JP2019070339A - Pump casing, pump device, and mold - Google Patents

Abstract

To provide a pump casing, a pump device, and a mold that can be downsized.SOLUTION: A pump casing 23 comprises: a first member 27 constituting a portion of a pump chamber 33 for housing an impeller 22, and to which a casing cover 24 connected to a motor 11 is fixed; and a fastening part 36 comprising a through hole 41 into which a fastening member 25 for fixing the casing cover 24 is inserted, a hollow part 42 arranged in a middle part of the through hole 41, a fastened member 26 arranged in the hollow part 42 and fastened to the fastening member 25, and a thinned part 43 continuous with the through hole 41 and the hollow part 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pump casing molded of a resin material, a pump device using the pump casing, and a mold of the pump casing.

  At present, a pump device is known as a means for pumping a liquid. Such a pump device has a pump in which an impeller is accommodated in a pump casing having a pump chamber, and a motor for rotating the impeller. In the pump device, the impeller is rotated by the motor so that the impeller rotates in the pump chamber, and the liquid sucked into the pump chamber is pressurized and discharged to the secondary side.

  The pump casing used for the pump is, for example, molded of a resin material, and integrally assembled by welding two members divided in the axial direction of the pump casing (see, for example, Patent Document 1). In addition, the pump casing has a volute shape, and includes a fastening portion in which a nut for fixing a casing cover that covers the pump casing is disposed on an outer peripheral surface of a portion having the volute shape. For example, as shown in FIG. 7A, the fastening portion 360 of the motor side member 270 constituting the motor side of the pump casing divided in the axial direction arranges a nut and a bolt screwed with the nut is used. It has a through hole 410 to be inserted, and a meat theft portion 430 provided adjacent to the through hole 410 and separated therefrom.

Patent No. 3661820

  The above-described pump device has the following problems. That is, the pump casing has a configuration in which the fastening portion 360 protrudes from the outer peripheral surface of the volute-shaped portion, and the fastening portion 360 needs to provide the meat theft portion 430 adjacent to the through hole 410. There is a problem that the outer shape of As the outer shape of the pump casing increases, the installation area required for installing the pump device increases. For this reason, it is required to miniaturize the pump casing by reducing the size of the fastening portion.

  As a method of miniaturizing the fastening portion 360, for example, as shown in FIG. 6 and FIG. 7B, a method of bringing the through hole 410 of the fastening portion 360 and the meat stealing portion 430 closer to each other than FIG. Be As a result, the fastening portion 360 can reduce the protrusion from the outer peripheral surface by H1. However, the thickness of the wall between the through hole 410 and the thickness theft portion 430 is as shown in FIG. There is a problem that it becomes thin like H3). Further, in the above-described pump device, as shown in FIG. 7, since the bottom of the meat theft unit 430 is blocked, when water intrudes into the meat theft unit 430, water accumulates inside the meat theft unit 430. There is a problem of

  Therefore, an object of the present invention is to provide a pump casing, a pump device, and a mold which can be miniaturized without water being accumulated in the meat stealing portion 430.

  In order to solve the problems and achieve the object, the pump casing, the pump device and the mold of the present invention are configured as follows.

  As one aspect of the present invention, the pump casing constitutes a part of a pump chamber that accommodates an impeller, and also constitutes a first member to which a casing cover connected to a motor is fixed, and the other part of the pump chamber. A second member to be inserted, a through hole through which a fastening member for fixing the casing cover is inserted, a hollow portion disposed in the middle of the through hole, a fastened member disposed in the hollow portion and fastened with the fastening member; And it has a meat theft part which follows the above-mentioned penetration hole and the above-mentioned hollow part, and has a fastening part provided in the above-mentioned 1st member and the 2nd member.

  As one aspect of the present invention, a pump device has the above-described pump casing.

