Motor pump bracket and method for manufacturing a motor pump bracket

Abstract

To provide a bracket of a motor pump which can be manufactured by using a lost wax manufacturing method, and a manufacturing method of the bracket of the motor pump.SOLUTION: A bracket 10 comprises a bracket main body 20 and a bearing housing member 60 for holding a bearing 5 which pivots a rotating shaft 4. The bracket main body 20 has a cylindrical main body peripheral wall part 22 and a main body vertical wall part 24 extending from the main body peripheral wall part in a radial direction. The bearing housing member 60 has a cylindrical housing peripheral wall part 62 and a housing vertical wall part 64 extending from the housing peripheral wall part to the inside in the radial direction. The bearing housing member 60 is fit into the main body peripheral wall part 22, and attached to the bracket main body with bolts 23. Then, a space S surrounded by the main body peripheral wall part 22, the main body vertical wall part 24 and the housing vertical wall part 64 is formed in the bracket main body 20 to which the bearing housing member 60 is attached.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a bracket for connecting a motor part and a pump part of a motor pump to each other and a method for manufacturing the bracket.

Background Art

[0002] Conventionally, a bracket for connecting a motor part and a pump part to each other has been used in a motor pump. For example, the motor-integrated pump disclosed in FIG. 1 of Patent Document 1 includes a pump body (10) and a general-purpose motor (24). The pump body (10) has a pump casing (11), a pump bracket (12), and a pump shaft (15). The general-purpose motor (24) has a motor body (not shown), a motor bracket (25), and a motor shaft (27).

[0003] The pump bracket (12) and the motor bracket (25) function as one bracket for connecting the motor part and the pump part to each other by joining their respective flanges (23, 26).

[0004] Further, a bearing housing portion (not numbered) for holding a roller bearing (16) that axially supports the pump shaft (15) is integrally formed on the pump bracket (12).

[0005] By the way, in a conventional motor pump, there is a need to integrally form a pump bracket and a motor bracket into one part. This is because by integrally forming the pump bracket and the motor bracket, the bracket can be shortened in the axial direction and the bracket can be made thinner and lighter. If the bracket is shortened, the overall length of the motor pump in the axial direction is also shortened.

[0006] Furthermore, in many applications of pumps, corrosion resistance and cleanliness are required for the liquids used. In such situations, it is desirable to use stainless steel for the bracket, and it is preferable to use the lost-wax casting method to integrally form a stainless steel bracket. This is because the lost-wax casting method is suitable for forming thin-walled metal products with complex shapes in stainless steel castings.

[0007] The lost-wax casting method, as shown in Patent Document 2, is a method of casting metal products by creating a lost-wax mold through a process that includes a wax model making step (see Figure 1 in Patent Document 2) to create a wax model, an immersion step to apply slurry to the wax model, a sand application step (referred to as the "application step" in Patent Document 2; see Figure 3 in Patent Document 2) to adhere refractory powder to the surface of the slurry-coated wax model, and a firing and dewaxing step to fire the refractory powder and dewax the wax model to which the refractory powder has adhered, and then pouring molten metal into the lost-wax mold. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Utility Model Publication No. 5-17196 [Patent Document 2] Japanese Patent Application Publication No. 8-174145 [Overview of the project] [Problems that the invention aims to solve]

[0009] The inventors of this application have been researching and developing a motor pump bracket 10A in which the pump bracket and the motor bracket are integrally formed, as shown in Figure 7. Compared to the motor pump (motor-integrated pump) bracket disclosed in Patent Document 1, this motor pump bracket 10A eliminates the need to provide a joint portion (flange) between the pump bracket and the motor bracket, thus allowing the bracket to be shortened in the axial direction N.

[0010] The bracket 10A shown in Figure 7 comprises a cylindrical peripheral wall portion 22A extending in the axial direction N, a vertical wall portion 24A extending radially inward from the peripheral wall portion 22A and having a through hole 24Ah through which a rotating shaft can be inserted, and a bearing housing portion 60A formed on the motor side of the vertical wall portion 24A and extending radially inward from the peripheral wall portion 22A to hold a bearing. A through hole 64Ah is formed in the bearing housing portion 60A.

