A high-temperature resistant plastic centrifugal pump impeller and its manufacturing process

Abstract

The present invention relates to the technical field of centrifugal pump manufacturing, and discloses a high-temperature resistant plastic centrifugal pump impeller and its manufacturing process, including: a fixing plate made of PES material, a second water storage box and a first water storage box are fixedly connected to the bottom of the fixing plate, a drain valve is arranged at the bottom of the second water storage box, an inlet valve is arranged at the bottom of the first water storage box, blades are fixedly connected to the upper part of the fixing plate, the blades are made of PEEK material, a water passing groove is opened at the lower part of the fixing plate, and the water passing groove penetrates through the fixing plate and is opened inside the blades. A water retaining strip is fixedly connected to the upper part of the second water storage box, and the water retaining strip is located inside the water passing groove. In the present invention, the blades are made of PEEK material, and the PEEK material has excellent mechanical properties and temperature resistance characteristics. The fixing plate and the hub are made of PES material, and the PES material has good thermal stability, thereby improving the heat resistance and structural strength of the plastic centrifugal pump impeller in a high-temperature environment and extending the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pump manufacturing, and specifically to a high-temperature resistant plastic centrifugal pump impeller and its manufacturing process. Background Art

[0002] A centrifugal pump is a common type of pump device that uses the centrifugal force generated by the rotation of the impeller to transport liquids. During operation, the motor drives the impeller to rotate at high speed, and the liquid is thrown towards the edge of the impeller under the action of centrifugal force, thereby obtaining energy. A low-pressure area is formed in the center of the impeller, causing the liquid to be continuously sucked into the pump. Centrifugal pumps have the advantages of large flow rate, high efficiency, simple structure, and easy maintenance, and are widely used in industries such as industry, agriculture, construction, municipal administration, and new energy in nuclear power, and can meet various liquid transportation requirements.

[0003] Existing commonly used plastic centrifugal pumps are widely used in many industrial fields due to their light weight, low cost, strong corrosion resistance, and other characteristics.

[0004] However, with the increasing requirements of the industry for the temperature of the pumped medium, the stability of traditional plastic centrifugal pumps at high temperatures has become one of the key factors restricting their application. Especially in the chemical production process, when encountering high-viscosity or high-temperature liquids, ordinary plastic centrifugal pumps often cannot meet the requirements of long-term continuous operation, which not only reduces work efficiency but may also lead to safety accidents. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a high-temperature resistant plastic centrifugal pump impeller and its manufacturing process, which solves the problems that the existing plastic centrifugal pumps have poor stability at high temperatures, which will reduce work efficiency and lead to safety accidents.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A high-temperature resistant plastic centrifugal pump impeller, comprising: a fixing plate, the fixing plate is made of PES material, the bottom of the fixing plate is fixedly connected with a second water storage box and a first water storage box, a drain valve is arranged at the bottom of the second water storage box, an inlet valve is arranged at the bottom of the first water storage box, the upper part of the fixing plate is fixedly connected with blades, the blades are made of PEEK material, a water passing groove is opened at the lower part of the fixing plate, the water passing groove penetrates through the fixing plate and is opened inside the blades, a water blocking strip is fixedly connected to the upper part of the second water storage box, and the water blocking strip is located inside the water passing groove.

[0007] Preferably, a hub is arranged in the middle of the fixing plate, the hub protrudes from the outer wall of the fixing plate, and the hub is made of PES material.

[0008] Preferably, reinforcing ribs are arranged on the outer wall of the blades, and the reinforcing ribs are made of glass fiber reinforced PP material.

[0009] Preferably, a transition layer is provided between the blade and the fixing plate, and the transition layer is made of polyvinylidene fluoride material.

