JP4956572B2 - Continuous washing machine and continuous washing method - Google Patents

Description

  The present invention relates to a continuous washing machine and a continuous washing method.

  Conventionally, as a washing machine for business use, there is known a continuous washing machine in which a plurality of pre-washing, main-washing and rinsing tubs are arranged side by side, and washing is performed continuously while moving an object to be washed between the tubs. (For example, refer to Patent Document 1 below). The continuous washing machine has a counter flow type that allows washing water to flow in the direction opposite to the direction of movement of the washing object. In the counter flow type, a plurality of main washing tanks are pre-washed from the main washing tank located on the rinsing tank side. The washing object is configured to be washed while sending the washing water toward the main washing tank located on the tank side. In addition, as a continuous washing machine, there is a batch flow type machine that performs washing while feeding washing water in the same direction as the object to be washed and the moving direction in a plurality of main washing tubs.

  In such a continuous washing machine, the rinsing water is less dirty than the main washing water, which is the washing water in the main washing tub. Therefore, the water discharged from the rinsing tub is recycled in the continuous washing machine and pre-washed. It is used as pre-wash water and main wash water supplied to the tank.

  On the other hand, washing in the main washing tub is usually heated to 60 to 80 ° C. and is performed using not only a detergent but also an alkali or a bleaching agent. Therefore, the main washing water contains various organic and inorganic dirt, so it is difficult to reuse in the continuous washing machine and sent to the waste water treatment facility, but the main washing water is hot water. It causes the temperature rise of waste water treatment equipment.

  The following Patent Document 2 discloses a technology that uses a heat exchanger to cool water discharged from a rinsing tank. In this document, when the water discharged from the rinsing tank is used as pre-wash water, the water supplied to the rinsing tank is used as cooling water, and heat exchange is performed using the water discharged from the rinsing tank as cooling water. Thereby, while warming the water supplied to a rinse tank, the prewash water supplied to a prewash tank is cooled to 40 degrees C or less. By setting the pre-washing water to 40 ° C. or lower, it is possible to solve the problem that protein stains and blood adhering to the object to be washed tend to coagulate due to heat and become stained.

JP 05-208175 A JP 2006-141786 A

  If the wastewater discharged from the main washing tank is sent directly to the wastewater treatment facility as described above, the temperature of the wastewater treatment facility will increase, so it is possible to reduce the temperature of the wastewater by installing a heat exchanger in the wastewater channel. desired. However, since the main washing water contains various organic and inorganic contaminants as described above, the plate-type heat exchanger is likely to be clogged with contamination, and the heat exchange rate tends to deteriorate. In addition, dismantling and cleaning with special equipment is necessary, and the maintainability is poor.

  In view of the above problems, the present invention is a continuous washing machine capable of effectively using waste heat of wastewater discharged from a main washing tank and suppressing temperature rise of wastewater treatment equipment without impairing maintainability, and An object is to provide a continuous washing method.

  The continuous washing machine according to the present invention includes at least one pre-washing tank, a plurality of main washing tanks, and at least one rinsing tank, and the objects to be washed are sequentially moved from the pre-washing tank to the main washing tank and then to the rinsing tank. In the continuous washing machine that performs washing while moving, supplies washing water to the rinsing tank, and discharges main washing water from the main washing tank to a waste water channel, washing water supplied to the rinsing tank A heat exchanger having a self-cleaning function is provided in the middle of the waste water channel to perform heat exchange using the waste water discharged from the main washing tank as cooling water.

  The continuous washing method according to the present invention includes at least one prewash tank, a plurality of main wash tanks, and at least one rinse tank, and the objects to be washed are sequentially moved from the prewash tank to the main wash tank and then to the rinse tank. In the method of performing washing while moving, supplying washing water to the rinsing tank, and washing using a continuous washing machine that discharges main washing water from the main washing tank to a waste water channel, A heat exchanger having a self-cleaning function is provided in the middle, and washing water supplied to the rinsing tank is used as cooling water, and heat exchange is performed using waste water discharged from the main washing tank as cooling water. To do.

  In the present invention, the heat exchanger is disposed between the inner flow path portion through which the washing water supplied to the rinsing tub flows and the inner flow path portion so as to surround the waste water. An outer container that constitutes an outer flow path through which the inner flow path has a rotating shaft part that is rotatably provided in the outer container, and a hollow part through which the washing water flows. A plurality of plates arranged in parallel in the axial direction of the rotating shaft portion, and having a self-cleaning function for preventing dirt from adhering to the surface of the plate due to rotation of the inner flow path portion having the plate. It is preferable.

