JP2008008196A - Centrifugal pump, method for adjusting characteristics of same and method for manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal pump capable of finely adjusting pump characteristics of the centrifugal pump at low cost. <P>SOLUTION: The centrifugal pump 1 is provided with a case member 10 including a suction port 11 and a delivery port 12, an impeller 20, a cover member 72 constructing a space part together with the case member 10 and storing the impeller 20 in the space part, and a rotor 60 including a shaft 61 rotating the impeller 20. Pump chamber volume regulation members 30, 40 regulating volume of a pump chamber 2 of the centrifugal pump is constructed as a separate member in the space part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a centrifugal pump, a characteristic adjusting method thereof, and a manufacturing method thereof, and more particularly, a centrifugal pump capable of finely adjusting a pump characteristic of a centrifugal pump at low cost, a pump characteristic adjusting method thereof, and a centrifugal pump having different pump characteristics. It is related with the manufacturing method which can manufacture easily.

  FIG. 10 is a partial cross-sectional view showing an example of a general centrifugal pump 100. A centrifugal pump 100 shown in FIG. 10 forms a pump chamber 105 together with a case member 103 having a suction port 101 and a discharge port 102, an impeller 104, and the case member 103, and the impeller 104 is accommodated in the pump chamber 105. A cover member 106 and a rotor 108 having a shaft 107 for rotating the impeller 104 are provided. In such a centrifugal pump 100, the impeller 104 is rotated by a drive motor, velocity energy is given to the liquid by the impeller 104, and the liquid is converted into pressure energy by being decelerated by the case member 103.

Such a pump characteristic of the centrifugal pump 100 is usually represented by a specific speed. The specific speed Ns is a dimensionless number represented by the following equation. In the following formula, N is the number of revolutions (min ⁻¹ ), Q is the flow rate (m ³ / min), and H is the head (m).

Specific speed Ns = N × (Q ^0.5 / H ^0.75 )

  A centrifugal pump refers to a pump having a small specific speed, and is a pump having a high head and a small discharge amount. On the other hand, a pump with a large specific speed is called an axial flow pump and has a low head and a large discharge amount. The middle of the two is called mixed flow pump.

Conventionally, such a centrifugal pump has a problem that the pump efficiency is reduced due to friction loss of the impeller. In order to deal with such problems, for example, in Patent Documents 1 and 2 below, proposals have been made to devise the shape of the liquid passage side section of the impeller.
Japanese Patent Laid-Open No. 2002-122095 JP 2004-278111 A

  The pump characteristics of the centrifugal pump represented by the specific speed are determined by the structure form of the pump chamber and the structure form of the impeller. Therefore, in order to finely adjust the pump characteristics, there is no method other than changing the rotational speed of the drive motor, and the specific speed cannot be changed. Therefore, when a pump with a changed specific speed is required, it is necessary to replace the case member or the impeller. However, replacement of the case member and the impeller requires injection molding using a new mold for forming the new case member and impeller, which is costly and impractical.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a centrifugal pump capable of finely adjusting the pump characteristics of the centrifugal pump at a low cost. Another object of the present invention is to provide a pump characteristic adjusting method capable of finely adjusting a pump characteristic of a centrifugal pump at a low cost. Another object of the present invention is to provide a manufacturing method capable of manufacturing centrifugal pumps having different pump characteristics easily and at low cost.

  A centrifugal pump according to the present invention for solving the above-described problem includes a case member having a suction port and a discharge port, an impeller, and a cover that forms a space portion together with the case member and accommodates the impeller in the space portion. In the centrifugal pump provided with a member and a rotor having a shaft for rotating the impeller, a pump chamber capacity regulating member for regulating the capacity of the pump chamber of the centrifugal pump is configured as a separate member in the space portion. It is characterized by being.

  According to the present invention, since the pump chamber capacity regulating member for regulating the capacity of the pump chamber of the centrifugal pump is disposed as a separate member in the space portion so as to be replaceable, the pump chamber capacity regulating member can be replaced with different specifications. By exchanging it with a new one, it becomes possible to finely adjust pump characteristics such as specific speed. As a result, the pump characteristics can be finely adjusted without changing the rotational speed of the drive motor or without replacing the case member or the impeller.

  In the centrifugal pump of the present invention, it is preferable that other pump chamber capacity regulating members having different cross-sectional areas are provided as exchangeable capacity regulating members having different specifications.