[0010] A manufacturing process for a high-temperature resistant plastic centrifugal pump impeller includes the following steps:

[0011] S1. Raw material preparation: Prepare PEEK, PES, glass fiber reinforced PP, and polyvinylidene fluoride, and then put the above materials into a dryer for drying treatment;

[0012] S2. Component manufacturing: Put the dried materials into the injection molding machine barrel respectively, injection mold them according to the shapes of the hub, blades, and fixing plate, and then arrange the reinforcing ribs on the outer wall of the blades and integrally injection mold them through the injection molding machine;

[0013] S3. Transition layer setting: Grind the root of the blade with a grinding wheel, and then injection mold polyvinylidene fluoride at the root of the blade;

[0014] S4. Integral injection molding connection: Integrally injection mold the blade with polyvinylidene fluoride and the fixing plate through the injection molding machine;

[0015] S5. Quality inspection and debugging: Conduct quality inspection on the manufactured impeller, including dimensional accuracy, appearance defects, and material properties, and then install the impeller on the centrifugal pump to test the operation efficiency and stability of the impeller.

[0016] Preferably, in S1, the temperature of PEEK in the dryer is controlled at 150 - 180 °C, and the drying time is controlled at 3 - 5 hours; the temperature of PES in the dryer is controlled at 120 - 140 °C, and the drying time is controlled at 3 - 5 hours; the temperature of glass fiber reinforced PP in the dryer is controlled at 130 - 170 °C, and the drying time is controlled at 3 - 5 hours; the temperature of polyvinylidene fluoride in the dryer is controlled at 80 - 100 °C, and the drying time is controlled at 2 - 3 hours.

[0017] Preferably, in S2, the melting temperature of the injection molding machine barrel of PEEK is controlled at 343 - 380 °C, the melting temperature of the injection molding machine barrel of PES is controlled at 300 - 320 °C, the melting temperature of the injection molding machine barrel of polyvinylidene fluoride is controlled at 160 - 180 °C, the melting temperature of the injection molding machine barrel of glass fiber reinforced PP is controlled at 200 - 260 °C, and the injection pressure of glass fiber reinforced PP is controlled at 60 - 120 MPa, and it is injection molded integrally inside the blade.

[0018] Preferably, in S3, the grit size of the grinding wheel is 80 - 120 mesh, the motor speed is controlled at 2800 - 3000 revolutions per minute, the feed rate is 0.05 - 0.1 mm each time during the grinding process, the grinding pressure is controlled at 5 - 10 N, and the surface roughness Ra is controlled at 3.2 - 6.3 μm after grinding.

[0019] Preferably, in S3, the injection pressure for polyvinylidene fluoride injection molding is controlled at 80 - 120 MPa, and the subsequent holding pressure is 10 - 20 seconds after injection molding.

[0020] Preferably, in S4, the melting temperature is controlled at 200 - 220 °C, and the injection pressure for PES is controlled at 120 - 150 MPa.

[0021] The present invention provides a high - temperature resistant plastic centrifugal pump impeller and its manufacturing process. It has the following beneficial effects:

[0022] 1. In the present invention, the blades are made of PEEK material. The PEEK material has excellent mechanical properties and temperature resistance characteristics. The fixing plate and the hub are made of PES material. The PES material has good thermal stability and can maintain good physical properties within a relatively wide temperature range. Thus, the heat resistance and structural strength of the plastic centrifugal pump impeller in a high - temperature environment are improved, and the service life is extended.

[0023] 2. In the present invention, the reinforcing ribs provided inside the blades can improve the strength of the blades. The reinforcing ribs are made of glass fiber - reinforced PP material, which not only reduces the self - weight but also effectively resists external impacts. Thus, the operating efficiency and safety of the pump are greatly improved, and the maintenance cost is reduced.

[0024] 3. In the present invention, the inlet valve can input coolant into the first water storage box. Then, after filling the first water storage box, it flows through the blades and absorbs the waste heat generated by the blades. At the same time, it can absorb the waste heat generated inside the fixing plate, and finally discharges from the drain valve to efficiently cool the impeller. Thus, the high - temperature problem that traditional plastic centrifugal pumps are difficult to overcome is solved, and its application range is broadened. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of the present invention;

[0026] Figure 2 is a bottom perspective view of the present invention;

[0027] Figure 3 is a structural installation schematic diagram of the present invention;

[0028] Figure 4 is a schematic diagram of the bottom surface structure of the fixing plate of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of the first water storage box and the second water storage box of the present invention;

[0030] Figure 6 Schematic plan view of the transition layer of the present invention;

[0031] Figure 7 Schematic diagram of the manufacturing process steps of the present invention.

