Pump device and method of manufacturing the same

Abstract

To provide a pump device capable of being easily manufactured by providing a heating jacket for heating a fluid flow passage of a carrying liquid or a cooling jacket for cooling it.SOLUTION: According to one embodiment of the present invention, there is proposed a pump device including a jacket which is formed integrally with a pump casing and in which a cooling fluid or a heating fluid is accommodated, the jacket including a first portion which extends from an impeller-facing wall portion of the pump casing which faces a side plate or blades of the impeller and defines at least a part of a cylindrical wall surface, and a second portion which faces the impeller-facing wall portion of the pump casing, the first portion and the second portion being an integrally molded product in which the first portion and the second portion are connected by a curved surface.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pump device and a method for manufacturing the same. [Background technology]

[0002] Conventionally, pumps such as centrifugal pumps have been used to transport a carrier liquid (see Patent Document 1). A centrifugal pump includes a rotating shaft to which an impeller is fixed and a casing that houses the impeller and forms a liquid flow path. The rotating shaft is driven by a motor. The centrifugal pump pressurizes the liquid within the casing by rotating the impeller within the casing, and discharges the pressurized liquid to the outside through a discharge port.

[0003] Furthermore, conventionally, a cooling jacket may be provided around the motor to cool the motor that drives the pump (see Patent Document 2). In Patent Document 2, the cooling jacket is assembled from a cylindrical cooling jacket main body that surrounds the motor frame and jacket side plates that are attached to both axial ends of the cooling jacket main body, and is provided so as to surround the outer peripheral surface of the motor frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-181764 [Patent Document 2] Japanese Patent Application Laid-Open No. 2018-59497 Summary of the Invention [Problem to be solved by the invention]

[0005] When a pump device is used to transport, for example, sodium hydroxide solution, a drop in the temperature of the transported liquid can cause sodium hydroxide to precipitate and clog the gap between the pump casing and the impeller (wearing area), the gap between the main shaft and the impeller, or the shaft seal. Furthermore, depending on the transported liquid, maintaining a low temperature may be desirable. Therefore, it may be desirable to provide a jacket surrounding the pump casing to heat or cool the transported liquid. However, the pump has an inlet and outlet for the transported liquid, and the jacket covering the pump must be shaped to take into account the pump's inlet and outlet. This can result in a complex jacket shape, which can cause manufacturing problems.

[0006] For example, when a jacket is retrofitted to the pump casing (impeller casing) shown in Fig. 3, a side member defining a plane perpendicular to the rotation axis of the impeller and a cylindrical member configured to cover the suction port are prepared. Figs. 11 and 12 are diagrams showing an example of the side member viewed from a direction along the rotation axis of the impeller and a direction perpendicular to said direction. Figs. 13 and 14 are diagrams showing an example of the cylindrical member viewed from a direction along the flow path direction of the carrier liquid defined by the suction port and a direction perpendicular to said direction. As shown in Figs. 11 to 14, each of the cylindrical member 116 and the side member 120 is composed of two separate parts (116a, 116b, 120a, 120b) that sandwich the suction port 11A. Then, as shown in FIG. 15, the tubular member 116 and the side member 120 are welded to the pump casing 10, and a jacket 140 is provided to the pump device (see welded locations 130 surrounded by dashed lines in FIGS. 11 to 15). A tubular member configured to cover the discharge port 11B may also be attached by welding. In such an example, welding the components together is difficult, requiring a welding technician to perform advanced work, and the quality of the jacket 140 may vary. Furthermore, there are some parts of the connection that cannot be welded by back-strip welding, which may result in insufficient connection strength and may cause leakage due to corrosion or deterioration over time.

[0007] The present invention has been made to solve at least one of the above problems, and one of its objects is to provide a pump device that can be easily manufactured and is equipped with a heating jacket for heating or a cooling jacket for cooling the fluid flow path of the transport liquid. [Means for solving the problem]

[0008] According to one embodiment of the present invention, there is provided a pump device comprising: an impeller; a pump casing that houses the impeller, the pump casing having an inlet and a discharge port for a carrier liquid transported by the impeller and defining a fluid flow path through which the carrier liquid passes; and a jacket that is formed integrally with the pump casing and contains a cooling fluid or a heating fluid. The jacket has a first portion that extends from an impeller-facing wall portion of the pump casing that faces the side plate or blades of the impeller and defines at least a part of a cylindrical wall surface, and a second portion that faces the impeller-facing wall portion of the pump casing, the first portion and the second portion being integrally molded with a continuous curved surface.

