JP4904866B2 - Hot water heater / heat source machine - Google Patents

Description

  The present invention relates to a hot water supply / heating heat source machine, and more specifically, a heating medium heated by a heating unit is used for heating medium circulation heating, and a part of the heating medium is circulated to a primary side of a liquid-liquid heat exchanger. The present invention relates to a hot water supply / heating heat source device having a structure for heating general water by heating clean water.

  Conventionally, in a heating heat source machine having a semi-enclosed heating circulation circuit, when a liquid-liquid heat exchanger is used as a heat exchanger for heating, the primary side and the secondary side of the heat exchanger As a method for detecting a continuity abnormality, a method has been proposed in which a water level electrode is provided in a reserve tank and the continuity abnormality is detected by this water level electrode.

JP-A-5-118567

  By the way, the applicant of the present application newly uses a heat medium heated by one heating means for heat medium circulation heating, and a part of the plate type heat exchanger (liquid-liquid heat exchanger) with a circulation pump. We have devised a hot water supply heating heat source machine that realizes both the heating function and the general hot water supply function by circulating the primary side and heating the water on the secondary side of the plate heat exchanger. A method for detecting a conduction abnormality in a liquid-liquid heat exchanger for hot water supply has not been proposed.

  As described above, in a configuration in which a plate heat exchanger using a heating medium is used as a heat exchanger for general hot water supply, if the plate of the plate heat exchanger is broken due to cracking or the like, There is a possibility that water and the heating medium are mixed. That is, since antifreeze liquid is generally used as the heating medium for the heating, when it is used as a heat source for general hot water supply, water and antifreeze liquid are mixed due to breakage of the heat exchanger, and antifreeze liquid is mixed from a hot water tap etc. Hot water may come out.

  On the other hand, when it is attempted to detect the conduction abnormality of the heat exchanger with the electrode for detecting the water level as described above, if there is a large amount of heat medium in the reserve tank (if the liquid level in the tank is high), Since the water level electrode may detect the liquid level due to the thermal expansion of the heat medium during heating operation and erroneously detect a conduction error, replenishment of the heat medium to the reserve tank requires sufficient care. Since replenishment of the heating medium to the tank relies on the visual confirmation of the worker, there is a problem that it is difficult to completely prevent false detection.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a heat source device that uses a part of a heating medium for heating to heat clean water for general hot water supply. To provide a hot water supply / heating heat source machine that reliably detects a continuity abnormality between a primary side and a secondary side of a heat exchanger for general hot water supply with a simple configuration and does not cause hot water mixed with a heat medium to be discharged. is there.

In order to achieve the above object, in a hot water supply / heating heat source machine according to claim 1 of the present invention, a heating heat medium tank provided in a heating circulation circuit has a mounting portion for a pressure adjusting valve, and the pressure adjusting valve is provided in the mounting portion. In a heating heat source machine in which the pressure adjusting valve is connected to the reserve tank, a part of the heating heat medium heated by the heating means is circulated to the primary side of the liquid-liquid heat exchanger. A circulating circuit for hot water supply that heats the applied water using the supply water pressure on the secondary side to perform instantaneous general hot water supply, and a liquid level detection electrode of the heating heat medium is provided in the reserve tank together provided, the liquid on the basis of the detected state of the liquid level sensing electrode - conduction abnormality detecting means for detecting the conduction abnormality of the primary side and the secondary side of the liquid heat exchanger becomes in is provided, the liquid - liquid heat Hot water flow rate control downstream of the outlet side of the secondary side of the exchanger Is provided, when an abnormality is detected conduction by the conduction abnormality detecting means is characterized by comprising a control arrangement for the hot water supply flow rate control valve is fully closed.

That is, in this type of hot water heating / heating source, the primary side and secondary side of the liquid-liquid heat exchanger usually communicate with the water supply (the supply water pressure is applied) on the secondary side rather than the primary side. Water pressure is high. For this reason, if a continuity abnormality occurs between the primary side and the secondary side (short circuit between the temporary side and the secondary side), the water pressure in the heating circulation circuit increases, and the pressure regulating valve of the heating medium tank is activated accordingly. Thus, the heating medium flows into the reserve tank from the heating / heating medium tank side, and the liquid level in the reserve tank rises. The invention of claim 1 uses the liquid level detection electrode and the liquid level in the reserve tank by utilizing the characteristic of conduction abnormality between the primary side and the secondary side in such a liquid-liquid heat exchanger for general hot water supply. By monitoring the rise, the conduction abnormality detection means detects the conduction abnormality of the liquid-liquid heat exchanger. And when the continuity abnormality detecting means detects the continuity abnormality, by fully closing the hot water supply flow rate control valve provided downstream on the outlet side of the secondary side of the liquid-liquid heat exchanger for general hot water supply, Hot water mixed with a heating heat medium is prevented from being discharged from a hot water tap or the like.

