JP6185308B2 - Uniaxial eccentric screw pump - Google Patents

Description

  The present invention relates to a uniaxial eccentric screw pump for quantitatively feeding a viscous liquid such as a food material, and more particularly to a temperature adjusting mechanism suitable for adjusting the temperature of the viscous liquid fed by this type of uniaxial eccentric screw pump.

  As this type of uniaxial eccentric screw pump, for example, as in the uniaxial eccentric screw pump 100 illustrated in FIG. 2, a stator 101 having a female screw-like inner surface is fixed, and the stator 101 has a male screw-like spiral portion. It is known that the rotor 102 is inserted, and the rotor 102 is connected to a drive shaft 104 via a universal joint 103 using a pin (not shown) in a connecting portion (see, for example, Patent Document 1). Further, in place of the universal joint 103, a rotor is connected to a drive shaft through a flexible joint (see, for example, Patent Document 2).

  In the example shown in the figure, the base end portion of the drive shaft 104 is connected to the output shaft 121 of the motor 120 via the coupling 122, and when the drive shaft 104 rotates by driving the motor 120, the universal joint 103 is connected. Thus, the rotation axis of the rotor 102 revolves around the axis of the stator 101. Thereby, the viscous liquid is pumped from the suction port 131 of the housing 130 toward the discharge port 132. In the example of the figure, the shaft between the front end portion of the drive shaft 104 and the bracket 110 is sealed with a mechanical seal 105.

JP 2011-256910 A JP 2006-161794 A

By the way, some viscous liquids pumped by a uniaxial eccentric screw pump solidify below a predetermined temperature, such as food materials such as jelly and chocolate. Therefore, when pumping such a viscous liquid, it is necessary to maintain a temperature at which the viscous liquid does not solidify.
In order to solve such a problem, the single-shaft eccentric screw pump described in Patent Documents 1 and 2 has a structure in which the rotation axis of the rotor 102 revolves around the axis of the stator 101, and therefore, between the rotor 102 and the drive shaft 104, The universal joint (or flexible joint) 103 needs to be interposed, and it is difficult to raise the temperature of the rotor 102 itself in order to maintain a temperature at which the viscous liquid does not solidify. Therefore, in order to maintain a temperature at which the viscous liquid does not solidify, a band heater is wound around the outer periphery of the housing 130 and the stator 101 of the uniaxial eccentric screw pump 100 or a double jacket structure is used to obtain the desired viscous liquid. Measures were taken to maintain the temperature.

However, even if an attempt is made to maintain the viscous liquid at a desired temperature from the outer periphery of the housing 130 or the stator 101, the heat transfer becomes indirect because the separation distance is long, and sufficient heat transfer to the viscous liquid is difficult. Therefore, it is difficult to stably maintain the liquid temperature at a desired temperature, and the viscous liquid near the rotor 102 and the universal joint (or flexible joint) 103 is solidified, so that the uniaxial eccentric screw pump 100 is stably operated. There is a problem of inhibiting. Further, when the mechanical seal 105 as illustrated in FIG. 2 is used, if the viscous liquid in the vicinity of the mechanical seal 105 is solidified, there is a problem that the sealing function is hindered and a liquid leakage trouble is caused.
Therefore, the present invention has been made paying attention to such problems, and provides a single-shaft eccentric screw pump capable of controlling the temperature of the viscous liquid to be pumped by heat transfer from the rotor side. Objective.

In order to solve the above-described problem, a uniaxial eccentric screw pump according to an aspect of the present invention includes a stator having a female screw-shaped inner surface, and a rotor in which a male screw-shaped spiral portion is inserted into the stator, and the stator includes The rotor is rotatably supported, the rotor is fixed to the drive shaft, and the rotation axis of the rotor is configured to be eccentric from the rotation axis of the stator by a predetermined distance. The stator is 1/0 of the rotation speed of the rotor. A single-shaft eccentric screw pump that pumps viscous liquid sucked from the suction side to the discharge side by dependently rotating at a rotational speed of 2, driven to the drive shaft from a direction orthogonal to the axial direction of the drive shaft a drive unit provided so as to transmit a force, a communicating hole formed in communication with the rear end of the drive shaft to the inner helical portion of the rotor, or the rear end of the drive shaft in the interior of the communicating hole Characterized in that it comprises a supply and discharge means for supplying and discharging a cooling fluid or NoboriAtsushieki.

