JP2014199158A - Liquid supply device and heat source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormality of water solenoid valve provided in a hot water circulation path.SOLUTION: A hot water supply tip end side of a hot water storage tank 2 is connected to a hot water circulation path 40, and a circulation pump 23, a water solenoid valve 24, flow volume detection means 42, and a water heater 16 are provided in the hot water circulation path 40. After passage of preset preliminary rotation time after an initial operation for rotating the circulation pump 23 at a set high rotational speed in a state in which the water solenoid valve 24 is closed, the water solenoid valve 24 is opened. After passage of set high rotational speed continuation time, the circulation pump 23 is rotated at a set rotational speed corresponding to a set circulation flow volume. If a circulation flow volume detected at that time is lower than the set circulation flow volume, the rotational speed of the circulation pump 23 increases. However, if the rotational speed of the circulation pump 23 reaches an upper limit value before a difference between the set circulation flow volume and the detected circulation flow volume becomes equal to or smaller than an allowable flow volume, a series of operations starting at the initial operation are repeated. If a repetition number of times reaches a set number of times, it is determined that at least either the water solenoid valve 24 or the circulation pump 23 is abnormal and abnormality notification is made.

Description

  The present invention relates to a liquid feeding device having a function of feeding a liquid through a passage, and a heat source device including the liquid feeding device, a hot water storage tank, and an auxiliary heat source device.

  There is used a heat source device that includes a hot water tank and heats hot water in the hot water tank using exhaust heat of the fuel cell or heat using solar heat (for example, Patent Document 1, reference).

  FIG. 4 is a schematic system configuration diagram showing a heat source device under development. In the figure, a tank unit 4 as a main heat source device including a hot water tank 2 and a hot water discharge passage 9 is thermally connected to a fuel cell (FC) 1 via a heat recovery passage 3. The fuel cell 1 is formed of, for example, a polymer electrolyte fuel cell (PEFC) or the like, and reacts hydrogen extracted from fuel such as city gas with oxygen in the air by reverse reaction of water electrolysis. It is a power generation device that generates electricity.

  The heat recovery passage 3 is a passage that circulates liquid (here, hot water) between the fuel cell 1 and the hot water tank 2 as indicated by arrows A and A ′ in the figure. Is provided with a pump (not shown) for circulating the liquid in the heat recovery passage 3. Then, by driving the pump, the water in the hot water tank 2 is introduced into the fuel cell 1 through the heat recovery passage 3 as shown by an arrow A ′ in the figure to be cooling water, and this water is used when the fuel cell 1 generates power. After being heated by the generated waste heat, it passes through the heat recovery passage 3 as indicated by an arrow A in the figure, and accumulates in the hot water tank 2 as hot water having a temperature of 60 ° C. The heat recovery passage 3 is provided with a bypass passage 7 through a three-way valve 6 so that the liquid flowing from the fuel cell 1 side to the hot water tank 2 side can be passed through the fuel cell without passing through the hot water tank 2 as necessary. It is formed so that it can be returned to 1.

  In the hot water tank 2, hot water temperature detecting means 5 in the hot water tank 2 for detecting the temperature of the hot water in the hot water tank 2 is provided in the hot water tank 2 or on the outer wall of the hot water tank 2 with a space therebetween in the vertical direction of the hot water tank 2. A plurality (five in FIG. 4) are provided. The hot water temperature detection means 5a in the hot water tank provided at the top is filled with hot water up to a position lower than the upper end of the hot water tank 2 by a predetermined set length, that is, for example, to the upper end of the hot water tank 2. The amount of hot water 20 liters less than that of the hot water is provided at the position of the hot water surface when the hot water tank 2 is introduced.

The hot water passage 9 connected to the upper side of the hot water storage tank 2 is a passage through which the hot water formed in the hot water storage tank 2 is discharged (sent), and the hot water passing through the hot water passage 9 is connected to the hot water passage 9. The hot water supply temperature detecting means 11 for detecting the temperature of the hot water tank, the tank hot water / water mixer 12 as a hot water tank discharge hot water amount controller for changing the amount of hot water sent through the hot water passage 9, and the hot water supply through the hot water passage 9 And a tank side electromagnetic valve 13 for switching the presence or absence of the valve by opening and closing the valve. Although not shown in the figure, the heat source device having the hot water tank 2 has an overpressure relief valve for releasing the pressure to the outside when the pressure in the hot water tank 2 exceeds the allowable pressure. It is provided at an appropriate position (for example, a pressure relief passage connected to the hot water passage 9).

  Further, the water supply passage 8 to the heat source device is branched into a water supply passage 8a and a water supply passage 8b, one water supply passage 8 (8a) is connected to the lower side of the hot water tank 2, and the other water supply passage 8 is connected. (8b) is formed so as to merge into the hot water passage 9 at the merging portion 10. In the water supply passage 8b, a water mixer 14 is interposed as a water supply amount regulator for changing the amount of water flowing from the water supply passage 8b to the junction 10 side.

  A hot water introduction side of a water heater 16 as an auxiliary heat source device is connected to the junction 10 via a hot water introduction passage 15. The hot water heater 16 is provided with a hot water heat exchanger 17 as a heating means for heating the water to be passed by, for example, the combustion heat of a gas burner (hot water burner). The hot water fed through the tank unit 4 (water fed from the tank unit 4) is introduced into the hot water heater 16 through the hot water introduction passage 15 and heated by the hot water heat exchanger 17 as indicated by an arrow B ″ in the figure. The hot water heated by this follow-up heating function passes through the passage 18 and the hot water supply passage 19 in order, and is supplied to one or more hot water supply destinations. However, a hot water tap is provided at the front end side of the hot water supply passage 19, and the hot water heater 16 includes a hot water burner for heating the hot water heat exchanger 17, a combustion fan for supplying and exhausting air to the hot water burner, and the like. Appropriate components are provided, and Operation of the chasing heating function is performed by controlling the formed elements.

