JP3117327U - Feed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid feed pump having a mechanism capable of exchanging a seal member with a simple operation and not causing a shaft misalignment between a rotor shaft and a motor shaft during reassembly.
A pump body 1 having a pump chamber 5 therein and fixed to a substrate 2, a bearing member 11 detachably connected to the pump body 1, a rotor shaft 6 held by the bearing member 11, A pump rotor 3 disposed in the pump chamber 5 and rotated by a rotor shaft 6, a seal member 12 disposed on a rotor shaft peripheral surface in the pump body 1, and a motor 14 for driving the pump rotor 3. The motor 14 is connected and held to the bearing member 11, and the rotor shaft 6 and the motor shaft 15 are detachably connected via a coupling 16, and the seal member 12 is removed by removing the bearing member 11. It is set as the structure formed so that attachment or detachment is possible.
[Selection] Figure 1

Description

  The present invention relates to a liquid feed pump, and in particular, in a laser diffraction type particle size distribution measuring apparatus, a liquid feed pump mechanism that is preferably used to send a sample liquid in which sample grains and liquid are mixed to a measuring section. About.

  Conventionally, as a liquid feed pump used in a laser diffraction particle size distribution measuring apparatus, there is one shown in FIG. This liquid feeding pump is responsible for feeding the mixed sample liquid mixed with the sample particles and the liquid stirred and dispersed in the dispersing tank to the measuring section, and the sample liquid is taken into the pump chamber 21 from the liquid inflow pipe 20 so that the sample liquid is pump rotor. 22 is sent to the liquid outflow pipe 23. The shaft 24 of the pump rotor 22 is supported by a bearing 27 of a bearing base 26 fixed to the substrate 25, and the other end of the rotor shaft 24 is connected to a shaft 30 of a motor 29 via a coupling 28. Further, in order to prevent leakage of the sample liquid from the pump chamber 21, a plurality of ring-shaped seal members 31 are arranged around the rotor shaft 24 and are detachable nuts with a collar 32 and a spring 33 interposed therebetween. The structure is closely fitted by the member 34.

  The diameter of the sample particles mixed in the sample liquid varies widely, from very small ones in nanometers to ones in micrometers and millimeters. Because of penetration, the seal member is heavily worn, requiring frequent replacement. In this replacement, the screw 29a for fixing the motor 29 and the fixing screw 28a for the coupling 28 are loosened to remove the motor 29 together with the coupling 28, and then the screw 26a for fixing the bearing base 26 is loosened to loosen the bearing base 26 to the rotor shaft 24. After the nut member 34 is removed, the nut member 34 is removed together with the collar 32 and the spring 33, and finally the seal member 31 is replaced. After replacing the seal member, the members are assembled in the reverse order of the previous disassembly work.

  However, in this conventional structure, removal and reassembly of each member at the time of seal replacement is very complicated and troublesome as described above, and there are many attachment / detachment parts such as the bearing base 26 and the motor 29. In addition, the axis of the rotor shaft 24 and the motor shaft 30 may be slightly shifted. If the shaft is misaligned, noise and vibration are generated, and the fluid flow becomes unstable, which adversely affects the analysis results. Accordingly, precise alignment is required each time the replacement is performed, and the replacement work of the seal member is further complicated.

  Therefore, the present invention mainly provides a liquid feed pump having a mechanism in which a seal member can be replaced with a simple operation and no shaft misalignment occurs between a rotor shaft and a motor shaft during reassembly. It is the purpose.

  In order to achieve the above object, the present invention takes the following technical means. That is, in the liquid feed pump according to the present invention, a body having a pump chamber therein and fixed to the substrate, a bearing member detachably connected to the body, and a rotor held by the bearing member A shaft, a pump rotor disposed in the pump chamber and rotated by a rotor shaft, a seal member disposed on a rotor shaft peripheral surface in the pump body, and a motor for driving the pump rotor, the motor being a bearing The rotor shaft and the motor shaft are detachably connected to each other via a coupling, and the seal member is formed to be detachable by removing the bearing member from the pump body.

According to the liquid feeding pump of the present invention, since the motor is held by the bearing member that is detachable from the pump body, the motor can be detached from the pump body simply by removing the bearing member together with the coupling. The seal member can be replaced in a short time with a simple operation, and the motor is connected and held to the bearing member, so the shaft core of the bearing member that receives the rotor shaft and the shaft core of the motor shaft fluctuate. Therefore, there is no deviation between the rotor shaft axis and the motor shaft axis at the time of reassembly. There is an effect that it is possible to eliminate the troublesome axis alignment work that has been performed.
In addition, the structure in which the bearing member is attached to the pump body and the motor is held on the bearing member has the effect of reducing the size and weight of the pump and reducing the cost.

(Means and effects for solving other problems)
In the above device, the motor may be attached to a flange portion integrally extended from the bearing member via a spacer.
As a result, the motor can be firmly connected and held to the bearing member with a simple configuration.

Moreover, in the said device, it is good to mount | wear the spring which presses and seals a sealing member from the bearing member side between a bearing member and a sealing member.
As a result, the sealing member can always be pressed against the sealing member storage space with a predetermined pressure to be brought into close contact with the circumferential surface of the rotor shaft, thereby enhancing the sealing effect.

