JP6151294B2 - Centrifugal pump and centrifugal pump manufacturing method - Google Patents

Description

  The present invention relates to a centrifugal pump for circulating a fluid in a closed circuit, such as a refrigerant used in a refrigerant circuit such as an air conditioner and a refrigerator, and cooling water used in a cooling circuit such as a heat-generating part or device. The present invention relates to a method for manufacturing a centrifugal pump. This centrifugal pump is a centrifugal pump that requires pressure resistance and airtightness.

  Conventionally, patent document 1 (Unexamined-Japanese-Patent No. 2003-13878) is disclosed regarding the centrifugal pump for circulating a liquid. In Patent Document 1, the structure of the impeller member is improved so as to form a plurality of flow passage portions extending radially from the center of the impeller member, the change in the cooling water circulation amount is small, and the cooling performance is changed. A centrifugal pump configured to be difficult to occur is disclosed.

  In Patent Document 2 (Japanese Patent Laid-Open No. 2003-161284), an impeller member having a large number of blades formed on the outer periphery and a rotor magnet provided on the inner periphery is provided, and a motor stator is provided on the inner periphery side of the rotor magnet. A thin centrifugal pump capable of realizing efficient cooling by disposing the above is disclosed.

Japanese Patent Laid-Open No. 2003-13878 Japanese Patent Laid-Open No. 2003-161284

  However, such a conventional centrifugal pump does not have a sturdy airtight structure. For example, in order to circulate fluid such as cooling water used in internal combustion engines, refrigerant circulation circuits such as air conditioners and refrigerators, flammable fluids, toxic fluids, etc. in a closed circuit, a centrifugal pump There are problems with pressure resistance and airtightness.

  Moreover, in the structure of the conventional centrifugal pump, the coil part which is a motor stator cannot be attached or detached. For this reason, even if it is going to use a metal case, piping, etc. for use in a centrifugal pump that requires pressure resistance and airtightness, it cannot be fixed by heating such as welding, brazing or welding.

  Furthermore, the bearing of the impeller member is composed of a bearing disposed on one side of the shaft of the impeller member, which is unstable and has problems in durability and silence.

  Further, in the centrifugal pump having such a conventional structure, since the bearing is in the fluid and lubricating oil cannot be used, the shaft member and the impeller member are worn and damaged by the rotation of the impeller member. As a result, it becomes difficult to maintain the desired pump performance.

  Further, such a centrifugal pump has a structure as schematically shown in FIG.

  That is, as shown in FIG. 9, the centrifugal pump 200 includes a metal main body case 204 that houses a rotary blade member (not shown). The main body case 204 includes an upper main body case 206, and the upper main body case 206 includes a top wall 208 and a suction-side side peripheral wall 210 that extends downward from the outer periphery of the top wall 208.

  As shown in FIG. 9, an opening 210 a for fixing a metal suction side joint member (suction side conduit) 212 is formed in the side peripheral wall 210 of the upper body case 206.

  As shown in FIG. 9, a suction side joint member 212 is fixed to the opening 210a in a sealed state by welding, brazing, welding, or the like. Thus, the suction side joint member 212 is configured to communicate with the main body case 204.

  Further, as shown in FIG. 9, a metal discharge side joint member (discharge side) is formed on the side peripheral wall 210 of the upper body case 206 so as to face the opening 210 a for fixing the suction side joint member 212. A discharge-side side peripheral wall 232 in which an opening 210b for fixing the (conduit) 230 is formed is formed.

  As shown in FIG. 9, the discharge-side joint member 230 is fixed to the opening 210b in a sealed state by, for example, welding, brazing, welding, or the like. Thus, the discharge side joint member 230 is configured to communicate with the main body case 204.

  Furthermore, as shown in FIG. 9, the main body case 204 includes a lower main body case (rotor case) 216 and a blade case 222. The outer peripheral flange 224 of the blade case 222 is sandwiched between the lower end 218 of the side peripheral wall 210 of the upper main body case 206 and the outer peripheral flange 220 of the lower main body case 216. For example, welding, brazing, welding, etc. Is fixed in a sealed state. Thus, an internal space S1 surrounded by the upper body case 206 and the lower body case 216 is formed in the body case 204 (see FIG. 12A described later).

  Thereby, the rotating part accommodation space S2 is formed by the blade case 222 and the lower body case 216 (see FIG. 12B described later).

  As a result, as indicated by an arrow C in FIG. 9, the fluid sucked from the suction-side joint member 212 is transferred from the fluid introduction channel 226 formed by the blade case 222 and the upper body case 206 to the rotating portion housing space S2. To be introduced.

  Then, the fluid introduced into the rotating portion accommodating space S2 by the rotational force of the rotating blade member (not shown) is discharged from the rotating portion accommodating space S2 of the main body case 204 as shown by the arrow D in FIG. 230 is discharged.

  As shown in the enlarged view of FIG. 10, during the operation of the centrifugal pump 200, the outer peripheral portion of the rotary blade member becomes the high pressure side by the rotational force of the rotary blade member, and the blade case 222 and the upper body The fluid introduction flow path 226 side formed by the case 206 becomes the low pressure side.

  Therefore, as shown in the enlarged view of FIG. 10, if there is a gap (flow path) between the joint portion 240 of the blade case 222 and the main body case 204, the fluid flows from the rotating portion housing space S <b> 2 on the high pressure side to the fluid. It will flow backward to the introduction flow path 226 side, and the efficiency of the centrifugal pump 200 will fall (refer arrow E of FIG. 10).

  For this reason, it is necessary to maintain the airtightness of the joint 240 of the blade case 222 and the main body case 204 while separating them.

  However, in the centrifugal pump 200 having the structure as shown in FIG. 9, the outer peripheral flange 224 of the blade case 222 is sandwiched between the lower end 218 of the side peripheral wall 210 of the upper main body case 206 and the outer peripheral flange 220 of the lower main body case 216. There is a need to fix in a worn state (need to fix three members at the same time).

  For this reason, if the three members of the blade case 222, the upper body case 206, and the lower body case 216 are overlapped, there is a possibility that a gap is formed, and it is difficult to fix them by welding, brazing, welding, or the like. End up.

  As a countermeasure for this, for example, as shown in FIG. 11, the outer peripheral flange 224 of the blade case 222 is bent so as to form a seal member mounting groove 242, and the seal member mounting groove 242 is It is conceivable to improve the airtightness by installing a sealing member 244 such as an O-ring gasket.

  However, in this case, the seal member 244 may be deteriorated with the passage of time or may be deteriorated by the fluid, and a leak occurs in the seal portion to generate a back flow, so that the efficiency of the centrifugal pump 200 is reduced.