  In FIG. 4, reference numeral 25 denotes an incoming water temperature thermistor, reference numeral 26 denotes an FC high temperature thermistor for detecting hot water temperature introduced from the fuel cell 1 to the hot water tank 2, and reference numeral 27 denotes the hot water tank 2 to the fuel cell 1 side. Derived FC low temperature thermistor for detecting hot and cold water temperature, reference numeral 28 (28a, 28b) indicates a mixed thermistor for detecting mixed hot water temperature, reference numeral 29 indicates a feed water flow rate sensor, reference numeral 50 indicates a pressure reducing valve, and reference numeral 42 indicates a passage 18. A flow rate detecting means for detecting the flow rate of hot water supplied through the hot water supply passage 19, a reference numeral 30 is a pouring passage from the hot water heater 16 to the bathtub 31, and a reference numeral 32 is a heating passage connecting the heating device and the hot water heater 16. Show.

  FIG. 5 shows a system configuration diagram in which some of the pipes and components in the system configuration shown in FIG. 4 are omitted or shown by broken lines. As shown in FIG. One end side of the connection passage 21 is connected via the joint 20, and the other end side of the connection passage 21 is connected to a middle portion of the passage through which the hot water passes from the fuel cell 1 side to the hot water tank 2 side in the heat recovery passage 3. Yes. In addition, a connection passage 22 is provided in the heat recovery passage 3 to connect a middle portion of the passage for passing hot water from the hot water storage tank 2 side to the fuel cell 1 side and the front end side of the hot water discharge passage 9. A circulation pump 23 for circulating hot water and a pilot-type water electromagnetic valve 24 are interposed.

  Of the passage 18, the connection passage 21, and the heat recovery passage 3, the passages 3 a and 3 b (part of the region closer to the hot water tank 2 than the connection portion to the connection passage 21 and the connection portion to the connection passage 22) Further, a hot water circulation passage 40 that has the bypass passage 7, the connection passage 22, and the hot water introduction passage 15 and circulates the hot water as shown by an arrow C in the figure is formed.

  The hot water circulation passage 40 functions as a liquid feed passage having a function of feeding hot water as a liquid through the passage, the circulation pump 23 functions as a liquid feed pump, and the water electromagnetic valve 24 is a circulation pump. 23 is an electromagnetic valve for switching the presence / absence of water circulation (presence / absence of liquid feeding) to the hot water circulation passage 40 by driving the valve 23 by opening and closing the valve. The heat source device circulates in the hot water circulation passage 40 by driving the circulation pump 23 with the water electromagnetic valve 24 opened. The flow rate detection means 42 also has a function of detecting the flow rate of water (hot water) circulating through the hot water circulation passage 40. The hot water heater 16 has a circulating hot water heating function for heating hot water circulated through the hot water circulation passage 40 by the hot water heat exchanger 17, and the heating operation by the hot water heat exchanger 17 in this circulating hot water heating function is also performed by the hot water heater. This is done by controlling the 16 components.

  4 and 5, dots are marked in the passage portion through which hot water heated mainly by heating passes, and the temperature of the hot water heated in the hot water circulation passage 40 passes through the hot water circulation passage 40. In the hot water circulation passage 40, dots are marked in the region from the hot water outlet side passage 18 of the hot water heater 16 to the inlet of the bypass passage 7.

  4 and FIG. 5 is provided with a control device (not shown). The control device controls the tank hot water / water mixer 12 to flow from the hot water passage 9 to the junction 10 side. In addition to controlling the flow rate of hot water, the water mixer 14 is controlled to control the flow rate of water flowing from the water supply passage 8b to the merge portion 10 so that mixed hot water having an appropriate temperature is formed at the merge portion 10. Mixing flow rate control means is provided.

  When the hot water supply is stopped, this mixing flow rate control means controls the tank hot water / water mixer 12 and the tank solenoid valve 13 so that the flow rate of hot water flowing from the hot water passage 9 toward the junction 10 (the hot water from the hot water storage tank 2) is zero. To be in a state. When the hot water tap provided at the front end side of the hot water supply passage 19 is opened, the mixing flow rate control means is controlled by the tank hot water mixer 12 and the tank electromagnetic valve 13 as shown by an arrow B in FIG. While adjusting the flow rate of hot water flowing from the tap water passage 9 to the merge portion 10 side, the flow rate of water flowing from the water supply passage 8b to the merge portion 10 side as indicated by the arrow B ′ in FIG. Is adjusted so that the temperature of the mixed hot water formed in the merging portion 10 becomes a hot water supply set temperature or a temperature close to the hot water supply set temperature.

  This temperature adjustment is performed as follows, for example. That is, when the detected temperature of the hot water tank hot water temperature detecting means 5a is higher than a predetermined threshold (for example, hot water set temperature or hot water set temperature + 2 ° C.), first, for example, the detected temperature of the hot water tank tapping water temperature detecting means 11 The tank hot water mixer 12 and the water mixer 14 are controlled on the basis of the mixing set temperature, the hot water supply flow rate, the detected temperature of the incoming water temperature thermistor 25, and the mixing flow rate adjustment data given in advance corresponding to these values. Thus, mixing flow rate feedforward control is performed to adjust the flow rate of hot water flowing from the outlet hot water passage 9 to the merge portion 10 side and the flow rate of water flowing from the water supply passage 8b to the merge portion 10 side.

  Then, based on the difference between the detected temperature of the mixed thermistor 28 (28a, 28b) and the set mixing temperature, the tank hot water / water mixer 12 is set so that the detected temperature of the mixed thermistor 28 (28a, 28b) becomes the mixed set temperature. By performing the mixing flow rate feedback control for controlling the water mixer 14 to adjust the flow rate of hot water flowing from the outlet hot water passage 9 to the merging portion 10 side and the flow rate of water flowing from the water supply passage 8b to the merging portion 10 side, The temperature of the mixed hot water formed at 10 is adjusted.

  The mixing flow rate control means, instead of performing the mixing flow rate feedforward control, at the start of hot water supply, hot water having a preset flow rate is supplied from the hot water supply passage 9 side and from the water supply passage 8b side corresponding to the hot water supply set temperature. The tank hot water / water mixer 12 and the water mixer 14 are controlled so as to flow to the junction 10 respectively (for example, the flow rate adjustment of the tank hot water / water mixer 12 and the water mixer 14 is adjusted among the adjustment levels set in stages. If the level corresponding to the mixing ratio is selected, the levels of the tank hot water mixer 12 and the water mixer 14 are matched with the mixing ratio), and then the mixing flow rate feedback control is performed. It may be. Further, only the mixing flow rate feedback control may be performed without performing the mixing flow rate feedforward control.

