JP3801885B2 - Latent heat recovery type water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a latent heat recovery type water heater that recovers latent heat energy of combustion exhaust gas and heats water. In particular, the present invention relates to a latent heat recovery type hot water heater in which a drain discharge system generated by condensing water vapor is improved so that piping work is not required.
[0002]
[Prior art]
In recent years, a latent heat recovery type water heater has been developed with a thermal efficiency of 90% or more, and is attracting attention as an energy-saving device.
FIG. 4 is a diagram schematically showing a configuration of a main body of a conventional latent heat recovery type hot water heater and a main piping system.
The water heater main body 50 has a main hot water supply system 51 that supplies hot water to the kitchen and the washroom, and a bath hot water supply system 53 that performs hot water supply to the bath and retreats. In the combustion chamber 55 of the main hot water supply system 51, a primary heat exchanger 57, a secondary (latent heat recovery) heat exchanger 59, a burner 61, a combustion fan 63, and the like are provided. In the combustion chamber 65 of the bath hot water system 53, a bath heat exchanger 67, a burner 69, and the like are provided.
[0003]
Combustion gas is supplied to each burner 61 and 69 through a gas supply pipe 71 from a gas supply source. An original gas solenoid valve 73 is provided at a branch portion from the gas supply pipe 71 to each burner. The gas supply pipe branched to each burner is provided with a gas proportional valve 75 and a gas electromagnetic valve 77, respectively. The amount of gas supplied to the burner of each hot water supply system is controlled by a gas proportional valve 75, and on / off of supply to each burner is operated by a gas electromagnetic valve 77. In addition, two gas switching valves 79 are provided in the gas supply pipe to the main hot water supply system 51 to adjust the amount of gas supplied to the main hot water supply system 51.
Each burner is provided with a spark plug 81 and a frame rod 85. Each spark plug 81 is ignited by an igniter 83 to burn the combustion gas supplied to each burner 61, 69. The frame rod 85 detects the presence or absence of a flame and prevents incomplete combustion.
[0004]
The main hot water supply system 51 has a water supply pipe 87 for supplying water from a water source and a hot water supply pipe 89 for supplying hot water to a kitchen or a washroom. The water supply pipe 87 passes through the secondary heat exchanger 59 in the combustion chamber 55, exits the combustion chamber 55, passes through the primary heat exchanger 57 again in the combustion chamber, and is connected to the hot water supply pipe 89. The combustion fan 63, the burner 61, the primary heat exchanger 57, and the secondary exchanger 59 in the combustion chamber 55 are sequentially arranged in the air blowing direction of the combustion fan 63, the burner 61, the primary heat exchanger 57, and the secondary heat exchanger 59. Are arranged side by side.
[0005]
A tray 91 is attached below the secondary heat exchanger 59 in the combustion chamber 55. The tray 91 communicates with the drain receiver 95 via the drain pipe 93. A drain plug 97 is provided on the bottom surface of the drain receiver 95, and a drain pipe 99 is provided on the top.
[0006]
Next, the latent heat recovery action by the primary heat exchanger 57 and the secondary heat exchanger 59 will be described.
The water supplied from the water supply pipe 87 first passes through the secondary heat exchanger 59. Then, it passes through the primary heat exchanger 57. Here, in the primary heat exchanger 57, combustion gas is supplied to the burner 61 and is ignited by the spark plug 81. Then, combustion air is sent from the combustion fan 63 and burned to generate flame and combustion gas. The primary heat exchanger 57 is heated by the radiant heat and combustion gas from the flame, and the water flowing in the pipe is heated. Then, the combustion gas is sent upward by the fan 63, that is, toward the secondary heat exchanger 59. The water vapor contained in the combustion gas contacts the secondary heat exchanger 59, and the water flowing through the piping of the secondary heat exchanger 59 absorbs the latent heat of the water vapor. Thereby, water vapor | steam condenses and changes to water.
[0007]
The water changed from the water vapor is dropped on the tray 91 and is accumulated in the drain receiver 95 through the drain pipe 93. When the drain receiver 95 reaches a predetermined water level, the water is drained from the drain pipe 99. The combustion gas is exhausted from an exhaust port 101 provided on the side of the secondary heat exchanger 59.