  In one aspect of the present invention, the mold forms a part of a pump chamber that accommodates an impeller, and an outer surface of a first member to which a casing cover connected to a motor is fixed, and a fastening that fixes the casing cover An upper mold having a part of a through hole through which a member is inserted, and a cavity having a shape of a meat theft part continuing to the part of the through hole; an inner surface of the first member; a part of the through hole; And a lower mold having a cavity in the shape of a hollow portion in which a member to be fastened which is continuous with the light-gathering portion and to be fastened with the fastening member is disposed.

  According to the present invention, it is possible to provide a pump casing, a pump device, and a mold which can be miniaturized without accumulating water in the meat theft portion 430.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the pump apparatus which concerns on one Embodiment of this invention. The top view which shows the structure of the 1st member used for the pump casing of the pump apparatus. The bottom view which shows the structure of the 1st member. Sectional drawing which shows partially the metal mold | die used for shaping | molding of the 1st member. Explanatory drawing shown about the shaping | molding method of the 1st member which used the same metal mold | die. The top view which shows the structure of a part of conventional pump casing. Explanatory drawing which shows the structure of a part of same pump casing.

Hereinafter, a pump device 1 according to an embodiment of the present invention will be described using FIGS. 1 to 5.
FIG. 1 is a cross-sectional view showing a configuration of a pump device 1 according to an embodiment of the present invention, FIG. 2 is a top view showing a configuration of a first member 27 used for a pump casing 23 of the pump device 1, and FIG. 4 is a cross-sectional view partially showing a mold 100 used for molding the first member 27. FIG. 5 is an example of molding of the first member 27 using the mold 100. It is sectional drawing shown about.

  As shown in FIG. 1, the pump device 1 includes a motor 11, a pump 12, and an electrical component 13. The pump device 1 also includes a seal member 14 such as a mechanical seal provided between the motor 11 and the pump 12. Such a pump device 1 is, for example, a so-called underwater sewage pump which is installed in a sewage tank, a sewer or the like, and feeds sewage including foreign matter (such as dirt).

  The motor 11 includes a motor casing 11a, a stator 11b fixed in the motor casing, and a rotor 11c rotated by the stator 11b. The motor 11 is, for example, a permanent magnet motor. One end face of the motor casing 11 a is fixed to the pump 12.

  The pump 12 includes a rotary shaft 21, an impeller 22 fixed to the rotary shaft 21, a pump casing 23 for housing the impeller 22, and a casing cover 24 covering the pump casing 23. The pump 12 also includes a fastening member 25 and a to-be-fastened member 26 that fix the pump casing 23 and the casing cover 24. For example, the fastening member 25 is a hexagonal bolt having a head and a male screw portion, and the fastened member 26 is a hexagonal nut having a female screw portion that can be screwed with the male screw portion of the fastening member 25.

  The rotation shaft 21 is directly or indirectly connected to the rotor 11 c of the motor 11 and is formed so as to be rotatable following the rotation of the rotor. The rotary shaft 21 is rotatably supported by, for example, the motor casing 11 a via a bearing 11 d such as a bearing.

  The impeller 22 is formed, for example, so as to be insertable into the pump casing 23. The impeller 22 is formed so as to be capable of pumping water by rotating in the pump casing 23. The impeller 22 is, for example, a semi-open type impeller in which a plurality of blades are provided on a single disk-like shroud.

  As shown in FIG. 1, the pump casing 23 has a suction port 31 disposed below with the pump device 1 installed on the installation surface, a discharge port 32 formed on a part of the outer peripheral surface, and a suction port 31. And a pump chamber 33 connected to the discharge port 32, and an opening 34 provided at a position facing the motor casing and continuous with the pump chamber 33.

  The pump casing 23 includes a mounting surface 35 which abuts on a casing cover 24 provided around the opening 34, and a fastening portion 36 on which the fastening member 25 and the fastened member 26 for fastening the casing cover 24 are disposed. ing. Moreover, the pump casing 23 is equipped with the some leg part 37 for installing the pump apparatus 1 in the lower surface.

