Slurry ice wash device and slurry ice wash method

Abstract

To adequately wash the inside of a pipe having a bent part to be washed.SOLUTION: Slurry ice is introduced into a pipe to be washed B, and the pipe to be washed B is thus filled with the slurry ice. Tap water is introduced into the pipe to be washed B, and a small lump of the slurry ice is left on an inner peripheral part of a bent part Bb. Since the temperature of the tap water is higher than the temperature of the slurry ice, the small lump of the slurry ice is forced by a water stream to flow. Consequently, the inside of the bent part Bb is adequately ground.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a slurry ice cleaning device and a slurry ice cleaning method for cleaning the inside of a pipe to be cleaned that has a bent portion with slurry ice. [Background technology]

[0002] In food factories, pharmaceutical factories, and other facilities, the inside of a pipe to be cleaned is cleaned by injecting slurry ice into the pipe. This slurry ice is made of water containing water-soluble catalysts such as salt. This slurry ice is a sherbet-like substance containing ice particles, and deposits inside the pipe are scraped off by being polished by the slurry ice. The scraped off deposits are then absorbed into the slurry ice, and the inside of the pipe is hygienically cleaned by discharging the scraped off deposits together with the slurry ice from an opening on one end of the pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-44017 [Patent Document 2] Patent Publication No. 2021-90917 Summary of the Invention [Problem to be solved by the invention]

[0004] There are various types of pipes to be cleaned using a slurry ice cleaning device. For example, pipes used in food production lines have small diameters and bends. When slurry ice is injected into this type of pipe, the flow rate of the slurry ice at the inner periphery of the bend is slower than the flow rate of the slurry ice at the outer periphery of the bend, making it more likely for the slurry ice to adhere to or accumulate at the inner periphery of the bend. As a result, subsequent slurry ice flows to the outer periphery of the bend where no slurry ice has adhered or accumulated. This tends to reduce the amount of polishing performed by the slurry ice at the inner periphery where the slurry ice has adhered or accumulated. Therefore, if dirt adheres to the inner periphery of the bend, there is a risk that the dirt will not be removed. Similar adhesion and accumulation of slurry ice can occur in other cases where the dirt has a unique pattern.

[0005] The present invention was made against the background of the above circumstances, and its purpose is to provide a slurry ice cleaning device and a slurry ice cleaning method that can restore the cleaning power of slurry ice when the above-mentioned adhesion or retention of slurry ice occurs inside a pipe to be cleaned that has a bent section, causing the cleaning power of the slurry ice to decrease. [Means for solving the problem]

[0006] The gist of the first invention is a slurry ice washing device for washing the inside of a pipe to be washed with slurry ice, the slurry ice having an inlet for injecting slurry ice, which is a mixture of a solution in which a solute is dissolved and fine solid particles of the solution, an outlet for discharging the slurry ice, and a bent portion located between the inlet and the outlet, (b) an injection mechanism having a first injection mode for injecting the slurry ice into the pipe to be washed and a second injection mode for injecting the solution, which is hotter than the slurry ice, into the pipe to be washed, and (c) a washing device for washing the inside of the pipe to be washed by switching the injection mechanism between the first injection mode and the second injection mode. (d) the cleaning means performs a cleaning operation consisting of alternating repetition of a filling operation in which the slurry ice is injected into the cleaned pipe for a first predetermined time in the first injection mode of the injection mechanism, and a liquid injection operation which is started after the filling operation is completed and in which the solution is injected into the cleaned pipe for a second predetermined time in the second injection mode of the injection mechanism, thereby pushing the slurry ice filled in the cleaned pipe out of the cleaned pipe by the flow of the solution, and (e) the first predetermined time is the time it takes for the slurry ice to be filled from the inlet to the outlet and for the slurry ice in the cleaned pipe to be pushed out of the outlet by the subsequent slurry ice.

[0007] The gist of the second invention of the slurry ice washing device is that in the first invention, the washing means starts a rinsing operation to rinse the inside of the pipe to be washed by injecting the solution into the pipe to be washed in the second injection mode of the injection mechanism after completing the washing operation.

[0008] The gist of the slurry ice cleaning device of the third invention is that, in the first or second invention, (a) it is provided with a slurry ice tank for storing the slurry ice, and (b) the injection mechanism injects the slurry ice from the slurry ice tank into the pipe to be cleaned by the discharge pressure of a pump in the first injection mode, and injects tap water from a water pipe as the solution into the pipe to be cleaned by the water pressure of the water pipe in the second injection mode.

[0009] The gist of the fourth invention is a slurry ice cleaning method for cleaning the inside of a pipe to be cleaned with slurry ice, the pipe having an inlet for injecting slurry ice, which is a mixture of a solution in which a solute is dissolved and fine solid particles of the solution, an outlet for discharging the slurry ice, and a bent portion located between the inlet and the outlet, the method comprising: (b) using an injection mechanism having a first injection mode for injecting the slurry ice into the pipe to be cleaned and a second injection mode for injecting water at a temperature higher than that of the slurry ice into the pipe to be cleaned; and (c) using the injection mechanism in the first injection mode. A cleaning operation is performed by alternately repeating a filling operation in which the slurry ice is injected into the pipe to be cleaned for a first predetermined time, and an injection operation which is started after the completion of the filling operation and in which the solution is injected into the pipe to be cleaned for a second predetermined time in the second injection mode of the injection mechanism, thereby pushing the slurry ice filled in the pipe to be cleaned out of the pipe to be cleaned by the flow of the solution, and (d) the first predetermined time is the time during which the slurry ice is filled from the inlet to the outlet and the slurry ice in the pipe to be cleaned is pushed out from the outlet by the subsequent slurry ice.

[0010] The gist of the slurry ice cleaning method of the fifth invention is that (a) a tubular part is used for throttling the flow of a fluid, the tubular part having a starting end face and an ending end face, the starting end being an open slurry inlet and the ending end being an open slurry outlet, and (b) the slurry ice in the pipe to be cleaned is supplied from the pipe to be cleaned into the tubular part through the slurry inlet, and then discharged from the tubular part through the slurry outlet. [Effects of the Invention]

[0011] According to the first aspect of the present invention, slurry ice is injected into the pipe to be cleaned for a first predetermined time during the filling operation, thereby filling the pipe with slurry ice. When the liquid injection operation is started after the filling operation is completed, the slurry ice packed on the outer periphery of the bent section is washed away by the flow of solution preferentially compared to the slurry ice packed on the inner periphery of the bent section.