  When the temperature of the mixed hot water formed in the merging unit 10 is set to a temperature close to the hot water supply set temperature or the hot water set temperature by the control by the kissing flow rate control means, the hot water set temperature or the vicinity of the hot water set temperature is set. The mixed hot water of the temperature is introduced from the junction 10 into the hot water heater 16 through the hot water introduction passage 15. At this time, the hot water heater 16 is not heated by the hot water supply heat exchanger 17, and passes through the passage 18 and the hot water supply passage 19. Hot water is supplied to the hot water supply destination.

  On the other hand, hot water having a mixed set temperature set to a temperature equivalent to the hot water supply set temperature cannot be supplied only by the flow rate control by the mixing flow rate control means when the detected temperature of the hot water temperature detection means 5a in the hot water tank is equal to or lower than the threshold value. In this case, the mixed hot water is heated by the hot water supply heat exchanger 17 by the operation of the additional heating function of the hot water heater 16 to create hot water having a hot water supply set temperature, and this hot water passes through the passage 18 and the hot water supply passage 19 to the hot water supply destination. Hot water is supplied.

  4 and 5, by opening the hot water tap provided in the hot water supply passage 18, the hot water stored in the hot water storage tank 2 receives the supply water pressure and passes through the hot water supply passage 9 as described above. As described above, hot water is supplied by being mixed with water from the water supply passage 8b or by being additionally heated by the water heater 16.

Japanese Patent No. 4359339

  Conventionally, a heat source device of a type (integrated type) in which the tank unit 4 and the water heater 16 are disposed adjacent to each other has been used. However, the heat source device under development includes the tank unit 4, the water heater 16, and the fuel cell. 1 can be individually arranged and connected to each other by pipes. In this case, for example, the tank unit 4 including the hot water storage tank 2 having a necessary capacity is selected from the plural types of tank units 4, and the tank unit 4 and the plural types of hot water heaters 16 are selected. The hot water heater 16 and the fuel cell 1 selected from the plural types of fuel cells 1 can be combined, and variations can be increased.

  Further, the individually arranged heat source device has an advantage that the heat source device can be formed by connecting the tank unit 4 or the like to the existing water heater 16. In this case, it is assumed that the tank unit 4 and the water heater 16 are arranged apart from each other, for example, the water heater 16 is arranged on the north side of the building and the tank unit 4 is arranged on the east side or the west side of the building. However, in such a case, the water solenoid valve 24 is opened to prevent the water in the hot water introduction passage 15 and the connection passage 21 from freezing during the hot water supply stop in winter and the like. As shown by an arrow C in FIG. 5, the circulating hot water heating function for heating the hot water supply heat exchanger 17 while circulating hot water in the hot water circulation passage 40 is appropriately performed. It becomes.

  However, if an abnormality such as failure of the water solenoid valve 24 provided in the hot water circulation passage 40 occurs, the operation of the circulating hot water heating function through the hot water circulation passage 40 cannot be performed properly, and the hot water circulation passage 40 This causes a problem that a part of the product freezes, and the heat source device may not be used.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a liquid-feeding pump or an on-off valve provided in a liquid-feeding passage having a function of feeding a liquid, such as a hot water circulation passage ( A liquid supply device and heat source device that can handle abnormalities in hot water circulation pumps and water solenoid valves are provided, and the heat source device can also prevent freezing of the hot water circulation passage according to the abnormalities. There is.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the liquid feeding device of the first invention has a liquid feeding passage having a function of feeding a liquid through the passage, and the liquid is fed to the liquid feeding passage by rotation driving in the liquid feeding passage. There are provided a liquid feed pump, an on-off valve for switching presence / absence of liquid feed by driving the liquid feed pump by opening / closing a valve, and a flow rate detecting means for detecting a flow rate of the liquid fed through the liquid feed passage. The on-off valve is opened after a predetermined pre-rotation time has elapsed after the initial operation of rotating the liquid-feeding pump at a predetermined high rotation speed with the on-off valve closed. After the lapse of the set high rotation duration, the liquid feeding pump is rotated at a set rotational speed corresponding to a predetermined set flow rate, and the detected flow rate detected by the flow rate detecting means and the setting are rotated when the liquid feeding pump is rotated. The difference from the flow rate is When the flow rate is outside the permissible flow range, liquid supply related element abnormality determination means for determining an abnormality in at least one of the opening / closing valve and the liquid supply pump, and the liquid supply related element abnormality determination means The liquid supply related element abnormality notification means for notifying the abnormality of the liquid supply related element when abnormality of the liquid related element is determined is used as means for solving the problem.

  The heat source device of the second invention includes a main heat source device having a hot water storage tank and having a function of supplying hot water from the hot water storage tank through a hot water discharge passage, and a water supply front end side of the hot water supply passage of the main heat source device Is connected to a hot water circulation passage provided outside the hot water storage tank, and the hot water circulation passage is provided with a circulation pump for circulating hot water in the hot water circulation passage by rotation driving, and the hot water circulation by rotation driving of the circulation pump. A water solenoid valve that switches the presence or absence of water circulation to the passage by opening and closing a valve, a flow rate detection means for detecting a flow rate of water circulating through the hot water circulation passage, and heating hot water circulating through the hot water circulation passage by a heating means An auxiliary heat source device having a circulating hot water heating function and a follow-up heating function for heating hot water introduced from the main heat source device through the hot water passage and the hot water circulation passage by the heating means. In order to detect an abnormality of at least one circulation-related element of the water solenoid valve and the circulation pump, the circulation pump is rotated at a preset high rotational speed with the water solenoid valve closed. The water solenoid valve is opened after a predetermined preliminary rotation time has elapsed after the initial operation, and the circulation pump is operated at a set rotational speed corresponding to a predetermined set circulation flow rate after a predetermined set high rotation duration time has elapsed. When the circulating pump is rotated and the detected circulating flow rate detected by the flow rate detecting means is smaller than the set circulating flow rate, the rotational speed of the circulating pump is increased stepwise or continuously. Before the difference between the set circulating flow rate and the detected circulating flow rate is less than or equal to a predetermined allowable flow rate. When the rotation speed of the circulation pump reaches a predetermined upper limit, the water electromagnetic valve is closed to repeat a series of operations from the initial operation to the rotation speed increase control operation. A circulation-related element abnormality determination unit that determines abnormality of the circulation-related element when the number of repetitions of the operation in the circulation-related element abnormality detection mode reaches a predetermined set number of times, and the circulation-related element abnormality determination unit Means for solving the problem is configured to include a circulation-related element abnormality notifying means for notifying abnormality of the circulation-related element when abnormality of the circulation-related element is determined.