  The pump casing 23 is configured by being integrally assembled by two axially divided members. Specifically, the pump casing 23 is configured by integrally assembling the first member 27 on the motor 11 side and the second member 28 on the installation surface side of the pump device 1 in the axial direction.

  The suction port 31 is disposed by the leg 37 with a predetermined gap from the installation surface of the pump device 1. The discharge port 32 is fluidly connected to, for example, a part of the pump chamber 33 in the radial direction. The discharge port 32 is opened with the axial direction of the open end upward. A pipe is connected to the discharge port 32.

  The pump chamber 33 is formed so as to be able to accommodate the impeller 22. In addition, the pump chamber 33 has an inner circumferential surface capable of forming a volute-shaped flow passage capable of guiding the liquid pressurized by the impeller 22 to the discharge port 32. The portion to be the largest diameter of the pump chamber 33 is formed larger in diameter than the inner diameter of the opening 34. In other words, the inner shape of the pump chamber 33 is formed in a so-called undercut shape in which the diameter is larger than that of the opening 34.

  The opening 34 has an inner diameter that allows the impeller 22 to be inserted into the pump chamber 33. The mounting surface 35 is formed to be able to abut on the end face of the casing cover 24.

  The fastening portion 36 is provided so as to protrude from the outer peripheral surface of a portion constituting the volute-shaped pump chamber 33 of the pump casing 23. The fastening portion 36 has a through hole 41 extending along the axial direction, a hollow portion 42 having at least two opposing surfaces provided at a middle portion of the through hole 41, and a portion of the hollow portion 42 and the through hole 41. And a to-be-fastened member 26 disposed in the hollow portion 42. As shown in FIG. In other words, in the fastening portion 36, the fastened member 26 is disposed in the hollow portion 42.

  The through hole 41 is larger in diameter than the male screw portion of the fastening member 25 and has an inner diameter smaller than the circumscribed circle of the head of the fastening member 25. The hollow portion 42 has a pair of opposing flat surfaces facing at least two opposing surfaces of the outer surface of the member 26 to be fastened, and constitutes a space in which the member 26 to be fastened can be disposed. The hollow portion 42 is provided inside the fastening portion 36. For example, the hollow portion 42 is a substantially columnar space having a hexagonal column shape or a pair of opposing flat surfaces.

  The meat theft portion 43 is provided in the range from the upper surface of the fastening portion 36 to the hollow portion 42 of the through hole 41 and is continuous with a portion of the inner peripheral surface of the through hole 41 and a portion of the upper end of the hollow portion 42 It is a hollow provided. A space formed by the meat theft portion 43 is continuous with the through hole 41 and the hollow portion 42. As shown in FIGS. 1 and 2, the meat theft portion 43 is provided in the fastening portion 36 between the through hole 41 and the pump chamber 33 and constitutes a recess having a shape conforming to the outer shape of the fastening portion 36. Also, the meat stealing section 43 has a rib 43a passing through the center thereof.

  A plurality of leg portions 37 are arranged at equal intervals around the suction port 31. The leg portion 37 is configured such that the suction port 31 can be disposed at a predetermined height from the installation surface of the pump device 1 in a state where the pump device 1 is installed on the installation surface.

  The first member 27 is formed by injection molding using a resin material. The first member 27 is formed in a shape that constitutes a part of the discharge port 32, a part of the pump chamber 33, the opening 34, the attachment surface 35, and a part of the fastening part 36. The end face of the first member 27 opposite to the second member 28 is configured to be flat, or has an annularly continuous projection at a position surrounding a part of the discharge port 32 and a part of the pump chamber 33 .

