Plastic-coated rubber rotor for rotor pump

Abstract

The utility model relates to a plastic-coated rubber rotor for a rotor pump. The plastic-coated rubber rotor comprises a metal core, at least two rotating blades which are uniformly arranged at equal angles in the circumferential direction are outwards formed on the outer wall of the side surface of the metal core; the rubber rotor sleeve is tightly adhered and coated on the outer wall of the side surface of the metal core and the outer wall of the side surface of each rotating blade along the outline trend of the metal core; the plastic wear-resistant sleeve is tightly adhered and coated on the outer wall of the side surface of the rubber rotor sleeve along the outline trend of the rubber rotor sleeve; according to the utility model, the service life of the rubber rotor sleeve is effectively prolonged, so that the frequency of replacing the rotor is greatly reduced, and the use cost of the rotor pump is greatly reduced; the phenomenon that the two rotors are stuck is thoroughly avoided, so that the use effect is remarkably improved; in addition, the passing ability of hard impurities between the two rotors is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotor pumps, in particular to a plastic-coated rubber rotor for a rotor pump. Background Art

[0002] The rotor pump is a common form of positive displacement pump. It consists of a rotating rotor and a stationary pump body. It has no suction or discharge valves. The working volume is changed by the relative movement between the two rotors and the pump body, and the liquid is discharged by the squeezing action of the two rotating rotors. At the same time, space is left on the other side to form a low pressure, so that the liquid can be continuously sucked in.

[0003] The rotors of existing rotor pumps are mostly rubber rotors, that is, a layer of rubber sleeve is wrapped around the outside of the metal rotor core. However, due to the poor wear resistance and low strength of the rubber material, hard impurities such as sand and gravel in the liquid can easily cause considerable damage to the rubber sleeve when passing through the two rotors; and due to the low smoothness of the outer surface of the rubber sleeve, the passability of hard impurities between the two rotors is also poor, and in severe cases, the two rotors may be stuck, so the use effect is poor; in addition, the damaged rubber sleeve will affect the sealing of the meshing point of the two rotors, thereby causing the rated pressure value in the pump body to drop, thereby affecting the working efficiency of the rotor pump, which can only be solved by replacing the rotor, which leads to a very short service life of the rotor (the actual effective operating time is less than 200 hours), and this method causes waste of the rotor and increases the use cost of the rotor pump, so it needs further improvement. Utility Model Content

[0004] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a plastic-coated rubber rotor for a rotor pump which effectively prolongs the service life to greatly reduce the use cost of the rotor pump, completely avoids the occurrence of sticking to significantly improve the use effect, and greatly improves the permeability of hard impurities.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a plastic-coated rubber rotor for a rotor pump, comprising a metal core; a positioning hole is opened between the top center and the bottom center of the metal core, a plurality of positioning convex strips uniformly distributed at equal angles along the circumferential direction are formed on the inner wall of the positioning hole toward the inside of the positioning hole, and at least two rotating blades uniformly arranged at equal angles along the circumferential direction are formed on the outer side wall of the metal core, characterized in that:

[0006] It also includes a rubber rotor sleeve tightly bonded and coated on the side outer wall of the metal core and the side outer wall of each rotor blade along the contour of the metal core, and the upper and lower surfaces of the rubber rotor sleeve are also provided with a plurality of holes distributed in sequence along the contour of the rubber rotor sleeve;

[0007] It also includes a plastic wear-resistant sleeve which is tightly bonded and coated on the outer wall of the side of the rubber rotor sleeve along the contour of the rubber rotor sleeve.

[0008] Preferably, the hole is a through hole or a blind hole.

[0009] Preferably, the thickness of the plastic wear-resistant sleeve is less than 4 mm.

[0010] Preferably, the thickness ratio of the plastic wear-resistant sleeve to the rubber rotor sleeve is less than 1:4.

[0011] Preferably, the plurality of holes located on the upper side of the rubber rotor sleeve are respectively arranged concentrically or staggered with the plurality of holes located on the lower side of the rubber rotor sleeve.

[0012] Preferably, the diameter of the hole is less than 90% of the thickness of the rubber rotor sleeve.

