JP2005245397A - Steam-heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide steam-heating apparatus which keeps the heated material in clean state after heat treatment and also keeps a treating chamber clean, and reduces energy consumption. <P>SOLUTION: The invention relates to the steam-heating apparatus provided with a primary steam boiler 17, a secondary steam boiler 11 which generates steam by indirectly heating softened water without feeding chemicals supplied from a water softener 10 by the steam generated from the primary steam boiler 17, a treating chamber 2 for heat treating the subject to be heated 1 by the steam from the secondary steam boiler 11, a hot water cleaning device 43 to clean the treating chamber 2 by using hot water obtained by mixing the steam from the primary steam boiler 17 with water, and a controller 8 which selectively enables a heating operation and a cleaning operation by the hot water cleaning device 43 in a state stopping the heating of the secondary steam boiler 11 by the primary steam boiler 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a steam heating apparatus such as a thawing apparatus that performs thawing by heating an object to be thawed with steam.

  This type of steam heating apparatus is widely known from Patent Document 1 and the like. In this steam heating device, hygiene management is important. First, it is necessary to maintain the sanitation of the object to be heated, and then it is necessary to maintain the surface of the processing chamber related to the sanitation of the object to be heated in a sanitary manner. In addition to this, it is important to keep the components of the decompression means of the processing chamber in communication with the processing chamber, which are related to hygiene in the processing chamber, difficult to reach, clean.

JP 2002-218960 A

  The main object of the present invention is to keep the heated object after the heat treatment clean and to keep the treated chamber clean, and further to provide a steam heating apparatus capable of realizing energy saving.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is directed to indirect heating of non-chemically supplied water with primary steam boiler and soft water of a water softener by primary steam. A secondary steam boiler that generates secondary steam, a processing chamber that heat-treats an object to be heated by the secondary steam, and a hot water cleaning machine that cleans the processing chamber using hot water obtained by mixing primary steam and water; And a controller that selectively enables the heat treatment operation and the washing operation by the hot water washing machine in a state where the indirect heating is stopped.

  The invention according to claim 2 includes a primary steam boiler, a secondary steam boiler that generates secondary steam by indirectly heating non-chemically supplied water using soft water in a water softener, and the secondary steam. A treatment chamber for heat-treating a heated object, a warm water washing machine for washing the treatment chamber using warm water mixed with primary steam and soft water, and the warm water in a state in which the heating treatment operation and the indirect heating are stopped And a controller that selectively enables a washing operation by the washing machine.

  The invention described in claim 3 includes a primary steam boiler, a secondary steam boiler that generates secondary steam by indirectly heating non-chemically supplied water using soft water of a water softener, and the secondary steam. A treatment chamber for heat-treating a heated object, a warm water washing machine for washing the treatment chamber using warm water obtained by mixing secondary steam and soft water, the heating treatment operation, and a washing operation by the warm water washing machine And a controller capable of selectively enabling.

  Further, the invention according to claim 4 is the invention according to claims 1 to 3, further comprising a pressure reducing means in the processing chamber, wherein the controller stops the indirect heating and the hot water or steam of the pressure reducing means is stopped. The sterilization operation for performing the sterilization by the above is selectively made possible by adding to the heat treatment operation and the washing operation.

According to this invention, the object to be heated is heated with clean steam by the secondary steam boiler, so that the object to be heated can be kept clean, and the treatment chamber is washed with warm water, so compared with steam cleaning. , Dirt can be easily removed, and the processing chamber can be easily kept clean. Furthermore, since the operation of the secondary steam boiler is stopped during the cleaning operation, energy saving can be achieved.

(Embodiment 1)
Next, a first embodiment of the present invention will be described. The first embodiment is implemented in a thawing device or a steaming device that heats an object to be heated with steam.

  First, an outline of the first embodiment will be described. This Embodiment 1 includes a primary steam boiler, a secondary steam boiler that generates secondary steam by indirectly heating non-chemically supplied water with soft water of a water softener with the primary steam of the primary steam boiler, and A processing chamber that heats an object to be heated with secondary steam and performs processing by thawing or steaming, a hot water washer that cleans the processing chamber using hot water obtained by mixing a primary steam boiler and water, and A controller that selectively enables the heat treatment operation and a washing operation by the hot water washing machine in a state where heating (indirect heating) of the secondary steam boiler by the primary steam boiler is stopped. It is the steam heating device characterized.

