Sine pump with blocking slide, and method for manufacturing the same

Abstract

This invention provides an improved blocking device for sine pumps. [Solution] A blocking slide (38) for a pump, having a rotor contact region designed to be supported by a corrugated rotor collar of the pump, wherein the rotor contact region has a lateral rotor contact surface (50) designed in each case to be supported by the side surface of the rotor collar, and an upper rotor contact surface (52) designed to be supported by the radial outer surface of the rotor collar, wherein each of the lateral rotor contact surfaces (50) is formed as a conical curved surface, and the first radius of curvature in the lower region of the lateral rotor contact surface (50) that is away from the upper rotor contact surface (52) is smaller than the second radius of curvature in the upper region of the lateral rotor contact surface (50) that is close to the upper rotor contact surface (52).

Description

Technical Field

[0001] The present invention relates to a manufacturing method of a sine pump and a blocking slide for a sine pump. The sine pump is characterized in that a rotor has a collar that expands in the radial direction and rotates in a wave shape or a sine wave shape. A common suction and discharge chamber is provided in the pump housing, and a blocking device is formed therein. The device engages with the periphery of the rotor collar to prevent the backflow of the fluid supplied to the pump into the common suction / discharge chamber. This blocking device can have a blocking slide disposed on the rotor collar, and the blocking slide has a slot through which the rotor collar passes when it slides.

Background Art

[0002] Such slides are usually cut out from plastic blanks. To seal the pump chamber, it is essential to bring the slide and the rotor collar into contact (fluid seal) as closely as possible. However, in the case of the cut-out slides, only a flat contact surface can be obtained in each case.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, an object of the present invention is to provide an improved blocking device for a sine pump and an improved manufacturing method that can further reduce the backflow of the fluid supplied to the pump. Another object of the present invention is to provide a manufacturing method of a blocking slide that can be used in pumps in the food industry.

Means for Solving the Problems

[0004] These objects are achieved by the blocking slide according to claim 1, the pump according to claim 2, and the manufacturing method according to claim 8 or claim 10.

[0005] According to one embodiment, a blocking slide for a pump such as a sine pump has a rotor contact area designed to be supported by the corrugated rotor collar of the pump. The blocking slide is a substantially cubic component, with a slot on one side forming the rotor contact area, and is designed to be positioned on the rotor collar.

[0006] The rotor contact area has lateral rotor contact surfaces designed to be supported by each side of the rotor collar, and an upper rotor contact surface designed to be supported by the radial outer surface of the rotor collar. Thus, the lateral and upper rotor contact surfaces form the aforementioned slots provided in the blocking slide. This blocking slide can be positioned on the rotor collar and, by contacting the rotor collar during pump operation, seals the pump chamber of the pump, preventing the transferred fluid from flowing back from the discharge area to the suction area.

[0007] Each of the above-mentioned lateral rotor contact surfaces is formed as a conical curved surface, and the first radius of curvature in the lower region of the lateral rotor contact surface, which is farther away from the upper rotor contact surface, is smaller than the second radius of curvature in the upper region of the lateral rotor contact surface, which is close to the upper rotor contact surface. This allows the lateral rotor contact surface and the corrugated rotor collar to make contact over a wide area. This is because, in a corrugated rotor collar that extends radially outward, the radially inner region has a shorter circumference than the radially outer region, and therefore the curvature of the waveform is greater in the radially outer region where the waveform is stretched over a longer circumference.

[0008] According to another embodiment, a pump is provided having a rotor that is rotatable about a rotation axis and includes a rotor hub and a rotor collar that extends radially from the rotor hub and rotates in a wave-like manner; a pump housing that, together with the rotor, forms a pump chamber connecting a first suction / discharge chamber and a second suction / discharge chamber; and a blocking device disposed between the first suction / discharge chamber and the second suction / discharge chamber and having blocking slides that axially block the pump chamber on both sides of the rotor collar. Such a sine pump can be used in particular for transferring food because the pump chamber can be easily cleaned, and by positioning the pump chamber between the radially outer side of the rotor and the pump housing, contamination of the pumped fluid by lubricating oil or wear particles generated from the pump's drive shaft or drive unit can be avoided.

