JP6181927B2 - Steam humidifier and drainage control method thereof - Google Patents

Description

  The present invention relates to a steam humidifier that generates steam by heating water stored in a tank and a method for controlling the drainage thereof.

  2. Description of the Related Art Conventionally, humidifiers are known that generate steam used for humidification in a room or the like by heating water stored in a tank. In such a steam humidifier, water evaporates with operation, and the water level in the heating tank gradually decreases. Therefore, a water supply tank is provided to detect water level drop and replenish water. Since this water supply tank maintains a constant water level in the heating tank, steam can be continuously generated in the heating tank.

  However, although water evaporates in the heating tank, impurities such as calcium contained in the water do not evaporate. Therefore, impurities contained in the water in the heating tank are concentrated and so-called scale is deposited. The deposited scale adheres to the inner wall of the heating tank and the heating source, and causes a reduction in humidification performance and failure of the humidifier itself. Therefore, such a steam humidifier is equipped with a drainage function for periodically discharging the water in the heating tank in order to keep the impurity concentration of the water in the heating tank below a certain level (see Patent Document 1). ).

JP 2001-141269 A

  By the way, when drainage is performed and the amount of water in the heating tank decreases, water is supplied from the water supply tank to the heating tank. Normally, the temperature of the water in the water supply tank is lower than that of the water in the heating tank, so replenishing the water from the water supply tank cools the water in the heating tank and temporarily reduces the amount of steam generated in the heating tank. . Thereby, whenever the waste water treatment is performed from the heating tank, the humidity of the air-conditioned room is temporarily reduced.

  In clean rooms and factories where high-precision humidity control is required, for example, a humidity controller that combines a humidity sensor and an indicating controller is often used to control the amount of steam generated by the humidifier. In this case, since the heat generation amount of the heating source of the steam humidifier is controlled according to the humidification amount required by the air-conditioned room, when the indoor humidification amount is low, the heat generation of the heating source is performed. The amount also decreases proportionally. When a large amount of water is discharged from the heating tank for scale removal when the heat generation amount of such a heating source is low, compared with the case where the amount of humidification is large and the heat generation amount is high, cold water supplemented from the water supply tank is used. The time until the water in the heating tank reaches a temperature at which steam is generated becomes longer. As a result, the amount of time during which the amount of steam supplied to the room is decreasing increases, and during that period, the room humidity cannot be maintained at a required value.

  The present invention has been made in view of such circumstances. Even when the amount of humidification is low and the heat generation amount of the heating source is low, even if the waste water treatment in the heating tank is performed, the humidity reduction time of the air-conditioning target is minimized. It is an object of the present invention to provide a steam humidifier and a drainage control method for the steam humidifier that can be suppressed to low.

In order to solve the above problems, the steam humidifier of the present invention is characterized by having the following configuration.
(A) A heating tank that has a heating source for heating the water stored inside, and that sends steam generated by the heating source to a space to be air-conditioned
(b) Water supply tank for supplying water into the heating tank
(c) in response to said humidification amount to the space to be air-conditioned, the heating control unit for the heating source to control the amount of heat generated
(d) Drainage device for periodically discharging water from the heating tank
(e) the drainage amount by the drainage device, the drainage control unit which controls to increase or decrease depending on the heating value of the heating source
And
(f) The drainage control unit
(f-1) a storage unit for storing a minimum amount of drainage per drainage of the drainage device;
(f-2) a determination unit that determines whether or not the amount of discharged water per time calculated according to the heat generation amount of the heating source exceeds a minimum amount of discharged water,
(f-3) When it is determined by the determination unit that the amount of discharged water per time exceeds the minimum amount of discharged water, the amount of discharged water per time is set as the heat generation amount of the heating source with a constant water discharge cycle. Increase or decrease accordingly
(f-4) If the determination unit determines that the amount of discharged water per time is less than or equal to the minimum amount of discharged water, the amount of discharged water per time is made constant at the minimum amount of discharged water, and the discharge cycle is the heat generated by the heating source. Increase or decrease according to the amount.

  The drainage control unit includes a required humidity storage unit that stores a required humidity having a predetermined allowable range for the air-conditioning target space, and periodically drains water so that the humidity of the air-conditioning target space falls within the allowable range. You may make it control.