  According to the first embodiment, during the heat treatment operation, the object to be heated is heated with the clean secondary steam of the secondary steam boiler generated using non-chemically poured soft water, and the hardness and chemicals are A clean heat treatment without adhesion can be performed, and the heated object after the heat treatment can be kept clean. Further, since warm water cleaning is performed during the cleaning operation, dirt attached to the processing chamber can be easily removed, and the processing chamber can be easily kept clean. Furthermore, during the cleaning operation, the secondary steam boiler is shut down and no thermal loss occurs in the secondary steam boiler, so energy saving can be realized.

  Next, components of the first embodiment will be described. First, the primary steam boiler is a boiler such as a small once-through boiler that heats feed water with a burner to generate primary steam, and its type and type are not limited. This primary steam boiler usually allows the use of chemicals such as anticorrosives and oxygen scavengers.

  The said secondary steam boiler is a boiler which produces | generates a secondary steam by indirectly heating with the said primary steam boiler using the soft water by a water softener as feed water. This water supply shall be a non-chemical injection that does not inject chemicals. The structure of this secondary steam boiler is not limited to a specific one, but the portion in contact with the water supply can be made of a material such as stainless steel so that rust does not occur even when there is no chemical injection.

  The processing chamber is an area used for heat treatment of food materials (also referred to as food) such as thawing and steaming, and includes chambers, rooms, containers, and tanks that can store and remove food materials as heated objects. Meaning and can also be referred to as a region or space.

  In this processing chamber, food is heat-treated with steam generated by the secondary steam boiler. The heat treatment includes heat treatment of food materials such as thawing and steaming, and preferably the inside of the treatment chamber is heated to low pressure steam at atmospheric pressure or lower. This food can be referred to as an object to be cooked when the process is steaming, and can be referred to as an object to be thawed when the process is thawing. Here, steaming means steaming or cooking, but in this specification, steaming or cooking is also included in steaming.

  The hot water washing machine is a washing machine that jets hot water generated by mixing steam and water of the primary steam boiler from a nozzle, and is not limited to a specific one in terms of structure, but preferably a gun type Shall be.

  Further, the controller controls to selectively perform the heated object processing operation and the cleaning operation. The heat treatment operation is an operation mode in which an object to be heated is heat treated using the steam of the secondary steam boiler, and the heating of the feed water of the secondary steam boiler is controlled by the steam of the primary steam boiler, Steam with a predetermined pressure (for example, 0.2 hPa: about 2 atm) is generated. The cleaning operation is an operation mode in which steam and water from the primary steam boiler are mixed to supply hot water at a predetermined temperature (for example, about 400 ° C. with no risk of operator burns) to the hot water cleaner. It is. The hot water is ejected from the hot water washer by the opening / closing operation of the operation unit of the operator. During this cleaning operation, heating of the secondary steam boiler by the primary steam boiler is stopped, and no heat loss is caused by using the secondary steam boiler.

  The present invention is not limited to the first embodiment, and includes the following second to fourth embodiments.

(Embodiment 2)
The second embodiment includes a primary steam boiler, a secondary steam boiler that generates steam by indirectly heating non-chemically supplied water with soft water of a water softener by steam of the primary steam boiler, and the secondary steam boiler. A treatment chamber for heat-treating an object to be heated with steam, a hot water washing machine for washing the treatment chamber using warm water obtained by mixing steam of the primary boiler and soft water of the water softener, and the heat treatment The steam heating apparatus includes a controller that selectively enables the operation and the cleaning operation by the hot water washer while the heating to the secondary steam boiler by the primary steam boiler is stopped.

  The difference between the second embodiment and the first embodiment is that, during the cleaning operation, the steam of the primary steam boiler and the soft water from the water softener are mixed to generate hot water, and the hot water is washed. is there.