  A hot water supply / heating heat source machine according to claim 2 of the present invention is the hot water supply / heating heat source machine according to claim 1, wherein the liquid level in the reserve tank is set at a predetermined height position of the reserve tank when the heating heat medium is replenished. And a discharge pipe for discharging the heat medium exceeding the liquid level restriction by the drain to the outside of the housing is connected to the liquid level restriction drain. The discharge pipe is provided with a pipe opening / closing means for switching between closing and opening of the pipe.

  That is, in this type of hot water heating / heating source, when the heating medium decreases due to evaporation or the like, the reserve tank is replenished with the heating medium, but as described above, the liquid-liquid heat exchanger In the configuration that detects the continuity abnormality based on the liquid level in the reserve tank, if the heating heat medium is put too much into the reserve tank when replenishing the heating heat medium, the liquid-liquid heat exchanger causes the continuity abnormality. Even in such a state, the liquid level detection electrode detects the liquid level. Therefore, according to the second aspect of the present invention, a liquid level limiting drain for limiting the liquid level is provided at a predetermined height position of the reserve tank, and a pipe line is opened and closed in a discharge pipe connected to the liquid level limiting drain. By providing the means, at the time of replenishing the heating heat medium, it is possible to prevent the heating heat medium from being replenished beyond the level of the liquid level restricted drainage by simply opening the pipe opening / closing means, and as a result Thus, erroneous detection by the continuity abnormality detecting means can be eliminated.

  A hot water supply / heating heat source machine according to claim 3 of the present invention is the hot water supply / heating heat source machine according to claim 2, wherein the liquid level restriction drainage port is located at a height position due to expansion of the heating heat medium during heating operation. The position detection electrode is set at a position where the liquid level is not detected.

  That is, in this type of hot water supply / heating heat source machine, the heating heat medium thermally expands during heating operation, and accordingly, the liquid level in the reserve tank also rises. In the invention of claim 3, the height position of the liquid level limiting drainage port is set to a position where the liquid level detection electrode does not detect the liquid level by expansion of the heating heat medium by heating operation, thereby accompanying thermal expansion. Prevention of erroneous detection by the continuity abnormality detection means is achieved.

  A hot water supply / heating heat source device according to claim 4 of the present invention is the hot water supply / heating heat source device according to any one of claims 1 to 3, wherein the reserve tank of the heating heat medium tank is for replenishing the heating heat medium. A sealing plug is provided with a heating medium replenishing port and a drain port for discharging the heating medium in the reserve tank, and is a sealing plug for switching the heating circulation circuit to a sealing type at the mounting portion of the pressure regulating valve of the heating heating medium tank. Equipped with a pressure relief valve, and the outlet side of the pressure relief valve is connected to the heat medium replenishing port or drainage port of the reserve tank by piping so that the conduction abnormality detection means can detect the conduction abnormality It is characterized by being configured.

  That is, the hot water supply / heating heat source machine of the present invention includes a mounting portion for mounting the pressure regulating valve on the heating heat medium tank. By mounting a sealing plug on the mounting portion, the hot water circulation circuit is half-finished. It can be switched from a sealed type to a sealed type. In the invention of claim 4, a general hot water supply is used by using a sealing plug having a pressure relief valve as the sealing plug and connecting the outlet side of the pressure relief valve to the heat medium replenishing port or the drain port of the reserve tank. The liquid level of the reserve tank is raised when the primary side and the secondary side of the liquid-liquid heat exchanger for use have an abnormality in continuity, whereby the continuity abnormality detection means using the liquid level detection electrode is used. It enables detection of continuity abnormality.

As described above, according to the hot water supply / heating heat source device of claim 1 of the present invention, the reserve tank is provided with the liquid level detection electrode of the heating heat medium, and the liquid for general hot water supply is based on the detection state of the liquid level detection electrode. -Since the continuity abnormality detection means for detecting the continuity abnormality between the primary side and the secondary side in the liquid heat exchanger is provided, when the continuity abnormality between the primary side and the secondary side occurs in the liquid-liquid heat exchanger Can quickly detect the occurrence of the abnormality.
When the continuity abnormality detecting means detects a continuity abnormality, the control configuration is to fully close the hot water supply flow rate control valve provided downstream of the outlet side of the secondary side in the liquid-liquid heat exchanger for general hot water supply. By adopting, the hot water mixed with the heating heat medium is not discharged from a hot water tap or the like, and a safe hot water heating / heating source can be provided.

  In addition, according to the hot water supply heating heat source machine of claim 2, since the liquid level restriction drainage port capable of opening the pipe line at the time of replenishment of the heating heat medium is provided at a predetermined height position of the reserve tank, Since the medium is not replenished beyond the height of the liquid level limiting drain, erroneous detection of the conduction abnormality by the conduction abnormality detecting means can be eliminated.

  Furthermore, according to the hot water supply heating heat source machine of claim 3, the height position of the liquid level restriction drainage port is set to a position where the liquid level detection electrode does not detect the liquid level due to thermal expansion of the heating heat medium due to heating operation. This prevents the conduction abnormality from being detected (false detection) due to the thermal expansion of the heat medium during the heating operation, so that the conduction abnormality can be detected more accurately.

