Rotor and rotor pump comprising same

Abstract

The utility model discloses a rotor and a rotor pump, the rotor comprises a skeleton, the skeleton is provided with a plurality of first rotating blades, the outer wall of each first rotating blade is provided with a positioning hole, and the center of the skeleton is provided with a transmission cavity; the transmission shaft is in transmission connection with the transmission cavity; the framework is tightly sleeved with the flexible sleeve, the flexible sleeve is provided with a second rotating blade attached to the first rotating blade, the thickness of any section of the second rotating blade is kept consistent at all positions, and the inner wall of the second rotating blade is provided with a positioning column matched with the positioning hole. Compared with the prior art, the rotor provided by the utility model has the advantages of high precision, long service life and the like, and is very suitable for being applied to a high-load working environment.

Description

Technical Field

[0001] The utility model relates to the technical field of volumetric pumps, in particular to a rotor and a rotor pump comprising the same. Background Art

[0002] The rotor pump is a type of positive displacement pump, which consists of a rotating rotor and a stationary pump body. The two rotors are driven by a pair of synchronous gears to achieve synchronous and opposite rotation of the two rotors. The transmission part in the middle of the rotor adopts interference or overfitting to prevent the medium from leaking into the cavity. The working volume is changed by the relative movement between the rotor and the pump body, and the material is discharged by the squeezing effect of the rotating rotor, while leaving space on the other side to form a low pressure, so that the material can be continuously sucked in, thereby achieving continuous transportation of the medium.

[0003] Although the internal structure of the rotor pump is simple, the cross-sectional shape of the rotor is actually very complex and difficult to measure. It is extremely difficult to ensure that the two rotors are over-fitted during operation. If there is a deviation, it will cause biting. Therefore, it is necessary to wrap the outer layer of the metal frame of the rotor with soft tissue material, such as rubber, and use the elasticity of the rubber to compensate for the deviation in shape.

[0004] The existing rotor production generally uses a metal frame and a mold for rubber injection. Since the thickness of the rubber is not equal in different places, the actual size of the rubber will deviate from the preset size due to the difference in shrinkage rate when cooling, resulting in waste. Therefore, in this industry, the tolerance of the rotor is generally defined relatively wide, otherwise the scrap rate is extremely high. Even if the rotor meets the tolerance requirements, it is difficult to ensure that it is over-fitted with another rotor during operation, and the rubber of the out-of-tolerance part is prone to wear. Utility Model Content

[0005] The utility model aims to provide a rotor to improve the precision of the rotor.

[0006] According to the first aspect of the present invention, the rotor comprises:

[0007] A frame, which is provided with a plurality of first rotating blades, each of which has a positioning hole on its outer wall, and a transmission cavity is provided at the center of the frame;

[0008] A transmission shaft, which is drivingly connected to the transmission chamber;

[0009] A flexible sleeve is tightly sleeved outside the frame, the flexible sleeve is provided with a second rotating blade that fits the first rotating blade, the thickness of any cross section of the second rotating blade remains consistent everywhere, and the inner wall of the second rotating blade is provided with a positioning column that matches the positioning hole.

[0010] According to the rotor of the embodiment of the utility model, at least the following beneficial effects are achieved: before the rotor is formed, the skeleton needs to be placed in a mold. Since the inner cavity size of the mold is proportionally enlarged based on the outer size of the first rotating blade, when the molding fluid is injected into the mold, the shrinkage rate of the molding fluid at various locations remains consistent during cooling and molding, which is conducive to forming a high-precision flexible sleeve outside the skeleton and reducing the probability of local dimensional deviations, thereby better over-fitting with another rotor; in addition, since the outer wall of the first rotating blade is provided with a positioning hole, the molding fluid can form a corresponding positioning column in the positioning hole to strengthen the connection between the flexible sleeve and the skeleton, effectively prevent the flexible sleeve and the skeleton from slipping, and improve the transmission efficiency between the flexible sleeve and the skeleton; compared with the prior art, the rotor of the utility model has the advantages of high precision and long service life, and is very suitable for use in high-load working environments.

[0011] According to some embodiments of the present invention, in order to improve efficiency, the skeleton is provided with at least two of the first rotating blades, and all of the first rotating blades are evenly distributed around the central axis of the skeleton.