  In addition, when the seal member mounting groove 242 is formed in this way, the manufacturing process is increased due to the complicated structure, and the cost is increased, and the centrifugal pump 200 itself is increased in size.

  In view of such a current situation, the present invention can be fixed by heating such as welding, brazing, and welding, and can use a highly airtight metal case and piping. For example, a refrigerant, a flammable fluid, a toxic fluid, etc. An object of the present invention is to provide a centrifugal pump excellent in pumping performance and a manufacturing method thereof that can be used in a centrifugal pump that is circulated in a closed circuit and requires pressure resistance, airtightness, and corrosion resistance. .

The present invention was invented in order to achieve the problems and objects in the prior art as described above.
It has a metal body case that houses the rotating blade member,
The body case is
An upper body case;
A lower body case fixed to the upper body case;
In order to introduce fluid into the impeller member, a metal suction side joint member provided to communicate with the main body case;
A metal discharge-side joint member provided so as to communicate with the main body case in order to discharge fluid by rotation of the impeller member;
Partitioning an interior space formed by said upper main body case and the lower main body casing, to form a fluid introducing passage above the blade case, forming a rotating housing space for housing the rotating blade member below the blade case And a feather case to
The metal suction side joint member is fixed to the opening of the side peripheral wall of the upper body case,
The metal discharge side joint member is fixed to the side peripheral wall of the upper body case and the opening of the side peripheral wall of the blade case,
An end portion of the blade case is fixed to the upper body case or the lower body case in a sealed state.

In addition, the manufacturing method of the centrifugal pump of the present invention,
It has a metal body case that houses the rotating blade member,
The body case is
An upper body case;
A lower body case fixed to the upper body case;
In order to introduce fluid into the impeller member, a metal suction side joint member provided to communicate with the main body case;
A metal discharge-side joint member provided so as to communicate with the main body case in order to discharge fluid by rotation of the impeller member;
Partitioning an interior space formed by said upper main body case and the lower main body casing, to form a fluid introducing passage above the blade case, forming a rotating housing space for housing the rotating blade member below the blade case A centrifugal pump comprising a blade case,
The metal suction side joint member is fixed to the opening of the side peripheral wall of the upper body case,
The metal discharge side joint member is fixed to the side peripheral wall of the upper body case and the opening of the side peripheral wall of the blade case,
An end portion of the blade case is fixed in a sealed state to the upper body case or the lower body case.

  By configuring in this manner, the end of the blade case is fixed in a sealed state with the upper body case or the lower body case, so between the blade case and the upper body case or with the blade case It is in a sealed state between the lower body case.

  Accordingly, since the two members are fixed to each other, there is little possibility of forming a gap, and there is no need to press-fit and weld, and for example, it is easy to fix by welding, brazing, welding, or the like.

  Moreover, it is not necessary to employ a complicated structure such as mounting a sealing member such as an O-ring / gasket in the sealing member mounting groove, and the sealing member does not deteriorate over time or deteriorate due to fluid. In addition, leakage does not occur in the seal portion and backflow does not occur, and the efficiency of the centrifugal pump does not decrease.

  Further, since it is not necessary to form the seal member mounting groove in this way, a simple structure eliminates the need for many manufacturing processes, and the cost can be reduced and the centrifugal pump itself can be made compact.

  Further, the invention is characterized in that the fixing method in the sealed state is fixing by welding, brazing, or welding.

  As described above, it is easy to employ fixing by welding, brazing, or welding as a fixing method between the blade case and the upper body case or between the blade case and the lower body case. Can be reduced.

  Also, in the case of brazing, when the suction side joint member and the discharge side joint member are brazed to the main body case, brazing can be performed in the same atmosphere, processing can be performed at the same time, and the manufacturing process can be simplified. Cost can be reduced.

  Further, the present invention is characterized in that a flow stop groove for preventing the flow of the fixing material is formed in the vicinity of at least one fixing portion of the upper body case, the blade case, and the lower body case.

  By constituting in this way, for example, a welding rod for welding, a brazing material for brazing, and welding are formed by a flow-preventing groove formed in the vicinity of at least one fixing portion of the upper body case, the blade case, and the lower body case. It is possible to prevent the adhering material such as the welding material from flowing at the time, and it is possible to reduce the extra adhering material without reducing the welding, brazing and welding, and to reduce the cost.

  Furthermore, since the fixing material can be prevented from flowing by the flow-preventing groove, the fixing material can be prevented from solidifying and hindering the flow of the fluid, and the efficiency of the centrifugal pump is not lowered.

  Further, the present invention is characterized in that the flow blocking groove is a flow blocking groove formed by cutting out at least one of the upper body case, the blade case, and the lower body case.

  By configuring in this way, it is only necessary to form the flow-preventing groove by cutting out at least one of the upper body case, the blade case, and the lower body case, so that the processing is easy and the cost can be reduced.

  Further, the present invention is characterized in that the flow blocking groove is a flow blocking groove in which at least one of the upper body case, the blade case, and the lower body case is formed in a groove shape.

  By configuring in this way, it is only necessary to form the flow-preventing groove into a groove shape by bending at least one of the upper body case, the blade case, and the lower body case by, for example, pressing. Processing is easy and the cost can be reduced.

  Further, in the present invention, the flow preventing groove is a flow preventing groove formed by attaching a groove forming member for forming a groove to at least one of the upper body case, the blade case, and the lower body case. It is characterized by.

  By constituting in this way, the groove portion for groove formation can be formed on the upper body case by attaching the groove portion forming member to at least one of the upper body case, the blade case, and the lower body case. The lower body case itself does not need to be processed into a complicated shape, and processing is easy and the cost can be reduced.

  According to the present invention, since the end portion of the blade case is fixed to the upper body case or the lower body case in a sealed state, it is between the blade case and the upper body case or between the blade case and the lower body case. It is in a sealed state with the main body case.

  Accordingly, since the two members are fixed to each other, there is little possibility of forming a gap, and there is no need to press-fit and weld, and for example, it is easy to fix by welding, brazing, welding, or the like.

  In addition, it is not necessary to employ a complicated structure such as mounting a sealing member such as an O-ring or gasket in the sealing member mounting groove, and the sealing member may deteriorate over time or may deteriorate due to fluid. In addition, there is no leakage at the seal portion and no backflow occurs, and the efficiency of the centrifugal pump does not decrease.

  Further, since it is not necessary to form the seal member mounting groove in this way, a simple structure eliminates the need for many manufacturing processes, and the cost can be reduced and the centrifugal pump itself can be made compact.