[0009] The blocking slide has lateral rotor contact surfaces, each supported by the sides of the rotor collar. The blocking slide also has an upper rotor contact surface, supported by the radially outer surface of the rotor collar. Each of the lateral rotor contact surfaces of the blocking slide is formed as a conical curved surface, and the first radius of curvature in the radially inner region of the lateral rotor contact surface, closer to the rotor hub, is smaller than the second radius of curvature in the radially outer region of the lateral rotor contact surface, adjacent to the upper rotor contact surface. As a result, surface contact can be achieved over the entire radial area of ​​the rotor collar, and the blocking slide effectively prevents fluid from flowing back against the direction of flow of the pump.

[0010] In a further embodiment, the upper rotor contact surface of the blocking slide can be a concave curved surface having a third radius of curvature corresponding to the radius of curvature of the radial outer surface of the rotor collar. As a result, the blocking slide and the rotor collar can be brought into surface contact, and the pump chamber can be well sealed at the radial outer end of the rotor collar.

[0011] In a further embodiment, the lower rotor contact surface of the blocking slide can be brought into contact with the radial outer surface of the rotor hub, and the lower rotor contact surface of the blocking slide is a concave surface having a fourth radius of curvature corresponding to the radius of curvature of the radial outer surface of the rotor hub. As a result, sealing performance can be improved even at the radial inner end of the blocking slide.

[0012] The blocking slide described above can be made of plastic material and can form a cavity within the blocking slide by having an outer shell and reinforcing ribs. Such a blocking slide is substantially composed of a relatively thin frame and can be manufactured, for example, by injection molding or 3D printing. As a result, in some embodiments, plastic materials such as polyamide, which are only approved for use in the food industry, can be used when processing by injection molding.

[0013] According to some embodiments, the outer shell and / or reinforcing ribs of the blocking slide can be made of a glass fiber-containing plastic material such as glass fiber-reinforced polyamide, providing a blocking slide with high mechanical strength and low wear.

[0014] At least a portion of the cavities in the blocking slide can be filled with a filler material. The filler material may be, for example, the same material used for the blocking slide body, or it may be a different material with material properties suitable for the intended application. A filled blocking slide is easier to clean and does not have cavities into which the fluid being transferred can enter. Alternatively, if the blocking slide does not need to be completely filled for the intended application, the cavities in the blocking slide can be left open.

[0015] According to another embodiment, a method for manufacturing a blocking slide for a sign pump is provided, comprising the steps of: preparing a glass fiber reinforced plastic material suitable for processing by injection molding; and manufacturing a blocking slide by injection molding the glass fiber reinforced plastic material.

[0016] As described in relation to other embodiments, a blocking slide manufactured by the method according to the present invention has rotor contact regions having lateral rotor contact surfaces designed to be supported on the sides of the rotor collar, and an upper rotor contact surface designed to be supported on the radially outer surface of the rotor collar. Each of the lateral rotor contact surfaces is formed as a conical curved surface, and the first radius of curvature in the lower region of the lateral rotor contact surface that is away from the upper rotor contact surface is smaller than the second radius of curvature in the upper region of the lateral rotor contact surface that is close to the upper rotor contact surface.

[0017] According to an improved example, the process of manufacturing a blocking slide by injection molding the above-mentioned glass fiber reinforced plastic material may include a step of manufacturing a blocking slide having an outer shell and at least one reinforcing rib positioned within the outer shell, thereby forming a cavity within the outer shell. As a result, even an injection molding process, which is generally only usable for manufacturing relatively thin-walled components, can be used to manufacture a blocking slide that has sufficient depth to make contact with the rotor collar over a large area and seal the pump chamber well. Furthermore, the method may also include a step of filling the cavity in the blocking slide with a filler. This prevents the pump-supplied fluid from entering the cavity in the blocking slide when the pump is operating.