[0013] Compared with the prior art, the utility model has the following advantages: the utility model wraps a layer of plastic wear-resistant sleeve with a thickness of less than 4 mm on the surface of the rubber rotor sleeve. Since the strength, self-lubrication and wear resistance of the plastic wear-resistant sleeve are much better than those of the rubber rotor sleeve, when hard impurities contact the plastic wear-resistant sleeve, the damage to the plastic wear-resistant sleeve is negligible, and the rubber rotor sleeve will not be caused any damage, thereby effectively extending the service life of the rubber rotor sleeve (the actual effective operating time is more than 600 hours), thereby greatly reducing the frequency of replacing the rotor and greatly reducing the use cost of the rotor pump; and once the hard impurities are clamped by the two rotors, they can also use their own elasticity and the multiple holes in the rubber rotor sleeve to adaptively deform to avoid the hard impurities, thereby completely avoiding the phenomenon of the two rotors being stuck and significantly improving the use effect; in addition, due to the high surface smoothness of the plastic wear-resistant sleeve, the passability of the hard impurities between the two rotors is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top-side structural diagram of the utility model;

[0015] Figure 2 It is a top view of the structure of the utility model;

[0016] Figure 3 This is a diagram of the use state of the utility model;

[0017] Figure 4 It is a top-side exploded structural diagram when the lower end of each second core rod in the processing mold used for producing the utility model is fixed on the bottom mold;

[0018] Figure 5 A top-side exploded structural diagram of a processing mold used to produce the utility model when the lower end of each second core rod is fixed on the molding mold halves;

[0019] Figure 6 It is a structural diagram of the top mold used in the processing mold of the utility model from the upward side. DETAILED DESCRIPTION

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0022] like Figures 1 to 3 As shown, a plastic-coated rubber rotor for a rotor pump includes a metal core 1; a positioning hole 101 is opened between the top center and the bottom center of the metal core 1, and a plurality of positioning convex strips 102 are formed on the inner wall of the positioning hole 101 and are evenly distributed at equal angles along the circumferential direction toward the inside of the positioning hole 101, and at least two rotor blades 103 are evenly arranged at equal angles along the circumferential direction on the side outer wall of the metal core 1.

[0023] It also includes a rubber rotor sleeve 2 which is tightly bonded and coated on the side outer wall of the metal core 1 and the side outer wall of each rotor blade 103 along the contour of the metal core 1. The upper and lower surfaces of the rubber rotor sleeve 2 are also provided with a plurality of holes 21 which are distributed in sequence along the contour of the rubber rotor sleeve 2. The holes 21 are through holes or blind holes.

[0024] It also includes a plastic wear-resistant sleeve 3 which is tightly bonded and coated on the outer wall of the side of the rubber rotor sleeve 2 along the contour of the rubber rotor sleeve 2 .

[0025] The thickness of the plastic wear-resistant sleeve 3 is less than 4 mm, and the thickness ratio of the plastic wear-resistant sleeve 3 to the rubber rotor sleeve 2 is less than 1:4.

[0026] The plurality of holes 21 located on the upper side of the rubber rotor sleeve 2 are respectively arranged concentrically or staggered with the plurality of holes 21 located on the lower side of the rubber rotor sleeve 2 .

[0027] The diameter of the hole 21 is less than 90% of the thickness of the rubber rotor sleeve 2 .

[0028] like Figures 4-5 As shown, a processing mold for a plastic-coated rubber rotor for a rotor pump includes a top mold 9, a middle mold assembly and a bottom mold 7 which are arranged in sequence from top to bottom, and also includes a core column 10 vertically fixed on the top of the bottom mold 7. A plurality of positioning grooves 1001 which are evenly distributed at equal angles along the circumferential direction are opened on the outer circumferential surface of the core column 10. The number of the positioning grooves 1001 is equal to the number of the positioning ridges 102, and the shapes and positions of the positioning grooves 1001 are respectively matched with the shapes and positions of the positioning ridges 102; the middle mold assembly includes at least two molding mold halves 8 which are evenly spliced ​​at equal angles along the circumferential direction on the periphery of the core column 10, and the bottom of each molding mold halves 8 is movably connected to the top of the bottom mold 7 so as to have the function of centripetal translation; the number of the molding mold halves 8 is equal to the number of the rotor blade lobes 103.