  Here, in the uniaxial eccentric screw pump according to an aspect of the present invention, the supply / discharge means has an opening at its front end and an insertion pipe line inserted into the communication hole from the rear end of the drive shaft. A rotary joint attached to the rear end of the insertion pipe, and an annular region defined between the outer peripheral surface of the insertion pipe and the inner peripheral surface of the communication hole, An in-pipe area communicates with each other through the opening, and the rotary joint is an inlet through which the coolant or the temperature rising liquid is supplied and discharged so as to circulate through the annular area and the in-pipe area. And having an outlet.

  According to the present invention, the stator is rotatably supported, the rotor is fixed to the drive shaft, and the rotation axis of the rotor is configured to be eccentric from the rotation axis of the stator by a predetermined distance. Is a uniaxial eccentric screw pump that pumps the viscous liquid sucked from the suction side to the discharge side by subordinate rotation at a rotational speed of 1/2 of the above, unlike the uniaxial eccentric screw pump described in Patent Documents 1 and 2, A universal joint or flexible joint is not required between the rotor and the drive shaft, and the rotor can be fixed to the drive shaft.

According to the present invention, the drive unit provided so as to transmit the driving force to the drive shaft from the direction orthogonal to the axial direction of the drive shaft, and the rear end of the drive shaft communicate with the inside of the spiral portion of the rotor. Since it is configured to include the formed communication hole and supply / discharge means for supplying / discharging the coolant or the temperature rising liquid from the rear end of the drive shaft in the communication hole, the rear end of the drive shaft is arranged in the spiral portion of the rotor. It is possible to supply or discharge the cooling liquid or the temperature rising liquid. Therefore, the temperature of the viscous liquid fed by pressure can be controlled by heat transfer from the rotor side.

  Therefore, even when viscous liquid that solidifies below a predetermined temperature, such as jelly or chocolate, is pumped, the viscous liquid near the rotor can be prevented from solidifying, and the temperature at which the viscous liquid does not solidify is set. It can be held stably. Even when a mechanical seal is used, the viscous liquid in the vicinity of the mechanical seal can be prevented from solidifying and the sealing function is maintained, so that no liquid leakage trouble occurs.

It is a figure explaining one Embodiment of the uniaxial eccentric screw pump concerning one mode of the present invention, and the figure shows the section which met an axis. It is a figure explaining an example of the conventional uniaxial eccentric screw pump, and the figure has shown the section which met an axis.

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. The motor 10 is mounted on the upper surface of the drive unit 13 through the motor bracket 12 so that its axis is vertical. A bracket 14 is connected to the side surface of the drive unit 13 (the surface on the left side of the figure). Further, the suction portion housing 20 is fixed to the side surface (the left side surface in the figure) of the bracket 14, and the cylindrical body housing 7 is fixed to the side surface (the left side surface in the figure). Yes. Note that the suction housing 20 is also placed on the base bracket 11.

  The suction portion housing 20 has a substantially L-shaped suction conduit 20a inside. Of the suction pipes 20 a, the pipes that face in the vertical direction communicate with the suction port 9, and the pipes that face in the horizontal direction communicate with the inside of the main body housing 7. And the drive shaft 3 is inserted in the horizontal direction from the right side of the figure with respect to the pipe line which faces this horizontal 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 vertically via the orthogonal gear mechanism. Thus, the drive shaft 3 is interlocked and driven in a posture that is orthogonal to the output shaft of the motor 10 and faces the horizontal direction.

  Further, in the uniaxial eccentric screw pump 1, a male screw-shaped rotor 2 and a stator 4 having a female screw-shaped inner surface are arranged in the main body housing 7 so that the axis thereof is directed in the horizontal direction. Further, the main body housing 7 is provided with a discharge port 8 for a pumping fluid on the side opposite to the suction portion housing 20. The main body housing 7 and the suction portion housing 20 and the main body housing 7 and the discharge port 8 are fixed easily by a ferrule clamp 22, and an O-ring (not shown) is interposed between the mutual contact surfaces. Yes. Further, both ends of the stator 4 are sealed between the discharge port 8 and the suction portion housing 20 by seal members 16 and 17, respectively.

