JP5414406B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device for transferring a fluid, and more particularly, a motor housed in a motor chamber, and an impeller fixed to the tip of an output shaft of the motor and housed in an impeller chamber, and the rotation of the impeller It is related with the pump apparatus which transfers a fluid.

  In general households, the remaining hot water in the bath is used as washing water for saving. In order to facilitate such work, some washing machines include a pump device that pumps up remaining hot water in a bathtub and transfers it to a washing tub. As this type of pump device, so-called self-priming pump devices are often used because it is necessary to suck out the air accumulated in the hose connecting the washing machine and the bathtub at the start of operation (perform a self-priming operation). ing.

  Patent Document 1 below discloses an example of a conventional self-priming pump device. This pump device has a structure in which fluid is transferred by rotation of an impeller fixed to an output shaft of a motor, and a motor and an impeller are disposed in a case. FIG. 7 is a schematic view showing a seal structure of a conventional self-priming pump device as described in Patent Document 1.

  As shown in the figure, the motor 103 has an output shaft 104 rotatably supported by an output side bearing 108 and a counter output side bearing 109. An impeller 102 is fixed to the tip of the output shaft 104. The impeller 102 has a cylindrical portion 102a in which a fixing hole into which the output shaft 104 of the motor 103 is inserted (press-fitted) is formed. A seal member (oil seal) 106 is in contact with the outer peripheral surface of the cylindrical portion 102 a via a metal fitting 102 b provided integrally with the impeller 102. The seal member 106 infiltrates fluid (hereinafter sometimes simply referred to as water) transferred by the rotation of the impeller 102 into the motor 103 (from the impeller chamber in which the impeller is stored into the motor chamber in which the motor is stored). Stop to not. This protects the motor 103 having electrical components such as coils and prevents water leakage to the outside of the apparatus.

  The metal fitting 102b is a member provided integrally with the impeller 102 by insert molding or the like, and is a member that protects the impeller 102 from being worn by sliding contact with the seal member 106.

  In this pump device, the output shaft 104 of the motor 103 is supported by the output-side bearing 108 and the non-output-side bearing 109 in a state where play is given to such an extent that it slightly fluctuates in the axial direction. The movement (play amount) of the output shaft 104 in the axial direction is restricted within a predetermined range by contact between the upper end surface 102c of the impeller 102 fixed to one end and the lower end surface 108a of the output side bearing 108.

JP 2002-81393 A

  By the way, in the conventional pump device having such a configuration, since the metal fitting 102b is a metal part formed by pressing, the dimensional accuracy (cylindricity) is higher than that of a part formed by injection molding such as the seal member 106. Low. That is, in the conventional pump device, water may enter the motor 103 side due to a decrease in sealing performance accompanying wear of the seal member 106 that is in sliding contact with the metal fitting 102b.

  On the other hand, as shown in FIG. 8, the inventor of the present application has taken a measure of exerting a sealing function by bringing the sealing member 106 into contact with the output shaft 104 of the motor. With such a configuration, the output shaft 104 of the motor 103 is a part having a high degree of cylindricity formed by cutting or the like, and therefore the wear of the seal member 106 is higher than the configuration in which the metal fitting 102b and the seal member 106 are in contact with each other. Can be suppressed and the sealing performance can be improved.

  However, in the configuration shown in FIG. 8, the seal member 106 is disposed not on the radially outer side of the impeller 102 but on the axially outer side (motor 103 side). That is, the seal member 106 is located between the impeller 102 and the output side bearing 108. Therefore, as in the configuration shown in FIG. 7, the movement of the output shaft 104 in the axial direction is restricted by bringing the upper end surface 102 c of the impeller 102 and the lower end surface 108 a of the output side bearing 108 into contact with each other. I can't. For example, the movement of the output shaft 104 can be restricted by the contact between the upper end surface 102c of the impeller 102 and the seal member 106. However, the seal performance of the seal member 106 may be deteriorated, which is not appropriate. . Therefore, the inventor of the present application moves the output shaft 104 in the axial direction by contacting the end (upper end) 104a of the output shaft 104 opposite to the side on which the impeller 102 is fixed and the case 110 of the pump device. Adopted a configuration in which is regulated within a predetermined range.

