JP2019082158A - Pump device and filter structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device capable of capturing and removing a foreign substance. SOLUTION: A pump device includes an impeller 1, a rotary shaft 2 to which the impeller 1 is fixed and a shaft through hole 2a penetrating inside is formed, and a slide bearing 21 that rotatably supports the rotary shaft 2. 22, the pump casing 4 accommodating the impeller 1, and the flow hole 5a fixed to the opening on the high pressure side of the pump casing 4 and connecting the space where the slide bearings 21 and 22 are arranged and the inside of the pump casing 4. The casing cover 5 is provided with a first filter structure 50 arranged in the flow hole 5a, and a second filter structure 60 arranged in the axial through hole 2a. [Selection diagram] Fig. 1

Description

  The present invention relates to a pump device for transporting a liquid and a filter structure applicable to the pump device.

  The canned motor pump is a pump device having a structure for taking in the handling liquid (liquid) inside the motor and circulating it to cool the motor and lubricate the slide bearing. In the slide bearing portion that supports the main shaft (rotational shaft), the main shaft rises due to the dynamic pressure of the handling liquid, that is, the so-called wedge effect by the water film of the handling liquid. Hereinafter, the canned motor pump may be called a pump apparatus.

  One of the features of the slide bearing is that there is no contact with the main shaft during the operation of the pump device, and it has a long life. It is necessary to avoid the contamination of the handling liquid constituting the water film with foreign matter that may deteriorate the roughness of the sliding surface between the slide bearing and the main shaft.

  The direct feed water supply apparatus is a water supply apparatus which directly takes in the pressure of the handling liquid in the main water pipe into the apparatus and achieves a desired lift by activating the pump when the pump can not obtain a sufficient lift. Because of this, even when the operation of the pump device is stopped, the pressure of the handling liquid in the main water pipe is always applied to the pump device. In the case of a lift which does not require the operation of the pump device, the handling liquid (in this case, tap water) flows into the pump device even when the pump is stopped.

  By the way, there is a possibility that foreign substances in piping (pipe rust, fine sand, dust of sealing agent at the time of piping connection, etc.) may be mixed in the tap water. In addition, precipitates such as calcium carbonate may be mixed into tap water as foreign matter. Therefore, in mounting the canned motor pump on the direct feed water supply device, measures against foreign matter are required.

Japanese Patent Application Laid-Open No. 58-5496 Unexamined-Japanese-Patent No. 11-324971 JP, 2011-17294, A

  The pump device may be provided with a filter for capturing foreign matter contained in the handling liquid. However, since foreign matter trapped on the filter is deposited on the filter, the filter needs to be cleaned after a predetermined period of time has elapsed. Also, if an unexpected foreign matter is accumulated on the filter, the filter may be clogged, the handling liquid may not be taken into the motor, and the motor may not be sufficiently cooled and / or abnormal wear of the slide bearing may occur. .

Then, an object of this invention is to provide the pump apparatus which can perform capture | acquisition and removal of a foreign material.
An object of the present invention is to provide a filter structure capable of capturing and removing foreign matter.

  In one aspect, an impeller, a rotary shaft having the through-hole formed therein, to which the impeller is fixed, a slide bearing rotatably supporting the rotary shaft, and a pump for housing the impeller A casing, a casing cover fixed to an opening on the high pressure side of the pump casing and having a passage hole connecting the space in which the slide bearing is disposed and the inside of the pump casing, and the passage hole A pump device comprising: a first filter structure; and a second filter structure disposed in the axial through hole.

In a preferred aspect, the first filter structure includes a first filter main body covering the flow through hole, and a pressing member limiting movement of the first filter main body in a direction away from the flow through hole. The pressing member is characterized by having a window portion communicating with the flow through hole through the first filter main body.
In a preferred aspect, the casing cover includes an annular recess in which the through hole is formed and disposed concentrically with the rotation axis, and the first filter structure is attached to the annular recess. It is characterized by

In a preferred aspect, the second filter structure includes a second filter main body covering the axial through hole, and a stopper restricting movement of the second filter main body in a direction away from the axial through hole. The stopper has a communication hole communicating with the axial through hole via the second filter main body.
In a preferred aspect, the stopper includes a first portion fixed to an end of the rotation shaft, and a second portion connected to the first portion and extending in the axial direction of the rotation shaft. A hole is formed in the second portion, and the second filter main body is disposed in a space formed by the first portion and the second portion.
In a preferred aspect, the stopper includes a first portion inserted into an insertion portion formed in the through hole of the rotating shaft, and the filter body is formed by the insertion portion and the first portion. It is characterized by being arranged in space.

