JP2019049370A - Heat source system - Google Patents

Abstract

To provide a heat source system capable of easily detecting generation of clogging in a circulation flow passage caused by freezing or the like without requiring a flow sensor.SOLUTION: A heat source system 1 includes: a first temperature sensor 12b disposed around a pump 11; a second temperature sensor 12a disposed at a portion away from the pump 11 further than the first temperature sensor 12b; and a clogging detection section 20a detecting generation of clogging in a circulation flow passage 10. In a state where a heating source 3 is not operated and the pump 11 is operated, the clogging detection section 20a detects the generation of clogging in the circulation flow passage 10 on the basis of a temperature difference between a temperature detected by the first temperature sensor 12b and a temperature detected by the second temperature sensor 12a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat source system such as a boiler apparatus.

  Conventionally, for example, as disclosed in Patent Document 1, in a hot water supply heater which heats with a heating heat exchanger while circulating hot water for heating in a circulation flow path by a pump, freezing of hot water is prevented from occurring. It is known that, when the outside air temperature is lower than a predetermined temperature, the pump is forcibly operated to circulate the hot water through the circulation flow passage and to operate the heating heat exchanger.

Japanese Patent Application Laid-Open No. 9-318085

  However, in the conventional system as disclosed in Patent Document 1, when the outside air temperature detected by the temperature sensor tends to be higher than the actual temperature around the circulation channel, or in the circulation channel, When the actual ambient temperature becomes low enough to prematurely advance the freezing of the hot water in the circulation channel, the freezing of the hot water in the circulation channel is already started when the operation of the pump is started. As a result, it is also possible that clogging of the circulation channel has occurred.

  In this case, even if the pump is operated, the circulation of the hot water in the circulation flow path is not performed, so when the hot water is heated by the heating heat exchanger, the hot water in the heating heat exchanger boils rapidly. There is a possibility that inconveniences such as damage to the heating heat exchanger may occur.

  Therefore, when clogging of the circulation flow channel occurs due to freezing or the like of the hot water in the circulation flow channel, it is desirable to be able to detect that.

  Here, for example, when a flow rate sensor capable of detecting the flow rate of hot water in the circulation flow path is provided in the circulation flow path, clogging is observed by observing the output of the flow rate sensor in a state where the pump is operated. It is possible to detect the presence or absence of the occurrence of

  However, when a flow rate sensor is provided in the circulation flow path, energy loss is likely to occur during circulation of hot water, and thus, in many cases, such a flow rate sensor is not provided in a heat source system such as a boiler apparatus.

  Also, mounting a flow rate sensor in the circulation channel of the heat source system is disadvantageous in terms of the energy efficiency of the heat source system or the product cost.

  The present invention has been made in view of the above background, and it is an object of the present invention to provide a heat source system capable of easily detecting the occurrence of clogging of the circulation flow passage due to freezing or the like without requiring a flow rate sensor. I assume.

In order to achieve the above object, the heat source system of the present invention circulates the heat medium between a heat source machine having a heat source for heating the heat medium, a supply target portion of the heat medium, and the heat source machine. A heat source system comprising: a circulation flow path connecting the supply target portion and the heat source machine to be obtained; and a pump for circulating the heat medium in the circulation flow path,
A first temperature sensor disposed around the pump;
A second temperature sensor disposed at a location farther from the pump than the first temperature sensor;
And clog detection means for detecting the occurrence of clogs in the circulation channel,
The first temperature sensor is affected by heat generation of the pump when the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited. Are disposed close to the pump such that the temperature detected by the first temperature sensor rises.
The second temperature sensor detects the second temperature sensor when the pump is operated without operating the heat source in a state in which the heat medium can normally flow in the circulation flow path. The pump is operated without operating the heat source in a state in which the temperature is maintained at a temperature equivalent to the temperature detected by the first temperature sensor and the flow of the heat medium in the circulation flow path is inhibited. The temperature detected by the second temperature sensor is located at a position not affected by the heat generation of the pump when the
The clogging detection means is a temperature difference between a temperature detected by the first temperature sensor and a temperature detected by the second temperature sensor in a state where the pump is operated without operating the heat source. The present invention is characterized in that it is configured to detect the occurrence of clogging in the circulation flow path based on the above (1st invention).

  In the present invention, “the state in which the flow of the heat medium in the circulation flow path is inhibited” means that the flow rate or flow velocity of the heat medium in the circulation flow path is zero even if the pump is operated. Alternatively, it means a state where it becomes almost zero (in other words, when the pump is operated, the flow of the heat medium in the circulation channel does not occur or hardly occurs).

  Further, “a temperature equivalent to the temperature detected by the first temperature sensor” means a temperature that matches or substantially matches the temperature detected by the first temperature sensor.

  Further, “the temperature detected by the second temperature sensor is not affected by the heat generation of the pump”, the heat generated by the pump is hardly transmitted to the location where the second temperature sensor is disposed, This means that the temperature detected by the second temperature sensor has little or no dependence on the heat generation of the pump.

  According to the first aspect of the invention, when the pump is operated without operating the heat source in a state where the heat medium can be normally circulated in the circulation flow path, the temperature difference is zero or zero. It will be kept close.

