JP4700318B2 - Drain discharge device for heat source machine - Google Patents

Description

The present invention relates to drain discharge of a heat source device used for hot water supply, heating, bath water pursuit, and the like, and relates to a drain discharge device for a heat source device that prevents the freezing of drain generated by heat exchange.

  As a heat source device used for hot water supply, heating, bath water pursuit, etc., a condensing type heat source device with improved heat conversion efficiency has been put into practical use. In this type of heat source machine, a primary heat exchanger that mainly recovers sensible heat from the combustion exhaust and a secondary heat exchanger that mainly recovers latent heat from the combustion exhaust are installed. The drain is generated. Since this drain is strongly acidic, it is discharged after neutralization. This drain is discharged outside the equipment by providing a drain circuit, or is forcedly discharged by a pump after being stored in a tank.

  The drain accumulated in the drain container or the like is discharged in a timely manner, but if the drain circuit or the drain in the drain container is frozen, the drain discharge may be delayed and the operation of the heat source apparatus may be hindered.

Therefore, regarding the prevention of freezing of the drain generated in such a heat source machine, a drain container for storing drain is provided with a heater, and when the temperature of the drain container becomes a predetermined temperature or lower, the heater is operated to prevent freezing. Yes (see Patent Documents 1 and 2).
JP-A-9-26291 JP-A-9-287727

  By the way, in the prevention of freezing of the drain described in Patent Document 1, a heater is installed on the bottom surface of the drain container to heat the stored drain, but a structure in which a certain amount of drain is discharged from the drain container by a siphon. Therefore, in order to prevent the residual drain that is not discharged by the siphon from freezing, the heater must be constantly supplied with power. In addition, in the prevention of the freezing of the drain described in Patent Document 2, the hot water path is wound around the drain storage container and the neutralizer to heat the drain, but the reservoir and the neutralizer are installed separately. Therefore, there is a possibility that a spiral portion is formed in the hot water path to cause a fluid resistance.

Therefore, the present invention relates to drain discharge of a heat source device used for hot water supply, heating, bath water pursuit, and the like, and an object thereof is to prevent freezing of the remaining drain.

In order to achieve the above object, a drain discharge device for a heat source device according to the present invention is a drain discharge device for a heat source device including a heat exchanger that generates drain by heat exchange, and is generated in the heat exchanger by the heat exchange. A drain tank for accumulating drain, a water level detecting means for detecting the water level of the drain tank, a drain circuit for leading the drain of the drain tank to the outside, a pump for forcibly guiding the drain to the drain circuit, A temperature detecting means for directly detecting the temperature or detecting the temperature of the part related to the drain temperature, and when the temperature detecting means detects a predetermined temperature or lower, and the water level detecting means detects a predetermined water level or higher. the pump is driven to forcibly drained the drain of the drain tank by the drain circuit, since the water level detecting means detects less than the predetermined level, the predetermined time An over the configuration and control means that stops the pump. According to such a configuration, drainage can be prevented from freezing by forced drainage.

  In order to achieve the above object, the control unit may determine that an abnormality occurs when the detected water level of the water level detection unit does not decrease even when the pump is driven, and generates a determination output.

  In order to achieve the above object, a configuration may be adopted in which neutralizing means for neutralizing the drain is provided. The neutralizing means may be installed at either the front stage or the rear stage of the drain tank. If neutralization means is installed in the front stage of the drain tank, the neutralized drain is stored in the drain tank. Further, if neutralization means is installed at the subsequent stage of the drain tank, the drain discharged from the drain tank to the drain circuit can be neutralized.

  According to the present invention, the following effects can be obtained.

  (1) Since residual drain that may freeze due to a temperature drop is discharged to the drain tank or drain circuit, drain freezing can be prevented.

  (2) Since the residual drain is heated, drain discharge is improved and drain discharge is not hindered by freezing.

(3) The drain circuit and the drain can be efficiently heated by utilizing the residual heat of the reheating circuit used for reheating the bath water for heating the drain.

  An embodiment of the drainage device of the heat source machine of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a hot water supply / heating / memorial device.