  Another aspect of the present invention is to accommodate an impeller, a rotary shaft on which the impeller is fixed and in which an axial through hole is formed, a slide bearing rotatably supporting the rotary shaft, and the impeller The present invention is applied to a pump device comprising a pump casing, and a casing cover fixed to an opening on the high pressure side of the pump casing and having a passage hole connecting the space in which the slide bearing is disposed and the inside of the pump casing. Filter structure, the filter structure comprising: a first filter structure locatable in the flow through hole; and a second filter structure locatable in the axial through hole; The first filter structure includes a first filter main body capable of covering the flow through hole, and a pressing member capable of restricting movement of the first filter main body in a direction away from the flow through hole. With which the pressing member is characterized by having a communicable windows section into the flow hole through said first filter body.

  In still another aspect, an impeller, a rotary shaft having the axial hole fixed therein and having a through hole formed therein, a slide bearing rotatably supporting the rotary shaft, and the impeller are accommodated. A pump device comprising: a pump casing; and a casing cover fixed to an opening on the high pressure side of the pump casing and having a passage hole connecting a space in which the slide bearing is disposed and the inside of the pump casing. It is an applicable filter structure, The said filter structure is provided with the 1st filter structure which can be arrange | positioned to the said through-hole, and the 2nd filter structure which can be arrange | positioned to the said axial through-hole, The second filter structure includes a second filter body capable of covering the axial through hole, and a stop capable of restricting movement of the second filter main body in a direction away from the axial through hole. And a chromatography, the stopper is characterized in that it has a communicable possible passage to the shaft hole via the second filter body.

  The pump device includes a first filter structure disposed in the flow through hole and a second filter structure disposed in the axial through hole. Therefore, during operation of the pump device, the first filter structure captures foreign matter in the liquid, and the foreign matter deposited on the second filter structure is removed. At the time of shutdown of the pump device, the second filter structure captures foreign matter in the liquid, and the foreign matter deposited on the first filter structure is removed. As a result, the pump device can perform capture and removal of foreign matter.

FIG. 1 shows an embodiment of a pump device. It is an expanded sectional view of the 1st filter structure arranged in a casing cover. It is a front view of a 1st filter structure. It is the sectional view on the AA line of FIG. It is a figure which shows the processus | protrusion formed in the casing cover. FIG. 6 illustrates one embodiment of a second filter structure. FIG. 7 shows another embodiment of the second filter structure. FIG. 7 is a view showing still another embodiment of the second filter structure. It is a figure which shows the flow of the liquid in a pump apparatus at the time of driving | operation of a pump apparatus. It is a figure which shows the flow of the liquid in a pump apparatus at the time of the stop of a pump apparatus. It is a figure which shows the pump apparatus applied to the liquid transfer system which transfers the liquid in a receiving water tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings to be described below, the same or corresponding components are denoted by the same reference numerals and redundant description will be omitted.

  FIG. 1 is a diagram showing an embodiment of a pump device. In the present embodiment, the pump device is a canned motor pump. The canned motor pump has a structure in which the liquid circulates inside. As shown in FIG. 1, the canned motor pump comprises a pump P and a motor unit M for driving the pump P. The pump P includes an impeller 1 for transferring liquid, a rotating shaft (spindle) 2 to which the impeller 1 is fixed, a liner ring 3 disposed so as to surround a liquid inlet of the impeller 1, and an impeller And a pump casing 4 accommodating the liner ring 3.

  A casing cover 5 is fixed to the opening on the high pressure side of the pump casing 4. The rotating shaft 2 extends through the casing cover 5 and the impeller 1 is fixed to the end of the rotating shaft 2 (more specifically, the end on the pump casing side). An axial through hole 2 a penetrating in the direction of the axis line CL is formed inside the rotation shaft 2, and is opened at both ends of the rotation shaft 2. The axial through hole 2 a is parallel to the axis line CL of the rotation axis 2.

