JP2005069115A - Pipe connection structure of pump and pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connection structure in which a pipe connection operation is easily performed and liquid leakage or the like does not occur in a connection part, and to provide a pump device using the pipe connection structure. <P>SOLUTION: In this pipe connection structure of the pump in which pipes 42 and 50 are respectively connected to a suction nozzle 32 and a delivery nozzle 33 of a pump casing 14 having the suction nozzle 32 and the delivery nozzle 33, sockets 37 and 46 to which one end of the pipe 42 and one end of the pipe 50 are respectively connected are coupled to the nozzles 32 and 33, respectively. The nozzles 32 and 33 respectively have flange parts 34 and 43 of large diameter and respectively have projecting parts 35 and 44 of small diameter. The sockets 37 and 46 respectively have flange parts 38 and 47 abutting on the flanges 34 and 43, and a nozzle fitting holes 39 and 48. Seal members 36 and 45 are respectively fitted to outer peripheries of the projecting parts 35 and 44 of the respective nozzles, the projecting parts of the nozzles 32 and 33 are fitted in the fitting holes 39 and 48 of the sockets 37 and 46, respectively, and the flange parts 34 and 38, and the flange parts 43 and 47 are fastened by a fastener in a state in which the flange parts 34 and 38 abutting on each other and the flange parts 43 and 47 abutting on each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump pipe connection structure for connecting pipes to suction and discharge nozzles of a pump casing and a pump device using the pipe connection structure.

  Currently, motor pumps that are about the size of a human fist are mounted and used in various devices. This type of pump often has a resin pump casing, and the suction / discharge nozzle of the pump casing is formed in a so-called “bamboo shoot” shape, and is often used by inserting a hose therein. However, the work of inserting the hose and performing the locking treatment with a hose hand or the like is time-consuming, and if the work is not performed carefully, the corresponding part may be loosened and “liquid leakage” may occur.

JP 2002-138990 A

  As described above, the connection method in which the hose is inserted into the suction / discharge nozzle of the conventional pump casing and tightened and fixed with a hose hand etc. not only takes time and labor for the connection work, but also the tightening part is loosened, causing `` liquid leakage ''. There was a problem that it might occur. The present invention solves such a problem, and provides a highly reliable pump pipe connection structure in which pipe connection work is easy and liquid leakage or the like does not occur in the connection part, and a pump device using the pipe connection structure. For the purpose.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a pump pipe connection structure in which a pipe is connected to the nozzle of a pump casing having suction and discharge nozzles, and one end of the pipe is connected to the nozzle in the pipe connection structure. The socket is configured to be coupled, the nozzle has a large-diameter flange and a small-diameter protrusion protruding from the flange, and the socket has a nozzle that contacts the flange of the nozzle and the center of the flange. The seal member is fitted to the outer periphery of the nozzle protrusion or the inner periphery of the socket hole, the nozzle protrusion is inserted into the socket insertion hole, and both flanges are The both collars are fastened with a stopper in a state of being in contact with each other.

  The invention described in claim 2 is a pump pipe connection structure in which a pipe is connected to the nozzle of a pump casing having suction and discharge nozzles, and the pipe connection structure is combined with a socket in which one end of the pipe is connected to the nozzle. The nozzle has a large-diameter collar part and a fitting hole into which the protruding part of the socket is fitted in the center part of the collar part, and the socket has a collar part that contacts the collar part of the nozzle and the collar part. A small-diameter protruding portion protruding from the nozzle, and a seal member is mounted on the inner periphery of the nozzle insertion hole or the outer periphery of the socket protruding portion, and the protruding portion of the socket is inserted into the nozzle insertion hole and both flanges It is characterized by comprising a stopper that fastens the flanges in a state where the two are in contact with each other.

  According to a third aspect of the present invention, in the pump device comprising the pump and connected to the suction and discharge nozzles of the casing of the pump, the pipe connection structure for connecting the pipe to the nozzle is the first or second aspect. It uses the piping connection structure of the pump described in 1.