  According to a fourth aspect of the present invention, there is provided a hot water supply / heating heat source device using a hermetic plug provided with a pressure relief valve for the hermetic plug for switching the heating circulation circuit to a hermetic type, and the outlet side of the pressure relief valve is replenished with a heat medium in the reserve tank. By connecting the pipe to the outlet or the drain, the above-described continuity abnormality can be detected even when the hot water supply / heating heat source machine is used as a hermetically sealed type.

Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a hot water supply system using a hot water supply / heating heat source device according to the present invention as a heat source, and FIG. 2 is an external view of the hot water supply / heating heat source device. Moreover, FIG. 3 is an assembly drawing which shows the example of arrangement | positioning of the main components of the hot-water supply heating heat source machine.

  The hot water supply / heating heat source unit 1 of the present invention supplies a heat medium (for example, antifreeze) heated by a heating means to a heating device such as a fan convector or a floor heating panel as a heating heat medium, as well as a curan or shower. A heat source device used as a heat source for heating hot water (general hot water) supplied to various hot water taps, and a hot water supply / heating heat source device 1 shown in the present embodiment is used for a heating circulation circuit A for heating and a bath reheating bath. A recirculation circuit B and a hot water supply circulation circuit C for general hot water supply are provided.

  Specifically, as shown in FIG. 1, the hot water supply / heating heat source machine 1 includes a combustion can body 2 that uses oil such as kerosene as fuel as heating means. The combustion can body 2 includes a combustion chamber 3 for burning fuel in the can case 2a, and heat for heating and heating the heating medium using the heat of the flame and combustion gas generated in the combustion chamber 3. The main part is provided with an exchanger unit 4 and an exhaust cylinder 5 for discharging combustion gas to the outside of the combustion can body 2.

  The combustion chamber 3 is a substantially cylindrical space provided in the lower part of the combustion can body 2, and a fuel injection nozzle 6 and an ignition electrode rod 7 are provided facing the combustion chamber 3. A blower fan 8 for sending combustion air into the combustion chamber 3 is provided. Then, the fuel in the combustion chamber 3 is ignited by applying a voltage to the electrode rod 7 while injecting and supplying the fuel from the fuel injection nozzle 6 into the combustion chamber 3. Combustion in the combustion chamber 3 is maintained by feeding the working air.

  The heat exchanger unit 4 is heated by the gas-liquid heat exchanger that heats and raises the temperature of the heat medium using the heat of the combustion gas generated in the combustion chamber 3 and the gas-liquid heat exchanger. And a liquid-liquid heat exchanger that performs bath retreat using a heat medium.

  Specifically, the heat exchanger section 4 includes a large-capacity heat medium storage section 9 that stores the heat medium on the outer periphery and above the combustion chamber 3 as the gas-liquid heat exchanger. The heat medium stored in the heat medium storage unit 9 by combustion in the combustion chamber 3 is configured to be heated and heated. More specifically, a passage 91 for the combustion gas is formed in the heat medium storage portion 9 in the vertical direction from the combustion chamber 3, and the heat medium is stored in the process in which the combustion gas passes through the passage 91 to the exhaust pipe 5. Heat exchange with the heat medium in the section 9 is performed. In the figure, reference numeral 92 denotes a temperature sensor (hot water storage body thermistor) that detects the temperature of the heat medium in the heat medium storage unit 9.

  On the other hand, the liquid-liquid heat exchanger of the heat exchanger unit 4 is a coil-type heat exchanger provided in a heat medium storage unit 9 formed above the combustion chamber 3, and one end of the coil 10. Is connected to the return pipe 11 and the other end is connected to the return pipe 12. That is, the liquid-liquid heat exchanger is configured to heat and heat the bath water in the coil 10 using the heat of the heat medium stored in the heat medium storage unit 9.

  The heating circuit A supplies the heating medium heated and heated in the heating medium storage unit 9 of the heat exchanger unit 4 to a heating appliance (not shown), and heats the heating medium radiated by the heating appliance again. This is a circulation circuit for returning to the exchanger unit 4 to raise the temperature of heating, and in the illustrated example, a heat medium having a relatively high temperature (for example, about 80 ° C.) such as a bathroom dryer or a fan convector is required. Both heating appliances (hereinafter referred to as high temperature terminals) and heating appliances (hereinafter referred to as low temperature terminals) that require a relatively low temperature (for example, about 30 ° C. to 40 ° C.) heating medium such as floor heating panels. It is comprised so that a heat medium can be supplied to.

  That is, the heating circulation circuit A1 for the high-temperature terminal is supplied from the heating forward pipe 13 (specifically, the heating forward connection port 110 provided at the tip thereof) connected to the upper part of the heat medium storage unit 9 to the hot water supply / heating heat source. The heating medium is sent to a high temperature terminal outside the housing of the machine 1, and the heat medium radiated by the heat exchanger (not shown) of the high temperature terminal is used as a heating return pipe 14 (specifically, heating) It is configured to return to the return connection 111).