[0029] A concave cavity 81 for accommodating the rotating vane 103 is provided at the inner corner of each shaping mold half 8, and a first core rod combination and a second core rod combination are respectively distributed up and down inside each concave cavity 81. The first core rod combination includes a plurality of first core rods 13 which are vertically arranged and distributed in sequence along the inner wall contour of the concave cavity 81, and the second core rod combination includes a plurality of second core rods 12 which are vertically arranged and distributed in sequence along the inner wall contour of the concave cavity 81; the upper end of each first core rod 13 is fixed on the top mold 9, and the lower end of each second core rod 12 is fixed on the bottom mold 7 or the shaping mold half 8.

[0030] The multiple first core rods 13 in the first core rod combination are respectively arranged concentrically or staggered with the multiple second core rods 12 in the second core rod combination located thereunder; if the multiple first core rods 13 in the first core rod combination are respectively arranged concentrically with the multiple second core rods 12 in the second core rod combination located thereunder, the sum of the lengths of the first core rod 13 and the second core rod 12 is less than or equal to the height of the metal core 1; if the multiple first core rods 13 in the first core rod combination are respectively staggered with the multiple second core rods 12 in the second core rod combination located thereunder, the length of the first core rod 13 or the second core rod 12 does not exceed the height of the metal core 1.

[0031] like Figure 6As shown, a frustum-shaped sinking cavity 91 is provided at the bottom of the top mold 9, and correspondingly, a conical arc surface 83 that cooperates with the inner wall of the frustum-shaped sinking cavity 91 is formed on the outer wall of each molding mold half 8, and the depth of the frustum-shaped sinking cavity 91 cooperates with the height of the molding mold half 8; a plurality of glue injection holes 92 are provided between the bottom surface of the frustum-shaped sinking cavity 91 and the top of the top mold 9, and the lower end opening of each glue injection hole 92 is interconnected with the interior of a corresponding concave cavity 81 and is arranged on the inner side of a corresponding first core rod combination and a second core rod combination; the upper end of each first core rod 13 is fixed on the bottom surface of the frustum-shaped sinking cavity 91.

[0032] The bottom of each molding die 8 is formed with a concentrically arranged fan-shaped block 82 downwardly, and a concentrically distributed arc-shaped notch 84 is opened at the center of each fan-shaped block 82. The inner wall of each arc-shaped notch 84 is arranged on the inner side or outer side of a corresponding first core rod combination and a second core rod combination. A cylindrical boss 71 is formed upwardly at the top of the bottom mold 7, and the lower end of the core column 10 is fixed on the top of the cylindrical boss 71. The outer peripheral surface of the cylindrical boss 71 cooperates with the inner wall of each arc-shaped notch 84.

[0033] If the inner wall of the arc-shaped notch 84 is arranged on the inner side of a corresponding first core rod combination and a second core rod combination, the lower end of each second core rod 12 is fixed to the top of a corresponding fan-shaped block 82; if the inner wall of the arc-shaped notch 84 is arranged on the outer side of a corresponding first core rod combination and a second core rod combination, the lower end of each second core rod 12 is fixed to the top of the cylindrical boss 71.

[0034] A method for processing a plastic-coated rubber rotor for a rotor pump comprises the following steps:

[0035] S1: placing an empty processing mold into a vulcanizing device to preheat the processing mold to a specified temperature (140-180° C.); degreasing and derusting the surface of the metal core 1 and roughening the surface by sandblasting and shot blasting, then cleaning and applying an adhesive on the surface, and drying for standby use;

[0036] S2: The preheated processing mold is taken out from the vulcanizing equipment, and the top mold 9 is vertically moved upward until the frustum-shaped sink cavity 91 is moved above the middle mold assembly, and then the metal core 1 is moved above the core column 10 so that each positioning convex strip 102 is located directly above a corresponding positioning groove 1001;

[0037] S3: Move the metal core 1 downward so that the stem 10 is inserted into the positioning hole 101 and each positioning ridge 102 is inserted into a corresponding positioning groove 1001, thereby fixing the metal core 1 and preventing it from rotating; each rotating vane 103 is arranged in a corresponding concave cavity 81 and is located on the inner side of each second core rod 12 in a corresponding second core rod assembly;

[0038] S4: Take a strip of plastic sheet 11 with a width equal to the height of the metal core 1 and a length matching the perimeter of the outer contour of the metal core 1, then clean and degrease the strip of plastic sheet 11, and then decide whether to activate and apply adhesive to the inner surface of the strip of plastic sheet 11 according to the material properties of the strip of plastic sheet 11 (based on the current technical level, only the strip of plastic sheet 11 made of ultra-high molecular weight polyethylene does not need to activate and apply adhesive to its inner surface, and only needs to be cleaned and degreased; while the strip of plastic sheet 11 made of other materials needs to activate and apply adhesive to its inner surface); overlap the two ends of the strip of plastic sheet 11 to form a closed loop shape and insert it downward into each cavity 81 and surround the outside of each second core rod combination;