[0032] Among them, 1, hub; 2, blade; 3, reinforcing rib; 4, fixing plate; 5, transition layer; 6, water inlet valve; 7, drain valve; 8, water overflow tank; 9, water baffle; 10, first water storage box; 11, second water storage box. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to the attached Figure 2 and the attached Figure 4 and the attached Figure 5 , an embodiment of the present invention provides a high-temperature resistant plastic centrifugal pump impeller, including: a fixing plate 4 made of PES material, the bottom of the fixing plate 4 is fixedly connected with a second water storage box 11 and a first water storage box 10, a drain valve 7 is arranged at the bottom of the second water storage box 11, a water inlet valve 6 is arranged at the bottom of the first water storage box 10, the upper part of the fixing plate 4 is fixedly connected with a blade 2 made of PEEK material, a water overflow tank 8 is opened at the lower part of the fixing plate 4, the water overflow tank 8 penetrates through the fixing plate 4 and is opened inside the blade 2, a water baffle 9 is fixedly connected to the upper part of the second water storage box 11, and the water baffle 9 is located inside the water overflow tank 8.

[0035] The fixing plate 4 can support and fix the main components of the impeller, combining components such as the blade 2, the hub 1, the first water storage box 10, and the second water storage box 11 into an organic whole, ensuring the stability of the impeller structure, enabling the components to operate in coordination during work, and at the same time being able to take away part of the heat generated during the operation of the impeller, assisting in realizing the heat dissipation function of parts such as the blade 2, and thus helping to improve the stability and performance of the impeller in a high-temperature environment. The fixing plate 4 is made of PES material, which can maintain good physical properties within a wide temperature range, can maintain its own shape and performance stability in a high-temperature environment, ensure that the overall structure of the impeller does not deform due to problems such as material softening under high-temperature working conditions, and guarantee the normal operation of the centrifugal pump. The characteristics of this material provide the fixing plate 4 with sufficient structural strength, can reliably support and fix components such as the blade 2, the hub 1, the first water storage box 10, and the second water storage box 11, so that when the impeller rotates at high speed driven by the pump shaft, the components are firmly connected, maintaining the integrity and reliability of the overall structure of the impeller, and reducing the risk of failures caused by component loosening. The good corrosion resistance of the PES material allows the fixing plate 4 to be not easily eroded when contacting corrosive liquids or chemical substances, thereby extending the service life of the impeller, reducing maintenance costs, and ensuring the long-term stable operation of the centrifugal pump. The second water storage box 11 and the first water storage box 10 cooperate to construct a complete cooling circulation system. Through this circulation mechanism, cooling water is continuously supplied to the impeller to take away heat, thus maintaining the continuity of the entire cooling process and ensuring that the impeller can be in a suitable working temperature range for a long time. The coolant can be input through the inlet valve 6, and the coolant carrying heat can be output through the drain valve 7. The lower part of the fixing plate 4 is provided with a water passing groove 8 that penetrates the fixing plate 4 and extends into the blade 2. The inlet valve 6 is arranged at the bottom of the first water storage box 10, and the drain valve 7 is arranged at the bottom of the second water storage box 11. During the working process, water is introduced into the first water storage box 10 through the inlet valve 6, and the water can flow through the water passing groove 8 to take away the heat generated during the operation of the impeller, and then is discharged from the drain valve 7 through the second water storage box 11. This process realizes water-cooled heat dissipation, preventing problems such as performance degradation and material deformation of the impeller due to high temperature, and ensuring the stable operation of the impeller in a high-temperature environment. The blade 2 is made of PEEK material and its surface is specially treated to increase the friction coefficient. During the process of transporting liquid, it can effectively reduce the energy loss during operation, help improve the operating efficiency of the pump, and make the energy be utilized more reasonably.According to different usage requirements, the type of blade material can be appropriately adjusted. For example, it can be changed to PTFE to enhance chemical inertness, or the hub material can be changed to PA66 to further reduce the noise level. Also, the general outline of the impeller can be made of a metal material first, and then a layer of plastic material can be coated on the outside of the impeller to improve the overall structural strength and corrosion resistance. The PEEK material has excellent mechanical properties and temperature resistance characteristics. In a high-temperature environment, the blade 2 can still maintain good performance, maintain high strength and stability, ensure that the centrifugal pump can continue to operate stably under high-temperature conditions, and avoid problems such as insufficient strength and easy deformation caused by material softening, significantly improving the applicability of the centrifugal pump in a high-temperature environment. Through the water trough 8, the coolant flows from the first water storage box 10 through the inlet valve 6 into the water trough 8, absorbs the heat generated by the impeller during operation during the flow process, and then discharges from the second water storage box 11 through the drain valve 7, thereby taking away the heat and preventing problems such as performance degradation and material deformation of the impeller due to high temperature, ensuring the stable operation of the impeller in a high-temperature environment. Through the water baffle 9, the coolant can fully flow through the water trough 8, thereby fully dissipating heat from the blade 2.