  However, in such a configuration, the pressure of the fluid applied to the impeller 102 during operation of the apparatus changes irregularly depending on various conditions, so the output shaft 104 moves up and down irregularly, and the output shaft 104 and the case 110 are moved up and down. There was a problem that a rattling noise would be generated due to the contact. In particular, when the contact portion between the output shaft 104 and the case 110 as shown in FIG. 8 is located outside the apparatus, the collision sound easily leaks to the outside, which is a serious problem in terms of the quietness of the apparatus. It was.

  In view of the above problems, the problem to be solved by the present invention is that the sealing performance of the sealing member that prevents the intrusion of fluid from the impeller chamber in which the impeller is disposed to the motor chamber in which the motor is disposed and the sealing member An object of the present invention is to provide a pump device that improves the durability and is excellent in quietness with reduced noise generated by regulating the movement of the output shaft of the motor within a predetermined range.

In order to solve the above problems, a pump device according to the present invention includes a motor, an impeller fixed to one end of an output shaft of the motor, a motor chamber in which the motor is accommodated, and the impeller. A case provided with an impeller chamber serving as a flow path for fluid transferred by rotation of the impeller, and a seal member that contacts the output shaft and prevents entry of fluid from the impeller chamber into the motor chamber, The case includes a convex portion that protrudes in a cylindrical shape from the center of the bottom surface of the motor chamber, the concave portion is formed in the impeller chamber by the convex portion, and the seal member is disposed on a non-output side of the convex portion. The impeller is provided in the motor chamber so as to be positioned, and the impeller includes a blade portion and a cylindrical portion protruding from the blade portion to the opposite output side and positioned in the concave space, and the output shaft , Provided so as to be movable by a predetermined amount in the axial direction, one end of which is fixed to the cylindrical portion, and the movement of the output shaft in the axial direction is on the non-output side of the cylindrical portion. The gist is that it is regulated by the bottom of the concave space facing the counter-output end surface which is an end surface .
The case includes the motor chamber and includes a case main body in which the convex portion is formed, and an impeller case that forms the impeller chamber together with the case main body, and the output shaft is provided at the center of the convex portion. A through hole is formed, and the seal member is disposed in the motor chamber so as to sandwich a bottom portion of the concave space between the cylindrical portion and the cylindrical portion formed in the concave space formed by the convex portion. It is good to have.

According to the pump device according to the present invention having such a configuration, the seal member provided in the motor chamber is disposed in contact with the output shaft so as to be located on the opposite output side of the convex portion formed in the case. By ensuring the high sealing performance by the sealing member and the high durability of the sealing member, noise generated by regulating the movement of the output shaft within a predetermined range can be reduced by the fluid flowing in the impeller chamber. . That is, since the movement of the output shaft in the axial direction is restricted by the bottom surface of the concave space facing the counter-output end surface that is the end surface on the counter-output side of the cylindrical portion, the impeller and the impeller inner wall The impulsive sound is reduced by the fluid flowing in the impeller chamber, and the pump device can be excellent in silence.

In this case, the stator of the motor is molded with resin, and the seal member is fixed to a recess formed in the resin portion, and the opening of the recess is partially or entirely outer wall of the impeller chamber. If it is covered with, it is suitable . Moreover, the said convex part is good to comprise so that the opening of the said recessed part may be block | closed by entering and positioning in the said recessed part.

  As described above, when the seal member is fixed to the recess formed in the resin that molds the stator, if at least a part of the opening of the recess is covered by the outer wall of the impeller chamber, the recess of the seal member Is prevented from falling off. As described above, the wall constituting the impeller chamber functions as a restricting member that restricts the movement of the output shaft of the motor as described above, and also functions as a drop-off preventing member that prevents the seal member from falling off. You don't have to increase

  In addition, a gas-liquid separation chamber for separating the fluid discharged from the impeller chamber into liquid and gas may be provided in the case.

  In this way, in the case of a so-called self-priming pump device capable of separating gas and liquid, if the gas-liquid separation chamber is constituted by the case constituting the motor chamber and the impeller chamber, the number of parts is increased. As a result, the manufacturing cost of the device is reduced.