  The heating tank and the water supply tank are communicated with each other by a supplementary water pipe, and at least one of the water supply tank and the supplementary water pipe may be provided with preheating means for preheating water to be supplemented from the water supply tank to the heating tank.

  A steam humidifier drainage control method having these characteristics is also an embodiment of the present invention.

  According to the present invention, even when the waste water treatment in the heating tank is performed when the humidification amount is low, the time during which the humidity of the air-conditioning target space decreases can be minimized. As a result, it is possible to realize highly accurate humidity control that does not deviate significantly from the required range while draining regularly for scale removal.

It is a mimetic diagram showing a schematic structure of a steam humidifier concerning a 1st embodiment. It is a block diagram which shows the structure of the control part which concerns on 1st Embodiment. It is a flowchart which shows the waste_water | drain process which concerns on 1st Embodiment. It is a figure for demonstrating the effect | action of the waste_water | drain process in 1st Embodiment. It is a block diagram which shows the structure of the control part which concerns on 2nd Embodiment. It is a figure for demonstrating the effect | action of the waste water treatment in 2nd Embodiment. It is a block diagram which shows the structure of the control part which concerns on 3rd Embodiment. It is a flowchart which shows the waste_water | drain process which concerns on 3rd Embodiment. The figure which shows the relationship between the amount of waste_water | drain with respect to the emitted heat amount, and a waste_water | drain cycle in the waste water treatment of 3rd Embodiment. It is a schematic diagram which shows schematic structure of the steam humidifier which provided the preheating part in the makeup water pipe.

Hereinafter, a steam humidifier according to the present invention will be described in detail with reference to the drawings.
(First embodiment)
(1) Configuration As shown in FIG. 1, a steam humidifier 1 according to this embodiment includes a heating tank 2, a water supply tank 3, a makeup water pipe 11, a pressure equalizing pipe 12, a drain pipe 13, and a control unit 5. Yes.

  The heating tank 2 is a substantially cylindrical container that stores water therein. The heating tank 2 is provided with a heating source 21 for heating water in the tank. Thermal energy is supplied from the heating source 21 to the water, and vapor is generated in the tank as the water vaporizes. On the ceiling surface of the heating tank 2, a steam hole 22 for releasing steam generated in the tank to the outside of the heating tank 2, and a hose 23 for introducing this steam into a room to be air-conditioned or other air-conditioning equipment. Is provided.

  A drain pipe 13 for discharging water stored in the heating tank 2 to the outside of the tank is provided at the lower part of the heating tank 2. The drain pipe 13 is provided with an on-off valve 4 that regulates drainage. The shape of the heating tank 2 is not limited to a cylindrical shape, and any shape may be used as long as water can be stored and the heating source 21 can be disposed.

  The heating source 21 includes a heating body 21a and a heat amount adjusting unit 21b that adjusts the heating output thereof. The heating body 21a and the calorie adjusting part 21b may be integrated as shown in FIG. 1 or may be provided separately. The calorific value adjustment unit 21 b is connected to the control unit 5 arranged outside the heating tank 2. The heating body 21 a is disposed in the water in the heating tank 2. As the heating source 21, for example, a sheathed heater, a heating coil, an electrode rod that directly heats water by supplying electric power, or the like can be used.

  The water supply tank 3 is a container for storing water to be supplied to the heating tank 2. The water supply tank 3 and the heating tank 2 communicate with each other through two systems of a replenishment water pipe 11 and a pressure equalizing pipe 12. One end of the makeup water pipe 11 is connected to the bottom surface of the water supply tank 3 and the other end is connected to the side surface of the heating tank 2 so that water can flow into the heating tank 2 from the water supply tank 3. The pressure equalizing pipe 12 has one end connected to the ceiling surface of the water supply tank 3 and the other end connected to the upper side of the heating tank 2. By this pressure equalizing pipe 12, the air pressure in the heating tank 2 and the water supply tank 3 is evenly distributed, and the water levels in both tanks become equal.