[0009] According to another embodiment of the present invention, there is provided a manufacturing method for manufacturing a pump device according to an embodiment of the present invention, the method comprising providing the impeller and the pump casing, and applying an additive manufacturing technique to the pump casing to manufacture the jacket.

[0010] According to another embodiment of the present invention, a manufacturing method for manufacturing a pump device according to an embodiment of the present invention is proposed, the manufacturing method comprising manufacturing the pump casing and the jacket integrally by additive manufacturing techniques. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a pump device for transporting a liquid according to an embodiment. [Figure 2]FIG. 2 is a cross-sectional view showing the outline of the configuration of an impeller casing and a jacket of the present embodiment. [Figure 3] FIG. 1 is a diagram showing an example of an impeller casing of an existing pump device in which a jacket is not formed. [Figure 4] 10A and 10B are diagrams showing an example of a method for forming a jacket on an impeller casing. [Figure 5] 10A and 10B are diagrams showing an example of a method for integrally forming a pump casing and a jacket. [Figure 6] 10A and 10B are diagrams showing an example of a method for integrally forming a pump casing and a jacket. [Figure 7] FIG. 10 is a cross-sectional view showing an example of a modified impeller casing and jacket. [Figure 8] 10A and 10B show examples of cooling or warming fluid flow paths defined by an alternative jacket. [Figure 9] FIG. 10 is a cross-sectional view showing an example of a modified impeller casing and jacket. [Figure 10] FIG. 10 is a cross-sectional view showing an example of a schematic configuration of a pump device according to a modified example. [Figure 11] FIG. 10 is a diagram illustrating an example of a side member as viewed from a direction along the rotation axis of an impeller in a comparative example. [Figure 12] FIG. 10 is a diagram illustrating an example of a side member in a comparative example, viewed from a direction perpendicular to the direction along the rotation axis of the impeller. [Figure 13] 10 is a diagram showing an example of a cylindrical member in a comparative example, viewed from a direction along the flow path direction of the carrier liquid defined by the suction port. FIG. [Figure 14] 10 is a diagram showing an example of a cylindrical member in a comparative example, viewed from a direction perpendicular to a direction along a flow path of the carrier liquid defined by the suction port. FIG. [Figure 15] FIG. 10 is a diagram showing an example of a jacket formed by welding to a pump casing. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings described below, identical or corresponding components are designated by the same reference numerals, and redundant description will be omitted.

[0013] FIG. 1 is a cross-sectional view showing the schematic configuration of a pump device for transporting liquid according to one embodiment. The pump device 100 of this embodiment is a single-stage centrifugal pump. The pump device 100 includes a pump casing 10, an impeller 20 disposed within the pump casing 10, a rotating shaft 22 to which the impeller 20 is fixed, and two bearings 15 supporting the rotating shaft 22. The two bearings 15 are held in a bearing housing 16 fixed to the pump casing 10. The two bearings 15 are spaced apart along the rotating shaft 22. Each bearing 15 is made of a ball bearing. A mechanical seal 17 is disposed on the back side of the impeller 20 as a shaft sealing device. The mechanical seal 17 seals the gap between the rotating shaft 22 and the pump casing 10 while allowing the rotating shaft 22 to rotate freely. In this embodiment, the pump casing 10 is composed of a combination of an impeller casing 11 that houses the impeller 20, a seal casing (casing cover) 12 that houses the mechanical seal 17 and forms an airtight container (volute) together with the impeller casing 11, and a bearing bracket 13 that joins the seal casing 12 and the bearing housing 16 while ensuring maintenance space.