[0039] S5: The top mold 9 is reinstalled to its original position so that the conical inner wall of the frustum-shaped sink cavity 91 fits on the conical arc surface 83 of each molding half 8 so that each molding half 8 fits tightly with each other. At this time, the bottom surface of the frustum-shaped sink cavity 91 fits on the top outer wall of each molding half 8; each first core rod assembly moves downward with the top mold 9 and extends into the inner side of the strip plastic sheet 11; at this time, the lower end opening of each injection hole 92 surrounds the outer side of a corresponding turning leaf 103 along the outer contour of the turning leaf 103, so as to prevent the injected rubber from directly impacting the strip plastic sheet 11 to prevent the strip plastic sheet 11 from deforming;

[0040] S6: Inject the molten rubber material (temperature of 50-90 degrees) into the closed loop area formed between each rotor blade 103 and each concave cavity 81 through each injection hole 92 and wrap it around the outside of each first core rod 13 and each second core rod 12; during the injection process, the rubber material will squeeze the strip plastic sheet 11 outward so that the outer wall of the strip plastic sheet 11 is tightly attached to the inner wall of each concave cavity 81; when the rubber material injected into the closed loop area formed between each rotor blade 103 and each concave cavity 81 is cooled, the rubber rotor sleeve 2 is formed;

[0041] S7: The entire processing mold is put back into the vulcanization equipment for vulcanization. The vulcanization temperature is 140-180 degrees, the pressure is 18 MPa, and the time is 30 to 60 minutes. During the vulcanization process, the inner wall of the rubber rotor cover 2 will be bonded and coated on the side outer wall of the metal core 1 and the side outer wall of each rotor blade 103 by means of the adhesive applied to the surface of the metal core 1 or its own material properties; the strip-shaped plastic sheet 11 will be heated and in a semi-melted state during the vulcanization process, and then bonded and coated on the outside of the rubber rotor cover 2 by means of the adhesive applied to its inner surface or its own and the material properties of the rubber rotor cover 2;

[0042] S8: The processing mold is taken out from the vulcanization equipment. The overlapping parts of the two ends of the strip-shaped plastic sheet 11 will be melted together due to heat during vulcanization, and then a closed plastic wear-resistant sleeve 3 is formed after cooling. Each first core rod 13 forms a corresponding hole 21 inside the upper side of the rubber rotor sleeve 2, and each second core rod 12 forms a corresponding hole 21 inside the lower side of the rubber rotor sleeve 2.

[0043] When the multiple first core rods 13 in the first core rod assembly are respectively arranged concentrically with the multiple second core rods 12 in the second core rod assembly located therebelow, if the sum of the lengths of a single first core rod 13 and a single second core rod 12 is greater than the height of the metal core 1, the hole 21 formed by each first core rod 13 and the hole 21 formed by a corresponding second core rod 12 will be interconnected to form a through hole; if the sum of the lengths of a single first core rod 13 and a single second core rod 12 is less than the height of the metal core 1, the hole 21 formed by each first core rod 13 and the hole 21 formed by each second core rod 12 are both blind holes;

[0044] When the plurality of first core rods 13 in the first core rod assembly are staggered with the plurality of second core rods 12 in the second core rod assembly located therebelow, the plurality of holes 21 formed by the first core rods 13 and the plurality of holes 21 formed by the second core rods 12 are staggered; if the length of the first core rod 13 or the second core rod 12 is less than the height of the metal core 1, the holes 21 formed by each first core rod 13 or each second core rod 12 are blind holes; if the length of the first core rod 13 or the second core rod 12 is greater than the height of the metal core 1, the holes 21 formed by each first core rod 13 or each second core rod 12 are through holes;

[0045] S9: Remove the top mold 9 in the same way to synchronously pull each first core rod assembly away from the rubber rotor sleeve 2; if the lower end of each second core rod 12 is fixed on the bottom mold 7, each molding mold piece 8 in the middle mold assembly is translated outward to make the inner wall of each cavity 81 leave the outer wall at the corresponding position on the plastic wear-resistant sleeve 3, and then the molded rubber rotor is pulled upward with the help of a tool until the positioning hole 101 is completely separated from the core column 10; if the lower end of each second core rod 12 is fixed on the molding mold piece 8, each molding mold piece 8 in the middle mold assembly cannot be translated outward, but the molded rubber rotor is directly pulled upward until the positioning hole 101 is completely separated from the core column 10.