[0012] During the liquid injection operation, a solution that is hotter than the slurry ice comes into contact with the slurry ice, causing the temperature difference to cause the slurry ice to melt and reduce in volume. This generates negative pressure inside the pipe being cleaned, and the lower-viscosity, high-temperature solution is drawn toward the side where the negative pressure is occurring. When this high-temperature solution is drawn toward the side where the negative pressure is occurring, the degree of contact between the slurry ice and the high-temperature solution becomes less frequent, so the high-temperature solution flows inside the pipe being cleaned, with the high-temperature solution firmly pushing against the area of ​​the slurry ice that is behind the high-temperature solution. Therefore, regardless of the position of the small lumps of slurry ice, the high-temperature solution reaches the small lumps of slurry ice, causing them to be detached and pushed away by the flow of solution.

[0013] Furthermore, if small lumps of slurry ice adhere to the bent section of the pipe to be cleaned, even if the slurry ice continues to be injected into the pipe to be cleaned, the slurry ice will flow through the parts that are easier to flow, avoiding the small lumps. For this reason, it is difficult to remove the small lumps of slurry ice by continuing to inject slurry ice into the pipe to be cleaned when they are still attached. The first invention involves an injection operation with the aim of removing small lumps of slurry ice from the bent section of the pipe to be cleaned.

[0014] Furthermore, the cleaning operation is performed by alternating between filling and liquid injection. This liquid injection operation flushes out small lumps of slurry ice from the pipe to be cleaned, and the next filling operation begins with the cleaning ability restored by the slurry ice, with the small lumps of slurry ice removed from the pipe to be cleaned. This makes it possible to thoroughly clean the inside of the pipe to be cleaned.

[0015] According to the second aspect of the present invention, the rinsing operation in which the injection mechanism injects the solution into the pipe to be cleaned in the second injection mode is started after the cleaning operation is completed, so that the inside of the pipe to be cleaned can be rinsed with the solution. According to the third aspect of the present invention, tap water is injected into the pipe to be cleaned from the water pipe by the water pressure of the water pipe during the liquid injection operation. This eliminates the need for a tank to store the solution and a high-pressure pump to inject the solution from the tank into the pipe to be cleaned at high pressure, thereby simplifying the configuration of the slurry ice washing device.

[0016] According to the fourth aspect of the present invention, slurry ice is injected into the pipe to be cleaned for a first predetermined time, filling the pipe with slurry ice. During the subsequent liquid injection operation, the slurry ice comes into contact with a solution that is hotter than the slurry ice, and as described above, small lumps of slurry ice are detached and pushed away by the flow of the solution.

[0017] Furthermore, the cleaning operation is performed by alternating between filling and injection. This injection operation flushes out small lumps of slurry ice from the pipe to be cleaned, and the next filling operation begins with the cleaning ability restored by the slurry ice, with the small lumps removed from the pipe to be cleaned. This makes it possible to thoroughly clean the inside of the pipe to be cleaned.

[0018] According to the fifth aspect of the present invention, the slurry ice in the pipe to be cleaned flows from the pipe to be cleaned through the slurry inlet of the tubular part into the tubular part and is then discharged from the slurry outlet of the tubular part. The flow of the slurry ice is constricted within the tubular part, increasing the flow resistance of the slurry ice within the pipe to be cleaned. As a result, the slurry ice fills the pipe to be cleaned from the bottom to the ceiling, making it possible to more thoroughly clean the inside of the pipe to be cleaned, even if it has bent sections. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1(a) is a schematic diagram showing the mechanical configuration of a slurry ice washing device according to a first embodiment of the present invention, and FIG. 1(b) is an enlarged cross-sectional view of the Xb portion of FIG. 1(a). [Figure 2] 2(a) is a diagram for explaining the operation of the slurry ice washing device according to the first embodiment of the present invention, and FIG. 2(b) is a diagram for explaining the operation of the unit washing operation of FIG. 2(a). [Figure 3] FIG. 2 is a cross-sectional view showing the inside of a bent portion of a pipe to be cleaned. [Figure 4] 1(b) shows a reducer according to a second embodiment of the present invention, and FIG. 1(b) shows a reducer according to a third embodiment of the present invention, corresponding to FIG. 1(b). [Figure 5] (a) is a diagram equivalent to FIG. 1(b) showing a reducer according to Example 4 of the present invention, (b) is a diagram equivalent to FIG. 1(b) showing a reducer according to Example 5 of the present invention, and (c) is a diagram equivalent to FIG. 1(b) showing a reducer according to Example 6 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, first to sixth embodiments of the present invention will be described with reference to the drawings. [Example]

[0021] As shown in Figure 1(a), the slurry ice washing device 10 is transported between the slurry ice production device A and the pipe to be washed B, and has multiple tires 12 for transportation. The pipe to be washed B is used in a food production line. The inner diameter of this pipe to be washed B is set to be significantly smaller than the inner diameter of a sewer pipe (not shown), and the pipe to be washed B has multiple bends Bb. A circular inlet Bi is provided at the starting end face of the pipe to be washed B. This inlet Bi corresponds to the inlet of this invention.

[0022] As shown in Figure 1(a), the pipe to be cleaned B has a straight pipe section B1. This straight pipe section B1 is cylindrical and located at the end of the pipe to be cleaned B. When viewed from the axial direction, the straight pipe section B1 has a circular outer shape. As shown in Figure 1(b), a circular outlet Be is provided at the end surface of this straight pipe section B1. This outlet Be corresponds to the outlet of this invention.

[0023] As shown in Figure 1(a), slurry ice production device A is a stationary type that is installed on the floor and has a water inlet A1 through which water is poured and an inlet A2 through which salt is poured. This slurry ice production device A has a built-in generator (not shown), which produces sherbet-like slurry ice containing ice particles from saltwater with a mass concentration of 1.0% salt. This slurry ice corresponds to the slurry ice of the present invention, with the saltwater corresponding to the solution of the present invention, the salt corresponding to the solute, and the ice particles corresponding to solid microscopic bodies.

[0024] As shown in FIG. 1(a), the slurry ice washing device 10 is detachably connected to the slurry ice production device A via connecting pipes P1 and P2 during production of slurry ice. The slurry ice washing device 10 has a slurry ice tank 14. The slurry ice produced by the slurry ice production device A is supplied to the slurry ice tank 14 through connecting pipe P1 (see arrow). The slurry ice in the slurry ice tank 14 is returned to the slurry ice production device A through connecting pipe P2 (see arrow). The slurry ice is circulated between the slurry ice tank 14 and the slurry ice production device A, and the slurry ice is supercooled to -2.0°C as it circulates between the two. The slurry ice washing device 10 corresponds to the slurry ice washing device of the present invention, and the slurry ice tank 14 corresponds to the slurry ice tank of the present invention.