[0014] The pump casing 10 has a suction port 11A communicating with the impeller 20, a volute chamber 11C surrounding the impeller 20, and a discharge port 11B connected to the volute chamber 11C. In this embodiment, the suction port 11A opens along the rotating shaft 22, and the discharge port 11B opens on the outer periphery of the impeller 20 in a direction perpendicular to the rotating shaft 22. One end of the rotating shaft 22 is fixed to the impeller 20, so that the impeller 20 and the rotating shaft 22 can rotate together. The other end of the rotating shaft 22 is connected to a prime mover (e.g., an electric motor) (not shown). When the prime mover rotates the impeller 20 and the rotating shaft 22, the carrier liquid is sucked into the impeller 20 through the suction port 11A. The rotating impeller 20 imparts velocity energy to the carrier liquid, which is converted into pressure as the carrier liquid flows through the volute chamber 11C. The pressurized carrier liquid is discharged from the discharge port 11B.

[0015] The impeller 20 is a semi-open impeller having a main plate 20A and a plurality of blades 20B, and no side plate. In one embodiment, the impeller 20 may be a fully open impeller having a smaller main plate and no side plate. In another embodiment, the impeller 20 may have a side plate. The impeller 20 has a seal casing 12 arranged facing the main plate 20A, and an impeller casing 11 arranged facing the plurality of blades 20B, and is housed in a volute defined by the impeller casing 11 and the seal casing 12.

[0016] In this embodiment, the pump device 100 further includes a side plate 30 disposed opposite the suction side of the impeller 20. This side plate 30 is disposed within the impeller casing 11. The side plate 30 functions as a front shroud for the impeller 20 and is disposed so as to cover the suction side of the impeller 20. A gap is formed between the side plate 30 and the impeller 20, allowing the impeller 20 to rotate without contacting the side plate 30. In this embodiment, the side plate 30 is fixed to the inner surface of the impeller casing 11 and does not rotate. It should be noted that the pump device 100 does not necessarily include the side plate 30. Furthermore, for convenience, in this specification, regardless of whether the pump device 100 or the impeller has a side plate, the side on which the main plate 20A of the impeller 20 is formed (the left side in FIG. 1) will be referred to as the "main plate side," and the suction side opposite the side on which the main plate 20A is formed (the right side in FIG. 1) will be referred to as the "side plate side."

[0017] The pump device 100 further includes a jacket 40 that is integrally formed with the pump casing 10. FIG. 2 is a cross-sectional view showing the general configuration of the impeller casing and jacket of this embodiment. The jacket 40 is provided on a wall portion (impeller-facing wall portion) 110 of the impeller casing 11 that faces the blades 20B of the impeller 20. In other words, the jacket 40 is provided on the side plate side of the pump casing 10 (the right side in FIGS. 1 and 2). Note that, if the impeller 20 has a side plate, the impeller-facing wall portion 110 faces the side plate of the impeller 20. The jacket 40 is preferably connected to the pump casing 10 without using fasteners such as screws. For example, the jacket 40 is preferably larger than the impeller 20 when viewed in the axial direction of the rotating shaft 22. Furthermore, the jacket 40 is preferably larger than the volute chamber in the pump casing 10 in which the impeller 20 is disposed when viewed in the axial direction of the rotating shaft 22.

[0018] The jacket 40 of this embodiment has a generally cylindrical shape with a bottom, through which a portion 111 that defines the suction port 11A of the impeller casing 11 passes. The jacket 40 has a first portion 41 that extends from the impeller-facing wall portion 110 and defines at least a portion of the cylindrical wall surface, and a second portion 42 that faces the impeller-facing wall portion 110. The second portion 42 corresponds to the bottom of the cylindrical shape with a bottom. The portion 111 that defines the suction port 11A of the impeller casing 11 passes through the second portion 42. In other words, the first portion 41 of the jacket 40 is formed to surround the portion 111 that defines the suction port 11A of the impeller casing 11. The first portion 41 and the second portion 42 of the jacket 40 are integrally molded and connected by a curved surface 43.

[0019] A cooling fluid or a heating fluid is accommodated in the space defined by the jacket 40 and the impeller casing 11. The cooling fluid or the heating fluid may be a liquid such as tap water, industrial water, or antifreeze (e.g., propylene glycol), or a gas. The jacket 40 may be formed with an inlet and an outlet for the cooling fluid or the heating fluid, and the pump device 100 may be configured so that the cooling fluid or the heating fluid flows through the jacket 40. The pump device 100 may also include a circulation pump and a cold or heat source for circulating the cooling fluid or the heating fluid through the jacket 40.

[0020] Next, a description will be given of a method for manufacturing the pump device 100 equipped with the jacket 40. The jacket 40 of this embodiment can be manufactured by additive manufacturing (AM) technology.