FIG. 1 is a longitudinal sectional view showing an embodiment of the centrifugal pump of the present invention. FIG. 2 is a partially enlarged cross-sectional view showing another embodiment of the centrifugal pump of the present invention shown in FIG. FIG. 3 is a partially enlarged sectional view showing another embodiment of the centrifugal pump of the present invention shown in FIG. FIG. 4 is a partially enlarged sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention. FIG. 5 is a partially enlarged sectional view of FIG. FIG. 6 is a partially enlarged sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention. FIG. 7 is a partially enlarged cross-sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention. FIG. 8 is a schematic sectional view showing another embodiment of the centrifugal pump of the present invention. FIG. 9 is a schematic cross-sectional view showing the structure of the centrifugal pump. FIG. 10 is a partially enlarged sectional view showing a problem in the structure of the centrifugal pump. FIG. 11 is a partially enlarged sectional view showing a problem in the structure of the centrifugal pump. FIG. 12 is a schematic cross-sectional view for explaining the arrangement of the internal space S1, the fluid introduction channel 84, and the rotating portion accommodating space S2 of the centrifugal pump of the present invention shown in FIG.

Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
Example 1

1 is a longitudinal sectional view showing an embodiment of the centrifugal pump of the present invention, FIG. 2 is a partially enlarged sectional view showing another embodiment of the centrifugal pump of the present invention of FIG. 1, and FIG. 3 is a book of FIG. It is a partial expanded sectional view which shows another Example of the centrifugal pump of invention.
In the present specification, terms indicating the vertical direction such as “upper”, “upper”, “upper”, “lower”, “lower”, “lower” and the like indicate the vertical direction in each drawing. Yes, it indicates the relative positional relationship of each member, and does not indicate an absolute positional relationship.

  1-2, the code | symbol 10 has shown the centrifugal pump of this invention by the whole.

  As shown in FIGS. 1 to 2, the centrifugal pump 10 of the present invention includes a rotary blade member 12. As shown in FIGS. 1 to 2, the rotary blade member 12 includes a plurality of impeller members 16 that extend radially in the outer circumferential direction on the upper part of the cylindrical bearing portion 14.

  The number of impeller members 16 may be selected according to the application of the centrifugal pump 10 and the required pump capacity, and is not particularly limited.

  As shown in FIG. 1, the impeller member 16 includes a base end portion 18 that extends from the bearing portion 14 in the upper outer peripheral direction, and a diameter-enlarged portion 20 that expands upward from the base end portion 18 in the outer peripheral direction. And an outer blade portion 22 extending in the outer peripheral direction from the enlarged diameter portion 20.

  By setting the shape of the impeller member 16 to such a shape, the discharge capability can be improved by the action of the outer blade portion 22 due to the rotation of the impeller member 16.

  Further, the rotary blade member 12 is spaced apart from the outer periphery of the bearing portion 14 by a predetermined interval, and a rotor magnet housing portion 24 is formed on the outer periphery of the base end portion 18. The rotor magnet housing portion 24 includes a flange portion 26 that extends downward from the lower portion of the base end portion 18, and a support portion 28 in which the distal end of the flange portion 26 has an enlarged diameter.

  A fitting hole 32a of a rotor magnet 32 made of an annular permanent magnet is fitted into a mounting portion 30 composed of the flange portion 26 and the support portion 28. As a result, the rotor magnet 32 is prevented from falling off by the expanded support portion 28.

  Moreover, the centrifugal pump 10 of the present invention includes a metal main body case 34 that houses the rotary blade member 12 as shown in FIG. The main body case 34 includes an upper main body case 36, and the upper main body case 36 includes a top wall 38 and a side peripheral wall 40 that extends downward from the outer periphery of the top wall 38.

  As shown in FIGS. 1 and 2, the side peripheral wall 40 of the upper body case 36 is formed with a flange 44 having an opening 40 a for fixing the metal suction side joint member 42. Yes. As shown in FIG. 1, a suction side joint member (suction side conduit) 42 is fixed to the flange 44 in a sealed state by welding, brazing, welding, or the like. Thus, the suction side joint member 42 is configured to communicate with the main body case 34.

  Further, as shown in FIG. 1, a metal discharge side joint member (discharge side) is provided on the side peripheral wall 40 of the upper body case 36 so as to face the opening 40 a for fixing the suction side joint member 42. A flange 50 having an opening 40b for fixing the (conduit) 46 is formed.

  In this case, the positions of the flange 44 and the flange 50 are not limited, and the positions of the flange 44 and the flange 50 can be shifted from each other (for example, by shifting the center angle by 45 degrees), and the shift angle is not particularly limited. The design can be changed according to the application.

  As shown in FIG. 1, a discharge side joint member 46 is fixed to the flange 50 in a sealed state by, for example, welding, brazing, welding, or the like. Accordingly, the discharge side joint member 46 is configured to communicate with the main body case 34.

  As shown in FIGS. 1 and 2, the main body case 34 includes a lower main body case (rotor case) 48. The outer peripheral flange 52 of the lower main body case 48 is fixed to the inner wall of the lower end 51 of the side peripheral wall 40 of the upper main body case 36 in a sealed state, for example, by welding, brazing, welding, or the like. As a result, as shown in FIG. 12A, an internal space S <b> 1 surrounded by the upper body case 36 and the lower body case 48 is formed in the body case 34.

  As shown in FIG. 1, the lower main body case 48 includes a blade accommodating portion 54 that extends substantially horizontally from the outer peripheral flange 52 of the lower main body case 48 to the inner peripheral side, and a lower portion from the blade accommodating portion 54. And an extended rotor magnet housing 56. Furthermore, a bottomed cylindrical lower bearing member accommodating portion 58 is formed below the rotor magnet accommodating portion 56.

  The lower bearing member 60 is fitted into the lower bearing member accommodating portion 58 by, for example, press fitting. The lower end portion 66 of the shaft member 64 is fixed to the shaft hole 62 formed in the lower bearing member 60 so as to be pivotally supported via the thrust washer 61 by, for example, press fitting.

  A shaft member 64 is inserted into the bearing portion 14 of the rotary blade member 12 so that the rotary blade member 12 can rotate.

  Furthermore, as shown in FIGS. 1 and 2, the main body case 34 includes a blade case 68 constituting a partition case joined to the main body case 34 in order to partition the inside of the main body. The blade case 68 has, on the suction side joint member 42 side, an outer peripheral flange (end portion) 70 of the blade case 68 below the flange 44 of the side peripheral wall 40 of the upper body case 36, for example, by welding, brazing, It is fixed in a sealed state by welding or the like.

  2 shows the case of brazing, and the enlarged view of FIG. 3 shows the case of welding. In either case, a configuration including only the fixing portion 70a is shown, and for convenience of explanation, a configuration not including a contact portion 70b described later is shown. Moreover, in the case of FIG. 3, in order to make welding easy, the fixing | fixed part 70a is made into the flange shape.