  On the other hand, when the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited, the temperature detected by the first temperature sensor and the second temperature sensor Among the temperatures detected by the temperature sensor, the temperature by the first temperature sensor close to the pump rises due to the heat generation of the pump, so the temperature difference becomes large to some extent.

  For this reason, the clogging detection means can appropriately detect the occurrence of clogging of the circulation channel based on the temperature difference.

  Therefore, according to the first aspect of the invention, the occurrence of clogging in the circulation flow passage due to freezing or the like can be easily detected without the need for a flow rate sensor.

  In the first aspect of the invention, the first temperature sensor is a forward temperature which is a temperature of the heat medium supplied from the heat source machine to the supply target portion in the circulation flow path, and the supply target portion in the circulation flow path. A temperature sensor assembled to the circulation flow path to detect one of the return temperature which is the temperature of the heat medium returning from the heat source machine to the heat source machine, the second temperature sensor being the forward temperature and It is preferable that the temperature sensor be assembled in the circulation channel so as to detect the other of the return temperatures (the second invention).

  Here, the heat source system is generally provided with a temperature sensor for detecting the forward temperature and the return temperature, respectively, for controlling the heating amount of the heat medium by the heat source. Further, the pump is a flow path on the side of supplying the heat medium from the heat source machine to the supply target portion among the circulation flow paths, and a flow path on the side of returning the heat medium from the supply target portion to the heat source machine Usually, one of the temperature sensors for detecting the forward temperature and the return temperature, respectively, is disposed closer to the pump than the other.

  Therefore, according to the second aspect of the present invention, the existing temperature sensor of the heat source system can be used, and the heat source system of the present invention can be realized inexpensively and easily.

  In addition, since the heat medium in the circulation flow path is confined in the pipe constituting the circulation flow path, the temperature of the heat medium detected by the first temperature sensor and the temperature of the heat medium respectively Temperature or return temperature) is highly stable. Therefore, it is possible to enhance the reliability of detecting the occurrence of clogging in the circulation flow channel based on the temperature difference.

  In the first or second aspect of the invention, the clogging detection means may, for example, set the temperature difference when a predetermined time has elapsed since the start of operating the pump without operating the heat source. According to the third aspect of the present invention, the occurrence of clogging in the circulation flow path can be detected by comparison with the threshold value of the second aspect.

  According to this, when clogging of the circulation flow path occurs, the temperature detected by the first temperature sensor is sufficiently increased by the influence of heat generation of the pump, based on the temperature difference at the stage, Since the occurrence of clogging in the circulation channel can be detected, the reliability of the detection can be enhanced.

Further, the heat source system of the present invention can adopt the following aspects. That is, the heat source unit having the heat source for heating the heat medium, and the heat source unit are connected so that the heat medium can be circulated between the heat medium supply target portion of the heat medium and the heat source unit. A heat source system comprising: a circulation flow passage, and a pump for circulating the heat medium in the circulation flow passage,
A first temperature sensor disposed around the pump;
And clog detection means for detecting the occurrence of clogs in the circulation channel,
The first temperature sensor is affected by heat generation of the pump when the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited. Are disposed close to the pump such that the temperature detected by the first temperature sensor rises.
The clogging detection means detects the clogging of the circulation flow passage based on a change in temperature detected by the first temperature sensor in a state where the pump is operated without operating the heating source. The present invention is characterized in that it is configured to

  In the present invention, the meaning of "a state in which the flow of the heat medium in the circulation channel is inhibited" is the same as in the first invention.

  When the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited, the temperature detected by the first temperature sensor is the heat generation of the pump Rise by the influence of

  On the other hand, when the pump is operated without operating the heat source in a state where the heat medium can be normally circulated in the circulation flow path, much of the heat generated by the pump is a circulating flow. The temperature detected by the first temperature sensor is hardly influenced by the heat generation of the pump because it is conveyed by the heat medium flowing in the passage. As a result, the temperature detected by the first temperature sensor does not rise as in the case where the flow of the heat medium in the circulation flow path is inhibited.

  For this reason, the clogging detection means can appropriately detect the occurrence of clogging of the circulation flow path based on the change in temperature detected by the first temperature sensor.

  Therefore, according to the fourth aspect of the present invention, as in the first aspect of the present invention, the occurrence of clogging in the circulation flow path due to freezing or the like can be easily detected without the need for a flow rate sensor.

  In the fourth aspect of the invention, the first temperature sensor is a forward temperature, which is a temperature of the heat medium supplied from the heat source machine to the supply target portion in the circulation flow path, and the supply target portion in the circulation flow path. It is preferable that the temperature sensor be assembled to the circulation flow path so as to detect one of the return temperature which is the temperature of the heat medium returning from the heat source machine to the heat source machine (the fifth invention).

  According to this, as with the second invention, the existing temperature sensor of the heat source system can be used, and the heat source system of the present invention can be realized inexpensively and easily.