  According to the first aspect of the present invention, it is possible to insert the protrusion of the nozzle into the insertion hole of the socket, and fasten the two flanges that are in contact with each other with the stoppers. Due to the action of the seal member attached to the outer periphery or the inner periphery of the socket insertion hole, liquid leakage does not occur, and both hooks are fastened with a stopper, so mechanical connection is ensured and highly reliable pump piping Connection structure can be provided.

  According to the second aspect of the present invention, in the simple pipe connection work of inserting the protruding portion of the socket into the insertion hole of the nozzle and fastening the both flanges that are in contact with each other with the stopper, Due to the action of the seal member attached to the inner periphery or the outer periphery of the protruding part of the socket, no leakage of liquid occurs, and both flanges are fastened with a stopper, so mechanical connection is ensured and highly reliable pump piping Connection structure can be provided.

  According to the invention described in claim 3, since the pipe connection structure according to claim 1 or 2 is used for the pipe connection structure for connecting the pipe to the nozzle, a highly reliable pipe connection structure is provided. A pump device can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a configuration example of a pump according to the present invention. This pump is a single-stage centrifugal motor pump having a specific speed Ns (m ³ / min, m, min ⁻¹ ) at the maximum efficiency point flow rate of 160, for example, and the outer diameter of the impeller is 20 mm, for example. The maximum wetting edge diameter of the child is 10 mm, the radial gap δ formed outside the maximum wetting edge outer diameter of the motor rotor is 1 mm, and the axial length of the maximum wetting edge diameter portion of the motor rotor is 25 mm.

  This pump includes a motor unit 1 and a pump unit 2. The motor unit 1 is a so-called DC brushless motor, and structurally falls within the category of a canned motor. The motor stator 11 is accommodated in a motor frame 12 made of cup-shaped aluminum die casting. A cup-shaped rotor casing 13 is provided on the inner peripheral side of the motor stator 11, and a flange 13 b is sandwiched between the motor frame 12 and a resin pump casing 14. The rotor casing 13 is made of PP (polypropylene), and insert molding is performed so that a bearing 41 made of PEEK (polyether ether ketone) manufactured in advance by injection molding is covered with the rotor casing 13 made of PP. Since PEEK has a higher molding temperature than PP, there is no inconvenience of thermal deformation during insert molding. Furthermore, it is not necessary to perform alignment with a rotation stop at the time of press-fitting, and labor can be saved. The bearing bracket 15 is also made of PEEK and insert-molded so as to be covered with the rotor casing 13. A bearing bracket 15 is sandwiched between the rotor casing 13 and the pump casing 14, and a part of the bearing bracket 15 functions as a load-side radial bearing and a thrust bearing.

  In the motor rotor 17, a neodymium permanent magnet 19 is provided on the outer periphery of a metal magnetic yoke 18, and a cup-shaped rotor outer cover 20 and the rotor are disposed so as to surround the yoke 18 and the permanent magnet 19. An inner cover 21 is provided and sealed with seal members 22 and 23 such as O-rings. By adopting such a configuration, the permanent magnet 19 and the magnetic yoke 18 are completely cut off from the pump-handed liquid, so that rust does not occur. A main shaft 24 is inserted into the shaft core portion of the motor rotor 17. The main shaft 24 is made of an austenitic stainless alloy and has a diameter of about 1.5 mm, for example, and shaft sleeves 25 and 26 are attached to both ends. Reference numeral 28 denotes a retaining ring that stops the movement of the rotor outer cover 20 in the axial direction.