  With this configuration, the end portion of the blade case 68 (the outer peripheral flange 70 of the blade case 68) is firmly fixed to the upper body case 36 in a sealed state, and therefore, between the blade case 68 and the upper body case 36. In a sealed state.

  Accordingly, since the two members, the blade case 68 and the upper body case 36, are fixed, there is little possibility of forming a gap, and there is no need to press-fit and weld, for example, fixing by welding, brazing, welding, or the like. Is easy.

  Further, as shown in FIG. 11, there is no need to adopt a complicated structure such as mounting a seal member 244 such as an O-ring / gasket in the seal member mounting groove 242, and the seal member 244 deteriorates over time. In addition, the fluid does not deteriorate, the leak does not occur in the seal portion, the backflow does not occur, and the efficiency of the centrifugal pump does not decrease.

  Furthermore, since it is not necessary to form the seal member mounting groove 242 as described above, a simple structure eliminates the need for many manufacturing steps, and the cost can be reduced, and the centrifugal pump itself can be made compact.

  In the case of brazing, when the suction side joint member 42 and the discharge side joint member 46 are brazed to the main body case 34 (upper main body case 36, lower main body case 48), brazing can be performed in the same atmosphere. Thus, it can be processed at the same time, the manufacturing process can be simplified, and the cost can be reduced.

  Further, as shown in FIG. 1, the outer peripheral flange 70 of the blade case 68 includes a fixing portion 70a for fixing to the lower side of the flange 44 of the side peripheral wall 40 of the upper body case 36, and a vertical upward from the fixing portion 70a. The contact part 70b extended so that it may bend in the direction is provided.

  The contact portion 70b is for defining the insertion position of the suction side joint member 42 with respect to the opening 40a for joining the suction side joint member 42 of the side peripheral wall 40 of the upper body case 36 of the main body case 34. Functions as a stopper.

  The contact portion 70b extends to a position where it comes into contact with the tip 42a on the main body case 34 side of the suction side joint member 42. In this case, the contact portion 70b is not extended to the inner diameter portion of the suction side joint member 42, and is configured so that the inflow of fluid from the suction side joint member 42 is not hindered.

  Thereby, the front end 42a of the suction side joint member 42 on the main body case 34 side comes into contact with the contact portion 70b of the outer peripheral flange 70 of the blade case 68, and the suction side joint 40 of the side peripheral wall 40 of the upper main body case 36 becomes closer to the suction side joint. The insertion position of the suction side joint member 42 into the opening 40a is defined.

Therefore, the insertion margin of the suction side joint member 42 into the opening 40a on the suction side joint side of the side peripheral wall 40 of the upper body case 36 is not short, for example, the amount of wrapping of brazing material or the like is not reduced, and the joining area is reduced. Does not decrease. As a result, the suction side joint member 42 is not insufficiently fixed to the flange 44, and the airtight defect does not occur.

  In addition, with this configuration, by inserting the suction side joint member 42 into the opening 40a on the suction side joint side of the side peripheral wall 40 of the upper body case 36, the distance from the side peripheral wall 72 of the blade case 68 becomes small. Thus, as will be described later, the inflow of fluid from the suction side joint member 42 is not hindered.

  On the other hand, in the blade case 68, an opening 72 a is formed in the side peripheral wall 72 of the blade case 68 on the discharge side joint member 46 side, and the periphery of the opening 72 a of the side peripheral wall 72 is the side peripheral wall 40 of the upper body case 36. The flange 50 is fixed together with the discharge side joint member 46 in a sealed state, for example, by welding, brazing, welding, or the like.

  Although not shown, a contact portion extending from the opening 72a of the side peripheral wall 72 of the blade case 68 so as to reduce its inner diameter may be provided on the discharge side joint member 46 side.

  In addition, the number of these contact parts 70b and the arrangement position are not particularly limited. For example, one each may be sufficient. Moreover, you may form over the perimeter in the circumferential direction of the suction side coupling member 42, respectively. Further, the plurality of contact portions 70b may be formed in the circumferential direction so as to be spaced apart from each other by a predetermined interval.

  The blade case 68 includes a side peripheral wall 72 extending upward from the outer peripheral flange 70 and an extending portion 74 extending from the side peripheral wall 72 inward in the horizontal direction along the outer blade portion 22 of the impeller member 16. It has.

  With such a shape, the impeller member 16 can be accommodated between the vane case 68 and the vane accommodating portion 54 of the lower main body case 48.

  The upper bearing member 78 is fixed to the projecting portion 38 a projecting downward from the central portion of the top wall 38 of the upper body case 36, and the inner peripheral side opening 74 a of the extending portion 74 of the blade case 68 is fixed by the fixing holder 71. It is fixed so as to protrude downward.

  Thereby, the upper bearing member 78 is stably supported by the projecting portion 38 a of the top wall 38 of the upper body case 36, and eccentricity and vibration due to the rotation of the rotary blade member 12 can be prevented.

  The upper end portion 82 of the shaft member 64 inserted into the bearing portion 14 of the rotary blade member 12 is inserted into the shaft hole 80 formed in the upper bearing member 78 through the thrust washer 73 by, for example, press fitting. It is fixed to be supported.

  As shown in FIGS. 1 and 2, the diameter of the side peripheral wall 72 of the blade case 68 is smaller than the diameter of the side peripheral wall 40 of the upper body case 36, and The height is smaller than the height of the side peripheral wall 40 of the upper body case 36.

  Accordingly, as shown in FIG. 12B, the blade case 68 divides the internal space S1 formed by the upper body case 36 and the lower body case 48, and the fluid introduction channel 84 is formed above. In addition to being formed, a rotating part accommodating space S2 for accommodating the rotary blade member 12 is formed below.

  Thereby, as shown by the arrow A in FIG. 1, the fluid sucked from the suction side joint member 42 extends from the fluid introduction channel 84 formed by the blade case 68 and the upper body case 36 to the extension of the blade case 68. It passes through the inner peripheral side opening 74a of the installation portion 74. Then, the fluid that has passed through the inner peripheral side opening 74 a is introduced into the rotating portion accommodating space S <b> 2 formed by the blade case 68 and the lower main body case 48.

  Further, as shown in FIG. 1, a metal body case side fixing metal fitting 96 that constitutes a detaching means is provided on the outer periphery of the rotor magnet housing portion 56 of the lower body case 48, for example, by welding, brazing, welding, It is fixed by press fitting.

  As shown in FIG. 1, the main body case side fixing bracket 96 is formed with a locking portion 98 so as to bend and project toward the inner peripheral side.