  In the casing cover 5, a plurality of flows for guiding a part of the liquid sucked into the pump casing 4 to the motor portion M, more specifically, to the gap between the slide bearings 21 and 22 and the rotary shaft 2. Holes 5a are formed. A portion of the liquid pressurized by the rotation of the impeller 1 is guided to the motor unit M through the plurality of flow holes 5a. Although two flow holes 5 a are illustrated in FIG. 1, the number of the flow holes 5 a is not limited to this embodiment. The flow holes 5a are arranged at equal intervals along the circumferential direction of the rotation shaft 2 (that is, the casing cover 5).

  The pump device includes a motor 10 for rotating the rotation shaft 2, slide bearings 21 and 22 for rotatably supporting the rotation shaft 2, and a motor frame 12 for accommodating the rotation shaft 2, the motor 10 and the slide bearings 21 and 22. Is equipped. The motor 10 includes a motor rotor 15 fixed to the rotating shaft 2 and a motor stator 16 disposed around the motor rotor 15. The motor stator 16 includes a stator core 16a and a plurality of coils 16b wound around the stator core 16a. The plurality of coils 16 b are disposed so as to surround the motor rotor 15.

  The rotating shaft 2 is rotatably supported by slide bearings 21 and 22 disposed on both sides of the motor rotor 15. The slide bearing 21 has a radial portion 21a for supporting the radial load of the rotary shaft 2, and a thrust portion 21b for supporting the thrust load of the rotary shaft 2 (more specifically, the thrust plate 25 fixed to the rotary shaft 2). It consists of Similarly, the slide bearing 22 is composed of a radial portion 22a and a thrust portion 22b. The thrust plates 25, 25 have an annular shape, and are fixed to the rotating shaft 2 at positions on both sides of the motor rotor 15. The thrust plates 25, 25 rotate integrally with the rotating shaft 2.

  A cylindrical can 18 is disposed between the motor rotor 15 and the motor stator 16 so as to surround the motor rotor 15. The motor stator 16 is disposed between the motor frame 12 and the can 18. The motor stator 16 is in contact with the inner surface of the motor frame 12 and the outer surface of the can 18. The motor rotor 15, the motor stator 16, and the can 18 are arranged concentrically. The motor stator 16 is disposed in a stator chamber 11 formed by the motor frame 12, the casing cover 5, and the can 18.

  An annular seal member 17 is disposed between the casing cover 5 and the pump casing 4. The seal member 17 prevents liquid from flowing out of the gap to the outside of the pump device. An end cover 19 is disposed on the opposite side of the casing cover 5, and the end opening of the motor frame 12 is closed by the end cover 19.

  The cylindrical radial portion 21a is disposed between the rotary shaft 2 and the casing cover 5, and a slight gap is formed between the outer peripheral surface of the rotary shaft 2 and the inner peripheral surface of the radial portion 21a. . Similarly, the cylindrical radial portion 22a is disposed between the rotary shaft 2 and the end cover 19, and a slight gap is formed between the outer peripheral surface of the rotary shaft 2 and the inner peripheral surface of the radial portion 22a. It is done.

  The annular thrust portion 21 b is disposed between the thrust plate 25 and the casing cover 5. The annular thrust portion 22 b is disposed between the thrust plate 25 and the end cover 19.

  When current flows through the coil 16 b of the motor stator 16, a magnetic field is formed in the motor stator 16, and the motor rotor 15 is rotated by the magnetic field. The rotation of the motor rotor 15 rotates the impeller 1 through the rotation shaft 2. When the impeller 1 rotates with the rotating shaft 2, the liquid is sucked into the pump casing 4 from the suction port 4a, pressurized by rotation of the impeller 1, and then discharged from the discharge port 4b.

  The pump device comprises a filter structure. The filter structure includes a first filter structure 50 disposed in the through hole 5 a of the casing cover 5 and a second filter structure 60 disposed in the axial through hole 2 a of the rotary shaft 2. The details of these filter structures will be described below with reference to the drawings.

  FIG. 2 is an enlarged cross-sectional view of the first filter structure 50 disposed on the casing cover 5. FIG. 3 is a front view of the first filter structure 50. FIG. FIG. 4 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 2, the casing cover 5 constitutes a part of the stator chamber 11 and includes an outer portion 30 adjacent to the motor frame 12, an inner portion 31 extending toward the impeller 1 from the outer portion 30, and an outer portion An annular recess 32 is provided between the portion 30 and the inner portion 31. The portions 30, 31 and the annular recess 32 are integrally configured. The casing cover 5 (i.e., the outer portion 30, the inner portion 31 and the annular recess 32) has an annular shape as a whole, and is disposed concentrically with the rotation shaft 2. The flow hole 5 a is formed in an annular recess 32 disposed concentrically with the rotation shaft 2.