  A closed type (equipped with a front shroud) impeller 27 of the centrifugal pump unit 2 is attached to one end of the main shaft 24. The impeller 27 has a diameter of 20 mm, for example, and a hole (main shaft through hole) through which the main shaft 24 of the impeller 27 passes can be inserted on the suction mouse side of the impeller 27 by, for example, a shaft sleeve 25 having a diameter of about 3.5 mm. Yes. In order to prevent the shaft sleeve 25 from rotating relative to the impeller 27, for example, with respect to a diameter of about 3.5 mm, the main shaft through hole of the impeller 27 and a part of the shaft sleeve 25 are chamfered (distance between the two surfaces is about 3 mm). To do. The impeller 27 is manufactured by injection molding a resin material such as PPS (polyphenylene sulfide), and the shaft sleeves 25 and 26 are manufactured by a ceramic material such as alumina.

  The shaft sleeves 25 and 26 are prevented from rotating with respect to the main shaft 24 of the motor rotor 17 by, for example, chamfering the main shaft through hole of the motor rotor 17 and part of the shaft sleeves 25 and 26 with respect to a diameter of about 3.5 mm. The distance between the two surfaces is about 3 mm). The outer diameter portion of the shaft sleeve 26 forms a sliding surface with the inner diameter of the bearing portion of the bearing bracket 15. Thrust disks 16 and 16 are sandwiched between the rotor inner cover 21 and the shaft sleeve 25 and between the impeller 27 and the shaft sleeve 25 of the motor rotor 17. The thrust disks 16 and 16 are secured to the shaft sleeve 25 in the same manner as the shaft sleeves 25 and 26 are prevented from rotating with respect to the main shaft 24, and slide between the axial end surfaces of the bearing portions of the bearing bracket 15. Bearing thrust load. A portion corresponding to the shaft sleeve 26 at the end of the main shaft 24 on the counter pump side of the rotor casing 13 is provided integrally with the rotor casing 13 to support a load in the radial direction.

  A T-shaped forged portion 24a forged into a T shape is formed at the end of the main shaft 24 on the impeller 27 side, and an impeller 27 is attached by attaching an E-shaped retaining ring 29 to the end of the opposite impeller. Such a member does not fall off from the main shaft 24. This fixing means does not tighten the member in the axial direction like a screw, but simply restricts the movement of the member in the axial direction. The present invention has a structure in which there is no problem even if there is some gap or play in the axial direction between the members, and these simple fixing means can be used. Therefore, productivity is also good.

  Further, if an element (not shown) such as a coil spring is sandwiched between the fixing means (E-shaped retaining ring 29) and the shaft sleeve 26, the fixing means (T-shaped) of the shaft end portions 24a and 24b of the main shaft 24 is obtained. Since the member sandwiched between the forged molded portion 24a and the E-shaped retaining ring 29) does not move while generating a rattling noise, no noise is generated. In addition, since the groove | channel is provided in the boss | hub part end surface of the impeller 27 corresponding to the T-shaped forge molding part 24a of the edge part at the side of the impeller 27 of the main shaft 24, it is transmitted to the impeller 27 from the shaft sleeve 25. The rotating torque transmitted to the main shaft 24 is also transmitted.

  The pump casing 14 has a cup shape and is formed of a resin material such as PPS. A suction nozzle 32 is provided on the cup-shaped bottom of the pump casing 14, and a discharge nozzle 33 is provided on the side surface. Further, the inner surface of the cup-shaped open portion of the pump casing 14 is fixed to the outer peripheral portion of the rotor casing 13 via a seal member 30 such as an O-ring to constitute a sealed container. Further, a fluororesin liner ring 31 is provided at the cup-shaped bottom portion of the pump casing 14 to form a minute gap with the outer peripheral portion of the suction mouth of the impeller 27. The pump casing 14 and the motor frame 12 are fixed with bolts with the rotor casing 13 interposed therebetween.