[0011] As shown in Figure 7, a space SA is formed inside the bracket 10A, surrounded by the peripheral wall portion 22A, the vertical wall portion 24A, and the bearing housing portion 60A. In other words, a closed space SA is formed inside the bracket 10A, except for the through holes 24Ah and 64Ah.

[0012] When manufacturing bracket 10A using the lost-wax casting method, it is necessary to introduce refractory powder into the complex and deep space SA of the wax model of bracket 10A and adhere the refractory powder to the wax model (sand coating). However, the through holes 24Ah, 64Ah, and opening 22Ao are narrow, making it difficult to allow sufficient refractory powder to enter the space SA. Even when attempting to sand coating the wax model by sprinkling refractory powder from above, as shown in Figure 3 of Patent Document 2, the refractory powder does not enter the space SA sufficiently, resulting in the formation of a lost-wax mold with insufficient thickness of refractory powder layer around the space SA.

[0013] This invention was conceived in view of the above-mentioned problems, and aims to provide a motor pump bracket that can be manufactured using the lost-wax casting method, and a method for manufacturing a motor pump bracket. [Means for solving the problem]

[0014] A motor pump bracket according to a first aspect of the present invention is a motor pump bracket that connects the motor section and the pump section of the motor pump to each other, and comprises a bracket body and a bearing housing member that holds a bearing that pivotally supports the rotation shaft of the motor pump. The bracket body has a cylindrical body peripheral wall portion extending in the axial direction and a body vertical wall portion extending radially inward from the body peripheral wall portion and having a through hole through which the rotation shaft can be inserted. The bearing housing member has a cylindrical housing peripheral wall portion extending in the axial direction and a housing vertical wall portion extending radially inward from the housing peripheral wall portion and having a through hole through which the rotation shaft can be inserted. The bearing housing member is fitted into the body peripheral wall portion of the bracket body and is attached to the bracket body using bolts. A space is formed inside the bracket body to which the bearing housing member is attached, surrounded by the body peripheral wall portion, the body vertical wall portion and the housing vertical wall portion.

[0015] In a motor pump bracket having the above configuration, a space is formed within the bracket body to which the bearing housing member is attached, enclosed by the main body peripheral wall, the main body vertical wall, and the housing vertical wall. However, since the bearing housing member is separate from the bracket body, when manufacturing the bracket, the bearing housing member and the bracket body can be individually cast using the lost-wax method, and then the bearing housing member can be fitted into the main body peripheral wall of the bracket body and attached to the bracket body using bolts to manufacture the bracket. In other words, in the sand application process performed when manufacturing the bracket using the lost-wax method, the wax model of the bracket body and the wax model of the bearing housing member can be individually sand-applied. Therefore, with a motor pump bracket having the above configuration, it is possible to manufacture the bracket using the lost-wax method without encountering the difficulty of introducing refractory powder into the space in the wax model of the bracket.

[0016] A motor pump bracket according to a second aspect of the present invention is a motor pump bracket according to a first aspect, wherein the vertical wall portion of the main body extends radially inward to the vicinity of the rotation axis, and the vertical wall portion of the housing extends radially inward to the vicinity of the rotation axis.

[0017] A motor pump bracket according to a third aspect of the present invention is a motor pump bracket according to a second aspect, wherein a seal holding portion is formed at the edge of the through hole in the vertical wall of the housing, and a seal member that seals the space between the rotating shaft and the vertical wall of the housing is held in the seal holding portion.

[0018] A motor pump bracket according to a fourth aspect of the present invention is a motor pump bracket according to any of the first to third aspects, wherein a housing flange extending radially outward is formed on the circumferential wall portion of the housing, a flange joining surface to which the housing flange is joined is formed on the circumferential wall portion of the main body, and the bearing housing member is attached to the bracket body using a bolt that passes through the housing flange and the flange joining surface in the axial direction from the motor portion side, with the housing flange in axial surface contact with the flange joining surface.

[0019] The motor pump bracket according to the fifth aspect of the present invention is a bracket according to any of the first to fourth aspects, wherein the bracket body has a discharge port for discharging fluid pumped from the pump section.