  According to the present invention, the other pump chamber capacity regulating members having different cross-sectional areas are provided as exchangeable capacity regulating members having different specifications, so that the pump characteristics can be finely adjusted by a simple exchange operation.

  In the centrifugal pump of the present invention, the pump chamber capacity regulating member is (1) a ring member whose outer peripheral edge is in contact with the case member and / or the cover member, or (2) the case member and / or the It is preferable that the cover member is composed of a ring member whose outer peripheral edge is in contact with the cover member and a disk-shaped holder that holds the ring member on the rotor side.

  According to the present invention, the pump chamber capacity regulating member is composed of the ring member (1) or the ring member (2) and a disc-shaped holder, and the size and shape of the member are set. By doing so, the capacity of the pump chamber can be adjusted, and as a result, the pump characteristics can be finely adjusted.

  In the centrifugal pump of the present invention, the total thickness of the thickness T1 of the ring member and the thickness T2 of the disk-shaped holder is constant, and exchangeable with different specifications by changing the thicknesses T1 and T2. It is preferable that a capacity regulating member is provided.

  The method for adjusting the pump characteristics of a centrifugal pump according to the present invention for solving the above-described problem includes a case member having a suction port and a discharge port, an impeller, and a space portion together with the case member, and the blade portion in the space portion. A method for adjusting the pump characteristics of a centrifugal pump comprising a cover member for accommodating a car and a rotor having a shaft for rotating the impeller, wherein the capacity of the pump chamber of the centrifugal pump is regulated in the space portion The pump chamber capacity regulating member is configured as a separate member, and another pump capacity regulating member having a different cross-sectional area from the pump chamber capacity regulating member is replaced.

  According to this invention, the pump chamber capacity regulating member that regulates the capacity of the pump chamber of the centrifugal pump is replaceably disposed as a separate member in the space, and the pump chamber capacity regulating member is different in cross-sectional area from the pump chamber capacity regulating member. Since the pump capacity regulating member is replaced, it is possible to finely adjust pump characteristics such as specific speed. As a result, the pump characteristics can be finely adjusted without changing the rotational speed of the drive motor or without replacing the case member or the impeller.

  In order to solve the above problems, a centrifugal pump manufacturing method of the present invention comprises a case member having a suction port and a discharge port, an impeller, and a space portion together with the case member, and the impeller is placed in the space portion. Centrifugal provided with a cover member for housing, a pump chamber capacity regulating member for regulating the capacity of the pump chamber of the centrifugal pump configured as a separate member in the space, and a rotor having a shaft for rotating the impeller In the pump, a method of manufacturing a plurality of centrifugal pumps having different pump characteristics, the step of preparing a plurality of pump chamber capacity regulating members having different cross-sectional areas, and the plurality of centrifugal pumps according to the pump characteristics of the centrifugal pump to be manufactured And a step of assembling using a pump chamber capacity regulating member corresponding to the pump characteristic from among the pump chamber capacity regulating members.

  According to the present invention, a step of preparing a plurality of pump chamber capacity regulating members having different cross-sectional areas and a pump corresponding to the pump characteristics from among the plurality of pump chamber capacity regulating members according to the pump characteristics of the centrifugal pump to be manufactured Assembling using a chamber capacity regulating member, it is possible to assemble various pumps having different pump characteristics easily and at low cost by selecting only a pump chamber capacity regulating member, which is a separate member, from a plurality. .

  According to the centrifugal pump and the pump characteristic adjusting method of the present invention, the pump chamber capacity regulating member arranged so as to be replaced as a separate member is replaced with a replaceable one having different specifications, so that the pump characteristics such as specific speed can be obtained. Therefore, the pump characteristics can be finely adjusted without changing the rotational speed of the drive motor or without changing the case member or the impeller. As a result, it is possible to perform realistic characteristic adjustment that does not cause a large cost increase.

  According to the centrifugal pump manufacturing method of the present invention, only the pump chamber capacity regulating member, which is a separate member, is selected and used according to the specifications (pump characteristics) of the centrifugal pump to be manufactured. Different pumps can be assembled easily and at low cost.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In addition, it cannot be overemphasized that the centrifugal pump of this invention is not limited to the example of the following embodiment in the range which has the technical feature.

  FIG. 1 is an exploded perspective view showing an example of a centrifugal pump according to the present invention, and FIG. 2 is an exploded perspective view of a rotor-side member inserted into a can of the centrifugal pump shown in FIG. FIG. 3 is a cross-sectional view of a centrifugal pump according to the present invention, and FIGS. 4 to 9 are examples of pump chamber capacity regulating members constituting the centrifugal pump of the present invention.

