JP2020029791A - Deforming pump unit - Google Patents

Abstract

To provide a deforming pump unit capable of highly deairing even when the air bubble is difficult to move viscose fluid and the transferred viscous fluid does not change in quality or the parts abrasion powder mixes in.SOLUTION: A deforming pump unit 1 comprises: a pair of pump screws; a cylindrical pump casing 2; a first viscose fluid intake 18 of the pump casing 2; a delivery port 19 of the pump casing 2; a gas outlet 20 provided in the pump casing 2; rotary parts non-contact twin screw pump part A with a deaerator 27; an agitator part B for agitating the viscose fluid Q sent to the first viscose fluid intake 18 connected to the inlet side of the first viscous fluid intake 18 of the twin screw pump part A; and the agitator part B having a contraction valve 70.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a defoaming pump device that transfers a viscous fluid as an object to be transferred with a high defoaming ability without deteriorating physical properties of the object.

  Conventionally, as this type of defoaming pump device, a device described in Patent Document 1 below is known. The defoaming pump device described in the document is a twin screw pump with a deaerator, and as shown in FIGS. 5 and 6 of Patent Document 1, the side surfaces 7Sa and 7Sb of a pair of pump screws 7a and 7b are provided. Gaps G and H are formed between the pump screws 7a and 7b and between the distal end surfaces 7B and 7B of the pump screws 7A and 7B and the inner peripheral surface 2A of the pump casing, respectively, so that gas such as air can pass therethrough but not viscous fluid. In this device, the viscous fluid is transferred while discharging the gas in the viscous fluid out of the machine by driving a degassing device connected to the gas outlet of the pump casing. Although it is a positive displacement pump having the pump screws 7a and 7b, it has a function of discharging and transferring gas from a viscous fluid.

JP 2015-55179 A

  However, the twin-screw pump described in Patent Literature 2 transfers a viscous fluid such as a soft alginate in which a large number of air bubbles are scattered in a dispersion medium and are stably stationary and do not move. In this case, the viscous fluid is transported almost without collapse while maintaining the spiral space shape of the pump chamber, so that the bubbles are also difficult to move in the viscous fluid, and the bubbles partially remain and deaerate. There was a problem that it could not be cut.

  The present invention has been made in view of the above-mentioned conventional problems, and it goes without saying that the transferred viscous fluid does not change in quality or that abrasion powder from parts does not mix. An object of the present invention is to provide a defoaming pump device capable of highly degassing even a viscous fluid having a property that bubbles are stationary and hard to move by assisting the ability.

  In order to achieve the above object, a defoaming pump device according to the present invention includes a pair of pump screws which are screwed in non-contact with each other and driven to rotate, and a cylindrical pump casing which accommodates a pair of pump screws in a non-contact manner. A first viscous fluid inlet provided in the middle of the cylinder of the pump casing, a discharge port provided on the tip side of the pump casing, a gas vent provided on the pump casing at a more distal end than the first viscous fluid intake, And a degassing device connected to the gas outlet, and between the side surfaces of the pair of pump screws, and between the tip surface of each pump screw and the inner peripheral surface of the pump casing, gas can pass. A twin-screw pump unit having a gap formed therein that does not allow the passage of a viscous fluid, and a biaxial screw pump unit connected to an inlet side of a first viscous fluid intake of the twin-screw pump unit. And a stirrer unit for stirring the viscous fluid sent to the first viscous fluid intake of the screw pump unit, wherein the stirrer unit is a cylindrical stirring casing, and a second viscous fluid provided in the stirring casing. Inlet, fluid outlet provided at the axial end of the stirring casing and connected to the first viscous fluid intake of the twin-screw pump section, provided inside the stirring casing and driven to rotate around the axis of the stirring casing. A stirring member for stirring the viscous fluid, and a throttle valve connected to the second viscous fluid intake to reduce the amount of the viscous fluid taken in from the outside. is there.

  In each of the above-described configurations, the stirring member includes a shaft connecting portion to which the rotation drive shaft is connected, an extended arm portion extending radially outward from the shaft connecting portion, and a shaft connecting portion extending from the distal end of the extended arm portion. And a stirring blade portion extending along the axial direction of the blade.

  Further, in each of the above-described configurations, the twin-screw pump section has a first viscous fluid inlet provided in an upper portion of the pump casing, and a check valve that allows the flow of the viscous fluid only in the viscous fluid transfer direction. The check valve is connected to the outlet side of the discharge port of the pump casing, and when the pressure of the discharge port exceeds a preset pressure set in the check valve, the check valve opens to allow the viscous fluid to flow. It is characterized by being constituted.