  A part of the discharge port 32 provided in the first member 27 forms an opening connected to the pipe. A part of the pump chamber 33 provided in the first member 27 is shaped so as not to generate an undercut portion so as to be capable of being released. A portion of the fastening portion 36 provided in the first member 27 is provided at the first hole portion 41 a which is a portion of the through hole 41 and at the end of the first hole portion 41 a, and can accommodate the fastened member 26. And a recess 42 a having a shape in which one end of the hollow portion 42 is open. The recess 42 a opens at the end face of the first member 27. The recess 42 a is formed in a shape that can restrict rotation of the inserted fastening member 26 in the axial direction.

  The second member 28 is formed in a shape that constitutes the suction port 31, the other portion of the discharge port 32, the other portion of the pump chamber 33, the other portion of the fastening portion 36, and the leg portion 37. The end face of the second member 28 facing the first member 27 is, for example, a flat surface. When an annular continuous projection is provided on the end face of the first member 27, the end face of the second member 28 facing the first member 27 is a continuous annular groove engaged with the projection. Have. The groove may be provided on the end face of the first member 27 and the protrusion may be provided on the end face of the second member.

  The other part of the discharge port 32 provided in the second member 28 forms a part of the flow path from the pump chamber 33 to the opening of the discharge port 32. The other part of the pump chamber 33 provided in the second member 28 has a shape that does not cause an undercut portion so that mold release is possible. That is, in the inner surface shape of the pump chamber 33, the first member 27 and the second member 28 have two pump casings 23 in the portion where the distance from the center is the largest, in other words, the portion having the maximum inner diameter of the pump chamber 33. It is formed in the shape divided into

  The other part of the fastening part 36 provided in the second member 28 has a second hole 41 b which is the other part of the through hole 41. The end face of the second hole 41b constituting the other part of the fastening portion 36 of the second member 28 covers the recess 42a and is configured to be able to support the to-be-fastened member 26 disposed in the recess 42a. The second hole 41 b constitutes the through hole 41 of the fastening portion 36 together with the first hole 41 a of the first member 27.

  The first member 27 and the second member 28 constitute an integral pump casing 23 by welding the end surfaces in a state where the end surfaces facing each other are in contact with each other.

  The casing cover 24 is connected to the pump casing 23 and covers the opening 34 of the pump casing 23. The casing cover 24 is connected to the motor casing 11a. The casing cover 24 constitutes a seal chamber 14a together with the motor casing 11a.

  The seal member 14 is provided between the motor casing 11 a and the casing cover 24, and is configured to be able to seal between the rotation shaft 21 and the casing cover 24. The seal member 14 is a mechanical seal. The seal member 14 is accommodated in a seal chamber 14 a constituted by the motor casing 11 a and the casing cover 24. The seal chamber 14a is filled with, for example, a lubricant.

Next, a mold 100 for molding the first member 27 of the pump casing 23 will be described.
The mold 100 is a split mold and includes an upper mold 101 and a lower mold 102 which are divided into two along the axis of the pump chamber 33. For example, one of the upper mold 101 and the lower mold 102 is a fixed mold, and the other constitutes a movable mold.

  The upper mold 101 has, for example, the outer surface of the first member 27, the shape of the inner peripheral surface of the opening 34, and the cavity 110 configured in the inner surface shape of the first hole 41a and the light theft portion 43. The end face of the mold 101 on the side of the cavity 101a is formed flat. The first portion 111 formed in the shape of the inner surface of the first hole portion 41 a of the cavity 110 and the meat theft portion 43 is formed in a projecting shape.

  The lower mold 102 has, for example, a cavity 120 configured in the inner surface shape of the first member 27 excluding the shapes of the inner peripheral surface of the opening 34 and the inner surfaces of the first hole 41a and the light theft portion 43. The end face of the mold 102 on the side of the cavity 120 is configured to be flat. The second portion 121 formed in the inner surface shape of the recess 42 a of the cavity 120 is formed in a projecting shape, and the end surface of the first portion 111 of the upper mold 101 abuts on the end surface of the second portion 121. A space of the shape of the fastening portion 36 including the hollow portion 42 and the meat theft portion 43 is configured.

