JP6166301B2 - Centrifugal pump - 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 or a refrigerator, or a cooling water used in a cooling circuit such as a component or device that generates heat. . 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.

  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. It is intended to provide a centrifugal pump that is circulated in a closed circuit and can be used for a centrifugal pump that is required to have pressure resistance, airtightness, and corrosion resistance, and has excellent pump performance.

The present invention was invented in order to achieve the problems and objects in the prior art as described above.
A rotating blade member composed of an impeller member and a rotor magnet provided below the impeller member;
A metal body case that houses the rotating blade member;
A coil portion arranged to be located around the rotor magnet and rotating the rotary blade member;
The body case is
An upper body case;
A lower body case fixed to the upper body case,
The lower body case is
From the outer periphery of the lower main body case, a blade accommodating portion extending horizontally to the inner peripheral side,
A rotor magnet housing portion extending downward from the blade housing portion ;
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;
The internal space formed by the upper body case and the lower body case is partitioned to form a fluid introduction flow path above the blade case and a rotating portion 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,
It is characterized by.

  By configuring in this way, the main body case includes an upper main body case and a lower main body case fixed to the upper main body case, and the lower main body case extends from the outer periphery of the lower main body case to the inner peripheral side. The blade housing portion extends horizontally and the rotor magnet housing portion extends downward from the blade housing portion.

  Accordingly, the space is formed between the upper main body case and the lower main body case fixed to the upper main body case, and is configured by the impeller member and the rotor magnet provided below the impeller member. The rotary blade member can be accommodated in a compact manner.

  In addition, since the coil portion is arranged so as to be located around the rotor magnet and rotates the rotating blade member, the magnetic path generated by generating electricity in the coil portion arranged so as to be located around the rotor magnet By this, the rotor magnet housing portion of the lower body case acts on the rotor magnet provided below the impeller member.

  This makes it possible to rotate the rotating blade member stably. Therefore, it is possible to provide a centrifugal pump excellent in pump performance without causing an operation loss of the drive motor (coil portion and rotor magnet).

  Further, the upper main body case and the lower main body case constituting the metal main body case can be fixed by heating such as welding, brazing, and 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.

The centrifugal pump of the present invention is
The lower body case is composed of a metal press-molded product,
The lower main body case is made of a nonmagnetic metal.

  Thus, since the lower body case is made of a metal press-molded product, the blade housing portion extending horizontally from the outer periphery of the lower body case to the inner circumferential side, and extending downward from the blade housing portion. The lower main body case (rotor case) having a complicated shape including the rotor magnet housing portion can be easily manufactured at high quality and at low cost.

  In addition, since the lower body case is made of a nonmagnetic metal, the magnetic path generated by energizing the coil portion arranged so as to be positioned around the rotor magnet is not hindered, It acts on the rotor magnet provided below the impeller member via the rotor magnet housing portion of the lower magnetic main body case. This makes it possible to rotate the rotating blade member stably.

  Therefore, it is possible to provide a centrifugal pump excellent in pump performance without causing an operation loss of the drive motor (coil portion and rotor magnet).

  In this case, the nonmagnetic metal is not particularly limited, and examples thereof include copper, stainless steel, aluminum, and brass.

  The centrifugal pump according to the present invention is characterized in that the nonmagnetic metal is made of austenitic stainless steel.

  Thus, if the nonmagnetic metal is made of austenitic stainless steel, the upper body case and the lower body case constituting the metal body case are heated, for example, by welding, brazing, welding, or the like. Can be fixed in a sealed state.

  In addition, since it is excellent in drawing workability and mechanical strength if it is an austenitic stainless steel, it extends downward from the outer periphery of the lower body case, the blade accommodating portion that extends horizontally to the inner peripheral side, and the blade accommodating portion. The lower main body case (rotor case) having a complicated shape including the rotor magnet housing portion can be easily manufactured at high quality and at low cost by press working.

  In addition, since austenitic stainless steel is excellent in drawing workability, the thickness of the lower body case can be reduced, so that the coil portion that is arranged around the rotor magnet and rotates the rotating blade member is electromotive. Thus, the magnetic path generated is not obstructed and acts on the rotor magnet provided below the impeller member via the rotor magnet housing portion of the nonmagnetic lower main body case. This makes it possible to rotate the rotating blade member stably.

  Therefore, it is possible to provide a centrifugal pump excellent in pump performance without causing an operation loss of the drive motor (coil portion and rotor magnet).

  In addition, since austenitic stainless steel is excellent in corrosion resistance, for example, a centrifugal pump in which refrigerant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit and its pressure resistance, airtightness, and corrosion resistance are required. Can be provided.