  As shown in FIG. 1, the centrifugal pump 10 of the present invention is disposed on the outer periphery of the rotor magnet housing portion 56 of the lower body case 48 so as to be positioned around the rotor magnet 32, and the rotary blade member 12. The coil part 104 which rotates is provided. The coil unit 104 includes a plurality of coils 110 formed of windings 108 wound around a bobbin case 106, which are not illustrated on an electronic substrate 112 for performing electronic control, but are spaced apart at regular intervals in the circumferential direction. Is provided.

  These coils 110 are fitted in a coil mounting portion 114a formed inside a substantially cylindrical coil cover main body 114, and the coil 110 together with the electronic substrate 112 is a lid-shaped coil cover. 111 is fixed in the coil cover main body 114.

  Further, as shown in FIG. 1, a housing opening 118 for housing the rotor magnet housing portion 56 and the lower bearing member housing portion 58 of the lower main body case 48 is provided at the center portion of the coil portion 104. Is formed.

  In addition, an accommodation opening 112 a for accommodating the lower bearing member accommodation portion 58 of the rotor magnet accommodation portion 56 of the lower body case 48 is formed in the central portion of the electronic substrate 112.

  On the other hand, an opening 114b is formed in the central portion of the coil cover main body 114, and the rotor magnet accommodating portion 56 and the lower bearing member accommodating portion 58 of the lower main body case 48 are connected via the opening 114b. The housing 104 is configured to be accommodated in the accommodating opening 118 of the coil unit 104 and the accommodating opening 112 a of the electronic substrate 112.

  Furthermore, as shown in FIG. 1, the coil cover main body 114 is provided with a coil side fixed protrusion 116 that constitutes a detaching means. As shown in FIG. 1, the coil-side fixed protrusion 116 is formed with a locking piece 124 that protrudes upward and protrudes outward from the opening 114 b of the coil cover main body 114.

  As a result, the engaging portion 98 of the main body case side fixing metal fitting 96 and the engaging piece 124 of the coil side fixing protrusion 116 are engaged with each other, so that the coil portion 104 is accommodated and closed by the coil cover 111. The coil cover main body 114 is configured to be detachably attached below the main body case 34.

  In FIG. 1, reference numeral 126 denotes a connector, 128 denotes a lead wire, and 130 denotes a magnetic pole sensor for detecting the rotation direction and the rotation position of the rotor magnet 32.

  As described above, according to the centrifugal pump 10 of the present invention, the coil cover main body 114 that houses the coil portion 104 and is closed by the coil cover 111 and the main body case 34 can be freely attached and detached by the attaching / detaching means. In the case of this embodiment, the engaging portion 98 of the main body case side fixing metal fitting 96 and the engaging piece 124 of the coil side fixing protrusion 116 are detachable.

  Therefore, before fixing the coil cover main body 114 containing the coil portion 104 and closed with the coil cover 111 to the main body case 34, the main body case 34 is fixed to the main body case 34 by heating, for example, welding, brazing, welding, Processing requiring heating can be performed, and workability is improved.

  In addition, since the coil cover main body 114 that houses the coil section 104 and is closed by the coil cover 111 and the main body case 34 are detachably fixed by the detachable means, replacement when the coil section 104 fails Can also be easily done. Furthermore, the wiring drawing direction and joint direction (suction side joint member 42 and discharge side joint member 46) can be arbitrarily selected.

  However, such a detaching means is not limited at all, and other detaching means such as screw engagement and uneven engagement can be employed.

  Further, since the shaft member 64 of the rotary blade member 12 is pivotally supported by the upper bearing member 78 and the lower bearing member 60, the bearing of the rotary blade member 12 has a stable structure, and is durable and silent. It is possible to provide the centrifugal pump 10 excellent in the above.

  That is, the rotation of the rotating blade member 12 is stabilized, the noise during rotation is reduced, and the vibration of the rotating blade member 12 is reduced, so that the durability is also improved.

  Further, since the shaft member 64 of the rotary blade member 12 is fixed to the upper bearing member 78 and the lower bearing member 60, and the rotary blade member 12 rotates on the outer periphery of the shaft member 64, the rotary blade member 12 and the shaft member 64 are rotated. The rotational sliding area increases with the outer periphery of the contact surface, and the contact surface pressure also decreases.

  Thereby, rotation of the rotary blade member 12 is stabilized, noise during rotation is reduced, and vibration of the rotary blade member 12 is reduced, so that durability is also improved.

  In this case, the rotating portion between the rotary blade member 12 and the shaft member 64, that is, at least the inner periphery of the bearing portion 14 of the rotary blade member 12 and the outer periphery of the shaft member 64 are made of a synthetic resin having good slidability. It is desirable that

  Accordingly, the bearing 14 of the rotary blade member 12 and the shaft member 64 itself are made of a synthetic resin having good sliding properties, and only the inner periphery of the bearing 14 of the rotary blade 12 and the outer peripheral surface of the shaft member 64 are used. Can be coated with such a slidable synthetic resin.

  In this case, the synthetic resin having good slidability is not particularly limited, and for example, a resin having excellent chemical resistance such as PPS and PTFE can be used.

  By using a synthetic resin with good slidability in this way, the slidability is excellent even under non-lubricated conditions where the bearing is in the fluid, and the shaft member 64 is rotated by the rotation of the rotary blade member 12. The blade member 12 is not damaged by wear, and the durability is improved. Further, the rotating blade member 12 is not rattled or decentered, and the desired pump performance can be maintained.

  In this case, although not shown, the shaft member 64 is fixed to the rotary blade member 12, and the rotary blade member is interposed between the upper bearing member 78 and the shaft member 64 and between the lower bearing member 60 and the shaft member 64. It is also possible to configure so that 12 rotates.

  By comprising in this way, rotation of the rotary blade member 12 is stabilized, the noise at the time of rotation is reduced, and the vibration of the rotary blade member 12 is reduced, thereby improving durability.

  Further, in this case as well, a synthetic resin having good slidability is used between the upper bearing member 78 and the shaft member 64 and between the lower bearing member 60 and the shaft member 64. can do.

  The centrifugal pump 10 of the present invention configured as described above is operated as follows.

  First, a current is passed through the coil 110 of the coil portion 104 to excite the coil 110, thereby acting on the rotor magnet 32 of the rotating blade member 12, and the shaft through which the rotating blade member 12 is inserted into the bearing portion 14. It can be rotated around the member 64.

  As a result, the impeller member 16 of the rotary blade member 12 rotates, and the fluid sucked from the suction side joint member 42 is formed by the blade case 68 and the upper body case 36 as shown by the arrow A in FIG. The fluid introduction flow path 84 passes through the inner peripheral side opening 74 a of the extending portion 74 of the blade case 68.

  Then, the fluid that has passed through the inner peripheral side opening 74 a is introduced into the rotating portion accommodating space S <b> 2 formed by the blade case 68 and the lower main body case 48.