  According to the second embodiment, in addition to the functions and effects of the first embodiment, the cleaning is performed with warm water containing a large amount of soft water, so that the cleaning effect when using a detergent is improved, and the processing chamber is cleaned. The effect can be improved.

(Embodiment 3)
The third embodiment includes a primary steam boiler, a secondary steam boiler that generates steam by indirectly heating non-chemically supplied water with soft water of a water softener by steam of the primary steam boiler, and the secondary steam boiler. A treatment chamber for heat-treating an object to be heated with steam, a warm water washing machine for washing the treatment chamber using warm water obtained by mixing steam of the secondary steam boiler and soft water of the water softener, and The steam heating apparatus includes a controller that selectively enables a heat treatment operation and a cleaning operation by the hot water washer.

  The difference between the third embodiment and the second embodiment is that, during the washing operation, the steam of the secondary steam boiler and the soft water of the water softener are mixed to generate hot water, and the hot water is washed. is there.

  According to the third embodiment, as compared with the first embodiment, since it is washed with warm water containing only soft water, in addition to the effect of the second embodiment, iron rust and the like are not mixed, and cleanliness is achieved. The heat treatment can be performed with simple steam. On the other hand, since the secondary steam boiler is operated during the cleaning operation, the energy saving effect is low as compared with the first embodiment.

(Embodiment 4)
This Embodiment 4 is the state which provided the pressure reduction means in the said process chamber in the said Embodiment 1-Embodiment 3, and the said controller stopped the heating to the said secondary steam boiler by the said primary steam boiler The steam heating apparatus is characterized in that a sterilization operation for performing sterilization with warm water or steam of the decompression means in step 1 can be selectively performed in addition to the heated object treatment operation and the cleaning operation.

  In the fourth embodiment, the decompression means is added to the constituent elements of the first to third embodiments. The decompression means includes, as its constituent elements, a pipe line (decompression path) connected to the processing chamber and a decompressor provided in the decompression path. The decompressor is not limited to a specific one, but is preferably a combination of a steam ejector, a heat exchanger for condensing steam, and a vacuum pump.

  Further, the fourth embodiment has sterilizing means for sterilizing a part of the decompression means. The sterilization unit is configured to heat sterilize the decompression unit by directly introducing the steam of the primary steam boiler or the hot water generated by mixing the steam and water to the decompression unit without passing through the processing chamber. Can be configured. However, preferably, a part of the pressure reducing means is indirectly sterilized by heat from the steam or hot water of the primary steam boiler from the outside. Such indirect heating can prevent the temperature of the processing chamber wall from becoming high due to high-temperature steam entering the processing chamber, and can eliminate the risk of burns.

  Further, when the decompressor is a combination of a steam ejector, a heat exchanger, and a vacuum pump, the target of indirect heating is preferably a steam ejector, and more preferably, after the steam ejector is indirectly heated. Steam or hot condensed water can be directed to the heat exchanger to sterilize the heat exchanger.

  The controller can selectively execute the preheat treatment operation, the cleaning operation, and the sterilization operation by the sterilization means. The sterilization operation is preferably configured to be automatically executed for a predetermined time when this operation mode is selected and the start switch is operated.

  According to the fourth embodiment, not only the processing chamber but also the decompression means can be sterilized, and the entire apparatus can be kept clean.

  Hereinafter, specific examples of the decompression apparatus embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a schematic configuration of the embodiment, FIG. 2 is an explanation of a main part of the embodiment, and FIG. 3 is a flowchart showing an outline of a control procedure of the embodiment.

  The thawing device of this embodiment is applied to a business thawing device. This thawing apparatus includes a thawing chamber 2 as a processing chamber for storing a material to be thawed 1 as an object to be processed, steam supply (steaming) means 3 for supplying steam into the thawing chamber 2, and the thawing chamber 2. A decompression means 4 for sucking and exhausting the interior and maintaining a low pressure, a decompression means 5 for restoring pressure by introducing outside air into the decompressed thawing chamber 2, and an object 1 to be thawed are placed on the thawing chamber 2. A trolley (transportation vehicle) 6 that can be freely inserted and removed, a pressure detector 7 that detects the pressure in the thawing chamber 2, and a control procedure in which a signal from the pressure detector 7 is input and stored in a memory. A controller 8 that controls the thawing of the object 1 to be dissolved by the low-pressure steam therein is provided as a main part.