[0025] As shown in Figure 1(a), the slurry ice washing device 10 has an agitation motor 16, and a vertical agitation shaft 18 is connected to the rotation shaft (not shown) of the agitation motor 16. The agitation shaft 18 is housed in the slurry ice tank 14, and an agitation blade 20 is connected to the agitation shaft 18. The agitation blade 20 is immersed in the slurry ice in the slurry ice tank 14. The agitation blade 20 agitates the slurry ice as it is rotated by the agitation motor 16.

[0026] As shown in Figure 1(a), the slurry ice washing device 10 has an injection mechanism 50. This injection mechanism 50 injects slurry ice and tap water separately into the pipe to be washed B, and corresponds to the injection mechanism of the present invention. This injection mechanism 50 is configured as follows.

[0027] As shown in Figure 1(a), the injection mechanism 50 has a flow path switching valve 30. This flow path switching valve 30 is a three-way valve with two input ports and one output port (neither of which is shown). One end of an inner pipe 30a is connected to the output port of this flow path switching valve 30, and the other end of the inner pipe 30a opens to the outside of the slurry ice washing apparatus 10. One end of an outer pipe 24 is detachably connected to the other end of the inner pipe 30a.

[0028] 1(a), one end of a slurry ice injection pipe 22 is connected to one input port of the flow path switching valve 30, and the other end of the slurry ice injection pipe 22 is connected to the inside of the slurry ice tank 14 at the lowest part of the slurry ice tank 14. One end of a tap water injection pipe 26 is connected to the other input port of the flow path switching valve 30, and the other end of the tap water injection pipe 26 opens to the outside of the slurry ice washing device 10. One end of an auxiliary water pipe 28 is detachably connected to the other end of the tap water injection pipe 26, and the other end of the auxiliary water pipe 28 is detachably connected to a public water pipe via a water faucet (neither is shown).

[0029] The flow path switching valve 30 is a solenoid valve that is switched between a slurry ice injection mode, a tap water injection mode, and an injection stop mode by receiving an electrical signal. One input port and one output port of the flow path switching valve 30 are open in the slurry ice injection mode, and the other input port is closed in the slurry ice injection mode. In the slurry ice injection mode, the flow path switching valve 30 allows slurry ice in the slurry ice tank 14 to be injected from the slurry ice injection pipe 22 through the inner pipe 30a into the outer pipe 24. This slurry ice injection mode corresponds to the first injection mode of the present invention, and the arrow M1 in Figure 1(a) indicates the flow direction of the slurry ice in the slurry ice injection mode.

[0030] The other input port and output port of the flow path switching valve 30 are each open in the tap water injection mode, and the other input port is closed in the tap water injection mode. In the tap water injection mode of the flow path switching valve 30, tap water is injected from the public water pipe through the auxiliary water pipe 28, the tap water injection pipe 26, and the inner pipe 30a into the external pipe 24 by water pressure from the water pipe. This tap water injection mode corresponds to the second injection mode of the present invention, and tap water corresponds to the water of the present invention. Arrow M2 in Figure 1(a) indicates the direction of tap water flow in the tap water injection mode. The output port of the flow path switching valve 30 is closed in the injection stop mode, and in the injection stop mode of the flow path switching valve 30, neither the slurry ice in the slurry ice tank 14 nor the tap water from the public water pipe is injected into the external pipe 24.

[0031] 1(a), the slurry ice washing device 10 has an output pump 32, which corresponds to the pump of the present invention. This output pump 32 is interposed in the slurry ice injection pipe 22 upstream of the flow path switching valve 30 in the direction of the slurry ice flow. This output pump 32 discharges the slurry ice in the slurry ice tank 14 into the slurry ice injection pipe 22. When this output pump 32 is operated in the slurry ice injection mode, the slurry ice in the slurry ice tank 14 is injected from the slurry ice injection pipe 22 through the inner pipe 30a into the outer pipe 24 by the discharge pressure of the output pump 32. The injection mechanism 50 is configured as described above.

[0032] As shown in FIG. 1(a), the slurry ice washing apparatus 10 has an operation panel 34. This operation panel 34 is equipped with an automatic operation switch 36, an agitation switch 38, and a cleaning circuit 40. The automatic operation switch 36 and the agitation switch 38 are each positioned so that they can be operated manually by an operator, and the agitation motor 16 is alternately switched between an operating state and an operation-stopped state each time the agitation switch 38 is operated. The automatic operation switch 36 outputs an operation start command to the cleaning circuit 40. This cleaning circuit 40 has a timer circuit and a relay circuit (neither of which are shown). This cleaning circuit 40 switches the flow path switching valve 30 between a slurry ice injection mode, a tap water injection mode, and an injection-stopped mode, and switches the output pump 32 between an operation-stopped state and an operating state. This cleaning circuit 40 corresponds to the cleaning means of the present invention.

[0033] Before cleaning pipe B, the storing process, transporting process, and piping process are performed by an operator. The storing process is a process of storing slurry ice in slurry ice tank 14. In this storing process, an operator connects slurry ice washing device 10 to slurry ice production device A via connecting pipes P1 and P2. With slurry ice washing device 10 and slurry ice production device A connected, the operator puts slurry ice production device A into operation and stores slurry ice at "-2.0°C" from slurry ice production device A in slurry ice tank 14.

[0034] In the transportation process, an operator transports the slurry ice washing apparatus 10 to the installation location of the pipe to be cleaned B. In this transportation process, the operator removes connecting pipes P1 and P2 from between the slurry ice production apparatus A and the slurry ice washing apparatus 10, and operates the stirring switch 38 to rotate the stirring blade 20. With the stirring blade 20 rotating, the operator transports the slurry ice washing apparatus 10 to the installation location of the pipe to be cleaned B. While the slurry ice washing apparatus 10 is being transported, the stirring blade 20 stirs the slurry ice in the slurry ice tank 14, preventing the slurry ice from separating into water and ice. When this transportation process is complete, the operator operates the stirring switch 38 to stop stirring the slurry ice.