  Here, the connecting port 110 for heating and returning and the connecting port 111 for heating return are fittings for connecting pipes attached to the side surface of the casing 101 of the hot water supply / heating heat source unit 1 as shown in FIGS. In addition, a pipe (not shown) to the high temperature terminal is connected to each of the connection ports 110 and 111.

  And this heating return piping 14 is connected with the heating heating-medium tank 15 which stores a heating-heating medium. A pipe 16 for returning the heating medium returned to the heating heating medium tank 15 to the heating medium storage unit 9 and supplying the heating medium to the low temperature terminal is connected to the lower part of the heating heating medium tank 15. A heating circulation pump 19 for forcibly circulating the heat medium in the heating circuit A is provided in the pipe 16. And the front-end | tip of this piping 16 is branched, One comprises the heat-medium return piping 17 connected to the lower part of the said heat-medium storage part 9, and the other comprises the heating low temperature going-out piping 18 mentioned later.

  In summary, in the heating circuit A1 for the high temperature terminal, the heat medium heated and heated in the heat medium storage unit 9 is heated from the upper part of the heat medium storage unit 9 to the heating forward pipe 13, the high temperature terminal, the heating return pipe 14, and the heating. The heat medium tank 15 and the heat medium return pipe 17 are circulated to the lower part of the heat medium storage unit 9.

  On the other hand, the heating circuit A2 for the low temperature terminal is connected to the casing of the hot water supply / heating heat source unit 1 from the heating / low temperature forward pipe 18 (specifically, the heating / low temperature connection port 112 provided at the tip of the heating / low temperature forward pipe 18). The heat medium is sent to a low temperature terminal outside the body 101, and the heat medium returning through the low temperature terminal returns to the heating return pipe 14 (the heating return connection port 111). Here, the heating / low temperature connection port 112 is also provided on the side surface of the housing 101 in the same manner as the heating connection port 110 described above (see FIGS. 2 and 3).

  In the present embodiment, the heating heat medium tank 15 is configured as a so-called semi-enclosed heat medium tank provided with a reserve tank 20. Specifically, the heating heat medium tank 15 includes a mounting portion 22 for mounting the pressure regulating valve 21 in a detachable manner on the upper portion thereof. And in this embodiment, the radiator cap provided with the pressurization valve and the negative pressure valve is used as this pressure control valve 21, and the said mounting part 22 has the structure which can attach or detach this radiator cap in connection with this. Has been.

  The heating heat medium tank 15 is provided with such a pressure adjusting valve 21 so that when the pressure in the heating heat medium tank 15 exceeds a predetermined pressure, the pressurizing valve is operated to heat the heat in the heating heat medium tank 15. The medium is sent into the reserve tank 20 through the escape pipe 23 communicating with the reserve tank 20, and conversely, when the pressure in the heating heat medium tank 15 decreases and the inside of the tank becomes negative pressure, the negative pressure valve is activated, A heat medium is supplied from the reserve tank 20 to the heating heat medium tank 15 through the escape pipe 23.

  The heating heat medium tank 15 is arranged at the upper part of the hot water supply / heating heat source unit 1 in association with the configuration of the pressure adjusting valve 21 so as to be detachable. Specifically, the radiator cap is disposed by opening the opening / closing lid 102 so that the mounting portion 22 faces the opening / closing lid 102 (see FIGS. 2 and 3) provided on the upper surface of the hot water supply / heating heat source unit 1. It is comprised so that attachment / detachment work of can be performed easily.

  The heating heat medium tank 15 is connected to a bypass pipe 36 for adjusting the temperature of the heat medium in the tank. The bypass pipe 36 can supply a high-temperature heat medium directly to the heating heat medium tank 15 from the heat exchanger section 4 (specifically, the upper part of the heat medium storage section 9) without going through the heating appliance. The bypass pipe 36 is provided with a bypass flow rate control valve 37 for controlling the flow rate in the pipe. In the figure, reference numeral 38 denotes a water level detecting device for detecting a drop in the liquid level in the heating / heating medium tank 15.

  As shown in FIG. 4, the reserve tank 20 is composed of a box-shaped resin tank having a substantially rectangular shape in any of a plan view, a front view, and a side view, and a relief for connecting the relief pipe 23 to the upper surface. A pipe connection port 25 and a heat medium replenishment port 26 for replenishing the heat medium are opened through the tank. As shown in FIGS. 2 and 3, the reserve tank 20 is disposed below the heating heat medium tank 15. Therefore, an opening 27a for replenishing the heat medium to the reserve tank 20 is opened at a position facing the opening / closing lid 102, and a heat medium replenishment pipe connecting the opening 27a and the heat medium replenishing port 26 is provided. 27 is disposed.

  Further, on the side surface of the reserve tank 20, there is a drain port 28 used for extracting the heat medium in the reserve tank 20 during maintenance and the like, and overflow drainage for discharging excess heat medium when the reserve tank 20 overflows. The outlet 29 is provided so as to protrude, and when the reserve tank 20 is installed at a predetermined position, the drain outlets 28 and 29 are exposed to the outside of the casing of the hot water supply heat source unit 1 ( (See FIGS. 2 and 3). The drain port 28 is opened only when the heat medium is discharged from the tank 20, and is closed in other cases (normal time).