[0036] Please refer to the appendix Figure 1 , in a preferred embodiment of the present invention, a hub 1 is provided in the middle of the fixing plate 4. The hub 1 protrudes from the outer wall of the fixing plate 4, and the hub 1 is made of PES material.

[0037] The hub 1 can play a role in fixing the rotating shaft, thereby transmitting the rotational force to the impeller. The hub 1 made of PES material can maintain good physical properties within a wide temperature range, can maintain its own shape and performance stability in a high-temperature environment, and ensure that the overall structure of the impeller does not deform due to problems such as material softening under high-temperature conditions.

[0038] Please refer to the appendix Figure 1 and the appendix Figure 3 , in a preferred embodiment of the present invention, a reinforcing rib 3 is provided on the outer wall of the blade 2. The reinforcing rib 3 is made of glass fiber-reinforced PP material.

[0039] The reinforcing rib 3 is located on the outer wall of the blade 2, and the outer wall of the reinforcing rib 3 is flush with the outer wall of the blade 2, thus reducing the obstruction to the conveyed material. The overall structural rigidity of the impeller is enhanced by the reinforcing rib 3. During the high-speed rotation of the impeller, it can better resist the stresses generated by centrifugal force, liquid pressure, etc., reduce the deformation caused by uneven stress, and ensure that the impeller maintains a stable shape and performance during long-term operation. The reinforcing rib 3 is made of glass fiber-reinforced PP material. The addition of glass fiber significantly improves the mechanical properties of the PP material, making the reinforcing rib 3 have higher strength and rigidity. The glass fiber-reinforced PP material has a lower density, which can effectively reduce the overall weight of the impeller while meeting the structural strength requirements. At the same time, the glass fiber-reinforced PP material has certain high-temperature resistance and can be adapted to other high-temperature materials in the impeller, and still maintains good performance under high-temperature working conditions.

[0040] Please refer to the appendix Figure 6 , in a preferred embodiment of the present invention, a transition layer 5 is provided between the blade 2 and the fixing plate 4, and the transition layer 5 is made of polyvinylidene fluoride material.

[0041] Through the transition layer 5, a good bonding interface can be formed between the blade 2 and the fixing plate 4, thereby effectively improving the connection strength between the blade 2 and the fixing plate 4, ensuring that the connection part between the blade 2 and the fixing plate 4 is firm and reliable under working conditions such as high-speed rotation of the impeller, and avoiding problems such as loosening and falling off. There are differences in thermal performance parameters such as the coefficient of thermal expansion between PEEK and PES. In a high-temperature environment or a working condition with large temperature changes, this difference may generate thermal stress at the joint between the two. The transition layer 5 made of polyvinylidene fluoride material can buffer this thermal stress to a certain extent and reduce the risks of material deformation and cracking caused by thermal stress.

