Pump device

Abstract

The invention provides a pump device capable of improving versatility even if the shape of a suction part or a discharge part must be changed according to the purpose. A pump device (2) is provided with a pump body (3) and a cover member (4) attached to the pump body (3). The pump main body (3) is provided with a housing (8) that houses the motor and the impeller, and the housing (8) has formed therein a pump chamber in which the impeller and the rotor are disposed, an inflow port (14p) through which the fluid flowing into the pump chamber passes, and an outflow port (14r) through which the fluid flowing out from the pump chamber passes. The cover member (4) is provided with at least one of a suction part (4d) that sucks in fluid from the outside of the pump device (2) toward the inlet (14p), and a discharge part (4e) that discharges fluid from the outlet (14r) toward the outside of the pump device (2).

Description

TECHNICAL FIELD

[0001] The present application relates to a pump device. BACKGROUND

[0002] Conventionally, an electric pump for circulating cooling water is known (for example, refer to Patent Literature 1). The electric pump described in Patent Literature 1 is provided with a pump portion having an impeller, a motor portion having a rotor and a stator, a housing that houses the pump portion and the motor portion, and a flange member fixed to the housing or the like. A pump chamber in which the impeller is disposed is formed in the inside of the housing. The housing is provided with an upper housing and a lower housing. A suction port and a discharge port are formed in the upper housing. The flange member is provided with a mounting structure for mounting the electric pump to an external device.

[0003] [Patent Literature]

[0004] [Patent Literature]

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2018-159337 SUMMARY

[0006] [Problems to be Solved by the Invention]

[0007] The present inventors have developed a pump device that is provided with a suction portion that sucks fluid from the outside of the pump device toward a pump chamber and a discharge portion that discharges fluid from the pump chamber toward the outside of the pump device. The shape or the like of the suction portion or the discharge portion is sometimes changed depending on the purpose for which the pump device is used. In a case where it is necessary to change the shape or the like of the suction portion or the discharge portion depending on various purposes for which the pump device is used, design changes are made to the entire pump device for each purpose, and thus the versatility of the pump device is reduced.

[0008] Thus, an object of the present application is to provide a pump device that is provided with a suction portion that sucks fluid from the outside of the pump device toward a pump chamber and a discharge portion that discharges fluid from the pump chamber toward the outside of the pump device, in which the versatility can be improved even in a case where it is necessary to change the shape or the like of the suction portion or the discharge portion depending on the purpose.

[0009] [Means of Solving the Problems]

[0010] To solve the above-described problems, one embodiment of the present application provides a pump device that is provided with a pump main body and a cover member mounted on the pump main body, in which the pump main body is provided with a motor having a rotor and a stator, an impeller that rotates together with the rotor, and a housing that houses the motor and the impeller, a pump chamber in which the impeller and the rotor are disposed is formed in the housing, an inflow port through which fluid flowing into the pump chamber passes and an outflow port through which fluid flowing out of the pump chamber passes are formed in the housing, and the cover member is provided with at least either one of a suction portion that sucks fluid from the outside of the pump device toward the inflow port and a discharge portion that discharges fluid from the outflow port toward the outside of the pump device.

[0011] In this pump assembly, the cover member mounted on the pump body has at least one of an intake portion for drawing in fluid from the outside of the pump assembly toward an inlet to the pump body, and a discharge portion for discharging fluid from the outlet to the outside of the pump body toward the outside of the pump assembly. Therefore, in this embodiment, when the cover member has both an intake portion and a discharge portion, even if it is necessary to change the shape of at least one of the intake portion and the discharge portion according to the application of the pump assembly, only the cover member needs to be redesigned, without changing the pump body.

[0012] Furthermore, in this method, when the cover component only has an intake section, even if the shape of the intake section must be changed according to the application of the pump device, only the cover component needs to be redesigned, without changing the pump body. Moreover, in this method, when the cover component only has a discharge section, even if the shape of the discharge section must be changed according to the application of the pump device, only the cover component needs to be redesigned, without changing the pump body. Therefore, in this method, even if the shape of the intake or discharge section must be changed according to the application of the pump device, the versatility of the pump device can be improved.

[0013] [Invention Effects]

[0014] As described above, in one aspect of the present invention, in a pump device having an intake section for drawing in fluid from the outside of the pump device toward the pump chamber and an exhaust section for discharging fluid from the pump chamber toward the outside of the pump device, the versatility of the pump device can be improved even when the shape of the intake section or the exhaust section must be changed according to the application of the pump device. Attached Figure Description

[0015] Figure 1 This is a perspective view of a pump device according to an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 An exploded perspective view of the pump unit shown.

[0017] Figure 3 yes Figure 1 A top view of the pump unit shown.

[0018] Figure 4 yes Figure 3 A sectional view of section E-E.

[0019] Figure 5 yes Figure 3 A sectional view of a portion of the F-F section.

[0020] Figure 6 yes Figure 3 A partial sectional view of section G-G.

[0021] Figure 7 is Figure 4 a cross-sectional view of the second housing and the cover member at the H-H section.

[0022] Figure 8 is a perspective view of the second housing shown from the lower surface side. Figure 1

[0023] Figure 9 is an enlarged cross-sectional view for explaining the structure of the pump device of another embodiment of the present application.

[0024] Figure 10 is an enlarged cross-sectional view for explaining the structure of the pump device of another embodiment of the present application.