  An automatic water tap 31 is provided inside the water supply tank 3 to regulate the amount of water supplied from the outside so as to keep the water level in the water supply tank 3 constant. The automatic water tap 31 is, for example, a ball tap water supply type water tap in which the opening degree of the valve is adjusted in conjunction with the operation of the float that moves up and down according to the water level. When the water level of the heating tank 2 decreases, the water supply tank 3 causes the water to flow into the heating tank 2 via the makeup water pipe 11 so that the water levels of both tanks coincide with each other, and the water level decreases. The automatic water tap 31 detects this water level drop and takes in water from the outside so as to return the water level in the water supply tank 3 to a predetermined water level. In this way, the water supply tank 3 is maintained at a constant water level in the heating tank 2.

  One end of the drain pipe 13 is connected to the lower part of the heating tank 2, and the other end is drawn out to the outside of the steam humidifier 1. The drain pipe 13 is provided with a drain valve 4 that regulates the discharge of water in the heating tank 2. The drain valve 4 is opened / closed or adjusted by the controller 5. For example, an electromagnetic valve can be used as the drain valve 4. These water pipe 13 and drain valve 4 correspond to the drainage device in the present invention.

  The command section 9 generates or holds a steam generation amount generated by the steam humidifier 1, that is, a command value S that specifies the humidification amount. The command unit 9 is, for example, a humidity adjuster including a humidity detection unit and a target humidity setting unit. Based on the detected humidity and the set target humidity, the command unit 9 determines the amount of steam necessary for the space to be air-conditioned and outputs a command value S corresponding to the determined amount of steam. Based on the command value S, the control unit 5 controls the heating control of the heating source 21 and the waste water treatment for discharging a part of the water from the heating tank 2.

  The command value S may be a value that specifically designates the humidity of the air-conditioned room by a numerical value such as%, or a target humidity that is designated in stages, such as “high, medium, low” or a number. But it ’s okay. Furthermore, even if the amount of steam generated is directly specified, the amount of heat generated by the heating source 21 of the steam humidifier 1 is specified stepwise or directly, or the amount of electric power such as a sheathed heater is directly specified. good.

  In the present embodiment, the command unit 9 uses a humidity adjuster provided outside the steam humidifier 1, but is not limited to such a mode. For example, the control unit 9 is connected to the steam humidifier 1. 5 may be provided separately or in the control unit 5. The steam generation amount for each time zone may be stored in advance, and the command value S may be output according to the time.

  The detailed configuration of the control unit 5 will be described with reference to the block diagram of FIG. The control unit 5 includes a heating control unit 6 and a drainage control unit 7. The heating control unit 6 and the drainage control unit 7 are constituted by, for example, a dedicated electronic circuit or a microcomputer that operates with a predetermined program.

  The heating control unit 6 is a processing unit that operates the amount of heat generated by the heating source 21 according to the required amount of humidification. In this embodiment, the calorific value Q of the heating source 21 is obtained from the command value S, and the calorific value adjustment unit 21b outputs a control command to the heating element 21a so that the calorific value of the heating element 21a becomes the value Q. . The obtained calorific value Q is input from the heating control unit 6 to the drainage control unit 7.

  The control command output to the heating body 21a by the heat quantity adjusting unit 21b varies depending on the heating source 21 used. For example, when the heating source 21 is a sheathed heater, it is the amount of current or electric power, and when the heating source 21 is a heating coil or the like, it is the amount of steam supplied to the coil.

  The drainage control unit 7 controls drainage from the heating tank 2 according to the calorific value Q of the heating source 21. The drainage control unit 7 includes a drainage amount determination unit 71, a drainage device operation unit 73, a timer unit 74, and a storage unit 75.

  The drainage amount determination unit 71 determines the drainage amount per time in each drainage cycle according to the calorific value Q input from the heating control unit 6. The amount of drainage is configured to increase or decrease according to the amount of heat generation Q. For example, when the drainage amount in the calorific value Qa is Ha, the drainage amount Hb in the case of the calorific value Qb smaller than the value Qa is made smaller than Ha. On the contrary, the drainage amount Hc in the case of the calorific value Qc larger than the value Qa is made larger than Ha. The drainage amount determination unit 71 outputs the determined drainage amount to the drainage device operation unit 73.

  The drainage cycle is determined by the design of the steam humidifier or by the user based on specifications such as the size of the heating tank 2, the target humidity required for the air-conditioning space, and the estimated drainage volume. The data is stored in the storage unit 75. By making the drainage cycle as short as possible and performing regular drainage frequently, it is possible to reduce the amount of drainage at one time. However, if the drainage cycle is made too short, the frequency of water replenishment will increase, and the inside of the heating tank will be cold during that time. Therefore, it is difficult to generate steam, so an appropriate cycle is determined in consideration of the concentration of impurities such as scale accumulated in the tank.