  The centrifugal pump according to the present invention is characterized in that the austenitic stainless steel is composed of austenitic stainless steel having a nickel content of 10.5% or more.

  That is, when producing a lower main body case having a complicated shape including a blade housing portion extending horizontally from the outer periphery of the lower main body case to the inner circumferential side and a rotor magnet housing portion extending downward from the blade housing portion. As described above, it is desirable that the lower body case is made of austenitic stainless steel for easy, high quality and low cost production. Yes.

  However, for example, in a normal austenitic stainless steel such as SUS304 having a Ni content of 8% called 18-8 stainless steel, stress-induced martensite is generated when plastic processing such as drawing is performed. May become martensite and become magnetized.

  For this reason, the magnetic path generated by generating a coil portion that is arranged around the rotor magnet and rotates the rotating blade member is obstructed by the magnetized lower body case. Become.

  As a result, the action on the rotor magnet provided below the impeller member is inhibited via the rotor magnet housing portion of the lower body case.

  Therefore, an operation loss of the drive motor (the coil portion and the rotor magnet) is caused, and the pump performance is also lowered.

  On the other hand, if it is made of austenitic stainless steel having a nickel content of 10.5% or more as in the present invention, stress-induced martensite is generated even if plastic working such as drawing is performed. It is difficult to avoid martensite and become magnetic.

  Thereby, without disturbing the magnetic path generated by the electromotive coil portion arranged to be located around the rotor magnet, through the rotor magnet housing portion of the non-magnetic lower body case, It will act on the rotor magnet provided below the impeller member. This makes it possible to rotate the rotating blade member stably.

  Therefore, it is possible to provide a centrifugal pump excellent in pump performance without causing an operation loss of the drive motor (coil portion and rotor magnet).

  Moreover, the centrifugal pump of the present invention is characterized in that the austenitic stainless steel is composed of austenitic stainless steel having a nickel content of 10.5 to 16%.

  If the nickel content of the austenitic stainless steel is within such a range, stress-induced martensite is hardly generated even when plastic working such as drawing is performed, and it is possible to avoid martensite and become magnetized. .

  Accordingly, it is possible to prevent the action on the rotor magnet provided below the impeller member from being obstructed via the rotor magnet housing portion of the lower body case.

  Therefore, there is no operation loss of the drive motor (coil portion and rotor magnet), and the pump performance is not deteriorated.

  If the nickel content is less than 10.5%, stress-induced martensite is generated when plastic processing is performed, such as drawing, which becomes martensite and becomes magnetized. Conversely, the nickel content This is because if the value exceeds 16%, nickel is expensive and the cost becomes high.

  Such an austenitic stainless steel having a nickel content of 10.5 to 16% is not particularly limited, but depending on the use of the centrifugal pump of the present invention, corrosion resistance, workability, mechanical strength For example, the austenitic stainless steel selected from SUS305, SUS308, SUS309, SUS316, and SUS317 may be used.

  By configuring in this way, the joint portion between the metal main body case (either the upper main body case, the lower main body case, or both) and the blade case is heated, for example, by welding, brazing, or welding. Can be fixed in a sealed state.

  In addition, the joint between the metal suction side joint member and the main body case and the joint between the discharge side joint member and the main body case can be fixed by heating such as welding, brazing, and welding, and in a sealed state. It can be fixed.

  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.

  In addition, the internal space formed by the upper main body case and the lower main body case is partitioned, a fluid introduction flow path is formed above, and a blade case is formed which forms a rotating portion housing space for housing the rotating blade member below. Therefore, the fluid path can be easily formed.

  According to the present invention, the main body case includes an upper main body case and a lower main body case fixed to the upper main body case, and the lower main body case extends horizontally from the outer periphery of the lower main body case to the inner peripheral side. It is the shape provided with the extended blade | wing storage part and the rotor magnet storage part extended below from the blade | wing storage part.

  Accordingly, the space is formed between the upper main body case and the lower main body case fixed to the upper main body case, and is configured by the impeller member and the rotor magnet provided below the impeller member. The rotary blade member can be accommodated in a compact manner.

  In addition, since the coil portion is arranged so as to be located around the rotor magnet and rotates the rotating blade member, the magnetic path generated by generating electricity in the coil portion arranged so as to be located around the rotor magnet By this, the rotor magnet housing portion of the lower body case acts on the rotor magnet provided below the impeller member.

  This makes it possible to rotate the rotating blade member stably. Therefore, it is possible to provide a centrifugal pump excellent in pump performance without causing an operation loss of the drive motor (coil portion and rotor magnet).