  In the present embodiment, a third drainage port (liquid level restriction drainage port) 30 is further provided at a predetermined height position on the back surface of the reserve tank 20. The third drainage port 30 is a drainage port provided to limit the liquid level in the reserve tank 20 when the heating medium is replenished, and the height position of the third draining port 30 is the height of the heating medium during the heating operation. Even if the liquid level in the tank rises due to thermal expansion, a liquid level detection electrode 35 described later is set to a height position at which the liquid level of the heat medium is not detected.

  The drain 30 is connected to a drain pipe 31 for discharging the heat medium exceeding the liquid level restriction by the drain 30 to the outside of the casing 101 of the hot water supply / heating heat source unit 1. An open / close plug 32 as a pipe opening / closing means for switching between closing / opening of the pipe of the drain pipe 31 is detachably attached to the tip of the pipe. The drain pipe 31 is made of a flexible material such as rubber, and is disposed so that the tip of the drain pipe 31 protrudes downward from the drain port 30 toward the side surface of the housing 101.

  That is, in the drain pipe 31, when the opening / closing plug 32 is opened, the heat medium exceeding the liquid level restriction by the drain port 30 is naturally discharged to the outside of the housing 101 through the drain pipe 31. It is provided as follows. The open / close plug 32 of the drain pipe 31 is manually opened (opened) when the heating medium is replenished, and is closed (closed) in other cases (normal time).

  Thus, by providing the third drain port 30 in the reserve tank 20, when the heating medium is replenished, the open / close plug 32, which is a pipe opening / closing means, is opened to open the drain pipe 31. In this state, if the heating medium is replenished from the opening 27a for replenishing the heating medium, the heating medium replenished beyond the limit due to the liquid level restriction by the liquid level restriction drain port 30 is discharged from the drain port 30 to the drain pipe 31. It is naturally discharged to the outside through the housing. Therefore, when replenishing the heat medium, the worker can avoid replenishing the heat medium excessively without visually checking the liquid level of the heat medium through the liquid level monitoring window 103 provided on the front surface of the housing.

  In particular, in this embodiment, as will be described later, this embodiment employs a configuration for detecting a conduction abnormality of a liquid-liquid heat exchanger for general hot water supply using a liquid level detection electrode 35 provided in the reserve tank 20. In connection with this, there is an advantage that erroneous detection of abnormal conduction due to excessive heating medium can be easily and reliably prevented.

  And the reserve tank 20 comprised in this way is provided with the liquid level detection electrode 35 for detecting the conduction abnormality of the liquid-liquid heat exchanger for the general hot water supply mentioned later (refer FIG. 1). The liquid level detection electrode 35 is provided for detecting an abnormal liquid level rise in the reserve tank 20 (more specifically, an abnormal liquid level rise exceeding the liquid level rise due to thermal expansion during heating operation). An electrode rod for detecting the liquid level is arranged vertically in the tank. When the liquid level of the heat medium in the reserve tank 20 rises due to an abnormal liquid level rise and comes into contact with the tip of the electrode 35, the detection signal is transmitted to the control means 100 described later.

  The recirculation circuit B is a circulation circuit for heating hot water in a bathtub (not shown) (hereinafter referred to as bathtub water), and as described above, the coil 10 disposed in the heat medium storage unit 9 and The main part is composed of a bath pipe 11 connected to the coil 10, a bath return pipe 12, and a circulation pump 39 for forcibly circulating bath water.

  Specifically, the bath water heated and heated by the coil 10 is guided to the outside of the casing of the hot water supply / heating heat source unit 1 through the bath piping 11 (the bath connection port 113), and is placed on the inner surface of the bath. It discharges in the bathtub from the provided circulation adapter (not shown). On the other hand, bath water is also sucked in via the circulation adapter. That is, the above-described return return pipe 12 (specifically, the return return connection port 114) is also connected to the circulation adapter, and the recirculation pump 39 for replenishment is sequentially provided on the return return pipe 12 from the upstream side in the flow direction. A water flow switch 40 and a bath temperature sensor 41 are provided.

  In the figure, reference numeral 42 indicates a three-way valve connected to the bypass pipe 43. In the three-way valve 42, the port on the heat exchanger section 4 side and the port on the circulation pump 39 side are in communication with each other when the bath is replenished. On the other hand, when the hot water is dropped into the bathtub, the port on the bypass pipe 43 side and the port on the circulation pump 39 side are in communication with each other, the hot water heated by the plate heat exchanger 45 is dropped, and the flow pipe 11 passes through the circuit 58. And the return pipe 12 can be supplied to the bathtub at the same time. It should be noted that the forward connection port 113 and the return connection port 114 are also provided on the side surface of the housing 101 in the same manner as the heating connection port 110 described above (see FIGS. 2 and 3).