  The drainage device operation unit 73 refers to the timer unit 74 according to the drainage amount input from the drainage amount determination unit 71 and the drainage cycle input from the storage unit 75, and the opening / closing timing of the drainage valve 4 provided in the drainage pipe 13. Adjust the opening time.

(2) Operation Next, the operation of the present embodiment having the above-described configuration will be described in detail with reference to FIGS. FIG. 3 is a flowchart of the waste water treatment according to the present embodiment.

  First, a command value S indicating a steam generation amount necessary for setting the indoor humidity to a desired value is input from the command unit 9 to the heating control unit 6 (step 01). The heating control unit 6 obtains the calorific value Q of the heating source 21 necessary to satisfy the input command value S (step 02). Next, the heating control unit 6 operates the heat amount adjustment unit 21b to set the heat generation amount of the heating body 21a to a value Q (step 03), and the calculated heat generation amount Q to the drainage amount determination unit 71 of the drainage control unit 7. To notify.

  Through these steps 01 to 03, the heating source 21 generates heat with the value Q, and an amount of steam corresponding to the command value S is generated from the heating tank 2. By supplying this steam into the room to be humidified, the room can be air-conditioned at a humidity corresponding to the command value S.

  Next, the drainage amount determination unit 71 determines the drainage amount for each period based on the calorific value Q input from the heating control unit 6 (step 04). The amount of drainage is determined so as to increase if the calorific value Q is large and decrease if the calorific value Q is small. This drainage amount is input from the drainage amount determination unit 71 to the drainage device operation unit 73.

  The determination of the drainage amount by the drainage amount determination unit 71 is not limited to a proportional relationship, and the calorific value Q and the drainage amount may be in an increase function relationship. The temperature rise of the water in the heating tank 2 does not depend only on the calorific value Q, but also depends on the configuration, material, surrounding environment, etc. of the heating tank 2, and therefore, with respect to the calorific value Q Determine the amount of drainage.

  Heating is performed by opening and closing the drain valve 4 while the drainage device operation unit 73 performs time management using the timer unit 74 according to the drainage amount input from the drainage amount determination unit 71 and the drainage cycle input from the storage unit 75. Water is discharged from the tank 2 through the drain pipe 13 (step 05).

  With reference to FIG. 4, a description will be given of a change in indoor humidity when the heat generation amount Q of the heating source 21 changes from “large” to “small”. In FIG. 4, the steam humidifier 1 performs periodic drainage treatment while performing a humidifying operation so that the room humidity to be humidified is constant at the required humidity W. FIG. 4 is a conceptual diagram for explaining the amount of heat generation, the amount of drainage for each cycle, and the change in humidity in the target room.

  (A) has shown the humidity change in the humidification object room | chamber when waste_water | drain processing is performed as the waste_water | drain amount L of the period T and every period when the emitted-heat amount Q is large. The time until the room humidity drops to the lowering point A and recovers to the required humidity W is B for each waste water treatment. For the period C until the next waste water treatment, the indoor humidity is maintained at the required humidity W.

  (B) and (c) show changes in humidity when the calorific value Q is small compared to (a). (B) is a case where waste water treatment is performed by the waste water control method of the present embodiment, and the amount of waste water per period is reduced to L ′ as the calorific value Q decreases. Thereby, the replenishment amount of the water from the water supply tank 3 after draining to the heating tank 2 decreases. As a result, the decrease in the water temperature of the heating tank 2 is suppressed, and the descent point A 'of the indoor humidity becomes higher than A when the calorific value Q is large. Therefore, even if the heat generation amount of the heating source 21 is reduced, the recovery time B ′ from the descending point A ′ is almost the same as (a), and the period C ′ until the next waste water treatment is also (a). And almost the same. That is, the waste water treatment can be performed without being affected by the decrease in the calorific value Q.