[0012] According to some embodiments of the utility model, each of the first rotating blades is provided with a front face and a rear face that are parallel to each other, and the front face of the first rotating blade and the rear face of the first rotating blade are deflected around the central axis of the skeleton. Such a setting can increase the contact area between the rotors, thereby suppressing the adverse factors caused by the tolerance.

[0013] According to some embodiments of the present invention, specifically, a deflection angle between a front end surface of the first rotating blade and a rear end surface of the first rotating blade is 20° to 40°.

[0014] According to some embodiments of the present invention, any point on the front end surface of the first rotating blade is connected to the corresponding point on the rear end surface of the first rotating blade by a straight line, so that the edge of the first rotating blade can transition smoothly, thereby avoiding interference between the two rotors when they contact each other.

[0015] According to some embodiments of the utility model, a keyway is provided in the transmission cavity, and the transmission shaft is detachably connected with a connecting key that matches the keyway, so that the transmission shaft can drive the skeleton to rotate.

[0016] According to some embodiments of the present invention, the skeleton is a metal material component, and the flexible sleeve is a rubber material component, so as to maintain consistency with the prior art.

[0017] The rotor pump according to the second aspect of the present invention comprises a pump body and the two rotors mentioned above, the pump body being provided with a volume cavity and a feed port and a discharge port respectively connected to the volume cavity, the two rotors being rotatably connected in the volume cavity via respective transmission shafts, the transmission shafts of the two rotors being transmission connected via a transmission pair, and any one of the transmission shafts being connected to a power source.

[0018] The rotor pump according to the embodiment of the utility model has at least the following beneficial effects: since the rotor pump adopts a rotor with higher dimensional accuracy, its working effect and service life are improved, and it has a good market prospect.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the rotor and the rotor in the embodiment of the utility model when they are matched;

[0022] Figure 2 yes Figure 1 A front view of the rotor shown;

[0023] Figure 3 yes Figure 1 The three-dimensional structure of the rotor is shown in the exploded view;

[0024] Figure 4 yes Figure 3 A partial cross-sectional view of the rotor shown;

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the rotor pump of an embodiment of the utility model;

[0026] Figure 6 yes Figure 5 A top view of the rotary pump shown;

[0027] Figure 7 yes Figure 6 The cross-sectional view of the rotor pump shown along the AA section line;

[0028] Figure 8 yes Figure 6 The cross-sectional view of the rotor pump shown along the BB section line;

[0029] Fig. 9 yes Figure 5 The three-dimensional structural exploded view of the rotor pump shown.

[0030] In the accompanying drawings: 100-skeleton, 200-transmission shaft, 300-flexible sleeve, 10-rotor, 110-transmission chamber, 111-keyway, 210-connecting key, 120-first rotating blade, 320-second rotating blade, 121-positioning hole, 20-pump body, 400-end cover, 500-bearing seat, 600-open box, 601-volume chamber, 700-bearing, 610-feed port, 620-discharge port, 800-gear. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] like Figures 1 to 3As shown, according to the rotor 10 of the first embodiment of the utility model, it includes a skeleton 100, a transmission shaft 200 and a flexible sleeve 300, wherein the skeleton 100 is a metal material component, which can be a steel alloy component, an iron alloy component, a copper alloy component or an aluminum alloy component. When the rotor 10 is applied to a rotor pump, the medium conveyed by the rotor pump is of various types, including but not limited to solid particles or fluids. In order to reduce the probability of corrosion of the rotor 10, the skeleton 100 should be selected as a steel alloy component or an aluminum alloy component. Considering the material strength and material cost, in this embodiment, the skeleton 100 is preferably a steel alloy component. A transmission cavity 110 is provided at the center of the skeleton 100, and a keyway 111 is provided in the transmission cavity 110. The surface of the transmission shaft 200 is also provided with a slot for accommodating a connection key 210. When the transmission shaft 200 is assembled with the frame 100 , since the connection key 210 on the transmission shaft 200 is placed in the keyway 111 , the transmission shaft 200 can drive the frame 100 to rotate to achieve transmission connection between the frame 100 and the transmission shaft 200 .