  The to-be-thawed material is meat or the like that is vacuum-packed, and includes those that are not vacuum-packed. The object to be thawed that has been vacuum packaged is desirably formed with a cut hole or a ventilation hole (not shown) formed of a hole in the package with a blade or the like before thawing. By forming such vents, it is possible to prevent the heat transfer from being hindered due to the expansion of the package when the low-pressure steam is thawed, and it is possible to shorten the thawing time by directly contacting the food with the steam.

  The thawing chamber 2 includes a door (not shown) for taking in and out the material 1 to be thawed, and is configured so that the cart 6 can be easily taken in and out by forming a lower floor surface. In this embodiment, thawing with low-pressure steam is performed and the inside of the thawing chamber 2 is not set to atmospheric pressure or higher, so that it is not formed as a pressure-resistant pressure vessel. However, in the case of providing the function of steam heating of food with high-pressure steam, a pressure-resistant pressure vessel can be obtained.

  The steam supply means 3 includes a first steam supply path 9 for connecting one end to the thawing chamber 2 and supplying clean steam into the thawing chamber 2. 10, a secondary steam boiler 11 as a steam generation source that generates clean steam using soft water supplied from the water softener 10, a first steam supply valve 12 that controls the supply of steam, and the thawing chamber 2 And a steam outlet 13 for ejecting steam into the inside. The first steam supply valve 12 uses a valve such as a proportional valve capable of adjusting the steam supply amount by adjusting the opening.

  The water softener 10 is a device for softening raw water supplied from the raw water supply passage 14 by ion exchange, and a first drainage passage for draining (blowing) water stored in an internal resin cylinder (not shown). 15 is provided. The discharge passage 15 is provided with a first drain valve 16.

  The secondary steam boiler 11 is a secondary steam boiler (which may be referred to as a reboiler) that uses the primary steam boiler 17 as an indirect heating source, and is connected to the primary steam boiler 17 by a second steam supply path 18. Yes. The second steam supply path 18 includes a second steam supply valve 19. Further, the secondary steam boiler 11 is provided with a second drainage channel 21 for discharging (blowing) can water, and the second drainage channel 21 is provided with a second drainage valve 22. Between the water softener 10 and the secondary steam boiler 11, a soft water tank, a water supply pump, and a soft water supply valve (all not shown) are provided in this order from the upstream side.

  The secondary steam boiler 11 is made of stainless steel and uses the soft water of the water softener 10 and is non-chemically poured. Thereby, since the supply steam to the thawing chamber 2 does not contain chemicals or iron, thawing by safe low-pressure steam is realized.

  The decompression means 4 is for decompressing the inside of the thawing chamber 2 and includes a decompression path 23 and a decompressor provided in the decompression path 23. The decompressor includes a steam ejector 24, a heat exchanger 25, and a water-sealed vacuum pump 26. Further, the decompression path 23 is provided with a check valve 27 for preventing the flow toward the thawing chamber 2.

  The steam ejector 24 is connected to a third steam supply path 28 for supplying steam from the primary steam boiler 17, and the third steam supply path 28 is provided with a third steam supply valve 29. Further, as will be described in detail later, this steam ejector 24 is formed with a heat exchange part 32 for sterilization outside the ejector part 31. A fourth steam supply path 33 that supplies steam from the primary boiler 17 is connected to the heat exchange section 32, and the fourth steam supply path 33 includes a fourth steam supply valve 34.

  The heat exchanger 25 has a function of condensing steam, and is a shell-and-tube heat exchanger. The inside of the tube 25b is connected to the decompression path 23, the first water supply path 35 for supplying cooling water is connected to the shell 25a, and the first water supply path 35 is provided with a first water supply valve 36.

  The outlet of the fourth steam supply passage 33 is connected between the heat exchanger 25 and the first water supply valve 36 of the first water supply passage 35, and steam or high temperature discharged from the heat exchange section 32. The condensed water is introduced into the shell 25a, and the tube 25b of the heat exchanger 25 is indirectly heated.