According to the pump device of the present invention, the case includes a convex portion that protrudes in a cylindrical shape from the center of the bottom surface of the motor chamber, and a concave space is formed in the impeller chamber by the convex portion, and the seal member Is provided in the motor chamber so as to be located on the opposite output side of the convex portion, and the impeller projects to the opposite output side from the blade portion and the blade portion, and is located in the concave space. The output shaft is provided so as to be movable by a predetermined amount in the axial direction, one end of the output shaft is fixed to the cylindrical portion, and the movement of the output shaft in the axial direction is since thus constructed is restricted by the bottom surface of the concave space facing the counter output end face is an end face of the anti-output side of the Jo unit, collision noise between the impeller and the impeller chamber walls is reduced by the fluid flowing through the impeller chamber . Therefore, as compared with the conventional pump device, it is possible to obtain a pump device that is excellent in silence while ensuring high sealing performance and high durability of the seal member.

It is sectional drawing of the pump apparatus which concerns on one Embodiment of this invention. It is a disassembled perspective view of the cross section of the pump apparatus shown in FIG. It is the A section enlarged view in FIG. 1 which expanded the sealing member and the impeller. It is the B section enlarged view in FIG. 3 which expanded the fitting structure of a stator (mold part) and a case main body. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is the schematic for demonstrating the seal structure which the conventional pump apparatus has. It is the schematic for demonstrating the position control structure of the motor output shaft in the axial direction which a conventional pump apparatus has.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a self-priming pump device 1 (hereinafter simply referred to as a pump device 1) having a gas-liquid separation function according to this embodiment, and FIG. 2 is an exploded perspective view of the cross section. FIG. In the following description, the axial direction refers to the axial direction of the output shaft 14 of the motor 10, that is, the vertical direction in FIG. 1, and the radial direction refers to the radial direction of the output shaft 14 of the motor 10, that is, the axial direction. The orthogonal direction shall be said. Further, the output side (the output side of the motor 10) refers to the lower side in FIG. 1, and the counter-output side (the counter-output side of the motor 10) refers to the upper side in FIG.

  The pump device 1 according to this embodiment includes a motor 10, an impeller 20 fixed to one end of an output shaft 14 of the motor 10, a motor chamber 38 in which the motor 10 is stored, and an impeller chamber 39 in which the impeller 20 is stored. And a seal member (oil seal) 40 that contacts the output shaft 14 and prevents fluid from entering the motor chamber 38 from the impeller chamber 39 and prevents water leakage to the outside of the apparatus. With.

  The motor 10 includes a rotor 12 and a stator 16. The motor 10 is a so-called outer rotor type motor in which a magnet (permanent magnet) 121 of the rotor 12 is disposed outside the stator 16. Such an outer rotor type motor can increase the outer diameter of the rotor as compared with an inner rotor type motor of the same size, in which the rotor magnet is disposed inside the stator 16. The output torque can be increased.

  The rotor 12, which is such an outer rotor, includes an output shaft 14 and a magnet 121 that are connected by a connecting member 122. As described above, the magnet 121 is positioned so as to face the outer peripheral surface of the stator 16. On the other hand, the output shaft 14 is located inside the stator 16.

  The stator 16 located inside the magnet includes a drive coil 161, a stator core 162 that is magnetized by a magnetic field generated from the drive coil 161, and the like. As shown in FIG. 1, the stator 16 is molded (covered) with a synthetic resin material (hereinafter, a resin portion where the stator 16 is molded is referred to as a mold portion 18). By molding the stator 16 with synthetic resin in this way, the drive coil 161 and the like, which are electrical members, are protected, and the occurrence of corrosion and short circuits due to moisture is prevented.

  Here, as a synthetic resin which comprises the mold part 18, it is preferable that it is a thermosetting resin which is excellent in a shaping | molding precision rather than a thermoplastic resin. In addition, the thermosetting resin here includes a material mainly composed of a thermosetting resin. As a specific suitable material, BMC (Bulk Mold Compound) mixed with glass fiber or the like in unsaturated polyester can be exemplified.

  A through hole 181 through which the output shaft 14 of the rotor 12 is inserted is formed in the center of the mold part 18. Further, a counter-output side recess 182 that communicates with the through hole 181 and has a larger diameter than the through hole 181 is formed on the counter output side of the mold part 18. A non-output-side bearing 192 (radial bearing) that rotatably supports the non-output-side end of the output shaft 14 is fixed to the counter-output-side recess 182 by press-fitting. On the other hand, an output side recess 183 communicating with the through hole 181 is formed on the output side of the mold part 18. The output-side recess 183 has a larger diameter than the through-hole 181 and includes a relatively small-diameter small-diameter recess 183a and a relatively large-diameter large-diameter recess 183b (corresponding to the recess in the present invention). . An output side bearing 193 (radial bearing) that rotatably supports the output shaft 14 slightly from the output side is fixed to the small-diameter recess 183a by press-fitting. That is, the output shaft 14, that is, the rotor 12 is supported by the non-output side bearing 192 and the output side bearing 193 so as to be rotatable about the axis of the stator 16.