[0021] As an example, the pump device 100 with the jacket 40 can be manufactured by forming the jacket 40 on an existing pump device that does not have a jacket 40. In other words, the pump device 100 with the jacket 40 can be manufactured by preparing an existing pump device and forming a jacket on the pump casing using additive manufacturing technology. FIG. 3 is a diagram showing an example of an impeller casing of an existing pump device that does not have a jacket 40, and FIG. 4 is a diagram showing an example of a method for forming a jacket on an impeller casing. The impeller casing 11 shown in FIG. 3 is identical to the impeller casing 11 shown in FIG. 2 except that the jacket 40 is not formed. To form the jacket 40 on the impeller casing 11, first, the impeller casing 11 is fixed to a base 60. The base 60 is designed to hold the impeller casing 11 at any angle. Then, the angle of the impeller casing 11 is adjusted using the base 60, and a material 64 is sintered with a laser 63 using a directed energy deposition (DED) method. The material 64 can be any material (metal powder, etc.) that can be used in the DED method, and may be the same material as the impeller casing 11 or a different material. The material 64 can be supplied by spraying it from a nozzle 62 onto the position where the laser is irradiated. 64 is deposited to form the jacket 40. As described above, the jacket 40 is configured to surround the suction port 11A defined by the impeller casing 11, and therefore, during the process of forming the jacket 40 on the impeller casing 11, it is advisable to change the angle at which the impeller casing 11 is held by the pedestal 60, as necessary.

[0022] As another example, a pump device 100 including a jacket 40 can be manufactured by integrally forming the pump casing 10 (impeller casing 11) and the jacket 40 using additive manufacturing technology. FIGS. 5 and 6 illustrate an example of a method for integrally forming the pump casing 10 and the jacket 40. In the example shown in FIGS. 5 and 6, the pump casing 10 and the jacket 40 are integrally formed using powder bed fusion. As shown in FIGS. 5 and 6, the build chamber vessel 74 is configured so that the vessel volume can be changed by vertically moving the base plate 75. Furthermore, a powder supply source 72 is configured to spread material 71 inside the build chamber vessel 74. Then, a light source (laser or electron beam) 73 irradiates the portion of the spread material 71 that corresponds to the object (pump casing 10 and jacket 40) to sinter the material 71. The material 71 can be any material (nylon resin, ceramic, metal) that can be used in powder bed fusion. Then, by repeatedly lowering the base plate 75 and spreading and sintering the material 71 inside the molding chamber container 74 using the powder supply source 72, the molded objects are stacked and the impeller casing 11 and jacket 40 are integrally formed as shown in Figure 6.

[0023] The pump device 100 of the embodiment described above includes a jacket 40 formed integrally with the pump casing 10. The jacket 40 includes a first portion 41 extending from the impeller-facing wall portion 110 of the pump casing 10 and defining a cylindrical wall surface, and a second portion 42 facing the impeller-facing wall portion 110. The first portion 41 and the second portion 42 are integrally molded and connected by a curved surface 43. This jacket 40 can be easily manufactured using additive manufacturing techniques, for example, and can be manufactured without using welding or other techniques that can cause quality variations depending on the engineer. Furthermore, because the first portion 41 and the second portion 42 are connected by the curved surface 43, stress concentration in the cooling fluid or the like can be reduced, particularly when a cooling fluid or a heating fluid is flowing through the jacket 40. Therefore, a pump device 100 can be provided that includes a heating jacket that can heat or a cooling jacket that can cool the fluid flow path of the carrier liquid.

[0024] (Variation 1) FIG. 7 is a cross-sectional view showing an example of a modified impeller casing and jacket. As shown in FIG. 7, the jacket 40A may further include a rib portion 44 spaced from the first portion 41 and connected to the impeller-facing wall portion 110 and the second portion 42 of the impeller casing 11. The provision of such a rib portion 44 improves the rigidity of the jacket 40A and increases the contact area between the pump casing and the cooling fluid or heating fluid, thereby improving heat exchange efficiency. Any number of rib portions 44 may be provided at any location within the jacket 40A. FIG. 8 is a diagram showing an example of a flow path for a cooling fluid or a heating fluid defined by the modified jacket. As indicated by reference numeral 40B in FIG. 8, the impeller casing may have a flow path 46 formed integrally along the impeller-facing wall portion 110, through which the cooling fluid or the like flows. This flow path 46 may be defined by the rib portion 44 connected to the impeller-facing wall portion 110 and the second portion 42 in the modified jacket 40A shown in FIG. 7. In the example shown in Fig. 8, the flow path 46 is defined to meander along the impeller-facing wall portion 110. When a location in the pump casing 10 that is particularly desired to be cooled or heated is known by simulation or measurement, the flow path 46 can be defined taking into account that location. The flow path 46 can maintain the temperature of the liquid being transported by the pump device 100 in an appropriate manner.