Next, a method of manufacturing such a pump casing 23 will be described.
First, using the mold 100 of the first member 27 and the mold of the second member 28, the first member 27 and the second member 28 are molded by resin molding, for example, injection molding. Subsequently, the to-be-fastened member 26 is inserted into the recessed portion 42 a of the molded first member 27. Next, the end surface of the first member 27 and the end surface of the second member 28 are welded in a state where the end surface of the first member 27 and the end surface of the second member 28 are in contact with each other. For example, welding of the end face is performed by vibration welding or ultrasonic welding.

  Thus, the pump casing 23 having the fastening portion 36 in which the first member 27 and the second member 28 are integrally fixed and the to-be-fastened member 26 is disposed in the hollow portion 42 is manufactured.

  First, the casing cover 24 is fixed to the motor 11 in which the rotary shaft 21 is fixed to the rotor 11 c, the impeller 22 is fixed to the rotary shaft 21, and the casing cover 24 is fixed. Assemble integrally with the pump casing 23. Thereafter, the fastening member 25 is inserted into the through hole 41 of the fastening portion 36 and screwed to the fastened member 26 of the hollow portion 42. The pump device 1 is manufactured by these steps.

  According to the pump device 1 configured as described above, unlike the conventional pump casing shown in FIGS. 6 and 7, the fastening portion 36 of the pump casing 23 is continuous with a part of the through hole 41 and the meat theft portion 43 Is provided. As described above, since the through hole 41 and the meat theft portion 43 are continuous by providing the through hole 41 and the the meat theft portion 43 integrally, a member is disposed between the through hole 41 and the meat theft portion 43 It does not need to be done.

  Therefore, the length of the fastening portion 36 projecting from a predetermined portion of the pump casing 23, in other words, the length from the outer peripheral surface of the portion where the pump chamber 33 of the pump casing 23 is formed to the tip of the fastening portion 36 is short. You may As a result, the fastening portion 36 can be made smaller, and the pump casing 23 can be made smaller. Further, the resin material required for molding the pump casing 23 can be reduced, the material cost can be reduced, and the manufacturing cost of the pump device 1 can be reduced.

  In addition, the fastening portion 36 has a configuration in which the meat theft portion 43 is recessed from the upper surface side and is configured to be continuous with a portion of the through hole 41 and a portion of the hollow portion 42. Even in this case, drainage can be performed through the through hole 41 and the hollow portion 42.

  In addition, the fastening portion 36 has a configuration in which the meat theft portion 43 is continuous with a portion of the inner peripheral surface of the through hole 41 and a portion of the upper end surface of the hollow portion 42. Therefore, in the mold 100 for molding the pump casing 23, the first portion 111 of the upper mold 101 and the second portion 121 of the lower mold 102 are in the axial center direction of the through hole 41, in other words, the upper mold 101 and It abuts on each end face orthogonal to the moving direction of the lower mold 102. As a result, the first portion 111 of the upper mold 101 and the second portion 121 of the lower mold 102 contact each other only when the end faces abut each other at the time of mold clamping, without rubbing and when the pump casing 23 is repeatedly formed Can be prevented as much as possible. Thereby, generation of burrs and the like can be prevented, and the first member 27 which is a stable molded product can be provided.

  The pump casing 23 has a configuration in which the first member 27 and the second member 28 are assembled and welded together after the to-be-fastened member 26 is disposed in the recess 42 a. With this configuration, it is not necessary to insert the to-be-fastened member 26 into a resin molded product at the time of resin molding of the pump casing 23.

  For this reason, the process of arranging the to-be-fastened member 26 in the mold is not necessary, and the molten resin material does not enter the to-be-fastened member 26. Moreover, as long as it is the to-be-fastened member 26 which can be inserted in the recessed part 42a and rotation is regulated by inserting, the structure of the to-be-fastened member 26 is not limited. When a bolt is used as the fastening member 25 as described above, an inexpensive nut can be used as the fastened member 26.