  The defoaming pump device according to the present invention stirs the viscous fluid sent to the first viscous fluid intake of the twin-screw pump unit, which is a positive displacement twin-screw pump unit containing a pair of non-contact pump screws. It is needless to say that the twin-screw pump section does not deform the viscous fluid or mix in the abrasion powder of the parts because the rotating parts do not shear the viscous fluid in a non-contact manner. In addition, the viscous fluid depressurized by the deaerator of the twin-screw pump section is squeezed by the throttle valve and is stirred in the stirrer section without using centrifugal force. However, the pressure of the air bubbles becomes closer to a complete vacuum, and the scattered individual bubbles themselves expand and move easily in the fluid, so that the air bubbles collide and coalesce to increase the diameter. In addition, the viscous fluid itself is easily fluidized. The viscous fluid taken into the pump casing of the twin-screw pump section has a large-diameter bubble that easily moves toward the gas outlet in the pump casing. Even with a viscous fluid that hardly moves, gas can be reliably and highly extracted.

  Further, since the stirrer unit includes the stirring casing, the second viscous fluid intake, the fluid outlet, and the stirring member, the viscous fluid is stirred without centrifugal force by the stirring member rotating around the axis of the stirring casing. Therefore, it is possible to prevent a problem that the composition of the viscous fluid is sheared and deteriorated.

  And, when the stirring member is provided with the shaft connecting portion, the extending arm portion, and the stirring blade portion, the stirring blade portion extending in the axial direction moves the viscous fluid moving in the stirring casing in the axial direction. Since the stirring is performed, the time during which the stirring blade portion is in contact with the viscous fluid can be maintained for a long time. Therefore, deaeration can be improved by fluidizing the viscous fluid and promoting collision between bubbles.

  Further, in the case where the first viscous fluid intake is provided at the upper part of the pump casing and the check valve is provided at the outlet side of the discharge port, the check valve is provided when the pressure at the discharge port is lower than the set pressure. Is closed and pump transfer and deaeration are performed in the pump casing, so that even a viscous fluid located below the pump casing can be sucked up and taken into the pump casing. Thereafter, when the pressure at the discharge port exceeds the set pressure, the check valve opens and the viscous fluid flows.

1 is a side view showing a defoaming pump device according to an embodiment of the present invention. It is a partial front view showing the defoaming pump device. It is a side view including a partial section showing an important section of the defoaming pump device. FIG. 6 is an internal configuration diagram including a partial cross section of a twin screw pump section of the defoaming pump device, and is a cross sectional view taken along line DD in FIG. 5. FIG. 2 is an internal plan configuration diagram including a partial cross section of the twin screw pump section. It is a figure for explaining the crevice in the above-mentioned twin screw pump part, (a) is a partial enlarged plan view showing the crevice between a pair of pump screws, (b) is between a pump screw and the inner skin of a pump casing. FIG. 4 is a partially enlarged plan view showing a gap of FIG. It is a figure which shows an example of the stirring member used for the said stirrer part, (a) is a top view, (b) is sectional drawing in the A1-A1 arrow line in (a), (c) is a bottom view. It is a figure which shows the state of the viscous fluid containing the gas which flows in a pipe, (a) is a partial sectional view containing a partial cross section which shows the state of the viscous fluid when it came out of the hopper, (b) is a stirrer part and 2 Partial cross-sectional view including a partial cross-section showing a state of a viscous fluid defoamed and transferred using both functions of a shaft screw pump unit, and (c) shows a function of a twin screw pump unit without using a stirrer unit. FIG. 5 is a partial cross-sectional view including a partial cross-section showing a state of a viscous fluid that has been defoamed and transferred alone. It is a figure which shows the defoaming pump apparatus which concerns on another embodiment of this invention, (a) is a partial side view block diagram, (b) is a partial front block diagram. It is a figure which shows another example of the stirring member used for the said stirrer part, (a) is a top view, (b) is sectional drawing in the A2-A2 arrow line in (a), (c) is a bottom view. . It is a figure which shows the other example of the stirring member used for the said stirrer part, (a) is a top view, (b) is an A3-A3 line view in (a), (c) is A4 in (a). FIG. 4D is a cross-sectional view taken along line A4, and FIG. FIG. 9 is an internal configuration diagram including a partial cross section showing a main part of a stirrer unit using the another stirring member. It is a figure which shows another example of the stirring member used for the said stirrer part, (a) is a top view, (b) is sectional drawing in the A5-A5 line | wire in (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below are merely examples embodying the present invention, and do not limit the technical scope of the present invention. FIG. 1 is a side view showing a defoaming pump device according to an embodiment of the present invention, FIG. 2 is a partial front view showing the defoaming pump device, and FIG. 3 is a main part of the defoaming pump device. 1 is a side view including a partial cross section.
1 to 3, a defoaming pump device 1 according to the present embodiment is supplied to a twin-screw pump unit A that transfers a viscous fluid Q by a pump action of a pair of pump screws, and is supplied to the twin-screw pump unit A. And a stirrer section B that stirs the viscous fluid immediately before the start.