  A large-diameter flange 34 and a small-diameter protrusion 35 protruding from the flange 34 are formed on the outer periphery of the suction nozzle 32 of the pump casing 14, and a seal member 36 such as an O-ring is formed on the outer periphery of the protrusion 35. It is installed. A socket 37 is coupled to the suction nozzle 32. The socket 37 has a large-diameter flange 38 that contacts the flange 34 of the suction nozzle 32 and a fitting hole 39 into which the protrusion 35 of the suction nozzle 32 is fitted in the center of the flange 38. The protruding portion 35 of the suction nozzle 32 is inserted into the insertion hole 39 of the socket 37, and both the flange portions 34 and 38 are fixed to the stopper 40 in a state where the flange portion 34 of the suction nozzle 32 and the flange portion 38 of the socket 37 are in contact with each other. Conclude with. Note that one end of a pipe 42 for supplying pump handling liquid is connected to the end of the socket 37.

  In the pipe connection structure for connecting the pipe 42 to the suction nozzle 32 of the pump unit 2, the protrusion 35 of the suction nozzle 32 is fitted into the fitting hole 39 of the socket 37 as described above, and the flange 34 and the socket of the suction nozzle 32 are inserted. By adopting a configuration in which both flange portions 34, 38 are fastened with a stopper 40 in a state where the flange portions 38 of 37 are in contact with each other, liquid leakage does not occur due to the action of the seal member 36 such as an O-ring, Since both the flange portions 34 and 38 are fastened to each other by the stopper 40, the mechanical strength of the connection is high and the pipe connection work is facilitated. The seal member 36 such as an O-ring may be attached to the inner periphery of the insertion hole 39 of the socket 37.

  A large-diameter flange 43 and a small-diameter protrusion 44 protruding from the flange 43 are formed on the outer periphery of the discharge nozzle 33 of the pump casing 14, and a seal member 45 such as an O-ring is formed on the outer periphery of the protrusion 44. It is installed. A socket 46 is coupled to the discharge nozzle 33. The socket 46 is configured to have a flange 47 that contacts the flange 43 of the discharge nozzle 33 and a fitting hole 48 into which the protrusion 44 of the discharge nozzle 33 is fitted in the center of the flange 47. The protruding portion 44 of the discharge nozzle 33 is inserted into the insertion hole 48 of the socket 46, and both the flange portions 43 and 47 are fixed to the stopper 49 in a state where the flange portion 43 of the discharge nozzle 33 and the flange portion 47 of the socket 46 are in contact with each other. Fasten with each other. Note that one end of a pipe 50 for discharging the handling liquid is connected to the end of the socket 46.

  In the pipe connection structure for connecting the pipe 50 to the discharge nozzle 33 of the pump unit 2, the protrusion 44 of the discharge nozzle 33 is fitted into the fitting hole 48 of the socket 46 as described above, and the flange 43 and the socket of the discharge nozzle 33 are inserted. By adopting a configuration in which both flange portions 43 and 47 are fastened with a stopper 49 while the flange portions 47 of 46 are in contact with each other, liquid leakage does not occur due to the action of the seal member 45 such as an O-ring. Since both the flanges 43 and 47 are fastened to each other by the stopper 49, the mechanical strength of the connection is high and the pipe connection work is facilitated. The sealing member 45 such as an O-ring may be attached to the inner periphery of the insertion hole 48 of the socket 46.

  The handling liquid sucked from the suction nozzle 32 of the pump casing 14 through the pipe 42 whose end is connected to the socket 37 is guided into the impeller 27 from the suction mouse of the impeller 27, and as the impeller 27 rotates. The pressure is increased, and the liquid is discharged through the discharge passage of the pump casing 14, the discharge nozzle 33, and one end through a pipe connected to the socket 46. A part of the handling liquid is introduced into the rotor casing 13 and used for lubricating the bearing portion and cooling the motor portion 1. As described above, the present invention has a radial gap δ formed outside the maximum diameter of the wet edge of the motor rotor 17 of 1 mm, which is larger than that of a general canned motor. It is supplied to the sliding surface of the bearing without being affected by the viscosity of the handling liquid. As a result, since there is no need to provide a through hole in the main shaft 24, the thickness of the main shaft 24 can be designed to be narrow to its strength limit.