  As shown in FIGS. 1 and 2, the centrifugal pump 1 of the present invention is a pump that introduces a fluid (gas or liquid) from a suction port 11 and discharges it from a discharge port 12. The suction port 11 and the discharge port 12 are connected to each other. A case member 10, an impeller 20, a cover member 72 that forms a space portion with the case member 10 and accommodates the impeller 20 in the space portion, and a rotor 60 having a shaft 61 that rotates the impeller 20. In the centrifugal pump provided with a pump chamber capacity regulating member (30, 40) for regulating the capacity of the pump chamber 2 of the centrifugal pump is disposed in the space portion in a replaceable manner as a separate member. 1 to 3, reference numeral 13 is a screw hole for attaching the case member 10 to the cover member 72 with a screw 80, and reference numeral 50 is between the case member 10 and the cover member 72. Reference numeral 71 denotes a main body case which constitutes the drive unit 70 together with the cover member 72.

  The centrifugal pump 1 of the present invention has a pump chamber capacity regulating member (30, 40) that regulates the capacity of the pump chamber 2 that specifies the pump characteristics of the centrifugal pump in the space formed by the case member 10 and the cover member 72. Since it is characterized by being configured as a separate member, other configurations are not particularly limited, and can take various forms conventionally used. For example, in the configuration of the case member 10, the configuration of the impeller 20, the configuration of the shaft 61 and the rotor 60, the configuration of the drive unit 70, etc. (Japanese Unexamined Patent Publication No. 2004-278711) or other known forms.

  Although it does not specifically limit about the drive part 70, For example, the form shown in FIG. 3 can be illustrated. The drive unit 70 shown in FIG. 3 includes a main body case 71 and a cover member 72, and an insulator (insulator part) 73, a winding part 74, and an insulator (insulator part) from the cover member 72 side that is an inner peripheral side member. ) 75, the core 76, and the main body case 71 are arranged in this order. A relay board 81 and a circuit board 82 are disposed below the rotor 60. Reference numeral 83 denotes a support member that supports the circuit board 82.

  The cover member 72 accommodates the rotor 60 and functions as a so-called can. The bottom surface of the cover member 72 on the rotor 60 side supports the shaft 61 of the rotor 60 and the bearing member 69 of the shaft.

  The rotor 60 includes a shaft 61 that rotates the impeller 20, bearing members 63 and 69, thrust bearings 64 and 68, a yoke 65, and a magnet 66. Pin members 62, 67, 67 passing through the shaft 61 represent a pin member 62 that fixes the shaft 61 and the impeller 20, and pin members 67, 67 that fix the shaft 61 and the yoke 65.

  Next, a specific example of the pump chamber capacity regulating member (30, 40) constituting the centrifugal pump of the present invention having such an embodiment will be described. In the centrifugal pump 1 of the invention, a pump chamber capacity regulating member as shown in FIGS. A plurality of pump chamber capacity regulating members having different cross-sectional areas are provided as exchangeable capacity regulating members having different specifications.

  The pump chamber capacity regulating member shown in FIGS. 4 to 7 is an example constituted by the ring member 30 (30A to 30D) in which the outer peripheral edge 31 contacts the case member 10 and / or the cover member 72. FIGS. The pump chamber capacity regulating member shown in FIG. 9 is composed of a ring member 30 whose outer peripheral edge 31 is in contact with the case member 10 and / or the cover member 72, and a disk-like holder 40 that holds the ring member 30 on the rotor side. It is an example. Each will be described below.

  4A and 4B are a plan view and a cross-sectional view taken along line AA, showing an example of a ring member 30A that is a pump chamber capacity regulating member. The ring member 30A is formed with a constant thickness T1.

  FIG. 5 is a plan view and a BB cross-sectional view showing another example of a ring member 30B that is a pump chamber capacity regulating member. The ring member 30B is formed with a constant thickness T1 as a whole, but on the inner peripheral side of the upper surface disposed on the impeller side, a step portion 32B having a constant depth (Da = Db = Dc). Is formed. The width W of the stepped portion 32B is the smallest width Wa at the position a, the width W gradually increases from the position a toward the position b of 180 °, becomes the width Wb at the position b, and further reaches the position 180 from the position b. The width W gradually increases toward the c position (degree 360 ° from the position a), and is the largest with the width Wc at the position c.