  Further, the return pressure means 5 includes a return pressure path 37 as an outside air introduction path with one end connected to the thawing chamber 2. The return pressure passage 37 includes a return pressure valve 38 for controlling the introduction of outside air and a filter 39 for sterilization. The return pressure valve 38 uses a proportional valve such as a motor valve capable of adjusting the amount of introduced air by adjusting the opening degree.

  The cart 6 includes a plurality of stages of shelves 41, 41,... On which the object 1 to be thawed is placed, and a tray 42 as a storage means for receiving and storing the condensed water flowing down from each of the shelves 41.

  Further, a hot water washing machine 43 for washing the inner surface of the thawing chamber 2 is provided in the vicinity of the front opening through which the cart 6 is taken in and out of the thawing chamber 2. A mixer 44 that mixes steam and water is connected to the hot water washer 43. A fifth steam supply path 45 that supplies steam from the primary steam boiler 17 and a second steam supply path 45 are connected to the mixer 44. A water supply path 46 is connected, and in the mixer 44, steam and water are mixed, and hot water for cleaning at about 40 ° C. is supplied to the hot water cleaner 43. The fifth steam supply passage 45 and the second water supply passage 46 are respectively provided with a fifth steam supply valve 47 and a second water supply valve 48. The warm water washer 43 employs a well-known gun type.

  Here, the structure of the sterilization by the heat exchange part 32 of the steam ejector 24 which is a component of the decompression means 4 will be described in detail. Referring to FIG. 2, in the steam ejector 24, a second outer wall 51 of the heat exchanging portion 32 is formed as shown so as to surround the first outer wall 50 of the ejector portion (jacket forming portion) 31. A steam flow path is formed between the one outer wall 50 and the second outer wall 51. 52 and 53 are a steam inlet and a steam outlet, respectively. Reference numeral 54 denotes a steam injection unit. When the steam from the third steam supply path 28 is ejected in the steam injection section 54, air and steam in the thawing chamber 2 are sucked and exhausted through the decompression path 23 by the ejector effect. 55 are mounting flanges, 56, 56,... Are packings, and 57 is a lid that closes the opening.

  The controller 8 receives a signal from the pressure detector 7, and according to a predetermined processing procedure (program), the steam supply valves 12, 19, 29, 34, 47, the vacuum pump 26, and the water supplies. The valves 36 and 48, the return pressure valve 38, the soft water supply valve, the water supply pump, and the like are controlled.

  In this embodiment, the treatment procedure selects a heat treatment operation (thawing operation) for heat-treating the object 1 to be thawed with steam, a washing operation by the hot water washing machine 43, and a sterilization operation of the ejector 31. The procedure to make it executable is included. An outline of this processing procedure is shown in FIG.

  The operation of this embodiment will be described below with reference to FIGS. First, referring to FIG. 3, when an operation switch (not shown) of the apparatus is turned on, a standby state is set at processing step S1 (hereinafter, processing step SN is simply referred to as S1), and an operation mode selection switch (not shown). ) Wait for the operation.

  If the thawing operation mode is selected, the process proceeds to S2 and the thawing operation is performed. In this thawing operation, the controller 8 is performed after the air evacuation step for evacuating the air in the thawing chamber 2 and after this air evacuation step, and the detected pressure by the pressure detector 7 in the thawing chamber 2. The thawing step of thawing the material 1 to be thawed is performed by controlling the steam supply means 3 and the decompression means 4 so that the value becomes the set value. In this thawing step, the decompression means 4 is operated, and the opening degree of the first steam supply valve 12 is adjusted, and saturated steam is continuously supplied into the thawing chamber 2 from the steam outlet 13. However, the method includes a step of performing thawing while keeping the inside of the thawing chamber 2 at a predetermined low pressure below atmospheric pressure.

  When the steam supply means 3 is in operation, the controller 8 can open the second steam supply valve 19 and put the secondary steam boiler 11 in an operating state with reference to FIG. To make sure And the said controller 8 adjusts the opening degree of said 1st steam supply valve 12, and it controls so that the detection pressure by the said pressure detector 7 becomes a setting value. The supply control of the soft water to the secondary steam boiler 11 is performed by controlling the feed water pump and the soft water supply valve by a detection signal from a water level controller (not shown). The primary steam boiler 17 is controlled to generate steam at a predetermined pressure by its own controller (not shown).

