JP2021017890A - Two-axis screw pump - Google Patents

Abstract

To provide a two-axis screw pump capable of deaerating even highly viscous fluid sufficiently, as well as preventing the viscous fluid to be transferred from being degenerated or component abrasion powder from being mixed.SOLUTION: A two-axis screw pump 1 is a rotary component non-contact type pump comprising a pair of pump screws, a cylindrical pump casing 2, a viscous fluid intake port 18 of the pump casing 2, a viscous fluid discharge port 19 of the pump casing 2, a gas outlet 20 provided in the pump casing 2, and a deaerator 27. The viscous fluid intake port 18 of the pump casing 2 is provided with a dispersion member 40 (example of surface area increasing means 77) in which viscous fluid Q is diverted and then flows into the pump casing 2.SELECTED DRAWING: Figure 1

Description

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

Conventionally, as a twin-screw pump of this type, the one described in Patent Document 1 below is known. The twin-screw pump described in the document is a twin-screw pump with a degassing device, and as shown in FIGS. 5 and 6 in Patent Document 1, side surfaces 7Sa, 7Sb of a pair of pump screws 7a, 7b. Gap G and H are formed between the spaces and between the tip surfaces 7B and 7B of the pump screws 7a and 7b and the inner peripheral surface 2A of the pump casing, respectively, which allow gas such as air to pass through but not viscous fluid. .. In this device, the viscous fluid is transferred while discharging the gas in the viscous fluid to the outside by driving the degassing device connected to the gas outlet of the pump casing, and a pair of non-contact with each other. Although it is a positive displacement pump having pump screws 7a and 7b, it has a function of discharging gas from a viscous fluid and transferring it.

JP-A-2015-55179

However, the twin-screw pump described in Patent Document 1 described above is used when a large number of bubbles are scattered in a dispersion medium and a highly viscous viscous fluid that is stable and stationary with each other is transferred. Since the viscous fluid is transferred in the spiral space of the pump chamber while being held in its space shape and hardly losing its shape, it is difficult for bubbles to move in the viscous fluid, and the bubbles partially remain. There was a problem that it could not be completely degassed.

The present invention has been made in view of the above-mentioned conventional problems, and even if the viscous fluid is so viscous that the bubbles are stationary and difficult to move, the original degassing ability is complemented. An object of the present invention is to provide a twin-screw pump capable of more advanced degassing.

In order to achieve the above object, the twin-screw pump according to the present invention is a tubular pump that houses a pair of pump screws that are screwed and rotationally driven in a non-contact manner with each other and a pair of pump screws that are housed in a non-contact manner. The casing, the viscous fluid intake provided in the middle of the pump casing in the axial direction, the viscous fluid discharge port provided on the tip side of the pump casing, and the end side of the upper surface of the pump casing from the viscous fluid inlet. A degassing device connected to the gas vent and the degassing device provided in the pump screw, 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. A biaxial screw pump in which a gap that allows gas to pass through and does not allow viscous fluid to pass through is formed between the pumps. The surface area of the viscous fluid per unit volume is increased at the viscous fluid intake of the pump casing. It is characterized in that it is provided with a means for increasing the surface area to flow into the casing.

Further, in the above configuration, the surface area increasing means is composed of a dispersion member that divides the viscous fluid and then flows it into the pump casing in order to limit the flow rate of the viscous fluid taken in from the viscous fluid intake. It is a feature.

Further, in the above configuration, the dispersion member includes a plate-shaped main body that covers the viscous fluid intake, and a plurality of passage holes formed through the plate-shaped main body so that the viscous fluid can pass through. It is characterized in that the viscous fluid is configured to flow into the pump casing after passing through a plurality of passage holes.

Then, in the above configuration, the dispersion member is viscous between the plate-shaped body that covers the viscous fluid intake, the valve seat hole formed by penetrating the plate-shaped body from the front and back, and the inner peripheral surface of the valve seat hole. It is provided with a valve body arranged with a passage gap through which the fluid can pass, and a fixing member for fixing the valve body to the plate-like body, and the pump is provided after the viscous fluid has passed through the passage gap. It is characterized in that it is configured to flow into the casing.

Further, in the above configuration, the outer peripheral surface of the valve body is closely separated from the inner peripheral surface of the valve seat hole to provide a clearance variable mechanism for varying the size of the passage clearance. ..

Further, in the above configuration, the surface area increasing means narrows the viscous fluid taken in from the viscous fluid intake to a flow path cross-sectional area smaller than the flow path cross-sectional area of the viscous fluid intake, and then flows the viscous fluid into the pump casing. It is characterized in that it is composed of a drawing member.

Then, in the above configuration, the fluid drawing member includes a ring-shaped plate-shaped main body that covers the viscous fluid intake, a bottomed tubular tubular body portion that is vertically provided on the inner peripheral edge of the plate-shaped main body, and a tubular body portion. It is provided with a passage hole having an opening area smaller than the flow path cross-sectional area of the tubular body, which is formed so as to penetrate vertically through the bottom surface of the cylinder, and the viscous fluid in the tubular body has passed through the passage hole. It is characterized in that it is configured to flow into the pump casing later.

Further, in the above configuration, the passage hole of the tubular body portion is formed in a slit shape, and the passage hole is axially centered in the pump casing in the longitudinal direction of the slit in a state where the fluid drawing member is arranged at the viscous fluid intake. It is characterized in that it is arranged so as to be arranged in a direction perpendicular to the above.

The twin-screw pump according to the present invention is a positive displacement pump containing a pair of pump screws that are not in contact with each other, and is provided with a surface area increasing means at the viscous fluid intake, so that the viscous fluid taken in increases the surface area. After the surface area per unit volume is increased by means, it is sent into the pump casing. Therefore, the increased surface area makes it easier for bubbles to be extracted from the viscous liquid, and more bubbles can be extracted from the gas outlet. As a result, a higher degree of degassing can be performed by complementing the original degassing ability.