  Thus, the recirculation circuit B is configured as described above, and when the bath is refueled, the flow path of the three-way valve 42 is set to the heat exchanger section 4 side, and the circulation pump 39 is driven. Bath water heated and heated by the coil 10 is supplied to the bathtub through the forward piping 11, and bathtub water from the bathtub is circulated to the coil 10 again through the return piping 12.

  Next, the hot water supply circulation circuit C will be described. The hot water supply circulation circuit C circulates a part of the heating heat medium heated by the heat exchanger section 4 to the primary side of the liquid-liquid heat exchanger for general hot water supply, and uses the supply water pressure on the secondary side. It is a circulation circuit for heating the applied tap water and performing an instantaneous general hot water supply.

  Specifically, the hot water supply circulation circuit C takes out the plate heat exchanger 45 as a liquid-liquid heat exchanger for general hot water supply and the plate heat by taking out a high-temperature heat medium from the upper part of the heat medium reservoir 9. The hot water supply piping 46 to be supplied to the primary side of the exchanger 45, the hot water return piping 47 for returning the heat medium radiated by the plate heat exchanger 45 to the lower part of the heat medium storage section 9, and the heat medium between them. The main part is a circulation pump 48 for hot water supply for forced circulation.

  And at the time of general hot water supply, the circulating pump 48 is driven to supply the high-temperature heat medium at the top of the heat medium reservoir 9 to the primary side of the plate heat exchanger 45, and the water flowing on the secondary side is supplied. It is used as a heat source for heating.

  Here, in the hot water supply heating heat source machine 1 shown in the present embodiment, as described above, a configuration in which a part of the heating heat medium is extracted from the heat medium storage unit 9 as the heat source of the plate heat exchanger 45 is employed. Therefore, as shown in FIG. 3, the plate heat exchanger 45 is installed so as to be positioned below the combustion can body 2 (specifically, the heat medium storage unit 9).

  That is, in the structure of the heat exchanger section 4 shown in the present embodiment, if the plate heat exchanger 45 is disposed above or at the same height as the combustion can body 2, the heating operation is performed even when general hot water supply is not performed. Then, since the heating medium in the heating medium storage unit 9 is heated and heated, the heat is transferred to the plate heat exchanger 45 and heats the secondary water. Therefore, in this embodiment, the plate heat exchanger 45 is positioned below the combustion can body 2 as a structure for preventing the temperature rise of the plate heat exchanger 45 due to such heat conduction.

  On the other hand, a hot water supply circuit for general hot water supply is connected to the secondary side of the plate heat exchanger 45. Specifically, a water supply pipe 50 connected to a water supply source such as city water is connected to one end on the secondary side of the plate heat exchanger 45 through a water supply connection port 115, and to the other end. The hot water supply pipe 51 is connected to the hot water supplied from the water supply pipe 50 by using the water supply pressure, and is heated and heated when passing through the secondary side of the plate heat exchanger 45.

  The hot water supply system shown in FIG. 1 is configured to use the clean water heated and heated by the plate heat exchanger 45 in this manner for discharging hot water from a hot water tap and dropping it into a bathtub. Specifically, the outlet pipe 51 is connected to a hot water mixing valve 52 and mixed with normal temperature (unheated) clean water supplied through a branch pipe 53 branched from the water supply pipe 50 in the hot water mixing valve 52 to supply hot water. Generate hot water at the set temperature.

  And the hot water produced | generated in this way is distributed through the piping 54 connected to the exit side of the hot-water mixing valve 52 for the supply to a hot-water tap, and the use for dropping into a bathtub. That is, the pipe 54 is branched into a hot water supply pipe 55 connected to a hot water supply connection port 116 for connecting a hot water tap, and a dropping pipe 56 connected to a dropping circuit 58 to the bathtub.

  The pre-branch pipe 54 is provided with a flow rate control valve (hot water supply flow rate control valve) 60, and the amount of hot water generated by the hot water / mixing valve 52 is controlled by the flow rate control valve 60. 100 is controllable. The flow rate control valve 60 is configured to shut off the supply of hot water to the hot water supply pipe 55 and the dropping pipe 56 by closing the valve (making it fully closed).

  The drop-in circuit 58 into the bathtub is provided with a pouring flow sensor 61, a pouring solenoid valve 62, and a check valve 63, and the tip thereof is configured to merge with the upstream side of the return pipe 12. As described above, when the port on the bypass piping 43 side of the three-way valve 42 and the port on the circulation pump 39 side are in communication with each other, the hot water heated by the plate heat exchanger 45 is heated by opening the hot water solenoid valve 62. Supplied to the bathtub.

  In the figure, reference numeral 65 denotes a can body thermistor for detecting the temperature of hot water discharged from the plate heat exchanger 45, reference numeral 66 denotes a water temperature sensor for detecting the temperature of clean water entering the water supply pipe 50, and reference numeral 67 denotes a hot water tap. The hot water thermistor which detects the hot water temperature of the hot water is shown, and the reference numeral 68 indicates the incoming water flow rate sensor which detects the incoming water flow rate to the water supply pipe 50.