  According to the present invention, a heat exchanger is provided in the middle of the waste water channel discharged from the main washing tank, and the temperature of the waste water can be lowered by heat exchange with the washing water supplied to the rinsing tank. Therefore, the temperature rise of the wastewater treatment facility can be suppressed. In particular, since this heat exchanger has a self-cleaning function, the main wash water (waste water) containing various organic and inorganic contaminants prevents the heat exchanger from being clogged and the heat exchange rate from deteriorating. Exchange is possible, the wastewater waste heat can be used effectively, and maintainability can be improved. That is, if the self-cleaning function is not provided, the waste water of the main washing water is clogged immediately, and it is practically difficult to use the waste heat. However, according to the present invention, this problem can be solved.

  According to the present invention, the temperature of the washing water used for the rinsing water can be increased using the waste heat of the waste water. Therefore, the temperature of the object to be cleaned in the rinsing tank can be raised to heat the object to be cleaned before drying, and the drying time can be shortened. As a result, the amount of fuel such as heavy oil used Can be reduced.

It is a typical systematic diagram of the continuous washing machine concerning one embodiment. It is sectional drawing of the heat exchanger in the same embodiment. It is a principal part expansion perspective sectional view of the same heat exchanger.

  Hereinafter, a continuous washing machine according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the continuous washing machine according to the embodiment includes two prewash tanks 1 and 2, seven main wash tanks 3, 4, 5, 6, 7, 8 and 9, and four rinse tanks. The counter flow type continuous washing machine includes 10, 11, 12, and 13, a processing tank 14, and a dehydrator 15.

  The objects to be washed are washed while being sequentially moved from the prewash tanks 1 and 2 to the main wash tanks 3 to 9 and then to the rinse tanks 10 to 13. Specifically, after the article to be washed is put into the prewash tank 1, the prewash tank 2 → the main wash tank 3 → the main wash tank 4 → the main wash tank 5 → the main wash tank 6 → the main wash tank 7 → the main wash tank 8 → Main wash tank 9 → Rinse tank 10 → Rinse tank 11 → Rinse tank 12 → Rinse tank 13 → Processing tank 14 and move sequentially to the right in FIG. After dehydration, the paper is sent to a dryer (not shown) by the conveyor 16. In this washing process, in the present embodiment, the detergent 19 is introduced in the first prewash tank 1, the detergent 20 in the third main wash tank 5 among the seven main wash tanks 3 to 9, and further Usually, a bleaching agent, an alkaline agent, or the like is added to perform washing to remove dirt from the object to be washed. Then, after rinsing is performed in the rinsing tanks 10 to 13, a processing agent 21 such as a glue or a softening agent is introduced into the processing tank 14, and processing such as gluing or softening is performed.

  On the other hand, the washing water basically flows from right to left in FIG. Specifically, the washing water (new water) is supplied to the last rinsing tank 13 among the four rinsing tanks 10 to 13 through the new water pipe 17. The water that has flowed from the rinsing tank 13 to the processing tank 14 together with the object to be washed is drained into the dehydration recovery tank 18 together with the drainage of the dehydrator 15, but the rinse water that has been used in the rinsing tank 13 is not shown in the counter flow. Through a pipe or the like, the objects to be washed are sequentially sent from the rinsing tank 12 to the rinsing tank 11 to the rinsing tank 10 while being rinsed, and are discharged from the first rinsing tank 10 to the rinsing water recovery tank 22. The rinse water recovery tank 22 is provided with a lint screen for removing lint (lint), and the water from which the lint has been removed is stored in the rinse water recovery tank 22.

  The water stored in the dewatering recovery tank 18 and the rinse water recovery tank 22 is sent to the prewash water tank 24 via the pipe 23 by a pump (not shown). In the prewash water tank 24, the water temperature is controlled to 40 ° C. or lower, and water is supplied to the prewash tank 1 via a pump (not shown). The water sent to the pre-washing tank 1 pre-washes the object to be washed, is sent to the next pre-washing tank 2 together with the object to be washed, and is further sent to the first main washing tank 3.