Further, in the case where the surface area increasing means is composed of a dispersion member, the viscous fluid flowing into the viscous fluid intake is separated by the dispersion member and sent into the pump casing after the flow rate is restricted. At this time, since the total opening area of the plurality of passage holes is smaller than the flow path cross-sectional area of the viscous fluid intake, the surface area of the viscous fluid flowing in per unit time passes through the plurality of passage holes. It gets bigger before and after. Due to these, the viscous fluid is fluidized and the collision of the bubbles in the viscous fluid is promoted to increase the diameter of the bubbles. Therefore, the bubbles can be easily moved toward the gas outlet and the increased surface area. This allows more air bubbles in the viscous fluid to be degassed.

Further, if the dispersion member is provided with a plate-shaped main body that covers the viscous fluid intake and a plurality of passage holes formed in the plate-shaped main body, a plurality of dispersion members are provided, although the configuration is extremely simple and inexpensive. The viscous fluid can be reliably dispersed in the passage holes, and a high degree of degassing can be performed.

Then, the dispersion member is arranged between the plate-shaped body that covers the viscous fluid intake, the valve seat hole formed in the plate-shaped body, and the inner peripheral surface of the valve seat hole, and the valve body. In the case of a device provided with a fixing member for fixing the viscous fluid to the plate-like body, a gap for passing the viscous fluid can be provided between the valve seat hole and the valve body, and the viscous fluid is allowed to pass through this passing gap. Therefore, the viscous fluid can be dispersed and highly degassed.

Further, in the case of a device provided with a clearance variable mechanism for changing the passage gap between the outer peripheral surface of the valve body and the inner peripheral surface of the valve seat hole, the outer peripheral surface of the valve body is separated from the inner peripheral surface of the valve seat hole. Since the size of the passing gap is made variable, the size of the passing gap can be changed to an appropriate size that matches the viscosity of the viscous fluid, so the viscous fluid can be degassed with an appropriate degassing ability. Can be done.

Further, in the above configuration, in the case where the surface area increasing means is composed of the fluid drawing member, the viscous fluid flowing into the viscous fluid intake is from the flow path cross-sectional area of the viscous fluid intake by the passage hole of the fluid drawing member. Since it is narrowed down to a small flow path cross-sectional area, the surface area of the viscous fluid that has passed through the passage hole becomes large. As a result, much degassing can be performed from the viscous fluid.

In the above configuration, the fluid drawing member includes a plate-shaped main body that covers the viscous fluid intake, a bottomed tubular body portion, and a passage hole formed in the bottom surface portion of the tubular body portion. Although the structure is simple and inexpensive, the surface area of the viscous fluid taken in by squeezing the viscous fluid through the passage holes can be increased, and a high degree of degassing can be performed.

Further, in the above configuration, if the passage hole of the tubular body portion is formed in a slit shape and the passage hole is arranged so that the longitudinal direction of the slit is oriented in the direction perpendicular to the axial center of the pump casing, the passage hole is used. Since the distance from any position of the hole is substantially the same as that of the gas outlet, degassing from the viscous fluid can be efficiently performed regardless of the passing position in the passage hole.

It is a side view which shows the biaxial screw pump which concerns on Embodiment 1 of this invention. It is a front view which shows the two-screw pump. It is an internal plan view including a partial cross section of the twin-screw pump. It is an internal block diagram of the twin-screw pump, and is the cross-sectional view taken along the line AA in FIG. It is a figure for demonstrating the gap in the biaxial screw pump, (a) is a partially enlarged plan view which shows the gap between a pair of pump screws, and (b) is the space between the pump screw and the inner peripheral surface of a pump casing. It is a partially enlarged plan view which shows the gap of. It is a side view including the partial cross section which disassembled the main part of the twin-screw pump. It is a figure which shows the dispersion member of the twin-screw pump, (a) is a plan view, (b) is a sectional view taken along the line BB in (a). (A) is an X-ray image of the fish sausage obtained by the 2-axis screw pump of the first embodiment, and (b) is an X-ray image of the fish sausage obtained by the conventional 2-axis screw pump. Is. (A) is a partial plan view of the fish sausage obtained by the two-screw pump of the first embodiment and expanded in half, and (b) is the body of the fish sausage obtained by the conventional two-screw pump. It is a partial plan view which is divided in half and expanded. It is a figure which showed the dispersion member of the biaxial screw pump, (a) is a plan view of the dispersion member used in Embodiment 1, (b)-(d) is a modification of the dispersion member of (a). It is a top view which shows each of the dispersion members which were gradually reduced in hole width. (A) to (d) are plan views showing examples of other dispersion members that can be used for the twin-screw pump. It is a partial side view including a partial cross section which shows the main part of the twin-screw pump which concerns on Embodiment 2 of this invention. It is a figure which shows the component part of the 2 shaft screw pump of Embodiment 2, (a) shows a valve body, (1) is a plan view, (2) is a side view, (3) is a bottom view, (b). ) Indicates a fixing member, (1) is a plan view, (2) is a cross-sectional view taken along the line CC in (1), (3) is a bottom view, and (c) is a plate-like body. (1) is a plan view, and (2) is a cross-sectional view taken along the line DD in (1). It is a partial side sectional view for demonstrating the operation of the main part in the twin-screw pump of Embodiment 2. It is a figure which shows the fluid drawing member used for the twin-screw pump which concerns on Embodiment 3 of this invention, (a) is the perspective view which looked up from diagonally below, (b) is the perspective view which looked down from diagonally above. is there. It is a figure which shows the fluid drawing member of the biaxial screw pump of Embodiment 3, (a) is a plan view, (b) is the sectional view taken along the line EE in (a), (c) is (a). It is a cross-sectional view taken along the line FF in. It is an exploded rear view including the main part parts of the twin-screw pump of Embodiment 3. FIG. 17 is a cross-sectional view taken along the line RR in FIG. 17 of the twin-screw pump of the third embodiment. It is a rear view which shows the state which the main part part of the 2 shaft screw pump of Embodiment 3 is assembled. It is a figure which shows the fluid drawing member used for the twin shaft screw pump which concerns on Embodiment 4 of this invention, (a) is a plan view, (b) is a side view of GG line arrow in (a), ( c) is a cross-sectional view taken along the line OH in (a), and (d) is a cross-sectional view taken along the line I-I 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 that embody the present invention, and do not limit the technical scope of the present invention. Here, FIG. 1 is a side sectional view showing a twin-screw pump according to the first embodiment of the present invention, FIG. 2 is a partial front sectional view showing the twin-screw pump, and FIG. 3 is a main part of the twin-screw pump. 4 is an internal configuration diagram of the twin-screw pump of the twin-screw pump, and is a sectional view taken along the line AA in FIG.

