JP4242085B2 - Rotary pump and cleaning method of rotary pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary pump that feeds fluid food (for example, beverages, liquid seasonings, food materials for processing, and the like) and a cleaning method for the rotary pump.
[0002]
[Prior art]
As a rotary pump for delivering fluid foods (for example, fresh cream, hot melted chocolate, liquid seasonings such as soy sauce, processing food ingredients, etc., hereinafter collectively referred to as “liquid foods”), FIG. 5 and FIG. As shown, a pump that is fed from the suction port 3 to the discharge port 4 by the rotation of the pair of rotors 2a and 2b disposed in the rotor chamber 1 is often used.
The rotors 2 a and 2 b are attached to two rotary shafts 7 and 8 disposed in parallel in the casing 6 of the rotary pump 5, and are rotated by the rotation of the rotary shafts 7 and 8. Each rotor 2 a, 2 b has a plurality of feed blades 2 c that project radially from the rotation center (here, a pair on opposite sides of the rotation center), and one rotor at the center of the rotor chamber 1. The feed blades 2c of the other rotor enter the gap between the feed blades 2c, and the feed blades 2c are arranged so as to mesh with each other.
The rotors 2a and 2b are rotationally driven so as to be opposite to each other, and the feed blades 2c of the rotors 2a and 2b are moved in sliding contact with the inner surface of the rotor chamber 1 by this rotational driving, thereby The liquid food E is sucked from the suction port 3, and the feed blades 2c of the rotors 2a and 2b approach each other in the vicinity of the discharge port 4, and finally mesh with each other at the center portion of the rotor chamber 1, whereby the feed blades The liquid food E sent to the vicinity of the discharge port 4 by 2c is extruded from the discharge port 4.
[0003]
As shown in FIG. 7, the projecting proximal end portion of the rotating shaft 7 into the rotor chamber 1 is accommodated in a shaft hole 9 a formed in the inner wall portion 9 of the rotary pump 5. In the innermost part of the shaft hole 9a (the innermost side from the rotor chamber 1; the central part in FIG. 5), the rotor chamber 1 with respect to the shaft-side seal portion 10 fixed in the periphery of the rotary shaft 7 and provided in a flange shape. The movable seal member 11 is pressed from the side (first seal mechanism), and the ring-shaped fixed seal member 12 fixed to the inner wall 9 side is in sliding contact with the outer surface of the shaft-side seal portion 10 (second seal mechanism). ), The leakage of the liquid food E that has entered the shaft hole 9a from the rotor chamber 1 side is double-sealed.
The movable seal member 11 is formed in a ring shape that is in contact with the surface facing the rotor chamber 1 side of the shaft-side seal portion 10 (hereinafter referred to as “seal surface 10a”) without any gap. And is pressed against the seal surface 10a by a spring 13 provided therebetween. On the other hand, the fixed seal member 12 is sealed watertight with an oil seal between the fixed seal member 12 and the seal surface 10 b formed on the outer peripheral surface of the shaft-side seal portion 10.
The first and second sealing mechanisms described above are the same for the rotating shaft 8.
[0004]
Between the movable seal member 11 and the fixed seal member 12, a removal liquid flow path 14 provided around the seal surface 10a of the shaft-side seal portion 10 is secured. Even if the liquid food E leaks from between the movable seal member 11 and the movable seal member 11, the leaked liquid food E is removed by the flow of a cleaning liquid such as sterile water passed through the removal liquid channel 14. Can prevent bacterial growth and the like. The cleaning liquid is passed through the removal liquid flow path 14 by injecting and discharging the cleaning liquid from the liquid flow path 15 that passes through the inner wall portion 9 and communicates with the removal liquid flow path 14. .
[0005]
In this rotary pump 5, the liquid food E can be sent from the suction port 3 to the discharge port 4 by rotating the pair of rotors 2a and 2b in the opposite directions as described above (see FIG. 8A). . In addition, it is common to clean the rotor chamber 1 by the operation of sending the cleaning liquid from the suction port 3 to the discharge port 4. At the time of cleaning, as shown in FIG. 8B, the opening / closing provided in the bypass pipe 18 connecting the front pipe 16 connected to the suction port 3 and the rear pipe 17 connected to the discharge port 4 With the valves 19a and 19b opened, the cleaning liquid is fed by the rotary pump 5 in a state where the flow rate of the cleaning liquid from the liquid inlet to the liquid outlet of the piping system to which the rotary pump 5 is connected is increased. Further, after the cleaning is completed, the on-off valve 21 of the drain pipe 20 connected to the bypass pipe 18 is opened, and the cleaning liquid remaining in the bypass pipe 18 and the like is discharged.