  The first filter structure 50 is attached to the annular recess 32 of the casing cover 5. The first filter structure 50 includes a filter main body 51 covering the flow through hole 5 a of the casing cover 5, and a pressing member 52 limiting movement of the filter main body 51 in a direction away from the flow through hole 5 a.

  The filter main body 51 is a net-like member in which a large number of openings are formed, and can capture foreign matter in the liquid. The pressing member 52 has an annular shape and is disposed concentrically with the rotation shaft 2. The pressing member 52 has a size that can be in close contact with the annular recess 32 of the casing cover 5. In one embodiment, the pressing member 52 is composed of an elastically deformable elastic member such as a resin.

  The pressing member 52 includes a plurality of windows 52 a communicating with the flow hole 5 a via the filter main body 51. The windows 52 a are arranged at equal intervals along the circumferential direction of the pressing member 52. In the present embodiment, the pressing member 52 includes six window portions 52a, but the number of the window portions 52a is not limited to this embodiment.

  In FIG. 4, the illustration of the filter main body 51 is omitted in order to make the drawing easy to see. As shown in FIG. 4, the window 52 a extends to the axis line CL of the rotary shaft 2 and is open at the pump side end face 52 b and the motor side end face 52 c of the pressing member 52.

  In one embodiment, the filter main body 51 may be attached to the motor-part-side end face 52c of the pressing member 52 so as to cover the window 52a. In this case, the filter body 51 has a size larger than that of the window 52a, and covers the window 52a. The filter main body 51 may be a plurality of filter main bodies 51 arranged at equal intervals along the circumferential direction of the pressing member 52, and may be configured from a single member having an annular shape. The single filter body 51 is disposed concentrically with the pressing member 52 and the rotating shaft 2.

  In another embodiment, the filter main body 51 may be attached to the window 52 a so as to be located inside each window 52 a of the pressing member 52. In this case, the filter body 51 is composed of a plurality of members.

  As shown in FIG. 3, the pressing member 52 includes an outer ring portion 53 in contact with the outer side surface 32 a of the annular recess 32, an inner ring portion 54 in contact with the inner side surface 32 b of the ring recess 32, an outer ring portion 53 and an inner ring portion 54. And a plurality of connection sites 55 for connecting the The plurality of connection portions 55 are arranged at equal intervals along the circumferential direction of the pressing member 52. The windows 52 a are formed between the adjacent connection portions 55. The inner surface 32 b of the annular recess 32 is connected to the inner portion 31, and the outer surface 32 a is connected to the outer portion 30.

  As shown in FIG. 4, the outer circumferential surface 53 a of the outer ring portion 53 is a tapered surface in which the cross-sectional area of the outer ring portion 53 gradually increases from the motor portion side toward the pump side. Therefore, when the first filter structure 50 is attached to the annular recess 32 of the casing cover 5, the pressing member 52 is smoothly inserted into the annular recess 32, and the outer peripheral surface 53 a of the outer ring portion 53 is the outer surface 32 a of the annular recess 32. Close to As a result, separation of the pressing member 52 from the casing cover 5 is prevented.

  FIG. 5 is a view showing the projection 56 formed on the casing cover 5. As shown in FIG. 5, in order to reliably prevent separation of the pressing member 52 from the casing cover 5, the annular recess 32 may be formed with a protrusion 56 extending from the outer surface 32a to the inner surface 32b. . The protrusion 56 is connected to the outer side surface 32a. The protrusions 56 may be a single member having an annular shape connected to the outer side surface 32 a, or may be a plurality of members arranged at equal intervals along the circumferential direction of the annular recess 32.

  In one embodiment, the protrusions 56 may be connected to the inner surface 32b and extend from the inner surface 32b toward the outer surface 32a. In other embodiments, the protrusions 56 may be provided on both the outer surface 32a and the inner surface 32b.

  FIG. 6 is a diagram showing an embodiment of the second filter structure 60. As shown in FIG. As shown in FIG. 6, the second filter structure 60 has a filter body 61 that covers the axial through hole 2 a of the rotary shaft 2 and a stopper that restricts movement of the filter main body 61 in a direction away from the axial through hole 2 a And a movement restricting member) 62.