[0025] Explanation of Reference Numerals

[0026] 2: Pump device

[0027] 3: Pump body

[0028] 4: Cover member

[0029] 4d: Suction portion

[0030] 4e: Discharge portion

[0031] 4g: Mounting portion

[0032] 4k: Cover member side opposite surface

[0033] 5: Impeller

[0034] 6: Motor

[0035] 8: Housing

[0036] 9: Rotor

[0037] 10: Stator

[0038] 14p: Inflow port

[0039] 14r: Outflow port

[0040] 14t: Housing side opposite surface

[0041] 14u: Groove portion

[0042] 14v: Through hole

[0043] 17: Pump chamber

[0044] 34, 35: Sealing member

[0045] Z: Axial direction of the rotor

[0046] Z1: First direction side

[0047] ​Z2: second direction side DETAILED DESCRIPTION

[0048] Embodiments of the present application will be described below with reference to the drawings.

[0049] (Overall configuration of pump device)

[0050] Figure 1 is a perspective view of the pump device 2 of the embodiment of the present application. Figure 2 is an exploded perspective view of the pump device 2 shown in Figure 1 Figure 3 is a plan view of the pump device 2 shown in Figure 1 Figure 4 is a sectional view of the E-E section of Figure 3

[0051] The pump device 2 of the present embodiment is a pump of a type called a centrifugal pump (centrifugal motor pump), for example, used for circulating a fluid for cooling. The fluid of the present embodiment is a liquid such as cooling water. The pump device 2 is provided with a pump main body 3 and a cover member 4 mounted on the pump main body 3. As shown in Figure 4 The pump main body 3 is provided with an impeller 5, a motor 6 that rotates the impeller 5, a circuit board 7 for controlling the motor 6, and a housing 8 that houses the impeller 5, the motor 6, and the circuit board 7. The motor 6 is composed of a rotor 9 and a stator 10.

[0052] In the following description, the Z direction of the rotor 9, the stator 10, and the like will be referred to as the up-down direction, the X direction orthogonal to the up-down direction will be referred to as the front-rear direction, and the Y direction orthogonal to the up-down direction and the front-rear direction will be referred to as the right-left direction. In addition, the Zl direction side of the up-down direction will be referred to as the "upper" side, the Z2 direction side opposite to the upper side will be referred to as the "lower" side, the XI direction side of the front-rear direction will be referred to as the "front" side, the X2 direction side opposite to the front side will be referred to as the "rear" side, the Yl direction side of the right-left direction will be referred to as the "right" side, and the Y2 direction side opposite to the right side will be referred to as the "left" side. The upper side (Zl direction side) of the present embodiment is the first direction side, and the lower side (Z2 direction side) is the second direction side. Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1

[0053] ​​​​​​​​​​​​The housing 8 comprises a first housing 13, a second housing 14 disposed on the upper side of the first housing 13, and a cover member 15 disposed on the lower side of the first housing 13. The first housing 13, the second housing 14, and the cover member 15 are formed of resin. The second housing 14 is joined to the upper end of the first housing 13 by ultrasonic welding. The cover member 15 is fixed to the lower end of the first housing 13 by a plurality of screws 16. A pump chamber 17, in which an impeller 5 and a rotor 9 are disposed, is formed inside the housing 8. The pump chamber 17 is defined by the first housing 13 and the second housing 14. In the pump device 2, liquid is drawn in from the upper side of the pump device 2 and discharged towards the front. Alternatively, the second housing 14 can also be joined to the upper end of the first housing 13 by vibration welding.

[0054] like Figure 4 As shown, the rotor 9 includes a cylindrical drive magnet 19, a magnet holding member 20 that holds the drive magnet 19, and a cylindrical sleeve 21 held by the magnet holding member 20. The magnet holding member 20 is formed of resin. Furthermore, the magnet holding member 20 is formed in a cylindrical shape. Specifically, the magnet holding member 20 is formed in a generally cylindrical shape. The axial directions of the drive magnet 19, the magnet holding member 20, and the sleeve 21 are aligned with the vertical direction.

[0055] A serrated edge 20b, extending radially outward toward the rotor 9, is formed at the midpoint of the magnet holding member 20 in the vertical direction. The serrated edge 20b is annular. A drive magnet 19 is mounted on the outer peripheral surface of the lower portion of the magnet holding member 20. The upper end face of the drive magnet 19 contacts the lower surface of the serrated edge 20b. A sleeve 21 is disposed on the inner peripheral side of the lower portion of the magnet holding member 20.

[0056] The rotor 9 is supported by a fixed shaft 22 and is rotatable. The fixed shaft 22 is configured such that its axial direction and vertical direction are aligned. A recess is formed on the second housing 14 for arranging the upper end of the fixed shaft 22. The portion of the second housing 14 forming this recess is disposed on the inner circumferential side of the upper portion of the magnet holding member 20. The lower end of the fixed shaft 22 is held in the first housing 13. A portion of the fixed shaft 22 is disposed on the inner circumferential side of the sleeve 21. A thrust bearing member 23 is mounted on the fixed shaft 22, contacting the upper end face of the sleeve 21. In this configuration, the sleeve 21 functions as a radial bearing for the rotor 9, and the sleeve 21 and the thrust bearing member 23 function as a thrust bearing for the rotor 9.