  On the other hand, (c) shows a case where the drainage cycle and the drainage amount are made constant with respect to the fluctuation of the calorific value Q without using the drainage control method of the present embodiment. In this case, since the amount of drainage is L, the descending point A ″ is A as in (a), and the heat generation amount of the heating source 21 is decreased corresponding to the decrease in the heat generation amount Q. B ″ becomes longer than the recovery time B of (a). Further, since the recovery time is extended, the period C ″ until the next waste water treatment is shortened. That is, the humidity accuracy is deteriorated due to the decrease in the heat generation amount Q.

(3) Effect As described above, in the steam humidifier 1 according to the present embodiment, the amount of heat generated in the regular waste water treatment is increased or decreased according to the variation in the amount of heat generated Q of the heating source 21, thereby generating a heat value. Even if the amount of heat generated in the heating tank 2 decreases due to a decrease in Q, it is possible to suppress a decrease in the amount of generated steam, and a humidifying operation can be performed in a range closer to the required humidity W. it can.

(Second Embodiment)
(1) Configuration The first embodiment is a constant drainage cycle system in which the drainage cycle is constant and the drainage amount is variable, whereas the second embodiment is that the drainage amount per time is constant, It is characterized by the constant drainage system that makes the variable. Specifically, as shown in FIG. 5, a cycle determining unit 72 is provided in the drainage control unit 7, and a preset drainage amount is stored in the storage unit 75. The other configurations are the same as those in the first embodiment, and thus the same reference numerals are given and detailed descriptions thereof are omitted.

  The cycle determination unit 72 determines a drainage cycle, which is an execution interval of the drainage treatment, according to the calorific value Q input from the heating control unit 6. The cycle determining unit 72 changes the drainage cycle so as to be inversely proportional to the increase / decrease in the calorific value Q when the calorific value Q varies. The determination of the drainage cycle by the drainage amount determination unit 71 is not limited to an inverse proportion, and the heat generation amount Q and the drainage cycle may be in a relationship of a decreasing function. The drainage cycle determined by the cycle determination unit 72 is input to the drainage device operation unit 73.

  The amount of drainage for each cycle is determined by the design of the steam humidifier 1 or by the user based on specifications such as the size of the heating tank 2, the target humidity required for the space to be air-conditioned, and the assumed drainage cycle. Pre-stored in the storage unit 75. If the amount of drainage at one time is too small, there is a possibility that the scale cannot be stably removed from the heating tank 2 at the time of discharging. Therefore, the amount of drainage is set to an amount that allows for stable scale removal without being too small. The amount of drainage stored in the storage unit 75 is input to the drainage device operation unit 73.

(2) Action The procedure of the wastewater treatment of this embodiment will be described with reference to FIG. FIG. 3 is a flowchart of the first embodiment. In the present embodiment, the process of step 04 is changed from the determination of the drainage amount to the determination of the drainage cycle.

  A command value S is input from the command unit 9 to the heating control unit 6 (step 01), and the heating control unit 6 obtains a calorific value Q of the heating source 21 necessary to satisfy the input command value S (step). 02). Next, the calorific value adjustment unit 21b is operated so that the calorific value of the heating element 21a becomes the value Q (step 03). At this time, the heating control unit 6 notifies the cycle determination unit 72 of the calculated calorific value Q.

  Next, the cycle determining unit 72 determines the drainage cycle according to the magnitude of the calorific value Q (step 04). The drainage cycle is determined so as to be inversely proportional to the increase or decrease in the calorific value Q. The determined drainage cycle is input from the cycle determination unit 72 to the drainage device operation unit 73.

  The drainage device operation unit 73 performs heating by opening and closing the drainage valve 4 while performing time management using the timer unit 74 according to the drainage cycle input from the cycle determination unit 72 and the drainage amount input from the storage unit 75. Water is discharged from the tank 2 through the drain pipe 13 (step 05).

  With reference to FIG. 6, a description will be given of a change in indoor humidity when the heat generation amount Q of the heating source 21 changes from “large” to “small”. 6 (a) and 6 (c) have the same contents as those of FIG. 4 (a) and (c) described in the first embodiment, and a description thereof will be omitted.

  (B) of FIG. 6 shows the humidity change in the room when the wastewater treatment is performed by changing the drainage cycle according to the calorific value Q with the drainage amount being constant. Since the calorific value Q has decreased, the drainage cycle fluctuates with T ′ longer than T. In this case, since the amount of drainage is L, the descent point A 'of indoor humidity due to drainage is almost the same as A. Further, since the calorific value Q is decreased, the recovery time from the descending point A 'is also B' longer than B in (a).