[0006]
[Problems to be solved by the invention]
However, the rotary pump 5 as described above has a problem that it is difficult to clean the shaft hole 9a.
That is, during the feeding operation of the liquid food, the back pressure generated between the suction port 3 and the discharge port 4 (back pressure of 1.5 kg / cm ^{2 in} the example of FIG. 8A. However, the bypass pipe 18 is closed. ) Causes the liquid food E to enter from the rotor chamber 1 into the shaft hole 9a. However, as described above, in the cleaning method in which the rotary pump 5 is operated in a state where the flow rate of the cleaning liquid is increased using the bypass pipe 18, almost no differential pressure is generated between the suction port 3 and the discharge port 4. Since there is no (refer FIG.8 (b)), it is hard for a washing | cleaning liquid to enter into the said shaft hole 9a, and the washability in the shaft hole 9a cannot be improved. For this reason, it was necessary to carry out the cleaning process for a long time or to perform periodic disassembly and cleaning, and there was a complaint that the time and labor required for cleaning were enormous.
[0007]
The present invention has been made in view of the above-described problems, and provides a rotary pump and a cleaning method for the rotary pump that can improve the cleaning performance of a rotor chamber and a region where liquid food can continuously enter the rotor chamber. With the goal.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a rotary pump for feeding a liquid food having fluidity from the suction port to the discharge port by rotation of the rotor in the rotor chamber, and a base end portion of the rotor rotating shaft protruding into the rotor chamber A shaft-side seal part provided in the form of a flange around the shaft, and a ring-like shape along the shaft-side seal part, and can be sealed watertight by being pressed against the shaft-side seal part from the rotor chamber side A seal portion formed of a movable seal member separates the liquid passage for removal provided around the seal surface with which the movable seal member abuts at the shaft-side seal portion and the rotor chamber. A back pressure valve capable of generating a back pressure that leaks the liquid in the rotor chamber to the removal liquid flow path through the seal portion. Characterized in that it is connected to.
According to a second aspect of the present invention, in the rotary pump according to the first aspect, the sealing member is provided around the rotary shaft with a gap of 1.0 mm or more between the seal member and the rotary shaft. It is characterized by.
The invention according to claim 3 is provided in a ring shape along the shaft side seal portion provided in a flange shape around the base end portion of the rotating shaft of the rotor protruding into the rotor chamber, A movable seal member that can be sealed watertight by being pressed against the shaft-side seal portion from the rotor chamber inside is provided around a seal surface on which the movable seal member abuts at the shaft-side seal portion. The liquid passage for removal and the rotor chamber have a seal portion that partitions the fluid chamber, and the liquid food having fluidity is sent from the suction port to the discharge port by the rotation of the rotor in the rotor chamber. About the rotary pump, a cleaning method of the rotary pump for cleaning the rotor chamber by sending out the cleaning liquid from the suction port to the discharge port Oite, wherein the back pressure is exerted between the inlet and the discharge port, characterized by the washing liquid of said rotor chamber be leaked to the sealing portion and the removal liquid flow path through the.
According to a fourth aspect of the present invention, in the rotary pump cleaning method according to the third aspect, the rotary pump according to the first or second aspect is adopted as the rotary pump.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 4A and 4B, the same components as those in FIGS. 5 to 8A and 8B are denoted by the same reference numerals.
FIG. 1 is a front sectional view showing a rotary pump 50 according to an embodiment of the present invention, and FIG. 2 is the innermost part of the shaft hole 9a of the rotary pump 50 (the innermost part seen from the rotor chamber 1 side. 3) is an enlarged view showing the vicinity, FIGS. 3A to 3D are side sectional views showing the feeding operation of the liquid food E by the rotary pump 50, and FIG. 4 is a view showing a piping system to which the rotary pump 50 is connected. (A) shows when the liquid food E is delivered, and (b) shows when it is washed.