[0018] In a further embodiment, a method for manufacturing a blocking slide for a sine pump is provided, wherein a plastic material is approved for food applications when processed by injection molding, and the method for manufacturing the blocking slide by injection molding the plastic material is provided. The blocking slide is installed in the rotor collar of a sine pump and has a shape suitable for preventing backflow of fluid against the direction of fluid flow. Thus, a blocking slide for a sine pump in the food sector can be easily manufactured using a starting material that is approved only for use in the food sector when processed by injection molding.

[0019] The above-mentioned plastic material can be a glass fiber reinforced plastic material. This will ensure sufficient mechanical strength for the blocking slide.

[0020] The above injection molding process for manufacturing a blocking slide may include the process of manufacturing a blocking slide having an outer shell and at least one reinforcing rib inside the outer shell, thereby forming a cavity within the outer shell. According to some embodiments, the cavity within the blocking slide can be filled with a filler, so that the filled blocking slide can be easily cleaned.

[0021] Further features and advantages of the present invention will become apparent from the following description and the referenced drawings. [Brief explanation of the drawing]

[0022] [Figure 1] A partial cross-sectional perspective view of the pump according to the present invention is shown. [Figure 2] Figure 1 shows a cross-sectional view of the pump. [Figure 3a] A blocking slide relating to one embodiment of the present invention is shown. [Figure 3b] Another diagram of the blocking slide shown in Figure 3a is shown. [Figure 3c] Figure 3a shows a cross-sectional view of the blocking slide. [Figure 4a] Schematically illustrate the radii of curvature of each region of the rotor collar in the pump shown in FIG. 1. [Figure 4b] Show a top view of the blocking slide shown in FIG. 3a, and also illustrate the radii of curvature of each region of the rotor collar in the pump shown in FIG. 1. [Figure 5] Show a flowchart of a method for manufacturing the blocking slide.

BEST MODE FOR CARRYING OUT THE INVENTION

[0023] FIGS. 1 and 2 show the pump 10 in a partial cross-sectional view. A rotor 14 including a rotor hub 16 and a rotor collar 18 that extends radially and rotates in a wavy manner is housed in an annular pump housing 12. Thereby, in a pump chamber 20 defined by the inner surface of the corresponding pump housing 12 and the outer surfaces of the rotor hub 16 and the rotor collar 18, the rotation of the rotor 14 provided with the rotor collar 18 causes the fluid supplied to the pump to be transferred from the suction side to the discharge side.

[0024] A blocking device 22, which will be described in detail later, prevents the fluid being transferred from flowing back from the discharge side to the suction side.

[0025] The pump 10 further has a bearing portion 24 to which a shaft 26 to which the rotor 14 is fixed is attached. The pump housing 12 is attached to the bearing portion 24, and one side of the shaft 26 is attached and protrudes into the pump housing 12.

[0026] Hereinafter, information regarding the axial direction refers to the rotation axis of the rotor 14, and information regarding the radial direction refers to the corresponding radial direction centered on the rotation axis.

[0027] In the illustrated embodiment, the pump housing 12 has a central annular housing member 28 and two axial housing members 30 and 32 in each case. The central housing member 28 and the axial housing members 30 and 32 are held together by a plurality of screw connections 34 using screws, washers, and nuts, and each screw connection 34 extends from the bearing portion 24 through all three housing members 28, 30, and 32. However, other fixing methods can be employed. For example, a method can be provided in which the housing members 28, 30, and 32 are fixed independently of each other and the pump housing 12 is fixed independently to the bearing portion 24, or a method can be provided in which the individual axial housing members 30 and 32 are fixed independently. This allows the pump 10 to be assembled and disassembled as a module.

[0028] The central annular housing member 28 has suction / discharge connection elements 36 that define suction / discharge areas within the pump chamber 20 and to which pipes (not shown) can be connected (see Figure 2).