[0042] Please refer to the appendix Figure 7 , the embodiment of the present invention provides a manufacturing process for a high-temperature-resistant plastic centrifugal pump impeller, including the following steps:

[0043] S1. Raw material preparation: Prepare PEEK, PES, glass fiber-reinforced PP, and polyvinylidene fluoride, and then put the above materials into a dryer for drying treatment;

[0044] S2. Component manufacturing: Put the dried materials into the barrel of an injection molding machine respectively, and perform injection molding according to the shapes of the hub 1, the blade 2, and the fixing plate 4, and then arrange the reinforcing rib 3 on the outer wall of the blade 2 and integrally inject and connect through the injection molding machine;

[0045] S3. Transition layer setting: Grind the root of the blade 2 with a grinding wheel, and then inject polyvinylidene fluoride at the root of the blade 2;

[0046] S4. Integral injection molding connection: Integrally connect the blade 2 with PVD (Polyvinylidene Fluoride) and the fixed plate 4 through an injection molding machine;

[0047] S5. Quality inspection and debugging: Conduct quality inspection on the manufactured impeller, including dimensional accuracy, appearance defects, and material properties. Then install the impeller on a centrifugal pump to test the operating efficiency and stability of the impeller.

[0048] By drying PEEK, PES, glass fiber-reinforced PP, and polyvinylidene fluoride, it is possible to prevent moisture from turning into water vapor due to high temperature during the injection molding process, which may cause defects such as bubbles and voids inside the injection molded products. As a result, the surface of the injection molded parts is smoother and the structure is denser, improving the appearance quality and internal quality of the products. The drying treatment can effectively remove moisture, maintain the original excellent properties of the materials, and ensure that the mechanical properties and temperature resistance characteristics of PEEK, the thermal stability of PES, the strength of glass fiber-reinforced PP, and the chemical stability of polyvinylidene fluoride are not affected by moisture. Furthermore, it guarantees the reliability and durability of the impeller during use. At the same time, the fluidity of the dried materials is more stable, facilitating the precise control of parameters such as injection pressure and speed during the injection molding process, enabling the materials to fill the mold cavity more evenly, improving the success rate of injection molding and product accuracy, and contributing to a more efficient and stable production process. Through integral injection molding connection, the overall structure of the impeller becomes more integrated, and the force is more evenly distributed during operation. It avoids the stress concentration problem that may occur due to different connection methods, effectively enhancing the overall mechanical properties of the impeller and enabling it to withstand greater pressure and centrifugal force. By grinding the root of the blade 2 with a grinding wheel, it is beneficial for polyvinylidene fluoride to better infiltrate the root of the blade 2 during the injection molding process, thereby improving the bonding effect between the transition layer and the root of the blade 2 and ensuring the quality and reliability of the entire connection part. By integrally connecting the blade 2 with PVD and the fixed plate 4 through an injection molding machine, the connection between the materials becomes tighter, greatly improving the strength of the connection part, making the connection between the blade 2 and the hub 1 stable and reliable even under harsh working conditions such as high-speed rotation. Through quality inspection and debugging, the product quality can be ensured by controlling dimensional accuracy, detecting appearance defects, and inspecting material properties, the product performance can be optimized by improving operating efficiency and enhancing stability, and the use safety can be guaranteed by preventing potential safety hazards and meeting application standards.

[0049] Please refer to the appendix Figure 7, in a preferred embodiment of the present invention, in S1, the temperature of PEEK in the dryer is controlled at 150 - 180 °C, and the drying time is controlled at 3 - 5 hours; the temperature of PES in the dryer is controlled at 120 - 140 °C, and the drying time is controlled at 3 - 5 hours; the temperature of glass fiber reinforced PP in the dryer is controlled at 130 - 170 °C, and the drying time is controlled at 3 - 5 hours; the temperature of polyvinylidene fluoride in the dryer is controlled at 80 - 100 °C, and the drying time is controlled at 2 - 3 hours.