  The rotor 2 includes a spiral portion 2a on the distal end side and a linear base end portion 2b. The straight base end 2b is directly connected coaxially to the tip of the drive shaft 3 without using a universal joint. In the example of this embodiment, the drive shaft 3 and the rotor 2 are integrally formed. 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 a stator 4 that has an internal thread-shaped inner surface. Note that a mechanical seal 18 seals the tip of the drive shaft 3 (which is also the linear base end 2 b of the rotor 2) and the bracket 14.

  On the other hand, the stator 4 has an elastomeric spiral portion 4a formed with an internal surface of a female thread, and a steel support portion 4b having a substantially cylindrical shape joined to the outer peripheral surface of the spiral portion 4a. The pitch of the female thread of the stator 4 is twice that of the spiral portion 2a. The stator 4 is rotatably supported in the main body housing 7 via bearings 5 and 6 at both ends of the support portion 4b. 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.

  Here, the uniaxial eccentric screw pump 1 extends rearward to a position where the rear end of the drive shaft 3 projects from the side surface (the right side surface in the figure) of the drive unit 13. The rotor 2 is formed with a communication hole 31 that opens at the rear end of the drive shaft 3 and communicates with the spiral portion 2a along the axial direction. Further, the insertion pipe 32 is inserted into the communication hole 31 from the rear end of the drive shaft 3 to the inside of the spiral portion 2a. This insertion pipe line 32 is a thin and long pipe member, and has an opening 33 at its tip, and an annular region is formed between the outer peripheral surface of the insertion pipe line 32 and the inner peripheral surface of the communication hole 31. In addition, a region in the conduit is formed in the insertion conduit 32. A rotary joint 34 is attached to the rear end of the drive shaft 3. The rotary joint 34 has an inlet 35 and an outlet 36 for supplying and discharging the cooling liquid or the temperature rising liquid.

  In this example, the port communicating with the injection port 35 is connected to the in-pipe region in the insertion conduit 32, and the port communicating with the discharge port 36 is connected to the outer peripheral surface of the insertion conduit 32 and the communication hole 31. It connects with respect to the cyclic | annular area | region defined between inner peripheral surfaces. As a result, supply / discharge means for supplying / discharging the cooling liquid or the temperature rising liquid is configured, and the cooling liquid or the temperature rising liquid supplied from the inlet 35 of the rotary joint 34 passes through the in-pipe area and the insertion line 32. It is possible to circulate by being introduced into the annular region from the opening 33 at the tip and discharged from the discharge port 36 through the annular region.

Next, the operation and effect of the uniaxial eccentric screw pump 1 will be described.
When the uniaxial eccentric screw pump 1 drives a motor 10 arranged in a vertical posture, the drive shaft 3 rotates around an axis orthogonal to the output shaft of the motor 10 and a horizontal axis via an orthogonal gear mechanism of the drive unit 13. To do. Then, the rotor 2 integrally formed coaxially with the rotation of the drive shaft 3 rotates around a horizontal axis around the rotation axis L2. As a result, the stator 4 is driven to rotate at a rotational speed of ½ around the rotation axis L <b> 1 in synchronization with the rotation of the rotor 2 along with the movement of the spiral portion 2 a of the rotor 2, and from the suction port 9 to the discharge port 8. The pumped liquid is pumped to

  That is, according to the uniaxial eccentric screw pump 1, the stator 4 is rotatably supported, the rotor 2 is fixed to the drive shaft 3, and the rotation axis L2 of the rotor 2 is eccentric from the rotation axis L1 of the stator 4 by a predetermined distance. Since the stator 4 is subordinately rotated at a rotational speed that is ½ of the rotational speed of the rotor 2, the viscous liquid sucked from the suction side is pumped to the discharge side. Unlike the single-shaft eccentric screw pump described in 2, no universal joint or flexible joint is required between the rotor 2 and the drive shaft 3, and the rotor 2 can be fixed to the drive shaft 3.

  According to the single-shaft eccentric screw pump 1, the drive unit 13 provided to transmit the drive force to the drive shaft 3 from the direction orthogonal to the axial direction of the drive shaft 3, and the rotor from the rear end of the drive shaft 3 2 is provided with a communication hole 31 formed to communicate with the inside of the spiral portion 2a, and supply / discharge means for supplying / discharging the coolant or the temperature rising liquid from the rear end of the drive shaft 3 in the communication hole 31. Cooling liquid or temperature rising liquid can be supplied and discharged from the rear end of the drive shaft 3 into the spiral portion 2 a of the rotor 2. Therefore, the temperature of the viscous liquid fed by pressure can be controlled by heat transfer from the rotor 2 side.