  First, the stirrer unit B includes a vertical cylindrical stirring casing 58, a stirring member 51 provided in the stirring casing 58 for stirring the viscous fluid Q, and a motor MA for rotating and driving the stirring member 51. The viscous fluid Q immediately before being sent to the first viscous fluid intake 18 of the twin screw pump unit A is provided. The agitating casing 58 includes a cylindrical cover 44 surrounding an exposed portion of the motor drive shaft 52A of the motor MA, and a bearing connected to a lower end opening of the cylindrical cover 44 to pivotally support the motor drive shaft 52A from one end side thereof. A bearing cylinder portion 43 for accommodating 46, 46; an intake cylinder portion 42 connected to the lower end opening of the bearing cylinder portion 43; And a flange portion 45 with a tube portion 53 for closing the lower end opening of the stirring cylinder portion 41. The cylindrical cover 44, the bearing holding cylinder 43, and the intake cylinder 42 are fixed to each other with bolts, and the ferrule joint of the intake cylinder 42 and one ferrule joint of the stirring cylinder 41 are fixed with the clamp band 56. Is done. Further, the other ferrule joint of the stirring cylinder 41 and the ferrule joint of the flange 45 are fixed by a clamp band 55, and the ferrule joint of the pipe 53 and the ferrule joint of the pipe 21 of the twin screw pump section A. The part is fixed by the clamp band 54. Thus, the fluid outlet 64 of the pipe 53 and the first viscous fluid intake 18 of the twin screw pump unit A communicate with each other.

  In the agitating casing 58, a pipe 47 having a second viscous fluid inlet 48 for connecting the receiving chamber 49 to the outside is branched and connected to the peripheral wall of the inlet cylinder 42. The ferrule joint part of the vent pipe 21A of the twin screw pump part A is applied to the ferrule joint part of the pipe part 47 of the stirrer part B, and is fixed with a clamp band (not shown). In the middle of the vent pipe 21A, a throttle valve 70 for reducing the amount of the viscous fluid Q to be taken into the stirring casing 58 is provided. Reference numeral 71 in the figure denotes a handle for changing and setting the valve throttle opening of the throttle valve 70. Then, the ferrule joint of the hopper 24 is applied to the other ferrule joint of the vent pipe 21A, and is fixed by a clamp band (not shown). The tip of the rotary drive shaft 52 is connected to the motor drive shaft 52A in the cylindrical cover 44. The rotation drive shaft 52 is rotatably supported by bearings 46 and 46 in the bearing holding tube 43, and the tip of the rotation drive shaft 52 passes through the receiving chamber 49 of the intake tube 42 and the stirring chamber of the stirring tube 41. 50. Then, the tip of the rotary drive shaft 52 is inserted into the shaft connecting portion 60 of the stirring member 51 installed in the stirring chamber 50 of the stirring cylinder portion 41 and is fixed with the bolt 57. The rotation speed of the stirring member 51 is preferably, for example, 600 to 3600 rpm. However, if the rotation speed is too high, a strong centrifugal force or rotational force is applied to the viscous fluid Q, which is not preferable because it causes molecular shearing.

  Next, as shown in FIGS. 4 and 5, the twin-screw pump section A includes a tubular pump casing 2 penetrating back and forth, and a bearing section 5 connected to a rear end of the pump casing 2. , Is provided. A discharge side casing 3 is connected to a front end of the pump casing 2, and a pipe 4 is connected to a front end of the discharge side casing 3. The pump casing 2 accommodates a pair of pump screws 7a and 7b. The front ends of the pump screws 7a, 7b fixed to the shafts 8a, 8b with setscrews or the like are free ends 26, 26 not supported by bearings or the like. The free ends 26, 26 of these pump screws 7a, 7b are provided with fixing plates 14, 14, and are fixed to the shaft portions 8a, 8b by, for example, bolts 15, 15. The spiral direction of the pump screw 7a and the spiral direction of the pump screw 7b are opposite.

  The bearing portion 5 is formed in a box shape from a housing 9 and a cover plate 10, and a cylinder end surface of the pump casing 2 is connected to a front end surface of the cover plate 10. In the housing 9, conical roller bearings 11, 11 and roller bearings 12, 12 are provided. These roller bearings 11 and 12 rotatably support the rear end of the shaft 8a of the pump screw 7a in a cantilever manner. The rear end of the shaft 8b of the pump screw 7b is also rotatably supported in a cantilever manner by another conical roller bearing 11 and another roller bearing 12. That is, the rear portions of the pump screws 7 a and 7 b are rotatably supported at two points in the housing 9. In the housing 9 and in the vicinity of the cover plate 10, seal mechanisms 16, 16 are mounted on the pump screws 7a, 7b. The synchronous gear 13a is fixed to the shaft 8a of the pump screw 7a, and the synchronous gear 13b meshing with the synchronous gear 13a is fixed to the shaft 8b of the pump screw 7b. Due to the synchronous mesh between the synchronous gear 13a and the synchronous gear 13b, the pair of pump screws 7a and 7b mesh with each other at any rotational angle without contact. That is, the pump screws 7a and 7b are screwed and rotated without contact with each other. In this case, for example, the shaft portion 8a of the pump screw 7a is connected to the motor M via a connection mechanism 30 such as a reduction mechanism as a drive shaft.

  The pump casing 2 is formed with a pump chamber 6 having a cocoon shape as viewed from the front, which penetrates forward and backward. A cylindrical discharge-side casing 3 is connected to a front end of the pump casing 2. A tubular tube 4 having a discharge port 19 is connected to a front end of the discharge side casing 3. One end of a vent pipe 34 is connected to the tip of the pipe section 4, and a check valve 36 is connected to the other end of the vent pipe 34. A pipe portion 35 connected to the fluid transfer destination is connected to the outlet side of the check valve 36. The check valve 36 allows the flow of the viscous fluid Q only in the viscous fluid transfer direction (the direction of the black arrow), and is normally closed by the spring elastic force of the spring member. The pump chamber 6 stores a pump screw 7a that rotates around the axis Xa, and a pump screw 7b that rotates around the axis Xb by screwing the pump screw 7a without contact. The outer peripheral surfaces of the pair of pump screws 7a and 7b are always in non-contact with the inner peripheral surface 2A of the pump chamber 6 as described later in detail. On the other hand, a first viscous fluid intake 18 that connects the pump chamber 6 and the stirrer section B is formed on the upper surface of the pump casing 2 and at a position slightly behind the front-rear central portion.

  At the upper surface position of the pump casing 2 surrounding the first viscous fluid intake 18, a pipe portion 21 having a ferrule joint at the upper opening edge is fixed with a bolt or the like, and a stirrer portion B is provided at the upper surface opening of the pipe portion 21. Will be installed. On the other hand, on the ceiling surface at the rear end of the pump chamber 6, a ventilation groove 23 extending left and right is formed so as to be recessed upward. A gas outlet 20 is formed in the pump casing 2 above the ventilation groove 23 to communicate the ventilation groove 23 and the outside above the casing. That is, the gas outlet 20 for extracting gas from the pump chamber 6 is formed in the pump casing 2 on the upstream side of the first viscous fluid intake 18 in the viscous fluid transfer direction. A deaerator 27 for extracting gas from the pump chamber 6 is connected to the gas outlet 20 via a communication passage 29 such as a tube. As the deaerator 27, for example, an air ejector type is used here, but a piston-cylinder type or a centrifugal fan type pressure reducing pump may be used.