  Further, the upper main body case and the lower main body case constituting the metal main body case can be fixed by heating such as welding, brazing, and 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, refrigerant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit, and its pressure resistance, air tightness, and corrosion resistance are required. A centrifugal pump can be provided.

FIG. 1 is a longitudinal sectional view of a centrifugal pump according to the present invention. FIG. 2 is a partially enlarged sectional view of the centrifugal pump of the present invention shown in FIG. FIG. 3 is a schematic cross-sectional view for explaining the arrangement of the internal space S1, the fluid introduction flow path 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 of the centrifugal pump of the present invention, FIG. 2 is a partially enlarged sectional view of the centrifugal pump of the present invention of FIG. 1, and FIG. 3 is an internal space S1 of the centrifugal pump of the present invention of FIG. It is a schematic sectional drawing explaining arrangement | positioning of the introduction flow path 84 and rotation part accommodation space S2.
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.
3, 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. Is omitted.

  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 FIG. 1, the side peripheral wall 40 of the upper body case 36 is formed with a flange 44 in which an opening 40 a for fixing the metal suction side joint member 42 is formed. 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. Thereby, as shown in FIG. 3A, 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 FIG. 1, the main body case 34 includes a blade case 68. The blade case 68 has, on the suction side joint member 42 side, the outer peripheral flange 70 of the blade case 68 is below the flange 44 of the side peripheral wall 40 of the upper body case 36, for example, by welding, brazing, welding, etc. It is fixed in a sealed state.

  Further, the outer peripheral flange 70 of the blade case 68 is fixed so as to be fixed to the lower side of the flange 44 of the side peripheral wall 40 of the upper body case 36, and extends so as to be bent vertically from the fixed portion 70 a. The contact portion 70b is provided.

  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.

  As a result, the tip 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 side peripheral wall 40 of the main body case 34 opens on the suction side joint side. The insertion position of the suction side joint member 42 into the portion 40a is defined.

  Therefore, the insertion position cost of the suction side joint member 42 to the opening 40a on the suction side joint side of the side peripheral wall 40 of the main body case 34 is insufficient, and the strength of the fixation of the suction side joint member 42 to the flange 44 is insufficient. It is configured not to.

  Further, with this configuration, the distance between the suction side joint member 42 and the side peripheral wall 72 of the blade case 68 is reduced 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 main body case 34. Thus, as will be described later, the inflow of fluid from the suction side joint member 42 is not hindered.

  On the other hand, the blade case 68 has an opening 72 a in the side peripheral wall 72 on the discharge side joint member 46 side, and the periphery of the opening 72 a of the side peripheral wall 72 is connected to the flange 50 of the side peripheral wall 40 of the main body case 34. The discharge side joint member 46 is fixed in a sealed state, for example, by welding, brazing, welding, or the like.

  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 FIG. 1, 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 of the side peripheral wall 72 of the blade case 68 is The upper body case 36 is formed to be smaller than the height of the side peripheral wall 40.

  Thus, as shown in FIG. 3B, 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 flow path 84 is formed upward. 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 FIGS. 1 and 2, 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 rotates. A coil portion 104 that rotates the blade member 12 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 accommodates the coil portion 104 and is closed by the coil cover 111 and the main body case 34 are detachable by the detachment 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.

  Furthermore, 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, refrigerant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit, and its pressure resistance, air tightness, and corrosion resistance are required. A centrifugal pump can be provided.

  In addition, the joint between the metal main body case 34 (either the upper main body case 36 or both) and the blade case 68 can be fixed by heating, for example, welding, brazing, welding, etc. It can be fixed.

  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.

  In this case, it is desirable that the lower body case 48 is made of a metal press-molded product and is made of a nonmagnetic metal.

  Since the lower main body case 48 is thus formed of a metal press-molded product, the blade housing portion 54 that extends horizontally from the outer periphery of the lower main body case 48 to the inner peripheral side, and the blade housing portion 54. The lower main body case (rotor case) 48 having a complicated shape including the rotor magnet housing portion 56 extending downward from the head can be easily manufactured at high quality and at low cost.

  Further, since the lower body case 48 is made of a nonmagnetic metal, a magnetic path (an arrow in FIG. 2) generated by generating electricity in the coil portion 104 disposed so as to be positioned around the rotor magnet 32. C)), the rotor magnet 32 provided below the impeller member 16 is acted through the rotor magnet accommodating portion 56 of the nonmagnetic lower main body case 48. As a result, the rotary blade member 12 can be stably rotated.