[0057] A impeller 5 is provided to an upper end of the rotor 9. The impeller 5 rotates together with the rotor 9. The impeller 5 has a first blade member 24 having a plurality of blades arranged at a constant pitch in the circumferential direction of the rotor 9, and a second blade member 25 formed separately from the first blade member 24 and to which the first blade member 24 is fixed. The impeller 5 of the present embodiment is composed of the first blade member 24 and the second blade member 25. The first blade member 24 is fixed to the upper side of the second blade member 25. The first blade member 24 and the second blade member 25 are formed of resin.

[0058] The first blade member 24 is composed of a plurality of blades and a ceiling portion 24b connecting upper ends of the plurality of blades. The blades project toward the lower side from the ceiling portion 24b. The second blade member 25 is integrally formed with the magnet holding member 20 by injection molding. The second blade member 25 is formed in a shape of a gong expanding toward the radially outer side of the rotor 9 from the upper end of the magnet holding member 20. In addition, the second blade member 25 is formed in a circular ring shape and a flat plate shape. The plurality of blades are fixed to the upper surface side of the second blade member 25 by welding such as ultrasonic welding. Further, the second blade member 25 formed separately from the magnet holding member 20 can be fixed to the upper end portion of the magnet holding member 20.

[0059] The stator 10 is formed in a substantially cylindrical shape as a whole. The stator 10 is disposed on the outer peripheral side of the rotor 9. In addition, the stator 10 is disposed so that the axial direction of the stator 10 coincides with the up-down direction. The stator 10 has a driving coil 27, a stator core 28, and an insulator 29. The stator core 28 has an outer peripheral ring portion formed in a ring shape and a plurality of salient pole portions projecting toward the radially inner side of the rotor 9 from the outer peripheral ring portion. The front end surface of the salient pole portion (the radially inner side surface of the rotor 9) opposes the outer peripheral surface of the driving magnet 19 via an inner side cylinder portion 13b described later which constitutes a part of the first housing 13.

[0060] The insulator 29 is formed of an insulating material such as resin. The driving coil 27 is wound around the salient pole portion of the stator core 28 via the insulator 29. A plurality of terminal pins 30 are attached to the insulator 29. The end portions of the driving coil 27 are electrically connected to and fixed to the terminal pins 30. The terminal pins 30 are electrically connected to and fixed to the circuit board 7.

[0061] The first housing 13 has a cylindrical inner side cylinder portion 13b disposed between the front end surface of the salient pole portion of the stator core 28 and the outer peripheral surface of the driving magnet 19, a bottom portion 13c which plugs the lower end of the inner side cylinder portion 13b, an outer side cylinder portion 13d disposed on the outer peripheral side of the inner side cylinder portion 13b, and a circular ring-shaped upper surface portion 13e which connects the upper end of the inner side cylinder portion 13b and the upper end of the outer side cylinder portion 13d. In addition, the first housing 13 has a fixing portion 13f which welds and fixes the second housing 14, and a terminal stage 13g which provides a terminal pin 31 for electrically connecting the pump device 2 to an external device.

[0062] The stator 10 is disposed between the inner cylindrical portion 13b and the outer cylindrical portion 13d. The stator 10 is also disposed below the upper surface portion 13e. The circuit board 7 is disposed below the bottom portion 13c. The fixing portion 13f is formed in the shape of an edge extending radially outward from the outer peripheral surface of the outer cylindrical portion 13d toward the rotor 9. The fixing portion 13f is also formed in the shape of a ring. The fixing portion 13f is disposed above the center of the outer cylindrical portion 13d in the vertical direction. The terminal block 13g protrudes forward from the outer peripheral surface of the outer cylindrical portion 13d. The terminal pin 31 is electrically connected to and fixed to the circuit board 7.

[0063] The circuit board 7 is a rigid substrate such as a glass epoxy resin plate, formed into a flat plate shape. The circuit board 7 is configured such that its thickness direction and vertical direction are aligned. Furthermore, the circuit board 7 is disposed on the outside of the pump chamber 17. The circuit board 7 is fixed to the first housing 13. The first housing 13 serves to prevent liquid from the pump chamber 17 from flowing into the stator 10 and the placement area of ​​the circuit board 7. The cover member 15 is fixed to the lower end side of the first housing 13 to cover the circuit board 7 from below. A sealing member 32 is disposed between the first housing 13 and the cover member 15 to prevent liquid from entering the stator 10 and the placement area of ​​the circuit board 7. The sealing member 32 is an O-ring.

[0064] (Structure of the second housing and cover components)

[0065] Figure 5 yes Figure 3 A sectional view of a portion of the F-F section. Figure 6 yes Figure 3 A partial sectional view of section G-G. Figure 7 yes Figure 4 A cross-sectional view of the second housing 14 and the cover component 4 at the H-H section. Figure 8 Represented from the lower surface side Figure 1 A perspective view of the second housing 14 is shown. Furthermore, in Figure 5 , Figure 6 The diagram of motor 6 is omitted in the text.

[0066] As described above, the second housing 14 is disposed above the first housing 13. The cover member 4 covers the second housing 14 from above. Sealing members 34 and 35 (see reference 1) are disposed between the cover member 4 and the second housing 14 to prevent liquid from entering between the cover member 4 and the second housing 14. Figure 4 That is, the pump assembly 2 includes sealing components 34 and 35 between the housing 8 covered by the cover component 4 and the cover component 4 to prevent liquid from entering. The sealing components 34 and 35 are O-rings.