  Further, since the temperature of the heat medium detected by the first temperature sensor has high stability, it is possible to improve the reliability of detecting the occurrence of the clogging of the circulation channel based on the change of the temperature.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the whole structure of the heat-source system of one Embodiment of this invention. The flowchart which shows the control processing by the control apparatus of the heat-source system of embodiment. The flowchart which shows the control processing by the control apparatus of the heat-source system of embodiment. The graph which shows the example of a time-dependent change of the temperature detected by the temperature sensor of the heat source system of embodiment.

  One embodiment of the present invention will be described below with reference to FIGS. The heat source system 1 according to the present embodiment is, for example, a boiler apparatus, and can circulate warm water as a heat medium between the heat source unit 2 as a main body and the heat source unit 2 and a radiator H such as a heating unit. Thus, the circulation flow path 10 connecting the heat source unit 2 and the radiator H is provided. The radiator H is an example of a supply target portion of a heat medium (hot water).

  The heat source unit 2 is equipped with a combustion chamber 5 in which the burner 3 and the heat exchanger 4 are accommodated, and a fuel supply passage 6 for supplying the burner 3 with fuel gas. A combustion fan 7 for supplying combustion air to the burner 3 is attached to the air supply port 5 a of the combustion chamber 5, and an exhaust path 8 for leading the combustion exhaust gas to the outside of the heat source unit 2 is attached to the exhaust port 5 b of the combustion chamber 5. Is connected.

  The upstream side of the fuel supply passage 6 is connected to a pipe of a fuel supply source (not shown) outside the heat source unit 2. Further, the fuel supply passage 6 is provided with solenoid valves 6a and 6b for opening and closing the fuel supply passage 6, and a fuel flow control valve 6c such as a proportional valve for adjusting the supply amount (flow rate) of fuel gas to the burner 3 ing.

  The burner 3 is a heating source of hot water (heat medium) circulated in the circulation flow path 10. The burner 3 operates the combustion fan 7 at a predetermined rotational speed, opens the solenoid valves 6a and 6b, and controls the opening degree of the fuel flow control valve 6c to a predetermined opening degree. It is ignited by driving an igniter (not shown). During the combustion operation of the burner 3, the amount of fuel gas supplied to the burner 3 is controlled via the fuel flow control valve 6 c, and the amount of air supplied for combustion to the burner 3 is supplied via the combustion fan 7. By controlling it, it is possible to variably control the amount of combustion of the burner 3.

  The burner 3 is not limited to the burner that burns the fuel gas, but may be a burner that burns liquid fuel such as kerosene.

  The heat exchanger 4 is a heat exchanger that transfers the heat of combustion of the burner 3 to the hot water to heat the hot water circulated in the circulation flow passage 10, and the heat is burned by the heat of combustion of the burner 3. It is disposed in the chamber 5 and interposed in the middle of the circulation channel 10.

  The circulation flow path 10 includes a forward flow path 10a for flowing warm water from the heat exchanger 4 to the radiator H, and a return flow path 10b for flowing warm water from the radiator H to the heat exchanger 4. Then, a pump 11 for circulating warm water in the circulation flow path 10 is interposed in one of the forward path side flow path 10a and the return path side flow path 10b, for example, in the return path side flow path 10b inside the heat source device 2. .

  In addition, the temperature sensor 12a for detecting the temperature of the hot water supplied from the heat exchanger 4 to the radiator H in the circulation flow path 10 (hereinafter referred to as the coming temperature), and the radiator H return to the heat exchanger 4 A temperature sensor 12 b for detecting the temperature of the hot water (hereinafter referred to as return temperature) is assembled inside the heat source unit 2 in each of the forward passage 10 a and the return passage 10 b. Hereinafter, the temperature sensor 12a may be referred to as an outward temperature sensor 12a, and the temperature sensor 12b may be referred to as a homeward temperature sensor 12b.

  Here, in the present embodiment, among the temperature sensors 12a and 12b, the forward path temperature sensor 12a corresponds to a second temperature sensor in the present invention, and the return path temperature sensor 12b corresponds to a first temperature sensor in the present invention It is.

  More specifically, in the present embodiment, the return path temperature sensor 12b (first temperature sensor), which is a temperature sensor assembled in the flow path on the same side as the pump 11 (in the present embodiment, the return path flow path 10b) It is disposed at a location near the pump 11 around the pump 11 (in the illustrated example, at a location close to the pump 11 on the outlet side of the pump 11).

  In the present embodiment, the return path temperature sensor 12b disposed near the pump 11 is disposed on the discharge port side (downstream side) of the pump 11, but the suction port side (upstream side) of the pump 11 It may be arranged in

  Further, in a state in which the circulation of the hot water in the circulation flow passage 10 is inhibited by the clogging of the circulation flow passage 10 caused by the freezing or the like of the warm water in the circulation flow passage 10 (hereinafter referred to as the hot water circulation inhibition state) When the pump 11 is operated without performing the combustion operation 3 (without heating the hot water in the heat exchanger 4), the flow rate of the hot water in the circulation flow path 10 becomes zero or almost zero. Thus, the heat generated by the pump 11 is not transported or hardly transported by the warm water in the circulation flow passage 10 by the operation of the pump 11. As a result, the return temperature detected by the return path temperature sensor 12b disposed near the pump 11 is the temperature of the hot water remaining in the circulation flow path 10 at the location where the return path temperature sensor 12b is disposed. Significantly affected by the heat generated by

  For this reason, when the pump 11 is operated without performing the combustion operation of the burner 3 in the hot water circulation inhibition state, the return temperature detected by the return path side temperature sensor 12b disposed near the pump 11 After the start of the operation of the pump 11, it rises under the influence of the heat generation of the pump 11.