  The pair of pump screws 7a and 7b have helical screw teeth formed on the outer peripheral surfaces of cylindrical bases 7A and 7A into which the shafts 8a and 8b are inserted. Then, as shown in FIG. 6A, a gap G is provided between the side surface 7Sa of the screw teeth of the pump screw 7a and the side surface 7Sb of the screw teeth of the pump screw 7b, so that it is always in non-contact. . Further, a gap H is provided between the outer peripheral surface 7B of the screw teeth of each of the pump screws 7a and 7b and the inner peripheral surface 2A of the pump chamber 6 of the pump screw 2 as shown in FIG. Non-contact at all times. That is, these gaps G and H always exist regardless of the position of the pair of pump screws 7a and 7b at any rotational angle. Each of the gaps G and H is set to have a gap width that allows passage of a gas K such as air but does not allow passage of a high-viscosity liquid or a hard / soft solid substance of the viscous fluid Q. In this case, the gap width of the gap G is, for example, 0.03 to 0.09 mm, and the gap width of the gap H is, for example, 0.12 to 0.18 mm. The pump action capable of transferring the viscous fluid Q is caused by the pair of pump screws 7a and 7b within the range of the region P shown in FIGS. Of the range of the region P, the region upstream of the first viscous fluid intake 18 is the range of the region pa shown in FIGS. When the defoaming pump device 1 is for transferring foods, pharmaceuticals, cosmetic materials, and the like, stainless steel parts should be used as parts directly in contact with the viscous fluid Q from the viewpoint of hygiene and maintenance of physical properties of the product. It is desirable to use. The pump capacity of the twin-screw pump section A is, for example, 10 to 120 L / min in rating. However, since the intake amount of the viscous fluid Q is throttled by the throttle valve 70, the actual operation pump capacity is about 2 to 30 L / min.

  On the other hand, as shown in FIG. 7, the agitating member 51 includes a shaft connecting portion 60 that connects the rotary drive shaft 52 connected to the motor drive shaft 52A of the motor MA, and a shaft connecting portion around the axis C. And four rods 62, 62, 62, 62 extending radially outward from the rod 60, and a rod-like member extending downward from the tip of each rod 62 along the axis C of the shaft connecting part 60. And stirring blades 63, 63, 63, 63. The stirring member 51 is fixed with a bolt 57 by inserting the rotary drive shaft 52 into a shaft hole 61 with a key groove of the shaft connecting portion 60. That is, the twin screw pump section A and the stirrer section B are connected to the vertical axis C of the stirring member 51 of the stirrer section B and the horizontal axis Xa of the pump screws 7a and 7b of the twin screw pump section A. , Xbt are arranged at substantially right angles.

  Next, the operation of the defoaming pump device 1 configured as described above will be described. Examples of the high-viscosity viscous fluid Q used for transfer include foods such as miso, syrup, butter, and melted chocolate, cosmetics such as creams and lotions, industrial materials such as melted synthetic resins, and medical materials. . Here, it is preferable to use a high viscosity viscous fluid Q having a relative viscosity of, for example, 1 to 1,000,000 Pa · s. Here, for example, an example is shown in which a 500,000 Pa · s “gel-like lotion as a cosmetic foundation” is used. In the viscous fluid Q, countless bubbles of the gas K are scattered and are stationary with each other (see FIG. 8A). The handling temperature of the viscous fluid Q varies depending on the type of the fluid, and is, for example, about room temperature to about 200 ° C.

  When the pump M is rotated in one direction by the rotation of the motor M, the pump screw B that is transmitted through the synchronous gears 13a and 13b is synchronously rotated in the opposite direction. The rotation speed of the pump screws 7a and 7b is, for example, 100 to 1000 rpm. On the other hand, when the viscous fluid Q is injected into the hopper 24, the viscous fluid Q flows from the hopper 24 into the receiving chamber 49 of the stirring casing 58 via the pipe 21A, the throttle valve 70 and the pipe 47, and continues into the stirring chamber. Flow into 50. In the stirring chamber 50, the viscous fluid Q is stirred by a stirring member 51 that is rotationally driven (for example, 1800 rpm) by a motor MA. In this case, since the upstream side of the stirring casing 58 is throttled by the throttle valve 70, the viscous fluid Q is exposed to a high degree of reduced pressure in the stirring casing 58, and individual bubbles are enlarged. As a result, the gel-like viscous fluid Q itself is easily fluidized. Then, the inflated bubbles collide with each other and unite to have a larger diameter. In other words, the stirrer section B may be configured to be able to perform rotary stirring such that bubbles in the viscous fluid Q immediately before being taken into the twin screw pump section A can collide with each other. Incidentally, since the viscous fluid Q moves in the stirring chamber 50 of the stirring cylinder 41 in the direction of the axis C of the stirring member 51, the stirring of the viscous fluid Q by the stirring member 51 is not due to the centrifugal force, but This is due to the simple rotational force of the extending arm 62 and the stirring blade 63.

  The viscous fluid Q thus stirred by the stirrer section B falls from the fluid outlet 64 into the pipe section 21 and into the first viscous fluid inlet 18 of the pump casing 2. However, when the deaerator 27 is stopped or when the degree of decompression by the deaerator 27 is small (for example, about -0.005 MPa), the pump screws 7a and 7b are driven to rotate even though they are rotating. Most of the viscous fluid Q remains at the position of the first viscous fluid intake 18 and only a small amount enters the pump chamber 6. Therefore, when the deaerator 27 is driven normally, the gas K (mostly air) in the pump casing 2 is extracted from the gas outlet 20 and the pressure in the pump chamber 6 decreases. When the inside of the pump chamber 6 reaches a certain degree of pressure reduction (for example, −0.01 MPa), the viscous fluid Q that has been staying at the position of the first viscous fluid intake 18 until now suddenly enters the pump chamber 6. Inhaled. The degree of pressure reduction by the deaerator 27 is, for example, -0.01 to -0.04 MPa (complete vacuum = -0.1 MPa). As a result, the viscous fluid Q is sent toward the discharge side casing 3 by the pump action of the pump screws 7a and 7b (in the direction indicated by the black arrow F).

  In this case, the viscous fluid Q has been once fluidized by the stirrer unit B, and the gas K gas bubbles have a large diameter due to the presence of the throttle valve 70. Since the air is evacuated, the large bubbles in the stirring casing 58 flow through the viscous fluid Q in the pump chamber 6 in the direction opposite to the viscous fluid transfer direction (the direction of the black arrow F) (the direction of the white arrow). (Ie, toward the upstream side in the transfer direction). At this time, the gas K flows into the gap H between the inner peripheral surface 2A of the pump casing 2 and the outer peripheral surfaces 7B of the pump screws 7a and 7b (see FIG. 6B) and the side surface 7Sa of the pump screw 7a and the pump screw 7b. After passing through the gap G (see FIG. 6A) with the side surface 7Sb, it moves backward in the region pa. Thereafter, the moved gas K is sucked out from the gas outlet 20 through the communication passage 29 by the action of the deaerator 27 and discharged out of the machine. Thus, the viscous fluid Q from which the gas K has been largely removed is sent out from the discharge port 19 to the check valve 36. The check valve 36 closed by the spring member opens when the pressure on the input side reaches a positive pressure, for example, 0.05 MPa, against the spring elastic force of the spring member, and the viscous fluid Q is piped. Send it to the unit 35. The viscous fluid Q from the pipe section 35 is sent to, for example, a small-capacity filling machine for filling cosmetics.

  As shown in FIG. 8B, the viscous fluid Q sent out from the check valve 36 contained almost no gas K, and the presence of air bubbles could not be confirmed with the naked eye. As described above, the viscous fluid Q in which almost no air bubbles are observed has an apparent specific gravity higher than that of the conventional fluid which contains many fine air bubbles, and furthermore, the variation in the detected specific gravity value is extremely small, and the component is oxidized and deteriorated. It can prevent it. Therefore, it was possible to greatly contribute to stabilization of product quality. As a result, an extremely suitable device can be provided as the defoaming and transferring device 1 for cosmetics packed in small quantities in small product containers.

  Incidentally, when the viscous fluid Q from the hopper 24 is directly introduced into the pump casing 2 through the first viscous fluid intake 18 from the pipe portion 21 without using the stirrer portion B, bubbles having a large diameter are not generated. 8 (see FIG. 8A) is directly taken into the pump casing 2, so that the amount of the gas K exhausted from the pump casing 2 by the deaerator 27 does not increase so much. Therefore, as shown in FIG. 8C, the viscous fluid Q discharged from the pipe portion 35 after defoaming has an extremely small diameter and a small amount of gas K1, K1, K1,. It becomes a jelly-like thing.

  As described above, according to the defoaming pump device 1 of this embodiment, the pump casing upstream of the first viscous fluid inlet 18 in the viscous fluid transfer direction (opposite to the black arrow F direction). 2 is provided with a gas outlet 20 and a deaerator 27 is connected to the gas outlet 20, so that the gas in the viscous fluid Q is separated from the viscous fluid Q by the suction action of the deaerator 27, The gas can be discharged from the gas outlet 20 through the gap G between the pump screws 7a and 7b and the gap H between the pump screw 7a or the pump screw 7b and the inner peripheral surface 2A of the pump chamber 6. On the other hand, the viscous fluid Q cannot pass through the gaps G and H, so that the viscous fluid Q can be pumped toward the discharge port 19 by the pumping action of the pump screws 7 a and 7 b in the pump chamber 6. Accordingly, the defoaming pump device 1 can transfer the viscous fluid Q while separating the gas K, and also generates metal wear powder because the pump screws 7a and 7b and the inner peripheral surface 2A of the pump casing 2 are not in contact with each other. Thus, a pump device suitable for transferring foods, medical products, and the like can be provided which does not give a shearing force to the viscous fluid Q and does not change the quality as when receiving the centrifugal force of the centrifugal pump. Further, since the check valve 36 is provided on the outlet side of the discharge port 19 of the pump casing 2, even if the viscous fluid Q is from a position below the first viscous fluid intake 18 of the pump casing 2, the check valve is not checked. By the action of the valve 36, the water can be sucked into the pump chamber 6.