  Further, the third invention is characterized in that, in addition to the configuration of the second invention, the water solenoid valve is a pilot-type solenoid valve.

  According to the liquid feeding device of the present invention, the liquid feeding related element abnormality determining means initially rotates the liquid feeding pump at a preset high rotational speed with the on-off valve provided in the liquid feeding passage being closed. After a predetermined preliminary rotation time has elapsed after the operation, the on-off valve is opened, and after a predetermined high rotation duration has elapsed, the liquid delivery pump is rotated at a set rotational speed corresponding to a predetermined set flow rate. When the difference between the detected flow rate detected by the flow rate detection means and the set flow rate is outside a predetermined allowable flow rate range when the liquid feed pump rotates, at least the on-off valve and the liquid feed pump By determining the abnormality of one liquid feeding related element, it is possible to appropriately determine the abnormality of the liquid feeding related element.

  Then, when the abnormality of the liquid feeding related element is judged by the liquid feeding related element abnormality judging means, the liquid feeding related element abnormality notifying means notifies the abnormality of the liquid feeding related element, thereby notifying the abnormality of the liquid feeding related element. Users can be notified appropriately.

  Further, according to the heat source device of the present invention, a water supply front end side of the hot water supply passage of the main heat source device having a hot water storage tank and having a function of supplying hot water from the hot water storage tank through the hot water supply passage is provided outside the hot water storage tank. The hot and cold water circulation function of heating the hot and cold water circulating through the hot and cold water circulation passage by the heating means of the auxiliary heat source device interposed in the hot and cold water circulation passage is used in a cold region. Even if the heat source device and the auxiliary heat source device are arranged apart from each other, it is possible to prevent freezing of the hot water circulation passage in winter, and the auxiliary heat source passes through the passage between the hot water passage and the auxiliary heat source device in the hot water circulation passage. The operation of the hot water additional heating function introduced into the apparatus can also be performed without any trouble.

  Furthermore, according to the heat source device of the present invention, the circulation-related element abnormality detection mode control means is provided, and when the number of repetitions of the operation in the circulation-related element abnormality detection mode reaches a predetermined number of times, the hot water circulation passage Since the circulation-related element abnormality determination means determines the abnormality of the circulation-related element abnormality of at least one of the water solenoid valve and the circulation pump provided in the circuit, and the circulation-related element abnormality notification means notifies the abnormality of the circulation-related element. It is possible to notify the abnormality of the circulation related elements (water electromagnetic valve and circulation pump). Therefore, it is possible to take measures such as repairing or exchanging the water solenoid valve or the circulation pump, and accordingly, it is possible to appropriately circulate hot water through the hot water circulation passage. It is possible to prevent the passage from freezing.

  Furthermore, if the water solenoid valve is a pilot-type solenoid valve, the pilot-type solenoid valve is difficult to open when the flow rate is small, and can be easily opened by increasing the flow rate. During the operation of the function, after the initial operation of rotating the circulation pump at a preset high rotation speed with the water solenoid valve closed, the water solenoid valve is opened after a predetermined preliminary rotation time has elapsed. Therefore, if the water solenoid valve and the circulation pump are normal, the water solenoid valve can be opened properly and hot water can be circulated through the hot water circulation passage. Can do.

It is a block diagram which shows the control structure of one Example of the heat-source apparatus which concerns on this invention. It is a time chart which shows the operation example of the function of the circulation related element abnormality detection mode when the circulation related element is normal in the heat source device of the embodiment. It is a time chart which shows the operation example of the function of the circulation related element abnormality detection mode when there is abnormality in the water electromagnetic valve in the heat source device of the embodiment. It is explanatory drawing for demonstrating the system configuration example of the heat source apparatus in an Example and development. FIG. 5 is a system configuration diagram showing a part of the configuration of FIG. 4 in a simplified manner in order to describe a hot water circulation passage and a hot water discharge passage of the hot water tank provided in the heat source device shown in FIG. 4.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same constituent elements as those in the above-described examples, and the duplicate description is omitted or simplified.

  FIG. 1 is a block diagram showing a control configuration of an embodiment of a heat source device according to the present invention. This embodiment has the same system configuration as that of the heat source device shown in FIG. 4, and further, as shown in FIG. 1, the control device 33 in the tank unit 60 includes control means for the circulation related element abnormality detection mode. 37, a circulation flow rate control means 57, a circulation related element abnormality determination means 38, and a memory unit 39 are provided, and a circulation related element abnormality notification means 41 and a circulation flow rate setting are provided in a remote control device 43 connected in signal to the control device 33. An operation means 44 is provided. The circulating flow rate setting operation means 44 may be provided in the control device 33 in the tank unit 60 or the like. Further, the circulating flow rate setting value set by the circulating flow rate setting operation means 44 may be a value that can be appropriately changed by a user or the like, or may be a fixed value that is determined in advance. The remote control device 43 is installed indoors at an appropriate place such as a living room, a bathroom, a kitchen, or a washroom.

  The circulation flow rate control means 57 is a means for controlling the circulation flow rate of the water to be circulated through the hot water circulation passage 40 by the rotation control of the circulation pump 23, and based on the command of the control means 37 in the circulation related element abnormality detection mode. 23 is appropriately controlled.

  The control means 37 in the circulation-related element abnormality detection mode controls the opening / closing operation of the water electromagnetic valve 24 while taking in the detected flow rate detected by the flow rate detection means 42 when circulating hot water in the hot water circulation passage 40, or circulates. The operation of the characteristic circulation-related element abnormality detection mode described below is controlled by adding a command to the flow rate control means 37 to control the rotation of the circulation pump 23.

The operation of the function of the circulation-related element abnormality detection mode is, for example, as shown in FIGS. 2A, 2B, 3A, 3B, in a state where the water electromagnetic valve 24 is closed ( Off)) to rotate the circulation pump 23 at a predetermined high rotation speed (R ₀ ) (that is, the frequency for rotating the circulation pump 23 is 140 Hz in this case), and then a predetermined spare After the rotation time T1 (for example, 1 second) elapses, the water electromagnetic valve 24 is opened (turned on), and a predetermined set high rotation duration time T2 (for example, 1.5 seconds) is allowed to elapse.

  Thereafter, for example, in order to rotate the circulation pump 23 at a set rotational speed corresponding to a preset circulating flow rate Qs (see FIG. 2C) determined in advance by operating the circulating flow rate setting operation means 44 of the remote control device 43, for example, FIG. (A) As shown in FIG. 3 (a), the frequency for rotating the circulation pump 23 is rotated as a set frequency Hs set in correspondence with the set circulation flow rate Qs.

  In this embodiment, for example, the set frequency is 90 Hz when the set circulation flow rate is 3.5 liters / minute, 100 Hz when the set circulation flow rate is 5.0 liters / minute, and the set circulation flow rate is 7.0 liters / minute. In this case, it is set to 110 Hz. And at the time of rotation control of these circulation pumps 23, the detected circulation flow rate detected by the flow rate detection means 42 provided in the water heater 16 is taken in every predetermined set interval, for example, and the value is set to the set circulation flow rate Qs. If it is smaller than that, a pump rotation speed increase control operation is performed in which the rotation speed of the circulation pump 23 is increased stepwise in proportion to the time for each set interval.

  When the pump rotation speed increase control operation is performed, when the water solenoid valve 24 is normal, the set circulation flow rate Qs and the detected circulation flow rate Qt are equal (or as shown in FIG. 2C). Since the difference between the set circulating flow rate Qs and the detected circulating flow rate Qt is equal to or less than a predetermined allowable flow rate, the pump rotational speed is maintained in this state (the circulating pump 23 is rotated at the frequency at that time). ) To circulate hot water of the set circulation flow rate Qs in the hot water circulation passage 4.

  On the other hand, for example, when an abnormality has occurred in the water solenoid valve 24, the detected circulating flow rate Qt and the set circulating flow rate are set such that, for example, the detected circulating flow rate Qt remains 0 as shown in FIG. Since the difference from Qs does not become the allowable flow rate or less, the pump rotation speed up control operation is continuously performed. When the rotation speed of the circulation pump 23 reaches a predetermined upper limit value (here, the frequency for rotating the circulation pump 23 is 160 Hz) by the pump rotation speed increase control operation, the water electromagnetic valve 24 is closed. The series of operations from the initial operation to the rotation speed increase control operation is repeated. The upper limit value may be a value within a predetermined range, for example, a value within a range between 155 Hz and 160 Hz.

  The control means 37 for the circulation-related element abnormality detection mode performs the circulation-related element abnormality every time a series of operations from the initial operation to the rotation speed increase control operation by the function of the circulation-related element abnormality detection mode is performed once. A circulation-related element abnormality detection operation end signal is added to the abnormality determination means 38.

  The circulation-related element abnormality determination means 38 receives the circulation-related element abnormality detection operation end signal from the control means 37 in the circulation-related element abnormality detection mode, and counts the number of times of reception, that is, the circulation-related element. When the number of repetitions of the operation of the function in the abnormality detection mode reaches a preset number of times (for example, 4 times), an abnormality of the circulation related element is determined, a circulation related element abnormality determination signal is output, and the remote control device 39 is output. Add.

  The circulation-related element abnormality notification means 41 of the remote control device 39 receives a circulation-related element abnormality determination signal and displays an abnormality of the circulation-related element when the abnormality of the circulation-related element is determined by the circulation-related element abnormality determination means 38. Or by appropriate methods such as voice.

  In addition, in order to prevent the freezing of piping and the like when the outside air temperature falls, abnormalities related to the circulation are detected at the start of the freeze prevention operation in which the waste heat (hot water) of the fuel cell 1 or hot water obtained by burning the water heater 16 is circulated. When an abnormality of the circulation-related element is detected by the operation of the abnormality detection mode function by the detection mode control means 37, the hot water circulation through the hot water circulation passage 40 cannot be performed normally. This means that the hot and cold water flowing in the hot water circulation passage 40 cannot prevent freezing, so that the freezing prevention by circulation is given up and the drainage operation is performed to prevent freezing.

  By the way, for example, a cross-linked polyethylene pipe may be used as a liquid supply passage having a function of supplying liquid through the passage (corresponding to the hot water circulation passage 40 for circulating hot water in this embodiment). This pipe has a minimum bending radius for each pipe diameter, but it may be pulled in the middle of construction. The minimum bending radius may be interrupted at a place where it cannot be seen. It may become cramped when it becomes. In this embodiment, a cross-linked polyethylene pipe is used for the hot water circulation passage 40, and its length is determined by how far the hot water tank 2 and the hot water heater 16 are installed.

  The liquid feed pump such as the circulation pump 23 used in this embodiment includes a mechanical type in which the motor rotation shaft and the impeller rotation shaft in the liquid feed portion are directly connected through the water seal portion, the motor rotation shaft and the impeller. There are two types of magnet types that do not penetrate through the water seal by connecting the rotating shaft with a magnetic force. In the mechanical type, there is a possibility of water leakage, but if the motor rotates (unless the rotating shaft is broken), the impeller also rotates. For the magnet type, there is no possibility of water leakage. For example, if the motor is started at a high speed to suddenly generate a large flow rate, the impeller will not rotate easily even if the motor rotation shaft is turned. In such a case, there is a case where the magnetic force is disconnected and the impeller does not rotate even when the motor rotates.

  Furthermore, there are AC motors and DC brushless motors, and AC motors have the property that they cannot be rotated at low speed by phase control unless they are started once. However, DC brushless motors can produce high torque even at low speeds. In this embodiment, a magnet type liquid feeding pump using a DC brushless motor is used as the circulation pump 23.

  In addition, the open / close valve that switches the presence / absence of liquid supply by opening / closing the valve (in this embodiment, the water electromagnetic valve 24 that switches the presence / absence of hot water circulation by opening / closing the valve) has a simple butterfly valve or structure that opens slowly. There are direct-acting solenoid valves, etc. that open quickly and pilot-type solenoid valves with a complex structure using many pores (the opening operation is quick). Although a butterfly valve, a direct acting solenoid valve, and the like are simple in structure, the larger the differential pressure at both ends of the valve, the more expensive the force required to open the valve. On the other hand, a pilot-type solenoid valve with a complicated structure using many pores is more likely to open as the differential pressure at both ends of the valve increases (if the large differential pressure can be maintained for a predetermined time, the valve open state is ensured). However, if the pressure difference across the valve is not large, the valve will not open, and dust will clog the pores, and failure will easily occur.