  The water stored in the rinse water recovery tank 22 is also passed through a pipe 29 by a pump (not shown), and the last main wash tank 9 located closest to the rinse tank 10 among the seven main wash tanks 3 to 9. To be supplied. The main washing water used for washing the objects to be washed in the main washing tank 9 passes through a counter flow pipe (not shown) and the like, and then the main washing tank 8 → the main washing tank 7 → the main washing tank 6 → the main washing tank 5 → the main It is sequentially sent from the washing tank 4 to the main washing tank 3. In the main washing tanks 3 to 9, the main washing water is heated to 60 to 80 ° C., and the washing object is washed at such a high temperature. Then, in the first main washing tank 3 located closest to the prewash tank 2, the main wash water is discharged into the waste water channel 25 together with the water sent from the prewash tank 2.

  In the continuous washing machine having such a structure, in the present embodiment, the heat exchanger 26 having a self-cleaning function is provided in the middle of the waste water channel 25 from the main washing tub 3. The heat exchanger 26 performs heat exchange with the washing water (new water) supplied to the rinsing tank 13 as “cooling water” and the waste water discharged from the main washing tank 3 as “cooled water”. While the washing water is below room temperature, the waste water of the main washing water is about 60 to 80 ° C., so that the temperature of the washing water is lowered and the washing water temperature is raised by the heat exchange, for example, Washing water can be raised to 30-40 ° C.

  The self-cleaning function of the heat exchanger 26 is to prevent dirt from adhering to the inner wall surface of the heat exchanger 26 so that the inside of the heat exchanger 26 is not clogged with various organic and inorganic dirt contained in the waste water of the main washing water. And / or if it has the function which can remove this dirt automatically, it will not be limited in particular. As a mechanism for this, for example, the adhesion of dirt to the inner wall surface is prevented by the action of centrifugal force, and the adhered dirt is removed or the scraper means such as a spatula made of an elastic material is attached to the inner wall surface. The thing which scrapes off dirt etc. are mentioned.

  FIG. 2 is a cross-sectional view showing a preferred example of such a heat exchanger 26 having a self-cleaning function. The heat exchanger 26 is provided between the inner flow path portion 27 through which washing water (fresh water) supplied to the rinsing tank 13 flows and the inner flow path portion 27 so as to surround the inner flow path portion 27. And the outer container 30 constituting the outer flow path 28 through which the waste water of the main washing water flows.

  The inner flow path portion 27 includes a rotation shaft portion 31 that is rotatably provided in the outer container 30 and a plurality of plates 32 that are arranged in parallel in the axial direction X of the rotation shaft portion 31.

  The rotating shaft portion 31 includes a sheath portion 33 having an elongated cylindrical shape extending in the axial direction X as a whole shape, and a shaft 34 as a drive shaft disposed on the shaft core portion of the sheath portion 33. A hollow portion 35 through which washing water flows is provided between the inner side and the shaft 34. One end side of the hollow portion 35 of the rotating shaft portion 31 is connected to the upstream side (water supply side) in the fresh water pipe 17, and the other end side is connected to the downstream side (rinse tank 13 side) in the fresh water pipe 17.

  The plate 32 is erected vertically from the sheath portion 33 in the axial direction X, and as shown in FIG. 3, the plate 32 has a disk shape having a hollow portion 36 through which washing water flows. Specifically, the inner flow path portion 27 is formed in a shape in which a plurality of disc-shaped plates 32 are arranged at predetermined intervals and the center is vertically penetrated by the rotation shaft portion 31. The hollow portion 36 of the plate 32 is connected to the hollow portion 35 of the rotating shaft portion 31.

  The shaft 34 of the rotating shaft portion 31 has a disk-like partition wall 37 that extends vertically in the hollow portion 36 of each plate 32 in the axial direction X and partitions the hollow portion 36 into two in the axial direction X. A plurality are provided at predetermined intervals. The partition wall 37 has an outer diameter set smaller than the outer diameter of the plate 32, and connects the front and rear spaces 36 </ b> A and 36 </ b> B partitioned by the partition wall 37 outside the outer peripheral edge 37 </ b> A of the partition wall 37. 36C is provided. As a result, as shown in FIG. 3, the washing water flows from the hollow portion 35 of the rotating shaft portion 31 into the space 36A on the upstream side of each plate 32 radially outward, and passes through the flow passage 36C on the outer peripheral portion. It is configured to flow in the downstream space 36 </ b> B toward the center side and to flow into the hollow portion 35 of the rotating shaft portion 31. Thus, it is possible to increase the heat exchange rate by configuring the washing water to flow in the entire radial direction in each plate 32.