  6A and 6B are a plan view and a C-C cross-sectional view showing another example of the ring member 30C that is a pump chamber capacity regulating member. The ring member 30C is formed with a constant thickness T1 as a whole, but a step portion 32C is formed on the inner peripheral side of the upper surface disposed on the impeller side. The stepped portion 32C shows both the depth D and the width W, the smallest depth Da and the width Wa at the position a, and the depth D and the width W gradually increase from the position a toward the position b of 180 °. , B position becomes the depth Db and the width Wb, and the depth D and the width W further gradually increase toward the c position 180 ° from the b position (360 ° point from the a position). The width Dc and the width Wc are the largest.

  FIG. 7 is a plan view and a DD sectional view showing another example of a ring member 30D which is a pump chamber capacity regulating member. The ring member 30D is formed with a constant thickness T1 as a whole, but a stepped portion 32D having a constant width W (Wa = Wb = Wc) is provided on the inner peripheral side of the upper surface disposed on the impeller side. Is formed. The depth D of the stepped portion 32D indicates the smallest depth Da at the position a, the depth D gradually increases from the position a toward the position b of 180 °, reaches the depth Db at the position b, and The depth D gradually increases from the b position toward the c position of 180 ° (point of 360 ° from the a position), and the depth Dc is the largest at the c position.

  When the ring member shown in FIGS. 5 to 7 is disposed in the pump chamber 2, the position a (c position) of the ring member shown in the figure is on the discharge port 12 side of the case member 10. Be placed. Then, by gradually changing the width W or depth D of the stepped portion from the a position toward the c position, there is an effect that kinetic energy is converted into pressure energy. And if the ring member shown in FIGS. 4-7 is used as a pump chamber capacity | capacitance control member, the specific speed which is one of the pump characteristics can be concretely enlarged or made small.

  8 and 9 are cross-sectional views showing an example of a pump chamber capacity regulating member composed of the ring member 30 and the disc-shaped holder 40. FIG. Comparing FIG. 8 and FIG. 9, both pump chamber capacity regulating members are both composed of the ring member 30 and the disc-shaped holder 40, and are the same in that they are configured to have a constant thickness T as a whole. However, the thickness T1 of the ring member 30 and the thickness T2 of the disk-shaped holder 40 are different. The centrifugal pump provided such that the pump chamber capacity regulating member can be replaced as a separate member can change the capacity of the pump chamber 2 by exchanging the pump chamber capacity regulating member.

  8 and 9, the ratio between the thickness T1 of the ring member 30 and the thickness T2 of the disk-shaped holder 40 is not particularly limited, and can be changed so as to realize desired pump characteristics. 8 and 9, the simple ring member 30A shown in FIG. 4 is used as the ring member, but the ring members (30B, 30C, 30D) shown in FIGS. Etc. are also applicable.

  If the ring member 30 and the disc-shaped holder 40 shown in FIGS. 8 and 9 are used as a pump chamber capacity regulating member, the specific speed, which is one of pump characteristics, is specifically increased or decreased. be able to.

  As described above, according to the centrifugal pump 1 of the present invention, the pump chamber capacity regulating member disposed so as to be replaceable as a separate member is replaced with a replaceable member having different specifications illustrated in FIGS. Thus, the pump characteristics can be finely adjusted, so that the pump characteristics can be finely adjusted without changing the rotational speed of the drive motor or without replacing the case member or the impeller. As a result, it is possible to perform specific speed adjustment (changing the specific speed), which is a realistic characteristic adjustment that does not cause a large cost increase. Such a method can be used as a pump characteristic adjustment method of a centrifugal pump, and fine adjustment of the pump characteristic becomes possible.

  Moreover, since the pump chamber capacity | capacitance control member is comprised as another member in a space part, the centrifugal pump 1 of this invention is especially effective, for example when manufacturing several centrifugal pumps from which a pump characteristic differs. That is, when manufacturing a plurality of centrifugal pumps having different pump characteristics, a step of preparing a plurality of pump chamber capacity regulating members having different cross-sectional areas, and a plurality of pump chamber capacity regulating members according to the pump characteristics of the centrifugal pump to be manufactured The centrifugal pump can be manufactured by the process of assembling using the pump chamber capacity regulating member corresponding to the pump characteristics.