  Further, the seal member 40 is fixed to the large-diameter recess 183b of the output-side recess 183 by press-fitting. Details of the structure and function of the seal member 40 will be described later.

  The impeller 20 includes a cylindrical portion 22 and a blade portion 24, and is fixed to one end of the output shaft 14 of the motor 10. Specifically, the end portion of the output shaft 14 is knurled, and the knurled portion is press-fitted into a shaft fixing hole 221 formed in the cylindrical portion 22 of the impeller 20. The fixing method is an example and can be changed as appropriate. However, since the impeller 20 functions as a position restricting member in the axial direction of the output shaft 14 as described later, the impeller 20 does not rattle with respect to the output shaft 14. It is necessary to ensure sufficient fixing strength. For example, a configuration in which the output shaft 14 is fixed by a connecting member such as a bolt is more preferable.

  The motor 10 and the impeller 20 having such a configuration are housed in a case 30. The case 30 is formed by assembling a bottom lid 32, a pipe 33, an impeller case 34, and an upper lid 35 with respect to the case body 31, and a motor chamber 38, which is a space in which the motor 10 is accommodated, Fluid in the impeller chamber 39, which is a space in which the impeller 20 is stored, the flow path 5 of the fluid to be transferred, and the self-priming process (step of discharging air in the pump device 1 and the hose; refer to the operation description described later). A gas-liquid separation chamber 50 that separates the gas and the gas is configured.

  Specifically, the outer wall of the case 30 is configured by assembling the bottom lid 32 and the top lid 35 to the case body 31. The bottom cover 32 is connected to the case body 31 by, for example, a bolt or the like through an O-ring 90 for preventing water leakage. The upper lid 35 is fixed by the claw portion 351 being locked in the locking hole 311 of the case body 31. Thus, by fixing the upper lid 35 to the case main body 31, a motor chamber 38, which is a space in which the motor 10 is stored, is configured.

  Further, a suction port 312 for drawing the fluid to be transferred into the pump device 1 is formed in the upper portion of the case body 31, and the pipe 33 is connected via an O-ring 91 so as to communicate with the suction port 312. ing. The pipe 33 is a substantially L-shaped cylindrical member having a check valve 331. An impeller case 34 is connected to the opposite side of the pipe 33 connected to the suction port 312 so as to be fitted to the outside of the pipe 33. The impeller case 34 is connected to the case body 31 such that the opposite side connected to the pipe 33 is fitted to the outside of the impeller chamber side wall 313 of the case body 31. The pipe 33 and the impeller case 34 form a flow path 5 for the fluid drawn into the pump device 1. Thus, the impeller chamber 39, which is a space in which the impeller 20 is accommodated, is configured by the case body 31 and the impeller case 34.

  Hereinafter, specific configurations in the motor chamber 38 and the impeller chamber 39 will be described.

  FIG. 3 is an enlarged view of the seal member 40 housed in the motor chamber 38 and the impeller 20 housed in the impeller chamber 39 (enlarged view of portion A in FIG. 1). The seal member 40 is a synthetic resin member that serves to prevent fluid from entering the motor chamber 38 from the impeller chamber 39 formed in the case 30, and is formed inside the cylindrical portion 41 and the cylindrical portion 41. And two lips 42 and 43 arranged in the axial direction. As described above, the seal member 40 is fixed to the large-diameter recess 183b of the output-side recess 183 formed in the mold portion 18 by press-fitting while the cylindrical portion 41 is elastically deformed. Specifically, to the position where the non-output-side end surface 401 of the seal member 40 abuts on a step (the bottom surface of the large-diameter recess 183b) existing at the boundary between the small-diameter recess 183a and the large-diameter recess 183b of the output-side recess 183. Press fit.