[0020] The manufacturing method of the bracket of the motor pump according to the present invention is the manufacturing method of the bracket of the motor pump according to any one of the above first to fifth aspects, including a mold manufacturing step of manufacturing a lost wax mold of the bracket body, a casting step of pouring molten metal into the lost wax mold to cast the bracket body, and an attachment step of attaching the bearing housing member to the cast bracket body using bolts. The mold manufacturing step includes a wax model manufacturing step of manufacturing a wax model of the bracket body, an immersion step of applying a slurry to the wax model, a sanding step of attaching refractory powder to the surface of the wax model to which the slurry has been applied, and a firing and dewaxing step of firing the refractory powder and dewaxing the wax model to which the refractory powder has adhered.

Effect of the Invention

[0021] According to the present invention, it is possible to provide a bracket of a motor pump that can be manufactured using the lost wax method and a manufacturing method of the bracket of the motor pump.

Brief Description of the Drawings

[0022] [Figure 1] It is a cross-sectional view showing a motor pump using the bracket according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view showing the bracket according to an embodiment of the present invention. [Figure 3] It is a cross-sectional view showing the bracket body of the bracket according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view showing the bearing housing member of the bracket according to an embodiment of the present invention. [Figure 5] It is a flowchart showing the steps of the manufacturing method of the bracket according to an embodiment of the present invention. [Figure 6] It is a flowchart showing the mold manufacturing step among the steps of the manufacturing method of the bracket according to an embodiment of the present invention. [Figure 7] It is a cross-sectional view showing the bracket developed by the inventors of the present invention. [Modes for carrying out the invention]

[0023] Hereinafter, a bracket according to an embodiment of the present invention will be described with reference to the drawings. In this specification, directions are defined as follows: the axial direction, radial direction, and circumferential direction are defined with reference to the axis N of the rotating shaft 4 of the motor pump 1. Furthermore, Figures 1 to 4 used in the following description are cross-sectional views along the axis N of the rotating shaft 4, and are cross-sectional views cut to show the characteristic parts of the present invention.

[0024] <Embodiment> As shown in Figure 1, the bracket 10 according to this embodiment connects the motor unit 2 and the pump unit 3 of the motor pump 1 to each other. Note that in Figure 1, only a portion of the motor unit 2 and the pump unit 3 are shown.

[0025] The motor pump 1 includes a rotating shaft 4 that transmits rotational power from the motor unit 2 to the pump unit 3. The rotating shaft 4 is supported by a bearing 5 held in a bracket 10.

[0026] The bearing 5 is attached to the bearing housing member 60, which will be described later, using bearing mounting bolts 6. A washer 7 is placed between the bearing mounting bolts 6 and the bearing housing member 60. The washer 7 functions as a retainer that presses the outer ring of the bearing 5 in the direction of the axis N. In this embodiment, the bearing 5 is a bearing.

[0027] As shown in Figures 1 and 2, the bracket 10 comprises a bracket body 20 and a bearing housing member 60 attached to the bracket body 20.

[0028] As shown in Figures 2 and 3, the bracket body 20 is a substantially cylindrical member that extends in the axial direction N and has vertical walls inside. The bracket body 20 has a motor section connection portion 22c formed at one end in the axial direction N, and a pump section connection portion 28c formed at the other end. This allows the bracket body 20 to connect the motor section 2 and the pump section 3 to each other.

[0029] The bracket body 20 includes a main body peripheral wall portion 22, a main body vertical wall portion 24, a pump section sealing vertical wall portion 26, a pump section sealing peripheral wall portion 28, a sealing vertical wall portion support portion 30, and a discharge pipe 32.

[0030] The main body peripheral wall portion 22 extends in the direction of the axis N, forming a substantially cylindrical shape of the bracket body 20 and surrounding the axis N. The main body peripheral wall portion 22 has a reduced diameter portion 22r where the diameter of the cylindrical shape is reduced when viewed from the motor portion side to the pump portion side.

[0031] A flange joint surface 22i for attaching the bearing housing member 60 is formed in the reduced-diameter portion 22r of the main body peripheral wall portion 22. The flange joint surface 22i is formed such that the motor portion side of the reduced-diameter portion 22r extends radially inward. A bolt hole 22v is formed in the flange joint surface 22i, drilled in the axial direction N from the motor portion side toward the pump portion side. A bolt 23 for attaching the bearing housing member 60 to the bracket body 20 can be screwed into the bolt hole 22v.