  Thus, in the hot water supply / heating heat source machine 1 configured as described above, the operation of each part of the hot water supply / heating heat source machine 1 is controlled by the control means 100, and the functions of hot water supply, heating, and bathing are realized.

  Here, the control means 100 is a control device that controls the operation of each part of the hot water supply / heating heat source machine 1, and includes a microcomputer in which these control programs are installed. And in each control of these hot water supply, heating, and bathing, hot water supply based on operation information (for example, operation information of hot water supply set temperature) from an operation unit (remote controller) not shown and sensor detection information from various sensors Each part of the heating heat source machine 1 is controlled.

  In the hot water supply / heating heat source unit 1 shown in the present embodiment, the control means 100 performs the primary side and the secondary side in the plate heat exchanger 45 in addition to the general control such as hot water supply, heating, and bathing. There is provided a program functioning as a conduction abnormality detecting means for detecting a conduction abnormality on the side and a safe operation command means for performing a predetermined safe operation when the conduction abnormality is detected.

  That is, as the continuity abnormality detection means, the control means 100 detects the continuity abnormality between the primary side and the secondary side of the plate heat exchanger 45 based on the detection state of the liquid level detection electrode 35 provided in the reserve tank 20. To detect.

  Specifically, when the plate heat exchanger 45 is cracked and the primary side and the secondary side of the heat exchanger 45 become conductive (short-circuited), the pressure on the primary side increases, and as a result, the reserve tank 20 The liquid level inside rises. The continuity abnormality detecting means detects this increase in liquid level with a liquid level detection electrode 35 provided in the reserve tank 20, and determines that there is a continuity abnormality if there is an increase in the liquid level, and notifies that effect to the outside through a remote controller or the like. Notify (for example, display on the display unit) and order execution of safe operation.

  As a safe operation here, in this embodiment, the control which fully closes the flow control valve 60 provided downstream of the outlet side of the secondary side of the plate heat exchanger 45 is performed. Thereby, the hot water supply to the hot water supply pipe 55 and the dropping pipe 56 is shut off, and hot water mixed with a heat medium is prevented from flowing out from the hot water supply tap or the circulation adapter of the bathtub.

  Thus, according to the present invention, in the hot water supply / heating heat source unit 1 including the semi-enclosed heating / heating medium tank 15, the reserve tank 20 is provided with the liquid level detection electrode 35 for detecting an increase in the liquid level in the tank, Based on the detection result of the electrode 35, the control means 100 detects the conduction abnormality of the plate heat exchanger 45 for general hot water supply and performs a safe operation. Therefore, even if the plate heat exchanger 45 has a conduction abnormality, Hot water mixed with a heat medium is not discharged from a hot water tap, etc., and a safe hot water supply system can be provided.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIGS. The embodiment shown in FIGS. 5 and 6 shows a case where the hot water supply / heating heat source machine 1 shown in the first embodiment is equipped with a hermetic plug for switching the heating circulation circuit from a semi-hermetic type to a hermetic type. Therefore, since the structure other than the sealing plug 70 is the same as that of the first embodiment described above, the parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.

  The hermetic plug 70 is a plug for switching the heating circulation circuit from a semi-hermetic type to a hermetic type, and this plug 70 is replaced by the heating heat medium tank 15 instead of the pressure regulating valve 21 attached to the heating heat medium tank 15. It is attached to. That is, the sealing plug 70 has a structure that can be mounted on the mounting portion 22 of the heating heat medium tank 15.

  The hermetic plug 70 is provided with a pressure relief valve (safety valve) 71. When the inside of the heating heat medium tank 15 exceeds a predetermined pressure, the pressure relief valve 71 is operated, and the inside of the heating heat medium tank 15 is provided. The heat medium is configured to be guided to a pipe 72 connected to the outlet side of the pressure relief valve 71.

  In this embodiment, when the hot water supply / heating heat source unit 1 is used as a sealed type using the sealed plug 70, the pipe 72 provided in the pressure relief valve 71 is connected to the reserve tank 20. That is, when the pressure relief valve 71 is operated, the heat medium in the heating heat medium tank 15 is connected so as to be guided into the reserve tank 20.

  FIG. 5 shows a configuration in which the pipe 72 is connected to the third drain port (liquid level limited drain port) 30 of the reserve tank 20, that is, the open / close stopper 32 of the water pipe 31 communicating with the drain port 30 is removed. 6 shows a case where the pipe 72 is connected, and FIG. 6 shows a configuration in which the pipe 72 is connected to the heat medium replenishing port 26 of the reserve tank 20 with the open / close plug 32 closed, that is, the pipe 72 is heated. The case where it mounts in the opening part 27a for medium replenishment is shown.

    In this way, by connecting the outlet side of the pressure relief valve 71 and the reserve tank 20, even when the hot water supply / heating heat source unit 1 is used as a hermetically sealed type, the plate heat exchanger 45 can be The conduction abnormality can be detected by the control means 100, and when a conduction abnormality is detected, the same safe operation can be performed.