  In the pump according to the present invention, the plain bearing for supporting the main shaft 24 is configured by utilizing the shaft sleeves 25 and 26 as described above, so that it is substantially unnecessary to secure the strength against “torsion”. The shaft diameter can be set to a very small value because it is only necessary to ensure the strength against “and pull”. As a result, the boss diameter of the impeller 27 is kept small, and the ratio of the suction mouse diameter of the impeller 27 to the outer diameter of the impeller 27 can be optimized, so that the hydrodynamic efficiency of the impeller 27 is set to a good value. It becomes possible. Moreover, since the diameter of the motor rotor 17 can be suppressed to an extremely small value, the stirring loss accompanying the rotation of the motor rotor 17 can be reduced.

  Note that the outer peripheral portion of the PEEK bearing 41 is provided with a shape of “rotation stop” and “prevention of axial removal”. For this reason, for example, even when a pump is used with high-temperature liquid, there is a disadvantage that the bearing 41 rotates around the rotor casing 13 or the bearing bracket 15 due to a difference in linear expansion coefficient, or that the bearing 41 comes off in the axial direction. Absent.

  FIG. 2 is a sectional view showing another configuration example of the pump according to the present invention. In FIG. 2, the parts denoted by the same reference numerals as those in FIG. The tip of the suction nozzle 32 of the pump casing 14 is a large-diameter flange 51, and a fitting hole 52 into which a projection 55 of a socket 54 described later is fitted is formed at the center of the flange 51. A seal member 53 such as an O-ring is attached to the inner periphery of the insertion hole 52. A socket 54 is coupled to the suction nozzle 32. The socket 54 is configured to have a large-diameter flange 56 that contacts the flange 51 of the suction nozzle 32 and a small-diameter protrusion 55 that protrudes from the flange 56. The protruding portion 55 of the socket 54 is inserted into the insertion hole 52 of the suction nozzle 32, and both the flange portions 51 and 56 are fixed to the stopper 57 in a state where the flange portion 51 of the suction nozzle 32 and the flange portion 56 of the socket 54 are in contact with each other. Conclude with. Note that one end of a pipe 42 for supplying the handling liquid is connected to the end of the socket 54.

  In the pipe connection structure in which the pipe 42 is connected to the suction nozzle 32 of the pump unit 2, the protrusion 55 of the socket 54 is fitted into the fitting hole 52 of the suction nozzle 32 as described above, and the flange 51 and the socket of the suction nozzle 32 are inserted. By adopting a configuration in which both flange portions 51 and 56 are fastened with a stopper 57 in a state where the flange portions 56 of the 54 are in contact with each other, liquid leakage does not occur due to the action of the seal member 53 such as an O-ring. Since both the flange portions 51 and 56 are fastened by the stopper 57, the mechanical strength of the connection is high, and the pipe connection work is facilitated. Note that a sealing member 53 such as an O-ring may be mounted on the outer periphery of the protruding portion 55 of the socket 54.

  The tip of the discharge nozzle 33 of the pump casing 14 is a large-diameter flange portion 58, and a fitting hole 59 into which a projection 63 of a socket 61 described later is fitted is formed at the center portion of the flange portion 58. A seal member 60 such as an O-ring is attached to the inner periphery of the fitting hole 59. A socket 61 is coupled to the discharge nozzle 33. The socket 61 includes a large-diameter flange 62 that contacts the flange 58 of the discharge nozzle 33 and a small-diameter protrusion 63 that protrudes from the flange 62. The protrusion 63 of the socket 61 is inserted into the insertion hole 59 of the discharge nozzle 33, and both the flanges 51 and 56 are fixed to the stopper 57 in a state where the flange 58 of the discharge nozzle 33 and the flange 62 of the socket 61 are in contact with each other. Conclude with. Note that one end of a pipe 50 for discharging the handling liquid is connected to the end of the socket 61.