  However, by setting the drainage cycle to T ′ longer than T, the period C ′ until the next drainage treatment after the humidity recovery becomes longer than C and C ′ ′ in (a) and (c). Accordingly, in the case of (c), that is, compared with the case where the drainage cycle and the drainage amount are made constant with respect to the fluctuation of the calorific value Q, the recovery time for the humidity in the target room to be lower than the required humidity W is the same. The proportion of time during which the humidity W is maintained increases. Thereby, in (b), the maintenance time of the required humidity W in the drainage cycle T ′ can be secured longer, and the average error is smaller than in the case of (c).

(3) Effect As described above, in the steam humidifier 1 according to the present embodiment, the heat generation amount Q of the heating source 21 is decreased by changing the drainage cycle so as to be inversely proportional to the increase or decrease in the heat generation amount Q. Even if the wastewater treatment is performed, a decrease in humidity associated with the wastewater treatment can be suppressed to the same extent as when the calorific value is high when compared in a long time.

(Third embodiment)
(1) Configuration The third embodiment is a combination of the constant drainage cycle method described in the first embodiment and the constant drainage amount method described in the second embodiment. Therefore, the drainage control unit 7 is provided with both a drainage amount determination unit 71 and a cycle determination unit 72. Further, in order to switch between the constant drainage amount method and the constant drainage cycle method, the storage unit 75 that stores the minimum drainage cycle and the minimum drainage amount of each cycle is compared with the drainage amount determined by the minimum drainage amount and the drainage amount determination unit 71. A determination unit 76 is provided.

  In the present embodiment, the minimum drainage amount is the fixed drainage amount employed in the second embodiment, and the concentration of impurities contained in the water in the heating tank 2 can be kept below a certain level, and is deposited in the heating tank 2. This is the minimum amount required to discharge the scale stably to the outside.

  The minimum drainage cycle is a fixed drainage cycle set in advance in the first embodiment. From the viewpoint of lowering the humidity, even when draining with a minimum drainage amount at a certain calorific value Qx, a higher calorific value than that. Compared with, it refers to the period in which the decrease in humidity is suppressed to the same extent. Further, from the viewpoint of removing impurities, the minimum drainage cycle can be set to a minimum cycle that allows the impurity concentration to be within an allowable range even when the drainage amount is the minimum. That is, the allowable ranges for both the humidity reduction and the impurity concentration are different depending on the type of humidification target. Therefore, the minimum drainage cycle is determined in advance and stored in the storage unit 75 in consideration of these viewpoints.

(2) Action The action of the wastewater treatment of this embodiment will be described with reference to FIGS. 7, 8, and 9. FIG.
As shown in the flowchart of FIG. 8, first, when the command value S indicating the steam generation request amount is input from the command unit 9 to the heating control unit 6 (step 11), the heating control unit 6 sets the command value S to the command value S. Based on this, the calorific value Q of the heating source 21 is calculated (step 12). Next, the heating control unit 6 operates the heat amount adjusting unit 21b to set the heat generation amount of the heating body 21a to a value Q. (Step 13). At the same time, the heating control unit 6 notifies the drainage control unit 7 of the calculated calorific value Q.

  The drainage amount determination unit 71 calculates the drainage amount for each period according to the calorific value Q input from the heating control unit 6 (step 14), and inputs this to the determination unit 76. When the drainage amount is input from the drainage amount determination unit 71, the determination unit 76 determines whether the drainage amount is larger than the minimum drainage amount held in the storage unit (step 15).

  As a result of the determination, when the drainage amount input from the drainage amount determination unit 71 is larger than the minimum drainage amount (YES in step 15), the drainage amount determination unit 71 inputs the drainage amount to the drainage device operation unit 73 and the storage unit The minimum drainage cycle is input from 75 (step 16).

In this case, it says in FIG. 9, a greater (right side of figure) than Q _x the calorific value Q corresponding to the minimum amount of waste water. Here, a constant drainage cycle method is adopted in which the drainage cycle is constant and the drainage amount is variable according to the calorific value Q. That is, even if the calorific value Q increases, the amount of generated steam in the heating tank increases, and the rate of increase in the impurity concentration of water in the heating tank 2 increases, the amount of drainage increases accordingly. The impurity concentration of water in the tank can be maintained below a certain level.