  The hot water supply / heating / remembrance device 2 is an example of a heat source machine having various functions such as hot water supply, heating, and bath water replenishment, and includes a heat source unit 4 for realizing the functions. The heat source unit 4 includes a drain discharge unit 6, a hot water supply function unit 8, a heating function unit 10, and a memory function unit 12. The hot water supply function unit 8 includes a first heat exchange unit 14 that heats the water W. The heating function unit 10 includes a second heat exchange unit 16 that heats the heat medium M, and the memory function unit 12 includes a heat exchanger 18 as a third heat exchange unit that heats the bathtub water BW using the heat medium M. Is provided.

  Burners 22, 24, 26 and an air supply fan 27 are installed in the combustion chamber 20 of the heat exchange unit 14, and fuel gas G is supplied to the burners 22, 24, 26 from a fuel gas supply pipe 28. The supply pipe 28 is provided with an original gas solenoid valve 30, a gas proportional valve 32, and gas solenoid valves 34, 36 and 38, and the combustion amount can be controlled by selective combustion of the burners 22, 24 and 26. The combustion exhaust E generated by the combustion flows from the burners 22, 24, and 26 toward the exhaust port 40, and the primary heat exchanger 42 that mainly recovers sensible heat from the combustion exhaust E, and the latent heat is mainly recovered from the combustion exhaust E. A secondary heat exchanger 44 is installed. A drain receiver 46 that collects the drain D generated by heat exchange is installed below the secondary heat exchanger 44.

  Burners 52, 54 and an air supply fan 56 are installed in the combustion chamber 50 of the heat exchange unit 16, and fuel gas G is supplied to the burners 52, 54 from the fuel gas supply pipe 28. The original gas solenoid valve 30, the gas proportional valve 62, and the gas solenoid valves 64 and 66 are installed, and the combustion amount can be controlled by selective combustion of the burners 52 and 54. The combustion exhaust F generated by this combustion flows from the burners 52 and 54 toward the exhaust port 70, the primary heat exchanger 72 that mainly recovers sensible heat from this combustion exhaust F, and the second that mainly recovers latent heat from the combustion exhaust F. A secondary heat exchanger 74 is installed. A drain receiver 76 that collects the drain D generated by heat exchange is installed below the secondary heat exchanger 74.

  The drain D stored in the drain receivers 46 and 76 is guided to the drain pan 84 on the installation surface of the bathtub 82 through the common drain circuit 80 and discharged to the outside from the discharge port 86 of the drain pan 84. In the drain circuit 80, a temperature sensor 88, a neutralizer 90, a drain tank 92, a drain pump 94, a check valve 96, a temperature sensor 98, a drain discharge port 100, and the like are installed. The temperature sensor 88 detects the temperature of the drain D guided to the neutralizer 90. The neutralizer 90 is loaded with a neutralizing agent 102 such as calcium carbonate for relaxing or neutralizing the strong acidity of the drain D. Regarding the neutralization treatment of the drain D, the neutralization method in the neutralizer 90 is not limited to the above method, and other methods may be used as long as the pH of the drain D is close to neutrality. In addition, a heater 104 is installed as a first heating means on the bottom surface of the neutralizer 90 in order to prevent the drain D from freezing. The drain tank 92 stores the drainage D after neutralization, and a water level sensor 106 is installed as means for detecting the water level of the drain D, and a heater 108 is installed as second heating means. The drain pump 94 is used for forcibly discharging the drain D from the drain tank 92 to the drain discharge port 100 side, and a heater 110 is installed as a third heating means. The check valve 96 prevents the backflow of the drain D from the drain discharge port 100 side, and the temperature sensor 98 detects the temperature on the downstream side of the drain circuit 80. In this embodiment, a drain conduit 112 that constitutes a part of the drain circuit 80 is connected to the drain outlet 100, and the drain D is guided to the drain pan 84. The drain pipe 112 is installed adjacent to the remedy pipes 114 and 115 of the remedy circuit 111 constituting a circulation path for heating the bathtub water BW by remedy, and the remedy pipes 114 and 115 are heated by means of heating. The heating pipe portion 113 is configured.

  The hot water supply function unit 8 is formed with a water supply circuit 120 that heats the water W supplied to the water supply port 116 through the secondary heat exchanger 44 and the primary heat exchanger 42 into the hot water HW and supplies hot water from the hot water supply port 118. Has been.