  The lips 42 and 43 of the seal member 40 thus fixed are in contact with the outer peripheral surface of the output shaft 14 rotatably supported by the non-output side bearing 192 and the output side bearing 193. That is, during the operation of the apparatus, the lips 42 and 43 are in sliding contact with the rotating output shaft 14. As a result, the fluid transferred by the rotation of the impeller 20 is prevented from entering the motor chamber 38 from the impeller chamber 39 and water leakage to the outside of the apparatus through the motor chamber 38 is prevented. More precisely, since the seal member 40 is provided in the motor chamber 38, the lips 42 and 43 of the seal member 40 are the output shaft 14, and the cylindrical portion 41 of the seal member 40 is the large-diameter recess 183b of the output-side recess 183. The fluid can enter up to the position where it abuts. That is, the fluid enters the large-diameter recess 183b in the motor chamber 38, and the seal member 40 prevents the fluid from entering from the small-diameter recess 183a of the output-side recess 183 (from the axial direction). In other words, in the present embodiment, “intrusion of fluid into the motor chamber 38 is prevented” excludes the large-diameter recess 183 b of the output-side recess 183 in the motor chamber 38 (that is, the space in which the seal member 40 is disposed). This means that the intrusion of fluid into the part is prevented.

  On the other hand, as shown in FIGS. 2 and 3, the case main body 31 is provided with a convex portion 395 projecting in a cylindrical shape from the center of the bottom surface (lower surface) of the motor chamber 38, and at the center of the convex portion 395. Is formed with a through-hole 382 through which the output shaft 14 is inserted. Further, an annular projecting portion 383 projecting in an annular shape is formed around the convex portion 395. The stator 16 (mold part 18) is positioned and fixed to the annular projecting part 383.

  This point will be specifically described with reference to FIG. 3 and FIG. 4 (enlarged view of portion B in FIG. 3). A first wall portion 184 that is an annular protrusion and a second wall portion 185 provided outside the first wall portion 184 are formed on the opposite side of the mold portion 18 of the stator 16. ing. The stator 16 is positioned and fixed in the motor chamber 38 so that the annular protrusion 383 is fitted between the first wall 184 and the second wall 185. When the stator 16 is positioned and fixed with respect to the case body 31, an O-ring 92 is interposed between the case body 31 and the mold portion 18.

  Specifically, the first wall portion 184 positioned relatively inside includes a large-diameter wall portion 184a having a relatively large diameter up to the outer peripheral surface and a relatively small-diameter wall portion 184b. The O-ring 92 is sandwiched between the first wall portion 184 and the annular projecting portion 383 using a step generated at the boundary between them. That is, the O-ring 92 is sandwiched between the small-diameter wall portion 184 b of the first wall portion 184 and the annular projecting portion 383. This prevents fluid from entering the motor chamber 38 (outside of the stator 16) from the radial direction of the large-diameter recess 183b. Further, the annular projecting portion 383 is fitted (press-fitted) between the large-diameter wall portion 184 a of the first wall portion 184 and the second wall portion 185.

  With such a configuration, in the pump device 1, the fluid is prevented from entering from the axial direction of the output shaft 14 by the seal member 40, and the O-ring 92 enters the motor chamber 38 from the radial direction of the large-diameter recess 183 b. Intrusion of fluid is prevented. Therefore, the intrusion of fluid into the motor chamber 38 is prevented, and failure or corrosion due to water wetting of the rotor 12 or the stator 16 is surely prevented. Further, water leakage to the outside of the pump device 1 via the motor chamber 38 is reliably prevented.

  As can be seen from FIGS. 1 and 3, the convex portion 395 protruding in a cylindrical shape from the center of the bottom surface of the motor chamber 38 enters the large-diameter concave portion 183 b and is positioned. That is, the opening of the large-diameter concave portion 183 b is covered with the convex portion 395 that is the outer wall of the impeller chamber 39.

  The output shaft 14 of the motor 10 disposed in the motor chamber 38 passes through a through hole 382 formed in the convex portion 395, and a tip portion of the output shaft 14 protrudes from the motor chamber 38 and is located in the impeller chamber 39. The impeller 20 is fixed to the tip portion of the output shaft 14 and is accommodated in the impeller chamber 39. Specifically, as shown in FIG. 3, the cylindrical portion 22 of the impeller 20 is formed in a concave space 391 born in the impeller chamber 39 by a convex portion 395 protruding in a cylindrical shape from the center of the bottom surface of the motor chamber 38. The counter-output side end surface 222 of the cylindrical portion 22 faces the bottom portion 391a of the concave space 391 with a predetermined clearance. That is, the output shaft 14 is fixed with play so that it can move up and down to some extent in the axial direction. This is because if there is no such play, assembly may be difficult due to manufacturing errors of each component. Further, the blade portion 24 is located in the main space 392 of the impeller chamber 39 formed larger than the turning diameter thereof.