[0010]
As shown in FIGS. 1 to 3 (a) to 3 (d), the rotary pump 50 discharges the liquid food E from the suction port 3 by the rotation of the pair of rotors 2 a and 2 b disposed in the rotor chamber 1. It sends out to the exit 4. Here, the liquid food E is a generic term for fluid foods and food materials such as fresh cream, hot melted chocolate, liquid seasonings such as soy sauce, various liquid food materials, beverages and the like.
[0011]
The rotors 2a and 2b are attached to two rotating shafts 7 and 8 arranged in parallel in the casing 6 of the rotary pump 5 (one rotor is fixed to one rotor), and each rotating shaft 7 and 8 are rotated. The rotating shafts 7 and 8 mesh with the helical gears 7a and 8a provided on the rotating shafts 7 and 8, respectively. When one rotating shaft 7 is rotationally driven by a driving force such as a motor, the rotating shafts 7 and 8 are Synchronously, it is rotated in the opposite direction.
Each of the rotors 2a and 2b has a feed blade 2c that protrudes from the rotation center in a plurality of radial directions (here, a pair on opposite sides of the rotation center). The rotation trajectory of the feed blade 2c of each rotor 2a, 2b is located on the same plane orthogonal to both the rotation shafts 7, 8, and the distance between the rotation centers of each rotor 2a, 2b is the rotor 2a, 2b. In the central portion of the rotor chamber 1, the feed blade 2c of the other rotor is inserted into the gap 2d between the adjacent feed blades 2c of the one rotor. The feed blades 2c are engaged with each other.
[0012]
The rotor chamber 1 has a configuration in which two rotor chambers 1a and 1b are continuous. Each rotor chamber 1a and 1b accommodates two rotors 2a and 2b one by one. The suction port 3 and the discharge port 4 are opposed to positions on the left and right sides through the communicating portions 1c of the rotor chambers 1a and 1b when the rotary pump 50 is viewed from the side (see FIGS. 3A to 3D). Has been placed.
[0013]
As shown in FIG. 4A, the rotary pump 50 is disposed between the front pipe 16 connected to the suction port 3 and the rear pipe 17 connected to the discharge port 4. The liquid food E fed from the inlet of the delivery piping system 52 including the rotary pump 50 and the rear piping 17 (the end on the front piping 16 side when viewed from the rotary pump 50) is supplied to the delivery piping system 52. It is sent out to the outlet (the end on the rear pipe 17 side when viewed from the rotary pump 50). When the rotors 2a and 2b are rotationally driven, the liquid food E delivery operation from the suction port 3 to the discharge port 4 is repeated in the cycles of FIGS. 3 (a) to 3 (d). The rotors 2a and 2b are rotated in opposite directions. In FIGS. 3A to 3D, one rotor 2a rotates clockwise and the other rotor 2b rotates counterclockwise. To do.
[0014]
As shown in FIG. 3A, in the vicinity of the suction port 3, the feed blades 2c of the rotors 2a and 2b move in directions away from the suction port 3 by the rotation of the rotors 2a and 2b, respectively. Liquid food E is sucked into the rotor chamber 1 from the suction port 3. As shown in FIG. 4A, the liquid food E sucked from the front pipe 16 connected to the suction port 3 is sucked into the rotor chamber 1.
[0015]
Next, as shown in FIG. 3 (b), the liquid food E sucked into the rotor chamber 1 is pushed out by the feed blade 2c that has moved from the communicating portion 1c to the vicinity of the suction port 3 so as to be ejected. Moved to. In the vicinity of the suction port 3 from the communication portion 1c, the feed blades 2c of the two rotors 2a and 2b alternately move. The feed blade 2c that has passed through the vicinity of the suction port 3 moves while sliding in contact with the inner surface of the rotor chamber 1, whereby the liquid food E can be sent to the discharge port 4 with almost no leakage.
[0016]
As shown in FIG. 3C, in the vicinity of the discharge port 4, the liquid food E is pushed out by the feed blade 2 c that has moved from the vicinity of the suction port 3. Specifically, the liquid food E is transferred from the suction port 3 to the discharge port 4 while being held in a gap 2d between a pair of adjacent feed blades 2c of the same rotor 2a (or 2b). In the vicinity of the discharge port 4, the liquid food E is gradually pushed out from the gap 2d as the feed blade 2c of the other rotor gradually bites into the gap 2d between the adjacent feed blades 2c of one rotor. As a result, the liquid food E is discharged from the discharge port 4.