[0008]
On the other hand, the water passing through the secondary heat exchanger 59 absorbs the heat of condensation of the combustion gas and rises in temperature. And since the water whose temperature rose is sent to the primary heat exchanger 57, the hot water finally supplied is heated efficiently.
[0009]
The water supply pipe 87 and the hot water supply pipe 89 are connected by a bypass pipe 105 provided with a bypass electromagnetic valve 103. A thermistor 107 is provided in the water supply pipe 87, the hot water supply pipe 89a on the outlet side of the secondary heat exchanger, and the hot water supply pipe 89 downstream of the bypass pipe. These thermistors 107 detect the temperature of water in each pipe. By adjusting the bypass solenoid valve 103 of the bypass pipe 105 so that the temperature of the hot water supplied from the hot water supply pipe 89 becomes an appropriate temperature from these temperatures, the mixing amount of the hot water and water is changed.
[0010]
Further, the water supply pipe 87 is provided with a water amount sensor 109 to adjust the amount of water in the pipe. Further, the hot water supply pipe 89 is provided with a hot water supply high limit switch 111. The high limit switch 111 operates when the temperature in the heat exchanger 51 becomes higher than the above, and shuts off the electric circuit of the water heater 50. The hot water supply pipe 89 is also provided with a water control valve 113 to control the pressure of hot water supplied from the hot water supply pipe 89. Furthermore, a freeze prevention heater 115 is provided in a part of the water supply pipe.
[0011]
Next, the bath water supply system 53 will be described.
In the combustion chamber 65 of the bath hot water system 53, a bath heat exchanger 67, a burner 69, and the like are provided. The bath hot water supply system 53 includes a hot water supply pipe 117 branched from the hot water supply pipe 89 and the water supply pipe 87 of the main hot water supply system 51, an outgoing pipe 121 going from the combustion chamber 65 to the bathtub 119, and a return pipe returning from the bathtub 119 to the combustion chamber 65. 123. The forward pipe 121 and the return pipe 123 constitute a circulation pipe line between the bathtub 119 and the bath heat exchanger 67. The water level in the bathtub 119 is detected by a water level sensor 145.
[0012]
A branch pipe 117 a from the hot water supply pipe 89 and a branch pipe 117 b from the water supply pipe 87 are joined to the bath hot water supply pipe 117. The branch pipe 117a from the hot water supply pipe is provided with a pouring electromagnetic valve 125 and a check valve 127, and the branch pipe 117b from the water supply pipe is provided with a vacuum breaker 129 and a water injection electromagnetic valve 131. The vacuum breaker 129 and the check valve 127 are actuated when the water supply pressure becomes negative due to water cut or the like, and prevents the water in the bathtub 119 from flowing backward. The water injection electromagnetic valve 131 and the water injection electromagnetic valve 125 turn on / off the supply of water or hot water to the bath hot water supply system 53.
A pouring amount sensor 133 and a check valve 135 are provided downstream of the junction of each branch pipe. The pouring amount sensor 133 detects the amount of hot water supplied from the bath hot water supply pipe 117 to the circulation pipe. The check valve 135 prevents the reverse flow of water from the bath hot water supply system 53 to the main hot water supply system 51.
[0013]
The bath hot water supply pipe 117 is connected to the return pipe 123 via the switching valve 137. The return pipe 123 is provided with a pump 139 for circulating hot water in the circulation line. The pump 139 is provided with an overpressure prevention safety device 141, and controls the water pressure in the circulation pipe along with the temperature change of the circulating water. The return pipe 123 is provided with a water flow switch 143. The water flow switch 143 detects the flow direction of the circulating water in the circulation pipe to prevent the reverse flow of the circulating water. The return pipe 123 is further provided with a water level sensor 145 and a thermistor 147. The water level sensor 145 detects the water level in the bathtub. The thermistor 147 detects the temperature of the hot water in the return pipe, and the temperature of the hot water sent to the bathtub 119 is adjusted from this temperature.
[0014]
In the bath heat exchanger 67, combustion gas is supplied to the burner 69 and is ignited by a spark plug 81. Then, combustion air is sent from the combustion fan 63 and burned to generate flame and combustion gas. The bath heat exchanger 67 is heated by the radiant heat and the combustion gas due to the flame, and heats the hot water in the bath hot water supply pipe. At the time of reheating, hot water heated by the bath exchanger 67 by the operation of the pump 139 is sent to the bathtub 119 through the outgoing pipe 121. And it is sent to the bath heat exchanger 67 through the return line 123 from the bathtub 119, and circulates in the circulation line.
[0015]
A plurality of temperature fuses 149 are provided in the main body of the water heater 50, and are activated when the temperature inside the device becomes higher than that, thereby shutting off the electric circuit of the water heater 50. Further, the temperature signal detected by the thermistor described above is input to the electrical board 151 provided in the main body, and the valves, fans, and the like are controlled. The electrical board 151 is connected to the bathroom remote controller 153 and the kitchen remote controller 155, and operation of each part and temperature setting can be performed by remote controller operation.
[0016]
[Problems to be solved by the invention]
As described above, the conventional latent heat recovery type hot water heater needs to be provided with the drain pipe 99 for draining the condensed water (drain) generated by the condensation of water vapor. However, when a water heater is installed in a pipe shaft with one side facing the corridor, for example, in a recent apartment house, there is no drainage facility in the vicinity of the water heater. It takes a lot of work to do.
[0017]
This invention is made | formed in view of said problem, Comprising: It aims at providing the latent-heat-recovery type hot water heater which does not need piping construction of drain drainage.
[0018]
[Means for Solving the Problems]
A first latent heat recovery type water heater of the present invention is a latent heat recovery type water heater comprising a water heater main body and a bath hot water system for supplying hot water from the main body to a bathtub , wherein the water heater main body includes a gas burner, A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the combustion exhaust gas of the burner, a drain receiver that receives condensed water (drain) generated in the heat exchanger, and a drain that accumulates in the drain receiver. A drain delivery system for sending to the hot water supply system, and a sensor for detecting the water level of the bathtub, and a water level sensor for detecting “on the water level” and “in the water level” is attached to the drain receiver, and the drain water level is When the water level sensor is in the middle, the drain is sent when the detected value of the water level sensor of the bathtub is zero, and then the bath hot water system is purged. And performing a drain discharged in time. In the present specification, “the detection value of the water level sensor in the bathtub is zero water level” is also simply referred to as “the water level in the bathtub is zero”.
Since the drain is sent to the bath hot water system and drained together with the bath water, the drain drainage facility becomes unnecessary.
A second latent heat recovery type water heater of the present invention is a latent heat recovery type water heater comprising a water heater body and a bath hot water system for supplying hot water from the body to a bathtub, wherein the water heater body includes a gas burner, A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the combustion exhaust gas of the burner, a drain receiver that receives condensed water (drain) generated in the heat exchanger, and a drain that accumulates in the drain receiver. A drain delivery system to be sent to the hot water supply system, and a sensor for detecting the water level of the bathtub, and when the drain water level is medium, perform the drain delivery at the timing of performing the reheating operation in the bath hot water system, When the drain water level rises, drain discharge is performed at an arbitrary timing.
[0019]
In the present invention, if the neutralizing material is sealed in the drain receptacle or a neutralizing agent injection means is provided, the drainage can be neutralized and PH can be lowered. Alternatively, if a tap water injection means is attached to the drain receptacle, the drain can be neutralized with tap water.
Furthermore, if the bath hot water supply system is purged after the drain is delivered, the time during which the drain is stored in the hot water heater can be shortened, so that corrosion of each member in the heater can be prevented. .
[0020]
In the present invention, it is preferable that a sensor for detecting the water level of the bathtub is provided in the hot water heater, the drain feeding is performed when the water level of the bathtub is zero, and then the bath hot water system is purged. When the water level of the bathtub is zero, the drain is sent to the bathtub and the bath hot water system is purged, so that the drain does not mix with the water used in the bathtub and the user is not uncomfortable.
In particular, it is preferable to perform the drain delivery at the timing when the water level of the bathtub becomes zero, and then purge the bath hot water system. If the drain is sent out when the water level becomes zero when draining the bath, the user will not feel uncomfortable.
[0021]
In the present invention, a water level sensor for detecting “on the water level” and “in the water level” is attached to the drain receiver, and when the water level of the drain receiver is medium and the water level of the bathtub is zero, the drain delivery is performed. It is preferable to carry out. Or it is preferable to perform the said drain delivery at the timing when the water level of the said drain receptacle became medium and the water level of the said bathtub became zero.
The drain can be drained when the amount of drain stored in the drain receptacle becomes an appropriate amount.
[0022]
Alternatively, the drain delivery can be performed at the timing when the reheating operation is performed in the bath hot water supply system. The drain is mixed with a large amount of bath water, diluted sufficiently, and discharged into the bath. In addition, if it uses together with the Benchery structure described below, mixing with a drain and bathtub water can further be accelerated | stimulated. For this reason, it can be said that it does not substantially give a sense of incongruity to the bather. Moreover, the force which draws in a drain acts at the timing which circulates bath water with the circulation pump 139 (refer FIG. 4) of a bath hot-water supply system.
[0023]
In the present invention, if the drain pipe for delivering the drain of the drain receiver to the bath hot water system is connected to the return pipe line to the bath of the bath hot water system via a Benchery structure, the drain can be smoothly bathed. It can be sent to the hot water system.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a first embodiment of the present invention.
This bath water heater 1 is different from the bath water heater of FIG. 4 only in the structure of the drain receiver and the piping in the vicinity of the drain receiver, and other parts have the same structure and operation as the bath water heater of FIG.
[0026]
In the bath water heater 1, the drain receiver 3 is not provided with a drain pipe. The drain receiver 3 is connected to the forward pipe 121 of the bath hot water system via the drain pipe 5. The drain pipe 5 is provided with a pump 7, a check valve 9, and a drain electromagnetic valve 11. The pump 7 sends a drain from the drain receiver 3 to the forward conduit 121, and the check valve 9 prevents a back flow from the forward conduit 121 to the drain receptacle 3. The drain electromagnetic valve 11 opens and closes the drain pipe 5. Note that a bath solenoid valve 13 is provided in the forward pipeline 121 on the downstream side of the junction of the drain pipe 5 and the forward pipeline 121.
[0027]
The drain receiver 3 is provided with two water level sensors 15 for detecting the water level of the drain water in the drain receiver 3. By turning these sensors 15 ON / OFF, it is possible to know the water level in the drain receiver 3 in three stages: on the water level, during the water level, and on the low water level. The drain receptacle 3 is filled with calcium carbonate (solid) as a neutralizing agent.
[0028]
When draining the drain, the drain electromagnetic valve 11 and the bath electromagnetic valve 13 are opened and the pump 7 is operated. The drain in the drain receiver 3 enters the forward pipe 121 through the drain pipe 5, is sent to the bathtub 119, and is drained from the outlet of the bathtub.
[0029]
This drain discharge is performed at timings such as 1) when the drain water level rises, 2) when bathing, 3) when draining after bathing. For example, when 1) the drain water level rises and the drain water level is medium, 3) wait until draining after the completion of bathing and drain the drain. Alternatively, if the drain water level rises while waiting, drain discharge is performed at an arbitrary timing.
[0030]
FIG. 2 is a flowchart illustrating an example of drain drain control.
First, in S1, the user pulls out the drain plug of the bathtub. And in S2, it detects whether the detection value of the water level sensor of a bathtub is a water level zero. If the water level of the bathtub is zero, in S3, the drain valve 11 of the drain pipe 5 and the bath electromagnetic valve 13 of the forward pipe 121 are opened. In S4, the drain pump 7 is operated.
[0031]
In S5, the water level sensor 15 attached to the drain receiver 3 determines whether or not the water level is detected inside. If the water level is not below medium, repeat S3 and S4. When the water level falls below the middle level, the drain pump 7 is stopped in S6, and the drain valve 11 is closed in S7. In step S8, the bath hot water supply system is purged. That is, with the drain valve 11 closed and the bath solenoid valve 13 opened, warm water is sent to the bath water supply system, the pump of the bath hot water system is operated for a predetermined time, and the hot water is circulated in the circulation pipe and then drained. To do. Thereafter, the bath solenoid valve 11 is closed in S9.
[0032]
According to this method, since the bath hot water supply system is purged after draining the drain, the drain is thinned, and the piping and the like can be prevented from being corroded by the drain.
[0033]
In addition, 2) When performing bath reheating, the reheating operation is performed, the drain valve 11 is opened, the pump 7 is operated, and the drain is sent from the forward pipe 121 to the bathtub 119. When the drain is mixed with hot water from the bathtub, the pH becomes about 6.5 and does not affect the human body.
[0034]
FIG. 3 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a second embodiment of the present invention.
This bath water heater 21 also differs from the bath water heater of FIG. 4 only in the structure of the drain receiver and the piping in the vicinity of the drain receiver, and other parts have the same structure and operation as the bath water heater of FIG. In the bath water heater 21, a drain pipe 25 extending from the drain receiver 23 is connected to a return pipe 123 of the bath water heater system.
[0035]
The drain receiver 23 is a drain pipe 25 and is connected downstream of the water level sensor 145 in the return pipe 123. A check valve 27 and a drain valve 29 are attached to the drain pipe 25. In addition, a bath electromagnetic valve 31 is attached upstream of the water level sensor 145 in the return pipe 123. A water level switch 33 is attached to the drain receiver 23.
[0036]
The connecting portion between the drain pipe 25 and the return pipe line 123 has a Benchery structure as shown in an enlarged view in the drawing. That is, the cross-sectional area of the return pipe 123 near the connection portion is narrower than other portions. By connecting the drain pipe 25 to this portion, the drain from the drain pipe 25 can join the water in the return pipe 123 without resistance.
[0037]
When the amount of drain detected by the water level switch 33 of the drain receiver 23 exceeds a predetermined amount and the drain is discharged, the drain valve 29 is opened and the bath electromagnetic valve 31 is closed. When the pump 139 of the bath hot water system is operated, the drain is sent from the drain receiver 23 through the drain pipe 25 to the return pipe 123. In this example, since the bath 139 pump 139 is used, it is not necessary to provide a separate pump for the drain pipe 25.
[0038]
Moreover, if the bath electromagnetic valve 31 is opened and the pump 139 is operated, the drain can flow into the circulation line together with the bath water in the bathtub. Therefore, since the drain can be diluted with bath water, corrosion of piping and the like can be prevented.
[0039]
Further, in this example, when the drain is sent out during the chasing operation, the drain is sufficiently diluted by mixing a large amount of bath water. Furthermore, since mixing of drain and bathtub water is performed in the above-mentioned Benchery structure part, mixing of both is further accelerated | stimulated. Further, since the chasing operation may be performed relatively frequently, the amount of drain delivered is small and the amount of drain delivered in one operation is usually not so large. Even if such a small amount of drain is mixed with hot water, it does not affect the bather, and there seems to be no sense of incongruity to the bather.
[0040]
In addition, the solenoid valve 31 becomes unnecessary because the force for sucking the drain works at the timing of operating the circulation pump 139 during the reheating operation.
[0041]
Further, a tap water injection pipe 35 from a water source is provided above the drain receiver 23 via an electromagnetic valve 37. By injecting tap water into the drain, the drain is neutralized. In one example, the PH of mixed water obtained by mixing PH4 drain and tap water in the same volume was 5. Theoretically, in order to change the pH of a solution by 1, it is necessary to add 9 times the volume of pure water of this solution. However, from the relationship of ions contained in tap water, it is considered that the above results were obtained.
[0042]
Thus, the alkalinity of a drain can be relieve | moderated by providing a tap water injection | pouring means and mixing an appropriate amount of tap water with a drain.
[0043]
【The invention's effect】
As is clear from the above description, according to the present invention, since the drain accumulated in the drain receiver is sent to the bath hot water supply system, it is possible to provide a latent heat recovery type water heater that does not require piping work for drain drainage. .