  The heating function unit 10 is provided with, for example, a heat medium circuit 122 that circulates a heat medium M made of hot water HW. The heat medium circuit 122 includes a heating tank 124 that stores the heat medium M, a heating pump 126, and a primary. A heat exchanger 72, a secondary heat exchanger 74, and the like are provided, and the heat medium M sent from the heat medium outlet 128 passes through the high-temperature heating device 130 and is heated from the heat medium return port 132 via the secondary heat exchanger 74. It returns to the tank 124 and circulates from the heat medium outlet 134 to the low-temperature heating device 136. Moreover, the heat medium M circulates from the branch path 138 to the heat exchanger 18, and the heat of the heat medium M is used for replenishing the bath water BW. A thermal valve 140 is installed in the branch path 138.

  Between the heat exchanger 18 and the circulation part 141 of the bathtub 82, the above-described additional piping 114 and 115 for circulating the bath water BW are connected. The additional piping 114 and 115 are connected to a switching valve. 142, a water flow switch 143, a pump 144, a temperature sensor 145, and the like are installed. Further, a pouring circuit 146 for pouring hot water HW from the water supply circuit 120 to the bathtub 82 through the memorial pipe 114 is formed between the salvage pipe 114 and the water supply circuit 120. In 146, a pouring electromagnetic valve 148 for controlling the pouring amount, a pouring amount sensor 150 for measuring the pouring amount, a check valve 152 for cutting off the water side and the bath water BW, and the like are installed. . The pump 144 is provided with a heater 139 as a heating means for the memory circuit 111.

  In addition, the heat source unit 4 is provided with a control device 154 that performs various controls such as hot water supply, heating, reheating or drainage, and the control device 154 includes a control unit 155 built in the heat source unit 4 and The remote controller 156 is configured.

  Next, the drain tank 92, the drain pump 94, the control part 155, etc. are demonstrated with reference to FIG.2 and FIG.3. 2 shows a specific configuration example of the drain tank 92, the drain pump 94, and the control unit 155, and FIG. 3 is a diagram showing an external configuration example of the neutralizer 90, the drain tank 92, the drain pump 94, and the like. .

  Drain D neutralized by the neutralizer 90 (FIG. 1) is introduced into the drain tank 92 from the drain introduction port 157. The drain D stored in the drain tank 92 is detected by the water level sensor 106. The water level sensor 106 is a level sensor using, for example, conductivity of the drain D, and includes a common electrode (COM) 158, a lower limit level electrode (L) 160, and an upper limit level electrode (H) 162, and the common electrode 158 If the drain D is in contact with the lower limit level electrode 160, a detection output indicating that the drain D is at the lower limit level L is output from the lower limit level electrode 160, and the drain D is supplied to the common electrode 158 and the upper limit level electrode 162. , A detection output indicating that the drain D is at the upper limit level H is output from the upper limit level electrode 162. These detection outputs are applied to the control unit 155 and used as control information such as control of the drain pump 94 and heating control of the drain D. On the bottom surface of the drain tank 92, a heater 108 for preventing the drain D from freezing is installed.

  The drain D of the drain tank 92 is guided from the bottom side thereof to the drain pump 94 through the pipe line 164 constituting the drain circuit 80, and is led from the pipe line 166 to the drain discharge port 100 (FIG. 1) side through the drain pump 94. . A control unit 155 is connected to the drain pump 94 and a heater 110 for heating the remaining drain D to prevent freezing is installed. The pipe 168 constitutes an air vent circuit of the drain pump 94 and a gas-liquid separation circuit when the drain pump 94 sucks itself.

  In the external configuration example shown in FIG. 3, the neutralizer 90 fixedly installed on the frame 169 of the heat source unit 4 is connected to the drain D from the drain pipe 173 of the drain circuit 80 connected to the upper lid portion 171. Is supplied. Drain pipes 175 and 177 are branched to the drain pipe 173, drain D from the heat exchange unit 14 is supplied to the drain pipe 175, and drain D from the heat exchange unit 16 is supplied to the drain pipe 177. The drain pipe 173 is provided with a temperature sensor 88 that detects the temperature of the drain D. In this configuration example, an overflow pipe 179 that discharges the overflow of the drain D is connected to the upper side of the drain tank 92, and the other end is connected to an overflow discharge port 181 attached to the frame 169. In addition, the same code | symbol is attached | subjected to the same part as the said embodiment, and the description is abbreviate | omitted.

  Next, an example of the above-described heating pipe portion 113 (FIG. 1) will be described with reference to FIGS. FIG. 4 is a diagram illustrating a connection relationship between the heat source unit and the bathtub, and FIG. 5 illustrates a configuration example of the heating pipe unit.