[0035] The piping process is a process in which an operator connects the slurry ice washing device 10 to the inlet Bi of the pipe to be cleaned B via the external pipe 24, and cleaning of the inside of the pipe to be cleaned B is started by the operator operating the automatic operation switch 36 after the piping process is completed. This piping process is carried out with the stirring of the slurry ice stopped. After the connection work of the slurry ice washing device 10 to the pipe to be cleaned B is completed, the operator operates the stirring switch 38 to rotate the stirring blades 20 again, and the slurry ice in the slurry ice tank 14 is stirred again. After this stirring of the slurry ice has been carried out for a predetermined time, the operator operates the stirring switch 38 to stop the stirring of the slurry ice again.

[0036] 2(a), the cleaning circuit 40 starts a cleaning operation when the automatic operation switch 36 is operated. This cleaning operation consists of a first unit cleaning operation (see S1) and a second unit cleaning operation (see S2). Each of these unit cleaning operations is performed by the cleaning circuit 40 controlling the flow path switching valve 30 and the output pump 32, respectively, and when the second unit cleaning operation is completed, the cleaning circuit 40 sets the flow path switching valve 30 to the injection stop mode (see S3).

[0037] 2(a), the cleaning circuit 40 continues the injection stop mode of the flow path switching valve 30 for a certain period of time. When the injection stop mode of the flow path switching valve 30 continues for a certain period of time, the cleaning circuit 40 transitions from S3 to S4, the rinsing operation, and the flow path switching valve 30 is switched from the injection stop mode to the tap water injection mode. This rinsing operation rinses the inside of the pipe B to be cleaned by injecting tap water into the pipe B to be cleaned, and is intended to thoroughly discharge the slurry ice that was filled into the pipe B to be cleaned during the filling operation (described later) from the inside of the pipe B to be cleaned.

[0038] The cleaning circuit 40 continues the rinsing operation for a fixed rinsing time Tl. This rinsing time Tl is set to a length that allows the entire area inside the pipe B to be cleaned to be sufficiently rinsed with the flow of tap water, and is set to the same length as the tap water injection time Tw (described below). When the rinsing operation is completed, the cleaning circuit 40 transitions from S4 to S, and the flow path switching valve 30 is switched from the tap water injection mode to the injection stop mode. This rinsing operation corresponds to the rinsing operation of the present invention.

[0039] 2(b) is an explanatory diagram of the operation of each unit cleaning operation, in which the cleaning circuit 40 starts a cleaning operation by switching the flow path switching valve 30 from the injection stop mode to the slurry ice injection mode (see S11). When the flow path switching valve 30 is switched to the slurry ice injection mode, the cleaning circuit 40 switches the output pump 32 from the operation stop state to the operation state (see S12). When the output pump 32 is in the operation state, slurry ice is injected from the slurry ice cleaning device 10 into the pipe B to be cleaned through the inlet Bi of the pipe B to be cleaned.

[0040] The cleaning circuit 40 keeps the output pump 32 in operation for a fixed slurry ice injection time Ts, and switches the output pump 32 from an operating state to an operating stopped state when slurry ice has been injected into the pipe B to be cleaned for the slurry ice injection time Ts. This slurry ice injection time Ts is set to the time required for slurry ice to fill the pipe B to be cleaned from the inlet Bi to the outlet Be, and for subsequent slurry ice to push the slurry ice near the outlet Be inside the pipe B to be cleaned out through the outlet Be. This slurry ice injection time Ts corresponds to the first predetermined time of the present invention, and S12 corresponds to the filling operation and the dirt removing operation of the present invention.

[0041] When the output pump 32 is switched to the operation stop state, the cleaning circuit 40 switches the flow path switching valve 30 to the injection stop mode (see S13). After switching the flow path switching valve 30 to the injection stop mode, the cleaning circuit 40 switches from the injection stop mode to the tap water injection mode, thereby starting to inject tap water from the slurry ice cleaning device 10 into the pipe B to be cleaned (see S14).

[0042] The injection mechanism 50 injects slurry ice into the pipe to be cleaned B through the filling operation in S12 so that the flow rate of the slurry ice in the pipe to be cleaned B becomes "Q1 (18 L / min)" and the flow velocity of the slurry ice in the pipe to be cleaned B becomes "V1 (20 cm / min)". This velocity V1 corresponds to the predetermined velocity in this invention. The injection mechanism 50 injects tap water into the pipe to be cleaned B through the water injection operation in S14 so that the flow rate of the tap water in the pipe to be cleaned B becomes "Q2 (60 L / min)" and the flow velocity of the tap water in the pipe to be cleaned B becomes "V2 (66.6 cm / min)". In other words, the injection mechanism 50 injects tap water into the pipe to be cleaned B at a velocity V2 that is faster than the flow velocity V1 of the slurry ice. This speed V2 corresponds to a speed faster than the predetermined speed of the present invention, and is the speed at which the slurry ice filled into the pipe B during the filling operation is pushed out of the pipe B by the current of tap water at a speed faster than the free-moving speed of the slurry ice within the pipe B. This injection mechanism 50 injects tap water with a lower salinity (0.02%) than the salinity of the slurry ice (1.0%) into the pipe B to be cleaned in S14. This injection mechanism 50 injects tap water at a room temperature, which is higher than the temperature of the slurry ice (-2.0°C), into the pipe B to be cleaned in S14. The maximum salinity contained in what is considered normal tap water is 200 mg / L = 0.02%. In contrast, the minimum salinity required to produce slurry ice is 1.0%, so the relationship is always "salt concentration of tap water < salinity of slurry ice." In addition, the temperature of tap water in cold weather is "about 5°C," and the temperature of tap water in severe winter is "about 2°C," so the temperature of tap water is always higher than the temperature of slurry ice, "-2.0°C," regardless of the season.

[0043] The cleaning circuit 40 continues the tap water injection mode of the flow path switching valve 30 for a fixed tap water injection time Tw, and tap water is injected from the slurry ice cleaning device 10 into the pipe B to be cleaned for the tap water injection time Tw. This tap water injection time Tw is the time required for the water flow to flush all of the slurry ice packed inside the pipe B from the end face of the pipe B to be cleaned, and the tap water injection time Tw and the slurry ice injection time Ts are set to the same length. This tap water injection time Tw corresponds to the second predetermined time of the present invention, and S14 corresponds to the water injection operation of the present invention. In other words, a unit cleaning operation consists of one filling operation and one water injection operation, and a cleaning operation consisting of two unit cleaning operations consists of alternating filling operations and water injection operations. This water injection operation corresponds to the liquid injection operation of the present invention.