"Implementation 1."
In FIGS. 1 to 4, the biaxial screw pump 1 according to the first embodiment includes a tubular pump casing 2 penetrating the front and rear, and a bearing portion 5 connected to the rear end portion of the pump casing 2. There is. A discharge side casing 3 is connected to the front end portion of the pump casing 2, and a pipe portion 4 is connected to the front end portion of the discharge side casing 3. A pair of pump screws 7a and 7b are housed in the pump casing 2. The front ends of the pump screws 7a and 7b fixed to the shafts 8a and 8b with set screws and the like are idle ends 26 and 26 that are not supported by bearings or the like. The idle ends 26, 26 of these pump screws 7a, 7b are assigned 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 of a housing 9 and a cover plate 10 in a box shape, and the cylindrical end surface of the pump casing 2 is connected to the front end surface of the cover plate 10. Conical roller bearings 11 and 11 and roller bearings 12 and 12 are arranged in the housing 9. These roller bearings 11 and 12 rotatably support the rear end portion of the shaft portion 8a of the pump screw 7a in a cantilever shape. The rear end of the shaft portion 8b of the pump screw 7b is also rotatably supported in a cantilever shape by another conical roller bearing 11 and a roller bearing 12. That is, the rear sides of the pump screws 7a and 7b are freely rotatably supported at two points in the housing 9. Sealing mechanisms 16 and 16 are mounted on the pump screws 7a and 7b in the housing 9 in the vicinity of the cover plate 10. A synchronous gear 13a is fixed to the shaft portion 8a of the pump screw 7a, and a synchronous gear 13b that meshes with the synchronous gear 13a is fixed to the shaft portion 8b of the pump screw 7b. Due to the synchronous meshing of the synchronous gear 13a and the synchronous gear 13b, the pair of pump screws 7a and 7b perform pseudo meshing without contacting each other at any rotation angle. That is, the pump screws 7a and 7b are screwed together in a non-contact manner and rotate. In this case, for example, the shaft portion 8a of the pump screw 7a is connected to the motor M as a drive shaft via a connection mechanism 30 such as a reduction mechanism.

The pump casing 2 is formed by the front-view cocoon-shaped pump chamber 6 penetrating the front and rear. A tubular discharge-side casing 3 is connected to the front end of the pump casing 2. A tubular pipe portion 4 having a viscous fluid discharge port 19 is connected to the front end portion of the discharge side casing 3. One end of the vent pipe 34 is connected to the tip of the pipe portion 4, and the 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 exit side of the check valve 36. The check valve 36 allows the viscous fluid Q to flow only in the viscous fluid transfer direction (the direction indicated by the black arrow), and the valve is normally closed by the spring elastic force of the spring member. In the pump chamber 6, a pump screw 7a that rotates around the axis Xa and a pump screw 7b that is always screwed with the pump screw 7a in a non-contact manner and rotates around the axis Xb are stored. 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 will be described in detail later. On the other hand, a viscous fluid intake 18 that communicates the pump chamber 6 and the hopper 24 is formed on the upper surface of the pump casing 2 at a position slightly rear of the front and rear central portions.

Further, a flange receiving portion 50 is formed at a position on the upper surface of the pump casing 2 surrounding the viscous fluid intake 18. The inside of the flange receiving portion 50 connecting the viscous fluid intake port 18 and the pump chamber 6 is an introduction path 86 for taking the viscous fluid Q from the pipe portion 21 into the pump chamber 6. The flange of the pipe portion 21 is fixed to the flange receiving portion 50 with bolts 51. Then, the ferrule joint portion of the pipe portion 21 and the ferrule joint portion on the lower side of the pipe portion 53 are fixed by the clamp band 54, and the ferrule joint portion of the hopper 24 is applied to the ferrule joint portion on the upper side of the pipe portion 53. It is fixed with a clamp band (not shown). As a result, the hopper 24 and the viscous fluid intake 18 communicate with each other. On the other hand, a ventilation groove 23 extending to the left and right is formed by being recessed upward on the ceiling surface at the rear end of the pump chamber 6. The pump casing 2 located above the ventilation groove 23 is formed with a gas outlet 20 that communicates the ventilation groove 23 with the outside above the casing. That is, a gas outlet 20 for extracting gas in the pump chamber 6 is formed in the pump casing 2 on the upstream side in the viscous fluid transfer direction with respect to the viscous fluid intake 18. A degassing device 27 for extracting gas in the pump chamber 6 is connected to the gas outlet 20 via a communication passage 29 such as a pipe material. As the degassing device 27, for example, an air ejector type is used here, but a piston / cylinder type or centrifugal fan type decompression pump may be used.