  For example, the upper graph in FIG. 4 shows the hot water circulation inhibition state (specifically, the outside temperature is −10 ° C., and the temperature of the hot water in the circulation flow path 10 is 20 ° C. In the hot water circulation inhibition state), when the pump 11 is operated without performing the combustion operation of the burner 3, an example of the temporal change of the return temperature actually detected by the return path side temperature sensor 12b is shown. As illustrated, the return temperature detected by the return side temperature sensor 12b is affected by the heat generation of the pump 11 (the heat generated by the pump 11 is transferred to the return side temperature sensor 12b) to operate the pump 11 It will rise significantly after the start of the

  On the other hand, the forward path temperature sensor 12a (second temperature sensor) assembled to the forward path flow passage 10a is disposed at a position sufficiently away from the pump 11 than the return path temperature sensor 12b. Therefore, when the pump 11 is operated without performing the combustion operation of the burner 3 in the hot water circulation inhibition state, the outward path temperature sensor 12a is hardly affected by the heat generation of the pump 11 (pump 11 The heat generated in (5) is hardly transmitted to the location of the forward side temperature sensor 12a).

  For this reason, when the pump 11 is operated without performing the combustion operation of the burner 3 in the hot water circulation inhibition state, the forward temperature detected by the forward temperature sensor 12a (circulation at the location where the forward temperature sensor 12a is disposed) The temperature of the hot water remaining in the flow path 10 does not cause the temperature rise corresponding to the heat generation of the pump 11.

  For example, the lower graph in FIG. 4 shows that the warm water circulation inhibition state (specifically, the outside temperature is −10 ° C., and the temperature of the warm water in the circulation flow path 10 is 20 ° C.) In the hot water circulation inhibition state, when the pump 11 is operated without performing the combustion operation of the burner 3, an example of the temporal change of the forward temperature actually detected by the forward path temperature sensor 12 a is shown. As shown in the figure, the going temperature detected by the going side temperature sensor 12 a is such that the temperature rise due to the heat generation of the pump 11 does not occur. In this case, in the example shown in FIG. 4, since the outside air temperature (-10.degree. C.) is lower than the temperature (20.degree. C.) of the hot water at the start of operation of the pump 11, the going temperature detected by the going side temperature sensor 12a gradually It has fallen to

  In the steady state in which the combustion operation of the burner 3 and the operation of the pump 11 are stopped, the forward temperature detected by the forward temperature sensor 12a and the return temperature detected by the return temperature sensor 12b are the heat source unit 2 Converges to a temperature that matches or nearly matches the ambient temperature around the.

  Further, when the pump 11 is operated without performing the combustion operation of the burner 3 in a state where there is no clogging of the circulation flow passage 10 and circulation of hot water in the circulation flow passage 10 can be normally performed, circulation is performed. Since the hot water in the flow path 10 is continuously heated without being heated, the forward temperature detected by the forward temperature sensor 12a and the return temperature detected by the backward temperature sensor 12b coincide with each other. Alternatively, the temperature is maintained at almost the same temperature.

  Returning to FIG. 1, the heat source system 1 (boiler apparatus) of the present embodiment further includes a control device 20 that performs operation control of the heat source unit 2 and a remote control 21 for performing various operation operations of the heat source system 1. Have.

  The remote control 21 is configured to be able to perform operation operations such as start or stop of operation of the heat source system 1, setting of a target temperature of hot water supplied to the radiator H, setting of an operation mode of the heat source system 1, etc. The operation unit 21a includes a plurality of operation switches and the like for performing the driving operation, and a display 21b that displays various information.

  The remote control 21 is connected by wire to the control device 20 so as to be able to communicate with the control device 20 mutually. The communication method between the remote control 21 and the control device 20 is not limited to wired communication, and wireless communication by Wi-Fi (registered trademark), Bluetooth (registered trademark) or the like may be used.

  The control device 20 is configured by an electronic circuit unit including a microcomputer, a memory, an interface circuit, and the like. Detection signals of the forward path side temperature sensor 12 a and the return path side temperature sensor 12 b are input to the control device 20.

  The control device 20 has the functions of the solenoid valves 6a and 6b, the fuel flow control valve 6c, the combustion fan 7, and the igniter (not shown) as functions implemented by the implemented hardware configuration and program (software configuration). In addition to having the function of controlling the combustion operation of the burner 3 through operation control and the function of controlling the operation of the pump 11, it also includes a function as a clogging detection unit 20a that detects clogging of the circulation flow path 10. The clogging detection unit 20a is a functional unit corresponding to the clogging detection unit in the present invention.