[0025] (Variation 2) FIG. 9 is a cross-sectional view showing an example of a modified impeller casing and jacket. In the example shown in FIG. 2, the first portion 41 of the jacket 40 extends in a direction parallel to the rotary shaft 22 and defines a cylindrical wall surface. In contrast, in the example shown in FIG. 9, the first portion 41C of the jacket 40C is configured to increase in diameter as it moves away from the impeller-facing wall portion 110. Also, in the example shown in FIG. 9, the second portion 42C of the jacket 40C, when viewed in the axial direction of the rotary shaft 22, is curved toward the impeller 20 (left side in FIG. 9) as it approaches the axial center (inlet port 11A) of the rotary shaft 22. This shape can be determined based on stress concentration within the jacket, such as through simulation or measurement. By forming the jacket into a curved shape based on stress concentration within the jacket, stress concentration within the jacket can be suppressed. Note that, in the example shown in FIG. 9, both the first portion 41C and the second portion 42C are different from those in the example shown in FIG. 2, but only one of them may be formed differently.

[0026] (Variation 3) In the above-described embodiment, the pump device 100 has an inlet 11A formed along the rotation axis 22 of the impeller 20, and an outlet 11B formed facing the outer periphery of the impeller 20. However, this is not limited to this example. For example, the inlet 211A and the outlet 211B may be substantially aligned as in a modified pump device 200 shown in FIG. 10 . In this case, as shown in FIG. 10 , the jacket 240 may be configured to cover a portion of the flow path defined by the pump casing 210 and connected to the inlet 211A. In FIG. 10 , components identical to or corresponding to those in FIG. 1 are denoted by reference numerals prefixed with “2,” and redundant description will be omitted. Also, in FIG. 10 , the region defined by the jacket 240 in which the cooling fluid or the heating fluid is accommodated is hatched. 10, the jacket 240 covers a portion of the flow path connected to the suction port 211A, and the first portion 241 of the jacket 240 has a cylindrical shape with a portion of the side surface missing. Such a jacket 240 can also be manufactured using additive manufacturing techniques, as described above with reference to FIG. 5 or 6. Furthermore, the pump device 200 may be arranged so that the rotation axis 222 of the impeller 220 is horizontal, or so that the rotation axis 222 of the impeller 220 is vertical.

[0027] The present embodiment described above can also be described as the following embodiment. [Mode 1] According to Mode 1, a pump device is proposed, comprising: an impeller; a pump casing that houses the impeller, the pump casing having an inlet and a discharge port for a carrier liquid transported by the impeller and defining a fluid flow path through which the carrier liquid passes; and a jacket formed integrally with the pump casing and containing a cooling fluid, the jacket having a first portion extending from an impeller-facing wall portion of the pump casing that faces the impeller's side plate or blades and defining at least a portion of a cylindrical wall surface, and a second portion facing the impeller-facing wall portion of the pump casing, the first portion and the second portion being integrally molded with a continuous curved surface. According to Mode 1, a pump device that can be easily manufactured can be provided, which includes a heating jacket for heating the fluid flow path of the carrier liquid or a cooling jacket for cooling the fluid flow path of the carrier liquid.

[0028] [Mode 2] According to Mode 2, in Mode 1, the jacket further has a rib portion spaced apart from the first portion and connected to the impeller-facing wall portion of the pump casing and the second portion. According to Mode 2, the rigidity of the jacket is improved and the pump casing The contact area between the casing and the cooling or heating fluid increases, improving the heat exchange efficiency.

[0029] [Mode 3] According to Mode 3, in Mode 1 or 2, the first portion of the jacket includes an expanding portion whose diameter increases with increasing distance from the impeller-facing wall portion of the pump casing. According to Mode 3, stress concentration within the jacket can be further suppressed.