[0032] An opening 22o that opens radially is formed in the vicinity of the pump section side end (main body vertical wall section 24) of the main body peripheral wall section 22. The opening 22o is formed between the main body vertical wall section 24 and the bearing housing member 60 attached to the bracket body 20 (specifically, the housing vertical wall section 64 of the bearing housing member 60, which will be described later), and connects the space S, which will be described later, with the outside. Preferably, two openings 22o are formed in the main body peripheral wall section 22 symmetrically with respect to the axis N, but one may be formed.

[0033] The motor-side end of the main body peripheral wall portion 22 is connected to the casing of the motor portion 2. In other words, the motor-side end of the main body peripheral wall portion 22 forms the motor portion connection portion 22c.

[0034] The main body vertical wall portion 24 extends radially inward from the pump-side end of the main body peripheral wall portion 22 to the vicinity of the rotating shaft 4, so as to close the pump-side end of the main body peripheral wall portion 22. A first through-hole 24h is formed in the center of the main body vertical wall portion 24, drilled in the direction of the axis N. The rotating shaft 4 can be inserted through the first through-hole 24h.

[0035] A first seal holding portion 24s is formed near the edge of the first through hole 24h in the main body vertical wall portion 24, protruding toward the motor portion. The first seal holding portion 24s holds a seal member 25 (shown in Figure 1) that seals the space between the rotating shaft 4, which passes through the first through hole 24h, and the main body vertical wall portion 24. In this embodiment, the seal member 25 is an oil seal.

[0036] In the direction of the pump section from the main body vertical wall section 24, pump section sealing vertical wall sections 26 are arranged at intervals. The pump section sealing vertical wall sections 26 seal the motor section side of the pump section 3 to prevent the fluid flowing inside the pump section 3 from flowing out to the motor section side. A pump section sealing peripheral wall section 28 extends from the radial end of the pump section sealing vertical wall section 26 in the direction of the pump section.

[0037] A second through-hole 26h is formed in the center of the pump section sealing vertical wall 26, drilled in the direction of the axis N. The rotating shaft 4 can be inserted through the second through-hole 26h.

[0038] Near the edge of the second through-hole 26h in the pump section sealing vertical wall portion 26, a second seal holding portion 26s is formed, protruding toward the pump section. The second seal holding portion 26s holds a seal member 27 (shown in Figure 1) that seals the space between the rotating shaft 4, which passes through the second through-hole 26h, and the pump section sealing vertical wall portion 26. In this embodiment, the seal member 27 is a mechanical seal.

[0039] An opening 26o is formed in a part of the radial end of the vertical wall portion 26 of the pump section, which serves as an outlet for the fluid pumped from the pump section 3.

[0040] The pump section sealing peripheral wall portion 28 extends in the direction of the axis N, forming a substantially cylindrical shape and surrounding the axis N. The pump section side end of the pump section sealing peripheral wall portion 28 is connected to the casing of the pump section 3. In other words, the pump section side end of the pump section sealing peripheral wall portion 28 forms the pump section connection portion 28c.

[0041] The sealing vertical wall support portion 30 connects a part of the radial end of the main body vertical wall portion 24 and a part of the radial end of the pump portion sealing vertical wall portion 26 to each other in the direction of the axis N, and supports the pump portion sealing vertical wall portion 26 with a gap between it and the main body vertical wall portion 24 in the direction toward the pump portion.

[0042] The discharge pipe 32 is a pipe that forms a flow path for the fluid pumped from the pump section 3. The pump section side end of the discharge pipe 32 is connected to an opening 26o formed in the pump section sealing vertical wall 26. The discharge pipe 32 extends from the pump section side end toward the motor section, curving radially outward so as to penetrate the main body vertical wall 24 and the main body peripheral wall 22, and opening its other end radially outward on the main body peripheral wall 22. That is, one end of the discharge pipe 32 is connected to the discharge port (not shown) of the pump section 3, and the other end of the discharge pipe 32 forms a discharge port 33. As a result, the bracket body 20 has a discharge port 33 for discharging the fluid pumped from the pump section 3.