  When a force is gradually applied to the solid, the solid starts to move when the magnitude of the force F acting on the object exceeds μN. When the object starts to move, the frictional force f changes at that moment, and the solid can continue to move with a frictional force f 'that is smaller than the force immediately before starting to move. When the solid is not moving with respect to the contact surface, if the maximum value of the frictional force is fmax = μN (μ: static friction coefficient, N vertical drag), it can be expressed as f ′ = μ′N <fmax (μ Therefore, the frictional force (f, fmax, f ′) when moving the solid is proportional to the normal force (weight). On the other hand, in the case of a liquid or gas, since the shape is deformed unlike a solid, fmax does not exist, and f ′ is obtained from the resistance (viscosity resistance) when it is deformed and shifted. Since this resistance force increases in proportion to the velocity ν of the object, the magnitude f ′ of the viscous resistance is expressed as f ′ = kν using the proportionality constant k.

  However, despite the fact that it is a liquid, as in the case of a solid, if the liquid volume (weight) in the pipe to which the pump tries to move is large, the liquid in the pipe is difficult to move (a large pump is required to start flow) However, once it starts moving, it can send liquid even with a weak force (even a small pump). Further, if a liquid is suddenly flowed at a large flow rate at the beginning of this movement, a large force (large pump) is required for the acceleration.

  Therefore, in this embodiment, the water electromagnetic valve 24 that stores the force of the circulation pump 23 is disposed on the downstream side of the circulation pump 23, and the circulation pump 23 is closed at a predetermined set high speed with the water electromagnetic valve 24 closed. The power is stored by rotating the number, and after a predetermined preliminary rotation time (time for storing the force) has elapsed after the initial operation, the on-off valve is opened to release the stored force all at once, and in the pipe of the hot water circulation passage 40 After the elapse of a predetermined set high rotation duration as the time when the liquid starts to move, the circulating pump 23 is rotated at the set frequency Hs (for example, as f ′ corresponding to ν of 3.5 liter / min) Apply a voltage and current at a rotation speed of 90 Hz and rotate the pump at a set rotation speed (90 Hz, 270 rpm) to prevent liquid (hot water) from suddenly flowing at a large flow rate. Go up the rotational speed is in the (pump continue to up the frequency for the rotation) as.

  When the difference between the detected flow rate detected by the flow rate detection means and the set flow rate when the circulating pump 23 rotates is outside the predetermined allowable flow rate range (specifically, as described above, the pump rotation speed up control operation) When the number of rotations of the circulation pump 23 reaches a predetermined upper limit value when the difference between the detected flow rate and the set flow rate does not fall within the allowable flow rate range), the water solenoid valve It is determined that there is an abnormality in at least one circulation-related element of 24 and the circulation pump 23.

  By performing the operation in the circulation-related element abnormality detection mode as described above, the rapid acceleration of the circulation pump 23 can be limited, so that the circulation pump 23 can be reduced in size and a plurality of impact flows (water solenoid valve 24 is closed). For example, the water electromagnetic valve 24 is formed by driving the circulation pump 23 to store the liquid feeding force of the circulation pump 23 and then opening the water electromagnetic valve 24 to release the stored force all at once. The pilot passage (pore) of the pilot solenoid valve can be clogged, giving an opportunity to return to the normal state from the failure state, and the abnormality of the circulation-related element can be detected appropriately.

  Specifically, the abnormality of the water solenoid valve 24 is, for example, clogging of the pilot passage (pore) of the pilot solenoid valve forming the water solenoid valve 24 or, for example, 1 second or more due to air biting, for example. Even if the motor rotation shaft is rotated by idling (for example, idling that jumps up to 833 Hz and 2500 rpm lasts for more than 1 second even though the pump is rotating at 90 Hz by applying a voltage and current of 90 Hz, due to friction) Abnormalities such as a situation where the impeller is difficult to rotate may occur.

  Further, when constructing the heat source device as in the present embodiment, the construction contractor is requested to construct the pipe connecting the tank unit 4 and the water heater 16 with a pipe material having a specified pipe diameter, for example, a hot water tank. Although a request is made to input and set the piping distance between 2 and the water heater 16 to the substrate of the controller 33 of the tank unit 4, the contractor does not always act as requested. That is, for example, a pipe material pipe diameter as specified is not always used, and the pipe distance may not be input and set, and may be left at a predetermined initial value in the control device 33. In some cases, the piping distance is abnormally long. In such a situation, even if the water solenoid valve 24 is normal, the difference between the set circulating flow rate Qs and the detected circulating flow rate Qt may not be equal to or less than a predetermined allowable flow rate.

  In such a case, as shown in FIGS. 2 (a) and 3 (a), after the set high rotation duration time, the circulation pump is used even though there is no abnormality in the water solenoid valve 24. Even if the frequency for rotating 23 is rotated as the set frequency Hs set corresponding to the set circulating flow rate Qs, the difference between the detected circulating flow rate Qt and the set circulating flow rate Qs at that time is not less than the allowable flow rate. When the pump speed increasing control operation as described above is performed, the difference between the detected circulating flow rate Qt and the set circulating flow rate Qs may be less than the allowable flow rate before the rotating speed of the circulating pump 23 reaches the upper limit value. Some hot water that has not been circulated even when the circulation pump 23 is rotated at the set frequency Hs starts to circulate before reaching the upper limit value by the pump rotation speed up control operation, and the detected circulation flow rate Qt and the set circulation rate are increased. In some cases the difference between the flow rate Qs is less than or equal to the allowable flow).

  Thus, when the situation in which the difference between the detected circulation flow rate Qt and the set circulation flow rate Qs falls below the allowable flow rate during the pump rotation speed increase control operation occurs, Although the situation is unexpected, it is determined that it can be used, and the relationship between the set circulation flow rate Qs and the detected circulation flow rate Qt is reviewed (learned), and the set circulation is performed during the next pump rotation speed up control operation. The set rotational speed Hs of the circulation pump 23 corresponding to the flow rate Qs may be a value changed based on the learned relationship.