The pair of pump screws 7a and 7b have spiral screw teeth formed on the outer peripheral surfaces of the cylindrical base portions 7A and 7A through which the shaft portions 8a and 8b are inserted. Then, as shown in FIG. 5A, a gap G is provided between the side surface 7Sa of the screw tooth of the pump screw 7a and the side surface 7Sb of the screw tooth of the pump screw 7b so that they are not in contact with each other at all times. .. Further, as shown in FIG. 5B, a gap H is provided between the outer peripheral surface 7B of the screw teeth of the pump screws 7a and 7b and the inner peripheral surface 2A of the pump chamber 6 of the pump screw 2. It is always non-contact. That is, no matter what rotation angle the pair of pump screws 7a and 7b are located at, these gaps G and H are always present. Both of the above-mentioned gaps G and H are set to a gap width that allows gas K such as air to pass through, but does not allow high-viscosity liquids of viscous fluid Q and hard / soft solids to pass through. 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 pair of pump screws 7a and 7b causes a pumping action capable of transferring the viscous fluid Q within the range of the region P shown in FIGS. 3 and 4. Within the range of this region P, the range on the upstream side of the viscous fluid intake 18 is the range of the region pa shown in FIGS. 3 and 4. When the twin-screw pump 1 is for transferring foods, pharmaceuticals, cosmetic materials, etc., stainless steel parts should be used as parts that come into direct contact with the viscous fluid Q from the viewpoint of hygiene and maintenance of commercial properties. It is desirable to use it. The pump capacity of the twin-screw pump 1 is rated, for example, 10 to 120 L / min.

On the other hand, in the twin-screw pump 1, as shown in FIG. 6, a dispersion member 40, which is an example of the surface area increasing means 77, is provided on the entrance side of the viscous fluid intake 18 of the pump casing 2. As shown in FIG. 7, the dispersion member 40 is recessed downward from the upper surface of the plate into the disk-shaped plate-shaped main body 42 that covers the viscous fluid intake 18 of the pump casing 2 and the plane central portion of the plate-shaped main body 42. 41, 41, 41, ..., And a plate-shaped main body, which are formed through the step portion 44 and a plurality of passage holes 41, 41, 41, ... It is formed on the peripheral edge of 42 and is composed of bolt insertion holes 43, 43, 43, 43 through which the bolt 51 is passed. The thickness t of the dispersion member 40 is, for example, 5 mm. In this case, the total number of passage holes 41, 41, 41, ... Is larger than the flow path cross-sectional area A [(diameter L / 2) ² · π] in the pipe of the pipe portion 21 or the viscous fluid intake 18. The opening area B (flow path cross-sectional area) [hole width Y × (total longitudinal dimensions of each passage hole 41)] is smaller.

The operation of the twin-screw pump 1 configured as described above will be described below. The highly viscous viscous fluid Q used for transfer includes, for example, fish meat sausage raw materials, miso, starch syrup, butter, foods such as molten chocolate, cosmetics such as creams and lotions, industrial materials such as molten synthetic resins, and medical materials. And so on. As the viscous fluid Q having a high viscosity, a fluid having a relative viscosity of, for example, 1 to 1 million Pa · s can be used. The handling temperature of the viscous fluid Q varies depending on the type of fluid, but is, for example, about room temperature to 200 ° C. Here, an example using "fish sausage raw material before casing filling" having a relative viscosity of, for example, 1 million Pa · s is shown. A large number of bubbles 73, 73, 73, ... Are scattered and stationary in the viscous fluid Q (see FIG. 1) in the hopper 24.

When the pump screw 7a rotates in one direction due to the rotational drive of the motor M, the pump screw 7b whose power is transmitted via the synchronous gears 13a and 13b rotates synchronously in the opposite direction. The rotation speeds of the pump screws 7a and 7b are, for example, 100 to 1000 rpm. On the other hand, when the viscous fluid Q is thrown into the hopper 24, the viscous fluid Q flows from the hopper 24 into the pipe portion 21 via the pipe portion 53. After that, the viscous fluid Q of the pipe portion 21 separately flows in while the flow rate is restricted by the plurality of passage holes 41, 41, 41, ... Of the dispersion member 40, and the passage holes 41, 41, 41, ... After passing through, the inflowing viscous fluids N, N, N, ... (See FIG. 7B) are rejoined before the viscous fluid intake 18. In this case, (unit volume referred to in the present invention) viscosity flowing per unit time of the fluid Q in the tube unit 21 is calculated by [(diameter L / ²⁾ 2 · π · inflow length J], the tube portion 21 Since the total opening area B of the passage holes 41, 41, 41, ... Is smaller than the flow path cross-sectional area A in the pipe, the inflow length J1 of the inflow viscous fluid N flowing in from each passage hole 41 is It becomes longer than the inflow length J of the viscous fluid Q. As a result, the surface area per unit volume of the inflowing viscous fluid N is higher than the surface area [L · π · J] per unit volume of the viscous fluid Q [(2. (Hole width Y of each passage hole 41 + hole longitudinal dimension). The sum of J1)] is wider.

The viscous fluid Q thus dispersed by the dispersion member 40 and rejoined flows into the pump chamber 6 of the pump casing 2 through the viscous fluid intake port 18. On the other hand, by driving the degassing device 27, the gas (mostly air) in the pump casing 2 is extracted from the gas outlet 20, and the pressure in the pump chamber 6 is reduced. At this time, the degree of decompression by the degassing device 27 is, for example, −0.01 to −0.04 MPa (by the way, complete vacuum = −0.1 MPa). On the other hand, the viscous fluid Q is sent toward the discharge side casing 3 by the pumping action of the pump screws 7a and 7b (black arrow F direction).