[0043] The bearing housing member 60 holds the bearing 5 that supports the rotating shaft 4 of the motor pump 1. As shown in Figures 2 and 4, the bearing housing member 60 is a substantially cylindrical member that extends in the axial direction N and has vertical walls inside. As shown in Figure 2, the bearing housing member 60 is fitted into the main body peripheral wall portion 22 of the bracket body 20 and is attached to the bracket body 20 using bolts 23. In this embodiment, the bolts 23 are socket head cap screws.

[0044] The bearing housing member 60 has a housing peripheral wall portion 62 and a housing vertical wall portion 64.

[0045] The housing periphery wall portion 62 extends in the direction of the axis N, forming a substantially cylindrical shape of the bearing housing member 60 and surrounding the axis N. The housing periphery wall portion 62 is provided with a bearing mounting portion 62i for mounting the bearing 5. The bearing mounting portion 62i is formed such that the outer surface of the housing periphery wall portion 62 bulges radially outward. Bolt holes 62v are formed in the bearing mounting portion 62i, drilled in the direction of the axis N from the motor section side toward the pump section side. Bearing mounting bolts 6 for attaching the bearing 5 to the bearing housing member 60 can be screwed into the bolt holes 62v.

[0046] A housing flange 62f extending radially outward is formed on the peripheral wall portion 62 of the housing. Bolt holes 62fv are formed in the housing flange 62f, which are drilled in the axial direction N and through which bolts 23 can be inserted.

[0047] The outer diameter of the housing flange 62f is set to match the inner diameter of the main body peripheral wall portion 22 located on the motor side of the reduced diameter portion 22r of the bracket body 20. This allows the bearing housing member 60 to be press-fitted into the bracket body 20 (main body peripheral wall portion 22) from the opening on the motor side of the bracket body 20, and to overlap the reduced diameter portion 22r in the axial direction N.

[0048] Furthermore, as shown in Figure 2, the housing flange 62f, which overlaps the reduced-diameter portion 22r in the axial direction N, can also overlap the flange joint surface 22i of the bracket body 20 in the axial direction N. Then, with the bolt holes 62fv of the housing flange 62f and the bolt holes 22v of the flange joint surface 22i communicating in the axial direction N, the housing flange 62f is joined to the flange joint surface 22i by screwing the bolts 23 into the bolt holes 62fv and 22v. In other words, with the housing flange 62f in surface contact with the flange joint surface 22i in the axial direction N, the bearing housing member 60 is attached to the bracket body 20 using bolts 23 that are inserted from the motor side through the housing flange 62f and the flange joint surface 22i in the axial direction N.

[0049] The housing vertical wall portion 64 extends radially inward from the pump-side end of the housing peripheral wall portion 62 to the vicinity of the rotating shaft 4, so as to close the pump-side end of the housing peripheral wall portion 62. A housing through-hole 64h is formed in the center of the housing vertical wall portion 64, drilled in the direction of the axis N. The rotating shaft 4 can be inserted through the housing through-hole 64h.

[0050] A housing-side seal retaining portion 64s extending in the axial direction N is formed at the edge of the housing through-hole 64h in the housing vertical wall portion 64. The housing-side seal retaining portion 64s holds a seal member 65 (shown in Figure 1) that seals the space between the rotating shaft 4, which passes through the housing through-hole 64h, and the housing vertical wall portion 64. In this embodiment, the seal member 65 is an oil seal.

[0051] As shown in Figures 1 and 2, a space S is formed inside the bracket 10. Space S is a space formed within the bracket body 20 to which the bearing housing member 60 is attached. That is, when the bearing housing member 60 is attached to the bracket body 20, space S is the space surrounded by the main body peripheral wall portion 22 and the main body vertical wall portion 24 of the bracket body 20 and the housing vertical wall portion 64 of the bearing housing member 60. Space S communicates with the outside only through the opening 22o formed in the main body peripheral wall portion 22, the first through hole 24h formed in the main body vertical wall portion 24, and the housing through hole 64h formed in the housing vertical wall portion 64. For this reason, if the bracket body 20 and the bearing housing member 60 were formed integrally and the bracket 10 were a single component, space S in the wax model of the bracket 10 would be a space where refractory powder would not easily enter from the outside.

[0052] <Manufacturing method> Next, a method for manufacturing the bracket 10 according to the above embodiment will be described. As shown in Figure 5, the method for manufacturing the bracket 10 includes a mold making step ST1 for making lost wax molds for the bracket body 20 and the bearing housing member 60, respectively; a casting step ST2 for casting the bracket body 20 and the bearing housing member 60 by pouring molten metal into the respective lost wax molds; and an attachment step ST3 for attaching the cast bearing housing member 60 to the cast bracket body 20 using bolts 23.