  In the present embodiment, the clogging detected by the clogging detection unit 20a is a clogging of the circulation flow passage 10 caused by the freezing of the hot water in the circulation flow passage 10. Therefore, the clogging detection unit 20a has a function as a freezing detection unit that detects freezing of the hot water in the circulation flow passage 10, in other words.

  Next, the operation of the heat source system 1 regarding the detection (freezing detection) of the clogging by the clogging detection unit 20a will be described.

  In the present embodiment, the control device 20 executes a process for preventing the freezing of the hot water in the circulation flow path 10 (hereinafter referred to as a freeze prevention process) or at the start of the heat source system 1 (immediately after the power is turned on). The processing of the clogging detection unit 20a is executed in

  The freeze prevention process is performed when the combustion operation of the burner 3 and the operation of the pump 11 are stopped in the state where the heat source system 1 is activated (the state where the power supply power is applied to the heat source system 1). As shown in the flowchart of FIG.

  In STEP 1, the control device 20 determines whether the current going temperature detected by the going side temperature sensor 12 a is lower than a predetermined temperature T 1 (for example, 4 ° C.). The situation where the judgment result is negative is a situation where the going temperature is a temperature above the predetermined temperature T1 (4 ° C.), so it is not a situation where freezing of the hot water in the circulation flow path 10 occurs. It can be regarded as.

  Therefore, when the determination result of STEP1 is negative, the control device 20 sequentially repeats the determination process of STEP1.

  In winter and the like, the determination result of STEP 1 may be positive. In this case, there is a possibility that freezing of the hot water may occur at any place in the circulation flow path 10 or freezing may occur in the near future, so the control device 20 next generates the freezing. Execute the processing from STEP 2 to prevent it.

  In STEP 2, the controller 20 starts the operation of the pump 11. At this time, if the hot water can flow in the circulation flow path 10, the circulation of the hot water in the circulation flow path 10 is started.

  Next, in STEP 3, the control device 20 sequentially executes a process of determining whether a predetermined time (for example, 5 minutes) has elapsed after the start of operation of the pump 11, and when the predetermined time elapses (determination in STEP 3 If the result is affirmative), then the determination process of STEP 4 is executed. The determination process of STEP 4 is a process performed by the clogging detection unit 20 a in order to detect the occurrence of freezing (specifically, the clogging of the circulation flow passage 10 caused by the occurrence of freezing).

  Specifically, in STEP 4, the clogging detection unit 20 a acquires detection values of the current forward temperature and the return temperature respectively detected by the forward path temperature sensor 12 a and the return path temperature sensor 12 b. Then, it is determined whether the temperature difference between the detection value of the return temperature and the detection value of the going temperature (= the return temperature−the going temperature) is larger than a predetermined threshold value T2 (for example, 10 ° C.).

  Here, since the state where freezing of the hot water in the circulation flow path 10 is occurring is the hot water circulation inhibition state, the return path temperature sensor near the pump 11 is affected by the heat generation of the pump 11 as described above. While the return temperature detected by 12b rises, the forward temperature detected by the forward path side temperature sensor 12a separated from the pump 11 does not raise the temperature due to the heat generation of the pump 11.

  Further, in a situation where the determination result of the STEP 1 becomes affirmative, the combustion operation of the burner 3 and the operation of the pump 11 are stopped steadily before that point, so the operation of the pump 11 was started in STEP 2 At this point, the temperature (going temperature) of the hot water in the circulation flow passage 10 at the placement location of the forward way side temperature sensor 12a and the temperature (return temperature) of the hot water in the circulation flow passage 10 at the placement location of the return way temperature sensor 12b And the temperature of the same as the ambient temperature around the heat source unit 2 (a temperature that matches or nearly matches the ambient temperature).

  Then, since the forward temperature detected by the forward side temperature sensor 12 a is not affected by heat generation after the start of operation of the pump 11, the forward temperature is the atmosphere around the heat source unit 2 after the start of operation of the pump 11. It is kept at the same temperature as the temperature.

  For this reason, when the circulation flow path 10 is in the hot water circulation inhibition state by the occurrence of freezing of the hot water in the circulation flow path 10, a predetermined time (5 minutes) after the start of operation of the pump 11 The above-mentioned temperature difference (= return temperature−forward temperature) at the time of elapse becomes a somewhat large value. As a result, the determination result of STEP 4 becomes positive. Thereby, generation | occurrence | production of freezing of the warm water in the circulation flow path 10 is detected.

  When the determination result of STEP 4 becomes affirmative (when the occurrence of freezing is detected) as described above, the control device 20 stops the operation of the pump 11 in STEP 5 and, further, in STEP 6, the freezing. The remote controller 21 is made to output an error notification that indicates that the occurrence of the has been detected. This error notification is visually performed, for example, on the display unit 21b of the remote control 21, or aurally performed using an alarm sound or a voice.

  Supplementally, when clogging of the circulation flow passage 10 occurs due to factors other than freezing (for example, when clogging occurs due to a foreign substance in the circulation flow passage 10 or a manual valve provided in the circulation flow passage 10 is a user) Also in the case where the valve is closed accidentally, etc.), the judgment result of STEP 4 becomes affirmative. Therefore, the error notification to be output in STEP 6 may indicate that clogging of the circulation flow passage 10 has occurred.