  In S5, when the set thawing time elapses, it is determined that the thawing end condition is satisfied, the thawing operation is terminated, and the process proceeds to S1 and enters a standby state.

  When the cleaning operation mode is selected in S1, the process proceeds to S3 and the cleaning operation is performed. During this cleaning operation, the controller 8 closes the second steam supply valve 19 and puts the secondary steam boiler 11 into an operation stop state. Then, the fifth steam supply valve 47 and the second water supply valve 48 are opened for a predetermined time. The reason for opening for a predetermined time is to limit the amount of jetting when the hose connected to the tip of the hot water washer 43 is damaged, and to prevent the backflow of steam to the water supply side.

  Thereby, the door of the thawing chamber 2 is opened, the operation part (not shown) of the hot water washer 43 is operated, hot water is jetted from the nozzle (not shown), and the hot water cleaning in the thawing chamber 2 is performed. It can be performed. By providing such a hot water cleaning configuration, the wall surface in the thawing chamber 2 and the inner surface of the door can be kept clean. During the cleaning operation, the heating of the secondary steam boiler 11 by the primary steam boiler 17 is stopped, so that it is possible to prevent thermal loss in the secondary steam boiler 11 and to perform an energy saving operation.

  This cleaning operation is ended when the operation of the switch (not shown) at the end of the cleaning operation or any condition after the elapse of a predetermined time is satisfied in S6 and returns to S1.

  Next, when the sterilization operation mode is selected in S1, the process proceeds to S4, and the sterilization operation of the steam ejector 24 and the heat exchanger 25 is performed. At the time of this sterilization operation, the controller 8 closes the second steam supply valve 19 and puts the secondary steam boiler 11 into an operation stop state. And the said controller 8 opens the said 4th steam supply valve 34, and supplies the high temperature (100 degreeC or more) vapor | steam to the said heat exchange part 32. FIG. At this time, since the thawing operation is stopped, the third steam supply valve 29 and the first water supply valve 36 are closed.

  As a result, the ejector unit 31 is indirectly heated by the steam flowing through the heat exchange unit 32 and the temperature thereof rises. Thereby, various germs can be killed in the steam ejector 24 or their growth can be suppressed. Thus, the steam ejector 24 that is out of reach can be kept hygienic.

  Further, the steam or hot water exiting the heat exchanging section 32 is guided into the shell 25a of the heat exchanger 25, and the tube 25b of the heat exchanger 25 is indirectly heated, so that the sterilization in the tube 25b is performed. Done.

  During the steam sterilization, the steam does not flow into the thawing chamber 2 and the heat conduction from the steam ejector 24 has a large thermal resistance due to the packing 56 of the mounting flange of the steam ejector 24 or the like. It is not performed, and the wall surface temperature of the thawing chamber 2 does not increase, and it is safe.

Even during the sterilization operation, the heating of the secondary steam boiler 11 by the primary steam boiler 17 is stopped, so that the occurrence of thermal loss in the secondary steam boiler 11 can be prevented, and an energy saving operation can be performed.

  In S7, when it is determined that the set time of the sterilization operation has elapsed or the operation of the sterilization operation stop switch (not shown) is determined, the sterilization operation is terminated, and the process returns to S1 and enters a standby state.

  In this embodiment, the following configuration can be added. When the opening and closing of the warm water washer 43 and the return pressure valve 38 are linked, that is, when the warm water washer 43 is operated, the return pressure valve 38 is closed. With this configuration, it is possible to prevent the filter 39 from getting wet or dirty during hot water cleaning. Further, the opening and closing of the door and the return pressure valve 38 can be interlocked so that the return pressure valve 38 is closed when the door is opened. By adopting this configuration, when the inside of the thawing chamber 2 is washed by the hot water washer 43, the return pressure valve 38 is opened in conjunction with the opening of the door, so that the hot water washer 43 is placed in the return pressure path 37. Even if the hot water washer 43 is operated, it is possible to prevent water from entering the filter 39 or the accumulation of liquid in the piping in the return pressure passage 37. Here, a valve different from the return pressure valve 38 is provided in the return pressure passage 37, and the same action can be performed by this valve.