[0017]
FIG. 3 (c) shows a state in which the liquid food E held in the gap 2d between the feed blades 2c of one rotor 2a is moved to the vicinity of the discharge port 4, but as shown in FIG. 3 (d), Similarly, the liquid food E which is held in the gap 2d between the feed blades 2c of the rotor 2b and moved to the vicinity of the discharge port 4 is gradually bitten by the feed blades 2c of the other rotor 2a in the gap 2d. It is discharged from the discharge port 4.
And in this rotary pump 50, the liquid food E can be sent out continuously by repeating the cycle of Fig.3 (a)-(d).
[0018]
As shown in FIGS. 1 and 2, the base end of the rotary shaft 7 protruding into the rotor chamber 1 is accommodated in a shaft hole 9 a formed in the inner wall 9 of the rotary pump 5. In the innermost part of the shaft hole 9a (the innermost part from the rotor chamber 1; the central part in FIG. 1), the rotor chamber 1 with respect to the shaft-side seal portion 10 fixed around the rotating shaft 7 and provided in a flange shape. The movable seal member 51 is pressed from the side (first seal portion, corresponding to the seal portion according to claims 1 and 3), and the shaft side of the ring-shaped fixed seal member 12 fixed to the inner wall portion 9 side. Due to the sliding contact with the outer surface of the seal portion 10 (second seal portion), the liquid food E that has entered the shaft hole 9a from the rotor chamber 1 side leaks to the gear box 55 side that houses the helical gears 7a, 8a and the like. That double seal.
[0019]
The movable seal member 51 is formed in a ring shape that is in contact with the entire surface of the shaft-side seal portion 10 facing the rotor chamber 1 (hereinafter referred to as “seal surface 10a”) without gaps, and the inner wall portion. 9 and is pressed against the seal surface 10a by being urged by a spring 13 provided therebetween. On the other hand, the fixed seal member 12 is watertightly sealed with an oil seal between the fixed seal member 12 and the seal surface 10 b formed on the outer peripheral surface of the shaft-side seal portion 10.
The first and second seal portions described above are the same for the rotating shaft 8.
[0020]
Between the movable seal member 51 and the fixed seal member 12, a removal liquid flow path 14 provided around the seal surface 10 a of the shaft-side seal portion 10 is secured, and is movable with the shaft-side seal portion 10. The liquid food E leaked from between the sealing member 51 and the seal member 51 is removed by a flow of cleaning liquid such as sterile water that has been passed through the removal liquid flow path 14. The cleaning liquid is passed through the removal liquid flow path 14 by injecting and discharging the cleaning liquid from the liquid flow path 15 that passes through the inner wall portion 9 and communicates with the removal liquid flow path 14.
[0021]
(Sending operation)
In order to send out the liquid food E from the inlet to the outlet of the delivery pipe system 52, the rotary pump 50 may be driven with the bypass pipe 18 closed as shown in FIG. However, it is preferable that a slight back pressure is applied between the suction port 3 side and the discharge port 4 side of the rotary pump 50 by the back pressure valve 53 in view of the stability of the discharge amount.
[0022]
(Cleaning method)
As shown in FIG. 4B, cleaning of the rotor chamber 1 of the rotary pump 5 is performed by sending out cleaning liquid from the suction port 3 to the discharge port 4. The back pressure valve 53 provided at the side secures a back pressure against the suction port 3 on the discharge port 4 side, and the back pressure causes the cleaning liquid to leak from between the shaft-side seal portion 10 and the movable seal member 51. As a result, the cleaning liquid can be easily distributed in the shaft hole 9a and can be cleaned efficiently.
During cleaning, the on-off valves 19a and 19b provided in the bypass pipe 18 connecting the front pipe 16 connected to the suction port 3 and the rear pipe 17 connected to the discharge port 4 are opened. In the state where the flow rate of the cleaning liquid from the liquid inlet to the liquid outlet of the piping system to which the rotary pump 5 is connected is increased, the cleaning liquid is fed by the rotary pump 5. Further, after the cleaning is completed, the on-off valve 21 of the drain pipe 20 connected to the bypass pipe 18 is opened, and the cleaning liquid remaining in the bypass pipe 18 is discharged. The back pressure valve 53 is provided in the rear pipe 17 between the connection portion between the rear pipe 17 and the bypass pipe 18 and the rotary pump 50.