  As shown in FIG. 4, the above-described heating pipe portion 113 is drawn out from the heat source unit 4, and the circulation portion 141 of the bathtub 82 installed in the bathroom 170 is connected to the end portion thereof. The heating pipe portion 113 is formed by covering the drain pipe 112 and the remedy pipes 114 and 115 together with a covering cylinder 172 that is a heat insulation coating.

  As shown in FIG. 5, the drain pipe 112 and the remedy pipes 114 and 115 are collectively held by the holding tape 174 in the heating pipe portion 113, and a coating made of a bellows-like cylindrical body formed of a heat insulating material on the outer surface portion thereof. Covered with a cylinder 172.

  According to such a configuration, the drain pipe 112 is insulated from the outside air by the covering cylinder 172 and kept warm, and is heated and kept warm by the heat of the bath water BW that is hot water flowing through the additional pipes 114 and 115. Will be.

  Next, a configuration example of the control device will be described with reference to FIG. FIG. 6 is a block diagram illustrating a configuration example of the control device.

  As described above, the control device 154 includes the control unit 155 and the remote control device 156. The control unit 155 includes, for example, a microcomputer and includes a ROM (Read-Only Memory) 176, a RAM (Random-Access Memory) 178, a timer 180, and the like. The ROM 176 stores various setting information such as a freeze prevention operation program and a set temperature. The RAM 178 is used for temporary storage of operation data and the like. The timer 180 performs a timer function such as counting a clock for a set time.

  The control unit 155 receives detection outputs from the water level sensor 106, the water flow switch 143, the temperature sensors 88, 98, 145, other sensors 182 and the like as control information, and using these control information, the pouring electromagnetic valve 148 is supplied. , The control output for the heating pump 126, the drain pump 94, the pump 144, the heaters 104, 108, 110, the other functional units 184, and the like can be obtained.

  The remote control device 156 includes, for example, a control unit 186 configured with a microcomputer, an operation unit 188 such as a key switch, a display unit 190 such as an LED, and a notification unit 192 such as a voice utterance or a buzzer. The control units 155 and 186 can communicate with each other, an operation input is applied from the operation unit 188, a control output is applied to the display unit 190, the notification unit 192, and the like. Is displayed and a warning or the like is issued from the notification unit 192.

  Next, the first freeze prevention operation of the drain D will be described with reference to FIG. FIG. 7 shows the drain D wastewater treatment method or the wastewater treatment program procedure. This drain wastewater treatment includes failure detection processing.

  If the hot water supply / heating / mechanism device 2 is energized, the freeze prevention operation is executed even if the hot water supply operation, the chasing operation, or the like is stopped. In this freeze prevention operation, a freeze prevention operation point detection process is executed (step S1). The detection of the freeze prevention operating point is a process of determining whether or not the temperature at which the drain D in the heat source machine can be prevented from being frozen is lowered to a predetermined temperature slightly higher than the temperature leading to the freezing, for example, 6 ° C. A temperature setting equivalent to 0 ° C. is not preferable because the freezing of the drain D proceeds.

  For example, the detected information (atmosphere temperature) in the heat source unit 4 is used as the determination information of the freeze prevention operation point, for example, as the temperature of one of the detected temperatures of the temperature sensors 88, 98, and 145 or the portion related to the drain temperature. It may be used. Here, the temperature sensor 88 detects the inlet side temperature of the neutralizer 90, the temperature sensor 98 detects the outlet side temperature of the drain pump 94, and the temperature sensor 145 detects the bath water temperature from the additional piping 114. When all or two or more of the temperature sensors 88, 98, 145 and other temperature sensors are used, when any one of them detects a predetermined temperature, or an average value of the two or more detected temperatures is predetermined. Any of the cases where the temperature is reached may be used.

  Then, as a result of detecting the freeze prevention operation point, a detection operation of a predetermined temperature (for example, 6 ° C. or less) at which the detected temperature starts the freeze prevention operation is started (step S1), and the freeze prevention operation point is not detected Is stored (step S2), and the operation ends. When a freeze prevention operation point is detected, it is determined whether or not the freeze prevention operation has been completed (step S3). That is, it is confirmed whether or not the freeze prevention flag is set, and thereby, the drain pump 94 is prevented from meaningless driving. If the freeze prevention operation has been completed, it is determined whether or not the water level of the drain D in the drain tank 94 has risen above the lower limit level L (step S4). However, if it is equal to or higher than the lower limit level L, the drain pump 94 is operated (step S5), and the drain D is drained.