  FIG. 5 is a cross-sectional view (cross-sectional view taken along the line CC in FIG. 1) in which the blade portion 24 of the impeller 20 is cut in a direction orthogonal to the axial direction. FIG. 6 is a cross-sectional view (cross-sectional view taken along the line DD in FIG. 1) in which the part below the blade portion 24 of the impeller 20 is cut in a direction orthogonal to the axial direction. As shown in FIG. 5, two discharge ports 313 a are formed in the side wall 313 of the impeller chamber 39. Thereby, the fluid drawn into the impeller chamber 39 from the suction port 394 by the rotation of the impeller 20 is pushed out to the gas-liquid separation chamber 50 through the discharge port 313a by the rotational centrifugal force of the impeller 20.

  As shown in FIG. 6, a return port 313 b is formed in the side wall 313 of the main space 392 of the impeller chamber 39. The return port 313 b communicates with the lower part of the gas-liquid separation chamber 50, and serves as a flow path for returning the fluid once pushed into the gas-liquid separation chamber 50 by the rotation of the impeller 20 to the impeller chamber 39 again. Therefore, the return port 313b is provided below the blade portion 24 of the impeller 20 where negative pressure is generated so that the fluid is drawn from the gas-liquid separation chamber 50 into the impeller chamber 39 by the rotation of the impeller 20.

  The gas-liquid separation chamber 50 in which the fluid pushed out by the impeller 20 moves occupies most of the internal space of the case 30. Specifically, a portion of the internal space of the case 30 excluding the motor chamber 38, the impeller chamber 39, and the fluid flow path 5 constituted by the pipe 33 and the impeller case 34 is a gas-liquid separation chamber 50. As shown in FIG. 2, the gas-liquid separation chamber 50 (case main body 31) has an upper portion for discharging air separated in communication with the gas-liquid separation chamber 50 in the self-priming process to the outside, and for self-priming. A discharge port 51 is provided for discharging water after completion of the process to the outside. A priming water supply port 52 for introducing a predetermined amount of priming water into the case 30 in advance is provided alongside the discharge port 51.

  Hereinafter, the operation of the pump device 1 configured as described above will be described. First, in the internal space of the case 30, priming water is supplied from the priming water supply port 52 so that at least all of the blade portions 24 of the impeller 20 are immersed so that the impeller 20 does not idle.

  After supplying a predetermined amount of priming water, power is supplied to the drive coil 161 of the stator 16 of the motor 10. Then, a magnetic field is generated from the stator 16 including the drive coil 161, and the rotor 12 including the magnet 121 positioned outside the stator 16 rotates. When the rotor 12 rotates, the impeller 20 fixed to the tip of the output shaft 14 of the rotor 12 rotates in the impeller chamber 39.

  Due to the rotation of the impeller 20, the priming water existing in the main space 392 of the impeller chamber 39 is pushed out from the two discharge ports 313 a formed in the side wall 313 to the gas-liquid separation chamber 50, and the impeller chamber 39 is negatively charged. Become pressure. Then, the check valve 331 provided in the pipe 33 is opened, one is connected to the suction port 312 and the other is connected to the fluid source (for example, when the remaining hot water in the bath is drawn into the washing machine, The air that was present inside the hose (which has been dropped into the water of the bath that is the fluid source) is drawn into the case 30. The air taken into the case 30 is sucked into the impeller chamber 39 from the suction port 394 through the fluid flow path 5 formed by the pipe 33 and the impeller case 34. Then, the impeller 20 is mixed while being stirred with priming water by the rotation of the impeller 20, and is pushed out from the impeller chamber 39 through the discharge port 313 a to the gas-liquid separation chamber 50.

  The extruded fluid (gas-liquid mixture) rises in a “vertical vortex” state while swirling around the pipe 33 penetrating the gas-liquid separation chamber 50 in the vertical direction. Therefore, the center position of the “longitudinal vortex” due to the flow of the fluid becomes a vacuum, the priming water is drawn to the vacuum portion, and air and water are easily separated. That is, the gas-liquid mixture is vigorously stirred in the gas-liquid separation chamber 50, but the flow forms a “vertical vortex”, so that the gas-liquid mixture rises compared to the “lateral vortex”. It takes time. As a result, the gas-liquid mixture is separated into air and water by the time it reaches the upper part of the gas-liquid separation chamber 50, and light air of mass is accumulated in the upper part of the gas-liquid separation chamber 50. Therefore, the separated air is gradually discharged from the discharge port 51.