In this case, the viscous fluid Q once splits through the passage holes 41, 41, 41, ... Of the dispersion member 40, and then rejoins. Since the inside of the pump chamber 6 is evacuated by the degassing device 27, the bubbles that have passed through the dispersion member 40 and become large particles pass through the viscous fluid Q in the pump chamber 6 in the viscous fluid transfer direction (painted in black). It easily moves in the direction opposite to the direction of the arrow F (the direction of the white arrow, that is, toward the upstream side in the transfer direction). At this time, even fine air bubbles are also contained in the gap H between the inner peripheral surface 2A of the pump casing 2 and the outer peripheral surface 7B of the pump screws 7a and 7b (see FIG. 5B), and the side surface 7Sa and the pump screw 7b of the pump screw 7a. It passes through the gap G (see FIG. 5A) with the side surface 7Sb of the above and moves backward in the region pa. After that, the moved air bubbles are sucked out from the gas outlet 20 through the communication passage 29 by the action of the degassing device 27 and discharged to the outside of the machine. As a result, the viscous fluid Q from which the gas has been largely removed is sent out from the viscous fluid discharge port 19 to the check valve 36. The check valve 36, which was closed by its own spring member, opens against the spring elastic force of the spring member when the pressure on the inlet side reaches a positive pressure of, for example, 0.05 MPa, and the viscous fluid Q Is sent to the pipe portion 35. The viscous fluid Q from the pipe portion 35 is sent as a fish meat material to, for example, a filling machine for filling the sausage casing.

The viscous fluid Q sent as described above is filled in a flexible tubular casing by a filling machine, and both ends of the casing are sealed with retaining rings to make fish sausage (A). When the obtained fish sausage (A) was photographed with an X-ray photographing apparatus, an X-ray photograph as shown in FIG. 8 (a) was obtained. In this X-ray photograph, the casing image 60, the retaining ring image 61, and the fish meat image 62A were shown, but no bubbles were observed in the fish meat image 62A.
On the other hand, the viscous fluid Q was defoamed and conveyed by a conventional twin-screw pump that did not use the dispersion member 40 to obtain fish sausage (B). When the fish sausage (B) was photographed with an X-ray apparatus, an X-ray photograph as shown in FIG. 8 (b) was obtained. The X-ray photograph of the fish sausage (B) shows a casing image 60, a ring image 61, and a fish image 62, and some bubble images 63 were observed in the fish image 62.

Further, the casing and the retaining ring were removed from the fish sausage (A) obtained by using the dispersion member 40 as described above to expose the fish meat. FIG. 9A shows the fish meat that is vertically divided and opened in the longitudinal direction. When observing the fish meat 72AA and the fish meat 72AB which were vertically divided and opened, the pink color of the fish meat was deep and no bubbles were found.
On the other hand, when the fish sausage (B) obtained without using the dispersion member 40 is vertically divided and opened, as shown in FIG. 9B, the opened fish meat 72A and the fish meat 72B have bubbles 73A and bubbles. 73B, bubbles 74A and bubbles 74B were included. The bubble 73A and the bubble 73B, and the bubble 74A and the bubble 74B were one cell before being vertically divided, respectively. The pink color of the fish meat 72A and the fish meat 72B was lighter than that of the fish sausage (A) described above, probably because the air mixing rate was high.

As described above, the fish sausage (A) having almost no bubbles has a higher apparent specific gravity and a smaller variation in the specific gravity detection value than the conventional fish sausage (B) containing bubbles. , It was also possible to prevent oxidative deterioration of sausage ingredients. Therefore, it was able to greatly contribute to the stabilization of product quality.

As described above, according to the twin-screw pump 1 of the first embodiment, since the dispersion member 40 is provided on the inlet side of the viscous fluid intake 18, the viscous fluid immediately before being taken into the pump casing 2. The Q can be dispersed by the dispersion member 40 to limit the flow rate. As a result, the fluidization of the viscous fluid Q can be promoted, the collision of the bubbles in the viscous fluid Q can be promoted, and the diameter of the bubbles can be increased. Therefore, in the viscous fluid Q taken into the pump casing 2, the large-diameter bubbles easily move toward the gas outlet 20, so that the viscous fluid Q, which originally had difficulty in moving, is used. Even if there is, the bubbles can be reliably and highly extracted from the viscous fluid Q, and the degassing performance can be improved. At the same time, the surface area of the inflowing viscous fluid N, N, N, ... Inflowing from the dispersion member 40 is increased by the function of the surface area increasing means 77 by the dispersion member 40, so that the degassing performance is further improved. It will be improved.

By the way, although the dispersion member 40 is also shown in FIG. 10A, each passage hole 41 is opened with a relatively wide hole width Y (for example, 5 mm). However, a dispersion member having a passage hole having a hole width according to the viscosity and quality of the viscous fluid Q can be used. For example, in the dispersion member 40A of FIG. 10B, the hole width YA of each passage hole 41A is set to 4 mm. Further, in the dispersion member 40B of the figure (c), the hole width YB of each passage hole 41B is 3 mm, and in the dispersion member 40C of the figure (d), the hole width YC of each passage hole 41C is 2 mm. Needless to say, even these dispersion members 40A to 40C exhibit the same effect as the dispersion member 40.

The dispersion members 40 to 40C on the upper surface exemplify those formed by arranging a plurality of passage holes 41 to 41C in a straight line in a plan view in parallel, but the present invention is not limited thereto. For example, the dispersion members 40a to 40d shown in FIGS. 11A to 11D are also included in the present invention. In these, the dispersion member 40a is formed by arranging linear passage holes 41a in a radial pattern, and the dispersion member 40b is formed by a large number of circular passage holes 41b. Further, in the dispersion member 40c, a large number of circular passage holes 41c having a diameter larger than that of the passage holes 41b are formed, and in the dispersion member 40d, a plurality of large diameter passage holes 41d are arranged in a cross shape. It is formed. Even with such a dispersion member, the viscous fluid Q can be fluidized and the collision between bubbles can be promoted, so that the degassing can be improved.