  The filter main body 61 is a reticulated member in which a large number of openings are formed similarly to the filter main body 51, and the filter main body 61 can capture foreign substances in the liquid.

  The stopper 62 is connected to a first portion (in the present embodiment, a nut portion) 63 fixed to the end of the rotation shaft 2 and the first portion 63 and extends in the direction of the axis line CL of the rotation shaft 2 In the present embodiment, the bag portion 64 is provided. The filter body 61 is disposed in a space formed between the first portion 63 and the second portion 64.

  The first portion 63 has a tubular shape, and a thread groove is formed on the inner peripheral surface of the first portion 63. A thread groove corresponding to the thread groove of the first portion 63 is formed on the outer peripheral surface of the rotation shaft 2. The size of the inner peripheral surface of the first portion 63 is larger than the outer peripheral surface of the rotation shaft 2. Therefore, the first portion 63 is screwed to the rotating shaft 2 by tightening the stopper 62. The stopper 62 can fix the impeller 1 to the rotating shaft 2 by tightening.

  The second portion 64 has a dome shape, and a communication hole 65 communicating with the axial through hole 2 a of the rotary shaft 2 through the filter main body 61 is formed in the second portion 64. The communication hole 65 penetrates the second portion 64 and extends in the direction of the axis line CL of the rotation shaft 2. The size of the communication hole 65 is the same as or smaller than the axial through hole 2a. Furthermore, the size of the communication hole 65 is smaller than that of the filter body 61. Therefore, the stopper 62 can reliably prevent the filter main body 61 from falling off. The second portion 64 covers the filter body 61, and the communication hole 65 is disposed at a position spaced apart from the shaft through hole 2 a and the filter body 61.

  In the embodiment shown in FIG. 6, the stopper 62 is a cap nut member having a communication hole 65. The structure of the stopper 62 is not limited to the embodiment of FIG. FIG. 7 is a view showing another embodiment of the second filter structure 60. As shown in FIG. As shown in FIG. 7, the stopper 62 may have a cap shape in which the communication hole 65 is formed. In the embodiment shown in FIG. 7, the second portion 64 does not have a dome shape, but has a shape that is bent in the middle on the way. Also in the present embodiment, the size of the communication hole 65 is the same as or smaller than the axial through hole 2a. Furthermore, the size of the communication hole 65 is smaller than that of the filter body 61. Therefore, the stopper 62 can reliably prevent the filter main body 61 from falling off.

  FIG. 8 is a view showing still another embodiment of the second filter structure 60. As shown in FIG. As shown in FIG. 8, the second filter structure 60 has a filter body 61 that covers the axial through-hole 2 a of the rotary shaft 2 and a stopper that limits movement of the filter main body 61 in the direction away from the axial through-hole 2 a And a movement restricting member 66). The stopper 66 is connected to a first portion (screw portion) 68 inserted in the insertion portion 2 b formed in the axial through hole 2 a of the rotation shaft 2 and the first portion 68, and extends outward in the radial direction of the rotation shaft 2 And a second portion (head) 67. The filter body 61 is disposed in the space formed by the insertion portion 2 b and the first portion 68.

  The stopper 66 has a communication hole 69 communicating with the shaft through hole 2 a via the filter main body 61. The communication hole 69 penetrates the first portion 68 and the second portion 67 and extends in the direction of the axis CL of the rotation shaft 2. The size of the communication hole 69 is the same as the axial through hole 2 a of the rotary shaft 2 or smaller than the axial through hole 2 a. The size of the communication hole 69 is smaller than that of the filter body 61.

  In the present embodiment, the stopper 66 is a screw member inserted into the rotating shaft 2. The insertion portion 2b of the rotary shaft 2 is a screw hole into which the first portion 68 of the stopper 66 can be screwed, and is in communication with the shaft through hole 2a. The insertion portion 2 b is connected to the end of the rotation shaft 2. The first portion 68 is screwed to the rotary shaft 2 by tightening the stopper 66 in a state where the filter main body 61 is inserted into the insertion portion 2 b. The second portion 67 can fix the impeller 1 to the rotation shaft 2 by tightening the stopper 66. The filter body 61 is disposed in the space formed by the insertion portion 2 b of the rotation shaft 2 and the first portion 68.

  In the embodiment described above, the second filter structure 60 is disposed at the pump casing side end of the rotation shaft 2, but may be disposed at the end cover side end of the rotation shaft 2.