On the other hand, when the drainage amount input from the drainage amount determination unit 71 is equal to or less than the minimum drainage amount (NO in step 15), the minimum drainage amount is input from the storage unit 75 to the drainage device operation unit 73, and the calorific value is output from the cycle determination unit 72. The drainage cycle determined according to Q and the minimum drainage amount is input (step 17). In this case, it says 9, the calorific value Q indicates the following cases Q _x (on the left in the figure). Here, the drainage amount is fixed to the minimum drainage amount, and the constant drainage amount method is adopted in which the drainage cycle is variable corresponding to the calorific value Q. As a result, even if the calorific value Q decreases, the amount of drainage for each drainage cycle is always kept above the minimum drainage amount, and by increasing the drainage cycle, the decrease in humidity is suppressed to the same extent as when there is a large amount of heat generation. Can do.

  After the drainage amount and drainage cycle are determined in this way, the drainage device operation unit 73 opens and closes the drainage valve 4 while performing time management using the timer unit 74 according to the determined drainage cycle and drainage amount. Thus, water is discharged from the heating tank 2 through the drain pipe 13 (step 18).

(3) Effect In this embodiment, since the drainage amount for each drainage cycle in the wastewater treatment does not become less than the minimum drainage amount, it is possible to prevent residual scale due to the fact that the drainage amount for each cycle is too small. Thereby, precipitation and adhesion of scale can be more reliably prevented by the waste water treatment.

  Further, if the amount exceeds the minimum amount of drainage, the problem of remaining scale due to the amount of wastewater being too small does not occur, so the system switches to a constant drainage cycle method, that is, a drainage method that increases the amount of drainage in response to an increase in calorific value Q. As a result, even if the calorific value Q rises and the amount of steam generated in the heating tank 2 increases, the amount of drainage increases corresponding to the calorific value Q, so the impurity concentration in the tank must be kept below a certain level. Can do.

  Further, the process of determining the amount of drainage for each cycle according to the change in the calorific value Q and determining whether or not the amount of drainage exceeds the minimum amount of drainage can be easily realized by using an electronic circuit or a microcomputer. In the present embodiment, by constantly monitoring the change in the calorific value Q using an electronic circuit, a microcomputer or the like, the humidification operation can be performed while switching both types in real time according to the fluctuation of the calorific value Q. That is, the affinity with the command unit 9 typified by a humidity controller or the like often used in air-conditioning targets for which high-precision humidity control is required is high. Therefore, by using in combination with such a command unit 9, it is possible to realize highly accurate humidity control.

(Other embodiments)
The embodiment of the present invention is not limited to the above embodiment, and includes other embodiments as described below.

(1) As shown in FIG. 10, preheating for preheating water to be supplied to a supply water pipe 11 connected to the heating tank 2 and the water supply tank 3 and serving as a flow path for water supplied from the water supply tank 3 to the heating tank. A device 14 may be provided. The temporary decrease in humidity due to the regular wastewater treatment is caused by the temperature of the water supplied from the water supply tank 3 to the heating tank 2 being lower than the temperature of the water in the heating tank 2. Therefore, by preheating the temperature of the water supplied from the water supply tank 3 to the heating tank 2, the temperature drop in the heating tank 2 accompanying the waste water treatment, that is, the amount of humidity drop during drainage can be suppressed, and it is closer to the target humidity. Humidity can be controlled in the range. In addition, as the preheating apparatus 14, well-known means, such as a sheathed heater and a heating coil, can be used, for example.

(2) Although the above embodiments assume that the required humidity is a constant value, the present invention is not limited to the steam humidifier 1 having a constant required humidity. In normal air conditioning, humidity control having an allowable range such as “high, medium, low” is often performed, and the present invention is also applicable to such humidity control. In particular, when performing humidity control having an allowable range, an upper limit value or an intermediate value of the allowable range is stored in the storage unit 75, and drainage treatment is performed when the humidity is at the upper limit value or the intermediate value. It is possible to shorten the time for the humidity decreased by the treatment to return to the lower limit value of the allowable range.