"Implementation 2."
In the first embodiment, the dispersion members 40 to 40C, 40a to include the plate-shaped main body 42 and a plurality of passage holes 41 to 41C, 41a to 41d formed in the plate-shaped main body 42, respectively. Although 40d has been illustrated, the present invention is not limited thereto. For example, a twin-screw pump having a dispersion member 40e as shown in FIG. 12 is also included in the present invention.
The dispersion member 40e includes a disk-shaped plate-shaped body 45 that covers the viscous fluid intake 18 of the pump casing 2, a valve seat hole 38 formed by penetrating the plate-shaped body 45 from the front and back, and a valve seat hole 38. To fix the valve body 46 arranged with a passage gap YD (see FIG. 14) through which the viscous fluid can pass between the inner peripheral surface 37 and the valve body 46 at a predetermined position on the plate-shaped body 45. It is composed of a fixing member 47 and a nut 59. Further, the dispersion member 40e also includes a gap variable mechanism 39. The clearance variable mechanism 39 includes a base portion 55 of the fixing member 47, a female screw portion 57 of the base portion 55, and a male screw portion 48 that is erected above the valve body 46 and is screwed with the female screw portion 57. And is composed of.

As shown in FIG. 13 (c), the plate-shaped body 45 is a disk-shaped body that covers the viscous fluid intake port 18, and has a step portion 44a formed by invading downward from the upper surface of the plate. , Between the valve seat hole 38 having a circular shape in a plan view formed vertically through the central portion of the step portion 44a, and the outer and inner peripheral edges of the step portion 44a (the upper edge of the inner peripheral surface 37 of the valve seat hole 38). It is configured to include an annular mounting groove 58 engraved over the entire circumference and bolt insertion holes 43, 43, 43, 43 formed in the peripheral portion of the plate.
As shown in FIG. 13A, the valve body 46 includes a tapered portion 49 having a conical head that is reduced in diameter upward, and a male screw portion 48 that is erected on the upper surface of the tapered portion 49. Has been done. Reference numeral 49A in the figure is the lower surface of the tapered portion 49. The valve body 46 is manufactured as an integral body by, for example, being machined from a stainless steel rod.
As shown in FIG. 13B, the fixing member 47 includes a flat plate-shaped base portion 55, a pair of leg portions 56, 56 suspended from both ends of the base portion 55, and a base portion 55. It is composed of a female screw portion 57 which is formed at the center of a plane and is screwed with a male screw portion 48 of the valve body 46. The lower ends of the legs 56, 56 are formed with the same curvature as the mounting groove 58 of the plate-shaped body 45, and can be installed at a free position in the mounting groove 58.

In the biaxial screw pump using the dispersion member 40e having the above configuration, as shown in FIG. 14, the viscous fluid Q from the pipe portion 21 passes through the side of the base portion 55 of the fixing member 47, and the tapered portion of the valve body 46. Disperse by descending while spreading along 49. After that, the viscous fluid Q passes through, for example, the passing gap 41e having a gap width YD, reaches the viscous fluid intake 18, and flows into the pump casing 2. By arranging the dispersion member 40e in this way, a passage gap YD for passing the viscous fluid Q is formed between the inner peripheral surface 37 of the valve seat hole 38 and the tapered portion 49 of the valve body 46. Can be done. Then, by passing the viscous fluid Q through the passing gap YD, the viscous fluid Q can be flow-limited and diverted like the inflowing viscous fluid N1 to realize a high degree of degassing.

Further, in the clearance variable mechanism 39, the male screw portion 48 of the valve body 46 is screwed up and down with respect to the female screw portion 57 of the fixing member 47, whereby the valve body 46 is screwed to the inner peripheral surface 37 of the valve seat hole 38. The gap width YD (size) of the passage gap 41e can be adjusted by closely separating the tapered portion 49 (outer peripheral surface) of the above. Therefore, the gap width YD of the passage gap 41e can be set and changed to an appropriate size suitable for the viscosity of the viscous fluid Q. For example, for a viscous fluid Q having a higher viscosity, the male screw portion 48 is screwed downward with respect to the female screw portion 57 (in the direction of arrow N in FIG. 14) to make the passage gap 41e, for example, the gap width. It can be expanded like YD1. Further, the passage gap 41e can be completely closed by bringing the tapered portion 49 of the valve body 46 into close contact with the inner peripheral surface 37 of the valve seat hole 38. Further, even with this dispersion member 40e, the surface area of the inflow viscous fluid N1 is increased as compared with that before the inflow, so that the defoaming performance can be further improved.

"Embodiment 3."
In the above-described first and second embodiments, a biaxial screw pump having a plurality of passage holes 41, 41, 41, ... And a dispersion member having a variable gap width has been exemplified, but the present invention is limited thereto. Not a thing. For example, a biaxial screw pump using a fluid drawing member having one passage hole is also included in the present invention. As shown in FIGS. 15 to 19, such a biaxial screw pump includes a fluid drawing member 78 instead of the dispersion member shown in the first and second embodiments. The fluid drawing member 78 is another example of the surface area increasing means 77, and is a ring-shaped plate-shaped main body 42 that covers the viscous fluid intake 18 of the pump casing 2 and the plate-shaped main body 42 from the upper surface of the plate over the entire inner peripheral edge. The stepped portion 44 formed by being recessed downward, the bottomed cylindrical tubular body portion 79 suspended over the entire circumference of the inner peripheral edge of the stepped portion 44, and the bottom surface portion 80 of the tubular body portion 79 penetrate vertically. It is composed of a passage hole 82 formed in the above manner and bolt insertion holes 43, 43, 43, 43 formed on the peripheral edge of the plate-shaped main body 42 through which the bolt 51 is passed. The thickness t of the plate-shaped main body 42 is, for example, 10 mm. The tubular body portion 79 of the fluid drawing member 78 is inserted into the introduction path 86 of the flange receiving portion 50, and the plate-shaped main body 42 is fitted with the flange portion of the pipe portion 21 by the bolt 51 passed through the bolt insertion hole 43. It is fixed at 50. The upper surface opening of the tubular body portion 79 is an introduction hole 83 for taking in the viscous fluid Q from the pipe portion 21.