  On the other hand, heavy water moves to the lower part of the gas-liquid separation chamber 50 and is drawn into the impeller chamber 39 from the return port 313b formed in the side wall 313. Then, after being mixed with air again, it is pushed out to the gas-liquid separation chamber 50.

  By repeating such an operation, only the air existing in the case 30 or the hose is gradually discharged from the discharge port 51. As air is exhausted, water is gradually drawn from the fluid source. When the air is completely discharged and the case 30 and the hose are filled with water, the self-priming operation state is in a steady water supply operation state (the state in which liquid is transferred. The remaining hot water in the bath is drawn into the washing machine. In this case, the water in the bath is being transferred into the washing tub.), And the water drawn into the apparatus from the suction port 312 is continuously discharged from the discharge port 51.

  After the water supply operation is completed, when the power supply to the motor 10 is stopped and the rotation of the impeller 20 is stopped, the negative pressure in the impeller chamber 39 disappears. Then, the action of drawing the fluid into the case 30 is lost, and the fluid tries to flow backward, but the check valve 331 provided in the pipe 33 blocks the fluid flow path 5, so that the fluid does not flow backward.

  As mentioned above, although the structure and operation | movement of the pump apparatus 1 which concern on this embodiment were demonstrated, according to the pump apparatus 1 provided with this structure, there exist the following effects.

  During operation of the pump device 1 operating as described above, the fluid pressure in the impeller chamber 39 varies in various ways. For this reason, the output shaft 14 to which the impeller 20 disposed so as to be able to move up and down slightly in the axial direction is fixed is moved up and down by the amount of the play due to the pressure change in the impeller chamber 39. In the present embodiment, the counter-output side end face 222 of the cylindrical portion 22 of the impeller 20 shown in FIG. 3 and the inner wall of the impeller chamber 39 (the bottom portion 391a of the concave space 391) contact each other to move upward. The position of the output shaft 14 is restricted. That is, even if the output shaft 14 moves up and down in the axial direction, the impeller 20 and the inner wall of the impeller chamber 39 are in contact with each other in the impeller chamber 39 that is always filled with fluid (gas-liquid mixture). Both impingement sounds are reduced by the fluid flowing in the impeller chamber 39, and the pump device 1 having excellent silence can be obtained.

  Further, the convex portion 395 formed in the case main body 31 and projecting in a cylindrical shape from the center of the bottom surface of the motor chamber 38 is located in the large-diameter concave portion 183b to which the seal member 40 is fixed. That is, the opening side of the large-diameter concave portion 183 b is covered with the convex portion 395 that is the outer wall of the impeller chamber 39. In this way, by adopting a configuration in which the opening of the large-diameter recess 183b is closed by the protrusion 395, the seal member 40 fixed to the large-diameter recess 183b by press-fitting is prevented from falling off.

  From the viewpoint of obtaining such an effect of preventing the sealing member 40 from falling off, the size of the convex portion 395 is not particularly limited. In other words, as long as at least a part of the opening of the large-diameter recess 183b is covered with the protrusion 395, the seal member 40 does not fall off the large-diameter recess 183b.

  The pump device 1 according to the present embodiment is a so-called self-priming pump device that can separate air in the flow path at the start of operation, and includes a gas-liquid separation chamber 50. In this embodiment, the gas-liquid separation chamber 50 is configured in the case 30 together with the motor chamber 38 in which the motor 10 is accommodated and the impeller chamber 39 in which the impeller is accommodated. It can be suppressed.

  Further, the non-output-side bearing 192 and the output-side bearing 193 that rotatably support the output shaft 14 of the motor 10 are respectively provided with an anti-output-side recess 182 and an output-side recess 183 (small-diameter recess 183a) of the mold portion 18 that covers the stator 16. ) By press fitting. The seal member 40 that is in sliding contact with the output shaft 14 is fixed to the output-side recess 183 (large-diameter recess 183b) of the mold portion 18 by press-fitting. That is, since all of the non-output-side bearing 192, the output-side bearing 193, and the seal member 40 are fixed to the mold portion 18, these members can be disposed with high coaxiality. As a result, high coaxiality between the output shaft 14 supported by the non-output side bearing 192 and the output side bearing 193 and the seal member 40 slidably in contact with the output shaft 14 can be ensured. It can be set as the pump apparatus 1 which has performance.