  As a result, the manufacturing process of the pump casing 23 and the material cost of the fastened member 26 can be reduced, and the fastening member 25 and the fastened member 26 can be reliably screwed together.

  As described above, according to the pump casing 23 used in the pump device 1 according to the present embodiment, the meat theft portion 43 of the fastening portion 36 used for the pump casing 23 is made continuous with the through hole 41. The height projecting from the pump casing 23 is reduced, and the pump casing 23 can be miniaturized.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the configuration in which a nut is used for the fastened member 26 has been described, but the present invention is not limited to this. The fastened member 26 can be appropriately set as long as it can be fastened with the fastening member 25. For example, the to-be-fastened member 26 may be configured to use a cap nut instead of a nut.

  Similarly, the fastening member 25 and the fastened member 26 may not be a combination of a bolt and a nut, but may be another combination as long as the same effect can be obtained. Further, the fastening member 25 may be disposed on the pump casing 23. In this case, the head portion of the fastening member 25 may be disposed in the hollow portion 42, the male screw portion may be disposed in the through hole 41, and the male screw portion may be protruded from the upper surface of the fastening portion 36. Besides the above, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 11 ... Motor, 11a ... Motor casing, 11b ... Stator, 11c ... Rotor, 11d ... Bearing, 12 ... Pump, 13 ... Electrical part, 14 ... Seal member, 14a ... Seal chamber, 21 ... Rotation Axes, 22: impellers, 23: pump casings, 24: casing covers, 25: fastening members, 26: fastened members, 27: first members, 28: second members, 31: suction openings, 32: discharge openings, 33: pump chamber 34: opening 35: attachment surface 36: fastening portion 37: leg 41: through hole 41a: first hole 41b: second hole 42: hollow 42a ... Recesses, 43 ... Meat theft parts, 43a ... Ribs, 100 ... Molds, 101 ... Upper molds, 102 ... Lower molds, 110 ... Cavities, 111 ... First sites, 120 ... Cavities, 121 ... second sites, 270 ... Motor side member, 360 ... fastening , 410 ... through hole, 430 ... thinned-out part.

Claims (6)

A first member that constitutes a part of a pump chamber that accommodates the impeller and to which a casing cover connected to the motor is fixed;
A second member constituting the other part of the pump chamber;
A through hole through which a fastening member for fixing the casing cover is inserted, a hollow portion disposed in the middle of the through hole, a to-be-fastened member disposed in the hollow portion and fastened with the fastening member, the through hole A fastening portion provided in the first member and the second member, having a meat theft portion continuous with the hollow portion;
A pump casing comprising: The first member and the second member are molded of a resin material,
The pump casing according to claim 1, wherein the first member and the second member are configured to be weldable.   The pump according to claim 1, wherein the light-theft portion is continuous with a part of the through hole and a radial direction of the through hole, and is continuous with an axial direction of the hollow portion and the hollow portion. casing. The fastening member is a bolt,
The to-be-fastened member is a nut,
The first member has a first hole portion into which the bolt is inserted and which constitutes a part of the through hole, and a recess which constitutes a portion of the hollow portion,
The pump casing according to claim 1, wherein the recess has at least a pair of flat surfaces that restrict the rotational movement of the nut.   The pump apparatus which has a pump casing as described in any one of Claims 1-4. An outer surface of a first member that constitutes a part of a pump chamber that accommodates an impeller and to which a casing cover connected to a motor is fixed, and a part of a through hole through which a fastening member that fixes the casing cover is inserted And an upper mold having a cavity in the shape of a meat theft portion continuous with a part of the through hole;
A lower mold having a cavity in the shape of a hollow portion that is continuous with the inner surface of the first member, a part of the through hole, and the light theft portion and in which a to-be-fastened member to be fastened with the fastening member is disposed;
A mold characterized by comprising: