JP5914602B2 - Uniaxial eccentric screw pump - Google Patents

Description

  The present invention relates to a uniaxial eccentric screw pump that can be suitably used for pumping a highly viscous pumping liquid such as food raw materials and chemical raw materials.

  As this type of single-shaft eccentric screw pump, there is one in which a male-threaded rotor is housed in a fixed stator having a female-threaded inner surface, and the rotor is connected to a drive shaft via a universal joint (for example, Patent Documents). 1). According to this single-shaft eccentric screw pump, by rotating the drive shaft, the rotor can rotate and perform an eccentric motion with respect to the shaft center of the stator, whereby the pumped liquid can be pumped from the suction side to the discharge side. .

  However, in this uniaxial eccentric screw pump, the rotational axis of the rotor revolves around the axis of the stator, so that the driving force of the motor 110 is applied to the driving shaft 103 of the driving unit 113 and the rotor 102 as illustrated in FIG. It was necessary to pass through universal joints 120 (120a, 120b, 120c) provided between the two. Therefore, it is a problem that it is difficult to clean the universal joint 120 when pumping food materials or the like. Therefore, in the example shown in the figure, a casing 130 having an attachment slope 130 a is provided, and the rotor 102 and the stator 104 are obliquely arranged on the attachment slope 130 a, and a hopper 115 is provided above the rotor 102 and the stator 104. Thus, a device has been devised to make one universal joint (only the universal joint 120b in the hopper 115) in contact with the liquid.

Japanese Patent Laid-Open No. 51-13404

  However, even if the rotor 102 and the stator 104 are arranged vertically or obliquely, as shown in FIG. 2, since one universal joint 120b is in contact with the liquid, the pressure-feeding liquid adheres to the universal joint 120b. Easy and its cleaning is still difficult. In addition, since the single universal joint 120b is in the vicinity of the suction port 108, there is a problem that resistance is generated in the case of a highly viscous pumping liquid. Furthermore, in order to clean the dead space of the universal joint 120, it is difficult to clean the universal joint 120 unless the universal joint 120 is disassembled.

In the uniaxial eccentric screw pump 100 using the universal joint 120 illustrated in FIG. 2, the stator 104 is fixed and the rotor 102 rotates while receiving a large reaction force. easy. Further, since the drive shaft 103, the drive unit 113, the motor 110, and the like are above the hopper 115, these interfere with the feeding of the raw material into the hopper 115, and the pressure feed liquid in the hopper 115 is supplied from the drive unit 113. There is no risk of contamination with foreign waste or foreign matter.
Therefore, the present invention has been made paying attention to such problems, and an object of the present invention is to provide a uniaxial eccentric screw pump that can suppress the pumping resistance and the liquid pool as much as possible.

In order to solve the above-mentioned problems, a single-shaft eccentric screw pump according to an aspect of the present invention is supported by a male screw-like rotor that is directly connected to the same shaft as a drive shaft, and is rotatably supported via a bearing. A stator having a female screw-shaped inner surface that is supported eccentrically with respect to the rotation axis of the rotor, and sucks the pumped liquid by performing an eccentric motion with respect to the axis of the stator while the rotor rotates. A uniaxial eccentric screw pump that pumps from the discharge side to the discharge side, wherein the drive shaft is coupled so as to be orthogonal to the output shaft of the motor, and a housing bracket that is mounted and fixed on the upper portion of the drive portion When it is connected to the discharge housing which is fixed to the upper portion of the housing bracket, and the main housing fixed to the upper portion of said discharge exit housing, on top of the body housing inhalation And a pipe, the discharge unit housing has a generally L-shaped delivery line of the interior, of said discharge Dekanro, conduit facing the horizontal direction is communicated with the discharge port, the vertical A facing pipe line communicates with the inside of the main body housing, and the drive shaft is inserted upward from the lower part of the pipe line facing the vertical direction, and the rotor and the stator are arranged in the main body housing. In addition, the driving portion faces the opening of the suction side pipe so that the end face of the rotor and the end face of the stator are in contact with the pressure feeding liquid in the suction side pipe connected to the upper portion of the main body housing. It is characterized by being placed vertically on the top of the.

Here, in the single-shaft eccentric screw pump according to an aspect of the present invention, the motor is mounted on one side surface of the drive unit via a motor bracket with the output shaft of the motor being horizontal, and the vertical It is preferable that the highest part of the motor in the direction is mounted at a position lower than the bottom surface of the discharge part housing.
According to the uniaxial eccentric screw pump according to the present invention, the drive shaft is provided so as to be connected so as to be orthogonal to the output shaft of the motor, and the rotor and the stator have an end surface of the rotor and an end surface of the stator, A conventional uniaxial eccentric screw pump is placed vertically above the drive unit facing the opening of the suction side pipe so as to come into contact with the pumped liquid in the suction side pipe connected to the upper part of the main body housing. In comparison with the above, the pumping liquid is directly sucked into the stator, and the pumping resistance and the liquid pool can be suppressed as much as possible as a streamline from the upper side to the lower side. In addition, since the universal joint is not necessary, the problem of cleaning the universal joint, which has been a problem until now, is solved.

Furthermore, with such a configuration, the suction side pipe and the stator connected to the upper part of the main body housing , and these housings can be easily disassembled upward even in disassembly and assembly. Excellent cleanability. Further, unlike the above-described conventional example, there is no universal joint that serves as a suction resistance for the pressure-feeding liquid, so that the pressure-feeding liquid in the suction side pipe connected to the upper part of the main body housing can be sucked without resistance. Further, since there is no drive part or shaft that disturbs the raw material at the upper part of the main body housing, there is no fear of dust and foreign matter mixed into the pumped liquid in the main body housing.

  Here, in the uniaxial eccentric screw pump according to the present invention, for example, if the stator both ends and the drive unit through which the drive shaft is inserted are sealed by a resin seal with a spring covered with resin, Due to the synergistic effect with the structure that flows from top to bottom, it is suitable for providing a single-shaft eccentric screw pump that is excellent in cleaning properties, is difficult to propagate germs, and is excellent from a hygienic viewpoint.

  As described above, according to the uniaxial eccentric screw pump according to the present invention, it is possible to suppress the pressure feeding resistance and the liquid pool as much as possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of one Embodiment of the uniaxial eccentric screw pump which concerns on this invention, In the same figure, the principal part is shown in the cross section along an axis line. It is a front view of an example of the conventional uniaxial eccentric screw pump, and the principal part is illustrated with the section along an axis in the figure.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, the uniaxial eccentric screw pump 1 has a base bracket 11 at a lower portion, and a drive unit 13 is fixed on the base bracket 11 by fastening bolts and nuts. The drive unit 13 has a motor 10 mounted horizontally on one side surface via a motor bracket 12. Further, a housing bracket 14 is placed and fixed on the upper portion of the drive unit 13 by fastening bolts and nuts. A discharge unit housing 20 is fixed on the housing bracket 14, and a cylindrical body housing 7 is fixed on the discharge unit housing 20.

  The discharge part housing 20 has a substantially L-shaped discharge pipe line 20a therein. Of the substantially L-shaped discharge pipe 20 a, a pipe that faces in the horizontal direction communicates with the discharge port 9, and a pipe that faces in the vertical direction communicates with the inside of the main body housing 7. Further, the drive shaft 3 is inserted upward from the lower part of the pipe line facing the vertical direction. Here, the drive unit 13 has an orthogonal gear mechanism (not shown) inside, and the drive shaft 3 is connected to the output shaft (not shown) of the motor 10 arranged horizontally via the orthogonal gear mechanism. Thus, the drive shaft 3 is connected so as to be orthogonal to the output shaft of the motor 10 and to face the vertical direction.

  Further, in the uniaxial eccentric screw pump 1, a male screw-like rotor 2 and a stator 4 having a female screw-like inner surface are vertically arranged in the main body housing 7 so that the axis is oriented in the vertical direction. . The upper part of the main body housing 7 is a suction port 8 for pumping fluid, and a funnel-like hopper 15 is fixed to the suction port 8. The upper portion of the main body housing 7 and the hopper 15 are fixed to each other, and the lower portion of the main body housing 7 and the discharge portion housing 20 are fixed to each other by a ferrule clamp 22, and an O-ring 23 is interposed between the contact surfaces. ing. Further, in this uniaxial eccentric screw pump 1, a spring in which seal portions 16 and 17 at both ends of the stator 4 serving as a liquid contact portion and a seal portion 18 in which the drive shaft 3 is penetrated by the drive portion 13 are coated with resin. Each is sealed with a resin seal.

  And the rotor 2 has the spiral part 2a of the front end side, and the linear base end part 2b. The base end 2b is directly connected coaxially to the tip of the lower drive shaft 3 without using a universal joint. On the other hand, the spiral portion 2a has an oval cross section that is eccentric with respect to its own rotation axis L2, and this spiral portion 2a is housed in the stator 4 having a female screw-like inner surface.

On the other hand, the upper and lower ends of the stator 4 are rotatably supported via bearings 5 and 6. The rotation axis L2 of the rotor 2 is arranged to be eccentric by a predetermined eccentric amount E with respect to the rotation axis L1 of the stator 4. Note that the pitch of the female thread of the stator 4 is twice that of the spiral portion 2a.
When this single-shaft eccentric screw pump 1 drives a motor 10 that is horizontally disposed below, the drive shaft 3 is orthogonal to the output shaft of the motor 10 and rotates around the vertical axis via the orthogonal gear mechanism of the drive unit 13. Rotate to. When the rotor 2 coaxial with the drive shaft 3 rotates about the vertical axis, the rotor 2 rotates about the rotation axis L1. Further, along with the movement of the spiral portion 2a of the rotor 2, the stator 1 is also driven and rotated around the rotation axis L2 in synchronization with the rotation of the rotor 2, whereby the liquid in the hopper 15 that stores the pumped liquid is discharged. The upper suction port 8 can be pumped to the lower discharge port 9.

Next, the operation and effect of this uniaxial eccentric screw pump will be described.
As described above, this single-shaft eccentric screw pump 1 has the drive shaft 3 coupled in the direction orthogonal to the output shaft of the motor 10 by the drive unit 13 having an orthogonal gear mechanism, and the rotor 2 and the stator 4 are connected to the drive shaft 3. Since the hopper 15 is disposed vertically above the hopper 15, the hopper 15 is disposed on the upper portion thereof. Therefore, for example, compared to the conventional uniaxial eccentric screw pump with a hopper illustrated in FIG. While directly sucking the pumped liquid, it is possible to suppress the pumping resistance and the liquid pool as much as possible as a streamline from the upper side to the lower side.

Moreover, according to this uniaxial eccentric screw pump 1, since a universal joint becomes unnecessary, the problem of cleaning of a universal joint which has been a problem until now is solved. Further, since there is no universal joint that serves as a suction resistance for the pressure feeding liquid as in the prior art, the pressure feeding liquid in the hopper can be directly sucked without resistance.
Further, according to the single-shaft eccentric screw pump 1, the hopper 15, the stator 4 and the main body housing 7 can be easily disassembled upward even in disassembly and assembly, and these are also excellent in cleanability. In addition, since there is no drive unit or shaft in the upper part of the hopper 15 that interferes when the raw material is charged, there is no fear of contamination of foreign matter or foreign matter into the pressure feeding liquid in the hopper 15.

  Further, this single-shaft eccentric screw pump 1 includes a resin-coated spring-coated seal portion 16, 17 at both ends of the stator 4 serving as a liquid contact portion and a seal portion 18 of the drive portion 13 that passes through the drive shaft 3. Since each of them is sealed by a resin seal, it is excellent in cleaning properties and has a good hygiene viewpoint due to a synergistic effect with a structure in which the pumping liquid flows from top to bottom, and it is difficult for bacteria to propagate.

As described above, according to the uniaxial eccentric screw pump 1, it is possible to suppress the pumping resistance and the liquid pool as much as possible.
The uniaxial eccentric screw pump according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the example in which the hopper 15 for storing the pressure feeding liquid is attached to the upper part of the main body housing 7 is described. However, the present invention is not limited to this, and the pipe for sucking the pressure feeding liquid to the upper part of the main body housing 7. May be connected.

DESCRIPTION OF SYMBOLS 1 Uniaxial eccentric screw pump 2 Rotor 3 Drive shaft 4 Stator 5, 6 Bearing 7 Main body housing 8 Suction port 9 Discharge port 10 Motor 11 Base bracket 12 Motor bracket 13 Drive part 14 Housing bracket 15 Hopper 16 (Suction side) Seal part 17 (Discharge side) Seal part 18 (Drive shaft) Seal part 20 Discharge part housing 22 Ferrule clamp 23 O-ring

Claims (2)

An externally threaded rotor that is directly connected to the same shaft as the drive shaft, and an internally threaded inner surface that is rotatably supported via a bearing and whose rotational axis is supported eccentrically with respect to the rotational axis of the rotor. A single-shaft eccentric screw pump that pumps the pumped liquid from the suction side to the discharge side by performing an eccentric motion with respect to the axis of the stator while the rotor rotates.
A drive unit connected so that the drive shaft is orthogonal to the output shaft of the motor, a housing bracket mounted and fixed on the upper part of the drive unit, and a discharge unit housing fixed on the upper part of the housing bracket; A main body housing fixed to the upper part of the discharge part housing, and a suction side pipe connected to the upper part of the main body housing,
The discharge section housing has a substantially L-shaped discharge pipe inside, and a horizontal pipe line communicates with the discharge port among the discharge pipe lines, and a vertical pipe line extends to the discharge port. The drive shaft communicates with the inside of the main body housing, and the drive shaft is inserted upward from the lower part of the pipe line facing in the vertical direction.
The rotor and stator, wherein while being disposed within the body housing, the end face and the end face of the stator of the rotor, said to wetted with pumped liquid connected to said upper portion of the main body housing in the intake piping A single-shaft eccentric screw pump, wherein the pump is disposed vertically above the drive unit so as to face the opening of the suction side pipe .   The motor is mounted on one side surface of the drive unit via a motor bracket with the output shaft of the motor being horizontal, and the highest portion of the motor in the vertical direction is the bottom surface of the discharge unit housing. The uniaxial eccentric screw pump according to claim 1, wherein the uniaxial eccentric screw pump is mounted at a lower position.

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