  Also, the front door of the thawing chamber 2 is a left-right slide type, and the hot water washer 43 is provided on the left and right in the vicinity of the front opening of the thawing chamber 2 (one washer is provided with a hot water supply port not shown). Including a structure provided on the left and right and attached to and detached from the left and right hot water supply ports). By adopting such a configuration, the inside of the thawing chamber 2 is cleaned using a cleaning machine (cleaning gun) on the side where the door does not move when the door is released, and the cleaning of the inner surface of the door is performed on the other side Can be done by machine.

  Before starting water supply from the water softener 10 to the secondary steam boiler 11, the first drain valve 16 is opened so that the water in the water softener 10 is drained through the first drainage channel 15. Can be configured. By adopting this configuration, when the operation is stopped for a long time, it is possible to prevent water staying in the water softener 10 from being mixed for a long time in the steam supplied to the thawing chamber 2. Further, when the primary pressure or the secondary pressure of the secondary steam boiler 11 is insufficient, the first steam supply valve 12 can be configured not to open. By adopting this configuration, the canned water of the secondary steam boiler 11 is prevented from being sucked into the thawing chamber 2 by evacuating the secondary steam boiler 11 without pressure. be able to. Furthermore, the second drain valve 22 is opened every time after thawing is completed, and the can water of the secondary steam boiler 11 can be drained through the second drain passage 21. By adopting this configuration, since the concentration of can water is prevented, continuous (or intermittent) blow (drainage) during operation can be eliminated.

  The present invention is not limited to the above embodiment. That is, it can be applied to a device such as a steaming cooler that heats an object to be heated using steam other than the thawing device.

It is explanatory drawing which shows schematic structure of the Example of this invention. It is explanatory drawing of the principal part of the Example. It is a flowchart figure explaining the control procedure of the Example.

Explanation of symbols

2 Thawing room (processing room)
4 Depressurization means 32 Heat exchange part 43 Hot water washer

Claims (4)

  A primary steam boiler 17, a secondary steam boiler 11 that generates secondary steam by indirectly heating non-chemically supplied water using soft water from the water softener 10 with the primary steam, and the object 1 to be heated by the secondary steam The hot water washing machine 43 in the state which stopped the said heat processing operation and the said indirect heating, the hot water washing machine 43 which wash | cleans the inside of the said processing chamber 2 using the warm water which mixed primary steam and water A steam heating apparatus comprising a controller 8 that selectively enables a cleaning operation by the machine 43.   A primary steam boiler 17, a secondary steam boiler 11 that generates secondary steam by indirectly heating the non-chemically supplied water with soft water from the water softener 10 with the primary steam, and the object 1 to be heated by the secondary steam A treatment chamber 2 to be treated, a warm water washing machine 43 for washing the inside of the treatment chamber 2 using warm water in which primary steam and soft water are mixed, and the warm water in a state where the heat treatment operation and the indirect heating are stopped. A steam heating apparatus comprising a controller 8 that selectively enables a cleaning operation by the cleaning machine 43.   A primary steam boiler 17, a secondary steam boiler 11 that generates secondary steam by indirectly heating non-chemically supplied water using soft water from the water softener 10 with the primary steam, and the object 1 to be heated by the secondary steam A treatment chamber 2 to be used, a warm water washing machine 43 for washing the inside of the treatment chamber 2 using warm water obtained by mixing secondary steam and soft water, a heating treatment operation, and a washing operation by the warm water washing machine 43 are selected. A steam heating device characterized by comprising a controller 8 that can be activated automatically.   A sterilization operation in which the pressure reduction means 4 in the processing chamber 2 is provided and the controller 8 sterilizes the pressure reduction means 4 with hot water or steam in a state where the indirect heating is stopped is referred to as the heat treatment operation and the cleaning. The steam heating apparatus according to any one of claims 1 to 3, wherein the steam heating apparatus is selectively enabled in addition to the operation.

Images