  In addition, the fluid introduced into the rotating part accommodating space S2 by the rotational force of the impeller member 16 of the rotating blade member 12 flows from the rotating part accommodating space S2 of the main body case 34 as shown by the arrow B in FIG. It is discharged via the discharge side joint member 46.

  According to the centrifugal pump 10 of the present invention configured as described above, the main body case 34 includes the upper main body case 36 and the lower main body case (rotor case) 48 fixed to the upper main body case 36. The main body case 48 has a shape including a blade accommodating portion 54 that extends horizontally from the outer periphery of the lower main body case 48 toward the inner peripheral side, and a rotor magnet accommodating portion 56 that extends downward from the blade accommodating portion 54. .

  Accordingly, the impeller member 16 and the impeller member 16 are provided in the internal space S1 formed between the upper main body case 36 and the lower main body case 48 fixed to the upper main body case 36. The rotary blade member 12 composed of the rotor magnet 32 can be accommodated in a compact manner.

  In addition, since the coil unit 104 is disposed so as to be positioned around the rotor magnet 32 and rotates the rotary blade member 12, the coil unit 104 disposed so as to be positioned around the rotor magnet 32 is electromotive. Due to the magnetic path generated by, the rotor magnet 32 provided below the impeller member 16 acts on the rotor magnet housing portion 56 of the lower body case 48.

  As a result, the rotary blade member 12 can be stably rotated. Therefore, an operation loss of the drive motor (the coil portion 104 and the rotor magnet 32) does not occur, and a centrifugal pump excellent in pump performance can be provided.

  Further, the upper main body case 36 and the lower main body case 48 constituting the metal main body case 34 can be fixed by heating such as welding, brazing or welding, and can be fixed in a sealed state.

  That is, it is a structure that enables a joining method having high airtightness such as welding and brazing and holding strength to these connecting portions.

  Therefore, it can be fixed by heating such as welding, brazing, and welding. For example, a coolant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit and its pressure resistance, air tightness, and corrosion resistance are required. A pump can be provided.

  Further, the joint between the upper body case 36 of the metal body case 34 and the blade case 68 can be fixed by heating such as welding, brazing, and welding, and can be fixed in a sealed state.

  Further, the joint between the metal suction side joint member 42 and the main body case 34 and the joint between the discharge side joint member 46 and the main body case 34 can be fixed by heating such as welding, brazing, or welding. Can be fixed in a sealed state.

  That is, it is a structure that enables a joining method having high airtightness such as welding and brazing and holding strength to these connecting portions.

  Therefore, since it can be fixed by heating such as welding, brazing, and welding, a highly airtight metal case and piping can be used.For example, refrigerant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit. A centrifugal pump that requires pressure resistance, airtightness, and corrosion resistance can be provided.

  Further, the internal space S1 formed by the upper main body case 36 and the lower main body case 48 is partitioned, the fluid introduction flow path 84 is formed at the upper side, and the rotary portion storage space S2 for storing the rotary blade member 12 at the lower side is formed. Since the blade case 68 to be formed is provided, a fluid path can be easily formed.

In this case, it is desirable that the main body case 34 is made of a metal press-formed product, and the suction side joint member 42 and the discharge side joint member 46 are made of metal pipes. Thereby, a joining method having high airtightness and holding strength such as welding and brazing can be applied to these connecting portions, and the cost can be reduced.
(Example 2)

  FIG. 4 is a partially enlarged sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention, and FIG. 5 is a partially enlarged sectional view of FIG.

  The centrifugal pump 10 of this embodiment has basically the same configuration as that of the embodiment shown in FIGS. 1 to 3, and the same reference numerals are given to the same components, and the detailed description thereof will be given. Is omitted.

  In the centrifugal pump 10 of this embodiment, as shown in FIGS. 4 and 5, below the flange 44 of the side peripheral wall 40 of the upper body case 36, in the vicinity of the fixing portion 70 a of the outer peripheral flange 70 of the blade case 68, In this embodiment, a flow stop groove 140 for preventing the flow of the fixing material is formed below.

  In the case of this embodiment, the flow blocking groove 140 is constituted by a flow blocking groove 140 having a substantially triangular cross section formed by cutting out the inner wall 41 below the flange 44 of the side peripheral wall 40 of the upper body case 36. Yes.

  The cross-sectional shape of the flow stop groove 140 is not particularly limited as long as the effect of preventing the flow of the fixing material can be expected. For example, various cross-sectional shapes such as a rectangular cross-section and a semicircular shape are available. A flow stop groove 140 may be employed.

  Further, the number of the flow stop groove portions 140 is not limited, and, for example, a plurality of flow stop groove portions 140 can be formed at a predetermined interval. In this case, the depth and shape of the flow stop groove 140 can be changed from each other.

  With this configuration, as shown in FIGS. 4 and 5, the flow is stopped near the outer peripheral flange 70 and the fixing portion 70a of the blade case 68 below the flange 44 of the side peripheral wall 40 of the upper body case 36. A groove portion 140 is formed.

  Therefore, as shown by the arrow F in FIGS. 4 and 5, the anti-flow groove 140 allows a fixing material such as a welding rod in welding, a brazing material in brazing, and a welding material in welding to flow. It can be prevented, welding, brazing, and welding are not hindered, and extra fixing material can be reduced, thereby reducing costs.

  Furthermore, since the fixing material can be prevented from flowing by the flow-preventing groove 140, the fixing material can be prevented from solidifying and obstructing the flow of the fluid, and the efficiency of the centrifugal pump 10 is not lowered.

  Further, since the flow preventing groove 140 only needs to be formed by notching the upper body case 36, processing is easy and the cost can be reduced.

  In this embodiment, the flow preventing groove 140 is formed on the upper body case 36 side. Although not shown, depending on the direction of welding, brazing, and welding, for example, on the blade case 68 side. It is also possible to form the flow stop groove 140 in the vicinity of the fixing portion 70a.

Furthermore, it is also possible to form the flow stop groove 140 in the vicinity of the fixing portion 70a on both the upper body case 36 side and the blade case 68 side.
(Example 3)

  FIG. 6 is a partially enlarged sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention.

  The centrifugal pump 10 of this embodiment has basically the same configuration as that of the embodiment shown in FIGS. 1 to 5, and the same components are denoted by the same reference numerals and detailed description thereof will be given. Is omitted.

  In the centrifugal pump 10 of this embodiment, as shown in FIG. 6, in the vicinity of the fixing portion 70 a of the outer peripheral flange 70 of the blade case 68, downward in this embodiment, a flow stop groove portion that prevents the flow of the fixing material. 142 is formed.

  In the case of this embodiment, the flow stop groove 140 is constituted by a flow stop groove 142 in which the fixing portion 70a of the outer peripheral flange 70 of the blade case 68 is formed in a groove shape.