[0029] The blocking device 22 has a blocking slide 38 and is designed to axially block the pump passage 20 on both sides of the rotor collar 18. The blocking slide 38 is located on the rotor collar 18 and is housed in a blocking slide chamber 40 within the pump housing 12.

[0030] Figures 3a to 3c show the blocking slide 38, respectively. According to one embodiment, the blocking slide 38 is a component manufactured from a plastic material by an injection molding process. In this manufacturing process, the blocking slide 38 has a frame manufactured by the injection molding process, and the frame has an outer shell 42 and reinforcing ribs 44 arranged within the outer shell 42, so that a cavity 46 is formed in the injection-molded blocking slide 38, and this cavity can be filled with a filler (not shown).

[0031] When manufacturing the blocking slide 38 by injection molding, there is an advantage on the one hand that plastic materials such as polyamide, which are only approved for food use, can be processed during injection molding, and on the other hand, there is an advantage that the mechanical properties of the plastic material used can be improved by incorporating, for example, glass fibers.

[0032] When manufacturing the blocking slide 38 by an injection molding process, the shape of each outer surface of the blocking slide 38 can also be selected so that the pump chamber 20 is sealed particularly well when the pump 10 is in operation.

[0033] When the pump 10 is operating, the rotor contact area 48 of the blocking slide 38 is in contact with the rotor collar 18 or the rotor hub 16 (see Figure 1). In the case of the blocking slide 38 according to one embodiment shown in Figures 3a to 3c, the lateral rotor contact surface 50 supported on the axial side surface of the rotor collar 18 when the pump 10 is operating is formed as a conically curved shell surface, and in each case, the first radius of curvature R1 in the lower region of the lateral rotor contact surface 50 that is supported near the radially inner end of the rotor collar 18 when the pump is operating is smaller than the second radius of curvature R2 in the upper region of the lateral rotor contact surface 50 that is supported near the radially outer end of the rotor collar 18 when the pump 10 is operating.

[0034] Therefore, according to the embodiments shown in Figures 3a to 3c, the lateral rotor contact surfaces 50 of the blocking slide 38 are not part of the cylindrical shell surface, but are formed such that the radius of curvature of each lateral rotor contact surface 50 continuously increases from the lower end (radially inward) to the upper end (radially outward). As a result, as shown in Figures 3a to 3b, the contact between the lateral rotor contact surfaces 50 and the side surface of the rotor collar 18 is improved.

[0035] Figure 4a shows a rotor 14 comprising a rotor hub 16 and a radially expanding sinusoidal rotor collar 18. In Figure 4a, projections A and B correspond to the rotational trajectories of the radially inner end (projection A) and radially outer end (projection B) of the rotor collar 18. Since the circumference of the radially inner end of the rotor collar 18 is smaller than the circumference of the radially outer end of the rotor collar 18, the slope of the sinusoidal curve defining the waveform of the rotor collar 18 is greater at the radially inner end than at the radially outer end of the rotor collar 18 (see also Figure 4b). Therefore, the lateral rotor contact surface 50 of the blocking slide 38 according to the illustrated embodiment conforms to the curvature of the side surface of the rotor collar 18, and since this curvature decreases from the radially inner end to the radially outer end, the contact between the blocking slide 38 and the rotor collar 18 is improved compared to a cylindrical rotor contact surface.

[0036] The blocking slide 38 shown in Figures 3a to 3c further has an upper rotor contact surface 52 that contacts the radial outer shell surface of the rotor collar 18 when the pump 10 is operating. According to some embodiments, as shown in Figure 3c, the upper rotor contact surface 52 can be provided as a concave curved surface having a radius of curvature R3 corresponding to the radius of curvature of the radial outer shell surface of the rotor collar 18. As a result, backflow of the transferred fluid is prevented and the sealing of the pump chamber at the radial outer end of the rotor collar 18 is also improved.