[0046] The benefits of the utility model during use are as follows: when hard impurities such as sand and gravel mixed in the fluid medium are clamped by the two rotors, the hard impurities will not contact the outer wall of the rubber rotor sleeve 2, but will contact the outer wall of the plastic wear-resistant sleeve 3. Since the outer wall of the plastic wear-resistant sleeve 3 has good wear resistance due to its own material properties, it will not cause damage to the plastic wear-resistant sleeve 3; at the same time, since the thickness of the plastic wear-resistant sleeve 3 is relatively thin, it has good elasticity, and since a plurality of holes 21 distributed in sequence along the contour of the rubber rotor sleeve 2 are provided between the upper and lower side surfaces of the rubber rotor sleeve 2, when the hard impurities are clamped by the two rotors, the hard impurities will squeeze the plastic wear-resistant sleeve 3 so that the plurality of holes 21 at this position are flattened and deformed due to their own material properties, thereby making the clamping position of the plastic wear-resistant sleeve 3 concave inward, so that the hard impurities can pass through the two rotors smoothly.

[0047] The utility model wraps a layer of plastic wear-resistant sleeve 3 with a thickness of less than 4 mm on the surface of the rubber rotor sleeve 2. Since the strength, self-lubrication and wear resistance of the plastic wear-resistant sleeve 3 are much better than those of the rubber rotor sleeve 2, when hard impurities contact the plastic wear-resistant sleeve 3, the damage to the plastic wear-resistant sleeve 3 is negligible, and the rubber rotor sleeve 2 will not be caused any damage, thereby effectively extending the service life of the rubber rotor sleeve 2 (the actual effective operating time is more than 600 hours), thereby greatly reducing the frequency of replacing the rotor and greatly reducing the use cost of the rotor pump; and once the hard impurities are clamped by the two rotors, they can also use their own elasticity and the multiple holes 21 provided in the rubber rotor sleeve 2 to adaptively deform to avoid the hard impurities, thereby completely avoiding the phenomenon of the two rotors being stuck and significantly improving the use effect; in addition, since the surface smoothness of the plastic wear-resistant sleeve 3 is relatively high, the passability of the hard impurities between the two rotors is greatly improved.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rubber rotor for a plastic-coated rotor pump, comprising a metal core; a positioning hole is formed between the top center and the bottom center of the metal core, a plurality of positioning convex strips are formed on the inner wall of the positioning hole and are evenly distributed at equal angles along the circumferential direction toward the inside of the positioning hole, and at least two rotating blades are formed on the outer wall of the side of the metal core and are evenly arranged at equal angles along the circumferential direction, characterized in that: It also includes a rubber rotor sleeve tightly bonded and coated on the side outer wall of the metal core and the side outer wall of each rotor blade along the contour of the metal core, and the upper and lower surfaces of the rubber rotor sleeve are also provided with a plurality of holes distributed in sequence along the contour of the rubber rotor sleeve; It also includes a plastic wear-resistant sleeve which is tightly bonded and coated on the outer wall of the side of the rubber rotor sleeve along the contour of the rubber rotor sleeve.

2. The rubber rotor for a plastic-coated rotor pump according to claim 1, characterized in that: The hole is a through hole or a blind hole.

3. The rubber rotor for a plastic-coated rotor pump according to claim 1, characterized in that: The thickness of the plastic wear-resistant sleeve is less than 4 mm.

4. The rubber rotor for a plastic-coated rotor pump according to claim 1, characterized in that: The thickness ratio of the plastic wear-resistant sleeve to the rubber rotor sleeve is less than 1:

4.

5. The rubber rotor for a plastic-coated rotor pump according to claim 1, characterized in that: The plurality of holes located on the upper side of the rubber rotor sleeve are respectively arranged concentrically or staggered with the plurality of holes located on the lower side of the rubber rotor sleeve.

6. The rubber rotor for a plastic-coated rotor pump according to claim 1, characterized in that: The diameter of the hole is less than 90% of the thickness of the rubber rotor sleeve.

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