  In addition, embodiment mentioned above shows the preferred embodiment of this invention, Comprising: This invention is not limited to these, A various design change is possible within the range.

  For example, in the above-described embodiment, the case where oil such as kerosene is used as the fuel is shown. However, the present invention uses a part of the heating heat medium as the heat source of the liquid-liquid heat exchanger for general hot water supply. If it is a machine, it is possible to apply also to what uses gas as a fuel, and uses an electric heater as a heat source.

  In the above-described embodiment, the case where the open / close plug 32 that manually switches between closing / opening of the pipe line is used as the pipe line opening / closing means provided in the liquid level restriction drain port 30 of the reserve tank 20. The path opening / closing means may be in the form of an electromagnetic valve that can be remotely operated by an operation unit, for example, as long as it can switch between closing and opening of the pipe line.

  In the above-described second embodiment, the case where the pipe 72 connected to the pressure relief valve 71 of the hermetic plug 70 is connected to the liquid level limiting drain 30 or the heating medium replenishment port 26 of the reserve tank 20 is shown. 72 and the reserve tank 20 should just be connected, and the piping 72 can also be connected to another drain outlet (for example, drain outlet 28).

It is a schematic block diagram of the hot water supply heating heat source machine concerning this invention. It is a figure which shows the external appearance of the hot-water supply heating heat source machine, FIG. 2 (a) has shown the top view of the hot-water supply heating-heat source machine, and FIG.2 (b) has shown the front view. It is an assembly drawing which shows the example of arrangement | positioning of the main components of the hot-water supply heating heat source machine. It is explanatory drawing which shows the structure of the reserve tank of the hot-water supply heating heat source machine, FIG.4 (a) is a top view of a reserve tank, FIG.4 (b) is a front view of the reserve tank, FIG.4 (c) is FIG. Each side of the reserve tank is shown. It is the front view which showed the example of mounting | wearing with the airtight plug to the hot-water supply heating heat source machine. It is the front view which showed the other attachment example of the sealing plug to the hot-water supply heating heat source machine.

Explanation of symbols

1 Hot water heater / heat source machine 2 Combustion can (heating means)
3 Combustion chamber 4 Heat exchanger 9 Heat medium storage
20 Reserve tank 21 Pressure regulating valve 26 Heat medium replenishment port 30 Liquid level restriction drain port 32 Opening / closing stopper (pipe opening / closing means)
35 Liquid level detection electrode 45 Plate heat exchanger for general hot water supply (liquid-liquid heat exchanger)
70 Sealing plug 71 Pressure relief valve 100 Control means (conducting abnormality detecting means)
A Heating circuit B Reheating circuit C Hot water circuit

Claims (4)

The heating heat medium tank provided in the heating circulation circuit has a pressure adjusting valve mounting portion, and the pressure adjusting valve is detachably mounted to the mounting portion, and the pressure adjusting valve communicates with the reserve tank. In heating heat source machine,
A part of the heating heat medium heated by the heating means is circulated to the primary side of the liquid-liquid heat exchanger, and the hot water applied using the feed water pressure is heated on the secondary side to supply instantaneous general hot water. A circulation circuit for hot water supply is provided,
The reserve tank is provided with a liquid level detection electrode of a heating heat medium, and a conduction abnormality for detecting a conduction abnormality between a primary side and a secondary side in the liquid-liquid heat exchanger based on a detection state of the liquid level detection electrode Provided with detection means ,
A hot water supply flow rate control valve is provided downstream of the outlet side of the secondary side of the liquid-liquid heat exchanger, and when a continuity abnormality is detected by the continuity abnormality detection means, the hot water flow rate control valve is fully closed. A hot water supply / heating heat source machine, characterized by comprising a control configuration to perform . A liquid level limiting drain for limiting the liquid level in the reserve tank at the time of replenishment of the heating heat medium is provided at a predetermined height position of the reserve tank,
A discharge pipe for discharging the heat medium exceeding the liquid level restriction by the drain outlet to the outside of the housing is connected to the liquid level restricted drain outlet, and the pipe pipe is switched between closed and opened. The hot water heating / heating source according to claim 1, further comprising a pipe opening / closing means.   The height position of the liquid level limiting drainage port is set to a position where the liquid level detection electrode does not detect the liquid level due to expansion of the heating heat medium due to heating operation. Hot water heater / heat source machine. A reserve tank of the heating heat medium tank includes a heat medium replenishing port for replenishing the heating heat medium, and a drain port for discharging the heat medium in the reserve tank,
A mounting part of the pressure adjusting valve of the heating heat medium tank is mounted with a sealing plug that switches the heating circulation circuit to a sealing type and includes a pressure relief valve,
2. The outlet side of the pressure relief valve and a heat medium replenishing port or a drain port of the reserve tank are connected by piping so that a conduction abnormality can be detected by the conduction abnormality detecting means. The hot water supply / heating heat source machine according to any one of items 1 to 3.

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