[0030] [Mode 4] According to Mode 4, in any of Modes 1 to 3, the second portion of the jacket is formed with a curved surface, and a distance between the second portion and the impeller-facing wall at a first position of the second portion is a first distance, and a distance between the second portion and the impeller-facing wall at a second position of the second portion that is farther from the center of the rotation shaft than the first position is a second distance that is larger than the first distance. According to Mode 4, stress concentration within the jacket can be further suppressed.

[0031] [Mode 5] According to Mode 5, in any one of Modes 1 to 4, the jacket defines a flow path through which the cooling fluid or the heating fluid flows, serpentine along the wall portion of the pump casing facing the impeller. According to Mode 5, the temperature of the transport liquid in the pump device can be more suitably maintained.

[0032] [Mode 6] According to Mode 6, there is provided a manufacturing method for manufacturing the pump device of any one of Modes 1 to 5, in which the impeller and the pump casing are prepared, and the jacket is manufactured by applying additive manufacturing technology to the pump casing. According to Mode 6, the pump device of Modes 1 to 5 can be easily manufactured.

[0033] [Mode 7] According to Mode 7, there is provided a manufacturing method for manufacturing the pump device of any one of Modes 1 to 5, in which the pump casing and the jacket are integrally manufactured by additive manufacturing technology. According to Mode 7, the pump device of Modes 1 to 5 can be easily manufactured.

[0034] Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. Furthermore, any combination of the embodiments and modifications is possible within the scope of solving at least part of the above-described problems or achieving at least part of the effects, and any combination or omission of the components described in the claims and specification is possible. [Explanation of symbols]

[0035] 10...Pump casing 11...Impeller casing 11A...suction port 11B...Discharge port 12...Seal casing 20...Impeller 20A…Main board 20B...Feather 22...Rotation axis 30...Side panel 40, 40A~40C, 240, 240,...Jacket 41,41C,241…Part 1 42,42C,242…Second part 43...Curved surface 44...Rib part 46...Flow path 60...Pedestal 62...Nozzle 63...Laser 64…Material 71…Material 72…Powder source 74...Forming chamber container 75...Base plate 100,200...Pump equipment 110...wall facing impeller

Claims

1. 1. A pump device comprising: An impeller and a pump casing that houses the impeller, the pump casing having a suction port and a discharge port for a liquid to be conveyed by the impeller, and defining a fluid flow path through which the liquid to be conveyed passes; a jacket formed integrally with the pump casing and containing a cooling fluid or a heating fluid therein, a first portion extending from a side plate of the impeller or an impeller-facing wall portion of the pump casing facing the impeller blades and defining at least a portion of a cylindrical wall surface; a second portion facing the impeller-facing wall portion of the pump casing, The first portion and the second portion are integrally molded with a continuous curved surface. Jacket and A pump device comprising:

2. 2. The pump apparatus according to claim 1, wherein the jacket further includes a rib portion spaced from the first portion and connected to the impeller-facing wall of the pump casing and the second portion.

3. The pump device according to claim 1 , wherein the first portion of the jacket includes a portion whose diameter increases as it moves away from the impeller-facing wall of the pump casing.

4. 2. The pump device according to claim 1, wherein the second portion of the jacket is configured with a curved surface, and a distance between the second portion and the impeller-facing wall portion at a first position of the second portion is a first distance, and a distance between the second portion and the impeller-facing wall portion at a second position of the second portion that is farther from the center of the rotation shaft than the first position of the second portion is a second distance that is larger than the first distance.

5. The pump apparatus according to claim 1 , wherein the jacket defines a flow path through which the cooling fluid or the warming fluid flows, the flow path meandering along the wall of the pump casing facing the impeller.

6. A manufacturing method for manufacturing the pump device according to any one of claims 1 to 5, comprising the steps of: providing the impeller and the pump casing; applying additive manufacturing techniques to the pump casing to manufacture the jacket; A method for manufacturing a pump device, comprising:

7. A manufacturing method for manufacturing the pump device according to any one of claims 1 to 5, comprising the steps of: manufacturing the pump casing and the jacket integrally by additive manufacturing techniques; A method for manufacturing a pump device, comprising:

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