[0036] like Figure 3 and Figure 4 As shown, specifically, the skeleton 100 is provided with a plurality of first rotating blades 120. In this embodiment, the number of the first rotating blades 120 can be selected as three, and the three first rotating blades 120 are evenly distributed around the central axis of the skeleton 100. Each of the first rotating blades 120 is provided with a front end face and a rear end face that are parallel to each other, and the central axis of the skeleton 100 is perpendicular to the front end face and the rear end face of the first rotating blade 120. The front end face of the first rotating blade 120 and the rear end face of the first rotating blade 120 are deflected around the central axis of the skeleton 100, and the deflection angle can be selected to be 20° to 40°, and any point of the front end face of the first rotating blade 120 is connected to the corresponding point of the rear end face of the first rotating blade 120 by a straight line, so that the edge of the first rotating blade 120 can be smoothly transitioned, thereby avoiding interference between the two rotors 10 when they contact each other. The reason why the front and rear faces of the first rotating blade 120 are deflected is to increase the contact area between the rotors 10 and 10. Even if one rotor 10 cannot be perfectly overfitted with another rotor 10 due to tolerance, the contact area between the rotors 10 and 10 is increased so that the two can be overfitted through the inclined surface to suppress the adverse factors caused by the tolerance. It is understandable that the utility model does not limit the number of the first rotating blades 120, which can also be one, two, four, etc., and is not limited to the above embodiment.

[0037] It should be further explained that, for the above-mentioned deflection angle, if the deflection angle is less than 20°, the slope of the inclined surface is small and the effect is limited. If the deflection angle is greater than 40°, although the slope of the inclined surface is large, it is easy to deform during operation and is not conducive to use. Therefore, in this embodiment, the above-mentioned deflection angle can be selected as 30° to meet general use requirements.

[0038] Before the rotor 10 is formed, the skeleton 100 needs to be placed in a mold (not shown in the drawings). Since the inner cavity size of the mold is proportionally enlarged based on the outer size of the first rotating blade 120, when the molding fluid is injected into the mold, the shrinkage rate of the molding fluid at various locations during cooling and molding is consistent, which is conducive to forming a high-precision flexible sleeve 300 outside the skeleton 100, reducing the probability of local dimensional deviation, so as to better fit with another rotor 10. It can be seen that the flexible sleeve 300 is essentially connected to the outside of the skeleton 100 by gluing, and is provided with a second rotating blade 320 that fits the first rotating blade 120. The inner size of the second rotating blade 320 matches the outer size of the first rotating blade 120, and the outer size of the second rotating blade 320 is shrunk based on the inner size of the mold. Since the inner cavity size of the mold is proportionally enlarged based on the outer size of the first rotating blade 120, under the premise of a constant shrinkage rate, the thickness of any cross section (whether cross section or vertical section) of the second rotating blade 320 is consistent at various locations, so as to achieve the purpose of equal wall thickness.

[0039] It can be understood that the above-mentioned molding fluid can be selected as plasticized rubber that has not been vulcanized. Before the rotor 10 is formed, a release agent is first applied to the inner wall of the mold, and then the plasticized rubber is injected and kept warm. The plasticized rubber undergoes a vulcanization reaction under constant temperature conditions to obtain vulcanized rubber with excellent performance. Finally, the mold after constant temperature treatment is cooled so that the vulcanized rubber in the mold can be cooled and formed into a solidified flexible sleeve 300. The flexible sleeve 300 will shrink during curing, and its shrinkage rate is related to the material, shape, thickness and temperature of the rubber. By controlling the variables, it can be seen that as long as the thickness of the rubber is kept consistent everywhere, its shrinkage rate at various locations is also determined. The staff can produce a flexible sleeve 300 that meets the design requirements through calculation and verification.

[0040] In some embodiments of the utility model, when the rotor pump is working, the two rotors 10 rotate continuously, causing the outer rubber of the skeleton 100 to be squeezed continuously, which can easily cause the outer rubber and the skeleton 100 to loosen or slip, and in severe cases, even cause the two to separate, so that they cannot be used any more. In order to overcome this technical problem, the outer wall of each of the first rotating blades 120 is provided with a plurality of positioning holes 121, and the positioning holes 121 can be selected as vertical holes or horizontal holes, and the depth can be determined according to the maximum load of the rotor pump, generally not less than 3mm, but not more than 10mm. Since the flexible sleeve 300 is molded by injection molding, the molding fluid can mold corresponding positioning columns (not shown in the drawings) in the positioning holes 121 to strengthen the connection between the flexible sleeve 300 and the skeleton 100, effectively prevent the flexible sleeve 300 and the skeleton 100 from slipping, and improve the transmission efficiency between the flexible sleeve 300 and the skeleton 100.