[0067] The second housing 14 has an upper side cylindrical portion 14b formed in a cylindrical shape and a lower side cylindrical portion 14c formed in a cylindrical shape and disposed at a lower side than the upper side cylindrical portion 14b. The upper side cylindrical portion 14b is disposed so that the axial direction of the upper side cylindrical portion 14b coincides with the up-down direction, and the lower side cylindrical portion 14c is disposed so that the axial direction of the lower side cylindrical portion 14c coincides with the up-down direction. The upper side cylindrical portion 14b and the lower side cylindrical portion 14c are formed in a cylindrical shape with a short length in the up-down direction. The outer diameter of the lower side cylindrical portion 14c is larger than the outer diameter of the upper side cylindrical portion 14b. The inner diameter of the lower side cylindrical portion 14c is larger than the inner diameter of the upper side cylindrical portion 14b.

[0068] In addition, the second housing 14 has a circular ring-shaped upper surface portion 14d connected to the upper end of the upper side cylindrical portion 14b, a circular ring-shaped connecting portion 14e connecting the lower end of the upper side cylindrical portion 14b and the upper end of the lower side cylindrical portion 14c, a cylindrical-shaped inflow port forming portion 14f protruding toward the upper side from the center of the upper surface portion 14d, a square tube-shaped outflow port forming portion 14g extending toward the front side from the right end portion of the upper side cylindrical portion 14b, a circular ring-shaped sealing member disposing portion 14h in which the sealing member 35 is disposed, and three fixing portions 14j for fixing the cover member 4 to the second housing 14.

[0069] The inner peripheral side of the inflow port forming portion 14f and the inner peripheral side of the outflow port forming portion 14g communicate with the inner peripheral side of the upper side cylindrical portion 14b. The sealing member disposing portion 14h is formed in a shape of a gong that expands toward the radial direction outside of the rotor 9 from the outer peripheral surface of the lower end portion of the lower side cylindrical portion 14c. On the upper surface of the sealing member disposing portion 14h, a ring-shaped recessed portion 14k in which the sealing member 35 is disposed is formed. The recessed portion 14k is recessed toward the lower side from the upper surface of the sealing member disposing portion 14h. The lower surface side of the sealing member disposing portion 14h is welded and fixed to the fixing portion 13f of the first housing 13. Between the lower surface of the sealing member disposing portion 14h and the upper surface of the fixing portion 13f, a slight gap is formed at a position inside the radial direction of the rotor 9 from the portion of the sealing member disposing portion 14h to which the fixing portion 13f is welded (hereinafter, this portion is referred to as a "welding and fixing portion 36").

[0070] The three fixing portions 14j protrude radially outward from the outer peripheral surface of the sealing member disposing portion 14h toward the radial direction outside of the rotor 9. The three fixing portions 14j are disposed at equal intervals in the circumferential direction of the rotor 9. The upper surface of the fixing portion 14j is disposed on the same plane as the upper surface of the sealing member disposing portion 14h. In the fixing portion 14j, a circular hole-shaped through hole that penetrates the fixing portion 14j in the up-down direction is formed. In the through hole, a cylindrical-shaped spacer 37 is disposed.

[0071] The impeller 5 is arranged on the inner peripheral side of the upper cylindrical portion 14b. The connecting portion 14e is arranged on the upper side than the upper surface portion 13e of the first housing 13. A gap is formed between the lower surface of the connecting portion 14e and the upper surface of the upper surface portion 13e. The upper end portion of the outer cylindrical portion 13d of the first housing 13 is arranged on the inner peripheral side of the lower cylindrical portion 14c. A gap is formed between the inner peripheral surface of the lower cylindrical portion 14c and the outer peripheral surface of the upper end portion of the outer cylindrical portion 13d.

[0072] In the present embodiment, the inner peripheral side of the inner cylindrical portion 13b of the first housing 13, the inner peripheral side of the upper cylindrical portion 14b, the inner peripheral side of the inflow port forming portion 14f, and the inner peripheral side of the outflow port forming portion 14g become the pump chamber 17. In addition, the gap between the lower surface of the connecting portion 14e and the upper surface of the upper surface portion 13e, the gap between the inner peripheral surface of the lower cylindrical portion 14c and the outer peripheral surface of the upper end portion of the outer cylindrical portion 13d, and the gap between the lower surface of the sealing member arrangement portion 14h and the upper surface of the fixing portion 13f on the inner side in the radial direction of the rotor 9 than the welding fixing portion 36 also constitute a part of the pump chamber 17.

[0073] The upper end of the inflow port forming portion 14f becomes an inflow port 14p through which a liquid flowing into the pump chamber 17 passes. The inflow port 14p is formed in a circular shape. The front end of the outflow port forming portion 14g becomes an outflow port 14r through which a liquid flowing out of the pump chamber 17 passes. The outflow port 14r is formed in an oblong shape. That is, the inflow port 14p and the outflow port 14r are formed in the housing 8. On the outer peripheral surface on the upper end side of the inflow port forming portion 14f, an annular recessed portion 14s in which the sealing member 34 is arranged is formed. The recessed portion 14s is recessed from the outer peripheral surface on the upper end side of the inflow port forming portion 14f toward the inner side in the radial direction of the rotor 9.

[0074] On the outer peripheral surface of the second housing 14, an annular housing side counter surface 14t that surrounds the outflow port 14r is formed. The housing side counter surface 14t is constituted by the portion of the outer peripheral surface of the lower cylindrical portion 14c arranged on the lower side of the outflow port forming portion 14g and the front end surface of the outflow port forming portion 14g. The housing side counter surface 14t is formed in a curved surface shape having a curvature radius equal to that of the outer peripheral surface of the lower cylindrical portion 14c. In addition, the housing side counter surface 14t is formed in a square annular shape. On the housing side counter surface 14t, a groove portion 14u recessed toward the inner side of the second housing 14 is formed.