[0053] As shown in Figure 6, the mold making process ST1 includes a wax model making process ST11 for making wax models of the bracket body 20 and the bearing housing member 60, an immersion process ST12 for applying slurry to each wax model, a sand application process ST13 for attaching refractory powder to the surface of each wax model to which slurry has been applied, and a firing and dewaxing process ST14 for firing the refractory powder and dewaxing the wax models to which the refractory powder has been attached. Although the above manufacturing method has been described on the premise that the bracket body 20 and the bearing housing member 60 are each cast by the lost-wax method, it is sufficient that at least the bracket body 20 is cast by the lost-wax method.

[0054] <Effects and Effects> According to the bracket 10 of the motor pump 1 as described above, a space S is formed within the bracket body 20 to which the bearing housing member 60 is attached, surrounded by the main body peripheral wall portion 22, the main body vertical wall portion 24, and the housing vertical wall portion 64. However, since the bearing housing member 60 is separate from the bracket body 20, when manufacturing the bracket 10, the bearing housing member 60 and the bracket body 20 are cast separately using the lost-wax casting method, and then the bearing housing member 60 is fitted into the main body peripheral wall portion 22 inside the bracket body 20 and attached to the bracket body 20 using bolts 23 to manufacture the bracket 10. In other words, in the sand application process performed when manufacturing the bracket 10 using the lost-wax casting method, sand can be applied separately to the wax model of the bracket body 20 and the wax model of the bearing housing member 60. Therefore, with the bracket 10 of the motor pump 1, it is possible to manufacture the bracket using the lost-wax casting method without encountering the difficulty of introducing refractory powder into the space S in the wax model of the bracket 10.

[0055] Furthermore, in the case of the bracket 10, the main body vertical wall portion 24 extends radially inward to the vicinity of the rotation axis 4, and the housing vertical wall portion 64 also extends radially inward to the vicinity of the rotation axis 4. Therefore, the diameters of the first through hole 24h and the housing through hole 64h are only about the size of the diameter of the rotation axis 4. If the bracket 10 were a single unit, it would be difficult to introduce refractory powder into the space S in the wax model of the bracket 10 from the outside. However, since the bracket body 20 and the bearing housing member 60 are separate, such difficulties do not occur, and it can be manufactured using the lost-wax casting method.

[0056] Furthermore, with respect to the bracket 10, a housing-side seal holding portion 64s is formed on the edge of the housing through-hole 64h of the housing vertical wall portion 64. As the seal member 25 is held by the housing-side seal holding portion 64s, the lubricating oil of the bearing 5 is prevented from leaking to the pump portion side from between the rotating shaft 4, which passes through the housing through-hole 64h, and the housing vertical wall portion 64 in the motor pump 1.

[0057] Furthermore, with the bracket 10, the bearing housing member 60 is attached to the bracket body 20 using bolts 23 that are inserted from the motor side through the housing flange 62f and the flange joint surface 22i in the direction of the axis N, with the housing flange 62f of the bearing housing member 60 in surface contact with the flange joint surface 22i of the bracket body 20 in the direction of the axis N. Therefore, when attaching the bearing housing member 60 to the bracket body 20 using bolts 23, the bolts 23 can be easily screwed in without interfering with the peripheral wall portion 22 of the main body or the peripheral wall portion 62 of the housing.

[0058] Furthermore, with bracket 10, since the bracket body 20 has a discharge port 33 for discharging fluid pumped from the pump section 3, the overall length of the motor pump in the axial direction N can be reduced compared to conventional motor pumps where the discharge port is provided on the pump section.

[0059] Furthermore, with the bracket 10, an opening 22o is formed in the main body peripheral wall portion 22 between the main body vertical wall portion 24 and the housing vertical wall portion 64 of the bearing housing member 60 attached to the bracket body 20. Since the opening 22o connects the space S and the outside, the rotating shaft 4 passing through the space S can be cooled, and the transfer of heat from the motor portion 2 to the pump portion 3 through the rotating shaft 4 can be suppressed. In addition, the rotating shaft 4 can be adjusted by inserting a tool such as a wrench through the opening 22o.

[0060] Furthermore, according to the manufacturing method of the bracket 10, the mold making step ST1 includes a wax model making step ST11 for making wax models of the bracket body 20 and the bearing housing member 60, respectively; an immersion step ST12 for applying slurry to each wax model; a sanding step ST13 for attaching refractory powder to the surface of each wax model to which slurry has been applied; and a firing and dewaxing step ST14 for firing the refractory powder and dewaxing the wax models to which the refractory powder has been attached. Therefore, when manufacturing the bracket 10 using the lost-wax method, the bracket 10 can be manufactured by individually casting the bracket body 20 and the bearing housing member 60 without encountering the difficulty of introducing refractory powder into the space S in the wax model of the bracket 10. [Industrial applicability]

[0061] The present invention can be applied, for example, to a bracket for connecting the motor section and the pump section of a motor pump, and to a method for manufacturing the bracket. [Explanation of Symbols]

[0062] 1. Motor pump 2. Motor section 3. Pump section 4 rotation axes 5 bearings 10 brackets 20 Bracket body 22 Main body peripheral wall 22i Flange joint surface 23 volts 24 Main body vertical wall section 24h 1st through hole 33 Discharge Ports 60 Bearing housing component 62 Housing perimeter wall 62f Housing Flange 64 Housing vertical wall section 64h Housing through-hole 64s Housing side seal retaining part 65 sealing member N axis S space

Claims

1. A motor pump bracket that connects the motor section and the pump section of the motor pump to each other, The bracket comprises a bracket body and a bearing housing member that holds a bearing that supports the rotating shaft of the motor pump, The bracket body comprises a cylindrical body periphery wall portion extending in the axial direction and a body vertical wall portion extending radially inward from the body periphery wall portion and having a through hole through which the rotating shaft can be inserted. The bearing housing member comprises a cylindrical housing circumferential wall portion extending in the axial direction and a housing vertical wall portion extending radially inward from the housing circumferential wall portion and having a through hole through which the rotating shaft can be inserted. The bearing housing member is fitted into the peripheral wall portion of the bracket body and is attached to the bracket body using bolts. A motor pump bracket characterized in that a space is formed within the bracket body to which the bearing housing member is attached, enclosed by the peripheral wall of the main body, the vertical wall of the main body, and the vertical wall of the housing.

2. A bracket for a motor pump according to claim 1, The aforementioned vertical wall portion of the main body extends radially inward to the vicinity of the rotation axis, A bracket for a motor pump, characterized in that the vertical wall portion of the housing extends radially inward to the vicinity of the rotation axis.

3. A bracket for a motor pump according to claim 2, A seal retaining portion is formed at the edge of the through hole in the vertical wall portion of the housing. A motor pump bracket characterized in that the seal holding portion holds a sealing member that seals the space between the rotating shaft and the vertical wall portion of the housing.

4. A motor pump bracket according to any one of claims 1 to 3, A housing flange extending radially outward is formed on the peripheral wall portion of the housing. The peripheral wall portion of the main body has a flange joining surface formed thereon, to which the housing flange is joined. A bracket for a motor pump, characterized in that the bearing housing member is attached to the bracket body using a bolt that passes through the housing flange and the flange joint surface in the axial direction from the motor side, while the housing flange is in axial surface contact with the flange joint surface.

5. A motor pump bracket according to any one of claims 1 to 4, The bracket body of the motor pump is characterized by having a discharge port for discharging fluid pumped from the pump section.

6. A method for manufacturing a motor pump bracket according to any one of claims 1 to 5, A mold making process for creating a lost-wax mold for the bracket body, A casting process in which molten metal is poured into the lost-wax mold to cast the bracket body, An installation step of attaching the bearing housing member to the cast bracket body using the bolts, Includes, The mold making process described above is: A wax model making process for making a wax model of the bracket body, The process involves immersion, in which a slurry is applied to the wax model, A sanding step in which refractory powder is attached to the surface of the wax model to which the slurry has been applied, A firing and dewaxing step is performed in which the refractory powder is fired and the wax is removed from the wax model to which the refractory powder is attached. A method for manufacturing a motor pump bracket, characterized by including the following:

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