[0044] The reducer 60 in Figure 1(a) is used by an operator by pressing it against the end face of the straight pipe section B1 of the pipe B to be cleaned. As shown in Figure 1(b), this reducer 60 has a reducer body 62. This reducer body 62 is tubular with a starting end face and an ending end face. The outer shape of the starting end face of this reducer body 62 is circular, the same as the outer shape of the ending face of the straight pipe section B1, and the outer diameter of the starting end face of the reducer body 62 is the same as the outer diameter of the ending face of the straight pipe section B1.

[0045] As shown in Figure 1(b), the start end of the reducer body 62 is an open slurry inlet 64, and the end end of the reducer body 62 is an open slurry outlet 66. Slurry ice is supplied to the slurry inlet 64 from the outlet Be of the pipe B to be cleaned. The shape of this slurry inlet 64 is the same as the shape of the outlet Be, which is circular, and the diameter of the slurry inlet 64 is the same as the diameter of the outlet Be. This slurry inlet 64 corresponds to the slurry inlet of this invention.

[0046] The slurry outlet 66 of the reducer body 62 discharges the slurry ice from inside the reducer body 62. The shape of this slurry outlet 66 is circular, the same as the shape of the slurry inlet 64. The diameter of this slurry outlet 66 is set smaller than the diameter of the slurry inlet 64, and the area of ​​the slurry outlet 66 is set to be 0.5 to 0.7 times the area of ​​the slurry inlet 64. This slurry outlet 66 corresponds to the slurry outlet of this invention.

[0047] As shown in Figure 1(b), the inner surface of the reducer body 62 is a truncated cone shape that continues to decrease in diameter from the slurry inlet 64 to the slurry outlet 66. That is, the reducer body 62 has an inner surface that connects the slurry inlet 64 and the slurry outlet 66 with a single surface, and the inclination angle D of the inner surface of the reducer body 62 with respect to the axial line AL is set to a constant value less than "90°". The starting end face of this reducer body 62 is pressed against the terminal end face of the straight pipe section B1. When this reducer body 62 is pressed concentrically against the straight pipe section B1, the slurry inlet 64 overlaps with the outlet Be of the pipe to be cleaned B when viewed from the direction of the axial line AL.

[0048] The reducer 60 is pressed by an operator with his or her fingers before the start of the first water injection operation. This reducer 60 is temporarily removed from the end face of the straight pipe section B1 when the first water injection operation is stopped. This reducer 60 is pressed against the end face of the straight pipe section B1 again before the start of the second water injection operation, and is removed from the outlet Be of the straight pipe section B1 when the second water injection operation is stopped. This reducer 60 corresponds to the tubular part of the present invention.

[0049] During the water injection operation in S14, the reducer 60 supplies the slurry ice in the pipe B to be cleaned from the outlet Be of the pipe B through the slurry inlet 64, and the slurry ice in the reducer 60 is discharged through the slurry outlet 66. The reducer 60's slurry outlet 66 restricts the flow of fluid, and during the water injection operation in S14, the reducer 60 applies flow resistance to the slurry ice in the pipe B to be cleaned.

[0050] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, slurry ice is injected into the pipe B to be washed for the slurry ice injection time Ts during the filling operation in S12, thereby filling the pipe B to be washed from the inlet Bi to the outlet Be with slurry ice. When the water injection operation in S14 is started after this filling operation is completed, the slurry ice packed on the outer periphery of the bent portion Bb is swept away by the current of tap water preferentially compared to the slurry ice packed on the inner periphery of the bent portion Bb (see arrow Out in FIG. 3). As a result, the slurry ice packed on the inner periphery of the bent portion Bb is left behind in small lumps on the inner periphery of the bent portion Bb (see symbol SI in FIG. 3), and the tap water directly collides with the small lumps of slurry ice.

[0051] According to the slurry ice washing apparatus and method of Example 1, tap water is injected into the pipe B for the tap water injection time Tw during the water injection operation in S14 at a flow rate V2 that is faster than the flow rate V1 of the slurry ice, so that the tap water continuously applies a strong external force to the small lumps of slurry ice, causing them to peel off from the inner periphery of the bent portion Bb and be swept away from the outlet Be of the pipe B by the water flow.

[0052] Moreover, the filling operation and the water injection operation are repeated alternately. Therefore, the current water injection operation washes away small lumps of slurry ice from the pipe B to be cleaned, and the next filling operation is started with the pipe B to be cleaned having been removed and its cleaning ability restored. Therefore, if dirt S (see Figure 3) is attached to the inner periphery of the bent portion Bb, the dirt S will be scraped off in the next filling operation, making it possible to thoroughly clean the inside of the pipe B to be cleaned, which has the bent portion Bb. Furthermore, since the rinsing operation is started after the cleaning operation is completed, it is possible to rinse the inside of the pipe B to be cleaned with tap water.

[0053] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, tap water is injected from the water pipe into the pipe to be washed by the water pressure of the water pipe during the water injection operation in S14. This eliminates the need for a tank for storing water and a high-pressure pump for injecting water from the tank at high pressure into the pipe to be washed B, thereby simplifying the configuration of the slurry ice washing apparatus 10. Furthermore, there is no need to refill the tank with water every time the inside of the pipe to be washed B is washed.

[0054] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, when the injection of tap water into the pipe to be washed B begins during the water injection operation in S14, slurry ice flows from the outlet Be of the pipe to be washed B through the slurry inlet 64 and into the reducer 60. This slurry ice is discharged from the slurry outlet 66 of the reducer 60. The flow of this slurry ice is narrowed at the slurry outlet 66 of the reducer 60. This increases the flow resistance of the slurry ice within the pipe to be washed B, so that the slurry ice is pushed through the pipe to be washed B in a state where it is filled from the bottom to the ceiling during the water injection operation in S14. Therefore, the deposits inside the pipe to be washed B are sufficiently polished by the slurry ice, making it possible to more thoroughly clean the inside of the pipe to be washed B.

[0055] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, the slurry ice is discharged from the slurry outlet 66 to the outside of the reducer 60. Therefore, if the pipe to be cleaned B has a branch pipe, it is possible to prevent the slurry ice from overflowing from the pipe to be cleaned B and flowing into the branch pipe. Furthermore, unlike when the inside of the pipe to be cleaned B is cleaned by moving the pig along the inner surface of the pipe to be cleaned B, the pig will not become clogged inside the pipe to be cleaned. Furthermore, because there is no need to inject the pig into the pipe to be cleaned B at high pressure, there is also no need to use a high-pressure injection pump as the output pump 32.