[0075] The groove portion 14u is formed in a straight line shape extending downward from the lower end of the flow outlet 14r. That is, the groove portion 14u communicates with the flow outlet 14r. The groove portion 14u is formed between the lower end of the flow outlet 14r and the upper surface of the seal member arrangement portion 14h. The depth of the groove portion 14u becomes deeper as it goes downward. Further, on the second housing 14, a through-hole 14v connected to the groove portion 14u is formed. The through-hole 14v is formed in a straight line shape that penetrates the seal member arrangement portion 14h in the up-down direction. The upper end of the through-hole 14v is connected to the lower end of the groove portion 14u. The through-hole 14v is formed at the inner side end of the seal member arrangement portion 14h in the radial direction of the rotor 9. The size of the through-hole 14v gradually becomes larger as it goes downward.

[0076] As described above, the gap between the lower surface of the seal member arrangement portion 14h on the radially inner side of the rotor 9 than the welded fixing portion 36 and the upper surface of the fixing portion 13f also constitutes a part of the pump chamber 17, and the part of the pump chamber 17 is arranged on the lower side than the groove portion 14u. The through-hole 14v is arranged on the radially inner side of the rotor 9 than the welded fixing portion 36, and is connected to the part of the pump chamber 17 arranged on the lower side than the groove portion 14u. That is, the through-hole 14v is formed on the housing 8, and the through-hole 14v communicates with the part of the pump chamber 17 arranged on the lower side than the groove portion 14u, and communicates with the groove portion 14u.

[0077] The cover member 4 is formed of resin. The cover member 4 has a cylindrical portion 4b formed in a cylindrical shape. The cylindrical portion 4b is arranged so that the axial direction of the cylindrical portion 4b coincides with the up-down direction. The cylindrical portion 4b is formed in a cylindrical shape with a short length in the up-down direction. Further, the cover member 4 has an upper surface portion 4c in a circular ring shape connected to the upper end of the cylindrical portion 4b. The cover member 4 covers the second housing 14 from the radially outer side of the rotor 9 and from the upper side. That is, the cover member 4 covers a part of the housing 8 from the radially outer side of the rotor 9 and from the upper side.

[0078] Further, the cover member 4 has a suction portion 4d that sucks liquid from the inflow port 14p of the second housing 14 toward the outside of the pump device 2, a discharge portion 4e that discharges liquid from the outflow port 14r of the second housing 14 toward the outside of the pump device 2, and three fixing portions 4f for fixing the cover member 4 to the second housing 14. Also, the cover member 4 has a mounting portion 4g for mounting the pump device 2 to an external device. The cover member 4 of the present mode has two mounting portions 4g.

[0079] The upper surface of the cover member 4 becomes a plane orthogonal to the up-down direction. The upper surface of the upper surface portion 4c constitutes a part of the upper surface of the cover member 4. The inner diameter of the upper side portion of the cylinder portion 4b is smaller than the inner diameter of the lower side portion of the cylinder portion 4b. The inner diameter of the upper side portion of the cylinder portion 4b is larger than the outer diameter of the upper side cylinder portion 14b of the second housing 14. In addition, the inner diameter of the upper side portion of the cylinder portion 4b is smaller than the outer diameter of the lower side cylinder portion 14c of the second housing 14. The inner diameter of the lower side portion of the cylinder portion 4b is substantially equal to the outer diameter of the lower side cylinder portion 14c of the second housing 14. The upper side cylinder portion 14b is disposed on the inner peripheral side of the upper side portion of the cylinder portion 4b. The lower side cylinder portion 14c is disposed on the inner peripheral side of the lower side portion of the cylinder portion 4b.

[0080] Three fixing portions 4f protrude radially outward from the outer peripheral surface of the cylinder portion 4b toward the rotor 9. The three fixing portions 4f are disposed at the same positions as the three fixing portions 14j of the second housing 14 in the circumferential direction of the rotor 9. The upper surface of the fixing portion 4f is disposed on the same plane as the upper surface of the upper surface portion 4c. The lower surface of the fixing portion 4f is disposed on the same plane as the lower end surface of the cylinder portion 4b.

[0081] In the fixing portion 4f, a through-hole in the shape of a circular hole that penetrates the fixing portion 4f in the up-down direction is formed. A cylindrical sleeve 38 is fixed in the through-hole. An internal thread is formed on the inner peripheral surface of the sleeve 38. The cover member 4 is fixed to the second housing 14 by three screws 39. A part of the screw 39 is disposed on the inner peripheral side of the spacer 37. In addition, a part of the screw 39 is disposed on the inner peripheral side of the sleeve 38 and engages with the internal thread of the sleeve 38.

[0082] The flow inlet formation portion 14f of the second housing 14 is disposed in the through-hole formed in the center of the upper surface portion 4c. The sealing member 34 is in contact with the bottom surface of the recess 14s of the flow inlet formation portion 14f and the inner peripheral surface of the through-hole of the upper surface portion 4c at a prescribed contact pressure. The lower end surface of the cylinder portion 4b is in contact with the upper surface of the sealing member disposition portion 14h. The lower surface of the fixing portion 4f is in contact with the upper surface of the fixing portion 14j. The sealing member 35 is in contact with the lower end surface of the cylinder portion 4b and the bottom surface of the recess 14k at a prescribed contact pressure.