[0023]
The back pressure secured by the back pressure valve 53 can be changed by operating the back pressure valve 53. When the liquid food E is delivered, the back pressure is supplied from between the shaft-side seal portion 10 and the movable seal member 51. The range is such that the liquid food E does not leak, and the back pressure is such that the cleaning liquid leaks from between the shaft-side seal portion 10 and the movable seal member 51 during cleaning. Accordingly, the liquid food E can be reliably prevented from leaking from between the shaft-side seal portion 10 and the movable seal member 51 when the liquid food E is sent from the inlet to the outlet of the delivery piping system 52, and the shaft hole 9a is washed. The cleaning liquid can be distributed well throughout, improving the cleaning performance, reducing the cleaning time, and omitting disassembly and cleaning of the rotary pump 50.
[0024]
As shown in FIG. 2, in the rotary pump 50, the gap dimension S between the movable seal member 51 and the shafts 7 and 8 is secured wider than that of the movable seal member 11 of the rotary pump 5 shown in FIG. Moreover, the length dimension L along the axial direction of the shafts 7 and 8 is shortened compared to the movable seal member 11 of the rotary pump 5 shown in FIG. For this reason, in this rotary pump 50, it is easy for the cleaning liquid to flow into the gap between the movable seal member 51 and the shafts 7 and 8, and the cleaning performance can be improved.
In addition, watertightness is ensured by the O-ring 54 between the movable seal member 51 and the inner surface of the shaft hole 9a.
[0025]
(Concrete example)
The gap dimension between the movable seal member 51 and the shafts 7 and 8 was S = 1.5 mm, and the length dimension of the movable seal member 51 was L = 20 mm.
In the rotary pump 5 of the conventional example, the gap dimension between the movable seal member 11 and the shafts 7 and 8 is about S1 = 0.69 mm, and the length dimension in the axial direction of the shaft 7 is about L1 = 27 mm. is there. Accordingly, the gap dimension S between the movable seal member 51 and the shafts 7 and 8 is about twice that of the conventional example.
Delivery process: As shown in FIG. 4A, the delivery of the liquid food E from the inlet to the outlet of the delivery piping system 52 is adjusted by adjusting the back pressure valve 53, and the inlet 3 side pressure P1 = 0.5 kg / cm. ² mm, as a discharge port 4 side pressure P2 = 2.0 kg / cm ^{2 or} so, the pressure difference between P2-P1 = 1.5kg / cm ² about the back pressure (inlet 3 side and the discharge port 4 side ). The bypass pipe 18 is closed.
Cleaning process: As shown in FIG. 4B, the cleaning liquid is introduced from the inlet of the delivery piping system 52, and the discharge pressure 4 side pressure P2 = about 3.0 kg / cm ² is secured by adjusting the back pressure valve 53. The rotary pump 50 is driven to send the cleaning liquid to the outlet of the delivery piping system 52, and the cleaning fluid from the inlet to the outlet of the delivery piping system 52 is also driven via the bypass piping 18 by driving the on-off valves 19a and 19b of the bypass piping 18. The entire delivery piping system 52 and the inside of the rotary pump 50 are cleaned. In the flow path of the cleaning liquid formed by the front pipe 16, the bypass pipe 18, and the rear pipe 17 of the delivery pipe system 52, a pressure of about 1.0 kg / cm ² is secured. In the rotary pump 50, the suction port 3 side pressure P1 = about 1.0 kg / cm ² and the discharge port 4 side pressure P2 = about 3.0 kg / cm ² are secured, and P2−P1 = about 2.0 kg / cm ² . Back pressure (differential pressure between the suction port 3 side and the discharge port 4 side) is secured.
As a result of repeatedly feeding the liquid food E and cleaning the delivery piping system 52 and the rotary pump 50 under the above-described conditions, the entire rotor chamber 1 including the shaft hole 9a can be reliably cleaned in the cleaning process. It could be confirmed.