[0050] Through precise temperature and time, the moisture inside PEEK, PES, glass fiber reinforced PP, and polyvinylidene fluoride can be effectively removed.

[0051] Please refer to the attached Figure 7 , in a preferred embodiment of the present invention, in S2, the melting temperature of the barrel of the injection molding machine for PEEK is controlled at 343 - 380 °C, the melting temperature of the barrel of the injection molding machine for PES is controlled at 300 - 320 °C, the melting temperature of the barrel of the injection molding machine for polyvinylidene fluoride is controlled at 160 - 180 °C, the melting temperature of the barrel of the injection molding machine for glass fiber reinforced PP is controlled at 200 - 260 °C, the injection pressure of glass fiber reinforced PP is controlled at 60 - 120 MPa, and injection is integrally injection molded inside the blade 2.

[0052] By accurate melting temperature and injection pressure, the quality of integral injection molding can be improved.

[0053] Please refer to the attached Figure 7 , in a preferred embodiment of the present invention, in S3, the grit size of the grinding wheel is 80 - 120 mesh, the motor speed is controlled at 2800 - 3000 revolutions per minute, the feed rate of 0.05 - 0.1 mm is added each time during the grinding process, the grinding pressure is controlled at 5 - 10 N, and the surface roughness Ra is controlled at 3.2 - 6.3 μm after grinding.

[0054] By limiting the parameters of the tool, the formation of the surface roughness can be guaranteed. By having the surface roughness Ra at 3.2 - 6.3 μm, the bonding force between the root of the blade 2 and the polyvinylidene fluoride transition layer can be effectively increased, ensuring the connection quality.

[0055] Please refer to the attached Figure 7 , in a preferred embodiment of the present invention, in S3, the injection pressure of polyvinylidene fluoride injection is controlled at 80 - 120 MPa, and the subsequent pressure holding is 10 - 20 seconds after injection molding.

[0056] This helps the polyvinylidene fluoride to fully fill the mold cavity and tightly bond with the root of the blade 2, ensuring the injection molding quality of the transition layer.

[0057] Please refer to the attached Figure 7, in a preferred embodiment of the present invention, in S4, the melting temperature is controlled at 200 - 220 °C, and the injection pressure of PES is controlled at 120 - 150 MPa.

[0058] This is conducive to the full flow of the PES material and its tight fusion with the polyvinylidene fluoride transition layer, achieving a firm connection with the root of the PEEK blade 2.

[0059] Working principle: Prepare PEEK, PES, glass fiber reinforced PP, and polyvinylidene fluoride. Then, put the above materials into a dryer for drying treatment. Then, put the dried materials into the barrel of an injection molding machine and perform injection molding according to the shapes of the hub 1, the blade 2, and the fixing plate 4. Then, arrange the reinforcing ribs 3 on the outer wall of the blade 2 and integrally inject and connect them through the injection molding machine. Then, grind the root of the blade 2 with a grinding wheel. Then, inject polyvinylidene fluoride at the root of the blade 2. Then, integrally inject and connect the blade 2 with the polyvinylidene fluoride to the fixing plate 4 through the injection molding machine. Then, perform quality inspection on the manufactured impeller, including dimensional accuracy, appearance defects, and material properties. Then, install the impeller on a centrifugal pump to test the operating efficiency and stability of the impeller. Inject coolant into the first water storage box 10 through the water inlet valve 6. Then, the coolant fills the first water storage box 10 and then flows through the water trough 8 to fill the blade 2 and then flows to the second water storage box 11 to complete the cycle. The coolant carries waste heat and then discharges it from the drain valve 7.