[0056] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, the slurry inlet 64 is provided with the same shape and size as the outlet Be of the pipe to be washed B, so that the slurry ice from the outlet Be flows smoothly into the reducer 60 through the slurry inlet 64. Moreover, because the area of ​​the slurry outlet 66 is set smaller than the area of ​​the slurry inlet 64, the flow of the slurry ice is mainly restricted at the slurry outlet 66. Therefore, by adjusting the area, shape, etc. of the slurry outlet 66 in the design, it is easy to set the flow resistance of the slurry ice inside the pipe to be washed B as intended.

[0057] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, the inner surface of the reducer 60 is shaped so that the diameter of the reducer 60 continues to decrease from the slurry inlet 64 to the slurry outlet 66. This eliminates any sudden changes in the inner surface shape that could cause deposits scraped off by the slurry ice to accumulate, allowing the deposits scraped off by the slurry ice to be smoothly discharged together with the slurry ice from the slurry outlet 66. This allows the operator to accurately grasp the progress of the cleaning work by visually checking the cleanliness of the slurry ice discharged from the slurry outlet 66. Furthermore, the operator can easily clean the inside of the reducer 60 by inserting a cleaning tool into the reducer body 62 through the slurry inlet 64 or the slurry outlet 66.

[0058] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, the slurry ice in the slurry ice tank 14 is stirred by the stirring blades 20 in the piping process before the slurry ice is poured from the slurry ice washing apparatus 10 into the pipe to be washed B. This makes it difficult for the slurry ice poured into the pipe to be washed B from the slurry ice washing apparatus 10 in the filling process of S12 to separate into water and ice inside the pipe to be washed B. This makes it easier to fill the pipe to be washed B from the bottom to the ceiling with slurry ice.

[0059] According to the slurry ice washing apparatus and slurry ice washing method of the first embodiment, tap water, which is hotter than the slurry ice, comes into contact with the slurry ice during water injection operation. The temperature difference causes the slurry ice to melt, reducing its volume. This generates negative pressure inside the pipe B to be washed, which draws the hotter tap water, which has lower viscosity, toward the side where the negative pressure is generated. When this tap water is drawn toward the side where the negative pressure is generated, the contact between the slurry ice and the tap water is less likely to become loose, so the tap water flows inside the pipe B to be washed, firmly pushing against the rear area of ​​the slurry ice that is closest to the tap water. Therefore, regardless of the position of the small lumps of slurry ice, the tap water reaches the small lumps of slurry ice, which are then detached and pushed away by the flow of tap water.

[0060] Furthermore, the cleaning operation is performed by alternately repeating the filling operation and the water injection operation. Therefore, the small lumps of slurry ice are washed away from the pipe B to be cleaned during the water injection operation, and the next filling operation is started in a state where the cleaning ability has been restored and the small lumps of slurry ice have been removed from the pipe B to be cleaned. Therefore, the inside of the pipe B to be cleaned can be thoroughly cleaned.

[0061] In the above-described first embodiment, the inner surface of the reducer 60 is provided in a frusto-conical shape, but it may also have the shape of, for example, the second or third embodiment of the present invention. The second and third embodiments of the present invention also achieve the same effects as the first embodiment. Hereinafter, the second and third embodiments of the present invention will be described. [Example]

[0062] 4(a), the reducer 60 has an inlet-side main body portion 62a and an outlet-side main body portion 62b. The inlet-side main body portion 62a is half of the reducer main body 62, and the inlet-side main body portion 62a is provided to include a slurry inlet 64. The outlet-side main body portion 62b is the remaining portion of the reducer main body 62 excluding the inlet-side main body portion 62a, and the outlet-side main body portion 62b is provided to include a slurry outlet 66. The inclination angle D2 of the inner surface of the outlet-side main body portion 62b with respect to the axial line AL is set to an acute angle, and the inclination angle D1 of the inner surface of the inlet-side main body portion 62a with respect to the axial line AL is set to an acute angle larger than the inclination angle D2. [Example]

[0063] As shown in FIG. 4(b), the reducer 60 has an inner surface shape that connects the slurry inlet 64 and the slurry outlet 66 with one smooth curved surface.

[0064] In the above-described first to third embodiments, the entire inner surface of the reducer 60 is formed in a shape inclined with respect to the axial line AL, but this may also be the shape of the fourth embodiment of the present invention. The fourth embodiment of the present invention also achieves the same effects as the first embodiment. Hereinafter, the fourth embodiment of the present invention will be described. [Example]

[0065] 5(a), the reducer body 62 has a start-side straight pipe section 62c, a terminal-side straight pipe section 62d, and a connecting pipe section 62e. The start-side straight pipe section 62c has a straight pipe shape, and is provided to include a slurry inlet 64. The inner surface of this start-side straight pipe section 62c is formed in a circular shape with the same diameter as the slurry inlet 64, and the outer diameter of the start-side straight pipe section 62c is set to be the same as the outer diameter of the start end face of the reducer body 62.

[0066] As shown in Figure 5(a), the terminal end straight pipe section 62d has a straight pipe shape, and is provided to include a slurry outlet 66. The inner surface of this terminal end straight pipe section 62d is circular and has the same diameter as the slurry outlet 66. The connecting pipe section 62e connects the start end straight pipe section 62c and the terminal end straight pipe section 62d, and the inner surface of the connecting pipe section 62e is frustoconical, with the diameter continuously decreasing from the end face on the start end straight pipe section 62c side to the end face on the terminal end straight pipe section 62d side.

[0067] According to the slurry ice washing device and slurry ice washing method of the fourth embodiment, the straight terminal pipe section 62d including the slurry outlet 66 is provided at the terminal end of the reducer 60, which gives directionality to the discharge direction of the slurry ice from the slurry outlet 66. Therefore, the slurry ice from the slurry outlet 66 can be received in a container or the like, which makes it possible to prevent the slurry ice from scattering onto the floor surface.

[0068] According to the slurry ice washing apparatus and slurry ice washing method of the fourth embodiment, the reducer 60 is provided at its starting end with a straight pipe-like starting end section 62c including a slurry inlet 64. This allows an operator to stably hold the starting end section 62c with his or her fingers when aligning the slurry inlet 64 concentrically with the outlet Be of the pipe to be washed B. This makes it easier to handle the reducer body 62.