  Therefore, it is possible to provide the centrifugal pump 10 having excellent pump performance without causing an operation loss of the drive motor (the coil portion 104 and the rotor magnet 32).

  In this case, the nonmagnetic metal is not particularly limited, and examples thereof include copper, stainless steel, aluminum, and brass.

  Moreover, it is desirable that such a nonmagnetic metal is made of austenitic stainless steel.

  Thus, if the nonmagnetic metal is made of austenitic stainless steel, the upper main body case 36 and the lower main body case 48 constituting the metal main body case 34 are welded, brazed, It can be fixed by heating such as welding, and can be fixed in a sealed state.

  Further, since austenitic stainless steel is excellent in drawing workability and mechanical strength, the blade housing portion 54 that extends horizontally from the outer periphery of the lower body case 48 to the inner peripheral side, and the lower portion from the blade housing portion 54 A lower main body case (rotor case) 48 having a complicated shape including a rotor magnet housing portion 56 extending in a straight line can be easily manufactured at high quality and at low cost by pressing.

  Moreover, since the austenitic stainless steel is excellent in drawing workability, the thickness of the lower main body case 48 can be reduced. Therefore, the austenitic stainless steel is disposed so as to be located around the rotor magnet 32 and rotates the rotating blade member 12. The magnetic path (see arrow C in FIG. 2) generated by generating electromotive force 104 is not obstructed, and the impeller member 16 is interposed via the rotor magnet housing portion 56 of the non-magnetic lower body case 48. It acts on the rotor magnet 32 provided below. As a result, the rotary blade member 12 can be stably rotated.

  Therefore, it is possible to provide the centrifugal pump 10 having excellent pump performance without causing an operation loss of the drive motor (the coil portion 104 and the rotor magnet 32).

  Moreover, since austenitic stainless steel is also excellent in corrosion resistance, for example, a centrifugal pump in which refrigerant, flammable fluid, toxic fluid, etc. are circulated in a closed circuit and its pressure resistance, air tightness, and corrosion resistance are required. Can be provided.

  Further, in this case, it is desirable that the austenitic stainless steel is composed of an austenitic stainless steel having a nickel content of 10.5% or more.

  That is, the lower main body case having a complicated shape including a blade housing portion 54 that extends horizontally from the outer periphery of the lower main body case 48 to the inner peripheral side and a rotor magnet housing portion 56 that extends downward from the blade housing portion 54. When the (rotor case) 48 is manufactured, as described above, it is desirable that the lower body case 48 is made of austenitic stainless steel for easy, high quality and low cost manufacturing.

  However, for example, in a normal austenitic stainless steel such as SUS304 having a Ni content of 8% called 18-8 stainless steel, stress-induced martensite is generated when plastic processing such as drawing is performed. May become martensite and become magnetized.

  For this reason, the magnetic path (see arrow C in FIG. 2) that is arranged to be located around the rotor magnet 32 and is generated by generating the coil portion 104 that rotates the rotary blade member 12 is magnetized. It will be obstructed by the lower body case 48.

  As a result, the action on the rotor magnet 32 provided below the impeller member 16 is obstructed via the rotor magnet accommodating portion 56 of the lower body case 48.

  Therefore, an operation loss of the drive motor (the coil unit 104 and the rotor magnet 32) is caused, and the pump performance is also lowered.

  On the other hand, if it is made of austenitic stainless steel having a nickel content of 10.5% or more, stress-induced martensite hardly occurs even when plastic working such as drawing, and martensite is formed. Avoiding magnetism.

  This prevents the magnetic path (see arrow C in FIG. 2) generated by generating the coil portion 104 disposed so as to be located around the rotor magnet 32 from being disturbed, and prevents the non-magnetic lower main body. The rotor magnet accommodating portion 56 of the case 48 acts on the rotor magnet provided below the impeller member 16. As a result, the rotary blade member 12 can be stably rotated.

  Therefore, it is possible to provide the centrifugal pump 10 having excellent pump performance without causing an operation loss of the drive motor (the coil portion 104 and the rotor magnet 32).

  In this case, it is more desirable that the austenitic stainless steel is composed of an austenitic stainless steel having a nickel content of 10.5 to 16%.

  If the nickel content of the austenitic stainless steel is within such a range, stress-induced martensite is hardly generated even when plastic working such as drawing is performed, and it is possible to avoid martensite and become magnetized. .

  Accordingly, it is possible to prevent the action on the rotor magnet 32 provided below the impeller member 16 from being obstructed via the rotor magnet accommodating portion 56 of the lower main body case 48.