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a first embodiment of the present invention.
FIG. 2 is a flowchart showing an example of drain drain control.
FIG. 3 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type water heater according to a second embodiment of the present invention.
FIG. 4 is a diagram schematically showing a configuration of a main body and a main piping system of a conventional latent heat recovery type water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bath water heater 3 Drain receptacle 5 Drain pipe 7 Pump 9 Check valve 11 Drain solenoid valve 13 Bath solenoid valve 15 Water level sensor 21 Bath water heater 23 Drain receptacle 25 Drain pipe 27 Check valve 29 Drain valve 31 Bath solenoid valve 35 Water supply Water injection pipe 37 Solenoid valve 33 Water level switch 50 Water heater main body 51 Main hot water supply system 53 Bath hot water supply system 55 Combustion chamber 57 Primary heat exchanger 59 Secondary (latent heat recovery) heat exchanger 61 Burner 63 Combustion fan 65 Combustion chamber 67 Bath heat Exchanger 69 Burner 71 Gas supply pipe 73 Original gas solenoid valve 75 Gas proportional valve 77 Gas solenoid valve 79 Gas switching valve 81 Spark plug 83 Igniter 85 Frame rod 87 Water supply pipe 89 Hot water supply pipe 91 Receptacle 93 Drain pipe 97 Drain plug 99 Drainage Pipe 101 Exhaust port 103 Bypass solenoid valve 105 Bypass pipe 10 Thermistor 109 Water quantity sensor 111 High limit switch 113 Water control valve 115 Freezing prevention heater 117 Bath hot water supply pipe 119 Bath 121 121 Outgoing pipe 123 Return pipe 125 Pouring solenoid valve 127 Check valve 129 Vacuum breaker 131 Pouring solenoid valve 133 Pouring water quantity sensor 135 Reverse Stop valve 137 Switching valve 139 Pump 141 Overpressure prevention safety device 143 Water flow switch 145 Water level sensor 147 Thermistor 149 Thermal fuse 151 Electrical board 153 Bathroom remote control 155 Kitchen remote control

Claims (6)

A latent heat recovery type water heater comprising a water heater main body and a bath hot water system for supplying hot water to the bathtub from the main body ,
The water heater body is
With a gas burner,
A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the combustion exhaust gas of the burner;
A drain receiver for receiving condensed water (drain) generated in the heat exchanger;
A drain delivery system for sending the drain accumulated in the drain receiver to the bath hot water system;
A sensor for detecting the water level of the bathtub;
With
A water level sensor for detecting “on the water level” and “during the water level” is attached to the drain receiver ,
When the drain water level is medium, when the detected value of the water level sensor of the bathtub is zero, the drain is sent out, and then the bath hot water system is purged,
A latent heat recovery type hot water heater , wherein drain discharge is performed at an arbitrary timing when the drain water level rises.   The latent heat recovery type hot water heater according to claim 1, wherein a neutralizing agent is sealed in the drain receptacle or a neutralizing agent injection means is attached.   2. The latent heat recovery type hot water heater according to claim 1, wherein tap water injection means is attached to the drain receptacle. The latent heat recovery type hot water heater according to claim 1, wherein the drain delivery is performed at a timing when a detection value of the water level sensor of the bathtub becomes zero . A latent heat recovery type water heater comprising a water heater main body and a bath hot water system for supplying hot water to the bathtub from the main body ,
The water heater body is
With a gas burner,
A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the combustion exhaust gas of the burner;
A drain receiver for receiving condensed water (drain) generated in the heat exchanger;
A drain delivery system for sending the drain accumulated in the drain receiver to the bath hot water system;
A sensor for detecting the water level of the bathtub;
With
When the drain water level is medium, the drain is sent out at the timing of the reheating operation in the bath hot water system,
A latent heat recovery type hot water heater , wherein drain discharge is performed at an arbitrary timing when the drain water level rises. Drain pipe for sending drain of the drain receiving to the bath hot water supply system is in the return line to the tub of the bath hot water supply systems, one of claims 1-5, characterized in that it is connected via a venturi structure The latent heat recovery type water heater according to claim 1.

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