(3) When performing humidity control having an allowable range, if the amount of drainage per cycle is large, the humidity drop during drainage becomes large, and the room humidity to be humidified may fall below the lower limit of the required humidity range. Therefore, the lower limit value of the allowable range and the humidity decrease amount of the drainage amount with respect to the heat generation amount are stored in the storage unit 75, and the drainage amount with respect to the heat generation amount is controlled so that the decrease in humidity becomes equal to or greater than the lower limit value of the allowable range. . As a result, whatever the amount of heat generated, the amount of drainage can be set so that the indoor humidity is within the allowable range, and the present invention can be used even in the target room where humidity management is not permitted to cut the allowable range.

(4) In the above description, the heat generation amount Q obtained from the command value S by the heating control unit 6 is input to the drainage control unit 7, but if there is a proportional relationship between the command value S and the heat generation amount Q, the heating control unit 6 The command value S may be input to the drainage control unit 7 instead of the calorific value Q obtained by the above.

(5) Although a plurality of embodiments according to the present invention have been described in the present specification, these embodiments are presented as examples, and are not intended to limit the scope of the invention. Specifically, a combination of all or any of the embodiments is also included. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 Steam type humidifier 11 Replenishment water pipe 12 Pressure equalizing pipe 13 Drain pipe 14 Preheating device 2 Heating tank 21 Heating source 21a Heating body 21b Heat quantity adjustment part 22 Steam hole 23 Hose 3 Water supply tank 31 Automatic water tap 4 Drain valve 5, 50 Control part 6 Heating control unit 7 Drainage control unit 71 Drainage amount determination unit 72 Drainage cycle determination unit 73 Drainage device operation unit 74 Timer unit 75 Storage unit 76 Determination unit 9 Command unit S Command value Q Heat generation amount

Claims (4)

A heating tank for heating the water stored therein, and a heating tank for sending steam generated by the heating source to a space to be air-conditioned;
A water supply tank for supplying water into the heating tank;
A heating control unit that controls the amount of heat generated by the heating source in accordance with the amount of humidification of the air-conditioning target space;
A drainage device for periodically discharging water from the heating tank;
A drainage control unit for controlling the amount of drainage by the drainage device to increase or decrease according to the amount of heat generated by the heating source;
With
The drainage control unit
A storage unit for storing a minimum amount of drainage per drainage of the drainage device;
A determination unit that determines whether or not the amount of discharged water per time calculated according to the heat generation amount of the heating source exceeds a minimum amount of discharged water,
When it is determined by the determination unit that the amount of discharged water per time exceeds the minimum amount of discharged water, the amount of discharged water per time is increased or decreased according to the amount of heat generated by the heating source, with the drainage cycle being constant.
When the determination unit determines that the amount of discharged water per time is less than or equal to the minimum amount of discharged water, the amount of discharged water per time is made constant at the minimum amount of discharged water, and the drainage cycle is increased or decreased according to the heat generation amount of the heating source. A steam humidifier characterized by: The drainage control unit
A required humidity storage unit that stores a required humidity having a predetermined allowable range for the air-conditioned space;
Humidity of the space, so that the allowable range, the steam humidifier according to claim 1, characterized in that to control the periodic wastewater. The heating tank and the water supply tank are communicated by a makeup water pipe,
3. The steam humidifier according to claim 1, wherein at least one of a water supply tank and a makeup water pipe is provided with a preheating device for preheating water replenished from the water supply tank to the heating tank. A heating tank for heating the water stored therein, and a heating tank for sending steam generated by the heating source to a space to be air-conditioned;
A water supply tank for supplying water into the heating tank;
A drainage device for periodically discharging water from the heating tank;
A heating control unit that controls the amount of heat generated by the heating source in accordance with the amount of humidification of the air-conditioned space;
A steam humidifier drainage control method comprising:
When the minimum drainage amount per cycle of the drainage device and the drainage amount for each cycle calculated according to the heat generation amount of the heating source are compared, and the drainage amount for each cycle calculated based on the heat generation amount exceeds the minimum drainage amount Increases or decreases the amount of drainage per cycle according to the amount of heat generated by the heating source,
When the drainage amount per cycle calculated based on the calorific value is less than or equal to the minimum drainage amount, the drainage cycle is set to the minimum drainage amount, and the drainage cycle is increased or decreased according to the calorific value of the heating source. Drainage control method for steam humidifier.

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