  In other words, in this embodiment, the fixed portion 70a of the outer peripheral flange 70 of the blade case 68 is configured to extend in the vertical direction and the bent portion 142b that is bent radially outward from the extended portion 142a. A groove 142c is formed by the extended portion 142a and the bent portion 142b.

  With this configuration, as shown by an arrow G in FIG. 6, for example, a fixing material such as a welding rod in welding, a brazing material in brazing, or a welding material in welding is provided by the flow blocking groove 142. Flow can be prevented, welding, brazing, and welding are not hindered, excess fixing materials can be reduced, and costs can be reduced.

  Furthermore, since the fixing material can be prevented from flowing by the flow-preventing groove 142, the fixing material can be prevented from solidifying and obstructing the flow of the fluid, and the efficiency of the centrifugal pump 10 is not lowered.

  Further, by configuring in this way, the extension portion 142a and the bent portion 142b are formed by bending the flow preventing groove portion 142 and the fixing portion 70a of the outer peripheral flange 70 of the blade case 68 by, for example, pressing. Thus, it is only necessary to form the groove 142c and form the groove, so that the processing is easy and the cost can be reduced.

  In this embodiment, the flow-preventing groove 142 is formed on the blade case 68 side. However, although not shown, depending on the orientation during welding, brazing, and welding, for example, on the upper body case 36 side. It is also possible to form a flow-preventing groove 142 in the vicinity of the adhering portion 70a.

Furthermore, it is also possible to form a flow stop groove 142 in the vicinity of the fixing portion 70a on both the upper body case 36 side and the blade case 68 side.
Example 4

  FIG. 7 is a partially enlarged cross-sectional view similar to FIG. 2 showing another embodiment of the centrifugal pump of the present invention.

  The centrifugal pump 10 of this embodiment has basically the same configuration as that of the embodiment shown in FIGS. 1 to 6, and the same components are denoted by the same reference numerals and detailed description thereof will be given. Is omitted.

  In the centrifugal pump 10 of this embodiment, as shown in FIG. 7, in the vicinity of the fixing portion 70 a of the outer peripheral flange 70 of the blade case 68, in this embodiment, in the downward direction, a flow stop groove portion that prevents the flow of the fixing material. 144 is formed.

  In the case of this embodiment, the flow preventing groove 144 is formed by attaching a groove forming member 144 a for forming a groove in the vicinity of the fixing portion 70 a of the outer peripheral flange 70 of the blade case 68.

  That is, the groove forming member 144a includes a fixing portion 144b that is fixed by, for example, welding, brazing, or welding in the vicinity of the fixing portion 70a of the outer peripheral flange 70 of the blade case 68.

  Then, a taper inclined surface 144c inclined so as to expand downward from the fixing portion 144b and a horizontal tip end portion 144d are provided. A groove portion 144e is formed by the tapered inclined surface 144c and the horizontal front end portion 144d.

  With this configuration, as shown by an arrow H in FIG. 7, for example, a fixing member such as a welding rod in welding, a brazing material in brazing, or a welding material in welding is provided by the flow preventing groove 144. Flow can be prevented, welding, brazing, and welding are not hindered, excess fixing materials can be reduced, and costs can be reduced.

  Furthermore, since the fixing material can be prevented from flowing by the flow-preventing groove portion 144, the fixing material can be prevented from solidifying and obstructing the flow of the fluid, and the efficiency of the centrifugal pump 10 is not lowered.

  By configuring in this way, the groove forming member 144a for forming the groove can be formed in the vicinity of the fixing portion 70a of the outer peripheral flange 70 of the blade case 68, so that the flow preventing groove 144 can be formed. There is no need to process into a complicated shape, and processing is easy and cost can be reduced.

  In this embodiment, the flow preventing groove 144 is formed on the blade case 68 side. However, although not shown, for example, depending on the orientation during welding, brazing, and welding, It is also possible to form the flow stop groove 144 in the vicinity of the fixing portion 70a.

Furthermore, it is also possible to form a flow stop groove 144 in the vicinity of the fixing portion 70a on both the upper body case 36 side and the blade case 68 side.
(Example 5)

  FIG. 8 is a schematic sectional view showing another embodiment of the centrifugal pump of the present invention.

  The centrifugal pump 10 of this embodiment has basically the same configuration as that of the embodiment shown in FIGS. 1 to 7, and the same reference numerals are given to the same components, and the detailed description thereof will be given. Is omitted.

  8, only the main body case 34 (the upper main body case 36, the lower main body case 48, the blade case 68), the suction side joint member 42, and the discharge side joint member 46 are shown for convenience of explanation. The members are omitted.

  In the centrifugal pumps of the first to fourth embodiments shown in FIGS. 1 to 7, the blade case 68 has an outer peripheral flange (end portion) 70 of the blade case 68, and the side peripheral wall 40 of the upper body case 36. The flange 44 is fixed in a sealed state by welding, brazing, welding, or the like, for example.

  On the other hand, in the centrifugal pump 10 of this embodiment, as shown in FIG. 8, the outer peripheral flange (end) 70 is, for example, welded, brazed, and welded to the outer peripheral flange 52 of the lower body case 48. For example, it is fixed in a sealed state.

  By configuring in this way, the end of the blade case 68 (the outer peripheral flange 70 of the blade case 68) is fixed in a sealed state with the lower body case 48. Therefore, the blade case 68 and the lower body case 48 Between them.

  Accordingly, since the two members of the blade case 68 and the lower main body case 48 are fixed, there is little possibility of forming a gap, and there is no need for press-fitting and welding, for example, by welding, brazing, welding, etc. Fixing is easy.

  Further, as shown in FIG. 11, there is no need to adopt a complicated structure such as mounting a seal member 244 such as an O-ring / gasket in the seal member mounting groove 242, and the seal member 244 deteriorates over time. In addition, the fluid does not deteriorate, the leak does not occur in the seal portion, the backflow does not occur, and the efficiency of the centrifugal pump does not decrease.

  Furthermore, since it is not necessary to form the seal member mounting groove 242 as described above, a simple structure eliminates the need for many manufacturing steps, and the cost can be reduced, and the centrifugal pump itself can be made compact.

  In the case of brazing, when the suction side joint member 42 and the discharge side joint member 46 are brazed to the main body case 34 (upper main body case 36, lower main body case 48), brazing can be performed in the same atmosphere. Thus, it can be processed at the same time, the manufacturing process can be simplified, and the cost can be reduced.