[0037] According to some embodiments, the lower rotor contact surface 54 of the blocking slide 38, which contacts the radially outer surface of the rotor hub 16 when the pump 10 is operating, can also be configured as a concave curved surface, and its radius of curvature R4 corresponds to the radius of curvature of the radially outer surface of the rotor hub 16. As a result, good sealing can be achieved even in the radially inner region of the pump chamber 20.

[0038] The external shape of the blocking slide 38 outside the rotor contact area 48 is determined by the configuration of the blocking slide chamber 40 of the blocking device 22 for a particular pump 10, and can be changed according to the design and requirements of the pump 10, such as whether the pump 10 is bidirectional or unidirectional, and what kind of fluid of what viscosity it is transferring.

[0039] According to another embodiment of the present invention, a manufacturing method is provided shown in Figure 5, wherein a glass fiber reinforced plastic material is prepared in step S1. For example, polyamide 66 with a glass fiber content of 35% is used to increase the mechanical strength of the blocking slide and reduce wear during pump operation.

[0040] In step S2, a blocking slide (for example, a blocking slide 38 as shown in Figures 3a to 3c) is manufactured by injection molding. Here, by forming a relatively thin outer shell 42 and reinforcing ribs 44 placed inside the outer shell 42 by injection molding, a mechanically stable blocking slide 38 can be formed overall, despite the manufacturing constraint that the wall thickness becomes relatively thin in the injection molding process.

[0041] As described above with reference to Figures 3a-3c and 4a-4b, the shape of the blocking slide can be freely adapted according to the requirements of each pump model by appropriately configuring the injection mold, thereby preventing backflow of the transferred fluid and ensuring a good seal of the pump chamber. Furthermore, the outer shape of the blocking slide outside the rotor contact area can also be adapted to the dimensions of the pump chamber and blocking slide chamber of a specific type of pump.

[0042] Next, in step S3, the cavity formed between the outer shell 42 and the reinforcing rib 44 of the blocking slide 38 can be filled with a filler such as polyurethane or the same material used to manufacture the blocking slide body.

[0043] Finally, in step S4, for example, the screw connection portion 34 of the pump housing 12 of the pump 10 shown in Figure 1 is loosened, and the blocking slide 38 is placed on the rotor collar 18 and inserted into the blocking slide chamber 40, thereby installing the blocking slide on the sine pump. In this way, the improved blocking slide 38 according to the present invention can be retrofitted to an existing pump, thereby improving the sealing performance of the pump chamber 20 even in existing pumps.

[0044] Depending on the modified form, the manufacturing method shown in Figure 5 can also be used with plastic materials that are not reinforced with glass fibers. Furthermore, the manufacturing method shown in Figure 5 can be used to produce blocking slides of any shape suitable for use in the pumps shown in Figures 1 and 2.

Claims

1. A blocking slide (38) for a pump (10), The pump (10) has a rotor contact region (48) designed to be supported by the corrugated rotor collar (18), and the rotor contact region (48) is In each case, the lateral rotor contact surface (50) is designed to be supported on the side of the rotor collar (18), and An upper rotor contact surface (52) designed to be supported by the radial outer surface of the rotor collar (18), It has, Each of the lateral rotor contact surfaces (50) is formed as a conical curved surface, and the first radius of curvature (R) in the lower region of the lateral rotor contact surface (50) that is separated from the upper rotor contact surface (52) １ ) is the second radius of curvature (R) in the upper region of the lateral rotor contact surface (50) that is close to the upper rotor contact surface (52). ２ Smaller than ) Blocking slide (38).