  As shown in FIG. 3, the pair of side walls 32 </ b> A and 32 </ b> B constituting the plate 32 are recessed and formed in a direction approaching each other at a plurality of locations on the circumference, thereby providing a plurality of recesses 38. The pair of side walls 32 </ b> A and 32 </ b> B are formed so as to sandwich the partition wall 37 from both sides by the recess 38.

  As shown in FIG. 2, the outer container 30 has an elongated rectangular parallelepiped shape that accommodates the inner flow path portion 27 therein, and the axial direction of the inner flow path portion 27 in a pair of side walls 30 </ b> A and 30 </ b> B facing the axial direction X. Both ends of X are rotatably held in a sealed state. The outer container 30 is provided with a waste liquid inlet 45 into which the waste liquid from the main washing tank 3 is introduced on the upper side of the axial end located on the downstream side (right side in FIG. 2) of the inner flow path portion 27. Further, a waste liquid outlet 46 directed to a waste liquid treatment facility (not shown) is provided on the lower side of the axial end located on the upstream side (the left side in FIG. 2) of the inner flow path portion 27. And the waste liquid outlet 46 constitutes the outer flow path 28.

  The outer container 30 is provided with a plurality of partition walls 42 that partition the gaps 40 between the plates 32 of the inner flow path portion 27 in the axial direction X at predetermined intervals. The partition wall 42 terminates before the inner end 42 </ b> A reaches the rotation shaft portion 31 of the inner flow path portion 27, so that the flow channel 44 through which waste liquid flows between the rotation shaft portion 31 and the inner side of the partition wall 42. Thus, the waste liquid is prevented from flowing as it is along the inner wall surface of the outer container 30, and the heat exchange rate with the washing water flowing in the plate 32 is increased.

  The rotating shaft portion 31 of the inner flow passage portion 27 is connected to a motor (not shown) and is configured to rotate within the outer cylinder container 28 by the action of the motor. In this way, the inner flow path portion 27 having the plate 32 is rotated by the rotation of the rotary shaft section 31, whereby the waste water in the outer flow path 28 is agitated, and the waste water is adhered to the surface of the plate 32 by centrifugal force. And the self-cleaning function of the heat exchanger 26 is exhibited. In addition, the waste liquid is agitated in this way, and the washing water inside the agitator is also agitated by the rotation of the plate 32, so that the heat exchange rate can be increased. In particular, the heat exchange rate can be further increased by providing each plate 32 with the plurality of convex portions 38 interspersed. The number of rotations of the inner flow path portion 27 is not particularly limited, but can be, for example, 30 to 90 rotations / minute, and in this embodiment, 60 rotations / minute.

  In the present embodiment configured as described above, a heat exchanger 26 is provided in the middle of the waste water channel 25 discharged from the main washing tank 3, and heat exchange with the washing water supplied to the rinsing tank 13 is performed. Since the temperature of the wastewater can be lowered, the temperature rise of the wastewater treatment facility can be suppressed.

  In addition, since the heat exchanger 26 has a self-cleaning function, the inside of the heat exchanger 26 is not clogged or the heat exchange rate is deteriorated due to main washing water (waste water) containing various organic and inorganic contaminants. On the other hand, heat exchange is possible, the waste water waste heat can be effectively used, and maintainability can be improved. In other words, if there is no self-cleaning function as described above, the waste water of the main washing water will be clogged immediately, and frequent dismantling and cleaning of the heat exchanger will be necessary. Such a problem can be solved by having a self-cleaning function.

  Moreover, in this embodiment, the temperature of the washing water used for rinse water using the waste heat of wastewater can be raised, for example to 30-40 degreeC. Therefore, the temperature of the objects to be washed in the rinsing tanks 10 to 13 can be kept at about 40 ° C., and the objects to be washed before drying can be heated, so that the drying time can be shortened. As a result, the amount of fuel such as heavy oil can be reduced.

  Although the counterflow type continuous washing machine has been described in the above embodiment, the present invention can be similarly applied to a batch flow type continuous washing machine. The batch flow type of the 14 tank type continuous washing machine shown in FIG. 1 will be described. The washing water flows as follows.