[0083] The mounting portion 4g extends from the outer peripheral surface of the cylinder portion 4b toward both sides in the left-right direction. A hole 4h for mounting is formed in the mounting portion 4g. The suction portion 4d is formed in the shape of a cylinder protruding upward from the center of the upper surface portion 4c. The suction portion 4d is disposed on the upper side of the flow inlet formation portion 14f. The inner peripheral side of the suction portion 4d is in communication with the inner peripheral side of the cylinder portion 4b. In addition, the inner peripheral side of the suction portion 4d is in communication with the inner peripheral side of the flow inlet formation portion 14f.

[0084] The discharge portion 4e is formed in a cylindrical shape that protrudes toward the front side from the right end portion of the lower side portion of the cylinder portion 4b. The discharge portion 4e is disposed on the front side of the flow port forming portion 14g. In the cylinder portion 4b, an angular hole-shaped through hole 4j that connects the inner peripheral side of the cylinder portion 4b and the inner peripheral side of the discharge portion 4e is formed, and the inner peripheral side of the discharge portion 4e communicates with the inner peripheral side of the cylinder portion 4b. The through hole 4j penetrates the cylinder portion 4b. In addition, the inner peripheral side of the discharge portion 4e communicates with the inner peripheral side of the flow port forming portion 14g.

[0085] As described above, the housing-side opposing surface 14t is formed on the outer peripheral surface of the second housing 14. The cover member-side opposing surface 4k is formed on the inner peripheral surface of the cylinder portion 4b so as to oppose the housing-side opposing surface 14t. That is, the housing-side opposing surface 14t is formed on the outer peripheral surface of the portion of the housing 8 that is covered by the cover member 4 from the radially outer side of the rotor 9, and the cover member-side opposing surface 4k is formed on the inner peripheral surface of the cover member 4 that covers the portion of the housing 8 from the radially outer side of the rotor 9.

[0086] The cover member-side opposing surface 4k is formed in a ring shape that surrounds the through hole 4j. The cover member-side opposing surface 4k is formed in a curved surface shape having a curvature radius that is substantially equal to the curvature radius of the housing-side opposing surface 14t that is formed in a curved surface shape. In addition, the cover member-side opposing surface 4k is formed in a square ring shape. The housing-side opposing surface 14t and the cover member-side opposing surface 4k are in slight contact with each other. Alternatively, the housing-side opposing surface 14t and the cover member-side opposing surface 4k oppose each other with a slight gap therebetween.

[0087] (Main effects of the present embodiment)

[0088] As described above, in the present embodiment, the cover member 4 that is mounted on the pump main body 3 is provided with the suction portion 4d and the discharge portion 4e. Therefore, in the present embodiment, even when it is necessary to change the shape or the like of at least either one of the suction portion 4d and the discharge portion 4e in accordance with the use of the pump device 2, it is only necessary to design the cover member 4, and it is not necessary to change the pump main body 3. Therefore, in the present embodiment, even when it is necessary to change the shape or the like of at least either one of the suction portion 4d and the discharge portion 4e in accordance with the use of the pump device 2, it is possible to improve the versatility of the pump device 2.

[0089] In the present embodiment, the cover member 4 is provided with the mounting portion 4g for mounting the pump device 2 to an external device. Therefore, in the present embodiment, even when it is necessary to change the shape or the position or the like of the mounting portion 4g in accordance with the use of the pump device 2, it is not necessary to change the pump main body 3. Therefore, in the present embodiment, it is possible to further improve the versatility of the pump device 2.

[0090] In the present embodiment, liquid flows from between the housing-side opposing surface 14t and the cover member-side opposing surface 4k, and it is possible for air to accumulate in the gap between the second housing 14 and the cover member 4, which is covered by the cover member 4. When air accumulates, pressure loss occurs, and it can not be possible to properly discharge liquid using the pump device 2. However, in the present embodiment, the housing-side opposing surface 14t is formed on the outer peripheral surface of the second housing 14, and the groove portion 14u, which communicates with the flow outlet 14r, is formed on the housing-side opposing surface 14t. Therefore, in the present embodiment, even if air accumulates in the gap between the second housing 14 and the cover member 4, the air in the gap can be discharged from the discharge portion 4e together with the liquid via the groove portion 14u using the large negative pressure of the liquid that is generated at the flow outlet 14r. Therefore, in the present embodiment, it is possible to suppress the generation of malfunctions due to air accumulation in the gap between the second housing 14 and the cover member 4.

[0091] In the present embodiment, the through hole 14v, which communicates with a portion of the pump chamber 17 that is disposed on the lower side than the groove portion 14u and which communicates with the groove portion 14u, is formed in the second housing 14. Therefore, in the present embodiment, even if air is mixed in the pump chamber 17, the air in the pump chamber 17 can be discharged from the discharge portion 4e together with the liquid via the through hole 14v and the groove portion 14u using the large negative pressure of the liquid that is generated at the flow outlet 14r.

[0092] (Alteration Example 1 of Pump Device)

[0093] Figure 9 is an enlarged sectional view for explaining the structure of the pump device 2 of another embodiment of the present application. Furthermore, in Figure 9 , the same symbols are attached to structures that are the same as those of the above-described embodiments.