2. A rotor (14) that is rotatable about an axis of rotation and includes a rotor hub (16) and a rotor collar (18) that extends radially from the rotor hub (16) and rotates in a wave-like manner, Together with the rotor (14), the pump housing (12) forms a pump chamber (20) that connects the first suction / discharge chamber and the second suction / discharge chamber, and A blocking device (22) is positioned between the first suction / discharge chamber and the second suction / discharge chamber and has blocking slides (38) that axially block the pump chamber (20) on both sides of the rotor collar (18), A pump (10) having, The blocking slide (38) has lateral rotor contact surfaces (50) supported on the sides of the rotor collar (18), and an upper rotor contact surface (52) supported on the radial outer surface of the rotor collar (18). The lateral rotor contact surfaces of the blocking slide (38) are each formed as conical curved surfaces, and the first radius of curvature (R) of the lateral rotor contact surface (50) in the radially inward region close to the rotor hub (16) １ ) is the second radius of curvature (R) in the radially outer region of the lateral rotor contact surface (50) adjacent to the upper rotor contact surface (52). ２ Smaller than ) Pump (10).

3. The upper rotor contact surface (52) of the blocking slide (38) has a third radius of curvature (R) corresponding to the radius of curvature of the radial outer surface of the rotor collar (18). ３ The pump (10) according to claim 2, which has a concave curved surface.

4. The lower rotor contact surface (54) of the blocking slide (38) is in contact with the radial outer surface of the rotor hub (16), and the lower rotor contact surface (54) of the blocking slide (38) has a fourth radius of curvature (R) corresponding to the radius of curvature of the radial outer surface of the rotor hub (16). ４ A pump (10) according to any one of claims 2 or 3, having a concave curved surface.

5. The pump (10) according to any one of claims 2 to 4, wherein the blocking slide (38) is made of a plastic material and has an outer shell (42) and reinforcing ribs (44) so ​​that a cavity (46) is formed inside the blocking slide (38).

6. The pump (10) according to claim 5, wherein the outer shell (42) and / or reinforcing ribs (44) of the blocking slide (38) are made of a glass fiber-containing plastic material such as glass fiber reinforced polyamide.

7. The pump (10) according to any one of claims 4 or 5, wherein at least a portion of the cavity (46) of the blocking slide (38) is filled with a filler material.

8. A method for manufacturing a blocking slide (38) for a sine pump (10), A process for preparing a glass fiber reinforced plastic material suitable for processing by injection molding, and A process of manufacturing a blocking slide (38) by injection molding the aforementioned glass fiber reinforced plastic material, It includes, and the blocking slide (38) is, A lateral rotor contact surface (50) is designed in each case to be supported on the side of the rotor collar (18), and An upper rotor contact surface (52) designed to be supported by the radial outer surface of the rotor collar (18), It has a rotor contact region (48) having the following Each of the lateral rotor contact surfaces (50) is formed as a conical curved surface, and the first radius of curvature (R) in the lower region of the lateral rotor contact surface (50) that is separated from the upper rotor contact surface (52) １ ) is the second radius of curvature (R) in the upper region of the lateral rotor contact surface (50) that is close to the upper rotor contact surface (52). ２ Smaller than ) method.

9. The process of manufacturing a blocking slide (38) by injection molding the glass fiber reinforced plastic material includes the process of manufacturing a blocking slide (38) having an outer shell (42) and at least one reinforcing rib (44) disposed within the outer shell (42), thereby forming a cavity (46) within the outer shell (42), The above method further, The process includes filling the cavity (46) within the blocking slide (38) with a filler material. The method according to claim 1.

10. A method for manufacturing a blocking slide (38) for a sine pump (10), A plastic material suitable for processing by injection molding, comprising the process of preparing a plastic material approved for food use during injection molding, and A process of manufacturing a blocking slide (38) by injection molding the aforementioned plastic material, A method that includes this.

11. The method according to claim 10, wherein the plastic material is a glass fiber reinforced plastic material.

12. The step of injection molding to manufacture the blocking slide (38) includes the step of manufacturing a blocking slide (38) having an outer shell (42) and at least one reinforcing rib (44) disposed within the outer shell (42), thereby forming a cavity (46) within the outer shell (42), The above method further, The process includes filling the cavity (46) within the blocking slide (38) with a filler material. The method according to any one of claims 10 or 11.

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