[0069] According to the slurry ice washing apparatus and method of the fourth embodiment, the reducer body 62 is provided with a connecting pipe section 62e, and the inner surface of the connecting pipe section 62e is designed to have a circular shape that continuously decreases in diameter from the end face of the starting straight pipe section 62c to the end face of the terminal straight pipe section 62d. This prevents the connecting pipe section 62e from undergoing abrupt changes in the inner surface shape that could allow deposits scraped off by the slurry ice to accumulate. This allows the operator to visually check the cleanliness of the slurry ice discharged from the slurry outlet 66 and accurately grasp the progress of the washing operation. Furthermore, the length L of the portion of the inner surface of the reducer body 62 that slopes downward in the direction of the slurry ice flow is shortened. This increases the inclination angle D3 of the inner surface of the connecting pipe section 62e relative to the axial line AL, further increasing the flow resistance of the slurry ice within the pipe B to be washed. Therefore, the slurry ice is easily washed away while remaining filled from the bottom to the ceiling of the pipe to be cleaned B, making it possible to clean the inside of the pipe to be cleaned B more thoroughly.

[0070] In the above-described fourth embodiment, the inner surface of the connecting pipe portion 62e of the reducer body 62 is formed in a frusto-conical shape, but it may also have the shape of, for example, the fifth or sixth embodiment of the present invention. The fifth and sixth embodiments of the present invention also achieve the same effects as the fourth embodiment. Hereinafter, the fifth and sixth embodiments of the present invention will be described. [Example]

[0071] 5(b), the connecting pipe portion 62e of the reducer body 62 has a starting connecting pipe portion 62f and a terminal connecting pipe portion 62g. The starting connecting pipe portion 62f is the starting half of the connecting pipe portion 62e, and the terminal connecting pipe portion 62g is the remaining portion of the connecting pipe portion 62e excluding the starting connecting pipe portion 62f. The inclination angle D5 of the inner surface of this terminal connecting pipe portion 62g with respect to the axial line AL is set to an acute angle, and the inclination angle D4 of the inner surface of the starting connecting pipe portion 62f with respect to the axial line AL is set to an acute angle larger than the inclination angle D5. [Example]

[0072] As shown in FIG. 5(c), the connecting pipe portion 62e of the reducer main body 62 has an inner surface shape that connects both end faces of the connecting pipe portion 62e with one smoothly curved surface.

[0073] In the above-described first to sixth embodiments, the slurry ice injection time Ts in the filling operation in S12 and the tap water injection time Tw in the water injection operation in S14 may be made different.

[0074] In the above Examples 1 to 6, the slurry ice injection time Ts during the filling operation in S12 may be set to a length that allows the slurry ice to overflow from the pipe to be cleaned B. In short, the slurry ice injection time Ts should be set to a length that allows the slurry ice to be filled into the pipe to be cleaned B.

[0075] In the above embodiments 1 to 6, it is advisable to press the reducer 60 against the end face of the straight pipe section B1 of the pipe to be cleaned B before the first filling operation is started, and then remove the reducer 60 from the end face of the straight pipe section B1 when the second water injection operation is completed. In short, it is sufficient to apply flow resistance to the slurry ice in the pipe to be cleaned B by discharging the slurry ice from the pipe to be cleaned B through the reducer 60.

[0076] In the above Examples 1 to 6, the tap water injection time Tw in the water injection operation in S14 may be set shorter than the slurry ice injection time Ts in the filling operation in S12. The point is to set the tap water injection time Tw to a length that allows the slurry ice filled in the pipe B to be cleaned in the filling operation in S12 to be pushed out from the end face of the pipe B to be cleaned by the water flow.

[0077] In the above Examples 1 to 6, slurry ice made of salt water with a concentration other than "1.0%" may be injected into the pipe to be cleaned B during the filling operation of S12. In this case, the salt concentration of the slurry ice is preferably within the range of "0.5%≦salinity≦2.0%".

[0078] In the above embodiments 1 to 6, the slurry ice production device A may be configured to produce slurry ice by supercooling water containing water-soluble solutes such as urea or sugar. That is, slurry ice containing water-soluble solutes such as urea or sugar may be injected into the pipe to be cleaned B in the filling operation of S12. In this case, it is preferable to inject water with a lower urea concentration than the slurry ice or water such as tap water with a lower sugar concentration into the pipe to be cleaned B in the water injection operation of S14.

[0079] In the above-mentioned Examples 1 to 6, tap water from the water pipe may be heated by a heating source such as an electric heater, and tap water at a higher temperature than room temperature may be injected into the pipe to be cleaned B in the water injection step S14. In this case, it is preferable to wrap a heater around the outer periphery of the tap water injection pipe 26 and heat the tap water inside the tap water injection pipe 26 with the heater.

[0080] In the above-described first to sixth embodiments, a configuration may be adopted in which only one unit cleaning operation is performed when the automatic operation switch 36 is operated.

[0081] In the above embodiments 1 to 6, a tank for storing saltwater with a salinity of 1.0% for producing slurry ice may be provided, and tap water from a water pipe may be added to the tank to produce diluted water with a salinity of less than 1.0%. In this configuration, it is preferable to provide a pump for pumping the diluted water from the tank, and to inject the diluted water into the pipe B to be cleaned by the pump during the water injection operation in S14.

[0082] In the above embodiments 1 to 6, the flow path switching valve 30 may be configured by both an on-off valve disposed in the slurry ice injection pipe 22 and an on-off valve disposed in the tap water injection pipe 26. This flow path switching valve 30 is placed in the slurry ice injection mode when the on-off valve of the slurry ice injection pipe 22 is opened and the on-off valve of the tap water injection pipe 26 is closed. This flow path switching valve 30 is placed in the tap water injection mode when the on-off valve of the tap water injection pipe 26 is opened and the on-off valve of the slurry ice injection pipe 22 is closed. This flow path switching valve 30 is placed in the injection stop mode when both the on-off valve of the slurry ice injection pipe 22 and the on-off valve of the tap water injection pipe 26 are closed.

[0083] In the above-described first to sixth embodiments, the slurry ice injection time Ts in the filling operation in S12, the tap water injection time Tw in the water injection operation in S14, and the rinsing time Tl in S4 may each be adjustable. In this case, it is preferable that the operator operates a control such as a dial to individually input the slurry ice injection time Ts, the tap water injection time Tw, and the rinsing time Tl into the cleaning circuit 40. With this configuration, it becomes possible to thoroughly clean the insides of a plurality of types of pipes B to be cleaned, each having a different pipe length.