For example, 10 minutes is measured as the first discharge time T ₁ by the timer 180 when the drain pump 94 is started (step S6). The discharge time T ₁ is set to a time required to reach the lower limit level L from the upper limit level H by drainage of the drain D by driving the drain pump 94. It is determined whether or not the discharge time T ₁ has passed (step S7), and during the discharge time T ₁ it is determined whether or not the water level of the drain D has become less than the lower limit level L (step S8). when the water level in the drain tank 92 does not become less than the lower limit level L in T _1, it executes the alarm process as abnormality (step S9), and with ends the drain waste water treatment, and an abnormality on the display section 190 The alarm unit 192 generates a warning sound to notify the abnormality.

When detecting less than the lower limit level L during the discharge time T ₁ is triggered by the detection of less than the lower limit level L, the timer 180 and the second discharge time T ₂ for example, to measure the 30 seconds (step S10). This discharge time T ₂ sets the time from the lower limit level L to the completion of drainage of the drain tank 92 of the drain D and the drainage completion of the drain pipe 112 by driving the drain pump 94. It is determined whether or not the discharge time T ₂ has passed (step S11), and when the discharge time T ₂ has passed, the drain pump 94 is stopped (step S12), and drainage of the drain D is terminated. The freeze prevention completed operation is stored (step S13). That is, a freeze prevention flag indicating that drainage of the drain D has ended is set, and this processing is completed.

  By such a discharge process, the drain D is drained from the drain tank 92 and the drain piping 112 of the drain circuit 80 to the drain pan 84 by the drain pump 94 to prevent freezing. The drain D of the drain pan 84 is discharged from the discharge port 86 to an external drainage facility.

Further, in the alarm processing (step S9), the cause of the abnormality when the lower limit level L cannot be detected during the discharge time T ₁ is clogged due to freezing of the drain circuit 80, the failure of the drain pump 94, the water level sensor 106 There is a detection abnormality.

  Next, the second freeze prevention operation of the drain D will be described with reference to FIG. FIG. 8 shows a drain D wastewater treatment method or a wastewater treatment program processing procedure.

  In this freeze prevention operation, in order to prevent the drain circuit 80 from freezing, the heaters 108 and 110 provided in the drain circuit 80 are operated to heat the drain circuit 80. In this case, any one, two or more or all of the detected temperatures of the temperature sensors 88, 98, 145 and the like installed in the drain circuit 80 are used for the freeze prevention start information and the freeze prevention end information.

  Therefore, it is determined whether or not the detected temperature of the temperature sensors 88, 98, 145, etc. is below the freeze prevention operating temperature (step S21), and the temperature sensors 88, 98, 145 can be used alone or in combination. You may use it or use it all. The freeze prevention operation temperature is set to 6 ° C., for example, and if it is 6 ° C. or less, the freeze prevention operation is required. When the detected temperature is higher than the freeze prevention operation temperature, the freeze prevention operation is not performed. In step S21, the water level of the drain water D in the drain tank 92 is detected by the water level sensor 106 simultaneously with the temperature detection, and the drain water D is accumulated in the drain tank 92 only when the detected water level is equal to or higher than the lower limit level L. As a result, a configuration for performing the freeze prevention operation may be adopted.

  When the detected temperature is equal to or lower than the freeze prevention operating temperature (if water level detection is performed and the detected water level is equal to or higher than the lower limit level L), the heaters 108 and 110 are operated to heat the drain circuit 80 (step) S22).

  It is determined whether or not the detected temperatures of the temperature sensors 88, 98, 145, etc. have reached the freeze prevention end temperature (step S23). Here, the freeze prevention end temperature is set to 10 ° C., for example, and the detected temperature reaches 10 ° C. If this happens, the freeze prevention operation is terminated.

  In this freeze prevention operation, since the heaters 108 and 110 are operated when the temperature is lower than a predetermined temperature, unnecessary heating is not performed. Further, if the water level of the drain tank 92 is detected before the heaters 108 and 110 are operated, if there is no drain D, the freeze prevention operation is not performed and unnecessary heating is not performed. Furthermore, even if the drain circuit 80 is frozen, it can be thawed by heating the heaters 108 and 110. As a result, the drainage of the drain D is prevented and the drain discharge is not hindered.