  When the operation of the pump 11 is started in a state where clogging of the circulation flow passage 10 due to freezing or the like does not occur, circulation of hot water in the circulation flow passage 10 is continuously performed, so The forward temperature detected by the side temperature sensor 12a and the return temperature detected by the return side temperature sensor 12b are equal to each other. As a result, the determination result of STEP 4 becomes negative.

  In this case, the controller 20 next determines in STEP 7 whether or not the current going temperature detected by the forward path temperature sensor 12a is lower than a predetermined temperature T3 (for example, 2 ° C.).

  In a situation where the determination result of STEP 7 is affirmative, there is a possibility that freezing of the hot water in the circulation flow path 10 may proceed. Therefore, when the determination result in STEP 7 is affirmative, the control device 20 starts the combustion operation of the burner 3 while continuing the operation of the pump 11 in STEP 8, and executes the combustion operation for a predetermined time. Do.

  Then, after the completion of the combustion operation of the burner 3 in STEP 8, the control device 20 performs a predetermined temperature T4 in STEP 9 at which the current going temperature detected by the outward temperature sensor 12a is higher than the predetermined temperature T3 in STEP 7. It is determined whether a temperature above (e.g. 3.5 [deg.] C.) has been reached.

  When the circulation of the hot water in the circulation flow passage 10 and the combustion operation of the burner 3 in STEP 8 are normally performed, the determination result in STEP 9 becomes affirmative, but in the other case, the determination in STEP 9 The result is negative.

  Therefore, when the determination result in STEP 9 becomes negative, the control device 20 stops the operation of the pump 11 in STEP 10, and further, in STEP 11, controls the error notification indicating that the occurrence of abnormality is detected. Make it output to 21. This error notification is performed in the same manner as STEP6.

  In addition, if the determination result in STEP 7 is negative or the determination result in STEP 9 is affirmative, in STEP 12, the control device 20 detects the current going temperature detected by the forward side temperature sensor 12 a. Is determined to be lower than a predetermined temperature T5 (for example, 10.degree. C.). Then, if the determination result in STEP 12 is affirmative, the control device 20 continues the operation of the pump 11 in order to ensure that future occurrence of freezing in the circulation flow path 10 can be prevented. Continue and repeat the process from STEP7.

  In addition, when the determination result in STEP 12 is negative, the temperature of the hot water in the circulation flow path 10 is not so low, and it can be considered that there is no possibility that the hot water will be frozen early. After stopping the operation of the pump 11 in STEP13, the process from STEP1 is resumed.

  The above is the control process executed by the control device 20 when the combustion operation of the burner 3 and the operation of the pump 11 are stopped in the state where the heat source system 1 is activated.

  Next, at the time of activation of the heat source system 1 (immediately after power on), control processing executed by the control device 20 will be described. The control process is performed as shown in the flowchart of FIG.

  In this case, in STEP 21, the control device 20 determines whether the current going temperature detected by the forward side temperature sensor 12a is lower than a predetermined temperature T11 (for example, 1 ° C.). If the determination result is affirmative, the controller 20 operates the pump 11 for a predetermined time (for example, 20 seconds) without performing the combustion operation of the burner 3 in STEP22.

  Then, after stopping the operation of the pump 11 in STEP22, the controller 20 determines in STEP23 whether the current going temperature detected by the forward side temperature sensor 12a is lower than a predetermined temperature T12 (for example, 2 ° C.) Decide whether or not. The determination process of STEP23 is a process executed by the clogging detection unit 20a together with the determination process of STEP27 described later.

  If the determination result of STEP 23 is affirmative, there is a high possibility that freezing of the hot water in the circulation flow path 10 has occurred. Therefore, in this case, the control device 20 causes the remote control 21 to output an error notification indicating that the occurrence of freezing has been detected in STEP24. This error notification is performed in the same manner as STEP 6 in FIG.

  If the determination result in STEP23 is negative, then in STEP26, the control device 20 operates the pump 11 for a predetermined time (for example, 5 minutes) without performing the combustion operation of the burner 3. The predetermined time is longer than the operation time (20 seconds) of the pump 11 in STEP22.

  Then, after stopping the operation of the pump 11 in STEP 26, the control device 20 in STEP 27 determines the current return temperature detected by the return path temperature sensor 12b, and the current going temperature detected by the forward path temperature sensor 12a. The blockage detection unit 20a executes a process of determining whether the temperature difference (= return temperature−forward temperature) is larger than a predetermined threshold value T2 (for example, 10 ° C.). The threshold T2 is the same as the predetermined temperature in STEP 4 of FIG.

  The situation in which the determination result in STEP 27 is positive is similar to the situation in which the determination result in STEP 4 in FIG. 2 is affirmative, the clogging in the circulation channel 10 is caused by clogging in the circulation channel 10. Since the hot water circulation inhibition state occurs, the temperature rise of the return temperature detected by the return path side temperature sensor 12b is generated due to the heat generation of the pump 11.