  In the pipe connection structure that connects the pipe 50 to the discharge nozzle 33 of the pump unit 2, the protrusion 63 of the socket 61 is fitted into the fitting hole 59 of the discharge nozzle 33 as described above, and the flange 58 and the socket of the discharge nozzle 33 are inserted. By adopting a configuration in which both flange portions 58 and 62 are fastened with a stopper 64 while the flange portions 62 of the 61 are in contact with each other, liquid leakage does not occur due to the action of the seal member 60 such as an O-ring. Since both the flange portions 58 and 62 are fastened by the stopper 64, the mechanical strength of the connection is high and the pipe connection work is facilitated. The sealing member 60 such as an O-ring may be attached to the outer periphery of the protruding portion 63 of the socket 61.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is sectional drawing which shows the structural example of the pump which concerns on this invention. (Example 1) It is sectional drawing which shows the structural example of the pump which concerns on this invention. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor part 2 Pump part 11 Motor stator 12 Motor frame 13 Rotor casing 14 Pump casing 15 Bearing bracket 16 Thrust disk 17 Motor rotor 18 Yoke 19 Permanent magnet 20 Rotor outer cover 21 Rotor inner cover 22 Seal member 23 Seal Member 24 Main shaft 25 Shaft sleeve 26 Shaft sleeve 27 Impeller 28 Retaining ring 29 E-type retaining ring 30 Seal member 31 Liner ring 32 Suction nozzle 33 Discharge nozzle 34 Gutter 35 Projection 36 Seal member 37 Socket 38 Gutter 39 Fitting hole 40 Stopper 41 Bearing 42 Piping 43 Groove 44 Projection 45 Seal member 46 Socket 47 Groove 48 Insertion hole 49 Stopper 50 Piping 51 Protrusion 52 Insertion hole 53 Seal member 54 Socket 55 Protrusion 56 Protrusion 57 Stopper 58 collar 59 fitting hole 60 seal member 61 socket 62 collar 63 projecting part 64 stopper

Claims (3)

In the pipe connection structure of the pump that connects the pipe to the nozzle of the pump casing having the suction and discharge nozzles,
The pipe connection structure is configured to combine a socket connecting one end of the pipe to the nozzle,
The nozzle has a large-diameter flange and a small-diameter protrusion protruding from the flange,
The socket has a flange portion that abuts the flange portion of the nozzle and a fitting hole into which the protruding portion of the nozzle is fitted in the central portion of the flange portion,
A seal member is attached to the outer periphery of the protruding portion of the nozzle or the inner periphery of the hole of the socket,
A pump connection structure for a pump, wherein the protruding portion of the nozzle is inserted into the insertion hole of the socket, and the both flange portions are fastened with a stopper while the both flange portions are in contact with each other. In the piping connection structure of the pump that connects the piping to the nozzle of the pump casing having the suction and discharge nozzles,
The pipe connection structure is configured to combine a socket that connects one end of the pipe to the nozzle,
The nozzle has a large-diameter flange portion and a fitting hole into which the protruding portion of the socket is fitted at the center portion of the flange portion,
The socket is configured to have a flange that contacts the flange of the nozzle and a small-diameter protrusion that protrudes from the flange.
A seal member is attached to the inner periphery of the insertion hole of the nozzle or the outer periphery of the protruding portion of the socket,
A pump connection structure for a pump, comprising: a stopper for fitting the projecting portion of the socket into the fitting hole of the nozzle and fastening the both collar portions in a state where both collar portions are in contact with each other. In a pump apparatus comprising a pump and having pipes connected to the suction and discharge nozzles of the casing of the pump,
3. A pump device using the pipe connection structure for a pump according to claim 1 or 2 as a pipe connection structure for connecting a pipe to the nozzle.

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