  The pump device according to the present embodiment is applied to a direct feed water supply device. The direct feed water supply apparatus directly takes in the pressure of the liquid in the water main pipe into the pump apparatus, and when this pressure can not obtain a sufficient lift, the pump apparatus is activated to realize the desired lift. In the present embodiment, the pressure of the liquid in the main water pipe is always applied to the inside of the pump apparatus not only when the pump apparatus is operating but also when the operation is stopped. In the case of a lift which does not require the operation of the pump, the liquid flows into the pump also at the time of operation of the pump. Hereinafter, the flow of the liquid in the pump device will be described with reference to the drawings.

  FIG. 9 is a diagram showing the flow of liquid in the pump device during operation of the pump device. As shown by the arrows in FIG. 9, a portion of the liquid sucked into the pump casing 4 passes through the window 52a of the first filter structure 50, the filter body 51, and the flow passage holes 5a to form the motor portion M, , Guided to the space in which the slide bearings 21 and 22 are disposed. At this time, the pressure of the liquid flowing from the pump P to the motor unit M acts on the filter body 51.

  The foreign matter contained in the liquid sucked into the pump casing 4 is captured by the filter body 51 of the first filter structure 50 disposed in the flow hole 5a, so the liquid passing through the flow hole 5a contains foreign matter. It is not done. Therefore, the entry of foreign matter into the motor unit M is prevented. The foreign matter captured by the first filter structure 50 is deposited on the filter body 51.

  The liquid that has passed through the flow hole 5a is guided to the space in which the slide bearing 21 is disposed, and flows through the gap between the thrust portion 21b and the thrust plate 25. Furthermore, the gap between the radial portion 21a and the rotation shaft 2 Flow through. The impeller 1 is formed with a through hole 1 a extending in the axial direction. The liquid supplied to the gap between the slide bearing 21 and the rotary shaft 2 is returned into the impeller 1 through the through hole 1 a of the impeller 1. Since the stator chamber 11 is sealed, the liquid does not contact the motor stator 16 in the stator chamber 11.

  A portion of the liquid introduced to the motor unit M is introduced to the space in which the slide bearing 22 is disposed, through a slight gap between the motor rotor 15 and the can 18. The liquid flows through the gap between the thrust portion 22 b and the thrust plate 25, and further flows through the gap between the radial portion 22 a and the rotating shaft 2. In this way, the liquid cools and lubricates the rotating shaft 2 and the sliding bearing 22.

  The liquid that has flowed through the slight gap between the slide bearing 22 and the rotary shaft 2 is returned into the pump casing 4 through the shaft through hole 2 a of the rotary shaft 2, the filter body 61 and the communication hole 65. At this time, the pressure of the liquid flowing from the motor unit M to the pump P acts on the filter main body 61. The stopper 66 restricts the movement of the filter body 61 in the direction away from the axial through hole 2 a. Therefore, the detachment of the filter body 61 from the stopper 66 is prevented.

  The size of the communication hole 65 of the stopper 62 is determined according to the circulation flow rate of the liquid circulating inside the pump device. Therefore, by changing the size of the communication hole 65, the circulation flow rate of the liquid can be easily adjusted without changing the size of the axial through hole 2a of the rotary shaft 2. For example, when the circulation flow rate of the liquid is reduced, the size of the communication hole 65 is reduced (orifice effect).

  The canned motor pump according to the present embodiment takes in part of the liquid (handling liquid) from the high pressure side of the pump casing 4 into the interior of the motor unit M, and cools the interior of the motor unit M and lubricates the sliding bearings 21, 22. It can be carried out. Furthermore, the canned motor pump has a structure in which the liquid is allowed to flow through the axial through hole 2 a in the central portion of the rotary shaft 2 to the suction side of the pump casing 4.

  In the pump device applied to the direct feed water supply device, when the operation of the pump device is not required, ie, when the operation of the pump device is stopped, the high pressure liquid flows from the suction side to the discharge side of the pump casing 4. The liquid circulating inside M reverses. FIG. 10 is a diagram showing the flow of liquid in the pump device at the time of operation stop of the pump device. In FIG. 10, since the flow of the liquid flowing through the motor unit M is opposite to the flow of the liquid shown in FIG. 9, the detailed description of the flow of the liquid flowing through the motor unit M is omitted.