  Therefore, when the determination result in STEP 27 becomes affirmative (when the occurrence of freezing is detected), the control device 20 remotely controls the error notification indicating that the occurrence of freezing is detected in STEP 24. Make it output to 21.

  If the determination result in STEP 27 is negative, the control device 20 ends the processing of the flowchart in FIG. 3 on the assumption that freezing of the hot water in the circulation flow passage 10 has not occurred.

  Further, when the determination result of the above-mentioned STEP21 is negative, the control device 20 further causes the current going temperature detected by the forward side temperature sensor 12a to be lower than the predetermined temperature T13 (for example, 4 ° C) in STEP25. It is determined whether or not

  And when the judgment result of this STEP25 is affirmation, since freezing of warm water in circulation channel 10 may have occurred, control device 20 performs processing from above-mentioned STEP26. Do. At this time, as described above, the processing of the clogging detection unit 20a (determination processing for detecting the occurrence of freezing) is executed in STEP 27.

  If the determination result in STEP 25 is negative, the control device 20 ends the processing of the flowchart in FIG. 3 on the assumption that freezing of the hot water in the circulation flow passage 10 has not occurred.

  The above is the control processing executed by the control device 20 at startup of the heat source system 1 (immediately after power on).

  When the determination result of STEP 21 is affirmative, for example, instead of executing the process of STEPs 22 and 23, the process from STEP 26 may be performed.

  Supplementally, in the control processing of FIG. 3, when clogging of the circulation flow passage 10 is generated due to a factor other than freezing (for example, when clogging is generated due to a foreign object in the circulation flow passage 10, or Also in the case where the provided manual valve is accidentally closed by the user, etc.), the determination result of STEP23 or STEP27 becomes affirmative. Therefore, the error notification output in STEP 24 may indicate that clogging of the circulation flow passage 10 has occurred.

  According to the embodiment described above, after the pump 11 is operated for a predetermined time (5 minutes) in a state where the combustion operation of the burner 3 is stopped, the temperature is detected by the return side temperature sensor 12b and the forward side temperature sensor 12a. By appropriately detecting the occurrence of clogging in the circulation flow path 10 (in the above embodiment, the occurrence of clogging mainly due to freezing) by comparing the return temperature, the forward temperature and the temperature difference with a predetermined threshold value T2. Can.

  In this case, the forward path side temperature sensor 12a and the return path side temperature sensor 12b are generally provided in the heat source system conventionally so as to control the amount of combustion of the burner 3 for heating the hot water. For this reason, without needing a new sensor such as a flow rate sensor for detecting the flow rate of hot water in the circulation flow path 10, it is possible to realize the clogging of the circulation flow path 10 inexpensively and easily.

  Also, in order to detect the occurrence of clogging in the circulation flow passage 10 due to freezing or the like, by using the temperature difference between the return temperature and the forward temperature which are respectively detected by the return side temperature sensor 12b and the forward side temperature sensor 12a. The temperature difference is unlikely to be affected by the fluctuation of the ambient temperature around the heat source unit 2. Therefore, the occurrence of clogging in the circulation flow passage 10 can be detected with high reliability.

  The present invention is not limited to the embodiment described above, and other embodiments can be adopted. Several other embodiments are described below.

  In the embodiment, the pump 11 is operated for a predetermined time (5 minutes) in a state where the combustion operation of the burner 3 is stopped, and then the return temperature and the return temperature respectively detected by the return side temperature sensor 12 b and the forward side temperature sensor 12 a By comparing the temperature difference with the temperature with a predetermined threshold T2, an example of detecting occurrence of clogging in the circulation flow path 10 has been exemplified.

  However, for example, on the basis of the increase rate (the increase amount per unit time) or the like of the temperature difference after starting the operation of the pump 11 in a state in which the combustion operation of the burner 3 is stopped It is also possible to detect the occurrence.

  Further, for example, when the pump 11 is operated in a state where the combustion operation of the burner 3 is stopped, the circulating flow is based on the change in the temperature (return temperature) detected by the return path side temperature sensor 12b near the pump 11. It is also possible to detect the occurrence of a blockage in the road 10.

  As an embodiment in this case, for example, the following embodiment can be adopted. That is, when the pump 11 is operated with the combustion operation of the burner 3 stopped, the rate of increase (the amount of increase per unit time) of the temperature detected by the return path temperature sensor 12b near the pump 11 is observed. The temperature is caused by the heat generation of the pump 11 when the increase rate continues to be a predetermined value or more for a predetermined time or longer, or when the average increase rate in a predetermined time period is a predetermined value or more. The occurrence of clogging in the circulation channel 10 is detected on the assumption that the pressure has risen.

  Moreover, in the said embodiment, what used the return way temperature sensor 12b and the forward way temperature sensor 12a as a 1st temperature sensor in this invention, and a 2nd temperature sensor, respectively was shown. However, for example, when the pump 11 is interposed in the forward path 10a and the forward temperature sensor 12a is closer than the return temperature sensor 12b, the forward temperature sensor 12a is a first temperature sensor, and the return temperature The sensor 12b may be used as a second temperature sensor. More specifically, when the pump 11 is operated in a state where the combustion operation of the burner 3 is stopped, the clogging of the circulation passage 10 is caused based on the temperature difference between the detection value of the going temperature and the detection value of the return temperature. The occurrence may be detected.