Further, as a result of studies by the present inventors, if the gap size S between the movable seal member 51 and the shaft 7 is approximately 1.0 mm or more, depending on the degree of back pressure, the inflow of cleaning liquid is very high. It turned out to be easy.
[0026]
Needless to say, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the specific shape and the like of the movable seal member can be changed as appropriate.
The suction port 3 side pressure and the discharge port 4 side pressure during the feeding operation and washing of the liquid food E are not limited to the values described in the above embodiment and FIGS. 4A and 4B, and can be changed as appropriate. It is.
[0027]
【The invention's effect】
As described above, according to the present invention, by applying a back pressure between the discharge port and the suction port of the rotary pump, the cleaning liquid in the rotor chamber can be leaked through the seal portion. It is possible to improve the cleanability of the entire rotor chamber including the portion, particularly the cleanability near the seal portion. If the back pressure valve is connected to the discharge port of the rotary pump as in claim 1, the desired back pressure can be easily and reliably applied to the rotary pump, and the cleaning performance in the rotor chamber is improved. Can also be realized easily. In addition, as described in claim 2, when a gap of 1.0 mm or more is secured between the movable seal member of the seal portion, the flow of the cleaning liquid to the vicinity of the seal portion is facilitated, and the cleaning property is further improved. Is possible.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a rotary pump according to an embodiment of the present invention.
FIG. 2 is an enlarged view showing the vicinity of the innermost part of the shaft hole of the rotary pump of FIG.
FIGS. 3A to 3D are side cross-sectional views showing the liquid food E delivery operation by the rotary pump of FIG.
4A and 4B are diagrams showing a piping system to which the rotary pump of FIG. 1 is connected, in which FIG. 4A shows when liquid food E is delivered, and FIG.
FIG. 5 is a front sectional view showing a conventional rotary pump.
6 is a side sectional view showing the rotary pump of FIG. 5. FIG.
7 is an enlarged view showing the vicinity of the innermost part of the shaft hole of the rotary pump of FIG. 5. FIG.
8A and 8B are diagrams showing a piping system to which the rotary pump of FIG. 5 is connected, in which FIG. 8A shows when the liquid food E is delivered, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Rotor chamber, 2a, 2b ... Rotor, 10 ... Shaft side seal part, 14 ... Removal liquid flow path, 50 ... Rotary pump, 51 ... Movable seal member, 53 ... Back pressure valve, E ... Liquid food , S ... Gap.

Claims (4)

In a rotary pump that feeds liquid food having fluidity from the suction port to the discharge port by rotation of the rotor in the rotor chamber,
A shaft-side seal portion provided in a flange shape around the base end portion of the rotor rotating shaft protruding into the rotor chamber, and provided in a ring shape along the shaft-side seal portion, A seal portion comprising a movable seal member that can be sealed in a watertight manner by being pressed against the shaft-side seal portion, and is provided around the outer surface of the seal surface with which the movable seal member abuts at the shaft-side seal portion. The removal liquid flow path and the rotor chamber are partitioned,
A rotary pump characterized in that a back pressure valve capable of generating a back pressure that leaks the liquid in the rotor chamber to the removal liquid flow path through the seal portion is connected to the discharge port. The rotary pump according to claim 1, wherein the seal member is provided around the rotary shaft with a gap of 1.0 mm or more between the seal member and the rotary shaft. A shaft-side seal portion provided in a flange shape around the proximal end portion of the rotor rotating shaft protruding into the rotor chamber, and provided in a ring shape along the shaft-side seal portion, from the rotor chamber inner side to the shaft side A removal liquid flow path provided around a seal surface with which the movable seal member is brought into contact with the shaft-side seal portion by a movable seal member that can be sealed watertight by being pressed against the seal portion; A rotary pump having a seal part for partitioning with the rotor chamber and configured to send a liquid food having fluidity from the suction port to the discharge port by rotation of the rotor in the rotor chamber. In the cleaning method of the rotary pump for cleaning the interior of the rotor chamber by sending the cleaning liquid to the discharge port,
Cleaning of the rotary pump, wherein the cleaning liquid in the rotor chamber is leaked to the removal liquid flow path through the seal portion by back pressure applied between the suction port and the discharge port. Method. The rotary pump cleaning method according to claim 3, wherein the rotary pump according to claim 1 is employed as the rotary pump.

Images