  For example, based on the learned relationship, when the frequency of the circulation pump 23 when the hot water circulation is started (the frequency at which the circulation pump 23 is rotated) is the frequency Hn shown in FIG. Change the set frequency to the lower frequency Hm. In the next pump rotation speed increase control operation, if there is no change in the set circulation flow rate Qs determined by the operation of the circulation flow rate setting operation means 44, the circulation pump 23 is rotated after the set high rotation duration time T2 has elapsed. It is possible to rotate the rotation frequency as the frequency Hm instead of the set frequency Hs, and then appropriately perform the pump rotation speed increasing operation. If it does in this way, the abnormality detection time of a circulation related element can be shortened.

  Furthermore, since the viscosity of the liquid containing water also changes depending on the temperature factor due to the season, for example, when the temperature of the liquid is low in winter, the difference between the detected circulation flow rate Qt and the set circulation flow rate Qs is less than the allowable flow rate. The number of rotations of the circulation pump 23 (that is, the frequency at this time) may be larger than when the temperature of the liquid is high. Therefore, the change of the set frequency as described above may be performed in order to cope with a case where the change is due to a seasonal factor, and in consideration of this, after the change of the set frequency, You may provide the structure of the setting frequency variable means etc. which can be returned to the original value, or can be changed into another value.

  Further, even if there is no abnormality in the water solenoid valve 24 and the circulation pump 23, for example, if the pipe is installed abnormally long, for example, if the pipe as a liquid feeding passage is bent, the abnormality related to the circulation related element is detected. Anomalies may be detected when mode operations are performed. Therefore, for example, at the time of the first notification of the abnormality of the circulation-related element, as a precaution, it is confirmed whether there is any cramping of the pipe, and after that, measures such as checking the water electromagnetic valve 24 and the circulation pump 23 are taken. You may perform the alerting | reporting to urge.

  Then, when the abnormality notification of the circulation-related element is performed for the second time or later, if the abnormality of the water electromagnetic valve 24 or the circulation pump 23 is notified without issuing the confirmation message of the piping abnormality, for example, the abnormality notification of the circulation-related element is notified during the trial operation. If it is done, it is possible to determine whether the construction is out of the design range, for example, the piping is abnormally long or cramped, by confirming that the pipe has been buckled. When it is confirmed that there is no abnormality in the piping by the contractor and an abnormality in the circulation-related element is notified in the subsequent use, for example, an abnormality such as an abnormality in the water electromagnetic valve 24 or damage to the circulation pump 23 occurs. The user can determine that the maintenance has been improved.

  In any case, hot water circulation through the hot water circulation passage 40 can always be appropriately performed by taking action against each abnormality by the operation of the circulation related element abnormality detection mode and notification of the circulation related element abnormality. Therefore, even if the tank unit 4 and the water heater 16 are separated from each other in a cold region, it is possible to prevent the hot water circulation passage 40 from freezing in the winter. The operation of the hot water additional heating function introduced into the hot water heater 16 through the passage between the connection portion with the passage 9 and the hot water heater 16 can be performed without any trouble.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, in the embodiment, the control means 37 in the circulation-related element abnormality detection mode is set to correspond to the set circulation flow rate Qs after the set high rotation duration time (T2) in the function of the circulation-related element abnormality detection mode. When the circulating pump 23 is rotated at the rotational speed and the detected circulating flow rate Qt detected by the flow rate detecting means 42 is smaller than the set circulating flow rate Qs, the rotational speed of the circulating pump 23 is increased stepwise. Although the pump rotation speed up control operation is performed, the rotation speed of the circulation pump 23 is not increased stepwise during the pump rotation speed increase control operation, but continuously increased (the rotation of the circulation pump 23). The frequency of the number control may be increased continuously).

  Further, the circulation-related element abnormality detection mode control means 37 is configured so that, in the function of the circulation-related element abnormality detection mode, the circulation pump 23 at a set rotational speed corresponding to the set circulation flow rate after the elapse of the set high rotation duration (T2). When the detected circulating flow rate Qt detected by the flow rate detecting means 42 is larger than the set circulating flow rate Qs, the rotational speed of the circulating pump 23 is decreased stepwise or continuously (rotation of the circulating pump 23). The pump rotation speed down control operation may be performed in which the frequency of the number control is decreased stepwise or continuously. When the rotational speed of the circulating pump 23 reaches a predetermined lower limit before the difference between the set circulating flow rate Qs and the detected circulating flow rate Qt becomes equal to or less than a predetermined allowable flow rate by the pump rotational speed down control operation. (For example, when the rotational frequency of the circulation pump 23 reaches 77 Hz), the water electromagnetic valve 24 is closed and a series of operations from the initial operation to the pump rotation speed down control operation may be repeated. Good. In this case as well, the lower limit value may be a value within a predetermined range, for example, a value within a range between 77 Hz and 82 Hz.

  In this way, when the control unit 37 in the circulation related element abnormality detection mode also performs the pump rotation speed down control operation in the function of the circulation related element abnormality detection mode, the circulation related element abnormality determination means 38 When the number of repetitions of the series of operations reaches a predetermined number of times, the abnormality of the circulation related element is determined, and when the abnormality of the circulation related element is determined by the circulation related element abnormality determination means 38 Then, the circulation-related element abnormality notification means 41 is notified.

  Furthermore, in the above-described embodiment, the water electromagnetic valve 24 is a pilot type electromagnetic valve, but the water electromagnetic valve 24 may be an electromagnetic valve other than the pilot type.

  Furthermore, in the said Example, although the hot water tank 2 was thermally connected to the fuel cell 1, you may connect the heat collector etc. which collect solar heat instead of the fuel cell 1. FIG.

  Furthermore, the detailed system configuration of the heat source device of the present invention is set as appropriate, and has a hot water tank 2, a hot water passage 9, and a hot water circulation passage 40. The hot water circulation passage 40 includes a water circulation pump 23, a water electromagnetic The valve 24, the hot water heater (auxiliary heat source device) 16, and the flow rate detecting means 42 are provided, and are appropriately formed so that the operation of the additional heating function and the operation of the circulating hot water heating function by the hot water heater 16 can be performed. For example, the hot water heater 16 may be a hot water heater of a type that heats the hot water heat exchanger 17 by, for example, an oil combustion type burner device, or may be a hot water heater of a type that is heated by an electric heater.