Hereinafter, a liquid feed pump according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a liquid feed pump according to the present invention embodied as a liquid feed pump used in a laser diffraction particle size distribution measuring apparatus, and FIG. 2 is a state when a seal member is replaced. 1 is a sectional view showing a pump body. The pump body 1 is fixed to the substrate 4 via a stay 2 and a fixing bolt 2a, and a pump chamber 5 is formed inside.

  A pump rotor 3 that is rotated by a rotor shaft 6 is mounted in the pump chamber 5. The pump chamber 5 is provided with an inlet 7 for taking in a mixed sample liquid of sample particles and liquid stirred and dispersed in a dispersion tank (not shown) through an inflow pipe 8 and an outlet 9 for discharging the sample liquid. Then, the sample liquid is sent from the outflow pipe 10 connected to the outflow port 9 to a measurement unit (not shown).

  The rotor shaft 6 extends through the pump body 1 to the outside, and a bearing member 11 that supports the extended portion is detachably attached to the pump body 1 via attachment bolts 11a. The bearing member 11 includes a bearing 11 b that is in sliding contact with the rotor shaft 6. In the present embodiment, a plurality of seal members 12 are mounted on the circumferential surface of the rotor shaft 6 inside the pump body 1. The seal member 12 is a commercially available gland packing made of PTFE fiber and PTFE impregnated material. The seal member 12 can be attached and detached (replaced) from the outside by removing the bearing member 11 from the pump body 1 and the rotor shaft 6.

  The bearing member 11 is integrally formed with a flange portion 11c extending outward, and a motor 14 for driving the rotor shaft 6 via a plurality of spacers 13 is attached to the flange portion 11c. The shaft 15 of the motor 14 is accurately adjusted and arranged so as to be coaxial with the shaft core of the bearing 11 b of the bearing member 11, and is detachable from the rotor shaft 6 supported by the bearing member 11 via the coupling 16. It is comprised so that it can connect. That is, the bearing member 11 and the motor 14 are configured as one unit, and the bearing member 11 and the pump body 1 have a precise fitting portion 11d, and can be attached to and detached from the pump body 1 by the fitting portion 11d. Yes.

  Further, when the bearing member 1 is assembled to the pump body 1, a spring 17 is provided between the bearing member 11 and the pump body 1, together with the collar 18 and the spring receiver 19, for elastically pressing the seal member 12 from the bearing member 11 side. . Thereby, the sealing member 12 is always elastically pressed with a predetermined pressure so as to be in close contact with the peripheral surface of the rotor shaft 6 to enhance the sealing effect. The spring 17, the collar 18 and the spring receiver 19 can be removed from the rotor shaft 6 when the bearing member 11 is removed. Further, the elastic force of the spring 17 can be adjusted by two push screws 11 e provided on the bearing member 11, and the sealing effect of the sealing material 12 can be adjusted.

  In the above configuration, when the seal member 12 is replaced, as shown in FIG. 2, the mounting bolt 11 a of the bearing member 11 is loosened, and the fixing screw 16 a of the coupling 16 is loosened to loosen the unit of the bearing member 11 and the motor 14. Are removed from the pump body 1 and the rotor shaft 6. Thereby, there is no thing which restrains the sealing member 12, and it becomes possible to replace | exchange freely. After replacing the seal member 12, the collar 18, the spring 17, and the spring receiver 19 are sequentially fitted into the rotor shaft 6, and the unit of the bearing member 11 and the motor 14 may be attached to the pump body 1. At this time, since the motor 14 is connected and held to the bearing member 11 via the spacer 13 and is composed as one unit, the shaft core of the bearing 11b of the bearing member 11 and the shaft core of the motor shaft 15 may fluctuate. Since it is always held at the set position, there is no deviation between the axis of the rotor shaft 6 and the axis of the motor shaft 15 during reassembly. Also, when the unit of the bearing member 11 and the motor 14 is attached to or detached from the pump body 1, the seal member can be easily and quickly replaced by simply fitting the precise fitting portion 11d between the bearing member 11 and the pump body. Is something that can be done.

  The present invention can be used for various total liquid pumps including a sample liquid feed pump of a laser diffraction particle size distribution measuring apparatus.

Sectional drawing which shows one Example of the liquid feeding pump which concerns on this invention. Sectional drawing which shows the state at the time of seal member replacement | exchange of the said liquid feeding pump. Sectional drawing which shows the conventional liquid feeding pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump body 3 Pump rotor 4 Board | substrate 5 Pump chamber 6 Rotor shaft 11 Bearing member 11c Flange part 12 Seal member 13 Spacer 14 Motor 15 Motor shaft 16 Coupling

Claims (3)

  A pump body having a pump chamber therein and fixed to the substrate, a bearing member detachably connected to the pump body, a rotor shaft held by the bearing member, and disposed in the pump chamber and rotated by the rotor shaft A pump rotor, a seal member disposed on a rotor shaft peripheral surface in the pump body, and a motor for driving the pump rotor, the motor being connected and held by a bearing member, and the rotor shaft and the motor shaft A liquid feed pump, which is detachably connected via a coupling, and wherein the seal member is configured to be detachable by removing the bearing member from the pump body.   The liquid feed pump according to claim 1, wherein the motor is attached to a flange portion integrally extending from the bearing member via a spacer.   The liquid feed pump according to claim 2, wherein a spring for elastically pressing the seal member from the bearing member side is mounted between the bearing member and the pump body.

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