[0084] In the above-mentioned Examples 1 to 6, tap water may be intermittently injected into the pipe to be cleaned B by switching the flow path switching valve 30 between the tap water injection mode and the injection stop mode multiple times during the water injection operation of S14. In this configuration, a strong impact force is intermittently applied from the tap water to the small lumps of slurry ice multiple times, making it easier for the small lumps of slurry ice to peel off from the inner periphery of the bent portion Bb.

[0085] In the above-mentioned Examples 1 to 6, the inner surface of the reducer body 62 may be formed in a vertically asymmetric shape. It is preferable that the inner surface of the reducer body 62 be formed in a vertically asymmetric shape in which the volume of the upper half of the reducer body 62 is smaller than the volume of the lower half of the reducer body 62. With this configuration, the slurry ice is more reliably filled from the bottom to the ceiling of the pipe B to be cleaned.

[0086] In the above-mentioned first to sixth embodiments, the flow of the slurry ice may be restricted by arranging an orifice plate, a punched metal, or the like in the reducer body 62.

[0087] In the above-described first to sixth embodiments, the slurry outlet 66 of the reducer body 62 may be rectangular, and the key point is that the area of ​​the slurry outlet 66 should be set smaller than the area of ​​the slurry inlet 64 .

[0088] In the above-described Examples 1 to 6, the diameter of the slurry inlet 64 may be set to be approximately the same as the diameter of the outlet Be of the pipe to be cleaned B. This "approximately the same" means that the diameter of the slurry inlet 64 and the diameter of the outlet Be differ within a range that allows the starting end face of the reducer 60 to be pressed concentrically against the terminal end face of the straight pipe section B1.

[0089] In the above-described first to sixth embodiments, a flushing operation consisting of a filling operation, a water injection operation, a filling operation, a water injection operation, and a filling operation may be performed, and a rinsing operation may be performed after the final filling operation. In short, it is sufficient to perform a flushing operation consisting of alternately repeating filling operations and water injection operations, and the number of filling operations and the number of water injection operations may differ. In the above-mentioned first to sixth embodiments, the slurry ice washing device 10 may be used to wash the inside of a pipe B to be washed used for manufacturing pharmaceutical products, cosmetics, or chemical substances. [Explanation of symbols]

[0090] 10: Slurry ice cleaning device, 14: Slurry ice tank, 32: Output pump (pump), 40: Cleaning circuit (cleaning means), 50: Injection mechanism, 60: Reducer (tubular part), 64: Slurry inlet, 66: Slurry outlet, B: Pipe to be cleaned, Bb: Bent section, Bi: Inlet, Be: Outlet, S12: Filling operation (stain removal operation), S14: Water injection operation (liquid injection operation), Ts: Slurry ice injection time (first predetermined time), Tw: Tap water injection time (second predetermined time), V1: Predetermined speed, V2: Speed ​​higher than the predetermined speed

Claims

1. A slurry ice washing device for washing the inside of a pipe to be washed with the slurry ice, the slurry ice being a mixture of a solution in which a solute is dissolved and fine solid particles of the solution, the slurry ice having an inlet for injecting the slurry ice, an outlet for discharging the slurry ice, and a bent portion located between the inlet and the outlet, an injection mechanism having a first injection mode for injecting the slurry ice into the pipe to be cleaned and a second injection mode for injecting the solution having a temperature higher than that of the slurry ice into the pipe to be cleaned; a cleaning means for cleaning the inside of the pipe to be cleaned by switching the injection mechanism between the first injection mode and the second injection mode, The cleaning means is a filling operation in which the slurry ice is injected into the pipe to be cleaned for a first predetermined time in the first injection mode of the injection mechanism, and a liquid injection operation which is started after the filling operation is completed and in which the solution is injected into the pipe to be cleaned for a second predetermined time in the second injection mode of the injection mechanism, thereby washing out the slurry ice filled in the pipe to be cleaned by the flow of the solution, A slurry ice cleaning device characterized in that the first predetermined time is the time it takes for the slurry ice to be filled from the inlet to the outlet and for the slurry ice in the pipe to be cleaned to be pushed out of the outlet by the subsequent slurry ice.

2. 2. The slurry ice cleaning device according to claim 1, wherein the cleaning means starts a rinsing operation to rinse the inside of the pipe to be cleaned by injecting the solution into the pipe to be cleaned in the second injection mode of the injection mechanism after completing the cleaning operation.

3. a slurry ice tank for storing the slurry ice; The injection mechanism includes: In the first injection mode, the slurry ice is injected from the slurry ice tank into the pipe to be cleaned by the discharge pressure of a pump; 3. The slurry ice washing apparatus according to claim 1, wherein in the second injection mode, tap water from a water pipe is injected as the solution into the pipe to be washed by the water pressure of the water pipe.

4. A slurry ice cleaning method for cleaning the inside of a pipe to be cleaned with slurry ice, the pipe having an inlet for injecting slurry ice, the slurry ice being a mixture of a solution in which a solute is dissolved and fine solid particles of the solution, an outlet for discharging the slurry ice, and a bent portion located between the inlet and the outlet, comprising: an injection mechanism having a first injection mode for injecting the slurry ice into the pipe to be cleaned and a second injection mode for injecting water at a temperature higher than that of the slurry ice into the pipe to be cleaned; a cleaning operation is performed by alternately repeating a filling operation in which the slurry ice is injected into the pipe to be cleaned for a first predetermined time using the first injection mode of the injection mechanism, and a liquid injection operation which is started after the filling operation is completed and in which the solution is injected into the pipe to be cleaned for a second predetermined time using the second injection mode of the injection mechanism, thereby washing out the slurry ice filled in the pipe to be cleaned by the flow of the solution; A slurry ice cleaning method characterized in that the first predetermined time is the time it takes for the slurry ice to be filled from the inlet to the outlet and for the slurry ice in the pipe to be cleaned to be pushed out of the outlet by the subsequent slurry ice.

5. The device is for restricting the flow of a fluid, and uses a tubular part having a starting end surface and a terminal end surface, the starting end being an open slurry inlet and the terminal end being an open slurry outlet, 5. The slurry ice cleaning method according to claim 4, wherein the slurry ice in the pipe to be cleaned is supplied from the pipe to be cleaned through the slurry inlet into the tubular part and discharged from the tubular part through the slurry outlet.

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