  Furthermore, the present invention has substantially the same configuration as the abnormality detection configuration of the circulation-related elements provided in the hot water circulation passage 40 and the hot water circulation passage 40 (see FIG. 1) provided in the heat source device of the above embodiment. A liquid supply pump for supplying liquid to the liquid supply passage, an open / close valve for switching presence / absence of liquid supply by driving the liquid supply pump by opening / closing the valve, and a liquid supply pump through the liquid supply passage. The present invention is also applied to a liquid feeding device provided with a flow rate detecting means for detecting a flow rate.

  In this case, the liquid delivery device includes the initial operation for rotating the liquid delivery pump at a preset high rotational speed with the on-off valve closed, and after the predetermined preliminary rotation time has elapsed. Open the on-off valve, and after a predetermined high set rotation time elapses, rotate the liquid feed pump at a set rotational speed corresponding to a predetermined set flow rate, and the flow rate detecting means during rotation of the liquid feed pump When the difference between the detected flow rate detected by the flow rate and the set flow rate is outside the predetermined allowable flow rate range, an abnormality in the liquid supply related element for determining an abnormality in at least one of the liquid supply related elements of the on-off valve and the liquid supply pump Judgment means is provided. Then, when the abnormality related to the liquid feeding related element is judged by the liquid feeding related element abnormality judging means, the liquid feeding related element abnormality notifying means for notifying the abnormality of the liquid feeding related element is provided. The liquid fed by the liquid feeding device may be a liquid other than water or a liquid that is not heated. In this case, a heating means such as the water heater 16 provided in the above embodiment can be omitted.

  The heat source device of the present invention connects the hot water circulation passage and the auxiliary heat source device to the hot water discharge passage of the hot water tank, and can easily detect an abnormality of the water electromagnetic valve provided in the hot water circulation passage. Correspondingly, hot water that circulates in the hot water circulation passage is heated by the auxiliary heat source device to appropriately prevent freezing of hot water in the hot water circulation passage, and can be used as, for example, a household heat source device.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Hot water storage tank 3 Heat recovery passage 4 Tank unit 5 Hot water temperature detection means 6 in a hot water tank 6 Three-way valve 7 Bypass passage 8, 8a, 8b Water supply passage 9 Hot water discharge passage 10 Junction part 11 Mixer 13 Tank solenoid valve 14 Water mixer 15 Hot water introduction passage 16 Water heater 17 Hot water heat exchanger 23 Circulation pump 24 Solenoid valve 26 FC high temperature thermistor 27 FC low temperature thermistor 28 Mixed thermistor 33 Controller 37 Circulation related element abnormality detection mode Control means 38 Circulation related element abnormality determination means 39 Remote control device 40 Hot water circulation passage 41 Circulation related element abnormality notification means 42 Flow rate detection means 57 Circulation flow control means

Claims (3)

  A liquid-feeding passage having a function of feeding a liquid through the passage, and the liquid-feeding passage includes a liquid-feeding pump for feeding the liquid to the liquid-feeding passage by rotational driving, and a liquid-feeding pump An on-off valve that switches the presence / absence of liquid feeding by driving by opening / closing a valve and a flow rate detecting means for detecting a flow rate of liquid sent through the liquid feeding passage are provided, and the liquid feeding is performed with the on-off valve closed. After the initial operation of rotating the pump at a predetermined high rotation speed, the on-off valve is opened after a predetermined preliminary rotation time has elapsed, and the predetermined setting is performed after the predetermined high rotation duration has elapsed. The liquid delivery pump is rotated at a set rotational speed corresponding to the flow rate, and the difference between the detected flow rate detected by the flow rate detecting means and the set flow rate is outside a predetermined allowable flow rate range when the liquid delivery pump is rotated. When A liquid-feeding-related element abnormality judging means for judging an abnormality of at least one liquid-feeding related element of the on-off valve and the liquid-feeding pump, and the liquid-feeding related element abnormality judging means judges whether the liquid-feeding related element abnormality is abnormal A liquid feeding device comprising: a liquid feeding related element abnormality notifying means for notifying the abnormality of the liquid feeding related element when it is done.   A main heat source device having a hot water storage tank and having a function of supplying hot water from the hot water storage tank through a hot water outlet passage, and a hot water supply side of the hot water supply passage of the main heat source device is provided outside the hot water tank The hot water circulation passage is connected to a circulation passage, and a circulating pump for circulating hot water in the hot water circulation passage by rotation driving, and whether or not water is circulated to the hot water circulation passage by rotation driving of the circulation pump are connected to the hot water circulation passage. A water solenoid valve that is switched by opening and closing; a flow rate detecting means for detecting a flow rate of water circulating through the hot water circulation passage; a circulating hot water heating function for heating hot water circulating through the hot water circulation passage by a heating means; and the main heat source device An auxiliary heat source device having a heating function for heating the hot water introduced through the hot water passage and the hot water circulation passage by the heating means, and the water electromagnetic valve and the In order to detect an abnormality in at least one circulation-related element of the ring pump, a predetermined preliminary rotation after an initial operation of rotating the circulation pump at a predetermined set high speed with the water electromagnetic valve closed. After the elapse of time, the water solenoid valve is opened, and after the preset high rotation continuation time has elapsed, the circulating pump is rotated at a set rotational speed corresponding to a preset circulating flow rate, and the circulating pump is rotated. When the detected circulation flow rate detected by the flow rate detection means is smaller than the set circulation flow rate, a pump rotation speed up control operation is performed to increase the rotation speed of the circulation pump stepwise or continuously, and the pump rotation speed is increased. Before the difference between the set circulating flow rate and the detected circulating flow rate becomes equal to or less than a predetermined allowable flow rate by the up control operation, the rotation speed of the circulating pump is set in advance. A circulation-related element abnormality detection mode control unit that repeats a series of operations from the initial operation to the rotation speed increase control operation by closing the water solenoid valve when the set upper limit value is reached, and the circulation-related element abnormality detection Circulation-related element abnormality determination means for determining abnormality of the circulation-related element when the number of repetitions of the mode operation reaches a predetermined set number of times, and abnormality of the circulation-related element is determined by the circulation-related element abnormality determination means And a circulation-related element abnormality notifying means for notifying abnormality of the circulation-related element when the heat source device is operated.   3. The heat source device according to claim 1, wherein the water solenoid valve is a pilot-type solenoid valve.

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