In this case, the opening area B1 (flow path breakage) of the single passage hole 82 is larger than the flow path cross-sectional area A [(diameter L / 2) ² · π] in the pipe portion 21 or the viscous fluid intake 18. Area) [hole width SH x diameter L] is smaller. The bottom surfaces 80 and 80 of the tubular body portion 79 are two concave curved surfaces corresponding to the ceiling shapes of the pump chambers 6 and 6 of the pump casing 2, and the ridge line portions 81 in which the bottom surface portions 80 and 80 are combined are front and rear. It is a straight line that extends. The passage hole 82 is formed so as to extend in the left-right direction perpendicular to the straight ridge line portion 81. The boundary portions of the left and right pump chambers 6 and 6 are a ridge line portion 84 on the ceiling side and a ridge line portion 85 on the lower side, and extend in the front-rear direction in the pump casing 2.

Using the twin-screw pump configured as described above, the viscous fluid Q "Tororo (viscosity 8000 cp)" is charged from the hopper 24 and transferred by the pump screws 7a and 7b while being degassed by the degassing device 27. Then, it was discharged from the viscous fluid discharge port 19. The discharged tororo was boiled in boiling water, and the defoaming performance was evaluated by the ups and downs in the water. If the tororo contains a lot of air bubbles, the tororo after boiling floats in hot water, and if there are few air bubbles, it sinks. In this case, the tororo tested showed a mode of sinking after boiling, and it was found that the tororo was sufficiently degassed. By the way, it was found that the tororo transferred by the twin-screw pump that does not use the fluid drawing member 78 floats after boiling, and the degassing is insufficient.

Subsequently, using a biaxial screw pump using the fluid drawing member 78, the viscous fluid Q "pasta sauce (viscosity 100,000 cp)" is charged from the hopper 24 in the same manner as in the case of tororo, and the degassing device 27 While degassing, the fluid was transferred by the pump screws 7a and 7b and discharged from the viscous fluid discharge port 19. The defoaming performance was evaluated by measuring the apparent specific gravity of the discharged pasta sauce. In this case, the measured pasta sauce had many samples having a heavier apparent specific gravity than the preset evaluation specific gravity, and the defective rate was relatively small at 0.125%. In addition, no invasion of the pasta sauce into the communication passage 29 leading to the degassing device 27 was observed. On the other hand, the pasta sauce sample transferred by the twin-screw pump that does not use the fluid drawing member 78 has an apparent specific gravity lighter than the evaluation specific gravity, a defect rate of 0.25%, and the pasta sauce. A part of it invaded the communication passage 29 to the degassing device 27 and foresaw a future failure of the degassing device 27.

On the other hand, as the fluid drawing member 78, one having a hole width SH of 5 mm and one having a hole width SH of 2 mm are prepared, and the viscous fluid Q is applied to a biaxial screw pump using each of them, and the above-mentioned boil test or the above-mentioned boil test or The defoaming performance was evaluated by an apparent specific gravity test. As a result, it was found that the use of the fluid drawing member 78 having a hole width SH = 2 mm is superior to the case where the fluid drawing member 78 having a hole width SH = 5 mm is used. However, when the fluid drawing member 78 having a hole width SH = 2 mm is used, the amount of fluid passing through the passing hole 82 has to be reduced, so that the viscous fluid Q can be used for applications where there is no problem even when transferring at a low flow rate. Only adaptable.

As described above, since the twin-screw pump 1 of the third embodiment uses the fluid drawing member 78, the viscous fluid Q flowing into the viscous fluid intake 18 is a hole for passing through the fluid drawing member 78. The viscous fluid intake 18 is narrowed down to an opening area smaller than the flow path cross-sectional area A by 82 and sent. Therefore, as shown in FIG. 16, the surface area (outer peripheral area [2 · (L + SH) · J2]) of the inflow viscous fluid N2 (unit volume equivalent to the inflow length J2) that has passed through the passage hole 82 per unit time is determined. It is larger than the surface area (outer peripheral area [L · π · J]) of the inflow viscous fluid N (unit volume corresponding to the inflow length J) flowing through the viscous fluid inlet 18 in a unit time. As a result, a large amount of degassing can be performed from the inflow viscous fluid N2.

Further, since the fluid drawing member 78 is provided with a plate-shaped main body 42, a tubular body portion 79, and a passage hole 82 for the bottom surface portion 80 of the tubular body portion, the hole for passing a viscous fluid is provided in a simple and inexpensive configuration. The surface area of the inflow viscous fluid N2 squeezed and taken in at 82 can be increased, and a high degree of degassing can be performed. The passage holes 82 of the tubular body portion 79 are arranged so that the slit longitudinal direction (arrow V direction (see FIG. 17B)) is directed to the left and right directions perpendicular to the axial centers Xa and Xb in the pump casing 2. Therefore, the distance to the gas outlet 20 is substantially the same from any position of the slit of the passage hole 82. Therefore, the inflow viscous fluid N2 can be efficiently degassed regardless of the passage position in the passage hole 82.