[0060] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant plastic centrifugal pump impeller, comprising: A fixed plate (4), characterized in that the fixed plate (4) is made of PES material, a second water storage box (11) and a first water storage box (10) are fixedly connected at the bottom of the fixed plate (4), a drain valve (7) is provided at the bottom of the second water storage box (11), a water inlet valve (6) is provided at the bottom of the first water storage box (10), a blade (2) is fixedly connected to the upper part of the fixed plate (4), the blade (2) is made of PEEK material, a water groove (8) is provided at the lower part of the fixed plate (4), the water groove (8) passes through the interior of the blade (2) provided on the fixed plate (4), a water retaining bar (9) is fixedly connected to the upper part of the second water storage box (11), and the water retaining bar (9) is located inside the water groove (8); A hub (1) is provided in the middle of the fixing plate (4), the hub (1) protruding from the outer wall of the fixing plate (4), and the hub (1) is made of PES material; The outer wall of the blade (2) is provided with a reinforcing rib (3), and the reinforcing rib (3) is made of glass fiber reinforced PP material; A transition layer (5) is provided between the blade (2) and the fixing plate (4), and the transition layer (5) is made of polyvinylidene fluoride material.

2. A manufacturing process for a high temperature resistant plastic centrifugal pump impeller, used to manufacture a high temperature resistant plastic centrifugal pump impeller as claimed in claim 1, characterized in that: The following steps are involved: S1. Raw material preparation: prepare PEEK, PES, glass fiber reinforced PP and polyvinylidene fluoride, and then put the above materials into a dryer for drying; S2, parts manufacturing: the dried materials are placed into the barrel of an injection molding machine respectively, and injection molding is performed according to the shapes of the hub (1), the blades (2) and the fixing plate (4), and then the reinforcing ribs (3) are arranged on the outer wall of the blades (2) and connected by integral injection molding through the injection molding machine; S3, transition layer setting: grinding the root of the blade (2) with a grinding wheel, and then injection molding polyvinylidene fluoride at the root of the blade (2); S4, integral injection molding connection: integrally connecting the blade (2) with polyvinylidene fluoride and the fixing plate (4) by means of an injection molding machine; S5. Quality inspection and debugging: Carry out quality inspection on the manufactured impeller, including dimensional accuracy, appearance defects and material properties, and then install the impeller on the centrifugal pump to test the operating efficiency and stability of the impeller; In the S1, the temperature of PEEK in the dryer is controlled at 150-180°C, and the drying time is controlled at 3-5 hours. The temperature of PES in the dryer is controlled at 120-140°C, and the drying time is controlled at 3-5 hours. The temperature of glass fiber reinforced PP in the dryer is controlled at 130-170°C, and the drying time is controlled at 3-5 hours. The temperature of polyvinylidene fluoride in the dryer is controlled at 80-100°C, and the drying time is controlled at 2-3 hours. In S2, the melting temperature of the barrel of the injection molding machine for PEEK is controlled at 343-380°C, the melting temperature of the barrel of the injection molding machine for PES is controlled at 300-320°C, the melting temperature of the barrel of the injection molding machine for polyvinylidene fluoride is controlled at 160-180°C, the melting temperature of the barrel of the injection molding machine for glass fiber reinforced PP is controlled at 200-260°C, the injection pressure of the glass fiber reinforced PP is controlled at 60-120 MPa, and the PP is injected into the interior of the blade (2) for integral injection molding; The particle size of the grinding wheel in S3 is 80-120 meshes, the motor speed is controlled at 2800-3000 rpm, the feed amount is added by 0.05-0.1 mm each time during the grinding process, the grinding pressure is controlled at 5-10N, and the roughness Ra is controlled at 3.2-6.3 μm after grinding; The injection pressure of the polyvinylidene fluoride injection molding in S3 is controlled at 80-120 MPa, and the pressure is maintained for 10-20 seconds after the injection molding is completed.

3. The manufacturing process of a high temperature resistant plastic centrifugal pump impeller according to claim 2, characterized in that: In the S4, the melting temperature is controlled at 200-220° C., and the injection pressure of PES is controlled at 120-150 MPa.

Images