  That is, in the batch flow method, water is supplied to the first main washing tank 3 located closest to the pre-washing tank 2 and drained from the last main washing tank 9 located closest to the rinse tank 10 to the waste water channel. Specifically, water from the prewash tank 24 is supplied to the prewash tank 1, sent to the prewash tank 2, and then discharged from the prewash tank 2. Then, in the first main washing tank 3, water is supplied from the rinse water recovery tank 22, and the detergent is also put into the first main washing tank 3. And main wash water sent to main wash tank 3-> main wash tank 4-> main wash tank 5-> main wash tank 6-> main wash tank 7-> main wash tank 8-> main wash tank 9 with a to-be-washed object sequentially. Is discharged into the waste water channel in the main washing tank 9. The rinsing is performed in the same manner as the counter flow method.

  Even in such a batch flow type, the heat exchanger 26 is provided in the middle of the waste water channel discharged from the main washing tank 9, and the waste water is exchanged with the washing water supplied to the rinsing tank 13. Since the temperature can be lowered, an increase in the temperature of the wastewater treatment facility can be suppressed. Moreover, maintainability can be improved because the heat exchanger 26 has a self-cleaning function. Furthermore, the temperature of the washing water used for the rinse water can be raised by utilizing the waste heat of the waste water, and the drying time can be shortened by giving heat to the washing object before drying.

  In addition, in this invention, various textiles are mentioned as a to-be-washed | cleaned item used as washing object, It does not specifically limit. All the laundry which performs commercial laundry can be made into a target wash. The material is not particularly limited, and for example, it is preferable to target polyester or cotton.

  Also, the detergent used is not particularly limited, and various surfactants, alkali agents, bleaching agents and the like generally used in continuous washing machines can be used. In addition, although not enumerated one by one, it can be appropriately changed without departing from the gist of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used in various laundry fields including business laundry such as linen supply industry and cleaning industry.

1, 2 ... Pre-washing tanks 3, 4, 5, 6, 7, 8, 9 ... Main washing tanks 10, 11, 12, 13 ... Rinsing tanks 25 ... Waste water channels 26 ... Heat exchangers 27 ... Inner flow path portions 28 ... Outer channel 30 ... outer container 31 ... rotating shaft 32 ... plate 36 ... hollow part X ... axial direction

Claims (4)

At least one prewash tank (1,2), a plurality of main wash tanks (3,4,5,6,7,8,9) and at least one rinse tank (10,11,12,13); The washing object is washed while moving the washing object from the pre-washing tank to the main washing tank and then to the rinsing tank, and the washing water is supplied to the rinsing tank, and the main washing water is discharged from the main washing tank to the waste water channel. In the continuous washing machine discharged to (25),
A heat exchanger (26) having a self-cleaning function for performing heat exchange using the washing water supplied to the rinsing tank as cooling water and the waste water discharged from the main washing tank as cooling water is provided in the waste water channel. Provided in the middle
A continuous washing machine characterized by that. The heat exchanger (26)
An inner channel portion (27) through which washing water supplied to the rinsing tank flows and an outer channel that surrounds the inner channel portion and through which the waste water flows are formed between the inner channel portion and the inner channel portion. An outer container (30),
A plurality of the inner flow path portions are arranged in parallel in the axial direction of the rotation shaft portion having a rotation shaft portion (31) rotatably provided in the outer container and a hollow portion through which the washing water flows. A plate (32),
With the rotation of the inner flow path portion having the plate, it has a self-cleaning function to prevent the waste water from adhering to the plate surface.
The continuous washing machine according to claim 1. In the plurality of main washing tanks, the main washing water is allowed to flow from the main washing tank (9) located on the rinsing tank side toward the main washing tank (3) located on the prewash tank side, and the main washing water is supplied to the prewash tank side. It is a counter flow type that discharges from the main washing tank located in the waste water channel (25),
The continuous washing machine according to claim 1 or 2, characterized in that At least one prewash tank (1,2), a plurality of main wash tanks (3,4,5,6,7,8,9) and at least one rinse tank (10,11,12,13); The washing object is washed while moving the washing object from the pre-washing tank to the main washing tank and then to the rinsing tank, and the washing water is supplied to the rinsing tank, and the main washing water is discharged from the main washing tank to the waste water channel. In the method of washing using the continuous washing machine discharged to (25),
A heat exchanger (26) having a self-cleaning function is provided in the middle of the waste water channel, and the washing water supplied to the rinse tank is used as cooling water, and the waste water discharged from the main washing tank is used as cooling water. Exchange,
A continuous washing method characterized by that.

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