  In such a manufacturing method, it is possible to assemble various centrifugal pumps having different pump characteristic specifications by selecting only a pump chamber capacity regulating member, which is a separate member, from among a plurality of components. Therefore, a centrifugal pump can be manufactured easily and at low cost. . In particular, the present invention can prevent an increase in cost in response to a recent demand from users of a small variety of products, and can have a plurality of pump chamber capacity regulating members as parts inventory according to pump characteristics. There is an advantage to do.

It is a disassembled perspective view which shows an example of the centrifugal pump which concerns on this invention. It is a disassembled perspective view of the member by the side of the rotor inserted in the can of the centrifugal pump shown in FIG. It is sectional drawing of the centrifugal pump which concerns on this invention. It is the top view which shows an example of the ring member which is a pump chamber capacity | capacitance control member, and AA sectional drawing. It is the top view and BB sectional view showing other examples of the ring member which is a pump room capacity regulation member. It is the top view and CC sectional view which show another example of the ring member which is a pump chamber capacity | capacitance control member. It is the top view and DD sectional view which show another example of the ring member which is a pump chamber capacity | capacitance control member. It is sectional drawing which shows an example of the pump chamber capacity | capacitance control member comprised with the ring member and the disk shaped holder. It is sectional drawing which shows another example of the pump chamber capacity | capacitance control member comprised with the ring member and the disk shaped holder. It is a fragmentary sectional view showing an example of a general centrifugal pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Centrifugal pump 2 Pump chamber 10 Case member 11 Suction port 12 Discharge port 13 Screw hole 20 Impeller 30, 30A, 30B, 30C, 30D Ring member 31 Outer peripheral edge 32A, 32B, 32C, 32D Stepped part 40 Disc shaped holder 50 O Ring 60 Rotor 61 Shaft 62, 67 Pin member 63, 69 Bearing member 64, 68 Thrust bearing 65 Yoke 66 Magnet 70 Drive part 71 Body case 72 Cover member 73 Insulator (insulator part)
74 Winding part 75 Insulator (insulator part)
76 Core 80 Screw 81 Relay board 82 Circuit board 83 Support member

Claims (7)

A case member having a suction port and a discharge port; an impeller; a cover member that forms a space with the case member and accommodates the impeller in the space; and a rotor having a shaft that rotates the impeller. In a centrifugal pump with
A centrifugal pump characterized in that a pump chamber capacity regulating member for regulating the capacity of the pump chamber of the centrifugal pump is configured as a separate member in the space portion.   The centrifugal pump according to claim 1, wherein another pump chamber capacity regulating member having a different cross-sectional area is provided as a replaceable capacity regulating member having different specifications.   The centrifugal pump according to claim 1 or 2, wherein the pump chamber capacity regulating member is a ring member whose outer peripheral edge is in contact with the case member and / or the cover member.   The pump chamber capacity regulating member is composed of a ring member whose outer peripheral edge is in contact with the case member and / or the cover member, and a disk-shaped holder that holds the ring member on the rotor side. The centrifugal pump according to claim 1 or 2, characterized by the above.   A total thickness of the ring member thickness T1 and the disc-shaped holder thickness T2 is constant, and includes a replaceable capacity regulating member in which the thicknesses T1 and T2 are changed. The centrifugal pump according to claim 4. A case member having a suction port and a discharge port; an impeller; a cover member that forms a space with the case member and accommodates the impeller in the space; and a rotor having a shaft that rotates the impeller. A method for adjusting the pump characteristics of a centrifugal pump comprising:
A pump chamber capacity regulating member that regulates the capacity of the pump chamber of the centrifugal pump is configured as a separate member in the space, and another pump capacity regulating member having a different cross-sectional area from the pump chamber capacity regulating member is exchanged. A method for adjusting the pump characteristics of a centrifugal pump. A case member having a suction port and a discharge port, an impeller, a cover member that configures a space portion together with the case member and accommodates the impeller in the space portion, and is configured as a separate member in the space portion. This is a method of manufacturing a plurality of centrifugal pumps having different pump characteristics in a centrifugal pump including a pump chamber capacity regulating member for regulating the capacity of the pump chamber of the centrifugal pump and a rotor having a shaft for rotating the impeller. And
A step of preparing a plurality of pump chamber capacity regulating members having different cross-sectional areas and a pump chamber capacity regulating member corresponding to the pump characteristics among the plurality of pump chamber capacity regulating members according to the pump characteristics of the centrifugal pump to be manufactured And a step of assembling using a centrifugal pump.

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