In the defoaming pump device 1, the stirrer unit B having the throttle valve 70 is provided especially on the inlet side of the twin screw pump unit A, so that the viscous fluid Q immediately before being taken into the pump casing 2 is stirred. In the part B, the stirring can be performed without using the centrifugal force. Thus, the bubbles of the gas K in the viscous fluid Q can be enlarged and collided, and the flow of the viscous fluid Q itself can be started accordingly. Therefore, the viscous fluid Q taken into the pump casing 2 is a viscous fluid Q having such a property that the bubbles are difficult to move since the bubbles having a large diameter easily move toward the gas outlet 20 in the pump casing 2. However, the gas K can be reliably and highly extracted from the viscous fluid Q. Incidentally, when the viscous fluid is discharged and gas-liquid separated while receiving a large shear force due to centrifugal force in the casing, if the viscous fluid is a viscous fluid mainly containing a polymer compound or the like, the above-described shear force There is a risk that the polymer chains will be broken and the physical properties of the viscous fluid will be altered. When such a configuration is employed, it is not suitable for transferring foods and cosmetics containing a large amount of a high molecular compound.
On the other hand, the viscous fluid Q moving in the direction of the axis C in the stirring casing 58 is stirred by the stirring blade 63 extending in the direction of the axis C, so that the time during which the stirring blade 63 is in contact with the viscous fluid Q is extended. Can be held. Accordingly, since the viscous fluid Q can be fluidized and the collision of bubbles can be promoted, degassing can be improved.

In the above-described embodiment, the axis C of the stirring member 51 of the stirrer section B is oriented vertically, and the axes Xa, Xb of the pump screws 7a, 7b of the twin screw pump section A are substantially perpendicular to the stirrer section B. Although the example in which the stirrer section B and the twin screw pump section A are arranged so as to be in the horizontal direction is shown, the defoaming pump device of the present invention is not limited thereto. For example, a defoaming pump device as shown in FIG. 9 is also included in the present invention. In this defoaming pump device, the stirrer is arranged such that the axis C of the stirrer 51 of the stirrer section B is parallel to the axes Xa and Xb of the pump screws 7a and 7b of the twin screw pump section A. The section B and the twin screw pump section A are arranged. In this case, the pipe section 53 of the stirrer section B and the pipe section 21 of the twin screw pump section A are connected by a bent pipe 59 bent at 90 degrees, and a horizontal base is attached to the cylindrical cover 44 of the stirring casing 58. The base 65 is attached by bolts or the like, and the base 65 is fixed to a horizontal support base (not shown).
Since the stirrer section B and the twin-screw pump section A are arranged in parallel with each other with their axes in the horizontal direction, the height of the entire apparatus is reduced, so that the space in the vertical direction can be saved. Can be planned. In addition, even with such a configuration, there is no difference in defoaming performance and pump performance from the defoaming pump device 1 shown in FIG.

  On the other hand, in the above-described stirring member 51 of the stirrer unit B, the stirring blade 63 extending in the direction of the axis C is extended at the tip of the plurality of extending arms 62, but the stirring member of the present invention is Not limited. For example, a stirring member 51a as shown in FIG. 10 is also included in the present invention. The stirring member 51a includes only four extending arms 62a extending radially outward from the shaft connecting portion 60, but does not include the stirring blade 63 like the stirring member 51. Even with the agitating member 51a having such a configuration, the viscous fluid Q immediately before being taken into the pump casing 2 flows in the direction of the axis C and is agitated without centrifugal force, because the rotating arm 62a rotates. This can help the defoaming function in the twin screw pump section A, though not as much as the stirring member 51.