  Accordingly, even when viscous liquid that solidifies below a predetermined temperature, such as jelly or chocolate, is pumped, the temperature of the viscous liquid in the vicinity of the rotor 2 can be prevented from solidifying and the viscous liquid does not solidify. Can be held stably. Even when the mechanical seal 18 is used, the viscous liquid in the vicinity of the mechanical seal 18 can be prevented from solidifying and the sealing function is maintained, so that no liquid leakage trouble occurs.

The single-shaft 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 embodiment, the motor 10 is mounted vertically, and the main body housing 7 is disposed in the horizontal direction. However, the present invention is not limited to this, and the posture of the uniaxial eccentric screw pump 1 is necessary. It can be changed accordingly. For example, the uniaxial eccentric screw pump 1 in which the motor 10 is mounted horizontally and the main body housing 7 is disposed in the vertical direction can be used.

  Further, for example, in the above-described embodiment, the driving unit 13 is described as an example in which the motor 10 is mounted vertically and the driving force is transmitted to the driving shaft 3 from a direction orthogonal to the axial direction of the driving shaft 3. The configuration of 13 is not limited to this, and a communication hole 31 formed to communicate from the rear end of the drive shaft 3 to the inside of the spiral portion 2a of the rotor 2 is secured, and the drive shaft 3 of the drive shaft 3 is placed in the spiral portion 2a of the rotor 2. If supply / discharge means (32, 34, etc.) for supplying / discharging the cooling liquid or temperature rising liquid from the rear end can be provided, for example, the motor output shaft is provided substantially coaxially with the drive shaft 3, and the A motor having a through hole that communicates from the rear end of the motor output shaft (drive shaft 3) to the inside of the spiral portion 2a of the rotor 2 along the axial direction can be used. When the motor output shaft is arranged in parallel with the drive shaft 3, the motor output shaft may be provided in parallel with the drive shaft 3 via a gear mechanism, and the drive unit 13 is not necessarily in the axial direction of the drive shaft 3. Need not be provided in the orthogonal direction.

DESCRIPTION OF SYMBOLS 1 Uniaxial eccentric screw pump 2 Rotor 2a Spiral part 3 Drive shaft 4 Stator 5, 6 Bearing 7 Main body housing 8 Discharge port 9 Suction port 10 Motor 11 Base bracket 12 Motor bracket 13 Drive part 14 Bracket 31 Communication hole 32 Insertion pipe line 33 Opening Portion 34 Rotary joint 35 Inlet 36 Outlet E Eccentricity L1 Rotation axis L2 Rotation axis

Claims (2)

A stator having a female screw-like inner surface; and a rotor in which a male screw-like spiral portion is inserted into the stator, the stator being rotatably supported, the rotor being fixed to a drive shaft, and a rotation axis of the rotor Is configured to be eccentric from the rotation axis of the stator by a predetermined distance, and when the stator is subordinately rotated at a rotational speed that is half the rotational speed of the rotor, the viscous liquid sucked from the suction side is discharged. A uniaxial eccentric screw pump that pumps to the side,
A drive unit provided to transmit a driving force to the drive shaft from a direction orthogonal to the axial direction of the drive shaft, and a communication formed from the rear end of the drive shaft to the spiral portion of the rotor A uniaxial eccentric screw pump, comprising: a hole; and supply / discharge means for supplying / discharging a coolant or a temperature rising liquid from a rear end of the drive shaft into the communication hole. The supply / discharge means has an opening at its front end and an insertion pipe inserted into the communication hole from the rear end of the drive shaft, and a rotary joint attached to the rear end of the insertion pipe Prepared,
An annular region defined between the outer peripheral surface of the insertion pipe and the inner peripheral surface of the communication hole and a pipe inner region in the insertion pipe communicate with each other through the opening. ,
2. The uniaxial eccentric screw according to claim 1, wherein the rotary joint has an inlet and an outlet for supplying and discharging a cooling liquid or a temperature rising liquid so as to circulate through the annular area and the pipe inner area. pump.

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