through the swivel sleeve (16) and is connected to an inner pipe (14) located in the central hole of the gear shaft (6) to facilitate the delivery of cooling water into the central hole of the gear shaft (6). An annular return cavity is formed between the outer wall of the inner pipe (14) and the central hole of the gear shaft (6). A return hole (17) is provided on the swivel sleeve (16), and both ends of the return hole (17) are respectively connected to the annular return cavity and the rotary joint (7); A discharge valve (8) and a discharge pipe (9) are installed on one of the side plates (3) of the pump body (1). A return flow channel (10) is also provided inside this side plate (3). The inlet of the discharge valve (8) faces the gap between the sliding bearing (13) and the end of the sealing sleeve (4). The outlet of the discharge valve (8) can face the discharge pipe (9) or the inlet of the return flow channel (10), and the outlet of the return flow channel (10) faces the suction area of the inner cavity of the pump body (1).
2. The water-cooled sealed gear pump for an extrusion granulation system according to claim 1, characterized in that: Two discharge valves (8) and two discharge pipes (9) are installed on the side plate (3) of the pump body (1) far from the rotary joint (7). The two discharge valves (8) can respectively send the material into two return flow channels (10), and the outlets of the two return flow channels (10) are respectively close to the two gear shafts (6).