"Implementation 4."
Further, in the above, a biaxial screw pump using a fluid drawing member 78 having a slit-shaped passing hole 82 having a narrow hole width SH as an example of the surface area increasing means 77 has been shown, but the present invention is not limited thereto. For example, a biaxial screw pump using the fluid drawing member 78a as shown in FIG. 20 is also included in the present invention. The fluid drawing member 78a of the fourth embodiment also has the same components as the fluid drawing member 78 of the third embodiment, and like the fluid drawing member 78, the plate-shaped main body 42 covering the viscous fluid intake 18 is a pump casing. Attached to 2. The fluid throttle member 78a is flat because the bottom surfaces 80a and 80a on the front side (discharge port side) of the tubular body portion 79 are left and the rear side (air outlet side) of the bottom surface portion is cut out. A passage hole 82a having a semicircular shape and a wide hole width SH1 is formed.
Even with a twin-screw pump using this fluid drawing member 78a, the inflow viscous fluid N having an inflow length J per unit time that has flowed into the introduction hole 83a of the fluid drawing member 78a from the viscous fluid intake 18 is provided by the passing hole 82a. , It is narrowed down to an opening area smaller than the flow path cross-sectional area A of the introduction hole 83a and sent. That is, the surface area (outer peripheral area) of the inflow viscous fluid N3 (fluid amount of inflow length J3) that has passed through the passage hole 82a is the inflow viscous fluid N (fluid amount of inflow length J) that flows through the introduction hole 83a in a unit time. ) Is larger than the surface area (outer peripheral area). As a result, a large amount of degassed from the inflow viscous fluid N3.

The present invention described above is not limited to the above-described first and second embodiments, and includes various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention. It goes without saying that even if there is a design change within a range that does not deviate from the gist of the invention, it is included in the present invention.

1 2-axis screw pump 2 Pump casing 2A Inner peripheral surface 7a, 7b Pump screw 7Sa, 7Sb Side surface 7B Tip surface 8a, 8b Shaft 18 Viscous fluid inlet 19 Viscous fluid discharge port 20 Gas outlet 27 Degassing device 29 Continuous passage 37 Inner peripheral surface 38 Valve seat hole 39 Gap variable mechanism 40, 40a, 40b, 40c, 40d, 40e Dispersing members 40A, 40B, 40C Dispersing members 41, 41A, 41B, 41C, 41D Passing holes 41a, 41b, 41c, 41d Passing hole 41e Passing gap 42 Plate-shaped body 45 Plate-shaped body 46 Valve body 47 Fixing member 48 Male threaded part 49 Tapered part (outer peripheral surface)
50 Flange receiving part 57 Female threaded part 59 Nut 77 Surface area increasing means 78 Fluid drawing member 79 Cylindrical part 80 Bottom part 82 Passing hole G, H Gap Q Viscous fluid Xa, Xb Axis center Y, YA, YB, YC, SH , SH1 Hole width YD, YD1 Gap width J, J1, J2, J3 Inflow length L Diameter N, N1, N2, N3 Inflow viscous fluid

Claims (8)

A pair of pump screws that are screwed together in a non-contact manner and driven to rotate, a tubular pump casing that houses the pair of pump screws in a non-contact manner, and a position in the middle of the pump casing in the axial direction are provided. A viscous fluid inlet, a viscous fluid discharge port provided on the tip end side of the pump casing, a gas outlet provided on the upper surface of the pump casing on the terminal side of the viscous fluid inlet, and the gas outlet. A degassing device connected to the pump screw, which allows gas to pass through and is viscous 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. A biaxial screw pump with a gap that does not allow fluid to pass through.
A twin-screw screw pump characterized in that the viscous fluid intake of the pump casing is provided with a surface area increasing means for increasing the surface area of the viscous fluid per unit volume and allowing the viscous fluid to flow into the pump casing. The surface area increasing means is characterized by being composed of a dispersion member in which the viscous fluid is diverted and then flowed into the pump casing in order to limit the flow rate of the viscous fluid taken in from the viscous fluid intake. The twin-screw pump according to claim 1. The dispersion member includes a plate-shaped main body that covers the viscous fluid intake, and a plurality of passage holes formed through the plate-shaped main body so that the viscous fluid can pass through the front and back surfaces.
The twin-screw pump according to claim 2, wherein the viscous fluid is configured to flow into the pump casing after passing through the plurality of passage holes. The dispersion member allows a viscous fluid to pass between a plate-shaped body that covers the viscous fluid intake, a valve seat hole formed by penetrating the plate-shaped body from the front and back, and an inner peripheral surface of the valve seat hole. A valve body arranged with a possible passage gap and a fixing member for fixing the valve body to the plate-like body are provided, and after the viscous fluid has passed through the passage gap. The twin-screw pump according to claim 2, wherein the pump is configured to flow into the pump casing. The fourth aspect of claim 4 is characterized in that the outer peripheral surface of the valve body is brought close to and separated from the inner peripheral surface of the valve seat hole to change the size of the passage gap. 2-axis screw pump. A fluid drawing member in which the surface area increasing means narrows the viscous fluid taken in from the viscous fluid intake to a flow path cross-sectional area smaller than the flow path cross-sectional area of the viscous fluid intake, and then flows the viscous fluid into the pump casing. The twin-screw pump according to claim 1, wherein the two-screw pump is composed of. The fluid drawing member includes a ring-shaped plate-shaped body that covers the viscous fluid intake, a bottomed tubular body portion that is vertically provided on the inner peripheral edge of the plate-shaped body, and a bottom surface of the tubular body portion. The portion is provided with a passage hole having an opening area smaller than the flow path cross-sectional area of the tubular portion, which is formed so as to penetrate vertically, and the viscous fluid in the tubular portion passes through the passage hole. The twin-screw pump according to claim 6, wherein the pump is configured to flow into the pump casing afterwards. The passage hole of the tubular body portion is formed in a slit shape, and the passage hole is aligned with the axial center of the pump casing in the longitudinal direction of the slit in a state where the fluid drawing member is deployed at the viscous fluid intake. The twin-screw pump according to claim 7, wherein the two-screw pump is configured to be arranged in a right-angled direction.

Images