  Further, as the stirring member of the present invention, a stirring member 51b as shown in FIG. 11 may be used. In the stirring member 51b, a cylindrical portion 66 is vertically provided at a lower end of a shaft connecting portion 60 having a shaft hole 61, and four stirring blade portions 63a, 63a, 63a are provided on outer surfaces of the shaft connecting portion 60 and the cylindrical portion 66. , 63a project outward. Openings 65, 65, 65, 65 for passing the viscous fluid Q to the pipe 53 are formed between adjacent stirring blades 63 a, 63 a at the lower end of the cylindrical portion 66. The stirring member 51b is provided in the stirring chamber 50 of the stirrer unit shown in FIG. In this example, when the stirring member 51b rotates, the viscous fluid Q that has flowed into the stirring chamber 50 from the receiving chamber 49 of the stirrer unit B passes through the outside of the cylindrical portion 66, and is generated by the wide-area stirring blade portions 63a. Stir for a relatively long time. Thereafter, the viscous fluid Q passes through the cylindrical portion 66 from the openings 65, 65, 65, 65 for a short time, and is taken into the pump casing 2 via the fluid outlet 64 of the tube 53. When the stirring member 51b is used, the viscous fluid Q is sufficiently stirred and bubbles are gathered to increase the diameter, so that the efficiency is higher than that of the stirring member 51 or the stirring member 51a described above, and the twin screw pump unit is used. It greatly helps A's defoaming function.

  Further, a stirrer unit using a stirrer 51c as shown in FIG. 13 is also included in the present invention. The stirring member 51c is different from the above-described structure of the stirring member 51b in that the stirring member 51c does not include the cylindrical portion 66 inside the stirring blade portions 63a, 63a, 63a, 63a. The viscous fluid Q is also stirred for a long time by the stirring blade 63a having a large area by the stirrer unit using the stirring member 51c, so that the defoaming performance of the twin screw pump unit A can be assisted.

  The present invention is not limited to the above-described embodiment, and departs from the gist of the present invention, including various modifications and corrections, which can be conceived by those having ordinary knowledge in the field of the present invention. Of course, even if there is a design change within a range not to be included, the present invention is included in the present invention.

A Twin screw pump section B Stirrer section 1 Defoaming pump device 2 Pump casing 2A Inner peripheral surface 6 Pump chamber 7a, 7b Pump screw 7Sa, 7Sb Side surface 7B Tip surface 18 First viscous fluid inlet 19 Discharge port 20 Gas outlet 24 Hopper 27 Deaerator 29 Communication path 36 Check valve 48 Second viscous fluid inlet 50 Stirring chamber 51, 51a, 51b, 51c Stirring member 52 Rotation drive shaft 58 Stirring casing 60 Shaft coupling 62, 62a, 62b Portion 63, 63a Stirring blade portion 64 Fluid outlet 70 Throttle valve C Shaft center F Arrow G, H Gap K Gas Q Viscous fluid

Claims (3)

A pair of pump screws which are screwed and rotated in non-contact with each other, a cylindrical pump casing accommodating the pair of pump screws in non-contact, and a first viscous fluid inlet provided in the middle of the cylinder of the pump casing A discharge port provided on the distal end side of the pump casing, a gas vent provided on the pump casing at a distal end side from the first viscous fluid intake, and a degassing device connected to the gas vent. A gap is formed between the side surfaces of the pair of pump screws, and between the distal end surface of each pump screw and the inner peripheral surface of the pump casing, which allows gas to pass therethrough and does not allow viscous fluid to pass therethrough. A twin screw pump section,
A stirrer unit connected to the inlet side of the first viscous fluid intake of the twin screw pump unit and agitating the viscous fluid sent to the first viscous fluid intake of the twin screw pump unit. Have been
The stirrer section includes a cylindrical stirring casing, a second viscous fluid intake port provided in the stirring casing, and a first viscous fluid inlet port provided in the axial end of the stirring casing. A fluid outlet connected to the fluid inlet, a stirring member provided in the stirring casing, rotatably driven around the axis of the stirring casing and stirring the viscous fluid, and connected to the second viscous fluid inlet; And a throttle valve for reducing the amount of viscous fluid taken in from the outside. The stirring member has a shaft connecting portion to which a rotary drive shaft is connected, an extended arm portion extending radially outward from the shaft connecting portion, and an axial direction of the shaft connecting portion from a tip of the extended arm portion. 2. The defoaming pump device according to claim 1, further comprising: a stirring blade portion extending along the edge. The twin-screw pump section includes a first viscous fluid intake port provided at an upper portion of the pump casing, and a check valve that allows the viscous fluid to flow only in the viscous fluid transfer direction. Is connected to the outlet side of the discharge port, and when the pressure of the discharge port exceeds a preset pressure preset in the check valve, the check valve opens to allow the viscous fluid to flow. The defoaming pump device according to claim 1 or 2, wherein the defoaming pump device is configured as follows.

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