  Next, the third freeze prevention operation of the drain D will be described with reference to FIG. FIG. 9 shows a drain D wastewater treatment method or a wastewater treatment program processing procedure.

  In this freeze prevention operation, in order to prevent the drain circuit 80 from freezing, the drain pipe 112 and the drain D of the drain circuit 80 are heated using the remaining heat of the additional pipes 114 and 115 bundled in the drain circuit 80. According to such a configuration, when the temperature at which the freeze prevention operation is to be started is detected, the drain circuit 80 is prevented from being frozen in conjunction with the freeze prevention operation of the tracking pipes 114 and 115 of the tracking function unit 12. If done, efficient freeze prevention is performed.

  In this case, it is determined whether or not the temperature sensor 145 has detected the freeze prevention start temperature that is the freeze prevention operation point (step S31). If the freeze prevention start temperature has not been detected, such processing is terminated. When the freeze prevention start temperature is detected, as a premise process for entering the freeze prevention operation, the pump 144 is driven and the presence or absence of the bath water BW is determined from the detection output of the water flow switch 143 by the bath water BW (step S32). . As a result, when there is no bathtub water BW, the heater 139 is operated to heat the tracking circuit 111, and the heaters 108 and 110 are operated to heat the drain circuit 80 (step S33). In some cases, the burner 52 of the heat exchanging section 16 is combusted, the heat medium M is circulated through the heat exchanger 18 and the bath water BW is reclaimed (step S34), and the freezing prevention operation of the amendment circuit 111 is performed. And the drain pipe 112 is heated by the heat of the bath water BW circulated through the additional pipes 114 and 115, and the drain D is prevented from freezing.

  Next, the fourth freeze prevention operation of the drain D will be described with reference to FIG. FIG. 10 shows a drain D wastewater treatment method or a wastewater treatment program processing procedure.

  This freeze prevention process is a combination of the heater heating and reheating process (FIG. 9) and the freeze prevention process (FIG. 7) by drainage of drain D.

  In this freeze prevention processing, steps S41 to S44 are the same as the processing procedures of steps S31 to S34 (FIG. 9) described above. Since the description of these processes overlaps, the description thereof is omitted. However, when the freeze prevention start temperature that is the freeze prevention operation point is not detected, the execution of the freeze prevention operation is stored (step S45). ), This process is completed. Further, after the processing of steps S43 and S44, it is determined whether or not the freeze prevention operation by heating has been completed (step S46), and when the freeze prevention operation by heating is completed, the drain D of the drain tank 92 is equal to or higher than the lower limit level L. (Step S47). If it is equal to or higher than the lower limit level L, and if the freeze prevention operation is not completed, the processing procedure after step S48 is executed. Steps S48 to S56 are the same processing as steps S5 to S13 (FIG. 7) described above, and the description thereof will be omitted.

  According to such a process, the drain D is prevented from being frozen by the heat treatment, and the drain D that has been avoided is discharged from the drain tank 92 by the processes in and after step S47, so that the drain D is reliably prevented from freezing. The

  Next, features and modifications of the above embodiment will be listed below.

  (1) In the above embodiment, the drain D generated in the heat source device is neutralized by the neutralizer 90 and then stored in the drain tank 92 and drained by the drain pump 94. In the case where no decrease in the drain D in the drain tank 92 is observed, an abnormality is assumed. In this case, the drain D before neutralization may be stored in the drain tank 92, and the drain D may be neutralized when discharged.

  (2) According to the above embodiment, it is possible to detect freezing of the drain circuit, clogging of the drain circuit, malfunction of the pump, abnormality of the water level sensor in the drain tank, and the like.

  (3) Since the drain D is drained by the drain pump 94 by draining the drain D of the drain tank 92 and the drain circuit 80, the freezing of the drain D is eliminated, and the freezing can be surely prevented.

  (4) The drain circuit 80 is provided with heaters 108, 110, etc. for preventing freezing in a drain tank 92, a drain pump 94, etc. as a heating means to prevent freezing.

  (5) The memory circuit 111 is arranged in parallel with the drain circuit 80, and the residual heat of the memory circuit 111 is used to prevent the drain D from freezing.

  (6) Regarding the temperature detection for preventing the drain D from freezing, in the above embodiment, the temperature sensors 88, 98, 145, etc. are used. However, a temperature detecting means for detecting the temperature of the portion related to the drain temperature is installed. For example, the outside air temperature may be used for drain freeze prevention information.