  Although not shown, also in this embodiment, at least one of the lower main body case 48 and the blade case 68 has a notch-shaped flow-preventing groove portion similar to that in the second embodiment and a groove shape similar to that in the third embodiment. It is also possible to adopt a flow-preventing groove by attaching a flow-preventing groove formed in the above and a groove-forming member for forming a groove similar to that of the fourth embodiment.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this. For example, in the above embodiment, the coil portion 104 is accommodated in the coil cover main body 114 and the coil cover 111 is used. Although the lid is closed, the coil portion 104 may be molded with a mold resin and attached to the lower portion of the main body case 34 in a detachable manner.

  Moreover, in the said Example, although the number of the suction side coupling members 42 and the discharge side joint members 46 was each one, it is also possible to provide two or more numbers of the suction side joint members 42 and the discharge side joint members 46. Various modifications can be made without departing from the scope of the present invention.

  The present invention relates to a centrifugal pump for circulating a fluid in a closed circuit, such as a refrigerant used in a refrigerant circuit such as an air conditioner and a refrigerator, and cooling water used in a cooling circuit such as a heat-generating part or device. The present invention relates to a method for manufacturing a centrifugal pump. This centrifugal pump is a centrifugal pump that requires pressure resistance and airtightness.

DESCRIPTION OF SYMBOLS 10 Centrifugal pump 12 Rotating blade member 14 Bearing part 16 Impeller member 18 Base end part 20 Expanded part 22 Outer blade part 24 Rotor magnet accommodating part 26 Flange part 28 Support part 30 Mounting part 32 Rotor magnet 32a Fitting hole 34 Main body case 36 Upper body case 38 Top wall 38a Projecting portion 40 Side peripheral wall 40a Opening portion 40b Opening portion 41 Inner wall 42 Suction side joint member 42a Tip 44 Flange 46 Discharge side joint member 48 Lower body case 50 Flange 51 Lower end 52 Outer flange 54 Blade Housing portion 56 Rotor magnet housing portion 58 Lower bearing member housing portion 60 Lower bearing member 61 Thrust washer 62 Shaft hole 64 Shaft member 66 Lower end portion 68 Blade case 70 Outer flange 70a Adhering portion 70b Contact portion 71 Fixed holder 72 Side peripheral wall 72a Opening 73 Thrust washer 74 Extension part 74a Inner peripheral side opening part 78 Upper bearing member 80 Shaft hole 82 Upper end part 84 Fluid introduction flow path 96 Body case side fixing metal fitting 98 Locking part 104 Coil part 106 Bobbin case 108 Winding 110 Coil 111 Coil cover 112 Electron Substrate 112a Housing opening 114 Coil cover body 114a Coil mounting portion 114b Opening 116 Coil side fixed projection 118 Housing opening 124 Locking piece 126 Connector 128 Lead wire 130 Magnetic pole sensor 140 Flow blocking groove 142 Flow blocking groove 142a Extension portion 142b Bending portion 142c Groove portion 144 Flow-preventing groove portion 144a Groove portion forming member 144b Adhering portion 144c Taper inclined surface 144d Tip portion 144e Groove portion 200 Centrifugal pump 204 Main body case 206 Upper body case 208 Top wall 210 Side peripheral wall 210a Opening Portion 210b opening 212 suction side joint member 216 lower body case 218 lower end 220 outer flange 222 blade case 224 outer flange 226 fluid introduction flow path 230 discharge side joint member 232 side peripheral wall 240 joint 242 seal member mounting groove 244 seal member A ~ H Arrow S1 Internal space S2 Rotating part accommodating space

Claims (12)

It has a metal body case that houses the rotating blade member,
The body case is
An upper body case;
A lower body case fixed to the upper body case;
In order to introduce fluid into the impeller member, a metal suction side joint member provided to communicate with the main body case;
A metal discharge-side joint member provided so as to communicate with the main body case in order to discharge fluid by rotation of the impeller member;
Partitioning an interior space formed by said upper main body case and the lower main body casing, to form a fluid introducing passage above the blade case, forming a rotating housing space for housing the rotating blade member below the blade case And a feather case to
The metal suction side joint member is fixed to the opening of the side peripheral wall of the upper body case,
The metal discharge side joint member is fixed to the side peripheral wall of the upper body case and the opening of the side peripheral wall of the blade case,
The centrifugal pump, wherein an end of the blade case is fixed in a sealed state to the upper body case or the lower body case.   The centrifugal pump according to claim 1, wherein the fixing method in the sealed state is fixing by welding, brazing, or welding.   The centrifugal pump according to claim 2, wherein a flow-preventing groove for preventing the flow of the fixing material is formed in the vicinity of at least one fixing portion of the upper body case, the blade case, and the lower body case.   The centrifugal pump according to claim 3, wherein the flow stop groove is a flow stop groove formed by cutting out at least one of the upper body case, the blade case, and the lower body case.   5. The centrifugal pump according to claim 3, wherein the flow blocking groove is a flow blocking groove in which at least one of the upper body case, the blade case, and the lower body case is formed in a groove shape. .   The flow stop groove is a flow stop groove formed by attaching a groove forming member for forming a groove to at least one of the upper body case, the blade case, and the lower body case. The centrifugal pump according to any one of 3 to 5. It has a metal body case that houses the rotating blade member,
The body case is
An upper body case;
A lower body case fixed to the upper body case;
In order to introduce fluid into the impeller member, a metal suction side joint member provided to communicate with the main body case;
A metal discharge-side joint member provided so as to communicate with the main body case in order to discharge fluid by rotation of the impeller member;
Partitioning an interior space formed by said upper main body case and the lower main body casing, to form a fluid introducing passage above the blade case, forming a rotating housing space for housing the rotating blade member below the blade case A centrifugal pump comprising a blade case,
The metal suction side joint member is fixed to the opening of the side peripheral wall of the upper body case,
The metal discharge side joint member is fixed to the side peripheral wall of the upper body case and the opening of the side peripheral wall of the blade case,
A method of manufacturing a centrifugal pump, wherein an end portion of the blade case is fixed in a sealed state to an upper body case or a lower body case.   The method for manufacturing a centrifugal pump according to claim 7, wherein the fixing method in the sealed state is fixing by welding, brazing, or welding.   9. The centrifugal pump according to claim 8, wherein a flow stop groove for preventing the flow of the fixing material is formed in the vicinity of at least one of the upper body case, the blade case, and the lower body case. Production method.   The method for producing a centrifugal pump according to claim 9, wherein the flow stop groove is a flow stop groove formed by cutting out at least one of the upper body case, the blade case, and the lower body case.   The centrifugal pump according to claim 9 or 10, wherein the flow stopping groove is a flow blocking groove in which at least one of the upper body case, the blade case, and the lower body case is formed in a groove shape. Manufacturing method.   The flow stop groove is a flow stop groove formed by attaching a groove forming member for forming a groove to at least one of the upper body case, the blade case, and the lower body case. The manufacturing method of the centrifugal pump in any one of 9-11.

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