  Therefore, the operation loss of the drive motor (the coil unit 104 and the rotor magnet 32) does not occur, and the pump performance does not deteriorate.

  If the nickel content is less than 10.5%, stress-induced martensite is generated when plastic processing is performed, such as drawing, which becomes martensite and becomes magnetized. Conversely, the nickel content This is because if the value exceeds 16%, nickel is expensive and the cost becomes high.

  Such an austenitic stainless steel having a nickel content of 10.5 to 16% is not particularly limited, but depending on the application of the centrifugal pump 10 of the present invention, corrosion resistance, workability, mechanical In consideration of strength and the like, for example, it may be made of austenitic stainless steel selected from SUS305, SUS308, SUS309, SUS316, and SUS317.

  The upper body case 36 does not need to be made of a nonmagnetic metal, and is not a complicated shape like the lower body case 48. Therefore, it is necessary to consider plastic working such as drawing. Therefore, the metal material may be appropriately determined in consideration of corrosion resistance, workability, mechanical strength, and the like according to the use of the centrifugal pump 10 of the present invention.

  Further, the metal suction side joint member 42 and the discharge side joint member 46 do not need to be made of a nonmagnetic metal in particular, and are not complicated in shape as the lower body case 48. Since it is not necessary to consider plastic working as in the case of the above, if the metal material is appropriately determined in consideration of corrosion resistance, workability, mechanical strength, etc. according to the use of the centrifugal pump 10 of the present invention. Good. For example, it can be composed of a conduit made of a copper tube.

  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-described embodiment, the coil portion 104 is accommodated in the coil cover main body 114 and closed with the coil cover 111. However, the coil portion 104 is molded with a mold resin, and is detachable below the main body case 34. It can also be attached to.

  Furthermore, 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, for example, circulates fluid in a closed circuit, such as a refrigerant used in a refrigerant circuit such as an air conditioner or a refrigerator, or a cooling water used in a cooling circuit such as a heat-generating part or device. It can be applied to a centrifugal pump that requires airtightness. 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 42 Suction side joint member 42a Tip 44 Flange 46 Discharge side joint member 48 Lower main body case 50 Flange 51 Lower end 52 Outer flange 54 Blade housing portion 56 Rotor magnet housing part 58 Lower bearing member housing part 60 Lower bearing member 61 Thrust washer 62 Shaft hole 64 Shaft member 66 Lower end part 68 Blade case 70 Outer flange 70a Adhering part 70b Abutting part 71 Fixed holder 72 Side peripheral wall 72a Opening Part 73 Thrust washer 74 Extension part 7 a Inner peripheral side opening 78 Upper bearing member 80 Shaft hole 82 Upper end 84 Fluid introduction flow path 96 Main body case side fixing bracket 98 Locking portion 104 Coil portion 106 Bobbin case 108 Winding 110 Coil 111 Coil cover 112 Electronic substrate 112a Opening 114 coil cover main body 114a coil mounting portion 114b opening 116 coil side fixed protrusion 118 receiving opening 124 locking piece 126 connector 128 lead wire 130 magnetic pole sensor A arrow B arrow C arrow S1 internal space S2 rotating part accommodation space

Claims (6)

A rotating blade member composed of an impeller member and a rotor magnet provided below the impeller member;
A metal body case that houses the rotating blade member;
A coil portion arranged to be located around the rotor magnet and rotating the rotary blade member;
The body case is
An upper body case;
A lower body case fixed to the upper body case,
The lower body case is
From the outer periphery of the lower main body case, a blade accommodating portion extending horizontally to the inner peripheral side,
A rotor magnet housing portion extending downward from the blade housing portion ;
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;
The internal space formed by the upper body case and the lower body case is partitioned to form a fluid introduction flow path above the blade case and a rotating portion 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,
A centrifugal pump characterized by The lower body case is composed of a metal press-molded product,
The centrifugal pump according to claim 1, wherein the lower main body case is made of a nonmagnetic metal.   The centrifugal pump according to claim 2, wherein the nonmagnetic metal is made of austenitic stainless steel.   The centrifugal pump according to claim 3, wherein the austenitic stainless steel is composed of austenitic stainless steel having a nickel content of 10.5% or more.   The centrifugal pump according to claim 4, wherein the austenitic stainless steel is made of austenitic stainless steel having a nickel content of 10.5 to 16%.   The centrifugal pump according to claim 5, wherein the austenitic stainless steel is made of austenitic stainless steel selected from SUS305, SUS308, SUS309, SUS316, and SUS317.

Images