[0094] In the above-described embodiments, the cover member 4 can not be provided with the suction portion 4d. In this case, for example, as shown in Figure 9 , the second housing 14 is provided with the suction portion 14w. The suction portion 14w is formed, for example, in a cylindrical shape that is connected to the upper end of the flow inlet formation portion 14f and extends upward from the upper end of the flow inlet formation portion 14f. In this alteration example, the upper end of the suction portion 14w becomes the flow inlet 14p.

[0095] In this alteration example, even if it is necessary to change the shape of the discharge portion 4e and the like in accordance with the use of the pump device 2, it is only necessary to design the cover member 4, and it is not necessary to change the pump body 3. Therefore, even if it is necessary to change the shape of the discharge portion 4e and the like in accordance with the use of the pump device 2, it is possible to improve the versatility of the pump device 2. Furthermore, in this alteration example, the suction portion, which is formed separately from the second housing 14, can be fixed to the upper end side of the flow inlet formation portion 14f.

[0096] (Alteration Example 2 of Pump Device)

[0097] Figure 10 is an enlarged sectional view for explaining the structure of the pump device 2 of another embodiment of the present application. In addition, in Figure 10 , the same symbols are attached to the same structures as those of the above-described mode.

[0098] In the above-described mode, the cover member 4 can not be provided with the discharge portion 4e. In this case, for example, as shown in Figure 10 , the second housing 14 is provided with a discharge portion 14x. The discharge portion 14x is formed, for example, in a cylindrical shape connected to the front end of the flow port forming portion 14g and extending to the front side from the front end of the flow port forming portion 14g. In this modified example, the front end of the discharge portion 14x becomes the flow port 14r.

[0099] In this modified example, even in a case where it is necessary to change the shape of the suction portion 4d or the like according to the use of the pump device 2, it is only necessary to design the cover member 4, and it is not necessary to change the pump body 3. Therefore, even in a case where it is necessary to change the shape of the suction portion 4d or the like according to the use of the pump device 2, it is possible to improve the versatility of the pump device 2. In addition, in this modified example, the discharge portion formed separately from the second housing 14 can also be fixed to the front end side of the flow port forming portion 14g.

[0100] (Other Embodiments)

[0101] The above-described mode is an example of the best mode of the present application, but is not limited thereto, and various modifications can be made within a range not changing the gist of the present application.

[0102] In the above-described mode, the groove portion 14u can not be formed on the housing side opposing surface 14t of the second housing 14. In addition, in the above-described mode, a groove portion communicating with the flow port 14r can be formed on the cover member side opposing surface 4k of the cover member 4 in addition to or instead of the groove portion 14u formed on the housing side opposing surface 14t. This groove portion is formed, for example, in a straight line shape extending to the lower side from the lower end of the flow port 14r similarly to the groove portion 14u.

[0103] In the above-described mode, a recess for weight reduction can be formed on the cover member 4 so as to be recessed toward the lower side from the upper surface of the cover member 4. In addition, in the above-described mode, the through hole 14v can not be formed on the second housing 14. Furthermore, in the above-described mode, the mounting portion 4g can not be formed on the cover member 4. In addition, according to the use, the pump body 3 in a state where the cover member 4 is not mounted can be used as a pump device.

[0104] (Structure of the Present Technology)

[0105] In addition, the present technology can adopt the following structure.

[0106] (1) A pump device including a pump main body and a cover member attached to the pump main body, wherein

[0107] The pump main body includes a motor having a rotor and a stator, an impeller rotating together with the rotor, and a housing accommodating the motor and the impeller,

[0108] The housing has a pump chamber in which the impeller and the rotor are disposed, an inlet through which a fluid flowing into the pump chamber passes, and an outlet through which the fluid flowing out of the pump chamber passes,

[0109] The cover member has at least one of a suction portion that sucks the fluid from outside the pump device toward the inlet and a discharge portion that discharges the fluid from the outlet toward outside the pump device.

[0110] (2) The pump device according to (1), wherein the cover member has the suction portion and the discharge portion.

[0111] (3) The pump device according to (1) or (2), wherein the cover member has an attachment portion for attaching the pump device to an external device.

[0112] (4) The pump device according to any one of (1) to (3), wherein the cover member covers a portion of the housing.

[0113] (5) The pump device according to (4), wherein a sealing member for preventing the fluid from being immersed between the portion of the housing covered by the cover member and the cover member is provided.

[0114] (6) The pump device according to (4) or (5), wherein the discharge portion is formed in the cover member,

[0115] The fluid is a liquid,

[0116] A portion of the housing is covered by the cover member from a radially outer side of the rotor,

[0117] An annular housing-side counter surface surrounding the outlet is formed on an outer peripheral surface of the portion of the housing covered by the cover member from the radially outer side of the rotor,

[0118] A cover member-side counter surface opposite to the housing-side counter surface is formed on an inner peripheral surface of the cover member covering the portion of the housing from the radially outer side of the rotor,

[0119] A groove portion communicating with the outlet is formed in at least one of the housing-side counter surface and the cover member-side counter surface.

[0120] (7) The pump device according to (6), wherein, when an axial one side of the rotor is set as a first direction side, and an opposite side of the first direction side is set as a second direction side,

[0121] The impeller is provided on the first direction side end of the rotor,

[0122] The groove portion is formed on the housing side opposite surface and is formed in a straight line shape extending from the flow outlet toward the second direction side,

[0123] A portion of the pump chamber is disposed on the second direction side than the groove portion,

[0124] A through hole is formed on the housing, the through hole communicates with the portion of the pump chamber disposed on the second direction side than the groove portion, and communicates with the groove portion.