  Further, in this case, it is also possible to detect the occurrence of clogging in the circulation flow passage 10 based on the change of the forward temperature detected by the forward side temperature sensor 12a.

  Further, the temperature sensors that can be used as the first temperature sensor and the second temperature sensor in the present invention are not limited to the return path temperature sensor 12 b and the forward path temperature sensor 12 a. For example, when the heat source system 1 includes a temperature sensor that detects the temperature of the object around the pump 11 or the ambient temperature, the temperature sensor may be used as a first temperature sensor in the present invention. Furthermore, when the heat source system 1 has a temperature sensor that detects the temperature of the object or the ambient temperature at a location farther from the pump 11 than the first temperature sensor, the temperature sensor is used as a second temperature sensor in the present invention It can.

  Moreover, in the said embodiment, the heat source machine 2 which has the burner 3 (burning type heat source) was illustrated as a heat source machine. However, the heat source machine according to the present invention may be provided with an electrical heat source (including a heat pump heat source) or with both a combustion heat source and an electrical heat source. Good.

  Moreover, the heat source system 1 which uses warm water as a heat carrier was illustrated in the said embodiment. However, the heat medium in the present invention may be a heat medium other than warm water.

DESCRIPTION OF SYMBOLS 1 ... Heat source system, 2 ... Heat source machine, 3 ... Burner (heat source), 10 ... Circulation flow path, 11 ... Pump, 12b ... Temperature sensor (1st temperature sensor), 12a ... Temperature sensor (2nd temperature sensor), 20a ... a clogging detection unit (clogging detection means).

Claims (5)

A heat source machine having a heating source for heating the heat medium, and a circulation connecting the supply object section and the heat source machine so that the heat medium can be circulated between the heat medium supply target portion of the heat medium and the heat source machine. A heat source system comprising: a flow path; and a pump for circulating the heat medium in the circulation flow path, the heat source system comprising:
A first temperature sensor disposed around the pump;
A second temperature sensor disposed at a location farther from the pump than the first temperature sensor;
And clog detection means for detecting the occurrence of clogs in the circulation channel,
The first temperature sensor is affected by heat generation of the pump when the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited. Are disposed close to the pump such that the temperature detected by the first temperature sensor rises.
The second temperature sensor detects the second temperature sensor when the pump is operated without operating the heat source in a state in which the heat medium can normally flow in the circulation flow path. The pump is operated without operating the heat source in a state in which the temperature is maintained at a temperature equivalent to the temperature detected by the first temperature sensor and the flow of the heat medium in the circulation flow path is inhibited. The temperature detected by the second temperature sensor is located at a position not affected by the heat generation of the pump when the
The clogging detection means is a temperature difference between a temperature detected by the first temperature sensor and a temperature detected by the second temperature sensor in a state where the pump is operated without operating the heat source. A heat source system, which is configured to detect the occurrence of clogging of the circulation flow path based on. In the heat source system according to claim 1,
The first temperature sensor returns to the heat source machine from the supply target portion in the circulation flow path, which is the temperature of the heat medium supplied from the heat source machine to the supply target portion in the circulation flow path. It is a temperature sensor assembled in the circulation channel so as to detect one of the return temperature which is the temperature of the heat medium, and the second temperature sensor is the other of the forward temperature and the return temperature. A heat source system characterized in that it is a temperature sensor assembled in the circulation channel so as to detect. In the heat source system according to claim 1 or 2,
The clogging detection means compares the temperature difference when a predetermined time has elapsed with a predetermined threshold value after starting to operate the pump without activating the heat source. A heat source system that is configured to detect the occurrence of a blockage in a road. A heat source machine having a heating source for heating the heat medium, and a circulation connecting the supply object section and the heat source machine so that the heat medium can be circulated between the heat medium supply target portion of the heat medium and the heat source machine. A heat source system comprising: a flow path; and a pump for circulating the heat medium in the circulation flow path, the heat source system comprising:
A first temperature sensor disposed around the pump;
And clog detection means for detecting the occurrence of clogs in the circulation channel,
The first temperature sensor is affected by heat generation of the pump when the pump is operated without operating the heat source in a state where the flow of the heat medium in the circulation flow path is inhibited. Are disposed close to the pump such that the temperature detected by the first temperature sensor rises.
The clogging detection means detects the clogging of the circulation flow passage based on a change in temperature detected by the first temperature sensor in a state where the pump is operated without operating the heating source. A heat source system characterized in that it is configured to: In the heat source system according to claim 4,
The first temperature sensor returns to the heat source machine from the supply target portion in the circulation flow path, which is the temperature of the heat medium supplied from the heat source machine to the supply target portion in the circulation flow path. What is claimed is: 1. A heat source system, comprising: a temperature sensor assembled in the circulation channel to detect one of a return temperature which is a temperature of the heat medium.