  In addition, as a fixing method of the non-output side bearing 192, the output side bearing 193, and the seal member 40, a method other than press-fitting can be employed. However, in order to ensure the high coaxiality of these members, it is necessary to reduce the variation in the fixing position of each member with respect to the mold portion 18 (in the counter-output-side recess 182 and the output-side recess 183, these Therefore, the fixing method by press-fitting as in this embodiment is most suitable. In some cases, an adhesive or the like may be used to improve the fixing strength by press-fitting.

  Moreover, in this embodiment, since the mold part 18 which covers the stator 16 is formed with the thermosetting resin, the dimensional accuracy of the mold part 18 which is a molded product is high. Therefore, since the fixing position accuracy of the non-output side bearing 192, the output side bearing 193, and the seal member 40 fixed to the mold portion 18 is also improved, the sealing performance of the seal member 40 that is in sliding contact with the output shaft 14 is further improved.

  In the pump device 1, an O-ring 92 is provided between the annular projecting portion 383 formed on the case body 31 and the small-diameter wall portion 184 b of the first wall portion 184 formed on the mold portion 18 that covers the stator 16. By being pinched, the intrusion of fluid into the motor chamber 38 from the radial direction of the large-diameter concave portion 183b and water leakage to the outside of the apparatus via the motor chamber 38 are prevented. And when this case main body 31 and the mold part 18 are fitted, since the cyclic | annular protrusion part 383 is guided by the 2nd wall part 185, it fits in the state which the mold part 18 inclined with respect to the case main body 31 There is nothing like that. That is, since the O-ring 92 can be securely stored in a predetermined position, the sealing structure by the mold part 18 and the case body 31 has high reliability.

  In the present embodiment, the annular projecting portion 383 provided on the case body 31 is fitted between the first wall portion 184 and the second wall portion 185 provided on the mold portion 18. As described above, the opposite, that is, the annular protrusion provided in the mold part 18 is fitted between the first wall part and the second wall part provided in the case body 31. It is good.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 10 Motor 14 Output shaft 16 Stator 18 Mold part 182 Non-output side recessed part 183 Output side recessed part 192 Non-output side bearing 193 Output side bearing 20 Impeller 30 Case 38 Motor room 39 Impeller room 40 Seal member 50 Gas-liquid separation room

Claims (5)

A motor,
An impeller fixed to one end of the output shaft of the motor;
A motor chamber in which the motor is housed, and a case in which the impeller chamber is housed and serves as a flow path for fluid that is transferred by rotation of the impeller;
A seal member that contacts the output shaft and prevents fluid from entering the motor chamber from the impeller chamber;
The case includes a convex portion protruding in a cylindrical shape from the center of the bottom surface of the motor chamber, and a concave space is formed in the impeller chamber by the convex portion,
The seal member is provided in the motor chamber so as to be located on the opposite output side of the convex portion,
The impeller includes a blade portion and a cylindrical portion that protrudes from the blade portion to the opposite output side and is located in the concave space.
The output shaft is provided so as to be movable by a predetermined amount in the axial direction, and one end thereof is fixed to the cylindrical portion,
The pump device characterized in that the movement of the output shaft in the axial direction is restricted by the bottom of the concave space facing the counter-output end surface that is the end surface on the counter-output side of the cylindrical portion . The case is
A case body that constitutes the motor chamber and is formed with the convex portion;
An impeller case constituting the impeller chamber together with the case body;
Including
A through hole through which the output shaft passes is formed in the center of the convex portion,
The seal member is disposed in the motor chamber so as to sandwich a bottom portion of the concave space between the cylindrical portion located in the concave space formed by the convex portion. The pump device according to claim 1 . The stator of the motor is molded with resin, and the seal member is fixed to a recess formed in the resin portion, and the opening of the recess is partially or entirely covered by the outer wall of the impeller chamber. The pump device according to claim 2 , wherein the pump device is provided. The pump device according to claim 3 , wherein the convex portion closes an opening of the concave portion by entering and positioning in the concave portion. 5. The gas-liquid separation chamber for separating the fluid discharged from the impeller chamber into a liquid and a gas is provided in the case. 6. Pump device.

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