[0125] In the present embodiment, the cover member preferably has a suction portion and a discharge portion. When configured as such, even if it is necessary to change the shape or the like of at least either of the suction portion and the discharge portion depending on the use of the pump device, it is not necessary to change the pump main body. Therefore, even if it is necessary to change the shape or the like of at least either of the suction portion and the discharge portion depending on the use of the pump device, it is possible to improve the versatility of the pump device.

[0126] In the present embodiment, the cover member preferably has a mounting portion for mounting the pump device to an external device. When configured as such, even if it is necessary to change the shape or the position or the like of the mounting portion depending on the use of the pump device, it is not necessary to change the pump main body. Therefore, it is possible to further improve the versatility of the pump device.

[0127] In the present embodiment, for example, the cover member covers a portion of the housing. In addition, in the present embodiment, for example, the pump device has a sealing member for preventing the fluid from entering between the portion of the housing covered by the cover member and the cover member.

[0128] In the present embodiment, for example, the discharge portion is formed on the cover member, the fluid is a liquid, a portion of the housing is covered by the cover member from the radial outer side of the rotor, a housing side opposite surface surrounding the flow outlet is formed on the outer peripheral surface of the portion of the housing covered by the cover member from the radial outer side of the rotor, a cover member side opposite surface opposite to the housing side opposite surface is formed on the inner peripheral surface of the cover member covering the portion of the housing from the radial outer side of the rotor, and a groove portion communicating with the flow outlet is formed on at least either of the housing side opposite surface and the cover member side opposite surface.

[0129] In this case, liquid flows from between the housing side opposite surface and the cover member side opposite surface to the gap between the portion of the housing covered by the cover member and the cover member, and sometimes air accumulation occurs in the gap. When air accumulation occurs, pressure loss occurs, and liquid can not be properly discharged by the pump device. However, in this case, a groove portion communicating with the flow outlet is formed in at least either of the housing side opposite surface and the cover member side opposite surface, and therefore, even if air accumulation occurs in the gap between the portion of the housing and the cover member, the air in the gap can be discharged from the discharge portion together with the liquid via the groove portion by the large negative pressure of the liquid generated at the flow outlet. Therefore, generation of an adverse effect due to air accumulation occurring in the gap between the portion of the housing and the cover member can be suppressed.

[0130] In the present embodiment, for example, when one side of the rotor in the axial direction is set as a first direction side, and the opposite side of the first direction side is set as a second direction side, the impeller is provided at the first direction side end of the rotor, the groove portion is formed in the housing side opposite surface, and is formed in a straight line shape extending from the flow outlet toward the second direction side, a portion of the pump chamber is disposed on the second direction side of the groove portion, a through hole is formed in the housing, the through hole communicates with the portion of the pump chamber disposed on the second direction side of the groove portion, and the through hole communicates with the groove portion. In this case, even if air is mixed in the pump chamber, the air in the pump chamber can be discharged from the discharge portion together with the liquid via the through hole and the groove portion by the large negative pressure of the liquid generated at the flow outlet.

Claims

1. A pump device provided with a pump main body and a cover member attached to the pump main body, characterized in that the pump main body is provided with an electric motor having a rotor and a stator, an impeller rotating together with the rotor, and a housing accommodating the electric motor and the impeller, a pump chamber in which the impeller and the rotor are disposed is formed on the housing, a flow inlet through which a fluid flowing into the pump chamber passes is formed on the housing, and a flow outlet through which the fluid flowing out from the pump chamber passes is formed on the housing, and the cover member is provided with at least either one of a suction portion that sucks the fluid from the outside of the pump device toward the flow inlet or a discharge portion that discharges the fluid from the flow outlet toward the outside of the pump device.

2. The pump device according to claim 1, characterized in that the cover member is provided with the suction portion and the discharge portion.

3. The pump device according to claim 1 or 2, characterized in that the cover member is provided with an attachment portion for attaching the pump device to an external device.

4. The pump device according to claim 1 or 2, characterized in that the cover member covers a portion of the housing.

5. The pump device according to claim 4, characterized in that a sealing member for preventing the fluid from being immersed between the portion of the housing covered by the cover member and the cover member is provided.

6. The pump device according to claim 4, characterized in that the discharge portion is formed on the cover member, the fluid is a liquid, the portion of the housing covered by the cover member is on a radially outer side of the rotor, an annular housing-side counter surface surrounding the flow outlet is formed on an outer peripheral surface of the portion of the housing covered by the cover member on the radially outer side of the rotor, a cover member-side counter surface opposite to the housing-side counter surface is formed on an inner peripheral surface of the cover member covering the portion of the housing on the radially outer side of the rotor, and a groove portion communicating with the flow outlet is formed on at least either one of the housing-side counter surface and the cover member-side counter surface.

7. The pump device according to claim 6, characterized in that when one side of the rotor in an axial direction is set as a first direction side and the opposite side of the first direction side is set as a second direction side, the impeller is disposed at a side end of the first direction side of the rotor, the groove portion is formed on the housing-side counter surface and is formed in a straight line shape extending from the flow outlet toward the second direction side, a portion of the pump chamber is disposed on the second direction side of the groove portion, a through hole is formed on the housing, the through hole communicates with the portion of the pump chamber disposed on the second direction side of the groove portion and communicates with the groove portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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