  (7) About the neutralization of the drain D, you may dilute using dilution water, such as bath water BW, without using the neutralizing agent 102.

(8) In the embodiment, the discharging process of the drain D of the drain tank 92, the time to reach the discharge time T ₁ to the lower limit level L by the driving of the drain pump 94, the drain tank 92 a discharge time T ₂ from the lower limit level L The discharge time T ₁ and T ₂ are measured by a single timer 180, and the start of measurement of the discharge time T ₂ is triggered by reaching the lower limit level L. the timer is provided to set the discharge time T ₁ to the first timer, by setting the discharge time T ₂ in the second timer, be configured to decrement the time elapsed from the discharging time T _1, T ₂ Good.

  (9) In the above embodiment, the drain pump 94 is driven to drain the drain D, and abnormality is determined based on the change in the water level in the drain tank 92, and a special sensor or the like for detecting abnormality is unnecessary. It is.

  (10) For example, a thermistor sensor can be used as each of the temperature sensors 88, 98, and 145, but other detection elements may be used for temperature detection.

  (11) In the above embodiment, the remedy pipes 114 and 115 are installed in the heating pipe section 113. However, the heat medium circuit 122 is installed, and the drain pipe of the drain circuit 80 is utilized using the residual heat of the heat medium circuit 122. The path 112 and the drain D may be heated.

  (12) In the above embodiment, the heater 104 is provided in the neutralizer 90 of the drain circuit 80. However, the heater 104 may be operated using the detected temperatures of the temperature sensors 88 and 98 as control information. The temperature may be controlled so as to be satisfactorily neutralized by temperature detecting means other than the temperature sensors 88 and 98.

As described above, the most preferable embodiment of the present invention has been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist, and such modifications and changes are included in the scope of the present invention.

The present invention relates to drain discharge of a heat source device used for hot water supply, heating, bath water pursuit, etc., and the drain discharge, heating of a drain circuit, etc. triggered by a temperature drop that may cause freezing of the drain caused by heat exchange As the heating means, freezing is prevented by heater heating, heating or heating using the remaining heat by reheating the bathtub water, etc., which are useful.

It is a figure which shows the hot-water supply / heating / remembrance apparatus which concerns on embodiment. It is a figure which shows the structural examples, such as a drain tank and a drain pump. It is a figure which shows the example of external appearance structures, such as a neutralizer, a drain tank, a drain pump. It is a figure which shows the piping structure of a heat source unit and a bathtub. It is a perspective view which shows an example of a heating piping part. It is a block diagram which shows the structural example of a control apparatus. It is a flowchart which shows 1st freezing prevention operation | movement. It is a flowchart which shows 2nd freezing prevention operation | movement. It is a flowchart which shows 3rd freezing prevention operation | movement. It is a flowchart which shows 4th freeze prevention operation | movement.

Explanation of symbols

2 Hot water supply / heating / remembrance device 4 Heat source unit 44, 74 Secondary heat exchanger 80 Drain circuit 88, 98 145 Temperature sensor (temperature detection means)
92 Drain tank 94 Drain pump 106 Water level sensor (water level detection means)
108, 110 Heater (heating means)
154 Control device (control means)

Claims (3)

A drain discharge device of a heat source unit including a heat exchanger that generates drain by heat exchange,
A drain tank for storing drain generated by the heat exchange in the heat exchanger;
Water level detection means for detecting the water level of the drain tank;
A drain circuit for guiding the drain of the drain tank to the outside;
A pump that forcibly guides the drain to the drain circuit;
Temperature detection means for directly detecting the temperature of the drain or detecting the temperature of a portion related to the drain temperature;
When the temperature detection means detects a predetermined temperature or lower and the water level detection means detects a predetermined water level or higher, the pump is driven to forcibly drain the drain of the drain tank by the drain circuit , and the water level from the detection means detects less than the predetermined level, a control unit that stops the pump by a predetermined time,
A drain discharge device for a heat source machine, comprising:   The drainage of a heat source unit according to claim 1, wherein the control means determines that an abnormality occurs when the detected water level of the water level detection means does not decrease even when the pump is driven, and generates a determination output thereof. apparatus.   The drain discharge device for a heat source apparatus according to claim 1, further comprising neutralizing means for neutralizing the drain.

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