[0041] like Figures 5 to 9 As shown, the rotor pump according to the second embodiment of the utility model comprises two rotors 10 according to the first embodiment of the utility model, and also comprises a pump body 20, wherein the pump body 20 is composed of an end cover 400, a bearing seat 500 and an open box 600, wherein the end cover 400, the bearing seat 500 and the open box 600 are connected in sequence, wherein the bearing seat 500 and the open box 600 jointly form a volume chamber 601, and the two sides of the open box 600 are respectively provided with a feed port 610 and a discharge port 620 connected to the volume chamber 601. One end of the transmission shaft 200 of each rotor 10 is rotatably connected to the bearing seat 500 through a bearing 700, and the other end thereof is rotatably connected to the open box 600 through a bearing 700, and at this time, the skeleton 100 and the flexible sleeve 300 are both located in the volume chamber 601.

[0042] The bearing seat 500 is provided with a gear groove on the side close to the end cover 400, and the gear groove is provided with two mutually meshing gears 800. The transmission shaft 200 of each rotor 10 penetrates the bearing seat 500 and is in transmission connection with the corresponding gear 800, and one of the transmission shafts 200 extends outside the end cover 400 and is rigidly connected with the power source. In this embodiment, the power source can be selected as a motor. When the power source drives the transmission shaft 200 connected thereto to rotate, under the action of the gear pair, the two transmission shafts 200 rotate synchronously in opposite directions. At this time, the two rotors 10 also rotate synchronously in opposite directions. The working volume is changed by the relative movement between the rotor 10 and the pump body 20, and the material is discharged from the discharge port 620 by the extrusion effect of the rotating rotor 10, and a space is left on the other side to form a low pressure, so that the material can be continuously sucked from the feed port 610, thereby realizing continuous conveying of the medium.

[0043] Since the rotor pump adopts the rotor 10 with higher dimensional accuracy, its working effect and service life are improved, and it has a good market prospect.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A rotor, characterized in that: include: A frame (100) is provided with a plurality of first rotating blades (120), the outer wall of each of the first rotating blades (120) is provided with a positioning hole (121), and a transmission cavity (110) is provided at the center of the frame (100); A transmission shaft (200) which is drivingly connected to the transmission chamber (110); A flexible sleeve (300) is tightly sleeved outside the frame (100), and the flexible sleeve (300) is provided with a second rotating blade (320) that fits the first rotating blade (120), and the thickness of any cross section of the second rotating blade (320) remains consistent at all locations, and the inner wall of the second rotating blade (320) is provided with a positioning column that matches the positioning hole (121).

2. The rotor according to claim 1, characterized in that: The skeleton (100) is provided with at least two of the first rotating blades (120), and all the first rotating blades (120) are evenly distributed around the central axis of the skeleton (100).

3. The rotor according to claim 2, characterized in that: Each of the first rotating blades (120) is provided with a front face and a rear face which are parallel to each other, and the front face of the first rotating blade (120) and the rear face of the first rotating blade (120) are deflected around the central axis of the skeleton (100).

4. The rotor according to claim 3, characterized in that: The deflection angle between the front end surface of the first rotating blade (120) and the rear end surface of the first rotating blade (120) is 20° to 40°.

5. The rotor according to claim 3, characterized in that: Any point on the front end surface of the first rotating blade (120) is connected to a corresponding point on the rear end surface of the first rotating blade (120) via a straight line.

6. The rotor according to claim 1, characterized in that: A keyway (111) is provided in the transmission cavity (110), and the transmission shaft (200) is detachably connected with a connecting key (210) that matches the keyway (111).

7. The rotor according to claim 1, characterized in that: The frame (100) is a metal material component, and the flexible sleeve (300) is a rubber material component.

8. Rotor pump, characterized in that: It comprises two rotors as claimed in any one of claims 1 to 7, and also comprises: a pump body (20), which is provided with a volume cavity (601) and a feed port (610) and a discharge port (620) respectively connected to the volume cavity (601), the two rotors (10) are rotatably connected in the volume cavity (601) through their own transmission shafts (200), the transmission shafts (200) of the two rotors (10) are transmission-connected through a transmission pair, and any one of the transmission shafts (200) is connected to a power source.

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