  As shown by the arrows in FIG. 10, when the operation of the pump device is stopped, a part of the liquid that has flowed into the pump casing 4 is guided to the motor unit M through the axial through hole 2a of the rotary shaft 2. Foreign matter contained in the liquid flowing into the pump casing 4 is captured by the filter main body 61 of the second filter structure 60 disposed in the axial through hole 2 a and is deposited on the filter main body 61. Therefore, the liquid passing through the axial through hole 2a does not contain foreign matter, and the foreign matter is prevented from entering the motor portion M.

  The liquid having passed through the axial through hole 2 a passes through a slight gap between the motor rotor 15 and the can 18. Thereafter, the liquid is returned into the pump casing 4 through the flow hole 5a, the filter body 51, and the window 52a. At this time, the pressure of the liquid flowing from the motor unit M to the pump P acts on the filter body 51. The pressing member 52 restricts the movement of the filter body 51 in the direction away from the flow hole 5 a. Therefore, detachment of the filter main body 51 from the pressing member 52 is prevented.

  At the time of operation stop of the pump device, the foreign matter deposited on the filter body 51 of the first filter structure 50 is removed by the pressure of the liquid flowing from the motor unit M to the pump P through the flow hole 5a and Released. Thus, the filter body 51 is released from the clogging.

  During operation of the pump device, foreign matter deposited on the filter body 61 of the second filter structure 60 is removed by the pressure of the liquid flowing from the motor unit M to the pump P through the axial through hole 2a and is contained in the pump casing 4 Released. Thus, the filter body 61 is released from the clogging. The pump device can prevent clogging of the filter structures 50 and 60 (more specifically, the filter bodies 51 and 61).

  In the pump device in the direct feed water supply device, the direction of the flow of the liquid circulating in the pump device is switched due to the operation and stop of the pump device. Since the pump device includes the first filter structure 50 and the second filter structure 60, it is possible to repeat trapping of foreign matter by the filter bodies 51, 61 and cleaning of the filter bodies 51, 61.

  In general, if foreign matter is deposited on the filter, the filter can not perform its original function sufficiently, so it is necessary to clean the filter after a predetermined period of time. In addition, when there is an unexpected accumulation of foreign matter, the filter is clogged and the liquid can not be taken into the motor unit. As a result, undercooling in the motor part and / or abnormal wear of the slide bearing may be caused.

  According to the present embodiment, the pump device can capture foreign substances in the liquid passing through the flow through hole 5a by the first filter structure 50 during the operation, and the first filter structure 50 can prevent the foreign matter in the liquid passing through the axial through hole 2a. The foreign matter captured by the two filter structure 60 can be removed. Furthermore, the pump device can capture foreign substances in the liquid passing through the axial through hole 2a by the second filter structure 60 when the operation is stopped, and the first filter structure by the liquid passing through the through hole 5a Foreign matter trapped in 50 can be removed.

  According to the present embodiment, it is not necessary to clean the filter structures 50, 60 even after the predetermined period has elapsed. Furthermore, since clogging of the filter main bodies 51 and 61 can be prevented, it is possible to prevent insufficient cooling in the motor section M and / or the occurrence of abnormal wear of the slide bearings 21 and 22.

  The direct connection water supply device has a basic configuration (defined by the Japan Water Works Association) with alternating operation (parallel alternating operation) by two pump devices. Therefore, even if the target pressure of the liquid to be transferred is a high lift which always requires the operation of the pump device, the direction of the flow of the liquid in the pump device is always changed since only one pump device is always operated. To be done. Therefore, the pump device in operation and the pump device in shutdown can exhibit the effects described above.

  Although the embodiment described above describes the embodiment in which the pump device is applied to the direct feed water supply device, the pump device may be applied to a system for transferring the liquid in the water receiving tank to the outside. FIG. 11 is a view showing a pump device applied to a liquid transfer system for transferring the liquid in the water receiving tank 100. As shown in FIG. 11, the water receiving tank 100 is disposed above the pump device. One end of the inflow pipe 101 is connected to the bottom of the water receiving tank 100, and the other end is connected to the suction port 4a of the pump device. An outlet pipe 102 is connected to the outlet 4b of the pump device.

  Also in the embodiment shown in FIG. 11, the pressure of the liquid in the water receiving tank 100 is always applied to the pump device when the operation of the pump device is stopped. Therefore, the pump device can exhibit the same effects as the effects described above.

  The embodiments described above are described for the purpose of enabling one skilled in the art to which the present invention belongs to to practice the present invention. Various modifications of the above-described embodiment can naturally be made by those skilled in the art, and the technical idea of the present invention can also be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in the broadest scope in accordance with the technical concept defined by the claims.

Reference Signs List 1 impeller 1a through hole 2 rotation shaft 2a shaft through hole 2b insertion part 3 liner ring 4 pump casing 4a suction port 4b discharge port 5 casing cover 5a flow hole 10 motor 11 stator chamber 12 motor frame 15 motor rotor 16 motor stator 16a stator core 16b Coil 17 Seal member 18 Can 21, 22 Slide bearing 21a, 22a Radial portion 21b, 22b Thrust portion 25 Thrust plate 30 Outer portion 31 Inner portion 32 Annular recess 32a Outer surface 32b Inner side surface 50 First filter structure 51 Filter main body 52 Member 52a Window 52b Pump side end face 52c Motor part side end face 53 Outer ring portion 53a Outer peripheral surface 54 Inner ring portion 55 Connection portion 56 Projection 60 Second filter structure 61 Filter body 62, 66 Stopper 63 First Position (nut portion)
64 second part (bag part)
65, 69 communicating hole 67 second part (head)
68 1st part (screw part)
P pump M motor section

Claims (8)

With the impeller,
A rotating shaft on which the impeller is fixed and in which an axial through hole is formed;
A slide bearing rotatably supporting the rotating shaft;
A pump casing for accommodating the impeller;
A casing cover fixed to an opening on the high pressure side of the pump casing and formed with a flow hole connecting the space in which the slide bearing is disposed and the inside of the pump casing;
A first filter structure disposed in the flow hole;
And a second filter structure disposed in the axial through hole. The first filter structure is
A first filter body covering the flow through hole;
And a pressing member for restricting the movement of the first filter body in the direction away from the flow hole.
The pump device according to claim 1, wherein the pressing member has a window portion communicating with the flow hole via the first filter main body. The casing cover includes an annular recess in which the flow hole is formed and which is disposed concentrically with the rotation axis.
The pump device according to claim 1, wherein the first filter structure is attached to the annular recess. The second filter structure is
A second filter body covering the axial through hole;
A stopper for restricting movement of the second filter body in a direction away from the axial through hole;
The pump device according to any one of claims 1 to 3, wherein the stopper has a communication hole communicating with the axial through hole via the second filter main body. The stopper is
A first portion fixed to an end of the rotation shaft;
And a second portion connected to the first portion and extending in the axial direction of the rotation axis,
The communication hole is formed in the second portion,
The pump device according to claim 4, wherein the second filter body is disposed in a space formed by the first portion and the second portion. The stopper includes a first portion inserted into an insertion portion formed in the through hole of the rotation shaft,
The pump device according to claim 4, wherein the filter body is disposed in a space formed by the insertion portion and the first portion. An impeller, a rotary shaft on which the impeller is fixed and having an axial through hole formed therein, a slide bearing rotatably supporting the rotary shaft, a pump casing for housing the impeller, and A filter structure applicable to a pump device comprising: a casing cover fixed to an opening on the high pressure side of a pump casing and having a space in which the slide bearing is disposed and a through hole connecting the inside of the pump casing And
The filter structure is
A first filter structure that can be disposed in the flow hole;
And a second filter structure that can be disposed in the axial through hole,
The first filter structure is
A first filter body capable of covering the flow through hole;
And a pressing member capable of restricting movement of the first filter main body in a direction away from the flow hole.
The filter structure characterized in that the pressing member has a window portion which can communicate with the flow hole through the first filter main body. An impeller, a rotary shaft on which the impeller is fixed and having an axial through hole formed therein, a slide bearing rotatably supporting the rotary shaft, a pump casing for housing the impeller, and A filter structure applicable to a pump device comprising: a casing cover fixed to an opening on the high pressure side of a pump casing and having a space in which the slide bearing is disposed and a through hole connecting the inside of the pump casing And
The filter structure is
A first filter structure that can be disposed in the flow hole;
And a second filter structure that can be disposed in the axial through hole,
The second filter structure is
A second filter body capable of covering the axial through hole;
And a stopper capable of restricting movement of the second filter body in a direction away from the axial through hole,
The filter structure characterized in that the stopper has a communication hole which can communicate with the axial through hole via the second filter main body.

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